WO2020172844A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2020172844A1
WO2020172844A1 PCT/CN2019/076446 CN2019076446W WO2020172844A1 WO 2020172844 A1 WO2020172844 A1 WO 2020172844A1 CN 2019076446 W CN2019076446 W CN 2019076446W WO 2020172844 A1 WO2020172844 A1 WO 2020172844A1
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WO
WIPO (PCT)
Prior art keywords
resource
terminal device
message
downlink data
identifier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/076446
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English (en)
Chinese (zh)
Inventor
王宏
单宝堃
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2019/076446 priority Critical patent/WO2020172844A1/fr
Priority to CN201980077306.8A priority patent/CN113170415B/zh
Publication of WO2020172844A1 publication Critical patent/WO2020172844A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to communication methods, and in particular to communication methods and devices.
  • MTC machine type communication
  • NB-IoT narrowband internet of things
  • the industry proposes a method for early transmission of downlink data.
  • the main idea is to send downlink data to the terminal device in the general connection establishment process or in the random access process or not through the connection establishment process. For example, after the access network device sends a paging message, the downlink data can be sent to the terminal device.
  • the foregoing method for early transmission of downlink data may cause additional power consumption for the terminal in the network, and may increase additional resource overhead for the air interface.
  • the present application provides a communication method and device, which on the one hand is beneficial to reduce the power consumption of the terminal, and on the other hand, is beneficial to save the resource cost of the air interface.
  • a communication method including: a terminal device determines a first identifier, where the first identifier is used by the terminal device to monitor downlink data in an idle state or in an inactive state; A first identifier, receiving a first message from an access network device, the first message including the downlink data and resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used for the The terminal device sends the feedback information of the downlink data.
  • the present application by carrying the information indicating the feedback resource in the first message including the downlink data sent to the terminal, it is possible to avoid carrying the information indicating the feedback resource through the paging message. In this way, the size of the paging message can be reduced, thereby reducing the power consumption of the unpaged terminal receiving the paging message. In addition, for the network, the resource overhead of sending paging messages in multiple cells can be reduced.
  • the method further includes: in a case where the downlink data is not monitored within a preset first time period, the terminal device stops using the first identifier to monitor the downlink Data; or, in the case that the downlink data is not monitored within the preset second time period, the terminal device initiates a random access process.
  • the terminal device can preset the time period for listening to the downlink data. If the downlink data is not monitored within the preset time period, it no longer monitors the downlink data or initiates a random access process, thereby improving The efficiency of the terminal equipment to monitor data improves the timeliness and reliability of data acquisition.
  • the resource configuration information further includes first information, and the first information is used to indicate the effective time of using the first resource.
  • the resource configuration information further includes a valid time for indicating the first resource, so that the terminal device sends feedback information according to the valid time, which improves the efficiency of sending feedback information by the terminal device.
  • the first resource is a periodic resource
  • the first information is used to indicate the number of times the first resource is used.
  • the first resource includes a second resource and a third resource
  • the second resource is used to feed back positive acknowledgement ACK information
  • the third resource is used to feed back negative Reply to NACK message.
  • different resources may be used to feed back ACK information and NACK information, thereby improving the communication efficiency of the terminal device in feeding back downlink data.
  • the first resource includes a physical uplink control channel PUCCH resource or a physical random access channel PRACH resource.
  • the first message further includes the downlink data.
  • the first message also carries the next hop link count NCC and/or the recovery identifier.
  • the first message is a radio resource control RRC message dedicated to the terminal device.
  • the first message includes an RRC message and a random access response RAR message
  • the RRC message includes the downlink data
  • the RAR message includes the resource configuration information
  • the first message is an RRC connection release message or an early RRC data transmission complete message.
  • the method further includes: the terminal device receives a paging message from the access network device, and the paging message includes the first identifier.
  • the first identifier is carried in an RRC connection release message or an RRC early data transmission complete message.
  • the terminal device deletes the saved first identifier.
  • the terminal device can delete the saved first identifier and no longer use the first identifier to monitor the downlink channel , To reduce the power consumption of terminal equipment.
  • a communication method including: a terminal device determines a first identifier, where the first identifier is used by the terminal device to monitor downlink data in an idle state or in an inactive state; A first identifier, receiving control information from an access network device, the control information is used to schedule the downlink data, the control information includes resource configuration information, and the resource configuration information is used to indicate a first resource.
  • the resource is used by the terminal device to send feedback information of the downlink data.
  • the present application by carrying the information indicating the feedback resource in the control information sent to the terminal, it is possible to avoid carrying the information indicating the feedback resource through the paging message. In this way, the size of the paging message can be reduced, thereby reducing the power consumption of the unpaged terminal receiving the paging message. In addition, for the network, the resource overhead of sending paging messages in multiple cells can be reduced.
  • the method further includes: in a case where the downlink data is not monitored within a preset first time period, the terminal device stops using the first identifier to monitor the downlink Data; or, in the case that the downlink data is not monitored within the preset second time period, the terminal device initiates a random access process.
  • the resource configuration information further includes first information, and the first information is used to indicate the effective time of using the first resource.
  • the first resource is a periodic resource
  • the first information is used to indicate the number of times the first resource is used.
  • the first resource includes a second resource and a third resource
  • the second resource is used to feed back positive acknowledgement ACK information
  • the third resource is used to feed back negative Reply to NACK message.
  • the first resource includes a physical uplink control channel PUCCH resource or a physical random access channel PRACH resource.
  • the first message further includes the downlink data.
  • the first message also carries the next hop link count NCC and/or the recovery identifier.
  • control information is carried in a random access response RAR message.
  • control information is downlink control information DCI.
  • the method further includes: the terminal device receives a paging message from the access network device, and the paging message includes the first identifier.
  • the first identifier is carried in an RRC connection release message or an RRC early data transmission complete message.
  • the terminal device when a cell reselection occurs in a terminal device, the terminal device deletes the stored first identifier.
  • a communication method including: an access network device sends a first identifier to a terminal device, where the first identifier is used by the terminal device to monitor downlink data in an idle state or an inactive state; and access;
  • the network device sends a first message to the terminal device, the first message includes the downlink data and resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used by the terminal device to send all the information.
  • the feedback information of the downlink data including: an access network device sends a first identifier to a terminal device, where the first identifier is used by the terminal device to monitor downlink data in an idle state or an inactive state; and access;
  • the network device sends a first message to the terminal device, the first message includes the downlink data and resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used by the terminal device to send all the information.
  • the feedback information of the downlink data including: an access network device sends a first identifier
  • the present application by carrying the information indicating the feedback resource in the first message including the downlink data sent to the terminal, it is possible to avoid carrying the information indicating the feedback resource through the paging message. In this way, the size of the paging message can be reduced, thereby reducing the power consumption of the unpaged terminal receiving the paging message. In addition, for the network, the resource overhead of sending paging messages in multiple cells can be reduced.
  • the resource configuration information further includes first information, and the first information is used to indicate the effective time of using the first resource.
  • the first resource is a periodic resource
  • the first information is used to indicate the number of times the first resource is used.
  • the first resource includes a second resource and a third resource
  • the second resource is used to feed back positive acknowledgement ACK information
  • the third resource is used to feed back negative Reply to NACK message.
  • the first resource includes a physical uplink control channel PUCCH resource or a physical random access channel PRACH resource.
  • the first message further includes the downlink data.
  • the first message also carries the next hop link count NCC and/or the recovery identifier.
  • the first message is a radio resource control RRC message dedicated to the terminal device.
  • the first message includes an RRC message and a random access response RAR message
  • the RRC message includes the downlink data
  • the RAR message includes the resource configuration information
  • the first message is an RRC connection release message or an early RRC data transmission complete message.
  • that the access network device sends the first identifier to the terminal device includes: the access network device sends a paging message to the terminal device, and the paging The message includes the first identifier.
  • a communication method including: an access network device sends a first identifier to a terminal device, where the first identifier is used by the terminal device to monitor downlink data in an idle state or an inactive state; and access;
  • the network device sends control information to the terminal device, the control information is used to schedule the downlink data, the control information includes resource configuration information, and the resource configuration information is used to indicate a first resource, and the first resource is used for all
  • the terminal device sends feedback information of the downlink data.
  • the present application by carrying the information indicating the feedback resource in the control information sent to the terminal, it is possible to avoid carrying the information indicating the feedback resource through the paging message. In this way, the size of the paging message can be reduced, thereby reducing the power consumption of the unpaged terminal receiving the paging message. In addition, for the network, the resource overhead of sending paging messages in multiple cells can be reduced.
  • the resource configuration information further includes first information, and the first information is used to indicate the effective time of using the first resource.
  • the first resource is a periodic resource
  • the first information is used to indicate the number of times the first resource is used.
  • the first resource includes a second resource and a third resource
  • the second resource is used to feed back positive acknowledgement ACK information
  • the third resource is used to feed back negative Reply to NACK message.
  • the first resource includes a physical uplink control channel PUCCH resource or a physical random access channel PRACH resource.
  • control information is carried in a random access response RAR message.
  • control information is downlink control information DCI.
  • the sending of the first identifier by the access network device to the terminal device includes: the access network device sends a paging message to the terminal device, and the paging The message includes the first identifier.
  • a device configured to execute the foregoing aspects or methods in any possible implementation manners of the aspects.
  • the device includes a unit for executing the foregoing aspects or methods in any possible implementation manners of the aspects.
  • the device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the above aspects.
  • the modules may be hardware circuits, software, or hardware circuits combined with software. .
  • an apparatus which includes: a communication interface, a memory, and a processor.
  • the communication interface, the memory, and the processor communicate with each other through an internal connection path, the memory is used to store instructions, and the processor is used to execute the instructions stored in the memory to implement the foregoing aspects or any possible implementation manners of each aspect Method in.
  • a system in a seventh aspect, includes a device for implementing the first aspect or any possible method of the first aspect, and a device for implementing any of the second or second aspects.
  • a computer program product comprising: computer program code, when the computer program code is run by a computing device, the computing device causes the computing device to execute the above aspects or any of the aspects One of the possible implementation methods.
  • a computer-readable medium for storing instructions that, when the instructions run on a computer, cause the computer to execute the instructions of the above-mentioned aspects or the methods in any of the possible implementations of the aspects .
  • an embodiment of the present application provides a chip system.
  • the chip system includes a processor and may also include a memory for implementing the functions of the terminal device or the access network device in the foregoing method.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • an embodiment of the present application provides a communication system.
  • the communication system includes a terminal device and an access network device.
  • the terminal device is used to implement the above-mentioned first aspect or any possible implementation of the first aspect.
  • the second aspect or any one of the possible implementation methods of the second aspect the aforementioned access network device is used to implement the aforementioned third aspect or any one of the possible implementation methods of the third aspect, or the aforementioned fourth or first aspect Any one of the four possible methods.
  • FIG. 1 is a schematic block diagram of a wireless communication system architecture according to an embodiment of the present application.
  • Fig. 2 is a schematic diagram of a 5G network architecture according to an embodiment of the present application.
  • Fig. 3 is a schematic diagram of a 4G network architecture according to an embodiment of the present application.
  • Fig. 4 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 5-1 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • Fig. 5-2 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of an access network device according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of an access network device according to another embodiment of the present application.
  • LTE long term evolution
  • FDD frequency division duplex
  • time division duplex time division duplex
  • TDD long term evolution
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • new radio new radio
  • the terminal equipment in the embodiments of the application may refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless Communication equipment, user agent or user device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), with wireless communication Functional handheld devices, satellite wireless devices, TV set top boxes (STB), customer premise equipment (CPE), computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, the future
  • the terminal equipment in the 5G network or the terminal equipment in the public land mobile network (PLMN) that will evolve in the future is not limited in the embodiment of the present application.
  • the access network device in the embodiment of the present application may be a device used to communicate with a terminal device.
  • Access network equipment is the bridge between terminal equipment and the core network.
  • the access network devices can be connected through a communication interface (for example, it can be called an X2 interface).
  • the main functions of the access network equipment can include but are not limited to at least one of the following: radio resource management, IP header compression and user data stream encryption, mobility management entity (MME) selection when terminal equipment is attached, and routing users It covers the serving gateway (SGW), the organization and sending of paging messages, the organization and sending of broadcast messages, the measurement and measurement report configuration for the purpose of mobility, etc.
  • MME mobility management entity
  • the access network equipment can be a global system for mobile communications (GSM) system or a base transceiver station (BTS) in code division multiple access (CDMA), or a broadband code division
  • GSM global system for mobile communications
  • BTS base transceiver station
  • CDMA code division multiple access
  • NB base station
  • WCDMA code division multiple access
  • eNB evolved NodeB
  • eNodeB cloud wireless access network
  • the radio access network (CRAN) scenario of the wireless controller, or the access network equipment can be relay stations, access points, in-vehicle equipment, wearable devices, and access network equipment in the 5G network or in the future evolved PLMN network Access network equipment, etc., are not limited in the embodiment of the present application.
  • the core network equipment may include, for example, a user plane function (UPF) entity, an access and mobility management function (AMF), and a session management function (session management function). ,SMF).
  • the core network equipment may also be a mobility management entity (mobility management entity, MME).
  • the terminal device, the access network device, or the core network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as central processing unit (CPU), memory management unit (MMU), and memory (also called main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the application do not specifically limit the specific structure of the execution subject of the methods provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be provided according to the embodiments of the application.
  • the execution subject of the method provided in this embodiment of the application may be a terminal device, an access network device, or a core network device, or a terminal device, an access network device, or a core network device that can be called Program and execute the functional modules of the program.
  • computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (digital versatile disc, DVD)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.).
  • magnetic storage devices for example, hard disks, floppy disks, or tapes, etc.
  • optical disks for example, compact discs (CD), digital versatile discs (digital versatile disc, DVD)
  • smart cards and flash memory devices for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.
  • various storage media described herein may represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.
  • FIG. 1 is a schematic block diagram of a wireless communication system architecture 100 applicable to an embodiment of the present application.
  • the system architecture 100 includes a terminal device 110, an access network device 120, a core network device 130, and a data network 160 (DN).
  • the core network device 130 includes a management device 140 and a gateway.
  • Equipment 150 the terminal device 110 in FIG. 1 can be used to connect to the access network device 120 deployed by the operator through a wireless air interface, and then to the data network through the core network device 130;
  • the access network device 120 is mainly used to implement the wireless physical layer Functions, resource scheduling and wireless resource management, wireless access control, and mobility management;
  • the core network device 130 may include a management device 140 and a gateway device 150.
  • the management device 140 is mainly used for device registration, security authentication, and mobility of terminal devices.
  • the gateway device 150 is mainly used to establish a channel between the terminal device and the terminal device, and forward data packets between the terminal device and an external data network on the channel; the data network 160 can correspond to a variety of different business domains, For example, Internet Protocol Multimedia Subsystem (IMS), Internet (Internet), Internet Protocol Television (IPTV), other operator business domains, etc., which are mainly used to provide multiple data service services for terminal devices , Which can include network devices such as servers (including servers that provide multicast services), routers, and gateways.
  • FIG. 1 is only an exemplary architecture diagram. In addition to the functional units shown in FIG. 1, the network architecture may also include other functional units or functional entities, which are not limited in the embodiment of the present application.
  • the aforementioned access network equipment may be an access network (AN)/radio access network (RAN) equipment, consisting of multiple 5G-AN/5G -A network composed of RAN nodes
  • the 5G-AN/5G-RAN nodes can be: access point (access point, AP), next-generation base station (NR nodeB, gNB), central unit (central unit, CU) and distributed A unit (distributed unit, DU) separated form of a gNB, a transmission receive point (TRP), a transmission point (TP), or some other access node.
  • the aforementioned core network equipment may include: access and mobility management function (AMF), session management function (session management function, SMF), policy control function (PCF), user plane funtion , UPF) and other functional units, these functional units can work independently, can also be combined to achieve certain control functions, such as: AMF, SMF and PCF can be combined together as a management device to complete the access authentication of terminal equipment , Security encryption, location registration and other access control and mobility management functions, as well as session management functions such as the establishment, release and modification of user plane transmission paths, as well as analysis of some slice-related data (such as congestion) and terminal equipment related functions
  • AMF access and mobility management function
  • SMF session management function
  • PCF policy control function
  • the access network equipment may be a base station (nodeB, NB), evolved nodeB (eNB), HeNB, TRP, TP, AP, or some other access unit;
  • Core network equipment may include: mobility management entity (MME), policy and charging rules function (policy and charging rules function, PCRF) and other management equipment, as well as serving gateway (SGW), packet data network gateway (packet data network gateway, PGW), local gateway (local gateway, LGW) and other gateway devices.
  • MME mobility management entity
  • policy and charging rules function policy and charging rules function
  • PCRF serving gateway
  • PGW packet data network gateway
  • LGW local gateway
  • FIG. 2 is a schematic diagram of another example of a network architecture applicable to this application.
  • each functional unit can establish a connection through a next generation network (NG) interface to achieve communication, such as :
  • the terminal equipment establishes an air interface connection with the access network equipment through the new radio (NR) interface to transmit user plane data and control plane signaling;
  • the terminal equipment can establish a control plane with AMF through NG interface 1 (abbreviated as N1) Signaling connection;
  • access network equipment such as the next generation radio access base station (NR NodeB, gNB), can establish a user plane data connection with UPF through NG interface 3 (abbreviated as N3);
  • access network equipment can use NG interface 2 ( N2 for short) establish a control plane signaling connection with AMF;
  • UPF can establish a control plane signaling connection with SMF through NG interface 4 (N4 for short);
  • UPF can exchange user plane data with the data network through NG interface 6 (N6 for short);
  • AMF The control plane signaling
  • the network architecture may also include other functional units or functional entities.
  • the core network equipment may also include unified Other functional units such as a data management function (unified data management, UDM) are not limited in the embodiment of the present application.
  • UDM unified data management
  • FIG. 3 shows a schematic diagram of another 4G network architecture applicable to the present application.
  • the terminal equipment can establish an air interface connection with the access network equipment through the Uu interface
  • the access network equipment establishes a control plane signaling connection with the MME through the S1-C interface
  • the access network equipment through S1 -U interface establishes user plane data connection with SGW
  • SGW establishes control plane signaling connection with MME through S11
  • SGW establishes user plane data connection with PGW through S5/S8 interface
  • PGW and PCRF are connected through Gx interface.
  • the PGW and the data network are also connected through a communication interface.
  • the air interface shown in FIG. 3 may also be referred to as 3GPP air interface.
  • FIGS. 1 to 3 are only exemplary architecture diagrams, and the embodiment of the present application does not limit the names of the function modules and communication structures therein.
  • the network architecture may also include other functional units or functional entities, or include fewer functional units or functional entities, which is not limited in the embodiment of the present application.
  • Idle state In the idle state, no dedicated data or signaling bearer is established between the terminal equipment and the access network equipment, and no dedicated bearer is established between the terminal equipment and the core network equipment.
  • Connected state In the connected state, a dedicated data and signaling bearer is established between the terminal equipment and the access network equipment.
  • Inactive state In the inactive state, no dedicated data or signaling bearer is established between the terminal device and the access network device, and a dedicated bearer is established between the terminal device and the core network device.
  • Msg1 can refer to a random access preamble (preamble)
  • message 2 (message 2, Msg 2) can refer to a random access response (random access response, RAR) message
  • Msg3 can refer to conflict resolution of associated UEs during random access.
  • CCCH common control channel
  • SDU service data unit
  • RRC connection request radio resource control connection request
  • RRC connection Reestablishment request RRC connection reestablishment request
  • RRC early data request RRC early data request
  • RRC connection resume request RRC connection resume request
  • Message 4 (message 4, Msg 4) can refer to RRC connection setup (RRC connection setup) message, RRC connection resume (RRC connection resume) message, RRC connection release (RRC connection release) message, RRC connection reestablishment (RRC connection reestablishment) message Or RRC early data complete (RRC early data complete) message.
  • Msg 5 may refer to an RRC connection setup complete (RRC connection setup complete) message or an RRC connection reestablishment complete (RRC connection reestablishment complete) message.
  • Figure 4 shows the process of the terminal device entering the connected state from the idle state.
  • the communication architecture of FIG. 3 is taken as an example for description. Those skilled in the art can understand that this method can also be used in other similar communication architectures.
  • steps S1 to S3 are a paging process triggered by downlink data
  • steps S4 to S8 are a process of random access (random access) performed by a terminal device.
  • S1 SGW sends downlink data indication information to MME.
  • the SGW when the SGW on the core network side has the arrival of downlink data from a terminal device, the SGW sends a downlink data indication message to the MME to notify the MME that the downlink data of a certain terminal device has arrived.
  • the downlink data indication message can carry the evolution packet of the terminal device.
  • the system bearer identifier (evolved packet system bearer identifier, EPS bearer ID).
  • the MME sends a paging message to the access network device.
  • the MME After the MME receives the downlink data indication message sent by the SGW, the MME sends a paging message to the access network device, so that the access network device pages the terminal device.
  • the paging message in step S2 may be called Slpaging.
  • the access network device sends a paging message to the terminal device.
  • the access network device After receiving the paging message sent by the MME, the access network device sends the paging message in a broadcast form.
  • the terminal device in the idle state will periodically monitor the paging message sent by the access network device.
  • the terminal device monitors the paging message sent by the access network device and the paging message carries the identification of the terminal device, the terminal device will Trigger the RRC connection establishment process.
  • the paging message in step S3 may be called Uu paging.
  • the terminal device sends a random access preamble to the access network device, where the preamble sent in S4 is Msg1.
  • the random access preamble may be broadcast by the access network device to the terminal device through a broadcast message.
  • the terminal device that needs to initiate the random access process selects a preamble randomly from the several preambles broadcast by the access network device, and Among the resources for sending the preamble broadcast by the access network device, a resource is randomly selected to send the preamble selected by the terminal device to the access network device.
  • the access network device sends a random access response (random access response, RAR) message to the terminal device.
  • RAR random access response
  • the RAR message is Msg 2.
  • the access network device can monitor the preamble sent by the terminal device on the preamble resource. When a certain preamble is detected, the access network device confirms that a terminal device has sent the preamble, and sends a RAR message to the terminal device.
  • the RAR message may include timing advanced (TA) for the terminal device to send Msg3, and uplink resource grant (uplink grant resource) for the terminal device to send Msg3.
  • TA timing advanced
  • uplink resource grant uplink grant resource
  • the terminal device After receiving the RAR sent by the access network device, the terminal device sends an RRC connection request message to the access network device, that is, sends Msg3 to the access network device.
  • the terminal device may send an RRC connection request message (RRC connection request) according to the TA and uplink resource grant in the RAR message.
  • RRC connection request RRC connection request
  • the RRC connection request message carries an identifier (ID) of the terminal device, and the ID of the terminal device may be the system architecture evolution temporary mobile device identifier (S-TMSI) of the terminal device. ) Or International Mobile Subscriber Identification Number (IMSI).
  • ID identifier
  • S-TMSI system architecture evolution temporary mobile device identifier
  • IMSI International Mobile Subscriber Identification Number
  • the access network device sends an RRC connection setup (RRC connection setup) message to the terminal device.
  • RRC connection setup RRC connection setup
  • the terminal device sends an RRC connection setup complete (RRC connection setup complete) message to the access network device.
  • RRC connection setup complete RRC connection setup complete
  • the access network device sends an initial UE message (initial UE message) to the MME.
  • the MME sends an initial context setup request (initial context setup request) to the access network device.
  • the context may be referred to as the UE context, which may include information such as the basic configuration of the terminal device and the communication capability of the terminal device.
  • the access network device sends a security mode command (security mode command) to the terminal device.
  • the terminal device sends a security mode complete (security mode complete) message to the access network device.
  • S11-S12 are the process of setting the security context of the terminal device.
  • the access network device sends an RRC connection reconfiguration (RRC connection reconfiguration) message to the terminal device.
  • RRC connection reconfiguration RRC connection reconfiguration
  • this step can be used to configure a data radio bearer (DRB) and a signaling radio bearer 2 (signaling radio bearer 2, SRB2).
  • DRB data radio bearer
  • SRB2 signaling radio bearer 2
  • the terminal device sends an RRC connection reconfiguration complete (RRC connection reconfiguration complete) message to the access network device.
  • RRC connection reconfiguration complete RRC connection reconfiguration complete
  • the access network device sends an initial context setup complete (initial context setup complete) to the MME.
  • the MME sends a modify bearer request (modify bearer request) to the SGW.
  • the SGW sends a modify bearer response (modify bearer response) to the MME.
  • S14-S17 are the procedures for the terminal device to establish or modify the core network side bearer.
  • the SGW sends downlink data to the access network device.
  • the access network device sends the downlink data to the terminal device.
  • S18-S19 are the process in which the SGW sends downlink data to the terminal device through the access network device.
  • the first solution is called a user plane solution.
  • data is transmitted through SGW-access network equipment-terminal equipment.
  • the second solution is called the control plane solution.
  • data is transmitted through SGW-MME-access network equipment-terminal equipment, data is forwarded through MME, and terminal equipment interacts with MME.
  • the message is called a non-access stratum (NAS) message, that is, data is interacted with terminal equipment through NAS messages.
  • NAS non-access stratum
  • AS access stratum
  • early downlink data transmission may refer to sending downlink data to the terminal device before the message 3 (Msg 3) in the random access process, for example, carrying downlink data in a paging message, or in a paging message Then send the downlink data, or send the downlink data after receiving the random access preamble, or carry the downlink data in the RAR message, or send the downlink data after the RAR message.
  • Msg 3 message 3
  • the current flow of the downlink data early transmission method is not sufficiently considered in application, which affects communication efficiency. For example, if the downlink data is carried in the paging message, the load of the paging message will be too heavy.
  • the current early data transmission method does not solve the problem of how to feed back downlink data transmission.
  • the paging message may carry uplink resources for the terminal device to feed back an indication of whether the downlink data is successfully received. Since the paging message is oriented to multiple terminals, that is, multiple terminals can receive the same paging message, and because the uplink resource is for individual terminals, the terminal will receive the uplink resources configured for other terminals, which increases the number of terminals. Power consumption for receiving paging messages. Furthermore, since paging messages will be sent in multiple cells, this will increase the network-side resource overhead in one step, resulting in waste of resources.
  • Figure 5-1 is a schematic flowchart of a communication method according to an embodiment of the present application. The method in Figure 5-1 can be applied to the scenario of early downlink data transmission. As shown in Figure 5-1, the method includes:
  • the terminal device determines a first identifier, where the first identifier is used by the terminal device to monitor downlink data.
  • the downlink data may be user plane data (user plane data), or the downlink data may be unicast downlink data (unicast data).
  • the terminal device is in an idle state or an inactive state.
  • the first identifier may be used for the terminal device to monitor downlink data in an idle state or an inactive state.
  • the embodiment of the application does not limit the type of the first identifier.
  • the first identifier may be a radio network temporary identifier (RNTI) or a cell radio network temporary identifier (cell-RNTI, C-RNTI) or a downlink radio network temporary identifier (downlink-RNTI, D-RNTI) used for early transmission of downlink data.
  • RNTI radio network temporary identifier
  • cell-RNTI cell radio network temporary identifier
  • C-RNTI cell radio network temporary identifier
  • D-RNTI downlink radio network temporary identifier
  • the embodiment of the present application does not limit the manner of obtaining the first identifier.
  • the first identifier can be carried in a paging message sent by the access network device to the terminal device, or can be carried in an RRC connection release message sent by the access network device to the terminal device, or can be carried in the access network
  • the RRC early data transmission complete message sent by the device to the terminal device or it may be carried in the RAR message sent by the access network device to the terminal device, or the first identifier may be carried in other types of messages, or the first
  • the identification can be determined by the terminal device itself.
  • the terminal device and the access network device may determine the first identifier according to the same rule.
  • the terminal device receives a first message from an access network device according to the first identifier, where the first message includes the downlink data and resource configuration information, and the resource configuration information is used to indicate a first resource.
  • the first resource is used by the terminal device to send feedback information of the downlink data.
  • the resource configuration information indicates a first resource
  • the first resource is used by the terminal device to send feedback information of the downlink data.
  • the first resource is used by the terminal device to send feedback information about whether the downlink data is received.
  • the foregoing feedback information of whether the downlink data is received may include positive acknowledgement (acknowledge, ACK) information and negative acknowledgement (NACK) information.
  • the first resource may be a time domain resource, a frequency domain resource or a code resource.
  • the foregoing first resource may include a physical random access channel (PRACH) resource or a physical uplink control channel (PUCCH) resource.
  • PRACH physical random access channel
  • PUCCH physical uplink control channel
  • the present application by carrying the information indicating the feedback resource in the first message including the downlink data sent to the terminal, it is possible to avoid carrying the information indicating the feedback resource through the paging message. In this way, the size of the paging message can be reduced, thereby reducing the power consumption of the unpaged terminal receiving the paging message. In addition, for the network, the resource overhead of sending paging messages in multiple cells can be reduced.
  • the resource configuration information further includes first information, and the first information is used to indicate the effective time of the first resource.
  • the effective time can be used to indicate a preset third time period, the terminal device can use the first resource during the preset third time period, and the first resource becomes invalid after the preset third time period .
  • the first resource is a periodic resource
  • the effective time may be represented by the number of times the first resource is used.
  • the first information is used to indicate the number of times the first resource is used.
  • the PRACH resource or the PUCCH resource is periodic, the first information may be used to configure the number of uses of the PRACH resource or the PUCCH resource.
  • the foregoing first resource may include a second resource and a third resource
  • the second resource may be used to feed back ACK information
  • the second resource may be used to feed back NACK information.
  • two sets of PRACH resources or two sets of PUCCH resources can be configured, one set of resources is used to feed back ACK information, and the other set of resources is used to feed back NACK.
  • the embodiment of the present application does not limit the type of the foregoing first message.
  • the first message may be a RAR message, or the first message is another type of message.
  • the terminal device may descramble the monitored data according to the first identifier to obtain the downlink data.
  • the terminal device may also receive a paging message sent by the access network device.
  • the paging message may include the identification of the terminal device.
  • the paging message may be used to indicate that the core network has downlink data transmitted to the terminal device.
  • the downlink data may not be carried in the paging message, thereby reducing the impact on the load of the paging message.
  • the first message is an RRC message dedicated to the terminal device.
  • the first message may be an RRC connection release message or an early RRC data transmission complete message, or other types of dedicated RRC messages.
  • the RRC connection release message may carry the first identifier, or the RRC connection release message may carry downlink data, resource configuration information, and the first identifier .
  • the above-mentioned first identifier can be used to monitor downlink data next time when data is transmitted early.
  • the first identifier used to monitor the downlink data this time may be carried in the RRC connection release message sent last time.
  • the RRC data early transmission complete message may carry the first identifier.
  • the above-mentioned first identifier can be used to monitor downlink data next time when data is transmitted early.
  • the first identifier used to monitor the downlink data this time may be carried in the RRC data early transmission complete message sent last time.
  • Fig. 5-2 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • the method in Figure 5-2 can be applied to the scenario of early downlink data transmission.
  • the method includes:
  • the terminal device determines a first identifier, where the first identifier is used by the terminal device to monitor downlink data in an idle state or an inactive state.
  • the downlink data may be user plane data (user plane data), or the downlink data may be unicast downlink data (unicast data).
  • the terminal device is in an idle state or an inactive state.
  • the first identifier may be used for the terminal device to monitor downlink data in an idle state or an inactive state.
  • the embodiment of the present application does not limit the type of the first identifier.
  • the first identifier may be a radio network temporary identifier (RNTI) or a cell radio network temporary identifier (cell-RNTI, C-RNTI) or a downlink radio network temporary identifier (downlink-RNTI, D-RNTI) used for early transmission of downlink data.
  • RNTI radio network temporary identifier
  • cell-RNTI cell radio network temporary identifier
  • C-RNTI cell radio network temporary identifier
  • D-RNTI downlink radio network temporary identifier
  • the embodiment of the present application does not limit the manner of obtaining the first identifier.
  • the first identifier can be carried in a paging message sent by the access network device to the terminal device, or can be carried in an RRC connection release message sent by the access network device to the terminal device, or can be carried in the access network
  • the RRC early data transmission complete message sent by the device to the terminal device or it may be carried in the RAR message sent by the access network device to the terminal device, or the first identifier may be carried in other types of messages, or the first
  • the identification can be determined by the terminal device itself.
  • the terminal device and the access network device may determine the first identifier according to the same rule.
  • the terminal device receives control information from the access network device according to the first identifier, the control information is used for scheduling the downlink data, the control information includes resource configuration information, and the resource configuration information is used for Indicates a first resource, where the first resource is used by the terminal device to send feedback information of the downlink data.
  • control information may be downlink control information (downlink control information, DCI).
  • DCI downlink control information
  • control information may be carried in a RAR message.
  • the resource configuration information indicates a first resource
  • the first resource is used by the terminal device to send feedback information of the downlink data.
  • the first resource is used by the terminal device to send feedback information about whether the downlink data is received.
  • the foregoing feedback information of whether the downlink data is received may include positive acknowledgement (acknowledge, ACK) information and negative acknowledgement (NACK) information.
  • the first resource may be a time domain resource, a frequency domain resource or a code resource.
  • the foregoing first resource may include physical random access channel (PRACH) resources or physical uplink control channel (PUCCH) resources.
  • PRACH physical random access channel
  • PUCCH physical uplink control channel
  • the present application by carrying the information indicating the feedback resource in the control information sent to the terminal, it is possible to avoid carrying the information indicating the feedback resource through the paging message. In this way, the size of the paging message can be reduced, thereby reducing the power consumption of the unpaged terminal receiving the paging message. In addition, for the network, the resource overhead of sending paging messages in multiple cells can be reduced.
  • the terminal device may monitor downlink data or monitor control information for scheduling downlink data according to the first identifier, to obtain the downlink data.
  • the terminal device may also receive a paging message sent by the access network device.
  • the paging message may include the identification of the terminal device.
  • the paging message may be used to indicate that the core network has downlink data transmitted to the terminal device.
  • the downlink data may not be carried in the paging message, thereby reducing the impact on the load of the paging message.
  • the resource configuration information can be sent simultaneously with the downlink data, or can also be sent separately from the downlink data, that is, the resource configuration information and the downlink data do not have to be carried in the same message.
  • the resource configuration information can be sent separately after the paging message, or sent along with the downlink data after the paging message, thereby reducing the impact on the load of the paging message.
  • the downlink data may be transmitted in a control plane scheme, or may be transmitted in a user plane scheme.
  • FIG. 6 depicts an example of transmission using a control plane scheme in an embodiment of the present application
  • FIG. 7 depicts an example of transmission using a user plane scheme in an embodiment of the present application.
  • the first message in the transmission mode using the user plane solution, may also carry a next hop chaining count (NCC).
  • NCC next hop chaining count
  • the downlink data may be encapsulated in NAS PDU.
  • the first message may also carry a resume ID (resume ID).
  • the aforementioned downlink data may be carried in the first message, or may be carried in other messages.
  • the first message may carry the downlink data and the resource configuration information at the same time.
  • the first message may be a RAR message.
  • the access network device sends a PDCCH after sending a paging message to the terminal device, and the PDCCH is used to schedule a physical downlink shared channel (PDSCH), and the PDSCH is used for Carry RRC message
  • the RRC message can carry NAS protocol data unit (protocol data unit, PDU).
  • PDU protocol data unit
  • the NAS PDU can carry downlink data.
  • the RRC message may also carry the resource configuration information.
  • the access network device sends the PDCCH after sending the paging message to the terminal device, and the PDCCH is used to schedule the PDSCH.
  • the PDSCH may carry RRC messages and downlink data, and the RRC messages may also carry resource configuration information and NCC.
  • the difference between the first method and the second method is that the first method is a control plane transmission scheme, and the second method is a user plane transmission scheme.
  • the access network device can send downlink control information (DCI) to the terminal device, and the DCI can be used to schedule downlink data.
  • DCI downlink control information
  • the DCI is carried in a RAR message (ie, Msg2).
  • the terminal device may receive downlink data according to the DCI.
  • DCI is not limited to being carried in RAR messages, and can also be carried in other types of messages.
  • the access network device may send a first message to the terminal device, and the first message includes the resource configuration information and downlink data.
  • the downlink data can be carried in a dedicated traffic channel (DTCH).
  • the downlink data may be carried in a common control channel (CCCH), and the CCCH is included in an RRC message.
  • the RAR message may include the resource configuration information
  • the RAR message and the RRC message may be multiplexed at the medium access control (MAC) layer to form a MAC PDU
  • the first message may include The MAC PDU.
  • MAC medium access control
  • the terminal device stops using the first identifier to monitor the downlink data; or, if the downlink data is not monitored during the preset first period of time; It is assumed that the downlink data is not monitored in the second time period, and the terminal device initiates a random access procedure or an RRC connection establishment procedure.
  • the random access process may include steps S4-S7 in FIG. 4, and the RRC connection establishment process may include steps S4-S8 in FIG. 4.
  • the terminal device can start a random access process without listening to the downlink data, so that the terminal device changes from the idle state to the connected state, so as to receive the downlink data in the connected state, so as to avoid being unable to The problem of receiving the downlink data in time to improve the timeliness of downlink data transmission.
  • the terminal device may delete the previously saved first identifier. If the terminal device undergoes cell reselection, the first identifier may not be applicable to the reselected cell. Therefore, the terminal device can delete the saved first identifier and no longer use the first identifier to monitor the downlink channel to reduce the function of the terminal device. Consumption.
  • Fig. 6 is a flowchart of a communication method according to another embodiment of the present application.
  • Figure 6 uses the control plane communication scheme. As shown in Figure 6, the method includes the following steps:
  • the core network device sends an S1 paging message to the access network device.
  • the paging message sent by the core network device to the access network device is via the S1 interface
  • the paging message can be referred to as an S1 paging message.
  • the S1 paging message may carry S-TMSI and NAS PDU.
  • the NAS PDU carries the downlink data of the terminal device.
  • the downlink data may be small data.
  • the foregoing core network equipment may be MME, AMF or other types of core network equipment.
  • the access network device allocates a first identifier to the terminal device corresponding to the S-TMSI.
  • the first identifier may be RNTI.
  • the access network device when the access network device receives the S1 paging message, it can confirm that the terminal device corresponding to the S-TMSI is paged and that it has downlink small data or a downlink data packet, and the access network device Allocate a first identifier, such as RNTI, to the terminal device.
  • the first identifier is used by the terminal device to monitor downlink data.
  • the terminal device is in an idle state or an inactive state.
  • the access network device sends a Uu paging message to the terminal device, and the Uu paging message carries the first identifier.
  • the Uu paging message may carry S-TMSI and RNTI.
  • the terminal device receives the Uu paging message and determines that it is paged according to the S-TMSI carried in the paging message.
  • the terminal device determines that the Uu paging message carries the first identifier, such as RNTI, the terminal device determines that it has downlink data coming.
  • the paging message is applied to other communication systems, such as a 5G system, other names can also be used, which is not limited in this embodiment of the application.
  • the terminal device uses the first identifier to monitor the PDCCH for scheduling downlink data.
  • the time for the terminal device to monitor the PDCCH can be preset. If the PDCCH is not monitored within the preset first time period, the terminal device stops using the first identifier to monitor the PDCCH.
  • the terminal device may initiate a random access procedure to the access network device.
  • the PDCCH may be a machine type communication PDCCH (machine type communication PDCCH, MTC PDCCH, MPDCCH) or a narrowband PDCCH (narrowband PDCCH, NPDCCH).
  • machine type communication PDCCH machine type communication PDCCH, MTC PDCCH, MPDCCH
  • narrowband PDCCH narrowband PDCCH
  • the access network device allocates a first resource to the terminal device, where the first resource is used by the terminal device to send feedback information of the downlink data.
  • the first resource may be a PRACH resource or a PUCCH resource.
  • the access network device may also determine the effective time of the PRACH resource or PUCCH resource.
  • the effective time please refer to the relevant description in the example in FIG. 5.
  • the PRACH resource may include one or more of PRACH configuration index (prach-config index), preamble index (ra-preamble index), and PRACH mask index (ra-PRACH-mask index).
  • PRACH configuration index prach-config index
  • preamble index ra-preamble index
  • PRACH mask index ra-PRACH-mask index
  • the PUCCH resource may include ACK/NACK resource index, frequency domain sequence cyclic shift, and so on.
  • step S605 may be executed before S603, or may be executed after S603. That is, it can be executed before or after the access network device sends the Uu paging message to the terminal device, which is not limited in the embodiment of the present application.
  • S605 can be executed simultaneously with S602.
  • the access network device sends downlink data.
  • the access network device sends a PDCCH after sending a Uu paging message to the terminal device, and the PDCCH is used to schedule downlink data.
  • the downlink data is carried on the PDSCH.
  • the PDSCH is used to carry RRC messages.
  • the RRC message can carry NAS PDU.
  • the NAS PDU can carry downlink data.
  • the RRC message may also carry the resource configuration information.
  • the resource configuration information is used to indicate the first resource allocated in S605.
  • the resource configuration information may also carry first information, and the first information is used to indicate the effective time of the first resource.
  • the access network device sends an RRC message.
  • the RRC message and downlink data are multiplexed at the MAC layer to form a MAC PDU, which is scheduled to be sent via the PDCCH.
  • the above valid time may be k time units, and k is an integer greater than or equal to 1.
  • the aforementioned time unit may refer to time units such as frames, subframes, and symbols.
  • the access network device monitors or receives feedback information sent by the terminal device.
  • the access network device may obtain feedback information of downlink data sent by the terminal device by monitoring PRACH or PUCCH.
  • the terminal device uses the first resource to send feedback information of downlink data.
  • the terminal device uses the first resource to send the ACK in the preset third time period.
  • the terminal device can use the PUCCH to send ACK or NACK.
  • TA timing advance
  • the access network device sends feedback information to the core network device to indicate whether the downlink data is successfully sent to the terminal device.
  • the access network device monitors the feedback information sent by the terminal device, the access network device sends NAS PDU or feedback information of downlink data to the core network device to indicate that the downlink data is successfully sent to the terminal device. Or, if the access network device does not receive the feedback information sent by the terminal device within the preset time, or the received feedback information is NACK, the access network device sends the NACK feedback information of NAS PDU to the core network device to indicate the downlink The data was not successfully sent to the terminal device.
  • Fig. 7 is a flowchart of a communication method according to another embodiment of the present application.
  • Figure 7 uses the user plane solution. As shown in Figure 7, the method includes the following steps.
  • the second core network device sends a downlink data instruction to the first core network device.
  • the downlink data indication may carry a first indication indicating that the terminal device has downlink data.
  • the downlink data may be downlink small data or a downlink data packet.
  • the second core network device may be an SGW, and the first core network device may be an MME.
  • the second core network device and the first core network device may also be other types of devices that can implement related functions.
  • the first core network device sends an S1 paging message to the access network device, where the S1 paging message may carry the S-TMSI and the foregoing first indication.
  • the S1 paging message may also carry a second indication, and the second indication may be used to indicate one or more access network devices.
  • the one or more access network devices are access network devices that have a higher probability of serving the terminal device.
  • the MME can learn the access network equipment corresponding to the serving cell of the terminal equipment in the last connection process.
  • the terminal equipment has a greater probability of being in the previous access network.
  • the foregoing S1 paging message may include at least one of the first indication and the second indication.
  • S703 Perform a path switch (path switch) process between the access network device and the first core network device.
  • the access network device may send a path switch request message to the MME.
  • the MME receives a path switch request sent by the access network device, the MME sends a bearer modification request message to the SGW, and accordingly, the SGW sends a bearer modification response message to the MME.
  • the MME sends a path forwarding response message to the access network device
  • S705 The second core network device sends downlink data to the access network device.
  • the access network device allocates a first identifier to the terminal device.
  • the access network device For example, if the access network device receives the S1 paging message from the MME, it is confirmed that the terminal device corresponding to the S-TMSI is paged. If the S1 paging message contains the first indication and/or the second indication, the access network device allocates the first identifier to the terminal device.
  • the first identifier may be an RNTI, and the RNTI is used for the terminal equipment to monitor downlink data in an idle state or an inactive state.
  • the access network device sends a Uu paging message to the terminal device, where the Uu paging message carries the first identifier.
  • the Uu paging message may carry S-TMSI and RNTI.
  • the terminal device receives the Uu paging message, and determines that it is paged according to the S-TMSI carried in the paging message.
  • the terminal device determines that downlink data has arrived.
  • the terminal device may activate the UE context and the security context, and derive the key according to the stored NCC.
  • the terminal device may activate the UE context and the security context, and derive the key according to the stored NCC.
  • the terminal device uses the first identifier to monitor the downlink data.
  • the terminal device uses the first identifier to monitor the PDCCH scheduling downlink data.
  • the terminal device stops using the first identifier to monitor the PDCCH.
  • the preset first time period may be configured by the access network or predefined.
  • the terminal device may initiate a random access procedure to the access network device.
  • the access network device allocates a first resource to the terminal device, where the first resource is used by the terminal device to send feedback information of the downlink data.
  • the first resource may be a PRACH resource or a PUCCH resource.
  • the access network device may also determine the effective time of the PRACH resource or PUCCH resource.
  • the effective time refer to the related description in FIG. 5.
  • the PRACH resource may include one or more of PRACH configuration index (prach-config index), preamble index (ra-preamble index), and PRACH mask index (ra-PRACH-mask index).
  • PRACH configuration index prach-config index
  • preamble index ra-preamble index
  • PRACH mask index ra-PRACH-mask index
  • the PUCCH resources may include ACK/NACK resource index and frequency domain sequence cyclic shift.
  • step S709 may be executed before S707, or may be executed after S707. That is, it can be executed before or after the access network device sends the Uu paging message to the terminal device, which is not limited in the embodiment of the present application.
  • S709 can be executed simultaneously with S706.
  • the access network device sends downlink data.
  • the access network device sends a PDCCH after sending a Uu paging message to the terminal device, and the PDCCH is used to schedule downlink data.
  • the downlink data is carried on the PDSCH.
  • the PDSCH may carry RRC messages and downlink data, and the RRC messages may carry resource configuration information and NCC.
  • the NCC can be used to derive the key next time.
  • the resource configuration information is used to indicate the first resource allocated in S709.
  • the RRC message may also carry first information, and the first information is used to indicate the effective time of using the first resource.
  • the above valid time may be k time units, and k is an integer greater than or equal to 1.
  • the aforementioned time unit may refer to time units such as frames, subframes, and symbols.
  • the access network device monitors the feedback information sent by the terminal device.
  • the access network device may obtain feedback information of downlink data sent by the terminal device by monitoring PRACH or PUCCH.
  • S712 The terminal device uses the first resource to send feedback information about whether downlink data is received.
  • the terminal device uses the first resource to send the ACK in the preset third time period.
  • the terminal device can use PUCCH to send ACK or NACK.
  • the NCC is saved.
  • the access network device sends feedback information to the second core network device to indicate whether the downlink data is successfully sent to the terminal device.
  • the access network device monitors the feedback information sent by the terminal device, the access network device sends feedback information of downlink data to the MME or SGW to indicate that the downlink data is successfully sent to the terminal device. Or, if the access network device does not receive the feedback information sent by the terminal device within the preset time period, or the received feedback information is NACK, the access network device sends the NACK feedback information of the downlink data to the MME or SGW, indicating Downlink data was not successfully sent to the terminal device.
  • FIG. 8 is a schematic diagram of a specific flow of a communication method according to another embodiment of the present application.
  • Figure 8 shows the user plane solution. As shown in Figure 8, the method includes the following steps.
  • the first core network device sends an S1 paging message to the access network device, and the S1 paging message may carry S-TMSI and a downlink data indication (downlink data indication).
  • the downlink data indication may be used to indicate that downlink data has arrived.
  • the downlink data indication may be used to indicate that only one downlink data packet has arrived.
  • the first core network device may be an MME.
  • the access network device allocates a fourth resource to the terminal device, where the fourth resource is used by the terminal device to request downlink data.
  • the fourth resource is used by the terminal device to indicate to the access network device that the Uu paging message is successfully received.
  • the access network device determines, according to the S1 paging message received from the MME, that the terminal device identified as the S-TMSI has downlink data arrival, then the access network The device allocates a fourth resource to the terminal device.
  • the fourth resource may be a PRACH resource or a PUCCH resource.
  • PRACH resources and PUCCH resources For detailed configuration information of PRACH resources and PUCCH resources, refer to the foregoing description.
  • the access network device sends a Uu paging message to the terminal device, where the Uu paging message may carry the S-TMSI and the information indicating the fourth resource.
  • the terminal device receives the Uu paging message from the access network device.
  • the Uu paging message carries a first identifier, and the first identifier is used by the terminal device to monitor downlink data.
  • the terminal device sends a downlink data request to the access network device according to the Uu paging message.
  • the downlink data request is implicitly indicated.
  • the terminal device uses the first resource to send an uplink signal to the access network device, where the uplink signal is used to indicate a downlink data request.
  • the access network device receives the downlink data request from the terminal device. For example, if the access network device receives an uplink signal sent by the terminal device on the first resource, the access network device confirms that the terminal device has sent a downlink data request.
  • the access network device sends a path switch request (path switch request) to the first core network device according to the downlink data request.
  • the first core network device receives the path conversion request from the access network device.
  • the first core network device sends a modify bearer request (modify bearer request) to the second core network device according to the path conversion request.
  • the second core network device receives the modify bearer request from the first core network device.
  • the second core network device may be an SGW.
  • the second core network device sends a modify bearer response (modify bearer response) to the first core network device in response to the modify bearer request.
  • the first core network device receives the modified bearer response from the second core network device.
  • the first core network device sends a path switch request acknowledgment (path switch request ack) to the access network device according to the modified bearer response.
  • the access network device receives the path conversion request acknowledgement from the first core network device.
  • the access network device receives downlink data from the second core network device.
  • the access network device sends a first message to the terminal device, where the first message includes the downlink data and resource configuration information, and the resource configuration information is used to indicate a first resource. Used to send feedback information of the downlink data.
  • the first message further includes timing advance (TA).
  • TA timing advance
  • the first message further includes NCC.
  • the first resource is a PUCCH resource or a PRACH resource.
  • the terminal device receives the first message from the access network device.
  • the terminal device may determine the first identifier according to the fourth resource, and the first identifier is used by the terminal device to access the network from the access network.
  • the device receives the first message.
  • S811 The terminal device sends feedback information of the downlink data to the access network device according to the first message.
  • the feedback information includes positive indication (ACK) and/or negative indication (NACK).
  • ACK positive indication
  • NACK negative indication
  • the terminal device uses the PUCCH resource and the TA to send the affirmation Instruction or negative instruction.
  • the terminal device uses the PUCCH resource and all The valid TA sends the positive or negative indication.
  • the terminal device uses the PRACH resource to send the positive or negative indication.
  • the PRACH resource for example, a dedicated preamble and/or a dedicated time-frequency resource for sending the preamble
  • the access network device sends second feedback information to the first core network device or the second core network device according to the feedback information, and the second feedback information is used for the access
  • the network access device indicates to the first core network device or the second core network device that the downlink data is successfully sent to the terminal device.
  • FIG. 9 is a schematic diagram of a specific flow of a communication method according to another embodiment of the present application.
  • the method shown in Figure 9 is a control plane solution. As shown in Figure 9, the method includes the following steps.
  • S901 to S904 are the same as or similar to S801 to S804 in FIG. 8, and will not be repeated here.
  • the access network device sends an initial UE message (initial UE message) to the first core network device according to the downlink data request.
  • the first core network device receives the initialization UE message from the access network device.
  • the first core network device may be, for example, an MME.
  • the first core network device sends a downlink NAS message (downlink NAS message) or a connection establishment indication message (connection establishment indication message) to the access network device according to the UE initialization message, wherein the downlink NAS message Or the connection establishment instruction message carries the downlink data.
  • a downlink NAS message downlink NAS message
  • a connection establishment indication message connection establishment indication message
  • the access network device sends a first message to the terminal device, where the first message includes the downlink data and resource configuration information, and the resource configuration information is used to indicate a first resource. Used to send feedback information of the downlink data.
  • the first message further includes timing advance (TA).
  • TA timing advance
  • the first resource is a PUCCH resource or a PRACH resource.
  • the terminal device receives the second message from the access network device.
  • S908 The terminal device sends feedback information of the downlink data to the access network device according to the first message.
  • the feedback information includes positive indication (ACK) and/or negative indication (NACK).
  • ACK positive indication
  • NACK negative indication
  • the terminal device uses the PUCCH resource and the TA to send the affirmation Instruction or negative instruction.
  • the terminal device uses the PUCCH resource and all The valid TA sends the positive or negative indication.
  • the second message contains PRACH resources (for example, dedicated preamble and/or dedicated time-frequency resources for sending the preamble) for sending feedback information of the downlink data
  • PRACH resources for example, dedicated preamble and/or dedicated time-frequency resources for sending the preamble
  • the access network device sends second feedback information to the first core network device according to the feedback information, where the second feedback information is used by the access network device to report to the first core network device.
  • the core network device indicates that the downlink data is successfully sent to the terminal device.
  • FIG. 10 is a flowchart of a communication method in another embodiment of the present application.
  • Figure 10 shows a method for early data transmission in the case of cell reselection.
  • the solution shown in FIG. 10 is the control plane communication, and those skilled in the art can understand that this method is also applicable to the user plane communication solution.
  • the method includes the following steps.
  • the access network device sends a first identifier to the terminal device.
  • the foregoing first identifier may be carried in an RRC connection release message or an RRC early data transmission complete message sent by the access network device to the terminal device.
  • the foregoing first identifier may be, for example, D-RNTI or RNTI.
  • the first identifier may be used for the terminal device to monitor downlink data at a paging occasion (PO).
  • PO paging occasion
  • the paging moment may refer to the moment for receiving paging.
  • the terminal device saves the first identifier after receiving the RRC connection release message or the RRC early data transmission complete message.
  • the access network device saves the first identifier and the S-TMSI of the terminal device.
  • the core network device sends an S1 paging message to the access network device, where the S1 paging message carries the S-TMSI of the terminal device.
  • the S1 paging message carries a NAS PDU, or the core network device uses other messages to send the NAS PDU to the access network device.
  • the NAS PDU includes downlink data of the terminal device.
  • the core network equipment may be an MME.
  • the S1 paging message may also carry a downlink data indication.
  • the terminal device uses the first identifier to monitor and schedule the first message at the paging moment.
  • the terminal device uses the first identifier to monitor the PDCCH, and the PDCCH schedules the first message.
  • the terminal device may use a paging RNTI (paging RNTI, P-RNTI) in an idle state to monitor the PDCCH scheduling the paging message, and use the first identifier to monitor the PDCCH scheduling the first message.
  • a paging RNTI paging RNTI, P-RNTI
  • the terminal device deletes the stored first identifier, such as D-RNTI.
  • the terminal device performs S1003.
  • the terminal device still uses the same first identifier to monitor the downlink data after the cell reselection occurs.
  • the terminal device may use the same first identifier in several adjacent cells.
  • the terminal device may delete the previously saved first identifier.
  • the access network device sends a first message to the terminal device, where the first message carries a NAS PDU, and the NAS PDU includes the downlink data.
  • the access network device receives the S1 paging message and NAS PDU sent by the core network device, and determines the terminal device identified by the S-TMSI and the terminal device corresponding to the terminal device according to the S-TMSI in the S1 paging message.
  • the first logo The access network device uses the first identifier to send a first message.
  • the access network device uses the first identifier to scramble a PDCCH, the PDCCH schedules a PDSCH, and the PDSCH carries the first message.
  • the first message may be an RRC message, and in a possible implementation manner, the PDSCH is used to carry the RRC message.
  • the RRC message may carry NAS PDU.
  • the NAS PDU can carry downlink data.
  • the first message may also carry the resource configuration information.
  • the resource configuration information is used to indicate the first resource.
  • the first resource is used by the terminal device to send feedback information about whether the downlink data is received.
  • the first resource includes PARCH resource or PUCCH resource.
  • the resource configuration information may also carry a valid time, and the valid time is used to indicate the time when the first resource can be used.
  • the above effective time period may be k time units, and k is an integer greater than or equal to 1.
  • the aforementioned time unit may refer to time units such as frames, subframes, and symbols.
  • step S1004 may not be performed. That is, step S1004 is an optional step.
  • Steps S1005-S1007 are the same as or similar to steps S607-S609 in FIG. 6, and are not repeated here for brevity.
  • FIG. 11 is a schematic structural diagram of a terminal device 1100 according to an embodiment of the present application. It should be understood that the terminal device 1100 can execute each step performed by the terminal device in the methods in FIGS. 1 to 10, and in order to avoid repetition, details are not described herein again.
  • the terminal device 1100 includes: a processing unit 1110 and a communication unit 1120.
  • the processing unit 1110 is configured to determine a first identifier, where the first identifier is used by the terminal device to monitor downlink data in an idle state or an inactive state;
  • the communication unit 1120 is configured to receive a first message from an access network device, the first message including resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used by the terminal device to send Feedback information of the downlink data;
  • the processing unit 1110 is further configured to monitor the downlink data according to the first identifier.
  • FIG. 12 is a schematic structural diagram of an access network device 1200 according to an embodiment of the present application. It should be understood that the access network device 1200 can execute the steps performed by the access network device in the methods in FIG. 1 to FIG. 10, and in order to avoid repetition, details are not described herein again.
  • the access network device 1200 includes: a sending unit 1210 and a sending unit 1220.
  • the sending unit 1210 is configured to send a first message to a terminal device, the first message including resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used for the terminal device to send downlink data Feedback information, wherein the downlink data is monitored by the terminal device in an idle state or an inactive state;
  • the receiving unit 1220 is configured to receive the feedback information from the terminal device.
  • FIG. 13 is a schematic structural diagram of a terminal device 1300 according to an embodiment of the present application. It should be understood that the terminal device 1300 can execute each step performed by the terminal device in the methods in FIGS. 1 to 10, and in order to avoid repetition, details are not described herein again.
  • the terminal device 1300 includes:
  • the memory 1310 is used to store programs
  • Communication interface 1320 used to communicate with other devices
  • the processor 1330 is configured to execute a program in the memory 1310, and when the program is executed,
  • the processor 1330 is configured to determine a first identifier, where the first identifier is used for the terminal device to monitor downlink data in an idle state or an inactive state; and for receiving a first message from an access network device, the first identifier A message includes resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used for the terminal device to send feedback information of the downlink data; and is used for monitoring according to the first identifier The downlink data.
  • FIG. 14 is a schematic structural diagram of an access network device 1400 according to an embodiment of the present application. It should be understood that the access network device 1400 can execute each step performed by the access network device in the methods in FIGS. 1 to 10, and in order to avoid repetition, details are not described herein again.
  • the access network equipment 1400 includes:
  • the memory 1410 is used to store programs
  • Communication interface 1420 used to communicate with other devices
  • the processor 1430 is configured to execute a program in the memory 1410, and when the program is executed,
  • the processor 1430 is configured to send a first message to the terminal device, the first message including resource configuration information, the resource configuration information is used to indicate a first resource, and the first resource is used by the terminal device to send downlink Data feedback information, where the downlink data is monitored by the terminal device in an idle state or in an inactive state; and used to receive the feedback information from the terminal device.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and 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 they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology 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 method described in each embodiment 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 disk and other media that can store program code .

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  • Engineering & Computer Science (AREA)
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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé et un appareil de communication permettant d'améliorer l'efficacité de la communication. Le procédé comprend les étapes suivantes : un dispositif terminal détermine un premier identifiant, le premier identifiant étant utilisé pour que le dispositif terminal surveille des données de liaison descendante dans un état de veille ou un état inactif ; et en fonction du premier identifiant, le dispositif terminal reçoit un premier message en provenance d'un dispositif de réseau d'accès, le premier message comprenant les données de liaison descendante et des informations de configuration de ressource, les informations de configuration de ressource étant utilisées pour indiquer une première ressource, et la première ressource étant utilisée pour que le dispositif terminal envoie des informations de retour des données de liaison descendante.
PCT/CN2019/076446 2019-02-28 2019-02-28 Procédé et appareil de communication Ceased WO2020172844A1 (fr)

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