name: PPPR
full_form: ProSe per-packet reliability
context: BWPs are defined for the sidelink in a similar way as for UL/DL, to provide a convenient way to specify aspects relating to a UEs RF hardware chain implementation. A UE is configured with one active sidelink BWP when in connected mode to a gNB, which is the same as the single sidelink BWP used for idle mode or out-of-coverage operation. The subcarrier spacing used on sidelink is provided in the sidelink BWP (pre-)configuration, from the same set of values and associations to frequency ranges as for the Uu interface (i.e. 15, 30, or 60 kHz for FR1; and 60 or 120 kHz for FR2). Sidelink transmission and reception for a UE are thus contained within a sidelink BWP, and the same sidelink BWP is used for both transmitting and receiving. This means that resource pools, S-SSB, etc. must also be contained within an appropriate sidelink BWP from the UE's perspective.
description: ProSe per-packet reliability (PPPR) is a parameter that determines the reliability of sidelink packets based on the QoS requirements of the message. It allows for the management of reliability and is indicated dynamically in the Sidelink Control Information (SCI) which schedules the Physical Sidelink Shared Channel (PSSCH) for the packet.
explanation: The context describes PPPR as a factor that influences the reliability of sidelink packets, directly tied to QoS requirements. Its dynamic indication within SCI and its role in scheduling PSSCH placement firmly establish it as a parameter used to control and adjust transmission characteristics.
section_title: 5.3	Sidelink congestion control
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