EHOSR
8
Timers for Enhanced Handover Success Rate I would like to receive following information: If yes what value? 25 or the recommended 49? Table 1 MSC Timers 15 49 15 49 15 49 to printout: THNDCMDBASICM DATABASE TABLE BLOCK TAB TABLE WRAPPED PARA AXEPARS YES Hello! We are to implement Enhanced Handover Success Rate on a client. 1. How to to retrieve the values for timers (in red) bellow? I only got the HNDTCMDBASNON by MGEPP; 2.HNDTCMDBASNON is equal to 20 sec.. And sum of the default values T8 (BSS(BSSMAP))+T_ESTGUARD+T_REESTABLISH+T_REESTGUARD is equal to 23sec. If the sum is really 23 sec, is it really recommended to change the three MSC timers for a higher value? Parameter Name Default Value Recommended Value 1 Value Range Unit TIMHNDCMDINTRAM 5 to 120 s HNDTCMDBASNON 5 to 120 s THNDCMDBASICM 5 to 120 s 1The MSC Timers must be bigger than the sum T8 (BSS(BSSMAP))+T_ESTGUARD+T_REESTABLISH+T_REESTGUARD in order not to time out while Enhanced Handover Success Rate is used. Thank you! Posted: 2 View Prop <DBTSP:TAB=AXEPARS,NAME =THNDCMDBASICM;
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Transcript of EHOSR
Timers for Enhanced Handover Success Rate
I would like to receive following information:
If yes what value? 25 or the recommended 49?
Table 1 MSC Timers
Default Value
15 49
15 49
15 49
to printout:
THNDCMDBASICM
DATABASE TABLE
PARA AXEPARS YES
Hello! We are to implement Enhanced Handover Success Rate on a client.
1. How to to retrieve the values for timers (in red) bellow? I only got the HNDTCMDBASNON by MGEPP;
2.HNDTCMDBASNON is equal to 20 sec.. And sum of the default values T8 (BSS(BSSMAP))+T_ESTGUARD+T_REESTABLISH+T_REESTGUARD is equal to 23sec. If the sum is really 23 sec, is it really recommended to change the three MSC timers for a higher value?
Parameter Name
Recommended Value1
Value Range Unit
TIMHNDCMDINTRAM 5 to 120 s
HNDTCMDBASNON 5 to 120 s
THNDCMDBASICM 5 to 120 s
1The MSC Timers must be bigger than the sum T8 (BSS(BSSMAP))+T_ESTGUARD+T_REESTABLISH+T_REESTGUARD in order not to time
out while Enhanced Handover Success Rate is used.
Thank you!
Posted: 2008-02-18 14:58 by Marcelo SedaView Properties
<DBTSP:TAB=AXEPARS,NAME=THNDCMDBASICM;
BLOCK TAB TABLE WRAPPED
NAME SETNAME PARID VALUE UNIT CLASS DISTRIB
END
TIMHNDCMDINTRAM
DATABASE TABLE
PARA AXEPARS YES
END
HNDTCMDBASNON
DATABASE TABLE
PARA AXEPARS YES
END
<
THNDCMDBASICM GSM1APTC 1642 15 SEC CUSTOM IMMED
STATUS FCVSET FCVALUE DCINFO FCODE
UPDATED FALSE 15 UNDEF 0
<DBTSP:TAB=AXEPARS,NAME=TIMHNDCMDINTRAM;
BLOCK TAB TABLE WRAPPED
NAME SETNAME PARID VALUE UNIT CLASS DISTRIB
TIMHNDCMDINTRAM GSM1APTC 1638 15 SEC CUSTOM IMMED
STATUS FCVSET FCVALUE DCINFO FCODE
UPDATED FALSE 15 UNDEF 0
<DBTSP:TAB=AXEPARS,NAME=HNDTCMDBASNON;
BLOCK TAB TABLE WRAPPED
Show Quoted Messages
PROCEDURE:
1. TEST SYSTEM;
Posted: 2008-07-22 14:34 by Marcelo SedaView Properties
To check these timers, the TEST SYSTEM needs to be used.
T8:
PRINT VAR RMHOEB 82; ! CT8 !
END TEST;2. T8 = (CT8 - 2) / 2 CT8 = 2 + 2*T8*100/ZINTERVAL; ! ZINTERVAL = 100 !
Obs.: It is measured in seconds. Default value is 25.
T70:1. TEST SYSTEM; PRINT VAR RMHOEB 80; ! CT70 !
END TEST;2. T70 = (CT70 - 2) / 2
CT70 = 2 + 2*T70*100/ZINTERVAL; ! ZINTERVAL = 100 !
Obs.: It is measured in seconds. Default value is 6.
T75:1. TEST SYSTEM; PRINT VAR RMHOEB 81; ! CT75 !
END TEST;2. T75 = (CT75 - 2) / 2
CT75 = 2 + 2*T75*100/ZINTERVAL; ! ZINTERVAL = 100 !
Obs.: It is measured in seconds. Default value is 10.
T_ESTGUARD:1. TEST SYSTEM; PRINT VAR RMHOEB 177; ! CTESTGUARD !
END TEST;2. T_ESTGUARD = (CTESTGUARD - 2) / 2
CTESTGUARD = 2 + 2*T_ESTGUARD*100/ZINTERVAL ! ZINTERVAL = 100 !
Obs.: It is measured in seconds. Default value is 10.
T_REESTABLISH:1. TEST SYSTEM; PRINT VAR RMHOEB 178; ! CTREESTABLISH !
END TEST;2. T_REESTABLISH = (CTREESTABLISH - 2) / 2
CTREESTABLISH = 2 + 2*T_REESTABLISH*100/ZINTERVAL ! ZINTERVAL = 100 !
Obs.: It is measured in seconds. Default value is 12.
T_REESTGUARD:
1. TEST SYSTEM; PRINT VAR RMHOEB 179; ! CTREESTGUARD !
END TEST;
T8:
T70:
2. T_REESTGUARD = (CTREESTGUARD - 2) / 2
CTREESTGUARD = 2 + 2*T_REESTGUARD*100/ZINTERVAL ! ZINTERVAL = 100 !
Obs.: It is measured in seconds. Default value is 1.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Guard timer for establishment of external BSC HANDOVER. Started in originating BSC by receiving 'HO_CMD' from MSC and stopped by reception of 'CLEAR_CMD' from MSC or by 'EST_IND' from originating BTS.
T75:
T_ESTGUARD:
T_REESTABLISH:
The T70 is started when the first HANDOVER REQUIRED message is sent to the MSC for a connection. For each connection up to N70 HANDOVER REQUIRED messages may be sent during the time T70. When the timer T70 has elapsed it is restarted when the next HANDOVER REQUIRED message is sent to the MSC for the connection.
Guard timer for external HANDOVER request. Started in originating BSC by sending 'HO_REQ' to MSC and stopped by reception of HO_CMD', 'HO_REQ_REJ'.
Guard timer to give the MS a chance to come up on the new channel (ESTABLISH INDICATION) or return to the old channel (HANDOVER FAILURE). The timer is started at reception of ERROR INDICATION with the cause 'T200 expired N200 + 1 times' from the originating BTS.
T_REESTGUARD:
Time to try to force the MS back to the old channel by means of sending ESTABLISH REQUEST. If the ESTABLISH REQUEST result in an ERROR INDICATION with the cause 'T200 expired N200 + 1 times' from the BTS then ESTABLISH REQUEST may be sent again as long as the timer T_REESTABLISH is running. The timer is started at expiry of T_ESTGUARD and stopped at reception of ESTABLISH CONFIRM from the originating BTS.
Guard timer to wait for ESTABLISH CONFIRM before the connection is released. The timer is started at expiry of the T_REESTABLISH timer. The MS is concidered as lost at timer expiry, or at reception of ERROR INDICATION, and connection release is initiated.
