Cell Wake-Up Signaling With Latency-Aware Power Saving
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power consumption and latency in network nodes transitioning between active and power saving modes, particularly in 5G and NR networks, which can impact network efficiency and user equipment performance.
Innovation Solution
Implementing a cell wake-up signal (C-WUS) that indicates a latency tolerance priority, allowing network nodes and user equipment to transition between power saving and active modes while considering latency requirements, thereby optimizing power usage and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network node transitions to active mode immediately upon receiving a C-WUS, then the latency requirement is satisfied, but the power consumption increases
Solution Approach 1:
The network node performs preliminary actions by pre-configuring multiple wake-up occasions and latency tolerance priorities before actual data transmission occurs. When a C-WUS is received, the node can quickly determine the appropriate wake-up timing based on pre-established latency requirements, avoiding delays while maintaining power efficiency through pre-planned transition schedules
Solution Approach 2:
The system changes the parameter of wake-up timing based on latency tolerance priority. Different priority levels correspond to different wake-up occasions, allowing the network node to adjust its transition timing dynamically. High priority traffic triggers immediate wake-up while lower priority traffic allows delayed wake-up, optimizing the balance between latency and power consumption
2Use of energy by moving object
If the network node remains in power saving mode for extended periods, then the power consumption is reduced, but the latency increases
Solution Approach 1:
The system implements dynamic wake-up scheduling where the network node adapts its active periods based on real-time traffic requirements. Multiple wake-up occasions are configured with different timing, allowing the node to transition to active mode at the most appropriate moment that satisfies both power saving goals and latency requirements for different traffic types
Solution Approach 2:
Latency tolerance priorities are determined and configured in advance before data transmission occurs. This preliminary classification allows the network node to pre-plan wake-up schedules, ensuring that when traffic arrives, the appropriate wake-up timing is already established, avoiding both unnecessary active periods and excessive delays
3Productivity
If multiple wake-up occasions are configured with different latency tolerance priorities, then the network efficiency is improved, but the device complexity increases
Solution Approach 1:
The wake-up mechanism is segmented into multiple distinct wake-up occasions, each associated with specific latency tolerance priorities. This segmentation allows the system to handle different traffic types independently, matching wake-up timing to traffic requirements without creating a monolithic complex configuration system
Solution Approach 2:
The C-WUS mechanism serves multiple functions simultaneously: it indicates wake-up timing, conveys latency requirements, and triggers appropriate priority handling. By consolidating these functions into a single signal mechanism, the system achieves high network efficiency without proportionally increasing device complexity
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, in a cell wake-up occasion associated with a network node that is operating in a power saving mode, a cell wake-up signal (C-WUS) that indicates a latency tolerance priority associated with the UE. The UE may communicate with the network node based at least in part on the network node transitioning from operating in the power saving mode to operating in an active mode. Numerous other aspects are described.