Uplink Precoding Codebook Subset Selection for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling explosively increasing data traffic, requiring advanced technologies to support higher data rates, numerous connected devices, low latency, and high-energy efficiency, particularly in transmitting uplink signals effectively.
Innovation Solution
A method for transmitting uplink signals based on a codebook in a wireless communication system, where a user equipment (UE) receives downlink control information to determine a precoding matrix from a codebook subset, and transmits the uplink signal using this matrix, maintaining phase differences between antenna ports for full power transmission across all or some antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a codebook subset with phase value differences is used for uplink signal transmission, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The codebook is segmented into multiple codebook subsets, each containing precoding matrices with specific phase value characteristics. The UE determines the appropriate codebook subset based on channel conditions and transmission requirements, thereby improving transmission reliability while managing device complexity through structured organization.
Solution Approach 2:
The system dynamically selects precoding matrices from different codebook subsets based on varying channel conditions and transmission parameters. This dynamic adaptation allows the system to optimize transmission reliability for different scenarios without requiring the UE to process all possible precoding matrices, thus balancing reliability improvement with complexity management.
2Productivity
If full power transmission is applied across all antenna ports, then data rate is improved, but energy efficiency deteriorates
Solution Approach 1:
Different antenna ports are assigned different power levels based on channel conditions and precoding matrix characteristics. Instead of uniform full power transmission, the system applies local quality optimization by transmitting at full power only on antenna ports with favorable channel conditions while reducing or muting transmission on ports with poor conditions, thereby improving overall data rate while enhancing energy efficiency.
Solution Approach 2:
The system changes the transmission power parameter dynamically based on channel state information and precoding matrix selection. By adjusting power allocation across antenna ports according to channel conditions, the system achieves high data rates when conditions permit while conserving energy when conditions are poor, thus resolving the contradiction between productivity and energy usage.
Data Source
AI summary
A method for transmitting an uplink signal based on a codebook by a UE in a wireless communication system includes: receiving, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal; determining the precoding matrix applied to the transmission of the uplink signal from a codebook subset related to the transmission of the uplink signal based on the DCI; and transmitting, to the base station, the uplink signal based on the determined precoding matrix, I which based on that a difference between phase values applied to antenna ports for the transmission of the uplink signal is maintained in some antenna ports among all antenna port pairs, the codebook subset includes at least one specific precoding matrix applying different phase values to antenna ports included in all or some of the some antenna ports.