Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-07-03
1998-06-30
Kizou, Hassan
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370524, 455450, 455517, H04Q 724, H04Q 730, H04Q 1104
Patent
active
057744602
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a local ISDN transmission system which is organized as a local radio cell, consisting of a central fixed radio station and a plurality of subscriber radio terminals and is connected to the subscriber ports (ISDN base connections) of a local switching center, store-and-forward center or private branch exchange, and provides subscribers with access to the public ISDN telephone system through an N.sub.0 interface by the use of wireless transmission, and in which, for the operation of the system in the case of a number of subscribers greater than the number of the duplex radio channels (hereinafter called communication channels) in use, a radio communication system is present in a central fixed radio station (base station BS) which, in the event of an activation request (PH-ACTIVATE REQUEST), opens to the subscriber radio terminal (TL), by means of a special radio communication process, any one of the available and free communication channels for communication.
STATE OF THE ART
The invention relates to a local ISDN radio transmission system. It is organized as a local radio cell which consists of a central fixed radio station (BS base station) and a plurality of outside subscriber radio terminals. The object is to use wireless transmission in order to provide access to the public ISDN telephone network through an S.sub.0 interface for subscribers who for a great variety of reasons cannot be connected to a communications system via standardized subscriber lines.
Multi-user systems for radio-supported connection of telephone subscribers to the public telephone network are in wide use. They come under mainly the following categories:
These are characterized mainly by roaming and handover (overload) facilities with all of the resultant consequences for the network control and the demand for the ability to use mobile equipment at high road speeds of up to 200 kn/h and the resultant demands placed on the radio transmission process.
These have roaming and handover like the mobile radio networks, but as regards subscriber spectrum, territorial extent, functionality and especially access to the public networks they are subject to the limitations referred to above.
These networks are intended to break the connection of the cordless telephone to a specific main line and to extend the territorial range of use to the range of a PABX by inserting a handover.
These are characterized by wireless connection of stationary subscribers in the case of a connection of the radio transmission system that is equal for all subscribers. This means that in the telecommunication system each radio subscriber has a subscriber line of its own, and the radio transmitter is inserted between these subscriber connections and the radio subscriber.
These are characterized by the fact that, from a central node exchange or secondary exchange, they make a point-to-multipoint connection in territorially very remote areas, and radio connections are used. Channel groups are transmitted which can be split up into several planes en route and are sent to several end points. From these end points the subscribers are connected usually via cable, and if radio is used, equal-channel connection is usually performed. In the rural networks no switching functions are performed.
These systems offer the subscriber in general an a/b connection or adequate functions as regards speech communication and modem and fax transmission. To some extent, special connections are offered for data transmission (data terminals). The data rates can amount to up to 64 kbit/s. These systems are designed for connection to the ISDN and sometimes they provide a few select functions of the ISDN to the subscriber. The preparation of an unlimited S.sub.0 interface, however, is not one of the performance features of this system.
So a process is described in PCT/EP91/00853 (International Publication Number W091/18483) for offering GSM subscribers access to performance features of the ISDN. The process presented, however, is limited by the fact that
REFERENCES:
patent: 5325419 (1994-06-01), Connolly et al.
patent: 5363371 (1994-11-01), Roy et al.
patent: 5519702 (1996-05-01), Takahashi
patent: 5542094 (1996-07-01), Owada et al.
patent: 5608780 (1997-03-01), Greszberg et al.
Jackel Klaus
Schiffel Reinhard
Stadler Bruno
Vogel Holger
Kizou Hassan
Krone Aktiengesellschaft
LandOfFree
Local ISDN radio transmission system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Local ISDN radio transmission system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local ISDN radio transmission system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1867727