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Eng Hwee Ong

Bio: Eng Hwee Ong is an academic researcher from Nokia. The author has contributed to research in topics: Wireless network & Quality of service. The author has an hindex of 17, co-authored 44 publications receiving 953 citations. Previous affiliations of Eng Hwee Ong include University of Newcastle & Newcastle University.

Papers
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Proceedings ArticleDOI
Eng Hwee Ong1, Jarkko Kneckt1, Olli Alanen2, Zheng Chang2, Toni Huovinen2, Timo Nihtila2 
01 Sep 2011
TL;DR: This paper introduces the key mandatory and optional PHY features, as well as the MAC enhancements of 802.11ac over the existing802.11n standard in the evolution towards higher data rates, and demonstrates that hybrid A-MSDU/A-MPDU aggregation yields the best performance for both 802.
Abstract: The IEEE 802.11ac is an emerging very high throughput (VHT) WLAN standard that could achieve PHY data rates of close to 7 Gbps for the 5 GHz band. In this paper, we introduce the key mandatory and optional PHY features, as well as the MAC enhancements of 802.11ac over the existing 802.11n standard in the evolution towards higher data rates. Through numerical analysis and simulations, we compare the MAC performance between 802.11ac and 802.11n over three different frame aggregation mechanisms, viz., aggregate MAC service data unit (A-MSDU), aggregate MAC protocol data unit (A-MPDU), and hybrid A-MSDU/A-MPDU aggregation. Our results indicate that 802.11ac with a configuration of 80MHz and single (two) spatial stream(s) outperforms 802.11n with a configuration of 40 MHz and two spatial streams in terms of maximum throughput by 28% (84%). In addition, we demonstrate that hybrid A-MSDU/A-MPDU aggregation yields the best performance for both 802.11n and 802.11ac devices, and its improvement is a function of the maximum A-MSDU size.

221 citations

Patent
14 Sep 2012
TL;DR: In this paper, the authors describe a method to improve the discovery of wireless networks by transmitting, by an apparatus, one or more wireless discovery request messages to discover a wireless network matching one of the predetermined characteristics.
Abstract: Method, apparatus, and computer program product embodiments of the invention are disclosed to improve the discovery of wireless networks. In example embodiments of the invention, a method comprises: transmitting, by an apparatus, one or more wireless discovery request messages to discover a wireless network matching one or more predetermined characteristics; receiving by an apparatus, from one or more wireless devices, zero or more wireless responses to the one or more wireless discovery request messages, and transmitting by the apparatus, a wireless message including an indication that the apparatus will not listen to further wireless responses.

58 citations

Patent
Eng Hwee Ong1, Jarkko Kneckt1
31 Aug 2011
TL;DR: In this paper, a method, an apparatus, and a computer program are presented for carrying out channel reservations in a wireless communication system, where a communication apparatus initiates a preliminary channel reservation procedure initiating related to a spatial multiplexing group transmission.
Abstract: A method, an apparatus, and a computer program are presented for carrying out channel reservations in a wireless communication system. A communication apparatus initiates a preliminary channel reservation procedure initiating related to a spatial multiplexing group transmission. The communication apparatus is caused to transmit during the preliminary channel reservation procedure a reservation request message announcing a preliminary group reservation on the channel. Upon completed preliminary channel reservation procedure, the communication apparatus is caused to utilize the preliminary group reservation by causing transmission of a frame on the reserved channel according to the spatially multiplexed wireless communication.

54 citations

Patent
27 Oct 2011
TL;DR: In this paper, the authors describe a method to improve the discovery of wireless networks by listening by an apparatus, to wireless discovery request messages transmitted by one or more wireless devices, and modifying transmission by the apparatus, of its own wireless discovery response messages based on at least one of the discovered request messages or the discovered response messages.
Abstract: Method, apparatus, and computer program product embodiments of the invention are disclosed to improve the discovery of wireless networks. In example embodiments of the invention, a method comprises: listening by an apparatus, to wireless discovery request messages transmitted by one or more wireless devices; listening by the apparatus, to wireless discovery response messages from one or more other wireless devices; and modifying transmission by the apparatus, of one or more of its own wireless discovery request messages based on at least one of the wireless discovery request messages listened to or the wireless discovery response messages listened to.

51 citations

Patent
Eng Hwee Ong1, Jarkko Kneckt1
14 Feb 2011
TL;DR: In this paper, a resource request includes a request to reserve the first radio channel between the requesting device and the responding device, and a resource response comprises status information indicative of status of at least one second radio channel not requested to be reserved by the requesting devices.
Abstract: Methods and apparatuses for indicating status of radio resources in a wireless network are provided. A requesting device transmits a resource request on a first radio channel to a responding device. The resource request includes a request to reserve the first radio channel between the requesting device and the responding device. The responding device transmits a resource response on the first radio channel in response to the resource request. The resource response comprises status information indicative of status of at least one second radio channel not requested to be reserved by the requesting device.

51 citations


Cited by
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Journal ArticleDOI
01 May 1975
TL;DR: The Fundamentals of Queueing Theory, Fourth Edition as discussed by the authors provides a comprehensive overview of simple and more advanced queuing models, with a self-contained presentation of key concepts and formulae.
Abstract: Praise for the Third Edition: "This is one of the best books available. Its excellent organizational structure allows quick reference to specific models and its clear presentation . . . solidifies the understanding of the concepts being presented."IIE Transactions on Operations EngineeringThoroughly revised and expanded to reflect the latest developments in the field, Fundamentals of Queueing Theory, Fourth Edition continues to present the basic statistical principles that are necessary to analyze the probabilistic nature of queues. Rather than presenting a narrow focus on the subject, this update illustrates the wide-reaching, fundamental concepts in queueing theory and its applications to diverse areas such as computer science, engineering, business, and operations research.This update takes a numerical approach to understanding and making probable estimations relating to queues, with a comprehensive outline of simple and more advanced queueing models. Newly featured topics of the Fourth Edition include:Retrial queuesApproximations for queueing networksNumerical inversion of transformsDetermining the appropriate number of servers to balance quality and cost of serviceEach chapter provides a self-contained presentation of key concepts and formulae, allowing readers to work with each section independently, while a summary table at the end of the book outlines the types of queues that have been discussed and their results. In addition, two new appendices have been added, discussing transforms and generating functions as well as the fundamentals of differential and difference equations. New examples are now included along with problems that incorporate QtsPlus software, which is freely available via the book's related Web site.With its accessible style and wealth of real-world examples, Fundamentals of Queueing Theory, Fourth Edition is an ideal book for courses on queueing theory at the upper-undergraduate and graduate levels. It is also a valuable resource for researchers and practitioners who analyze congestion in the fields of telecommunications, transportation, aviation, and management science.

2,562 citations

Journal ArticleDOI
TL;DR: A general probable 5G cellular network architecture is proposed, which shows that D2D, small cell access points, network cloud, and the Internet of Things can be a part of 5G Cellular network architecture.
Abstract: In the near future, i.e., beyond 4G, some of the prime objectives or demands that need to be addressed are increased capacity, improved data rate, decreased latency, and better quality of service. To meet these demands, drastic improvements need to be made in cellular network architecture. This paper presents the results of a detailed survey on the fifth generation (5G) cellular network architecture and some of the key emerging technologies that are helpful in improving the architecture and meeting the demands of users. In this detailed survey, the prime focus is on the 5G cellular network architecture, massive multiple input multiple output technology, and device-to-device communication (D2D). Along with this, some of the emerging technologies that are addressed in this paper include interference management, spectrum sharing with cognitive radio, ultra-dense networks, multi-radio access technology association, full duplex radios, millimeter wave solutions for 5G cellular networks, and cloud technologies for 5G radio access networks and software defined networks. In this paper, a general probable 5G cellular network architecture is proposed, which shows that D2D, small cell access points, network cloud, and the Internet of Things can be a part of 5G cellular network architecture. A detailed survey is included regarding current research projects being conducted in different countries by research groups and institutions that are working on 5G technologies.

1,899 citations

Book ChapterDOI
11 Dec 2012

1,704 citations

Proceedings ArticleDOI
25 Jun 2013
TL;DR: The main observation is that natural human mobility, when combined with PHY layer information, can help in accurately estimating the angle and distance of a mobile device from an wireless access point (AP).
Abstract: Despite of several years of innovative research, indoor localization is still not mainstream. Existing techniques either employ cumbersome fingerprinting, or rely upon the deployment of additional infrastructure. Towards a solution that is easier to adopt, we propose CUPID, which is free from these restrictions, yet is comparable in accuracy. While existing WiFi based solutions are highly susceptible to indoor multipath, CUPID utilizes physical layer (PHY) information to extract the signal strength and the angle of only the direct path, successfully avoiding the effect of multipath reflections. Our main observation is that natural human mobility, when combined with PHY layer information, can help in accurately estimating the angle and distance of a mobile device from an wireless access point (AP). Real-world indoor experiments using off-the-shelf wireless chipsets confirm the feasibility of CUPID. In addition, while previous approaches rely on multiple APs, CUPID is able to localize a device when only a single AP is present. When a few more APs are available, CUPID can improve the median localization error to 2.7m, which is comparable to schemes that rely on expensive fingerprinting or additional infrastructure.

384 citations

Book ChapterDOI
07 Feb 2008
TL;DR: In this article, product definition for broadband wireless systems technology drivers Evolving Wireless Broadband Market Segments Open Systems and Intelligence at the Edge Radio Network System Engineering References are discussed. But the focus of this paper is not on wireless networks.
Abstract: This chapter contains sections titled: Product Definition for Broadband Wireless Systems Technology Drivers Evolving Wireless Broadband Market Segments Open Systems and Intelligence at the Edge Radio Network System Engineering References

293 citations