Method and apparatus for radio link failure recovery in a telecommunication system
First Claim
1. A method in a user terminal of reducing radio link failure recovery time, wherein the user terminal recovers from radio link failures by selecting a cell in a wireless communication network for reconnecting, said method comprising:
- after detecting a radio link failure, detecting cells available for use by the user terminal in reconnecting to the wireless communication network and measuring the signal strength of the detected cells;
determining whether any of the detected cells have been predefined for use by the user terminal for recovering from radio link failure, wherein a cell is predefined if it is one known or predicted to have user context for the user terminal;
thereafter, evaluating whether the predefined cell meets a signal strength threshold; and
after the evaluating, attempting radio link failure recovery first through the predefined cell if the predefined cell meets the signal strength threshold.
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Accused Products
Abstract
The teachings presented herein enable a user terminal to perform a fast recovery from a radio link failure. In one aspect, the improvement in recovery time is achieved by commanding or otherwise causing the user terminal to perform radio link failure (RLF) recovery at a cell that is known to possess the user context, while considering that this cell should yield good radio conditions (if not the best) to the user terminal. A cell may be predefined for use by the user terminal in recovering its radio connection. Based on providing signal strength thresholds to the user terminal, for use in determining whether to use a predefined cell for reconnecting to the network, the user terminal attempts RLF recovery first in the predefined cell. By providing user context to the predefined cell in advance of a recovery attempt by the user terminal, the time for recovery is lessened. Note that the user terminal also may infer which cells are preferred.
12 Citations
17 Claims
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1. A method in a user terminal of reducing radio link failure recovery time, wherein the user terminal recovers from radio link failures by selecting a cell in a wireless communication network for reconnecting, said method comprising:
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after detecting a radio link failure, detecting cells available for use by the user terminal in reconnecting to the wireless communication network and measuring the signal strength of the detected cells; determining whether any of the detected cells have been predefined for use by the user terminal for recovering from radio link failure, wherein a cell is predefined if it is one known or predicted to have user context for the user terminal; thereafter, evaluating whether the predefined cell meets a signal strength threshold; and after the evaluating, attempting radio link failure recovery first through the predefined cell if the predefined cell meets the signal strength threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A user terminal configured to recover from radio link failures by selecting a cell in a wireless communication network for reconnecting, said user terminal configured to:
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after detecting a radio link failure, detect cells available for use by the user terminal in reconnecting to the wireless communication network and measure received signal strengths of the detected cells; determine whether any of the detected cells have been predefined for use by the user terminal for recovering from radio link failure, wherein a predefined cell is one known or predicted to have user context for the user terminal; thereafter, evaluate whether the predefined cell meets a signal strength threshold; and after the evaluation, attempt radio link failure recovery first through the predefined cell, if the predefined cell meets the signal strength threshold.
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14. A method in a base station of a wireless communication network of supporting recovery from radio link failure by a user terminal, said method comprising:
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determining a signal strength threshold to be used by a user terminal in evaluating whether the user terminal should attempt radio link failure recovery in a cell predefined for such use, or should attempt radio link failure recovery in a cell offering a best measured received signal strength, wherein a cell is predefined if it is one known or predicted to have user context for the user terminal; and signaling the signal strength threshold to be used, for reception by the user terminal. - View Dependent Claims (15, 16)
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17. A base station configured for use in a wireless communication network, said base station configured to support recovery from radio link failure by a user terminal based on being configured to:
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determine a signal strength threshold to be used by a user terminal in evaluating whether the user terminal should attempt radio link failure recovery in a cell predefined for such use, or should attempt radio link failure recovery in a cell offering a best measured received signal strength, wherein a cell is predefined if it is one known or predicted to have user context for the user terminal; and signal the signal strength threshold to be used, for reception by the user terminal.
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Specification