CN113453164B

CN113453164B - Method, device and equipment for broadcasting MBMS in NR cell

Info

Publication number: CN113453164B
Application number: CN202010231504.XA
Authority: CN
Inventors: 魏立梅; 袁乃华; 范晨; 陈迎; 周志宏; 朱玉梅
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2022-09-13
Anticipated expiration: 2040-03-27
Also published as: CN113453164A

Abstract

The application provides a method, a device and equipment for broadcasting MBMS in an NR cell, wherein the method comprises the following steps: receiving a PDU session of an MBMS; processing layer by layer through a user plane protocol stack, wherein the RLC layer sends the generated RLC PDU to the MAC layer through SC-MTCH; the MAC layer distributes PDSCH and PDCCH resources for the MAC SDU, generates MAC PDU according to the PDSCH resources and sends the MAC PDU to the physical layer through DL-SCH; generating PDSCH scheduling information according to PDSCH resources, and sending the PDSCH and PDCCH resource allocation information and the PDSCH scheduling information to a physical layer; and the physical layer takes the MAC PDU as a TB and carries the MAC PDU through the PDSCH, processes the PDSCH and broadcasts the PDSCH through PDSCH resources. The broadcast of the MBMS in the NR cell is achieved.

Description

Method, device and equipment for broadcasting MBMS in NR cell

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a device for broadcasting an MBMS in an NR cell.

Background

Multimedia Broadcast Multicast Service (MBMS) is a typical Service supported by a Long Term Evolution (LTE) system in a third Generation Partnership Project (3 GPP) protocol, and The Service may be transmitted to a specific User Equipment (UE) through a unicast bearer or Broadcast in a cell through an MBMS bearer.

With the continuous development of wireless communication technology, 5G systems have entered into the lives of people. However, currently, the 5G system does not support MBMS broadcast in a Single Cell Point to Multipoint (SC-PTM) manner in a New Radio Access (NR) Cell, where the NR Cell is a Cell controlled by a base station of the 5G system.

Disclosure of Invention

The application provides a method, a device and equipment for broadcasting an MBMS in an NR cell, which can realize the broadcasting of the MBMS in the NR cell.

In a first aspect, the present application provides a method for broadcasting MBMS in an NR cell, comprising: receiving data of a Multimedia Broadcast Multicast Service (MBMS) which arrives in a protocol data unit Session (PDU Session) form, wherein the MBMS passes through a unique identifier of a group-radio network temporary identifier (G-RNTI); PDU Session of MBMS is processed layer by layer through a user plane protocol stack until a radio link control RLC layer of the user plane protocol stack is reached; the RLC entity of the RLC layer processes the RLC service data unit SDU on the RLC channel to generate RLC PDU, and the RLC PDU is sent to a media access control MAC layer of a user plane protocol stack through a corresponding logical channel SC-MTCH; the MAC entity of the MAC layer distributes physical downlink shared channel PDSCH resources and physical downlink control channel PDCCH resources for MAC SDUs loaded on the SC-MTCH, the MAC entity generates MAC PDUs according to the distributed PDSCH resources by the MAC SDUs, the MAC PDUs are sent to the physical layer through corresponding downlink transmission channels DL-SCH, the MAC entity also generates PDSCH scheduling information according to the distributed PDSCH resources, and the PDSCH scheduling information, PDSCH resource distribution information and PDCCH resource distribution information are sent to the physical layer; the physical layer takes the MAC PDU as a transmission block TB and carries the MAC PDU through the PDSCH, processes the PDSCH, broadcasts the PDSCH in an NR cell through the allocated PDSCH resources, and also broadcasts the PDCCH through the allocated PDCCH resources, and the PDCCH carries scheduling information of the PDSCH.

Optionally, the PDU Session is processed layer by layer through the user plane protocol stack until reaching the RLC layer of the radio link control of the user plane protocol stack, including: establishing an SDAP entity, a PDCP entity and an RLC entity; the PDU Session is mapped to the corresponding radio bearer RB through the processing of the SDAP entity; the PDCP SDUs on the RB are mapped onto the corresponding RLC channel through the processing of the PDCP entity.

Optionally, the PDU Session is processed layer by layer through the user plane protocol stack until reaching the RLC layer of the radio link control of the user plane protocol stack, including: establishing an SDAP entity and an RLC entity; the PDU Session is mapped to a corresponding RLC channel through the processing of the SDAP entity.

Optionally, the physical layer carries the MAC PDU as a transport block TB through the PDSCH, and processes the PDSCH, including: the method comprises the steps of processing TB on the PDSCH, processing a demodulation reference signal DMRS on the PDSCH and processing a phase tracking reference signal PT-RS on the PDSCH.

Optionally, the processing of the TB on the PDSCH by the physical layer includes: the physical layer performs channel coding, bit scrambling, modulation, layer mapping, antenna port mapping, virtual resource block VRB mapping, mapping from VRB to physical resource block PRB, and generation of baseband signals on the TB on the PDSCH.

Optionally, the physical layer performs bit scrambling on the TBs on the PDSCH, including: in bit scrambling, the scrambling sequence generator is initialized with the following expression:

c _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID

wherein q is a subscript of a TB carried on the PDSCH, and for the PDSCH carrying the MBMS, the PDSCH can only carry one codeword, and the subscript of the codeword is q ═ 0, n _RNTI A receiving side for identifying PDSCH, n is when the PDSCH bears MBMS _RNTI G-RNTI for indicating MBMS carried on current PDSCH, n _ID E {0, 1.., 1023} is the PDSCH scrambling ID.

Optionally, the physical layer performs modulation, layer mapping, and antenna port mapping on the TBs on the PDSCH, including: a fixed MCS subscript table is adopted when the modulation order, the target code rate and the spectral efficiency of the PDSCH bearing the MBMS are determined according to the MCS subscript; the MCS index table is a table specifically set for the MBMS through simulation, or any one of MCS index tables existing in the 3GPP protocol.

The PDSCH is transmitted in a single layer.

The PDSCH is transmitted using a single antenna port.

Optionally, the VRB mapping for the TB on the PDSCH by the physical layer includes: in VRB mapping, whether the PDSCH avoids demodulation reference signals DMRS of other UEs is determined as follows: and whether the PDSCH carrying the MBMS avoids the DMRS of other UEs is specified in a 3GPP protocol, or whether the PDSCH carrying the MBMS avoids the DMRS of other UEs in VRB mapping is determined according to a first preset parameter, wherein the first preset parameter is used for indicating whether the PDSCH carrying the MBMS avoids the DMRS of other UEs in VRB mapping.

Optionally, the mapping from VRBs to PRBs is performed on the TB on the PDSCH by the physical layer, which includes: determining whether the mapping from the VRB to the PRB adopts interleaving mapping or not according to a second preset parameter, wherein the second preset parameter is used for indicating whether the mapping from the VRB to the PRB adopts interleaving mapping or not; if interleaving mapping is adopted in the mapping from the VRB to the PRB, the size of the PRB bundle is a fixed value or a configurable value; if interleaving mapping is adopted in the mapping from VRB to PRB, the total number of PRB bundles and the number of Resource Blocks (RB) included in any PRB bundle are determined according to a search space where the PDCCH is located and a control resource set (CORESET), and the PDCCH carries the PDSCH scheduling information.

Optionally, if interleaving mapping is adopted in mapping from VRBs to PRBs, determining the total number of PRB bundles and the number of resource blocks RB included in any PRB bundle according to a search space where a PDCCH is located and a control resource set CORESET, including: when PDCCH is mapped onto CORESET0, the total number N of PRB bundles is determined according to the following expression _bundle ：

Wherein the content of the first and second substances,

represents the number of RBs included in CORESET0, L ═ 2; accordingly, if

mod L > 0, then the subscript is N _bundle The PRB bundle of-1 comprises the number of RBs:

mod L; otherwise subscript is N _bundle -1 PRB bundle comprising a number L of RBs; the PRB bundle of other subscripts includes the number of RBs L.

When PDCCH is mapped to a common search space on an initial bandwidth slice BWP and the common search space is irrelevant to CORESET0, the total number N of PRB bundles is determined according to the following expression _bundle ：

Wherein the content of the first and second substances,

indicating the number of RBs included in the initial BWP, when the cell is configured with CORESET0,

equal to the number of RBs included in CORESET0, when the cell is not configured with CORESET0,

for the number of RBs included for the initial BWP,

indicating the start of the initial BWP as a position,

common representation of PDCCH mapping in initial BWPA starting position of the common search space, L ═ 2; accordingly, a PRB bundle with subscript 0 includes the number of RBs as:

if it is

Subscript is N _bundle The PRB bundle of-1 includes the number of RBs:

otherwise, the subscript is N _bundle The PRB bundle of-1 includes the number of RBs: l; the number of RBs included in other subscripted PRB bundles is L;

determining a total number N of PRB bundles when PDCCH is mapped to one common search space on non-initial BWP according to the following expression _bundle ：

Wherein the content of the first and second substances,

indicates the number of RBs, L, included in the BWP having index i _i Indicating the number of RBs included in the PRB bundle;

indicating the starting position of the corresponding BWP; correspondingly, a PRB bundle with subscript 0 includes the following number of RBs:

when in use

When the subscript is N _bundle The PRB bundle of-1 includes the number of RBs:

modL _i (ii) a Otherwise, the subscript is N _bundle The PRB bundle of-1 comprises the number of RBs: l is _i Other subscripted PRB bundle includes L number of RBs _i 。

Optionally, the processing of the DMRS for the PDSCH by the physical layer includes: generating a DMRS sequence; and mapping the DMRS sequence to the physical resource indicated by the PDSCH resource configuration information.

Wherein generating a DMRS sequence comprises: initializing a pseudo-random sequence generator according to the following expression:

where l denotes the index of the symbol within the slot, n _SCID The subscript indicating the scrambling ID is given by,

indicates the number of symbols included in 1 slot,

the index of 1 slot within a radio frame when the subcarrier spacing SCS parameter is u,

is the scrambling ID with subscript 0.

Wherein the content of the first and second substances,

the configuration may be done in one of the following ways:

is the physical layer cell ID of the cell broadcasting the MBMS.

MBMS configuration broadcast in a cell in units of the cell

Each NR cell is configured independently.

The core network or the newly added entity between the core network and the 5G base station gNB is uniformly configured for the MBMS

All NR cells broadcasting the same MBMS uniformly adopt the same

The core network or the entity newly added between the core network and the gNB takes the area as a unit and configures the MBMS broadcast in the area

Using the same for each NR cell within a region

gNB central unit CU is configured uniformly for one MBMS

Each NR cell controlled by each gNB distribution unit DU connected with the gNB CU is identical

Only one antenna port is adopted when the DMRS sequence is mapped to the physical resource; when the DMRS is mapped to physical resources, determining the configuration type of the DMRS according to the following modes: the configuration type of the DMRS is determined according to the specification in the 3GPP protocol or through a third parameter, and the third parameter is used for indicating the configuration type of the DMRS.

Optionally, the processing of the PT-RS of the PDSCH by the physical layer includes: generating a PT-RS sequence; and mapping the PT-RS sequence to physical resources indicated by the PDSCH resource configuration information according to the time density LPT-RS and the frequency density KPT-RS.

When the time density related parameters and the frequency density related parameters are configured at the same time, the time density LPT-RS of the PT-RS and the frequency density KPT-RS of the PT-RS are respectively functions of a modulation coding method MCS adopted by the PDSCH, and a time density Table of the PT-RS of 3GPP TS38.214tablet 5.1.6.3-1 and a frequency density Table of the PT-RS of 3GPP TS38.214Table 5.1.6.3-2 are respectively checked according to the modulation coding method MCS scheduled to determine corresponding parameter values.

When only the time density-related parameter is configured, the time density table of the PT-RS is looked up to determine the LPT-RS, and the mapping of the frequency domain is performed according to KPT-RS 2.

When only the frequency density related parameters are configured, the frequency density table of the PT-RS is checked to determine the KPT-RS, and time domain mapping is performed according to LPT-RS being 1.

When the time density related parameter and the frequency density related parameter are not configured, mapping is performed according to time density LPT-RS which is 1 and frequency density KPT-RS which is 2; however, when the scheduled MCS is less than 10 or the scheduled RB total number is less than 3, no PT-RS process is as follows.

Optionally, the physical layer broadcasts the PDSCH in the NR cell through the allocated PDSCH resources, including: in K time machines distributed for PDSCH transmission each time, a physical layer respectively adopts K wave beams to transmit PDSCH, the PDSCH adopts distributed time-frequency resources to transmit in each time machine, K is the wave beam number adopted by SS/PBCH blocks in NR cells broadcasting MBMS, and K wave beams are K wave beams adopted by SS/PBCH blocks in NR cells broadcasting MBMS.

Optionally, the allocating, by the MAC entity in the MAC layer, PDSCH resources of the physical downlink shared channel to the MAC SDU carried on the SC-MTCH includes: the MAC entity of the MAC layer determines the sending times of the PDSCH, allocates K occasions for each PDSCH sending, and allocates time-frequency resources for the PDSCH in each occasion; the PDSCH is used to carry MAC PDUs, and may be repeatedly transmitted multiple times.

In the following, apparatuses, devices and storage media based on the method for broadcasting MBMS in NR cell will be provided, and the effect thereof can refer to the corresponding effect of the above method for broadcasting MBMS in NR cell, which will not be described in detail below.

In a second aspect, the present application provides an apparatus for broadcasting MBMS in an NR cell, comprising:

and the receiving module is used for receiving data of a multimedia broadcast multicast MBMS which arrives in a protocol data unit conversation PDU conversation mode, wherein the MBMS is uniquely identified by a group-radio network temporary identifier G-RNTI.

The processing module is used for processing the PDU conversation of the MBMS layer by layer through a user plane protocol stack until the PDU conversation reaches a Radio Link Control (RLC) layer of the user plane protocol stack; the RLC entity of the RLC layer processes RLC service data units SDU on the RLC channel to generate RLC PDUs, and the RLC PDUs are sent to a Media Access Control (MAC) layer of a user plane protocol stack through a corresponding logical channel SC-MTCH; the MAC entity of the MAC layer distributes physical downlink shared channel PDSCH resources and physical downlink control channel PDCCH resources for MAC SDUs loaded on the SC-MTCH, the MAC entity of the physical layer also generates MAC PDUs according to the distributed PDSCH resources by the MAC SDUs, the MAC PDUs are sent to the physical layer through corresponding downlink transmission channels DL-SCH, the MAC entity also generates PDSCH scheduling information according to the distributed PDSCH resources, and the PDSCH scheduling information, PDSCH resource distribution information and PDCCH resource distribution information are sent to the physical layer; the physical layer takes the MAC PDU as a transmission block TB and carries the MAC PDU through the PDSCH to process the PDSCH, the PDSCH is broadcasted in the NR cell through the allocated PDSCH resources, the physical layer also broadcasts the PDCCH through the allocated PDCCH resources, and the PDCCH carries scheduling information of the PDSCH.

In a third aspect, the present application provides an apparatus for broadcasting MBMS in an NR cell, comprising: at least one processor and memory; the memory stores computer execution instructions; the at least one processor executes the computer-executable instructions stored by the memory to cause the at least one processor to perform a method of broadcasting MBMS in NR cells as the first aspect includes any.

In a fourth aspect, the present application provides a computer readable storage medium having stored thereon computer executable instructions which, when executed by a processor, implement a method of broadcasting MBMS in NR cells as any one of the aspects includes.

The application provides a method, a device and equipment for broadcasting MBMS in an NR cell, which receives data of a multimedia broadcast multicast MBMS which arrives in a protocol data unit session PDU session form, wherein the MBMS is uniquely identified by a group-radio network temporary identifier G-RNTI; then, the PDU Session of the MBMS is processed layer by layer through a user plane protocol stack; the RLC entity of the RLC layer processes RLC SDU on the RLC channel to generate RLC PDU, and the RLC PDU is sent to a media access control MAC layer of a user plane protocol stack through a corresponding logic channel SC-MTCH; the MAC entity of the MAC layer distributes Physical Downlink Shared Channel (PDSCH) resources and Physical Downlink Control Channel (PDCCH) resources for MAC SDUs (physical downlink shared channel) borne on the SC-MTCH, PDSCH resource distribution information and PDCCH resource distribution information are sent to the physical layer, the MAC entity also generates MAC PDU (media access control protocol data unit) from the MAC SDU according to the distributed PDSCH resources, the MAC PDU is sent to the physical layer through a corresponding downlink transmission channel (DL-SCH), and the MAC entity also generates PDSCH scheduling information according to the distributed PDSCH resources and sends the PDSCH scheduling information to the physical layer; the physical layer takes the MAC PDU as a transmission block TB and carries the MAC PDU through a PDSCH to process the PDSCH, the PDSCH is broadcasted in an NR cell through allocated PDSCH resources, the physical layer also broadcasts the PDCCH through allocated PDCCH resources, the PDCCH carries scheduling information of the PDSCH, each MBMS corresponds to a logic channel SC-MTCH in one cell, the SC-MTCH carries data of the MBMS, the SC-MTCH is mapped to an independent DL-SCH, and the DL-SCH is mapped to the PDSCH; the gNB can allocate air interface resources for the PDSCH bearing the MBMS, so that the PDSCH bearing the MBMS is broadcasted in the cell through the allocated air interface resources, and the broadcasting of the MBMS in the NR cell is further realized.

Drawings

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

Fig. 1 is an architecture diagram of a next generation radio access network in a 5G system provided in the present application;

fig. 2 is a flowchart illustrating a method for broadcasting MBMS in an NR cell according to the present application;

fig. 3 is a schematic structural diagram of a user plane protocol stack provided in the present application;

fig. 4 is a schematic structural diagram of another user plane protocol stack provided in the present application;

fig. 5 is a schematic flowchart of a method for processing TBs on a PDSCH by a physical layer according to the present application;

fig. 6 is a flowchart illustrating a method for processing a demodulation reference signal DMRS of a PDSCH by a physical layer according to the present application;

fig. 7 is a flowchart illustrating a method for processing PT-RS of PDSCH by a physical layer according to the present application;

fig. 8 is a schematic structural diagram of an apparatus for broadcasting MBMS in an NR cell according to the present application;

fig. 9 is a schematic structural diagram of an apparatus for broadcasting MBMS in an NR cell according to the present application.

Detailed Description

The technical solutions in the present application will be described clearly and completely with reference to the drawings in the present application, and it is obvious that the described applications are only a part of the applications of the present invention, not all of them. All other applications which can be obtained by a person skilled in the art without making creative efforts based on the applications in the present invention belong to the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the applications of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

MBMS is a typical service supported by the LTE system in 3GPP protocol, and the service may be transmitted to a specific UE through a unicast bearer, or may be broadcast in a cell through an MBMS bearer. There are the following two ways of broadcasting MBMS over MBMS bearers. One is to Broadcast the MBMS in a multimedia Broadcast Multicast Single Frequency Network (MBSFN) manner; the other is to broadcast MBMS in a cell by SC-PTM mode.

With the continuous development of wireless network technology, 5G systems have come into operation. FIG. 1 is an architecture diagram of a NG-RNA of a Next Generation Radio Access Network (NG-RAN for short) in a 5G system according to the present invention. As shown in fig. 1, the gNB is a base station of a 5G system, the cell controlled by the gNB is an NR cell, the ng-eNB is an LTE-advanced base station accessing a 5G core network, and the cell controlled by the ng-eNB is an LTE cell. The gNB and the NG-eNB are respectively connected with the 5GC through NG interfaces, the gNB is interconnected through an Xn interface, the gNB is connected with the NG-eNB through an Xn interface, and the NG-eNB is interconnected through an Xn interface. However, the current 5G system does not support broadcasting MBMS in an SC-PTM manner in NR cells. In order to solve the problem of broadcasting the MBMS in the NR cell in an SC-PTM mode, the method for broadcasting the MBMS in the NR cell is provided, and the MBMS can be broadcast in the NR cell in the SC-PTM mode.

In the process of MBMS broadcast, the MBMS server sends MBMS data to the gnbs corresponding to the NR cells broadcasting MBMS via the relevant network elements or entities. In particular, the relevant network element or entity may be a core network. In the 5G system, data of one common service is transmitted to the gNB in the form of a protocol data unit Session (PDU Session). In this application, the PDU Session is used to indicate the MBMS data transmitted by the server to the gNB via the relevant network element or entity. And the PDU Session corresponding to the MBMS adopts a user plane protocol stack when the air interface is processed.

The technical solution of the present invention will be described in detail below with reference to examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 2 is a flowchart illustrating a method for broadcasting an MBMS in an NR cell according to the present application, where an implementation subject of the method may be all or part of an apparatus for broadcasting an MBMS, and the apparatus for broadcasting an MBMS may be a 5G base station gNB. In the flowchart, the MBMS data that needs to be broadcast in an NR cell is sent to the base station gNB corresponding to the NR cell by another network element or entity in the form of a protocol data unit Session PDU Session. The base station executes the processing given by the flow chart in the cell to realize the MBMS broadcast in the NR cell. As shown in fig. 2, a method for broadcasting an MBMS in an NR cell provided by the present application includes:

step S201, receiving data of an MBMS which arrives in a protocol data unit conversation PDU Session form, wherein the MBMS passes through a unique identifier of a group-radio network temporary identifier G-RNTI.

One possible implementation of an MBMS unique identifier via the group-radio network temporary identifier G-RNTI is: and the gNB configures G-RNTI for the MBMS to be broadcasted. The gNB can configure one G-RNTI for each cell broadcasting the MBMS in the controlled cells in a unified manner, and can also configure one G-RNTI for each cell in a distributed manner.

Another possible implementation manner of the MBMS unique identifier by the group-radio network temporary identifier G-RNTI is: the network element or the entity configures G-RNTI for MBMS to be broadcasted, and each cell controlled by each gNB connected with the network element or the entity adopts the G-RNTI to identify the MBMS. For example, the core network configures the G-RNTI for the MBMS to be broadcasted. For another example, an entity is added between the core network and the gNB for configuring a G-RNTI for the MBMS to be broadcasted from the core network.

Yet another possible implementation manner of the MBMS via the group-radio network temporary identifier G-RNTI unique identifier is: the gNB Central Unit (CU) configures the G-RNTI for the MBMS to be broadcast. Each cell controlled by each gNB Distribution Unit (DU) connected to a gNB CU identifies the MBMS by the G-RNTI.

Step S202, PDU Session of the MBMS is processed layer by layer through the user plane protocol stack until the radio link control RLC layer of the user plane protocol stack is reached.

Fig. 3 is a schematic structural diagram of a user plane Protocol stack provided in the present application, and as shown in fig. 3, the user plane Protocol stack includes a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a physical layer.

Correspondingly, the PDU Session is processed layer by layer through the user plane protocol stack until it reaches the radio link control RLC layer of the user plane protocol stack, and a possible implementation manner is:

the MBMS data from other network elements or entities arrive at the base station corresponding to each cell broadcasting the MBMS in the form of PDU Session. For any cell broadcasting the MBMS, a base station controlling the cell adopts the following processing in the cell:

and establishing a corresponding SDAP entity, a PDCP entity, an RLC entity and an MAC entity for the PDU Session for bearing the MBMS. And allocates a logical channel SC-MTCH to the MBMS, the logical channel being mapped to a separate DL-SCH, which is mapped to a separate PDSCH. The PDU Session arrives at the SDAP entity in the form of a Service Data Unit (SDU), and the SDAP SDU is mapped onto a corresponding Radio Bearer (RB) through processing by the SDAP entity. The PDCP SDU on the RB is mapped onto a corresponding RLC channel through the processing of the PDCP entity.

Fig. 4 is a schematic structural diagram of another user plane protocol stack provided in the present application, and as shown in fig. 4, the user plane protocol stack includes an SDAP layer, an RLC layer, an MAC layer, and a physical layer.

Correspondingly, another possible implementation manner of the PDU Session is processed layer by layer through the user plane protocol stack until the PDU Session reaches the radio link control RLC layer of the user plane protocol stack is:

the data of the MBMS reaches the base station corresponding to each cell broadcasting the MBMS in a PDU Session mode. For any cell broadcasting the MBMS, a base station controlling the cell adopts the following processing in the cell:

the base station establishes a corresponding SDAP entity, an RLC entity and an MAC entity for PDU Session for bearing MBMS. And allocates a logical channel SC-MTCH for the MBMS, the logical channel being mapped on a separate DL-SCH, the DL-SCH being mapped on a separate PDSCH. The PDU Session arrives at the SDAP entity in the form of SDAP SDU, which is mapped onto the corresponding RLC channel by the SDAP entity.

Step S203, the RLC entity of the RLC layer processes the RLC SDU on the RLC channel to generate RLC PDU which is sent to the MAC layer of the user plane protocol stack through the corresponding logical channel SC-MTCH.

Specifically, the RLC channel may be an RLC channel of the UM mode.

Step S204, the MAC entity of the MAC layer distributes physical downlink shared channel PDSCH resources and physical downlink control channel PDCCH resources for MAC SDUs loaded on the SC-MTCH, the MAC entity generates MAC PDUs according to the distributed PDSCH resources by the MAC SDUs, the MAC PDUs are sent to the physical layer through corresponding downlink transmission channels DL-SCH, the MAC entity generates PDSCH scheduling information according to the distributed PDSCH resources, and the PDSCH scheduling information, the PDSCH resource distribution information and the PDCCH resource distribution information are sent to the physical layer.

Wherein, the PDSCH resource is used to send a MAC protocol data unit (PDU for short); the PDCCH resource is used to transmit scheduling information of the PDSCH.

A possible implementation manner for the MAC entity of the MAC layer to allocate PDSCH resources of the physical downlink shared channel to the MAC SDU carried on the SC-MTCH is as follows: on a Bandwidth Part (BWP for short) for transmitting MBMS, the MAC entity determines the number of times V of repeated transmission of PDSCH, allocates K × V PDSCH occasions for PDSCH, and then allocates time-frequency resources to PDSCH in each PDSCH occasion. Where K is the number of beams used when a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH) is transmitted in the current NR cell. Specifically, the MAC entity allocates K PDSCH occasions for each PDSCH transmission, and when the PDSCH is repeatedly transmitted V times, the MAC entity allocates K × V PDSCH occasions in total. And uniformly numbering the K V PDSCH occasions according to the time sequence, wherein the number is from 0 to K V-1.

The method for distributing the physical downlink control channel PDCCH resource for the MAC SDU carried on the SC-MTCH by the MAC entity of the MAC layer is not the content of the invention and is not repeated.

Specifically, the BWP for transmitting the MBMS is determined in one of the following ways:

in the first mode, the gNB determines the BWP for transmitting the MBMS in the current NR cell.

And in the second mode, the network element or the entity determines the BWP for transmitting the MBMS, and each cell controlled by each gNB connected with the network element or the entity transmits the MBMS by adopting the BWP. For example, the core network determines the BWP to transmit the MBMS. As another example, an entity is added between the core network and the gNB to determine BWP for MBMS transmission.

And in the third mode, the gNB CU determines the BWP for transmitting the MBMS, and each cell controlled by each gNB DU connected with the gNB CU transmits the MBMS by adopting the BWP.

Step S205, the physical layer takes the MAC PDU as a transmission block TB and carries the MAC PDU through the PDSCH, processes the PDSCH, broadcasts the PDSCH in the NR cell through the distributed PDSCH resources, and broadcasts the PDCCH through the distributed PDCCH resources, and the PDCCH carries the scheduling information of the PDSCH.

The physical layer carries the MAC PDU as a transport block TB through the PDSCH, and one possible implementation manner of processing the PDSCH is as follows: processing TB on the PDSCH, processing a demodulation reference signal DMRS of the PDSCH and processing a phase tracking reference signal PT-RS of the PDSCH.

One possible implementation way for the physical layer to broadcast the PDSCH in the NR cell through the allocated PDSCH resources is: the physical layer repeatedly transmits the PDSCH V times, starting from the first PDSCH opportunity, each time of transmission occupies K continuous PDSCH opportunities, and K wave beams are respectively adopted in the K continuous PDSCH opportunities to transmit the corresponding PDSCH. The K wave beams are K wave beams adopted by the SS/PBCH block in the current cell. The K beams are used in the same order every time the PDSCH is repeatedly transmitted. Namely: in the V (V ═ 1, …, V) th PDSCH transmission, the PDSCH is transmitted using the K-th beam in the { (V-1) × K + K } th PDSCH occasion. Preferably, the beam order used at each PDSCH transmission is the same as the beam order used at the SS/PBCH transmission, i.e.: the kth beam used in the { (v-1) × K + K } th PDSCH occasion is the beam used by the SS/PBCH block with index K, K is 0, …, K-1.

The method for the physical layer to broadcast the PDCCH through the allocated PDCCH resources is not the content of the invention and is not described again. In the method shown in fig. 2, a possible implementation manner for the MAC entity of the MAC layer to allocate PDSCH resources of the physical downlink shared channel to MAC SDUs carried on the SC-MTCH is as follows: and the MAC entity determines the repeated transmission times V of the PDSCH, allocates K V PDSCH occasions for the PDSCH, and then allocates time-frequency resources to the PDSCH in each PDSCH occasion. Specifically, the MAC entity allocates K PDSCH occasions for each PDSCH transmission, and when the PDSCH is repeatedly transmitted V times, the MAC entity allocates K × V PDSCH occasions in total. This will be explained in detail below.

Generally, the MAC entity allocates K PDSCH occasions for each PDSCH transmission, and one possible implementation manner of allocating time-frequency resources to the PDSCH in each PDSCH occasion is as follows:

and determining a table on which the PDSCH time domain resource allocation in each PDSCH time machine is to be based, and then allocating the time domain resource to the PDSCH in each PDSCH time machine based on the determined table. After the time domain resources are successfully allocated to the PDSCH in one opportunity, the frequency domain resources are allocated to the PDSCH in the opportunity. In the following, the intra-time frequency resource allocation process of each PDSCH is described in detail.

When the gNB configures a PDSCH time domain resource allocation list for the current MBMS, PDSCH time domain resource allocation needs to be based on each item in the list in each PDSCH occasion, that is: in K PDSCH occasions allocated to each PDSCH transmission, the PDSCH time domain resource allocation parameters in each PDSCH occasion must completely conform to the time domain resource allocation parameters indicated by a certain item in the list. Preferably, each opportunity has the same K0. K0 is the timing difference between the PDSCH carrying the MAC PDU and the PDCCH carrying the PDSCH scheduling information. K0 is a parameter included for each entry in the PDSCH time domain resource allocation list.

When the gNB does not configure a PDSCH time domain resource allocation list for the current MBMS, determining a default table on which PDSCH time domain resource allocation needs to be based in each PDSCH time machine according to the following table 1 or table 2, and then allocating time domain resources to PDSCHs in each PDSCH time machine based on the default table, namely: in K PDSCH occasions allocated to each PDSCH transmission, the parameter of PDSCH time domain resource allocation in each PDSCH occasion must completely conform to the time domain resource allocation parameter indicated by a certain entry in the default table. For example, according to table 1, when the PDSCH time domain resource allocation list is not configured for the MBMS, the time domain resource is allocated to the PDSCH carrying the MBMS according to the default table a. Specifically, in K PDSCH occasions allocated to each PDSCH transmission, the PDSCH time domain resource allocation parameters in each PDSCH occasion must completely conform to the time domain resource allocation parameters indicated by a certain item in the default table a.

The default table, table 1, table 2, and PDSCH time domain resource allocation list are explained in detail below.

The default table is four PDSCH time domain resource allocation tables configured for NR cells by the 3GPP protocol: PDSCH time domain resource allocation table a under Normal CP (NCP), PDSCH time domain resource allocation table A, PDSCH under Extended CP (ECP), and PDSCH time domain resource allocation table C using NCP. These tables are defined in 3GPP TS38.214, chapter 5, section 5.1.2.1.

For the PDSCH carrying the MBMS, the search space type corresponding to the PDCCH carrying the PDSCH scheduling information is: in common, the space may be mapped on CORESET0 or other CORESET. Thus, the present application proposes: table 1 shows a PDSCH time domain resource allocation table suitable for PDSCH carrying MBMS.

Table 1: time domain resource allocation table suitable for PDSCH bearing MBMS

In table 1, the fourth column is used to indicate whether a PDSCH time domain resource allocation list is allocated to a PDSCH carrying an MBMS. In this column, "none" and "there" indicate that MBMS is "configured" and "unconfigured" PDSCH time domain resource allocation lists, respectively. When configuring a 'PDSCH time domain resource allocation list' for the MBMS (see the third row and the fifth row), the configured list is directly adopted to allocate the time domain resources to the PDSCH in each PDSCH time machine. When the MBMS is not configured with the "PDSCH time domain resource allocation list" (see the second row and the fourth row), the time domain resources are allocated to the PDSCH within each PDSCH time domain using the default table a (see the fifth column) regardless of the value of the multiplexing mode of the SS/PBCH block and the CORESET within the cell (see the third column) regardless of whether the PDCCH is mapped to CORESET0 or other CORESET (see the second column). Specifically, the table a under NCP or the table a under ECP is adopted, and the determination is performed according to the CP type corresponding to the PDSCH. When the PDSCH adopts NCP, the table A below the NCP is adopted; when ECP is used for PDSCH, table a below ECP is used.

In order to increase flexibility, when the "PDSCH time domain resource allocation list" is not configured for the MBMS, different default tables may be used according to the multiplexing mode of the SS/PBCH block and the CORESET when the PDSCH is allocated with time domain resources in each PDSCH time machine. Specifically, as shown in table 2.

Table 2: time domain resource allocation table suitable for PDSCH bearing MBMS

In Table 2, the meaning of the fourth column is the same as that of Table 1, and will not be described again. In table 2, when the PDCCH search space is mapped to the common search space on CORESET0 (see second column, second row), when the multiplexing modes of SS/PBCH block and CORESET are 1, 2, and 3, respectively, the time domain resources are allocated to PDSCH in each time machine based on the default tables A, B and C, respectively. When the PDCCH search space is mapped to a common search space on CORESET other than CORESET0 (see third row in the second column), when the multiplexing modes of SS/PBCH block and CORESET are 1, 2, and 3, respectively, time domain resources are allocated to PDSCH in the respective PDSCH occasions based on the default tables A, B and C, respectively. Specifically, the table a under NCP or the table a under ECP is determined according to the CP type corresponding to the PDSCH. When the PDSCH adopts NCP, the table A below the NCP is adopted; when the PDSCH employs ECP, table a below ECP is employed.

When the gNB configures a "PDSCH time domain resource allocation list" for the MBMS, the list may be preferentially adopted for PDSCH time domain resource allocation. Next, the present application provides a method for configuring a PDSCH time domain resource allocation list of an MBMS.

Optionally, the "PDSCH time domain resource allocation list" configured by the gNB may be a list at a cell level or a BWP level. The cell-level list is applicable to PDSCH corresponding to all MBMS in one NR cell. The BWP level list is applicable to PDSCH corresponding to MBMS within a certain BWP or within certain BWPs.

The gNB may configure only one cell-level "PDSCH time domain resource allocation list" that is applicable to all PDSCHs corresponding to MBMS in a cell.

The gNB may also not configure the cell-level list, and only configure the BWP-level "PDSCH time domain resource allocation list" for the cell. Each BWP level list is applicable to the MBMS corresponding PDSCH on one or more MBMS-bearing BWPs.

Specifically, one "PDSCH time domain resource allocation list" includes E "PDSCH time domain resource allocation items," and according to the sequence configured in the list, the subscripts of the E PDSCH time domain resource allocation items are respectively: 0 to E-1. Each "PDSCH time domain resource allocation entry" is composed of:

a1, k 0: the value is 0 or 1, and other positive integer values can be taken

a2, PDSCH mapping type: type a or type B.

a3, start symbol and Length indication RIV

Typically the maximum value of E is 16. Optionally, the value of E may be increased to refine the scene of PDSCH time domain resource allocation in MBMS or extend the scene of PDSCH time domain resource allocation in MBMS. And each PDSCH time domain resource allocation item corresponds to one PDSCH time domain resource allocation scene.

Under the condition of adopting a PDSCH time domain resource allocation list, when the value of a time domain resource allocation domain in a PDCCH for bearing PDSCH scheduling information is m, a PDSCH time domain resource allocation item with the subscript of m in the list is used, the time slot position of the PDSCH is determined according to the value of k0 in the item, the position S of a PDSCH starting symbol in a time slot indicated by k0 and the total number L of continuous symbols occupied by the PDSCH are determined according to the RIV value, and the information such as the position of a DMRS in the PDSCH is determined according to the PDSCH mapping type.

For each PDSCH transmission, after K PDSCH occasions are successfully allocated, time domain resources are allocated to the PDSCH within each PDSCH occasion.

When a PDSCH time domain resource allocation list is configured for the MBMS, allocating time domain resources to the PDSCH in each time machine based on the list; when the 'PDSCH time domain resource allocation list' is not configured for the MBMS, the table 1 or 2 determines a default table which needs to be adopted, and the time domain resources are allocated to the PDSCH in each time machine based on the determined default table.

For each PDSCH transmission, after determining the list or default table on which the time domain resource allocation is based in each occasion according to the above-described manner, the time domain resources may be allocated to the PDSCH in a unified manner in K occasions, or may be allocated to the PDSCH in each PDSCH occasion.

After time domain resources are successfully allocated to the PDSCH within one PDSCH scheduling machine, frequency domain resources are allocated to the PDSCH.

For each PDSCH transmission, when time domain resources are uniformly allocated to the PDSCH in corresponding K occasions, frequency domain resources can be uniformly allocated to the PDSCH in the K occasions, and frequency domain resources can also be respectively allocated to the PDSCH in each occasion. When time domain resources are respectively allocated to the PDSCH in each time machine, frequency domain resources are respectively allocated to the PDSCH in each time machine.

When the PDSCH is repeatedly transmitted V times, time domain resources may be uniformly allocated to K × V PDSCH occasions or may be allocated to each occasion respectively, in all PDSCH transmitters transmitting corresponding K × V PDSCH occasions, based on the determined list or default table. When time domain resources are uniformly allocated to K × V PDSCH occasions, frequency domain resources may be uniformly allocated to K × V occasions or frequency domain resources may be respectively allocated to each occasion.

For each PDSCH transmission, the K occasions allocated to the PDSCH may be continuously allocated K occasions or may be discretely allocated K occasions. Each time slot has only one opportunity, and the K consecutively allocated opportunities correspond to K consecutive time slots. When K discrete occasions are allocated for PDSCH, there are F slots spaced between any two occasions. The mapping mode and the initial symbol position of the PDSCH in each opportunity are the same as the number of occupied continuous symbols.

When PDSCH is repeatedly transmitted V times, K × V consecutive occasions may be allocated to PDSCH, or K × V discrete occasions may be allocated to PDSCH, with F slots between each occasion.

By the method, the opportunity can be allocated to the PDSCH bearing the MBMS, time domain resources and frequency domain resources are allocated to the PDSCH in each time machine, the PDSCH bearing the MBMS is sent in each allocated opportunity through the allocated time frequency resources, and the PDSCH in the K corresponding opportunities sent by the PDSCH is sent by the K wave beams respectively every time, so that the UE in the NR cell can receive the MBMS.

In the method shown in fig. 2, in step S205, the physical layer carries the MAC PDU as a transport block TB through the PDSCH, and one possible implementation manner of processing the PDSCH is: processing TB on the PDSCH, processing a demodulation reference signal DMRS of the PDSCH and processing a phase tracking reference signal PT-RS of the PDSCH. This will be explained in detail below.

Fig. 5 is a flowchart illustrating a method for processing a TB on a PDSCH by a physical layer according to the present application, where an execution subject of the method may be all or part of an apparatus for broadcasting an MBMS, and the apparatus for broadcasting an MBMS may be a 5G base station gNB, as shown in fig. 5, the method includes:

step S501, channel coding is carried out on TB on PDSCH.

Specifically, only one codeword can be carried on the PDSCH.

And step S502, carrying out bit scrambling on TB on the PDSCH.

In bit scrambling, the scrambling sequence generator is initialized with the following expression:

c _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID

Determining n _ID The way of the value may be one of three ways:

in a first way,

Is the physical layer cell ID of the cell broadcasting the current MBMS.

Second mode, allocating n to current MBMS in cell _ID 。

Mode three, uniformly distributing one n to current MBMS _ID This value is uniformly adopted by all NR cells broadcasting the current MBMS.

Mode four, configure n in units of regions _ID Each cell in a region uses the same n when broadcasting the MBMS _ID 。

Fifth, configure n with gNB-CU as unit _ID The cells controlled by each gNB-DU connected with gNB CU adopt n configured uniformly _ID 。

Sixth, let n _ID ＝0。

Step S503, modulating the TB on PDSCH.

A fixed MCS index table is adopted when determining the Modulation order, the target code rate and the spectral efficiency of a PDSCH carrying the MBMS according to the MCS index (Modulation and Coding Scheme, MCS for short).

The MCS index table is a table specifically set for MBMS through simulation, or any one of existing MCS index tables in 3GPP protocol.

And step S504, carrying out layer mapping on TB on the PDSCH.

Specifically, the PDSCH is transmitted using a single layer.

And step S505, carrying out antenna port mapping on TB on the PDSCH.

Specifically, a single antenna port is used to transmit PDSCH, such as antenna port 1000.

And step S506, carrying out VRB mapping on the TB on the PDSCH.

In VRB mapping, whether the PDSCH avoids demodulation reference signals DMRS of other UEs is determined as follows:

and whether the PDSCH carrying the MBMS avoids the DMRS of other UEs is specified in a 3GPP protocol, or whether the PDSCH carrying the MBMS avoids the DMRS of other UEs in VRB mapping is determined according to a first preset parameter, wherein the first preset parameter is used for indicating whether the PDSCH carrying the MBMS avoids the DMRS of other UEs in VRB mapping.

When determining whether the PDSCH carrying the MBMS avoids DMRSs of other UEs in VRB mapping according to the first preset parameter, the configuration manner of the first preset parameter may be one of the following manners:

mode one, per cell per MBMS level: the parameter is configured individually for each MBMS within each cell.

Mode two, per cell level: the parameters are uniformly configured for all MBMB services in the cell.

Mode three, each BWP stage: the parameter is configured uniformly for the MBMS broadcasted within a certain BWP within the cell.

Mode four, MBMS level: the parameter is configured uniformly for the same MBMS broadcast in several NR cells.

Mode five, regional level: the parameters are uniformly configured for the same MBMS in one area.

Mode six, at the gbb CU level: the gNB CU configures the parameters for one MBMS uniformly, and the parameters are suitable for each cell controlled by each gNB DU connected with the gNB DU.

When the configuration mode of the first preset parameter is the MBMS level, the core network or an entity newly added between the core network and the gNB needs to uniformly configure the parameter for the MBMS, and the uniformly configured parameter value is suitable for each NR cell broadcasting the same MBMS.

When the configuration mode of the first preset parameter is area level, the core network or an entity newly added between the core network and the gNB needs to uniformly configure the parameter for each cell in the area broadcasting the MBMS, and the uniformly configured parameter value is suitable for each NR cell in the area broadcasting the MBMS.

Step S507, mapping VRBs to physical resource blocks PRB for the TBs on the PDSCH, and generating a baseband signal.

And determining whether interleaving mapping is adopted in the mapping from the VRB to the PRB according to a second preset parameter.

If the second preset parameter is not configured, defaulting to: no interleaving mapping is used.

If the interleaving mapping is adopted in the mapping from VRBs to PRBs, the PRB Bundle length (PRB Bundle Size) is a fixed value, for example: PRB Bundle Size ═ 2, or, a configurable value.

When the PRB Bundle Size is configurable, the configuration mode is one of the following modes:

mode one, per cell per MBMS level: configuring the parameter individually for each MBMS in each cell

Mode two, cell level: the parameter is uniformly configured for all MBMB services in the cell

Mode three, BWP stage: uniformly configuring the parameter for MBMS broadcast in a certain BWP in a cell

Mode four, MBMS level: uniformly configuring the parameter for the same MBMS broadcast in a plurality of NR cells

Mode five, area level: the parameters are uniformly configured for the same MBMS in one area.

Mode six, gNB CU level: the gNB CU configures the parameters for one MBMS uniformly, and the parameters are suitable for each cell controlled by each gNB DU connected with the gNB DU.

When the configuration mode of the PRB Bundle Size is MBMS level, the core network or an entity newly added between the core network and the gNB needs to uniformly configure the parameter for the current MBMS, and the uniformly allocated parameter value is suitable for each NR cell broadcasting the same MBMS.

When the allocation mode of the PRB Bundle Size is in the area level, the core network or an entity newly added between the core network and the gNB needs to allocate the parameter uniformly for each cell in the area broadcasting the current MBMS, and the uniformly allocated parameter value is suitable for each NR cell in the area broadcasting the current MBMS.

If the PDSCH adopts interleaving mapping in the mapping from VRBs to PRBs, the total number of PRB bundles (PRB bundles) in different scenes and the number of resource blocks RB included in any PRB Bundle are determined according to the following method according to the search space in which the PDCCH for scheduling the PDSCH is located and the control resource set CORESET.

Scene one: the PDCCH is mapped to CORESET 0.

When the PDCCH is mapped on CORESET0, determining the total number N of PRB bundles according to the following expression _bundle ：

Wherein the content of the first and second substances,

denotes the number of RBs included in CORESET0, L ═ 2.

Correspondingly, the number of resource blocks RB included in each PRB Bundle is determined according to the following method:

if it is

mod L; otherwise, the subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs L;

the PRB Bundle of the other subscripts includes the number of RBs L.

Scene two: the PDCCH is mapped to a common search space on the initial BWP, and the common search space is independent of the CORESET 0.

When the PDCCH is mapped to a common search space on an initial BWP and the common search space is irrelevant to the CORESET0, determining the total number N of PRB bundles according to the following expression _bundle ：

Wherein, the first and the second end of the pipe are connected with each other,

indicates the number of RBs included in the initial BWPWhen the CORESET0 is configured in the cell,

equal to the number of RBs included in said CORESET0, when said CORESET0 is not configured by a cell,

for the number of RBs included for the initial BWP,

indicating the start of the initial BWP as a position,

denotes a start position of the common search space to which the PDCCH is mapped in the initial BWP, and L ═ 2. Correspondingly, the number of resource blocks RB included in each PRB Bundle is determined according to the following method:

the PRB Bundle with subscript 0 includes the number of RBs:

subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs:

if it is

Subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs:

otherwise subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs: l; the PRB Bundle of the other subscripts includes the number of RBs L.

Scene three: when the PDCCH is mapped to a common search space on non-initial BWP

Wherein the content of the first and second substances,

indicates the number of RBs, L, included in the BWP _i Representing the number of RBs included in the PRB Bundle;

indicating the starting position of the corresponding BWP.

the PRB Bundle with subscript 0 includes the number of RBs:

when in use

When the subscript is N _bundle The number of RBs included in the PRB Bundle of-1 is:

otherwise subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs: l is _i 。

Other subscripted PRB Bundle comprises L RB number _i 。

Fig. 6 is a flowchart illustrating a method for processing a demodulation reference signal DMRS for a PDSCH by a physical layer according to the present application, where an execution subject of the method may be all or part of a device broadcasting an MBMS, and the device broadcasting the MBMS may be a 5G base station gNB, as shown in fig. 6, the method includes the following steps:

and step S601, generating a DMRS sequence.

When initializing the pseudo-random sequence generator according to the following expression, the parameters in the following formula need to be configured according to the values given by the present invention or according to the configuration manner given by the present invention.

Wherein, l is subscript of symbol in time slot, n _SCID Is a subscript of the scrambling ID,

indicates the number of symbols included in 1 slot,

a subscript of 1 slot in a radio frame when a Sub-carrier Spacing (SCS) parameter is u,

is the scrambling ID with subscript 0.

Wherein the content of the first and second substances,

the configuration may be done in one of the following ways:

the first method,

Is the physical layer cell ID of the cell broadcasting the MBMS.

Second mode, configuring current MBMS in cell

Each NR cell is configured independently.

Mode three, uniformly configuring the current MBMS

This value is uniformly adopted by all NR cells broadcasting the current MBMS.

The fourth way, using area as unit, uniformly configuring the parameter for the same MBMS in one area,each NR cell in a region has the same

In a fifth mode, the gNB CU configures the parameter for one MBMS in a unified manner, and the parameter is applicable to each cell controlled by each gNB DU connected to the gNB DU.

In the third method, the core network or the entity newly added between the core network and the gNB is required to configure the parameter for one MBMS in a unified way.

In the fourth method, the core network or the entity newly added between the core network and the gNB needs to configure the parameter uniformly for each cell in the area broadcasting the MBMS.

Step S602, the DMRS sequence is mapped to the physical resource indicated by the PDSCH resource configuration information.

Here, only one antenna port, for example, antenna port 1000, is used for mapping the DMRS sequence to the physical resource.

When the DMRS is mapped to physical resources, determining the configuration type of the DMRS according to the following modes:

the configuration type of the DMRS is specified in the 3GPP protocol, or determined by a third preset parameter, where the third preset parameter is used for indicating the configuration type of the DMRS.

When the configuration type of the DMRS is determined by the third parameter, the configuration manner of the third preset parameter may be one of the following manners:

Mode four, MBMS level: the parameter is configured uniformly for MBMS broadcast in several NR cells.

Mode five, area level: the parameters are uniformly allocated to the same MBMS within one area.

When the configuration mode of the third preset parameter is MBMS level, the parameter needs to be uniformly configured by the core network or an entity newly added between the core network and the gNB, and the uniformly configured parameter value is suitable for each NR cell broadcasting the same MBMS.

When the configuration mode of the third preset parameter is area level, the core network or an entity newly added between the core network and the gNB needs to uniformly configure the parameter for the area broadcasting the MBMS, and the uniformly configured parameter value is suitable for each NR cell in the area broadcasting the MBMS.

Fig. 7 is a flowchart illustrating a processing method of a physical layer for PT-RS of PDSCH provided in the present application, where an execution subject of the method may be all or part of a device broadcasting MBMS, and the device broadcasting MBMS may be a 5G base station gNB. Of course, it is also possible to specify in the 3GPP protocol: the PDSCH carrying MBMS is not configured with PT-RS.

As shown in fig. 7, a method for processing PT-RS of PDSCH by a physical layer according to the present application includes:

and step S701, generating a PT-RS sequence.

Step S702, mapping the PT-RS sequence to the physical resource indicated by the PDSCH resource configuration information.

Specifically, the mapping of the PT-RS in the time domain and the frequency domain is based on the time density LPT-RS and the frequency density KPT-RS, respectively.

When the time density related parameters and the frequency density related parameters are configured simultaneously, the time density LPT-RS of the PT-RS and the frequency density KPT-RS of the PT-RS are respectively functions of a modulation coding method MCS adopted by the PDSCH, and a time density Table (namely, 3GPP TS38.214Table 5.1.6.3-1) of the PT-RS and a frequency density Table (3GPP TS38.214Table 5.1.6.3-2) of the PT-RS are respectively checked according to the scheduled MCS to determine corresponding parameter values.

When the time density-related parameter and the frequency density-related parameter are not configured, mapping is performed in accordance with the time density LPT-RS ═ 1 and the frequency density KPT-RS ═ 2. However, when the scheduled MCS is less than 10 or the scheduled RB total number is less than 3, no PT-RS process is as follows.

By the processing method for the TB on the PDSCH, the processing method for PDSCH DMRS and the processing method for the PDSCH PT-RS, the PDSCH for bearing the MBMS can be broadcasted to all the UE in the NR cell, so that all the UE in the cell can receive the PDSCH.

The following provides an apparatus, a device and a storage medium for broadcasting MBMS in NR cell, and the effect thereof can refer to the effect corresponding to the above image recognition method, which is not described in detail below.

Fig. 8 is a schematic structural diagram of an apparatus for broadcasting MBMS in an NR cell according to the present application, where as shown in fig. 8, the apparatus includes:

a receiving module 81, configured to receive data of a multimedia broadcast multicast MBMS that arrives in a protocol data unit session PDU session, where the MBMS is uniquely identified by a group-radio network temporary identifier G-RNTI.

And the processing module 82 is used for processing the PDU Session of the MBMS layer by layer through the user plane protocol stack until the PDU Session reaches a Radio Link Control (RLC) layer of the user plane protocol stack. The processing module 82 is further configured to process the RLC SDU on the RLC channel by the RLC entity of the RLC layer, generate an RLC PDU, and send the RLC PDU to the MAC layer of the user plane protocol stack through the corresponding logical channel SC-MTCH. The processing module 82 is further configured to allocate, by the MAC entity in the MAC layer, PDSCH resources of a physical downlink shared channel and PDCCH resources of a physical downlink control channel to the MAC SDU carried on the SC-MTCH, the MAC entity further generates an MAC PDU from the MAC SDU according to the allocated PDSCH resources, sends the MAC PDU to the physical layer through a corresponding downlink transport channel DL-SCH, and the MAC entity further generates PDSCH scheduling information according to the allocated PDSCH resources, and sends the PDSCH scheduling information, PDSCH resource allocation information, and PDCCH resource allocation information to the physical layer. The processing module 82 is further configured to, by the physical layer, use the MAC PDU as a transport block TB to be carried by the PDSCH, process the PDSCH, broadcast the PDSCH in the NR cell through the allocated PDSCH resources, and broadcast the PDCCH through the allocated PDCCH resources, where the PDCCH carries scheduling information of the PDSCH.

Optionally, the processing module 82 is specifically configured to establish an SDAP entity, a PDCP entity, and an RLC entity; the PDU Session is mapped to a corresponding radio bearer RB through the processing of an SDAP entity; the PDCP SDUs on the RB are mapped onto the corresponding RLC channel through the processing of the PDCP entity.

Optionally, the processing module 82 is specifically configured to establish an SDAP entity and an RLC entity; the PDU Session is mapped to the corresponding RLC channel through the SDAP entity.

Optionally, the processing module 82 is specifically configured to process a TB on the PDSCH, process a DMRS on the PDSCH, and process a PT-RS on the PDSCH.

Optionally, the processing module 82 is specifically configured to perform, by the physical layer, channel coding, bit scrambling, modulation, layer mapping, antenna port mapping, virtual resource block VRB mapping, mapping from a VRB to a physical resource block PRB, and generating a baseband signal for the TB on the PDSCH.

Optionally, the processing module 82 is specifically configured to initialize, in bit scrambling, the scrambling sequence generator according to the following expression:

c _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID

Optionally, the processing module 82 is specifically configured to adopt a fixed MCS index table when determining, according to the MCS index, a modulation order, a target code rate, and spectral efficiency of a PDSCH carrying the MBMS; the MCS index table is a table specifically set for the MBMS through simulation, or any one of MCS index tables existing in the 3GPP protocol.

The PDSCH is transmitted in a single layer.

The PDSCH is transmitted using a single antenna port.

Optionally, the processing module 82 is specifically configured to determine whether the PDSCH avoids demodulation reference signals DMRSs of other UEs in the VRB mapping by using the following method: and whether the PDSCH carrying the MBMS avoids the DMRS of other UEs is specified in a 3GPP protocol, or whether the PDSCH carrying the MBMS avoids the DMRS of other UEs in VRB mapping is determined according to a first preset parameter, wherein the first preset parameter is used for indicating whether the PDSCH carrying the MBMS avoids the DMRS of other UEs in VRB mapping.

Optionally, the processing module 82 is specifically configured to determine whether to adopt interleaving mapping in the mapping from the VRB to the PRB according to a second preset parameter, where the second preset parameter is used to indicate whether to adopt interleaving mapping in the mapping from the VRB to the PRB; if the interleaving mapping is adopted in the mapping from the VRB to the PRB, the PRB Bundle Size is a fixed value or a configurable value; if non-interleaved mapping is adopted in the mapping from the VRB to the PRB, the total number of the PRB Bundle and the number of the Resource Blocks (RBs) included in any PRB Bundle are determined according to a search space where the PDCCH is located and a control resource set CORESET.

Optionally, the processing module 82 is specifically configured to determine, when the PDCCH is mapped to the CORESET0, the total number N of PRB bundles according to the following expression _bundle ：

represents the number of RBs included in CORESET0, L ═ 2; accordingly, if

mod L > 0, then the subscript is N _bundle The number of RBs included in the PRB Bundle of-1 is:

mod L; otherwise, the subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs of L; the PRB Bundle of the other subscripts includes the number of RBs L.

When the PDCCH is mapped to a common search space on the initial BWP and the common search space is irrelevant to CORESET0, determining the total number N of PRB bundles according to the following expression _bundle ：

Wherein the content of the first and second substances,

for the number of RBs included for the initial BWP,

indicating the start of the initial BWP as the location,

indicating a starting position of a common search space to which a PDCCH is mapped in the initial BWP, where L is 2; accordingly, a PRB Bundle with subscript 0 includes the number of RBs as:

if it is

Subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs:

otherwise, the subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs: l; the PRB Bundle of the other subscripts includes the number of RBs L.

Wherein the content of the first and second substances,

denotes the number of RBs included in a BWP having a subscript i, L _i Represents the number of RBs included in the PRB Bundle;

indicating a start position of the corresponding BWP; accordingly, a PRB Bundle with subscript 0 includes the number of RBs as:

when in use

When the subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs:

otherwise, the subscript is N _bundle The PRB Bundle of-1 comprises the number of RBs: l is _i And the number of RBs included in other subscripted PRB Bundle is L _i 。

Optionally, the processing module 82 is specifically configured to generate a DMRS sequence; and mapping the DMRS sequence to the physical resource indicated by the PDSCH resource configuration information.

where l denotes the index of the symbol in the slot, n _SCID A subscript indicating the scrambling ID is attached to,

indicates the number of symbols included in 1 slot,

the index of 1 slot in the radio frame when the SCS parameter is u,

is the scrambling ID with subscript 0.

Wherein the content of the first and second substances,

the configuration may be performed in one of the following ways:

is the physical layer cell ID of the cell broadcasting the MBMS.

Configuring MBMS broadcast in a cell in units of the cell

Each NR cell is configured independently.

The core network or the entity newly added between the core network and the gNB is a MBMS unified configuration

All NR cells broadcasting the same MBMS uniformly adopt the same

In or on the core networkThe newly added entity between the network and the gNB takes the area as a unit and configures the MBMS broadcast in the area

Each NR cell in a region uses the same

gNB CU is uniformly configured for one MBMS

Each of the NR cells controlled by each of the gNB DUs connected to the gNB CU uses the same

Mapping the DMRS sequences to physical resources indicated by the PDSCH resource configuration information, wherein the DMRS sequences comprise: only one antenna port is adopted when the DMRS sequence is mapped to the physical resource; when the DMRS is mapped to physical resources, determining the configuration type of the DMRS according to the following modes: the configuration type of the DMRS is specified in a 3GPP protocol or determined through a third parameter, and the third parameter is used for indicating the configuration type of the DMRS.

Optionally, the processing module 82 is specifically configured to generate a PT-RS sequence; and mapping the PT-RS sequence to physical resources indicated by the PDSCH resource configuration information according to the time density LPT-RS and the frequency density KPT-RS.

When the time density related parameters and the frequency density related parameters are configured at the same time, the time density LPT-RS of the PT-RS and the frequency density KPT-RS of the PT-RS are respectively functions of a Modulation and Coding method MCS adopted by the PDSCH, and a time density Table of the PT-RS of 3GPP TS38.214Table5.1.6.3-1 and a frequency density Table of the PT-RS of 3GPP TS38.214Table 5.1.6.3-2 are checked respectively according to a Modulation and Coding Scheme (MCS for short) for scheduling to determine corresponding parameter values.

When the time density related parameter and the frequency density related parameter are not configured, mapping is performed according to time density LPT-RS which is 1 and frequency density KPT-RS which is 2; however, when the scheduled MCS is less than 10 or the scheduled RB total number is less than 3, no PT-RS processing is required.

Optionally, the processing module 82 is specifically configured to, in K timeslots allocated for PDSCH transmission each time, transmit the PDSCH by using K beams in the physical layer, where the PDSCH is transmitted by using allocated time-frequency resources in each timeslot, K is the number of beams used by the SS/PBCH block in the NR cell broadcasting the MBMS, and K beams are K beams used by the SS/PBCH block in the NR cell broadcasting the MBMS.

Optionally, the processing module 82 is specifically configured to determine, by the MAC entity in the MAC layer, the number of times of PDSCH transmission, allocate K occasions for each PDSCH transmission, and allocate time-frequency resources to the PDSCH in each occasion; the PDSCH is used to carry MAC PDUs, and may be repeatedly transmitted multiple times.

Fig. 9 is a schematic structural diagram of an apparatus for broadcasting an MBMS in an NR cell according to the present application, where as shown in fig. 9, the apparatus may be a base station, and specifically includes: at least one processor 91; and a memory 92 communicatively coupled to the at least one processor; wherein the memory 92 stores instructions executable by the at least one processor 91 to enable the at least one processor 91 to perform the method according to any of the above method embodiments.

Optionally, the method further includes: a transceiver 93 for enabling communication with other devices.

The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored, and when executed by a processor, the computer-executable instructions are used for implementing the method according to any one of the above method embodiments.

It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for broadcasting MBMS in an NR cell, comprising:

receiving data of a multimedia broadcast multicast MBMS which arrives in a protocol data unit PDU conversation mode, wherein the MBMS is uniquely identified by a group-radio network temporary identifier G-RNTI;

the PDU conversation of the MBMS is processed layer by layer through a user plane protocol stack until a Radio Link Control (RLC) layer of the user plane protocol stack is reached;

the RLC entity of the RLC layer processes RLC service data units SDU on an RLC channel to generate RLC PDUs, and the RLC PDUs are sent to a Media Access Control (MAC) layer of the user plane protocol stack through corresponding logical channels SC-MTCH;

the MAC entity of the MAC layer distributes Physical Downlink Shared Channel (PDSCH) resources and Physical Downlink Control Channel (PDCCH) resources for MAC SDUs (physical downlink shared channel) borne on the SC-MTCH, the MAC entity generates MAC PDUs (media access control data units) according to the distributed PDSCH resources, sends the MAC PDUs to the physical layer through a corresponding downlink transmission channel (DL-SCH), generates PDSCH scheduling information according to the distributed PDSCH resources, and sends the PDSCH scheduling information, the PDSCH resource distribution information and the PDCCH resource distribution information to the physical layer;

the physical layer takes the MAC PDU as a transport block TB and carries the MAC PDU through the PDSCH, processes the PDSCH, broadcasts the PDSCH in an NR cell through the distributed PDSCH resources, and also broadcasts the PDCCH through the distributed PDCCH resources, and the PDCCH carries scheduling information of the PDSCH;

the physical layer takes the MAC PDU as a transport block TB to be carried by the PDSCH, and processes the PDSCH, wherein the process comprises the following steps:

processing the TB on the PDSCH, processing a demodulation reference signal (DMRS) of the PDSCH and processing a phase tracking reference signal (PT-RS) of the PDSCH.

2. The method of claim 1, wherein the PDU session is processed layer by layer through a user plane protocol stack until reaching a radio link control, RLC, layer of the user plane protocol stack, comprising:

establishing an SDAP entity, a PDCP entity and an RLC entity;

the PDU session is mapped to a corresponding radio bearer RB through the processing of an SDAP entity;

and the PDCP SDU on the RB is mapped to a corresponding RLC channel through the processing of a PDCP entity.

3. The method of claim 1, wherein the PDU session is processed layer by layer through a user plane protocol stack until reaching a radio link control, RLC, layer of the user plane protocol stack, comprising:

establishing an SDAP entity and an RLC entity;

the PDU session is mapped onto a corresponding RLC channel through the processing of the SDAP entity.

4. The method of claim 1, wherein the processing of the TB on the PDSCH by the physical layer comprises:

and the physical layer carries out channel coding, bit scrambling, modulation, layer mapping, antenna port mapping, virtual resource block VRB mapping, mapping from VRB to physical resource block PRB and generation of baseband signals on the TB on the PDSCH.

5. The method of claim 4, wherein the physical layer bit scrambles the TBs on the PDSCH, comprising:

in the bit scrambling, the scrambling sequence generator is initialized with the following expression:

C _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID

wherein q is a subscript of a TB carried on the PDSCH, and for the PDSCH carrying the MBMS, the PDSCH can only carry one codeword, where q is 0, and n is a subscript of the codeword _RNTI A receiving side for identifying PDSCH, n is when the PDSCH bears MBMS _RNTI G-RNTI for indicating MBMS carried on current PDSCH, n _ID E {0, 1.., 1023} is the PDSCH scrambling ID.

6. The method of claim 4, wherein the physical layer modulating, layer mapping, antenna port mapping the TBs on the PDSCH comprises:

adopting a fixed MCS subscript table when determining the modulation order, the target code rate and the spectral efficiency of the PDSCH bearing the MBMS according to the MCS subscript;

the MCS subscript table is a table specially set for the MBMS through simulation, or any table in the existing MCS subscript tables in a 3GPP protocol;

transmitting the PDSCH using a single layer;

and transmitting the PDSCH by adopting a single antenna port.

7. The method of claim 4, wherein the physical layer VRB maps the TB on the PDSCH, comprising:

in VRB mapping, determining whether the PDSCH avoids demodulation reference signals, DMRSs, of other UEs as follows:

and the method comprises the steps of stipulating whether a PDSCH bearing the MBMS avoids DMRS of other UE or not in a 3GPP protocol, or determining whether the PDSCH bearing the MBMS avoids the DMRS of other UE in VRB mapping or not according to a first preset parameter, wherein the first preset parameter is used for indicating whether the PDSCH bearing the MBMS avoids the DMRS of other UE in VRB mapping or not.

8. The method of claim 4, wherein the physical layer VRB-to-PRB mapping of the TBs on the PDSCH comprises:

determining whether interleaving mapping is adopted in the mapping from the VRB to the PRB according to a second preset parameter, wherein the second preset parameter is used for indicating whether the mapping from the VRB to the PRB adopts interleaving mapping;

if interleaving mapping is adopted in the mapping from the VRB to the PRB, the size of the PRB bundle is a fixed value or a configurable value;

and if interleaving mapping is adopted in the mapping from VRB to PRB, determining the total number of PRB bundles and the number of Resource Blocks (RBs) included in any PRB bundle according to a search space where the PDCCH is located and a control resource set (CORESET), wherein the PDCCH carries the PDSCH scheduling information.

9. The method of claim 8, wherein if interleaving mapping is adopted in mapping VRBs to PRBs, determining the total number of PRB bundles and the number of resource blocks RB included in any PRB bundle according to a search space in which the PDCCH is located and a control resource set CORESET, comprises:

determining a total number N of PRB bundles according to the following expression when the PDCCH is mapped onto CORESET0 _bundle ：

Wherein the content of the first and second substances,

represents the CORESET0 packageThe number of RB included, L ═ 2;

accordingly, if

Then the subscript is N _bundle The PRB bundle of-1 includes the number of RBs:

otherwise, the subscript is N _bundle The PRB bundle of-1 comprises the number of RBs of L; the number of RBs included in the PRB bundles of other subscripts is L;

when the PDCCH is mapped to a common search space on an initial bandwidth slice BWP and the common search space is irrelevant to CORESET0, determining the total number N of PRB bundles according to the following expression _bundle ：

indicating the number of RBs included in the initial BWP, and when the cell is configured with the core set0,

for the number of RBs included for the initial BWP,

indicating the start of the initial BWP as a position,

represents a starting point of the common search space to which the PDCCH is mapped in initial BWPStarting position, L ═ 2;

accordingly, a PRB bundle with subscript 0 includes the number of RBs as:

if it is

Subscript is N _bundle The PRB bundle of-1 includes the number of RBs:

otherwise, the subscript is N _bundle The PRB bundle of-1 comprises the number of RBs: l; the number of RBs included in the PRB bundles of other subscripts is L;

denotes the number of RBs included in a BWP having a subscript i, L _i Represents the number of RBs included in a PRB bundle;

indicating the starting position of the corresponding BWP;

accordingly, a PRB bundle with subscript 0 includes the number of RBs as:

when in use

otherwise, the subscript is N _bundle The PRB bundle of-1 includes the number of RBs: l is _i Other subscripted PRB bundle includes L number of RBs _i 。

10. The method of claim 1, wherein the processing by the physical layer of the DMRS for the PDSCH comprises:

generating a DMRS sequence;

mapping the DMRS sequence to physical resources indicated by the PDSCH resource configuration information;

wherein the generating of the DMRS sequence includes:

initializing a pseudo-random sequence generator according to the following expression:

where l denotes the index of the symbol within the slot, n _SCID Subscript, n, representing scrambling ID _SCID ＝0，

Indicates the number of symbols included in 1 slot,

index of 1 time slot within a radio frame indicating the subcarrier spacing SCS parameter as u,

is a scrambling ID with subscript 0;

the configuration may be performed in one of the following ways:

a physical layer cell ID that is a cell broadcasting MBMS;

configuring MBMS broadcast in a cell in units of the cell

Each NR cell is configured independently;

All NR cells broadcasting the same MBMS uniformly adopt the same

Using the same for each NR cell within a region

gNB central unit CU is uniformly configured for one MBMS

Each gNB distribution unit DU connected with the gNB CU uses the same NR cell controlled by the gNB CU

The mapping the DMRS sequences to the physical resources indicated by the PDSCH resource configuration information comprises:

only one antenna port is adopted when the DMRS sequence is mapped to the physical resource;

the configuration type of the DMRS is specified in a 3GPP protocol or determined through a third parameter, and the third parameter is used for indicating the configuration type of the DMRS.

11. The method of claim 1, wherein the processing of the PT-RS of the PDSCH by the physical layer comprises:

generating a PT-RS sequence;

mapping the PT-RS sequence to physical resources indicated by the PDSCH resource configuration information according to time density (LPT-RS) and frequency density (KPT-RS);

when the time density related parameters and the frequency density related parameters are configured at the same time, the time density LPT-RS of the PT-RS and the frequency density KPT-RS of the PT-RS are respectively functions of a modulation coding method MCS adopted by the PDSCH, and a time density Table of the PT-RS of 3GPP TS38.214table5.1.6.3-1 and a frequency density Table of the PT-RS of 3GPP TS38.214Table 5.1.6.3-2 are respectively checked according to the modulation coding method MCS scheduled to determine corresponding parameter values;

when only the time density related parameters are configured, the time density table of the PT-RS is checked to determine the LPT-RS, and mapping of a frequency domain is performed according to KPT-RS which is 2;

when only parameters related to frequency density are configured, a frequency density table of the PT-RS is checked to determine the KPT-RS, and time domain mapping is carried out according to the LPT-RS which is 1;

when the time density-related parameter and the frequency density-related parameter are not configured, performing mapping according to a time density LPT-RS (1) and a frequency density KPT-RS (2); however, when the scheduled MCS is less than 10 or the scheduled RB total number is less than 3, no PT-RS processing is required.

12. The method of claim 1, wherein the physical layer broadcasts the PDSCH in the NR cell via allocated PDSCH resources, comprising:

in K time frames allocated for sending the PDSCH every time, a physical layer respectively adopts K wave beams to send the PDSCH, the PDSCH adopts allocated time-frequency resources to send in each time frame, the K is the number of wave beams adopted by a synchronous signal/physical broadcast channel block SS/PBCH block in an NR cell broadcasting the MBMS, and the K wave beams are the K wave beams adopted by the SS/PBCH block in the NR cell broadcasting the MBMS.

13. The method of claim 1, wherein the MAC entity of the MAC layer allocates PDSCH resources of a Physical Downlink Shared Channel (PDSCH) for MAC SDUs carried on the SC-MTCH, and wherein the allocating comprises:

the MAC entity of the MAC layer determines the sending times of the PDSCH, allocates K occasions for each PDSCH sending, and allocates time-frequency resources for the PDSCH in each occasion; the PDSCH is used to carry MAC PDUs, and may be repeatedly transmitted multiple times.

14. An apparatus for broadcasting MBMS in an NR cell, comprising:

the system comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving data of a Multimedia Broadcast Multicast Service (MBMS) which arrives in a Protocol Data Unit (PDU) conversation mode, and the MBMS is uniquely identified through a group-radio network temporary identifier (G-RNTI);

the processing module is used for processing the PDU conversation of the MBMS layer by layer through a user plane protocol stack until a Radio Link Control (RLC) layer of the user plane protocol stack is reached;

the RLC entity of the RLC layer processes an RLC service data unit SDU on an RLC channel to generate an RLC PDU, and the RLC PDU is sent to a Media Access Control (MAC) layer of the user plane protocol stack through a corresponding logical channel SC-MTCH;

the MAC entity of the MAC layer distributes Physical Downlink Shared Channel (PDSCH) resources and Physical Downlink Control Channel (PDCCH) resources to MAC SDUs (physical downlink shared channel) borne on the SC-MTCH, the MAC entity generates MAC PDUs (media access control protocol data units) according to the distributed PDSCH resources, sends the MAC PDUs to the physical layer through a corresponding downlink transmission channel (DL-SCH), and generates PDSCH scheduling information according to the distributed PDSCH resources and sends the PDSCH scheduling information, the PDSCH resource distribution information and the PDCCH resource distribution information to the physical layer;

processing a transport block TB on the PDSCH, processing a demodulation reference signal DMRS on the PDSCH and processing a phase tracking reference signal PT-RS on the PDSCH, broadcasting the PDSCH in an NR cell through the allocated PDSCH resources, broadcasting the PDCCH through the allocated PDCCH resources by the physical layer, and carrying scheduling information of the PDSCH on the PDCCH.

15. An apparatus for broadcasting MBMS in an NR cell, comprising: at least one processor and memory;

the memory stores computer execution instructions;

the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of broadcasting MBMS in NR cells of any of claims 1 to 13.

16. A computer readable storage medium having stored thereon computer executable instructions which, when executed by a processor, implement a method of broadcasting MBMS in NR cells as claimed in any of claims 1 to 13.