Abstract: Data gathering protocol is the main application of WSN.Its first aim is to save energy efficiently and prolong the network lifetime.This paper presents an idea of and differentiated service.Based on the idea，an algorithm named DSDG is presented which uses differentiated service mechanism，it both use in-network data aggregation technology to efficiently collect data periodically and meet the requirement of urgent data processing.DSDG use differentiated service on network data flow，on the other hand，this algorithm uses high efficient network data fusion technology on data transmission process.Simulation experiment indicates that compared with LEACH and HEED，DSDG can make the WSN possess longer lifetime and better expansibility.

Key words: wireless sensor network, data gathering, data aggregation, differentiated service, simulation

摘要： 数据收集是无线传感器网络最基本的应用，数据收集协议设计的首要目标是有效节约能源，延长网络生命周期。提出了一种网内数据融合和网络区分服务的思想，在此基础上实现了一种既能采纳网内数据融合技术，高效周期性地收集检测数据，又能满足紧急数据处理要求的具有区分服务机制的数据收集算法DSDG（Differentiated Service in-network data aggregation Data Gathering algorithm）。该算法对网络中数据流采用区分服务，在数据传输过程中采用高效的网内数据融合技术。仿真实验表明，与LEACH、HEED协议比较，DSDG数据收集协议能使WSN具有更长的网络寿命和更好的可扩充性。

关键词: 无线传感器网络, 数据收集, 数据融合, 区分服务, 仿真