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User terminal, radio base station, downlink control channel receiving method and mobile communication system

  • US 9,806,834 B2
  • Filed: 04/24/2012
  • Issued: 10/31/2017
  • Est. Priority Date: 05/02/2011
  • Status: Active Grant
First Claim
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1. A user terminal that receives an enhanced downlink control channel frequency-division-multiplexed with a downlink shared channel from a radio base station, the user terminal comprising:

  • a receiving section that receives from the radio base station a first or a second value of a Physical Hybrid-ARQ Indicator Channel (PHICH) duration, the first value indicating that an extended PHICH is not applied and the second value indicating that the extended PHICH is applied; and

    a detection section that detects a starting position of an orthogonal frequency division multiplexing (OFDM) symbol for the enhanced downlink control channel in a subframe, based on the PHICH duration, whereinwhen the second value is signaled by higher layer signaling, the detection section detects that a control format indicator (CFI) value is equal to a number of OFDM symbols to which the PHICH is multiplexed, andwherein when the first value is received, the PHICH is allocated and multiplexed to only a single OFDM symbol;

    wherein when the second value is received, the PHICH is allocated and multiplexed to a plurality of OFDM symbols.

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