Block-Wise Resource Block-Level Distributed Transmission for Shared Data Channel in OFDMA Evolved UTRA Downlink
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概要
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This paper proposes block-wise resource block (RB)-level distributed OFDMA transmission with ND-block division in order to obtain the frequency diversity effect even for low-rate traffic (here ND indicates the number of virtual RBs within one physical RB) in Evolved UTRA downlink. More specifically, we propose a constraint rule such that distributed transmission is multiplexed into a different physical RB from that of localized transmission in order to achieve the same resource assignment and independent decoding between the distributed and localized transmissions. Based on the proposed rule, a virtual RB for distributed transmission is segmented into ND blocks with the size of 1/ND of the original virtual RB. Then, the ND virtual blocks with the size of 1/ND are mapped together into each ND physical RB in a distributed manner, resulting in a large frequency diversity effect. Numerical calculations show that the block-wise RB-level distributed transmission can reduce the number of control signaling bits required for resource assignment compared to the subcarrier-level distributed transmission scheme, which provides the best performance. Moreover, a system-level simulation shows that the loss in the cell throughput employing the block-wise RB-level distributed transmission compared to that using the subcarrier-level transmission is only within 3-4% when the channel load is 0.5 and 1.0, i.e., the maximum loss is 3-4% at approximately 90% in the cumulative distribution function (CDF).
著者
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KISHIYAMA Yoshihisa
Radio Access Network Development Department, NTT DOCOMO, INC.
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MIKI Nobuhiko
Radio Access Network Development Department, NTT DOCOMO, INC.
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HIGUCHI Kenichi
Department of Electrical Engineering, Tokyo University of Science
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SAWAHASHI Mamoru
Department of Information Network Engineering, Musashi Institute of Technology
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NAGATA Satoshi
Radio Access Network Development Department, NTT DOCOMO, INC.
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OFUJI Yoshiaki
Radio Access Network Development Department, NTT DOCOMO, INC.
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