 crucial for evolution of the network towards the newest technologies. Radio Network Planning and Optimisation Downlink Path Loss (Static 1900) Uplink Path Loss (Static 1900) Link Balance (Static 1900) Reference Coverage Footprint Voice (>=Q3) MCS-1 MCS-2 MCS-3 MCS-4 MCS-5 MCS-6 MCS-7 MCS-8 MCS-9 Figure 2.73 Voice versus EGPRS path loss 2.9.2 Optimisation in the EGPRS Network The process of EGPRS optimisation can start by reviewing the link budget (see Figure 2.9, dimensioning in the EGPRS network). The graph in Figure 2.73 depicts the uplink and downlink path losses plus link balance based on a given reference coverage footprint. While real world/practical path loss and link balance will vary dynamically based on the fading environment and equipment used (MS, BS), the following generalizations can be made with respect to all EGPRS link budget planning: MCS3 and voice link performance are comparable due to similar forward error correction (FEC) characteristics. As higher MCSs are used, the 'service area' is reduced due to a gradual decrease in receiver sensitivities. As higher MCSs are used, the link imbalance increases due to BS receiver performance always being better than mobile receiver performance. Noting the above, it is very possible to achieve a 'pseudo-balanced' network assuming different coding schemes are independently link adapted on the uplink and downlink. In this scenario, link balance may be achieved for a given set of channel conditions if the subscriber's required quality of service is satisfied (assuming asymmetrical uplink and downlink bandwidth requirements for a given application). As part of EGPRS link planning and optimization, the following key considerations need to be reviewed (the detailed reasons and significance of each of these on EGPRS performance is detailed in later sections): For 8-PSK, the average TX power is backed off. In the EGPRS link budget example included in this text, the site TRX backs off 2 dB while the MS backs off 4 dB. Radio Network Optimisation Receiver sensitivit