Acta Metallurgica Sinica(English letters)

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A new access scheme in OFDMA systems

GU Xue-lin; YAN Wei; TIAN Hui; ZHANG Ping   

  1. Wireless Technology Innovation (WTI) Institute, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2006-06-12 Revised:1900-01-01 Online:2006-09-30
  • Contact: GU Xue-lin

Abstract: This article presents a dynamic random access scheme for orthogonal frequency division multiple access (OFDMA) systems. The key features of the proposed scheme are: it is a combination of both the distributed and the centralized schemes, it can accommodate several delay sensitivity classes, and it can adjust the number of random access channels in a media access control (MAC) frame and the access probability according to the outcome of Mobile Terminals access attempts in previous MAC frames. For floating populated packet-based networks, the proposed scheme possibly leads to high average user satisfaction.

Key words: random access scheme;RACH;OFDMA;dynamic access probability

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