Fixed-Size MAC SDU Header for 5G Random Access Resource Efficiency

The message space is segmented into discrete size groups (first group, second group, etc.), where each group corresponds to a specific grant size. This segmentation allows the system to allocate resources efficiently by matching grant sizes to actual message requirements, avoiding the waste associated with variable-sized allocations while maintaining adequate flexibility through the grouped structure.

The patent changes the parameter representation from continuous (variable length indicator) to discrete (size group indexing). By introducing size group indicators that map to predetermined grant sizes, the system transforms the message sizing from a continuous variable to a discrete parameter, enabling more efficient resource allocation and reducing grant wastage.

Instead of allocating full grant sizes for all possible message variations, the patent uses partial action by allocating grant sizes that are sufficient for each size group but not excessively large. The grant size is tailored to match the actual message requirements within each group, avoiding the waste that would occur with uniform large grants while ensuring reliable transmission.

The patent transforms the grant size parameter from a continuous variable to a discrete set of predetermined values associated with size groups. This parameter change enables the system to select the minimum necessary grant size for each message type, ensuring reliable transmission without allocating excessive resources.

The patent introduces dynamic adaptability through multiple size groups, allowing the system to adjust grant sizes based on actual message requirements. This dynamic structure enables efficient resource usage for small messages while providing the capability to allocate larger grants when needed for coverage extension, thus balancing resource efficiency with coverage requirements.

The size group structure serves multiple functions: it enables efficient resource allocation for typical small messages while simultaneously providing the capability to allocate larger grants for coverage extension scenarios. This multi-functionality allows the same framework to address both resource efficiency and coverage requirements.

The patent applies local quality by providing detailed length information only where necessary (in the size group indicator) rather than including comprehensive length fields throughout the message structure. This selective approach maintains sufficient measurement precision for resource allocation while avoiding the complexity of detailed length indicators in every header.

The patent extracts the length indication function from traditional detailed length fields and consolidates it into a compact size group indicator. This extraction removes the complexity of detailed length specification while retaining the essential information needed for grant size determination, thereby reducing header complexity.