CN113453163B

CN113453163B - Method and device for sending SC-PTM configuration information in NR cell

Info

Publication number: CN113453163B
Application number: CN202010231502.0A
Authority: CN
Inventors: 魏立梅; 袁乃华; 陈迎; 范晨; 朱玉梅; 周志宏
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2023-01-31
Anticipated expiration: 2040-03-27
Also published as: CN113453163A

Abstract

The embodiment of the invention provides a method and equipment for sending SC-PTM configuration information in an NR cell, wherein the method comprises the steps that for the NR cell which broadcasts MBMS in an SC-PTM mode, according to a protocol stack, an RRC layer RRC entity generates SC-PTM configuration information and sends the configuration information to a next layer of the protocol stack for processing, and subsequent layers of the protocol stack sequentially process the configuration information, wherein, an MAC layer MAC entity distributes PDSCH resources and PDCCH resources to the configuration information from the previous layer, generates MAC PDU from the configuration information from the previous layer, a physical layer carries the MAC PDU through PDSCH to process the PDSCH, and respectively sends PDSCH carrying the configuration information and PDCCH carrying PDSCH scheduling information through the distributed PDSCH resources and PDCCH resources.

Description

Method and device for sending SC-PTM configuration information in NR cell

Technical Field

The embodiment of the invention relates to the technical field of data transmission, in particular to a method and equipment for sending SC-PTM configuration information in an NR cell.

Background

MBMS (Multimedia Broadcast Multicast Service) is a typical Service supported by an LTE (Long Term Evolution) system in 3GPP (The 3rd Generation Partnership Project) protocol, and The Service may be transmitted to a specific UE through a unicast Bearer or Broadcast within a cell through an MBMS Bearer (MBMS Bearer). The mode of broadcasting the MBMS through the MBMS bearer comprises the following steps: MBSFN (Multimedia Broadcast multicast service Single Frequency Network) mode and SC-PTM (Single Cell Point To multicast, single Cell Point To multipoint) mode. In order to enable the UE in the cell to receive the MBMS broadcast in the SC-PTM mode, SC-PTM configuration information needs to be broadcast in the cell, wherein the information is a set of configuration information of each MBMS sent in the SC-PTM mode in the current cell. The UE may receive a corresponding MBMS according to the configuration information of the MBMS.

As the wireless internet age has started, wireless internet has put more diverse demands on the development of wireless networks, including higher system throughput, lower transmission delay, higher reliability, and more user connection counts. To meet these demands, 5G systems have come into force. The gNB is a base station of the 5G system, and a cell controlled by the gNB is referred to as an NR (New radio Access) cell. Currently, 5G systems do not support broadcasting SC-PTM configuration information within one NR cell.

Disclosure of Invention

The embodiment of the invention provides a sending method and Equipment of SC-PTM configuration information in an NR (non-reciprocal) cell, which are used for broadcasting the SC-PTM configuration information in the NR cell so that User Equipment (UE) in the cell receives a corresponding MBMS according to any MBMS configuration information in the received SC-PTM configuration information.

In a first aspect, an embodiment of the present invention provides a method for sending SC-PTM configuration information in an NR cell, including: for a new radio access NR cell which broadcasts a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM mode, generating SC-PTM configuration information by a radio resource control RRC layer RRC entity according to a protocol stack, wherein the SC-PTM configuration information is a set of configuration information of each MBMS broadcast in the NR cell in the SC-PTM mode; the RRC entity sends the SC-PTM configuration information to the next layer in the protocol stack for processing, and the other layers of the protocol stack sequentially carry out the processing of the layer from the previous layer to the SC-PTM configuration information processed by the previous layer from the next layer of the protocol stack according to the sequence from top to bottom until the SC-PTM configuration information reaches the Media Access Control (MAC) layer of the protocol stack through the processing of the other layers; according to the protocol stack, an MAC entity of an MAC layer allocates Physical Downlink Shared Channel (PDSCH) resources and Physical Downlink Control Channel (PDCCH) resources for a radio link control protocol data unit (RLC PDU), the RLC PDU generates a media access control protocol data unit (MAC PDU), and the MAC PDU, PDSCH scheduling information, PDSCH resource allocation information and PDCCH resource allocation information are sent to a physical layer of the protocol stack, wherein the PDSCH resources are used for sending a PDSCH bearing the MAC PDU, the PDSCH scheduling information is generated by the PDSCH resource allocation information, and the PDCCH resources are used for sending a PDCCH bearing the PDSCH scheduling information; and the physical layer takes the MAC PDU as a transmission block TB and carries the MAC PDU through a PDSCH, processes the PDSCH, sends the PDSCH through the wireless resource indicated by the PDSCH resource allocation information, carries the SC-PTM configuration information on the PDSCH, and sends a corresponding PDCCH through the wireless resource indicated by the PDCCH resource allocation information, and carries the scheduling information of the PDSCH on the PDCCH.

Optionally, the sending, by the RRC entity, the SC-PTM configuration information to a next layer in the protocol stack for processing, and sequentially performing, by starting from the next layer in the protocol stack, processing of a current layer on the SC-PTM configuration information that is processed by a previous layer and that is from the previous layer according to an order from top to bottom by other layers of the protocol stack includes: establishing a packet data convergence protocol PDCP entity, an RLC entity and an MAC entity according to the protocol stack respectively; taking the SC-PTM configuration information as data on a special Signaling Radio Bearer (SRB) (signaling Radio Bearer), and transmitting the data to the PDCP entity by the RRC entity in an RRC layer for processing to generate a PDCP PDU; the PDCP entity transmits the generated PDCP PDU to the RLC entity through an RLC channel; and the RLC entity processes the PDCP PDU on the RLC channel to generate the RLC PDU and sends the RLC PDU to the MAC entity of the cell through a single-cell multicast control channel SC-MCCH.

Optionally, the sending the SC-PTM configuration information of the current cell generated by the RRC layer RRC entity in the protocol stack to the next layer in the protocol stack for processing, and sequentially performing, from the next layer in the protocol stack to the other layers in the protocol stack according to an order from top to bottom, processing of the current layer on the SC-PTM configuration information from the previous layer and processed by the previous layer, includes: according to the protocol stack, an RRC layer RRC entity establishes an RLC entity and an MAC entity; transmitting the SC-PTM configuration information to the RLC entity by the RRC entity in the RRC layer through an RLC channel; and the RLC entity generates an RLC PDU from the SC-PTM configuration information and sends the RLC PDU to the MAC entity through the SC-MCCH.

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

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, VRB to PRB mapping, baseband signal generation, and carrier modulation and up-conversion of baseband signals on TBs on PDSCHs.

Optionally, the bit scrambling of the TB on the PDSCH by the physical layer includes: in bit scrambling, the scrambling sequence generator is initialized with the following expression:

c _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID (ii) a Wherein q is a subscript of a TB carried on the PDSCH, and for the PDSCH carrying SC-PTM configuration information, 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 carries SC-PTM configuration information _RNTI = SC-RNTI is used for indicating that the logical channel corresponding to the current PDSCH is SC-MCCH or the carried information is SC-PTM configuration information, n _ID E {0,1.., 1023} isPDSCH scrambles the ID, and n _ID Is determined in any one of the following ways:

is the physical layer cell ID of the current cell; allocating n to PDSCH corresponding to SC-MCCH in cell _ID The parameters are cell level parameters, and each cell is independently configured; n is _ID A fixed value is adopted; or, n is arranged in units of regions _ID One area is composed of a plurality of NR cells which are distributed continuously on the geographical position, and each NR cell in one area adopts n which is configured uniformly _ID 。

Optionally, the physical layer performs channel coding, modulation, layer mapping, antenna port mapping, generation of a baseband signal, and carrier modulation and up-conversion of the baseband signal on the TB on the PDSCH, including: setting PDSCH bearing SC-PTM configuration information to fixedly adopt QPSK; in the layer mapping, the PDSCH is transmitted in a single layer; in the antenna port mapping, the PDSCH is only transmitted by adopting a single antenna port; in the resource allocation, the PDSCH only adopts a downlink resource allocation type 1; and adopting a fixed MCS index table when determining the modulation order, the target code rate and the spectral efficiency of the PDSCH bearing the SC-PTM configuration information according to the MCS index.

Optionally, the performing, by the physical layer, VRB mapping and VRB-PRB mapping on the PDSCH includes: in VRB mapping, whether the PDSCH corresponding to the SC-MCCH avoids demodulation reference signals (DMRS) of other UEs is determined in the following way: the PDSCH corresponding to the SC-MCC is specified to avoid or not to avoid DMRS of other UE in the 3GPP protocol, or the PDSCH corresponding to the SC-MCCH is indicated whether to avoid DMRS of other UE in VRB mapping or not through parameters; whether interleaving mapping is adopted in mapping from VRB to PRB is indicated by a parameter.

Optionally, the processing of PDSCHDMRS on the PDSCH by the physical layer includes: generating a DMRS sequence of a PDSCH carrying the SC-PTM configuration information; and mapping the DMRS sequence to the physical resource indicated by the PDSCH resource configuration information.

Optionally, the generating the DMRS sequence of the PDSCH carrying the SC-PTM configuration information includes: initializing a pseudo-random sequence generator according to the following expression:

where l is the subscript of the symbol in the slot, n _SCID For the subscript of the scrambling ID, only one scrambling ID is used for the DMRS of the PDSCH carrying the SC-PTM configuration information, and the subscript of the scrambling ID is fixed as follows: n is _SCID ＝0，

Indicating the number of symbols included in 1 slot,

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

is a scrambling ID with subscript 0, and

is determined by any one of the following methods: specified in 3GPP protocols

Is the physical layer cell ID of the current cell; configuration in current cell

The parameters are cell level parameters, and each NR cell is configured independently; specified on 3GPP protocol

Is a fixed value; is configured by taking area as unit

With uniform allocation of NR cells within a region

Or uniformly configuring PDSCH corresponding to SC-MCCH of each cell

Each cell uses the same

Optionally, the mapping the DMRS sequence to the physical resource indicated by the PDSCH resource configuration information includes: when the DMRS is mapped to physical resources, determining the configuration type of the DMRS according to the following modes: the method comprises the steps of clearly stipulating that a DMRS of a PDSCH corresponding to an SC-MCCH adopts a fixed configuration type in a 3GPP protocol, wherein the fixed configuration type is configuration type 1 or configuration type 2, or the configuration type of the DMRS of the PDSCH corresponding to the SC-MCCH in an NR cell is indicated through parameters, or the uniform configuration type of the DMRS of the PDSCH corresponding to the SC-MCCH of a plurality of NR cells in one region, and the DMRS of the PDSCH corresponding to the SC-MCCH in each cell in the region adopt the same configuration type.

Optionally, the processing, by the physical layer, of the PT-RS of the PDSCH includes: and configuring time density and frequency density for the PDSCH corresponding to the SC-MCCH, wherein the time density and the frequency density are used for realizing the mapping of the corresponding PT-RS in a time domain and a frequency domain.

Optionally, the allocating, by the MAC entity of the MAC layer according to the protocol stack, PDSCH resources to the RLC PDU includes: and the MAC entity allocates PDSCH time to PDSCH corresponding to the SC-MCCH on the BWP for sending the SC-MCCH according to the quality QoS parameter of the service of the SC-PTM configuration information and the broadcasting method of the SC-MCCH, and allocates time-frequency resources to the PDSCH corresponding to the SC-MCCH in each allocated PDSCH time.

Optionally, the broadcast method of SC-MCCH in the NR cell includes: the SC-PTM configuration information on the SC-MCCH is repeatedly sent in a modification period, the length of the modification period is A radio frames, and the length of the repetition period is BThe method comprises the following steps that a radio frame is provided, wherein the content on the SC-MCCH can only be updated at the initial position of each modification period, the SC-MCCH is repeatedly transmitted in one modification period, the content is the same, and a base station determines the subscript SFN of the initial radio frame of each modification period according to the following formula: SFN MOD a =0, where SFN and a modulo 0, denote the subcarrier spacing SCS parameter of the selected BWP by u, with the SCS of the selected BWP being: 15*2 ^u KHz, representing the number of occasions that the SC-MCCH continuously occupies in each repetition period on the selected BWP by Duration; the starting position for transmitting the SC-MCCH in each repetition period is determined according to any one of the following modes: numbering each time slot in a modification period in sequence from 0, wherein a time slot subscript of an initial position for sending the SC-MCCH for the first time in the modification period is OffsetTimeslot, and a time slot subscript corresponding to the initial position for repeatedly sending the SC-MCCH each time in the modification period is as follows:

wherein, offsetTimeslot<B*10*2 ^u ，OffsetTimeslot+K*m-1<B*10*2 ^u Starting from a time slot with a subscript of T (b) in a modification period according to the formula, an SC-MCCH occupies continuous Duration time for sending, and the SC-MCCH bears SC-PTM configuration information; using offset radio frame to represent the offset of the initial radio frame for transmitting the SC-MCCH in each repetition period, and then the base station determines the subscript SFN1 of the initial radio frame for repeatedly transmitting the SC-MCCH each time according to the following formula: SFN1 MOD B = offsettradioframe, where in a starting radio frame SFN1 for transmitting an SC-MCCH, a subscript of a first time slot for transmitting the SC-MCCH is represented by FirstTimeslot, and the SC-MCCH occupies Duration for transmission from the time slot with the subscript of the FirstTimeslot in the radio frame SFN1, where the Duration takes a value of: k, K × 2, …, K × M, …, K × M, K is the number of beams used by the SS/PBCH Block in the NR cell, and M is the maximum number of segments used when the SC-PTM configuration information is transmitted.

Optionally, the method further includes: when the number of bits occupied by the SC-PTM configuration information exceeds a first preset value, or the quality of the current wireless channel is lower than a second preset value, the SC-PTM configuration information adopts segmented transmission, which specifically includes: when the information can be completely transmitted through one opportunity, the information occupies Duration = K continuous opportunities from the starting position of each repeated transmission, and PDSCHs corresponding to SC-MCCH are respectively transmitted in a cell through K wave beams in the Duration = K opportunities; when the information is divided into M segments, the information occupies Duration = K × M consecutive occasions from a start position of each repeated transmission, PDSCH carrying each segment is transmitted in Duration = K × M consecutive occasions, and PDSCH carrying each segment is transmitted by using K beams in time sequence from a first segment, wherein the PDSCH carrying the first segment is transmitted by using K different beams in the first K occasions, the PDSCH carrying the second segment is transmitted by using K different beams in the following K occasions, the PDSCH carrying the M segment is transmitted by using the K beam in an occasion with a subscript of K + K × (M-1), K =1,2, …, K, M are integers, the maximum value of M > 63 zxft 3763 is M, each slot has only one occasion, and the timing = K consecutive occasions correspond to K = K consecutive slots, and K = K consecutive Duration = K times corresponds to K consecutive slots.

Optionally, after determining, according to the broadcast method of the SC-MCCH, the positions of Duration occasions that need to be occupied for transmitting the PDSCH corresponding to the SC-MCCH in each repetition period in each modification period, the method further includes: based on each determined opportunity, time domain resources and frequency domain resources adopted when the PDSCH corresponding to the SC-MCCH is sent in each opportunity are determined according to the following modes: determining a PDSCH time domain resource allocation table applicable to a PDSCH corresponding to the SC-MCCH in the time domain resource allocation;

when a base station configures a PDSCH time domain resource allocation list for a PDSCH corresponding to the SC-MCCH, allocating time domain resources for the PDSCH corresponding to the SC-MCCH by adopting an allocated table; when a base station does not configure a PDSCH time domain resource allocation list for a PDSCH corresponding to an SC-MCCH, adopting a default table A adopted in PDSCH time domain resource allocation in an NR cell in a 3GPP protocol, and allocating time domain resources to the PDSCH corresponding to the SC-MCCH based on the default table A; and when the base station does not configure a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, determining a default table adopted by the PDSCH corresponding to the SC-MCCH in the PDSCH time domain resource allocation according to the SS/PBCH block and a CORESET multiplexing mode.

Optionally, the PDSCH time domain resource allocation list includes E PDSCH time domain resource allocation items, and according to the sequence configured in the list, subscripts of the E PDSCH time domain resource allocation items are respectively: 0 to E-1; and the content of each PDSCH time domain resource allocation item comprises: dmrs-typeA-Position: the symbol position of the first PDSCH DMRS when determining the PDSCH mapping type a; k0: k0: k0 is the timing difference between PDCCH and PDSCH, and K0 takes the value of 0 or 1; and PDSCH mapping type: type A or type B; start symbol and length indication RIV: a subscript for determining a first symbol occupied by the PDSCH and a number of consecutively occupied symbols; each PDSCH time domain resource allocation item corresponds to one PDSCH time domain resource allocation scene.

Optionally, the method further includes: in the time domain resource allocation, allocating time domain resources to the PDSCH by taking K occasions corresponding to each segment as a unit, and determining by adopting any one of the following modes: uniformly distributing time domain resources to the PDSCH in K occasions, wherein each occasion has the same time domain resource, and K0 and PDSCH mapping type of each occasion in the K occasions, and PDSCH initial symbol position and the total number of continuously occupied symbols in each occasion are the same; and respectively allocating time domain resources to the PDSCH in each time machine, wherein K0, PDSCH mapping type, PDSCH initial symbol position and total number of continuously occupied symbols in each time machine are usually different, when the gNB allocates a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, the time domain resource allocation needs to be based on each item in the list, and the parameter corresponding to the time domain resource allocated to the PDSCH in each time machine is necessarily identical to the time domain resource parameter indicated by a certain item in the list, when the gNB does not allocate the PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, a default table based on which the PDSCH time domain resource allocation is based is determined, and then the time domain resources are allocated to the PDSCH based on the default table.

Optionally, the method further includes: in the frequency domain resource allocation, allocating frequency domain resources to the PDSCH by taking K occasions corresponding to each segment as a unit specifically includes: when time domain resources are uniformly allocated to the PDSCH, uniformly allocating frequency domain resources to the PDSCH in K occasions or respectively allocating frequency domain resources to the PDSCH in each occasion; when time domain resources are allocated to each opportunity, frequency domain resources are allocated to the PDSCH independently in each opportunity; and after the time frequency resources are successfully allocated, transmitting the corresponding PDSCH by adopting the allocated time domain and frequency resources and the allocated beams in each allocated opportunity.

In a second aspect, an embodiment of the present invention provides a device for sending SC-PTM configuration information in an NR cell, including: a generating module, configured to generate SC-PTM configuration information for a new radio access NR cell that broadcasts a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM manner according to a protocol stack by a radio resource control RRC layer RRC entity, where the SC-PTM configuration information is a set of configuration information of each MBMS broadcast in the NR cell in an SC-PTM manner; the processing module is used for sending the SC-PTM configuration information to the next layer in the protocol stack for processing by the RRC entity, and sequentially processing the SC-PTM configuration information from the previous layer and processed by the previous layer by other layers of the protocol stack from the next layer of the protocol stack according to the sequence from top to bottom until the SC-PTM configuration information reaches a Media Access Control (MAC) layer of the protocol stack through the processing of other layers; the processing module is further configured to allocate, according to the protocol stack, physical downlink shared channel PDSCH resources and physical downlink control channel PDCCH resources to a radio link control protocol data unit RLC PDU by an MAC entity of the MAC layer, generate a medium access control protocol data unit MAC PDU from the RLC PDU, and send the MAC PDU, PDSCH scheduling information, PDSCH resource allocation information, and PDCCH resource allocation information to a physical layer of the protocol stack; the processing module is further configured to, by the physical layer, load the MAC PDU as a transport block TB through a PDSCH, process the PDSCH, and send the PDSCH through radio resources indicated by the PDSCH resource allocation information, where the PDSCH loads the SC-PTM configuration information, and the physical layer further sends a corresponding PDCCH through radio resources indicated by the PDCCH resource allocation information, and the PDCCH loads scheduling information of the PDSCH.

In a third aspect, an embodiment of the present invention provides a sending device for SC-PTM configuration information in an NR cell, including: at least one processor and memory;

the memory stores computer-executable 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 for transmitting SC-PTM configuration information in an NR cell according to any of the first aspects.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer executes instructions, and when a processor executes the computer to execute the instructions, the sending method of SC-PTM configuration information in an NR cell according to any one of the first aspects is implemented.

The embodiment of the invention provides a method and equipment for sending SC-PTM (Single Carrier-packet radio network temporary identifier) configuration information in an NR (non-random Access) cell, after the scheme is adopted, the configuration information of each MBMS can be broadcast in the NR cell, UE (user Equipment) can monitor a PDCCH (physical downlink control channel) scrambled by a G-RNTI (Group RNTI) for CRC (Cyclic redundancy check) in a corresponding search space through PDSCH (physical Downlink shared channel) radio resource configuration information in the configuration information of the corresponding MBMS, after the PDCCH scrambled by the G-RNTI for CRC is monitored, scheduling information of a PDSCH bearing the corresponding MBMS is determined according to a DCI format on the PDCCH, the corresponding PDSCH is received according to the scheduling information, the data of the corresponding MBMS is received, and the MBMS broadcast between a base station and the UE is further realized.

Drawings

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

Fig. 1 is a schematic diagram of an architecture of a NG-RAN in a 5G system according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for sending SC-PTM configuration information in an NR cell according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a protocol stack adopted by SC-PTM configuration information according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a protocol stack used by SC-PTM configuration information according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of an apparatus for transmitting SC-PTM configuration information in an NR cell according to an embodiment of the present invention;

fig. 6 is a schematic hardware configuration diagram of a sending device for SC-PTM configuration information in an NR cell according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 embodiments 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.

Fig. 1 is a schematic diagram of an architecture of an NG-RAN (Next Generation Radio Access Network) in a 5G system according to an embodiment of the present invention, where an evolution from an LTE system to the 5G system in a 3GPP protocol is divided into two stages: non-independently deployed 5G systems and independently deployed 5G systems. According to the evolution process of the core network, the non-independently deployed 5G system is divided into: 5G systems with enhanced EPC and 5G systems with 5 GC. The architecture of the NG-RAN in the 5G system is shown in fig. 1, in which a gNB is a base station of the 5G system, a cell controlled by the gNB is an NR cell, an NG-eNB is an enhanced LTE base station accessed to a 5G core network, and a 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. When the UE has an NR-NR Dual Connection (NR-utran Dual Connection) function, the UE may be simultaneously provided with services through the gnbs and the ng-eNB, and when the UE has an NR-DC Dual Connection (NR-NR Dual Connection) function, the UE may be simultaneously provided with services through the two gnbs.

The technical solution of the present invention will be described in detail below with specific 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 sending SC-PTM configuration information in an NR cell according to an embodiment of the present invention, where the method of this embodiment may be executed by a base station gNB. As shown in fig. 2, the method of this embodiment may include:

s201: for a new radio access NR cell which broadcasts a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM mode, generating SC-PTM configuration information by a radio resource control RRC layer RRC entity according to a protocol stack, wherein the SC-PTM configuration information is a set of configuration information of each MBMS broadcast in the SC-PTM mode in the NR cell.

Specifically, for an MBMS, a server providing the MBMS sends data of the MBMS to a gNB corresponding to each NR cell broadcasting the MBMS through a relevant network element or entity. In particular, the relevant network elements or entities may be 5GC (5G Core network ). In the 5G system, data for one MBMS is transmitted to the gNB in the form of PDU Session. And before broadcasting the PDU Session corresponding to the MBMS in the corresponding NR cell, the gNB broadcasts SC-PTM configuration information in the cell. The SC-PTM configuration information is a set of configuration information of each MBMS broadcast in an SC-PTM mode in the NR cell, and each UE can receive the data of the MBMS according to the configuration information of the MBMS contained in the configuration information.

In addition, the SC-PTM configuration information is generated by an RRC entity of an RRC layer in a protocol stack according to the configuration information of each MBMS broadcasted in an SC-PTM mode in the current NR cell. The configuration information of an MBMS includes at least: and the PDSCH configuration information is used for receiving the PDSCH carrying the service by the UE so as to obtain the data of the service.

The PDSCH configuration information at least comprises: TMGI (Temporary Mobile Group Identifier) of MBMS, which is used to identify one MBMS in an application layer, SESSION ID of MBMS, G-RNTI (Group RNTI, which is used to identify one MBMS in an air interface), and PDSCH resource allocation information. Each MBMS is configured with a unique logical channel SC-MTCH, which is mapped onto a separate DL-SCH, which is mapped onto a separate PDSCH. And the PDSCH resource allocation information is the resource allocation information of the PDSCH corresponding to the SC-MTCH carrying the MBMS data.

S202: and the RRC entity sends the SC-PTM configuration information to the next layer in the protocol stack for processing, and the other layers of the protocol stack sequentially process the SC-PTM configuration information from the previous layer and processed by the previous layer from the next layer of the protocol stack according to the sequence from top to bottom until the SC-PTM configuration information reaches a Media Access Control (MAC) layer of the protocol stack after being processed by the other layers.

Specifically, for transmitting the SC-PTM configuration information, the RRC layer RRC entity establishes corresponding entities in each layer above the physical layer below the RRC layer, and the entities in these layers perform processing of the layer on the SC-PTM configuration information that is processed by the corresponding entity in the previous layer and is from the corresponding entity in the previous layer. Specifically, the RRC layer RRC entity establishes a corresponding RLC entity in the RLC layer, and establishes a corresponding MAC entity in the MAC layer. The RLC entity generates RLC PDU from RLC SDU from the upper layer and transmits the RLC PDU to the MAC entity of the MAC layer through a logical channel SC-MCCH. And for the RLC entity of the RLC layer, the SC-PTM information processed by the previous layer is delivered to the RLC entity of the RLC layer in the form of RLC SDU. The RCL entity issues the RLC SDU processed by the current layer to the MAC entity of the MAC layer in the form of RLC PDU.

The RRC layer RRC entity generally performs the process of establishing corresponding entities in each layer before step S201. S203: and according to the protocol stack, the MAC entity of the MAC layer allocates PDSCH resources and PDCCH resources for an RLC PDU (radio link control protocol data unit), generates a media access control protocol data unit MAC PDU from the RLC PDU, and sends the MAC PDU, PDSCH scheduling information, PDSCH resource allocation information and PDCCH resource allocation information to a physical layer of the protocol stack. And the PDSCH resource is used for sending a PDSCH carrying the MAC PDU, the PDSCH scheduling information is generated by the PDSCH resource allocation information, and the PDCCH resource is used for sending a PDCCH carrying the PDSCH scheduling information.

Specifically, according to the protocol stack, the MAC entity of the MAC layer allocates PDSCH resources to the RLC PDU, which is a radio link control protocol data unit: and the MAC entity allocates PDSCH resources to RLC PDUs carried on the SC-MCCH on the BWP for transmitting the SC-MCCH according to the QoS (Quality of Service) parameter of the SC-PTM configuration information.

Specifically, the BWP for transmitting the SC-MCCH is determined in one of the following ways:

the first method is as follows: the gNB determines the BWP for transmitting the SC-MCCH in the current NR cell.

The second method comprises the following steps: a network element or an entity determines a BWP for sending the SC-MCCH, and each cell controlled by each gNB connected with the network element or the entity sends the SC-MCCH by adopting the BWP. For example, the core network determines the BWP transmitting the SC-MCCH. As another example, an entity is added between the core network and the gNB for determining the BWP for transmitting the SC-MCCH.

The third method comprises the following steps: the gNB CU determines the BWP for transmitting the SC-MCCH, and each cell controlled by each gNB DU connected with the gNB CU transmits the SC-MCCH by using the BWP.

Specifically, according to the protocol stack, it is not the content of the present invention that the MAC entity of the MAC layer allocates PDCCH resources to the RLC PDU, which is a RLC PDU, and is not described in detail.

After the PDSCH resources and the PDCCH resources are successfully distributed, the MAC entity generates MAC PDU by RLC PDU assembly according to the distributed PDSCH resources, and sends the MAC PDU to the physical layer through the corresponding DL-SCH. And the MAC entity generates PDSCH scheduling information according to the distributed PDSCH resources. The scheduling information is represented by a DCI format, preferably, DCI formats 1-0. The MAC entity transmits PDSCH scheduling information (DCI format 1-0), PDSCH resource allocation information, PDCCH resource allocation information to the physical layer together with the MAC PDU.

The QoS parameter of the SC-PTM configuration information may be pre-configured to the RRC layer RRC entity through an OMC (Operation and Maintenance Center) or an LMT (Local Maintenance Terminal, local Maintenance UE), and then, when the RRC entity triggers the MAC layer to establish a corresponding MAC entity through a command, the parameter is downloaded to the MAC layer as one of the configuration parameters of the MAC entity along with the related command. The QoS parameter of the SC-PTM configuration information can also be directly stored in the MAC layer as the initialization parameter of the MAC entity, and when the RRC entity triggers the MAC layer to establish the corresponding MAC entity, the established MAC entity directly enables the initialization parameter.

S204: the physical layer takes the MAC PDU as a Transport Block (TB) to bear through a PDSCH, processes the PDSCH, and sends the PDSCH through the radio resource indicated by the PDSCH resource allocation information, the PDSCH bears the SC-PTM configuration information, the physical layer also sends a corresponding PDCCH through the radio resource indicated by the PDCCH resource allocation information, and the PDCCH bears the scheduling information of the PDSCH.

A unique logical Channel SC-MCCH (Single Cell Multi-cast control Channel, single Cell multicast control Channel) is configured in an NR Cell, SC-PTM configuration information in the current Cell is carried through the SC-MCCH, the SC-MCCH is mapped to an independent DL-SCH, and the DL-SCH is mapped to an independent PDSCH. In addition, an RNTI can be allocated for SC-PTM configuration information or an SC-MCCH carrying the SC-PTM configuration information and is represented by the SC-RNTI and used for identifying the SC-PTM configuration information or the SC-MCCH at an air interface. Preferably, a fixed value is allocated to the SC-RNTI in the 3GPP protocol, that is, all NR cells collectively indicate SC-PTM configuration information or SC-MCCH in a cell with the fixed value of SC-RNTI.

And the physical layer broadcasts the PDCCH scrambled by the SC-RNTI through the allocated PDCCH resources, and the DCI format on the PDCCH is PDSCH scheduling information. Preferably, the PDSCH scheduling information is represented on the PDCCH in DCI formats 1 to 0. The physical layer regards the MAC PDU as one TB, and the PDSCH is carried by the PDSCH and broadcasted in the NR cell through the allocated PDSCH resources.

After the scheme is adopted, the configuration information of each MBMS can be broadcast in the NR cell, the UE can monitor the PDCCH scrambled by G-RNTI (Group RNTI) for CRC in a corresponding search space through the PDSCH configuration information in the configuration information of the corresponding MBMS, after the PDCCH scrambled by the G-RNTI for CRC is monitored, the scheduling information of the PDSCH carrying the corresponding MBMS is determined according to the DCI format on the PDCCH, the corresponding PDSCH is received according to the scheduling information, the data reception of the corresponding MBMS is realized, and the MBMS broadcast between the base station and the UE is further realized. And the G-RNTI is the G-RNTI in PDSCH configuration information in the MBMS configuration information.

Based on the method of fig. 2, the present specification also provides some specific embodiments of the method, which are described below.

As shown in fig. 3, a schematic structural diagram of a protocol stack used for SC-PTM configuration information provided in the embodiment of the present invention, and as shown in fig. 4, a schematic structural diagram of a protocol stack used for SC-PTM configuration information provided in another embodiment of the present invention, the SC-PTM configuration information may use any one of the control plane protocol stacks shown in the two diagrams. Preferably, the protocol stack shown in fig. 3 may be employed.

In a specific embodiment, a base station uses a structure of a protocol stack as shown in fig. 3 in an NR cell that broadcasts MBMS in an SC-PTM manner, where the RRC entity sends the SC-PTM configuration information to a next layer in the protocol stack for processing, and sequentially performs processing of the current layer on the SC-PTM configuration information from a previous layer and processed by the previous layer from the next layer of the protocol stack according to an order from top to bottom, where the processing of the current layer may include:

and respectively establishing a packet data convergence protocol PDCP entity, an RLC entity and an MAC entity according to the protocol stack. And taking the SC-PTM configuration information as data on a special Signaling Radio Bearer (SRB) and transmitting the data to the PDCP entity for processing by the RRC entity in an RRC layer to generate the PDCP PDU. And the PDCP entity transmits the generated PDCP PDU to the RLC entity through an RLC channel. The RLC entity processes the PDCP PDU on the RLC Channel, generates an RLC PDU, and sends the RLC PDU to an MAC entity of a Cell through a Single Cell Multi-cast control Channel (SC-MCCH).

Specifically, for transmitting SC-PTM configuration information, a PDCP entity and an RLC entity are respectively established. The SC-PTM configuration information is generated by the RRC entity in the RRC layer as data on a specific SRB and transmitted to the corresponding PDCP entity. After the PDCP entity processes the generated PDCP PDU is transmitted to the RLC entity through the RLC channel. The RLC entity processes the PDCP PDU on the RLC channel to generate the RLC PDU, and sends the RLC PDU to the MAC entity through a corresponding logic channel SC-MCCH. Preferably, the RLC channel may adopt an UM mode RLC channel.

In a specific embodiment, a base station uses a structure of a protocol stack as shown in fig. 4 in an NR cell that broadcasts an MBMS in an SC-PTM manner, and sequentially sends SC-PTM configuration information of a current cell, generated by an RRC layer RRC entity in the protocol stack, to other layers in the protocol stack for processing, which may include:

and according to the protocol stack, the RRC layer RRC entity establishes an RLC entity and an MAC entity. And transmitting the SC-PTM configuration information to the RLC entity through an RLC channel by the RRC entity in the RRC layer. And the RLC entity generates RLC PDU from the SC-PTM configuration information and sends the RLC PDU to the MAC entity through a logical channel SC-MCCH.

Specifically, the protocol stack has no PDCP layer, and SC-PTM configuration information is directly transmitted to the RLC entity through the RLC channel by the RRC entity in the RRC layer. And the RLC entity generates RLC PDU through the SC-PTM configuration information and transmits the RLC PDU to the MAC entity through a logical channel SC-MCCH. Preferably, the RLC channel transmission may adopt an UM mode RLC channel.

In fig. 3 and 4, the MAC entity and the physical layer are processed as described in the related steps in the embodiment shown in fig. 2.

In a specific embodiment, the physical layer carries the MAC PDU as a TB through a PDSCH, and processes the PDSCH, which may include: processing for TB on PDSCH, processing for PDSCHDMRS (Demodulation Reference Signal), and processing for PDSCHPT-RS (Phase-tracking Reference Signal).

The processing of PDSCH carrying SC-PTM configuration information and PDSCH carrying common service in the invention includes: the processing of TB on PDSCH, the processing of PDSCH DMRS and the processing of PDSCH PT-RS are carried out, and the processing of TB on PDSCH/the processing of PDSCH DMRS/the processing of PDSCH PT-RS have the same processing steps, but the processing procedures adopted by the processing steps are different and/or the adopted parameters are different. In the following embodiments, the present invention will focus on the differences in the processing of TB, the processing of PDSCH DMRS, and the processing of PDSCH PT-RS on PDSCH compared with PDSCH carrying ordinary traffic, which are the innovative points of the present solution and are also the adaptation processing that must be adopted to carry SC-PTM configuration information through PDSCH.

In one embodiment, the processing of TBs on PDSCH by the physical layer includes: when TB corresponds to SC-PTM configuration information on PDSCH, the following steps need to perform special processing related to SC-PTM configuration information, which specifically includes:

in bit scrambling, an initialization value c of a scrambling sequence generator is generated as follows _init In time, the relevant parameters need to adopt values or configuration modes which are proprietary to the invention:

c _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID ，

in the above formula, q is a subscript of a codeword TB carried on the PDSCH, and for the PDSCH carrying SC-PTM configuration information, only one codeword can be carried on the PDSCH, where the subscript of the codeword is q =0,n _RNTI A receiving side for identifying PDSCH, n is when the PDSCH carries SC-PTM configuration information _RNTI = SC-RNTI is used for indicating that the logical channel corresponding to the current PDSCH is SC-MCCH or the carried information is SC-PTM configuration information, n _ID E {0,1,. 1023} is the PDSCH scrambling ID.

Specifically, when the PDSCH carries SC-PTM configuration information, n in the above formula _ID Is determined in one of the following ways:

the first method is as follows:

is the physical layer cell ID of the current cell.

The second method comprises the following steps: allocating n to PDSCH corresponding to SC-MCCH in cell _ID The parameters are cell-level parameters, and each cell is configured independently.

The third method comprises the following steps: n is a radical of an alkyl radical _ID Using a fixed value, preferably n _ID ＝0。

The method four comprises the following steps: n is arranged by area _ID . One area consists of several NR cells distributed geographically consecutively. N uniformly configured for each NR cell in one area _ID 。

The fifth mode is as follows: uniformly allocating n to PDSCH corresponding to SC-MCCH of each cell _ID Each cell using the same n _ID 。

In addition, the PDSCH carrying SC-PTM configuration information fixedly adopts QPSK. Specifically, since the SC-PTM configuration information is broadcast in the cell as the system message, the modulation scheme of the information is fixedly set to QPSK.

In addition, in the layer mapping, the PDSCH is transmitted with a single layer.

In addition, in the antenna port mapping, the PDSCH is transmitted using only a single antenna port. Specifically, the PDSCH may be transmitted using the antenna port 1000.

In addition, in the resource allocation, the PDSCH employs only downlink resource allocation type 1.

In addition, a fixed MCS subscript table is adopted when the modulation order, the target code rate and the spectral efficiency of the PDSCH bearing the SC-PTM configuration information are determined according to the MCS subscript. Preferably, the MCS index table is set up specifically for transmission of the SC-PTM configuration information by emulation. One table may also be selected among the MCS index tables already existing in the current 3gpp ts38.214 protocol. Preferably, as with the system message, the SC-PTM configuration information uses the MCS index table 1 in the current 3gpp ts38.214 protocol, i.e. 3gpp ts38.214 table5.1.3.1-1.

In addition, in the VRB mapping, whether the PDSCH corresponding to the SC-MCCH avoids demodulation reference signals DMRSs of other UEs is determined as follows:

and the PDSCH corresponding to the SC-MCCH is specified to avoid or not avoid DMRS of other UEs in the 3GPP protocol, or whether the PDSCH corresponding to the SC-MCCH avoids the DMRS of other UEs in VRB mapping is indicated through parameters.

Specifically, in VRB mapping, whether the PDSCH corresponding to SC-MCCH avoids DMRSs (demodulation reference signals) of other UEs may be determined as follows:

the method I comprises the following steps: in the 3GPP protocol, there are specified: the PDSCH corresponding to SC-MCC avoids or need not avoid DMRSs of other UEs. In this way, whether the PDSCH corresponding to the SC-MCCH avoids DMRS of other UEs does not need to be indicated through the parameters. And the PDSCH corresponding to the SC-MCCH in each NR cell avoids or does not avoid REs occupied by DMRS of other UEs.

The second method comprises the following steps: and indicating whether the PDSCH corresponding to the SC-MCCH avoids DMRS of other UEs in VRB mapping or not through the parameter.

The configuration granularity of the parameters is as follows: at the cell level, each cell configures the parameters independently. The configuration granularity of the parameter may also be: and at the area level, each area bearing the current MBMS is independently configured with the parameter, and the values of the parameter in each cell in one area are the same.

In addition, in mapping VRBs to PRBs, whether or not interleaving mapping is used is indicated by a parameter. If no relevant parameters are configured, the default is as follows: no interleaving mapping is used. The configuration granularity of the parameters is as follows: at the cell level, each cell configures the parameters independently. The configuration granularity of the parameter can also be as follows: and at the area level, each area bearing the current MBMS is independently configured with the parameter, and the values of the parameter in each cell in one area are the same. In one NR cell, if the PDSCH corresponding to SC-MCCH is mapped to a PRB from a VRB in an interleaving manner, the Bundle Size is a fixed value, and preferably, PRB Bundle Size =2.

In one embodiment, the processing of PDSCHDMRS on PDSCH by the physical layer comprises: and generating a DMRS sequence of the PDSCH carrying the SC-PTM configuration information, and mapping the DMRS sequence to the physical resource indicated by the PDSCH resource allocation information.

Specifically, the process for generating the DMRS of the PDSCH carrying the SC-PTM configuration information and the process for generating the DMRS of the PDSCH carrying the common service include: generation of PDSCH DMRS sequences and mapping of DMRS sequences to physical resources. Since the PDSCH carrying the SC-PTM configuration information is broadcast to all UEs in the cell, in order to enable all UEs to decode the PDSCH, special processing needs to be performed in the DMRS generation process of the PDSCH.

In a specific embodiment, the generating a DMRS sequence of a PDSCH carrying the SC-PTM configuration information may include:

in the DMRS sequence generation of the PDSCH, when the pseudo-random sequence generator is initialized according to the following expression, the relevant parameters need to adopt values or configuration modes specific to the present invention:

in the above formula, l is the subscript of the symbol in the time slot, n _SCID For the subscript of the scrambling ID, only one scrambling ID is used for the DMRS of the PDSCH carrying the SC-PTM configuration information, and the subscript of the scrambling ID is fixed as: n is _SCID ＝0，

Indicating 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.

Specifically, in the above formula

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

the first method is as follows: provision in 3GPP protocols

Is the physical layer cell ID of the current cell.

The second method comprises the following steps: configuration in current cell

The parameters are cell level parameters, each NR cell is configured independently.

The third method comprises the following steps: specified on 3GPP protocol

Is a fixed value. Preferably, the following are specified in the 3GPP protocol:

the method is as follows: is configured by taking area as unit

With uniform allocation of NR cells within a region

The definition of the region is as above and will not be described in detail.

The fifth mode is as follows: PDSCH (physical Downlink shared channel) unified configuration corresponding to SC-MCCH (single-channel control channel) for each cell

Each cell uses the same

In a specific embodiment, the mapping the DMRS sequence to the physical resource indicated by the PDSCH resource allocation information may include:

when the DMRS sequences are mapped to physical resources, determining the configuration type of the DMRS according to the following mode:

a fixed configuration type is adopted for a DMRS of a PDSCH corresponding to an SC-MCCH specified in a 3GPP protocol, and the fixed configuration type is as follows: configuring type 1 or type 2, or indicating the configuration type of DMRS in each NR cell through parameters, or uniformly configuring 'configuration type' for the DMRS of PDSCHs corresponding to SC-MCCHs of a plurality of NR cells included in a region, wherein the DMRS of the PDSCHs corresponding to the SC-MCCHs in each cell in the region adopt the same configuration type, or uniformly configuring 'configuration type' for the DMRS of the PDSCHs corresponding to the SC-MCCHs of each cell, and the DMRS of the PDSCHs corresponding to the SC-MCCHs in all the NR cells adopt the same 'configuration type', namely, the DMRS of the PDSCHs corresponding to the SC-MCCHs in each cell have the same time-frequency pattern in a resource grid.

Specifically, when the DMRS sequences of the PDSCH are mapped to physical resources, the DMRS sequences have different time-frequency patterns in the resource grid under different configuration types. Specifically, there are two configuration types of DMRS sequences: configuration type 1 and configuration type 2.

Determining the configuration type of the DMRS of the PDSCH corresponding to the SC-MCCH according to one of the following modes:

the first method is as follows: there is explicit provision in the 3GPP protocol for: and the DMRS sequence of the PDSCH corresponding to the SC-MCCH fixedly adopts a configuration type 1 or a configuration type 2.

The second method comprises the following steps: and indicating the configuration type of the DMRS sequence of the PDSCH corresponding to the SC-MCCH through the parameter. The parameters are cell level parameters, each NR cell is configured independently.

The third method comprises the following steps: the 'configuration type' is configured by taking the region as a unit, and the DMRS sequences of the PDSCH corresponding to the SC-MCCH in each NR cell in one region adopt the same 'configuration type', namely the DMRS sequences of the PDSCH corresponding to the SC-MCCH in the cells have the same time-frequency pattern in a resource grid.

The method is as follows: and uniformly configuring a configuration type for the DMRS of the PDSCH corresponding to the SC-MCCH of each cell, wherein all NR cells adopt the same configuration type, namely the DMRS in each cell has the same time-frequency pattern in a resource grid.

In a specific embodiment, the processing of PT-RS of the PDSCH by the physical layer includes:

and configuring time density and frequency density for the PDSCH corresponding to the SC-MCCH, wherein the time density and the frequency density are used for realizing the mapping of the corresponding PT-RS in a time domain and a frequency domain.

Specifically, for simplicity, it may be explicitly specified in the 3GPP protocol that the PDSCH corresponding to the SC-MCCH is not configured with PT-RS.

In addition, in order to improve the receiving quality of the SC-MCCH, a PT-RS can be allocated to the PDSCH corresponding to the SC-MCCH for the UE to track the phase change of the received PDSCH. And when the PDSCH corresponding to the SC-MCCH is allowed to be configured with the PT-RS, configuring time density and frequency density for the PDSCH corresponding to the SC-MCCH for mapping the corresponding PT-RS in a time domain and a frequency domain. Preferably, the PT-RS of the PDSCH corresponding to the SC-MCCH adopts a fixed time density and a fixed frequency density in the time domain mapping and the frequency domain mapping, respectively. For example: time density LPT-RS =1, frequency density KPT-RS =2.

In a specific embodiment, the allocating, by the MAC entity of the MAC layer according to the protocol stack, PDSCH resources to a radio link control protocol data unit, RLC PDU includes:

and the MAC entity allocates PDSCH time to PDSCH corresponding to the SC-MCCH on the BWP for sending the SC-MCCH according to the quality QoS parameter of the service of the SC-PTM configuration information and the broadcasting method of the SC-MCCH, and allocates time-frequency resources to the PDSCH corresponding to the SC-MCCH in each allocated PDSCH time.

The broadcast method of SC-MCCH in NR cell in the invention is as follows:

and the SC-PTM configuration information on the SC-MCCH is repeatedly sent in a modification period, the length of the modification period is A wireless frames, and the length of the repetition period is B wireless frames. The content on the SC-MCCH can only start to be updated at the initial position of each modification period, and the SC-MCCH is repeatedly transmitted in one modification period, and the content is the same. The base station determines the subscript SFN of the initial radio frame of each modification period according to the following formula:

SFN MOD a =0, where the modulus of SFN and a is 0.

The SCS (sub-carrier Spacing) parameter of the selected BWP is denoted by u, namely: the SCS of the selected BWP is: 15*2 ^u KHz. The Duration indicates the number of occasions that the SC-MCCH continues to occupy in each repetition period on the selected BWP.

The starting position for transmitting the SC-MCCH in each repetition period is determined according to one of the following modes:

the method I comprises the following steps: numbering each time slot in a modification period in sequence from 0, wherein a time slot subscript of an initial position for sending the SC-MCCH for the first time in the modification period is OffsetTimeslot, and a time slot subscript corresponding to the initial position for repeatedly sending the SC-MCCH each time in the modification period is as follows:

in the above formula, offsetTimeslot<B*10*2 ^u ，OffsetTimeslot+K*m-1<B*10*2 ^u 。

And starting from a time slot with a subscript of T (b) in a modification period according to the formula, the SC-MCCH occupies continuous Duration time for transmission, and the SC-MCCH bears SC-PTM configuration information.

The second method comprises the following steps: using offset radio frame to represent the offset of the initial radio frame for transmitting the SC-MCCH in each repetition period, and then the base station determines the subscript SFN1 of the initial radio frame for repeatedly transmitting the SC-MCCH each time according to the following formula:

SFN1 MOD B＝OffsetRadioframe

in a starting wireless frame SFN1 for sending the SC-MCCH, the subscript of the first time slot for sending the SC-MCCH is represented by FirstTimeslot, and the SC-MCCH starts to occupy Duration for sending time in the wireless frame SFN1 from the time slot with the subscript of the FirstTimeslot.

The values of the Duration are as follows: k, K × 2, …, K × M, …, K × M, K is the number of beams used by SS/PBCH Block in the NR cell. M is the maximum segment number adopted by the SC-PTM configuration information during transmission. The number of bits occupied by the SC-PTM configuration information on the SC-MCCH increases as the MBMS transmitted by the cell in the SC-PTM manner increases. Therefore, when the number of bits occupied by the SC-PTM configuration information is large or the quality of the current radio channel is poor, the SC-PTM configuration information may be transmitted in segments, which includes the following specific procedures:

when the information can be completely transmitted through one opportunity, the information occupies Duration = K consecutive opportunities from a starting position of each repeated transmission, and PDSCH corresponding to SC-MCCH is transmitted in a cell through K beams in the Duration = K opportunities, respectively. The K wave beams are K wave beams adopted by an SS/PBCH block in the current NR cell.

When the information is divided into m segments, the information occupies Duration = K × m continuous occasions from a start position of each repeated transmission, the PDSCH carrying each segment is transmitted in Duration = K × m continuous occasions, and the PDSCH carrying each segment is transmitted by using K beams in time sequence from a first segment, that is: respectively adopting K different wave beams to send and bear the PDSCH of a first subsection in the first K occasions, and respectively adopting K different wave beams to send and bear the PDSCH of a second subsection in the following K occasions; and the analogy is that: and transmitting the PDSCH carrying the M-th segment by using a K-th beam at a timing with a subscript of K + K (M-1), wherein K =1,2, …, K and M are integers, and the maximum value of M >0,m is M. The K wave beams are K wave beams adopted by the SS/PBCH block in the current NR cell.

Preferably, a beam sequence adopted by the SS/PBCH block during transmission is determined, and K beams are respectively adopted to transmit the PDSCH corresponding to the SC-MCCH in corresponding K occasions according to the sequence.

Typically, there is only one time per slot, with the aforementioned dosing = K consecutive times corresponding to Duration = K consecutive slots, and the aforementioned Duration = K × m consecutive times corresponding to Duration = K × m consecutive slots.

In summary, the positions of Duration occasions that need to be occupied for transmitting the PDSCH corresponding to the SC-MCCH in each repetition period in each modification period are determined according to the broadcast method of the SC-MCCH. Based on each determined opportunity, the time domain resource and the frequency domain resource adopted when the PDSCH corresponding to the SC-MCCH is sent in each opportunity can be determined according to the following modes:

firstly, the invention provides a PDSCH time domain resource allocation table and a PDSCH time domain resource allocation list which are applicable to a PDSCH corresponding to an SC-MCCH in PDSCH time domain resource allocation. In the time domain resource allocation of the PDSCH carrying the common service, there are four PDSCH time domain resource allocation tables configured by default: PDSCH time domain resource allocation table under NCP (normal CP) A, ECP (extended CP) A, PDSCH time domain resource allocation table B and PDSCH time domain resource allocation table C using NCP. The above table is defined in 3GPP TS38.214, chapter 5, section 5.1.2.1. Also explicitly defined in this section in table 5.1.2.1.1-1: and under different parameter value combinations, an applicable PDSCH time domain resource allocation table or an applicable PDSCH time domain resource allocation list. However, the table does not define a PDSCH time domain resource allocation table or an applicable PDSCH time domain resource allocation list for PDSCH carrying SC-PTM configuration information in PDSCH time domain resource allocation. In order to solve the problem, the present application provides a PDSCH time domain resource allocation table or a PDSCH time domain resource allocation list applicable to a PDSCH corresponding to an SC-MCCH, as shown in table 1.

TABLE 1 PDSCH TIME-DIMENSIONAL RESOURCE ALLOCATION TABLE AND TABLE APPLIED FOR PDSCH CORRESPONDING TO SC-MCCH

In the above table, the fourth column is used to indicate whether the SC-MCCH is configured with the "PDSCH time domain resource allocation list". The values of the column "present" and "absent" respectively indicate that a "PDSCH time domain resource allocation list" is configured and a "PDSCH time domain resource allocation list" is not configured. When the SC-MCCH is not configured with a PDSCH time domain resource allocation list, a default table A is adopted no matter whether PDCCH is mapped to CORESET 0 or other CORESETs, and no matter what value is the multiplexing mode of SS/PBCH Block and CORESET in a cell. Specifically, the table a under NCP or the table a under ECP is determined according to the CP type corresponding to the PDSCH. When NCP/ECP is adopted for PDSCH, the table A below is adopted correspondingly.

In order to increase flexibility, when a PDSCH corresponding to SC-MCCH is not configured with a "PDSCH time domain resource allocation list", the present invention proposes that different default tables may also be adopted according to the multiplexing mode of SS/PBCH Block and CORESET. Specifically, as shown in table 2.

Table 2: time domain resource allocation table suitable for PDSCH corresponding to SC-MCCH

In table 2, the fourth meaning is the same as that in table 1, and specifically, table a under NCP or table a under ECP is determined according to the CP type corresponding to the PDSCH. When NCP/ECP is adopted for PDSCH, the table A below is adopted correspondingly.

When the gNB configures a PDSCH time domain resource allocation list for the SC-MCCH, the list is preferentially adopted to allocate PDSCH time domain resources in PDSCH time domain resource allocation. The composition of the "PDSCH time domain resource allocation list" described in the present invention is explained below.

The PDSCH time domain resource allocation list includes E PDSCH time domain resource allocation items, and 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:

dmrs-TypeA-Position: for determining PDSCH mapping type a, the symbol position of the first PDSCH DMRS.

K0: k0 is a timing difference between the PDCCH and the PDSCH, and preferably, K0 is 0 or 1. Other integer values greater than 1 are also contemplated.

PDSCH mapping type: type a or type B.

Start symbol and length indication RIV: the index of the first symbol used to determine the PDSCH occupancy and the number of consecutive occupied symbols.

Typically the maximum value of E is 16. Of course, the value of E may also be increased to refine or expand the scenario of the corresponding PDSCH time domain resource allocation. And each PDSCH time domain resource allocation item corresponds to one PDSCH time domain resource allocation scene.

Then, the invention provides a time-frequency resource allocation method of PDSCH corresponding to SC-MCCH.

In the time domain resource allocation, time domain resources are allocated to the PDSCH in units of K occasions corresponding to each segment. Specifically, any one of the following methods may be adopted:

the first method is as follows: and uniformly allocating time domain resources to the PDSCH in K occasions, wherein each occasion has the same time domain resources. Namely: k0 of each opportunity in the K opportunities, a PDSCH mapping type, a PDSCH starting symbol position in each opportunity and the total number of continuously occupied symbols are the same.

The second method comprises the following steps: the time domain resources are allocated to the PDSCH within each time machine separately. In this way, K0, PDSCH mapping type, PDSCH starting symbol position and total number of consecutively occupied symbols within each timer are typically different. However, the time domain resources allocated to the PDSCH in each occasion have the same K0.

When the gNB configures a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, the time domain resource allocation needs to be based on each item in the list, namely; the parameters corresponding to the time domain resources allocated to the PDSCH in each of the aforementioned occasions must be completely the same as the time domain resource parameters indicated by a certain item in the list.

When the gNB does not configure a time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, determining a default table based on which the PDSCH time domain resource allocation is based according to the table 1 or the table 2, and then allocating time domain resources to the PDSCH based on the default table, namely; the parameters corresponding to the time domain resources allocated to the PDSCH in each of the aforementioned occasions are completely the same as the time domain resource parameters indicated by a certain item in the corresponding default table. For example, according to table 1, when a corresponding list is not allocated to the PDSCH corresponding to the SC-MCCH, a time domain resource is allocated to the PDSCH according to the default table a, and a parameter corresponding to the time domain resource allocated to the PDSCH is completely the same as a parameter indicated by one of the items in the default table a.

In the frequency domain resource allocation, frequency domain resources are allocated to the PDSCH in units of K occasions corresponding to each segment. The method comprises the following specific steps:

when the time domain resources are uniformly allocated to the PDSCH, the frequency domain resources may be uniformly allocated to the PDSCH in K occasions. Of course, frequency domain resources may also be allocated to the PDSCH separately in each timeslot.

When the time domain resources are allocated to each occasion, the frequency domain resources are allocated to the PDSCH separately in each occasion.

After the time-frequency resources are successfully allocated, the corresponding PDSCH may be transmitted using the allocated time-frequency resources and the allocated beams in each allocated occasion.

Further, the meanings of acronyms referred to in this scheme can be referred to in the summary in table 3.

TABLE 3 English sense comparison table

Based on the same idea, an embodiment of this specification further provides a device corresponding to the foregoing method, and fig. 5 is a schematic structural diagram of a sending device for SC-PTM configuration information in an NR cell according to an embodiment of the present invention, as shown in fig. 5, the sending device may include:

a generating module 501, configured to generate SC-PTM configuration information by a radio resource control RRC layer RRC entity according to a protocol stack for a new radio access NR cell that broadcasts a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM manner, where the SC-PTM configuration information is a set of configuration information of each MBMS broadcast in the NR cell in an SC-PTM manner.

In the processing module 502, the rrc entity sends the SC-PTM configuration information to the next layer in the protocol stack for processing, and performs processing of the current layer on the SC-PTM configuration information from the previous layer and processed by the previous layer in sequence from the next layer of the protocol stack according to the sequence from top to bottom until the SC-PTM configuration information reaches the MAC layer of the protocol stack after being processed by the other layers.

The processing module 502 is further configured to allocate, according to the protocol stack, a PDSCH resource of a physical downlink shared channel and a PDCCH resource of a physical downlink control channel for an RLC PDU of a radio link control protocol data unit, generate an MAC PDU of a MAC protocol data unit from the RLC PDU, and send the MAC PDU, PDSCH scheduling information, PDSCH resource allocation information, and PDCCH resource allocation information to a physical layer of the protocol stack, where the PDSCH resource is used to send a PDSCH carrying the MAC PDU, the PDSCH scheduling information is generated from the PDSCH resource allocation information, and the PDCCH resource is used to send a PDCCH carrying the PDSCH scheduling information.

The processing module 502 is further configured to, by the physical layer, load the MAC PDU as a transport block TB through a PDSCH, process the PDSCH, and send the PDSCH through radio resources indicated by the PDSCH resource allocation information, where the PDSCH loads the SC-PTM configuration information, and the physical layer further sends a corresponding PDCCH through radio resources indicated by the PDCCH resource allocation information, and the PDCCH loads scheduling information of the PDSCH.

In a specific embodiment, the processing module 502 is further configured to: and respectively establishing a packet data convergence protocol PDCP entity, an RLC entity and an MAC entity according to the protocol stack.

And taking the SC-PTM configuration information as data on a special Signaling Radio Bearer (SRB) (signaling Radio Bearer) and transmitting the data to the PDCP entity by the RRC entity in an RRC layer for processing to generate the PDCP PDU.

And the PDCP entity transmits the generated PDCP PDU to the RLC entity through an RLC channel.

And the RLC entity processes the PDCP PDU on the RLC channel to generate the RLC PDU and sends the RLC PDU to the MAC entity of the cell through a single-cell multicast control channel SC-MCCH.

In a specific embodiment, the processing module 502 is further configured to: and according to the protocol stack, the RRC layer RRC entity establishes an RLC entity and an MAC entity.

And transmitting the SC-PTM configuration information to the RLC entity through an RLC channel by the RRC entity in the RRC layer.

And the RLC entity generates an RLC PDU from the SC-PTM configuration information and sends the RLC PDU to the MAC entity through the SC-MCCH.

In a specific embodiment, the processing module 502 is further configured to, in the "processing PDSCH": the method comprises the steps of processing TB on a PDSCH, processing a demodulation reference signal PDSCHDMRS of a physical downlink shared channel and processing a phase tracking reference signal PDSCHPT-RS of the physical downlink shared channel.

In a specific embodiment, the processing module 502 is further configured to: the physical layer performs channel coding, bit scrambling, modulation, layer mapping, antenna port mapping, VRB to PRB mapping, baseband signal generation, and carrier modulation and up-conversion of baseband signals on TBs on PDSCHs.

In a specific embodiment, the processing module 502 is further configured to:

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

c _init ＝n _RNTI ·2 ¹⁵ +q·2 ¹⁴ +n _ID (ii) a Wherein q isSubscript of TB carried on PDSCH, for PDSCH carrying SC-PTM configuration information, the PDSCH can only carry one code word, and subscript of the code word is q =0,n _RNTI A receiving side for identifying PDSCH, n is when the PDSCH carries SC-PTM configuration information _RNTI = SC-RNTI is used for indicating that the logical channel corresponding to the current PDSCH is SC-MCCH or the carried information is SC-PTM configuration information, n _ID E {0,1.., 1023} is the PDSCH scrambling ID, and n _ID Is determined by any one of the following methods:

is the physical layer cell ID of the current cell; allocating n to PDSCH corresponding to SC-MCCH in cell _ID The parameters are cell-level parameters, and each cell is configured independently; n is _ID A fixed value is adopted; or, n is arranged in units of regions _ID One area is composed of a plurality of NR cells which are continuously distributed on geographical positions, and each NR cell in one area adopts n which is uniformly configured _ID (ii) a Uniformly allocating n to PDSCH corresponding to SC-MCCH of each cell _ID Each cell using the same n _ID 。

In a specific embodiment, the processing module 502 is further configured to: setting PDSCH bearing SC-PTM configuration information to fixedly adopt QPSK; in the layer mapping, the PDSCH is transmitted in a single layer; in the antenna port mapping, the PDSCH is only transmitted by adopting a single antenna port; in the resource allocation, the PDSCH only adopts a downlink resource allocation type 1; and adopting a fixed MCS index table when determining the modulation order, the target code rate and the spectral efficiency of the PDSCH bearing the SC-PTM configuration information according to the MCS index.

In a specific embodiment, the processing module 502 is further configured to: in VRB mapping, whether the PDSCH corresponding to the SC-MCCH avoids demodulation reference signals (DMRS) of other UEs is determined in the following way: the PDSCH corresponding to the SC-MCC is specified to avoid or not to avoid DMRS of other UE in the 3GPP protocol, or the PDSCH corresponding to the SC-MCCH is indicated whether to avoid DMRS of other UE in VRB mapping or not through parameters; whether interleaving mapping is adopted or not is indicated by a parameter in mapping from VRB to PRB.

In a specific embodiment, the processing module 502 is further configured to: generating a DMRS sequence of a PDSCH carrying the SC-PTM configuration information; and mapping the DMRS sequence to the physical resource indicated by the PDSCH resource configuration information.

In a specific embodiment, the processing module 502 is further configured to: initializing a pseudo-random sequence generator according to the following expression:

where l is the subscript of the symbol in the slot, n _SCID For the subscript of the scrambling ID, only one scrambling ID is used for the DMRS of the PDSCH carrying the SC-PTM configuration information, and the subscript of the scrambling ID is fixed as: n is _SCID ＝0，

Indicating the number of symbols included in 1 slot,

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

is a scrambling ID with subscript 0, and

is determined in any one of the following ways:

specified in 3GPP protocols

Is the physical layer cell ID of the current cell.

Configuration in current cell

Specified on 3GPP protocol

Is a fixed value.

Is configured by taking area as unit

With uniform allocation of NR cells within a region

Or, uniformly configuring PDSCH corresponding to SC-MCCH for each cell

Each cell uses the same

In a specific embodiment, the processing module 502 is further configured to: when the DMRS is mapped to physical resources, determining the configuration type of the DMRS according to the following modes:

the method comprises the steps of clearly stipulating that a DMRS of a PDSCH corresponding to an SC-MCCH adopts a fixed configuration type in a 3GPP protocol, wherein the fixed configuration type is configuration type 1 or configuration type 2, or the configuration type of the DMRS of the PDSCH corresponding to the SC-MCCH in an NR cell is indicated through parameters, or the uniform configuration type of the DMRS of the PDSCH corresponding to the SC-MCCH of a plurality of NR cells in one region, and the DMRS of the PDSCH corresponding to the SC-MCCH in each cell in the region adopt the same configuration type.

In a specific embodiment, the processing module 502 is further configured to:

In a specific embodiment, the processing module 502 is further configured to: the SC-PTM configuration information on the SC-MCCH is repeatedly sent in a modification period, the length of the modification period is A wireless frames, the length of the repetition period is B wireless frames, wherein the content on the SC-MCCH can only be updated at the initial position of each modification period, the SC-MCCH is repeatedly sent in one modification period, the content is the same, and the base station determines the subscript SFN of the initial wireless frame of each modification period according to the following formula: SFN MOD a =0, where SFN and a modulo 0, denote the subcarrier spacing SCS parameter of the selected BWP by u, with the SCS of the selected BWP being: 15*2 ^u KHz, duration, indicates the number of occasions that the SC-MCCH continuously occupies per repetition period on the selected BWP.

The starting position for transmitting the SC-MCCH in each repetition period is determined according to any one of the following modes:

numbering each time slot in a modification period in sequence from 0, wherein the time slot subscript of the initial position for sending the SC-MCCH for the first time in the modification period is offsetTimesslot, and the time slot subscript corresponding to the initial position for repeatedly sending the SC-MCCH for each time in the modification period is as follows:

wherein, offsetTimesslot<B*10*2 ^u ，OffsetTimeslot+K*m-1<B*10*2 ^u And starting from a time slot with a subscript of T (b) in a modification period according to the formula, the SC-MCCH occupies continuous Duration time to transmit, and the SC-MCCH bears SC-PTM configuration information.

Using offset radio frame to represent the offset of the initial radio frame for transmitting the SC-MCCH in each repetition period, and then the base station determines the subscript SFN1 of the initial radio frame for repeatedly transmitting the SC-MCCH each time according to the following formula: SFN1 MOD B = offsettradioframe, where in a starting radio frame SFN1 for transmitting an SC-MCCH, a subscript of a first time slot for transmitting the SC-MCCH is represented by FirstTimeslot, and then the SC-MCCH occupies Duration for transmission from the time slot with the subscript of the FirstTimeslot in the radio frame SFN1, and a value of Duration is: k, K × 2, …, K × M, …, K × M, K is the number of beams used by the SS/PBCH Block in the NR cell, and M is the maximum number of segments used when the SC-PTM configuration information is transmitted.

In a specific embodiment, the processing module 502 is further configured to: when the number of bits occupied by the SC-PTM configuration information exceeds a first preset value, or when the current quality of the radio channel is lower than a second preset value, the SC-PTM configuration information is transmitted in segments, which specifically includes: when the information can be completely transmitted through one opportunity, the information occupies Duration = K consecutive opportunities from a starting position of each repeated transmission, and PDSCH corresponding to SC-MCCH is transmitted in a cell through K beams in the Duration = K opportunities, respectively.

When the information is divided into M segments, the information occupies Duration = K × M consecutive occasions from a start position of each repeated transmission, PDSCH carrying each segment is transmitted in Duration = K × M consecutive occasions, and PDSCH carrying each segment is transmitted by using K beams in time sequence from a first segment, wherein the PDSCH carrying the first segment is transmitted by using K different beams in the first K occasions, the PDSCH carrying the second segment is transmitted by using K different beams in the following K occasions, the PDSCH carrying the M segment is transmitted by using the K beam in an occasion with a subscript of K + K × (M-1), K =1,2, …, K, M are integers, the maximum value of M > 63 zxft 3763 is M, each slot has only one occasion, and the timing = K consecutive occasions correspond to K = K consecutive slots, and K = K consecutive Duration = K times corresponds to K consecutive slots.

In a specific embodiment, the processing module 502 is further configured to: based on each determined opportunity, time domain resources and frequency domain resources adopted when the PDSCH corresponding to the SC-MCCH is sent in each opportunity are determined according to the following modes: and determining a PDSCH time domain resource allocation table which is applicable to the PDSCH corresponding to the SC-MCCH in the time domain resource allocation. And when the base station configures a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, allocating time domain resources for the PDSCH corresponding to the SC-MCCH by adopting the allocated list. And when the base station does not configure a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, adopting a default table A adopted in PDSCH time domain resource allocation in an NR cell in a 3GPP protocol, and allocating time domain resources to the PDSCH corresponding to the SC-MCCH based on the default table A. And when the base station does not configure a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, determining a default table adopted by the PDSCH corresponding to the SC-MCCH in the PDSCH time domain resource allocation according to the SS/PBCH block and a CORESET multiplexing mode.

In a specific embodiment, the processing module 502 is further configured to: when the gNB does not configure the PDSCH time domain resource allocation list for the SC-MCCH, adopting different default tables according to the multiplexing mode of SS/PBCH Block and CORESET, wherein the PDSCH time domain resource allocation list comprises E PDSCH time domain resource allocation items, and the subscripts of the E PDSCH time domain resource allocation items are respectively as follows according to the sequence configured in the list: 0 to E-1; and the content of each PDSCH time domain resource allocation entry includes:

K0: k0 is the timing difference between PDCCH and PDSCH, and K0 takes the value 0 or 1.

And PDSCH mapping type: type a or type B.

Each PDSCH time domain resource allocation item corresponds to one PDSCH time domain resource allocation scene.

In a specific embodiment, the processing module 502 is further configured to:

in the time domain resource allocation, allocating time domain resources to the PDSCH by taking K occasions corresponding to each segment as a unit, and determining by adopting any one of the following modes: uniformly distributing time domain resources to the PDSCH in K occasions, wherein each occasion has the same time domain resource, and K0 and PDSCH mapping type of each occasion in the K occasions, and PDSCH initial symbol position and the total number of continuously occupied symbols in each occasion are the same; and respectively allocating time domain resources to the PDSCH in each time machine, wherein K0, PDSCH mapping type, PDSCH initial symbol position and total number of continuously occupied symbols in each time machine are usually different, when the gNB allocates a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, the time domain resource allocation needs to be based on each item in the list, and the parameter corresponding to the time domain resource allocated to the PDSCH in each time machine is necessarily identical to the time domain resource parameter indicated by a certain item in the list, when the gNB does not allocate the PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, a default table based on which the PDSCH time domain resource allocation is based is determined, and then the time domain resources are allocated to the PDSCH based on the default table.

In a specific embodiment, the processing module 502 is further configured to: in the frequency domain resource allocation, allocating frequency domain resources to the PDSCH in units of K opportunities corresponding to each segment specifically includes: when time domain resources are uniformly allocated to the PDSCH, frequency domain resources are uniformly allocated to the PDSCH in K occasions or are respectively allocated to the PDSCH in each occasion. When the time domain resources are allocated to each occasion, the frequency domain resources are allocated to the PDSCH separately in each occasion. And after the time frequency resources are successfully allocated, transmitting the corresponding PDSCH by adopting the allocated time domain and frequency resources and the allocated beams in each allocated opportunity.

The apparatus provided in the embodiment of the present invention may implement the method in the embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 6 is a schematic hardware configuration diagram of a sending device for SC-PTM configuration information in an NR cell according to an embodiment of the present invention. As shown in fig. 6, the present embodiment provides an apparatus 600 including: at least one processor 601 and memory 602. The processor 601 and the memory 602 are connected by a bus 603.

In a specific implementation, at least one processor 601 executes computer-executable instructions stored by the memory 602 to cause the at least one processor 601 to perform the methods of the above-described method embodiments.

For a specific implementation process of the processor 601, reference may be made to the above method embodiments, which implement the principle and the technical effect similarly, and details of this embodiment are not described herein again.

In the embodiment shown in fig. 6, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.

The memory may comprise high speed RAM memory and may also include non-volatile storage NVM, such as at least one disk memory.

The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the sending method of SC-PTM configuration information in an NR cell according to the foregoing method embodiment is implemented.

The computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.

An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled 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 invention.

Claims

1. A method for transmitting SC-PTM configuration information in an NR cell, comprising:

for a new radio access NR cell which broadcasts a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM mode, generating SC-PTM configuration information by a radio resource control RRC layer RRC entity according to a protocol stack, wherein the SC-PTM configuration information is a set of configuration information of each MBMS broadcast in the NR cell in the SC-PTM mode;

the RRC entity sends the SC-PTM configuration information to the next layer in the protocol stack for processing, and the other layers of the protocol stack sequentially carry out the processing of the current layer on the SC-PTM configuration information from the previous layer and processed by the previous layer from the next layer of the protocol stack according to the sequence from top to bottom until the SC-PTM configuration information reaches a Media Access Control (MAC) layer of the protocol stack after being processed by the other layers;

according to the protocol stack, an MAC entity of an MAC layer allocates Physical Downlink Shared Channel (PDSCH) resources and Physical Downlink Control Channel (PDCCH) resources for a radio link control protocol data unit (RLC PDU), the RLC PDU generates a media access control protocol data unit (MAC PDU), and the MAC PDU, PDSCH scheduling information, PDSCH resource allocation information and PDCCH resource allocation information are sent to a physical layer of the protocol stack, wherein the PDSCH resources are used for sending a PDSCH bearing the MAC PDU, the PDSCH scheduling information is generated by the PDSCH resource allocation information, and the PDCCH resources are used for sending a PDCCH bearing the PDSCH scheduling information;

the physical layer takes the MAC PDU as a transmission block TB and carries the MAC PDU through a PDSCH, processes the PDSCH, and sends the PDSCH through the wireless resources indicated by the PDSCH resource allocation information, the PDSCH carries the SC-PTM configuration information, the physical layer also sends a corresponding PDCCH through the wireless resources indicated by the PDCCH resource allocation information, and the PDCCH carries the scheduling information of the PDSCH;

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

the method comprises the steps of processing TB on a PDSCH, processing a demodulation reference signal PDSCHDMRS of a physical downlink shared channel and processing a phase tracking reference signal PDSCHPT-RS of the physical downlink shared channel.

2. The method according to claim 1, wherein the RRC entity sends the SC-PTM configuration information to a next layer in the protocol stack for processing, and sequentially performs the processing of the SC-PTM configuration information from a previous layer and processed by the previous layer from the next layer of the protocol stack according to an order from top to bottom for the other layers of the protocol stack, including:

establishing a packet data convergence protocol PDCP entity, an RLC entity and an MAC entity according to the protocol stack respectively;

taking the SC-PTM configuration information as data on a special Signaling Radio Bearer (SRB) (signaling Radio Bearer), and transmitting the data to the PDCP entity by the RRC entity in an RRC layer for processing to generate a PDCP PDU;

the PDCP entity transmits the generated PDCP PDU to the RLC entity through an RLC channel;

3. The method according to claim 1, wherein the RRC entity sends the SC-PTM configuration information to a next layer in the protocol stack for processing, and sequentially performs the processing of the SC-PTM configuration information from a previous layer and processed by the previous layer from the next layer of the protocol stack according to an order from top to bottom for the other layers of the protocol stack, including:

according to the protocol stack, an RRC layer RRC entity establishes an RLC entity and an MAC entity;

transmitting the SC-PTM configuration information to the RLC entity by the RRC entity in the RRC layer through an RLC channel;

and the RLC entity generates RLC PDU from the SC-PTM configuration information and sends the RLC PDU to the MAC entity through the SC-MCCH.

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

the physical layer performs channel coding, bit scrambling, modulation, layer mapping, antenna port mapping, VRB to PRB mapping, generation of baseband signals, and carrier modulation and up-conversion of the baseband signals for the TBs on the PDSCH.

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

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 SC-PTM configuration information, 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 carries SC-PTM configuration information _RNTI = SC-RNTI is used for indicating that the logical channel corresponding to the current PDSCH is SC-MCCH or the carried information is SC-PTM configuration information, n _ID E {0,1.., 1023} is the PDSCH scrambling ID, and n _ID Is determined in any one of the following ways:

is the physical layer cell ID of the current cell;

allocating n to PDSCH corresponding to SC-MCCH in cell _ID The parameters are cell level parameters, and each cell is independently configured;

n _ID a fixed value is adopted;

or, n is arranged in units of areas _ID One area is composed of a plurality of NR cells which are distributed continuously on the geographical position, and each NR cell in one area adopts n which is configured uniformly _ID 。

6. The method of claim 4, wherein the physical layer performs channel coding, modulation, layer mapping, antenna port mapping, generation of baseband signals, and carrier modulation and up-conversion of the baseband signals for the TBs on the PDSCH, and comprises:

PDSCH for bearing SC-PTM configuration information is fixedly QPSK;

in the layer mapping, the PDSCH is transmitted in a single layer;

in the antenna port mapping, the PDSCH is only transmitted by adopting a single antenna port;

in the resource allocation, the PDSCH only adopts a downlink resource allocation type 1;

and adopting a fixed MCS index table when determining the modulation order, the target code rate and the spectral efficiency of the PDSCH bearing the SC-PTM configuration information according to the MCS index.

7. The method of claim 4, wherein the physical layer VRB maps PDSCH, VRB to PRB mapping, comprising:

in VRB mapping, whether the PDSCH corresponding to the SC-MCCH avoids demodulation reference signals (DMRS) of other UEs is determined in the following way:

the PDSCH corresponding to the SC-MCCH is specified in a 3GPP protocol to avoid DMRS of other UE or not, or the PDSCH corresponding to the SC-MCCH is indicated by parameters to avoid DMRS of other UE in VRB mapping;

whether interleaving mapping is adopted or not is indicated by a parameter in mapping from VRB to PRB.

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

generating a DMRS sequence of a PDSCH carrying the SC-PTM configuration information;

and mapping the DMRS sequences to physical resources indicated by the PDSCH resource configuration information.

9. The method of claim 8, wherein the generating the DMRS sequence of the PDSCH carrying the SC-PTM configuration information comprises:

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

Indicating the number of symbols included in 1 slot,

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

is a scrambling ID with subscript 0, and

is determined in any one of the following ways:

specified in 3GPP protocols

Is the physical layer cell ID of the current cell;

configuration in current cell

The parameters are cell level parameters, and each NR cell is configured independently;

specified on 3GPP protocol

Is a fixed value;

is prepared by taking area as unitDevice for placing

With uniform allocation of NR cells within a region

PDSCH unified configuration corresponding to SC-MCCH for each cell

Each cell uses the same

10. The method of claim 8, wherein the mapping the DMRS sequence to the physical resource indicated by the PDSCH resource configuration information comprises:

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

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

12. The method of claim 1, wherein the allocating, by the MAC entity of the MAC layer according to the protocol stack, PDSCH resources for radio link control protocol data units, RLC PDUs comprises:

13. The method of claim 12, wherein the method for broadcasting the SC-MCCH in the NR cell comprises:

the SC-PTM configuration information on the SC-MCCH is repeatedly sent in a modification period, the length of the modification period is A wireless frames, the length of the repetition period is B wireless frames, wherein the content on the SC-MCCH can only be updated at the initial position of each modification period, the SC-MCCH is repeatedly sent in one modification period, the content is the same, and the base station determines the subscript SFN of the initial wireless frame of each modification period according to the following formula: SFN MOD a =0, where SFN and a modulo 0, denote the subcarrier spacing SCS parameter of the selected BWP by u, with the SCS of the selected BWP being: 15*2 ^u KHz, using Duration to represent the number of continuous occupied occasions for transmitting SC-MCCH in each repetition period on the selected BWP;

numbering each time slot in a modification period in sequence from 0, wherein the time slot subscript of the initial position for sending the SC-MCCH for the first time in the modification period is offsetTimesslot, and the time slot subscript corresponding to the initial position for repeatedly sending the SC-MCCH for each time in the modification period is as follows: t (B) = OffsetTimeslot + B10 x 2 ^u ，

Wherein, offsetTimeslot<B*10*2 ^u ，OffsetTimeslot+K*m-1<B*10*2 ^u SC-MCCH occupancy starting from a time slot with index T (b) within a modification period according to the above formulaSending at continuous Duration time, and carrying SC-PTM configuration information on SC-MCCH;

using offset radio frame to represent the offset of the initial radio frame for transmitting the SC-MCCH in each repetition period, and then the base station determines the subscript SFN1 of the initial radio frame for repeatedly transmitting the SC-MCCH each time according to the following formula:

SFN1 MOD B = offsettradioframe, where in a starting radio frame SFN1 for transmitting an SC-MCCH, a subscript of a first time slot for transmitting the SC-MCCH is represented by FirstTimeslot, and then the SC-MCCH occupies Duration for transmission from the time slot with the subscript of the FirstTimeslot in the radio frame SFN1, and a value of Duration is: k, K × 2, …, K × M, …, K × M, K is the number of beams used by the SS/PBCH Block in the NR cell, and M is the maximum number of segments used when the SC-PTM configuration information is transmitted.

14. The method of claim 13, further comprising:

when the number of bits occupied by the SC-PTM configuration information exceeds a first preset value, or when the current quality of the radio channel is lower than a second preset value, the SC-PTM configuration information is transmitted in segments, which specifically includes:

when the information can be completely transmitted through one opportunity, the information occupies Duration = K consecutive opportunities from the starting position of each repeated transmission, and PDSCH corresponding to SC-MCCH is transmitted in a cell through K beams respectively in the Duration = K opportunities;

when the information is divided into M segments, the information occupies Duration = K M continuous occasions from the starting position of each repeated transmission, PDSCHs carrying each segment are transmitted in the Duration = K M continuous occasions, and the PDSCHs carrying each segment are transmitted by using K beams respectively according to the time sequence from the first segment, wherein the PDSCHs carrying the first segment are transmitted by using K different beams respectively at the first K occasions, the PDSCHs carrying the second segment are transmitted by using K different beams respectively at the following K occasions, the PDSCH carrying the M segment is transmitted by using the K beam at the occasion with the index of K + K (M-1), K =1,2, …, K, M are integers, the maximum value of M >0,m is M,

there is only one opportunity per slot, with contribution = K consecutive opportunities corresponding to Duration = K consecutive slots, and Duration = K m consecutive opportunities corresponding to Duration = K m consecutive slots.

15. The method of claim 14, wherein after determining, according to the broadcast method of the SC-MCCH, the Duration occasions that need to be occupied for transmitting the PDSCH corresponding to the SC-MCCH in each repetition period in each modification period, the method further comprises:

based on each determined opportunity, time domain resources and frequency domain resources adopted when the PDSCH corresponding to the SC-MCCH is sent in each opportunity are determined according to the following modes:

determining a PDSCH time domain resource allocation table applicable to a PDSCH corresponding to the SC-MCCH in the time domain resource allocation;

when a base station configures a PDSCH time domain resource allocation list for a PDSCH corresponding to the SC-MCCH, allocating time domain resources to the PDSCH corresponding to the SC-MCCH by adopting an allocated table; when a base station does not configure a PDSCH time domain resource allocation list for a PDSCH corresponding to an SC-MCCH, adopting a default table A adopted in PDSCH time domain resource allocation in an NR cell in a 3GPP protocol, and allocating time domain resources to the PDSCH corresponding to the SC-MCCH based on the default table A; and when the base station does not configure a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, determining a default table adopted by the PDSCH corresponding to the SC-MCCH in PDSCH time domain resource allocation according to the SS/PBCH block and the CORESET multiplexing mode.

16. The method of claim 15, wherein the PDSCH time domain resource allocation list comprises E PDSCH time domain resource allocation entries, and the subscripts of the E PDSCH time domain resource allocation entries are, in the order configured in the list, respectively: 0 to E-1; and the content of each PDSCH time domain resource allocation item comprises:

dmrs-typeA-Position: the symbol position of the first PDSCH DMRS when determining the PDSCH mapping type a;

k0: k0 is the timing difference between PDCCH and PDSCH, and K0 takes the value of 0 or 1;

and PDSCH mapping type: type A or type B;

start symbol and length indication RIV: a subscript for determining a first symbol occupied by the PDSCH and a number of consecutively occupied symbols;

17. The method of claim 16, further comprising:

in the time domain resource allocation, allocating time domain resources to the PDSCH by taking K occasions corresponding to each segment as a unit, and determining by adopting any one of the following modes:

uniformly distributing time domain resources to the PDSCH in K occasions, wherein each occasion has the same time domain resource, and K0 and PDSCH mapping type of each occasion in the K occasions, and PDSCH initial symbol position and the total number of continuously occupied symbols in each occasion are the same;

respectively allocating time domain resources to the PDSCH in each timer, wherein K0, PDSCH mapping type, PDSCH initial symbol position and total number of continuously occupied symbols in each timer are usually different;

when the gNB configures a PDSCH time domain resource allocation list for the PDSCH corresponding to the SC-MCCH, the time domain resource allocation needs to be based on each item in the list, and the parameter corresponding to the time domain resource allocated to the PDSCH in each occasion is necessarily identical to the time domain resource parameter indicated by a certain item in the list.

18. The method of claim 17, further comprising:

in the frequency domain resource allocation, allocating frequency domain resources to the PDSCH in units of K opportunities corresponding to each segment specifically includes:

when time domain resources are uniformly allocated to the PDSCH, uniformly allocating frequency domain resources to the PDSCH in K occasions or respectively allocating frequency domain resources to the PDSCH in each occasion;

when time domain resources are allocated to each opportunity, frequency domain resources are allocated to the PDSCH independently in each opportunity;

and after the time frequency resources are successfully allocated, transmitting the corresponding PDSCH by adopting the allocated time domain and frequency resources and the allocated beams in each allocated opportunity.

19. A transmission apparatus of SC-PTM configuration information in an NR cell, comprising:

a generating module, configured to generate SC-PTM configuration information for a new radio access NR cell that broadcasts a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM manner according to a protocol stack by a radio resource control RRC layer RRC entity, where the SC-PTM configuration information is a set of configuration information of each MBMS broadcast in the NR cell in an SC-PTM manner;

the processing module is used for sending the SC-PTM configuration information to the next layer in the protocol stack for processing by the RRC entity, and sequentially processing the SC-PTM configuration information from the previous layer and processed by the previous layer by other layers of the protocol stack from the next layer of the protocol stack according to the sequence from top to bottom until the SC-PTM configuration information reaches a Media Access Control (MAC) layer of the protocol stack through the processing of other layers;

the processing module is further configured to allocate, according to the protocol stack and the MAC entity of the MAC layer, a PDSCH resource and a PDCCH resource of a physical downlink shared channel to a RLC PDU, generate a MAC PDU from the RLC PDU, and send the MAC PDU, PDSCH scheduling information, PDSCH resource allocation information, and PDCCH resource allocation information to the physical layer of the protocol stack, where the PDSCH resource is used to send a PDSCH carrying the MAC PDU, the PDSCH scheduling information is generated from the PDSCH resource allocation information, and the PDCCH resource is used to send a PDCCH carrying the PDSCH scheduling information;

the processing module is further configured to use the MAC PDU as a transport block TB by the PDSCH to process the PDSCH, and send the PDSCH through the radio resource indicated by the PDSCH resource allocation information, where the PDSCH carries the SC-PTM configuration information, and use the physical layer to send a corresponding PDCCH through the radio resource indicated by the PDCCH resource allocation information, where the PDCCH carries scheduling information of the PDSCH;

the processing module is further configured to process a TB on the PDSCH, process a demodulation reference signal PDSCHDMRS of the physical downlink shared channel, and process a phase tracking reference signal PDSCHPT-RS of the physical downlink shared channel when the PDSCH is processed.

20. A transmitting device of SC-PTM configuration information in an NR cell, comprising: at least one processor and memory;

the memory stores computer-executable 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 transmitting SC-PTM configuration information in an NR cell according to any of claims 1 to 18.

21. A computer-readable storage medium having stored thereon computer-executable instructions which, when executed by a processor, implement the method of transmitting SC-PTM configuration information in an NR cell according to any of claims 1 to 18.