| Home network is a new network form in family region, connecting computer, household appliances, automation equipment, security system, illumination system access to Internet. It becomes the latest hot point and development direction in network market. IEEE802.15.4/ Zigbee technology is one of wireless connection technology suitable for home networking. It aims at low-rate wireless personal area network and makes low energy consumption, low transmission rate, and low cost as key objectives. It provides uniform standard for low data rate wireless connectivity among different devices in personal or family regions.This paper introduced the architecture, network topology and functions of IEEE802.15.4 standard. It also made specific description of superframe structure, data transmission model, frame type, energy consumption and safety, expounded the implement of carrier sense multiple access with collision avoidance (CSMA-CA) channel access and the allocation of guaranteed time slots (GTS).The paper studied the networking of IEEE802.15.4, described the function of the important primitives, constants and attributes, it analyzed and modeled the improvement of star network from five aspects: channel scan, PAN coordinator establishment, association, data transmission and disassociation.The paper analyzed the association flow in detail, made further research and simulation to find that the transmission in non-direct way requires a longer association time. The paper advanced an improving method to reduce redundant primitives, decrease association delay and avoid collision. The comparion of the simulation result of IEEE 802.15.4 and the improving method shows that the number of association primitives decreased 31%, the association time decreased 84%. The advantage of improving method would be more obvious when large quantity of nodes associate in a short time. It could also be well applied in home network. |
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