WCDMA setup

[magno22]

What is difference between RRC setup and RAB setup?

[usama0795]

Radio Access Bearer (RAB) contains a service connection between UE and Core Network; a subscriber in UMTS may have several RABs and these are combined into RRC across the air interface. Some addition information is given below:

Radio Resource Controller (RRC):

RRC is the overall controller of the Access Stratum, responsible for configuring all other layers in the Access Stratum and providing the control and signaling interface to the NAS layer.

• Broadcast of System Information
• RRC Connection Management
• Radio Bearer Management
• RRC Mobility Functions
• Paging and Notification Functions
• Routing of Higher Layer Messages
• Control of Ciphering and Integrity Protection
• Measurement Control and Reporting
• Power Control Functions

RRC manages radio resources, including allocation, deallocation, and configuration of Logical, Transport, and Physical Channels, measurement reporting, security procedures, and overall management of the Access Stratum. The RRC Connection Setup establishes SRBs (Signalling Radio Bearers) to carry dedicated signaling. This phase of the call establishment is identical for CS and PS calls (both MO and MT) and it is always composed by next three messages:
1. RRC Connection Request (RACH, in UL)
2. RRC Connection Setup (FACH, in DL)
3. RRC Connection Setup Complete (DCH, in UL)

Attachment 28684Attachment 28685

[kaizzer545]

Awesome answer !