Mechanisms And Algorithms For Mobility Management And Quality Of Service Guarantee All-IP Based Mobile Wireless Networks

With the fast development and widely deployment of IP and mobile wireless networking technologies, Internet will be integrated with various mobile wireless access networks in the form of all-IP mobile wireless Internet. On the other hand, more and more applications such as video conferences, multimedia streamings will be expected in all-IP basedmobile wireless networks. However, due to mobility, fluctuant wireelss links and IP connectionless characteristics, it poses many difficulties to provide end-to-end quality-of-service (QoS) guarantee for real-time multimedias widely used in all-IP based mobile wireless networks. So, it is of great importance to study mechanisms and algorithms for mobility management and QoS guarantee in all-IP based mobile wireless networks.Aiming at providing QoS-guaranteed multimedia services in next generation mobile wireless networks, this thesis focused on mechanisms and algorithms for mobility management and QoS guarantee from medium access control (MAC) layer, network layer and control plane in all-IP based mobile wireless networks. The main contributions of this thesis are as follows.1) To provide ubiquitous services and the same real-time services as those available on the wired networks for mobile users, an efficient and intelligent QoS-aware mobility scheme, coined dynamic pointer forwarding and probabilistic reservation (DPFPR) scheme is proposed under mobility scenario in future all-IP wireless networks. Firstly, the proposed scheme models the mobile behavior of a mobile node (MN) as a Markov process, and resources are probabilistically reserved according to MN's sojourn time in a subnet domain during a session. Secondly, in order to overcome deficiencies in conventional pointer forwarding scheme, we develop a new decision criterion for performing forwarding chain update, which achieves a better trade-off between network resource consumed by routing path and signaling load for forwarding chain updates. Based on the performance analyses, our proposed scheme can substantially reduce more resource reservation than the conventional pointer forwarding scheme, thus it can achieve efficient resource utilization and guarantee QoS requirements of multimedia applications widely used in the future wireless all-IP networks.2) Seriously examining the QoS provisiong schemes in IEEE 802.16d/e-based BWA networks, we propose a QoS-aware architecture for IEEE 802.16 MAC. Particularly, in order to provide seamless QoS-guaranteed services for IEEE 802.16e-based mobile BWA networks (MBWANs), a QoS-adaptive admission control with resource management, which is undefined in IEEE 802.16d/e standard, is developed. Based on the different types of scheduling service in IEEE 802.16e standard, the proposed scheme classifies them into different connections according to handoff-related parameters and uses different bandwidth reservation strategies to guarantee their connection-level QoS. Particularly, for handoff connections, the proposed scheme takes advantages of dynamic guaranteed channel reservation scheme and adaptive bandwidth management to admit more new incoming connections while the QoS guarantee of the existing connections is not greatly degraded. Finally, the simulation results show that our admission control can achieve better performance in terms of CBP and CDP for the IEEE 802.16e-based MBWANs.3) In order to provide end-to-end QoS-guranteed commnunication between IEEE 802.16e-based MBWANs and Internet, an integrated QoS-aware mobility architecture to achieve the end-to-end QoS guarantee for IEEE 802.16e-based mobile broadband wireless access (BWA) networks is proposed. On the one hand, based on the mobility approach combining both Dynamic RSVP (DRSVP) and crossover router (CR) designed by us, the proposed architecture provides a cross-layer mobility management scheme with the macro diversity handover (MDHO) and Fast BS switching (FBSS) supported by IEEE 802.16e. By obtaining signal strength reports and movement detection information from lower layer in advance, the architecture can make better preparation for a seamless handover on the network layer, so that the packet loss is eliminated and the handover latency is reduced. On the other hand, the architecture further reduces the signaling message overhead and handover delay by mapping three DRSVP services to the five MAC services of IEEE 802.16e, then facilitates providing the end-to-end QoS-guaranteed services for IEEE 802.16e-based mobile BWA networks.4) Based on the analyses of the exsiting handover schemes among heterogeneous networks, we show unsolved problems in these schemes. Moreover, vertical handoff between WMAN and WLAN is seriously examined to achieve seamless mobility between WMAN and WLAN.