Virtual Network configuration
A31003-W1040-U101-1-7619, July 2006 DRAFT
182 HiPath Wireless Controller, Access Points and Convergence Software V4.0, C10/C100/C1000 User Guide
hwc_vnsconfiguration.fm
Configuring Quality of Service (QoS)
● WMM Priority WMM (WiFi Multimedia – Enables WMM (WiFi Multimedia), which is a WiFi-
defined industry standard intended to provide a standard QoS solution until 802.11e
specification is ratified. This new capability is designed to improve the user experience of
voice, video, and audio applications over a Wi-Fi network. This mode for a VNS enables
the WMM capability on the SSID that is being offered. Therefore, the WMM IE (Information
Element) is included in the 802.11 beacon on the given SSID, allowing WMM clients such
as wireless VoIP handsets, PDAs, and wireless laptops to use WMM. This mode enables
prioritization of traffic in both downstream and upstream directions, but only for WMM
clients.
● Pre-WMM Priority – Does not enable WMM, but enables prioritization of the traffic in the
downstream direction at the AP for all clients (WMM or non-WMM) in the VNS.
● Pre-WMM and WMM Priority – Enables WMM, enabling prioritization of the traffic in the
downstream and upstream directions, but it also enables prioritization of the traffic in the
downstream direction for the non-WMM clients.
● Voice VNS w/o WMM – Forces the highest priority (AC_VO) for the traffic in the
downstream direction for all clients (WMM or non-WMM) in the VNS. This mode changes
the channel access parameters for the downstream direction in order to provide optimum
voice performance. With this mode, WMM is not enabled so there is no prioritization in the
upstream direction.
● Voice VNS with WMM – Forces the highest priority (AC_VO) for the traffic in the
downstream direction for all clients (WMM or non-WMM) in the VNS. This mode changes
the channel access parameters for the downstream and upstream directions in order to
provide optimum voice performance. With this mode, WMM is also enabled and there is
prioritization in the upstream direction for WMM clients. All non-WMM clients will use
AC_BE for upstream.
For the wired domain an Adaptive QoS mechanism is offered. With this mechanism, the original
QoS - TOS field (Diffserv/Precedence bits) of the original user packet is maintained end-to-end
within the CTP tunneling. This is achieved by copying the original TOS fields from the user
packet to the tunneled packet. The following diagram displays this process.
>
All traffic on this VNS will be prioritized to use AC_VO. This option is available
for backward compatibility purposes.
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