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Flowchart rl failure

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The document summarizes the process that occurs in a radio network controller (RNC) when radio link failure is detected between the RNC and a user equipment (UE). 1) If no RRC CELL UPDATE message is received from the UE, the RNC sends an Iu release request with a cause of "Radio Connection With UE Lost" to the packet services core network (PS-CN). 2) If the RNC receives multiple "out of sync" indicators from the base station, it starts timers T_RLFAILURE and T313. If the timers expire, the RNC releases radio bearers and sends an Iu release request with a cause of "Failure in Radio Interface Procedure" to

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no RRC:CELL UPDATE message is received from the UE -> the Iu release request with a cause value Radio Connection With UE Lost is sent to the PS-CN T_L1_Sync_ReEstab_W RRC_ConnRe- RRC: CELL Timer T_RLFAILURE ait timer started Next Next in RNC = 2s estabTmr timer UPDATE slide slide started expired received N_OUTSYNC_IND out of sync Timer indicators = 8 T_RLFAILURE T_L1_Sync_ReEs expires = 2s tab_Wait RRC_ConnRe-estabTmr Timer T313 timer expired -timer started: T315 + expires (T302*N302) NRT Timer T313 Radio Link If T315 > 0, the started Failure RT T315 value is waiting of RRC waiting of RRC out of sync out of sync RT checked connection re- connection re- indicators indicators NRT RNC receives establishment is establishment is RNC receives If T315 = 0, then NBAP:RADIO NBAP:RADIO initiated initiated Re- LINK FAILURE LINK FAILURE all NRT radio bearers (also the All the RT radio bearers are released and Iu message message (also the N313 amount of establishmen form BTS form BTS RT RB(s), if existing) RT RB(s), existing) release request with a out of sync When the criteria for radio link are released locally are released locally cause value Failure in failure timer T315 t are fulfilled. with a cause indicators value and the Iu release and the Iu release Radio Interface Cell value The timer is started only if radio Procedure is sent to the Reselection started bearer(s) that are associated with "Synchronizati on Failure" request with a cause request with a cause value Radio value Radio CS-CN Next on Failure" Next T315 exist. NRT radio bearers are Connection With UE Connection With UE slide slide associated with T315 Lost is sent to the Lost is T315 T302 running => PS CN(s) PS CN(s) expired continue to wait continue to wait T302 not response to cell response to cell update, according update, according running => to T302 to enter idle mode T314 value re- No re- The Iu release The Iu release is checked, establishme RT RBs T314 value is establishment request with a request T314 = 0s nt for RT release checked, T314 = for RT cause value cause value in d 0s in current Failure in Radio Failure in Radio current services=0 services in Interface Interface Soc Classification level locally release release current Procedure is Procedure is 1 息 Nokia Siemens Networks release sent to the CN, sent to the CN,

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Flowchart rl failure

  • 1. no RRC:CELL UPDATE message is received from the UE -> the Iu release request with a cause value Radio Connection With UE Lost is sent to the PS-CN T_L1_Sync_ReEstab_W RRC_ConnRe- RRC: CELL Timer T_RLFAILURE ait timer started Next Next in RNC = 2s estabTmr timer UPDATE slide slide started expired received N_OUTSYNC_IND out of sync Timer indicators = 8 T_RLFAILURE T_L1_Sync_ReEs expires = 2s tab_Wait RRC_ConnRe-estabTmr Timer T313 timer expired -timer started: T315 + expires (T302*N302) NRT Timer T313 Radio Link If T315 > 0, the started Failure RT T315 value is waiting of RRC waiting of RRC out of sync out of sync RT checked connection re- connection re- indicators indicators NRT RNC receives establishment is establishment is RNC receives If T315 = 0, then NBAP:RADIO NBAP:RADIO initiated initiated Re- LINK FAILURE LINK FAILURE all NRT radio bearers (also the All the RT radio bearers are released and Iu message message (also the N313 amount of establishmen form BTS form BTS RT RB(s), if existing) RT RB(s), existing) release request with a out of sync When the criteria for radio link are released locally are released locally cause value Failure in failure timer T315 t are fulfilled. with a cause indicators value and the Iu release and the Iu release Radio Interface Cell value The timer is started only if radio Procedure is sent to the Reselection started bearer(s) that are associated with "Synchronizati on Failure" request with a cause request with a cause value Radio value Radio CS-CN Next on Failure" Next T315 exist. NRT radio bearers are Connection With UE Connection With UE slide slide associated with T315 Lost is sent to the Lost is T315 T302 running => PS CN(s) PS CN(s) expired continue to wait continue to wait T302 not response to cell response to cell update, according update, according running => to T302 to enter idle mode T314 value re- No re- The Iu release The Iu release is checked, establishme RT RBs T314 value is establishment request with a request T314 = 0s nt for RT release checked, T314 = for RT cause value cause value in d 0s in current Failure in Radio Failure in Radio current services=0 services in Interface Interface Soc Classification level locally release release current Procedure is Procedure is 1 息 Nokia Siemens Networks release sent to the CN, sent to the CN,