DE29900867U1 - Telephone set - Google Patents

Description

Testing technology Dieter Busch AG
D 85737 Ismaning
!.February 199/S

Telephone set for wireless telephone connection

The invention relates to a telephone for wireless telephone connections. Devices of this type have been known for some time and were first used in the military. In the meantime, the size of such devices has been reduced considerably. At the same time, the range of functions of such devices has been considerably expanded. As is generally known, with current so-called cell phones, mobile telephone calls are possible, at least in urban areas, without having to accept any restrictions on the number of subscribers that can be reached.

In a similar way, it was possible to improve the comfort of telephones, particularly in the home and private sector, by using so-called cordless telephones instead of wired telephone terminals. These were characterized by the fact that a conventional telephone terminal was extended with a transmitting and receiving device. In conjunction with such a telephone terminal, a portable terminal can also be used in a known manner, which, among other things, has all the conventional telephone functions and is operated with a few accumulators or batteries. These aforementioned devices are also of considerable practical use and are very popular.

However, there is the disadvantage that users of such devices, when using both systems intensively, are faced with the problem of having both a so-called cordless telephone for operation in a local area and a so-called mobile phone for operation in a national or international network, possibly also for direct

Connection to a satellite-based telephone network, which is not only inconvenient, but also disadvantageous because the capacity of the batteries or accumulators of two different systems must be continuously checked and care must be taken to ensure that such batteries or accumulators are correctly recharged.

This problem is solved in that, according to the invention, one and the same telephone can be operated either as a so-called cordless telephone, in particular within the effective range of a home telephone system, or as a so-called mobile telephone, in particular a so-called "cell phone" within the effective range of a cellular wireless telephone network. - Furthermore, to solve the problem mentioned, the invention additionally provides that a reconfiguration of the operating modes is carried out automatically, both in the "calling telephone" mode and in the "called telephone" mode. - In particular, a telephone according to the invention is advantageously equipped in such a way that the device (telephone) is operated in the so-called D-Net and/or in the so-called e-Net as a transmitter and/or receiver. The invention proves its usefulness in particular when it is operated in conjunction with an associated local switching device (home telephone system), in the effective range of which several cordless telephones can be addressed and operated. This is based on the fact that the range of such a switching device for wireless transmission of telephone calls is limited to a few hundred meters. If an owner of a telephone device (telephone) according to the invention leaves this range, he can still be easily called via an associated national or international network. The invention is therefore particularly effective if a telephone connection can be made selectively or alternately with the direct involvement of a satellite-based telephone network, or is used in the predominant mode of use with the involvement of a switching system with UHF transmission paths.

The invention is explained below with reference to Fig. 1. A battery-operated telephone 1 according to the invention has a transmitter and a receiver for receiving wireless telephone signals, together with the associated antenna 2. Furthermore, a keypad is provided, in particular a key can be provided with which it can be manually specified whether the telephone is to be used as a so-called cordless telephone.

or as a so-called mobile phone. Normally, however, such a button is unnecessary, since a corresponding switchover can be made by entering a corresponding area code, e.g. a number zero. The telephone 1 is on the one hand able to set up (alternatively or simultaneously) a wireless connection either to a local exchange station 3, so that a house connection or a national or international telephone connection can be reached from there. Accordingly, the local exchange station 3 can in turn set up a wireless connection to the telephone 1, in a manner known per se.

The telephone 1 is, on the other hand, able to establish a wireless connection to one of several cellular switching stations 51, 52, 53, 54, etc. (alternatively in transmission mode, or simultaneously in reception mode) or to be called by one of them. If the telephone 1 is called, a user does not need to worry about switching between the alternatives of cordless telephone and mobile telephone, since the cordless telephone/telephone automatically makes the corresponding switch.

Claims (1)

Reference number: 299 OO 867.3 Internal reference: P 323-DEGM-I Date: 01 June 1999 Protection claims : Telephone set for wireless telephone connection - a high-frequency transmitting device, - a high-frequency receiving device, - one with the transmitting and/or receiving device in operative connection antenna - a keypad - a switching device or reconfiguration device for switching or reconfiguring the telephone set into one of the following permanently available operating modes: - Cordless telephone within the effective range of a home telephone system - Mobile phone within the effective range of a cellular structured wireless terrestrial telephone network - Mobile phone within the range of a satellite-based telephone network Telephone apparatus according to claim 1, with an automatic reconfiguration device, or with a manual reconfiguration device operated by means of a button. Telephone apparatus according to one of the preceding claims, with a dial-in device for an optional dial-in process into the so-called D-Net or into the so-called e-Net.