How to improve poor Wireless Performance?

[imwang168]

In our Environment, there a 2504 WLC with 10 LAPs( Several 2602, several 1242), there are FLEXConnect Group with local switch and Local Authentication, but there are some clients connected to WiFi with poor wireless performance, their ping value is more 100ms, specially the audio quality is ver bad when there are Lync calls, Whehter you may give some suggestions?

[grabonlee]

Hi

What is the received signal level for the clients?

If the APs connect to the WLC over the WAN, what is the average WAN latency and WAN bandwidth?

[imwang168]

I don't check the received sigal level, but i think the received sigal level is acceptable.

all LAPs connect to the WLC over the LAN, not WAN, so the latency is less than 1ms.

[grabonlee]

Are the clients connected to a particular AP or the problem across various APs. Could you confirm the reported signal level from the clients? Also what is the ping response to the AP

Sent from Cisco Technical Support Android App

[imwang168]

I only found the signal level is good for several clients, we not ping to AP, but ping to the subnet gateway is more than 100ms.

[Leo Laohoo]

The amount of APs is irrelevant. What is more important is the location and placement of the AP in relation to the location of the wireless clients. ANother thing to consider are the obstacles between the AP and wireless clients (like walls, compactors, etc.).

Do you have TPCv1 and DPC enabled by default?
What Data Rates are you having problems?
When users are complaining of low signals, what radio are they using?
What exact antenna model are you using for the APs?

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[imwang168]

some clients will connect to remote AP, the performance is bad, some clients connect to near AP, the performance is still bad, our office area is 40m * 25m, please refer to below picture for the distribution of AP and Clients. only the obstacles is wooden wall between manager room and AP, usually the AP will be very close to the room.

Yes, we have the default TPC and DPC.

sometime I found the down rate is not good, because we often run audio data(Lync).

I checked the radio is 2.4G for some clients, 5G for some clients

it is 1728 for 1242, 2602 is default.

[Leo Laohoo]

it is 1728 for 1242,

That's a high-gain 2.4Ghz antenna.  How about 5.0 Ghz?

Test this way:  Disable 2.4 Ghz and test the signal strength yourself.  Use multiple types of wireless clients (laptop, or smartphones or tablets) but DO NOT USE one wireless client.

Once you are done, disable 5.0 Ghz (and enable 2.4 Ghz) and test again.

Give us the feedback.

Make sure all your wireless clients' NIC are updated.

[imwang168]

Thanks for your reply! I will also try to test it.

I want to know whether there are also some optimization solution on WLC for Wireless stable? because our concerns is Lync audio, most of users have the audio issue under wireless, if wired user, the audio is good.

[Leo Laohoo]

most of users have the audio issue under wireless, if wired user, the audio is good.

Again, this will depend entirely on the foundation of your wireless network.  If you have high inteferrence or the signal is low (and other factors), then it will substantially impact your voice because voice traffic is transmitted in real-time.

So far information you've provided (except for the floor plan, which is helpful) doesn't shed any light.  More troubleshooting required.

[Leo Laohoo]

Another thing:  What is the distance between AP 1 and AP3, AP 2 and AP 4?

[imwang168]

sometime the signal is good, but clients also have poor network. the call audio quality is not good.

the distance is about 17m between AP1 and AP2 as well as AP3 and AP4, 24m between AP1 and AP3 as well s AP2 and AP4

[Leo Laohoo]

sometime the signal is good, but clients also have poor network.

The AP does NOT decide which clients can join.  It is the invidual wireless client that decides which AP to join.  You can have a client directly underneath an AP but the wireless client can join the furthest AP.

Do the tests and let us know.

Can you also post the output to the WLC command "sh wlan "?

[imwang168]

Yes, a clients underneath an AP will join the further AP.

Below is the output

---------------------------------------------------

(Cisco Controller) >show wlan 2

WLAN Identifier.................................. 2
Profile Name..................................... CoCoWW
Network Name (SSID).............................. CoCoWW
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Disabled
Network Admission Control
  Client Profiling Status ....................... Disabled
   DHCP ......................................... Disabled
   HTTP ......................................... Disabled
  Radius-NAC State............................... Disabled
  SNMP-NAC State................................. Disabled
  Quarantine VLAN................................ 0
Maximum number of Associated Clients............. 0
Maximum number of Clients per AP Radio........... 200
Number of Active Clients......................... 62
Exclusionlist.................................... Disabled
Session Timeout.................................. Infinity
CHD per WLAN..................................... Enabled

--More-- or (q)uit
Webauth DHCP exclusion........................... Disabled
Interface........................................ management
Multicast Interface.............................. Not Configured
WLAN IPv4 ACL.................................... unconfigured
WLAN IPv6 ACL.................................... unconfigured
DHCP Server...................................... Default
DHCP Address Assignment Required................. Disabled
Static IP client tunneling....................... Disabled
Quality of Service............................... Platinum
Per-SSID Rate Limits............................. Upstream      Downstream
Average Data Rate................................   0             0
Average Realtime Data Rate.......................   0             0
Burst Data Rate..................................   0             0
Burst Realtime Data Rate.........................   0             0
Per-Client Rate Limits........................... Upstream      Downstream
Average Data Rate................................   0             0
Average Realtime Data Rate.......................   0             0
Burst Data Rate..................................   0             0
Burst Realtime Data Rate.........................   0             0
Scan Defer Priority.............................. 4,5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
WMM UAPSD Compliant Client Support............... Disabled

--More-- or (q)uit
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
Passive Client Feature........................... Disabled
Peer-to-Peer Blocking Action..................... Disabled
Radio Policy..................................... All
DTIM period for 802.11a radio.................... 1
DTIM period for 802.11b radio.................... 1
Radius Servers
   Authentication................................ Global Servers
   Accounting.................................... Global Servers
      Interim Update............................. Disabled
   Dynamic Interface............................. Disabled
Local EAP Authentication......................... Disabled
Security

   802.11 Authentication:........................ Open System
   FT Support.................................... Disabled
   Static WEP Keys............................... Disabled
   802.1X........................................ Disabled

--More-- or (q)uit
   Wi-Fi Protected Access (WPA/WPA2)............. Enabled
      WPA (SSN IE)............................... Enabled
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Enabled
      WPA2 (RSN IE).............................. Enabled
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Enabled
                                                               Auth Key Manageme

nt
         802.1x.................................. Enabled
         PSK..................................... Disabled
         CCKM.................................... Disabled
         FT-1X(802.11r).......................... Disabled
         FT-PSK(802.11r)......................... Disabled
      FT Reassociation Timeout................... 20
      FT Over-The-DS mode........................ Enabled
      GTK Randomization.......................... Disabled
      SKC Cache Support.......................... Disabled
      CCKM TSF Tolerance......................... 1000
   Wi-Fi Direct policy configured................ Disabled
   EAP-Passthrough............................... Disabled
   CKIP ......................................... Disabled
   Web Based Authentication...................... Disabled
   Web-Passthrough............................... Disabled

--More-- or (q)uit
   Conditional Web Redirect...................... Disabled
   Splash-Page Web Redirect...................... Disabled
   Auto Anchor................................... Disabled
   FlexConnect Local Switching................... Enabled
   flexconnect Central Dhcp Flag................. Disabled
   flexconnect nat-pat Flag...................... Disabled
   flexconnect Dns Override Flag................. Disabled
   FlexConnect Vlan based Central Switching ..... Disabled
   FlexConnect Local Authentication.............. Enabled
   FlexConnect Learn IP Address.................. Disabled
   Client MFP.................................... Optional
   Tkip MIC Countermeasure Hold-down Timer....... 60
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
SIP CAC Fail Send-486-Busy Policy................ Enabled
SIP CAC Fail Send Dis-Association Policy......... Disabled
KTS based CAC Policy............................. Disabled
Band Select...................................... Enabled
Load Balancing................................... Enabled
Multicast Buffer................................. Disabled

Mobility Anchor List
WLAN ID     IP Address            Status

--More-- or (q)uit
-------     ---------------       ------

802.11u........................................ Disabled

MSAP Services.................................. Disabled

----------------------------------------------------------------------------------------------------

[Leo Laohoo]

Load Balancing................................... Enabled

Disable Client Load Balancing.