WO2022078071A1

WO2022078071A1 - Relay terminal selection method, terminal, and storage medium

Info

Publication number: WO2022078071A1
Application number: PCT/CN2021/114180
Authority: WO
Inventors: 张惠英
Original assignee: 大唐移动通信设备有限公司
Priority date: 2020-10-16
Filing date: 2021-08-24
Publication date: 2022-04-21
Also published as: CN114390634A

Abstract

Embodiments of the present application provide a relay terminal selection method, a terminal, and a storage medium, applied to a first UE communicating with a second UE. The method comprises: when it is determined that selection or reselection of a relay UE is performed, a first UE performs measurement to obtain a first relay candidate result and receives a second relay candidate result sent by a second UE, the first relay candidate result comprising a first relay candidate list satisfying a relay condition and a first channel measurement result list corresponding to the first relay candidate list, and the second relay candidate result being obtained by measurement performed by the second UE and comprising a second relay candidate list satisfying a relay condition and a second channel measurement result list corresponding to the second relay candidate list; and selecting a target relay UE from the first relay candidate list and the second relay candidate list according to the first channel measurement result list and the second channel measurement result list. The embodiments of the present application improve the relay selection efficiency.

Description

Method for selecting relay terminal, terminal and storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application with the application number 202011112958.1, filed on October 16, 2020, entitled "A Relay Terminal Selection Method, Terminal, and Storage Medium", which is incorporated herein by reference in its entirety.

technical field

The present application relates to the field of communication technologies, and in particular, to a method for selecting a relay terminal, a terminal, and a storage medium.

Background technique

In some scenarios, direct communication cannot be performed due to a certain distance between side link (SideLink, SL) terminals (UEs), but both of them are adjacent to third-party UEs. In order to realize inter-UE communication in this case, the The third-party UE can act as a relay (Relay) responsible for data transfer, and the relay is called UE-to-UE Relay. In addition, for the off-network UE, if the off-network UE can communicate with the network, a neighboring on-network UE can be selected for the off-network UE to relay data, and the on-network UE is called UE-to-Network Relay. Whether for UE-to-UE Relay or UE-to-Network Relay, both the remote UE and the Relay UE can move, so the selection and reselection of the Relay UE must be considered.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a method for selecting a relay terminal, a terminal, and a storage medium, so as to solve the problem of low efficiency in selecting a relay in the prior art.

In a first aspect, an embodiment of the present application provides a method for selecting a relay terminal, which is applied to a first UE that communicates with a second terminal UE, and the method includes:

When it is determined to perform the selection or reselection of the relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE, wherein the first relay candidate result It includes a first relay candidate list that satisfies the relay condition and a first channel measurement result list corresponding to the first relay candidate list, and the second relay candidate result is measured by the second UE and includes a second relay candidate list of relay conditions and a second channel measurement result list corresponding to the second relay candidate list;

According to the first channel measurement result list and the second channel measurement result list, a target relay UE is selected from the first relay candidate list and the second relay candidate list.

In a second aspect, an embodiment of the present application provides a terminal, where the terminal is a first terminal UE and communicates with a second UE, including a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

When it is determined to perform the selection or reselection of the relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE, wherein the first relay candidate result includes satisfying A first relay candidate list of relay conditions and a first channel measurement result list corresponding to the first relay candidate list, the second relay candidate result is obtained by the second UE measurement and includes the relay a conditional second relay candidate list and a second channel measurement result list corresponding to the second relay candidate list;

In a third aspect, an embodiment of the present application provides an apparatus for selecting a relay terminal, which is applied to a first UE that communicates with a second terminal UE, including:

a receiving module, configured to obtain the first relay candidate result by measurement by the first UE and receive the second relay candidate result sent by the second UE when the selection or reselection of the relay UE is determined, wherein the first relay candidate result is sent by the second UE. A relay candidate result includes a first relay candidate list satisfying relay conditions and a first channel measurement result list corresponding to the first relay candidate list, and the second relay candidate result is the second UE obtaining and including a second relay candidate list that satisfies the relay condition and a second channel measurement result list corresponding to the second relay candidate list;

A determining module, configured to select and obtain a target relay UE from the first relay candidate list and the second relay candidate list according to the first channel measurement result list and the second channel measurement result list.

In a fourth aspect, an embodiment of the present application provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to cause a processor to execute the method described in the first aspect.

In the method for selecting a relay terminal, the terminal, and the storage medium provided by the embodiments of this application, the first UE obtains the first relay candidate result through measurement and receives the second relay candidate result sent by the second UE, so that the first UE can Determine the channel quality between itself and the candidate relay selected by itself, and can determine the channel quality between the candidate relay selected by the second UE and the candidate relay selected by the second UE and the second UE, so as to be The subsequent selection of the target relay terminal provides conditions; in addition, the first UE directly receives the second relay candidate result sent by the second UE, so that the relationship between the first UE and the candidate UE and between the candidate UE and the second UE is There is no need to establish an additional connection, avoiding the process of establishing a PC5 link between the first UE and multiple candidate UEs when selecting a relay in the prior art, reducing the number of PC5 interfaces, and reducing the number of PC5 interfaces. Following the feedback time of the candidate results, the efficiency of relay selection or reselection is improved.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flowchart of steps of a method for selecting a relay terminal of a first UE in an embodiment of the present application;

2 is a schematic diagram of interaction when determining a target relay UE in the first embodiment of the application;

3 is a schematic diagram of interaction when a target relay UE is determined in the second embodiment of the application;

FIG. 4 is a schematic structural diagram of a UE in an embodiment of the present application;

FIG. 5 is a module block diagram of an apparatus for selecting a relay terminal applied to a first UE in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the LTE system, the communication adopts the mode of centralized control of the network, that is, the uplink and downlink data of the UE are all sent and received under the control of the network. The communication between the UE and the UE is forwarded and controlled by the network. There is no direct communication link between the UE and the UE. In this way, the data transmission between the UE and the network can be referred to as Device to Network. , D2N) transmission.

Device-to-Device (D2D) technology refers to a method in which adjacent terminals can transmit data through a direct link within a short range, without forwarding through a central node (ie, a base station) or through a direct link. The traditional cellular link is used for information transmission between UEs. The link for device-to-device communication is defined as a D2D link. In 3GPP, D2D proximity service includes two categories: D2D discovery and D2D communication. D2D discovery means that a UE uses Evolved-UMTS Terrestrial Radio Access (E-UTRA) to confirm that another UE is nearby; for example, a D2D UE can use this service to find a nearby taxi or find friends in its vicinity, etc. D2D communication means that UEs that are close to each other directly establish a link between the two UEs, thus converting the communication link originally transmitted through the network into a local direct communication link, saving a lot of bandwidth and network efficiency; Or two UEs that are close to each other can use direct link communication to obtain stable, high-speed and low-cost communication services. The proximity service communication is generally performed under the control or assistance of the network side, and the eNB may even dynamically allocate resources for the UE performing the proximity service communication.

In addition, based on the D2D discovery and communication technology, the UE can transmit data with the network or other UEs by means of Relay. Relay in D2D system is divided into UE-to-Network Relay and UE-to-UE Relay. Among them, the way that the UE communicates with the network through the Relay UE is called UE-to-Network Relay. For example, in order to communicate with the network, UE2 outside the network coverage uses UE1 as a Relay node and forwards its own uplink and downlink signals through UE1. UE1 and The communication between UE2 is realized through D2D communication, and the communication between UE1 and the network is realized through cellular communication; the way that UE discovers/communicates with the target UE through Relay UE is called UE-to-UE Relay. The UE4 in the device communicates, and can forward its own information through UE1, wherein the data transmission between UE1 and UE2, and between UE1 and UE4 is realized through D2D communication.

In the above two Relay scenarios, the source UE must first find a Relay UE that can relay data for itself, and the UE needs to be able to transmit data with the source UE and the target node at the same time. The process of the source UE discovering the Relay UE can be realized through D2D discovery. There are two ways:

The first way: The Relay UE broadcasts its own discovery signal, which carries the information of itself as a Relay node. After receiving the discovery signal, the source UE determines whether to select the Relay UE to forward its own signal.

The second way: the source UE sends a request discovery signal, which contains information about itself and the target node; after receiving the request discovery signal, the surrounding UE determines whether it can be used as the relay UE between the UE and the target node, and if so Then send a response discovery signal; after receiving the response discovery signal, the source UE determines whether to select the Relay UE to forward its own signal.

However, after the introduction of SL relay, for UE-to-UE relay, the source UE, target UE and relay can be moved, so the problem of relay selection and reselection needs to be considered.

The existing UE-to-Network relay selection is that the remote terminal (remote UE) performs relay selection and reselection based on the PC5 interface channel quality between the remote UE and the relay UE. At present, there is no standard solution for UE-to-UE Relay, and the Relay selection and reselection involved are mainly that the source UE (source UE) performs Relay selection and reselection based on the channel quality of the PC5 interface between the source UE and the relay UE, or the source UE The UE or relay UE performs relay selection and reselection based on the PC5 interface channel quality between the source UE and the relay UE and the PC5 interface channel quality between the target UE and the relay UE measured by the relay UE. The obvious disadvantage of this method is that the source UE needs to trigger multiple candidate relay UEs to measure the PC5 port channel quality between it and the target UE, and to exchange the measurement results, which requires the establishment of PC5 between the source UE and multiple candidate relay UEs. The link connection increases the number of PC5 interface connections, and the feedback time will be longer and the efficiency will be lower.

Therefore, the embodiments of the present application provide a method for selecting a relay terminal, a terminal, and a storage medium, so as to solve the problem of low efficiency in selecting or reselection of a relay terminal in the prior art.

The method and the device are conceived based on the same application. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and repeated descriptions will not be repeated here.

The technical solutions provided in the embodiments of the present application can be applied to various systems, especially 5G systems. For example, applicable systems may be global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet Wireless service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, Long term evolution advanced (LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G New Radio (New Radio, NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include a core network part, such as an evolved packet system (Evloved Packet System, EPS), a 5G system (5GS), and the like.

The terminal device involved in the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem. In different systems, the name of the terminal device may be different. For example, in the 5G system, the terminal device may be called user equipment (User Equipment, UE). Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a radio access network (Radio Access Network, RAN). "telephone) and computers with mobile terminal equipment, eg portable, pocket-sized, hand-held, computer-built or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (Personal Digital Assistants), PDA) and other devices. Wireless terminal equipment may also be referred to as system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in the embodiments of the present application. Since the terminal device and other network devices (eg, core network device and access network device (ie, base station)) together form a network that can support communication, in this application, the terminal device is also regarded as a kind of network device.

The network device involved in the embodiments of the present application may be a base station, and the base station may include a plurality of cells providing services for the terminal. Depending on the specific application, the base station may also be called an access point, or may be a device in the access network that communicates with wireless terminal equipment through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, and act as a router between the wireless terminal device and the rest of the access network, which can include the Internet. Protocol (IP) communication network. The network devices may also coordinate attribute management for the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile Communications (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA). ), it can also be a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or it can be an evolved network device in a long term evolution (LTE) system (evolutional Node B, eNB or e-NodeB), 5G base station (gNB) in 5G network architecture (next generation system), or Home evolved Node B (HeNB), relay node (relay node) , a home base station (femto), a pico base station (pico), etc., which are not limited in the embodiments of the present application. In some network structures, a network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be geographically separated.

Furthermore, it is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

The present application will be specifically described below.

As shown in FIG. 1 , it is a flowchart of steps of a method for selecting a relay terminal applied to a first UE in an embodiment of the present application, and the method includes the following steps:

Step 101: When it is determined to select or reselection the relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE.

Specifically, the first UE may be the source UE or the target UE, and the second UE may be the source UE or the target UE; of course, when the first UE is the source UE, the second UE is the target UE; when the first UE is the target UE When , the second UE is the source UE, that is, the embodiments of the present application can be applied to the source UE that performs communication and also to the target UE.

In addition, the communication between the first UE and the second UE is performed through a side link (SL), or the communication between the first UE and the second UE is performed through a source relay UE. Specifically, when the first UE and the second UE communicate through the source relay UE, this communication mode is called UE-to-UE Relay, and the link is a D2D link.

In addition, specifically, when the first UE determines to perform the selection or reselection of the relay UE, that is, when the first UE and the second UE communicate through SL and the first UE determines to perform the selection of the relay UE, or when When the first UE communicates with the second UE through the source relay UE and the first UE determines to perform the reselection of the relay UE, the first UE can measure the first relay candidate result by itself and receive the result sent by the second UE. The second relay candidate result, wherein the second relay candidate result is obtained by the second UE itself.

The second UE sends the second relay candidate result to the first UE through the link in communication with the first UE, and the first UE receives the second relay candidate result sent by the second UE through the link in communication result. It should be noted here that the link over which the first UE and the second UE are communicating is the original communication link before relay reselection is performed. In this way, the first UE receives the second relay candidate result through the original communication link, so that there is no need to additionally establish a PC5 link between the first UE and multiple candidate relays for measurement triggering and measurement result interaction, which improves relay selection. or reselection efficiency.

In addition, the first relay candidate list includes a first relay candidate list satisfying the relay condition and a first channel measurement result list corresponding to the first relay candidate list. The first UE performs discovery and channel measurement on nearby UEs that can provide the relay function, and selects a first relay candidate list that satisfies the relay conditions, that is, the first relay candidate list includes the selected ones by the first UE. In addition, the first channel measurement result list includes channel measurement results between the first UE and each candidate relay in the first relay candidate list. In this way, the channel quality between the first UE and the candidate relay is directly measured by the first UE, so that the measurement result is more suitable for relay selection and reselection.

The second relay candidate list is measured by the second UE and includes a second relay candidate list that satisfies the relay condition and a second channel measurement result list corresponding to the second relay candidate list. The second UE performs discovery and channel measurement on the nearby UEs that can provide the relay function, and selects a second relay candidate list that satisfies the relay conditions, that is, the second relay candidate list includes the selection of the second UE. In addition, the second channel measurement result list includes channel measurement results between the second UE and each candidate relay in the second relay candidate list.

In this way, the first UE obtains its own first relay candidate result and receives the second relay candidate result sent by the second UE, so that the first UE can determine the channel quality between itself and the candidate relay selected by itself. , and can clarify the candidate relay selected by the second UE and the channel quality between the second UE and the candidate relay selected by the second UE, thereby providing conditions for the subsequent selection of the target relay terminal; A UE directly receives the second relay candidate result sent by the second UE, so that no additional connections need to be established between the first UE and the candidate UE and between the candidate UE and the second UE, avoiding the need for selection in the prior art The process of establishing a PC5 link between the first UE and multiple candidate UEs during relay reduces the number of links on the PC5 interface, reduces the feedback time of the second relay candidate result, and improves the relay selection or Efficiency of reselection.

Step 102: According to the first channel measurement result list and the second channel measurement result list, select and obtain the target relay UE from the first relay candidate list and the second relay candidate list.

Specifically, after the first UE obtains its own first relay candidate result and receives the second relay candidate result of the second UE, it can be based on the first channel measurement result list and the second relay candidate result in the first relay candidate result. The second channel measurement result list in the relay candidate results, the target relay UE is selected from the first relay candidate list and the second relay candidate list, due to the channel quality between the first UE and the candidate UE and the second The channel quality between the UE and the relay UE is directly measured by the first UE and the second UE respectively, and the measurement results are also more suitable for relay selection and reselection, thus ensuring the combination of the first relay candidate list and the second relay candidate list. The high quality of the target relay UE selected by the relay candidate list.

In this way, when the first UE in this application determines to select or re-select the relay UE, it obtains its own first relay candidate result and receives the second relay candidate result measured by the second UE itself, and then according to the A list of channel measurement results and a second list of channel measurement results, selected from the first relay candidate list and the second relay candidate list to obtain the target relay UE, considering the channel quality between the first UE and the candidate relay UE and the channel quality between the second UE and the candidate relay UE, and since the channel quality between the first UE and the candidate relay UE and the channel quality between the second UE and the candidate relay UE are determined by the first UE and the candidate relay UE, respectively The second UE directly measures, and the measurement result is more suitable for relay selection and reselection; in addition, the second UE directly sends the second relay candidate result to the first UE, so that there is no need for additional communication between the first UE and the multiple A PC5 link is established between the candidate relay UEs for measurement triggering and measurement result exchange, which improves the efficiency of relay selection and reselection.

It should be noted that, optionally, in this embodiment, the first UE also needs to send the first relay candidate result to the second UE, so as to realize the interaction of the first relay candidate result.

In addition, optionally, in this embodiment, when the first UE determines to perform the selection or reselection of the relay UE, it may include any one of the following methods:

First, when it is determined that the first UE satisfies the preset relay terminal selection trigger condition, it is determined to select or reselection the relay UE.

Specifically, the first UE may determine whether relay selection needs to be performed according to a preset or configured trigger condition for relay terminal selection, and when it is determined that the preset trigger condition for relay terminal selection is satisfied, determine whether to select a relay UE or select a relay terminal. reselection.

Wherein, the relay terminal selection trigger condition includes any one of the following conditions or a combination thereof:

When the first UE and the second UE communicate through the SL, the channel quality or the signal reception strength between the first UE and the second UE is less than the first preset threshold;

When the first UE and the second UE communicate through the SL, the bit error rate or the block error rate between the first UE and the second UE is greater than the second preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the first UE and the source relay UE is less than a third preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the first UE and the source relay UE is greater than a fourth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the second UE and the source relay UE is less than the fifth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the second UE and the source relay UE is greater than a sixth preset threshold;

The indication information sent by the source relay UE is received, where the indication information is used to instruct the first UE and the second UE to select or reselection the relay terminal.

That is, when the first UE determines that it meets any one of the above conditions or a combination thereof, it determines to select or reselection the relay UE.

Second, when receiving the notification message sent by the second UE, it is determined to select or reselection the relay UE.

The notification message is used to notify the second UE that a preset or configured relay terminal selection trigger condition is satisfied.

Specifically, both the first UE and the second UE need to notify the opposite UE when the relay terminal selection trigger condition is reached. That is, when the second UE satisfies the relay terminal selection trigger condition, a notification message is sent to the first UE to notify the second UE that the relay terminal selection trigger condition has been reached, and relay selection or reselection is required.

In addition, the notification message can be transmitted through PC5-S signaling, PC5-RRC signaling, SL MAC CE or physical layer information, which is not specifically limited here.

In this way, whether the first UE itself satisfies the relay terminal triggering condition or the second UE satisfies the relay terminal triggering condition, the selection or reselection of the relay UE is triggered, so that which part of the original communication link has poor channel quality The communication link can be updated at all times, which ensures the communication quality between the first UE and the second UE.

In addition, optionally, in this embodiment, the first UE selects the target relay from the first relay candidate list and the second relay candidate list according to the first channel measurement result list and the second channel measurement result list When the UE is used, any one of the following methods can be included:

First, according to the first channel measurement result list and the second channel measurement result list, and according to a preset or configured relay selection rule, select the target relay UE from the first relay candidate list and the second relay candidate list. .

Specifically, the relay selection rule may be a predefined rule or algorithm. For example, the relay selection rule may be the sum of the quality of the two links that will exist in the first relay candidate list and the second relay candidate list at the same time. The highest candidate UE is used as the target candidate UE, wherein the link quality of the two segments includes the link quality between the candidate UE and the first UE and the link quality between the candidate UE and the second UE; The link quality is weighted and summed, and the candidate UE with the largest weighted summation result is selected as the target relay UE. That is, the relay selection rule is not specifically limited here.

In this way, in combination with the first channel measurement result list and the second channel measurement result list, the target relay UE is selected from the first relay candidate list and the second relay candidate list according to the relay selection rule, which ensures that the target relay UE has High quality, thus ensuring the communication quality of the communication link after reselection and relay.

In addition, it should be noted that, in this embodiment, a decision-making UE and a non-decision-making UE may also be distinguished, and the decision-making UE may be any UE among the first UE and the second UE. At this time, if the first UE is the decision-making UE, the target relay UE may only be selected from the first relay candidate list and the second relay candidate list by the first UE according to the preset relay selection rule; of course, If neither the first UE nor the second UE is a decision-making UE, that is, there is no decision-making UE, both the first UE and the second UE need to select the relay candidate list from the first relay candidate list and the second relay selection rule according to the preset relay selection rule. The target relay UE is obtained by selecting from the candidate list.

Second, according to the first channel measurement result list and the second channel measurement result list, negotiate with the second UE to select the target relay UE from the first relay list and the second relay candidate list.

In this manner, specifically, the first UE may negotiate with the second UE to select the target relay UE from the first relay list and the second relay candidate list.

For example, the first UE and the second UE may negotiate to determine the candidate UE that both exists in the first relay candidate list and the second relay candidate list and has the highest sum of link qualities of the two segments as the target candidate UE, or The candidate UE with the largest result of the weighted summation of the link quality is taken as the target relay UE. The specific algorithm for negotiation is not specifically limited here.

Determining the target relay UE through negotiation ensures the uniqueness of the selected target relay UE, avoiding the need to exchange information to determine the final target relay UE when the target relay UE selected by the first UE and the second UE is inconsistent. the process of.

In this way, the selection process of the target relay UE is realized by any of the above methods.

Optionally, after the first UE obtains the target relay UE, it also needs to send the identification information of the target relay UE to the second UE, so as to realize the exchange of information of the target relay UE, so that the second UE can identify the first UE. Which target relay UE is selected by a UE, thereby enabling connection with the selected target relay UE.

In addition, after the first UE obtains the target relay UE, it can also establish a communication connection with the target relay UE, and release the original communication connection.

Specifically, the first UE and the second UE can respectively establish a PC5 interface connection with the selected target relay UE, and establish an end-to-end control plane and user plane connection through the target relay UE, and communicate through the connection; A UE and a second UE release the original communication connection, wherein the original communication connection is the communication connection before the relay UE selection or reselection is performed.

It should be noted that the first UE and the second UE may release the original communication connection based on signaling, or release the original communication connection based on a timer, or automatically release the previous communication connection after the establishment of the new communication connection. There is no specific restriction on this.

In this way, the embodiment of the present application realizes the selection or reselection of the target relay UE through the above process, and because the channel quality between the first UE and the candidate relay UE and the relationship between the second UE and the candidate relay UE are considered at the same time The channel quality between the first UE and the candidate relay UE and the channel quality between the second UE and the candidate relay UE are directly measured by the first UE and the second UE, respectively, and the measurement results are also more suitable for using It is used for relay selection and reselection; in addition, the direct interaction between the first UE and the second UE, that is, the interaction of the relay candidate results using the link being communicated, does not require additional information between the first UE and the multiple candidates. Following the establishment of a PC5 link between UEs for measurement triggering and measurement result exchange, the efficiency of relay selection and reselection is improved.

The present application will be specifically described below through specific embodiments.

In the first embodiment, it is assumed that the first UE is the source UE, the second UE is the target UE, and the source UE and the target UE communicate directly through the SL, and a relay (Relay) needs to be selected to switch to the UE-to-UE Relay :

The selection process of the target relay UE is shown in Figure 2, and the selection process of the target relay UE includes the following steps:

Step 1, the source UE and the target UE judge whether to perform Relay selection according to the relay terminal selection trigger condition, wherein the relay terminal selection trigger condition can be but not limited to one or a combination of the following conditions:

The channel quality or signal reception strength between the source UE and the target UE is less than the first preset threshold;

The bit error rate or block error rate between the source UE and the target UE is greater than the second preset threshold;

receiving indication information sent by the source relay UE, wherein the indication information is used to instruct the source UE and the target UE to select or reselection the relay terminal;

The above-mentioned relay terminal selection trigger condition can be measured or detected by any UE at both ends of the communication, and the channel quality, bit error rate or block error rate between the source UE and the target UE can be based on one-way link or two-way link. link.

In addition, optionally, when the UE at one end satisfies the trigger condition for relay terminal selection, a notification message may be sent to the UE at the opposite end to indicate relay selection or reselection.

Step 2, the source UE and the target UE respectively measure the nearby UEs that can provide the relay function to perform discovery and channel measurement, and select the candidate relays that meet the relay conditions and the list of corresponding channel qualities, that is, obtain the first relay candidate results respectively. and the second relay candidate result.

Step 3, when the source UE and the target UE distinguish the decision-making UE and the non-decision-making UE, the non-decision-making UE sends its relay candidate result to the decision-making UE; if there is no decision-making UE, both the source UE and the target UE send to the opposite UE. Relay candidate results that meet the relay conditions measured by yourself.

Step 4, the UEs at both ends perform relay selection based on the relay candidate results of the UE and the UE at the opposite end, or both sides negotiate to determine which candidate relay UE is to be selected as the target relay UE. Of course, only the decision-making UE may perform relay selection based on the relay candidate results of its own and the opposite-end UE. If there is no decision-making UE, the two parties negotiate to determine which candidate relay UE to select as the target relay UE. It should be noted that the specific selection algorithm of the target relay UE is not limited here, and the selected target relay UE in this example is UE1.

Step 5, the source UE and the target UE respectively establish a PC5 interface connection with the selected target relay UE (UE1).

Step 6, the source UE and the target UE establish an end-to-end control plane and user plane connection through the target relay UE (UE1), and communicate through the connection.

Step 7, the previous direct communication connection is released between the source UE and the target UE.

In some cases, the source UE and the target UE do not release the direct communication connection through explicit signaling, then the source UE and the target UE may release the direct communication connection based on a timer, or automatically release the previous connection after the new connection is established.

In the second embodiment, it is assumed that the first UE is the source UE, the second UE is the target UE, and the source UE and the target UE communicate through the source relay UE, and perform relay reselection in the case of UE-to-UE relay :

The selection process of the target relay UE is shown in Figure 3, and the selection process of the target relay UE includes the following steps:

Step 1, the source UE and the target UE determine whether to perform relay reselection according to the relay terminal selection trigger condition, wherein the relay terminal selection trigger condition may be but not limited to one or a combination of the following conditions:

The channel quality or signal reception strength between the source UE and the source relay UE is less than a third preset threshold;

The bit error rate or block error rate between the source UE and the source relay UE is greater than a fourth preset threshold;

The channel quality or signal reception strength between the target UE and the source relay UE is less than the fifth preset threshold;

The bit error rate or block error rate between the target UE and the source relay UE is greater than the sixth preset threshold;

Step 4, the UEs at both ends perform relay selection based on the relay candidate results of the UE and the UE at the opposite end, or both sides negotiate to determine which candidate relay UE is to be selected as the target relay UE. Of course, only the decision-making UE may perform relay selection based on the relay candidate results of the UE and the opposite-end UE. If there is no decision-making UE, the two parties negotiate to determine which candidate relay UE to select as the target relay UE. It should be noted that the specific selection algorithm of the target relay UE is not limited here.

Step 5, the source UE and the target UE respectively establish a PC5 interface connection with the selected target relay UE.

Step 6, the source UE and the target UE establish an end-to-end control plane and user plane connection through the target relay UE, and communicate through the connection.

In this way, the relay selection or reselection process is implemented through any of the above embodiments.

FIG. 4 is a schematic structural diagram of a terminal provided by an embodiment of the present application. The terminal is a first UE and communicates with a second UE, and includes a memory 420 , a transceiver 400 , and a processor 410 .

4, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 410 and various circuits of memory represented by memory 420 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides the interface. Transceiver 400 may be multiple elements, including a transmitter and a receiver, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like. The processor 410 is responsible for managing the bus architecture and general processing, and the memory 420 may store data used by the processor 410 in performing operations.

The processor 410 can be a central processor (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device). , CPLD), the processor can also use a multi-core architecture.

The memory 420 is used to store computer programs; the transceiver 400 is used to send and receive data under the control of the processor; the processor 410 is used to read the computer program in the memory and perform the following operations:

When it is determined to perform the selection or reselection of the relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE, wherein the first relay candidate result includes satisfying A first relay candidate list of relay conditions and a first channel measurement result list corresponding to the first relay candidate list, and the second relay candidate result is measured by the second UE and includes a relay that satisfies the a conditional second relay candidate list and a second channel measurement result list corresponding to the second relay candidate list;

Optionally, the determining to perform selection or reselection of the relay UE includes:

When it is determined that the first UE satisfies the preset or configured relay terminal selection trigger condition, it is determined to select or reselection the relay UE; or, when the notification message sent by the second UE is received, it is determined The selection or reselection of a relay UE is performed, wherein the notification message is used to notify the second UE that the preset or configured relay terminal selection trigger condition is satisfied.

Optionally, the relay terminal selection trigger condition includes any one of the following conditions or a combination thereof:

When communicating between the first UE and the second UE through SL, the channel quality or the signal reception strength between the first UE and the second UE is less than a first preset threshold;

When the first UE and the second UE communicate through the SL, the bit error rate or the block error rate between the first UE and the second UE is greater than a second preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the second UE and the source relay UE is less than a fifth preset threshold;

Receive indication information sent by the source relay UE, where the indication information is used to instruct the first UE and the second UE to select or reselection a relay terminal.

Optionally, selecting the target relay UE from the first relay candidate list and the second relay candidate list according to the first relay candidate result and the second relay candidate result, including :

According to the first channel measurement result list and the second channel measurement result list, and according to a preset or configured relay selection rule, select from the first relay candidate list and the second relay candidate list to obtain the target Relay UE; or, according to the first channel measurement result list and the second channel measurement result list, negotiate with the second UE to select from the first relay list and the second relay candidate list to obtain the target relay UE.

Optionally, after the target relay UE is selected from the first relay candidate list and the second relay candidate list, the method further includes:

Send the identification information of the target relay UE to the second UE.

Establish a communication connection with the target relay UE, and release the original communication connection.

Optionally, also include:

The first relay candidate result is sent to the second UE.

Optionally, the first UE is a source UE or a target UE, and the second UE is a source UE or a target UE.

It should be noted here that the above embodiment can implement the method steps of the first UE side method embodiment and can achieve the same technical effect, which will not be described in detail here.

5 is a block diagram of a module of an apparatus for selecting a relay terminal provided by an embodiment of the present application. The apparatus is applied to a first UE that communicates with a second UE, including:

The receiving module 501 is configured to, when it is determined to select or reselection a relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE, wherein the The first relay candidate result includes a first relay candidate list satisfying relay conditions and a first channel measurement result list corresponding to the first relay candidate list, and the second relay candidate result is the second relay candidate result. The UE measures and includes a second relay candidate list that satisfies the relay condition and a second channel measurement result list corresponding to the second relay candidate list;

The determining module 502 is configured to select and obtain a target relay UE from the first relay candidate list and the second relay candidate list according to the first channel measurement result list and the second channel measurement result list.

Optionally, the determining module is specifically used for:

Optionally, the method further includes a first sending module configured to send the identification information of the target relay UE to the second UE.

Optionally, a connection release module is also included, configured to establish a communication connection with the target relay UE and release the original communication connection.

Optionally, a second sending module is further included, configured to send the first relay candidate result to the second UE.

It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and other division methods may be used in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a processor-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

It should be noted here that the above-mentioned device provided by the embodiment of the present application can realize all the method steps realized by the above-mentioned method embodiment, and can achieve the same technical effect, and the same as the method embodiment in this embodiment is not repeated here. The parts and beneficial effects will be described in detail.

On the other hand, an embodiment of the present application further provides a processor-readable storage medium, where a computer program is stored in the processor-readable storage medium, and the computer program is used to cause the processor to execute the processes described in the foregoing embodiments. Methods.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (eg, floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (eg, CD, DVD, BD, HVD, etc.), and semiconductor memory (eg, ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state disk (SSD)), etc.

It can be seen from the foregoing embodiments that the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the foregoing method for selecting a relay terminal.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowcharts and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory result in the manufacture of means comprising the instructions product, the instruction means implements the functions specified in the flow or flow of the flowchart and/or the block or blocks of the block diagram.

These processor-executable instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process that Execution of the instructions provides steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A method for selecting a relay terminal, which is applied to a first UE that communicates with a second terminal UE, wherein the method includes:

When it is determined to perform the selection or reselection of the relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE, wherein the first relay candidate result includes satisfying A first relay candidate list of relay conditions and a first channel measurement result list corresponding to the first relay candidate list, the second relay candidate result is obtained by the second UE measurement and includes the relay a conditional second relay candidate list and a second channel measurement result list corresponding to the second relay candidate list;

According to the first channel measurement result list and the second channel measurement result list, a target relay UE is selected from the first relay candidate list and the second relay candidate list.
The method for selecting a relay terminal according to claim 1, wherein the determining to perform selection or reselection of a relay UE comprises:

When it is determined that the first UE satisfies the preset or configured relay terminal selection trigger condition, it is determined to select or reselection the relay UE; or,

When a notification message sent by the second UE is received, it is determined to select or reselection a relay UE, wherein the notification message is used to notify the second UE that the relay terminal satisfies the preset or configuration Select the trigger condition.
The method for selecting a relay terminal according to claim 2, wherein the relay terminal selection trigger condition comprises any one of the following conditions or a combination thereof:

When communicating between the first UE and the second UE through SL, the channel quality or the signal reception strength between the first UE and the second UE is less than a first preset threshold;

When the first UE and the second UE communicate through the SL, the bit error rate or the block error rate between the first UE and the second UE is greater than a second preset threshold;

When communicating between the first UE and the second UE through the source relay UE, the channel quality or signal reception strength between the first UE and the source relay UE is less than a third preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the first UE and the source relay UE is greater than a fourth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the second UE and the source relay UE is less than a fifth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the second UE and the source relay UE is greater than a sixth preset threshold;

Receive indication information sent by the source relay UE, where the indication information is used to instruct the first UE and the second UE to select or reselection a relay terminal.
The method for selecting a relay terminal according to claim 1, wherein the first channel measurement result list and the second channel measurement result list are selected from the first relay candidate list and the first relay candidate list according to the first channel measurement result list and the second channel measurement result list. Select the target relay UE from the second relay candidate list, including:

According to the first channel measurement result list and the second channel measurement result list, and according to a preset or configured relay selection rule, select from the first relay candidate list and the second relay candidate list to obtain the target Relay UE; or,

According to the first channel measurement result list and the second channel measurement result list, negotiate with the second UE to select the target relay UE from the first relay list and the second relay candidate list.
The method for selecting a relay terminal according to claim 1, wherein after the selecting and obtaining the target relay UE from the first relay candidate list and the second relay candidate list, the method further comprises:

Send the identification information of the target relay UE to the second UE.
The method for selecting a relay terminal according to claim 1, wherein after the selecting and obtaining the target relay UE from the first relay candidate list and the second relay candidate list, the method further comprises:

Establish a communication connection with the target relay UE, and release the original communication connection.
The method for selecting a relay terminal according to claim 1, further comprising:

The first relay candidate result is sent to the second UE.
The method for selecting a relay terminal according to any one of claims 1 to 7, wherein the first UE is a source UE or a target UE, and the second UE is a source UE or a target UE.
A terminal, the terminal is a first terminal UE and communicates with a second UE, characterized in that it includes a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

When it is determined to perform the selection or reselection of the relay UE, the first UE obtains the first relay candidate result by measuring and receives the second relay candidate result sent by the second UE, wherein the first relay candidate result includes satisfying A first relay candidate list of relay conditions and a first channel measurement result list corresponding to the first relay candidate list, the second relay candidate result is obtained by the second UE measurement and includes the relay a conditional second relay candidate list and a second channel measurement result list corresponding to the second relay candidate list;

According to the first channel measurement result list and the second channel measurement result list, a target relay UE is selected from the first relay candidate list and the second relay candidate list.
The terminal according to claim 9, wherein the determining to perform selection or reselection of the relay UE comprises:

When it is determined that the first UE satisfies the preset or configured relay terminal selection trigger condition, it is determined to select or reselection the relay UE; or,

When a notification message sent by the second UE is received, it is determined to select or reselection a relay UE, wherein the notification message is used to notify the second UE that the relay terminal satisfies the preset or configuration Select the trigger condition.
The terminal according to claim 10, wherein the relay terminal selection trigger condition comprises any one of the following conditions or a combination thereof:

When communicating between the first UE and the second UE through SL, the channel quality or the signal reception strength between the first UE and the second UE is less than a first preset threshold;

When the first UE and the second UE communicate through the SL, the bit error rate or the block error rate between the first UE and the second UE is greater than a second preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the first UE and the source relay UE is less than a third preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the first UE and the source relay UE is greater than a fourth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the second UE and the source relay UE is less than a fifth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the second UE and the source relay UE is greater than a sixth preset threshold;

Receive indication information sent by the source relay UE, where the indication information is used to instruct the first UE and the second UE to select or reselection a relay terminal.
The terminal according to claim 9, wherein, according to the first channel measurement result list and the second channel measurement result list, the first relay candidate list and the second relay candidate list are obtained from the first relay candidate list and the second relay candidate list. Select to get the target relay UE, including:

According to the first channel measurement result list and the second channel measurement result list, and according to a preset or configured relay selection rule, select from the first relay candidate list and the second relay candidate list to obtain the target Relay UE; or,

According to the first channel measurement result list and the second channel measurement result list, negotiate with the second UE to select the target relay UE from the first relay list and the second relay candidate list.
The terminal according to claim 9, wherein after the target relay UE is selected from the first relay candidate list and the second relay candidate list, the method further comprises:

Sending the identification information of the target relay UE to the second UE.
The terminal according to claim 9, wherein after the target relay UE is selected from the first relay candidate list and the second relay candidate list, the method further comprises:

Establish a communication connection with the target relay UE, and release the original communication connection.
The terminal according to claim 9, further comprising:

The first relay candidate result is sent to the second UE.
The terminal according to any one of claims 9 to 15, wherein the first UE is a source UE or a target UE, and the second UE is a source UE or a target UE.
An apparatus for selecting a relay terminal, which is applied to a first UE that communicates with a second terminal UE, wherein the apparatus includes:

The receiving module is configured to, when it is determined to select or re-select the relay UE, the first UE obtains the first relay candidate result by measurement and receives the second relay candidate result sent by the second UE, wherein the first middle The relay candidate result includes a first relay candidate list that satisfies the relay condition and a first channel measurement result list corresponding to the first relay candidate list, and the second relay candidate result is obtained by measuring the second UE and includes a second relay candidate list that satisfies the relay condition and a second channel measurement result list corresponding to the second relay candidate list;

A determining module, configured to select and obtain a target relay UE from the first relay candidate list and the second relay candidate list according to the first channel measurement result list and the second channel measurement result list.
The apparatus for selecting a relay terminal according to claim 17, wherein the determining to perform selection or reselection of the relay UE comprises:

When it is determined that the first UE satisfies the preset or configured relay terminal selection trigger condition, it is determined to select or reselection the relay UE; or, when the notification message sent by the second UE is received, it is determined The selection or reselection of a relay UE is performed, wherein the notification message is used to notify the second UE that the preset or configured relay terminal selection trigger condition is satisfied.
The apparatus for selecting a relay terminal according to claim 18, wherein the relay terminal selection trigger condition comprises any one of the following conditions or a combination thereof:

When communicating between the first UE and the second UE through SL, the channel quality or the signal reception strength between the first UE and the second UE is less than a first preset threshold;

When the first UE and the second UE communicate through the SL, the bit error rate or the block error rate between the first UE and the second UE is greater than a second preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the first UE and the source relay UE is less than a third preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the first UE and the source relay UE is greater than a fourth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the channel quality or signal reception strength between the second UE and the source relay UE is less than a fifth preset threshold;

When the first UE and the second UE communicate through the source relay UE, the bit error rate or the block error rate between the second UE and the source relay UE is greater than a sixth preset threshold;

Receive indication information sent by the source relay UE, where the indication information is used to instruct the first UE and the second UE to select or reselection a relay terminal.
The apparatus for selecting a relay terminal according to claim 17, wherein the determining module is specifically configured to:

According to the first channel measurement result list and the second channel measurement result list, and according to a preset or configured relay selection rule, select from the first relay candidate list and the second relay candidate list to obtain the target Relay UE; or, according to the first channel measurement result list and the second channel measurement result list, negotiate with the second UE to select from the first relay list and the second relay candidate list to obtain the target relay UE.
The apparatus for selecting a relay terminal according to claim 17, further comprising:

A first sending module, configured to send the identification information of the target relay UE to the second UE.
The apparatus for selecting a relay terminal according to claim 17, further comprising:

A connection release module is used to establish a communication connection with the target relay UE and release the original communication connection.
The apparatus for selecting a relay terminal according to claim 17, further comprising:

A second sending module, configured to send the first relay candidate result to the second UE.
The apparatus for selecting a relay terminal according to any one of claims 17 to 23, wherein the first UE is a source UE or a target UE, and the second UE is a source UE or a target UE.
A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program, and the computer program is used to cause a processor to execute the method of any one of claims 1 to 8.