Brief Introduction to wireless Mesh network standards

There are many types of wireless networks in the network. Here we will introduce the relevant content of the wireless Mesh network standard. First, we will make a comparison based on several wireless network types, and then we will learn more about the wireless Mesh network standards.

802.16 & WiMAX

IEEE 802.16 standard, also known as IEEE Wireless MAN air interface standard, is mainly used in the range of Wireless MAN. Currently, the published and ongoing standards include 802.16, 802.16a, 802.16c, 802.16d, 802.16e, 802.16f, and 802.16g. Among them, 802.16, 16a, and 16d belong to the air interface standard for fixed wireless access, while 802.16e belongs to the air standard for mobile broadband wireless access. 802.16d (802.16-2004) is a revision of fixed wireless access. It is a relatively mature and most practical standard version, corresponding to 10 ~ Transmission of line of sight and non-line of sight can be performed at a frequency range of 66GHz and less than 11 GHz. Theoretically, the coverage range of 802.16d can reach up to 50 km, and the radius of the Community is usually less than 10km. It can provide a rate of about 75 Mbit/s over a 20 MHz channel. Currently, the most common 802.16d product in China has a channel bandwidth of 3.5 M, which can provide a rate of about 10 M in the maximum modulation mode. 802.16e is an air interface standard for fixed and mobile broadband wireless access systems. Its frequency is less than 6 GHz and covers several kilometers. It can provide a rate of 15 Mbit/s over 5 Mbps channels. 802.16e is a standard based on 802.16d and is an enhancement and supplement to 16d. 802.16f defines the MAC layer and Physical Layer Management Information Library MIB of the 802.16 Fixed Wireless Access System) and related management processes. 802.16g defines 802.16 management processes and interfaces to enable 802.16 device interoperability and effective management of network resources, mobility and spectrum.

802.16d and 16e only define the physical layer, MAC layer, and aggregation layer in the air interface, and do not involve upper-layer networks and applications. To promote industrial development, WIMAX is currently working on network structure standards and business application requirements. In addition to the MAC layer physical layer, other standards related to 802.16 are mainly used for WIMAX. The full name of the WIMAX organization is the global interoperability certification Alliance for microwave access. Its purpose is to develop a testing specification and Certification System Based on the IEEE 802.16 standard and ETSI HIPerMAN standard, so that products of different manufacturers can have good interoperability after authentication, to actively promote and verify the compatibility and interoperability of broadband wireless access devices. In this way, the wide application of 802.16-based products can be promoted to a large extent, and a favorable environment can be provided for the manufacture of corresponding chips, greatly reducing the R & D and production costs of products.

802.11 is the creator of technical standards, and WIMAX is the promoter of technology and industrial chain. The relationship between them is similar to that between WiFi and. The work scope and organization form of the two are different, however, with close connection and cooperation, WiMAX has made an important contribution to IEEE consistency standards. With the development of 802.16 standardization, WIMAX is also gradually promoting consistency testing.

802.16 supports 10 ~ 66GHz line-of-sight propagation frequency band and non-line-of-sight propagation frequency band below 11 GHz. The application varies according to the transmission characteristics of different frequencies. For ~ Because the terminal needs to have an outdoor antenna, its application is mainly to provide Backhaul wireless transmission for small and medium-sized enterprises. For non-line-of-sight (NLOS) frequency bands below 11 GHz, as it can achieve indoor coverage, its applications will mainly focus on providing broadband data services for individual users. In addition, 802.16 can also realize the backend transmission function of enterprise Wi-Fi hotspot areas, as well as LAN interconnection, data leased line, narrowband business and base station interconnection.

Compared with other mobile communication systems, the 802.16 system has a high spectrum utilization and transmission rate, so it is suitable for providing broadband Internet access and mobile video services. Compared with other wired access methods such as xDSL, Cable, and optical fiber access, 802.16 Broadband Wireless Access has the advantages of faster deployment, higher scalability, and higher flexibility. For areas with low population density and ease of xDSL deployment, 802.16 can be used to provide the "wireless DSL" service for household and small business applications. In medium-sized enterprise buildings, 802.16 can support high-speed connection instead of optical fiber access. Due to the lack of local wired access resources, emerging operators can also choose 802.16 to provide wireless broadband access to carry out their businesses and open up the market.