Mobile communications system, base station, and mobile terminal
First Claim
1. A mobile communications system based on the CDMA standard and having a mobile terminal and a base station, comprising:
- communication means for using a first communication channel to conduct communication relating to a first call between the mobile terminal and the base station;
determining means for determining a first time and a second time mutually between the mobile terminal and the base station;
sync-establishing means for, when the first time is reached, having the communication means cease communication using the first communication channel, and attempting to establish synchronization between the mobile terminal and the base station in order to commence using a second communication channel to conduct communication relating to both the first call and a second call; and
recommencing means for, if synchronization cannot be established before the second time is reached, having the sync-establishing means cease attempts to establish synchronization, and having the communication means recommence using the first communication channel to conduct communication relating to the first call.
1 Assignment
0 Petitions
Accused Products
Abstract
A mobile terminal 11 and a base station 12 use a first communication channel (i.e. a transmission route 21) to conduct communication relating to a first call. A first time (i.e. switching time) and a second time (i.e. switching-back time) during the communication are determined, and when the switching time is reached, communication using transmission route 21 is ceased and attempts are made to establish spreading code synchronization in order for mobile terminal 11 and base station 12 to commence using a second communication channel (i.e. a transmission route 22) to conduct communication relating to both the first call and a second call. If synchronization cannot be established before the switching-back time is reached, attempts to establish synchronization are ceased, and mobile terminal 11 and base station 12 recommence using transmission route 21 to conduct communication.
17 Citations
8 Claims
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1. A mobile communications system based on the CDMA standard and having a mobile terminal and a base station, comprising:
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communication means for using a first communication channel to conduct communication relating to a first call between the mobile terminal and the base station;
determining means for determining a first time and a second time mutually between the mobile terminal and the base station;
sync-establishing means for, when the first time is reached, having the communication means cease communication using the first communication channel, and attempting to establish synchronization between the mobile terminal and the base station in order to commence using a second communication channel to conduct communication relating to both the first call and a second call; and
recommencing means for, if synchronization cannot be established before the second time is reached, having the sync-establishing means cease attempts to establish synchronization, and having the communication means recommence using the first communication channel to conduct communication relating to the first call. - View Dependent Claims (2, 3)
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4. A mobile communications system based on the CDMA standard and having a mobile terminal and a base station, the base station including:
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first communication means for using a first communication channel to conduct communication relating to a first call with the mobile terminal; and
second communication means for, in parallel with communication conducted by the first communication means, using a second communication channel to conduct communication relating to both the first call and a second call with the mobile terminal, and the mobile terminal including;
third communication means for using the first communication channel to conduct communication relating to the first call with the base station;
storage means for storing in advance a first time and a second time;
sync-establishing means for, when the first time is reached, having the third communication means cease communication using the first communication channel, and attempting to establish synchronization with the base station in order to commence using the second communication channel to conduct communication relating to both the first and second calls; and
recommencing means for, if synchronization cannot be established before the second time is reached, having the sync-establishing means cease attempts to establish synchronization, and having the third communication means recommence using the first communication channel to conduct communication relating to the first call. - View Dependent Claims (5)
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6. A mobile terminal used in a mobile communications system based on the CDMA standard, comprising:
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communication means for using a first communication channel to conduct communication relating to a first call with a base station;
storage means for storing in advance a first time and a second time;
sync-establishing means for, when the first time is reached, having the communication means cease communication using the first communication channel, and attempting to establish synchronization with the base station in order to commence using a second communication channel to conduct communication relating to both the first call and a second call; and
recommencing means for, if synchronization cannot be established before the second time is reached, having the sync-establishing means cease attempts to establish synchronization, and having the communication means recommence using the first communication channel to conduct communication relating to the first call.
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7. A method for conducting mobile communications between a mobile terminal and a base station based on the CDMA standard, comprising:
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a communication step of using a first communication channel to conduct communication relating to a first call between the mobile terminal and the base station;
a determining step of determining a first time and a second time mutually between the mobile terminal and the base station;
a sync-establishing step of, when the first time is reached, ceasing communication using the first communication channel, and attempting to establish synchronization between the mobile terminal and the base station in order to commence using a second communication channel to conduct communication relating to both the first call and a second call; and
a recommencing step of, if synchronization cannot be established before the second time is reached, ceasing attempts to establish synchronization, and recommencing use of the first communication channel to conduct communication relating to the first call.
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8. A method for conducting mobile communications between a mobile terminal and a base station based on the CDMA standard, comprising:
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a first communication step performed in the base station, and of using a first communication channel to conduct communication relating to a first call with the mobile terminal;
a second communication step performed in the base station, and of, in parallel with communication conducted in the first communication step, using a second communication channel to conduct communication relating to both the first call and a second call with the mobile terminal;
a third communication step performed in the mobile terminal, and of using the first communication channel to conduct communication relating to the first call with the base station;
a sync-establishing step performed in the mobile terminal, and of (i) storing a first time and a second time in an internal memory of the mobile terminal, and (ii) when the first time is reached, ceasing communication using the first communication channel, and attempting to establish synchronization with the base station in order to commence using the second communication channel to conduct communication relating to both the first and second calls; and
a recommencing step of, if synchronization cannot be established before the second time is reached, ceasing attempts to establish synchronization, and recommencing use of the first communication channel to conduct communication relating to the first call.
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Specification