name: UDC
full_form: User Data Convergence
context: UDC header (1 byte) is added in UDC compression function followed by UDC data block. The UDC header contains the information about whether the current PDCP SDU is compressed by UDC protocol or not. Only the compressed packets are stored in the buffer. The UDC header also contains a reset bit to inform the decompressor that the compression buffer has been reset. The validation bits (checksum) of the compression buffer are also contained in UDC header. Checksum mechanism could be used to resolve miss-match (if any) between the compression and de-compression buffers. If both SDAP and UDC are configured for a DRB, the UDC header shall be located after the SDAP header. Figure 5.14.3-1 shows the location of the UDC header in a PDCP data PDU. Figure 5.14.3-1: Location of UDC header in a PDCP Data PDU
description: User Data Convergence (UDC) is a protocol used for compressing user data in the 5G network, specifically within the PDCP (Packet Data Convergence Protocol) layer. It aims to reduce the size of user data packets by applying compression techniques.
explanation: The context explicitly mentions UDC as a compression function that adds a header to the PDCP SDU, indicating its role in compressing user data. This aligns with the definition of a protocol in telecommunications, which involves rules for data transmission and formatting.
section_title: 5.14.3UDC header
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