esigners should refer to specific product information and the system capabilities before they design the pool.) Also, the number of Abis channels will increase when signalling is added to it, which again depends upon the system being used in the network. The Abis channels that are present in the pool are also known as 'slaves'. Based on the requirements of mobile subscribers, the sub-time slots from the pool are requested. The number of time slots allocated to the pool is usually in whole numbers - one, two, three, four or more time slots - depending on the DAP handling capacity of the system. Obviously, the number of time slots allocated to the DAP cannot be more than 30 (if TSO and TS31 are 'reserved' for management purposes). Dimensioning of dynamic Abis means dimensioning of the pool. Once the number of time slots required for DAP is known, the remaining process becomes similar to dimen- sioning/planning of GSM/GPRS transmission networks. The main idea behind DAP dimensioning is to find the number of time slots that can be assigned to a pool in such a manner that the Abis interface does not become a limitation for EDGE NETWORK PLANNING Minimum Abis Coding Scheme Bit rate (bps) PCM allocation 8,000 12,000 14,400 20,000 MCS-1 8,800 MCS-2 11,200 MCS-3 14,800 MCS-4 17,600 MCS-5 22,400 MCS-6 29,600 MCS-7 44,800 MCS-8 54,400 MCS-9 59,200 Figure 6.6 Transmission requirement for EGPRS coding schemes at the Abis interface the air interface throughput. Thus the main inputs for this would be the number of radio time slots required for PS traffic (i.e. dedicated and default territory in an EDGE radio network), the capacity of radio time slots, blocking that could take place on the Abis interface, Based on these inputs and the number of PCM time slots available for the pool, the required number of PCM time slots can be calculated. Obviously, limitations and capability of the equipment needs to be taken into consideration. So: (6.3) where B is the blocking probability of the DAP, N is the number of time slots available in 