NDLI: A comprehensive study on backup-bandwidth reprovisioning after network-state updates in survivable telecom mesh networks

Content Provider	ACM Digital Library
Author	Zhang, Jing Song, Lei Mukherjee, Biswanath
Copyright Year	2009
Abstract	The capacity of a telecom fiber is very high and continues to increase, due to the advances in wavelength-division multiplexing (WDM) technology. Thus, a fiber-link failure may cause huge data (and revenue) loss. Reprovisioning (or re-optimization) of backup (or protection) bandwidth is an effective approach to improve network survivability while preventing existing services from unnecessary interruption. Most research works to date focus on applying backup-resource reprovisioning when a network failure occurs, or at some particular intervals over a certain time period. A network's state changes when any one of the following four events occurs: 1) a new connection arrives; 2) an existing connection departs; 3) a network failure occurs (e.g., a fiber cut); or 4) a failed network component (e.g., a fiber cut) is repaired. Moreover, backup-bandwidth rearrangement can also be triggered when resource overbuild (RO) [1] exceeds a predefined threshold or blocking occurs. In this study, we investigate the benefits of performing backup reprovisioning for part of (or all) the existing connections after network-state updates to improve network robustness as well as backup-bandwidth utilization in survivable telecom mesh networks. We study the effect of different backup reprovisioning periods (assuming no failure occurrence), which represents a tradeoff between capacity optimization and computation/reconfiguration overhead. We also examine the performance of an RO-threshold-triggered backup-reprovisioning approach. A wavelength-convertible network model and shared-path-protected routing strategy are assumed in this study. We consider a link-vector model in which a vector is associated with each link in the network, indicating the amount of backup bandwidth to be reserved on the link to protect against possible failures on other links. Our simulation results demonstrate that our approaches achieve better backup-capacity utilization and network robustness, compared to a conventional scheme which reprovisions backup paths for connections only when a network failure occurs.
Starting Page	1366
Ending Page	1377
Page Count	12
File Format	PDF
ISSN	10636692
DOI	10.1109/TNET.2008.918083
Volume Number	16
Issue Number	6
Journal	IEEE/ACM Transactions on Networking (TON)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-12-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	WDM Backup reprovisioning Mesh Multiple concurrent failures Optical Protection Restoration Survivability Telecom network
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Networks and Communications Software Computer Science Applications

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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