行动通信标准演进.ppt

* OFDMA Symbol and Transparent RS Frame * OFDMA Symbol and Non-Transparent RS Frame * Bandwidth Request: Store-and-Forward Mode * Bandwidth Request: End-to-End Mode Centralized vs Distributed Scheduling Centralized Scheduling For small size of networks Only BS to do bandwidth allocations Distributed Scheduling For networks with hops greater than 2 Both RS and BS do bandwidth allocations * * Centralized Scheduling * Distributed Scheduling * Modules for Distributed Scheduling in BS/RS * Classification Addressing SS BS Uplink Downlink SFID SFID SFID SFID SFID : Service Flow Identifier (32 bits) CID : Connection Identifier (16 bits) * Scheduling Services Priority 802.16-2004 ServiceType 802.16e-2005 ServiceType Typical Appcations 1st UGS UGS T1/E1 transport VoIP without silence suppression 2nd ertPS ERT-VR VoIP with silence suppression 3rd rtPS RT-VR MPEG Video 4th nrtPS NRT-VR FTP with guaranteed minimum throughput 5th BE BE HTTP * QoS ParamSet UGS： Maximum Sustained Traffic Rate Minimum Reserved Traffic Rate Maximum Latency Tolerated Jitter Uplink Grant Scheduling Type Request/Transmission Policy ERT-VR： Maximum Sustained Traffic Rate Minimum Reserved Traffic Rate Maximum Latency Uplink Grant Scheduling Type Request/Transmission Policy RT-VR： Maximum Sustained Traffic Rate Minimum Reserved Traffic Rate Maximum Latency Uplink Grant Scheduling Type Request/Transmission Policy NRT-VR： Maximum Sustained Traffic Rate Minimum Reserved Traffic Rate Traffic Priority Uplink Grant Scheduling Type Request/Transmission Policy BE： Maximum Sustained Traffic Rate Traffic Priority Request/Transmission Policy QoS ParamSet * Bandwidth Allocation Uplink Packet Scheduler (802.16 Frame Maker) CIDs QoS-ParamSets INPUT OUTPUT UL-MAP UL-MAP :Uplink Map * Summary of MAC and the undefined part of IEEE 802.16 INPUT OUTPUT * Modulations Channel Size Access Range: QPSK QAM16 QAM 64 Data Rate: QAM64 QAM16 QPSK US European Uplink Mandarory Downlink Mandarory * Frame Durations with TDD