Indoor DAS Antenna Selection for Small Base Station Interference
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Solution Overview
Problem
The hybrid deployment of indoor Distributed Antenna Systems (DAS) and small base stations experiences significant co-channel interference, which affects system performance, as existing interference coordination methods are not directly applicable to the indoor DAS due to its distributed and multi-antenna-equipped nature.
Innovation Solution
A method for resisting small base station uplink signal interference in indoor DAS through antenna selection, where the system continuously monitors the Signal to Interference Plus Noise Ratio (SINR) and switches to a different antenna with stronger signal power and improved SINR, eliminating the need for complex coordination mechanisms between DAS and small base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hybrid deployment of indoor DAS and small base station is implemented, then signal coverage and data capacity are improved, but co-channel interference increases
Solution Approach 1:
The patent implements dynamic antenna selection where the DAS system continuously monitors SINR values and switches between different antenna units based on real-time interference conditions. This dynamic adaptation allows the system to maintain optimal performance despite the presence of small base stations, resolving the contradiction between achieving hybrid deployment benefits and managing co-channel interference.
Solution Approach 2:
The system changes operational parameters by selecting different antenna units with better SINR characteristics. When interference from small base stations degrades performance on one antenna, the system switches to another antenna unit that experiences less interference, effectively changing the reception parameters to maintain signal quality while coexisting with small base stations.
2Reliability
If interference coordination methods based on small base stations and macro base stations are used, then interference prevention is achieved, but the method is not directly applicable to indoor DAS due to distributed and multi-antenna nature
Solution Approach 1:
The patent creates a universal interference management solution that adapts to the distributed multi-antenna architecture of indoor DAS. By implementing antenna selection based on SINR monitoring, the system achieves interference prevention functionality that is specifically adapted to DAS characteristics, making interference coordination universally applicable across different deployment scenarios including indoor DAS, small base stations, and macro base stations.
3Object-affected harmful factors
If antenna selection based on SINR monitoring is implemented, then interference resistance is improved, but system complexity increases
Solution Approach 1:
The DAS system performs self-service by autonomously monitoring SINR values on different antenna units and automatically switching between them based on interference conditions. The system manages its own interference mitigation without requiring complex external coordination mechanisms, achieving high interference resistance through simple self-monitoring and self-switching operations that minimize overall system complexity.
Data Source
AI summary
The present invention provides a method for resisting small base station uplink signal interference of an indoor DAS based on antenna selection. The method comprises: step 1: determining an initial access RU, and establishing an uplink; step 2: determining, by the access RU of UE 1 on the basis of the level of interference, whether to switch to another RU, and continuously detecting, by the access RU of UE 1 an SINR value at a set time interval, and comparing the SINR with a preset threshold value γ1; wherein if the SINR value is lower than γ1, an MU sets the access RU and each peripheral RU as a candidate RU, and the MU, on the basis of the acquired SINR value of each RU, selects an SINR greater than γ1 and sets the RU having the greatest receiving signal power as the new access RU of UE 1.