Dynamic Frequency Assignment for RAN Signal Loss
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Solution Overview
Problem
Radio access networks (RAN) experience signal attenuation due to band-pass filters, leading to weaker signal transmission and reception, particularly for devices far from the base station, as filter loss varies with frequency, affecting communication quality and efficiency.
Innovation Solution
The RAN dynamically assigns communication frequencies based on both the distance between the base station and wireless communication devices (WCDs) and the filter loss associated with each frequency, reserving low-loss frequencies for far-distance WCDs and high-loss frequencies for near-distance WCDs to optimize signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a band-pass filter is used in the RAN to filter signals, then signal frequency selection is improved, but filter loss causes weaker signal transmission and reception
Solution Approach 1:
The system dynamically assigns frequencies to WCDs based on their distance from the base station and the filter loss characteristics of different frequencies. This dynamic frequency assignment allows the RAN to adaptively optimize signal strength by selecting appropriate frequencies for different distance scenarios, resolving the contradiction between frequency filtering capability and signal loss.
Solution Approach 2:
The system changes the frequency parameter assigned to different WCDs based on their distance and filter loss characteristics. By varying the frequency parameter dynamically, the system compensates for filter loss effects and maintains optimal signal strength across different communication scenarios.
2Area of stationary object
If high-loss frequencies are used for far-distance WCDs, then communication coverage is improved, but signal strength deteriorates
Solution Approach 1:
The system changes the frequency parameter based on the distance between the base station and WCDs. For far-distance WCDs, the system identifies and assigns frequencies with lower filter loss characteristics, thereby maintaining signal strength while extending communication coverage.
Solution Approach 2:
The system uses feedback regarding distance measurements and filter loss characteristics to make intelligent frequency assignment decisions. This feedback mechanism allows the RAN to continuously optimize frequency selection to maintain signal strength across varying coverage areas.
3Strength
If low-loss frequencies are reserved for far-distance WCDs, then signal strength is improved, but frequency resource allocation complexity increases
Solution Approach 1:
The system implements dynamic frequency assignment that automatically adapts to changing conditions. The base station continuously monitors distance and filter loss characteristics, and dynamically adjusts frequency assignments accordingly. This dynamic approach simplifies resource allocation by using automated decision-making based on measured parameters rather than complex manual planning.
Solution Approach 2:
The system performs self-service by automatically measuring filter loss characteristics and making frequency assignment decisions based on these measurements. The RAN autonomously optimizes frequency allocation without requiring external intervention, reducing the complexity of frequency resource management.
Data Source
AI summary
During a communication session, a filter in the RAN may filter signals sent over the communication pathway. When the filter filters signals sent over communication pathway, it may also cause some filter loss in the signals. The amount of the filter loss may vary as a function of frequency. Before the start of a communication session, the RAN may determine a filter loss for a given frequency. Because a higher filter loss indicates the RAN will transmit (or receive) a weaker signal, it may be undesirable to transmit signals to WCDs that are located a far distance from the RAN with frequencies having high filter losses. Thus, once the RAN has determined a filter loss for a given frequency, the RAN may reserve the given frequency for use in communication between the RAN and at least one WCD based on a distance between the WCD and the RAN.