TCP Performance Optimizations for Wireless Sensor Networks

Traffic-Adaptive and Link-Quality-Aware Communication in Wireless Sensor Networks

“…Figure 7, DECTED and BCH). Comparing the results of Hamming (7,4), DECTED(16,8) and the BCH-variants with the adaptive approaches, we can conclude that the adaptive FECs achieved astonishingly good results. The three strategies SA-FEC, SHA-FEC and SSRA-FEC outperformed almost every other static and network-wide setting of any of the implemented ECC codes.…”

“…[8] for more details. We take up basic concepts of distributed TCP caching and local retransmissions proposed in [9] [10] and self-developed extensions of the latter, and implement them -in contrast to the studies [9] [10] -in a MAC-layer independent manner into our Caching and Congestion Control (cctrl) module.…”

Improving Congestion Control of TCP for Constrained IoT Networks

“…Hurni et al explored how to optimize TCP performance by examining the effect of distributed caching and local retransmission strategies where each intermediate node caches TCP segments and retransmits a segment whose ACK (acknowledgement) is considerably delayed, based on RTT estimation [ 14 ]. They integrated their implementation named the caching and congestion control (cctrl) module into the uIP stack of Contiki OS and tested it using different radio duty cycling MAC (medium access control) protocols in a real testbed comprising seven TelosB motes.…”

“…Figure 2 b shows that, when ContikiMAC is used, RTT fluctuates and many retransmissions occur. In terms of the relation between ContikiMAC and the hidden problem, Hurni et al stated that, since ContikiMAC lacks preamble strobes in advance of frames, it may more often cause the hidden node problem [ 14 ]. In grid topologies, the hidden terminal problem gets more prevalent, which explains why many retransmissions occur when ContikiMAC is used.…”

“…Radio duty cycling (RDC) is a major tool which is considered to save battery power in wireless sensor networks. However, despite a number of prior works on TCP for wireless sensor networks [ 10 , 13 , 14 , 15 , 16 ], few studies considered RDC. TCP is required to work well regardless of whether an RDC mechanism runs underneath.…”