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?

[Leo Laohoo]

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

Choose either WPA or WPA2.  Do not enable both.

[imwang168]

What are the benefit if we disable them?

[Leo Laohoo]

Some OS do not like to choose.

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[imwang168]

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.

[imwang168]

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)?

[Leo Laohoo]

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.

[imwang168]

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

[Leo Laohoo]

Organize to get a wireless site survey done.

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[grabonlee]

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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[imwang168]

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?

[Leo Laohoo]

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.

[imwang168]

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

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

[grabonlee]

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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[imwang168]

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

[grabonlee]

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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