US 7,444,150 B2 · Cell reselection with power scan and parallel decoding

Abstract

Upon power on, a terminal performs cell selection, finds the most suitable cell to receive communication service, and camps on this cell (the serving cell). The terminal thereafter performs “C2-based” cell reselection if a better cell is found, “non-C2 based” cell reselection if the current serving cell cannot be camped on, “power scan” cell reselection if the C2-based or non-C2 based cell reselection fails, and cell selection if the power scan cell reselection fails. For the power scan cell reselection, the terminal initially performs a power scan and obtains received signal strength measurements for a list of RF channels. This list includes fewer than all RF channels evaluated by the cell selection. The terminal then acquires and decodes the N strongest RF channels, preferably in parallel, to find a suitable cell. The terminal selects a suitable cell, if found, with the highest C2 value as the new serving cell from which to receive service.

Claims30

Dependent claims

A wireless device in a communication system, comprising:

a receiver unit operative to scan a list of radio frequency channels to find a current cell to receive communication service, and from the list of radio frequency channels identify a first list of radio frequency channels for switching from the current cell to a new serving cell;
and
a controller operative to obtain a second list of radio frequency channels from the first list to initiate selection of the new serving cell, wherein if the number of radio frequency channels in the second list exceeds one, the radio frequency channels in the second list are processed in parallel such that the controller directs the receiver unit to acquire each of the frequency channels in the second list for decoding at a scheduled time for determining as a candidate for the channel of the new serving cell.

A device in a communication system, comprising:

means for scanning an initial list of radio frequency channels to find a current cell to receive communication service;
means for identifying a first list of radio frequency channels from the initial list of radio frequency channels for switching from the current cell to a new serving cell;
means for providing a second list of radio frequency channels from the first list to initiate selection of the new serving cell;
and
means for parallel processing the radio frequency channels in the second list if the number of radio frequency channels in the second list exceeds one, via acquiring each of the frequency channels in the second list for decoding at a scheduled time for determining as a candidate for the channel of the new serving cell.

2 more elements

Dependencies are inferred from the claim text.

Cell reselection with power scan and parallel decoding

Life of this patent

Cell reselection with power scan and parallel decoding

Life of this patent

Abstract

Claims30