4G 无线宽带通信网WiMAX_LTE.ppt

* Classification 屬 SSCS Addressing、Scheduling services、QoS ParamSet、Bandwidth allocation 屬於 CPS Framing durations、Duplexing techniques、Modulation、Channel size 屬 PHY * 1.上層服務產生資料流 2.每一個上層session所產生的資料流配置一個SFID,同時產生專屬該SFID的 QoS Paramset 3.不同的SFID可被安排屬於同一個CID**傳送資料時以CID為source destination Address 4.實體層傳送資料 * 802.16-2004 Unsolicited Grant Service（UGS） Real-Time Polling Service（rtPS） Non-Real-Time polling Service（nrtPS） Best Effort（BE） 802.16e-2005 Unsolicited Grant Service（UGS） Extended Real-Time Polling Service (ERT-VR) Real-Time Polling Service (RT-VR) Non-Real-Time Polling Service (NRT-VR) Best Effort（BE） * QoS-ParamSet 的三個階段 Provisioned-QoS-ParamSet Admitted-QoS-ParamSet Active-QoS-ParamSet * ….. to allow vendors to optimize system performance by using different combinations of these bandwidth allocation techniques while maintaining consistent interoperability definitions……引述自 802.16-2004 DSA : Dynamic Service Addition DSC : Dynamic Service Change DSD : Dynamic Service Deletion * * AAI_REG-REQ: 3 bits * IEEE WiMAX Frame Structure Basic WiMAX Frame Structure Type-1 AAI subframe that consists of 6 OFDMA symbols. Type-2 AAI subframe that consists of 7 OFDMA symbols. Type-3 AAI subframe that consists of 5 OFDMA symbols. Type-4 AAI subframe that consists of 9 OFDMA symbols. This type shall be applied only to an UL AAI subframe for the 8.75 MHz channel bandwidth when supporting the WirelessMANOFDMA frames. 802.16e V.S. 802.16m 802.16e 802.16m Bandwidth(MHz) 10 10 Sampling frequency(MHz) 11.2 11.2 FFT size 1024 1024 Sub-carrier frequency spacing(kHz) 10.94 10.94 Frame duration(ms) 5 5 Useful symbol time(us) 91.4 91.4 Guard time(us) 11.4 11.4 OFDMA symbols 48 48 OFDMA symbol duration(us) 102.9 102.9 Number of used sub-carriers 841(840) 865 Number of guard sub-carriers 183(184) 159 Number of pilot sub-carriers 120 120 Number of data sub-carrier 720 745 Data rate for QPSK(Mbps) 13.82 14.30 Data rate for 16QAM(Mbps) 27.65 28.61 Data rate for 64QAM(Mbps) 41.47 42.91