US 12,219,540 B2
Systems and methods to include demodulation reference signal bundling in multi-subscriber identity module devices
Akash Kumar, Hyderabad (IN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Apr. 28, 2022, as Appl. No. 17/661,173.
Prior Publication US 2023/0354279 A1, Nov. 2, 2023
Int. Cl. H04W 72/0453 (2023.01); H04W 8/18 (2009.01)
CPC H04W 72/0453 (2013.01) [H04W 8/183 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A user equipment (UE) comprising:
a first subscriber identity module (SIM) associated with a first service provider subscription and a second SIM associated with a second service provider subscription; and
a processor configured to access the first SIM and the second SIM, wherein the processor is further configured to:
operate in a Dual SIM Dual Active (DSDA) mode with respect to the first SIM and the second SIM;
control transmit operations of the first SIM and the second SIM according to a time division multiplexed (TDM) priority pattern;
perform demodulation reference signal (DMRS) bundling on the first SIM, the first SIM having a higher priority state according to the TDM priority pattern; and
switch the higher priority state to the second SIM during the DMRS bundling on the first SIM;
reduce a transmit power of the first SIM during the DMRS bundling on the first SIM, including maintaining phase continuity of the first SIM;
scale a filter output in baseband, associated with the first SIM, wherein scaling the filter output includes compensating a phase of operation of the first SIM in accordance with reducing the transmit power;
lower a power amplifier state to reduce the transmit power;
compensate a phase of operation of the first SIM in accordance with lowering the power amplifier state;
receiving information indicating a first band for use with the first SIM and a second band for use with the second SIM;
determining that the first band and the second band are incompatible with demodulation reference signal (DMRS) bundling in a Dual SIM Dual Active (DSDA) operating mode; and
informing a base station that DMRS bundling is unavailable at the UE.