name: IWU
full_form: Interworking Unit
context: The MAC header for SHCCH is as shown in figure 9.2.1.6-1. a) SHCCH mapped to RACH and USCH/FACH and DSCH: - TCTF has to be included. b) SHCCH mapped to RACH and USCH/FACH and DSCH, where SHCCH is the only channel. Figure 9.2.1.6-1: MAC PDU format for SHCCH 9.2.1.7 MAC Header for MCCH The MAC PDU format for MCCH is as shown in figure 9.2.1.7-1. a) If the MAC header for MCCH is not configured through the MAC control SAP: - there is no MAC header for MCCH. b) If the MAC header for MCCH is configured through the MAC control SAP: - TCTF field is included in the MAC header for MCCH. NOTE: If MCCH is not the only channel on the FACH, the MAC header shall be configured for the MCCH. Figure 9.2.1.7-1: MAC PDU format for MCCH 9.2.1.8 MAC Header for MTCH The TCTF field and MBMS-Id field are included in the MAC header for MTCH as shown in figure 9.2.1.8.1. Figure 9.2.1.8-1: MAC PDU format for MTCH 9.2.1.9 MAC Header for MSCH The MAC PDU format for MSCH is as shown in figure 9.2.1.9-1. a) If the
description: The Interworking Unit (IWU) is a network function that establishes connections between different network nodes, specifically between an ATM node and an IP node. It maps code points to IP addresses, extracts port numbers from served user-generated references (SUGR), and establishes UDP connections to complete ALCAP connection setup.
explanation: The IWU is classified as a Network Function because it facilitates communication between different network nodes, manages address mapping, and establishes connections. The text describes its role in the TNL control protocol, interaction with ATM and IP nodes, and responsibility for setting up UDP connections.
section_title: 6.10.2.2.1	Issue on TNL IWU control protocol
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