PRACH Preamble Repetition with Dropped ROs and Reference RA-RNTI
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Solution Overview
Problem
The existing wireless communication systems face challenges in handling collisions between random access channel occasions (RO) and other signals/channels during PRACH/MSGA preamble repetition transmission, and there is a need for a method to calculate RA-RNTI/MSGB-RNTI based on reference ROs.
Innovation Solution
A method and device for performing uplink transmission and reception in a wireless communication system that involves receiving configuration information for PRACH preamble repetition, dropping specific ROs colliding with other signals/channels, and calculating RA-RNTI based on remaining ROs, with options for reference RO selection through predefined, configured, or default methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH preamble repetition transmission is performed in multiple ROs, then transmission reliability is improved, but resource collision with other signals/channels increases
Solution Approach 1:
The patent segments the PRACH preamble repetition transmission across multiple Random Access Channel Occasions (ROs) rather than concentrating all repetitions in a single RO. This segmentation allows the system to distribute transmission attempts across different time-frequency resources, reducing the probability that all repetitions will collide with other signals or channels simultaneously, thereby maintaining transmission reliability while avoiding resource conflicts.
Solution Approach 2:
The patent introduces dynamic RO selection mechanisms where the UE can adaptively choose which ROs to use for preamble repetition based on real-time channel conditions, collision detection, and network configuration. This dynamic approach allows the system to avoid static resource allocations that are prone to collision, enabling flexible adaptation to varying traffic patterns and interference conditions while maintaining reliable transmission.
2Measurement precision
If RA-RNTI is calculated based on reference RO during preamble repetition, then identifier accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent establishes preliminary rules and configurations for determining reference ROs before the actual random access procedure begins. The network configures parameters such as roStartTime, roLength, and referenceRO-Index in advance, allowing the UE to pre-calculate or pre-determine which RO will serve as the reference for RA-RNTI calculation. This preliminary setup simplifies the actual calculation process during runtime while ensuring accurate identifier generation.
Solution Approach 2:
The patent employs simplified RA-RNTI calculation formulas that use only essential parameters from the reference RO (such as slot index, frequency index, and frame number) rather than requiring complex processing of all RO attributes. This approach creates a lightweight, disposable calculation method that achieves sufficient accuracy for random access identification without imposing heavy computational burdens on the UE.
Data Source
AI summary
Disclosed are a method and device for performing uplink transmission and reception in a wireless communication system. The method by which a terminal performs uplink transmission in a wireless communication system according to an embodiment disclosed herein comprises the steps of: receiving configuration information related to PRACH preamble repetitive transmission from a base station; and performing the PRACH preamble repetitive transmission in one or more ROs among a plurality of ROs on the basis of the configuration information, wherein, a specific RO among the plurality of ROs is dropped on the basis of that the specific RO conflicts with a specific signal or a specific channel, and an RA-RNTI can be calculated on the basis of one or more reference ROs selected from among the remaining ROs other than the specific RO among the plurality of ROs.