Interference Mitigating Cellular Network Frequency Band Switching
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Solution Overview
Problem
Wireless communication networks face interference issues due to transmissions from neighboring base stations and other wireless RF transmitters, which degrade network performance and lead to cell coverage dropout, especially with increased UE usage and demand for capacity.
Innovation Solution
Implementing an interference mitigation system where a base station obtains physical channel information to identify interference and switches user equipment (UE) to a different frequency band, such as from LTE band 13 to LTE band 4, to minimize interference and maintain network stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmissions are increased to support more UEs and higher data applications, then network capacity and service capability are improved, but interference from neighboring base stations and other RF transmitters increases, degrading network performance
Solution Approach 1:
The system dynamically changes the frequency band parameter by switching from a first frequency band to a second frequency band when interference is detected. This parameter change allows the network to maintain high capacity operations while avoiding interference-degraded frequency bands, thus resolving the contradiction between network capacity and interference levels
2Device complexity
If the base station operates on a single frequency band to simplify operations, then device complexity is reduced, but cell coverage dropout occurs when interference is present on that frequency band
Solution Approach 1:
The system implements dynamic frequency band switching capability, allowing the base station to transition between a first frequency band and a second frequency band based on interference conditions. This dynamic approach maintains reliability by ensuring continuous coverage through band switching while managing complexity through automated interference detection and switching control
3Reliability
If the base station switches frequency bands rapidly to avoid interference, then network performance is maintained, but service disruption and user experience degradation occur during switching transitions
Solution Approach 1:
The system performs preliminary interference detection and assessment before initiating frequency band switching. By detecting interference conditions in advance and evaluating the need for switching, the system minimizes unnecessary band transitions and reduces service disruption time, thereby maintaining network performance while reducing loss of time during switching operations
Data Source
AI summary
Interference mitigation methods and systems are provided. A base station obtains physical channel information of a transmission signaled in a first frequency band between the base station and at least one user equipment (UE) associated with the base station. The transmission corresponds to at least one of an uplink communication or a downlink communication. An interference mitigation controller compares the obtained physical channel information to a predetermined interference condition, to identify a presence of interference in the transmission. A second frequency band different from the first frequency band is selected, responsive to the identified presence of interference. The base station sends an instruction to the at least one UE associated with the base station to signal using the selected second frequency band. At least one of the first frequency band and the second frequency band includes a Long Term Evolution (LTE) band.