EDGE原理介绍.pptVIP

Corporate Presentation 2004-11-10, GUC * * TEDLX / ETC EDGE 技术简要介绍 调制原理及编码方式 GPRS/EGPRS所使用的链路质量控制算法（GPRS/EGPRS LQC） Other Features Main content 1. EDGE 技术简要介绍 EDGE EDGE = Enhanced Data rates for Global Evolution EDGE is an accessory to GPRS ! -EGPRS Internet GGSN SGSN PCU BTS GPRS MS GPRS GPRS Protocol MS EGPRS EDGE TRU E GPRS Protocol SGSN Internet EGPRS = GPRS与EDGE的区别 ? EDGE =GPRS+EDGE Modulation GPRS与EDGE的主要区别 Modulation: GMSK vs 8PSK LA: Link adaptation IR: Incremental redundancy EGPRS mode TBFs only supported on 64 kbit/s abis TSs Both GPRS and EGPRS can be supported on 64 kbit/s abis TS EDGE is the name for the enhancements made from GPRS R’97 to GPRS R’99. EGPRS only refers to the packet switched (GPRS) enhancements made in the standard EDGE is a method to increase the data rates on the radio link for GSM EDGE is basically only a new modulation technique and new channel coding EDGE Basic Used to transmit both packet switched (PS) and circuit switched (CS) data/voice Whereas GPRS allow data rates up to 160 kbps on the physical layer, EGPRS is capable of offering up to 473,6 kbps. combined with improved link adaptation mechanisms. EDGE Basic, cont’d ? GPRS EDGE Modulation GMSK 8-PSK/GMSK Symbol rate 270 ksym/s 270 ksym/s Modulation bit rate 270 kb/s 810 kb/s Radio data rate per timeslot 22.8 kb/s 69.2 kb/s Max user data rate per timeslot 20 kb/s 59.2 kb/s Max user data rate (8 timeslots) 160 kb/s 473.6 kb/s EDGE/GPRS technical data 2. 调制原理及编码方式 GPRS and EGPRS Modulations I Q (0,1,1) (1,1,0) (1,0,1) (0,0,0) (0,0,1) (1,1,1) (1,0,0) (0,1,0) I Q “1” “0” GPRSGMSK Modulation EDGE GPRS (EGPRS):8PSK Modulation “1 bit per symbol” “3 bits per symbol” The modulation type that is used in GSM is called Gaussian Minimum Shift Keying (GMSK), which is a kind of phase modulation. Every symbol that is transmitted represents one bit, i.e. each shift in the phase represents one bit 8PSK, is a linear modulation, Nine coding schemes