Zhiwei Yan

Implementation and analysis of proxy MIPv6

Mobile IPv6 (MIPv6) is a host-based mobility support specification which has been approved by the IETF as the standardized solution of global mobility management in IPv6 network for Mobile Node (MN). However, MIPv6 handover procedure results in a large handover delay. To improve its performance, some MIPv6 variants such as Fast Handover for MIPv6 (FMIPv6) and Hierarchical MIPv6 (HMIPv6) were proposed. However, they all require the MN to support the mobility management protocols which increase the difficulty of management and deployment. Recently, IETF NETLMM workgroup published the Proxy Mobile IPv6 (PMIPv6) which is a network-based localized mobility management to provide the mobility support for mobile host without the involvement of the mobility signaling. In this paper, we analyze the singling cost of PMIPv6 and implement it in our test-bed to evaluate its performance. The results show that the PMIPv6 has lower signaling cost and packet delivery cost, and it can improve the handover performance of UDP and TCP than the other mobility management protocols under low-delay networks, as for the wide area networks, it needs to introduce some mechanism like fast handover to further improve its performance. Copyright

Network mobility support in PMIPv6 network

In this paper, we propose a network mobility supporting scheme (N-NEMO) in Proxy Mobile IPv6 (PMIPv6) network, which is an issue still up in the air for the PMIPv6. In the N-NEMO, a tunnel splitting scheme is used to differentiate the inter-Mobility Access Gateway (MAG) and intra-MAG mobility. The performance analysis and comparison between other related schemes show that N-NEMO reduces the signaling cost significantly. Besides, it enhances the efficiency and scalability to provide the comprehensive network mobility in the PMIPv6 context.

Implementation and analysis of network-based mobility management protocol in WLAN environments

Mobile IPv6 (MIPv6) has been approved by the IETF as the standardized solution for mobility management in IPv6 network. MIPv6 is a host-based mobility support specification, and it can provide the global mobility support for mobile terminal. However, MIPv6 handover procedure results in a long handover delay. To improve the handover performance, some MIPv6 variants such as Fast Handover for MIPv6 (FMIPv6) and Hierarchical MIPv6 (HMIPv6) were proposed. However, they all require the mobile terminal to support the mobility management protocols. Recently, the Proxy Mobile IPv6 (PMIPv6) was proposed in IETF NETLMM workgroup, which is a network-based localized mobility management and it can provide the mobility support for mobile node without an involvement in the mobility signaling. The previous work about the performance evaluation of PMIPv6 is mainly based on the analysis and lacks of evaluation in a real system. So, in this paper, we study the PMIPv6 and implement it in the WLAN environments. We set up a test-bed to evaluate its performance and compare it with the other mobility specifications including the MIPv6, FMIPv6 and HMIPv6. The results show that the PMIPv6 can improve the handover performance under low-delay networks, as for the wide are networks, it needs to introduce some mechanism like fast handover needs to further improve its performance.

Speed-Based Probability-Driven Seamless Handover Scheme between WLAN and UMTS

The next generation of mobile/wireless communication system is expected to include heterogeneous broadband wireless networks that will coexist and use a common IP core to offer a diverse range of high data rate multimedia services to end users with contemporary mobile devices. The mobile devices will be equipped with multiple network interfaces since the networks have characteristics that complement each other. This requires the provision of seamless vertical handover. In this paper, a probability driven handover scheme which uses the mobiles speed (SPHO) is developed to support seamless and adaptive handover management between WLAN and UMTS. Extensive simulation experiments show that this scheme effectively achieves seamless handover between heterogeneous networks and guarantees quality of communication during handover.

A novel mobility management mechanism based on an efficient Locator/ID separation scheme

The challenge to provide seamless mobility in the near future emerges as a key topic in various standardization bodies. In this paper, on the basis of an efficient and scalable Locator/ID separation (LIDS) architecture, a mobility management mechanism is designed. There are two contributions of our solution. Firstly, we separate the access network from the core network. Besides, to provide the seamless mobility support, locator/ID separation is used which can provide transparency to the upper layer applications. Then, the performance analysis is presented for both horizontal and vertical handover scenarios. The results show that our LIDS based architecture provides an outstanding network-based mobility management with route optimization support compared with the IP based approaches Mobile IPv6 and Proxy Mobile IPv6).

An adaptive multi-criteria vertical handover framework for heterogeneous networks

Future wireless Internet is expected to consist of various heterogeneous wireless access networks with different properties to support different type of services. In order to improve the accuracy of the vertical handover decision for such heterogeneous networks, this paper proposes an adaptive multi-criteria vertical handover framework. This framework focuses on several main aspects of a vertical handover. It is able to trigger a handover intelligently and make a handover decision effectively and adaptively.

A dual threshold-based fast vertical handover scheme with authentication support

Vertical handover refers to the process that the interface connecting to wireless network changes across heterogeneous networks. The delay caused by vertical handover affects the quality of the ongoing applications, especially the real-time applications like VoIP. Authentication and security association is one of the major components of delay during vertical handover. If the Mobile Node(MN) uses stateless address configuration scheme during handover, it is another time consuming phase. In this paper, we propose a dual threshold based handover scheme, which uses the Media Independent Handover (MIH) services defined in the IEEE 802.21 to provide fast vertical handover with authentication support.

GBC-based caching function group selection algorithm for SINET

The emerging future network designs such as Smart Identifier Network (SINET) and Information-Centric Networking (ICN) can provide efficient content delivery via its in-path caching. However, it is not an optimal way to cache contents at all intermediate routers for that current technology is not yet ready to support an Internet scale deployment. Most of the existing works select cache location based on the important of single node rather than that of entire cache group, which may result in inefficient problem caused by reduplicative impertinences. In this work, we study the intelligent cache location selection algorithm with an objective to maximize cache delivery performance while minimize the number of caching nodes. We first investigate the recent work in term of content location selection schemes, and formulate this problem as finding the prominent group with the highest Group Betweenness Centrality (GBC). We then propose a GBC-based in-path caching function group selection algorithm to select the caching nodes in SINET. We evaluate the performance of proposed algorithm through simulations and compare it with others. The final results show that GBC-based algorithm can provide better performance in term of average hop of content delivery. Using our finding, the network operators could deploy cache easily.

Design and implementation of a hybrid MIPv6/PMIPv6-based mobility management architecture

As two of the most promising candidate solutions for realizing the next-generation all-IP mobile Internet, Mobile IPv6 (MIPv6) is a host-based protocol supporting global mobility, while Proxy Mobile IPv6 (PMIPv6) is a network-based protocol supporting localized mobility. In order to take full advantage of both and enhance the mobility performance, a hybrid MIPv6/PMIPv6-based mobility management architecture is proposed in this paper. First, the optimized coexistence architecture of MIPv6 and PMIPv6 is presented. Based on this architecture, the Hybrid scheme is proposed, in which localized mobility and global mobility are handled by PMIPv6 and MIPv6 respectively to improve the efficiency. Then we propose the Hybrid+ scheme based on the Hybrid scheme. The Hybrid+ scheme incorporates a protocol selection algorithm, which takes into account the mobility characteristics of mobile nodes (MN) and network conditions. This allows it to select the most suitable mobility supporting protocol between the basic MIPv6 and the Hybrid scheme. Performance analysis using a two-layer hierarchical network model reveals that the Hybrid scheme reduces the signaling costs by more than 20% compared to the basic MIPv6 and Hierarchical Mobile IPv6 (HMIPv6). In addition, we have implemented the proposed mobility management architecture in a test-bed. The experimental results show that our Hybrid scheme can improve the handover performance of UDP and TCP sessions over the other mobility management protocols. Moreover, when the protocol selection algorithm is adopted as in the Hybrid+ scheme, the performance can be further improved by more than 50% under various scenarios.

Design and Implementation of PMIPv6 Based Multihoming for Make-Before-Break Handover

Unlike the various existing protocols for IP mobility management such as Mobile IPv6 (MIPv6), Proxy Mobile IPv6 (PMIPv6), which is a network-based approach, has salient features that expedite IP mobility management deployment. However, moving from one access network to another gives rise to a Break-Before-Make handover process that incurs packet losses and service disruption for the Mobile Node (MN) in the basic PMIPv6. Mobility support combined with multihoming is the missing piece in basic PMIPv6. This motivated us to design and analyze the PMIPv6 multihoming based Make-Before-Break handover mechanism and implement it in a real network test-bed. From the experimental results, we show that our approach completely mitigates the consequences of handover latency and packet losses when applied to the basic PMIPv6 protocol.