Dynamic and reconfigurable smart optical-carrier wireless access technology (1)

1. New Network Architecture

To achieve intelligent light-borne wireless networks, designing a good network architecture is the first thing to consider. Considering the advantages of the mainstream network architecture in the world and avoiding its shortcomings, we propose the fiber-optic Radio (RoF) Network Architecture shown in 1.

The architecture consists of three layers: distributed wireless access layer, optical switching layer, and total base station pool.

In response to the application requirements for a wide range of low-cost Wi-Fi coverage and the access needs for high-definition data services such as gibits HD video in smart homes, we have embodied the above general smart light-loaded wireless network architecture, two network architectures with specific applicability are proposed.

1.1 Distributed Optical carrier Wi-Fi network architecture design and link implementation for broadband access and ubiquitous Sensing Applications

The typical Iot architecture consists of three layers: perception layer, transport layer, and application layer [2]. This paper proposes a transport layer network based on the optical carrier Wi-Fi heterogeneous structure, as shown in figure 2.

As shown in figure 3, we use the rough Wavelength Division Multiplexing (CWDM) method to simulate direct ROF network architecture. After simulating direct debugging, optical Signals of different wavelengths are transmitted in one optical fiber after being reused by a CWDM device. The optical fiber is deduplicated at the other end, and the optical signals are distributed to various remote antenna units (RAU, the RF signal is restored by the photoelectric detector, and the antenna emits the RF signal to achieve wireless coverage. Two-way links can meet the application requirements of broadband wireless access. The transparent structure is easy to upgrade. In the case of a small amount of hardware transformation, it can meet the transmission of 3G and other wireless standard signals [3].

1.2 multi-band dynamic and controllable ROF Network Architecture Design and link implementation for Integrated Access of multiple businesses in the building

Figure 4 shows the ROF network architecture for multi-service integration in the 2.4 GHz and 60 GHz frequencies. At the optical network unit (ONU) of the Ethernet Passive Optical Network, an additional smart resident Gateway (IGR) is used to increase the frequency of baseband signals to 2.4 GHz and 60 GHz, control and scheduling of RF resources, and use indoor optical fiber network transmission. In order to solve the cost and technical difficulties in the uplink process, we also consider that the uplink service, such as VOD, generally does not require a particularly high-speed transmission rate. The terminal design and gateway processing functions are used here, uses existing Wi-Fi signal coverage in adjacent rooms to meet the uplink needs of the local business.

In this way, through the establishment of the Wi-Fi distributed antenna system and the establishment of the 60 GHz Gigabit wireless communication link, users in each room in the building can be provided with gibit non-compressed High Definition TVs and their on-demand video services, broadband access, health monitoring, video monitoring, environmental monitoring, and other Iot services of Wi-Fi signals can be used to build a smart ubiquitous home network.

Figure 5 shows the transmission link of the dynamic and controllable ROF network that integrates multiple services in the building. Within the ONU and smart station Gateway (IRG), The gebits HDTV service source in the Internet is provided to the users in the building through EPON in wired mode. To support wireless access, using the transform interface, Ethernet parallel data is modulated to the continuous optical carrier produced by the direct-tuning laser in a serial way without returning the zero code, and then MZM is used) generates Millimeter Waves and transmits them out through Millimeter Wave antennas.

The receiver uses the receiving antenna to receive the millimeter wave signal and enlarge the power. The self-mixing method is used to lower the frequency conversion. Finally, the baseband signal can be obtained through low-pass filter filtering.

In order to realize resource configuration, we propose the radio frequency switching technology based on the MEMS optical switch matrix to achieve dynamic and controllable ROF network construction. Figure 5 uses commands from the central control unit internally to control the MEMS Optical Switch routing. In this way, the 60 GHz band, 2.4 GHz band network, and optical switch matrix can be used to achieve smart wireless coverage of multi-band and multi-service services in the building, this greatly increases spectrum efficiency and effectively reduces overall energy consumption.