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Traditional network infrastructure is facing significant challenges to support the growing bandwidth, coverage, and latency requirements of users, and to support new 4G and 5G use-cases. As a solution, telecom operators are looking to implement Network Function Virtualization (NFV) in future networks. The placement of Virtual Network Functions (VNFs) plays a critical role in reducing latency to serve...
With Network Function Virtualization (NFV) generating significant interest in the network operator community, many network functions, including the LTE EPC, are being built as virtualized software appliances running on commodity hardware, as opposed to custom hardware. To provide fault tolerance and scalable performance, the virtualized network functions are typically built in a clustered architecture,...
How does a dense WiFi network perform, specifically for the common case of TCP download? While the empirical answer to this question is ‘poor’, analysis and experimentation in prior work has indicated that TCP clocks itself quite well, avoiding contention-driven WiFi overload in dense settings. This paper focuses on measurements from a real-life use of WiFi in a dense scenario: a classroom where several...
With an increase in the number of mobile users and traffic, mobile network operators are finding it difficult to scale their radio and core networks. Further, hardware network appliances are expensive to procure and upgrade, and are difficult to adapt and program for new services. These trends have recently spurred several efforts to redesign various components of mobile networks, including the LTE...
Network Function Virtualization (NFV) is a new trend in networking, where network functions are moving from custom hardware appliances to software implementations running on virtual machines (VMs) hosted on commodity hardware. While the benefits of NFV such as cost reduction and increased agility are well understood, doubts still exist on whether a software implementation can match up to the high...
Ns-3 is a widely used as a the network simulator of choice by researchers. It contains many well tested and high quality models of network protocols. However, the application layer models of ns-3 are very simplistic, and do not capture all aspects of real life applications. As a result, there is often a huge gap between the results of real experiments and the corresponding simulations. This problem...
This paper describes a system for improving user experience when accessing overloaded web servers. While several techniques exist today to build high-capacity web servers, little attention is paid to the fact that servers often crash when faced with transient overload, causing user experience to degrade sharply when incoming load exceeds capacity. Existing overload control mechanisms focus on some...
Over the past decade, the physical (PHY) layer of communication systems has evolved with the addition of techniques such as orthogonal frequency division multiplexing (OFDM) and multi-carrier aggregation. This has resulted in significant performance improvements, but it has come at the cost of increased power consumption and system complexity. To overcome this problem, a wide range of new Medium Access...
How does a dense WiFi network perform, specifically for the common case of TCP download? While the empirical answer to this question is ‘poor’, analysis and experimentation in prior work has indicated that TCP clocks itself quite well, avoiding contention-driven WiFi overload in dense settings. This paper focuses on measurements from a real-life use of WiFi in a dense scenario: a classroom where several...
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