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移動式下 WiMAX 模擬平台建制與效能評估之研究

Design of Mobility WiMAX Simulation Platform and Performance Evaluation. 移動式下 WiMAX 模擬平台建制與效能評估之研究 . Adviser: Ho-Ting Wu Presenter: Chi-Fong Yang Institute of Computer Science and Information Engineering National Taipei University of Technology. Outline. Introduction for IEEE 802.16 Std.

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移動式下 WiMAX 模擬平台建制與效能評估之研究

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  1. Design of Mobility WiMAX Simulation Platform and Performance Evaluation 移動式下WiMAX模擬平台建制與效能評估之研究 Adviser: Ho-Ting Wu Presenter: Chi-Fong Yang Institute of Computer Science and Information Engineering National Taipei University of Technology

  2. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  3. Worldwide Interoperability for Microwave Access • WiMAX? • Worldwide Interoperability for Microwave Access • IEEE 802.16 specifies the air interface of fixed and mobile BWA systems • Wireless broadband network connection technique • Replace last mile • Cost saving and easy to deploy • Support high transmission rate

  4. IEEE 802.16 Family • IEEE 802.16d (July 2004) • Integrate both IEEE 802.16 and 802.16a • MAC supported : TDD/FDD, QoS, ARQ(Automatic Repeat Request) • Three PHYs specified : Single Carrier, OFDM, OFDMA • IEEE 802.16e(December 2005) • Update and expand IEEE 802.16 – 2004 to allow for mobile subscriber stations • IEEE 802.16f(Active Amendment) • Management Information Database • IEEE 802.16g(Active Amendment) • Management Plane Procedures and Services • Define WiMAX system management flow • WiMAX equipment compatibility • IEEE 802.16j(Active Amendment) • Multi-hop relay specification • IEEE 802.16h(Amendment under development) • Improved coexistence mechanisms for license-exempt operation • IEEE 802.16m(Amendment at pre-draft stage) • Higher data rate(100 Mbps for mobile application, 1 Gbps for fixed application)

  5. WiMAX Network Topology

  6. IEEE 802.16 Protocol Layering • CS function • Classification. • Header suppression • CPS functions • Network entry and initialization • Service flow management • QoS mechanisms • Mobility management • Security Sublayer • Authentication • Secure key exchange • Encryption

  7. Media Acces Control • Downlink transmission • Preamble • Synchronization and equalization • DL-MAP/UL-MAP • Defines downlink/uplink channel access • Defines downlink/uplink data burst profiles • DCD/UCD • Defines downlink/uplink channel description • Uplink transmission • Contention opportunities for SS/MS initial ranging • Contention opportunities for bandwidth requests • Contention-free periods assigned by BS to individual SS/MS • Connection oriented • Connection identifier(16 bits)

  8. OFDM Frame Structure with TDD

  9. Network Entry and Initialization • Phases • Scan for DL channel and establish synchronization with the BS • Obtain transmit parameters(UCD/DCD) • Initial ranging • Basic capability negotiation • Authorization and key exchange • Registration • Establish IP connectivity • Establish time of day • Transfer operational parameters • Connection setup

  10. Connection and Service Flow • Connection • CID is a 16-bits value that identifies a connection • A unidirectional mapping between BS and SS/MS peers • Purpose of transporting a service flow traffic • A CID maps to a service flow identifier(SFID) • Service flow • SFID is a 32-bits value that identifies a service flow • A unidirectional flow of MAC service data units(SDUs) on a connection • Particular QoS provided • SS-initialed or BS-initialed

  11. Bandwidth Request/Grand Mechanism • Contention-based bandwidth requests • Broadcast polling • Multicast group polling • Contention-free bandwidth requests • Unicast polling • Piggyback • The bandwidth request is piggybacked onto a MAC PDU on an existing connection • Bandwidth grant • Grant Per Subscriber Station(GPSS) • Grant Per Connection(GPC)

  12. Mobility Management • Power management • Serving BS air interface resources • Minimize MS power usage and decrease usage • Sleep mode • Handover • Start with either MOB_MSHO-REQ or MOB_BSHO-REQ • Hard Handover(break-before-make handover) • Soft Handover(make-before-break handover) • Macro Diversity Handover(MDHO) • MS transmit to and receive from multiple BSs at the same time • Fast BS Switching(FBSS) • MS to receive/transmit data from/to the Anchor BS

  13. Handover Procedure • Cell reselection • Scanning procedure • Association procedure • Handover decision and initiation • MS to handover from a serving BS to a target BS • Proceed with a notification through either MOB_MSHO-REQ or MOB_BSHO-REQ • BSs specified in MOB_BSHO-RSP is recommended • Synchronization • Synchronize to downlink transmissions of Target BS • Obtain downlink and uplink transmission parameters • Ranging • Collection of processes by witch SS and BS maintain the quality of RF commutation link

  14. HO Flowchart SS HO initialed BS HO initialed

  15. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  16. Design of QoS Simulation Platform

  17. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  18. Service Flow Maintenance DSA Flow DSC Flow DSD Flow • Dynamic Service Addition • DSA-REQ/DSA-RSP/DSA-ACK • Dynamic Service Change • DSC-REQ/DSC-RSP • Dynamic Service Deletion • DSD-REQ/DSD-RSP

  19. BS Initiated DSA-REQ Flowchart

  20. SS Initiated DSA-REQ Flowchart

  21. Mandatory CAC Algorithm

  22. CAC Flowchart

  23. CID Assigned m = 0x2000

  24. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  25. Scheduling Services • Unsolicited Grant Service(UGS) • Support real-time service flows • Fixed-size data packets on a periodic interval • T1/E1 and VoIP without silence suppression • Extended rtPS(ertPS) • Scheduling mechanism which builds on the efficiency of both UGS and rtPS • VoIP with silence suppression • Real-time Polling Service(rtPS) • Support real-time service flows • Variable-sized data packets on a periodic interval • MPEG video • Non-real-time Polling Service(nrtPS) • Support non-real-time service flows • FTP • Best Effort(BE) • provide efficient service • Web, e-mail

  26. Classifier Flowchart

  27. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  28. Mandatory BWA Algorithm

  29. Mandatory Channel Coding per Modulation 16-Subchannel

  30. BWA Flowchart

  31. BWRA Flowchart

  32. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  33. Mandatory Packet Scheduling Mechanism • Strict Priority • UGS>ertPS>rtPS>nrtPS>BE • Well-known packet scheduling algorithm • FIFO(First Input First Output) • EDF(Earlies Deadline First) • WFQ(Weighting Fair Queue) • RR(Round Robin)

  34. Packet Scheduling Algorithm • FIFO • Find out the arrival time of packet • Bubble sorting • EDF • Deadline = arrival time + maximum delay • Bubble sorting • RR • Polling all active connection

  35. Packet Scheduling Algorithm • WFQ • Find out the finish time for each packet • Base on weighting of per connection

  36. Outline • Introduction for IEEE 802.16 Std. • Design for QoS Simulation Platform • Call Admission Control Mechanism • Classifier Mechanism • Bandwidth Allocation Mechanism • Packet Scheduling Mechanism • Performance Evaluation Base on VVoIP • Conclusion and Future Works

  37. Performance Evaluation Base on VoIP • VoIP • Session Initiation Protocol • Performance evaluation in fixed environment • Performance evaluation in mobility environment • SIP Performance Adjustment • Media Independent Handover Service supported • Adaptive codec adjustment

  38. SIP • Session Initiation Protocol • Application layer control protocol for creating, modifying and terminating sessions • Similar to that of HTTP or SMTP • Text-encoded protocol • RFC 3261 from the Internet Engineering Task Force (IETF) • Main functions • Invite users to sessions • Modification of sessions • Termination of sessions • SIP messages • SIP message = Request | Response • The request specifies the type of request • The response indicates the success or failure of a given request

  39. SIP Call Setup Flowchart L2 connection L3 Session • Session • L3+ message communication • SIP Session • SIP signaling • RTP • Connection • L2 communication • Service flow

  40. MIH • Media Independent Handover Service • Draft of IEEE 802.21 Std. • Adaptation support at the application level • Common interface • Primary Services of MIH • Media Independent Event Service(MIES) • Media Independent Command Service(MICS) • Media Independent Information Service(MIIS)

  41. MIH Architecture

  42. MIH Service supported

  43. Adaptive Codec Adjustment for Voice Transmission • Dynamic voice codec adjustment • Dependent on SNR and modulation rate • Three codecs supported : G.711, G.726, G.729

  44. Adaptive Codec Adjustment for Video Transmission • Dynamic video codec adjustment • Dependent on SNR and modulation rate • H.264 encode supported

  45. Simulation Environment

  46. Traffic Parameters

  47. System Topology of Simulation Experiment

  48. Modulation Rate Detection

  49. Probability of Session Blocked

  50. Comparison between Fixed Session Blocked and Mobility Session Blocked

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