Timer Start Condition

Timer start condition: The timer T10 starts before the BSC sends a PHYSICAL_CONTEXT_REQUEST message to the BTS. • Timer stop condition: The timer T10 stops when the MS sends either an ASSIGNMENT_COMPLETE or an ASSIGNMENT_FAILURE message to the BSC. • Action performed on timer expiry: When the timer T10 expires, the BSC sends an ASSIGNMENT_FAILURE message to the MSC. • Appropriate value: Min. = 4 s. Max. = 30 s. Def. = 8 s. Rule = T10 > T3103, T10 > T3107 It is recommended that T10 be at least 2 seconds longer than T3107. T3103 Supervision of the internal handover procedure • Interpretation: The timer T3103 supervises the internal handover procedure. • Timer start condition: The timer T3103 starts when the BSC sends a HANDOVER_CMD message to the MS (via a BTS). • Timer stop condition: The timer T3103 stops when the BSC receives either a HANDOVER_CMPL message on the new channel or HANDOVER_FAILURE message on the old channel from the MS. • Action performed on timer expiry: When the timer T3103 expires, a CLEAR_REQ message is sent to the MSC and the new channel is released. Appropriate value: Min. = 3,5 s. Max. = 28 s. Def. = 6 s. Rule = T3103 < T10 T3107 Supervision of the assignment procedure • Interpretation: The timer T3107 supervises the assignment procedure and the internal intracell handover. • Timer start condition: The timer T3107 starts when the BSC sends an ASSIGNMENT_CMD message to the MS (via a BTS). • Timer stop condition: The timer T3107 stops when the BSC receives either an ASSIGNMENT_CMPL or ASSIGNMENT_FAILURE message from the MS. • Action performed on timer expiry: When the timer T3107 expires, the new and the old channel are released, all the appropriate MS connections are cleared, and an ASSIGNMENT_FAILURE message is sent to the MSC. In the case of the internal intracell handover, a CLEAR_REQUEST message is sent to the MSC.

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Transcript of Timer Start Condition

T3103 Supervision of the internal handover procedure• Interpretation: The timer T3103 supervises the internal handover procedure.• Timer start condition: The timer T3103 starts when the BSC sends aHANDOVER_CMD message to the MS (via a BTS).• Timer stop condition: The timer T3103 stops when the BSC receives either aHANDOVER_CMPL message on the new channel or HANDOVER_FAILUREmessage on the old channel from the MS.• Action performed on timer expiry: When the timer T3103 expires, aCLEAR_REQ message is sent to the MSC and the new channel is released.

Appropriate value:Min. = 3,5 s.Max. = 28 s.Def. = 6 s.Rule = T3103 < T10

T3107 Supervision of the assignment procedure• Interpretation: The timer T3107 supervises the assignment procedure and theinternal intracell handover.• Timer start condition: The timer T3107 starts when the BSC sends anASSIGNMENT_CMD message to the MS (via a BTS).• Timer stop condition: The timer T3107 stops when the BSC receives either anASSIGNMENT_CMPL or ASSIGNMENT_FAILURE message from the MS.• Action performed on timer expiry: When the timer T3107 expires, the new andthe old channel are released, all the appropriate MS connections are cleared,and an ASSIGNMENT_FAILURE message is sent to the MSC. In the case ofthe internal intracell handover, a CLEAR_REQUEST message is sent to theMSC.• Appropriate value:Min. = 3,5 s.Max. = 28 s.Def. = 6 s.Rule = T3107 < T10It is recommended that T10 be at least 2 seconds longer than T3107.