Uplink Power Control in Carrier Aggregation Systems
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Solution Overview
Problem
In wireless communication systems, particularly in carrier aggregation-based systems, there is a challenge in efficiently transmitting and receiving uplink signals due to limitations in power management, leading to inefficiencies in inter-site carrier aggregation scenarios where latency and power control become significant issues.
Innovation Solution
A method and apparatus for controlling uplink power by adjusting the transmit power of cell groups to prevent exceeding maximum power limits, using a scaling factor proportional to the number of cells in each group, and reducing power across all groups to ensure efficient transmission in both intra-site and inter-site carrier aggregation scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit power of multiple cell groups is increased to improve uplink signal transmission efficiency, then the uplink transmission quality is improved, but the total transmit power may exceed the maximum power limit set to the user equipment
Solution Approach 1:
The patent segments the cell groups into different categories (first cell groups and second cell groups) based on their power characteristics and requirements. By dividing the cell groups, the system can apply different power control strategies to each segment, allowing optimized power distribution that prevents total power from exceeding the maximum limit while maintaining efficient uplink transmission.
Solution Approach 2:
The patent applies local quality by differentiating power control measures for different cell groups. First cell groups and second cell groups are treated differently based on their specific power limits and transmission requirements. This localized approach allows each cell group to operate at optimal power levels without causing the overall system to exceed maximum power constraints.
2Device complexity
If power control is performed separately for each cell group, then power management complexity is reduced, but the system cannot optimize overall power distribution across multiple cell groups
Solution Approach 1:
The patent merges the power control mechanisms for multiple cell groups into a unified framework. By establishing a common power control method that considers all cell groups simultaneously, the system achieves both simplified management (comparing to individual separate controls) and optimized overall power distribution through coordinated control of first and second cell groups.
3Power
If transmit power is reduced to stay within maximum power limit, then power constraint is satisfied, but uplink transmission efficiency deteriorates
Solution Approach 1:
The patent implements dynamic power control where the transmit power of cell groups is continuously adjusted based on real-time conditions. The system dynamically allocates power between first and second cell groups, increasing power where needed and reducing it where constraints apply, thereby maintaining both power limit compliance and transmission efficiency through adaptive management.
Data Source
AI summary
The present invention relates to a wireless communication system, particularly, a method comprising: adjusting transmission power of one or more cells within a first cell group such that transmission power of the first cell group does not exceed a maximum power value set in the first group; adjusting transmission power of one or more cells within a second cell group such that transmission power of the second cell group does not exceed a maximum power value set in the second group; additionally reducing the transmission power of the first cell group and the second cell group if total transmission power of the whole cell group including the first cell group and the second cell group exceeds a maximum power value set in the terminal; and performing uplink transmission in the first cell group and the second cell group by using the additionally reduced transmission power, and a device therefore.