Nec Corporation

Huanxu Pan

Satoru Yamano

Kazutomo Kobayashi

Takashi Shiraki

Shohei Sato

An inputting unitof a channel bandwidth utilization ratio evaluating serverinputs various traffic parameters and transmission parameters. A packet sending-out time computing sectionobtains a packet sending-out channel time based upon a packet size and the transmission rate. Further, a probability computing sectionobtains a channel bandwidth utilization ratio based upon the packet sending-out channel time, a cycle time of a packet, and a communication error ratio. Further, the channel bandwidth utilization ratio evaluating serverevaluates the obtained channel bandwidth utilization ratio. For example, the channel bandwidth utilization ratio evaluating serverdetermines whether or not receipt of a new call is permitted based upon the obtained channel bandwidth utilization ratio. Further, the channel bandwidth utilization ratio evaluating serverdetermines an optimum control based upon the obtained channel bandwidth utilization ratio.

Method of evaluating channel bandwidth utilization ratio, wireless communication system, apparatus for evaluating channel bandwidth utilization ratio and program thereof

A traffic performance in a tree type multi-hop wireless network of a CSMA/CA method is evaluated easily and highly precisely. A traffic performance evaluation system in the multi-hop wireless network includes: a performance index estimation unit regarding the multi-hop wireless network as a combination of a plurality of single-hop wireless networks and estimating a traffic performance index around each node of the network; and a performance index determination unit determining a traffic performance index of the whole multi-hop wireless network based on an estimation result of all the nodes by the performance index estimation unit.

Traffic performance evaluation system in wireless network and method thereof

A method for evaluating the performance of a wireless LAN (local area network) system having a single access point and a plurality of transmission terminals, which share the same radio channel, comprises the steps of dividing the plurality of transmission terminals into groups in accordance with radio conditions, calculating a transmission probability and a post-transmission failure probability for each group using a transmission rate, an error rate, and the number of terminals of each group, and calculating a throughput based on the transmission probability and post-transmission failure probability. A characteristic value for packet transmission delay may also be calculated based on the transmission probability and post-transmission failure probability. According to this method, the performance such as the throughput and the packet transmission delay can be evaluated in a wireless LAN system even before the wireless LAN system is constructed.

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Tokyo, Japan

Huanxu Pan