Process for managing a number of mobile stations registered in a

Details Process for managing a number of mobile stations registered in a Process for managing a number of mobile stations registered in a

1997-11-03

1999-12-07

Bost, Dwayne D.

Telecommunications

Radiotelephone system

Security or fraud prevention

455426, 455462, 455411, H04Q 720

Patent

active

059998059

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a process for managing a number of mobile stations registered in a base station of a cordless communication system, in which the mobile stations are registered in the base station on the basis of booking and registered procedures being executed between the base station and the mobile stations and including a mutual exchanging and storing of identification words.
2. Description of the Related Art
The technical development of communication systems for the cordless transmission of voice and non-voice information is tied to various standards, analogously to the ISDN standard (Integrated Services Digital Network) which has existed for some time in line-connected communications. Apart from some national standards and several cross-boundary standards such as the CT1, CT1+ standard on an analog basis and the CT2, CT3 standard on a digital basis, a standard, the so-called DECT standard (Digital European Cordless Telecommunication; compare Nachrichtentechnik Elektronik, Berlin, Vol. 42, No. 1, 1-2/1992, pages 23 to 29, U.Pilger: "Struktur des DECT-Standards" [Structure of the DECT standard]), analogous to the global GSM standard (Groupe Speciale Mobile or global systems for mobile communication; compare Informatik Spektrum, Springer Verlag Berlin, Vol. 14, No. 3, 1991, pages 137 to 152, A. Mann: "Der GSM-Standard--Grundlage fur digitale europaische Mobilfunknetze" [The GSM standard--Basis for digital European mobile radio networks]) for mobile radio, has been created on a European scale for the lower-power cordless communication between portables and a base station, with ranges of some 100 meters. It is an essential feature of the DECT standard that the base station can be connected to line-connected communication networks (e.g. PSTN=Public Switched Telephone Network; PTN=Private Telecommunication Network).
For the cordless communication according to DECT standard, a dynamic channel selection of approximately 120 available channels is carried out.
The 120 channels result from the fact that in the DECT standard, ten frequency bands between 1.8 and 1.9 GHz are used, a time-division multiplex frame of 10 ms being used in time-division multiplex access (TDMA) in each frequency band according to the representation in FIG. 1. In this time-division multiplex frame, 24 time channels (from 0 to 23) are defined which provides a frame structure. This frame structure is then used in such a manner that for each frequency band, 12 stations of a DECT system can operate simultaneously in duplex mode. A time slot of in each case 417 .mu.s is allocated to the 24 time channels. This time slot specifies the time in which information (data) are transmitted. This type of transmitting information in duplex mode is also called the ping-pong process because transmission takes place at a particular time and reception takes place at another time. In this ping-pong process, one time frame or pulse (burst) of 365 .mu.s is transmitted in each time slot, which approximately corresponds to a frame length of 420 bits. The succession in time of the transmitted pulses defines a channel, the so-called physical channel, with a data throughput of 42 kbit/s for the time slot, 6 kbit/s for a guard space used in order to avoid overlaps by adjoining time slots, and 1.152 Mbit/s for the time-division multiplex frame. In the DECT standard, the time frame shown in FIG. 2 is allocated to a physical layer (PH-L) and is frequently also called the D field.
In addition, a number of layers are defined in the DECT standard, analogously to the ISDN standard with the ISO/OSI 7-layer model. One of these layers is the physical layer (PH-L). Another layer is a medium access control layer (MAC-L) which is allocated an A field and a B field according to FIG. 3. The A field comprises 64 bits which, inter alia, are used for messages when combining the portables and base station of the DECT communication system.
The B field comprises 324 bits, 320 bits of which are used for voice data and 4 bits fo

REFERENCES:
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patent: 5335262 (1994-08-01), Oguchi et al.
patent: 5335278 (1994-08-01), Matchett et al.
patent: 5438608 (1995-08-01), Kojima
patent: 5517554 (1996-05-01), Mitchell et al.
patent: 5629975 (1997-05-01), Tiedemann, Jr. et al.

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