A dual-frequency combination terahertz wireless local area network protocol architecture

Abstract

The invention discloses a dual-frequency combined terahertz wireless local area network protocol architecture. The architecture comprises physical layers and a data link layer. The physical layers comprise a 2.4GHz physical layer (PHY) based on a 802.11 protocol, and a terahertz PHY. The data link layer comprises two levels of media access control (MAC) sublayer. The two levels of MAC sublayer are an independent lower MAC layer and a public upper MAC layer. The independent lower MAC layer comprises a lower MAC layer based on the 802.11 protocol and a terahertz lower MAC layer. The architecture uses Wi-Fi of 2.4GHz frequency band for user access and low-speed data transmission, so that the wide coverage area characteristic of the local area network is guaranteed; when high-speed data transmission is demanded, the architecture switches to the terahertz frequency band for terahertz high-speed data transmission, so that the high speed characteristic of the terahertz local area network is ensured, and the terahertz wireless local area network has the ultrahigh speed networking communication capacity in a large coverage area.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a dual-frequency combined terahertz wireless local area network protocol framework. Background technique [0002] The simplified reference model of the network protocol architecture of Wi-Fi LAN based on 802.11a / b / g / n protocols in the 2.4GHz / 5GHz frequency bands currently widely used is as follows: figure 1 As shown, it is mainly divided into the physical layer (PHY) and the data link layer (MAC). The MAC layer is composed of the MAC protocol sublayer and the MAC management module. The PHY layer is composed of the physical medium dependency (PMD) PLCP) sublayer and PHY management module. [0003] In this network structure, the communication frequency generally adopts 2.4GHz or 5GHz, and the antennas all use near-omnidirectional antennas to ensure a large network space coverage. However, the loss of electromagnetic waves in free space is positively correlated with...

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Problems solved by technology

[0005] Since the terahertz frequency band is at least twice as high as the 60GHz frequency band, the gain of the antenna will be larger and its beam width will be narrower. If this similar scanning alignment and communication technical solution is adopted in the terahertz frequency band, The required scan alignment time will be longer, reducing the overall efficiency of the LAN

At the same time, this scan alignment strategy itself is very complex and cumbersome, and it is difficult to implement in practical applications.

In addition, the core electronic devices in the terahertz frequency band are not yet mature enough, and it is still difficult to produce phased array chips in the terahertz frequency band, so it is not realistic to use beamforming and control solutions at the current stage

Furthermore, because the wavelength of the terahertz frequency band is very short, its penetration and diffraction characteristics to substances are poor, and it is easy to be blocked by human bodies and objects in indoor LAN applications and cannot achieve effective communication. quasi-recommunication technology will fail

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