| 摘要 |
A multi-mode mobile radiotelephone is operable in more than one communication system, such as in both a GSM and satellite system which use different frequency bands. The mobile phone stores network preference data identifying a level of priority for each system, and scans one system for a channel more often than other systems. In one embodiment, a mobile phone is operable in a terrestrial system and a satellite system, and scans the terrestrial band every 30 seconds and the satellite band every 2 minutes when not camped on either system. When camped on a satellite network channel the mobile scans the terrestrial band every 2 minutes. When camped on a terrestrial channel the mobile scans the satellite band every 5 minutes. Power consumption is thus reduced by scanning some frequency bands less often. |
