PUSCH Beam Determination via PUCCH Spatial Information
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Solution Overview
Problem
In 5G NR communication systems, terminal devices cannot determine the uplink beam for transmitting a Physical Uplink Shared Channel (PUSCH) without performing uplink beam management, leading to performance issues in PUSCH transmission.
Innovation Solution
The terminal device determines a spatial domain filter for PUSCH transmission based on the spatial domain filter used for Physical Uplink Control Channel (PUCCH), using downlink control information (DCI) without sounding reference signal resource indicator (SRI) information, and transmits the PUSCH according to this determined filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device does not perform uplink beam management before PUSCH transmission, then the transmission process is simplified, but the terminal cannot determine the sending beam for PUSCH
Solution Approach 1:
The patent introduces PUCCH spatial information as an intermediary to bridge the gap between simplified transmission process and beam determination capability. The PUCCH spatial information acts as a mediator that enables the terminal to determine the PUSCH sending beam without requiring complex uplink beam management procedures, thus resolving the contradiction between process simplicity and beam determination capability
Solution Approach 2:
The patent applies the copying principle by using PUCCH spatial information as a reference copy to determine PUSCH spatial information. Instead of performing complex beam management, the terminal copies the spatial characteristics from PUCCH to PUSCH, enabling beam determination without additional complexity in the uplink transmission process
2Reliability
If the terminal device determines PUSCH sending beam using PUCCH spatial information, then PUSCH transmission performance is improved, but the terminal needs to receive and process additional spatial information
Solution Approach 1:
The patent applies universality by making PUCCH spatial information serve multiple functions: it not only enables beam determination for PUSCH but also simplifies the overall transmission process. The same spatial information structure is used for both PUCCH and PUSCH, eliminating the need for separate beam management procedures and reducing processing complexity while maintaining transmission performance
Data Source
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AI summary
Provided in the embodiments of the present application are a physical uplink shared channel transmission method and a terminal device. With said method, when a terminal does not carry out uplink beam management before being scheduled to transmit a PUSCH and is thus unable to determine an uplink beam, a transmission beam for transmitting the PUSCH may be determined, and the PUSCH may thus be transmitted according to the determined beam, thereby improving the PUSCH transmission performance. The method comprises: a terminal device determines a transmission beam for transmitting a first PUSCH according to a beam used to receive a PDCCH, a beam used to transmit a PUSCH previously or a beam used to transmit a PUCCH; and the terminal device transmits the first PUSCH according to the determined beam.