Precoding Index Signaling for Single-Codeword Multi-Layer LTE
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Solution Overview
Problem
Existing LTE systems that support only single-codeword transmission face limitations in configuring multi-layer transmission, leading to reduced transmission efficiency and excessive overhead in precoding information notification.
Innovation Solution
The proposed solution involves generating and sending an index indicating precoding information for single-codeword transmission, allowing for reduced bit usage in DCI and increased reliability, while supporting various precoding configurations for different channel conditions and antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing LTE systems use traditional precoding information notification methods for single-codeword transmission, then system compatibility is maintained, but transmission efficiency is reduced and overhead is excessive
Solution Approach 1:
The patent changes the parameter representation by introducing a new precoding indication table specifically designed for single-codeword multi-layer transmission scenarios. This new table uses optimized parameters that reduce the number of bits required for precoding information notification while maintaining accurate precoding indication, thereby resolving the contradiction between transmission efficiency and overhead reduction.
Solution Approach 2:
The patent segments the precoding information notification by creating separate indication mechanisms for single-codeword and multi-codeword scenarios. By dividing the notification approach according to codeword quantity, the system can use the optimized new table for single-codeword cases (reducing overhead) while maintaining the original table for multi-codeword cases (ensuring compatibility), thus resolving the contradiction.
2Adaptability or versatility
If systems like sTTI that support only single-codeword transmission use traditional precoding methods, then system simplicity is maintained, but multi-layer transmission configuration is limited
Solution Approach 1:
The patent introduces dynamic adaptability by enabling single-codeword systems to dynamically configure multi-layer transmission through the new precoding indication table. The system can adaptively select from multiple precoding matrices indicated by the optimized index, allowing flexible multi-layer configuration without requiring the system to support multiple codewords, thus resolving the contradiction between adaptability and simplicity.
Solution Approach 2:
The new precoding indication table serves multiple functions: it enables multi-layer transmission configuration in single-codeword systems, reduces notification overhead, and maintains compatibility with existing systems. By making the precoding indication mechanism universal across different transmission scenarios, the patent resolves the contradiction between enhancing multi-layer configuration capability and maintaining system simplicity.
Data Source
AI summary
Embodiments of this application provide example information receiving methods and receiving apparatuses. One example information receiving method includes receiving, by a receiving apparatus, an index from a sending apparatus, wherein the index indicates precoding information used for a single codeword. The receiving apparatus can then determine, based on the index, the precoding information used for the single codeword.