Forward handover under radio link failure
First Claim
1. A method for facilitating handover in wireless system, the method comprising:
- establishing a radio link failure (RLF) criterion by configuring an autonomously optimized threshold for a channel quality metric;
receiving an indication of a radio link failure (RLF) condition when the RLF criterion is fulfilled, wherein the indication of the RLF condition includes a NULL channel quality indicator of RLF onset;
triggering a RLF timer upon receiving the indication, wherein the RLF timer is selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and
triggering preparation for handover in response to the NULL channel quality indicator of RLF onset.
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Abstract
System(s) and method(s) are provided for forward handover under radio link failure. A configurable criterion for radio link failure (RLF) is established through a reference threshold for a channel quality metric; the threshold (CQITH) can be determined at least on a quality-of-service basis or a per-terminal basis. A low-overhead indication of RLF is conveyed as a NULL CQI when the channel quality metric is below threshold. Onset of RLF triggers preparation of forward handover (FHO) at a terminal within a predetermined timer, during which normal service can resume if link quality recovers above CQITH. Forward handover is pursued once timer elapses. Preparation at the terminal can be complemented by preparation implemented in advanced to RLF condition, in accordance to a disparate threshold applied to terminal'"'"'s measurements. Preparation of FHO includes backhaul exchange of operational information like buffered data, and context.
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Citations
53 Claims
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1. A method for facilitating handover in wireless system, the method comprising:
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establishing a radio link failure (RLF) criterion by configuring an autonomously optimized threshold for a channel quality metric; receiving an indication of a radio link failure (RLF) condition when the RLF criterion is fulfilled, wherein the indication of the RLF condition includes a NULL channel quality indicator of RLF onset; triggering a RLF timer upon receiving the indication, wherein the RLF timer is selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and triggering preparation for handover in response to the NULL channel quality indicator of RLF onset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device that operates in a wireless environment, the device comprising:
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a processor configured to set a configurable and autonomously optimized threshold for a channel quality metric; to receive an indication of a radio link failure (RLF) condition when a channel quality metric is below the threshold, wherein the indication of the RLF condition includes a NULL channel quality indicator of RLF onset; to trigger a RLF timer upon receiving the indication, and wherein the RLF timer is selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and to trigger preparation for handover in response to the NULL channel quality indicator of RLF onset; and a memory coupled to the processor. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus that operates in a wireless environment, the apparatus comprising:
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means for configuring an autonomously optimized threshold for a channel quality metric; means for conveying the threshold for the channel quality metric; means for receiving an indication of a radio link failure (RLF) condition when a channel quality metric is below threshold, wherein the indication of the RLF condition includes a NULL channel quality indicator of RLF onset; means for triggering a RLF timer upon receiving the indication, wherein the RLF timer is selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and means for triggering preparation for handover in response to the NULL channel quality indicator of RLF onset.
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31. A non-transitory computer-readable medium storing a computer program, wherein execution of the computer program is for:
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configuring an autonomously optimized threshold for a channel quality metric to determine a radio link failure (RLF) criterion; conveying the threshold for the channel quality metric; receiving an indication of a radio link failure (RLF) condition when the channel quality metric is below threshold, wherein the indication of the RLF condition includes a NULL channel quality indicator of RLF onset; triggering a RLF timer upon receiving the indication, wherein the RLF timer is selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and triggering preparation for handover in response to the NULL channel quality indicator of RLF onset. - View Dependent Claims (32)
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33. A method for forward handover under link failure in a wireless system, the method comprising:
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receiving a configurable channel quality metric threshold, the channel quality metric threshold being autonomously optimized and establishes a radio link failure (RLF) criterion; conveying an indication of a RLF condition when a channel quality metric is below the threshold, wherein the indication of the RLF condition includes a NULL channel quality indicator of RLF onset, and reception of the indication triggers an RLF timer selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; preparing for forward handover triggered by the NULL channel quality indicator of RLF onset; and pursuing forward handover. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. An apparatus that operates in a wireless environment, the apparatus comprising:
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a processor configured to receive a channel quality metric threshold which determines a radio link failure (RLF) criterion and wherein the channel quality metric threshold is autonomously optimized; to generate a channel quality metric; to convey a channel quality indicator (CQI) report that indicates a RLF condition as a NULL channel quality indicator of RLF onset when the channel quality metric is below the channel quality metric threshold, wherein reception of the CQI report triggers an RLF timer selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and to prepare for forward handover triggered by the NULL channel quality indicator of RLF onset; and memory coupled to the processor. - View Dependent Claims (41, 42, 43, 44, 45)
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46. A wireless device comprising:
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means for receiving a radio link failure (RLF) criterion, wherein the RLF criterion is determined by an autonomously optimized threshold for a channel quality metric; means for conveying an indication of a RLF condition as a NULL channel quality indicator of RLF onset when the RLF criterion is fulfilled, wherein reception of the indication triggers an RLF timer selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; means for preparing for forward handover triggered by the NULL channel quality indicator of RLF onset; and means for pursuing forward handover. - View Dependent Claims (47, 48, 49)
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50. A non-transitory computer readable medium storing a computer program, wherein execution of the computer program is for:
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receiving a channel quality metric threshold, wherein the channel quality metric threshold is autonomously optimized; conveying an indication of a radio link failure (RLF) condition as a NULL channel quality indicator of RLF onset when a channel quality metric is below the channel quality metric threshold, wherein reception of the indication triggers an RLF timer selected to mitigate excessive forward handover pursuits and ensuing target cell attachments; and pursuing forward handover triggered by the NULL channel quality indicator of RLF onset. - View Dependent Claims (51, 52, 53)
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Specification