RLC Services provided to upper layers

• Transparent data transfer Service:
• The following functions are needed to
support transparent data transfer:
– Segmentation and reassembly.
– Transfer of user data.
– SDU discard.
• Unacknowledged data transfer
Service:
• The following functions are needed to
support unacknowledged data transfer:
– Segmentation and reassembly.
– Concatenation.
– Padding.
– Transfer of user data.
– Ciphering.
– Sequence number check.
– SDU discard.

• Acknowledged data transfer Service:
• The following functions are needed to
support acknowledged data transfer:
– Segmentation and reassembly.
– Concatenation.
– Padding.
– Transfer of user data.
– Error correction.
– In-sequence delivery of upper layer
PDUs.
– Duplicate detection.
– Flow Control.
– Protocol error detection and recovery.
– Ciphering.
– SDU discard.
• Maintenance of QoS as defined by
upper layers.
• Notification of unrecoverable errors.