UL Precoding Matrix Signaling for Eight-Port UE PUSCH
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing UL precoding schemes for UEs with eight antenna ports, particularly for full coherent and non-coherent UEs, leading to resource wastage and inefficiencies in configuring precoding matrices.
Innovation Solution
The proposed solution involves specific TPMI field mechanisms for DCI to indicate precoding matrices, including bitmaps and oversampling factors, tailored for full coherent and non-coherent UEs with eight antenna ports, reducing the need for extensive RRC signaling and optimizing precoder configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive RRC signaling is used to configure precoding matrices for UEs with eight antenna ports, then complete precoding configuration can be achieved, but signaling overhead increases and resource efficiency decreases
Solution Approach 1:
The patent extracts the essential precoding information from extensive RRC signaling and concentrates it into a compact TPMI field within DCI. Instead of configuring all precoding parameters through lengthy RRC messages, the solution identifies and transmits only the critical TPMI indicator that directly specifies the precoding matrix, thereby reducing signaling overhead while maintaining configuration completeness.
Solution Approach 2:
The patent changes the parameter representation by introducing a simplified TPMI field with specific bit allocations for different UE types (full coherent vs. non-coherent). This parameter transformation converts complex precoding configurations into concise bitmap representations, where different bit patterns directly map to predefined precoding matrices, achieving efficient signaling without loss of configuration detail.
2Measurement precision
If separate precoding schemes are designed for full coherent and non-coherent UEs, then precoding accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the UE population into distinct categories (full coherent with 8 antenna ports and non-coherent with 8 antenna ports) and designs specialized TPMI field structures for each segment. This segmentation allows tailored precoding accuracy for each UE type while managing system complexity through structured, type-specific configurations rather than a single complex universal scheme.
Solution Approach 2:
The patent creates a universal TPMI field mechanism that serves multiple functions: it identifies UE type, specifies precoding matrix selection, and indicates antenna port mappings. This multi-functional approach reduces system complexity by consolidating what would otherwise require separate signaling mechanisms for each UE type into a single unified field structure.
3Loss of energy
If a compact TPMI field is used to indicate precoding matrices, then signaling overhead is reduced, but the ability to convey detailed precoding information may be limited
Solution Approach 1:
The patent applies preliminary action by pre-defining a set of precoding matrices and their corresponding TPMI representations before actual PUSCH transmission. The gNB and UE both have identical knowledge of the TPMI-to-precoding-matrix mapping, allowing the compact field to convey complete precoding information without requiring detailed real-time signaling. The information is prepared in advance and simply referenced during scheduling.
Solution Approach 2:
The TPMI field acts as an intermediary that bridges the gap between compact signaling and detailed precoding information. Instead of transmitting full precoding matrices directly, the TPMI field serves as a reference key that both gNB and UE use to retrieve the actual precoding configuration from pre-agreed codebooks, thereby conveying complete information through minimal bits.
Data Source
AI summary
Methods and apparatuses for UL precoding schemes for full coherent UE and non-coherent UE with eight antenna ports are disclosed. In one embodiment, a UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a DCI scheduling a PUSCH, wherein the DCI includes a TPMI field indicating information on a precoding matrix; and determine the precoding matrix for the scheduled PUSCH according to the TPMI field.