PRACH Preamble Mapping to Valid PUSCH Occasions
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception, particularly in the configuration of physical uplink shared channel (PUSCH) demodulation reference signals and the mapping of preambles to PUSCH occasions, which affect the overall performance of random access procedures.
Innovation Solution
A method is introduced where user equipment (UE) transmits a physical random access channel (PRACH) preamble on valid occasions and maps consecutive PRACH preambles to specific PUSCH occasions, optimizing the use of resources by determining valid PUSCH occasions based on uplink and downlink symbols, and configuring the apparatus with processors to manage these operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PRACH preambles are mapped to multiple PUSCH occasions, then the random access procedure capacity is improved, but the resource allocation complexity increases
Solution Approach 1:
The patent divides the random access procedure into distinct segments: PRACH preamble transmission on valid occasions, mapping to specific PUSCH occasions, and separate handling of message A PUSCH demodulation reference signals. This segmentation allows each component to be managed independently, improving capacity while controlling complexity through structured organization of the random access process.
Solution Approach 2:
The patent implements dynamic mapping where PRACH preambles are flexibly assigned to PUSCH occasions based on validity conditions and system configuration. The mapping allows adaptive resource allocation where not all PUSCH occasions are necessarily used, enabling the system to dynamically adjust resource usage based on current conditions while maintaining high capacity.
2Productivity
If PUSCH occasions are configured for all PRACH preambles, then resource utilization is improved, but the overhead and complexity of managing invalid occasions increases
Solution Approach 1:
The patent extracts and identifies only the valid PUSCH occasions from the complete set of configured occasions. By separating valid from invalid occasions, the system configures resources only where needed, improving utilization while reducing overhead. The invalid occasions are explicitly excluded from the mapping process, eliminating the need to manage unnecessary resources.
Solution Approach 2:
The patent changes the parameter of PUSCH occasion validity by introducing validity conditions that determine which occasions are actively used. This parameter change allows the system to transition from a static all-or-nothing resource allocation to a dynamic selective allocation, improving efficiency by activating only the necessary resources while keeping the system simple through clear validity criteria.
Data Source
AI summary
The present disclosure relates to a method carried out by a user equipment in a wireless communication system and a device supporting same and, more particularly, to a method and a device supporting same, the method comprising the steps of: transmitting a physical random access channel (PRACH) preamble in at least one among a plurality of valid PRACH occasions in a PRACH slot; and in response to the PRACH preamble, obtaining information related to a random access response (RAR), wherein the PRACH preamble is included in a plurality of PRACH preambles related to the plurality of valid PRACH occasions, and on the basis that a plurality of consecutive PRACH preambles included in the plurality of PRACH preambles are mapped to a valid physical uplink shared channel (PUSCH) occasion, the plurality of PRACH preambles are mapped to first PUSCH occasions among a plurality of valid PUSCH occasions.