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BT网络中通常会存在由于热心节点面临过多请求而无法及时处理而导致网络QoS降低的问题.为此,提出基于QoS约束集的策略.首先,提出并描述了影响BT网络QoS的属性约束集;其次,以约束集中的属性为基础,分析了影响节点优先级的因素,给出了节点在网络中的综合效用值的计算方法,并依据综合效用值确定了节点在网络中的优先级和服务顺序;最后,以优先级次序和邻居节点为基础,给出了抑制节点搭便车的处理过程,并对提出的策略进行了实验验证.实验结果表明,该策略在对搭便车节点进行抑制的同时保证了BT网络的QoS.
In BT network, there usually exists the problem that the network QoS can not be reduced due to too much request from enthusiastic nodes. Therefore, the strategy based on QoS constraint set is proposed.Firstly, the attribute constraint set that affects the QoS of BT network is proposed and described Secondly, based on the properties of constrained concentration, the factors that affect the priority of nodes are analyzed. The calculation method of the integrated utility value of nodes in the network is given, and the priority of nodes in the network is determined according to the comprehensive utility value. Finally, the process of restraining node free-riding is given based on priority order and neighbor nodes, and the proposed strategy is verified by experiments.Experimental results show that the proposed strategy can restrain the free-rider node BT network while ensuring the QoS.