Transmit power change indication
There is provided a method performed by a first device, the method comprising: determining whether or not a change indication from a second device is preferred when transmit power at the second device changes in a transmission to the first device; and providing to the second device, information of whether or not the change indication is preferred.
1 . A first device, comprising:
at least one processor; and
at least one memory storing instructions that, when executed by the at least one processor, cause the first device at least to:
determine, based on a resolution of an analog-to-digital converter (ADC) and operation of an automatic gain control (AGC) loop of the first device, whether or not a change indication from a second device is preferred when physical downlink shared channel (PDSCH) transmit power at the second device changes in a transmission to the first device;
provide, to the second device, information of whether or not the change indication is preferred, wherein the information comprises a single-bit flag transmitted in a radio resource control (RRC) capability or assistance information message; and
in response to the determination, further provide an acceptable range of transmit power change expressed as at least one of an upper or lower threshold in decibels (dB) relative to a configured PDSCH transmit power level signaled via RRC, wherein no change indication is preferred when the change in transmit power is within the acceptable range, and wherein the change indication is preferred when the change in transmit power exceeds the acceptable range, wherein the acceptable range of transmit power change is defined as ±5 dB relative to a configured PDSCH transmit power level of 40 dBm signaled via radio resource control (RRC); and
based on the change indication being received from the second device for a PDSCH transmission exceeding the ±5 dB threshold, adjust an AGC set point of the ADC prior to demodulating the PDSCH transmission.
2 . The first device of claim 1 , wherein the information is alternatively transmitted in a medium access control control element (MAC CE) message.
3 . The first device of claim 2 , wherein the acceptable range is determined relative to a transmit power of a previous acknowledged PDSCH transmission to the first device, and wherein the threshold is dynamically updated based on the previous transmit power.
4 . The first device of claim 3 , wherein the first device is further caused to determine an acceptable rate of transmit power change expressed as a maximum of ±5 dB per millisecond within a one-millisecond window, and provide to the second device a rate indication indicating the acceptable rate.
5 . The first device of claim 4 , wherein the first device dynamically re-determines and re-transmits the single-bit flag and the acceptable range upon detecting or predicting that the ADC is at risk of entering quantization or saturation error regimes.
6 . The first device of claim 5 , wherein, when the single-bit flag indicates that no change indication is preferred, the first device is caused to refrain from adjusting the AGC set point in response to transmit power changes and to perform reception of the PDSCH transmission without AGC modification.
7 . The first device of claim 6 , wherein the second device comprises a next generation Node B (gNB), and the first device comprises a user equipment (UE) configured for demodulation of PDSCH transmissions in a 5G NR network.
8 . A system comprising:
a first device;
at least one processor; and
at least one memory storing instructions that, when executed by the at least one processor, cause the first device at least to:
determine, based on a resolution of an analog-to-digital converter (ADC) and operation of an automatic gain control (AGC) loop of the first device, whether or not a change indication from a second device is preferred when physical downlink shared channel (PDSCH) transmit power at the second device changes in a transmission to the first device;
provide, to the second device, information of whether or not the change indication is preferred, wherein the information comprises a single-bit flag transmitted in a radio resource control (RRC) capability or assistance information message; and
in response to the determination, further provide an acceptable range of transmit power change expressed as at least one of an upper or lower threshold in decibels (dB) relative to a configured PDSCH transmit power level signaled via RRC, wherein no change indication is preferred when the change in transmit power is within the acceptable range, and wherein the change indication is preferred when the change in transmit power exceeds the acceptable range, wherein the acceptable range of transmit power change is defined as ±5 dB relative to a configured PDSCH transmit power level of 40 dBm signaled via radio resource control (RRC); and
based on the change indication being received from the second device for a PDSCH transmission exceeding the ±5 dB threshold, adjust an AGC set point of the ADC prior to demodulating the PDSCH transmission.
9 . The system of claim 8 , wherein the information is alternatively transmitted in a medium access control control element (MAC CE) message.
10 . The system of claim 9 , wherein the acceptable range is determined relative to a transmit power of a previous acknowledged PDSCH transmission to the first device, and wherein the threshold is dynamically updated based on the previous transmit power.
11 . The system of claim 10 , wherein the first device is further caused to determine an acceptable rate of transmit power change expressed as a maximum of ±5 dB per millisecond within a one-millisecond window, and provide to the second device a rate indication indicating the acceptable rate.
12 . The system of claim 11 , wherein the first device dynamically re-determines and re-transmits the single-bit flag and the acceptable range upon detecting or predicting that the ADC is at risk of entering quantization or saturation error regimes.
13 . The system of claim 12 , wherein, when the single-bit flag indicates that no change indication is preferred, the first device is caused to refrain from adjusting the AGC set point in response to transmit power changes and to perform reception of the PDSCH transmission without AGC modification.
14 . The system of claim 13 , wherein the second device comprises a next generation Node B (gNB), and the first device comprises a user equipment (UE) configured for demodulation of PDSCH transmissions in a 5G NR network.
15 . A method comprising:
determining, based on a resolution of an analog-to-digital converter (ADC) and operation of an automatic gain control (AGC) loop of a first device, whether or not a change indication from a second device is preferred when physical downlink shared channel (PDSCH) transmit power at the second device changes in a transmission to the first device;
providing, to the second device, information of whether or not the change indication is preferred, wherein the information comprises a single-bit flag transmitted in a radio resource control (RRC) capability or assistance information message; and
in response to the determination, providing an acceptable range of transmit power change expressed as at least one of an upper or lower threshold in decibels (dB) relative to a configured PDSCH transmit power level signaled via RRC, wherein no change indication is preferred when the change in transmit power is within the acceptable range, and wherein the change indication is preferred when the change in transmit power exceeds the acceptable range, wherein the acceptable range of transmit power change is defined as ±5 dB relative to a configured PDSCH transmit power level of 40 dBm signaled via radio resource control (RRC); and
based on the change indication being received from the second device for a PDSCH transmission exceeding the ±5 dB threshold, adjusting an AGC set point of the ADC prior to demodulating the PDSCH transmission.
16 . The method of claim 15 , wherein the information is alternatively transmitted in a medium access control control element (MAC CE) message.
17 . The method of claim 16 , wherein the acceptable range is determined relative to a transmit power of a previous acknowledged PDSCH transmission to the first device, and wherein the threshold is dynamically updated based on the previous transmit power.
18 . The method of claim 17 , further comprising determining an acceptable rate of transmit power change expressed as a maximum of ±5 dB per millisecond within a one-millisecond window, and provide to the second device a rate indication indicating the acceptable rate.
19 . The method of claim 18 , dynamically re-determining and re-transmitting the single-bit flag and the acceptable range upon detecting or predicting that the ADC is at risk of entering quantization or saturation error regimes.
20 . The method of claim 19 , wherein, when the single-bit flag indicates that no change indication is preferred, the first device is caused to refrain from adjusting the AGC set point in response to transmit power changes and to perform reception of the PDSCH transmission without AGC modification.