Uplink MIMO Codebook Subsets for Lower-Complexity Precoding
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Solution Overview
Problem
The existing wireless communication systems face challenges in supporting high data traffic, increased transmission rates, and low latency while efficiently utilizing resources, particularly in uplink transmission and reception, especially with the introduction of advanced technologies like Massive MIMO and Non-Orthogonal Multiple Access.
Innovation Solution
A method and apparatus for uplink transmission and reception using partial coherent codebook subsets, including specific precoding matrices for uplink transmission and reception, are introduced to optimize communication in wireless systems, specifically utilizing codebook subsets with varying numbers of zeros and non-zeros per column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional codebooks are used for uplink transmission, then system compatibility is maintained, but transmission efficiency and data rates are limited
Solution Approach 1:
The codebook is segmented into multiple codebook subsets, each optimized for specific transmission scenarios. The UE can select from different subsets (first type with four zeros per column, second type with six zeros per column) based on channel conditions and capability, enabling efficient transmission without requiring a single complex comprehensive codebook.
Solution Approach 2:
The system dynamically selects codebook subsets based on UE capability information and channel conditions. The UE reports its supported codebook subset type to the base station, which then configures the appropriate subset, allowing the system to adapt between different precoding matrix structures (four zeros vs six zeros per column) for optimal performance.
2Speed
If advanced precoding techniques are implemented, then data rates increase, but system complexity and processing overhead increase
Solution Approach 1:
Different codebook subsets provide different local optimizations: the first type with four zeros per column optimizes for certain MIMO configurations, while the second type with six zeros per column optimizes for others. This localized optimization allows high data rates for specific scenarios without requiring all UEs to implement the most complex techniques universally.
Solution Approach 2:
The system changes the parameter of zero values per column in precoding matrices between different codebook subsets. By selecting between subsets with four zeros or six zeros per column, the system adjusts the precoding complexity parameter to match UE capabilities and channel conditions, achieving high data rates without unnecessary processing complexity.
3Productivity
If codebook subset configuration is implemented, then resource utilization improves, but signaling overhead increases
Solution Approach 1:
Instead of configuring the entire codebook, the system only configures the relevant codebook subset type (first type or second type) based on UE capability. This partial configuration approach improves resource utilization for the selected subset while minimizing signaling overhead by not transmitting information about unused subsets.
Data Source
AI summary
A method and apparatus for performing uplink transmission and reception in a wireless communication system are disclosed. According to an embodiment of the present disclosure, a method for performing uplink transmission in a wireless communication system may include: transmitting capability information related to a codebook subset for uplink transmission supported by the UE to a base station; receiving configuration information related to a codebook subset based on the capability information from the base station; and performing the uplink transmission based on the configuration information, and the capability information includes a first type of partial coherent codebook subset or a second type of partial coherent codebook subset, and the first type of partial coherent codebook subset includes at least one first precoding matrix having four zeros and four non-zero values per column, and the second type of partial coherent codebook subset includes at least one second precoding matrix having six zeros and two non-zero values for each column.