Cell Node Power Control via Gradient Information Exchange
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Solution Overview
Problem
In cellular systems, optimizing downlink performance is challenging due to the need for setting data communication powers that balance the utilization of network resources among cell nodes, where excessive power by one node can negatively impact adjacent nodes, leading to suboptimal network utilization.
Innovation Solution
The method involves generating and processing cell node gradient information based on multiple-codeword channel quality indicators (CQI) in MIMO-capable cell nodes, adjusting power settings based on this information, and sharing it with other nodes to optimize power allocation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one cell node increases its data communication power to improve downlink performance, then user throughput in that node's coverage area is improved, but network utilization deteriorates due to excessive power consumption and negative impact on adjacent nodes
Solution Approach 1:
The patent implements a feedback mechanism where cell nodes exchange gradient information about the impact of their power settings on adjacent nodes. Each node calculates how its power changes affect neighboring nodes' performance and uses this feedback to adjust its power setting iteratively, achieving network-wide optimization rather than local maximization.
Solution Approach 2:
The patent changes the parameter being optimized from individual node throughput to network-wide utility function. By defining a global utility function that considers all nodes' performance and having each node adjust its power to maximize this collective function, the system achieves better overall network utilization while reducing excessive power consumption.
2Productivity
If one cell node increases its data communication power to improve downlink performance, then user throughput in that node's coverage area is improved, but network utilization deteriorates due to interference with adjacent nodes
Solution Approach 1:
The patent implements a feedback mechanism where cell nodes exchange gradient information about the impact of their power settings on adjacent nodes. Each node calculates how its power changes affect neighboring nodes' performance and uses this feedback to adjust its power setting iteratively, achieving network-wide optimization rather than local maximization.
Solution Approach 2:
The patent applies preliminary anti-action by having each node consider the negative impact its power increase would have on adjacent nodes before actually increasing power. The gradient information calculation predicts the harmful effect on neighbors, and this prediction is used to prevent excessive power increases that would cause interference, thus counteracting the harmful effect before it occurs.
3Productivity
If cell nodes set power independently to maximize local performance, then individual node throughput is improved, but overall network utilization deteriorates due to lack of coordination
Solution Approach 1:
The patent changes the parameter being optimized from individual node throughput to network-wide utility function. By defining a global utility function that considers all nodes' performance and having each node adjust its power to maximize this collective function, the system achieves better overall network utilization while reducing excessive power consumption.
Solution Approach 2:
The patent segments the complex network-wide optimization problem into individual node decisions. Each node independently calculates its own gradient information based on local measurements and exchanges only essential coordination data with neighbors, rather than requiring centralized control of all nodes. This segmentation maintains simplicity while achieving coordinated optimization.
Data Source
AI summary
An apparatus, computer program, and method are provided for setting a power of a cell node based on cell node gradient information. Cell node gradient information is generated based on a multiple-codeword channel quality indicator (CQI), utilizing a multiple-input-multiple-output (MIMO)-capable cell node in a network configured for communicating with a plurality of MIMO-capable user equipment. Additionally, other cell node gradient information is received that is generated for a plurality of other MIMO-capable cell nodes. The generated cell node gradient information and the other cell node gradient information are processed. Further, a power of the MIMO-capable cell node is set, based on the processing.