Multicast Wake-Up Signal for C-DRX Power Optimization
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in power management during multicast or broadcast discontinuous reception (DRX) cycles, as UEs are unable to receive wake-up signals (WUS) for multicast or broadcast purposes, leading to reduced power savings.
Innovation Solution
The implementation of a multicast or broadcast WUS format that allows UEs to receive wake-up signals during WUS monitoring occasions of a C-DRX cycle, enabling them to determine if upcoming transmissions are scheduled, thereby deciding whether to wake up or enter sleep mode, thus optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs continuously monitor for multicast or broadcast transmissions during C-DRX active durations, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by introducing a wake-up signal that is transmitted before the C-DRX active duration. This wake-up signal preliminarily indicates whether multicast or broadcast transmissions are scheduled, allowing the UE to make an informed decision about whether to wake up for the active duration. If no transmission is scheduled, the UE remains in sleep mode, avoiding unnecessary power consumption while maintaining reliability when transmissions are actually scheduled.
2Reliability
If UEs wake up for every C-DRX active duration to check for transmissions, then transmission detection reliability is improved, but power savings are reduced
Solution Approach 1:
The patent extracts the transmission scheduling information from the regular C-DRX active duration monitoring and places it in a separate wake-up signal transmitted beforehand. This allows the UE to extract only the necessary information (whether a transmission is scheduled) without having to fully activate and monitor all transmission channels during the active duration, thereby reducing power consumption while maintaining detection reliability.
3Loss of energy
If UEs monitor for wake-up signals during WUS monitoring occasions, then power savings are improved by avoiding unnecessary wake-ups, but transmission notification capability is worsened without multicast/broadcast WUS support
Solution Approach 1:
The patent applies universality by creating a multicast or broadcast wake-up signal that serves multiple functions: it notifies UEs of upcoming multicast or broadcast transmissions, maintains compatibility with the existing WUS monitoring occasion framework, and enables power savings while providing group-based transmission notifications. This multi-functional approach enhances adaptability without sacrificing power efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling from a base station that indicates a multicast or broadcast wake up signal (WUS) format. The UE may receive a multicast or broadcast WUS from the base station during a WUS monitoring occasion of a connected mode discontinuous reception (C-DRX) cycle in accordance with the control signaling. The multicast or broadcast WUS may indicate upcoming transmissions for a set of multicast or broadcast services (MBSs). If, for example, the UE is subscribed to a first MBS from the set of MBSs and the multicast or broadcast WUS indicates an upcoming transmission for the first MBS, the UE may monitor for the upcoming transmission during an active duration of the C-DRX cycle. Otherwise, the UE may enter a sleep mode to conserve power.