Planning of survivable long-reach passive optical network
(LR-PON) against single shared-risk link group (SRLG) failure
Yejun Liu, Lei Guo
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, Cunqian Yu, Yinpeng Yu, Xiaorui Wang
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
article info
Available online 18 June 2013
Keywords:
Long-Reach Passive Optical Network
(LR-PON)
Survivability
Protection
Backup fiber
abstract
Long-Reach Passive Optical Network (LR-PON) is known as a promising and economical
solution for Next-Generation PON (NG-PON). Survivability is one of the key issues in the
planning of LR-PON because massive high-rate traffic flows may be interrupted in case of
network component failure. However, the survivability issue for LR-PON is addressed in
little works. More importantly, most of the previous works focus on si ngle distribution
fiber failure and remain untouched the simultaneous failure of multiple distribution
fibers, which is a possible failure scenario in LR-PON. In this paper, we focus on the
survivability of LR-PON against single Shared-Risk Link Group (SRLG) failure. A reliability
model is proposed to represent the disconnection probability of the ONUs. Based on this
reliability model, we propose a novel Backup Fibers Protection (BFP) scheme. In the BFP
scheme, we deal with the optimization problem of allocating backup capacity and
deploying backup fibers. Under the constraint of reliability requirement, our objective is
to fully protect all traffic demand in the network with the minimum deployment cost of
backup fibers. Both ILP-based approach and heuristic approach are proposed to solve the
optimization problem in the BFP scheme. To the best of our knowledge, this paper is the
first work regarding the survivability of LR-PON against single SRLG failure. Through
extensive simulation, we investigate the performance of BFP and demonstrate its
effectiveness in different scenarios.
& 2013 Elsevier B.V. All rights reserved.
1. Introduction
During the past decade, Internet traffic shows an expo-
nential gr owth with the annual growth rate of about 75%. The
reason for such explosive growth of Internet traffic is mostly
explained as the emergence of massive new service, e.g.,
online content-sharing applications and high-definition (HD)
video applications. It is predicted that the Internet video
applications will experience the annual growth rate of 4 7% in
next decade [1]. This imposes more challenges for the design
of access network, which may become the bandwidth bottle-
neck between user -end and Internet. The traditional access
technology, such as the Digital Subscriber Line series (i.e.,
x-DSL), can provide the peak bandwidth about 20–30 Mbps.
Particularl y , the Very-high-bit-rate DSL (VDSL) can support
the bandwidth of 50 Mbps. Howe ver, the DSL access technol-
ogy is limited in the network reach (less than 300 m).
It cannot satisfy the increasing requir ements of the broad-
band access in future [1–4].
Passive Optical Network (PON) is widely known as a
promising solution for broadband access due to its advan-
tage in bandwidth capacity and transmission stability
[5–7]. A typical architecture of PON, e.g., Time Division
Multiplexing PON (TDM PON), is shown in Fig. 1. Generally,
it has a tree topology. All Optical Network Units (ONUs) are
connected to the common Optical Line Terminal (OLT) in
the Central Office (CO) sequentially through the distribu-
tion fibers, the splitter and the feeder fiber. The capacity of
the feeder fiber is shared among all ONUs by means of
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Optical Switching and Networking
1573-4277/$ - see front matter & 2013 Elsevier B.V. All rights reserved.
http://dx.doi.org/10.1016/j.osn.2013.06.001
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Correspondence to: P. O. Box 365, College of Information Science and
Engineering, Northeastern University, Shenyang 110819, China.
Tel./fax: +86 24 83684219.
E-mail address: haveball@gmail.com (L. Guo).
Optical Switching and Networking 11 (2014) 167–176