1. A Study of the Bandwidth Management Architecture over IEEE 802.16 WiMAX Student :Sih-Han Chen Advisor : Ho-Ting Wu Date : 2008.4.29

2. Outline Introduction of IEEE802.16 QoS Proposed QoS System Architecture Pairing Call Admission Control Algorithm Borrow Bandwidth Algorithm on CAC level Bandwidth Allocation Algorithm Simulation Result Conclusion and Future Work 4/29/2008Page 2

3. 4/29/2008Page 3 Wireless Technologies Bandwidth 1 Gbps 100 Mbps 10 Mbps 1 Mbps PANLANMANWAN <1m 10m 100m Up to 50Km Up to 80Km 802.15.1 Bluetooth Wi-Fi 802.11a/g Wi-Fi 802.11b 802.15.3 High Speed Wireless PAN Wi-MAX 802.16 (802.16-2004 & 802.16e) 4G 3G 2.5G IEEE 802.15 IEEE 802.11 IEEE 802.16 3GPP PAN: Personal area networksMAN: Metropolitan area networks LAN: Local area networksWide area networks

4. 4/29/2008Page 4 IEEE 802.16 Operation Mode

5. 4/29/2008Page 5 MAC Common Part Sublayer Defines multiple-access mechanism Functions ： –connection establishment –connection maintenance –Call admission control –bandwidth request –bandwidth allocation MAC Common Part Sublayer (MPC)

6. 4/29/2008Page 6 IEEE 802.16 TDD frame structure

7. 4/29/2008Page 7 DL-MAP and UL-MAP

8. 4/29/2008Page 8 Downlink Subframe Broadcast

9. 4/29/2008Page 9 Uplink Subframe

10. 4/29/2008Page 10 Media Acces Control (MAC) Connection orienteded –Service Flow(SF) –Connection ID (CID) Channel access: –UL-MAP Defines uplink channel access Defines uplink data burst profiles –DL-MAP Defines downlink data burst profiles –UL-MAP and DL-MAP are both transmitted in the beginning of each downlink subframe (FDD and TDD).

11. 4/29/2008Page 11 Bandwidth Request SSs may request bandwidth in 3 ways: –Use the ”contention request opportunities” interval upon being polled by the BS (unicast, multicast or broadcast poll) –Send a standalone MAC message called ”BW request” in an already granted slot –Piggyback a BW request message on a data packet

12. 4/29/2008Page 12 Bandwidth Allocation BS grants/allocates bandwidth in one of two modes –Grant Per Subscriber Station (GPSS) –Grant Per Connection (GPC) Decision based on requested BW, QoS parameters and available resources Grants are realized through the UL-MAP

13. 4/29/2008Page 13 Service Classes Unsolicited Grant Services (UGS): –Constant Bit Rate (CBR) services, –T1/E1 emulation, and Voice Over IP (VoIP) Real-Time Polling Services (rtPS): –real-time services variable size data packets –MPEG video or VoIP with silence suppression. Non-Real-Time Polling Services (nrtPS): –Used for delay tolerant traffic requiring some minimum data rate –FTP Best Effort Services (BE) : –Used for streams with no rate guarantees. –WEB, HTTP

14. IEEE 802.16 QoS Provisioning Service Flow QoS Scheduling Dynamic Service Establishment Two-phase Activation 4/29/2008Page 14

15. Service Flow The central concept of the MAC protocol A service flow is a unidirectional flow of packets that is provided a particular QoS. SS and BS provide this QoS according to the QoS parameter set. Existing in both uplink and downlink and may exist without being activated. Must have a 32bit SFID, besides admitted and active status also have a 16-bit CID 4/29/2008Page 15

16. Attributes of a Service Flow Service Flow ID CID Provisioned Qos Parameter Set Admitted QoS Parameter Set Active QoS Parameter Set Authorization Module 4/29/2008Page 16

17. Relationship of QoS Parameter Set 4/29/2008Page 17 Authorized QoS Parameter Set = Provisioned QoS Parameter Set (SFID) Admitted QoS Parameter Set (SFID & CID) Active QoS Parameter Set (SFID & CID)

18. Type of Service Flow Provisioned Service Flows –Provided by external network management system –Admitted and Active QoSParamSet are NULL Admitted Service Flows –Reserved resource according AdmittedQoSParamSet, but not yet activated –First Stage of two-phase activation model Active Service Flows –Active QoS Parameter Set is non-NULL –Second Stage of two-phase activation model 4/29/2008Page 18

19. Dynamic Service Management Dynamic Service Activate (DSA) –Activate a service flow Dynamic Service Change (DSC) –Change an existing service flow Dynamic Service Delete (DSD) –Delete a service flow 4/29/2008Page 19

20. Dynamic Service Establishment 4/29/2008Page 20

21. Outline Introduction of IEEE802.16 QoS Proposed QoS System Architecture Pairing Call Admission Control Algorithm Borrow Bandwidth Algorithm on CAC level Bandwidth Allocation Algorithm Simulation Result Conclusion and Future Work 4/29/2008Page 21

22. 4/29/2008Page 22

23. Outline Introduction of IEEE802.16 QoS Proposed QoS System Architecture Pairing Call Admission Control Algorithm Borrow Bandwidth Algorithm on CAC level Bandwidth Allocation Algorithm Simulation Result Conclusion and Future Work 4/29/2008Page 23

24. 4/29/2008Page 24

25. Proposeed QoS Architecture 4/29/2008Page 25 Two Stage Bandwidth Allocation Downlink Packet Scheduler Core Network Applications Pair Call Admission Control Bandwidth Borrowing Agent Uplink Packet Scheduler Downlink Data Traffic Connection Request Connection Response UGS rtPS nrtPS BE Uplink Data Traffic Two Stage Bandwidth Allocation UGS rtPS nrtPS BE Down Stream (DL/UL MAP) Up Stream BS SS

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