Personal handy phone system
First Claim
1. A personal handy phone system comprising a private branch exchange network including a private branch exchange connected to a public PHS network and a private PHS base station connected to said private branch exchange, wherein said private PHS base station comprises:
- first transmit/receive means for intermittently transmitting and receiving a first control signal having a first frequency in a predetermined cycle and at a predetermined interval; and
second transmit/receive means for intermittently transmitting and receiving a second control signal having a second frequency different from said first frequency in said predetermined cycle and at said predetermined interval when said first control signal is neither transmitted nor received.
2 Assignments
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Accused Products
Abstract
In a personal handy phone system, a private PHS base station is communicable with both a private PHS terminal and a public PHS terminal. The private PHS base station intermittently transmits and receives a first control signal having a first frequency in a predetermined cycle and at a predetermined interval to communicate with the private PHS terminal. The private PHS base station intermittently transmits and receives a second control signal having a second frequency different from the first frequency in the predetermined cycle and at the predetermined interval to communicate with the public PHS terminal when the first control signal is neither transmitted nor received.
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Citations
4 Claims
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1. A personal handy phone system comprising a private branch exchange network including a private branch exchange connected to a public PHS network and a private PHS base station connected to said private branch exchange, wherein said private PHS base station comprises:
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first transmit/receive means for intermittently transmitting and receiving a first control signal having a first frequency in a predetermined cycle and at a predetermined interval; and second transmit/receive means for intermittently transmitting and receiving a second control signal having a second frequency different from said first frequency in said predetermined cycle and at said predetermined interval when said first control signal is neither transmitted nor received. - View Dependent Claims (2)
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- 3. A method of controlling a personal handy phone system comprising a private branch exchange network including a private branch exchange connected to a public PHS network and a private PHS base station connected to said private branch exchange, said method comprising the step of making said private PHS base station intermittently transmit and receive a first control signal having a first frequency in a predetermined cycle and at a predetermined interval, and the step of making said private PHS base station intermittently transmit and receive a second control signal having a second frequency different from said first frequency in said predetermined cycle and at said predetermined interval when said first control signal is neither transmitted nor received.
Specification