Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
1998-04-29
2001-08-21
Vincent, David R. (Department: 2661)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S359000
Reexamination Certificate
active
06278700
ABSTRACT:
BACKGROUND
The present invention relates to an arrangement for providing access between user equipment (such as for example cordless telephones) which are connected to base stations via radio and a switching arrangement of a telecommunications network wherein at least one access network is provided which interfaces the switching arrangement(s) via at least one interface.
The invention further relates to a telecommunications system comprising a telecommunications network and a number of user stations connected via radio to a number of base stations, said telecommunications network comprising a number of switching arrangements, the system further comprising at least one access network connecting to the switching arrangements over at least one interface.
Still further the invention relates to a method for providing access between a number of user stations connected via radio to a number of base stations and a local exchange of a telecommunications network with a number of switching arrangements wherein access is provided via an access network connecting to the switching arrangements of the telecommunications network.
It is becoming more and more interesting to use radio in telecommunication networks. Services of interest are for example Cordless Terminal Mobility (CTM) and Radio in the Local Loop (RLL). The network architecture of existing public switched communication networks is not such as to enable handling of users connected via radio, for example via the DECT air interface (Digital European Cordless Telephone System) to the local exchanges of the public switched systems, among others since these users are movable within the network. Today there is no standardized interface for interfacing CTM services to the local exchanges. This means that there is no interface handling the mobility of these subscribers in the network for the necessary transmission between local exchanges and the subscriber. The V5.1 interface standardized by ETSI, European Telecommunications Standard Institute, ETS 300 324-1, interconnects an Access Network (AN) with a Local Exchange (LE) of a Public Switched Telecommunications Network and it comprises a 2048 kbit/s data link for multiplexing of up to 30 PSTN or 15 ISDN-BA (Basic Access) accesses. This interface can however not take care of the mobility of the subscribers as referred to above. For traditional users there is a fixed relation between the directory number (DN) and the equipment to the User Network Interface (UNI). For the handling of movable users which can be anywhere in the network, the connection of the user and used base stations (when referring to the DECT system, these are known as Radio Fixed Parts RFP), is not sufficiently flexible and moreover the traffic concentration of the interface can not be handled.
U.S. Pat. No. 5,040,177 describes an access network for a cordless telephone service. This access network comprises a distribution network with base stations connected by cable to the public switched network and digital cordless telephones. Each telephone is connected by radio to the same base station throughout the duration of a call. Moreover the access network comprises a service control point network with network service control points connected to the public switched network. Each point comprises a data base of cordless telephone service subscribers for processing a number of functions in real time. The service control point network moreover comprises a managing service control point controlling the databases. The service control point network has the architecture of an intelligent network. Each base station is connected to the public switched network via a 2B+D or a 30B+D type channel. The public network is an integrated services network. A conversion is effected to and from ISDN protocol.
However, none of the known systems works as satisfactorily or is as simple as desired e.g. relating to fulfilment of requirements for example as to traffic concentration, ability of handling handovers without generating any necessary signalling to the switching arrangement (such as a local exchange) of the public switched communications network etc.
SUMMARY
What is needed is therefore an arrangement for providing interface between a telecommunications network and a number of user stations connected by radio which is capable of handling a large number of users, particularly over merely a few interfaces and wherein the transmission within the network is kept low. Moreover an arrangement is needed through which internal handovers can be handled in an access network (AN) without generating unnecessary signalling within the switching means of the telecommunications network, particularly the local exchanges, and through which the use of data and data storing within the switching means or local exchange(s) can be minimized.
Moreover an arrangement is needed which provides an efficient usage of the radio unique equipment of the radio network.
What is needed is an arrangement which enables integration of the base stations (or in a particular embodiment Radio Fixed Parts (RFP)) in the switching arrangements of the telecommunications network, particularly in the local exchanges. A particular embodiment relates to providing an arrangement through which DECT based services can be integrated into a telecommunications network, e.g. a public switched communications network, particularly the local exchange(s) thereof. Moreover a particular embodiment relates to providing an arrangement through which DECT based services can be integrated into a telecommunications network, particularly the Public Switched Telecommunications Network (PSTN) or the Integrated Services Digital Network (ISDN).
Still further an arrangement is needed through which CTM services can be provided, particularly in such a way that operation and maintenance can be provided in an easy and appropriate way. Eventually might fixed radio, radio in the Local Loop (RLL) services be offered.
What is needed is also a telecommunications system comprising a fixed telecommunications network with a number of switching means such as for example local exchanges and a network with at least a number of user stations connected via radio to a number of base stations wherein said user stations connected via radio can access the fixed telecommunications network.
Furthermore a method is needed for connecting a movable subscriber connected via radio to a telecommunications network or similar.
Thus an arrangement is provided in which an existing interface is so structured that the radio connected user stations can be connected to the telecommunications network.
Particularly the interface is a V5.1 interface of which an address field is so structured that it comprises a first and a second part wherein the first part is used for addressing base stations and the second part is used for addressing or identifying selected bearer channel on the interface.
An Access Network (AN) is implemented between e.g. a local exchange and the user station which is comprised by a Radio Access Network (RAN) comprising radio unique functionalities. A number of user ports are implemented in the RAN and via the address field comprising a first and a second part the correct base station can be directly pointed out in the RAN and via the second part the selected bearer channel or time slot can be selected by the RAN for interconnecting the subscriber with a switching arrangement, for example a local exchange, of the fixed telecommunications network.
Via the first part of the address field each base station of the RAN can be identified. Particularly the switching arrangements of the telecommunications network comprise a number of local exchanges, the channels to the local exchanges being for example 64 kbit/s bearer channels. Each base station handles a number of bearer channels, for example 12. These figures are however only given for exemplifying reasons and are not intended to limit the invention thereto.
In a particular embodiment the invention relates to the DECT system wherein the RAN is denoted a DECT Radio Access Network
Burns Doane Swecker & Mathis L.L.P.
Telefonaktiebolaget LM Ericsson (publ)
Vincent David R.
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