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Flexible subframes

  • US 9,743,405 B2
  • Filed: 04/18/2016
  • Issued: 08/22/2017
  • Est. Priority Date: 12/23/2009
  • Status: Active Grant
First Claim
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1. A radio terminal for use in a radio communications network, comprising:

  • electronic circuitry configured to process data for or from a frame structure that includes one or more downlink subframes preconfigured as a downlink subframe, one or more uplink subframes preconfigured as an uplink subframe, and one or more flexible subframes, where a flexible subframe is dynamically allocated to be an uplink subframe in one instance of a frame and a downlink subframe in another frame instance, wherein the radio terminal is configured to interpret all flexible subframes as downlink subframes unless specific information is communicated to the radio terminal indicating that a particular flexible subframe should be interpreted or used as an uplink subframe;

    receive circuitry configured to;

    receive and process information sent by a base station in a flexible subframe; and

    receive, in a subframe prior to the particular flexible subframe, information indicating when the particular flexible subframe should be interpreted or used as an uplink subframe; and

    transmit circuitry configured to;

    transmit information to the base station in an uplink direction using the particular flexible subframe as a uplink subframe; and

    transmit information directly to another radio terminal thereby bypassing the base station using a second flexible subframe.

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