Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-11-07
2000-08-29
Vo, Nguyen
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455426, 455 111, H04Q 720
Patent
active
06112091&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates generally to telecommunication systems comprising a radio link connection between two or more telecommunication units and, more specifically, to telecommunication systems having a plurality of geographically spread fixed and/or mobile radio telecommunication units. The invention provides a method of estimating system requirements of such telecommunication systems, in particular of so-called Radio in the Local Loop (RLL) or Wireless in the Local Loop (WLL) telecommunication networks.
BACKGROUND OF THE INVENTION
In conventional Public Switch Telephone Networks (PSTN) and Integrated Services Digital Networks (ISDN), for example, up till now the overwhelming majority of residential and office subscribers have a wired connection from the subscriber premises to a public local exchange. These subscriber connections, which may run via an intermediate concentrator, are referred to as the local loop.
The installation of such wired links all the way down to the subscriber premises is both time consuming and involves substantial networking costs, apart from troubles caused by the interruption of streets and pavements. Therefore, there is a growing interest in replacing the wired local loop by a so-called wireless local loop, i.e. using radio technology as an alternative for or as a replacement of the copper wires down to the subscriber premises. This is not only of interest for the present network operators in case of expansion or renovation of the existing public telecommunication network but, in particular, for new operators which would like to provide competitive public telecommunication services, such as a public telephone service. The concept of wireless public subscriber connections is called RLL or WLL.
Within the concept of RLL, two basic systems can be distinguished: Fixed RLL (FRLL) and Mobile RLL (MRLL). In the FRLL system, the subscriber is provided with an ordinary telephone socket, however connected to a radio transceiver, also called Fixed Access Unit (FAU) or Wireless Fixed Access Unit (WFAU). Via this FAU/WFAU a radio link is established with a so-called base station or radio access unit, which provides access to the PSTN/ISDN. In the MRLL concept, the subscriber is provided with a portable cordless or mobile radio telephone handset, by which, via the radio access unit access to the PSTN/ISDN can be established.
Mixed concepts are also possible, i.e. FRLL providing mobility in the subscriber premises, also called Cordless In The Home (CITH) and residential or neighborhood mobility, also called Cordless In The Neighborhood (CITN). In some countries, governmental regulations prevent the established telephone operators from offering local mobility in the present PSTN/ISDN. In such cases, it is very attractive for a second or third operator to offer both fixed and mobile or cordless access to the PSTN/ISDN.
The advantages of wireless local loop connections in the PSTN/ISDN network are numerous, ranging from short installation times, increased flexibility and improved operation and maintenance of the network to the opportunity of providing local subscriber mobility to the PSTN/ISDN.
International Patent Application WO 94/19877 discloses an RLL system based on existing business cordless technology, such as designated CT2, CT3 and Digital Enhanced Cordless Telecommunications (DECT). These cordless communication systems have been developed for use in picocells (having a range from the radio access unit to the cell boundary of a few meters), nanocells (up to 10 m) and microcells (10 to 400 m for pedestrians and 300 m to 2 km for vehicles).
The non-prepublished International Patent Application PCT/EP95/04509 discloses an RLL system comprising a number of geographically spread radio access units or radio access units based on the above cordless communication techniques, in particular DECT, providing coverage in sectors for use in minicells (500 m to 3 km) and macrocells (up to 5 km).
Other types of communication systems having wired connections to a PSTN/I
REFERENCES:
patent: 5265150 (1993-11-01), Helmkamp et al.
patent: 5544227 (1996-08-01), Blust et al.
patent: 5911123 (1999-06-01), Shaffer et al.
Blomstergren Sten Erik
Brouwer Frank Bastiaan
Van Houwelingen Jan Arie
Van Puuenbroek Cornelis Adrianus Henricus Maria
Armstrong Darnell R.
Telefonaktiebolaget LM Ericsson
Vo Nguyen
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