Due to inflexibility, design and control of existing networks are very complex. Therefore, SDN aims to separate control and data planes clearly, which is an innovative and effective approach to this problem. With SDN, a service provider can adjust the settings of a network according to various requirements dynamically and in a timely fashion. This feature is especially suitable…
Tags: 4g LTE
Performance of a radiation pattern steering on-body gateway antenna for on-body and off-body propagation
Antennas in Body Area Networks (BAN) should be designed according to the link they are expected to form. In most of the systems, an on-body gateway collects data frames from other on-body sensors and relays them to an off-body gateway, realizing two different modes of operation, on-body and off-body. For such a device, the on-body link and the off-body link have different radiation pattern requirements.…
An optimal application-aware resource block scheduling in LTE
In this paper, we introduce an approach for application-aware resource block scheduling of elastic and inelastic adaptive real-time traffic in fourth generation Long Term Evolution (LTE) systems. The users are assigned to resource blocks. A transmission may use multiple resource blocks scheduled over frequency and time. In our model, we use logarithmic and sigmoidal-like utility…
A fast AGC method for multimode zero-IF/sliding-IF WPAN/BAN receivers
This paper presents a fast mixed-signal automatic gain control (AGC) method for zero-IF/sliding-IF receivers used in wireless personal and body-area networks (WPAN/BAN). The preamble defined in Bluetooth low energy (BLE)/802.15.4 /802.15.6 specifications are as low as 1 Byte. It is a tough challenge for the zero-IF/sliding-IF receivers to perform AGC training, frequency synchronization and symbol timing estimation. By detecting the…
Software defined and virtualized wireless access in future wireless networks: scenarios and standards
Future wireless networks are expected to provide augmented and data-intensive services in a multi-vendor multi-proprietor scenario. This scenario introduces relevant challenges to the networkinginfrastructure, especially in terms of flexibility and interoperability, that could be addressed by extending the concept of Virtualization and Software Defined Networking (SDN) to the wireless or wired-cum-wireless world. This paper provides a review of the perspectives to the…
Interference management in software-defined mobile networks
Software-Defined Networking promises to deliver more flexible and manageable networks by providing a clear decoupling between control plane and data plane and by implementing the latter in a logically centralized controller. However, if such principles are to be applied also to wireless networks, new primitives and abstractions capable of providing programmers with a global view of the networkcapturing channel quality and…
Energy-aware allocation of reliable Virtual Software Defined Networks
The Internet is now present in our personal and professional life, where reliability and green communications are still open issues to be addressed. Usually, clients establish Service Level Agreements (SLAs) with their Internet Service Providers (ISPs), including parameters of reliability and bandwidth. On the other hand, the ISPs aim to maximize their profit by establishing…
Scalable resilience for Software-Defined Networking using Loop-Free Alternates with loop detection
In this paper we propose a novel resilience scheme for OpenFlow-based Software-Defined Networking(SDN). To forward packets in line speed, OpenFlow switches store their flow tables in expensive, limited TCAM due to which the stored tables cannot be large. Most resilience mechanisms require additional entries thus the implementation in OpenFlow may quickly exceed the available TCAM. Loop-Free Alternates…
Adaptive TTCM Aided Near-Instantaneously Dynamic Network Coding for Cooperative Cognitive Radio Networks
An Adaptive Dynamic Network Coding (ADNC) scheme conceived for Cooperative Cognitive Radio (CCR) is proposed for devising a novel ADNC-CCR system. The system is designed for supporting communications between multiple Primary Users (PUs) and a common Base Station (BS), where the independent source information is transmitted from the PUs to the BS with the aid…
Social-Aware Resource Allocation for Device-to-Device Communications Underlaying Cellular Networks
Device-to-device (D2D) communication is a vital component for the next generation cellular network to bring hop gains, improve spectral reuse, and enhance system capacity. These benefits depend on efficiently solving several technical problems, among which resource allocation that shares spectrum resources between cellular users and D2D pairs is critically challenging. We propose a social-aware D2D…