TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
7
2. WLAN Overview
required parameter settings of the devices supporting the WiFi system should also be
documented.
The following table lists some of the topics that should be included in an assessm
ent
document:
Topic Comments
Are voice settings correctly set in the
infrastructure, both LAN an
d WLAN
devices?
Voice packet must have precedence over
other types of traffic.
The assessment must check for the ability to
create an QoS sol
u
tion across the entire
network.
Voice settings must be set a
c
cording to
vendor's recommendation and Ascom inter-
working reports.
Note: These reports provi
d
e important
information for ensuring interoperability
between Ascom handsets and vendor
equipment. The reports are published as
Application Partner Program, Ascom Inter-
Operability Reports on the Ascom Partner
web site.
Is the right software version installed on
th
e
devices?
Devices may need newer software or hotfixes
to be able to support new devices.
This is important when new features are
added to
current protocols. For example,
when 802.11n is added to a WLAN.
Is there sufficient RF coverage? Cell boundaries, cell overlap, and channel
planning are extrem
ely important for mobile
devices which need to roam during usage.
RF coverage must be checked using Site
Sur
v
ey tools.
2.2 WLAN Planning and Provisioning
To summarize, both a legacy WLAN that is to be upgraded to support VoWiFi and an entirely
new WLAN purpose build to support VoWiFi and probably other kinds of media require:
• Comprehensive site surveys and detailed maps and floor plans of the areas where the
WLAN is to provide cove
rage.
• Adequate provisioning of hardware, in other words, the depl
oyment of sufficient APs in
suitable locations to meet the coverage requirements of the WLAN
• Extensive and accurate documentat
ion of the AP deployment using site maps and floor
plans to illustrate the deployment
• A proper, well documented commissioning se
quence including comprehensive testing
• A rigorous acceptance procedure before the comm
issioning is signed off as meeting the
voice, and other, requirements, of the new or upgraded WLAN.
In addition, a legacy WLAN:
• Should have been documented properly to provide the basis and underst
a
nding
implications of adding voice.
• May require a complete reassessment of its existing infrastructure before voice
is added.
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