Mitigating congestion in wireless sensor networks

Network congestion occurs when offered traffic load exceeds available capacity at any point in a network. In wireless sensor networks, congestion causes overall channel quality to degrade and loss rates to rise, leads to buffer drops and increased delays (as in wired networks), and tends to be grossly unfair toward nodes whose data has to traverse a larger number of radio hops. Congestion control in wired networks is usually done using end-to-end and network-layer mechanisms acting in concert. However, this approach does not solve the problem in wireless networks because concurrent radio transmissions on different “links” interact with and affect each other, and because radio channel quality shows high variability over multiple time-scales. We examine three techniques that span different layers of the traditional protocol stack: hop-by-hop flow control, rate limiting source traffic when transit traffic is present, and a prioritized medium access control (MAC) protocol. We im...

• Type: Conference
• Year: 2004
• Where: SENSYS
• Authors: Bret Hull, Kyle Jamieson, Hari Balakrishnan
• Keywords: Congestion Control, Sensor Networks, SENSYS 2004, Wired Networks, Wireless Sensor Networks