An Improved Congestion Control Algorithm for Satellite Broadband Networks
Hui Wang · Journal of Astronautics · 2009
In satellite broadband networks,congestion controls have lower throughput performance mainly due to long propagation delays and high link error rates.Considering these characteristics,a new congestion control scheme called TCPCA is proposed.The Casablanca discriminator is adopted in the receiver to distinguish wireless losses from congestion losses to solve the problem of high link error rates.In order to alleviate the long retransmission intervals brought by long propagation delays,bulk retransmissions are introduced to retransmit the lost packets in time.Since long propagation delays make the networks need more time to recover,an intelligent congestion window adjustment strategy is adopted to avoid the unnecessary decrease of congestion window due to wireless losses.NS2 simulations show that TCPCA outperforms other conventional TCP schemes in terms of throughput.It also ensures a fair share of network resources with retaining friendliness to other TCP variants.