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radio settings: document FastDormancy property

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Mika Liljeberg 2010-10-25 16:28:06 +03:00 committed by Marcel Holtmann
parent 8da7e98ce4
commit 7671f4d091
1 changed files with 40 additions and 17 deletions
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doc/radio-settings-api.txt
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@ -44,22 +44,45 @@ Properties string TechnologyPreference [read-write]
boolean FastDormancy [read-write, optional]
This property will enable or disable fast
dormancy. Fast dormancy refers to UE initiated
release of radio resources quickly after a
burst of data transfer has ended. Normally,
This property will enable or disable the fast
dormancy feature in the modem. Fast dormancy
refers to a modem feature that allows the
modem to quickly release radio resources after
a burst of data transfer has ended. Normally,
radio resources are released by the network
after a timeout configured by the network
operator. Fast dormancy allows the modem to
release radio resources more quickly.
Typically, fast dormancy would be enabled if
no data transfer is predicted to occur in the
near future, for instance, when the end user
is not actively using the device. This is a
major power-saving feature for mobile devices,
but can be ignored for USB sticks or PCI
devices.
after a timeout configured by the network.
Fast dormancy allows the modem to release the
radio resources more quickly.
If the modem does not support such a feature
the property should never be exposed to the
user.
Fast dormancy is a major power-saving feature
for mobile devices. Typically, fast dormancy
would be enabled when the device is not being
interactively used by a human user and only
networking applications with keep-alive
traffic are active (e.g. mail client or a
presence application). In this case it is
desirable to release radio resources quickly
after a keep-alive transaction has ended,
since typically no network traffic will occur
until the next keep-alive transaction. Fast
dormancy should not be enabled during
interactive use because the release and setup
of radio resources introduces perceivable
delay for the end user.
The fast dormancy implementation in the modem
is vendor specific. The implementation should
try to release radio resources more quickly,
when the situation allows it, but should also
take care not to increase the signalling load
on the cellular network by releasing and
re-establishing radio resources too often. The
modem should adjust its behaviour to the 3GPP
release supported by the network and the
parameters set by the operator.
Fast dormancy can be ignored for externally
powered modems such as USB sticks or PCI
devices. If the modem does not support such a
feature the property should never be exposed
to the user.