1. Adaptive QoS Management for IEEE 802.11 Future Wireless ISPs 通訊所 693430028 鄭筱親 Wireless Networks 10, 413–421, 2004

2. Outline IEEE 802.11 QoS IEEE 802.11 QoS Adaptive QoS provisioning management framework Adaptive QoS provisioning management framework Approach discussion Approach discussion Performance measurements Performance measurements

3. IEEE 802.11 QoS EDCF EDCF Minimum contention window Minimum contention window Different traffic class can use different values of the interframe space Different traffic class can use different values of the interframe space Diffserv (Differentiated Services) Diffserv (Differentiated Services) Expedited Forwarding (EF) Expedited Forwarding (EF) Assured Forwarding (AF) Assured Forwarding (AF) Best Effort (BE) Best Effort (BE)

4. Current research weakness Current research weakness Lack a management layer in the wireless network to react dynamically to the continuous fluctuation of the radio resource Lack a management layer in the wireless network to react dynamically to the continuous fluctuation of the radio resource The main point of this paper The main point of this paper Propose a management system to provide an adaptive provisioning of the QoS Propose a management system to provide an adaptive provisioning of the QoS by monitoring, and reacting to the evolving state of the wireless network resources by monitoring, and reacting to the evolving state of the wireless network resources using the mobile hosts requested QoS information along with the available resource and the WISP specific policies. using the mobile hosts requested QoS information along with the available resource and the WISP specific policies.

5. Adaptive QoS provisioning management framework System architecture System architecture Adaptive QoS description Adaptive QoS description Policy based management of the adaptive QoS provisioning Policy based management of the adaptive QoS provisioning

7. System architecture(1/3) The base stations are Diffserv based nodes The base stations are Diffserv based nodes Integrate the Diffserv edge and core router Integrate the Diffserv edge and core router provide the differentiated treatment to the mobile hosts downlink traffic provide the differentiated treatment to the mobile hosts downlink traffic Mobile hosts are Diffserv based nodes Mobile hosts are Diffserv based nodes Integrate the Diffserv edge and core router Integrate the Diffserv edge and core router Achieve the differentiated treatment for the uplink traffic Achieve the differentiated treatment for the uplink traffic

8. System architecture(2/3) SMM (Server Management Module) SMM (Server Management Module) Policy server Policy server Located in the base station of the wireless cell Located in the base station of the wireless cell Perform resource allocation Perform resource allocation CMM (Client Management Module) CMM (Client Management Module) Interact with the policy server Interact with the policy server Achieve the adaptive QoS provisioning management Achieve the adaptive QoS provisioning management

10. System architecture(3/3) IEEE 802.11 characteristics IEEE 802.11 characteristics Throughput variation with the number of active users supported by the base station Throughput variation with the number of active users supported by the base station Throughput variation which is related both to the distance of the mobile users from the base station and to the signal interference and fading Throughput variation which is related both to the distance of the mobile users from the base station and to the signal interference and fading Assume the size of the cell and the maximum number of supported users in the cell are limited Assume the size of the cell and the maximum number of supported users in the cell are limited

11. Adaptive QoS description (1/2) EF EF Low packet loss 、 Low packet delay 、 Low delay jitter Low packet loss 、 Low packet delay 、 Low delay jitter Provide a virtual leased line service Provide a virtual leased line service AF AF Comprises four classes of service ， each containing three drop precedence. Comprises four classes of service ， each containing three drop precedence. RED (Random Early Detection) RED (Random Early Detection) RIO (RED with In/Out of Profile) RIO (RED with In/Out of Profile)

12. Adaptive QoS description (2/2) Each WISP based on his business model Each WISP based on his business model WISP specifies different levels of QoS to the AF WISP specifies different levels of QoS to the AF

13. Policy based management of the adaptive QoS provisioning WISP management levels WISP management levels Policy server admission control Policy server admission control Adaptive QoS provisioning Adaptive QoS provisioning WISP scenario WISP scenario

14. WISP management levels Business level Business level Define policies Define policies Policies will enforce a best SLA Policies will enforce a best SLA Service level Service level Ensure the negotiated QoS parameters Ensure the negotiated QoS parameters Maximize the service availability Maximize the service availability Network level Network level Maintain connectivity in the network respecting the constraints of each class of service Maintain connectivity in the network respecting the constraints of each class of service Node level Node level Dynamically adjust the relative priorities of each class of service Dynamically adjust the relative priorities of each class of service Maintain the best QoS for EF class Maintain the best QoS for EF class

15. WISP management architecture

16. Policy server admission control (1/3) WISP specifies the proportion of allocated bandwidth for each class of service in the Diffserv architecture WISP specifies the proportion of allocated bandwidth for each class of service in the Diffserv architecture Policy server dynamically configures all the mobile hosts limiting traffic to the calculated proportion Policy server dynamically configures all the mobile hosts limiting traffic to the calculated proportion Providing an adaptive QoS provisioning Providing an adaptive QoS provisioning

17. Policy server admission control (2/3) The proportions of the bandwidth to be allocated The proportions of the bandwidth to be allocated P EF P EF P AF P AF P BE P BE The useful bandwidth when n sessions are active The useful bandwidth when n sessions are active C (n)=C/n (C is the useful bandwidth) C (n)=C/n (C is the useful bandwidth)

18. Policy server admission control (3/3) The bit rate of the active sources for each class of service The bit rate of the active sources for each class of service b b EF <P EF*C(n EF ) b b AF <P AF*C(n AF ) b b BE <P BE*C(n BE ) Over provisioning P EF +P AF+P BE<1 Elsewhere P EF +P AF+P BE=1

19. Adaptive QoS provisioning PDP (policy decision point) PDP (policy decision point) PEP (policy enforcement poin) PEP (policy enforcement poin) COPS (common open policy service) COPS (common open policy service) TPEP (terminal policy enforcement point) TPEP (terminal policy enforcement point) BS-PDP BS-PDP

21. WISP scenario (1/2)

22. WISP scenario (2/2) WISP admission control policies applied by the policy server ’ WISP admission control policies applied by the policy server ’ Accept new users until the maximum number in the cell is reached Accept new users until the maximum number in the cell is reached Accept new users in each class until the maximum number of each class is reached Accept new users in each class until the maximum number of each class is reached Downgrade only new AF clients in the cell Downgrade only new AF clients in the cell Downgrade all the AF clients in the cell Downgrade all the AF clients in the cell

23. Approach discussion Deployment of the Diffserv architecture in the wireless IEEE 802.11 networks with an adaptive management of different QoS levels Deployment of the Diffserv architecture in the wireless IEEE 802.11 networks with an adaptive management of different QoS levels The forces and weaknesses of the proposed policy based management in the wireless environment The forces and weaknesses of the proposed policy based management in the wireless environment

24. Performance measurements Scenario 1: CSMA/CA based hosts Scenario 1: CSMA/CA based hosts Scenario 2: Diffserv over CSMA/CA based hosts Scenario 2: Diffserv over CSMA/CA based hosts Scenario 3: Diffserv over CSMA/CA based hosts with the adaptive management Scenario 3: Diffserv over CSMA/CA based hosts with the adaptive management

28. THE END Thank you for your listening!!