Antenna Gain Offset for Cell Selection Accuracy
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Solution Overview
Problem
Current cell selection processes in wireless communication systems, such as those in UMTS and LTE, do not effectively account for antenna gain variations, leading to suboptimal cell selection and increased call failures, especially in border scenarios where high gain antennas may prioritize distant base stations over nearby ones, resulting in weak uplink signals and repeated call failures.
Innovation Solution
The method involves determining the antenna gain of a user equipment (UE) and applying an antenna gain-dependent offset to the power threshold for cell selection criteria, allowing for more accurate evaluation of suitable cells and reducing call failures by prioritizing cells with stronger downlink signals and ensuring successful uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high gain antenna is used to extend coverage range, then the coverage area is improved, but the cell selection accuracy deteriorates due to prioritizing distant base stations over nearby ones
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the S_offset parameter based on antenna gain characteristics. For high gain antennas, a larger offset is applied to the power threshold, effectively lowering the selection criterion to prevent distant cells from being incorrectly selected. This parameter adjustment resolves the contradiction by maintaining coverage extension while improving cell selection accuracy.
Solution Approach 2:
The patent implements local quality by applying different offset values to the power threshold depending on the specific antenna gain characteristics of the user equipment. Instead of a uniform approach, the system tailors the cell selection criterion to the local condition of antenna performance, ensuring optimal selection accuracy for each device type.
2Device complexity
If standard power threshold is used for cell selection, then the selection process is simple, but call failure rate increases in border scenarios
Solution Approach 1:
The patent modifies the power threshold parameter by adding an antenna gain-dependent offset (S_offset). This dynamic parameter adjustment maintains the simplicity of the threshold comparison mechanism while significantly improving reliability in border scenarios by preventing selection of distant cells with weak uplink potential.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and applying the S_offset value based on antenna gain before the actual cell selection decision. This advance adjustment ensures that the power threshold is already optimized for the specific device, preventing call failures before they occur rather than correcting them afterward.
3Area of stationary object
If distant cells are selected based on strong downlink signals, then coverage is extended, but uplink signal quality deteriorates
Solution Approach 1:
The patent changes the power threshold parameter by incorporating an offset based on antenna gain characteristics. This adjustment creates a more balanced selection criterion that accounts for both downlink signal strength and uplink potential, preventing the selection of distant cells that would have poor uplink quality despite strong downlink signals.
Solution Approach 2:
The patent introduces S_offset as an intermediary parameter that mediates between downlink signal strength and uplink quality considerations. This offset value, derived from antenna gain characteristics, acts as a balancing factor in the cell selection criterion, ensuring that neither extreme (pure downlink optimization or pure distance-based selection) dominates the decision.
Data Source
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AI summary
In various aspects, the disclosure provides for cell selection including determining a gain of an antenna associated with a user equipment (UE), adding an offset to a threshold to yield a power threshold, wherein the offset is based on the gain of the antenna, selecting a wireless network, obtaining a power measurement associated with a cell within the selected wireless network, and comparing the power measurement with the power threshold to yield a comparison.