MBS Discontinuous Reception with Timers for Lower UE Power Use
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Solution Overview
Problem
Existing wireless communication technologies lack effective mechanisms for power-efficient multicast and broadcast service (MBS) reception, particularly in 5G new radio (NR), where hybrid automatic repeat request (HARQ) feedback and point-to-point (PTP) retransmissions occur, leading to high power consumption.
Innovation Solution
Implementing Discontinuous Reception (DRX) mechanisms for MBS, configured with timers and timers offsets, to manage power consumption by controlling UE activity during data receptions and transmissions, including on-duration, inactivity, and HARQ retransmission timers for both point-to-multi-point (PTM) and point-to-point (PTP) transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous reception monitoring is implemented for MBS with HARQ feedback and PTP retransmission, then service reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements Discontinuous Reception (DRX) mechanism that periodically switches the UE between active monitoring states and sleep states. The DRX cycle includes an on-duration timer during which the UE monitors PDCCH for MBS assignments, followed by a sleep period where monitoring is suspended. This periodic action maintains service reliability during active periods while significantly reducing power consumption during sleep periods, directly resolving the contradiction between continuous monitoring reliability and power efficiency.
Solution Approach 2:
The patent introduces dynamic timer mechanisms (on-duration timer, inactivity timer, HARQ RTT timer, retransmission timer) that adaptively control the UE's reception behavior. These timers dynamically adjust the monitoring duration and sleep periods based on actual traffic conditions and HARQ feedback status. The dynamic adjustment allows the system to maintain reliability when needed while maximizing power savings during low-activity periods, resolving the static contradiction between continuous monitoring and power saving.
2Use of energy by moving object
If DRX is applied to MBS with PTP retransmission, then power saving is improved, but service complexity increases
Solution Approach 1:
The patent segments the DRX operation into distinct functional components: on-duration timer for initial monitoring, inactivity timer for extending monitoring during data activity, HARQ RTT timer for coordinating retransmission timing, and retransmission timer for monitoring retransmission opportunities. Each timer handles a specific aspect of the DRX-MBS operation, making the complex service manageable through modular segmentation while maintaining power saving benefits.
Solution Approach 2:
The patent implements feedback mechanisms through HARQ acknowledgments and network-controlled timer adjustments. The UE provides HARQ feedback during active periods, and the network uses this feedback to control retransmission timing and adjust DRX parameters. This feedback loop enables the complex PTP retransmission service to operate efficiently within the DRX framework, balancing power saving with service complexity through intelligent coordination.
3Use of energy by moving object
If multiple timers are configured for DRX in MBS, then power management efficiency is improved, but configuration complexity increases
Solution Approach 1:
The patent makes the DRX mechanism universal for MBS by designing the timer configuration to handle multiple functions: on-duration timer manages both initial monitoring and retransmission monitoring, inactivity timer handles both data activity detection and HARQ feedback timing, and retransmission timers serve both PTM and PTP scenarios. This multi-functionality allows a single standardized DRX configuration framework to efficiently manage power across diverse MBS service types, improving power management efficiency while minimizing configuration complexity through reuse.
Data Source
AI summary
A wireless communication method for use in a wireless terminal is disclosed. The method comprises receiving, from a wireless network node, configuration information associated with a discontinuous reception, DRX, for a multicast broadcast service, MBS, and performing the DRX configured based on the configuration information for the MBS.