IEICE technical report. Information networks 

About: IEICE technical report. Information networks is an academic journal. The journal publishes majorly in the area(s): TCP acceleration & TCP global synchronization. Over the lifetime, 136 publications have been published receiving 314 citations.

A study on fairness and stability of congestion control mechanisms of TCP

Abstract: We focus on fairness and stability of the congestion control mechanisms adopted in several versions of TCP by investigating their time-transient behavior through an analytic approach. In addition to TCP Tahoe, TCP Reno, and TCP Vegas, we consider enhanced TCP Vegas which is proposed in this paper for fairness enhancements. We consider the homogeneous case, where two connections have the equivalent propagation delays, and the heterogeneous case, where each connection has different propagation delay. We show that TCP Tahoe and TCP Reno can achieve fairness among connections in the homogeneous case, but cannot in heterogeneous case. We also show that TCP Vegas can provide almost fair service among connection, but there is some unfairness caused by the essential nature of TCP Vegas. Finally, we explain the effectiveness of our enhanced TCP Vegas in terms of fairness and throughput.

Achieving power-law placement in wireless sensor networks

Abstract: One of the most important issues in sensor networks is to develop the technology for improved fault tolerance. From this viewpoint, the placement of sensor nodes is critical. To date, we have proposed stochastic node placements whose degrees of nodes follow a power-law ("power-law placement"). To demonstrate the effectiveness of power-law placement, we have to show that this placement has high fault tolerance and can be achieved with a reasonable degree of complexity and accuracy. In the first step of our research, we have shown that power-law placement with well-tuned parameters is more robust against failure than general stochastic node placement. In the second step to prove the effectiveness of power-law placement, we investigate ways of achieving power-law placement in this paper.

Transport Protocols for Fast Long-Distance Networks : Comparison of Their Performance in JGN

Abstract: Various new transport protocols have been proposed with the aim of the efficient use of abundant resources in fast long-distance networks, and a number of experiments to investigate the performances of those protocols have already been reported. However, they have mainly focused on the throughput characteristics of a single connection or under a stable condition, and thus, more variety of throughput characteristics in actual network environments should be investigated aiming at practical use. Therefore, in this paper, the throughput characteristics of some practical high-speed transport protocols, high-speed TCP (HSTCP), scalable TCP, and simple available bandwidth utilization library (SABUL) with multiple connections or with changes of competitive traffic are investigated through experiments on the Japan gigabit network (JGN), an open testbed in Japan, using implementations available to the public. For TCP-based protocols, the influence of the receiver-side OS (TCP implementation) on throughput performance is also investigated, which is of practical importance from the deployment viewpoint. On the basis of the results of these experiments, some considerations on transport protocols for fast long-distance networks are given.