CN112399559A

CN112399559A - Feedback resource selection method and terminal

Info

Publication number: CN112399559A
Application number: CN201910745719.0A
Authority: CN
Inventors: 王达; 赵亚利
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2021-02-23
Also published as: WO2021027834A1

Abstract

The embodiment of the invention provides a feedback resource selection method and a terminal, and the method comprises the following steps: a first terminal acquires the identification of each terminal in a terminal group; and the first terminal selects the feedback resource of the direct communication link according to the identification of each terminal. The embodiment of the invention can avoid the selected feedback resource conflict.

Description

Feedback resource selection method and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a feedback resource selection method and a terminal.

Background

In addition to the original broadcast communication mode, a unicast communication mode and a multicast communication mode are newly introduced in the New Radio (NR) vehicle networking (V2X) technology. In addition, some new application scenarios may arise due to NR V2X or V2X of subsequently evolved communication systems, such as: vehicle formation, advanced driving, sensor information sharing, or remote control. Therefore, it is desirable to introduce a feedback mechanism in the V2X technology to control the number of retransmissions at the transmitting end. Since some resources may not need network side scheduling due to the V2X technology, there may be a problem of feedback resource collision in selecting feedback resources.

Disclosure of Invention

The embodiment of the invention provides a feedback resource selection method and a terminal, aiming at solving the problem that feedback resource conflict may exist in the selection of feedback resources.

The embodiment of the invention provides a feedback resource selection method, which comprises the following steps:

a first terminal acquires the identification of each terminal in a terminal group;

and the first terminal selects the feedback resource of the direct communication link according to the identification of each terminal.

Optionally, the first terminal obtains the identifier of each terminal through at least one of an application layer, an Access Stratum (AS) layer, and a physical layer.

Optionally, the first terminal obtains the identifier of each terminal in the terminal group through an AS layer or a physical layer; or

And the first terminal acquires the identifier of each terminal sent by the head terminal of the terminal group or the network side equipment through an AS layer or a physical layer.

Optionally, the method further includes:

the first terminal acquires a first identifier of a second terminal in the terminal group;

the second terminal is a terminal for updating the identifier, and the first identifier is an identifier updated by the second terminal; or

The second terminal is a terminal joining the terminal group; or

The second terminal is a terminal leaving the terminal group.

Optionally, the first terminal obtains the first identifier of the second terminal through at least one of an application layer, an AS layer, and a physical layer.

Optionally, when the sending terminal performing the multicast service in the terminal group sends the multicast information, the sending terminal indicates whether the receiving terminal uses the first identifier to select the feedback resource, where the first terminal is the sending terminal or the receiving terminal.

Optionally, when the second terminal is a terminal that updates the identifier or a terminal that joins the terminal group:

if the sending terminal receives the first identifier, the sending terminal indicates the receiving terminal to use the first identifier to select feedback resources when sending multicast information;

if the receiving terminal receives the first identifier, the receiving terminal uses the first identifier to select feedback resources;

and if the receiving terminal does not receive the first identifier, the receiving terminal does not send feedback information.

Optionally, when the second terminal is a terminal leaving the terminal group:

if the sending terminal receives the first identifier, the sending terminal indicates the receiving terminal not to use the first identifier to select the feedback resource when sending the multicast information;

if the receiving terminal receives the first identifier, the receiving terminal does not use the first identifier to select feedback resources;

Optionally, when the second terminal is a terminal that updates the identifier:

when the sending terminal sends the multicast information, indicating a receiving terminal not to use the first identifier to select the feedback resource, and the receiving terminal uses the identifier of the second terminal before updating to select the feedback resource, or when the sending terminal sends the multicast information, the receiving terminal does not receive the indication of the sending terminal, and the receiving terminal uses the identifier of the second terminal before updating to select the feedback resource; and/or

And under the condition that the second terminal is a terminal joining the terminal group:

when the sending terminal sends the multicast information, the sending terminal indicates a receiving terminal not to use the first identifier to select the feedback resource, and the receiving terminal does not use the first identifier of the second terminal to select the feedback resource, or when the sending terminal sends the multicast information, the receiving terminal does not receive the indication of the sending terminal, and the receiving terminal does not use the first identifier of the second terminal to select the feedback resource; and/or

In the case that the second terminal is a terminal leaving the terminal group:

and when the sending terminal sends the multicast information, indicating a receiving terminal to use the first identifier to select the feedback resource, and the receiving terminal uses the first identifier to select the feedback resource, or when the sending terminal sends the multicast information, the receiving terminal does not receive the indication of the sending terminal, and the receiving terminal uses the first identifier to select the feedback resource.

Optionally, the sending terminal indicates, through 1-bit indication information, whether the receiving terminal uses the first identifier to select the feedback resource; or

And the sending terminal indicates whether the receiving terminal uses the first identifier to select the feedback resource or not through the indication information comprising the first identifier.

Optionally, when the indication information includes the first identifier and indicates a receiving terminal to select a feedback resource using the first identifier, the receiving terminal selects the feedback resource according to the first identifier included in the indication information; or

And under the condition that the indication information comprises the first identifier and indicates a receiving terminal not to use the first identifier to select the feedback resource, the receiving terminal does not use the first identifier included by the indication information to select the feedback resource.

receiving the first identifier sent by a head terminal of the terminal group or network side equipment in a first time, and selecting feedback resources by using the first identifier after the first time is finished;

in the case that the second terminal is a terminal leaving the terminal group:

receiving the first identifier sent by the head terminal of the terminal group or the network side equipment in a second time, and selecting feedback resources without using the first identifier after the second time is finished;

the first time and the second time are preconfigured or configured by the group head terminal or the network side device, and there is or does not exist an overlap between the first time and the second time.

Optionally, if a message sent by a head terminal of the terminal group or a network side device and without a terminal update identifier or join is received within the first time, it is determined that no terminal update identifier or join is present within the first time; and/or if no message sent by the head terminal of the terminal group or the network side equipment is received within the first time, no feedback information is sent after the first time is over;

if a message that no terminal leaves and is sent by a group head terminal of the terminal group or network side equipment is received within the second time, determining that no terminal leaves within the second time; and/or if the group head terminal of the terminal group or the network side equipment does not send any message within the second time, not sending feedback information after the second time is over.

Optionally, when the second terminal is a terminal that updates the identifier:

the first terminal acquires the first identifier sent by the second terminal and a second identifier before updating of the second terminal through an AS layer or a physical layer; or

The first terminal acquires the first identifier sent by a head terminal of the terminal group or network side equipment and a second identifier before updating of the second terminal through an AS layer or a physical layer;

when the second terminal is a terminal joining or leaving the terminal group:

the first terminal acquires the first identifier sent by the second terminal through an AS layer or a physical layer; or

And the first terminal acquires the first identifier sent by the head terminal of the terminal group or the network side equipment through an AS layer or a physical layer.

Optionally, when the second terminal is a terminal joining or leaving the terminal group:

and the first terminal acquires the indication information of the second terminal for joining or leaving the terminal group through an AS layer or a physical layer.

Optionally, when the second terminal is a terminal joining the terminal group:

the second terminal acquires the identifier of each terminal in the terminal group;

in the case that the second terminal is a terminal leaving the terminal group:

and the second terminal leaves the terminal group under the condition that each terminal in the terminal group receives the first identifier.

An embodiment of the present invention further provides a terminal, where the terminal is a first terminal, and the terminal includes:

the first acquisition module is used for acquiring the identifier of each terminal in the terminal group;

and the selection module is used for selecting the feedback resources of the direct communication link according to the identification of each terminal.

Optionally, the terminal further includes:

The second terminal is a terminal joining the terminal group; or

The second terminal is a terminal leaving the terminal group.

in the case that the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

when the second terminal is a terminal joining or leaving the terminal group:

An embodiment of the present invention further provides a terminal, where the terminal is a first terminal, and the terminal includes: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is used for acquiring the identification of each terminal in the terminal group;

the transceiver or the processor is configured to select a feedback resource of the direct communication link according to the identifier of each terminal.

Optionally, the terminal further includes:

The second terminal is a terminal joining the terminal group; or

The second terminal is a terminal leaving the terminal group.

Optionally, when the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

In the case that the second terminal is a terminal leaving the terminal group:

in the case that the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

when the second terminal is a terminal joining or leaving the terminal group:

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps in the feedback resource selection method provided in the embodiment of the present invention.

In the embodiment of the invention, a first terminal acquires the identifier of each terminal in a terminal group; and the first terminal selects the feedback resource of the direct communication link according to the identification of each terminal. Because the feedback resources of the direct communication link are selected according to the identification of each terminal, the selected feedback resource conflict can be avoided.

Drawings

FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present invention are applicable;

fig. 2 is a flowchart of a feedback resource selection method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of identifier acquisition according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of another identifier acquisition provided by an embodiment of the present invention;

fig. 11 is a structural diagram of a terminal according to an embodiment of the present invention;

fig. 12 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 13 is a block diagram of another terminal according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure to which the embodiment of the present invention is applicable, and as shown in fig. 1, the network structure includes a plurality of terminals 11 and a network side device 12, where the terminal 11 may be a User Equipment (UE) or other terminal devices, for example: the present invention relates to a Mobile terminal, and more particularly, to a Mobile terminal, a Mobile. A direct communication link between the terminals 11, which can directly communicate with each other, is called a Sidelink (translated into a direct link or a bypass, also called a direct communication interface or a direct link interface), that is, the terminals can directly communicate with each other through the Sidelink. The terminals of the direct communication can be all on-line or all off-line, or part of the devices are on-line and part of the devices are off-line. The network side device 12 may be a base station, for example: macro station, LTE eNB, 5G NR NB, etc.; the network device may also be a small station, such as a Low Power Node (LPN), pico, femto, or the network device may be an Access Point (AP); the base station may also be a network node formed by a Central Unit (CU) and a plurality of Transmission Reception Points (TRPs) managed and controlled by the CU; or the network Side device 12 may be an Integrated Access Backhaul (IAB), a relay (relay), a Road Side Unit (RSU), or the like. In addition, the cellular communication link between the Network-side Device 12 and the terminal 11 for direct communication is referred to as a Device to Network (D2N) link, or Uu interface. It should be noted that, in the embodiment of the present invention, the specific type of the network-side device is not limited.

It should be noted that, the embodiment of the present invention may be applied to a New Radio to evolution (NR) internet of vehicles (V2X) network, and may also be applied to other networks that use a direct link for communication, which is not limited to the embodiment of the present invention.

Referring to fig. 2, fig. 2 is a flowchart of a feedback resource selection method according to an embodiment of the present invention, as shown in fig. 2, including the following steps:

201. a first terminal acquires the identification of each terminal in a terminal group;

202. and the first terminal selects the feedback resource of the direct communication link according to the identification of each terminal.

The first terminal may be any communication terminal in the terminal group.

The identifier of each terminal may be an identifier of all terminals in the terminal group acquired by the first terminal, and the identifiers of different terminals are different.

It should be noted that the selecting the feedback resource may be selecting an available Hybrid Automatic Repeat Request (HARQ) feedback resource, or selecting a feedback resource for performing HARQ feedback.

In the embodiment of the present invention, the first terminal may select the feedback resource of the direct communication link according to the identifier of each terminal through the above steps, that is, each terminal selects the feedback resource according to the identifier of each terminal, so as to ensure that the selected feedback resources of different terminals are different, and avoid the selected feedback resource conflict. For example: each terminal selects resources in a particular order of the terminal's identity, for example: and selecting the feedback resources according to the size sequence of the identifiers.

Assume there are 3 UEs in the group (UE1, UE2, UE 3); feedback resource 1, feedback resource 2, feedback resource 3, all UE in the group know the ID of other UE, thus according to UE ID choose feedback resource; for example, the feedback resources are selected according to the size order of the UE IDs, if the UE1ID is larger than the UE2 ID and larger than the UE3 ID, the UE1 selects the feedback resource 1, the UE2 selects the feedback resource 2, and the UE3 selects the feedback resource 3, where the specific feedback resource selection method is not limited.

AS an optional implementation manner, the first terminal obtains the identifier of each terminal through at least one of an application layer, an AS layer, and a physical layer.

In one implementation, group management is performed at an application layer, the application layer of the first terminal may obtain identifiers of other terminals in the group, and may also notify the AS layer and/or the physical layer of the first terminal of the identifiers of the other terminals in the group, so that the terminal may use the identifiers of the terminals in the group to perform feedback resource selection.

In another implementation manner, the first terminal obtains the identifier of each terminal in the terminal group through an AS layer or a physical layer.

The above-mentioned obtaining the identifier of each terminal in the terminal group through the AS layer or the physical layer may be that the terminals in the terminal group send the identifier of the terminal to each other.

For example: the terminal can send the identifier of the terminal by using a multicast message or respectively send the identifier of each terminal by using a unicast message; or, the identifier of the terminal is sent by sending the multicast message, wherein, besides the identifier of the terminal, the identifier of the terminal can also comprise a group identifier, so that the receiving terminal can identify whether the terminal belongs to the same group;

further, when the unicast message is used for sending, the unicast connection between the terminals can be established first, and the group identifier can be used to find the terminals in the terminal group, so as to establish the unicast connection and interact the identifier of the terminal. For example, a first terminal sends a unicast connection establishment request message in a broadcast manner, where the unicast connection establishment request message carries an identifier of the terminal and a group identifier, and a second terminal, through group identifier, identifies a unicast connection establishment request initiated by a terminal in the same group, replies to the message, confirms establishment of a unicast connection, and carries, in a reply message, an identifier of the first terminal and an identifier of the second terminal.

When the terminal transmits the identifier, the identifier of the terminal may be transmitted using Radio Resource Control (RRC) signaling, a Medium access Control-Control element (MAC CE), or a MAC packet.

In another implementation manner, the first terminal obtains, through an AS layer or a physical layer, the identifier of each terminal sent by a head terminal of the terminal group or a network side device.

The group head terminal may be referred to as a cluster head terminal.

For example: the group head terminal or the network side equipment (such as a base station, an RSU or a roadside unit) respectively acquires the identification of each terminal in the group, or the group head terminal or the network side equipment respectively sends the identification to the group head terminal or the network side equipment, and the group head terminal or the network side equipment sends the identification to other terminals in the group. Further, the terminal may send its identifier to the head-of-group terminal using a unicast message, or to the network side device, and the head-of-group terminal, or the network side device may send the identifiers of all terminals in the terminal group to the terminals in the group using a multicast or broadcast manner, or may send the identifiers of all terminals in the group to each terminal in the terminal group using a unicast manner, respectively. And when the head of group terminal or the network side device sends the identifier of the terminal, the identifier of all terminals can be sent by using RRC signaling, MAC CE or MAC packet.

In addition, the message for sending the terminal identifier may carry the group identifier of the terminal group, so that the receiving terminal can identify whether the terminal belongs to the same group.

As an optional implementation, the method further comprises:

The second terminal is a terminal joining the terminal group; or

The second terminal is a terminal leaving the terminal group.

The first terminal may obtain the first identifier of the second terminal through at least one of an application layer, an AS layer, and a physical layer.

In this embodiment, since the identifier of the terminal is supported to be updated, information leakage transmitted in the terminal group due to tracking by other devices other than the terminal group can be prevented. The update of the terminal identifier may be an irregular update, and the terminal may update its identifier autonomously, which is not limited to this, for example: or may be periodically updated. In addition, after the terminal updates the identification, other terminals in the group are informed of the updated identification.

In addition, in this embodiment, if a new terminal joins, each terminal in the terminal group needs to know the identifier of the newly joined terminal to avoid the selected feedback resource conflict, and the newly joined terminal can also obtain the identifier of the terminal in the group.

In addition, in this embodiment, if there is a terminal leaving the group, it can be realized that other terminals can know the identifier of the terminal leaving, so that the identifier of the terminal is not used when selecting the feedback resource. So as to avoid some resources from being selected, which leads to resource waste.

The following description is made with respect to the terminal that updates the identifier, the terminal that joins the terminal group, and the terminal that leaves the terminal group, respectively:

the first terminal and the second terminal are terminals for updating the identification:

the updated identifier may be used for performing group management at an application layer, and the application layer of the first terminal may obtain the updated identifier of the other terminals in the group and notify the AS layer and/or the physical layer of the terminal of the updated identifier of the other terminals in the group, so that the terminal may use the updated identifier of the terminal in the group to perform feedback resource selection. Or the updated identities of the other terminals in the group may be obtained by the AS layer or the physical layer.

Optionally, the first terminal obtains, through an AS layer or a physical layer, the first identifier sent by the second terminal and a second identifier before update of the second terminal.

For example: the second terminal sends the identifier before updating (old identifier) and the identifier after updating (new identifier) to other terminals in the group, so that the other terminals in the group update the identifier of the second terminal; the identifier before updating is sent, so that other terminals in the group can be informed to determine which terminal updates the identifier, and errors are avoided.

Further, the second terminal may send the identifier before the update and the identifier after the update to other terminals in the group in a multicast manner, or send the identifier before the update and the identifier after the update to other terminals in the group in a unicast manner, respectively. Similarly, the identifier before update and the identifier after update may be sent by using RRC signaling, MAC CE, or MAC packet, and the sending message may or may not include the group identifier, because other terminals may determine that the second terminal belongs to the same group according to the identifier before update of the second terminal.

Optionally, the first terminal obtains, through an AS layer or a physical layer, the first identifier sent by a head terminal of the terminal group or a network side device and the second identifier before updating of the second terminal.

The second terminal may send the identifier before updating and the identifier after updating to the group head terminal or the network side device, so that the group head terminal or the network side device updates the identifier of the terminal. Of course, the identifier of the second terminal may also be directly updated by the group head terminal or the network side device, and the second terminal does not need to update itself.

And then, the group head terminal or the network side equipment sends the pre-update identification and the updated identification of the second terminal to the terminals in the group. The group head terminal or the network side device may send the identifier before update and the identifier after update of the second terminal to the terminals in the group in a multicast manner, or send the identifier before update and the identifier after update of the second terminal to the terminals in the group in a unicast manner, respectively. Similarly, when the group head terminal or the network side device sends the identifier, the identifier before update and the identifier after update of the second terminal may be sent using RRC signaling, MAC CE, or MAC packet. And the sending message may or may not contain the group identifier, because other terminals may determine that the second terminal is a terminal belonging to the same group according to the pre-update identifier of the second terminal.

In addition, when the first identifier of the second terminal starts to be used, each terminal in the terminal group can use the first identifier of the second terminal to select the feedback resource under a unified condition or at a unified time, so as to avoid the problem of feedback resource conflict caused by different terminals receiving the updated first identifier at different times. For example: the time for the application layer to obtain the first identifier is different, or the time for the application layer to notify the AS layer and/or the physical layer is different, or the time for the AS layer and/or the physical layer to successfully receive the first identifier is different, and the like. Therefore, the problem of feedback resource conflict caused by the fact that some terminals use the updated first identification and some terminals still use the updated second identification is solved.

The sending terminal may be a sending terminal that performs a multicast service.

In this embodiment, if a terminal in the group updates the identifier and the sending terminal successfully receives the updated identifier, the sending terminal may carry indication information when sending the multicast information, so as to indicate whether the receiving terminal uses the updated identifier to select the feedback resource. The timing of using the updated identifier may be determined according to the specific behavior of the sending terminal, which is not limited to this, for example: when to transmit the indication information after the transmitting terminal successfully received the updated identification depends on the implementation of the transmitting terminal.

In this embodiment, since the sending terminal gives the unified instruction, the problem of the selection resource conflict can be avoided.

In one implementation, if the sending terminal receives the first identifier, the sending terminal instructs the receiving terminal to select the feedback resource by using the first identifier when sending the multicast information;

In the implementation mode, if the receiving terminal has successfully received the updated identifier, the receiving terminal uses the updated identifier to select the feedback resource and sends the feedback information; if the receiving terminal does not successfully receive the updated identifier, the receiving terminal does not send feedback information, which may be waiting to receive retransmission information of the sending terminal, and if the updated identifier is subsequently successfully received, the retransmission information is fed back.

In this implementation, a conflict of selecting feedback resources may be avoided.

In another implementation manner, when the sending terminal sends multicast information, the sending terminal instructs a receiving terminal not to use the first identifier to select a feedback resource, and the receiving terminal uses an identifier of the second terminal before updating to select the feedback resource, or when the sending terminal sends multicast information, the receiving terminal does not receive an instruction of the sending terminal, and the receiving terminal uses an identifier of the second terminal before updating to select the feedback resource.

In the embodiment, if the sending terminal indicates that the receiving terminal does not use the identifier selection feedback resource after updating or does not send the indication, even if the receiving terminal receives the identifier after updating, the receiving terminal still uses the identifier selection feedback resource before updating to avoid the conflict of the selection feedback resource.

The sending terminal may carry the indication information through direct link control information (SCI) of multicast information or MAC CE.

In this embodiment, whether to use the updated first identifier for feedback resource selection is indicated by the 1bit, so that overhead can be saved.

The above indicating whether the receiving terminal uses the first identifier to select the feedback resource by using the indication information including the first identifier may be that, when the receiving terminal includes the first identifier, the receiving terminal is indicated to use the first identifier to select the feedback resource. This may be achieved by including a first identity to instruct the receiving terminal to determine which updated identity to use for selecting the feedback resource.

Further, in a case that the indication information includes the first identifier and indicates a receiving terminal to select a feedback resource using the first identifier, the receiving terminal may select a feedback resource according to the first identifier included in the indication information; or

In a case where the indication information includes the first identifier and indicates that a receiving terminal does not use the first identifier to select a feedback resource, the receiving terminal may not use the first identifier included in the indication information to select a feedback resource.

Thus, even if the receiving terminal does not receive the first identifier of the second terminal (where the first identifier is not obtained by the above-described first identifier obtaining manner for obtaining the second terminal, for example, the first identifier of the second terminal is not obtained by at least one of an application layer, an AS layer and a physical layer, or it is understood that the receiving terminal does not receive the first identifier in addition to the indication information), it is possible to select the feedback resource according to the first identifier included in the indication information of the sending terminal, and send the feedback information. For example: and if the receiving terminal does not receive the first identifier but the sending terminal indicates the first identifier, the receiving terminal uses the first identifier to select feedback resources. Further, in this case, the indication information further needs to include an identifier of the second terminal before updating, so that the receiving terminal determines which terminal is the terminal whose identifier is updated.

In addition, more than 1 terminal in the group may update its identifier, and the sending terminal may use the indication information to distinguish, specifically which updated identifier is used to select resources during the current feedback, which will not cause confusion, and also enables the receiving terminal that has not successfully received the first identifier to select feedback resources according to the first identifier included in the indication information, and send the feedback information.

Optionally, the first identifier sent by the head terminal of the terminal group or the network side device is received within a first time, and after the first time is over, the first identifier is used to select a feedback resource;

wherein the first time is preconfigured, or configured by the group head terminal or the network side device.

Here, the first time may also be referred to as an identifier update time. And the first time may be a periodic or aperiodic time period.

In this embodiment, the first identifier may be received within the first time, and the feedback resource may be selected using the first identifier after the first time is over. This may avoid increased information to indicate when to use the first identity to save transmission overhead.

For example: the group head terminal or the network side device configures or pre-configures the update time of the terminal identifier in the group, that is, the data is not allowed to be sent in the period of time, and only the terminal identifier is allowed to be updated, wherein the terminal can update the identifier of the terminal at any time and can send the updated identifier to the group head terminal or the network side device, but the group head terminal or the network side device can only send the updated identifier to other terminals in the period of time. And selecting the feedback resource by using the new identification at the end of the time period. Thus, in the time period, the head-of-group terminal or the network side device sends the updated UE ID, and the receiving terminal can be ensured to receive correctly.

Optionally, if a message that no terminal update identifier is sent by a head terminal of the terminal group or a network side device is received within the first time, it is determined that no terminal update identifier is present within the first time; and/or if no message sent by the head terminal of the terminal group or the network side equipment is received within the first time, no feedback information is sent after the first time is over;

in this embodiment, a message without a terminal update identifier may be sent to avoid a situation that a terminal waits for a long time without sending feedback information, and in addition, if a terminal that does not receive any message does not send feedback information after the first time is over, therefore, at this time, a head-of-group terminal or a network-side device may send feedback information, but some terminals do not successfully receive the feedback information, so that the terminal does not send feedback information after the first time is over, so as to avoid collision of selected feedback resources.

For example: and if the identifier of the terminal is not updated in the first time, the group head terminal or the network side equipment sends a message without the identifier of the terminal being updated, and the message is used for the receiving terminal to confirm that the identifier is not updated in the time period. If any terminal which correctly receives the message sent by the head group terminal or the network side device does not receive the message in the time period, the feedback cannot be performed after the time period is over, that is, the head group terminal or the network side device sends the message, but the terminal does not correctly receive the message, the terminal needs to wait for the next first time and then receives the message sent by the head group terminal or the network side device.

Second, the second terminal is the terminal joining the terminal group

Likewise, the identities of the terminals joining the terminal group may be used for group management at the application layer, for example: the application layer of the terminal joining the terminal group can obtain the identifiers of other terminals in the group, and the application layers of the other terminals in the group can obtain the identifiers of the terminals joining the terminal group and inform the identifiers of the AS layer and/or the physical layer of the terminals, so that the terminals can use the identifiers of the terminals in the group to perform feedback resource selection. Or the identifier of the terminal joining the terminal group can be obtained through an AS layer or a physical layer.

Optionally, the first terminal obtains the first identifier sent by the second terminal through an AS layer or a physical layer.

Optionally, the first terminal may obtain, through an AS layer or a physical layer, indication information that the second terminal is a terminal group joining terminal.

Further, the second terminal may obtain an identifier of each terminal in the terminal group; among them, the AS layer or the physical layer may be, for example: and acquiring the identifier of each terminal in the terminal group, which is sent by a terminal, or is sent by a group head terminal of the terminal group or network side equipment through an AS layer or a physical layer.

For example: the newly joined terminal sends its identifier to other terminals in the group, or the group head terminal may assign identifiers to the joined terminals. Further, the terminal may notify the terminal of the new join (for example, 1bit may be used to indicate whether the UE is a leaving UE or a newly joining UE, or the terminal may not notify whether the terminal belongs to a terminal in the group by identification).

In addition, other terminals in the group may also send the identifier to the newly added terminal, or the group header or the network side device sends the identifier of the other terminal to the newly added terminal.

Further, the newly joined terminal may send the identification of the terminal using a multicast message, or send its identification to each terminal separately using a unicast message. For example, the newly added terminal sends its identifier to other terminals in the group in a multicast manner, and after receiving the identifier of the newly added terminal, the other terminals in the group can establish unicast connection with the newly added terminal, so as to send its identifier to the newly added terminal, wherein the identifier of the terminal can be interacted already when the unicast connection is established, and then no unicast message interaction is required.

In addition, the multicast message may include a group identifier in addition to the identifier of the terminal, so that the receiving terminal can identify whether the terminals belong to the same group. Also, the pre-update identity and the updated identity may be transmitted using RRC signaling, MAC CE, or MAC packet.

Further, the second terminal has successfully received the identifiers of other terminals in all the groups, selects the feedback resource by using the identifiers of the terminals in the groups, and sends the feedback information, otherwise, does not send the feedback information. Optionally, the second terminal needs to obtain the number of terminals in the group, so as to determine whether the identities of all other terminals in the group have been successfully received.

Optionally, the first terminal obtains the first identifier sent by the head terminal of the terminal group or the network side device through an AS layer or a physical layer.

For example: the newly added terminal sends the identifier to the group head terminal or the network side device, and the newly added terminal can send the identifier to the group head terminal or the network side device in a unicast mode. Of course, it may also be that the group head terminal or the network side device allocates an identifier to the joined terminal.

Further, the terminal may be notified of a newly added terminal (for example, 1bit is used to indicate whether the terminal is a terminal-leaving identifier or a terminal-newly added identifier), or the terminal may not be notified of whether the terminal identifier belongs to the UE in the group.

And then, the group head terminal or the network side equipment sends the identification of the added terminal to the terminals in the group. The group head terminal or the network side device may send the identifier of the joined terminal to the terminals in the group in a multicast manner, or send the identifier of the joined terminal to the terminals in the group in a unicast manner, respectively. Similarly, when the group head terminal or the network side device sends the identifier, the identifier of the joined terminal may be sent by using RRC signaling, MAC CE, or MAC packet. And the sending message may or may not contain the group identifier, because other terminals may determine that the terminal belongs to the same group according to the identifier of the joined terminal.

In addition, when the first identifier of the second terminal starts to be used, each terminal in the terminal group can use the first identifier of the second terminal to select the feedback resource under a unified condition or at a unified time, so as to avoid the problem of feedback resource conflict caused by different terminals receiving the identifiers of the joined terminals at different times.

Optionally, if the sending terminal receives the first identifier, the sending terminal instructs the receiving terminal to select the feedback resource by using the first identifier when sending the multicast information;

Optionally, when the sending terminal sends the multicast information, the sending terminal instructs the receiving terminal not to use the first identifier to select the feedback resource, and the receiving terminal does not use the first identifier of the second terminal to select the feedback resource, or, when the sending terminal sends the multicast information, the receiving terminal does not receive the instruction of the sending terminal, and the receiving terminal does not use the first identifier of the second terminal to select the feedback resource.

For the above indication that the receiving terminal uses the first identifier of the second terminal to select the feedback resource, reference may be made to the corresponding description of the second terminal as the identifier updating terminal, which is not described herein again.

For example: the sending terminal may carry the indication information in the SCI or MAC CE that sends the multicast information, where the indication information may be 1bit, and indicates whether to use the identifier of the newly added terminal to perform feedback resource selection; or the indication information contains the identification of the newly joined terminal, which is used for the receiving terminal to determine which identification of the newly joined terminal is used for selecting the feedback resource.

Further, in a case that the indication information includes the first identifier and indicates a receiving terminal to select a feedback resource using the first identifier, the receiving terminal selects the feedback resource according to the first identifier included in the indication information; or

Thus, even if the receiving terminal does not receive the first identifier of the second terminal (where the first identifier is not obtained by the above-described first identifier obtaining manner for obtaining the second terminal, for example, the first identifier of the second terminal is not obtained by at least one of an application layer, an AS layer and a physical layer, or it is understood that the receiving terminal does not receive the first identifier in addition to the above-described indication information), it is possible to select the feedback resource and send the feedback information according to the first identifier included in the indication information of the sending terminal, or not use the first identifier included in the indication information.

In addition, there may be more than 1 newly added terminal in the group, and the sending terminal may use the indication information to distinguish, specifically, which identifier of the newly added terminal is used to select the resource during the current feedback, which will not cause confusion, and also enables the receiving terminal that has not successfully received the first identifier to select the feedback resource according to the first identifier included in the indication information, and send the feedback information. In addition, the SC or MAC CE of the multicast information may also carry information about the number of terminals in the group, so that after the terminal in the group determines a new joining terminal, the number of terminals in the group, especially for the new joining terminal, may determine whether the identifiers of all other terminals in the group have been successfully received through the number of terminals in the group.

Optionally, the first identifier sent by the head terminal of the terminal group or the network side device is received within a first time, and after the first time is over, the first identifier is used to select a feedback resource.

The first time may also be referred to as a joining terminal identifier transmission time. And the first time may be a periodic or aperiodic time period.

For example: the group head terminal or the network side device configures or pre-configures the time for allowing the terminal to join in the group, i.e. the data is not allowed to be sent in the period of time, only the terminal is allowed to join in the group, and the terminal can only join in the group in the period of time. In this way, the identity of the newly joined terminal is used at the end of the time period. In the time period, the group head terminal or the network side equipment sends the newly added terminal identification to ensure that the receiving terminal can correctly receive the terminal identification. Further, there may be 1bit for each identity in the information to distinguish whether a joining terminal or a leaving terminal.

Optionally, if a message that no terminal joins is received from the head terminal of the terminal group or the network side device within the first time, it is determined that no terminal joins within the first time; and/or if no message sent by the head terminal of the terminal group or the network side equipment is received within the first time, not sending feedback information after the first time is over.

In this embodiment, a situation that the terminal does not send feedback information after waiting for a long time can be avoided by sending a message that no terminal joins, and in addition, if no message is received, no feedback information is sent after the first time is over, so that at this time, it may be that a head-of-group terminal or a network side device has sent but some terminals have not successfully received, and thus, after the first time is over, no feedback information is sent, so as to avoid collision of selected feedback resources.

For example: if no terminal joins in the time period, the group head terminal or the network side equipment sends a message that no terminal joins, and the message is used for the receiving terminal to confirm that no terminal joins in the time period. If any terminal which receives the message sent by the group head terminal or the network side device correctly in the time period cannot feed back after the time period is over, that is, the group head or the base station sends the message, but the terminal does not receive the message correctly, the terminal needs to wait for the next time allowed to join the terminal and then receives the message of the group head terminal or the network side device.

Thirdly, the second terminal is a terminal leaving the terminal group:

similarly, the identifier of the terminal leaving the terminal group may be managed by the application layer, and the application layer of the terminal may obtain the information that the terminal leaves the group, obtain the identifier of the terminal leaving the group, and notify the identifier of the terminal to the AS layer and/or the physical layer of the terminal, so that the terminal may not use the identifier of the terminal leaving the group when selecting the feedback resource. Or the identifier of the terminal leaving the terminal group can be obtained through an AS layer or a physical layer.

Optionally, the first terminal obtains the first identifier sent by the second terminal through an AS layer or a physical layer; or

Further, the first terminal may obtain, through an AS layer or a physical layer, indication information that the second terminal leaves the terminal group.

Further, the second terminal may leave the terminal group when each terminal in the terminal group receives the first identifier.

For example: the leaving terminal sends the identifier to other terminals in the group, and may notify the terminal to leave (for example, 1bit is used to indicate whether the terminal leaves the identifier or newly joins the identifier of the terminal, or may not notify that the terminal judges whether the identifier of the terminal belongs to the terminal in the group);

the terminal leaving may be a terminal that leaves after determining that the other terminals in the group have correctly received the message, otherwise the message needs to be repeatedly sent.

The terminal which leaves can send the terminal identification by using multicast message, or send the terminal identification to each terminal by using unicast message; when the identifier of the terminal is transmitted, the identifier of the terminal may be transmitted using RRC signaling, MAC CE, or MAC packet; in addition, the sending message may or may not include the group identifier, because the receiving terminal may determine that the terminal belongs to the same group according to the identifier of the terminal.

Another example is: the terminal to be left sends the identifier to the head-of-group terminal or the network side equipment, the terminal to be left can send the identifier to the head-of-group terminal or the network side equipment in a unicast mode, and the head-of-group terminal or the network side equipment is determined to correctly receive the identifier, so that the terminal leaves the group;

the terminal to be left may also be notified (for example, 1bit is used to indicate whether the terminal is left or newly added), or the terminal at the head of the group or the network side device may not be notified to determine whether the terminal belongs to the group according to the identifier of the terminal;

the group head terminal or the network side device sends the identifier of the leaving terminal to other terminals in the group, and may send the identifier of the leaving terminal to all terminals in the group in a multicast manner, or respectively send the identifier of the leaving terminal to the terminals in the group in a unicast manner. And the identity of the away terminal may be transmitted using RRC signaling, MAC CE, or MAC packet. Further, the sending message may or may not include a group identifier, because the receiving terminal may determine that the terminal belongs to the same group according to the identifier of the terminal.

Optionally, if the sending terminal receives the first identifier, the sending terminal indicates, when sending multicast information, that the receiving terminal does not use the first identifier to select a feedback resource;

Optionally, when the sending terminal sends the multicast information, the sending terminal instructs the receiving terminal to select the feedback resource by using the first identifier, and the receiving terminal selects the feedback resource by using the first identifier, or, when the sending terminal sends the multicast information, the receiving terminal does not receive the instruction of the sending terminal, and the receiving terminal uses the first identifier to select the feedback resource.

For example: if a terminal leaves from the group and the sending terminal successfully receives the identifier of the leaving terminal, the sending terminal can carry indication information when sending multicast information, and the indication information is used for indicating that the receiving terminal does not use the identifier of the leaving terminal to select feedback resources. The specific time when the indication is used or not used is not limited, and is determined by the sending terminal, for example, when the indication information is sent after the sending terminal successfully receives the identifier of the leaving terminal, depending on the implementation of the sending terminal.

If the receiving terminal has successfully received the identifier of the leaving terminal, the receiving terminal does not use the identifier of the leaving terminal to select a feedback resource and sends feedback information;

if the receiving terminal does not successfully receive the identifier of the leaving terminal, the receiving terminal does not send feedback information, which can be retransmission information of the waiting receiving sending terminal, and if the identifier of the leaving terminal is subsequently successfully received, the retransmission information is fed back;

if the sending terminal indicates that the receiving terminal still uses the identifier of the terminal to select the feedback resource, even if the receiving terminal receives the identifier of the terminal, the receiving terminal still uses the identifier of the terminal to select the feedback resource; or, when the sending terminal sends the multicast information, the receiving terminal does not receive the indication of the sending terminal, and the receiving terminal still uses the first identifier to select the feedback resource.

For example: the sending terminal can carry the indication information in SCI or MAC CE which sends the multicast information, the indication information can be 1bit, and the sending terminal indicates that the feedback resource selection is not carried out by using the mark which leaves the terminal; or the indication information contains an identification of the departing terminal for the receiving terminal to determine which departing terminal is.

Therefore, even if the receiving terminal does not receive the identifier of the departing terminal (here, the first identifier may not be obtained by the above-described first identifier obtaining method for obtaining the second terminal, for example, the first identifier of the second terminal is not obtained by at least one of an application layer, an AS layer and a physical layer, or it is understood that the receiving terminal does not receive the first identifier in addition to the indication information), the feedback resource can be selected without using the identifier of the departing terminal according to the identifier of the departing terminal included in the indication information of the sending terminal, so that the feedback information can be sent.

In addition, there may be more than 1 terminal leaving in the group, and the sending terminal may use the indication information to distinguish, specifically, it does not use which identifier of the leaving terminal to select the resource during the current feedback, so as not to cause confusion, and also the receiving terminal that has not successfully received the identifier of the leaving terminal may determine not to use the identifier of the leaving terminal to select the feedback resource according to the identifier of the leaving terminal included in the indication information, thereby sending the feedback information.

Optionally, the first identifier sent by the head terminal of the terminal group or the network side device is received within a second time, and after the second time is over, the first identifier is not used to select the feedback resource;

the second time is preconfigured, or configured by the group head terminal or the network side device.

It should be noted that the first time and the second time in the above embodiment may or may not overlap. And the overlap may be partial or full.

In this embodiment, the first identifier may be received within the second time, and the feedback resource may be selected without using the first identifier after the second time is finished. This may avoid increased information to indicate when to use the first identity to save transmission overhead.

For example: the group head terminal or the network side device configures or pre-configures the time allowed to join or leave the terminal in the group (for example, a periodic time period, the time allowed to join the terminal and the time allowed to leave the terminal may be overlapped, partially overlapped, or completely independent two time periods), that is, data is not allowed to be sent in the period of time, only terminals are allowed to join or leave (it should be noted that, terminals can only join a group or leave a group in the period of time), the feedback resource is selected by using the identification of the newly joined terminal or not using the identification of the leaving terminal at the end of the period of time, in this time period, the group head terminal or the network side device sends the identifier of the newly joined or left terminal (in this information, optionally, 1bit may be provided for each identifier to distinguish whether the terminal is a joined terminal or a left terminal, and it is ensured that the receiving terminal can correctly receive the information).

Optionally, if a message that no terminal leaves and is sent by a head terminal of the terminal group or a network side device is received within the second time, it is determined that no terminal leaves within the second time; and/or if the group head terminal of the terminal group or the network side equipment does not send any message within the second time, not sending feedback information after the second time is over.

In this embodiment, a situation that the terminal waits for a long time without sending the feedback information may be avoided by sending a message that no terminal leaves, and in addition, if no message is received, no feedback information is sent after the second time is over, so that at this time, a head-of-group terminal or a network-side device may have sent but some terminals have not successfully received, and thus, after the second time is over, no feedback information is sent, so as to avoid collision of the selected feedback resources.

For example: and if no terminal joins or leaves in the time period, the group head terminal or the network side equipment sends a message that no terminal joins or leaves, and the message is used for the receiving terminal to confirm that no terminal joins or leaves in the time period. If the terminal does not correctly receive the message sent by any group head terminal or network side equipment within the time period, the terminal cannot feed back the message after the time period is over, that is, if the group head terminal or network side equipment sends the message, but the terminal does not correctly receive the message, the terminal needs to wait for the next time allowed to join or leave the terminal, and then receives the message of the group head or the base station.

In the following, the feedback resource selection method provided by the embodiment of the present invention is exemplified by using a direct link of NR, a terminal AS UE, and a network side device AS a base station, and acquiring an identifier of the terminal through an AS layer or a physical layer:

example 1:

this embodiment mainly describes how to determine the intra-group UE ID:

one implementation is described with reference to fig. 3:

UE1 sends UE1ID to UE2 and UE 3; UE2 sends UE2 ID to UE2 and UE 3; UE3 sends UE3 ID to UE1 and UE 2;

the UE1 may send UE1ID to UE2 and UE3 using multicast message and receive UE2, UE3 feedback for the multicast message, and stop sending until both UE2 and UE3 can receive correctly; or the UE1 sends UE1ID, receives UE2 and UE3 feedback on the unicast information to UE2 and UE3 respectively by using unicast messages, and stops sending until UE2 and UE3 can both receive correctly;

UE2 and UE3 sending IDs may send their IDs in a manner similar to UE1

When the UE sends the UE ID, the UE ID may be sent using RRC signaling, MAC CE, or MAC packet;

in the multicast sending message, besides the UE ID, the multicast sending message also can contain a group ID so as to facilitate the receiving UE to identify whether the UE belongs to the same group;

when the unicast message is used for sending, unicast connection needs to be established between 2 pieces of UE, and the UE in the group can be found by using the group ID, so that the unicast connection is established and the UE ID is interacted (the UE ID is interacted when the unicast connection is established, and then the unicast message is not required to be sent for interaction); for example, the UE1 sends a unicast connection establishment request message in a broadcast manner, carrying the ID and group ID of the UE 1;

the receiving UE2, recognizing that the request is a unicast connection establishment request initiated by a UE in the same group by the group ID, replies to the message to confirm establishment of the unicast connection, and carries the ID of the sending UE1 and the ID of the receiving UE2 in the reply message.

One implementation is described with reference to fig. 4:

UE1, UE2, UE3 send their IDs to group head (or cluster head) UEs, or base stations, respectively;

the group head UE or the base station sends the IDs of the UE1, the UE2 and the UE3 to other UEs in the group;

the UE1 sends the ID of the UE1 to the head group UE in a unicast mode, receives the feedback of the head group UE on the unicast information, and stops sending the information until the head group UE receives the unicast information correctly; or the UE1 sends the ID of the UE1 to the base station and stops sending until the base station is determined to receive correctly.

UE2 and UE3 sending IDs may send their IDs in a manner similar to UE 1;

the group head UE or the base station may send the IDs of UE1, UE2 and UE3 to UE1 in a multicast mode, and UE2 and UE3 receive the feedback of UE1, UE2 and UE3 to the multicast information, and stop sending until UE1, UE2 and UE3 can all receive correctly.

The head-of-group UE or the base station may also send the IDs of UE1, UE2 and UE3 to UE1, UE2 and UE3 in a unicast manner, and receive the feedback of UE1, UE2 and UE3 on the unicast information, and stop sending until UE1, UE2 and UE3 can both receive correctly.

When the group head or the base station transmits the UE ID, all the UE IDs may be transmitted using RRC signaling, MAC CE, or MAC packet, where the transmission message may further include the group ID, so as to facilitate the receiving UE to identify whether the UE belongs to the same group.

Example 2:

this embodiment mainly describes updating the UE ID

One implementation refers to fig. 5:

the UE1 updates its ID, the UE1 sends the ID before update (old ID) and the ID after update (new ID) to the UE2 and the UE3, so that the UE2 and the UE3 update the ID of the UE 1;

the UE1 may send its ID before update and its ID after update to the UE2 and UE3 in a multicast manner, and receive the feedback of the UE2 and UE3 on the multicast information until the UE2 and UE3 can receive the multicast information correctly, and then stop sending the multicast information.

The UE1 may also send its ID before update and its ID after update to the UE2 and the UE3 respectively in unicast mode, and receive the feedback of the UE2 and the UE3 to the unicast information, and stop sending until the UE2 and the UE3 can both receive correctly

When the UE1 transmits the UE ID, the UE ID may be transmitted using RRC signaling, MAC CE, or MAC packets

The sending message may or may not include the group ID, because the receiving UE may determine that the UE belongs to the same group according to the pre-update ID of the UE.

Another implementation is described with reference to fig. 6:

if the UE1 updates its ID, the UE1 sends the ID before updating (old ID) and the ID after updating (new ID) to the group head (or cluster head) UE or the base station, so that the group head (or cluster head) UE or the base station updates the ID of the UE 1;

the group head UE or the base station sends the ID before updating and the ID after updating of the UE1 to other UEs in the group;

the UE1 sends the ID before updating and the ID after updating to the group head UE in a unicast manner, and receives feedback of the group head UE on unicast information, and stops sending until the group head UE receives the unicast information correctly; or the UE1 sends the ID before the update and the ID after the update to the base station, and stops sending until the base station is determined to receive correctly.

The group head UE or the base station may send the ID before update and the ID after update of the UE1 to the UE2 and the UE3 in a multicast manner, and receive the feedback of the UE2 and the UE3 on the multicast information, and stop sending until the UE2 and the UE3 can receive the multicast information correctly (the multicast information and the UE1 may also receive the multicast information).

The head-of-group UE or the base station can also respectively send the ID before updating and the ID after updating to the UE2 and the UE3 in a unicast mode, receive the feedback of the UE2 and the UE3 to the unicast information, and stop sending the unicast information until the UE2 and the UE3 can both correctly receive the unicast information

When the group head or the base station transmits the UE ID, all the UE IDs may be transmitted using RRC signaling, MAC CE, or MAC packet.

The group head UE or the message sent by the base station may or may not include the group ID, because the receiving UE may determine that the UE belongs to the same group according to the pre-update ID of the UE.

Example 3:

this embodiment mainly describes determining the ID of a newly joining UE

One implementation refers to fig. 7:

UE4 is a newly joined UE, then UE4 sends its ID to UE1, UE2, and UE3, so that UE1, UE2, and UE3 determine the ID of UE 4;

the UE4 can send its ID to UE1, UE2 and UE3 in multicast mode, and receive the feedback of UE1, UE2 and UE3 to the multicast information, and stop sending until UE1, UE2 and UE3 can all receive correctly;

the UE4 may also send its ID to UE1, UE2, and UE3 in unicast, and receive feedback of the unicast information from UE1, UE2, and UE3, until UE1, UE2, and UE3 can all receive correctly, and then stop sending;

UE1, UE2, and UE3 also need to send their IDs to UE4, UE1, UE2, and UE3, respectively, which may send their IDs in multicast or unicast to UE4

When the UE transmits the UE ID, the UE ID may be transmitted using RRC signaling, MAC CE, or MAC packet, where the transmission message may include a group ID in addition to the UE ID, so that the receiving UE may identify whether the UE belongs to the same group.

Another implementation is described with reference to fig. 8:

if the UE4 is a newly added UE, the UE4 sends its ID to the head-of-group UE or the base station, so that the head-of-group UE or the base station obtains the ID of the UE 4;

the head-of-group UE or the base station sends the ID of the UE4 to other UEs in the group and sends the IDs of the other UEs (UE1, UE2 and UE3) to the UE 4;

the UE4 sends its ID to the head-of-group UE by unicast mode, and receives the feedback of the head-of-group UE to the unicast information, and stops sending until the head-of-group UE receives correctly, or the UE4 sends its ID to the base station, and stops sending until the base station receives correctly;

the group head UE or the base station can send the IDs of the UE1, the UE2, the UE3 and the UE4 to the UE1, the UE2, the UE3 and the UE4 in a multicast mode and receive the feedback of the UE1, the UE2, the UE3 and the UE4 to the multicast information, and the sending is stopped until the UE1, the UE2, the UE3 and the UE4 can receive the multicast information correctly;

the head-of-group UE or the base station may also respectively send UE IDs to UE1, UE2, UE3, and UE4 in a unicast manner, that is, send IDs of UE4 to UE1, UE2, and UE3, send IDs of UE1, UE2, and UE3 to UE4, and receive feedback of UE1, UE2, UE3, and UE4 on unicast information, until UE1, UE2, UE3, and UE4 can all receive correctly, and then stop sending.

When the group head or the base station transmits the UE ID, all the UE IDs may be transmitted using RRC signaling, MAC CE, or MAC packet. The group head UE and the base station may also include a group ID in the message sent by the base station, in addition to the UE ID, so as to facilitate the receiving UE to identify whether the UE belongs to the same group or not

Example 4:

this embodiment mainly describes determining the ID of the departing UE

One implementation refers to fig. 9:

UE3 is the UE to leave, then UE3 sends its ID to UE1 and UE 2;

the UE3 can send its ID to the UE1 and the UE2 in a multicast mode, and receive the feedback of the UE1 and the UE2 to the multicast information, and stop sending until the UE1 and the UE2 can both receive the multicast information correctly, and leave the group; the UE3 may also send its ID to the UE1 and the UE2 in unicast, and receive the feedback of the UE1 and the UE2 on the unicast information, and stop sending until the UE1 and the UE2 can both receive the unicast information correctly, and leave the group;

when the UE sends the UE ID, the UE ID may be sent using RRC signaling, MAC CE, or MAC packet, where the sending message may or may not include the group ID, because the receiving UE may determine that the UE belongs to the same group according to the UE ID.

Another implementation is described with reference to fig. 10:

if the UE3 is a departing UE, the UE3 sends its ID to the head-of-group UE, or the base station;

the group head UE or the base station sends the ID of the UE3 to other UEs in the group;

the UE3 sends its ID to the group head UE in unicast and receives feedback of the group head UE on unicast information, and stops sending until the group head UE receives correctly; or the UE3 sends its ID to the base station, and stops sending until it is determined that the base station receives correctly;

the head-of-group UE or the base station can send the ID of the UE3 to the UE1 and the UE2 in a multicast mode, receive the feedback of the UE1 and the UE2 on the multicast information, and stop sending the multicast information until the UE1 and the UE2 can correctly receive the multicast information;

the head-of-group UE or the base station may also send the UE3 ID to the UE1 and the UE2 respectively in a unicast manner, and receive the feedback of the UE1 and the UE2 on the unicast information, and stop sending until the UE1 and the UE2 can both receive the unicast information correctly.

When the group head or the base station transmits the UE ID, all the UE IDs may be transmitted using RRC signaling, MAC CE, or MAC packet, where the transmission message of the group head UE or the base station may or may not include the group ID, because the receiving UE may determine that the UE belongs to the same group according to the UE ID.

Referring to fig. 11, fig. 11 is a structural diagram of a terminal according to an embodiment of the present invention, where the terminal is a first terminal, and as shown in fig. 11, a terminal 1100 includes:

a first obtaining module 1101, configured to obtain an identifier of each terminal in the terminal group;

a selecting module 1102, configured to select a feedback resource of the direct communication link according to the identifier of each terminal.

Optionally, the first terminal obtains the identifier of each terminal through at least one of an application layer, an AS layer, and a physical layer.

Optionally, as shown in fig. 12, the terminal 1100 further includes:

a second obtaining module 1103, configured to obtain a first identifier of a second terminal in the terminal group;

The second terminal is a terminal joining the terminal group; or

The second terminal is a terminal leaving the terminal group.

Optionally, when the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

In the case that the second terminal is a terminal leaving the terminal group:

Optionally, in a case that the indication information includes the first identifier and indicates a receiving terminal to select a feedback resource using the first identifier, the receiving terminal may select the feedback resource according to the first identifier included in the indication information; or

in the case that the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

when the second terminal is a terminal joining or leaving the terminal group:

Optionally, when the second terminal is a terminal joining the terminal group:

in the case that the second terminal is a terminal leaving the terminal group:

The first terminal provided in the embodiment of the present invention can implement each process in the method embodiment shown in fig. 2, and can obtain the same beneficial effects, and is not described herein again to avoid repetition.

Referring to fig. 13, fig. 13 is a structural diagram of another terminal according to an embodiment of the present invention, where the terminal is a first terminal, and as shown in fig. 13, the terminal includes: a transceiver 1310, a memory 1320, a processor 1300, and a program stored on the memory 1320 and executable on the processor 1300, wherein:

the transceiver 1310 is configured to obtain an identifier of each terminal in the terminal group;

the transceiver 1310 or the processor 1300 is configured to select a feedback resource of a direct communication link according to the identifier of each terminal.

Among other things, the transceiver 1310 may be used to receive and transmit data under the control of the processor 1300.

In fig. 13, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1300 and various circuits of memory represented by memory 1320 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1310 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1320 may store data used by the processor 1300 in performing operations.

It should be noted that the memory 1320 is not limited to be located on the first terminal, and the memory 1320 and the processor 1300 may be separated and located in different geographical locations.

Optionally, the transceiver 1310 is further configured to:

acquiring a first identifier of a second terminal in the terminal group;

The second terminal is a terminal joining the terminal group; or

The second terminal is a terminal leaving the terminal group.

Optionally, when the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

In the case that the second terminal is a terminal leaving the terminal group:

in the case that the second terminal is a terminal leaving the terminal group:

Optionally, when the second terminal is a terminal that updates the identifier:

when the second terminal is a terminal joining or leaving the terminal group:

Optionally, when the second terminal is a terminal joining the terminal group:

in the case that the second terminal is a terminal leaving the terminal group:

It should be noted that, in this embodiment, the first terminal may be a first terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the first terminal in the method embodiment of the present invention may be implemented by the first terminal in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transmission method of the direct link according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. a feedback resource selection method, is characterized in that, comprises:

The first terminal acquires the identifier of each terminal in the terminal group;

The first terminal selects the feedback resources of the direct communication link according to the identifiers of the terminals.

2 . The method according to claim 1 , wherein the first terminal acquires the identifier of each terminal through at least one of an application layer, an access layer AS layer, and a physical layer. 3 .

3. The method according to claim 2, wherein the first terminal acquires the identifier of each terminal in the terminal group through an AS layer or a physical layer; or

The first terminal acquires, through the AS layer or the physical layer, the identifiers of the terminals sent by the group head terminal of the terminal group or the network side device.

4. The method of claim 1, wherein the method further comprises:

acquiring, by the first terminal, a first identifier of a second terminal in the terminal group;

Wherein, the second terminal is a terminal whose identity is updated, and the first identity is an updated identity of the second terminal; or

The second terminal is a terminal that joins the terminal group; or

The second terminal is a terminal that leaves the terminal group.

5. The method of claim 4, wherein the first terminal acquires the first identifier of the second terminal through at least one of an application layer, an AS layer, and a physical layer.

6 . The method according to claim 4 , wherein, when sending the multicast information, a sending terminal that performs a multicast service in the terminal group instructs the receiving terminal whether to use the first identifier to select a feedback resource, wherein: 6 . The first terminal is the sending terminal or the receiving terminal.

7. The method according to claim 6, wherein, when the second terminal is a terminal with an updated identity or a terminal added to the terminal group:

If the sending terminal receives the first identifier, the sending terminal instructs the receiving terminal to use the first identifier to select a feedback resource when sending the multicast information;

If the receiving terminal receives the first identifier, the receiving terminal selects a feedback resource by using the first identifier;

If the receiving terminal does not receive the first identifier, the receiving terminal does not send feedback information.

8. The method according to claim 6, wherein, when the second terminal is a terminal leaving the terminal group:

If the sending terminal receives the first identifier, the sending terminal instructs the receiving terminal not to use the first identifier to select a feedback resource when sending the multicast information;

If the receiving terminal receives the first identifier, the receiving terminal does not use the first identifier to select a feedback resource;

9. The method of claim 6, wherein, in the case that the second terminal is a terminal with an updated identity:

When sending the multicast information, the sending terminal instructs the receiving terminal not to use the first identifier to select the feedback resource, and the receiving terminal uses the identifier of the second terminal before the update to select the feedback resource, or the sending terminal When sending multicast information, if the receiving terminal does not receive an indication from the sending terminal, the receiving terminal selects a feedback resource by using the pre-update identifier of the second terminal; and/or

In the case that the second terminal is a terminal that joins the terminal group:

When sending the multicast information, the sending terminal instructs the receiving terminal not to use the first identifier to select the feedback resource, the receiving terminal does not use the first identifier of the second terminal to select the feedback resource, or the sending terminal is sending the information. When multicasting information, the receiving terminal does not receive the indication of the sending terminal, the receiving terminal does not use the first identifier of the second terminal to select the feedback resource; and/or

In the case that the second terminal is a terminal leaving the terminal group:

When sending the multicast information, the sending terminal instructs the receiving terminal to use the first identifier to select the feedback resource, and the receiving terminal uses the first identifier to select the feedback resource, or, when the sending terminal sends the multicast information , the receiving terminal does not receive the indication of the sending terminal, and the receiving terminal selects the feedback resource by using the first identifier.

10. The method according to claim 6, wherein the sending terminal indicates whether the receiving terminal uses the first identifier to select feedback resources through 1-bit indication information; or

The sending terminal instructs the receiving terminal whether to use the first identifier to select a feedback resource through the indication information including the first identifier.

11. The method according to claim 10, wherein, when the indication information includes the first identifier, and instructs the receiving terminal to use the first identifier to select the feedback resource, the receiving terminal selects the feedback resource according to the first identifier. selecting the feedback resource by the first identifier included in the indication information; or

In the case where the indication information includes the first identifier and instructs the receiving terminal not to use the first identifier to select feedback resources, the receiving terminal does not use the first identifier included in the indication information to select feedback resources .

12. The method according to claim 4, wherein, when the second terminal is a terminal with an updated identity or a terminal added to the terminal group:

Receive the first identifier sent by the group head terminal of the terminal group or the network side device within a first time, and after the first time expires, use the first identifier to select a feedback resource;

In the case that the second terminal is a terminal leaving the terminal group:

Receive the first identifier sent by the group head terminal of the terminal group or the network side device within a second time, and after the second time expires, select a feedback resource without using the first identifier;

The first time and the second time are pre-configured or configured by the group head terminal or the network side device, and the first time and the second time exist or do not overlap.

13. The method according to claim 12, wherein, if a message that no terminal update identifier or join is sent from a group head terminal of the terminal group or a network side device is received within the first time, determining In the first time, no terminal has updated the identity or joined; and/or, if no message is received from the group head terminal of the terminal group or the network side device within the first time, then in the first time After the time expires, no feedback information will be sent;

If a message that no terminal has left from the group head terminal of the terminal group or the network-side device is received within the second time, it is determined that no terminal leaves within the second time; and/or, if within the second time If no message is received from the group head terminal of the terminal group or the network side device within the second time, no feedback information is sent after the second time expires.

14. The method according to claim 4, wherein, in the case that the second terminal is a terminal with an updated identity:

The first terminal obtains, through the AS layer or the physical layer, the first identifier sent by the second terminal and the second identifier before the second terminal is updated; or

The first terminal obtains, through the AS layer or the physical layer, the first identifier sent by the group head terminal of the terminal group or the network side device and the second identifier before the second terminal is updated;

When the second terminal is a terminal that joins or leaves the terminal group:

The first terminal obtains the first identifier sent by the second terminal through the AS layer or the physical layer; or

The first terminal acquires the first identifier sent by the group head terminal of the terminal group or the network side device through the AS layer or the physical layer.

15. The method according to claim 14, wherein, when the second terminal is a terminal that joins or leaves the terminal group:

The first terminal acquires, through the AS layer or the physical layer, the indication information that the second terminal joins or leaves the terminal group.

16. The method according to claim 14, wherein, when the second terminal is a terminal that joins the terminal group:

acquiring, by the second terminal, an identifier of each terminal in the terminal group;

In the case that the second terminal is a terminal leaving the terminal group:

The second terminal leaves the terminal group when each terminal in the terminal group receives the first identifier.

17. A terminal, wherein the terminal is a first terminal, comprising:

a first acquisition module, configured to acquire the identifiers of each terminal in the terminal group;

The selection module is used for selecting the feedback resources of the direct communication link according to the identifiers of the terminals.

18. The terminal of claim 17, wherein the terminal further comprises:

a second obtaining module, configured to obtain the first identifier of the second terminal in the terminal group;

The second terminal is a terminal that joins the terminal group; or

The second terminal is a terminal that leaves the terminal group.

19 . The terminal according to claim 18 , wherein, when sending the multicast information, a sending terminal that performs a multicast service in the terminal group instructs the receiving terminal whether to use the first identifier to select a feedback resource, wherein: 19 . The first terminal is the sending terminal or the receiving terminal.

20. The terminal according to claim 18, wherein, when the second terminal is a terminal with an updated identity or a terminal added to the terminal group:

In the case that the second terminal is a terminal leaving the terminal group:

21. The terminal according to claim 18, wherein, in the case that the second terminal is a terminal with an updated identity:

When the second terminal is a terminal that joins or leaves the terminal group:

22. A terminal, the terminal is a first terminal, comprising: a transceiver, a memory, a processor, and a program stored in the memory and running on the processor, characterized in that,

The transceiver is used to obtain the identification of each terminal in the terminal group;

The transceiver or the processor is configured to select feedback resources of the direct communication link according to the identifiers of the terminals.

23. The terminal of claim 22, wherein the terminal further comprises:

The second terminal is a terminal that joins the terminal group; or

The second terminal is a terminal that leaves the terminal group.

24. The terminal according to claim 23, wherein, when sending the multicast information, a sending terminal that performs a multicast service in the terminal group indicates whether the receiving terminal uses the first identifier to select a feedback resource, wherein: The first terminal is the sending terminal or the receiving terminal.

25. The terminal according to claim 24, wherein, in the case that the second terminal is a terminal with an updated identity or a terminal added to the terminal group:

26. The terminal according to claim 24, wherein, when the second terminal is a terminal that leaves the terminal group:

27. The terminal according to claim 24, wherein, in the case that the second terminal is a terminal with an updated identity:

When sending the multicast information, the sending terminal instructs the receiving terminal not to use the first identifier to select feedback resources, the receiving terminal does not use the first identifier of the second terminal to select feedback resources, or the sending terminal is sending When multicasting information, the receiving terminal does not receive the indication of the sending terminal, the receiving terminal does not use the first identifier of the second terminal to select the feedback resource; and/or

In the case that the second terminal is a terminal leaving the terminal group:

When sending multicast information, the sending terminal instructs the receiving terminal to use the first identifier to select feedback resources, and the receiving terminal uses the first identifier to select feedback resources, or, when sending multicast information, the sending terminal , the receiving terminal does not receive the indication of the sending terminal, and the receiving terminal selects the feedback resource by using the first identifier.

28. The terminal according to claim 23, wherein, when the second terminal is a terminal with an updated identity or a terminal added to the terminal group:

In the case that the second terminal is a terminal leaving the terminal group:

Receive the first identifier sent by the group head terminal of the terminal group or the network side device within the second time, and after the second time expires, select the feedback resource without using the first identifier;

29. The terminal according to claim 23, wherein, in the case that the second terminal is a terminal with an updated identity:

When the second terminal is a terminal that joins or leaves the terminal group:

30. A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the steps in the feedback resource selection method according to any one of claims 1 to 16 are implemented.