Multi-Beam PUSCH PTRS-DMRS Port Mapping With Low DCI Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in effectively associating phase tracking reference signals (PTRS) and demodulation reference signals (DMRS) ports for multi-beam physical uplink shared channel (PUSCH) transmissions, particularly in scenarios involving multiple beams, due to the limitations of current DCI signaling methods.
Innovation Solution
The proposed solution involves methods to indicate PTRS and DMRS port associations for both codebook (CB) and non-codebook (NCB) based multi-beam PUSCH transmissions using enhanced DCI fields and higher layer signaling, allowing for precise association of PTRS and DMRS ports across multiple beams with reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing DCI signaling methods are used for PTRS and DMRS port association in multi-beam PUSCH transmissions, then the signaling overhead is reduced, but the association accuracy and phase noise compensation effectiveness deteriorate
Solution Approach 1:
The patent segments the DCI signaling into multiple fields with different functions: a first DCI field indicates the number of beams and PTRS port-to-beam mapping, while a second DCI field indicates DMRS port-to-beam mapping. This segmentation allows precise association of PTRS and DMRS ports with specific beams while maintaining efficient signaling through structured field organization.
2Device complexity
If existing DCI signaling methods are used for PTRS and DMRS port association in multi-beam PUSCH transmissions, then the system complexity is reduced, but the transmission reliability deteriorates
Solution Approach 1:
The patent introduces dynamic beam indication mechanisms where the DCI signaling adaptively indicates the number of beams and the mapping relationships between PTRS ports, DMRS ports, and beams. This dynamic approach allows the system to flexibly adjust to different transmission scenarios while maintaining reliable phase noise compensation through accurate port-beam associations.
3Loss of information
If simple DCI fields are used for beam and port indication, then the signaling overhead is reduced, but the ability to support multiple beams with accurate phase compensation deteriorates
Solution Approach 1:
The patent adds dimensional structure to the DCI signaling by introducing multiple fields that operate at different levels: one field dimension indicates the number of beams and PTRS port mapping, while another field dimension indicates DMRS port mapping. This multi-dimensional signaling approach enables comprehensive multi-beam support with accurate phase compensation without excessive overhead.
Data Source
AI summary
Systems and methods for associating phase tracking reference signal (PTRS) and demodulation reference signal (DMRS) ports for multi-beam physical uplink shared channel (PUSCH) transmissions are described herein. A base station may provide, to a user equipment (UE), PTRS and DMRS port associations for the multiple beams on which the PUSCH is transmitted. In some cases, a 2-bit downlink control information (DCI) field may be used to alternatively provide single beam or multiple beam PTRS and DMRS port associations to a UE. For non-codebook (NCB) based transmissions, the UE may alternatively determine PTRS and DMRS port associations for multiple beams independently of any PTRS and DMRS port association indicated in DCI.