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Enhanced carrier aggregation in communications

  • US 10,530,553 B2
  • Filed: 04/10/2015
  • Issued: 01/07/2020
  • Est. Priority Date: 04/10/2015
  • Status: Active Grant
First Claim
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1. An apparatus comprisingat least one processor;

  • andat least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus todefine scheduled downlink carriers from a list of configured downlink carriers;

    define a downlink assignment index of a scheduled carrier having at least the lowest carrier index from the list of configured downlink carriers, based on a total number of scheduled carriers;

    define the downlink assignment index for each other scheduled carrier of the rest of the scheduled downlink carriers having a higher carrier index from the list of configured downlink carriers;

    based on the defining, cause transmission of a control message to a terminal device, the control message corresponding to each scheduled carrier, the control message indicating a downlink assignment scheduling a physical downlink shared channel, and comprising at least one information element indicating the defined downlink assignment index;

    receive, from the terminal device, uplink control signalling indicating HARQ-ACKs related to physical downlink shared channels corresponding to the scheduled carriers;

    wherein it is defined that
    DAI=(number of scheduled carriers−

    1)modulo(2N)wherein DAI is the downlink assignment index of the scheduled carrier having at least the lowest carrier index, andN is the number of downlink assignment index bits;

    or wherein it is defined that
    DAI(m)=(m−

    1)modulo(2N)wherein DAI(m) is the downlink assignment index of a scheduled carrier having a carrier index higher than the lowest carrier index,m is the carrier index, andN is the number of downlink assignment index bits.

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