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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-14209-01
Chapter 6 Configuring Radio Settings
Enabling and Disabling Gratuitous Probe Response
Beginning in privileged EXEC mode, follow these steps to select the antennas the wireless device uses
to receive and transmit data:
Enabling and Disabling Gratuitous Probe Response
Gratuitous Probe Response (GPR) aids in conserving battery power in dual mode phones that support
cellular and WLAN modes of operation. GPR is available on 5-Ghz radios and is disabled by default.
You can configure two GPR settings:
• Period—This setting determines the time between GPR transmissions in Kusec intervals from 10 to
255 (similar to the beacon period)
• Speed—The speed is the data rate used to transmit the GPR
Selecting a longer period reduces the amount of RF bandwidth consumed by the GPR with the possibility
of shorter battery life. Selecting higher transmission speeds also reduces the amount of bandwidth
consumed but at the expense of a smaller cell size.
Beginning in privileged EXEC mode, follow these steps to enable GPR and set its parameters:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio { 0 | 1slot/port
}
Enter interface configuration mode for the radio interface. The
2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
The 802.11n 2.4-GHz radio is radio 0
The 802.11n 5-GHz radio is radio 1.
Step 3
gain dB Specifies the resultant gain of the antenna attached to the
device. Enter a value from –128 to 128 dB. If necessary, you
can use a decimal in the value, such as 1.5.
Note This setting does not affect the behavior of the wireless
device; it only informs the WLSE on your network of
the device’s antenna gain.
Step 4
antenna receive
{diversity | left | middle | right}
Set the receive antenna to diversity, left, middle, right, or all.
Note For best performance with two antennas, leave the
receive antenna setting at the default setting, diversity.
For one antenna, attach the antenna on the right and set
the antenna for right.
Step 5
antenna transmit
{diversity | left | right}
Set the transmit antenna to diversity, left, or right.
Note For best performance with two antennas, leave the
receive antenna setting at the default setting, diversity.
For one antenna, attach the antenna on the right and set
the antenna for right.
Step 6
end Return to privileged EXEC mode.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
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