Inter-frequency Measurement Decision Logic for Wireless Receivers
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Solution Overview
Problem
In radio communication systems, particularly in mobile networks like UMTS, performing inter-frequency measurements between different radio frequency ranges is complex and often unnecessary, leading to increased battery consumption and interference, as well as vain attempts at measurement due to location outside the target frequency range.
Innovation Solution
A method where a receiver determines the received level of a signal at a first radio frequency and uses this information to decide whether to perform measurements on a second signal at a different radio frequency, optimizing the decision based on the received level and threshold values, thereby minimizing unnecessary inter-frequency measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver performs measurements on signals at a second radio frequency range, then the receiver can prepare for frequency changes and improve communication reliability, but the device complexity and battery consumption increase
Solution Approach 1:
The network node performs preliminary measurements on the second frequency range and stores measurement results (such as received signal levels) in advance. When the receiver needs to evaluate whether to switch frequencies, it retrieves these pre-stored results instead of performing new measurements, thereby reducing the complexity and resource consumption of the measurement process while maintaining reliable frequency selection
Solution Approach 2:
The measurement results obtained at the network node are copied and provided to the receiver. Instead of the receiver performing its own measurements, it uses the copied measurement data from the network node, which significantly reduces the measurement complexity and battery consumption at the receiver while still enabling reliable frequency change decisions
2Adaptability or versatility
If the receiver performs inter-frequency measurements, then the receiver can evaluate frequency change opportunities, but battery power is consumed and interference increases
Solution Approach 1:
The measurement function is extracted from the receiver and relocated to the network node. The network node performs the measurements and provides the results to the receiver, which eliminates the need for the receiver to perform its own measurements. This extraction of the measurement function from the mobile receiver reduces battery consumption while maintaining the ability to evaluate frequency change opportunities
Solution Approach 2:
The network node performs measurements on its own infrastructure signals and makes them available to receivers. The measurement service is provided by the network itself rather than requiring each receiver to perform self-measurements, reducing individual receiver energy consumption while maintaining frequency evaluation capability
3Reliability
If the receiver performs measurements outside the relevant radio cell, then the receiver may miss potential frequency changes, but unnecessary measurements increase interference and waste resources
Solution Approach 1:
The network node performs preliminary measurements and determines which receivers are likely candidates for frequency changes based on their locations and signal conditions. Only receivers identified as potential candidates receive measurement results for the second frequency range, preventing unnecessary measurements by receivers that are not in relevant radio cells and thus reducing interference
Solution Approach 2:
Instead of providing measurement results for all frequency ranges to all receivers, the network node selectively provides measurement results only for those frequency ranges and receivers where frequency changes are actually beneficial. This partial action approach avoids unnecessary measurements and reduces interference while maintaining accurate frequency change detection for relevant cases
Data Source
AI summary
In a method for wireless communication, a receiver receives a first signal at a first radio frequency and determines the reception level of the first signal. The receiver receives data during a reception level of the first signal at the first radio frequency. The receiver decides, based on the determined reception level, whether at least one measurement is to be taken on a second signal transmitted at a second radio frequency. A radio station carries out the method.