Yoshihiko Shirokura

Implementation of 324Mbps WLAN equipment with MAC frame aggregation for high MAC-SAP throughput

We developed a high speed wireless LAN prototype in the 5GHz band that is backward compatible with legacy IEEE802.11a. The developed WLAN equipment has a data rate of 324Mbit/sec using 6 PHY transmission channels of 802.11a. We propose frame aggregation to improve MAC efficiency. The proposed frame aggregation features an adaptive aggregation size selection depending on wireless channel conditions and application requirements. The optimal frame aggregation size for the PHY data rate is evaluated by using computer simulation. MAC throughput as a function of aggregation size was simulated and measured. We find that high throughput of more than 170Mbit/sec was achieved using the proposed frame aggregation.

324Mbps WLAN equipment with MAC frame aggregation

We developed a high speed wireless LAN prototype in the 5 GHz band. Maximum transmission rate of the developed WLAN equipment was 324 Mbit/sec using 6 multi-channels of 802.11a. We proposed a novel frame aggregation scheme to improve MAC efficiency. The proposed frame aggregation scheme had a feature of an adaptive aggregation size selection depending on wireless channel conditions and application requirements. Throughput performance was simulated in the case of multiple stations with the proposed frame aggregation. The evaluated system throughput was achieved more than 150 Mbit/sec in the case of 10 STAs. It is found that throughput of the developed equipment was measured to be more than 170 Mbit/sec using the proposed frame aggregation

324Mbps WLAN Equipment with MAC Frame Aggregation for High MAC-SAP Throughput

We developed a high speed wireless LAN prototype in the 5GHz band. Maximum transmission rate of the developed WLAN equipment was 324Mbit/sec using 6 multi-channels of 802.11a. We proposed a novel frame aggregation scheme to improve MAC efficiency. The proposed frame aggregation scheme had a feature of an adaptive aggregation size selection depending on thewireless channel conditions and application requirements. Throughput performance was obtained from simulation using a multiple station system with the proposed frame aggregation. A throughput of more than 150Mbit/sec was achieved with an evaluated system of 10 STAs. We also found that the measured throughput of more than 170Mbit/sec was achieved using the proposed frame aggregation.

A Closed-Loop Link Adaptation Scheme for 324Mbit/sec WLAN System

We developed a high speed wireless LAN prototype in the 5 GHz band. Maximum transmission rate of the developed WLAN system is 324 Mbit/sec using 6 multi-channels of 802.11a. We propose a closed-loop link adaptation scheme to improve MAC efficiency. The proposed scheme inserts MCS (Modulation and Coding Scheme) feedback information into Data frame and ACK frame. The MCS is calculated based on the estimated SNR. We compared the proposed link adaptation scheme with the legacy ACK-based link adaptation schemes by computerized simulation. The proposed link adaptation scheme achieved higher throughput than the legacy ACK-based link adaptation scheme. We also found that the proposed link adaptation scheme selected the optimal MCS on the developed WLAN system.

Demonstration of HDTV Transmission Using 324Mbps WLAN Equipment

We developed a high speed wireless LAN prototype in the 5GHz band. Maximum transmission rate of the developed WLAN equipment was 324Mbit/sec using 6 multi-channels of 802.11a (1). We implemented a frame aggregation scheme to improve MAC efficiency (2-3). The evaluated system throughput was achieved more than 170Mbit/sec using the implemented frame aggregation. The HDTV transmission using 324Mbit/sec WLAN equipment was demonstrated. We compared the developed prototype and the conventional 802.11g (4).