Home Base Station Interference Reduction via Carrier Segmentation
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Solution Overview
Problem
The installation of home base stations by users can lead to arbitrary placement, causing inter-base station interference in mobile communication systems, which existing technologies struggle to effectively mitigate, especially with the introduction of carrier aggregation in LTE Advanced.
Innovation Solution
A mobile communication system employing a frequency division duplex scheme that switches user terminals between two cells, each using different uplink and downlink carriers, with the base station controlling handovers and frame configurations to minimize interference through time division sharing of downlink carriers and omitting measurement reports during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If home base stations are arbitrarily installed by users, then ease of deployment is improved, but inter-base station interference increases
Solution Approach 1:
The downlink carrier is segmented into multiple radio frames with different frame configurations. Each radio frame is assigned to a specific cell (first cell or second cell) to avoid simultaneous transmission on the same frequency resource, thereby reducing inter-base station interference while maintaining flexible deployment of home base stations
Solution Approach 2:
The system implements periodic time division sharing of the downlink carrier between first and second cells. By alternating the activation of different radio frames in a periodic manner, the base station reduces interference while allowing arbitrary installation of home base stations
2Productivity
If carrier aggregation is introduced in LTE Advanced, then communication capacity is improved, but inter-base station interference worsens
Solution Approach 1:
The aggregated carriers are segmented with different frame configurations assigned to different cells. This segmentation allows carrier aggregation to increase communication capacity while the different frame configurations prevent interference between aggregated carriers from different base stations
Solution Approach 2:
The system dynamically adjusts frame configurations of aggregated carriers based on traffic situations in each cell. This dynamic adaptation allows the system to maximize communication capacity through carrier aggregation while minimizing inter-base station interference through real-time frame configuration adjustment
3Adaptability or versatility
If downlink carrier is shared between first cell and second cell, then resource utilization is improved, but interference management complexity increases
Solution Approach 1:
The system uses periodic time division sharing with predetermined frame configurations for different cells. This periodic structure simplifies interference management by providing a regular, predictable pattern for carrier sharing between first and second cells, reducing the complexity of coordination while improving resource utilization
Data Source
AI summary
A mobile communication system that employs a frequency division duplex scheme, comprises: one or a plurality of UEs (200) that communicate with a serving cell; and a HeNB (100) that constitutes a first cell and a second cell, wherein the first cell uses a pair of first uplink carrier and downlink carrier for communication, the second cell uses a pair of a second uplink carrier and the downlink carrier for communication, and the HeNB (100) and the UE (200) switch a serving cell of the UE (200) between the first cell and the second cell by a handover procedure.