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WO2025167862A1 - Procédé et appareil de communication, ainsi que dispositif de communication - Google Patents

Procédé et appareil de communication, ainsi que dispositif de communication

Info

Publication number
WO2025167862A1
WO2025167862A1 PCT/CN2025/075668 CN2025075668W WO2025167862A1 WO 2025167862 A1 WO2025167862 A1 WO 2025167862A1 CN 2025075668 W CN2025075668 W CN 2025075668W WO 2025167862 A1 WO2025167862 A1 WO 2025167862A1
Authority
WO
WIPO (PCT)
Prior art keywords
satellite
network element
terminal
isl
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/075668
Other languages
English (en)
Chinese (zh)
Inventor
金辉
张迪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vivo Mobile Communication Co Ltd
Original Assignee
Vivo Mobile Communication Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vivo Mobile Communication Co Ltd filed Critical Vivo Mobile Communication Co Ltd
Publication of WO2025167862A1 publication Critical patent/WO2025167862A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems

Definitions

  • the present application belongs to the field of communication technology, and specifically relates to a communication method, apparatus, and communication equipment.
  • NTN non-terrestrial network
  • the communication path between two user equipment is UE1-satellite-ground station-core network-ground station-satellite-UE2. Since the satellite is far away from the ground, the communication path is long, which results in a large call delay.
  • UPF user plane function
  • UE-satellite-UE USU
  • USU terminal-satellite-terminal
  • the embodiments of the present application provide a communication method, apparatus, and communication equipment, which can solve the problem of poor communication reliability in USU communication scenarios in related technologies.
  • a communication method performed by a communication device, the method comprising:
  • the first network element determines that the first terminal and the second terminal cannot perform USU communication, the first network element performs the target operation
  • a first processing unit configured to, when a first terminal and a second terminal are performing terminal-satellite-terminal USU communication, perform a target operation if it is determined that the first terminal and the second terminal cannot perform USU communication;
  • the first terminal accesses the network through a first satellite
  • the second terminal accesses the network through a second satellite.
  • the first satellite is the same as or different from the second satellite.
  • a network side device including a processor and a communication interface, wherein the processor or the communication interface is used to: when a first terminal and a second terminal perform terminal-satellite-terminal USU communication, if a first network element determines that the first terminal and the second terminal cannot perform USU communication, the first network element performs a target operation; wherein, the first terminal accesses the network through a first satellite, and the second terminal accesses the network through a second satellite, and the first satellite is the same as or different from the second satellite.
  • a wireless communication system including: a first network element, which can be used to execute the steps of the method described in the first aspect.
  • a chip comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to run a program or instruction to implement the method described in the first aspect.
  • the first network element when a first terminal and a second terminal are performing USU communication, if a first network element determines that the first terminal and the second terminal cannot perform USU communication, the first network element performs a target operation; wherein the first terminal accesses the network via a first satellite, and the second terminal accesses the network via a second satellite, and the first satellite and the second satellite are the same as or different from each other.
  • the first network element can improve communication reliability in the USU communication scenario by determining that the first terminal and the second terminal cannot perform USU communication and performing the target operation.
  • FIG2 a is a schematic diagram of one of satellite-to-satellite communications via an ISL;
  • FIG3 is a schematic diagram of the process of establishing USU communication
  • FIG4 is a schematic diagram of a process for deploying AGW on a satellite
  • FIG5 is a schematic diagram of end-to-end communication between UE1 and UE2;
  • FIG7 is a schematic diagram of Example 1 provided in the embodiments of the present application.
  • FIG8 is a second schematic diagram of Example 1 provided in the embodiments of the present application.
  • FIG10 is a schematic diagram of Example 3 provided in the embodiments of the present application.
  • FIG11 is a schematic diagram of a changed data packet transmission path according to an embodiment of the present application.
  • FIG12 is a second schematic diagram of Example 3 provided in the embodiments of the present application.
  • FIG13a is a schematic diagram of a data packet transmission path corresponding to step 4a of FIG8 provided in an embodiment of the present application;
  • FIG13b is a schematic diagram of a data packet transmission path corresponding to step 4b of FIG8 provided in an embodiment of the present application;
  • FIG14 is a structural diagram of a communication device provided in an embodiment of the present application.
  • FIG15 is a structural diagram of a communication device provided in an embodiment of the present application.
  • FIG16 is a structural diagram of a network-side device provided in an embodiment of the present application.
  • first, second, etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by “first” and “second” are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more.
  • “or” in this application represents at least one of the connected objects. For example, “A or B” covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B.
  • the character "/" generally indicates that the objects associated before and after are in an "or” relationship.
  • indication in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication).
  • a direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent;
  • an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency Division Multiple Access
  • NR New Radio
  • 6G 6th Generation
  • FIG1 shows a block diagram of a wireless communication system applicable to embodiments of the present application.
  • the wireless communication system includes a communication device 11 and a network-side device 12 .
  • the communication device 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), a flight vehicle, a vehicle user equipment (VUE), a shipborne equipment, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (PC), an ATM or a self-service machine and other communication equipment side devices.
  • PC personal computer
  • ATM an ATM or a self-service machine and other
  • the vehicle-mounted device can also be called a vehicle-mounted communication device, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc.
  • a chip in the terminal such as a modem chip or a system-on-chip (SoC).
  • SoC system-on-chip
  • the network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (RAN) device, a radio access network function or a radio access network unit.
  • the access network device may include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc.
  • WLAN wireless local area network
  • WiFi wireless fidelity
  • the base station can be called Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, base The Basic Service Set (BSS), Extended Service Set (ESS), home Node B (HNB), home evolved Node B, transmission reception point (TRP) or other appropriate terms in the relevant field, as long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiments of the present application, only the base station in the NR system is introduced as an example, and the specific type of the base station is not limited.
  • the core network equipment may include but is not limited to at least one of the following: core network node, core network function, Mobility Management Entity (MME), Access Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (Edge Application Server Discovery Function), and so on.
  • EASDF Unified Data Management
  • UDM Unified Data Repository
  • UDR Unified Data Repository
  • HSS Home Subscriber Server
  • CNC Centralized Network Configuration
  • NRF Network Repository Function
  • NEF Network Exposure Function
  • L-NEF Binding Support Function
  • BF Application Function
  • AF Application Function
  • core network equipment in the NR system is taken as an example for introduction, and the specific type of the core network equipment is not limited. But not limited to at least one of the following: core network node, core network function, Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), and policy control function.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • UPF User Plane Function
  • the communication path between two UEs is UE1-satellite-ground station-core network (such as UPF)-ground station-satellite-UE2. Since the satellite is far away from the ground, the communication path is long and the call delay is large, affecting the user experience.
  • UE1-satellite-ground station-core network such as UPF
  • USU call can shorten the call delay between two UEs and improve the user experience.
  • FIGS. 1 and 2b show schematic diagrams of two types of satellites communicating via an ISL link, respectively.
  • the USU communication establishment process includes the following steps:
  • Step 1 UE1 establishes a Protocol Data Unit (PDU) session.
  • PDU Protocol Data Unit
  • UE1's PDU session uses the ground UPF1 as the PDU session anchor (PSA).
  • PSA PDU session anchor
  • Step 2 UE1 initiates a call request (invite) to UE2, which includes a Session Description Protocol (SDP) offer and, optionally, a Cell Global Identity (CGI) or satellite ID.
  • SDP Session Description Protocol
  • CGI Cell Global Identity
  • CGI is the globally unique identifier of the cell where the UE resides.
  • NCGI NR Cell Global Identifier
  • ECGI E-Utran Cell Global Identifier
  • Step 3 The Session Initiation Protocol (SIP) Invite is sent to UE2 through the Serving-Call Session Control Function 1 (S-CSCF1) that provides service for UE1.
  • SIP Session Initiation Protocol
  • S-CSCF1 Serving-Call Session Control Function 1
  • Step 4 UE2 replies with a 183 response message, which carries an SDP answer.
  • the 183 message is sent to the Proxy-Call Session Control Function 1 (P-CSCF1).
  • P-CSCF1 Proxy-Call Session Control Function 1
  • P-CSCF1 generates media information (media info) corresponding to the voice based on the SDP offer and SDP answer, and sends a Hypertext Transfer Protocol (HTTP) POST request message to PCF.
  • the message carries the media information and, optionally, a USU indication.
  • Step 6 PCF sends Session Management (SM) related policy modifications to SMF, optionally carrying USU indications.
  • SM Session Management
  • the SMF sends a message to the UPF3 on the satellite to establish a PSA, that is, the UPF3 on the satellite is used as PSA2, the second PSA, and the UPF1 on the ground is the first PSA.
  • the UPF3 on the satellite has two logical functions: UL CL and PSA2.
  • UL CL When a UE sends uplink data, the data passes through the base station and first reaches the UL CL. The UL CL then decides whether to send the data to PSA1 or PSA2 based on the filter rule sent by the SMF.
  • the UL CL when the UL CL receives the data packet sent by the UE, it will send it to the PSA2 on the satellite, thereby avoiding sending the data packet back to the ground and reducing call delay through USU communication.
  • Step 9 SMF updates UPF1 and establishes a connection between UPF1 and UL CL.
  • Step 10 SMF sends an N4 session establishment request (N4 session establishment Request) message or an N4 session modification request (N4 session modification Request) message to PSA2 of UPF3 on the satellite to establish or modify the bearer for transmitting voice services.
  • N4 session establishment Request N4 session establishment Request
  • N4 session modification Request N4 session modification Request
  • Step 11 SMF generates a PDU Session Modification command message to be sent to the UE and an N2 message to be sent to the base station. SMF sends the PDU Session Modification command message and N2 message to AMF.
  • Step 12 AMF sends a PDU Session Modify Command message to the UE.
  • Step 13 Continue with the subsequent PDU session modification procedure (subsequence PDU Session Modification procedure).
  • a voice bearer is established for UE2.
  • the path for this bearer is UE2 ⁇ base station 2 ⁇ UL CL ⁇ PSA2.
  • This voice bearer is a Quality of Service (QoS) flow in 5G networks and an Evolved Packet System (EPS) bearer in 4G networks, with a QoS level of 1.
  • QoS Quality of Service
  • EPS Evolved Packet System
  • Step 14 The SMF sends an SMF association modification message to the PCF to notify the PCF that the bearer for transmitting voice is successfully established.
  • Step 15 The PCF sends a notification message to the P-CSCF1 to inform the P-CSCF1 that the bearer for voice transmission is successfully established.
  • Step 16 P-CSCF1 replies a 183 message to UE1.
  • Step 17 When the user of UE2 answers the call, UE2 responds with a 200 OK.
  • the 200 OK is sent to UE1, and UE1 and UE2 begin a voice call.
  • the data packet transmission path between UE1 and UE2 is: UE1 ⁇ base station 1 ⁇ UPF3 ⁇ UPF4 ⁇ base station 2 ⁇ UE2, or: UE1 ⁇ base station 1 ⁇ UL CL1 ⁇ PSA2-1 ⁇ PSA2-2 ⁇ UL CL2 ⁇ base station 2 ⁇ UE2.
  • UE1 and UE2 implement USU communication, where data packets between UPF3 and UPF4 (or, PSA2-1 and PSA2-2) are transmitted over the ISL link between the two satellites.
  • Satellites can also deploy IP Multimedia Subsystem (IMS) Access Gateway (AGW) functionality.
  • IMS IP Multimedia Subsystem
  • AGW Access Gateway
  • This AGW is controlled by the P-CSCF to join the communication link.
  • the data packet transmission path between UE1 and UE2 is: UE1 ⁇ Base Station 1 ⁇ UPF3 ⁇ AGW1 ⁇ AGW2 ⁇ UPF4 ⁇ Base Station 2 ⁇ UE2, or: UE1 ⁇ Base Station 1 ⁇ UL CL1 ⁇ PSA2-1 ⁇ AGW1 ⁇ AGW2 ⁇ PSA2-2 ⁇ UL CL2 ⁇ Base Station 2 ⁇ UE2.
  • Data packets between AGW1 and AGW2 are transmitted over the ISL link between the two satellites.
  • base station 1 is the base station serving UE1
  • base station 2 is the base station serving UE2
  • UL CL1 is the UL CL serving UE1
  • UL CL2 is the UL CL serving UE2
  • PSA2-1 is the PSA2 serving UE1
  • PSA2-2 is the PSA2 serving UE2
  • AGW1 is the AGW serving UE1
  • AGW2 is the AGW serving UE2.
  • the process for deploying AGW on a satellite includes the following steps:
  • Step 1 P-CSCF1 receives the Invite request sent by UE (i.e., step 2 in Figure 3).
  • the SDP offer in the Invite request contains the IP address of UE1 (i.e., IP1).
  • Step 2 When P-CSCF1 detects the presence of a Network Address Translation (NAT) gateway between UE1 and P-CSCF1, P-CSCF1 requests the AGW that provides services for UE1 to allocate a transport address corresponding to IP1 to UE1.
  • NAT Network Address Translation
  • Step 3 AGW allocates the transport address corresponding to IP1 to UE1: Tr_IP1.
  • Step 4 P-CSCF1 modifies UE1's SDP offer, replacing IP1 with Tr_IP1.
  • Step 5 P-CSCF1 sends the modified SDP offer to UE2.
  • Step 6 UE2 returns an SDP answer, which contains UE2’s IP address IP2.
  • IP2 may be the IP address of UE2, or a transmission address allocated to UE2 by an AGW providing services for UE2.
  • Step 7 P-CSCF1 sends an Allocation Request message to AGW.
  • Step 8 AGW allocates the transport address corresponding to IP2 to UE2: Tr_IP2.
  • Step 9 P-CSCF1 modifies UE2's SDP answer, replacing IP2 with Tr_IP2.
  • Step 10 P-CSCF1 sends the replaced SDP answer to UE1.
  • Step 11 When UE1 receives a data packet for voice service, the destination address of the data packet is set to Tr_IP_2 contained in the SDP answer, and the data packet is routed to the AGW.
  • Step 12 The AGW modifies the destination address of the data packet to IP2 based on the correspondence between Tr_IP2 and IP2. Based on the destination address, the data packet is routed to UE2 or the AGW providing services for UE2.
  • Step 13 When UE2 receives a data packet for voice service, the destination address of the data packet is set to Tr_IP_1 contained in the SDP offer, and the data packet is routed to the AGW.
  • Step 14 The AGW modifies the destination address of the data packet to IP1 based on the correspondence between Tr_IP1 and IP1. Based on the destination address, the data packet is routed to UE1.
  • UE1 is taken as an example for description.
  • UE2 can also perform the same action, which will not be described in detail here.
  • the P-CSCF can control the addition of the AGW to the communication path between UE1 and UE2.
  • Step 1 UE1 and UE2 establish PDU sessions respectively.
  • UE1's PDU session uses the ground UPF1 as PSA
  • UE2's PDU session uses the ground UPF2 as PSA1.
  • Step 2 UE1 initiates a call request (invite) to UE2, including the SDP offer and, optionally, the CGI or satellite ID.
  • CGI is a globally unique identifier of the cell where the UE resides. When the cell is a 5G cell, it is NCGI, and when the cell is a 4G cell, it is ECGI.
  • Step 3 The SIP Invite passes through S-CSCF1 that provides services for UE1 and S-CSCF2 that provides services for UE2, and reaches P-CSCF2 that provides services for UE2.
  • Step 4 P-CSCF2 sends the Invite request to UE2.
  • Step 5 UE2 replies with a 183 response message, which carries an SDP answer.
  • the 183 message is sent to P-CSCF2.
  • Step 6 P-CSCF2 determines whether the calling and called UEs can perform USU communication based on the calling and called UE information, for example, based on CGI or satellite ID.
  • P-CSCF2 generates media information corresponding to the voice based on the SDP offer and SDP answer, and sends a message to PCF, which carries the media information and, optionally, a USU indication.
  • Step 7 PCF sends SM-related policy modifications to SMF, optionally carrying USU indication.
  • Step 8 SMF determines whether UE2 can perform USU communication. SMF can make the determination based on the USU indication sent by PCF, or SMF can make the determination itself.
  • SMF sends a message to UPF4 on the satellite, and uses UPF4 on the satellite as PSA2.
  • Step 9 SMF sends a message to UPF4 on the satellite, and uses UPF4 on the satellite as UL CL.
  • Step 10 SMF updates UPF2 and establishes a connection between UPF2 and UL CL.
  • Step 11 SMF sends a message to PSA2 of UPF4 on the satellite to establish a bearer for transmitting voice services.
  • Step 12 SMF generates a PDU session modification command message to be sent to the UE and an N2 message to be sent to the base station, and SMF sends the PDU session modification command message and N2 message to AMF.
  • Step 13 AMF sends a PDU Session Modification Command message to the UE.
  • Step 14 Continue with the subsequent process of PDU session modification.
  • a voice bearer is established for UE2.
  • the path for this bearer is UE2 ⁇ base station 2 ⁇ UL CL ⁇ PSA2.
  • the voice bearer is a QoS flow in the 5G network and an EPS bearer in the 4G network, with a QoS level of 1.
  • Step 15 The SMF sends an SMF association modification message to the PCF to notify the PCF that the bearer for transmitting voice is successfully established.
  • Step 16 The PCF sends a notification message to the P-CSCF2 to inform the P-CSCF2 that the bearer for voice transmission is successfully established.
  • Step 17 P-CSCF2 forwards the 183 message, which is routed to P-CSCF1 serving UE1.
  • Step 18 P-CSCF1 executes steps 6 to 16 to establish a bearer for UE1 for transmitting voice.
  • a bearer for transmitting voice is established for UE1, and the path of the bearer is UE1 ⁇ base station 1 ⁇ UPF3.
  • PCF and SMF used by UE1 and UE2 can be the same or different, and this application does not impose any restrictions.
  • Step 19 P-CSCF1 replies with message 183 to UE1.
  • Step 20 When the user of UE2 answers the call, UE2 responds with 200 OK.
  • embodiments of the present application provide a communication method, a communication apparatus, and a communication device to solve the problem of poor reliability of USU communication in related technologies.
  • FIG6 shows a flow chart of a communication method provided by an embodiment of the present application. As shown in FIG6 , the communication method includes the following steps:
  • Step 601 When a first terminal and a second terminal are performing USU communication, if a first network element determines that the first terminal and the second terminal cannot perform USU communication, the first network element performs a target operation;
  • the first terminal accesses the network through a first satellite
  • the second terminal accesses the network through a second satellite.
  • the first satellite is the same as or different from the second satellite.
  • failure of the first terminal and the second terminal to perform USU communication can be understood as the failure of the first terminal and the second terminal to continue to perform USU communication.
  • the subsequent understanding is the same and will not be repeated.
  • both the first terminal and the second terminal access the network via a satellite
  • USU communication can be performed between the first terminal and the second terminal.
  • the first terminal and the second terminal can access the network via the same satellite, that is, the first satellite and the second satellite are the same.
  • the first terminal and the second terminal can access the network via different satellites, that is, the first satellite and the second satellite are different.
  • the first network element performs the target operation to solve the situation where the first terminal and the second terminal cannot perform USU communication.
  • the target operation performed by the first network element can, for example, be an operation for adjusting the communication path between the first terminal and the second terminal.
  • the first network element may be a network element (or function) deployed on a satellite.
  • the first network element itself may be able to know relevant information about the satellite, and thus may be able to determine whether USU communication is possible between the first terminal and the second terminal.
  • the first network element is not deployed on the satellite, but can interact with the network element (or function) deployed on the satellite to obtain relevant information of the satellite from the first network element to determine whether USU communication is possible between the first terminal and the second terminal.
  • the target operation executed by different first network elements is also different.
  • the relevant implementation methods of the first network element executing the target operation will be described later.
  • the first network element when a first terminal and a second terminal are performing USU communication, if a first network element determines that the first terminal and the second terminal cannot perform USU communication, the first network element performs a target operation; wherein the first terminal accesses the network via a first satellite, and the second terminal accesses the network via a second satellite, and the first satellite and the second satellite are the same as or different from each other.
  • the first network element can improve communication reliability in the USU communication scenario by determining that the first terminal and the second terminal cannot perform USU communication and performing the target operation.
  • the first terminal and the second terminal cannot perform USU communication, for example, ISL is unstable, or the terminal switches from one satellite or reselects from another satellite.
  • the case where the first terminal switches or reselects from the first satellite to the third satellite applies both when the first terminal and the second terminal access the network through the same satellite and when the first terminal and the second terminal access the network through different satellites.
  • the first terminal and the second terminal are both connected to satellite 1 (i.e., the first satellite (or the second satellite)), after the first terminal switches to satellite 2 (i.e., the third satellite), there is no ISL connection between satellite 1 and satellite 2, then satellite 1 and satellite 2 cannot perform USU communication; or, although there is an ISL connection between satellite 1 and satellite 2, the ISL is unavailable.
  • satellite 1 i.e., the first satellite (or the second satellite)
  • satellite 2 i.e., the third satellite
  • the first terminal is connected to satellite 1 (i.e., the first satellite) and the second terminal is connected to satellite 2 (i.e., the second satellite)
  • satellite 3 i.e., the third satellite
  • satellite 2 and satellite 3 cannot perform USU communication; or, although there is an ISL connection between satellite 2 and satellite 3, the ISL is unavailable.
  • the following describes an implementation method for the first network element to perform the target operation.
  • the first network element is an SMF
  • the first network element performs a target operation, including at least one of the following:
  • the first network element sends a first message to the first UPF, the first message carrying first information or second information, the first information including a first filter rule, the first filter rule being used to route the data packet to a ground PSA function, and the second information being used to instruct deletion of a UL CL function and a PSA function;
  • the first network element sends a second message to the first UPF, where the second message is used to delete the voice bearer;
  • the first network element sends a third message to the second UPF, where the third message is used to establish a voice bearer;
  • the first UPF is a UPF deployed on the first satellite or the second satellite;
  • the second UPF is a UPF deployed on the ground.
  • the UL CL function of the first UPF can activate the first filtering rule. This allows data packets sent from the first terminal to the second terminal to be routed from the UL CL function of the first UPF to the PSA function on the ground, and then further routed by the PSA function on the ground to the second terminal. This shows that sending the first message carrying the first information to the first UPF via the SMF ensures voice service availability for both communicating parties.
  • the filtering rules involved in this application are used by the UL CL function to perform uplink diversion. Therefore, the filtering rules can be understood as UL CL filtering rules.
  • starting the first filtering rule can be understood or replaced as: using the first filtering rule, or replacing the currently used filtering rule with the first filtering rule, or modifying the currently used filtering rule to the first filtering rule, or updating the currently used filtering rule to the first filtering rule.
  • the first message carries the second information, indicating that the SMF has initiated a process to delete the UL Closed Loop (CL) and PSA (Personal Assistance) functions included in the first UPF.
  • the first UPF can delete the UL Closed Loop (CL) and PSA functions based on the second information. This operation can promptly free up satellite resources, thereby conserving them.
  • the first network element sends a third message to the second UPF to establish a voice bearer.
  • the first network element sends a second message to the first UPF to delete the voice bearer.
  • step of the first network element sending the first message the step of the first network element sending the second message, and the step of the first network element sending the third message is not limited.
  • establishing a voice bearer can be understood as establishing a transmission tunnel for transmitting voice services.
  • the transmission tunnel is the transmission tunnel between the UL CL and the second UPF; when the first message carries the second information, the transmission tunnel is the transmission tunnel between the base station and the second UPF.
  • the transmission tunnel can be a General Packet Radio Service (GPRS) Tunneling Protocol (GTP) tunnel.
  • GPRS General Packet Radio Service
  • GTP General Packet Radio Service Tunneling Protocol
  • the communication path between the first terminal and the second terminal can be adjusted.
  • the original path for USU communication between different satellites through ISL is adjusted to a path for communication through the ground UPF (or ground PSA).
  • the original path for USU communication within the same satellite is adjusted to a path for communication through the ground UPF (or ground PSA). Since the communication path between the first terminal and the second terminal is adjusted, the first terminal and the second terminal can continue to communicate normally, thereby improving the communication reliability in the USU communication scenario.
  • the first network element determining that the first terminal and the second terminal cannot perform USU communication includes: the first network element determining that the first ISL is unavailable;
  • the method further includes:
  • the first network element When determining that the first ISL is restored, the first network element sends third information to the first UPF, where the third information includes a second filtering rule, and the second filtering rule is used to route the data packet to the PSA function of the first UPF.
  • the SMF determines that the first ISL has been restored, the SMF can again send the second filtering rules to the first UPF, causing the UL CL to forward received data packets to the PSA function of the first UPF. This allows the first and second terminals to continue USU communication using the first ISL.
  • the following describes an implementation in which the SMF determines that the first ISL is unavailable.
  • the first network element receives fourth information from the first UPF, and determines, based on the fourth information, that the first ISL is unavailable;
  • the first network element receives fifth information from the PCF and determines, based on the fifth information, that the first ISL is unavailable.
  • the first network element may determine that the first ISL is unavailable based on fourth information sent by a first UPF deployed on the satellite, or the first network element may determine that the first ISL is unavailable based on fifth information sent by a PCF.
  • the fourth information sent by the first UPF to the SMF may be information indicating that the first ISL is unavailable. That is, after the first UPF determines that the first ISL is unavailable, it sends the information indicating that the first ISL is unavailable as the fourth information to the SMF. In this case, the SMF does not need to determine whether the first ISL is available and can directly determine that the first ISL is unavailable. Alternatively, the fourth information sent by the first UPF to the SMF is not information that directly indicates that the first ISL is unavailable. For example, the fourth information is related measurement information. That is, the SMF needs to determine whether the first ISL is available based on the fourth information to determine that the first ISL is unavailable.
  • the fifth information sent by the PCF to the SMF may be information indicating that the first ISL is unavailable. It should be noted that before the PCF sends the fifth information to the SMF, the PCF receives information indicating that the first ISL is unavailable from other network elements (such as P-CSCF).
  • the fourth information is used to indicate at least one of the following:
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the N6 interface is the interface between the first UPF and the external network.
  • the SMF does not need to determine whether the first ISL is available by itself, and can directly determine that the first ISL is unavailable.
  • the SMF needs to determine whether the first ISL is available.
  • the amount of cached uplink service data can be used to measure the transmission quality of the first ISL. For example, a larger amount of cached uplink service data indicates that the transmission quality of the first ISL is poor.
  • Whether the uplink service is abandoned can be used to measure the transmission quality of the first ISL. For example, if the uplink service is abandoned, it indicates that the transmission quality of the first ISL is poor.
  • the service parameters of the N6 interface may be, for example, parameters related to delay, jitter, or a transmission period, and the parameters may be used to measure the transmission quality of the first ISL.
  • the QoS parameters of the voice bearer may be parameters related to delay, bandwidth, etc., for example, and the parameters may be used to measure the transmission quality of the first ISL.
  • the first UPF can collect at least one of the last four items to determine whether the first ISL is available, and then send the fourth information to the SMF if it is determined that the first ISL is unavailable; or, the first UPF obtains the information that the first ISL is unavailable from other network elements (such as AGW deployed on a satellite), and then sends the fourth information to the SMF.
  • the first UPF can collect at least one of the last four items to determine whether the first ISL is available, and then send the fourth information to the SMF if it is determined that the first ISL is unavailable; or, the first UPF obtains the information that the first ISL is unavailable from other network elements (such as AGW deployed on a satellite), and then sends the fourth information to the SMF.
  • the fifth information is used to indicate at least one of the following:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the method further comprises:
  • the first network element sends sixth information to the first UPF, where the sixth information is used to indicate at least one of the following:
  • the sixth information sent by the SMF to the first UPF can be understood as information used to indicate the reporting conditions or reporting trigger events of the fourth information, that is, the first UPF reports the fourth information to the SMF according to the reporting instructions of the SMF.
  • the first UPF upon determining the first ISL interruption or upon obtaining indication information indicating the first ISL interruption, reports the fourth information indicating the first ISL interruption to the SMF.
  • the sixth information is used to indicate reporting the service parameter measurement results of the N6 interface to the SMF
  • the first UPF upon obtaining the service parameter measurement results of the N6 interface, reports the fourth information indicating the service parameter measurement results of the N6 interface to the SMF. The rest are similar and are not described in detail here.
  • the sixth information is carried through a session reporting rule (Session Reporting Rule, SRR) parameter.
  • Session Reporting Rule SRR
  • the SRR parameter further carries at least one of a voice bearer identifier and a packet detection rule (PDR) for the voice bearer.
  • the sixth information corresponds to the voice bearer, or the sixth information corresponds to the PDR for the voice bearer.
  • the following provides relevant implementation methods for the UPF to determine that the first terminal and the second terminal are unable to communicate with the USU and perform the target operation.
  • the first network element is a UPF deployed on the first satellite or the second satellite;
  • the first network element performs a target operation, including:
  • the PSA function of the first network element notifies the UL CL function of the first network element to start a first filtering rule, and the first filtering rule is used to route the data packet to the PSA function on the ground.
  • starting the first filtering rule can be understood or replaced by: using the first filtering rule, or modifying the currently used filtering rule to the first filtering rule, or replacing the currently used filtering rule with the first filtering rule, or updating the currently used filtering rule to the first filtering rule.
  • the UPF on the satellite can also perform some corresponding operations under the instruction of the SMF, including the operation of activating the first filtering rule.
  • the operation of the UPF on the satellite to activate the first filtering rule is performed based on the instruction of the SMF.
  • the UPF on the satellite performs the target operation, which can be understood as the UPF on the satellite automatically performing (or actively performing) the target operation when determining that the first terminal and the second terminal cannot perform USU communication. That is, in this embodiment, the UPF on the satellite performs the target operation independently of the SMF's determination that the first terminal and the second terminal cannot perform USU communication, and independently of the SMF's execution of the corresponding target operation.
  • the UPF on the satellite performs the target operation, which can be replaced by the PSA function of the UPF on the satellite performing the target operation. The subsequent details will not be repeated.
  • the method further comprises:
  • the UL CL function of the first network element receives a first message from the SMF, and the first message carries first information and second information.
  • the first information is used to indicate the first filtering rule
  • the second information is used to indicate the second filtering rule.
  • the second filtering rule is used to route the data packet to the PSA function of the first network element.
  • the SMF sends two filtering rules to the UL CL function of the UPF on the satellite.
  • the second filtering rule applies to situations where USU communication can be performed normally, while the first filtering rule applies to situations where USU communication cannot be performed.
  • the UL CL activates the second filtering rule.
  • the original path for packets sent by UE1 is from the UL CL to the satellite's PSA. If the ISL is unavailable, packets sent along this path will not reach UE2.
  • the UL CL activates the first filtering rule, allowing packets sent by UE1 to be routed from the UL CL to the terrestrial PSA, which is then routed to UE2, ensuring voice service availability for both communicating parties.
  • the following describes an implementation in which the UPF on the satellite determines that the first ISL is unavailable.
  • the first network element determining that the first terminal and the second terminal cannot perform USU communication includes: the first network element determining that the first ISL is unavailable;
  • the first network element determines that the first ISL is unavailable, including at least one of the following:
  • the first network element detects a target parameter and determines, based on the target parameter, that the first ISL is unavailable;
  • the first network element receives seventh information from the first AGW, and determines, based on the seventh information, that the first ISL is unavailable;
  • the first AGW is an AGW deployed on the first satellite or the second satellite;
  • the target parameter includes at least one of the following:
  • this implementation is also applicable to the aforementioned embodiment in which the SMF determines that the first terminal and the second terminal are unable to perform USU communication and performs the target operation.
  • the first ISL is unavailable
  • the first ISL is abnormal
  • the P-CSCF in this embodiment can be the P-CSCF serving the first terminal or the P-CSCF serving the second terminal. If the P-CSCF serving the first terminal and the P-CSCF serving the second terminal are the same P-CSCF, then the P-CSCF in this embodiment serves both the first terminal and the second terminal.
  • the P-CSCF determines that USU communication between the first and second terminals is unavailable, it can send an allocation request message to a ground-based AGW (i.e., a second AGW).
  • a ground-based AGW i.e., a second AGW.
  • the second AGW can reallocate a destination IP address or destination transport address for the target terminal and notify the P-CSCF of the reallocated IP address or transport address.
  • the P-CSCF then sends the reallocated IP address or transport address to the target terminal.
  • the target terminal can then transmit subsequent data packets based on the IP address or transport address reallocated by the second AGW.
  • the destination address of UE1's data packet is changed from Tr_IP2 (the IP address of the AGW on the satellite) to new Tr_IP2 (the IP address of the AGW on the ground).
  • Tr_IP2 the IP address of the AGW on the satellite
  • Tr_IP2 the IP address of the AGW on the ground
  • the first network element determining that the first terminal and the second terminal cannot perform USU communication includes: the first network element determining that the first ISL is unavailable;
  • the method further comprises:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the P-CSCF determines that the first ISL is unavailable, it can send an indication message to the PCF indicating that the first ISL is unavailable.
  • the SMF determines that the first terminal and the second terminal cannot communicate with each other under the USU and performs the target operation. To avoid repetition, this is not described in detail.
  • the P-CSCF or SMF may unilaterally determine that the first terminal and the second terminal are unable to perform USU communication and unilaterally perform the corresponding target operation.
  • the P-CSCF may unilaterally determine that the first terminal and the second terminal are unable to perform USU communication and perform the target operation, and the SMF may continue to use the mechanism of the relevant technology; or, the SMF may unilaterally determine that the first terminal and the second terminal are unable to perform USU communication and perform the target operation, and the P-CSCF may continue to use the mechanism of the relevant technology.
  • the P-CSCF and SMF determine from multiple perspectives that the first terminal and the second terminal are unable to communicate under the USU, and each performs a corresponding target operation. For example, the P-CSCF first determines that the first terminal and the second terminal are unable to communicate under the USU, and performs a corresponding target operation. The P-CSCF then sends an eighth message to the PCF, and the PCF sends a fifth message to the SMF (see the aforementioned description of the embodiment in which the SMF determines that the first terminal and the second terminal are unable to communicate under the USU and performs a target operation). Based on the fifth message, the SMF determines that the first terminal and the second terminal are unable to communicate under the USU, and performs a corresponding target operation. A specific embodiment will be provided later to illustrate this situation.
  • the following describes an implementation in which the P-CSCF determines that the first ISL is unavailable.
  • the first network element determining that the first ISL is unavailable includes:
  • the first network element receives ninth information from the first AGW
  • the first network element determines, based on the ninth information, that the first ISL is unavailable;
  • the first AGW is an AGW deployed on the first satellite or the second satellite.
  • the ninth information is used to indicate at least one of the following:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the AGW deployed on the satellite i.e., the first AGW
  • the first AGW can provide indication information indicating that the first ISL is unavailable.
  • the AGW deployed on the satellite detects that the first ISL is unavailable, it can either send the seventh information to the UPF so that the UPF can perform the corresponding target operation, or the UPF continues to report the indication information of the unavailability of the first ISL to the SMF (i.e., the UPF sends the fourth information to the SMF), and the SMF performs the corresponding target operation; or it can send the ninth information to the P-CSCF so that the P-CSCF can perform the corresponding target operation.
  • the first network element sends tenth information to the first AGW, where the tenth information is used to indicate at least one of the following:
  • the tenth information sent by the P-CSCF to the first AGW can be understood as information for indicating the reporting condition or reporting trigger event of the ninth information, that is, the first AGW reports the ninth information to the P-CSCF according to the reporting instruction of the P-CSCF.
  • the tenth information is carried by a fourth message, and the fourth message is used to request allocation of an IP address or a transport address for the target terminal.
  • the P-CSCF when the P-CSCF requests the first AGW to allocate a transport address corresponding to the destination IP address to the UE, the tenth information may be carried.
  • the first network element (i.e., P-CSCF) determining that the first terminal and the second terminal cannot perform USU communication includes: the first network element determining that there is no ISL between the third satellite and the second satellite, or the first network element determining that the ISL between the third satellite and the second satellite is unavailable, or the first network element determining that the third satellite and the second satellite cannot communicate;
  • the first network element determines that there is no ISL between the third satellite and the second satellite, or the first network element determines that the ISL between the third satellite and the second satellite is unavailable, or the third satellite and the second satellite cannot communicate, including at least one of the following:
  • the first network element determines, based on the fifth message from the first terminal, information about the third satellite, and determines, based on the information about the third satellite, that there is no ISL between the third satellite and the second satellite, or that the ISL between the third satellite and the second satellite is unavailable, or that communication between the third satellite and the second satellite is impossible; the fifth message is used to perform SIP renegotiation or SDP renegotiation;
  • the first network element determines, based on information about a third satellite from the PCF, that there is no ISL between the third satellite and the second satellite;
  • the CGI of the third satellite is the CGI of the third satellite.
  • the solution for the P-CSCF to determine that the first terminal and the second terminal cannot perform USU communication may include any of the following solutions.
  • Solution 1 After the UE switches to a new satellite, it initiates a SIP re-invite.
  • the P-CSCF obtains the UE's satellite ID based on the SIP re-invite (for example, the UE directly carries it in the SIP re-invite, or the P-CSCF obtains it from the PCF).
  • Solution 2 The PCF sends changes based on the UE's access network information and proactively notifies the P-CSCF.
  • the P-CSCF triggers the UE to send a SIP re-Invite.
  • the P-CSCF directly initiates a SIP re-Invite to the UE.
  • the first network element determines, based on the fifth message from the first terminal, the information of the third satellite, including at least one of the following:
  • the fifth message includes information about the third satellite, and the first network element obtains the information about the third satellite from the fifth message;
  • the first network element obtains the information of the third satellite from the PCF according to the fifth message.
  • the first network element sends a sixth message to the first terminal, where the sixth message is used to respond to the fifth message, and the sixth message includes an IP address or a transport address allocated by the first AGW to the target terminal;
  • the first network element sends a seventh message to the first terminal, where the seventh message is used to trigger or instruct the first terminal to send the fifth message;
  • the first network element sends an eighth message to the first terminal, where the eighth message is used to perform SIP re-negotiation or SDP re-negotiation with the first terminal, and the eighth message includes an IP address or a transport address allocated by the first AGW to the target terminal.
  • the following embodiments uniformly represent the second UPF deployed on the ground as UPF1, the PSA function on the ground as PSA1, the first UPF deployed on the satellite as UPF3, and the PSA included in the first UPF as PSA2.
  • the first network element is SMF.
  • Step 10 The SMF sends an indication to the UPF3 or the PSA2 function of the UPF3 on the satellite.
  • the indication is used to indicate a condition or event for sending a report to the SMF.
  • the indication is used to indicate at least one of the following:
  • the N6 interface (the interface between the UPF and the external network (e.g., IMS network, Internet network)) is interrupted;
  • the indication information may be carried by an SRR parameter.
  • the indication information corresponds to a voice bearer, or the indication information corresponds to a PDR of a voice bearer.
  • An ISL link is interrupted.
  • the N6 interface is interrupted
  • N6 service parameter measurement control information delay, jitter, transmission cycle, etc.
  • Step 1b AGW1 sends an instruction message to UPF3.
  • the instruction message is used to indicate one of the following:
  • Step 2 UPF sends a report to SMF, which contains the information determined in step 1a, or the indication information in step 1b.
  • Step 3 Based on the report from UPF3, SMF determines that the ISL link is unavailable.
  • the determination method is as follows:
  • the SMF can directly determine that the ISL link is unavailable based on the reported information.
  • the SMF makes a judgment based on the reported information, for example, a comprehensive judgment based on information reported multiple times.
  • Step 4a SMF sends the UL CL filter rule to the UL CL function of UPF3, which is used for UL CL to send the received data packet to UPF1 (i.e. PSA1, the UPF selected when establishing the PDU session).
  • UPF1 i.e. PSA1, the UPF selected when establishing the PDU session.
  • Step 4b SMF initiates the process of deleting UL CL and PSA2 corresponding to UPF3.
  • Step 4a modifies the uplink data path of the UL CL, and step 4b deletes the UL CL and PSA2.
  • the technical effect of step 4a is that when the ISL is restored, USU communication can be quickly restored.
  • the technical effect of step 4b is that when the ISL is unavailable, satellite resources can be promptly released, saving satellite resources.
  • the second filter rule is used to send the data packet to the PSA1 function of UPF1.
  • PSA2 When the PSA2 function of UPF3 detects that the ISL is unavailable, PSA2 notifies the UL CL, and the UL CL starts the second filter rule so that the data packets sent by UE1 can be routed from the UL CL to the PSA1 on the ground.
  • ISL unavailability includes the following situations: ISL link disconnection, ISL link abnormality, N6 interface disconnection, or N6 interface abnormality.
  • the same operation can also be performed on the UE2 side, that is, the data packets of UE2 can also be routed to the PSA1 on the ground. To avoid repetition, this will not be described in detail.
  • the above process shows that the original path for UE1's data packets is from the UL CL to the satellite's PSA2.
  • the data packets cannot be delivered to UE2.
  • the UL CL activates the second filter rule, the data packets can be routed from the UL CL to the terrestrial PSA1, which then routes them to UE2, ensuring voice service availability for both parties.
  • Example 3 P-CSCF controls the connection between AGW1 and the ground server
  • Step 7 When P-CSCF1 requests to allocate the transport address (Tr_IP2) corresponding to IP2 for the UE, it carries indication information, which is used to indicate the condition or event (event) for sending a report to P-CSCF1.
  • the indication information includes at least one of the following:
  • Step 11 The AGW determines that the reporting conditions are met.
  • the reporting conditions include at least one of the following:
  • ISL measurement control information delay, jitter, transmission cycle, etc.
  • Step 13 Based on the AGW report, P-CSCF1 determines that the ISL link is unavailable.
  • the determination method is as follows:
  • P-CSCF1 makes a judgment based on the reported information, for example, a comprehensive judgment based on information reported multiple times.
  • Step 14 P-CSCF1 sends an allocation request to the AGW (New AGW) deployed on the ground.
  • AGW New AGW
  • Step 15 The AGW deployed on the ground allocates the transmission address corresponding to IP2 to the UE: new Tr_IP2.
  • Step 16 P-CSCF1 sends SDP offer to UE1 via SIP re-Invite message, which carries new Tr_IP2
  • Step 17 UE1 responds with SDP answer.
  • Steps 14 to 17 are used to notify the UE that the destination address of the uplink data packet is new Tr_IP2.
  • Steps 14 to 17 can be replaced by the following steps:
  • P-CSCF1 sends a message to UE to trigger UE1 to perform SDP re-negotiation
  • the UE performs SDP re-negotiation via the re-Invite message, carrying the same content as in step 1;
  • step 3 P-CSCF1 executes subsequent steps according to step 2 to step 10. The difference is that in step 2, step 3, step 7 and step 8, P-CSCF1 communicates with the ground AGW (New AGW).
  • ground AGW New AGW
  • Tr_IP2 the IP address of the satellite AGW
  • Tr_IP2 the IP address of the ground AGW
  • UE2 will also perform the same action as UE1, so the changed data packet transmission path is shown in FIG11 .
  • P-CSCF1 determines that the ISL is unavailable, it processes the UPF on the satellite.
  • Step 1 in FIG12 corresponds to step 13 in FIG10 .
  • Step 2 P-CSCF1 sends an indication message to the PCF, where the indication message indicates at least one of the following:
  • Step 3 The PCF sends an indication message to the SMF, where the indication message indicates at least one of the following:
  • the instruction information in step 2 and the instruction information in step 3 may be the same or different.
  • Step 4 The SMF executes according to step 4a or 4b in Figure 8.
  • step 4a or step 4b subsequent voice services need to be transmitted through UPF1, so the voice bearer needs to be established on UPF1.
  • Step 5 SMF initiates a message to UPF1 to establish a bearer for transmitting voice services.
  • SMF initiates a message to UPF1 to delete the bearer used to transmit voice services on UPF3.
  • steps 2 to 4 in FIG. 12 and steps 14 to 16 in FIG. 10 are not performed in any particular order, and steps 4 and 5 in FIG. 12 are not performed in any particular order.
  • Figure 13a corresponding to step 4a in Figure 8
  • Figure 13b corresponding to step 4b in Figure 8
  • the shortened data packet transmission paths in Figures 13a and 13b can reduce the use of UPF resources on the satellite, allowing the satellite to serve more users.
  • the first network element can improve the communication reliability in the USU communication scenario by determining that the first terminal and the second terminal cannot perform USU communication and by performing the target operation.
  • the embodiments of the present application are applicable to LTE and NR communication systems, as well as subsequent evolved communication systems.
  • the communication method provided in the embodiment of the present application can be executed by a communication device.
  • the communication device provided in the embodiment of the present application is described by taking the communication method executed by the communication device as an example.
  • the communication device 1000 includes:
  • the first processing unit 1001 is configured to, when a first terminal and a second terminal are performing terminal-satellite-terminal USU communication, perform a target operation if it is determined that the first terminal and the second terminal cannot perform USU communication;
  • the first terminal accesses the network through a first satellite
  • the second terminal accesses the network through a second satellite.
  • the first satellite is the same as or different from the second satellite.
  • the device further comprises:
  • a second processing unit configured to determine that the first terminal and the second terminal cannot perform USU communication
  • the second processing unit is specifically configured to:
  • first terminal and the second terminal perform USU communication via a first intersatellite link (ISL)
  • ISL intersatellite link
  • the first terminal switches from the first satellite or reselects to a third satellite, it is determined that there is no ISL between the third satellite and the second satellite, or the first network element determines that the ISL between the third satellite and the second satellite is unavailable, or the first network element determines that the third satellite and the second satellite cannot communicate.
  • the first network element is a session management function SMF;
  • the first processing unit 1001 is specifically configured to:
  • UPF user plane function
  • PSA terrestrial protocol data unit session anchor
  • the first UPF is a UPF deployed on the first satellite or the second satellite;
  • the second UPF is a UPF deployed on the ground.
  • the second processing unit is specifically configured to: determine that the first ISL is unavailable;
  • the device further comprises:
  • the third processing unit is configured to send third information to the first UPF when it is determined that the first ISL is restored, where the third information includes a second filtering rule, and the second filtering rule is used to route the data packet to the PSA function of the first UPF.
  • the second processing unit is specifically configured to perform at least one of the following:
  • the method further comprises receiving fifth information from a policy control function (PCF), and determining, based on the fifth information, that the first ISL is unavailable.
  • PCF policy control function
  • the fourth information is used to indicate at least one of the following:
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the N6 interface is the interface between the first UPF and the external network.
  • the fifth information is used to indicate at least one of the following:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the device further comprises:
  • the sixth information is carried through a session reporting rule SRR parameter.
  • the SRR parameter further carries at least one of an identifier of a voice bearer and a packet detection rule PDR of the voice bearer.
  • the first network element is a UPF deployed on the first satellite or the second satellite;
  • the UL CL function of the first network element is notified through the PSA function of the first network element to start a first filtering rule, and the first filtering rule is used to route the data packet to the PSA function on the ground.
  • the device further comprises:
  • the fourth processing unit is used to receive a first message from the SMF through the UL CL function of the first network element, where the first message carries first information and second information, where the first information is used to indicate the first filtering rule, and the second information is used to indicate the second filtering rule, where the second filtering rule is used to route the data packet to the PSA function of the first network element.
  • the second processing unit is specifically configured to perform at least one of the following:
  • the first AGW is an AGW deployed on the first satellite or the second satellite;
  • the target parameter includes at least one of the following:
  • the seventh information is used to indicate at least one of the following:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the first network element is a proxy call session control function P-CSCF;
  • the first processing unit 1001 is specifically configured to:
  • the second AGW is an AGW deployed on the ground
  • the target terminal is a terminal located at the first satellite or the second satellite.
  • the second processing unit is specifically configured to: determine that the first ISL is unavailable;
  • the device further comprises:
  • the fifth processing unit is configured to send eighth information to the policy control function PCF, where the eighth information is used to indicate at least one of the following:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the second processing unit is specifically configured to:
  • the first AGW is an AGW deployed on the first satellite or the second satellite.
  • the ninth information is used to indicate at least one of the following:
  • the first ISL is unavailable
  • the first ISL is interrupted
  • the first ISL is abnormal
  • the device further comprises:
  • the sixth processing unit is configured to send tenth information to the first AGW, where the tenth information is used to indicate at least one of the following:
  • the tenth information is carried by a fourth message, and the fourth message is used to request allocation of an IP address or a transport address for the target terminal.
  • the second processing unit is specifically configured to perform at least one of the following:
  • the fifth message being used for performing Session Initiation Protocol (SIP) renegotiation or Session Description Protocol (SDP) renegotiation;
  • SIP Session Initiation Protocol
  • SDP Session Description Protocol
  • the information of the third satellite includes at least one of the following:
  • the cell global identifier CGI of the third satellite is the cell global identifier CGI of the third satellite.
  • the second processing unit is further configured to perform at least one of the following:
  • the fifth message includes the information of the third satellite, and the information of the third satellite is obtained from the fifth message;
  • the information of the third satellite is obtained from the PCF.
  • the apparatus further includes a seventh processing unit, configured to perform at least one of the following:
  • An eighth message is sent to the first terminal, where the eighth message is used to perform SIP re-negotiation or SDP re-negotiation with the first terminal, and the eighth message includes an IP address or a transport address allocated by the first AGW to the target terminal.
  • the communication reliability in the USU communication scenario can be improved.
  • the communication device in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip.
  • the electronic device can be a communication device, or it can be other devices other than a communication device.
  • the communication device can include but is not limited to the types of communication devices 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.
  • the communication device provided in the embodiment of the present application can implement the various processes implemented in the method embodiments of Figures 6 to 12 and achieve the same technical effects. To avoid repetition, they will not be described here.
  • an embodiment of the present application further provides a communication device 1100, including a processor 1101 and a memory 1102.
  • the memory 1102 stores a program or instruction that can be run on the processor 1101.
  • the communication device 1100 is a communication device
  • the program or instruction, when executed by the processor 1101 implements the various steps of the above-mentioned communication device side method embodiment and can achieve the same technical effect.
  • the communication device 1100 is a network side device
  • the program or instruction, when executed by the processor 1101 implements the various steps of the above-mentioned network side device side method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
  • the present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps in the method embodiments shown in Figures 6 to 12.
  • This network-side device embodiment corresponds to the first network element-side method embodiment described above, and each implementation process and implementation method of the above method embodiment are applicable to this network-side device embodiment and can achieve the same technical effects.
  • an embodiment of the present application further provides a network-side device.
  • the network-side device 1300 includes a processor 1301, a network interface 1302, and a memory 1303.
  • the network interface 1302 is, for example, a common public radio interface (CPRI).
  • CPRI common public radio interface
  • the network side device 1300 of the embodiment of the present application also includes: instructions or programs stored in the memory 1303 and executable on the processor 1301.
  • the processor 1301 calls the instructions or programs in the memory 1303 to execute the methods executed by the modules shown in FIG14 and achieve the same technical effect. To avoid repetition, it will not be elaborated here.
  • An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored.
  • a program or instruction is stored.
  • the various processes of the above-mentioned communication method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.
  • the processor is the processor in the communication device described in the above embodiment.
  • the readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.
  • ROM computer read-only memory
  • RAM random access memory
  • magnetic disk such as a hard disk, a hard disk, or an optical disk.
  • optical disk such as a hard disk, a hard disk, or an optical disk.
  • the readable storage medium may be a non-transitory readable storage medium.
  • An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned communication method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
  • the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.
  • An embodiment of the present application further provides a computer program/program product, which is stored in a storage medium.
  • the computer program/program product is executed by at least one processor to implement the various processes of the above-mentioned communication method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
  • An embodiment of the present application further provides a communication system, including: a first network element, which can be used to execute the steps of the communication method described above.
  • the computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for causing a communication device or a network-side device to execute the methods described in each embodiment of the present application.
  • a storage medium such as ROM, RAM, magnetic disk, optical disk, etc.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande se rapporte au domaine technique des communications. L'invention divulgue un procédé et un appareil de communication, ainsi qu'un dispositif de communication. Le procédé de communication dans les modes de réalisation de la présente demande comprend : lorsqu'un premier équipement utilisateur et un second équipement utilisateur réalisent une communication équipement utilisateur-satellite-équipement d'utilisateur (USU), si un premier élément de réseau détermine que le premier équipement utilisateur et le second équipement utilisateur ne peuvent pas effectuer une communication USU, le premier élément de réseau exécute une opération cible, le premier équipement utilisateur accédant à un réseau au moyen d'un premier satellite, le second équipement utilisateur accédant au réseau au moyen d'un second satellite, et le premier satellite étant identique ou différent du second satellite.
PCT/CN2025/075668 2024-02-07 2025-02-05 Procédé et appareil de communication, ainsi que dispositif de communication Pending WO2025167862A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202410175301.1 2024-02-07
CN202410175301.1A CN120454808A (zh) 2024-02-07 2024-02-07 通信的方法、装置及通信设备

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WO2025167862A1 true WO2025167862A1 (fr) 2025-08-14

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CN (1) CN120454808A (fr)
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101001101A (zh) * 2007-01-10 2007-07-18 北京航空航天大学 移动卫星网中的星地链路切换方法
US20080045146A1 (en) * 2006-01-18 2008-02-21 Per Wahlberg Systems and methods for establishing modular and flexible satellite communications networks
US20200029265A1 (en) * 2018-07-23 2020-01-23 Hughes Network Systems, Llc Hitless Satellite-to-Satellite Handovers Using a Phased Array Antenna
CN114024594A (zh) * 2021-11-09 2022-02-08 北京中科晶上科技股份有限公司 卫星通信系统的通信方法和装置
CN116886153A (zh) * 2023-07-06 2023-10-13 中国电信股份有限公司技术创新中心 卫星切换方法、通信方法、系统、装置、设备和介质
CN117278091A (zh) * 2022-06-14 2023-12-22 华为技术有限公司 一种星间链路构建方法及通信装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080045146A1 (en) * 2006-01-18 2008-02-21 Per Wahlberg Systems and methods for establishing modular and flexible satellite communications networks
CN101001101A (zh) * 2007-01-10 2007-07-18 北京航空航天大学 移动卫星网中的星地链路切换方法
US20200029265A1 (en) * 2018-07-23 2020-01-23 Hughes Network Systems, Llc Hitless Satellite-to-Satellite Handovers Using a Phased Array Antenna
CN114024594A (zh) * 2021-11-09 2022-02-08 北京中科晶上科技股份有限公司 卫星通信系统的通信方法和装置
CN117278091A (zh) * 2022-06-14 2023-12-22 华为技术有限公司 一种星间链路构建方法及通信装置
CN116886153A (zh) * 2023-07-06 2023-10-13 中国电信股份有限公司技术创新中心 卫星切换方法、通信方法、系统、装置、设备和介质

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