t full power GMSK compared to attempting immediately to establish a higher MCS and to fail due to decreasing average power for 8- PSK. By ensuring that a more robust MCS is initially allocated, the connection reliability is enhanced SO that the data session can establish and continue smoothly. Figure 2.91 shows the uplink and downlink TBF failure rates (inverse of TBF setup success rates) of several networks. In this example, the typical range for uplink TBF failures is between 6 % and 8 % while downlink TBF failures initially ranged from 3 % to % and then began to stabilise below 2 %. Also note From 10/01/2005 to 01/21/2006, Band: All From 10/01/2005 to 01/21/2006, Band: All 10-01-2005 11-01-2005 12-01-2005 01-01-2006 10-01-2005 -01-2005 12-01-2005 01-01-2006 MCS9 DL block (%). All MCS8 DL block (%). All MCS7 DL block (%). All MCS9 DL block (%). All MCS8 DL block (%). All MCS7 DL block (%), All MCS6 DL block (%). All MCS5 DL block (%). All MCS4 DL block (%). All MCS6 DL block (%). All MCS5 DL block (%). All MCS4 DL block (%). All MCS3 DL block (%). All MCS2 DL block (%). All MCS1 DL block (%). All MCS3 DL block (%). All MCS2 DL block (%). All MCS1 DL block (%). All From 10/01/2005 to 01/21/2006, Band: All From 10/01/2005 to 01/21/2006, Band: All 10-01-2005 11-01-2005 12-01-2005 01-01-2006 10-01-2005 11-01-2005 12-01-2005 01-01-2006 MCS9 UL block (%). All MCS8 UL block (%). All MCS7 UL block (%). All MCS9 UL block (%). All MCS8 UL block (%). All MCS7 UL block (%). All MCS6 UL block (%). All MCS5 UL block (%). All MCS4 UL block (%). All MCS6 UL block (%). All MCS5 UL block (%). All MCS4 UL block (%). All MCS3 UL block (%). All MCS2 UL block (%). All MCS1 UL block (%). All MCS3 UL block (%). All MCS2 UL block (%). All MCS1 UL block (%). All Figure 2.89 Measured uplink and downlink MCS distribution Radio Network Optimisation DL TBF Est Sucess Rate (%) From 7/1/2005 to 08/18/2005, Band:All 07-05-2005 07-10-2005 07-20-2005 08-09-2005 08-10-2005 Figure 2.90 Sample downlink TBF establishment success rate UL TBF est Fail