TCP-based Multi Parallel Links Exploiting Packet Re-routing Mechanisms in Diverse Channel Condition

This paper takes into account different characteristics of TCP-based MIMO sub-channels, including bit error rate (BER) and data rate, in addition to exploiting these differences by implementing sub-channel re-routing methods to improve overall goodput. We show that even simple packet routing mechanisms can provide an overall performance improvement when MIMO sub-channels have unequal error rate. Two scenario models are created: the first one is called a dual parallel-link scenario model where two nodes communicate over two wireless sub-channels, and the second scenario is a more interesting model named the quad-parallel independent link model (Quad-PILM). Simulation are derived for both models, enhanced with two novel switching methods SWS and PLD and two retry scenarios set up: RDL and RRL, in which showing how re-transmissions will be carried out. We investigate the system in the light of goodput under various channel differences. Based on our analysis, we determine the degree of improvement of our proposed models, and show that these techniques may be advantageous for multiple antenna systems.