Variable Length Frame Multiple Access Scheme with Slot Exchange

Akeo MASUDA  Shigeru SHIMAMOTO 

Publication
B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)  Vol.J89-B  No.10  pp.1962-1970
Publication Date: 2006/10/01
Online ISSN: 1881-0209
Print ISSN: 1344-4697
Type of Manuscript: PAPER
Category: 
Keyword: 
packet radio communications,  radio access protocol,  TDMA,  random access, 

Full Text(in Japanese): PDF(372KB)

Summary: 
In this paper, a hybrid multiple access scheme called VLF (Variable Length Frame access scheme) is proposed. In VLF, number of the terminals that share one timeslot is controlled by changing the frame length according to the intenseness of the packet generation load. Additionally we propose a retransmission scheme which we call it VLFX, in which the assigned slots are dynamically exchanged for efficient slot usage. Theoretical analysis and computer simulation are performed to evaluate throughput and delay characteristics. Compared to IEEE802.11 DCF and PCF, VLFX shows better performance in any condition of offered load, and it shows better robustness to propagation delay time.