Optimized handling for transmit power backoffs to enable uplink transmit power boost
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may apply a per chain transmit power split to a cumulative maximum transmit power level (MTPL). The UE may calculate a value associated with a conditional power backoff, wherein the value associated with the conditional power backoff is calculated after the per chain transmit power split is applied to the cumulative MTPL. The UE may transmit, using multiple transmit chains, an uplink signal using a final transmit power level, wherein the final transmit power level is based on a value of the cumulative MTPL after the per chain transmit power split is applied to the cumulative MTPL and the calculated value associated with the conditional power backoff. Numerous other aspects are described.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
applying a per chain transmit power split to a cumulative maximum transmit power level (MTPL);
calculating a value associated with a conditional power backoff, wherein the value associated with the conditional power backoff is calculated after the per chain transmit power split is applied to the cumulative MTPL, and wherein the conditional power backoff has a non-zero value that is applied to the cumulative MTPL based on the cumulative MTPL failing to satisfy a threshold associated with the conditional power backoff after the per chain transmit power split is applied to the cumulative MTPL; and
transmitting, using multiple transmit chains, an uplink signal using a final transmit power level, wherein the final transmit power level is based on a value of the cumulative MTPL after the per chain transmit power split is applied to the cumulative MTPL and the calculated value associated with the conditional power backoff.
2 . The method of claim 1 , further comprising:
applying a mandatory transmit backoff to the cumulative MTPL prior to calculating the value associated with the conditional power backoff, wherein the final transmit power level is further based on the value of the cumulative MTPL after the mandatory transmit backoff is applied to the cumulative MTPL.
3 . The method of claim 2 , wherein the conditional power backoff has a zero or null value based on the cumulative MTPL satisfying a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
4 . The method of claim 2 , wherein the conditional power backoff has a non-zero value applied to the cumulative MTPL based on the cumulative MTPL failing to satisfy a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
5 . The method of claim 2 , wherein the mandatory transmit power backoff includes one or more of a maximum power reduction (MPR) or an additional MPR (A-MPR).
6 . The method of claim 1 , wherein the conditional power backoff is a delta power class backoff that is applicable to the uplink signal.
7 . The method of claim 1 , wherein a value of the per chain transmit power split is based on a number of the multiple transmit chains used to transmit the uplink signal.
8 . The method of claim 1 , wherein an initial value of the cumulative MTPL is based on a power class associated with a band used to transmit the uplink signal.
9 . A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
apply a per chain transmit power split to a cumulative maximum transmit power level (MTPL);
calculate a value associated with a conditional power backoff, wherein the value associated with the conditional power backoff is calculated after the per chain transmit power split is applied to the cumulative MTPL, and wherein the conditional power backoff has a non-zero value that is applied to the cumulative MTPL based on the cumulative MTPL failing to satisfy a threshold associated with the conditional power backoff after the per chain transmit power split is applied to the cumulative MTPL; and
transmit, using multiple transmit chains, an uplink signal using a final transmit power level, wherein the final transmit power level is based on a value of the cumulative MTPL after the per chain transmit power split is applied to the cumulative MTPL and the calculated value associated with the conditional power backoff.
10 . The UE of claim 9 , wherein the one or more processors are further configured to:
apply a mandatory transmit backoff to the cumulative MTPL prior to calculating the value associated with the conditional power backoff, wherein the final transmit power level is further based on the value of the cumulative MTPL after the mandatory transmit backoff is applied to the cumulative MTPL.
11 . The UE of claim 10 , wherein the conditional power backoff has a zero or null value based on the cumulative MTPL satisfying a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
12 . The UE of claim 10 , wherein the conditional power backoff has a non-zero value applied to the cumulative MTPL based on the cumulative MTPL failing to satisfy a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
13 . The UE of claim 10 , wherein the mandatory transmit power backoff includes one or more of a maximum power reduction (MPR) or an additional MPR (A-MPR).
14 . The UE of claim 9 , wherein the conditional power backoff is a delta power class backoff that is applicable to the uplink signal.
15 . The UE of claim 9 , wherein a value of the per chain transmit power split is based on a number of the multiple transmit chains used to transmit the uplink signal.
16 . The UE of claim 9 , wherein an initial value of the cumulative MTPL is based on a power class associated with a band used to transmit the uplink signal.
17 . A method of wireless communication performed by a user equipment (UE), comprising:
applying a per chain transmit power split to a cumulative maximum transmit power level (MTPL);
applying a mandatory transmit backoff to the cumulative MTPL prior to calculating a value associated with a conditional power backoff;
calculating the value associated with the conditional power backoff, wherein the value associated with the conditional power backoff is calculated after the per chain transmit power split is applied to the cumulative MTPL; and
transmitting, using multiple transmit chains, an uplink signal using a final transmit power level, wherein the final transmit power level is based on a value of the cumulative MTPL after the per chain transmit power split is applied to the cumulative MTPL, the value of the cumulative MTPL after the mandatory transmit backoff is applied to the cumulative MTPL, and the calculated value associated with the conditional power backoff.
18 . The method of claim 17 , wherein the conditional power backoff has a zero or null value based on the cumulative MTPL satisfying a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
19 . The method of claim 17 , wherein the conditional power backoff has a non-zero value applied to the cumulative MTPL based on the cumulative MTPL failing to satisfy a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
20 . The method of claim 17 , wherein the mandatory transmit power backoff includes one or more of a maximum power reduction (MPR) or an additional MPR (A-MPR).
21 . The method of claim 17 , wherein the conditional power backoff is a delta power class backoff that is applicable to the uplink signal.
22 . The method of claim 17 , wherein a value of the per chain transmit power split is based on a number of the multiple transmit chains used to transmit the uplink signal.
23 . The method of claim 17 , wherein an initial value of the cumulative MTPL is based on a power class associated with a band used to transmit the uplink signal.
24 . A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
apply a per chain transmit power split to a cumulative maximum transmit power level (MTPL);
apply a mandatory transmit backoff to the cumulative MTPL prior to calculating a value associated with a conditional power backoff;
calculate the value associated with the conditional power backoff, wherein the value associated with the conditional power backoff is calculated after the per chain transmit power split is applied to the cumulative MTPL; and
transmit, using multiple transmit chains, an uplink signal using a final transmit power level, wherein the final transmit power level is based on a value of the cumulative MTPL after the per chain transmit power split is applied to the cumulative MTPL, the value of the cumulative MTPL after the mandatory transmit backoff is applied to the cumulative MTPL, and the calculated value associated with the conditional power backoff.
25 . The UE of claim 24 , wherein the conditional power backoff has a zero or null value based on the cumulative MTPL satisfying a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
26 . The UE of claim 24 , wherein the conditional power backoff has a non-zero value applied to the cumulative MTPL based on the cumulative MTPL failing to satisfy a threshold associated with the conditional power backoff after the per chain transmit power split and the mandatory transmit power backoff are applied to the cumulative MTPL.
27 . The UE of claim 24 , wherein the mandatory transmit power backoff includes one or more of a maximum power reduction (MPR) or an additional MPR (A-MPR).
28 . The UE of claim 24 , wherein the conditional power backoff is a delta power class backoff that is applicable to the uplink signal.
29 . The UE of claim 24 , wherein a value of the per chain transmit power split is based on a number of the multiple transmit chains used to transmit the uplink signal.
30 . The UE of claim 24 , wherein an initial value of the cumulative MTPL is based on a power class associated with a band used to transmit the uplink signal.