Each node is an RT Linux based PC equipped with the Dual Channel PCMCIA card. ⢠Each one implements the full IP/MAC/PHY stack. ⢠Nodes run VoIP (for ...
Enhanced Integrated IP/MAC/PHY Services for Ad hoc Networks Hervé Aïache1, Grégoire Guibé1, Raymond Knopp2, Vania Conan1, Jérémie Leguay1, Christophe Le Martret1, Navid Nikaein
System Architecture
APPLICATIONS & SERVICES VoIP
Video surveillance
Main components: •
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Get Route
The Enhanced 802.11 DLC/MAC/PHY Services that provide reliable communication mechanisms to support synchronized transmission and QoS. It cooperates w ith the other components through the optimized cross layer interface. The Optim ized Link State Routing (OLSR) protocol is the basic routing component; this choice resulted from the analysis of mobility patterns, nodes density and traffic loads.
ROUTING LAYER
Optimized Link State Routing protocol – OLSR – Get Topology & QoS Information
Cluster heads m anage the radio resource w ithin their clusters and are elected by a clustering algorithm selecting the nodes that have the maximum number of neighbors.
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The timing and frequency synchronization is achieved w ith specially designed synchronization sequences periodically broadcasted by the cluster-head.
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Enhanced link quality inform ation in support of the netw ork layer routing protocol.
Ordinary node Relay
The PHY layer provides high bit rate w ireless links using OFDM(A) modulation (802.16x proposals, 3GPP HSDPA) w ith high-order QAM constellations. The netw ork topology is organized (at the MAC layer) in 1-hop clusters.
IP/MAC Integration WIDENS IP Stack for Advanced Ad -Hoc Networks
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Optim ized Link State Routing (OLSR) protocol is used.
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The IP and MAC layers are closely integrated in order to provide not only optimizations to OLSR but also faster reactivity.
Interfaces with Network Layer Components
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Neighborhood information is gathered directly from the MAC layer using a specific cross-layer design.
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This tight interaction betw een routing and MAC is completed by a QoS fram ew ork relying on scheduling at the MAC layer.
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OLSR has been modified to support QoS routing based on metrics reported by the MAC.
Communication Manager Module
Handlers Registration Module
MAC Events Dispatcher Module
Requests Mapping Module
Cross-Layer Interface
MAC Events Receiver Module
Interface with the Dummy Driver
WIDENS Dummy Driver
MAC Event -Based Mode
Demonstration
Request/Response Mode
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Each node is an RT Linux based PC equipped w ith the Dual Channel PCMCIA card.
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Each one implements the full IP/MAC/PHY stack.
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Nodes run VoIP (for audio) and Chat (for data) applications to demonstrate the multi-hop w ireless communications.
would like to acknowledge our partners f rom the WIDENS IST project with whom we hav e worked on the integration of this work to support dif f erent classes of serv ice. 2
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Mote connector: implements the platform-specific driver required to use the ZigBee radio. It provides two low-level services allowing packet transmission and.
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Sec. III introduces the system model as well as the assumptions considered in our work, while Sec. IV formalizes the problem and provides closed-form formula ...
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Routing is a challenge in DTNs (Delay Tolerant Networks). Regular ad- hoc routing protocols fail because the topology suffers from connectivity disruptions.
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