Signaling of full power uplink MIMO capability
According to some embodiments, a method performed by a wireless device for transmitting on a plurality of antennas comprises signaling, to a network node, a wireless device power transmission capability. The wireless device power transmission capability identifies a power ratio value of a plurality of power ratio values that the wireless device supports for transmission of a physical uplink channel. Each value of the plurality of power ratio values corresponds to a transmission power capability and to a number of antenna ports. A power ratio refers to a ratio relative to a maximum power the wireless device is rated to transmit. The method further comprises transmitting a physical uplink channel using the 0 number of antenna ports with a power scaled at least by the power ratio value.
1 . A method performed by a wireless device for transmitting on a plurality of antennas, the method comprising:
signaling, to a network node, a wireless device power transmission capability, wherein the wireless device power transmission capability identifies a subset of transmit precoder matrix indicators, TPMIs, for which full power is supported by the wireless device for transmission of a physical uplink shared channel, PUSCH, for a number of antenna ports supported by the wireless device; and
transmitting the PUSCH using the number of antenna ports with a power scaled by the ratio of the number of antenna ports with a non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource, wherein the wireless device splits the power equally across the antenna ports on which the UE transmits the PUSCH with non-zero power, wherein the scaling is limited so that the scaled transmission power does not exceed the maximum value the wireless device is rated to transmit, and wherein the scaling is by a factor
δ
(
k
)
=
min
(
1
,
N
nz
·
Δ
(
k
)
N
srs
)
,
wherein Δ(k) is a power ratio value and a real positive real number, N nz is a number of antenna ports with non-zero transmission power used to transmit the physical uplink channel, and N SRS is a number of antenna ports and a number of sounding reference signal (SRS) ports in an SRS resource with index k configured to the wireless device.
2 . The method of claim 1 , wherein the transmission power capability identifies a plurality of power ratio values, each associated with a number of physical uplink channel layers, a precoder to be used to transmit the physical uplink channel, and the number of antenna ports.
3 . The method of claim 1 , wherein the transmission power capability identifies a plurality of power ratio values, each associated with a different number of antenna ports.
4 . The method of claim 1 , wherein the transmission power capability corresponds to a codebook subset, the subset identified as containing at least one of fully and partial and non-coherent precoders, partial and non-coherent precoders, and non-coherent precoders.
5 . The method of claim 1 , wherein the transmission power capability further comprises a second power ratio of the plurality of power ratio values and a precoder that the wireless device may use for physical uplink channel transmission with the power scaled by the second power ratio and with the number of antenna ports.
6 . A wireless device capable of transmitting on a plurality of antennas, the wireless device comprising processing circuitry operable to:
signal, to a network node, a wireless device power transmission capability, wherein the wireless device power transmission capability identifies a subset of transmit precoder matrix indicators, TPMIs, for which full power is supported by the wireless device for transmission of a physical uplink shared channel, PUSCH, for a number of antenna ports supported by the wireless device; and
transmit the PUSCH using the number of antenna ports with a power scaled by the ratio of the number of antenna ports with a non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource, wherein the wireless device splits the power equally across the antenna ports on which the UE transmits the PUSCH with non-zero power, wherein the scaling is limited so that the scaled transmission power does not exceed the maximum value the wireless device is rated to transmit, and wherein the scaling is by a factor
δ
(
k
)
=
min
(
1
,
N
nz
·
Δ
(
k
)
N
srs
)
,
wherein Δ(K) is a power ratio value and a real positive real number, N nz is a number of antenna ports with non-zero transmission power used to transmit the physical uplink channel, and N SRS is a number of antenna ports and a number of sounding reference signal (SRS) ports in an SRS resource with index k configured to the wireless device.
7 . The wireless device of claim 6 , wherein the transmission power capability identifies a plurality of power ratio values, each associated with a number of physical uplink channel layers, a precoder to be used to transmit the physical uplink channel, and the number of antenna ports.
8 . The wireless device of claim 6 , wherein the transmission power capability identifies a plurality of power ratio values, each associated with a different number of antenna ports.
9 . The wireless device of claim 6 , wherein the transmission power capability corresponds to a codebook subset, the subset identified as containing at least one of fully and partial and non-coherent precoders, partial and non-coherent precoders, and non-coherent precoders.
10 . The wireless device of claim 6 , wherein the transmission power capability further comprises a second power ratio of the plurality of power ratio values and a precoder that the wireless device may use for physical uplink channel transmission with the power scaled by the second power ratio and with the number of antenna ports.