Search results for "Communications"
showing 10 items of 3827 documents
A Double Auction Mechanism for Virtual Resource Allocation in SDN-based Cellular Network
2016
The explosively growing demands for mobile traffic service bring both challenges and opportunities to wireless net- works, among which, wireless network virtualization is proposed as the main evolution towards 5G. In this paper, we first propose a Software Defined Network (SDN) based wireless virtualization architecture for enabling multi-flow transmission in order to save capital expenses (CapEx) and operation expenses (OpEx) significantly with multiple Infrastructures Providers (InPs) and multiple Mobile Virtual Network Operators (MVNOs). We for- mulate the virtual resource allocation problem with diverse QoS requirements as a social welfare maximization problem with transaction cost. Due…
Sparsity-aware multiple relay selection in large multi-hop decode-and-forward relay networks
2016
In this paper, we propose and investigate two novel techniques to perform multiple relay selection in large multi-hop decode-and-forward relay networks. The two proposed techniques exploit sparse signal recovery theory to select multiple relays using the orthogonal matching pursuit algorithm and outperform state-of-the-art techniques in terms of outage probability and computation complexity. To reduce the amount of collected channel state information (CSI), we propose a limited-feedback scheme where only a limited number of relays feedback their CSI. Furthermore, a detailed performance-complexity tradeoff investigation is conducted for the different studied techniques and verified by Monte …
Energy Efficient Optimization for Wireless Virtualized Small Cell Networks With Large-Scale Multiple Antenna
2017
Wireless network virtualization is envisioned as a promising framework to provide efficient and customized services for next-generation wireless networks. In wireless virtualized networks (WVNs), limited radio resources are shared among different services providers for providing services to different users with heterogeneous demands. In this paper, we propose a resource allocation scheme for an orthogonal frequency division multiplexing-based WVN, where one small cell base station equipped with a large number of antennas serves the users with different service requirements. In particular, with the objective to obtain the energy efficiency in the uplink, a joint power, subcarrier, and antenn…
Underwater Multirobot Cooperative Intervention MAC Protocol
2020
This work introduces a Medium Access Control (MAC) protocol designed to allow a group of underwater robots that share a wireless communication channel to effectively communicate with each other. The goal of the Underwater Multirobot Cooperative Intervention MAC (UMCI-MAC) protocol presented in this work is to minimize the end to end delay and the jitter. The access to the medium in UMCI-MAC follows a Time Division Multiple Access (TDMA) strategy which is arbitrated by a master, which also has the capability to prioritize the transmission of some nodes over the rest of the network. Two experiments have been carried out with a team of four Autonomous Underwater Vehicles (AUV) in order to comp…
Trajectory Design and Resource Allocation for Multi-UAV Networks : Deep Reinforcement Learning Approaches
2023
The future mobile communication system is expected to provide ubiquitous connectivity and unprecedented services over billions of devices. The unmanned aerial vehicle (UAV), which is prominent in its flexibility and low cost, emerges as a significant network entity to realize such ambitious targets. In this work, novel machine learning-based trajectory design and resource allocation schemes are presented for a multi-UAV communications system. In the considered system, the UAVs act as aerial Base Stations (BSs) and provide ubiquitous coverage. In particular, with the objective to maximize the system utility over all served users, a joint user association, power allocation and trajectory desi…
Compression and load balancing for efficient sparse matrix-vector product on multicore processors and graphics processing units
2021
We contribute to the optimization of the sparse matrix-vector product by introducing a variant of the coordinate sparse matrix format that balances the workload distribution and compresses both the indexing arrays and the numerical information. Our approach is multi-platform, in the sense that the realizations for (general-purpose) multicore processors as well as graphics accelerators (GPUs) are built upon common principles, but differ in the implementation details, which are adapted to avoid thread divergence in the GPU case or maximize compression element-wise (i.e., for each matrix entry) for multicore architectures. Our evaluation on the two last generations of NVIDIA GPUs as well as In…
A Patchworking Process : Coming Together under Pandemic Conditions for Collaborative, Caring Scholarship
2021
In the context of the COVID-19 outbreak, the authors in this special issue came together within the Massive Microscopic Sensemaking (MMS) writing project in the spring of 2020. Collectively grappling with the impact of the extended pandemic, each paper in this issue touches on experiences of social isolation, making do, and a technological reaching out under conditions of a public health crisis. This introduction describes the issue’s ‘patchwork’ development which reflects an attempt to break from traditions of academic scholarship that often fail to recognize the value of emergent, and therefore uncertain, cross-disciplinary and collective work.
Listening to and Living With Networked Media During a Pandemic
2021
This article explores mediated listening from the perspective of intimacy during the first weeks of the coronavirus pandemic. The theoretical frame builds on the literature on listening and presence in mediated environments, audience engagement, and intimacy as meaningful connections. Methodologically, the study is connective ethnography, and the data was collected by collaborative autoethnography. Our data show that listening was an individual sensemaking strategy of the outside world and a means to form connectedness. Threading between different screens on digital platforms caused the collapse of public and private contexts, and through these, particular types of intimacy arose. When the …
Towards a more dynamic stakeholder model : Acknowledgning multiple issue arenas
2010
Purpose – The paper suggest that corporate communications is becoming less predictable as interaction with stakeholders is moving from organizational control toward ‘issue arenas’, places of interaction where an issue is discussed by stakeholders and organizations both online and within the traditional media. The role of corporate communications and public relations is broadening beyond the traditional relationship management to issue arena monitoring. Design/methodology/approach – Theoretical approach with six axioms suggested. Findings – Several central theories of corporate communications are combined with issues management and stakeholder theory to argue for a multiplicity of new ‘issue…
Conquering the liminal space : Strategic social media influencer communication in the Finnish public sector during the COVID-19 pandemic
2022
Public sector organisations have traditionally used mass media and their own communication channels to communicate urgent matters to citizens. However, the COVID-19 pandemic has forced these organisations to look for new communication approaches. In Finland, several public-sector organisations collaborated with social media influencers (SMIs) to maximise their efforts in communicating about the measures needed to constrain the spread of the virus. Using a multiple-case study design, this chapter scrutinises four public-sector organisations and their collaboration with SMIs during the pandemic in 2020. We found that public organisations turned to SMIs through influencer marketing and influen…