Telecommunication networks: protocols, modeling and analysis
Telecommunication networks: protocols, modeling and analysis
Communication networks: a first course
Communication networks: a first course
Wireless Personal Communications: An International Journal
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This paper presents, optimizes, and analyzes the performance of a novel hybridSelective Repeat/Multi Copy(SR/MC) Automatic Repeat Request (ARQ) scheme for transmitting fragmentedInternetProtocol (IP) packets. The ARQ scheme works in the SR mode until the last IPpacket fragment istransmitted. If a fragment is negatively acknowledged after the last fragmentis transmitted, then the system goes into theMC mode. In the MC mode, multiple copies of the erroneous fragment aretransmitted. After the IPfragments are received without error, the system returns to the SR mode.The optimization of the ARQ is done in terms of two parameters: fragment sizeand the optimum number of packetsto be transmitted in the MC mode, M. Optimum values for both parameters arecalculated for Bit ErrorRate (BER), throughput, IP packet size, and delay. The fragment size is alsocalculated for actual datathroughput for a given IP packet size, both with and without Forward ErrorCorrection (FEC). Then,the performance of the proposed scheme is evaluated in terms of BER andIP packet size with theoptimum M and fragment size. Performance results are obtained with and withoutBose ChaudhuriHocquenghem (BCH) error correction codes under Additive White Gaussian Noise(AWGN) as wellas Flat Rayleigh Fading channels. The ARQ scheme gives optimum performance forM equal to 10fragments and fragment size of 75 bytes. Under the AWGN channel, a throughputof 0.9 is achieved for any IPpacket size and at higher BER conditions compared to the Selective Repeat +Stutter Scheme 2 (SR + ST 2).An 8 dB improvement is achieved under the flat Rayleigh fading channel usingBCH(63, 51, 2) for a throughputof 0.9.