OFDM Base Station Sector Cooperation for Boundary Terminals
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Solution Overview
Problem
In OFDM cellular radio communication systems, channel quality at sector boundaries and for terminals requiring high priority is compromised, leading to reduced throughput and potential bottlenecks in QoS assurance due to fixed hopping patterns and lack of inter-sector cooperation.
Innovation Solution
The system dynamically adjusts by switching between sector modes, allowing sectors to cooperate using different hopping patterns for terminals at sector boundaries or with high priority, thereby optimizing channel quality and minimizing throughput degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fixed hopping patterns are used for each sector, then interference suppression is achieved, but channel quality deteriorates for terminals at sector boundaries
Solution Approach 1:
The patent applies dynamics by enabling sectors to dynamically switch between independent operation mode and cooperation mode based on terminal location and channel conditions. The hopping pattern assignment is no longer fixed but adapts in real-time, allowing sectors to cooperate by using the same hopping pattern when beneficial, thereby improving channel quality for boundary terminals while maintaining interference suppression through dynamic coordination.
Solution Approach 2:
The patent changes the parameter of hopping pattern assignment from static to dynamic. By allowing sectors to change their hopping pattern selection based on real-time channel quality measurements and terminal positions, the system can optimize the balance between interference suppression and channel quality. The base station adjusts hopping pattern parameters dynamically to resolve the contradiction between fixed pattern benefits and adaptive quality improvement.
2Productivity
If sectors operate independently with different hopping patterns, then system throughput is maintained, but channel quality for boundary terminals deteriorates
Solution Approach 1:
The patent applies merging by allowing sectors to cooperate in transmitting to the same terminal, particularly for terminals at sector boundaries. Instead of strictly independent operation, sectors can combine their resources and use the same hopping pattern to serve boundary terminals, thereby improving channel quality through signal combining while maintaining overall system throughput through coordinated resource allocation.
Solution Approach 2:
The patent applies local quality by differentiating the operation modes of sectors based on local conditions. Interior terminals continue to receive service from their primary sector with dedicated resources, while boundary terminals receive enhanced service through multi-sector cooperation. This localized differentiation allows the system to optimize channel quality for boundary terminals without significantly impacting overall system throughput.
3Object-affected harmful factors
If frequency hopping patterns are switched to avoid overlap, then interference is reduced, but channel quality for high priority terminals is compromised
Solution Approach 1:
The patent applies feedback by implementing a mechanism where the base station monitors channel quality conditions and terminal priorities in real-time. Based on this feedback, the base station dynamically adjusts hopping pattern assignments and sector cooperation decisions. High priority terminals can receive enhanced service by coordinating sector resources, while the feedback loop ensures that interference suppression remains effective through continuous adaptation to changing channel conditions.
Data Source
AI summary
Since the OFDM communication method does not select whether plural sectors use a same terminal as a transmission destination, or always use it as a transmission destination, giving a preference to system throughput deteriorates channel quality of a terminal in a sector boundary, while increasing channel quality in sector boundaries greatly deteriorates system throughput. In a base station, when a sector transmits to a terminal in the front of a beam, only the sector performs the transmission, and when transmission is made to a terminal in a sector boundary off the direction of the beam, a different sector transmits to the same terminal using a same hopping pattern. Thereby, tradeoff between the channel quality of the terminal in a sector boundary and deterioration in system throughput can be minimized.