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Method for uplink power control in OFDMA TDD system

  • US 8,717,969 B2
  • Filed: 12/30/2009
  • Issued: 05/06/2014
  • Est. Priority Date: 12/31/2008
  • Status: Active Grant
First Claim
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1. A method for uplink power control in OFDMA (Orthogonal Frequency Division Multiple Access) TDD (Time Division Duplex) system, the method comprising:

  • measuring a RSSI (Received Signal Strength Indicator) of downlink signals;

    updating a RSSI (Received Signal Strength Indicator) average by calculating a weighted sum of the measured RSSIs and a previous RSSI average; and

    carrying out an uplink power control based on the updated RSSI average,wherein weights used for calculating the weighted sum are determined according to at least one of a channel variation rate and a link symmetry,wherein the RSSI average is updated by using the following equation;


    RSSIcurrentavg

    *RSSI+(1−

    α

    )*RSSIpreviousavg,wherein RSSIcurrentavg and RSSIPpreviousavg are the updated RSSI average and the previous RSSI average, respectively, RSSI is the measured RSSI, and α

    is a real number higher than 0 and lower than 1, andwherein α

    is set to a first value when the channel variation rate is lower than a predetermined value, α

    is set to a second value when the channel variation rate is not lower than the predetermined value, and the first value is higher than the second value.

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