DMRS Port Grouping for Uplink Interference Reduction
Solution Overview
Problem
In Multi Transmission Reception Point (MTRP) scenarios, the use of the same time-frequency resources by different Demodulation Reference Signal (DMRS) ports leads to mutual interference, affecting the demodulation of Physical Uplink Shared Channel (PUSCH) and reducing the transmission performance of uplink data.
Innovation Solution
A method where a terminal receives target signaling with an antenna port indicator field to determine at least two DMRS port groups or an uplink transmission mode, allowing PUSCHs to use DMRS ports in different groups, thereby reducing interference by utilizing different time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If different DMRS ports occupy the same time-frequency resource, then the signaling overhead is reduced, but mutual interference is caused and demodulation performance deteriorates
Solution Approach 1:
The patent segments DMRS ports into multiple port groups (first DMRS port group and second DMRS port group) where ports within the same group occupy the same time-frequency resources, while ports in different groups occupy different time-frequency resources. This segmentation resolves the contradiction by allowing resource sharing within groups (reducing overhead) while preventing interference between groups (maintaining reliability).
Solution Approach 2:
The patent introduces a new dimension of organization by grouping DMRS ports and assigning different time-frequency resources to different groups. This dimensional approach allows multiple ports to share resources in one dimension (within groups) while being separated in another dimension (between groups), simultaneously achieving overhead reduction and interference prevention.
2Adaptability or versatility
If multiple DMRS ports are used for MTRP scenario, then the transmission capability is improved, but resource interference increases
Solution Approach 1:
The patent divides DMRS ports into separate groups with dedicated time-frequency resources for each group. This segmentation enables multiple transmission capabilities (supporting MTRP) while preventing resource interference between different transmission streams, as each group operates on orthogonal resources.
3Device complexity
If only one group of DMRS ports is indicated in DCI, then the signaling complexity is reduced, but transmission performance in MTRP scenario deteriorates
Solution Approach 1:
The patent makes a single antenna port indicator field in DCI serve multiple functions: it can indicate DMRS ports for single-TRP transmission or for multi-TRP transmission with multiple port groups. This multi-functionality maintains signaling simplicity while enabling advanced MTRP capabilities through the port grouping mechanism.
Data Source
AI summary
This application discloses a reference signal port indication method, a terminal, and a network side device. The reference signal port indication method includes: receiving, by a terminal, target signaling, where the target signaling includes an antenna port indicator field, and the antenna port indicator field is used to indicate a demodulation reference signal (DMRS) port of an uplink channel; and determining, by the terminal, at least two DMRS port groups based on the antenna port indicator field, or determining an uplink transmission mode of the terminal based on the antenna port indicator field.