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.
Original language | English |
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Pages (from-to) | 2810-2818 |
Number of pages | 9 |
Journal | IEICE Transactions on Communications |
Volume | E88-B |
Issue number | 7 |
DOIs | |
Publication status | Published - 2005 Jul |
Keywords
- AMC
- AMC-based subchannel multiplexing
- Multi-class service
- OFDMA system
- Packet scheduling
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering