US 12,219,650 B2
Apparatuses and methods for multi-radio access technology (RAT) coordination
Chien-Chun Huang-Fu, Hsinchu (TW); Chun-Fan Tsai, Hsinchu (TW); I-Kang Fu, Hsinchu (TW); and Chin-Chia Chang, Hsinchu (TW)
Assigned to MediaTek Inc., (TW)
Filed by MEDIATEK INC., Hsinchu (TW)
Filed on Jul. 31, 2023, as Appl. No. 18/362,546.
Application 18/362,546 is a continuation of application No. 17/123,296, filed on Dec. 16, 2020, granted, now 11,751,279.
Claims priority of provisional application 62/957,955, filed on Jan. 7, 2020.
Prior Publication US 2023/0380008 A1, Nov. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 76/30 (2018.01); H04W 36/00 (2009.01); H04W 36/14 (2009.01); H04W 76/27 (2018.01)
CPC H04W 76/30 (2018.02) [H04W 36/00224 (2023.05); H04W 36/144 (2023.05); H04W 76/27 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A User Equipment (UE), comprising:
a wireless transceiver, configured to perform wireless transmission and reception to and from a first service network utilizing a first Radio Access Technology (RAT) via a first subscriber identity module (SIM) or a second service network utilizing a second RAT via a second SIM; and
a controller, configured to:
connect to the first service network using the first SIM,
determine that the UE is required to switch from the first service network to the second service network,
send an indicator of a connection release request to the first service network via the wireless transceiver in response to leaving the first service network for the second service network,
start a timer upon sending the indicator, and
release a Radio Resource Control (RRC) connection with the first service network upon either expiration of the timer or receipt of an RRC connection release message from the first service network before expiration of the timer.