SRS Resource Set Configurations for Uplink Cyclic Delay Diversity
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in efficiently supporting uplink transmissions with cyclic delay diversity due to the complexity of managing non-coherent and partially-coherent antenna ports, which affects channel determination and precoder selection, leading to reduced network performance and increased errors.
Innovation Solution
The implementation of a method where user equipment (UE) receives an indication of a sounding reference signal (SRS) resource set to signal a virtual port formed by combining non-coherent or partially-coherent antenna ports using precoding and cyclic delay diversity, allowing for accurate channel determination and improved channel state information (CSI) acquisition by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antenna ports are combined using precoding and cyclic delay diversity to form virtual ports, then channel determination accuracy is improved, but system complexity increases
Solution Approach 1:
The patent combines multiple non-coherent or partially-coherent antenna ports into virtual ports using precoding and cyclic delay diversity. This merging approach allows the system to treat multiple antenna ports as a single virtual port for channel determination purposes, improving accuracy while managing complexity through unified processing.
Solution Approach 2:
The patent introduces virtual ports as intermediary entities that mediate between physical antenna ports and channel determination. The virtual ports serve as a bridge, allowing the base station to accurately determine channels without directly managing the complexity of multiple coherent antenna ports, thus resolving the contradiction between accuracy and complexity.
2Reliability
If non-coherent and partially-coherent antenna ports are managed for uplink transmissions, then transmission reliability is improved, but channel state information acquisition becomes more difficult
Solution Approach 1:
The patent creates virtual port representations that copy the essential characteristics of multiple antenna ports. These virtual ports provide a simplified model that maintains reliability information while making channel state information acquisition easier, as the base station only needs to measure the virtual port rather than individually analyzing each antenna port.
Solution Approach 2:
The patent changes the parameters used for channel state information acquisition by transitioning from measuring individual antenna ports to measuring virtual ports. This parameter change simplifies the measurement process while preserving the reliability benefits of managing multiple antenna ports through precoding and cyclic delay diversity.
3Ease of operation
If virtual ports are used to simplify antenna port management, then ease of operation is improved, but measurement precision requirements increase
Solution Approach 1:
The patent segments the complex task of managing multiple antenna ports into separate virtual port entities. Each virtual port represents a simplified version of the antenna port management task, making operation easier. The segmentation allows for precise channel determination by isolating the measurement process to individual virtual ports rather than dealing with multiple coherent ports simultaneously.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a sounding reference signal (SRS) resource set to be used to signal a virtual port used for a physical uplink shared channel (PUSCH) communication, wherein the virtual port is a combination of at least two non-coherent or partially-coherent antenna ports of the UE using precoding and cyclic delay diversity; and transmit an SRS for the at least two non-coherent or partially-coherent antenna ports using one or more resources of the SRS resource set. Numerous other aspects are provided.