DRX Sleep Mode Control Using Wake-Up Confirmation in 5G UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in managing discontinuous reception (DRX) operations due to incorrect sleep mode predictions, leading to unnecessary battery consumption and retransmissions in user equipment (UEs).
Innovation Solution
A method and apparatus for controlling DRX operations using sleep mode prediction, involving the transmission of wake-up confirming messages (WCM) and wake-up indication signals (WUS) to accurately determine the UE's sleep mode, thereby reducing unnecessary PDCCH monitoring and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors PDCCH to ensure reliable data reception, then the reliability of data reception is improved, but the battery consumption increases
Solution Approach 1:
The UE switches between wake-up mode and sleep mode periodically based on DRX cycles. During wake-up mode, the UE monitors PDCCH for a limited duration (onDurationTimer). During sleep mode, the UE stops monitoring to conserve battery. This periodic switching resolves the contradiction by ensuring reliable reception during active periods while reducing energy consumption during inactive periods.
Solution Approach 2:
The UE autonomously determines when to wake up and when to sleep based on pre-configured DRX parameters and traffic patterns. The UE uses sleep mode prediction to anticipate upcoming data transmissions and wakes up proactively. This self-service mechanism allows the UE to balance reliability and energy consumption without continuous network control.
2Use of energy by moving object
If the UE enters sleep mode to reduce battery consumption, then the battery efficiency is improved, but the data reception reliability deteriorates due to missed transmissions
Solution Approach 1:
The UE performs sleep mode prediction to anticipate upcoming data transmissions before actually entering sleep mode. Based on predicted traffic patterns and historical data, the UE determines optimal wake-up times in advance. This preliminary action ensures the UE is awake when data is actually transmitted, maintaining reliability while maximizing sleep mode utilization for energy savings.
Solution Approach 2:
The network provides feedback through DCI messages (e.g., WUS - Wake-Up Signal) to indicate whether the UE should wake up or remain in sleep mode. The UE monitors these feedback signals during brief wake-up periods and adjusts its sleep schedule accordingly. This feedback mechanism ensures reliable data reception while optimizing battery efficiency through adaptive sleep scheduling.
3Reliability
If the UE frequently wakes up to monitor PDCCH to ensure no data is missed, then the data reception completeness is improved, but the battery consumption increases
Solution Approach 1:
Instead of continuously monitoring PDCCH, the UE performs partial monitoring during designated wake-up periods (onDurationTimer) within each DRX cycle. The UE monitors for a limited duration that is sufficient to capture expected data transmissions but short enough to conserve energy. This partial action approach ensures data completeness while avoiding excessive battery consumption from continuous monitoring.
4Reliability
If the UE extends the wake-up duration to capture all possible data transmissions, then the data reception reliability is improved, but the battery consumption increases
Solution Approach 1:
The UE dynamically adjusts its wake-up duration and timing based on real-time conditions, including predicted traffic patterns, network feedback signals, and historical data. The onDurationTimer and DRX cycle lengths can be adaptively modified to match actual traffic requirements. This dynamic adjustment ensures reliable data reception when needed while minimizing battery consumption during low-activity periods.
Data Source
AI summary
The disclosure relates to a 5th generation (5G) communication system or a 6th generation (6G) communication system for supporting higher data rates beyond a 4th generation (4G) communication system, such as long term evolution (LTE). A method of a base station (BS) for sleep mode control is provided. The method includes transmitting scheduled downlink (DL) data to a user equipment (UE), detecting one or more consecutive discontinuous transmissions (DTX) at feedback timing corresponding to the DL data, transmitting downlink control information (DCI) including a wake-up confirming message (WCM) to the UE in response to the detection of the consecutive DTX, and determining that the UE is in wake-up mode based on reception of an acknowledgment (ACK) corresponding to the WCM from the UE.