CN113498023B - MBMS receiving and sending method, device, equipment and storage medium - Google Patents

MBMS receiving and sending method, device, equipment and storage medium Download PDF

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CN113498023B
CN113498023B CN202010256290.1A CN202010256290A CN113498023B CN 113498023 B CN113498023 B CN 113498023B CN 202010256290 A CN202010256290 A CN 202010256290A CN 113498023 B CN113498023 B CN 113498023B
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pdsch
mbms
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CN113498023A (en
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魏立梅
袁乃华
范晨
陈迎
朱玉梅
周志宏
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Chengdu TD Tech Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The application provides a method, a device, equipment and a storage medium for transmitting and receiving an MBMS. In the method, a base station allocates semi-static resources for the MBMS which is transmitted periodically and has fixed data volume in each period to transmit PDSCH for bearing the MBMS, and determines configuration information of the semi-static resources allocated to the MBMS. And the base station broadcasts the configuration information of the semi-static resources of the MBMS and periodically sends a PDSCH for bearing the MBMS by adopting the allocated semi-static resources. And the user equipment receives the semi-static resource configuration information of the MBMS sent by the base station and periodically receives the PDSCH according to the semi-static resource configuration information. The scheme avoids the need of adopting a plurality of beams to send the PDCCH at a plurality of occasions when the MBMS is transmitted in a dynamic scheduling mode, and greatly reduces the consumption of PDCCH resources.

Description

MBMS receiving and sending method, device, equipment and storage medium
Technical Field
The present application relates to the field of communications technologies, and in particular, to an MBMS transceiving method, apparatus, device, and storage medium.
Background
The fifth generation mobile communication system (denoted by 5G system) has come into the lives of people with the advantages of higher system throughput, lower transmission delay, higher reliability and more connected users.
In a 5G system, when a Multimedia Broadcast Multicast Service (MBMS) is Broadcast in a single-cell point-to-multipoint SC-PTM manner in a New Radio access (NR) cell, a Physical Downlink Shared Channel (PDSCH) carrying MBMS data is transmitted in a dynamic scheduling manner. For each PDSCH transmission, only one transport block, TB, is carried on the PDSCH. In order to enable each PDSCH transmission to cover the whole cell, K PDSCH occasions need to be allocated to each PDSCH transmission, and K beams are respectively adopted to transmit the PDSCH in the K occasions, wherein the K beams are adopted when a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) Block is transmitted in an NR cell, and the K beams cover the whole cell. Meanwhile, K PDCCH occasions are also required to be allocated to a Physical Downlink Control Channel (PDCCH) carrying PDSCH scheduling information in each PDSCH occasion. Each PDSCH occasion corresponds to one PDCCH occasion. The DCI format of the downlink control information on the PDCCH transmitted in one PDCCH occasion is scheduling information of a PDSCH in the corresponding PDSCH occasion, and the beam used when the PDCCH is transmitted in one PDCCH occasion is a beam used when the PDSCH is transmitted in the corresponding PDSCH occasion, that is: the PDSCH and the PDCCH carrying its scheduling information are transmitted in the same direction using the same beam when transmitted. The method for transmitting the PDSCH carrying MBMS data in a dynamic scheduling manner consumes a large amount of PDCCH resources. At present, no solution to this problem is available.
Disclosure of Invention
The application provides an MBMS receiving and sending method, device, equipment and storage medium, which can realize sending MBMS in a semi-static scheduling mode, greatly reduce the consumption of PDCCH resources and improve the utilization rate of resources in an NR cell.
In a first aspect, an embodiment of the present application provides an MBMS transceiving method, where the method is applied To an NR Cell that broadcasts a multimedia broadcast multicast service MBMS in a Single Cell Point To multipoint (SC-PTM) manner, and the method includes:
the base station broadcasts the semi-static resource configuration information of the MBMS in the NR cell, and periodically sends a Physical Downlink Shared Channel (PDSCH) for bearing the MBMS through the semi-static resource allocated to the MBMS;
the user equipment receives the semi-static resource configuration information sent by the base station;
the user equipment determines the period of the base station sending the MBMS, the position of each PDSCH occasion of the MBMS sent by the base station in each period and the time-frequency resource allocated to the PDSCH by the base station in each occasion according to the semi-static resource configuration information;
and the user equipment receives the corresponding PDSCH in each PDSCH timer in each period from the latest period according to the time-frequency resource allocated to the PDSCH.
In a second aspect, an embodiment of the present application provides a base station, including:
a broadcast module, configured to broadcast semi-static resource allocation information of an MBMS in an NR cell;
and the sending module is used for periodically sending the PDSCH carrying the MBMS through the semi-static resources allocated to the MBMS.
In a third aspect, an embodiment of the present application provides a user equipment, including:
the receiving module is used for receiving the semi-static resource configuration information sent by the base station;
a processing module, configured to determine, according to the semi-static resource configuration information, a period in which the base station sends an MBMS, a position of each PDSCH occasion in which the base station sends the MBMS, and a time-frequency resource occupied by the PDSCH in each occasion;
the receiving module is further configured to receive, in each PDSCH timer in each cycle from a latest cycle, a corresponding PDSCH according to the time-frequency resources allocated to the PDSCH.
In a fourth aspect, an embodiment of the present application provides a base station, including: a memory and a processor;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored in the memory, so that the processor executes the MBMS transceiving method on the base station side according to the first aspect.
In a fifth aspect, an embodiment of the present application provides a user equipment, including: a memory and a processor;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored in the memory, so that the processor executes the MBMS transceiving method on the user equipment side according to the first aspect.
In a sixth aspect, an embodiment of the present application provides a storage medium, including: a readable storage medium and a computer program for implementing the MBMS transceiving method of the first aspect.
In the MBMS transceiving method, apparatus, device, and storage medium provided in the embodiments of the present application, a base station allocates semi-static resources for an MBMS that is periodically transmitted and has a fixed data volume in each period, transmits a PDSCH that carries the MBMS, and determines configuration information of the semi-static resources allocated to the MBMS. And the base station broadcasts the configuration information of the semi-static resources of the MBMS and periodically sends the PDSCH bearing the MBMS by adopting the allocated semi-static resources. And the user equipment receives the semi-static resource configuration information of the MBMS sent by the base station and periodically receives the PDSCH according to the semi-static resource configuration information. The scheme avoids the need of adopting a plurality of beams to send the PDCCH at a plurality of occasions when the MBMS is transmitted in a dynamic scheduling mode, and greatly reduces the consumption of PDCCH resources.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, 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 next generation radio access network NG-RAN in a 5G system according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a method for transmitting an MBMS in an NR cell in a semi-persistent scheduling manner according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a method for processing MBMS data burst in semi-persistent scheduling according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present application;
fig. 6 is a block diagram of a user equipment according to an embodiment of the present application;
fig. 7 is a block diagram of a base station according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
Fig. 1 is a schematic diagram of an architecture of a NG-RAN in a next generation radio access network in a 5G system. In the figure, the gbb is a base station of a 5G system, a cell controlled by the gbb is an NR cell, the ng-eNB is an LTE-enhanced base station accessing 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 5G core network 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.
Currently, in the 5G system, SC-PTM is used to broadcast MBMS in an NR cell. In this way, a Group-Radio Network temporary Identity (G-RNTI) is allocated to each MBMS for identifying the MBMS at an air interface of the NR Cell, and a Single Cell Multi-Channel (SC-MTCH) is allocated to each MBMS for carrying data of the MBMS. The SC-MTCH is mapped to an independent Downlink Shared Channel (DL-SCH), and the DL-SCH is mapped to an independent PDSCH. And when one MBMS is broadcasted in the NR cell, PDSCH opportunity and time-frequency resources are allocated to the PDSCH bearing the MBMS in a dynamic scheduling mode. Specifically, for PDSCH carrying MBMS, only one TB is carried on PDSCH every PDSCH transmission. For each PDSCH transmission, K PDSCH occasions need to be allocated to the PDSCH, and time-frequency resources are allocated to the PDSCH in each PDSCH occasion. And respectively adopting K wave beams to send PDSCH in the K PDSCH occasions, and adopting the allocated time-frequency resources to send PDSCH in each PDSCH occasion. Meanwhile, for each PDSCH transmission, K PDCCH occasions are also required to be allocated to the PDCCH carrying the MBMS scheduling information, each PDSCH occasion corresponds to one PDCCH occasion, and CCE resources are allocated to the PDCCH in each PDCCH occasion. And transmitting the PDCCH scrambled by the G-RNTI for the cyclic redundancy check CRC at each PDCCH occasion by adopting the allocated CCE resources, wherein the DCI format of the downlink control information on the PDCCH is the scheduling information of the PDSCH in the corresponding PDSCH occasion. And respectively adopting K wave beams to transmit the PDCCH scrambled by the G-RNTI for the CRC in K PDCCH timers. The beam adopted when the corresponding PDCCH is transmitted in one PDCCH time machine is the beam adopted when the PDSCH is transmitted in the corresponding PDSCH time machine, so that the PDSCH and the PDCCH carrying the scheduling information of the PDSCH are transmitted in the same direction. The K beams are used when the SS/PBCH block is sent in a cell.
The method for broadcasting the MBMS in the NR cell in the SC-PTM mode allocates resources to the PDSCH bearing the MBMS in a dynamic scheduling mode in each PDSCH transmission, and the PDCCH resources are greatly consumed when PDSCH scheduling information is transmitted. Therefore, for the MBMS which is periodically transmitted and has a relatively fixed data volume in each period, the present application provides a method for transmitting the corresponding MBMS in a semi-persistent scheduling manner, so as to greatly reduce the consumption of PDCCH resources. For example, voice traffic generally transmits voice blocks in a period of 20ms, and each voice block is generally a fixed 244 bits in length, and for each voice traffic, the corresponding voice traffic may be transmitted in a semi-persistent scheduling manner, so as to greatly reduce consumption of PDCCH resources.
Fig. 2 is a flowchart illustrating a method for transmitting an MBMS in an NR cell in a semi-persistent scheduling manner according to an embodiment of the present application, where as shown in fig. 2, the method includes:
s100: for one MBMS, when the base station determines that the service is periodically transmitted and the data volume in each period is relatively fixed, the base station allocates semi-static resources for the service for periodically transmitting PDSCH bearing the service, and generates semi-static resource configuration information of the service according to the allocated semi-static resources. And the base station broadcasts the semi-static resource configuration information of the MBMS in the cell and periodically sends the PDSCH carrying the MBMS data through the semi-static resource allocated to the MBMS.
Specifically, the base station broadcasts the semi-static resource configuration information of the MBMS through a corresponding SC-MCCH. The SC-MCCH is used for carrying SC-PTM configuration information of a bandwidth slice (BWP) in which the MBMS is positioned. The SC-PTM configuration information of one BWP is a set of configuration information of each MBMS broadcasted on the BWP in an SC-PTM mode. Preferably, the SC-MCCH carrying SC-PTM configuration information for one BWP is transmitted on the BWP. For the MBMS transmitted in a semi-static scheduling manner, the configuration information of the MBMS is semi-static resource configuration information of the MBMS.
The UE may periodically receive the PDSCH carrying the service according to the semi-static resource configuration information of the MBMS.
Specifically, the base station may set a condition for transmitting the MBMS in a semi-persistent scheduling manner. And when one MBMS meets the condition, transmitting the MBMS by adopting a semi-static scheduling mode. Such as: and when the QCI of one MBMS is set to be 1 by the base station, the service is transmitted by adopting a semi-static scheduling mode. The service with QCI of 1 is a voice service.
For the MBMS meeting the condition, the base station allocates semi-static resources for the service for periodically sending the PDSCH bearing the service, and generates semi-static resource configuration information of the service according to the allocated semi-static resources.
The UE in the NR cell can determine the period for sending the service, the position of each PDSCH opportunity for sending the service in each period and the time-frequency resource occupied by the PDSCH for bearing the service in each opportunity according to the semi-static resource configuration information of one MBMS. Preferably, the PDSCH occupies the same time-frequency resources in each time interval in which the traffic is transmitted.
Specifically, the semi-static resource configuration information of an MBMS transmitted in a semi-static scheduling manner includes the following contents:
(1) temporary mobile group identity, TMGI, and Session identity, Session ID, of MBMS: the TMGI is used to distinguish different MBMS in the application layer and the Session ID is used to distinguish different sessions of the same MBMS in the application layer.
(2) G-RNT and Semi-Persistent Scheduling-group-radio network temporary identity (Semi-Persistent Scheduling G-RNTI, SPS-G-RNTI) for MBMS: the G-RNTI is used for distinguishing each MBMS transmitted in a dynamic scheduling mode, and the SPS-G-RNTI is used for distinguishing each MBMS transmitted in a semi-static scheduling mode.
(3) Configuration information of BWP transmitting MBMS: BWP subscript, BWP start position, BWP occupied resource block RB number and BWP subcarrier spacing (SCS) parameters, etc. The UE determines a BWP to transmit the MBMS according to the information, and receives the MBMS on the corresponding BWP.
(4) The configuration information of the search space corresponding to the PDCCH carrying the CRC of the MBMS dynamic scheduling information scrambled by the G-RNTI: and the UE determines the search space where the PDCCH bearing the MBMS dynamic scheduling information is positioned according to the information so as to monitor the dynamic scheduling information of the corresponding MBMS in the corresponding search space. Preferably, the search space is located on the BWP transmitting the MBMS. The configuration information of the search space corresponding to the PDCCH scrambled by the G-RNTI for CRC includes: configuration information for mapping a set of control resources of the search space and configuration information for the search space.
(5) The configuration information of the search space corresponding to the PDCCH carrying the CRC of the MBMS semi-persistent scheduling information scrambled by the SPS-G-RNTI: and the UE determines the search space where the PDCCH bearing the MBMS semi-static scheduling information is positioned according to the information so as to monitor the semi-static scheduling information of the corresponding MBMS in the corresponding search space. Preferably, the search space is located on the BWP transmitting the MBMS.
Preferably, for any MBMS, the PDCCH carrying the CRC of the MBMS dynamic scheduling information scrambled by the G-RNTI and the PDCCH carrying the CRC of the MBMS semi-persistent scheduling information scrambled by the SPS-G-RNTI have the same search space, and the search space is positioned on the BWP transmitting the MBMS.
If specified in the 3GPP protocol: for any MBMS, when the PDCCH carrying the CRC of the MBMS dynamic scheduling information and scrambled by the SPS-G-RNTI and the PDCCH carrying the CRC of the MBMS semi-static scheduling information and scrambled by the G-RNTI have the same search space, the parameter does not need to be configured.
(6) PDSCH occasion configuration information: period T, offset, and the number of occupied occasions Duration. The UE determines the period for transmitting the PDSCH by using the information, and transmits the position of each PDSCH occasion for transmitting the PDSCH in each period.
(7) PDSCH time domain resource allocation information: PDSCH mapping type within PDSCH occasion, timing difference K0 between PDCCH carrying PDSCH scheduling information and the corresponding PDSCH, start symbol and length indication RIV. And the UE determines the time domain resources for transmitting the PDSCH in the corresponding time according to the information.
(8) PDSCH frequency domain resource allocation information: starting RB position for sending PDSCH in PDSCH opportunity, RB number occupied by PDSCH and SCS parameter u of PDSCH PDSCH And the like. And the UE determines the frequency domain resources for transmitting the PDSCH in the corresponding time according to the information.
In the above (6), the parameter Duration is used to indicate the number of occasions allocated to PDSCH carrying MBMS in each period.
The number of beams employed when transmitting the SS/PBCH block in the current cell is denoted by K. For PDSCH carrying MBMS, when the PDSCH does not adopt repeated transmission to improve service receiving performance, allocating K opportunities to PDSCH transmission each time, respectively adopting K wave beams to transmit the PDSCH in the K opportunities, and carrying the same TB on the PDSCH in the K opportunities. The PDSCH is transmitted by using K beams in K occasions respectively so as to enable the PDSCH to be transmitted to cover the whole cell.
When the PDSCH is repeatedly transmitted and the number of times of the repeated transmission is V, the PDSCH is allocated with Duration ═ K × V occasions for each PDSCH transmission. And numbering K times V time intervals from 0 according to a time sequence, dividing the K times V time intervals into V groups, wherein each group consists of K adjacent time intervals, the K time intervals included in each group respectively adopt K wave beams to transmit PDSCH, and the PDSCH bears the same TB in the K times V time intervals. And when the PDSCH is transmitted in each group of the time machines, the PDSCH is transmitted by adopting the same beam sequence. Namely: and transmitting the PDSCH by using a beam K in a PDSCH timer with the subscript of (V-1) × K + K, wherein V is 1. Preferably, the beam with index k is the beam used when transmitting the SS/PBCH block with index k. The value of the number V of times of repeated transmission when the PDSCH is repeatedly transmitted may be determined according to the reception quality requirement of the PDSCH.
S101: and the UE selects the MBMS needing to be received and receives the configuration information of the MBMS sent by the base station.
Specifically, the UE selects the MBMS to be received, receives each SC-MCCH in the current cell, and obtains the configuration information of the MBMS from SC-PTM configuration information of corresponding BWP loaded on each SC-MCCH. When an MBMS is sent in a semi-static scheduling mode, the configuration information of the MBMS is the semi-static resource configuration information of the MBMS.
Specifically, a server providing an MBMS notifies information such as TMGI corresponding to the MBMS to a UE before broadcasting the MBMS. Therefore, the UE has a TMGI list in which the TMGIs of the respective MBMS being broadcast are stored. The UE selects one TMGI from the list, and determines the configuration information of the MBMS corresponding to the TMGI according to the TMGI and the parameter TMGI included in the received configuration information of each MBMS.
S102: when the UE determines that the configuration information of the MBMS is the semi-static resource configuration information of the MBMS, the UE determines the period of sending the MBMS by the base station, the position of each PDSCH opportunity of sending the MBMS by the base station in each period and the time-frequency resource occupied by the PDSCH in each opportunity according to the configuration information of the MBMS.
Specifically, the UE determines each PDSCH occasion to transmit PDSCH in each period according to the following method based on the configuration information related to the PDSCH occasion in the semi-static resource configuration information of one MBMS.
The parameters obtained by the UE from the PDSCH occasion configuration information include: period T, offset, and the number of occupied occasions Duration, etc. The UE obtains the first PDSCH occasion in each period according to the following two formulas based on these parameters.
SFN and n denote the frame number and slot index of the first PDSCH occasion in each cycle, respectively. SFN is determined by equation (1) and n is determined by equation (2).
Figure BDA0002437454580000091
n＝(offset)modN slot (2)
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002437454580000092
u PDSCH SCS parameters for PDSCH.
Starting from the first PDSCH occasion, PDSCH may be transmitted occupying consecutive or discrete Duration PDSCH occasions. When the PDSCH occupies the discrete Duration PDSCH occasions to be transmitted, the base station also needs to provide a parameter Interval in the PDSCH occasion configuration information, where the parameter is used to indicate the number of slots spaced between two adjacent PDSCH occasions. When the parameter is 0, it indicates that the PDSCH is transmitted with continuous timing. When the parameter is not configured, by default: the PDSCH is transmitted occupying consecutive occasions.
S103: and the UE starts from the latest period and receives the corresponding PDSCH in each PDSCH timer in each period according to the time-frequency resources allocated to the PDSCH.
In a specific implementation manner, for one MBMS, the information included in (3), (4) and (5) in the semi-static resource configuration information of the MBMS generally does not change. And these information are usually applicable to each MBMS on a BWP, so the present application proposes: these three items of information are broadcast by the system information block SIB. For example: these three items of information are broadcast by SIB1 or by newly added SIBs.
When the three items of information are broadcasted by adopting the newly added SIB, the newly added SIB can be sent as required.
Accordingly, after receiving the corresponding SIB transmitted by the base station, the ue may obtain the three pieces of information carried thereon.
When the three items of information are broadcasted through SIB, the content of the three items of information is determined in the semi-static resource configuration information of MBMS according to the following method:
(1) sending the configuration information of BWP of MBMS service: only the following need be included in this item of information: BWP ID, BWP ID is used to indicate the subscript of BWP transmitting MBMS, the configuration information of BWP corresponding to the subscript is seen in corresponding SIB.
(2) Configuration information of search spaces corresponding to PDCCHs scrambled by G-RNTIs for CRC: only the following need be included in this item of information: and subscripts of the search spaces are used for indicating the search spaces corresponding to the PDCCHs scrambled by the G-RNTIs for the CRCs. The specific configuration information of the search space is seen in the corresponding SIB.
(3) Configuration information of search spaces corresponding to PDCCHs scrambled by SPS-G-RNTIs for CRC: only the following need be included in this item of information: and subscripts of the search spaces are used for indicating the search spaces corresponding to the PDCCHs scrambled by the SPS-G-RNTIs by the CRC. The specific configuration information of the search space is seen in the corresponding SIB. When specified in the NR cell defined by the 3GPP protocol: for an MBMS, when a PDCCH carrying the CRC of the MBMS scheduling information scrambled by the G-RNTI and a PDCCH carrying the CRC of the MBMS semi-persistent scheduling information scrambled by the SPS-G-RNTI have the same search space, the information is deleted from the semi-persistent resource configuration information.
In the embodiment of the application, for an MBMS transmitted in a semi-persistent scheduling manner, a user equipment may determine a period for transmitting the MBMS, each PDSCH occasion for transmitting the MBMS in each period, and time-frequency resources occupied by a PDSCH in each occasion by receiving semi-persistent resource configuration information of the MBMS transmitted by a base station. The UE can receive the corresponding PDSCH in each PDSCH timer in each period according to the information. Data of the MBMS carried thereon is obtained from the PDSCH. When the MBMS is transmitted in the semi-static scheduling mode, the scheduling information of the PDSCH in each PDSCH opportunity does not need to be transmitted, and the problem that the PDCCH resources are greatly consumed when the MBMS is transmitted in the dynamic scheduling mode at present is solved.
On the basis of the foregoing embodiments, the present application provides a possible implementation manner for solving the problem of MBMS data burst in a certain period in the semi-persistent scheduling process. Fig. 3 is a flowchart illustrating a method for processing MBMS data burst in semi-persistent scheduling according to an embodiment of the present application. As shown in fig. 3, in the processing method provided in this embodiment of the application, for an MBMS broadcast in a semi-persistent scheduling manner, in a process that a base station periodically transmits a PDSCH carrying MBMS data through semi-persistent resources allocated to the MBMS according to step 100, the base station first determines whether a data amount on the PDSCH carrying the MBMS is suddenly increased in each period, when it is found that the data amount on the PDSCH is suddenly increased in the current period, the base station stops transmitting the PDSCH through the allocated semi-persistent resources in the current period, changes to allocate PDSCH resources and PDCCH resources to the PDSCH carrying the MBMS in a dynamic scheduling manner in the current period, then transmits the PDSCH through the allocated PDSCH resources in the current period, and transmits scheduling information of the PDSCH through the allocated PDCCH resources. And the CRC of the PDCCH is scrambled by G-RNTI, and the G-RNTI is used for identifying the current MBMS.
Specifically, as shown in fig. 3, a method for processing MBMS data burst in semi-persistent scheduling provided in an embodiment of the present application includes:
s200: for the MBMS transmitted in the semi-persistent scheduling mode, the base station judges whether the data volume on the PDSCH in the current period suddenly increases in each period. And if the data volume on the PDSCH suddenly increases in the current period, the base station stops sending the PDSCH through the allocated semi-static resources in the current period. And the next step is performed.
S201: and the base station allocates PDSCH resources to the PDSCH in a dynamic scheduling mode in the current period and allocates PDCCH resources to the PDCCH bearing the PDSCH scheduling information.
Specifically, the base station allocates PDSCH occasions to the PDSCH in the current period, and allocates time-frequency resources to the PDSCH in each PDSCH occasion. And the base station allocates PDCCH occasions and CCE resources to the PDCCH bearing the PDSCH scheduling information in each PDSCH occasion according to each allocated PDSCH occasion.
One possible method for allocating occasions to PDSCH is: the base station determines a starting position for transmitting the PDSCH in the current period. From the starting position, 1 opportunities are allocated to the PDSCH.
Preferably, the base station allocates a PDSCH occasion to the PDSCH starting from a timeslot with index n in a radio frame with index SFN in a current period. If the base station determines that the PDSCH is not repeatedly transmitted in the current period, the number of allocated occasions 1 for the PDSCH is K; if the base station determines that the PDSCH is repeatedly transmitted V1 times in the current period, the number of allocated occasions 1 ═ K × V1 for the PDSCH.
The base station may also determine whether the PDSCH is continuously transmitted in the current period. If the PDSCH is continuously transmitted, 1 continuous time intervals are allocated to the PDSCH; otherwise, the base station determines the interval, allocates 1 discrete occasions to the PDSCH, and the interval between two adjacent occasions is interval.
And the base station determines a search space corresponding to the PDCCH scrambled by the G-RNTI for the CRC, and allocates PDCCH opportunity and CCE resources to the PDCCH carrying the PDSCH scheduling information in the search space. Specifically, for each PDSCH occasion, the base station determines the position of the PDCCH occasion corresponding to the PDCCH that transmits its scheduling information from the position of the PDSCH occasion, and the base station allocates Duration1 PDCCH occasions corresponding to Duration1 PDSCH occasions to the PDCCH in the corresponding search space and allocates CCE resources to the PDCCH in these PDCCH occasions.
In a specific implementation, the timing relationship between the PDSCH transmitted in the time slot n1 and the PDCCH transmitted in the time slot p1 and carrying scheduling information of the PDSCH transmitted in the time slot n1 is as follows, and the PDCCH occasion corresponding to each PDSCH occasion may be determined according to the following formula.
Figure BDA0002437454580000121
Wherein u is PDSCH And u PDCCH Subcarrier spacing SCS parameter, K, for PDSCH and PDCCH, respectively 0 The parameter in the time domain resource configuration information for the PDSCH transmitted in slot n1 is the timing difference between the PDCCH transmitted in slot p1 and the PDSCH transmitted in slot n1, and the PDCCH carries the scheduling information for the PDSCH transmitted in slot n 1.
S202: and the base station transmits the PDSCH by adopting the allocated PDSCH resources and transmits the PDCCH by adopting the allocated PDCCH resources in the current period.
Specifically, if the PDSCH is not repeatedly transmitted in the current cycle, the PDSCH is transmitted using K beams in each of K PDSCH occasions where the duration1 allocated to the PDSCH is equal to K PDSCH occasions. If the PDSCH is repeatedly transmitted V1 times in the current cycle, the time sequence is started from 0 to Duration1 ═ K × V1 time numbers, then the PDSCH time is divided into V1 groups, each group is composed of adjacent K time, K beams are respectively used to transmit PDSCH in the K time included in each group, and the same TB is carried on PDSCH in Duration1 time. And when the PDSCH is transmitted in each group of time machines, the PDSCH is transmitted by adopting the same beam sequence. Namely: and transmitting the PDSCH by using a beam K in a PDSCH timer with the subscript of (V-1) × K + K, wherein V is 1. Preferably, the beam with index k is the beam used when transmitting the SS/PBCH block with index k.
Specifically, the sending of the PDCCH by using the allocated PDCCH resource in the current period is: and transmitting the PDCCH scrambled by the G-RNTI for the CRC in each PDCCH opportunity by adopting the allocated CCE resources, wherein the DCI format on the PDCCH is scheduling information of the PDSCH in the corresponding PDSCH opportunity. The beam used when the PDCCH is transmitted at each PDCCH occasion is a beam used when the PDSCH is transmitted in the corresponding PDSCH occasion. Namely: and transmitting the PDSCH and the PDCCH carrying the PDSCH scheduling information by using the same wave beam.
For the problem of the sudden increase of the MBMS data in a certain period, while the UE receives the MBMS according to step 103, the UE monitors the PDCCH scrambled by the G-RNTI for the CRC in the corresponding search space in each period. When the UE receives the PDCCH scrambled by the G-RNTI for the CRC in a certain period, the UE determines that the PDSCH adopts dynamic scheduling in the current period, the UE obtains scheduling information of the PDSCH according to the DCI format on the PDCCH, receives the PDSCH sent in the dynamic scheduling mode in the current period according to the scheduling information, and obtains data of the MBMS from the PDSCH.
In this embodiment, when the base station finds that the data amount of the MBMS suddenly increases in a certain period, PDSCH resources and PDCCH resources are allocated to the PDSCH carrying the MBMS in the period in a dynamic scheduling manner. The PDSCH resources are used for sending PDSCH bearing MBMS in the period, the PDCCH resources are used for sending PDCCH bearing PDSCH scheduling information in the period, CRC of the PDCCH is scrambled by G-RNTI, and the G-RNTI is G-RNTI of the current MBMS.
During the process of broadcasting an MBMS in a semi-persistent scheduling manner, a scenario may occur in which the current semi-persistent scheduling resource is updated. The method comprises the following specific steps:
in step 100, after the base station configures semi-static resources for an MBMS and broadcasts the MBMS using the configured semi-static resources, the base station may configure new semi-static resources for the MBMS according to a real-time status of a PDU session of the MBMS. When the base station decides to configure a new semi-static resource for an MBMS, the base station determines an SC-MCCH carrying the MBMS configuration information, and broadcasts the configuration information of the new semi-static resource of the MBMS on the SC-MCCH from the latest modification period of the SC-MCCH. From the modification period, the base station periodically transmits the PDSCH carrying the MBMS using new semi-static resources.
If the base station determines to update the semi-static resource of the MBMS in the middle of any modification period of the SC-MCCH bearing the MBMS configuration information, in order to send the corresponding MBMS with the new semi-static resource as soon as possible, before the base station starts to broadcast the new semi-static resource configuration information on the SC-MCCH from the next modification period of the SC-MCCH, the base station determines each old period corresponding to the old semi-static resource configuration information in the remaining time of the current modification period, and the base station stops sending the corresponding PDSCH according to the old semi-static resource configuration information in the old periods and changes to send the new semi-static resource configuration information in the old periods. And after the transmission of the new semi-static resource configuration information is completed in the first old period, the base station periodically transmits the PDSCH by adopting the new semi-static resource. Specifically, the base station transmits the PDCCH scrambled by the SPS-G-RNTI for CRC in each old period, and the DCI format on the PDCCH carries new semi-persistent resource configuration information.
Preferably, in each old cycle, the base station allocates K PDCCH occasions to the PDCCH carrying new semi-static resource allocation information from time slot p, wherein CCE resources are allocated to the PDCCH in each time slot according to the position of the PDCCH occasion corresponding to the PDSCH occasion in which time slot p is time slot n in formula (3). And transmitting the PDCCH by adopting K beams in K PDCCH occasions in each old period, and transmitting the PDCCH by adopting the allocated CCE resources in each occasion. The K beams used in the K PDCCH occasions are K beams used when the SS/PBCH block is transmitted. And adopting the beam adopted by the SS/PBCH block with the index of K in the PDCCH time machine with the index of K of 0, … … and K-1.
For the above problem of semi-persistent resource update of MBMS, while the UE receives MBMS according to step 103, the UE monitors the PDCCH scrambled by the SPS-G-RNTI for CRC in the corresponding search space in each period. When the UE receives the PDCCH scrambled by the SPS-G-RNTI for the CRC in a certain period, the UE obtains new semi-static resource configuration information according to a DCI format on the PDCCH, and the UE determines each period corresponding to the new semi-static resource, each PDSCH opportunity for transmitting the PDSCH in each period and time-frequency resources occupied by the PDSCH in each PDSCH opportunity according to the new semi-static resource configuration information and receives the PDSCH in each period.
In the description of the above embodiments of the present application, since there is only one PDSCH/PDCCH occasion per slot in a normal case, each PDSCH/PDCCH occasion allocated to PDSCH/PDCCH corresponds to one slot.
Fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present application, and as shown in fig. 4, the base station 10 includes:
a broadcast module 11, configured to broadcast semi-static resource configuration information of an MBMS in an NR cell;
a sending module 12, configured to send the PDSCH carrying the MBMS periodically through the semi-static resource allocated to the MBMS.
The base station 10 provided in the embodiment of the present application includes a broadcasting module 11 and a sending module 12, and the base station allocates semi-static resources for an MBMS which is periodically sent and has a fixed data volume in each period to send a PDSCH carrying the MBMS, and determines configuration information of the semi-static resources allocated to the MBMS. The base station broadcasts the configuration information of the semi-static resource of the MBMS, periodically sends the PDSCH bearing the MBMS by adopting the allocated semi-static resource, so that the user equipment receives the semi-static resource configuration information of the MBMS sent by the base station, and periodically receives the PDSCH according to the semi-static resource configuration information. The scheme avoids the need of adopting a plurality of beams to send the PDCCH at a plurality of occasions when the MBMS is transmitted in a dynamic scheduling mode, and greatly reduces the consumption of PDCCH resources.
Fig. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present application, and as shown in fig. 5, the user equipment 20 includes:
a receiving module 21, configured to receive semi-static resource configuration information sent by a base station;
a processing module 22, configured to determine, according to the semi-static resource configuration information, a period in which the base station sends an MBMS, a position of each PDSCH occasion in which the base station sends the MBMS in each period, and a time-frequency resource allocated to the PDSCH by the base station in each occasion;
the receiving module 21 is further configured to receive, in each PDSCH timer in each cycle from the latest cycle, a corresponding PDSCH according to the time-frequency resources allocated to the PDSCH.
The user equipment 20 provided in this embodiment of the present application includes a receiving module 21 and a processing module 22, and for an MBMS transmitted in a semi-persistent scheduling manner, the user equipment may determine a period for transmitting the MBMS, each PDSCH occasion for transmitting the MBMS in each period, and a time-frequency resource allocated to a PDSCH in each occasion by receiving semi-persistent resource allocation information of the MBMS transmitted by a base station. The UE can receive the corresponding PDSCH in each PDSCH timer in each period according to the information. Data of the MBMS carried thereon is obtained from the PDSCH. When the MBMS is transmitted in the semi-static scheduling mode, the scheduling information of the PDSCH in each PDSCH opportunity does not need to be transmitted, and the problem that the PDCCH resources are greatly consumed when the MBMS is transmitted in the dynamic scheduling mode at present is solved.
The base station provided in the embodiment shown in fig. 4 and the user equipment provided in the embodiment shown in fig. 5 may execute the technical solution of the foregoing method embodiment, and the implementation principle and technical effect are similar, which is not described herein again.
Fig. 6 is a block diagram of a structure of a user equipment according to an embodiment of the present application. In general, the user equipment 500 includes: a processor 501 and a memory 502; optionally, a bus 503 may also be included. The bus 503 is used to realize connection between the elements.
The processor 501 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 501 may be implemented in hardware using at least one of a DSP (Digital Signal Processing) device, a FPGA (Field-Programmable Gate Array) device, and a PLA (Programmable Logic Array) device. The processor 501 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 501 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. In some embodiments, processor 501 may also include an AI (Artificial Intelligence) processor for processing computational operations related to machine learning.
Memory 502 may include one or more computer-readable storage media, which may be non-transitory. Memory 502 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in the memory 502 is configured to store at least one instruction for execution by the processor 501 to implement the MBMS transceiving method applied to the user equipment side provided by the method embodiments in the present application.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is not intended to be limiting of user device 500 and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.
Referring to fig. 7, in the embodiment of the present application, the base station is further provided, and the embodiment of the present application is only described by taking fig. 7 as an example, and does not mean that the present application is limited thereto.
Fig. 7 is a block diagram of a base station according to an embodiment of the present disclosure.
In general, the base station 600 includes: a processor 601 and a memory 602; optionally, a bus 603 may also be included. The bus 603 is used for connecting the elements.
Processor 601 may include one or more processing cores, such as 4-core processors, 8-core processors, and so forth. The processor 601 may be implemented in at least one hardware form of a DSP (Digital Signal Processing) device, an FPGA (Field-Programmable Gate Array) device, and a PLA (Programmable Logic Array) device. The processor 601 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 601 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. In some embodiments, processor 601 may also include an AI (Artificial Intelligence) processor for processing computational operations related to machine learning.
The memory 602 may include one or more computer-readable storage media, which may be non-transitory. Memory 602 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in the memory 602 is configured to store at least one instruction for execution by the processor 601 to implement the MBMS transceiving method applied to the base station side provided by the method embodiments in the present application.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is not limiting of base station 600 and may include more or fewer components than shown, or combine certain components, or employ a different arrangement of components.
The embodiments of the present application further provide a non-transitory computer-readable storage medium, where instructions in the storage medium, when executed by a processor of a mobile subscriber, enable the subscriber to perform the MBMS transceiving method provided in the foregoing embodiments.
Embodiments of the present application further provide a computer program product containing instructions, which when run on a computer, cause the computer to execute the MBMS transceiving method provided by the above embodiments.
An embodiment of the present application further provides a computer program, which when running on a computer, causes the computer to execute the MBMS transceiving method.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (15)

1. An MBMS transceiving method, wherein the method is applied to an NR cell broadcasting a multimedia broadcast multicast service MBMS in a single-cell point-to-multipoint SC-PTM manner, the method comprising:
when a base station determines that the MBMS is a service which is periodically transmitted and has a relatively fixed data volume in each period, the base station allocates semi-static resources for the MBMS for periodically transmitting a PDSCH bearing the service, generates semi-static resource configuration information of the MBMS from the allocated semi-static resources, broadcasts the semi-static resource configuration information of the MBMS in the NR cell, and periodically transmits a physical downlink shared channel PDSCH bearing the MBMS through the semi-static resources allocated to the MBMS;
the user equipment receives the semi-static resource configuration information sent by the base station;
the user equipment determines the period of the base station sending the MBMS, the position of each PDSCH occasion of the MBMS sent by the base station in each period and the time-frequency resource allocated to the PDSCH by the base station in each occasion according to the semi-static resource configuration information;
the user equipment receives the corresponding PDSCH in each PDSCH timer in each period from the latest period according to the time-frequency resource allocated to the PDSCH;
the semi-static resource configuration information includes:
(1) a Temporary Mobile Group Identity (TMGI) and a Session identity (Session ID) of the MBMS;
(2) a group-radio network temporary identifier G-RNTI and a semi-persistent scheduling-group-radio network temporary identifier SPS-G-RNTI of the MBMS;
(3) configuration information of bandwidth slice BWP for transmitting MBMS: the subscript of the BWP, the initial position of the BWP, the number of RB (resource block) occupied by the BWP and the SCS (subcarrier spacing) parameter of the BWP;
(4) carrying the configuration information of a search space corresponding to a physical downlink control channel PDCCH scrambled by a G-RNTI for cyclic redundancy check CRC of MBMS dynamic scheduling information;
(5) carrying configuration information of a search space corresponding to a PDCCH scrambled by SPS-G-RNTI of CRC of MBMS semi-persistent scheduling information;
(6) configuration information of PDSCH occasions: period T, offset and PDSCH occasion number Duration;
(7) PDSCH time domain resource allocation information: a PDSCH mapping type in a PDSCH opportunity, a timing difference K0 between a PDCCH carrying PDSCH scheduling information and the corresponding PDSCH, a starting symbol and length indication RIV;
(8) PDSCH frequency domain resource allocation information: starting RB position for sending PDSCH in PDSCH opportunity, RB number occupied by PDSCH and SCS parameter mu of PDSCH PDSCH ；
The UE determines the period of the base station sending the MBMS, the position of each PDSCH occasion of the MBMS sent by the base station in each period and the time-frequency resource allocated to the PDSCH by the base station in each occasion according to the semi-static resource configuration information, and comprises the following steps:
the user equipment calculates the position of the first PDSCH opportunity in each period by adopting a formula (1) and a formula (2);
the frame number SFN of the first PDSCH occasion in each period is determined by formula (1); the time slot index n of the first PDSCH occasion in each period is determined by formula (2);
Figure FDA0003748739040000021
n＝(offset)modN slot (2)
wherein the content of the first and second substances,
Figure FDA0003748739040000022
μ PDSCH SCS parameters employed for PDSCH.
2. The method of claim 1, wherein the periodically transmitting the PDSCH carrying the MBMS data over the semi-static resources allocated to the MBMS comprises:
allocating K occasions for the PDSCH, and respectively adopting K wave beams to transmit the PDSCH in the K occasions;
alternatively, the first and second electrodes may be,
allocating Duration-K × V occasions to the PDSCH, and numbering the K × V occasions from 0 in time order; dividing the K times by V time into V groups, wherein each group consists of K adjacent time, and K wave beams are respectively adopted to send the PDSCH in the K time included in each group;
the number of beams used when the synchronization signal/physical broadcast channel SS/PBCH block is sent in the cell is K, and the number of the beams used when the synchronization signal/physical broadcast channel SS/PBCH block is sent in the cell is K.
3. The method of claim 2, further comprising:
and starting from the first PDSCH opportunity, the base station occupies continuous or discrete Duration PDSCH opportunities to transmit the PDSCH.
4. The method of claim 3, wherein before the base station occupies a continuous or discrete Duration of PDSCH occasions to send the PDSCH starting from the first PDSCH occasion, the method further comprises:
and the user equipment determines whether the PDSCH occasions of Duration of the PDSCH transmitted by the base station are continuous or discrete according to the Interval parameter Interval in the semi-static resource configuration information.
5. The method of claim 1, wherein the base station broadcasts semi-static resource configuration information of the MBMS in a cell, comprising:
and broadcasting and sending the configuration information of BWP of the MBMS, the configuration information of a search space corresponding to PDCCH which is scrambled by G-RNTI for CRC carrying MBMS dynamic scheduling information and the configuration information of a search space corresponding to PDCCH which is scrambled by SPS-G-RNTI for CRC carrying MBMS semi-static scheduling information through a system information block SIB.
6. The method according to any one of claims 1 to 5, further comprising:
the base station determines whether the data volume on the PDSCH carrying the MBMS is suddenly increased in each period;
if the data volume on the PDSCH in the current period suddenly increases, the base station stops sending the PDSCH through the allocated semi-static resources in the current period, and allocates PDSCH resources and PDCCH resources to the PDSCH in a dynamic scheduling mode;
and transmitting the PDSCH through the allocated PDSCH resources in the current period, and transmitting scheduling information of the PDSCH through the allocated PDCCH resources.
7. The method of claim 6, wherein the transmitting the PDSCH via the allocated PDSCH resources in the current period comprises:
the base station determines the starting position for sending the PDSCH in the current period, and allocates 1 occasions to the PDSCH from the starting position;
the frame number SFN and the time slot subscript n of the initial position respectively satisfy the following formula:
Figure FDA0003748739040000031
n＝(offset)modN slot (2)
wherein the content of the first and second substances,
Figure FDA0003748739040000032
μ PDSCH SCS parameters employed for PDSCH.
8. The method of claim 7, wherein the transmitting the PDSCH via the allocated PDSCH resources in the current period comprises:
if the base station determines that the PDSCH is not repeatedly transmitted in the current period, the number Duration1 of the allocated occasions for the PDSCH is K;
if the base station determines that the PDSCH is repeatedly transmitted V1 times in the current period, the number of occasions allocated to the PDSCH Duration1 ═ K × V1.
9. The method of claim 6, further comprising:
the timing relationship between the PDSCH transmitted in the time slot n1 and the PDCCH transmitted in the time slot p1 and carrying scheduling information of the PDSCH transmitted in the time slot n1 is as follows, and the PDCCH occasion corresponding to each PDSCH occasion is determined according to formula (3);
Figure FDA0003748739040000041
wherein, mu PDSCH For SCS parameter of PDSCH, mu PDCCH SCS parameter, K, for PDCCH 0 For the timing difference between the PDCCH transmitted in slot p1 and the PDSCH transmitted in slot n1, the PDCCH carries scheduling information for the PDSCH transmitted in slot n 1.
10. The method according to any one of claims 1 to 5,
the base station determines whether to configure a new semi-static resource for the MBMS according to a preset condition;
if determining that new semi-static resources need to be configured for the MBMS, the base station determines an SC-MCCH carrying the MBMS configuration information, and broadcasts the configuration information of the new semi-static resources of the MBMS on the SC-MCCH from the latest modification period of the SC-MCCH;
and from the modification period, the base station periodically transmits the PDSCH carrying the MBMS by adopting new semi-static resources.
11. The method according to any one of claims 1 to 5,
if the base station determines to update the semi-static resource of the MBMS in the middle of any modification period of an SC-MCCH bearing the MBMS configuration information, before the base station starts to broadcast new semi-static resource configuration information on the SC-MCCH from the next modification period of the SC-MCCH, the base station determines each old period corresponding to the old semi-static resource configuration information in the remaining time of the current modification period, the base station stops sending PDSCH according to the old semi-static resource configuration information in each old period, changes to sending new semi-static resource configuration information in each old period, and adopts the new semi-static resource to periodically send PDSCH bearing the MBMS after sending the new semi-static resource configuration information for the first time;
wherein the sending new semi-static resource configuration information in each old cycle includes: and the base station sends a PDCCH scrambled by SPS-G-RNTI for CRC in each old period, and the DCI format on the PDCCH bears new semi-static resource configuration information.
12. A base station, comprising:
a broadcast module, configured to allocate semi-static resources for the MBMS to periodically send a PDSCH carrying the service when the MBMS is determined to be a service that is periodically sent and has a relatively fixed data volume in each period, generate semi-static resource configuration information of the MBMS from the allocated semi-static resources, and broadcast the semi-static resource configuration information of the MBMS in an NR cell; the semi-static resource configuration information includes:
(1) temporary Mobile Group Identity (TMGI) and Session identity (Session ID) of MBMS;
(2) a group-radio network temporary identifier G-RNTI and a semi-persistent scheduling-group-radio network temporary identifier SPS-G-RNTI of the MBMS;
(3) configuration information of bandwidth slice BWP for transmitting MBMS: the subscript of the BWP, the initial position of the BWP, the number of RB (resource block) occupied by the BWP and the SCS (subcarrier spacing) parameter of the BWP;
(4) carrying the configuration information of a search space corresponding to a physical downlink control channel PDCCH scrambled by a G-RNTI for cyclic redundancy check CRC of MBMS dynamic scheduling information;
(5) carrying configuration information of a search space corresponding to a PDCCH scrambled by SPS-G-RNTI of CRC of MBMS semi-persistent scheduling information;
(6) configuration information of PDSCH occasions: period T, offset, and PDSCH occasion number Duration;
(7) PDSCH time domain resource allocation information: a PDSCH mapping type in a PDSCH opportunity, a timing difference K0 between a PDCCH carrying PDSCH scheduling information and the corresponding PDSCH, a starting symbol and length indication RIV;
(8) PDSCH frequency domain resource allocation information: starting RB position for sending PDSCH in PDSCH opportunity, RB number occupied by PDSCH and SCS parameter mu of PDSCH PDSCH ；
And the sending module is used for periodically sending the PDSCH carrying the MBMS through the semi-static resources allocated to the MBMS.
13. A user device, comprising:
the receiving module is used for receiving the semi-static resource configuration information sent by the base station;
a processing module, configured to determine, according to the semi-static resource configuration information, a period in which the base station sends an MBMS, a position of each PDSCH occasion in which the base station sends the MBMS, and a time-frequency resource allocated to the PDSCH in each occasion;
the receiving module is further configured to receive, in each PDSCH timer in each cycle from a latest cycle, a corresponding PDSCH according to the time-frequency resources allocated to the PDSCH;
the processing module is further configured to calculate a position of a first PDSCH opportunity in each period by using a formula (1) and a formula (2); the frame number SFN of the first PDSCH occasion in each period is determined by formula (1); the time slot index n of the first PDSCH occasion in each period is determined by formula (2);
Figure FDA0003748739040000061
n＝(offset)modN slot (2)
wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003748739040000062
μ PDSCH SCS parameters employed for PDSCH.
14. A base station, comprising: a memory and a processor;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored in the memory, so that the processor performs the MBMS transceiving method of the base station side according to any one of claims 1 to 11.
15. A user device, comprising: a memory and a processor;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored in the memory, so that the processor performs the MBMS transceiving method of the user equipment side according to any one of claims 1 to 11.
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