Priority-based Congestion Control in Wireless Sensor Networks

Abstract

In wireless sensor networks (WSNs), congestion occurs, for example, when nodes are densely distributed, and/or the application produces high flow rate near the sink due to the convergent nature of upstream traffic. Congestion may cause packet loss, which in turn lowers throughput and wastes energy. Therefore congestion in WSNs needs to be controlled for high energy-efficiency, to prolong system lifetime, improve fairness, and improve quality of service (QoS) in terms of throughput (or link utilization) and packet loss ratio along with the packet delay. This paper proposes a node priority-based congestion control protocol (PCCP) for wireless sensor networks. In PCCP, node priority index is introduced to reflect the importance of each node. PCCP uses packet interarrival time along with packet service time to measure a parameter defined as congestion degree and furthermore imposes hop-by-hop control based on the measured congestion degree as well as the node priority index. PCCP controls congestion faster and more energy-efficienty than other known techniques.

A Critical Insight into Congestion Control Mechanism in WSN

“…Various approaches has been employed [27,7,18,33,13]. On the other hand, if data load over traffic is distributed through alternative or multiple paths, then resource control methods are employed to control congestion [26,28,12].…”

“…With PCCP, a number of up streams data sources can be find out and able to measure the downstream forwarding rate. It helps to measure congestion accurately by priority index and thus able to achieve high link deployment and flexible fairness at tiny buffer size [33].…”

Probabilistic QOS Aware Congestion Control in Wireless Multimedia Sensor Networks

“…The available bandwidth is fairly allocated among transit traffic flows. Priority-based Congestion Control Protocol (PCCP) [12] [13] uses the ratio between packet service time and packets inter arrival time as an index to detect congestion. It proposes Priority based Rate Adjustment (PRA) to control congestion.…”

Performance evaluation of WSN management system for QoS guarantee

“…The second group, which is related to only congestion control mechanism, contains five transport protocols. These protocols are Congestion Detection and Avoidance (CODA) [22], SenTCP [23], Fusion [24], Congestion Control and Fairness (CCF) [25], and Prioritybased Congestion Control Protocol (PCCP) [26]. All of these protocols do not have any reliability mechanism.…”