Section: 5.7.7.3 PDU Set Error Rate
Content: The PDU Set Error Rate (PSER) defines an upper bound for the rate of PDU Sets that have been processed by the sender of a link layer protocol (e.g. RLC in RAN of a 3GPP access) but that are not successfully delivered by the corresponding receiver to the upper layer (e.g. PDCP in RAN of a 3GPP access). Thus, the PSER defines an upper bound for a rate of non-congestion related PDU Set losses. The purpose of the PSER is to allow for appropriate link layer protocol configurations (e.g. RLC and HARQ in RAN of a 3GPP access). NOTE 1: In this Release, a PDU Set is considered as successfully delivered only when all PDUs of a PDU Set are delivered successfully. NOTE 2: How RAN enforces PSER is up to RAN implementation. A QoS Flow is associated with at most one PDU Set Error Rate value per direction. PSER is an optional parameter. If the PSER is available, the PSER supersedes the PER.