Transparent Coordinated Beam-Forming for Inter-Cell Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in implementing coordinated beam-forming, especially in FDD systems, due to the lack of DL CoMP feedback and the need for RF calibration, which is costly and difficult to implement, and results in high transmit power disparities and interference.
Innovation Solution
A system and method for transparent coordinated beam-forming that determines correlations between communications devices, adjusts transmission based on orthogonality values, and shares information between neighboring controllers to reduce inter-cell interference without requiring eNB RF calibration, allowing for its use in both FDD and TDD systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RF calibration is performed to enable coordinated beam-forming, then beam-forming accuracy is improved, but system cost and complexity increase significantly
Solution Approach 1:
The patent introduces a coordination entity that acts as an intermediary between eNBs, collecting channel state information and computing coordinated beam-forming weights centrally. This eliminates the need for complex distributed RF calibration while achieving effective coordinated beam-forming through centralized processing of channel information.
Solution Approach 2:
The patent replaces the physical RF calibration process with a computational approach using channel state information feedback. Instead of performing actual radio frequency adjustments through calibration hardware, the system uses mathematical computations based on channel measurements to determine optimal beam-forming weights.
2Measurement precision
If RF calibration is performed to enable coordinated beam-forming, then beam-forming accuracy is improved, but implementation difficulty increases
Solution Approach 1:
The coordination entity serves as a centralized intermediary that simplifies implementation by handling all computational complexity in one location. Individual eNBs only need to feed back channel information without performing complex calibration procedures, making the system easier to implement in existing networks.
Solution Approach 2:
The system uses existing uplink channel measurements and feedback mechanisms that are already part of the LTE standard. The coordination entity self-configures by collecting available channel state information from UEs and eNBs, eliminating the need for separate calibration procedures.
3Reliability
If transmit power is increased for coordinated beam-forming, then signal quality is improved, but interference to other cells increases
Solution Approach 1:
The patent applies different transmit power levels to different spatial directions and different eNBs based on local channel conditions. The coordination entity computes cell-specific and UE-specific power adjustment factors based on channel state information, allowing each eNB to optimize its transmit power locally while considering the impact on neighboring cells.
Solution Approach 2:
The system dynamically adjusts transmit power parameters based on channel conditions and coordination calculations. The coordination entity computes power adjustment factors that modify the transmit power of coordinated eNBs, changing the power parameter adaptively to maintain signal quality while reducing interference to cell-edge users in neighboring cells.
4Reliability
If channel state information is collected from all UEs for coordinated beam-forming, then beam-forming performance is improved, but feedback overhead increases
Solution Approach 1:
The patent extracts only the essential channel state information needed for coordinated beam-forming from the complete CSI available at each UE. The system collects specific parameters such as channel matrices or simplified channel quality indicators rather than full CSI, reducing feedback overhead while maintaining sufficient information for effective coordination.
Solution Approach 2:
The system collects partial channel state information from UEs - specifically the minimum necessary data to compute coordinated beam-forming weights. This partial information approach avoids the excessive overhead of collecting complete CSI while providing sufficient data for the coordination entity to perform effective beam-forming optimization.
Data Source
AI summary
A system and method for transparent coordinated beam-forming are provided. A method for transmitting information includes determining correlations between communications devices served by a communications controller and communications devices served by neighboring communications controllers, selecting a communications device from the communications devices served by the communications controller, adjusting a manner of transmission of a transmission containing information to the selected communications device based on a correlation for the selected communications device, and transmitting the transmission to the selected communications device.