name: LI
full_form: Layer Indicator
context: 7.2.2.13.1 Definition The RLC segments and concatenates SDUs into UMD PDUs according to the PDU size requested by MAC. "Length Indicators" are added to allow correct reconstruction of SDUs. A special LI is defined to indicate that the start of on SDU is coincident with the start of the PDU. The special LI is needed to avoid discarding of an SDU when the first received PDU has a sequence number different from zero. Incorrect operation of segmentation, concatenation, or coding of "Length Indicators" will result in failure of the UE to communicate. 7.2.2.13.2 Conformance requirement "Length Indicators" = 111111111111100, UMD PDU: The first data octet in this RLC PDU is the first octet of a RLC SDU. Reference(s) TS 25.322 clause 9.2.2.8. 7.2.2.13.3 Test purpose To test that a UE in unacknowledged mode correctly handles a received RLC PDU with a 15-bit "Length Indicator" having its value equal to the special LI value 111111111111100 when the sequence number of the first received PDU is
description: The Layer Indicator (LI) is a parameter used in the Radio Link Control (RLC) protocol to indicate the length of a Service Data Unit (SDU) and to allow correct reconstruction of SDUs. It is a critical attribute for the operation of segmentation, concatenation, and coding of RLC PDUs.
explanation: The context explicitly mentions that LI is used to indicate the start of an SDU and to avoid discarding of an SDU when the first received PDU has a sequence number different from zero. This highlights its role as a parameter in controlling the operation of RLC, thus classifying it under the 'Parameter' entity type.
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