CN115623451A - Conditional switching method and device - Google Patents

Abstract

The embodiment of the application discloses a condition switching method and equipment, and belongs to the technical field of communication. The condition switching method of the embodiment of the application comprises the following steps: the first terminal receives the reconfiguration signaling of the condition switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes; and the first terminal executes a condition switching process according to the reconfiguration signaling.

Description

Conditional switching method and device

technical field

The present application belongs to the technical field of communications, and in particular relates to a conditional switching method and device.

Background technique

In a typical secondary link (sidelink) relay scenario, the remote terminal (remote UE) passes through the sidelink link (or relay link) between the relay terminal (relay UE), and the relay terminal Its data is forwarded to the network side device. In this sidelink relay scenario, data transmission is performed between the remote terminal and the network-side device, and the relay terminal plays the role of data transfer. Among them, the user network universal interface (User to network universal interface, Uu) interface, between the relay terminal and the remote terminal is a sidelink (sidelink) interface, or PC5 interface.

In the related art, only ordinary terminals (Uu terminals) are supported to perform conditional handover process in which the candidate node is a network node, and the conditional handover process related to the secondary link relay scenario is not supported, and the handover success rate of the terminal is low.

Contents of the invention

Embodiments of the present application provide a conditional handover method and device, which can solve the problem of low terminal handover success rate in the related art because the conditional handover process related to the secondary link relay scenario is not supported.

In a first aspect, a method for conditional handover is provided, including: a first terminal receives reconfiguration signaling for conditional handover; wherein, the reconfiguration signaling includes information about candidate nodes, and the candidate nodes include network nodes and/or or a relay node; the first terminal executes a conditional handover process according to the reconfiguration signaling.

In a second aspect, a method for conditional handover is provided, including: a network side device sends reconfiguration signaling for conditional handover, and the reconfiguration signaling is used for the first terminal to perform a conditional handover process; wherein, the reconfiguration signaling It includes relevant information of candidate nodes, where the candidate nodes include network nodes and/or relay nodes.

In a third aspect, a conditional handover device is provided, including: a receiving module, configured to receive reconfiguration signaling of conditional handover; wherein, the reconfiguration signaling includes information about candidate nodes, and the candidate nodes include network nodes And/or a relay node; a conditional handover module, configured to perform a conditional handover process according to the reconfiguration signaling.

In a fourth aspect, a conditional handover device is provided, including: a sending module, configured to send reconfiguration signaling for conditional handover, and the reconfiguration signaling is used for the first terminal to perform a conditional handover process; wherein, the reconfiguration The signaling includes information about candidate nodes, where the candidate nodes include network nodes and/or relay nodes.

According to a fifth aspect, a terminal is provided. The terminal includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor. When the program or instruction is executed by the processor Implement the method as described in the first aspect.

In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is used to perform a conditional handover process according to reconfiguration signaling, and the communication interface is used to receive reconfiguration signaling of conditional handover; wherein , the reconfiguration signaling includes information about candidate nodes, where the candidate nodes include network nodes and/or relay nodes.

According to the seventh aspect, a network-side device is provided, the network-side device includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor, and the program or instruction is executed by the The processor realizes the method described in the second aspect when executing.

In an eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send reconfiguration signaling for conditional handover, and the reconfiguration signaling is used for the first terminal to perform conditional handover process; wherein, the reconfiguration signaling includes information about candidate nodes, and the candidate nodes include network nodes and/or relay nodes.

A ninth aspect provides a readable storage medium, on which a program or an instruction is stored, and when the program or instruction is executed by a processor, the method as described in the first aspect is implemented, or the method as described in the second aspect is implemented. method described in the aspect.

In a tenth aspect, a chip is provided, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect , or implement the method described in the second aspect.

In an eleventh aspect, a computer program/program product is provided, the computer program/program product is stored in a non-transitory storage medium, and the program/program product is executed by at least one processor to implement the first The method described in the first aspect, or implement the method described in the second aspect.

In this embodiment of the present application, the reconfiguration signaling received by the first terminal includes information about candidate nodes, and the candidate nodes include network nodes and/or relay nodes, so that the first terminal can switch to the network node or relay node, It can solve the conditional handover process related to the secondary link relay scenario in the related art, and improve the handover success rate of the terminal.

Description of drawings

FIG. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;

FIG. 2 is a schematic flowchart of a conditional switching method according to an embodiment of the present application;

FIG. 3 is a schematic flowchart of a conditional switching method according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a conditional switching device according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a conditional switching device according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application;

Fig. 8 is a schematic structural diagram of a network side device according to an embodiment of the present application.

detailed description

The following will clearly describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein and that "first" and "second" distinguish objects. It is usually one category, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the description and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

It is worth pointing out that the technology described in the embodiment of this application is not limited to the Long Term Evolution (Long Term Evolution, LTE)/LTE-Advanced (LTE-Advanced, LTE-A) system, and can also be used in other wireless communication systems, such as code division Multiple Access (Code Division Multiple Access, CDMA), Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (OFDMA) , Single-carrier Frequency-Division Multiple Access (Single-carrier Frequency-Division Multiple Access, SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned system and radio technology, and can also be used for other systems and radio technologies. The following description describes the New Radio (New Radio, NR) system for exemplary purposes, and uses NR terminology in most of the following descriptions, and these technologies can also be applied to applications other than NR system applications, such as the 6th Generation (6 ^th Generation , 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which this embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network side device 12 . Wherein, the terminal 11 may also be called a terminal device or a user terminal (UserEquipment, UE), and the terminal 11 may be a mobile phone, a tablet computer (Tablet Computer), a laptop computer (LaptopComputer) or a notebook computer, a personal digital assistant (Personal Digital Assistant). Digital Assistant (PDA), Pocket PC, Netbook, Ultra-mobile personal computer (UMPC), Mobile Internet Device (Mobile Internet Device, MID), Wearable Device (Wearable Device) or Vehicle Equipment (VUE) , Pedestrian Terminal (PUE) and other terminal-side devices, wearable devices include: smart watches, bracelets, earphones, glasses, etc. It should be noted that, the embodiment of the present application does not limit the specific type of the terminal 11 . The network side device 12 may be a base station or a core network, where a base station may be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service Basic Service Set (BSS), Extended Service Set (ESS), Node B, Evolved Node B (eNB), Next Generation Node B (gNB), Home Node B, Home Evolved Node B, WLAN Access point, WiFi node, Transmitting Receiving Point (Transmitting Receiving Point, TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that, In the embodiment of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The conditional switching method and device provided by the embodiments of the present application will be described in detail below through some embodiments and application scenarios with reference to the accompanying drawings.

As shown in FIG. 2 , the embodiment of the present application provides a conditional switching method 200, which can be executed by a terminal, in other words, the method can be executed by software or hardware installed in the terminal, and the method includes the following steps.

S202: The first terminal receives conditional handover (Conditional HandOver, CHO) reconfiguration signaling; wherein, the reconfiguration signaling includes information about candidate nodes, and the candidate nodes include network nodes and/or relay nodes.

In this embodiment, the first terminal may be a remote terminal under the secondary link relay architecture, that is, before the conditional handover, the first terminal is connected to the relay terminal through a relay link. The first terminal may also be a user network universal interface (Userto network universal interface, Uu) link terminal, that is, before the conditional handover, the first terminal is directly connected to the network side device (such as a base station) through a Uu link,

In the case that the first terminal is a remote terminal, the candidate nodes configured by the network side device for the first terminal may include a network node and/or a relay node. In the case that the first terminal is a Uu link terminal, the candidate nodes configured by the network side device for the first terminal may include one of the following: a network node and a relay node; and a relay node.

Optionally, before S202, the first terminal may also receive measurement configuration signaling for conditional handover. The measurement configuration signaling may configure a measurement object for the first terminal, and the measurement object may include at least one of the following: a network node, a first Relay nodes near the terminal.

The first terminal can measure the measurement object after receiving the measurement configuration signaling, and can report the measurement result when the reporting condition is met. According to the measurement results, if the network side device finds that the configuration requirements for conditional handover are met, for example, the link quality of the current Uu link of the first terminal is not good, and there are alternative available relay nodes around the first terminal that can provide potential For the transmission of the relay link, the above-mentioned relay node may be considered as a candidate node of the first terminal, and configured to the first terminal through reconfiguration signaling of conditional handover. For another example, the link quality of the current relay link of the first terminal is not good, and there are alternative available network nodes and/or relay nodes around the first terminal that can provide potential Uu link transmission for it, then it may Consider using the above-mentioned network nodes and/or relay nodes as candidate nodes for the first terminal, and configure them to the first terminal through conditional handover reconfiguration signaling

S204: The first terminal performs a conditional handover process according to the reconfiguration signaling.

In this step, for example, when the first terminal determines that the target relay node among the candidate nodes satisfies the conditions for executing conditional handover, it can disconnect the connection with the source network node or the source relay node, and access the target relay node The provided relay link.

This step is another example, when the first terminal judges that the target network node among the candidate nodes satisfies the conditions for executing conditional handover, it can disconnect the connection with the source relay node and access the Uu link provided by the target network node .

In the conditional handover method provided in the embodiment of the present application, the reconfiguration signaling received by the first terminal includes a candidate node, and the candidate node includes a network node and/or a relay node, so that the first terminal can be handed over to the network node or the relay node, It can solve the conditional handover process related to the secondary link relay scenario in the related art, and improve the handover success rate of the terminal.

The handover success rate mentioned above, for example, when the first terminal is a remote terminal, because the candidate nodes include network nodes and/or relay nodes, the first terminal can be handed over to a network node, and can also be handed over to a relay node, improve the handover success rate, lower the probability of handover failure, and improve the service experience of the first terminal during the handover process; at the same time, it can enable the remote terminal to fully enjoy various benefits of conditional handover, improve the handover success rate, and ensure This improves the service experience and system efficiency of remote terminals.

For another example, when the first terminal is a Uu link terminal, since the candidate nodes include network nodes and/or relay nodes, the first terminal can be handed over to the network node, and can also be handed over to the relay node to improve the handover success rate , the probability of handover failure is low, and the service experience of the first terminal during the handover process is improved.

Optionally, the reconfiguration information received by the first terminal may include at least one of the following 1) to 6):

1) The information of the network node, for example, the identification of the network node among the candidate nodes, the identification of the Uu link provided by the network node, and the like.

2) Configuration information of network nodes, for example, link bearer configuration information and the like.

3) The first condition corresponding to the network node switches the execution condition.

4) Information of the relay node. For example, the identifier of the relay node (relay UE ID), the PC5 layer-2 identifier of the relay node (PC5 layer-2ID of the relay UE), the Uu link identifier of the relay node connection (Uu ID of the relay UE), such as the cell Cell-Radio Network Temporary Identity (C-RNTI), etc.

5) Configuration information of the relay node. For example, a PC5 radio link control (Radio Link Control, RLC) bearer (bearer) configuration and the like.

6) The second condition corresponding to the relay node switches the execution condition.

Optionally, the above-mentioned second conditional switching execution condition includes at least one of the following:

1) The link quality of the Uu link is lower than the first threshold. The Uu link may include the Uu link with the best (Uu) link quality that can be searched by the first terminal, and may also include the Uu link of the source network node before the conditional handover of the first terminal.

The link quality mentioned in this embodiment is lower than the first threshold, for example, the Reference Signal Received Power (ReferenceSignal Receiving Power, RSRP) is lower than the threshold 11, and for example, the Reference Signal Received Quality (ReferenceSignal Receiving Quality, RSRQ) or signal An interference-to-noise ratio (Signal to Interference plus NoiseRatio, SINR) is higher than the threshold 12; wherein, the threshold 11 and the threshold 12 are both related to the first threshold.

2) The link quality of the relay link is higher than the second threshold. The relay link may include a relay link provided by a relay node among the candidate nodes.

The link quality mentioned in this embodiment is higher than the second threshold, for example, RSRP is higher than threshold 21, and for example, RSRQ or SINR is lower than threshold 22; wherein, threshold 21 and threshold 22 are both related to the second threshold.

Generally, since the relay link is different from the Uu link, the first conditional handover execution condition and the second conditional handover execution condition are usually configured independently. Of course, in very special cases, multiplexing is not excluded, for example, the second conditional switching execution condition is multiplexed with the first conditional switching execution condition. Specifically, for example, both the second conditional handover execution condition and the first conditional handover execution condition are that the link quality of the cell provided by the source network node is poor enough, that is, the conditional handover is performed. At this time, the first terminal may not evaluate the candidate node to improve Handover efficiency, improve handover success rate.

In an example, the first terminal executing the conditional handover process according to the reconfiguration signaling includes: when the target relay node among the candidate nodes satisfies the second conditional handover execution condition, the second A terminal disconnects from the source network node or the source relay node, and accesses the relay link provided by the target relay node.

The aforementioned access to the relay link provided by the target relay node includes at least one of the following:

1) Perform a discovery process with the target relay node.

2) Establishing a PC5 connection with the target relay node.

3) Send a reconfiguration complete message through the PC5 link.

In another example, the first terminal executing the conditional handover process according to the reconfiguration signaling includes: when the target network node among the candidate nodes satisfies the first conditional handover execution condition, the second A terminal disconnects from the source relay node, and accesses the Uu link provided by the target network node.

After the first terminal disconnects from the source relay node and accesses the Uu link provided by the target network node, the method further includes at least one of the following:

1) Release the RLC bearer of the PC5 interface with the source relay node.

2) Release the PC5 connection with the source relay node.

Optionally, after the first terminal disconnects from the source relay node and accesses the Uu link provided by the target network node, the first terminal may also send reconfiguration completion information.

Optionally, for an end-to-end radio link control reliable mode radio bearer (E2E RLC AM RB), the first terminal may also disconnect from the source relay node and access the Uu link provided by the target network node After the path, the first terminal can also trigger a status report (status report) at the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer, and then perform a check on the data loss caused by switching paths according to the retransmission operation of the status report. recovery, so as to achieve the purpose of lossless switching.

Optionally, the reconfiguration signaling mentioned in the foregoing embodiments may include conditional handover execution conditions, and the execution of the conditional handover process according to the reconfiguration signaling includes: when M network nodes and N relay nodes are simultaneously When the respective conditional handover execution conditions are met, a target network node is selected from the M network nodes, or a target relay node is selected from the N relay nodes according to preset rules; wherein, M and N are positive integers.

The foregoing preset rules may include one of the following.

1) Selecting a target network node from the M network nodes preferentially.

2) Selecting a target relay node from the N relay nodes preferentially.

3) In the case that the first terminal's requirement on service performance satisfies the first condition, preferentially selecting a target network node from the M network nodes.

4) In the case that the first terminal's requirement on power saving performance satisfies the second condition, preferentially select a target relay node from the N relay nodes.

5) According to the configuration, it is determined to preferentially select a target network node from the M network nodes or preferentially select a target relay node from the N relay nodes.

The above preset rules may also include at least one of the following: Uu link quality condition, PC5 link quality condition, Uu link load condition, PC5 link load condition, and power condition of the N relay nodes. This embodiment further introduces other dimensions or conditions to assist the selection of the first terminal and reduce the implementation difficulty of the first terminal.

In an example, the selecting a target relay node from the N relay nodes includes: selecting a target relay node from the N relay nodes according to at least one of the following: the first terminal and The distance of the N relay nodes, the channel conditions of the N relay nodes, the relay capabilities of the N relay nodes, and whether there is a binding and belonging relationship between the first terminal and the N relay nodes.

Optionally, before the first terminal receives the reconfiguration signaling of conditional handover in the above embodiments, the method further includes: the first terminal sends capability information of conditional handover, and the capability information is used to indicate the following At least one of: the first terminal supports Uu link conditional switching; the first terminal supports relay link conditional switching.

After the step of the first terminal sending the capability information of the conditional handover and before the step of the first terminal receiving the reconfiguration signaling of the conditional handover, the method further includes: the first terminal receiving the conditional handover Measurement configuration signaling; wherein, the measurement configuration signaling includes a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following.

1) When the quality of the Uu link is lower than the third threshold, the first terminal starts to measure the relay nodes among the candidate nodes.

2) The first terminal reports the measurement results of the relay nodes in the candidate nodes periodically or triggered by events.

3) The first terminal measures the relay nodes among the candidate nodes based on the discovery signal and/or the data signal.

The conditional switching method according to the embodiment of the present application has been described in detail above with reference to FIG. 2 . A conditional switching method according to another embodiment of the present application will be described in detail below with reference to FIG. 3 . It can be understood that the interaction between the network-side device and the terminal described from the network-side device is the same as the description on the terminal side in the method shown in FIG. 2 , and related descriptions are appropriately omitted to avoid repetition.

Fig. 3 is a schematic diagram of the implementation flow of the conditional handover method according to the embodiment of the present application, which can be applied to the network side device. As shown in FIG. 3 , the method 300 includes the following steps.

S302: The network side device sends reconfiguration signaling for conditional handover, and the reconfiguration signaling is used for the first terminal to perform a conditional handover process; wherein, the reconfiguration signaling includes information about candidate nodes, and the candidate nodes include Network nodes and/or relay nodes.

In the conditional handover method provided by the embodiment of the present application, the network side device sends reconfiguration signaling for conditional handover, and the reconfiguration signaling includes candidate nodes, and the candidate nodes include network nodes and/or relay nodes, so that the first terminal can switch to The network node or relay node can solve the conditional handover process related to the secondary link relay scenario that is not supported in related technologies, and improve the handover success rate of the terminal.

Optionally, as an embodiment, when the first terminal is a remote terminal, the candidate nodes include the network node and/or the relay node; when the first terminal is a Uu chain In the case of a road terminal, the candidate node includes one of the following: the network node and the relay node; and the relay node.

Optionally, as an embodiment, the reconfiguration signaling includes at least one of the following: information of the network node; configuration information of the network node; a first conditional handover execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second conditional handover execution condition corresponding to the relay node.

Optionally, as an embodiment, the second conditional handover execution condition includes at least one of the following: the link quality of the Uu link is lower than the first threshold; the link quality of the relay link is higher than the second threshold.

Optionally, as an embodiment, the first conditional switching execution condition and the second conditional switching execution condition are independently configured; or the second conditional switching execution condition multiplexes the first conditional switching execution condition .

Optionally, as an embodiment, the reconfiguration signaling includes a conditional handover execution condition, and the reconfiguration signaling is used for the first terminal to perform the following process: when M network nodes and N relay nodes simultaneously When the respective conditional handover execution conditions are met, a target network node is selected from the M network nodes, or a target relay node is selected from the N relay nodes according to preset rules; wherein, M and N are positive integers.

Optionally, as an embodiment, the foregoing preset rule may include one of the following.

1) Selecting a target network node from the M network nodes preferentially.

2) Selecting a target relay node from the N relay nodes preferentially.

3) In the case that the first terminal's requirement on service performance satisfies the first condition, preferentially selecting a target network node from the M network nodes.

4) In the case that the first terminal's requirement on power saving performance satisfies the second condition, preferentially select a target relay node from the N relay nodes.

5) According to the configuration, it is determined to preferentially select a target network node from the M network nodes or preferentially select a target relay node from the N relay nodes.

Optionally, as an embodiment, the preset rule further includes at least one of the following: Uu link quality condition, PC5 link quality condition, Uu link load condition, PC5 link load condition, among the N The power condition of the relay node.

Optionally, as an embodiment, the selecting a target relay node from the N relay nodes includes: selecting a target relay node from the N relay nodes according to at least one of the following: Distance, channel condition, relay capability, binding and belonging relationship between terminals.

Optionally, as an embodiment, before the network side device sends the reconfiguration signaling of conditional handover, the method further includes: the network side device receives capability information of conditional handover, and the capability information is used to indicate the following At least one of: the first terminal supports Uu link conditional switching; the first terminal supports relay link conditional switching.

Optionally, as an embodiment, before the network side device sends the reconfiguration signaling of the conditional handover, the method further includes: the network side device sends the measurement configuration signaling of the conditional handover; wherein, the measurement configuration The signaling includes a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following.

1) When the quality of the Uu link is lower than the third threshold, the first terminal starts to measure the relay nodes among the candidate nodes.

2) The first terminal reports the measurement results of the relay nodes in the candidate nodes periodically or triggered by events.

3) The first terminal measures the relay nodes among the candidate nodes based on the discovery signal and/or the data signal.

Optionally, as an embodiment, the method further includes: the network side device sending a handover request message to the target network side device, the handover request message is used to determine the target link of the first terminal after handover configuration information in .

Optionally, as an embodiment, the handover request message further includes at least one of the following: configuration information of the first terminal in the link before the handover; target network nodes and/or target network nodes that meet conditional handover execution conditions Information about relay nodes.

Optionally, as an embodiment, the method further includes: the network-side device and the target network-side device performing at least one of the following: serial number state transfer; data forwarding.

In order to describe the conditional switching method provided by the embodiment of the present application in detail, the following will describe in conjunction with several specific embodiments.

Embodiment one

This embodiment mainly introduces the situation that the Uu link terminal switches to the relay link provided by the relay terminal (or relay node) through conditional switching.

This embodiment involves a conditional handover process of a remote terminal (remote UE) identity, that is, a UE is currently in a direct link (direct link) with a network side device, and adopts direct Uu communication with its own serving cell (serving cell) process, the terminal is a traditional Uu UE, and when it satisfies certain measurement reporting conditions, the network can configure conditional handover configurations for it, including the configuration that the relay terminal (relay UE) is used as a candidate node (candidate node). This embodiment may include the following steps:

Step 0: UE1 reports its own conditional handover capability information to its serving cell, especially the relaylink conditional handover capability, for example including at least one of the following:

1) UE1 supports ordinary Uu conditional handover: a possible setting is that when the UE supports the capability of being a remote UE and supports ordinary Uu conditional handover, it is considered that the UE supports relay link conditional handover.

2) UE1 supports relay link conditional switching: the other is to set an independent capability indication field for relay link conditional switching.

3) UE1 supports both of the above: the above various methods can indicate that the UE1 can support common Uu conditional handover and relay link conditional handover.

In this example, all the UEs in the example can be remoteUEs and relay UEs capable of supporting the relay link conditional handover. If one of them does not support the relay link conditional handover, it may not be able to perform the relay link conditional handover.

Step 1: The serving cell of UE1 configures measurements for it, and the measurement object can include measurements for surrounding relayUEs, as follows:

1) There may be a certain threshold for the measurement of the relay UE. For example, only when the Uu RSRP of the UE is lower than a threshold 1, UE1 starts to measure the surrounding relay UE.

2) The measurement of the relay UE may not require a threshold, that is, the UE may perform measurement of surrounding relay UEs at any time.

3) The measurement report to the relay UE can be periodic or event-triggered, for example, the measurement result is reported only when the PC5/discovery RSRP between UE1 and the relay UE is higher than a certain threshold.

4) The measurement of the relay UE may be based only on the discovery (discovery) signal, or based on the data (data) signal, or choose one of the two, or measure both.

Step 2: UE1 performs measurement according to the measurement configuration of the network, and reports the measurement result to the network when the conditions for reporting the measurement are met.

Step 3: The serving base station receives the measurement report result of UE1. If it finds that the configuration requirements for conditional handover are met, for example, the current Uu link of UE1 is not good, the Uu RSRP is lower than a certain threshold, and there is an alternative available relay UE2 around UE1. To provide potential relay link transmission, the relay UE2 can be considered as its candidate node (candidated node).

If the candidate relay UE2 is under the control of the same serving gNB (meaning that the serving gNB of UE1 and the serving gNB of UE2 are the same), in the most direct case, the candidate relay UE2 is a connected state UE under the same serving gNB, then at this time The serving gNB may directly send reconfiguration signaling to the relay UE2 through a dedicated RRC procedure (dedicated RRC procedure), and the signaling content may include at least one of the following:

1) Identification information of UE1, such as PC5 Layer-2 ID, and/or Uu ID of UE1, etc.

2) To establish the relay link of UE1, it is necessary to add bearer information, Uu RLCbearer information, and UE1’s end-to-end E2E (End-to-End) wireless bearer RB (Radio bearer) and Uu RLCbearer information in the Uu air interface of the relay UE. mapping relationship between them.

3) To establish the relay link of UE1, it is necessary to add bearer information, PC5RLC bearer information, and optionally, UE1 end-to-end E2E (End-to-End) radio bearer RB (Radio bearer) in the PC5 interface of the relay UE The mapping relationship with PC5 RLC bearer, if there is no mapping information, the default is one-to-one sequential mapping.

After the relay UE2 returns the reconfiguration completion signaling, the network side knows that the relay UE2 has been configured with a relay link serving the remote UE1.

Step 4: The serving base station sends a conditional handover reconfiguration signaling to the remote UE1, which includes at least one of the following:

1) It can contain traditional candidate cell information, related configurations and corresponding conditional switching execution criteria.

2) Contains candidate relay information, mainly the relay UE ID, such as the PC5 layer-2ID of the relay UE, and or the Uu ID (S-TMSI, C-RNTI, I-RNTI) of the relay UE, etc.;

3) It can also include configuration information related to the above candidate relay, such as PC5 RLC bearer configuration, optional mapping relationship between remote UE1 E2E RB and PC5 RLC bearer, etc. If there is no mapping relationship, the default one-to-one sequential mapping.

4) It may also include the execution criteria of conditional switching related to the above candidate relay, for example including at least one of the following a-f:

a. Uu satisfies that the RSRP is lower than the threshold 11.

b. PC5 satisfies that the RSRP is higher than the threshold 21.

c. The above two conditions need to be met at the same time.

The above RSRP can also be replaced by RSRQ or SINR, CBR, etc. Since this group is an interference condition, the comparison relationship with the threshold needs to be completely opposite to RSRP.

d. Uu satisfies RSRQ/SINR higher than the threshold 12.

e. PC5 satisfies that RSRQ/SINR/CBR is lower than the threshold 22.

f. The above two conditions need to be met at the same time.

In general, only one set of RSRP, RSRQ, SINR, and CBR meets the conditions.

In general, since the relay link is different from the Uu link, the conditional switching execution criterion of the relay link (candidate relay) is generally configured independently of the conditional switching execution criterion of the Uu link (candidate cell); of course, in very special cases, Multiplexing is also not excluded. For example, the execution conditions are all scenarios where the quality of the source cell link is sufficiently poor, that is, conditional switching is performed. At this time, the candidate is not evaluated, so the two types of links do not reflect the difference.

It should be noted that the relay UE ID and configuration are usually one-to-one, that is, a candidate relay UE is given a dedicated set of configurations, but there can be only one set of execution criteria for the conditional handover of the candidate relay UE, that is, all candidate relay UEs Judging that the execution conditions are consistent, or a set of candidates, or even a set of candidates, depends on the configuration and requirements.

Step 5: The remote UE1 receives the conditional handover reconfiguration signaling, responds to the completion of the conditional handover reconfiguration signaling, and then starts evaluating the conditional handover according to the configured execution criteria of the conditional handover.

Step 6: When the remote UE1 finds that the relay UE1 satisfies the relay condition handover execution criterion, it can disconnect the source cell connection and access the relay link, which can include at least one of the following:

1) Through the Discovery process between remote UE1 and relay UE2, first understand the basic relay architecture requirements.

2) Establish a PC5 unicast connection between the two UEs, activate security, interaction capabilities, etc., and prepare for subsequent communication.

3) Remote UE1 and relay UE2 then exchange relevant configurations on the PC5 interface according to the configuration and mapping relationship of the PC5 RLC bearer obtained from the base station, so that the configurations at both ends are consistent. Generally speaking, the uplink data path is configured by remoteUE1, and the downlink data path It is configured by the relay UE2, which is based on the principle of configuring the TX end on the PC5 interface. Of course, it is not excluded in the relay architecture. Since the relay is more dominant, it can be configured by the relay, or each can be executed through the configuration given by gNB. That's it.

4) After the PC5 link is established, remote UE1 sends a reconfiguration complete message to the target gNB through the PC5 link-relay UE2-Uu link. According to the previous assumption, the target gNB is still unchanged, the same gNB, but due to the data The path has changed, and gNB can know that remote UE1 has completed the access to the relay link according to the new data path, that is, the conditional switching process has been completed, and the data transmission on the new link can be started, and if there are other candidate cells , a cancel signaling can be sent to inform the remote UE1 that the conditional handover is suspended/completed.

After accessing through a new link, in this example, since the serving gNB has not changed, PDCPsecurity does not need to be updated, and it can be continued directly. For E2E RLC AM RB, statusreport can be triggered at the PDCP layer and then re-reported according to the status report The transfer operation recovers the data loss caused by the switching path, so as to achieve the purpose of lossless switching.

Embodiment two

This embodiment mainly introduces that the remote terminal switches to the Uu link provided by the network node through conditional switching.

In this embodiment, it is assumed that the current serving path of remote UE3 is an indirect link, that is, a path such as remote UE3->relay UE4->serving gNB. Since the remote UE is currently in a connected state, there is an active RRC connection (connection) between it and the serving gNB, so UL/DL RRC signaling can be transmitted end-to-end. The conditional switching performed by the remote UE3 may include the following steps:

Step 0: the remote UE3 needs to report to the base station itself the capability information about the conditional handover, where the capability information is the same as that shown in the first embodiment. In short, the base station needs to know whether UE3 supports relay link conditional handover or ordinary conditional handover (there is another possibility here, since the target/candidate node is a legacy cell, it can be sufficient for UE3 to support ordinary conditional handover Only when the ability of the function is enabled can the corresponding condition switch be performed.

Step 1: The serving gNB of remote UE3 configures measurement for it. Since this example involves the conditional switching of the candidate as a cell, the measurement configuration is similar to the existing one. There is a difference because the remote UE3 is currently in the relay link, so for The Uu measurement of its serving cell still belongs to the neighboring cell measurement, not the local cell measurement, which is a key point different from the usual measurement configuration.

Step 2: UE3 performs measurement according to the measurement configuration of the network, and when the conditions for reporting the measurement are met, UE3 reports the measurement result to the network.

Step 3: The serving base station receives the measurement report result of UE3. If it finds that the configuration requirements for conditional handover are met, for example, the current relay link of UE3 is not good, the RSRP of PC5 is lower than a certain threshold, and there are alternative cells available around UE3 that can be It provides potential Uu link transmission, so you can consider this cell as its candidate node. It should be noted that the candidate cell can be the serving cell of the current UE3 at this time, or other cells other than the serving cell.

If the candidate cell is under the control of the same serving gNB (referring to the same serving gNB as UE3), in the most direct case, the candidate cell is a cell under the same serving gNB, then the serving gNB can directly operate on the candidate cell through internal operations. Perform admission and configuration information generation.

Step 4: The serving base station sends conditional handover reconfiguration signaling to remote UE3, which includes candidatecell ID information and configuration information, as well as conditional handover execution criteria.

Step 5: The remote UE3 receives the conditional handover reconfiguration signaling, responds to the completion of the conditional handover reconfiguration signaling, and then starts evaluating the conditional handover according to the configured execution criteria of the conditional handover.

Step 6: When the remote UE3 finds that the candidate cell satisfies the conditional switching execution criteria, it can disconnect the source relay link and access the Uu link, which may include at least one of the following steps:

1) Initiate a random access procedure to the target cell.

2) After the random access is successful, send reconfiguration completion information.

3) The base station side receives configuration completion on the new link, and knows that the UE has completed the conditional handover. Then, a cancel command may be sent to other candidate cells or relay links to stop preparations for conditional handover and resource reservation.

4) UE3 implements the RLC bearer that releases the PC5 interface segment of the relay link, or even the PC5 connection.

After accessing through a new link, in this example, since the serving gNB has not changed, PDCPsecurity does not need to be updated, and it can be continued directly. For E2E RLC AM RB, statusreport can be triggered at the PDCP layer and then re-reported according to the status report The transfer operation recovers the data loss caused by the switching path, so as to achieve the purpose of lossless switching.

Embodiment three

This embodiment introduces the situation that the candidate cell and the candidate relay are configured for the first terminal at the same time.

The above two embodiments respectively introduce the two most basic conditional handover processes involving remote UE. This embodiment continues to introduce more complex situations on the basis of the previous ones, and some of the same content can refer to the previous embodiments, and will not be described again.

When a UE is in the Uu direct link and directly communicates with its serving cell, or a remote UE is in the indirect link and connects to its serving cell through a relay UE, regardless of the two cases, it can be configured in the conditional handover , configure the candidate network node (candidate cell) and the candidate relay node (candidate relay) at the same time, and have a corresponding target configuration for each candidate node, and have their own conditional switching execution criteria for different types.

This embodiment mainly introduces the selection behavior of the UE when one or more candidate cells and one or more candidate relays simultaneously satisfy their respective conditional handover execution criteria.

Since Uu link and relay link have their own different characteristics, for example, Uu link has better resource utilization efficiency and system efficiency because it is a one-hop connection, and the deployment of larger cell coverage is more scientific, which supports UE service coverage and continuity Better, and the relay link is the opposite, but the advantage of the relay link is that it is closer to the remote, which brings a better power-saving experience to the remote UE, and provides the possibility for cooperative transmission between user equipment, so one of the following methods can be used :

Method 1: When there are candidate cell(s) and candidate relay(s) that meet their respective condition switching execution criteria at the same time, the target node is selected in the candidate cell(s) first. If there are multiple cells, which cell can be selected specifically It is handed over to the UE for implementation, such as considering factors such as beam conditions and beam quality.

Method 2: When there are candidate cell(s) and candidate relay(s) that meet their respective conditional switching execution criteria at the same time, the target node is selected in the candidate relay(s) first. If there are multiple relays, which relay can be selected specifically It is handed over to the UE for implementation, such as considering factors such as distance, channel conditions, relay capabilities, and even binding and belonging relationships between devices (such as between mobile phones and wearable devices belonging to the same user).

Method 3: When the UE is more inclined to service performance, follow method 1; when the UE is more inclined to power saving performance, follow method 2.

Mode 4: The network side decides to use mode 1 or mode 2 through configuration, where the configuration mode may be pre-configured signaling, SIB signaling, dedicated signaling, and so on.

Since the above-mentioned methods have their own advantages and disadvantages, other dimensions or conditions can be further introduced to assist in the selection of target nodes, for example, including at least one of the following:

1) Uu link quality condition, when Uu RSRP is higher than the threshold or RSRQ/SINR is lower than the threshold, it is necessary to preferentially select candidate cell(s). If there are multiple cells, the specific selection of which cell can be handed over to the UE for implementation, for example Consider factors such as beam conditions and beam quality; otherwise, choose candidate relay(s) first, and if there are multiple relays, which relay to choose can be handed over to the UE for implementation, such as considering distance, channel conditions, relay capabilities, and even between devices Factors such as the binding and attribution relationship (such as between mobile phones and wearable devices belonging to the same user).

2) PC5 link quality condition, when PC5 RSRP is higher than the threshold or RSRQ/CBR is lower than the threshold, the candidate relay(s) is preferred. If there are multiple relays, which relay to choose can be handed over to the UE for implementation. For example, consider Factors such as distance, channel conditions, relay capabilities, and even binding and belonging relationships between devices (such as between mobile phones and wearable devices belonging to the same user); otherwise, candidate cell(s) need to be selected first, if there are many The specific choice of which cell can be handed over to the UE for implementation, for example, considering factors such as beam conditions and beam quality.

3) Combination conditions between the above two groups, when Uu RSRP is higher than the threshold or RSRQ/SINR is lower than the threshold and when PC5 RSRP is lower than the threshold or RSRQ/CBR is higher than the threshold, the candidate cell(s) is preferred, otherwise, Candidate relay(s) are preferred.

4) Combined conditions, when PC5 RSRP is higher than the threshold or RSRQ/CBR is lower than the threshold and Uu RSRP is lower than the threshold or RSRQ/SINR is higher than the threshold, the candidate relay(s) is preferred, otherwise, the candidate cell(s) is preferred.

5) Considering the load and other factors, when the Uu load is lower than the threshold and or the relay load is higher than the threshold and or the relay UE power is lower than the threshold, the candidate cell(s) is preferentially selected, otherwise the candidate relay(s) is preferentially selected.

6) Still considering the load and other factors, when the Uu load is higher than the threshold and or the relay load is lower than the threshold and or the relay UE power is higher than the threshold, the candidate relay(s) is preferred, otherwise the candidate cell(s) is preferred.

7) The network may not specify any selection rules at all, and it is completely left to the UE to implement, and the UE selects according to its own preference and algorithm.

Embodiment four

This embodiment involves conditional handover across base stations, and mainly introduces the interaction process between the network side device and the target network side device (Xn interface/intra-gNB/inter-gNB)

In the foregoing embodiments, most of the scenarios involve intra-gNB, that is, the source node and the target node are under the control of the same base station, so interface interaction between base stations is not required. There is another large type of scenario, which is inter-gNB, that is, the source node and the target node are under the control of different base stations. In this case, the interface interaction between base stations needs to be considered.

It needs to be explained that due to the limited time during the project research of SL Relay R17, some more complex scenarios are not supported in the first version, for example, the inter-gNB handover of remote UE is not supported, and the remote UE is not supported from relay link1 to relay link2 switching, etc. Then, because the switching scene itself is limited, it is reasonable to assume that the switching scene is not supported, and the conditional switching scene is not supported either. In order to avoid these unsupported conditional handover scenarios, it is avoided by the implementation algorithm of the base station. For example, the base station will not configure inter-gNB or conditional handover between two relaylinks for a remote UE, or it can also be avoided by the UE. For example, the UE does not report the measurement results of the inter-gNB or two relay links when reporting, or when an unsupported handover scenario is configured on the network side, the UE will not select an unsupported candidate node as the target node.

In this embodiment, the conditional handover of remote UE from relay UE1/cell1 under gNB1 to cell2/relay UE2 under gNB2 is taken as an example to illustrate the interface process between base stations in the scenario of inter-base stations.

First, at the stage of measurement configuration, if there is no restriction, the configuration of the serving base station is to measure all neighboring cells, and the UE will report when the measurement conditions of neighboring cells are met. Therefore, the measurement results of these neighboring cells that meet the conditions may have both intra- The cell of gNB also has the cell of inter-gNB, and the UE does not need to distinguish them, they report them together, and the network selects the algorithm.

The relay measurement is also similar. In the measurement configuration and measurement reporting phase, both the relay measurement results under the intra-gNB and the relay measurement results under the inter-gNB can be included. The UE does not need to distinguish them and report them together. The algorithm is selected by the network.

Secondly, when the network selects a cross-base station cell or relay as a candidate node, the source base station needs to send a handover request (handover request) signaling to the target base station to negotiate the admission and new configuration of the remote UE on the new link. Among them, the handover request signaling also needs to carry all configurations of the remote UE on the source link for reference by the target node. Keeping the original configuration as far as possible is the best for UE service continuity. For example, if the source link is a relay link, the handover request can carry not only remote UE end-to-end bearer configuration and layer configuration, but also PC5 link configuration and the mapping relationship between end-to-end bearer and PC5 RLC bearer. But there is also a simplified method, which only carries remote UE end-to-end PDCP and above configurations, and the default PC5 RLC bearer and end-to-end bearer are one-to-one sequential mapping.

The Handover request signaling can also carry target node information that meets the conditions, such as target cell ID or target relay UE ID, and the target relay can also carry the serving cell information of the relay at the same time, so that the target base station can find the correct relay UE.

When the target gNB receives the Handover request message, it accepts and configures it. If it is a cell, the gNB can proceed directly. If it is a relay UE, the target gNB can optionally configure a relay node for the new configuration. The node returns Handover request acknowledgment, carrying all configurations of the new node.

The source node receives the configuration of the target side. In the process of conditional switching, generally more than one target node is configured. The source node organizes them to form the reconfiguration signaling of conditional switching, and carries the conditional switching execution of each type of target node. The criteria are sent to the remote UE together.

The Remote UE receives the conditional handover signaling and returns a completion response. And start to evaluate the candidate node. When there is a node that meets the execution criteria, select it as the target node, initiate detach to the source, connect to the target, and send a reconfiguration completion signaling.

The target side notifies the source that it has been connected correctly, the source cancels other candidate nodes, and the conditional switching is completed.

Among them, a certain amount of early SN status transfer and early data forwarding can be performed between two gNBs, and they can be performed during the Xn process of conditional handover. The advantage is to prepare for UE access in advance, especially for low-latency and high-reliability services It is more beneficial, but the problem is that there may be only one of the multiple target nodes that is really useful, and the rest are backup and waste, and the time point of UE access is also uncertain, and it is easy to cause the state and data to become outdated. It is also possible that after the UE actually accesses the target node, the target node then requests SN status transfer and data forwarding from the source node. The latter method is more targeted and has higher resource utilization and network efficiency. Which one to use can be determined through negotiation between the source node and the target node according to the service characteristics, the load capacity of the source node and the target node, etc.

The purpose of SN status transfer and data forwarding is to ensure the service continuity of the UE handover process and ensure the service reliability of the UE.

It should be noted that, for the conditional switching method provided in the embodiment of the present application, the execution subject may be the conditional switching device, or a control module in the conditional switching device for executing the conditional switching method. In the embodiment of the present application, the condition switching device provided in the embodiment of the present application is described by taking the condition switching device executing the condition switching method as an example.

Fig. 4 is a schematic structural diagram of a conditional switching device according to an embodiment of the present application, and the device may correspond to a terminal in other embodiments. As shown in FIG. 4 , the device 400 includes the following modules.

The receiving module 402 may be configured to receive reconfiguration signaling of conditional handover; wherein, the reconfiguration signaling includes relevant information of candidate nodes, and the candidate nodes include network nodes and/or relay nodes.

The conditional switching module 404 may be configured to perform a conditional switching process according to the reconfiguration signaling.

In the embodiment of the present application, the reconfiguration signaling received by the device 400 includes candidate nodes, and the candidate nodes include network nodes and/or relay nodes, so that the first terminal can switch to the network node or relay node, which can solve the problem of related technologies Because it does not support the conditional handover process related to the secondary link relay scenario, the handover success rate of the terminal is improved.

Optionally, as an embodiment, when the device is a remote terminal, the candidate nodes include the network node and/or the relay node; or when the device is a Uu link terminal In some cases, the candidate node includes one of the following: the network node and the relay node; and the relay node.

Optionally, as an embodiment, the reconfiguration signaling includes at least one of the following: information of the network node; configuration information of the network node; a first conditional handover execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second conditional handover execution condition corresponding to the relay node.

Optionally, as an embodiment, the second conditional handover execution condition includes at least one of the following: the link quality of the Uu link is lower than the first threshold; the link quality of the relay link is higher than the second threshold.

Optionally, as an embodiment, the first conditional switching execution condition and the second conditional switching execution condition are independently configured; or the second conditional switching execution condition multiplexes the first conditional switching execution condition .

Optionally, as an embodiment, the conditional switching module 404 may be configured to: disconnect the source network node or the source network node when the target relay node among the candidate nodes satisfies the second conditional switching execution condition The relay node is connected, and the relay link provided by the target relay node is accessed.

Optionally, as an embodiment, the conditional switching module 404 may be used for at least one of the following: performing a discovery process with the target relay node; establishing a PC5 connection with the target relay node; Send a reconfiguration complete message.

Optionally, as an embodiment, the conditional switching module 404 may be configured to: disconnect the source relay node from the source relay node when the target network node among the candidate nodes satisfies the first conditional switching execution condition to access the Uu link provided by the target network node.

Optionally, as an embodiment, the conditional switching module 404 may be used for at least one of the following: release the radio link control RLC bearer of the PC5 interface with the source relay node; PC5 connection between relay nodes.

Optionally, as an embodiment, the reconfiguration signaling includes conditional handover execution conditions, and the conditional handover module 404 may be configured to: when M network nodes and N relay nodes simultaneously meet their respective conditional handover execution conditions When the condition is met, a target network node is selected from the M network nodes, or a target relay node is selected from the N relay nodes according to preset rules; wherein, M and N are positive integers.

Optionally, as an embodiment, the foregoing preset rule may include one of the following.

1) Selecting a target network node from the M network nodes preferentially.

2) Selecting a target relay node from the N relay nodes preferentially.

3) When the service performance requirements of the device meet the first condition, preferentially select a target network node from the M network nodes.

4) When the requirement of the device on power saving performance satisfies the second condition, preferentially select a target relay node from the N relay nodes.

5) According to the configuration, it is determined to preferentially select a target network node from the M network nodes or preferentially select a target relay node from the N relay nodes.

Optionally, as an embodiment, the preset rule further includes at least one of the following: Uu link quality condition, PC5 link quality condition, Uu link load condition, PC5 link load condition, among the N The power condition of the relay node.

Optionally, as an embodiment, the selecting a target relay node from the N relay nodes includes: selecting a target relay node from the N relay nodes according to at least one of the following: Distance, channel condition, relay capability, binding and belonging relationship between terminals.

Optionally, as an embodiment, the device 400 further includes a sending module, which may be used to: send capability information of conditional handover, where the capability information is used to indicate at least one of the following: the device supports Uu link conditional handover ; The device supports relay link conditional switching.

Optionally, as an embodiment, the receiving module 402 may be configured to receive measurement configuration signaling for condition switching; wherein, the measurement configuration signaling includes a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following:

1) When the Uu link quality is lower than the third threshold, start measuring the relay nodes in the candidate nodes;

2) The measurement results of the relay nodes in the candidate nodes are reported periodically or triggered by events;

3) Measure the relay nodes among the candidate nodes based on the discovery signal and/or the data signal.

The device 400 according to the embodiment of the present application can refer to the process of the method 200 corresponding to the embodiment of the present application, and each unit/module in the device 400 and the above-mentioned other operations and/or functions are respectively in order to realize the corresponding process in the method 200, And can achieve the same or equivalent technical effect, for the sake of brevity, no more details are given here.

The conditional switching device in the embodiment of the present application may be a device, a device with an operating system or an electronic device, or a component, an integrated circuit, or a chip in a terminal. The apparatus or electronic equipment may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include, but not limited to, the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television ( television, TV), teller machines or self-service machines, etc., are not specifically limited in this embodiment of the present application.

The condition switching device provided by the embodiment of the present application can realize each process realized by the method embodiments in FIG. 2 to FIG. 3 and achieve the same technical effect. To avoid repetition, details are not repeated here.

Fig. 5 is a schematic structural diagram of a conditional switching apparatus according to an embodiment of the present application, and the apparatus may correspond to network-side devices in other embodiments. As shown in FIG. 5 , the device 500 includes the following modules.

The sending module 502 may be configured to send reconfiguration signaling for conditional handover, where the reconfiguration signaling is used by the first terminal to perform a conditional handover process; wherein, the reconfiguration signaling includes information about candidate nodes, and the candidate node Nodes include network nodes and/or relay nodes.

In the conditional handover method provided by the embodiment of the present application, the device 500 sends the reconfiguration signaling of the conditional handover. The reconfiguration signaling includes candidate nodes, and the candidate nodes include network nodes and/or relay nodes, so that the first terminal can switch to the network node. The node or relay node can solve the conditional handover process related to the secondary link relay scenario in the related art, and improve the handover success rate of the terminal.

Optionally, as an embodiment, when the first terminal is a remote terminal, the candidate node includes the network node and/or the relay node; or the first terminal is Uu In the case of a link terminal, the candidate node includes one of the following: the network node and the relay node; and the relay node.

Optionally, as an embodiment, the reconfiguration signaling includes at least one of the following: information of the network node; configuration information of the network node; a first conditional handover execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second conditional handover execution condition corresponding to the relay node.

Optionally, as an embodiment, the second conditional handover execution condition includes at least one of the following: the link quality of the Uu link is lower than the first threshold; the link quality of the relay link is higher than the second threshold.

Optionally, as an embodiment, the first conditional switching execution condition and the second conditional switching execution condition are independently configured; or the second conditional switching execution condition multiplexes the first conditional switching execution condition .

Optionally, as an embodiment, the reconfiguration signaling includes a conditional handover execution condition, and the reconfiguration signaling is used for the first terminal to perform the following process: when M network nodes and N relay nodes simultaneously When the respective conditional handover execution conditions are met, a target network node is selected from the M network nodes, or a target relay node is selected from the N relay nodes according to preset rules; wherein, M and N are positive integers.

Optionally, as an embodiment, the foregoing preset rule may include one of the following.

1) Selecting a target network node from the M network nodes preferentially.

2) Selecting a target relay node from the N relay nodes preferentially.

3) In the case that the first terminal's requirement on service performance satisfies the first condition, preferentially selecting a target network node from the M network nodes.

4) In the case that the first terminal's requirement on power saving performance satisfies the second condition, preferentially select a target relay node from the N relay nodes.

5) According to the configuration, it is determined to preferentially select a target network node from the M network nodes or preferentially select a target relay node from the N relay nodes.

Optionally, as an embodiment, the preset rule further includes at least one of the following: Uu link quality condition, PC5 link quality condition, Uu link load condition, PC5 link load condition, among the N The power condition of the relay node.

Optionally, as an embodiment, the selecting a target relay node from the N relay nodes includes: selecting a target relay node from the N relay nodes according to at least one of the following: Distance, channel condition, relay capability, binding and belonging relationship between terminals.

Optionally, as an embodiment, the apparatus 500 further includes a receiving module, which may be used to receive capability information of conditional handover, where the capability information is used to indicate at least one of the following: the first terminal supports Uu link conditional handover; The first terminal supports relay link conditional switching.

Optionally, as an embodiment, the sending module 502 may also be configured to send measurement configuration signaling for conditional handover; wherein, the measurement configuration signaling includes a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following.

1) When the quality of the Uu link is lower than the third threshold, the first terminal starts to measure the relay nodes among the candidate nodes.

2) The first terminal reports the measurement results of the relay nodes in the candidate nodes periodically or triggered by events.

3) The first terminal measures the relay nodes among the candidate nodes based on the discovery signal and/or the data signal.

Optionally, as an embodiment, the sending module 502 may also be configured to send a handover request message to the target network side device, where the handover request message is used to determine the configuration of the first terminal in the target link after handover information.

Optionally, as an embodiment, the handover request message further includes at least one of the following: configuration information of the first terminal in the link before the handover; target network nodes and/or target network nodes that meet conditional handover execution conditions Information about relay nodes.

Optionally, as an embodiment, the apparatus 500 may also be configured to perform at least one of the following with the target network side device: serial number state transfer; data forwarding.

The device 500 according to the embodiment of the present application can refer to the process of the method 300 corresponding to the embodiment of the present application, and each unit/module in the device 500 and the above-mentioned other operations and/or functions are respectively in order to realize the corresponding process in the method 300, And can achieve the same or equivalent technical effect, for the sake of brevity, no more details are given here.

Optionally, as shown in FIG. 6 , this embodiment of the present application further provides a communication device 600, including a processor 601, a memory 602, and programs or instructions stored in the memory 602 and operable on the processor 601, For example, when the communication device 600 is a terminal, when the program or instruction is executed by the processor 601, each process of the above-mentioned conditional switching method embodiment can be realized, and the same technical effect can be achieved. When the communication device 600 is a network-side device, when the program or instruction is executed by the processor 601, each process of the above-mentioned conditional switching method embodiment can be achieved, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

The embodiment of the present application also provides a terminal, including a processor and a communication interface, the processor is used to execute the conditional handover process according to the reconfiguration signaling, and the communication interface is used to receive the reconfiguration signaling of the conditional handover; wherein, the The reconfiguration signaling includes relevant information of candidate nodes, and the candidate nodes include network nodes and/or relay nodes. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 7 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.

The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, and a processor 710, etc. at least some of the components.

Those skilled in the art can understand that the terminal 700 may also include a power supply (such as a battery) for supplying power to various components, and the power supply may be logically connected to the processor 710 through the power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 7 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine some components, or arrange different components, which will not be repeated here.

It should be understood that, in the embodiment of the present application, the input unit 704 may include a graphics processor (Graphics Processing Unit, GPU) 7041 and a microphone 7042, and the graphics processor 7041 is compatible with the image capture device (such as Camera) to process the image data of still pictures or videos. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes a touch panel 7071 and other input devices 7072 . The touch panel 7071 is also called a touch screen. The touch panel 7071 may include two parts, a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, and joysticks, which will not be repeated here.

In the embodiment of the present application, the radio frequency unit 701 receives the downlink data from the network side device, and processes it to the processor 710; in addition, sends the uplink data to the network side device. Generally, the radio frequency unit 701 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 709 can be used to store software programs or instructions as well as various data. The memory 709 may mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area may store an operating system, an application program or instructions required by at least one function (such as a sound playback function, an image playback function, etc.) and the like. In addition, the memory 709 may include a high-speed random access memory, and may also include a non-transitory memory, wherein the non-transitory memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. For example at least one disk storage device, flash memory device, or other non-transitory solid state storage device.

The processor 710 may include one or more processing units; optionally, the processor 710 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs or instructions, etc., Modem processors mainly handle wireless communications, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 710 .

Wherein, the radio frequency unit 701 may be configured to perform a conditional handover process according to the reconfiguration signaling.

The processor 710 may be configured to receive reconfiguration signaling of conditional handover; wherein, the reconfiguration signaling includes relevant information of candidate nodes, and the candidate nodes include network nodes and/or relay nodes.

In this embodiment of the present application, the reconfiguration signaling received by the terminal 700 includes candidate nodes, and the candidate nodes include network nodes and/or relay nodes, so that the first terminal can switch to the network node or relay node, which can solve related technical problems. Because it does not support the conditional handover process related to the secondary link relay scenario, the handover success rate of the terminal is improved.

The terminal 700 provided in the embodiment of the present application can also implement the various processes of the foregoing conditional switching method embodiment, and can achieve the same technical effect. To avoid repetition, details are not repeated here.

The embodiment of the present application also provides a network side device, including a processor and a communication interface, the communication interface is used to send reconfiguration signaling for conditional handover, and the reconfiguration signaling is used for the first terminal to perform a conditional handover process; wherein, The reconfiguration signaling includes information about candidate nodes, where the candidate nodes include network nodes and/or relay nodes. The network-side device embodiment corresponds to the above-mentioned network-side device method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in FIG. 8 , the network side device 800 includes: an antenna 81 , a radio frequency device 82 , and a baseband device 83 . The antenna 81 is connected to a radio frequency device 82 . In the uplink direction, the radio frequency device 82 receives information through the antenna 81, and sends the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes the information to be sent and sends it to the radio frequency device 82 , and the radio frequency device 82 processes the received information and sends it out through the antenna 81 .

The foregoing frequency band processing device may be located in the baseband device 83 , and the method performed by the network side device in the above embodiments may be implemented in the baseband device 83 , and the baseband device 83 includes a processor 84 and a memory 85 .

Baseband device 83 for example can comprise at least one baseband board, and this baseband board is provided with a plurality of chips, as shown in Fig. The operation of the network side device shown in the above method embodiments.

The baseband device 83 may further include a network interface 86 for exchanging information with the radio frequency device 82, such as a common public radio interface (common public radio interface, CPRI for short).

Specifically, the network-side device in this embodiment of the present application also includes: instructions or programs stored in the memory 85 and operable on the processor 84, and the processor 84 calls the instructions or programs in the memory 85 to execute the modules shown in FIG. 5 To avoid duplication, the method of implementation and to achieve the same technical effect will not be repeated here.

The embodiment of the present application also provides a readable storage medium, the readable storage medium stores a program or an instruction, and when the program or instruction is executed by a processor, each process of the above-mentioned condition switching method embodiment is realized, and the same To avoid repetition, the technical effects will not be repeated here.

Wherein, the processor may be the processor in the terminal described in the foregoing embodiments. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above-mentioned conditional switching method embodiment Each process can achieve the same technical effect, so in order to avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , CD-ROM), including several instructions to enable a terminal (which may be a mobile phone, computer, server, air conditioner, or network-side device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims (36)

1. A conditional access method, comprising:

the first terminal receives a reconfiguration signaling of the conditional switching CHO; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes;

and the first terminal executes a conditional switching process according to the reconfiguration signaling.

2. The method of claim 1,

in the case that the first terminal is a remote terminal, the candidate node comprises the network node and/or the relay node;

in a case that the first terminal is a user network universal interface Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

3. The method according to claim 1 or 2, wherein the reconfiguration signalling comprises at least one of:

information of the network node; configuration information of the network node; a first condition switch execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second condition corresponding to the relay node switches the execution condition.

4. The method of claim 3, wherein the second conditional switch execution condition comprises at least one of:

the link quality of the Uu link is lower than a first threshold;

the link quality of the relay link is above a second threshold.

5. The method of claim 3,

the first conditional switch execution condition and the second conditional switch execution condition are configured independently; or

The second conditional switch execution condition multiplexes the first conditional switch execution condition.

6. The method of claim 3, wherein the first terminal performing a conditional handover procedure according to the reconfiguration signaling comprises:

and under the condition that a target relay node in the candidate nodes meets the second conditional handover execution condition, the first terminal disconnects the source network node or the source relay node and accesses a relay link provided by the target relay node.

7. The method of claim 6, wherein the accessing the relay link provided by the target relay node comprises at least one of:

performing a discovery process with the target relay node;

establishing PC5 connection with the target relay node;

the reconfiguration complete message is sent over the PC5 link.

8. The method of claim 3, wherein the first terminal performing a conditional handover procedure according to the reconfiguration signaling comprises:

and under the condition that a target network node in the candidate nodes meets the first conditional handover execution condition, the first terminal disconnects with a source relay node and accesses a Uu link provided by the target network node.

9. The method of claim 8, further comprising at least one of:

releasing Radio Link Control (RLC) bearing of a PC5 interface between the source relay node and the source relay node;

releasing the PC5 connection with the source relay node.

10. The method of claim 1, wherein the reconfiguration signaling comprises a conditional handover execution condition, and wherein the performing a conditional handover procedure according to the reconfiguration signaling comprises:

when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule;

wherein M and N are positive integers.

11. The method of claim 10, wherein the preset rule comprises one of:

preferentially selecting a target network node from the M network nodes;

preferentially selecting a target relay node from the N relay nodes;

preferentially selecting a target network node from the M network nodes under the condition that the requirement of the first terminal on service performance meets a first condition;

preferentially selecting a target relay node from the N relay nodes under the condition that the requirement of the first terminal on the power saving performance meets a second condition;

and preferentially selecting a target network node from the M network nodes or preferentially selecting a target relay node from the N relay nodes according to configuration determination.

12. The method of claim 11, wherein the preset rules further comprise at least one of: uu link quality condition, PC5 link quality condition, uu link load condition, PC5 link load condition, and power condition of the N relay nodes.

13. The method of claim 11, wherein the selecting a target relay node from the N relay nodes comprises:

selecting a target relay node from the N relay nodes according to at least one of the following conditions: distance, channel conditions, relay capabilities, binding and affiliation between terminals.

14. The method of claim 1, wherein before the first terminal receives the reconfiguration signaling for the conditional handover, the method further comprises:

the first terminal sends capability information of conditional switching, wherein the capability information is used for indicating at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition handover.

15. The method of claim 14, wherein after the step of the first terminal sending capability information for conditional handover and before the step of the first terminal receiving reconfiguration signaling for conditional handover, the method further comprises: the first terminal receives a measurement configuration signaling of condition switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions:

under the condition that the Uu link quality is lower than a third threshold, the first terminal starts to measure the relay nodes in the candidate nodes;

the measurement result of the first terminal to the relay node in the candidate nodes is reported periodically or is reported triggered by an event;

the first terminal measures relay nodes in the candidate nodes based on discovery signals and/or data signals.

16. A conditional access method, comprising:

the network side equipment sends a reconfiguration signaling of the condition switching, wherein the reconfiguration signaling is used for the first terminal to execute the condition switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

17. The method of claim 16,

in the case that the first terminal is a remote terminal, the candidate node comprises the network node and/or the relay node;

in a case that the first terminal is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

18. The method according to claim 16 or 17, wherein the reconfiguration signalling comprises at least one of:

information of the network node; configuration information of the network node; a first condition switch execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second condition corresponding to the relay node switches the execution condition.

19. The method of claim 18, wherein the second conditional switch execution condition comprises at least one of:

the link quality of the Uu link is lower than a first threshold;

the link quality of the relay link is higher than the second threshold.

20. The method of claim 18,

the first conditional switch execution condition and the second conditional switch execution condition are configured independently; or

The second conditional switch execution condition multiplexes the first conditional switch execution condition.

21. The method of claim 16, wherein the reconfiguration signaling includes a conditional handover execution condition, and wherein the reconfiguration signaling is used for the first terminal to perform the following procedures:

when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule;

wherein M and N are positive integers.

22. The method of claim 21, wherein the predetermined rule comprises one of:

preferentially selecting a target network node from the M network nodes;

preferentially selecting a target relay node from the N relay nodes;

preferentially selecting a target network node from the M network nodes under the condition that the requirement of the first terminal on service performance meets a first condition;

preferentially selecting a target relay node from the N relay nodes under the condition that the requirement of the first terminal on the power saving performance meets a second condition;

and preferentially selecting a target network node from the M network nodes or preferentially selecting a target relay node from the N relay nodes according to configuration determination.

23. The method of claim 22, wherein the preset rules further comprise at least one of: uu link quality condition, PC5 link quality condition, uu link load condition, PC5 link load condition, and power condition of the N relay nodes.

24. The method of claim 22, wherein the selecting the target relay node from the N relay nodes comprises:

selecting a target relay node from the N relay nodes according to at least one of the following conditions: distance, channel conditions, relay capabilities, binding and affiliation between terminals.

25. The method of claim 16, wherein before the network side device sends the reconfiguration signaling for the conditional handover, the method further comprises:

the network side equipment receives capability information of condition switching, wherein the capability information is used for indicating at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition handover.

26. The method of claim 25, wherein before the network side device sends the reconfiguration signaling for the conditional handover, the method further comprises: the network side equipment sends a measurement configuration signaling of condition switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions:

under the condition that the Uu link quality is lower than a third threshold, the first terminal starts to measure the relay nodes in the candidate nodes;

the measurement result of the first terminal to the relay node in the candidate nodes is reported periodically or is reported triggered by an event;

the first terminal measures relay nodes in the candidate nodes based on discovery signals and/or data signals.

27. The method of claim 16, further comprising:

and the network side equipment sends a switching request message to target network side equipment, wherein the switching request message is used for determining the configuration information of the first terminal in the switched target link.

28. The method of claim 27, wherein the handover request message further comprises at least one of:

configuration information of the first terminal in a link before switching;

information of target network nodes and/or target relay nodes that meet the conditional handover execution conditions.

29. The method of claim 28, further comprising: the network side equipment and the target network side equipment execute at least one of the following steps:

transferring the state of the serial number;

and (4) forwarding data.

30. A condition switching apparatus, comprising:

a receiving module, configured to receive a reconfiguration signaling for conditional switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes;

and the condition switching module is used for executing the condition switching process according to the reconfiguration signaling.

31. The apparatus of claim 30,

in the case that the apparatus is a remote terminal, the candidate node comprises the network node and/or the relay node;

in a case where the apparatus is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

32. A condition switching apparatus, comprising:

a sending module, configured to send a reconfiguration signaling for conditional switching, where the reconfiguration signaling is used for a first terminal to perform a conditional switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

33. The method of claim 32,

in the case that the first terminal is a remote terminal, the candidate node comprises the network node and/or the relay node;

in a case that the first terminal is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

34. A terminal comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the conditional switching method of any of claims 1 to 15.

35. A network-side device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the conditional switching method according to any one of claims 16 to 29.

36. A readable storage medium, characterized in that a program or instructions are stored thereon, which when executed by a processor implement the conditional switching method according to any one of claims 1 to 15, or the conditional switching method according to any one of claims 16 to 29.

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