Information transmission method and communication device

Abstract

The application provides an information transmission method and a communication device. The method comprises the following steps: receiving first information sent by a source access network device, wherein the first information is used for determining a first RA-RNTI and a first beam, the first RA-RNTI is used for scrambling a first PDCCH, the first PDCCH is used for carrying scheduling information of msg2, and the first beam is used for transmitting msg1 and msg2; determining the first RA-RNTI and the first beam based on the first information; receiving a first PDCCH broadcast by a target access network device; performing descrambling on the first PDCCH based on the first RA-RNTI to obtain scheduling information of msg2; and receiving msg2 broadcast by the target access network device through the first beam based on the scheduling information of msg2. According to the method provided by the application, the non-group head UE can accurately receive the TA information of the group head UE and the uplink resource allocation information of the non-group head UE.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, and in particular to an information transmission method and a communication device. BACKGROUND

[0002] In a mobile communication system, in a basic handover procedure, the mobility management of a connected user equipment (UE) is controlled by an access network device, i.e., the access network device instructs the UE to hand over to which cell and how to hand over by sending a handover message. For example, an existing cell handover procedure can be as shown in FIG. 1. In the procedure, the following steps are performed: Figure 1

[0003] 101. A source base station sends a radio resource control (RRC) reconfiguration message to a connected UE. For example, the RRC reconfiguration message can contain parameters such as measurement objects, reporting configurations, measurement identities, etc.

[0004] 102. After the UE performs measurements on a series of cells according to the RRC reconfiguration message, the UE forms a measurement report and reports the measurement report to the source base station to which the UE is currently connected.

[0005] 103. After the source base station receives the measurement report, the source base station determines whether the UE needs to perform cell handover.

[0006] 104. If it is determined that the UE needs to perform cell handover, the source base station sends a handover request message to a target base station.

[0007] 105. After the target base station receives the handover request, the target base station determines whether to allow access of the UE according to, for example, the number of connections of the target base station.

[0008] 106. If the access of the UE is allowed, the target base station sends a handover confirm message to the source base station. For example, the handover confirm message contains information about the target cell and configuration parameters required for the UE to access the target cell.

[0009] 107. After the source base station receives the handover confirm message sent by the target base station, the source base station sends an RRC reconfiguration message (i.e., a handover command) to the UE. The content of the RRC reconfiguration message comes from the handover confirm message of step 106, and the source base station is transparent.

[0010] 108. After the UE receives the RRC reconfiguration message, the UE initiates random access to the target base station according to the RRC reconfiguration message.

[0011] In the existing handover procedure, the UE disconnects from the source base station, and before successfully accessing the target base station, the UE transmits and receives data for a short time.

[0012] ​109、The UE sends an RRC reconfiguration complete message to the target base station.

[0013] 110、After the target base station receives the RRC reconfiguration complete message, the target base station sends a context release message to the source base station to let the source base station release the context of the UE.

[0014] The random access procedure of step 108 can be expanded as shown in Figure 2

[0015] 201、The UE sends a message 1 (msg1) to the target base station using the beam 1 corresponding to the SSB. The msg1 includes a preamble.

[0016] Specifically, the UE can select an SSB with a signal quality higher than a threshold value, and send a msg1 to the target base station using a beam 1 corresponding to the selected SSB.

[0017] 202、After the target base station receives the msg1, the target base station sends a message 2 (msg2) to the UE using the beam 1. The msg2 includes timing advance (TA) information for uplink synchronization of the UE and initial uplink resource allocation information (UL grant).

[0018] Before the target base station sends the msg2, the target base station can also send a PDCCH for scheduling the msg2. The PDCCH is scrambled by a random access radio network temporary identifier (RA-RNTI). The target base station can determine the RA-RNTI based on the time-frequency resource of the preamble after receiving the msg1.

[0019] Correspondingly, the UE also determines the RA-RNTI based on the time-frequency resource of the preamble. The UE descrambles the PDCCH by the RA-RNTI to obtain the scheduling information of the msg2. The UE receives the msg2 using the beam 1 based on the scheduling information of the msg2.

[0020] In order to save signaling overhead, a group handover (Group HO) technique is currently proposed. The source base station can regard multiple UEs as a "group", and make cell handover decision in a group unit. When cell handover is needed, the source base station requests the target base station to perform cell handover in a group unit. After the source base station sends a group handover request to the target base station, the target base station prepares resources for all UEs in the group.

[0021] ​In consideration of the proximity between the UEs in the group, to save signaling overhead, the group head UE can be caused to send msg1, and the non-group head UE can not send msg1. The non-group head UE can directly receive msg2, which contains the TA information of the group head UE and the uplink resource allocation information of all UEs. The non-group head UE performs uplink synchronization according to the TA information of the group head UE. How the non-group head UE accurately receives the TA information of the group head UE and the uplink resource allocation information of the non-group head UE is a problem to be solved at present. SUMMARY

[0022] Embodiments of the present application provide an information transmission method and a communication device, which are beneficial to the non-group head UE to accurately receive the TA information of the group head UE and the uplink resource allocation information of the non-group head UE.

[0023] In a first aspect, the present application provides an information transmission method. Optionally, the method can be executed by a non-group head UE, or can be executed by a component (such as a processor, a chip, or a chip system, etc.) of the non-group head UE, or can be executed by a logic module or software capable of realizing all or part of the function of the non-group head UE. The method comprises:

[0024] receiving first information sent by a source access network device, the first information being used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI being used to scramble a first physical downlink control channel (PDCCH), the first PDCCH being used to carry scheduling information of a message (msg) 2, the first beam being used to transmit msg1 and msg2, the msg1 including a preamble, and the msg2 including time advance (TA) information of a group head UE in a UE group and uplink resource allocation information of all UEs in the UE group; determining the first RA-RNTI and the first beam based on the first information; receiving a first PDCCH scrambled by the first RA-RNTI broadcast by a target access network device; based on the first RA-RNTI, descrambling the first PDCCH to obtain the scheduling information of the msg2; and based on the scheduling information of the msg2, receiving the msg2 broadcast by the target access network device through the first beam.

[0025] It can be seen that, based on the method described in the first aspect, the non-group head UE can obtain the first RA-RNTI and the first beam used to transmit the msg2, so as to analyze the first PDCCH based on the first RA-RNTI to obtain the scheduling information of the msg2, and then receive the msg2 based on the scheduling information of the msg2 and the first beam. The msg2 includes the TA information of the group head UE and the uplink resource allocation information of the non-group head UE. Therefore, based on the method described in the first aspect, it is beneficial to the non-group head UE to accurately receive the TA information of the group head UE and the uplink resource allocation information of the non-group head UE.

[0026] In a possible implementation, the specific implementation of receiving the first information sent by the source access network device is that the source access network device sends the first information through a radio resource control (RRC) message. The first information is sent through an RRC message, which has less modification on the existing protocol.

[0027] In a possible implementation, the specific implementation of receiving the first information sent by the source access network device is that the source access network device broadcasts a second PDCCH scrambled by a G-RNTI of the UE group, and the second PDCCH is used to carry scheduling information of the first information; the scheduling information of the first information is obtained by descrambling the second PDCCH based on the G-RNTI of the UE group; and the first information broadcast by the source access network device is received based on the scheduling information of the first information. The first information is sent in a broadcast manner, which can save signaling overhead.

[0028] In a possible implementation, after receiving the first information sent by the source access network device, third information indicating that the non-group head UE has received the first information can be sent to the source access network device. The source access network device can be indicated that the non-group head UE has received the first information, so that the source access network device can notify the target access network device that the first PDCCH and msg2 can be sent when all non-group head UEs receive the first information. Thus, the target access network device can be prevented from sending the first PDCCH and msg2 too early, which causes the non-group head UE to fail to successfully receive the first PDCCH and msg2.

[0029] In a possible implementation, the first information indicates one or more of the following information: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam. Based on the possible implementation, the non-group head UE can accurately determine the first RA-RNTI and the first beam.

[0030] In a possible implementation, before receiving the first information sent by the source access network device, a second command sent by the source access network device can also be received. The second command carries an identifier of the group head UE, or the second command carries information indicating that the UE receiving the second command is a non-group head UE, or the second command is different from a first command sent by the source access network device to the group head UE, the first command indicates that the UE receiving the first command is a group head UE, and the second command indicates that the UE receiving the second command is a non-group head UE. Based on the possible implementation, the second command can be used to notify which UE is a non-group head UE, so that the non-group head UE can perform corresponding operations.

[0031] In a possible implementation, the second command also carries a group mobile user temporary identifier (G-RNTI) of the UE group. Based on this possible implementation, the non-group header UE can obtain the G-RNTI, and thus can subsequently parse the second PDCCH based on the G-RNTI to obtain the scheduling information of the first information.

[0032] In a possible implementation, the first command and the second command indicate a cell switching. Based on this possible implementation, the first command and the second command are used for both the cell switching and the indication of the non-group header UE, and thus it is possible to avoid increasing additional signaling and save signaling overhead.

[0033] In a second aspect, the present application provides an information transmission method. Optionally, the method can be executed by a source access network device, a component (for example, a processor, a chip, or a chip system) of the source access network device, or a logic module or software capable of implementing all or part of the functions of the source access network device. The method comprises the following steps:

[0034] receiving first information sent by a target access network device, the first information being used to determine a first random access wireless network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI being used to scramble a first physical downlink control channel (PDCCH), the first PDCCH being used to carry scheduling information of a message (msg) 2, the first beam being used to transmit the msg1 and the msg2, the msg1 comprising a preamble, and the msg2 comprising time advance (TA) information of a group header UE in a UE group and uplink resource allocation information of all UEs in the UE group; and sending the first information to non-group header UEs in the UE group.

[0035] In a possible implementation, the specific implementation of sending the first information to the non-group header UEs in the UE group is that the first information is sent to the non-group header UEs in the UE group through a radio resource control (RRC) message.

[0036] In a possible implementation, the specific implementation of sending the first information to the non-group header UEs in the UE group is that a second PDCCH is broadcast, the second PDCCH being scrambled by a group mobile user temporary identifier (G-RNTI) of the UE group, the second PDCCH being used to carry scheduling information of the first information; and the first information is broadcast.

[0037] In a possible implementation, after the first information is sent to the non-group header UEs in the UE group, a timer can be started; and when the timer expires, second information is sent to the target access network device, the second information indicating that the first PDCCH and the msg2 are sent. Based on this possible implementation, it is possible to avoid the target access network device from sending the first PDCCH and the msg2 too early, which causes the non-group header UEs to fail to successfully receive the first PDCCH and the msg2.

[0038] In a possible implementation, after the first information is sent to the non-group header UEs in the UE group, the second information indicating that the first PDCCH and msg2 are sent can also be sent to the target access network device when all the third information sent by the non-group header UEs is received, the third information indicating that the non-group header UEs have received the first information. Based on the possible implementation, the target access network device can be prevented from sending the first PDCCH and msg2 too early, which can cause the non-group header UEs to fail to successfully receive the first PDCCH and msg2.

[0039] In a possible implementation, the first information indicates one or more of the following information: a first RA-RNTI, a preamble corresponding physical random access channel (PRACH) resource, a preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam.

[0040] In a possible implementation, before the first information sent by the target access network device is received, the following steps can also be performed: sending a group switching request to the target access network device, the group switching request being used to request cell switching of the UE group, and an identifier of the group header UE being carried in the group switching request; receiving switching confirmation information sent by the target access network device; sending a first command to the group header UE; and sending a second command to the non-group header UEs, wherein the identifier of the group header UE is carried in the first command and the second command; or the first command carries information indicating that the UE receiving the first command is the group header UE, and the second command carries information indicating that the UE receiving the second command is the non-group header UE; or the signaling names of the first command and the second command are different, the first command indicates that the UE receiving the first command is the group header UE, and the second command indicates that the UE receiving the second command is the non-group header UE.

[0041] In a possible implementation, the second command also carries a group mobile user temporary identifier (G-RNTI) of the UE group.

[0042] In a possible implementation, the first command and the second command indicate cell switching.

[0043] In a third aspect, the present application provides an information transmission method. Optionally, the method can be executed by a target access network device, a component (for example, a processor, a chip, or a chip system) of the target access network device, or a logic module or software capable of realizing all or part of the functions of the target access network device. The method comprises the following steps:

[0044] receive a message (msg) 1 sent by a group head UE in a user equipment (UE) group using a first beam, the msg 1 comprising a preamble; send first information to a source access network device, the first information being used for determining a first random access radio network temporary identifier (RA-RNTI) and the first beam, the first RA-RNTI being used for scrambling a first physical downlink control channel (PDCCH), the first PDCCH being used for carrying scheduling information of a msg 2, the msg 2 comprising time advance (TA) information of the group head UE and uplink resource allocation information of all UEs in the UE group; broadcast the first PDCCH scrambled by the first RA-RNTI; and broadcast the msg 2 through the first beam.

[0045] In a possible implementation, before the first PDCCH scrambled by the first RA-RNTI is sent, second information sent by the source access network device can also be received, the second information indicating that the first PDCCH and the msg 2 are sent.

[0046] In a possible implementation, the first information indicates one or more of the following information: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam.

[0047] In a possible implementation, before the msg 1 sent by the group head UE in the UE group using the first beam is received, a group switch request sent by the source access network device can also be received, the group switch request being used for requesting cell switching of the UE group, and an identifier of the group head UE being carried in the group switch request; and switch confirmation information is sent to the source access network device.

[0048] The beneficial effects of the second aspect and the third aspect can refer to the beneficial effects of the first aspect, which are not described herein again.

[0049] In a fourth aspect, the present application provides an information transmission method. Optionally, the method can be executed by a non-group head UE, or by a component (for example, a processor, a chip, or a chip system) of the non-group head UE, or by a logic module or software capable of realizing all or part of the functions of the non-group head UE. The method comprises the following steps:

[0050] receive a first PDCCH scrambled by a group mobile user temporary identifier (G-RNTI) of a UE group broadcast by a target access network device, the first PDCCH being used for carrying scheduling information of first information; based on the G-RNTI, the first PDCCH is descrambled to obtain the scheduling information of the first information; and based on the scheduling information of the first information, the first information broadcast by the target access network device is received, the first information comprising time advance (TA) information of a group head UE in the UE group and uplink resource allocation information of all non-group head UEs in the UE group.

[0051] Based on the method described in the fourth aspect, the target access network device can broadcast the TA information of the group head UE in the UE group and the uplink resource allocation information of all non-group head UEs in the UE group based on the G-RNTI. Thus, the non-group head UEs can receive the TA information of the group head UE and the uplink resource allocation information of all non-group head UEs in the UE group based on the G-RNTI.

[0052] In a possible implementation, a second command sent by the source access network device can also be received, and the second command carries the G-RNTI of the UE group; wherein the second command also carries the identification of the group head UE; or the second command also carries information indicating that the UE receiving the second command is a non-group head UE; or the signaling name of the second command is different from that of the first command sent by the source access network device to the group head UE, the first command indicates that the UE receiving the first command is a group head UE, and the second command indicates that the UE receiving the second command is a non-group head UE. Based on this possible implementation, it can be informed through the second command which UEs are non-group head UEs, so that the non-group head UEs can perform corresponding operations. And the G-RNTI of the UE group can be indicated through the second command, and the scheduling information of the first information can be obtained by descrambling the first PDCCH based on the G-RNTI.

[0053] In a possible implementation, the first command and the second command indicate cell switching. Based on this possible implementation, the first command and the second command are used for both cell switching and indicating non-group head UEs, which can avoid increasing additional signaling and save signaling overhead.

[0054] In a fifth aspect, the present application provides an information transmission method. Optionally, the method can be executed by a target access network device, or by a component (such as a processor, a chip, or a chip system, etc.) of the target access network device, or by a logic module or software capable of realizing all or part of the functions of the target access network device. The method comprises:

[0055] receiving a message (msg) 1 sent by a group head UE in a user equipment (UE) group using a first beam, the msg1 comprising a preamble; broadcasting a msg2 through the first beam; broadcasting a first PDCCH scrambled by a group mobile user temporary identifier (G-RNTI) of the UE group, the first PDCCH being used to carry scheduling information of first information; and broadcasting the first information, the first information comprising time advance (TA) information of the group head UE and uplink resource allocation information of all non-group head UEs in the UE group.

[0056] In a possible implementation, before receiving the message (msg) 1 sent by the group head UE in the UE group using the first beam, the source access network device can also receive a group switching request sent by the source access network device, the group switching request being used to request cell switching of the UE group, the group switching request carrying an identifier of the group head UE and a G-RNTI of the UE group; and the source access network device sends switching confirmation information to the target access network device.

[0057] In a sixth aspect, the present application provides an information transmission method. Optionally, the method can be executed by a source access network device, or by a component (for example, a processor, a chip, or a chip system, etc.) of the source access network device, or by a logic module or software capable of realizing all or part of the functions of the source access network device. The method comprises:

[0058] sending a group switching request to the target access network device, the group switching request being used to request cell switching of the UE group, the group switching request carrying an identifier of the group head UE in the UE group and a G-RNTI of the UE group; receiving switching confirmation information sent by the target access network device; sending a first command to the group head UE; and sending a second command to the non-group head UE, the second command carrying the G-RNTI of the UE group; wherein the first command and the second command further carry the identifier of the group head UE; or the first command further carries information indicating that the UE receiving the first command is the group head UE, and the second command further carries information indicating that the UE receiving the second command is the non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates that the UE receiving the first command is the group head UE, and the second command indicates that the UE receiving the second command is the non-group head UE.

[0059] In a possible implementation, the first command and the second command indicate cell switching.

[0060] The beneficial effects of the fifth aspect and the sixth aspect can be referred to the beneficial effects of the fourth aspect, and will not be repeated here.

[0061] In a seventh aspect, the present application provides an information transmission method. Optionally, the method can be executed by a non-group head UE, or by a component (for example, a processor, a chip, or a chip system, etc.) of the non-group head UE, or by a logic module or software capable of realizing all or part of the functions of the non-group head UE. The method comprises:

[0062] receiving TA information of the group head UE and uplink resource allocation information of the non-group head UE in the UE group sent by the source access network device.

[0063] Based on the method described in the seventh aspect, the non-group head UE can accurately receive the TA information of the group head UE and the uplink resource allocation information of the non-group head UE in the UE group from the source access network device.

[0064] In a possible implementation, the specific implementation of receiving the TA information of the group header UE and the uplink resource allocation information of the non-group header UE in the UE group sent by the source access network device is that the source access network device sends the TA information of the group header UE and the uplink resource allocation information of the non-group header UE in the UE group through a radio resource control (RRC) message.

[0065] In a possible implementation, the specific implementation of receiving the TA information of the group header UE and the uplink resource allocation information of the non-group header UE in the UE group sent by the source access network device is that the source access network device broadcasts a first PDCCH scrambled by a group mobile user temporary identifier (G-RNTI) of the UE group, and the first PDCCH is used to carry scheduling information of first information, and the first information includes time advance (TA) information of the group header UE in the UE group and uplink resource allocation information of all non-group header UEs in the UE group; the first PDCCH is descrambled using the G-RNTI to obtain the scheduling information of the first information; and the source access network device broadcasts the first information based on the scheduling information of the first information.

[0066] In a possible implementation, a second command sent by the source access network device can also be received; the second command carries an identifier of the group header UE; or the second command carries information indicating that a UE receiving the second command is a non-group header UE; or the second command is different from a signaling name of a first command sent by the source access network device to the group header UE, the first command indicates that a UE receiving the first command is a group header UE, and the second command indicates that a UE receiving the second command is a non-group header UE. Based on this possible implementation, it can be informed through the second command which UEs are non-group header UEs, so that the non-group header UEs can perform corresponding operations.

[0067] In a possible implementation, the second command also carries a group mobile user temporary identifier (G-RNTI) of the UE group. Based on this possible implementation, the G-RNTI of the UE group can be indicated through the second command, and subsequently the first PDCCH can be descrambled based on the G-RNTI to obtain the scheduling information of the first information.

[0068] In a possible implementation, the first command and the second command indicate cell switching. In this possible implementation, the first command and the second command are used for both cell switching and indicating non-group header UEs, so that additional signaling can be avoided, and signaling overhead can be saved.

[0069] In an eighth aspect, the present application provides an information transmission method. Optionally, the method can be executed by a source access network device, a component (e.g., a processor, a chip, or a chip system, etc.) of the source access network device, a logic module or software capable of implementing all or part of the functions of the source access network device. The method comprises:

[0070] receiving first information sent by the target access network device, the first information comprising time advance (TA) information of a group head user equipment (UE) in a UE group and uplink resource allocation information of all non-group head UEs in the UE group; and sending the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs.

[0071] In a possible implementation, the specific implementation of sending the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs is that the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs are sent to the non-group head UEs through a radio resource control (RRC) message.

[0072] In a possible implementation, the specific implementation of sending the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs is that a first PDCCH is broadcasted, the first PDCCH is scrambled by a group radio network temporary identifier (G-RNTI) of the UE group, and the first PDCCH is used to carry scheduling information of the first information; and the first information is broadcasted.

[0073] In a possible implementation, the method further comprises: sending a group switching request to the target access network device, the group switching request being used to request cell switching of the UE group, and the group switching request carrying an identifier of the group head UE in the UE group; receiving switching confirmation information sent by the target access network device; sending a first command to the group head UE; and sending a second command to the non-group head UEs; wherein the first command and the second command carry the identifier of the group head UE; or the first command carries information indicating that a UE receiving the first command is the group head UE, and the second command carries information indicating that a UE receiving the second command is the non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates that a UE receiving the first command is the group head UE, and the second command indicates that a UE receiving the second command is the non-group head UE.

[0074] In a possible implementation, the second command further carries a group radio network temporary identifier (G-RNTI) of the UE group.

[0075] In a possible implementation, the first command and the second command indicate cell switching.

[0076] In a ninth aspect, the present application provides an information transmission method. Optionally, the method can be executed by a target access network device, or by a component (for example, a processor, a chip, or a chip system, etc.) of the target access network device, or by a logic module or software capable of realizing all or part of the functions of the target access network device. The method comprises:

[0077] receiving a message (msg) 1 sent by a group head UE in a user equipment (UE) group using a first beam, the msg 1 comprising a preamble; broadcasting a msg 2 using the first beam; and sending first information to the source access network device, the first information comprising time advance (TA) information of the group head UE and uplink resource allocation information of all non-group head UEs in the UE group.

[0078] In a possible implementation, before receiving the msg 1 sent by the group head UE in the UE group using the first beam, a group switching request sent by the source access network device can also be received, the group switching request being used to request cell switching of the UE group, and the group switching request carrying an identifier of the group head UE; and sending switching confirmation information to the source access network device.

[0079] The beneficial effects of the eighth aspect and the ninth aspect can refer to the beneficial effects of the seventh aspect, and will not be repeated here.

[0080] In a tenth aspect, the present application provides an information transmission method. Optionally, the method can be executed by a source access network device, or by a component (for example, a processor, a chip, or a chip system, etc.) of the source access network device, or by a logic module or software capable of realizing all or part of the functions of the source access network device. The method comprises: sending a first command to a group head UE in a UE group; and sending a second command to the group head UE in the UE group; wherein the first command and the second command carry an identifier of the group head UE; or the first command carries information indicating that a UE receiving the first command is the group head UE, and the second command carries information indicating that a UE receiving the second command is a non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates that a UE receiving the first command is the group head UE, and the second command indicates that a UE receiving the second command is the non-group head UE. Based on the possible implementation, which UE is the group head UE can be accurately informed through the first command, so that the group head UE can perform corresponding operations, and which UE is the non-group head UE can be accurately informed through the second command, so that the non-group head UE can perform corresponding operations.

[0081] In one possible implementation, the second command also carries the Group Mobile Subscriber Temporary Identifier (G-RNTI) of the UE group. Based on this possible implementation, the G-RNTI of the UE group can be indicated by the second command so that the TA information of the group head UE and the uplink resource allocation information of non-group head UEs can be received subsequently based on the G-RNTI.

[0082] In one possible implementation, the first and second commands indicate a cell handover. Based on this possible implementation, the first and second commands are used for both cell handover and to instruct non-header UEs, which can avoid adding extra signaling and save signaling overhead.

[0083] Eleventhly, this application provides an information transmission method. Optionally, this method can be executed by a non-header UE, by a component of the non-header UE (e.g., a processor, chip, or chip system), or by a logic module or software capable of implementing all or part of the functions of the non-header UE. The method includes:

[0084] Receive the second command sent by the source access network device;

[0085] The second command may carry the identifier of the group head UE; or, the second command may carry information indicating that the UE receiving the second command is a non-group head UE; or, the signaling name of the second command may be different from that of the first command sent by the source access network device to the group head UE, wherein the first command indicates that the UE receiving the first command is a group head UE, and the second command indicates that the UE receiving the second command is a non-group head UE.

[0086] In one possible implementation, the second command also carries the Group Mobile Subscriber Temporary Identifier (G-RNTI) of the UE group.

[0087] In one possible implementation, the first and second commands instruct cell handover to be performed.

[0088] In a twelfth aspect, this application provides an information transmission method. Optionally, this method can be executed by a header UE, by a component of the header UE (e.g., a processor, chip, or chip system), or by a logic module or software capable of implementing all or part of the header UE's functions. The method includes:

[0089] Receive the first command sent by the source access network device;

[0090] The first command carries an identifier of the group header UE, or the first command carries information indicating that the UE receiving the first command is the group header UE, or the signaling name of the first command is different from that of a second command sent by the source access network device to a non-group header UE, the first command indicates that the UE receiving the first command is the group header UE, and the second command indicates that the UE receiving the second command is the non-group header UE.

[0091] In a possible implementation, the first command and the second command indicate cell switching.

[0092] The beneficial effects of the eleventh aspect and the twelfth aspect can be referred to the beneficial effects of the tenth aspect, and details are not described herein.

[0093] In the thirteenth aspect, the present application provides a UE group determination method. Optionally, the method can be executed by a source access network device, a component (for example, a processor, a chip, or a chip system) of the source access network device, or a logic module or software capable of implementing all or part of the functions of the source access network device. The method comprises the following steps:

[0094] receiving measurement reports of multiple UEs; determining multiple second UEs from the multiple UEs based on the measurement reports of the multiple UEs, the measurement report of the second UE indicating that the signal quality of a neighbor cell is higher than the signal quality of a serving cell by more than a first threshold, or the signal quality of the serving cell is lower than a second threshold and the signal quality of the neighbor cell is higher than a third threshold; and determining whether to divide the multiple second UEs into a UE group based on the positions of the multiple second UEs.

[0095] Based on the possible implementation, the UE group that needs to perform cell switching can be accurately divided.

[0096] In a possible implementation, the specific implementation of determining whether to divide the multiple second UEs into a UE group based on the positions of the multiple second UEs is as follows: if the dispersion degree of the positions of the multiple second UEs is less than or equal to a fourth threshold, the multiple second UEs are divided into a UE group; or if the dispersion degree of the positions of the multiple second UEs is greater than the fourth threshold, the multiple second UEs are not divided into a UE group.

[0097] If the dispersion degree of the positions of the multiple second UEs is greater than the fourth threshold, it is considered that the multiple second UEs are far apart and are not suitable for using the group switching technology. Therefore, based on the possible implementation, the UE group that needs to perform cell switching can be reasonably divided.

[0098] In a possible implementation, in the UE group, the group header UE is closest to the center position of the UE group.

[0099] In a possible implementation, the method further includes determining the position of the second UE based on the best beam and time advance (TA) information corresponding to the second UE. Based on the possible implementation, the position of the second UE can be accurately determined.

[0100] In a fourteenth aspect, the present application provides a communication device, which can be a non-group head UE or a source access network device or a target access network device, or a device in the non-group head UE or the source access network device or the target access network device, or a device capable of being used in combination with the non-group head UE or the source access network device or the target access network device. The communication device can also be a chip system. The communication device can perform the method in any one of the first aspect to the thirteenth aspect. The functions of the communication device can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module can be software and / or hardware. The operations and advantages of the communication device can refer to the method and advantages of any one of the first aspect to the thirteenth aspect.

[0101] In a fifteenth aspect, the present application provides a communication device, which includes a processor. When the processor invokes a computer program in a memory, the method in any one of the first aspect to the thirteenth aspect is performed.

[0102] In a sixteenth aspect, the present application provides a communication device, which includes a processor and a memory. The processor and the memory are coupled. The processor is configured to implement the method in any one of the first aspect to the thirteenth aspect.

[0103] In a seventeenth aspect, the present application provides a communication device, which includes a processor, a memory, and a transceiver. The processor and the memory are coupled. The transceiver is configured to transceive data. The processor is configured to implement the method in any one of the first aspect to the thirteenth aspect.

[0104] In an eighteenth aspect, the present application provides a communication device, which includes a processor and an interface. The interface is configured to receive or output signals. The processor is configured to implement the method in any one of the first aspect to the thirteenth aspect by a logic circuit or executing code instructions.

[0105] In a nineteenth aspect, the present application provides a computer readable storage medium, which stores a computer program or instructions. When the computer program or instructions are executed by a communication device, the method in any one of the first aspect to the thirteenth aspect is implemented.

[0106] In a twentieth aspect, the present application provides a computer program product comprising instructions which, when executed by a computer, cause the computer to perform the method of any one of the first aspect to the thirteenth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0107] Figure 1 A flowchart of an existing cell handover method provided by the present application;

[0108] Figure 2 A flowchart of an existing random access method provided by the present application;

[0109] Figure 3 A schematic diagram of a system architecture provided by the present application;

[0110] Figure 4 A flowchart of an information transmission method provided by the present application;

[0111] Figure 5 A flowchart of an information transmission method provided by the present application;

[0112] Figure 6 A flowchart of an information transmission method provided by the present application;

[0113] Figure 7 A flowchart of an information transmission method provided by the present application;

[0114] Figure 8 A flowchart of an information transmission method provided by the present application;

[0115] Figure 9 A flowchart of an information transmission method provided by the present application;

[0116] Figure 10 A flowchart of an information transmission method provided by the present application;

[0117] Figure 11 A flowchart of an information transmission method provided by the present application;

[0118] Figure 12 A flowchart of a UE group determination method provided by the present application;

[0119] Figure 13 A structural schematic diagram of a communication device provided by the present application;

[0120] Figure 14 A structural schematic diagram of a communication device provided by the present application;

[0121] Figure 15 A structural schematic diagram of a chip provided by the present application. Detailed Implementation

[0122] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0123] The terms "first" and "second," etc., used in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0124] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0125] In this application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three or more, and "and / or" is used to describe the relationship between related objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0126] To better understand the embodiments of this application, the system architecture involved in the embodiments of this application will be described first below:

[0127] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) system or a new radio (NR), and a future communication system, etc.

[0128] Please refer to Figure 3 , Figure 3 is a schematic diagram of a system architecture provided by the embodiments of the present application. As shown in Figure 3 , the system architecture includes a UE group, a source access network device and a target access network device.

[0129] The UE group, the source access network device and the target access network device involved in the system architecture will be introduced respectively as follows. Figure 3

[0130] I. Source access network device

[0131] The source access network device is an access network device in a serving cell of the UE group.

[0132] The interface between the access network device and the terminal device can be a Uu interface (or referred to as an air interface). Of course, in future communications, the names of these interfaces can remain unchanged, or can be replaced by other names, which are not limited by the present application.

[0133] ​The access network device is a node or device that accesses the terminal device to the wireless network. The access network device can be any kind of device with wireless transceiver function, including but not limited to: evolved Node B (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, base station (gNodeB or gNB) or transmission reception point (Transmission Reception Point, TRP) in NR, base station of subsequent evolution of 3GPP, access node in WiFi system, wireless relay node, wireless backhaul node, etc. The base station can be: macro base station, micro base station, pico base station, small station, relay station, or balloon station, etc. Multiple base stations can support the network of the same technology mentioned above, or support the network of different technologies mentioned above. The base station can contain one or more co-sited or non-co-sited TRPs. The access network device can also be a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN) scenario, a central unit (Central Unit, CU), and / or a distributed unit (Distributed Unit, DU). The access network device can also be a server, a wearable device, or a vehicle-mounted device, etc. The following takes the base station as an example to illustrate. The multiple access network devices can be the same type of base station, or different types of base stations. The base station can communicate with the terminal device, or communicate with the terminal device through the relay station. The terminal device can communicate with multiple base stations of different technologies, for example, the terminal device can communicate with the base station supporting LTE network, and can also communicate with the base station supporting 5G network, and can also support dual connection with the base station of LTE network and the base station of 5G network.

[0134] II. Target access network device

[0135] The target access network device is the access network device in the cell that the UE group wants to access when the neighbor cell signal is higher than the first threshold or the serving cell signal is lower than the second threshold and the neighbor cell signal is higher than the third threshold. For the description of the access network device, please refer to the description of the access network device under the source access network device, which is not repeated here.

[0136] III. UE group

[0137] The UE group includes multiple UEs. Cell switching can be performed in units of the UE group, that is, the source access network device can regard multiple UEs as one "group", make a cell switching decision in units of the group, and request the target access network device to perform cell switching in units of the group when cell switching is needed. After the source access network device sends a group switching request to the target access network device, the target access network device prepares resources for all UEs in the UE group. Among them, one UE in the UE group is a group head UE, and the other UEs are non-group head UEs.

[0138] After the source access network device sends a switching command for cell switching to all UEs in the UE group, the group head UE needs to send msg1 (message 1) to the target access network device and receive msg2 sent by the target access network device, which contains the TA information of the group head UE and the uplink resource allocation information of all UEs. The non-group head UEs do not need to send msg1 and can directly receive the msg2. That is, the group head UE needs to perform random access, and the non-group head UEs do not need to perform random access.

[0139] The UE includes a device that provides voice and / or data connectivity for a user, for example, the UE is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); also can be deployed in the air (such as airplanes, balloons and satellites, etc.). The terminal can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) UE, an augmented reality (AR) UE, a wireless terminal in industrial control, a vehicle-mounted UE, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a wearable UE, etc. The embodiments of the present application do not limit the application scenarios. The UE can also be referred to as a terminal, an access UE, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote UE, a mobile device, a terminal device, a wireless communication device, a UE agent or a UE apparatus, etc. The terminal can also be fixed or mobile. Hereinafter in the present application, UE refers to UE.

[0140] In order to enable the non-group header UE to accurately receive the TA information of the group header UE and the uplink resource allocation information of the non-group header UE, an information transmission method and a communication apparatus are provided in the embodiments of the present application. The information transmission method and the communication apparatus provided in the embodiments of the present application are further described below:

[0141] Please refer to Figure 4 , Figure 4 is a flowchart of an information transmission method provided in the embodiments of the present application. In the Figure 4 described method, the non-group header UE can obtain the first RA-RNTI and the first beam for transmitting msg2, so that the non-group header UE can obtain the scheduling information of msg2 based on the first RA-RNTI for analyzing the first PDCCH, and then receive msg2 based on the scheduling information of msg2 and the first beam. The msg2 includes the TA information of the group header UE and the uplink resource allocation information of the non-group header UE. Figure 4 In the embodiments of the present application, the group header UE, the non-group header UE, the source access network device and the target access network device are taken as an example of the execution subject of the method. For example, Figure 4 The group header UE, the non-group header UE, the source access network device or the target access network device in the embodiments of the present application can also be a chip, a chip system or a processor supporting the group header UE, the non-group header UE, the source access network device or the target access network device to implement the method, and can also be a logical module or software capable of implementing all or part of the functions of the group header UE, the non-group header UE, the source access network device or the target access network device. Wherein:

[0142] 401. The group header UE sends msg1 to the target access network device by using the first beam. Correspondingly, the target access network device can receive the msg1 sent by the group header UE by using the first beam.

[0143] The msg1 includes a preamble. The msg1 is used for random access.

[0144] Optionally, the UE can select an SSB with a signal quality higher than a threshold value, and the first beam can be a beam corresponding to the selected SSB. The beam corresponding to the SSB refers to the beam for transmitting the SSB. The SSB has a corresponding relationship between the identifier and the beam for transmitting the SSB.

[0145] 402. The target access network device sends first information to the source access network device. Correspondingly, the source access network device can receive the first information.

[0146] The first information is used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI is used to scramble a first physical downlink control channel (PDCCH) used to carry scheduling information of msg2, the msg2 includes time advance (TA) information of the group header UE and uplink resource allocation information of all UEs in the UE group. The scheduling information of msg2 can be time-frequency resource information of msg2.

[0147] Since the scheduling information of msg2 is carried in the first PDCCH, and the target access network device sends msg2 by using the first beam. Therefore, in order for the non-group header UE to receive msg2, the non-group header UE needs to know the first RA-RNTI and the first beam, so as to parse the first PDCCH based on the first RA-RNTI to obtain the scheduling information of msg2, and receive msg2 based on the scheduling information of msg2 and the first beam.

[0148] Therefore, in order to enable the non-group header UE to successfully receive msg2, the target access network device does not immediately send the first PDCCH and msg2 after receiving msg1. Instead, the target access network device first sends the first information to the source access network device, so that the source access network device can send the first information to the non-group header UE. In this way, the non-group header UE can determine the first RA-RNTI and the first beam based on the first information. The target access network device sends the first PDCCH and msg2 after sending the first information to the source access network device. In this way, the non-group header UE can determine the first RA-RNTI and the first beam, and then parse the first PDCCH based on the first RA-RNTI to obtain the scheduling information of msg2, and receive msg2 based on the scheduling information of msg2 and the first beam.

[0149] 403、The source access network device sends the first information to the non-group header UE. Accordingly, the non-group header UE can receive the first information.

[0150] In a possible implementation, the source access network device can send the first information to the non-group header UE in one of the following two ways.

[0151] Method one: The source access network device sends the first information to the non-group header UE in the UE group through a radio resource control (RRC) message. Accordingly, the non-group header UE in the UE group receives the first information sent by the source access network device through the RRC message.

[0152] The second PDCCH is scrambled by a group radio network temporary identifier (G-RNTI) of the UE group, and is used to carry scheduling information of the first information. The source access network device broadcasts the first information. Accordingly, the non-group header UE in the UE group can receive the second PDCCH broadcast by the source access network device, the second PDCCH being scrambled by the G-RNTI of the UE group and being used to carry the scheduling information of the first information. The non-group header UE can receive the first information broadcast by the source access network device based on the scheduling information of the first information.

[0153] Each cell group corresponds to a G-RNTI, and the G-RNTI is used to distinguish the cell groups. Therefore, the second PDCCH can be scrambled by the G-RNTI, so that only the UEs in the cell group corresponding to the G-RNTI can successfully descramble the second PDCCH to obtain the scheduling information of the first information. Further, the non-group header UE in the cell group corresponding to the G-RNTI can receive the first information broadcast by the source access network device based on the scheduling information of the first information.

[0154] 404. The non-group header UE determines the first RA-RNTI and the first beam based on the first information.

[0155] In the embodiments of the present application, after receiving the first information, the non-group header UE determines the first RA-RNTI and the first beam based on the first information.

[0156] In a possible implementation, the first information indicates one or more of the following information: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal and PBCH block (SSB) corresponding to the first beam. Based on the possible implementation, it is beneficial to accurately determine the first RA-RNTI and the first beam by the non-group header UE.

[0157] The non-group header UE can determine the first RA-RNTI based on any one of the following parameters: the first RA-RNTI, the PRACH resource, the preamble, the identifier of the first beam, and the identifier of the SSB corresponding to the first beam.

[0158] For example, it is assumed that the first information indicates the PRACH resource corresponding to the preamble. The non-group header UE can calculate the first RA-RNTI based on the PRACH resource.

[0159] Assume that the first information indicates the preamble. Since there is a corresponding relationship between the PRACH resource, the preamble, the first beam, and the identity of the SSB, the non-group header UE can determine the PRACH resource based on the preamble, and then calculate the first RA-RNTI based on the PRACH resource.

[0160] Assume that the first information indicates the identity of the first beam. Since there is a corresponding relationship between the PRACH resource, the preamble, the first beam, and the identity of the SSB, the non-group header UE can determine the PRACH resource based on the identity of the first beam, and then calculate the first RA-RNTI based on the PRACH resource.

[0161] Assume that the first information indicates the identity of the SSB. Since there is a corresponding relationship between the PRACH resource, the preamble, the first beam, and the identity of the SSB, the non-group header UE can determine the PRACH resource based on the identity of the SSB, and then calculate the first RA-RNTI based on the PRACH resource.

[0162] Since there is a corresponding relationship between the PRACH resource, the preamble, the first beam, and the identity of the SSB, the non-group header UE can determine the first beam based on any one of the PRACH resource, the preamble, the identity of the first beam, or the identity of the SSB corresponding to the first beam.

[0163] 405、The target access network device broadcasts the first PDCCH scrambled by the first RA-RNTI. Accordingly, the group header UE and the non-group header UE can receive the first PDCCH scrambled by the first RA-RNTI broadcast by the target access network device.

[0164] In the embodiment of the application, the target access network device can calculate the first RA-RNTI based on the PRACH resource. After the target access network device sends the first information to the source access network device, the target access network device broadcasts the first PDCCH scrambled by the first RA-RNTI.

[0165] 406、The non-group header UE descrambles the first PDCCH based on the first RA-RNTI to obtain the scheduling information of msg2.

[0166] In the embodiment of the application, after the non-group header UE receives the first PDCCH, the non-group header UE descrambles the first PDCCH based on the first RA-RNTI to obtain the scheduling information of msg2, so that the non-group header UE can subsequently receive msg2 based on the scheduling information of msg2.

[0167] Similarly, after receiving the first PDCCH, the group header UE can also descramble the first PDCCH based on the first RA-RNTI to obtain the scheduling information of msg2, so that the group header UE can subsequently receive msg2 based on the scheduling information of msg2. The group header UE can determine the first RA-RNTI based on the PRACH resource in advance.

[0168] 407、The target access network device broadcasts msg2 through the first beam. Accordingly, the group header UE and the non-group header UE can receive the msg2 broadcast by the target access network device through the first beam based on the scheduling information of msg2 in the first PDCCH.

[0169] It can be seen that, based on the method described above, the non-group header UE can obtain the first RA-RNTI and the first beam for transmitting msg2, so that the non-group header UE can obtain the scheduling information of msg2 by analyzing the first PDCCH based on the first RA-RNTI, and then receive msg2 based on the scheduling information of msg2 and the first beam. Figure 4 Therefore, based on the method described above, the non-group header UE can accurately receive the TA information of the group header UE and the uplink resource allocation information of the non-group header UE. Figure 4 Therefore, based on the method described above, the non-group header UE can accurately receive the TA information of the group header UE and the uplink resource allocation information of the non-group header UE.

[0170] Please refer to Figure 5 , Figure 5 is a flow diagram of another information transmission method provided by an embodiment of the present application. Figure 5 The described embodiment is an improvement on the embodiment described above. Figure 4 The described embodiment is an improvement on the embodiment described above. Figure 5 In the described embodiment, the target access network device will not send the first PDCCH and msg2 until the source access network device informs the target access network device that the target access network device can send the first PDCCH and msg2, thereby avoiding the target access network device from sending the first PDCCH and msg2 too early, which would cause the non-group header UE to fail to successfully receive the first PDCCH and msg2. Figure 5 The group header UE, the non-group header UE, the source access network device, and the target access network device in the above embodiment are taken as an example of the execution subject of the method, and the present application does not limit the execution subject of the method. For example, Figure 5 The group header UE, the non-group header UE, the source access network device, or the target access network device in the above embodiment can also be a chip, a chip system, or a processor that supports the group header UE, the non-group header UE, the source access network device, or the target access network device to implement the method, and can also be a logical module or software that can implement all or part of the functions of the group header UE, the non-group header UE, the source access network device, or the target access network device. Wherein:

[0171] 501、The group header UE sends msg1 to the target access network device by using a first beam. Accordingly, the target access network device can receive the msg1 sent by the group header UE by using the first beam.

[0172] The msg1 comprises a preamble. The msg1 is used for random access.

[0173] 502、The target access network device sends first information to the source access network device. Accordingly, the source access network device can receive the first information.

[0174] The first information is used for determining a first random access radio network temporary identifier (RA-RNTI) and a first beam. The first RA-RNTI is used for scrambling a first physical downlink control channel (PDCCH). The first PDCCH is used for carrying scheduling information of msg2. The msg2 comprises time advance (TA) information of the group header UE and uplink resource allocation information of all UEs in the UE group.

[0175] 503、The source access network device sends the first information to the non-group header UE. Accordingly, the non-group header UE can receive the first information.

[0176] The description of steps 501-503 can be referred to the description of the embodiments described in the specification, which will not be repeated here. Figure 4 The description of the embodiments described in the specification, which will not be repeated here.

[0177] 504、The source access network device starts a timer.

[0178] In the embodiments of the present application, after the source access network device sends the first information to the non-group header UE, the timer is started.

[0179] 505、The non-group header UE determines the first RA-RNTI and the first beam based on the first information.

[0180] The description of step 505 can be referred to the description of the embodiments described in the specification, which will not be repeated here. Figure 4 The description of the embodiments described in the specification, which will not be repeated here.

[0181] 506、The non-group header UE sends third information to the source access network device. The third information indicates that the non-group header UE has received the first information. Accordingly, the source access network device can receive the third information.

[0182] In the embodiments of the present application, after the non-group header UE receives the first information, the non-group header UE sends the third information to the source access network device. The step 505 can be performed first, and then the step 506 can be performed, or the step 506 can be performed first, and then the step 505 can be performed.

[0183] 507、When the timer expires or the source access network device receives the third information sent by all non-group header UEs, the source access network device sends the second information to the target access network device, where the second information indicates sending the first PDCCH and the msg2. Accordingly, the target access network device can receive the second information.

[0184] In a possible implementation, step 504 can also be performed, and step 506 is not performed. When the timer expires, the source access network device sends the second information to the target access network device, where the second information indicates sending the first PDCCH and the msg2.

[0185] In a possible implementation, step 506 can also be performed, and step 504 is not performed. When the source access network device receives the third information sent by all non-group header UEs, the source access network device sends the second information to the target access network device. Figure 5 For example, both step 504 and step 506 are performed.

[0186] In the embodiment of the application, after the target access network device receives the second information, step 508 is performed.

[0187] 508、The target access network device broadcasts the first PDCCH scrambled by the first RA-RNTI. Accordingly, the group header UE and the non-group header UE can receive the first PDCCH broadcast by the target access network device and scrambled by the first RA-RNTI.

[0188] 509、The non-group header UE descrambles the first PDCCH based on the first RA-RNTI to obtain the scheduling information of the msg2.

[0189] 510、The target access network device broadcasts the msg2 through the first beam. Accordingly, the group header UE and the non-group header UE can receive the msg2 broadcast by the target access network device through the first beam based on the scheduling information of the msg2 in the first PDCCH.

[0190] For details of steps 508-510, refer to Figure 4 The descriptions in the described embodiments are not repeated here.

[0191] It can be seen that, based on Figure 5 the described method, it is beneficial to avoid the target access network device from sending the first PDCCH and the msg2 too early, which causes the non-group header UE to fail to successfully receive the first PDCCH and the msg2.

[0192] For details, refer to Figure 6 , Figure 6 is a flowchart of an information transmission method provided by an embodiment of the application. Figure 6 The described embodiment is an improvement on Figure 5 the described embodiment.Figure 6 In the described embodiment, the source access network device can inform which UE is the group header UE and which UE is the non-group header UE, so that the group header UE and the non-group header UE perform corresponding operations. Figure 6 The group header UE, the non-group header UE, the source access network device and the target access network device in the method are taken as an example, and the application does not limit the execution subject of the method. For example, Figure 6 The group header UE, the non-group header UE, the source access network device or the target access network device in the method can also be a chip, a chip system or a processor supporting the group header UE, the non-group header UE, the source access network device or the target access network device to implement the method, and can also be a logical module or software capable of implementing all or part of the functions of the group header UE, the non-group header UE, the source access network device or the target access network device. Wherein:

[0193] 601, the source access network device sends a group switching request to the target access network device. Correspondingly, the target access network device can receive the group switching request.

[0194] The group switching request is used to request cell switching for the UE group, and the identity of the group header UE is carried in the group switching request. That is, the group switching request can indicate to the target access network device which UE is the group header UE.

[0195] Optionally, the identity of the group header UE can be a cell radio network temporary identifier (C-RNTI) of the group header UE. Alternatively, the identity of the group header UE can also be other information that can represent the group header UE.

[0196] By indicating the group header UE to the target access network device, the target access network device can identify whether the msg1 is sent by the group header UE after receiving the msg1. If the msg1 is sent by the group header UE, the target access network device sends the first information to the source access network device.

[0197] 602, the target access network device sends switching confirmation information to the source access network device. Correspondingly, the source access network device can receive the switching confirmation information.

[0198] 603, the source access network device sends a first command to the group header UE. Correspondingly, the group header UE can receive the first command.

[0199] 604, the source access network device sends a second command to the non-group header UE. Correspondingly, the non-group header UE can receive the second command.

[0200] In one possible implementation, the identity of the group header UE is carried in the first command and the second command. Optionally, the first command and the second command can be the same.

[0201] In another possible implementation, the first command carries information indicating that the UE receiving the first command is a group head UE, and the second command carries information indicating that the UE receiving the second command is a non-group head UE. Optionally, the first command and the second command can have the same name, and both carry the first information element. The first information element in the first command indicates that the UE receiving the first command is a non-group head UE. The first information element in the second command indicates that the UE receiving the second command is a non-group head UE. The first information element in the first command and the first information element in the second command have different values. For example, the first information element in the first command has a value of 1, and the first information element in the second command has a value of 0. Alternatively, the first information element in the first command has a value of 0, and the first information element in the second command has a value of 1.

[0202] In yet another possible implementation, the first command and the second command have different names, the first command indicates that the UE receiving the first command is a group head UE, and the second command indicates that the UE receiving the second command is a non-group head UE. That is, by sending different commands with different names to different types of UEs, it is indicated whether the UE receiving the command is a group head UE.

[0203] In a possible implementation, the first command and the second command indicate cell switching. That is, the first command and the second command can be switching commands. Based on this possible implementation, the first command and the second command are used for both cell switching and indicating non-group head UEs, which can avoid increasing additional signaling and save signaling overhead.

[0204] In another possible implementation, the first command and the second command can also not be switching commands.

[0205] In a possible implementation, the second command also carries a group radio network temporary identifier (G-RNTI) of the UE group. Based on this possible implementation, the G-RNTI of the UE group can be indicated by the second command, so that subsequent TA information of the group head UEs and uplink resource allocation information of the non-group head UEs in the UE group can be received based on the G-RNTI.

[0206] 605、The group head UE sends msg1 to the target access network device using the first beam. Accordingly, the target access network device can receive the msg1 sent by the group head UE using the first beam.

[0207] The msg1 includes a preamble. The msg1 is used for random access.

[0208] 606、The target access network device sends first information to the source access network device. Accordingly, the source access network device can receive the first information.

[0209] The first information is used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI is used to scramble a first physical downlink control channel (PDCCH), the first PDCCH is used to carry scheduling information of msg2, the msg2 includes time advance (TA) information of the group header UE and uplink resource allocation information of all UEs in the UE group.

[0210] 607、The source access network device sends the first information to the non-group header UE. Accordingly, the non-group header UE can receive the first information.

[0211] 608、The source access network device starts a timer.

[0212] 609、The non-group header UE determines the first RA-RNTI and the first beam based on the first information.

[0213] In the embodiments of the present application, after the non-group header UE receives the first information, the non-group header UE determines the first RA-RNTI and the first beam based on the first information.

[0214] 610、The non-group header UE sends third information to the source access network device, the third information indicates that the non-group header UE has received the first information. Accordingly, the source access network device can receive the third information.

[0215] In the embodiments of the present application, after the non-group header UE receives the first information, the non-group header UE sends the third information to the source access network device.

[0216] 611、When the timer expires or the third information sent by all non-group header UEs is received, the source access network device sends second information to the target access network device, the second information indicates that the first PDCCH and the msg2 are sent. Accordingly, the target access network device can receive the second information. After the target access network device receives the second information, step 612 is performed.

[0217] 612、The target access network device broadcasts the first PDCCH scrambled by the first RA-RNTI. Accordingly, the group header UE and the non-group header UE can receive the first PDCCH scrambled by the first RA-RNTI broadcast by the target access network device.

[0218] 613、The non-group header UE descrambles the first PDCCH based on the first RA-RNTI to obtain the scheduling information of the msg2.

[0219] 614、The target access network device broadcasts the msg2 through the first beam. Accordingly, the group header UE and the non-group header UE can receive the msg2 broadcast by the target access network device through the first beam based on the scheduling information of the msg2 in the first PDCCH.

[0220] For a description of steps 605 to 614, please refer to [link to relevant documentation]. Figure 4 and Figure 5 The descriptions of the embodiments are omitted here.

[0221] In one possible implementation, Figure 6 Steps 608, 610, and 611 can also be omitted. Figure 6 Take steps 608, 610, and 611 as an example.

[0222] It can be seen that based on Figure 6 The described method can accurately notify which UE is the group head UE through the first and second commands, so that the group head UE and non-group head UEs can perform the corresponding operations.

[0223] Please see Figure 7 , Figure 7 This is a flowchart illustrating another information transmission method provided in an embodiment of this application. Figure 7 The described method is with Figure 4 The described methods are parallel schemes. In Figure 7 In this process, the target access network device can broadcast the TA information of the group leader UE and the uplink resource allocation information of all non-group leader UEs in the UE group based on G-RNTI. Non-group leader UEs can then receive the TA information of the group leader UE and the uplink resource allocation information of all non-group leader UEs in the UE group based on G-RNTI. Figure 7 Taking the header UE, non-header UE, source access network device, and target access network device as examples of the execution subjects of this method, this application does not limit the execution subjects of this method. For example, Figure 7 The header UE, non-header UE, source access network device, or target access network device in the above can also be a chip, chip system, or processor that supports the implementation of this method by the header UE, non-header UE, source access network device, or target access network device. It can also be a logic module or software capable of implementing all or part of the functions of the header UE, non-header UE, source access network device, or target access network device. Wherein:

[0224] 701. The group leader UE sends msg1 to the target access network device using the first beam. Correspondingly, the target access network device can use the first beam to receive the msg1 sent by the group leader UE.

[0225] The explanation of step 701 can be found in the explanation of step 401, and will not be repeated here.

[0226] 702. The target access network device broadcasts msg2 via the first beam. Accordingly, the group leader UE can receive msg2 using the first beam based on the scheduling information in msg2.

[0227] In this embodiment, after receiving msg1, the target access network device can also broadcast a second PDCCH, which carries scheduling information for msg2. After broadcasting the second PDCCH, the target access network device broadcasts msg2 through the first beam.

[0228] 703. The target access network device broadcasts the first PDCCH. Accordingly, non-header UEs can receive this first PDCCH.

[0229] The first PDCCH is scrambled by the G-RNTI of the UE group and is used to carry scheduling information of the first information. The first information includes the TA information of the group head UE and the uplink resource allocation information of all non-group head UEs in the UE group.

[0230] Each cell group corresponds to a G-RNTI, which is used to distinguish cell groups. Therefore, the first PDCCH can be scrambled using the G-RNTI, so that only UEs in the cell group corresponding to the G-RNTI can successfully descramble the first PDCCH and obtain the scheduling information of the first information. Then, non-header UEs in the cell group corresponding to the G-RNTI can receive the first information broadcast by the target access network device based on the scheduling information of the first information.

[0231] 704. The non-header UE descrambles the first PDCCH based on G-RNTI to obtain the scheduling information of the first information.

[0232] In this embodiment of the application, after the non-header UE receives the first PDCCH, it descrambles the first PDCCH based on G-RNTI to obtain the scheduling information of the first information, so that the first information can be received subsequently based on the scheduling information of the first information.

[0233] 705. The target access network device broadcasts first information. Accordingly, the non-header UE receives the first information broadcast by the target access network device based on the scheduling information of the first information in the first PDCCH.

[0234] It can be seen that, based on Figure 7 The described method allows the target access network device to broadcast the TA information of the group leader UE and the uplink resource allocation information of all non-group leader UEs in the UE group based on G-RNTI. Non-group leader UEs can then receive the TA information of the group leader UE and the uplink resource allocation information of all non-group leader UEs in the UE group based on G-RNTI. Therefore, based on... Figure 7 The described method facilitates the accurate reception of TA information from the group head UE and uplink resource allocation information from the non-group head UE.

[0235] Please see Figure 8 , Figure 8FIG. 1 is a flowchart of an information transmission method according to an embodiment of the present application. Figure 8 The described embodiments are improvements to Figure 7 The described embodiments are improvements to Figure 6 In the described embodiments, the source access network device can inform which UE is a group header UE and which UE is a non-group header UE, so that the group header UE and the non-group header UE perform corresponding operations. Figure 8 In the described embodiments, the source access network device can inform which UE is a group header UE and which UE is a non-group header UE, so that the group header UE and the non-group header UE perform corresponding operations. Figure 8 In the described embodiments, the source access network device can inform which UE is a group header UE and which UE is a non-group header UE, so that the group header UE and the non-group header UE perform corresponding operations.

[0236] 801. The source access network device sends a group handover request to the target access network device. Correspondingly, the target access network device can receive the group handover request.

[0237] The group handover request is used to request cell handover for a UE group, and the group handover request carries an identifier of a group header UE in the UE group and a G-RNTI of the UE group. That is, the group handover request can indicate to the target access network device which UE is the group header UE.

[0238] Optionally, the identifier of the group header UE can be a C-RNTI of the group header UE. Alternatively, the identifier of the group header UE can also be other information that can represent the group header UE.

[0239] By indicating the group header UE to the target access network device, the target access network device can identify whether msg1 is sent by the group header UE after receiving the msg1, and send first information to the source access network device only if the msg1 is sent by the group header UE.

[0240] By indicating the G-RNTI of the UE group to the target access network device, the target access network device can subsequently scramble the first PDCCH based on the G-RNTI.

[0241] 802. The target access network device sends handover confirmation information to the source access network device. Correspondingly, the source access network device can receive the handover confirmation information.

[0242] 803. The source access network device sends a first command to the group header UE. Correspondingly, the group header UE can receive the first command.

[0243] 804、The source access network device sends a second command to the non-group header UE. Accordingly, the non-group header UE can receive the second command.

[0244] The second command carries a G-RNTI of a UE group. The G-RNTI of the UE group is indicated by the second command, so that the first PDCCH can be descrambled based on the G-RNTI subsequently.

[0245] In a possible implementation, the first command and the second command both carry an identifier of the group header UE. Optionally, the first command and the second command can be the same.

[0246] In another possible implementation, the first command carries information indicating that the UE receiving the first command is a group header UE, and the second command carries information indicating that the UE receiving the second command is a non-group header UE. Optionally, the first command and the second command can have the same name, and both carry a first information element. The first information element in the first command is used to indicate that the UE receiving the first command is a non-group header UE. The first information element in the second command is used to indicate that the UE receiving the second command is a non-group header UE. The first information element in the first command and the first information element in the second command have different values. For example, the first information element in the first command has a value of 1, and the first information element in the second command has a value of 0. Alternatively, the first information element in the first command has a value of 0, and the first information element in the second command has a value of 1.

[0247] In yet another possible implementation, the first command and the second command have different names, the first command indicates information that the UE receiving the first command is a group header UE, and the second command indicates information that the UE receiving the second command is a non-group header UE. That is, by sending different types of commands to different types of UEs, it is indicated whether the UE receiving the command is a group header UE.

[0248] In a possible implementation, the first command and the second command indicate cell switching. That is, the first command and the second command can be switching commands. Based on this possible implementation, the first command and the second command are used for both cell switching and indicating non-group header UEs, which can avoid increasing additional signaling and save signaling overhead.

[0249] In another possible implementation, the first command and the second command can also not be switching commands.

[0250] 805、The group header UE sends msg1 to the target access network device using the first beam. Accordingly, the target access network device can receive the msg1 sent by the group header UE using the first beam.

[0251] 806、The target access network device broadcasts msg2 through the first beam. Accordingly, the group header UE can receive the msg2 using the first beam based on scheduling information of the msg2.

[0252] 807、The target access network device broadcasts the first PDCCH. Accordingly, the non-group header UE can receive the first PDCCH.

[0253] The first PDCCH is scrambled by a group mobile user temporary identity (G-RNTI) of the UE group, and the first PDCCH is used to carry scheduling information of the first information. The first information includes time advance (TA) information of the group header UE and uplink resource allocation information of all non-group header UEs in the UE group.

[0254] 808、The non-group header UE descrambles the first PDCCH based on the G-RNTI to obtain the scheduling information of the first information.

[0255] In the embodiments of the present application, after the non-group header UE receives the first PDCCH, the non-group header UE descrambles the first PDCCH based on the G-RNTI to obtain the scheduling information of the first information, so as to subsequently receive the first information based on the scheduling information of the first information in the first PDCCH.

[0256] 809、The target access network device broadcasts the first information. Accordingly, the non-group header UE receives the first information broadcast by the target access network device based on the scheduling information of the first information in the first PDCCH.

[0257] The description of steps 805-809 can be referred to Figure 7 The description of the embodiments is not repeated here.

[0258] It can be seen that based on Figure 8 The described method can accurately inform which UE is the group header UE through the first command and the second command, so that the group header UE and the non-group header UE can perform corresponding operations.

[0259] Please refer to Figure 9 , Figure 9 is a flowchart of an information transmission method provided by an embodiment of the present application. Figure 9 The described method is a parallel scheme of the methods described in Figure 4 and Figure 7 In Figure 9 , the target access network device can send the TA information of the group header UE and the uplink resource allocation information of all non-group header UEs to the source access network device, and the source access network device sends the TA information of the group header UE and the uplink resource allocation information of the non-group header UE to the non-group header UE. Figure 9 In the embodiments, the group header UE, the non-group header UE, the source access network device and the target access network device are taken as an example of the execution subject of the method, but the present application does not limit the execution subject of the method. For example, Figure 9The group header UE, the non-group header UE, the source access network device, or the target access network device in the method can also be a chip, a chip system, or a processor supporting the group header UE, the non-group header UE, the source access network device, or the target access network device to implement the method, and can also be a logical module or software capable of implementing all or part of the functions of the group header UE, the non-group header UE, the source access network device, or the target access network device. Wherein:

[0260] 901. The group header UE sends msg1 to the target access network device using a first beam. Accordingly, the target access network device can receive the msg1 sent by the group header UE using the first beam.

[0261] 902. The target access network device broadcasts msg2 using a first beam. Accordingly, the group header UE can receive msg2 using the first beam based on the scheduling information of msg2.

[0262] In the embodiments of the present application, after receiving msg1, the target access network device can also broadcast a second PDCCH, and the second PDCCH carries the scheduling information of msg2. After broadcasting the second PDCCH, the target access network device broadcasts msg2 through the first beam.

[0263] 903. The target access network device sends first information to the source access network device, and the first information includes TA information of the group header UE and uplink resource allocation information of all non-group header UEs in the UE group. Accordingly, the source access network device can receive the first information.

[0264] 904. The source access network device sends the TA information of the group header UE and the uplink resource allocation information of the non-group header UE to the non-group header UE. Accordingly, the non-group header UE can receive the TA information of the group header UE and the uplink resource allocation information of the non-group header UE sent by the source access network device.

[0265] In the embodiments of the present application, after receiving the first information, the source access network device sends the TA information of the group header UE and the uplink resource allocation information of the non-group header UE to the non-group header UE.

[0266] In a possible implementation, the source access network device can send the TA information of the group header UE and the uplink resource allocation information of the non-group header UE to the non-group header UE in one of the following two ways.

[0267] Method one: The source access network device sends the TA information of the group header UE and the uplink resource allocation information of the non-group header UE to the non-group header UE through an RRC message. Accordingly, the non-group header UE in the UE group receives the TA information of the group header UE and the uplink resource allocation information of the non-group header UE in the UE group sent by the source access network device through the RRC message.

[0268] The second mode is that the source access network device broadcasts a first PDCCH scrambled by a G-RNTI of the UE group, and the first PDCCH is used to carry scheduling information of the first information; and the source access network device broadcasts the first information. Correspondingly, the non-group head UE receives the first PDCCH broadcast by the source access network device; the non-group head UE descrambles the first PDCCH by using the G-RNTI to obtain the scheduling information of the first information; and the non-group head UE receives the first information broadcast by the source access network device based on the scheduling information of the first information in the first PDCCH.

[0269] Each cell group corresponds to a G-RNTI, and the G-RNTI is used to distinguish the cell groups. Therefore, the first PDCCH can be scrambled by the G-RNTI, so that only the UEs in the cell group corresponding to the G-RNTI can successfully descramble the first PDCCH to obtain the scheduling information of the first information. Further, the non-group head UE in the cell group corresponding to the G-RNTI can receive the first information broadcast by the source access network device based on the scheduling information of the first information.

[0270] It can be seen that, based on the method described above, Figure 9 the target access network device can send the TA information of the group head UE and the uplink resource allocation information of all the non-group head UEs to the source access network device, and the source access network device sends the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs. Therefore, based on the method described above, Figure 9 the non-group head UE can accurately receive the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs.

[0271] Please refer to Figure 10 , Figure 10 which is a flowchart of an information transmission method provided by an embodiment of the present application. Figure 10 The described embodiment is an improvement on the embodiment described above. Figure 9 The described embodiment is an improvement on the embodiment described above. Figure 9 In the described embodiment, the source access network device can inform which UE is the group head UE and which UEs are the non-group head UEs, so that the group head UE and the non-group head UE perform corresponding operations. Figure 10 In the method described above, the group head UE, the non-group head UE, the source access network device and the target access network device are taken as the execution subject of the method, but the present application does not limit the execution subject of the method. For example, Figure 10 The group head UE, the non-group head UE, the source access network device or the target access network device in the method described above can also be a chip, a chip system or a processor supporting the group head UE, the non-group head UE, the source access network device or the target access network device to implement the method, and can also be a logical module or software capable of implementing all or part of the functions of the group head UE, the non-group head UE, the source access network device or the target access network device. Wherein:

[0272] 1001. The source access network device sends a group handover request to the target access network device. Accordingly, the target access network device can receive the group handover request.

[0273] The group handover request is used to request cell handover for a UE group, and the group handover request carries an identifier of a group head UE in the UE group. That is, the group handover request can indicate to the target access network device which UE is the group head UE.

[0274] Optionally, the identifier of the group head UE can be a cell radio network temporary identifier (C-RNTI) of the group head UE. Alternatively, the identifier of the group head UE can also be other information that can represent the group head UE.

[0275] By indicating the group head UE to the target access network device, the target access network device can identify whether a received msg1 is sent by the group head UE after receiving the msg1. If the msg1 is sent by the group head UE, the target access network device sends first information to the source access network device.

[0276] 1002. The target access network device sends handover confirmation information to the source access network device. Accordingly, the source access network device can receive the handover confirmation information.

[0277] 1003. The source access network device sends a first command to the group head UE. Accordingly, the group head UE can receive the first command.

[0278] 1004. The source access network device sends a second command to the non-group head UE. Accordingly, the non-group head UE can receive the second command.

[0279] In a possible implementation, the first command and the second command both carry an identifier of the group head UE. Optionally, the first command and the second command can be the same.

[0280] In another possible implementation, the first command carries information indicating that a UE receiving the first command is the group head UE, and the second command carries information indicating that a UE receiving the second command is the non-group head UE. Optionally, the first command and the second command can have the same name, and both carry a first information element. The first information element in the first command is used to indicate that a UE receiving the first command is the non-group head UE. The first information element in the second command is used to indicate that a UE receiving the second command is the non-group head UE. The first information element in the first command and the first information element in the second command have different values. For example, the first information element in the first command has a value of 1, and the first information element in the second command has a value of 0. Alternatively, the first information element in the first command has a value of 0, and the first information element in the second command has a value of 1.

[0281] In yet another possible implementation, the signaling names of the first command and the second command are different, the first command indicates information that a UE receiving the first command is a group head UE, and the second command indicates information that a UE receiving the second command is a non-group head UE. That is, by sending commands with different names to different types of UEs, it is indicated whether the UE receiving the command is a group head UE.

[0282] In a possible implementation, the first command and the second command indicate cell switching. That is, the first command and the second command can be switching commands. Based on this possible implementation, the first command and the second command are used for both cell switching and indicating non-group head UEs, and additional signaling can be avoided, saving signaling overhead.

[0283] In another possible implementation, the first command and the second command can also not be switching commands.

[0284] In a possible implementation, the second command also carries a group mobile user temporary identifier (G-RNTI) of the UE group. Based on this possible implementation, the G-RNTI of the UE group can be indicated by the second command, so that subsequent TA information of group head UEs and uplink resource allocation information of non-group head UEs in the UE group can be received based on the G-RNTI.

[0285] 1005. The group head UE sends msg1 to the target access network device using the first beam. Accordingly, the target access network device can receive the msg1 sent by the group head UE using the first beam.

[0286] 1006. The target access network device broadcasts msg2 using the first beam. Accordingly, the group head UE can receive the msg2 using the first beam based on scheduling information of the msg2.

[0287] 1007. The target access network device sends first information to the source access network device, where the first information includes TA information of the group head UE and uplink resource allocation information of all non-group head UEs in the UE group. Accordingly, the source access network device can receive the first information.

[0288] 1008. The source access network device sends the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs. Accordingly, the non-group head UEs can receive the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs sent by the source access network device.

[0289] The description of steps 1005-1008 can be referred to Figure 9 The description in the described embodiments is not repeated here.

[0290] It can be seen that based on Figure 10The described method can accurately inform which UE is the group head UE through the first command and the second command, so that the group head UE and the non-group head UE can perform corresponding operations.

[0291] Please refer to Figure 11 , Figure 11 is a flowchart of an information transmission method provided by an embodiment of the present application. Figure 11 In the method, the group head UE, the non-group head UE, the source access network device, and the target access network device are taken as an example of an execution subject of the method, and the present application does not limit the execution subject of the method. For example, Figure 11 The group head UE, the non-group head UE, the source access network device, or the target access network device in the method can also be a chip, a chip system, or a processor that supports the group head UE, the non-group head UE, the source access network device, or the target access network device to implement the method, and can also be a logical module or software that can implement all or part of the functions of the group head UE, the non-group head UE, the source access network device, or the target access network device. Wherein:

[0292] 1101. The source access network device sends a first command to the group head UE in the UE group. Correspondingly, the group head UE can receive the first command.

[0293] 1102. The source access network device sends a second command to the non-group head UE in the UE group. Correspondingly, the non-group head UE can receive the second command.

[0294] In a possible implementation, the first command and the second command both carry the identifier of the group head UE. Optionally, the first command and the second command can be the same.

[0295] In another possible implementation, the first command carries information for indicating that the UE receiving the first command is the group head UE, and the second command carries information for indicating that the UE receiving the second command is the non-group head UE. Optionally, the first command and the second command can have the same name and both carry a first information element. The first information element in the first command is used to indicate that the UE receiving the first command is the non-group head UE. The first information element in the second command is used to indicate that the UE receiving the second command is the non-group head UE. The first information element in the first command and the first information element in the second command have different values. For example, the value of the first information element in the first command is 1, and the value of the first information element in the second command is 0. Or, the value of the first information element in the first command is 0, and the value of the first information element in the second command is 1.

[0296] In yet another possible implementation, the first command and the second command have different signaling names, the first command indicates information for indicating that the UE receiving the first command is the group head UE, and the second command indicates information for indicating that the UE receiving the second command is the non-group head UE. That is, by sending commands with different names to different types of UEs, it is indicated whether the UE receiving the command is the group head UE.

[0297] In a possible implementation, the first command and the second command indicate to perform cell switching. That is, the first command and the second command can be switching commands. Based on the possible implementation, the first command and the second command are used for both cell switching and indicating non-group head UEs, and additional signaling can be avoided, and signaling overhead can be saved.

[0298] In another possible implementation, the first command and the second command can also not be switching commands.

[0299] In a possible implementation, the second command also carries a group mobile user temporary identifier (G-RNTI) of the UE group. Based on the possible implementation, the G-RNTI of the UE group can be indicated by the second command, so that the TA information of the group head UE and the uplink resource allocation information of the non-group head UE in the UE group can be subsequently received based on the G-RNTI.

[0300] Based on Figure 11 The described method can accurately inform which UE is a group head UE by the first command, so that the group head UE can perform corresponding operations, and can accurately inform which UE is a non-group head UE by the second command, so that the non-group head UE can perform corresponding operations.

[0301] Please refer to Figure 12 , Figure 12 is a flowchart of a UE group determination method provided by an embodiment of the present application. Figure 12 In the method, the source access network device is taken as an example of an execution subject of the method, and the present application does not limit the execution subject of the method. For example, Figure 12 The source access network device in the method can also be a chip, a chip system, or a processor supporting the source access network device to implement the method, and can also be a logic module or software capable of implementing all or part of the functions of the source access network device. Wherein:

[0302] 1201. The source access network device receives measurement reports of multiple UEs.

[0303] Optionally, the measurement report can include a neighbor cell signal quality and / or a serving cell signal quality.

[0304] 1202. The source access network device determines multiple second UEs from the multiple UEs based on the measurement reports of the multiple UEs, the measurement report of the second UE indicating that the neighbor cell signal quality is higher than the serving cell signal quality by a first threshold, or the serving cell signal quality is lower than a second threshold and the neighbor cell signal quality is higher than a third threshold.

[0305] For example, the source access network device receives the measurement reports reported by UE1-UE5. The measurement reports corresponding to UE1-UE4 indicate that the signal quality of the neighboring cell is higher than the signal quality of the serving cell by more than a first threshold, or the signal quality of the serving cell is lower than a second threshold and the signal quality of the neighboring cell is higher than a third threshold. The measurement report corresponding to UE5 indicates that the signal quality of the neighboring cell is less than or equal to the signal quality of the serving cell by less than the first threshold, or the signal quality of the serving cell is greater than or equal to the second threshold and the signal quality of the neighboring cell is less than the third threshold. Then the second UEs include UE1-UE4.

[0306] 1203、The source access network device determines whether to divide the plurality of second UEs into a UE group based on the positions of the plurality of second UEs.

[0307] In an embodiment of the present application, after the source access network device determines the plurality of second UEs, the source access network device determines whether to divide the plurality of second UEs into a UE group based on the positions of the plurality of second UEs.

[0308] In a possible implementation, the source access network device can determine the position of a second UE based on the best beam and TA information corresponding to the second UE. Based on this possible implementation, the position of the second UE can be accurately determined.

[0309] In a possible implementation, the specific implementation in which the source access network device determines whether to divide the plurality of second UEs into a UE group based on the positions of the plurality of second UEs is as follows:

[0310] If the dispersion degree between the positions of the plurality of second UEs is less than or equal to a fourth threshold, the plurality of second UEs are divided into a UE group; if the dispersion degree between the positions of the plurality of second UEs is greater than the fourth threshold, the plurality of second UEs are not divided into a UE group.

[0311] If the dispersion degree between the positions of the plurality of second UEs is less than or equal to a fourth threshold, the plurality of second UEs are divided into a UE group; if the dispersion degree between the positions of the plurality of second UEs is greater than the fourth threshold, the plurality of second UEs are not divided into a UE group.

[0312] In a possible implementation, in a UE group, the position of the group head UE is closest to the center position of the UE group.

[0313] In Figure 12 In the described method, each UE reports a measurement report to the source access network device, and the source access network device divides the UE groups that need to perform cell switching based on the measurement reports reported by the plurality of UEs, and selects a group head UE. Figure 12 The method can be applied to a scenario in which the UEs of passengers on a vehicle (such as a bus or a subway) communicate with an access network device outside the vehicle.

[0314] Optionally, Figure 12 The method can also be applied to a scenario in which the UEs of passengers on a vehicle (such as a bus or a subway) communicate with an access network device outside the vehicle. Figures 4-11The described method is combined. That is Figures 4-11 The source access network device in Figure 12 may also perform the steps in

[0315] It can be seen that based on the described method Figure 12 The described method can accurately divide the UE group that needs to perform cell switching.

[0316] See Figure 13 , Figure 13 The structure of a communication device according to an embodiment of the application is shown. Figure 13 The communication device shown can be used to perform part or all of the functions of the non-group head UE in the above method embodiment. The device can be a non-group head UE, or a device in a non-group head UE, or a device that can be used with a non-group head UE. The communication device can also be a chip system. Figure 13 The communication device shown can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is used for data processing. The communication unit 1301 integrates a receiving unit and a sending unit. The communication unit 1301 can also be called a transceiver unit. Alternatively, the communication unit 1301 can also be split into a receiving unit and a sending unit. Wherein:

[0317] The communication unit 1301 is used to receive the first information sent by the source access network device, the first information being used to determine the first random access radio network temporary identifier (RA-RNTI) and the first beam, the first RA-RNTI being used to scramble the first physical downlink control channel (PDCCH), the first PDCCH being used to carry the scheduling information of message (msg) 2, the first beam being used to transmit msg1 and msg2, the msg1 including a preamble, and the msg2 including the time advance (TA) information of the group head UE within the UE group and the uplink resource allocation information of all UEs within the UE group;

[0318] The processing unit 1302 is used to determine the first RA-RNTI and the first beam based on the first information. The communication unit 1301 is also used to receive the first PDCCH scrambled by the first RA-RNTI broadcast by the target access network device. The processing unit 1302 is also used to descramble the first PDCCH based on the first RA-RNTI to obtain the scheduling information of msg2. The communication unit 1301 is also used to receive the msg2 broadcast by the target access network device through the first beam based on the scheduling information of msg2.

[0319] In a possible implementation, the communication unit 1301 receives the first information sent by the source access network device in the following manner: receiving the first information sent by the source access network device through a radio resource control (RRC) message.

[0320] In a possible implementation, the communication unit 1301 receives the first information sent by the source access network device in the following manner: receiving a second PDCCH broadcast by the source access network device, the second PDCCH being scrambled by a G-RNTI of the UE group, and the second PDCCH being used to carry scheduling information of the first information; descrambling the second PDCCH based on the G-RNTI of the UE group to obtain the scheduling information of the first information; and receiving the first information broadcast by the source access network device based on the scheduling information of the first information.

[0321] In a possible implementation, the communication unit 1301 is further configured to, after receiving the first information sent by the source access network device, send third information to the source access network device, where the third information indicates that the non-group head UE has received the first information.

[0322] In a possible implementation, the first information indicates one or more of the following information: the first RA-RNTI, a PRACH resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a SSB corresponding to the first beam.

[0323] In a possible implementation, the communication unit 1301 is further configured to, before receiving the first information sent by the source access network device, receive a second command sent by the source access network device, where the second command carries an identifier of the group head UE; or the second command carries information indicating that a UE receiving the second command is a non-group head UE; or the second command is different from a first command sent by the source access network device to the group head UE, the first command indicating that a UE receiving the first command is a group head UE, and the second command indicating that a UE receiving the second command is a non-group head UE.

[0324] In a possible implementation, the second command further carries a G-RNTI of the UE group.

[0325] In a possible implementation, the first command and the second command indicate a cell switching.

[0326] See Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown in the figure can be used to perform part or all of the functions of the source access network device in the above method embodiments. The apparatus can be a source access network device, or a device in the source access network device, or a device that can be used in matching with the source access network device. The communication apparatus can also be a chip system. Figure 13The illustrated communication device can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 includes a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. In this case:

[0327] The communication unit 1301 is configured to receive first information sent by a target access network device, the first information being used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI being used to scramble a first physical downlink control channel (PDCCH), the first PDCCH being used to carry scheduling information of a message (msg) 2, the first beam being used to transmit the msg1 and the msg2, the msg1 including a preamble, and the msg2 including time advance (TA) information of a group header UE in a UE group and uplink resource allocation information of all UEs in the UE group. The communication unit 1301 is further configured to send the first information to non-group header UEs in the UE group.

[0328] In a possible implementation, the communication unit 1301 sends the first information to the non-group header UEs in the UE group by means of a radio resource control (RRC) message.

[0329] In a possible implementation, the communication unit 1301 sends the first information to the non-group header UEs in the UE group by broadcasting a second PDCCH scrambled by a group mobile user temporary identifier (G-RNTI) of the UE group, and the second PDCCH is used to carry scheduling information of the first information; and broadcasts the first information.

[0330] In a possible implementation, the processing unit 1302 is configured to start a timer after the communication unit 1301 sends the first information to the non-group header UEs in the UE group. The communication unit 1301 is further configured to send second information to the target access network device when the timer expires, the second information indicating that the first PDCCH and the msg2 are sent.

[0331] In a possible implementation, the communication unit 1301 is further configured to send the second information to the target access network device when receiving third information sent by all non-group header UEs in the UE group after sending the first information to the non-group header UEs in the UE group, the second information indicating that the first PDCCH and the msg2 are sent, and the third information indicating that the non-group header UEs have received the first information.

[0332] In a possible implementation, the first information indicates one or more of the following: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam.

[0333] In a possible implementation, the communication unit 1301 is further configured to, before receiving the first information sent by the target access network device, perform the following steps: sending a group switching request to the target access network device, the group switching request being used to request cell switching for the UE group, and the group switching request carrying an identifier of the group head UE; receiving switching confirmation information sent by the target access network device; sending a first command to the group head UE; and sending a second command to the non-group head UE, wherein the first command and the second command both carry the identifier of the group head UE; or the first command carries information indicating that the UE receiving the first command is the group head UE, and the second command carries information indicating that the UE receiving the second command is the non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates information that the UE receiving the first command is the group head UE, and the second command indicates information that the UE receiving the second command is the non-group head UE.

[0334] In a possible implementation, the second command further carries a group radio network temporary identifier (G-RNTI) of the UE group.

[0335] In a possible implementation, the first command and the second command indicate cell switching.

[0336] See Figure 13 , Figure 13 A structural schematic diagram of a communication apparatus is shown. Figure 13 The communication apparatus shown can be used to perform part or all of the functions of the target access network device in the method embodiments. The apparatus can be the target access network device, or a device in the target access network device, or a device that can be used in matching with the target access network device. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 integrates a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. Wherein:

[0337] The communication unit 1301 is configured to receive a message (msg) 1 sent by a group head UE in a user equipment (UE) group using a first beam, wherein the msg1 includes a preamble;

[0338] The communication unit 1301 is further configured to send first information to the source access network device, the first information being used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI being used to scramble a first physical downlink control channel (PDCCH) used to carry scheduling information of msg2, the msg2 including time advance (TA) information of the group header UE and uplink resource allocation information of all UEs in the UE group; the communication unit 1301 is further configured to broadcast the first PDCCH scrambled by the first RA-RNTI; and the communication unit 1301 is further configured to broadcast the msg2 through the first beam.

[0339] In a possible implementation, the communication unit 1301 is further configured to, before sending the first PDCCH scrambled by the first RA-RNTI, receive second information sent by the source access network device, the second information indicating sending of the first PDCCH and the msg2.

[0340] In a possible implementation, the first information indicates one or more of the following information: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam.

[0341] In a possible implementation, the communication unit 1301 is further configured to, before receiving a message (msg) 1 sent by a group header UE in a user equipment (UE) group using the first beam, perform the following steps: receiving a group switching request sent by the source access network device, the group switching request being used to request cell switching of the UE group, and the group switching request carrying an identifier of the group header UE; and sending switching confirmation information to the source access network device.

[0342] Please refer to Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown can be configured to perform part or all of the functions of the non-group header UE in the method embodiments described above. The apparatus can be a non-group header UE, or a device in the non-group header UE, or a device that can be used with the non-group header UE. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 includes a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. In this case:

[0343] The communication unit 1301 is configured to receive a first PDCCH scrambled by a group radio network temporary identifier (G-RNTI) of a UE group broadcast by a target access network device, the first PDCCH being used to carry scheduling information of first information; and the processing unit is configured to descramble the first PDCCH based on the G-RNTI to obtain the scheduling information of the first information; and the communication unit 1301 is further configured to receive the first information broadcast by the target access network device based on the scheduling information of the first information, the first information including time advance (TA) information of a group head UE in the UE group and uplink resource allocation information of all non-group head UEs in the UE group.

[0344] In a possible implementation, the communication unit 1301 is further configured to receive a second command sent by the source access network device, the second command carrying the G-RNTI of the UE group; wherein the second command further carries an identifier of the group head UE; or the second command further carries information indicating that a UE receiving the second command is a non-group head UE; or the second command is different from a signaling name of a first command sent by the source access network device to the group head UE, the first command indicating that a UE receiving the first command is a group head UE, and the second command indicating that a UE receiving the second command is a non-group head UE.

[0345] In a possible implementation, the first command and the second command indicate cell switching.

[0346] Please refer to Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown in FIG. 1 can be configured to perform part or all of the functions of the target access network device in the method embodiments described above. The apparatus can be the target access network device, or a device in the target access network device, or a device capable of being used in combination with the target access network device. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown in FIG. 1 can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 is integrated with a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. Wherein:

[0347] The communication unit 1301 is configured to receive a message (msg) 1 transmitted by a group head UE in a user equipment (UE) group using a first beam, the msg1 comprising a preamble; the communication unit 1301 is further configured to broadcast a msg2 through the first beam; the communication unit 1301 is further configured to broadcast a first PDCCH scrambled by a group mobile user temporary identifier (G-RNTI) of the UE group, the first PDCCH being used to carry scheduling information of first information; and the communication unit 1301 is further configured to broadcast the first information, the first information comprising time advance (TA) information of the group head UE and uplink resource allocation information of all non-group head UEs in the UE group.

[0348] In a possible implementation, the communication unit 1301 is further configured to, before receiving the msg1 transmitted by the group head UE in the UE group using the first beam, perform the following steps: receiving a group switching request transmitted by a source access network device, the group switching request being used to request cell switching of the UE group, and the group switching request carrying an identifier of the group head UE and the G-RNTI of the UE group; and transmitting switching confirmation information to the source access network device.

[0349] Please refer to Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown in FIG. 1 can be configured to perform part or all of the functions of the source access network device in the above method embodiments. The apparatus can be the source access network device, or a device in the source access network device, or a device capable of being used with the source access network device. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown in FIG. 1 can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 is integrated with a receiving unit and a transmitting unit. The communication unit 1301 can also be referred to as a transceiving unit. Alternatively, the communication unit 1301 can be split into the receiving unit and the transmitting unit. In this case, the receiving unit is configured to receive information, and the transmitting unit is configured to transmit information.

[0350] The communication unit 1301 is configured to send a group switching request to a target access network device, the group switching request being used to request cell switching for a UE group, and the group switching request carrying an identifier of a group head UE in the UE group and a G-RNTI of the UE group; the communication unit 1301 is further configured to receive switching confirmation information sent by the target access network device; the communication unit 1301 is further configured to send a first command to the group head UE; the communication unit 1301 is further configured to send a second command to a non-group head UE, the second command carrying the G-RNTI of the UE group; wherein the first command and the second command further carry the identifier of the group head UE; or the first command further carries information indicating that a UE receiving the first command is the group head UE, and the second command further carries information indicating that a UE receiving the second command is the non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates that a UE receiving the first command is the group head UE, and the second command indicates that a UE receiving the second command is the non-group head UE.

[0351] In a possible implementation, the first command and the second command indicate cell switching.

[0352] Please refer to Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown in FIG. 1 can be configured to perform part or all of the functions of the non-group head UE in the method embodiments described above. The apparatus can be the non-group head UE, or a device in the non-group head UE, or a device capable of being used with the non-group head UE. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown in FIG. 1 can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 includes a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can also be split into the receiving unit and the sending unit. Wherein:

[0353] The communication unit 1301 is configured to receive TA information of a group head UE and uplink resource allocation information of a non-group head UE in a UE group sent by a source access network device.

[0354] In a possible implementation, the communication unit 1301 receives the TA information of the group head UE and the uplink resource allocation information of the non-group head UE in the UE group sent by the source access network device in the following manner: receiving the TA information of the group head UE and the uplink resource allocation information of the non-group head UE in the UE group sent by the source access network device through a radio resource control (RRC) message.

[0355] In a possible implementation, the communication unit 1301 receives the TA information of the group head UE and the uplink resource allocation information of the non-group head UE in the UE group sent by the source access network device in the following manner:

[0356] receiving a first PDCCH broadcast by the source access network device, the first PDCCH being scrambled by a group mobile user temporary identifier (G-RNTI) of the UE group, the first PDCCH being used to carry scheduling information of first information, the first information including time advance (TA) information of the group head UE in the UE group and uplink resource allocation information of all non-group head UEs in the UE group; descrambling the first PDCCH by using the G-RNTI to obtain the scheduling information of the first information; and receiving the first information broadcast by the source access network device based on the scheduling information of the first information.

[0357] In a possible implementation, the communication unit 1301 is further configured to receive a second command sent by the source access network device, wherein the second command carries an identifier of the group head UE; or the second command carries information indicating that a UE receiving the second command is a non-group head UE; or the second command has a signaling name different from that of a first command sent by the source access network device to the group head UE, the first command indicating that a UE receiving the first command is a group head UE, and the second command indicating that a UE receiving the second command is a non-group head UE.

[0358] In a possible implementation, the second command further carries a group mobile user temporary identifier (G-RNTI) of the UE group.

[0359] In a possible implementation, the first command and the second command indicate cell switching.

[0360] See Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown in FIG. 1 can be configured to perform part or all of the functions of the source access network device in the method embodiments described above. The apparatus can be the source access network device, or a device in the source access network device, or a device that can be used in conjunction with the source access network device. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown in FIG. 1 can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 includes a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. In this case, the receiving unit is configured to receive information, and the sending unit is configured to send information.

[0361] The communication unit 1301 is configured to receive first information sent by the target access network device, the first information comprising time advance (TA) information of a group head user equipment (UE) in a UE group and uplink resource allocation information of all non-group head UEs in the UE group; and the communication unit 1301 is further configured to send the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs.

[0362] In a possible implementation, the communication unit 1301 sends the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs in the following manner: sending the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs through a radio resource control (RRC) message.

[0363] In a possible implementation, the communication unit 1301 sends the TA information of the group head UE and the uplink resource allocation information of the non-group head UEs to the non-group head UEs in the following manner: broadcasting a first PDCCH scrambled by a group radio network temporary identifier (G-RNTI) of the UE group, the first PDCCH being used to carry scheduling information of the first information; and broadcasting the first information.

[0364] In a possible implementation, the communication unit 1301 is further configured to perform the following steps:

[0365] sending a group switching request to the target access network device, the group switching request being used to request cell switching of the UE group, and the group switching request carrying an identifier of the group head UE in the UE group; receiving switching confirmation information sent by the target access network device; sending a first command to the group head UE; and sending a second command to the non-group head UEs; wherein the first command and the second command carry the identifier of the group head UE; or the first command carries information indicating that a UE receiving the first command is the group head UE, and the second command carries information indicating that a UE receiving the second command is the non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates that a UE receiving the first command is the group head UE, and the second command indicates that a UE receiving the second command is the non-group head UE.

[0366] In a possible implementation, the second command further carries a group radio network temporary identifier (G-RNTI) of the UE group.

[0367] In a possible implementation, the first command and the second command indicate cell switching.

[0368] See Figure 13 , Figure 13 FIG. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13The communication device shown can be used to perform part or all of the functions of the target access network equipment in the above method embodiments. The device can be the target access network equipment, or a device in the target access network equipment, or a device that can be used in conjunction with the target access network equipment. Among them, the communication device can also be a chip system. Figure 13 The communication device shown can include a communication unit 1301 and a processing unit 1302. Among them, the processing unit 1302 is used for data processing. The communication unit 1301 is integrated with a receiving unit and a sending unit. The communication unit 1301 can also be called a transceiver unit. Alternatively, the communication unit 1301 can also be split into a receiving unit and a sending unit. Among them:

[0369] The communication unit 1301 is used to receive a message (msg) 1 sent by a group head UE in a user equipment (UE) group using a first beam, and the msg1 includes a preamble; the communication unit 1301 is also used to broadcast a msg2 using the first beam; the communication unit 1301 is also used to send first information to the source access network equipment, and the first information includes time advance (TA) information of the group head UE and uplink resource allocation information of all non-group head UEs in the UE group.

[0370] In a possible implementation, the communication unit 1301 is also used to perform the following steps before receiving the message (msg) 1 sent by the group head UE in the user equipment (UE) group using the first beam: receiving a group switching request sent by the source access network equipment, the group switching request is used to request cell switching for the UE group, and the group switching request carries an identifier of the group head UE; sending switching confirmation information to the source access network equipment.

[0371] Please refer to Figure 13 , Figure 13 The structure of a communication device according to an embodiment of the present application is shown. Figure 13 The communication device shown can be used to perform part or all of the functions of the source access network equipment in the above method embodiments. The device can be the source access network equipment, or a device in the source access network equipment, or a device that can be used in conjunction with the source access network equipment. Among them, the communication device can also be a chip system. Figure 13 The communication device shown can include a communication unit 1301 and a processing unit 1302. Among them, the processing unit 1302 is used for data processing. The communication unit 1301 is integrated with a receiving unit and a sending unit. The communication unit 1301 can also be called a transceiver unit. Alternatively, the communication unit 1301 can also be split into a receiving unit and a sending unit. Among them:

[0372] The communication unit 1301 is configured to send a first command to a group head UE in a UE group; and the communication unit 1301 is further configured to send a second command to the group head UE in the UE group; wherein the first command and the second command carry an identifier of the group head UE; or the first command carries information indicating that a UE receiving the first command is the group head UE, and the second command carries information indicating that a UE receiving the second command is a non-group head UE; or the first command and the second command have different signaling names, the first command indicates that a UE receiving the first command is the group head UE, and the second command indicates that a UE receiving the second command is the non-group head UE.

[0373] In a possible implementation, the second command further carries a group mobile user temporary identifier (G-RNTI) of the UE group.

[0374] In a possible implementation, the first command and the second command indicate cell switching.

[0375] See Figure 13 , Figure 13 The communication device shown in FIG. 1 is configured to implement the method embodiments described above. Figure 13 The communication device shown in FIG. 1 can be configured to implement part or all of the functions of the non-group head UE in the method embodiments described above. The device can be a non-group head UE, or a device in the non-group head UE, or a device that can be used with the non-group head UE. The communication device can also be a chip system. Figure 13 The communication device shown in FIG. 1 can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 includes a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. Wherein:

[0376] The communication unit 1301 is configured to receive a second command sent by a source access network device; wherein the second command carries an identifier of a group head UE; or the second command carries information indicating that a UE receiving the second command is a non-group head UE; or the second command has a different signaling name from a first command sent by the source access network device to the group head UE, the first command indicates that a UE receiving the first command is the group head UE, and the second command indicates that a UE receiving the second command is the non-group head UE.

[0377] In a possible implementation, the second command further carries a group mobile user temporary identifier (G-RNTI) of the UE group.

[0378] In a possible implementation, the first command and the second command indicate cell switching.

[0379] See Figure 13 ,Figure 13 Fig. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown can be used to perform part or all of the functions of the group header UE in the method embodiments described above. The apparatus can be a group header UE, or a device in the group header UE, or a device that can be used in conjunction with the group header UE. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 integrates a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. In this case:

[0380] The communication unit 1301 is configured to receive a first command sent by a source access network device. The first command carries an identifier of the group header UE. Alternatively, the first command carries information indicating that the UE receiving the first command is the group header UE. Alternatively, the signaling name of the first command is different from that of a second command sent by the source access network device to a non-group header UE. The first command indicates that the UE receiving the first command is the group header UE, and the second command indicates that the UE receiving the second command is the non-group header UE.

[0381] In a possible implementation, the first command and the second command indicate cell switching.

[0382] Please refer to Figure 13 , Figure 13 Fig. 1 shows a structural schematic diagram of a communication apparatus according to an embodiment of the present application. Figure 13 The communication apparatus shown can be used to perform part or all of the functions of the source access network device in the method embodiments described above. The apparatus can be a source access network device, or a device in the source access network device, or a device that can be used in conjunction with the source access network device. The communication apparatus can also be a chip system. Figure 13 The communication apparatus shown can include a communication unit 1301 and a processing unit 1302. The processing unit 1302 is configured to perform data processing. The communication unit 1301 integrates a receiving unit and a sending unit. The communication unit 1301 can also be referred to as a transceiver unit. Alternatively, the communication unit 1301 can be split into a receiving unit and a sending unit. In this case:

[0383] The communication unit 1301 is configured to receive measurement reports of a plurality of UEs; the processing unit 1302 is configured to determine a plurality of second UEs from the plurality of UEs based on the measurement reports of the plurality of user equipments (UEs), the second UEs corresponding to measurement reports indicating that a neighbor cell signal quality is higher than a serving cell signal quality by more than a first threshold, or a serving cell signal quality is lower than a second threshold and a neighbor cell signal quality is higher than a third threshold; and the processing unit 1302 is further configured to determine whether to divide the plurality of second UEs into a UE group based on locations of the plurality of second UEs.

[0384] In a possible implementation, the processing unit 1302 determines whether to divide the plurality of second UEs into a UE group based on the locations of the plurality of second UEs, including:

[0385] If a dispersion degree of the locations of the plurality of second UEs is less than or equal to a fourth threshold, the plurality of second UEs are divided into a UE group; and if the dispersion degree of the locations of the plurality of second UEs is greater than the fourth threshold, the plurality of second UEs are not divided into a UE group.

[0386] In a possible implementation, in the UE group, a group head UE is closest to a center location of the UE group.

[0387] In a possible implementation, the processing unit 1302 is further configured to determine the locations of the second UEs based on best beams and time advance (TA) information corresponding to the second UEs.

[0388] Figure 13 A structural diagram of a communication apparatus is given. The communication apparatus 1400 can be a group head UE, a non-group head UE, a source access network device, or a target access network device in the foregoing method embodiments, and can also be a chip, a chip system, or a processor, etc. that supports implementation of the group head UE, the non-group head UE, the source access network device, or the target access network device to implement the foregoing method. The communication apparatus can be used to implement the method described in the foregoing method embodiments, and details can be referred to the descriptions in the foregoing method embodiments.

[0389] The communication apparatus 1400 can include one or more processors 1401. The processor 1401 can be a general-purpose processor or a special-purpose processor, etc. For example, it can be a baseband processor or a central processing unit. The baseband processor can be configured to process a communication protocol and communication data, and the central processing unit can be configured to control the communication apparatus (such as a base station, a baseband chip, a terminal, a terminal chip, a DU, or a CU, etc.), execute a software program, and process data of the software program.

[0390] Optionally, the communication apparatus 1400 can include one or more memories 1402 that can store instructions 1404 that can be executed by the processor 1401 to cause the communication apparatus 1400 to perform the methods described in the above method embodiments. Optionally, the memory 1402 can also store data. The processor 1401 and the memory 1402 can be separately arranged, or can be integrated together.

[0391] Optionally, the communication apparatus 1400 can further include a transceiver 1405, an antenna 1406. The transceiver 1405 can be referred to as a transceiving unit, a transceiver, or a transceiving circuit, etc., and is configured to implement a transceiving function. The transceiver 1405 can include a receiver and a transmitter. The receiver can be referred to as a receiver or a receiving circuit, etc., and is configured to implement a receiving function. The transmitter can be referred to as a transmitter or a transmitting circuit, etc., and is configured to implement a transmitting function. Wherein, Figure 13 The processing unit 1302 shown can be the processor 1401. The communication unit 1301 can be the transceiver 1405.

[0392] In another possible design, the processor 1401 can include a transceiver for implementing receiving and transmitting functions. For example, the transceiver can be a transceiving circuit, or an interface, or an interface circuit. The transceiving circuit, the interface, or the interface circuit for implementing the receiving and transmitting functions can be separately arranged, or can be integrated together. The transceiving circuit, the interface, or the interface circuit described above can be configured to read and write code / data, or the transceiving circuit, the interface, or the interface circuit described above can be configured to transmit or transfer signals.

[0393] In yet another possible design, optionally, the processor 1401 can store instructions 1403. The instructions 1403, when executed by the processor 1401, can cause the communication apparatus 1400 to perform the methods described in the above method embodiments. The instructions 1403 can be fixed in the processor 1401. In this case, the processor 1401 can be implemented by hardware.

[0394] In yet another possible design, the communication device 1400 can include circuitry that can implement the functions of transmitting or receiving or communicating in the foregoing method embodiments. The processor and the transceiver described in embodiments of the present application can be implemented on an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFIC), a mixed-signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and the transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), positive channel metal oxide semiconductor (PMOS), Bipolar Junction Transistor (BJT), BiCMOS, silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0395] The communication device described in the foregoing embodiments can be a group header UE, a non-group header UE, a source access network device, or a target access network device, but the scope of the communication device described in embodiments of the present application is not limited thereto, and the structure of the communication device can not be limited by Figure 13 The communication device can be a standalone device or can be part of a larger device. For example, the communication device can be:

[0396] (1) a standalone integrated circuit (IC), or a chip, or a chip system or subsystem;

[0397] (2) a set of one or more ICs, optionally the set of ICs can also include storage components for storing data, instructions;

[0398] (3) an ASIC, such as a modem (MSM);

[0399] (4) a module that can be embedded in other devices;

[0400] (5) a receiver, a terminal, a smart terminal, a cellular phone, a wireless device, a handset, a mobile unit, a car-mounted device, a network device, a cloud device, an artificial intelligence device, etc.

[0401] (6) and others.

[0402] For the case that the communication device can be a chip or a chip system, refer to Figure 14 a structural diagram of the chip. Figure 13 Figure 14 Figure 15 Figure 15 The chip 1500 shown includes a processor 1501, an interface 1502. Optionally, it can also include a memory 1503. Among them, the number of processors 1501 can be one or more, and the number of interfaces 1502 can be multiple.

[0403] For the case that the chip is used to implement the functions of the group header UE, the non-group header UE, the source access network device or the target access network device in the embodiments of the present application:

[0404] The interface 1502 is configured to receive or output a signal.

[0405] The processor 1501 is configured to perform data processing operations of the group header UE, the non-group header UE, the source access network device or the target access network device.

[0406] It can be understood that some optional features in the embodiments of the present application can be implemented independently in some scenarios, without relying on other features, such as the scheme currently based on, to solve the corresponding technical problems and achieve the corresponding effects. Also, in some scenarios, they can be combined with other features according to needs. Correspondingly, the communication device given in the embodiments of the present application can also implement these features or functions, which will not be described here.

[0407] It should be understood that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method embodiments can be completed by integrated logic circuits or instruction in the form of software in the processor. The processor can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0408] It is to be appreciated that the memory in the embodiments of the application can be a volatile memory or a nonvolatile memory, or can include both volatile and nonvolatile memory. Where the nonvolatile memory is, for example, read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically EPROM (EEPROM), or flash memory. The volatile memory, which can be used as external cache, can be, for example, random access memory (RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct Rambus RAM (DR RAM). It is to be appreciated that the memory described herein expressly includes, but is not limited to these and any other suitable types of memory.

[0409] The application further provides a computer readable medium, which stores a computer program or instructions, and when the computer program or instructions are executed by a communication device, the function of any of the above method embodiments is realized.

[0410] The application further provides a computer program product including instructions, and when the computer program product is read and executed by a computer, the computer realizes the function of any of the above method embodiments.

[0411] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium accessible by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as high-density digital video disc (digital video disc, DVD)), or semiconductor media (such as solid state disk (solid state disk, SSD)) and the like.

[0412] The above description is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of information transmission, characterized in that, The method comprises: receiving first information sent by a source access network device, the first information being used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI being used to scramble a first physical downlink control channel (PDCCH), the first PDCCH being used to carry scheduling information of a message 2, the first beam being used to transmit a message 1 and the message 2, the message 1 comprising a preamble, and the message 2 comprising time advance (TA) information of a group head user equipment (UE) in a UE group and uplink resource allocation information of all UEs in the UE group; determining the first RA-RNTI and the first beam based on the first information; receiving the first PDCCH scrambled by the first RA-RNTI and broadcast by a target access network device; descrambling the first PDCCH based on the first RA-RNTI to obtain the scheduling information of the message 2; receiving the message 2 broadcast by the target access network device based on the scheduling information of the message 2 and through the first beam.

2. The method of claim 1, wherein, The receiving first information sent by a source access network device comprises: receiving the first information sent by the source access network device through a radio resource control (RRC) message.

3. The method of claim 1, wherein, The receiving first information sent by a source access network device comprises: receiving a second PDCCH broadcast by the source access network device, the second PDCCH being scrambled by a group radio network temporary identifier (G-RNTI) of the UE group, and the second PDCCH being used to carry scheduling information of the first information; descrambling the second PDCCH based on the G-RNTI of the UE group to obtain the scheduling information of the first information; receiving the first information broadcast by the source access network device based on the scheduling information of the first information.

4. The method according to any one of claims 1 to 3, characterized in that, After the receiving first information sent by a source access network device, the method further comprises: sending third information to the source access network device, the third information indicating that the first information has been received.

5. The method according to any one of claims 1 to 4, characterized in that, The first information indicates one or more of the following information: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam.

6. The method according to any one of claims 1 to 5, characterized in that, Before the receiving first information sent by a source access network device, the method further comprises: receiving a second command sent by the source access network device; wherein the second command carries an identifier of the group head UE, or the second command carries information indicating that a UE receiving the second command is a non-group head UE, or the second command is different from a first command sent by the source access network device to a group head UE, the first command indicating that a UE receiving the first command is a group head UE, and the second command indicating that a UE receiving the second command is a non-group head UE.

7. The method of claim 6, wherein, The second command further carries a group radio network temporary identifier (G-RNTI) of the UE group.

8. The method according to claim 6 or 7, characterized in that, The first command and the second command indicate cell switching.

9. An information transmission method characterized by, The method comprises: receiving first information sent by a target access network device, the first information being used to determine a first random access radio network temporary identifier (RA-RNTI) and a first beam, the first RA-RNTI being used to scramble a first physical downlink control channel (PDCCH), the first PDCCH being used to carry scheduling information of a message 2, the first beam being used to transmit the message 1 and the message 2, the message 1 comprising a preamble, and the message 2 comprising time advance (TA) information of a group header user equipment (UE) in a UE group and uplink resource allocation information of all UEs in the UE group; sending the first information to non-group header UEs in the UE group.

10. The method of claim 9, wherein, The sending the first information to non-group header UEs in the UE group comprises: sending the first information to non-group header UEs in the UE group through a radio resource control (RRC) message.

11. The method of claim 9, wherein, The sending the first information to non-group header UEs in the UE group comprises: broadcasting a second PDCCH scrambled by a group radio network temporary identifier (G-RNTI) of the UE group, the second PDCCH being used to carry scheduling information of the first information; broadcasting the first information.

12. The method according to any one of claims 9 to 11, characterized in that, After the sending the first information to non-group header UEs in the UE group, the method further comprises: starting a timer; when the timer expires, sending second information to the target access network device, the second information indicating that the first PDCCH and the message 2 are sent.

13. The method according to any one of claims 9 to 12, characterized in that, After the sending the first information to non-group header UEs in the UE group, the method further comprises: when receiving third information sent by all non-group header UEs, sending second information to the target access network device, the second information indicating that the first PDCCH and the message 2 are sent, the third information indicating that the non-group header UE has received the first information.

14. The method according to any one of claims 9 to 13, characterized in that, The first information indicates one or more of the following information: the first RA-RNTI, a physical random access channel (PRACH) resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block (SSB) corresponding to the first beam.

15. The method according to any one of claims 9 to 14, characterized in that, Before the receiving first information sent by a target access network device, the method further comprises: sending a group switching request to the target access network device, the group switching request being used to request cell switching of the UE group, and an identifier of the group header UE being carried in the group switching request; receiving switching confirmation information sent by the target access network device; sending a first command to the group header UE; sending a second command to the non-group header UEs; The first command and the second command each carry an identifier of the group head UE; or the first command carries information indicating that a UE receiving the first command is a group head UE, and the second command carries information indicating that a UE receiving the second command is a non-group head UE; or the signaling names of the first command and the second command are different, the first command indicates information that a UE receiving the first command is a group head UE, and the second command indicates information that a UE receiving the second command is a non-group head UE.

16. The method of claim 15, wherein, The second command further carries a group mobile user temporary identifier G-RNTI of the UE group.

17. The method according to claim 15 or 16, characterized in that The first command and the second command indicate cell switching.

18. An information transmission method characterized by comprising: The method comprises: receiving, using a first beam, a message msg1 sent by a group head UE in a user equipment UE group, the msg1 comprising a preamble; sending first information to a source access network device, the first information being used to determine a first random access wireless network temporary identifier RA-RNTI and the first beam, the first RA-RNTI being used to scramble a first physical downlink control channel PDCCH, the first PDCCH being used to carry scheduling information of a msg2, the msg2 comprising time advance TA information of the group head UE and uplink resource allocation information of all UEs in the UE group; broadcasting the first PDCCH scrambled by the first RA-RNTI; broadcasting the msg2 through the first beam.

19. The method of claim 18, wherein, Before the sending of the first PDCCH scrambled by the first RA-RNTI, the method further comprises: receiving second information sent by the source access network device, the second information indicating the sending of the first PDCCH and the msg2.

20. The method of claim 18 or 19, wherein, The first information indicates one or more of the following: the first RA-RNTI, a physical random access channel PRACH resource corresponding to the preamble, the preamble, an identifier of the first beam, or an identifier of a synchronization signal block SSB corresponding to the first beam.

21. The method of any one of claims 18-20, wherein, Before the receiving, using a first beam, of a message msg1 sent by a group head UE in a user equipment UE group, the method further comprises: receiving a group switching request sent by the source access network device, the group switching request being used to request cell switching of the UE group, the group switching request carrying an identifier of the group head UE; sending switching confirmation information to the source access network device.

22. A communications device, characterized by A unit for performing the method of any one of claims 1-8, or a unit for performing the method of any one of claims 9-17, or a unit for performing the method of any one of claims 18-21.

23. A communications device, characterized by A processor and a memory, the processor and the memory being coupled, the processor being configured to implement the method of any one of claims 1-8, or the processor being configured to implement the method of any one of claims 9-17, or the processor being configured to implement the method of any one of claims 18-21.

24. A chip, characterized by An apparatus comprising a processor and an interface coupled to the processor; the interface for receiving or outputting signals, the processor for executing code instructions to cause the method of any one of claims 1-8 to be performed, or to cause the method of any one of claims 9-17 to be performed, or to cause the method of any one of claims 18-21 to be performed.

25. A computer-readable storage medium, characterized in that, A computer readable storage medium having stored computer executable instructions, which when invoked by the computer, cause the computer to perform the method of any one of claims 1-8, or cause the computer to perform the method of any one of claims 9-17, or cause the computer to perform the method of any one of claims 18-21.

26. A computer program product, characterised in that, A computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method of any one of claims 1-8, or causes the computer to perform the method of any one of claims 9-17, or causes the computer to perform the method of any one of claims 18-21.

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