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Radio coexistence in wireless networks

  • US 9,681,382 B2
  • Filed: 02/01/2013
  • Issued: 06/13/2017
  • Est. Priority Date: 05/11/2012
  • Status: Active Grant
First Claim
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1. A method for reducing coexistence interference in a multi-radio device, comprising:

  • receiving a discontinuous reception (DRX) configuration at the multi-radio device from an enhanced Node B (eNodeB), wherein the multi-radio device is a user equipment having a plurality of radio transceivers;

    applying the discontinuous reception (DRX) configuration to at least one of the plurality of radio transceivers in the multi-radio device, wherein the DRX includes a long DRX cycle for the at least one of the plurality of radio transceivers;

    selecting one of a 2 milliseconds (ms), 5 ms, and 8 ms cycle start offset period for the long DRX cycle to reduce coexistence interference between the plurality of radio transceivers in the multi-radio device;

    applying a 2 ms, 5 ms, or 8 ms long DRX cycle to provide additional DRX patterns to reduce in-device interference, wherein the 2 ms long DRX cycle and the 5 ms long DRX cycle provides a plurality of Hybrid Automatic Repeat Request (HARQ) reservation patterns for Long Term Evolution (LTE) Time Division Duplex (LTE-TDD) and the 8 ms long DRX cycle corresponds to eight HARQ reservation patterns for LTE Frequency Division Duplex (FDD);

    selecting a downlink channel state information (CSI) reference resource subframe with no in-device interference from the plurality of radio transceivers in the multi-radio device, wherein the downlink CSI reference resource subframe with no in-device interference that is selected is within an unscheduled period of the long DRX cycle, wherein CSI for the multi-radio device is determined using the selected downlink CSI reference resource subframe with no in-device interference to obtain an accurate CSI for the multi-radio device; and

    periodically reporting the CSI, from the multi-radio device to an evolved node B (eNB), at a CSI reporting subframe, wherein the CSI reporting subframe is located at least four subframes after the downlink CSI reference resource subframe such that the CSI reporting subframe is not impacted by in-device interference, wherein the CSI is reported during a transition from the unscheduled period of the long DRX cycle to a scheduling period of a subsequent long DRX cycle.

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