8 Tx UE Precoding for Full-Power Partially Coherent Uplink
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Solution Overview
Problem
Existing technologies face challenges in designing full power transmission precoders for partially coherent 8 Tx User Equipment (UE) with two or four antenna groups, as existing methods do not effectively utilize the spatial and polarization properties of the channel, leading to potential destructive combining of signals and reduced coverage.
Innovation Solution
The proposed solution involves configuring a partially coherent UE with 8 Tx antennas to transmit reference signals from each antenna group and using precoders that account for spatial direction and polarization properties, indicated by Precoder Matrix Indicators (PMIs) or Transmit Precoder Matrix Indicators (TPMIs), allowing full power transmission across multiple antenna groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing full power transmission methods are used for partially coherent 8 Tx UE, then transmission power is maintained, but signal destructive combining occurs and coverage is reduced due to ignoring spatial and polarization properties
Solution Approach 1:
The 8 Tx antenna system is segmented into two separate 4 Tx antenna groups. Each antenna group is independently precoded using TPMI (Transmit Precoder Matrix Indication), allowing separate control of spatial and polarization properties for each group. This segmentation enables the system to handle the complexity of 8 Tx partial coherence by breaking it down into manageable 4 Tx sub-problems while maintaining full power transmission capability.
Solution Approach 2:
Different TPMI precoders are applied to different antenna groups based on their specific spatial and polarization characteristics. The first antenna group receives a first TPMI precoder optimized for its local channel properties, while the second antenna group receives a second TPMI precoder optimized for its local properties. This local optimization prevents destructive combining by adapting the precoding to the specific qualities of each antenna group's transmission path.
2Adaptability or versatility
If precoders accounting for spatial and polarization properties are used, then coverage and performance improve, but the system complexity increases due to TPMI indication and configuration
Solution Approach 1:
The system dynamically selects and applies different TPMI precoders for the two antenna groups based on channel conditions. The gNB determines the appropriate TPMI values by evaluating the spatial and polarization properties of the channel for each antenna group, and these TPMI indications are conveyed to the UE through DCI (Downlink Control Information). This dynamic adaptation allows the system to optimize performance for varying channel conditions while managing complexity through standardized procedures.
Solution Approach 2:
TPMI (Transmit Precoder Matrix Indication) serves as an intermediary mechanism that bridges the gap between channel measurement and precoder application. The gNB measures the channel properties, determines the appropriate TPMI values, and communicates them to the UE. The UE then applies the indicated TPMI precoders to the antenna groups. This intermediary approach simplifies the overall system by providing a standardized interface for adapting to channel properties without requiring complex direct optimization algorithms at the UE.
3Power
If full power transmission is implemented across all 8 antennas, then output power is maximized, but destructive signal combining reduces effective coverage
Solution Approach 1:
The full power transmission across 8 antennas is segmented into two separate 4 Tx antenna group transmissions. Each antenna group transmits at full power with its own independently optimized TPMI precoder. This segmentation prevents destructive combining by ensuring that each antenna group's transmission is independently optimized for its specific spatial and polarization characteristics, while still achieving overall full power utilization across all 8 antennas.
Solution Approach 2:
The system changes the precoding parameters (TPMI values) for each antenna group based on their specific channel characteristics. By adjusting the spatial and polarization parameters of the precoders to match the actual channel properties of each antenna group, the system ensures that full power transmission from all 8 antennas results in constructive rather than destructive combining at the receiver.
Data Source
AI summary
Systems and methods for full power transmission for a partially coherent Tx User Equipment (UE) are provided. In some embodiments, the UE receives a configuration that indicates a full power mode of operation; transmits reference signals from each antenna port group of two or more antenna port groups; receives an indication to use a precoder for the full power mode transmission where the indicated precoder indicates polarization and spatial direction for each of the port groups; and transmits a single layer using the indicated precoder on the two or more antenna port groups. In this way, the proposed solution enables full output power to be transmitted in UL for a set of precoders for an 8 Tx partially coherent UE with 2 or 4 antenna group, where the precoders take the spatial and polarization properties of the channel into account, which could improve the coverage and performance in UL.