PUSCH Transmission via CORESET QCL RS Information
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing signaling overhead, particularly in the transmission of physical uplink shared channels (PUSCH) scheduled by DCI format 0_0, which leads to ambiguity and increased signaling procedures.
Innovation Solution
The method involves transmitting the PUSCH based on spatial relation quasi-colocation (QCL) reference signal information of a predefined control resource set (CORESET), even when this information is not explicitly configured in the DCI, and using predetermined QCL RS information for HARQ-ACK transmission, thereby eliminating the need for additional signaling procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spatial relation RS information is explicitly configured in DCI for PUSCH transmission, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring spatial relation QCL RS information in the CORESET before PUSCH transmission. The UE uses this pre-configured information from the CORESET to determine the spatial relation for PUSCH transmission scheduled by DCI format 0_0, eliminating the need for explicit spatial relation RS information in the DCI itself. This resolves the contradiction by preparing the spatial relation information in advance through CORESET configuration.
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously determine spatial relation information for PUSCH transmission using the QCL RS information already configured in the CORESET. Instead of requiring explicit spatial relation RS information from the network in each DCI, the UE self-determines the appropriate spatial relation based on the pre-configured CORESET parameters, reducing signaling overhead while maintaining transmission reliability.
2Measurement precision
If separate uplink beam configuration is implemented for PUSCH, then beam precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the CORESET's QCL RS information serve multiple functions: it provides both downlink reference signal information and uplink spatial relation information for PUSCH transmission. This multi-functionality eliminates the need for separate uplink beam configuration procedures, reducing device complexity while maintaining beam precision through the inherited QCL relationships.
Solution Approach 2:
The patent merges the downlink QCL configuration and uplink spatial relation configuration into a single CORESET configuration. By combining these functions, the system avoids the complexity of managing separate beam configurations while maintaining the precision needed for both downlink reception and uplink transmission through the unified QCL RS information.
Data Source
AI summary
A method for transmitting a physical uplink shred channel (PUSCH) by a terminal in a wireless communication system according to an embodiment of the present specification comprises the steps of: receiving downlink control information (DCI) scheduling a physical uplink shared channel (PUSCH); and transmitting the physical uplink shared channel (PUSCH) on the basis of the DCI. The format of the DCI is DCI format 0_0. On the basis that spatial relation RS information for transmission of the physical uplink shared channel (PUSCH) is not configured, the physical uplink shared channel (PUSCH) is transmitted on the basis of spatial relation quasi-colocation (QCL) RS information of a predefined control resource set (CORESET).