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11-23-2023 12:41 AM - edited 11-23-2023 12:45 AM
Hi,
As per the MU-MIMO definition AP can serve simultaneous multiple clients in same time. If it is 4x4 AP, it can serve 4 number of simultaneous clients same time. In theory it says maximum per radio 200 simultaneous users can be connected to a AP, then all simultaneous users are 400. I have a confusion what is the difference between MIMO simultaneous users and AP simultaneous users. Could anyone please explain this ?
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11-23-2023 10:55 AM
You're confusing connected/associated users which have joined the AP with the number of users which can simultaneously transmit/receive to/from the AP. MU-MIMO addresses the latter which is about managing the radio bandwidth/throughput at any given moment. It's a fundamental basis of WiFi that the airwaves are a shared medium so you can never have every client tx/rx at the same time.
Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
------------------------------
TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390

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11-23-2023 02:28 PM
the 4x4 also refers to spacial streams some clients use more than 1 things like laptops may be 2x2 so in that case 2 clients at same time.
As stated before the difference between connected and transmitting clients
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11-23-2023 10:55 AM
You're confusing connected/associated users which have joined the AP with the number of users which can simultaneously transmit/receive to/from the AP. MU-MIMO addresses the latter which is about managing the radio bandwidth/throughput at any given moment. It's a fundamental basis of WiFi that the airwaves are a shared medium so you can never have every client tx/rx at the same time.
Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
------------------------------
TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390

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11-23-2023 02:28 PM
the 4x4 also refers to spacial streams some clients use more than 1 things like laptops may be 2x2 so in that case 2 clients at same time.
As stated before the difference between connected and transmitting clients
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11-24-2023 02:49 AM
@Rich R @Haydn Andrews Thanks for your clarifications.
That means although many number of users are connected to the AP, only the simultaneous users that are allowed in MIMO can transfer data at the same time. What about others who want to transfer data? Do they need to wait until the airwaves are free from currently using clients ?
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11-24-2023 03:48 AM
Short answer - yes.
That's what the WiFi 802.11 standards are all about and there have been various enhancements and improvements over the years which is what all the suffix letters after 802.11 are,
https://en.wikipedia.org/wiki/IEEE_802.11
Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
------------------------------
TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390
