H3C Technologies H3C MSR 50 User Manual

Page 26

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17

As the next generation wireless LAN technology, 802.11n supports both 2.4-GHz and 5-GHz bands. It

provides higher throughput by using the following methods:

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 acting as the secondary channel or working together

as a 40-MHz channel. This provides a simple way of doubling the data rate.

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 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 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 ns in 802.11a/g to 400 ns. This can increase the data rate by

10 percent.

To configure 802.11n:

Step Command

Remarks

91.

Enter system view.

system-view

N/A

92.

Enter AP template view.

wlan ap ap-name [ model
model-name [ id ap-id ] ]

Specify the model name only when
you create an AP template.

93.

Enter radio view.

radio radio-number type { dot11an
| dot11gn }

N/A

94.

Specify the bandwidth mode
for the radio.

channel band-width { 20 | 40 }

Optional.
By default, the 802.11gn radio

operates in 20 MHz mode.

95.

Enable access permission

only for 802.11n clients .

client dot11n-only

Optional.
By default, an 802.11gn radio

permits both 802.11b/g and
802.11gn clients to access.

96.

Enable the short GI function.

short-gi enable

Optional.
By default, the short GI function is

enabled.

97.

Enable the A-MSDU function. a-msdu enable

Optional.
By default, the A-MSDU function is

enabled.
The device receives but does not
send A-MSDUs.

98.

Enable the A-MPDU function. a-mpdu enable

Optional.
By default, the A-MPDU function is
enabled.

For information about Modulation and Coding Scheme (MCS) index and mandatory and supported

802.11n rates, see "Configuring WLAN RRM."

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