Telecommunications – Radiotelephone system – Including private cordless extension system
Reexamination Certificate
1998-08-28
2001-03-27
Tsang, Fan (Department: 2746)
Telecommunications
Radiotelephone system
Including private cordless extension system
C455S465000, C455S525000, C455S528000
Reexamination Certificate
active
06208868
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cordless telephone system, and in particular, to a communication method in a cordless telephone system.
2. Description of the Related Art
A cordless telephone system is typically composed of a base unit which is connected to a central office line and a portable unit for communicating with the base unit or with a different wired/cordless telephone while a user roams within a predetermined area. Though one portable unit is generally registered with a base unit, the number of registered portable units per base unit can be increased. That is, in addition to a portable unit provided with the base unit, another portable unit can be purchased and registered with the base unit. In this manner, two or more portable units are registered with a single base unit. Use of a portable unit registered with a base unit allows a user to conveniently communicate without moving to the location of the base unit.
Many homes and offices currently use two or more telephones by connecting the telephones in parallel to a single telephone line or by connecting the phones to different telephone lines. In the first case, the telephones are assigned an identical phone number so that only a single call can be performed by a subscriber at a given time. In the latter case, each telephone line is assigned its own phone number, and each line can support a call.
In using a cordless telephone system in the above cases, one or more portable units are registered with a base unit and a call with a portable unit is performed via the base unit. Therefore, when two or more portable units are registered to a base unit, a first user cannot make a call with a portable unit when the base unit is engaged in a call from a second user with another portable unit. This results in inconvenience to the user who must wait to initiate a call or perform the call on another telephone system.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a communication method in a cordless telephone system having a base unit and at least two portable units registered with the base unit, which allows a communication even when the base unit is busy.
To achieve the above object, there is provided a communication method in a cordless telephone system having a base unit with which a plurality of portable units can be registered, and a portable unit registrable with a plurality of base units. In the method, if the base unit goes off-hook thereby requesting a call, a busy signal is sent to all the portable units registered with the base unit. When the call is terminated in the base unit, a call termination signal is sent to all the portable units. Upon reception of the busy signal, a portable unit stores data indicating that the base unit is busy in a selection table of a memory. To initiate a call, the portable unit sends a call request signal to a primary base unit listed in the selection table if the primary base unit is not busy, and otherwise, to another idle base unit to which the portable unit is registered. When a call termination signal is received from the busy base unit, the busy state indicating data is deleted in the selection table.
REFERENCES:
patent: 5329575 (1994-07-01), Matsuda
patent: 5475736 (1995-12-01), Ito
patent: 5513248 (1996-04-01), Evans et al.
patent: 5559861 (1996-09-01), Takehisa
Dilworth & Barrese LLP
Samsung Electronics Co., Inc.
Sobutka Philip J.
Tsang Fan
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