Hierarchy Schedule Sensing Protocol for CDMA Wireless Networks and Its Performance under Multiple Collision and Capture Effect

Hsiao-Hwa CHEN  

IEICE TRANSACTIONS on Communications   Vol.E83-B   No.3   pp.703-712
Publication Date: 2000/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Mobile Communication
wireless network,  spread spectrum,  CDMA,  protocol,  

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This paper proposes a new protocol for ad hoc based CDMA wireless local area networks, Hierarchy Schedule Sensing (HSS) protocol. It adopts hierarchical sensing to schedule transmission requests to avoid collisions. Multi-level group spreading codes are used to reduce scheduling delay. The network performance under the HSS protocol is evaluated using a two-dimensional Markov chain model in consideration of collided packets capture effect at receivers. The paper also focuses on the impacts of multiple packet collisions on the performance. A closed formula of the average collision rate is derived explicitly. The results show that the HSS protocol offers a robust performance with low hardware requirement.