In traditional wireless local area network (WLAN), each client accesses the network through a wireless link connected with AP (Access Point), forming a local BSS (Basic Service Set). If users want to communicate with each other, they must first access a fixed access point (AP), which is called a single-hop network.
In wireless Mesh networks, any wireless device node can act as both an AP and a router. Each node in the network can send and receive signals, and each node can communicate directly with one or more peers.
The biggest advantage of this architecture is that if the recent AP is congested due to excessive traffic, the data can be automatically rerouted to an adjacent node with less traffic for transmission. By ****ogy, packets can be routed to the next node nearest to the network until they reach their final destination. This way of accessing is multi hop access.
Compared with the traditional switched network, wireless Mesh network eliminates the routing requirements between nodes, but still has the redundancy mechanism and re-routing function provided by the distributed network.
In wireless Mesh networks, if you want to add a new device, you just need to simply plug in the power supply, it can automatically configure itself, and determine the best multi-hop transmission path. When a mobile device is added or added, the network can automatically discover topology changes and automatically adjust communication routes to obtain the most effective transmission path.
Compared with the traditional WLAN, wireless Mesh networks have several unparalleled advantages:
Easy deployment and installation
Installing the Mesh node is very simple. Take the device out of the packing box and connect it to the power supply. Because installation is greatly simplified, users can easily add new nodes to expand the coverage and network capacity of wireless networks. In wireless Mesh networks, not every Mesh node needs a cable connection, which is the biggest difference from wired AP.
Mesh's design goal is to minimize the number of wired devices and wired APs, thus greatly reducing total cost of ownership and installation time, which alone brings significant cost savings. Wireless Mesh network configuration and other network management functions are the same as traditional WLAN, user experience with WLAN can be easily applied to Mesh network.
NLOS (Non-Line of Sight) NLOS
NLOS configuration can be easily implemented by wireless Mesh technology, so it has a wide range of applications in outdoor and public places. Users with direct line-of-sight with the transmitter receive the wireless signal first, and then transmit the received signal to users with indirect line-of-sight. In this way, the signal can automatically select the best path continuously from one user to another, and eventually reach the target user without direct visual range. In this way, users with direct line-of-sight actually provide wireless broadband access for neighboring users without direct line-of-sight. Wireless Mesh network can be non-line-of-sight transmission characteristics greatly expand the application of wireless broadband and coverage.
The most common way to achieve network stability is to use multiple routers to transmit data. If a router fails, information is transmitted by alternate routers through alternate paths. The Mesh network is more robust than the single hop network because it does not depend on the performance of a single node. In a single hop network, if a node fails, the entire network will be paralyzed. In the Mesh network structure, each node has one or several paths to transmit data. If the nearest node fails or is disturbed, the packets will be automatically routed to the alternate path to continue transmission, and the operation of the entire network will not be affected.
In single hop networks, devices must share AP. If several devices want to access the network at the same time, communication congestion may occur and slow down the system. In multi-hop networks, devices can be connected to the network through different nodes at the same time, so the performance of the system will not be degraded.
The Mesh network also provides more redundant mechanism and communication load balancing function. In wireless Mesh networks, each device has multiple transmission paths available, and the network can dynamically distribute communication routes according to the communication load of each node, thus effectively avoiding the communication congestion of nodes. However, single hop network can not deal with communication interference and overload of access point dynamically.
The physical characteristics of wireless communication determine that the shorter the transmission distance, the easier to obtain high bandwidth, because as the wireless transmission distance increases, a variety of interference and other factors leading to data loss increase. Therefore, choosing multiple short hops to transmit data will be an effective way to achieve higher network bandwidth, which is the advantage of Mesh network.
In Mesh networks, a node not only transmits and receives information, but also acts as a router to forward information to nearby nodes. As more nodes connect to each other and the number of possible paths increases, the total bandwidth increases greatly.
In addition, because each short hop has short transmission distance, the power required for transmitting data is also small. Since multi-hop networks usually use lower power to transmit data to adjacent nodes, wireless signal interference between nodes is also small, channel quality and channel utilization efficiency of the network are greatly improved, and thus higher network capacity can be achieved. For example, in high-density urban network environment, Mesh network can reduce the mutual interference of adjacent users using wireless networks, greatly improving the efficiency of channel utilization.