Figure 7 - uploaded by Ante Prodan
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A simple overview of a Multi-Radio Wireless Mesh Network Each of the mesh nodes i.e. mesh routers which also have an access point functionality is termed as the mesh access point and its internal structure is shown in Fig. 8. The mesh access point node essentially multi-hops the traffic to and fro between the access networks and the wired Internet.
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![Figure 5: HMIPv6 Overview-adapted from [11]. Direction of movement](profile/Ante-Prodan/publication/226034705/figure/fig4/AS:667708962111495@1536205630609/HMIPv6-Overview-adapted-from-11-Direction-of-movement_Q320.jpg)
A viable support of an on-going or a new session for a subscriber on the move requires an effective scheme for Mobility Management. To this end, an array of protocols such as MIPv4, MIPv6, HMIPv6, FMIPv6 have been proposed for the wired Internet. Unfortunately,
the wireless connectivity in the wireless mesh networks (WMNs) gives rise to several iss...
Contexts in source publication
Context 1
... objective of our proposed mobility management scheme is to offer a seamless handoff to the mobile client in a multi-radio wireless mesh network (MR-WMN), which was shown in Fig. 7. The mobility management aspects that we have dealt with herein are related to the mechanism for handover and location management. Our work currently is not concerned with the schemes to maintain the QoS and carry out an effective routing during the handoff process. So these are not discussed in the ...
Context 2
... MR-WMN will be linked to the backbone Internet by means of one or more root nodes, which in the mesh networking terminology are known as the mesh portal nodes (refer Fig. 7). In accordance with [21] the mesh portal is a prime candidate for taking on the role of the mobility anchor point (MAP). However, we argue that having MAPs only co-located with the mesh portal nodes may not make an efficient use of the limited wireless bandwidth connectivity. For example, consider the case where the correspondent node ...
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Citations
... These two scenarios are very representative, since Ping and TCP traffic present very similar behavior [21]. In the following section, we propose our solution based on the NDP cache, which solves efficiently all the problems seen in this section. ...
... Actually, the clients' wireless card that we used in our tests, sometimes performs a complete scan of wireless channels, which increases the IEEE 802.11 handover latency to approximately 6.9 seconds. In this case we can obtain up to thirty-six seconds of disconnection time even if the detection and the WMRs tables update are practically instantaneous after the physical connection [21]. Fig. 6(b) shows the cumulative distribution of client disconnection time during TCP traffic with a fast IEEE 802.11 handover (i.e. ...
... Note that we use the 64-bit Extended Universal Identifier (EUI-64) to obtain the IP address from a MAC address ([23],[24]). 6 CWIT (Client WIThdraw) is a unicast packet, used by the new WMR to inform the old one for its client's displacement[21]. ...
Despite considerable efforts, mobility management in Wire- less Mesh Networks (WMN) remains an open issue. Several high perfor- mance solutions can be found in the literature, however, they all have the same requirement that refrains them from being widely adopted: they need either modifications or additional modules into the protocol stack of users' equipment. In this paper, we investigate the mobility problem in WMNs and propose a new efficient solution, which does not rely on any modification or additional software on the client side, thus being totally transparent for end-users. In our analysis, we first show the mea- surements performed on the existing WMN deployed in LIP6, namely MeshDVNet, and highlight the reasons of its poor performance. Then, we describe the design of Enhanced Mobility Management (EMM), our pro- posal, which does not need any supplementary installation. EMM takes advantage of the existing Neighbor Discovery Protocol (NDP) cache to keep a track of the last client association and uses this information to trigger an update in order to re-route packets. The measurements we performed show how EMM is able to greatly improve performances.
Wireless Mesh Networks (WMNs) may be broadly classified into two categories: Layer 2 and Layer 3 WMNs. This article focuses on the Layer 3 WMN, which provides the same service interfaces and functionalities to the conventional mobile host (MH) as the conventional wireless local area network. Three essential design issues to realize seamless mobility management in the Layer 3 WMN are identified and systematically discussed in this article. They are IP address resolution, location management, and Media Access Control (MAC) address resolution. The Layer 3 WMN backbone requires systematic management of the IP and MAC addresses of each MH, which can be realized by four basic approaches: centralized management, home management, replication management, and distributed management. It is shown that the address pair management architecture is fundamental to realizing efficient packet forwarding and address resolution. Design guidelines are provided to realize Layer 3 WMN supporting seamless MH roaming, considering the applicability of address pair management architectures with regard to WMN scale and client mobility; this applicability is considered based on a qualitative evaluation of the management overhead and handover performance.
