中文摘要：

针对IEEE 802.15.4协议存在的退避指数范围较窄、缺乏优先级区分服务和时隙分配算法粗糙的不足,融合了基于碰撞感知的二进制退避算法和优先级区分服务,提出一种基于时间敏感的时隙分配算法,用以降低时延、提高系统的自适应性和提高时隙带宽利用率.最终以汽车传感网为应用对象,在OPNET中验证了所提出的融合改进型协议较原有协议在实时性能等方面的优越性.

英文摘要：

Aiming at the insufficiency, relatively narrow back-off index range, treating every event fairly and rough time slot allocation algorithm is rough of IEEE 802.15.4 protocol, a priority-based adaptive service-differentiation scheme and a collision-aware back-off mechanism are fused, and then a delay sensi- tive time slot scheduling is proposed in modified protocol to strengthen the adaptive performance of the system ,lower the delay and advance the bandwidth utilization respectively.And every proposed scheme is proved theoretically. Finally, the advantage in real-time performance of the proposed modified protocol compared with the original is verified in OPNET by applying it to vehicle wireless sensor network.