DRX HARQ Feedback Timing for Lower UE Power Consumption
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Solution Overview
Problem
Existing wireless communications systems face challenges in efficiently managing power consumption and resource conflicts during discontinuous reception (DRX) mode, particularly with the integration of technologies like preemption, grant-free scheduling, and hybrid automatic repeat request (HARQ), which complicate the DRX function.
Innovation Solution
A method for a terminal device to receive indication information during a timer, allowing it to stop the timer upon receiving HARQ feedback, enter a sleep state, and utilize grant-free scheduling resources to reduce active time and power consumption, while avoiding resource conflicts by timely resource updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal monitors PDCCH in every slot to ensure no downlink data is missed, then downlink data reception reliability is improved, but power consumption increases significantly
Solution Approach 1:
The terminal performs discontinuous reception by monitoring PDCCH only in specific slots determined by a pre-configured monitoring pattern, rather than monitoring every slot. This periodic monitoring approach reduces power consumption while maintaining reliable downlink data reception through mechanisms like downlink feedback indication and retransmission handling.
2Use of energy by moving object
If the terminal enters sleep mode to save power, then power consumption is reduced, but response time to downlink data increases
Solution Approach 1:
The network device sends downlink feedback indication information to the terminal in advance, informing it when downlink data will be transmitted. This feedback mechanism allows the terminal to wake up at the appropriate time to monitor PDCCH, ensuring timely response to downlink data while maintaining discontinuous reception for power savings.
Solution Approach 2:
The network device performs preliminary actions by sending downlink feedback indication information before actual data transmission. This allows the terminal to prepare for upcoming data reception by activating monitoring at the right time, reducing response delay while maintaining power-efficient discontinuous reception mode.
3Loss of time
If the terminal monitors PDCCH in every slot to ensure timely data reception, then response time is reduced, but power consumption increases
Solution Approach 1:
The terminal uses discontinuous reception with periodic PDCCH monitoring based on pre-configured patterns, combined with downlink feedback indication that tells the terminal when to wake up and monitor. This approach maintains fast response time by ensuring the terminal is active when data is sent, while avoiding continuous monitoring to reduce power consumption.
4Use of energy by moving object
If the terminal uses discontinuous reception to save power, then power consumption is reduced, but the complexity of scheduling and coordination increases
Solution Approach 1:
The downlink feedback indication information acts as an intermediary between the network device and terminal, coordinating the discontinuous reception schedule. The network sends this indication in advance to tell the terminal when to wake up and monitor PDCCH, simplifying the coordination complexity by providing a clear signaling mechanism that both parties follow.
Data Source
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AI summary
This application discloses a discontinuous reception communication method and communications apparatus, a communications device, and a communications system. The communications device is configured to: receive, during running of a timer T11, indication information sent by a network device, where the indication information includes HARQ feedback information for initial transmission or retransmission of data of a terminal device, and the timer T11 is started after the initial transmission or the retransmission of the data and is used to monitor a physical downlink control channel PDCCH; and stop the timer T11. Because the timer is stopped immediately when the HARQ feedback information for the data is received, the terminal device is allowed to enter a sleep state. In this way, duration in which the terminal device is in an active state can be shortened, and power consumption can be reduced.