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To cope with the rapidly expanding network scale and population, the heterogeneous content centric networks (HCCNs) have emerged, where the naming content can be shared among different sub-networks by using interest packets. However, In the HCCNs, as these sub-networks are managed by different operators and some sub-network may exhibit selfish behaviors due to the limited resource, how to design a...
Network virtualization has become one of the most prominent solutions that can efficiently deal with the dramatic increase of data demand in mobile networks. In order to allow multiple virtual networks to coexist in the same substrate network, the need for development of efficient virtual network embedding algorithms and techniques is imperative. The main purpose of this paper is to provide an optimization...
Information-Centric Networking (ICN) or Content-Centric Networking (CCN), as it also known for, has recently been proposed as an evolutionary framework to propel the current Internet network architecture towards a content oriented design. Mobility-aware caching can be deemed as indispensable for improving the experience of mobile users. To this end, we propose a proactive caching with redirection...
In this paper, we study the end-to-end delay of a linear multihop network with mobile relays located on the line connecting the source-destination pair. The network operates in an interference-limited environment, where the interfering signals are from nodes with positions following the Poisson point process (PPP) on a two-dimensional plane. Due to node mobilities, the relay nodes are assumed to move...
Installing a mobile sink on the public vehicle, which is a path-constrained vehicle, to collect data in a mobile sensor network can lower maintenance cost. However, immediately sending the data packet to the mobile sink when it arrives does not guarantee the shortest path, leading to high energy consumption. Meanwhile, immediately sending the data packet to the closest future position of the mobile...
We have proposed a prioritized random access (PRA) scheme, where each node indicates its access priority by differentiating the transmit power of preamble signatures and the eNodeB utilizes multiple detection thresholds to detect the prioritized preamble signatures. In this paper, in order to make the PRA scheme more robust, we enhance our previously proposed PRA scheme by investigating the effect...
Computation offloading has already shown itself to be successful for enabling resource-intensive applications on mobile devices. However, in view of immersive applications, the offloaded tasks could be duplicate when multiple users are in the same environment. In this paper, we consider the scenario that multiple mobile users offload duplicated computation tasks to a set of nearby Femto-Cloud called...
In this paper, statistical Quality of Service provisioning in next generation heterogeneous mobile cellular networks is investigated. To this aim, any active entity of the cellular network is regarded as a queuing system, whose statistical QoS requirements depend on the specific application. In this context, by quantifying the performance in terms of effective capacity, we introduce a lower bound...
Local caching with device-to-device (D2D) communications has been recently introduced as an effective scheme for reducing the average download time of the mobile terminals (MTs). The MTs first cache the files in their local memories and then exchange the files with each other within the vicinity via D2D communications. Prior works have largely overlooked MTs' heterogeneity in file preferences and...
The ever increasing video demands from mobile users have posed great challenges to cellular networks. To address this issue, video caching in radio access networks (RANs) has been recognized as one of the enabling technologies in future 5G mobile networks, which brings contents near the end-users, reducing the transmission cost of duplicate contents, meanwhile increasing the Quality-of-Experience...
Caching popular contents at the edge of wireless networks has recently emerged as a promising technology to improve the quality of service for mobile users, while balancing the peak-to-average transmissions over backhaul links. In contrast to existing works, where a central coordinator is required to design the cache placement strategy, we consider a distributed caching problem which is highly relevant...
Pushing and caching hold the promise of significantly increasing the throughput of content-centric wireless networks. However, the throughput gain of these techniques is limited by the buffer size of the receiver. To overcome this, this paper presents a Joint Pushing and Caching (JPC) method that jointly determines the contents to be pushed to, and to be removed from, the receiver buffer in each timeslot...
Voice over IP (VoIP) services are now offered on many mobile networks. However, delay spikes, which are sudden large increases in packet delay, affect the quality of VoIP on mobile networks. This paper proposes a quality of experience (QoE) indicator considering delay spikes. The QoE indicator combines a voice quality indicator such as ITU-T P.862 and the delay part of ITU-T G.107, which is a quality...
We propose a cloudlet network architecture to bring the computing resources from the centralized cloud to the edge. Thus, each User Equipment (UE) can communicate with its Avatar, a software clone located in a cloudlet, and can thus lower the end-to-end (E2E) delay. However, UEs are moving over time, and so the low E2E delay may not be maintained if UEs' Avatars stay in their original cloudlets. Thus,...
Cellular operators are continuously densifying their networks to cope with the ever-increasing capacity demand. Furthermore, an extreme densification phase for cellular networks is foreseen to fulfill the ambitious fifth generation (5G) performance requirements. Network densification improves spectrum utilization and network capacity by shrinking base stations' (BSs) footprints and reusing the same...
The development and evaluation of Vehicle-to-X (V2X) applications using mobile cellular networks by means of field tests is time consuming and expensive. Simulations can speed up the development and largely reduce evaluation costs. However, due to the complex nature of the network involved, it is quite difficult to be certain that the results obtained using simulation will actually match the observable...
Edge cloud is a promising architecture in order to address the latency problem in mobile cloud computing. However, as compared with remote clouds, edge clouds have limited computational resources, and higher operating costs. In this paper, we design policies which carry out the assignment of tasks that are generated at the mobile subscribers with edge clouds in an online fashion. The proposed policies...
Reducing startup delay of video streaming is important for attracting more users. In LTE networks, even though available bandwidth has increased, behavior of TCP, which has a slow start phase and estimates available capacity based on packet loss event, increases the startup delay of video streaming. To solve this issue, we design a proxy-based TCP rate control (PTRC) scheme for achieving low startup...
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