A PHS-FWA system for commercial/trial purposes was successfully introduced in the Canadia Industrial Park located in the suburbs of Phnom Penh. The system has been fully operational and has gained customer satisfaction since the systems introduction.
The population of Cambodia is about 12 million. The teledensity is, however, low in comparison with other Asian countries. Thus, telecommunications construction projects are of the highest priority in this country.
The Cambodian government, in order to attract foreign businesses, decided to introduce in the industrial park constructed in suburban Phnom Penh an effective, low-cost telecommunications system which can be implemented in a short period. Thus, construction of the telecommunications system employing the PHS-FWA system was started in July 1998; this system inaugurated services in March 1999.

[Outline of PHS-FWA system]

At the initial stage, the PHS-FWA system accommodates 300 circuits. As regards maximum capacity, with the expansion in the number of cell stations (CSs), the system can be expanded to 1,000 circuits. Fig. 1 shows the geographical configuration of the industrial park, while Fig. 2 provides the access circuit configuration of the PHS-FWA system.

Fig. 1 Location of Canadia Industrial Park

An ordinary access circuit configuration connects radio control stations with cell stations via direct radio circuits (point-to-multipoint: P-MP). As shown in Fig. 2, this PHS-FWA system 1) inserts repeaters, 2) concentrates three CSs into one point.

Fig. 2 Configuration of access network of PHS-FWA system

There are two reasons why this irregular configuration is adopted:
1) Because radio propagation research shows that radio noise generated by many motor cycles is strong, heightening the C/N ratio between radio control stations and CSs became necessary. Then, large-power repeater units (RUs) were inserted in order to ensure the necessary C/N ratio. RUs and CSs are connected via cables.
2) Concentrating three CSs at one point is required in that the industrial park area is small enough to be covered by one CS. There is no need to install CSs in different locations.