Wireless Power Control via Common Parameter
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Solution Overview
Problem
Conventional power and rate control schemes in wireless communication systems fail to maximize aggregate data rate and balance communication quality effectively, especially in environments with multiple interfering resources, leading to inefficient power usage and unstable performance.
Innovation Solution
A power control scheme that assigns a common control parameter to communication resources, determining individual transmit power parameters based on a condition where total received power divided by path gain equals a common control parameter, maximizing aggregate data rate while minimizing power consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional power control schemes control SIR or CIR to target values, then communication quality is maintained, but aggregate data rate is not maximized and power efficiency deteriorates
Solution Approach 1:
The patent changes the fundamental power control parameter from SIR/CIR target values to a received power threshold. This parameter transformation allows the system to directly control the received power level without being constrained by interference ratio targets, thereby maximizing aggregate data rate while improving power efficiency through the water-filling power allocation strategy.
Solution Approach 2:
The patent implements dynamic power allocation where transmit powers are continuously adjusted based on current channel conditions and interference levels. The water-filling algorithm dynamically distributes power across different users and channels, allocating more power to channels with better conditions and less to poorer channels, thus optimizing the aggregate data rate in real-time while maintaining power efficiency.
2Device complexity
If distributed power control algorithms are used to reduce information collection effort, then system complexity is reduced, but scaling becomes difficult due to background noise
Solution Approach 1:
The patent extracts and eliminates the problematic element of background noise from the power control equations. By formulating the power control based on received power thresholds rather than SIR/CIR ratios, the method removes the noise-related scaling issues that plague distributed algorithms, enabling them to scale effectively to large networks while maintaining low system complexity.
3Reliability
If cell powers are allocated to achieve equal SIR for all users, then quality balancing is achieved, but total power consumption increases and aggregate throughput is limited
Solution Approach 1:
The patent applies local quality by allowing different received power levels for different users based on their individual channel conditions and requirements, rather than enforcing uniform SIR across all users. This differentiated approach enables the system to maintain adequate quality for each user while significantly reducing total power consumption by not over-provisioning power to users with good channel conditions.
4Ease of operation
If constant received power control is implemented at base station, then power control is simplified, but co-channel interference is not significantly reduced
Solution Approach 1:
The patent implements a feedback mechanism where users report their received power levels and channel conditions to the base station. The base station uses this feedback information to dynamically adjust transmit powers, achieving both simplified control operation and significant reduction of co-channel interference through coordinated power management based on real-time system state information.
Data Source
AI summary
A power control procedure is based on assigning a common control parameter to considered interfering communication resources, and using the control parameter together with a unique power control condition for determining the individual transmit power parameters of the communication resources. In particular, for each one of at least a subset of said communication resources, an individual transmit power parameter is determined based on a power control condition implying that the total received power divided with a path gain of the communication resource should correspond to the common control parameter. The determined transmit power parameters are then used for controlling the transmit powers of the corresponding communication resources. This process helps to maximize aggregate data rate for any given amount of total invested power.