METHOD TO BOOST UPLINK POWER
A method to boost uplink transmit power of the UE in at least one of 5G NR and O-RAN wireless communication systems includes: i) selecting, by a serving next generation node B (gNB), at least one candidate user equipment (UE) in a serving cell for boosting transmit power; ii) requesting, by the serving gNB, the at least one candidate UE to measure and report received power from neighboring cells, to estimate pathlosses of the at least one candidate UE to the neighboring cells; iii) selecting, by the serving gNB, the at least one candidate UE as an eligible UE for power boosting in the case the estimated pathlosses of the at least one candidate UE to the neighboring cells is higher than a specified threshold; and iv) boosting, by the serving gNB, transmit power of the eligible UE using Transmit Power Control (TPC) command.
1 . A method to boost uplink transmit power of the UE in at least one of 5G NR and O-RAN wireless communication systems, comprising:
i) selecting, by a serving next generation node B (gNB), at least one candidate user equipment (UE) in a serving cell for boosting transmit power;
ii) requesting, by the serving gNB, the at least one candidate UE to measure and report received power from neighboring cells, to estimate pathlosses of the at least one candidate UE to the neighboring cells;
iii) selecting, by the serving gNB, the at least one candidate UE as an eligible UE for power boosting in the case the estimated pathlosses of the at least one candidate UE to the neighboring cells is higher than a specified threshold; and
iv) boosting, by the serving gNB, transmit power of the eligible UE using Transmit Power Control (TPC) command.
2 . The method according to claim 1 , further comprising:
stopping, by the serving gNB, the boosting of transmit power of the eligible UE in the case one of the following criteria is met:
a) average noise plus interference (NI) of allocated physical resource blocks (PRBs) is higher than a specified limit;
b) one of i) the eligible UE reports a buffer size of zero, or ii) the serving gNB has drained all reported buffer size; or
c) the eligible UE reports an overheated condition.
3 . The method according to claim 1 , wherein a selection criterion for selecting a candidate UE is one of the following: a) the UE is not power-limited; b) the UE has a lower pathloss to the serving gNB than a specified threshold; or c) the UE has a higher buffer size than a specified threshold.
4 . The method according to claim 1 , wherein the the serving gNB requests the at least one candidate UE to measure and report Reference Signal Received Power (RSRP) of the neighboring cells, to estimate pathlosses of the at least one candidate UE to the neighboring cells.
5 . The method according to claim 4 , wherein one of:
i) in the case the serving gNB does not receive any report of RSRP from the at least one candidate UE, selecting the candidate UE as an eligible UE for power boosting; or
ii) in the case the serving gNB receives at least one reported RSRP of a neighboring cell from the at least one candidate UE,
a) converting, by the serving gNB, the at least one reported RSRP to a corresponding pathloss to the neighboring cell; and
b) in the case the corresponding pathloss to the neighboring cell is higher than a specified pathloss threshold, selecting the candidate UE as an eligible UE for power boosting.
6 . The method according to claim 5 , wherein:
ii) in the case the serving gNB receives at least two reported RSRPs of neighboring cells from the at least one candidate UE,
a) converting, by the serving gNB, the lowest value of the at least two reported RSRPs to a corresponding minimum pathloss to the neighboring cells; and
b) in the case the corresponding minimum pathloss to the neighboring cells is higher than the specified pathloss threshold, selecting the candidate UE as an eligible UE for power boosting.
7 . The method according to claim 1 , wherein the serving gNB boosts the transmit power of the eligible UE using the TPC command until all of the following conditions are no longer satisfied:
i) physical uplink shared channel (PUSCH) transmit power of the eligible UE is less than a specified maximum transmit power P max ;
ii) signal to interference plus noise ratio (SINR) is less than a specified maximum SINR; and
iii) maximum interference caused by the UE to the neighboring cells is less than a specified threshold thIntfNbr.
8 . The method according to claim 7 , wherein the specified maximum SINR corresponds to maximum Modulation and Coding Scheme (MCS) supported by both the serving gNB and the eligible UE.
9 . The method according to claim 2 , wherein a selection criterion for selecting a candidate UE is one of the following: a) the UE is not power-limited; b) the UE has a lower pathloss to the serving gNB than a specified threshold; or c) the UE has a higher buffer size than a specified threshold.
10 . The method according to claim 2 , wherein the the serving gNB requests the at least one candidate UE to measure and report Reference Signal Received Power (RSRP) of the neighboring cells, to estimate pathlosses of the at least one candidate UE to the neighboring cells.
11 . The method according to claim 10 , wherein one of:
i) in the case the serving gNB does not receive any report of RSRP from the at least one candidate UE, selecting the candidate UE as an eligible UE for power boosting; or
ii) in the case the serving gNB receives at least one reported RSRP of a neighboring cell from the at least one candidate UE,
a) converting, by the serving gNB, the at least one reported RSRP to a corresponding pathloss to the neighboring cell; and
b) in the case the corresponding pathloss to the neighboring cell is higher than a specified pathloss threshold, selecting the candidate UE as an eligible UE for power boosting.
12 . The method according to claim 11 , wherein:
ii) in the case the serving gNB receives at least two reported RSRPs of neighboring cells from the at least one candidate UE,
a) converting, by the serving gNB, the lowest value of the at least two reported RSRPs to a corresponding minimum pathloss to the neighboring cells; and
b) in the case the corresponding minimum pathloss to the neighboring cells is higher than the specified pathloss threshold, selecting the candidate UE as an eligible UE for power boosting.
13 . The method according to claim 2 , wherein the serving gNB boosts the transmit power of the eligible UE using the TPC command until all of the following conditions are no longer satisfied:
iv) physical uplink shared channel (PUSCH) transmit power of the eligible UE is less than a specified maximum transmit power P max ;
v) signal to interference plus noise ratio (SINR) is less than a specified maximum SINR; and
vi) maximum interference caused by the UE to the neighboring cells is less than a specified threshold thIntfNbr.
14 . The method according to claim 13 , wherein the specified maximum SINR corresponds to maximum Modulation and Coding Scheme (MCS) supported by both the serving gNB and the eligible UE.
15 . The method according to claim 3 , wherein the serving gNB boosts the transmit power of the eligible UE using the TPC command until all of the following conditions are no longer satisfied:
i) physical uplink shared channel (PUSCH) transmit power of the eligible UE is less than a specified maximum transmit power P max ;
ii) signal to interference plus noise ratio (SINR) is less than a specified maximum SINR; and
iii) maximum interference caused by the UE to the neighboring cells is less than a specified threshold thIntfNbr.
16 . The method according to claim 15 , wherein the specified maximum SINR corresponds to maximum Modulation and Coding Scheme (MCS) supported by both the serving gNB and the eligible UE.
17 . The method according to claim 4 , wherein the serving gNB boosts the transmit power of the eligible UE using the TPC command until all of the following conditions are no longer satisfied:
i) physical uplink shared channel (PUSCH) transmit power of the eligible UE is less than a specified maximum transmit power P max ;
ii) signal to interference plus noise ratio (SINR) is less than a specified maximum SINR; and
iii) maximum interference caused by the UE to the neighboring cells is less than a specified threshold thIntfNbr.
18 . The method according to claim 17 , wherein the specified maximum SINR corresponds to maximum Modulation and Coding Scheme (MCS) supported by both the serving gNB and the eligible UE.
19 . The method according to claim 5 , wherein the serving gNB boosts the transmit power of the eligible UE using the TPC command until all of the following conditions are no longer satisfied:
i) physical uplink shared channel (PUSCH) transmit power of the eligible UE is less than a specified maximum transmit power P max ;
ii) signal to interference plus noise ratio (SINR) is less than a specified maximum SINR; and
iii) maximum interference caused by the UE to the neighboring cells is less than a specified threshold thIntfNbr.
20 . The method according to claim 19 , wherein the specified maximum SINR corresponds to maximum Modulation and Coding Scheme (MCS) supported by both the serving gNB and the eligible UE.