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For sensor networks, the extension of operating time by controlling power consumption is an important research subject. In a receiver-driven communication protocol, a receiver node transmits its ID to the sender node periodically, and in response the sender node sends an acknowledgment. The average power consumption of the network can be controlled, but a part of the network shuts down when the battery...
Multiple Access with Salvation Army Protocol (MASA) achieves the higher aggregate throughput than IEEE802.11DCF via packet salvaging at the MAC layer. The implementation of MASA is based on DCF specification. But the back off timer of SACK in MASA is different from that of DATA in DCF. The MASA selects (0, NAV) as the back off range of SACK, whereas DCF thinks the channel is busy in this duration...
For control systems the timely and dependable transmission of sensor data to a controlling instance is a necessary precondition to perform the intended control task. Yet the communication infrastructures used for this purpose usually have to work under difficult circumstances in the field, e.g., wireless networks might be lacking energy to successfully transmit data. In order to guarantee the robustness...
In wireless sensor network research, simulation is one of the most important approaches to evaluate system or protocol performance. The accuracy of estimated results depends on selected simulation parameters. In existing analysis on wireless sensor network, simple interference models are used in simulations, which only take interference signals from nodes in a particular range into account. Based...
Service discovery is one of the most fundamental building blocks of self-organization. While mature approaches exist in the realm of fixed networks, they are not directly applicable in the context of MANETs. We investigate and compare two different protocols as basis for service discovery, namely OLSR and WCPD. OLSR is a proactive routing protocol while WCPD is a path discovery protocol integrating...
Opportunistic routing (OR) schemes, such as ExOR, have been shown to provide significant throughput gains over traditional best-path routing schemes for wireless networks. Though the performance of OR schemes depend on the bit-rate, they currently use a fixed rate for transmitting packets. While several schemes have been proposed for selecting bit-rate for unicast transmission to a single receiver,...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
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