Radio telephone having removable memory containing all essential

Details Radio telephone having removable memory containing all essential Radio telephone having removable memory containing all essential

1993-10-20

1995-09-05

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

Having particular housing or support of a transceiver

455 89, 4551861, 379 58, 379357, H04B 140, H04Q 732

Patent

active

054487650

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a radio telephone or the like, comprising a radio transceiver, a microprocessor circuitry, a work memory, and a reading device in which a removable memory can be inserted to enable reading under control of the microprocessor circuitry, the removable memory containing the individual data of a radio subscriber and at least the system-specific control parameters of at least one radio telephone system, the microprocessor circuitry configuring a radio telephone to operate in the radio telephone system in question by means of the parameters.


BACKGROUND OF THE INVENTION

So-called private automatic radio telephone networks or trunked networks, where several user groups or even several user organisations share the same radio channels and other resources in a common network are widely used. Typical private radio network applications include energy production and distribution, communal and municipal services, such as transportation, construction and maintenance, and emergency services, such as police, fire alarm, security and ambulance. A private radio network may offer fast access within the user's own organisation, individual or group communication, data communication, etc. The system checks the subscriber authorization and allocates resources. An individual subscriber is unaware that he or she uses the same frequencies as other subscribers since the system automatically allocates a free radio channel for a call during the call set-up. Radio telephone systems of this kind usually have a rather limited geographical coverage, and so the user may easily get outside the service area of his or her own system, whereby he or she cannot use his radio telephone. Therefore, interest has been aroused in the possibility of using the same radio telephone in several different systems.
The specifications MPT 1327 and MPT 1343 issued by the British Department of Trade and Industry have become to be regarded as some kind of de facto standards in Europe for private radio telephone networks. MPT 1327 specifies signalling over the radio path, while MPT 1343 specifies the operation and structure of the radio telephone. Systems complying with these specifications have been and will be introduced in different European countries. Since radio telephones used in different systems actually comply with the same specification MPT 1343, they can, in principle, be transferred from one radio telephone network to another by varying the network-specific radio telephone parameters complying with the MPT 1343. The network parameters that are needed and can be stored in a radio telephone are defined on pages 6-1 to 6-8 of Part 6 of MPT 1343, particularly in Table 6-1.
According to the above Part of the specification, radio sections providing the user with a possibility of switching between the systems selected must have a sufficient parameter storage to meet the requirements of every system. According to the above specification, the majority of the network parameters must be stored in a memory of type A, i.e. read-only memory. The parameters varying during the operation of the radio section must be stored in a memory of type B or C, i.e. secured or unsecured memory, respectively, depending on whether the information may disappear when the radio telephone is turned off.
German Offenlegungsschrift 3,838,677 discloses a radio telephone in which the loss of important data caused by the user is prevented during the operation of the radio telephone by storing the data in a removable memory card, in which are also stored the identification data of the radio subscriber. These important data include, e.g., the last call and the mode of operation of the phone. The subscriber data can be transferred from one radio telephone of a system to another similar phone in the same system by means of a memory card, automatic control of individual subscriber data stored in the memory card preventing the use of the memory in a similar phone in another system.
German Offenlegungsschrift 3,721,360 discloses a radio device in

REFERENCES:
patent: 4887311 (1989-12-01), Garner et al.
patent: 5153906 (1992-10-01), Akiyama
WO-A1,9112698 (22 Aug. 1991) p. 7, Line 28--p. 8, Line 7.

Affiliated with

Also associated with

Rating

Radio telephone having removable memory containing all essential does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Radio telephone having removable memory containing all essential, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio telephone having removable memory containing all essential will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-481431