Dynamic PA Blanking Mode Control for GPS Signal Quality
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Solution Overview
Problem
The existing PA blanking function in mobile phones cannot be configured flexibly to minimize the deterioration of the GPS receiver's CN0 value when both GSM and GPS services are active, leading to degradation of the GPS receiving signal quality due to changing power control levels and timeslots.
Innovation Solution
A method and apparatus that detect the GSM service at preset intervals, acquire the current timeslots and power control level, and consult a two-dimensional table to determine the appropriate PA blanking mode, enabling or disabling it based on the indication information to minimize the CN0 value deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PA blanking function is enabled to control CN0 value deterioration, then GPS signal quality is improved, but when GSM PCL and timeslots change, the CN0 value deterioration increases and GPS signal quality degrades
Solution Approach 1:
The patent implements dynamic adjustment of PA blanking mode based on real-time GSM operating conditions. The system continuously monitors GSM power control level and timeslot information, and dynamically switches between PA blanking enabled/disabled modes according to the monitored parameters, allowing the system to adapt to changing GSM conditions and maintain optimal GPS signal quality
Solution Approach 2:
The patent changes the operational parameters of the PA blanking function by enabling or disabling it based on GSM PCL and timeslot conditions. The system uses a two-dimensional table that maps different combinations of PCL and timeslots to appropriate PA blanking modes, thereby adjusting the system parameters to optimize GPS performance under varying GSM conditions
2Device complexity
If PA blanking function is fixed in enabled or disabled state, then system complexity is reduced, but the ability to minimize CN0 value deterioration is lost
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors GSM power control level and timeslot information, compares these parameters against predefined conditions, and adjusts the PA blanking mode accordingly. This closed-loop feedback system automatically optimizes GPS signal quality by responding to real-time changes in GSM operating conditions
Solution Approach 2:
The patent uses a pre-built two-dimensional table that maps all possible combinations of GSM power control levels and timeslots to appropriate PA blanking modes. This preliminary preparation allows the system to quickly determine the optimal PA blanking configuration without complex real-time calculations, reducing control complexity while maintaining high reliability
Data Source
AI summary
The present invention relates to the field of communications technologies, and discloses a method and an apparatus for setting a working mode of PA blanking, which resolve a problem that, in the prior art, when a GSM is working, because a PA blanking function cannot be configured flexibly to an enabled state or a disabled state, quality of a GPS receiving signal is degraded. When a GPS is running, it is detected, at a preset interval, whether a GSM service is running; when the GSM service is running, a current quantity of timeslots occupied by the GSM service and a current power control level used by the GSM service are acquired; a preset table is searched for indication information of a working mode of PA blanking corresponding to the current quantity of timeslots and the current power control level; it is determined whether the indication information is consistent with a current working mode of the PA blanking; and the current working mode is set, when the indication information is not consistent with the current working mode of the PA blanking, to a working mode corresponding to the indication information. Embodiments of the present invention are applied to a process of PA blanking processing.