Power Control in Two-Way Relay Networks Using Segmentation
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Solution Overview
Problem
In two-way relay networks, existing power control methods face challenges in maximizing the synthesized and minimum transmission ratings due to power restrictions on terminals and repeaters, and they often require complex implementation algorithms.
Innovation Solution
A power control method that estimates current channels at terminals and repeaters, applies previously determined or newly derived power control parameters using dispersion or centralized methods, and allocates power to maximize transmission ratings while considering power restrictions, using a suboptimal method to reduce complexity and enable real-time implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical power control method is used in a two-way relay network, then the system can operate with power restrictions on terminals and repeater, but the synthesized transmission rating and minimum transmission rating cannot be maximized and the implementation algorithm becomes complex
Solution Approach 1:
The patent segments the power control problem into two independent optimization problems: one for the repeater's power allocation and another for the terminals' power allocation. The repeater's power control is solved first, then the terminals' power control is solved independently given the repeater's power allocation. This segmentation reduces the complexity of the overall implementation algorithm while still maximizing the transmission ratings.
Solution Approach 2:
The patent applies preliminary action by first determining the repeater's optimal power allocation before solving for the terminals' power allocation. The repeater's power control parameters are calculated in advance and used as inputs for the subsequent terminal power control optimization. This sequential approach simplifies the overall algorithm implementation while achieving the maximum transmission rating.
2Use of energy by moving object
If power restrictions are imposed on terminals and repeater, then energy efficiency is improved, but the synthesized transmission rating and minimum transmission rating are reduced
Solution Approach 1:
The patent changes the power allocation parameters dynamically based on channel conditions and power restrictions. By optimizing the power allocation parameters for both the repeater and terminals according to the specific power constraints and channel state information, the system achieves the maximum possible transmission rating while still adhering to the energy efficiency requirements.
Solution Approach 2:
The patent implements dynamic power control where the power allocation parameters are continuously adjusted based on current channel conditions and power restrictions. The system adapts the power levels of terminals and repeater in real-time to maximize transmission ratings while maintaining energy efficiency, rather than using fixed power levels.
3Reliability
If a complex power control algorithm is implemented, then the transmission rating can be maximized, but the system complexity increases and real-time implementation becomes difficult
Solution Approach 1:
The patent segments the complex power control algorithm into two simpler, sequential optimization problems. The first problem optimizes the repeater's power allocation independently, and the second problem optimizes the terminals' power allocation given the repeater's solution. This segmentation reduces computational complexity and enables real-time implementation while still achieving maximum transmission ratings.
Solution Approach 2:
The patent performs preliminary optimization of the repeater's power allocation before solving for the terminals' power allocation. By resolving the repeater's power control parameters in advance, the subsequent terminal power control problem becomes simpler and can be solved more efficiently in real-time, thus enabling practical implementation.
Data Source
AI summary
Provided is a method for power control in a two-way relay network. The power control method may maximize a minimum transmission rating and a synthesized transmission rating of the overall system when there are restrictions on the synthesized power of terminals and a repeater in the two-way relay network. The power control method may include determining a power ratio for allocating power to each terminal and a repeater for each subcarrier under restriction on synthesized power of the terminals and the repeater and determining power allocated for each subcarrier according to the determined power ratio.