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Base station apparatus, user apparatus, and method used in mobile communications system

  • US 8,462,711 B2
  • Filed: 03/17/2008
  • Issued: 06/11/2013
  • Est. Priority Date: 03/20/2007
  • Status: Expired due to Fees
First Claim
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1. A base station apparatus in a mobile communications system which uses orthogonal frequency division multiplexing (OFDM) for downlink, comprising:

  • a unit which generates a first signal;

    a unit which generates a second signal;

    a unit which multiplexes the first signal and the second signal and maps the multiplexed signals to a sub-carrier to generate a transmit symbol;

    a mapping determining unit which determines a position of mapping the second signal to the sub-carrier, wherein the mapping determining unit determines the mapping position based on a cell ID or cell group ID, and a mapping pattern defined with a sequence fhop(j) having a two-stage structure; and

    wherein the mapping pattern defined with the sequence having the two-stage structure is defined by fhop(j)=a(x,j)+b(ID), wherein ID is the cell group ID or the cell ID, a(x,j) is a first-stage sequence including a random hopping pattern having arguments x and j, wherein x=floor(ID/6) and j is an integer from 0 to 9, and wherein b(ID)=ID % 6 is a second-stage sequence representing a fixed shift to the first-stage sequence a(x,j), andwherein the cell or cell group having the same hopping pattern is arranged in a neighboring manner in the first sequence.

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