Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-02-12
1999-09-07
Chin, Wellington
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455426, 455445, 455444, H04Q 720, H04Q 736
Patent
active
059501359
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the operation, monitoring and control of a communications system. In particular it relates to operation of telecommunications networks, but is not limited to such systems.
In this specification the term `functional element` is used to define an element of a communications system which performs some function, e.g. a switching or monitoring function, to the system itself, as distinct from an `application process element` which controls a number of "Functional elements" to achieve a high level function, usually requiring concerted action from several functional elements. This high-level function may be a network application such as a handover process in a mobile radio system.
In a telecommunications network the functional elements of the system are widely distributed. For example, switching functionality is required at nodes throughout the system. However, in conventional telecommunications networks application process control is concentrated, requiring a large signalling load to be carried over the telecommunications network. Despite the distributed nature of the system all elements of the network which interact must have compatible signalling formats. This is a particular problem in a cellular radio network, where mobile units made by a number of different manufacturers can turn up anywhere in the system and have to interact consistently with whichever fixed part of the network they happen to have established communication with. In such a network it is difficult to arrange for enhancement or improvements, because of the need for all signalling formats to remain compatible.
Further problems arise in known systems because of the need for measurements of network conditions e.g. link performance to be made, and the results transmitted to a control centre, either continuously or discontinuously depending on the nature of the measurements to be made and the purpose for which they are required. This places an additional signally overhead on the network. Many measurements are often only require in specific operating circumstances. It is therefore wasteful of signalling capacity for all possible data to be transmitted when much of it is redundant. The limited signalling capacity and the number of different measurements to be made also reduce the resolution of the measurements and/or the sampling rate that can be supported.
A further limitation on capacity in conventional systems is caused by limited routing capabilities. Particularly in a case where a call requiring very high bandwidth or data rate is required, there may be no single route available through the network allowing such capacity. This may be the case even if it is possible to re-route calls in progress without interruption in order to provide greater capacity on a particular link. In these circumstances, a call requiring a higher bandwidth would either fail or cause another lower priority call already in progress to fail, although the system as a whole does have sufficient capacity.
Existing telecommunication systems normally permit single links from point to point only. If the link is unreliable, error checking processes may be employed but these require additional data in order to perform the error checking. It is known for mobile units to monitor more than one base station simultaneously, in order to identify the one with the best quality signal. However, in a conventional switched network, because the switching and control of the call are indivisible, the call is handled over a single route only.
It is also known for a transmission to be shared between a number of routings such that different parts of the information are transmitted over different routes. For example alternate timeslots of a time division transmission could be sent by different routes. This allows a transmission to be made even though no one routing has sufficient capacity for the transmission. However, the transmission quality will only be as good as the worst of the various routings selected, and a failure of any one route would cause the failure of the t
REFERENCES:
patent: 4383316 (1983-05-01), Seidel
patent: 5007052 (1991-04-01), Flammer
patent: 5058201 (1991-10-01), Ishii et al.
patent: 5103444 (1992-04-01), Leung et al.
British Telecommunications public limited company
Chin Wellington
Ferguson Keith
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