Multi-TRP PUSCH Repetitions with Dynamic Precoder Signaling
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Solution Overview
Problem
The existing 5G NR system faces challenges in enhancing transmission reliability and flexibility for physical uplink shared channels (PUSCH) in multi-Transmission Reception Point (TRP) scenarios, particularly due to varying channel conditions and the need for clear indications of transmit parameters for PUSCH repetitions to different TRPs.
Innovation Solution
The solution involves extending the SRS resource set to include more than two resources, allowing for multiple TPMIs and SRIs/panel indications in a single DCI, and implementing fast panel switching for PUSCH repetitions to different TRPs, with enhanced signaling mechanisms to indicate appropriate precoders, beams, and panels for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SRS resources are configured for multi-TRP scenarios, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the SRS resource configuration by introducing a dedicated parameter 'numberOfSRS-Resources' that explicitly defines the number of SRS resources (1, 2, or 4) to be configured. This segmentation allows the system to divide the multi-TRP transmission into distinct resource sets, where each SRS resource corresponds to specific TRPs and PUSCH repetition groups, thereby improving transmission reliability through diversified resource allocation while managing device complexity through structured configuration.
Solution Approach 2:
The patent implements dynamic configuration of SRS resources based on network conditions and TRP requirements. The gNB can dynamically indicate which SRS resources to use for different PUSCH repetition groups through DCI signaling, allowing the system to adapt the number and configuration of SRS resources (1, 2, or 4) according to varying channel conditions and reliability requirements, thus improving transmission reliability while avoiding unnecessary device complexity when full multi-TRP operation is not needed.
2Adaptability or versatility
If fast panel switching is implemented for PUSCH repetitions, then adaptability to varying channel conditions is improved, but ease of operation deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SRS resources and their associated panel indications before PUSCH transmission. The UE is pre-configured with up to 4 SRS resources, each potentially associated with different panels and TRPs. When PUSCH repetition is scheduled, the DCI explicitly indicates which SRS resources to use, allowing the UE to switch panels in advance according to the predetermined configuration, thereby achieving fast adaptation to varying channel conditions while maintaining ease of operation through pre-planned resource allocation.
Solution Approach 2:
The patent introduces SRS resources as an intermediary between the UE and multiple TRPs for PUSCH repetition transmission. Instead of directly managing complex panel switching for each TRP, the system uses SRS resources as intermediaries that carry panel indications and channel quality information. The gNB configures SRS resources with specific panel associations, and the UE uses these pre-configured intermediaries to facilitate smooth panel switching across different TRPs, reducing operational complexity while maintaining adaptability.
3Manufacturing precision
If signaling mechanisms are enhanced to indicate precoders and beams, then manufacturing precision of transmission parameters is improved, but loss of information increases
Solution Approach 1:
The patent makes the SRS resource configuration universal by designing it to serve multiple functions simultaneously. The same SRS resource configuration framework supports both single-TRP and multi-TRP scenarios, and can accommodate 1, 2, or 4 SRS resources depending on the deployment. The SRS resources serve as both channel sounding references and panel indication carriers, providing precise transmit parameter indication (TPMI) while avoiding redundant signaling. This multi-functionality achieves high manufacturing precision of transmission parameters without proportionally increasing signaling overhead.
Solution Approach 2:
The patent optimizes signaling efficiency by dynamically changing the number of SRS resources configured based on the actual multi-TRP deployment scenario. The system can configure 1, 2, or 4 SRS resources depending on the number of TRPs and repetition groups needed, rather than always using the maximum configuration. This parameter change approach allows precise indication of precoders and beams when multi-TRP operation is required, while reducing signaling overhead when fewer TRPs are involved, achieving a balance between manufacturing precision and information loss.
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AI summary
A method and a User Equipment (UE) for multi-Transmission Reception Point (TRP) operations are provided. The method includes receiving Uplink (UL) Downlink Control Information (DCI) from a Base Station (BS), the UL DCI comprising a first Transmit Precoder Matrix Indication (TPMI) associated with the first TRP and a second TPMI associated with the second TRP; transmitting a first Physical Uplink Shared Channel (PUSCH) repetition to the first TRP according to the first TPMI; and transmitting a second PUSCH repetition to the second TRP according to the second TPMI.