In today's wide area networks, especially in Optical Transport Networks (OTN) with Software Defined Networking (SDN) features enabled over Wavelength Division Multiplexing (WDM), Bandwidth on Demand (BoD) is an important service that can be satisfied by dynamic end-to-end service provisioning. Service provisioning time (SPT) and Blocking Probability (BP) are critical performance metrics for the users and carriers. This paper extends the concept of the Resource Delayed Release (RDR) strategy for WDM networks. The basic idea of this strategy is to introduce a delay in releasing the optical channel, when the channel is no longer carrying any services. This delay can help speed up the provisioning time for carrying the next service request, avoiding the time usually taken to establish a new optical channel. The main goals of the RDR method are to reduce SPT and BP while simultaneously satisfying the quality of service (QoS) constraints. In this paper, we investigate the effects of uniform and non-uniform traffic on the performance of RDR strategy. For non-uniform traffic simulation, we use a mesh topology with the 14 most populous cities in USA as of 2018 and model the non-uniform traffic based on population density. Further, we introduce a new metric called the Bandwidth Blocking Probability (BBP) to measure the quality of the service offered by the network. Simulation results show advantages of using the RDR method under a wide variety of traffic scenarios for both uniform and non-uniform traffic distributions compared to the traditional method. RDR reduces SPT by 45–90% for uniform traffic and 41–75% for non-uniform traffic. RDR reduces BP by 35–85% for uniform traffic and 30–75% for non-uniform traffic. Additionally, RDR lowers BBP by 31–73% for uniform traffic and 29–68% for non-uniform traffic.

在当今的广域网中，尤其是在通过波分复用 (WDM) 启用软件定义网络 (SDN) 功能的光传输网络 (OTN) 中，按需带宽 (BoD) 是一项重要的服务，可以通过动态端到端- 端服务提供。服务提供时间 (SPT) 和阻塞概率 (BP) 是用户和运营商的关键性能指标。本文扩展了 WDM 网络的资源延迟释放 (RDR) 策略的概念。该策略的基本思想是在光信道不再承载任何业务时引入释放光信道的延迟。这种延迟有助于加快承载下一个业务请求的开通时间，避免通常需要建立一个新的光通道的时间。RDR 方法的主要目标是减少 SPT 和 BP，同时满足服务质量 (QoS) 约束。在本文中，我们研究了统一和非统一流量对 RDR 策略性能的影响。对于非均匀交通模拟，我们使用截至 2018 年美国 14 个人口最多的城市的网状拓扑结构，并根据人口密度对非均匀交通进行建模。此外，我们引入了一个称为带宽阻塞概率 (BBP) 的新指标来衡量网络提供的服务质量。仿真结果表明，与传统方法相比，在均匀和非均匀交通分布的各种交通场景下使用 RDR 方法具有优势。RDR 将统一流量的 SPT 降低 45-90%，将非统一流量的 SPT 降低 41-75%。RDR 将均匀流量的 BP 降低 35-85%，将非均匀流量降低 30-75%。此外，RDR 将统一流量的 BBP 降低 31-73%，将非均匀流量的 BBP 降低 29-68%。