PT-RS Port Indication for Non-Codebook Uplink PUSCH
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Solution Overview
Problem
Existing methods for indicating Phase-Tracking Reference Signal (PT-RS) to Demodulation Reference Signal (DMRS) port association in non-codebook-based uplink PUSCH transmission are inadequate, particularly when multiple SRS resources are configured, as they do not efficiently manage the number of indication bits required for accurate association, especially with increasing numbers of SRS resources and PT-RS ports.
Innovation Solution
A method and device that determine the number of bits for PT-RS to DMRS association in the Downlink Control Information (DCI) based on the number of SRS resources, PT-RS ports, and the maximum uplink rank supported by the User Equipment (UE), allowing for efficient indication of the association relationship between PT-RS and DMRS ports, with specific bit allocation strategies for different configurations of SRS resources and PT-RS ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of indication bits for PT-RS to DMRS association is fixed for single-PT-RS configuration, then the indication method is simple, but it cannot accommodate multiple SRS resources and PT-RS ports configurations
Solution Approach 1:
The patent applies dynamics by making the indication method adaptive rather than fixed. The base station dynamically selects between two indication methods based on the actual configuration: using a first indication method when there is one PT-RS port, and a second indication method when there are multiple PT-RS ports. This dynamic adaptation allows the system to handle different configuration scenarios efficiently without unnecessary complexity.
Solution Approach 2:
The patent changes the parameter of indication bits from a fixed value to a variable value that adapts to the configuration. When multiple SRS resources are configured, the system changes the number of indication bits to match the number of PT-RS ports, allowing accurate association indication while maintaining efficiency by not using excessive bits when not needed.
2Measurement precision
If multiple indication bits are used to indicate PT-RS association for multiple SRS resources, then accurate association can be indicated, but the DCI overhead increases
Solution Approach 1:
The patent optimizes the parameter of indication bits by making it variable rather than fixed. The system determines the number of indication bits based on the actual number of PT-RS ports configured. When there is only one PT-RS port, fewer bits are used; when there are multiple PT-RS ports, the system uses exactly enough bits to indicate the correct association. This parameter adaptation ensures accurate indication while minimizing DCI overhead.
3Reliability
If a fixed PT-RS to DMRS association method is used, then the indication process is simple, but it fails when SRS resources share the same PT-RS
Solution Approach 1:
The patent applies dynamics by implementing a conditional indication approach. The base station dynamically determines which indication method to use based on whether SRS resources share the same PT-RS. When SRS resources share a PT-RS, the system uses an indication method that explicitly handles this scenario by indicating the association between the shared PT-RS and the appropriate DMRS port. This dynamic approach ensures reliable indication while avoiding unnecessary complexity in configurations where sharing does not occur.
Data Source
AI summary
The present disclosure provides a method and a device for indicating PT-RS port for non-codebook-based uplink PUSCH transmission, and a base station. The method includes: determining a number of bits of a PTRS-DMRS association in a DCI to be transmitted according to a number of SRS resources, a number of PT-RS ports, and a maximum uplink rank number supported by a UE; and transmitting the DCI to the UE, wherein the DCI carries indication bits which have a same number with the bits and apply to indicate an association relationship between the PT-RS ports and the DMRS ports. The present disclosure realizes indication of association relationships between PT-RS ports and DMRS ports in the event of multiple PT-RS ports.