e requirements for signalling channels for TRXs and BCF are the same as in GSM/GPRS networks. The pilot bits for synchronisation can be accommodated in the TSO or TS31 (or any other time slot). Dimensioning of the Dynamic Abis Interface The dynamic nature of the Abis interface, and the allocation of a group of time slots for the DAP, changes the static capacity calculations of GSM/GPRS networks. In the latter, the Abis interface allocates the whole capacity for the transceiver irrespective of usage; that EDGE: NETWORK PLANNING AND OPTIMISATION LINK MANAGEMENT GSM/GPRS radio timeslot TCH.1 TCH.2 TCH.3 TCH.4 TCH.5 TCH.6 TCH.7 TCH.8 data (upto data rate of 16 kbps) TCH.1 TCH.2 TCH.3 TCH.4 can be fitted into 16 kbps TCH.5 TCH.6 TCH.7 TCH.8 TCH.1 TCH.2 TCH.3 TCH.4 sub-timeslots on Abis interface TCH.5 TCH.6 TCH.7 TCH.8 TCH.1 TCH.2 TCH.3 TCH.4 TCH.5 TCH.6 TCH.7 TCH.8 TCH.1 TCH.2 TCH.3 TCH.4 TCH.5 TCH.6 TCH.7 TCH.8 TCH.1 TCH.2 TCH.3 TCH.4 TCH.5 TCH.6 TCH.7 TCH.8 TCH.1 TCH.2 TCH.3 TCH.4 TCH.5 TCH.6 TCH.7 TCH.8 TCH.2 TCH.3 TCH.4 TCH.5 TCH.6 TCH.7 TCH.8 Data rate beyond 16kbps on TCH.1 TCH.2 TCH.3 TCH.4 air interface need master TCH.5 TCH.6 TCH.7 TCH.8 and slave timeslots on TCH.1 TCH.2 TCH.3 TCH.4 TCH.5 TCH.1. Dynamic ATCHT Abis interface TCH.5 TCH.6 TCH.7 TCH.8 TCH.1 TCH.2 TCH.3 TCH.4 ICH.5 TCH.6 TCH.7 TCH.8 TRXSIGI OMUSIGI TRXSIG2 OMUSIG2 TRXSIG3 OMUSIG3 TRXSIG4 OMUSIG4 TRXSIG5 OMUSIG5 TRXSIG6 OMUSIG6 TRXSIG7 OMUSIG7 TRXSIG8 OMUSIG8 TRXSIG9 OMUSIG9 TRXSIG10 OMUSIGIO TRXSIG11 OMUSIGII TRXSIG12 OMUSIG12 'Dynamic' Abis Figure 6.5 Timeslot allocation on dynamic Abis makes the capacity calculations simpler, because knowledge of the number of TRXs and the signalling rate leads to the amount of capacity required on the Abis interface. Before we look into DAP dimensioning, it should be remembered that DAP is used only for packet data for an MCS scheme greater than 2. Also, for each of the coding schemes, the number of required traffic channels will vary from none in MCS-1 (or CS-1) to four in MCS-8/9, as shown in Figure 6.6. (D