Research

Just for fun, try this Google Scholar Profile, though it sometimes yields some false positives (my name shares common sounds and English spellings with many other names from where I grew up. ) and misses some as well.

Publications

“Performability Analysis of a Metropolitan Area Cellular Network,” K. N. Oikonomou, R. K. Sinha, Byoung-Jo J. Kim, R. D. Doverspike, Proceedings of The 11th International Conference on Design of Reliable Communication Networks ( DRCN 2015 ) , Mar. 2015: This work is an expansion and refinement of the project below.

“Performability Analysis of a Metro Area Cellular Network,” K. N. Oikonomou, R. K. Sinha, Byoung-Jo J. Kim, R. D. Doverspike, Proceedings of The 12th INFORMS Telecommunications Conference, Mar. 2014: This work examines the statistical impact on cellular service by all the components used in building and running the radio access network. The failure rate of base stations, fiber runs, routers, interface cards, etc.. are considered as well as the coverage of base stations and user migration in the case of failures, to calculated the probability and the scope of service disruptions under various failure scenarios.

“Design and Optimization of Fiber-Optic Small-Cell Backhaul Based on an Existing Fiber-to-the-Node Residential Access Network,” C. Ranaweera, M. G. C. Resende, K. C. Reichmann, P. P. Iannone, P. S. Henry, Byoung-Jo Kim, P. D. Magill, K. N. Oikonomou, R. K. Sinha, and S. L. Woodward, IEEE Communications Magazine, September 2013: This work is about deploying a lot of small cells economically over existing fiber backhauls for residential broadband. It shows that "go where you can cheaply, then optimize" is better than "find ideal cell location and get backhaul to it."

" Directions for future cellular mobile network architecture," Byoung-Jo J. Kim, Paul S. Henry, First Monday, Volume 17, Number 12 - 3 December 2012 : This is a rather high level description of how the next generation cellular network ( often nebulously-called as 5G wireless network or 5G cellular network ) should be architectured, based on a lot of work and experience by me and others. The goal is to avoid the recurring mistakes in 3GPP designs and figure out the future mobile wireless network that is resilient to many unforeseen changes, and benefits users foremost. The history and present realities clearly point to a more dominant role by user/host devices of networking/handoff decisions and many other functions currently covered by 3GPP. Unfortunately however, most current large industry activities such as METIS, various 5G Forums are still missing the big picture and what ails the cellular architecture, while focusing on mostly air-interface topics (which are important of course, but that's not where we lack innovations and flexibility.) .

" A Wireless Channel Sounding System for Rapid Propagation Measurements ," Muhammad Nazmul Islam, Byoung-Jo J. Kim, Paul Henry, Eric Rozner, Proceedings on ICC 2013. : A quick prototyping of battery-powered multiple-transmitter multiple-receiver wideband channel sounding measurement system. It makes site surveying much more rapid and cheap, with the ultimate goal of "measure your environment instead of modeling it" by making measuring so cheap and easy.

"The Non-Wireless Part of Cellular Networks: What's With the Backhaul?," Peter Magill, Byoung-Jo "J" Kim, Proceedings of OFC/NFOEC 2011 : Analysis of the current state of affairs on backhaul networking in the current cellular network deployment in the US, and of course the challenges it presents.

”Metro-Ethernet-based Mobile Wireless Cellular Network Architecture: Scalability, Mobility, Interoperability and Minimizing Standards Dependency,” Byoung-Jo “J” Kim, N. K. Shankar, Yanjun Sun, in preparation for publication. : As Metro Ethernet dominates broadband backhaul for cellular networks, I examine utilizing the features of Ethernet for mobility and scaling of radio access networks. For various reasons, some good, some not so much, I decided not to publish this one.

”Analysis of Infrastructure Mesh for Broadband Wireless Systems,” Amit Saha, Byoung-Jo “J” Kim, N. K. Shankar, David Johnson, submitted for publication, 2004. Only abstract here, and a presentation to 802.16 Plenary: This proposes and analyzes, by very clever simulation, one-hop in-band relaying of cellular system that improves coverage immensely without sacrificing capacity. This was done in the context of WiMAX, and preceded LTE Relay activities by many years which no doubt was inspired by our work in WiMAX. This was not published in a paper form for reasons that I will not discuss here.

“Affordable Infrastructure for Deploying WiMAX Systems: Mesh vs. non-Mesh Techno-economic analysis”, Vinoth Gunasekaran, Fotios C. Harmantzis,

VTC 2005 Fall, Dallas, Sept. 2005. Note) I was involved in some stages of this work as a mentor , so I figured I'd list it here for informational purposes.

"Simple Mobility Support for IPsec Tunnel Mode", Byoung-Jo "J" Kim, Srividhya Srinivasan, VTC'03 Falll, October 2003" : The title kinda says it all, but this was the first implementation of MOBIKE-like tunnel endpoint mobility for IPsec VPNs. If IPSec tunnel is used for security anyways, why not get mobility as well. This was well before MOBIKE, but that appears to have been independently inspired.

"Frequency Assignment for Multi-Cell IEEE 802.11 Wireless Networks", Kin Leung, Byoung-Jo "J" Kim, invited paper at VTC'03 Fall. : Traffic and interference are explicitly considered to come up with approximately optimal frequency allocation scheme for Wi-Fi networks of large sizes.

"iCard – Foundation for A New Ubiquitous Computing Architecture", Zhimei Jiang Hui Luo Yu-Ngok Li Paul Henry, ICC 03, May 2003 Note) This one does not have my name on it for various reasons, but I was an active participant. : This is a "mobile router in a network interface card" idea, so that any device can have multi-interface, multi-ratio handoff/mobility. SoC well before it was popular. It seems Qualcomm took a similar approach for their chips, internally containing a functional networking host inside.

"Integrating Wireless LAN and Cellular Data for the Enterprise", Hui Luo, Zhimei Jiang, Byoung-Jo "J" Kim, Nemmara K. Shankaranarayanan, Paul S. Henry, IEEE Internet Computing Magazine, March/April '03, pp. 25-33 : Related to the above paper, but the tailored for enterprises that opt to provide multi network mobility for their own devices. This was not possible back then, and nobody offered such a service. Software implementation as intermediate driver, or hardware as a hidden router inside network cards were tried and discussed.

“Seamless mobility management based on proxy servers”, Z. Jiang, K, Leung, Byoung-Jo “J” Kim, P. Henry, Proceedings of WCNC 2002, Volume: 2 , Mar 2002, pp. 563 -568 : One of the earliest attempt at application-layer mobility using proxy servers. Nowadays, the right place for this should be the OS, but some recent applications have started doing something similar between Wi-Fi and cellular interfaces, since smartphones became popular.

"Performance Evaluation of MPEG-4 Video Streaming over Realistic EDGE Wireless Network", A. Basso, Byoung-Jo "J" Kim, Z. Jiang, Proceedings of Wireless Personal Multimedia Communications '02, Honolulu, HA, Nov. 2002 : We built a cellular channel and MAC state machine emulator to carry real video traffic and examined the effects of various channel impairments to video quality. Of course, EDGE was entirely inadequate for any useful video, but this was perhaps the first serious look into mobile video over cellular, way too early I guess.

"Internet Roaming: A Secure WLAN/3G Integration System for Enterprises", Hui Luo, Zhimei Jiang, Byoung-Jo “J” Kim, N. K. Shankar, Paul S. Henry, Proc. of Asia-Pacific Optical and Wireless Communications- Wireless and Mobile Communications II, 16-18 Oct. 2002, Shanghai, China, pp. 154-164: Similar but a bit different work compared to later (above) works of ours on this subject.

"Incorporating Proxy Services Into Wide Area Cellular IP Networks," Zhimei Jiang, Li Fung Chang, Byoung-Jo "J" Kim, and Kin K. Leung, Journal of Wireless Communications and Mobile Computing, July 2001: Perhaps the earliest work on the application layer mobility via proxy. In a way, this is fairly similar to the recent craze about "cloud" services or SDN-based application mobility, but I guess more narrowly focused on mobility rather than service portability, though it should be a simple extension. Another way too early ideas to attract enough commercial interest.

"A Network Service Providing Wireless Channel Information for Adaptive Mobile Applications: Part I: Proposal", Byoung-Jo "J" Kim, ICC 2001 and the presentation that goes along with it. : Perhaps the first attempt at providing useful channel quality related information to application layer so that they can adapt their behavior accordingly. Now it's rather common, like rate adapted video streaming, etc., albeit using active probing, rather than passive measurements provided by the network. There are many pros and cons to this, but the idea was probably too soon, 'cause I had hard time explaining the point of this to others. Recently, some new work from Google ('mobile throughput guidance') is trying out this idea as an in-band signaling inserted by network into TCP options.(draft-flinck-mobile-throughput-guidance) Nowadays, I am leaning more toward endpoint-only throughput estimations due to several practical reasons, and network side is not always much better than endpoints in timely accurate estimations. Like this one called MobileInsight.

"A subjective survey of user experience for data applications in future cellular wireless networks", Z. Jiang, H. Mason, Byoung-Jo "J" Kim, N. K. Shankaranarayanan, and P. Henry, SAINT 2001, San Diego, CA . : Many colleagues of mine suffered while using emulated mobile applications affected by various wireless impairments. This is probably the only such work using real people and also examining the possibility of using Thin Clients to overcome then-limited processing power of mobile devices with low performance radio interfaces.

"The AT&T Labs Broadband Fixed Wireless Field Experiment", Byoung-Jo "J" Kim, N. K. Shankaranarayanan, Paul S. Henry, Kevin Schlosser, and Thomas K. Fong, AT&T Labs-Research, IEEE Communications Magazine, Oct. 1999 : This describes one of the first, if not the first, large scale field trial of two way broadband fixed wireless residential Internet service. This was a great fun, and I learned a lot as first a helper and then soon as the lead of the whole project. I had to deal with high level network planning, link designs, arranging backhauls, software development for measurement and maintenance, and climbing roofs to install/check on antennas and amplifiers..

"Blind diversity equalization for short burst wireless communications", Byoung-Jo "J" Kim, Donald C. Cox, IEEE Trans. on Vehicular Technology, Vol. 49, No. 4, pp. 1235-1247, Jul. 2000 : This is part of my Ph.D. thesis work.

"Blind sequence estimation for short burst wireless communications", Byoung-Jo "J" Kim, Donald C. Cox,in the proceedings of ICUPC'97, San Diego, Sept. 1997: Also, part of my thesis work.

“Blind equalization for short burst wireless communications”, Byoung-Jo “J” Kim, Donald C. Cox, in the Proceedings of VTC’97, vol. 2, pp. 544-548, May 1997: Early results on my thesis topic.

Presentations, demos and panel talks, many invited, on the above technical papers and industry / technology directions on WLAN, WMAN, 3G, Mobile Networking, Wireless Systems, etc., at academic conferences, IEEE standards meetings, industry/trade organization events, university conferences, and AT&T internal/customer conferences/demos/meetings. Served as technical program committee members and reviewers on academic and industrial journals and conferences.

Numerous contributions to Wi-Fi Alliance, WiMAX Forum, 802.11i & 802.11k, 802.16j primarily in the areas of network architecture, multihop mesh networking, radio resource measurement / management and wireless network security.