Uplink Spurious Emission Control via Dynamic Power Limiting
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Solution Overview
Problem
In 3GPP LTE systems, spurious emissions from uplink signals interfere with neighboring frequency bands, particularly when carriers are close, leading to interference issues that existing technologies struggle to fully mitigate.
Innovation Solution
A method and user equipment are developed to minimize spurious emissions by limiting the maximum transmission power and using carrier aggregation techniques, such as multi-cluster transmission and additional maximum power reduction, to reduce interference with neighboring channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If maximum transmission power is increased to improve signal coverage and transmission quality, then uplink signal strength is improved, but spurious emissions to neighboring bands increase causing interference
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the maximum transmission power based on the uplink carrier frequency. Different frequency ranges are assigned different maximum power levels to optimize the trade-off between signal strength and spurious emission control. The base station configures specific maximum power values for different uplink carrier frequencies, allowing the system to adapt transmission parameters to frequency-specific characteristics and minimize interference to neighboring bands while maintaining adequate signal coverage.
2Productivity
If carrier aggregation with multiple clusters is used to increase data throughput, then productivity is improved, but spurious emissions and interference with neighboring channels increase
Solution Approach 1:
The patent applies local quality by implementing frequency-specific power control for different carrier clusters in a carrier aggregation scenario. Each uplink carrier cluster is evaluated individually, and the maximum transmission power is determined based on the specific frequency range of each cluster. This allows the system to maintain high data throughput through multiple clusters while applying localized power adjustments to each cluster to minimize spurious emissions to neighboring bands, rather than applying a uniform power limit across all aggregated carriers.
Data Source
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AI summary
There is provided a method for limiting a spurious emission, the method performed by a user equipment (UE). The method may comprise: if a radio frequency (RF) unit of the UE is configured to use a 3GPP standard based E-UTRA band 1, configuring a RF unit of the UE to limit a maximum level of spurious emission to -50dBm for protecting other UE using a 3GPP standard based E-UTRA band 5 in order to apply a UE-to-UE coexistence requirement for the same region to inter-regions; if the RF unit is configured to use the 3GPP standard based E-UTRA band 5, configuring the RF unit of the UE to limit a maximum level of spurious emission to -50dBm for protecting other UE using at least one of the 3GPP standard based E-UTRA bands 1, 3, 7, 8, 38, 40 in order to apply a UE-to-UE coexistence requirement for the same region to inter-regions; and transmitting an uplink signal through the configured RF unit.