Performance Analysis of Multi-channel Slotted ALOHA System using Iterative Contending-user Estimation Method

• Main Authors: Che-Yuan Chiang, 江哲元
• Other Authors: Ray-Guang Cheng
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/75144211451774381194

碩士 === 國立臺灣科技大學 === 電子工程系 === 101 === Multi-channel slotted ALOHA is the main channel access scheme for the random access channels of the next generation cellular networks. Seo and Leung [1] proposed a novel Markov-chain-based analytical model to analyze the performance of multi-channel slotted ALOHA adopting uniform backoff and exponential backoff policies. The model is developed assuming that each terminal adopts a delay-first transmission (i.e., performs random backoff before transmitting a new packet. However, this assumption is not always enforced in all networks. This paper presents a difference-equation-based analytical model to solve the same problem considered in [1]. The proposed model is developed based on an iterative contending-user estimation method and it can be applied for general networks with or without the delay-first transmission. Computer simulations were conducted to verify the accuracy of the analysis. The results show that the proposed model can accurately e7stimate the system throughput, average access delay, and packet-dropping probability of the networks