name: SAP
full_form: Service Access Point
context: The maximum delay from receiving an RLC or PDCP SDU in a downlink SAP until returning an SDU in the correspondent uplink SAP shall be within the delay requirement specified in subclause 5.3.2.9.1. The UE test loop function, operating in UE test loop mode 1, shall for every radio bearer with a closed test loop be able to return at least 4 SDUs within the time equal to the TTI of the actual radio bearer. NOTE: To enable testing of the Conversational CS TM reference radio bearer combinations as specified in 34.108 subclause 6.10 a UE must be able to loop back 4 SDUs per TTI. E.g. for "Conversational / unknown / UL:64 DL:64 kbps / CS RAB" operated in TM RLC mode 4 SDUs are needed to fill the transport format existing of 4x640 bits. NOTE: The loopback delay requirement in 5.3.2.9.2 does not impose any synchronisation mechanisms between the uplink RLC entity and the UE test loop function. Thus it could happen that a UE when having received 4 SDUs within one and the same TTI may deliver the
description: A Service Access Point (SAP) is an interface between two protocol layers in a telecommunications network, enabling communication and data exchange. In this context, SAP refers to the point of interaction between the Radio Link Control (RLC) or Packet Data Convergence Protocol (PDCP) and the UE test loop function.
explanation: The classification as Interface is justified by the description of SAP in the provided context, highlighting its role as a communication pathway between different protocol layers within the network.
section_title: 5.3.2.9.2Loopback delay requirement for RLC and PDCP SDUs (UE Test loop mode 1)
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