- This offers Radio Bearer service to higher layers
*-Support Segmentation
- Transport of users and signalling information
- works in TM, UM and AM (Transparent mode, un-acknowledged mode and acknowledged mode)
AM -> Error free, unique and in-order
Functions:
Segmenation and Assembly
Concatenation
Padding
Transfer of user data
error correction
in-sequence delivery
duplicate detection
flow-control
ciphering
suspend and resume
transparent mode
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