Presentation is loading. Please wait.

Presentation is loading. Please wait.

IEEE ICC 2012 - COMMUNICATION QOS, RELIABILITY AND MODELING SYMPOSIUM ARTHUR: SEYED VAHID AZHARI, HANI NEMATI PRESENTER: 侯宗佑 Stability Analysis of Tandem.

Similar presentations


Presentation on theme: "IEEE ICC 2012 - COMMUNICATION QOS, RELIABILITY AND MODELING SYMPOSIUM ARTHUR: SEYED VAHID AZHARI, HANI NEMATI PRESENTER: 侯宗佑 Stability Analysis of Tandem."— Presentation transcript:

1 IEEE ICC 2012 - COMMUNICATION QOS, RELIABILITY AND MODELING SYMPOSIUM ARTHUR: SEYED VAHID AZHARI, HANI NEMATI PRESENTER: 侯宗佑 Stability Analysis of Tandem SIP Proxies

2 Outline  Introduction  Fluid Flow Model  Lyapunov stability  Stabilizing Algorithm  Conclusion

3 SIP protocol Signaling Communications Protocol IETF,RFC 2543, latest RFC 3261 Setup, modify, tear down multimedia sessions Text-based protocol (like http, smtp) Media stream use RTP protocol

4 SIP protocol(cont’d)

5 Lyapunov Stability Mostly used for non-linear dynamic system Stay near Equilibrium point

6 Fluid Flow Model

7 Fluid Flow Model(Cont’d) Assumption:  Infinite queues,  negligible packet loss and processing time,  only Invite and OK message State variable: weighted number of Invite message queues on proxy

8 Fluid Flow Model(Cont’d)

9 Fluid Flow Model

10 Lyapunov Stability Equilibrium : (x1,x2) = (0,0)

11 Lyapunov Stability(Cont’d)

12 Optimal rejection policy P 2,rej = 0 has max value All rejection burden at upstream proxy

13 Stabilizing Algorithm Idetical: P1 >= 1:

14 Stabilizing Algorithm(Cont’d)

15

16 Maximum Withstand-able Overload

17 Conslusion Modeled SIP topology Derive Lyapunov stability condition Proposed a simple overload control algorithm Optimal rejection policy


Download ppt "IEEE ICC 2012 - COMMUNICATION QOS, RELIABILITY AND MODELING SYMPOSIUM ARTHUR: SEYED VAHID AZHARI, HANI NEMATI PRESENTER: 侯宗佑 Stability Analysis of Tandem."

Similar presentations


Ads by Google