E******* HSDPA optimization

[a19997104]

hello experts, i need help with these parameters:

downswitchTimer: Time after which a connection with low throughput is downswitched from dedicated channel to FACH/RACH.
Once the throughput on both the uplink and downlink has fallen below the value of downswitchThreshold, a downswitch to FACH/RACH is normally requested after this length of time. However, the downswitch is not requested if the throughput has subsequently increased above the value of downswitchTimerThreshold.
If CELL_FACH state is not available, the connection is switched down to IDLE state.
Special values:
0 is used to disable traffic-volume-initiated channel switching from dedicated channel to FACH/RACH.

hsdschInactivityTimer: Time after which a connection with low throughput is downswitched from HS-DSCH to CELL_FACH.
Once the throughput on both the uplink and downlink has fallen below the value of downswitchThreshold, a downswitch to FACH/RACH is normally requested after this length of time. However, the downswitch is not requested if the throughput has subsequently increased above the value of downswitchTimerThreshold. If CELL_FACH state is not available, the connection is switched down to IDLE state. Applicable only for radio connections without CPC.

basically whats the difference? i have found that in my network the PS calls make transition just after the RAB assigment, and the cause is "hs-dsch inactivity timer expire", its set to 2seconds (default E/// value)

[jackkarpar]

In my opinion, the first one is downswitch from dch to fach/idle, and the second is downswitch from HS-DSCH to fach/idle. they're for different UE state.

[a19997104]

In my opinion, the first one is downswitch from dch to fach/idle, and the second is downswitch from HS-DSCH to fach/idle. they're for different UE state.

to which value do you have the parameter hsdschInactivityTimer? this is causing that the users feel very low throughput at the beggining of the call

[topoffenders]

downswitchTimer : triggered due to Small data transaction which is not required HS connection.
hsdschInactivityTimer : tiggered due to user in activity, beside network setting, it is also depend on Phone manufactures implementation, some phone do it quickly to save battery. (refer to fast dormancy)