The Collision Analysis of CSMA/CA for IEEE 802.15.4 Low-Rate Wireless Personal Area Network

• Main Authors: Jo-Yu Chang, 常若愚
• Other Authors: Wei-Tsong Lee
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/63188747574601239614

碩士 === 逢甲大學 === 資訊工程所 === 92 === With the growth quickly of the wireless network technology, there are more and more existent network servies trending to adopt wireless network technology. The popularization of IEEE 802.11 Wireless LAN and IEEE 802.16 Wireless Broadband Network, all make the wireless network technology become more and more important, and there are many relative technologies and products appeared. Following Bluetooth’s rise and development, Wireless Personal Area Network (WAPN) also became popular. Therefore, one application of WPAN – Wireless Sensor Network, also start to be discuss widely. Wireless Sensor Network (WSN) make use of a large number of sensor nodes to dispose in a particular range, and every sensor node must to sense the special information in the area (ex:temperature, humidity, pressure,etc). Then, transmit the data through wireless transmission technology to a special equipment (Sink) to analyze to sensing data and to do corresponding actions. WSN is one application of WPAN, there is no definite specifications. Now, many WSN research use IEEE 802.15.4 to design, it characteristic includes low rate, low transit distance, low power, simple architecture, low cost, small size, etc. All characteristic are similar to the applications of WSN. In IEEE 802.15.4, packets maybe occur collision or packet loss when sensor nodes try to transit. WSN’s transmission characteristic is differ from general network. General network always have large number of packets to be transmit, but WSN transmissive interval is long (1 min, 5 min, even 1 hour.).therefore, the characteristic of collision problem maybe differ from general network. IEEE 802.15.4 make use of CSMA/CA to solve collision problem, the CSMA/CA algorithm is similar to IEEE 802.11, but not all the same. We called Slotted CSMA/CA algorithm. I will explain in this paper. Furthermore, in this paper, I will aim at IEEE 802.15.4 collision mechanism, and use program to simulate the operation of IEEE 802.15.4. Finally, Analyze and estimate the performance of Slotted CSMA/CA algorithm, and try to find out the Slotted CSMA/CA’s optimum BE parameter in simulation result.