Hiroyasu OBATA


A Priority Control Method for Media Access Control Method SP-MAC to Improve Throughput of Bidirectional Flows
Ryoma ANDO Ryo HAMAMOTO Hiroyasu OBATA Chisa TAKANO Kenji ISHIDA 
Publication:   
Publication Date: 2017/05/01
Vol. E100-D  No. 5  pp. 984-993
Type of Manuscript:  Special Section PAPER (Special Section on the Architectures, Protocols, and Applications for the Future Internet)
Category: 
Keyword: 
wireless LANmedia access controlsynchronization phenomena of coupled oscillatorsKuramoto-modelpriority
 Summary | Full Text:PDF(1.5MB)

Improvement of Throughput Prediction Scheme Considering Terminal Distribution in Multi-Rate WLAN Considering Both CSMA/CA and Frame Collision
Ryo HAMAMOTO Chisa TAKANO Hiroyasu OBATA Kenji ISHIDA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2016/12/01
Vol. E99-D  No. 12  pp. 2923-2933
Type of Manuscript:  Special Section PAPER (Special Section on Parallel and Distributed Computing and Networking)
Category: Wireless system
Keyword: 
wireless LANaccess pointmulti-ratethroughput predictionnetwork design
 Summary | Full Text:PDF(1.3MB)

Proposal for Designing Method of Radio Transmission Range to Improve Both Power Saving and Communication Reachability Based on Target Problem
Ryo HAMAMOTO Chisa TAKANO Hiroyasu OBATA Masaki AIDA Kenji ISHIDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/11/01
Vol. E99-B  No. 11  pp. 2271-2279
Type of Manuscript:  Special Section PAPER (Special Section on Deepening and Expanding of Information Network Science)
Category: 
Keyword: 
ad hoc networkpower savingreachabilitytarget problemtopology management
 Summary | Full Text:PDF(3MB)

A Proposal of Access Point Selection Method Based on Cooperative Movement of Both Access Points and Users
Ryo HAMAMOTO Tutomu MURASE Chisa TAKANO Hiroyasu OBATA Kenji ISHIDA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2015/12/01
Vol. E98-D  No. 12  pp. 2048-2059
Type of Manuscript:  Special Section PAPER (Special Section on Parallel and Distributed Computing and Networking)
Category: Wireless System
Keyword: 
mobile APAP selectionthroughputAP cooperativemoving
 Summary | Full Text:PDF(2MB)

SP-MAC: A Media Access Control Method Based on the Synchronization Phenomena of Coupled Oscillators over WLAN
Hiroyasu OBATA Ryo HAMAMOTO Chisa TAKANO Kenji ISHIDA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2015/12/01
Vol. E98-D  No. 12  pp. 2060-2070
Type of Manuscript:  Special Section PAPER (Special Section on Parallel and Distributed Computing and Networking)
Category: Wireless System
Keyword: 
wireless LANSP-MACsynchronization phenomena of coupled oscillatorsKuramoto modelmedia access control
 Summary | Full Text:PDF(1.5MB)

Evaluation of TCP Performance by Using High-Speed Communication Satellite WINDS and Large Earth Terminal
Hiroyasu OBATA Kenji ISHIDA Chisa TAKANO Junichi FUNASAKA Masaaki BESSHO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/10/01
Vol. E95-B  No. 10  pp. 3370-3373
Type of Manuscript:  LETTER
Category: Satellite Communications
Keyword: 
WINDSTCP PerformanceLarge Earth Terminal
 Summary | Full Text:PDF(253.8KB)

TCP-STAR: TCP Congestion Control Method for Satellite Internet
Hiroyasu OBATA Kenji ISHIDA Satoru TAKEUCHI Shouta HANASAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/06/01
Vol. E89-B  No. 6  pp. 1766-1773
Type of Manuscript:  PAPER
Category: Network
Keyword: 
TCP congestion control methodsatellite Internetthroughput
 Summary | Full Text:PDF(404.4KB)

Data Transfer Time by HTTP 1.0/1.1 on Asymmetric Networks Composed of Satellite and Terrestrial Links
Hiroyasu OBATA Kenji ISHIDA Junichi FUNASAKA Kitsutaro AMANO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/12/01
Vol. E85-B  No. 12  pp. 2895-2903
Type of Manuscript:  PAPER
Category: Internet
Keyword: 
web data transfer timeasymmetric networkssatellite linksterrestrial linkspipeline
 Summary | Full Text:PDF(652.5KB)

Evaluation of TCP Performance on Asymmetric Networks Using Satellite and Terrestrial Links
Hiroyasu OBATA Kenji ISHIDA Junichi FUNASAKA Kitsutaro AMANO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/06/01
Vol. E84-B  No. 6  pp. 1480-1487
Type of Manuscript:  Special Section PAPER (Special Issue on New Developments on QoS Technologies for Information Networks)
Category: 
Keyword: 
TCP performanceasymmetric networkssatellite linksterrestrial linksInternet
 Summary | Full Text:PDF(472.5KB)