Consolidation Algorithm Interoperability in Point-to-Multipoint ABR Services in ATM Networks

Abstract

Abstract. The point-to-multipoint ABR service is a very important service in ATM networks. Recently, several researchers have studied the issues on multicast ABR services and have proposed a family of consolidation algorithms. All of the previous proposed algorithms have some drawbacks such as slow response, high consolidation noise and high implementation complexity etc. Hence, we propose a new efficient consolidation algorithm which overcomes all such drawbacks. We also recognize that in point-to-multipoint ATM n etworks, there is a possibility that the branch points will adopt different consolidation algorithms. We, therefore, investigate the interoperability issue and the impact of using different types of consolidation algorithm at the upper and lower stream branch points and show that the branch points with different consolidation algorithms can work interoperably. It is concluded from the simulation results that in order to avoid the consolidation noise and get a faster response in the network the most upper st ream branch point (the nearest one to the source) has to be implemented with a high accuracy consolidation algorithm and the lower stream branch point(s) should be implemented with a fast response consolidation algorithm. Moreover, using our proposed consolidation algorithm, fast response, low consolidation noise and low implementation complexity are achieved.

Performance analysis and interoperability issue of consolidation algorithms in point‐to‐multipoint ABR services

“…Case III: Fahmy For Fahmy algorithm, as described before, if there is no overload at the branch point it works in a wait-for-all mode. The source rate equation look similar to (10) and (11). In case an overloaded condition is detected at the branch point, the branch point will send instantly a BRM with the minimal value between ER in BRM at that time and the calculated fair share value to the source.…”

“…There were many papers [13][14][15][16] proposing a performance analysis of the unicast ABR services. For ABR multicast, there are some papers which proposed the consolidation algorithms [5,[7][8][9][10][11]17,18] but only few literatures analysed the algorithm mathematically [4,6]. In this paper, we analysed and compared the performance of various types of consolidation algorithms.…”