Point-to-Multipoint Wireless

The Point-to-Multipoint topology (also called star topology or simply P2MP) is a common network architecture for outdoor wireless networks to connect multiple locations to one single central location. In a point-to-multipoint wireless Ethernet network, all remote locations do not communicate directly with each other but have a single connection towards the center of the star network where one or more base station is typically located.

The remote locations at the edge of the networks are typically called “client” locations and the central location is called the “access point” or “base station”. Point-to-multipoint wireless networks have been studied in the 1990s and in the early 2000s and discussed in many academic publications because they can be affected by certain issues such as the hidden terminal issues or the exposed terminal issues, depending on the point-to-multipoint protocol implemented to coordinate the transmissions over the wireless medium. Most outdoor point-to-multipoint networks implement a centralised medium access control protocol or employ a TDMA-based protocol synchronising all radio devices with a GPS device in order to avoid the hidden terminal and exposed terminal issues.

Point-to-Multipoint Wireless

Point-to-Multipoint Wireless Network

Outdoor point-to-multipoint wireless solutions are very common both for wireless Internet service providers (WISPs) and for outdoor video-surveillance systems. In a WISP network, subscribers are connected at the edge of the network using a client device typically mounted on the roof of their house. One or more central base stations are mounted on a high building, or on a mountaintop or on a water tower in line of sight with as many client devices as possible.

In outdoor wireless video-surveillance systems, each camera in the field is connected to a wireless client device and then a base station is mounted on top of a tall building and acts as the central device and coordinator of the point-to-multipoint wireless network. In a point-to- multipoint wireless CCTV system, all video streams from the remote cameras are collected at this central location at the center of the point-to-multipoint wireless system and then transmitted to a control room using a point-to-point wireless or fiber backhaul.

Point-to-multipoint wireless links are deployed between locations where the client wireless devices  are in clear line of sight (LOS) with the device acting as the base station. In a point-to-multipoint wireless network that works using the license free 5 GHz band (for example in the 5.8 GHz or 5.4 GHz license-free bands) or using the 4.9 GHz public safety band we suggest to deploy the link in clear ling of sight (LOS) because, above  2.4 GHz, line of sight (LOS) operations provide more reliable performances. Point to multipoint networks working on  frequencies around 900 MHz or in the UHF band (400 MHz) can operate reliably in near line of sight (NLOS) or in non line of sight conditions (NLOS point to point wireless links).

Fluidmesh Networks provides advanced outdoor point-to-multipoint wireless solutions for long range and high throughput applications:

–       The Fluidmesh 3200 Base is the core of the point-to-multipoint Ethernet system. The radio has a 120 degree sector point-to-multipoint antenna and can act as the central base station and access point in point-to-multipoint wireless networks.  The Fluidmesh 3200 Base is certified to work in the 5 GHz band (including in the 5.4 GHz and 5.8 GHz frequency band) and in the 4.9 GHz public safety band.

–       The Fluidmesh 1200 VOLO can be deployed at the edge of the point-to-multipoint wireless Ethernet network and used to connect remote IP cameras or other Ethernet devices such as sensors, VOIP phone or entire IP/Ethernet networks. The Fluidmesh 1200 Volo is certified to work in the  5 GHz band (including in the 5.4 GHz and 5.8 GHz frequency band) and in the 4.9 GHz public safety band.

Please contact us if you’d like more information on our point-to-multipoint wireless Ethernet solutions.