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Subchannel Multiplexing Scheme for Mobile Broadband Wireless Access Services in AMC-based OFDMA System
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- Authors
- Dong Hoi Kim, Chung Gu Kang
- Issue Date
- 2005-07
- Citation
- IEICE Transactions on Communications, v.E88-B, no.7, pp.2810-2818
- ISSN
- 0916-8516
- Publisher
- 일본, 전자정보통신학회 (IEICE)
- Language
- English
- Type
- Journal Article
- Abstract
- In the adaptive modulation and coding (AMC)-based orthogonal frequency division multiple access (OFDMA) system for broad-band wireless service, a large number of users with short packets cause a serious capacity mismatch problem, which incurs resource under-utilization when the data rate of subchannel increases with a better channel condition. To handle the capacity mismatch problem, we propose an AMC-based subchannel multiplexing (ASM) scheme, which allows for sharing the same subchannel among the different simultaneous flows of the same user. Along with the ASM scheme, we also consider multi-class scheduling scheme, which employs the different packet scheduling algorithm for the different service class, e.g., packet loss rate-based (PLR) scheduling algorithm for real-time (RT) service and modified minimum bit rate-based (MMBR) scheduling algorithm for non-real-time (NRT) service. In the typical integrated service scenario with voice, video, and data traffic, we have shown that the proposed schemes significantly improve the overall system capacity. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.