Recently, emergency-deployed wireless networks have become a topic of great interest. We consider here a dangerous area where rescue teams enter and quickly deploy some monitoring devices, like cameras and sensors, equipped with wireless transceivers and able to send data to a sink that forwards the flows to a control unit where decisions are taken accordingly. Sensors send their data to some coordinator nodes through IEEE802.15.4. Then, both the coordinator nodes and the camera devices compete to access the radio channel assuming a Multi Carrier Code Division Multiple Access (MC-CDMA) air interface is used by the sink. In this paper we study the radio resource assignment problem in the context of such a heterogeneous ad hoc network, composed of IEEE802.15.4 sensor devices, their coordinators, mobile terminals conveying video streams, and sinks. This scenario also fits to the paradigm of opportunistic networks, since the devices deployed by rescue teams are assumed to be able to find some pre-existing sensor network and to use it to get additional data from the environment. In such hierarchical heterogeneous opportunistic network, we focus on cross-layer scheduling of the video and sensor traffics toward the sink. The scheduling strategy we propose takes into account information coming from both physical and application layers. Results show that the proposed cross-layer strategy significantly outperforms the Maximum Throughput scheduling, used as a benchmark, in case of video traffic, while preserving the same performance for 802.15.4 traffic.
Cross-Layer Scheduling over Heterogeneous Opportunistic Emergency-Deployed Wireless Network
TRALLI, Velio;
2009
Abstract
Recently, emergency-deployed wireless networks have become a topic of great interest. We consider here a dangerous area where rescue teams enter and quickly deploy some monitoring devices, like cameras and sensors, equipped with wireless transceivers and able to send data to a sink that forwards the flows to a control unit where decisions are taken accordingly. Sensors send their data to some coordinator nodes through IEEE802.15.4. Then, both the coordinator nodes and the camera devices compete to access the radio channel assuming a Multi Carrier Code Division Multiple Access (MC-CDMA) air interface is used by the sink. In this paper we study the radio resource assignment problem in the context of such a heterogeneous ad hoc network, composed of IEEE802.15.4 sensor devices, their coordinators, mobile terminals conveying video streams, and sinks. This scenario also fits to the paradigm of opportunistic networks, since the devices deployed by rescue teams are assumed to be able to find some pre-existing sensor network and to use it to get additional data from the environment. In such hierarchical heterogeneous opportunistic network, we focus on cross-layer scheduling of the video and sensor traffics toward the sink. The scheduling strategy we propose takes into account information coming from both physical and application layers. Results show that the proposed cross-layer strategy significantly outperforms the Maximum Throughput scheduling, used as a benchmark, in case of video traffic, while preserving the same performance for 802.15.4 traffic.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
