What is BDMA?(Beam Division Multiple Access)
As we know various multiple access techniques have been developed for multiple users to exploit efficient usage of common resources such as time, frequency, codes etc. This has pioneered development of FDMA, TDMA, CDMA and OFDM techniques. The main aim here is to provide quality service to the subscribers/users at affordable cost.
The most common critical resources such as time and frequency has been shared among multiple users using TDMA and FDMA respectively. The Korean R & D has devised new access technique known as BDMA for fifth generation of mobile wireless communication systems. The full form of BDMA is Beam Division Multiple Access. This technique do not utilise time and frequency resource sharing. Refer 5G to know the features supported in fifth generation of systems.
BDMA Basics in 5G
The figure depicts the BDMA technique. As shown here base station allocates separate antenna beams to each of the mobile devices. This is done after evaluating their positions as well as moving speed with respect to base station. Often this is communicated by the mobile devices(i.e. stations). This BDMA technique helps in achieving higher system capacity.
Based on position and moving speed, base station will calculate both width and direction of the beam for all the mobile stations.
All the mobile stations communicate with Base station when they are in LOS with it. In BDMA, all the beams are distinct for individual stations. Hence simulateneous data transmissions are possible to different mobile stations at different angles.
The mobile stations at the same angle can also be addressed by same single base station based on width, direction and number of beams.
To support more number of users, beam is 3-dimensionally divided.