Cisco Cisco Cius 4G 디자인 가이드
Cisco Cius Wireless Deployment Guide
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QoS Basic Service Set (QBSS)
There are three different versions of QoS Basic Service Set (QBSS) that Cisco Cius supports.
The first version from Cisco was on a 0-100 scale and was not based on clear channel assessment (CCA), so it does not account
for channel utilization, but only the 802.11 traffic traversing that individual access point’s radio. So it does not account for
other 802.11 energy or interferers using the same frequencies. The max threshold is defined on the client side, which is set to
45.
QBSS is also a part of 802.11e, which is on a 0-255 scale and is CCA based. So this gives a true representation on how busy
the channel is. The max threshold is also defined on the client side, which is set to 105.
Cisco Cius converts the QBSS info to a percentage format (0-255 to 0-100%), which is displayed as the Channel Utilization
value in the neighbor list menu.
The second version from Cisco is based on the 802.11e version, but allows the default max threshold of 105 to be optionally
configured.
The first version from Cisco was on a 0-100 scale and was not based on clear channel assessment (CCA), so it does not account
for channel utilization, but only the 802.11 traffic traversing that individual access point’s radio. So it does not account for
other 802.11 energy or interferers using the same frequencies. The max threshold is defined on the client side, which is set to
45.
QBSS is also a part of 802.11e, which is on a 0-255 scale and is CCA based. So this gives a true representation on how busy
the channel is. The max threshold is also defined on the client side, which is set to 105.
Cisco Cius converts the QBSS info to a percentage format (0-255 to 0-100%), which is displayed as the Channel Utilization
value in the neighbor list menu.
The second version from Cisco is based on the 802.11e version, but allows the default max threshold of 105 to be optionally
configured.
Each version of QBSS can be optionally be configured on the access point.
For the Cisco Unified Wireless LAN Controller, enabling WMM will enable the 802.11e version of QBSS. There are also the
7920 Client CAC and 7920 AP CAC options, where 7920 Client CAC will enable Cisco version 1 and 7920 AP CAC enables
Cisco version 2. See the
For the Cisco Unified Wireless LAN Controller, enabling WMM will enable the 802.11e version of QBSS. There are also the
7920 Client CAC and 7920 AP CAC options, where 7920 Client CAC will enable Cisco version 1 and 7920 AP CAC enables
Cisco version 2. See the
SSID / WLAN QoS Settings
section for more info.
For the Cisco Autonomous Access Point, dot11 phone or dot11 phone dot11e will enable QBSS.
Dot11 phone will enable the 2 Cisco versions, where dot11 phone dot11e will enable both CCA versions (802.11e and Cisco
version 2). It is recommended to enable dot11 phone dot11e.