3-Bit Rank Information for 8-Layer Spatial Multiplexing
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Solution Overview
Problem
Conventional mobile radio communication systems are limited by the number of ports they can accommodate, which restricts the potential for improving transmission efficiency.
Innovation Solution
A communication system that supports up to 8 spatial multiplex ranks by using a 3-bit rank information in control signals to manage reference signals, allowing for efficient signaling and port extension, enabling higher transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of ports is increased to improve transmission efficiency, then the transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent changes the parameter of control information format by introducing 3-bit rank information to indicate the number of spatial multiplexed layers. This allows the system to support up to 8 ports without proportionally increasing control signal complexity, as the rank information efficiently indicates the active port configuration among the 8 possible ports.
Solution Approach 2:
The patent segments the port configuration into rank information (3 bits indicating 1-8 layers) and separate control information for each layer. This segmentation allows the system to manage multiple ports systematically by first determining the rank (number of active layers) and then configuring individual layer parameters, reducing overall control complexity.
2Productivity
If 3-bit rank information is used to manage reference signals for up to 8 spatial multiplex ranks, then the signaling efficiency is improved, but the measurement precision for port identification may be affected
Solution Approach 1:
The patent employs dynamic control information where the 3-bit rank information is combined with additional control parameters that vary based on the indicated rank. This dynamic approach ensures that sufficient bits are allocated for port identification at each rank level, maintaining measurement precision while optimizing signaling efficiency for the actual number of active ports.
Solution Approach 2:
The patent resolves the precision-efficiency tradeoff by adding a dimensional layer of control information specific to each spatial multiplexed layer. Instead of using a fixed number of bits for port identification, the system adds layer-specific control information dimensions, ensuring precise port identification while maintaining compact 3-bit rank signaling.
Data Source
AI summary
A transmission device that generates control information including 3-bit information and transmits a physical downlink shared channel, a reference signal for demodulation of the physical downlink shared channel, and the control information, wherein, in a case that all codewords which are mapped to the physical downlink shared channel are enabled, among a first value to an eighth value indicated by the 3-bit information, the third value to the eighth value indicate that the number of layers is from 3 to 8 respectively, and the first value and the second value indicate that the number of layers is equal to 2, and the first value indicates that the scrambling identity for the reference signal is equal to 0 and the second value indicates that the scrambling identity is equal to 1.