# US 11,310,843 B2 · PDU session establishment method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,843 B2 - Document ID: US11310843B2 - Status: Granted - Kind: B2 - Application number: 16/977,307 - Filed: 2019-03-11 - Published: 2021-01-07 - Granted: 2022-04-19 - Earliest claimed: 2018-03-13 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiaojuan Li; Haorui Yang; Hui Jin; Guowei Ouyang; Fenghui Dou; Xiaoyan Duan - Web page: https://patentgrep.com/patent/US11310843B2 ## CPC - H04W 76/10: Connection setup - H04W 76/12: Setup of transport tunnels - H04L 47/803: {Application aware} - H04W 36/0066: {of control information between different types of networks in order to establish a new radio link in the target network} - H04W 60/005: {Multiple registrations, e.g. multihoming} - H04W 48/18: Selecting a network or a communication service - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract This application discloses a PDU session establishment method and apparatus. The method includes: receiving, by a terminal device in a process of establishing a PDN connection in a first system, an access type that is sent by a core network device and that corresponds to the PDN connection in a second system; and when the terminal device moves to the second system, establishing, by the terminal device, a PDU session in the second system via an access network indicated by the access type, where the PDU session is associated with the PDN connection. Implementation of the present invention can increase a success rate of establishing a PDU session. ## Claims ### Claim 1 A PDU session establishment method, comprising: receiving, by a terminal device in a process of establishing a public data network (PDN) connection in a first system, an access type that is sent by a core network device and that corresponds to the PDN connection in a second system; when the terminal device moves to the second system, establishing, by the terminal device, a protocol data unit (PDU) session in the second system via an access network indicated by the access type, wherein the PDU session is associated with the PDN connection; determining, by the terminal device, to use a terminal device route selection policy (URSP) rule corresponding to an application of the PDU session; and when a parameter of the PDU session does not match the URSP rule of the application, skipping, by the terminal device, binding the application to the PDU session, or releasing the PDU session. ### Claim 2 (depends on 1) The method according to claim 1, wherein the receiving, by a terminal device in a process of establishing a PDN connection in a first system, an access type that is sent by a core network device and that corresponds to the PDN connection in a second system comprises: receiving, by the terminal device, a protocol configuration option (PCO) from the core network device, wherein the PCO carries the access type supported by the PDN connection in the second system. ### Claim 3 (depends on 2) The method according to claim 2, wherein the access type comprises 3rd Generation Partnership Project (3GPP) access and non-3GPP access. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: registering, by the terminal device, with the second system via the access network indicated by the access type. ### Claim 5 (depends on 4) The method according to claim 4, wherein the terminal device registers with the second system via a 3GPP access network; the terminal device registers with the second system via a non-3GPP access network; or the terminal device registers with the second system via both a 3GPP access network and a non-3GPP access network. ### Claim 6 (depends on 1) A non-transitory computer-readable storage medium, comprising an instruction, wherein when the instruction is run on a PDU session establishment apparatus, the PDU session establishment apparatus is enabled to perform the method according to claim 1. ### Claim 7 A PDU session establishment apparatus, comprising: a receiver, configured to receive in a process of establishing a PDN connection in a first system, an access type that is sent by a core network device and that corresponds to the PDN connection in a second system; and a processor, configured to: when a terminal device moves to the second system, establish a PDU session in the second system via an access network indicated by the access type, wherein the PDU session is associated with the PDN connection; determine to use a terminal device route selection policy (URSP) rule corresponding to an application of the PDU session; and when a parameter of the PDU session does not match the URSP rule of the application, skip binding the application to the PDU session or release the PDU session. ### Claim 8 (depends on 7) The apparatus according to claim 7, wherein that a processor is configured to receive, in a process of establishing a PDN connection in a first system, an access type that is sent by a core network device and that corresponds to the PDN connection in a second system comprises: receiving a protocol configuration option (PCO) sent by the core network device, wherein the PCO carries the access type supported by the PDN connection in the second system. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the access type comprises 3GPP access and non-3GPP access. ### Claim 10 (depends on 7) The apparatus according to claim 7, wherein the processor is further configured to: register with the second system via the access network indicated by the access type. ### Claim 11 (depends on 10) The apparatus according to claim 10, wherein that the processor is configured to register with the second system via the access network indicated by the access type comprises: registering with the second system via a 3GPP access network; registering with the second system via a non-3GPP access network; or registering with the second system via both a 3GPP access network and a non-3GPP access network.