WO2022266961A1 - 一种变量的维护方法及装置、终端设备 - Google Patents

一种变量的维护方法及装置、终端设备 Download PDF

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Publication number
WO2022266961A1
WO2022266961A1 PCT/CN2021/102196 CN2021102196W WO2022266961A1 WO 2022266961 A1 WO2022266961 A1 WO 2022266961A1 CN 2021102196 W CN2021102196 W CN 2021102196W WO 2022266961 A1 WO2022266961 A1 WO 2022266961A1
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value
initial value
terminal device
variable
hfn
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PCT/CN2021/102196
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English (en)
French (fr)
Inventor
王淑坤
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2021/102196 priority Critical patent/WO2022266961A1/zh
Priority to CN202180096208.6A priority patent/CN117063544A/zh
Publication of WO2022266961A1 publication Critical patent/WO2022266961A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the embodiments of the present application relate to the technical field of mobile communications, and in particular to a method and device for maintaining variables, and a terminal device.
  • the multicast broadcast service (Multicast Broadcast Service, MBS) service of the multicast type is supported.
  • the terminal device receives the multicast MBS service in a radio resource control (Radio Resource Control, RRC) connected state.
  • the terminal device can receive the multicast MBS service in a point-to-multipoint (Point To MultiPoint, PTM) way or a point-to-point (Point To Point, PTP) way.
  • RRC Radio Resource Control
  • the MBS service is sent to all terminal devices in a certain group.
  • how to maintain variables related to the receiving window on the terminal device side to ensure that data packets can be received normally is a problem that needs to be solved.
  • Embodiments of the present application provide a variable maintenance method and device, a terminal device, a chip, a computer-readable storage medium, a computer program product, and a computer program.
  • the terminal device receives first configuration information sent by the network device, where the first configuration information is used to determine a first offset value between a first variable and a second variable; wherein, the first variable and the second variable Variables related to the receiving window;
  • the terminal device determines the value of the first variable, and determines the value of the second variable based on the value of the first variable and the first offset value.
  • variable maintenance device provided in the embodiment of the present application is applied to terminal equipment, and the device includes:
  • a receiving unit configured to receive first configuration information sent by a network device, where the first configuration information is used to determine a first offset value between a first variable and a second variable; wherein, the first variable and the The second variable is a variable related to the receiving window;
  • a determining unit configured to determine the value of the first variable, and determine the value of the second variable based on the value of the first variable and the first offset value.
  • the terminal device provided in the embodiment of the present application includes a processor and a memory.
  • the memory is used for storing computer programs
  • the processor is used for invoking and running the computer programs stored in the memory to execute the above variable maintenance method.
  • the network device provided in the embodiment of the present application may be the first device in the above solution or the second device in the above solution, and the communication device includes a processor and a memory.
  • the memory is used for storing computer programs, and the processor is used for invoking and running the computer programs stored in the memory to execute the above variable maintenance method.
  • the chip provided in the embodiment of the present application is used to implement the above variable maintenance method.
  • the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the above variable maintenance method.
  • the computer-readable storage medium provided by the embodiment of the present application is used for storing a computer program, and the computer program enables the computer to execute the above variable maintenance method.
  • the computer program product provided by the embodiments of the present application includes computer program instructions, and the computer program instructions cause the computer to execute the above variable maintenance method.
  • the computer program provided by the embodiments of the present application when running on a computer, enables the computer to execute the above method for maintaining variables.
  • the network device configures the first offset value for the terminal device, the terminal device determines the value of the first variable, and determines the value of the second variable based on the value of the first variable and the first offset value, wherein , the first variable and the second variable are variables related to the receiving window.
  • the terminal device maintains the first variable and the second variable related to the receiving window, thereby providing a guarantee for the terminal device to receive data packets normally. Guarantee, so that the loss of data packets is as little as possible, and the transmission reliability of data packets is improved.
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application
  • Fig. 2 is the schematic diagram of the protocol stack corresponding to the PTM mode and the PTP mode of the embodiment of the present application;
  • FIG. 3 is a schematic diagram of the transmission of the MBS service provided by the embodiment of the present application according to the PTM mode and the PTP mode;
  • Figure 4-1 is a first schematic diagram of the values of the variables associated with the PDCP receiving window provided by the embodiment of the present application;
  • FIG. 4-2 is a first schematic diagram of the values of variables associated with the RLC receiving window provided by the embodiment of the present application.
  • Fig. 5 is a schematic flowchart of a variable maintenance method provided by the embodiment of the present application.
  • Figure 6-1 is a second schematic diagram of the values of variables associated with the PDCP receiving window provided by the embodiment of the present application.
  • Figure 6-2 is a schematic diagram of the values of the variables associated with the PDCP receiving window provided by the embodiment of the present application III;
  • Figure 7-1 is a second schematic diagram of the values of variables associated with the RLC receiving window provided by the embodiment of the present application.
  • Figure 7-2 is a schematic diagram of the values of the variables associated with the RLC receiving window provided in the embodiment of the present application III;
  • FIG. 8 is a schematic diagram of an update of the RLC receiving window provided by the embodiment of the present application.
  • Fig. 9 is a schematic diagram of the structural composition of the variable maintenance device provided by the embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • Fig. 12 is a schematic block diagram of a communication system provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • a communication system 100 may include a terminal device 110 and a network device 120 .
  • the network device 120 may communicate with the terminal device 110 through an air interface. Multi-service transmission is supported between the terminal device 110 and the network device 120 .
  • the embodiment of the present application is only described by using the communication system 100 as an example, but the embodiment of the present application is not limited thereto. That is to say, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (Long Term Evolution, LTE) system, LTE Time Division Duplex (Time Division Duplex, TDD), Universal Mobile Communication System (Universal Mobile Telecommunication System, UMTS), Internet of Things (Internet of Things, IoT) system, Narrow Band Internet of Things (NB-IoT) system, enhanced Machine-Type Communications (eMTC) system, 5G communication system (also known as New Radio (NR) communication system), or future communication systems, etc.
  • LTE Long Term Evolution
  • LTE Time Division Duplex Time Division Duplex
  • TDD Time Division Duplex
  • Universal Mobile Telecommunication System Universal Mobile Telecommunication System
  • UMTS Universal Mobile Communication System
  • Internet of Things Internet of Things
  • NB-IoT Narrow Band Internet of Things
  • eMTC enhanced Machine-Type Communications
  • the network device 120 may be an access network device that communicates with the terminal device 110 .
  • the access network device can provide communication coverage for a specific geographical area, and can communicate with terminal devices 110 (such as UEs) located in the coverage area.
  • the network device 120 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in a Long Term Evolution (Long Term Evolution, LTE) system, or a Next Generation Radio Access Network (NG RAN) device, Either a base station (gNB) in the NR system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device 120 can be a relay station, an access point, a vehicle-mounted device, a wearable Devices, hubs, switches, bridges, routers, or network devices in the future evolution of the Public Land Mobile Network (Public Land Mobile Network, PLMN), etc.
  • Evolutional Node B, eNB or eNodeB in a Long Term Evolution (Long Term Evolution, LTE) system
  • NG RAN Next Generation Radio Access Network
  • gNB base station
  • CRAN Cloud Radio Access Network
  • the network device 120 can be a relay station, an access point, a vehicle-mounted device, a wear
  • the terminal device 110 may be any terminal device, including but not limited to a terminal device connected to the network device 120 or other terminal devices by wire or wirelessly.
  • the terminal equipment 110 may refer to an access terminal, a user equipment (User Equipment, UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, user agent, or user device.
  • Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, IoT devices, satellite handheld terminals, Wireless Local Loop (WLL) stations, Personal Digital Assistant , PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolution networks, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device 110 can be used for device-to-device (Device to Device, D2D) communication.
  • D2D Device to Device
  • the wireless communication system 100 may also include a core network device 130 that communicates with the base station.
  • the core network device 130 may be a 5G core network (5G Core, 5GC) device, for example, Access and Mobility Management Function (Access and Mobility Management Function , AMF), and for example, authentication server function (Authentication Server Function, AUSF), and for example, user plane function (User Plane Function, UPF), and for example, session management function (Session Management Function, SMF).
  • the core network device 130 may also be a packet core evolution (Evolved Packet Core, EPC) device of the LTE network, for example, a data gateway (Session Management Function+Core Packet Gateway, SMF+PGW- C) equipment.
  • EPC packet core evolution
  • SMF+PGW-C can realize the functions of SMF and PGW-C at the same time.
  • the above-mentioned core network equipment may be called by other names, or a new network entity may be formed by dividing functions of the core network, which is not limited in this embodiment of the present application.
  • Various functional units in the communication system 100 may also establish a connection through a next generation network (next generation, NG) interface to implement communication.
  • NG next generation network
  • the terminal device establishes an air interface connection with the access network device through the NR interface to transmit user plane data and control plane signaling; the terminal device can establish a control plane signaling connection with the AMF through the NG interface 1 (N1 for short); access Network equipment such as the next generation wireless access base station (gNB), can establish a user plane data connection with UPF through NG interface 3 (abbreviated as N3); access network equipment can establish control plane signaling with AMF through NG interface 2 (abbreviated as N2) connection; UPF can establish a control plane signaling connection with SMF through NG interface 4 (abbreviated as N4); UPF can exchange user plane data with the data network through NG interface 6 (abbreviated as N6); AMF can communicate with SMF through NG interface 11 (abbreviated as N11) The SMF establishes a control plane signaling connection; the SMF may establish a control plane signaling connection with the PCF through an NG interface 7 (N7 for short).
  • gNB next generation wireless access base station
  • Figure 1 exemplarily shows a base station, a core network device, and two terminal devices.
  • the wireless communication system 100 may include multiple base station devices and each base station may include other numbers of terminals within the coverage area.
  • the device is not limited in the embodiment of this application.
  • FIG. 1 is only an illustration of a system applicable to this application, and of course, the method shown in the embodiment of this application may also be applicable to other systems.
  • system and “network” are often used interchangeably herein.
  • the term “and/or” in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations.
  • the character "/" in this article generally indicates that the contextual objects are an "or” relationship.
  • the "indication” mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship.
  • A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.
  • the "correspondence” mentioned in the embodiments of the present application may mean that there is a direct correspondence or an indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated. , configuration and configured relationship.
  • the "predefined” or “predefined rules” mentioned in the embodiments of this application can be used by pre-saving corresponding codes, tables or other It is implemented by indicating related information, and this application does not limit the specific implementation.
  • pre-defined may refer to defined in the protocol.
  • the "protocol” may refer to a standard protocol in the communication field, for example, it may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, and this application does not limit this .
  • 5G 3rd Generation Partnership Project
  • eMBB Enhanced Mobile Broadband
  • URLLC Ultra-Reliable Low-Latency Communications
  • mMTC Massive Machine-Type Communications
  • eMBB still aims at users obtaining multimedia content, services and data, and its demand is growing rapidly.
  • eMBB may be deployed in different scenarios, such as indoors, urban areas, and rural areas, the capabilities and requirements vary greatly, so it cannot be generalized, and detailed analysis must be combined with specific deployment scenarios.
  • Typical applications of URLLC include: industrial automation, electric power automation, telemedicine operations (surgery), traffic safety guarantee, etc.
  • the typical characteristics of mMTC include: high connection density, small data volume, delay-insensitive services, low cost and long service life of modules, etc.
  • NR In the early deployment of NR, it is difficult to obtain complete NR coverage, so the typical network coverage is wide-area LTE coverage and NR island coverage mode. Moreover, a large number of LTE deployments are below 6GHz, and there is very little spectrum below 6GHz that can be used for 5G. Therefore, NR must study the spectrum application above 6GHz, while the coverage of high frequency bands is limited and the signal fades quickly. At the same time, in order to protect mobile operators' early investment in LTE, a working mode of tight interworking between LTE and NR is proposed.
  • RRC Radio Resource Control
  • RRC_IDLE state (referred to as idle (idle) state): Mobility is UE-based cell selection and reselection, paging is initiated by the core network (Core Network, CN), and the paging area is configured by the CN. There is no UE context and no RRC connection at the base station side.
  • RRC_CONNECTED state (connected state for short): there is an RRC connection, and UE context exists on the base station side and the UE side.
  • the network side knows the location of the UE at the specific cell level. Mobility is mobility controlled by the network side. Unicast data can be transmitted between the UE and the base station.
  • Mobility is UE-based cell selection and reselection, there is a connection between CN-NR, UE context exists on a certain base station, paging is triggered by RAN, based on The paging area of the RAN is managed by the RAN, and the network side knows the location of the UE based on the paging area level of the RAN.
  • MBMS Multimedia Broadcast Multicast Service
  • MBMS is a technology that transmits data from one data source to multiple terminal devices by sharing network resources. This technology can effectively use network resources while providing multimedia services, and realize broadcasting of multimedia services at a higher rate (such as 256kbps) and multicast.
  • 3GPP clearly proposed to enhance the ability to support downlink high-speed MBMS services, and determined the design requirements for the physical layer and air interface.
  • eMBMS evolved MBMS
  • eMBMS evolved MBMS
  • MBSFN Single Frequency Network
  • MBSFN uses a unified frequency to transmit service data in all cells at the same time, but To ensure the synchronization between cells. This method can greatly improve the overall signal-to-noise ratio distribution of the cell, and the spectrum efficiency will also be greatly improved accordingly.
  • eMBMS implements broadcast and multicast of services based on the IP multicast protocol.
  • MBMS In LTE or LTE-Advanced (LTE-Advanced, LTE-A), MBMS only has a broadcast bearer mode, but no multicast bearer mode. In addition, the reception of MBMS service is applicable to terminal equipments in idle state or connected state.
  • 3GPP R13 introduced the concept of Single Cell Point To Multiploint (SC-PTM), and SC-PTM is based on the MBMS network architecture.
  • MBMS introduces new logical channels, including Single Cell-Multicast Control Channel (Single Cell-Multicast Control Channel, SC-MCCH) and Single Cell-Multicast Transport Channel (Single Cell-Multicast Transport Channel, SC-MTCH).
  • SC-MCCH and SC-MTCH are mapped to the downlink shared channel (Downlink-Shared Channel, DL-SCH), and further, DL-SCH is mapped to the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), wherein, SC - MCCH and SC-MTCH belong to logical channels, DL-SCH belongs to transport channels, and PDSCH belongs to physical channels.
  • SC-MCCH and SC-MTCH do not support Hybrid Automatic Repeat reQuest (HARQ) operation.
  • HARQ Hybrid Automatic Repeat reQuest
  • SIB20 System Information Block
  • SIB20 is used to transmit SC-MCCH configuration information, and one cell has only one SC-MCCH.
  • the SC-MCCH configuration information includes: SC-MCCH modification period, SC-MCCH repetition period, and information such as radio frames and subframes for scheduling SC-MCCH.
  • the SC-MCCH is scheduled through a Physical Downlink Control Channel (PDCCH).
  • a new radio network temporary identity Radio Network Tempory Identity, RNTI
  • RNTI Radio Network Tempory Identity
  • SC-RNTI Single Cell RNTI
  • the fixed value of SC-RNTI is FFFC.
  • a new RNTI is introduced, that is, a single cell notification RNTI (Single Cell Notification RNTI, SC-N-RNTI) to identify the PDCCH used to indicate the change notification of the SC-MCCH (such as notifying the PDCCH).
  • the SC The fixed value of -N-RNTI is FFFB; further, one of the 8 bits (bits) of DCI 1C can be used to indicate the change notification.
  • SC-PTM configuration information is based on SC-MCCH configured by SIB20, and then SC-MCCH configures SC-MTCH, and SC-MTCH is used to transmit service data.
  • the SC-MCCH only transmits one message (that is, SCPTMConfiguration), which is used to configure configuration information of the SC-PTM.
  • the configuration information of SC-PTM includes: temporary mobile group identity (Temporary Mobile Group Identity, TMGI), session identification (seession id), group RNTI (Group RNTI, G-RNTI), discontinuous reception (Discontinuous Reception, DRX) configuration information And the SC-PTM service information of the neighboring cell, etc.
  • TMGI Temporal Mobile Group Identity
  • TMGI Temporal Mobile Group Identity
  • session identification seession id
  • group RNTI Group RNTI, G-RNTI
  • discontinuous reception Discontinuous Reception, DRX
  • SC-PTM service information of the neighboring cell etc.
  • SC-PTM in R13 does not support Robust Header Compression (Robust Header Compression, ROHC) function.
  • the downlink discontinuous reception of SC-PTM is controlled by the following parameters: onDurationTimerSCPTM, drx-InactivityTimerSCPTM, SC-MTCH-SchedulingCycle, and SC-MTCH-SchedulingOffset.
  • the downlink SC-PTM service is received only when the timer onDurationTimerSCPTM or drx-InactivityTimerSCPTM is running.
  • SC-PTM business continuity adopts the concept of MBMS business continuity based on SIB15, that is, "SIB15+MBMSInterestIndication" mode.
  • SIB15 MBMS business continuity
  • the service continuity of terminal equipment in idle state is based on the concept of frequency priority.
  • the multicast-type MBS service refers to the MBS service transmitted in a multicast manner.
  • the broadcast-type MBS service refers to the MBS service transmitted by broadcasting.
  • the MBS service is sent to all terminal devices in a certain group.
  • the terminal equipment receives the multicast type MBS service in the RRC connection state, and the terminal equipment can receive the multicast type MBS service data through the PTM mode or the PTP mode.
  • the MBS service data in the PTM mode scrambles the corresponding scheduling information through the G-RNTI configured on the network side
  • the MBS service data in the PTP mode scrambles the corresponding scheduling information through the C-RNTI.
  • the base station can deliver the MSB service to all terminal devices in a group through the air interface.
  • the base station can deliver the MSB service to all terminal devices in a group through PTP and/or PTM.
  • a group includes Terminal 1, Terminal 2, and Terminal 3.
  • the base station can deliver the MBS service to Terminal 1 through PTP, deliver the MBS service to Terminal 2 through PTP, and deliver the MBS
  • the service is delivered to terminal equipment 3; or, the base station can deliver the MBS service to terminal equipment 1 through PTP, and the MBS service can be delivered to terminal equipment 2 and terminal equipment 3 through PTM; or, the base station can deliver the MBS service to terminal equipment 3 through PTM.
  • the MBS service is delivered to terminal device 1, terminal device 2 and terminal device 3.
  • a shared GTP tunnel (Shared GTP tunnel) is used between the core network and the base station to transmit MBS services, that is, both the PTM MBS service and the PTP MBS service share the GTP tunnel.
  • the base station delivers MBS service data to UE1 and UE2 in a PTM manner, and delivers MBS service data to UE3 in a PTP manner.
  • the multicast MBS service especially for the PTM multicast MBS service
  • multiple terminal devices in the MBS group all receive the MBS service.
  • the maintenance of the variable associated with the receiving window (referred to as the receiving window variable) by the terminal device is different for the MBS service and the unicast service, for example: the initial value of the receiving window variable of the MBS service and the initial value of the receiving window variable of the unicast service The values are different.
  • the corresponding receiving window is called the PDCP receiving window
  • the variables associated with the PDCP receiving window mainly include: RX_NEXT and RX_DELIV.
  • the corresponding receive window is called an RLC receive window.
  • the variables associated with the RLC receiving window mainly include: RX_Next_Highest and RX_Next_Reassembly.
  • the variables associated with the RLC receiving window mainly include: RX_Next_Highest and RX_Next.
  • the initial values of RX_NEXT and RX_DELIV are 0, as shown in Figure 4-1.
  • the initial values of RX_Next_Highest and RX_Next_Reassembly are 0, as shown in Figure 4-2.
  • the initial value of the serial number (Serial Number, SN) part in RX_NEXT and RX_DELIV is determined based on the SN of the terminal device receiving the first data packet.
  • the initial values of RX_Next_Highest and RX_Next_Reassembly are also determined based on the SN at which the terminal device receives the first data packet.
  • the multicast type MSB service especially for the PTM multicast type MBS service, there will be a problem of high packet loss rate, because if the SN of the data packet received by the terminal device is less than the variable The value of the SN part or the value of the variable, the packet will be discarded.
  • Fig. 5 is a schematic flowchart of a variable maintenance method provided in the embodiment of the present application. As shown in Fig. 5, the variable maintenance method includes the following steps:
  • Step 501 The terminal device receives the first configuration information sent by the network device, the first configuration information is used to determine a first offset value between the first variable and the second variable; wherein, the first variable and the The second variable is a variable related to the receiving window.
  • the network device may be a base station.
  • the first configuration information is configured through RRC dedicated signaling.
  • Step 502 The terminal device determines the value of the first variable, and determines the value of the second variable based on the value of the first variable and the first offset value.
  • the receiving window is a PDCP receiving window or an RLC receiving window, and the technical solution of the embodiment of the present application will be described below in combination with the PDCP receiving window and the RLC receiving window respectively.
  • Solution 1 PDCP receiving window
  • the receiving window is a PDCP receiving window
  • the first variable is used to indicate a first count (COUNT) value
  • the first COUNT value refers to the value associated with the next data packet expected to be received.
  • COUNT value; the second variable is used to indicate a second COUNT value, and the second COUNT value refers to the COUNT value associated with the first data packet not delivered to the upper layer.
  • a data packet refers to a PDCP SDU.
  • the first variable is marked as RX_NEXT
  • the second variable is marked as RX_DELIV.
  • the first COUNT value indicated by the first variable includes the first HFN and the first SN.
  • the second COUNT value includes the second HFN and the second SN. How the terminal device maintains the first COUNT value and the second COUNT value will be described below. It should be noted that the maintenance of the first COUNT value can be understood as the maintenance of the first variable, and similarly, the maintenance of the second COUNT value can be understood as the maintenance of the second variable.
  • the terminal device determines the initial value of the first HFN based on the second configuration information sent by the network device, and determines the first HFN value based on the SN of the first data packet received by the terminal device.
  • the initial value of SN is the initial value of SN.
  • the second configuration information is configured through RRC dedicated signaling.
  • the terminal device can obtain the initial value of the first HFN through RRC dedicated signaling.
  • the SN of the data packet is carried in the header of the data packet, and the terminal device can obtain the SN of the data packet by analyzing the header of the data packet, and then determine the initial value of the first SN according to the SN of the data packet.
  • the initial value of the first SN is:
  • x is the SN value of the first data packet received by the terminal device
  • PDCP-SN-Size is the number of SN values supported by the PDCP entity
  • Mod is a remainder operation.
  • the terminal device determines the initial value of the second HFN based on the initial value of the first HFN, and determines the initial value of the second HFN based on the initial value of the first SN and the first offset value The initial value of the second SN.
  • the first offset value may also be referred to as a PDCP SN offset (PDCP SN offset) value.
  • PDCP SN offset PDCP SN offset
  • the terminal device determines that the initial value of the second SN is equal to 0, and determines that the The initial value of the second HFN is equal to the initial value of the first HFN; if the initial value of the first SN minus the first offset value is greater than or equal to 0, the terminal device determines the second SN The initial value of is equal to the initial value of the first SN minus the first offset value, and the initial value of the second HFN is determined to be equal to the initial value of the first HFN.
  • the terminal device determines that the initial value of the second SN is equal to the initial value of the first SN Subtract the first offset value plus the size of the PDCP receiving window, and determine that the initial value of the second HFN is equal to the initial value of the first HFN minus 1; if the initial value of the first SN minus If the first offset value is greater than or equal to 0, the terminal device determines that the initial value of the second SN is equal to the initial value of the first SN minus the first offset value, and determines that the second The initial value of HFN is equal to the initial value of the first HFN.
  • the receiving window is an RLC receiving window
  • the first variable is used to indicate a third SN
  • the third SN refers to an SN located behind the SN of the first data packet
  • the first variable A data packet is the data packet with the highest SN among the received data packets
  • the second variable is used to indicate the fourth SN
  • the fourth SN refers to the earliest SN of the data packet not completely received.
  • the RLC entity of the terminal device is in UM or AM.
  • An RLC entity in the UM may also be called a UM RLC entity
  • an RLC entity in the AM may also be called an AM RLC entity.
  • the data packet in the above scheme refers to UMD PDU
  • AM the data packet in the above scheme refers to AMD PDU
  • the first variable is marked as RX_Next_Highest, and the second variable is marked as RX_Next_Reassembly.
  • the first variable is marked as RX_Next_Highest, and the second variable is marked as RX_Next.
  • the maintenance for the third SN can be understood as the maintenance for the first variable
  • the maintenance for the fourth SN can be understood as the maintenance for the second variable.
  • the terminal device determines the initial value of the third SN based on the SN of the first data packet received by the terminal device.
  • the SN of the data packet is carried in the header of the data packet, and the terminal device can obtain the SN of the data packet by analyzing the header of the data packet, and then determine the initial value of the third SN according to the SN of the data packet.
  • the initial value of the third SN is the value of the SN of the first data packet received by the terminal device.
  • the terminal device determines the initial value of the fourth SN based on the initial value of the third SN and the first offset value.
  • the first offset value may be referred to as an RLC SN offset (RLC SN offset) value.
  • the terminal device determines that the initial value of the fourth SN is equal to 0; The initial value of the three SNs minus the first offset value is greater than or equal to 0, then the terminal device determines that the initial value of the fourth SN is equal to the initial value of the third SN minus the first offset value.
  • the terminal device determines that the initial value of the fourth SN is equal to that of the third SN The initial value minus the first offset value plus the size of the RLC receiving window; if the initial value of the third SN minus the first offset value is greater than or equal to 0, then the terminal device determines that the The initial value of the fourth SN is equal to the initial value of the third SN minus the first offset value.
  • the terminal device when the RLC entity of the terminal device is in the confirmation mode, the terminal device receives the third configuration information sent by the network device, and the third configuration information is used to determine the duration of the first timer or The threshold of the first counter; the terminal device updates the RLC receiving window based on the first timer or the first counter.
  • the third configuration information is configured through RRC dedicated signaling.
  • the terminal device when the RLC entity is in the confirmation mode, the terminal device will only update the RLC receiving window when the data packet is received correctly. If there are data packets that cannot be received correctly for many times, the terminal device will not Updating the RLC receiving window will cause the RLC receiving window to stagnate or be stuck, and for the MBS service, a large number of packet loss phenomena will occur. For this reason, the network device triggers the terminal device to update the RLC receiving window by configuring the first timer or the first counter, so as to avoid the risk of the RLC receiving window being stagnant or stuck. How to update the RLC receiving window will be described below in conjunction with the first timer and the first counter.
  • the RLC receiving window is updated based on the first timer
  • the terminal device After the terminal device receives the third configuration information, it starts the first timer; if the first timer times out, the terminal device The SN updates the RLC receiving window, or the terminal device determines that the data packets outside the RLC receiving window are valid data packets and updates the RLC receiving window based on the SN of the valid data packets.
  • the RLC layer of the terminal device restarts the first timer after receiving the data packet from the MAC layer.
  • the terminal device restarts the first timer after updating the RLC receiving window.
  • the terminal device after the terminal device receives the third configuration information, it starts the first counter; every time the terminal device receives a data packet outside the RLC receiving window, it controls the Adding 1 to the value of the first counter; if the value of the first counter is greater than or equal to the threshold of the first counter, the terminal device updates the RLC receiving window based on the SN of the latest received data packet , or, the terminal device determines that the data packets outside the RLC receiving window are valid data packets and updates the RLC receiving window based on the SN of the valid data packets.
  • the terminal device resets the first counter after updating the RLC receiving window.
  • the terminal device receives the multicast type MBS service based on the value of the first variable and the value of the second variable, especially the multicast type MBS service in the PTM mode, which ensures that the terminal The device receives data packets normally, so that the loss of data packets is as small as possible, and the transmission reliability of data packets is improved.
  • the variables associated with the PDCP receive window include RX_NEXT and RX_DELIV.
  • RX_NEXT is used to indicate the COUNT value associated with the next data packet expected to be received, which is called the first COUNT value.
  • RX_DELIV is used to indicate the COUNT value associated with the first data packet not delivered to the upper layer, which is called the second COUNT value.
  • the first HFN and the first SN are included.
  • the second COUNT value indicated by RX_DELIV the second HFN and the second SN are included.
  • the base station configures the HFN value for PDCP reception for the MBS service through RRC dedicated signaling, and the HFN value is used as the initial value of the first HFN corresponding to RX_NEXT.
  • the terminal device determines the initial value of the first SN corresponding to RX_NEXT according to the received SN of the first data packet.
  • the terminal device determines the initial value of the first HFN and the initial value of the first SN, that is, determines the initial value of the first COUNT value, that is, determines the initial value of RX_NEXT.
  • the base station configures the PDCP SN offset value used for PDCP reception for the MBS service through RRC dedicated signaling.
  • the PDCP SN offset value is the SN difference between the first SN corresponding to RX_NEXT and the second SN corresponding to RX_DELIV.
  • the terminal device determines the initial values of the second HFN and the second SN corresponding to RX_DELIV in the following manner.
  • the initial value of the first SN minus the PDCP SN offset value is less than 0, it is determined that the initial value of the second SN is equal to 0, and the initial value of the second HFN is equal to the initial value of the first HFN.
  • the initial value of the first SN minus the PDCP SN offset value is greater than or equal to 0
  • the initial value of the second HFN is equal to The initial value of the first HFN.
  • the initial value of the first SN minus the PDCP SN offset value is less than 0, determine that the initial value of the second SN is equal to the initial value of the first SN minus the PDCP SN offset value plus the size of the PDCP receive window, and the second SN The initial value of the second HFN is equal to the initial value of the first HFN minus 1.
  • the initial value of the first SN minus the PDCP SN offset value is greater than or equal to 0
  • the initial value of the second HFN is equal to The initial value of the first HFN.
  • the size of the PDCP receiving window is determined based on the PDCP-SN-Size, and the PDCP-SN-Size is the number of SN values supported by the PDCP entity.
  • the terminal device determines the initial value of the second HFN and the initial value of the second SN, that is, determines the initial value of the second COUNT value, that is, determines the initial value of RX_DELIV.
  • the SN value of the first data packet received by the terminal device is 1, then the value of the first SN corresponding to RX_NEXT is 2.
  • the base station configures a PDCP SN offset value of 4, then, since the value of the first SN minus the PDCP SN offset value is less than 0, the value of the second SN corresponding to RX_DELIV is equal to 0.
  • the SN value of the first data packet received by the terminal device is 1, then the value of the first SN corresponding to RX_NEXT is 2.
  • the variables associated with the RLC receive window include RX_Next_Highest and RX_Next_Reassembly.
  • the variables associated with the RLC receive window include RX_Next_Highest and RX_Next.
  • RX_Next_Highest is used to indicate the SN behind the SN of the first data packet, which is the data packet with the highest SN in the received data packet, called the third SN;
  • RX_Next_Reassembly/RX_Next is used to indicate the earliest one without The SN of the completely received data packet is called the fourth SN.
  • the terminal device determines the initial value of the third SN corresponding to RX_Next_Highest according to the received SN of the first data packet.
  • the terminal device determines the initial value of the third SN, that is, determines the initial value of RX_Next_Highest.
  • the base station configures the RLC SN offset value for RLC reception for the MBS service through RRC dedicated signaling.
  • the RLC SN offset value is the SN difference between the third SN corresponding to RX_Next_Highest and the fourth SN corresponding to RX_Next_Reassembly.
  • the RLC SN offset value is the SN difference between the third SN corresponding to RX_Next_Highest and the fourth SN corresponding to RX_Next.
  • the terminal device determines the initial value of the fourth SN corresponding to RX_Next_Reassembly or RX_Next in the following manner.
  • the initial value of the third SN minus the RLC SN offset value is less than 0, it is determined that the initial value of the fourth SN is equal to 0.
  • the initial value of the third SN minus the RLC SN offset value is greater than or equal to 0, then it is determined that the initial value of the fourth SN is equal to the initial value of the third SN minus the RLC SN offset value.
  • the initial value of the third SN minus the RLC SN offset value is less than 0, then determine that the initial value of the fourth SN is equal to the initial value of the third SN minus the RLC SN offset value plus the size of the RLC receiving window.
  • the initial value of the third SN minus the RLC SN offset value is greater than or equal to 0, then it is determined that the initial value of the fourth SN is equal to the initial value of the third SN minus the RLC SN offset value.
  • the size of the RLC receiving window is determined in the following manner: if the SN is configured as 6 bits, the size of the RLC receiving window is 32; if the SN is configured as 12 bits, the size of the RLC receiving window is 2048.
  • the size of the RLC receiving window is determined as follows: if the SN is configured as 12 bits, the size of the RLC receiving window is 2048; if the SN is configured as 18 bits, the size of the RLC receiving window is 131072.
  • the terminal device determines the initial value of the fourth SN, that is, determines the initial value of RX_Next_Reassembly/RX_Next.
  • the SN value of the first data packet received by the terminal device is 1, then the value of the third SN corresponding to RX_Next_Highest is 2.
  • the base station configures an RLC SN offset value of 4, then, since the value of the third SN minus the RLC SN offset value is less than 0, the value of the fourth SN corresponding to RX_Next_Reassembly/RX_Next is equal to 0.
  • the SN value of the first data packet received by the terminal device is 1, then the value of the third SN corresponding to RX_Next_Highest is 2.
  • the base station configures the RLC SN offset value to be 4, then, since the value of the third SN minus the RLC SN offset value is less than 0, the value of the fourth SN corresponding to RX_Next_Reassembly/RX_Next is equal to the third SN
  • the base station configures the duration of a timer (that is, the first timer in the above solution) through RRC dedicated signaling, and the timer is used to control whether to update the RLC receiving window according to the latest received data packet, or whether to consider The data outside the window of the RLC receiving window is valid data, and then the RLC receiving window is re-updated.
  • a timer that is, the first timer in the above solution
  • the terminal device starts the timer after receiving the timer, optionally, if the RLC layer of the terminal device receives the RLC PDU from the MAC layer, then restarts the timer. If the timer expires, the terminal equipment updates the RLC receiving window according to the SN of the latest received data packet, or the terminal equipment considers the out-of-window data of the RLC window as valid data, and updates the RLC receiving window according to the SN of valid data. After updating the RLC receiving window, the terminal device restarts the timer.
  • the base station configures the threshold of a counter (that is, the first counter in the above solution) through RRC dedicated signaling, and the counter is used to control whether to renew the RLC receiving window according to the latest received data packet, or whether to consider The data outside the window of the RLC receiving window is valid data, and then the RLC receiving window is re-updated.
  • a counter that is, the first counter in the above solution
  • the SN of the packet updates the RLC receiving window, or the terminal device considers the data outside the RLC window as valid data, and updates the RLC receiving window according to the SN of the valid data. After updating the RLC receiving window, the terminal device resets the counter to 0.
  • the RLC receive window is updated from position 1 to position 2 under the trigger of a timer or a counter.
  • the length of the RLC receive window remains unchanged, and the maximum SN of the RLC receive window is updated.
  • the out-of-window data of the RLC receiving window refers to the data on the right side of the RLC receiving window.
  • sequence numbers of the above-mentioned processes do not mean the order of execution, and the order of execution of the processes should be determined by their functions and internal logic, and should not be used in this application.
  • the implementation of the examples constitutes no limitation.
  • the terms “downlink”, “uplink” and “sidelink” are used to indicate the transmission direction of signals or data, wherein “downlink” is used to indicate that the transmission direction of signals or data is sent from the station The first direction to the user equipment in the cell, “uplink” is used to indicate that the signal or data transmission direction is the second direction sent from the user equipment in the cell to the station, and “side line” is used to indicate that the signal or data transmission direction is A third direction sent from UE1 to UE2.
  • “downlink signal” indicates that the transmission direction of the signal is the first direction.
  • the term “and/or” is only an association relationship describing associated objects, indicating that there may be three relationships. Specifically, A and/or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or” relationship.
  • Fig. 9 is a schematic diagram of the structural composition of the variable maintenance device provided by the embodiment of the present application, which is applied to terminal equipment. As shown in Fig. 9, the variable maintenance device includes:
  • the receiving unit 901 is configured to receive first configuration information sent by a network device, where the first configuration information is used to determine a first offset value between a first variable and a second variable; wherein, the first variable and the The second variable is a variable related to the receiving window;
  • the determining unit 902 is configured to determine a value of the first variable, and determine a value of the second variable based on the value of the first variable and the first offset value.
  • the receiving window is a PDCP receiving window
  • the first variable is used to indicate a first COUNT value, and the first COUNT value refers to the COUNT value associated with the next data packet expected to be received;
  • the second variable is used to indicate a second COUNT value, and the second COUNT value refers to the COUNT value associated with the first data packet not delivered to the upper layer.
  • the first COUNT value includes the first HFN and the first SN
  • the determining unit 902 is configured to determine the initial value of the first HFN based on the second configuration information sent by the network device, and determine the initial value of the first HFN based on the SN of the first data packet received by the terminal device. initial value.
  • the initial value of the first SN is:
  • x is the SN value of the first data packet received by the terminal device
  • PDCP-SN-Size is the number of SN values supported by the PDCP entity
  • Mod is a remainder operation.
  • the second COUNT value includes a second HFN and a second SN
  • the determining unit 902 is configured to determine an initial value of the second HFN based on the initial value of the first HFN, and determine the second HFN based on the initial value of the first SN and the first offset value. The initial value of SN.
  • the determining unit 902 determines that the initial value of the second SN is equal to 0, and determines that the The initial value of the second HFN is equal to the initial value of the first HFN;
  • the determining unit 902 determines that the initial value of the second SN is equal to the initial value of the first SN minus the first offset value an offset value, and determining that the initial value of the second HFN is equal to the initial value of the first HFN.
  • the determining unit 902 determines that the initial value of the second SN is equal to the initial value of the first SN value minus the first offset value plus the size of the PDCP receiving window, and determining that the initial value of the second HFN is equal to the initial value of the first HFN minus 1;
  • the determining unit 902 determines that the initial value of the second SN is equal to the initial value of the first SN minus the first offset value an offset value, and determining that the initial value of the second HFN is equal to the initial value of the first HFN.
  • the receiving window is an RLC receiving window
  • the first variable is used to indicate the third SN, the third SN refers to the SN behind the SN of the first data packet, and the first data packet is the data packet with the highest SN among the received data packets;
  • the second variable is used to indicate the fourth SN, and the fourth SN refers to the earliest SN that has not completely received the data packet.
  • the determining unit 902 is configured to determine the initial value of the third SN based on the SN of the first data packet received by the terminal device.
  • the initial value of the third SN is the value of the SN of the first data packet received by the terminal device.
  • the determining unit 902 is configured to determine the initial value of the fourth SN based on the initial value of the third SN and the first offset value.
  • the determining unit 902 determines that the initial value of the fourth SN is equal to 0;
  • the determination unit 902 determines that the initial value of the fourth SN is equal to the initial value of the third SN minus the the first offset value.
  • the determining unit 902 determines that the initial value of the fourth SN is equal to the third SN The initial value minus the first offset value plus the size of the RLC receiving window;
  • the determination unit 902 determines that the initial value of the fourth SN is equal to the initial value of the third SN minus the the first offset value.
  • the RLC entity of the terminal device is in an unacknowledged mode or an acknowledged mode.
  • the receiving unit 901 is further configured to receive third configuration information sent by the network device, where the third configuration information is used to determine the duration of the first timer or the threshold of the first counter;
  • the apparatus further includes: an updating unit 903, configured to update the RLC receiving window based on the first timer or the first counter.
  • the device further includes: a control unit, configured to start the first timer after the receiving unit 901 receives the third configuration information;
  • the updating unit 903 is configured to update the RLC receiving window based on the SN of the latest received data packet if the first timer expires, or determine that the data packets outside the RLC receiving window are The valid data packet updates the RLC receiving window based on the SN of the valid data packet.
  • control unit is further configured to restart the first timer after the RLC layer of the terminal device receives the data packet from the MAC layer.
  • control unit is further configured to restart the first timer after the updating unit finishes updating the RLC receiving window.
  • the device further includes: a control unit, configured to start the first counter after the receiving unit 901 receives the third configuration information; After receiving a data packet outside the RLC receiving window, control the value of the first counter to add 1;
  • the updating unit 903 is configured to update the RLC receiving window based on the SN of the latest received data packet if the value of the first counter is greater than or equal to the threshold of the first counter, or determine the The data packets outside the RLC receiving window are valid data packets, and the RLC receiving window is updated based on the SN of the valid data packets.
  • control unit is further configured to reset the first counter after the updating unit finishes updating the RLC receiving window.
  • the receiving unit 901 is further configured to receive a multicast-type MBS service based on the value of the first variable and the value of the second variable.
  • variable maintenance device in the embodiment of the present application can be understood with reference to the relevant description of the variable maintenance method in the embodiment of the present application.
  • Fig. 10 is a schematic structural diagram of a communication device 1000 provided by an embodiment of the present application.
  • the communication device may be a terminal device or a network device.
  • the communication device 1000 shown in FIG. 10 includes a processor 1010, and the processor 1010 can invoke and run a computer program from a memory, so as to implement the method in the embodiment of the present application.
  • the communication device 1000 may further include a memory 1020 .
  • the processor 1010 can invoke and run a computer program from the memory 1020, so as to implement the method in the embodiment of the present application.
  • the memory 1020 may be an independent device independent of the processor 1010 , or may be integrated in the processor 1010 .
  • the communication device 1000 may further include a transceiver 1030, and the processor 1010 may control the transceiver 1030 to communicate with other devices, specifically, to send information or data to other devices, or receive other Information or data sent by the device.
  • the processor 1010 may control the transceiver 1030 to communicate with other devices, specifically, to send information or data to other devices, or receive other Information or data sent by the device.
  • the transceiver 1030 may include a transmitter and a receiver.
  • the transceiver 1030 may further include antennas, and the number of antennas may be one or more.
  • the communication device 1000 may specifically be the network device of the embodiment of the present application, and the communication device 1000 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, details are not repeated here. .
  • the communication device 1000 may specifically be the mobile terminal/terminal device of the embodiment of the present application, and the communication device 1000 may implement the corresponding processes implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, for the sake of brevity , which will not be repeated here.
  • FIG. 11 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • the chip 1100 shown in FIG. 11 includes a processor 1110, and the processor 1110 can call and run a computer program from a memory, so as to implement the method in the embodiment of the present application.
  • the chip 1100 may further include a memory 1120 .
  • the processor 1110 can invoke and run a computer program from the memory 1120, so as to implement the method in the embodiment of the present application.
  • the memory 1120 may be an independent device independent of the processor 1110 , or may be integrated in the processor 1110 .
  • the chip 1100 may also include an input interface 1130 .
  • the processor 1110 can control the input interface 1130 to communicate with other devices or chips, specifically, can obtain information or data sent by other devices or chips.
  • the chip 1100 may also include an output interface 1140 .
  • the processor 1110 can control the output interface 1140 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the network device in the methods of the embodiment of the present application.
  • the chip can implement the corresponding processes implemented by the network device in the methods of the embodiment of the present application.
  • the chip can be applied to the mobile terminal/terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal/terminal device in the various methods of the embodiments of the present application.
  • the chip can implement the corresponding processes implemented by the mobile terminal/terminal device in the various methods of the embodiments of the present application.
  • the chip can implement the corresponding processes implemented by the mobile terminal/terminal device in the various methods of the embodiments of the present application.
  • the chip can be applied to the mobile terminal/terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal/terminal device in the various methods of the embodiments of the present application.
  • the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.
  • Fig. 12 is a schematic block diagram of a communication system 1200 provided by an embodiment of the present application. As shown in FIG. 12 , the communication system 1200 includes a terminal device 1210 and a network device 1220 .
  • the terminal device 1210 can be used to realize the corresponding functions realized by the terminal device in the above method
  • the network device 1220 can be used to realize the corresponding functions realized by the network device in the above method.
  • the processor in the embodiment of the present application may be an integrated circuit chip, which has a signal processing capability.
  • each step of the above-mentioned method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the above-mentioned processor can 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 available Program logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • the steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register.
  • the storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically programmable Erase Programmable Read-Only Memory (Electrically EPROM, EEPROM) or Flash.
  • the volatile memory can be Random Access Memory (RAM), which acts as external cache memory.
  • RAM Static Random Access Memory
  • SRAM Static Random Access Memory
  • DRAM Dynamic Random Access Memory
  • Synchronous Dynamic Random Access Memory Synchronous Dynamic Random Access Memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM, DDR SDRAM enhanced synchronous dynamic random access memory
  • Enhanced SDRAM, ESDRAM synchronous connection dynamic random access memory
  • Synchlink DRAM, SLDRAM Direct Memory Bus Random Access Memory
  • Direct Rambus RAM Direct Rambus RAM
  • the memory in the embodiment of the present application may also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is, the memory in the embodiments of the present application is intended to include, but not be limited to, these and any other suitable types of memory.
  • the embodiment of the present application also provides a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the methods of the embodiments of the present application.
  • the computer program enables the computer to execute the corresponding processes implemented by the network device in the methods of the embodiments of the present application.
  • the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the various methods of the embodiments of the present application , for the sake of brevity, it is not repeated here.
  • the embodiment of the present application also provides a computer program product, including computer program instructions.
  • the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the Let me repeat for the sake of brevity, the Let me repeat.
  • the computer program product can be applied to the mobile terminal/terminal device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the methods of the embodiments of the present application, For the sake of brevity, details are not repeated here.
  • the embodiment of the present application also provides a computer program.
  • the computer program can be applied to the network device in the embodiment of the present application.
  • the computer program executes the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program executes the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program can be applied to the mobile terminal/terminal device in the embodiment of the present application.
  • the computer program executes each method in the embodiment of the present application to be implemented by the mobile terminal/terminal device
  • the corresponding process will not be repeated here.
  • the disclosed systems, devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disc, etc., which can store program codes. .

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Abstract

本申请实施例提供一种变量的维护方法及装置、终端设备，该方法包括：终端设备接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量；所述终端设备确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。

Description

一种变量的维护方法及装置、终端设备 技术领域
本申请实施例涉及移动通信技术领域，具体涉及一种变量的维护方法及装置、终端设备。
背景技术
在新无线(New Radio，NR)系统中，支持组播类型的多播广播服务(Multicast Broadcast Service，MBS)业务。终端设备在无线资源控制(Radio Resource Control，RRC)连接状态下接收组播类型的MBS业务。终端设备可以通过点对多点(Point To MultiPoint，PTM)方式或者点对点(Point To Point，PTP)方式接收组播类型的MBS业务。
对于组播类型的MBS业务来说，MBS业务是发给某个组中的所有终端设备。对于这种场景，终端设备侧的接收窗口相关的变量如何进行维护以确保数据包能够正常接收，是个需要解决的问题。
发明内容
本申请实施例提供一种变量的维护方法及装置、终端设备、芯片、计算机可读存储介质、计算机程序产品、计算机程序。
本申请实施例提供的变量的维护方法，包括：
终端设备接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量；
所述终端设备确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。
本申请实施例提供的变量的维护装置，应用于终端设备，所述装置包括：
接收单元，用于接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量；
确定单元，用于确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。
本申请实施例提供的终端设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，执行上述的变量的维护方法。
本申请实施例提供的网络设备，可以是上述方案中的第一设备或者是上述方案中的第二设备，该通信设备包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，执行上述的变量的维护方法。
本申请实施例提供的芯片，用于实现上述的变量的维护方法。
具体地，该芯片包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有该芯片的设备执行上述的变量的维护方法。
本申请实施例提供的计算机可读存储介质，用于存储计算机程序，该计算机程序使得计算机执行上述的变量的维护方法。
本申请实施例提供的计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行上述的变量的维护方法。
本申请实施例提供的计算机程序，当其在计算机上运行时，使得计算机执行上述的变量的维护方法。
通过上述技术方案，网络设备为终端设备配置第一偏置值，终端设备确定第一变量的值，基于所述第一变量的值和所述第一偏置值确定第二变量的值，其中，所述第一变量和所述第二变量为接收窗口相关的变量，如此，明确了终端设备如何维护与接收窗口相关的第一变量和第二变量，从而为终端设备正常接收数据包提供了保障，使得数据包的丢失尽可能少，提高了数据包的传输可靠性。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是本申请实施例的一个应用场景的示意图；
图2是本申请实施例的PTM方式和PTP方式对应的协议栈的示意图；
图3是本申请实施例提供的MBS业务按照PTM方式和PTP方式传输的示意图；
图4-1是本申请实施例提供的PDCP接收窗口关联的变量的取值示意图一；
图4-2是本申请实施例提供的RLC接收窗口关联的变量的取值示意图一；
图5是本申请实施例提供的变量的维护方法的流程示意图；
图6-1是本申请实施例提供的PDCP接收窗口关联的变量的取值示意图二；
图6-2是本申请实施例提供的PDCP接收窗口关联的变量的取值示意图三；
图7-1是本申请实施例提供的RLC接收窗口关联的变量的取值示意图二；
图7-2是本申请实施例提供的RLC接收窗口关联的变量的取值示意图三；
图8是本申请实施例提供的RLC接收窗口的更新示意图；
图9是本申请实施例提供的变量的维护装置的结构组成示意图；
图10是本申请实施例提供的一种通信设备示意性结构图；
图11是本申请实施例的芯片的示意性结构图；
图12是本申请实施例提供的一种通信系统的示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
图1是本申请实施例的一个应用场景的示意图。
如图1所示，通信系统100可以包括终端设备110和网络设备120。网络设备120可以通过空口与终端设备110通信。终端设备110和网络设备120之间支持多业务传输。
应理解，本申请实施例仅以通信系统100进行示例性说明，但本申请实施例不限定于此。也就是说，本申请实施例的技术方案可以应用于各种通信系统，例如：长期演进(Long Term Evolution，LTE)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、物联网(Internet of Things，IoT)系统、窄带物联网(Narrow Band Internet of Things，NB-IoT)系统、增强的机器类型通信(enhanced Machine-Type Communications，eMTC)系统、5G通信系统(也称为新无线(New Radio，NR)通信系统)，或未来的通信系统等。
在图1所示的通信系统100中，网络设备120可以是与终端设备110通信的接入网设备。接入网设备可以为特定的地理区域提供通信覆盖，并且可以与位于该覆盖区域内的终端设备110(例如UE)进行通信。
网络设备120可以是长期演进(Long Term Evolution，LTE)系统中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者是下一代无线接入网(Next Generation Radio Access Network，NG RAN)设备，或者是NR系统中的基站(gNB)，或者是云无线接入网络(Cloud Radio Access Network，CRAN)中的无线控制器，或者该网络设备120可以为中继站、接入点、车载设备、可穿戴设备、集线器、交换机、网桥、路由器，或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)中的网络设备等。
终端设备110可以是任意终端设备，其包括但不限于与网络设备120或其它终端设备采用有线或者无线连接的终端设备。
例如，所述终端设备110可以指接入终端、用户设备(User Equipment，UE)、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。接入终端可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、IoT设备、卫星手持终端、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备、5G网络中的终端设备或者未来演进网络中的终端设备等。
终端设备110可以用于设备到设备(Device to Device，D2D)的通信。
无线通信系统100还可以包括与基站进行通信的核心网设备130，该核心网设备130可以是5G核心网(5G Core，5GC)设备，例如，接入与移动性管理功能(Access and Mobility Management Function，AMF)，又例如，认证服务器功能(Authentication Server Function，AUSF)，又例如，用户面功能(User Plane Function，UPF)，又例如，会话管理功能(Session Management Function，SMF)。可选地，核心网络设备130也可以是LTE网络的分组核心演进(Evolved Packet Core，EPC)设备，例如，会话管理功能+核心网络的数据网关(Session Management Function+Core Packet Gateway，SMF+PGW-C)设备。应理解，SMF+PGW-C可以同时实现SMF和PGW-C所能实现的功能。在网络演进过程中，上述核心网设备也有可能叫其它名字，或者通过对核心网的功能进行划分形成新的网络实体，对此本申请实施例不做限制。
通信系统100中的各个功能单元之间还可以通过下一代网络(next generation，NG)接口建立连接实现通信。
例如，终端设备通过NR接口与接入网设备建立空口连接，用于传输用户面数据和控制面信令；终端设备可以通过NG接口1(简称N1)与AMF建立控制面信令连接；接入网设备例如下一代无线接入基站(gNB)，可以通过NG接口3(简称N3)与UPF建立用户面数据连接；接入网设备可以通过NG接口2(简称N2)与AMF建立控制面信令连接；UPF可以通过NG接口4(简称N4)与SMF建立控制面信令连接；UPF可以通过NG接口6(简称N6)与数据网络交互用户面数据；AMF可以通过NG接口11(简称N11)与SMF建立控制面信令连接；SMF可以通过NG接口7(简称N7)与PCF建立控制面信令连接。
图1示例性地示出了一个基站、一个核心网设备和两个终端设备，可选地，该无线通信系统100可以包括多个基站设备并且每个基站的覆盖范围内可以包括其它数量的终端设备，本申请实施例对此不做限定。
需要说明的是，图1只是以示例的形式示意本申请所适用的系统，当然，本申请实施例所示的方法还可以适用于其它系统。此外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。还应理解，在本申请的实施例中提到的“指示”可以是直接指示，也可以是间接指示，还可以是表示具有关联关系。举例说明，A指示B，可以表示A直接指示B，例如B可以通过A获取；也可以表示A间接指示B，例如A指示C，B可以通过C获取；还可以表示A和B之间具有关联关系。还应理解，在本申请的实施例中提到的“对应”可表示两者之间具有直接对应或间接对应的关系，也可以表示两者之间具有关联关系，也可以是指示与被指示、配置与被配置等关系。还应理解，在本申请的实施例中提到的“预定义”或“预定义规则”可以通过在设备(例如，包括终端设备和网络设备)中预先保存相应的代码、表格或其他可用于指示相关信息的方式来实现，本申请对于其具体的实现方式不做限定。比如预定义可以是指协议中定义的。还应理解，本申请实施例中，所述"协议"可以指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
为便于理解本申请实施例的技术方案，以下对本申请实施例的相关技术进行说明，以下相关技术作为可选方案与本申请实施例的技术方案可以进行任意结合，其均属于本申请实施例的保护范围。
随着人们对速率、延迟、高速移动性、能效的追求以及未来生活中业务的多样性、复杂性，为此第三代合作伙伴计划(3 rd Generation Partnership Project，3GPP)国际标准组织开始研发5G。5G的主要应用场景为：增强移动超宽带(enhanced Mobile Broadband，eMBB)、低时延高可靠通信(Ultra-Reliable Low-Latency Communications，URLLC)、大规模机器类通信(massive Machine-Type Communications，mMTC)。
一方面，eMBB仍然以用户获得多媒体内容、服务和数据为目标，其需求增长十分迅速。另一方面，由于eMBB可能部署在不同的场景中，例如室内，市区，农村等，其能力和需求的差别也比较大，所以不能一概而论，必须结合具体的部署场景详细分析。URLLC的典型应用包括：工业自动化，电力自动化，远程医疗操作(手术)，交通安全保障等。mMTC的典型特点包括：高连接密度，小数据量，时延不敏感业务，模块的低成本和长使用寿命等。
在NR早期部署时，完整的NR覆盖很难获取，所以典型的网络覆盖是广域的LTE覆盖和NR的孤岛覆盖模式。而且大量的LTE部署在6GHz以下，可用于5G的6GHz以下频谱很少。所以NR必须研究6GHz以上的频谱应用，而高频段覆盖有限、信号衰落快。同时为了保护移动运营商前期 在LTE投资，提出了LTE和NR之间紧耦合(tight interworking)的工作模式。
RRC状态
5G为了降低空口信令和快速恢复无线连接，快速恢复数据业务的目的，定义了一个新的无线资源控制(Radio Resource Control，RRC)状态，即RRC非激活(RRC_INACTIVE)状态。这种状态有别于RRC空闲(RRC_IDLE)状态和RRC激活(RRC_ACTIVE)状态。其中，
1)RRC_IDLE状态(简称为空闲(idle)态)：移动性为基于UE的小区选择重选，寻呼由核心网(Core Network，CN)发起，寻呼区域由CN配置。基站侧不存在UE上下文，不存在RRC连接。
2)RRC_CONNECTED状态(简称为连接(connected)态)：存在RRC连接，基站侧和UE侧存在UE上下文。网络侧知道UE的位置是具体小区级别的。移动性是网络侧控制的移动性。UE和基站之间可以传输单播数据。
3)RRC_INACTIVE状态(简称为非激活(inactive)态)：移动性为基于UE的小区选择重选，存在CN-NR之间的连接，UE上下文存在某个基站上，寻呼由RAN触发，基于RAN的寻呼区域由RAN管理，网络侧知道UE的位置是基于RAN的寻呼区域级别的。
多媒体广播多播服务(Multimedia Broadcast Multicast Service，MBMS)
MBMS是一种通过共享网络资源从一个数据源向多个终端设备传送数据的技术，该技术在提供多媒体业务的同时能有效地利用网络资源，实现较高速率(如256kbps)的多媒体业务的广播和组播。
由于MBMS频谱效率较低，不足以有效地承载和支撑手机电视类型业务的运营。因此在LTE中，3GPP明确提出增强对下行高速MBMS业务的支持能力，并确定了对物理层和空中接口的设计要求。
3GPP R9将演进的MBMS(evolved MBMS，eMBMS)引入到LTE中。eMBMS提出了单频率网络(Single Frequency Network，SFN)的概念，即多媒体广播多播服务单频率网络(Multimedia Broadcast multicast service Single Frequency Network，MBSFN)，MBSFN采用统一频率在所有小区同时发送业务数据，但是要保证小区间的同步。这种方式可以极大的提高小区整体信噪比分布，频谱效率也会相应的大幅提高。eMBMS基于IP多播协议实现业务的广播和多播。
在LTE或增强的LTE(LTE-Advanced，LTE-A)中，MBMS只有广播承载模式，没有多播承载模式。此外，MBMS业务的接收适用于空闲态或者连接态的终端设备。
3GPP R13中引入了单小区点对多点(Single Cell Point To Multiploint，SC-PTM)概念，SC-PTM基于MBMS网络架构。
MBMS引入了新的逻辑信道，包括单小区多播控制信道(Single Cell-Multicast Control Channel，SC-MCCH)和单小区多播传输信道(Single Cell-Multicast Transport Channel，SC-MTCH)。SC-MCCH和SC-MTCH被映射到下行共享信道(Downlink-Shared Channel，DL-SCH)上，进一步，DL-SCH被映射到物理下行共享信道(Physical Downlink Shared Channel，PDSCH)上，其中，SC-MCCH和SC-MTCH属于逻辑信道，DL-SCH属于传输信道，PDSCH属于物理信道。SC-MCCH和SC-MTCH不支持混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)操作。
MBMS引入了新的系统信息块(System Information Block，SIB)类型，即SIB20。具体地，通过SIB20来传输SC-MCCH的配置信息，一个小区只有一个SC-MCCH。SC-MCCH的配置信息包括：SC-MCCH的修改周期、SC-MCCH的重复周期、以及调度SC-MCCH的无线帧和子帧等信息。进一步，1)SC-MCCH的修改周期的边界满足SFN mod m＝0，其中，SFN代表边界的系统帧号，m是SIB20中配置的SC-MCCH的修改周期(即sc-mcch-ModificationPeriod)。2)调度SC-MCCH的无线帧满足：SFN mod mcch-RepetitionPeriod＝mcch-Offset，其中，SFN代表无线帧的系统帧号，mcch-RepetitionPeriod代表SC-MCCH的重复周期，mcch-Offset代表SC-MCCH的偏移量。3)调度SC-MCCH的子帧通过sc-mcch-Subframe指示。
SC-MCCH通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)调度。一方面，引入新的无线网络临时标识(Radio Network Tempory Identity，RNTI)，即单小区RNTI(Single Cell RNTI，SC-RNTI)来识别用于调度SC-MCCH的PDCCH(如SC-MCCH PDCCH)，可选地，SC-RNTI固定取值为FFFC。另一方面，引入新的RNTI，即单小区通知RNTI(Single Cell Notification RNTI，SC-N-RNTI)来识别用于指示SC-MCCH的变更通知的PDCCH(如通知PDCCH)，可选地，SC-N-RNTI固定取值为FFFB；进一步，可以用DCI 1C的8个比特(bit)中的一个bit来指示变更通知。在LTE中，SC-PTM的配置信息基于SIB20配置的SC-MCCH，然后SC-MCCH配置SC-MTCH，SC-MTCH用于传输业务数据。
具体地，SC-MCCH只传输一个消息(即SCPTMConfiguration)，该消息用于配置SC-PTM的配置信息。SC-PTM的配置信息包括：临时移动组标识(Temporary Mobile Group Identity，TMGI)、会话标识(seession id)、组RNTI(Group RNTI，G-RNTI)、非连续接收(Discontinuous Reception，DRX)配置信息以及邻区的SC-PTM业务信息等。需要说明的是，R13中的SC-PTM不支持健壮性包头压缩(Robust Header Compression，ROHC)功能。
SC-PTM的下行非连续的接收是通过以下参数控制的：onDurationTimerSCPTM、drx-InactivityTimerSCPTM、SC-MTCH-SchedulingCycle、以及SC-MTCH-SchedulingOffset。
当满足[(SFN*10)+subframe number]modulo(SC-MTCH-SchedulingCycle)＝SC-MTCH-SchedulingOffset时，启动定时器onDurationTimerSCPTM；
当接收到下行PDCCH调度时，启动定时器drx-InactivityTimerSCPTM；
只有当定时器onDurationTimerSCPTM或drx-InactivityTimerSCPTM运行时才接收下行SC-PTM业务。
SC-PTM业务连续性采用基于SIB15的MBMS业务连续性概念，即“SIB15+MBMSInterestIndication”方式。空闲态的终端设备的业务连续性基于频率优先级的概念。
需要说明的是，上述方案虽然是以MBMS业务为例进行说明的，但本申请实施例的技术方案不局限于此。本申请实施例以MBS业务为例进行说明，“MBS业务”的描述也可以被替换为“MBMS业务”。
在NR系统中，很多场景需要支持组播类型和广播类型的业务需求，例如车联网中，工业互联网中等。所以在NR中引入组播类型和广播类型的MBS业务是有必要的。需要说明的是，组播类型的MBS业务是指通过组播方式传输的MBS业务。广播类型的MBS业务是指通过广播方式传输的MBS业务。
在NR系统中，对于组播类型的MBS业务来说，MBS业务是发给某个组中的所有终端设备。终端设备在RRC连接状态下接收组播类型的MBS业务，终端设备可以通过PTM方式或者PTP方式接收组播类型的MBS业务数据。其中，参照图2，PTM方式的MBS业务数据通过网络侧配置的G-RNTI来加扰对应的调度信息，PTP方式的MBS业务数据通过C-RNTI来加扰对应的调度信息。
对于组播类型的MBS业务来说，基站从共享隧道(tunnel)接收核心网下发的MBS业务后，可以将该MSB业务通过空口下发给一个组中的所有终端设备。这里，基站可以通过PTP方式和/或PTM方式将MSB业务下发给一个组中的所有终端设备。例如：一个组包括终端设备1、终端设备2和终端设备3，基站可以通过PTP方式将MBS业务下发给终端设备1，通过PTP方式将MBS业务下发给终端设备2，通过PTP方式将MBS业务下发给终端设备3；或者，基站可以通过PTP方式将MBS业务下发给终端设备1，通过PTM方式将MBS业务下发给终端设备2和终端设备3；或者，基站可以通过PTM方式将MBS业务下发给终端设备1，终端设备2以及终端设备3。参照图3，在核心网到基站之间采用一个共享的GTP隧道(Shared GTP tunnel)来传输MBS业务，即无论是PTM方式的MBS业务还是PTP方式的MBS业务都是共享这个GTP隧道的。基站按照PTM方式下发MBS业务数据给UE1和UE2，以及按照PTP方式下发MBS业务数据给UE3。
接收窗口关联的变量
对于组播类型的MBS业务来说，尤其对于PTM方式的组播类型的MBS业务来说，MBS组内的多个终端设备都接收MBS业务。终端设备对于接收窗口关联的变量(简称为接收窗口变量)的维护，MBS业务和单播业务需要有所不同，例如：MBS业务的接收窗口变量的初始值和单播业务的接收窗口变量的初始值不同。
对于分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)实体来说，对应的接收窗口称为PDCP接收窗口，PDCP接收窗口关联的变量主要包括：RX_NEXT和RX_DELIV。
对于线链路层控制(Radio Link Control，RLC)实体来说，对应的接收窗口称为RLC接收窗口。对于非确认模式(UM)来说，RLC接收窗口关联的变量主要包括：RX_Next_Highest和RX_Next_Reassembly。对于确认模式(AM)来说，RLC接收窗口关联的变量主要包括：RX_Next_Highest和RX_Next。
在一些实现方式中，RX_NEXT和RX_DELIV的初始值为0，如图4-1。
在一些实现方式中，RX_Next_Highest和RX_Next_Reassembly的初始值为0，如图4-2。
然而，将接收窗口关联的变量的初始值设置为0，并不适用于组播类型的MSB业务，更不适用于PTM方式的组播类型的MBS业务，因为MBS业务的接收端有多个终端设备，MBS业务不会因为某个终端设备的接收而调整其传输进度，如果终端设备将接收窗口关联的变量的初始值设置为0， 会出现无法正常接收MBS业务的问题。
在一些实现方式中，RX_NEXT和RX_DELIV中的序列号(Serial Number，SN)部分的初始值基于终端设备接收到第一个数据包的SN确定。同样，RX_Next_Highest和RX_Next_Reassembly的初始值也基于终端设备接收到第一个数据包的SN确定。然而，对于组播类型的MSB业务来说，尤其对于PTM方式的组播类型的MBS业务来说，会存在丢包率较高的问题，因为如果终端设备接收到的数据包的SN小于变量中SN部分的值或者变量的值，则该数据包会被丢弃。
为此，需要提出一种全新的方案来维护接收窗口的变量。
为便于理解本申请实施例的技术方案，以下通过具体实施例详述本申请的技术方案。以上相关技术作为可选方案与本申请实施例的技术方案可以进行任意结合，其均属于本申请实施例的保护范围。本申请实施例包括以下内容中的至少部分内容。
图5是本申请实施例提供的变量的维护方法的流程示意图，如图5所示，所述变量的维护方法包括以下步骤：
步骤501：终端设备接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量。
在一些可选实施方式中，所述网络设备可以是基站。
在一些可选实施方式中，所述第一配置信息通过RRC专用信令进行配置。
步骤502：所述终端设备确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。
本申请实施例中，所述接收窗口为PDCP接收窗口或者RLC接收窗口，以下分别结合PDCP接收窗口和RLC接收窗口对本申请实施例的技术方案进行描述。
方案一：PDCP接收窗口
在一些可选实施方式中，所述接收窗口为PDCP接收窗口，所述第一变量用于指示第一计数(COUNT)值，所述第一COUNT值是指期望接收的下一个数据包关联的COUNT值；所述第二变量用于指示第二COUNT值，所述第二COUNT值是指未递交给上层的第一个数据包关联的COUNT值。这里，数据包是指PDCP SDU。
在一些可选实施方式中，所述第一变量记为RX_NEXT，所述第二变量记为RX_DELIV。
本申请实施例中，COUNT值是一个N比特的数值，N为正整数，作为示例，N＝32。COUNT值由两部分组成，分别为超帧号(HFN)和序列号(SN)，其中，HFN的比特长度＝N-SN的比特长度。需要说明的是，COUNT值不在信道上传输，COUNT值由终端设备进行维护，也即COUNT值中的HFN和SN由终端设备进行维护。
对于第一变量指示的第一COUNT值来说，所述第一COUNT值包括第一HFN和第一SN。对于第二变量指示的第二COUNT值来说，所述第二COUNT值包括第二HFN和第二SN。以下对终端设备如何维护所述第一COUNT值和所述第二COUNT值进行说明。需要说明的是，针对第一COUNT值的维护，可以理解为针对第一变量的维护，同样，针对第二COUNT值的维护，可以理解为针对第二变量的维护。
1)第一变量的维护
本申请实施例中，所述终端设备基于网络设备发送的第二配置信息确定所述第一HFN的初始值，以及基于所述终端设备接收到的第一个数据包的SN确定所述第一SN的初始值。
在一些可选实施方式中，所述第二配置信息通过RRC专用信令进行配置。终端设备通过RRC专用信令可以获得第一HFN的初始值。
这里，数据包的SN携带在数据包的包头中，终端设备可以通过解析数据包的包头来获得该数据包的SN，进而根据该数据包的SN确定第一SN的初始值。
在一些可选实施方式中，所述第一SN的初始值为：
(x+1)Mod(2 [PDCP-SN-Size])；
其中，x为所述终端设备接收到的第一个数据包的SN的值，PDCP-SN-Size为PDCP实体支持的SN取值的数量，Mod为取余运算。
2)第二变量的维护
本申请实施例中，所述终端设备基于所述第一HFN的初始值确定所述第二HFN的初始值，以及基于所述第一SN的初始值和所述第一偏置值确定所述第二SN的初始值。
这里，所述第一偏置值也可以称为PDCP SN偏置(PDCP SN offset)值。
在一些可选实施方式中，若所述第一SN的初始值减去所述第一偏置值小于0，则所述终端设备 确定所述第二SN的初始值等于0，以及确定所述第二HFN的初始值等于所述第一HFN的初始值；若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
在一些可选实施方式中，若所述第一SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值再加上PDCP接收窗口的大小，以及确定所述第二HFN的初始值等于所述第一HFN的初始值减1；若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
方案二：RLC接收窗口
在一些可选实施方式中，所述接收窗口为RLC接收窗口，所述第一变量用于指示第三SN，所述第三SN是指位于第一数据包的SN后面的SN，所述第一数据包为接收到的数据包中具有最高SN的数据包；所述第二变量用于指示第四SN，所述第四SN是指最早一个没有完整接收到的数据包的SN。
本申请实施例中，所述终端设备的RLC实体处于UM或者AM。处于UM的RLC实体也可以称为UM RLC实体，处于AM的RLC实体也可以称为AM RLC实体。对于UM来说，上述方案中的数据包是指UMD PDU，对于AM来说，上述方案中的数据包是指AMD PDU
在一些可选实施方式中，对于UM来说，所述第一变量记为RX_Next_Highest，所述第二变量记为RX_Next_Reassembly。对于AM来说，所述第一变量记为RX_Next_Highest，所述第二变量记为RX_Next。
以下对终端设备如何维护所述第三SN和所述第四SN进行说明。需要说明的是，针对第三SN的维护，可以理解为针对第一变量的维护，同样，针对第四SN的维护，可以理解为针对第二变量的维护。
1)第一变量的维护
本申请实施例中，所述终端设备基于所述终端设备接收到的第一个数据包的SN确定所述第三SN的初始值。
这里，数据包的SN携带在数据包的包头中，终端设备可以通过解析数据包的包头来获得该数据包的SN，进而根据该数据包的SN确定第三SN的初始值。
在一些可选实施方式中，所述第三SN的初始值为所述所述终端设备接收到的第一个数据包的SN的值。
2)第二变量的维护
本申请实施例中，所述终端设备基于所述第三SN的初始值和所述第一偏置值确定所述第四SN的初始值。
这里，所述第一偏置值可以称为RLC SN偏置(RLC SN offset)值。
在一些可选实施方式中，若所述第三SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第四SN的初始值等于0；若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
在一些可选实施方式中，若所述第三SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值再加上RLC接收窗口的大小；若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
方案三：RLC接收窗口的更新
本申请实施例中，所述终端设备的RLC实体处于确认模式的情况下，所述终端设备接收网络设备发送的第三配置信息，所述第三配置信息用于确定第一定时器的时长或者第一计数器的门限；所述终端设备基于所述第一定时器或者所述第一计数器，对所述RLC接收窗口进行更新。
在一些可选实施方式中，所述第三配置信息通过RRC专用信令进行配置。
本申请实施例中，RLC实体处于确认模式的情况下，终端设备只有在数据包正确接收的情况下，才会对RLC接收窗口进行更新，如果有数据包多次无法正确接收，终端设备不会对RLC接收窗口进行更新，导致RLC接收窗口出现停滞或者说卡死的情况出现，对于MBS业务来说，就会出现大量的丢包现象。为此，网络设备通过配置第一定时器或者第一计数器，来触发终端设备更新RLC接收窗口，避免RLC接收窗口出现停滞或者说卡死的风险。以下结合第一定时器和第一计数器对如何 更新RLC接收窗口进行说明。
1)基于第一定时器对RLC接收窗口进行更新
本申请实施例中，所述终端设备接收到所述第三配置信息后，启动所述第一定时器；若所述第一定时器超时，则所述终端设备基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，所述终端设备确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
在一些可选实施方式中，所述终端设备的RLC层接收到来自MAC层的数据包后，重启所述第一定时器。
在一些可选实施方式中，所述终端设备更新完所述RLC接收窗口后，重启所述第一定时器。
2)基于第一计数器对RLC接收窗口进行更新
本申请实施例中，所述终端设备接收到所述第三配置信息后，启动所述第一计数器；所述终端设备每次接收到一个所述RLC接收窗口之外的数据包后，控制所述第一计数器的值加1；若所述第一计数器的值大于或等于所述第一计数器的门限，则所述终端设备基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，所述终端设备确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
在一些可选实施方式中，所述终端设备更新完所述RLC接收窗口后，重置所述第一计数器。
本申请实施例的技术方案，终端设备基于所述第一变量的值和所述第二变量的值，接收组播类型的MBS业务，尤其接收PTM方式的组播类型的MBS业务，保障了终端设备正常接收数据包，使得数据包的丢失尽可能少，提高了数据包的传输可靠性。
以下结合具体应用实例对本申请实施例的技术方案进行举例说明。
应用实例一
PDCP接收窗口关联的变量包括RX_NEXT和RX_DELIV。其中，RX_NEXT用于指示期望接收的下一个数据包关联的COUNT值，称为第一COUNT值。RX_DELIV用于指示未递交给上层的第一个数据包关联的COUNT值，称为第二COUNT值。
对于RX_NEXT指示的第一COUNT值来说，包括第一HFN和第一SN。对于RX_DELIV指示的第二COUNT值来说，包括第二HFN和第二SN。
基站通过RRC专用信令为MBS业务配置用于PDCP接收的HFN的值，该HFN的值作为RX_NEXT对应的第一HFN的初始值。
终端设备根据接收到的第一个数据包的SN确定RX_NEXT对应的第一SN的初始值。
终端设备确定出了第一HFN的初始值和第一SN的初始值，也即确定出了第一COUNT值的初始值，也即确定出了RX_NEXT的初始值。
基站通过RRC专用信令为MBS业务配置用于PDCP接收的PDCP SN偏置值。这里，PDCP SN偏置值为RX_NEXT对应的第一SN和RX_DELIV对应的第二SN的SN差值。
终端设备通过以下方式确定RX_DELIV对应的第二HFN和第二SN的初始值。
方式一：
如果第一SN的初始值减去PDCP SN偏置值小于0，则确定第二SN的初始值等于0，以及第二HFN的初始值等于第一HFN的初始值。
如果第一SN的初始值减去PDCP SN偏置值大于或等于0，则确定第二SN的初始值等于第一SN的初始值减去PDCP SN偏置值，以及第二HFN的初始值等于第一HFN的初始值。
方式二：
如果第一SN的初始值减去PDCP SN偏置值小于0，则确定第二SN的初始值等于第一SN的初始值减去PDCP SN偏置值再加上PDCP接收窗口的大小，以及第二HFN的初始值等于第一HFN的初始值减1。
如果第一SN的初始值减去PDCP SN偏置值大于或等于0，则确定第二SN的初始值等于第一SN的初始值减去PDCP SN偏置值，以及第二HFN的初始值等于第一HFN的初始值。
这里，PDCP接收窗口的大小基于PDCP-SN-Size确定，PDCP-SN-Size为PDCP实体支持的SN取值的数量。
终端设备确定出了第二HFN的初始值和第二SN的初始值，也即确定出了第二COUNT值的初始值，也即确定出了RX_DELIV的初始值。
作为示例，参照图6-1，终端设备接收到的第一个数据包的SN的值为1，那么，RX_NEXT对应的第一SN的值为2。在一种方式中，若基站配置PDCP SN偏置值为4，那么，由于第一SN的值 减去PDCP SN偏置值小于0，所以RX_DELIV对应的第二SN的值等于0。
作为示例，参照图6-2，终端设备接收到的第一个数据包的SN的值为1，那么，RX_NEXT对应的第一SN的值为2。在一种方式中，若基站配置PDCP SN偏置值为4，那么，由于第一SN的值减去PDCP SN偏置值小于0，所以RX_DELIV对应的第二SN的值等于第一SN的值减去PDCP SN偏置值再加上PDCP窗口的大小＝2-4+X＝X-2，X为PDCP窗口的大小，即X为PDCP窗口包含的SN数量。
应用实例二
对于UM来说，RLC接收窗口关联的变量包括RX_Next_Highest和RX_Next_Reassembly。
对于AM来说，RLC接收窗口关联的变量包括RX_Next_Highest和RX_Next。
RX_Next_Highest用于指示位于第一数据包的SN后面的SN，所述第一数据包为接收到的数据包中具有最高SN的数据包，称为第三SN；RX_Next_Reassembly/RX_Next用于指示最早一个没有完整接收到的数据包的SN，称为第四SN。
终端设备根据接收到的第一个数据包的SN确定RX_Next_Highest对应的第三SN的初始值。
终端设备确定出了第三SN的初始值，也即确定出了RX_Next_Highest的初始值。
基站通过RRC专用信令为MBS业务配置用于RLC接收的RLC SN偏置值。这里，
对于UM来说，RLC SN偏置值为RX_Next_Highest对应的第三SN和RX_Next_Reassembly对应的第四SN之间的SN差值。
对于AM来说，RLC SN偏置值为RX_Next_Highest对应的第三SN和RX_Next对应的第四SN之间的SN差值。
终端设备通过以下方式确定RX_Next_Reassembly或者RX_Next对应的第四SN的初始值。
方式一：
如果第三SN的初始值减去RLC SN偏置值小于0，则确定第四SN的初始值等于0。
如果第三SN的初始值减去RLC SN偏置值大于或等于0，则确定第四SN的初始值等于第三SN的初始值减去RLC SN偏置值。
方式二：
如果第三SN的初始值减去RLC SN偏置值小于0，则确定第四SN的初始值等于第三SN的初始值减去RLC SN偏置值再加上RLC接收窗口的大小。
如果第三SN的初始值减去RLC SN偏置值大于或等于0，则确定第四SN的初始值等于第三SN的初始值减去RLC SN偏置值。
对于UM来说，RLC接收窗口的大小通过以下方式确定：若SN被配置为6比特，则RLC接收窗口的大小为32；若SN被配置为12比特，则RLC接收窗口的大小为2048。
对于AM来说，RLC接收窗口的大小通过以下方式确定：若SN被配置为12比特，则RLC接收窗口的大小为2048；若SN被配置为18比特，则RLC接收窗口的大小为131072。
终端设备确定出了第四SN的初始值，也即确定出了RX_Next_Reassembly/RX_Next的初始值。
作为示例，参照图7-1，终端设备接收到的第一个数据包的SN的值为1，那么，RX_Next_Highest对应的第三SN的值为2。在一种方式中，若基站配置RLC SN偏置值为4，那么，由于第三SN的值减去RLC SN偏置值小于0，所以RX_Next_Reassembly/RX_Next对应的第四SN的值等于0。
作为示例，参照图7-2，终端设备接收到的第一个数据包的SN的值为1，那么，RX_Next_Highest对应的第三SN的值为2。在一种方式中，若基站配置RLC SN偏置值为4，那么，由于第三SN的值减去RLC SN偏置值小于0，所以RX_Next_Reassembly/RX_Next对应的第四SN的值等于第三SN的值减去RLC SN偏置值再加上RLC窗口的大小＝2-4+Y＝Y-2，Y为RLC窗口的大小，即Y为RLC窗口包含的SN数量。
应用实例三
在一种方式中，基站通过RRC专用信令配置一个定时器(即上述方案中第一定时器)的时长，该定时器用于控制是否根据最新接收到的数据包更新RLC接收窗口，或者是否认为RLC接收窗口的窗外数据为有效数据，进而重新更新RLC接收窗口。
具体地，终端设备接收到定时器后启动该定时器，可选地，如果终端设备的RLC层接收到来自MAC层的RLC PDU，则重启该定时器。如果该定时器超时，则终端设备根据最新接收到的数据包的SN更新RLC接收窗口，或者，终端设备认为RLC窗口的窗外数据为有效数据，根据有效数据的SN更新RLC接收窗口。终端设备更新完RLC接收窗口后，重启定时器。
在另一种方式中，基站通过RRC专用信令配置一个计数器(即上述方案中的第一计数器)的门 限，该计数器用于控制是否根据最新接收到的数据包重新RLC接收窗口，或者是否认为RLC接收窗口的窗外数据为有效数据，进而重新更新RLC接收窗口。
具体地，终端设备每次接收到RLC接收窗口的窗外数据包，就将计数器加1，终端设备连续接收到窗外数据包的个数累计大于基站配置的门限时，终端设备根据最新接收到的数据包的SN更新RLC接收窗口，或者，终端设备认为RLC窗口的窗外数据为有效数据，根据有效数据的SN更新RLC接收窗口。终端设备更新完RLC接收窗口后，重置计数器为0。
作为示例，参照图8，RLC接收窗口在定时器或者计数器的触发下，从位置1更新到了位置2，RLC接收窗口更新的时候，RLC接收窗口的长度不变，RLC接收窗口的最大SN被更新为了最新接收到的数据包的SN。另外，RLC接收窗口的窗外数据是指RLC接收窗口右侧的数据。
以上结合附图详细描述了本申请的优选实施方式，但是，本申请并不限于上述实施方式中的具体细节，在本申请的技术构思范围内，可以对本申请的技术方案进行多种简单变型，这些简单变型均属于本申请的保护范围。例如，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合，为了避免不必要的重复，本申请对各种可能的组合方式不再另行说明。又例如，本申请的各种不同的实施方式之间也可以进行任意组合，只要其不违背本申请的思想，其同样应当视为本申请所公开的内容。又例如，在不冲突的前提下，本申请描述的各个实施例和/或各个实施例中的技术特征可以和现有技术任意的相互组合，组合之后得到的技术方案也应落入本申请的保护范围。
还应理解，在本申请的各种方法实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。此外，在本申请实施例中，术语“下行”、“上行”和“侧行”用于表示信号或数据的传输方向，其中，“下行”用于表示信号或数据的传输方向为从站点发送至小区的用户设备的第一方向，“上行”用于表示信号或数据的传输方向为从小区的用户设备发送至站点的第二方向，“侧行”用于表示信号或数据的传输方向为从用户设备1发送至用户设备2的第三方向。例如，“下行信号”表示该信号的传输方向为第一方向。另外，本申请实施例中，术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系。具体地，A和/或B可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
图9是本申请实施例提供的变量的维护装置的结构组成示意图，应用于终端设备，如图9所示，所述变量的维护装置包括：
接收单元901，用于接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量；
确定单元902，用于确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。
在一些可选实施方式中，所述接收窗口为PDCP接收窗口；
所述第一变量用于指示第一COUNT值，所述第一COUNT值是指期望接收的下一个数据包关联的COUNT值；
所述第二变量用于指示第二COUNT值，所述第二COUNT值是指未递交给上层的第一个数据包关联的COUNT值。
在一些可选实施方式中，所述第一COUNT值包括第一HFN和第一SN；
所述确定单元902，用于基于网络设备发送的第二配置信息确定所述第一HFN的初始值，以及基于所述终端设备接收到的第一个数据包的SN确定所述第一SN的初始值。
在一些可选实施方式中，所述第一SN的初始值为：
(x+1)Mod(2 [PDCP-SN-Size])；
其中，x为所述终端设备接收到的第一个数据包的SN的值，PDCP-SN-Size为PDCP实体支持的SN取值的数量，Mod为取余运算。
在一些可选实施方式中，所述第二COUNT值包括第二HFN和第二SN；
所述确定单元902，用于基于所述第一HFN的初始值确定所述第二HFN的初始值，以及基于所述第一SN的初始值和所述第一偏置值确定所述第二SN的初始值。
在一些可选实施方式中，若所述第一SN的初始值减去所述第一偏置值小于0，则所述确定单元902确定所述第二SN的初始值等于0，以及确定所述第二HFN的初始值等于所述第一HFN的初始值；
若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元902确定所述第二 SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
在一些可选实施方式中，若所述第一SN的初始值减去所述第一偏置值小于0，则所述确定单元902确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值再加上PDCP接收窗口的大小，以及确定所述第二HFN的初始值等于所述第一HFN的初始值减1；
若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元902确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
在一些可选实施方式中，所述接收窗口为RLC接收窗口；
所述第一变量用于指示第三SN，所述第三SN是指位于第一数据包的SN后面的SN，所述第一数据包为接收到的数据包中具有最高SN的数据包；
所述第二变量用于指示第四SN，所述第四SN是指最早一个没有完整接收到的数据包的SN。
在一些可选实施方式中，所述确定单元902，用于基于所述终端设备接收到的第一个数据包的SN确定所述第三SN的初始值。
在一些可选实施方式中，所述第三SN的初始值为所述所述终端设备接收到的第一个数据包的SN的值。
在一些可选实施方式中，所述确定单元902，用于基于所述第三SN的初始值和所述第一偏置值确定所述第四SN的初始值。
在一些可选实施方式中，若所述第三SN的初始值减去所述第一偏置值小于0，则所述确定单元902确定所述第四SN的初始值等于0；
若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元902确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
在一些可选实施方式中，若所述第三SN的初始值减去所述第一偏置值小于0，则所述确定单元902确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值再加上RLC接收窗口的大小；
若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元902确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
在一些可选实施方式中，所述终端设备的RLC实体处于非确认模式或者确认模式。
在一些可选实施方式中，所述终端设备的RLC实体处于确认模式的情况下，
所述接收单元901，还用于接收网络设备发送的第三配置信息，所述第三配置信息用于确定第一定时器的时长或者第一计数器的门限；
所述装置还包括：更新单元903，用于基于所述第一定时器或者所述第一计数器，对所述RLC接收窗口进行更新。
在一些可选实施方式中，所述装置还包括：控制单元，用于在所述接收单元901收到所述第三配置信息后，启动所述第一定时器；
所述更新单元903，用于若所述第一定时器超时，则基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
在一些可选实施方式中，所述控制单元，还用于在所述终端设备的RLC层接收到来自MAC层的数据包后，重启所述第一定时器。
在一些可选实施方式中，所述控制单元，还用于在所述更新单元更新完所述RLC接收窗口后，重启所述第一定时器。
在一些可选实施方式中，所述装置还包括：控制单元，用于在所述接收单元901接收到所述第三配置信息后，启动所述第一计数器；在所述接收单元901每次接收到一个所述RLC接收窗口之外的数据包后，控制所述第一计数器的值加1；
所述更新单元903，用于若所述第一计数器的值大于或等于所述第一计数器的门限，则基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
在一些可选实施方式中，所述控制单元，还用于在所述更新单元更新完所述RLC接收窗口后，重置所述第一计数器。
在一些可选实施方式中，所述接收单元901，还用于基于所述第一变量的值和所述第二变量的 值，接收组播类型的MBS业务。
本领域技术人员应当理解，本申请实施例的上述变量的维护装置的相关描述可以参照本申请实施例的变量的维护方法的相关描述进行理解。
图10是本申请实施例提供的一种通信设备1000示意性结构图。该通信设备可以终端设备，也可以是网络设备。图10所示的通信设备1000包括处理器1010，处理器1010可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
可选地，如图10所示，通信设备1000还可以包括存储器1020。其中，处理器1010可以从存储器1020中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器1020可以是独立于处理器1010的一个单独的器件，也可以集成在处理器1010中。
可选地，如图10所示，通信设备1000还可以包括收发器1030，处理器1010可以控制该收发器1030与其他设备进行通信，具体地，可以向其他设备发送信息或数据，或接收其他设备发送的信息或数据。
其中，收发器1030可以包括发射机和接收机。收发器1030还可以进一步包括天线，天线的数量可以为一个或多个。
可选地，该通信设备1000具体可为本申请实施例的网络设备，并且该通信设备1000可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该通信设备1000具体可为本申请实施例的移动终端/终端设备，并且该通信设备1000可以实现本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
图11是本申请实施例的芯片的示意性结构图。图11所示的芯片1100包括处理器1110，处理器1110可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
可选地，如图11所示，芯片1100还可以包括存储器1120。其中，处理器1110可以从存储器1120中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器1120可以是独立于处理器1110的一个单独的器件，也可以集成在处理器1110中。
可选地，该芯片1100还可以包括输入接口1130。其中，处理器1110可以控制该输入接口1130与其他设备或芯片进行通信，具体地，可以获取其他设备或芯片发送的信息或数据。
可选地，该芯片1100还可以包括输出接口1140。其中，处理器1110可以控制该输出接口1140与其他设备或芯片进行通信，具体地，可以向其他设备或芯片输出信息或数据。
可选地，该芯片可应用于本申请实施例中的网络设备，并且该芯片可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该芯片可应用于本申请实施例中的移动终端/终端设备，并且该芯片可以实现本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片，系统芯片，芯片系统或片上系统芯片等。
图12是本申请实施例提供的一种通信系统1200的示意性框图。如图12所示，该通信系统1200包括终端设备1210和网络设备1220。
其中，该终端设备1210可以用于实现上述方法中由终端设备实现的相应的功能，以及该网络设备1220可以用于实现上述方法中由网络设备实现的相应的功能为了简洁，在此不再赘述。
应理解，本申请实施例的处理器可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM， EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，上述存储器为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例还提供了一种计算机可读存储介质，用于存储计算机程序。
可选的，该计算机可读存储介质可应用于本申请实施例中的网络设备，并且该计算机程序使得计算机执行本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机可读存储介质可应用于本申请实施例中的移动终端/终端设备，并且该计算机程序使得计算机执行本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机程序产品，包括计算机程序指令。
可选的，该计算机程序产品可应用于本申请实施例中的网络设备，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机程序产品可应用于本申请实施例中的移动终端/终端设备，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机程序。
可选的，该计算机程序可应用于本申请实施例中的网络设备，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机程序可应用于本申请实施例中的移动终端/终端设备，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，)ROM、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (47)

  1. 一种变量的维护方法，所述方法包括：
    终端设备接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量；
    所述终端设备确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。
  2. 根据权利要求1所述的方法，其中，所述接收窗口为分组数据汇聚协议PDCP接收窗口；
    所述第一变量用于指示第一计数COUNT值，所述第一COUNT值是指期望接收的下一个数据包关联的COUNT值；
    所述第二变量用于指示第二COUNT值，所述第二COUNT值是指未递交给上层的第一个数据包关联的COUNT值。
  3. 根据权利要求2所述的方法，其中，所述第一COUNT值包括第一超帧号HFN和第一序列号SN；
    所述终端设备确定所述第一变量的值，包括：
    所述终端设备基于网络设备发送的第二配置信息确定所述第一HFN的初始值，以及基于所述终端设备接收到的第一个数据包的SN确定所述第一SN的初始值。
  4. 根据权利要求3所述的方法，其中，所述第一SN的初始值为：
    (x+1)Mod(2 [PDCP-SN-Size])；
    其中，x为所述终端设备接收到的第一个数据包的SN的值，PDCP-SN-Size为PDCP实体支持的SN取值的数量，Mod为取余运算。
  5. 根据权利要求3或4所述的方法，其中，所述第二COUNT值包括第二HFN和第二SN；
    所述基于所述第一变量的值和所述第一偏置值确定所述第二变量的值，包括：
    所述终端设备基于所述第一HFN的初始值确定所述第二HFN的初始值，以及基于所述第一SN的初始值和所述第一偏置值确定所述第二SN的初始值。
  6. 根据权利要求5所述的方法，其中，所述终端设备基于所述第一HFN的初始值确定所述第二HFN的初始值，以及基于所述第一SN的初始值和所述第一偏置值确定所述第二SN的初始值，包括：
    若所述第一SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第二SN的初始值等于0，以及确定所述第二HFN的初始值等于所述第一HFN的初始值；
    若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
  7. 根据权利要求5所述的方法，其中，所述终端设备基于所述第一HFN的初始值确定所述第二HFN的初始值，以及基于所述第一SN的初始值和所述第一偏置值确定所述第二SN的初始值，包括：
    若所述第一SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值再加上PDCP接收窗口的大小，以及确定所述第二HFN的初始值等于所述第一HFN的初始值减1；
    若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
  8. 根据权利要求1所述的方法，其中，所述接收窗口为无线链路层控制RLC接收窗口；
    所述第一变量用于指示第三SN，所述第三SN是指位于第一数据包的SN后面的SN，所述第一数据包为接收到的数据包中具有最高SN的数据包；
    所述第二变量用于指示第四SN，所述第四SN是指最早一个没有完整接收到的数据包的SN。
  9. 根据权利要求8所述的方法，其中，所述终端设备确定所述第一变量的值，包括：
    所述终端设备基于所述终端设备接收到的第一个数据包的SN确定所述第三SN的初始值。
  10. 根据权利要求9所述的方法，其中，所述第三SN的初始值为所述所述终端设备接收到 的第一个数据包的SN的值。
  11. 根据权利要求8至10中任一项所述的方法，其中，所述基于所述第一变量的值和所述第一偏置值确定所述第二变量的值，包括：
    所述终端设备基于所述第三SN的初始值和所述第一偏置值确定所述第四SN的初始值。
  12. 根据权利要求11所述的方法，其中，所述终端设备基于所述第三SN的初始值和所述第一偏置值确定所述第四SN的初始值，包括：
    若所述第三SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第四SN的初始值等于0；
    若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
  13. 根据权利要求11所述的方法，其中，所述终端设备基于所述第三SN的初始值和所述第一偏置值确定所述第四SN的初始值，包括：
    若所述第三SN的初始值减去所述第一偏置值小于0，则所述终端设备确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值再加上RLC接收窗口的大小；
    若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述终端设备确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
  14. 根据权利要求8至13中任一项所述的方法，其中，所述终端设备的RLC实体处于非确认模式UM或者确认模式AM。
  15. 根据权利要求14所述的方法，其中，所述终端设备的RLC实体处于确认模式的情况下，所述方法还包括：
    所述终端设备接收网络设备发送的第三配置信息，所述第三配置信息用于确定第一定时器的时长或者第一计数器的门限；
    所述终端设备基于所述第一定时器或者所述第一计数器，对所述RLC接收窗口进行更新。
  16. 根据权利要求15所述的方法，其中，所述终端设备基于所述第一定时器，对所述RLC接收窗口进行更新，包括：
    所述终端设备接收到所述第三配置信息后，启动所述第一定时器；
    若所述第一定时器超时，则所述终端设备基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，所述终端设备确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
  17. 根据权利要求16所述的方法，其中，所述方法还包括：
    所述终端设备的RLC层接收到来自媒体接入控制MAC层的数据包后，重启所述第一定时器。
  18. 根据权利要求16或17所述的方法，其中，所述方法还包括：
    所述终端设备更新完所述RLC接收窗口后，重启所述第一定时器。
  19. 根据权利要求15所述的方法，其中，所述终端设备基于所述第一计数器，对所述RLC接收窗口进行更新，包括：
    所述终端设备接收到所述第三配置信息后，启动所述第一计数器；
    所述终端设备每次接收到一个所述RLC接收窗口之外的数据包后，控制所述第一计数器的值加1；
    若所述第一计数器的值大于或等于所述第一计数器的门限，则所述终端设备基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，所述终端设备确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
  20. 根据权利要求19所述的方法，其中，所述方法还包括：
    所述终端设备更新完所述RLC接收窗口后，重置所述第一计数器。
  21. 根据权利要求1至20中任一项所述的方法，其中，所述方法还包括：
    所述终端设备基于所述第一变量的值和所述第二变量的值，接收组播类型的多播广播服务MBS业务。
  22. 一种变量的维护装置，应用于终端设备，所述装置包括：
    接收单元，用于接收网络设备发送的第一配置信息，所述第一配置信息用于确定第一变量和第二变量之间的第一偏置值；其中，所述第一变量和所述第二变量为接收窗口相关的变量；
    确定单元，用于确定所述第一变量的值，基于所述第一变量的值和所述第一偏置值确定所述第二变量的值。
  23. 根据权利要求22所述的装置，其中，所述接收窗口为PDCP接收窗口；
    所述第一变量用于指示第一COUNT值，所述第一COUNT值是指期望接收的下一个数据包关联的COUNT值；
    所述第二变量用于指示第二COUNT值，所述第二COUNT值是指未递交给上层的第一个数据包关联的COUNT值。
  24. 根据权利要求23所述的装置，其中，所述第一COUNT值包括第一HFN和第一SN；
    所述确定单元，用于基于网络设备发送的第二配置信息确定所述第一HFN的初始值，以及基于所述终端设备接收到的第一个数据包的SN确定所述第一SN的初始值。
  25. 根据权利要求24所述的装置，其中，所述第一SN的初始值为：
    (x+1)Mod(2 [PDCP-SN-Size])；
    其中，x为所述终端设备接收到的第一个数据包的SN的值，PDCP-SN-Size为PDCP实体支持的SN取值的数量，Mod为取余运算。
  26. 根据权利要求24或25所述的装置，其中，所述第二COUNT值包括第二HFN和第二SN；
    所述确定单元，用于基于所述第一HFN的初始值确定所述第二HFN的初始值，以及基于所述第一SN的初始值和所述第一偏置值确定所述第二SN的初始值。
  27. 根据权利要求26所述的装置，其中，
    若所述第一SN的初始值减去所述第一偏置值小于0，则所述确定单元确定所述第二SN的初始值等于0，以及确定所述第二HFN的初始值等于所述第一HFN的初始值；
    若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
  28. 根据权利要求26所述的装置，其中，
    若所述第一SN的初始值减去所述第一偏置值小于0，则所述确定单元确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值再加上PDCP接收窗口的大小，以及确定所述第二HFN的初始值等于所述第一HFN的初始值减1；
    若所述第一SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元确定所述第二SN的初始值等于第一SN的初始值减去所述第一偏置值，以及确定所述第二HFN的初始值等于所述第一HFN的初始值。
  29. 根据权利要求22所述的装置，其中，所述接收窗口为RLC接收窗口；
    所述第一变量用于指示第三SN，所述第三SN是指位于第一数据包的SN后面的SN，所述第一数据包为接收到的数据包中具有最高SN的数据包；
    所述第二变量用于指示第四SN，所述第四SN是指最早一个没有完整接收到的数据包的SN。
  30. 根据权利要求29所述的装置，其中，所述确定单元，用于基于所述终端设备接收到的第一个数据包的SN确定所述第三SN的初始值。
  31. 根据权利要求30所述的装置，其中，所述第三SN的初始值为所述所述终端设备接收到的第一个数据包的SN的值。
  32. 根据权利要求29至31中任一项所述的装置，其中，所述确定单元，用于基于所述第三SN的初始值和所述第一偏置值确定所述第四SN的初始值。
  33. 根据权利要求32所述的装置，其中，
    若所述第三SN的初始值减去所述第一偏置值小于0，则所述确定单元确定所述第四SN的初始值等于0；
    若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
  34. 根据权利要求32所述的装置，其中，
    若所述第三SN的初始值减去所述第一偏置值小于0，则所述确定单元确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值再加上RLC接收窗口的大小；
    若所述第三SN的初始值减去所述第一偏置值大于或等于0，则所述确定单元确定所述第四SN的初始值等于所述第三SN的初始值减去所述第一偏置值。
  35. 根据权利要求30至34中任一项所述的装置，其中，所述终端设备的RLC实体处于非确认模式或者确认模式。
  36. 根据权利要求35所述的装置，其中，所述终端设备的RLC实体处于确认模式的情况下，
    所述接收单元，还用于接收网络设备发送的第三配置信息，所述第三配置信息用于确定第一定时器的时长或者第一计数器的门限；
    所述装置还包括：更新单元，用于基于所述第一定时器或者所述第一计数器，对所述RLC接收窗口进行更新。
  37. 根据权利要求36所述的装置，其中，
    所述装置还包括：控制单元，用于在所述接收单元收到所述第三配置信息后，启动所述第一定时器；
    所述更新单元，用于若所述第一定时器超时，则基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
  38. 根据权利要求37所述的装置，其中，所述控制单元，还用于在所述终端设备的RLC层接收到来自MAC层的数据包后，重启所述第一定时器。
  39. 根据权利要求37或38所述的装置，其中，所述控制单元，还用于在所述更新单元更新完所述RLC接收窗口后，重启所述第一定时器。
  40. 根据权利要求36所述的装置，其中，
    所述装置还包括：控制单元，用于在所述接收单元接收到所述第三配置信息后，启动所述第一计数器；在所述接收单元每次接收到一个所述RLC接收窗口之外的数据包后，控制所述第一计数器的值加1；
    所述更新单元，用于若所述第一计数器的值大于或等于所述第一计数器的门限，则基于最新接收到的数据包的SN对所述RLC接收窗口进行更新，或者，确定所述RLC接收窗口之外的数据包为有效数据包基于所述有效数据包的SN对所述RLC接收窗口进行更新。
  41. 根据权利要求40所述的装置，其中，所述控制单元，还用于在所述更新单元更新完所述RLC接收窗口后，重置所述第一计数器。
  42. 根据权利要求22至41中任一项所述的装置，其中，所述接收单元，还用于基于所述第一变量的值和所述第二变量的值，接收组播类型的MBS业务。
  43. 一种终端设备，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，执行如权利要求1至21中任一项所述的方法。
  44. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求1至21中任一项所述的方法。
  45. 一种计算机可读存储介质，用于存储计算机程序，所述计算机程序使得计算机执行如权利要求1至21中任一项所述的方法。
  46. 一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求1至21中任一项所述的方法。
  47. 一种计算机程序，所述计算机程序使得计算机执行如权利要求1至21中任一项所述的方法。
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