US Patent No. 9,241,289


Patent No. 9,241,289
Issue Date January 19, 2016 
Title Dynamic Adjustment Of Cell Reselection Parameters For A Wireless Communication Device
Inventorship Siddharth Oroskar, Overland Park, KS (US)
Ryan P. Dreiling, Lenexa, KS (US)
Maulik K. Shah, Overland Park, KS (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,241,289

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.