TY - GEN

T1 - Multiconstrained QoS routing

T2 - 50th Annual IEEE Global Telecommunications Conference, GLOBECOM 2007

AU - Xue, Guoliang

AU - Zhang, Weiyi

PY - 2007/12/1

Y1 - 2007/12/1

N2 - A fundamental problem in quality-of-service (QoS) routing is to find a path connecting a source node to a destination node that satisfies K ≥ 2 additive QoS constraints. This multiconstrained path problem (MCP) is known to be NP-complete. In a recent paper, Xue et al. showed that the shortest path with respect to a single auxiliary edge weight (obtained by combining the K edge weights into a single metric) is a K-approximation to MCP, in the sense that the largest ratio of path weight over its corresponding constraint is within a factor of K from minimum. In this paper, we present a simple greedy algorithm and prove that this greedy algorithm is also a K-approximation algorithm to MCP. Extensive computational results show that this greedy algorithm is superior to the previously best known K-approximation algorithm in terms of the quality of the path computed. Our algorithm is as simple as Dijkstra's shortest path algorithm, and is therefore suitable for implementation in Internet protocols.

AB - A fundamental problem in quality-of-service (QoS) routing is to find a path connecting a source node to a destination node that satisfies K ≥ 2 additive QoS constraints. This multiconstrained path problem (MCP) is known to be NP-complete. In a recent paper, Xue et al. showed that the shortest path with respect to a single auxiliary edge weight (obtained by combining the K edge weights into a single metric) is a K-approximation to MCP, in the sense that the largest ratio of path weight over its corresponding constraint is within a factor of K from minimum. In this paper, we present a simple greedy algorithm and prove that this greedy algorithm is also a K-approximation algorithm to MCP. Extensive computational results show that this greedy algorithm is superior to the previously best known K-approximation algorithm in terms of the quality of the path computed. Our algorithm is as simple as Dijkstra's shortest path algorithm, and is therefore suitable for implementation in Internet protocols.

KW - Efficient approximation algorithms

KW - Greedy algorithms

KW - Multiple additive constraints

KW - QoS routing

UR - http://www.scopus.com/inward/record.url?scp=39349095835&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=39349095835&partnerID=8YFLogxK

U2 - 10.1109/GLOCOM.2007.359

DO - 10.1109/GLOCOM.2007.359

M3 - Conference contribution

AN - SCOPUS:39349095835

SN - 1424410436

SN - 9781424410439

T3 - GLOBECOM - IEEE Global Telecommunications Conference

SP - 1866

EP - 1871

BT - IEEE GLOBECOM 2007 - 2007 IEEE Global Telecommunications Conference, Proceedings

Y2 - 26 November 2007 through 30 November 2007

ER -