Network Planning and Optimisation Pre-conditions: A plan for GSM network exists. Selection of cells for GPRS use Service area analysis: Is the wanted service area for Adding new cells and GPRS achieved - Coverage Carriers if needed (including / Frequency Plan - User frequency allocation, etc.) Throughput Parmeter setting for specific cell groups introduced. Based on operator strategy Capacity analysis: Are the wanted capacities for GPRS and GSM achieved? Postconditions: Plan is ready for GPRS introduction Figure 2.3 Flowchart of the planning process when GPRS is introduced to network transfer rate is 50 RLC/MAC blocks/second, this can be multiplied by the payload (in bits)/RLC/MAC block (depending on the RLC Coding Scheme utilized) to calculate the effective timeslot throughput. Since most EGPRS devices are capable of two to four simultaneous timeslots, the additional radio timeslots assigned to the mobile will increase the throughput accordingly. Multiple EGPRS timeslots will be assigned to the mobile based on the availability of idle timeslots. To balance the load, conges- tion and blocking of GSM voice and EGPRS data calls, various algorithms and parameters must be considered. To maintain link quality, link adaptation and incremental redundancy techniques are introduced in the EGPRS system. Link adaptation dynamically adjusts the modulation and coding schemes based on estimated channel conditions. Incremental redundancy adjusts the code rate to actual channel conditions. This is done by incrementally transmitting redundancy until decoding is successful. Preplanning in a GSM Radio Network RLC Blocks RLC/MAC Blocks 1 TDMA frame = 4.615 ms = BURST PERIOD TDMA Bursts 4 X TDMA Frames = 4 Bursts = 1 RLC/MAC block = 18.46 ms B0(0..3) B1(4..7) B2(8..11) B3(13..16) B4(17..20) B5(21..24) B6(26..29) B7(30..33) B8(34..37) B9(39..42) B10(43..46) B11(47..50) 52 TDMA Frames (240 ms) 12 X RLC/MAC Blocks = 1 x 52 PDCH MultiFrame = 240 ms 12 RLC/MAC Blocks / 0.240 S = 50 RLC/MAC Blocks/s Figure 2.4 RLC block transmission Standa