Wireless Paging Wake-Up Signal and Preamble Synchronization
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Solution Overview
Problem
Future wireless communications networks face challenges in efficiently supporting a wide range of devices with different data traffic profiles, particularly in maintaining synchronization and reducing power consumption for devices with long inactivity periods, leading to increased energy consumption and potential false alarms.
Innovation Solution
The method involves transmitting a preamble signal by infrastructure equipment to communications devices when synchronization is needed due to long inactivity, and using a wake-up signal (WUS) prior to paging occasions to indicate the presence of downlink messages, thereby reducing unnecessary monitoring and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices wake up frequently to check for downlink messages, then message delivery reliability is improved, but power consumption increases
Solution Approach 1:
The network transmits a wake-up signal in advance of the paging occasion to indicate whether downlink messages are present. This preliminary action allows the device to make an informed decision about whether to wake up fully for paging monitoring, thereby avoiding unnecessary wake-ups and reducing power consumption while maintaining reliable message delivery when needed.
2Measurement precision
If devices monitor paging occasions continuously, then synchronization accuracy is improved, but energy consumption increases
Solution Approach 1:
The wake-up signal is transmitted beforehand to prepare the device for potential paging monitoring. This preliminary notification allows the device to maintain synchronization only when necessary, rather than continuously monitoring, thus reducing energy consumption while preserving synchronization accuracy when downlink messages are present.
3Use of energy by moving object
If wake-up signals are transmitted before every paging occasion, then power saving is improved, but network overhead increases
Solution Approach 1:
The wake-up signal is selectively transmitted only when necessary, based on local network conditions and device requirements. This localized approach allows the network to optimize between power saving and overhead by transmitting wake-up signals only when downlink messages are actually present or expected, rather than uniformly before every paging occasion.
Data Source
AI summary
A method of operating an infrastructure node in a wireless communications system is provided. The method comprises detecting that downlink messages for a communications device to decode should be transmitted by the node in one or more of a plurality or temporally spaced paging occasions, and determining that a wake-up signal (WUS) should be transmitted by the node to the communications device in advance of each of the one or more paging occasions which comprise the downlink messages for the communications device to decode, determining that a time since a most recent transmission of a signal which can be used by the communications device to re-synchronise with the node is greater than a predetermined threshold and transmitting, in response to determining that the time since the most recent transmission from the infrastructure equipment to the communications device is greater than the predetermined threshold, a preamble signal to the communications device.