A Connectionless Server Using AAL5 in Public ATM Networks

Woojin SEOK  Okhwan BYEON  Changhwan OH  Kiseon KIM  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E82-A   No.6   pp.994-1001
Publication Date: 1999/06/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section of Papers Selected from 1998 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC '98))
AAL5,  connectionless server,  reassembly forwarding mode,  

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Since ATM network is a connection-oriented network, the operation for connectionless service is required for data service in it. There are many ways to support connectionless service in ATM network. They are ATM LAN Emulation, Classical IP and ARP over ATM, Indirect approach, Direct approach, and IP switch. It is known that Direct approach is suited for public network. The connectionless server supports connectionless service in Direct approach. There have been presented two kinds of methods, that is, streaming forwarding method and reassembly forwarding method, to forward the frames in the connectionless server. Reassembly forwarding method can work well with AAL5 which has better efficient characteristics than AAL3/4 in terms of easy use and fewer overheads. This paper proposes an algorithm that can decrease the loss of frame by a proposed buffer management working with AAL5. This paper also investigates the structure of the proposed connectionless server and its performance with the one of the conventional connectionless server through simulations. The proposed connectionless server shows a less frame loss and transfer delay than that of the conventional connectionless server.