Modulated Preamble for Low Power Wireless Operations
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Solution Overview
Problem
Wireless communication devices face high power consumption when continuously monitoring downlink channels for messages, even if not scheduled to receive any, leading to excessive battery drain and reduced processing efficiency.
Innovation Solution
The implementation of a modulated preamble technique, where user equipment (UE) receives a modulated preamble indicating whether it is scheduled to receive downlink messages, allowing it to enter a sleep mode if not scheduled, thereby reducing power consumption and improving processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors the downlink channel for messages, then the UE can detect scheduled messages in real time, but the power consumption increases excessively
Solution Approach 1:
The UE transitions from continuous monitoring to periodic monitoring by utilizing DRX cycles. During each DRX cycle, the UE wakes up at specific monitoring occasions to check for messages and enters sleep mode during non-monitoring periods. This periodic action maintains message detection capability while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The network transmits a wake-up signal (WUS) or go-to-sleep signal before the actual downlink message transmission. This preliminary action allows the UE to determine in advance whether it needs to wake up for message reception or can remain in sleep mode, optimizing power consumption while ensuring reliable message detection when scheduled.
2Use of energy by moving object
If the UE enters sleep mode to reduce power consumption, then the power efficiency improves, but the UE cannot detect messages in real time
Solution Approach 1:
The network provides feedback through wake-up signals or go-to-sleep signals that inform the UE whether it should remain active or enter sleep mode. This feedback mechanism ensures that the UE maintains message detection capability when needed while entering sleep mode when no messages are scheduled, thus improving power efficiency without sacrificing reliability.
Solution Approach 2:
The UE dynamically transitions between active and sleep states based on network indications and message scheduling requirements. This dynamic operation allows the UE to adapt its power consumption level to actual communication needs, maintaining reliability when messages are present while maximizing power efficiency when the channel is idle.
3Use of energy by moving object
If the UE processes the modulated preamble during the initial symbol duration, then the power consumption is reduced by enabling sleep mode, but the processing time is constrained
Solution Approach 1:
The UE performs partial processing of the modulated preamble during the initial symbol duration to determine whether to enter sleep mode. Rather than completing full message decoding, the UE processes only the essential wake-up signal or go-to-sleep indication, which consumes minimal time and enables quick transition to sleep mode when appropriate, thus reducing power consumption with acceptable processing time.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive control signaling indicating a preamble configuration. The UE may receive a preamble in a time domain. The preamble may include a set of modulated bits during a first portion of an initial symbol duration of a slot. The set of modulated bits may include one or more of a first subset of network temporary identifier bits or a second subset of modulation and coding scheme (MCS) bits. The UE may process the preamble during a second portion of the initial symbol duration of the slot based on the preamble configuration.