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Title: Adaptação do mecanismo de controle de congestionamento TFRC do protocolo de transporte DCCP para redes em malha sem fio
Keywords: DCCP;  redes mesh sem fio;  TFRC;  controle de congestionamentos;  DCCP;  wireless mesh networks;  TFRC;  congestion control
Issue Date: 16-Dec-2009
Abstract: This work proposes an adaptation of the TCP-Friendly Rate Control (TFRC) congestion control mechanism used by the Datagram Congestion Control Protocol (DCCP) transport protocol. DCCP is an unreliable transport protocol proposed to replace the use of the UDP transport protocol, mainly for multimedia applications, which are affected by the delay and overhead imposed by the TCP transport protocol. DCCP implements congestion control without increasing delay, avoiding applications with high bandwidth demand from consuming all network resources, which causes degradation in concurrent flows. However, as the TFRC congestion control mechanism was designed for wired networks, it does not perform well in multihop wireless networks (mesh networks). Specifically, IEEE 802.11 MAC layer medium access mechanisms, such as retransmission and exponential backoff, mislead the TFRC congestion control mechanism, resulting in an inaccurate sending rate adjustment. This dissertation shows how the default DCCP TFRC mechanism overloads the MAC layer in multihop wireless mesh networks and proposes a new mechanism, called M-TFRC, whose simulation results in significant performance improvements.
Appears in Collections:TEDE sem arquivo

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