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Hybrid automatic repeat request (HARQ) mapping for carrier aggregation (CA)

  • US 9,439,095 B2
  • Filed: 04/19/2013
  • Issued: 09/06/2016
  • Est. Priority Date: 09/28/2012
  • Status: Active Grant
First Claim
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1. A user equipment (UE) operable to dynamically alter hybrid automatic retransmission re-quest (HARQ) mapping for carrier aggregation (CA), having computer circuitry configured to:

  • determine a secondary HARQ bundling window size for a subframe for a secondary cell (SCell) based on uplink-downlink (UL-DL) configuration of the SCell, wherein the secondary HARQ bundling window includes at least one of a number of downlink (DL) subframes or a previous radio frame, when a primary HARQ bundling window size for a primary cell (PCell) is zero;

    determine a physical uplink control channel (PUCCH) resource for transmission of a HARQ-ACKnowledge (ACK) feedback for a physical downlink shared channel (PDSCH) on the PCell and the SCell based on a number of a first Control Channel Element (CCE) used to construct a physical downlink control channel (PDCCH) for transmission of a corresponding PDSCH in the secondary HARQ bundling window of the SCell; and

    transmit the HARQ-ACK feedback in the determined PUCCH resource, wherein the PUCCH resource nPUCCH(1,{tilde over (p)}) for transmission of the HARQ-ACK in a subframe n for a {tilde over (p)} mapped to an antenna port p for a Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard Release 11 PUCCH format 1a or 1b, is represented by;

    nPUCCH,i(1,{tilde over (p)}0)=(M−

    m−

    1)·

    Nc+m·

    Nc+1+nCCE+NPUCCH(1) for antenna port p0 for time division duplex (TDD) when the secondary HARQ bundling window size Ms=1 and the primary HARQ bundling window size Mp=0, where a HARQ bundling window size M=Ms, nCCE is a number of a first CCE index used for transmission of a corresponding physical downlink control channel (PDCCH) in subframe n−

    km and the corresponding m, where km is the smallest value in set K such that UE detects a PDCCH in subframe n−

    km,Nc=max{0,└

    [NRBDL·

    (NscRB·

    c−

    4)]/36┘

    } where c is a value out of {0, 1, 2, 3} such that Nc

    nCCE<

    Nc+1, NRBDL is a downlink bandwidth configuration, expressed in units of NscRB, NscRB is a resource block size in the frequency domain, expressed as a number of subcarriers, and NPUCCH(1) is a starting PUCCH channel index for a PUCCH region in an uplink subframe and is configured by high layers for each UE; and

    nPUCCH,i(1,{tilde over (p)}1)=(M−

    m−

    1)·

    Nc+m·

    Nc+1+nCCE+1+NPUCCH(1) for antenna port p1 for time division duplex (TDD) when the secondary HARQ bundling window size Ms=1 and primary HARQ bundling window size Mp=0 and a two port transmission is configured.

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