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An analytical model is introduced for the study of the interplay between medium access control (MAC) and packet forwarding disciplines used in multi-hop wireless networks. The model incorporates the likelihood with which nodes access the channel, which is determined by the MAC protocol, and the creation of active portions of the topology, which is given by the packet forwarding discipline. The model...
Efficient routing is a fundamental issue in multi-hop wireless ad hoc networks. In this paper, we study the limitation of traditional routing structure in multi-hop wireless ad hoc networks due to (a) the layered structure of a wireless protocol stack and (b) the lack of coordination between medium access control (MAC) and routing protocols. These limitations result in long processing delays in a...
We consider the problem of cross-layer utility maximization subject to stability constraints for a multi-commodity wireless network where all links are sharing a number of orthogonal channels. We assume a time slotted network, where the channel gains are changing randomly from slot to slot. The optimal cross-layer network control policy can be decomposed into three subproblems: 1) flow control at...
In this paper, we study the joint configuration of routing and medium access control (MAC) parameters in fixed wireless networks. Due to the complexity of the problem, we consider a simple slotted ALOHA MAC protocol for link layer operation. We model the link rate of the slotted ALOHA system under a saturation assumption and use a signal to interference plus noise ratio (SINR) based interference model...
In this paper, we jointly address the scheduling problem such as rate control, medium access control (MAC) and routing for cooperative vehicular ad-hoc networks (VANETs) in the framework of cross-layer design. Compared to its counterpart in a wired network where link capacities are assumed to be fixed, congestion control in a multi-hop cooperative VANETs is much more complex and requires joint optimization...
In wireless multi-hop networks, the allocation of resources is influenced by mechanisms for medium access control (MAC), routing, congestion control, and flow control. Designing these mechanisms jointly can increase the capacity of wireless networks. We attempt to introduce routing into an existing framework for the joint design of flow control and MAC on random access multi-hop wireless networks...
Multi-radio wireless mesh networks (WMN) is a feasible choice for several applications, as routers with multiple network interface cards (NICs) have become cheaper. Placement of multiple NICs on each router can significantly improve the network performance if channels are assigned wisely. This is due to the fact, that by using multiple non-interfering channels wireless interference is diminished....
This paper extends the existing static framework for joint flow control, routing and medium access control (MAC) in random access multi-hop wireless networks in to a dynamic framework where link capacities vary over time. The overall problem is formulated as a long term network utility maximization (NUM) problem (instead of the existing static NUM problem) that accounts for link capacity variation...
This paper presents a framework of wireless multi-hop networks exploiting an ad hoc routing protocol working on the layer 2.5, called REAL (reputation based approach on 2.5-Layer) routing protocol. The framework of REAL routing protocol incorporates following three things: a new concept of wireless multi-hop network architecture, a new 2.5-layer routing technique with a reputation management scheme,...
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