WO2023206549A1 - 一种中继通信方法、通信装置及通信设备 - Google Patents

一种中继通信方法、通信装置及通信设备 Download PDF

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Publication number
WO2023206549A1
WO2023206549A1 PCT/CN2022/090702 CN2022090702W WO2023206549A1 WO 2023206549 A1 WO2023206549 A1 WO 2023206549A1 CN 2022090702 W CN2022090702 W CN 2022090702W WO 2023206549 A1 WO2023206549 A1 WO 2023206549A1
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Prior art keywords
discovery
relay
terminal
relay terminal
remote terminal
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PCT/CN2022/090702
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English (en)
French (fr)
Inventor
王鑫丽
沈洋
Original Assignee
北京小米移动软件有限公司
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 北京小米移动软件有限公司 filed Critical 北京小米移动软件有限公司
Priority to PCT/CN2022/090702 priority Critical patent/WO2023206549A1/zh
Priority to CN202280001325.4A priority patent/CN117322059A/zh
Publication of WO2023206549A1 publication Critical patent/WO2023206549A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point

Definitions

  • the present disclosure relates to the field of wireless communication technology, and in particular, to a relay communication method, communication device and communication equipment.
  • terminals that support proximity based services can not only communicate directly with the network, but also communicate with the network through other terminals.
  • a relay terminal can serve as a relay for a remote terminal, allowing the remote terminal to communicate with the network through the relay terminal.
  • 5G ProSe UE-to-Network Relay 5G ProSe UE-to-Network Relay
  • the remote terminal in the registered state can receive downlink information from the network through the relay terminal.
  • the remote terminal in the registered state can receive downlink information from the network through the relay terminal.
  • how to transmit downlink information to them is an urgent problem that needs to be solved.
  • the present disclosure provides a relay communication method, communication device and communication equipment to realize the transmission of downlink information to remote terminals outside the coverage range.
  • a relay communication method which method can be applied to core network equipment in a communication system, such as access and mobility management function (AMF) equipment.
  • the method may include: the core network device receives a service message, the service message is used to indicate the first service of the remote terminal; the core network device determines that the remote terminal is outside the coverage according to the service message; the core network device sends a message to at least one relay terminal Send a discovery request message, which is used to request the discovery of the remote terminal.
  • AMF access and mobility management function
  • the discovery request message carries a discovery reason, and the discovery reason is used to indicate the first service.
  • the above method further includes: the core network device receiving a first discovery notification message from a first relay terminal among at least one relay terminal, the first discovery notification message being used to notify the first relay terminal The remote terminal was successfully discovered.
  • the above method further includes: the core network device sending a release notification message to a second relay terminal in at least one relay terminal according to the first discovery notification message, where the release notification message is used to indicate the second relay terminal.
  • the relay terminal stops discovering the remote terminal, and the second relay terminal is different from the first relay terminal.
  • the service message is a downlink data notification message
  • the downlink data notification message is used to notify the remote terminal that downlink data is unreachable.
  • the method before the core network device sends a discovery request message to at least one relay terminal, the method further includes: the core network device determines at least one relay terminal according to the latest context of the remote terminal.
  • a relay communication method which method can be applied to a relay terminal device in a communication system.
  • the above method includes: the first relay terminal receives a discovery request message from the core network device, the discovery request message is sent by the core network device when it determines that the remote terminal is outside the coverage range, and the discovery message is used to request the discovery of the remote terminal; A relay terminal sends a discovery notification message to the remote terminal according to the discovery request message.
  • the discovery request message carries a discovery reason, and the discovery reason is used to indicate the first service of the remote terminal.
  • the above method further includes: the first relay terminal determines the relay service code of the first service according to the discovery reason.
  • the above method further includes: the first relay terminal determines that the remote terminal is successfully discovered; the first relay terminal sends a discovery notification message to the core network device. Send a first discovery notification message.
  • the first relay terminal determines that the remote terminal is successfully discovered, including: the first relay terminal receives a direct connection communication request message from the remote terminal; the first relay terminal responds to the direct connection communication request message. , confirm that the remote terminal is successfully discovered.
  • the first relay terminal successfully discovers the remote terminal according to the determination, and the above method further includes: the first relay terminal establishes unicast direct communication with the remote terminal, and the unicast direct communication is used to transmit the third Downstream information of a business.
  • a communication device can be a core network device in a communication system or a chip or an on-chip system in the core network device. It can also be used in the core network device to implement the above embodiments.
  • the communication device can realize the functions performed by the core network equipment in the above embodiments, and these functions can be realized by hardware executing corresponding software. These hardware or software include one or more modules corresponding to the above functions.
  • the device may include: a receiving module, used to receive a service message, the service message being used to indicate the first service of the remote terminal; a processing module, used to determine that the remote terminal is outside the coverage according to the service message; a sending module, used to A discovery request message is sent to at least one relay terminal, where the discovery request message is used to request discovery of the remote terminal.
  • the discovery request message carries a discovery reason, and the discovery reason is used to indicate the first service.
  • the receiving module is also configured to receive a first discovery notification message from a first relay terminal in at least one relay terminal, where the first discovery notification message is used to notify the first relay terminal of successful discovery. remote terminal.
  • the sending module is further configured to send a release notification message to a second relay terminal of at least one relay terminal according to the first discovery notification message, where the release notification message is used to indicate to the second relay terminal Stop discovering the remote terminal, and the second relay terminal is different from the first relay terminal.
  • the service message is a downlink data notification message
  • the downlink data notification message is used to notify the remote terminal that downlink data is unreachable.
  • the processing module is also configured to determine at least one relay terminal according to the latest context of the remote terminal before the sending module sends the discovery request message to the at least one relay terminal.
  • a communication device may be a first relay terminal device in a communication system or a chip or system-on-chip in the first relay terminal device. It may also be a first relay terminal.
  • the communication device can realize the functions performed by the first relay terminal equipment in the above embodiments, and these functions can be realized by hardware executing corresponding software. These hardware or software include one or more modules corresponding to the above functions.
  • the device may include: a receiving module, configured to receive a discovery request message from the core network device.
  • the discovery request message is sent by the core network device when it determines that the remote terminal is outside the coverage range.
  • the discovery message is used to request discovery of the remote terminal;
  • the sending module is used to send the discovery notification message to the remote terminal according to the discovery request message.
  • the discovery request message carries a discovery reason, and the discovery reason is used to indicate the first service of the remote terminal.
  • the above device further includes: a processing module, configured to determine the relay service code of the first service according to the discovery reason.
  • the above device further includes: a processing module, configured to determine that the remote terminal has been successfully discovered after the sending module sends a discovery notification message to the remote terminal; and a sending module, further configured to send a third message to the core network device. A notification message is found.
  • the receiving module is configured to receive a direct communication request message from the remote terminal; the processing module is specifically configured to determine that the remote terminal is successfully discovered according to the direct communication request message.
  • a communication device such as a core network device, including: a memory and a processor; the processor is connected to the memory and is configured to execute computer-executable instructions stored on the memory to implement the above The relay communication method described in the first aspect and any possible implementation manner thereof.
  • a communication device such as a relay terminal, including: a memory and a processor; the processor is connected to the memory and is configured to execute computer-executable instructions stored on the memory to implement the above The relay communication method described in the second aspect and any possible implementation manner thereof.
  • a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium; when the instructions are run on a computer, they are used to perform the above-mentioned first to second aspects and any possible method thereof.
  • a computer program or computer program product is provided.
  • the computer program product When executed on a computer, the computer implements the method described in the first to second aspects and any possible implementation manner thereof. follow the communication method.
  • the core network device determines that the remote terminal is outside the coverage area and triggers the discovery procedure of the remote terminal so that the remote terminal can communicate with the remote terminal after being discovered.
  • the relay terminal establishes direct communication and then transmits downlink information (forward the DL traffic) to the remote terminal outside the coverage area. Furthermore, since downlink information can be transmitted to remote terminals outside the coverage area, the remote terminal does not need to maintain the registration status through frequent registration updates, reducing unnecessary signaling overhead and power consumption.
  • Figure 1 is a schematic diagram of a communication system in an embodiment of the present disclosure
  • Figure 2 is a schematic diagram of a 5G system architecture in the present disclosure
  • Figure 3 is a schematic flowchart of the implementation of the first relay communication method in an embodiment of the present disclosure
  • Figure 4 is a schematic flowchart of the implementation of the second communication method in the embodiment of the present disclosure.
  • Figure 5 is a schematic flowchart of the implementation of the relay communication method on the first core network side in an embodiment of the present disclosure
  • Figure 6 is a schematic flowchart of the implementation of the relay communication method on the first relay UE side in an embodiment of the present disclosure
  • Figure 7 is a schematic structural diagram of a communication device in an embodiment of the present disclosure.
  • Figure 8 is a schematic structural diagram of a communication device in an embodiment of the present disclosure.
  • Figure 9 is a schematic structural diagram of a relay terminal in an embodiment of the present disclosure.
  • Figure 10 is a schematic structural diagram of a core network device in an embodiment of the present disclosure.
  • first, second, third, etc. may be used to describe various information in the embodiments of the present disclosure, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the embodiments of the present disclosure, “first information” may also be called “second information”, and similarly, “second information” may also be called “first information”. Depending on the context, the word “if” as used herein may be interpreted as “when” or “when” or “in response to determining.”
  • 5G ProSe terminal use equipment, UE
  • 5G ProSe UE-to-Network Relay 5G ProSe terminal (use equipment, UE) to network relay (5G ProSe UE-to-Network Relay) technology
  • 5G ProSe UE-to-Network Relay 5G ProSe terminal (use equipment, UE) to network relay (5G ProSe UE-to-Network Relay) technology
  • 5G (fifth generation mobile communication technology) network to provide relay functions to support 5G ProSe remote UE Internet connection.
  • Embodiments of the present disclosure provide a communication system.
  • the communication system may be a communication system based on cellular mobile communication technology, such as a 5G (fifth generation mobile communication technology) system.
  • Figure 1 is a schematic diagram of a communication system in an embodiment of the present disclosure.
  • the communication system 100 may include: a remote UE 101 and a UE-to-Network Relay. 102.
  • DN data network
  • the terminal-to-network relay (UE-to-Network Relay) 102 can be implemented by relaying UE
  • the access network 103 can be implemented by access network equipment.
  • FIG. 2 is a schematic diagram of a 5G system architecture in the present disclosure.
  • the 5G access network may include a next generation radio access network (NG RAN).
  • the access network device may be a device used by the access network side to support terminal access to the wireless communication system.
  • it can be the next generation base station (next generation NodeB, gNB), transmission reception point (TRP), relay node (relay node), access point (AP) in the 5G access technology communication system )wait.
  • next generation NodeB next generation NodeB, gNB
  • TRP transmission reception point
  • relay node relay node
  • AP access point
  • the 5G core network can include: access and mobility management function (AMF) equipment, session management function (SMF) equipment, user plane function (UPF) equipment, etc. .
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • the AMF device has access and mobility management functions, mainly performing mobility management, access authentication/authorization and other functions.
  • the SMF device has a session management function, which mainly performs session management, UPF selection, UE Internet Protocol (IP) address allocation and other functions.
  • session management function which mainly performs session management, UPF selection, UE Internet Protocol (IP) address allocation and other functions.
  • the UPF device is a user plane functional device. It serves as an interface with the data network and completes functions such as user plane data forwarding, session/flow-level accounting statistics, and bandwidth limitation.
  • the above-mentioned remote UE and relay UE can be a terminal with wireless communication function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); and Can be deployed in the air (such as aircraft, balloons and satellites, etc.).
  • the above-mentioned terminals can be mobile phones, tablets (Pad), computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial control) ), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety Terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the terminal may also be a handheld device with wireless communication capabilities, a vehicle-mounted device, a wearable device, a computing device, or other processing device connected to a wireless modem, etc.
  • Terminal devices can be called different names in different networks, for example: terminal device, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication Equipment, user agent or user device, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), 5G Network or terminals in future evolution networks, etc.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • the remote UE is ProSe UE.
  • PC5 The interface between the remote UE and the relay UE.
  • Uu The interface between the relay UE and NGRAN.
  • N6 The interface between 5GC and DN.
  • N4 The interface between SMF and UPF. It is used to transfer information between the control plane and the user plane, including controlling the distribution of forwarding rules, QoS control rules, traffic statistics rules, etc. for the user plane and reporting of user plane information.
  • N11 The interface between SMF and AMF, used to transfer PDU session tunnel information between RAN and UPF, transfer control messages sent to UE, transfer radio resource control information sent to RAN, etc.
  • N2 The interface between AMF and RAN, used to transmit wireless bearer control information from the core network side to the RAN.
  • 5GC can also include: network function (NF), such as application function (AF) equipment.
  • NF network function
  • AF devices may refer to devices that provide various services at the application layer.
  • the AF device may be an internal application of the operator (such as an AF device for voice services) or a third-party AF device (such as a video server or a game server).
  • the AF device may also have other situations, which are not specifically limited in the embodiments of the present disclosure.
  • each device is only exemplary, and not all functions of each device are necessary when used in the embodiments of the present disclosure. All or part of the equipment of the core network may be physical equipment or virtualized equipment, which is not limited here. Of course, the communication system in the embodiment of the present disclosure may also include other devices not shown in Figure 1, which are not limited here.
  • the relay UE can serve as a relay for the remote UE, so that the remote UE can communicate with the network through the relay UE, such as receiving downlink data from the network. information.
  • the remote UE may be out of coverage (OOC). At this time, how to transmit downlink information to the remote UE is an urgent problem that needs to be solved.
  • embodiments of the present disclosure provide a relay communication method, which can be applied to the above communication system.
  • the access network device may be a base station in the 5G network, such as gNB.
  • the core network equipment can be 5G core network equipment, such as AMF equipment, SMF equipment, UPF equipment, etc.
  • AMF equipment such as AMF equipment, SMF equipment, UPF equipment, etc.
  • SMF equipment such as SMF equipment
  • UPF equipment such as AMF equipment
  • the access network equipment can also be the evolution of gNB, and the core network equipment can also be the evolution of AMF equipment, SMF equipment, UPF equipment, etc.
  • the embodiments of this disclosure do not specifically limit this. .
  • FIG 3 is a schematic flowchart of the implementation of the first relay communication method in an embodiment of the present disclosure.
  • the communication method may include:
  • the AMF device receives the service message.
  • the service message is used to indicate the first service of the remote UE.
  • the first service can be understood as the downlink service of the remote UE, such as downlink data transmission service, positioning service triggered by AF or other NF in 5GC, etc.
  • the service message can be a message corresponding to the downlink service, such as a data notification message from UPF, a location request message from AF, etc.
  • the downlink information of the first service may be downlink data of the remote UE, positioning control information of the remote UE, etc.
  • the first service, the service message, and the downlink information of the first service can also be in other situations, and Tracy does not make specific limitations in the embodiment of this disclosure.
  • S301 may be: the AMF device receives a data notification sent by the UPF device; or, if the first service is a positioning service, S301 may be: the AMF device receives a data notification sent by the AF device. positioning request message.
  • the UPF device when the UPF device receives the first downlink data packet from the remote UE, it determines that there is no N3 tunnel for downlink transmission with the remote UE. At this time, the downlink data of the remote UE is unreachable. Then, the UPF device sends data notification to the SMF device to notify the remote UE that the downlink data is unreachable. The SMF device sends data notification to the AMF device to trigger the discovery process of the remote UE.
  • the AF device triggers the positioning service, and the AF device sends a location request to the AMF device to trigger the discovery process of the remote UE.
  • the above communication system can also use other methods to trigger the discovery process of the remote UE, which is not specifically limited in the embodiments of the present disclosure.
  • the service message may carry identification information of the remote UE to indicate the remote UE to the AMF device.
  • the identification information of the remote UE may be a general public user identity (generic public subscription identifier, GPSI), user permanent identity (subscription permanent identifier, SUPI), etc.
  • the AMF device determines that the remote UE is outside the coverage according to the service message.
  • the AMF device can determine whether the remote UE is outside the coverage according to the context of the remote UE, the location information reported by the remote UE, etc. For example, when the context of the remote UE does not exist in the AMF device or only part of the context exists, the AMF device determines that the remote UE is outside the coverage. Alternatively, the AMF device determines the movement trajectory of the remote UE based on the location information reported periodically by the remote UE or the location information reported triggered by leaving the cell, and then determines whether the remote UE is outside the coverage area. Of course, the AMF can also determine whether the remote UE is outside the coverage through other methods, which are not specifically limited in this embodiment of the disclosure.
  • the AMF device may also determine at least one relay UE based on the latest context of the remote UE.
  • at least one relay UE may be understood as a candidate relay UE that provides relay for the remote UE.
  • the candidate relay UE can establish a packet data unit (packet data unit, PDU) session for relaying for any relay service code (RSC).
  • PDU packet data unit
  • RSC relay service code
  • the AMF device sends a discovery request message (discovery request) to the candidate relay UE to request discovery of the remote UE, thereby triggering the discovery process of the remote UE.
  • the discovery request message may carry a discovery cause, and the discovery cause is used to indicate the first service.
  • the discovery reason can be downlink data transmission, positioning request, etc.
  • the AMF device triggers the discovery process of the remote UE.
  • S304 The candidate relay UE initiates the discovery process of the remote UE according to the discovery request message.
  • the candidate relay UE after receiving the discovery request message sent by the AMF device, the candidate relay UE sends a discovery announcement message (discovery announcement) to the remote UE to initiate the discovery process of the remote UE. It should be noted that the discovery notification information does not need to carry the discovery reason.
  • the remote UE receives the discovery notification message sent from one or more relay UEs among the candidate relay UEs, and selects one from the one or more relay UEs as the relay service providing UE (i.e., the first The relay UE can also be described as the target relay UE). Then, the remote UE sends a direct communication request message, such as a unicast direct communication request message (unicast direct communication request), to the selected first relay UE to request to establish a direct connection on the PC5 interface with the first relay UE. communication. After receiving the direct communication request message sent by the remote UE, the first relay UE confirms that it has successfully discovered the remote UE.
  • a direct communication request message such as a unicast direct communication request message (unicast direct communication request)
  • the remote UE may determine the first relay UE based on its own performance parameters, processing capabilities, and channel quality between the remote UE and the one or more relay UEs.
  • the remote UE may also select the first relay UE based on other factors, which is not specifically limited in the embodiments of the present disclosure.
  • S305 The first relay UE determines that the remote UE is successfully discovered.
  • the first relay UE can confirm that the remote UE has been successfully discovered, and then send a discovery notification message (discovery notification) to the AMF device.
  • the first relay UE sends the first discovery notification message to the AMF device.
  • the first discovery notification message is used to notify the AMF device that the first relay UE has successfully discovered the remote UE.
  • the AMF device determines that the first relay UE successfully discovered the remote UE according to the first discovery notification message.
  • the AMF device determines that the first relay UE successfully discovered the remote UE, and then,
  • the AMF device requests the SMF device to establish a PDU session for the relay for the first relay UE.
  • the AMF device may also send a release notification message (release notification) to the second relay UE based on the first discovery notification message.
  • release notification is used to instruct the second relay UE to stop discovering the remote UE.
  • the second relay UE may refer to other relay UEs among the above candidate relay UEs except the first relay UE.
  • the first relay UE establishes a PDU session for the first service relay.
  • the above discovery reason may be carried by the AMF device in the discovery request message and delivered to the candidate relay UE through S303.
  • the first relay UE can determine the relay service code for the first service based on the discovery reason, and then establish a PDU session based on the relay service code of the first service.
  • the first relay UE when the first relay UE performs S308, if there is no PDU session associated with the relay service code of the first service or a new PDU session is required for relaying, the first relay UE communicates with the remote end Before the UE completes the establishment of the direct communication connection on the PC5 interface, it initiates a new PDU session establishment process. On the contrary, if there is a PDU session associated with the relay service code of the first service, the first relay UE can continue to use the PDU session to provide relay services for the remote UE.
  • the first relay UE relays the downlink information of the first service to the remote UE.
  • relay UE1 It is assumed that there are relay UE1, relay UE2 and relay UE3 in the communication system.
  • the UPF device When the UPF device receives the first downlink data packet from the remote UE, but there is no N3 tunnel for downlink data transmission, the UPF device sends a data notification to the AMF device through the SMF device, thereby triggering the following communication process.
  • FIG. 4 is a schematic flowchart of the implementation of the second communication method in the embodiment of the present disclosure.
  • the communication process may include:
  • the UPF device sends data notification to the SMF device;
  • the SMF device sends data notification to the AMF device
  • the AMF device determines that the remote UE is outside the coverage and determines the candidate relay UE;
  • the candidate relay UEs may include relay UE1, relay UE2, and relay UE3.
  • the AMF device sends discovery request to relay UE1, relay UE2 and relay UE3;
  • discovery request can carry discovery cause.
  • relay UE1, relay UE2 and relay UE3 respectively send discovery announcement to the remote UE;
  • the remote UE receives the discovery announcement sent by relay UE1 and relay UE2, and selects UE1 as the target relay UE.
  • the remote UE sends a unicast direct communication request to the relay UE1;
  • the relay UE1 determines that the remote UE has been successfully discovered.
  • the relay UE1 sends discovery notification to the AMF device
  • the AMF device receives the discovery notification from UE1.
  • the AMF device sends a session establishment request to the SMF device;
  • S409 can also be executed.
  • the AMF device sends a release notification to the relay UE2 and the relay UE3 to instruct the relay UE2 and the relay UE3 to release the discovery process of the remote UE.
  • the SMF device establishes a PDU session for the first service relay for the relay UE1;
  • the SMF device sends session establishment response to the relay UE1.
  • the relay UE1 sends a unicast direct communication response to the remote UE.
  • the relay UE1 establishes unicast direct communication with the remote UE.
  • the relay UE1 relays the downlink data from the UPF device to the remote UE.
  • the AMF device determines that the remote UE is outside the coverage and triggers the discovery process of the remote UE, so that the remote UE can communicate with the relay UE after being discovered. Establish direct connection communication, and then the relay UE relays downlink information (forward the DL traffic) to the remote UE outside the coverage range. Furthermore, since downlink information can be relayed to remote UEs outside the coverage area, the remote UE does not need to maintain the registration status through frequent registration updates, reducing unnecessary signaling overhead and power consumption.
  • embodiments of the present disclosure provide a relay communication method, which can be applied to core network equipment, such as AMF equipment, in the above communication system.
  • Figure 5 is a schematic flowchart of the implementation of the relay communication method on the first core network side in an embodiment of the present disclosure. Referring to Figure 5, the method may include:
  • the AMF device receives the service message
  • the service message is used to indicate the first service of the remote UE.
  • the service message is a downlink data notification message
  • the downlink data notification message is used to notify the remote UE that downlink data is unreachable.
  • the AMF device determines that the remote UE is outside the coverage according to the service message
  • the above method may further include: the AMF device determines at least one relay UE according to the latest context of the remote UE.
  • the AMF device sends a discovery request message to at least one relay UE.
  • the discovery request message is used to request discovery of the remote UE.
  • the discovery request message may carry a discovery reason to indicate the first service.
  • the above method further includes: the AMF device receiving a first discovery notification message from the first relay UE among the at least one relay UE to notify the first relay UE that the remote UE has successfully discovered the remote UE. End UE.
  • the above method further includes: the AMF device sends a release notification message to the second relay UE in the at least one relay UE according to the first discovery notification message, and the release notification The message is used to instruct the second relay UE to stop discovering the remote UE, and the second relay UE is different from the first relay UE.
  • embodiments of the present disclosure provide a relay communication method, which can be applied to the first relay UE in the above communication system.
  • Figure 6 is a schematic flowchart of the implementation of the relay communication method on the first relay UE side in an embodiment of the present disclosure. Referring to Figure 6, the method may include:
  • the first relay UE receives the discovery request message from the AMF device;
  • the discovery request message is sent by the AMF device when it determines that the remote UE is outside the coverage range, and the discovery message is used to request the discovery of the remote UE;
  • the first relay UE sends a discovery notification message to the remote UE according to the discovery request message.
  • the discovery request message may carry a discovery reason to indicate the first service of the remote UE.
  • the above method further includes: the first relay UE determines the relay service code of the first service according to the discovery reason.
  • the above method further includes: the first relay UE determines that the remote UE is successfully discovered; and the first relay UE sends a first discovery notification message to the AMF device.
  • the first relay UE determines that the remote UE has been successfully discovered, including: the first relay UE receives a direct communication request message from the remote UE; the first relay UE responds to the direct communication request message. , confirm that the remote UE is successfully discovered.
  • the above method further includes: the first relay UE establishes unicast direct communication with the remote UE, and the unicast direct communication is used for Transmit the downlink information of the first service.
  • FIG. 7 is a schematic structural diagram of a communication device in an embodiment of the present disclosure.
  • the communication device 700 may include: a receiving module 701, processing module 702 and sending module 703.
  • the communication device 700 can be a core network device in a communication system or a chip or system-on-chip in the core network device. It can also be a core network device used to implement the methods described in the above embodiments. function module.
  • the communication device can realize the functions performed by the core network equipment in the above embodiments, and these functions can be realized by hardware executing corresponding software. These hardware or software include one or more modules corresponding to the above functions.
  • the receiving module 701 is used to receive the service message, and the service message is used to indicate the first service of the remote terminal; the processing module 702 is used to determine that the remote terminal is outside the coverage according to the service message; the sending module 703 is used to A discovery request message is sent to at least one relay terminal, where the discovery request message is used to request discovery of the remote terminal.
  • the discovery request message carries a discovery reason, and the discovery reason is used to indicate the first service.
  • the receiving module 701 is also configured to receive a first discovery notification message from a first relay terminal among at least one relay terminal, where the first discovery notification message is used to notify the first relay terminal of success. Discover the remote terminal.
  • the sending module 703 is also configured to send a release notification message to a second relay terminal of at least one relay terminal according to the first discovery notification message, where the release notification message is used to indicate that the second relay terminal The terminal stops discovering the remote terminal, and the second relay terminal is different from the first relay terminal.
  • the service message is a downlink data notification message
  • the downlink data notification message is used to notify the remote terminal that downlink data is unreachable.
  • the processing module 702 is also configured to determine at least one relay terminal according to the latest context of the remote terminal before the sending module sends the discovery request message to the at least one relay terminal.
  • the communication device 700 can also be the first relay terminal equipment in the communication system or a chip or system-on-chip in the first relay terminal equipment. It can also be the first relay terminal equipment used in the first relay terminal equipment.
  • the communication device can realize the functions performed by the first relay terminal equipment in the above embodiments, and these functions can be realized by hardware executing corresponding software. These hardware or software include one or more modules corresponding to the above functions.
  • the receiving module 701 is used to receive a discovery request message from the core network device.
  • the discovery request message is sent by the core network device when it determines that the remote terminal is outside the coverage range.
  • the discovery message is used to request the discovery of the remote terminal; the sending module 703, used to send a discovery notification message to the remote terminal according to the discovery request message.
  • the discovery request message carries a discovery reason, and the discovery reason is used to indicate the first service of the remote terminal.
  • the processing module 702 is configured to determine the relay service code of the first service according to the discovery reason.
  • the processing module 702 is configured to determine that the remote terminal is successfully discovered after the sending module sends the discovery notification message to the remote terminal; the sending module 703 is also configured to send the first discovery notification to the core network device. information.
  • the receiving module 701 is configured to receive a direct communication request message from the remote terminal; the processing module is specifically configured to determine that the remote terminal is successfully discovered according to the direct communication request message.
  • the receiving module 701 mentioned in the embodiment of the present disclosure may be a receiving interface, a receiving circuit or a receiver, etc.; the sending module 703 may be a sending interface, a sending circuit or a transmitter, etc.; and the processing module 702 may be one or more processors.
  • FIG. 8 is a schematic structural diagram of a communication device in an embodiment of the present disclosure.
  • the communication device 800 uses general computer hardware, including a processor 801, a memory 802, a bus 803, an input device 804 and an output device.
  • memory 802 may include computer storage media in the form of volatile and/or non-volatile memory, such as read-only memory and/or random access memory.
  • Memory 802 may store an operating system, application programs, other program modules, executable code, program data, user data, and the like.
  • Input device 804 may be used to input commands and information to a communication device, such as a keyboard or pointing device such as a mouse, trackball, touch pad, microphone, joystick, game pad, satellite television antenna, scanner, or similar device. These input devices may be connected to processor 801 via bus 803 .
  • the output device 805 can be used for communication devices to output information.
  • the output device 805 can also be other peripheral output devices, such as speakers and/or printing devices. These output devices can also be connected to the processor 801 through the bus 803. .
  • the communication device may be connected to a network through the antenna 806, such as a local area network (LAN).
  • LAN local area network
  • computer execution instructions stored in the control device can be stored in remote storage devices, and are not limited to local storage.
  • the communication device executes the relay communication method on the UE side or the network device side in the above embodiments.
  • the specific execution process refer to the above embodiments. , which will not be described in detail here.
  • the above-mentioned memory 802 stores computer execution instructions for realizing the functions of the receiving module 701, the processing module 702 and the sending module 703 in FIG. 7 .
  • the functions/implementation processes of the receiving module 701, the processing module 702 and the sending module 703 in Figure 7 can all be implemented by the processor 801 in Figure 8 calling the computer execution instructions stored in the memory 802.
  • the processor 801 in Figure 8 calling the computer execution instructions stored in the memory 802.
  • the relay terminal can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.
  • FIG 9 is a schematic structural diagram of a relay terminal in an embodiment of the present disclosure.
  • the relay terminal 900 may include one or more of the following components: a processing component 901, a memory 902, a power supply component 903, and a multimedia component. 904. Audio component 905, input/output (I/O) interface 906, sensor component 907 and communication component 908.
  • I/O input/output
  • the processing component 901 generally controls the overall operations of the relay terminal 900, such as operations associated with display, phone calls, data communications, camera operations, and recording operations.
  • the processing component 901 may include one or more processors 910 to execute instructions to complete all or part of the steps of the above method. Additionally, processing component 901 may include one or more modules that facilitate interaction between processing component 901 and other components. For example, processing component 901 may include a multimedia module to facilitate interaction between multimedia component 904 and processing component 901.
  • the memory 902 is configured to store various types of data to support operations at the relay terminal 900. Examples of such data include instructions for any application or method operating on the relay terminal 900, contact data, phonebook data, messages, pictures, videos, etc.
  • Memory 902 may be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EEPROM), Programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read-only memory
  • EEPROM erasable programmable read-only memory
  • EPROM Programmable read-only memory
  • PROM programmable read-only memory
  • ROM read-only memory
  • magnetic memory flash memory, magnetic or optical disk.
  • the power supply component 903 provides power to various components of the relay terminal 900.
  • Power supply component 903 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to relay terminal 900.
  • Multimedia component 904 includes a screen that provides an output interface between relay terminal 900 and the user.
  • the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user.
  • the touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. A touch sensor can not only sense the boundaries of a touch or swipe action, but also detect the duration and pressure associated with the touch or swipe action.
  • multimedia component 904 includes a front-facing camera and/or a rear-facing camera.
  • the front camera and/or the rear camera may receive external multimedia data.
  • Each front-facing camera and rear-facing camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.
  • Audio component 905 is configured to output and/or input audio signals.
  • the audio component 905 includes a microphone (MIC) configured to receive external audio signals when the relay terminal 900 is in operating modes, such as call mode, recording mode, and voice recognition mode.
  • the received audio signals may be further stored in memory 902 or sent via communications component 908 .
  • audio component 905 also includes a speaker for outputting audio signals.
  • the I/O interface 906 provides an interface between the processing component 901 and a peripheral interface module.
  • the peripheral interface module may be a keyboard, a click wheel, a button, etc. These buttons may include, but are not limited to: Home button, Volume buttons, Start button, and Lock button.
  • Sensor component 907 includes one or more sensors for providing various aspects of status assessment for relay terminal 900 .
  • the sensor component 907 can detect the open/closed state of the relay terminal 900, the relative positioning of components, such as the display and keypad of the relay terminal 900, and the sensor component 907 can also detect the relay terminal 900 or the relay terminal.
  • the position of a component changes, the presence or absence of user contact with the relay terminal 900 , the orientation or acceleration/deceleration of the relay terminal 900 and the temperature change of the relay terminal 900 .
  • Sensor assembly 907 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact.
  • Sensor assembly 907 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor component 907 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • the communication component 908 is configured to facilitate wired or wireless communication between the relay terminal 900 and other devices.
  • the relay terminal 900 can access a wireless network based on a communication standard, such as Wi-Fi, 2G or 3G, or a combination thereof.
  • the communication component 908 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel.
  • communications component 908 also includes a near field communications (NFC) module to facilitate short-range communications.
  • NFC near field communications
  • the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra-wideband
  • Bluetooth Bluetooth
  • relay terminal 900 may be configured by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field Programmable gate array (FPGA), controller, microcontroller, microprocessor or other electronic components are implemented for performing the above method.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGA field Programmable gate array
  • controller microcontroller, microprocessor or other electronic components are implemented for performing the above method.
  • embodiments of the present disclosure provide a communication device, such as a core network device, which is consistent with the AMF device in one or more of the above embodiments.
  • FIG 10 is a schematic structural diagram of a core network device in an embodiment of the present disclosure.
  • the core network device 1000 may include a processing component 1001, which further includes one or more processors, and is represented by a memory 1002
  • An application program stored in memory 1002 may include one or more modules, each of which corresponds to a set of instructions.
  • the processing component 1001 is configured to execute instructions to perform any of the foregoing methods applied to the core network device.
  • Core network device 1000 may also include a power supply component 1003 configured to perform power management of core network device 1000, a wired or wireless network interface 1004 configured to connect core network device 1000 to the network, and an input/output (I/O ) interface 1005.
  • the core network device 1000 may operate based on an operating system stored in the memory 1002, such as Windows Server TM, Mac OS X TM, Unix TM, Linux TM, FreeBSD TM or similar.
  • embodiments of the present disclosure also provide a computer-readable storage medium. Instructions are stored in the computer-readable storage medium; when the instructions are run on the computer, they are used to execute the core of one or more of the above embodiments. Relay communication method on the network equipment side or relay terminal side.
  • embodiments of the present disclosure also provide a computer program or computer program product.
  • the computer program product When the computer program product is executed on a computer, the computer implements the core network device side or relay in one or more of the above embodiments. Relay communication method on the terminal side.

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Abstract

本公开实施例提供了一种中继通信方法、通信装置及通信设备。该通信方法可以应用5G终端到网络中继(UE-to-Network Relay)技术中。该方法可以包括：核心网设备接收业务消息，业务消息用于指示远程终端的第一业务；核心网设备确定远程终端处于覆盖范围外；核心网设备向至少一个中继终端发送发现请求消息，发现请求消息用于请求发现远程终端。在本公开中，核心网设备确定远端终端处于覆盖范围之外，并触发远端终端的发现过程，使得远端终端在被发现后能够与中继终端建立直连通信，进而向覆盖范围外的远端终端传输下行信息。

Description

一种中继通信方法、通信装置及通信设备 技术领域
本公开涉及无线通信技术领域，尤其涉及一种中继通信方法、通信装置及通信设备。
背景技术
在第五代移动网络(5th generation mobile networks，5G)技术中，支持近邻服务(proximity based services，ProSe)的终端除了可以直接与网络通信之外，还可以通过其他终端与网络通信。例如，在公共安全业务(public safety services)或者商业业务(commercial services)中，中继(relay)终端可以作为远端(remote)终端的中继，使得远端终端能够通过中继终端与网络进行通信，这种技术称为5G ProSe终端到网络中继(5G ProSe UE-to-Network Relay)技术。
目前，在这种技术下，处于注册状态的远端终端可以通过中继终端接收来自网络下行信息。但是，对于覆盖范围外的远端终端来说，如何向其传输下行信息是一个亟待解决的问题。
发明内容
本公开提供了一种中继通信方法、通信装置及通信设备，以实现向覆盖范围外的远端终端传输下行信息。
根据本公开的第一方面提供一种中继通信方法，该方法可以应用于通信系统中的核心网设备，如接入与移动性管理功能(access and mobility management function，AMF)设备。该方法可以包括：核心网设备接收业务消息，业务消息用于指示远端终端的第一业务；核心网设备根据业务消息，确定远端终端处于覆盖范围外；核心网设备向至少一个中继终端发送发现请求消息，发现请求消息用于请求发现远端终端。
在一些可能的实施方式中，发现请求消息中携带有发现原因，发现原因用于指示第一业务。
在一些可能的实施方式中，上述方法还包括：核心网设备接收来自至少一个中继终端中的第一中继终端的第一发现通知消息，第一发现通知消息用于通知第一中继终端成功发现远端终端。
在一些可能的实施方式中，上述方法还包括：核心网设备根据第一发现通知消息，向至少一个中继终端中的第二中继终端发送释放通知消息，释放通知消息用于指示第二中继终端停止发现远端终端，第二中继终端与第一中继终端不同。
在一些可能的实施方式中，业务消息为下行数据通知消息，下行数据通知消息用于通知远端终端的下行数据不可达。
在一些可能的实施方式中，在核心网设备向至少一个中继终端发送发现请求消息之前，方法还包括：核心网设备根据远端终端的最新上下文，确定至少一个中继终端。
根据本公开的第二方面提供一种中继通信方法，该方法可以应用于该方法可以应用于通信系统中的 中继终端设备。上述方法包括：第一中继终端接收来自核心网设备的发现请求消息，发现请求消息为核心网设备在确定远端终端在覆盖范围外时发送的，发现消息用于请求发现远端终端；第一中继终端根据发现请求消息，向远端终端发送发现通告消息。
在一些可能的实施方式中，发现请求消息中携带有发现原因，发现原因用于指示远端终端的第一业务。
在一些可能的实施方式中，上述方法还包括：第一中继终端根据发现原因，确定第一业务的中继业务码。
在一些可能的实施方式中，在第一中继终端向远端终端发送发现通告消息之后，上述方法还包括：第一中继终端确定成功发现远端终端；第一中继终端向核心网设备发送第一发现通知消息。
在一些可能的实施方式中，第一中继终端确定成功发现远端终端，包括：第一中继终端接收来自远端终端的直连通信请求消息；第一中继终端根据直连通信请求消息，确定成功发现远端终端。
在一些可能的实施方式中，第一中继终端根据确定成功发现远端终端，上述方法还包括：第一中继终端与远端终端建立单播直连通信，单播直连通信用于传输第一业务的下行信息。
根据本公开的第三方面提供一种通信装置，该通信装置可以为通信系统中的核心网设备或者核心网设备中的芯片或者片上系统，还可以为核心网设备中用于实现上述各个实施例所述的方法的功能模块。该通信装置可以实现上述各实施例中核心网设备所执行的功能，这些功能可以通过硬件执行相应的软件实现。这些硬件或软件包括一个或多个上述功能相应的模块。该装置可以包括：接收模块，用于接收业务消息，业务消息用于指示远端终端的第一业务；处理模块，用于根据业务消息，确定远端终端处于覆盖范围外；发送模块，用于向至少一个中继终端发送发现请求消息，发现请求消息用于请求发现远端终端。
在一些可能的实施方式中，发现请求消息中携带有发现原因，发现原因用于指示第一业务。
在一些可能的实施方式中，接收模块，还用于接收来自至少一个中继终端中的第一中继终端的第一发现通知消息，第一发现通知消息用于通知第一中继终端成功发现远端终端。
在一些可能的实施方式中，发送模块，还用于根据第一发现通知消息，向至少一个中继终端终的第二中继终端发送释放通知消息，释放通知消息用于指示第二中继终端停止发现远端终端，第二中继终端与第一中继终端不同。
在一些可能的实施方式中，业务消息为下行数据通知消息，下行数据通知消息用于通知远端终端的下行数据不可达。
在一些可能的实施方式中，处理模块，还用于在发送模块向至少一个中继终端发送发现请求消息之前，根据远端终端的最新上下文，确定至少一个中继终端。
根据本公开的第四方面提供一种通信装置，该通信装置可以为通信系统中的第一中继终端设备或者第一中继终端设备中的芯片或者片上系统，还可以为第一中继终端设备中用于实现上述各个实施例所述的方法的功能模块。该通信装置可以实现上述各实施例中第一中继终端设备所执行的功能，这些功能可以通过硬件执行相应的软件实现。这些硬件或软件包括一个或多个上述功能相应的模块。该装置可以包括：接收模块，用于接收来自核心网设备的发现请求消息，发现请求消息为核心网设备在确定远端终端 在覆盖范围外时发送的，发现消息用于请求发现远端终端；发送模块，用于根据发现请求消息，向远端终端发送发现通告消息。
在一些可能的实施方式中，发现请求消息中携带有发现原因，发现原因用于指示远端终端的第一业务。
在一些可能的实施方式中，上述装置还包括：处理模块，用于根据发现原因，确定第一业务的中继业务码。
在一些可能的实施方式中，上述装置还包括：处理模块，用于在发送模块向远端终端发送发现通告消息之后，确定成功发现远端终端；发送模块，还用于向核心网设备发送第一发现通知消息。
在一些可能的实施方式中，接收模块，用于接收来自远端终端的直连通信请求消息；处理模块，具体用于根据直连通信请求消息，确定成功发现远端终端。
根据本公开的第五方面提供一种通信装置，如核心网设备，包括：存储器和处理器；处理器与存储器连接，被配置为通执行存储在存储器上的计算机可执行指令，以实现如上述第一方面及其任一可能的实施方式所述的中继通信方法。
根据本公开的第六方面提供一种通信装置，如中继终端，包括：存储器和处理器；处理器与存储器连接，被配置为通执行存储在存储器上的计算机可执行指令，以实现如上述第二方面及其任一可能的实施方式所述的中继通信方法。
根据本公开的第七方面提供一种计算机可读存储介质，计算机可读存储介质中存储有指令；当指令在计算机上运行时，用于执行如上述第一至二方面及其任一可能的实施方式所述的中继通信方法。
根据本公开的第八方面提供一种计算机程序或计算机程序产品，当计算机程序产品在计算机上被执行时，使得计算机实现如上述第一至二方面及其任一可能的实施方式所述的中继通信方法。
在本公开中，当远端终端的业务到来时，核心网设备确定远端终端处于覆盖范围之外，并触发远端终端的发现过程(discovery procedure)，使得远端终端在被发现后能够与中继终端建立直连通信，进而向覆盖范围外的远端终端传输下行信息(forward the DL traffic)。进一步地，由于可以实现向覆盖范围外的远端终端传输下行信息，使得远端终端不需要通过频繁的注册更新来保持注册状态，减少了不必要的信令开销和功耗。
应当理解的是，本公开的第三至八方面与本公开的第一至二方面的技术方案一致，各方面及对应的可行实施方式所取得的有益效果相似，不再赘述。
附图说明
图1为本公开实施例中的一种通信系统的示意图；
图2为本公开中的一种5G系统架构的示意图；
图3为本公开实施例中的第一种中继通信方法的实施流程示意图；
图4为本公开实施例中的第二种通信方法的实施流程示意图；
图5为本公开实施例中的第一核心网侧的中继通信方法的实施流程示意图；
图6为本公开实施例中的第一中继UE侧的中继通信方法的实施流程示意图；
图7为本公开实施例中的一种通信装置的结构示意图；
图8为本公开实施例中的一种通信设备的结构示意图；
图9为本公开实施例中的一种中继终端的结构示意图；
图10为本公开实施例中的一种核心网设备的结构示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本公开实施例相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本公开实施例的一些方面相一致的装置和方法的例子。
在本公开实施例使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本公开实施例。在本公开实施例和所附权利要求书中所使用的单数形式的“一种”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系。例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，在本公开的描述中，“多个”是指两个或多于两个。
应当理解，尽管在本公开实施例可能采用术语“第一”、“第二”、“第三”等来描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本公开实施例范围的情况下，“第一信息”也可以被称为“第二信息”，类似地，“第二信息”也可以被称为“第一信息”。取决于语境，如在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”。
5G(第五代移动通信技术)网络中定义了5G ProSe终端(use equipment，UE)到网络中继(5G ProSe UE-to-Network Relay)技术，提供中继功能以支持5G ProSe远端UE的网络连接。
本公开实施例提供一种通信系统。该通信系统可以为基于蜂窝移动通信技术的通信系统，如5G(第五代移动通信技术)系统。图1为本公开实施例中的一种通信系统的示意图，参见图1所示，该通信系统100可以包括：远端(remote)UE 101、终端到网络中继(UE-to-Network Relay)102、接入网络103、核心网络104以及数据网络(data network，DN)105。这里，终端到网络中继(UE-to-Network Relay)102可以采用中继(relay)UE实现的，接入网络103可以采用接入网设备实现。
其中，图2为本公开中的一种5G系统架构的示意图，参见图2所示，5G接入网(AN)可以包括下一代无线接入网(next generation radio access network，NG RAN)。相应的，接入网设备可以为接入网侧用于支持终端接入无线通信系统的设备。例如，可以是5G接入技术通信系统中的下一代基站(next generation NodeB，gNB)、发送接收点(transmission reception point，TRP)、中继节点(relay node)、接入点(access point，AP)等。
5G核心网(5GC)可以包括：接入与移动管理功能(access and mobility management function，AMF)设备、会话管理功能(session management function，SMF)设备、用户面功能(user plane function，UPF)设备等。
其中，AMF设备具有接入和移动性管理功能，主要进行移动性管理、接入鉴权/授权等功能。
SMF设备具有会话管理功能，主要进行会话管理、UPF的选择、UE的互联网协议(internet protocol，IP)地址分配等功能。
UPF设备为用户面功能设备，作为和数据网络的接口，完成用户面数据转发、基于会话/流级的计费统计，带宽限制等功能。
上述远端UE和中继UE可以为一种具有无线通信功能的终端，可以部署在陆地上，包括室内或室外、手持、可穿戴或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。上述终端可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端装置、增强现实(augmented reality，AR)终端装置、工业控制(industrial control)中的无线终端、无人驾驶(self-driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。终端也可以是具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备等。在不同的网络中终端装置可以叫做不同的名称，例如：终端装置、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置、蜂窝电话、无绳电话、会话启动协议(sessioninitiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、5G网络或未来演进网络中的终端等。
需要说明的是，远端UE为ProSe UE。
其中，各接口描述如下：
PC5：远端UE与中继UE之间的接口。
Uu：中继UE与NGRAN之间的接口。
N6：5GC与DN之间的接口。
N4：SMF与UPF之间的接口，用于控制面与用户面之间传递信息，包括控制面向用户面的转发规则、QoS控制规则、流量统计规则等的下发以及用户面的信息上报。
N11：SMF与AMF之间的接口，用于传递RAN和UPF之间的PDU会话隧道信息、传递发送给UE的控制消息、传递发送给RAN的无线资源控制信息等。
N2：AMF与RAN之间的接口，用于传递核心网侧至RAN的无线承载控制信息等。
进一步地，在5GC中还可以包括：网络功能(network function，NF)，如应用功能(application function，AF)设备。AF设备可以指提供应用层的各种服务的设备。示例性的，AF设备可以是运营商内部的应用(如语音业务的AF设备)，也可以是第三方的AF设备(如视频服务器、游戏服务器)。当然，AF设备还可以存在其他情况，本公开实施例对此不作具体限定。
需要说明的是，各设备的功能以及接口仅为示例性的，各个设备在应用于本公开实施例中时，并非全部功能都是必需的。核心网的全部或者部分设备可以是物理上的设备，也可以是虚拟化的设备，在此不做限定。当然，本公开实施例中的通信系统还可以包括未在图1中示出的其他设备，在此不做限定。
目前，在上述通信系统中，在如公共安全业务或者商业业务中，中继UE可以作为远端UE的中继， 使得远端UE能够通过中继UE与网络进行通信，如接收来自网络的下行信息。
但是，由于远端UE和中继UE的移动性，远端UE可能会处于网络覆盖范围外(out of coverage，OOC)，此时，如何向远端UE传输下行信息是一个亟待解决的问题。
为了解决上述问题，本公开实施例提供一种中继通信方法，该通信方法可以应用于上述通信系统。
下面结合上述通信系统对本公开实施例提供的中继通信方法进行说明。
在本公开实施例中，如果没有特别说明，接入网设备可以为5G网络中的基站，如gNB。核心网设备可以为5G核心网设备，如AMF设备、SMF设备、UPF设备等。当然，随着无线通信技术的发展，接入网设备还可以为gNB的演进，核心网设备还可以为AMF设备、SMF设备、UPF设备等设备的演进，本公开实施例对此不做具体限定。
图3为本公开实施例中的第一种中继通信方法的实施流程示意图，参见图3所示，该通信方法可以包括：
S301，AMF设备接收业务消息。
其中，业务消息用于指示远端UE的第一业务。
在本公开实施例中，第一业务可以理解为远端UE的下行业务，如下行数据传输业务、由AF或者5GC中其他NF等触发的定位业务等。相应的，业务消息可以为下行业务对应的消息，如来自UPF的数据通知消息(data notification)、来自AF的定位请求消息(location request)等。第一业务的下行信息可以为远端UE的下行数据、远端UE的定位控制信息等。当然，第一业务、业务消息以及第一业务的下行信息还可以为其他情况，本公开实施例崔西不做具体限定。
示例性的，若第一业务为下行数据传输业务，则S301可以为：AMF设备接收UPF设备发送的data notification；或者，若第一业务为定位业务，则S301可以为：AMF设备接收AF设备发送的定位请求消息。
具体来说，UPF设备在接收到远端UE的第一个下行数据包时，确定与远端UE之间不存在用于下行传输的N3隧道，此时，远端UE的下行数据不可达。那么，UPF设备向SMF设备发送data notification，以通知远端UE的下行数据不可达。SMF设备向AMF设备发送data notification，以触发远端UE的发现过程。
或者，AF设备触发定位业务，AF设备向AMF设备发送location request，以触发远端UE的发现过程。
当然，上述通信系统还可以采用其他方式触发远端UE的发现过程，本公开实施例对此不做具体限定。
在实际应用中，业务消息中可以携带有远端UE的标识信息，以向AMF设备指示远端UE。示例性的，远端UE的标识信息可以为通用公共用户标识(generic public subscription identifier，GPSI)、用户永久标识(subscription permanent identifier，SUPI)等。
S302，AMF设备根据业务消息，确定远端UE处于覆盖范围外。
应理解的，AMF设备在收到业务消息之后，可以根据远端UE的上下文、远端UE上报的位置信息等确定远端UE是否处于覆盖范围外。例如，当AMF设备中不存在远端UE的上下文或者仅存在部 分上下文时，AMF设备确定远端UE处于覆盖范围外。或者，AMF设备根据远端UE周期上报的位置信息或者由离开小区触发上报的位置信息，确定远端UE的移动轨迹，进而判断该远端UE是否处于覆盖范围外。当然，AMF还可以通过其他方式确定远端UE是否处于覆盖范围外，本公开实施例对此不作具体限定。
在一些可能的实施方式中，AMF设备在执行S302之后，还可以根据远端UE最新的上下文，确定至少一个中继UE。这里，至少一个中继UE可以理解为为远端UE提供中继的候选中继UE。
需要说明的是，在S301之前，候选中继UE可以为任意中继业务码(relay service code，RSC)建立用于中继的分组数据单元(packet data unit，PDU)会话(session)。
S303，AMF设备向候选中继UE发送发现请求消息(discovery request)，以请求发现远端UE，进而触发远端UE的发现过程。
在一些可能的实施方式中，发现请求消息中可以携带有发现原因(discovery cause)，发现原因用于指示第一业务。例如，发现原因可以为下行数据传输、定位请求等。
至此，AMF设备触发远端UE的发现过程。
S304，候选中继UE根据发现请求消息，发起远端UE的发现过程。
应理解的，候选中继UE在接收到AMF设备发送的发现请求消息之后，向远端UE发送发现通告消息(discovery announcement)，以发起远端UE的发现过程。需要说明的是，发现通告信息中可以不携带发现原因。
接下来，远端UE接收来自候选中继UE中一个或者多个中继UE发送的发现通告消息，并从这一个或者多个中继UE中选择一个作为中继服务的提供UE(即第一中继UE，也可以描述为目标中继UE)。然后，远端UE向选中的第一中继UE发送直连通信请求消息，如单播直连通信请求消息(unicast direct communication request)，以请求与第一中继UE建立PC5接口上的直连通信。第一中继UE在接收到远端UE发送的直连通信请求消息后，确认自身成功发现远端UE。
在一实施例中，远端UE可以根据自身的性能参数、处理能力，以及远端UE与上述一个或者多个中继UE之间的信道质量等，确定确定第一中继UE。当然，远端UE还可以依据其他因素选择第一中继UE，本公开实施例对此不做具体限定。
S305，第一中继UE确定成功发现远端UE。
应理解的，第一中继UE在收到来自远端UE的直连通信请求消息后，可以确认成功发现远端UE，进而向AMF设备发送发现通知消息(discovery notification)。
S306，第一中继UE向AMF设备发送第一发现通知消息。
其中，第一发现通知消息用于向AMF设备通知第一中继UE成功发现远端UE。
S307，AMF设备根据第一发现通知消息，确定第一中继UE成功发现远端UE。
应理解的，AMF设备接收到第一发现请求信息后，确定第一中继UE成功发现远端UE，然后，
AMF设备向SMF设备请求为第一中继UE建立用于中继的PDU session。
在一些可能的实施方式中，为了节约资源，降低功耗，在S306之后，AMF设备还可以根据第一发现通知消息，向第二中继UE发送释放通知消息(release notification)。其中，释放通知消息用于指示 第二中继UE停止发现远端UE。
在本公开实施例中，第二中继UE可以指上述候选中继UE中除第一中继UE外的其他中继UE。
S308，第一中继UE建立用于第一业务中继的PDU session。
在本公开实施例中，上述发现原因可以由AMF设备通过S303携带在发现请求消息中下发至候选中继UE。相应的，在S308中，第一中继UE可以根据发现原因，为第一业务确定中继业务码，进而根据第一业务的中继业务码建立PDU session。
需要说明的是，第一中继UE在执行S308时，如果没有与第一业务的中继业务码关联的PDU session或需要新的PDU session进行中继，则第一中继UE在与远端UE完成PC5接口上的直连通信连接建立之前，发起新的PDU session建立过程。反之，如果有与第一业务的中继业务码关联的PDU session，则第一中继UE可以继续使用该PDU session为远端UE提供中继服务。
S309，第一中继UE向远端UE中继第一业务的下行信息。
至此，实现覆盖范围外的远端UE的5G UE-to-Network Relay。
下面以具体示例对上述通信方法进行说明。
假设，通信系统中存在中继UE1、中继UE2以及中继UE3。
当UPF设备接收到远端UE的第一个下行数据包，但不存在用于下行数据传输的N3隧道时，UPF设备通过SMF设备向AMF设备发送数据通知，进而触发以下通信过程。
图4为本公开实施例中的第二种通信方法的实施流程示意图，参见图4所示，该通信过程可以包括：
S401，UPF设备向SMF设备发送data notification；
S402，SMF设备向AMF设备发送data notification；
S403，AMF设备确定远端UE处于覆盖范围外，并确定候选中继UE；
其中，候选中继UE可以包括中继UE1、中继UE2以及中继UE3。
S404，AMF设备向中继UE1、中继UE2以及中继UE3发送discovery request；
其中，discovery request中可以携带有discovery cause。
S405，中继UE1、中继UE2以及中继UE3分别向远端UE发送discovery announcement；
此时，远端UE接收到中继UE1和中继UE2发送的discovery announcement，并选择UE1作为目标中继UE。
S406，远端UE向中继UE1发送unicast direct communication request；
此时，中继UE1确定成功发现远端UE。
S407，中继UE1向AMF设备发送discovery notification；
此时，AMF设备接收到来自UE1的discovery notification。
S408，AMF设备向SMF设备发送session establishment request；
可选的，在S407之后，还可以执行S409。
S409，AMF设备向中继UE2和中继UE3发送release notification，以指示中继UE2和中继UE3释放远端UE的发现过程。
S410，SMF设备为中继UE1建立用于第一业务中继的PDU session；
S411，SMF设备向中继UE1发送session establishment response。
S412，中继UE1向远端UE发送unicast direct communication response。
此时，中继UE1与远端UE建立单播直连通信。
S413，中继UE1将下行数据由UPF设备中继至远端UE。
在本公开实施例中，当远端UE的业务到来时，AMF设备确定远端UE处于覆盖范围之外，并触发远端UE的发现过程，使得远端UE在被发现后能够与中继UE建立直连通信，进而由中继UE向覆盖范围外的远端UE中继下行信息(forward the DL traffic)。进一步地，由于可以实现向覆盖范围外的远端UE中继下行信息，使得远端UE不需要通过频繁的注册更新来保持注册状态，减少了不必要的信令开销和功耗。
基于相同的发明构思，本公开实施例提供一种中继通信方法，可以应用于上述通信系统中的核心网设备，如AMF设备。
图5为本公开实施例中的第一核心网侧的中继通信方法的实施流程示意图，参见图5所示，该方法可以包括：
S501，AMF设备接收业务消息；
其中，业务消息用于指示远端UE的第一业务。
在一些可能的实施方式中，业务消息为下行数据通知消息，下行数据通知消息用于通知远端UE的下行数据不可达。
S502，AMF设备根据业务消息，确定远端UE处于覆盖范围外；
在一些可能的实施方式中，上述方法还可以包括：AMF设备根据远端UE的最新上下文，确定至少一个中继UE。
S503，AMF设备向至少一个中继UE发送发现请求消息。
其中，发现请求消息用于请求发现远端UE。
在一些可能的实施方式中，上述发现请求消息中可以携带有发现原因，以指示第一业务。
在一些可能的实施方式中，在S503之后，上述方法还包括：AMF设备接收来自至少一个中继UE中的第一中继UE的第一发现通知消息，以通知第一中继UE成功发现远端UE。
在一些可能的实施方式中，为了节约资源，降低功耗，上述方法还包括：AMF设备根据第一发现通知消息，向至少一个中继UE中的第二中继UE发送释放通知消息，释放通知消息用于指示第二中继UE停止发现远端UE，第二中继UE与第一中继UE不同。
需要说明的是，S501至S503的实施过程可以参见图2至图4实施例中的具体描述，为了说明书的简洁，在此不做赘述。
基于相同的发明构思，本公开实施例提供一种中继通信方法，可以应用于上述通信系统中的第一中继UE。
图6为本公开实施例中的第一中继UE侧的中继通信方法的实施流程示意图，参见图6所示，该方法可以包括：
S601，第一中继UE接收来自AMF设备的发现请求消息；
其中，发现请求消息为AMF设备在确定远端UE在覆盖范围外时发送的，发现消息用于请求发现远端UE；
S602，第一中继UE根据发现请求消息，向远端UE发送发现通告消息。
在一些可能的实施方式中，上述发现请求消息中可以携带有发现原因，以指示远端UE的第一业务。
在一些可能的实施方式中，上述方法还包括：第一中继UE根据发现原因，确定第一业务的中继业务码。
在一些可能的实施方式中，在S602息之后，上述方法还包括：第一中继UE确定成功发现远端UE；第一中继UE向AMF设备发送第一发现通知消息。
在一些可能的实施方式中，第一中继UE确定成功发现远端UE，包括：第一中继UE接收来自远端UE的直连通信请求消息；第一中继UE根据直连通信请求消息，确定成功发现远端UE。
在一些可能的实施方式中，在第一中继UE根据确定成功发现远端UE之后，上述方法还包括：第一中继UE与远端UE建立单播直连通信，单播直连通信用于传输第一业务的下行信息。
需要说明的是，S601至S602的实施过程可以参见图2至图4实施例中的具体描述，为了说明书的简洁，在此不做赘述。
基于相同的发明构思，本公开实施例提供一种通信装置，图7为本公开实施例中的一种通信装置的结构示意图，参见图7所示，该通信装置700可以包括：接收模块701、处理模块702以及发送模块703。
在一些可能的实施方式中，该通信装置700可以为通信系统中的核心网设备或者核心网设备中的芯片或者片上系统，还可以为核心网设备中用于实现上述各个实施例所述的方法的功能模块。该通信装置可以实现上述各实施例中核心网设备所执行的功能，这些功能可以通过硬件执行相应的软件实现。这些硬件或软件包括一个或多个上述功能相应的模块。
那么，接收模块701，用于接收业务消息，业务消息用于指示远端终端的第一业务；处理模块702，用于根据业务消息，确定远端终端处于覆盖范围外；发送模块703，用于向至少一个中继终端发送发现请求消息，发现请求消息用于请求发现远端终端。
在一些可能的实施方式中，发现请求消息中携带有发现原因，发现原因用于指示第一业务。
在一些可能的实施方式中，接收模块701，还用于接收来自至少一个中继终端中的第一中继终端的第一发现通知消息，第一发现通知消息用于通知第一中继终端成功发现远端终端。
在一些可能的实施方式中，发送模块703，还用于根据第一发现通知消息，向至少一个中继终端终的第二中继终端发送释放通知消息，释放通知消息用于指示第二中继终端停止发现远端终端，第二中继终端与第一中继终端不同。
在一些可能的实施方式中，业务消息为下行数据通知消息，下行数据通知消息用于通知远端终端的下行数据不可达。
在一些可能的实施方式中，处理模块702，还用于在发送模块向至少一个中继终端发送发现请求消息之前，根据远端终端的最新上下文，确定至少一个中继终端。
在一些可能的实施方式中，该通信装置700还可以为通信系统中的第一中继终端设备或者第一中继终端设备中的芯片或者片上系统，还可以为第一中继终端设备中用于实现上述各个实施例所述的方法的 功能模块。该通信装置可以实现上述各实施例中第一中继终端设备所执行的功能，这些功能可以通过硬件执行相应的软件实现。这些硬件或软件包括一个或多个上述功能相应的模块。
那么，接收模块701，用于接收来自核心网设备的发现请求消息，发现请求消息为核心网设备在确定远端终端在覆盖范围外时发送的，发现消息用于请求发现远端终端；发送模块703，用于根据发现请求消息，向远端终端发送发现通告消息。
在一些可能的实施方式中，发现请求消息中携带有发现原因，发现原因用于指示远端终端的第一业务。
在一些可能的实施方式中，处理模块702，用于根据发现原因，确定第一业务的中继业务码。
在一些可能的实施方式中，处理模块702，用于在发送模块向远端终端发送发现通告消息之后，确定成功发现远端终端；发送模块703，还用于向核心网设备发送第一发现通知消息。
在一些可能的实施方式中，接收模块701，用于接收来自远端终端的直连通信请求消息；处理模块，具体用于根据直连通信请求消息，确定成功发现远端终端。
需要说明的是，接收模块701、处理模块702和发送模块703的具体实现过程可参考图2至图6实施例的详细描述，为了说明书的简洁，这里不再赘述。
本公开实施例中提到的接收模块701可以为接收接口、接收电路或者接收器等；发送模块703可以为发送接口、发送电路或者发送器等；处理模块702可以为一个或者多个处理器。
基于相同的发明构思，本公开实施例提供一种通信设备，该通信设备可以为上述一个或者多个实施例中所述的核心网设备或者第一中继终端。图8为本公开实施例中的一种通信设备的结构示意图，参见图8所示，通信设备800，采用了通用的计算机硬件，包括处理器801、存储器802、总线803、输入设备804和输出设备805。
在一些可能的实施方式中，存储器802可以包括以易失性和/或非易失性存储器形式的计算机存储媒体，如只读存储器和/或随机存取存储器。存储器802可以存储操作系统、应用程序、其他程序模块、可执行代码、程序数据、用户数据等。
输入设备804可以用于向通信设备输入命令和信息，输入设备804如键盘或指向设备，如鼠标、轨迹球、触摸板、麦克风、操纵杆、游戏垫、卫星电视天线、扫描仪或类似设备。这些输入设备可以通过总线803连接至处理器801。
输出设备805可以用于通信设备输出信息，除了监视器之外，输出设备805还可以为其他外围输出设各，如扬声器和/或打印设备，这些输出设备也可以通过总线803连接到处理器801。
通信设备可以通过天线806连接到网络中，例如连接到局域网(local area network，LAN)。在联网环境下，控制备中存储的计算机执行指令可以存储在远端存储设备中，而不限于在本地存储。
当通信设备中的处理器801执行存储器802中存储的可执行代码或应用程序时，通信设备以执行以上实施例中的UE侧或者网络设备侧的中继通信方法，具体执行过程参见上述实施例，在此不再赘述。
此外，上述存储器802中存储有用于实现图7中的接收模块701、处理模块702和发送模块703的功能的计算机执行指令。图7中的接收模块701、处理模块702和发送模块703的功能/实现过程均可以通过图8中的处理器801调用存储器802中存储的计算机执行指令来实现，具体实现过程和功能参考上 述相关实施例。
基于相同的发明构思，本公开实施例提供一种通信装置，如中继终端，与上述一个或者多个实施例中的第一中继UE一致。可选的，中继终端可以为移动电话，计算机，数字广播终端，消息收发设备，游戏控制台，平板设备，医疗设备，健身设备，个人数字助理等。
图9为本公开实施例中的一种中继终端的结构示意图，参见图9所示，中继终端900可以包括以下一个或多个组件：处理组件901、存储器902、电源组件903、多媒体组件904、音频组件905、输入/输出(I/O)的接口906、传感器组件907以及通信组件908。
处理组件901通常控制中继终端900的整体操作，诸如与显示，电话呼叫，数据通信，相机操作和记录操作相关联的操作。处理组件901可以包括一个或多个处理器910来执行指令，以完成上述的方法的全部或部分步骤。此外，处理组件901可以包括一个或多个模块，便于处理组件901和其他组件之间的交互。例如，处理组件901可以包括多媒体模块，以方便多媒体组件904和处理组件901之间的交互。
存储器902被配置为存储各种类型的数据以支持在中继终端900的操作。这些数据的示例包括用于在中继终端900上操作的任何应用程序或方法的指令，联系人数据，电话簿数据，消息，图片，视频等。存储器902可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
电源组件903为中继终端900的各种组件提供电力。电源组件903可以包括电源管理系统，一个或多个电源，及其他与为中继终端900生成、管理和分配电力相关联的组件。
多媒体组件904包括在中继终端900和用户之间的提供一个输出接口的屏幕。在一些实施例中，屏幕可以包括液晶显示器(LCD)和触摸面板(TP)。如果屏幕包括触摸面板，屏幕可以被实现为触摸屏，以接收来自用户的输入信号。触摸面板包括一个或多个触摸传感器以感测触摸、滑动和触摸面板上的手势。触摸传感器可以不仅感测触摸或滑动动作的边界，而且还检测与触摸或滑动操作相关的持续时间和压力。在一些实施例中，多媒体组件904包括一个前置摄像头和/或后置摄像头。当中继终端900处于操作模式，如拍摄模式或视频模式时，前置摄像头和/或后置摄像头可以接收外部的多媒体数据。每个前置摄像头和后置摄像头可以是一个固定的光学透镜系统或具有焦距和光学变焦能力。
音频组件905被配置为输出和/或输入音频信号。例如，音频组件905包括一个麦克风(MIC)，当中继终端900处于操作模式，如呼叫模式、记录模式和语音识别模式时，麦克风被配置为接收外部音频信号。所接收的音频信号可以被进一步存储在存储器902或经由通信组件908发送。在一些实施例中，音频组件905还包括一个扬声器，用于输出音频信号。
I/O接口906为处理组件901和外围接口模块之间提供接口，上述外围接口模块可以是键盘，点击轮，按钮等。这些按钮可包括但不限于：主页按钮、音量按钮、启动按钮和锁定按钮。
传感器组件907包括一个或多个传感器，用于为中继终端900提供各个方面的状态评估。例如，传感器组件907可以检测到中继终端900的打开/关闭状态，组件的相对定位，例如组件为中继终端900的显示器和小键盘，传感器组件907还可以检测中继终端900或中继终端900一个组件的位置改变，用户与中继终端900接触的存在或不存在，中继终端900方位或加速/减速和中继终端900的温度变化。 传感器组件907可以包括接近传感器，被配置用来在没有任何的物理接触时检测附近物体的存在。传感器组件907还可以包括光传感器，如CMOS或CCD图像传感器，用于在成像应用中使用。在一些实施例中，该传感器组件907还可以包括加速度传感器，陀螺仪传感器，磁传感器，压力传感器或温度传感器。
通信组件908被配置为便于中继终端900和其他设备之间有线或无线方式的通信。中继终端900可以接入基于通信标准的无线网络，如Wi-Fi，2G或3G，或它们的组合。在一个示例性实施例中，通信组件908经由广播信道接收来自外部广播管理系统的广播信号或广播相关信息。在一个示例性实施例中，通信组件908还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其他技术来实现。
在示例性实施例中，中继终端900可以被一个或多个应用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、控制器、微控制器、微处理器或其他电子元件实现，用于执行上述方法。
基于相同的发明构思，本公开实施例提供一种通信装置，如核心网设备，与上述一个或者多个实施例中的AMF设备一致。
图10为本公开实施例中的一种核心网设备的结构示意图，参见图10所示，核心网设备1000可以包括处理组件1001，其进一步包括一个或多个处理器，以及由存储器1002所代表的存储器资源，用于存储可由处理组件1001的执行的指令，例如应用程序。存储器1002中存储的应用程序可以包括一个或一个以上的每一个对应于一组指令的模块。此外，处理组件1001被配置为执行指令，以执行上述方法前述应用在所述核心网设备的任一方法。
核心网设备1000还可以包括一个电源组件1003被配置为执行核心网设备1000的电源管理，一个有线或无线网络接口1004被配置为将核心网设备1000连接到网络，和一个输入输出(I/O)接口1005。核心网设备1000可以操作基于存储在存储器1002的操作系统，例如Windows Server TM，Mac OS XTM，UnixTM，LinuxTM，FreeBSDTM或类似。
基于相同的发明构思，本公开实施例还提供一种计算机可读存储介质，计算机可读存储介质中存储有指令；当指令在计算机上运行时，用于执行上述一个或者多个实施例中核心网设备侧或者中继终端侧的中继通信方法。
基于相同的发明构思，本公开实施例还提供一种计算机程序或计算机程序产品，当计算机程序产品在计算机上被执行时，使得计算机实现上述一个或者多个实施例中核心网设备侧或者中继终端侧的中继通信方法。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本发明的其它实施方案。本公开旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精神由下面的权利要求指出。
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其 范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。

Claims (25)

  1. 一种中继通信方法，其特征在于，包括：
    核心网设备接收业务消息，所述业务消息用于指示远程终端的第一业务；
    所述核心网设备确定所述远程终端处于覆盖范围外；
    所述核心网设备向至少一个中继终端发送发现请求消息，所述发现请求消息用于请求发现所述远程终端。
  2. 根据权利要求1所述的方法，其特征在于，所述发现请求消息中携带有发现原因，所述发现原因用于指示所述第一业务。
  3. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述核心网设备接收来自所述至少一个中继终端中的第一中继终端的第一发现通知消息，所述第一发现通知消息用于指示所述第一中继终端成功发现所述远程终端。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    所述核心网设备向所述至少一个中继终端中的第二中继终端发送释放通知消息，所述释放通知消息用于指示所述第二中继终端停止发现所述远程终端发现过程，所述第二中继终端与所述第一中继终端不同。
  5. 根据权利要求1所述的方法，其特征在于，所述业务消息为下行数据通知消息，所述下行数据通知消息用于通知所述远程终端的下行数据不可达。
  6. 一种中继通信方法，其特征在于，包括：
    第一中继终端接收来自核心网设备的发现请求消息，所述发现请求消息为所述核心网设备在确定远程终端在覆盖范围外时发送的，所述发现消息用于请求发现所述远程终端；
    所述第一中继终端向所述远程终端发送发现通告消息。
  7. 根据权利要求6所述的方法，其特征在于，所述发现请求消息中携带有发现原因，所述发现原因用于指示所述远程终端的第一业务。
  8. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    所述第一中继终端根据所述发现原因，确定所述第一业务的中继业务码。
  9. 根据权利要求6所述的方法，其特征在于，在所述第一中继终端向所述远程终端发送发现通告消息之后，所述方法还包括：
    所述第一中继终端确定成功发现所述远程终端；
    所述第一中继终端向所述核心网设备发送第一发现通知消息。
  10. 根据权利要求9所述的方法，其特征在于，所述第一中继终端确定成功发现所述远程终端，包括：
    所述第一中继终端接收来自所述远程终端的直连通信请求消息；
    所述第一中继终端确定成功发现所述远程终端。
  11. 根据权利要求9所述的方法，其特征在于，所述第一中继终端确定成功发现所述远程终端，所述方法还包括：
    所述第一中继终端与所述远程终端建立单播直连通信，所述单播直连通信用于传输第一业务的下行信息。
  12. 一种核心网设备，其特征在于，包括：
    接收模块，用于接收业务消息，所述业务消息用于指示远程终端的第一业务；
    处理模块，用于根据所述业务消息，确定所述远程终端处于覆盖范围外；
    发送模块，用于向至少一个中继终端发送发现请求消息，所述发现请求消息用于请求发现所述远程终端。
  13. 根据权利要求12所述的核心网设备，其特征在于，所述发现请求消息中携带有发现原因，所述发现原因用于指示所述第一业务。
  14. 根据权利要求12所述的核心网设备，其特征在于，所述接收模块，还用于接收来自所述至少一个中继终端中的第一中继终端的第一发现通知消息，所述第一发现通知消息用于指示所述第一中继终端成功发现所述远程终端。
  15. 根据权利要求14所述的核心网设备，其特征在于，所述发送模块，还用于根据所述第一发现通知消息，向所述至少一个中继终端终的第二中继终端发送释放通知消息，所述释放通知消息用于指示所述第二中继终端停止发现所述远程终端发现过程，所述第二中继终端与所述第一中继终端不同。
  16. 根据权利要求12所述的核心网设备，其特征在于，所述业务消息为下行数据通知消息，所述下行数据通知消息用于通知所述远程终端的下行数据不可达。
  17. 一种中继终端，其特征在于，包括：
    接收模块，用于接收来自核心网设备的发现请求消息，所述发现请求消息为所述核心网设备在确定远程终端在覆盖范围外时发送的，所述发现消息用于请求发现所述远程终端；
    发送模块，用于根据所述发现请求消息，向所述远程终端发送发现通告消息。
  18. 根据权利要求17所述的中继终端，其特征在于，所述发现请求消息中携带有发现原因，所述发现原因用于指示所述远程终端的第一业务。
  19. 根据权利要求18所述的中继终端，其特征在于，所述中继终端还包括：处理模块，用于根据所述发现原因，确定所述第一业务的中继业务码。
  20. 根据权利要求18所述的中继终端，其特征在于，所述中继终端还包括：处理模块，用于在所述发送模块向所述远程终端发送所述发现通告消息之后，确定成功发现所述远程终端；
    所述发送模块，还用于向所述核心网设备发送第一发现通知消息。
  21. 根据权利要求20所述的中继终端，其特征在于，所述接收模块，用于接收来自所述远程终端的直连通信请求消息；
    所述处理模块，用根据所述直连通信请求消息，确定成功发现所述远程终端。
  22. 根据权利要求21所述的中继终端，其特征在于，所述处理模块，用于在确定成功发现所述远程终端之后，与所述远程终端建立单播直连通信，所述单播直连通信用于传输所述第一业务的下行信息。
  23. 一种通信装置，其特征在于，包括：存储器和处理器；所述处理器与所述存储器连接，被配置为通执行存储在所述存储器上的计算机可执行指令，以实现如权利要求1至5任一项所述的中继通信方 法。
  24. 一种通信装置，其特征在于，包括：存储器和处理器；所述处理器与所述存储器连接，被配置为通执行存储在所述存储器上的计算机可执行指令，以实现如权利要求6至11任一项所述的中继通信方法。
  25. 一种计算机存储介质，存储有计算机可执行指令，其特征在于，所述计算机可执行指令被处理器执行后能够实现如权利要求1至11任一项所述的中继通信方法。
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