US 12,250,033 B2
Imbalance compensation for uplink (UL)—multiple-input and multiple-output (MIMO) transmissions
Lijie Zhang, Beijing (CN); Zhiwei Wang, Beijing (CN); and Lakshmi N. Kavuri, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Dec. 19, 2023, as Appl. No. 18/544,802.
Application 18/544,802 is a continuation of application No. 17/903,867, filed on Sep. 6, 2022, granted, now 11,888,552.
Prior Publication US 2024/0129001 A1, Apr. 18, 2024
Int. Cl. H04B 7/0413 (2017.01); H04B 7/06 (2006.01); H04B 17/336 (2015.01); H04W 72/21 (2023.01); H04W 72/54 (2023.01)
CPC H04B 7/0413 (2013.01) [H04B 7/0632 (2013.01); H04B 17/336 (2015.01); H04W 72/21 (2023.01); H04W 72/54 (2023.01)] 20 Claims
OG exemplary drawing
 
8. A method for compensating for an imbalance between a first uplink (UL)-multiple-input and multiple-output (MIMO) transport stream and a second UL-MIMO transport stream, the method comprising:
determining, by a user equipment (UE), one or more first parameters, characteristics, or attributes of a radio link based upon a first downlink (DL)-MIMO transport stream and a second DL-MIMO transport stream;
estimating, by the UE, one or more second parameters, characteristics, or attributes of the radio link for the first UL-MIMO transport stream and the second UL-MIMO transport stream based upon the first DL-MIMO transport stream and the second DL-MIMO transport stream, respectively;
estimating, by the UE, a first signal-to-noise ratio (SNR) of the first UL-MIMO transport stream and a second SNR of the second UL-MIMO transport stream based upon the one or more second parameters, characteristics, or attributes of the radio link;
comparing, by the UE, the first SNR and the second SNR to determine that the imbalance is present between the first UL-MIMO transport stream and the second UL-MIMO transport stream;
adjusting, by the UE, a first transmit power of the first UL-MIMO transport stream or a second transmit power of the second UL-MIMO transport stream to compensate for the imbalance; and
transmitting, by the UE, the first UL-MIMO transport stream and the second UL-MIMO transport stream over the radio link.