Uplink Transmission Adaptation via Dynamic SRS Resource Selection
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing uplink transmission resources, especially in scenarios requiring dynamic switching between single-TRP and multi-TRP based PUSCH transmissions to optimize reliability and efficiency.
Innovation Solution
The implementation of mechanisms that allow User Equipment (UE) to dynamically switch between single-TRP and multi-TRP based PUSCH transmissions by utilizing specific fields in the DCI, such as SRI and TPMI fields, to determine the appropriate SRS resource sets and precoding information for PUSCH transmissions, enabling flexible resource allocation and adaptive transmission strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP based PUSCH transmission is used to improve reliability, then transmission reliability is improved, but device complexity and resource management complexity increase
Solution Approach 1:
The patent implements dynamic switching between single-TRP and multi-TRP transmission modes based on channel conditions and traffic requirements. The UE can adaptively select which SRS resource set (first or second) to apply for PUSCH transmission, enabling flexible adaptation to changing network conditions while maintaining reliability improvements from multi-TRP when needed.
Solution Approach 2:
The patent configures different SRS resource sets with distinct parameters (spatial filters, precoding, power control) optimized for specific TRP scenarios. The first SRS resource set is optimized for single-TRP transmission while the second is optimized for multi-TRP transmission, allowing localized optimization of transmission quality for each scenario without compromising overall system performance.
2Adaptability or versatility
If dynamic switching between single-TRP and multi-TRP transmission is implemented to improve adaptability, then adaptability is improved, but control signaling overhead increases
Solution Approach 1:
The patent designs the DCI format to serve multiple functions: it schedules PUSCH resources, indicates which SRS resource set to apply (single-TRP or multi-TRP mode), and provides power control adjustments. This multi-functionality reduces the need for separate control messages and minimizes overhead while maintaining high adaptability.
Solution Approach 2:
The patent combines the transmission mode indication (single-TRP vs. multi-TRP) with the existing DCI scheduling information. By merging the mode selection indication into the DCI format that already contains resource allocation and power control information, the patent avoids additional signaling overhead while achieving dynamic adaptability.
3Adaptability or versatility
If multiple SRS resource sets are configured to support dynamic switching, then transmission flexibility is improved, but configuration complexity increases
Solution Approach 1:
The patent divides the SRS resource configuration into separate resource sets (first SRS resource set for single-TRP, second SRS resource set for multi-TRP). Each set is independently configured with appropriate parameters, allowing modular management and reducing the complexity of configuring and managing multiple SRS resources for different transmission scenarios.
Data Source
AI summary
A user equipment (UE) and a method for uplink (UL) transmission are provided. The method includes receiving, from a base station (BS), a first Radio Resource Control (RRC) configuration that indicates a first Sounding Reference Signal (SRS) resource set and a second SRS resource set; receiving, from the BS, Downlink Control Information (DCI) comprising at least a specific field; and determining whether to apply both or only one of the first SRS resource set and the second SRS resource set during Physical Uplink Shared Channel (PUSCH) transmission according to the specific field.