name: PSIHI
full_form: PDU-Set Integrated Handling Indication
context: When the PSIHI is set for a QoS flow, as soon as one PDU of a PDU set is known to be lost, the remaining PDUs of that PDU Set can be considered as no longer needed by the application and may be subject to discard operation at the transmitter to free up radio resources. NOTE 1: It cannot always be assumed that the remaining PDUs are not useful and can safely be discarded. Also, in case of Forward Error Correction (FEC), active discarding of PDUs when assuming that a large enough number of packets have already been transmitted for FEC to recover without the remaining PDUs is not recommended as it might trigger an increase of FEC packets. In uplink, the UE may be configured with PDU Set based discard operation for a specific DRB. When configured, the UE discards all packets in a PDU set when one PDU belonging to this PDU set is discarded due to discard timer expiry. The gNB may perform downlink PDU Set discarding based on implementation by taking at least PSDB, PSI, PSIHI parameters into
description: PSIHI (PDU-Set Integrated Handling Indication) is a parameter used in the context of Quality of Service (QoS) flows to indicate whether a PDU set can be discarded when one of its PDUs is lost. This parameter influences how the transmitter handles remaining PDUs in a PDU set, potentially freeing up radio resources by discarding them.
explanation: The provided text describes PSIHI as a parameter used within QoS flows to control the handling of PDU sets. Its function directly relates to managing network behavior and resource allocation, classifying it as a parameter.
section_title: 16.15.4.2.2Discard
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