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Proceedings Paper

Priority-based recovery scheme improving network utilization in the IP over optical networks
Author(s): Sung-Woo Ryu; Dae-gun Kim; Joo Sang Youn; Sok Hyun Jung; Chul-Hee Kang
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Paper Abstract

This Paper presents a Priority Based Recovery Scheme (PBRS) improving the utilization of limited resource- i.e. light-paths- which is necessary when recovery mechanism occurred in the IP Over Optical Networks. PBRS is used in the RLG (Recovery Link Group) made by priority number of LP (Light path). We assumed there are three kinds of LPs by their traffic characteristics Mission-Critical, Best-Effort and Low-priority -in the RLG. When the LP faults are detected, primary LPs classified by the order of traffic priority choose recovery mechanism by their priority number value. In the priority based RLG, Each LP has its own recovery mechanism priority 1 LP (Mission-Critical traffic) use dedicated protection scheme, priority 2 LP (Best-effort traffic) uses preplanned restoration scheme and Priority 3 LP (Low-Priority traffic) uses dynamic restoration scheme. After recovery mechanism is accomplished, new LP Setup information based on the given priority information is transferred to ingress OXC (Optical Cross Connect) for the purpose of making new light path. OXC has structure capable of making new light paths or releasing light paths via signaling control to maintain consistent recovery capability, regardless of fault count, based on priority scheme. The PBRS has some advantages expanding availability of LPs that is limited resources in the optical network and designing the network that has consistent recovery capability. In this paper, we also present a Router and OXC structures, LP failure detection mechanism, and signaling procedures that are necessary to adopt PBRS. The performance and effectiveness of PBRS is demonstrated by means of statistical simulations on randomly generated mesh network topology.

Paper Details

Date Published: 9 September 2002
PDF: 12 pages
Proc. SPIE 4910, Optical Networking II, (9 September 2002); doi: 10.1117/12.482425
Show Author Affiliations
Sung-Woo Ryu, Korea Univ. (South Korea)
Dae-gun Kim, Korea Univ. (South Korea)
Joo Sang Youn, Korea Univ. (South Korea)
Sok Hyun Jung, Korea Univ. (South Korea)
Chul-Hee Kang, Korea Univ. (South Korea)

Published in SPIE Proceedings Vol. 4910:
Optical Networking II
Shizhong Xie; Chunming Qiao; Yun Chur Chung, Editor(s)

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