Small cells constitute a promising solution for managing the mobile data growth that has overwhelmed network operators. Local caching of popular content items at small cell base stations (SBSs) been proposed to decrease costly transmissions from macrocell without requiring high capacity backhaul links connecting SBSs with core network. However, policy design is challenging problem especially if one considers realistic parameters such as bandwidth constraints can be reached in congested urban...

The proliferation of innovative mobile services such as augmented reality, networked gaming, and autonomous driving has spurred a growing need for low-latency access to computing resources that cannot be met solely by existing centralized cloud systems. Mobile Edge Computing (MEC) is expected an effective solution meet the demand enabling execution tasks at network-periphery, in proximity end-users. While number recent studies have addressed problem determining service routing user requests...

The landscape toward 5G wireless communication is currently unclear, and, despite the efforts of academia and industry in evolving traditional cellular networks, enabling technology for still obscure. This paper puts forward a network paradigm next-generation targeting to satisfy explosive demand mobile data while minimizing energy expenditures. builds on two principles; namely caching multicast. On one hand, policies disperse popular content files at edge, e.g., pico-cells femto-cells,...

Mobile edge computing provides the opportunity for wireless users to exploit power of cloud without a large communication delay. To serve data-intensive applications (e.g., video analytics, machine learning tasks) from edge, we need, in addition computation resources, storage resources storing server code and data as well network bandwidth receiving user-provided data. Moreover, due time-varying demands, placement needs be adjusted over time, which raises concerns system stability operation...

Distributed caching architectures have been proposed for bringing content close to requesters and the key problem is design algorithms reducing delivery delay. The obtains an interesting new twist with advent of advanced layered-video encoding techniques such as Scalable Video Coding (SVC). We show that finding configuration video layers minimizes average delay a network operator NP-Hard, we establish pseudopolynomial-time optimal solution using connection multiple-choice knapsack problem....

The proliferation of innovative mobile services such as augmented reality, networked gaming, and autonomous driving has spurred a growing need for low-latency access to computing resources that cannot be met solely by existing centralized cloud systems. Mobile Edge Computing (MEC) is expected an effective solution meet the demand enabling execution tasks at network edge, in proximity end-users. While number recent studies have addressed problem determining service routing user requests...

Video delivery to mobile users is one of the largest challenges that network operators face today. In this work we consider a heterogeneous cellular with storage capable small-cell base stations, and study problem for pre-stored video files can be encoded two different schemes, namely versions or layers, in various qualities. We introduce framework joint derivation caching routing policies quality requirements. This allows operator optimize balanced objective incurred servicing cost,...

We consider the problem of storing segments encoded versions content files in a set base stations located communication cell. These work conjunction with main station Users move randomly across space based on discrete-time Markov chain model. At each time slot user accesses single it's current position and it can download only part stored it, depending duration. assume that file requests must be satisfied within given deadline order to successful. If amount downloaded (encoded) data by...

Caching popular content files at small-cell base stations (SBSs) has emerged as a promising technique to meet the overwhelming growth in mobile data demand. Despite plethora of work this field, specific aspect been overlooked. It is assumed that all users remain stationary during transfer and therefore complete copy requested file can always be downloaded by associated SBSs. In work, we revisit caching problem realistic environments where moving intermittently connect multiple SBSs...

Nowadays, there is a fast-paced shift from legacy telecommunication systems to novel Software Defined Network (SDN) architectures that can support on-the-fly network reconfiguration, therefore, empowering advanced traffic engineering mechanisms. Despite this momentum, migration SDN cannot be realized at once especially in high-end cost networks of Internet Service Providers (ISPs). It expected ISPs will gradually upgrade their over period spans several years. In paper, we study the upgrading...

The deployment of small cells is expected to gain huge momentum in the near future, as a solution for managing skyrocketing mobile data demand growth. Local caching popular files at cell base stations has been recently proposed, aiming reducing traffic incurred when transferring requested content from core network users. In this paper, we propose and analyze novel approach that can achieve significantly lower compared traditional schemes. Our cache design policy carefully takes into account...

Fog architectures at the network edge are becoming a popular research trend to provide elastic resources and services end-users, where processing capacity resides periphery as opposed traditional data-centers. Despite their momentum, control plane of these remains complex challenging implement. To enhance capability, in this work, we propose use Software Defined Networking. SDN moves logic off data devices onto external entities, controllers. We proof-of-concept implementation...

The ever increasing demand for content is straining operators' networks, thereby necessitating development of alternative delivery mechanisms. Distributed caching architectures constitute a promising solution mitigating the effects growth by placing popular files in proximity to users, rather than central site. In this paper, we study placement problem multiple-level hierarchical networks where user requests are routed upwards toward servers, satisfied intermediate nodes if latter have...

Modern tactical operations have complex communication and computing requirements, often involving different coalition teams, that cannot be supported by today's mobile ad hoc networks. To this end, the emerging software defined networking (SDN) paradigm has potential to enable redesign successful deployment of these systems. In article, we propose a set novel architecture designs for SDN-enabled networks in field. We discuss detail challenges raised network environment, present specific...

As the ever growing mobile data traffic challenges economic viability and performance of cellular networks, innovative solutions that harvest idle user-owned network resources are gaining increasing interest. In this work, we propose leasing wireless bandwidth cache space residential 802.11 (WiFi) access points (APs) for offloading data. This solution not only reduces congestion, but, due to caching, improves also user-perceived without overloading backhaul links APs. To encourage users...

Fog architectures at the network edge are becoming a popular research trend to provide elastic resources and services end-users, where processing capacity resides periphery as opposed traditional data-centers. Despite their momentum, control plane of these remains complex challenging implement. To enhance capability, in this paper, we propose use software defined networking (SDN). SDN moves logic off data devices onto external entities, controllers. We proof-of-concept implementation...

Small cells constitute a promising solution for managing the mobile data growth that has overwhelmed network operators. Local caching of popular content items at small cell base stations been proposed in order to decrease capacity-and hence cost- backhaul links connect these with core network. However, deriving optimal policy remains challenging open problem especially if one considers realistic parameters such as bandwidth limitation stations. The latter constraint is particularly important...

Heterogeneous cellular networks that overlay cache-endowed small-cell with macro-cell have emerged as a promising solution towards ultra-low latency, extra-high throughput, and sub-multiple energy consumption compared to the conventional paradigm. A technique further improve efficiency of such multi-tier is apply activation mechanisms, dynamically power on/off subset small-cells macro-cells. In this work, we show policy should be jointly derived caching policy, places popular content files...

Distributed caching architectures have been proposed for bringing content close to requesters, and the key problem is design algorithms reducing delivery delay, which determines an extent user Quality of Experience (QoE). This obtains interesting new twist with advent advanced layered-video encoding techniques such as Scalable Video Coding. In this paper, we show that finding configuration video layers minimizes delay a network operator NP-Hard, establish pseudopolynomial-time optimal...

One of the main challenges for mobile network operators today is efficient delivery VoD services. In order to satisfy their requirements, we must revolutionize way manage densely deployed resources in 5G wireless networks, and tailor operation video content delivery. Two key approaches that leverage density infrastructure are systematic usage in-network storage available BSs deployment smart caching policies, optimization techniques novel multi-tier, dense, heterogeneous structure systems....

In distributed software-defined networks (SDN), multiple physical SDN controllers, each managing a network domain, are implemented to balance centralized control, scalability and reliability requirements. such networking paradigm, controllers synchronize with other maintain logically view. Despite various proposals of controller architectures, most existing works only assume that view can be achieved some synchronization designs, but the question how exactly should maximize benefits under...

In-network caching constitutes a promising approach to reduce traffic loads and alleviate congestion in both wired wireless networks. In this article, we study the joint routing problem congestible networks of arbitrary topology (JoCRAT) as generalization previous efforts particular field. We show that JoCRAT extends many problems literature are intractable even with specific topologies and/or assumed unlimited bandwidth communications. To handle significant but challenging problem, develop...

Nowadays, there is a fast-paced shift from legacy telecommunication systems to novel software-defined network (SDN) architectures that can support on-the-fly reconfiguration, therefore, empowering advanced traffic engineering mechanisms. Despite this momentum, migration SDN cannot be realized at once especially in high-end networks of Internet service providers (ISPs). It expected ISPs will gradually upgrade their over period spans several years. In paper, we study the upgrading problem an...

Since the early development of Software-Defined Network (SDN) technology, researchers have been concerned with idea physical distribution control plane to address scalability and reliability challenges centralized designs. However, having multiple controllers managing network while maintaining a "logically-centralized" view brings additional challenges. One such challenge is how coordinate management decisions made by which usually achieved disseminating synchronization messages in...