T305 & T308 Timers in Nokia Siemens

[ASAP]

Hi

verifed with switch counterparts and they told below command

ZDFD:CMM,X:5AC0018,,N,W,; may work

but results will be in hexa and sometimes not visible.


Regards
Plannerguy

Yes that's true becuze you need to patch the UTPFIL but I think it's done under Rand D request

[parsarka]

Thank you somuch for the post.....will try it tomorow & let you know the result..thnx again!!

[parsarka]

This is hard coded timer but we can change
For Implementation value:- T305-3 second &T308-2 second
For Default value in system:- T305-30 second &T308-30 second

Hi Friend,Can you please provide me with the MML command/patch..guess this is a UTPFIL Param??

[parsarka]

Hi,I have implemented it but didnot find any improvement in Call Drop Rate....Any suggestions?

[ASAP]

can you send the output of this command?
ZDFD:CMM,1:5AC0018,,,;

[mirtunjay_1975]

Pleas find attached doc of T305&T308

T305/T308 Timer Trial


Objective of this Trial is to reduce the T305/T308 timer values at MSC end to improve the Network Drop Call Rate

MSC Timers Detail

T305: When MSC send DISC, and progress Indicator is not 8(Progress Indicator = 8 mean to trigger recorder information, start T306),T305 start.T305 stop when MSC receive Release message. If T305 expire, MSC send Release to MS

T308: After MSC sends Release, T308 start.T308 stop when MSC receive Release Complete. If T308 expire, MSC repeat Release and start T308 again. If T308 expire twice, MSC send Clear Command to BSC, forcing to release radio resource.

Proper T305 and T308 can avoid from radio drop after DISC message and decrease Drop call rate.

T305 and T308 at MSC should be set to lower from layer2 T200/N200 on the air interface that are used to ensure a successful transmission of a message (DISCONNECT and RELEASE in this case) to/from the mobile over the air interface.

The end user experience will not be affected by this change as the users would be trying to clear the call anyway

[mirtunjay_1975]

As per 3GPP Standards these Timer values are 30 sec.
/* timer durations in moc and mtc subautomatons */
dur_t_0408_t308_c = 3000; /* 30 sec */
dur_t_0408_t305_c = 3000; /* 30 sec */
These are default values, for this there won’t be any UTPFIL present. If you want to change you can use ZDFS command.

1) You have to identify the active CM unit

ZUSI:CM,;

2) You have to find the currenly used timer value in BSU related UTPFIL (5AC0018 is the BSU-UTPFIL file number)

ZDFD:CM,x:5AC0018,;

You should look for 32 01 3D 00 B8 0B 00 00 in case of T305 currently set to 30 seconds and 32 01 3C 00 B8 0B 00 00 for T308 also set to 30 seconds.

/ AIFPRB's identifier is 132 --> 32 01
T305 is identified as 3D --> 3D 00
T308 is coded as 3C --> 3C 00
30 seconds equals 3000 100th/sec --> h'BB8 --> B8 0B 00 00 /

3) Once you find the above presented values, you have to change them to

32 01 3D 00 90 01 00 00 for T305, this sets it to 4 seconds,
32 01 3C 00 C8 00 00 00 for T308, this changes it to 2 seconds,

by the command;

ZDFS:CM,x:5AC0018,y,::
where y represents the record number to be patched

Note: If the record
i) 32 01 3D 00 B8 0B 00 00 forT305
ii) 32 01 3C 00 B8 0B 00 00 for T308
can’t be found, please find the next free records and patch 32 01 3D 00 90 01 00 00 for T305 (4s), and 32 01 3C 00 C8 00 00 00 for T308 (2s).

[mirtunjay_1975]

Please find answer:-

With reducing T305/T308 timer at MSC end, when Party A Hangs-up the Call, T305/T308 timer will expire before RLT timer at BSS end

Call will not Peg as Drop Call

Party A Hangs up the Call on WILL
But Call pegged as Drop Call as RLT timer at BSS expires before MSC timer (T305/T308) expires

[mirtunjay_1975]

Please find output command
1) You have to identify the active CM unit

ZUSI:CM,;

2) You have to find the currenly used timer value in BSU related UTPFIL (5AC0018 is the BSU-UTPFIL file number)

ZDFD:CM,x:5AC0018,;

You should look for 32 01 3D 00 B8 0B 00 00 in case of T305 currently set to 30 seconds and 32 01 3C 00 B8 0B 00 00 for T308 also set to 30 seconds.

/ AIFPRB's identifier is 132 --> 32 01
T305 is identified as 3D --> 3D 00
T308 is coded as 3C --> 3C 00
30 seconds equals 3000 100th/sec --> h'BB8 --> B8 0B 00 00 /

3) Once you find the above presented values, you have to change them to

32 01 3D 00 90 01 00 00 for T305, this sets it to 4 seconds,
32 01 3C 00 C8 00 00 00 for T308, this changes it to 2 seconds,

by the command;

ZDFS:CM,x:5AC0018,y,::
where y represents the record number to be patched

Note: If the record
i) 32 01 3D 00 B8 0B 00 00 forT305
ii) 32 01 3C 00 B8 0B 00 00 for T308
can’t be found, please find the next free records and patch 32 01 3D 00 90 01 00 00 for T305 (4s), and 32 01 3C 00 C8 00 00 00 for T308 (2s).

[mirtunjay_1975]

yes you are saying true