Transmit Power Control Essay

C. Transmit Power Control
The controller dynamically controls the access point transmit power based on real-time wireless LAN conditions. Typically, power can be kept low to gain extra capacity and reduce interference. The controller attempts to balance the access points' transmit power, according to how the access points are seen by their third strongest neighbour. The transmit power control (TPC) algorithm both increases and decreases an access point's power in response to changes in the RF environment. In most instances, TPC seeks to lower an access point's power to reduce interference, but in the case of a sudden change in the RF coverage-for example, if an access point fails or becomes disabled-TPC can also increase the power on surrounding access points. This feature is different from coverage hole detection, which is primarily concerned with clients. TPC provides enough RF power to achieve desired coverage levels while avoiding channel interference between access points.
D. Radio Research outputs Traffic load-The total bandwidth used for transmitting and receiving traffic. It enables wireless LAN managers to track and plan network growth ahead of client demand. Interference-The amount of traffic coming from another 802.11 sources. Noise-The amount of non-802.11 traffic that is interfering with the currently assigned channel. Coverage-The received signal strength (RSSI) and signal-to-noise ratio (SNR) for all connected clients Coverage-The received signal strength (RSSI) and signal-to-noise ratio (SNR) for all connected clients.
Figure 16. Dir 850L Ac1200 in 802.11 n(Expected PHY Rate)
E. Transmit Power Control (TPC) The controller dynamically controls access point transmits power based on real-time wireless LAN conditions. Typically, power can be kept low to gain extra capacity and reduce interference. The controller attempts to balance the access points' transmit power, according to how the access points are seen by their third strongest neighbour. The transmit power control (TPC) algorithm both increases and decreases an access point's power in response to changes in the RF environment.TPC provides enough RF power to achieve desired coverage levels while avoiding channel interference between access points.
F. Dynamic Channel Assignment
Two adjacent access points on the same channel can cause either signal contention or signal collision. In a collision, data are not received by the access point. This functionality can become a problem, for example, when the number of users using their AP's in a node by effectively reassigning channels, the controller keeps adjacent channels separated. To examines a variety of real-time RF characteristics to efficiently handle channel assignments. In Fig 7.shows the obtain SNR(signal to Noise Ratio) level is 45db,So, the Noise could be limited and the signal quality of the client and access point is in the lead. An increase in noise reduces the effective cell size and degrades user experience. By optimizing channels to avoid noise sources, the controller can optimize coverage while maintaining system capacity. If a channel is unusable due to excessive noise, that channel can be avoided. In 802.11 n dynamically rearrange channel assignments to increase system performance in the presence of the interference in the coverage area.