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In recent years, along with the increasing popularity of multi-hop wireless networks, there has been a growing demand in the coupling of these networks to external ones such as the Internet. As traffic destined for external networks increases, special attention is required not only in gateway selection, but also in optimized routing and scheduling in order to maximize the network performance. In this...
In multihop wireless networks, end-to-end throughput is often hard to predict and is even harder to optimize due to the effect of interference. To date there is no precise result other than asymptotic bounds for this question: if there is no routing information given, what is the maximum throughput of a network using uncoordinated transmission such as IEEE 802.11 MAC? This paper attempts to address...
In this paper, we propose a new quality link metric, interference and bandwidth adjusted ETX (IBETX) for wireless multi-hop networks. As MAC layer affects the link performance and consequently the route quality, the metric therefore, tackles the issue by achieving twofold MAC-awareness. Firstly, interference is calculated using cross-layered approach by sending probes to MAC layer. Secondly, the nominal...
We propose a new cross-layer approach to mitigate interference in multihop networks. Precisely, we cancel all adjacent node interference in a multihop path by MIMO two-way relay scheme and jointly optimize the routing and power allocation to mitigate the interference from far nodes. We model and efficiently solve this optimization problem using a geometric programming framework. Our simulation results...
Is the temporal dimension alone sufficient to characterize contacts in opportunistic networks? Several studies analyze the temporal aspect of contacts with significant results concerning contact and inter-contact distributions. Nevertheless, only the temporal dimension does not give a complete overview of contact characterization. In this paper, we propose the surround indicator as a metric to exhibit...
Recent research results have shown that channel width is an important control knob that can be easily adapted through software and can be used for achieving higher system throughput and better energy efficiency. In this paper we address the problem of joint routing and transmission scheduling in a multichannel wireless mesh network with variable-width channel allocation. While narrower bands split...
Fairness and system throughput, influenced by wireless interference, are major objectives of resource allocation in wireless networks. Whereas traditionally max-min fairness protocols have been developed for wired networks (where interference is not a factor for network performance), in this paper we investigate the problem of flow routing and fair bandwidth allocation under the constraints of the...
When designing distributed wireless networks utilizing shared bandwidth, a critical issue is allocating spatial and temporal resources to streaming information flows. We focus on large networks of half-duplex terminals sharing common bandwidth, and study methods for allocating resources on a fine-grained temporal basis, with specific emphasis on managing the interactions between streams of packets...
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...
This paper deals with two fundamental joint routing and scheduling problems in multi-hop wireless mesh networks (WMNs) employing time division multiple access (TDMA). The problems pertain to incremental update of schedules as some of the existing flows terminate and new flow demands are received. In the first problem, referred to as single flow scheduling (SFS) problem, we are given a set of ongoing...
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...
Chains or multi-hop paths are the fundamental communication structure in multi-hop wireless networks. Understanding chain behavior is critical in order to build effective higher layer protocols. This paper examines the problem of how MAC level interactions influence chain behavior in a general multi-hop wireless network where multiple chains coexist. We first classify chains based on the MAC interactions...
Built upon a shared wireless medium, wireless network is particularly vulnerable to jamming attacks. The ability to recover from attacks and maintain an acceptable level of service degradation is a crucial aspect in the design of a wireless network. To address this issue, this paper investigates the network restoration solutions via the joint design of traffic rerouting, channel re-assignment, and...
This paper studies the problem of multicast routing and channel assignment in multi-channel and multi-interface wireless mesh networks. The advantage of the wireless broadcast's nature is used to reduce interference and improve network throughput. The employed network model is first described. Next, a heuristic channel assignment algorithm that makes use of the wireless broadcast's advantage is presented...
Maximizing network throughput is one of the main objectives in wireless multi-hop networks. However, small link bandwidth and severe interference become two great obstacles in network throughput improvement. Single route always encounters great congestion, especially for multiple flows with the same source and destination. Multi-path routing can solve the bandwidth shortage issue to some extent, but...
Recent advances in wireless technology have made it increasingly feasible to equip wireless nodes with multiple radios, thereby allowing each radio to exploit channel diversity in the form of orthogonal, non-overlapping transmission spectrums. Multi-channel operation mitigates interference, but at the same time raises new challenges for network optimization, in terms of judicious channel assignment...
Most WSN routing protocols select route based on hop count. Efficient routing metric should consider both inter-flow and intra-flow interference. A new minimum route-interference routing metric for multi-radio WMN is proposed. The path which has a minimum total interference can be found by using this metric. Simulation result shows that network performance can be significantly improved with the new...
Network topology does not change dynamically in wireless mesh networks. Most of the end-to-end traffic flows are between mesh nodes and gateways. A tree-base routing algorithm is suitable for such network architecture. When using multichannel and multi-interface, routing algorithm and channel assignment is codependent. They should be combined together to fully exploit the network capacity. We propose...
Wireless mesh networks (WMNs) technologies which accede to the advantages of ad hoc networks have received much attention. Transmission power control and routing selections are critical issues in the past researches of ad hoc networks. Variable transmission power levels impact the node connectivity and affect routing selections. Further, different power levels cause different network spatial reusability...
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