name: HC
full_form: Header Compression
context: There are two different MAC PDU formats for HS-DSCH. Depending on configuration by higher layers the format is either MAC-hs or MAC-ehs. The MAC PDU format is determined by upper layer signalling [7]. When MAC-hs is configured, a MAC PDU for HS-DSCH consists of one MAC-hs header and one or more MAC-hs SDUs where each MAC-hs SDU equals a MAC-d PDU. A maximum of one MAC-hs PDU can be transmitted in a TTI per UE. The MAC-hs header is of variable size. The MAC-hs SDUs in one TTI belongs to the same reordering queue. If the UE receives successive MAC-hs SDUs of the same size in the MAC-hs PDU, represented by multiple (SID, N) combinations, the UE behaviour is not specified. In 1.28 Mcps TDD multi-frequency HS-DSCH cell, TSN can be extended to 9bit as indicated by RRC signalling. When TSN is extended to 9bit, the 3 least significant bits are placed after the last MAC-hs SDU. Figure 9.1.4-1: MAC-hs PDU When MAC-ehs is configured, a MAC PDU for HS-DSCH consists of one MAC-ehs header and one or
description: Header Compression (HC) is a technology used in telecommunications to compress headers in data packets, reducing overhead and improving efficiency in data transmission. In the context of 3GPP specifications, HC protocols like ROHC (Robust Header Compression) are utilized to compress headers, with options for PDCP layer configuration to introduce or not introduce a PDCP header based on the specific requirements of the HC protocol being used.
explanation: The classification of HC as a Technology is based on its role in enhancing data transmission efficiency through header compression. The context highlights the integration of HC protocols within the 3GPP specifications, particularly focusing on how different protocols like ROHC interact with PDCP layer configurations.
section_title: 5.1.10.3	0-octet-CID
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