Company LOGOInterworked WiMAX-3G Cellular Data Networks:

An Architecture for Mobility Management andPerformance Evaluation

指導教授： 童曉儒 教授學生：許益晨

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 8, NO. 4, APRIL 2009

Kumudu S. Munasinghe, Student Member, IEEE, and Abbas Jamalipour, Fellow, IEEE

OutlineIntroductionIMS Based Session ManagementWiMAX-3G Cellular InterworkingPerformance ModelingNumerical Results and AnalysisConclusions and Future Work

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IntroductionMobile WiMAX networks are still in its infancy with

many technical challenges lying ahead. The lack of an infrastructure for the WiMAX Core Network (CN).

If mobile WiMAX is interworked with the already well established 3G cellular networks, that it may become an essential partner of the future 4G networks.

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IntroductionMobile IP (MIP) has been exploited as the mobility

management mechanism in most of these designs.

The primary focus of this paper is to introduce novel architecture and investigate various performance measures such as vertical handoff delay transient packet loss jitter signaling cost relating to vertical handoff management.

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IMS Based Session ManagementThe IP Multimedia Subsystem (IMS) is an

architectural framework for delivering Internet Protocol (IP) multimedia services.

The user can connect to an IMS network in various ways, most of which use the standard Internet Protocol (IP).

When roaming , they can use IP and run Session Initiation Protocol (SIP) user agents

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IMS Based Session Management

使用者設備 (User Equipment)無線網路存取網路 (Radio Access Network核心網路 (Core Network)

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GERAN

UTRAN

UE

MS

SGSN GGSN

HSS/HLR

SIPServer

NTP VoIP Platform

SIP UA

Radio Access Network Core Network PDN or PSTN

802.11 WLAN

802.16WiMAX

AAA Server

Packet Data Gateway (PDG)

IP Multimedia Subsystem (IMS)

Application Servers (ASs)

Game IMPS Download DRM

MS

SS

Call Session Control Functions (CSCFs)

P-CSCF S-CSCF I-CSCF

PSTN Gateway

PSTNsCGW

BGCF

RTP Proxy

CSPSIP

Analyzer

IMS Based Session Management

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Proxy-CSCF (P-CSCF) is a SIP proxy that is the first point of contact for the IMS terminal.

Serving-CSCF (S-CSCF) is the central node of the signalling plane. It uses Diameter Cx and Dx interfaces to the HSS to download and upload user profiles — it has no local storage of the user. All necessary information is loaded from the HSS.

Interrogating-CSCF (I-CSCF) is another SIP function located at the edge of an administrative domain. Its IP address is published in the Domain Name System (DNS) of the domain , so that remote servers can find it, and use it as a forwarding point (e.g. registering) for SIP packets to this domain.

IMS Based Session Management

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WiMAX-3G Cellular Interworking

A. Architectural Considerations

Design will be primarily based on MIPv4 3GPP2’s IMS does not fully support inter-Packet Data

Switching Node(PDSN) mobility for IPv6.

Eliminates the complexity of managing two IP addresses and enables IP mobility management transparently to the layers above.

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WiMAX-3G Cellular Interworking

B. Interworking Architecture

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Performance Modeling

A. Handoff Delay Analysis A standard vertical handoff during mid-session mobility

comprises of:D1 = link layer handoff delay

D2 = movement detection delay

D3 = address allocation delay

D4 = session re-configuration delay

D5 = packet re-transmission delay

D4 = Dw1 + Dw + Lw1 + LwDwl : total delay at the wireless Dw :total delay at the wired linkLwl :latency of the wireless linkLw :latency of the wired link.

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Performance Modeling

A. Handoff Delay Analysis M/M/1 queuing model has been applied to the wireless BS

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Dwl = 1/(μwl − λwl)Dwl = 1/(μCi − λwl) [channel i]

Performance Modeling

A. Handoff Delay Analysis

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Performance Modeling

B. Packet Loss Analysis

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Performance Modeling

C. Signaling Cost Analysis P is the probability that each handoff will occur S is the average size of a signaling message Ha−b is the average number of hops between a and b

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Performance Modeling

C. Signaling Cost AnalysisP1, the session arrival probability for an inter-

network roaming MN between t0 and t2

η is the network mobility rate

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Performance Modeling

C. Signaling Cost Analysis

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Performance Modeling

C. Signaling Cost Analysis

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Numerical Results and Analysis

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Numerical Results and Analysis

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Numerical Results and Analysis

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Numerical Results and Analysis

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Numerical Results and Analysis

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Conclusions and Future Work

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A novel internetworking architecture for WiMAX and 3G Cellular networks and a detailed evaluation on its performance was presented.

Future works will concentrate on developing a common AAA framework and facilitating multiple network accessing.