Network Node Channel Quality Measurement Exclusion for Signal Leakage
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Solution Overview
Problem
In wireless communication networks using OFDM technology, non-linear power amplifiers cause signal leakage into adjacent frequency bands, leading to inefficient resource allocation and reduced throughput.
Innovation Solution
A method where a network node monitors channel quality and instructs a wireless device to exclude certain Resource Block Groups (RBGs) at the frequency band edges from channel quality measurement reports, thereby reducing signal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If non-linear power amplifiers are used to achieve good efficiency, then power efficiency is improved, but signal leakage into adjacent frequency bands occurs
Solution Approach 1:
The patent segments the frequency spectrum into specific Resource Block Groups (RBGs) that are excluded from channel quality measurements. By identifying and isolating the problematic frequency regions (typically at band edges) where signal leakage occurs, the system prevents wireless devices from reporting channel quality for these specific RBGs, thereby eliminating the harmful effect of spectral regrowth while maintaining efficient power amplifier operation.
Solution Approach 2:
The patent applies local quality by treating different frequency regions differently. Instead of applying a uniform approach across the entire frequency band, the network node identifies specific local regions (RBGs at frequency band edges) where signal leakage is problematic and applies exclusion rules only to those local regions. This allows the power amplifier to operate efficiently across the entire band while locally mitigating the harmful effects at problematic frequencies.
2Measurement precision
If channel quality measurements are taken for all Resource Block Groups, then measurement completeness is improved, but resource allocation efficiency deteriorates due to signal leakage
Solution Approach 1:
The patent extracts and removes the problematic RBGs from the set of RBGs used for channel quality measurements. By taking out the specific Resource Block Groups that are susceptible to signal leakage (typically at frequency band edges) and excluding them from measurement reporting, the system prevents corrupted measurements from affecting resource allocation decisions, thereby improving overall resource allocation efficiency while maintaining measurement precision for the valid RBGs.
Solution Approach 2:
The patent implements a dynamic approach where the set of RBGs used for channel quality measurements is adaptively adjusted based on network conditions and interference characteristics. The network node can dynamically determine which RBGs to exclude from measurements, allowing the measurement set to be optimized in real-time to balance measurement completeness with resource allocation efficiency under varying operational conditions.
3Productivity
If Frequency Selective Scheduling is used to maximize channel gains, then spectral efficiency is improved, but complexity of scheduling increases
Solution Approach 1:
The patent applies preliminary action by pre-identifying and excluding the RBGs that are prone to signal leakage before the scheduling decision-making process. By determining in advance which Resource Block Groups should be excluded from channel quality measurements (typically based on their position at frequency band edges), the system simplifies the subsequent scheduling operations. The network node and wireless devices do not need to perform complex analysis to identify problematic RBGs during scheduling, as this has already been predetermined, thereby reducing scheduling complexity while maintaining spectral efficiency.
Data Source
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AI summary
A network node and a wireless device as well as respective method performed thereby for communication with each other are provided. The method performed by the network node comprises receiving (210), from the wireless device, a measurement report indicating a channel quality of the channel between the network node and the wireless device; and determining (220) whether the channel quality is acceptable or unacceptable. The method further comprises transmitting (240), to the wireless device, an indication of which RBG(s) to report channel quality measurements for, when the channel quality is unacceptable.