H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 36)

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Step Command Remarks
1. Enter system view. system-view N/A
2. Enable automatic creation of
radio policies.
wlan radio-policy auto-create
Optional.
By default, automatic creation of
radio policies is disabled.
Configuring 802.11n
As the next generation wireless LAN technology, 802.11n supports both 2.4GHz and 5GHz bands. It
provides higher-speed services to customers by using the following methods:
1. Increasing bandwidth: 802.11n can bond two adjacent 20-MHz channels together to form a
40-MHz channel. During data forwarding, the two 20-MHz channels can work separately with
one acting as the primary channel and the other as the secondary, or the channels work together
as a 40-MHz channel. With this flexibility, the data forwarding rate can be doubled.
2. Improving channel utilization through the following ways:
{
802.11n introduces the A-MPDU frame format. By using only one PHY header, each A-MPDU
can accommodate multiple Message Protocol Data Units (MPDUs) which have their PHY
headers removed. This reduces the overhead in transmission and the number of ACK frames to
be used, and improves network throughput.
{
Similar with MPDU aggregation, multiple MAC Service Data Units (MSDU) can be aggregated
into a single A-MSDU. This reduces the MAC header overhead and improves MAC layer
forwarding efficiency.
{
To improve physical layer performance, 802.11n introduces the short GI function, which
shortens the GI interval of 800 us in 802.11a/g to 400 us. This can increase the data rate by
10 percent.
To configure 802.11n:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter AP template view.
wlan ap ap-name [ model
model-name [ id ap-id ] ]
The model name is needed only
when you create a new AP
template.
3. Enter radio view.
radio radio-number type { dot11an |
dot11gn }
N/A
4. Specify the bandwidth mode
for the radio.
channel band-width { 20 | 40 }
Optional.
By default, the 802.11an radio
operates in 40 MHz mode and
the 802.11gn radio operates in
20 MHz mode.
5. Enable access permission for
802.11n clients only.
client dot11n-only
Optional.
By default, an 802.11an radio
permits both 802.11a and
802.11an clients to access, and
an 802.11gn radio permits both
802.11b/g and 802.11gn
clients to access.