Chapter2 Flow

  • Class 1 elementary procedures
    Class 1 elementary procedures are characterized by the fact that each request sent is positively or negatively acknowledged by an appropriate success or failure message.
  • Class 2 elementary procedures
    In contrast to the Class 1 message, the messages of Class 2 are unidirectional messages that are not explicitly acknowledged by the receiving entity.

S1AP Class 1 elementary procedures

Elementary procedure Initiating message Successful Response message Unsuccessful Response message
Handover Preparation HANDOVER REQUIRED HANDOVER COMMAND HANDOVER PREPARATION FAILURE
Handover Resource Allocation HANDOVER REQUEST HANDOVER REQUEST ACKNOWLEDGE HANDOVER FAILURE
Path switch Request PATH SWITCH REQUEST PATH SWITCH REQUEST ACKNOWLEDGE PATH SWITCH REQUEST FAILURE
Handover Cancellation HANDOVER CANCEL HANDOVER CANCEL ACKNOWLEDGE –
E-RAB Setup E-RAB SETUP REQUEST E-RAB SETUP RESPONSE –
E-RAB Modify E-RAB MODIFY REQUEST E-RAB MODIFY RESPONSE –
E-RAB Release E-RAB RELEASE COMMAND E-RAB RELEASE RESPONSE –
Initial Context Setup INITIAL CONTEXT SETUP REQUEST INITIAL CONTEXT SETUP RESPONSE INITIAL CONTEXT SETUP FAILURE
Reset RESET RESET ACKNOWLEDGE –
S1 SETUP S1 SETUP REQUEST S1 SETUP RESPONSE S1 SETUP FAILURE
UE Context Release UE CONTEXT RELEASE COMMAND UE CONTEXT RELEASE COMPLETE –
UE Context Modification UE CONTEXT MODIFICATION REQUEST UE CONTEXT MODIFICATION RESPONSE UE CONTEXT MODIFICATION FAILURE
eNB configuration update ENB CONFIGURATION UPDATE ENB UPDATE CONFIGURATION ACKNOWLEDGE ENB CONFIGURATION UPDATE FAILURE
MME Configuration Update MME CONFIGURATION UPDATE MME CONFIGURATION UPDATE ACKNOWLEDGE MME CONFIGURATION UPDATE FAILURE
Write-Replace Warning WRITE-REPLACE WARNING REQUEST WRITE-REPLACE WARNING RESPONSE –

S1AP Class 2 elementary procedures

Elementary procedure Message
Handover Notification HANDOVER NOTIFY
E-RAB Release Request E-RAB RELEASE REQUEST
Paging PAGING
Initial UE MEssage INITIAL UE MESSAGE
Downlink NAS TRansport DOWNLINK NAS TRANSPORT
Uplink NAS Transport UPLINK NAS TRANSPORT
NAS non delivery indication NAS NON DELIVERY INDICATION
Error Indication ERROR INDICATION
UE Context Release Request UE CONTEXT RELEASE REQUEST
Downlink S1 CDMA2000 Tunneling DOWNLINK S1 CDMA2000 TUNNELING
Uplink S1 CDMA2000 Tunneling UPLINK S1 CDMA2000 TUNNELING
UE Capability Info Indication UE CAPABILITY INFO INDICATION
eNB Status Transfer eNB STATUS TRANSFER
MME Status Transfer MME STATUS TRANSFER
Deactivate Trace DEACTIVATE TRACE
Trace Start TRACE START
Trace Failure Indication TRACE FAILURE INDICATION
Location Reporting Control LOCATION REPORTING CONTROL
Location Reporting Failure Indication LOCATION REPORTING FAILURE INDICATION
Location Report LOCATION REPORT
Overload Start OVERLOAD START
Overload Stop OVERLOAD STOP
eNB Direct Information Transfer eNB DIRECT INFORMATION TRANSFER
MME Direct Information Transfer MME DIRECT INFORMATION TRANSFER
ENB Configuration Transfer ENBConfigurationTransfer
MME Configuration Transfer MMEConfigurationTransfer

X2AP Class 1 elementary procedures

Elementary procedure Initiating message Successful Response message Unsuccessful Response message
Handover Preparation HANDOVER REQUIRED HANDOVER REQUEST ACKNOWLEDGE HANDOVER PREPARATION FAILURE
Reset RESET REQUEST RESET RESPONSE –
X2 SETUP X2 SETUP REQUEST X2 SETUP RESPONSE X2 SETUP FAILURE
eNB configuration update ENB CONFIGURATION UPDATE ENB UPDATE CONFIGURATION ACKNOWLEDGE ENB CONFIGURATION UPDATE FAILURE
Resource Status Reporting Update RESOURCE STATUS REQUEST RESOURCE STATUS RESPONSE RESOURCE STATUS FAILURE
Mobility Settings Change MOBILITY CHANGE REQUEST MOBILITY CHANGE ACKNOWLEDGE MOBILITY CHANGE FAILURE
Cell Activation CELL ACTIVATION REQUEST CELL ACTIVATION RESPONSE CELL ACTIVATION FAILURE

X2AP Class 2 elementary procedures

Elementary procedure Message
Load Indication LOAD INFORMATION
Handover Cancel HANDOVER CANCEL
SN Status Transfer SN STATUS TRANSFER
UE Context Release UE CONTEXT RELEASE
Resource Status Reporting RESOURCE STATUS UPDATE
Error Indication ERROR INDICATION
Radio Link Failure Indication RLF INDICATION
Handover Report HANDOVER REPORT

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