Dynamic adjustment of cell reselection parameters for a wireless communication device
First Claim
1. A method of operating a wireless communication device to facilitate cell reselection, the method comprising:
- achieving downlink timing synchronization with a cell associated with a wireless access node based on information broadcast by the wireless access node over a synchronization signal;
performing a number of attempts to achieve uplink timing synchronization with the cell, wherein each of the attempts includes transmitting a preamble identifier over a random access channel to the wireless access node and waiting a time period to receive a positive acknowledgement;
if the number of attempts to achieve the uplink timing synchronization with the cell exceeds a threshold amount without receiving the positive acknowledgement, applying an offset to cell reselection parameters to generate modified cell reselection parameters;
responsive to the modified cell reselection parameters satisfying cell reselection criteria, performing both intra-frequency and inter-frequency measurements for potential cell reselection; and
selecting a different cell for potential synchronization based on the intra-frequency and the inter-frequency measurements.
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Accused Products
Abstract
A method of operating a wireless communication device to facilitate cell reselection comprises achieving downlink timing synchronization with a cell associated with a wireless access node based on information broadcast by the wireless access node over a synchronization signal, and performing a number of attempts to achieve uplink timing synchronization with the cell, wherein each of the attempts includes transmitting a preamble identifier and waiting to receive a positive acknowledgement. The method further comprises, if the number of attempts to achieve the uplink timing synchronization with the cell exceeds a threshold amount without receiving the positive acknowledgement, applying an offset to cell reselection parameters to generate modified cell reselection parameters, and responsive to the modified cell reselection parameters satisfying cell reselection criteria, performing both intra-frequency and inter-frequency measurements for potential cell reselection and selecting a different cell for potential synchronization based on the intra-frequency and the inter-frequency measurements.
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Citations
20 Claims
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1. A method of operating a wireless communication device to facilitate cell reselection, the method comprising:
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achieving downlink timing synchronization with a cell associated with a wireless access node based on information broadcast by the wireless access node over a synchronization signal; performing a number of attempts to achieve uplink timing synchronization with the cell, wherein each of the attempts includes transmitting a preamble identifier over a random access channel to the wireless access node and waiting a time period to receive a positive acknowledgement; if the number of attempts to achieve the uplink timing synchronization with the cell exceeds a threshold amount without receiving the positive acknowledgement, applying an offset to cell reselection parameters to generate modified cell reselection parameters; responsive to the modified cell reselection parameters satisfying cell reselection criteria, performing both intra-frequency and inter-frequency measurements for potential cell reselection; and selecting a different cell for potential synchronization based on the intra-frequency and the inter-frequency measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless communication device to facilitate cell reselection, the wireless communication device comprising:
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a wireless communication transceiver; and a processing system configured to achieve downlink timing synchronization with a cell associated with a wireless access node based on information broadcast by the wireless access node over a synchronization signal; the processing system configured to perform a number of attempts to achieve uplink timing synchronization with the cell, wherein each of the attempts includes the processing system configured to direct the wireless communication transceiver to transmit a preamble identifier over a random access channel to the wireless access node and wait a time period to receive a positive acknowledgement; the processing system configured to, if the number of attempts to achieve the uplink timing synchronization with the cell exceeds a threshold amount without receiving the positive acknowledgement, apply an offset to cell reselection parameters to generate modified cell reselection parameters; the processing system configured to, responsive to the modified cell reselection parameters satisfying cell reselection criteria, direct the wireless communication transceiver to perform both intra-frequency and inter-frequency measurements for potential cell reselection; and the processing system configured to select a different cell for potential synchronization based on the intra-frequency and the inter-frequency measurements. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer apparatus to facilitate cell reselection, the apparatus comprising:
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software instructions configured, when executed by a wireless communication device, to direct the wireless communication device to achieve downlink timing synchronization with a cell associated with a wireless access node based on information broadcast by the wireless access node over a synchronization signal, perform a number of attempts to achieve uplink timing synchronization with the cell, wherein each of the attempts includes transmitting a preamble identifier over a random access channel to the wireless access node and waiting a time period to receive a positive acknowledgement, and if the number of attempts to achieve the uplink timing synchronization with the cell exceeds a threshold amount without receiving the positive acknowledgement, apply an offset to cell reselection parameters to generate modified cell reselection parameters; the software instructions further configured to direct the wireless communication device to, responsive to the modified cell reselection parameters satisfying cell reselection criteria, perform both intra-frequency and inter-frequency measurements for potential cell reselection and select a different cell for potential synchronization based on the intra-frequency and the inter-frequency measurements; and at least one non-transitory computer-readable storage medium storing the software instructions. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification