IPTV is increasingly being deployed and offered as a commercial service to residential broadband customers. Compared with traditional ISP networks, an distribution network (i) typically adopts hierarchical instead of mesh-like structure, (ii) imposes more stringent requirements on both reliability performance, (iii) has different protocols (which make heavy use IP multicast) traffic patterns, (iv) faces serious scalability challenges in managing millions elements. These unique...

Sensor networks include nodes with limited computation and communication capabilities. One of the basic functions sensor is to sense transmit data end users. The resource constraints security issues pose a challenge information aggregation in large networks. Bootstrapping keys another because public key cryptosystems are unsuitable for use resource-constrained In this paper, we propose solution by dividing problem two domains. First, present protocol establishing cluster using verifiable...

Cloud service providers use replication across geographically distributed data centers to improve end-to-end performance as well offer high reliability under failures. Content often involves the transfer of huge sets over wide area network and demands backbone transport capacity. In this paper, we discuss how a Globally Reconfigurable Intelligent Photonic Network (GRIPhoN) between could operational flexibility for cloud providers. The proposed GRIPhoN architecture is an extension earlier...

Service quality in operational IP networks can be impacted due to planned or unplanned maintenance. During any maintenance activity, the responsibility of operations team is complete work order and perform a check-up ensure there are no unexpected service disruptions. Once complete, it crucial continuously monitor network look for performance impacts. What lack today effective tools rapidly detect induced changes. The large scale heterogeneity elements metrics makes problem extremely challenging.

Network resiliency is crucial to IP network operations. Existing techniques recover from one or a series of failures do not offer performance predictability and may cause serious congestion. In this paper, we propose Resilient Routing Reconfiguration (R3), novel routing protection scheme that (i) provably congestion-free under large number failure scenarios; (ii) efficient by having low router processing overhead memory requirements; (iii) flexible in accommodating different requirements...

Chronic network conditions are caused by performance impairing events that occur intermittently over an extended period of time. Such can cause repeated degradation to customers, and sometimes even turn into serious hard failures. It is therefore critical troubleshoot repair chronic in a timely fashion order ensure high reliability large IP networks. Today, troubleshooting often performed manually, making it tedious, time-consuming error-prone process.

Networks continue to change support new applications, improve reliability and performance reduce the operational cost. The changes are made network in form of upgrades such as software or hardware upgrades, service features configuration changes. It is crucial monitor when because they can have a significant impact on if not monitored may lead unexpected consequences networks. This be achieved manually for small number devices, but does scale large networks with hundreds thousands routers...

Cellular service providers add carriers in the network order to support increasing demand voice and data traffic provide good quality of users. Addition new requires operators accurately configure their parameters for desired behaviors. This is a challenging problem because large number related various functions like user mobility, interference management load balancing. Furthermore, same can have varying values across different locations manage behaviors as planned respond appropriately...

In large-scale IPTV systems, it is essential to maintain high service quality while providing a wider variety of features than typical traditional TV. Thus assessment systems are paramount importance as they monitor the user-perceived and alert when issues occurs. For however, there no simple metric represent Quality Experience (QoE). Moreover, only limited user feedback, often in form noisy delayed customer calls. Therefore, we aim approximate QoE through selected set performance indicators...

Cellular network service providers often have to conduct small scale testing in the operational before a change (e.g., new feature) is fully rolled out across entire network. This referred as First Field Application (FFA). However, assessing effectiveness of FFA changes challenging because overlapping external factors: seasonality (foliage, leaves budding), weather (rain, snow, hurricanes, storms), traffic pattern due big events games at stadiums, students returning school after holidays),...

Configuration tuning is one of the top network operational tasks for Cellular Service Providers (CSPs), and typically done to either restore performance during degraded conditions such as congestion, failure, planned upgrades, or optimize service through change trials. A long-standing challenge in has been associate a causal relationship between configuration impact. Confounders (or, external factors) make this extremely hard. In paper, we focus on improving presence confounders 5G...

Availability is a critical issue in modern distributed systems. While many techniques and protocols for preventing denial of service (DoS) attacks have been proposed deployed recent years, formal methods analyzing proving them correct not kept up with the state art DoS prevention. This paper proposes new protocol malicious bandwidth consumption, demonstrates how game-based can be successfully used to verify availability-related security properties network protocols. We describe two classes...

IPTV is increasingly being deployed and offered as a commercial service to residential broadband customers. Compared with traditional ISP networks, an distribution network (i) typically adopts hierarchical instead of mesh-like structure, (ii) imposes more stringent requirements on both reliability performance, (iii) has different protocols (which make heavy use IP multicast) traffic patterns, (iv) faces serious scalability challenges in managing millions elements. These unique...

Network resiliency is crucial to IP network operations. Existing techniques recover from one or a series of failures do not offer performance predictability and may cause serious congestion. In this paper, we propose Resilient Routing Reconfiguration (R3), novel routing protection scheme that (i) provably congestion-free under large number failure scenarios; (ii) efficient by having low router processing overhead memory requirements; (iii) flexible in accommodating different requirements...

Change management has been a long-standing challenge for network operations. The large scale and diversity of networks, their complex dependencies, continuous evolution through technology software updates combined with the risk service impact create tremendous challenges to effectively manage changes. In this paper, we use data from provider experiences operations teams highlight need quick easy adaptation change capabilities keep up We propose new framework CORNET (COmposition fRamework...

Networks continue to change support new applications, improve reliability and performance reduce the operational cost. The changes are made network in form of upgrades such as software or hardware upgrades, service features configuration changes. It is crucial monitor when because they can have a significant impact on if not monitored may lead unexpected consequences networks. This be achieved manually for small number devices, but does scale large networks with hundreds thousands routers...

Recent deployments of Network Function Virtualization (NFV) architectures have gained tremendous traction. While virtualization introduces benefits such as lower costs and easier deployment network functions, it adds additional layers that reduce transparency into faults at layers. To improve fault analysis prediction for virtualized functions (VNF), we envision a runtime predictive system runs in parallel with existing reactive monitoring systems to provide operators timely warnings against...

We describe bandwidth-on-demand in an evolved multilayer, software-defined networking (SDN) based cloud services model. present motivation for using a multilayer architecture the wide-area network (WAN). Our laboratory testbed is described, and both hardware management are presented. also show initial proof-of-concept demonstration of this capability.

Planned upgrades in cellular networks occur every day, may often need to be performed on weekdays, and can potentially degrade service for customers. In this paper, we explore the problem of tuning network configurations order mitigate any potential impact due a planned upgrade which takes base station off-air. The objective is recover loss performance or coverage would have occurred without modifications. To our knowledge, mitigation downtimes has not been explored before literature....

Cellular service operators frequently tune the network configuration to optimize coverage, support seamless handovers, minimize channel interference, and improve performance experience end-users. Tuning such a complicated is highly challenging because of many parameters, evolving complexity cellular networks, diverse requirements across voice, video, data applications. Any misconfigurations or even poor settings can significantly negatively impact quality. In this paper, we propose new...

Cellular service providers (CSPs) require predicting the network performance for various reasons such as analyzing impact of planned configuration changes and large-scale events on network. Although configurations are widely considered key predictors performance, we claim that they insufficient accurately cellular performance. The networks impacted by unmeasured external factors (e.g., weather, called latents), therefore, prediction based solely may result in confounding effects. We show...

Cellular service providers (CSPs) aim to optimize network performance and enhance user experience by tuning configurations. However, this process often requires continuous live testing, which incurs significant operational costs. In paper, we focus on predicting the impact of configuration changes using historical data, thereby reducing need for tests. A key challenge in developing such a model is accounting unobserved external factors (e.g., weather, referred as latents) that can introduce...

Managing network configuration and improving service experience effectively is essential for cellular providers (CSPs). This challenging because of networks' large scale complexity, the wide variety parameters, performance impact tradeoffs resulting across multiple metrics geographical locations. paper focuses on learning using contexts to recommend performance-improving configurations. While contexts, one must carefully account parameter dependency, confusion that can arise due co-occurring...

Cellular network providers collect and use a wide variety of data for assessing the service quality experienced by their smartphone users. The is essential tasks ranging from event detection, problem diagnosis, impact analysis, coverage capacity planning, load balancing, performance optimization. For example, measurements drive-by tests provide useful detailed information about different aspects such as dropped calls due to handovers or radio interference. However, major challenge effective...