Investigations on Physical Random Access Channel Structure in Evolved UTRA Uplink
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概要
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This paper presents the optimum physical random access channel (PRACH) structure in terms of the number of control signaling bits accommodated and the transmission bandwidth based on the link budget in order to satisfy the coverage requirement for the single-carrier (SC)-FDMA based E-UTRA uplink. First, we present the design concept of the PRACH structure considering the purposes of the random access procedure in the E-UTRA. Simulation evaluations including a system-level simulation show that a PRACH comprising a 0.5-msec preamble sequence can convey a 6-bit control signal at the cell edge when the inter-site distance (ISD) is 500m under full channel load conditions with one-cell frequency reuse. It is also shown, however, that a PRACH longer than one-sub-frame, e.g., 1.0msec, is necessary to support the ISD of 1732m assuming the same conditions. We also show that the best transmission bandwidth for the PRACH is approximately 1.08-4.5MHz from the viewpoint of the misdetection probability, and a 1.08-MHz transmission bandwidth is suitable considering other aspects such as flexible resource assignment in the time domain and a small number of options in the transmission bandwidth.
- 2009-05-01
著者
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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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Higuchi K
Wireless Research Laboratories Ntt Docomo Inc.
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Higuchi K
Department Of Electrical Engineering Tokyo University Of Science
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KISHIYAMA Yoshihisa
Access Network Development Department, NTT DOCOMO, INC.
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Sawahashi Mamoru
Department Of Electrical Engineering Tokyo University Of Science
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Kishiyama Yoshihisa
Radio Access Network Development Department Ntt Docomo Inc.
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Kishiyama Yoshihisa
Wireless Laboratories Ntt Do Como Inc.
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Higuchi Kenichi
Department Of Electrical Engineering Tokyo University Of Science
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Kakura Yoshikazu
Radio Access Network Development Department Ntt Docomo Inc.
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