MAC Layer DATA/ACK Handshake in the Hybrid VLC-RF System

[摘要] The hybrid VLC-RF system utilizes a uni-directional VLC link fordownlink and the legacy Wi-Fi link for uplink transmission. However,simply integrating the two links without any modi cation in the MAClayer would cause problems for the MAC layer DATA/ACK handshake.The acknowledgements for VLC packets have to be transmitted via ra-dio. Because of the Wi-Fi channel's contention based random access, thetransmission will be delayed and degrades the performance of the legacyWi-Fi, especially when the Wi-Fi channel is heavily loaded. In my the-sis, I design and analyze the Spoofed NAV Triggered Multi-client ACKs(STMA) scheme to transmit the delay-sensitive VLC ACK timely whilekeep the degradation of legacy Wi-Fi under-control. I implement the keycomponents of STMA and evaluate its performance with a combination ofover-the-air experiments and trace-driven simulations. The result showsthat in a dense WLAN scenario, STMA reduces the response delay andlegacy Wi-Fi degradation signi cantly in comparison to 802.11 contention-based approach.

[发布机构] Rice University

[效力级别] VLC-RF