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Systems and methods for carrier aggregation

  • US 10,284,350 B2
  • Filed: 10/20/2016
  • Issued: 05/07/2019
  • Est. Priority Date: 10/31/2012
  • Status: Expired due to Fees
First Claim
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1. A user equipment (UE) for performing carrier aggregation, comprising:

  • a processor;

    memory in electronic communication with the processor, wherein instructions stored in the memory are executable to;

    send Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) information in response to a Physical Downlink Shared Channel (PDSCH) transmission based on uplink HARQ-ACK timing,wherein, in a case that the UE is configured to use at least one frequency division duplexing (FDD) cell and at least one time division duplexing (TDD) cell, the UE is configured to use a primary cell which is an FDD cell, the UE is configured to use a secondary cell which is a TDD cell, and the UE is not configured to apply a dynamic UL/DL reconfiguration for the secondary cell, the uplink HARQ-ACK timing for the TDD cell follows uplink HARQ-ACK timing for the FDD cell such that the HARQ-ACK information is sent four subframes after a subframe for the PDSCH transmission.

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