Abstract
A multilink failures model, i.e., probabilistic-shared risk link group (PSRLG), is adopted to investigate the problem of differentiated quality-of-protection (QoP) provisioning for flexi-grid optical networks. As a metric, service failure probability (SFP) is introduced to exactly examine the feasibility of differentiated QoP schemes, which denotes the failure probability of a connection during transmission. According to different reliability require- ments, connection requests are divided into three classes, i.e., class high, class middle, and class low. Then two differentiated QoP provisioning schemes are proposed based on the class division, i.e., intraclass-shared re- source scheme (ICSR scheme) and cross-class-shared resource scheme (CCSR scheme). The former allows a connection to share backup resources only with those connections in the same class, whereas the latter enables the connections in different classes to share backup resources. Simulation results show that our proposed schemes could well provide differentiated reliability with PSRLG constraint and achieve a good balance between reliability and resource efficiency. Moreover, the CCSR scheme achieves lower blocking probability, lower re- source redundancy, and higher spectrum utilization without sacrificing reliability compared to the ICSR scheme. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in
Highlights
Flexi-grid optical networks have attracted much attention from academia and industry.1,2 Different from the conventional wavelength division multiplexing (WDM) networks, flexi-grid optical networks could allocate just enough spectrum resources for the clients and support the subwavelength, super-wavelength, and multiple-rate data traffic requirements, thereby it could achieve higher spectrum resource efficiency
The two primary paths are link-disjoint, so backup resource sharing is allowed on link (0, 2). Based on this simple analysis, we could see that the reliability of a connection established by this algorithm would be affected by two factors: the first one is that the primary path and backup path simultaneously fail, for example, in Fig. 1(d), when probabilistic-shared risk link group (PSRLG) r5 occurs, link [5, 6] on PW2 and link [6, 9] on PB2 may fail simultaneously; the second one is caused by the failure in competing for the backup resource
Based on the shared-path protection algorithms proposed in Sec. 3.1, we propose two differentiated QoP schemes to provide a unified solution of jointly supporting services with different reliability requirements, which are the ICSR scheme and the CCSR scheme
Summary
Flexi-grid optical networks have attracted much attention from academia and industry. Different from the conventional wavelength division multiplexing (WDM) networks, flexi-grid optical networks could allocate just enough spectrum resources for the clients and support the subwavelength, super-wavelength, and multiple-rate data traffic requirements, thereby it could achieve higher spectrum resource efficiency. In Ref. 14, full SRLG-disjoint protection (FSDP) was proposed, where each connection request was assigned one working path and one SRLG-disjoint backup path. Partial SRLG-disjoint protection, where backup resources could be shared only if the joint reliability of their corresponding working paths can satisfy the survivability requirements other than being strictly SRLG-disjoint. Based on these works mentioned above, three shared-path protection algorithms are designed, which are full PSRLGdisjoint protection (FPDP), partial PSRLG-disjoint protection (PPDP), and full link-disjoint protection (FLDP). Two differentiated QoP provisioning schemes are proposed, i.e., intraclass-shared resource scheme (ICSR scheme) and cross-class-shared resource scheme (CCSR scheme), to provide differentiated QoP for flexi-grid optical networks.
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