# US 10,455,471 B2 · Method and user equipment for performing network selection and traffic routing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,471 B2 - Document ID: US10455471B2 - Status: Granted - Kind: B2 - Application number: 15/559,796 - Filed: 2016-03-03 - Published: 2018-03-08 - Granted: 2019-10-22 - Earliest claimed: 2015-04-01 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyunsook Kim; Laeyoung Kim; Jinsook Ryu; Jaehyun Kim; Taehun Kim; Myungjune Youn - Web page: https://patentgrep.com/patent/US10455471B2 ## CPC - H04W 36/22: for handling the traffic - H04W 8/08: Mobility data transfer - H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions} - H04W 40/36: due to handover - H04W 48/18: Selecting a network or a communication service - H04W 74/0858: {collision detection} - H04W 76/36: for reassigning the resources associated with the released connections - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W 28/0236: {radio quality, e.g. interference, losses or delay} - H04W 36/08: Reselecting an access point - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present description discloses a method for performing network selection and traffic routing by a user equipment (UE). The method can comprise the steps of: a non-access stratum (NAS) of the UE receiving from a mobility management entity (MME) an indication, for wireless local area network (WLAN) offloadability for a first public data network (PDN) connection, and information about a network-based IP flow mobility (NBIFOM); the NAS of the UE determining whether or not a collision exists between the indication and information; the NAS of the UE deciding for a suspension of the NBIFOM on the basis of the existence of collision; and the NAS of the UE transmitting to a PDN gateway (P-GW) a message or information, notifying the suspension of the NBIFOM, on the basis of the decision for the suspension of the NBIFOM. ## Claims ### Claim 1 A method for performing network selection and traffic routing by a user equipment (UE), comprising: receiving, by a non-access stratum (NAS) of the UE from a mobility management entity (MME), first information on a wireless local area network (WLAN) offloadability for a first public data network (PDN) connection, and information on a capability to support a network-based IP flow mobility (NBIFOM); determining, by the NAS of the UE, that a conflict exists between the first information and the information on the capability to support the NBIFOM when the first information includes information representing that an offloading to a WLAN is not possible and the information on the capability of the first PDN to support the NBIFOM includes information related to mobility to the WLAN; when the conflict is determined to exist, transmitting, by the NAS of the UE to a PDN gateway (P-GW), a message for notifying a suspension of the NBIFOM; receiving a second information on WLAN offloadability for a second PDN connection and information on a capability of the second PDN to support the NBIFOM from the MME; determining whether the conflict is resolved based on the second information and the information on the capability of the second PDN to support the NBIFOM; and determining whether to resume the NBIFOM based on the determining of whether the conflict is resolved. ### Claim 2 (depends on 1) The method of claim 1, further comprising: receiving updated first information on the WLAN offloadability for the first PDN connection from the MME; receiving updated information on the capability of the first PDN connection to support the NBIFOM; determining whether the conflict is resolved based on a comparison of the updated first information and the updated information on the capability of the first PDN to support the NBIFOM; and resuming the NBIFOM when the conflict is determined to be resolved. ### Claim 3 (depends on 1) The method of claim 1, wherein the determining of whether to resume the NBIFOM includes: determining whether the conflict is resolved, and if the conflict is determined to be resolved, determining whether to resume the NBIFOM based on offloading information from an access stratum (AS) layer of the UE. ### Claim 4 (depends on 3) The method of claim 3, wherein the determining whether to resume the NBIFOM based on the offloading information from the AS layer comprises: receiving, by the AS layer of the UE, a radio access network (RAN) assistance parameter from a base station; evaluating, by the AS layer of the UE, the RAN assistance parameter; and transferring, by the AS layer of the UE to the NAS layer of the UE, the offloading information from the AS layer based on the evaluating of the RAN assistance parameter. ### Claim 5 (depends on 4) The method of claim 4, wherein when the conflict is resolved and when the offloading information from the AS layer indicates that the first PDN connection is able to be offloaded to the WLAN, resuming the NBIFOM. ### Claim 6 (depends on 4) The method of claim 4, wherein the RAN assistance parameter includes at least one of a 3GPP access threshold, a WLAN access threshold, or an offload preference indication (OPI) value. ### Claim 7 (depends on 6) The method of claim 6, wherein when both the 3GPP access threshold and the WLAN access threshold in the RAN assistance parameter are satisfied, the offloading information from the AS layer indicates that the first PDN connection is able to be offloaded to the WLAN. ### Claim 8 A user equipment (UE) for performing network selection and traffic routing, comprising: a transceiver; and a processor controlling the transceiver, wherein the processor includes an access stratum (AS) layer and a non-access stratum (NAS) layer and controls the NAS layer to perform the following NAS layer procedures, and the NAS layer procedures include: receiving, from a mobility management entity (MME), first information on wireless local area network (WLAN) offloadability for a first public data network (PDN) connection, and information on a capability of the first PDN connection to support a network-based IP flow mobility (NBIFOM); determining that conflict exists between the first information and the information on the capability to support the NBIFOM when the first information includes information representing that an offloading to a WLAN is not possible and the information on the capability of the first PDN to support the NBIFOM includes information related to mobility to the WLAN; when the conflict is determined to exist, transmitting, to a PDN gateway (P-GW), a message for notifying a suspension of the NBIFOM; and receiving a second information on WLAN offloadability for a second PDN connection and the information on the capability of the second PDN to support the NBIFOM from the MME, determining whether the conflict is resolved based on the second information and the information on the capability of the second PDN to support the NBIFOM; and determining whether to resume the NBIFOM based on the determining of whether the conflict is resolved. ### Claim 9 (depends on 8) The UE of claim 8, wherein the NAS layer procedures further include: receiving updated first information on the WLAN offloadability for the first PDN connection from the MME, receiving updated information on the capability of the first PDN to support the NBIFOM, determining that the conflict is resolved based on a comparison of the updated first information and the updated information on the capability of the first PDN to support the NBIFOM, and resuming the NBIFOM based on the determination. ### Claim 10 (depends on 8) The UE of claim 8, wherein the determining of whether to resume the NBIFOM further includes determining whether the conflict is resolved, and if the conflict is determined to be resolved, determining whether to resume the NBIFOM based on offloading information from the AS layer of the UE. ### Claim 11 (depends on 10) The UE of claim 10, wherein the processor is configured to determine whether to resume the NBIFOM based on offloading information from the AS layer based on the following AS layer procedures, and the AS layer procedures include: receiving a radio access network (RAN) assistance parameter from a base station, evaluating the RAN assistance parameter, and transferring, from the AS layer to the NAS layer of the UE, the offloading information based on based on the evaluating of the RAN assistance parameter. ### Claim 12 (depends on 11) The UE of claim 11, wherein the processor is configured to resume the NBIFOM when the conflict is resolved and when the offloading information from the AS layer indicates that the first PDN connection is able to be offloaded to the WLAN. ### Claim 13 (depends on 11) The UE of claim 11, wherein the RAN assistance parameter includes at least one of a 3GPP access threshold, a WLAN access threshold, or an offload preference indication (OPI) value. ### Claim 14 (depends on 13) The UE of claim 13, wherein when both the 3GPP access threshold and the WLAN access threshold in the RAN assistance parameter are satisfied, the offloading information from the AS layer indicates that the first PDN connection is able to be offloaded to the WLAN.