Communication Control Apparatus for Self-Interference Removal in Small Cells
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Solution Overview
Problem
In small-cell base stations, operating radio backhaul and access links in a time division scheme increases latency and memory requirements, and while full-duplex radio communications can improve resource efficiency, self-interference cancellation techniques are insufficient when the power ratio of interference to desired signal is high.
Innovation Solution
A communication control apparatus and method that adjust the power ratio between reception and transmission signals to support self-interference removal when both links operate on the same channel, using a control unit to manage the power ratio and ensure effective self-interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division scheme is used to operate radio backhaul link and access link, then interference between links is avoided, but latency increases and radio resource use efficiency decreases
Solution Approach 1:
The patent applies dynamic switching between time division and full-duplex modes based on real-time interference conditions. The system dynamically adjusts the operation mode of the radio backhaul link and access link, transitioning from static time division to dynamic full-duplex when interference levels allow, thereby optimizing latency while maintaining reliability.
Solution Approach 2:
The patent changes the operational parameters of the radio links by adjusting the power ratio between reception and transmission signals. By modifying this parameter, the system enables full-duplex operation with sufficient signal separation, allowing simultaneous operation of backhaul and access links without excessive interference, thus reducing latency while maintaining reliability.
2Productivity
If full-duplex radio communication is introduced to reduce latency, then radio resource use efficiency improves, but self-interference removal becomes insufficient when power ratio is high
Solution Approach 1:
The patent adjusts the power ratio parameter between reception and transmission signals to optimize the balance between full-duplex performance and self-interference cancellation. By controlling this parameter, the system achieves sufficient signal separation for reliable self-interference removal while maintaining the efficiency benefits of full-duplex operation.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor self-interference levels and adjust the power ratio accordingly. This feedback loop ensures that full-duplex operation maintains reliable self-interference removal by continuously adapting to changing signal conditions, thereby preserving both productivity and reliability.
3Productivity
If self-interference cancellation technique is applied, then full-duplex operation is enabled, but the technique fails when the ratio of interference signal power to desired signal power is not small
Solution Approach 1:
The patent modifies the power ratio parameter to ensure that the interference signal power remains sufficiently smaller than the desired signal power. By controlling this parameter, the system creates conditions where self-interference cancellation techniques can effectively operate, enabling full-duplex mode while maintaining cancellation reliability.
Data Source
AI summary
[Object] To be able to utilize radio resources more efficiently in the environment where a small cell is operated.[Solution] Provided is a communication control apparatus including: a communication unit configured to communicate with a radio communication apparatus being connected to a base station via a radio backhaul link and being connected to one or more terminals via an access link; and a control unit configured to, when a reception on the radio backhaul link and a transmission on the access link, or a reception on the access link and a transmission on the radio backhaul link are executed on an identical channel simultaneously in the radio communication apparatus, adjust a power ratio between a reception signal and a transmission signal in order to support the radio communication apparatus in removing self-interference due to a sneak of the transmission signal from the reception signal.