CoMP Mode Selection for Inter-Cell Downlink Interference
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Solution Overview
Problem
Current radio signal transmission systems face challenges in enhancing downlink performance, particularly at cell edges, due to interference and complex backhaul requirements in coordinated multi-point transmission (CoMP) modes, where CoMP CS and CoMP JP have drawbacks such as weaker performance and high complexity.
Innovation Solution
A method that determines inter-cell downlink interference and selects appropriate transmission modes, including single-point and multi-point transmission modes like CoMP CS/CB and CoMP JP/JT, based on channel quality and terminal location, to optimize downlink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordinated multi-point transmission (CoMP) modes are used to improve downlink performance at cell edges, then downlink throughput and coverage are improved, but system complexity and backhaul requirements increase significantly
Solution Approach 1:
The patent applies dynamics by making the transmission mode selectable and adaptable based on channel conditions. The system dynamically switches between single-point transmission and multi-point CoMP modes depending on the wireless terminal's location and channel quality, allowing the system to optimize performance while managing complexity through conditional activation rather than permanent complex configuration.
Solution Approach 2:
The patent applies local quality by providing different transmission modes to different spatial locations. Cell-edge terminals receive multi-point CoMP transmission for improved performance, while cell-center terminals use simpler single-point transmission. This spatial differentiation allows the system to improve downlink throughput where needed without unnecessarily increasing complexity system-wide.
2Object-affected harmful factors
If coordinated scheduling/coordinated beamforming (CoMP CS/CB) is used for cell-edge users, then interference is reduced and cell-edge throughput is improved, but performance is weaker compared to joint processing modes
Solution Approach 1:
The patent applies segmentation by dividing the downlink transmission into separate scheduling and beamforming stages in CoMP CS/CB mode. The scheduling decision is made based on channel quality and terminal location, followed by coordinated beamforming to reduce interference. This segmentation allows interference reduction through coordinated beamforming while maintaining manageable complexity, and the system can switch to joint processing when higher throughput is needed.
3Productivity
If joint processing/joint transmission (CoMP JP/JT) is used to achieve high cell-edge throughput, then downlink performance is significantly improved, but backhaul link requirements and system complexity increase
Solution Approach 1:
The patent applies dynamics by making CoMP JP/JT mode selectable based on channel conditions and terminal location rather than permanently deployed. The system dynamically activates joint processing modes when cell-edge terminals require high throughput, and switches to simpler modes when conditions permit, thereby achieving high cell-edge throughput when needed while reducing backhaul requirements through conditional deactivation.
Solution Approach 2:
The patent applies local quality by providing joint processing transmission selectively to cell-edge terminals that require it, rather than applying it system-wide. This allows the system to achieve high cell-edge throughput for users who need it while maintaining lower backhaul requirements for cell-center users who can use simpler transmission modes.
4Device complexity
If single-point transmission mode is used for all terminals, then system complexity is minimized, but downlink performance at cell edges deteriorates due to interference
Solution Approach 1:
The patent applies local quality by providing interference-reduced multi-point transmission specifically to cell-edge terminals that suffer from interference, while cell-center terminals continue to use simple single-point transmission. This spatially differentiated approach minimizes system complexity for the majority of users while providing interference mitigation only where and when it is needed.
Solution Approach 2:
The patent applies dynamics by enabling terminals to switch between single-point and multi-point transmission modes based on their location and channel conditions. Cell-edge terminals can dynamically access multi-point CoMP modes when interference becomes problematic, while maintaining the ability to use simpler single-point modes when conditions allow, thereby minimizing overall system complexity while providing interference reduction where needed.
Data Source
AI summary
A cell edge user central based CoMP CS JP mode selection scheme to minimize inter-cell downlink interference. According to the distribution of different types of users adaptive select optimal transmission scheme. After guaranteeing the performance of cell edge user at first, mode selection should be applied to select suitable paired users in order to increase the cell average throughput. Through carefully designing the SINR gaps and level of interference for mode selection, mode selection is a significant solution for the tradeoff between cell edge user throughput and cell average throughput and the tradeoff between performance and complexity.