Speakers Information
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Mamoru Sawahashi Director; IP Radio Network Development Department, NTT DoCoMo, Inc. Japan Presentation Title Outline of Evolved UTRA and Future Broadband Packet Access Abstract The study item of the Evolved UTRA (UMTS Terrestrial Radio Access) and UTRAN (UMTS Terrestrial Radio Access Network) assuming 3G spectrum usage was approved in the 3rd Generation Partnership Project (3GPP) last December. In the presentation, the concept and requirements of the Evolved UTRA and UTRAN (called Super 3G internally in DoCoMo) will be presented first. The Evolved UTRA and UTRAN will achieve a short delay (i.e., low latency) and affinity to IP-based core networks in order to provide rich high-rate services at low cost. We believe that the Evolved UTRA and UTRAN will form a competitive radio access network for other radio access systems even in the future 4G era and will enable smooth migration to the future 4G broadband packet radio access network. In the presentation, field experimental results will be presented on broadband packet radio access targeting future 4G radio access. In accordance with the target data rate for the systems beyond IMT-2000 in the ITU-R recommendation, the target data rates are set to greater than 100 Mbps and 1 Gbps in a cellular environment with high mobility and with a wide area coverage, and in local areas with low mobility, respectively. Moreover, both cellular systems with a multi-cell configuration and local areas such as hotspot and indoor office environments are flexibly supported using the same radio access from the standpoint of further reducing the RAN cost. To realize this concept, the Variable Spreading Factor (VSF) scheme was proposed to achieve one-cell frequency reuse in cellular environments by utilizing the spreading gain including the channel coding gain, whereas a high achievable throughput is achieved in local areas without spreading associated with a high coding rate. Based on this concept, the results of field experiments, which were conducted in cellular environments with the cell radius of approximately 1 km at the average moving speed of 30 km/h, will be presented to show the possibility of high-speed packet data service of greater than 100 Mbps in future cellular systems. Reports on field experimental results regarding key techniques such as Adaptive Modulation and Coding (AMC) and hybrid Automatic Repeat reQuest (ARQ) based on the above-mentioned wireless access scheme will also be presented. Finally, real-time 1-Gbps packet transmission using MIMO multiplexing will be shown through field experimental results. In the implemented testbed, adaptive selection of the surviving symbol replica candidate (ASESS) algorithm in the Maximum Likelihood Detection (MLD) employing QR decomposition and the M-algorithm is applied to achieve a low required received signal-to-noise power ratio. Biography Mamoru Sawahashi received his B.S. and M.S. degrees from Tokyo University in 1983 and 1985, respectively, and received his Dr. Eng. Degree from the Nara Institute of Technology in 1998. In 1985, he joined the NTT Electrical Communications Laboratories, and in 1992 he transferred to NTT Mobile Communications Network, Inc. (now NTT DoCoMo, Inc.). Since joining NTT, he has been engaged in the research of modulation/demodulation techniques for mobile radio. He has also been engaged in the research and development of radio access technologies for W-CDMA mobile communications and broadband radio packet access technologies for 3G long term evolution and for the systems beyond IMT-2000. He is currently serving as an editor for the IEEE Transactions on Wireless Communications. He is now the Director of the IP Radio Network Development Department in NTT DoCoMo, Inc.

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