946 research outputs found
Linux XIA: an interoperable meta network architecture to crowdsource the future Internet
With the growing number of proposed clean-slate redesigns of the Internet, the need for a medium that enables all stakeholders to participate in the realization, evaluation, and selection of these designs is increasing. We believe that the missing catalyst is a meta network architecture that welcomes most, if not all, clean-state designs on a level playing field, lowers deployment barriers, and leaves the final evaluation to the broader community. This paper presents Linux XIA, a native implementation of XIA [12] in the Linux kernel, as a candidate. We first describe Linux XIA in terms of its architectural realizations and algorithmic contributions. We then demonstrate how to port several distinct and unrelated network architectures onto Linux XIA. Finally, we provide a hybrid evaluation of Linux XIA at three levels of abstraction in terms of its ability to: evolve and foster interoperation of new architectures, embed disparate architectures inside the implementation’s framework, and maintain a comparable forwarding performance to that of the legacy TCP/IP implementation. Given this evaluation, we substantiate a previously unsupported claim of XIA: that it readily supports and enables network evolution, collaboration, and interoperability—traits we view as central to the success of any future Internet architecture.This research was supported by the National Science Foundation under awards CNS-1040800, CNS-1345307 and CNS-1347525
Performance Comparison Between VoLTE and non-VoLTE Voice Calls During Mobility in Commercial Deployment: A Drive Test-Based Analysis
The optimization of network performance is vital for the delivery of services
using standard cellular technologies for mobile communications. Call setup
delay and User Equipment (UE) battery savings significantly influence network
performance. Improving these factors is vital for ensuring optimal service
delivery. In comparison to traditional circuit-switched voice calls, VoLTE
(Voice over LTE) technology offers faster call setup durations and better
battery-saving performance. To validate these claims, a drive test was carried
out using the XCAL drive test tool to collect real-time network parameter
details in VoLTE and non-VoLTE voice calls. The findings highlight the analysis
of real-time network characteristics, such as the call setup delay calculation,
battery-saving performance, and DRX mechanism. The study contributes to the
understanding of network optimization strategies and provides insights for
enhancing the quality of service (QoS) in mobile communication networks.
Examining VoLTE and non-VoLTE operations, this research highlights the
substantial energy savings obtained by VoLTE. Specifically, VoLTE saves
approximately 60.76% of energy before the Service Request and approximately
38.97% of energy after the Service Request. Moreover, VoLTE to VoLTE calls have
a 72.6% faster call setup delay than non-VoLTE-based LTE to LTE calls, because
of fewer signaling messages required. Furthermore, as compared to non-VoLTE to
non-VoLTE calls, VoLTE to non-VoLTE calls offer an 18.6% faster call setup
delay. These results showcase the performance advantages of VoLTE and reinforce
its potential for offering better services in wireless communication networks.Comment: Accepted for presentation and Publication on the IEEE 10th
International Conference on Electrical Engineering, Computer Science and
Informatics (EECSI 2023
LTE puheratkaisujen analyysi ja testaaminen
The goal of this thesis is to assess the long term evolution (LTE) voice solutions and to analyse the performance testing and measurement results. The main focus is on circuit switched fallback (CSFB) and single voice call continuity (SRVCC). Thesis is divided into two parts, a literature study and the performance testing results. The theoretical approach is been supplemented by the real measurement results. This gives a more dimensional view for the theoretical part. The CSFB measurements are based on interoperability tests executed by Microsoft Mobile Oy and published measurement results from Qualcomm. The SRVCC results are based on published measurements from Ericsson.
The measurement results show that with LTE it is possible to gain similar service level as with current legacy network. Especially it is expected that with new enhancements performance figures will improve. Important is to maintain at least the same service level for subscriber as what they currently have. Even though it is essential to do testing in lab environment to gain information how UE and networks are working together. Still the real results are received by measuring the live networks. There are already recommendations available for how to optimize for example network configuration to decrease the CSFB call setup delay.
The study indicates the significant changes that are ongoing and will come in mobile telecommunication. It describes the LTE voice solution techniques and features that are used to handle the call continuity when user equipment (UE) is moving between 2G/3G and LTE networks. It outlines the importance of usability and importance of nationwide common rules as standards
CapEst: A Measurement-based Approach to Estimating Link Capacity in Wireless Networks
Estimating link capacity in a wireless network is a complex task because the
available capacity at a link is a function of not only the current arrival rate
at that link, but also of the arrival rate at links which interfere with that
link as well as of the nature of interference between these links. Models which
accurately characterize this dependence are either too computationally complex
to be useful or lack accuracy. Further, they have a high implementation
overhead and make restrictive assumptions, which makes them inapplicable to
real networks.
In this paper, we propose CapEst, a general, simple yet accurate,
measurement-based approach to estimating link capacity in a wireless network.
To be computationally light, CapEst allows inaccuracy in estimation; however,
using measurements, it can correct this inaccuracy in an iterative fashion and
converge to the correct estimate. Our evaluation shows that CapEst always
converged to within 5% of the correct value in less than 18 iterations. CapEst
is model-independent, hence, is applicable to any MAC/PHY layer and works with
auto-rate adaptation. Moreover, it has a low implementation overhead, can be
used with any application which requires an estimate of residual capacity on a
wireless link and can be implemented completely at the network layer without
any support from the underlying chipset
Context-Awareness Enhances 5G Multi-Access Edge Computing Reliability
The fifth generation (5G) mobile telecommunication network is expected to
support Multi- Access Edge Computing (MEC), which intends to distribute
computation tasks and services from the central cloud to the edge clouds.
Towards ultra-responsive, ultra-reliable and ultra-low-latency MEC services,
the current mobile network security architecture should enable a more
decentralized approach for authentication and authorization processes. This
paper proposes a novel decentralized authentication architecture that supports
flexible and low-cost local authentication with the awareness of context
information of network elements such as user equipment and virtual network
functions. Based on a Markov model for backhaul link quality, as well as a
random walk mobility model with mixed mobility classes and traffic scenarios,
numerical simulations have demonstrated that the proposed approach is able to
achieve a flexible balance between the network operating cost and the MEC
reliability.Comment: Accepted by IEEE Access on Feb. 02, 201
Federated Robust Embedded Systems: Concepts and Challenges
The development within the area of embedded systems (ESs) is moving rapidly, not least due to falling costs of computation and communication equipment. It is believed that increased communication opportunities will lead to the future ESs no longer being parts of isolated products, but rather parts of larger communities or federations of ESs, within which information is exchanged for the benefit of all participants. This vision is asserted by a number of interrelated research topics, such as the internet of things, cyber-physical systems, systems of systems, and multi-agent systems. In this work, the focus is primarily on ESs, with their specific real-time and safety requirements.
While the vision of interconnected ESs is quite promising, it also brings great challenges to the development of future systems in an efficient, safe, and reliable way. In this work, a pre-study has been carried out in order to gain a better understanding about common concepts and challenges that naturally arise in federations of ESs. The work was organized around a series of workshops, with contributions from both academic participants and industrial partners with a strong experience in ES development.
During the workshops, a portfolio of possible ES federation scenarios was collected, and a number of application examples were discussed more thoroughly on different abstraction levels, starting from screening the nature of interactions on the federation level and proceeding down to the implementation details within each ES. These discussions led to a better understanding of what can be expected in the future federated ESs. In this report, the discussed applications are summarized, together with their characteristics, challenges, and necessary solution elements, providing a ground for the future research within the area of communicating ESs
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