This paper presents an analysis of several neighbor sensing approaches for the OLSR routing protocol. While several performance studies of OLSR proceed this work, few attention has been paid to the impact of neighbor sensing on the performance of ad hoc routing protocols. The goal of this article is to better understand how neighbor sensing can contribute to packet loss in an OLSR network and thus degrade the overall performance. Three neighbor sensing schemes are compared: the OLSR HELLO messaging protocol, Fast-OLSR and a link-layer feedback scheme that uses information of the 802.11 MAC to determine lost links. To allow more detailed analysis of the events occuring in the network we initially limit our simulation setup to a simple scenario. As a result we are able to seperate the loss of packets into loss due to the neighbor sensing mechanism used and loss due to the impact of neighbor sensing on the other protocol operations. In the second part of this paper we compare the performance of the link-layer feedback scheme to OLSR in a random waypoint scenario.
This paper presents a transparent multi-level routing scheme, named MORHE, that improves the scalability of the OLSR protocol by exploiting the heterogeneous nature of nodes in the network. In our work we try to take an approach that focuses on scenarios where ad hoc technology can be applied, but where we also find nodes in the network with varying capacity. The MORHE protocol makes use of nodes which have a large capacity (e.g. more energy, larger transmission range) to build something that could best be described as an ad hoc infrastructure. Nodes are grouped in clusters that need to be interconnected by specific nodes. This implies that a node no longer needs to know the entire network topology as is the case of the OLSR protocol, but only needs to maintain routes to the nodes inside its own cluster and to the other clusters. Using this approach the signalling overhead -which is one of the main reasons why OLSR is not scalable -is greatly reduced. We also introduce a simple mobility management scheme to allow nodes to roam the different ad hoc clusters.
Achieving QoS (Quality of Service) in Mobile Ad-hoc NETworks (MANET) has been a research topic in the last years. In this paper we describe a QoS reservation mechanism for Routing Ad-hoc Networks. The mechanism is targeted for sources requiring a bandwidth allocation. The mechanism is based on the knowledge of the bandwidth requirements of the neighbors of a node and the interferent nodes in the cover area of each node. We describe as the protocol could be integrated in AODV and OLSR. We also give simulation results showing the advantages of our reservation scheme.
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