h as which kind of service is to be offered and where (with a big impact on the number of sites). Capacity Limited Scenario In this case the load on the system is greater than the initially used value for computation of the cell range, which means that either the cell size decreases or the capacity increases. If the system load remains more Radio Network Dimensioning Table 2.5 Summary of the key EGPRS parameters Parameter(s) Conceptual explanation Radio Timeslot allocation Affects how the packet switched allocation of timeslots is performed. This includes prioritisation between different bands (850/1900 or 900/1800) and also prioritisation between GSM voice and multislot EGPRS data calls Link adaptation thresholds Adjusts the algorithm for changing between different and modulation coding MCSs to maximise throughput and latency while scheme allocation ensuring adequate forward error correction in changing channel conditions BTS power back-off Reduces the maximum transmitted power of the GSM transmitter. Can be used to balance an uplink limited network and reduce interference at the cost of reducing the coverage footprint. Also can be used to minimise the effect of link imbalance caused by changing between 8-PSK and GMSK modulation One-phase access Sets the radio network to support an 11-bit RACH (random access channel) and directly assign EGPRS radio timeslots based on the mobile capability. This effectively reduces the latency of initial access to the network TBF release delay Adjusts the time (in seconds) in which the network will release the TBF (temporary block flow) after idle transmission. Optimum settings will be based on the predominant application since long release delays significantly reduce latency of successive access to the network at the cost of reserving TBF radio resources Transmission EGPRS transmission Allocates the appropriate number of 16 kbps Abis subtimeslots and 64 kbps DSO T1/E1 transmission between the BSC and BTS. This ensures that multislot EGPRS data traffic demand for higher 8-PSK MCS