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New Member

How to improve poor Wireless Performance?

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?

30 REPLIES
Bronze

How to improve poor Wireless Performance?

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?

New Member

How to improve poor Wireless Performance?

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.

Bronze

Re:How to improve poor Wireless Performance?

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

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New Member

How to improve poor Wireless Performance?

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.

Hall of Fame Super Gold

Re: How to improve poor Wireless Performance?

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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New Member

How to improve poor Wireless Performance?

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.

Hall of Fame Super Gold

How to improve poor Wireless Performance?

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.

New Member

How to improve poor Wireless Performance?

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.

Hall of Fame Super Gold

Re: How to improve poor Wireless Performance?

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.

Hall of Fame Super Gold

Re: How to improve poor Wireless Performance?

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

New Member

Re: How to improve poor Wireless Performance?

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

Hall of Fame Super Gold

How to improve poor Wireless Performance?

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 "?

New Member

Re: How to improve poor Wireless Performance?

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

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

Hall of Fame Super Gold

How to improve poor Wireless Performance?

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

Disable Client Load Balancing.

Hall of Fame Super Gold

Re: How to improve poor Wireless Performance?

Wi-Fi Protected Access (WPA/WPA2)............. Enabled

WPA (SSN IE)............................... Enabled

WPA2 (RSN IE).............................. Enabled

Choose either WPA or WPA2.  Do not enable both.

New Member

Re: How to improve poor Wireless Performance?

What are the benefit if we disable them?

Hall of Fame Super Gold

Re: How to improve poor Wireless Performance?

Some OS do not like to choose.

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New Member

Re: How to improve poor Wireless Performance?

Just I found I can't test the band 5G, because a lot of laptops not support it! and our 1242AP are without 5G antenna.

New Member

Re: How to improve poor Wireless Performance?

For QoS Platinum, how to configure it?

WLAN -> QoS -> Profiles -> Platinum -> WAN QoS Paramenters:

Which one Maximun Priority will select from (Voice, Video, Background, Besteffort)?

Which one Unicast default Priority will select (Voice, Video, Background, Besteffort)?

Which one Multicase default Priority will select (Voice, Video, Background, Besteffort)?

Hall of Fame Super Gold

How to improve poor Wireless Performance?

Playing with QoS will probably not fix anything.  You've got issues with your wireless propagation.

There's a chance the APs are too far away from your clients or you have co-channel interferrence happening.

New Member

Re: How to improve poor Wireless Performance?

Yes, now I still have the issue with wireless propagation.

I think they both exist (too far and interferrence), Now I do not know how to optimize our wireless network! a lot of audio run on the wireless, users will get bad audio.

Just I checked our WLC, there are below parameters seems to optimize the wireless signal, if the paremeter may optimize the wireless, whether you may have the best practices?

Parameters:

1. RRM

2. DCA (Dynamic Channel Assignment)

3. TPC (have coverage and interferrence optimization)

4. Coverage

5. Client Roam

6. EDCA (Enhanced Distributed Channel Access)

7. Data Rate

Hall of Fame Super Gold

Re: How to improve poor Wireless Performance?

Organize to get a wireless site survey done.

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Bronze

Re:How to improve poor Wireless Performance?

Bacike,

As with any real time applications, voice doesn't bode well with poor wireless signal, especially more than -67dBm. As Leo suggested get a wireless survey done. Once you'be sorted the RF environment, you can deal with packet prioritization using Policy based APS on your laptops through Group Policy.


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New Member

Re: How to improve poor Wireless Performance?

How to do the wireless site survey? my 1242 APs is without 5.0GHz antenna.

in last reply, you said "esppecially more than 67", whether your meaning is that real time applications will require the signal stength more than -67dBm?

Hall of Fame Super Gold

How to improve poor Wireless Performance?

my 1242 APs is without 5.0GHz antenna.

This means that you are not transmitting 5.0 Ghz.  This means that your office is using exclusively 2.4 Ghz.  There's a big possibility that you have co-channel interferrence from OTHER WIRELESS sources.

Organize to get SOMEONE to do wireless site survey.  Wireless site survey will determine if you need more APs and whether or not 2.4 Ghz is adequate for your network.  Wireless site survey will also identify other SSID in the vicinity operating in the same channel as you are.

New Member

Re: How to improve poor Wireless Performance?

Now our wireless network link speed is high and stable, but the audio quality still have the jitter, and it is 99m for average value of ping to gateway. and the band is only set to 2.4GHz.

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

    Packets: Sent = 820, Received = 819, Lost = 1 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 1ms, Maximum = 1509ms, Average = 99ms

Control-C     Packets: Sent = 820, Received = 819, Lost = 1 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 1509ms, Average = 99ms
Control-C

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

Bronze

Re:How to improve poor Wireless Performance?

Lync can work with signal strength up to -70, but that should be your maximum. What gateway are you getting high ping values, that for wireless devices? What is jitter rate reported by your Lync Monitoring Server report for a call from a wireless client?


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New Member

Re: How to improve poor Wireless Performance?

the gateway is 192.168.1.1 for my wireless network. my wireless devices is laptop. below is Lync monitor report for my call.

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

Audio Stream (Caller -> Callee)

Codec:

x-msrta

Sample rate:

16000

Audio FEC:

True

Bandwidth estimates:

5402 Kbps

Packet utilization:

2027

Avg. packet loss rate:

1.52 %

Max. packet loss rate:

10.00 %

Avg. jitter:

20 ms

Max. jitter:

44 ms

Avg. round trip:

183 ms

Max. round trip:

414 ms

Burst duration:

300 ms

Burst gap duration:

9055 ms

Burst density:

33.33 %

Burst gap density:

0.21 %

Avg. concealed samples ratio:

6.00 %

Avg. stretched samples ratio:

2.00 %

Avg. compressed samples ratio:

10.00 %

Avg. network MOS:

3.14

Min. network MOS:

2.82

Avg. network MOS degradation:

1.11

Max. network MOS degradation:

1.43

NMOS degradation (jitter):

84.00 %

NMOS degradation (packet loss):

15.00 %

Avg. sending MOS:

3.21

Min. sending MOS:

2.61

Avg. listening MOS:

2.76

Min. listening MOS:

1.55

Audio Stream (Callee -> Caller)

Codec:

x-msrta

Sample rate:

16000

Audio FEC:

False

Bandwidth estimates:

9221 Kbps

Packet utilization:

1470

Avg. packet loss rate:

0.42 %

Max. packet loss rate:

2.16 %

Avg. jitter:

25 ms

Max. jitter:

54 ms

Avg. round trip:

161 ms

Max. round trip:

524 ms

Burst duration:

60 ms

Burst gap duration:

9180 ms

Burst density:

100.00 %

Burst gap density:

0.00 %

Avg. concealed samples ratio:

13.00 %

Avg. stretched samples ratio:

2.00 %

Avg. compressed samples ratio:

9.00 %

Avg. network MOS:

2.86

Min. network MOS:

2.64

Avg. network MOS degradation:

1.39

Max. network MOS degradation:

1.61

NMOS degradation (jitter):

95.00 %

NMOS degradation (packet loss):

4.00 %

Avg. sending MOS:

3.95

Min. sending MOS:

3.54

Avg. listening MOS:

3.04

Min. listening MOS:

2.32

Bronze

Re:How to improve poor Wireless Performance?

You definitely have a very bad network. If you hover your cursor over the items in Red, you will get a suggested cause of such high figures.

Why can't you get 5GHz antennas for your AP and then attempt the Lync call again as your laptop will definitely connect using 5ghz. In the meantime, could you ping your AP IP address with 1300 bytes and check the average and max response.

Ping x.x.x.x -l 1300 -n 500.


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