CN115706937A

CN115706937A - Cluster group call service transmission realization method and device based on 5G cluster communication system

Info

Publication number: CN115706937A
Application number: CN202110930474.6A
Authority: CN
Inventors: 周欣; 吕征南; 李晓华
Original assignee: Potevio Information Technology Co Ltd
Current assignee: Potevio Information Technology Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2023-02-17

Abstract

The invention discloses a method and a device for realizing cluster group call service transmission based on a 5G cluster communication system, and the method for realizing cluster group call service transmission based on the 5G cluster communication system adds a downlink point-to-multipoint communication mechanism of cluster group call on the basis of a 5G point-to-point communication technology so as to realize the transmission of the cluster group call service. In consideration of enhancing the transmission reliability of the trunking group calling service, a method for the trunking group calling service to simultaneously support PTP and PTM transmission and a method for PTP and PTM dynamic switching in the process of receiving the trunking group calling service by UE are provided. The invention realizes the fast call establishment and air interface transmission of the cluster point-to-multipoint service. The method provides dynamic conversion of the receiving mode of the point-to-multipoint service, can provide dynamic conversion of PTP and PTM modes for the trunking users according to factors such as the channel quality condition of the users, the network load condition and the like, and improves the transmission reliability of the point-to-multipoint service better compared with a B-trunC trunking system.

Description

Cluster group call service transmission realization method and device based on 5G cluster communication system

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for realizing cluster group call service transmission based on a 5G cluster communication system.

Background

The cluster system is a special wireless communication system developed for meeting the demand of industry command and dispatch and applied to various industries, and has wide application markets in public safety, transportation, public utilities, petrochemical industry, industrial and commercial industries and military. With the continuous development of mobile communication technology (such as 5G technology), the trunking system is also developed and evolved to better meet the demands of industrial users on new broadband multimedia trunking services.

The 5G technology not only has a great improvement in bandwidth, capacity, number of users, delay, and reliability, but also has a great change in network architecture and NR air interface transmission technology. The 5G adopts a service network architecture (SBA), uses key technologies such as NFV, SDN and the like to decompose, reconstruct and enhance the 4G EPC network element, disassembles the network element into a Network Function (NF), and realizes the thorough separation of a control plane and a user plane. The 5G technology also adopts a New Radio (NR) design, and compared with 4G LTE, a large amount of technical enhancements and improvements are made, including support of larger carrier bandwidth and better spectrum range, flexible frame structure, diversified parameter sets, novel coding and symbol-level resource scheduling, and the like. On the basis of the existing 5G technology, the characteristics of the trunking service are increased, and the 5G trunking communication system is a development direction of the trunking communication system.

The trunking communication system based on the 5G technology can not only support various multimedia services of the 5G mobile communication system, but also better provide trunking visual basic services and trunking multimedia services, such as visual single call, visual group call, video push to group, video pull-up, pre-occupation priority call, multicast short message, status data, scheduling area selection, environment monitoring, multimedia message services and the like.

The group service is a typical service in a trunking system, and is commonly participated by multiple users, such as a group call service. In order to realize fast call establishment of the trunking group call service, aiming at the characteristic of the point-to-multipoint service, a broadcast mode is generally adopted to send control plane signaling and user plane data based on the downlink of an LTE broadband trunking communication system (such as a B-trunC trunking communication system), and a group call user in an idle state can directly receive the control plane signaling and the user plane data without being converted into a connection state, so that call establishment and service data receiving are accelerated.

In a chinese invention patent document with a patent number CN201110194202.0, a method for transmitting downlink data of a trunking group call service is disclosed, which comprises: after receiving paging control information of a cluster paging control channel TPCCH, user UE monitors a physical downlink control channel PDCCH; the UE descrambles the received PDCCH by using the identifier to obtain downlink authorization information; demultiplexing a media access layer protocol data unit (MAC PDU) obtained according to the downlink authorization information to obtain a cluster group calling logical channel number; and determining the cluster group calling logical channel type according to the cluster group calling logical channel number, and transmitting downlink data in a media access layer service data unit (MAC SDU) corresponding to the cluster group calling logical channel type.

The above patent ensures normal transmission of downlink data, thereby reducing transmission delay of downlink data. But due to the randomness of the location of the cluster group users, efficient reception is generally guaranteed by the cluster group users through a lower MCS level and higher transmit power. Therefore, how to implement the trunking group call service on the basis of 5G becomes a problem that needs to be solved urgently, and therefore a method and a device for implementing trunking group call service transmission based on a 5G trunking communication system are provided herein.

Disclosure of Invention

In order to solve the above problem, an embodiment of the present invention provides a method for implementing group call service transmission based on a 5G trunking communication system, including the following steps:

a base station in the S1G trunking communication system informs trunking paging configuration and trunking BWP configuration information through system information, and a trunking terminal acquires the trunking related system information and completes the related configuration;

s2, when a trunking group calling service exists, the base station selects to use a PTM or a PTM + PTP mode to perform downlink transmission of the trunking group calling service;

s3, when selecting a PTM + PTP mode, receiving signaling and data of the trunking group call service by the PTM for the trunking terminal in RRC _ IDLE, RRC _ INACTIVE and RRC _ CONNECTED states; receiving signaling and data of the trunking group calling service through PTP according to the indication of the base station for the trunking terminal in the RRC _ CONNECTED state;

s4, for the selected PTM + PTP mode, the base station switches the group calling mode from PTM to PTP or from PTP to PTM for the appointed trunking terminal receiving the trunking group calling service according to the set principle.

Further, in the method, the PTMs are specifically:

and the base station issues a cluster paging message to the cluster terminal through the TPCCH according to the configuration. The cluster terminal receives the cluster paging message at the corresponding paging time and carries out related configuration according to the cluster paging message;

after finishing sending the paging message, the base station sends a related signaling for establishing the cluster group call service and group call service data of the cluster group through TCCH and TTCH channels; and the cluster terminal answers the group call by a corresponding channel after finishing the relevant configuration of the group call.

Further, in the method, the trunking paging configuration includes configuration information of a TPCCH channel and configuration information of a trunking paging search space, and is used for the trunking terminal to be able to receive and collect the trunking paging message.

Further, 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

The cluster group downlink BWP configuration comprises BWP position and bandwidth, subcarrier interval, cyclic prefix type, cluster group control resource set, cluster group search space configuration and common PDSCH configuration associated with a cluster group, and is used for a cluster terminal to receive signaling and service data of a collection group;

the cluster group uplink BWP configuration comprises a control resource set corresponding to a BWP position, a bandwidth, a subcarrier interval, a cyclic prefix type and a physical cluster feedback channel PTFCH, and is used for a cluster terminal to transmit feedback information related to a cluster group to a base station.

Furthermore, in the method, the base station issues the trunking paging message to the trunking terminal at the air interface according to the configuration information of the TPCCH channel and the configuration information of the trunking paging search space and according to the trunking paging message sending cycle and the paging time, and the trunking terminal receives the paging message sent by the base station in one trunking paging message sending cycle at the corresponding paging time.

Furthermore, when the trunking group calling service is aimed at and the downlink does not carry out PTP and PTM conversion scenes, the transmission is only carried out in a PTM mode.

Furthermore, in the method, the trunking terminal monitors a PDCCH (physical downlink control channel) scrambled by TP-RNTI (transport protocol-radio network temporary identifier) on trunking paging time-frequency domain resources corresponding to trunking paging;

if receiving the scheduling information of the TPCCH, the cluster terminal decodes the transmission block TB of the TPCCH carried on the PDSCH;

if the TB information of the TPCCH is successfully decoded, the MAC PDU which is correctly decoded is transmitted to the RRC layer, and the RRC layer processes the received trunking paging message.

Furthermore, in the method, if the paging message received by the trunking terminal contains the trunking group number ID to which the trunking terminal belongs and the trunking terminal wants to answer the group call, the trunking terminal monitors the PDCCH scrambled by the 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 meanwhile, determining whether to perform feedback and a feedback mode according to the scheduling information indication of the DCI, and if the feedback is required, performing corresponding feedback according to the feedback mode and the PTFCH time-frequency resource position.

Furthermore, in the method, if the scheduling information carrying the TCCH channel is received on the channel, the scheduling information is submitted to the cluster HARQ entity for processing;

if the TB information of the TCCH is successfully decoded, the MAC PDU which is correctly decoded is transmitted to an RRC layer, the RRC layer processes the received related signaling of the trunking service, establishes a group context, configures the corresponding TCCH and TTCH, generates an SDAP entity, a PDCP entity, an RLC entity and an MAC entity, and establishes a downlink bearer of the group call so as to receive trunking group call service data.

Furthermore, in the method, after sending the paging message of the cluster group, the base station sends a related signaling for establishing the cluster group call service through the TCCH, and indicates whether to start a feedback mechanism and a feedback mode in the PTM mode and a corresponding PTFCH time-frequency resource position of a physical cluster feedback channel in DCI of the scheduling TCCH, and if the feedback is supported, the base station retransmits according to the feedback information.

Furthermore, in the method, the signaling includes whether the group call starts the PTP and PTM conversion function, configuration information of a downlink bearer of the group call, exclusive configuration of group resources, and optionally configuration scheduling related configuration;

the optional configuration scheduling related configuration comprises a configuration scheduling period, a CS-G-RNTI and the number of HARQ processes for configuring the scheduling mode.

Furthermore, in the method, after the trunking terminal completes the relevant configuration of the group call, the trunking terminal answers the group call, and then the trunking terminal monitors 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, the corresponding G-RNTI contained in the paging message and the CS-G-RNTI contained in the group call signaling; and meanwhile, determining whether to perform feedback and a feedback mode according to the scheduling information indication of the DCI, and if the feedback is required, performing corresponding feedback according to the feedback mode and the PTFCH time-frequency resource position.

Furthermore, in the method, if the scheduling information of the channel carrying the TTCH is received on the channel, the scheduling information is submitted to the trunking HARQ entity for processing; if the TB information of the TTCH is successfully decoded, the correctly decoded MAC PDU is transmitted to a higher layer.

Further, in the method, in multi-beam operation, the base station repeatedly transmits the same cluster related configuration information, cluster paging message, cluster service related signaling or cluster service data in all transmitted beams, and the implementation of the cluster terminal determines to select a beam for receiving and collecting the cluster related configuration information, the cluster paging message, the cluster service related signaling or the cluster service data, and the cluster terminal receives the cluster related configuration information, the cluster paging message, the cluster service related signaling or the cluster service data on the corresponding beam.

Furthermore, in the method, when the group calling mode is requested to be switched from the PTM mode to the PTP mode, the UE actively requests dynamic switching or the base station initiates the dynamic switching.

Furthermore, in the method, if the UE receives the group call service with poor effect or the CQI of the channel quality state of the UE is lower than the CQI threshold value converted from the PTM to the PTP or the RSRP value of the UE is lower than the RSRP threshold value converted from the PTM to the PTP in a period of time, the UE actively initiates the switching request information of the cluster group receiving mode, and requests the terminal to receive the group call mode converted from the PTM to the PTP mode;

if the CQI of the UE is higher than the CQI threshold value of the PTP converted PTM or the RSRP value of the UE is higher than the RSRP threshold value of the PTP converted PTM in a period of time, the UE actively initiates the switching request information of the cluster group receiving mode to request the terminal to receive the mode of group calling from the PTP to the PTM.

Furthermore, in the method, when the UE actively requests the dynamic switching, the UE sends the request information of the cluster group receiving mode switching to the base station, and if the UE is in an RRC _ IDLE or RRC _ INACTIVE state, the UE firstly enters an RRC _ CONNECTED state and then sends the request information;

wherein the information comprises: the way the UE expects to receive the group call, the group number ID or G-RNTI that the UE is receiving the group call, optionally the latest received PDCP SN.

Furthermore, in the method, the base station decides whether the UE receiving mode is switched according to the overall load condition of the cell, the load condition of the BWP in the cluster group in the cell, the use condition of the resource corresponding to the BWP configured by the UE, the channel quality status of the UE and the location information thereof, and replies response/rejection to the UE; for the case that the UE is switched from the PTM mode to the PTP mode, when the base station replies the response to the UE, the base station also comprises configuration information of the separated bearer corresponding to the cluster group calling service.

Furthermore, in the method, if the trunking group receiving mode switching request information is carried in the RRC reconfiguration message or the UE auxiliary information, the base station replies a response to the UE through the RRC reconfiguration message;

if the cluster group receiving mode conversion request message is carried by the newly added cluster group receiving mode conversion request message, the base station replies to the UE by using the newly added cluster group receiving mode conversion response message/cluster group receiving mode conversion rejection message.

Furthermore, in the method, when the base station initiates the dynamic switching, the base station determines the UE receiving mode according to the overall load condition of the cell, the load condition of the BWP in the cluster group in the cell, the number of terminals in the cell to answer the group call, the known channel quality state of the UE answering the group call, and the location information of the terminals, and sends the configuration information of the cluster receiving mode switching through the RRC dedicated signaling;

wherein the information comprises: the group number ID or G-RNTI of the group call, the mode conversion indication of the UE receiving the group call, the bearing configuration information corresponding to the converted mode, the optional PDCP SN and the scheduling information of the optional configuration scheduling mode.

Furthermore, in the method, the UE receives the switching indication information of the trunking group receiving mode, performs related configuration, feeds back configuration completion information to the base station, and receives signaling and data of the trunking group call according to the switched receiving mode.

Furthermore, in the method, if the switching configuration information of the cluster group receiving mode is carried by the RRC reconfiguration message, the UE replies to the base station by an RRC reconfiguration complete message;

if the cluster group receiving mode conversion configuration information is carried by the newly added cluster group receiving mode conversion message, the UE replies to the base station by using the newly added cluster group receiving mode conversion completion message.

In another aspect, the present invention provides a device for implementing group call service transmission based on a 5G trunking communication system, which is characterized in that the device comprises a determining module, a sending module, a receiving and updating module and a resetting and rebuilding module; adding logic channel, transmission channel and physical channel;

wherein the logical channels comprise a Trunking Paging Control Channel (TPCCH), a Trunking Control Channel (TCCH) and a trunking control channel (TTCH);

the transmission channel is a cluster paging channel TPCH;

the physical channel is a physical cluster feedback channel PTFCH, and is used to transmit feedback information related to a cluster group.

Further, the MAC indicates radio resource allocation through PDCCH, and RNTI mapped to PDCCH depends on logical channel type.

Further, TP-RNTI (group paging RNTI), CRC for scrambling PDCCH corresponding to TPCCH and scrambling initialization for TPCCH.

Further, G-RNTI (group call RNTI)/CS-G-RNTI (configuration scheduling group call RNTI), CRC for scrambling PDCCH corresponding to TCCH and TTCH, and scrambling initialization for TCCH and TTCH.

Furthermore, the mapping approach of the cluster paging control channel TPCCH is TPCCH-TPCH-PDSCH;

the mapping approach of the cluster control channel TCCH is TCCH-DL-SCH-PDSCH;

and the mapping approach of the cluster service channel TTCH is TTCH-DL-SCH-PDSCH.

Further, a PDCP entity is established for each TDRB at the network side, and the PDCP entity sends duplicated PDCP data packets to a different RLC entity, and is responsible for performing PTM and PTP transmission;

for the initial transmission of the PTM, the PDCP entity simultaneously operates in a PTM mode and a PTP mode, and for the retransmission of the PDCP data packet, the PDCP entity can operate in the PTM mode and/or the PTP mode;

for the PTM mode, point-to-multipoint trunking service data is transmitted for the trunking group on the TTCH channel;

for the PTP mode, the UE designated in the cluster group is transmitted with the point-to-multipoint cluster service data on the DTCH channel.

Further, on the UE side, PTM and/or PTP reception is employed,

for the PTM mode, the UE monitors the PDCCH scrambled by the G-RNTI/CS-G-RNTI to receive the cluster point-to-multipoint service data borne on the TTCH;

for a PTP mode, the UE monitors a PDCCH scrambled by a C-RNTI/CS-RNTI to receive cluster point-to-multipoint service data borne on a DTCH channel;

and the UE side combines and reorders the data of the two independent logical channels on a PDCP layer, detects and discards the data packet redundancy, and provides uplink feedback through a DTCH by using the C-RNTI.

The invention has the beneficial effects that:

aiming at the characteristics of the point-to-multipoint cluster service and the requirements of industrial users, the invention designs a layer two framework supporting the cluster function and an air interface channel mechanism for the cluster point-to-multipoint service (such as group calling) on the basis of a 5G NR air interface technology, thereby realizing the quick call establishment and air interface transmission of the cluster point-to-multipoint service. Meanwhile, the reliability of the cluster point-to-multipoint service is considered, the dynamic conversion of the point-to-multipoint service receiving mode is provided, the PTP and PTM mode dynamic conversion can be provided for cluster users according to the factors of the channel quality condition of the users, the network load condition and the like, and the transmission reliability of the point-to-multipoint service is better improved compared with a B-trunC cluster system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a diagram of a wake-up cycle and a wake-up group according to an embodiment of the present disclosure;

fig. 2 is a wireless frame structure diagram provided in the embodiment of the present application.

Fig. 3 is a downlink channel map provided in an embodiment of the present application;

fig. 4 is an uplink channel map provided in the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or system comprising the element.

Example 1

The embodiment provides a method for realizing cluster group call service transmission based on a 5G cluster communication system, which comprises the following steps:

a base station in the S1G trunking communication system informs trunking paging configuration and trunking BWP configuration information through system information, and a trunking terminal acquires relevant system information of the trunking and completes relevant configuration;

In this embodiment, the PTM method specifically includes:

and the base station transmits cluster paging messages to the cluster terminal through the TPCCH according to the configuration. The cluster terminal receives the cluster paging message at the corresponding paging time and carries out related configuration according to the cluster paging message;

In this embodiment, a cluster function is added on the basis of the existing 5G technology, so that group services such as a cluster group call service, a video push to a group, and a multicast short message are realized.

In this embodiment, for the PTM-based trunking group call service, the UEs in RRC _ IDLE, RRC _ INACTIVE, and RRC _ CONNECTED states may all listen to the group call service.

In this embodiment, in a PTP mode, trunking group call service transmission is for a UE in RRC _ CONNECTED state, a signaling related to trunking group call service is carried through a DCCH channel, trunking group call service data is carried through a DTCH channel, and the UE in RRC _ CONNECTED state monitors a PDCCH scrambled by C-RNTI/CS-RNTI and receives a signaling and data of trunking group call service carried on the DCCH/DTCH channel.

In this embodiment, on the basis of a 5G point-to-point (PTP) communication technology, a communication mechanism of a downstream point-to-multipoint (PTM) of a trunking group call is added to implement transmission of a trunking group call service.

In view of enhancing the transmission reliability of the trunking group call service, the present embodiment provides a method for the trunking group call service to simultaneously support PTP and PTM transmission, and a method for the UE to dynamically switch PTP and PTM in the process of receiving the trunking group call service.

Example 2

In a specific application aspect, the present embodiment provides a method for configuring broadcast cluster group, and the present embodiment is based on a 5G cluster communication system, and first notifies a cluster paging configuration and a configuration of a cluster group BWP through a broadcast message.

The trunking paging configuration of this embodiment includes configuration information of a TPCCH channel and configuration information of a trunking paging search space, and is used for a trunking terminal to receive and collect a trunking paging message.

The configuration of the cluster BWP in this embodiment includes cluster downlink BWP configuration information and cluster uplink BWP configuration information, where the cluster downlink BWP configuration includes BWP position and bandwidth, subcarrier interval, cyclic prefix type, cluster control resource set, cluster search space configuration, and common PDSCH configuration associated with the cluster, and is used for the cluster terminal to receive signaling and service data of the collection cluster.

The cluster group uplink BWP configuration in this embodiment includes a control resource set corresponding to a BWP location, a bandwidth, a subcarrier interval, a cyclic prefix type, and a physical cluster feedback channel PTFCH, and is used for a cluster terminal to transmit feedback information related to a cluster group to a base station.

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

Example 3

In a specific application aspect, this embodiment provides a method for transmitting a trunking paging message at a trunking paging occasion, where a base station in this embodiment issues, according to configuration information of a TPCCH channel and configuration information of a trunking paging search space, a trunking paging message to a trunking terminal on an air interface according to a trunking paging message sending cycle and a paging time, and the trunking terminal receives, at a corresponding paging time, a paging message sent by the base station within a trunking paging message sending cycle.

In a further implementation, for multi-beam operation, the base station repeatedly transmits the same trunking paging message in all transmitted beams, the implementation of the trunking terminal determines the beam selected for receiving the trunking paging message, and the trunking terminal receives the trunking paging message on the corresponding beam.

In this embodiment, the group paging message at least includes a group number ID of the paging group and a corresponding G-RNTI.

In this embodiment, a trunking terminal monitors a PDCCH scrambled by a TP-RNTI on a trunking paging time-frequency domain resource corresponding to trunking paging.

In further implementations, the search spaces are over radio frames, subframes, and time slots, as well as over cluster pages.

In this embodiment, if the 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.

In this embodiment, if the TB information of the TPCCH is successfully decoded, the correctly decoded MAC PDU is transmitted to the RRC layer, and the RRC layer processes the received trunking paging message.

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

Example 4

In the aspect of specific application, this embodiment provides a method for transmitting a signaling for establishing a trunking group call service, where a base station in this embodiment sends a relevant signaling for establishing the trunking group call service through a TCCH channel after sending a paging message of a trunking group, and the signaling includes whether this group call starts a PTP and PTM conversion function, configuration information of a trunking group call downlink bearer, a trunking group resource dedicated configuration, and an optional configuration scheduling relevant configuration.

The configuration scheduling related configuration optionally available in this embodiment includes a configuration scheduling period, a CS-G-RNTI, and the number of HARQ processes for configuring the scheduling method.

In this embodiment, whether to start a feedback mechanism and a feedback mode (NACK feedback only, ACK/NACK feedback) in the PTM mode, and a corresponding time-frequency resource location of the physical cluster feedback channel PTFCH are indicated in the DCI scheduling the TCCH.

In this embodiment, if feedback is supported, the base station performs retransmission according to the feedback information, and the retransmission times are determined by the system.

In this embodiment, if the paging message received by the trunking terminal includes the trunking group number ID to which the trunking terminal belongs, and the trunking terminal desires to answer the group call, the trunking terminal monitors the PDCCH scrambled by the G-RNTI in the corresponding trunking group search space according to the configuration of the trunking group BWP and the corresponding G-RNTI included in the paging message.

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

In this embodiment, if the TB information of the TCCH is decoded successfully, the MAC PDU decoded correctly is transmitted to the RRC layer, and the RRC layer processes the received related signaling of the trunking service, establishes a group context, configures the corresponding TCCH and TTCH, generates a related entity, and establishes a downlink bearer of the group call to receive the trunking group call service data.

Further implementation related entities include an SDAP entity, a PDCP entity, an RLC entity, and a MAC entity.

In this embodiment, the TCCH channel also carries signaling such as release of group call service, notification of speaking right, and the like.

In this embodiment, whether to perform feedback and a feedback mode is determined according to the scheduling information indication of the DCI, and if the feedback is required, corresponding feedback is performed according to the feedback mode and the PTFCH time-frequency resource location.

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

Example 5

In the aspect of specific application, this embodiment provides a method for transmitting trunking group call service data, and after sending a relevant signaling for establishing trunking group call service, a base station in this embodiment sends the group call service data of the trunking group through a TTCH channel.

In this embodiment, whether to start the feedback mechanism and the feedback mode in the PTM mode and the corresponding time-frequency resource location of the physical cluster feedback channel PTFCH are indicated in the DCI of the scheduling TTCH.

In this embodiment, after the trunking terminal completes the relevant configuration of the group call, the trunking terminal answers the group call, and then the trunking terminal monitors the PDCCH scrambled by the G-RNTI/CS-G-RNTI in the corresponding trunking search space according to the configuration of the trunking BWP, the corresponding G-RNTI included in the paging message and the CS-G-RNTI (if any) included in the group call signaling.

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

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

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

Example 6

In the aspect of specific application, the embodiment provides a method for PTP and PTM dynamic switching in a process that UE receives a group call service, including that UE actively requests a dynamic switching mode and a base station initiates the dynamic switching mode.

In this embodiment, when the UE actively requests the dynamic switching mode, the UE sends the switching request information of the cluster group receiving mode to the base station, and if the UE is in the RRC _ IDLE state or the RRC _ INACTIVE state, the UE first enters the RRC _ CONNECTED state and then sends the request information.

The request information of this embodiment includes: the way the UE expects to receive the group call, the group number ID or G-RNTI that the UE is receiving the group call, optionally the latest received PDCP SN.

The request information of this embodiment may be carried in the RRC reconfiguration message, may also be carried in the UE auxiliary information report, and may also be carried by the new added cluster group reception mode conversion request message.

In this embodiment, if the UE receives the group call service with poor effect in a PTM mode in a period of time, or the CQI of the channel quality state of the UE is lower than the CQI threshold value from PTM to PTP, or the RSRP value of the UE is lower than the RSRP threshold value from PTM to PTP, the UE may actively initiate the switching request message of the cluster group receiving mode, and request the terminal to receive the group call mode from PTM to PTP.

In this embodiment, if the CQI of the channel quality state of the UE is higher than the CQI threshold for PTP to PTM or the RSRP value of the UE is higher than the RSRP threshold for PTP to PTM within a period of time, the UE may actively initiate the switching request information of the cluster group receiving mode, and request the terminal to receive the group call mode in a PTP to PTM mode.

In this embodiment, the base station determines whether the UE reception scheme is switched according to the overall load condition of the cell, the load condition of the BWP in the cluster group in the cell, the usage of the resource corresponding to the BWP configured by the UE, the channel quality status of the UE, the location information of the UE, and the like, and replies a response/rejection to the UE.

In this embodiment, for the case that the PTM of the UE is switched to the PTP mode, when the base station replies a response to the UE, the base station further includes configuration information of a separate bearer corresponding to the trunking group call service.

In this embodiment, if the switching request message of the cluster group reception mode is carried in the RRC reconfiguration message or the UE auxiliary message, the base station replies a response to the UE through the RRC reconfiguration message. If the cluster group receiving mode conversion request message is carried by the newly added cluster group receiving mode conversion request message, the base station replies to the UE by using the newly added cluster group receiving mode conversion response message/cluster group receiving mode conversion rejection message.

In this embodiment, when the base station initiates the dynamic switching mode, the base station comprehensively considers to provide a more appropriate UE receiving mode for the UE according to the overall load condition of the cell, the load condition of the BWP in the cluster group in the cell, the number of terminals in the cell to answer the group call, the known channel quality state of the UE answering the group call, and the location information thereof, and sends the cluster receiving mode switching configuration information through the RRC dedicated signaling.

The conversion configuration information of the present embodiment includes: the group number ID or G-RNTI of the group call, the mode conversion indication of the UE receiving the group call, the bearing configuration information corresponding to the converted mode, the optional PDCP SN and the scheduling information of the optional configuration scheduling mode.

The cluster group receiving mode switching configuration information in this embodiment may be carried by an RRC reconfiguration message or an added cluster group receiving mode switching message.

In this embodiment, the UE receives the switching indication information of the cluster group receiving method, performs relevant configuration, and feeds back configuration completion information to the base station. And receiving the signaling and data of the trunking group call according to the converted receiving mode.

In this embodiment, if the cluster group receiving mode switching configuration information is carried by the RRC reconfiguration message, the UE replies to the base station through the RRC reconfiguration complete message.

In this embodiment, if the cluster group receiving mode switching configuration information is carried by the newly added cluster group receiving mode switching message, the UE replies to the base station with the newly added cluster group receiving mode switching completion message.

Example 7

The present embodiment provides a layer two architecture supporting a trunking function, and is based on the layer two architecture supporting the trunking function in a 5G trunking communication system. When a scenario of a group call service is aimed at and a downlink does not perform PTP and PTM switching, transmission is performed only in a PTM manner, and a schematic diagram of a layer two architecture is shown in fig. 1.

In this embodiment, the sounding HARQ in the dashed-line frame in fig. 1 is configurable, and when the network side configures a feedback function for supporting the downlink HARQ of the Trunking group call service in the Trunking group call service, there will be a sounding HARQ in fig. 1, otherwise there is no sounding HARQ.

In this embodiment, a layer two architecture diagram of a trunking group call downlink service, in which PTP and PTM switching is performed in a downlink, is shown in fig. 2, where PTM transmission is mainly used and PTP transmission is used as an auxiliary according to characteristics of trunking point-to-multipoint service.

In this embodiment, the Trunking HARQ in the dashed-line box in fig. 2 is configurable, and when the network side configures a feedback function for supporting the downlink HARQ of the Trunking group call service in the Trunking group call service, there will be the Trunking HARQ in fig. 2, otherwise there is no Trunking HARQ.

In the embodiment, only one PDCP entity (serving all UEs in the set group) is established on the network side for each TDRB, and the PDCP entity sends duplicate PDCP packets to different RLC entities.

The PDCP entity of this embodiment is responsible for performing PTM and PTP transmission, and for PTM initial transmission, the PDCP entity operates in PTM mode and PTP mode simultaneously, and for PDCP packet retransmission, the PDCP entity may operate in PTM mode and/or PTP mode.

For the PTM scheme, this embodiment transmits the point-to-multipoint trunking service data for the trunking group on the TTCH channel.

For the PTP mode, this embodiment transmits the point-to-multipoint trunking service data for the UE designated in the trunking group on the DTCH channel.

In this embodiment, at the UE side, for one TDRB, PTM and/or PTP may be used for reception. For the PTM mode, the UE monitors the PDCCH scrambled by the G-RNTI/CS-G-RNTI to receive the cluster point-to-multipoint service data borne on the TTCH channel.

For the PTP mode, the UE monitors the PDCCH scrambled by the C-RNTI/CS-RNTI to receive the cluster point-to-multipoint service data carried on the DTCH channel.

In this embodiment, since the PDCP SNs of these packets are allocated by one PDCP entity on the network side, the UE combines the data of two independent logical channels on the PDCP layer, reorders, detects and discards the packet redundancy, and provides uplink feedback (i.e., PDCP status report) through DTCH using the C-RNTI.

In this embodiment, for the trunking group call related signaling, the PTM mode is transmitted through the TCCH channel, and the PTP mode is transmitted through the DCCH channel.

Example 8

This embodiment provides a method for channel design supporting a trunking function, which, on the basis of existing 5G NR channel design, in combination with a point-to-multipoint transmission mechanism of an existing 4G LTE trunking system (i.e., a B-TrunC trunking system), adds a new channel for implementing a point-to-multipoint trunking service function in 5G as follows:

referring to fig. 3 and fig. 4, the newly added logical channels in this embodiment include a trunking paging control channel TPCCH, a trunking control channel TCCH, and a trunking control channel TTCH.

The newly added transmission channel in this embodiment includes a trunking paging channel TPCH.

The newly added physical channel in this embodiment includes a physical cluster feedback channel PTFCH, which is used to transmit feedback information related to a cluster group.

The mapping approach of the cluster paging control channel TPCCH of the embodiment is TPCCH-TPCH-PDSCH, and the mapping approach of the cluster control channel TCCH is TCCH-DL-SCH-PDSCH; the mapping approach of the cluster traffic channel TTCH is TTCH-DL-SCH-PDSCH.

In the embodiment, the MAC indicates radio resource allocation through the PDCCH, and the RNTI mapped on the PDCCH depends on the type of the logical channel.

The TP-RNTI (trunking paging RNTI) in this embodiment is used for scrambling CRC of a PDCCH corresponding to a TPCCH and for scrambling initialization of the TPCCH;

in this embodiment, G-RNTI (group call RNTI)/CS-G-RNTI (configuration scheduling group call RNTI) is used for scrambling the CRC of the PDCCH corresponding to the TCCH and TTCH and for scrambling initialization of the TCCH and TTCH.

The cluster control channel TCCH and the cluster service TTCH channel of this embodiment are distinguished by different logical channel numbers (LCIDs) in the air interface layer two protocol.

Example 9

The embodiment provides a device for realizing cluster group call service transmission based on a 5G cluster communication system, which is characterized by comprising a determining module, a sending module, a receiving and updating module and a resetting and rebuilding module; and adding a logical channel, a transmission channel and a physical channel.

In summary, the invention is based on the 5G trunking communication system, and adds the trunking function on the basis of the existing 5G technology, so as to realize the trunking group call service, the group service of video push to the group and multicast short message, etc. On the basis of a 5G point-to-point (PTP) communication technology, a communication mechanism of a cluster group call downlink point-to-multipoint (PTM) is added, so that transmission of a cluster group call service is realized. Meanwhile, in consideration of enhancing the transmission reliability of the trunking group calling service, a method for the trunking group calling service to simultaneously support PTP and PTM transmission and a method for PTP and PTM dynamic conversion in the process of receiving the trunking group calling service by UE are provided.

Aiming at the characteristics of point-to-multipoint clustering service and the requirements of industrial users, the invention designs a layer two framework supporting the clustering function and an air interface channel mechanism for the point-to-multipoint clustering service (such as group calling) on the basis of a 5G NR air interface technology, and realizes the quick call establishment and air interface transmission of the point-to-multipoint clustering service. Meanwhile, the reliability of the cluster point-to-multipoint service is considered, the dynamic conversion of the point-to-multipoint service receiving mode is provided, the PTP and PTM mode dynamic conversion can be provided for cluster users according to the factors of the channel quality condition of the users, the network load condition and the like, and the transmission reliability of the point-to-multipoint service is better improved compared with a B-trunC cluster system.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by adding a necessary general hardware platform, and of course, can also be implemented by a combination of hardware and software. With this understanding in mind, the above-described solutions and/or portions thereof that are prior art may be embodied in the form of a computer program product, which may be embodied on one or more computer-usable storage media having computer-usable program code embodied therein (including but not limited to disk storage, CD-ROM, optical storage, etc.).

The present 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 flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable resource updating apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable resource updating apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable resource updating apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable resource updating apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

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

The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, 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 technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for realizing cluster group call service transmission based on a 5G cluster communication system is characterized by comprising the following steps:

2. The method for implementing group call service transmission based on 5G trunking communication system according to claim 1, wherein in the method, PTM is specifically:

the base station sends a cluster paging message to the cluster terminal through a TPCCH channel according to the configuration, and the cluster terminal receives the cluster paging message at the corresponding paging moment and carries out related configuration according to the cluster paging message;

3. The method of claim 1, wherein in the method, the trunking paging configuration includes configuration information of a TPCCH channel and configuration information of a trunking paging search space, and is used for trunking terminals to receive and collect trunking paging messages.

4. The method according to claim 1, wherein the configuration of the cluster BWP includes cluster downlink BWP configuration information and cluster uplink BWP configuration information; wherein

the cluster group uplink BWP configuration comprises a control resource set corresponding to a BWP position, a bandwidth, a subcarrier interval, a cyclic prefix type and a physical cluster feedback channel PTFCH, and is used for a cluster terminal to transmit cluster group related feedback information to a base station.

5. The method of claim 1, wherein in the method, a base station issues the trunking paging message to the trunking terminal at an air interface according to a trunking paging message sending cycle and a paging moment according to configuration information of a TPCCH channel and configuration information of a trunking paging search space; the trunking terminal receives paging messages sent by a base station in a trunking paging message sending period at corresponding paging moments, and monitors a PDCCH (physical Downlink control channel) scrambled by TP-RNTI (transport protocol-radio network temporary identifier) on trunking paging time-frequency domain resources corresponding to trunking paging;

if receiving the scheduling information of the TPCCH on the channel, the cluster terminal decodes the transmission block TB of the TPCCH carried on the PDSCH channel;

if the TB information of the TPCCH is successfully decoded, the correctly decoded MAC PDU is transmitted to the RRC layer, and the RRC layer processes the received trunking paging message.

6. The method according to claim 5G trunking communication system based trunking group call service transmission implementation method, wherein in the method, if the paging message received by the trunking terminal contains the trunking group number ID to which the trunking terminal belongs and the trunking terminal wants to answer the group call, the trunking terminal monitors the PDCCH scrambled by the 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 meanwhile, determining whether to perform feedback and a feedback mode according to the scheduling information indication of the DCI, and if the feedback is required, performing corresponding feedback according to the feedback mode and the PTFCH time-frequency resource position.

7. The method according to claim 5G trunking communication system based trunking group call service transmission implementation method, wherein in the method, if the scheduling information carrying TCCH channel is received on the channel, the scheduling information is submitted to trunking HARQ entity for processing;

8. The method for implementing transmission of trunking group call service based on 5G trunking communication system of claim 1, wherein in the method, after sending the paging message of trunking group, the base station sends the related signaling for establishing trunking group call service through TCCH channel, and indicates whether to start the feedback mechanism and feedback mode in PTM mode and the corresponding physical trunking feedback channel PTFCH time frequency resource position in DCI of scheduling TCCH, if feedback is supported, the base station retransmits according to the feedback information, wherein the signaling includes whether to start PTP and PTM switching function of this group call, configuration information of trunking group call downlink bearing, dedicated configuration of trunking group resource, optionally configuring scheduling related configuration;

9. The method according to claim 1, wherein after the trunking terminal completes the related configuration of the group call, the trunking terminal listens to the group call, and then the trunking terminal monitors the PDCCH scrambled by the G-RNTI/CS-G-RNTI in the corresponding trunking group search space according to the configuration of the trunking group BWP, the G-RNTI corresponding to the configuration information contained in the paging message, and the CS-G-RNTI contained in the group call signaling; and meanwhile, determining whether to perform feedback and a feedback mode according to the scheduling information indication of the DCI, and if the feedback is required, performing corresponding feedback according to the feedback mode and the PTFCH time-frequency resource position.

10. The method according to claim 9, wherein if the scheduling information carrying TTCH channel is received on the channel, the scheduling information is delivered to the trunking HARQ entity for processing; if the TB information of the TTCH is successfully decoded, the correctly decoded MAC PDU is transmitted to a higher layer.

11. The method according to claim 1, wherein in the multi-beam operation, the base station repeatedly transmits the same trunking related configuration information, trunking paging message, trunking service related signaling, or trunking service data in all transmitted beams, and the implementation of the trunking terminal determines to select a beam for receiving and collecting trunking related configuration information, trunking paging message, trunking service related signaling, or trunking service data, and the trunking terminal receives trunking related configuration information, trunking paging message, trunking service related signaling, or trunking service data on the corresponding beam.

12. The method according to claim 1, wherein when a group call mode is requested to be switched from a PTM mode to a PTP mode or from a PTP to a PTM mode, the UE actively requests the dynamic switching or the base station initiates the dynamic switching.

13. The method of claim 11, wherein if the UE receives a poor group call service in a PTM mode within a period of time, or a channel quality status CQI of the UE is lower than a CQI threshold for a PTM to PTP, or an RSRP value of the UE is lower than an RSRP threshold for a PTM to PTP, the UE actively initiates a group reception mode switching request message requesting the terminal to receive a group call mode from the PTM to the PTP;

14. The method according to claim 13, wherein in the method, when the UE actively requests the dynamic switching, the UE sends a request message for switching the receiving mode of the trunking group to the base station, and if the UE is in an RRC _ IDLE or RRC _ INACTIVE state, the UE first enters an RRC _ CONNECTED state and then sends the request message;

15. The method according to claim 14, wherein the base station decides whether the UE receiving mode is switched according to the overall load condition of the cell, the load condition of the cluster group BWP in the cell, the usage of the resource corresponding to the BWP configured by the UE, the channel quality status of the UE and its location information, and replies response/rejection to the UE; for the case that the UE is switched from the PTM mode to the PTP mode, when the base station replies the response to the UE, the base station also comprises configuration information of the separated bearer corresponding to the cluster group calling service.

16. The method according to claim 15, wherein if the trunking group call service transmission request information is carried in an RRC reconfiguration message or UE assistance information, the base station replies with a response to the UE through the RRC reconfiguration message;

if the cluster group receiving mode conversion request information is carried by the newly added cluster group receiving mode conversion request information, the base station replies to the UE by using the newly added cluster group receiving mode conversion response information/cluster group receiving mode conversion rejection information.

17. The method according to claim 11, wherein when the base station initiates the dynamic switching, the base station determines a UE receiving mode according to an overall load condition of the cell, a load condition of a cluster group BWP in the cell, the number of terminals in the cell to answer the group call, a known channel quality status of UEs answering the group call, and location information thereof, and sends configuration information of cluster group receiving mode switching through RRC dedicated signaling;

wherein the information comprises: the method comprises the steps that group number ID or G-RNTI of group calling, UE receiving group calling mode conversion indication, bearer configuration information corresponding to the converted mode, optional PDCP SN and scheduling information of the optional configuration scheduling mode, the UE receiving cluster group receiving mode conversion indication information, carrying out relevant configuration, feeding configuration completion information back to a base station, and receiving signaling and data of the cluster group calling according to the converted receiving mode.

18. The method of claim 17, wherein if the switching configuration information of the trunking group communication system is carried by the RRC reconfiguration message, the UE replies to the base station by an RRC reconfiguration complete message;

19. A cluster group call service transmission realizing device based on a 5G cluster communication system is characterized by comprising a network side, a UE side, a determining module, a sending module, a receiving updating module and a resetting rebuilding module; adding a logic channel, a transmission channel and a physical channel;

the logic channels comprise a Trunking Paging Control Channel (TPCCH), a Trunking Control Channel (TCCH) and a trunking service channel (TTCH);

the transmission channel is a cluster paging channel TPCH;

20. The apparatus of claim 19, wherein the group call service transmission implementation device is further configured to implement a group call service transmission based on a 5G group communication system,

the mapping way of the cluster paging control channel TPCCH is TPCCH-TPCH-PDSCH;

the mapping approach of the cluster control channel TCCH is TCCH-DL-SCH-PDSCH;

the mapping approach of the cluster traffic channel TTCH is TTCH-DL-SCH-PDSCH.

21. The apparatus of claim 19, wherein a PDCP entity is established for each TDRB on the network side, the PDCP entity sends duplicate PDCP packets to different RLC entities, and the PDCP entity is responsible for PTM and PTP transmission;

for PTM initial transmission, the PDCP entity operates in a PTM mode and a PTP mode simultaneously, and for PDCP data packet retransmission, the PDCP entity can operate in the PTM mode and/or the PTP mode;

for PTM mode, adopting TTCH channel to transmit point-to-multipoint trunking service data for trunking group;

for the PTP mode, point-to-multipoint trunking service data is transmitted for the designated UE in the trunking group on a DTCH channel;

on the UE side, adopting PTM and/or PTP reception,

for the PTM mode, the UE monitors the PDCCH scrambled by the G-RNTI/CS-G-RNTI to receive the cluster point-to-multipoint service data borne on the TTCH channel;

for the PTP mode, the UE monitors the PDCCH scrambled by the C-RNTI/CS-RNTI to receive the cluster point-to-multipoint service data borne on the DTCH;

the UE side combines the data of two independent logic channels on a PDCP layer, reorders the data, detects and discards the data packet redundancy, and provides uplink feedback through a DTCH by using the C-RNTI.