DE19919513A1 - Mobile phone with additional transmit and receive device for terrestrial communication via direct radio connection - Google Patents

Abstract

Radiophones (1,2) are connected by radio paths (3,4) to base stations (5,6) of mobile phone network. This is integrated in wire connected network or connected with wire connected telephone network via gateway (8) as stand alone connection network (7). Direct radio connection is made for radio connection between the telephones or for connection with radio equipment (10) set up for additional frequency band, as no special transfer protocol is used.

Description

The invention relates to a mobile radio telephone for known radio networks, which is equipped with additional components to direct when available Possibility of communication without the infrastructure of a cellular network operator to communicate inexpensively.

Conventional cellular phones are on the base stations and the switch technology of the mobile network operator. Of course you can Facilities cannot be provided at no cost. The Call charges are falling on average, but they can There is a desire to communicate them entirely at no cost.

The invention is therefore a technical problem to provide a Radiotelephones based, with which also a free communication possibility is created.

The problem is solved in that the facilities for Communication in the mobile network is still a transmitting and receiving device for terrestrial communication via a direct radio connection in one suitable frequency band is integrated into it.

So with a correspondingly equipped second radio telephone or a radio for this frequency band without a telephone function Radio connection can be established.

Suitable areas for this are in the 2 m band in the area of former frequencies for the radio telephone network B. Here are three frequencies  released for general operation. In the 70 cm band are around 433.920 MHz also has multiple channels for general use small transmission power available. This area is ideal for an inventive use in a radio telephone for known Radio networks, which is equipped with additional components, since the Antenna efficiency at a radio wavelength of 70 cm at a smaller one Construction is better than in the 2 m frequency range.

For reasons of cost and space, the functions of Mobile phone and additional transmitting and receiving device as far as possible same components used. This initially applies to the keyboard, microphone, Speakers, CPU and peripheral components and, if applicable, the Antenna too. Sharing the other electronic Components depend on their internal structure and the possibility of one cost-effective manufacturing process.

The single figure shows two radio telephones 1 and 2 according to the invention, which are connected via radio links 3 and 4 to base stations 5 and 6 of a mobile radio network. This may be integrated in a wired telephone network or may be connected as an independent connection network 7 via a network interface 8 to a wired telephone network.

With the immediate possibility of a radio connection between radio telephones 1 and 2 , a direct radio connection 9 can be expanded. Of course, a connection to any radio device 10 which is designed for the corresponding additional frequency band is also possible since no special transmission protocols are used.

Claims (3)

1. Radio telephone for existing mobile radio networks, characterized in that a transmitter and receiver device for terrestrial communication via a direct radio link is also integrated into the devices for communication in the mobile radio network. 2. Radio telephone according to claim 1, characterized in that for the additional transmitting and receiving device and the functions common components of the radio telephone are used. 3. Radio telephone according to claim 1 or 2, characterized in that the antenna by suitable high-frequency adaptation measures is used for all frequency ranges used.