Detailed introduction: Broadband Wireless Access Network Based on Wireless Mesh Technology (1)

The broadband Wireless access network of Wireless Mesh Technology brings new opportunities for our Wireless networks. It breaks through the bottleneck of traditional Wireless networks and is more suitable for long-distance transmission and is suitable for complex environments. The following is a detailed introduction.

1 Overview

In recent years, broadband wireless access technology has attracted widespread attention. Compared with other broadband access technologies, broadband wireless access systems have many advantages, such as low investment, short construction periods, and fast service provision. For this reason, the IEEE committee has specially formulated the standard and proposed a broadband wireless access solution using PMP network structure. However, the PMP structure must ensure line-of-sight transmission. For densely populated cities, due to the existence of many obstacles such as tall buildings and trees, the coverage is very limited. Therefore, in the later 16A standard, a broadband wireless access solution based on wireless Mesh technology was proposed, A wireless Mesh network is a high-capacity, high-speed, multi-point-to-multi-point network. It is a new type of distributed network that can solve the bottleneck of "last mile.

Mesh networks are different from traditional wireless networks because each user node is part of a backbone network and can forward information from other user nodes. As network nodes increase, network coverage and flexibility will also increase.

2 Structure of Broadband Wireless Access Network Based on Wireless Mesh Technology

In this network structure, all BS and SS are called nodes. There are two types of nodes in the network: The Mesh BS node and the Mesh SS node. The Mesh BS node is similar to the BS in the PMP network and is connected to other backbone networks for broadband access; mesh SS nodes can enable broadband access for local users and forward data from other nodes to the target node, which is similar to a trunk station. The biggest difference between the Mesh network topology and PMP network structure is that in PMP networks, only BS and SS can communicate directly, but in Mesh networks, SS can also communicate directly, in addition, BS and SS can communicate indirectly through other SS. A node directly connected to a node is called a neighbor node of the node, and the distance between them is called a "Hop ".

In a network built using Wireless Mesh Technology, each node in the network has a routing function, and each node only communicates with neighboring nodes. Therefore, it is a self-organized and self-managed network. In fact, the Wireless Mesh network is more like a Wireless version of the Internet. The grouped data is transmitted from one route to another until it reaches its destination, these features make the Wireless Mesh Network significantly different from the traditional cellular communication network and fixed communication network.

3 advantages of Broadband Wireless Access Network Based on Wireless Mesh Technology

In the past few years, most broadband wireless access systems have adopted the PMP structure, which supports a high data rate. Multiple users share network resources, but its coverage is small, working in the micron band, the BBS base station and the user Station SS require line-of-sight transmission, which greatly reduces the number of users who can provide services and limits the capacity. When users increase, it is costly to add a new BS device to ensure line-of-sight transmission. However, when the number of users increases for a Mesh-based broadband wireless access network, each user station can serve as a transfer station, potentially increasing the network coverage. For carriers, wireless Mesh networks have the following advantages over PMP networks:

1) The network coverage increases, the spectrum utilization increases, and the system capacity increases.

2) the unique multi-Route Selection feature of the Mesh network structure improves the flexibility and availability of the network. When a path is incorrect, you can select another path.

3) The network is scalable and easy to expand. The initial construction cost is low, and the investment cost is about 15% of PMP network.

4) the investment risk is relatively small, and the cost can be recovered within a short period of time to make profits.

In short, this technology has many advantages over traditional point-to-point technologies, such as energy saving, automatic configuration, and easy resizing. Many companies have begun to use the Wireless mesh Technology for broadband network access, in addition, related wireless routers and other products have been commercially available.

4 Key Technologies of Broadband Wireless Access Network Based on Wireless Mesh Technology

The use of Wireless Mesh broadband access network can solve some problems of PMP broadband Wireless access network, but it also has its own problems. Several key technical problems need to be further studied and solved.