Transform Precoding Configuration in Random Access Procedures
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring transform precoding for the physical uplink shared channel (PUSCH) in contention-free random access (CFRA) procedures, particularly in determining the appropriate transform precoding parameters for PUSCH in CFRA, which affects the efficiency and accuracy of random access processes.
Innovation Solution
The method involves obtaining and controlling transform precoding parameters for the PUSCH based on dedicated signaling, allowing for flexible signaling and reusing existing parameters to configure transform precoding for PUSCH in CFRA, ensuring accurate and efficient transform precoding for contention-free random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transform precoding parameters are configured for PUSCH in CFRA procedures, then the accuracy and efficiency of random access processes are improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent reuses existing transform precoding parameters configured for other PUSCH transmissions (such as msg3-transformPrecoder, transformPrecoder for PUSCH scheduled by DCI, and transformPrecoder for configured grant PUSCH) to configure transform precoding for CFRA PUSCH. This multi-functional approach allows the same parameters to serve multiple purposes, reducing signaling overhead and device complexity while maintaining accurate transform precoding configuration for CFRA procedures
Solution Approach 2:
The system enables self-configuration of transform precoding parameters for CFRA PUSCH by automatically selecting and applying parameters from existing configurations based on the random access type and scenario. The UE autonomously determines which parameter to use (msg3-transformPrecoder for two-step CFRA, or other parameters for four-step CFRA) without requiring additional dedicated signaling, thereby reducing complexity while ensuring accurate configuration
2Adaptability or versatility
If dedicated signaling is used to configure transform precoding parameters for CFRA PUSCH, then the adaptability and performance are improved, but the signaling overhead increases
Solution Approach 1:
The patent makes existing transform precoding parameters multi-functional by having them serve both their original purposes and the configuration of CFRA PUSCH transform precoding. For example, msg3-transformPrecoder is reused for two-step CFRA, and transformPrecoder parameters are reused for four-step CFRA, eliminating the need for dedicated signaling while maintaining full adaptability to different random access scenarios
Solution Approach 2:
Instead of adding new dedicated signaling parameters for CFRA transform precoding configuration, the patent inverts the approach by having the UE select from existing parameters based on the random access type. This reversal of the conventional approach (from adding new parameters to reusing existing ones) reduces signaling overhead while preserving adaptability through conditional parameter selection
Data Source
AI summary
A method and apparatus for transform precoding parameter in random access procedure. The method implemented at a terminal device comprises obtaining at least one transform precoding parameter to be used for a request message for a contention free random access (CFRA). The method further comprises transmitting, to a network node, the request message for the CFRA. The request message comprises a random access channel (RACH)preamble and a physical uplink shared channel (PUSCH). A transform precoding on the PUSCH of the request message is controlled based on the at least one transform precoding parameter.