Multihop Wireless Networks: Opportunistic Routing


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Description

As WSN topologies commonly possess many more links than those of a minimally spanning tree cf. Figure 1a and 1b , this inherent diversity should be exploited when sending data from the sensor nodes over multiple hops to the sink.

Multihop Wireless Networks: Opportunistic Routing

A low-overhead coordination protocol is, however, needed for the actual receivers of a packet to agree upon which of them should further forward it. Although the problem of choosing the optimal forwarding set and that of receiver coordination are often treated disjointly, they are indeed related, as a larger set of forwarders will most-likely incur a higher coordination cost.

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We are currently investigating possible improvements of an integrated solution in three areas:. Figure 1: Prototypical topology of a wireless sensor network a , together with the possible layout of a routing tree b.

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Major Publications:. Barrenetxea, F.

Ingelrest, G. Schaefer, M.

Introduction

Vetterli, O. Couach and M.

Schaefer and M. Skip to content.


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Moreover, as such networks are often deployed in hostile or remote areas, replacing batteries may be infeasible. WSNs commonly follow a data gathering paradigm, in which all collected data is forwarded to a sink.

The sink may then store the data for later retrieval, perform further computation on it, or relay it directly to a server for archiving and analysis. For the current version of SensorScope , in order to avoid load-balancing problems and the maintenance of a routing tree, such as the one illustrated in Figure 1b, we have decided to let nodes choose their next hop from a self-determined set of possible relays each time a packet has to be sent.

On throughput efficiency of geographic opportunistic routing in multihop wireless networks

The choice is made at random, favoring, however, better neighbors from an estimated link quality point of view. While this scheme, named EPFLnet routing, guarantees that all data messages will eventually reach the sink and may also result in alleviated load-balancing, it is certainly not energy-optimal.

In fact, in most wireless networks with unreliable links, the probability of a packet being successfully received by at least one node in a set of neighbors is greater than the probability of one specific node receiving it. This observation motivates the idea of opportunistic routing OR.

CAREER: Opportunistic Routing in Multihop and Multirate Wireless Networks - Wenjing Lou

In OR, the next-hop routing decision is finalized only after a packet has been sent, allowing the network to opportunistically take advantage of its broadcast nature and outcomes that are inherently random and unpredictable. As WSN topologies commonly possess many more links than those of a minimally spanning tree cf.

Figure 1a and 1b , this inherent diversity should be exploited when sending data from the sensor nodes over multiple hops to the sink. A low-overhead coordination protocol is, however, needed for the actual receivers of a packet to agree upon which of them should further forward it. Although the problem of choosing the optimal forwarding set and that of receiver coordination are often treated disjointly, they are indeed related, as a larger set of forwarders will most-likely incur a higher coordination cost.

We are currently investigating possible improvements of an integrated solution in three areas:.

Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing
Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing
Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing
Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing
Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing
Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing
Multihop Wireless Networks: Opportunistic Routing Multihop Wireless Networks: Opportunistic Routing

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