Telecommunications – Radiotelephone system – Including public cordless extension system
Reexamination Certificate
1996-12-02
2001-06-26
Urban, Edward F. (Department: 2683)
Telecommunications
Radiotelephone system
Including public cordless extension system
C455S415000, C455S566000
Reexamination Certificate
active
06253089
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a system for establishing a telephone connection to a portable telephone in a telephone system, comprising a telephone line connected to a base station, a plurality portable telephones each connectable to telephone line via said base station. The invention furthermore relates to a system for transferring short messages to a portable telephone in a telephone system, from a base station to one among a plurality portable telephones each connectable to said base station.
A DECT system is a telephone system where a number of portable telephones via a base station are connected to the common telephone net. The portable phones are used in an office or at home without necessarily having a person dedicated to each phone. When this is the situation the base station has to call the portable phones successively to find a person who can answer the call. Very often the call has to be passed from the person who answers the call to the person the caller actually wants to call. In some cases the caller is not able to dial the person directly or know how to dial him directly.
There is a need for a telephone system comprising a base station which is able to provide the portable phones with information about the caller so a person who intends to respond the ringing can examine whether he is the right person to respond the call. This information is accessible as an A-number in the digital common telephone systems (ISDN). However the present cordless or DECT systems are due to communication standards not at the moment able to transfer this information to the portable unit during collectively ringing.
SUMMARY OF THE INVENTION
According to the invention the base station in the system for establishing a telephone connection to a portable telephone monitors the telephone line and outputs a trigger signal when a ringing signal is detected at the telephone line. The trigger signal comprises an address which addresses at least a group of the plurality of the phones connectable to the base station whereby the phones receiving said trigger signal starts ringing. Later on the base station output an information signal which comprises the same address as the trigger signal and information about the caller. All the addressed telephones are now provided with said information about the caller. Each of the phones which are ringing comprises means for establishing a communication link from the phone to the base station when the telephone is activated as a response to the ringing.
The portable phones addressed by the trigger signal from the base station will then be in a mode where they more intensively monitor the activity in the data frames send by the base station to pick up said information signal. The trigger signal may preferably be transferred as a short format message used in a DECT system. This type of messages contains according to the present standards three bytes. The information signal may be transferred as a data sequence transferred in sequences of data frames. The information signal may preferably be provided as a CLMS-FIXED message which according to the present standards contains at least five octets of data.
The short format message used in a DECT system contains only three bytes which is not sufficient to transfer ID information about the caller. The CLMS-FIXED message comprises information about the connection to be set and about the kind of connection. The CLMS-FIXED message can be varied in length. However a portable phone will not be able to ensure the reception of the CLMS-FIXED message as long as the phone is in a passive state (low-duty-cycle idle-locked mode). A portable phone can receive a short format message containing an ID for the receiver address which enters the phone into an active mode (idle-locked mode), and when the phone later on receives the CLMS-FIXED message containing the very same ID for the address of the portable phone, said phone will be able to link the two message signals to identify the caller.
The portable telephone may comprise a display for displaying said information about the caller, e.g. the A-number. Preferably the portable telephone may comprise means for interrupt the ringing when another person answers the call.
The invention furthermore relates to a telephone system comprising means for transferring short messages from a base station to at least one among a plurality of portable telephones each connectable to said base station. The base station is controlled to output a short trigger signal including an ID for the address which addresses at least a one of said plurality of telephones whereby said at least one telephone receiving said trigger signal starts intensively monitoring the data frames produced by the base station whereby the portable phone is able to receive the CLMS-FIXED messages. Later on the base station output an information signal in form of CLMS-FIXED messages into the data frames where said information signal comprises the same ID for the address as the trigger signal and the short message to be transferred to said at least one telephone.
Hereby the phone can be loaded with information, e.g. default ID for the address, new services, without disturbing the owner of the phone.
REFERENCES:
patent: 5103448 (1992-04-01), Barnes et al.
patent: 5255308 (1993-10-01), Hashimoto et al.
patent: 5371781 (1994-12-01), Ardon
patent: 5533096 (1996-07-01), Bales
patent: 5646979 (1997-07-01), Knuth
patent: 5703934 (1997-12-01), Zicker et al.
patent: 5734645 (1998-03-01), Raith et al.
European Search Report date Jun. 10, 1999.
Struktur des DECT-Standard, pp. 23-29.
European Telecommunication Standard, Oct. 1992, 237 pages.
Bergmann Lars
Grove Anders
Schlosser Knut Haberland
Nokia Mobile Phones Limited
Perman & Green LLP
Urban Edward F.
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