Significance of Radio Signal Parameter
Wireless networks have been closely integrated with people's lives, work, and entertainment. However,
users of WLAN wireless networks may think that wireless network should have the same stable as wired
networks.
In fact, evaluating the performance of a wireless network is very different from evaluating the performance
of a wired network. For example, if your laptop is connected to a wired network switch through a network
cable, the data connection rate between the links is 1000Mbps, then you will use the performance test tool
to test the throughput of the physical link will basically get the same result, the physical layer efficiency is
above 90%, and very stable. However, if your laptop is connected to the AP wirelessly, the data rate of the
link may show 1300Mbps, but what the result will be if you run a throughput test tool?
You may only get about 65%, and this throughput result is only based on 1 on 1 connection between AP
and client. As the number of terminals/clients increases, the aggregate throughput of all clients will continue
to decline. The reasons for this phenomenon are:
1. Objective factors such as unstable and unreliable air media;
2. The wireless network uses the CSMA/CA mechanism for access, and data collision and access
retreat are common events;
3. The MAC layer uses an acknowledgment mechanism so that data retransmission is inevitable;
4. In order to be compatible with old terminals such as 802.11a/n, the physical layer design increases
the overhead of the leader
The 802.11 protocol exchanges a large amount of system overhead for reliability of the data transmission.
In addition, the diversity of the clients will also cause a huge difference in system throughput.
Let’s say we have an 802.11ac supported AP with three spatial streams is deployed on the 80MHz channel,
and when the client also with three spatial streams (usually a laptop) connected, a 1300 Mbps connection
data rate can be negotiated. But when a client (a smartphone or tablet) with single spatial stream connects
to the AP, you can only establish a connection with data rate of 433 Mbps. Obviously, the huge difference
in peak throughput between the two will affect the performance of the entire system.
In short, to ensure the performance and user experience of the wireless network. Its planning, design, and
maintenance are very different from wired networks. So what parameters or key factors we need to focus
on in wireless deployment?
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