Non-Codebook PUSCH Transmission via TCI and SRS Segmentation
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Solution Overview
Problem
Current 5G NR systems face challenges in optimizing wireless communication for increasing radio access demands, particularly in providing efficient non-codebook based physical uplink shared channel (PUSCH) transmission, which is crucial for next-generation wireless communication systems.
Innovation Solution
A method for non-codebook based PUSCH transmission is introduced, where user equipment (UE) receives downlink control information including transmission configuration indication (TCI) for beam information and sounding reference signal (SRS) resource indication for precoding information, enabling PUSCH transmission without relying on codebooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If codebook-based PUSCH transmission is used, then transmission reliability is maintained, but transmission flexibility and adaptability are limited
Solution Approach 1:
The patent segments the transmission configuration into two independent parts: TCI states for beam management and SRS resources for precoding. This segmentation allows non-codebook-based transmission to achieve flexibility in beam selection while maintaining reliability through separate precoding information, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The patent introduces dynamic TCI state indication for PUSCH transmission, allowing the beam configuration to be dynamically adjusted based on channel conditions. This dynamic approach enables the system to adapt to changing radio access demands while maintaining transmission reliability through proper beam management.
2Adaptability or versatility
If non-codebook based PUSCH transmission is implemented, then transmission flexibility is improved, but system complexity increases
Solution Approach 1:
The patent makes the TCI field in DCI format 0_1 multi-functional by enabling it to indicate both beam information and precoding information for non-codebook-based PUSCH transmission. This universality reduces the need for separate signaling mechanisms, thereby reducing system complexity while maintaining transmission flexibility.
Solution Approach 2:
The patent uses SRS (Sounding Reference Signal) as an intermediary to convey precoding information. Instead of requiring complex direct precoding signaling, the SRS resources serve as a mediator that carries the necessary precoding information, simplifying the overall system architecture while enabling flexible non-codebook-based transmission.
3Productivity
If precise beam and precoding information is provided, then PUSCH transmission efficiency is improved, but downlink control information overhead increases
Solution Approach 1:
The patent merges the beam indication and precoding indication into a single TCI field within DCI format 0_1. By combining these two functions into one field, the patent provides precise beam and precoding information for efficient PUSCH transmission while avoiding the overhead of separate signaling mechanisms.
Data Source
AI summary
A method of performing a non-codebook based physical uplink shared channel (PUSCH) transmission by a user equipment (UE) is provided. The method includes receiving, from a base station (BS), first downlink control information (DCI) including a transmission configuration indication (TCI) field that indicates a source reference signal (RS) for providing transmission beam information to the UE, receiving, from the BS, second DCI including a sounding reference signal (SRS) resource indication (SRI) field that indicates an SRS resource in an SRS resource set with usage set to non-codebook (SRS-nCB) resource set for providing precoding information to the UE, and performing the non-codebook based PUSCH transmission according to the transmission beam information and the precoding information.