CN113678500B

CN113678500B - Feedback resource allocation method, communication method, device and communication equipment

Info

Publication number: CN113678500B
Application number: CN201980095029.3A
Authority: CN
Inventors: 王淑坤; 徐伟杰; 卢前溪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2024-03-01
Anticipated expiration: 2039-09-23
Also published as: CN113678500A; WO2021056155A1

Abstract

The embodiment of the application provides a feedback resource configuration method, a communication method, a device and a communication device, wherein the method comprises the following steps: the network equipment sends first configuration information, wherein the first configuration information is used for determining first feedback resources corresponding to a Multimedia Broadcast Multicast Service (MBMS); the first feedback resource is used for the terminal equipment to send negative acknowledgement NACK information for the MBMS service.

Description

Feedback resource allocation method, communication method, device and communication equipment

Technical Field

The embodiment of the application relates to the technical field of mobile communication, in particular to a feedback resource allocation method, a communication method, a device and communication equipment.

Background

Multimedia broadcast multicast service (Multimedia Broadcast Multicast Service, MBMS) is a technology for transmitting data from one data source to a plurality of users through a shared network resource, which can effectively utilize the network resource while providing multimedia services, and realize broadcasting and multicasting of multimedia services at a higher rate (e.g., 256 kbps).

In a New Radio (NR) system, many scenarios need to support the service requirements of multicasting and broadcasting, such as in the internet of vehicles, industrial internet, etc. It is necessary to introduce MBMS in the NR. In NR, the unicast scenario of the connection state is with hybrid automatic repeat reQuest (HARQ) feedback. The feedback mechanism is not introduced for the MBMS scene in NR, namely the terminal equipment receives the MBMS without feedback, and the transmission reliability of the MBMS cannot be ensured.

Disclosure of Invention

The embodiment of the application provides a feedback resource configuration method, a communication method, a device and communication equipment.

The feedback resource configuration method provided by the embodiment of the application comprises the following steps:

the network equipment sends first configuration information, wherein the first configuration information is used for determining first feedback resources corresponding to the MBMS; the first feedback resource is configured to receive Negative Acknowledgement (NACK) information sent by a terminal device for the MBMS service.

the network equipment sends first configuration information, wherein the first configuration information is used for determining a plurality of feedback resources corresponding to the MBMS, and the plurality of feedback resources are used for a plurality of terminal equipment to send feedback information aiming at the MBMS.

The communication method provided by the embodiment of the application comprises the following steps:

the terminal equipment receives first configuration information, wherein the first configuration information is used for determining first feedback resources corresponding to the MBMS;

and the terminal equipment sends NACK information on the first feedback resource.

the method comprises the steps that terminal equipment receives first configuration information, wherein the first configuration information is used for determining a plurality of feedback resources corresponding to an MBMS;

And the terminal equipment determines a first feedback resource from the plurality of feedback resources and sends feedback information on the first feedback resource.

The feedback resource configuration device provided by the embodiment of the application comprises:

a sending unit, configured to send first configuration information, where the first configuration information is used to determine a first feedback resource corresponding to an MBMS service; the first feedback resource is used for the terminal equipment to send NACK information for the MBMS service.

the terminal equipment comprises a sending unit, a receiving unit and a sending unit, wherein the sending unit is used for sending first configuration information, the first configuration information is used for determining a plurality of feedback resources corresponding to the MBMS, and the feedback resources are used for sending feedback information aiming at the MBMS by a plurality of terminal equipment.

The communication device provided in the embodiment of the application includes:

the receiving unit is used for receiving first configuration information, wherein the first configuration information is used for determining a first feedback resource corresponding to the MBMS;

and the feedback unit is used for sending NACK information on the first feedback resource.

the receiving unit is used for receiving first configuration information, wherein the first configuration information is used for determining a plurality of feedback resources corresponding to the MBMS;

And the feedback unit is used for determining a first feedback resource from the plurality of feedback resources and sending feedback information on the first feedback resource.

The communication device provided by the embodiment of the application comprises a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the feedback resource allocation method or the communication method.

The chip provided by the embodiment of the application is used for realizing the feedback resource allocation method or the communication method.

Specifically, the chip includes: and a processor for calling and running the computer program from the memory, so that the device mounted with the chip executes the feedback resource allocation method or the communication method.

The computer readable storage medium provided in the embodiments of the present application is configured to store a computer program, where the computer program causes a computer to execute the feedback resource allocation method or the communication method described above.

The computer program product provided by the embodiment of the application comprises computer program instructions, wherein the computer program instructions enable a computer to execute the feedback resource allocation method or the communication method.

The computer program provided in the embodiments of the present application, when executed on a computer, causes the computer to execute the feedback resource allocation method or the communication method described above.

Through the technical scheme, the broadcasting and multicasting of the MBMS are supported in the NR system, and meanwhile, a scheme is provided, namely NACK feedback of one terminal device is supported through configuration of the first feedback resource. Alternatively, multiple terminal devices may be configured to support independent NACK feedback or ACK feedback by configuring multiple feedback resources. Further, retransmission of service data is performed based on feedback information of the MBMS service, so that reliability of service data transmission is guaranteed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

fig. 1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a first SIB related configuration provided in an embodiment of the present application;

fig. 3 is a schematic diagram of a PTM configuration transmission mechanism provided in an embodiment of the present application;

fig. 4 is a PTM channel and a map thereof provided in an embodiment of the present application;

fig. 5 is a flowchart of a feedback resource allocation method according to an embodiment of the present application;

fig. 6 is a second flowchart of a feedback resource allocation method according to an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a feedback resource allocation apparatus according to an embodiment of the present application;

fig. 8 is a schematic diagram ii of the structural composition of the feedback resource allocation apparatus provided in the embodiment of the present application;

fig. 9 is a schematic diagram of the structural composition of a communication device according to an embodiment of the present application;

fig. 10 is a schematic diagram of a second structural component of the communication device according to the embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

FIG. 12 is a schematic block diagram of a chip of an embodiment of the present application;

fig. 13 is a schematic block diagram of a communication system provided in an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: long term evolution (Long Term Evolution, LTE) systems, LTE frequency division duplex (Frequency Division Duplex, FDD) systems, LTE time division duplex (Time Division Duplex, TDD), systems, 5G communication systems, future communication systems, or the like.

Exemplary, a communication system 100 to which embodiments of the present application apply is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal 120 (or referred to as a communication terminal, terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminals located within the coverage area. Alternatively, the network device 110 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in the LTE system, or a radio controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle device, a wearable device, a hub, a switch, a bridge, a router, a network-side device in a 5G network, or a network device in a future communication system, etc.

The communication system 100 further includes at least one terminal 120 located within the coverage area of the network device 110. "terminal" as used herein includes, but is not limited to, connection via wireline, such as via public-switched telephone network (Public Switched Telephone Networks, PSTN), digital subscriber line (Digital Subscriber Line, DSL), digital cable, direct cable connection; and/or another data connection/network; and/or via a wireless interface, e.g., for a cellular network, a wireless local area network (Wireless Local Area Network, WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and/or means of the other terminal arranged to receive/transmit communication signals; and/or internet of things (Internet of Things, ioT) devices. Terminals arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals" or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellites or cellular telephones; a personal communications system (Personal Communications System, PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; a PDA that can include a radiotelephone, pager, internet/intranet access, web browser, organizer, calendar, and/or a global positioning system (Global Positioning System, GPS) receiver; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, personal digital assistant (Personal DigitalAssistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal in a 5G network or a terminal in a future evolved PLMN, etc.

Alternatively, direct to Device (D2D) communication may be performed between the terminals 120.

Alternatively, the 5G communication system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Fig. 1 illustrates one network device and two terminals, alternatively, the communication system 100 may include multiple network devices and each network device may include other numbers of terminals within a coverage area, which is not limited in this embodiment.

Optionally, the communication system 100 may further include a network controller, a mobility management entity, and other network entities, which are not limited in this embodiment of the present application.

It should be understood that a device having a communication function in a network/system in an embodiment of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal 120 with communication functions, where the network device 110 and the terminal 120 may be specific devices described above, and are not described herein again; the communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in this embodiment of the present application.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the following describes the technical solutions related to the embodiments of the present application.

With the pursuit of speed, delay, high speed mobility, energy efficiency and diversity and complexity of future life business, the third generation partnership project (3 ^rd Generation Partnership Project,3 GPP) international standards organization began developing 5G. The main application scenario of 5G is: enhanced mobile Ultra-wideband (enhanced Mobile Broadband, eMB B), low latency high reliability communication (URLLC), large scaleModular Machine-type communication (mctc).

On the one hand, embbs still target users to obtain multimedia content, services and data, and their demand is growing very rapidly. On the other hand, since an eMBB may be deployed in different scenarios, such as indoors, urban, rural, etc., its capabilities and requirements are also quite different, so that detailed analysis must be performed in connection with a specific deployment scenario, not in general. Typical applications of URLLC include: industrial automation, electric power automation, remote medical operation (surgery), traffic safety guarantee and the like. Typical characteristics of mctc include: high connection density, small data volume, delay insensitive traffic, low cost and long service life of the module, etc.

RRC state

5G for the purposes of reducing air interface signaling and fast recovery of radio connections, fast recovery of data traffic, a new radio resource control (Radio Resource Control, RRC) state, namely an RRC INACTIVE (RRC_INACTIVE) state, is defined. This state is different from the RRC IDLE (rrc_idle) state and the RRC ACTIVE (rrc_active) state. Wherein,

1) Rrc_idle state (simply referred to as IDLE state): mobility is UE-based cell selection reselection, paging is initiated by a Core Network (CN), and paging areas are configured by the CN. The base station side has no UE context and no RRC connection.

2) Rrc_connected state (CONNECTED state for short): there is an RRC connection and UE contexts on the base station side and UE side. The network side knows that the location of the UE is cell specific. Mobility is network-side controlled mobility. Unicast data may be transmitted between the UE and the base station.

3) Rrc_inactive state (simply referred to as INACTIVE state): mobility is cell selection reselection based on UE, there is a connection between CN-NRs, UE context exists on a certain base station, paging is triggered by RAN, paging area based on RAN is managed by RAN, network side knows UE location is based on paging area level of RAN.

MBMS

Multimedia broadcast multicast service (Multimedia Broadcast Multicast Service, MBMS), a technology for transmitting data from one data source to a plurality of UEs through a shared network resource, is introduced in 3GPP Release 6, R6, and is capable of effectively utilizing network resources while providing multimedia services, and realizing broadcasting and multicasting of multimedia services at a higher rate (e.g., 256 kbps).

Due to the low MBMS spectrum efficiency in 3gpp R6, it is not sufficient to effectively carry and support the operation of the mobile tv type service. In LTE, 3GPP has therefore explicitly proposed to enhance the support capability for the downlink high speed MBMS service and to determine the design requirements for the physical layer and the air interface.

The 3gpp r9 introduces evolved MBMS (eMBMS) into LTE. eMBMS proposes the concept of a single frequency network (Single Frequency Network, SFN), i.e. a multimedia broadcast multicast service single frequency network (Multimedia Broadcast multicast service Single Frequency Network, MBSFN), wherein the MBSFN uses a unified frequency to simultaneously transmit traffic data in all cells, but synchronization between the cells is guaranteed. The method can greatly improve the overall signal-to-noise ratio distribution of the cell, and the frequency spectrum efficiency can be correspondingly and greatly improved. eMBMS implements broadcast and multicast of services based on IP multicast protocols.

In LTE or LTE-Advanced (LTE-a), MBMS has only a broadcast bearer mode and no multicast bearer mode. In addition, the reception of the MBMS service is applicable to UEs in an idle state or a connected state.

A single cell point-to-multipoint (Single Cell Point To Multiploint, SC-PTM) concept is introduced in 3gpp r13, SC-PTM being based on the MBMS network architecture.

MBMS introduces new logical channels including Single Cell multicast control channel (SC-MCCH) and Single Cell multicast transport channel (SC-MTCH) and Single Cell-Multicast Transport Channel. The SC-MCCH and SC-MTCH are mapped onto a Downlink-Shared Channel (DL-SCH), and further, the DL-SCH is mapped onto a physical Downlink Shared Channel (Physical Downlink Shared Channel, PDSCH), wherein the SC-MCCH and SC-MTCH belong to a logical Channel, the DL-SCH belongs to a transport Channel, and the PDSCH belongs to a physical Channel. The SC-MCCH and SC-MTCH do not support hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) operation.

MBMS introduces a new system information block (System Information Block, SIB) type, SIB20. Specifically, the configuration information of the SC-MCCH is transmitted through the SIB20, and one cell has only one SC-MCCH. The configuration information of the SC-MCCH comprises: the modification period of the SC-MCCH, the repetition period of the SC-MCCH, the radio frame and subframe for scheduling the SC-MCCH and other information. Further, 1) the boundary of the modification period of the SC-MCCH satisfies SFN mod m=0, where SFN represents a system frame number of the boundary, and m is a modification period (i.e., SC-MCCH-modification period) of the SC-MCCH configured in SIB20. 2) The radio frame of the scheduling SC-MCCH meets the following conditions: SFN mod MCCH-repetition period = MCCH-Offset, where SFN represents the system frame number of the radio frame, MCCH-repetition period represents the repetition period of the SC-MCCH, and MCCH-Offset represents the Offset of the SC-MCCH. 3) The subframes of the scheduling SC-MCCH are indicated by SC-MCCH-Subframe.

The SC-MCCH is scheduled through a physical downlink control channel (Physical Downlink Control Channel, PDCCH). In one aspect, a new radio network temporary identity (Radio Network Tempory Identity, RNTI), i.e., single Cell RNTI (SC-RNTI), is introduced to identify a PDCCH (e.g., SC-MCCH PDCCH) for scheduling the SC-MCCH, optionally with the SC-RNTI fixed value FFFC. On the other hand, a new RNTI, i.e., a single cell notification RNTI (Single Cell Notification RNTI, SC-N-RNTI) is introduced to identify a PDCCH (e.g., notification PDCCH) for indicating a change notification of the SC-MCCH, optionally, the SC-N-RNTI is fixed to a value of FFFB; further, the change notification may be indicated with one bit of 8 bits (bits) of DCI 1C. In LTE, the configuration information of SC-PTM is based on the SC-MCCH configured by SIB20, and then SC-MCCH configures SC-MTCH for transmitting service data.

Specifically, the SC-MCCH transmits only one message (i.e., scptm configuration) for configuring configuration information of the SC-PTM. The configuration information of the SC-PTM comprises: temporary mobile Group identity (Temporary Mobile Group Identity, TMGI), session identity (session id), group RNTI (G-RNTI), discontinuous reception (Discontinuous Reception, DRX) configuration information, SC-PTM service information of neighbor cells, and the like. Note that SC-PTM in R13 does not support the robust header compression (Robust Header Compression, ROHC) function.

The downlink discontinuous reception of the SC-PTM is controlled by the following parameters: onDurationTimerSCPTM, drx-InactivityTimerSCPTM, SC-MTCH-scheduling cycle, and SC-MTCH-scheduling offset.

When [ (SFN 10) +subframe number ] module (SC-MTCH-scheduling cycle) =sc-MTCH-scheduling offset is satisfied, a timer ondurationtimerscpm is started;

when receiving downlink PDCCH scheduling, starting a timer drx-InactivityTimerSCPTM;

the downstream SC-PTM service is received only when the timer onduration timerscpm or drx-incaactyitimerscpm is running.

The SC-PTM service continuity adopts the MBMS service continuity concept based on SIB15, namely a mode of SIB15 and MBMSInterestindication. The traffic continuity of idle state UEs is based on the concept of frequency priority.

In NR, many scenarios require supporting the traffic demands of multicasting and broadcasting, such as in the internet of vehicles, industrial internet, etc. It is necessary to introduce MBMS in the NR.

In NR, the unicast scenario of the connection state is HARQ feedback present. The feedback mechanism is not introduced for the MBMS scene in NR, namely the terminal equipment receives the MBMS without feedback, the MBMS data loss is without remedial measures, and the transmission reliability of the MBMS cannot be ensured. For some of the NR scenarios, such as V2X, industrial network internet, etc., the requirements for reliability of multicast transmission are higher and higher, so introducing a feedback mechanism for MBMS to ensure reliability of service transmission (i.e. to ensure that all members in the multicast group receive service data) needs to be considered and introduced. For this reason, the following technical solutions of the embodiments of the present application are proposed. The technical scheme of the embodiment introduces HARQ feedback and repeated sending mechanism in the multicast, and ensures the reliability of the transmission of the service data in the group.

In the technical solution of the embodiment of the present application, a new SIB (referred to as a first SIB) is defined, referring to fig. 2, where the first SIB includes configuration information of a first MCCH, where the first MCCH is a control channel of an MBMS service, in other words, the first SIB is used to configure configuration information of a control channel of an NR MBMS, alternatively, the control channel of the NR MBMS may also be referred to as an NR MCCH (i.e. the first MCCH).

Further, the first MCCH is used to carry the first signaling, and in the embodiment of the present application, the name of the first signaling is not limited, for example, the first signaling is signaling a, where the first signaling includes configuration information of at least one first MTCH, where the first MTCH is a traffic channel (also referred to as a data channel or a transport channel) of an MBMS service, and the first MTCH is used to transport MBMS service data (such as service data of NR MBMS). In other words, the first MCCH is used to configure configuration information of a traffic channel of the NR MBMS, alternatively, the traffic channel of the NR MBMS may also be called as NR MTCH (i.e., the first MTCH).

Specifically, the first signaling is used for configuring a service channel of the NR MBMS, service information corresponding to the service channel, and scheduling information corresponding to the service channel. Further optionally, the service information corresponding to the service channel, for example, TMGI, session id, and other identification information for identifying the service. Scheduling information corresponding to the service channel, for example, RNTI used when MBMS service data corresponding to the service channel is scheduled, for example, G-RNTI, DRX configuration information, and the like.

The transmissions of the first MCCH and the first MTCH are scheduled based on the PDCCH. The RNTI used for scheduling the PDCCH of the first MCCH uses a unique network identifier, i.e. a fixed value. The RNTI used for scheduling PDCCH use of the first MTCH is configured through the first MCCH.

Further, at least one of the following is carried in the first MCCH: the first indication information is used for indicating whether the MBMS (corresponding to the TMGI and/or the session identifier) needs HARQ feedback or not; the second indication information is used for indicating the number of members in the multicast group corresponding to the MBMS; and the third indication information is used for indicating whether the terminal equipment needs to enter a connection state and then receive the MBMS. Here, when the terminal device registers to the MBMS service, the network device assigns a member index number to the terminal device registered to the MBMS service.

It should be noted that, in the embodiment of the present application, the naming of the first SIB, the first MCCH and the first MTCH is not limited. For convenience of description, the first SIB may also be simply referred to as SIB, the first MCCH may also be simply referred to as MCCH, and the first MTCH may also be simply referred to as MTCH, and referring to fig. 3, a PDCCH (i.e. MCCH PDCCH) for scheduling the MCCH and a notification PDCCH are configured through the SIB, where a PDSCH (i.e. MCCH PDSCH) for transmitting the MCCH is scheduled through DCI carried in MCCH PDCCH. Further, M PDCCHs for scheduling MTCH (i.e., MTCH 1PDCCH, MTCH 2PDCCH, MTCH M PDCCH) are configured through MCCH, wherein DCI carried by MTCH n PDCCH schedules PDSCH for transmitting MTCH n (i.e., MTCH n PDSCH), n is an integer greater than or equal to 1 and less than or equal to M. Referring to fig. 4, MCCH and MTCH are mapped onto DL-SCH, and further, DL-SCH is mapped onto PDSCH, wherein MCCH and MTCH belong to a logical channel, DL-SCH belongs to a transport channel, and PDSCH belongs to a physical channel.

Fig. 5 is a flowchart of a feedback resource allocation method provided in an embodiment of the present application, as shown in fig. 5, where the feedback resource allocation method includes the following steps:

step 501: the network equipment sends first configuration information, wherein the first configuration information is used for determining first feedback resources corresponding to the MBMS; the first feedback resource is used for the terminal equipment to send NACK information for the MBMS service.

In this embodiment of the present application, a network device sends first configuration information, a terminal device receives the first configuration information, and the terminal device sends NACK information on the first feedback resource. Further optionally, the network device may be a base station, e.g. a gNB.

In this embodiment of the present application, the first configuration information is carried in a first MCCH or a first SIB. Here, the first MCCH and the first SIB may be understood with reference to the foregoing related description. It should be noted that at least one of the following is also carried in the first MCCH: the first indication information is used for indicating whether the MBMS needs HARQ feedback or not; the second indication information is used for indicating the number of members in the multicast group corresponding to the MBMS; and the third indication information is used for indicating whether the terminal equipment needs to enter a connection state and then receiving the MBMS. Further, the network device allocates a member index number to the terminal device registered to the MBMS service.

In this embodiment of the present application, the first feedback resource is a PUCCH feedback resource for an MBMS service. It may also be understood that the first feedback resource is a PUCCH feedback resource corresponding to multicast.

In an optional embodiment of the application, the first configuration information is used to determine a first PUCCH resource set (PUCCH resource set), and the first PUCCH resource set is used to determine the first feedback resource.

For example: the first configuration information is used to determine a first index value, and the PUCCH feedback resource set associated with the first index value may be determined through a configuration list as shown in table 1 below.

TABLE 1

In another optional embodiment of the present application, the first configuration information is used to determine the first feedback resource.

In this embodiment of the present application, the first feedback resource is only used for feeding back NACK information, and ACK information is not fed back. It can be seen that, for a certain data, if the data is not received correctly (or is received completely), the terminal device sends NACK information on the first feedback resource; if the data is received correctly (or in other words, entirely), no feedback is required.

In an optional embodiment of the present application, if the network device receives NACK information on the first feedback resource, the network device retransmits a service data packet corresponding to the NACK information, where the service data packet is a data packet of the MBMS service. As can be seen, as long as the network device receives NACK information on the first feedback resource, it is indicated that there is a terminal device that does not correctly receive the service data packet, and the network device triggers HARQ retransmission; otherwise, if the network device does not receive the NACK information on the first feedback resource, it indicates that all the terminal devices correctly receive the service data packet, and the network device will not trigger HARQ retransmission.

The technical solution of the embodiment of the present application further provides a communication method, including: the terminal equipment receives first configuration information, wherein the first configuration information is used for determining first feedback resources corresponding to the MBMS; and the terminal equipment sends NACK information on the first feedback resource. It should be noted that the first feedback resource herein may be understood with reference to the foregoing related description.

Fig. 6 is a second flowchart of a feedback resource allocation method provided in the embodiment of the present application, as shown in fig. 6, where the feedback resource allocation method includes the following steps:

step 601: the network equipment sends first configuration information, wherein the first configuration information is used for determining a plurality of feedback resources corresponding to the MBMS, and the plurality of feedback resources are used for a plurality of terminal equipment to send feedback information aiming at the MBMS.

In this embodiment of the present application, a network device sends first configuration information, a terminal device receives the first configuration information, the terminal device determines a first feedback resource from the multiple feedback resources, and sends feedback information on the first feedback resource. Further optionally, the network device may be a base station, e.g. a gNB.

In this embodiment of the present application, the feedback resource is a PUCCH feedback resource for an MBMS service. It may also be understood that the feedback resource is a PUCCH feedback resource corresponding to multicast. The network equipment configures a plurality of PUCCH feedback resources corresponding to multicast.

In this embodiment of the present application, the plurality of feedback resources may be configured by:

mode one

The first configuration information is used for determining a plurality of PUCCH resource sets, and each PUCCH resource set in the plurality of PUCCH resource sets is used for determining one feedback resource.

In an alternative embodiment, the plurality of PUCCH resource sets belong to a first configuration list, and the first configuration list includes configuration information of N PUCCH resource sets, where N is an integer equal to 16. Here, each PUCCH resource set corresponds to one index value, and a plurality of PUCCH resource sets corresponding to a plurality of index values may be determined through the above table 1.

In another optional embodiment, the plurality of PUCCH resource sets belong to a first configuration list, the first configuration list includes configuration information of N PUCCH resource sets, and N is an integer greater than 16. In specific implementation, the configuration of the PUCCH resource sets in table 1 is extended, so as to support the configuration of a greater number (greater than 16) of PUCCH resource sets.

Mode two

The first configuration information is used for determining at least one PUCCH resource set, and for each PUCCH resource set in the at least one PUCCH resource set, the PUCCH resource set and member index numbers of the plurality of terminal devices are used for determining a plurality of feedback resources.

In specific implementation, when calculating Rpucch resources (i.e., feedback resources), each PUCCH resource set introduces a member index number to expand so that one PUCCH resource set can support feedback resources of multiple members (i.e., terminal devices).

It should be noted that, the plurality of feedback resources and the member index numbers of the plurality of terminal devices have a corresponding relationship. Here, the application layer has an index number for each member when constructing a communication group (i.e., a multicast group), and the member index number corresponds to the feedback resource one by one when configuring the feedback resource.

In an optional embodiment of the present application, the network device receives ACK information and/or NACK information for the MBMS service sent by the plurality of terminal devices on the plurality of feedback resources. Here, when each terminal device receives the MBMS service, it will send ACK information or NACK information to the network side on its own feedback resource, and trigger the network side to retransmit.

In this embodiment of the present application, the triggering network device to retransmit the first data may use any one of the following mechanisms:

(A) Retransmission mechanism one

After the network equipment sends first data, a first counter is set to 0, and a first timer is started; the first data is the data of the MBMS service; after the network equipment receives one ACK information aiming at the first data each time, the first counter is controlled to be increased by 1; if the value of the first counter is equal to a first threshold value and the first timer is in an operation state, stopping the first timer and determining that the first data is correctly received by the plurality of terminal devices; and if the first timer is overtime, the network equipment retransmits the first data.

In an optional implementation manner, the first threshold is equal to the number of members in the multicast group corresponding to the MBMS service; or the first threshold value is smaller than the number of members in the multicast group corresponding to the MBMS service.

In an alternative embodiment, the first threshold is configured in a first SIB or in a first MCCH.

In a specific implementation, the first data is a Transport Block (TB). After the network device sends the TBs, maintaining a counter (counter) for each TB, starting a timer (timer), adding 1 to the counter each time an ACK message for the TB is received, and stopping the timer when the counter is equal to the number of members in the multicast group or a preset value before the timer times out; if the timer expires, a retransmission of the TB is triggered.

(B) Retransmission mechanism II

After the network equipment sends the first data, a first timer is started; the first data is the data of the MBMS service; if the network device does not receive NACK information for the first data before the first timer expires, determining that the first data is correctly received by the plurality of terminal devices; and if the network equipment receives NACK information for the first data before the first timer is overtime, the network equipment retransmits the first data.

In a specific implementation, the first data is a transport block TB. After the network device sends the TB, a timer (timer) is started, and before the timer expires, if the network device does not receive NACK information for the TB, the TB is considered to be correctly received; and if the network equipment receives NACK information for the TB, triggering retransmission of the TB.

The technical solution of the embodiment of the present application further provides a communication method, including: the method comprises the steps that terminal equipment receives first configuration information, wherein the first configuration information is used for determining a plurality of feedback resources corresponding to an MBMS; and the terminal equipment determines a first feedback resource from the plurality of feedback resources and sends feedback information on the first feedback resource. It should be noted that the plurality of feedback resources herein may be understood with reference to the foregoing related description.

Fig. 7 is a schematic structural diagram of a feedback resource allocation apparatus provided in an embodiment of the present application, which is applied to a network device, as shown in fig. 7, where the feedback resource allocation apparatus includes:

a sending unit 701, configured to send first configuration information, where the first configuration information is used to determine a first feedback resource corresponding to an MBMS service; the first feedback resource is used for the terminal equipment to send NACK information for the MBMS service.

In an optional embodiment, the first configuration information is used to determine a first PUCCH resource set, where the first PUCCH resource set is used to determine the first feedback resource; or,

the first configuration information is used to determine the first feedback resource.

In an alternative embodiment, the first configuration information is carried in a first MCCH or in a first SIB.

In an alternative embodiment, the first MCCH further carries at least one of the following:

the first indication information is used for indicating whether the MBMS needs HARQ feedback or not;

the second indication information is used for indicating the number of members in the multicast group corresponding to the MBMS;

and the third indication information is used for indicating whether the terminal equipment needs to enter a connection state and then receiving the MBMS.

In an alternative embodiment, the apparatus further comprises:

an allocation unit (not shown in the figure) for allocating a member index number to the terminal device registered to the MBMS service.

In an alternative embodiment, the apparatus further comprises:

and a processing unit 703, configured to retransmit a service data packet corresponding to the NACK information if NACK information is received on the first feedback resource, where the service data packet is a data packet of the MBMS service.

Those skilled in the art will appreciate that the above description of the feedback resource allocation apparatus of the embodiments of the present application may be understood with reference to the description of the feedback resource allocation method of the embodiments of the present application.

Fig. 8 is a schematic diagram ii of the structural composition of the feedback resource allocation apparatus provided in the embodiment of the present application, which is applied to a network device, as shown in fig. 8, where the feedback resource allocation apparatus includes:

a sending unit 801, configured to send first configuration information, where the first configuration information is used to determine a plurality of feedback resources corresponding to an MBMS service, and the plurality of feedback resources are used for a plurality of terminal devices to send feedback information for the MBMS service.

In an alternative embodiment, the first configuration information is used to determine a plurality of PUCCH resource sets, and each PUCCH resource set in the plurality of PUCCH resource sets is used to determine one feedback resource.

In an optional embodiment, the plurality of PUCCH resource sets belong to a first configuration list, where the first configuration list includes configuration information of N PUCCH resource sets, and N is an integer greater than or equal to 16.

In an optional embodiment, the first configuration information is used to determine at least one PUCCH resource set, and for each PUCCH resource set in the at least one PUCCH resource set, the PUCCH resource set and member index numbers of the plurality of terminal devices are used to determine a plurality of feedback resources.

In an optional implementation manner, the plurality of feedback resources and the member index numbers of the plurality of terminal devices have a corresponding relationship.

In an alternative embodiment, the apparatus further comprises:

and a receiving unit 802, configured to receive ACK information and/or NACK information for the MBMS service sent by the plurality of terminal devices on the plurality of feedback resources.

In an alternative embodiment, the apparatus further comprises:

a processing unit 803, configured to set a first counter to 0 after sending the first data, and start a first timer; the first data is the data of the MBMS service; after receiving one ACK information aiming at the first data each time, controlling the first counter to be increased by 1; if the value of the first counter is equal to a first threshold value and the first timer is in an operation state, stopping the first timer and determining that the first data is correctly received by the plurality of terminal devices; and retransmitting the first data if the first timer is overtime.

In an optional implementation manner, the first threshold is equal to the number of members in the multicast group corresponding to the MBMS service; or,

And the first threshold value is smaller than the number of members in the multicast group corresponding to the MBMS.

In an alternative embodiment, the apparatus further comprises:

a processing unit 803, configured to start a first timer after sending the first data; the first data is the data of the MBMS service; if NACK information for the first data is not received before the first timer times out, determining that the first data is correctly received by the plurality of terminal devices; and retransmitting the first data if NACK information for the first data is received before the first timer times out.

In an alternative embodiment, the first data is TB.

Fig. 9 is a schematic structural diagram of a communication device provided in an embodiment of the present application, which is applied to a terminal device, as shown in fig. 9, where the communication device includes:

a receiving unit 901, configured to receive first configuration information, where the first configuration information is used to determine a first feedback resource corresponding to an MBMS service;

A feedback unit 902, configured to send NACK information on the first feedback resource.

Those skilled in the art will appreciate that the foregoing description of the communication apparatus according to the embodiments of the present application may be understood with reference to the feedback resource allocation method and the related description of the communication method according to the embodiments of the present application.

Fig. 10 is a schematic diagram ii of the structural composition of a communication device provided in the embodiment of the present application, which is applied to a terminal device, as shown in fig. 10, where the communication device includes:

A receiving unit 1001, configured to receive first configuration information, where the first configuration information is used to determine a plurality of feedback resources corresponding to an MBMS service;

a feedback unit 1002, configured to determine a first feedback resource from the plurality of feedback resources, and send feedback information on the first feedback resource.

In an alternative embodiment, the first configuration information is used to determine at least one PUCCH resource set, and for each PUCCH resource set in the at least one PUCCH resource set, the PUCCH resource set and member index numbers of the plurality of terminal devices are used to determine a plurality of feedback resources.

Fig. 11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application. The communication device may be a terminal device or a network device, and the communication device 1100 shown in fig. 11 includes a processor 1110, where the processor 1110 may call and execute a computer program from a memory to implement the methods in the embodiments of the present application.

Optionally, as shown in fig. 11, the communication device 1100 may also include a memory 1120. Wherein the processor 1110 may call and run a computer program from the memory 1120 to implement the methods in embodiments of the present application.

Wherein the memory 1120 may be a separate device from the processor 1110 or may be integrated into the processor 1110.

Optionally, as shown in fig. 11, the communication device 1100 may further include a transceiver 1130, and the processor 1110 may control the transceiver 1130 to communicate with other devices, and in particular, may send information or data to other devices, or receive information or data sent by other devices.

The transceiver 1130 may include, among other things, a transmitter and a receiver. Transceiver 1130 may further include antennas, the number of which may be one or more.

Optionally, the communication device 1100 may be specifically a network device in the embodiment of the present application, and the communication device 1100 may implement a corresponding flow implemented by the network device in each method in the embodiment of the present application, which is not described herein for brevity.

Optionally, the communication device 1100 may be specifically a mobile terminal/terminal device in the embodiment of the present application, and the communication device 1100 may implement a corresponding flow implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

Fig. 12 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 1200 shown in fig. 12 includes a processor 1210, and the processor 1210 may call and execute a computer program from a memory to implement the method in the embodiments of the present application.

Optionally, as shown in fig. 12, the chip 1200 may further include a memory 1220. Wherein the processor 1210 may call and run computer programs from the memory 1220 to implement the methods in embodiments of the present application.

The memory 1220 may be a separate device from the processor 1210, or may be integrated into the processor 1210.

Optionally, the chip 1200 may also include an input interface 1230. Wherein the processor 1210 may control the input interface 1230 to communicate with other devices or chips, and in particular, may obtain information or data sent by other devices or chips.

Optionally, the chip 1200 may further include an output interface 1240. Wherein processor 1210 may control the output interface 1240 to communicate with other devices or chips, and in particular may output information or data to other devices or chips.

Optionally, the chip may be applied to a network device in the embodiment of the present application, and the chip may implement a corresponding flow implemented by the network device in each method in the embodiment of the present application, which is not described herein for brevity.

Optionally, the chip may be applied to a mobile terminal/terminal device in the embodiment of the present application, and the chip may implement a corresponding flow implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

Fig. 13 is a schematic block diagram of a communication system 1300 provided in an embodiment of the present application. As shown in fig. 13, the communication system 1300 includes a terminal device 1310 and a network device 1320.

The terminal device 1310 may be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 1320 may be used to implement the corresponding functions implemented by the network device in the above method, which are not described herein for brevity.

It should be appreciated that the processor of an embodiment of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memory is exemplary but not limiting, and for example, the memory in the embodiments of the present application may be Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

Embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

Optionally, the computer readable storage medium may be applied to a network device in the embodiments of the present application, and the computer program causes a computer to execute a corresponding flow implemented by the network device in each method in the embodiments of the present application, which is not described herein for brevity.

Optionally, the computer readable storage medium may be applied to a mobile terminal/terminal device in the embodiments of the present application, and the computer program causes a computer to execute a corresponding procedure implemented by the mobile terminal/terminal device in each method of the embodiments of the present application, which is not described herein for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to a network device in the embodiments of the present application, and the computer program instructions cause the computer to execute corresponding flows implemented by the network device in the methods in the embodiments of the present application, which are not described herein for brevity.

Optionally, the computer program product may be applied to a mobile terminal/terminal device in the embodiments of the present application, and the computer program instructions cause a computer to execute corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiments of the present application, which are not described herein for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to a network device in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the network device in each method in the embodiments of the present application, which is not described herein for brevity.

Optionally, the computer program may be applied to a mobile terminal/terminal device in the embodiments of the present application, where the computer program when run on a computer causes the computer to execute corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiments of the present application, and for brevity, will not be described herein.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A feedback resource allocation method, the method comprising:

the method comprises the steps that network equipment sends first configuration information, wherein the first configuration information is used for determining a plurality of feedback resources corresponding to an MBMS, and the plurality of feedback resources are used for a plurality of terminal equipment to send feedback information aiming at the MBMS;

the first configuration information is used for determining a PUCCH resource set, and the PUCCH resource set and member index numbers of the plurality of terminal devices are used for determining a plurality of feedback resources; the plurality of feedback resources and the member index numbers of the plurality of terminal devices have a corresponding relationship; the first configuration information is carried in a first SIB.

2. The method of claim 1, wherein the first MCCH further carries at least one of:

3. The method of claim 2, wherein the method further comprises:

the network device allocates a member index number to the terminal device registered to the MBMS service.

4. A method according to any one of claims 1 to 3, wherein the method further comprises:

and the network equipment receives ACK information and/or NACK information for the MBMS sent by the plurality of terminal equipment on the plurality of feedback resources.

5. The method of claim 4, wherein the method further comprises:

after the network equipment sends first data, a first counter is set to 0, and a first timer is started; the first data is the data of the MBMS service;

after the network equipment receives one ACK information aiming at the first data each time, the first counter is controlled to be increased by 1;

if the value of the first counter is equal to a first threshold value and the first timer is in an operation state, stopping the first timer and determining that the first data is correctly received by the plurality of terminal devices;

And if the first timer is overtime, the network equipment retransmits the first data.

6. The method of claim 5, wherein,

the first threshold value is equal to the number of members in the multicast group corresponding to the MBMS service; or,

7. The method of claim 5 or 6, wherein the first threshold is configured in a first SIB or in a first MCCH.

8. The method of claim 4, wherein the method further comprises:

after the network equipment sends the first data, a first timer is started; the first data is the data of the MBMS service;

if the network device does not receive NACK information for the first data before the first timer expires, determining that the first data is correctly received by the plurality of terminal devices;

and if the network equipment receives NACK information for the first data before the first timer is overtime, the network equipment retransmits the first data.

9. The method of claim 5 or 8, wherein the first data is a transport block, TB.

10. A method of communication, the method comprising:

the terminal equipment determines a first feedback resource from the plurality of feedback resources, and sends feedback information on the first feedback resource;

the first configuration information is used for determining a PUCCH resource set, and the PUCCH resource set and member index numbers of a plurality of terminal devices are used for determining a plurality of feedback resources; the plurality of feedback resources and the member index numbers of the plurality of terminal devices have a corresponding relationship; the first configuration information is carried in a first SIB.

11. The method of claim 10, wherein the first MCCH further carries at least one of:

12. A feedback resource allocation apparatus, the apparatus comprising:

A sending unit, configured to send first configuration information, where the first configuration information is used to determine a plurality of feedback resources corresponding to an MBMS service, and the plurality of feedback resources are used for a plurality of terminal devices to send feedback information for the MBMS service;

the first configuration information is used for determining a PUCCH resource set, and the PUCCH resource set and member index numbers of the plurality of terminal devices are used for determining a plurality of feedback resources; the plurality of feedback resources and the member index numbers of the plurality of terminal devices have a corresponding relationship; the first configuration information is carried in a first MCCH or a first SIB.

13. The apparatus of claim 12, wherein the first MCCH further carries at least one of:

14. The apparatus of claim 13, wherein the apparatus further comprises:

And the distribution unit is used for distributing a member index number for the terminal equipment registered to the MBMS service.

15. The apparatus according to any one of claims 12 to 14, wherein the apparatus further comprises:

and the receiving unit is used for receiving the ACK information and/or NACK information for the MBMS sent by the plurality of terminal devices on the plurality of feedback resources.

16. The apparatus of claim 15, wherein the apparatus further comprises:

the processing unit is used for setting the first counter to 0 after the first data are sent and starting the first timer; the first data is the data of the MBMS service; after receiving one ACK information aiming at the first data each time, controlling the first counter to be increased by 1; if the value of the first counter is equal to a first threshold value and the first timer is in an operation state, stopping the first timer and determining that the first data is correctly received by the plurality of terminal devices; and retransmitting the first data if the first timer is overtime.

17. The apparatus of claim 16, wherein,

18. The apparatus of claim 16 or 17, wherein the first threshold is configured in a first SIB or in a first MCCH.

19. The apparatus of claim 15, wherein the apparatus further comprises:

the processing unit is used for starting a first timer after the first data are sent; the first data is the data of the MBMS service; if NACK information for the first data is not received before the first timer times out, determining that the first data is correctly received by the plurality of terminal devices; and retransmitting the first data if NACK information for the first data is received before the first timer times out.

20. The apparatus of claim 16 or 19, wherein the first data is TB.

21. A communication device, the device comprising:

a feedback unit, configured to determine a first feedback resource from the plurality of feedback resources, and send feedback information on the first feedback resource;

22. The apparatus of claim 21, wherein the first MCCH further carries at least one of:

23. A communication device, comprising: a processor and a memory for storing a computer program, the processor being adapted to invoke and run the computer program stored in the memory, to perform the method of any of claims 1 to 9, or the method of any of claims 10 to 11.

24. A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method of any one of claims 1 to 9 or the method of any one of claims 10 to 11.

25. A computer readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 9 or the method of any one of claims 10 to 11.