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seminor presentation on wimax

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ANIL KUMAR

The document discusses key aspects of the IEEE 802.16 WiMAX standard. It describes WiMAX as providing broadband wireless access over long distances with high speeds. It outlines the MAC layer standards, including sublayers for convergence and management. It details the MAC frame structure, addressing, and scheduling priorities for different traffic types. Finally, it discusses advantages like mobility support, disadvantages like power consumption, and future applications of WiMAX technology.

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seminor presentation on wimax
What is WiMAX 802.16 Introduction 802.16 MAC Highlights MAC Convergence Sub-Layer (CS) MAC Common Part Sub-Layer (CPS) Advantages/disadvantages Future of WiMAX Questions
Worldwide Interoperability for Microwave Access (WiMAX) is the common name associated to the IEEE 802.16a/REVd/e standards. These standards are issued by the IEEE 802.16 subgroup that originally covered the Wireless Local Loop technologies with radio spectrum from 10 to 66 GHz.
Coverage range up to 50km and speeds up to 70Mbps(shared among users).
Sridhar IyerIIT Bombay 5
Goal: Provide high-speed Internet access to home and business subscribers, without wires. Base stations (BS) and subscriber stations (SS) Centralized access control to prevents collisions Supports applications with different QoS requirements WiMAX is a subset of IEEE 802.16 standard 6
Provide efficient transport of heterogeneous traffic supporting QoS Capable of broadband transmissions (2-75 Mbps) Accommodate both continuous and bursty traffic Mobile extensions: 802.16e Wireless Networks Spring 2007
SS has 48-bit IEEE MAC address BS has 48-bit base station ID Not a MAC address 24-bit operator indicator 16-bit connection ID (CID) 32-bit service flow ID (SFID) 16-bit security association ID (SAID)
ATM Convergence Sub-Layer: Support for VP/VC switched connections Support for end-to-end signaling of dynamically created connections ATM header suppression Full QoS support Packet Convergence Sub-Layer: Initial support for Ethernet, VLAN, IPv4, and IPv6 Full QoS support
Functions: Classification: mapping the higher layer PDUs (Protocol Data Units) into appropriate MAC connections. Payload header suppression (optional) MAC SDU (Service Data Unit), i.e, CS PDU, formatting Packet PDU (e.g., IP packet, Ethernet Packet) PHSI MAC SDU = CS PDU Payload Header Suppression Index Optional, Depending on upper layer protocol
Each SS has 3 management connections in each direction: Basic Connection: short and time-urgent MAC management messages MAC mgmt messages as MAC PDU payloads Primary Management connection: longer and more delay tolerant MAC mgmt messages MAC mgmt messages as MAC PDU payloads Secondary Management Connection: Standard based mgmt messages, e.g., DHCP, SNMP, etc IP packets based CS PDU as MAC PDU payload
Three components of 802.16 QoS Service flow QoS scheduling Dynamic service establishment Two-phase activation model (admit first, then activate) Service Flow A unidirectional MAC-layer transport service characterized by a set of QoS parameters, e.g., latency, jitter, and throughput assurances Identified by a 32-bit SFID (Service Flow ID) Three types of service flows Provisioned: controlled by network management system Admitted: the required resources reserved by BS, but not active Active: the required resources committed by the BS
UGS: Unsolicited Grant Services rtPS: Real-time Polling Services nrtPS: Non-real-time Polling Services BE: Best Effort
UGS: Unsolicited Grant Services For CBR or CBR-like services, e.g., T1/E1. The BS scheduler offers fixed size UL BW grants on a real-time periodic basis. The SS does not need to send any explicit UL BW req.
rtPS: Real-time Polling Services For rt-VBR-like services, e.g., MPEG video. The BS scheduler offers real-time, periodic, UL BW request opportunities. The SS uses the offered UL BW req. opportunity to specify the desired UL BW grant. The SS cannot use contention-based BW req.
nrtPS: non-real-time polling services For nrt-VBR-like services, such as, bandwidth-intensive file transfer. The BS scheduler shall provide timely (on a order of a second or less) UL BW request opportunities. The SS can use contention-based BW req. opportunities to send BW req.
BE: Best Effort For best-effort traffic, e.g., HTTP, SMTP. The SS uses the contention-based BW request opportunities.
Two types of Contention based UL slots Initial Ranging Used for new SS to join the system Requires a long preamble BW Request Used for sending BW req Short preamble Collision Detection and Resolution Detection: SS does not get the expected response in a given time Resolution: a truncated binary exponential backoff window
A Layer-2 sliding-window based flow control mechanism. Per connection basis. Only effective to non-real-time applications. Uses a 11-bit sequence number field. Uses CRC-32 checksum of MAC PDU to check data errors. Maintain the same fragmentation structure for Retransmission. Optional.
Two Major Functions: Secures over-the-air transmissions Protects from theft of service Two component protocols: Data encryption protocol A client/server model based Key management protocol (Privacy Key Management, or PKM)
Wimax Coverage Wimax High Speed Multi-functionality within Wimax Technology Wimax, cheap network Wimax Rich Features Smart antenna and Mesh Topology Ultra wide Band
Lack of Quality Wimax range Wimax Bandwidth Expensive network Bad Weather Power consuming Data Rate
Connectivity for SMBs Wimax Backhaul Nomadic Broadband Broadband for Developing Countries Private Networks
Future of WiMAX !!
Questions ??
IEEE802.16-2004 Alcatel White Paper: WiMAX, making ubiquitous high- speed data services a reality Intel White Paper: Understanding WiMAX and 3G for Portable/Mobile Broadband Wireless WiMAX Forum: www.wimaxforum.com http://en.wikipedia.org/wiki/WiMax
BS Base Station SS Subscriber Station, (i.e., CPE) DL Downlink, i.e. from BS to SS UL Uplink, i.e. from SS to BS FDD Frequency Division Duplex TDD Time Division Duplex TDMA Time Division Multiple Access TDM Time Division Multiplexing OFDM Orthogonal Frequency Division Multiplexing OFDMA - Orthogonal Frequency Division Multiple Access QoS Quality of Service
THANK YOU

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seminor presentation on wimax

  • 2. What is WiMAX 802.16 Introduction 802.16 MAC Highlights MAC Convergence Sub-Layer (CS) MAC Common Part Sub-Layer (CPS) Advantages/disadvantages Future of WiMAX Questions
  • 3. Worldwide Interoperability for Microwave Access (WiMAX) is the common name associated to the IEEE 802.16a/REVd/e standards. These standards are issued by the IEEE 802.16 subgroup that originally covered the Wireless Local Loop technologies with radio spectrum from 10 to 66 GHz.
  • 4. Coverage range up to 50km and speeds up to 70Mbps(shared among users).
  • 6. Goal: Provide high-speed Internet access to home and business subscribers, without wires. Base stations (BS) and subscriber stations (SS) Centralized access control to prevents collisions Supports applications with different QoS requirements WiMAX is a subset of IEEE 802.16 standard 6
  • 7. Provide efficient transport of heterogeneous traffic supporting QoS Capable of broadband transmissions (2-75 Mbps) Accommodate both continuous and bursty traffic Mobile extensions: 802.16e Wireless Networks Spring 2007
  • 8. SS has 48-bit IEEE MAC address BS has 48-bit base station ID Not a MAC address 24-bit operator indicator 16-bit connection ID (CID) 32-bit service flow ID (SFID) 16-bit security association ID (SAID)
  • 9. ATM Convergence Sub-Layer: Support for VP/VC switched connections Support for end-to-end signaling of dynamically created connections ATM header suppression Full QoS support Packet Convergence Sub-Layer: Initial support for Ethernet, VLAN, IPv4, and IPv6 Full QoS support
  • 10. Functions: Classification: mapping the higher layer PDUs (Protocol Data Units) into appropriate MAC connections. Payload header suppression (optional) MAC SDU (Service Data Unit), i.e, CS PDU, formatting Packet PDU (e.g., IP packet, Ethernet Packet) PHSI MAC SDU = CS PDU Payload Header Suppression Index Optional, Depending on upper layer protocol
  • 11. Each SS has 3 management connections in each direction: Basic Connection: short and time-urgent MAC management messages MAC mgmt messages as MAC PDU payloads Primary Management connection: longer and more delay tolerant MAC mgmt messages MAC mgmt messages as MAC PDU payloads Secondary Management Connection: Standard based mgmt messages, e.g., DHCP, SNMP, etc IP packets based CS PDU as MAC PDU payload
  • 12. Three components of 802.16 QoS Service flow QoS scheduling Dynamic service establishment Two-phase activation model (admit first, then activate) Service Flow A unidirectional MAC-layer transport service characterized by a set of QoS parameters, e.g., latency, jitter, and throughput assurances Identified by a 32-bit SFID (Service Flow ID) Three types of service flows Provisioned: controlled by network management system Admitted: the required resources reserved by BS, but not active Active: the required resources committed by the BS
  • 13. UGS: Unsolicited Grant Services rtPS: Real-time Polling Services nrtPS: Non-real-time Polling Services BE: Best Effort
  • 14. UGS: Unsolicited Grant Services For CBR or CBR-like services, e.g., T1/E1. The BS scheduler offers fixed size UL BW grants on a real-time periodic basis. The SS does not need to send any explicit UL BW req.
  • 15. rtPS: Real-time Polling Services For rt-VBR-like services, e.g., MPEG video. The BS scheduler offers real-time, periodic, UL BW request opportunities. The SS uses the offered UL BW req. opportunity to specify the desired UL BW grant. The SS cannot use contention-based BW req.
  • 16. nrtPS: non-real-time polling services For nrt-VBR-like services, such as, bandwidth-intensive file transfer. The BS scheduler shall provide timely (on a order of a second or less) UL BW request opportunities. The SS can use contention-based BW req. opportunities to send BW req.
  • 17. BE: Best Effort For best-effort traffic, e.g., HTTP, SMTP. The SS uses the contention-based BW request opportunities.
  • 18. Two types of Contention based UL slots Initial Ranging Used for new SS to join the system Requires a long preamble BW Request Used for sending BW req Short preamble Collision Detection and Resolution Detection: SS does not get the expected response in a given time Resolution: a truncated binary exponential backoff window
  • 19. A Layer-2 sliding-window based flow control mechanism. Per connection basis. Only effective to non-real-time applications. Uses a 11-bit sequence number field. Uses CRC-32 checksum of MAC PDU to check data errors. Maintain the same fragmentation structure for Retransmission. Optional.
  • 20. Two Major Functions: Secures over-the-air transmissions Protects from theft of service Two component protocols: Data encryption protocol A client/server model based Key management protocol (Privacy Key Management, or PKM)
  • 21. Wimax Coverage Wimax High Speed Multi-functionality within Wimax Technology Wimax, cheap network Wimax Rich Features Smart antenna and Mesh Topology Ultra wide Band
  • 22. Lack of Quality Wimax range Wimax Bandwidth Expensive network Bad Weather Power consuming Data Rate
  • 23. Connectivity for SMBs Wimax Backhaul Nomadic Broadband Broadband for Developing Countries Private Networks
  • 26. IEEE802.16-2004 Alcatel White Paper: WiMAX, making ubiquitous high- speed data services a reality Intel White Paper: Understanding WiMAX and 3G for Portable/Mobile Broadband Wireless WiMAX Forum: www.wimaxforum.com http://en.wikipedia.org/wiki/WiMax
  • 27. BS Base Station SS Subscriber Station, (i.e., CPE) DL Downlink, i.e. from BS to SS UL Uplink, i.e. from SS to BS FDD Frequency Division Duplex TDD Time Division Duplex TDMA Time Division Multiple Access TDM Time Division Multiplexing OFDM Orthogonal Frequency Division Multiplexing OFDMA - Orthogonal Frequency Division Multiple Access QoS Quality of Service