Angle of departure based channel state information
Apparatuses, methods, and systems are disclosed for angle of departure based channel state information. One method includes estimating, at a receiving device, a channel from a transmitting device using reference signals. The method includes determining a set of up to N beam angle of departures from signals transmitted from the transmitting device having a signal strength greater than a predetermined threshold. The method includes determining a channel quality associated with each angle of departure of the set of up to N beam angle of departures. The method includes sending channel state information comprising information indicating the set of up to N beam angle of departures and the channel quality associated with each angle of departure of the set of up to N beam angle of departures.
1 . A method performed by a user equipment (UE), the method comprising:
estimating, at a receiving device, a channel from a transmitting device using reference signals;
determining a set of up to N beam angle of departures (AoDs) from signals transmitted from the transmitting device having a signal strength greater than a predetermined threshold;
determining a channel quality associated with each AoD of the set of up to N beam AoDs; and
sending channel state information (CSI) comprising information indicating the set of up to N beam AoDs and the channel quality associated with each AoD of the set of up to N beam AoDs, wherein the AoD is in one direction if a transmit beam of the transmitting device is steerable in only one dimension, and the information indicating the set of up to N beam AoDs indicates each AoD as a value indicating the corresponding AoD in the one dimension.
2 . The method of claim 1 , wherein the AoD is in two directions if a transmit beam of the transmitting device is steerable in two dimensions, and the information indicating the set of up to N beam AoDs indicates each AoD as two values indicating the corresponding AoD in the two directions.
3 . The method of claim 1 , wherein the channel quality associated with each AoD of the set of up to N beam AoDs comprises a value representing:
an effective channel gain of the corresponding AoD;
an effective channel vector of the corresponding AoD;
a reference signal received power of the corresponding AoD;
a signal to noise ratio, a signal to interference and noise ratio, or a combination thereof of the corresponding AoD;
a highest modulation and coding scheme of the corresponding AoD; or
a combination thereof.
4 . The method of claim 1 , wherein the transmitting device comprises a base station and the receiving device comprises a UE.
5 . A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
estimate a channel from a transmitting device using reference signals;
determine a set of up to N beam AoDs from signals transmitted from the transmitting device having a signal strength greater than a predetermined threshold; and
determine a channel quality associated with each AoD of the set of up to N beam AoDs; and
send channel state information (CSI) comprising information indicating the set of up to N beam AoDs and the channel quality associated with each AoD of the set of up to N beam AoDs, wherein the AoD is in one direction if a transmit beam of the transmitting device is steerable in only one dimension, and the information indicating the set of up to N beam AoDs indicates each AoD as a value indicating the corresponding AoD in the one dimension.
6 . The UE of claim 5 , wherein the AoD is in two directions if the transmit beam of the transmitting device is steerable in two dimensions, and the information indicating the set of up to N beam AoDs indicates each AoD as two values indicating the corresponding AoD in the two directions.
7 . The UE of claim 5 , wherein the channel quality associated with each AoD of the set of up to N beam AoDs comprises a value representing:
an effective channel gain of the corresponding AoD;
an effective channel vector of the corresponding AoD;
a reference signal received power of the corresponding AoD;
a signal to noise ratio, a signal to interference and noise ratio, or a combination thereof of the corresponding AoD;
a highest modulation and coding scheme of the corresponding AoD; or
a combination thereof.
8 . The UE of claim 5 , wherein the transmitting device comprises a base station.
9 . A base station, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
transmit, from a transmitting device, reference signals to a receiving device for estimating a channel; and
receive channel state information (CSI) comprising information indicating a set of up to N beam AoDs and a channel quality associated with each AoD of the set of up to N beam AoDs from the receiving device, wherein the AoD is in one direction if a transmit beam of the transmitting device is steerable in only one dimension, and the information indicating the set of up to N beam AoDs indicates each AoD as a value indicating the corresponding AoD in the one dimension.
10 . The base station of claim 9 , wherein the AoD is in two directions if a transmit beam of the transmitting device is steerable in two dimensions, and the information indicating the set of up to N beam AoDs indicates each AoD as two values indicating the corresponding AoD in the two directions.
11 . The base station of claim 9 , wherein the channel quality associated with each AoD of the set of up to N beam AoDs comprises a value representing:
an effective channel gain of the corresponding AoD;
an effective channel vector of the corresponding AoD;
a reference signal received power of the corresponding AoD;
a signal to noise ratio, a signal to interference and noise ratio, or a combination thereof of the corresponding AoD;
a highest modulation and coding scheme of the corresponding AoD; or
a combination thereof.
12 . The base station of claim 9 , wherein the transmitting device determines a transmission rank, the set of up to N beam AoDs, and a modulation and coding scheme used for transmissions to the receiving device based on the CSI received from the receiving device.
13 . The base station of claim 9 , wherein the transmitting device comprises a base station and the receiving device comprises a UE.
14 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
estimate, at a receiving device, a channel from a transmitting device using reference signals;
determine a set of up to N beam angle of departures (AoDs) from signals transmitted from the transmitting device having a signal strength greater than a predetermined threshold;
determine a channel quality associated with each AoD of the set of up to N beam AoDs; and
send channel state information (CSI) comprising information indicating the set of up to N beam AoDs and the channel quality associated with each AoD of the set of up to N beam AoDs, wherein the AoD is in one direction if a transmit beam of the transmitting device is steerable in only one dimension, and the information indicating the set of up to N beam AoDs indicates each AoD as a value indicating the corresponding AoD in the one dimension.
15 . The processor of claim 14 , wherein the AoD is in two directions if a transmit beam of the transmitting device is steerable in two dimensions, and the information indicating the set of up to N beam AoDs indicates each AoD as two values indicating the corresponding AoD in the two directions.
16 . The processor of claim 14 , wherein the channel quality associated with each AoD of the set of up to N beam AoDs comprises a value representing:
an effective channel gain of the corresponding AoD;
an effective channel vector of the corresponding AoD;
a reference signal received power of the corresponding AoD;
a signal to noise ratio, a signal to interference and noise ratio, or a combination thereof of the corresponding AoD;
a highest modulation and coding scheme of the corresponding AoD; or
a combination thereof.