Avoiding interferences and collisions among signals of beacons is the one of important issues to indoor location system for wireless sensor networks. Exclusive communication that makes only one beacon transmits its signals at one time can be utilized to resolve it in centralized architecture; and another effective beacon can be selected randomly as a center node in exclusive mode by current beacon leaving its exclusive state. Combining advantages of centralized and decentralized architecture helps to resolve the problem among signals interferences and collisions of different beacons effectively.%在无线传感器室内定位系统中,避免参考节点之间的信号相互冲突和干扰是定位系统重点解决的问题之一.针对这一问题,可以采用独占式通信机制,确保某一个参考节点独占某一时刻的通信,禁止其它节点在这一时刻发射信号；同时,采用无中心节点的构架模式,由独占通信的节点在发射信号结束时,随机选择一个有效的参考节点,使其成为下一个临时的中心节点并进入独占状态.该方法结合无中心构架和有中心构架的优点,有效地解决了参考节点之间信号相互间的冲突和干扰问题.
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