Adaptive Scheduling Request Delay for Low Power Data Communications
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Solution Overview
Problem
Current techniques for reducing power consumption in portable devices during voice and data communications, such as Discontinuous Reception (DRX) schemes, face challenges in balancing power savings with reliable data transmission, particularly when network pre-scheduling is not enabled, leading to premature wake-ups and increased power consumption.
Innovation Solution
The implementation of adaptive scheduling request (SR) delay and packet bundling techniques allows user equipment (UE) to observe network pre-scheduling during the on duration of the CDRX cycle, enabling informed decisions to avoid unnecessary wake-ups and optimize power usage by delaying SR transmissions and bundling data packets based on pre-scheduling status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device enters sleep mode to reduce power consumption, then power consumption is reduced, but the device cannot receive data transmitted by the network
Solution Approach 1:
The device alternates between sleep mode and awake mode in periodic cycles. During awake mode, the device can receive data; during sleep mode, it conserves power. This periodic switching resolves the contradiction by ensuring data reception capability is maintained during awake periods while achieving power savings during sleep periods.
Solution Approach 2:
The network performs pre-scheduling of uplink resources in advance during downlink transmissions. This preliminary action allows the device to know ahead of time when uplink resources will be allocated, enabling it to sleep during these pre-scheduled periods and wake only when necessary, thus resolving the contradiction between power saving and data reception.
2Productivity
If the device wakes up during SR occasion to transmit scheduling request, then data transmission can be initiated, but power consumption increases due to premature wake-ups
Solution Approach 1:
The device monitors downlink assignments and feedback from the network to determine whether to wake up for SR transmission. By using feedback information about network pre-scheduling status, the device can make informed decisions about wake-up timing, avoiding unnecessary wake-ups and reducing power consumption while maintaining data transmission capability.
Solution Approach 2:
The SR transmission timing is made dynamic rather than fixed. The device adapts its wake-up behavior based on real-time network conditions and pre-scheduling status, transitioning from static periodic wake-ups to dynamic condition-based wake-ups, thereby reducing power consumption while maintaining productivity.
3Reliability
If the device frequently wakes up to check for data, then data transmission reliability is improved, but power consumption increases
Solution Approach 1:
The device checks for data at periodic intervals defined by the DRX cycle rather than continuously. This periodic checking maintains data transmission reliability by ensuring the device wakes up at appropriate times to receive data while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The network performs pre-scheduling of data transmissions in advance, notifying the device of upcoming uplink opportunities. This preliminary action allows the device to sleep through periods when no data transmission is needed and wake only when data is scheduled to be transmitted, maintaining reliability while reducing power consumption.
Data Source
AI summary
Techniques for low power voice communications include determining a time between an arrival of data for uplink transmission by a device and a scheduling request (SR) occasion, the SR occasion occurring after the arrival of the data and within an on duration of a discontinuous reception (DRX) cycle, and delaying transmission of a SR by the device during a time period that begins at the arrival of the data for uplink transmission and continues for the determined time.