Abstract
IEEE 802.15.7 Visible Light Communication (VLC) networks suffer from performance degradation caused by the hidden device collisions due to the directional transmission with narrow beamwidth. One of the solutions for mitigating the hidden device collisions is to employ a full-duplex transmission technique. As a side effect of the full-duplex transmission in the VLC networks, however, the data-packet discard due to the retransmission limitation occurs frequently in the networks. This paper proposes an improved backoff scheme and its performance analysis to suppress the packet discard. The proposed backoff scheme increases the Backoff Exponent (BE) and the Number of Backoff stage (NB) in IEEE 802.15.7 only when the data packet transmission fails. To evaluate the system performance theoretically, this paper also provides the Markov-chain model for channel access with the proposed scheme. The performance evaluations through simulation and theoretical analysis show the effectiveness of the proposed scheme.
Highlights
This paper proposes an improved backoff scheme to reduce the serious packet discard and its performance evaluation based on the theoretical analysis
This paper proposed an improved backoff scheme to reduce the serious packet discard in Visible Light Communication (VLC) networks
For the increased access delay, we proposed to apply the limitation for keeping the Backoff Exponent (BE) and Number of Backoff stage (NB)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The backoff scheme specified in IEEE 802.15.7 based on FD VLC networks has caused serious data-packet discards even if the packets are not involved in any collisions. This is because the device may keep increasing its values of the Backoff. This paper proposes an improved backoff scheme to reduce the serious packet discard and its performance evaluation based on the theoretical analysis. In the proposed backoff scheme, the BE and NB values in IEEE 802.15.7 are increased only when the data packet transmission fails due to packet collision.
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