Method and apparatus for transmit power control for multiple antenna transmissions in the uplink

A technology of transmission power control and multi-antenna transmission, which is applied in radio transmission systems, power management, transmission systems, etc., and can solve problems such as received signal power fluctuations

Inactive Publication Date: 2012-07-11
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Multipath fading causes unwanted fluctuations in received signal power

Method used

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  • Method and apparatus for transmit power control for multiple antenna transmissions in the uplink
  • Method and apparatus for transmit power control for multiple antenna transmissions in the uplink
  • Method and apparatus for transmit power control for multiple antenna transmissions in the uplink

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Embodiment

[0238] CLAIMS 1. A method for transmit power control in a WTRU for multi-antenna transmissions in the uplink.

[0239] 2. The method of embodiment 1, comprising generating at least one input stream for transmission.

[0240] 3. The method of embodiment 2, comprising applying a gain factor to each channel included in the input stream, the gain factor being determined based on a reference channel power estimate.

[0241] 4. The method of embodiment 3, comprising generating from the input stream at least two data streams for transmission via a plurality of antennas.

[0242] 5. The method of embodiment 4, comprising applying weights to the data streams, wherein at least one of gain factors or weights is controlled such that transmit power on each antenna is within a maximum allowable value.

[0243] 6. The method as in any one of embodiments 2-5, further comprising performing a power measurement on a power reference channel on each antenna.

[0244] 7. The method of embodiment ...

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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.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application 61 / 248,034, filed October 2, 2009, and US Provisional Application 61 / 247,995, filed October 2, 2009, the contents of which are incorporated herein by reference. Background technique [0003] The demand for wireless communication services has increased significantly, both for voice services and for data services. To meet the increasing demands, new wireless technologies were developed. For example, in the 3rd Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (WCDMA), High Speed ​​Downlink Packet Access (HSDPA) and High Speed ​​Uplink Packet Access were introduced in Releases 5 and 6, respectively. Access (HSUPA) to achieve significant increases in spectral efficiency and peak data rates. [0004] Airborne wireless signals are susceptible to various signal impairments, including transmission loss, shadowing, multipath fading, Dopple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/36
CPCH04W52/146H04B7/0413H04W52/367H04B7/0615H04B7/0465H04W52/42H04W52/54H04W52/18H04W52/36H04J13/00H04L1/1812H04W52/34H04W72/0473
Inventor B·佩尔蒂埃L·蔡H·张
Owner INTERDIGITAL PATENT HLDG INC
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