2-Step Random Access Preamble Determination via SSB Segmentation
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently determining preambles and random access channel (RACH) occasions for 2-step random access, which affects data rate and network performance.
Innovation Solution
A method and system that determine a random access preamble for 2-step random access based on information related to synchronization signal blocks (SSBs) and preambles per SSB, and select a PRACH occasion using a PRACH configuration index, enabling efficient communication in 5G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 2-step random access is implemented to support higher data rates, then productivity is improved, but device complexity increases due to the need to determine preambles and RACH occasions
Solution Approach 1:
The patent segments the random access procedure into distinct components: preamble determination based on SSB information, RACH occasion selection based on PRACH configuration index, and message transmission. This segmentation allows each component to be optimized independently while maintaining overall system performance for 2-step random access.
2Reliability
If random access parameters are determined based on multiple information elements (SSBs, preambles per SSB, PRACH configuration), then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring PRACH occasions and preambles based on SSB measurements before actual random access transmission. The terminal determines the PRACH configuration index and selects preambles in advance based on downlink signal quality, which improves reliability by ensuring resources are ready before needed while reducing real-time complexity.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides method and apparatus of determining preamble and RACH occasions for 2-step random access.