SRS-Based Uplink TRP Selection Through Explicit DCI Indication
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Solution Overview
Problem
Existing wireless communication systems face challenges in flexibly adopting either single-TRP or multi-TRP uplink transmission schemes, leading to potential misidentification of transmission modes due to limited SRI fields in DCI.
Innovation Solution
Introduce a new indication field in DCI to explicitly or implicitly indicate whether the current uplink transmission employs a single-TRP or multi-TRP scheme, allowing flexible switching between these modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new indication field is introduced into DCI to explicitly indicate the SRS resource set for uplink transmission, then the flexibility and accuracy of selecting between single-TRP and multi-TRP transmission schemes is improved, but the complexity of the DCI structure and processing increases
Solution Approach 1:
The indication field is segmented into multiple bits that can independently indicate different SRS resource set configurations. This allows the system to selectively activate single-TRP or multi-TRP modes by setting specific bit patterns, providing flexible transmission scheme selection while maintaining a structured and manageable DCI format.
Solution Approach 2:
The indication field serves multiple functions: it can indicate single-TRP transmission, multi-TRP transmission, and different SRS resource set configurations within a unified field. This multi-functionality reduces the need for separate indication mechanisms for different transmission modes, thereby improving flexibility without proportionally increasing DCI complexity.
2Device complexity
If the SRI field in DCI is used to indicate both SRS resource selection and transmission mode, then the DCI structure remains compact, but misidentification of transmission modes may occur reducing reliability
Solution Approach 1:
An intermediary indication field is introduced that acts as a mediator between the SRI field and the transmission mode determination. This field provides explicit information about the intended transmission mode, resolving ambiguities that would otherwise exist when using only the SRI field. The intermediary field ensures reliable mode identification while keeping the overall DCI structure compact through efficient bit usage.
3Loss of information
If implicit indication methods are used to reduce DCI overhead, then the signaling efficiency is improved, but the precision and reliability of transmission mode indication deteriorates
Solution Approach 1:
The indication field uses local quality differentiation where specific bit patterns provide explicit indication for critical transmission mode information, while other bits can use implicit or compressed representations for less critical parameters. This ensures high precision for mode identification while maintaining overall signaling efficiency through selective compression of information.
Data Source
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AI summary
The present application provides a wireless communication method, a terminal device and a network device. The method is applied to a terminal device, wherein the terminal device is configured with two SRS resource sets. The method comprises: receiving DCI, which comprises first indication information; and performing single transmission receive point (TRP) uplink transmission or multi-TRP uplink repeated transmission according to the first indication information, wherein the first indication information indicates one of the two SRS resource sets, so as to indicate that single TRP uplink transmission is performed by means of an SRS resource in the one SRS resource set, or the first indication information indicates the two SRS resource sets, so as to indicate that multi-TRP uplink repeated transmission is performed by means of SRS resources in the two SRS resource sets, such that a single TRP uplink transmission scheme or a multi-TRP uplink repeated transmission scheme is flexibly used.