Journal of Astronautics ›› 2020, Vol. 41 ›› Issue (2): 234-244.doi: 10.3873/j.issn.1000-1328.2020.02.013

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A TCP Vegas Model for Geospatial Sensor Networks

JIANG Yue qiu, GUAN Qi xue, TIAN Ye, GUAN Shi jie   

  1. College of Information Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
  • Received:2019-01-21 Revised:2019-03-12 Online:2020-02-15 Published:2020-02-25

Abstract: To solve the problem that the throughput degradation in the forward link led by the bandwidth asymmetry of the geospatial sensor networks, this paper proposes a congestion control model which can maintain the reverse link acknowledgement frequency based on delay time. The model, which is based on the queuing delay of the packet in the reverse link, can reduce the sending frequency of the acknowledgment packet to alleviate the congestion of the reverse link, when congestion occurs on the reverse link; and can increase the sending frequency of the acknowledgment packet to improve the throughput of the forward link data packets, when no congestion occurs on the reverse link. Furthermore, the model, which adds the delay time between two continuous acknowledgment packets to the base round-trip time, can make the base round-trip time more accurately, thereby improving the congestion control effect of the model on the forward link. The results of the simulation indicate the problem of the low throughput in the forward direction caused by the congestion in the reverse direction can be solved.

Key words: Geospatial sensor network, Space communication, Asymmetric link, Propagation delay, Congestion control

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