WiFi is a technology that allows wireless connections to the Internet from anywhere, such as from a couch at home, a bed in a hotel room, a conference room at work, or a city street. When deployed to provide city-wide coverage, it is generally known as Muni Wi-Fi, or a Municipal Wireless Mesh Network.

   Large corporations, campuses and cities use Wi-Fi to extend standard wired Ethernet networks to public areas, service providers and wireless ISPs use it to distribute Internet connectivity within individual homes and businesses,Wi-Fi networks are also found in coffee shops, hotels, airport lounges and other locations where large crowds gather. 


  MESH NETWORKS

   Mesh networks offer varying levels of capacity and ability to address the full range of voice, video and data applications in a Muni WiFi network.
   There are single radio wireless mesh nodes, dual-radio nodes and multi-radio nodes. Well-designed wide-area wireless mesh networks will incorporate a mixed approach to address the capacity and application demands of the network:

• Single radio wireless mesh nodes offer low cost coverage but are limited in scalability
• Dual-radio wireless mesh nodes enhance the scalability and capacity of the wireless mesh network
• Multi-radio wireless mesh nodes are used to address demanding voice and video applications, address high density coverage areas, and aggregate traffic from single- and dual-radio wireless mesh nodes. 
 


 

SINGLE RADIO MESH

   In a single radio mesh, each wireless mesh node acts as an access point that supports local clients and also forwards traffic wirelessly to other nodes in the Muni WiFi mesh network. The same radio is used for access and wireless backhaul.
   Almost every packet generated by local clients must be repeated on the same channel in order to send it to at least one neighboring node in the Muni WiFi mesh.This packet forwarding generates a lot of traffic.Very little of the channel capacity is actually available to support users.
   To address increasing user and capacity demands on the Muni Wi-Fi network or to support high-demand applications such as voice and video, single radio mesh nodes should be used in conjunction with dual- and multi-radio mesh nodes. 
 


 

DUAL RADIO MESH

   In a dual-radio mesh, the nodes have two radios operating on different frequencies. One radio is used for client access and the other radio provides wireless backhaul. The radios operate in different frequency bands so they can run in parallel with no interference and local wireless access capacity is not affected by traffic forwarding.

   In a dual-radio design, the wireless backhaul mesh is a shared network. With only one radio dedicated to backhaul at each node, all of the mesh nodes must use the same channel fairly in order to get backhaul connectivity and participate in the mesh.

   The nodes must contend for the channel and they generate interference for each other. The result is reduced system capacity as the Muni Wi-Fi network grows. The solution is to incorporate multi-radio nodes to handle the increased traffic requirements of the wireless mesh. 


MULTI-RADIO MESH

   The multi-radio wireless mesh also separates access and backhaul, but it goes a step further in order to provide increased capacity, reliability and scalability for the Muni Wi-Fi mesh network.

   Additional radios in each mesh node are dedicated to the wireless backhaul. The backhaul mesh is no longer a shared network. It is built from multiple point-to-point wireless links and each of the backhaul links operates on different independent channels.

   The mesh delivers more capacity and scales up as the size of the Muni WiFi network is increased - as more nodes are added to the system, overall system capacity increases. 


  MUNI WIFI NETWORKS

   In a BelAir Networks muni Wi-Fi mesh network, each multi-radio node supports backhaul coverage in all directions using antennas in a circular array. The antennas have a high gain and a narrow horizontal beamwidth, which together with enhanced radio performance, provide significant reach extension.
   The three backhaul radios in each platform can automatically connect to any one of the eight backhaul antennas with no need for manual pointing. The selection is done under software control via BelAir Networks patent pending autoantenna selection algorithm.
System availability is ensured through a combination of techniques:

• The radio environment is constantly changing and the radios adapt to these changes on a packet-by-packet basis. In addition, dynamic power and data rate changes on individual radio links compensate for radio effects such as fading and shadowing.
• Radio-aware routing algorithms choose the best route for traffic based on available capacity, latency and radio link performance.
• To increase system up-time and minimize traffic outages, traffic from each broadband platform can be load balanced across a minimum of two routes to reduce the impact of link congestion and failure.
• Alternate paths are continuously calculated and refreshed so that seamless re-routing of traffic can occur with minimal packet loss in the unlikely event of a link failure.

 


 

Indoor Coverage from Outdoors BelAir100_100C/S/T
Networks Cellular LAN Architecture BelAir 200
BelAir 300
  BelView NMS