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Wireless telecommunications network nodes and methods

  • US 10,009,812 B2
  • Filed: 08/20/2014
  • Issued: 06/26/2018
  • Est. Priority Date: 09/26/2013
  • Status: Active Grant
First Claim
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1. A method, performed by a wireless telecommunications network node, comprising:

  • determining a cause of a radio link failure in at least one of uplink and downlink which occurred when a user equipment is in proximity to an uplink-downlink imbalance region, which is a region between a downlink boundary of a small cell and a macro cell, said downlink boundary being where received pilot power from said macro cell and received pilot power from said small cell are the same and an uplink boundary of said small cell and said macro cell, said uplink boundary being where uplink path loss to said macro cell and to said small cell are the same, comprising determining that said radio link failure occurred due to one of uplink-downlink decoupling in which uplink and downlink streams are served by different cells, and uplink-downlink recoupling in which uplink and downlink streams are served by a same cell, occurring one of too early and too late; and

    in response to said cause of said radio link failure, initiating action to optimize control of user equipment uplink-downlink decoupling-recoupling when in proximity to said uplink-downlink imbalance region by adjusting control of user equipment to perform a corresponding one of uplink-downlink decoupling and uplink-downlink recoupling a corresponding one of later and earlier than previously;

    wherein said determining comprises determining that said radio link failure occurred in uplink due to at least one of;

    uplink-downlink decoupling occurring too late when higher than a threshold amount of interference is received on said uplink by said network node, followed by a handover of user equipment to said network node coinciding with a reduction in said interference and said initiating action comprises optimising control of user equipment to perform uplink-downlink decoupling earlier than previously;

    uplink-downlink recoupling occurring too early when higher than a threshold amount of interference is received on said uplink by said network node following an uplink-downlink recoupling of user equipment, followed by a handover of user equipment to said network node coinciding with a reduction in said interference and said initiating action comprises optimising control of user equipment to perform uplink-downlink recoupling later than previously;

    uplink-downlink recoupling occurring too late when said radio link failure in uplink occurred following an uplink-downlink recoupling of user equipment following an uplink-downlink decoupling of said user equipment for greater than a threshold amount of time and said initiating action comprises optimising control of user equipment to perform uplink-downlink recoupling earlier than previously; and

    uplink-downlink decoupling occurring too early when said radio link failure in uplink occurred within a threshold amount of time following an uplink-downlink decoupling of user equipment and said initiating action comprises optimising control of user equipment to perform uplink-downlink decoupling later than previously.

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