CN107770824A - Method for cell handover, user equipment and network equipment - Google Patents

Abstract

An embodiment of the present invention provides a method for cell switching, including: the first network device sends the DCID and the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device uses the DCID and the uplink reference signal The time-frequency resource configuration is sent to the UE. The UE may send the uplink reference signal according to the DCID and the time-frequency resource configuration of the uplink reference signal. Further, the first network device sends a handover instruction message to the second network device, where the handover instruction message includes the identifier of the second node in the first network where the first network device is located. And the second network device sends a handover command to the UE to instruct the UE to perform data transmission with the second node. The method in the embodiment of the present invention enables the UE to switch between two network systems, ensures service continuity, improves switching efficiency, and thus ensures transmission quality.

Description

Method for cell handover, user equipment and network equipment

technical field

Embodiments of the present invention relate to the communication field, and more specifically, relate to a method for cell handover, user equipment and network equipment.

Background technique

In the prior art, in order to ensure service continuity of a user equipment (User Equipment, UE), it is necessary to perform mobility management on the UE. For example, when the UE moves from the coverage area of the source cell to the coverage area of the target cell, it needs to complete the handover between cells in time.

In existing communication systems, the design ideas of mobility management are all network-centric design ideas (UE follows network). Taking an active UE as an example, in order to implement mobility management of the UE, each cell in the network will send a downlink reference signal for the UE to measure. The UE will report the measurement result to the network side in the form of a measurement report, and the network will make a handover decision based on the UE's measurement report, and handover the UE to a cell with good signal conditions for data transmission.

However, in the subsequent evolution of the mobile communication system, in order to meet the huge amount of data communication needs, a large number of small cells may be deployed in hot spots. If the network-centric design idea is continued, the This causes a problem that the mobility management of the UE is difficult. Therefore, in the subsequent evolution process, a user-centric wireless access (UE Centric No Cell, UCNC) mobility mechanism is proposed.

When a UE moves between a network-centric system and a user-centric system, how to implement handover becomes a technical bottleneck.

Contents of the invention

Embodiments of the present invention provide a method for cell handover, user equipment and network equipment, which can solve UE handover between a network-centric system and a user-centric system.

In a first aspect, a method for cell handover is provided, including:

The first network device sends a dedicated connection identifier (DCID) to a second network device in the current serving cell of the user equipment UE, so that the second network device forwards the DCID to the UE, where the DCID is used for the second network device a network device identifies the UE;

The first network device sends the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device forwards the time-frequency resource configuration of the uplink reference signal to the UE;

The first network device sends a handover instruction message to the second network device, where the handover instruction message includes an identifier of a second node in the first network where the first network device is located, so that the UE and the The second node performs data transmission.

It can be seen that the first network device in the embodiment of the present invention can send the DCID and the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device can instruct the UE to send the uplink reference signal. Further, the first network device may instruct the UE to use the first network device as a serving cell through a handover instruction message, and perform data communication with a node on the first network side, so that the handover from the second network device to the first network device can be completed , ensuring service continuity of the UE.

With reference to the first aspect, in some possible implementation manners of the first aspect, before the first network device sends the handover indication message to the second network device, the method further includes:

The first network device sends a measurement indication message to the first node, instructing the first node to measure the uplink reference signal sent by the UE, where the measurement indication message carries the DCID and/or the uplink reference signal Time-frequency resource allocation;

The first network device receives a first measurement report sent by the first node, where the first measurement report carries a measurement result of the uplink reference signal sent by the UE;

The first network device allocates the second node to the UE according to the first measurement report of the first node.

With reference to the first aspect, in some possible implementation manners of the first aspect, the first network device assigning the second node to the UE according to the first measurement report of the first node includes:

The first network device judges whether the measurement result carried in the first measurement report of the first node meets a handover threshold;

If the measurement result carried in the first measurement report of the first node satisfies the handover threshold, the first network device allocates the second node to the UE.

With reference to the first aspect, in some possible implementation manners of the first aspect, the first network device judging whether the measurement result carried in the first measurement report of the first node meets a handover threshold includes:

The first network device judges whether the measurement result carried in the first measurement report of the first node within a preset time period satisfies the handover threshold.

With reference to the first aspect, in some possible implementation manners of the first aspect, before the first network device determines whether the measurement result carried in the first measurement report of the first node satisfies the handover threshold, the method further includes: :

The first network device receives the preset duration and/or switching threshold from the second network device.

With reference to the first aspect, in some possible implementation manners of the first aspect, before the first network device sends the DCID to the second network device in the current serving cell of the UE, the method further includes:

The first network device receives the measurement request sent by the second network device;

Wherein, the DCID and the time-frequency resource configuration of the uplink reference signal are included in a measurement response corresponding to the measurement request.

That is to say, the first network device may send a measurement response to the second network device, where the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal.

With reference to the first aspect, in some possible implementation manners of the first aspect, the handover indication message further includes:

Transmission resource information configured by the first network device for the UE, and/or a new ID allocated by the first network device for the UE.

With reference to the first aspect, in some possible implementation manners of the first aspect, before the first network device sends the handover indication message to the second network device, the method further includes:

The first network device sends a TA test instruction to the second network device, so that the second network device instructs the UE to send a TA test message;

The first network device receives the TA test message sent by the UE;

The first network device determines a TA value according to the TA test message;

The first network device sends the TA value to the UE.

With reference to the first aspect, in some possible implementation manners of the first aspect, the first network device sending the TA value to the UE includes:

The first network device sends the TA value to the second network device, so that the second network device forwards the TA value to the UE.

In a second aspect, a method for cell handover is provided, including:

The user equipment UE receives a first radio resource control RRC configuration message sent by a second network device of the current serving cell, where the first RRC configuration message includes a dedicated connection identifier DCID, and the DCID is used by the first network device to identify the UE;

The UE receives a second RRC configuration message sent by the second network device, where the second RRC configuration message includes a time-frequency resource configuration of an uplink reference signal;

The UE sends an uplink reference signal according to the first RRC configuration message and the second RRC configuration message;

The UE receives a handover command sent by the second network device, where the handover command includes an identifier of a second node allocated to the UE by the first network device;

The UE performs data transmission with the second node according to the handover command.

In this way, the UE in the embodiment of the present invention can send the uplink reference information based on the time-frequency resource configuration of the DCID and the uplink reference signal sent by the second network device, and then can complete the handover from the second network device to the first network device based on the handover command, ensuring business continuity.

With reference to the second aspect, in some possible implementations of the second aspect, before the UE receives the first RRC configuration message sent by the second network device of the current serving cell, the method further includes:

The UE within the service range of the second network device performs different system detection;

The UE generates a second measurement report according to the result of the different system detection, where the second measurement report includes the cell ID of the first network where the first network device is located;

The UE sends the second measurement report to the second network device.

With reference to the second aspect, in some possible implementation manners of the second aspect, the UE performs different system detection, including:

The UE performs the different system detection when the trigger condition is met; or,

The UE periodically performs the inter-system detection.

Wherein, the trigger condition may be: the signal quality of the second network device detected by the UE is lower than a preset threshold.

With reference to the second aspect, in some possible implementation manners of the second aspect, the UE performs different system detection, including:

The UE receives a measurement control message sent by the second network device;

The UE performs the inter-system measurement according to the measurement control message.

With reference to the second aspect, in some possible implementation manners of the second aspect, the UE performs different system detection, including:

The UE performs inter-system detection, and detects at least one of the primary synchronization signal PSS, the secondary synchronization signal SSS, the downlink reference signal of the first network, and the system information SI sent by the first node in the first network item.

With reference to the second aspect, in some possible implementations of the second aspect, before the UE sends an uplink reference signal according to the first RRC configuration message and the second RRC configuration message, the method further includes:

The UE sends a timing advance TA test message to the first network device;

The UE receives the TA value sent by the first network device.

Optionally, the TA value is included in the second RRC configuration message.

With reference to the second aspect, in some possible implementations of the second aspect, before the UE sends an uplink reference signal according to the first RRC configuration message and the second RRC configuration message, the method further includes:

The UE receives the TA value sent by the second network device.

With reference to the second aspect, in some possible implementation manners of the second aspect, the first RRC configuration message and the second RRC configuration message are the same message.

In a third aspect, a method for cell handover is provided, including:

The second network device receives the dedicated connection identifier DCID and the time-frequency resource configuration of the uplink reference signal sent by the first network device, where the DCID is used by the first network device to identify a user equipment UE;

The second network device sends a first radio resource control RRC configuration message to the UE, where the first RRC configuration message includes the DCID;

The second network device sends a second RRC configuration message to the UE, where the second RRC configuration message includes time-frequency resource configuration of an uplink reference signal, so that the UE according to the first RRC configuration message and the The second RRC configuration message sends the uplink reference signal.

It can be seen that, in the embodiment of the present invention, for a UE within the service range of the second network device, the second network device can assist in completing the handover from the second network device to the first network device, and service continuity of the UE can be included.

In combination with the third aspect, some possible implementations of the third aspect also include:

The second network device determines according to the first timing advance TA value between the second network device and the UE and the second TA value between the second network device and the first network device a third TA value between the UE and the first network device;

The second network device sends the determined third TA value to the UE.

In combination with the third aspect, some possible implementations of the third aspect also include:

The second network device receives the TA value sent by the first network device;

The second network device sends the TA value to the UE.

Optionally, the TA value is included in the second RRC configuration message.

With reference to the third aspect, in some possible implementation manners of the third aspect, the first RRC configuration message and the second RRC configuration message are the same message.

With reference to the third aspect, in some possible implementation manners of the third aspect, before the second network device receives the TA value sent by the first network device, the method further includes:

The second network device sends a timing advance TA test instruction to the UE, to instruct the UE to send a TA test message to the first network device.

With reference to the third aspect, in some possible implementations of the third aspect, the second network device receives the DCID sent by the first network device and the time-frequency resource configuration of the uplink reference signal, including:

The second network device receives a second measurement report sent by the UE, where the second measurement report includes the cell ID of the first network where the first network device is located;

The second network device sends a measurement request to the first network device;

The second network device receives the measurement response sent by the first network device, where the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal.

With reference to the third aspect, in some possible implementation manners of the third aspect, the measurement request includes a handover threshold, or, the measurement request includes a handover threshold and a preset duration.

With reference to the third aspect, in some possible implementation manners of the third aspect, before the second network device receives the second measurement report sent by the UE, the method further includes:

The second network device sends a measurement control message to the UE to instruct the UE to perform inter-system measurement.

In combination with the third aspect, some possible implementations of the third aspect also include:

The second network device receives handover instruction information sent by the first network device, where the handover instruction message includes an identifier of a second node in the first network where the first network device is located;

The second network device sends a handover command to the UE according to the handover instruction information, the handover command includes the identifier of the second node, and the handover command is used to indicate that the UE and the second node for data transfer.

With reference to the third aspect, in some possible implementation manners of the third aspect, the handover indication message further includes:

Transmission resource information configured by the first network device for the UE, and/or a new ID allocated by the first network device for the UE.

In a fourth aspect, a network device is provided, where the network device is a first network device, including:

a sending unit, configured to send a dedicated connection identifier (DCID) to a second network device in a currently serving cell of the user equipment UE, so that the second network device forwards the DCID to the UE, where the DCID is used for the The first network device identifies the UE;

It is also used to send the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device forwards the time-frequency resource configuration of the uplink reference signal to the UE;

It is also used to send a handover instruction message to the second network device, where the handover instruction message includes an identifier of a second node in the first network where the first network device is located, so that the UE and the second Nodes transmit data.

The network device described in the fourth aspect can implement the method for cell handover described in the foregoing first aspect and various implementation manners thereof.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, a receiving unit and a processing unit are also included,

The sending unit is further configured to send a measurement indication message to the first node, instructing the first node to measure the uplink reference signal sent by the UE, the measurement indication message carrying the DCID and the uplink reference signal Time-frequency resource allocation;

The receiving unit is configured to receive a first measurement report sent by the first node, where the first measurement report carries a measurement result of the uplink reference signal sent by the UE;

The processing unit is configured to allocate the second node to the UE according to the first measurement report of the first node.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, the processing unit is specifically configured to: determine whether the measurement result carried in the first measurement report of the first node meets a handover threshold; if The second node is allocated to the UE if the measurement result carried in the first measurement report of the first node satisfies the handover threshold.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, the processing unit is specifically configured to: determine the measurement result carried in the first measurement report of the first node within a preset time length Whether the switching threshold is met.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, the receiving unit is further configured to: receive the preset duration from the second network device.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, the receiving unit is further configured to: receive the switching threshold from the second network device.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, a receiving unit is further included, configured to: receive the measurement request sent by the second network device; wherein, the DCID and the uplink reference signal The time-frequency resource configuration is included in the measurement response corresponding to the measurement request.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the handover instruction message further includes: transmission resource information configured by the first network device for the UE, and/or, the first A new ID assigned by the network device to the UE.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, a receiving unit and a processing unit are also included,

The sending unit is further configured to send a TA test instruction to the second network device, so that the second network device instructs the UE to send a TA test message;

The receiving unit is configured to receive the TA test message sent by the UE;

The processing unit is configured to determine a TA value according to the TA test message;

The sending unit is further configured to send the TA value to the UE.

With reference to the fourth aspect, in some possible implementation manners of the fourth aspect, the sending unit is specifically configured to: send the TA value to the second network device, so that the second network device sends The TA value is forwarded to the UE.

In a fifth aspect, a network device is provided, and the device includes: a processor, a memory, and a transceiver. The memory is used to store codes, and the processor is used to execute the codes in the memory. When the codes are executed, the processor can implement the method for cell handover described in the foregoing first aspect and various implementation manners.

In a sixth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores a program, and the program enables the network device to execute the above-mentioned first aspect, and any one of its various implementations is used for The method of cell handover.

In a seventh aspect, a system chip is provided, the system chip includes an input interface, an output interface, at least one processor, and a memory, and the input interface, the output interface, the processor, and the memory are connected through a bus , the processor is configured to execute the code in the memory, and when the code is executed, the processor implements the first aspect above, and any one of various implementations thereof executed by the first network device method.

In an eighth aspect, a user equipment is provided, including:

The receiving unit is configured to receive a first radio resource control RRC configuration message sent by a second network device of the current serving cell, the first RRC configuration message includes a dedicated connection identifier DCID, and the DCID is used by the first network device to identify the UE;

The receiving unit is further configured to receive a second RRC configuration message sent by the second network device, where the second RRC configuration message includes a time-frequency resource configuration of an uplink reference signal;

a sending unit, configured to send an uplink reference signal according to the first RRC configuration message and the second RRC configuration message;

The receiving unit is further configured to receive a handover command sent by the second network device, where the handover command includes an identifier of a second node allocated to the UE by the first network device;

A processing unit, configured to perform data transmission with the second node according to the switching command.

The UE in the eighth aspect can implement the method for cell handover described in the aforementioned second aspect and various implementations thereof.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the processing unit is further configured to: perform alien system detection; and generate a second measurement report according to the result of the alien system detection, the first The second measurement report includes the cell ID of the first network where the first network device is located; the sending unit is further configured to send the second measurement report to the second network device.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the processing unit performs the detection of the different system, and is specifically configured to: execute the detection of the different system when a trigger condition is met; or, perform the detection of the different system periodically; The heterosystem detection.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the trigger condition is: the signal quality of the second network device detected by the UE is lower than a preset threshold.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the receiving unit is further configured to receive the measurement control message sent by the second network device; the processing unit is specifically configured to The measurement control message performs the inter-system measurement.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the processing unit is specifically configured to: perform heterogeneous system detection, and detect the primary synchronization signal sent by the first node in the first network At least one item of PSS, secondary synchronization signal SSS, downlink reference signal of the first network, and system information SI.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the sending unit is further configured to send a timing advance TA test message to the first network device; the receiving unit is further configured to receive The TA value sent by the first network device.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the TA value is included in the second RRC configuration message.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the receiving unit is further configured to receive the TA value sent by the second network device.

With reference to the eighth aspect, in some possible implementation manners of the eighth aspect, the first RRC configuration message and the second RRC configuration message are the same message.

In a ninth aspect, a UE is provided, and the apparatus includes: a processor, a memory, and a transceiver. The memory is used to store codes, and the processor is used to execute the codes in the memory. When the codes are executed, the processor can implement the method for cell handover described in the foregoing second aspect and various implementation manners.

In a tenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores a program, and the program causes the UE to execute the above-mentioned second aspect, and any one of its various implementations is used in a cell The method of switching.

In an eleventh aspect, a system chip is provided, the system chip includes an input interface, an output interface, at least one processor, and a memory, and the input interface, the output interface, the processor, and the memory are connected by a bus In connection, the processor is configured to execute codes in the memory, and when the codes are executed, the processor implements the above-mentioned second aspect and the method performed by the UE in any one of various implementation manners thereof.

In a twelfth aspect, a network device is provided, where the network device is a second network device, including:

The receiving unit is configured to receive a dedicated connection identifier DCID and a time-frequency resource configuration of an uplink reference signal sent by the first network device, where the DCID is used by the first network device to identify a user equipment UE;

a sending unit, configured to send a first radio resource control RRC configuration message to the UE, where the first RRC configuration message includes the DCID;

The sending unit is further configured to send a second RRC configuration message to the UE, where the second RRC configuration message includes time-frequency resource configuration of an uplink reference signal, so that the UE according to the first RRC configuration message and The second RRC configuration message sends an uplink reference signal.

The network device of the twelfth aspect can implement the method for cell handover described in the aforementioned third aspect and various implementation manners thereof.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, a processing unit is further included: the processing unit is configured to advance according to the first time between the second network device and the UE TA value and a second TA value between the second network device and the first network device, and determine a third TA value between the UE and the first network device; the sending unit further It is used for sending the determined third TA value to the UE.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the receiving unit is further configured to receive the TA value sent by the first network device; the sending unit is further configured to send the TA value The TA value is sent to the UE.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the TA value is included in the second RRC configuration message.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the first RRC configuration message and the second RRC configuration message are the same message.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the sending unit is further configured to send a timing advance TA test instruction to the UE, so as to instruct the UE to The network device sends a TA test message.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the receiving unit is further configured to receive a second measurement report sent by the UE, where the second measurement report includes The cell ID of the first network where it is located; the sending unit is further configured to send a measurement request to the first network device; the receiving unit is further configured to receive a measurement response sent by the first network device, the The measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the measurement request includes a handover threshold, or, the measurement request includes a handover threshold and a preset duration.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the sending unit is further configured to send a measurement control message to the UE, so as to instruct the UE to perform inter-system measurement.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the receiving unit is further configured to receive handover indication information sent by the first network device, where the handover indication message includes the first An identifier of a second node in the first network where the network device is located; the sending unit is further configured to send a handover command to the UE according to the handover instruction information, and the handover command includes the second node's An identifier, the handover command is used to instruct the UE to perform data transmission with the second node.

With reference to the twelfth aspect, in some possible implementation manners of the twelfth aspect, the handover instruction message further includes: transmission resource information configured by the first network device for the UE, and/or, the A new ID assigned by the first network device to the UE.

In a thirteenth aspect, a network device is provided, and the device includes: a processor, a memory, and a transceiver. The memory is used to store codes, and the processor is used to execute the codes in the memory. When the codes are executed, the processor can implement the method for cell handover described in the foregoing third aspect and various implementation manners.

In a fourteenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores a program, and the program causes the network device to execute the above-mentioned third aspect, and any one of various implementations thereof method for cell handover.

In a fifteenth aspect, a system chip is provided, the system chip includes an input interface, an output interface, at least one processor, and a memory, and the input interface, the output interface, the processor, and the memory are connected by a bus connected, the processor is configured to execute the code in the memory, when the code is executed, the processor implements the third aspect above, and any one of its various implementations is executed by the second network device Methods.

In a sixteenth aspect, a communication system is provided, the communication system includes a network device, and the network device includes the first network device described in any one of the fourth to seventh aspects, and/or Or, the second network device described in any one of the implementation manners of the foregoing twelfth aspect to the fifteenth aspect.

With reference to the sixteenth aspect, in a possible implementation manner of the sixteenth aspect, the communication system further includes user equipment, and the user equipment is described in any one of the implementation manners of the eighth aspect to the eleventh aspect above. UE.

In the embodiment of the present invention, the first network device may be an NR controller, and the second network device may be a base station (such as eNB) in LTE. Correspondingly, the first network where the first network device is located may be NR. The first node may be a TP in the first TPG, and the second node may be a TP in the second TPG.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a schematic diagram of a super cell according to an embodiment of the present invention.

2(a)-(c) are schematic diagrams of application scenarios of the embodiments of the present invention.

Fig. 3 is a schematic flow chart of handover of UE moving from LTE to NR according to an embodiment of the present invention.

Fig. 4 is another schematic flowchart of handover of UE moving from LTE to NR according to an embodiment of the present invention.

Fig. 5 is another schematic flowchart of handover of UE moving from LTE to NR according to an embodiment of the present invention.

Fig. 6 is another schematic flowchart of handover of UE moving from LTE to NR according to an embodiment of the present invention.

Fig. 7 is another schematic flowchart of handover of UE moving from LTE to NR according to an embodiment of the present invention.

Fig. 8 is a schematic flow chart of handover of UE moving from NR to LTE according to an embodiment of the present invention.

FIG. 9 is another schematic flow chart of UE handover from NR to LTE according to an embodiment of the present invention.

Fig. 10 is a schematic flowchart of a method for cell reselection according to an embodiment of the present invention.

Fig. 11 is a schematic flowchart of cell handover according to the embodiment of the present invention.

Fig. 12 is another schematic flowchart of cell handover according to the embodiment of the present invention.

Fig. 13 is another schematic flowchart of cell handover according to the embodiment of the present invention.

Fig. 14 is a structural block diagram of a network device according to an embodiment of the present invention.

Fig. 15 is another structural block diagram of a network device according to an embodiment of the present invention.

Fig. 16 is a structural block diagram of a UE according to an embodiment of the present invention.

Fig. 17 is another structural block diagram of a UE according to an embodiment of the present invention.

Fig. 18 is a structural block diagram of a network device according to an embodiment of the present invention.

Fig. 19 is another structural block diagram of a network device according to an embodiment of the present invention.

FIG. 20 is a schematic structural diagram of a system chip according to an embodiment of the present invention.

Fig. 21 is a schematic structural diagram of a system chip according to an embodiment of the present invention.

Fig. 22 is a schematic structural diagram of a system chip according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be understood that the technical solution of the present invention can be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (Long Term Evolution, LTE) system, Advanced long term evolution (Advanced long term evolution, LTE-A) system, Universal Mobile Telecommunications System (UMTS), 5G, etc.

It should also be understood that in the embodiment of the present invention, the user equipment (User Equipment, UE) includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset) and portable equipment (portable equipment), etc., the user equipment can communicate with one or more core networks via the radio access network (RadioAccess Network, RAN), for example, the user equipment can be a mobile phone (or called a "cellular" phone ), a computer with a wireless communication function, etc., and the user equipment may also be a portable, pocket, hand-held, computer built-in or vehicle-mounted mobile device.

New radio (New Radio, NR) system may also be called next generation wireless (Next Radio) system or next generation network, etc., the cell in NR may be hyper cell (hyper cell), as shown in Figure 1, hyper cell can The hyper cell ID is configured, and the hyper cell may include multiple nodes of the same frequency and/or different frequency, for example, the node may be a transmission point (Transmission Point, TP). Optionally, as an embodiment, the hyper cell may also be Only one TP is included; or, the hyper cell may include multiple cells, and optionally, as an embodiment, the hyper cell may only include one cell. It can be understood that the ID of the TP (or cell) in the hyper cell may be consistent with the ID of the hyper cell, or may be configured separately.

In this embodiment of the present invention, generally, the public information of TPs in a hyper cell can be configured to be consistent, such as synchronization channel, downlink reference channel, broadcast channel, etc. The public information of the TPs in the same TP is the same, and the UE has no perception of the change of the serving cell. For example, specifically, the UE does not need to measure the downlink reference signal sent by each cell in the hyper cell. On the contrary, the UE sends the uplink reference signal, and the network side measures the UE's uplink reference signal, and selects one or more TPs for the UE based on the measurement results. for data transfer. That is to say, when the UE is moving in the hyper cell, the task of measuring the uplink reference signal and TP switching can be completed by the network side, and try to make the UE unaware of the TP change, which is equivalent to introducing the "no cell" working mode, which not only The continuity of the service can be guaranteed, and the overhead of the air interface signaling can be reduced. The UE does not need to undertake heavy measurement tasks, and the design complexity is correspondingly reduced.

It can be seen that in NR, the UE no longer performs downlink measurement, but the network measures and evaluates the link quality between the UE and the network based on the UE uplink reference signal. Therefore, generally speaking, the NR system does not need to send downlink reference signals frequently, which not only reduces inter-cell interference, but also further improves network resource utilization.

In the super cell, the NR controller (NR Controller) will allocate a dedicated connection identity (Dedicated Connection Identity, DCID) to the UE, and the super cell can identify the UE according to the DCID. That is, the NR controller can uniquely identify the UE based on the DCID. For example, the TP in the super cell can provide data communication services for the UE based on the DCID; the TP in the super cell can also identify and measure the uplink reference signal sent by the UE based on the DCID. Specifically, DCID may be referred to as Dedicated Identity (DID) for short, or as Dedicated User Identity (Dedicated UserIdentity, DUI), and may be C-RNTI, hyper cell ID, TP ID, cell ID, or a newly defined ID Any one or a combination of any of these identifiers.

In NR, a new radio controller (New Radio controller, NR controller) can provide UE mobility management. The NR controller can be an independent network element on the access network side, or a logical network element, or a centralized network unit (Centralized Unit), or a new wireless base station, but the embodiment of the present invention is not limited thereto. For example, the NR controller and the TP can be integrated in the same entity, such as an access network device, and the TP can be the transmitting and receiving unit of the access network device; or, the NR controller can also be a TP, and the TP can be Or it is not a TP in the TP set that provides data transmission services for the UE. When it is, the NR controller can directly send signaling to the UE.

It should be understood that the embodiment of the present invention does not limit the specific type of node, for example, it can be a common base station (such as NodeB or eNB), it can be a remote radio module, it can be a pico base station (pico), it can be a relay (relay ), may be a distributed network element (Distributed Unit), may be a TP, may be a DU and a TP, or any other wireless access device. In the embodiment of the present invention, the node may have all or part of the Layer 2 protocol stack functions, or the node may have all or part of the Layer 2 protocol and physical layer protocol stack functions. Wherein, the Layer 2 protocol may include: at least one of Packet Data Convergence Protocol (PacketData Convergence Protocol, PDCP), Radio Link Control (Radio Link Control, RLC), and Media Access Control (Medium Access Control, MAC). That is, the Layer 2 protocol may be PDCP, or RLC, or MAC, or PDCP and RLC, or PDCP and MAC, or RLC and MAC, or PDCP and RLC and MAC. For example, a node can be a receiving point (Transmission Reception Point, TRP) or a transmission point (Transmission Point, TP) with all or part of the layer 2 protocol, or a node can be a receiving point with all or part of the layer 2 protocol and the physical layer protocol or transmission point.

In the subsequent embodiments of the present invention, the node is TP as an example for illustration. It can be understood that if the nodes are DU and TP, then the NR controller interacts with the DU, and then each DU further interacts with the TP, that is, the NR controller interacts with the TP The interaction needs to be done through DU.

However, since NR is a user-centric system, when a UE moves between the network-centric system and the user-centric system, how to implement handover becomes a technical bottleneck.

The embodiment of the present invention is described by taking LTE as an example as a network-centric system, as shown in FIG. 2( a ) to ( c ), which are schematic diagrams of the positional relationship between LTE and NR. It can be understood that the LTE is only illustrative, and may also be other network-centric systems, which are not limited here.

In the network architecture shown in Figure 2, as the UE moves, the UE will switch between LTE and NR, and the UE expects to be able to provide continuous services.

When the UE moves from LTE to NR, whether to reside in the NR system is determined by the NR system's measurement quality of the UE's uplink SRS. The UE can configure periodic SRS in LTE. In order to reduce unnecessary waste, it is best to The UE starts to send SRS when it is covered by the NR system; in addition, the transmission configuration of the SRS requires interaction between the LTE and the NR system. When the UE moves from NR to LTE, it is also necessary to configure the UE to enable downlink measurement and reporting functions in time; if the NR system does not support measurement reports on the UE side, it needs to interact with LTE.

Fig. 3 is a schematic flow chart of handover of UE moving from LTE to NR according to an embodiment of the present invention. It should be understood that FIG. 3 shows detailed communication steps or operations applied to switching from LTE to NR, but these steps or operations are only examples. Embodiments of the present invention may also perform other operations or various operations in FIG. 3 out of shape. In addition, the various steps in FIG. 3 may be performed in a different order than that presented in FIG. 3 , and it is possible that not all operations in FIG. 3 are to be performed. Fig. 3 shows UE 10, eNB 20, NR controller 30 and TP 40, where there may be multiple TP 40s. The method shown in Figure 3 may include:

S102, UE 10 performs different system detection.

In the embodiment of the present invention, UE 10 is initially in a serving cell of LTE, and the initial serving base station is eNB 20 .

Optionally, the UE 10 may perform the different-system detection periodically, or the UE 10 may perform the different-system detection when a trigger condition is met.

In the embodiment of the present invention, the UE 10 may execute S102 according to the configuration of the eNB 20 . Specifically, before S102, UE10 receives a measurement control message (or base station configuration message) sent by eNB 20 . And in S102, UE 10 performs inter-system measurement according to the measurement control message (or base station configuration message).

As an example, UE 20 may periodically perform inter-system measurement. Optionally, before S102, UE 10 may receive a measurement control message sent by eNB 20, which instructs UE 20 to periodically perform inter-system measurement; further, UE 10 may perform inter-system measurement according to the measurement control message . It can be understood that the measurement control message may include the period size and the like. For example, this embodiment can be applied to the scenarios shown in Fig. 2(a) and Fig. 2(b).

As another example, UE 20 may perform inter-system measurement when a trigger condition is met. Optionally, before S102, UE 10 may receive a measurement control message sent by eNB 20, which indicates the trigger condition for UE 20 to perform inter-system measurement; further, UE 10 may perform inter-system measurement according to the measurement control message . Wherein, the trigger condition may be: the signal quality of the eNB 20 detected by the UE 10 is lower than a preset threshold. It can be understood that the measurement control message may include the size of the threshold and the like. For example, this embodiment can be applied to the scenarios shown in Fig. 2(b) and Fig. 2(c).

Wherein, the eNB 20 may send the measurement control message in the form of broadcast or unicast. For example, the eNB 20 may send the measurement control message to one or more UEs located at the edge of the service range of the eNB 20 according to the location of the UEs.

Here, UE 10 performing inter-system measurement means that UE 10 detects NR information and the like. For example, the UE 10 detects the NR according to the configuration, and finds that the TP of the NR sends the Primary Synchronization Signal (Primary Synchronization Signal, PSS), the Secondary Synchronization Signal (Secondary Synchronization Signal, SSS), the NR downlink reference signal, the system information (SystemInformation, SI), etc. At least one of these signals and read NR information based on these signals found.

Wherein, the NR information includes an NR cell ID. Optionally, the NR cell ID may be the aforementioned hyper cell ID, TPID, or other identifiers or physical cell identifiers (PhysicalCell ID) for uniquely identifying the NR cell. ), etc., the present invention is not limited to this. Here, the NR cell ID may also be referred to as a global NR cell ID. In addition, the NR information may further include the bandwidth and/or frequency band of the NR system.

S104, UE 10 sends a second measurement report to eNB 20.

It can be understood that before S102, the UE 10 may generate the second measurement report according to the result of the inter-system measurement. And then in S104, send the second measurement report to the eNB 20 .

Wherein, the second measurement report may include NR information, and further, the second measurement report may further include the signal quality of the current eNB 20 detected by the UE 10 . Wherein, the current signal quality of the eNB20 is the signal quality of the current serving cell, or may also be referred to as the signal quality of the current LTE cell.

That is, the second measurement report includes the NR cell ID. Optionally, the second measurement report may also include the bandwidth and/or frequency band of the NR system; optionally, the second measurement report may also include the signal quality of the current serving cell (that is, an LTE cell); optionally, the second The measurement report may also include the signal quality of the NR cell.

It can be seen that, in the embodiment of the present invention, a new triggering mechanism for the measurement report of the different system or a discovery mechanism for the different system is introduced, that is, only when the existence of the different system is detected, the measurement report of the different system is triggered. Unlike the legacy mechanism, the quality of the different system must meet the threshold before the different system measurement report can be triggered.

In the embodiment of the present invention, the triggering mechanism of the different system detection can be similar to legacy, when the UE detects that the current LTE quality is lower than a certain threshold, it starts the different system measurement; or, LTE configures the UE to periodically detect NR, or LTE according to The location information of the UE configures the UE to start detecting NR, etc.

S106, the eNB 20 sends a measurement request to the NR controller 30.

When the eNB 20 receives the second measurement report from the UE 10 , it can know that the UE 10 has detected an adjacent NR cell, and then sends a measurement request to the NR controller 30 . In order to facilitate the NR controller 30 to configure the UE 10 to send an uplink reference signal and the like.

Wherein, the measurement request may also be referred to as a measurement configuration request or a measurement configuration request message.

Optionally, the measurement request may also include UE 10 location information.

Optionally, the measurement request may also include a handover threshold, or the measurement request may also include a handover threshold and a preset duration. For a detailed description of the switching threshold and the preset duration, refer to the subsequent step S118.

S108, the NR controller 30 sends a measurement response to the eNB 20.

Optionally, the measurement response may include a DCID. The DCID is allocated by the NR controller 30 to the UE 10 , and is used by the NR controller 30 to uniquely identify the UE 10 .

Optionally, the measurement response may also include time-frequency resource configuration of the uplink reference signal. In this way, UE 10 can then send an uplink reference signal according to the time-frequency resource configuration.

Wherein, the measurement response may also be referred to as a measurement configuration response or a measurement configuration response message.

In the embodiment of the present invention, the NR controller 30 can perform NR configuration according to the measurement request, and then send the DCID (or the time-frequency resource configuration of the DCID and the uplink reference signal) to the eNB 20 in the form of NR RRC through the measurement response. In the embodiment of the present invention, it is described that the node is a TP. If the nodes are DU and TP, the interaction between the NR controller and TP in the embodiment of the present invention may be that the NR controller 30 interacts with the TP through the DU, that is, the NR controller directly interacts with the DU, and then the DU interacts with the TP. Understandably, when the TPG includes multiple TPs, the TPs in the TPG may belong to the same or different DUs.

S110, the NR controller 30 sends measurement instruction information to a first transmission point group (Transmission Point Group, TPG), so as to instruct a TP in the first TPG to measure an uplink reference signal sent by a UE.

Wherein, the first TPG includes one or more TPs. The measurement indication information may include the DCID and the time-frequency resource configuration of the uplink reference signal. Optionally, the measurement instruction information may further include a measurement threshold.

Optionally, the first TPG may be a set of all outermost TPs of the hyper cell.

Optionally, if the measurement request in S106 includes UE location information, in S110, the first TPG may be a set of outermost TPs of the hyper cell where the UE is located. That is to say, in S110, the NR controller 30 may determine the first TPG according to the location information of the UE, and then send the measurement indication information to the first TPG.

Optionally, the measurement indication information may also include at least one of the following measurement configuration parameters: carry measurement identifier, measurement event name, measurement interval, measurement report reporting mode, measurement reporting conditions, and measurement parameters. In addition, a set of measurement configuration parameters may be configured for each DCID (or each UE), or a set of measurement configuration parameters may be configured for all DCIDs (or all UEs) in the super cell. Further, the measurement configuration parameters may include: at least one of: received quality of the uplink reference signal, received power of the uplink reference signal, signal-to-noise ratio, signal-to-interference-and-noise ratio, path loss, and the like. The measurement configuration parameters may also include at least one of the thresholds of the above parameters. When the measurement parameter detected by the TP satisfies the measurement reporting condition, the TP sends a measurement report (the first measurement report in the subsequent embodiments), and includes the corresponding measurement result in the measurement report. The measurement report reporting mode may include: at least one of an event-triggered reporting mode, a periodic reporting mode, and a combination of event-triggered reporting and periodic reporting. Wherein, the event-triggered reporting mode may refer to: when the uplink reference signal measured by the TP satisfies the threshold in the measurement configuration parameter, the TP sends a measurement report to the NR controller. The periodic reporting mode may mean that the TP periodically sends measurement reports to the NR controller.

After the NR controller configures the measurement configuration parameters of the uplink reference signal for the TP, the TP can measure the uplink reference signal sent by the UE according to the measurement configuration parameters, and report the measurement result to the NR controller according to the measurement reporting mode.

It should be noted that the measurement instruction information may instruct the TP to perform intra-frequency measurement, or may instruct the TP to perform inter-frequency measurement. Alternatively, the NR controller may send measurement indication information for intra-frequency measurement to the TP, or may send measurement indication information for inter-frequency measurement to the TP. Specifically, assuming that the working frequency of the TP is F1, and the frequency at which the UE sends the uplink reference signal is F2, the NR controller can instruct the TP to perform inter-frequency measurement, that is, instruct the TP to measure the uplink reference signal sent by the UE on F2. Or, as another implementation manner, the NR controller may also instruct the UE to send an uplink reference signal at the working frequency of the TP, that is, the F1 frequency band, and then instruct the TP to perform intra-frequency measurement. In this way, the TP only needs to measure the uplink reference signal in its own working frequency band. It should be understood that the above two measurement methods may be used alone or in combination, which is not specifically limited in this embodiment of the present invention.

S112, the eNB 20 sends the first RRC configuration message to the UE 10.

Wherein, if the measurement response includes DCID, the first RRC configuration message includes DCID. If the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal, the first RRC configuration message includes the DCID and the time-frequency resource configuration of the uplink reference signal.

Optionally, the eNB 20 may send the first RRC configuration message to the UE 10 through a tunnel.

Optionally, if the measurement response does not include the time-frequency resource configuration of the uplink reference signal, after S108, the eNB20 may configure the time-frequency resource for the UE to send the uplink reference signal, and send the time-frequency resource configuration of the uplink reference signal to the NR Controller 30 and UE 10.

As an example, after S108, the eNB 20 determines the time-frequency resource configuration of the uplink reference signal, and sends the time-frequency resource configuration of the uplink reference signal to the NR controller 30 through the measurement configuration indication information. After that, the NR controller 30 executes S110 again. And in S112, the first RRC configuration message includes the DCID and the time-frequency resource configuration of the uplink reference signal.

As another example, the first RRC configuration message in S112 includes the DCID. After S108 (or after S112), the eNB 20 determines the time-frequency resource configuration of the uplink reference signal, and sends the time-frequency resource configuration of the uplink reference signal to the NR controller 30 through the measurement configuration indication information. After that, the NR controller 30 executes S110 again. And after S112, the eNB 20 may send a second RRC configuration message to the UE 10, where the second RRC configuration message includes the time-frequency resource configuration of the uplink reference signal.

It can be seen that the eNB 20 can send the DCID and the time-frequency resource configuration of the uplink reference signal to the UE 10 in one RRC configuration message; or, the eNB 20 can send the DCID and the time-frequency resource configuration of the uplink reference signal in two different RRC configuration messages respectively. The frequency resource configuration is sent to UE 10.

S114, UE 10 sends an uplink reference signal.

It should be noted that the embodiment of the present invention does not specifically limit the name, type, and form of the signal sent by the UE for network measurement. Here, the UE sends an uplink reference signal as an example, but the embodiment of the present invention is not limited thereto. For example, It may be a newly introduced tracking signal for tracking the position of the UE, or a sounding reference signal (Sounding Reference Signal, SRS) may be used.

Specifically, the UE sends the uplink reference signal according to the DCID and the time-frequency resource configuration of the uplink reference signal.

Optionally, the UE 10 may send the uplink reference signal through the time-frequency resource according to the time-frequency resource configuration of the uplink reference signal.

In an embodiment, the above-mentioned uplink reference signal may be an SRS. In an embodiment, the uplink reference signal may be sent periodically.

In this way, the TP in the first TPG can measure the uplink reference signal sent by the UE 10 according to the measurement instruction in S110.

S116, the NR controller 30 receives the first measurement report sent by the TP 40 in the first TPG.

In the embodiment of the present invention, the first measurement report may include the measurement result of the uplink reference signal, and the specific measurement result type corresponds to the measurement configuration parameter in S110. In the embodiment of the present invention, it is taken that the measurement result is signal strength information as an example. Specifically, the first measurement report carries the signal strength information of the uplink reference signal sent by the UE 10 detected by the TP 40 .

Wherein, the TP in the first TPG can determine the signal strength information of the uplink reference signal by detecting the uplink reference signal sent by the UE.

It can be understood that the signal strength information in different first measurement reports may be unequal. For example, the first measurement report sent by TP1 includes the signal strength information of the uplink reference signal detected by TP1, and the first measurement report sent by TP2 includes the signal strength information of the uplink reference signal detected by TP2.

Optionally, each TP in the first TPG sends the first measurement report.

Optionally, each TP in the first TPG that can detect the uplink reference signal sends the first measurement report.

Optionally, some TPs in the first TPG send the first measurement report. For example, if the signal strength information of the uplink reference signal detected by the first TP in the first TPG is greater than or equal to the measurement threshold, the first TP sends the first measurement report. For example, if the signal strength information of the uplink reference signal detected by the first TP in the first TPG is smaller than the measurement threshold, the first TP does not send the first measurement report.

Wherein, the measurement threshold may be predefined in each TP; or, the measurement threshold may be configured by the NR controller 30, for example, the measurement indication message in S110 may carry the measurement threshold.

S118, the NR controller 30 assigns the second TPG to the UE 10.

As an example, specifically, the NR controller 30 may determine whether the signal strength information carried in the first measurement report of the TP in the first TPG meets the handover threshold; if the first measurement report of the TP in the first TPG carries If the signal strength information meets the handover threshold, the NR controller 30 allocates the second TPG to the UE 10, and the second TPG includes one or more TPs.

It should be understood that the switching threshold is greater than the above-mentioned measurement threshold. In this embodiment of the present invention, meeting the handover threshold may refer to being greater than or equal to the handover threshold.

For example, if the signal strength information carried in the first measurement report of a certain TP (such as the first TP) in the first TPG is greater than or equal to the handover threshold, then add the TP (such as the first TP) to the second TPG middle. If the signal strength information carried in the first measurement report of a certain TP (such as the second TP) in the first TPG is smaller than the handover threshold, the TP (such as the second TP) is not added to the second TPG.

Accordingly, the NR controller 30 may select at least one TP from the first TPG as the second TPG according to the switching threshold.

Optionally, as an implementation manner, the NR controller 30 may select from TPs other than the first TPG. That is to say, all the TPs in the second TPG may belong to the first TPG, or some of the TPs in the second TPG belong to the first TPG, and other parts do not belong to the first TPG, or all the TPs in the second TPG do not belong to the first TPG. The first TPG.

Wherein, the switching threshold may be pre-configured on the NR controller 30 . Alternatively, the handover threshold may be received by the NR controller 30 from the LTE base station eNB 20, for example, the measurement request in S106 includes the handover threshold.

As another embodiment, specifically, the NR controller 30 may determine whether the signal strength information carried in the first measurement report of the TP in the first TPG within the preset time span meets the switching threshold; if within the preset time length, The signal strength information carried in all the first measurement reports of the TPs in the first TPG satisfies the handover threshold, and then the NR controller 30 allocates the second TPG to the UE 10 .

It should be understood that the switching threshold is greater than the above-mentioned measurement threshold.

Accordingly, the NR controller 30 may select at least one TP from the first TPG as the second TPG according to the preset duration and switching threshold.

Wherein, the preset duration can be realized by means of a timer, and the NR controller 30 can judge whether the signal strength information meets the switching threshold within the running time of the timer.

Optionally, as an implementation manner, the NR controller 30 may also select from other TPs other than the first TPG as part of the TPs in the second TPG. That is, all or part of the TPs in the second TPG belong to the first TPG, or all the TPs in the second TPG do not belong to the first TPG.

Wherein, the preset duration may be pre-configured on the NR controller 30 . Alternatively, the preset duration may be received by the NR controller 30 from the LTE base station eNB 20, for example, the measurement request in S106 includes the preset duration.

It can be understood that if the preset duration is realized by means of a timer, then the eNB 20 may configure the timer for the NR controller 30 before S118. For example, in S106, the measurement request includes indication information of the timer, and the indication information includes the duration of the timer (ie, the preset duration).

S120, the NR controller 30 sends a handover instruction message to the eNB 20.

Optionally, the handover indication message may include indication information of the second TPG, so that the UE 10 performs data transmission with the TP in the second TPG.

Optionally, the handover indication message may further include: transmission resource information configured by the NR controller 30 for the UE 10 , and/or, a new ID allocated by the NR controller 30 for the UE 10 .

Optionally, the handover indication message may further include layer one (L1) and/or layer two (L2) and/or layer three (L3) configurations, etc., which is not limited in the present invention.

In this way, after S120, the eNB 20 can judge whether to allow the UE 10 to perform handover according to the handover indication message. That is, the eNB 20 decides whether to use NR as the serving cell of the UE 10 .

Optionally, after receiving the handover indication message, eNB 20 may directly agree to use NR as the serving cell of UE 10 . Or, after receiving the handover indication message, the eNB 20 may make a certain judgment before deciding whether to agree to use NR as the serving cell of the UE 10 . For example, if the signal quality between eNB 20 and UE 10 is greater than or equal to a certain quality threshold, and the current load of eNB 20 is less than a certain load threshold, eNB 20 may decide to refuse to use NR as the serving cell of UE 10 . For example, if the signal quality between eNB 20 and UE 10 is less than a certain quality threshold, or the current load of eNB 20 is greater than or equal to a certain load threshold, eNB 20 may decide to use NR as the serving cell of UE 10 .

S122, the eNB 20 sends a handover command to the UE 10.

Optionally, after receiving the handover instruction message from the NR controller 30, if the eNB 20 decides to use NR as the serving cell of the UE 10, it may execute S122.

Wherein, the handover command may include indication information of the second TPG allocated by the NR controller 30 to the UE 10 .

S124, the UE 10 performs data transmission with the TP in the second TPG.

Specifically, UE 10 may use the hyper cell as a serving cell or use the hyper cell as one of the serving cells according to the handover command, and communicate with the TP in the second TPG.

If the handover indication message in S120 includes: the transmission resource information configured by the NR controller 30 for the UE 10, and correspondingly, the handover command in S122 also includes the transmission resource information, then in S124, the UE 10, according to the transmission resource information, Perform data transmission with the TP in the second TPG.

If the handover indication message in S120 includes: the new ID (such as newDCID) allocated by the NR controller 30 for the UE 10, and correspondingly, the handover command in S122 also includes the new ID, then in S124, the UE 10 uses the new ID The new ID is used for data transmission with the TP in the second TPG.

If the handover instruction message in S120 does not include the above transmission resource information and the new ID, then in S124, the UE 10 reuses the previous NR configuration to perform data transmission with the TP in the second TPG.

For example, in S124, the UE 10 may send an SRS to the TP in the second TPG according to the NR configuration, and establish data transmission with the TP in the second TPG.

In this way, the embodiments of the present invention can realize handover from the network-centered LTE system to the user-centered NR system, ensure service continuity, improve handover efficiency, and ensure transmission quality.

With reference to the embodiment shown in FIG. 3 , before the UE 10 sends the uplink reference signal in S114 , the uplink synchronization between the UE 10 and the NR controller 30 can be completed.

As an implementation of uplink synchronization, as shown in Figure 4, it may include:

S111 , the eNB 20 determines the TA between the UE 10 and the NR controller 30 .

Optionally, eNB 20 may determine the third TA between UE 10 and NR controller 30 according to the first TA value between eNB 20 and UE 10 and the second TA value between eNB 20 and NR controller 30 value.

Subsequently, eNB 20 may send the determined third TA value to UE 10 .

Optionally, as an example, as shown in FIG. 4 , the first RRC configuration message in S112 includes the DCID, the time-frequency resource configuration of the uplink reference signal, and the third TA.

Optionally, as another example, the method further includes: the eNB 20 sends the second RRC configuration message to the UE 10 . Wherein, the first RRC configuration message includes the DCID, and the second RRC configuration message includes the time-frequency resource configuration of the uplink reference signal and the third TA. Alternatively, the first RRC configuration message includes the DCID and the time-frequency resource configuration of the uplink reference signal, and the second RRC configuration message includes the third TA. At this time, S112 may be performed before or after S111, which is not limited in the present invention.

Optionally, as another example, the method further includes: the eNB 20 sends the second RRC configuration message to the UE 10 . Wherein, the first RRC configuration message includes the DCID and the third TA, and the second RRC configuration message includes the time-frequency resource configuration of the uplink reference signal. At this time, sending the second RRC configuration message may be performed before or after S111, which is not limited in the present invention.

It can be understood that, in the embodiment of FIG. 4 , the related description of S112 in FIG. 3 may be combined, and in order to avoid repetition, details are not repeated here.

In this way, in the embodiment shown in FIG. 4, eNB 20 quickly determines the TA value between UE 10 and NR controller 30, which can ensure the efficiency of handover.

Another way to implement uplink synchronization, as shown in Figure 5, may include:

The measurement response in S108 may further include a TA test instruction, so that the eNB 20 instructs the UE 10 to send a TA test message. That is to say, the measurement response in S108 includes DCID and TA test instructions. Alternatively, the measurement response in S108 includes the DCID, the time-frequency resource configuration of the uplink reference signal, and the TA test instruction.

Correspondingly, the first RRC configuration message in S112 may further include the TA test instruction. That is to say, the first RRC configuration message in S112 may include a DCID and a TA test instruction. Alternatively, the first RRC configuration message in S112 may include the DCID, the time-frequency resource configuration of the uplink reference signal, and the TA test instruction. The TA test instruction may include the random access preamble sequence preamble index configured for the UE, time-frequency resource information (such as PRACHMask Index) for sending the preamble index, and the like.

S1131, UE 10 sends a TA test message.

Specifically, the UE 10 may send the TA test message to the NR controller 30 according to the TA test instruction. Here, the TA test message may also be called an uplink TA estimation signal or an uplink TA test signal, which is not limited in the present invention.

S1131 may also include: UE 10 may randomly select a random access preamble sequence preamble index and random access time-frequency resources according to the random access resource configuration broadcast by the NR controller, and send the TA test message to the NR controller 30 .

S1132, the NR controller 30 sends the TA value to the eNB 20.

The NR controller 30 can obtain the TA value through calculation according to the received TA test message.

Optionally, in S1132, the NR controller 30 may send a measurement configuration response message to the eNB 20, where the measurement configuration response message carries the TA value.

S1133, eNB 20 sends the TA value to UE 10.

Optionally, in S1133, the eNB 20 may send a second RRC configuration message to the UE 10, and the second RRC configuration message carries the TA value.

Optionally, as an embodiment, after S1131, the NR controller 30 may directly send the TA value to the UE10. That is to say, S1132 and S1133 can be replaced by the following step: the NR controller 30 sends the TA value to the UE 10 .

As another implementation of uplink synchronization, the NR controller 30 may first configure a dedicated preamble (preamble) for the UE 10 to obtain a TA, as shown in FIG. 6 , including:

S1071, the NR controller 30 sends a dedicated preamble configuration to the UE 10 .

Specifically, the NR controller 30 may configure a random access preamble sequence preamble index for the UE 10, and send the time-frequency resource information of the preamble index.

S1072, the UE 10 sends a TA test message to the NR controller 30 .

Here, the TA test message may also be called an uplink TA estimation signal or an uplink TA test signal, which is not limited in the present invention.

Specifically, the UE 20 can directly access the NR controller 30 according to the dedicated preamble configuration, without initiating the establishment process of the NAS and S1-like interface, without data transmission, thus improving the efficiency of handover.

Further, the measurement response in S108 includes DCID, time-frequency resource configuration and TA value of the uplink reference signal.

It can be understood that the NR controller 30 may first configure a dedicated preamble for the UE 10 to obtain a TA value, and then configure the DCID and time-frequency resources of the uplink reference signal.

Correspondingly, the first RRC configuration message in S112 also includes the DCID, the time-frequency resource configuration of the uplink reference signal and the TA value.

In this way, in the embodiment shown in FIG. 5 or FIG. 6, NR controller 30 determines the TA value between UE 10 and NR controller 30 based on the TA test message sent by UE 10, which can ensure the accuracy of TA value, Thereby ensuring the switching quality.

Optionally, as another embodiment, the handover decision performed by the UE 10 may also be performed by the eNB 20, as shown in FIG. 7 . Part or all of the steps from S102 to S116 may be performed before S1171 shown in FIG. 7 , and steps S102 to S116 may refer to any embodiment shown in FIGS. 3 to 6 above. To avoid repetition, details are not repeated here.

S1171, the NR controller 30 sends measurement indication information to the eNB 20.

Optionally, the NR controller 30 may determine whether the signal strength information carried in the first measurement report of the TP in the first TPG meets the handover threshold; if the signal strength information carried in the first measurement report of the TP in the first TPG satisfies To switch the threshold, the NR controller 30 executes S1171. Wherein, the switching threshold may be pre-configured on the NR controller 30 . Alternatively, the handover threshold may be received by the NR controller 30 from the LTE base station eNB 20, for example, the measurement request in S106 includes the handover threshold.

Optionally, the NR controller 30 may determine whether the signal strength information carried in the first measurement report of the TP in the first TPG within the preset time span meets the switching threshold; if within the preset time length, the TP in the first TPG If the signal strength information carried in the first measurement report of the TP satisfies the handover threshold, then the NR controller 30 executes S1171. Wherein, the switching threshold and the preset duration may be pre-configured on the NR controller 30 . Alternatively, the handover threshold and the preset duration may be received by the NR controller 30 from the LTE base station eNB 20, for example, the measurement request in S106 includes the handover threshold and the preset duration.

The measurement indication information may include the first measurement report of the TP in the first TPG. Alternatively, the measurement indication information may include indication information that satisfies the handover quality requirement, such as TRUE or 1.

S1172, the eNB 20 executes a handover decision.

Specifically, eNB 20 decides whether to use NR as a serving cell of UE 10 . Optionally, after receiving the measurement indication information, the eNB 20 may directly agree to use NR as the serving cell of the UE 10 . Alternatively, after receiving the measurement instruction information, the eNB 20 may make a certain judgment before deciding whether to agree to use NR as the serving cell of the UE 10 . For example, if the signal quality between eNB 20 and UE 10 is greater than or equal to a certain quality threshold, and the current load of eNB 20 is less than a certain load threshold, eNB 20 may decide to refuse to use NR as the serving cell of UE 10 . For example, if the signal quality between eNB 20 and UE 10 is less than a certain quality threshold, or the current load of eNB 20 is greater than or equal to a certain load threshold, eNB 20 may decide to use NR as the serving cell of UE 10 .

If the eNB 20 decides to use the NR as the serving cell of the UE 10, S1173 may be executed.

S1173, the eNB 20 sends a handover request to the NR controller 30.

S118, the NR controller 30 assigns the second TPG to the UE 10.

Specifically, after receiving the handover request, the NR controller 30 may use all or part of the TPs in the first TPG meeting the handover threshold as the second TPG.

Optionally, the NR controller 30 may also configure a new ID (such as new DCID) and/or transmission resources for the UE 10 .

S1174, the NR controller 30 sends a handover response to the eNB 20 .

The handover response may include indication information of the second TPG. Optionally, the handover response may further include transmission resource information configured by the NR controller 30 for the UE 10 , and/or a new ID allocated by the NR controller 30 for the UE 10 .

Optionally, the handover response may further include layer one (L1) and/or layer two (L2) and/or layer three (L3) configurations, etc., which is not limited in the present invention.

Further, for S122 and S124, reference may be made to the relevant description in the embodiment of FIG. 3 , and to avoid repetition, details are not repeated here.

It can be seen that in the embodiment of the present invention, the UE performs inter-system detection, and the handover from the LTE system to the NR system can be completed based on the detection, which can ensure the continuous mobility of the UE between the LTE system and the NR system, and ensure the efficiency of the handover.

Fig. 8 is a schematic flow chart of handover of UE moving from NR to LTE according to an embodiment of the present invention. It should be understood that FIG. 8 shows detailed communication steps or operations applied to handover from NR to LTE, but these steps or operations are only examples. Embodiments of the present invention may also perform other operations or various operations in FIG. 8 out of shape. In addition, the various steps in FIG. 8 may be performed in a different order than that presented in FIG. 8, and it is possible that not all operations in FIG. 8 are performed. The UE 10, the NR controller 30 and the eNB 20 are shown in Fig. 8 . The method shown in Figure 8 may include:

S202, the NR controller 30 sends the measurement configuration to the UE 10.

In the embodiment of the present invention, the UE 10 is initially within the service range of the hyper cell. When the UE 10 is in the hypercell, it will periodically or uninterruptedly send the uplink reference signal, so that the NR controller 30 can determine the position of the UE 10 according to the first measurement report of the uplink reference signal detected by the TP.

For example, the NR controller 30 receives the first measurement report sent by each TP in at least one TP, and the at least one TP is located at the edge of the hyper cell, then the NR controller 30 may determine that the UE 10 is also located at the edge of the hyper cell edge. Furthermore, the NR controller 30 can execute S202.

Specifically, the measurement configuration in S202 is used to instruct the UE 10 to perform downlink measurement. Alternatively, the measurement configuration in S202 is used to instruct the UE 10 to perform downlink measurement periodically, where the measurement configuration may carry the period.

S204, the eNB 20 sends a downlink reference signal.

Generally, a base station (ie eNB 20 ) in LTE periodically sends downlink reference signals. It should be noted that the embodiment of the present invention does not specifically limit the name, type, and form of the signal sent by the eNB 20 for user measurement. Here, the downlink reference signal sent by the eNB 20 is taken as an example, but the embodiment of the present invention is not limited thereto. For example, it may be a downlink synchronization signal.

S206, UE 10 performs downlink measurement.

The UE 10 may perform downlink measurement according to the measurement configuration in S202, so as to detect the downlink reference signal sent by the eNB 20.

In S206, the UE 10 can determine its signal quality according to the detected downlink reference signal, and can obtain the ID of the eNB 20 .

S208, UE 10 sends a third measurement report to NR controller 30 .

Optionally, the third measurement report may include the signal quality of the downlink reference signal and/or the ID of the LTE cell.

Optionally, the third measurement report may also include the ID of the UE 10 .

S210, the NR controller 30 sends a handover request to the eNB 20.

Optionally, the third measurement report includes the signal quality of the downlink reference signal, and if the signal quality is greater than or equal to the handover threshold, the NR controller 30 sends a handover request to the eNB 20 .

Optionally, the handover request may include UE 10's ID.

S212, the eNB 20 sends a handover response to the NR controller 30.

S214, the NR controller 30 sends a handover command to the UE 10.

In this way, UE 10 may perform a random access procedure with eNB 20 after receiving the handover command, and then perform S216.

S216, UE 10 and eNB 20 perform data transmission.

It can be seen that if NR supports inter-system measurement reports on the UE side, the handover from the NR system to the LTE system can be completed as shown in Figure 8, and this method can ensure continuous movement of the UE between the NR system and the LTE system To ensure switching efficiency.

As another embodiment, if the NR does not support the inter-system measurement process on the UE side, as shown in FIG. 9, after S208, the method may include:

S209, the NR controller 30 sends measurement instruction information to the eNB 20.

Optionally, the measurement indication information may include the signal quality of the downlink reference signal and/or the ID of the eNB.

Optionally, the measurement indication information may also include the ID of the UE 10 .

In this way, the eNB can judge whether the signal quality of the downlink reference signal meets the handover threshold, and if so, execute S211.

S211, the eNB 20 sends handover instruction information to the NR controller 30.

Specifically, if the signal quality of the downlink reference signal is greater than or equal to the handover threshold, the eNB 20 sends handover instruction information to the NR controller 30 .

It can be understood that if the signal quality of the downlink reference signal is greater than or equal to the handover threshold, the eNB 20 can determine that the UE 10 is already within the service range of the eNB 20, and then allow the UE 10 to perform handover, that is, allow the UE 10 to switch the eNB 20 as a serving cell.

It can be understood that for the steps with the same serial number in FIG. 9 , reference may be made to the related description in the embodiment of FIG. 8 , and details are not repeated here to avoid repetition.

It can be seen that if NR does not support the measurement report of different systems on the UE side, the handover from the NR system to the LTE system can be completed as shown in Figure 9, and this method can ensure the continuous operation of the UE between the NR system and the LTE system. Mobility ensures switching efficiency.

As another embodiment, FIG. 10 is a schematic flowchart of a method for cell reselection according to an embodiment of the present invention. include:

S201, UE 10 receives indication information from TP 40 .

The UE 10 may be in a moving state in the hyper cell, and when the UE 10 moves to the edge of the hyper cell, a TP (such as TP3 ) at the outermost layer of the hyper cell may send indication information to the UE 10 . That is to say, TP 40 in FIG. 10 is the outermost TP of the hyper cell, for example, TP3.

Optionally, the indication information may be carried in a system message, or in a PSS or SSS or other downlink public channels, which is not limited in the present invention. Wherein, the indication information may be sent by TP 40 in the form of broadcast.

Optionally, the indication information may also be sent by the NR controller to the UE 10 through dedicated signaling.

It can be understood that before S201, the NR controller 30 may configure the outermost TP of the hyper cell, so that the outermost TP sends indication information to the UE 10 after detecting the uplink reference signal of the UE 10 .

Optionally, if TP 40 (that is, the TP at the outermost layer of the hyper cell, such as TP3) detects the uplink reference signal of UE 10, and the signal strength of the uplink reference signal is lower than a certain threshold, then TP 40 may determine that the UE 10 has reached the edge of the hypercell, then the TP 40 may send indication information to the UE 10 .

S205, the UE 10 performs downlink measurement according to the indication information.

Specifically, the UE in the hyper cell may be in a power-saving state or an active state. That is, the UE has two states and can switch between these two states. For example, when the UE data transmission is completed and there is no business data transmission for a period of time, the UE can switch from the active state to the power-saving state; in the power-saving state, The UE does not need to monitor the dynamic control channel, but only needs to support a small amount of connection management, and its power consumption will be less than that in the active state. For example, the UE in the power-saving state may continue to reserve a dedicated user equipment identity, continue to send uplink reference signals, and monitor paging messages.

Wherein, the UE in the power-saving state may also be called the UE in the idle state or the UE in the ECO state, where ECO means Ecology (ecology), Conservation (energy saving), and Optimization (optimization). Wherein, the UE in the active state may also be referred to as the UE in the connected state. When the UE in the active state does not transmit data for a period of time, the UE in the active state may enter DRX.

Specifically, UE 10 may perform downlink measurement when a trigger condition is met. Wherein, the trigger condition may be: (1), the indication information of the TP is received, (2), the UE has reached the edge of the hyper cell, (3), the UE is in a power-saving state, or is in an active state without service transmission, or In the active state of DRX, at least one of.

For example, if the UE 10 has reached the edge of the hyper cell, and the UE 10 is in a power-saving state or in an active state without service transmission, the UE 10 may perform downlink measurement.

Specifically, performing downlink measurement by the UE 10 means that the UE 10 measures the downlink reference signals of each neighboring cell 50 according to the configuration of the NR controller or the configuration broadcast by the NR controller, and the neighboring cell 50 may be a cell of the eNB, or a neighboring cell 50 NR hypercell. For example, the UE 10 detects the downlink reference signal sent by the neighboring cell 50 in S203.

S207, UE 10 reselects to a neighboring cell.

Specifically, if UE 10 detects that the signal quality of the hyper cell currently located is lower than the first threshold, and/or, if UE 10 detects that the signal quality of the downlink reference signal of a neighboring cell is higher than the second threshold, UE 10 Perform cell reselection. Wherein, the second threshold is greater than the first threshold.

For example, UE 10 performs downlink measurement in S205, and performs cell reselection based on the measurement result. Optionally, UE 10 may try to choose to camp on a cell with good signal conditions.

It can be seen that the UE in the power-saving state or the no-service active state or the DRX active state in the hyper cell can perform downlink measurement, and thus can complete cell reselection.

Fig. 11 is a schematic flowchart of cell handover according to the embodiment of the present invention. The methods shown in Figure 11 include:

S301. The first network device sends a dedicated connection identifier DCID to the second network device of the current serving cell of the user equipment UE, so that the second network device forwards the DCID to the UE, where the DCID is used for the UE The first network device identifies the UE.

S302. The first network device sends the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device forwards the time-frequency resource configuration of the uplink reference signal to the UE.

S303. The first network device sends a handover instruction message to the second network device, where the handover instruction message includes an identifier of a second node in the first network where the first network device is located, so that the UE and the Nodes for data transmission.

Optionally, the first network device in this embodiment of the present invention is a network device in a user-centric system, and the second network device is a network device in a network-centric system. For example, the first network device is the NR controller in the foregoing embodiment, and the second network device is the eNB in the foregoing embodiment. Correspondingly, the first network where the first network device is located may be NR. The present invention is not limited thereto.

Optionally, before S303, it may also include:

The first network device sends a measurement indication message to the first node, instructing the first node to measure the uplink reference signal sent by the UE, where the measurement indication message carries the DCID and the time-frequency of the uplink reference signal resource allocation;

The first network device receives a first measurement report sent by the first node, where the first measurement report carries a measurement result of the uplink reference signal sent by the UE;

The first network device allocates the second node to the UE according to the first measurement report of the first node.

Therefore, the node in S303 includes the second node, that is, the handover indication message includes the identifier of the second node, so that the UE performs data transmission with the second node.

Optionally, the measurement indication message may further include a measurement threshold, so that the first node reports based on the measurement threshold. Specifically, under the condition that the first node detects that the signal strength of the uplink reference signal is greater than or equal to the measurement threshold, the first node sends the first measurement report to the first network device.

Optionally, as an embodiment, the nodes may be TPs, for example, the first node is a TP in a first transmission point group (Transmission Point Group, TPG), and the second node is a TP in a second TPG. Correspondingly, the first network device receives the first measurement report of the TP in the first TPG, and allocates the second TPG to the UE according to the first measurement report of the TP in the first TPG. The first measurement report here may be sent by the TPs in the first TPG respectively.

Optionally, as another embodiment, the nodes may be DU and TP. Correspondingly, the first network device receives the first measurement report of the TP in the first TPG sent by the DU, and according to the first measurement report of the TP in the first TPG, A measurement report, assigning a second TPG to the UE. That is, the TPs in the first TPG respectively send first measurement reports to the DUs, and the first network device receives the first measurement reports of the TPs in the first TPG from the DUs. Understandably, the TPs of the first TPG may belong to the same or different DUs, and the TPs of the second TPG may belong to the same or different DUs.

Wherein, the first TPG may include one or more TPs; the second TPG may include the first or more TPs.

Optionally, as an embodiment, the first network device assigning the second node to the UE according to the first measurement report of the first node may include: the first network device judging that the first Whether the measurement result carried in the first measurement report of the node satisfies the handover threshold; if the measurement result carried in the first measurement report of the first node satisfies the handover threshold, the first network device is the The UE allocates the second node.

Wherein, the switching threshold may be pre-stored or pre-configured in the first network device, or may be acquired by the first network device from the second network device. For example, before this, it may include: the first network device receives the handover threshold from the second network device.

Optionally, as an embodiment, the first network device assigning the second node to the UE according to the first measurement report of the first node may include: the first network device judging that within a preset time period Whether the measurement result carried by the first measurement report of the first node within the first node meets the handover threshold; if the measurement result carried by the first measurement report of the first node satisfies the handover threshold, then the first A network device allocates the second node for the UE.

Wherein, the preset duration and the switching threshold may be pre-stored or pre-configured in the first network device, or may be acquired by the first network device from the second network device. For example, before this, it may include: the first network device receives the preset duration and the switching threshold from the second network device.

In the embodiment of the present invention, S301 and S302 can be executed simultaneously. For example, before S301, the first network device receives a measurement request sent by the second network device. Correspondingly, S301 and S302 may include: the first network device sends a measurement response to the second network device, and the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal. That is to say, the DCID and the time-frequency resource configuration of the uplink reference signal are included in the measurement response corresponding to the measurement request. For related descriptions, reference may be made to the specific descriptions of S106 and S108 in the foregoing embodiments, and details are not repeated here to avoid repetition.

Optionally, as an example, before S303, the second network device may determine the TA value between the first network device and the UE, which may include: the first network device receiving the TA value sent by the second network device.

Optionally, as an example, before S303, the first network device may determine the TA value between itself and the UE, which may include: the first network device sends a TA test instruction to the second network device, so that The second network device instructs the UE to send a TA test message; the first network device receives the TA test message sent by the UE; the first network device determines the TA value according to the TA test message; the first network device sends the TA value to UE.

Wherein, the first network device may send the TA value to the UE. Alternatively, the first network device may send the TA value to the second network device, and the second network device forwards the TA value to the UE.

In this embodiment of the present invention, for S303, refer to the relevant explanations of S120 in the foregoing embodiments. For example, the handover instruction message may also include: information about transmission resources configured by the first network device for the UE, and/or, the A new ID and the like allocated by the first network device to the UE. To avoid repetition, details are not repeated here.

It can be seen that the first network device in the embodiment of the present invention can send the DCID and the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device can instruct the UE to send the uplink reference signal. Further, the first network device may instruct the UE to use the first network device as a serving cell through a handover instruction message, and perform data communication with a node on the first network side, so that the handover from the second network device to the first network device can be completed , ensuring service continuity of the UE.

Fig. 12 is another schematic flowchart of cell handover according to the embodiment of the present invention. The methods shown in Figure 13 include:

S401. The UE receives a first RRC configuration message sent by a second network device in a current serving cell, where the first RRC configuration message includes a DCID, and the DCID is used by the first network device to identify the UE.

S402. The UE receives a second RRC configuration message sent by the second network device, where the second RRC configuration message includes time-frequency resource configuration of an uplink reference signal.

S403. The UE sends an uplink reference signal according to the first RRC configuration message and the second RRC configuration message.

S404. The UE receives a handover command sent by the second network device, where the handover command includes the identifier of the second node allocated to the UE by the first network device.

S405. The UE performs data transmission with the second node according to the handover command.

Optionally, the first network device in this embodiment of the present invention is a network device in a user-centric system, and the second network device is a network device in a network-centric system. For example, the first network device is the NR controller in the foregoing embodiment, and the second network device is the eNB in the foregoing embodiment. Correspondingly, the first network where the first network device is located may be NR. The present invention is not limited thereto.

Optionally, S401 and S402 can be performed at the same time, wherein the first RRC configuration message and the second RRC configuration message can be the same message, for example, the first RRC configuration message, at this time, the first RRC configuration message includes DCID and uplink The time-frequency resource configuration of the reference signal.

As an embodiment, before S401, it may include: the UE within the service range of the second network device performs the detection of the different system; the UE generates a second measurement report according to the result of the detection of the different system, the The second measurement report includes the cell ID of the first network side where the first network device is located; the UE sends the second measurement report to the second network device.

Specifically, the UE may perform the different-system detection when a trigger condition is met; or, the UE may perform the different-system detection periodically.

Wherein, the trigger condition may be: the signal quality of the second network device detected by the UE is lower than a preset threshold.

Wherein, the UE may receive a measurement control message sent by the second network device; and perform the inter-system measurement according to the measurement control message. Optionally, the measurement control message may include the above-mentioned preset threshold, so that the UE may perform inter-system detection based on a trigger condition. Alternatively, the measurement control message may include a period size, so that the UE may perform inter-system detection based on the period.

Specifically, the UE performs different system detection, which may include: the UE performs different system detection, and detects the primary synchronization signal PSS, the secondary synchronization signal SSS, and the downlink reference signal of the first network sent by the first node in the first network , at least one item of system information SI.

Optionally, the first node in this embodiment of the present invention may include a TP in the first TPG, and the second node may include a TP in the second TPG.

In addition, in the embodiment of the present invention, before S403, it may further include: the UE completes uplink synchronization with the first network device.

Optionally, as an example, before S403, the UE receives the TA value sent by the second network device. The TA value is determined by the second network device according to the first TA value between the second network device and the UE and the second TA value between the second network device and the first network device.

Optionally, as another example, before S403, the UE receives a TA test instruction sent by the second network device; according to the TA test instruction, the UE sends a TATA test message to the first network device; and, the UE receives the first TA value sent by the network device.

Wherein, the UE may directly receive the TA value from the first network device. Alternatively, the UE may receive the TA value determined by the first network device from the second network device. That is to say, the first network device may send the TA value to the second network device, and then the second network device forwards the TA value to the UE.

Optionally, the TA value may be carried in the second RRC configuration message. That is, the second RRC configuration message may include the time-frequency resource configuration and TA value of the uplink reference signal. It can be understood that if the second RRC configuration message and the first RRC configuration message are the same message, the first RRC configuration message may include the DCID, the time-frequency resource configuration of the uplink reference signal, and the TA value.

Optionally, in S403, the UE may use the time-frequency resource configuration of the uplink reference signal based on the DCID to send the uplink reference signal to the node in the first network device. For example, the TP in the first TPG on the first network side where the first network device is located can detect the uplink reference signal, and send the first measurement report to the first network device.

Optionally, the switching command in S404 may include the identifier of the second node. Further, in S405, the UE performs data transmission with the second node according to the handover command. For example, if the second node is a TP in the second TPG, the switching command in S404 may include indication information of the second TPG. Correspondingly, in S405, the UE may perform data transmission with the TP in the second TPG according to the handover command.

It can be understood that in this embodiment of the present invention, the UE may use the first network where the first network device is located as a serving cell of the UE according to the handover command; or, the UE may handover the serving cell to the network where the first network device is located according to the handover instruction. first network.

In this way, the UE in the embodiment of the present invention can send the uplink reference information based on the time-frequency resource configuration of the DCID and the uplink reference signal sent by the second network device, and then can complete the handover from the second network device to the first network device based on the handover command, ensuring business continuity.

Fig. 13 is another schematic flowchart of cell handover according to the embodiment of the present invention. The methods shown in Figure 13 include:

S501. The second network device receives a DCID and a time-frequency resource configuration of an uplink reference signal sent by the first network device, where the DCID is used by the first network device to identify a UE.

S502. The second network device sends a first RRC configuration message to the UE, where the first RRC configuration message includes the DCID.

S503. The second network device sends a second RRC configuration message to the UE, where the second RRC configuration message includes the time-frequency resource configuration of the uplink reference signal, so that the UE according to the first RRC configuration message and the The second RRC configuration message sends the uplink reference signal.

Optionally, the first network device in this embodiment of the present invention is a network device in a user-centric system, and the second network device is a network device in a network-centric system. For example, the first network device is the NR controller in the foregoing embodiment, and the second network device is the eNB in the foregoing embodiment. Correspondingly, the first network where the first network device is located may be NR. The present invention is not limited thereto.

Optionally, the second network device may receive the second measurement report sent by the UE, where the second measurement report includes the cell ID of the first network where the first network device is located. The cell ID here may be determined by the UE performing inter-system measurement. Further, the second network device may send a measurement request to the first network device, and receive a measurement response from the first network device, where the measurement response may include the DCID and the time-frequency resource configuration of the uplink reference signal. Optionally, before this, the second network device may send a measurement control message to the UE, so that the UE performs inter-system measurement based on the measurement control message.

Wherein, the measurement request may include a switching threshold and/or a preset duration.

It can be seen that in S501, the second network device may receive the DCID and the time-frequency resource configuration of the uplink reference signal by measuring the response.

Optionally, S502 and S503 can be performed at the same time, wherein the first RRC configuration message and the second RRC configuration message can be the same message, for example, the first RRC configuration message, at this time, the first RRC configuration message includes DCID and uplink The time-frequency resource configuration of the reference signal. That is to say, the second network device may send the first RRC configuration message to the UE, where the first RRC configuration message includes the DCID and the time-frequency resource configuration of the uplink reference signal, so that the UE Configure to send an uplink reference signal.

Optionally, as an example, the method may further include: the second network device according to the first TA value between the second network device and the UE and the TA value between the second network device and the first network device determine a second TA value between the UE and the first network device; and the second network device sends the determined TA value to the UE.

Optionally, as another example, the method may further include: the second network device receiving the TA value sent by the first network device; and the second network device sending the TA value to the UE.

Optionally, as another example, the method may further include: the second network device receiving the TA test instruction sent by the first network device, and the second network device forwarding the TA test instruction to the UE, so that the UE sends the TA test instruction to the first network device Send TA test message. Further, the second network device may receive the TA value determined by the first network device based on the TA test message, and send the TA value to the UE.

Optionally, the TA value may be carried in the second RRC configuration message, that is, the second RRC configuration message may include the time-frequency resource configuration and the TA value of the uplink reference signal. It can be understood that if the second RRC configuration message and the first RRC configuration message are the same message, the first RRC configuration message may include the DCID, the time-frequency resource configuration of the uplink reference signal, and the TA value.

In addition, further, the second network device may receive handover instruction information sent by the first network device, where the handover instruction information includes the identifier of the second node in the first network where the first network device is located; indication information, sending a handover command to the UE, where the handover command includes the identifier of the second node, and the handover command is used to instruct the UE to perform data transmission with the second node.

Wherein, the second node may be a TP in the second TPG.

Wherein, optionally, the handover indication message may further include: transmission resource information configured by the first network device for the UE, and/or a new ID allocated by the first network device for the UE. Correspondingly, it can be understood that the handover command may further include: transmission resource information configured by the first network device for the UE, and/or a new ID allocated by the first network device for the UE.

It can be seen that, in the embodiment of the present invention, for a UE within the service range of the second network device, the second network device can assist in completing the handover from the second network device to the first network device, and service continuity of the UE can be included.

Fig. 14 is a structural block diagram of a network device according to an embodiment of the present invention. The network device 100 shown in FIG. 14 may be the first network device 100 and includes a sending unit 120 , a receiving unit 140 and a processing unit 160 .

The sending unit 120 is configured to: send a dedicated connection identifier DCID to a second network device of the current serving cell of the user equipment UE, so that the second network device forwards the DCID to the UE, where the DCID is used for all The first network device identifies the UE; it is also used to send the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device forwards the time-frequency resource configuration of the uplink reference signal To the UE; further configured to send a handover instruction message to the second network device, where the handover instruction message includes an identifier of a second node in the first network where the first network device is located, so that the UE Perform data transmission with the second node.

Optionally, the first network device in this embodiment of the present invention is a network device in a user-centric system, and the second network device is a network device in a network-centric system. For example, the first network device is the NR controller in the foregoing embodiment, and the second network device is the eNB in the foregoing embodiment. Correspondingly, the first network where the first network device is located may be NR. The present invention is not limited thereto.

As an example, the handover instruction message may further include: transmission resource information configured by the first network device for the UE, and/or a new ID allocated by the first network device for the UE. In this way, the UE can communicate with the second node according to the transmission resource information.

Optionally, as an embodiment, the sending unit 120 is further configured to send a measurement indication message to the first node, instructing the first node to measure the uplink reference signal sent by the UE, the measurement indication message carrying the DCID and the time-frequency resource configuration of the uplink reference signal. The receiving unit 140 is configured to receive a first measurement report sent by the first node, where the first measurement report carries a measurement result of the uplink reference signal sent by the UE. The processing unit 160 is configured to allocate the second node to the UE according to the first measurement report of the first node.

For example, the measurement result of the uplink reference signal may be signal strength information of the uplink reference signal. Correspondingly, the first measurement report may carry signal strength information of the uplink reference signal sent by the UE.

Wherein, the processing unit 160 may be specifically configured to: determine whether the measurement result carried in the first measurement report of the first node satisfies a handover threshold; if the measurement result carried in the first measurement report of the first node satisfies The handover threshold is to allocate the second node to the UE.

Optionally, the processing unit 160 may be specifically configured to: determine whether the measurement result carried in the first measurement report of the first node within a preset time duration satisfies the handover threshold.

In the embodiment of the present invention, the preset duration and/or the switching threshold may be preset in the first network device, or may be acquired from the second network device. For example, the sending unit 120 may also be configured to receive the preset duration and/or the switching threshold from the second network device.

Optionally, as another embodiment, the receiving unit 140 may be configured to: receive the measurement request sent by the second network device. Wherein, the DCID and the time-frequency resource configuration of the uplink reference signal are included in a measurement response corresponding to the measurement request. That is to say, the sending unit 120 may be specifically configured to send a measurement response to the second network device, and the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal.

In the embodiment of the present invention, before the UE sends the uplink reference signal, the uplink synchronization between the UE and the first network device may also be completed.

Optionally, as an example, the receiving unit 140 may be configured to receive the TA value sent by the second network device. The TA value here may be determined by the second network device itself, for example, it may be based on the first TA value between the second network device and the UE and the first TA value between the second network device and the first network device. determined by the diTA value.

Optionally, as another example, the sending unit 120 may be configured to send a TA test instruction to the second network device, so that the second network device instructs the UE to send a TA test message. The receiving unit 140 may be configured to receive the TA test message sent by the UE. The processing unit 160 may be configured to determine a TA value according to the TA test message. The sending unit 120 may also be configured to send the TA value to the UE. That is to say, the TA value here may be determined by the first network device based on the TA test message.

Wherein, the sending unit 120 sending the TA value to the UE may be: sending the TA value to the second network device, so that the second network device forwards the TA value to the UE.

It should be noted that in this embodiment of the present invention, the sending unit 120 may be implemented by a transmitter, the receiving unit 140 may be implemented by a receiver, and the processing unit 160 may be implemented by a processor. As shown in FIG. 15 , the first network device 100 may include Processor 110 , transmitter 130 , receiver 150 and memory 170 . Wherein, the memory 170 may be used to store codes executed by the processor 110 and the like.

Various components in the first network device 100 are coupled together through a bus system 190, wherein the bus system 190 includes not only a data bus, but also a power bus, a control bus and a status signal bus.

The network device 100 shown in FIG. 14 or the network device 100 shown in FIG. 15 can implement the various processes performed by the NR controller or the first network device in the foregoing method embodiments in FIGS. 1 to 13 . Let me repeat.

Fig. 16 is a structural block diagram of a UE according to an embodiment of the present invention. The UE 200 shown in FIG. 16 may include a receiving unit 220 , a sending unit 240 and a processing unit 260 .

The receiving unit 220 is configured to receive a first RRC configuration message sent by a second network device of the current serving cell, where the first RRC configuration message includes a DCID, and the DCID is used by the first network device to identify the UE; the receiving unit 220 is further configured to receive a second RRC configuration message sent by the second network device, where the second RRC configuration message includes a time-frequency resource configuration of an uplink reference signal;

A sending unit 240, configured to send an uplink reference signal according to the first RRC configuration message and the second RRC configuration message;

The receiving unit 220 is further configured to receive a handover command sent by the second network device, where the handover command includes an identifier of a second node allocated to the UE by the first network device;

The processing unit 260 is configured to perform data transmission with the second node according to the switching command.

Optionally, the first network device in this embodiment of the present invention is a network device in a user-centric system, and the second network device is a network device in a network-centric system. For example, the first network device is the NR controller in the foregoing embodiment, and the second network device is the eNB in the foregoing embodiment. Correspondingly, the first network where the first network device is located may be NR. The present invention is not limited thereto.

Optionally, as an embodiment, the processing unit 260 may also be configured to: perform alien system detection; and generate a second measurement report according to the result of the alien system detection, where the second measurement report includes the The cell ID of the first network. The sending unit 240 may also be configured to send the second measurement report to the second network device.

Wherein, as an example, the processing unit 260 may be specifically configured to: execute the alien system detection when a trigger condition is met; or periodically execute the alien system detection. The trigger condition may be: the signal quality of the second network device detected by the processing unit 260 is lower than a preset threshold.

Optionally, as another embodiment, the receiving unit 220 may also be configured to receive a measurement control message sent by the second network device. The processing unit 260 may be specifically configured to perform the inter-system measurement according to the measurement control message. Subsequently, the processing unit 260 may generate a second measurement report according to the result of the alien system detection. And the sending unit 240 sends the second measurement report to the second network device.

The aforementioned processing unit 260 performing different system detection may be: performing different system detection, and detecting the primary synchronization signal PSS, the secondary synchronization signal SSS, and the downlink reference of the first network sent by the first node in the first network At least one of signal and system information SI.

In addition, in the embodiment of the present invention, before the UE sends the uplink reference signal, the uplink synchronization with the first network device may also be completed.

Optionally, as an example, the receiving unit 220 may also be configured to receive the TA value sent by the second network device. Wherein, the TA value may be determined by the second network device itself, or may be received by the second network device from the first network device.

Optionally, as another example, the receiving unit 220 may receive a TA test instruction sent by the second network device. According to the TA test instruction, the first network device in the sending unit 240 sends a TA test message. The receiving unit 220 further receives the TA value sent by the first network device.

For example, the TA value may be sent by the first network device to the second network device, and then sent by the second network device to the UE.

As an example, the TA value may be included in the second RRC configuration message sent by the second network device. That is to say, the receiving unit 220 receives the second RRC configuration message sent by the second network device, and the second RRC configuration message may include the time-frequency resource configuration and the TA value of the uplink reference signal.

In addition, as another implementation manner, the first RRC configuration message and the second RRC configuration message are the same message. It can be seen that the first RRC configuration message may include the DCID and the time-frequency resource configuration of the uplink reference signal; or, the first RRC configuration message may include the DCID, the time-frequency resource configuration of the uplink reference signal and the TA value.

It should be noted that in this embodiment of the present invention, the receiving unit 220 may be implemented by a receiver, the sending unit 240 may be implemented by a transmitter, and the processing unit 260 may be implemented by a processor. As shown in FIG. 17 , the UE 200 may include a processor 210 , a transmitter 230, a receiver 250 and a memory 270. Wherein, the memory 270 may be used to store codes executed by the processor 210 and the like.

Various components in the UE 200 are coupled together through a bus system 290, wherein the bus system 290 includes not only a data bus, but also a power bus, a control bus, and a status signal bus.

The UE 200 shown in FIG. 16 or the UE 200 shown in FIG. 17 can implement various processes performed by the UE in the foregoing method embodiments in FIGS. 1 to 13 . To avoid repetition, details are not repeated here.

Fig. 18 is a structural block diagram of a network device according to an embodiment of the present invention. The network device 300 shown in FIG. 18 may be the second network device 300 and may include a receiving unit 320 , a sending unit 340 and a processing unit 360 .

The receiving unit 320 is configured to receive the DCID and the time-frequency resource configuration of the uplink reference signal sent by the first network device, wherein the DCID is used by the first network device to identify the UE.

A sending unit 340, configured to send a first RRC configuration message to the UE, where the first RRC configuration message includes the DCID. The sending unit 340 is further configured to send a second RRC configuration message to the UE, where the second RRC configuration message includes the time-frequency resource configuration of the uplink reference signal, so that the UE according to the first RRC configuration message and the Send the uplink reference signal in the second RRC configuration message.

Optionally, the first network device in this embodiment of the present invention is a network device in a user-centric system, and the second network device is a network device in a network-centric system. For example, the first network device is the NR controller in the foregoing embodiment, and the second network device is the eNB in the foregoing embodiment. Correspondingly, the first network where the first network device is located may be NR. The present invention is not limited thereto.

Optionally, as an example, the receiving unit 320 may be further configured to receive a second measurement report sent by the UE, where the second measurement report includes the cell ID of the first network where the first network device is located. The sending unit 340 is further configured to send a measurement request to the first network device. The receiving unit 320 is further configured to receive a measurement response sent by the first network device, where the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal.

Optionally, as another example, the sending unit 340 may also be configured to send a measurement control message to the UE, so as to instruct the UE to perform inter-system measurement. The receiving unit 320 may also be configured to receive a second measurement report sent by the UE, where the second measurement report includes the cell ID of the first network where the first network device is located. The sending unit 340 is further configured to send a measurement request to the first network device. The receiving unit 320 is further configured to receive a measurement response sent by the first network device, where the measurement response includes the DCID and the time-frequency resource configuration of the uplink reference signal.

Wherein, the measurement request may include a handover threshold, or, the measurement request may include a handover threshold and a preset duration.

Optionally, as an embodiment, the processing unit 360 may be configured to, according to the first TA value between the second network device and the UE and the TA value between the second network device and the first network device The second TA value is to determine a third TA value between the UE and the first network device. The sending unit 340 is further configured to send the determined third TA value to the UE. It can be understood that the third TA value here is a TA value between the UE and the first network device.

Optionally, as another embodiment, the receiving unit 320 may be configured to receive the TA value sent by the first network device. The sending unit 340 may be configured to send the TA value to the UE.

Optionally, as another embodiment, the receiving unit 320 may be configured to receive a TA test instruction sent by the first network device. The sending unit 340 may be configured to send a TA test instruction to the UE, to instruct the UE to send a TA test message to the first network device. Further, the receiving unit 320 may be configured to receive the TA value sent by the first network device. The sending unit 340 may be configured to send the TA value to the UE. Wherein, the TA value may be determined by the first network device based on the TA test message.

Wherein, the TA value sent by the sending unit 340 may be included in the second RRC configuration message. That is to say, the sending unit 340 may send the second RRC configuration message to the UE, where the second RRC configuration message includes the time-frequency resource configuration and the TA value of the uplink reference signal.

In addition, as another implementation manner, the first RRC configuration message and the second RRC configuration message are the same message. It can be seen that the first RRC configuration message may include the DCID and the time-frequency resource configuration of the uplink reference signal; or, the first RRC configuration message may include the DCID, the time-frequency resource configuration of the uplink reference signal and the TA value.

Optionally, in this embodiment of the present invention, the receiving unit 320 may also be configured to receive handover instruction information sent by the first network device, where the handover instruction message includes The identity of the second node. The sending unit 340 may also be configured to send a handover command to the UE according to the handover instruction information, where the handover command includes the identifier of the second node, and the handover command is used to indicate that the UE is connected to the second node. The two nodes perform data transmission.

Wherein, the handover instruction message may further include: transmission resource information configured by the first network device for the UE, and/or a new ID allocated by the first network device for the UE.

It should be noted that in this embodiment of the present invention, the receiving unit 320 may be implemented by a receiver, the sending unit 340 may be implemented by a transmitter, and the processing unit 360 may be implemented by a processor. As shown in FIG. 19 , the network device 300 may include a processor 310 , transmitter 330 , receiver 350 and memory 370 . Wherein, the memory 370 may be used to store codes executed by the processor 310 and the like.

Various components in the network device 300 are coupled together through a bus system 390, wherein the bus system 390 includes not only a data bus, but also a power bus, a control bus and a status signal bus.

The network device 300 shown in FIG. 18 or the network device 300 shown in FIG. 19 can implement the various processes performed by the eNB or the second network device in the method embodiments in FIGS. 1 to 13. To avoid repetition, details are not repeated here. .

FIG. 20 is a schematic structural diagram of a system chip according to an embodiment of the present invention. The system chip 400 in FIG. 20 includes an input interface 410, an output interface 420, at least one processor 430, and a memory 440. The input interface 410, the output interface 420, the processor 430, and the memory 440 are connected through a bus, and the The processor 430 is configured to execute the codes in the memory 440. When the codes are executed, the processor 430 implements the method executed by the NR controller or the first network device in FIGS. 1-10.

Fig. 21 is a schematic structural diagram of a system chip according to an embodiment of the present invention. The system chip 500 in FIG. 21 includes an input interface 510, an output interface 520, at least one processor 530, and a memory 540. The input interface 510, the output interface 520, the processor 530, and the memory 540 are connected by a bus, and the The processor 530 is configured to execute the codes in the memory 540. When the codes are executed, the processor 530 implements the methods performed by the UE in FIGS. 1-10.

Fig. 22 is a schematic structural diagram of a system chip according to an embodiment of the present invention. The system chip 600 in FIG. 22 includes an input interface 610, an output interface 620, at least one processor 630, and a memory 640. The input interface 610, the output interface 620, the processor 630, and the memory 640 are connected through a bus, and the The processor 630 is configured to execute the codes in the memory 640. When the codes are executed, the processor 630 implements the method executed by the eNB or the second network device in FIG. 1-10.

The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (29)

1. A method for cell handover, comprising:

a first network device sends a Dedicated Connection Identification (DCID) to a second network device of a current serving cell of User Equipment (UE), so that the second network device forwards the DCID to the UE, wherein the DCID is used for identifying the UE by the first network device;

the first network device sends the time-frequency resource configuration of the uplink reference signal to the second network device, so that the second network device forwards the time-frequency resource configuration of the uplink reference signal to the UE;

the first network device sends a switching indication message to the second network device, where the switching indication message includes an identifier of a second node in a first network where the first network device is located, so that the UE performs data transmission with the second node.

2. The method of claim 1, further comprising, before the first network device sends a handover indication message to the second network device:

the first network equipment sends a measurement indication message to a first node, and indicates the first node to measure an uplink reference signal sent by the UE, wherein the measurement indication message carries the DCID and/or the time-frequency resource configuration of the uplink reference signal;

the first network equipment receives a first measurement report sent by the first node, wherein the first measurement report carries a measurement result of the uplink reference signal sent by the UE;

and the first network equipment allocates the second node for the UE according to the first measurement report of the first node.

3. The method of claim 2, wherein the first network device allocates the second node to the UE according to the first measurement report of the first node, comprising:

the first network equipment judges whether the measurement result carried by a first measurement report of the first node meets a switching threshold or not;

if the measurement result carried by the first measurement report of the first node meets the switching threshold, the first network equipment allocates the second node for the UE,

wherein the handover threshold is received by the first network device from the second network device.

4. The method according to any one of claims 1 to 3,

before the first network device sends the DCID to the second network device of the current serving cell of the UE, the method further includes:

the first network equipment receives a measurement request sent by the second network equipment;

wherein the DCID and the time-frequency resource configuration of the uplink reference signal are included in a measurement response corresponding to the measurement request.

5. The method according to any of claims 1 to 4, wherein the handover indication message further comprises:

the first network device allocates transmission resource information for the UE, and/or allocates a new ID to the UE.

6. The method according to any of claims 1 to 5, further comprising, before the first network device sends a handover indication message to the second network device:

the first network equipment sends a TA test instruction to the second network equipment so that the second network equipment instructs the UE to send a TA test message;

the first network equipment receives the TA test message sent by the UE;

the first network equipment determines a TA value according to the TA test message;

and the first network equipment sends the TA value to the UE.

7. The method of claim 6, wherein the first network device sending the TA value to the UE comprises:

the first network device sends the TA value to the second network device, so that the second network device forwards the TA value to the UE.

8. A method for cell handover, comprising:

user Equipment (UE) receives a first Radio Resource Control (RRC) configuration message sent by second network equipment of a current serving cell, wherein the first RRC configuration message comprises a Dedicated Connection Identifier (DCID), and the DCID is used for identifying the UE by the first network equipment;

the UE receives a second RRC configuration message sent by the second network equipment, wherein the second RRC configuration message comprises time-frequency resource configuration of an uplink reference signal;

the UE sends an uplink reference signal according to the first RRC configuration message and the second RRC configuration message;

the UE receives a switching command sent by the second network equipment, wherein the switching command comprises an identifier of a second node distributed to the UE by the first network equipment;

and the UE performs data transmission with the second node according to the switching command.

9. The method of claim 8, wherein before the UE receives the first RRC configuration message sent by the second network device of the current serving cell, the method further comprises:

the UE in the service range of the second network equipment performs inter-system detection;

the UE generates a second measurement report according to the result of the inter-system detection, wherein the second measurement report comprises the cell ID of the first network in which the first network equipment is located;

the UE sends the second measurement report to the second network device.

10. The method of claim 9, wherein the UE performs inter-system detection, comprising:

the UE receives a measurement control message sent by the second network equipment;

and the UE executes the inter-system measurement according to the measurement control message.

11. The method of claim 9 or 10, wherein the UE performs inter-system detection, comprising:

the UE executes inter-system detection and detects at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) sent by a first node in the first network, a downlink reference signal of the first network and System Information (SI).

12. The method according to any of claims 8 to 11, wherein before the UE transmits uplink reference signals according to the first RRC configuration message and the second RRC configuration message, the method further comprises:

the UE sends a TA test message to the first network equipment;

and the UE receives the TA value sent by the first network equipment.

13. The method of claim 12,

the TA value is included in the second RRC configuration message.

14. The method according to any of claims 8 to 11, wherein before the UE transmits uplink reference signals according to the first RRC configuration message and the second RRC configuration message, the method further comprises:

and the UE receives the TA value sent by the second network equipment.

15. The method according to any of claims 8 to 14, wherein the first RRC configuration message and the second RRC configuration message are the same message.

16. A method for cell handover, comprising:

a second network device receives a dedicated connection identifier DCID and time-frequency resource configuration of an uplink reference signal, wherein the DCID is used for identifying User Equipment (UE) by a first network device;

the second network device sending a first radio resource control, RRC, configuration message to the UE, the first RRC configuration message including the DCID;

and the second network equipment sends a second RRC configuration message to the UE, wherein the second RRC configuration message comprises time-frequency resource configuration of the uplink reference signal, so that the UE sends the uplink reference signal according to the first RRC configuration message and the second RRC configuration message.

17. The method of claim 16, further comprising:

the second network equipment determines a third TA value between the UE and the first network equipment according to a first TA value between the second network equipment and the UE and a second TA value between the second network equipment and the first network equipment;

the second network equipment sends the determined third TA value to the UE.

18. The method of claim 16, further comprising:

the second network equipment receives the TA value sent by the first network equipment;

and the second network equipment sends the TA value to the UE.

19. The method of claim 18, wherein the TA value is included in the second RRC configuration message.

20. The method according to any of claims 16 to 19, wherein the first RRC configuration message and the second RRC configuration message are the same message.

21. The method according to claim 16 or 19, wherein before the second network device receives the TA value sent by the first network device, further comprising:

and the second network equipment sends a Timing Advance (TA) test instruction to the UE to indicate the UE to send a TA test message to the first network equipment.

22. The method according to any one of claims 16 to 21,

the receiving, by the second network device, the time-frequency resource configuration of the DCID and the uplink reference signal sent by the first network device includes:

the second network equipment receives a second measurement report sent by the UE, wherein the second measurement report comprises a cell ID of a first network in which the first network equipment is located;

the second network device sends a measurement request to the first network device;

and the second network equipment receives a measurement response sent by the first network equipment, wherein the measurement response comprises the DCID and the time-frequency resource configuration of the uplink reference signal.

23. The method of claim 22, wherein the measurement request comprises a handover threshold, or wherein the measurement request comprises a handover threshold and a preset duration.

24. The method according to claim 22 or 23, wherein before the second network device receives the second measurement report sent by the UE, further comprising:

and the second network equipment sends a measurement control message to the UE to indicate the UE to carry out inter-system measurement.

25. The method of any one of claims 16 to 24, further comprising:

the second network equipment receives switching indication information sent by the first network equipment, wherein the switching indication information comprises an identifier of a second node in a first network where the first network equipment is located;

and the second network equipment sends a switching command to the UE according to the switching indication information, wherein the switching command comprises the identifier of the second node, and the switching command is used for indicating the UE to perform data transmission with the second node.

26. The method of claim 25, wherein the handover indication message further comprises:

the first network device allocates transmission resource information for the UE, and/or allocates a new ID to the UE.

27. A network device, comprising: a memory and a processor, wherein the processor is capable of,

the memory is used for storing instructions executed by the processor;

the processor is configured to execute the instructions to implement the method of any one of claims 1 to 7.

28. A user device, comprising: a memory and a processor, wherein the processor is capable of,

the memory is used for storing instructions executed by the processor;

the processor is configured to execute the instructions to implement the method of any one of claims 8 to 15.

29. A network device, comprising: a memory and a processor, wherein the processor is capable of,

the memory is used for storing instructions executed by the processor;

the processor is configured to execute the instructions to implement the method of any one of claims 16 to 26.