HP ProCurve Switch / Wireless - Using 802.11e and WMM on the ProCurve Wireless Edge Services Module

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An HP ProCurve Networking Application Note

Using 802.11e and WMM on the ProCurve

Wireless Edge Services Module

Contents

1. Introduction ................................................................................................................................................................. 2

2. Details of the WMM protocol ...................................................................................................................................... 2

3. Implementing WMM on a ProCurve WESM .............................................................................................................. 2

3.1 Activate WMM ......................................................................................................................................................... 3

3.2 Change WMM mapping ........................................................................................................................................... 4

3.3 Modify WLAN prioritization mode and AC queue parameters ................................................................................. 5

3.4 Configure admission control .................................................................................................................................... 6

3.5 General configuration tips ....................................................................................................................................... 7

4. WMM implementation by telephony vendors ........................................................................................................... 7

5. U-APSD ......................................................................................................................................................................... 7

6. Reference documents ................................................................................................................................................. 8

Summary of content (8 pages)

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An HP ProCurve Networking Application Note Using 802.11e and WMM on the ProCurve Wireless Edge Services Module Contents 1. Introduction ................................................................................................................................................................. 2 2. Details of the WMM protocol ...................................................................................................................................... 2 3. Implementing WMM on a ProCurve WESM ...
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 1. Introduction IEEE 802.11e is an enhancement to the 802.11 standard that adds Quality of Service for wireless LAN applications such as Voice over Wireless LAN (VoWLAN) or IP Streaming Multimedia. This important standard has been added to the published 802.11-2007 standard. WMM, which stands for WiFi MultiMedia, is also known as WME (Wireless Multimedia Extensions). It is a WiFi Alliance interoperability certification based on the 802.
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 3.1 Activate WMM To activate WMM for a WLAN: 1. Go to the web interface of the Wireless Edge Services Module. In the Network Setup > WLAN Setup > Edit screen, go to the Advanced section and choose Automatic/WMM: 2. Click OK to accept Automatic/WMM as the Access Category. Wireless traffic is placed in the four queues according to its 802.1p priority (default) or DSCP value.
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 3.2 Change WMM mapping To change the WMM mapping: 1. Go to the WMM menu, select a Queue for a particular WLAN to get to the WLAN Setup window, and click QoS Mappings. You see the QoS Mappings window, where you can change mapping: 2. Click OK to accept any changes.
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 3.3 Modify WLAN prioritization mode and AC queue parameters You can also modify the prioritization mode and AC queue parameters for the WLAN. For instance, by default the prioritization mode is 802.1p (Layer-2 priority) but you can also set it to DSCP. To modify this setting: 1. From the Network Setup > WLAN Setup menu click on the WMM tab to display the list of access categories for each WLAN.
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 2. To modify the WMM parameter for an access category, highlight the category and click Edit at the bottom left of the screen. You see the Edit WMM window: 3. From the same window you can also configure the QoS parameters: AIFSN, Transmit Ops, CW Minimum, CW Maximum 3.4 Configure admission control Finally, you can configure admission control, to limit the number of wireless stations that can use the same QoS settings at the same time.
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 3.5 General configuration tips • Low AIFSN and low CWmin will provide low latency, high throughput. • By default, high-priority queues on the radio port use AIFSN=1ms; high-priority queues on stations use AIFSN= 2ms. • If Transmit Ops is too high, a station can use the medium for a long time and other traffic may be delayed. Generally Transmit Ops is best set to a maximum of 100ms.
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Using 802.11e and WMM on the ProCurve Wireless Edge Services Module 6. Reference documents For further information about how to configure ProCurve equipment to support mobility, please refer to the following links: • For the ProCurve Wireless Edge Services Module Management and Configuration Guide: http://cdn.procurve.com/training/Manuals/WESM-zl-MgmtCfg-Feb2008-59918626.pdf In particular, be sure to read chapter 4 of this Management and Configuration Guide. • For other references about WMM: http://en.