WO2024114022A1 - Procédé et système de commande de session, et élément de réseau smf - Google Patents

Procédé et système de commande de session, et élément de réseau smf Download PDF

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Publication number
WO2024114022A1
WO2024114022A1 PCT/CN2023/117531 CN2023117531W WO2024114022A1 WO 2024114022 A1 WO2024114022 A1 WO 2024114022A1 CN 2023117531 W CN2023117531 W CN 2023117531W WO 2024114022 A1 WO2024114022 A1 WO 2024114022A1
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WIPO (PCT)
Prior art keywords
group
session
relay
remote
network element
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PCT/CN2023/117531
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English (en)
Chinese (zh)
Inventor
刘洁
毕奇
林奕琳
陈思柏
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中国电信股份有限公司
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Publication of WO2024114022A1 publication Critical patent/WO2024114022A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/141—Setup of application sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/146—Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present disclosure relates to the field of communication technology, and in particular to a session control method, system and SMF network element.
  • remote user equipment outside the coverage of the communication network can be connected to the communication network through a relay UE with UE-to-network relay capability within the coverage of the communication network, and then communicate with the communication network.
  • remote UE usually refers to an off-network device outside the coverage of the communication network
  • a relay UE with UE-to-network relay capability refers to an on-network device within the coverage of the communication network that can provide relay services for communication between the remote UE and the communication network.
  • each group in the network has a group session parameter for identifying the group.
  • the relay UE can initiate a session establishment request to the session management function (SMF) network element according to the group session parameter of the group to which it belongs, so as to request the SMF network element to establish a corresponding group session for itself.
  • the relay UE can also initiate a session establishment request to the SMF network element for the group session parameter of the group to which the remote UE belongs, so as to request the SMF network element to establish a group session for the remote UE to perform group communication.
  • SMF session management function
  • a session control method including: a session management function SMF network element responding to a first session establishment request from a relay user equipment UE, establishing a first group session for the relay UE, wherein the first session establishment request carries a first group session parameter; the SMF network element responding to a second session establishment request from the relay UE, establishing a second group session for the relay UE for group communication of a remote UE, wherein the second session establishment request carries a second group session parameter, and the second group session parameter is different from the first group session parameter; the SMF network element performs group communication on the first group session and the second group session.
  • the group sessions are session controlled in corresponding groups respectively, and when the remote UE and the relay UE belong to the same group, the first group session and the second group session are session controlled as group sessions of the same group.
  • the SMF network element determines the group to which the remote UE belongs and the group to which the relay UE belongs based on the first group session parameter and the second group session parameter.
  • the method also includes: the SMF network element receives information from the relay UE, the information including a first correspondence between a first relay service code RSC and the second group session parameter; the SMF network element determines whether the first RSC and the second RSC are the same based on the first correspondence and a second correspondence between the first group session parameter and the second RSC; the SMF network element determines that the remote UE and the relay UE belong to the same group when the first RSC and the second RSC are the same.
  • the data network name DNN in the first group session parameter is different from the DNN in the second group session parameter; and/or the single network slice selection assistance information S-NSSAI in the first group session parameter is different from the S-NSSAI in the second group session parameter.
  • the remote UE accesses the core network via the relay UE in the L3 network, and the access to the core network does not pass through a non-3GPP interworking function N3IWF network element.
  • the method also includes: the SMF network element receives the IP address of the remote UE sent by the relay UE, and the IP address of the remote UE is different from the IP address of the relay UE.
  • the SMF network element receives multiple IP addresses of the remote UEs sent by the relay UE, and the IP addresses of the multiple remote UEs are different from each other.
  • the method also includes: the direct discovery name management function DDNMF network element receives an address allocation request from the relay UE, the address allocation request carries the IP address of the relay UE and the identifier of the remote UE; and sends the IP address of the remote UE allocated to the remote UE to the relay UE.
  • the direct discovery name management function DDNMF network element receives an address allocation request from the relay UE, the address allocation request carries the IP address of the relay UE and the identifier of the remote UE; and sends the IP address of the remote UE allocated to the remote UE to the relay UE.
  • the IP address of the remote UE and the IP address of the relay UE are located in the same network segment.
  • the IP address of the remote UE is an IPv4 address.
  • the method further includes: the SMF network element receives session context update information of the relay UE from the DDNMF network element, the session context update information including the correspondence between the IP address of the relay UE and the IP address of the remote UE; the SMF network element updates the first group session and the The second group session is session controlled as the group session of the same group, including: the SMF network element constructs a session control policy based on the session context update information, taking the first group session and the second group session as the group session of the same group, and the session control policy includes a group session forwarding policy.
  • the first group session and the second group session are both virtual network VN group sessions.
  • a SMF network element including: a session establishment module, configured to establish a first group session for the relay UE in response to a first session establishment request from the relay UE, the first session establishment request carrying a first group session parameter; and to establish a second group session for the remote UE in response to a second session establishment request from the relay UE, the second session establishment request carrying a second group session parameter, the second group session parameter being different from the first group session parameter; a session control module, configured to perform session control on the first group session and the second group session in corresponding groups respectively, and when the remote UE and the relay UE belong to the same group, perform session control on the first group session and the second group session as group sessions of the same group.
  • an SMF network element comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the method described in any one of the above embodiments based on instructions stored in the memory.
  • a session control system comprising: the SMF network element described in any one of the above embodiments, and the DDNMF network element, configured to receive an address allocation request from the relay UE, the address allocation request carrying the IP address of the relay UE and the identifier of the remote UE; and sending the IP address of the remote UE allocated to the remote UE to the relay UE.
  • the system further includes: a relay UE configured to send the first session establishment request and the second session establishment request to the SMF network element, and to send the address allocation request to the DDNMF network element.
  • a relay UE configured to send the first session establishment request and the second session establishment request to the SMF network element, and to send the address allocation request to the DDNMF network element.
  • a computer-readable storage medium comprising computer program instructions, wherein when the computer program instructions are executed by a processor, the method described in any one of the above embodiments is implemented.
  • a computer program product including a computer program, wherein when the computer program is executed by a processor, the method described in any one of the above embodiments is implemented.
  • the SMF network element can establish a group session for the relay UE itself to perform group communication and a remote UE to access the network via the relay UE according to two different group session parameters.
  • the relay UE can perform group communication, and when the remote UE and the relay UE belong to the same group, the two group sessions can be controlled as group sessions of the same group.
  • the SMF network element can distinguish the session establishment request initiated by the relay UE for its own group communication and the session establishment request initiated by the relay UE for the remote UE to perform group communication according to two different group session parameters, so as to respectively establish a group session for the relay UE itself to perform group communication and a group session for the remote UE to perform group communication, thereby avoiding the problem that the SMF network element cannot establish group sessions for both the relay UE and the remote UE when the relay UE and the remote UE that access the network via the relay UE belong to the same group, thereby allowing the relay UE and the remote UE to perform group communication at the same time.
  • FIG1 is a flow chart of a session control method according to some embodiments of the present disclosure.
  • FIG2 is a flow chart of a session control method according to other embodiments of the present disclosure.
  • FIG3 is a flow chart of a session control method according to yet other embodiments of the present disclosure.
  • FIG4 is a flow chart of a session control method according to some further embodiments of the present disclosure.
  • FIG5 is a schematic diagram of the structure of an SMF network element according to some embodiments of the present disclosure.
  • FIG6 is a schematic diagram of the structure of an SMF network element according to other embodiments of the present disclosure.
  • FIG. 7 is a schematic diagram of the structure of a conversation control system according to some embodiments of the present disclosure.
  • FIG1 is a flow chart of a session control method according to some embodiments of the present disclosure.
  • step 102 the SMF network element establishes a first group session for the relay UE in response to a first session establishment request from the relay UE.
  • the first session establishment request carries the first group session parameter.
  • the first group session is a group session used to relay the UE itself to perform group communication.
  • the first group session may be a virtual network (Virtual Network, VN) group session
  • the first group session parameters may include a data network name (Data Network Name, DNN) and single network slice selection assistance information (Single Network Slice Selection Assistance Information, S-NSSAI).
  • step 104 the SMF network element establishes a second group session for the relay UE for group communication with the remote UE in response to the second session establishment request from the relay UE.
  • the second session establishment request carries a second group session parameter, and the second group session parameter is different from the first group session parameter.
  • the remote UE is a UE that accesses the network via a relay UE.
  • the remote UE may select a relay UE by initiating a relay discovery process, and may establish a relay connection (eg, a PC5 connection) with the relay UE.
  • the UE can access the network through the relay.
  • the second group session may be a VN group session
  • the second group session parameters may include DNN and S-NSSAI.
  • the DNN in the first group session parameters is different from the DNN in the second group session parameters; and/or the S-NSSAI in the first group session parameters is different from the S-NSSAI in the second group session parameters.
  • the SMF network element performs session control on the first group session and the second group session in the corresponding groups respectively, and when the group to which the remote UE belongs and the group to which the relay UE belongs are the same group, the first group session and the second group session are session controlled as group sessions of the same group.
  • the SMF network element can perform session control on the first group session in the corresponding group (for example, the group to which the relay UE belongs), and perform session control on the second group session in the corresponding group (for example, the group to which the remote UE belongs).
  • the SMF network element will perform session control on the first group session and the second group session according to the session management policy of the same group.
  • the SMF network element can establish a group session for the relay UE to perform group communication itself and a group session for the remote UE to access the network via the relay UE for group communication respectively according to two different group session parameters, and when the remote UE and the relay UE belong to the same group, the two group sessions can be used as group sessions of the same group for session control.
  • the SMF network element can distinguish the session establishment request initiated by the relay UE for group communication itself and the session establishment request initiated by the relay UE for group communication for the remote UE according to the two different group session parameters, so as to respectively establish a group session for the relay UE to perform group communication itself and a group session for the remote UE to perform group communication, thereby avoiding the problem that the SMF network element cannot establish group sessions for both the relay UE and the remote UE when the relay UE and the remote UE to access the network via the relay UE belong to the same group, thereby allowing the relay UE and the remote UE to perform group communication at the same time.
  • the relay UE is a UE in the L3 network
  • the remote UE can access the core network via the relay UE in the L3 network and not via the N3IWF network element.
  • the relay UE and the remote UE can perform group communication at the same time. That is, the method provided in the embodiment of the present disclosure can solve the technical problem that in the scenario of L3 relay networking and no N3IWF network element, the relay UE and the remote UE accessing the network via the relay UE cannot perform group communication at the same time.
  • the SMF network element may determine whether the remote UE and the relay UE belong to the same group based on the first group session parameter and the second group session parameter.
  • the SMF network element can perform the following operations according to the first group session parameter, the second group session parameter and The correspondence relationship of a certain group (e.g., a VN group) determines that the remote UE and the relay UE belong to the same group (i.e., the VN group).
  • the correspondence relationship can be pre-set in the SMF network element, or can be obtained by the SMF network element from the Network Exposure Function (NEF) network element or the Policy Control Function (PCF) network element.
  • NEF Network Exposure Function
  • PCF Policy Control Function
  • the SMF network element may also determine whether the remote UE and the relay UE belong to the same group in combination with information from the relay. This is further described below in conjunction with FIG.
  • FIG2 is a flow chart of a session control method according to other embodiments of the present disclosure.
  • the method shown in FIG. 2 further includes steps 202 to 206 .
  • step 202 the SMF network element receives information from the relay UE.
  • the information from the relay UE includes a first correspondence between a first relay service code (Relay Service Code, RSC) and a second group session parameter.
  • RSC Relay Service Code
  • the first RSC may be an RSC for the remote UE to perform relay service discovery.
  • the remote UE may initiate a relay discovery process according to the first RSC to select a relay UE, wherein the first correspondence between the first RSC and the second group session parameter may be pre-set in the relay UE.
  • the first correspondence may be, for example, "second group session parameter-first RSC-second group".
  • the relay UE may, based on the first correspondence, use the second group session parameter to initiate a session establishment request to the SMF network element to request the SMF network element to establish a second group session for the remote UE to perform group communication.
  • the relay UE may report the first correspondence to the SMF network element.
  • step 204 the SMF network element determines whether the first RSC and the second RSC are the same according to the first corresponding relationship and the second corresponding relationship between the first group session parameter and the second RSC.
  • the second correspondence between the first group session parameter and the second RSC may be preset in the SMF network element, or the SMF network element may obtain the second correspondence from the NEF network element or the PCF network element.
  • the second correspondence may be, for example, "first group session parameter-second RSC-first group”.
  • the SMF network element can determine that the first RSC corresponds to the second group session parameter (i.e., the second group to which the remote UE belongs) according to the first corresponding relationship; the SMF network element can determine that the second RSC corresponds to the first group session parameter (i.e., the first group to which the relay UE belongs) according to the second corresponding relationship; accordingly, the SMF network element can determine whether the first RSC and the second RSC are the same by comparing the first RSC in the first corresponding relationship with the second RSC in the second corresponding relationship, and then determine the first group identified by the first group session parameter. and whether the second group identified by the second group session parameter is the same (ie, determining whether the relay UE and the remote UE belong to the same group).
  • the SMF network element determines that the remote UE and the relay UE belong to the same group when the first RSC and the second RSC are the same.
  • the SMF network element can determine that the first group identified by the first group session parameter and the second group identified by the second group session parameter are the same group, that is, it can be determined that the relay UE and the remote UE belong to the same group, so that the first group session and the second group session can be subsequently controlled as group sessions of the same group according to the first correspondence and the second correspondence.
  • the SMF network element can determine that the first group identified by the first group session parameter and the second group identified by the second group session parameter are different, that is, it can be determined that the relay UE and the remote UE do not belong to the same group, so that the first group session and the second group session can be subsequently treated as group sessions of different groups for separate session control according to the first correspondence and the second correspondence.
  • the SMF network element can determine whether the relay UE and the remote UE belong to the same group by determining that the RSC corresponding to the first group session parameter and the RSC corresponding to the second group session parameter are the same. In this way, by using the same RSC to make different group session parameters of the same group correspond to each other, the SMF network element can determine that the relay UE and the remote UE belong to the same group based on the first group session parameter and the second group session parameter corresponding to the same RSC, thereby ensuring that the SMF network element can perform session control on the established first group session and the second group session as group sessions of the same group, thereby improving the reliability of group communication between the relay UE and the remote UE.
  • the SMF network element may determine the group to which the remote UE belongs and the group to which the relay UE belongs based on the first group session parameter and the second group session parameter. For example, the SMF network element may determine that the group to which the relay UE belongs is the first group identified by the first group session parameter based on the correspondence between the group session parameter and the group, and the SMF network element may determine that the group to which the remote UE belongs is the second group identified by the second group session parameter based on the correspondence between the group session parameter and the group; for another example, the correspondence between the group session parameter, the RSC and the group may be pre-set in the SMF network element.
  • the SMF network element may determine that the group to which the remote UE belongs is the second group corresponding to the first RSC when the group session parameter is the second group session parameter and the RSC is the first RSC used by the remote UE for relay service discovery.
  • NAPT Network Address Port Transfer
  • the relay UE allocates the relay UE's own IP address to each of the multiple remote UEs through NAPT.
  • the relay UE will also allocate a port number to the multiple remote UEs one by one, and then each remote UE will use the combination of the relay UE's IP address and the allocated port number for subsequent service access.
  • the port number used by the remote UE in the process of subsequent service access may not be the original port number when the service access was initiated, resulting in the remote UE's uplink data packets being unable to be correctly forwarded when accessing some services using specific port numbers, resulting in low reliability of remote UE service implementation.
  • FIG3 is a flow chart of a session control method according to yet other embodiments of the present disclosure.
  • the method shown in FIG. 3 further includes steps 302 to 304 .
  • step 302 the Direct Discovery Name Management Function (DDNMF) network element receives an address allocation request from the relay UE.
  • DDNMF Direct Discovery Name Management Function
  • the address allocation request carries the IP address of the relay UE and the identifier of each remote UE in the multiple remote UEs corresponding to the relay UE.
  • Multiple remote UEs corresponding to the relay UE means that the multiple remote UEs all access the network through the relay UE.
  • the address allocation request from the relay UE may be one or more.
  • one address allocation request from the relay UE may carry the IP address of the relay UE and the identifier of each remote UE in multiple remote UEs, that is, the relay UE may request to allocate IP addresses for multiple remote UEs by sending one address allocation request;
  • each of the multiple address allocation requests from the relay UE may carry the IP address of the relay UE and the identifier of a remote UE, that is, the relay UE may request to allocate IP addresses for multiple remote UEs respectively by sending multiple address allocation requests.
  • the IP address of the relay UE can be allocated by the SMF network element or the user plane function (UPF) network element when the relay UE accesses the network through the NR interface.
  • UPF user plane function
  • step 304 the DDNMF network element sends multiple IP addresses allocated to multiple remote UEs to the relay UE.
  • the multiple IP addresses allocated to the multiple remote UEs are different from each other.
  • the two IP addresses allocated to the two remote UEs corresponding to the relay UE may be 128.16.10.7 and 123.16.10.8 respectively.
  • the relay UE may forward the received multiple IP addresses to multiple remote ChengUE.
  • the DDNMF network element sends multiple different IP addresses allocated to multiple remote UEs accessing the network through the relay UE to the relay UE according to the address allocation request from the relay UE.
  • the relay UE can distinguish the multiple remote UEs according to the multiple IP addresses, and there is no need to assign an additional port number to each remote UE. That is, after accessing the network, each remote UE can retain the original port number when initiating service access, avoiding the impact of the change of the port number on the uplink data packet forwarding of the remote UE, thereby improving the reliability of the remote UE service implementation.
  • the DDNMF network element allocates addresses to remote UEs instead of the relay UE performing NAPT to allocate addresses to remote UEs. This can not only reduce changes to the existing network architecture, but also reduce performance requirements for the relay UE, which is conducive to the implementation of relay services.
  • each remote UE can access the core network via a relay UE in the L3 network.
  • the reliability of remote UE service implementation in the L3 relay networking scenario can be improved, that is, the technical problem that the remote UE cannot implement some services in the L3 relay networking scenario, resulting in low reliability of remote UE service implementation, can be solved.
  • the IP address of each remote UE may be an IPv4 address, that is, the IP address allocated by the DDNMF network element to each remote UE may be an IPv4 address. In this way, the impact of the change of the port number on the forwarding of uplink data packets of remote UEs that do not support IPv6 addresses but support IPv4 addresses can be avoided, thereby improving the reliability of such remote UE service implementation.
  • the IP address of each remote UE that accesses the network via the relay UE may be in the same network segment as the IP address of the relay UE.
  • the IP address of the relay UE may be 128.16.10.6
  • the three IP addresses allocated by the DDNMF network element to the three remote UEs that access the network via the relay UE may be 128.16.10.7, 128.16.10.8, and 128.16.10.9, respectively.
  • each of the multiple IP addresses allocated to multiple remote UEs is different from the IP address of the relay UE.
  • the address pool used by the DDNMF network element to allocate addresses to the remote UE can be different from the address pool used by the SMF network element and the UPF network element to allocate addresses to the relay UE, thereby making the IP address of the relay UE allocated by the SMF network element or the UPF network element and the multiple IP addresses allocated by the DDNMF network element to the multiple remote UEs different from each other.
  • the relay UE when receiving a downlink data packet from the data network, the relay UE can determine whether it needs to be forwarded to the corresponding remote UE based on the IP address of the downlink data packet, thereby improving the remote UE's reception efficiency.
  • the reliability of downlink data packets is improved, thereby further improving the reliability of remote UE service implementation.
  • the SMF network element may receive the IP address of the remote UE sent by the relay UE, wherein the IP address of the remote UE is different from the IP address of the relay UE.
  • the SMF network element can receive session context update information of the relay UE from the DDNMF network element, and the session context update information includes the correspondence between the IP address of the relay UE and the IP address of the remote UE.
  • the SMF network element can not only distinguish the uplink and downlink data packets of multiple remote UEs, but also determine that the corresponding relay UE forwards the uplink and downlink data packets of multiple remote UEs, that is, it can ensure that the SMF network element can correctly route the uplink and downlink data packets of the remote UE, thereby further improving the reliability of the remote UE service implementation.
  • the SMF network element may construct a session control policy including a group session forwarding policy by treating the first group session and the second group session as group sessions of the same group based on the session context update information, and construct a group session forwarding plane of the same group together with the UPF network element.
  • the group session forwarding plane may include a session forwarding path between SMF network elements or UPF network elements serving the same group to which the relay UE and the remote UE belong, and the session control policy of the same group to which the relay UE and the remote UE belong may also include a Quality of Service (QOS) policy.
  • QOS Quality of Service
  • the SMF network element can update the forwarding table of the UPF network element according to the session context update information.
  • the updated forwarding table in the UPF network element also includes the correspondence between the IP address of the relay UE and the multiple IP addresses allocated to the multiple remote UEs. For example, in the case where the downlink data packet of the remote UE arrives at the UPF network element, the UPF network element can forward the downlink data packet of the remote UE to the corresponding relay UE according to the updated forwarding table, so that the relay UE correctly forwards the downlink data packet to the remote UE, that is, the UPF network element can correctly forward the data packet of the remote UE according to the updated forwarding table, so that the remote UE can interact with the data network.
  • the UPF network element can also distinguish the uplink and downlink data packets of multiple remote UEs and can determine that the corresponding relay UE will forward the uplink and downlink data packets of multiple remote UEs. That is, it can ensure that the UPF network element can correctly route the uplink and downlink data packets of the remote UE, thereby further improving the reliability of the remote UE service implementation.
  • FIG4 is a flow chart of a session control method according to some further embodiments of the present disclosure.
  • the SMF network element receives a first session establishment request from the relay UE and establishes a first group session for the relay UE.
  • the first session establishment request carries a first group session parameter
  • the first group session parameter can identify The group to which the relay UE belongs.
  • the first group session may be a VN group session
  • the first group session parameters may include DNN and S-NSSAI to identify the VN group to which the relay UE belongs.
  • the SMF network element receives a second session establishment request from the relay UE, and establishes a second group session for the relay UE for group communication with the remote UE.
  • the second session establishment request carries a second group session parameter, and the second group session parameter is different from the first group session parameter.
  • the second group session may be a VN group session
  • the second group session parameters may include a DNN and an S-NSSAI to identify the VN group to which the remote UE belongs.
  • the DNN in the first group session parameters is different from the DNN in the second group session parameters; and/or the S-NSSAI in the first group session parameters is different from the S-NSSAI in the second group session parameters.
  • step 406 the SMF network element receives information from the relay UE.
  • the information from the relay UE includes a first correspondence between the first RSC and the second group session parameter.
  • step 408 the SMF network element determines whether the first RSC and the second RSC are the same according to the first corresponding relationship and the second corresponding relationship between the first group session parameter and the second RSC.
  • step 410 the SMF network element determines that the remote UE and the relay UE belong to the same group when the first RSC and the second RSC are the same.
  • the SMF network element determines that the remote UE and the relay UE do not belong to the same group.
  • step 412 the DDNMF network element receives an address allocation request from the relay UE.
  • the address allocation request may carry the IP address of the relay UE and the identifier of the remote UE.
  • the relay UE may support the Dynamic Host Configuration Protocol (DHCP) proxy function. After receiving the address allocation request from the remote UE, the relay UE may send an address allocation request to the DDNMF network element by executing the DHCP proxy function to request the DDNMF network element to allocate an IP address to the remote UE.
  • DHCP Dynamic Host Configuration Protocol
  • step 414 the DDNMF network element sends the IP address allocated to the remote UE to the relay UE.
  • the DDNMF network element may support a DHCP server function to allocate an IP address to a remote UE from a pre-set address pool.
  • the IP address of the remote UE may be different from the IP address of the relay UE.
  • step 416 the relay UE sends the IP address allocated by the DDNMF network element to the remote UE to the remote UE.
  • the remote UE1 or the remote UE2 may provide the corresponding QOS rules to the relay UE through the L2 link modification process.
  • the relay UE may initiate a session modification process to convert the data packets of the remote UE1 or the remote UE2 into corresponding QOS flows, thereby implementing QOS control of the remote UE1 or the remote UE2.
  • step 418 the DDNMF network element sends the session context update information of the relay UE to the SMF network element.
  • the session context update information of the relay UE includes the correspondence between the IP address of the relay UE and the IP address of the remote UE.
  • the SMF network element constructs a session control policy based on the session context update information, treating the first group session and the second group session as group sessions of the same group.
  • the session control policy includes a group session forwarding policy.
  • the SMF network element updates the forwarding table and session control execution rules of the UPF network element according to the session context update information.
  • the UPF network element may forward data packets of the remote UE according to the updated forwarding table so that the remote UE can access the data network.
  • the session control method may include one or more steps shown in FIG. 4 .
  • FIG5 is a schematic diagram of the structure of an SMF network element according to some embodiments of the present disclosure.
  • the SMF network element 500 includes a session establishment module 501 and a session control module 502.
  • the session establishment module 501 can be configured to establish a first group session for the relay UE in response to a first session establishment request from the relay UE, the first session establishment request carrying a first group session parameter; and to establish a second group session for the relay UE for group communication with the remote UE in response to a second session establishment request from the relay UE, the second session establishment request carrying a second group session parameter, and the second group session parameter is different from the first group session parameter.
  • the session control module 502 may be configured to perform session control on the first group session and the second group session in corresponding groups respectively, and to perform session control on the first group session and the second group session as group sessions of the same group when the remote UE and the relay UE belong to the same group.
  • the SMF network element 500 may also include other modules that perform the above-mentioned other operations.
  • FIG6 is a schematic diagram of the structure of an SMF network element according to other embodiments of the present disclosure.
  • the SMF network element 600 includes a memory 601 and a processor 602 coupled to the memory 601, and the processor 602 is configured to execute the method of any one of the aforementioned embodiments based on the instructions stored in the memory 601.
  • the memory 601 may include, for example, a system memory, a fixed non-volatile storage medium, etc.
  • the system memory may store, for example, an operating system, an application program, a boot loader, and other programs.
  • the SMF network element 600 may also include an input/output interface 603, a network interface 604, a storage interface 605, etc. These interfaces 603, 604, 605, and the memory 601 and the processor 602 may be connected, for example, via a bus 606.
  • the input/output interface 603 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen.
  • the network interface 604 provides a connection interface for various networked devices.
  • the storage interface 605 provides a connection interface for external storage devices such as SD cards and USB flash drives.
  • FIG. 7 is a schematic diagram of the structure of a conversation control system according to some embodiments of the present disclosure.
  • a session control system 700 includes an SMF network element 701 of any one of the above embodiments (for example, the SMF network element 701 may be the SMF network element 500/600) and a DDNMF network element 702.
  • the DDNMF network element 702 may be configured to receive an address allocation request from the relay UE, and send the remote UE's IP address allocated to the remote UE to the relay UE, wherein the address allocation request carries the relay UE's IP address and the remote UE's identifier.
  • the session control system 700 may further include a relay UE 703 of any of the above embodiments.
  • the relay UE 703 may be configured to send a first session establishment request and a second session establishment request to the SMF network element 701 , and send an address allocation request to the DDNMF network element 702 .
  • the embodiments of the present disclosure further provide a computer-readable storage medium, including computer program instructions, which implement the method of any one of the above embodiments when executed by a processor.
  • the embodiments of the present disclosure further provide a computer program product, including a computer program, wherein when the computer program is executed by a processor, the method of any one of the above embodiments is implemented.
  • the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may be implemented in a completely hardware embodiment, a completely software embodiment, or a combination of software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • a computer-usable non-transitory storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.
  • These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

La présente divulgation se rapporte au domaine technique des communications, et concerne un procédé et un système de commande de session, et un élément de réseau de fonction de gestion de session (SMF). Le procédé comprend les étapes suivantes : en réponse à une première demande d'établissement de session provenant d'un équipement utilisateur (EU) relais, un élément de réseau SMF établit une première session de groupe pour l'EU relais, la première demande d'établissement de session portant un premier paramètre de session de groupe ; en réponse à une seconde demande d'établissement de session provenant de l'EU relais, l'élément de réseau SMF établit, pour l'EU relais, une seconde session de groupe pour permettre à un EU distant d'effectuer une communication de groupe, la seconde demande d'établissement de session portant un second paramètre de session de groupe, et le second paramètre de session de groupe étant différent du premier paramètre de session de groupe ; l'élément de réseau SMF effectue respectivement une commande de session sur la première session de groupe et la seconde session de groupe dans des groupes correspondants, et dans un cas où l'EU distant et l'EU relais appartiennent à un même groupe, effectue une commande de session sur la première session de groupe et la seconde session de groupe en tant que sessions de groupe du même groupe.
PCT/CN2023/117531 2022-12-01 2023-09-07 Procédé et système de commande de session, et élément de réseau smf WO2024114022A1 (fr)

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