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Designing VoIP Session Management over Interworked WLAN-3G Networks : 

Designing VoIP Session Management over Interworked WLAN-3G Networks Author: KUMUDU S. MUNASINGHE, M. RUBAIYAT KIBRIA, AND ABBAS JAMALIPOUR Source: IEEE Wireless Communications(86-94) • August 2008 Speaker: 976020 Lee Y T Teacher: Hwang Y R

Abstract : 

YZU 2 Abstract Goal Ensuring uninterrupted service continuity WLAN-3G Networks high-data-rate Wireless Local Area Networks Wide coverage third-generation cellular networks VoIP Session Management VoIP session establishment delays Vertical handoff delays Transient packet losses End-to-end delays

Outline : 

YZU 3 Outline Introduction VoIP over interworked WLAN-UMTS Architectural overview VoIP session establishment VoIP session handoff Network modeling Simulation platform Simulation results Noncooperative game-theory-based outage compensation Lossy utility function Payoff function Nash equilibrium selection Conclusion

Introduction : 

YZU 4 Introduction VoIP Voice over IP UMTS Universal Mobile Telecommunications System WLAN Wireless Local Area Networks 3G Third-generation cellular networks

VoIP over interworked WLAN-UMTS : 

YZU 5 VoIP over interworked WLAN-UMTS Architectural overview VoIP session establishment VoIP session handoff

Architectural overview : 

YZU 6 Architectural overview WLAN-UMTS interworking platform coupled at GGSN of UMTS core network connect to the GGSN Via a SGSN emulator connect the WLAN as a separate RNC MH gets routed via SGSN & GGSN to its destination end-to-end data flow bypasses the IMS network session control signaling A B C

Architectural overview : 

YZU 7 Architectural overview WLAN-UMTS interworking platform signaling messages from the MH are routed via the CSCFs of the IMS request is always sent to the S-CSCF of the home network via the P-CSCF of the visiting network exchange of IMS-SIP signaling SGSN & GGSN act as routers D E E

VoIP session establishment : 

YZU 8 VoIP session establishment establishing a 3GPP-IMS controlled data session MH perform a service registration function to update the IMS on its current location Service registration and activation of the PDP context

VoIP session establishment : 

YZU 9 VoIP session establishment Message sequence for negotiating a VoIP session managed by the 3GPP IMS A B C D E F G Establishment

VoIP session handoff : 

YZU 10 VoIP session handoff SIP REFER-based session handoff process A B C D handoff

VoIP session handoff : 

YZU 11 VoIP session handoff Provided information in the replace header does not match any existing session Triggered INVITE does not replace the initial session & is processed normally Failed session handoff attempt cannot destroy the initial session

Network modeling : 

YZU 12 Network modeling Simulation platform Simulation results Noncooperative game-theory-based outage compensation Lossy utility function Payoff function Nash equilibrium selection

Simulation platform : 

YZU 13 Simulation platform Constructed simulation scenario Simple WLAN is connected via an SGSN emulator to the GGSN of the visiting UMTS network PCSCF(WLAN) can be seen as a SIP B2BUA CN which is a SIP UAC, is connected to a destination IP network via a public IP backbone

Simulation platform : 

YZU 14 Simulation platform Voice codec used for voice traffic generation G.711 (64kb/s) G.726 (32kb/s) GSM (13kb/s) G.729 (8kb/s) G.723.1 (5.3kb/s) G.723.1, GSM, G.729 currently the most widely used in GPRS and UMT systems

Simulation platform : 

YZU 15 Simulation platform Header Fixed IP header (40bytes) 12-byte RTP header 8-byte UDP header 20-byte IP header Additional overhead of 34 bytes IEEE 802.11 MAX layer & UTRAN is used minimum overhead of 6 bytes No header compression option at UTRAN PDCP layer

Simulation results : 

YZU 16 Simulation results Transient packet loss scenarios WLAN-to-UMTS & UMTS-to-WLAN handoff over different codecs

Simulation results : 

YZU 17 Simulation results Dependent on the end-to-end VoIP signaling and data paths the codec the payload size of the packet

Noncooperative game-theory-based outage compensation : 

YZU 18 Noncooperative game-theory-based outage compensation Classic example Prisoner’s Dilemma

Lossy utility function : 

YZU 19 Lossy utility function Lossy utility function of the flat rate service profile

Payoff function : 

YZU 20 Payoff function Proposed game theory can be represented in strategic form

Nash equilibrium selection : 

YZU 21 Nash equilibrium selection The selection of Nash equilibrium solutions for a flat rate service outage of t = 2 min

Conclusion : 

YZU 22 Conclusion VoIP session management over an interworked WLAN-3G system with the 3GPP’s IMS acting as a coupling arbitrator Promising but very challenging task Novel simulation model Including enhanced IMS signaling

Conclusion : 

YZU 23 Conclusion Substantial impact on performance measures Except end-to-end delay & jitter values Noncooperative game-theory-based compensation mechanism Compliments the interworked framework

Conclusion : 

YZU 24 Conclusion Nash equilibrium solutions derived for individual subscription classes are treated as fair recompense for the outage loss Benefits by changing their strategy

Reference : 

YZU 25 Reference Designing VoIP Session Management over Interworked WLAN-3G Networks Author: KUMUDU S. MUNASINGHE, M. RUBAIYAT KIBRIA, AND ABBAS JAMALIPOUR Source: IEEE Wireless Communications(86-94) • August 2008

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