Method And Apparatus For Transmit Power Control For Multiple Antenna Transmissions In The Uplink

Abstract

Techniques for transmit power control for multiple antenna transmissions in an uplink are disclosed. A wireless transmit/receive unit (WTRU) generates at least one input stream for transmission and applies a gain factor to each channel. The gain factor is determined based on a reference channel power estimate. The WTRU generates at least two data streams from the input stream for transmission via a plurality of antennas and applies weights to the data streams. The gain factor and/or the weights are controlled such that a transmit power on each antenna is within a maximum allowed value. The WTRU may perform power scaling on a condition that a transmit power on any antenna exceeds the maximum allowed value. The WTRU may scale down an enhanced dedicated channel (E-DCH) dedicated physical data channel (E-DPDCH) first before other channels. For multiple E-DCH streams the WTRU may calculate an E-DPDCH power offset based on an additional power offset factor due to multiple stream transmission.

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US2011105174A1	3G	21/12/2016	ISLD-201706-015	INTERDIGITAL INC	S1 TS Number: TS 125 133 Version No: ---- Section No: Release : ---- S2 TS Number: TS 125 214 Version No: ---- Section No: Release : ---- S3 TS Number: TS 125 215 Version No: ---- Section No: Release : ---- +2 -2	Yes	Basis Patent
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Publication No	Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
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Technologies

Resource configuration

Power Control

Product

User Equipment (UE/Terminal)

Use Cases

Wireless communication

Services

Multi Antenna Communication System

Claim

1. A method for transmit power control for multiple antenna transmissions in an uplink in a wireless transmit/receive unit (WTRU), the method comprising:', 'generating at least one input stream for transmission;', 'applying a gain factor to each channel included in the input stream, the gain factor being determined based on a reference channel power estimate; generating at least two data streams from the input stream for transmission via a plurality of antennas; and', 'applying weights to the data streams, wherein at least one of the gain factor or the weights are controlled such that a transmit power on each antenna is within a maximum allowed value.

2. The method of claim 1 further comprising:', 'performing power measurements on a power reference channel on each antenna;', 'filtering the power measurements over a predetermined period to calculate an average reference channel power estimate on each antenna; and', 'selecting as the reference channel power estimate a largest one of average reference channel power estimates over all antennas.

3. The method of claim 1 further comprising:', 'calculating a UE power headroom (UPH) for each antenna;', 'selecting a smallest one among UPHs calculated for all antennas; and sending scheduling information including the selected UPH.

4. The method of claim 1 further comprising:', 'performing power scaling on a condition that a transmit power on any antenna exceeds a maximum allowed value; scaling down an E-DCH dedicated physical data channel (E-DPDCH) on an antenna which exceeds the maximum allowed value until the transmit power does not exceed the maximum allowed value or a gain factor for the E-DPDCH reaches a minimum gain value for the E-DPDCH; and', 'scaling down all channels on both antennas on a condition that the transmit power still exceeds the maximum allowed value after scaling down the E-DPDCH.

5. A method for transmit power control for multiple antenna transmissions in an uplink in a wireless transmit/receive unit (WTRU), the method comprising:', 'generating at least one enhanced dedicated channel (E-DCH) codeword; generating at least two data streams from the E-DCH codeword for transmission via a plurality of antennas;', 'calculating an E-DCH dedicated physical data channel (E-DPDCH) power offset for each data stream, the E-DPDCH power offset being calculated based on a temporary variable, which is calculated based on an additional power offset factor due to multiple stream transmission;', 'applying the E-DPDCH power offset; and', 'transmitting the data streams.

6. The method of claim 5 wherein the additional power offset factor is a different value for each data stream.

7. The method of claim 5 wherein the additional power offset factor depends on at least one of a multiple -input multiple- output (MIMO) operation mode, a receiver type, whether or not a dedicated physical control channel (DPCCH) is precoded, whether or not an E-DCH dedicated physical control channel (E-DPCCH) is precoded, or a quality of service (QoS) of each data stream.

8. The method of claim 5 wherein the additional power offset factor depends on a transport block (TB) size for each data stream or a pair of TB sizes for the data streams.

9. The method of claim 5 wherein the additional power offset factor depends on a power offset difference between data streams

10. The method of claim 5 wherein a separate dedicated physical control channel (DPCCH) is transmitted via each antenna and a transmit power of DPCCHs are controlled by a single power control loop

11. A wireless transmit/receive unit (WTRU) for transmit power control for multiple antenna transmissions in an uplink, the WTRU comprising:', 'a plurality of antennas; and', 'a processor configured to generate at least one input stream for transmission, apply a gain factor to each channel included in the input stream, the gain factor being determined based on a reference channel power estimate, generate at least two data streams from the input stream for transmission via a plurality of antennas, and apply weights to the data streams, wherein at least one of the gain factor or the weights are controlled such that a transmit power on each antenna is within a maximum allowed value

12. The WTRU of claim 11 wherein the processor is configured to perform power measurements on a power reference channel on each antenna, filter the power measurements over a predetermined period to calculate an average reference channel power estimate on each antenna, and select as the reference channel power estimate a largest one of average reference channel power estimates over all antennas

13. The WTRU of claim 11 wherein the processor is configured to calculate a UE power headroom (UPH) for each antenna, select a smallest one among UPHs calculated for all antennas, and send scheduling information including the selected UPH

14. The WTRU of claim 11 wherein the processor is configured to scale down an E-DCH dedicated physical data channel (E-DPDCH) on a condition that a transmit power on any antenna exceeds a maximum allowed value until the transmit power does not exceed the maximum allowed value or a gain factor for the E-DPDCH reaches a minimum gain value for the E-DPDCH, and scale down all channel on a condition that the transmit power still exceeds the maximum allowed value after scaling down the E-DPDCH

15. A wireless transmit/receive unit (WTRU) for transmit power control for multiple antenna transmissions in an uplink, the WTRU comprising:', 'a plurality of antennas; and', 'a processor configured to generate at least one enhanced dedicated channel (E-DCH) codeword, generate at least two data streams from the E-DCH codeword for transmission via a plurality of antennas, calculate an E-DCH dedicated physical data channel (E-DPDCH) power offset for each data stream, the E- DPDCH power offset being calculated based on a temporary variable, which is calculated based on an additional power offset factor due to multiple stream transmission, apply the E-DPDCH power offset, and transmit the data streams

16. The WTRU of claim 15 wherein the additional power offset factor is a different value for each data stream

17. The WTRU of claim 15 wherein the additional power offset factor depends on at least one of a multiple -input multiple- output (MIMO) operation mode, a receiver type, whether or not a dedicated physical control channel (DPCCH) is precoded, whether or not an E-DCH dedicated physical control channel (E-DPCCH) is precoded, or a quality of service (QoS) of each data stream

18. The WTRU of claim 15 wherein the additional power offset factor depends on a transport block (TB) size for each data stream or a pair of TB sizes for the data streams

19. The WTRU of claim 15 wherein the additional power offset factor depends on a power offset difference between data streams.

20. The WTRU of claim 15 wherein a separate dedicated physical control channel (DPCCH) is transmitted via each antenna and a transmit power of DPCCHs are controlled by a single power control loop.']

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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

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Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

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