Method, apparatus and computer program for power control related to random access procedures

  • US 8,385,966 B2
  • Filed: 05/05/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 05/05/2008
  • Status: Active Grant
First Claim
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1. A method comprising:

  • using a processor to initialize for i=0 a first power control adjustment state g(i) for an uplink control channel and a second power control adjustment state f(i) for an uplink shared channel to each reflect an open loop power control error;

    using the processor to compute an initial transmit power for the uplink shared channel using full path loss compensation, wherein the initial transmit power depends on a preamble power of a first message sent on an access channel and the second power control adjustment state f(0); and

    sending from a transmitter a third message on the uplink shared channel at the initial transmit power;

    wherein the second power control adjustment state f(i) for i=0 is initialized as;


    P0

    UE

    PUSCH+f(0)=Δ

    PPC

    P
    rampup;

    in which;

    P0

    UE

    PUSCH is a power control constant for the uplink shared channel that is specific for a user equipment executing the method;

    Δ

    Prampup is a ramp-up power for preamble transmissions; and

    Δ

    PPC is a power control command indicated in a second message that is received in response to sending the first message.

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