Abstract
An important aspect of quality-of-service (QoS) provisioning in integrated networks is the ability to find a feasible route that satisfies a set of end-to-end QoS requirements (or constraints) while efficiently using network resources. In general, finding a path subject to multiple additive constraints (e.g., delay, delay-jitter) is an NP-complete problem. We propose an efficient randomized heuristic algorithm to this problem. Although the algorithm is presented as a centralized one, the idea behind it can also be implemented in a distributed manner. Our algorithm initially computes the cost of the best path from each node to a given destination with respect to individual link weights and their linear combination. In this initialization step, Reverse-Dijkstra's algorithm is used K + 1 times per path request, where K is the number of additive constraints. The algorithm then randomly traverses the graph, discovering nodes from which there is a good chance of reaching the final destination. This randomized search is a modification of the breadth-first search (BFS). Using extensive simulations, we show that the proposed algorithm provides better performance than existing algorithms under the same order of computational complexity.
Original language | English (US) |
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Pages (from-to) | 251-268 |
Number of pages | 18 |
Journal | Computer Networks |
Volume | 36 |
Issue number | 2-3 |
DOIs | |
State | Published - Jul 2001 |
Keywords
- Multi-constrained path selection
- QoS-based routing
- Scalable routing
ASJC Scopus subject areas
- Computer Networks and Communications