Uplink Power Control for Data and Control Channels
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Solution Overview
Problem
Conventional communication systems do not differentiate between uplink transmission power control for different channels, leading to suboptimal performance due to interference and varying channel characteristics, particularly in OFDMA systems where short-term fading compensation affects interference variance.
Innovation Solution
Implementing differential uplink transmission power control schemes for the uplink data and control channels using Open Loop Power Control (OLPC) and Closed Loop Power Control (CLPC) equations, with specific parameters and adjustments based on interference levels and channel characteristics to maintain constant output power and optimize system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional unified uplink transmission power control is used for all channels, then device complexity is reduced and ease of operation is improved, but system performance deteriorates due to interference and varying channel characteristics
Solution Approach 1:
The patent segments the uplink power control into separate control mechanisms for data channels and control channels. Each channel type has its own power control equation and parameters, allowing optimized performance for each channel type while managing complexity through structured separation.
Solution Approach 2:
The patent applies different power control strategies and parameters to different channel types based on their specific characteristics. Control channels use one set of power control equations while data channels use another, ensuring each channel receives locally optimized power control suited to its function and interference profile.
2Reliability
If Open Loop Power Control (OLPC) is used for uplink transmission, then short-term fading compensation is achieved, but interference variance increases affecting system performance
Solution Approach 1:
The patent modifies the power control parameters specifically for control channels, using different path loss compensation factors and offset values compared to data channels. This parameter differentiation allows OLPC to effectively compensate for fading in control channels while minimizing the generation of interference variance that would affect overall system performance.
3Object-affected harmful factors
If Closed Loop Power Control (CLPC) is used for uplink transmission, then interference is reduced, but responsiveness to rapid channel changes decreases
Solution Approach 1:
The patent segments the power control approach so that data channels utilize CLPC to reduce interference, while control channels employ a modified OLPC approach that responds more rapidly to channel changes. This segmentation allows each channel type to benefit from the strengths of different control mechanisms without the drawbacks.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities where the power control parameters can be adapted based on channel conditions and channel type. This allows the system to switch between or combine OLPC and CLPC characteristics dynamically, achieving both rapid response to channel changes and effective interference reduction when conditions permit.
Data Source
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AI summary
An apparatus and method for controlling uplink transmission power in a communication system are provided. In the method, transmission power of an uplink data channel signal is determined according to an Open Loop Power Control (OLPC) scheme and transmission power of an uplink control channel signal is determined according to a Closed Loop Power Control (CLPC) scheme.