CN112312491A

CN112312491A - Data forwarding method and equipment

Info

Publication number: CN112312491A
Application number: CN201910709031.7A
Authority: CN
Inventors: 苗金华; 许萌
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2021-02-02

Abstract

The invention provides a data forwarding method and equipment, which are used for solving the problems of data forwarding time delay and long data interruption time in the existing switching process. The invention comprises the following steps: the source cell sends a conditional switching command to the terminal; and the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell. After a source cell sends a conditional switch command to a terminal, a data packet of the terminal is sent to a target cell before the terminal is switched to the target cell, the source cell does not receive indication information returned by the target cell after the terminal is successfully switched to the target cell and carries out data forwarding, but sends the data packet of the terminal to the target cell before the terminal is switched to the target cell, data forwarding is carried out in advance, and the time of data interruption is reduced.

Description

Data forwarding method and equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for data forwarding.

Background

Data Forwarding (Data Forwarding) is in an RLC AM (Radio Link Control Acknowledged Mode), in order to ensure that no Packet is lost, in a handover process, after a source cell determines that a terminal is handed over to a target cell, the source cell sends DL PDCP SDUs (Data Link Packet Data Convergence Protocol Service Data Units) that are not confirmed by the terminal to the target cell to which the terminal is handed over, and also forwards some Data that has just arrived at the source cell from a core network and is not allocated with an SN (Sequence Number) Number, so as to ensure continuity of the Data.

However, in the current data forwarding, after the terminal is successfully switched to establish a connection with the target cell, the target cell sends indication information to the source cell, and after the source cell determines that the terminal accesses the target cell, the data forwarding process is executed and communication with the terminal is stopped. At this time, the time delay of data forwarding performed by the source cell causes an increase in data interruption time.

Disclosure of Invention

The embodiment of the invention provides a data forwarding method and equipment, which are used for solving the problems of data forwarding time delay and long data interruption time in the existing switching process.

In a first aspect, an embodiment of the present invention provides a method for data forwarding, where the method includes:

the source cell sends a conditional switching command to the terminal;

and the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

In the method, after the source cell sends the conditional switch command to the terminal, the data packet of the terminal is sent to the target cell before the terminal is switched to the target cell, and the data forwarding is performed after the source cell receives the indication information returned by the target cell instead of after the terminal is successfully switched to the target cell.

In a possible implementation manner, before a source cell sends a data packet of a terminal to a target cell, the source cell receives indication information containing a target cell identifier sent by the terminal;

and when the source cell sends the data packet of the terminal to the target cell, sending the data packet of the terminal to the target cell corresponding to the target cell identifier.

In the method, after receiving the indication information containing the target cell identifier sent by the terminal, the source cell sends the data packet of the terminal to the target cell corresponding to the target cell identifier carried in the received indication information, before the source cell sends the indication information to the target cell, the source cell can accurately determine the data packet of the terminal sent to the target cell, and data forwarding is carried out to the corresponding target cell in advance, so that the problem of long data interruption time caused by delayed data forwarding time is avoided, and meanwhile, after receiving the indication information containing the target cell identifier sent by the terminal, the source cell can also determine that the communication with the terminal is interrupted, so that the problem of data loss caused by the fact that when the communication with the terminal is interrupted is not clear in the source cell is avoided.

In one possible implementation manner, the indication information includes:

preamble information, Radio Resource Control (RRC) signaling, or MAC CE (media access Control Element).

In a possible implementation manner, if the indication information is Preamble information, when the source cell receives the indication information including the target cell identifier sent by the terminal: the source cell receives the indication information on a time-frequency domain resource position configured for the terminal and used for sending Preamble information; or

If the indication information is RRC signaling or MAC CE, when the source cell receives the indication information which is sent by the terminal and contains the target cell identifier: the source cell receives the indication information at a reserved UL (Up Link) resource location configured for the terminal.

In the method, the explicit indication information comprises Preamble information or RRC or MAC CE; and simultaneously, when the indication information is Preamble information, the indication information is RRC or the indication information is MAC CE, the source cell receives the indication information sent by the terminal, so that the source cell can accurately receive the indication information sent by the terminal, further the target cell identifier in the indication information is determined, the data packet of the terminal is sent to the target cell corresponding to the target cell identifier, and data forwarding is carried out in advance.

In a possible implementation manner, after a source cell determines that a terminal needs to perform cell handover, before sending a data packet of the terminal to a target cell, if the source cell does not receive data sent by the terminal within a set time duration, the data packet of the terminal is sent to all candidate target cells, where the candidate target cells include the target cell.

The method includes that after a source cell does not receive data sent by a terminal within a set time length, a data packet of the terminal is sent to all alternative target cells, after the source cell does not receive the data sent by the terminal within the set time length, communication interruption between the terminal and the source cell is determined, namely the terminal needs to perform cell switching, and as the source cell does not know which cell the terminal needs to be switched to, the data packet of the terminal is sent to all the alternative target cells in advance, data forwarding is performed in advance, and the problem of long data interruption time caused by data forwarding time delay is avoided; meanwhile, after the source cell cannot receive the data sent by the terminal within the set time length, the source cell determines that the communication with the terminal is interrupted, and the problem of data loss caused by the fact that the source cell does not know when the communication with the terminal is interrupted is avoided.

In a possible implementation manner, a source cell sends a data packet of a terminal to an alternative target cell, and in the process of sending the data packet, if a rejection message returned by the alternative target cell is received, the source cell stops sending the data packet of the terminal to the alternative target cell returning the rejection message; or

And in the process of sending the data packet, if receiving the confirmation information returned by the alternative target cell, the source cell stops sending the data packet of the terminal to the alternative target cells except the alternative target cell returning the confirmation information.

In the method, when a source cell sends data packets of terminals to all alternative target cells, if a rejection message returned by the alternative target cells is received, the source cell stops sending the data packets of the terminals to the alternative target cells returning the rejection message, or if a confirmation message returned by the alternative target cells is received, the source cell stops sending the data packets of the terminals to the alternative target cells except the alternative target cells returning the confirmation message; the terminal can only be switched to one target cell in the switching process, so that the source cell can ensure that the data packet of the terminal is sent to the target cell switched by the terminal when the data packet of the terminal is sent, the data packet of the terminal is not needed to be sent to other target cells, the data transmission quantity is reduced, and the storage resources of other target cells are saved.

In a second aspect, an embodiment of the present invention provides a method for data forwarding, where the method includes:

the terminal determines a target cell according to a conditional switching command sent by a source cell;

and the terminal sends the target cell information to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

In the method, the terminal determines the target cell according to the conditional switch command sent by the source cell and sends the target cell to the source cell, so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell, and the source cell executes data forwarding to the target cell in advance according to the target cell sent by the terminal, thereby avoiding the problem of long data interruption time caused by delayed data forwarding time.

In one possible implementation, when the terminal sends the target cell information to the source cell: and the terminal sends the indication information containing the target cell identification to the source cell.

In one possible implementation, the indication information includes: preamble information or RRC signaling or MAC CE.

In a possible implementation manner, if the indication information is Preamble information, when the terminal sends the indication information including the target cell identifier to the source cell: the terminal sends indication information on a time-frequency domain resource position configured in a source cell and used for sending Preamble information; or

If the indication information is RRC signaling or MAC CE, the terminal sends the indication information containing the target cell identification to the source cell: and the terminal sends the indication information on the reserved UL resource position configured by the source cell.

In the method, when the terminal notifies the source cell of the target cell to be switched to, the terminal carries the target cell identifier in the indication information and sends the indication information to the source cell, wherein the indication information includes: and when Preamble information or RRC signaling or MAC CE is given, and indication information is the Preamble information, the indication information is the RRC signaling and the indication information is the MAC CE, how the terminal sends the indication information to the source cell is ensured, the terminal can smoothly send the indication information to the source cell, so that after the source cell receives the indication information sent by the terminal, the target cell is determined according to the target cell identifier in the indication information, and a data packet of the terminal is further sent to the target cell.

In a third aspect, an embodiment of the present invention provides a method for data forwarding, where the method includes:

and if the alternative target cell confirms that the alternative target cell is the target cell for the terminal to perform cell switching, after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so that the source cell stops sending the data packet of the terminal to the alternative target cells except the target cell.

In a possible implementation manner, if the candidate target cell determines that the candidate target cell is not the target cell for cell switching by the terminal, after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell, the candidate target cell returns a rejection message to the source cell, so that the source cell stops sending the data packet of the terminal to the candidate target cell.

In the method, the alternative target cell returns a confirmation message to the source cell after confirming that the alternative target cell is the target cell switched by the terminal in the process of receiving the data packet of the terminal sent by the source cell, or returns a rejection message to the source cell after confirming that the alternative target cell is not the target cell switched by the terminal, so that the source cell is ensured to send the data packet of the terminal to the target cell switched by the terminal, data forwarding is performed in advance, meanwhile, the data packet of the terminal is prevented from being sent to the target cell not switched by the terminal, data transmission is reduced, and storage resources of the target cell not switched by the terminal are saved.

In a fourth aspect, an embodiment of the present invention provides an apparatus for data forwarding, where the apparatus includes: a processor, a memory, and a transceiver;

a processor for reading the program in the memory and performing the following processes:

sending a condition switching command to the terminal; and before the terminal is switched to the target cell, sending a data packet of the terminal to the target cell.

In a fifth aspect, an embodiment of the present invention provides an apparatus for data forwarding, where the apparatus includes: a processor, a memory, and a transceiver;

determining a target cell according to a conditional switching command sent by a source cell; and sending the target cell information to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

In a sixth aspect, an embodiment of the present invention provides an apparatus for data forwarding, where the apparatus includes: a processor, a memory, and a transceiver;

if the terminal is confirmed to be the target cell for cell switching by the terminal, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to alternative target cells except the target cell; or

And if the terminal is not the target cell for cell switching by the terminal, returning a rejection message to the source cell after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell so that the source cell stops sending the data packet of the terminal to the alternative target cell.

In a seventh aspect, an embodiment of the present invention provides a device for data forwarding, where the device includes: the system comprises a first sending module and a second sending module;

the first sending module is used for: sending a condition switching command to the terminal;

the second sending module is used for: and before the terminal is switched to the target cell, sending a data packet of the terminal to the target cell.

In an eighth aspect, an embodiment of the present invention provides an apparatus for data forwarding, where the apparatus includes: the first determining module and the third sending module;

the first determining module is to: determining a target cell according to a conditional switching command sent by a source cell;

the third sending module is used for: and sending the target cell to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

In a ninth aspect, an embodiment of the present invention provides an apparatus for data forwarding, where the apparatus includes: a confirmation module;

the confirmation module is to: if the terminal is confirmed to be the target cell for cell switching by the terminal, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to alternative target cells except the target cell; or

The confirmation module is to: and if the terminal is not the target cell for cell switching by the terminal, returning a rejection message to the source cell after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell so that the source cell stops sending the data packet of the terminal to the alternative target cell.

In a tenth aspect, an embodiment of the present invention provides a computer storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements any of the aspects of the first aspect, the second aspect, or the third aspect.

In addition, for technical effects brought by any one implementation manner of the fourth aspect to the tenth aspect, reference may be made to technical effects brought by different implementation manners of the first aspect and the third aspect, and details are not described here.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flowchart of a terminal performing cell handover in the prior art;

fig. 2 is a system structure diagram of data forwarding provided in the embodiment of the present invention;

fig. 3 is a flowchart of a source cell forwarding data according to indication information according to an embodiment of the present invention;

fig. 4 is a flowchart of data forwarding performed by a source cell according to a behavior of a terminal according to an embodiment of the present invention;

fig. 5 is a flowchart of data forwarding performed by another source cell according to the behavior of the terminal according to the embodiment of the present invention;

fig. 6 is a structural diagram of a first data forwarding apparatus according to an embodiment of the present invention;

fig. 7 is a structural diagram of a second data forwarding apparatus according to an embodiment of the present invention;

fig. 8 is a structural diagram of a third apparatus for data forwarding according to an embodiment of the present invention;

fig. 9 is a structural diagram of a fourth data forwarding apparatus according to an embodiment of the present invention;

fig. 10 is a diagram of a fifth apparatus for data forwarding according to an embodiment of the present invention;

fig. 11 is a flowchart of a first data forwarding method according to an embodiment of the present invention;

fig. 12 is a flowchart of a second method for forwarding data according to an embodiment of the present invention.

Detailed Description

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

(1) In the embodiments of the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning.

(2) In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

(3) "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

When a terminal switches cells at present, the terminal executes RRM (Radio Resource Management) measurement, and when a trigger condition is met, a measurement report is reported to a source cell, the source cell selects a target cell which can be switched by the terminal according to the measurement report reported by the terminal, and sends a condition switching request to the determined target cell, determines whether the target cell can accept terminal switching, and after the target cell determines that the terminal switching can be accepted, sends a switching request response message to the source cell. The method comprises the steps that a source cell sends a plurality of target cells capable of accepting terminal switching to a terminal, meanwhile, a condition for triggering switching is sent to the terminal, when the terminal meets the condition switching, one target cell is selected from the target cells capable of accepting terminal switching sent by the source cell to carry out cell switching, after the target cell switching is successful, the target cell switched by the terminal sends indication information to the source cell, the source cell sends a data packet of the terminal to the target cell switched by the terminal, and communication between the source cell and the terminal is stopped.

As shown in fig. 1, a process of performing cell handover for a current terminal specifically includes the following steps:

step 100, a source cell sends measurement control to a terminal;

step 101, a terminal reports a measurement report to a source cell;

step 102, after a source cell receives a measurement report of a terminal, determining a target cell 1 and a target cell 2 which can be switched by the terminal based on a history report;

103, the source cell sends a switching request to the determined target cell 1 and the target cell 2;

104, after receiving a switching request sent by a source cell, a target cell 1 and a target cell 2 determine whether the target cell can accept terminal switching;

step 105, the target cell 1 and the target cell 2 return a conditional switch request response to the source cell after determining that the terminal can be accepted for switching;

step 106, the source cell sends a conditional switching command containing a target cell 1 and a target cell 2 to the terminal;

step 107, the terminal determines that the target cell 1 meets the switching condition according to the conditional switching command;

the terminal receives a conditional switching command which comprises a target cell 1 and a target cell 2, further determines whether the target cell 1 or the target cell 2 meets the switching condition, and switches to the target cell 1 if the target cell 1 meets the switching condition;

step 108, the terminal and the target cell 1 execute the switching access process;

step 109, the terminal notifies the target cell 1 of the completion of the handover;

step 110, the target cell 1 sends indication information of successful terminal switching to the source cell;

step 111, after receiving the indication information sent by the target cell 1, the source cell performs data forwarding to the target cell 1, and sends the data packet of the terminal to the target cell 1.

Based on the above-mentioned process of cell switching by the terminal, it can be known that the source cell performs data forwarding to the target cell to which the terminal is switched only after receiving the indication information that the terminal is successfully switched to itself and sent by the target cell, and the data interruption is increased due to the time delay of the source cell performing the data forwarding. And the source cell determines that the communication with the terminal is interrupted when receiving the indication information of the target cell, but the interruption of the communication between the source cell and the terminal actually occurs when the terminal performs cell switching, so that it is clear that the source cell does not know when the source cell is disconnected with the terminal, data loss is caused, and retransmission is increased.

Therefore, the data forwarding is performed according to the indication information sent by the target cell after the source cell receives the successful handover of the terminal to the target cell, which causes data forwarding delay, and the source cell does not know when the communication with the terminal is interrupted, which causes data loss. The invention provides a scheme for forwarding data in a switching process, which comprises the following steps: the source cell sends a conditional switching command to the terminal, sends a data packet of the terminal to the target cell before the terminal is switched to the target cell, and forwards data before the terminal is switched to the target cell, and sends the data packet of the terminal to the target cell to prevent data interruption. And meanwhile, the source cell also determines whether the terminal is in communication interruption with the source cell according to the indication information of the terminal or the behavior of the terminal, and the source cell can determine when the communication is interrupted with the terminal, so that data loss caused by communication interruption is further prevented.

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 2, the system for data forwarding provided in the embodiment of the present invention includes a source cell 21, a terminal 22, and an alternative target cell 23;

the source cell 21 is configured to: sending a condition switching command to the terminal; and before the terminal is switched to a target cell, sending a data packet of the terminal to the target cell.

The terminal 22 is configured to: the terminal determines a target cell according to a conditional switching command sent by a source cell; and sending the target cell information to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

The candidate target cell 23 is configured to: if the terminal is confirmed to be the target cell for cell switching by the terminal, after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to the alternative target cell except the target cell.

In the method, the source cell determines that the terminal needs to perform cell switching, the data packet of the terminal is sent to the target cell before the terminal is switched to the target cell, the source cell performs data forwarding before the terminal is switched to the target cell, and the data forwarding is not performed after the terminal is switched to the target cell, so that the problem of long data interruption time caused by delay of data forwarding time is avoided.

In this embodiment of the present invention, the data packet of the terminal is: the core network sends the PDCP SDU to the source cell and the PDCP SDU which is not correctly fed back by the terminal;

the alternative target cell is a cell which can be switched by the terminal in the process that the source cell configures the conditional switching command information for the terminal;

the target cell is a cell to which the terminal performs cell handover, i.e., a cell to which the terminal successfully performs handover.

In the embodiment of the present invention, before the source cell sends the data packet of the terminal to the target cell, the source cell determines that the terminal is to perform cell switching. The source cell determines that the terminal needs to perform cell switching by the following modes:

the first method is as follows: when a terminal needs to perform cell handover, it sends indication information to a source cell, where the indication information carries a target cell identifier to be handed over by the terminal, where the target cell identifier may be a target cell ID (Identity), such as PCI (Peripheral Component Interconnect, Peripheral Component Interconnect standard) information.

After receiving the indication information sent by the terminal, the source cell determines that the terminal needs to perform cell switching, determines a target cell to which the terminal needs to be switched according to a target cell identifier in the indication information, and sends a data packet of the terminal to the target cell.

The second method comprises the following steps: and the source cell determines that the terminal needs to perform cell switching according to the behavior of the terminal.

When the terminal executes the cell, the terminal disconnects communication with the source cell, the source cell does not receive the data sent by the terminal, and when the source cell does not receive the data of the terminal within the set time, the terminal is determined to perform cell switching, and the data packet of the terminal is sent to all the alternative target cells.

The candidate target cell is selected to be capable of accepting the terminal handover after the source cell receives the measurement report of the terminal.

The scheme for data forwarding is illustrated in connection with the following examples.

The first embodiment is as follows: the source cell determines data forwarding according to the indication information sent by the terminal, and when the terminal performs cell switching, the terminal informs the source cell terminal of a target cell for cell switching by sending the indication information to the source cell.

Wherein the indication information includes: preamble (Preamble) information or RRC signaling or MAC CE.

The first condition is as follows: the indication information is Preamble information.

In the embodiment of the invention, a source cell sends measurement control information to a terminal;

correspondingly, the terminal returns a measurement report to the source cell, and the source cell selects a target cell which can be switched by the terminal after receiving the measurement report of the terminal, and sends switching request information to the selected target cell which can be switched;

the target cell capable of carrying out switching determines whether the target cell can accept the terminal switching according to the switching request information of the source cell, and returns a switching request response message to the source cell after determining that the target cell can accept the terminal switching;

the method comprises the steps that a source cell determines an alternative target cell according to a switching request response message, the source cell carries the alternative target cell in conditional switching command information and sends the conditional switching command information to a terminal, when the terminal switches cells, one target cell meeting switching conditions is selected from the alternative target cells sent by the source cell, Preamble information corresponding to the target cell is sent to the source cell, the source cell determines the target cell switched by the terminal after receiving the Preamble information, and a data packet of the terminal is sent to the target cell switched by the terminal. And after determining a target cell for the terminal to switch, the source cell disconnects the communication with the terminal, and the source cell knows when the communication with the terminal is interrupted, so that the data loss is prevented.

Fig. 3 is a flowchart illustrating that a source cell performs data forwarding according to indication information in an embodiment of the present invention.

Step 300, the source cell sends measurement control information to the terminal.

In step 301, the terminal performs RRM measurement and returns a measurement report to the source cell.

Step 302, after the source cell receives the measurement report returned by the terminal, the target cell to which the terminal can be switched is determined.

Step 303, the source cell sends a handover request message to the target cell for which the determined terminal can perform handover;

in practical application, the source cell determines at least one target cell to which the terminal can be switched, for example, the source cell determines that the target cell to which the terminal can be switched includes a target cell 1, a target cell 2 and a target cell 3;

at this time, the source cell sends handover request information to the target cells 1, 2 and 3, for requesting whether the target cells 1, 2 and 3 can accept terminal handover.

Step 304, the target cell which can be switched by the terminal carries out admission control according to the switching request information sent by the source cell;

at this time, the target cell 1, the target cell 2, and the target cell 3 receive the handover request information sent by the source cell, and the target cell 1, the target cell 2, and the target cell 3 perform admission control according to the handover request information to determine whether to admit the terminal for handover.

Step 305, after determining that the terminal is admitted to the target cell for switching, the target cell capable of switching by the terminal sends a switching request response message to the source cell;

for example, the target cell 1 and the target cell 2 accommodate terminal switching, and the target cell 1 and the target cell 2 send a switching request response message to the source cell, so that the source cell determines an alternative target cell accommodating terminal switching according to the switching request response message, where the alternative target cell includes the target cell 1 and the target cell 2;

if the target cell 3 does not accept the terminal switching, the target cell 3 may not return a message to the source cell, or return a negative message to the source cell, so that the source cell determines that the target cell 3 cannot be used as the alternative target cell, that is, the terminal cannot be switched to the target cell 3;

it should be noted that target cell 1 and target cell 2 may not return a message, but target cell 3 returns a negative message; or the target cell 1 and the target cell 2 return response messages, but the target cell 3 does not return messages; or the target cell 1 and the target cell 2 return a response message, the target cell 3 returns a negative message, and so on, so that the source cell determines to admit the candidate target cell switched by the terminal, which is determined specifically by how to configure, and is not described herein again.

Step 306, the source cell determines an alternative target cell according to the received switching request response message;

after receiving the switching request response messages of the target cell 1 and the target cell 2, the source cell determines that the target cell 1 and the target cell 2 are cells for accepting terminal switching, and takes the target cell 1 and the target cell 2 as alternative target cells.

Step 307, the source cell configures the conditional handover command information carrying the candidate target cell to the terminal.

In practical applications, the configured conditional switch command information (referred to as configuration information) includes, but is not limited to, the following information: the candidate target cell information is accessed to Preamble information (hereinafter referred to as first Preamble information) used by the candidate target cell, and the source cell terminal is notified of the Preamble information (hereinafter referred to as second Preamble information) when performing handover, where the second Preamble information includes: index information of the second Preamble information, and/or time-frequency domain resources used for sending the second Preamble information.

When a source cell configures a plurality of candidate target cells for a terminal, configuring second Preamble information corresponding to the plurality of candidate target cells at the same time, for example, second Preamble1 information corresponding to target cell 1 in the candidate target cells; and the target cell 2 in the candidate target cells corresponds to the second Preamble2 information and the like.

308, the terminal determines a target cell meeting the switching condition, and determines Preamble information corresponding to the target cell meeting the switching condition according to the mapping relation in the configuration information;

in practical application, after receiving configuration information of a source cell, when it is determined that handover is required, a terminal selects a target cell meeting handover conditions from candidate target cells carried in the configuration information to perform handover, and determines second Preamble information corresponding to the candidate target cell according to a corresponding relationship between the candidate target cell and the second Preamble information in the configuration information.

For example, the terminal determines that the target cell for handover is the target cell 1, and at this time, determines the second Preamble1 information corresponding to the target cell 1 according to the mapping relationship.

Step 309, the terminal sends the second Preamble1 information to the source cell;

in practical application, the terminal sends the second Preamble information according to the time-frequency domain resource location used for sending the second Preamble information in the configuration information of the source cell.

And the terminal determines to switch to the target cell 1, so that the terminal sends the second Preamble1 information on the time-frequency domain resource location for sending the second Preamble information.

310, the source cell receives the second Preamble1 information sent by the terminal, and determines the target cell according to the received second Preamble1 information;

in practical application, a source cell receives second Preamble information at a time-frequency domain resource position configured for the terminal and used for sending the Preamble information;

specifically, the source cell receives the second Preamble1 information at the time-frequency domain resource location configured for the terminal and used for sending the Preamble information.

After the second Preamble1 information is determined, it is determined that the second Preamble1 information corresponds to the target cell 1 according to the mapping relationship configured for the terminal, so that the source cell determines that the terminal is switched to the target cell 1.

Step 311, the source cell sends the data packet of the terminal to the target cell 1.

After determining that the terminal is to be switched to the target cell 1, the source cell sends a data packet of the terminal to the target cell 1, and performs data forwarding.

In step 312, the source cell sends information for canceling the terminal handover to the candidate target cells except the target cell 1 where the terminal performs the handover.

And after determining that the terminal is to be switched to the target cell 1, the source cell sends information for canceling the terminal switching to the target cell 2.

Correspondingly, the target cell 2 will return the information for confirming the cancellation of the terminal switching to the terminal, so the source cell will receive the information for confirming the cancellation of the terminal switching returned by the target cell 2.

Step 313, the source cell receives the information of confirming the cancel of the terminal switch returned by the alternative target cells except the target cell 1 of the terminal switch.

In step 314, the terminal and the target cell 1 execute the access process of handover.

Step 315, the terminal sends the information of switching completion to the target cell 1.

In step 316, the target cell 1 sends a secondary base station status request to the source cell.

Step 317, the source cell returns the state information of the auxiliary base station to the target cell 1.

It should be noted that the order between step 312 and step 315 may be changed, but it is ensured that the process performed in step 312 precedes step 313, and the process performed in step 314 precedes step 315.

Case two: the indication information is RRC signaling.

The source cell sends measurement control information to the terminal.

The terminal returns a measurement report to the source cell.

And the source cell receives the measurement report returned by the terminal, selects a target cell which can be switched by the terminal after receiving the measurement report of the terminal, and sends switching request information to the selected target cell which can be switched.

The target cell capable of carrying out switching determines whether the target cell can accept the terminal switching according to the switching request information of the source cell, and returns a switching request response message to the source cell after determining that the target cell can accept the terminal switching.

The source cell receives the handover request response message, determines the candidate target cell according to the handover request response message, and sends the candidate target cell to the terminal (the above contents are not described in detail, and it can be seen that the case one in the first embodiment is specific);

when the source cell sends the candidate target cell to the terminal, the source cell configures conditional handover command information to the terminal, where the configured conditional handover command information includes, but is not limited to, part or all of the following:

information of the candidate target cell, UL resources reserved by the source cell, MCS (Modulation and coding scheme) information, pilot information, a period of reserving UL resources, and the like.

When the terminal switches the cells, a target cell meeting the switching condition is selected according to the alternative target cell in the conditional switching command information configured by the source cell, and the target cell identifier is sent to the source cell through RRC signaling, wherein the target cell identifier can be ID information of the target cell;

in the embodiment of the invention, when a terminal sends a target cell identifier to a source cell through an RRC signaling, the terminal sends the RRC signaling carrying the target cell identifier on a reserved UL resource position configured by the source cell;

and the RRC signaling carrying the target cell identifier has the highest priority in the multiplexing process.

A source cell receives an RRC signaling which is sent by a terminal and carries a target cell identifier, and a target cell switched by the terminal is determined according to the target cell identifier;

and the source cell receives the RRC signaling carrying the target cell identification at a reserved UL resource position configured for the terminal.

After determining a target cell to which the terminal performs switching according to the target cell identifier, the source cell sends a data packet of the terminal to the target cell to which the terminal performs switching; and after determining a target cell for the terminal to switch, the source cell disconnects the communication with the terminal, and the source cell knows when the communication with the terminal is interrupted, so that the data loss is prevented.

Case three: the indication information is MAC CE.

The source cell sends measurement control information to the terminal.

The terminal returns a measurement report to the source cell.

the information of the candidate target cell, the UL resource reserved by the source cell, the MCS information, the pilot frequency information, the period of reserving the UL resource and the like.

When the terminal switches the cells, a target cell meeting the switching condition is selected according to the alternative target cell in the conditional switching command information configured by the source cell, and the target cell identifier is sent to the source cell through the MAC CE information, wherein the target cell identifier can be ID information of the target cell;

in the embodiment of the invention, when a terminal sends a target cell identifier to a source cell through MAC CE information, the terminal sends the MAC CE information carrying the target cell identifier at a reserved UL resource position configured by the source cell; the MAC CE information carrying the target cell identification has the highest priority in the multiplexing process;

as shown in table 1, the MAC CE format, where physcellld indicates target cell ID information to which the terminal is to be handed over;

TABLE 1

A source cell receives MAC CE information which is sent by a terminal and carries a target cell identifier, and a target cell switched by the terminal is determined according to the target cell identifier;

and the source cell receives the MAC CE information carrying the target cell identifier at a reserved UL resource position configured for the terminal.

Example two: and the source cell determines whether to perform data forwarding according to the behavior of the terminal, the source cell cannot receive the data sent by the terminal within the set time length, namely the terminal and the source cell stop communicating for the set time length, and the source cell performs data forwarding to all the alternative target cells.

In the embodiment of the present invention, when the terminal satisfies the handover condition and executes the handover process with the target cell, the terminal will disconnect from the source cell, the source cell and the terminal stop communicating, if the timer is overtime (the set time length is reached), the source cell and the terminal are still in the communication interruption state, the source cell sends the data packet of the terminal to all determined candidate target cells, and in the process of sending the data packet of the terminal to all candidate target cells: and determining whether to send a data packet to the corresponding alternative target cell according to the information returned by the alternative target cell.

The first condition is as follows: when receiving indication information sent by an alternative target cell and sent by a target cell which performs cell switching for a terminal in the process of performing data forwarding (namely, in the process of sending a data packet of the terminal to the alternative target cell by a source cell), a source cell stops sending the data packet of the terminal to the alternative target cells except the target cell which sends the indication information, namely, stops performing data forwarding to the alternative target cells except the target cell which sends the indication information.

As shown in fig. 4, a flowchart for a source cell to forward data according to a behavior of a terminal provided in an embodiment of the present invention includes the following steps:

step 400, the source cell sends measurement control information to the terminal.

In step 401, the terminal performs RRM measurement and returns a measurement report to the source cell.

Step 402, after the source cell receives the measurement report returned by the terminal, the target cell that the terminal can perform handover is determined.

Step 403, the source cell sends a handover request message to the target cell where the determined terminal can perform handover;

Step 404, the target cell which can be switched by the terminal performs admission control according to the switching request information sent by the source cell;

Step 405, after determining that the terminal itself accepts the terminal handover, the target cell which the terminal can perform handover sends a handover request response message to the source cell;

for example, the target cell 1 and the target cell 2 accept terminal switching, and the target cell 1 and the target cell 2 send a switching request response message to the source cell, so that the source cell determines an alternative target cell accepting terminal switching according to the switching request response message;

it should be noted that target cell 1 and target cell 2 may not return a message, but target cell 3 returns a negative message; or the target cell 1 and the target cell 2 return response messages, but the target cell 3 does not return messages; or the target cell 1 and the target cell 2 return a response message, the target cell 3 returns a negative message, and so on, so that the source cell determines the candidate target cell allowing the terminal to perform handover, which is determined specifically by how to configure, and is not described herein again.

Step 406, the source cell determines an alternative target cell according to the received handover request response message;

Step 407, the source cell switches the command information to the condition configured to carry the candidate target cell;

in practical application, the configured conditional handover command information includes an alternative target cell identifier (alternative target cell ID), and the condition for executing the target cell handover; the method specifically comprises measurement configuration information, target cell selection information, a candidate target cell 1 and a candidate target cell 2.

Step 408, the terminal receives the conditional handover command information configured by the source cell, selects an alternative target cell meeting the handover condition for handover when determining that the conditional handover is met, and disconnects communication with the source cell;

assume that the terminal selects the candidate target cell for handover as candidate target cell 1.

Step 409, after the source cell does not receive the data sent by the terminal within a set time length, sending a data packet of the terminal to all the alternative target cells;

after the communication between the terminal and the source cell is interrupted, the source cell cannot receive data sent by the terminal, if the data of all the terminals are not received within a set time length, the source cell determines that the terminal executes a switching process, and the source cell does not know the cell to which the terminal is switched, so that the source cell sends data packets of the terminal to all the alternative target cells, and at the moment, the source cell sends the data packets of the terminal to the alternative target cell 1 and the alternative target cell 2.

Step 410, the terminal and the selected candidate target cell 1 execute the access process of switching;

and switching the process between the terminal and the alternative target cell 1.

Step 411, the candidate target cell 1 selected by the terminal determines that the terminal is to be switched to itself, and sends a confirmation message to the source cell;

when a terminal executes a switching process to an alternative target cell 1, the alternative target cell 1 determines that the terminal is to be switched, the alternative target cell 1 determines that the alternative target cell 1 is a target cell for performing cell switching with the terminal, and after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, the alternative target cell 1 returns a confirmation message to the source cell.

Step 412, the source cell stops sending the data packet of the terminal to the alternative target cell except for the target cell 1;

at this point, the source cell stops sending the data packet of the terminal to the candidate target cell 2.

In step 413, the source cell sends information for canceling the terminal handover to an alternative target cell except the target cell 1 where the terminal performs the handover.

And after determining that the terminal is to be switched to the alternative target cell 1, the source cell sends information for canceling the terminal switching to the alternative target cell 2.

Correspondingly, the candidate target cell 2 returns the information for confirming the cancellation of the terminal switching to the terminal, so that the source cell receives the information for confirming the cancellation of the terminal switching returned by the candidate target cell 2.

And step 414, the source cell receives the information for confirming the cancel of the terminal switching returned by the alternative target cells except the target cell 1 for the terminal to execute the switching.

In step 415, the terminal sends handover complete information to the candidate target cell 1.

The terminal sends the information of the completion of the handover to the alternative target cell 1.

Step 416, the candidate target cell 1 sends a secondary base station status request to the source cell.

Step 417, the source cell returns the state information of the secondary base station to the candidate target cell 1.

Case two: when a source cell receives a data packet which is sent by an alternative target cell and is not a target cell for cell switching of a terminal during a data forwarding process (namely, during a process that the source cell sends the data packet of the terminal to the alternative target cell), the source cell stops sending the data packet of the terminal to the alternative target cell, namely stops executing the data forwarding to the alternative target cell.

As shown in fig. 5, a flowchart for performing data forwarding for another source cell according to the behavior of the terminal provided in the embodiment of the present invention includes the following steps:

step 500, the source cell sends measurement control information to the terminal.

In step 501, the terminal performs RRM measurement and returns a measurement report to the source cell.

Step 502, after the source cell receives the measurement report returned by the terminal, the target cell that the terminal can perform handover is determined.

Step 503, the source cell sends a handover request message to the target cell where the determined terminal can perform handover;

Step 504, the target cell that the terminal can switch carries out admission control according to the switching request information sent by the source cell;

Step 505, after determining that the terminal itself accepts the terminal handover, the target cell which the terminal can perform handover sends a handover request response message to the source cell;

Step 506, the source cell determines an alternative target cell according to the received handover request response message;

Step 507, the source cell configures the conditional switch command information carrying the candidate target cell to the terminal;

in practical application, the configured conditional handover command information includes an alternative target cell identifier (alternative target cell ID), and the condition for executing the target cell handover is implemented; the method specifically comprises measurement configuration information, target cell selection information, a candidate target cell 1 and a candidate target cell 2.

Step 508, the terminal receives the condition switching command information configured in the source cell, and when determining that the condition switching is satisfied, selects an alternative target cell satisfying the switching condition to switch, and disconnects the communication with the source cell;

Step 509, after the source cell does not receive the data sent by the terminal within the set time length, sending a data packet of the terminal to all the candidate target cells;

Step 510, the terminal and the selected candidate target cell 1 execute the access process of switching;

Step 511, the candidate target cell 2 not selected by the terminal determines that it is not the target cell for the terminal to perform cell switching, and sends a rejection message to the source cell;

when the terminal executes the switching process to the alternative target cell 1, the alternative target cell 1 determines that the terminal is to be switched, the alternative target cell 2 determines that the terminal is not the target cell switched with the terminal, and after receiving a data packet of the terminal sent by the source cell before the terminal is switched to the target cell, the alternative target cell 2 returns a rejection message to the source cell.

And step 512, after receiving the reject cell returned by the candidate target cell 2, the source cell stops sending the data packet of the terminal to the candidate target cell 2.

Step 513, the source cell sends the information for canceling the terminal switch to the candidate target cell 2.

And step 514, the source cell receives the information for confirming the cancel of the terminal switching returned by the alternative target cell 2.

Step 515, the terminal sends the information of the handover completion to the candidate target cell 1.

In step 516, the candidate target cell 1 sends a secondary base station status request to the source cell.

And 517, the source cell returns the state information of the secondary base station to the alternative target cell 1.

As shown in fig. 6, a structure diagram of a first data forwarding apparatus provided in an embodiment of the present invention includes: a processor 600, a memory 601, and a transceiver 602.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 601 may store data used by the processor 600 in performing operations. The transceiver 602 is used to receive and transmit data under the control of the processor 600.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 600 and various circuits of memory represented by memory 601 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 601 may store data used by the processor 600 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to the processor 600, or implemented by the processor 600. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 600. The processor 600 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof that may implement or perform the methods, steps or logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 601, and the processor 600 reads the information in the memory 601 and completes the steps of the signal processing flow in combination with the hardware thereof.

The processor 600 is configured to read the program in the memory 601 and execute the following processes:

sending a condition switching command to the terminal; and before the terminal is switched to a target cell, sending a data packet of the terminal to the target cell.

Optionally, the processor 600 is further configured to:

receiving indication information which is sent by the terminal and contains a target cell identifier;

and sending the data packet of the terminal to the target cell corresponding to the target cell identifier.

Optionally, the indication information includes:

preamble information or RRC signaling or MAC CE.

Optionally, if the indication information is Preamble information, the processor 600 is specifically configured to:

and receiving the indication information at a time-frequency domain resource position configured for the terminal and used for sending the Preamble information.

Optionally, if the indication information is RRC signaling or MAC CE, the processor 600 is specifically configured to:

receiving the indication information on a reserved UL resource location configured for the terminal.

Optionally, the processor 600 is further configured to:

and if the data sent by the terminal is not received within the set time length, sending a data packet of the terminal to all the alternative target cells, wherein the alternative target cells comprise the target cell.

Optionally, the processor 600 is further configured to:

in the process of sending the data packet, if a rejection message returned by the alternative target cell is received, stopping sending the data packet of the terminal to the alternative target cell returning the rejection message; or

And in the process of sending the data packet, if receiving the confirmation information returned by the alternative target cell, stopping sending the data packet of the terminal to the alternative target cells except the alternative target cell returning the confirmation information.

As shown in fig. 7, a structure diagram of a second data forwarding apparatus provided in the embodiment of the present invention includes: a processor 700, a memory 701, and a transceiver 702.

The processor 700 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 700 in performing operations. The transceiver 702 is used to receive and transmit data under the control of the processor 700.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 700, and various circuits, represented by memory 701, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 700 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to the processor 700, or implemented by the processor 700. In implementation, the steps of the signal processing flow may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 700. The processor 700 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof that may implement or perform the methods, steps or logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 701, and the processor 700 reads the information in the memory 701, and completes the steps of the signal processing flow in combination with the hardware thereof.

The processor 700 is configured to read the program in the memory 701 and execute the following processes:

determining a target cell according to a conditional switching command sent by a source cell;

and sending the target cell information to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

Optionally, the processor 700 is specifically configured to:

and sending the indication information containing the target cell identification to the source cell.

Optionally, the indication information includes:

preamble information or RRC signaling or MAC CE.

Optionally, if the indication information is Preamble information, the processor 700 is specifically configured to:

and sending the indication information on a time-frequency domain resource position configured by the source cell and used for sending the Preamble information.

Optionally, if the indication information is RRC signaling or MAC CE, the processor 700 is specifically configured to:

and sending the indication information on a reserved UL resource position configured by the source cell.

As shown in fig. 8, a third apparatus structure for data forwarding provided in the embodiment of the present invention includes: a processor 800, a memory 801, and a transceiver 802.

The processor 800 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 800 in performing operations. The transceiver 802 is used to receive and transmit data under the control of the processor 800.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 800 and various circuits of memory represented by memory 801 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 800 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to processor 800, or implemented by processor 800. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 800. The processor 800 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 801, and the processor 800 reads the information in the memory 801 and completes the steps of the signal processing flow in combination with the hardware thereof.

The processor 800 is configured to read the program in the memory 801 and execute the following processes:

if the terminal is confirmed to be the target cell for cell switching by the terminal, after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to the alternative target cell except the target cell.

Optionally, the processor 800 is further configured to:

and if the terminal is not the target cell for cell switching by the terminal, returning a rejection message to the source cell after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell so as to enable the source cell to stop sending the data packet of the terminal to the alternative target cell.

As shown in fig. 9, a fourth data forwarding apparatus provided in the embodiment of the present invention includes: a first sending module 900 and a second sending module 901;

the first sending module 900 is configured to: sending a condition switching command to the terminal;

the second sending module 901 is configured to: and before the terminal is switched to a target cell, sending a data packet of the terminal to the target cell.

Optionally, the second sending module 901 is further configured to:

Optionally, the indication information includes:

preamble information or RRC signaling or MAC CE.

Optionally, if the indication information is Preamble information, the second sending module 901 is further configured to:

Optionally, if the indication information is RRC signaling or MAC CE, the second sending module 901 is further configured to:

the source cell receives the indication information on a reserved UL resource location configured for the terminal.

Optionally, the second sending module 901 is further configured to:

in the process of sending the data packet, if receiving confirmation information returned by the alternative target cell, stopping sending the data packet of the terminal to the alternative target cells except the alternative target cell returning the confirmation information; or

As shown in fig. 10, a fifth apparatus structure for data forwarding provided in the embodiment of the present invention includes: a first determining module 1000, a third sending module 1001;

the first determining module 1000 is configured to: determining a target cell according to a conditional switching command sent by a source cell;

the third sending module 1001 is configured to: and sending the target cell information to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

Optionally, the third sending module 1001 is specifically configured to:

Optionally, the indication information includes:

preamble information or RRC signaling or MAC CE.

Optionally, if the indication information is Preamble information, the third sending module 1001 is specifically configured to:

Optionally, if the indication information is an RRC signaling or a MAC CE, the third sending module 1001 is specifically configured to:

In an embodiment of the present invention, a sixth apparatus for data forwarding is further provided, where the apparatus includes: a confirmation module;

the confirmation module is to: if the terminal is confirmed to be a target cell for cell switching by the terminal, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to alternative target cells except the target cell; or

The confirmation module is to: and if the terminal is not the target cell for cell switching by the terminal, returning a rejection message to the source cell after receiving the data packet of the terminal sent by the source cell before the terminal is switched to the target cell so as to enable the source cell to stop sending the data packet of the terminal to the alternative target cell.

An embodiment of the present invention provides a readable storage medium, which is a non-volatile storage medium, and the readable storage medium is a non-volatile readable storage medium, and includes program code, when the program code runs on a computing device, the program code is configured to cause the computing device to perform any step of the foregoing data forwarding.

An embodiment of the present invention provides a computer program product including instructions, which, when running on a computer, enables the computing device to execute a scheme for performing data forwarding on the terminal, and enables the computing device to execute any step of the data forwarding.

Based on the same inventive concept, the embodiment of the present invention further provides a method for data forwarding, and since the device corresponding to the method is the device in the data forwarding system in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the device, the implementation of the method can refer to the implementation of the system, and repeated details are not repeated.

As shown in fig. 11, a flowchart of a first method for forwarding data provided in the embodiment of the present invention includes the following steps:

step 1100, the source cell sends a conditional switch command to the terminal;

step 1101, before the terminal is switched to a target cell, the source cell sends a data packet of the terminal to the target cell.

Optionally, before the source cell sends the data packet of the terminal to the target cell, the method further includes:

the source cell receives indication information which is sent by the terminal and contains a target cell identifier;

the sending, by the source cell, the data packet of the terminal to the target cell includes:

and the source cell sends the data packet of the terminal to the target cell corresponding to the target cell identification.

Optionally, the indication information includes:

preamble information or RRC signaling or MAC CE.

Optionally, if the indication information is Preamble information, the receiving, by the source cell, the indication information including the target cell identifier sent by the terminal includes:

the source cell receives the indication information at a time-frequency domain resource position configured for the terminal and used for sending the Preamble information; or

If the indication information is RRC signaling or MAC CE, the receiving, by the source cell, the indication information including the target cell identifier sent by the terminal includes:

Optionally, after the source cell determines that the terminal needs to perform cell handover, before sending the data packet of the terminal to the target cell, the method further includes:

and if the source cell does not receive the data sent by the terminal within a set time length, sending a data packet of the terminal to all alternative target cells, wherein the alternative target cells comprise the target cell.

Optionally, the sending, by the source cell, the data packet of the terminal to the candidate target cell further includes:

in the process of sending the data packet, if a rejection message returned by the alternative target cell is received, the source cell stops sending the data packet of the terminal to the alternative target cell returning the rejection message; or

Based on the same inventive concept, another data forwarding method is also provided in the embodiments of the present invention, and since the device corresponding to the method is the device in the data forwarding system in the embodiments of the present invention, and the principle of the method for solving the problem is similar to that of the device, the implementation of the method can refer to the implementation of the system, and repeated details are not repeated.

As shown in fig. 12, another flow chart of a method for forwarding data provided in the embodiment of the present invention includes the following steps:

step 1200, the terminal determines a target cell according to a conditional switch command sent by a source cell;

step 1201, the terminal sends the target cell information to the source cell, so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

Optionally, the sending, by the terminal, the target cell information to the source cell includes:

and the terminal sends the indication information containing the target cell identification to the source cell.

Optionally, the indication information includes:

preamble information or RRC signaling or MAC CE.

Optionally, if the indication information is Preamble information, the terminal sends the indication information including the target cell identifier to the source cell, including:

and the terminal sends the indication information on a time-frequency domain resource position configured by the source cell and used for sending the Preamble information.

Optionally, if the indication information is RRC signaling or MAC CE, the terminal sends the indication information including the target cell identifier to the source cell, including:

and the terminal sends the indication information on a reserved UL resource position configured by the source cell.

Optionally, the method includes: if the alternative target cell confirms that the alternative target cell is the target cell for the terminal to perform cell switching, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so that the source cell stops sending the data packet of the terminal to the alternative target cell except the target cell.

Optionally, the method further includes: and if the alternative target cell determines that the alternative target cell is not the target cell for cell switching of the terminal, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a rejection message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to the alternative target cell.

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of data forwarding, the method comprising:

the source cell sends a conditional switching command to the terminal;

2. The method of claim 1, wherein before the source cell sends the data packet of the terminal to the target cell, the method further comprises:

3. The method of claim 2, wherein the indication information comprises:

preamble information or radio resource control RRC signaling or medium access layer control element MAC CE.

4. The method of claim 3, wherein if the indication information is Preamble information, the receiving, by the source cell, the indication information including the target cell identifier sent by the terminal includes:

the source cell receives the indication information at a reserved uplink, UL, resource location configured for the terminal.

5. The method of claim 1, wherein after the source cell determines that the terminal needs to perform cell handover, before sending the data packet of the terminal to the target cell, the method further comprises:

6. The method of claim 5, wherein the source cell sends the data packet of the terminal to the candidate target cell, further comprising:

7. A method of data forwarding, the method comprising:

and the terminal sends the target cell information to the source cell so that the source cell sends a data packet of the terminal to the target cell before the terminal is switched to the target cell.

8. The method of claim 7, wherein the terminal sending the target cell information to the source cell comprises:

9. The method of claim 8, wherein the indication information comprises:

preamble information or RRC signaling or MAC CE.

10. The method of claim 9, wherein if the indication information is Preamble information, the terminal sends the indication information including the target cell identifier to the source cell, including:

the terminal sends the indication information on a time-frequency domain resource position configured by the source cell and used for sending the Preamble information; or

If the indication information is RRC signaling or MAC CE, the terminal sends the indication information including the target cell identifier to the source cell, including:

11. A method of data forwarding, the method comprising:

if the alternative target cell confirms that the alternative target cell is the target cell for the terminal to perform cell switching, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a confirmation message to the source cell so that the source cell stops sending the data packet of the terminal to the alternative target cell except the target cell.

12. The method of claim 11, further comprising:

and if the alternative target cell determines that the alternative target cell is not the target cell for cell switching of the terminal, after receiving a data packet of the terminal sent by a source cell before the terminal is switched to the target cell, returning a rejection message to the source cell so as to enable the source cell to stop sending the data packet of the terminal to the alternative target cell.

13. An apparatus for data forwarding, the apparatus comprising: a processor, a memory, and a transceiver;

14. The device of claim 13, wherein the processor is further configured to:

15. The apparatus of claim 14, wherein the indication information comprises:

preamble information or RRC signaling or MAC CE.

16. The device of claim 15, wherein if the indication information is Preamble information, the processor is specifically configured to:

receiving the indication information at a time-frequency domain resource position configured for the terminal and used for sending the Preamble information; or

If the indication information is RRC signaling or MAC CE, the processor is specifically configured to:

17. The device of claim 13, wherein the processor is further configured to:

18. The device of claim 17, wherein the processor is further configured to:

19. An apparatus for data forwarding, the apparatus comprising: a processor, a memory, and a transceiver;

and sending the target cell information to the source cell so that the source cell sends a data packet of the terminal to the target cell before the terminal is switched to the target cell.

20. The device of claim 19, wherein the processor is specifically configured to:

21. The apparatus of claim 20, wherein the indication information comprises:

preamble information or RRC signaling or MAC CE.

22. The device of claim 21, wherein if the indication information is Preamble information, the processor is specifically configured to:

sending the indication information on a time-frequency domain resource position configured by the source cell and used for sending the Preamble information; or

23. An apparatus for data forwarding, the apparatus comprising: a processor, a memory, and a transceiver;

24. The device of claim 23, wherein the processor is further configured to:

25. An apparatus for data forwarding, the apparatus comprising: the device comprises a first determining module and a first sending module;

the first sending module is configured to: sending a condition switching command to the terminal;

the second sending module is configured to: and before the terminal is switched to a target cell, sending a data packet of the terminal to the target cell.

26. An apparatus for data forwarding, the apparatus comprising: a second determining module and a second sending module;

the first determination module is to: determining a target cell according to a conditional switching command sent by a source cell;

the third sending module is configured to: and sending the target cell information to the source cell so that the source cell sends the data packet of the terminal to the target cell before the terminal is switched to the target cell.

27. An apparatus for data forwarding, the apparatus comprising: a confirmation module;

28. A computer storage medium having a computer program stored thereon, the program, when executed by a processor, implementing the steps of a method according to any one of claims 1 to 6 or the steps of a method according to any one of claims 7 to 10 or the steps of a method according to any one of claims 11 to 12.