Random Access Procedure MAC PDU Structure for Wireless Latency Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink and downlink data and control information due to limited radio resources, leading to increased latency and reduced throughput.
Innovation Solution
A method for performing a random access procedure in a wireless communication system, where a user equipment (UE) transmits a random access preamble and a common control channel service data unit on a physical random access channel and physical uplink channel, respectively, and determines the presence of a MAC protocol data unit based on a MAC subheader indicator associated with a contention resolution identity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a random access preamble and CCCH SDU are transmitted separately on different channels, then channel resource utilization is improved, but transmission latency increases
Solution Approach 1:
The patent combines the random access preamble and CCCH SDU into a single transmission on the PUSCH channel. The MAC PDU structure includes both the contention resolution identity (from the preamble) and the CCCH SDU data in one unified message, eliminating the need for separate transmissions on PRACH and PUSCH channels. This merging reduces the number of transmission steps and associated latency while efficiently utilizing the PUSCH channel resources.
2Reliability
If the MAC PDU structure includes detailed indicators for each component, then transmission reliability is improved, but message complexity increases
Solution Approach 1:
The patent segments the MAC PDU into distinct components with clear delimiters: the contention resolution identity field, the MAC SDU indicator, and the CCCH SDU field. Each component has a defined structure and purpose, allowing the receiver to reliably identify and process each element. The MAC SDU indicator specifically signals whether a MAC SDU is present, providing reliable information without requiring complex overall message structures.
Solution Approach 2:
The patent extracts the essential information elements (contention resolution identity, presence indicator, and data) from the complex random access procedure and encapsulates them in a streamlined MAC PDU structure. By taking out only the necessary components and eliminating redundant information, the patent maintains transmission reliability while reducing message complexity compared to traditional separate channel transmissions.
Data Source
AI summary
In the present disclosure, a UE transmits a random access preamble (RAP) on a physical random access channel (PRACH) and a common control channel (CCCH) service data unit (SDU) on a physical uplink channel (PUSCH). The UE receives a medium access control (MAC) protocol data unit (PDU) based on transmitting the RAP and the CCCH SDU. The MAC PDU may include a MAC PDU associated with a contention resolution identity (CRID) in the MAC PDU. The UE determines whether a MAC SDU is present or not in the MAC PDU, based on the MAC SDU indicator associated with a CRID in the MAC PDU in a state in which the CRID matches the CCCH SDU.