Mobile Receiver On-Time Adjustment for Paging Channel Power Savings
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Solution Overview
Problem
Mobile communication devices face challenges in reducing power consumption during standby mode, as they need to periodically monitor for incoming calls and signals, even when there is no useful information, due to the need for channel estimation in varying signal conditions.
Innovation Solution
The solution involves measuring fading across subchannels by computing cross correlations of concurrent pilot symbols to determine if the receiver can be shut off before the end of the receive time slot, allowing for reduced receiver on-time based on channel synchronization and fading conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver continues to receive additional pilot symbols beyond the slot descriptor block to perform channel estimation, then channel estimation accuracy is improved, but power consumption increases
Solution Approach 1:
The receiver on-time is made dynamic rather than fixed. The mobile communication device adjusts the receiver on-time based on measured fading conditions across subchannels. When fading is low, the receiver is shut off earlier to save power; when fading is high, the receiver remains on longer to maintain channel estimation accuracy, thus adapting to varying channel conditions optimally
Solution Approach 2:
The invention changes the parameter of receiver on-time based on fading measurements. By measuring fading across subchannels and using these measurements to determine an appropriate receiver on-time, the system optimizes the balance between power consumption and channel estimation accuracy under different signal conditions
2Use of energy by moving object
If the receiver is shut off early to reduce power consumption, then power consumption is reduced, but channel estimation accuracy deteriorates
Solution Approach 1:
The system dynamically adjusts receiver on-time based on real-time fading measurements. Rather than using a fixed receiver on-time, the device measures fading conditions and adapts the receiver operation accordingly, shutting off when conditions permit and extending operation when needed to maintain accuracy
Solution Approach 2:
The invention implements feedback by measuring fading across subchannels and using these measurements to control receiver operation. The fading measurements provide feedback that informs the decision of when to shut off the receiver, creating a closed-loop system that balances power savings with estimation accuracy
3Reliability
If the receiver remains on throughout the time slot to receive all pilot symbols, then channel estimation is maintained, but battery life decreases
Solution Approach 1:
The receiver on-time is dynamically adjusted based on fading conditions. When fading is low, the receiver is shut off earlier, extending battery life; when fading is high, the receiver remains on longer to maintain reliability, thus adapting to varying conditions to optimize both battery life and reliability
Solution Approach 2:
The system changes the receiver on-time parameter based on measured fading conditions. By using fading measurements to determine an appropriate receiver on-time, the system optimizes the balance between maintaining channel estimation reliability and conserving battery life under different signal conditions
Data Source
AI summary
A mobile communication device (100) includes a receiver (102) which is normally shut off when the mobile communication device is idle. Upon the arrival of a paging time slot to which the mobile communication device is assigned, the mobile communication device turns on the receiver and begins receiving a composite signal including frequency diverse subchannels. The mobile communication device measures the delay spread of the subchannels (406). The receiver then adjusts the receiver on time for the next time slot based on the delay spread of the present time slot.