Meaning Enabled/Disabled Fast Dormancy In S3 - Galaxy S III Q&A, Help & Troubleshooting

Can anyone let me meaning of enabled/disabled fast dormancy..Actually what use this fast dormancy and its workout???

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There are literally dozens of threads about this but it may be hard to get the needed information since many clueless people spread misinformation about fd.
First of, fd has something to do with data network and is only relevant in 3G (including HSPA) networks.
2G (Gprs, Edge) do not have such a feature.
3G network use a very high frequency which directly means that they need more power per second than 2G but also have a higher throughput rate, making it's power/work ratio lower (=better) than 2G.
However there is an issue with this feature: even when not actually in usage it drains your battery far too quickly.
Now, noone might care if you were to tranfer data non-stop but mobile phones have a history of idling 99% of their life.
One might say "hey let's go back to 2G when there is little to no activity" but unfortunately that won't work since 3g and 2g (in fact all generations) are incompatible to each other which causes a brief interruption in connectivity and closes all open connections.
As a result the network engineers decided to opt for a technique they called fd and which basically turns off 3G.
Usually when a phone connects to a 3g network it has to run through a long, complicated and time-consuming handshake process in which it is attributed, amongst others, the IP adress. These details are all discarded when the connection is lost or cleanly disconnected.
(Note: changing antenna is not considered a lost connection but uses a special soft- or hard-failover protocol)
So if the phone was to just turn off the 3g it would not work but there needs to be a consentual agreement with the network antenna to keep the data in store and reserve the resources attributed with the phone.
Now we can turn 3g off and save battery, knowing that we can revive the connection anytime we havo to send data.
(Naturally if we keep the connction offline for some time the network will just assume we lost data connectivity and free the resources anyway)
However what about receiving data (most notably Google C2DM long-polling)?
To receive data we have to turn the 3g network on again (wake up from fd) and request any pending packets the network temporarely delayed for us. If data is present, the phone completely wakes up from fd, otherwise it will go straight back to fd.
The interval between 2 polls is provider-dependant and is roughly 5 to 30 seconds of sleep time.
In a nutshell
-fd delays incoming data by up to poll-interval seconds
-if the interval is too low, fd will not save power
- if the networ does not support fd, the battery drains faster thao with fd disabled
- fd usually saves a lot of battery
-fd causes a lag on the first outgoing byte of a transmission
Sent from my GT-I9300 using xda premium

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d4fseeker said:
There are literally dozens of threads about this but it may be hard to get the needed information since many clueless people spread misinformation about fd.
First of, fd has something to do with data network and is only relevant in 3G (including HSPA) networks.
2G (Gprs, Edge) do not have such a feature.
3G network use a very high frequency which directly means that they need more power per second than 2G but also have a higher throughput rate, making it's power/work ratio lower (=better) than 2G.
However there is an issue with this feature: even when not actually in usage it drains your battery far too quickly.
Now, noone might care if you were to tranfer data non-stop but mobile phones have a history of idling 99% of their life.
One might say "hey let's go back to 2G when there is little to no activity" but unfortunately that won't work since 3g and 2g (in fact all generations) are incompatible to each other which causes a brief interruption in connectivity and closes all open connections.
As a result the network engineers decided to opt for a technique they called fd and which basically turns off 3G.
Usually when a phone connects to a 3g network it has to run through a long, complicated and time-consuming handshake process in which it is attributed, amongst others, the IP adress. These details are all discarded when the connection is lost or cleanly disconnected.
(Note: changing antenna is not considered a lost connection but uses a special soft- or hard-failover protocol)
So if the phone was to just turn off the 3g it would not work but there needs to be a consentual agreement with the network antenna to keep the data in store and reserve the resources attributed with the phone.
Now we can turn 3g off and save battery, knowing that we can revive the connection anytime we havo to send data.
(Naturally if we keep the connction offline for some time the network will just assume we lost data connectivity and free the resources anyway)
However what about receiving data (most notably Google C2DM long-polling)?
To receive data we have to turn the 3g network on again (wake up from fd) and request any pending packets the network temporarely delayed for us. If data is present, the phone completely wakes up from fd, otherwise it will go straight back to fd.
The interval between 2 polls is provider-dependant and is roughly 5 to 30 seconds of sleep time.
In a nutshell
-fd delays incoming data by up to poll-interval seconds
-if the interval is too low, fd will not save power
- if the networ does not support fd, the battery drains faster thao with fd disabled
- fd usually saves a lot of battery
-fd causes a lag on the first outgoing byte of a transmission
Sent from my GT-I9300 using xda premium
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This was really helpful.
Thank you.
here goes a click on the Thanks button.