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Radio communication system, base station apparatus and user terminal

  • US 8,982,817 B2
  • Filed: 02/15/2011
  • Issued: 03/17/2015
  • Est. Priority Date: 02/15/2010
  • Status: Active Grant
First Claim
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1. A radio communication system in which a first communication system and a second communication system are arranged in an overlapping manner, the radio communication system comprising:

  • a base station apparatus communicating in the first and second communication systems; and

    a user terminal communicating with the base station;

    the first communication system adding or removing a frequency band to assign for communication between the base station apparatus and the user terminal on a per fundamental frequency block basis, and the second communication system performing communication between the base station apparatus and the user terminal via one fixed fundamental frequency block, wherein;

    in the first communication system, one of fundamental frequency blocks assigned to the user terminal is determined as an anchor block, and the anchor block supports a same operation as in the second communication system;

    the base station apparatus allocates resources such that a shared data channel for transmission of user data and downlink control information for demodulation of the shared data channel are mapped to the same or different fundamental frequency blocks;

    the base station apparatus controls whether or not to add a carrier indicator of a fundamental frequency block to which the shared data channel is mapped to the downlink control information; and

    the base station apparatus, in an anchor block, regardless of whether or not the carrier indicator exists, maps downlink control information, which is for demodulating the shared data channel mapped to the anchor block and to which the carrier indicator is not added, in a control channel region of the anchor block.

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