GPRS_Principle1PPT（89页.pptVIP

GPRS BasicPrinciples  Mobile Network Planning Optimization Dept. You can be familiar with the following after taking this course. GPRS network characteristics and fabrication GPRS interfaces and protocols GPRS radio air interface technology GPRS work flow Evolution from GPRS to 3G GPRS Network Overview GPRS Radio Interface Element GPRS Mobility Management GPRS Session Management GPRS Data Transferring Process Process of Evolution from GPRS to 3G GPRS Network Overview GPRS Radio Interface Principle GPRS Mobility Management GPRS Session Management GPRS Data Transferring Process Evolution from GPRS to 3G Combination of logical channels Mode 1：PBCCH＋PCCCH＋PDTCH＋PACCH＋PTCCH Mode 2：PCCCH＋PDTCH＋PACCH＋PTCCH Mode 3：PDTCH＋PACCH＋PTCCH PCCCH = PPCH + PRACH + PAGCH + PNCH Service Volume When GPRS traffic is not intense, GPRS and circuit traffic generally share BCCH and CCCH in cells. In this case, mode 3 is needed. With the accumulation of traffic Packet common channel is needed to be configured in the cell. Channel combination is either mode 1 or mode 2. Concept of MS multi-slot class Element: maximum receiving TSL number (DL TS), maximum transmission TSL number (UL TS), and maximum TSL number Definition：level 1-29. multi-slot class get boosted as level mounts Factors affecting MS multi-slot class Whether transmit and receive can be done simultaneously Time for MS to make adjacent measurement, transceiver transmission and reception preparation Frequency hopping affecting time range跳频对时间要求影响的考虑 Target market thinning BSS should make best resource allocation according to MS multi-slot class, Qos requested and current resource allocation condition. A series Can attach GPRS network and GSM network simultaneously and PS and CS traffic can be conducted simultaneously. B series Can attach GPRS network and GSM network simultaneously and PS and CS traffic can be conducted simultaneously. C series Can’t attach GPRS network and GSM network simultaneously. Select either PS tr