# US 10,455,472 B2 · Device and method of handling data transmissions in a wireless communication system

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- Number: US 10,455,472 B2
- Document ID: US10455472B2
- Status: Granted
- Kind: B2
- Application number: 15/839,829
- Filed: 2017-12-12
- Published: 2018-06-14
- Granted: 2019-10-22
- Earliest claimed: 2016-12-13
- Assignees: HTC Corporation
- Applicants: HTC Corporation
- Inventors: Chih-Hsiang Wu
- Web page: https://patentgrep.com/patent/US10455472B2

## CPC

- H04W 36/22: for handling the traffic
- H04W 36/0038: {of security context information}
- H04W 76/12: Setup of transport tunnels
- H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
- H04W 76/19: Connection re-establishment
- H04W 36/0064: {of control information between different access points}
- 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

A first communication device for communicating with a second communication device according to a Cellular network/wireless local area network (WLAN) Radio Level Integration with Internet Protocol Security (IPsec) Tunnel (CWIP) comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise performing a CWIP configuration and a CWIP aggregation configuration; transmitting a plurality of CWIP Encapsulation Protocol (CWIPEP) protocol data units (PDUs) over a radio bearer (RB) via a cellular connection or a WLAN to the second communication device, in response to the CWIP configuration and the CWIP aggregation configuration; performing a radio resource control (RRC) connection reestablishment or a handover; and stopping transmitting any CWIPEP PDU over the RB to the second communication device, after completing the RRC connection reestablishment or the handover.

## Claims

### Claim 1

A first base station (BS) in a network for communicating with a communication device according to a Cellular network/wireless local area network (WLAN) Radio Level Integration with Internet Protocol Security (IPsec) Tunnel (CWIP), comprising:
a storage device, for storing instructions; and
a processing circuit, coupled to the storage device, wherein the processing circuit is configured to execute the instructions of:
transmitting a CWIP configuration and a CWIP aggregation configuration to the communication device;
transmitting a plurality of CWIP Encapsulation Protocol (CWIPEP) protocol data units (PDUs) over a radio bearer (RB) via a cellular connection or a WLAN to the communication device, after transmitting the CWIP configuration and the CWIP aggregation configuration;
transmitting a Handover Request message to a second BS, to request the second BS to prepare a handover for the communication device;
receiving a Handover Request Acknowledge message from the second BS, wherein the Handover Request Acknowledge message comprises a Handover Command message indicating the communication device to perform the handover to a cell of the second BS;
transmitting the Handover Command message to the communication device; and
forwarding an IP packet associated to the RB to the second BS in response to the handover, wherein the IP packet is comprised in a CWIPEP PDU and the CWIPEP PDU is not transmitted successfully to the communication device before the communication device performs the handover.

### Claim 2 (depends on 1)

The first BS of claim 1, wherein the storage device further stores the instruction of:
not forwarding the CWIPEP PDU associated to the RB to the second BS in response to the handover, wherein the CWIPEP PDU is not transmitted successfully to the communication device.

### Claim 3 (depends on 1)

The first BS of claim 1, wherein the storage device further stores the instruction of:
forwarding the IP packet and a packet data convergence protocol (PDCP) sequence number (SN) associated to the IP packet to the second BS instead of the CWIPEP PDU.