WLAN / 3G Cellular WLAN / 3G Cellular Interworking Interworking
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WLAN / 3G Cellular WLAN / 3G Cellular Interworking Interworking

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    WLAN / 3G Cellular WLAN / 3G Cellular Interworking Interworking WLAN / 3G Cellular WLAN / 3G Cellular Interworking Interworking Presentation Transcript

    • Innovation Breakfast Series – Bell University Laboratories WLAN / 3G Cellular Interworking Centre for Wireless Communications University of Waterloo, Canada Contacts: Bell Mobility, Canada Hai Jiang (hjiang@bbcr.uwaterloo.ca) Jon W. Mark (jwmark@bbcr.uwaterloo.ca) Xuemin (Sherman) Shen (xshen@bbcr.uwaterloo.ca) Minghui Shi (mshi@bbcr.uwaterloo.ca) Wei Song (wsong@bbcr.uwaterloo.ca) Weihua Zhuang (wzhuang@bbcr.uwaterloo.ca) Aladdin Saleh (aladdin.saleh@bell.ca) October 28, 2005 | Bell Mobility
    • Agenda Introduction to Centre for Wireless Communications IEEE 802.11 roaming in WLAN / cellular environment Mutual authentication and key exchange protocols Resource management for QoS support in WLAN / cellular interworking Acknowledgement Innovation Breakfast - WLAN / 3G Cellular Interworking 2
    • Centre for Wireless Communications Centre for Wireless Communications (CWC) at the University of Waterloo was established in 1996 with a donation of one million dollars from Ericsson Communications Canada over a period of five years as seed money Our mission – to develop a world-class telecommunications research facility – to pursue first-rate research, to train highly qualified personnel, and to transfer technology with industry Innovation Breakfast - WLAN / 3G Cellular Interworking 3
    • Research Team Professor Jon W. Mark, Director of CWC Professor Xuemin (Sherman) Shen Professor Weihua Zhuang 4 Postdoctoral fellows 26 PhD students 11 MASc students Dr. Aladdin Saleh, Bell Mobility Mr. Khai Nyuen, Bell Mobility Innovation Breakfast - WLAN / 3G Cellular Interworking 4
    • Objectives To develop efficient resource and secure mobility management algorithms/protocols for a wireless/wired communication network which – achieves flexible and effective utilization of network resources (radio spectrum) – guarantees end-to-end QoS requirements of multimedia traffic, taking into account the characteristics of wireless and mobile links Innovation Breakfast - WLAN / 3G Cellular Interworking 5
    • Research Projects Voice over Mobile IP Packet traffic modeling WLAN / cellular interworking WLAN / WiMAX Wireless Application Protocol (WAP) Wireless transmission control protocol UWB wireless communications Wireless ad hoc and sensor networks Wireless network security Innovation Breakfast - WLAN / 3G Cellular Interworking 6
    • Textbook Jon W. Mark ⋅ Weihua Zhuang University of Waterloo Publisher: Prentice Hall Copyright 2003 Format: Cloth; 368 pp Published: 2003 Innovation Breakfast - WLAN / 3G Cellular Interworking 7
    • Research Progress for BUL Projects IEEE 802.11 roaming in WLAN / cellular environment Mutual authentication and key exchange protocols Resource management for QoS support in WLAN / cellular interworking Innovation Breakfast - WLAN / 3G Cellular Interworking 8
    • Innovation Breakfast by Bell University Laboratories IEEE 802.11 Roaming in WLAN/3G Environment M. Shi, L. Xu, X. Shen, J.W. Mark, and A. Saleh, Air Interface Switching and Performance Analysis for Fast Vertical Handoff in Cellular Network and WLAN Interworking, International Journal of Wireless Communications and Mobile Computing, 2005 M. Shi, X. Shen, and J.W. Mark, and A. Saleh, Location Management and Vertical Handoff in WLAN/Cellular Integrated Networks, Proc. Global Mobile Congress, pp. 111-116, 2004 L. Xu, X. Shen, J.W. Mark, and A. Saleh, Mobile IP Based Seamless Vertical Handoff for Interworking WLAN and CDMA2000 Cellular Networks, Proc. Global Mobile Congress, pp. 12-17, 2004
    • WLAN / 3G Interworking IP network Innovation Breakfast - IEEE 802.11 Roaming in WLAN/3G Environment 10
    • Objective Design WLAN roaming architecture and signaling process based on AAA (authentication, authorization and accounting) mechanism satisfying – smooth transition – compatibility Innovation Breakfast - IEEE 802.11 Roaming in WLAN/3G Environment 11
    • WLAN Roaming Architecture NAS (Network Access Server) blocks network access until user is authenticated NAS collects user credential AAA broker (AAAB) relays user credential and Mobile IP registration Signaling mode: interactive | seamless Innovation Breakfast - IEEE 802.11 Roaming in WLAN/3G Environment 12
    • WLAN Roaming Signaling Interactive mode – Transition stage – NAS blocks Mobile IP registration request – User are prompted to enter the credential manually – NAS verifies the credential with home network – NAS releases Mobile IP registration packets and completes registration Seamless mode – Final stage – NAS does not block the network traffic at the beginning – NAS forwards Mobile IP registration request together with the challenge/response from mobile terminal to home network – NAS blocks the data traffic from mobile terminal if unsuccessful result is returned Innovation Breakfast - IEEE 802.11 Roaming in WLAN/3G Environment 13
    • Innovation Breakfast by Bell University Laboratories Mutual Authentication and Key Exchange Protocols for Roaming Services
    • Motivation Simple solution for implementation on mobile terminals Existing self-encryption protocol – KMH = f (IDM ) Identity Secret one way function Shared secret key – identity disclosure – not secure due to secret algorithm Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 15
    • Objective Design secure protocols for roaming services – mutual authentication and implicit key exchange – session key freshness assurance – sealed real identity – additional requirements for mobile terminal implementation • light computation requirement on mobile terminal • minimized number of message exchanges Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 16
    • Proposed Protocols Functions of the protocols – mutual authentication | key exchange | key renewal – with anonymity property Two sets of protocols are proposed Protocol I: Secret splitting Protocol II: Self-certified Comp. complexity Lower Higher (one exp. op.) Require pre-setup KMH? No Yes Security strength Lower Higher Application Lower-end device Higher-end device Parties in proposed protocols – M: mobile terminal – H: home network – V: visited (foreign) network Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 17
    • Protocol I: Secret-splitting Principle Based Mutual authentication and key exchange phase M uses Pseudo Identity (PID) in all communications Identity PID + RND Secret key shared between M and H: f '( IDM ) Public one way function Session Key RND by M + RND by V session key Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 18
    • Protocol I: Secret-splitting Principle Based (cont.) Session key renewal phase session key new RND by M M new session key V new RND by V Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 19
    • Protocol II: Self-certified Based Mutual authentication phase M uses Temporary Identity (TID) in all communications KeyMH IDM RND g r_V, g r_M g r_M H V M witness for V and M witness for M KeyHV KeyMH Witness issued by H contains g r_V or g r_M Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 20
    • Protocol II: Self-certified Based (cont.) Session key acquiring and renewal phase witnessM, g t_M g r_V M V witnessV, g t_V r_M, t_M r_V, t_V g(r_V x t_M + r_M x t_V) session key Repeat the process for session key renewal Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 21
    • Sample Results Performance Metrics Self-encryption Protocol I Protocol II Exponential M N/A N/A 1+2 Pre-computed operation Hash operation M 1 N/A 1 Symmetric M 2 2 1 Encryption Symmetric M 1 1 1 Decryption Transmissions M↔V 3 3 2 Anonymity N/A Yes Yes Innovation Breakfast - Mutual Authentication and Key Exchange Protocols 22
    • Summary AAA architecture and registration signaling process for IEEE802.11 roaming in WLAN / cellular environment – smooth transition for implementation Two novel mutual authentication and key exchange protocols for roaming service – identity anonymity: protect mobile user’s privacy – key renewal: reduce risk of compromised communications – equivalent complexity as referenced protocol with significant security enhancement Innovation Breakfast - WLAN / 3G Cellular Interworking 23
    • Further Work Propose integration service model for independently owned cellular and WLAN networks Develop analytical framework for QoS performance concurrent connections over multi-mode radio interfaces Develop corresponding AAA architecture for multi- homing over multiple radio interfaces Innovation Breakfast - WLAN / 3G Cellular Interworking 24
    • Innovation Breakfast by Bell University Laboratories Resource Management for QoS Support in WLAN / Cellular Interworking W. Song, W. Zhuang, and A. Saleh, Interworking of 3G cellular Networks and wireless LANs, International Journal of Wireless and Mobile Computing, 2005
    • WLAN / Cellular Interworking Complementary characteristics of cellular networks and WLANs – Coverage – Implementation cost Radio resource management – Effectively combines the strengths of both networks to provide high-quality services – Efficiently allocates the overall resources for QoS provisioning to multiple services Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 26
    • Research Challenges Heterogeneous networking environment – Capacity – QoS support – Traffic density – Mobility Research objective – Admission strategy to maximize resource utilization with QoS Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 27
    • Admission Control Cell Cell WLAN A D B C WLAN Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 28
    • Admission Strategy Try WLAN first whenever it is available Admission criteria in WLAN – Voice capacity Nvmax: maximum number of voice calls that can be accommodated – Traditional method: allow Nvmax in WLAN – Our method: apply admission region for voice: Nv < Nvmax Overflow to cellular if rejected by WLAN Blocked if rejected by both QoS indication: bounded blocking probabilities Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 29
    • Numerical Results 2.6 2.4 Data capacity 2.2 2 1.8 1.6 1.4 0 3 6 9 12 15 18 21 24 27 Admission region of voice in WLAN Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 30
    • Summary WLAN is always tried first for cost efficiency Maximum number of voice calls admitted in a WLAN is less than the WLAN capacity for voice service Maximum number of data calls admitted in a WLAN should also be restricted Optimal configuration can be found numerically Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 31
    • Further Work Effect of handoff latency Video applications Load balancing inside the WLAN Innovation Breakfast - Resource Management for QoS Support in WLAN / Cellular Interworking 32
    • Acknowledgement Funding from BUL program has – provided upgrades to our existing laboratory – allowed us to access government matching programs such as NSERC Collaborative Research and Development (CRD) Grant, Canada Foundation for Innovation (CFI), Ontario Graduate Scholarship (OGS) – attracted high quality students and researchers The BUL program also incorporates industrial relevance into our research programs We highly appreciate the full support from Vanessa Vogwill, Vic DiCiccio, Jean Webster, and researchers from Bell Mobility Innovation Breakfast - WLAN / 3G Cellular Interworking 33