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Narrowband time-division duplex frame structure for narrowband communications

  • US 10,524,258 B2
  • Filed: 10/03/2017
  • Issued: 12/31/2019
  • Est. Priority Date: 02/15/2017
  • Status: Active Grant
First Claim
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1. A method of wireless communications for a base station, comprising:

  • determining a narrowband time-division duplex (TDD) frame structure of a group of narrowband TDD frame structures for narrowband communications;

    determining a first subframe group associated with a first set of downlink subframes and a first scrambling sequence, the first set of downlink subframes including a first downlink subframe and a predetermined first number of following subframes;

    determining a second subframe group associated with a second set of downlink subframes and a second scrambling sequence, the second set of downlink subframes including a second downlink subframe and a predetermined second number of following subframes, and wherein the first subframe group and the second subframe group do not overlap; and

    transmitting a series of repetitions of a narrowband physical downlink channel using the narrowband TDD frame structure,wherein a first portion of repetitions from the series of repetitions is transmitted in the first set of downlink subframes using the first scrambling sequence; and

    wherein a second portion of repetitions from the series of repetitions is transmitted in the second set of downlink subframes using the second scrambling sequence.

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