For ease of understanding the Call Flow Scenarios will be split into 6 parts.
1. Node B Initialisation
2. Cell “Camp-on” / Location Update
3. Circuit Switched Call set-up
The following steps need to be executed in order for a mo call to complete
- RRC Connection Setup
- Service Request
- Security Procedures (Identity / Authentication / Security mode)
- Call Setup Request
- Radio Link and RAB Configuration
- Call Connection
The following steps need to be executed in order for the mobile to tear-down the call.
- Initiate Call Release
- Initiate Iu Release Procedure
- Release Iu Connection to MSC for UE
- Release RRC Connection to UE
- Delete Radio Link Resources in UTRAN
- Delete Radio Link Resources in UTRAN
The following steps need to be executed in order for a mo call to complete.
- Establish an RRC connection to the UTRAN
- Establish an Iu connection to the CN
- Make an Attach Request
- Carry out Security Procedures
- Complete the Attach
- Request PDP context activation
- Set-up RAB’s for the connection
- Create GTP connections and activate PDP Context at the GGSN
- Data Transfer
The following steps need to be executed in order for a mo call tear down to complete.
- PDP Context Deactivate request from UE
- Radio Link Setup
- Iub Transport Bearer Setup
- DCH-FP Synchronization
- Connection Setup
- Attach Procedure
- Authentication and Security Procedures
- PDP Context Activation Procedure
- Radio Link and RAB Configuration
- Data Transfer
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