CN116782133A

CN116782133A - MBS session transmitting method in SFN mode in NR system

Info

Publication number: CN116782133A
Application number: CN202210243500.2A
Authority: CN
Inventors: 魏立梅; 范晨; 陈迎; 袁乃华
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2023-09-19

Abstract

The application provides a method for transmitting MBS session in SFN mode in NR system, 5GC generates target information of SFN area according to relevant information of SFN area and transmits the target information to target equipment; the target equipment configures at least one MCH for the SFN area, determines MBS session carried on each MCH, configures one PMCH for each MCH, and determines configuration information of each PMCH; 5GC determines the target session information and then sends the target session information to the target equipment; for each PMCH, the target equipment obtains the data volume information of each MBS session carried on the MCH, schedules the PMCH, and determines the MAC CE of the PMCH in each scheduling period; the gNB determines target cells, in each of which the configuration information of the MCCH of the SFN area is broadcasted, and the DMRS of MCCH, PMCH, PMCH of the SFN area and the PTRS of the PMCH are transmitted.

Description

MBS session transmitting method in SFN mode in NR system

Technical Field

The application relates to the technical field of communication, in particular to a method for transmitting MBS session in SFN mode in NR system.

Background

With the continuous development of wireless communication technology, new Radio Access (NR) systems have been introduced into people's lives. In order to provide Multicast broadcast services (Multicast/Broadcast Service, MBS) in NR cells, work Item (WI) was set up in Release 17, R17 on Release 17 at third generation partnership project (3rd Generation Partnership Project,3GPP) radio access network (Radio Access Network, RAN) panned by 2019 12: NR MBS.

The NR MBS item introduces two transmission modes for MBS sessions: a multicast mode and a broadcast mode for transmitting a multicast session and a broadcast session, respectively. The multicast mode transmits a multicast session To a set of authorized User Equipments (UEs) in a Point-To-Multipoint (PTM) manner and/or a Point-To-Point (PTP) manner, and the UEs that require To receive the multicast session are authenticated and are in a radio resource control Connected state (Radio Resource Control _connected, rrc_connected). The broadcast mode can only transmit one broadcast session in a PTM mode, the broadcast session is transmitted in a certain geographical area, any UE in the geographical area can receive the broadcast session, and the broadcast mode has no limitation on the state of the UE receiving the broadcast session and does not need authentication of the UE.

However, for an MBS session transmitted in multicast/broadcast mode, when the MBS session is transmitted in several cells using the PTM scheme, the scheduling of the MBS session by different cells is independent of each other. Different cells typically transmit the MBS session in PTM using different time-frequency resources. For the UE receiving the MBS session in the PTM manner, the signals of the MBS session from different cells cannot be diversity-combined, resulting in poor reception quality of the MBS session.

Disclosure of Invention

The application provides a method for transmitting MBS session in SFN mode in NR system, which solves the problem of poor receiving quality of MBS session.

In a first aspect, a method for sending an MBS session in an SFN manner in an NR system provided by an embodiment of the present application includes:

the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area and sends the relevant information of the SFN area to the 5GC; wherein, the relevant information of the SFN area comprises:

(1) Identification ID of SFN area;

(2) Cell list of SFN area: the cell list is composed of IDs of cells contained in the SFN area;

(3) First MBS session list of SFN area: for each MBS session transmitted in an SFN area, a first MBS session list provides a Temporary Mobile Group Identification (TMGI) of the MBS session and service Quality (QOS) information of the MBS session;

5GC receives the relevant information of the SFN area sent by the data network;

the 5GC generates target information of the SFN area according to a cell list in the relevant information of the SFN area, and sends the target information of the SFN area to target equipment;

the target equipment receives target information of an SFN area sent by 5GC, configures at least one MCH for the SFN area, determines MBS session carried on each MCH, configures one PMCH for each MCH, and determines configuration information of each PMCH;

The data network transmits the data of each MBS session of the SFN area to 5GC;

the 5GC receives the data of each MBS session of the SFN area sent by the data network, determines target session information according to the data of each MBS session of the SFN area, and sends the target session information to target equipment, wherein the target session information is used for the target equipment to schedule the data of each MBS session;

the target device receives the target session information sent by the 5GC, obtains data volume information of each MBS session carried on an MCH corresponding to the PMCH from the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, and determines MBS scheduling information (MAC CE) of the PMCH in each scheduling period;

the gNB corresponding to each cell in a cell list of target information of the SFN area determines a target cell belonging to the SFN area in cells controlled by the gNB according to the cell list;

the gNB broadcasts the configuration information of the MCCH of the SFN area through a dedicated SIB of the SFN in each target cell, and transmits the MCCH of the SFN area, wherein the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area;

In each target cell, aiming at each PMCH, the gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to the PMCH layer by layer; in each scheduling period of the PMCH, the gNB determines S TBs sent by the PMCH in the scheduling period and an MCS adopted by each TB according to MBS scheduling information MAC CE of the PMCH in the scheduling period, where the gNB sends the S TBs in S x R x N PMCH slots before occupation in the scheduling period of the PMCH, determines, according to a subscript of a mapping manner of a slot and a beam in the scheduling period in configuration information of the PMCH, a TB sent by the PMCH in each occupied PMCH slot, and sends the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

In an implementation manner of the first aspect, the receiving, by the target device, target information of the SFN area sent by the 5GC, configuring at least one MCH for the SFN area, determining an MBS session carried on each MCH, configuring one PMCH for each MCH, and determining configuration information of each PMCH includes:

the target device allocates at least one MBS Channel (MCH) to MBS sessions in a first MBS session list of the SFN area, determines MBS sessions borne on each MCH, and the MCH is a transmission Channel special for the SFN area;

For each MCH, the target device determines configuration information of SDAP entity of each MBS session carried on the MCH;

the target equipment determines configuration information of a packet data convergence protocol PDCP entity corresponding to each MRB of each MBS session and configuration information of a radio link control protocol RLC entity, and allocates an ID to an MBS service channel MTCH corresponding to each MRB;

the target equipment configures a PMCH for each MCH, and each MCH is mapped to the configured PMCH;

the target equipment allocates a periodically-occurring PMCH resource pool to each PMCH;

for each PMCH, the target device determines a scheduling period of the PMCH, and determines a subscript of a mapping mode of a time slot and a wave beam in the scheduling period; configuring at least one MCS for the PMCH, and determining the repeated transmission times of each TB and the wave beam adopted when each TB is transmitted; configuring the PMCH with a set of parameters for performing physical layer related processing on the bit sequence mapped onto the PMCH; determining the DMRS configuration information of the PMCH, wherein the DMRS configuration information of the PMCH is used for generating a DMRS sequence of the PMCH and mapping the DMRS sequence to corresponding time-frequency resources; determining PTRS configuration information of the PMCH, wherein the PTRS configuration information of the PMCH is used for generating a PTRS sequence of the PMCH and mapping the PTRS sequence to corresponding time-frequency resources; determining a scheduling strategy of the PMCH and configuration information related to the scheduling strategy;

The target device generates configuration information of each PMCH, wherein the configuration information of each PMCH comprises:

(2) A second MBS session list;

the second MBS session list gives the ID of each MBS session carried on the MCH corresponding to the PMCH;

for each MBS session, the second MBS session list gives configuration information of the SDAP entity of the MBS session, said configuration information being used to configure the MBS session with one SDAP entity in order to map QOS flows of the MBS session onto 1 or more MRBs;

for each MRB of each MBS session, the second MBS session list gives configuration information of PDCP entity and configuration information of RLC entity of the MRB of the MBS session, the configuration information of PDCP/RLC entity of the MRB of the MBS session is used for configuring the PDCP/RLC entity of the MRB of the MBS session;

for each MRB of each MBS session, the second MBS session list gives the ID of the MTCH to which the MRB of the MBS session corresponds;

(2) PMCH resource pool configuration information: a period P of the resource pool, a starting radio frame offset SysFNOFFSET of the resource pool in each period, a starting time slot subscript TSOFFSET, time slot configuration information of the PMCH resource pool in each period, time domain resource configuration information of the PMCH resource pool in each PMCH time slot and frequency domain resource configuration information of the PMCH resource pool in each PMCH time slot;

(3) A scheduling period of the PMCH, and subscripts of a mapping mode of time slots and beams in the scheduling period;

(4) At least one MCS adopted by the PMCH, the repeated transmission times R of each TB and N wave beams adopted when each TB transmits;

(5) A group of parameters adopted by the PMCH, configuration information of a demodulation reference number (DMRS) of the PMCH and configuration information of a Phase Tracking Reference Signal (PTRS) of the PMCH;

(6) Scheduling policy of PMCH and configuration information related to scheduling policy.

In an implementation manner of the first aspect, the determining, by the target device, time domain resource configuration information in PMCH resource pool configuration information includes:

the target equipment configures an SFN time slot for the SFN area, and configures an SFN interval for the SFN time slot, wherein the SFN interval configured for the SFN time slot consists of a plurality of continuous OFDM symbols in the SFN time slot, and the SFN time slot configured for the SFN area consists of partial downlink time slots of carrier frequencies adopted by each cell in the SFN area;

for each PMCH of the SFN area, a periodically occurring resource pool is configured for the PMCH in the SFN time slot configured for the SFN area, wherein in each period, the resource pool is composed of a plurality of SFN time slots, and each PMCH adopts a set of continuous OFDM symbols indicated by the SFN interval when each SFN time slot is transmitted.

In an implementation manner of the first aspect, the determining, by the target device, DMRS configuration information of the PMCH and PTRS configuration information of the PMCH in PMCH resource pool configuration information includes:

for each PMCH, the target device configures DMRS and PTRS for the PMCH in an SFN interval in each SFN time slot used by the PMCH, determines the DMRS/PTRS configuration information of the PMCH, and the target device configures the DMRS/PTRS for different PMCHs independently.

In an implementation manner of the first aspect, the determining, by the target device, frequency resource configuration information in PMCH resource pool configuration information includes:

the target device configures a unique common frequency resource CFR for the SFN area, wherein the CFR is composed of a group of continuous CRBs in the bandwidth of a carrier frequency used by the SFN area, and the target device determines configuration information of the CFR: subcarrier spacing adopted by CFR, CP type, starting position of CRB occupied by CFR and CRB number;

for each PMCH of the SFN area, the frequency resource employed in transmitting each PMCH slot is the frequency resource indicated by the CFR of the SFN area.

In an implementation manner of the first aspect, for a PMCH, a mapping manner of a time slot and a beam in the scheduling period includes:

In each scheduling period, starting from 0 and giving the available PMCH time slot number contained in the scheduling period to the PMCH according to a time sequence, if the MCCH exists in the current scheduling period, the PMCH time slot occupied by the MCCH is an unavailable PMCH time slot, and when the available PMCH time slot number contained in the current scheduling period is the available PMCH time slot number, excluding the time slot occupied by the MCCH;

for the PMCH, S represents the number of TBs from an MBS session on the MCH corresponding to the PMCH in the current scheduling period, R represents the number of repeated transmissions of each TB in the PMCH configuration information, N represents the number of beams used when each TB is transmitted in the PMCH configuration information, and then the PMCH occupies the previous s×r×n slots in the current scheduling period to transmit the S TBs, and t=f (S, R, N) represents the mapping manner between the slots and the beams in the scheduling period, where t=f (S, R, N) is a function that gives the subscript t of the PMCH slot used when the S TB on the MCH is transmitted for the R-th time by adopting the beam N, where s=1, … …, S; r=1, … …, R; n=1, … …, N;

if the function t=f (s, r, n) has a plurality of forms, a subscript is assigned to each form, and the function t=f (s, r, n) can be uniquely determined according to the subscript of the mapping manner between the time slots and the beams in the scheduling period.

In an implementation manner of the first aspect, in each target cell, for each PMCH, the gNB performs layer-by-layer processing on data of each MBS session carried on a MCH corresponding to the PMCH by using a corresponding protocol stack, where the processing includes:

the gNB configures an SDAP entity for each MBS session carried on the MCH corresponding to the PMCH according to the configuration information of the PMCH, configures a PDCP entity and an RLC entity for each MRB of each MBS session, and configures an ID for each MTCH corresponding to each MRB of each MBS session;

the gNB executes SDAP layer, PDCP layer and RLC layer processing to the data of each MBS session;

for each MBS session, the gNB processes the data of the MBS session through an SDAP entity of the MBS session and maps the data of each QOS flow of the MBS session to one MRB of the MBS session; the PDCP entity of each MRB processes the data on the MRB, generates PDCP PDU, and transmits the PDCP PDU to the RLC entity of the MRB through the corresponding RLC channel; the RLC entity of the MRB processes the PDCP PDU on the RLC channel to generate an RLC PDU, and transmits the RLC PDU to the MAC layer of the cell through the MTCH of the MRB;

for each scheduling period of the PMCH, the gNB performs a processing of a MAC layer;

For each scheduling period of the PMCH, the gNB generates S TBs from RLC PDUs on each MTCH of each MBS session on the MCH corresponding to the PMCH according to the MBS scheduling information MAC CE of the scheduling period, and determines an MCS adopted by each TB, where the gNB transmits the S TBs and the MCS adopted by each TB to a physical layer;

for each scheduling period of the PMCH, the gNB performs a physical layer processing;

for each scheduling period of the PMCH, the gNB sends the S TBs by occupying s×r×n PMCH slots in the scheduling period according to the number R of repeated sending of each TB in the PMCH configuration information and N beams adopted when sending each TB, and determines, according to the subscript of the mapping manner between the slots and the beams in the scheduling period in the PMCH configuration information, the TBs sent through the PMCH in each occupied PMCH slot and the beams adopted when sending the PMCH, and sends the PMCH, the DMRS of the PMCH and the PTRS of the PMCH in each occupied PMCH slot.

In an implementation manner of the first aspect, when the target device is a unique gNB corresponding to a cell in a cell list in the relevant information of the SFN area, the generating, by the 5GC, target information of the SFN area according to the cell list in the relevant information of the SFN area, and sending the target information of the SFN area to the target device includes:

The 5GC determines a gNB corresponding to the cell list according to the cell list in the relevant information of the SFN area, determines the relevant information of the SFN area as target information of the SFN area, and sends the target information to the gNB;

correspondingly, the target device receives target information of the SFN area sent by the 5GC, configures at least one MCH for the SFN area, determines MBS sessions carried on each MCH, configures one PMCH for each MCH, and determines configuration information of each PMCH, including:

the gNB receives target information of the SFN area sent by the 5GC, when the target information does not contain a gNB list, at least one MCH is configured for the SFN area, MBS session carried on each MCH is determined, a PMCH is configured for each MCH, and configuration information of each PMCH is determined;

correspondingly, the 5GC receives the data of each MBS session of the SFN area sent by the data network, determines target session information according to the data of each MBS session of the SFN area, and sends the target session information to a target device, including:

the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session to the gNB as target session information;

Correspondingly, the target device receives the target session information sent by the 5GC, and for each PMCH, the target device obtains, from the target session information, data amount information of each MBS session carried on an MCH corresponding to the PMCH, schedules the PMCH in each scheduling period of the PMCH, and determines MBS scheduling information MAC CE of the PMCH in each scheduling period, including:

and the target equipment receives the target session information sent by the 5GC, and for each PMCH, the gNB obtains the data volume information of each MBS session carried on the MCH corresponding to the PMCH from the target session information, schedules the PMCH in each scheduling period of the PMCH, and determines MBS scheduling information MAC CE of the PMCH in each scheduling period.

In an implementation manner of the first aspect, when the target device is each gNB corresponding to a cell in the cell list in the relevant information of the SFN area, the 5GC generates target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

the 5GC determines gNB corresponding to each cell in a cell list in the relevant information of the SFN area, determines a main gNB and a plurality of auxiliary gNB, and generates a first gNB list, wherein the first gNB list comprises the identification of the main gNB and the identification of each auxiliary gNB; 5GC adds the first gNB list to the relevant information of the SFN area, generates target information of the SFN area, and sends the target information of the SFN area to each gNB included in the first gNB list;

each gNB receives target information of the SFN area sent by 5GC, when the target information of the SFN area received by the gNB comprises a first gNB list and the gNB is a main gNB in the first gNB list, the gNB configures at least one MCH for the SFN area, MBS session borne on each MCH is determined, each MCH is configured with one PMCH, configuration information of each PMCH is determined, and the gNB transmits the configuration information of each PMCH to each auxiliary gNB through an Xn interface between each auxiliary gNB according to the first gNB list; when the target information of the SFN area received by the gNB comprises a first gNB list and the gNB is an auxiliary gNB in the first gNB list, the gNB receives configuration information of each PMCH sent by the main gNB through an Xn interface;

The 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session to each gNB as target session information;

each gNB receives the target session information sent by the 5GC, when the gNB is a main gNB, the gNB obtains the data volume information of each MBS session carried on the MCH corresponding to the PMCH by the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, determines MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period to each auxiliary gNB through an Xn interface between the MBS scheduling information MAC CE and each auxiliary gNB; and when the gNB is an auxiliary gNB, the gNB receives MBS scheduling information (MAC CE) of each PMCH in each scheduling period, which is sent by the main gNB, through an Xn interface.

the 5GC determines gNB corresponding to each cell in a cell list in the relevant information of the SFN area, and generates a second gNB list, wherein the second gNB list comprises identifiers of corresponding gNB; 5GC adds the second gNB list to the relevant information of the SFN area, generates target information of the SFN area, and sends the target information of the SFN area to each gNB included in the second gNB list;

each gNB receives target information of the SFN area sent by the 5GC, and when the target information of the SFN area contains a second gNB list, each gNB determines whether the gNB is a main gNB according to a preset rule; when the gNB determines itself as a main gNB, at least one MCH is configured for the SFN area, MBS session carried on each MCH is determined, one PMCH is configured for each MCH, configuration information of each PMCH is determined, and the configuration information of each PMCH is transmitted to each auxiliary gNB through an Xn interface between each auxiliary gNB according to a second gNB list; when the gNB determines that the gNB is an auxiliary gNB, the gNB receives configuration information of each PMCH sent by the main gNB through an Xn interface;

the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session to each gNB included in a second gNB list as target session information;

In an implementation manner of the first aspect, when the target device is 1 or more multi-cell coordination entities MCEs corresponding to cells in a cell list in the relevant information of the SFN area, the 5GC generates target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

the 5GC determines the relevant information of the SFN area as target information of the SFN area, and sends the target information of the SFN area to a corresponding MCE;

each MCE receives target information of the SFN area sent by 5GC, configures at least one MCH for the SFN area, determines MBS session carried on each MCH, configures one PMCH for each MCH, determines configuration information of each PMCH, then determines each gNB belonging to the SFN area in gNB connected with the MCE according to a cell list in the target information of the SFN area, and transmits the target information of the SFN area and the configuration information of each PMCH to each gNB;

the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session of the SFN area to a corresponding MCE as target session information;

each MCE receives the target session information sent by the 5GC, and for each PMCH, the MCE obtains, from the target session information, data amount information of each MBS session carried on the MCH corresponding to the PMCH, schedules the PMCH in each scheduling period of the PMCH, determines an MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period and the target session information to each gNB.

each MCE receives target information of an SFN area sent by the 5GC, configures at least one MCH for the SFN area, determines an MBS session carried on each MCH, configures one PMCH for each MCH, determines configuration information of each PMCH, then determines each gNB belonging to the SFN area from among the gnbs connected to itself according to a cell list in the target information of the SFN area, and transmits the target information of the SFN and the configuration information of each PMCH to each gNB;

the 5GC receives the data of each MBS session of the SFN area sent by the data network, acquires the data quantity information of each MBS session of the SFN area from the data of each MBS session of the SFN area, transmits the data quantity information of each MBS session as target session information to a corresponding MCE, determines a gNB corresponding to a cell in a cell list in the relevant information of the SFN area in a gNB connected with the gNB, and transmits the data of each MBS session of the SFN area to the corresponding gNB;

each MCE receives the target session information sent by the 5GC, and for each PMCH, the MCE obtains, from the target session information, data amount information of each MBS session carried on the MCH corresponding to the PMCH, schedules the PMCH in each scheduling period of the PMCH, determines MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period to each gNB.

In a second aspect, a transmission system for MBS session in SFN mode in an NR system provided by an embodiment of the present application includes:

a data network, a 5 th generation core network 5GC, a target device, and a 5G base station gNB;

the data network is used for determining an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generating relevant information of the SFN area and sending the relevant information of the SFN area to the 5GC;

wherein, the relevant information of the SFN area comprises:

(1) Identification ID of SFN area;

(3) First MBS session list of SFN area: for each MBS session transmitted within the SFN area, a first MBS session list provides a temporary mobile group identity (Temporary Mobile Group Identity, TMGI) of the MBS session and quality of service (Quality of Service, QOS) information of the MBS session;

the 5GC is used for receiving the relevant information of the SFN area sent by the data network;

the 5GC is further configured to generate target information of the SFN area according to a cell list in the relevant information of the SFN area, and send the target information of the SFN area to a target device;

The target device is used for receiving target information of an SFN area sent by the 5GC, configuring at least one MCH for the SFN area, determining MBS session carried on each MCH, configuring one PMCH for each MCH, and determining configuration information of each PMCH;

the data network is also used for transmitting the data of each MBS session of the SFN area to the 5GC;

the 5GC is further configured to receive data of each MBS session in the SFN area sent by the data network, determine target session information according to the data of each MBS session in the SFN area, and send the target session information to a target device, where the target session information is used for the target device to schedule the data of each MBS session;

the target device is further configured to receive the target session information sent by the 5GC, obtain, for each PMCH, data volume information of each MBS session carried on a MCH corresponding to the PMCH by the target session information, schedule the PMCH in each scheduling period of the PMCH, and determine MBS scheduling information MAC CE of the PMCH in each scheduling period;

the gNB corresponding to each cell in the cell list of the target information of the SFN area is also used for determining the target cell belonging to the SFN area in the self-controlled cells according to the cell list;

The gNB is also used for broadcasting the configuration information of the MCCH of the SFN area through a SIB special for the SFN in each target cell, and sending the MCCH of the SFN area, wherein the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area;

in each target cell, for each PMCH, the gNB is further configured to use a corresponding protocol stack to perform layer-by-layer processing on data of each MBS session carried on the MCH corresponding to the PMCH; in each scheduling period of the PMCH, the gNB determines S TBs sent by the PMCH in the scheduling period and an MCS adopted by each TB according to MBS scheduling information MAC CE of the PMCH in the scheduling period, the gNB sends the S TBs in the scheduling period of the PMCH by occupying s×r×n PMCH time slots before the PMCH occupies the scheduling period, determines a TB sent by the PMCH in each occupied PMCH time slot according to a subscript of a mapping manner of a time slot and a beam in the scheduling period in configuration information of the PMCH, and sends the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH time slot.

The embodiment of the application provides a method for transmitting MBS session in an SFN mode in an NR system, wherein 5GC generates target information of an SFN area according to relevant information of the SFN area and transmits the target information to target equipment; the target equipment configures at least one MCH for the SFN area, determines MBS session carried on each MCH, configures one PMCH for each MCH, and determines configuration information of each PMCH; 5GC determines the target session information and then sends the target session information to the target equipment; for each PMCH, the target equipment obtains the data volume information of each MBS session carried on the MCH, schedules the PMCH, and determines the MAC CE of the PMCH in each scheduling period; the gNB determines target cells, in each target cell, broadcasts the configuration information of MCCH of the SFN area, and sends the DMRS of MCCH, PMCH, PMCH of the SFN area and the PTRS of PMCH, so that the receiving quality of MBS session can be effectively improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic diagram of a transmission path of an MBS session in an NR system according to an embodiment of the present application;

fig. 2 is a flowchart of an embodiment one of a method for transmitting an MBS session in an SFN manner in an NR system according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a second embodiment of a method for transmitting an MBS session in an SFN manner in an NR system according to the present application;

fig. 4 is a schematic flow chart of a third embodiment of a method for transmitting an MBS session in an SFN manner in an NR system according to the present application;

fig. 5 is a flow chart of a fourth embodiment of a method for transmitting an MBS session in an SFN manner in an NR system according to the present application;

fig. 6 is a flowchart of a fifth embodiment of a method for transmitting an MBS session in an SFN manner in an NR system according to the present application;

fig. 7 is a flowchart of a sixth embodiment of a method for transmitting an MBS session in an SFN manner in an NR system according to the present application;

fig. 8 is a flowchart of a transmission method embodiment seven of an MBS session in an SFN manner in an NR system according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a protocol stack embodiment of an embodiment of the present application;

fig. 10 is a schematic structural diagram of a transmission system of an MBS session in an SFN mode in an NR system according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Before describing the embodiments of the present application, an application background of the embodiments of the present application will be explained first:

fig. 1 is a schematic diagram of transmission paths of MBS sessions in an NR system according to an embodiment of the present application. As shown in fig. 1, the NR system includes a data network, a 5 th generation core network (5G Core Network,5GC), a next generation radio access network (Next Generation Radio Access Network, NG-RAN), and User Equipment (UE). In the NR system, the data network provides each MBS session and transmits the data of the MBS session to the 5GC, and the 5GC transmits the MBS session to the NG-RAN, which transmits the MBS session to the UE through the air interface. Alternatively, the NG-RAN may also be denoted as gNB, which is a base station of the NR cell.

For MBS sessions transmitted in multicast/broadcast mode, when the MBS session is transmitted in a number of cells by PTM, the scheduling of the MBS session by different cells is independent from each other. Different cells typically transmit the MBS session in PTM using different time-frequency resources. For the UE receiving the MBS session in the PTM manner, the signals of the MBS session from different cells cannot be diversity-combined, resulting in poor reception quality of the MBS session.

In order to solve the above problems, an embodiment of the present application provides a method for transmitting an MBS session in a single frequency network (Single Frequence Network, SFN) manner in an NR system. In the application, in the NR system of the same-frequency networking, for MBS session which is simultaneously transmitted by each cell in a zone, the MBS session is transmitted in a PTM mode by adopting SFN, and at the same time, each cell adopts the same time-frequency resource to transmit the data of the same MBS session in a PTM mode, so as to generate the same MBS signal. For the UE receiving the MBS session in the PTM manner, the signals of the MBS session from different cells are multipath signals of the same signal, and diversity combining may be performed, thereby improving the reception quality of the MBS session.

The technical scheme of the application is described in detail through specific embodiments.

It should be noted that the following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

Fig. 2 is a flowchart of an embodiment one of a method for transmitting an MBS session in an SFN manner in an NR system according to an embodiment of the present application. As shown in fig. 2, the method for transmitting an MBS session in SFN mode in the NR system may include the following steps:

s21, the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area, and sends the relevant information of the SFN area to the 5GC.

Wherein, the relevant information of the SFN area comprises:

(1) Identification ID of SFN area;

(3) First MBS session list of SFN area: for each MBS session transmitted within the SFN area, a first MBS session list provides temporary mobile group identification (Temporary Mobile Group Identity, TMGI) for the MBS session and quality of service (Quality of Service, QOS) information for the MBS session. Optionally, for each MBS session, the first MBS session list may also provide other necessary information of the MBS session, which may be determined according to the actual situation, which is not specifically limited in the embodiment of the present application. For example, for each MBS Session, the first MBS Session list may also provide a Session identification (Session ID) for the MBS Session.

Alternatively, the SFN area may be composed of a plurality of cells that are geographically continuously distributed among cells controlled by one gNB, or may be composed of a plurality of cells that are geographically continuously distributed among cells controlled by a plurality of gnbs that are interconnected through an Xn interface.

The data network may determine one SFN area according to a deployment scenario of one or more MBS sessions, and may determine multiple SFN areas according to a deployment scenario of multiple MBS sessions. In the embodiment of the application, the data network determines one SFN area according to the deployment scene of MBS session as an example for specific explanation, and when a plurality of SFN areas exist, the processing mode of each SFN area is consistent with the processing mode of one SFN area, and the details are not repeated here.

S22, 5GC receives the relevant information of the SFN area sent by the data network.

S23, the 5GC generates target information of the SFN area according to a cell list in the relevant information of the SFN area, and sends the target information of the SFN area to target equipment.

S24, the target equipment receives target information of an SFN area sent by 5GC, configures at least one MBS Channel (MCH) for the SFN area, determines MBS session carried on each MCH, configures one physical MBS Channel (Physical MBS Channel, PMCH) for each MCH, and determines configuration information of each PMCH.

The MCH is a transmission channel special for the SFN area, and the PMCH is a physical channel special for the SFN area.

And S25, the data network transmits the data of each MBS session of the SFN area to the 5GC.

S26, the 5GC receives the data of each MBS session of the SFN area sent by the data network, determines target session information according to the data of each MBS session of the SFN area, and sends the target session information to target equipment.

The target session information is used for scheduling the data of each MBS session by the target equipment.

And S27, the target equipment receives the target session information sent by the 5GC, obtains the data quantity information of each MBS session carried on the MCH corresponding to the PMCH from the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, and determines MBS scheduling information MAC CE of the PMCH in each scheduling period.

In this step, for each PMCH, the target device first obtains, from the target session information, data size information of each MBS session carried on the MCH corresponding to the PMCH, and then schedules the PMCH in each scheduling period of the PMCH, and generates, from the scheduling result, MBS scheduling information MAC CE of the PMCH in each scheduling period. The process of scheduling PMCH in each scheduling period and generating MBS scheduling information MAC CE of the scheduling period is not the content of the present application and will not be described in detail.

S28, determining a target cell belonging to the SFN area in the self-controlled cells according to the cell list by gNB corresponding to each cell in the cell list of the target information of the SFN area;

in one implementation, an operation administration and maintenance (Operation Administration and Maintenance, OAM) system configures a group of cells to the gNB, each identified by a cell ID. These cells are the cells controlled by the gNB. After the gNB receives the target information of the SFN area, the gNB determines the cells belonging to the SFN area from the cells controlled by the gNB according to the cell list in the target information of the SFN area, and the cells are target cells.

S29, the gNB broadcasts configuration information of an MBS control channel (MBS Control Channel, MCCH) of the SFN area through a system information block (System Information Block, SIB) dedicated to the SFN in each target cell, and sends the MCCH of the SFN area, where the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area.

Optionally, the gNB may also broadcast other necessary information of the SFN area through SIBs dedicated to the SFN.

The detailed method of broadcasting the configuration information of the MCCH of the SFN area and other necessary information of the SFN area through one SIB dedicated to the SFN in each target cell is not the content of the present application, and how to send the MCCH of the SFN area is not the content of the present application, which is not repeated here.

S210, in each target cell, aiming at each PMCH, the gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to the PMCH layer by layer; in each scheduling period of the PMCH, the gNB determines S TBs sent by the PMCH in the scheduling period and an MCS adopted by each TB according to MBS scheduling information MAC CE of the PMCH in the scheduling period, where the gNB sends the S TBs in S x R x N PMCH slots before occupation in the scheduling period of the PMCH, determines, according to a subscript of a mapping manner of a slot and a beam in the scheduling period in configuration information of the PMCH, a TB sent by the PMCH in each occupied PMCH slot, and sends the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

In the method for transmitting an MBS session in an SFN manner in an NR system provided in the first embodiment of the present application, corresponding processing is performed by a data network, a 5GC, a target device, and a gNB corresponding to each cell in a cell list of target information of the SFN area, so that the problem of transmitting an MBS session in an SFN manner in an NR system is solved.

Fig. 3 is a schematic flow chart of a second embodiment of a method for transmitting an MBS session in an SFN mode in an NR system according to an embodiment of the present application. As shown in fig. 3, the second embodiment is a specific implementation manner of the method for transmitting an MBS session in the SFN mode in the NR system described in the first embodiment, that is: when the target device in the first embodiment is the only one gNB corresponding to the cell in the cell list in the relevant information of the SFN area, and the target session information in the first embodiment is the data of each MBS session of the SFN area, the method in the first embodiment may be specifically implemented by the second embodiment. As shown in fig. 3, a specific implementation procedure of a second embodiment of a method for transmitting an MBS session in an SFN manner in an NR system provided by the embodiment of the present application is as follows:

S31, the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area, and sends the relevant information of the SFN area to the 5GC.

And S32, 5GC receives the relevant information of the SFN area sent by the data network.

S33, the 5GC determines a unique gNB corresponding to the cell list according to the cell list in the relevant information of the SFN area, determines the relevant information of the SFN area as target information of the SFN area, and sends the target information to the gNB.

In this step, the only one gNB corresponding to the cell in the cell list in the relevant information of the SFN area is the target device in the first embodiment.

S34, the gNB receives target information of the SFN area sent by the 5GC, when the target information does not contain a gNB list, at least one MCH is configured for the SFN area, MBS session carried on each MCH is determined, a PMCH is configured for each MCH, and configuration information of each PMCH is determined.

And S35, the data network transmits the data of each MBS session of the SFN area to the 5GC.

S36, the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session to the gNB as target session information.

In this step, the only one gNB corresponding to the cell in the cell list in the relevant information of the SFN area is the target device in the first embodiment, and the data of each MBS session of the SFN area is the target session information in the first embodiment.

And S37, the gNB receives the target session information sent by the 5GC, obtains the data volume information of each MBS session carried on the MCH corresponding to the PMCH by the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, and determines MBS scheduling information MAC CE of the PMCH in each scheduling period.

S38, the gNB determines a target cell belonging to the SFN area in the self-controlled cells according to the cell list;

and S39, broadcasting the configuration information of the MCCH of the SFN area in each target cell through a SIB special for the SFN, and transmitting the MCCH of the SFN area, wherein the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area.

S310, in each target cell, aiming at each PMCH, the gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to the PMCH layer by layer; in each scheduling period of the PMCH, the gNB determines S TBs sent by the PMCH in the scheduling period and an MCS adopted by each TB according to MBS scheduling information MAC CE of the PMCH in the scheduling period, where the gNB sends the S TBs in S x R x N PMCH slots before occupation in the scheduling period of the PMCH, determines, according to a subscript of a mapping manner of a slot and a beam in the scheduling period in configuration information of the PMCH, a TB sent by the PMCH in each occupied PMCH slot, and sends the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

Fig. 4 is a flow chart of a third embodiment of a method for transmitting an MBS session in an SFN mode in an NR system according to the present application. As shown in fig. 4, the third embodiment is a specific implementation manner of the method for transmitting an MBS session in the SFN mode in the NR system described in the first embodiment, that is: when the target device in the first embodiment is each gNB corresponding to a cell in the cell list in the relevant information of the SFN area, and the target session information in the first embodiment is data of each MBS session of the SFN area, the method in the first embodiment may be specifically implemented by the third embodiment. As shown in fig. 4, the specific implementation steps of the third embodiment of the method for transmitting an MBS session in SFN mode in the NR system provided by the embodiment of the present application are as follows:

s41, the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area, and sends the relevant information of the SFN area to the 5GC.

And S42, 5GC receives the relevant information of the SFN area sent by the data network.

S43, the 5GC determines gNB corresponding to each cell in a cell list in the relevant information of the SFN area, determines a main gNB and a plurality of auxiliary gNB, and generates a first gNB list, wherein the first gNB list comprises identification of the main gNB and identification of each auxiliary gNB; and 5GC adds the first gNB list to the relevant information of the SFN area, generates target information of the SFN area, and sends the target information of the SFN area to each gNB included in the first gNB list.

In this step, each gNB corresponding to the cell list corresponds to the target device in the first embodiment.

S44, each gNB receives target information of the SFN area sent by 5GC, when the target information of the SFN area received by the gNB comprises a first gNB list and the gNB is a main gNB in the first gNB list, the gNB configures at least one MCH for the SFN area, MBS session borne on each MCH is determined, each MCH is configured with a PMCH, configuration information of each PMCH is determined, and the gNB transmits the configuration information of each PMCH to each auxiliary gNB through an Xn interface between each auxiliary gNB according to the first gNB list; when the target information of the SFN area received by the gNB comprises a first gNB list and the gNB is an auxiliary gNB in the first gNB list, the gNB receives configuration information of each PMCH sent by the main gNB through an Xn interface.

S45, the data network transmits the data of each MBS session of the SFN area to the 5GC.

S46, the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session to each gNB as target session information.

In this step, each gNB corresponding to the cell list corresponds to the target device in embodiment one, and the data of each MBS session of the SFN area corresponds to the target session information in embodiment one.

S47, each gNB receives the target session information sent by the 5GC, when the gNB is a main gNB, the gNB obtains data volume information of each MBS session carried on an MCH corresponding to the PMCH by the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, determines MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period to each auxiliary gNB through an Xn interface between the MBS scheduling information MAC CE and each auxiliary gNB; and when the gNB is an auxiliary gNB, the gNB receives MBS scheduling information (MAC CE) of each PMCH in each scheduling period, which is sent by the main gNB, through an Xn interface.

S48, each gNB determines a target cell belonging to the SFN area in the cells controlled by the gNB according to the target information cell list of the SFN area.

And S49, broadcasting the configuration information of the MCCH of the SFN area through a SIB special for the SFN in each determined target cell by each gNB, and transmitting the MCCH of the SFN area, wherein the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area.

S410, each gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to each PMCH layer by layer in each determined target cell aiming at each PMCH; in each scheduling period of the PMCH, determining S TBs sent through the PMCH and an MCS adopted by each TB in the scheduling period according to MBS scheduling information MAC CE of the PMCH in the scheduling period, wherein the S TBs are sent by s×r×n PMCH slots before occupation in the scheduling period of the PMCH, determining a TB sent through the PMCH in each occupied PMCH slot according to a subscript of a mapping mode of a slot and a beam in the scheduling period in configuration information of the PMCH, and sending the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

Fig. 5 is a flow chart of a fourth embodiment of a method for transmitting an MBS session in an SFN mode in an NR system according to the present application. As shown in fig. 5, the fourth embodiment is a specific implementation manner of the method for transmitting an MBS session in the SFN mode in the NR system described in the first embodiment, that is: when the target device in the first embodiment is each gNB corresponding to a cell in the cell list in the relevant information of the SFN area, each gNB determines itself to be a primary gNB or a secondary gNB, and the target session information is data of each MBS session of the SFN area, the method described in the first embodiment may be specifically implemented by the fourth embodiment. As shown in fig. 5, a specific implementation procedure of a fourth embodiment of a method for transmitting an MBS session in an SFN manner in an NR system provided by the embodiment of the present application is as follows:

s51, the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area, and sends the relevant information of the SFN area to the 5GC.

And S52, 5GC receives the relevant information of the SFN area sent by the data network.

S53, the 5GC determines gNB corresponding to each cell in the cell list in the relevant information of the SFN area, and generates a second gNB list, wherein the second gNB list comprises identifiers of the corresponding gNB; and the 5GC adds the second gNB list to the relevant information of the SFN area, generates target information of the SFN area, and sends the target information of the SFN area to each gNB included in the second gNB list.

In this step, each gNB corresponding to the cell list in the relevant information of the SFN area corresponds to the target device in the first embodiment.

S54, each gNB receives target information of the SFN area sent by the 5GC, and when the target information of the SFN area contains a second gNB list, each gNB determines whether the gNB is a master gNB according to a preset rule; when the gNB determines itself as a main gNB, at least one MCH is configured for the SFN area, MBS session carried on each MCH is determined, one PMCH is configured for each MCH, configuration information of each PMCH is determined, and the configuration information of each PMCH is transmitted to each auxiliary gNB through an Xn interface between each auxiliary gNB according to a second gNB list; and when the gNB determines that the gNB is an auxiliary gNB, the gNB receives configuration information of each PMCH sent by the main gNB through an Xn interface.

The preset rule may be set when the gNB establishes an Xn interface with each other gNB. For example: and a plurality of gNBs are interconnected, and support to transmit one MBS session in an SFN mode, and the priority value of each gNB is preset in the gNBs. The Priority value of the G-th gNB is denoted by Priority (G), g=1, …, G being the total number of interconnected gnbs. The Priority (g) is a non-negative integer, and the value range is as follows: 0,1, … …, G-1. Different gnbs have different priority values, the smaller the priority value of one gNB, the higher the priority of that gNB. The priority values of the gnbs may be preset by an Operation/Administration/Maintenance (OAM) system, a gNB priority list is generated, the ID and the priority value of each gNB are given in the list, and then the list is configured for each gNB. The gNB determines whether the gNB itself is a main gNB according to the priority value of the gNB itself and the priority values of other gNBs in the gNB list: when the priority value of the gNB is minimum, the gNB determines the gNB as a main gNB; otherwise, the gNB determines itself as a secondary gNB.

And S55, the data network transmits the data of each MBS session of the SFN area to the 5GC.

And S56, the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session to each gNB included in a second gNB list as target session information.

In this step, each gNB corresponding to the cell list in the relevant information of the SFN area corresponds to the target device in embodiment one, and the data of each MBS session of the SFN area corresponds to the target session information in embodiment one.

S57, each gNB receives the target session information sent by the 5GC, when the gNB is a main gNB, the gNB obtains data volume information of each MBS session carried on the MCH corresponding to the PMCH by the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, determines MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period to each auxiliary gNB through an Xn interface between the MBS scheduling information MAC CE and each auxiliary gNB; and when the gNB is an auxiliary gNB, the gNB receives MBS scheduling information (MAC CE) of each PMCH in each scheduling period, which is sent by the main gNB, through an Xn interface.

And S58, each gNB determines a target cell belonging to the SFN area in the self-controlled cells according to the target information cell list of the SFN area.

S59, each gNB broadcasts configuration information of MCCH of the SFN area through a SIB special for SFN in each determined target cell, and sends the MCCH of the SFN area, wherein the MCCH of the SFN area carries configuration information of each PMCH of the SFN area.

S510, each gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to each PMCH layer by layer in each determined target cell aiming at each PMCH; in each scheduling period of the PMCH, determining S TBs sent through the PMCH and an MCS adopted by each TB in the scheduling period according to MBS scheduling information MAC CE of the PMCH in the scheduling period, wherein the S TBs are sent by s×r×n PMCH slots before occupation in the scheduling period of the PMCH, determining a TB sent through the PMCH in each occupied PMCH slot according to a subscript of a mapping mode of a slot and a beam in the scheduling period in configuration information of the PMCH, and sending the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

Fig. 6 is a flowchart of an embodiment five of a method for transmitting an MBS session in an SFN manner in an NR system according to an embodiment of the present application. As shown in fig. 6, the fifth embodiment is a specific implementation manner of the method for transmitting an MBS session in the SFN mode in the NR system described in the first embodiment, that is: when the target device in the first embodiment is 1 or more Multi-cell coordination entities (Multi-cell Coordination Entity, MCE) corresponding to cells in a cell list in the relevant information of the SFN area, and the target session information is data of each MBS session of the SFN area, the method in the first embodiment may be specifically implemented by the fifth embodiment. As shown in fig. 6, the specific implementation steps of the fifth embodiment of the method for transmitting an MBS session in SFN mode in the NR system provided by the embodiment of the present application are as follows:

s61, the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area, and sends the relevant information of the SFN area to the 5GC.

And S62, 5GC receives the relevant information of the SFN area sent by the data network.

And S63, the 5GC determines the relevant information of the SFN area as target information of the SFN area, and sends the target information of the SFN area to a corresponding MCE.

When the 5GC is connected to only one MCE, the 5GC transmits the target information of the SFN area to the MCE. When the 5GC is connected with a plurality of MCEs, the 5GC determines the MCEs corresponding to the cells according to the cell list in the relevant information of the SFN area, and the target information of the SFN area is transmitted to the corresponding MCEs.

In this step, the MCE corresponding to the cell in the cell list in the relevant information of the SFN area corresponds to the target device in the first embodiment.

S64, each MCE receives target information of the SFN area sent by 5GC, configures at least one MCH for the SFN area, determines MBS session carried on each MCH, configures one PMCH for each MCH, determines configuration information of each PMCH, then determines each gNB belonging to the SFN area in gNB connected with the MCE according to a cell list in the target information of the SFN area, and transmits the target information of the SFN area and the configuration information of each PMCH to each gNB.

S65, the data network transmits the data of each MBS session of the SFN area to the 5GC.

And S66, the 5GC receives the data of each MBS session of the SFN area sent by the data network, and transmits the data of each MBS session of the SFN area to the corresponding MCE as target session information.

In this step, the MCE corresponds to the target device in the first embodiment, and the data of each MBS session of the SFN area corresponds to the target session information in the first embodiment.

S67, each MCE receives the target session information sent by the 5GC, obtains the data volume information of each MBS session carried on the MCH corresponding to the PMCH from the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, determines the MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period and the target session information to each gNB.

And S68, each gNB determines a target cell belonging to the SFN area in the self-controlled cells according to the target information cell list of the SFN area.

And S69, broadcasting the configuration information of the MCCH of the SFN area through a SIB special for the SFN in each determined target cell by each gNB, and transmitting the MCCH of the SFN area, wherein the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area.

S610, each gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to each PMCH layer by layer in each determined target cell aiming at each PMCH; in each scheduling period of the PMCH, determining S TBs sent through the PMCH and an MCS adopted by each TB in the scheduling period according to MBS scheduling information MAC CE of the PMCH in the scheduling period, wherein the S TBs are sent by s×r×n PMCH slots before occupation in the scheduling period of the PMCH, determining a TB sent through the PMCH in each occupied PMCH slot according to a subscript of a mapping mode of a slot and a beam in the scheduling period in configuration information of the PMCH, and sending the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

Fig. 7 is a flowchart of a sixth embodiment of a method for transmitting an MBS session in an SFN manner in an NR system according to an embodiment of the present application. As shown in fig. 7, the sixth embodiment is a specific implementation manner of the method for transmitting an MBS session in the SFN mode in the NR system described in the first embodiment, that is: when the target device in the first embodiment is an MCE and the target session information is data size information of each MBS session of the SFN area, the method described in the first embodiment may be specifically implemented by the sixth embodiment. As shown in fig. 7, the specific implementation steps of the sixth embodiment of the method for transmitting an MBS session in SFN mode in the NR system provided by the embodiment of the present application are as follows:

and S71, the data network determines an SFN area and each MBS session transmitted in the SFN area according to the deployment scene of the MBS session, generates relevant information of the SFN area, and sends the relevant information of the SFN area to the 5GC.

And S72, 5GC receives the relevant information of the SFN area sent by the data network.

And S73, the 5GC determines the relevant information of the SFN area as target information of the SFN area, and sends the target information of the SFN area to a corresponding MCE.

In this step, the MCE corresponds to the target device in the first embodiment.

S74, each MCE receives target information of the SFN area sent by the 5GC, configures at least one MCH for the SFN area, determines MBS session carried on each MCH, configures one PMCH for each MCH, determines configuration information of each PMCH, then determines each gNB belonging to the SFN area in gNB connected with the MCE according to a cell list in the target information of the SFN area, and transmits the target information of the SFN area and the configuration information of each PMCH to each gNB.

And S75, the data network transmits the data of each MBS session of the SFN area to the 5GC.

S76, the 5GC receives the data of each MBS session of the SFN area sent by the data network, acquires the data volume information of each MBS session of the SFN area from the data of each MBS session of the SFN area, transmits the data volume information of each MBS session as target session information to a corresponding MCE, determines a gNB corresponding to a cell in a cell list in the relevant information of the SFN area in a gNB connected with the gNB, and transmits the data of each MBS session of the SFN area to the corresponding gNB.

In this step, the MCE corresponds to the target device in the first embodiment, and the data amount information of each MBS session in the SFN area corresponds to the target session information in the first embodiment. The 5GC transmits the target session information to the target device and simultaneously transmits the data of each MBS session of the SFN area to each gNB.

And S77, each MCE receives the target session information sent by the 5GC, obtains the data volume information of each MBS session carried on the MCH corresponding to the PMCH from the target session information for each PMCH, schedules the PMCH in each scheduling period of the PMCH, determines the MBS scheduling information MAC CE of the PMCH in each scheduling period, and transmits the MBS scheduling information MAC CE of each PMCH in each scheduling period to each gNB.

And S78, each gNB determines a target cell belonging to the SFN area in the self-controlled cells according to the target information cell list of the SFN area.

S79, each gNB broadcasts the configuration information of the MCCH of the SFN area through a SIB special for the SFN in each determined target cell, and transmits the MCCH of the SFN area, wherein the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area.

S710, each gNB adopts a corresponding protocol stack to process the data of each MBS session carried on the MCH corresponding to each PMCH layer by layer in each determined target cell aiming at each PMCH; in each scheduling period of the PMCH, determining S TBs sent through the PMCH and an MCS adopted by each TB in the scheduling period according to MBS scheduling information MAC CE of the PMCH in the scheduling period, wherein the S TBs are sent by s×r×n PMCH slots before occupation in the scheduling period of the PMCH, determining a TB sent through the PMCH in each occupied PMCH slot according to a subscript of a mapping mode of a slot and a beam in the scheduling period in configuration information of the PMCH, and sending the PMCH, DMRS of the PMCH, and PTRS of the PMCH in each occupied PMCH slot.

In summary, for an MBS session transmitted in a PTM manner in each cell, the present application provides the above six embodiments in order to solve the problem that in the prior art, the UE cannot diversity combine signals of the MBS session from different cells.

The processing performed by the gNB in the various embodiments described above may be implemented jointly by a gNB Central Unit (gNB Central Unit, gNB-CU) and a gNB distribution Unit (gNB Distributed Unit, gNB-DU). Specifically, when the function of the gNB is implemented by the gNB-CU and the gNB-DU, in the above embodiment, when the 5GC or MCE transmits the related information to the gNB, the 5GC or MCE actually transmits the related information to the gNB-CU.

In the above embodiment, the radio resource control (Radio Resource Control, RRC) layer, the service data adaptation protocol (Service Data Adaptation Protocol, SDAP) layer, and the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer-related processes among the functions performed by the gNB are implemented by the gNB-CU, and the radio link control (Radio Link Control, RLC) layer, the medium access control (Media Access Control, MAC) layer, and the physical layer-related processes among the functions performed by the gNB are implemented by the gNB-DU.

Fig. 8 is a flowchart of an embodiment seventh of a method for transmitting an MBS session in an SFN manner in an NR system according to an embodiment of the present application. As shown in fig. 8, on the basis of any of the foregoing embodiments, the target device receives target information of the SFN area sent by the 5GC, configures at least one MCH for the SFN area, determines an MBS session carried on each MCH, configures one PMCH for each MCH, and determines configuration information of each PMCH, which may be implemented by the following steps:

S81, the target equipment allocates at least one MBS Channel (MCH) to MBS sessions in a first MBS session list of the SFN area, determines MBS sessions borne on each MCH, and the MCH is a transmission Channel special for the SFN area;

s82, for each MCH, the target equipment determines configuration information of SDAP entity of each MBS session carried on the MCH;

configuration information of an SDAP entity of an MBS session is used for configuring the MBS session with the SDAP entity, and the SDAP entity maps QOS flows of the MBS session to 1 or more MBS Radio Bearers (MRB);

s83, the target equipment determines configuration information of a packet data convergence protocol PDCP entity and configuration information of a radio link control protocol RLC entity corresponding to each MRB of each MBS session, and allocates an ID to an MBS service channel MTCH corresponding to each MRB;

the configuration information of the PDCP entity of each MRB of each MBS session is used for configuring one PDCP entity for the MRB of the MBS session; the configuration information of the RLC entity of each MRB of each MBS session is used to configure one RLC entity for the MRB of the MBS session. Each MRB of each MBS session corresponds to one MTCH, and the target device needs to configure an ID for the MTCH corresponding to each MRB of each MBS session, for identifying the MTCH corresponding to the MRB of the MBS session.

S84, configuring a PMCH for each MCH by the target equipment, wherein each MCH is mapped to the configured PMCH;

s85, the target equipment allocates a periodically-occurring PMCH resource pool to each PMCH;

s86, aiming at each PMCH, the target equipment determines the scheduling period of the PMCH and determines the subscript of the mapping mode of the time slot and the wave beam in the scheduling period; configuring at least one MCS for the PMCH, and determining the repeated transmission times of each TB and the wave beam adopted when each TB is transmitted; configuring the PMCH with a set of parameters for performing physical layer related processing on the bit sequence mapped onto the PMCH; determining the DMRS configuration information of the PMCH, wherein the DMRS configuration information of the PMCH is used for generating a DMRS sequence of the PMCH and mapping the DMRS sequence to corresponding time-frequency resources; determining PTRS configuration information of the PMCH, wherein the PTRS configuration information of the PMCH is used for generating a PTRS sequence of the PMCH and mapping the PTRS sequence to corresponding time-frequency resources; and determining the scheduling strategy of the PMCH and configuration information related to the scheduling strategy.

For each PMCH, the scheduling period T of the PMCH is an integer multiple of the period P of the PMCH resource pool, and the target equipment dynamically schedules resources in the PMCH resource pool by taking T/P periods as a unit and is used for transmitting MBS session data borne on the MCH corresponding to the PMCH; wherein T and P are both positive numbers greater than 0; the units of T and P are: a radio frame.

And configuring at least one MCS for the PMCH, which is used for carrying out channel coding and modulation on the TB of the MBS session on the MCH corresponding to the PMCH, and determining the repeated transmission times of each TB and the wave beam adopted when each TB is transmitted.

For each PMCH, when the PMCH is scheduled in units of a scheduling period, a different scheduling policy may be adopted. The parameters adopted by the gNB in scheduling the PMCH under different scheduling strategies are not identical. Therefore, the gNB needs to determine a scheduling policy to be used when scheduling PMCH, and configuration information related to the scheduling policy.

S87, the target equipment generates configuration information of each PMCH.

The configuration information of one PMCH includes:

(3) Second MBS session list

The second MBS session list gives the IDs of the respective MBS sessions carried on the MCHs corresponding to the PMCH: the ID of an MBS Session can only comprise the temporary mobile group identifier TMGI of the MBS Session, and can also comprise the TMGI and the Session identifier Session ID of the MBS Session;

(3) Subscript of PMCH scheduling period, mapping mode of time slot and wave beam in scheduling period

(4) At least one MCS adopted by PMCH, the repeated transmission times R of each TB, N wave beams adopted when each TB is transmitted

(5) A set of parameters adopted by the PMCH, configuration information of demodulation reference number (Demodulation Reference Signal, DMRS) of the PMCH and configuration information of phase tracking reference signal (Phase Tracking Reference Signal, PTRS) of the PMCH

(6) Scheduling policy of PMCH and configuration information related to scheduling policy

In this embodiment, the gNB configures MCH for each MBS session according to the QOS requirement and other information of each MBS session provided in the first MBS session list, and determines the MBS session carried on each MCH, where each MBS session can be carried only through one MCH. Different types of MBS sessions have different QOS requirements, and gNB can configure one MCH for each type of MBS session, so that different types of MBS sessions are carried by different MCH. The gNB may also configure one MCH for multiple types of MBS sessions, such that these types of MBS sessions are carried over the same MCH. The present embodiment does not limit the method of configuring the MCH by the gNB.

For each MCH, gNB allocates periodically occurring resource pools to PMCH corresponding to the MCH according to QOS requirements of each MBS session carried on the MCH, and the resource pools of different PMCHs are not overlapped. The periods of the resource pools of different PMCHs may be the same or different.

When periodically occurring resource pools are configured for each PMCH, the gNB may first configure a total periodically occurring resource pool, then divide the total resource pool into a plurality of sub-resource pools, and allocate one sub-resource pool to each PMCH. Of course, the gNB may also configure each PMCH with a periodically occurring resource pool, respectively.

For each PMCH, determining a resource pool of the PMCH according to the PMCH resource pool configuration information according to the following method:

in each period, the frame number SysFN of the starting radio frame of the PMCH resource pool satisfies the following formula, and the subscript of the starting time slot is TSOFFSET.

SysFN MOD P＝SFNOFFSET

The number of downlink slots for transmitting PMCH, which the PMCH resource pool contains in each period, is denoted by Duration. If each downlink timeslot starting from the starting timeslot in each period is used for PMCH transmission, the timeslot configuration information of the PMCH resource pool in each period includes: duration. If not every downlink slot starting from the starting slot is used for PMCH transmission in every period, the slot configuration information of the PMCH resource pool in every period includes: w and a bit sequence of length W. Specifically, the number of downlink slots included in the PMCH resource pool in each period is denoted by W, the downlink slots are numbered in time sequence from 0, and a bit mapping sequence with a length of W is used to indicate slots used for PMCH transmission in the slots: starting from the most important bit, W bits in the bit map sequence correspond to time slots 0 to W-1 respectively, and if the corresponding bit is 1, the corresponding time slot is indicated to be used for PMCH transmission, and the number of bits with the value of 1 in the bit map sequence is Duration.

Representing a time slot for transmitting a PMCH by using a PMCH time slot, wherein time domain resource allocation information of a PMCH resource pool in each PMCH time slot is used for indicating a group of continuous symbols for PMCH transmission in the PMCH time slot; the frequency domain resource allocation information of the PMCH resource pool in each PMCH slot is used to indicate a subcarrier spacing, a Cyclic Prefix (CP) type, and a set of consecutive common resource blocks (Common Resource Block, CRB) for PMCH transmission, which are employed when transmitting PMCH in the PMCH slot.

Specifically, for one SFN area, each PMCH is transmitted in a different slot. Preferably, the time domain resources adopted by each PMCH in each PMCH slot transmission are the same, namely: each PMCH employs the same set of OFDM symbols during the time slot in which each PMCH is transmitted. Preferably, each PMCH adopts the same frequency domain resource when transmitting in each PMCH slot, namely: within the time slot in which each PMCH is transmitted, each PMCH employs the same subcarrier spacing, the same CP type, and the same CRB resource.

Preferably, the target device configures an SFN time slot for the SFN area, and configures an SFN interval for the SFN time slot, wherein the SFN interval configured for the SFN time slot is composed of a plurality of continuous OFDM symbols in the SFN time slot, and the SFN time slot configured for the SFN area is composed of a part of downlink time slots of carrier frequencies adopted by each cell in the SFN area. For each PMCH of the SFN area, a periodically occurring resource pool is configured for the PMCH in the SFN time slot configured for the SFN area, wherein in each period, the resource pool is composed of a plurality of SFN time slots, and each PMCH adopts a set of continuous OFDM symbols indicated by the SFN interval when each SFN time slot is transmitted.

Preferably, for each PMCH, the target device configures DMRS and PTRS for the PMCH in the SFN area in each SFN slot used by the PMCH, and determines DMR/PTRS configuration information of the PMCH. The DMRS/PTRS configured by the target device for different PMCHs are independent of each other.

Preferably, the target device configures the SFN area with a unique one of common frequency resources (Common Frequency Resource, CFR), the CFR being composed of a set of consecutive CRBs in a bandwidth of a carrier frequency used by the SFN area, and the target device determines configuration information of the CFR: subcarrier spacing adopted by CFR, CP type, starting position of CRB occupied by CFR and CRB number. For each PMCH of the SFN area, the frequency resource employed in transmitting each PMCH slot is the frequency resource indicated by the CFR of the SFN area.

For a PMCH, the mapping manner of the time slot and the beam in each scheduling period is defined as follows: first, in each scheduling period, the available PMCH slots contained in the scheduling period are numbered in time series to the PMCH starting from 0. If the MCCH exists in the current scheduling period, the PMCH time slot occupied by the MCCH is an unavailable PMCH time slot, and when the available PMCH time slot number is contained in the current scheduling period, the time slot occupied by the MCCH is excluded.

For the PMCH, S represents the number of TBs from an MBS session on the MCH corresponding to the PMCH in the current scheduling period, R represents the number of repeated transmissions of each TB in the PMCH configuration information, N represents the number of beams used when each TB is transmitted in the PMCH configuration information, and then the PMCH occupies the previous s×r×n slots to transmit the S TBs in the current scheduling period. The mapping manner between the time slots and the beams in the scheduling period is represented by a function t=f (S, r, n) which gives the subscript t of the PMCH time slot used when the mth TB on the MCH is transmitted for the mth r time using the beam n, where s=1, … …, S; r=1, … …, R; n=1, … …, N.

Specifically, PMCH is transmitted using a single layer, single antenna port, and using the same N beams when each cell is transmitting. The beam in which PMCH is transmitted in each cell is typically different from the beam in which the intra-cell synchronization signal/physical broadcast channel BLOCK SS/PBCH BLOCK is transmitted.

Optionally, when determining the mapping manner between the time slots and the beams in the scheduling period, each cell uses 1 omni-directional beam to transmit PMCH, and uses appropriate transmit power when transmitting PMCH, so as to make the coverage of PMCH equal to the coverage of cell MIB/SIB 1/other SIBs/PAGING as much as possible. Namely: optionally, in the mapping manner between the time slot and the beam in the scheduling period, n=1, each cell transmitting the PMCH adopts one omni-directional beam to transmit the PMCH, and appropriately determines the transmitting power of the PMCH, so as to ensure that the coverage area of the PMCH is equal to the coverage area of MIB/SIB 1/other SIBs/PAGING of the cell.

Fig. 9 is a schematic diagram of a protocol stack embodiment according to an embodiment of the present application. As shown in fig. 9, in S210/S310/S410/S510/S610/S710, for each PMCH, the protocol stack shown in fig. 9 is used to perform layer-by-layer processing on the data of each MBS session carried on the MCH corresponding to the PMCH. Specifically, for each PMCH, the process of performing layer-by-layer processing on the data of each MBS session carried on the MCH corresponding to the PMCH by using the protocol stack shown in fig. 9 includes the following steps:

s91, gNB configures an SDAP entity for each MBS session carried on the MCH corresponding to the PMCH according to the configuration information of the PMCH, configures a PDCP entity and an RLC entity for each MRB of each MBS session, and configures an ID for each MTCH corresponding to each MRB of each MBS session.

Specifically, the present step may be implemented by:

(1) Configuring an SDAP entity for each MBS session, wherein the SDAP entity is used for mapping QOS flows of the corresponding MBS session to 1 or more MRBs;

(2) For each MBS session, configuring a PDCP entity and an RLC entity for each MRB of the MBS session, and configuring an ID for an MTCH corresponding to each MRB.

S92, the gNB performs processing of the SDAP layer, PDCP layer, and RLC layer on data of each MBS session.

For each MBS session, the data for that MBS session consists of data on the individual QOS flows for that MBS session. The gNB processes the data of the MBS session through the SDAP entity of the MBS session and maps the data of each QOS flow of the MBS session to one MRB of the MBS session. The PDCP entity of each MRB processes the data on the MRB, generates PDCP PDU, and transmits the PDCP PDU to the RLC entity of the MRB through the corresponding RLC channel. The RLC entity of the MRB processes PDCP PDUs on the RLC channel, generates RLC PDUs, and transmits the RLC PDUs to the MAC layer of the cell through the MTCH of the MRB. Preferably, each MRB employs RLC entities in unacknowledged mode (Unacknowledged Mode, UM) mode.

S93, the gNB executes processing of the MAC layer for each scheduling period of the PMCH.

For each scheduling period of the PMCH, gNB generates S TBs from RLC PDUs on each MTCH of each MBS session on the MCH corresponding to the PMCH according to MBS scheduling information MAC CE of the scheduling period, determines MCS adopted by each TB, and transmits the S TBs and the MCS adopted by each TB to a physical layer; .

Specifically, the process of generating S TBs from the MBS scheduling information MAC CE of one scheduling period and determining the MCS adopted by each TB is not the content of the present application, and will not be described in detail.

S94, the gNB executes the physical layer processing for each scheduling period of the PMCH.

For each scheduling period of the PMCH, the gNB sends the S TBs according to the number R of repeated sending of each TB in the PMCH configuration information and the N beams adopted when each TB is sent, and occupies the first s×r×n PMCH timeslots in the scheduling period, and the gNB determines, according to the subscript of the mapping manner of the timeslots and the beams in the scheduling period in the PMCH configuration information, the TBs sent through the PMCH in each occupied PMCH timeslot and the beams adopted when sending the PMCH, and sends the PMCH, the DMRS of the PMCH, and the PTRS of the PMCH in each occupied PMCH timeslot.

And in each occupied PMCH time slot, carrying out channel coding and modulation on a TB transmitted through the PMCH by adopting a corresponding MCS, carrying out physical layer related processing on a bit sequence mapped to the PMCH according to a group of parameters configured for the PMCH in the PMCH configuration information, transmitting the PMCH by adopting time domain resources indicated by time domain resource configuration information in the PMCH configuration information and frequency domain resources indicated by frequency domain resource configuration information in the PMCH configuration information, transmitting the DMRS of the PMCH according to the DMRS configuration information of the PMCH in the PMCH configuration information, and transmitting the PTRS of the PMCH according to the PTRS configuration information of the PMCH in the PMCH configuration information.

For each TB, the process of channel coding and modulating the TB using a corresponding MCS is not the content of the present application and will not be described herein.

When each occupied PMCH slot transmits the PMCH, how to perform physical layer related processing on the bit sequence mapped on the PMCH is not the content of the present application, and will not be described in detail.

When each occupied PMCH timeslot transmits the PMCH, how to generate the DMRS sequence of the PMCH and how to map the generated DMRS sequence to the corresponding time-frequency resource is not the content of the present application, and will not be described again.

When each occupied PMCH timeslot transmits the PMCH, how to generate the PTRS sequence of the PMCH and how to map the generated PTRS sequence to the corresponding time-frequency resource is not the content of the present application, and will not be described again.

In the method described in the above application, the transport channel and the physical channel for transmitting the MBS session are indicated by MCH and PMCH, respectively. Of course, the DL-SCH and PDSCH may also be used as transport channels and physical channels, respectively, for MBS sessions. However, if DL-SCH/PDSCH is used as a transport channel/physical channel of an MBS session transmitted in SFN, physical layer processing performed by DL-SCH/PDSCH needs to be specifically defined to adapt to the MBS session transmitted in SFN.

Fig. 10 is a schematic structural diagram of a transmission system of an MBS session in an SFN mode in an NR system according to an embodiment of the present application. As shown in fig. 10, the transmission system of the MBS session in SFN mode in the NR system includes:

data network 101,5GC102, target device 103, and gNB104;

the data network 101 is configured to determine an SFN area and each MBS session transmitted in the SFN area according to a deployment scenario of the MBS session, generate relevant information of the SFN area, and send the relevant information of the SFN area to the 5GC102;

wherein, the relevant information of the SFN area comprises:

(1) Identification ID of SFN area;

the 5GC102 is configured to receive information about the SFN area sent by the data network 101;

the 5GC102 is further configured to generate target information of the SFN area according to a cell list in the relevant information of the SFN area, and send the target information of the SFN area to the target device 103;

The target device 103 is configured to receive target information of the SFN area sent by the 5GC102, configure at least one MCH for the SFN area, determine MBS sessions carried on each MCH, configure one PMCH for each MCH, and determine configuration information of each PMCH;

the data network 101 is further configured to transmit data of each MBS session of the SFN area to the 5GC102;

the 5GC102 is further configured to receive data of each MBS session in the SFN area sent by the data network 101, determine target session information according to the data of each MBS session in the SFN area, and send the target session information to the target device 103, where the target session information is used for the target device 103 to schedule the data of each MBS session;

the target device 103 is further configured to receive the target session information sent by the 5GC102, and for each PMCH, the target device 103 obtains, from the target session information, data amount information of each MBS session carried on a MCH corresponding to the PMCH, schedules the PMCH in each scheduling period of the PMCH, and determines MBS scheduling information MAC CE of the PMCH in each scheduling period;

the gNB104 corresponding to each cell in the cell list of the target information of the SFN area is also used for determining a target cell belonging to the SFN area in the self-controlled cells according to the cell list;

The gNB104 is further configured to broadcast, in each target cell, configuration information of an MCCH of the SFN area through an SIB dedicated to the SFN, and send the MCCH of the SFN area, where the MCCH of the SFN area carries the configuration information of each PMCH of the SFN area;

in each target cell, for each PMCH, the gNB104 is further configured to use a corresponding protocol stack to perform layer-by-layer processing on data of each MBS session carried on the MCH corresponding to the PMCH; in each scheduling period of the PMCH, the gNB104 determines S TBs sent through the PMCH in the scheduling period and an MCS adopted by each TB according to the MBS scheduling information MAC CE of the PMCH in the scheduling period, where the gNB104 sends the S TBs in the scheduling period of the PMCH by using s×r×n PMCH slots before occupation in the scheduling period, determines the TBs sent through the PMCH in each occupied PMCH slot according to the subscript of the mapping manner of the slots and the beams in the scheduling period in the configuration information of the PMCH, and sends the PMCH, the DMRS of the PMCH, and the PTRS of the PMCH in each occupied PMCH slot.

Claims

1. A transmission method of MBS session in SFN mode in NR system is characterized in that the method comprises:

(1) Identification ID of SFN area;

5GC receives the relevant information of the SFN area sent by the data network;

the data network transmits the data of each MBS session of the SFN area to 5GC;

2. The method of claim 1 wherein the target device receives target information of the SFN area sent by the 5GC, configures at least one MCH for the SFN area, determines MBS sessions carried on each MCH, configures one PMCH for each MCH, and determines configuration information for each PMCH, comprising:

(1) A second MBS session list;

3. The method according to claim 1 or 2, wherein the target device determining time domain resource configuration information in PMCH resource pool configuration information comprises:

4. The method according to claim 1 or 2, wherein the target device determines DMRS configuration information of PMCH and PTRS configuration information of PMCH in PMCH resource pool configuration information, comprising:

5. The method according to claim 1 or 2, wherein the target device determines the frequency resource configuration information in the PMCH resource pool configuration information, comprising:

6. The method according to claim 1 or 2, wherein for one PMCH, the mapping manner of the time slot and the beam in the scheduling period includes:

7. The method of claim 1, wherein in each target cell, for each PMCH, the gNB uses a corresponding protocol stack to process, layer by layer, data of each MBS session carried on a MCH corresponding to the PMCH, including:

8. The method of claim 1, wherein when the target device is a unique one of the gnbs corresponding to the cells in the cell list in the relevant information of the SFN area, the 5GC generates the target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

9. The method of claim 1, wherein when the target device is each gNB corresponding to a cell in the cell list in the relevant information of the SFN area, the 5GC generates target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

10. The method of claim 1, wherein when the target device is each gNB corresponding to a cell in the cell list in the relevant information of the SFN area, the 5GC generates target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

11. The method according to claim 1, wherein when the target device is 1 or more multi-cell coordination entities MCEs corresponding to cells in a cell list in the relevant information of the SFN area, the 5GC generates target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

12. The method according to claim 1, wherein when the target device is 1 or more multi-cell coordination entities MCEs corresponding to cells in a cell list in the relevant information of the SFN area, the 5GC generates target information of the SFN area according to the cell list in the relevant information of the SFN area, and sends the target information of the SFN area to the target device, including:

13. A transmission system of MBS control information in SFN mode in an NR system, comprising:

wherein, the relevant information of the SFN area comprises:

(1) Identification ID of SFN area;