| 摘要 |
When a mobile communication terminal unit is using a particular one of a plurality of systems, the mobile communication terminal unit determines whether or not there is a higher priority system than the current system (at step 102). When there is a higher priority system, just before starting monitoring the higher priority system, the mobile communication terminal unit informs the current base station of the monitoring process for the higher priority system and requests the base station to suspend a call to be sent to the mobile communication terminal unit (at step 103). The mobile communication terminal unit monitors the higher priority system and records the monitored result (at step 104). After having monitored the higher priority system (at step 105), the mobile communication terminal unit informs the current base station of the restoration to the current system and requests the base station to cancel the suspension of a call to the mobile communication terminal unit (at step 106).
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