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Handover algorithms with Timer

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  • 1. Procedure & Timer Original Call (normal – No OACSU) MS ST3126 ET3126 Channel Request UI Immediately Assignment SABM [L3 Inf.] BTS Channel Required BSC Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. ST3101 Establish Indication [L3 Inf.] Unnumbered Acknowledge Authentication Request Authentication Response Identification Request Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Complete Setup Call Proceed Authentication Request Authentication Response Identification Request Identification Response Assignment Complete Identification Request ET3270 Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete Setup Call Proceed Call Proceed Assignment Command Authentication Response ST3270 Setup Channel Activation Acknowledge Unnumbered Acknowledge ET3260 TMSI Reallocation Complete ET3250 Channel Activation TCH SCCP Connect Confirm Authentication Request Ciphering Mode Complete TMSI Reallocation Cmd. SCCP Connect Required [L3] ST3260 Ciphering Mode Cmd. Physical Context Request SABM (FACCH) ET3101 ST9105 ET9105 Physical Context Confirm Assignment Command MSC Assignment Request ST9108 ET9108 ST9103 ET9103 ST3107 Release Request (SDCCH) Establish Indication Assignment Complete ET3107 Assignment Complete RF Channel Release (SDCCH) RF Channel Release Acknowledge Alerting Connect Connect Acknowledge Alerting Connect Connect Acknowledge Alerting Connect Connect Acknowledge 1
  • 2. Procedure & Timer Original Call (normal – OACSU) MS ST3126 ET3126 Channel Request UI Immediately Assignment SABM [L3 Inf.] BTS BSC Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. ST3101 Establish Indication [L3 Inf.] Unnumbered Acknowledge Authentication Request Authentication Response Identification Request Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Complete Setup Call Proceed Alerting Authentication Request Authentication Response Identification Request Identification Response Assignment Complete Identification Request ET3270 Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete Setup Call Proceed Call Proceed Alerting Alerting Assignment Command Authentication Response ST3270 Setup Channel Activation Acknowledge Unnumbered Acknowledge ET3260 TMSI Reallocation Complete ET3250 Channel Activation TCH SCCP Connect Confirm Authentication Request Ciphering Mode Complete TMSI Reallocation Cmd. SCCP Connect Required [L3] ST3260 Ciphering Mode Cmd. Physical Context Confirm SABM (FACCH) ET3101 ST9105 ET9105 Physical Context Request Assignment Command MSC Channel Required Assignment Request ST9108 ET9108 ST9103 ET9103 ST3107 Release Request (SDCCH) Establish Indication Assignment Complete ET3107 Assignment Complete RF Channel Release (SDCCH) RF Channel Release Acknowledge Connect Connect Acknowledge Connect Connect Acknowledge Connect Connect Acknowledge 2
  • 3. Procedure & Timer Original Call (TCH Congestion) MS ST3126 ET3126 Channel Request UI Immediately Assignment SABM [L3 Inf.] BTS Channel Required BSC Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. ST3101 Establish Indication [L3 Inf.] Unnumbered Acknowledge ET3101 ST9105 ET9105 Authentication Request Authentication Response Identification Request Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Complete Setup Call Proceed MSC Authentication Request Authentication Response Identification Request Identification Response Authentication Request ET3260 Identification Request ET3270 Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete ET3250 Setup TMSI Reallocation Complete Setup Call Proceed Call Proceed Channel Release Authentication Response ST3270 Ciphering Mode Complete * Physical Context Request * SCCP Connect Confirm ST3260 Ciphering Mode Cmd. TMSI Reallocation Cmd. SCCP Connect Required [L3] Assignment Request ST11 ET11 Queuing Indication Clear Request Clear Command Channel Release Disconnect Frame Deactivate SACCH Unnumbered Acknowledge Release Indication Clear Confirm RF Channel Release RF Channel Release Acknowledge Released Release Complete 3
  • 4. Procedure & Timer Directed Retry MS ST3126 ET3126 BTS Channel Request BSC Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. ST3101 UI Immediately Assignment SABM [L3 Inf.] Establish Indication [L3 Inf.] ET3101 ST9105 Unnumbered Acknowledge ET9105 Authentication Request Authentication Request Authentication Response ET3260 ET3270 Ciphering Mode Complete TMSI Reallocation Complete TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete ET3250 Setup Setup Call Proceed Assignment Request ST11 ET11 ST9103 Channel Activation TCH T T Channel Activation Acknowledge ET9103 ST3124 ET3124 Handover Command S Handover Access T Physical Information ST3103 Queuing Indication At this time a handover alarm is raised and a target BTS is selected. Handover Detection T SABM (FACCH) T Unnumbered Acknowledge Establish Indication T Handover Complete T Handover Complete S S Alerting Connect ET3103 RF Channel Release (SDCCH) Assignment Complete RF Channel Release Acknowledge Alerting T T Connect Acknowledge TMSI Reallocation Complete Setup Call Proceed Call Proceed Identification Response Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Cmd. Authentication Response Ciphering Mode Cmd. Ciphering Mode Cmd. Ciphering Mode Complete Authentication Request ST3270 Identification Response Ciphering Mode Cmd. SCCP Connect Confirm Identification Request Identification Request Identification Response SCCP Connect Required [L3] ST3260 Authentication Response Identification Request Handover Command MSC Channel Required Connect T Connect Acknowledge Alerting Connect Connect Acknowledge 4
  • 5. Procedure & Timer Assignment Failure (T3107 expire) MS ST3126 ET3126 Channel Request UI Immediately Assignment SABM [L3 Inf.] BTS Channel Required BSC Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. ST3101 Establish Indication [L3 Inf.] ET3101 Unnumbered Acknowledge ST9105 ET9105 Authentication Request Authentication Response Identification Request Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Complete Setup Call Proceed SCCP Connect Confirm ST3260 Authentication Response ET3260 Authentication Response Identification Request Identification Request ST3270 Identification Response ET3270 Identification Response Ciphering Mode Cmd. Ciphering Mode Cmd. Ciphering Mode Complete Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete ET3250 Setup TMSI Reallocation Complete Setup Call Proceed Call Proceed Assignment Request ST9108 Physical Context Confirm ET9108 Channel Activation TCH ST9103 Channel Activation Acknowledge Assignment Command SCCP Connect Required [L3] Authentication Request Authentication Request Physical Context Request Assignment Command MSC ET9103 ST3107 ET3107 ST9110 ET9110 Assignment Failure Clear Command Clear Complete RF Channel Release RF Channel Release Acknowledge Released Released Complete 5
  • 6. Procedure & Timer Mobile Terminating Call MS BTS Paging Request ST3126 ET3126 Channel Request UI Immediately Assignment SABM [Paging response] Unnumbered Acknowledge BSC Paging Paging Command Channel Required Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. ST3101 Establish Indication [Paging Response] ET3101 ST9105 ET9105 Authentication Request Authentication Response Identification Request Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Complete Setup Call Proceed Authentication Request Authentication Response Identification Request Identification Response Unnumbered Acknowledge Assignment Complete ET3270 Assignment Command Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete Setup Call Proceed Call Proceed Channel Activation Acknowledge Authentication Response Identification Request Setup Channel Activation TCH Authentication Request ST3270 TMSI Reallocation Complete ET3250 Physical Context Confirm SABM (FACCH) ET3260 Ciphering Mode Complete TMSI Reallocation Cmd. SCCP Connect Required [Paging Response] SCCP Connect Confirm ST3260 Ciphering Mode Cmd. Physical Context Request Assignment Command MSC Assignment Request ST9108 ET9108 ST9103 ET9103 ST3107 Release Request (SDCCH) Establish Indication Assignment Complete ET3107 Assignment Complete RF Channel Release (SDCCH) RF Channel Release Acknowledge Alerting Connect Connect Acknowledge Alerting Connect Connect Acknowledge Alerting Connect Connect Acknowledge 6
  • 7. Procedure & Timer Location Updating MS ST3126 BTS Channel Request BSC Channel Activation ST9103 Channel Activation Acknowledge ET9103 Immediately Assignment Cmd. UI Immediately Assignment ST3101 ET3126 SABM [Location Update Request] Establish Indication ST3210 [Location Update request] ET3101 Unnumbered Acknowledge ST9105 ET9105 Authentication Request Authentication Response Identification Request Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. TMSI Reallocation Complete ET3210 Location Update Accept Channel Release Disconnect MSC Channel Required Authentication Request Authentication Response Identification Request Identification Response ET3260 Authentication Response Identification Request ET3270 Identification Response Ciphering Mode Cmd. Ciphering Mode Complete TMSI Reallocation Cmd. ST3250 TMSI Reallocation Complete ET3250 Channel Release Authentication Request ST3270 Ciphering Mode Complete Location Update Accept SCCP Connect Confirm ST3260 Ciphering Mode Cmd. TMSI Reallocation Cmd. SCCP Connect Required [Location Update Request] TMSI Reallocation Complete Location Update Accept Clear Command Deactivation SACCH Unnumbered Acknowledge Release Indication RF Channel Release (SDCCH) Clear Confirm RF Channel Release Acknowledge Released Released Complete 7
  • 8. Procedure & Timer Internal Handover (Intra Cell) MS BTS BSC MSC Measurement Report Measurement Result OCh OCh NCh NCh OCh Assignment Command SABM NCh OCh NCh Unnumbered Acknowledge Assignment Complete NCh NCh Physical Context Request Physical Context Confirm Channel Activation Channel Activation Acknowledge Assignment Command ST9108 ET9108 ST9103 ET9103 ST3107 Establish Indication Assignment Complete RF Channel Release RF Channel Release Acknowledge ET3107 Handover Performed ST_RCR_ACK ET_RCR_ACK Internal Handover (Inter Cell  Synchronous) MS BTSServing Measurement Report BTSTarget BSC MSC Measurement Result Physical Context Request ST9108 Physical Context Confirm Handover Command ET9108 Channel Activation ST9103 Channel Activation Acknowledge ET9103 Handover Command ST3103 Handover Access Handover Access Handover Access ST3106 Handover Detection Handover Access ST200 ET200 SABM Unnumbered Acknowledge Handover Complete ET3106 Establish Indication Handover Complete RF Channel Release ET3103 Handover Performed ST_RCR_ACK RF Channel Release Acknowledge ET_RCR_ACK 8
  • 9. Procedure & Timer Internal Handover (Inter Cell  Asynchronous) MS BTSServing BTSTarget BSC MSC Measurement Report Measurement Result Channel Activation ST9103 Channel Activation Acknowledge Handover Command ET9103 ST3103 Handover Command Handover Access Handover Access Handover Access ST3214 Handover Access Handover Detection Physical Information ET3214 ST3105 SABM ST200 ET3105 Establish Indication Unnumbered Acknowledge ET200 Handover Complete Handover Complete ET3103 Handover Performed Physical Context Request ST9108 Physical Context Confirm ET9108 RF Channel Release ST_RCR_ACK RF Channel Release Acknowledge ET_RCR_ACK External Handover (Inter Cell  Synchronous) MS BTSServing Measurement Report BTSTarget BSCServing Measurement Result ST7 Channel Activation BSCTarget Handover Required Channel Activation Acknowledge Handover Command Handover Command ST3124 ET3124 ST200 ET200 Handover Access Handover Access Handover Access Handover Access Physical Information ET7 ST8 MSC Handover Request ST9103 ET9103 HO Request ACK. Handover Command ST3106 SABM Unnumbered Acknowledge HO DETECTION HO DETECTION ET3106 Establish Indication SCCP Connect Required Handover Complete SCCP Connect Confirm Handover Complete RF Channel Release RF Channel Release Acknowledge ET8 Handover Complete Clear Command Clear Complete SCCP Release SCCP Release Complete 9
  • 10. Procedure & Timer External Handover (Inter Cell  MSC Handover Failure) MS BTSServing Measurement Report BTSTarget BSCTarget Measurement Result Measurement Report Measurement Result Measurement Report BSCServing MSC Handover Required ST7 ET7 Handover Required Reject ST HO_Req_Rej Measurement Result Measurement Report ET HO_Req_Rej Measurement Result Handover Required External Handover (Inter Cell  MS Handover Failure) MS BTSServing Handover Command BTSTarget BSCServing Handover Command BSCTarget MSC Handover Command ST8 SABM Establish Indication UA Handover Failure Handover Failure ET8 Handover Failure Link Release (MS Release) MS ST3110 BTS Channel Release Disconnect (FACCH) ET3110 Unnumbered Acknowledge BSC Channel Release (DCCH) Deactivation SACCH Release Indication Physical Context Request Physical Context Confirm RF Channel Release RF Channel Release ACK. MSC ST3109 ET3109 ST3111 ET3111 Expire ST9108 ET9108 BSC Initiated Channel Release towards the MS ST_RCR_ACK ET_RCR_ACK 10
  • 11. Procedure & Timer Link Release (A Interface Release) BSC ST9104 ET9104 BSC Initiated Normal Call Release towards the MSC ST9101 ET9101 MSC Clear Request Clear Command Clear Complete SCCP Release SCCP Release Complete Clear Command Clear Complete MSC Initiated Normal Call Release towards the BSC SCCP Release ST9101 ET9101 SCCP Release Complete 11
  • 12. Procedure & Timer T200_D Position BTS T200_D for SDCCH SAPI 0 Start Sending I-Frame Stop Receiving Acknowledgement Value Default 220 ms Max. Min. Step Action on expire Retransmission of I-Frame T200_SD Position BTS T200_SD for SACCH/SDCCH SAPI 0 Start Sending I-Frame Stop Receiving Acknowledgement Value Default 900 ms Max. Min. Step Action on expire Retransmission of I-Frame T200_ST Position BTS T200_ST for FACCH/HR SAPI 0 Start Sending I-Frame Stop Receiving Acknowledgement Value Default 155 ms Max. Min. Step Action on expire Retransmission of I-Frame T200_TF Position BTS T200_TF for FACCH/FR SAPI 0 Start Sending I-Frame Stop Receiving Acknowledgement Value Default 200 ms Max. Min. Step Action on expire Retransmission of I-Frame T200_D3 Position BTS T200_D3 for SDCCH SAPI 3 Start Sending I-Frame Stop Receiving Acknowledgement Value Default 450 ms Max. Min. Step Action on expire Retransmission of I-Frame T200_S3 Position BTS T200_S3 for SACCH/TCH SAPI 3 Start Sending I-Frame Stop Receiving Acknowledgement Value Default 1420 ms Max. Min. Step Action on expire Retransmission of I-Frame T200 Position BSC Supervision of Acknowledge of L2 I-Frame Start Sending of I-Frame Stop Reception of RR, RNR, REJ or I-Frame Value Default 300 ms Max. Min. Step Action on expire Retransmission (number of retries given by N200 parameter) T200 Position BTS Supervision of Acknowledge of L2 I-Frame Start Sending of I-Frame Stop Reception of RR, RNR, REJ or I-Frame Value Default 260 ms Max. 335.2 ms Min. 83.8 ms Step 83.8 ms Action on expire Retransmission (number of retries given by N200 parameter) T203 Position BSC/BTS Link Supervision Timer Start Reception of LAPD Frame Stop Reception of LAPD Frame Value Default 4 s Max. Min. Step Action on expire Link Recover Proceed Start T_Delay Position BSC Delay re-establishment LAPD link by BSC in order FU reset finish Start LAPD Link Failure Stop None Value Default 10 s Max. Min. Step Action on expire Re-establish LAPD Link T_Reset_Counter Position BTS Start Reset of Counters Stop None Reset LAPD error counter 12
  • 13. Procedure & Timer Value Default 30 s Max. 300 s Min. 1 s Step Action on expire Reset Counters BCCH_CUT_Timer Position BTS Timeout for cut BCCH on loss LAPD connection Start Loss LAPD connection Stop Re-establish of LAPD connection Value Default 210 s Max. 65535 s Min. 1 s Step Action on expire Cut BCCH T1_short Position BSC Supervision blocking/unblocking procedure Start Sending of BLOCK or UNBLOCK Stop Reception of BLOCK or UNBLOCK Acknowledge Value Default 16 s Max. 25.5 s Min. 10 s Step 0.1 s Action on expire The message send once more T1_long Position BSC Hold off time before attempting another blocking/unblocking procedure Start Second T1_short expire Stop Reception of BLOCK or UNBLOCK Acknowledge Value Default 60 s Max. 60 s Min. T1_short Step Action on expire Sending BLOCK/UNBLOCK, start T1_short T4 Position BSC Supervision of sending RESET to MSC Start Sending RESET to MSC Stop Reception of RESET ACK. or RESET from MSC Value Default 3 s Max. 6553.5 s Min. 2 s Step 0.1 s Action on expire The complete reset procedure repeated depending on parameter T5 (T17) Position BSC Overload procedure Start Reception of OVERLOAD from MSC or detection of a BSC overload Stop None Value Default 30 s Max. HFFFF Min. 0 Step Action on expire New OVERLOAD msg. or internal overload-ind are not ignore any more T6 (T18) Position BSC Overload procedure Start Reception of OVERLOAD from MSC or detection of a BSC overload Stop None Value Default 50 s Max. HFFFF Min. 0 Step Action on expire Traffic increased to next level T7 Position BSC During BSC will not re-present cells that were rejected by MSC Start A handover alarm was detected and the HND_REQ was sent to MSC Stop Reception HND_CMD or HND_REQ_REJ from MSC Value Default 5 s Max. 20 s Min. 0 Step 0.1 s Action on expire The BSC may report target cell, previously reported, again in an external HO T8 Position BSC Handover supervision in the (serving) BSC Start Sending of HND_CMD to MS or reception of REL_REQ from BTS Stop Reception of CLR_CMD from MSC or reception of HND_FAILURE from MS Value Default 14 s Max. 25.5 s Min. 0 Step 0.1 s Action on expire CLR_REQ sent to MSC, CHN_REL sent to MS, RF_CHN_REL sent to BTS T11 Position BSC Only use to TCH connection Start An ASSIGNMENT_REQ is stored in a queue Stop The queued ASSIGNMENT_REQ is served or deleted because of a new higher priority REQ Value Default 15 s Max. 255 s Min. 0 Step 1 s Action on expire Remove the request from queue and send CLR_REQ to MSC 13
  • 14. Procedure & Timer T13 Position BSC Reset guard period Start Reception of RESET from MSC Stop SSP/SPI received from SCCP or another RESET from MSC Value Default 15 s Max. HFFFF Min. 0 Step Action on expire Send RESET ACK. to MSC T3101 Position BSC/BTS Supervision of Immediately Assignment Procedure Start Sending IMMDIATELY_ASSIGN_CMD to the BTS Stop Reception of ESTABLSH INDICATION from BTS Value Default 3 s Max. 25.5 s Min. 0 Step 0.1 s Action on expire RF CHANNEL RELEASE send to BTS T3103 Position BSC/MSC Supervision of internal intracell HO and internal DR Procedure Start Sending of HO_CMD to MS (via BTS) Stop Reception of HO_CMPL from MS on new Channel or HO_FAILURE on old channel Value Default 16.5 s Max. 25.5 s Min. 0 Step 0.1 s Action on expire The old channel released by sending CLR_REQ to MSC T3105_D Position BTS Reception of PHY_INF. in the asyncr. HO performed on SDCCH Start Sending PHYSICAL INFORMATION to MS on SDCCH Stop Reception of SABM from MS on SDCCH or a correct L2 signalling (SDCCH/SACCH) Value Default 220 ms Max. 220 ms Min. 200 ms Step Action on expire BTS send CONN_FAIL indication, BSC send HO_FAIL T3105_F Position BTS Repetition PHY_INF. in the asyncr. HO performed on FACCH Start Sending of PHYSICAL INFORMATION to MS on FACCH Stop Reception of SABM from MS on FACCH or a correct L2 signalling or correct TCH frame Value Default 150 ms Max. 250 ms Min. 20 ms Step Action on expire BTS send CONN_FAIL indication, BSC send HO_FAIL T3106_D Position BTS Supervision of reception SABM from MS on SDCCH Start Reception of HO_ACCESS from MS on SDCCH Stop Reception of SABM from MS on SDCCH or a correct L2 signalling (SDCCH/SACCH) Value Default 1180 ms Max. 1500 ms Min. 500 ms Step Action on expire BTS send CONN_FAIL indication, BSC send HO_FAIL T3106_F Position BTS Supervision of reception SABM from MS on FACCH Start Reception of HO_ACCESS from MS on FACCH Stop Reception of SABM from MS on FACCH or a correct L2 signalling or correct TCH frame Value Default 800 ms Max. 1000 ms Min. 500 ms Step Action on expire BTS send CONN_FAIL indication, BSC send HO_FAIL T3107 (T10) Position BSC Supervision of Assignment Procedure and internal intracell HO Start Sending of ASSIGNMENT COMMAND to MS via BTS Reception of ASSIGN_COMP or ASSIGN_FAIL from MS or reestablishment of MS to old Stop channel (Not Phase 1) Value Default 14 s Max. 25.5 s Min. 0 Step Action on expire The old and new channel released. All connection to the MS are cleared T3109 Position BSC/BTS Supervision of channel release procedure Start Sending of CHANNEL RELEASE to MS via BTS Stop Reception of REL_IND from BTS after BTS received DISC-frame from MS Value Default 12 s Max. 35 s Min. 0 Step 0.1 s Action on expire Send RF CHANNEL RELEASE to BTS 14
  • 15. Procedure & Timer T3111 Position BSC Delay of channel release on air interface Start Reception of REL_IND from BTS after BTS received DISC-frame from MS Stop None Value Default 0.5 s Max. 25.5 s Min. 0 Step 0.1 s Action on expire Send RF CHANNEL RELEASE to BTS T9101 Position BSC Supervision of call clearing procedure on A interface (SCCP_REL) Start Sending of CLEAR COMPLETE to MSC Stop Reception of SCCP RELEASED from MSC Value Default 10 s Max. HFFFF Min. 0 Step Action on expire Send SCCP RELEASE to MSC T9103 Position BSC Supervision of channel activation procedure Start Sending of CHANNEL ACTIVATION to BTS Stop Reception of CHN_ACT_ACK or CHN_ACT_NACK from BTS Value Default 3 s Max. HFFFF Min. 0 Step Action on expire NOTE 1 T9103 Position BSC Supervision of Mode Modify procedure Start Sending of MODE MODIFY to BTS Stop Reception of MODE MODIFY ACK. from BTS Value Default 3 s Max. HFFFF Min. 0 Step Action on expire NOTE 2 T9104 Position BSC Supervision of clear request from BSC Start Sending of CLEAR REQUEST to MSC Stop Reception of CLEAR COMMAND from MSC Value Default 2 s Max. 25.5 s Min. 0 Step Action on expire Repeat CLEAR REQUEST T9105 Position BSC Supervision of SCCP connection procedure Start Sending of SCCP CONNECTION REQUEST to MSC Stop Reception of SCCP CONNECTION COMFIRM or SCCP_CON_REF Value Default 31 s Max. HFFFF Min. 0 Step Action on expire Send CHANNEL RELEASE to MS via BTS T9108 Position BSC Supervision of Physical Context Request procedure Start Sending PHYSICAL CONTEXT REQUEST to BTS Stop Reception of PHYSICSL CONTEXT CONFIRM from BTS Value Default 3 s Max. HFFFF Min. 0 Step Action on expire Procedure continues using default value T9110 Position BSC Supervision of MSC response HO_FAIL and ASSIGN_FAIL Start Sending of HO_FAIL or ASSIGN_FAIL to MSC Stop Reception of CLEAR_CMD from MSC or new HO_REQ on same SCCP connect Value Default 10 s Max. HFFFF Min. 0 Step Action on expire Clear initiated towards MSC, if due to ASSIGN_FAIL for MS then reset circuit start T_9112 Position BSC Supervision of channel modification in MS Start Sending of CHANNEL MODE MODIFY to MS Stop Reception of CHANNEL MODE MODIFY ACKNOWLEDGE Value Default 15 s Max. HFFFF Min. 0 Step Action on expire Sending ASSIGNMENT FAILURE to MSC T9113 Position BSC Supervision of external HO procedure in the target BSC Start Sending HO_REQ_ACK to MSC after having received HO_REQ from MSC Stop Reception of HO COMPLETE from MS via BTS or CLEAR COMMAND from MSC Value Default 20 s Max. 25.5 s Min. 0 Step 0.1 s Action on expire Send CLEAR REQUEST to MSC 15
  • 16. Procedure & Timer MS_P_CON_ACK Position BSC(Mode A)/BTS(Mode B) Supervision of MS PC procedure Start Sending MS_PWR_CMD to MS with a new MS_TXPWR value Stop Received right MS_TXPWR_CONF value in L1header from MS or call released or MS lost Default 2.88 s Max. 29.76 s Value Min. 0 Step (3960ms) (31960ms) Action on expire PC procedure start immediately without waiting for MS_P_CON_INT timer expire BS_P_CON_ACK Position BSC Supervision of BS power control procedure Start Sending BS_PWR_CMD to BTS with a new BS_TXPWR value Stop Received right BS_TXPWR_CONF value in L1 header from BTS or call released or MS lost Default 2.88 (3960ms) Max. 29.76 (31960ms) Min. 0 Step s s Action on expire PC procedure start immediately without waiting for BS_P_CON_INT timer expire MS_P_CON_INT Position Note 3 Delay next PC procedure after previous procedure finish Start Stop previous PC comparison procedure Stop The call released or MS lost Default 1.92 s Max. 29.76 s Value Min. 0 Step (2960ms) (31960ms) Action on expire The next PC comparison procedure start BS_P_CON_INT Position Note 3 Delay next PC procedure after previous procedure finish Start Stop previous PC comparison procedure Stop The call released or MS lost Default 1.92 s Max. 29.76 s Value Min. 0 Step (2960ms) (31960ms) Action on expire The next PC comparison procedure start THOmin Position BTS (Mode A) Delay consecutive HO alarm inside BTS (Mode A) Start Stop previous HO threshold comparison procedure in BTS Stop The call released or MS lost Max. 29.76 s Value Min. 0 Step Default 4.8 s (5960ms) (31960ms) Action on expire The next HO threshold comparison start and next HO alarm allowed T_qho Position BSC Time allowed to queue a HO_REQ message Start A HANDOVER REQUEST message store in queue Stop The request is served or deleted because of new higher priority request Value Default 5 s Max. 255 s Min. 0 Step 1 s Action on expire Remove request from queue and send HO_FAIL to MSC T_i Position BSC Delay the reaction on reception of SPI/SSP Start SSP/SPI received from SCCP Stop SSP/SPI received from SCCP Value Default 0 Max. 3 s Min. 0 Step Action on expire The RESET procedure start T_RCR_ACK Position BSC Supervision RF CHANNEL RELEASE procedure Start Sending RF CHANNEL RELEASE to BTS Stop Received RF CHANNEL RELEASE ACK. from BTS Value Default 5 s Max. HFFFF Min. 0 Step Action on expire 1st expire: RF_CHN_REL repeat; 2nd expire: RF_CHN_REL abandoned T_BTS_EST_CNF Position BSC Supervision SAPI 3 EST_REQ/EST_CONF procedure Start EST_REQ for SAPI 3 is sent to BTS Stop EST_CNF for SAPI 3 received from BTS Value Default 4 s Max. HFFFF Min. 0 Step Action on expire SAPI"N"_REJ send to MSC and REL_REQUEST send to BTS T_BTS_RLS_CNF Position BSC Supervision SAPI 3 REL_REQ/REL_CONF procedure Start REL_REQ for SAPI 3 is sent to BTS Stop REL_CNF for SAPI 3 received from BTS Value 16
  • 17. Procedure & Timer Value Default 4 s Max. HFFFF Min. 0 Step Action on expire The message is repeated once. At 2nd expire a CLR_REQ send to MSC 17
  • 18. Procedure & Timer T_HO_REQD_LOST Position BSC Guard period for sending HO_REQD to MSC Start A HO alarm was detected and HO_REQD sent to MSC Stop Received HO_CMD or HO_REQD_REJ from MSC Value Default 30 s Max. 120 s Min. 6 s Step Action on expire An O&M alarm is sent T_1 Position BSC Overload procedure Start Starting of access class barring in BSC Stop None Value Default 30 s Max. HFFFF Min. 30 s Step Action on expire The next access classes can be barred T_2 Position BSC Overload procedure Start Starting of access class barring in BSC Stop None Value Default 50 s Max. HFFFF Min. 30 s Step Action on expire The next access classes are barred T_SUP Position BTS (FUCO) Overload detection in FU Start Detection of a FU-internal Overload_Indication (Counter C in FU is incremented) Stop None Value Default 1 s Max. 25.5 s Min. 0.1 s Step 0.1 s Action on expire The counter in FU is decrement T_LB_OV Position BSC Leaky bucket timer for overload procedure Start Reception of an OVERLOAD from a non BCCH-FU Stop None Value Default 10 s Max. 25.5 s Min. 0.1 s Step Action on expire The leaky bucket counter in BSC is decrement TS_TCUA Position BSC Inhibition of successive load reduction in TCU Start The load of TCU is reduced by one step Stop None Value Default 10 s Max. 50 s Min. 0 Step Action on expire The TCU load can be reduced to next step TL_TCUA Position BSC Load increased in TCU Start The load of TCU is increased by one step Stop None Value Default 20 s Max. 50 s Min. 0 Step Action on expire The TCU load is increased to next step T_COUNT_I Position BSC Leaky bucket timer for TCU overload Start A TCU overload is detected in BSC (the counter COUNT_I is incremented) Stop None Value Default 12 s Max. 50 s Min. 0 Step Action on expire The counter COUNT_I is decrement T_OVL_MSC Position BSC Guard time for sending of OVERLOAD message to MSC Start Sending OVERLOAD to MSC Stop None Value Default 20 s Max. 6553.5 s Min. 0.1 s Step 0.1 s Action on expire Sending of OVEROAD to MSC is allowed T12 (T19) Position BSC Supervision of RESET CIRCUIT procedure Start Sending RESET CIRCUIT to MSC Stop Reception RESET CIRCUIT ACK. from MSC Value Default 10 s Max. 25.5 s Min. 0.1 s Step Action on expire The RESET CIRCUIT sent again to MSC 18
  • 19. Procedure & Timer T_CFI_TR Position BTS (FUCO) Guard time for filtering of transcoder alarms Start Sending of ESTABLISH INDICATION to BSC Stop None Value Default 2 s Max. 5 s Min. 1 s Step Action on expire Sending of CONN_FAIL_IND with cause Remote Transcoder Failure become possible T_SYNC Position TRAU/BTS Detection of loss of sync. between BTS and transcoder for FR CHN Start Loss of frame sync. Stop See TRCU/BTS interface spec. Value Default 1/1 s Max. 1/63 s Min. 1/1 s Step Action on expire See TRCU/BTS interface spec. T_SYNCd Position TRAU/BTS Detection of loss sync. on DL from transcoder Start Loss of frame sync. to BTS for HR and EFRCHN Stop Frame sync. is again obtained Value Default 1/1 s Max. 1/63 s Min. 1/1 s Step Action on expire BTS sent CONN_FAIL_IND with cause "Remote Transcoder Failure" T_STNCu Position TRAU/BTS Detection of UL frame error for HR and EFR channel A TRAU frame indicating an UL Frame Error which no error on sync. pattern and control bits Start received 3 consecutive TRAU frames received without UL Frame Error, without errors on frame sync. Stop pattern and control bits Value Default 1/1 s Max. 1/63 s Min. 1/1 s Step Action on expire BTS sent CONN_FAIL_IND with cause "Remote Transcoder Failure" T_release Position TRAU Supervision of call release procedure and loss of sync. in TRAU(HR and Start Loss of frame sync. EFR Channel) Stop Frame sync. is again obtained Value Default 1 s Max. 1 s Min. 1 s Step Action on expire TRAU terminates the operation (goes idle) until a valid frame received again T_ta Position BTS Control frequency of updating the time alignment changes made for HR CHN Start TA compound request has been sent to TRAU by BTS Stop None Value Default 120 ms (240 ms) Max. 1000 ms Min. 60 ms (160 ms) Step 20 ms Action on expire If needed the BTS can send a new TA compound request to TRAU T_FILTER Position BSC Filter of HO alarm Start Detection of HO alarm Stop None Default 2.88 s Max. 29.76 s Value Min. 0 Step (3960ms) (31960ms) Action on expire Enable a new HO alarm detection T_ALG_CONF Position BTS Supervision of Power Control and HO algorithm configuration Start Reception of Pre-process Configuration in BTS Stop Reception of BS_POWER_CONTROL and MS_POWER_CONTROL in BTS Value Default Max. 30 s Min. 5 s Step Action on expire O&M alarm generate T_INTRF_L3 Position BTS Repetition time for sending RF RESOURCE INDICATION Start RF RESOURCE INDICATION transmitted to BSC Stop None Value Default 60 s Max. 65535 s Min. 10 s Step Action on expire A new RE_RESOURCE_IND can be sent to BSC and timer restart 19
  • 20. Procedure & Timer TRACING_PERIOD Position BTS In mode A RPOPREC_MEAS_RES to BSC Start PROPREC_MEAS_RES transmitted to BSC Stop None Value Default 63 SDCCH mf Max. 63 SDCCH mf Min. 0 Step Action on expire A new PREPROC_MEAS_RES can be sent to BSC and timer restart T_RECOVERY Position BSC Control of trace file transmission to OMC_R/LT on interface failure Start Failure on BSS-OMC_R/LT interface or disk full and failure presumed exist on Stop None BSS-OMC_R/LT interface Value Default 10 mn Max. 10 mn Min. 10 mn Step Action on expire Note 4 T_MS_CELL_REJ Position BSC Guard timer during MS failed HO to cells won't be used subsequent Start HO_FAILURE received from MS (and N_PREF_CELLS=1) Reception of CLR_CMD, RESET, RESET_CIRCUIT, CONN_FAIL_IND, SCCP_N_DISC, Stop ASSIGN_REQ Value Default 5 s Max. 20 s Min. 0 Step 0.1 s Action on expire The cell which MS failed HO to may again be used in HO attempts T_SDDCH_MEAS_REP Position BSC Clear SDCCH CHN which remain connected forever Start Whenever a SDCCH CHN is allocation in a cell either during an IMME_ASSIGN or channel Stop None change such as inter-cell HO into current cell Value Default 4 s Max. 255 s Min. 0 Step Action on expire Note 5 T(conn_est) Position BSC SCCP timer waiting for CONN_CONF Start Sending CONNECTION REQUEST to MSC Stop Reception CONN_CONF, CONN_REFUSED, ROUTING_FAIL from MSC Value Default 30 s Max. Min. Step Action on expire N-DISCONNECT INDICATION is sent to SCCP user T(ias) Position BSC Delay to send a message on a connection section Start Reception CONN_CONF from MSC, any message send on connection section(restart timer) Stop Sending of RELEASED to MSC, reception of RELEASED from MSC Value Default 450 s Max. Min. Step 6 s Action on expire An Inactivity Test (IT) is sent on connection section T(iar) Position BSC Waiting to receive a message on a connection section Start Reception CONN_CONF from MSC, any message send on connection section(restart timer) Stop Sending of RELEASED to MSC, reception of RELEASED from MSC Value Default 1002 s Max. Min. Step 6 s Action on expire Note 6 T(rel) Position BSC Waiting for RELEASE COMPLETE Start Sending RELEASED to MSC Stop Reception RELEASE COMPLETE from MSC Value Default 15 s Max. 15 s Min. 4 s Step 0.5 s Action on expire RELEASE message is sent to MSC and T(rel) is start again T(stat inf.) Position BSC Delay between requests for sub-system status information Start Sending SST message to MSC Stop Reception SSA message from MSC Value Default 30 s Max. 1200 s Min. 6 s Step 0.5 s Action on expire A new SST message is sent to MSC 20
  • 21. Procedure & Timer T303 Position MS Start CM SERVICE REQUEST sent Stop CALL_PROC or REL_COMP received Value Default 30 s Max. Min. Step Action on expire 1st expire clear the call; 2nd expire the timer is not restarted T305 Position MS Start DISCONNECT sent Stop RELEASE or DISCONNECT received Value Default 30 s Max. Min. Step Action on expire 1st expire RELEASE sent; 2nd expire timer is not restarted T308 Position MS Start RELEASE sent Stop RELEASE_COMPLETE or RELEASE received Value Default 30 s Max. Min. Step Action on expire 1st expire retransmission RELEASE, restart 308; 2nd expire call ref. release T310 Position MS Start CALL_PROC received Stop Alert, CONN, DISC or PROG received Value Default 30 s Max. Min. Step Action on expire 1st expire send DISCONNECT; 2nd expire timer is not restart T313 Position MS Start CONNECT sent Stop CONNECT_ACKNOWLEDGE received Value Default 30 s Max. Min. Step Action on expire 1st expire send DISC; 2nd expire timer is not restart T323 Position MS Start MODIFY sent Stop MODIFY_COMPLETE or MODIFY_REJECT received Value Default 30 s Max. Min. Step Action on expire 1st expire clear the call; 2nd expire timer is not restart T3210 Position MS Start LOCATION UPDATE REQUEST sent Stop LOC_UPD_ACC, LOC_UPD_REJ, AUTH_REJ, Lower layer failure Value Default 20 s Max. Min. Step Action on expire Start T3211 T3211 Position MS Start LOC_UPD_REJ with cause 17 network failure, Lower layer failure or RR connection released Stop Time out, request MM_CONN_EST, change LA after RR connection abort Value Default 15 s Max. Min. Step during LOC_UPDATING Action on expire Restart the Location Update Procedure T3213 Position MS Start Location Updating Failure Stop Change of BCCH parameter Value Default 4 s Max. Min. Step Action on expire New random attempt T3220 Position MS Start IMSI Detach Stop Release from RX-sublayer Value Default 5 s Max. Min. Step Action on expire Enter NULL or Idle, ATTEMPTING to UPDATE 21
  • 22. Procedure & Timer T3230 Position MS Start CM_SERVICE_REQ, CM_RESET_REQ Stop Ciphering Mode setting, CM_SERVICE_ACC, CM_SERVICE_REJ Value Default 15 s Max. Min. Step Action on expire Provide Release Indication T3240 Position MS Start Note 7 Stop Note 8 Value Default 10 s Max. Min. Step Action on expire Abort the RR connection T3250 Position BSC Start TMSI_REAL_CMD or LOC_UPD_ACC with new TMSI sent Stop TMSI_REAL_COMP receive Value Default 12 s Max. Min. Step Action on expire Optionally release RR connection T3255 Position BSC Start LOC_UPD_ACC sent with follow on proceed Stop CM SERVICE REQEST Value Default Max. Min. Step Action on expire Release RR connection or use for MS terminating call T3260 Position BSC Start AUTHENTICATION REQUEST sent Stop AUTHENTICATION RESPONSE received Value Default 12 s Max. Min. Step Action on expire Optional release RR connection T3270 Position BSC Start IDENTITY REQUEST sent Stop IDENTITY RESPONSE received Value Default 12 s Max. Min. Step Action on expire Optional release RR connection T3122 Position MS This timer is used during Random Access Start Receipt of IMMEDIATELY ASSIGNMENT REJECT Stop None Value Given by network in IMMEDIATELY ASSIGNENT REJECT message Action on expire T3124 Position MS Used in the seizure procedure during HO when two cell not synchronised Start Stop Value If channel type of channel allocated in HO_CMD is SDCCH(+SACCH) it is 675 ms; Action on expire otherwise it is320 ms. T3126 Position MS Start Note 9 Stop Receipt IMMEDIATE ASSIGNMENT or IMMEDIATE ASSIGNMENT EXTENDED Value Default Max. 5 s Min. T+2S slots of the MS's RACH Step Action on expire Immediately Assignment Procedure is aborted T3128 Position MS Start After MS has the UL investigation procedure and the UL is busy Stop Receipt of the first UPLINK FREE message Value Default 1 s Max. Min. Step Action on expire The uplink investigation procedure abort 22
  • 23. Procedure & Timer T3130 Position MS Start After sending the first CHN_REQ message during a VGCS uplink access procedure Stop Receipt of a VGCS ACCESS GRANT message Value Default 5 s Max. Min. Step Action on expire The uplink access procedure is aborted 23
  • 24. Procedure & Timer Note 1: Channel Activation Procedure Immediate assignment: Abandon procedure Assignment: Assignment Failure to MSC Intra-cell HO: Force inter-cell HO depending on EN_INTRA_CELL_REPEATED Inter-cell HO: Try a new int. HO if possible External HO: HO Failure to MSC In all cases the BSC attempts to release the resource in the BTS Note 2: Mode Modify Procedure Sending of ASSIGNMENT FAILURE to MSC Note 3: Position is in BSC (Mode B) or in BTS (Mode A) Note 4: BSC checks disk to see if any trace files are in Recovery Needed condition and should be reported to OMC_R/LT. If interface is OK files are sent, if not the timer is restarted. Note 5: If no MEASUREMENT RESULT message has been received during the timer period, the SDCCH channel is released locally within the BSC and if a SCCP connection exists, a release scenario is done towards the MSC. Note 6: 1> The connection release procedure is initiated on a temporary connection section. 2> An O&M function is alerted for a permanent connection section. Note 7: The MS receives a LOCATION UPDATING ACCEPT; The MS receives a LOCATION UPDATING REJECT; The MS sends a CM SERVICE ABORT; The MS has released or aborted all MM connection. Note 8: Receipt of a MM message; Receipt of a CM message that initiates establishment of a CM connection. Note 9: This timer is started either after sending the maximum allowed number of CHANNEL REQUEST message during an immediate assignment procedure or on receipt an IMMEDIATE ASSINGMENT REJECT message. 24
  • 25. Procedure & Timer In Release 5 there are some changes in procedure. LOCATION UPDATING (for phase 1 extended and phase 2/2+ MS) MS BTS BSC DATA REQUEST (CM ENQ) MSC Connect Confirm CM ENQ CM CHANGE DATA IND (CM CHG) CM UPDATE LOCATION UPDATING (for phase 1 MS) MS BTS Unnumbered Acknowledge BSC MSC Connect Required SACCH Inf. Modify DATA REQUEST (CM ENQ) Connect Confirm CM ENQ CM CHANGE DATA IND (CM CHG) CM UPDATE MSC initiated Classmark enquiry (phase 1 MS) MS BTS Unnumbered Acknowledge BSC MSC Connect Required SACCH Inf. Modify Connect Confirm DATA REQUEST (CM ENQ) CM Request CM ENQ RR Status DATA IND (RR Status) MSC initiated Classmark enquiry (phase 1 extended and phase 2/2+ MS) MS BTS Unnumbered Acknowledge BSC SACCH Inf. Modify MSC Connect Required Connect Confirm DATA REQUEST (CM ENQ) CM Request CM ENQ RR Status DATA IND (RR Status) CM UPDATE 25
  • 26. Procedure & Timer Location Updating with follow on call (phase 2/2+ MS only) MS BTS Unnumbered Acknowledge BSC MSC Connect Required SACCH Inf. Modify Connect Confirm LOC_UPD_ACC LOC_UPD_ACC LOC_UPD_ACC CM_SERVICE_REQUEST DATA IND CM_SERV_REQ (MS CM2) CM_SERV_REQ (MS CM 2) CM UPDATE Early sending of CLASSMARK CHANGE (phase 2/2+ MS) MS BTS Channel Request BSC MSC Channel Request Channel Activation Channel Activation Acknowledge Immediately Assignment Immediately Assignment SABM Unnumbered Acknowledge CM Change Establish Indication SACCH Inf. Modify DATA Indication (CM CHG) Connect Required Connect Confirm CM UPDATE 26

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