TY - JOUR
T1 - Enhancement of Performance of TCP Using Normalised Throughput Gradient in Wireless Networks
AU - N.G.Goudru1 and B.P.Vijayakumar
JO - Journal of Information and Computing Science
VL - 3
SP - 214
EP - 234
PY - 2024
DA - 2024/01
SN - 11
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jics/22514.html
KW - congestion-loss, convergence, immediate-recovery, loss-predictor, stability, transmission-loss, 
wireless-networks. 

AB -  Transmission  control  protocol  (TCP)  is  a  dominant  transport  layer  protocol  for  reliable  data 
delivery in the internet. When packet loss occurs, TCP makes an implicit assumption that all packet loss is 
due to congestion. This results in unnecessary degradation in the TCP performance while traversing over a 
wireless link. In  this paper, to improve  the performance of TCP,  we  use NTG loss-predictor to distinguish 
congestion loss from transmission loss. Based on the prediction of type of loss, an appropriate algorithm is 
invoked  by  using  NTG  loss-prediction  parameter  β.  Frequency  of  congestion  loss  and  wireless  loss 
predictions are analysed. Performance of TCP is improved further by discussing stability analysis over the 
system.  A  time-delay  control  theory  is  used  and  by  constructing  Hermit  matrix,  analysis  is  made  for 
asymptotic stability of the system. Explicit conditions are derived for Pmax (RED controller) and β (NTG loss 
controller)  in  terms  of  wireless  network  parameters.  Using  the  characteristic  equation  of  the  matrix, 
convergence  of  the  queue  length  at  the  bottleneck  router  is  discussed.  Analysis  of  convergence  of  queue 
length  to  a  given  target  value  is  analysed.  This  establishes  stability  in  the  router  performance.    An 
approximate solution of queue length is derived. Our results provide better solutions for global stability and 
convergence conditions of the system.