# US 2019/0380104 A1 · Network registration and network slice selection system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0380104 A1 - Document ID: US20190380104A1 - Status: Published application - Kind: A1 - Application number: 16/550,398 - Filed: 2019-08-26 - Published: 2019-12-12 - Earliest claimed: 2017-02-06 - Assignees: Huawei Technologies Co., Ltd. - Inventors: Sophie VRZIC; Jaya RAO - Web page: https://patentgrep.com/patent/US20190380104A1 ## CPC - H04W 60/04: using triggered events - H04W 28/26: Resource reservation - H04W 48/17: {Selecting a data network PoA [Point of Attachment]} - H04W 48/18: Selecting a network or a communication service - H04W 60/002: {Registration for requesting network slices} - H04W 76/12: Setup of transport tunnels - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 48/16: Discovering, processing access restriction or access information - H04W 76/11: Allocation or use of connection identifiers - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Implementations of a registration procedure are described. The registration procedure includes a Access and Mobility Function (AMF) selection procedure and a Session Management Function (SMF) selection procedure. The AMF receives a Non-Access Stratum (NAS) registration request pertaining a User Equipment (UE). At least partially in response to the registration request: the AMF registers the UE on the network; and establishes a Protocol Data Unit (PDU) session for the UE. The AMF transmits a registration response to the UE. An access node of the network receives a Radio Resource Control (RRC) registration request from a User Equipment (UE). At least partially in response to the registration request: The access node selects an AMF, and forwards a corresponding Non-Access Stratum (NAS) registration request to the selected AMF. The NAS registration request includes PDU session request information pertaining to the UE. ## Claims ### Claim 1 A method comprising: receiving, by an access and mobility function (AMF), a registration request sent by a user equipment (UE), the registration request comprising: Network Slice Selection Assistance Information (NSSAI) including at least one Single Network Slice Selection Assistance Information (S-NSSAI), the at least one S-NSSAI identifying a network slice requested by the UE; and indicator for one or more Protocol Data Unit (PDU) sessions associated with the at least one S-NSSAI, wherein the indicator for each of the one or more PDU sessions indicates a PDU session that is to be activated for the network slice identified by the at least one S-NSSAI; and transmitting, by the AMF to a session management function (SMF) associated with the network slice identified by the at least one S-NSSAI, a request to establish the one or more PDU sessions that are to be activated for the network slice identified by the at least one S-NSSAI. ### Claim 2 (depends on 1) The method of claim 1, further comprising: receiving, by the AMF, a PDU session establishment response sent by the SMF, the PDU session establishment response indicating which of the one or more PDU sessions were established and activated for the network slice identified by the at least one S-NSSAI; and transmitting, by the AMF, a registration response to the UE, the registration response comprising the PDU session establishment response. ### Claim 3 (depends on 2) The method of claim 2, wherein the registration response further comprises an identifier of the SMF associated with the network slice identified by the at least one S-NSSAI. ### Claim 4 (depends on 2) The method of claim 2, wherein registration requested is received from one of: an access point of the network associated with the UE and a second AMF of the network and the AMF is associated with the at least one S-NSSAI. ### Claim 5 (depends on 1) The method of claim 1, wherein the registration request comprises: a plurality of S-NSSAIs; and indicator for one or more Protocol Data Unit (PDU) session associated with each S-NSSAI, wherein each S-NSSAI identifies a network slice requested by the UE, and wherein the indicator for each of the one or more PDU session associated with each respective S-NSSAI indicates a PDU session that is to be activated for the network slice identified by the respective S-NSSAI. ### Claim 6 (depends on 5) The method of claim 5, further comprising: transmitting, by the AMF to a SMF associated with the slice/service type identified by each respective S-NSSAI, a request to establish the one or more PDU sessions that are to be activated for the network slice identified by the respective S-NSSAI ### Claim 7 (depends on 6) The method of claim 6, further comprising: receiving, by the AMF, a PDU session establishment response sent by each respective SMF associated with the network slice identified by the respective S-NSSAI, the PDU session establishment response sent by each respective SMF indicating which of the one or more PDU sessions were established and activated for the network slice identified by the respective S-NSSAI. ### Claim 8 (depends on 7) The method of claim 7, further comprising: transmitting, by the AMF, a registration response comprising the S-NSSAIs that have been accepted and the PDU session establishment response received from each respective SMF associated with the network slice identified by a S-NSSAI. ### Claim 9 (depends on 1) The method of claim 1, wherein each of the one or more PDU sessions is always-on PDU sessions. ### Claim 10 A computing system comprising: a processor; and a non-transitory computer-readable medium storing computer-readable instructions which, when executed by the processor cause the computing system to implement an access and mobility function that is configured to: receiving, by an access and mobility function (AMF), a registration request sent by a user equipment (UE), the registration request comprising: Network Slice Selection Assistance Information (NSSAI) including at least one Single Network Slice Selection Assistance Information (S-NSSAI), the at least one S-NSSAI identifying a network slice requested by the UE; and indicator for one or more Protocol Data Unit (PDU) session associated with the at least one S-NSSAI, wherein the indicator for each of the one or more PDU session indicates a PDU session that is to be activated for the slice/service type identified by at least one S-NSSAI; and transmit to a session management function (SMF) associated with the network slice identified by the at least one S-NSSAI, a request to establish the one or more PDU sessions to be activated for network slice identified by the at least one S-NSSAI. ### Claim 11 (depends on 10) The computing system of claim 10, wherein the AMF is further configured to: receive a PDU session establishment response sent by the SMF, the PDU session establishment response indicating which of the one or more PDU sessions were activated for the network slices identified by the at least one S-NSSAI; and transmit a registration response to the UE, the registration response comprising the PDU session establishment response. ### Claim 12 (depends on 11) The computing system of claim 11, wherein the registration response further comprises an identifier of the SMF associated with the network slice identified by the at least one S-NSSAI. ### Claim 13 (depends on 11) The computing system of claim 11, wherein registration requested is received from one of: an access point of the network associated with the UE and a second AMF of the network and the AMF is associated with the at least one S-NSSAI. ### Claim 14 (depends on 11) The computing system of claim 11, wherein the registration request comprises: a plurality of S-NSSAIs; and indicator for one or more Protocol Data Unit (PDU) session associated with each S-NSSAI, wherein each S-NSSAI identifies a network slice requested by the UE, and wherein the indicators for each of the one or more PDU session identifiers for each respective S-NSSAI indicates a PDU session that is to be activated for the network slice identified by the respective S-NSSAI. ### Claim 15 (depends on 14) The computing system of claim 14, wherein the AMF is further configured to: transmit to a SMF associated with the networks slice identified by each respective S-NSSAI, a request to establish the one or more PDU sessions that are to be activated for the network slice identified by the respective S-NSSAI. ### Claim 16 (depends on 15) The computing system of claim 15, wherein the AMF is further configured to: receive a PDU session establishment response sent by each respective SMF associated with the network slice identified by the respective S-NSSAI, the PDU session establishment response sent by each respective SMF indicating which of the one or more PDU sessions were established for the slice/service type identified by the respective S-NSSAI. ### Claim 17 (depends on 16) The computing system of claim 16, wherein the AMF is further configured to: transmit a registration response comprising the S-NSSAIs that have been accepted and the PDU session establishment response received from each respective SMF associated with the network slice identified by a S-NSSAI ### Claim 18 (depends on 10) The computing system of claim 10, wherein each of the one or more PDU sessions is always-on PDU sessions. ### Claim 19 A non-transitory computer-readable medium storing computer-readable instructions which, when executed by a processor of a computing system to cause the computing system to implement an access and mobility (AMF) function that is configured to: receive a registration request sent by a user equipment (UE), the registration request comprising: Network Slice Selection Assistance Information (NSSAI) including at least one Single Network Slice Selection Assistance Information (S-NSSAI), the at least one S-NSSAI identifying a slice/service type requested by the UE; and indicator for one or more Protocol Data Unit (PDU) session associated with the at least one S-NSSAI, wherein the indicator for each of the one or more PDU session indicates a PDU session that is to be activated for the network slice identified by at least one S-NSSAI; and transmit to a session management function (SMF) associated with the network slice identified by the at least one S-NSSAI, a request establish the one or more PDU sessions that are to be activated for the network slice identified by at least one S-NSSAI. ### Claim 20 (depends on 19) The non-transitory computer-readable medium of claim 19, wherein the AMF is further configured to: receive a PDU session establishment response sent by the SMF, the PDU session establishment response indicating which of the one or more PDU sessions were activated for the network slice identified by the at least one S-NSSAI; and transmit a registration response to the UE, the registration response comprising the PDU session establishment response.