# US 11,122,643 B2 · LWIP enhancements for reliable DRB switching > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,643 B2 - Document ID: US11122643B2 - Status: Granted - Kind: B2 - Application number: 16/086,141 - Filed: 2016-08-30 - Published: 2020-09-24 - Granted: 2021-09-14 - Earliest claimed: 2016-04-27 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Jing Zhu; Nana Zhang - Web page: https://patentgrep.com/patent/US11122643B2 ## CPC - H04W 76/22: Manipulation of transport tunnels - H04L 1/1614: {using bitmaps} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/1816: {with retransmission of the same, encoded, message} - H04L 1/1874: {Buffer management} - H04W 28/04: Error control - 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 Embodiments of LWTP (long term evolution (LTE)/wireless local area network (WLAN) radio level integration Protocol) enhancements for reliable data radio bearer (DRB) switching are disclosed. A user equipment (UE) decodes a radio resource control (RRC) connection reconfiguration message, received from an evolved NodeB (eNB), the RRC connection reconfiguration message indicting switching DRBs from a first wireless transmission mode to second wireless transmission mode, and the RRC connection reconfiguration message including an uplink (UL) status report indicating a first missing UL sequence number, the UL status report being a UL LWIP status report. The UE causes reconfiguration of the UE according to the RRC connection reconfiguration message. The UE encodes, for transmission to the eNB, a RRC connection reconfiguration complete message. The UE encodes, for retransmission over the second wireless transmission mode, lost service data unit(s) (SDU) based on the UL status report. ## Claims ### Claim 1 A non-transitory computer-readable storage medium storing program instructions executable by at least one processor of a user equipment (UE) to configure the UE to perform long term evolution (LTE) and wireless local area network (WLAN) radio level Integration using IPsec Tunnel (LWIP) communication, the program instructions causing the at least one processor to: decode a radio resource control (RRC) connection reconfiguration message, received from a base station, the RRC connection reconfiguration message indicting configuration of LWIP Encapsulation Protocol (EP) packet data units (PDUs) of a data radio bearer (DRB) with aggregation over LTE and LWIP communications; reconfigure the UE to switch DRBs according to the RRC connection reconfiguration message; encode, for transmission to the base station, an RRC connection reconfiguration complete message; and decode, LWIP encapsulation protocol (LWIPEP) PDUs of the DRB with aggregation over LTE and LWIP communications, wherein a header of a respective LWIPEP PDU of the LWIPEP PDUs includes a sequence number that is used for reordering of the PDUs. ### Claim 2 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein the communications comply with an Institute of Electrical and Electronic Engineers (IEEE) 802.11 standard. ### Claim 3 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein the sequence number is counted on a per DRB basis. ### Claim 4 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein the program instructions are further executable to cause the at least one processor to: encode second LWIPEP PDUs of a second DRB with aggregation over LTE and WLAN-LWIP communications in accordance with both LTE and the WLAN transmission mode, wherein a header of a respective second LWIPEP PDU of the second LWIPEP PDUs includes a sequence number that is used for reordering of the PDUs of the second DRB. ### Claim 5 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein the RRC connection reconfiguration message indicates a LWIP encapsulation protocol (EP) buffering timer for buffering service data units (SDUs) that are sent via a tunnel, the EP buffering timer indicating how long a SDU is held by a transmitter after being sent to the tunnel. ### Claim 6 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein a LWIP encapsulation protocol (EP) buffering timer for buffering service data units (SDUs) that are sent via a tunnel is pre-defined, the LWIP EP buffering timer indicating how long a SDU is held by a transmitter after being sent to the tunnel. ### Claim 7 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein the at least one processor comprises a baseband processor. ### Claim 8 (depends on 1) The non-transitory computer-readable storage medium of claim 1, wherein the header of the respective LWIPEP PDU is a generic routing encapsulation (GRE) header. ### Claim 9 An apparatus, comprising: at least one processor configured to cause a user equipment (UE) to perform long term evolution (LTE) and wireless local area network (WLAN) radio level Integration using IPsec Tunnel (LWIP) communication, wherein the at least one processor is further configured to: decode a radio resource control (RRC) connection reconfiguration message, received from a base station (BS), the RRC connection reconfiguration message indicting configuration of LWIP encapsulation protocol (LWIPEP) packet data units (PDUs) of a data radio bearer (DRB) with aggregation over LTE and LWIP communications; reconfigure the UE to switch DRBs according to the RRC connection reconfiguration message; encode, for transmission to the base station, an RRC connection reconfiguration complete message; and decode LWIPEP PDUs of the DRB with aggregation over LTE and LWIP communications, wherein a header of a respective LWIPEP PDU of the LWIPEP PDUs includes a sequence number that is used for reordering of the PDUs. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the sequence number is counted on a per DRB basis. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the at least one processor is further configured to cause the UE to: encode second LWIPEP PDUs of a second DRB with aggregation over LTE and WLAN-LWIP communications in accordance with both LTE and the WLAN transmission mode, wherein a header of a respective second LWIPEP PDU of the second LWIPEP PDUs includes a sequence number. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein the RRC connection reconfiguration message indicates a LWIP encapsulation protocol (EP) buffering timer for buffering service data units (SDUs) that are sent via a tunnel, the EP buffering timer indicating how long a SDU is held by a transmitter after being sent to the tunnel. ### Claim 13 (depends on 9) The apparatus of claim 9, wherein a LWIP encapsulation protocol (EP) buffering timer for buffering service data units (SDUs) that are sent via a tunnel is pre-defined, the LWIP EP buffering timer indicating how long a SDU is held by a transmitter after being sent to the tunnel. ### Claim 14 (depends on 9) The apparatus of claim 9, wherein the header of the respective LWIPEP PDU is a generic routing encapsulation (GRE) header. ### Claim 15 A user equipment (UE), comprising: wireless communication circuitry; and at least one processor coupled to the wireless communication circuitry configured to cause the UE to perform long term evolution (LTE) and wireless local area network (WLAN) radio level Integration using IPsec Tunnel (LWIP) communication, wherein the at least one processor is further configured to: decode a radio resource control (RRC) connection reconfiguration message, received from a base station (BS), the RRC connection reconfiguration message indicting configuration of LWIP encapsulation protocol (LWIPEP) packet data units (PDUs) of a data radio bearer (DRB) with aggregation over LTE and LWIP communications; reconfigure the UE to switch DRBs according to the RRC connection reconfiguration message; encode, for transmission to the base station, an RRC connection reconfiguration complete message; and decode LWIPEP PDUs of the DRB with aggregation over LTE and LWIP communications, wherein a header of a respective LWIPEP PDU of the LWIPEP PDUs includes a sequence number that is used for reordering of the PDUs. ### Claim 16 (depends on 15) The UE of claim 15, wherein the sequence number is counted on a per DRB basis. ### Claim 17 (depends on 15) The UE of claim 15, wherein the at least one processor is further configured to cause the UE to: encode second LWIPEP PDUs of a second DRB with aggregation over LTE and WLAN-LWIP communications in accordance with both LTE and the WLAN transmission mode, wherein a header of a respective second LWIPEP PDU of the second LWIPEP PDUs includes a sequence number. ### Claim 18 (depends on 15) The UE of claim 15, wherein the RRC connection reconfiguration message indicates a LWIP encapsulation protocol (EP) buffering timer for buffering service data units (SDUs) that are sent via a tunnel, the EP buffering timer indicating how long a SDU is held by a transmitter after being sent to the tunnel. ### Claim 19 (depends on 15) The UE of claim 15, wherein a LWIP encapsulation protocol (EP) buffering timer for buffering service data units (SDUs) that are sent via a tunnel is pre-defined, the LWIP EP buffering timer indicating how long a SDU is held by a transmitter after being sent to the tunnel. ### Claim 20 (depends on 15) The UE of claim 15, wherein the header of the respective LWIPEP PDU is a generic routing encapsulation (GRE) header.