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US 8,787,177 B2Granted
Techniques for radio link problem and recovery detection in a wireless communication system
AssigneeApple Inc.
InventorsIan Wong, Taeyoon Kim
Life of this patent
Estimating the term…
Abstract
A technique for radio link detection in a wireless communication system includes estimating a first error rate of an indicator channel. In this case, the indicator channel includes an indication of a number of symbols in a control channel. A second error rate of the control channel is also estimated. The first and second error rates are then combined to provide a performance metric. Based on the performance metric, a determination is made as to whether a radio link problem exists.
Claims38
A method for radio link detection in a wireless communication system, comprising:
- at a subscriber station, estimating a first error rate of an indicator channel, wherein the indicator channel includes an indication of a number of symbols in a control channel;
- where the estimating of the first error rate is based on one or more reference signals associated with the indicator channel;
- estimating a second error rate of the control channel;
- where the estimating of the second error rate is based on one or more reference signals associated with the control channel;
- combining the first error rate of the indicator channel with the second error rate of the control channel to provide a combined performance metric based on both the indicator channel and the control channel;
- determining whether a radio link problem exists based on the combined performance metric exceeding a first threshold;
- and if the radio link problem exists, disabling transmission by the subscriber station.
4 more elements
A wireless communication device, comprising:
- a transmitter;
- a receiver;
- and a processor coupled to the receiver, wherein the processor is configured to:
- estimate a first error rate of an indicator channel, wherein the indicator channel includes an indication of a number of symbols in a control channel, estimate a second error rate of the control channel;
- combine the first error rate of the indicator channel with the second error rate of the control channel to provide a combined performance metric based on both the indicator channel and the control channel, where the combined performance metric comprises an estimated combined Block Error Rate (BLER) of the indicator channel and the control channel;
- and determine whether a radio link problem exists based on the combined performance metric exceeding a first threshold, wherein the processor is further configured to, when the radio link problem exists, power down the transmitter.
3 more elements
A method for radio link detection in a wireless communication system, comprising:
- estimating a first signal-to-interference and noise ratio (SINR) for a control channel based on one or more reference signals associated with the control channel;
- estimating a second SINR for an indicator channel based on one or more reference signals associated with the indicator channel, wherein the indicator channel provides an indication of a number of symbols in the control channel;
- generating a combined effective SINR by combining both the first SINR for the control channel with the second SINR of the indicator channel;
- mapping the combined effective SINR to a block error rate;
- determining whether a radio link problem, a radio link failure, or a radio link recovery exists based on the block error rate exceeding a threshold;
- and if the radio link failure exists, reporting the radio link failure.
3 more elements
A method for radio link detection in a wireless communication system, comprising:
- estimating a first error rate of an indicator channel, wherein the indicator channel includes an indication of a number of symbols in a control channel;
- where the estimating of the first error rate is based on one or more reference signals associated with the indicator channel;
- estimating a second error rate of a control channel;
- where the estimating of the second error rate is based on one or more reference signals associated with the control channel;
- combining the first error rate of the indicator channel with the second error rate of the control channel to provide a combined performance metric based on both the indicator channel and the control channel;
- determining if a radio link problem exists based on the combined performance metric exceeding a threshold;
- and if the radio link problem exists, causing a subscriber station to disable transmission.
4 more elements
A wireless communication device, comprising:
- a transmitter;
- a receiver;
- and a processor coupled to the receiver, wherein the processor is configured to:
- estimate a first error rate of an indicator channel, wherein the indicator channel includes an indication of a number of symbols in a control channel;
- estimate a second error rate of the control channel;
- where the estimate of the first and second error rates are based on one or more channel estimates;
- combine the first error rate of the indicator channel with the second error rate of the control channel to provide a combined performance metric based on both the indicator channel and the control channel;
- and detecting if a radio link problem exists based on the combined performance metric exceeding a threshold, wherein if the radio link problem exists, powering down the transmitter.
5 more elements
A method for radio link detection in a wireless communication system, comprising:
- estimating a first error rate of an indicator channel, wherein the indicator channel includes an indication of a number of symbols in a control channel;
- where the estimating of the first error rate is based on one or more reference signals associated with the error channel;
- estimating a second error rate of a control channel;
- where the estimating of the second error rate is based on one or more reference signals associated with the control channel;
- combining the first and second error rates to provide a performance metric, where the first and second error rates are scaled and then added together to provide the performance metric;
- determining whether a radio link problem exists based on the performance metric;
- and
- when the radio link problem exists, causing a subscriber station to disable transmission.
5 more elements
A wireless communication device, comprising:
- a transmitter;
- a receiver;
- and computerized logic in data communication with to the receiver and transmitter, the logic configured to enable the wireless communication device to:
- estimate a first error rate of an indicator channel, the indicator channel comprising an indication of a number of symbols in a control channel;
- estimate a second error rate of the control channel;
- combine the first error rate of the indicator channel with the second error rate of the control channel to provide a combined performance metric based on both the indicator channel and the control channel, the combined performance metric comprising an estimated combined Block Error Rate (BLER) of the indicator channel and the control channel;
- and determine whether a radio link problem exists based on at least the combined performance metric exceeding a first threshold;
- and wherein the logic is further configured to, when the radio link problem exists, power down the transmitter.
5 more elements
Dependencies are inferred from the claim text.