Enhancements on transmission power adaptation
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media for transmission power adaptation. The method includes: receiving, at a first device and from a second device, a channel state information configuration; and in response to receiving a reference signal from the second device, transmitting to the second device a channel state information report based on the channel state information configuration, the channel state information report including assistance information on transmission power adjustment for the second device. In this way, the adjustment of transmission power and bandwidth assignment can be implemented without degrading the supported multiple input multiple output layers. Thus, the spectral efficiency is improved, while the data latency and network energy consumption are reduced.
1 . A first device, comprising:
at least one processor; and
at least one memory storing instructions that, when executed with the at least one processor, cause the first device at least to:
receive, from a second device, a channel state information configuration, the channel state information configuration comprises a channel state information measurement configuration comprising a first power offset corresponding to a maximum transmission power reduction supported with the second device and a second power offset between a transmission power of a data transmission from the second device and a transmission power of a reference signal; and
in response to receiving the reference signal from the second device, transmit to the second device a channel state information report based on the channel state information configuration, the channel state information report comprising assistance information on transmission power adjustment for the second device.
2 . The first device of claim 1 , wherein the transmission power adjustment relates to a number of multiple input multiple output layers supported with the first device, or a rank indicator supported with the first device.
3 . The first device of claim 1 , wherein when transmitting the channel state information report, the instructions, when executed with the at least one processor, cause the first device to transmit the channel state information report with:
in accordance with a determination that the channel state information measurement configuration comprises the first power offset, transmitting the channel state information report comprising one of the following:
a first channel quality indicator measured based on the first power offset, or
a second channel quality indicator measured based on the second power offset.
4 . The first device of claim 3 , wherein the first power offset corresponds to a wideband reporting of the first channel quality indicator.
5 . The first device of claim 1 , wherein when transmitting the channel state information report, the instructions, when executed with the at least one processor, cause the first device to transmit the channel state information report with:
in accordance with a determination that the channel state information measurement configuration comprises the first power offset, transmitting the channel state information report comprising a first channel quality indicator measured based on the first power offset, and a second channel quality indicator measured based on the second power offset.
6 . The first device of claim 1 , wherein the assistance information comprises information about a margin over a noise floor level at a predetermined block error rate.
7 . The first device of claim 6 , wherein the assistance information comprises at least one of the following:
a first channel quality indicator measured based on a first power offset corresponding to a maximum transmission power reduction supported with the second device,
a first signal to interference plus noise ratio delta parameter determined based on a first channel quality indicator measured based on the first power offset and a fourth channel quality indicator corresponding to a predetermined channel quality indicator index, or
a second signal to interference plus noise ratio delta parameter determined based on a second channel quality indicator measured based on the second power offset and the fourth channel quality indicator.
8 . The first device of claim 1 , wherein the channel state information report further comprises a first rank indicator supported with the first device based on a second power offset between a transmission power of a data transmission from the second device and a transmission power of the reference signal, the channel state information configuration comprises a first power offset corresponding to a maximum transmission power reduction supported with the second device, and
wherein the assistance information comprises rank indicator information comprising at least one of the following:
a first indication of the first device supporting the first rank indicator based on the first power offset, or a second indication of the first device not to support the first rank indicator based on the second power offset,
a maximum reduced power offset for the first device to support the first rank indicator,
a power offset value for the first device to support a second rank indicator, the second rank indicator being one layer lower than the first rank indicator, or
a third channel quality indicator measured with the first device based on the second rank indicator.
9 . The first device of claim 1 , wherein the channel state information configuration comprises a set of candidate power offset adjustment values, and
wherein the instructions, when executed with the at least one processor, further cause the first device to:
receive, from the second device, an indication of one of the set of candidate power offset adjustment values to be used for the transmission power adjustment.
10 . The first device of claim 9 , wherein the indication is received in one of the following:
a downlink control information,
a medium access control control element, or
a downlink grant.
11 . The first device of claim 9 , wherein the channel state information configuration comprises a second power offset between a transmission power of a data transmission from the second device and a transmission power of the reference signal, and
wherein the instructions, when executed with the at least one processor, further cause the first device to:
determine a third power offset based on the second power offset and the indicated power offset adjustment value;
receive, from the second device, a further reference signal; and
transmit, to the second device, a further channel state information report comprising at least one channel condition parameter measured based on the third power offset.
12 . The first device of claim 1 , wherein the instructions, when executed with the at least one processor, cause the channel state information configuration to be received in a radio resource control message.
13 . The first device of claim 1 , wherein the first device comprises a terminal device, and the second device comprises a network device.
14 . A second device, comprising:
at least one processor; and
at least one memory storing instructions that, when executed with the at least one processor, cause the second device at least to:
transmit a channel state information configuration to a first device, the channel state information configuration comprises a channel state information measurement configuration comprising a first power offset corresponding to a maximum transmission power reduction supported with the second device and a second power offset between a transmission power of a data transmission from the second device and a transmission power of a reference signal;
transmit the reference signal to the first device; and
receive, from the first device, a channel state information report based on the channel state information configuration, the channel state information report comprising assistance information on transmission power adjustment for the second device.
15 . The second device of claim 14 , wherein the transmission power adjustment relates to a number of multiple input multiple output layers supported with the first device, or a rank indicator supported with the first device.
16 . The second device of claim 14 , wherein when receiving the channel state information report, the instructions, when executed with the at least one processor, cause the second device to receive the channel state information report with:
receiving the channel state information report comprising at least one of the following:
a first channel quality indicator measured based on the first power offset, or
a second channel quality indicator measured based on the second power offset.
17 . The second device of claim 16 , wherein the first power offset corresponds to a wideband reporting of the first channel quality indicator.
18 . The second device of claim 14 , wherein the assistance information comprises information about a margin over a noise floor level at a predetermined block error rate.
19 . The second device of claim 18 , wherein the assistance information comprises at least one of the following:
a first channel quality indicator measured based on a first power offset corresponding to a maximum transmission power reduction supported with the second device,
a first signal to interference plus noise ratio delta parameter determined based on a first channel quality indicator measured based on the first power offset and a fourth channel quality indicator corresponding to a predetermined channel quality indicator index, or
a second signal to interference plus noise ratio delta parameter determined based on a second channel quality indicator measured based on the second power offset and the fourth channel quality indicator.
20 . The second device of claim 14 , wherein the channel state information report further comprises a first rank indicator supported with the first device based on a second power offset between a transmission power of a data transmission from the second device and a transmission power of the reference signal, the channel state information configuration comprises a first power offset corresponding to a maximum transmission power reduction supported with the second device, and
wherein the assistance information comprises rank indicator information comprising at least one of the following:
a first indication of the first device supporting the first rank indicator based on the first power offset, or a second indication of the first device not to support the first rank indicator based on the second power offset,
a maximum reduced power offset for the first device to support the first rank indicator,
a power offset value for the first device to support a second rank indicator, the first rank indicator being larger than the second rank indicator, or
a second channel quality indicator measured with the first device based on the second rank indicator.
21 . The second device of claim 14 , wherein the channel state information configuration comprises a set of candidate power offset adjustment values, and
wherein the instructions, when executed with the at least one processor, further cause the second device to:
transmit, to the first device, an indication of one of the set of candidate power offset adjustment values to be used for the transmission power adjustment.
22 . The second device of claim 21 , wherein the indication is transmitted in one of the following:
a downlink control information,
a medium access control control element, or
a downlink grant.
23 . The second device of claim 21 , wherein when transmitting the indication, the instructions, when executed with the at least one processor, cause the second device to transmit the indication with:
determining, based on the assistance information, at least one of a target transmission power or a target bandwidth for the transmission power adjustment, so that the number of the communication channels is supported with the first device;
selecting, from the set of candidate power offset adjustment values, a target power offset adjustment value corresponding to the at least one of target transmission power or the target bandwidth; and
transmitting, to the first device, an indication of the target power offset adjustment value.
24 . The second device of claim 21 , wherein the instructions, when executed with the at least one processor, further cause the second device to:
transmit, to the first device, a further reference signal based on a third power offset, wherein the third power offset is determined based on the indicated power offset adjustment value and a second power offset indicated in the channel state information configuration; and
receive, from the first device, a further channel state information report comprising at least one channel condition parameter measured based on the third power offset.
25 . The second device of claim 14 , wherein the instructions, when executed with the at least one processor, cause the channel state information configuration to be transmitted in a radio resource control message.
26 . The second device of claim 14 , wherein the first device comprises a terminal device, and the second device comprises a network device.
27 . A method, comprising:
receiving, at a first device and from a second device, a channel state information configuration, the channel state information configuration comprises a channel state information measurement configuration comprising a first power offset corresponding to a maximum transmission power reduction supported with the second device and a second power offset between a transmission power of a data transmission from the second device and a transmission power of a reference signal; and
in response to receiving the reference signal from the second device, transmitting to the second device a channel state information report based on the channel state information configuration, the channel state information report comprising assistance information on transmission power adjustment for the second device.
28 . A method, comprising:
transmitting, at a second device, a channel state information configuration to a first device, the channel state information configuration comprises a channel state information measurement configuration comprising a first power offset corresponding to a maximum transmission power reduction supported with the second device and a second power offset between a transmission power of a data transmission from the second device and a transmission power of a reference signal;
transmitting the reference signal to the first device; and
receiving, from the first device, a channel state information report based on the channel state information configuration, the channel state information report comprising assistance information on transmission power adjustment for the second device.