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Old 11-18-2007, 09:06 AM   #1 (permalink)
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Default Uma + Wds?

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We have awful signal in the administration offices so we are looking at getting a few 8320s with UMA for the higher ups so they can actually get a signal. I have 3 identical Dlink 3200ap devices which supposedly support WDS or WDS+AP.

I setup one of these boxes for an inital test to see if UMA would work at all and it worked great provided I stayed in range. I setup all 3 with the same SSID & channel with WDS+AP turned on, then fed them the MAC addresses of the other two devices. One device is hardwired the other are just plugged into AC power. The logs report that they have a connection to the other APs so at least they see each other.

So here's my problem... I can make UMA calls while in the range of the hardwired AP but if I leave the range my call drops out. I have enable inter-access point handover turned on. I turned on site-survey and walked my test path and always had at least two APs within range. Wi-Fi diagnostics also shows that the device is switching to the other APs, only the MAC changes the SSID, channel and my IP stay the same. Leaving the range of the wired AP to one of the satelite APs also causes UMA to say ISP error. I power off the phone, to try to force it to reassociate with the satelite AP, it gets a signal but again no UMA. Walking toward the wired one gets the UMA to come back online. I think the satelite APs just can't handle UMA if they are unwired.

Is there something I can try? Should I hardwire all 3 APs or will that break WDS?
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Old 11-18-2007, 01:05 PM   #2 (permalink)
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I would think that hardwire would be best to eliminate network delay caused by the WDS. If the APs are wired, there is no need for WDS.
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Old 11-18-2007, 02:39 PM   #3 (permalink)
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Originally Posted by absoluteevel View Post
I would think that hardwire would be best to eliminate network delay caused by the WDS. If the APs are wired, there is no need for WDS.
But would that allow for seamless handover? I thought that I read that the SSID must be the same throughout or handover won't work.
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Old 11-18-2007, 05:04 PM   #4 (permalink)
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Default Update: Still no UMA bliss

I wiped the configs on the dlink APs then set them up as basic APs with the same SSID and password but different channel. The site survey on my BB shows that the phone is switching between APs and the IP stays the same. Unfortunately the APs don't renegotate fast enough to pass so the call either drops audio for several seconds or drops altogether.

The Cisco equipment here freaked out when I setup WDS on the dlink devices. Apparently it thought it was seeing a loop so it turned the ports off, oh goodie!

I'm going to try again with two Linksys 54g devices running DD-WRT.
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Old 11-18-2007, 06:04 PM   #5 (permalink)
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According to the wikipedia entry I was reading... The wireless channel and SSID must be the same throughout. If you hardwire the APs to the router, you can still set their SSIDs and channels to match.

I think that WDS would just introduce latency and bandwidth from the extra wireless connection.
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Old 11-18-2007, 06:52 PM   #6 (permalink)
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So go with same SSID and channel with regular AP mode?
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Old 11-18-2007, 08:24 PM   #7 (permalink)
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Yeah.. and each wired to a port on the router, only DHCP running should be on the router.
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Old 11-19-2007, 08:39 AM   #8 (permalink)
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Will DHCP on the Windows server hold up the handover? I'll give it a try when I get into the office.

I'm wondering if anyone has gotten nearly seamless handover to work.
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Old 11-19-2007, 11:02 PM   #9 (permalink)
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I think it's mostly working now, there are a few minor hiccups but short of running Aruba networks equipment it'll do.

Here's what I did
  • Mount APs in ceiling
  • Set SSID, channel and encryption key to the same values
  • Set static IPs for phones outside the DHCP scope

I also noticed that the D-Link APs weren't the fastest for renegotiating a link. The linksys APs running DD-WRT seemed to do better but the range went down even after increasing power.
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