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1. (WO2017193262) HANDLING PACKET ACKNOWLEDGMENTS DURING TUNE-AWAYS ON MOBILE DEVICES

Pub. No.:    WO/2017/193262    International Application No.:    PCT/CN2016/081423
Publication Date: Fri Nov 17 00:59:59 CET 2017 International Filing Date: Tue May 10 01:59:59 CEST 2016
IPC: H04L 1/18
H04W 36/02
Applicants: QUALCOMM INCORPORATED
ZHENG, Ruiming
GUO, Jiming
XING, Rulin
ZHU, Xipeng
JIN, Lizhong
LIU, Huichun
Inventors: ZHENG, Ruiming
GUO, Jiming
XING, Rulin
ZHU, Xipeng
JIN, Lizhong
LIU, Huichun
Title: HANDLING PACKET ACKNOWLEDGMENTS DURING TUNE-AWAYS ON MOBILE DEVICES
Abstract:
Various methods for managing TCP communications in a mobile communication device may include determining whether there is an upcoming tune-away from a first RAT on the mobile communication device to a second RAT on the mobile communication device, adding a first timestamp to a TCP packet for transmission before the tune-away begins in response to determining that there is an upcoming tune-away from the first RAT to the second RAT, transmitting the TCP packet to a first network, performing the tune-away from the first RAT to the second RAT, triggering a retransmission time out on the first RAT, receiving a TCP acknowledgement (ACK) from the first network, in which the TCP ACK includes a second timestamp, determining whether the TCP ACK corresponds to the TCP packet, and restoring a prior congestion window value of the first RAT in response to determining that the TCP ACK corresponds to the TCP packet.