Method and apparatus for identifying interference type in time division duplex systems
AssigneeResearch In Motion Limited
InventorsYiping WANG, Jianfeng WENG, Jun LI
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Abstract
Methods and apparatus at an evolved Node B (eNB) and user equipment (UE) in cells operating in time division duplex with a first configuration and having a neighbor cell eNB operating in time division duplex with a second configuration, the methods and apparatus: identifying potential eNB-to-eNB; UE-to-UE; eNB-to-UE; and UE-to-eNB interference. Further methods and apparatus to report interference including enumerated interference types to neighbor cell eNBs. Further, methods and apparatus for interference mitigation.
Claims35
A method at an evolved Node B (eNB) for a cell operating in time division duplex with a first configuration and having a neighbor cell eNB operating in time division duplex with a second configuration, the method comprising:
- identifying whether a subframe has a potential for eNB-to-eNB interference;
- correlating a received signal with a locally generated cell specific reference signal according to an identifier for the neighbor cell eNB;
- and
- determining that eNB-to-eNB interference exists in the subframe if results of the correlating exceed a threshold.
An evolved Node B (eNB) for a cell and operating in time division duplex with a first configuration and having a neighbor cell eNB operating in time division duplex with a second configuration, the evolved Node B comprising:
- a processor;
- and
- a communications subsystem,
- wherein the eNB is configured to:
- identify whether a subframe has a potential for eNB-to-eNB interference;
- correlate a received signal with a locally generated cell specific reference signal according to an identifier for the neighbor cell eNB;
- and
- determine that eNB-to-eNB interference exists in the subframe if results of the correlating exceed a threshold.
20-36. (canceled)
A method at an evolved Node B (eNB) for a cell operating in time division duplex with a first configuration and having a neighbor cell eNB operating in time division duplex with a second configuration, the method comprising:
- identifying whether a subframe has a potential for UE-to-UE interference;
- calculating a first negative acknowledgment (NAK) rate base on a percentage of NAKs received from a user equipment in a first set of subframes;
- calculating a second NAK rate base on a percentage of NAKs received from the user equipment in a second set of subframes;
- and
- determining that UE-to-UE interference exists in the first NAK rate exceeds the second NAK rate by a threshold.
An evolved Node B (eNB) for a cell and operating in time division duplex with a first configuration and having a neighbor cell eNB operating in time division duplex with a second configuration, the eNB comprising:
- a processor;
- and
- a communications subsystem,
- wherein the eNB is configured to:
- identify whether a subframe has a potential for UE-to-UE interference;
- calculate a first negative acknowledgment (NAK) rate base on a percentage of NAKs received from a user equipment in a first set of subframes;
- calculate a second NAK rate base on a percentage of NAKs received from the user equipment in a second set of subframes;
- and
- determine that UE-to-UE interference exists in the first NAK rate exceeds the second NAK rate by a threshold.
51-82. (canceled)
Dependencies are inferred from the claim text.