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VLSI Design of Interface between MAC and PHY Layers for Adaptive Burst Profiling in BWA System  

Song Moon Kyou (Department of Electrical, Electronic and Information Engineering, Wonkwang University)
Kong Min Han (Department of Control and Instrumentation Engineering, Wonkwang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.1, 2005 , pp. 39-47 More about this Journal
Abstract
The range of hardware implementation increases in communication systems as high-speed processing is required for high data rate. In the broadband wireless access (BWA) system based on IEEE standard 802.16 the functions of higher part in the MAC layer to Provide data needed for generating MAC PDU are implemented in software, and the tasks from formatting MAC PDUs by using those data to transmitting the messages in a modem are implemented in hardware. In this paper, the interface hardware for efficient message exchange between MAC and PHY layers in the BWA system is designed. The hardware performs the following functions including those of the transmission convergence(TC) sublayer; (1) formatting TC PDU(Protocol data unit) from/to MAC PDU, (2) Reed-solomon(RS) encoding/decoding, and (3) resolving DL MAP and UL MAP, so that it controls transmission slot and uplink and downlink traffic according to the modulation scheme of burst profile. Also, it provides various control signal for PHY modem. In addition, the truncated binary exponential backoff (TBEB) algorithm is implemented in a subscriber station to avoid collision on contention-based transmission of messages. The VLSI architecture performing all these functions is implemented and verified in VHDL.
Keywords
broadband wireless access; IEEE 802.16; transmission convergence sublayer;
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