Uplink Power Control Target for Distributed Antenna Sectors
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Solution Overview
Problem
In 5G wireless communication systems with distributed antenna systems, setting an optimal uplink power control target (P0) is challenging due to varying receiver sensitivities across different antenna sectors, leading to issues like unnecessary high power output, interference, and reduced access to sectors with higher noise floors.
Innovation Solution
A method in a base station to estimate thermal noise floors across multiple antenna sectors and determine an uplink power control target based on the maximum noise floor level, ensuring sufficient signal-to-noise ratio and minimizing interference by using a combining power component and signal-to-noise ratio offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the uplink power control target is set according to the sector with the highest noise floor, then the UE can achieve sufficient signal-to-noise ratio in that sector, but the UE outputs unnecessarily high power in sectors with lower noise floors, causing interference to neighbor cells and reducing battery lifetime
Solution Approach 1:
The patent applies local quality by determining separate uplink power control targets for different antenna sectors based on their individual noise floor characteristics. Each sector receives a customized P0 value tailored to its specific noise environment, rather than using a uniform cell-level setting. This allows the UE to transmit at appropriate power levels for each sector's conditions, avoiding unnecessary high power output in low-noise sectors while ensuring sufficient signal-to-noise ratio in high-noise sectors.
2Object-generated harmful factors
If the uplink power control target is set according to the sector with the lowest noise floor, then interference is minimized, but the UE cannot achieve sufficient signal-to-noise ratio in sectors with higher noise floors, preventing access to those sectors
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through sector-specific power control targets. Instead of using a single cell-level P0 setting that would either cause interference or prevent access, the system determines individual P0 values for each antenna sector based on their respective noise floor measurements. This enables the UE to achieve sufficient signal-to-noise ratio in high-noise sectors while maintaining appropriate power levels in low-noise sectors.
3Adaptability or versatility
If a combined cell combines macro sectors and small sectors with different receiver sensitivities, then coverage is improved and handovers are eliminated, but the same cell level settings cannot accommodate the varying noise floor levels across different antenna sectors
Solution Approach 1:
The patent applies segmentation by dividing the cell-level power control configuration into sector-specific configurations. Within a combined cell that includes macro and small sectors with different receiver sensitivities, the system determines separate uplink power control targets for each antenna sector based on their individual noise floor characteristics. This segmentation allows the system to maintain the coverage benefits and handover elimination of combined cells while accommodating the varying noise floor levels through customized P0 settings for each sector.
4Ease of operation
If the base station uses a single cell level power control target for all antenna sectors, then configuration is simplified, but the UE experiences performance degradation in sectors with higher noise floors and creates unnecessary interference in sectors with lower noise floors
Solution Approach 1:
The patent resolves this contradiction by applying segmentation to divide the power control configuration into sector-specific components. Instead of using a single cell-level P0 target that degrades performance in high-noise sectors and causes interference in low-noise sectors, the system determines individual P0 values for each antenna sector based on their measured noise floor levels. This segmentation maintains configuration manageability while significantly improving uplink performance and reducing unnecessary interference.
Data Source
AI summary
It is disclosed a base station of a cell having at least a first and a second antenna sector, where the base station is distributed in terms of location and a method performed in said base station for determining an uplink power control target for a UE that is connected to the first antenna sector. The method comprises estimating (42, 504), in the at least the first and the second antenna sectors, a thermal noise floor; and determining (44, 516) the uplink power control target based on a maximum of the estimated thermal noise floors in all of the at least the first and the second antenna sectors. The method improves uplink performance of cells with antenna sectors having different receiver sensitivity, and provides enhanced observability of UEs for cells extending over multiple base stations.