Method and device for implementing group call service transmission based on 5g trunking communication system

Abstract

The application discloses a group call service transmission realization method and device based on a 5G cluster communication system, and the group call service transmission realization method based on the 5G cluster communication system adds a cluster group call downlink point-to-multipoint communication mechanism on the basis of the 5G point-to-point communication technology, so as to realize the transmission of the cluster group call service. In consideration of the transmission reliability of the enhanced cluster group call service, the application provides a method for simultaneously supporting PTP and PTM transmission of the cluster group call service, and a method for dynamically converting PTP and PTM in the process of receiving the cluster group call service by a UE. The application realizes quick call establishment and air interface transmission of the cluster point-to-multipoint service. The dynamic conversion of the point-to-multipoint service receiving mode is provided, and the PTP and PTM dynamic conversion is provided for the cluster user according to factors such as the channel quality condition and the network load condition, so that the transmission reliability of the point-to-multipoint service is better improved compared with the B-TrunC cluster system.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and apparatus for implementing trunking group call service transmission based on a 5G trunking communication system. Background Technology

[0002] Trunked radio systems are dedicated wireless communication systems developed to meet the command and dispatch needs of various industries, with a wide range of applications in public safety, transportation, public utilities, petrochemicals, industry and commerce, and the military. With the continuous development of mobile communication technologies (such as 5G), trunked radio systems are also evolving to better meet the needs of industry users for new broadband multimedia trunked radio services.

[0003] 5G technology not only offers significant improvements in bandwidth, capacity, number of users, latency, and reliability, but also represents a major shift in network architecture and NR air interface transmission technology. 5G adopts a Service-Based Network Architecture (SBA) and utilizes key technologies such as NFV and SDN to decompose, reconstruct, and enhance 4G EPC network elements, breaking them down into network functions (NFs) and achieving complete separation of the control plane and user plane. 5G also employs New Radio (NR) design, featuring numerous technical enhancements and improvements compared to 4G LTE, including support for larger carrier bandwidth and better spectrum range, flexible frame structures, diverse parameter sets, new coding systems, and symbol-level resource scheduling. Adding trunking service features to existing 5G technology to realize 5G trunking communication systems represents the future direction of trunking communication system development.

[0004] A trunking communication system based on 5G technology can not only support various multimedia services of the 5G mobile communication system itself, but also better provide trunking visualization basic services and trunking multimedia services, such as visual individual calls, visual group calls, video push to groups, video pull-up, pre-emptive priority calls, multicast short messages, status data, scheduling area selection, environmental monitoring and multimedia messaging services, etc.

[0005] Group services are typical services in trunked systems, involving multiple users, such as group call services. To achieve rapid call setup for trunked group call services, considering the point-to-multipoint nature of these services, downlink control plane signaling and user plane data are typically transmitted via broadcast in LTE broadband trunked communication systems (such as the B-TrunC trunked communication system). Idle group call users do not need to switch to a connected state to directly receive control plane signaling and user plane data, thereby accelerating call setup and service data reception.

[0006] Chinese invention patent document CN201110194202.0 discloses a method for transmitting downlink data in a trunking group call service. The method includes: after receiving paging control information from the trunking paging control channel TPCCH, the user UE listens to the physical downlink control channel PDCCH; the UE uses an identifier to descramble the received PDCCH to obtain downlink grant information; the UE demultiplexes the Media Access Layer Protocol Data Unit (MAC PDU) obtained according to the downlink grant information to obtain the trunking group call logical channel number; the trunking group call logical channel number determines the trunking group call logical channel type, and the downlink data in the Media Access Layer Service Data Unit (MAC SDU) corresponding to the trunking group call logical channel type is transmitted.

[0007] The aforementioned patents ensure the normal transmission of downlink data, thereby reducing downlink data transmission latency. However, due to the randomness of the location of users in a trunking group, effective reception by trunking group users is generally ensured through a lower MCS level and higher transmission power. Therefore, how to implement trunking group call services on the basis of 5G has become a very urgent problem to be solved. Thus, this paper proposes a method and apparatus for implementing trunking group call services based on a 5G trunking communication system. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a method for implementing trunking group call service transmission based on a 5G trunking communication system, comprising the following steps:

[0009] In the S1 5G trunking communication system, the base station notifies the trunking paging configuration and trunking group BWP configuration information through system messages, and the trunking terminal obtains the relevant system information of the trunking and completes the relevant configuration.

[0010] When there is a group call service, the base station selects to use PTM or PTM+PTP mode to perform downlink transmission of the group call service.

[0011] When S3 selects the PTM+PTP mode, trunking terminals in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states receive trunking group call service signaling and data via PTM; trunking terminals in the RRC_CONNECTED state receive trunking group call service signaling and data via PTP according to the base station's instructions.

[0012] For the selected PTM+PTP mode, S4, the base station will switch the group call mode of the designated group terminal receiving the group call service from PTM to PTP or from PTP back to PTM according to the set principle.

[0013] Furthermore, in the method, PTM specifically refers to:

[0014] The base station sends a cluster paging message to the trunking terminal via the TPCCH channel according to its configuration. The trunking terminal [zx1] receives the cluster paging message at the corresponding paging time and performs relevant configurations based on the cluster paging message;

[0015] After the base station completes sending the paging message, it sends the relevant signaling for establishing the trunking group call service and the group call service data of the trunking group through the TCCH and TTCH channels; after the trunking terminal completes the relevant configuration of the group call, it answers the group call on the corresponding channel.

[0016] Furthermore, in the method, the cluster paging configuration includes configuration information for the TPCCH channel and configuration information for the cluster paging search space, which enables the cluster terminal to receive cluster group paging messages.

[0017] Furthermore, in the method, the configuration of the cluster group BWP includes cluster group downlink BWP configuration information and cluster group uplink BWP configuration information; wherein

[0018] The downlink BWP configuration of the cluster group includes BWP location and bandwidth, subcarrier spacing, cyclic prefix type, cluster group control resource set, cluster group search space configuration, and common PDSCH configuration associated with the cluster group, which enables the cluster terminal to receive signaling and service data of the cluster group.

[0019] The uplink BWP configuration of the cluster group includes BWP location and bandwidth, subcarrier spacing, cyclic prefix type, and control resource set corresponding to the physical cluster feedback channel (PTFCH), which is used for the cluster terminal to transmit cluster group-related feedback information to the base station.

[0020] Furthermore, in the method, the base station sends cluster paging messages to the cluster terminal over the air interface according to the cluster paging message sending period and paging time, based on the configuration information of the TPCCH channel and the configuration information of the cluster paging search space. The cluster terminal receives the paging messages sent by the base station within a cluster paging message sending period at the corresponding paging time.

[0021] Furthermore, for cluster group call services where downlink PTP and PTM conversion is not performed, transmission is only performed in PTM mode.

[0022] Furthermore, in the method, the cluster terminal listens to the PDCCH channel scrambled with TP-RNTI on the cluster paging time-frequency domain resources corresponding to the cluster paging;

[0023] If scheduling information carrying the TPCCH channel is received on this channel, the cluster terminal decodes the transport block TB of the TPCCH carried on the PDSCH channel.

[0024] If the TB information of TPCCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the RRC layer, which will then process the received cluster paging message.

[0025] Furthermore, in the method, if the paging message received by the cluster terminal contains the cluster group number ID to which it belongs, and the cluster terminal wishes to answer the group call, then the cluster terminal listens to the PDCCH channel scrambled by the G-RNTI in the corresponding cluster group search space according to the configuration of the cluster group BWP and the corresponding G-RNTI contained in the paging message; at the same time, it determines whether to provide feedback and the feedback method according to the scheduling information of this DCI. If feedback is required, it provides feedback according to the feedback method and the PTFCH time-frequency resource location.

[0026] Furthermore, in the method, if scheduling information carrying the TCCH channel is received on the channel, the scheduling information is handed over to the cluster HARQ entity for processing.

[0027] If the TB information of the TCCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the RRC layer. The RRC layer will then process the relevant signaling of the received trunking service, establish a group context, configure the corresponding TCCH and TTCH, and generate SDAP entity, PDCP entity, RLC entity and MAC entity to establish the downlink bearer for the group call in order to receive trunking group call service data.

[0028] Furthermore, in the method, after sending the paging message of the cluster group, the base station sends relevant signaling for establishing the cluster group call service through the TCCH channel, and indicates in the DCI of the scheduling TCCH whether to enable the feedback mechanism and feedback method under PTM mode and the corresponding physical cluster feedback channel PTFCH time-frequency resource location. If feedback is supported, the base station will retransmit according to the feedback information.

[0029] Furthermore, in the method, the signaling includes whether the PTP and PTM conversion function is enabled for this group call, the configuration information of the downlink bearer of the group call, the dedicated configuration of the group resources, and optional configuration scheduling related configurations.

[0030] The optional configurations related to scheduling include configuring the scheduling period, CS-G-RNTI, and the number of HARQ processes used to configure the scheduling method.

[0031] Furthermore, in the method, after the trunking terminal completes the relevant configuration for the group call, the trunking terminal answers the group call. Then, according to the configuration of the trunking group BWP and the corresponding G-RNTI contained in the paging message and the CS-G-RNTI contained in the group call signaling, the trunking terminal listens in the corresponding trunking group search space for the PDCCH channel scrambled by the G-RNTI / CS-G-RNTI. At the same time, it determines whether to perform feedback and the feedback method according to the scheduling information indication of this DCI. If feedback is required, it performs the corresponding feedback according to the feedback method and the PTFCH time-frequency resource location.

[0032] Furthermore, in the method, if scheduling information carrying the TTCH channel is received on the channel, the scheduling information is handed over to the cluster HARQ entity for processing; if the TB information of the TTCH is successfully decoded, the correctly decoded MACPDU is transmitted to the higher layer.

[0033] Furthermore, in the method, during multi-beam operation, the base station repeatedly transmits the same cluster-related configuration information, cluster paging messages, cluster service-related signaling, or cluster service data in all transmitted beams. The implementation of the cluster terminal determines which beam to select for receiving the cluster-related configuration information, cluster paging messages, cluster service-related signaling, or cluster service data. The cluster terminal receives the cluster-related configuration information, cluster paging messages, cluster service-related signaling, or cluster service data on the corresponding beam.

[0034] Furthermore, in the method, when requesting to switch the group call mode from PTM to PTP, the UE may actively request a dynamic switch or the base station may initiate a dynamic switch.

[0035] Furthermore, in the method, if the UE receives group call services poorly in PTM mode for a period of time, or if the UE's Channel Quality Status (CQI) is lower than the CQI threshold for switching from PTM to PTP, or if the UE's RSRP value is lower than the RSRP threshold for switching from PTM to PTP, the UE actively initiates a group call reception mode conversion request, requesting the terminal to switch the group call reception mode from PTM to PTP mode.

[0036] If the UE's Channel Quality Status (CQI) is higher than the CQI threshold for switching from PTP to PTM or the UE's RSRP value is higher than the RSRP threshold for switching from PTP to PTM for a certain period of time, the UE will actively initiate a group call reception mode conversion request, requesting the terminal to switch the group call reception mode from PTP to PTM.

[0037] Furthermore, in the method, when the UE actively requests dynamic switching, the UE sends a cluster group reception mode switching request information to the base station. If the UE is in the RRC_IDLE or RRC_INACTIVE state, it first enters the RRC_CONNECTED state before sending the request information.

[0038] This information includes: the method the UE expects to receive group calls, the group ID or G-RNTI of the group call the UE is currently receiving, and optionally the most recently received PDCP SN.

[0039] Furthermore, in the method, the base station decides whether to switch the UE's reception mode based on the overall load of the cell, the load of the cluster group BWP within the cell, the resource usage of the BWP configured for the UE, the UE's channel quality status, and its location information, and replies to the UE with a response / rejection. In the case of the UE switching from PTM to PTP mode, the base station also includes the configuration information of the separate bearer corresponding to the cluster group call service when replying to the UE.

[0040] Furthermore, in the method, if the cluster group receives the mode conversion request information through an RRC reconfiguration message or UE assistance information, the base station responds to the UE through the RRC reconfiguration message.

[0041] If the cluster group reception mode conversion request information is carried by adding a new cluster group reception mode conversion request message, the base station uses the new cluster group reception mode conversion response message / cluster group reception mode conversion rejection message to reply to the UE.

[0042] Furthermore, in the method, when the base station initiates dynamic switching, the base station determines the UE receiving mode based on the overall load of the cell, the load of the cluster group BWP in the cell, the number of terminals in the cell receiving this group call, and the known channel quality status and location information of the UE receiving the group call, and sends the cluster group receiving mode switching configuration information through RRC dedicated signaling.

[0043] This information includes: the group call group ID or G-RNTI, the UE's group call reception mode conversion indication, the bearer configuration information corresponding to the converted mode, the optional PDCP SN, and the scheduling information of the optional configuration scheduling mode.

[0044] Furthermore, in the method, the UE receives the cluster group reception mode conversion indication information, performs relevant configuration, sends back the configuration completion information to the base station, and receives the signaling and data of the cluster group call according to the converted reception mode.

[0045] Furthermore, in the method, if the cluster group receiving mode conversion configuration information is carried through an RRC reconfiguration message, the UE replies to the base station through an RRC reconfiguration completion message;

[0046] If the cluster group reception mode conversion configuration information is carried through a newly added cluster group reception mode conversion message, the UE uses the newly added cluster group reception mode conversion completion message to reply to the base station.

[0047] On another level, the present invention provides a device for implementing trunking group call service transmission based on a 5G trunking communication system, characterized in that it includes a determination module, a transmission module, a receiving update module, and a reset and reconstruction module; and adds a logical channel, a transmission channel, and a physical channel;

[0048] The logical channels mentioned above include the trunking paging control channel (TPCCH), the trunking control channel (TCCH), and the trunking control channel (TTCH).

[0049] The transmission channel is a trunked paging channel (TPCH).

[0050] The physical channel is the Physical Cluster Feedback Channel (PTFCH), which is used to transmit feedback information related to the cluster group.

[0051] Furthermore, MAC indicates radio resource allocation via PDCCH, and the RNTI mapped onto PDCCH depends on the logical channel type.

[0052] Furthermore, TP-RNTI (Trunking Paging RNTI) is used to scramble the CRC of the PDCCH corresponding to the TPCCH and to initialize the scrambling of the TPCCH.

[0053] Furthermore, G-RNTI (Group Call RNTI) / CS-G-RNTI (Configuration and Scheduling Group Call RNTI) is used to scramble the CRC of the PDCCH corresponding to TCCH and TTCH, and to initialize the scrambling for TCCH and TTCH.

[0054] Furthermore, the mapping path of the cluster paging control channel TPCCH is TPCCH – TPCH – PDSCH;

[0055] The mapping path for the cluster control channel TCCH is TCCH - DL-SCH - PDSCH;

[0056] The mapping path for the trunking service channel TTCH is TTCH - DL-SCH - PDSCH.

[0057] Furthermore, a PDCP entity is established for each TDRB on the network side. The PDCP entity sends duplicated PDCP data packets to different RLC entities. The PDCP entity is responsible for performing PTM and PTP transmissions.

[0058] For initial PTM transmission, the PDCP entity operates simultaneously in PTM and PTP modes. For PDCP packet retransmission, the PDCP entity can operate in PTM and / or PTP modes.

[0059] For PTM mode, point-to-multipoint trunking service data is transmitted for trunking groups on the TTCH channel;

[0060] For PTP mode, point-to-multipoint trunking service data is transmitted to the UEs specified in the trunking group on the DTCH channel.

[0061] Furthermore, on the UE side, PTM and / or PTP reception is employed.

[0062] In the PTM mode, the UE listens to the PDCCH scrambled by G-RNTI / CS-G-RNTI to receive cluster point-to-multipoint service data carried on the TTCH channel;

[0063] For PTP mode, the UE listens to the PDCCH scrambled by C-RNTI / CS-RNTI to receive cluster point-to-multipoint service data carried on the DTCH channel;

[0064] The UE side combines, reorders, detects and discards data packets from two independent logical channels at the PDCP layer, and provides uplink feedback via DTCH using C-RNTI.

[0065] The beneficial effects of this invention are as follows:

[0066] This invention addresses the point-to-multipoint characteristics of trunking services and the needs of industry users. Based on 5G NR air interface technology, it designs a Layer 2 architecture supporting trunking functions and an air interface channel mechanism for trunking point-to-multipoint services (such as group calls), enabling rapid call establishment and air interface transmission for trunking point-to-multipoint services. Simultaneously, considering the reliability of trunking point-to-multipoint services, it provides dynamic switching of the point-to-multipoint service reception mode. Based on factors such as the user's channel quality and network load, it provides dynamic switching between PTP and PTM modes for trunking users, significantly improving the transmission reliability of point-to-multipoint services compared to the B-TrunC trunking system. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 Wake-up cycle and wake-up diagram provided for embodiments of this application;

[0069] Figure 2 This is a wireless frame structure diagram provided for an embodiment of this application.

[0070] Figure 3 This is a downlink signal mapping diagram provided in the embodiments of this application;

[0071] Figure 4 This is an uplink signal mapping diagram provided in the embodiments of this application. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0074] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0075] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0076] Example 1

[0077] This embodiment provides a method for implementing trunking group call service transmission based on a 5G trunking communication system, including the following steps:

[0078] In the S1 5G trunking communication system, the base station notifies the trunking paging configuration and trunking group BWP configuration information through system messages, and the trunking terminal obtains the relevant system information of the trunking and completes the relevant configuration.

[0079] When there is a group call service, the base station selects to use PTM or PTM+PTP mode to perform downlink transmission of the group call service.

[0080] When S3 selects the PTM+PTP mode, trunking terminals in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states receive trunking group call service signaling and data via PTM; trunking terminals in the RRC_CONNECTED state receive trunking group call service signaling and data via PTP according to the base station's instructions.

[0081] For the selected PTM+PTP mode, S4, the base station will switch the group call mode of the designated group terminal receiving the group call service from PTM to PTP or from PTP back to PTM according to the set principle.

[0082] In this embodiment, the PTM method is specifically as follows:

[0083] The base station sends a cluster paging message to the cluster terminal via the TPCCH channel according to its configuration. The cluster terminal [zx2] receives the cluster paging message at the corresponding paging time and performs relevant configurations based on the cluster paging message;

[0084] After the base station completes sending the paging message, it sends the relevant signaling for establishing the trunking group call service and the group call service data of the trunking group through the TCCH and TTCH channels; after the trunking terminal completes the relevant configuration of the group call, it answers the group call on the corresponding channel.

[0085] This embodiment adds trunking functionality to existing 5G technology, enabling group services such as trunking group calls, video push to groups, and multicast SMS.

[0086] In this embodiment, for PTM-based group call services, UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states can all receive group call services.

[0087] In this embodiment, under PTP mode, the trunking group call service transmission is for UEs in the RRC_CONNECTED state. The relevant signaling of the trunking group call service is carried through the DCCH channel, and the trunking group call service data is carried through the DTCH channel. The UE in the RRC_CONNECTED state listens to the PDCCH scrambled by C-RNTI / CS-RNTI and receives the signaling and data of the trunking group call service carried on the DCCH / DTCH channel.

[0088] This embodiment adds a trunking group call downlink point-to-multipoint (PTM) communication mechanism to the 5G point-to-point (PTP) communication technology to realize the transmission of trunking group call services.

[0089] This embodiment takes into account the need to enhance the transmission reliability of trunking group call services, and provides a method for trunking group call services to simultaneously support PTP and PTM transmission, as well as a method for dynamic conversion between PTP and PTM during the UE's reception of trunking group call services.

[0090] Example 2

[0091] In terms of specific applications, this embodiment provides a configuration method related to broadcast cluster groups. Based on a 5G cluster communication system, this embodiment first notifies the cluster paging configuration and cluster group BWP configuration through broadcast messages.

[0092] This embodiment of the cluster paging configuration includes configuration information for the TPCCH channel and configuration information for the cluster paging search space, which enables the cluster terminal to receive cluster group paging messages.

[0093] The configuration of the cluster group BWP in this embodiment includes the cluster group downlink BWP configuration information and the cluster group uplink BWP configuration information. The cluster group downlink BWP configuration includes BWP location and bandwidth, subcarrier spacing, cyclic prefix type, cluster group control resource set, cluster group search space configuration, and common PDSCH configuration associated with the cluster group, which are used to enable the cluster terminal to receive the signaling and service data of the cluster group.

[0094] In this embodiment, the uplink BWP configuration of the cluster group includes BWP location and bandwidth, subcarrier spacing, cyclic prefix type, and control resource set corresponding to the physical cluster feedback channel (PTFCH), which is used for the cluster terminal to transmit cluster group-related feedback information to the base station.

[0095] In a further implementation, for multi-beam operation, the base station in this embodiment will repeatedly transmit the same cluster-related configuration information in all transmitted beams. The implementation of the cluster terminal determines which beam to select for receiving the cluster-related configuration information, and the cluster terminal receives the cluster-related configuration information on the corresponding beam.

[0096] Example 3

[0097] In terms of specific applications, this embodiment provides a method for transmitting cluster paging messages during cluster paging. In this embodiment, the base station sends cluster paging messages to the cluster terminal over the air interface according to the cluster paging message sending period and paging time, based on the configuration information of the TPCCH channel and the configuration information of the cluster paging search space. The cluster terminal receives the paging messages sent by the base station within a cluster paging message sending period at the corresponding paging time.

[0098] In a further implementation, for multi-beam operation, the base station will repeatedly transmit the same trunking paging message in all transmitted beams. The implementation of the trunking terminal determines which beam to select for receiving the trunking paging message, and the trunking terminal receives the trunking paging message on the corresponding beam.

[0099] In this embodiment, the cluster paging message must contain at least the group ID of the paging cluster group and the corresponding G-RNTI.

[0100] In this embodiment, the cluster terminal listens to the PDCCH channel scrambled with TP-RNTI on the cluster paging time-frequency domain resources corresponding to the cluster paging.

[0101] Further implementation involves searching the search space for radio frames, subframes, time slots, and cluster paging.

[0102] In this embodiment, if scheduling information carrying the TPCCH channel is received on the channel, the cluster terminal decodes the transport block (TB) of the TPCCH carried on the PDSCH channel.

[0103] In this embodiment, if the TB information of TPCCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the RRC layer, which will then process the received cluster paging message.

[0104] In a further implementation, for multi-beam operation, the base station will repeatedly transmit the same trunking paging message in all transmitted beams. The implementation of the trunking terminal determines which beam to select for receiving the trunking paging message, and the trunking terminal receives the trunking paging message on the corresponding beam.

[0105] Example 4

[0106] In terms of specific applications, this embodiment provides a method for transmitting signaling to establish a trunking group call service. After sending a paging message for the trunking group, the base station sends relevant signaling for establishing the trunking group call service through the TCCH channel. This signaling includes whether the PTP and PTM conversion function is enabled for this group call, the configuration information of the downlink bearer of the trunking group call, the dedicated configuration of the trunking group resources, and optional configuration scheduling related configurations.

[0107] The optional configurations for scheduling in this embodiment include the scheduling period, CS-G-RNTI, and the number of HARQ processes used to configure the scheduling method.

[0108] In this embodiment, the DCI that schedules the TCCH indicates whether to enable the feedback mechanism and feedback method (NACK feedback only, ACK / NACK feedback) under PTM mode, as well as the corresponding physical cluster feedback channel PTFCH time-frequency resource location.

[0109] In this embodiment, if feedback is supported, the base station will retransmit based on the feedback information, and the number of retransmissions is determined by the system.

[0110] In this embodiment, if the paging message received by the cluster terminal contains the cluster group number ID to which it belongs, and the cluster terminal wishes to answer the group call, then the cluster terminal listens to the PDCCH channel scrambled by the G-RNTI in the corresponding cluster group search space according to the configuration of the cluster group BWP and the corresponding G-RNTI contained in the paging message.

[0111] In this embodiment, if scheduling information carrying the TCCH channel is received on the channel, the scheduling information is delivered to the cluster HARQ entity for processing.

[0112] In this embodiment, if the TB information of the TCCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the RRC layer. The RRC layer will then process the relevant signaling of the received trunking service, establish a group context, configure the corresponding TCCH and TTCH, generate relevant entities, and establish the downlink bearer for the group call to receive trunking group call service data.

[0113] Further implementation involves entities including the SDAP entity, PDCP entity, RLC entity, and MAC entity.

[0114] In this embodiment, the TCCH channel also carries signaling such as trunking group call service release and voice right notification.

[0115] In this embodiment, the decision on whether to provide feedback and the feedback method are determined based on the scheduling information of this DCI. If feedback is required, the feedback is provided in accordance with the feedback method and the PTFCH time-frequency resource location.

[0116] In a further implementation, for multi-beam operation, the base station also needs to repeatedly transmit the relevant signaling of the same trunking service in all transmitted beams. The implementation of the trunking terminal determines which beam to select for receiving the relevant signaling of the trunking service, and the trunking terminal receives the relevant signaling of the trunking service on the corresponding beam.

[0117] Example 5

[0118] In terms of specific applications, this embodiment provides a method for transmitting trunking group call service data. In this embodiment, after the base station sends relevant signaling for establishing trunking group call service, it sends the group call service data of the trunking group through the TTCH channel.

[0119] In this embodiment, the DCI that schedules TTCH indicates whether to enable the feedback mechanism and feedback method under PTM mode, as well as the time and frequency resource location of the corresponding physical cluster feedback channel PTFCH.

[0120] In this embodiment, if feedback is supported, the base station will retransmit based on the feedback information, and the number of retransmissions is determined by the system.

[0121] In this embodiment, after the trunking terminal completes the relevant configuration for the group call, the trunking terminal answers the group call. Then, according to the configuration of the trunking group BWP and the corresponding G-RNTI contained in the paging message and the CS-G-RNTI (if any) contained in the group call signaling, the trunking terminal listens to the PDCCH channel scrambled by the G-RNTI / CS-G-RNTI in the corresponding trunking group search space.

[0122] In this embodiment, if scheduling information carrying the TTCH channel is received on this channel, the scheduling information is delivered to the cluster HARQ entity for processing.

[0123] In this embodiment, if the TB information of TTCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the higher layer.

[0124] In this embodiment, the decision on whether to provide feedback and the feedback method are determined based on the scheduling information of this DCI. If feedback is required, the feedback is provided in accordance with the feedback method and the PTFCH time-frequency resource location.

[0125] In a further implementation, for multi-beam operation, the base station also needs to repeatedly transmit the same trunking service data in all transmitted beams. The implementation of the trunking terminal determines which beam to select for receiving trunking service data, and the trunking terminal receives the trunking service data on the corresponding beam.

[0126] Example 6

[0127] In terms of specific applications, this embodiment provides a method for dynamic switching between PTP and PTM during the UE receiving trunking group call service, including a UE-initiated dynamic switching method and a base station-initiated dynamic switching method.

[0128] In this embodiment, when the UE actively requests dynamic switching, the UE sends a cluster group reception mode switching request information to the base station. If the UE is in the RRC_IDLE or RRC_INACTIVE state, it first enters the RRC_CONNECTED state before sending the request information.

[0129] The request information in this embodiment includes: the method the UE expects to receive group calls, the group number ID or G-RNTI that the UE is currently receiving in the group call, and optionally the most recently received PDCP SN.

[0130] In this embodiment, the request information can be carried in the RRC reconfiguration message, in the UE auxiliary information reporting, or by changing the request message through the addition of a new cluster group receiving method.

[0131] In this implementation, if the UE receives group call services poorly via PTM mode for a period of time, or if the UE's Channel Quality Status (CQI) is lower than the CQI threshold for switching from PTM to PTP, or if the UE's RSRP value is lower than the RSRP threshold for switching from PTM to PTP, the UE can proactively initiate a group call reception mode conversion request to request the terminal to switch the group call reception mode from PTM to PTP mode.

[0132] In this implementation, if the UE's Channel Quality Status (CQI) is higher than the CQI threshold for switching from PTP to PTM or the UE's RSRP value is higher than the RSRP threshold for switching from PTP to PTM within a certain period of time, the UE can proactively initiate a group call reception mode conversion request to request the terminal to switch the group call reception mode from PTP to PTM.

[0133] In this implementation, the base station decides whether to switch the UE's reception mode based on the overall load of the cell, the load of the cluster group BWP in the cell, the resource usage of the BWP configured for the UE, the UE's channel quality status, and its location information, and then replies to the UE with a response / rejection.

[0134] In this embodiment, when the UE switches from PTM to PTP mode, the base station also includes the configuration information of the separate bearer corresponding to the trunking group call service when replying to the UE.

[0135] In this implementation, if the cluster group reception mode conversion request information is carried in an RRC reconfiguration message or UE auxiliary information, the base station responds to the UE using the RRC reconfiguration message. If the cluster group reception mode conversion request information is carried in a newly added cluster group reception mode conversion request message, the base station responds to the UE using a newly added cluster group reception mode conversion response message / cluster group reception mode conversion rejection message.

[0136] In this embodiment, when the base station initiates the dynamic switching method, the base station comprehensively considers factors such as the overall load of the cell, the load of the group BWP in the cell, the number of terminals in the cell receiving the group call, and the known channel quality status and location information of the UE receiving the group call, and sends the group reception method switching configuration information through RRC dedicated signaling.

[0137] The configuration information for this embodiment includes: the group call group ID or G-RNTI, the UE receiving group call mode conversion indication, the bearer configuration information corresponding to the converted mode, the optional PDCP SN, and the scheduling information for the optional configuration scheduling mode.

[0138] In this embodiment, the cluster group receiving mode conversion configuration information can be carried through RRC reconfiguration messages or newly added cluster group receiving mode conversion messages.

[0139] In this embodiment, the UE receives the trunking group reception mode conversion indication information, performs the relevant configuration, and sends a configuration completion message back to the base station. Furthermore, it receives the trunking group call signaling and data according to the converted reception mode.

[0140] In this embodiment, if the cluster group receiving mode conversion configuration information is carried through an RRC reconfiguration message, the UE replies to the base station through an RRC reconfiguration completion message.

[0141] In this embodiment, if the cluster group reception mode conversion configuration information is carried through a newly added cluster group reception mode conversion message, the UE uses the newly added cluster group reception mode conversion completion message to reply to the base station.

[0142] Example 7

[0143] This embodiment provides a Layer 2 architecture that supports trunking functionality. This embodiment is based on a Layer 2 architecture that supports trunking functionality in a 5G trunking communication system. When dealing with trunking group call services and scenarios where downlink PTP and PTM conversion is not performed, only PTM transmission is used. The Layer 2 architecture diagram is shown below. Figure 1 As shown.

[0144] In this embodiment, the Figure 1The Trunking HARQ within the dashed box is configurable. When the network side is configured to support downlink HARQ feedback for trunked group call services, in the... Figure 1 Lieutenant generals have Trunking HARQ; otherwise, they do not.

[0145] This embodiment addresses a scenario where downlink group call services involve PTP and PTM conversion. Based on the characteristics of point-to-multipoint group call services, it primarily uses PTM transmission, supplemented by PTP transmission. The layer-2 architecture diagram for the group call service is shown below. Figure 2 As shown.

[0146] In this embodiment, the Figure 2 The Trunking HARQ within the dashed box is configurable. When the network side is configured to support downlink HARQ feedback for trunked group call services, in the... Figure 2 Lieutenant generals have Trunking HARQ; otherwise, they do not.

[0147] In this embodiment, only one PDCP entity is established for each TDRB on the network side (serving all UEs in the cluster group). The PDCP entity sends duplicated PDCP data packets to different RLC entities.

[0148] In this embodiment, the PDCP entity is responsible for performing PTM and PTP transmissions. For the initial PTM transmission, the PDCP entity operates in both PTM and PTP modes simultaneously. For PDCP data packet retransmissions, the PDCP entity can operate in PTM and / or PTP modes.

[0149] In this embodiment, for the PTM mode, point-to-multipoint trunking service data is transmitted for the trunking group on the TTCH channel.

[0150] In this embodiment, for the PTP method, point-to-multipoint trunking service data is transmitted to the UEs specified in the trunking group on the DTCH channel.

[0151] In this embodiment, on the UE side, for a single TDRB, two reception methods can be used: PTM and / or PTP. For PTM, the UE listens to the G-RNTI / CS-G-RNTI scrambled PDCCH to receive cluster point-to-multipoint service data carried on the TTCH channel.

[0152] In this embodiment, for the PTP mode, the UE listens to the PDCCH scrambled by C-RNTI / CS-RNTI to receive cluster point-to-multipoint service data carried on the DTCH channel.

[0153] In this embodiment, since the PDCP SN of these data packets is assigned by a PDCP entity on the network side, the UE combines, reorders, detects and discards data packets of two independent logical channels at the PDCP layer, and provides uplink feedback (i.e., PDCP status report) through DTCH using C-RNTI.

[0154] In this embodiment, for group call related signaling, PTM mode transmits through the TCCH channel, and PTP mode transmits through the DCCH channel.

[0155] Example 8

[0156] This embodiment provides a channel design method to support trunking functionality. Based on existing 5G NR channel design, and combined with the point-to-multipoint transmission mechanism of the existing 4G LTE trunking system (i.e., B-TrunC trunking system), the following new channels are added to implement point-to-multipoint trunking service functionality in 5G:

[0157] Reference Figure 3 and Figure 4 As shown, the newly added logical channels in this embodiment include the trunking paging control channel TPCCH, the trunking control channel TCCH, and the trunking control channel TTCH.

[0158] The newly added transmission channel in this embodiment includes the trunking paging channel (TPCH).

[0159] The newly added physical channel in this embodiment includes the Physical Cluster Feedback Channel (PTFCH), which is used to transmit feedback information related to the cluster group.

[0160] In this embodiment, the mapping path for the trunking paging control channel TPCCH is TPCCH – TPCH – PDSCH, the mapping path for the trunking control channel TCCH is TCCH – DL-SCH – PDSCH, and the mapping path for the trunking traffic channel TTCH is TTCH – DL-SCH – PDSCH.

[0161] In this embodiment, the MAC indicates radio resource allocation through the PDCCH, and the RNTI mapped to the PDCCH depends on the logical channel type.

[0162] In this embodiment, TP-RNTI (Trunking Paging RNTI) is used to scramble the CRC of the PDCCH corresponding to the TPCCH and to initialize the scrambling of the TPCCH.

[0163] In this embodiment, G-RNTI (Group Call RNTI) / CS-G-RNTI (Configuration and Scheduling Group Call RNTI) is used to scramble the CRC of the PDCCH corresponding to TCCH and TTCH, and to initialize the scrambling of TCCH and TTCH.

[0164] In this embodiment, the trunking control channel (TCCH) and the trunking service channel (TTCH) are distinguished by different logical channel numbers (LCID) in the air interface layer 2 protocol.

[0165] Example 9

[0166] This embodiment provides a device for implementing trunking group call service transmission based on a 5G trunking communication system. It is characterized by including a determination module, a sending module, a receiving update module, and a reset and reconstruction module; and by adding a logical channel, a transmission channel, and a physical channel.

[0167] In summary, this invention, based on a 5G trunking communication system, adds trunking functionality to existing 5G technology to enable group services such as trunking group calls, video push to groups, and multicast SMS. Building upon 5G point-to-point (PTP) communication technology, a new downlink point-to-multipoint (PTM) communication mechanism for trunking group calls is added to facilitate the transmission of trunking group call services. Furthermore, considering the need to enhance the transmission reliability of trunking group call services, a method is provided for simultaneously supporting PTP and PTM transmissions in trunking group call services, as well as a method for the dynamic conversion between PTP and PTM during UE reception of trunking group call services.

[0168] This invention addresses the point-to-multipoint characteristics of trunking services and the needs of industry users. Based on 5G NR air interface technology, it designs a Layer 2 architecture supporting trunking functions and an air interface channel mechanism for trunking point-to-multipoint services (such as group calls), enabling rapid call establishment and air interface transmission for trunking point-to-multipoint services. Simultaneously, considering the reliability of trunking point-to-multipoint services, it provides dynamic switching of the point-to-multipoint service reception mode. Based on factors such as the user's channel quality and network load, it provides dynamic switching between PTP and PTM modes for trunking users, significantly improving the transmission reliability of point-to-multipoint services compared to the B-TrunC trunking system.

[0169] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0170] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of a necessary general-purpose hardware platform, or by a combination of hardware and software. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a computer product. The present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0171] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable resource update device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable resource update device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0172] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable resource update device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0173] These computer program instructions may also be loaded onto a computer or other programmable resource update device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0174] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0175] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0176] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for implementing trunking group call service transmission based on a 5G trunking communication system, characterized in that, The method includes the following steps: In the S1 5G trunking communication system, the base station notifies the trunking paging configuration and trunking group BWP configuration information through system messages, and the trunking terminal obtains the relevant system information of the trunking and completes the relevant configuration. When there is a group call service, the base station selects to use PTM or PTM+PTP mode to perform downlink transmission of the group call service. When S3 selects the PTM+PTP mode, trunking terminals in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states receive trunking group call service signaling and data via PTM; trunking terminals in the RRC_CONNECTED state receive trunking group call service signaling and data via PTP according to the base station's instructions. For the selected PTM+PTP mode, S4, the base station will switch the group call mode of the designated group terminal receiving the group call service from PTM to PTP or from PTP back to PTM according to the set principle.

2. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method described above, PTM specifically refers to: The base station sends a cluster paging message to the cluster terminal through the TPCCH channel according to the configuration. The cluster terminal receives the cluster paging message at the corresponding paging time and performs relevant configuration according to the cluster paging message. After the base station completes sending the paging message, it sends the relevant signaling for establishing the trunking group call service and the group call service data of the trunking group through the TCCH and TTCH channels. After the trunking terminal completes the relevant configuration for the group call, it will answer the group call on the corresponding channel.

3. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method, the cluster paging configuration includes configuration information for the TPCCH channel and configuration information for the cluster paging search space, which enables the cluster terminal to receive cluster group paging messages.

4. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method, the configuration of the cluster group BWP includes the cluster group downlink BWP configuration information and the cluster group uplink BWP configuration information. in The downlink BWP configuration of the cluster group includes BWP location and bandwidth, subcarrier spacing, cyclic prefix type, cluster group control resource set, cluster group search space configuration, and common PDSCH configuration associated with the cluster group, which enables the cluster terminal to receive signaling and service data of the cluster group. The uplink BWP configuration of the cluster group includes BWP location and bandwidth, subcarrier spacing, cyclic prefix type, and control resource set corresponding to the physical cluster feedback channel (PTFCH), which is used for the cluster terminal to transmit cluster group-related feedback information to the base station.

5. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method, the base station sends cluster paging messages to the cluster terminal over the air interface according to the configuration information of the TPCCH channel and the configuration information of the cluster paging search space, and according to the cluster paging message sending cycle and paging time. The trunking terminal receives the paging message sent by the base station within a trunking paging message transmission cycle at the corresponding paging time, and listens to the PDCCH channel scrambled with TP-RNTI on the trunking paging time-frequency domain resources corresponding to the trunking paging. If scheduling information carrying the TPCCH channel is received on this channel, the cluster terminal decodes the transport block TB of the TPCCH carried on the PDSCH channel. If the TB information of TPCCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the RRC layer, which will then process the received cluster paging message.

6. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 5, characterized in that, In the method described above, if the paging message received by the cluster terminal contains the cluster group number ID to which it belongs, and the cluster terminal wishes to answer the group call, then the cluster terminal listens to the PDCCH channel scrambled by the G-RNTI in the corresponding cluster group search space according to the configuration of the cluster group BWP and the corresponding G-RNTI contained in the paging message; at the same time, it determines whether to perform feedback and the feedback method according to the scheduling information of this DCI. If feedback is required, it performs the corresponding feedback according to the feedback method and the PTFCH time-frequency resource location.

7. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 5, characterized in that, In the method, if scheduling information carrying the TCCH channel is received on the channel, the scheduling information is handed over to the cluster HARQ entity for processing. If the TB information of the TCCH is successfully decoded, the correctly decoded MAC PDU will be transmitted to the RRC layer. The RRC layer will then process the relevant signaling of the received trunking service, establish a group context, configure the corresponding TCCH and TTCH, and generate SDAP entity, PDCP entity, RLC entity and MAC entity to establish the downlink bearer for the group call in order to receive trunking group call service data.

8. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method, after sending the paging message of the cluster group, the base station sends relevant signaling for establishing the cluster group call service through the TCCH channel, and indicates in the DCI of the scheduling TCCH whether to enable the feedback mechanism and feedback method under PTM mode and the corresponding physical cluster feedback channel PTFCH time-frequency resource location. If feedback is supported, the base station will retransmit according to the feedback information. The signaling includes whether the PTP and PTM conversion function is enabled for this group call, the configuration information of the downlink bearer of the cluster group call, the dedicated configuration of the cluster group resources, and optional configuration scheduling related configurations. The optional configurations related to scheduling include configuring the scheduling period, CS-G-RNTI, and the number of HARQ processes used to configure the scheduling method.

9. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method described above, after the trunking terminal completes the relevant configuration for the group call, it answers the group call. The trunking terminal then listens to the PDCCH channel scrambled by the G-RNTI / CS-G-RNTI in the corresponding trunking group search space according to the configuration of the trunking group BWP and the corresponding G-RNTI contained in the paging message and the CS-G-RNTI contained in the group call signaling. At the same time, it determines whether to perform feedback and the feedback method according to the scheduling information of this DCI. If feedback is required, it performs the corresponding feedback according to the feedback method and the PTFCH time-frequency resource location.

10. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 9, characterized in that, In the method, if scheduling information carrying the TTCH channel is received on the channel, the scheduling information is handed over to the cluster HARQ entity for processing; if the TB information of the TTCH is successfully decoded, the correctly decoded MAC PDU is transmitted to the higher layer.

11. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method described above, during multi-beam operation, the base station repeatedly transmits the same cluster-related configuration information, cluster paging messages, cluster service-related signaling, or cluster service data in all transmitted beams. The implementation of the cluster terminal determines which beam to select for receiving the cluster-related configuration information, cluster paging messages, cluster service-related signaling, or cluster service data. The cluster terminal receives the cluster-related configuration information, cluster paging messages, cluster service-related signaling, or cluster service data on the corresponding beam.

12. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 1, characterized in that, In the method, when a request is made to change the group call mode from PTM to PTP or from PTP to PTM, the UE may actively request a dynamic switch or the base station may initiate a dynamic switch.

13. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 11, characterized in that, In the method, if the Channel Quality Status (CQI) received by the UE via PTM mode is lower than the CQI threshold for switching from PTM to PTP or the RSRP value of the UE is lower than the RSRP threshold for switching from PTM to PTP within a certain period of time, the UE actively initiates a group call reception mode conversion request information, requesting the terminal to switch the group call reception mode from PTM to PTP mode. If the UE's Channel Quality Status (CQI) is higher than the CQI threshold for switching from PTP to PTM or the UE's RSRP value is higher than the RSRP threshold for switching from PTP to PTM for a certain period of time, the UE will actively initiate a group call reception mode conversion request, requesting the terminal to switch the group call reception mode from PTP to PTM.

14. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 13, characterized in that, In the method, when the UE actively requests dynamic switching, the UE sends a cluster group reception mode switching request information to the base station. If the UE is in the RRC_IDLE or RRC_INACTIVE state, it first enters the RRC_CONNECTED state and then sends the request information. This information includes: the method the UE expects to receive group calls, the group ID or G-RNTI of the group call the UE is currently receiving, and optionally the most recently received PDCP SN.

15. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 14, characterized in that, In the method, the base station decides whether to switch the UE's reception mode based on the overall load of the cell, the load of the cluster group BWP in the cell, the resource usage of the BWP configured for the UE, the UE's channel quality status, and its location information, and replies to the UE with a response / rejection. In the case of the UE switching from PTM to PTP mode, the base station also includes the configuration information of the separate bearer corresponding to the cluster group call service when replying to the UE.

16. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 15, characterized in that, In the method, if the cluster group receives the mode conversion request information through an RRC reconfiguration message or UE assistance information, the base station responds to the UE through the RRC reconfiguration message. If the cluster group reception mode conversion request information is carried by adding a new cluster group reception mode conversion request message, the base station uses the new cluster group reception mode conversion response message / cluster group reception mode conversion rejection message to reply to the UE.

17. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 11, characterized in that, In the method described above, when the base station initiates a dynamic switching, the base station determines the UE receiving mode based on the overall load of the cell, the load of the cluster group BWP in the cell, the number of terminals in the cell receiving this group call, and the known channel quality status and location information of the UEs receiving the group call, and sends the cluster group receiving mode switching configuration information through RRC dedicated signaling. This information includes: the group number ID or G-RNTI of the group call, the UE's group call reception mode conversion indication, the bearer configuration information corresponding to the converted mode, the optional PDCP SN and the scheduling information of the optional configuration scheduling mode. The UE receives the group call reception mode conversion indication information, performs relevant configuration, sends the configuration completion information back to the base station, and receives the group call signaling and data according to the converted reception mode.

18. The method for implementing trunking group call service transmission based on a 5G trunking communication system according to claim 17, characterized in that, In the method, if the cluster group receiving mode conversion configuration information is carried through an RRC reconfiguration message, the UE replies to the base station through an RRC reconfiguration completion message. If the cluster group reception mode conversion configuration information is carried through a newly added cluster group reception mode conversion message, the UE uses the newly added cluster group reception mode conversion completion message to reply to the base station.

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