Abstract
saving is considered a significant issue relating to wireless ad hoc and sensor networks, where nodes normally use limited battery power. Transmitting using unnecessary high power introduces excessive interference. It is much better if the network designer would have each node transmit at the lowest possible power while the network connectivity is preserved. This paper introduces the optimal common transmit power, defined as the minimum transmit power used by all nodes necessary to guarantee network connectivity. This is desirable in sensor networks since nodes are relatively simple, while modifying transmit power after deployment is difficult. The optimal transmit power used in this paper has been derived in previous work. It is subject to the specific routing and medium access control (MAC) protocols considered. However, the approach can be additionally extended to other routing and MAC protocols. In this paper, connectivity is defined in terms of a quality of service (QoS) constraint given by the maximum tolerable bit error rate (BER) at the end of a multihop route with an average number of hops.
Highlights
Power conservation is an important issue in an ad hoc wireless network, where nodes are likely to operate on limited battery life
As menti transmitting at excessively high power is ineffective due to mutual interference in the shared radio channel and the limited battery lifetime, it is clear that the optimal transmit power is the minimum power enough to grant network connectivity [1], [2], [3]
The optimal common transmit power has been defined as the minimum transmit power sufficient to preserve network connectivity
Summary
Power conservation is an important issue in an ad hoc wireless network, where nodes are likely to operate on limited battery life. Since performing power control on a link bylink basis is a complicated burdensome task, a simpler more viable solution for implementation is to have all the nodes use a common transmit power. This paper investigates the optimal transmit power for an ad hoc wireless networking scenario, where all nodes use a common transmit power. This paper discusses the BER in more detail, where the optimal transmit power sufficient to maintain network connectivity is found according to a physical layer-oriented QoS constraint given by the maximum tolerable BER at the end of a multihop route with an average number of hops. The paper investigates 1) The impact of different propagation pathloss exponents (on different links of a multihop route) on the performance of a common transmit power control scheme.2) The interrelation among transmit power, connectivity, and network longevity.
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