WO2023029884A1 - 通信方法及装置 - Google Patents

通信方法及装置 Download PDF

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Publication number
WO2023029884A1
WO2023029884A1 PCT/CN2022/110620 CN2022110620W WO2023029884A1 WO 2023029884 A1 WO2023029884 A1 WO 2023029884A1 CN 2022110620 W CN2022110620 W CN 2022110620W WO 2023029884 A1 WO2023029884 A1 WO 2023029884A1
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WIPO (PCT)
Prior art keywords
indication information
terminal
signaling
message
positioning
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PCT/CN2022/110620
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English (en)
French (fr)
Inventor
郝金平
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华为技术有限公司
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Publication of WO2023029884A1 publication Critical patent/WO2023029884A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present application relates to the technical field of communication, and in particular to a communication method and device.
  • a signaling radio bearer (signalling radio bearer, SRB) 2 is used to transmit a non-access stratum (non-access stratum, NAS) message.
  • the establishment of SRB2 is accompanied by the establishment of a data radio bearer (DRB). In some cases, this may affect the proper communication.
  • DRB data radio bearer
  • the present application provides a communication method and device in order to ensure normal communication.
  • a communication method includes: a terminal sends indication information to an access network device, where the indication information is used to indicate at least one of the following: perform positioning, terminal type, or transmit signaling; and The terminal receives a radio resource control (radio resource control, RRC) message from the access network device, and the RRC message configures SRB2 and does not configure DRB for the terminal.
  • RRC radio resource control
  • the terminal can make the access network device know clearly that there is no need to establish a DRB for the terminal, so as to decide not to establish a DRB for the terminal, which can ensure normal communication.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce terminal processing complexity, reduce communication delay, and reduce the impact on key business performance indicators.
  • a communication method comprising: an access network device receiving indication information from a terminal, where the indication information is used to indicate at least one of the following: perform positioning, terminal type, or transmit signaling;
  • the access network device sends an RRC message to the terminal, and the RRC message configures SRB2 and does not configure DRB for the terminal.
  • the access network device can clearly know that there is no need to establish a DRB for the terminal, and thus decide not to establish a DRB for the terminal, which can ensure normal communication.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce communication delay, and reduce the impact on key business performance indicators.
  • the indication information when used to indicate positioning, includes at least one of the following: positioning, positioning signaling, positioning services, Or positioning service signaling.
  • the at least one piece of indication information can be used to clearly indicate positioning, which improves the processing efficiency of the access network equipment.
  • the indication information when used to indicate that the terminal type is a positioned terminal, the indication information includes at least one of the following: Node indication, or positioning indication.
  • the type of the terminal can be explicitly indicated as a positioned terminal, so that the access network device can decide that there is no need to establish a DRB for the terminal.
  • the indication information when used to indicate that the terminal type is a signaling transmission terminal, the indication information includes at least one of the following: Signaled node indication, or only signaled node indication.
  • the type of the terminal can be clearly indicated as a terminal for transmitting signaling, so that the access network device can decide that it is not necessary to establish a DRB for the terminal.
  • the indication information when used to indicate the transmission of signaling, includes at least one of the following: signaling, signaling only , or control signaling.
  • the indication information can be used to clearly indicate signaling transmission, which improves the processing efficiency of the access network equipment.
  • the indication information is included in the RRC establishment request message, and the indication information is an establishment reason; or the indication information is included in the RRC recovery request message , the indication information is the recovery reason; or the indication information is included in the RRC establishment completion message; or the indication information is included in the RRC recovery completion message.
  • carrying the indication information in any of the above messages can clearly indicate signaling transmission, which improves the processing efficiency of the access network device; and there is no need to send the indication information separately, saving signaling overhead.
  • a communication method includes: a terminal receives a second paging message from an access network device, the second paging message includes second indication information, and the second indication information uses Indicating at least one of the following: for positioning or signaling transmission; and the terminal sends a radio resource control RRC message to the access network device, and the RRC message is triggered by the second paging message.
  • the network triggers terminal access it may indicate in the paging message that the terminal is paged for positioning and/or signaling transmission, and the terminal is triggered to access for positioning and/or signaling transmission , therefore, the access network device will not configure the DRB for the terminal, which can ensure normal communication.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce terminal processing complexity, reduce communication delay, and reduce the impact on key business performance indicators.
  • a communication method includes: an access network device receives a first paging message from an access management function (access management function, AMF) network element, and the first paging message includes First indication information, where the first indication information is used to indicate at least one of the following: for positioning or signaling transmission; the access network device sends a second paging message to the terminal according to the first paging message message; and the access network device receives an RRC message from the terminal, the RRC message is triggered by the second paging message.
  • the second paging message includes second indication information, where the second indication information is used to indicate at least one of the following: for positioning or for signaling transmission.
  • the access network device performs paging according to the indication in the first paging message for locating/or signaling transmission, therefore, no DRB is configured for the terminal, and normal communication can be guaranteed.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce communication delay, and reduce the impact on key business performance indicators.
  • a communication method includes: an access management function (access management function, AMF) network element sends a first paging message to an access network device, and the first paging message includes the first paging message
  • AMF access management function
  • the first indication information is used to indicate at least one of the following: for positioning or for signaling transmission; and the access management function network element receives a non-access stratum (non-access stratum) access stratum, NAS) message, the NAS message is triggered by the first paging message.
  • the network triggers terminal access when it triggers terminal access, it may indicate in the paging message that paging is performed for positioning and/or paging for signaling transmission, so that the access network device knows that the paging is for paging and /or in order to transmit signaling, therefore, the access network device does not configure a DRB for the terminal, and can communicate normally.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce communication delay, and reduce the impact on key business performance indicators.
  • a communication method comprising: a terminal sends indication information to an access network device, where the indication information is used to indicate at least one of the following: perform positioning, transmit signaling, or a terminal type; and The terminal receives the NAS message from the AMF network element.
  • the terminal after the terminal accesses the network, it can notify the AMF that the purpose of this access is not to transmit service data, so that the AMF decides not to establish a session for the terminal, so that normal communication can be performed.
  • This method is especially suitable for positioning scenarios, which can save signaling resources and reduce communication delays.
  • a communication method includes: an access management function network element receives indication information from a terminal, and the indication information is used to indicate at least one of the following: performing positioning, transmitting signaling, or terminal type; the access management function network element determines not to establish a session; and the access management function network element sends a NAS message to the terminal.
  • the AMF receives a notification from the terminal that the purpose of this access is not to transmit service data, so that the AMF decides not to establish a session for the terminal, so that normal communication can be performed.
  • This method is especially suitable for positioning scenarios, which can save signaling resources and reduce communication delays.
  • the indication information when used to indicate positioning, includes at least one of the following: registration for positioning, positioning, or positioning business.
  • the at least one piece of indication information can be used to clearly indicate positioning, which improves the processing efficiency of the AMF.
  • the indication information is included in the registration request message, and the indication information is the first registration type; or the indication information is included in the control plane service request In the message, the indication information is the first control plane service type; or the indication information is included in the service request message, and the indication information is the first service type.
  • the AMF receives the registration request message/control plane service request message/service request message, and obtains the value of the 5G system registration type in it, when the registration type/control plane service type/service type is registered for positioning or On access, it can be explicitly determined that no session is established. Therefore, signaling resources can be saved and communication delay can be reduced.
  • the indication information when used to indicate the transmission of signaling, includes at least one of the following: registering for the transmission of control signaling , Transmission of control signaling only, control signaling only, signaling only, or signaling services.
  • at least one piece of indication information can be used to clearly indicate signaling transmission, which improves the processing efficiency of the AMF.
  • the indication information is included in the registration request message, and the indication information is the second registration type; or the indication information is included in the control plane service request In the message, the indication information is the second control plane service type; or the indication information is included in the service request message, and the indication information is the second service type.
  • the AMF receives the registration request message/control plane service request message/service request message, obtains the 5G system registration type value/control plane service type value/service type value, and when the registration type/control plane The plane service type/service type is determined not to establish a session when registering or accessing for transmission of control signaling. Therefore, signaling resources can be saved and communication delay can be reduced.
  • a communication device which can implement the communication method in the first aspect above.
  • the communication device may be a chip or a terminal.
  • the above method can be realized by software, hardware, or by executing corresponding software by hardware.
  • the communication device may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to send indication information to the access network device, and the indication information is used to indicate at least one of the following : perform positioning, the type of the communication device, or transmit signaling; and the transceiver unit is further configured to receive an RRC message from the access network device, the RRC message configures SRB2 for the communication device, and does not configure DRB.
  • a ninth aspect provides a communication device capable of implementing the communication method in the second aspect above.
  • the communication device may be a chip or an access network device, and the foregoing method may be implemented by software, hardware, or by executing corresponding software on hardware.
  • the communication device may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to receive indication information from a terminal, and the indication information is used to indicate at least one of the following: perform Positioning, terminal type, or transmission signaling; the transceiver unit is also used to send an RRC message to the terminal, and the RRC message configures SRB2 and unconfigures DRB for the terminal.
  • a communication device which can implement the communication method in the above third aspect.
  • the communication device may be a chip or a terminal.
  • the above method can be realized by software, hardware, or by executing corresponding software by hardware.
  • the communication apparatus may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to receive a second paging message from an access network device, and the second paging message including second indication information, where the second indication information is used to indicate at least one of the following: for positioning or for signaling transmission; and the transceiver unit is further configured to send an RRC message to the access network device, the The RRC message is triggered by the second paging message.
  • a communication device which can implement the communication method in the fourth aspect above.
  • the communication device may be a chip or an access network device, and the foregoing method may be implemented by software, hardware, or by executing corresponding software on hardware.
  • the communication device may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to receive a first paging message from an AMF network element, and the first paging message includes First indication information, the first indication information is used to indicate at least one of the following: for positioning or for signaling transmission; the transceiver unit is further configured to send a second paging message to the terminal according to the first paging message a paging message; and the transceiving unit is further configured to receive an RRC message from the terminal, and the RRC message is triggered by the second paging message.
  • a communication device which can implement the communication method in the fifth aspect above.
  • the communication device may be a chip or a network element with an access management function, and the foregoing method may be implemented by software, hardware, or by executing corresponding software on hardware.
  • the communication apparatus may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to send a first paging message to an access network device, and the first paging message includes First indication information, where the first indication information is used to indicate at least one of the following: for positioning or for signaling transmission; and the transceiver unit is also configured to receive a NAS message from a terminal, the NAS message is sent by the The first paging message triggers.
  • a thirteenth aspect provides a communication device that can implement the communication method in the sixth aspect above.
  • the communication device may be a chip or a terminal.
  • the above method can be realized by software, hardware, or by executing corresponding software by hardware.
  • the communication device may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to send indication information to an AMF network element, and the indication information is used to indicate at least one of the following: Perform positioning, transmit signaling, or terminal type; and the transceiver unit is further configured to receive a NAS message from the AMF network element.
  • a fourteenth aspect provides a communication device that can implement the communication method in the seventh aspect above.
  • the communication device may be a chip or a network element with an access management function, and the foregoing method may be implemented by software, hardware, or by executing corresponding software on hardware.
  • the communication device may include a transceiver unit and a processing unit; wherein: the transceiver unit is configured to receive indication information from a terminal, and the indication information is used to indicate at least one of the following: perform positioning, transmission signaling, or terminal type; the processing unit is used to determine not to establish a session; and the transceiver unit is also used to send a NAS message to the terminal.
  • the communication device in the above eighth aspect to the fourteenth aspect includes a processor coupled to a memory; the processor is configured to support the device to perform corresponding functions in the above communication method.
  • the memory is used to be coupled with the processor, and it holds programs (instructions) and/or data necessary for the device.
  • the communication device may further include a communication interface for supporting communication between the device and other network elements.
  • the memory may be located inside the communication device or outside the communication device.
  • the communication device in the eighth aspect to the fourteenth aspect above includes a processor and a transceiver device, the processor is coupled to the transceiver device, and the processor is configured to execute a computer program or Instructions to control the transceiver device to receive and send information; when the processor executes the computer program or instructions, the processor is also used to implement the above method through logic circuits or code instructions.
  • the transceiver device may be a transceiver, a transceiver circuit or an input-output interface, which is used to receive signals from other communication devices other than the communication device and transmit them to the processor or transmit signals from the processor to other communication devices other than the communication device.
  • the transceiver device is a transceiver circuit or an input-output interface.
  • the sending unit may be an output unit, such as an output circuit or a communication interface; the receiving unit may be an input unit, such as an input circuit or a communication interface.
  • the sending unit may be a transmitter or a transmitter; the receiving unit may be a receiver or a receiver.
  • a computer-readable storage medium is provided, and a computer program or instruction is stored in the computer-readable storage medium, and when the computer program or instruction is executed, the methods described in the above aspects are implemented.
  • a computer program product including instructions is provided, and when the instructions are run on a communication device, the communication device is made to execute the methods described in the above aspects.
  • a communication system includes the communication device of the eighth aspect and the communication device of the ninth aspect.
  • a communication system in an eighteenth aspect, includes the communication device of the tenth aspect, the communication device of the eleventh aspect, and the communication device of the twelfth aspect.
  • a communication system in a nineteenth aspect, includes the communication device of the thirteenth aspect and the communication device of the fourteenth aspect.
  • FIG. 1 is a schematic structural diagram of a communication system applying a communication method according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a long-term evolution positioning protocol stack
  • FIG. 3 is a schematic flowchart of a communication method provided in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an initial access process provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the RRC connection recovery process provided by the embodiment of the present application.
  • FIG. 6 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 8 is a schematic flow diagram of a terminal registering to an AMF provided in an embodiment of the present application.
  • FIG. 9 is a schematic flow diagram of a terminal initiating a control plane service request to an AMF according to an embodiment of the present application.
  • FIG. 10 is a schematic flow diagram of a terminal initiating a service request to an AMF according to an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • the technical solutions of the embodiments of the present application can be applied to various communication systems.
  • long term evolution long term evolution
  • LTE frequency division duplex frequency division duplex, FDD
  • LTE time division duplex time division duplex, TDD
  • 5th generation, 5G fifth generation
  • 5G mobile communication system involved in this application includes a non-standalone (NSA) 5G mobile communication system and a standalone (standalone, SA) 5G mobile communication system.
  • NSA non-standalone
  • SA standalone
  • the technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system.
  • the communication system may also be a public land mobile network (PLMN) network, a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an object Internet of Things (IoT), Internet of Vehicles communication system or other communication systems.
  • PLMN public land mobile network
  • D2D device-to-device
  • M2M machine-to-machine
  • IoT object Internet of Things
  • IoT Internet of Vehicles communication system or other communication systems.
  • Fig. 1 is a schematic structural diagram of a communication system applying the communication method of the embodiment of the present application in a 5G mobile communication system.
  • a terminal and an access network device can communicate through an air interface.
  • the terminal can also communicate with the core network equipment through the access network equipment.
  • the access network equipment includes a next-generation node B (next-generation node B, gNB), and the core network equipment includes an AMF network element and a location management function (location management function, LMF) network element for example.
  • the terminal can be connected to a next-generation node B (next-generation node B, gNB) through a first interface (for example, an NR-Uu interface).
  • the gNB is connected to the AMF network element through a second interface (for example, an NG-C interface).
  • the access network can include one or more gNBs ( Figure 1 uses two gNBs as an example to illustrate).
  • the gNB is a 5G base station that accesses the 5G core network.
  • the AMF network element is used to implement access management and other functions, LMF network elements are used to realize functions such as positioning or positioning assistance.
  • the third interface (for example, NL1 interface) is connected between the AMF network element and the LMF network element.
  • Node (node) in this application can be a communication system
  • the device in the device may be, for example, an access network device, a terminal, or a network element in a core network device.
  • the devices or function nodes included in the communication system in FIG. 1 are described as examples only, and do not limit the embodiment of the present application.
  • the communication system in FIG. 1 may also include other network elements or devices or function nodes that have an interactive relationship with the devices or function nodes shown in the figure, which is not specifically limited here.
  • the terminal in this embodiment of the present application may refer to an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a relay station, a remote station, a remote terminal, a mobile device, a user terminal, a user equipment ( user equipment, UE), terminal, wireless communication equipment, user agent, user device, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, vehicle-mounted device, wearable device, terminal in future 5G network or future evolution
  • the embodiment of the present application does not limit the terminal in the PLMN or the terminal in the future Internet of Vehicles.
  • the terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality terminal, an augmented reality terminal, a wireless terminal in industrial control, or a wireless terminal in unmanned driving , wireless terminals in remote surgery, wireless terminals in smart grids, wireless terminals in transportation security, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • wearable devices can also be referred to as wearable smart devices, which is a general term for intelligently designing daily wear and developing wearable devices by applying wearable technology, such as glasses, Gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.
  • the terminal can also be a terminal in the Internet of Things (Internet of Things, IoT) system.
  • IoT Internet of Things
  • connection so as to realize the intelligent network of man-machine interconnection and object interconnection.
  • the IOT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology.
  • NB narrow band
  • the terminal can also include sensors such as smart printers, train detectors, and gas stations, and its main functions include collecting data (part of the terminal), receiving control information and downlink data of access network equipment, and sending electromagnetic waves , to transmit uplink data to the access network device.
  • sensors such as smart printers, train detectors, and gas stations
  • its main functions include collecting data (part of the terminal), receiving control information and downlink data of access network equipment, and sending electromagnetic waves , to transmit uplink data to the access network device.
  • the access network device in this embodiment of the present application may be any communication device with a wireless transceiver function for communicating with the terminal.
  • the access network equipment includes but is not limited to: an evolved node B (evolved node B, eNB), a baseband unit (baseband unit, BBU), a wireless fidelity (wireless fidelity, WIFI) system access point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission reception point (transmission reception point, TRP), etc.
  • the access network device may also be a gNB, TRP or TP in the 5G system, or one or a group (including multiple antenna panels) antenna panels of the base station in the 5G system.
  • the access network device may also be a network node constituting a gNB or a TP, such as a BBU, or a distributed unit (distributed unit, DU).
  • a gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (active antenna unit, AAU).
  • the CU implements some functions of the gNB
  • the DU implements some functions of the gNB.
  • the CU is responsible for processing non-real-time protocols and services, and realizing the functions of radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP) layer.
  • the DU is responsible for processing physical layer protocols and real-time services, realizing the functions of the radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer (physical layer, PHY).
  • the AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , or, sent by DU and AAU. It can be understood that the access network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the access network device and the terminal in the embodiment of the present application may communicate through the licensed spectrum, the license-free spectrum, or both the licensed spectrum and the license-free spectrum.
  • Communication between the access network device and the terminal may be performed through a frequency spectrum below 6 GHz (gigahertz, GHz), or may be performed through a frequency spectrum above 6 GHz, or may be performed using a frequency spectrum below 6 GHz and a frequency spectrum above 6 GHz at the same time.
  • the embodiments of the present application do not limit the frequency spectrum resources used between the access network device and the terminal.
  • the terminals and access network devices in the embodiments of this application can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on airplanes, balloons and artificial satellites in the air superior.
  • the embodiments of the present application do not limit the application scenarios of the terminal and the access network device.
  • the 5th generation ( 5th generation, 5G) mobile communication terminal When the 5th generation ( 5th generation, 5G) mobile communication terminal initially accesses the network, it will respectively establish signaling connections on the control plane and the data plane with the access network equipment and the core network.
  • the message signaling bearer between the terminal and the access network device is divided into SRB and DRB.
  • the SRB is defined as a control plane data radio bearer used to transmit radio resource control (radio resource control, RRC) messages and non-access stratum (non-access stratum, NAS) messages
  • the DRB is used to transmit user plane data radio bearers.
  • the SRB can be divided into: SRB0, SRB1, SRB2 and SRB3. Specifically:
  • SRB0 is used to transmit RRC messages transmitted using a common control channel (common control channel, CCCH).
  • CCCH common control channel
  • the CCCH is a common control channel, which is used for the terminal and the network to transmit control information when there is no RRC connection.
  • SRB1 is used to transmit RRC messages and NAS messages before SRB2 is established, and these messages are transmitted using a dedicated control channel (DCCH).
  • the DCCH channel is a dedicated control channel, a bidirectional channel used for point-to-point transmission of dedicated control information between a terminal with an RRC connection and the network.
  • SRB2 is used to transmit NAS messages and RRC messages, and these messages are transmitted using the DCCH channel.
  • SRB3 is used to transmit RRC messages during dual link, and these messages are transmitted using the DCCH channel.
  • the positioning service For the positioning service, it involves the signaling interaction between the terminal and the access network device, the terminal and the AMF network element, the terminal and the LMF network element, and the access network device and the LMF.
  • the protocol interface between the terminal and the LMF is the long term evolution positioning protocol (LTE positioning protocol, LPP).
  • LPP long term evolution positioning protocol
  • the LPP message between the terminal and the LMF is carried in the NAS message, and its protocol stack is shown in Figure 2. Therefore, the positioning service requires the terminal to access the network and establish SRB2.
  • the establishment of SRB2 should be accompanied by the establishment of DRB.
  • a terminal performing certain services for example, positioning
  • there is no need for data transmission and the establishment of a DRB will result in a signaling delay and a waste of air interface signaling resources. Therefore, establishing a DRB is meaningless for these terminals and brings time delay, which affects the performance indicators of these services.
  • this embodiment of the present application provides a communication solution.
  • the terminal can make the access network device clearly know that it is not necessary to establish a DRB for the terminal, so that it can decide not to establish a DRB for the terminal. Ensure normal communication.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce terminal processing complexity, reduce communication delay, and reduce the impact on key business performance indicators.
  • FIG. 3 it is a schematic flowchart of a communication method provided in the embodiment of the present application.
  • the method may include the following steps:
  • the terminal sends indication information to the access network device.
  • the terminal sends indication information to the access network device.
  • the indication information is used to indicate at least one of the following: perform positioning, terminal type, or transmit signaling.
  • the indication information may be a direct or indirect indication.
  • the terminal notifies the access network device through the indication information that there is a control signaling transmission requirement between the terminal and the access network device, and there is no data transmission requirement.
  • the indication information is used to indicate at least one of the following: when performing positioning or signaling transmission, the above-mentioned absence of data transmission requirement may mean that the terminal has no data transmission during this access or has never had data transmission.
  • the above-mentioned absence of data transmission requirement may mean that there is no data transmission all the time.
  • the access network device sends an RRC message to the terminal.
  • the access network device After receiving the above instruction information, the access network device determines that the terminal has no subsequent data transmission requirements, and then chooses to configure SRB2 instead of DRB. Therefore, the access network device sends an RRC message to the terminal. Wherein, the RRC message configures SRB2 for the terminal, and does not configure DRB.
  • the method may also include the following steps (indicated by dashed lines in the figure):
  • the terminal sends a Mobile Originated Location Request (Mobile Originated Location Request) message to the AMF through the access network device.
  • a Mobile Originated Location Request Mobile Originated Location Request
  • the terminal can send a mobile positioning location request message to the AMF through the SRB2.
  • the AMF sends a Determine Location Request (Determine Location Request) message to the LMF.
  • the AMF may send a location determination request message to the LMF to request the location of the terminal.
  • the LMF locates the terminal.
  • the LMF sends a determine location response (Determine location response) message to the AMF, where the message includes the location of the terminal.
  • the LMF After locating the terminal, the LMF sends a location determination response message to the AMF to return the location of the terminal to the AMF.
  • the AMF sends a Mobile Originated Location Response (Mobile Originated Location Response) message to the terminal through the access network device, and the message includes the terminal location.
  • a Mobile Originated Location Response Mobile Originated Location Response
  • the AMF After obtaining the location of the terminal, the AMF returns the location to the terminal through a mobile positioning location response message.
  • the AMF may send a location determination request message to the LMF to request the location of the terminal, that is, the above step S303 may not be included.
  • the LMF locates the terminal and sends a location determination response message to the AMF to return the location result to the AMF.
  • step S301 that is, how the terminal sends the indication information
  • step S301 there are multiple implementations as follows:
  • a schematic diagram of the initial access process provided by the embodiment of the present application, the process includes the following steps:
  • the terminal sends an RRC setup request (RRCSetupRequest) message to the access network device.
  • RRC setup request RRCSetupRequest
  • a terminal in a radio resource control-idle state sends an RRC establishment request message to an access network device.
  • RRC-IDLE radio resource control-idle state
  • the RRC establishment request message may include the above indication information.
  • the indication information includes at least one of the following: positioning (positioning), positioning signaling (positioning-signaling), positioning service (location service), or positioning service signaling (location -signaling).
  • the indication information may also be other information capable of instructing positioning, which is not limited in this application.
  • the indication information is an establishment reason, which may be referred to as a first establishment reason here.
  • the indication information is not limited to the reason.
  • the indication information may also be information element, message type, or other information capable of indication.
  • the indication information includes at least one of the following: signaling (signaling), signaling-only, or control signaling (control-signaling) .
  • the indication information may also be other information capable of instructing signaling transmission, which is not limited in this application.
  • the indication information is an establishment reason, which may be referred to as a second establishment reason here.
  • the indication information is not limited to the reason.
  • the indication information may also be information element, message type, or other information capable of indication.
  • the RRC establishment request message may include an establishment cause (establishmentCause) information element (information element, IE).
  • the value of this information element may include any of the above establishment reasons.
  • the access network device sends an RRC establishment message to the terminal.
  • the access network device After receiving the RRC establishment request message, the access network device sends the RRC establishment message to the terminal.
  • the above RRC establishment request message and RRC establishment message are sent by using SRB0.
  • the terminal receives the RRC establishment message sent by the access network device, and establishes SRB1. So far, the terminal enters the RRC connected state (RRC connected).
  • the terminal sends an RRC setup complete (RRCSetupComplete) message to the access network device.
  • RRC setup complete RRCSetupComplete
  • the terminal uses SRB1 to send an RRC establishment complete message to the access network device.
  • This message carries an initial NAS message and is used to establish a NAS connection. Subsequent NAS messages may be sent over SRB1 before SRB2 is established.
  • step S404 may also be performed after step S403.
  • the access network device sends an RRC reconfiguration (RRCReconfiguration) message to the terminal.
  • RRC reconfiguration RRCReconfiguration
  • the access network device After the access network device receives the above indication information of the above RRC establishment request message, or analyzes the establishment reason therein, and determines that the terminal initiates the RRC establishment request without data transmission requirements, it chooses to configure SRB2 instead of DRB.
  • the receiving network device sends an RRC reconfiguration message to the terminal, and the RRC reconfiguration message configures SRB2 and does not configure DRB for the terminal.
  • Step 404 can be regarded as an example of step S302 in the embodiment shown in FIG. 3 .
  • the terminal sends an RRC reconfiguration complete (RRCReconfigurationComplete) message to the access network device.
  • RRC reconfiguration complete RRCReconfigurationComplete
  • the terminal completes the establishment of SRB2, and subsequent NAS messages are sent through SRB2.
  • the access network device may also determine not to configure SRB2 and DRB after receiving the above indication information of the above RRC establishment request message, or analyzing the establishment reason therein. That is, the above RRC reconfiguration message does not configure SRB2 or DRB.
  • the NAS message sent by the terminal to the network for example, the NAS message carrying the LPP message, is sent through SRB1.
  • FIG. 5 is a schematic diagram of an RRC connection recovery process provided by the embodiment of the present application.
  • RRC inactive For a terminal in the RRC inactive state (RRC inactive), enter the connected state by restoring the RRC connection.
  • the method may include the steps of:
  • the terminal sends an RRC resume request (RRC Resume Request) message to the access network device.
  • RRC Resume Request RRC Resume Request
  • the terminal is in the RRC inactive state, and sends an RRC recovery request message to the access network device on SRB0.
  • the RRC recovery request message may include the above indication information.
  • the indication information includes at least one of the following: positioning (positioning), positioning signaling (positioning-signaling), positioning service (location service), or positioning service signaling (location -signaling).
  • the indication information may also be other information capable of instructing positioning, which is not limited in this application.
  • the indication information is the first resume cause (resumeCause).
  • the indication information may also be information element, message type, or other information capable of indication.
  • the indication information includes at least one of the following: signaling (signaling), signaling-only, or control signaling (control-signaling) .
  • the indication information may also be other information capable of instructing signaling transmission, which is not limited in this application.
  • the indication information is the second recovery reason.
  • the indication information may also be information element, message type, or other information capable of indication.
  • the RRC recovery request message may include a resumeCause information element, and the value of the information element includes any of the above-mentioned recovery reasons.
  • the access network device sends an RRC resume (RRC Resume) message to the terminal.
  • RRC resume RRC Resume
  • the access network device After receiving the RRC recovery request message, the access network device recovers the SRB1 of the terminal, and sends an RRC recovery message to the terminal through SRB1.
  • the terminal sends an RRC resume complete (RRC Resume Complete) message to the access network device.
  • RRC Resume Complete RRC Resume Complete
  • the terminal After receiving the above RRC recovery message, the terminal enters the connection state, and sends an RRC recovery completion message to the access network device.
  • step S504 may also be performed after step S503.
  • the access network device sends an RRC reconfiguration (RRCReconfiguration) message to the terminal.
  • RRC reconfiguration RRCReconfiguration
  • the access network device receives the above indication information of the above RRC recovery request message, or, after analyzing the recovery reason, determines that the terminal initiates the RRC recovery request without data transmission requirements, then chooses to recover or configure SRB2, and does not recover or configure DRB .
  • the access network device sends an RRC reconfiguration message to the terminal, and the RRC reconfiguration message restores or establishes SRB2 for the terminal, and the DRB is not restored or configured.
  • the access network device does not restore or configure DRB may be: the access network device does not restore or does not establish a DRB for the terminal; or, the access network device has originally established a DRB for the terminal, then after receiving After completing the message, release the DRB through the RRC reconfiguration message.
  • the terminal After receiving the RRC reconfiguration message, the terminal recovers or establishes SRB2.
  • Step S504 can be regarded as an example of step S302 in the embodiment shown in FIG. 3 .
  • the terminal sends an RRC reconfiguration complete (RRCReconfigurationComplete) message to the access network device.
  • RRC reconfiguration complete RRCReconfigurationComplete
  • the terminal completes recovery or establishes SRB2, and subsequent NAS messages are sent through SRB2.
  • the access network device may also determine not to restore or configure SRB2 and DRB after receiving the above indication information of the above RRC recovery request message, or analyzing the recovery reason therein. That is, the above RRC reconfiguration message is not restored or SRB2 and DRB are not configured. Or, when the access network device has already established SRB2 and/or DRB for the terminal, the RRC reconfiguration message releases SRB2 and/or DRB.
  • the NAS message sent by the terminal to the network for example, the NAS message carrying the LPP message, is sent through SRB1.
  • the difference from the above implementation is that the RRC establishment request message remains unchanged, that is, the RRC establishment request message does not include the above indication information.
  • the indication information is included in the RRC establishment complete message. For information indicated by the indication information, reference may be made to the description of the foregoing implementation manners.
  • the access network device After receiving the above indication information of the above RRC establishment complete message, the access network device determines that the initial access does not include data transmission requirements, and may choose to configure SRB2 for the terminal instead of DRB.
  • the receiving network device sends an RRC reconfiguration message to the terminal, and the RRC reconfiguration message configures SRB2 and does not configure DRB for the terminal.
  • the terminal After receiving the RRC reconfiguration message, the terminal establishes SRB2. So far, the terminal completes the establishment of SRB2, and subsequent NAS messages are sent through SRB2.
  • the access network device may also determine not to configure SRB2 and not to configure DRB after receiving the above indication information of the above RRC establishment complete message. That is, the above RRC reconfiguration message does not configure SRB2 or DRB.
  • the NAS message sent by the terminal to the network for example, the NAS message carrying the LPP message, is sent through SRB1.
  • the indication information is included in the RRC establishment request message or the RRC establishment complete message.
  • the indication information includes at least one of the following: a positioned node indication (pos-NodeIndication), or a positioning indication (pos-Indication).
  • the indication information may also be other information that can indicate that the terminal type is a positioned terminal, which is not limited in this application.
  • the indication information includes at least one of the following: a signaling node indication, or a signaling-only node indication (signalingOnly-NodeIndication).
  • the indication information may also be other information that can indicate that the type of the terminal is a terminal that transmits signaling, which is not limited in this application.
  • the indication information may be used to indicate other terminal types, and the indication information may be, for example, a reduced capability (reduced capability, redcap) node, a reduced capability positioning node, a low power high accuracy positioning (low power high accuracy positioning) , LPHAP) node, which is not limited in this application.
  • a node here can be understood as a terminal.
  • the access network device After receiving the above-mentioned indication information of the RRC establishment request message or the RRC establishment complete message, the access network device determines that the initial access does not include data transmission requirements, and may choose to configure SRB2 for the terminal instead of DRB.
  • the receiving network device sends an RRC reconfiguration message to the terminal, and the RRC reconfiguration message configures SRB2 and does not configure DRB for the terminal.
  • the terminal After receiving the RRC reconfiguration message, the terminal establishes SRB2. So far, the terminal completes the establishment of SRB2, and subsequent NAS messages are sent through SRB2.
  • the access network device may determine not to configure SRB2 and not to configure DRB after receiving the indication information of the above-mentioned terminal type in the above-mentioned RRC establishment request message or RRC establishment complete message. That is, the above RRC reconfiguration message does not configure SRB2 or DRB.
  • the NAS message sent by the terminal to the network for example, the NAS message carrying the LPP message, is sent through SRB1.
  • the difference from the above implementation is that the RRC recovery request message remains unchanged, that is, the RRC recovery request message does not include the above indication information.
  • the indication information is included in the RRC recovery completion message. For the content indicated by the indication information, reference may be made to the above description.
  • the access network device After receiving the above indication information of the RRC recovery complete message, the access network device determines that there is no data transmission requirement for the terminal to initiate the RRC recovery, and then chooses to recover or configure SRB2, and not to recover or configure DRB. The access network device sends an RRC reconfiguration message to the terminal, and the RRC reconfiguration message restores or establishes SRB2 for the terminal, and the DRB is not restored or configured.
  • the access network device does not restore or configure DRB may be: the access network device does not restore or does not establish a DRB for the terminal; After completing the message, release the DRB through the RRC reconfiguration message.
  • the terminal After receiving the RRC reconfiguration message, the terminal recovers or establishes SRB2. So far, the terminal completes recovery or establishes SRB2, and subsequent NAS messages are sent through SRB2.
  • the access network device may also determine not to restore or configure SRB2 and DRB after receiving the above indication information of the above RRC recovery complete message. That is, in the RRC reconfiguration message, SRB2 and DRB are not restored or configured. Or, when the access network device has already established SRB2 and/or DRB for the terminal, the access network device releases SRB2 and/or DRB for the terminal through the RRC reconfiguration message.
  • the NAS message sent by the terminal to the network for example, the NAS message carrying the LPP message, is sent through SRB1.
  • the terminal can make the access network device clearly know that there is no need to establish a DRB for the terminal by sending the indication information, so as to decide not to establish a DRB for the terminal, which can ensure normal communication.
  • This method is especially suitable for positioning scenarios, which can save air interface resources, reduce the processing complexity of terminals, reduce communication delays, and reduce the impact on key business performance indicators (for example, for positioning or positioning terminals that are dedicated to positioning
  • the access network device chooses to establish SRB2 for the terminal instead of configuring DRB, which can reduce the communication delay and reduce the impact on the performance index of the positioning service).
  • the terminal when the terminal initiates access or initiates connection recovery, the terminal is indicated by indication information that there is no data transmission requirement currently.
  • the terminal access is triggered by the network.
  • FIG. 6 it is a schematic flowchart of another communication method provided in the embodiment of the present application.
  • the method may include the following steps:
  • the AMF sends a first paging (paging) message to the access network device.
  • the terminal is in an idle state, and the network triggers the terminal to access the network.
  • the AMF sends the first paging message to the access network device.
  • the access network device receives the first paging message.
  • the first paging message includes first indication information, and the first indication information is used to indicate at least one of the following: for positioning or for signaling transmission. That is, the network triggers the terminal to access the network for positioning or signaling transmission.
  • the first paging message may include at least one of the following information elements: paging for positioning, paging for signaling, and paging for signaling only (paging for signaling only), or paging purpose (paging purpose), where the value of paging purpose can be: positioning (pos/positioning), or signaling (signaling), etc.
  • the first paging message may include other information elements that can indicate that paging is performed for positioning or signaling transmission, which is not limited here.
  • the Assistance Data for Paging information element in the paging message may include the paging for positioning information element.
  • the access network device After receiving the first paging message, the access network device sends the second paging message to the terminal.
  • the access network device After receiving the first paging message, the access network device determines that the AMF sends the first paging message to perform paging for positioning/or signaling transmission, and/or to paging the terminal for signaling transmission. Therefore, the access network device sends the second paging message. Specifically, after receiving the first paging message, the access network device parses the first paging message, obtains indication information therein, and generates a second paging message.
  • the second paging message includes second indication information, and the second indication information is used to indicate at least one of the following: for positioning or for signaling transmission.
  • the content of the second indication information may be the same as that of the above-mentioned first indication information.
  • the second paging message may include other information elements that can indicate that paging is performed for positioning or signaling transmission, which is not limited here.
  • the information element: paging purpose may be included in the second paging message, and its value is: pos/positioning/signaling, etc., indicating that the value may be pos, positioning, or signaling.
  • the terminal sends an RRC message to the access network device.
  • the terminal may know that the network paging triggers its access to the network to perform paging for positioning/or signaling transmission, and/or paging the terminal for signaling transmission.
  • the terminal may know that the network paging triggers its access to the network to perform paging for positioning/or signaling transmission, and/or paging the terminal for signaling transmission.
  • the terminal sends an RRC establishment request message to the access network device in the subsequent process of initiating access, and the message is triggered by the above-mentioned second paging message.
  • the RRC establishment request message includes indication information, indicating at least one of the following: perform positioning, terminal type, or transmit signaling, then the access network device chooses to configure SRB2 for the terminal, not to configure DRB for the terminal, or not to configure the DRB for the terminal.
  • the terminal is configured with SRB2 and DRB.
  • the indication information may be an establishment reason, an information element, or an indication, and the like.
  • the indication information is included in the RRC establishment complete message. For details, refer to the methods shown in FIG. 3 and FIG. 4 , and details are not repeated here.
  • the terminal does not perform additional processing, that is, the RRC establishment request message and the RRC establishment complete message do not include the above indication information, and the access network device determines that SRB2 is configured for the terminal, and DRB is not configured for the terminal. Therefore, the terminal sends an RRC establishment request message to the access network device, and the message is triggered by the above-mentioned second paging message.
  • the access network device determines not to establish a DRB for the terminal according to the first indication information, or does not configure SRB2 and DRB for the terminal.
  • the access network device sends an RRC setup message to the terminal.
  • the terminal sends an RRC establishment complete message to the access network device.
  • the RRC establishment complete message includes the NAS message.
  • the foregoing second paging message may not include the second indication information.
  • the terminal sends an RRC recovery request message to the access network device, and the message is triggered by the above-mentioned second paging message.
  • the RRC recovery request message includes indication information, indicating at least one of the following: for positioning, terminal type, or transmission signaling, the network chooses to recover or configure SRB2 for the terminal, and not recover or configure DRB for the terminal, or not for the terminal.
  • the terminal recovers or configures SRB2 and DRB.
  • the indication information may be an establishment reason, an information element, or an indication, and the like.
  • the indication information is included in the RRC recovery completion message. For details, refer to the methods shown in FIG. 3 and FIG. 5 , and details are not repeated here.
  • the terminal does not perform additional processing, that is, the RRC recovery request message and the RRC recovery complete message do not include the above indication information, and the network determines to restore or configure SRB2 for the terminal, and not restore or configure DRB for the terminal. Therefore, the terminal sends an RRC recovery request message to the access network device, and the message is triggered by the above-mentioned second paging message.
  • the access network device determines not to recover or establish DRB for the terminal, or not to recover or configure SRB2 and DRB for the terminal according to the first indication information.
  • the access network device sends an RRC recovery message to the terminal.
  • the terminal sends an RRC recovery complete message to the access network device.
  • the NAS message is included in the RRC recovery complete message.
  • the foregoing second paging message may not include the second indication information.
  • the access network device After the access network device receives the RRC message from the terminal, the access network device forwards the NAS message included in the RRC message to the AMF.
  • the NAS message is triggered by the above-mentioned first paging message.
  • the access network device receives the RRC establishment complete message sent by the terminal.
  • the RRC establishment complete message includes the NAS message.
  • the access network device obtains the NAS message in the RRC establishment complete message, and forwards the NAS message to the AMF.
  • the AMF receives the NAS message.
  • the access network device receives the RRC recovery completion message sent by the terminal.
  • the NAS message is included in the RRC recovery completion message.
  • the access network device acquires the NAS message in the RRC recovery completion message, and forwards the NAS message to the AMF.
  • the AMF receives the NAS message.
  • the NAS message may be a service request (service request) message or a control plane service request (control plane service request) message.
  • the AMF determines that the terminal is accessed, and then may send a Determine Location Request (Determine Location Request) message to the LMF to request the location of the UE.
  • the LMF locates the terminal and returns the location result to the AMF through a Determine Location Response message.
  • the network when the network triggers terminal access, it can indicate in the paging message that paging is performed for positioning and/or paging for signaling transmission.
  • Configuring DRB can ensure normal communication. This method is especially suitable for positioning scenarios, which can save air interface resources, reduce terminal processing complexity, reduce communication delay, and reduce the impact on key business performance indicators.
  • the AMF will establish a packet data unit (PDU) session for the initial access terminal.
  • PDU packet data unit
  • FIG. 7 it is a schematic flowchart of another communication method provided in the embodiment of the present application.
  • the method may include the following steps:
  • the terminal sends indication information to the AMF.
  • the terminal sends indication information to the AMF.
  • the indication information is used to indicate at least one of the following: perform positioning, transmit signaling, or terminal type.
  • the indication information is carried in the NAS message.
  • the indication information includes at least one of the following: registration for positioning, positioning, or positioning service.
  • the indication information may also be other information capable of instructing positioning, which is not limited in this application.
  • the indication information includes at least one of the following: registration for signaling for transmission of control signaling, transmission of control signaling only (signaling only), control signaling only signaling, signaling only, or signaling service.
  • the indication information may also be other information capable of indicating transmission signaling, which is not limited in this application.
  • the indication information when used to indicate that the terminal type is a positioned terminal, the indication information includes at least one of the following: a positioned node indication (pos-NodeIndication), or a positioning indication (pos-Indication).
  • the indication information may also be other information that can indicate that the terminal type is a positioned terminal, which is not limited in this application.
  • a node here can be understood as a terminal.
  • the indication information When the indication information is used to indicate that the type of the terminal is a signaling-transmitting terminal, the indication information includes at least one of the following: a signaling node indication, or a signaling-only node indication (signalingOnly-NodeIndication).
  • the indication information may also be other information that can indicate that the type of the terminal is a terminal that transmits signaling, which is not limited in this application.
  • a node here can be understood as a terminal.
  • the indication information can be used to indicate other terminal types, and the indication information can be, for example, a reduced capability (reduced capability, redcap) node, a reduced capability positioning node, a low power high accuracy positioning (low power high accuracy positioning, LPHAP ) node, which is not limited in this application.
  • the above indication information may also be information element, message type, or other information capable of indication.
  • the AMF determines not to establish a session.
  • the AMF acquires the indication information, determines whether the terminal accesses the network for positioning or signaling transmission, or determines the type of the terminal, and the AMF determines not to establish a PDU session according to the indication information. Not establishing a PDU session can save signaling overhead and reduce delay without affecting key service performance indicators.
  • the AMF sends the NAS message to the terminal through the access network device.
  • the NAS message is used to respond to the NAS message carrying the above indication information.
  • the NAS message may be a registration accepted (registration accepted) message.
  • the NAS message may be a control plane service acceptance (Service Accept) message.
  • the NAS message may be a service acceptance message.
  • FIG. 8 a schematic flow diagram of terminal registration to AMF, the flow includes the following steps:
  • the terminal sends a registration request (registration request) message to the AMF.
  • the registration request message may include the above indication information.
  • the indication information reference may be made to the description in the above step S701.
  • the indication information when the indication information is used to indicate registration for positioning, the indication information may specifically be the first registration type. Alternatively, the indication information may be used to indicate positioning.
  • the indication information when the indication information is used to register for signaling transmission, the indication information may specifically be the second registration type. Alternatively, the indication information may be used to indicate only transmission of control signaling, only control signaling, or only signaling.
  • the indication information may be a positioning node, a signaling node, an LPHAP terminal, a redcap positioning terminal, and the like.
  • first registration type or second registration type may be included in a 5G system registration type (5GS registration type) information element in the registration request message.
  • 5GS registration type 5G system registration type
  • the value of the 5G system registration type IE is illustrated in Table 1 below:
  • the value of the 5G system registration type can be located in the first bit to the third bit of the first byte (octet1) of the 5G system registration type information element.
  • "Bits 321" is used to indicate the bit sequence from the first bit to the third bit of the byte.
  • the AMF determines not to establish a session.
  • the AMF receives the registration request message, acquires indication information, and determines not to establish a session. For example, when the indication information indicates positioning or signaling transmission, or the terminal type indicated by the indication information is a positioning terminal, or a signaling transmission terminal, or other terminals without signaling transmission, such as an LPHAP terminal, When redcap locates the terminal, etc., it is determined not to establish a session.
  • the AMF sends a registration accepted (registration accepted) message to the terminal.
  • the registration acceptance message is used to inform the terminal that the registration is accepted.
  • a schematic flow diagram of the terminal initiating a control plane service request to the AMF may include the following steps:
  • the terminal sends a control plane service request (Control Plane Service Request) message to the AMF.
  • control plane service request Control Plane Service Request
  • the control plane service request message may include the above indication information.
  • the indication information reference may be made to the description in the above step S701.
  • the indication information when the indication information is used to indicate a positioning service, the indication information may specifically be the first control plane service type. Alternatively, the indication information may be used to indicate positioning.
  • the indication information when the indication information is used to indicate a signaling service, the indication information may specifically be the second control plane service type. Alternatively, the indication information may be used to indicate only transmission of control signaling, only control signaling, or only signaling.
  • the indication information may be a positioning node, a signaling node, an LPHAP terminal, a redcap positioning terminal, and the like.
  • the first control plane service type or the second control plane service type may be included in a control plane service type (control plane service type) information element in the control plane service request message.
  • Table 2 below illustrates the value of the service type IE on the control plane:
  • the value of the service type of the control plane may be located in the first bit to the third bit of the first byte (octet1) of the information element of the service type of the control plane.
  • "Bits 321" is used to indicate the bit sequence from the first bit to the third bit of the byte.
  • control plane service type when the value of the control plane service type is "111", it indicates that the control plane service type is a positioning service. Certainly, more control plane service type values may be added to indicate that the control plane service type is a positioning service or a signaling service.
  • the AMF determines not to establish a session.
  • the AMF receives the control plane service request message, acquires indication information, and determines not to establish a session. For example, when the indication information indicates positioning or signaling transmission, or the terminal type indicated by the indication information is a positioning terminal, or a signaling transmission terminal, or other terminals without signaling transmission, such as an LPHAP terminal, When redcap locates the terminal, etc., it is determined not to establish a session.
  • the AMF sends a control plane service acceptance (Service Accept) message to the terminal.
  • the control plane service acceptance message is used to inform the terminal that the control plane service is accepted.
  • a schematic flow diagram of a terminal initiating a service request to an AMF the flow may include the following steps:
  • the terminal sends a service request (Service Request) message to the AMF.
  • Service Request Service Request
  • the service request message may include the above indication information.
  • the indication information reference may be made to the description in the above step S701.
  • the indication information when the indication information is used to indicate a positioning service, the indication information may specifically be the first service type. Alternatively, the indication information may be used to indicate positioning.
  • the indication information when the indication information is used to indicate a signaling service, the indication information may specifically be the second service type. Alternatively, the indication information may be used to indicate only transmission of control signaling, only control signaling, or only signaling.
  • the indication information may be a positioning node, a signaling node, an LPHAP terminal, a redcap positioning terminal, and the like.
  • first service type or second service type may be included in a service type (service type) information element in the service request message.
  • the value of the service type may be located in the first bit to the fourth bit of the first byte (octet1) of the service type information element.
  • “Bits 4321" is used to indicate the bit sequence from the first bit to the fourth bit of the byte.
  • the AMF determines not to establish a session.
  • the AMF receives the service request message, acquires indication information, and determines not to establish a session. For example, when the indication information indicates positioning or signaling transmission, or the terminal type indicated by the indication information is a positioning terminal, or a signaling transmission terminal, or other terminals without signaling transmission, such as an LPHAP terminal, When redcap locates the terminal, etc., it is determined not to establish a session.
  • the AMF sends a service acceptance message to the terminal.
  • the service acceptance message is used to inform the terminal that the service is accepted.
  • the terminal after the terminal accesses the network, it can notify the AMF that the purpose of this access is not to transmit service data, so that the AMF decides not to establish a session for the terminal, thereby ensuring normal communication.
  • This method is especially suitable for positioning scenarios, which can save signaling resources, reduce communication delay, and reduce the impact on key performance indicators.
  • FIG. 11 it is a schematic flowchart of another communication method provided by the embodiment of the present application, which is applied to a paging scenario.
  • the method may include the steps of:
  • the AMF sends a third paging message to the access network device.
  • the access network device After receiving the third paging message, the access network device sends the fourth paging message to the terminal.
  • the terminal sends an RRC message to the access network device, where the RRC message is triggered by the fourth paging message.
  • the terminal After receiving the fourth paging message, the terminal sends an RRC establishment request message/RRC recovery request message, which is triggered by the fourth paging message. After receiving the RRC establishment request message from the terminal, the access network device sends an RRC establishment message/RRC recovery message to the terminal. The terminal sends an RRC establishment complete message/RRC recovery complete message, and the RRC establishment complete message/RRC recovery complete message includes a NAS message.
  • the NAS message may be a service request message or a control plane service request message.
  • the NAS message is a first service request message, and the first service request message is the same as the service request message in the above step S1001; or the NAS message is a first control plane service request message, and the first control plane The service request message is the same as the control plane service request message in step S901 above.
  • the terminal determines that the NAS message is the second control plane service request message. After receiving the NAS message, the AMF may determine not to establish a session.
  • Another implementation is that, after receiving the fourth paging message, the terminal determines that the NAS message is the second service request message. After receiving the NAS message, the AMF may determine not to establish a session.
  • the access network device receives the RRC message, the RRC message includes the NAS message, and the access network device forwards the NAS message sent by the terminal to the AMF.
  • the access network device obtains the NAS message in the RRC establishment completion message, and forwards the NAS message.
  • the AMF receives the NAS message.
  • the AMF receives the NAS message and determines not to establish a session.
  • the service request message is the same as the service request message in the above step S1001, and the processing of the AMF is the same as the above step S1002; if the NAS message is the first control plane service request message, the control plane service The request message is the same as the control plane service request message in the above step S901, and the processing of the AMF is the same as the above step S902.
  • the AMF receives the NAS message and determines not to establish a session.
  • the AMF receives the NAS message and determines not to establish a session.
  • the network paging the terminal, the network indicates that the purpose of this paging is not to transmit service data, so that the AMF decides not to establish a session for the terminal, thereby ensuring normal communication.
  • This method is especially suitable for positioning scenarios, saves signaling resources, reduces communication delay, and reduces the impact on key performance indicators.
  • the terminal, the access network device, and the network element with the access management function include hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software with reference to the units and method steps of the examples described in the embodiments disclosed in the present application. Whether a certain function is executed by hardware or computer software drives the hardware depends on the specific application scenario and design constraints of the technical solution.
  • FIG. 12 and FIG. 13 are schematic structural diagrams of a possible communication device provided by an embodiment of the present application. These communication devices can be used to realize the functions of the terminal, the access network device, and the network element with access management function in the above method embodiments, and thus can also realize the beneficial effects of the above method embodiments.
  • the communication device may be a terminal, an access network device or a network element with access management function, or a module (such as a chip) applied to a terminal, an access network device or a network element with access management function. ).
  • a communication device 1200 includes a processing unit 1210 and a transceiver unit 1220 .
  • the communication device 1200 is configured to implement functions of a terminal, an access network device, or a network element with an access management function in the method embodiments shown in FIGS. 3 to 11 above.
  • the transceiver unit 1220 is used to perform the function sent in step S301 in the embodiment shown in FIG. 3, that is, to send an instruction to the access network device information, the indication information is used to indicate at least one of the following: perform positioning, the type of the communication device, or transmit signaling; and the transceiver unit 1220 is also used to perform the receiving
  • the function is to receive an RRC message from the access network device, the RRC message configures SRB2 for the communication device, and does not configure DRB.
  • the transceiver unit 1220 is used to perform the function received in step S301 in the embodiment shown in FIG. indication information, the indication information is used to indicate at least one of the following: positioning, terminal type, or transmission signaling; the transceiver unit 1220 is also configured to execute the function sent in step S302 in the embodiment shown in FIG. 3 , That is, an RRC message is sent to the terminal, and the RRC message configures SRB2 and does not configure DRB for the terminal.
  • the indication information when used to indicate positioning, includes at least one of the following: positioning, positioning signaling, positioning service, or positioning service signaling.
  • the at least one piece of indication information can be used to clearly indicate positioning, which improves the processing efficiency of the access network equipment.
  • the indication information when the indication information is used to indicate that the type of the terminal is a positioned terminal, the indication information includes at least one of the following: a positioned node indication, or a positioning indication.
  • the type of the terminal can be explicitly indicated as a positioned terminal, so that the access network device can decide that there is no need to establish a DRB for the terminal.
  • the indication information when the indication information is used to indicate that the terminal type is a terminal that transmits signaling, the indication information includes at least one of the following: signaling node indication, or only Signaling node indication.
  • the type of the terminal can be clearly indicated as a terminal for transmitting signaling, so that the access network device can decide that it is not necessary to establish a DRB for the terminal.
  • the indication information when used to indicate transmission of signaling, includes at least one of the following: signaling, signaling only, or control signaling.
  • at least one piece of indication information can be used to clearly indicate signaling transmission, which improves the processing efficiency of the access network equipment.
  • the indication information is included in the RRC establishment request message, and the indication information is an establishment reason; or the indication information is included in the RRC recovery request message, and the indication information is a recovery reason; Or the indication information is included in the RRC establishment completion message; or the indication information is included in the RRC recovery completion message.
  • carrying the indication information in any of the above messages can clearly indicate signaling transmission, which improves the processing efficiency of the access network device; and there is no need to send the indication information separately, saving signaling overhead.
  • processing unit 1210 and the transceiver unit 1220 can be directly obtained by referring to related descriptions in the method embodiment shown in FIG. 3 , and details are not repeated here.
  • the transceiver unit 1220 is used to perform the function received in step S602 in the embodiment shown in FIG. Two paging messages, the second paging message includes second indication information, and the second indication information is used to indicate at least one of the following: for positioning or for signaling transmission; and the transceiver unit 1220 is also used to Execute the function sent in step S603 in the embodiment shown in FIG. 6 , that is, send an RRC message to the access network device, and the RRC message is triggered by the second paging message.
  • the transceiver unit 1220 is used to perform the function received in step S601 in the embodiment shown in FIG.
  • the first paging message, the first paging message includes first indication information, and the first indication information is used to indicate at least one of the following: for positioning or for signaling transmission;
  • the transceiver unit 1220 also uses Execute the function sent in step S602 in the embodiment shown in FIG. 6 , that is, send a second paging message to the terminal according to the first paging message; and the transceiver unit 1220 is also used to perform the implementation shown in FIG. 6
  • the function of receiving in step S603 is to receive an RRC message from the terminal, and the RRC message is triggered by the second paging message.
  • the transceiver unit 1220 is used to execute the function sent in step S601 in the embodiment shown in FIG.
  • the network device sends a first paging message, the first paging message includes first indication information, and the first indication information is used to indicate at least one of the following: for positioning or for signaling transmission; and the transceiver unit 1220 is also used to execute the function received in step S604 in the embodiment shown in FIG. 6 , that is, to receive a NAS message from an access network device, where the NAS message is triggered by the first paging message.
  • processing unit 1210 and the transceiver unit 1220 can be directly obtained by referring to the relevant descriptions in the method embodiment shown in FIG. 6 , and details are not repeated here.
  • the transceiver unit 1220 is used to perform the function sent in step S701 in the embodiment shown in FIG. 7, that is, to send instruction information to the AMF network element,
  • the indication information is used to indicate at least one of the following: perform positioning, transmit signaling, or terminal type; and the transceiver unit 1220 is also used to perform the function received in step S703 in the embodiment shown in FIG. NAS messages of AMF network elements.
  • the transceiver unit 1220 is used to perform the function received in step S701 in the embodiment shown in FIG. indication information, the indication information is used to indicate at least one of the following: perform positioning, transmit signaling, or terminal type; the processing unit 1210 is configured to perform the function of step S702 in the embodiment shown in FIG. establishing a session; and the transceiving unit 1220 is also configured to execute the function sent in step S703 in the embodiment shown in FIG. 7 , that is, send a NAS message to the terminal.
  • the indication information when used to indicate positioning, includes at least one of the following: registration for positioning, positioning, or positioning services.
  • the at least one piece of indication information can be used to clearly indicate positioning, which improves the processing efficiency of the AMF.
  • the indication information is included in the registration request message, and the indication information is the first registration type; or the indication information is included in the control plane service request message, and the indication information is the first registration type.
  • a control plane service type; or the indication information is included in the service request message, and the indication information is the first service type.
  • the AMF receives the registration request message/control plane service request message/service request message, and obtains the value of the 5G system registration type in it, when the registration type/control plane service type/service type is registered for positioning or On access, it can be explicitly determined that no session is established. Therefore, signaling resources can be saved and communication delay can be reduced.
  • the indication information when used to indicate the transmission of signaling, includes at least one of the following: register for transmission of control signaling, only transmit control signaling, only Control signaling, signaling only, or signaling traffic.
  • at least one piece of indication information can be used to clearly indicate signaling transmission, which improves the processing efficiency of the AMF.
  • the indication information is included in the registration request message, and the indication information is the second registration type; or the indication information is included in the control plane service request message, and the indication information is the second registration type.
  • the AMF receives the registration request message/control plane service request message/service request message, obtains the 5G system registration type value/control plane service type value/service type value, and when the registration type/control plane The plane service type/service type is determined not to establish a session when registering or accessing for transmission of control signaling. Therefore, signaling resources can be saved and communication delay can be reduced.
  • processing unit 1210 and the transceiver unit 1220 can be directly obtained by referring to the relevant descriptions in the method embodiment shown in FIG. 7 , and details are not repeated here.
  • a communication device 1300 includes a processor 1310 and an interface circuit 1320 .
  • the processor 1310 and the interface circuit 1320 are coupled to each other.
  • the interface circuit 1320 may be a transceiver or an input/output interface.
  • the communication device 1300 may further include a memory 1330 for storing instructions executed by the processor 1310 or storing input data required by the processor 1310 to execute the instructions or storing data generated by the processor 1310 after executing the instructions.
  • the processor 1310 is used to implement the functions of the above-mentioned processing unit 1210
  • the interface circuit 1320 is used to implement the functions of the above-mentioned transceiver unit 1220 .
  • the terminal chip implements the functions of the terminal in the above method embodiment.
  • the terminal chip receives information from other modules in the terminal (such as radio frequency modules or antennas), and the information is sent to the terminal by the access network equipment; or, the terminal chip sends information to other modules in the terminal (such as radio frequency modules or antennas) Information, which is sent by the terminal to the access network device.
  • the access network equipment chip implements the functions of the access network equipment in the above method embodiments.
  • the access network device chip receives information from other modules (such as radio frequency modules or antennas) in the access network device, and the information is sent by the terminal to the access network device; or, the access network device chip sends information to the access network device Other modules (such as radio frequency modules or antennas) in the network send information, and the information is sent by the access network equipment to the terminal.
  • the processor in the embodiments of the present application can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor can be a microprocessor, or any conventional processor.
  • the method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only Memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
  • the storage medium may also be a component of the processor.
  • the processor and storage medium can be located in the ASIC.
  • the ASIC may be located in an access network device or a terminal.
  • the processor and the storage medium may also exist in the access network device or the terminal as discrete components.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, an access network device, a user device or other programmable devices.
  • the computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media.
  • the available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; and it may also be a semiconductor medium, such as a solid state disk.
  • “at least one” means one or more, and “multiple” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the contextual objects are an “or” relationship; in the formulas of this application, the character “/” indicates that the contextual objects are a "division” Relationship.

Abstract

本申请公开了通信方法及装置。该方法包括：终端向接入网设备发送指示信息，该指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；及终端接收来自接入网设备的RRC消息，该RRC消息为终端配置SRB2，以及未配置DRB。如指示信息用于指示进行定位，指示信息包括定位、定位信令、定位业务、或定位业务信令等。如指示信息用于指示终端类型为定位的终端，指示信息包括定位的节点指示、或定位指示。如指示信息用于指示所述终端类型为传输信令的终端，指示信息包括：信令的节点指示、或仅有信令的节点指示。如指示信息用于指示传输信令，指示信息包括以下至少一项：信令、仅有信令、或控制信令。本申请的方案，可以保障正常通信。

Description

通信方法及装置
本申请要求于2021年08月30日提交中国国家知识产权局、申请号为202111008458.8、发明名称为“通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
现有通信系统中，信令无线承载(signalling radio bearer，SRB)2用来传输非接入层(non-access stratum，NAS)消息。SRB2的建立伴随着数据无线承载(data radio bearer，DRB)一起建立。在某些情况下，这可能会影响通信的正常进行。
发明内容
本申请提供一种通信方法及装置，以期保障正常通信。
第一方面，提供了一种通信方法，所述方法包括：终端向接入网设备发送指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；以及所述终端接收来自所述接入网设备的无线资源控制(radio resource control，RRC)消息，所述RRC消息为所述终端配置SRB2，以及未配置DRB。在该方面中，终端通过发送指示信息，可以使得接入网设备明确地获知无需为该终端建立DRB，从而决策不为该终端建立DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少终端的处理复杂度，减少通信时延，降低对关键业务性能指标的影响。
第二方面，提供了一种通信方法，所述方法包括：接入网设备接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；所述接入网设备向所述终端发送RRC消息，所述RRC消息为终端配置SRB2，以及未配置DRB。在该方面中，通过接收终端发送的指示信息，接入网设备可以明确地获知无需为该终端建立DRB，从而决策不为该终端建立DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少通信时延，降低对关键业务性能指标的影响。
结合第一方面或第二方面，在一种可能的实现中，在所述指示信息用于指示进行定位的情况下，所述指示信息包括以下至少一项：定位、定位信令、定位业务、或定位业务信令。在该实现中，通过上述至少一项指示信息，可以明确地指示进行定位，提高了接入网设备的处理效率。
结合第一方面或第二方面，在又一种可能的实现中，在所述指示信息用于指示所述终端类型为定位的终端的情况下，所述指示信息包括以下至少一项：定位的节点指示、或定位指示。在该实现中，根据上述指示信息，可以明确地指示该终端类型为定位的终端，从而接入网设备可以决策无需为该终端建立DRB。
结合第一方面或第二方面，在又一种可能的实现中，在所述指示信息用于指示所述终端类型为传输信令的终端的情况下，所述指示信息包括以下至少一项：信令的节点指示、或仅有信令的节点指示。在该实现中，根据上述指示信息，可以明确地指示该终端类型为传输信令的终端，从而接入网设备可以决策无需为该终端建立DRB。
结合第一方面或第二方面，在又一种可能的实现中，在所述指示信息用于指示传输信令 的情况下，所述指示信息包括以下至少一项：信令、仅有信令、或控制信令。在该实现中，通过上述至少一项指示信息，可以明确地指示进行信令传输，提高了接入网设备的处理效率。
结合第一方面或第二方面，在又一种可能的实现中，所述指示信息包括在RRC建立请求消息中，所述指示信息为建立原因；或所述指示信息包括在RRC恢复请求消息中，所述指示信息为恢复原因；或所述指示信息包括在RRC建立完成消息中；或所述指示信息包括在RRC恢复完成消息中。在该实现中，在上述任一消息中携带指示信息，可以明确地指示进行信令传输，提高了接入网设备的处理效率；且无需单独发送该指示信息，节省了信令开销。
第三方面，提供了一种通信方法，所述方法包括：终端接收来自接入网设备的第二寻呼消息，所述第二寻呼消息包括第二指示信息，所述第二指示信息用于指示以下至少一项：为了定位、或为了传输信令；以及所述终端向所述接入网设备发送无线资源控制RRC消息，所述RRC消息由所述第二寻呼消息触发。在该方面中，网络触发终端接入时，可以在寻呼消息中指示是为了定位和/或为了传输信令对终端进行寻呼，触发终端是为了定位和/或为了传输信令进行接入，因而，接入网设备不会为该终端配置DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，可以减少终端的处理复杂度，减少通信时延，降低对关键业务性能指标的影响。
第四方面，提供了一种通信方法，所述方法包括：接入网设备接收来自接入管理功能(access management function，AMF)网元的第一寻呼消息，所述第一寻呼消息包括第一指示信息，所述第一指示信息用于指示以下至少一项：为了定位、或为了传输信令；所述接入网设备根据所述第一寻呼消息，向终端发送第二寻呼消息；以及所述接入网设备接收来自所述终端的RRC消息，所述RRC消息由所述第二寻呼消息触发。可选的，所述第二寻呼消息包括第二指示信息，所述第二指示信息用于指示以下至少一项：为了定位、或为了传输信令。在该方面中，接入网设备根据第一寻呼消息中指示是为了定位/或传输信令进行寻呼，因而，不会为终端配置DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少通信时延，降低对关键业务性能指标的影响。
第五方面，提供了一种通信方法，所述方法包括：接入管理功能(access management function，AMF)网元向接入网设备发送第一寻呼消息，所述第一寻呼消息包括第一指示信息，所述第一指示信息用于指示以下至少一项：为了定位、或为了传输信令；以及所述接入管理功能网元接收来自接入网设备的非接入层(non-access stratum，NAS)消息，所述NAS消息由所述第一寻呼消息触发。在该方面中，网络触发终端接入时，可以在寻呼消息中指示是为了定位进行寻呼和/或为了传输信令进行寻呼，使得接入网设备获知寻呼是为了进行寻呼和/或为了传输信令，因而，接入网设备不会为终端配置DRB，可以正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少通信时延，降低对关键业务性能指标的影响。
第六方面，提供了一种通信方法，所述方法包括：终端向接入网设备发送指示信息，所述指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型；以及所述终端接收来自AMF网元的NAS消息。在该方面中，终端在接入网络后，可以通知AMF本次接入的目的不是传输业务数据，从而使得AMF决策不为该终端建立会话，从而可以正常通信。该方法尤其适用于定位场景，可以节省信令资源，减少通信时延。
第七方面，提供了一种通信方法，所述方法包括：接入管理功能网元接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型；所述接入管理功能网元确定不建立会话；以及所述接入管理功能网元向所述终端发送NAS消息。在该方面中，终端在接入网络后，AMF接收终端的通知，本次接入的目的不是传输业务数据， 从而使得AMF决策不为该终端建立会话，从而可以正常通信。该方法尤其适用于定位场景，可以节省信令资源，减少通信时延。
结合第六方面或第七方面，在一种可能的实现中，在所述指示信息用于指示进行定位的情况下，所述指示信息包括以下至少一项：为了定位进行注册、定位、或定位业务。在该实现中，通过上述至少一项指示信息，可以明确地指示进行定位，提高了AMF的处理效率。
结合第六方面或第七方面，在又一种可能的实现中，所述指示信息包括在注册请求消息中，所述指示信息为第一注册类型；或所述指示信息包括在控制面业务请求消息中，所述指示信息为第一控制面业务类型；或所述指示信息包括在业务请求消息中，所述指示信息为第一业务类型。在该实现中，AMF接收到该注册请求消息/控制面业务请求消息/业务请求消息，获取其中的5G系统注册类型取值，当注册类型/控制面业务类型/业务类型是为了定位进行注册或者接入时，可以明确地确定不建立会话。从而可以节省信令资源，减少通信时延。
结合第六方面或第七方面，在又一种可能的实现中，在所述指示信息用于指示传输信令的情况下，所述指示信息包括以下至少一项：为了传输控制信令进行注册、仅传输控制信令、仅有控制信令、仅有信令、或信令业务。在该实现中，通过上述至少一项指示信息，可以明确地指示进行信令传输，提高了AMF的处理效率。
结合第六方面或第七方面，在又一种可能的实现中，所述指示信息包括在注册请求消息中，所述指示信息为第二注册类型；或所述指示信息包括在控制面业务请求消息中，所述指示信息为第二控制面业务类型；或所述指示信息包括在业务请求消息中，所述指示信息为第二业务类型。在该实现中，AMF接收到该注册请求消息/控制面业务请求消息/业务请求消息，获取其中的5G系统注册类型取值/控制面业务类型取值/业务类型取值，当注册类型/控制面业务类型/业务类型是为了传输控制信令进行注册或者接入时，确定不建立会话。从而可以节省信令资源，减少通信时延。
第八方面，提供了一种通信装置，可以实现上述第一方面中的通信方法。例如所述通信装置可以是芯片或者终端。可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于向接入网设备发送指示信息，所述指示信息用于指示以下至少一项：进行定位、所述通信装置类型、或传输信令；以及所述收发单元还用于接收来自所述接入网设备的RRC消息，所述RRC消息为所述通信装置配置SRB2，以及未配置DRB。
第九方面，提供了一种通信装置，可以实现上述第二方面中的通信方法。例如所述通信装置可以是芯片或者接入网设备，可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；所述收发单元还用于向所述终端发送RRC消息，所述RRC消息为终端配置SRB2，以及未配置DRB。
第十方面，提供了一种通信装置，可以实现上述第三方面中的通信方法。例如所述通信装置可以是芯片或者终端。可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于接收来自接入网设备的第二寻呼消息，所述第二寻呼消息包括第二指示信息， 所述第二指示信息用于指示以下至少一项：为了定位、或为了传输信令；以及所述收发单元还用于向所述接入网设备发送RRC消息，所述RRC消息由所述第二寻呼消息触发。
第十一方面，提供了一种通信装置，可以实现上述第四方面中的通信方法。例如所述通信装置可以是芯片或者接入网设备，可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于接收来自AMF网元的第一寻呼消息，所述第一寻呼消息包括第一指示信息，所述第一指示信息用于指示以下至少一项：为了定位、或为了传输信令；所述收发单元还用于根据所述第一寻呼消息，向终端发送第二寻呼消息；以及所述收发单元还用于接收来自所述终端的RRC消息，所述RRC消息由所述第二寻呼消息触发。
第十二方面，提供了一种通信装置，可以实现上述第五方面中的通信方法。例如所述通信装置可以是芯片或者接入管理功能网元，可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于向接入网设备发送第一寻呼消息，所述第一寻呼消息包括第一指示信息，所述第一指示信息用于指示以下至少一项：为了定位、或为了传输信令；以及所述收发单元还用于接收来自终端的NAS消息，所述NAS消息由所述第一寻呼消息触发。
第十三方面，提供了一种通信装置，可以实现上述第六方面中的通信方法。例如所述通信装置可以是芯片或者终端。可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于向AMF网元发送指示信息，所述指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型；以及所述收发单元还用于接收来自所述AMF网元的NAS消息。
第十四方面，提供了一种通信装置，可以实现上述第七方面中的通信方法。例如所述通信装置可以是芯片或者接入管理功能网元，可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现方式中，所述通信装置，可以包括收发单元和处理单元；其中：所述收发单元用于接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型；所述处理单元用于确定不建立会话；以及所述收发单元还用于向所述终端发送NAS消息。
在一种可能的实现方式中，上述第八方面至第十四方面中的通信装置包括与存储器耦合的处理器；所述处理器被配置为支持所述装置执行上述通信方法中相应的功能。存储器用于与处理器耦合，其保存所述装置必要的程序(指令)和/或数据。可选的，所述通信装置还可以包括通信接口用于支持所述装置与其他网元之间的通信。可选的，该存储器可以位于该通信装置内部，也可以位于该通信装置外部。
在又一种可能的实现方式中，上述第八方面至第十四方面中的通信装置包括处理器和收发装置，所述处理器与所述收发装置耦合，所述处理器用于执行计算机程序或指令，以控制所述收发装置进行信息的接收和发送；当所述处理器执行所述计算机程序或指令时，所述处理器还用于通过逻辑电路或执行代码指令实现上述方法。其中，所述收发装置可以为收发器、收发电路或输入输出接口，用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置。当所述通 信装置为芯片时，所述收发装置为收发电路或输入输出接口。
当上述第八方面至第十四方面中的通信装置为芯片时，发送单元可以是输出单元，比如输出电路或者通信接口；接收单元可以是输入单元，比如输入电路或者通信接口。当所述通信装置为终端时，发送单元可以是发射器或发射机；接收单元可以是接收器或接收机。
第十五方面，提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有计算机程序或指令，当所述计算机程序或指令被执行时，实现上述各方面所述的方法。
第十六方面，提供了一种包含指令的计算机程序产品，当该指令在通信装置上运行时，使得通信装置执行上述各方面所述的方法。
第十七方面，提供了一种通信系统，该通信系统包括第八方面的通信装置和第九方面的通信装置。
第十八方面，提供了一种通信系统，该通信系统包括第十方面的通信装置、第十一方面的通信装置和第十二方面的通信装置。
第十九方面，提供了一种通信系统，该通信系统包括第十三方面的通信装置和第十四方面的通信装置。
附图说明
图1为应用本申请实施例的通信方法的一个通信系统的架构示意图；
图2为长期演进定位协议栈示意图；
图3为本申请实施例提供的一种通信方法的流程示意图；
图4为本申请实施例提供的初始接入流程示意图；
图5为本申请实施例提供的RRC连接恢复流程示意图；
图6为本申请实施例提供的另一种通信方法的流程示意图；
图7为本申请实施例提供的又一种通信方法的流程示意图；
图8为本申请实施例提供的终端注册到AMF的流程示意图；
图9为本申请实施例提供的终端向AMF发起控制面业务请求的流程示意图；
图10为本申请实施例提供的终端向AMF发起业务请求的流程示意图；
图11为本申请实施例提供的又一种通信方法的流程示意图；
图12为本申请实施例提供的一种通信装置的结构示意图；
图13为本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
下面结合本申请实施例中的附图对本申请实施例进行描述。
本申请实施例的技术方案可以应用于各种通信系统。例如：长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)系统、第五代(5th generation，5G)系统或新无线(new radio，NR)。本申请中涉及的5G移动通信系统包括非独立组网(non-standalone，NSA)的5G移动通信系统和独立组网(standalone，SA)的5G移动通信系统。本申请提供的技术方案还可以应用于未来的通信系统，如第六代移动通信系统。通信系统还可以是陆上公用移动通信网(public land mobile network，PLMN)网络、设备到设备(device-to-device，D2D)通信系统、机器到机器(machine to machine，M2M)通信系统、物联网(Internet of Things，IoT)、车联网通信系统或者其他通信系统。
示例性的，图1为在5G移动通信系统中应用本申请实施例的通信方法的一个通信系统 的架构示意图。如图1所示，该通信系统中，终端与接入网设备可以通过空口进行通信。终端还可以通过接入网设备与核心网设备进行通信。下面以接入网设备包括下一代节点B(next-generation node B，gNB)，核心网设备包括AMF网元与定位管理功能(location management function，LMF)网元为例进行说明。终端可以通过第一接口(例如，NR-Uu接口)与下一代节点B(next-generation node B，gNB)连接。gNB通过第二接口(例如，NG-C接口)与AMF网元连接到。其中，接入网(next设备可以包括一个或多个gNB(图1以两个gNB为例进行示意)。gNB为接入5G核心网的5G基站。其中，AMF网元用于实现接入管理等功能，LMF网元用于实现定位或定位辅助等功能。AMF网元与LMF网元之间通过第三接口(例如，NL1接口)连接。在本申请中的节点(node)可以是通信系统中的设备，例如可以是接入网设备，也可以是终端，也可以是核心网设备中的网元。
应理解，上述图1的通信系统中包括的设备或功能节点只是示例性地描述，并不对本申请实施例构成限定。事实上，图1的通信系统中还可以包含其他与图中示意的设备或功能节点具有交互关系的网元或设备或功能节点，这里不作具体限定。
可选的，本申请实施例中的终端可以指接入终端、用户单元、用户站、移动站、移动台、中继站、远方站、远程终端、移动设备、用户终端(user terminal)、用户设备(user equipment，UE)、终端(terminal)、无线通信设备、用户代理、用户装置、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端或者未来演进的PLMN中的终端或者未来车联网中的终端等，本申请实施例对此并不限定。
作为示例而非限定，在本申请实施例中，终端可以是手机、平板电脑、带无线收发功能的电脑、虚拟现实终端、增强现实终端、工业控制中的无线终端、无人驾驶中的无线终端、远程手术中的无线终端、智能电网中的无线终端、运输安全中的无线终端、智慧城市中的无线终端、智慧家庭中的无线终端等。
作为示例而非限定，在本申请实施例中，可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
此外，在本申请实施例中，终端还可以是物联网(internet of things，IoT)系统中的终端，IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。在本申请实施例中，IOT技术可以通过例如窄带(narrow band，NB)技术，做到海量连接，深度覆盖，终端省电。
此外，在本申请实施例中，终端还可以包括智能打印机、火车探测器、加油站等传感器，主要功能包括收集数据(部分终端)、接收接入网设备的控制信息与下行数据，并发送电磁波，向接入网设备传输上行数据。
可选的，本申请实施例中的接入网设备可以是用于与终端通信的任意一种具有无线收发功能的通信设备。该接入网设备包括但不限于：演进型节点B(evolved node B,eNB)，基带单元(baseband unit，BBU)，无线保真(wireless fidelity，WIFI)系统中的接入点(access point， AP)、无线中继节点、无线回传节点、传输点(transmission point，TP)或者传输接收点(transmission reception point，TRP)等。该接入网设备还可以为5G系统中的gNB或TRP或TP，或者5G系统中的基站的一个或一组(包括多个天线面板)天线面板。此外，该接入网设备还可以为构成gNB或TP的网络节点，如BBU，或分布式单元(distributed unit，DU)等。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。此外，gNB还可以包括有源天线单元(active antenna unit，AAU)。CU实现gNB的部分功能，DU实现gNB的部分功能。比如，CU负责处理非实时协议和服务，实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能。DU负责处理物理层协议和实时服务，实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理层(physical layer，PHY)的功能。AAU实现部分物理层处理功能、射频处理及有源天线的相关功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令，也可以认为是由DU发送的，或者，由DU和AAU发送的。可以理解的是，接入网设备可以为包括CU节点、DU节点、AAU节点中一项或多项的设备。
可选的，本申请实施例中的接入网设备和终端之间可以通过授权频谱进行通信，也可以通过免授权频谱进行通信，也可以同时通过授权频谱和免授权频谱进行通信。接入网设备和终端之间可以通过6千兆赫(gigahertz，GHz)以下的频谱进行通信，也可以通过6GHz以上的频谱进行通信，还可以同时使用6GHz以下的频谱和6GHz以上的频谱进行通信。本申请的实施例对接入网设备和终端之间所使用的频谱资源不做限定。
可选的，本申请实施例中的终端和接入网设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对终端和接入网设备的应用场景不做限定。
对本申请涉及的SRB和DRB的概念进行描述：
第五代(5 th generation，5G)移动通信终端在初始接入网络时，会分别与接入网设备、核心网建立控制面和数据面的信令连接。终端与接入网设备之间的消息信令承载分为SRB和DRB。SRB定义为用来传输无线资源控制(radio resource control，RRC)消息和非接入层(non-access stratum，NAS)消息的控制面数据无线承载，DRB用来传输用户面数据的无线承载。
其中，SRB又可以分为：SRB0，SRB1，SRB2和SRB3。具体来说：
SRB0用来传输采用公共控制信道(common control channel，CCCH)传输的RRC消息。其中，CCCH为公共控制信道，用于终端和网络在没有RRC连接时传输控制信息。
SRB1用来传输RRC消息，以及传输在SRB2建立之前的NAS消息，这些消息采用专用控制信道(dedicated control channel，DCCH)传输。DCCH信道为专用控制信道，用于具有RRC连接的终端与网络之间点对点传输专用控制信息的双向信道。
SRB2用来传输NAS消息和RRC消息，这些消息采用DCCH信道传输。
SRB3用来传输双链接时的RRC消息，这些消息采用DCCH信道传输。
定位信令传输
对于定位业务，涉及到终端与接入网设备、终端与AMF网元、终端与LMF网元，以及接入网设备与LMF的信令交互。其中，终端与LMF之间的协议接口为长期演进定位协议(LTE positioning protocol，LPP)。终端与LMF之间的LPP消息承载在NAS消息中，其协议栈如图 2所示。因此，定位业务需要终端接入网络并建立SRB2。
然而，在现有3GPP协议标准中，SRB2的建立要伴随着DRB一起建立。对于进行某些业务(例如，定位)的终端，没有数据传输需求，建立DRB会导致信令时延以及空口信令资源的浪费。因此，建立DRB对于这些终端来说无意义且带来时延，影响这些业务的性能指标。
为此，本申请实施例提供一种通信方案，终端通过向接入网设备发送指示信息，可以使得接入网设备明确地获知无需为该终端建立DRB，从而决策不为该终端建立DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少终端的处理复杂度，减少通信时延，降低对关键业务性能指标的影响。
如图3所示，为本申请实施例提供的一种通信方法的流程示意图，该方法可以包括以下步骤：
S301.终端向接入网设备发送指示信息。
终端发送指示信息给接入网设备。其中，该指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令。可选地，该指示信息可以是一种直接或间接的指示。终端通过该指示信息通知接入网设备该终端与接入网设备之间存在控制信令传输需求，不存在数据传输需求。
其中，该指示信息用于指示以下至少一项：进行定位、或传输信令时，上述不存在数据传输需求可以是指终端本次接入没有数据传输或者始终没有数据传输。
该指示信息用于指示终端类型时，上述不存在数据传输需求可以是指始终没有数据传输。
S302.接入网设备向终端发送RRC消息。
接入网设备在接收到上述指示信息后，确定终端后续没有数据传输需求，则选择配置SRB2，不配置DRB。因此，接入网设备向终端发送RRC消息。其中，该RRC消息为终端配置SRB2，以及未配置DRB。
可选地，该通信方法应用于定位场景时，该方法还可以包括以下步骤(图中以虚线表示)：
S303.终端通过接入网设备向AMF送移动定位位置请求(Mobile Originiated Location Request)消息。
终端可以通过该SRB2向AMF发送移动定位位置请求消息。
S304.AMF向LMF发送确定位置请求(Determine Location Request)消息。
AMF收到终端的请求后，可以向LMF发送确定位置请求消息，以请求终端位置。
S305.LMF对终端进行定位。
S306.LMF向AMF发送确定位置响应(Determine location response)消息，该消息包括终端位置。
LMF对终端进行定位后，向AMF发送确定位置响应消息，以将终端位置返回AMF。
S307.AMF通过接入网设备向终端发送移动定位位置响应(Mobile Originiated Location Response)消息，该消息包括终端位置。
AMF获取到终端位置后，通过移动定位位置响应消息将位置返回给终端。
可替换地，终端接入网络后，可以由AMF向LMF发送确定位置请求消息，以请求终端位置，即可以不包括上述步骤S303。LMF继而对终端进行定位并向AMF发送确定位置响应消息，以将位置结果返回AMF。
关于上述步骤S301，即终端如何发送指示信息，可以有以下多种实现：
在一个实现中，如图4所示的本申请实施例提供的初始接入流程示意图，该流程包括以下步骤：
S401.终端向接入网设备发送RRC建立请求(RRCSetupRequest)消息。
例如，处于无线资源控制-空闲态(RRC-IDLE)的终端向接入网设备发送RRC建立请求消息。
其中，RRC建立请求消息可以包括上述指示信息。
在上述指示信息用于指示进行定位的情况下，该指示信息包括以下至少一项：定位(positioning)、定位信令(positioning-signaling)、定位业务(location service)、或定位业务信令(location-signaling)。该指示信息还可以是其他能指示进行定位的信息，本申请不限定。示例性地，该指示信息为建立原因，此处可以称其为第一建立原因。当然，该指示信息不限定为原因。该指示信息还可以是信元、消息类型、或者其它能进行指示的信息。
或者，在上述指示信息用于指示传输信令的情况下，该指示信息包括以下至少一项：信令(signaling)、仅有信令(signaling-only)、或控制信令(control-signaling)。该指示信息还可以是其他能指示进行信令传输的信息，本申请不限定。示例性地，该指示信息为建立原因，此处可以称其为第二建立原因。当然，该指示信息不限定为原因。该指示信息还可以是信元、消息类型、或者其它能进行指示的信息。
示例性地，RRC建立请求消息中可以包括建立原因(establishmentCause)信元(information element，IE)。该信元的取值可以包括上述任一种建立原因。
S402.接入网设备向终端发送RRC建立消息。
接入网设备接收到RRC建立请求消息后，向终端发送RRC建立消息。
上述RRC建立请求消息和RRC建立消息采用SRB0发送。
终端收到接入网设备发送的RRC建立消息，建立SRB1。至此，终端进入RRC连接态(RRC connected)。
S403.终端向接入网设备发送RRC建立完成(RRCSetupComplete)消息。
终端用SRB1向接入网设备发送RRC建立完成消息。该消息携带初始NAS消息，用于建立NAS连接。在SRB2建立之前，后续NAS消息可通过SRB1发送。
可选地，在步骤S403之后还可以进行步骤S404。
S404.接入网设备向终端发送RRC重配置(RRCReconfiguration)消息。
接入网设备接收到上述RRC建立请求消息的上述指示信息，或者解析其中的建立原因后，确定终端发起该RRC建立请求没有数据传输需求，则选择配置SRB2，不配置DRB。接收网设备向终端发送RRC重配置消息，该RRC重配置消息为终端配置SRB2，以及未配置DRB。
终端收到上述RRC重配置消息，建立SRB2。步骤404可以看做是图3所示实施例中步骤S302的一个示例。
S405.终端向接入网设备发送RRC重配置完成(RRCReconfigurationComplete)消息。
至此，终端完成建立SRB2，后续NAS消息通过SRB2发送。
可选的，在另外的实现中，接入网设备接收到上述RRC建立请求消息的上述指示信息，或者解析其中的建立原因后，也可以确定不配置SRB2和DRB。即，上述RRC重配置消息没有配置SRB2或者DRB。终端向网络发送的NAS消息，例如承载LPP消息的NAS消息，均通过SRB1发送。
在另一个实现中，如图5所示的本申请实施例提供的RRC连接恢复流程示意图。对于处于RRC非激活态(RRC inactive)的终端，通过恢复RRC连接进入连接态。该方法可以包括以下步骤：
S501.终端向接入网设备发送RRC恢复请求(RRC Resume Request)消息。
例如，终端处于RRC非激活态，在SRB0上向接入网设备发送RRC恢复请求消息。
RRC恢复请求消息可以包括上述指示信息。
在上述指示信息用于指示进行定位的情况下，该指示信息包括以下至少一项：定位(positioning)、定位信令(positioning-signaling)、定位业务(location service)、或定位业务信令(location-signaling)。该指示信息还可以是其他能指示进行定位的信息，本申请不限定。示例性的，该指示信息为第一恢复原因(resumeCause)。该指示信息还可以是信元、消息类型、或者其它能进行指示的信息。
或者，在上述指示信息用于指示传输信令的情况下，该指示信息包括以下至少一项：信令(signaling)、仅有信令(signaling-only)、或控制信令(control-signaling)。该指示信息还可以是其他能指示进行信令传输的信息，本申请不限定。示例性的，该指示信息为第二恢复原因。该指示信息还可以是信元、消息类型、或者其它能进行指示的信息。
示例性地，RRC恢复请求消息中可以包括resumeCause信元，在该信元的取值中，包括上述任一种恢复原因。
S502.接入网设备向终端发送RRC恢复(RRC Resume)消息。
接入网设备收到RRC恢复请求消息后，恢复终端的SRB1，并通过SRB1向终端发送RRC恢复消息。
S503.终端向接入网设备发送RRC恢复完成(RRC Resume Complete)消息。
终端收到上述RRC恢复消息后，进入连接态，向接入网设备发送RRC恢复完成消息。
可选地，在步骤S503之后还可以进行步骤S504。
S504.接入网设备向终端发送RRC重配置(RRCReconfiguration)消息。
接入网设备接收到上述RRC恢复请求消息的上述指示信息，或者，解析其中的恢复原因后，确定终端发起该RRC恢复请求没有数据传输需求，则选择恢复或者配置SRB2，不恢复或者不配置DRB。接入网设备向终端发送RRC重配置消息，该RRC重配置消息为终端恢复或者建立SRB2，以及未恢复或者未配置DRB。
可选地，接入网设备不恢复或者不配置DRB可以是：接入网设备不为终端恢复或不建立DRB；或者，接入网设备原来已为该终端建立DRB，则在接收到RRC恢复完成消息后，通过该RRC重配置消息释放该DRB。
终端收到该RRC重配置消息，恢复或者建立SRB2。
步骤S504可以看做是图3所示实施例中步骤S302的一个示例。
S505.终端向接入网设备发送RRC重配置完成(RRCReconfigurationComplete)消息。
至此，终端完成恢复或者建立SRB2，后续NAS消息通过SRB2发送。
可选的，在另外的实现中，接入网设备接收到上述RRC恢复请求消息的上述指示信息，或者解析其中的恢复原因后，也可以确定不恢复或者不配置SRB2和DRB。即，上述RRC重配置消息没有恢复或者没有配置SRB2以及DRB。或者，接入网设备原来已经为该终端建立SRB2和/或DRB的情况下，该RRC重配置消息释放SRB2和/或DRB。终端向网络发送的NAS消息，例如承载LPP消息的NAS消息，均通过SRB1发送。
在又一个实现中，仍参考图4，与上述实现不同的是，RRC建立请求消息不作改变，即RRC建立请求消息中不包括上述指示信息。该指示信息包含在RRC建立完成消息中。该指示信息所指示的信息可参考上述实现方式的描述。
接入网设备接收到上述RRC建立完成消息的上述指示信息后，确定该初始接入不包括数 据传输需求，可以选择确定为终端配置SRB2，不配置DRB。接收网设备向终端发送RRC重配置消息，该RRC重配置消息为终端配置SRB2，以及未配置DRB。终端收到该RRC重配置消息，建立SRB2。至此，终端完成建立SRB2，后续NAS消息通过SRB2发送。
可选的，在另外的实现中，接入网设备接收到上述RRC建立完成消息的上述指示信息后，也可以确定不配置SRB2和不配置DRB。即，上述RRC重配置消息没有配置SRB2或者DRB。终端向网络发送的NAS消息，例如承载LPP消息的NAS消息，均通过SRB1发送。
在又一个实现中，仍参考图4，该指示信息包含在RRC建立请求消息或RRC建立完成消息中。在该指示信息用于指示终端类型为定位的终端的情况下，该指示信息包括以下至少一项：定位的节点指示(pos-NodeIndication)、或定位指示(pos-Indication)。该指示信息还可以是其他能指示终端类型为定位的终端的信息，本申请不限定。或者，在该指示信息用于指示终端类型为传输信令的终端的情况下，该指示信息包括以下至少一项：信令的节点指示、或仅有信令的节点指示(signalingOnly-NodeIndication)。该指示信息还可以是其他能指示终端类型为传输信令的终端的信息，本申请不限定。或者，该指示信息可以用于指示其他的终端类型，则该指示信息可以例如是能力降低型(reduced capability，redcap)节点，能力降低性定位节点，低功耗高精度定位(low power high accuracy positioning，LPHAP)节点，本申请不限定。此处节点可以理解为终端。
接入网设备接收到上述RRC建立请求消息或RRC建立完成消息的上述指示信息后，确定该初始接入不包括数据传输需求，可以选择确定为终端配置SRB2，不配置DRB。接收网设备向终端发送RRC重配置消息，该RRC重配置消息为终端配置SRB2，以及未配置DRB。终端收到该RRC重配置消息，建立SRB2。至此，终端完成建立SRB2，后续NAS消息通过SRB2发送。
可选的，在另外的实现中，接入网设备接收到上述RRC建立请求消息或RRC建立完成消息的上述终端类型的指示信息后，可以确定不配置SRB2和不配置DRB。即，上述RRC重配置消息没有配置SRB2或者DRB。终端向网络发送的NAS消息，例如承载LPP消息的NAS消息，均通过SRB1发送。
在又一个实现中，仍参考图5，与上述实现不同的是，RRC恢复请求消息不作改变，即RRC恢复请求消息中不包括上述指示信息。该指示信息包含在RRC恢复完成消息中。该指示信息所指示的内容可参考上面的描述。
接入网设备接收到上述RRC恢复完成消息的上述指示信息后，确定终端发起该RRC恢复没有数据传输需求，则选择恢复或者配置SRB2，不恢复或者不配置DRB。接入网设备向终端发送RRC重配置消息，该RRC重配置消息为终端恢复或者建立SRB2，以及未恢复或者未配置DRB。
可选地，接入网设备不恢复或者不配置DRB可以是：接入网设备不为终端恢复或者不建立DRB；或者，接入网设备原来已为该终端建立DRB，则在接收到RRC恢复完成消息后，通过该RRC重配置消息释放该DRB。
终端收到该RRC重配置消息，恢复或者建立SRB2。至此，终端完成恢复或者建立SRB2，后续NAS消息通过SRB2发送。
可选的，在另外的实现中，接入网设备接收到上述RRC恢复完成消息的上述指示信息后，也可以确定不恢复或者不配置SRB2和DRB。即，在RRC重配置消息中，没有恢复或者没有配置SRB2以及DRB。或者，接入网设备原来已经为该终端建立SRB2和/或DRB的情况下，接入网设备通过该RRC重配置消息为终端释放SRB2和/或DRB。终端向网络发送的NAS 消息，例如承载LPP消息的NAS消息，均通过SRB1发送。
根据本申请实施例提供的一种通信方法，终端通过发送指示信息，可以使得接入网设备明确地获知无需为该终端建立DRB，从而决策不为该终端建立DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少终端的处理复杂度，减少通信时延，降低对关键业务性能指标的影响(例如，对于进行定位或定位终端类型为专做定位的终端来说，接入网设备选择为终端建立SRB2，而不配置DRB，可以减少通信时延，降低对定位业务性能指标的影响)。
上述实施例描述了在终端发起接入或发起恢复连接时，通过指示信息指示终端当前没有数据传输需求。在下面的实施例中，则是由网络触发终端接入。
如图6所示，为本申请实施例提供的另一种通信方法的流程示意图，该方法可以包括以下步骤：
S601.AMF向接入网设备发送第一寻呼(paging)消息。
终端处于空闲态，网络触发终端接入网络。示例性地，AMF向接入网设备发送第一寻呼消息。接入网设备接收该第一寻呼消息。其中，该第一寻呼消息包括第一指示信息，第一指示信息用于指示以下至少一项：为了定位、或为了传输信令。即网络是为了定位或为了传输信令触发终端接入网络。
示例性地，第一寻呼消息中可以包括以下至少一种信元：为了定位进行寻呼(paging for positioning)、为了信令进行寻呼(paging for signaling)、为了仅传输信令进行寻呼(paging for signaling only)、或寻呼目的(paging purpose)，其中paging purpose的取值可以为：定位(pos/positioning),或者信令(signaling)等。或者第一寻呼消息中可以包括其他能指示为了定位或者传输信令进行寻呼的信元，此处不限定。示例性地，寻呼消息中的Assistance Data for Paging信元中，可以包括paging for positioning信元。
S602.接入网设备接收第一寻呼消息后，向终端发送第二寻呼消息。
接入网设备接收到上述第一寻呼消息后，确定AMF发送该第一寻呼消息是为了定位/或传输信令进行寻呼，和/或，为了传输信令对终端进行寻呼。因此，接入网设备发送第二寻呼消息。具体地，接入网设备接收到第一寻呼消息后，解析第一寻呼消息，获得其中的指示信息，并生成第二寻呼消息。可选地，第二寻呼消息包括第二指示信息，第二指示信息用于指示以下至少一项：为了定位、或为了传输信令。该第二指示信息的内容可以与上述第一指示信息相同。
示例性地，在第二寻呼消息中可以包括以下至少一种信元：paging for positioning，或者，paging for pos；或者paging for signaling，或者paging for signaling only。或者第二寻呼消息中可以包括其他能指示为了定位或者传输信令进行寻呼的信元，此处不限定。
示例性地，在第二寻呼消息中可以包括信元：paging purpose，其取值为：pos/positioning/signaling等，表示取值可以是pos、positioning、或signaling。
S603.终端向接入网设备发送RRC消息。
终端接收到上述第二寻呼消息后，可以获知网络寻呼触发其接入网络是为了定位/或传输信令进行寻呼，和/或，为了传输信令对终端进行寻呼。终端存在两种实现方式：
一种实现为，终端在后续发起接入的流程中，终端向接入网设备发送RRC建立请求消息，该消息由上述第二寻呼消息触发。该RRC建立请求消息包括指示信息，指示以下至少一项：进行定位、终端类型、或传输信令，则接入网设备选择为该终端配置SRB2，不为该终端配置 DRB，或者，不为该终端配置SRB2以及DRB。该指示信息具体可以是建立原因、信元或指示等。或者，该指示信息包含在RRC建立完成消息中。具体参考图3和图4所示方法，此处不再赘述。
另一种实现为终端不作额外处理，即RRC建立请求消息以及RRC建立完成消息不包含上述指示信息，由接入网设备确定为该终端配置SRB2，不为该终端配置DRB。因此，终端向接入网设备发送RRC建立请求消息，该消息由上述第二寻呼消息触发。接入网设备在收到终端的RRC建立请求消息后，根据第一指示信息确定不为终端建立DRB，或者不为终端配置SRB2以及DRB。接入网设备向终端发送RRC建立消息。终端向接入网设备发送RRC建立完成消息。该RRC建立完成消息中包含NAS消息。可选地，在该实现中，上述第二寻呼消息可以不包括第二指示信息。
又一种实现为，终端在后续发起接入的流程中，终端向接入网设备发送RRC恢复请求消息，该消息由上述第二寻呼消息触发。该RRC恢复请求消息包括指示信息，指示以下至少一项：进行定位、终端类型、或传输信令，则网络选择为该终端恢复或者配置SRB2，不为该终端恢复或者配置DRB，或者，不为该终端恢复或者配置SRB2以及DRB。该指示信息具体可以是建立原因、信元或指示等。或者，该指示信息包含在RRC恢复完成消息中。具体参考图3和图5所示方法，此处不再赘述。
又一种实现为终端不作额外处理，既RRC恢复请求消息以及RRC恢复完成消息不包含上述指示信息，由网络确定为该终端恢复或者配置SRB2，不为该终端恢复或者配置DRB。因此，终端向接入网设备发送RRC恢复请求消息，该消息由上述第二寻呼消息触发。接入网设备在收到终端的RRC恢复请求消息后，根据第一指示信息确定不为终端恢复或者建立DRB，或者不为终端恢复或者配置SRB2以及DRB。接入网设备向终端发送RRC恢复消息。终端向接入网设备发送RRC恢复完成消息。该RRC恢复完成消息中包含NAS消息。可选地，在该实现中，上述第二寻呼消息可以不包括第二指示信息。
S604.接入网设备接收来自终端的RRC消息后，接入网设备向AMF转发RRC消息中所包含的NAS消息。该NAS消息由上述第一寻呼消息触发。
在一个例子中，接入网设备接收终端发送的RRC建立完成消息。该RRC建立完成消息中包含NAS消息。接入网设备获取RRC建立完成消息中的NAS消息，并向AMF转发该NAS消息。AMF接收该NAS消息。
在另一个例子中，接入网设备接收终端发送的RRC恢复完成消息。该RRC恢复完成消息中包含NAS消息。接入网设备获取RRC恢复完成消息中的NAS消息，并向AMF转发该NAS消息。AMF接收该NAS消息。
示例性地，该NAS消息可以是业务请求(service request)消息或者控制平面业务请求(control plane service request)消息。
示例性地，AMF接收到该NAS消息后，确定终端接入，则可以向LMF发送确定位置请求(Determine Location Request)消息，以请求UE位置。LMF继而对终端进行定位并通过确定位置响应(Determine Location Response)消息，以将位置结果返回AMF。
根据本申请实施例提供的一种通信方法，网络触发终端接入时，可以在寻呼消息中指示是为了定位进行寻呼和/或为了传输信令进行寻呼，因而，不会为该终端配置DRB，可以保障正常通信。该方法尤其适用于定位场景，可以节省空口资源，减少终端的处理复杂度，减少通信时延，降低对关键业务性能指标的影响。
在核心网侧，AMF会为初始接入的终端建立分组数据单元(packet data unit，PDU)会话。对于没有数据传输需求的终端来说，为该终端建立PDU会话会导致信令时延以及网络信令资源的浪费。
如图7所示，为本申请实施例提供的又一种通信方法的流程示意图，该方法可以包括以下步骤：
S701.终端向AMF发送指示信息。
终端向AMF发送指示信息。其中，该指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型。该指示信息携带在NAS消息中。
示例性地，在上述指示信息用于指示进行定位的情况下，该指示信息包括以下至少一项：为了定位进行注册(registration for positioning)、定位(positioning)、或定位业务(positioning service)。该指示信息还可以是其他能指示进行定位的信息，本申请不限定。
在上述指示信息用于指示传输信令的情况下，该指示信息包括以下至少一项：为了传输控制信令进行注册(registration for signaling)、仅传输控制信令(signaling only)、仅有控制信令、仅有信令、或信令业务(signaling service)。该指示信息还可以是其他能指示传输信令的信息，本申请不限定。
在该指示信息用于指示终端类型为定位的终端的情况下，该指示信息包括以下至少一项：定位的节点指示(pos-NodeIndication)、或定位指示(pos-Indication)。该指示信息还可以是其他能指示终端类型为定位的终端的信息，本申请不限定。此处节点可以理解为终端。
在该指示信息用于指示终端类型为传输信令的终端的情况下，该指示信息包括以下至少一项：信令的节点指示、或仅有信令的节点指示(signalingOnly-NodeIndication)。该指示信息还可以是其他能指示终端类型为传输信令的终端的信息，本申请不限定。此处节点可以理解为终端。
该指示信息可以用于指示其他的终端类型，则该指示信息可以例如是能力降低型(reduced capability，redcap)节点，能力降低性定位节点，低功耗高精度定位(low power high accuracy positioning，LPHAP)节点，本申请不限定。
上述指示信息还可以是信元、消息类型、或者其它能进行指示的信息。
S702.AMF确定不建立会话。
AMF获取指示信息，确定终端接入网络是进行定位或传输信令，或者确定终端的类型，AMF根据该指示信息，确定不建立PDU会话。不建立PDU会话，可以节省信令开销，并减小时延，也不会影响业务关键性能指标。
S703.AMF通过接入网设备向终端发送NAS消息。
该NAS消息是用于对携带上述指示信息的NAS消息的响应。
具体地，在终端注册场景，该NAS消息可以是注册接受(registration accepted)消息。在控制面业务请求场景，该NAS消息可以是控制面业务接受(Service Accept)消息。在业务请求场景，该NAS消息可以是业务接受消息。
在一个实现中，如图8所示的终端注册到AMF的流程示意图，该流程包括以下步骤：
S801.终端向AMF发送注册请求(registration request)消息。
该注册请求消息可以包括上述指示信息。该指示信息的含义可参考上述步骤S701中的描述。
示例性地，在上述指示信息用于指示进行定位的情况下，该指示信息用于指示为了定位进行注册时，该指示信息具体可以为第一注册类型。或者，该指示信息可以用于指示定位。
示例性地，在上述指示信息用于指示传输信令的情况下，该指示信息用于为了传输信令进行注册时，该指示信息具体可以为第二注册类型。或者，该指示信息可以用于指示仅传输控制信令、仅有控制信令、仅有信令。
示例性的，在上述指示信息用于指示终端类型的情况下，该指示信息可以是定位节点，信令节点，LPHAP终端，redcap定位终端等。
其中，示例性的，上述第一注册类型或第二注册类型可以包括在该注册请求消息中的5G系统注册类型(5GS registration type)信元中。
下表1中示例了5G系统注册类型信元的取值：
表1
Figure PCTCN2022110620-appb-000001
其中，表1中，5G系统注册类型取值可以位于5G系统注册类型信元的第1个字节(octet1)的第1个比特至第3个比特中。其中，“Bits 321”用于表示该字节的第1个比特至第3个比特的比特位顺序。
示例性地，在表1中，当5G系统注册类型取值为“111”时，表明其注册类型是为了定位进行注册。当然，还可以增加更多的5G系统注册类型取值，表明其注册类型是为了定位进行注册和/或为了传输控制信令进行注册。
S802.AMF确定不建立会话。
AMF接收到该注册请求消息，获取指示信息，确定不建立会话。例如，在指示信息为指示进行定位或传输信令的情况下，或者指示信息所指示的终端类型是定位的终端，或者传输信令的终端，或者其他没有信令传输的终端，例如LPHAP终端，redcap定位终端等，的情况下，确定不建立会话。
S803.AMF向终端发送注册接受(registration accepted)消息。
该注册接受消息，用于告知终端注册被接受。
在另一个实现中，如图9所示终端向AMF发起控制面业务请求的流程示意图，该流程可以包括以下步骤：
S901.终端向AMF发送控制面业务请求(Control Plane Service Request)消息。
该控制面业务请求消息可以包括上述指示信息。该指示信息的含义可参考上述步骤S701中的描述。
示例性地，在上述指示信息用于指示进行定位的情况下，该指示信息用于指示定位业务时，该指示信息具体可以为第一控制面业务类型。或者，该指示信息可以用于指示定位。
示例性地，在上述指示信息用于指示传输信令的情况下，该指示信息用于指示信令业务时，该指示信息具体可以为第二控制面业务类型。或者，该指示信息可以用于指示仅传输控制信令、仅有控制信令、仅有信令。
示例性的，在上述指示信息用于指示终端类型的情况下，该指示信息可以是定位节点，信令节点，LPHAP终端，redcap定位终端等。
其中，示例性的，上述第一控制面业务类型或第二控制面业务类型可以包括在该控制面业务请求消息中的控制面业务类型(control plane service type)信元中。
下表2示例了控制面业务类型信元的取值：
表2
Figure PCTCN2022110620-appb-000002
其中，表2中，控制面业务类型的取值可以位于控制面业务类型信元的第1个字节(octet1)的第1个比特至第3个比特中。其中，“Bits 321”用于表示该字节的第1个比特至第3个比特的比特位顺序。
示例性地，在表2中，当控制面业务类型取值为“111”时，表明其控制面业务类型是为定位业务。当然，还可以增加更多的控制面业务类型取值，表明其控制面业务类型为定位业务或信令业务。
S902.AMF确定不建立会话。
具体地，AMF接收到该控制面业务请求消息，获取指示信息，确定不建立会话。例如，在指示信息为指示进行定位或传输信令的情况下，或者指示信息所指示的终端类型是定位的终端，或者传输信令的终端，或者其他没有信令传输的终端，例如LPHAP终端，redcap定位终端等，的情况下，确定不建立会话。
S903.AMF向终端发送控制面业务接受(Service Accept)消息。
该控制面业务接受消息，用于告知终端该控制面业务被接受。
在又一个实现中，如图10所示的终端向AMF发起业务请求的流程示意图，该流程可以包括以下步骤：
S1001.终端向AMF发送业务请求(Service Request)消息。
该业务请求消息可以包括上述指示信息。该指示信息的含义可参考上述步骤S701中的描述。
示例性地，在上述指示信息用于指示进行定位的情况下，该指示信息用于指示定位业务时，该指示信息具体可以为第一业务类型。或者，该指示信息可以用于指示定位。
示例性地，在上述指示信息用于指示传输信令的情况下，该指示信息用于指示信令业务时，该指示信息具体可以为第二业务类型。或者，该指示信息可以用于指示仅传输控制信令、仅有控制信令、仅有信令。
示例性的，在上述指示信息用于指示终端类型的情况下，该指示信息可以是定位节点，信令节点，LPHAP终端，redcap定位终端等。
其中，示例性的，上述第一业务类型或第二业务类型可以包括在该业务请求消息中的业务类型(service type)信元中。
下表3示例了业务类型信元的取值：
表3
Figure PCTCN2022110620-appb-000003
其中，表3中，业务类型的取值可以位于业务类型信元的第1个字节(octet1)的第1个比特至第4个比特中。其中，“Bits 4321”用于表示该字节的第1个比特至第4个比特的比特 位顺序。
示例性地，在表3中，当业务类型取值为“111”时，表明其业务类型是为定位业务。当然，还可以增加更多的业务类型取值，表明其业务类型为定位业务或信令业务。
S1002.AMF确定不建立会话。
具体地，AMF接收到该业务请求消息，获取指示信息，确定不建立会话。例如，在指示信息为指示进行定位或传输信令的情况下，或者指示信息所指示的终端类型是定位的终端，或者传输信令的终端，或者其他没有信令传输的终端，例如LPHAP终端，redcap定位终端等，的情况下，确定不建立会话。
S1003.AMF向终端发送业务接受消息。
该业务接受消息，用于告知终端该业务被接受。
根据本申请实施例提供的一种通信方法，终端在接入网络后，可以通知AMF本次接入的目的不是传输业务数据，从而使得AMF决策不为该终端建立会话，从而保障正常通信。该方法尤其适用于定位场景，可以节省信令资源，减少通信时延，减少对关键性能指标的影响。
如图11所示，为本申请实施例提供的又一种通信方法的流程示意图，应用于寻呼场景。该方法可以包括以下步骤：
S1101.AMF向接入网设备发送第三寻呼消息。
该步骤的具体实现可参考上述步骤S601，这里不再赘述。
S1102.接入网设备接收第三寻呼消息后，向终端发送第四寻呼消息。
该步骤的具体实现可参考上述步骤S602，这里不再赘述。
S1103.终端向接入网设备发送RRC消息，该RRC消息由上述第四寻呼消息触发。
终端接收到上述第四寻呼消息后，终端发送RRC建立请求消息/RRC恢复请求消息，该消息由上述第四寻呼消息触发。接入网设备在收到终端的RRC建立请求消息后，向终端发送RRC建立消息/RRC恢复消息。终端发送RRC建立完成消息/RRC恢复完成消息，该RRC建立完成消息/RRC恢复完成消息中包含NAS消息。该NAS消息可以是业务请求消息或控制平面业务请求消息。
关于NAS消息，包括以下三种实现方式：
一种实现为，该NAS消息为第一业务请求消息，该第一业务请求消息与上述步骤S1001中的业务请求消息相同；或者该NAS消息为第一控制面业务请求消息，该第一控制面业务请求消息与上述步骤S901中的控制平面业务请求消息相同。
另一种实现为，终端收到上述第四寻呼消息后，确定该NAS消息为第二控制面业务请求消息。AMF接收到该NAS消息，可以确定不建立会话。
还一种实现为，终端收到上述第四寻呼消息后，确定该NAS消息为第二业务请求消息。AMF接收到该NAS消息，可以确定不建立会话。
S1104.接入网设备接收RRC消息，该RRC消息包括NAS消息，以及接入网设备向AMF转发终端发送的NAS消息。
具体，接入网设备获取RRC建立完成消息中的NAS消息，并转发该NAS消息。AMF接收该NAS消息。
S1105.AMF接收该NAS消息，确定不建立会话。
若该NAS消息为业务请求消息，该业务请求消息与上述步骤S1001中的业务请求消息相同，AMF的处理与上述步骤S1002相同；若该NAS消息为第一控制平面业务请求消息，该 控制平面业务请求消息与上述步骤S901中的控制平面业务请求消息相同，AMF的处理与上述步骤S902相同。
若该NAS消息为第二控制平面业务请求消息，则AMF接收到该NAS消息，确定不建立会话。
若该NAS消息为第二业务请求消息，则AMF接收到该NAS消息，确定不建立会话。
根据本申请实施例提供的一种通信方法，网络寻呼终端，网络指示本次寻呼的目的不是传输业务数据，从而使得AMF决策不为该终端建立会话，从而可以保障正常通信。该方法尤其适用于定位场景，节省信令资源，减少通信时延，减少对关键性能指标的影响。
可以理解的是，上述实施例之间可以互相组合成新的实施例，本申请对此不作限制。
可以理解的是，为了实现上述实施例中的功能，终端、接入网设备和接入管理功能网元包括了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本申请中所公开的实施例描述的各示例的单元及方法步骤，本申请能够以硬件或硬件和计算机软件相结合的形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用场景和设计约束条件。
图12和图13为本申请实施例提供的可能的通信装置的结构示意图。这些通信装置可以用于实现上述方法实施例中终端、接入网设备和接入管理功能网元的功能，因此也能实现上述方法实施例所具备的有益效果。在本申请的实施例中，该通信装置可以是终端、接入网设备或接入管理功能网元，还可以是应用于终端、接入网设备或接入管理功能网元的模块(如芯片)。
如图12所示，通信装置1200包括处理单元1210和收发单元1220。通信装置1200用于实现上述图3～图11中所示的方法实施例中终端、接入网设备或接入管理功能网元的功能。
当通信装置1200用于实现图3所示的方法实施例中终端的功能时：收发单元1220用于执行图3所示实施例中的步骤S301中发送的功能，即向接入网设备发送指示信息，所述指示信息用于指示以下至少一项：进行定位、所述通信装置类型、或传输信令；以及所述收发单元1220还用于执行图3所示实施例中的步骤S302中接收的功能，即接收来自接入网设备的RRC消息，所述RRC消息为所述通信装置配置SRB2，以及未配置DRB。
当通信装置1200用于实现图3所示的方法实施例中接入网设备的功能时：收发单元1220用于执行图3所示实施例中的步骤S301中接收的功能，即接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；所述收发单元1220还用于执行图3所示实施例中的步骤S302中发送的功能，即向终端发送RRC消息，所述RRC消息为终端配置SRB2，以及未配置DRB。
在一种可能的实现中，在所述指示信息用于指示进行定位的情况下，所述指示信息包括以下至少一项：定位、定位信令、定位业务、或定位业务信令。在该实现中，通过上述至少一项指示信息，可以明确地指示进行定位，提高了接入网设备的处理效率。
在又一种可能的实现中，在所述指示信息用于指示所述终端类型为定位的终端的情况下，所述指示信息包括以下至少一项：定位的节点指示、或定位指示。在该实现中，根据上述指示信息，可以明确地指示该终端类型为定位的终端，从而接入网设备可以决策无需为该终端建立DRB。
在又一种可能的实现中，在所述指示信息用于指示所述终端类型为传输信令的终端的情况下，所述指示信息包括以下至少一项：信令的节点指示、或仅有信令的节点指示。在该实现中，根据上述指示信息，可以明确地指示该终端类型为传输信令的终端，从而接入网设备 可以决策无需为该终端建立DRB。
在又一种可能的实现中，在所述指示信息用于指示传输信令的情况下，所述指示信息包括以下至少一项：信令、仅有信令、或控制信令。在该实现中，通过上述至少一项指示信息，可以明确地指示进行信令传输，提高了接入网设备的处理效率。
在又一种可能的实现中，所述指示信息包括在RRC建立请求消息中，所述指示信息为建立原因；或所述指示信息包括在RRC恢复请求消息中，所述指示信息为恢复原因；或所述指示信息包括在RRC建立完成消息中；或所述指示信息包括在RRC恢复完成消息中。在该实现中，在上述任一消息中携带指示信息，可以明确地指示进行信令传输，提高了接入网设备的处理效率；且无需单独发送该指示信息，节省了信令开销。
有关上述处理单元1210和收发单元1220更详细的描述可以直接参考图3所示的方法实施例中相关描述直接得到，这里不加赘述。
当通信装置1200用于实现图6所示的方法实施例中终端的功能时：收发单元1220用于执行图6所示实施例中步骤S602中接收的功能，即接收来自接入网设备的第二寻呼消息，所述第二寻呼消息包括第二指示信息，所述第二指示信息用于指示以下至少一项：为了定位、或为了传输信令；以及所述收发单元1220还用于执行图6所示实施例中步骤S603中发送的功能，即向接入网设备发送RRC消息，所述RRC消息由所述第二寻呼消息触发。
当通信装置1200用于实现图6所示的方法实施例中接入网设备的功能时：收发单元1220用于执行图6所示实施例中步骤S601中接收的功能，即接收来自AMF网元的第一寻呼消息，所述第一寻呼消息包括第一指示信息，所述第一指示信息用于指示以下至少一项：为了定位、或为了传输信令；所述收发单元1220还用于执行图6所示实施例中步骤S602中发送的功能，即根据所述第一寻呼消息，向终端发送第二寻呼消息；以及所述收发单元1220还用于执行图6所示实施例中步骤S603中接收的功能，即接收来自终端的RRC消息，所述RRC消息由所述第二寻呼消息触发。
当通信装置1200用于实现图6所示的方法实施例中接入管理功能网元的功能时：收发单元1220用于执行图6所示实施例中步骤S601中发送的功能，即向接入网设备发送第一寻呼消息，所述第一寻呼消息包括第一指示信息，所述第一指示信息用于指示以下至少一项：为了定位、或为了传输信令；以及所述收发单元1220还用于执行图6所示实施例中步骤S604中接收的功能，即接收来自接入网设备的NAS消息，所述NAS消息由所述第一寻呼消息触发。
有关上述处理单元1210和收发单元1220更详细的描述可以直接参考图6所示的方法实施例中相关描述直接得到，这里不加赘述。
当通信装置1200用于实现图7所示的方法实施例中终端的功能时：收发单元1220用于执行图7所示实施例中步骤S701中发送的功能，即向AMF网元发送指示信息，所述指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型；以及所述收发单元1220还用于执行图7所示实施例中步骤S703中接收的功能，即接收来自AMF网元的NAS消息。
当通信装置1200用于实现图7所示的方法实施例中接入管理功能网元的功能时：收发单元1220用于执行图7所示实施例中步骤S701中接收的功能，即接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、传输信令、或终端类型；所述处理单元1210用于执行图7所示实施例中步骤S702的功能，即确定不建立会话；以及所述收发单元1220还用于执行图7所示实施例中步骤S703中发送的功能，即向终端发送NAS消息。
在一种可能的实现中，在所述指示信息用于指示进行定位的情况下，所述指示信息包括 以下至少一项：为了定位进行注册、定位、或定位业务。在该实现中，通过上述至少一项指示信息，可以明确地指示进行定位，提高了AMF的处理效率。
在又一种可能的实现中，所述指示信息包括在注册请求消息中，所述指示信息为第一注册类型；或所述指示信息包括在控制面业务请求消息中，所述指示信息为第一控制面业务类型；或所述指示信息包括在业务请求消息中，所述指示信息为第一业务类型。在该实现中，AMF接收到该注册请求消息/控制面业务请求消息/业务请求消息，获取其中的5G系统注册类型取值，当注册类型/控制面业务类型/业务类型是为了定位进行注册或者接入时，可以明确地确定不建立会话。从而可以节省信令资源，减少通信时延。
在又一种可能的实现中，在所述指示信息用于指示传输信令的情况下，所述指示信息包括以下至少一项：为了传输控制信令进行注册、仅传输控制信令、仅有控制信令、仅有信令、或信令业务。在该实现中，通过上述至少一项指示信息，可以明确地指示进行信令传输，提高了AMF的处理效率。
在又一种可能的实现中，所述指示信息包括在注册请求消息中，所述指示信息为第二注册类型；或所述指示信息包括在控制面业务请求消息中，所述指示信息为第二控制面业务类型；或所述指示信息包括在业务请求消息中，所述指示信息为第二业务类型。在该实现中，AMF接收到该注册请求消息/控制面业务请求消息/业务请求消息，获取其中的5G系统注册类型取值/控制面业务类型取值/业务类型取值，当注册类型/控制面业务类型/业务类型是为了传输控制信令进行注册或者接入时，确定不建立会话。从而可以节省信令资源，减少通信时延。
有关上述处理单元1210和收发单元1220更详细的描述可以直接参考图7所示的方法实施例中相关描述直接得到，这里不加赘述。
如图13所示，通信装置1300包括处理器1310和接口电路1320。处理器1310和接口电路1320之间相互耦合。可以理解的是，接口电路1320可以为收发器或输入输出接口。可选的，通信装置1300还可以包括存储器1330，用于存储处理器1310执行的指令或存储处理器1310运行指令所需要的输入数据或存储处理器1310运行指令后产生的数据。
当通信装置1300用于实现图3-图11所示的方法时，处理器1310用于实现上述处理单元1210的功能，接口电路1320用于实现上述收发单元1220的功能。
当上述通信装置为应用于终端的芯片时，该终端芯片实现上述方法实施例中终端的功能。该终端芯片从终端中的其它模块(如射频模块或天线)接收信息，该信息是接入网设备发送给终端的；或者，该终端芯片向终端中的其它模块(如射频模块或天线)发送信息，该信息是终端发送给接入网设备的。
当上述通信装置为应用于接入网设备的芯片时，该接入网设备芯片实现上述方法实施例中接入网设备的功能。该接入网设备芯片从接入网设备中的其它模块(如射频模块或天线)接收信息，该信息是终端发送给接入网设备的；或者，该接入网设备芯片向接入网设备中的其它模块(如射频模块或天线)发送信息，该信息是接入网设备发送给终端的。
可以理解的是，本申请的实施例中的处理器可以是中央处理单元(Central Processing Unit，CPU)，还可以是其它通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其它可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。通用处理器可以是微处理器，也可以是任何常规的处理器。
本申请的实施例中的方法步骤可以通过硬件的方式来实现，也可以由处理器执行软件指 令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器、闪存、只读存储器、可编程只读存储器、可擦除可编程只读存储器、电可擦除可编程只读存储器、寄存器、硬盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于接入网设备或终端中。当然，处理器和存储介质也可以作为分立组件存在于接入网设备或终端中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序或指令。在计算机上加载和执行所述计算机程序或指令时，全部或部分地执行本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、接入网设备、用户设备或者其它可编程装置。所述计算机程序或指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机程序或指令可以从一个网站站点、计算机、服务器或数据中心通过有线或无线方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是集成一个或多个可用介质的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，例如，软盘、硬盘、磁带；也可以是光介质，例如，数字视频光盘；还可以是半导体介质，例如，固态硬盘。
在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A，B可以是单数或者复数。在本申请的文字描述中，字符“/”，一般表示前后关联对象是一种“或”的关系；在本申请的公式中，字符“/”，表示前后关联对象是一种“相除”的关系。
可以理解的是，在本申请的实施例中涉及的各种数字编号仅为描述方便进行的区分，并不用来限制本申请的实施例的范围。上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定。

Claims (16)

  1. 一种通信方法，其特征在于，所述方法包括：
    终端向接入网设备发送指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；
    所述终端接收来自所述接入网设备的无线资源控制RRC消息，所述RRC消息为所述终端配置信令无线承载SRB2，以及未配置数据无线承载DRB。
  2. 一种通信方法，其特征在于，所述方法包括：
    接入网设备接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；
    所述接入网设备向所述终端发送无线资源控制RRC消息，所述RRC消息为终端配置信令无线承载SRB2，以及未配置数据无线承载DRB。
  3. 根据权利要求1或2所述的方法，其特征在于，在所述指示信息用于指示进行定位的情况下，所述指示信息包括以下至少一项：定位、定位信令、定位业务、或定位业务信令。
  4. 根据权利要求1或2所述的方法，其特征在于，在所述指示信息用于指示所述终端类型为定位的终端的情况下，所述指示信息包括以下至少一项：定位的节点指示、或定位指示。
  5. 根据权利要求1或2所述的方法，其特征在于，在所述指示信息用于指示所述终端类型为传输信令的终端的情况下，所述指示信息包括以下至少一项：信令的节点指示、或仅有信令的节点指示。
  6. 根据权利要求1或2所述的方法，其特征在于，在所述指示信息用于指示传输信令的情况下，所述指示信息包括以下至少一项：信令、仅有信令、或控制信令。
  7. 根据权利要求1～6中任一所述的方法，其特征在于，所述指示信息包括在RRC建立请求消息中，所述指示信息为建立原因；或
    所述指示信息包括在RRC恢复请求消息中，所述指示信息为恢复原因；或
    所述指示信息包括在RRC建立完成消息中；或
    所述指示信息包括在RRC恢复完成消息中。
  8. 一种通信装置，其特征在于，所述装置包括：收发单元；其中：
    所述收发单元，用于向接入网设备发送指示信息，所述指示信息用于指示以下至少一项：进行定位、所述通信装置类型、或传输信令；
    所述收发单元，还用于接收来自所述接入网设备的无线资源控制RRC消息，所述RRC消息为所述通信装置配置信令无线承载SRB2，以及未配置数据无线承载DRB。
  9. 一种通信装置，其特征在于，所述装置包括：收发单元；其中：
    所述收发单元，用于接收来自终端的指示信息，所述指示信息用于指示以下至少一项：进行定位、终端类型、或传输信令；
    所述收发单元，还用于向所述终端发送无线资源控制RRC消息，所述RRC消息为终端配置信令无线承载SRB2，以及未配置数据无线承载DRB。
  10. 根据权利要求8或9所述的装置，其特征在于，在所述指示信息用于指示进行定位的情况下，所述指示信息包括以下至少一项：定位、定位信令、定位业务、或定位业务信令。
  11. 根据权利要求8或9所述的装置，其特征在于，在所述指示信息用于指示所述终端类型为定位的终端的情况下，所述指示信息包括以下至少一项：定位的节点指示、定位指示。
  12. 根据权利要求8或9所述的装置，其特征在于，在所述指示信息用于指示所述终端类型为传输信令的终端的情况下，所述指示信息包括以下至少一项：信令的节点指示、仅有信令的节点指示。
  13. 根据权利要求8或9所述的装置，其特征在于，在所述指示信息用于指示传输信令的情况下，所述指示信息包括以下至少一项：信令、仅有信令、或控制信令。
  14. 根据权利要求8～13中任一所述的装置，其特征在于，所述指示信息包括在RRC建立请求消息中，所述指示信息为建立原因；或
    所述指示信息包括在RRC恢复请求消息中，所述指示信息为恢复原因；或
    所述指示信息包括在RRC建立完成消息中；或
    所述指示信息包括在RRC恢复完成消息中。
  15. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述装置之外的其它装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1、3-7任一所述的方法、或用于实现如权利要求2-7任一所述的方法。
  16. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序或指令，当所述计算机程序或指令被通信装置执行时，实现如权利要求1、3-7任一所述的方法、或实现如权利要求2-7任一所述的方法。
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