name: PDCP
full_form: Packet Data Control Protocol
context: When the successful delivery of a PDCP SDU is confirmed by PDCP status report, the transmitting PDCP entity shall discard the PDCP SDU along with the corresponding PDCP Data PDU. When the discardTimer or discardTimerForLowImportance expires for a PDCP SDU, the transmitting PDCP entity shall: - if pdu-SetDiscard is configured: - discard all PDCP SDUs belonging to the PDU Set to which the PDCP SDU belongs along with the corresponding PDCP Data PDUs; NOTE 1: PDCP SDUs subsequently received from upper layers are also discarded if they belong to the PDU Set. - else: - discard the PDCP SDU along with the corresponding PDCP Data PDU. If the corresponding PDCP Data PDU has already been submitted to lower layers, the discard is indicated to lower layers. For SRBs, when upper layers request a PDCP SDU discard, the PDCP entity shall discard all stored PDCP SDUs and PDCP PDUs. NOTE 2: Discarding a PDCP SDU already associated with a PDCP SN causes a SN gap in the transmitted PDCP Data PDUs, which
description: The Packet Data Control Protocol (PDCP) is a protocol used in telecommunications to control and manage packet data transmission. It handles tasks such as header compression, encryption, and integrity protection for user plane data.
explanation: Based on the context provided, PDCP manages the delivery of SDUs (Service Data Units), handles discard timers, and interacts with upper and lower layers for data transmission and management. These functions clearly define it as a set of rules governing packet data control, aligning with the definition of a protocol.
section_title: 5.3SDU discard
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