However, as channels 1, 5, 9 and 13 are theoretically also non-overlapping, the first contribution of this paper is visualization of the spectral overlap of different WLAN signals when using channels 1, 6 and 11 vs.
Save to Library Save. Create Alert Alert. Share This Paper. Figures and Tables from this paper. Citation Type. Now, with the demands placed on our networks, we need to design for network capacity, not just coverage. By correctly utilizing both the 2. We don't always get to use all of the 5 GHz channels, but overall it offers a lot more space. Many of us are familiar with an ethernet cable, which has multiple twisted pairs of copper wires in one cable. This allows for bi-directional or full-duplex communication.
Network devices on either end of the cable can talk at the same time, much like a two-lane highway. Wi-Fi is half-duplex , which means that on any channel, only one device can talk at a time. If two devices try to talk at the same time, they would interrupt each other.
Wi-Fi is more like a one-lane highway; traffic can only flow in one direction at a time. Since Wi-Fi is half-duplex, only one Wi-Fi device can transmit on a channel at a time.
The more Wi-Fi devices we add to a channel, the more we reduce opportunities for each device to talk. Wi-Fi uses a listen-before -you-talk technology called the clear channel assessment CCA to ensure that only one radio can transmit on the same channel at any given time. If an AP on channel 1 is transmitting, all nearby access points and clients on the same channel will defer transmissions.
The result is that throughput is adversely affected: Nearby APs and clients have to wait much longer to transmit because they have to take their turn.
The unnecessary medium contention overhead that occurs because all the APs are on the same channel is called co-channel interference CCI. In reality, the The unnecessary medium contention overhead caused by co-channel interference is a result of improper channel reuse design.
If only three channels are available for a channel reuse pattern, it is pretty much a given that there will be access points on the same channel within hearing distance of each other. One of the advantages of using the 5 GHz frequency band is that there are many more channels. In Europe, a 2. Although there is a small amount of frequency overlap between those four channels, the performance might in some cases be better if the medium contention overhead of co-channel cooperation can be reduced because there is less channel bleed over.
I am personally not a big believer of the four-channel plan, even in Europe. What you are looking for is the channel out of 1, 6, and 11 that has the fewest networks present. There is only one active network on channel 1, and its signal strength is very low.
In this example, the best channel to choose is channel 1. Why channels 1, 6 and 11? Get Reliable Wi-Fi at Home For professionals working from home, students studying from home, and teachers teaching from home, reliable home Wi-Fi is part of what we need to get through our day. Learn More. Related Articles.
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