Uplink Precoder Phase Rotation for Power Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, particularly in the NR system, there is a challenge in achieving uniform transmission power distribution across UL antenna ports due to the use of wideband UL precoding, leading to power imbalances and increased implementation costs or reduced coverage.
Innovation Solution
The method involves modifying the UL codebook and introducing a phase rotation factor or a permutation matrix in the UL precoder to equalize transmission power across antenna ports, ensuring uniform power allocation by adjusting the phase based on the DMRS RE frequency position, layer number, or allocated DMRS port number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If wideband UL precoding is used in 5G NR systems, then transmission distance and coverage are improved, but transmission power distribution across antenna ports becomes non-uniform
Solution Approach 1:
The patent applies local quality by making the precoding configuration specific to each antenna port. Different antenna ports use different precoding matrices selected from codebooks, allowing each port to have optimized local characteristics. This ensures that each antenna port transmits with appropriate power levels tailored to its specific channel conditions, achieving uniform power distribution across ports while maintaining extended transmission distance through wideband precoding.
2Length of stationary object
If wideband UL precoding is used to extend coverage, then transmission distance increases, but implementation cost increases due to power management complexity
Solution Approach 1:
The patent implements preliminary action by pre-configuring codebooks containing multiple precoding matrices before transmission begins. The base station and terminal device store these precoding matrices in advance, and the terminal device selects appropriate matrices from the pre-configured codebooks based on channel conditions. This preliminary preparation eliminates the need for complex real-time power management calculations during transmission, reducing implementation complexity while maintaining extended coverage through wideband precoding.
3Productivity
If non-uniform power distribution occurs across antenna ports, then power allocation efficiency decreases, but system complexity increases
Solution Approach 1:
The patent applies equipotentiality by ensuring that all antenna ports operate at equivalent power levels through careful selection of precoding matrices from codebooks. The terminal device configures precoding for each antenna port such that the transmitted power is uniform across all ports, creating an equipotential power distribution state. This approach simplifies power allocation management and reduces system complexity by eliminating power imbalances that would otherwise require complex compensation mechanisms.
Data Source
AI summary
A method of operating a terminal for controlling transmission power of the terminal in a wireless communication system is provided. The method includes receiving, from a base station, a set of first sequences and an identifier for indicating uplink precoding information, generating a set of second sequences based on the set of first sequences and the uplink precoding information, and transmitting, to the base station, the set of second sequences at antenna ports, wherein each of the antenna ports corresponds to each sequence included in the set of second sequences, and wherein at least one of the set of first sequences and the uplink precoding information is generated based on at least one coefficient.