INDEPENDENT COMMUNICATIONS AUTHORITY OF SOUTH AFRICA ("ICASA")
FURTHER INPUT TO THE INTERCEPTION AND MONITORING BILL ("The Bill")
26 August 2002
Again, ICASA wishes to thank the Committee for this opportunity to make a further input to the Interception and Monitoring Bill. We, in addition want to apologise for any inconvenience we might have caused in the process.
We further wish to reiterate our commitment to any request for assistance to fight crime in this country. Lastly, we fully support the provisions of this Bill and the intentions of Government but just have to be clear that this process does not have the unintended consequence of stifling the growth of the telecommunications sector, thereby hampering economic growth in our country.
Radio Frequency Spectrum Monitoring is the physical process of determining what signals are present in the electromagnetic spectrum, and what characteristics of those signals are. Radio Frequency Spectrum monitoring is most frequently concerned with the external characteristics, and not the internal characteristics of the signal, i.e., not the physical makeup of a signal but rather its effect.
Radio communications as a component of a telecommunications system resulted in an immediate need to regulate the use of the radio frequency spectrum, which constitutes a natural resource at the service of humankind. The development of the radio techniques used in telecommunications has permitted an expanded use of the radio frequency spectrum. On the other hand, human communication requirements have increased to such an extent that frequency spectrum utilization more that ever before, calls for extremely rigorous management.
Good spectrum management can only satisfactorily proceed if the planners are adequately informed on the current usage of the spectrum and the changing trends in demand. Whilst much data is collected from prospective users on licence application or renewal forms, it is seldom adequate for spectrum management purposes. These records will only indicate that the use of a frequency is authorised but may not give adequate information on whether the frequency is actually used. Therefore, a frequency band that appears crowded based on frequency assignment records may or may not in fact be crowded.
A key need in developing future policy is to know the level of utilization of the various assignment bands. The demand for Wireless communications by service providers and State agencies will continue to increase with concentrations in the major cities. Planning to make more radio frequency spectrum available for example migrating fixed services to higher frequencies, is a long-term process. Adequate warning of the need will avoid inabilities to issue new assignments or the quality of service deteriorating below acceptable levels.
The level of use by each licensee varies according to the specific applications and the time of day. Licensing data can be used to predict the levels of use with some degree of success depending on the sophistication of the prediction model and the accuracy of the data. As congestion increases, the model will become progressively less from the area of the proposed assignment will be invaluable in identifying a frequency most suited to the prospective licensees’ purpose which will in all probability involve sharing with existing users.
Monitoring data is expensive to collect and despite it being a most valuable tool, it is impractical to utilize it for all assignments. Modelling based on licensing data quite adequately serve areas of the country where there is little use of the radio spectrum. Monitoring data collected in the busier areas can be compared to the levels predicted by analytical methods and the results used to identify suspect licensing data and refine the method so that it best fits the total picture. This means that applicability of the method can be enhanced and the monitoring better targeted to those areas most in need of assistance.
As congestion grows, the users will become less satisfied with the service available. By being able, to monitor in areas attracting disproportionately large numbers of complaints, the true nature of the problem can be ascertained and the best remedial action devised. It will also be possible to substantiate or refute the complainants allegation regarding the quality of services perceives.
The radio frequency bands are not immune to the effects of anomalous propagation. High atmospheric pressure areas over the waters separating two countries give rise to ducting. Areas of unusually high ionization in the ionosphere are also prone to causing anomalous propagation effects. The result is interference from distant services normally considered too distant to warrant great efforts in the co-ordination.
The effects are usually short lived and whilst statistical data on them is available, it is only by monitoring that the implications on particular services can be judged. It may well be that only a few distant transmitters affect few services. The appropriate cure will be case specific and good monitoring data will greatly aid identifying the causes of the problem.
The demand on the spectrum is now such that services are expected to share. Some service types are clearly incompatible but often the matter is borderline and trails will have to be mounted to determine the true degree of compatibility. Monitoring the conduct of the trail will give information such as relative signal levels to aid analysis of the system users perceptions.