Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-06-22
2001-03-06
Le, Thanh Cong (Department: 2684)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S039000, C455S425000, C455S166100, C455S166200, C455S434000
Reexamination Certificate
active
06198926
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a telephony device comprising:
a base station formed by, inter alia:
a radio part for transmitting and receiving information signals over a plurality of channels,
a processing assembly having, inter alia, a read-only memory containing an execution program, and a random-access memory,
at least one handset formed by active and passive elements in the standby period, these elements forming, inter alia:
a radio part for exchanging information signals with said base station over said plurality of channels,
a processing assembly having, inter alia, a read-only memory containing an execution program and a random-access memory,
control means for putting said passive elements in the standby mode during standby periods,
channel scanning means for scanning outside said standby periods said plurality of channels which are activated via a time delay to define idle channels.
The invention relates to a handset and a base station suitable for such a telephony device.
The invention also relates to a method of establishing standby periods in a handset which forms part of such a telephony device.
BACKGROUND OF THE INVENTION
The invention finds interesting applications in telephony devices satisfying the DECT standard. The invention also shows interest in the standards which impose a permanent search for idle channels, so that an idle channel is to be found quickly without this being noticed too much by the user. However, this monitoring of channels implies the use of electronic circuits which consume electric energy and therefore this channel monitoring reduces the autonomy of the handsets which are usually supplied with power by an accumulator. Furthermore, the DECT standards impose that a requested channel search be made in the 30s prior to a request for a channel link.
SUMMARY OF THE INVENTION
The present invention proposes a device of the type described in the opening paragraph which ensures a better management of the analysis of the idle channels and thus provides a better autonomy for the handsets.
Therefore, such a device is characterized in that a time delay controller is provided for varying the time delay as a function of the availability of said channels.
The idea of the invention consists of spacing the channel scanning the moment the traffic is calm or stable.
Another characteristic feature of the invention according to which reduced-scanning means are provided for carrying out a scanning of a reduced number of channels makes it possible to avoid too long a period for the user when a connection is requested. This reduced scanning profits from scannings effected previously.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
REFERENCES:
patent: 5276686 (1994-01-01), Ito
patent: 5627882 (1997-05-01), Chien et al.
patent: 0490441A2 (1992-06-01), None
patent: 0526207A2 (1993-02-01), None
Cong Le Thanh
Halajian Dicran
U.S. Philips Corporation
Zewdu Meless
LandOfFree
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