RF Switch Coordination for Baseband Processor Wake Periods
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Solution Overview
Problem
Managing the sleep and wake states of wireless integrated circuits in electronic devices with multiple integrated circuits for different communications protocols can lead to resource conflicts, degrading performance if not coordinated properly.
Innovation Solution
The use of radio-frequency power splitters and low noise amplifiers allows asynchronous operation of baseband processors, while coordinated operation is ensured through radio-frequency switches and duplexers, with specific wake periods for each processor to minimize collisions and prioritize voice calls over data sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio-frequency power splitters are used to allow asynchronous operation of baseband processors, then operational independence is improved, but power loss increases due to signal splitting
Solution Approach 1:
Radio-frequency switches are introduced as intermediary components to control signal routing between antennas and baseband processors. The switches act as mediators that can dynamically connect or disconnect signal paths, allowing coordinated operation where only one processor receives the signal at a time, thereby eliminating power loss from continuous splitting while maintaining asynchronous operation capability
Solution Approach 2:
The system transitions from static power splitter architecture to dynamic switch-controlled architecture. The radio-frequency switches can change their state based on operational requirements, dynamically routing signals to the appropriate baseband processor. This dynamic control allows the system to adapt between asynchronous operation modes without the continuous energy loss inherent in passive power splitters
2Loss of energy
If radio-frequency switches are used to enable coordinated operation, then power loss is reduced, but operational complexity increases due to coordination requirements
Solution Approach 1:
A feedback mechanism is implemented where each baseband processor monitors the operational state of the other and communicates this information through the application processor. The system uses feedback signals to indicate when a processor is active or in sleep mode, allowing the switches to be controlled based on real-time operational status. This feedback-based coordination simplifies the control logic compared to complex arbitration schemes
Solution Approach 2:
The baseband processors autonomously manage their own wake periods and operational states without requiring complex external arbitration. Each processor independently determines when it needs to operate and signals this requirement, allowing the system to self-coordinate based on the actual needs of the processors rather than requiring centralized control logic
3Reliability
If wake periods are coordinated to avoid collisions, then resource conflicts are reduced, but time scheduling complexity increases
Solution Approach 1:
The system pre-configures non-overlapping wake periods for different baseband processors based on their operational requirements. By establishing the wake period schedule in advance during system initialization or configuration phase, the complex coordination problem is solved beforehand. The processors simply follow their predetermined wake schedules without requiring real-time negotiation or complex runtime scheduling algorithms
Solution Approach 2:
Each baseband processor operates on a periodic wake schedule rather than requiring continuous coordination. The processors wake up at predetermined intervals to check for signals and then return to sleep mode. This periodic operation pattern naturally reduces conflicts compared to asynchronous random waking, while the regularity of the periods simplifies the scheduling logic compared to arbitrary time slot allocation
Data Source
AI summary
A wireless electronic device having first and second baseband processors is provided. In one suitable arrangement, radio-frequency power splitters and adjustable low noise amplifiers may be form in the receive paths. The use of power splitters allow signals associated with the first and second baseband processors to be received in parallel. In another suitable arrangement, radio-frequency switches are used in place of the power splitters. The states of the switches may be controlled using at least one of the first and second baseband processors. The use of switches instead of power splitters requires that wake periods associated with the first baseband processor and wake periods associated with the second baseband processor are non-overlapping. To ensure minimal wake period collision, a wake period associated with the second baseband processor may be positioned at a midpoint between two successive wake periods associated with the first baseband processor.