Uplink Codebook Subset Selection for Phase-Aware Power Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing increasing data traffic, achieving high per-user transmission rates, supporting a large number of devices, and maintaining low latency and energy efficiency, particularly in uplink signal transmission.
Innovation Solution
A method and apparatus for uplink signal transmission in a wireless communication system using a codebook, where a user equipment (UE) transmits capability information about phase differences in antenna ports, receives configuration information for a codebook subset, and determines a precoding matrix based on downlink control information to transmit the uplink signal with full power, maintaining phase differences across some antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a UE transmits capability information about phase differences in antenna ports and uses a codebook subset with specific precoding matrices, then full power transmission is enabled, but device complexity increases
Solution Approach 1:
The UE transmits capability information about phase differences in antenna ports before actual uplink signal transmission. This preliminary action allows the gNB to pre-configure an appropriate codebook subset that maintains phase differences, enabling full power transmission without real-time complex calculations during data transmission
Solution Approach 2:
The system changes the parameter of phase difference maintenance across antenna ports by selecting specific precoding matrices from a configured codebook subset. These matrices are designed to preserve phase relationships, allowing the UE to transmit at full power while maintaining signal integrity through parameter optimization rather than complex real-time processing
2Productivity
If a codebook subset with specific precoding matrices is configured to maintain phase differences, then transmission efficiency improves, but signal processing complexity increases
Solution Approach 1:
The gNB configures a codebook subset containing specific precoding matrices that maintain phase differences before the UE performs uplink transmission. This preliminary configuration reduces the UE's real-time processing burden during actual data transmission, improving transmission efficiency while managing processing complexity through advance preparation
Solution Approach 2:
The codebook subset contains specifically designed precoding matrices that maintain phase differences only where needed (in specific antenna port configurations). This localized application of phase maintenance through targeted matrix selection optimizes transmission efficiency in scenarios requiring it, while avoiding unnecessary processing complexity in other scenarios
3Use of energy by moving object
If full power transmission is implemented using specific precoding matrices, then energy efficiency improves, but system complexity increases
Solution Approach 1:
The capability information transmission and codebook subset configuration are performed in advance, enabling the UE to directly use pre-determined precoding matrices for full power transmission. This eliminates the need for complex real-time power optimization calculations, improving energy efficiency while keeping the actual transmission process simple
Solution Approach 2:
The UE uses its own transmitted capability information about phase differences to enable the gNB to configure an appropriate codebook subset. This self-service approach allows the system to automatically optimize for full power transmission based on the UE's inherent characteristics, improving energy efficiency without requiring complex external control or coordination
Data Source
AI summary
A method of a UE transmitting a codebook based uplink signal in a wireless communication system, the method comprising: transmitting capability information about UE capability that maintains differences between phase values applied to antenna ports for uplink signal transmission; receiving configuration information for determining a codebook subset related to the uplink signal transmission based on the capability information; receiving DCI for determining a precoding matrix applied to the uplink signal transmission; determining a precoding matrix to be applied for the uplink signal transmission, based on the DCI, from the codebook subset determined based on the configuration information, and transmitting the uplink signal, based on the determined precoding matrix, wherein, based on that the differences between phase values are maintained at some antenna ports, the codebook subset includes at least one specific precoding matrix applying different phase values to the antenna ports included in some or all of some antennas.