Conference Paper

Experimental Study of the Effects of Tx Power Control and Blacklisting in Wireless Sensor Networks

Dept. of Electr. Eng.-Systems, Southern California Univ., Los Angeles, CA, USA
DOI: 10.1109/SAHCN.2004.1381929 Conference: Sensor and Ad Hoc Communications and Networks, 2004. IEEE SECON 2004. 2004 First Annual IEEE Communications Society Conference on
Source: IEEE Xplore


We experimentally investigate the impact of variable transmission power on link quality, and propose variable power link quality control techniques to enhance the performance of data delivery in wireless sensor networks. This study extends the state of the art in two key respects: first, while there are a number of previous results on power control techniques for wireless ad hoc and sensor networks, to our knowledge, nearly all of them have been simulated and analytically studied that assumes the idealized link conditions; second, while there are several recent experimental studies that have shown the prevalence of non-ideal unreliable communication links in sensor networks, the paper has not thoroughly investigated the impact of variable transmission power. We perform a systematic set of experiments to analyze how the transmission power changes affect the quality of low power RF wireless links between nodes. These experiments show how significant variation in link qualities occur in real-world deployments and how these effects strongly influence the effectiveness of transmission power control. We then present a packet-based transmission power control mechanism that incorporates blacklisting to enhance link reliability while minimizing interference. The effectiveness of the proposed scheme is demonstrated via test bed experiments.

22 Reads
  • Source
    • "Experimental studies in realistic conditions performed in [2], [3], [4], [5], [6] show that communication between WSN nodes could be problematic. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Topology Control Protocols configure transmission power of nodes in order to achieve specific properties to a given topology. These properties include the creation and maintenance of neighborhoods or other topological entities (like trees or clusters), load balancing in terms of connectivity degrees and provision of link symmetry. We see topology control as a two-fold problem where topological properties can also be affected by local network throughput. We propose SCLD-A2TP, a protocol that operates in a two phase adaptive scheme. First transmission power is adaptively adjusted with low throughput settings and nodes achieve a sufficient degree of symmetric and coherent links. Secondly throughput is maximized insofar as the degree is maintained. We assess various distributed heuristics for SCLD-A2TP via test bed experiments and show that up to an extend, link quality and symmetry as well as degree conformity of links can be regulated successfully by transmission power and adaptive throughput control.
    DCOSS, Marina Del Rey, CA, USA; 05/2014
  • Source
    • "Standalone protocols like ATPC (Lin et al., 2006) and PCBL (Son et al., 2004) focus on fixating transmission powers for individual links. PCBL uses a sampling period where Packet Reception Rates (PRR) are correlated with specific transmission power settings for each link. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Wireless Sensor Networks (WSNs) are by nature dynamic and communication between sensors nodes is ad hoc. Numerous protocols and applications proposed operate on the assumption that communication channels are stable. Topology Control Protocols are crucial in the operation of WSNs as they adjust transmission power in order to maintain link quality, minimize interference and provide spatial topological control. Analysis of such protocols is performed using theoretical models that are based on unrealistic assumptions like ideal wireless channels and perfect energy consumption and distance estimations. With these assumptions taken for granted, theoretical models claim various performance milestones that cannot be achieved in realistic conditions. We here present a topology control protocol that is deployable in real WSNs and distance ourselves from spatial, temporal, environmental assumptions regarding the performance of communications on the wireless medium. Our protocol focuses on fault tolerance and symmetric link coherence using an adaptive transmission power scheme. From various testbed experiments we showcase the performance of SCLD-ATP in terms of load balancing, reliability, multi-hop capabilities and power consumption.
    SENSORNETS 2014, Lisbon; 01/2014
  • Source
    • "Under such circumstances parameters such as RSSI or PRR do not give a good indication of whether link quality is poor or more importantly why it is poor (both power transmission and interference can be the cause). For example, if we assume that interference does not exist, higher RSSI reading generally translates into a higher PRR [1]. However, as interference increases, a higher RSSI may not result in a higher PRR, as the increased RSSI may be due to other nodes that are transmitting simultaneously and are within the range of the receiver. "
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper addresses first the problem of max-min fair (MMF) link transmissions in wireless sensor networks (WSNs) and in a second stage studies the joint link scheduling and transmission power assignment problem. Given a set of concurrently transmitting links, the MMF link transmission problem looks for transmission powers of nodes such that the signal-to-interference and noise ratio (SINR) values of active links satisfy max-min fairness property. By guaranteeing a “fair” transmission medium (in terms of SINR), other network requirements may be directly affected, such as the schedule length, the throughput (number of concurrent links in a time slot), and energy savings. Hence, the whole problem seeks to find a feasible schedule and a power assignment scheme such that the schedule length is minimized and the concurrent transmissions have a fair quality in terms of SINR. The focus of this study falls on the transmission power control strategy, which ensures that every node that is transmitting in the network chooses a transmission power that will minimally affect the other concurrent transmissions and, even more, achieves MMF SINR values of concurrent link transmissions. We show that this strategy may have an impact on reducing the network time schedule.
    Journal of Applied Mathematics 01/2014; 2014:1-11. DOI:10.1155/2014/693212 · 0.72 Impact Factor
Show more


22 Reads
Available from