Uplink PTRS-DMRS Port Mapping for Multi-TRP Phase Tracking
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Solution Overview
Problem
Existing 5G communication systems face challenges in providing seamless service delivery due to the complexity of network cooperative communication systems, particularly in managing phase tracking reference signals for multiple transmission and reception points, which affects the reliability and efficiency of uplink data transmission.
Innovation Solution
A method and apparatus for transmitting and receiving uplink phase tracking reference signals (PTRS) in a network cooperative communication system, involving the use of PTRS-demodulation reference signal (DMRS) association information to determine PTRS ports for each sounding reference signal resource set, with specific bit configurations for associating PTRS and DMRS ports across multiple transmission and reception points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PTRS ports are managed separately for each TRP without standardized association mechanisms, then flexibility in multi-TRP configuration is improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the PTRS-DMRS association management by introducing separate indication mechanisms for different TRPs. Each TRP's PTRS port association with DMRS ports is independently configurable through DCI fields, allowing separate management of multi-TRP resources while maintaining overall system coordination
Solution Approach 2:
The patent adds a new dimension to the control signaling by introducing PTRS-DMRS association indication fields in DCI format 0_1. This additional control dimension enables precise mapping between PTRS ports and DMRS ports across multiple TRPs without requiring complete reconfiguration of existing signaling structures
2Measurement precision
If multiple PTRS ports are configured for multiple TRPs, then phase tracking accuracy for uplink data transmission is improved, but signaling overhead and resource consumption increase
Solution Approach 1:
The patent makes the DCI format 0_1 multi-functional by incorporating PTRS-DMRS association indication fields that can simultaneously configure multiple PTRS ports for multiple TRPs. This universal signaling mechanism handles both single-TRP and multi-TRP scenarios without requiring separate signaling procedures
Solution Approach 2:
The patent changes the parameter configuration by allowing dynamic adjustment of PTRS port associations through DCI fields. The number of PTRS ports and their mapping to DMRS ports can be flexibly modified based on the actual multi-TRP deployment scenario, optimizing the balance between tracking accuracy and signaling overhead
3Productivity
If PTRS-DMRS association information is included in DCI format 0_1, then uplink data transmission efficiency is improved, but downlink control information size and processing complexity increase
Solution Approach 1:
The patent performs preliminary configuration by including PTRS-DMRS association information in the DCI format 01 before uplink data transmission. This advance indication allows the UE to pre-configure PTRS port mappings, reducing processing complexity during actual data transmission while maintaining high transmission efficiency
4Reliability
If non-codebook based PUSCH repetitive transmission is supported with multi-TRP, then service delivery reliability is improved, but management complexity of reference signals increases
Solution Approach 1:
The patent introduces DMRS ports as an intermediary layer between PTRS ports and TRPs. By establishing PTRS-DMRS port associations that map to specific TRPs, the system simplifies the management of reference signals for non-codebook based PUSCH repetitive transmission, reducing complexity while maintaining reliability
Data Source
AI summary
According to present disclosure, there is provided a method for repetitive transmitting physical uplink shared channel (PUSCH) to a multiple transmission and reception point (mTRP) performed by a user equipment (UE). The method comprises receiving, from a base station, downlink control information (DCI) including phase tracking reference signal (PTRS)—demodulation reference signal (DMRS) association information; based on the PTRS-DMRS association information, determining PTRS port for each sounding reference signal (SRS) resource set among a plurality of SRS resource set; and based on the determined PTRS port, transmitting PTRS.