Handover mechanisms in next generation heterogeneous wireless ...

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DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING The mobile user that is involved in the NTC retrieval and distribution may work in two different operation modes: Active Operation Mode (AOM) or Power Save Mode (PSM). The former refers to as the state of a mobile terminal that carries an active connection. The latter denotes the state, in which a mobile terminal’s transmit and receive (RxTx) activities are reduced to save energy consumption. Accordingly, two NTC retrieving implementation methods corresponding to the two different operation modes were proposed. The proposed schemes are expected to be applied for different application scenarios rather than a contender to each other. 4.4.1 Active Operation Mode NTC Mobile users working in active operation mode can get involved in the NTC retrieval and distribution process when performing handover. In this thesis, this process is referred to as the Active Operation Mode NTC (AOMN). Network operator can define its own policies to specify how its NTC data with a certain network should be updated as its subscribers roam to that network. In this case, the network operator reactively triggers the NTC process when its AAA servers are processing handover requests. Apart from initiating the NTC process reactively along with a handover, the network operator can select and request its subscribers to perform handover for triggering the NTC process actively. For example, a network operator may instruct one of its subscribers carrying low priority services, e.g. web browsing, to switch to another network so as to collect and distribute the NTC data. The AOMN process can be called either when no NTC data for an area is available or the NTC data for that area has expired. Instead of selecting a network based on the rule of “always best connected” [34], the mobile users being selected for making the AOMN would sacrifice their QoS to discover the neighbour’s trust pattern. The AOMN process is quite similar to a standard handover except having two additional NTC distribution steps as shown in Figure 4.4. The signalling cost of the AOMN consists of two parts: 1) the signalling cost related to a mobile’s standard handover, which results in the NTC data retrieved. 2) the signalling cost related to the NTC distribution following a handover. The parameters to be used to represent each procedure are shown in Figure 4.2. - 64 -
DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING C mf : the cost of AAA signalling incurred between the Mobile Host (MH) and the Foreign AAA (FAAA); C nb : the cost of AAA signalling incurred between the nPOA FAAA and its associated AAA broker entry; C bh : the cost of AAA signalling incurred between the Home AAA (HAAA) and its associated AAA broker entry; C ob : the cost of AAA signalling incurred between the oPOA FAAA and its associated AAA broker entry; � : the average cost of signalling incurred on each AAA hop across the AAA broker network; a m : the cost of the AAA related processing at the MH’s terminal; a h : the cost of the AAA related processing at the HAAA; According to the re-authentication procedure of Figure 4.2, the handover part signalling cost C H of the NTC retrieval can be represented as: in which C H � 5 � C mf � 4 � C nb � 4 � Cbh � a m � 2 � ah � 4� � h (Equation 4.2) nb hnb �i� represents the trust association hops that the AAA message originated from the nPOA traverses on the AAA broker network in handover. It is assumes that the signalling overheads for the AAA message’s transmission between the nPOA FAAA and its associated broker, and its transmission between the HAAA and its associated broker, are the same as what is required for transmitting AAA message between two AAA brokers. Thus, when C C � � , the handover part signalling cost C H can be simplified as: H mf fb � bh �2�hnb �i��amah C � 5 � C � 4� � � 2 (Equation 4.3) - 65 - �i�
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Handover Mechanisms in Next Generat
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ACKNOWLEDGMENT First of all, I woul
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TABLE OF CONTENTS 4.4.2 Power Save
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LIST OF FIGURES LIST OF FIGURES Fig
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LIST OF FIGURES Figure 7.2 A generi
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ABSTRACT New access technologies su
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Chapter 1 INTRODUCTION New access t
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INTRODUCTION becomes available. Han
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INTRODUCTION The above multipliciti
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INTRODUCTION network trust pattern
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INTRODUCTION 1.3 Related Publicatio
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INTRODUCTION TECHNICAL REPORTS XIII
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Page 27 and 28: HANDOVER MANAGEMENT The objective o
Page 29 and 30: HANDOVER MANAGEMENT air interface,
Page 31 and 32: HANDOVER MANAGEMENT proposed archit
Page 33 and 34: HANDOVER MANAGEMENT Access point (A
Page 35 and 36: HANDOVER MANAGEMENT users. Moreover
Page 37 and 38: HANDOVER MANAGEMENT For IEEE 802.11
Page 39 and 40: HANDOVER MANAGEMENT The two schemes
Page 41 and 42: HANDOVER MANAGEMENT When a MH is mo
Page 43 and 44: 3.1 Introduction Chapter 3 HANDOVER
Page 45 and 46: SECURITY FOR HANDOVER ACROSS HETERO
Page 69 and 70: DYNAMIC NEIGHBOUR TRUST INFORMATION
Page 75: DYNAMIC NEIGHBOUR TRUST INFORMATION
Page 93 and 94: Chapter 5 TRUST ASSISTED HANDOVER A
Page 95 and 96: TRUST ASSISTED HANDOVER ALGORITHM F
Page 123 and 124: Chapter 6 PROXY BASED AUTHENTICATIO
Page 125 and 126: PROXY BASED AUTHENTICATION LOCALISA
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PROXY BASED AUTHENTICATION LOCALISA
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MULTI-INTERFACE MOBILE MODEL FOR ME
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CONCLUSIONS AND FUTURE RESEARCH WOR
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ABBREVIATIONS 3G 3rd Generation Wir
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ABBREVIATIONS LS Location Server MH
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ABBREVIATIONS THOA Trust Assisted H
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REFERENCES [12] C. Politis, T. Oda,
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REFERENCES [37] Wi-Fi Alliance, "Wi
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REFERENCES presented at IEEE Intern
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REFERENCES [90] R. Verdone and A. Z
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REFERENCES [116] K. E. Malki and H.
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