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With the growth in traditional GSM traffic, but also increasing ‘3G’ content including photographs, video and music, plus email and internet access, capacity demands are increasing exponentially.  

All of these services have combined to increase the bandwidth requirement between Base Transceiver Stations (BTS's) and between BTS’s and Base Station Controllers (BSC's).  Third generation technology is demanding capacity which may are struggling to meet using existing infrastructure, which typically includes leased lines or by RF radio communications.

The costs being incurred by mobile operators are increasing using the existing infrastructure whenever there is an increase in the bandwidth used on leased lines.  For example, the gradual migration of users from second generation to third generation devices can increase the bandwidth used on networks by up to five times.  So the pressure is on to increase the network infrastructure and the number of base transceiver stations available, but in some developing nations the existence of fibre - and the consequent supply of leased lines - is simply unavailable.  This has a knock-on effect in slowing down the installation of new cell sites.

One of the options available to mobile operators is to use 802.11 radio frequency equipment, but this also has its' own set of constraints.  Spectrum licenses are required for RF and the allocation of these can be a long drawn out process proving very costly for the operator.  Further to this the operator can often find the spectrum allocation required is not available in busy close knit cities as it has already been taken up by existing users.  Even more exasperating for the operator is the possibility of interference between competing RF links in the urban sprawl, resulting in operating problems for the operator and dissatisfied customers.

The Solution:  PAV's Free Space Optics solutions provide high bandwidth (E1 to 16x E1 links) communications up to maximum distances of 4km and is consequently ideal  infrastructure between BTS's and between BTS's and BSC's.

Providing there is clear line of sight between link heads the systems can be deployed on rooftops or towers without the need for time consuming spectrum licensing.  One of benefits of using FSO in congested urban environments is that there is no interference between links - a significant point when comparing this to the risk of interference between RF systems.

Advantages:  PAV's FSO solutions can easily be upgraded to cope with faster data rates as demands change.  Optical links can accommodate the current and future requirements of mobile operators as they move from 2G to 3G technology.  At the same time operators can make substantial savings by replacing leased lines with high bandwidth FSO links.

The rapid deployment capability of PAV's FSO systems makes a strong business case as new operational links can provide revenue generating communications within days.