I would like to know if WiFi can be generally referred to IEEE 802.11 standard in the context of IoT/machine-to-machine communications or the latter can be referred to as a more general family. I have found some people say that they literarily mean the same thing. Is this correct?
Wi-Fi vs IEEE 802.11 – Do They Mean the Same Thing?
ieee 802.11wireless
Related Solutions
802 is the number for the IEEE LAN/MAN Standards Committee, and 802.11 is the Wireless LAN Working Group.
The IEEE 802 committee maintains a web site, which lists the various current working groups within the committee.
Current:
- 802.1 Higher Layer LAN Protocols Working Group
- 802.3 Ethernet Working Group
- 802.11 Wireless LAN Working Group
- 802.15 Wireless Personal Area Network (WPAN) Working Group
- 802.16 Broadband Wireless Access Working Group
- 802.18 Radio Regulatory TAG
- 802.19 Wireless Coexistence Working Group
- 802.21 Media Independent Handover Services Working Group
- 802.22 Wireless Regional Area Networks
- 802.24 Vertical Applications TAG
- 802 5G/IMT-2020 Standing Committee
Hibernating:
- 802.17 Resilient Packet Ring Working Group
- 802.20 Mobile Broadband Wireless Access (MBWA) Working Group
Disbanded:
- 802.2 Logical Link Control Working Group
- 802.4 Token Bus Working Group
- 802.5 Token Ring Working Group
- 802.6 Metropolitan Area Network Working Group
- 802.7 Broadband TAG
- 802.8 Fiber Optic TAG
- 802.9 Integrated Services LAN Working Group
- 802.10 Security Working Group
- 802.12 Demand Priority Working Group
- 802.14 Cable Modem Working Group
- 802.23 Emergency Services Working Group
- QOS/FC Executive Committee Study Group
- ECSG TVWS TV Whitespace study group
- ES-ECSG Emergency Services Executive Committee Study Group
- OmniRAN EC Study Group
- Privacy Recommendation EC Study Group
A CCI signal of -80dBm is high enough to cause problems. If the APs hear each other at around -80, then a client in between the two APs would hear both APs at a higher level. That's where co-channel interference happens.
The problem is not the APs, but the clients. CCI doesn't just corrupt frames (any noise will do that). CCI interferes with the clear channel assessment (CCA) function in each client. When a client is ready to transmit, it checks to see that the channel is clear (that no one else is transmitting). If the signal strength is strong enough that a radio can decode signals as 802.11, then it will fail the CCA test and the radio will defer transmitting. A nearby transmitter on the same channel will make the client wait for a clear channel even though the AP it's associated is ready to listen, reducing throughput.
The co-channel signal strength should be 20 dB below the AP strength at edge of the cell. Since the cell boundary is usually -67 dBm, CCI should be -87 dB or less.
Best Answer
Wi-Fi is IEEE 802.11, the same way that ethernet is IEEE 802.3, token ring is IEEE 802.5, FDDI is IEEE 802.8, etc.
These are some of the IEEE LAN protocols, and the IEEE working groups associated with the protocols. See this answer for more IEEE 802 working groups.