Uplink Power Control via A-MPR for Interference Mitigation
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Solution Overview
Problem
In 3GPP LTE wireless communication systems, there is a challenge in minimizing interference between adjacent base stations using different frequency bands, particularly in the frequency range of 1980 MHz to 2010 MHz, where coexistence requirements for uplink transmission power need to be managed to prevent spurious emission and ensure efficient use of bandwidth.
Innovation Solution
A method is introduced where user equipment (UE) and base stations employ an additional maximum power reduction (A-MPR) value, specifically 15 dB for a 5 MHz bandwidth and 11 dB for a 10 MHz bandwidth, to limit uplink transmission power and mitigate interference, especially when operating in the 1980 MHz to 2010 MHz frequency range, ensuring coexistence with adjacent UEs using different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmission power is increased to improve communication quality, then signal strength is improved, but interference to adjacent frequency bands increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the uplink transmission power level based on the operating frequency band. Specifically, when the UE operates in the 1980-2010 MHz band, an additional maximum power reduction (A-MPR) parameter is applied to limit the transmission power, thereby reducing interference to adjacent bands while maintaining adequate communication quality through optimized power control
2Productivity
If transmission bandwidth is increased to improve data rate, then productivity is improved, but spurious emission increases
Solution Approach 1:
The patent implements parameter changes by establishing a relationship between transmission bandwidth and maximum power reduction. When the transmission bandwidth is 5 MHz, an A-MPR of 15 dB is applied; when the bandwidth is 10 MHz, an A-MPR of 11 dB is applied. This dynamic parameter adjustment allows the system to optimize data rate while controlling spurious emission within acceptable limits
3Adaptability or versatility
If frequency bands are allocated adjacently to different service providers, then adaptability is improved, but interference between providers increases
Solution Approach 1:
The patent applies local quality by implementing band-specific power control parameters. Different A-MPR values are assigned to different frequency bands and bandwidth configurations, allowing each service provider to operate adaptively in their allocated band while locally optimizing power levels to minimize interference to adjacent bands used by other providers
Data Source
AI summary
A method, performed by a user equipment (UE), is provided for determining uplink transmission power. A radio frequency (RF) unit is configured to use for an uplink transmission a frequency range of 1980 MHz through 2010 MHz or 1920 MHz through 2010 MHz. The UE receives a value of an additional maximum power reduction (A-MPR) from a serving base station (BS) adjacent to a neighboring BS for serving another UE using for an uplink transmission a frequency range of 2010 MHz through 2025 MHz. An uplink signal is transmitted at an uplink transmission power calculated by using the value of the A-MPR. The value of the A-MPR is 11 dB or 15 dB.