ICT and Climate Change


Cyber creative institute is continuing research on Climate Change from ICT technological point of view.

Title A Future Prospect of Green House Gas Reduction by Telecommuting
Authors Hideki Nakane, Susumu Shirasawa
Published This site
Date 15 June 2010
Abstract Telecommuting is recognized as a work style conducible not only for work life balance improvement but also for reducing green house gasses (GHGs) emission to mitigate climate change of the Earth. This effectiveness is from decreasing transport of men and energy consumption in business offices literally by telecommuting. 
On the other hand, progress of doing business computing through the network clouds makes telecommuting fade into the background as the factor of increasing carbon dioxide(CO2), because both doing business in the office and telecommuting become equivalent to consume energy by using network clouds.
This paper is discussing about the decreasing amount of CO2 emission through promotion of telecommuting, based on the figure in year 2010, and forecasting it in the year 2020, and 2030, respectively.
It is concluded that the more promotion of telecommuting is necessary to keep decreasing amount of CO2 while the productive-age (older than 20years old and younger than 65years old) population in Japan will decrease through these years.



High performance IP-technologies


Cyber Creative Institute is continuing research on IP more advanced technology.

Title Scheme for Estimating ADSL Link Capacity based on Delay Measurements of Different Length Packets
Authors Makoto Aoki and Eiji Oki
Published Globecom 2010, Miami, FL, USA, Dec 6-10, 2010.
Date 9 December 2010
Abstract This paper proposes a practical scheme that can estimate ADSL link rates. The proposed scheme allows us to estimate ADSL link rates from measurements made at the NOC using existing communications protocols and network node facilities; it imposes no heavy traffic overhead. The proposed scheme consists of two major steps. The first step is to collect measured data of round trip times (RTT) for both long and short packets to find their minimum values of RTTs, i.e. those do not include queuing delays. The RTT measurements are simply conducted by sending Internet Control Message Protocol (ICMP) echo request messages. The second step is to estimate the ADSL down- and up-link rates by using the difference in RTT between long and short packets and the experimentally-obtained correlated relationships between ADSL down- and up-link rates. RTTs are experimentally measured for an IP network.
Title Measurement Scheme for One-way Delay Variation with Detection and Removal of Clock Skew
Authors Makoto Aoki, Eiji Oki, and Roberto Rojas-Cessa
Published ETRI Journal, vol.32, no.6, Dec. 2010, pp.854-862
Date 9 December 2010
Abstract One-way delay variation (OWDV) has become increasingly of interest to researchers as a way to evaluate network state and service quality. Many schemes for OWDV measurement require the clock synchronization through GPS or the Network Time Protocol (NTP). In clock-synchronized approaches, the accuracy of OWDV measurement depends on the accuracy of clock synchronization. GPS provides highly accurate clock synchronization. However, the deployment of GPS on legacy network equipment might be slow and costly. This paper proposes a method for measuring OWDV that dispenses with clock synchronization. The clock synchronization problem is mainly caused by clock skew. The proposed approach is based on the measurement of inter-packet delay and accumulated OWDV. This paper shows the performance of the proposed scheme via simulations and through experiments in a VoIP network. The presented simulation and measurement results indicate that clock skew can be efficiently measured and removed and that OWDV can be measured without requiring clock synchronization.
Title Scheme to Measure One-way Delay Variation with Detection and Removal of Clock Skew
Authors Makoto Aoki, et al.,
Published Proc. International Conference on High Performance Switching and Routing (HPSR) 2010, pp. 165-170, Richardson, Texas, USA, June 13-16, 2010.
Date June 2010
Abstract One-Way Delay Variation (OWDV) has played a key role in evaluating network state and service quality, especially for real-time and streaming services such as VoIP and video. Many schemes for OWDV measurements require clock synchronization at the source and destination through Global-Positioning System (GPS) or the Network Time Protocol (NTP). The accuracy of the measurement of OWDV depends on the achieved accuracy of clock synchronization. GPS provides high-accuracy clock synchronization. However, the deployment of GPS on legacy network equipment might be slow and costly. This paper describes a method for measuring OWDV without clock synchronization and the performance of the proposed scheme via simulation and through experimentation in a VoIP network.



Mobile and Wireless Technologies


Cyber Creative Institute is also continuing research on mobile and wireless technology since its founding.

Title WAVE design for next DSRC applications
Authors Tsutomu Tsuboi1, Jun Yamada1, Naoki Yamauchi1,Noriaki Yoshikawa2 1Automotive Semiconductor Business Unit, Renesas Technology Corp., 2Cyber Creative Institute
Date 21-23 APRIL 2010
Abstract In the area of wireless communication , especially DSRC (Dedicated Short Range Communication) , WAVE based on IEEE802.11p becomes hot topics in world wide i.e. ARIB in Japan, C2C-CC (Car to Car Communication Consortium) in Europe , IntelliDrive1in USA. In this paper provides practical WAVE system guide line especially for automotive network applications including existing network technology such as 3G or WiMAX. Authors provide more practical method for cell design and traffic design for next DSRC at the frequency band 5.9GHz ,2.5GHz and UHF (700-800MHz) . And authors provide field feasibility test with our previous WAVE evaluation system which has been used for WAVE video streaming transmission among OBUs (On Board Units) and RSUs (Rode Side Units).


Title Next Generation UHF Band WAVE System and Architecture Design
Authors Tsutomu Tsuboi1 Noriaki Yoshikawa2
Hitachi Ltd.1 Cyber Creative Institute2
Published Information Processing Society of Japan (IPSJ)-ITS-RSS
Date 2 March 2011
Abstract This paper describes WAVE (Wireless Access in Vehicle Environment) system design especially for 700MHz frequency band. This WAVE system design is approached by cost performance of WAVE system which achieves service requirements for proper data rate and coverage.
Title The Theoretical Model for Packet Data Collision by Hidden Terminals for WAVE and DSRC
Authors Tsutomu Tsuboi1  Izuru Yamada2 Hiroki Ichikawa2 Noriaki Yoshikawa3
Hitachi Ltd.1 Hitachi Information and Communication Engineering Ltd.2
Cyber Creative Institute3
Published Information Processing Society of Japan (IPSJ)-ITS-RSS
Date 2 March 2011
Abstract This paoer describes WAVE/ DSRC system optimization for each required data rate with appropriate transmission power and packet loss rate with hidden terminal condition. Authors provide theoretical analysis for packet collisions formulas by hidden terminal conditions.
Title WAVE System Architecture Design in Urban Area
Authors Tsutomu Tsuboi1 Noriaki Yoshikawa2
1Hitachi Ltd., Smart City Business Management Division
2Cyber Creative Institute
Published ITS Telecommunications 2011(ITST2011)  ,St. Petersburg, Russia
Date 23 August 2011
Abstract This paper describes WAVE (Wireless Access in Vehicle Environment) system design especially for Urban area. WAVE technology is currently is developing in worldwide and there are standardizations under IEEE, ETSI equency band is assigned in 5.9GHz in Europe and north America. In Japan, there are 5.8GHz and next 700MHz plan. In general WAVE radio range is not so much long distance such as mobile phone but achieves high speed access network in dedicated short distance, therefore it is also called DSRC . Therefore authors describe how to use WAVE and mobile communication architecture for vehicular wireless communications, especially in urban area.
Title Highly Sophisticated Network System using Micro Air Vehicles and Wireless Networks for Enhanced Safety against Natural Disasters
Authors Satoshi Fujii1, Noriaki Yoshikawa2, Kenzo Nonami1
1 Chiba University  2 Cyber Creative Institute
Published The International Conference on Intelligent Unmanned Systems 2011(ICIUS2011) at Chiba University
Date 2 November 2011
Abstract This paper presents the concept of a highly sophisticated network system using Micro Air Vehicles (MAV) and wireless networks for enhanced safety against natural disasters. The system consists of MAVs and Unmanned Ground Vehicles (UGV). Each vehicle has a wireless network unit, which employs the dual-mode Wireless Access in Vehicular Environment (WAVE) in a 5 GHz or 700 MHz band, which can create a multi-hop (more than three hops) ad hoc network. These features enable the system to facilitate rescue and relief operations in the event of serious disasters. The proposed system represents a novel innovation in the field of mesh network systems, based on a combination of ubiquitous MAVs and UGVs.



Patents survey and analysis


Cyber Creative Institute is also doing patent survey and analysis.

Title Evaluation on patents decleared to ETSI as essential to LTE related standads
Authors ETSI Essential Patents Evaluation Project Team of Patent Division, Cyber Creative Institute.
Published This site
Date 12 December 2011
Abstract The number of patents declared to ETSI by companies as being essential to LTE standards is now becoming an index for knowing the “patent power” of those companies.
The true “patent power” of any company, however, cannot be measured simply by counting the number of its patents on the list of essential patents published by ETSI..
Therfore, this survey’s aims are to estimate the number of essential patents held by each company firstly by analyzing the list of ETSI (European Telecommunications Standards Institute) essential patents and then by removing duplications by grouping patents into families and finally by evaluating them using an equal evaluation criteria.



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