Uplink Power Control via Subframe Group Segmentation
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Solution Overview
Problem
In LTE-TDD systems, terminals face interference challenges during uplink transmission due to varying interferences from other cells and base stations, leading to suboptimal uplink transmission power adjustments that can degrade SINR and impact communication performance.
Innovation Solution
The method involves dividing uplink subframes into different subframe groups based on interference levels and using accumulative or absolute power adjustment values to determine optimal uplink transmission power for each group, ensuring suitable power settings for maintaining SINR requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal adjusts uplink transmission power according to the TPC command configured by the base station using the power adjustment mechanism in the related art, then the uplink transmission power can be adjusted in simple and easy-to-implement manner, but the SINR requirements of the uplink transmission cannot be ensured when other base stations implement downlink transmission causing significantly large and varying interferences
Solution Approach 1:
The patent segments uplink subframes into different subframe groups based on interference characteristics. Specifically, uplink subframes are divided into first subframe groups (where surrounding base stations perform uplink transmission) and second subframe groups (where surrounding base stations perform downlink transmission). The terminal then applies different power adjustment mechanisms to different subframe groups, using TPC commands for first subframe groups and path loss compensation-based adjustment for second subframe groups, thereby ensuring SINR requirements are met under varying interference conditions.
Solution Approach 2:
The patent implements dynamic power adjustment by adapting the power control mechanism according to the subframe type and interference conditions. For second subframe groups experiencing high and varying interference from downlink transmissions, the terminal dynamically adjusts power using path loss compensation with interference margin. This dynamic adaptation allows the system to maintain reliable uplink transmission performance despite changing interference environments.
2Device complexity
If the terminal uses a single power adjustment mechanism for all uplink subframes, then the power control implementation is simple, but the uplink transmission performance deteriorates when interference levels vary significantly across different subframes
Solution Approach 1:
The patent divides uplink subframes into distinct segments (subframe groups) based on interference characteristics. First subframe groups correspond to periods when surrounding base stations perform uplink transmission with relatively stable interference, while second subframe groups correspond to periods when surrounding base stations perform downlink transmission with significantly large and varying interference. This segmentation enables the terminal to apply appropriate power adjustment strategies to each group, maintaining good uplink transmission performance without excessive complexity.
Solution Approach 2:
The patent applies different power control qualities to different subframe groups. For second subframe groups experiencing severe interference, the terminal uses path loss compensation-based power adjustment with interference margin, providing higher power adjustment precision and reliability. For first subframe groups with milder interference, the terminal uses simpler TPC command-based adjustment. This local quality differentiation ensures optimal transmission performance in each local context.
3Reliability
If the terminal increases uplink transmission power to overcome high interference from downlink transmissions, then the SINR can be maintained, but the power consumption increases and may cause uplink interference to other cells
Solution Approach 1:
The patent employs feedback-based power control where the terminal measures the downlink path loss and receives TPC commands from the base station to adjust uplink transmission power appropriately. For second subframe groups, the terminal calculates power based on path loss compensation with interference margin, and for first subframe groups, it uses TPC commands. This feedback mechanism ensures power is increased only when necessary to maintain SINR, avoiding excessive power consumption and uplink interference to other cells.
Solution Approach 2:
The patent changes the power control parameters dynamically based on subframe group type. For second subframe groups with high interference, the terminal uses path loss compensation factor and interference margin parameters to determine power. For first subframe groups, it uses TPC command adjustments. This parameter change strategy allows the terminal to maintain SINR requirements while avoiding excessive power increase that would cause interference to other cells.
Data Source
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AI summary
The embodiments of the present invention disclose an uplink power control method, a terminal and a base station, which can adjust or determine uplink transmission power of a terminal on subframes which belong to different subframe groups respectively. The method includes: a base station determining subframe group information, the subframe group information being used by a terminal to determine uplink transmission power adjustment amounts on subframes which belong to different subframe groups; and the base station transmitting the subframe group information to the terminal. A terminal determines uplink transmission power adjustment amounts on subframes which belong to different subframe groups, and determines uplink transmission power on corresponding subframes according to the determined uplink transmission power adjustment amounts on the subframes which belong to the different subframe groups.