Multi-TRP PUSCH Scheduling Using TRP-Specific SRS Indication
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Solution Overview
Problem
Current 3GPP standards do not address the configuration and activation of multiple SRS resources corresponding to multiple TRPs in a multi-TRP operation, which affects the efficient utilization of multi-TRP systems in 5G NR networks.
Innovation Solution
Enhanced SRI indication is provided, where the gNB configures the UE with multiple SRS resource sets corresponding to multiple TRPs and transmits DCI to indicate which SRS resources should be selected for PUSCH transmissions, allowing for independent or joint encoding of SRIs and TPMIs based on codebook or nonCodebook use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SRS resource sets are configured for multiple TRPs, then the reliability and efficiency of PUSCH transmissions are improved, but the device complexity increases due to enhanced SRI indication mechanisms
Solution Approach 1:
The patent segments the SRS resource configuration into separate sets associated with different TRPs. Each SRS resource set contains resources for a specific TRP, allowing independent configuration and selection. This segmentation enables the UE to manage multiple TRPs systematically without overwhelming complexity in a single unified configuration.
Solution Approach 2:
The patent introduces a new dimension to SRI indication by associating SRS resources with TRP identifiers. Instead of a flat SRI space, the system now operates in a multi-dimensional space where SRI selection depends on both the TRP and the specific SRS resource within that TRP's resource set. This dimensional expansion allows precise TRP-specific resource selection while maintaining manageable complexity through structured organization.
2Adaptability or versatility
If DCI fields are enhanced to accommodate multiple TRP scenarios, then the adaptability of the system is improved, but the manufacturing precision requirements increase for signal processing
Solution Approach 1:
The patent designs DCI fields with multi-functionality to handle both single-TRP and multi-TRP scenarios using the same basic structure. The SRI field can indicate resources for one TRP or multiple TRPs depending on configuration, eliminating the need for separate DCI formats. This universal design improves adaptability while avoiding the precision overhead of multiple specialized processing paths.
Solution Approach 2:
The system dynamically adapts the interpretation of DCI fields based on higher-layer configurations and active TRP sets. The same DCI bit pattern can mean different things depending on the current operational context (single-TRP vs. multi-TRP mode). This dynamic interpretation allows the system to maintain high adaptability without requiring precise, rigid signal processing for every possible scenario.
3Productivity
If independent SRI indication for each TRP is implemented, then the productivity of PUSCH transmissions is improved, but the loss of information increases due to expanded DCI structure
Solution Approach 1:
The patent merges the TRP identification information with the SRI field itself rather than using separate fields. The SRI field simultaneously indicates both the selected SRS resource and the associated TRP by incorporating TRP indicators within the SRI encoding. This merging eliminates redundant TRP indication fields while maintaining independent SRI control for each TRP, thereby improving productivity without proportionally increasing information overhead.
Data Source
AI summary
A user equipment (UE) is configured to communicate with one or more transmission and reception points (TRPs). The UE receives a sounding reference signal (SRS) resource set configuration including a first resource set corresponding to a first transmission and reception point (TRP) and a second resource set corresponding to a second TRP, receives a downlink control information (DCI) transmission including an SRS resource indicator (SRI) indicating (i) which resource from the first resource set should be selected for a first physical uplink shared channel (PUSCH) transmission to a first TRP, and (ii) which resource from the second resource set should be selected for a second PUSCH transmission to a second TRP and transmits the first PUSCH transmission to the first TRP and the second PUSCH transmission to the second TRP.