Multi-TRP Uplink Transmission via SRS Resource Segmentation
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Solution Overview
Problem
Current New Radio (NR) Release 15/16 technologies are limited to single Transmission and Reception Point (TRP) based PUSCH transmission, unsuitable for transmitting Physical Uplink Shared Channel (PUSCH) towards multiple TRPs, as they only allow a single Sounding Reference Signal (SRS) resource to be indicated for spatial relation definition.
Innovation Solution
The method involves indicating two or more SRS resources in either a single SRS resource set or different SRS resource sets within Downlink Control Information (DCI) to support simultaneous uplink PUSCH transmission to multiple TRPs, allowing different layers or PUSCHs to be transmitted to various TRPs using Spatial Division Multiplexing (SDM) or Frequency Division Multiplexing (FDM) schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single SRS resource is indicated for spatial relation definition, then the current NR Release 15/16 technology can be maintained with simple structure, but the system cannot transmit PUSCH towards multiple TRPs simultaneously
Solution Approach 1:
The patent segments the SRS resource indication by introducing multiple SRI fields in the DCI, where each SRI field corresponds to a specific TRP. This allows independent indication of SRS resources for different TRPs, enabling multi-TRP transmission while maintaining clear separation of functions in the control information structure.
Solution Approach 2:
The patent extends the traditional single SRS resource indication to multiple dimensions by adding spatial diversity through multiple TRPs. Each TRP is associated with its own SRS resource and SRI field, creating a multi-dimensional transmission architecture that supports simultaneous communication with multiple TRPs.
2Reliability
If multiple SRS resources are indicated in DCI for simultaneous multi-TRP transmission, then uplink data transmission reliability is improved through spatial diversity, but the DCI structure becomes more complex
Solution Approach 1:
The patent segments the reliability improvement by associating each TRP with its own dedicated SRS resource and SRI field. This segmentation allows independent optimization of transmission parameters for each TRP while maintaining manageable structure through clear separation of control elements.
Solution Approach 2:
The patent applies local quality by allowing different SRS resources to be indicated for different TRPs, where each TRP receives customized spatial relation information based on its specific channel conditions. This enables optimized transmission parameters tailored to each TRP's local characteristics.
3Area of stationary object
If multiple SRS resource sets are configured, then spatial diversity for coverage is improved, but the configuration and management overhead increases
Solution Approach 1:
The patent makes the SRS resource set configuration universal by allowing the same framework to serve multiple TRPs with different spatial characteristics. The unified approach to configuring and indicating SRS resources across multiple TRPs reduces overall system complexity compared to separate configurations for each TRP.
Solution Approach 2:
The patent segments the coverage enhancement by organizing TRPs into distinct groups with dedicated SRS resource sets. This segmentation allows targeted spatial diversity optimization for each TRP group while managing configuration overhead through structured organization of resources.
Data Source
AI summary
Systems and methods are disclosed herein that relate to multi-Transmission/Reception Point (TRP) uplink transmission in a cellular communications system. In one embodiment, a method performed by a wireless communication device comprises receiving, from a network node, a configuration of two Sounding Reference Signal (SRS) resource sets, a first and second SRS resource sets, each comprising one or more SRS resources. The method further comprises receiving, from the network node, downlink control information (DCI) that schedules a physical uplink channel transmission comprising a first part associated to a first SRS resource in the first SRS resource set and a second part associated to a second SRS resource in the second SRS resource set, wherein the first and second SRS resources are indicated in the DCI. The method further comprises transmitting the physical uplink channel transmission in accordance with the DCI.