Radio Base Station DL/UL Configuration Control for Interference Reduction
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Solution Overview
Problem
In LTE-A systems, different DL/UL configurations between neighboring radio base stations can lead to interference between transmitting/receiving points and user terminals, deteriorating communication quality.
Innovation Solution
Each radio base station independently changes and controls the DL/UL configuration in the time domain, dynamically switching to a common configuration with neighboring stations based on interference levels, and reports subframe information through a downlink control channel to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different DL/UL configurations are applied between neighboring radio base stations to optimize local communication needs, then adaptability and resource allocation efficiency are improved, but interference between transmitting/receiving points increases and communication quality deteriorates
Solution Approach 1:
The patent applies local quality by allowing each radio base station to independently select DL/UL configurations suitable for its local communication environment, while introducing a coordination mechanism that considers neighboring stations' configurations. This enables local optimization without causing excessive interference, as each station's configuration choice takes into account the configurations of neighboring stations to maintain regional harmony.
Solution Approach 2:
The patent implements feedback through a coordination mechanism where radio base stations exchange configuration information and adjust their DL/UL configurations based on feedback from neighboring stations. This feedback loop allows the system to detect interference conditions and dynamically adjust configurations to minimize harmful effects while maintaining adaptability.
2Reliability
If DL/UL configuration is fixed across all radio base stations to prevent interference, then communication quality stability is improved, but resource allocation flexibility and spectral efficiency are reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a static, uniform DL/UL configuration approach to a dynamic, adaptive configuration system. Radio base stations can change their DL/UL configurations based on traffic conditions and interference levels, while the coordination mechanism ensures that changes are made in a controlled manner that maintains overall system stability and prevents excessive interference.
Solution Approach 2:
The patent utilizes parameter changes by allowing radio base stations to modify their DL/UL configuration parameters (such as the number of downlink and uplink subframes) based on local conditions. The coordination mechanism monitors these parameter changes and adjusts them to balance the need for spectral efficiency with the need to maintain communication quality stability across the network.
3Productivity
If DL/UL configuration changes frequently to optimize resource allocation, then spectral efficiency and data rates are improved, but system complexity and control overhead increase
Solution Approach 1:
The patent applies preliminary action by establishing a coordination mechanism that pre-defines the rules and procedures for DL/UL configuration changes. This preliminary framework allows radio base stations to make configuration changes more frequently and efficiently, as the decision-making process is guided by pre-established criteria and neighbor station information, reducing the complexity of real-time control decisions.
Data Source
AI summary
A radio communication method for a user terminal performing communication in a cell where DL transmission and UL transmission vary in a time direction is provided. The radio communication method includes receiving downlink control information transmitted in a specific subframe; and analyzing a number and/or positions of subframes to be allocated for the DL transmission among subframes constituting a radio frame based on DL assignment in the downlink control information.