| 摘要 |
A communication device (100) contains a plurality of bandmaps in a memory (102). Upon powering up the device, the device first scans frequencies listed in a learned bandmap (104). If no suitable carrier signals are detected, the device scans the frequencies listed in a present regional bandmap (106), and this scan may be repeated several times. Upon failing to detect a suitable carrier at any of the frequencies listed in the present regional bandmap, the device alternates between scanning the present regional bandmap and segments of a world wide bandmap (108), which is a comprehensive list of all possible frequencies at which the device may operate. If a carrier is detected indicating the device is in a new region, the regional bandmap corresponding to the new region is set to be used as the present regional bandmap.
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