Baseband Modem Power Modes for DRX Energy Savings
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Solution Overview
Problem
Current wireless communication technologies, such as LTE, consume high power due to complex architectures and lack use-case-specific power-saving mechanisms, particularly for low-data-rate applications, leading to reduced battery life in user equipment (UE) devices.
Innovation Solution
A baseband modem with multiple operational modes (high-power, low-power, and sleep modes) is implemented, utilizing distinct processors and processing circuitry for each mode, and transitioning between them based on communication activity and timer expiration to conserve power during discontinuous reception (DRX) operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single processor is used to perform all baseband processing functions, then device complexity is reduced, but power consumption increases and battery life decreases
Solution Approach 1:
The baseband processing functions are segmented into multiple independent processor cores (first processor, second processor, third processor) that can operate independently. Each processor handles specific protocol stack layers or processing tasks, allowing selective activation based on communication requirements. This segmentation enables the system to activate only necessary processors during DRX off periods, reducing overall power consumption while maintaining full functionality when needed.
2Productivity
If multiple processor cores are used to handle different LTE activities, then processing capability and productivity are improved, but device complexity and power consumption increase
Solution Approach 1:
The system implements dynamic processor activation where the third processor is selectively activated or deactivated based on communication activity detection. During DRX off periods with no detected activity, the third processor remains deactivated to save power. When activity is detected, it is activated to handle the processing load. This dynamic approach allows multiple processors to work together when needed while reducing complexity and power consumption during idle periods.
3Use of energy by moving object
If the processor is activated during DRX on period and deactivated during DRX off period, then power consumption is reduced, but delay increases between requests and responses
Solution Approach 1:
The system performs preliminary action by keeping the third processor in a partially ready state during DRX off periods and能够快速激活(quickly activating) it when activity is detected during the transition to DRX on period. This preliminary preparation reduces the activation time compared to a completely deactivated state, thereby reducing delay while still maintaining significant power savings during off periods.
4Device complexity
If existing modem solutions operate in a similar fashion for both low data-rate and high data-rate applications, then device complexity is reduced, but power consumption cannot be optimized for specific use cases
Solution Approach 1:
The system implements local quality by creating use-case-specific processing configurations. The third processor is specially optimized and configured to handle low data-rate applications (such as VoLTE, messaging, web-browsing) with reduced processing power compared to high data-rate applications. This allows the system to activate only the appropriately configured processor for each use case, optimizing power consumption locally for each application type while maintaining overall system simplicity.
Data Source
AI summary
Providing a power-saving mode for control channel monitoring in discontinuous reception (DRX) scenarios. Upon waking from a sleep mode at the conclusion of a DRX off period, a baseband modem may transition to a low-power mode configured to receive and decode only a control channel, such as a physical downlink control channel (PDCCH). If the control channel indicates during a DRX on period that communication traffic will be transmitted to the baseband modem, then the baseband modem may transition to a full-power mode to receive the communication traffic. Otherwise, the baseband modem may transition back to the sleep mode. The low-power mode may be implemented by a dedicated set of hardware configured to draw less power than a full set of hardware configured to implement the high-power mode.