CN113453167B - Method, device and equipment for sending multimedia broadcast multicast service scheduling information - Google Patents

Method, device and equipment for sending multimedia broadcast multicast service scheduling information Download PDF

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CN113453167B
CN113453167B CN202010232290.8A CN202010232290A CN113453167B CN 113453167 B CN113453167 B CN 113453167B CN 202010232290 A CN202010232290 A CN 202010232290A CN 113453167 B CN113453167 B CN 113453167B
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pdcch
search space
mbms
pdsch
scheduling information
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CN113453167A (en
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魏立梅
袁乃华
陈迎
范晨
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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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 embodiment of the invention provides a method, a device and equipment for sending multimedia broadcast multicast service scheduling information, wherein the method comprises the following steps: determining a control resource set and a search space corresponding to a Physical Downlink Control Channel (PDCCH), wherein the PDCCH is used for bearing Multimedia Broadcast Multicast Service (MBMS) scheduling information; allocating air interface resources to the PDCCH according to the control resource set and the search space; and sending a PDCCH through the allocated air interface resources, wherein the PDCCH bears MBMS scheduling information. The method realizes the broadcast of the MBMS scheduling information in the NR cell, and the UE receives the corresponding MBMS according to the MBMS scheduling information.

Description

Method, device and equipment for sending multimedia broadcast multicast service scheduling information
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a method, a device and equipment for sending multimedia broadcast multicast service scheduling information.
Background
Multimedia Broadcast Multicast Service (MBMS) is a typical Service of LTE system in 3GPP (The 3rd Generation Partnership Project) protocol, and can be Broadcast in LTE cells via MBMS bearer. Specifically, there are two ways of carrying and broadcasting MBMS through MBMS: one is to Broadcast the MBMS in a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) mode; the other is to broadcast MBMS in a Single Cell Point to Multipoint (SC-PTM) mode. In order for the UE to receive the MBMS broadcast in the SC-PTM manner in the LTE cell, scheduling information of the MBMS needs to be broadcast through the PDCCH in the cell.
With the widespread use of the LTE system, the era of wireless internet has been opened. Wireless internet has developed more diverse demands for wireless networks, including not only higher system throughput, but also lower transmission delay, higher reliability, and a greater number of connected users. To meet these demands, 5G systems have come into force. Fig. 1 is a schematic diagram of an NG-RAN (Next Generation Radio Access Network) architecture according to an embodiment of the present invention. As shown in fig. 1, the gNB is a base station of a 5G system, the cell controlled by the gNB is an NR cell, the ng-eNB is an LTE-enhanced base station accessing a 5G core network, and the cell controlled by the ng-eNB is an LTE cell. The gNB and the NG-eNB are respectively connected with the 5GC through NG interfaces, the gNB is interconnected through an Xn interface, the gNB is connected with the NG-eNB through an Xn interface, and the NG-eNB is interconnected through an Xn interface. At present, for the MBMS broadcast in the SC-PTM mode in the NR cell, no solution exists how to broadcast the scheduling information of the MBMS in the NR cell.
Disclosure of Invention
The embodiment of the invention provides a method, a device and equipment for sending multimedia broadcast multicast service scheduling information, which are used for realizing the broadcast of MBMS scheduling information in an NR cell.
In a first aspect, an embodiment of the present invention provides a method for sending scheduling information of a multimedia broadcast multicast service, where the method includes:
configuring each control resource set and each search space corresponding to a Physical Downlink Control Channel (PDCCH), wherein the PDCCH is used for bearing Multimedia Broadcast Multicast Service (MBMS) scheduling information;
for an MBMS, determining each search space corresponding to a PDCCH carrying scheduling information of the MBMS according to BWP in which the MBMS is located, and trying to allocate PDCCH opportunities and CCE resources to the PDCCH carrying the scheduling information of the MBMS in each search space in sequence;
after PDCCH occasions and CCE resources are successfully allocated to the PDCCH in a search space, on BWP where the search space is located, the PDCCH scrambled by a group radio network temporary identifier G-RNTI for Cyclic Redundancy Check (CRC) is respectively transmitted in each allocated PDCCH occasion in the search space by adopting the allocated CCE resources, and the DCI format on the PDCCH transmitted in each PDCCH occasion is that scheduling information of a PDSCH of the MBMS is carried in the corresponding PDSCH occasion of a Physical Downlink Shared Channel (PDSCH); the G-RNTI is used for identifying the MBMS.
In a possible embodiment, configuring each control resource set and each search space corresponding to the PDCCH includes:
configuring each control resource set corresponding to the PDCCH in the new wireless NR cell;
configuring each search space for each configured control resource set; the search space is a search space mapped onto the set of control resources.
In one possible embodiment, the configured search space comprises a cell-level search space and/or a bandwidth slice BWP-level search space; the cell level search space is used for carrying scheduling information of each MBMS in a cell; the BWP level search space is used to carry scheduling information for MBMS on one or more BWPs.
In a possible implementation manner, after configuring each control resource set and each search space corresponding to the PDCCH, the method further includes:
broadcasting the configuration information of each control resource set and the configuration information of each search space mapped to the control resource set in the current NR cell through SIB1 or a newly added SIB; when the configuration information is broadcasted by adopting the newly added SIB, the newly added SIB can be sent as required.
In a possible implementation manner, for an MBMS, determining, according to a BWP where the MBMS is located, search spaces corresponding to PDCCHs carrying scheduling information of the MBMS, and sequentially attempting to allocate PDCCH occasions and CCE resources to PDCCHs carrying the scheduling information of the MBMS in each of the search spaces, includes:
distributing K PDSCH occasions to a PDSCH for each transmission of a physical downlink shared channel PDSCH carrying the MBMS, wherein the PDSCH is respectively transmitted by adopting K beams in the K occasions, the K is the number of the beams adopted when an SS/PBCH block in a current NR cell is transmitted, the K beams are the K beams adopted when the SS/PBCH block in the current NR cell is transmitted, and the positions of the corresponding K PDCCH occasions are determined according to the positions of the PDSCH occasions; the K PDCCH occasions respectively bear scheduling information of the PDSCH bearing the MBMS in the K PDSCH occasions;
determining states of the K PDCCH occasions in the search space;
and if the state of each PDCCH opportunity is an idle state, allocating the K PDCCH opportunities to the PDCCH in the search space, and allocating CCE resources to the PDCCH in the K PDCCH opportunities respectively.
In one possible embodiment, after a PDCCH occasion and CCE resources are successfully allocated to the PDCCH in one search space, the method includes, on a BWP where the search space is located, transmitting, in each allocated PDCCH occasion, a PDCCH scrambled with a group radio network temporary identifier G-RNTI for cyclic redundancy check CRC, using the allocated CCE resources in the search space, and transmitting, on the PDCCH transmitted in each PDCCH occasion, scheduling information of a PDSCH carrying the MBMS in a corresponding PDSCH occasion on a physical downlink shared channel, in a DCI format, includes:
respectively adopting K wave beams to send the PDCCH in the K PDCCH occasions, adopting the wave beams adopted when the PDSCH in a kth PDSCH occasion is sent when the PDCCH is sent in the kth PDCCH occasion, wherein the DCI format on the PDCCH in the kth PDCCH occasion is the dispatching information of the PDSCH in the kth PDSCH occasion; k is 1, … …, K;
performing corresponding processing on the PDCCH and a demodulation reference signal (DMRS) of the PDCCH before the PDCCH is transmitted at each PDCCH occasion.
In one possible embodiment, the performing the corresponding processing on the PDCCH includes:
performing bit scrambling, modulation and physical resource mapping processing on the PDCCH; wherein, when performing bit scrambling, the pseudo-random sequence generator is initialized by:
c1-init＝(nRNTI·216+nID)mod 231
wherein n isIDFor PDCCH to addScrambling ID, configuring n according to preset modeID；nRNTISetting n for RNTI adopted by UE as a receiving party according to a preset modeRNTI；
Performing corresponding processing on the DMRS of the PDCCH, including:
generating a DMRS sequence of the PDCCH and mapping to a physical resource; when the DMRS sequence is generated, the pseudo-random sequence generator is initialized according to the following formula:
Figure BDA0002429626350000041
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002429626350000042
for the number of symbols included in one slot,
Figure BDA0002429626350000043
index of time slot in a radio frame when SCS parameter of NR cell is mu, l is index of symbol in a time slot, NIDE {0, 1.. 65535} is scrambling ID of DMRS of PDCCH, and N is determined according to a preset modeIDThe value of (c).
In a second aspect, an embodiment of the present invention provides an apparatus for sending scheduling information of a multimedia broadcast multicast service, where the apparatus includes:
the device comprises a configuration module, a search module and a resource allocation module, wherein the configuration module is used for configuring each control resource set and each search space corresponding to a physical downlink control channel PDCCH, and the PDCCH is used for bearing multimedia broadcast multicast service MBMS scheduling information;
an allocation module, configured to determine, for an MBMS, search spaces corresponding to PDCCHs carrying scheduling information of the MBMS according to a BWP in which the MBMS is located, and attempt to allocate PDCCH opportunities and CCE resources to PDCCHs carrying the scheduling information of the MBMS in each search space in sequence;
a sending module, configured to send, on BWP where a search space is located, PDCCHs scrambled with a group radio network temporary identifier G-RNTI for a cyclic redundancy check CRC in each allocated PDCCH occasion by using the allocated CCE resource in the search space after PDCCH occasions and CCE resources are successfully allocated for the PDCCHs in the search space, where a DCI format on a PDCCH sent in each PDCCH occasion is scheduling information of a PDSCH carrying the MBMS in a corresponding PDSCH occasion of a physical downlink shared channel; the G-RNTI is used for identifying the MBMS.
In a possible implementation manner, the configuration module is specifically configured to:
configuring each control resource set corresponding to the PDCCH in the new wireless NR cell;
configuring each search space for each configured control resource set; the search space is a search space mapped onto the set of control resources.
In one possible embodiment, the configured search space comprises a cell-level search space and/or a bandwidth slice BWP-level search space; the cell level search space is used for carrying scheduling information of each MBMS in a cell; the BWP level search space is used to carry scheduling information for MBMS on one or more BWPs.
In a possible embodiment, the apparatus further comprises a broadcasting module;
the broadcast module is configured to, after configuring each control resource set and each search space corresponding to the PDCCH, broadcast configuration information of each control resource set and configuration information of each search space mapped to the control resource set in the current NR cell through SIB1 or a newly added SIB; when the configuration information is broadcasted by adopting the newly added SIB, the newly added SIB can be sent as required.
In a possible implementation, the allocation module is specifically configured to:
distributing K PDSCH occasions to a PDSCH for each transmission of a physical downlink shared channel PDSCH carrying the MBMS, wherein the PDSCH is respectively transmitted by adopting K beams in the K occasions, the K is the number of the beams adopted when an SS/PBCH block in a current NR cell is transmitted, the K beams are the K beams adopted when the SS/PBCH block in the current NR cell is transmitted, and the positions of the corresponding K PDCCH occasions are determined according to the positions of the PDSCH occasions; the K PDCCH occasions respectively bear scheduling information of the PDSCH bearing the MBMS in the K PDSCH occasions;
determining states of the K PDCCH occasions in the search space;
and if the state of each PDCCH opportunity is an idle state, allocating the K PDCCH opportunities to the PDCCH in the search space, and allocating CCE resources to the PDCCH in the K PDCCH opportunities respectively.
In a possible implementation manner, the sending module is specifically configured to:
respectively adopting K wave beams to send the PDCCH in the K PDCCH occasions, adopting the wave beams adopted when the PDSCH is sent in the kth PDCCH occasion, and adopting the DCI format on the PDCCH in the kth PDCCH occasion as the dispatching information of the PDSCH in the kth PDSCH occasion; k is 1, … …, K;
and performing corresponding processing on the PDCCH and the DMRS of the PDCCH before the PDCCH is transmitted at each PDCCH occasion.
In a possible implementation manner, the sending module is specifically configured to:
performing bit scrambling, modulation and physical resource mapping processing on the PDCCH; wherein, when performing bit scrambling, the pseudo-random sequence generator is initialized by:
c1-init＝(nRNTI·216+nID)mod 231
wherein n isIDScrambling ID for PDCCH, configuring n according to preset modeID；nRNTISetting n for RNTI adopted by UE as a receiving party according to a preset modeRNTI；
Performing corresponding processing on the DMRS of the PDCCH, including:
generating a DMRS sequence of the PDCCH and mapping to a physical resource; when the DMRS sequence is generated, the pseudo-random sequence generator is initialized according to the following formula:
Figure BDA0002429626350000061
wherein the content of the first and second substances,
Figure BDA0002429626350000062
for the number of symbols included in one slot,
Figure BDA0002429626350000063
index of time slot in a radio frame when SCS parameter of NR cell is mu, l is index of symbol in a time slot, NIDE {0, 1.. 65535} is scrambling ID of DMRS of PDCCH, and N is determined according to a preset modeIDThe value of (c).
In a third aspect, an embodiment of the present invention provides a device for sending scheduling information of a multimedia broadcast multicast service, including: at least one processor and memory;
the memory is used for storing computer execution instructions;
the at least one processor is configured to execute the computer-executable instructions stored in the memory, so that the at least one processor executes the method for scheduling information of a multimedia broadcast multicast service according to any one of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer executing instruction is stored, and when a processor executes the computer executing instruction, the method for sending mbms scheduling information according to any one of the above first aspects is implemented.
The method, the device and the equipment for sending the multimedia broadcast multicast scheduling information provided by the embodiment of the invention are characterized in that firstly, each control resource set and each search space corresponding to a Physical Downlink Control Channel (PDCCH) are configured, and the PDCCH is used for bearing the Multimedia Broadcast Multicast Service (MBMS) scheduling information; for an MBMS, determining each search space corresponding to a PDCCH carrying scheduling information of the MBMS according to BWP in which the MBMS is located, and trying to allocate PDCCH opportunities and CCE resources to the PDCCH carrying the scheduling information of the MBMS in each search space in sequence; after a PDCCH opportunity and CCE resources are successfully allocated to the PDCCH in a search space, on the BWP where the search space is located, in the search space, the PDCCH scrambled by the G-RNTI for CRC is transmitted by adopting the allocated CCE resources in each allocated PDCCH opportunity, and the DCI format on the PDCCH transmitted in each PDCCH opportunity is that the scheduling information of the PDSCH of the MBMS is carried in the corresponding PDSCH opportunity of the physical downlink shared channel. In this way, it is possible to realize the MBMS scheduling information broadcast in the NR cell.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an NG-RAN architecture according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for sending scheduling information of a multimedia broadcast multicast service according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a sending apparatus for scheduling information of a multimedia broadcast multicast service according to an embodiment of the present invention;
fig. 4 is a schematic hardware structure diagram of a device for sending mbms scheduling information according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be 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.
MBMS is a typical service of LTE system in 3GPP (The 3rd Generation Partnership Project) protocol, which can be broadcast within an LTE cell by MBMS bearer. Specifically, there are two ways of carrying and broadcasting MBMS through MBMS: one is to Broadcast the MBMS in a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) mode; the other is to broadcast the MBMS in a Single Cell Point to Multipoint (SC-PTM) manner. In order for the UE to receive the MBMS broadcast in the SC-PTM manner in the LTE cell, scheduling information of the MBMS needs to be broadcast through the PDCCH in the cell.
With the widespread use of the LTE system, the era of wireless internet has been opened. Wireless internet has developed more diverse demands for wireless networks, including not only higher system throughput, but also lower transmission delay, higher reliability, and a greater number of connected users. To meet these demands, 5G systems have come into force. Fig. 1 is a schematic diagram of an NG-RAN (Next Generation Radio Access Network) architecture according to an embodiment of the present invention. As shown in fig. 1, the gNB is a base station of a 5G system, the cell controlled by the gNB is an NR cell, the ng-eNB is an LTE-enhanced base station accessing a 5G core network, and the cell controlled by the ng-eNB is an LTE cell. The gNB and the NG-eNB are respectively connected with the 5GC through NG interfaces, the gNB is interconnected through an Xn interface, the gNB is connected with the NG-eNB through an Xn interface, and the NG-eNB is interconnected through an Xn interface. At present, for the MBMS broadcast in the SC-PTM mode in the NR cell, no solution exists for how to broadcast the scheduling information of the MBMS in the NR cell. In order to solve the problem, the present application provides a method for sending scheduling information of an MBMS in an NR cell, which can implement broadcasting of the scheduling information of the MBMS in the NR cell. The method comprises the following specific steps:
in the NR cell, in order to distinguish different MBMS over the air interface, a unique G-RNTI (Group-Radio Network temporary Identity) is allocated to each MBMS broadcast in the SC-PTM manner. How to allocate a G-RNTI to an MBMS is not the content of the present invention and will not be described in detail. For the MBMS broadcast in the SC-PTM manner, the gNB carries data of the MBMS through a PDSCH (Physical Downlink Shared Channel). When the PDSCH carrying the MBMS is broadcasted every time, the gNB allocates K PDSCH occasions to the PDSCH, and allocates time-frequency resources to the PDSCH in each PDSCH occasion. And the PDSCH carrying the MBMS is respectively transmitted by adopting K wave beams in K PDSCH occasions, and distributed time-frequency resources are adopted when the PDSCH is transmitted in each occasion. Here, K is the number of beams used when the SS/PBCH (Synchronization Signal/Physical Broadcast Channel) block is transmitted in the current NR cell, and K beams used when the PDSCH is transmitted are K beams used when the SS/PBCH block is transmitted. Preferably, the beam used in the kth (K ═ 1,2, …, K) occasion is the beam used by the SS/PBCH block with index K each time the PDSCH is broadcast.
In order to enable the UE to receive the MBMS broadcast in the SC-PTM manner in the NR cell, scheduling information of PDSCH in each PDSCH occasion, that is, time-frequency resource allocation information of PDSCH in each PDSCH occasion needs to be transmitted in the cell. In the present application, the MBMS scheduling information is scheduling information of PDSCH carrying MBMS in each PDSCH timer. And the UE can receive the PDSCH in each time according to the received scheduling information of the PDSCH in each time, and acquire MBMS data from the PDSCH.
The application proposes: in the NR cell, scheduling Information of the MBMS is carried in a DCI (Downlink Control Information) format on a PDCCH scrambled with a G-RNTI through CRC (Cyclic Redundancy Check). The method comprises the following specific steps:
first, Control Resource sets are configured for PDCCHs carrying MBMS scheduling information in a cell, and each search space mapped to each configured Control Resource Set (CORESET: Control Resource Set) is determined. When the search space is configured on each control resource set, a cell-level search space and a BWP (bandwidth slice or bandwidth slice) level search space may be configured. Each cell-level search space is used to carry scheduling information for each MBMS in the cell. Each BWP level search space is only used to carry scheduling information for MBMS on a certain BWP or BWPs.
A Control resource set and any search space thereon jointly define the BWP in which the search space is located, the position of each PDCCH occasion included in each monitoring period in the search space, the set of CCE (Control Channel Element) resources that can be used in each PDCCH occasion, and the starting position of each PDCCH candidate at different aggregation levels on the set.
Then, for one MBMS, the search space corresponding to the PDCCH carrying its scheduling information is determined according to the BWP in which the MBMS is located. When the MBMS corresponds to more than one search space, it is tried to allocate CCE resources to the PDCCH carrying scheduling information thereof in each search space in turn. When CCE resources are successfully allocated to the PDCCH in one search space, subsequent processing is performed. When CCE resources cannot be successfully allocated for the PDCCH in all search spaces, the process is ended.
CCE resources are allocated to PDCCHs carrying MBMS scheduling information within one search space in the following manner.
For PDSCH carrying MBMS, allocating K PDSCH occasions to PDSCH for each PDSCH transmission, and determining the positions of the corresponding K PDCCH occasions according to the positions of the PDSCH occasions. The kth PDCCH occasion is used to carry scheduling information of the kth PDSCH occasion.
Within the search space, a state of each PDCCH occasion is determined among the respective PDCCH occasions included in each monitoring period. When a PDCCH occasion is allocated to a PDCCH, the occasion state is "occupied", otherwise the occasion state is "idle". And determining whether the K PDCCH occasions are idle in a search space. And if the search space is idle, allocating the K PDCCH occasions to the PDCCH in the search space. After K PDCCH occasions are allocated for the PDCCH, CCE resources are further allocated to the PDCCH within each PDCCH occasion. When CCE resources are successfully allocated to the PDCCHs in each PDCCH time machine, CCE resources are successfully allocated to the PDCCHs in the search space. When the CCE resource allocation for the PDCCH in the search space is successful, the states of the K PDCCH occasions allocated to the PDCCH are updated to 'occupied', and the PDCCH occasions cannot be allocated to other PDCCHs.
And finally, on the BWP where the search space is located, in the search space, respectively transmitting PDCCHs scrambled by G-RNTI for CRC in the allocated K PDCCH occasions by adopting the allocated CCE resources, wherein the DCI format on the PDCCH transmitted in each PDCCH occasion is the scheduling information of the PDSCH in the corresponding PDSCH time. Wherein, the beam used when the PDCCH is transmitted at the kth PDCCH occasion is the beam used when the PDSCH is transmitted at the kth PDSCH occasion.
The configured control resource sets and the configuration information of the search spaces configured on each control resource set are broadcasted to the UE. And the UE selects the search space to be monitored according to the requirement. And the UE monitors each PDCCH opportunity included in each monitoring period in the selected search space, and monitors each candidate PDCCH under different aggregation levels in each PDCCH opportunity to acquire the PDCCH scrambled by the G-RNTI for CRC. When the UE monitors that a candidate PDCCH under a certain aggregation level is a PDCCH scrambled by a G-RNTI for CRC at a certain PDCCH opportunity, the UE acquires the scheduling information of the MBMS according to the DCI format on the PDCCH. And receiving a PDSCH carrying the MBMS according to the MBMS scheduling information.
The technical means shown in the present application will be described in detail below with reference to specific examples. It should be noted that the following embodiments may be combined with each other, and the description of the same or similar contents in different embodiments is not repeated.
Fig. 2 is a flowchart illustrating a method for sending scheduling information of a multimedia broadcast multicast service according to an embodiment of the present invention, please refer to fig. 2, where the method is applied to a 5G wireless access network system, and the method may be executed by a gNB. The method can comprise the following steps:
s201: control resource sets are configured for PDCCH carrying MBMS scheduling information in a cell, and each search space mapped to the control resource sets (CORESET) is determined for each configured control resource set. When the search space is configured on each control resource set, a cell-level search space and/or a BWP-level search space may be configured. Each cell level search space is used to carry scheduling information for each MBMS in the cell. Each BWP level search space is only used to carry scheduling information for MBMS on a certain BWP or BWPs. A control resource set and any search space thereon jointly define the BWP where the search space is located, the position of each PDCCH occasion included in each monitoring period in the search space, the set of CCE resources that can be used in each PDCCH occasion, and the starting position of each PDCCH candidate at different aggregation levels on the set. The configuration information of each control resource set and the configuration information of each search space mapped to the control resource set are broadcasted in the current NR cell through SIB1 or a newly added SIB. And when the configuration information is broadcasted by adopting the newly-added SIB, the newly-added SIB is sent according to the requirement.
For each PDSCH occasion of a PDSCH carrying MBMS, the PDCCH carrying MBMS scheduling information is used for carrying the scheduling information of the MBMS corresponding to the occasion, the CRC of the PDCCH is scrambled by G-RNTI, and the G-RNTI is used for identifying the MBMS in an NR cell.
Specifically, in the present application, each MBMS may be transmitted through different BWPs, so that there may be more than one control resource set corresponding to a PDCCH carrying MBMS scheduling information, and there may also be more than one search space mapped to one control resource set for scheduling CCE resources to the PDCCH.
Such as: there are three BWPs in the NR cell that broadcast MBMS in SC-PTM: BWP1, BWP3 and BWP4, scheduling information of each MBMS on BWP1 is carried by control resource set CORESET1 and search space SS1 thereon, CORESET1 is located on BWP1, scheduling information of each MBMS on BWP3 is carried by control resource set CORESET2 and search space SS2 thereon, CORESET2 is located on BWP3, and scheduling information of each MBMS on BWP4 is carried by control resource set CORESET2 and search space SS3 thereon.
For a BWP broadcasting MBMS in SC-PTM, preferably, the PDCCH carrying each MBMS scheduling information on the BWP only corresponds to a search space on a control resource set configured on the BWP, that is: for a BWP, the PDCCH carrying the MBMS scheduling information on the BWP is transmitted only in a certain search space on a certain set of control resources configured on the current BWP.
However, the present application also does not limit that the PDCCH carrying each MBMS scheduling information on one BWP corresponds to more than one control resource set and search space. Namely: for one BWP, the PDCCH carrying the respective MBMS scheduling information on the BWP may be transmitted on more than one search space, and the respective search spaces may be located on different BWPs. Specifically, at each transmission, the PDCCH is transmitted only in one of the corresponding search spaces.
Specifically, the control resource sets corresponding to the PDCCHs carrying the MBMS scheduling information may be configured in the following manner, and each search space used by the PDCCHs carrying the MBMS scheduling information on each control resource set may be configured in the following manner:
CRC of PDCCH bearing MBMS scheduling information is scrambled by G-RNTI corresponding to MBMS, a Control Resource Set corresponding to the PDCCH is represented by CORESET-T (Control Resource Set for SC-MTCH, a Control Resource Set corresponding to the SC-MTCH, which is abbreviated as CORESET-T), a Search Space for sending the PDCCH bearing MBMS scheduling information on the Control Resource Set is represented by CSS-T (CSS-T: Common Search Space for SC-MTCH, a Common Search Space corresponding to the SC-MTCH, which is abbreviated as CSS-T), and the type of the corresponding Search Space is as follows: COMMON (public).
The aggregation level L adopted by CSS-T on CORESET-T and the number N (L) of PDCCH candidates under each aggregation level are shown in Table 1.
Table 1: relation table of aggregation level L and total number N (L) of PDCCH candidates under each aggregation level
CCE aggregation level (L) Number of PDCCH candidates N (L)
4 N(4)
8 N(8)
16 N(16)
2 N(2)
1 N(1)
In table 1, a CCE Aggregation Level (CCE Aggregation Level) L is the number of CCEs occupied by one PDCCH, and the CCE Aggregation Level L may be 1,2, 4, 8, and 16. N (L) is the Number of PDCCH Candidates (Numbers of Candidates) with aggregation level L.
Since CSS-T is a common search space and a corresponding PDCCH is broadcast in a cell, in an actual scenario where scheduling information is transmitted through the PDCCH, it is difficult to adopt an aggregation level L of 1 or L of 2, and preferably, the aggregation level L of CSS-T is 4, 8, and 16. In table 1, n (l) is an integer not less than 0, and specific values of n (l) are not specifically agreed in this application.
In an NR cell, the entire system bandwidth is divided into BWPs, and the MBMS in the cell may be transmitted in the initial BWP or in other BWPs.
In order to satisfy the condition that the PDCCH carrying the MBMS scheduling information is broadcast in the whole cell, the CORESET-T and the CSS-T are configured in the following way.
Specifically, the configuration information of a CORESET-T includes the following contents:
(1) CORESET-T is located under the subscript of BWP.
(2) Subscript of CORESET-T: the subscript may be defined by one of the following:
the first method is as follows: numbering CORESET-T in all CORESETs in the cell;
the second method comprises the following steps: the number of CORESET-T in all CORESETs defined within the current BWP;
the third method comprises the following steps: when there is more than one CORESET-T in a cell, the current CORESET-T is numbered among all CORESET-Ts.
(3) Length of PDCCH occasion: the total number of continuous symbols occupied by the PDCCH opportunity is within the value range: 1,2,3.
(4) Frequency resources occupied by CORESET: a set of RBs (Resource Block) allocated to the current control Resource set.
(5) Mapping mode from CCE to REG: non-interleaved mapping or interleaved mapping.
There is explicit provision in the 3GPP protocol for: the mapping manner from CCE to REG (Resource Element Group) in CORESET-T may be: non-interleaved mapping/interleaved mapping.
When the CORESET-T is specified to fixedly adopt a non-interleaving mapping mode or fixedly adopt an interleaving mapping mode, parameters for indicating the mapping mode from CCE to REG do not need to be carried in the configuration information of the CORESET-T.
When the mapping mode from the CCE to the REG in the CORESET-T is allowed to be flexibly configured, the mapping mode from the CCE to the REG adopted by the current CORESET-T needs to be indicated by a parameter of 1 bit in the configuration information of the current CORESET-T.
When this parameter is not configured, by default: no interleaving mapping is used.
When the core-M adopts interleaving mapping, the configuration information of the core-T needs to be carried: REG bundle length L, interleaving depth R and interleaver offset nshiftWherein, the length L of the REG bundle is the number of REGs included in each REG bundle; the interleaving depth R is: the interleaver includes a number of rows. When the interleaver offset n is not configuredshiftThen, default is as follows:
Figure BDA0002429626350000131
the following may be specified in the 3GPP protocol: when the interleaving mapping manner is adopted, if L and R are not configured, L and R may take default values, and preferably, the default values may be: l is 6 and R is 2.
When a search space is configured on one control resource set, a cell-level search space and/or a BWP-level search space may be configured. Each cell level search space is used to carry scheduling information for each MBMS in the cell. Each BWP level search space is only used to carry scheduling information for MBMS on a certain BWP or BWPs. For the BWP level search space, each BWP corresponding to the corresponding search space is specified, and the search space only carries the scheduling information of the MBMS on these BWPs.
For a control resource set, the configuration information of any one of the CSS-Ts mapped thereto includes the following:
(1) search space subscript: the subscript may be defined by one of the following:
the first method is as follows: number of CSS-T in all SS (search Space) in the cell;
the second method comprises the following steps: the number of CSS-T in all SSs defined within the BWP in which CSS-T is located;
the third method comprises the following steps: the number of CSS-T in all CSS defined in the BWP where CSS-T is located;
the method is as follows: the number of CSS-T in all CSS-T defined within the BWP in which CSS-T is located;
the fifth mode is as follows: the number of the current CSS-T in all CSS-Ts in the cell;
(2) subscript of the corresponding CORESET-T.
(3) PDCCH monitoring period ks(unit: slot) and PDCCH monitoring offset os。
(4) PDCCH monitoring mode: the subscript of the first symbol of CORESET-T in the time slot for monitoring PDCCH, the parameter and the length of PDCCH occupancy (opportunity) in the CORESET-T configuration information jointly determine the specific position of each PDCCH occupancy.
(5) Searching for the number of spatially-persistent slots T within a monitoring periods：Ts<ks。
(6) The number N (L) of candidate PDCCHs under the aggregation level L to be monitored in each PDCCH monitoring opportunity; wherein, L is 1,2, 4, 8, 16. Preferably, L takes the values: and L is 4, 8 and 16.
(7) Search space type: COMMON.
(8) The RNTI and DCI formats to be monitored in the search space: see table 2. In Table 2, the CRC of the PDCCH is scrambled by G-RNTI, and the initial value of the pseudo-random sequence generator of the PDSCH is generated based on the G-RNTI.
Table 2: PDCCH and PDSCH defined by G-RNTI
Figure BDA0002429626350000141
In addition, the configuration information of CSS-T further includes:
(1) level indication: for indicating whether the current CSS-T is a cell-level search space or a BWP-level search space;
(2) BWP ID List: for the BWP level search space, the current CSS-T carries the scheduling information for the MBMS on the respective BWPs indicated in the list.
According to the configuration information of the control resource set and the configuration information of the search space, one control resource set and any search space thereon jointly define the BWP where the search space is located, the position of each PDCCH opportunity included in each monitoring period in the search space, the set of CCE resources that can be used in each PDCCH opportunity, and the starting position of each candidate PDCCH on the set at different aggregation levels. The method comprises the following specific steps:
for each CSS-T, the frame number n corresponding to the first PDCCH opportunity in each PDCCH monitoring periodfAnd time slot number
Figure BDA0002429626350000151
Determined according to the following formula:
Figure BDA0002429626350000152
wherein the content of the first and second substances,
Figure BDA0002429626350000153
a number of slots included in one radio frame when a Sub-Carrier Spacing (SCS) parameter of the PDCCH is μ is represented.
Numbering each PDCCH occasion in one PDCCH monitoring period according to the time sequence from the first PDCCH occasion in the PDCCH monitoring period, wherein the total number is TsEach time, the time number is from 0 to Ts-1。
For CSS-T with index s mapped to CORESET-T with index p, CCE indexes occupied by candidate PDCCHs at each aggregation level are defined as follows:
Figure BDA0002429626350000154
wherein, L is polymerization grade, i is 0, …, L-1, NCCE,pIs the total number of CCEs in CORESET-T with subscript p, and the subscript of the CCEs in CORESET-T ranges from 0 to NCCE,p-1；msIs a subscript of a PDCCH candidate of aggregation level L,
Figure BDA0002429626350000155
Figure BDA0002429626350000156
is the number of candidate PDCCHs of aggregation level L in CSS-T.
In addition, it should be noted that the relationship between CSS-T and CORESET-T corresponding to the PDCCH carrying MBMS scheduling information and the search space and CORESET existing in the NR cell defined in the 3GPP protocol is as follows:
in general, the common search space configured in the NR cell may include TYPE 0 CSS, TYPE 0A CSS, TYPE 1 CSS, TYPE 2 CSS, and TYPE 3 CSS. The TYPE 0 CSS may be mapped to CORESET 0, and the other CSSs may be mapped to CORESET 0 or to other CORESETs.
In the application, the CORESET-T and the CORESET 0 can share the same time-frequency resource. When the CORESET-T shares the same time-frequency resources with CORESET 0, the mapping of CSS-T to CORESET-T is equivalent to the mapping to CORESET 0. Under different multiplexing modes of the SS/PBCH Block and the CORESET, the PDCCH timing on the CORESET 0 is defined in chapter 13 of the 3GPP protocol TS 38.213, and details thereof are not repeated. The PDCCH opportunity cycle on CORESET 0 corresponds to K SS/PBCH blocks: a SS/PBCH Block with subscript 0 to subscript (K-1). And the wave beam adopted during PDCCH transmission on each PDCCH opportunity is the same as the wave beam adopted by the corresponding SS/PBCH Block.
In this application, for the CSS-T mapped to CORESET 0, the definition of the PDCCH timing on the CSS-T follows the existing definition of the PDCCH timing on CORESET 0, and is not described herein again.
When other types of common search spaces are mapped to the CORESET other than CORESET 0, the CORESET-T in the application can share the same time-frequency resources with the CORESET corresponding to the other types of common search spaces. In this scenario, the CSS-T mapped to CORESET-T is equivalent to mapping to CORESET corresponding to other types of common search spaces, and the corresponding CORESET only uses one set of configuration parameters, which is applicable to all common search spaces mapped to the CORESET at the same time. However, each common search space mapped to the CORESET has a corresponding set of configuration parameters, and the set of parameters used in each common search space may be the same or different. Each common search space uses the same set of parameters as those included in the configuration information of the above-described CSS-T.
When CSS-T is mapped onto CORESET 0, the application proposes: whether the CSS-T of the current cell is mapped to CORESET 0 is indicated with 1 bit on PBCH. When the bit is 1, CSS-T is mapped to CORESET 0; when the bit is 0, CSS-T is not mapped to CORESET 0.
In order to enable the UE to receive the PDCCH carrying the MBMS scheduling information, it is necessary to broadcast the configuration information of each control resource set configured for the PDCCH carrying the MBMS scheduling information and the configuration information of each search space configured on each control resource set in the current NR cell through the SIB1 or the newly added SIB. When the configuration information is broadcasted by adopting the newly added SIB, the newly added SIB can be sent as required.
S202: for one MBMS, determining a search space corresponding to a PDCCH carrying scheduling information of the MBMS according to the BWP in which the MBMS is located. When the MBMS corresponds to more than one search space, it is tried to allocate CCE resources to the PDCCH carrying scheduling information thereof in each search space in turn. When CCE resources are successfully allocated to the PDCCH in one search space, subsequent processing is performed. When CCE resources cannot be successfully allocated to the PDCCH in all search spaces, the process is ended.
Specifically, for an MBMS, the respective CSS-ts carrying the MBMS scheduling information are determined according to the BWP in which the MBMS is located, the configuration information of the respective CORESET-ts defined in step S201, and the configuration information of the respective CSS-ts on the respective CORESET-ts. In these CSS-ts, an attempt is made in turn to allocate CCE resources to the PDCCH carrying the current MBMS scheduling information.
CCE resources are allocated to PDCCHs carrying MBMS scheduling information within one search space in the following manner.
For PDSCH carrying MBMS, for each PDSCH transmission, allocating K PDSCH occasions to the PDSCH, and determining the positions of the corresponding K PDCCH occasions according to the positions of the PDSCH occasions. The kth PDCCH occasion is used to carry scheduling information of the kth PDSCH occasion. K1. K is the number of beams adopted by the SS/PBCH block in the current NR cell. Typical values for K include: 16 and 64.
Within the search space, a state of each PDCCH occasion is determined among the respective PDCCH occasions included in each monitoring period. When a PDCCH occasion is allocated to a PDCCH, the occasion state is "occupied", otherwise the occasion state is "idle". And determining whether the K PDCCH occasions are idle in a search space. And if the search space is idle, allocating the K PDCCH occasions to the PDCCH in the search space. After K PDCCH occasions are allocated for the PDCCH, CCE resources are further allocated to the PDCCH within each PDCCH occasion. When CCE resources are successfully allocated to the PDCCHs in each PDCCH time machine, CCE resources are successfully allocated to the PDCCHs in the search space. When the CCE resource allocation for PDCCH in the search space is successful, the states of K PDCCH occasions allocated to PDCCH are updated to 'occupied', and the PDCCH occasions can not be allocated to other PDCCHs.
For PDSCH carrying MBMS, each PDSCH sending occupies K PDSCH occasions, and PDCCH carrying PDSCH scheduling information in K PDSCH occasions occupies K PDCCH occasions. The K PDCCH occasions and the K PDSCH occasions satisfy a timing relationship between the PDCCH and the PDSCH. The SCS parameters corresponding to the PDCCH and the PDSCH are respectively set as follows: mu.sPDSCHAnd muPDCCHIf according to μPDCCHWhen PDCCH carrying PDSCH scheduling information is transmitted in time slot n, according to muPDSCHThe corresponding PDSCH is transmitted in the following time slot p:
Figure BDA0002429626350000171
wherein, K0Parameters in time domain resource allocation information for PDSCH transmitted in time slot p, the parameters being used for determiningThe timing difference between the PDCCH and the PDSCH carrying the scheduling information is defined.
According to the formula, for each PDSCH transmission, the time slot positions of K PDSCH occasions allocated to PDSCH and the parameter K in PDSCH time domain resource allocation in each PDSCH occasion0The slot positions for the K PDCCH occasions may be determined. After determining the locations of the K PDCCH occasions, the PDCCH may be allocated the K PDCCH occasions in the corresponding search spaces. And when the K PDCCH occasions in the corresponding search space are all idle, allocating the K idle PDCCH occasions to the PDCCH, and continuously allocating CCE resources for the PDCCH in each idle PDCCH occasion. When the CCE resource allocation is successful in each occasion, the states of the K idle PDCCH occasions allocated to the PDCCH are updated to be occupied.
S203: and on the BWP where the search space is located, in the search space, respectively transmitting PDCCHs scrambled by G-RNTIs for CRC in the allocated K PDCCH occasions by using the allocated CCE resources, wherein the DCI format on the PDCCH transmitted in each PDCCH occasion is the scheduling information of the PDSCH in the corresponding PDSCH time machine. Wherein, the beam used when the PDCCH is transmitted at the kth PDCCH occasion is the beam used when the PDSCH is transmitted at the kth PDSCH occasion. Before a PDCCH is transmitted at each PDCCH occasion, corresponding processing needs to be performed on the PDCCH and DMRSs of the PDCCH.
Specifically, K beams are respectively adopted in K PDCCH occasions to transmit PDCCH scrambled by G-RNTI for CRC, DCI format carried on PDCCH is MBMS scheduling information of corresponding PDSCH occasion, and preferably, DCI format may adopt 1-0. The K wave beams adopted in the K PDCCH time frames are the same as the K wave beams adopted by the SS/PBCH block, and the sequence of the wave beams adopted in the K PDCCH time frames is the same as the sequence of the wave beams adopted in the corresponding K PDSCH time frames for transmitting the PDSCH.
Before each PDCCH occasion transmits the PDCCH, the corresponding processing of the PDCCH and the DMRS of the PDCCH comprises the following steps:
the processing procedure of the PDCCH carrying the MBMS scheduling information in the physical layer is the same as the processing procedure of the PDCCH carrying the scheduling information of the general service (e.g., voice service) in the physical layer. Specifically, the processing of the DCI format on the PDCCH by the physical layer includes: bit scrambling, modulation and physical resource mapping. The process of generating DMRS (demodulation reference signal) of PDCCH carrying MBMS scheduling information is the same as that of PDCCH carrying general service scheduling information, and the process includes: DMRS sequences are generated and mapped to physical resources.
Optionally, because the MBMS scheduling information needs to be broadcast to the UEs in the cell through the PDCCH, in order to enable the UEs in the cell to decode the PDCCH, the DCI format on the PDCCH may be processed in the following manner: and bit scrambling, modulating and physical resource mapping are sequentially carried out on the DCI format of the PDCCH.
Specifically, when bit scrambling is performed on a DCI format on a PDCCH, a pseudo-random sequence generator is initialized according to the following formula, and parameters in the following formula need to be configured according to values determined by the present application or according to a method provided by the present application:
c1-init＝(nRNTI·216+nID)mod 231
wherein n isIDScrambling ID, n for PDCCHRNTIRNTI adopted for the UE as the receiving side.
In the present application, nIDConfigured in one of the following ways:
the first method is as follows:
Figure BDA0002429626350000191
Figure BDA0002429626350000192
a physical layer cell ID of a cell;
the second method comprises the following steps: in 3GPP protocol, a fixed value is configured for PDCCH carrying MBMS scheduling information in NR cell as PDCCH scrambling ID, preferably nID＝0。
Preferably, the first method is adopted.
In the present application, a PDCCH carrying MBMS scheduling information is broadcast in a cell, and there is no specific receiver UERNTI：
The method I comprises the following steps: n isRNTI＝0；
Mode two: setting nRNTIThe value of (a) is G-RNTI (radio network temporary identifier), the G-RNTI is used for identifying the current MBMS service at an air interface, and in the application, n is setRNTIThe value of (2) is a PDCCH (physical downlink control channel) which is used for bearing MBMS scheduling information at an air interface identifier by using the G-RNTI.
In the DMRS generation process of the PDCCH, the pseudo-random sequence generator is initialized by the following formula, and the parameters in the following formula are set by using the values determined by the present application or according to the method given by the present application:
Figure BDA0002429626350000193
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002429626350000194
for the number of symbols included in one slot,
Figure BDA0002429626350000195
index of time slot in a radio frame when SCS parameter of NR cell is mu, l is index of symbol in a time slot, NIDE {0, 1., 65535} is the scrambling ID of the DMRS (Demodulation Reference Signal) of the PDCCH, and N can be determined in one of the following waysIDThe value of (A) is as follows:
the method I comprises the following steps:
Figure BDA0002429626350000196
the second method comprises the following steps: giving N in 3GPP protocolIDAssigning a fixed value, preferably NID＝0。
In the sending method of scheduling information of a multimedia broadcast multicast service provided in this embodiment, first, a control resource set is configured for a PDCCH carrying MBMS scheduling information, and each search space is configured on each configured control resource set, where each search space may be a cell-level search space and is used to carry scheduling information of each MBMS in a cell; each search space may also be a BWP level search space for carrying scheduling information for MBMS on one or more BWPs.
For an MBMS, determining a search space corresponding to a PDCCH bearing scheduling information of the MBMS, trying to allocate PDCCH opportunities to the PDCCH bearing the scheduling information of the MBMS in each corresponding search space in sequence, and allocating CCE resources to the PDCCH in each allocated PDCCH opportunity. And after CCE resources are successfully allocated to the PDCCH carrying the scheduling information in a search space, the PDCCH scrambled by the G-RNTI for the CRC is transmitted by adopting the allocated CCE resources at the allocated PDCCH opportunity, wherein the G-RNTI is the G-RNTI of the MBMS. And the wave beam adopted when the PDCCH is transmitted in the PDCCH opportunity is the wave beam adopted when the PDSCH is transmitted in the corresponding PDSCH machine. Processing is performed on the PDCCH before the PDCCH is transmitted through the PDCCH occasion, and the DCI format is scheduling information of the MBMS. Preferably, the DCI format is DCI format 1-0. Performing processing on the PDCCH includes; processing is performed on DCI formats on PDCCH and processing is performed on PDCCH DMRS.
The method provided by the embodiment can realize the MBMS scheduling information broadcast in the NR cell.
The embodiment of the invention also provides a device for sending the multimedia broadcast multicast service scheduling information, and the device is explained below.
Fig. 3 is a schematic structural diagram of a device for sending mbms scheduling information according to an embodiment of the present invention. Referring to fig. 3, the apparatus 10 for transmitting mbms scheduling information may include a configuration module 11, an assignment module 12 and a transmission module 13, wherein,
the configuration module 11 is configured to configure each control resource set and each search space corresponding to a physical downlink control channel PDCCH, where the PDCCH is used to carry scheduling information of a multimedia broadcast multicast service MBMS;
the allocation module 12 is configured to determine, for an MBMS, each search space corresponding to a PDCCH carrying scheduling information of the MBMS according to a BWP in which the MBMS is located, and attempt to allocate a PDCCH opportunity and a Control Channel Element (CCE) resource to the PDCCH carrying the scheduling information of the MBMS in each search space in sequence;
the sending module 13 is configured to, after a PDCCH opportunity and CCE resources are successfully allocated to the PDCCH in one search space, send, on the BWP where the search space is located, the PDCCH scrambled by the group radio network temporary identifier G-RNTI for cyclic redundancy check CRC in each allocated PDCCH opportunity by using the allocated CCE resources in the search space, where the DCI format on the PDCCH sent in each PDCCH opportunity is to carry scheduling information of the PDSCH of the MBMS in the corresponding PDSCH opportunity of the physical downlink shared channel; the G-RNTI is used for identifying the MBMS.
The sending apparatus for scheduling information of a multimedia broadcast multicast service according to the embodiment of the present invention may implement the technical solution of the method embodiment shown in fig. 2, and its implementation principle and beneficial effects are similar, which are not described herein again.
In a possible implementation, the configuration module 11 is specifically configured to:
configuring each control resource set corresponding to the PDCCH in the new wireless NR cell;
configuring each search space for each configured control resource set; the search space is a search space mapped onto a set of control resources.
In one possible embodiment, the configured search space comprises a cell-level search space and/or a bandwidth slice BWP-level search space; the cell level search space is used for carrying scheduling information of each MBMS in the cell; the BWP level search space is used to carry scheduling information for MBMS on one or more BWPs.
In a possible embodiment, the apparatus further comprises a broadcasting module 14;
the broadcast module is configured to, after configuring each control resource set and each search space corresponding to the PDCCH, broadcast configuration information of each control resource set and configuration information of each search space mapped to the control resource set in the current NR cell through SIB1 or a newly added SIB; when the configuration information is broadcasted by adopting the newly added SIB, the newly added SIB can be sent as required.
In a possible implementation, the allocating module 12 is specifically configured to:
allocating K PDSCH occasions to a PDSCH for each transmission of a PDSCH (physical downlink shared channel) carrying an MBMS (multimedia broadcast multicast service), wherein the PDSCH is transmitted by adopting K beams in the K occasions respectively, K is the number of the beams adopted when an SS/PBCH block in a current NR (non-uniform resource locator) cell is transmitted, the K beams are the K beams adopted when the SS/PBCH block in the current NR cell is transmitted, and the positions of the corresponding K PDCCH occasions are determined according to the positions of the PDSCH occasions; the scheduling information of PDSCHs carrying MBMS in the machine is carried by K PDSCHs respectively at K PDCCH occasions;
determining the states of K PDCCH occasions in a search space;
and if the state of each PDCCH opportunity is an idle state, allocating K PDCCH opportunities to the PDCCH in the search space, and respectively allocating CCE resources to the PDCCH in the K PDCCH opportunities.
In a possible implementation manner, the sending module 13 is specifically configured to:
respectively adopting K wave beams to send the PDCCH in K PDCCH (physical Downlink control channel) machines, adopting the wave beams adopted when the PDSCH in a kth PDSCH machine is used for sending the PDCCH in the kth PDCCH machine, wherein the DCI format on the PDCCH in the kth PDCCH machine is the scheduling information of the PDSCH in the kth PDSCH machine; k is 1, … …, K;
and performing corresponding processing on the PDCCH and the DMRS of the PDCCH before the PDCCH is transmitted at each PDCCH occasion.
In a possible implementation manner, the sending module 13 is specifically configured to:
performing bit scrambling, modulation and physical resource mapping processing on the PDCCH; wherein, when performing bit scrambling, the pseudo-random sequence generator is initialized by:
c1-init＝(nRNTI·216+nID)mod 231
wherein n isIDFor PDCCH scrambling ID, n is configured according to a preset modeID；nRNTISetting n for RNTI adopted by UE as a receiving party according to a preset modeRNTI；
Performing corresponding processing on the DMRS of the PDCCH, including:
generating a DMRS sequence of the PDCCH and mapping to physical resources; when the DMRS sequence is generated, the pseudo-random sequence generator is initialized according to the following formula:
Figure BDA0002429626350000221
wherein the content of the first and second substances,
Figure BDA0002429626350000222
for the number of symbols included in one slot,
Figure BDA0002429626350000223
index of time slot in a radio frame when SCS parameter of NR cell is mu, l is index of symbol in a time slot, NIDE {0, 1.. 65535} is scrambling ID of DMRS of PDCCH, and N is determined according to a preset modeIDThe value of (c).
The sending apparatus for scheduling information of a multimedia broadcast multicast service according to the embodiment of the present invention may implement the technical solution of the method embodiment shown in fig. 2, and its implementation principle and beneficial effects are similar, which are not described herein again.
The embodiment of the present invention further provides a schematic diagram of a hardware structure of a sending apparatus for scheduling information of a multimedia broadcast multicast service, please refer to fig. 4. The apparatus 20 for transmitting mbms scheduling information includes: at least one processor 21 and a memory 22. The processor 21 and the memory 22 are connected by a bus 23.
In a specific implementation, the at least one processor 21 executes computer-executable instructions stored in the memory 22, so that the at least one processor 21 executes the method for transmitting the mbms scheduling information as described above.
For a specific implementation process of the processor 21, reference may be made to the above method embodiments, which implement similar principles and technical effects, and this embodiment is not described herein again.
The transmitting apparatus of the scheduling information of the mbms service shown in fig. 4 is only an example, and should not bring any limitation to the function and the scope of the embodiments of the present disclosure.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer executable instruction is stored in the computer-readable storage medium, and when a processor executes the computer executable instruction, the method for sending scheduling information of a multimedia broadcast multicast service according to any of the above-mentioned method embodiments is implemented.
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 for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand 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 such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (14)

1. A method for sending scheduling information of Multimedia Broadcast Multicast Service (MBMS) is characterized by comprising the following steps:
configuring each control resource set and each search space corresponding to a Physical Downlink Control Channel (PDCCH), wherein the PDCCH is used for bearing Multimedia Broadcast Multicast Service (MBMS) scheduling information;
for an MBMS, determining each search space corresponding to a PDCCH carrying scheduling information of the MBMS according to BWP in which the MBMS is located, and trying to allocate PDCCH opportunity and Control Channel Element (CCE) resources to the PDCCH carrying the scheduling information of the MBMS in each search space in sequence;
after PDCCH occasions and CCE resources are successfully allocated to the PDCCH in a search space, on BWP where the search space is located, the PDCCH scrambled by a group radio network temporary identifier G-RNTI for Cyclic Redundancy Check (CRC) is respectively transmitted in each allocated PDCCH occasion in the search space by adopting the allocated CCE resources, and the DCI format on the PDCCH transmitted in each PDCCH occasion is that scheduling information of a PDSCH of the MBMS is carried in the corresponding PDSCH occasion of a Physical Downlink Shared Channel (PDSCH); the G-RNTI is used for identifying the MBMS;
for an MBMS, determining each search space corresponding to a PDCCH carrying scheduling information of the MBMS according to BWP in which the MBMS is located, and trying to allocate PDCCH opportunities and CCE resources to the PDCCH carrying the scheduling information of the MBMS in each search space in turn, wherein the search spaces comprise:
allocating K PDSCH occasions to a PDSCH for each transmission of a physical downlink shared channel PDSCH carrying the MBMS, wherein the PDSCH is transmitted by adopting K wave beams in the K occasions respectively, the K is the number of the wave beams adopted when an SS/PBCH block in a current NR cell is transmitted, the K wave beams are the K wave beams adopted when the SS/PBCH block in the current NR cell is transmitted, and the positions of the corresponding K PDCCH occasions are determined according to the positions of the PDSCH occasions; the K PDCCH occasions respectively bear scheduling information of the PDSCH bearing the MBMS in the K PDSCH occasions;
determining states of the K PDCCH occasions in the search space;
and if the state of each PDCCH opportunity is an idle state, allocating the K PDCCH opportunities to the PDCCH in the search space, and allocating CCE resources to the PDCCH in the K PDCCH opportunities respectively.
2. The method of claim 1, wherein configuring each control resource set and each search space corresponding to a PDCCH comprises:
configuring each control resource set corresponding to the PDCCH in the new wireless NR cell;
configuring each search space for each configured control resource set; the search space is a search space mapped onto the set of control resources.
3. The method according to claim 1 or 2, wherein the configured search space comprises a cell-level search space and/or a bandwidth slice BWP-level search space; the cell level search space is used for carrying scheduling information of each MBMS in a cell; the BWP-level search space is used to carry scheduling information for MBMS on one or more BWPs.
4. The method according to claim 1 or 2, further comprising, after configuring each control resource set and each search space corresponding to the PDCCH:
broadcasting the configuration information of each control resource set and the configuration information of each search space mapped to the control resource set in the current NR cell through SIB1 or a newly added SIB; when the configuration information is broadcasted by adopting the newly added SIB, the newly added SIB can be sent as required.
5. The method according to claim 1 or 2, wherein after a PDCCH occasion and CCE resources are successfully allocated to the PDCCH in one search space, on the BWP where the search space is located, in each allocated PDCCH occasion, the PDCCH scrambled with the group radio network temporary identifier G-RNTI for cyclic redundancy check CRC is transmitted using the allocated CCE resources in the search space, and the DCI format on the PDCCH transmitted in each PDCCH occasion is such that the scheduling information of the PDSCH of the MBMS is carried in the corresponding PDSCH occasion, the method comprising:
respectively adopting K wave beams to send the PDCCH in K PDCCH (physical Downlink control channel) machines, adopting the wave beams adopted by the PDSCH in a kth PDSCH machine to send the PDCCH in the kth PDCCH machine, wherein the DCI format on the PDCCH in the kth PDCCH machine is the scheduling information of the PDSCH in the kth PDSCH machine; k is 1, … …, K;
and performing corresponding processing on the PDCCH and demodulation reference signals (DMRSs) of the PDCCH before the PDCCH is transmitted at each PDCCH occasion.
6. The method of claim 5, wherein performing the corresponding processing on the PDCCH comprises:
performing bit scrambling, modulation and physical resource mapping processing on the PDCCH; wherein, when performing bit scrambling, the pseudo-random sequence generator is initialized by:
c1-init＝(nRNTI·216+nID)mod231
wherein n isIDFor PDCCH scrambling ID, n is configured according to a preset modeID；nRNTISetting n for RNTI adopted by UE as a receiving party according to a preset modeRNTI；
Performing corresponding processing on the DMRS of the PDCCH, including:
generating a DMRS sequence of the PDCCH and mapping to a physical resource; when the DMRS sequence is generated, the pseudo-random sequence generator is initialized according to the following formula:
Figure FDA0003638862570000031
wherein the content of the first and second substances,
Figure FDA0003638862570000032
for the number of symbols included in one slot,
Figure FDA0003638862570000033
index of time slot in a radio frame when SCS parameter of NR cell is mu, l is index of symbol in a time slot, NIDE {0, 1.. 65535} is scrambling ID of DMRS of PDCCH, and N is determined according to a preset modeIDThe value of (c).
7. A device for transmitting mbms scheduling information, comprising:
the device comprises a configuration module, a search module and a resource allocation module, wherein the configuration module is used for configuring each control resource set and each search space corresponding to a Physical Downlink Control Channel (PDCCH), and the PDCCH is used for bearing Multimedia Broadcast Multicast Service (MBMS) scheduling information;
the system comprises an allocation module and a Control Channel Element (CCE) module, wherein the allocation module is used for determining each search space corresponding to a PDCCH carrying scheduling information of an MBMS according to a BWP in which the MBMS is positioned, and trying to allocate PDCCH opportunity and Control Channel Element (CCE) resources to the PDCCH carrying the scheduling information of the MBMS in each search space in turn;
a sending module, configured to send, on BWP where a search space is located, PDCCHs scrambled with a group radio network temporary identifier G-RNTI for cyclic redundancy check CRC in each allocated PDCCH occasion by using the allocated CCE resource in the search space after PDCCH occasions and CCE resources are successfully allocated for the PDCCHs in the search space, where a DCI format on a PDCCH sent in each PDCCH occasion is a scheduling information of a PDSCH of the MBMS carried in a corresponding PDSCH occasion of a physical downlink shared channel; the G-RNTI is used for identifying the MBMS;
the allocation module is specifically configured to allocate, for each transmission of a PDSCH of a physical downlink shared channel carrying the MBMS, K PDSCH occasions to the PDSCH, where the PDSCH is transmitted using K beams within the K occasions, where the K is the number of beams used when the SS/PBCH block in the current NR cell is transmitted, and the K beams are the K beams used when the SS/PBCH block in the current NR cell is transmitted, and determine the positions of the corresponding K PDCCH occasions according to the positions of the PDSCH occasions; the K PDCCH occasions respectively bear scheduling information of the PDSCH bearing the MBMS in the K PDSCH occasions; determining states of the K PDCCH occasions in the search space; and if the state of each PDCCH opportunity is an idle state, allocating the K PDCCH opportunities to the PDCCH in the search space, and allocating CCE resources to the PDCCH in the K PDCCH opportunities respectively.
8. The apparatus of claim 7, wherein the configuration module is specifically configured to:
configuring each control resource set corresponding to the PDCCH in the new wireless NR cell;
configuring each search space for each configured control resource set; the search space is a search space mapped onto the set of control resources.
9. The apparatus according to claim 7 or 8, wherein the configured search space comprises a cell-level search space and/or a bandwidth slice BWP-level search space; the cell level search space is used for carrying scheduling information of each MBMS in a cell; the BWP level search space is used to carry scheduling information for MBMS on one or more BWPs.
10. The apparatus of claim 7 or 8, further comprising a broadcasting module;
the broadcast module is configured to, after configuring each control resource set and each search space corresponding to the PDCCH, broadcast configuration information of each control resource set and configuration information of each search space mapped to the control resource set in the current NR cell through SIB1 or a newly added SIB; when the configuration information is broadcasted by adopting the newly added SIB, the newly added SIB can be transmitted as required.
11. The apparatus according to claim 7 or 8, wherein the sending module is specifically configured to:
respectively adopting K wave beams to send the PDCCH in K PDCCH (physical Downlink control channel) machines, adopting the wave beams adopted by the PDSCH in a kth PDSCH machine to send the PDCCH in the kth PDCCH machine, wherein the DCI format on the PDCCH in the kth PDCCH machine is the scheduling information of the PDSCH in the kth PDSCH machine; k is 1, … …, K;
and performing corresponding processing on the PDCCH and the DMRS of the PDCCH before the PDCCH is transmitted at each PDCCH occasion.
12. The apparatus of claim 11, wherein the sending module is specifically configured to:
performing bit scrambling, modulation and physical resource mapping processing on the PDCCH; wherein, when performing bit scrambling, the pseudo-random sequence generator is initialized by:
c1-init＝(nRNTI·216+nID)mod231
wherein n isIDScrambling ID for PDCCH, configuring n according to preset modeID；nRNTISetting n for RNTI adopted by UE as a receiving party according to a preset modeRNTI；
Performing corresponding processing on the DMRS of the PDCCH, including:
generating a DMRS sequence of the PDCCH and mapping to a physical resource; when the DMRS sequence is generated, the pseudo-random sequence generator is initialized according to the following formula:
Figure FDA0003638862570000051
wherein the content of the first and second substances,
Figure FDA0003638862570000052
for the number of symbols included in one slot,
Figure FDA0003638862570000053
index of time slot in a radio frame when SCS parameter of NR cell is mu, l is index of symbol in a time slot, NIDE {0, 1.. 65535} is scrambling ID of DMRS of PDCCH, and N is determined according to a preset modeIDThe value of (c).
13. A device for transmitting mbms scheduling information, comprising: at least one processor and memory;
the memory is used for storing computer execution instructions;
the at least one processor is configured to execute the computer-executable instructions stored by the memory to cause the at least one processor to perform the method of multimedia broadcast multicast service scheduling information transmission according to any of claims 1-6.
14. A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, which when executed by a processor, implement the method for scheduling information of mbms according to any one of claims 1 to 6.
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