Impact of IEEE 802.16 ARQ mechanism on the performance of TCP-NewReno Online publication date: Sat, 11-Oct-2014
by K. Sakthi Mala; P. Navaneethan
International Journal of Wireless and Mobile Computing (IJWMC), Vol. 6, No. 2, 2013
Abstract: IEEE 802.16 supports Automatic Repeat request (ARQ) at the link layer to provide reliable service. ARQ retries sending a data-unit until the transmission is successful or maximum retries has reached. For applications which require reliability, the dropped data-unit is to be recovered at the transport layer level by TCP, which operates over ARQ. While TCP's retransmission policy continuously adjusts retransmission-timeout (RTO) based on the current round-trip-time, ARQ uses the static parameters set during the connection set-up procedure. This paper uses simulations to study the impact of one such static ARQ parameter, ARQ_BLOCK_LIFETIME on the performance of TCP-NewReno over IEEE 802.16 for Best Effort (BE) up-link traffic. Simulations were carried out using modified version of NS-2 WiMAX Simulator Release 2.6. The performance metric considered is TCP goodput. The results from the simulations show that the optimal value for ARQ_BLOCK_LIFETIME is influenced by Round Trip Time (RTT), the network-load, and error-rate.
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