| 摘要 |
Position information is communicated with improved reliability and accuracy. A standby state in step S1 is followed by step S2 where entry of an emergency call instruction is awaited. Upon entry of an emergency call instruction (Yes), a detailed positioning notification is carried out in step S3. In step S4 a dial callout is carried out and in step S5, it is determined whether or not there is an outgoing-call terminating instruction. If there is an outgoing-call terminating instruction, the process proceeds to step S10 and if not, it proceeds to step S6 where it is determined whether or not there is a response. If not (No), the process returns to step S5. If there is a response (Yes), a call is made in step S7, followed by step S8 where a simplified positioning notification is carried out (by which draft latitude/longitude information is transmitted to a call server). In step S9, a call terminate instruction is awaited. Upon a call terminate instruction (Yes), it is determined in step S10 whether or not there is another emergency call instruction. If there is another emergency call instruction, the process returns to step S4. In the absence of another emergency call instruction (No), it is determined in step S11 whether or not the detailed position notification has been completed (step S11). If not (No), the process returns to step S4, and if it has been (Yes), it proceeds to step S12 where the portable terminal enters into a standby state.
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