name: SID
full_form: Size InDex
context: Figure 8.5.1.2-1: IAB UP TNL Address Update procedure: Successful Operation. The gNB-CU-CP initiates the procedure by sending the IAB UP TNL ADDRESS UPDATE message to the gNB-CU-UP. If the gNB-CU-UP succeeds to update the TNL Address(es), it replies to the gNB-CU-CP with the IAB UP TNL ADDRESS UPDATE ACKNOWLEDGE message. Upon reception of the IAB UP TNL ADDRESS UPDATE message, if the DL UP TNL Address to Update List IE is included therein, the gNB-CU-UP shall replace the old TNL Address(es) by the new TNL Address(es) for all the maintained DL F1-U GTP tunnels corresponding to the old TNL Address(es). If the UL UP TNL Address to Update List IE is contained in the IAB UP TNL ADDRESS UPDATE ACKNOWLEDGE message, the gNB-CU-CP shall consider the new TNL address(es) as replacement for the corresponding old TNL address(es).
description: The Size Index (SID) is a parameter used in the MAC header to identify the size of a set of consecutive MAC-d PDUs. It is configured by higher layers and is independent for each Queue ID. The SID field has a length of 3 bits.
explanation: Based on the context, SID is classified as a Parameter because it is described as a configurable value used to identify the size of MAC-d PDUs in the MAC header. It is not a protocol, network function, or interface, but rather a specific setting used within the MAC layer.
section_title: 9.2.2	MAC PDU: Parameters of the MAC header (HS-DSCH)
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