Abstract
The sharply growing demand for increased transmission capacity and bandwidth in last meter and last mile access networks together with the commercialization of fifth generation (5G) wireless systems has been opening up new opportunities for non-radio frequency (RF)-based wireless technologies. Visible light communications (VLC) technology is a potential candidate for access networking in 5G, which offers a higher spectral efficiency than RF-based Femtocell networks by three orders of magnitude. This paper proposes an all wireless optical bidirectional VLC multiple access scheme for pure VLC network access points in terminals. Centralized coordination is adopted to reduce the system complexity. And reservation of resource is introduced to guarantee collision avoidance during data frame transmission. The proposed multiple access scheme introduces special system parameters to achieve the balance of system throughput and access latency. The feasibility of the proposed scheme is verified by both theoretical analysis and experimental investigation. We show that the proposed scheme is suitable for a bidirectional pure VLC access network and can be used as a supplement in the IEEE 802.11 bb for 5G+bidirectional VLC application scenarios.
Highlights
With the gradual introduction of fifth generation (5G) wireless networks, the global mobile data traffic will continue to grow at a compound annual growth rate of 46 percent in 2022, reaching 77.5 exabytes per month [1], and poses challenging requirements for 5G networks [2], with new services, such as the Internet of things (IoT), big data and artificial intelligence (AI)
The average access delay (AAD) increases with N1 > 3; i.e., the AAD determined mainly by the access procedure (N1T1) in a fixed capacity system
The proposed scheme, through the centralized authorization by the AP, is adaptively simplified by the cost of one more handshake between the AP and terminals during the access procedure to reduce the complexity of the data transmit procedure, i.e., no handshake, no carrier sensing and no random back-off before data transmission and no collision during data transmission
Summary
With the gradual introduction of fifth generation (5G) wireless networks, the global mobile data traffic will continue to grow at a compound annual growth rate of 46 percent in 2022, reaching 77.5 exabytes per month [1], and poses challenging requirements for 5G networks [2], with new services, such as the Internet of things (IoT), big data and artificial intelligence (AI). Visible band to offer higher data rates Rb, lower latency, low energy consumption and reduced implementation costs, is seen as a potential and complementary wireless technology in 5G and beyond networks [3], [4]. The license free VLC networking concept has attracted widespread attention. One of the most interesting investigations is the multiple access scheme that can push a VLC-based network to commercial use.
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