Compatibility between radiocommunication & ISM systems in the 2.4 GHz frequency band

Abstract

Investigations have been made into the co-existence of a variety of radiocommunication and ISM systems in the 2400 - 2483.5 MHz frequency band, to determine whether the band will be capable of supporting a reasonable quality of service for both public radio fixed access (RFA) services and all the private, unlicensed telecommunication systems which are likely to be deployed in the band. The investigations included statistical modelling of various interference scenarios and market penetration levels.

The report identifies a number of technological issues relating to system co-existence in this frequency band and concludes that:

There is already a significant amount of RF activity and there is likely to be a substantial increase in the future as increasing numbers of communication devices are deployed in the band.

Types and levels of interference vary considerably both geographically and over time Currently, the highest peak levels of interference at most locations are likely to be from ISM equipment and OBTV transmissions. However, as penetration levels increase, outdoor communication systems (RLANs and wireless bridges) are expected to become the most significant sources of interference.

The effect of increasing levels of interference is likely to be a reduction in the maximum working range of radiocommunication systems in the band.

Operation of high performance telecommunication networks in a very dense urban environment such as the City of London "square mile", which is also subject to a relatively high number of OBTV transmission, is unlikely to be viable. Operation of a single such network in other more typical urban areas should be viable in most instances, providing due account is taken of the projected future increase in interference levels.

 

The full report is available in Word (650 KB) or as a zipped Word file (269 KB)

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