Sidelink Wake-Up Signal Configuration Sharing
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) in an idle or inactive state lacks the wake-up signal (WUS) configuration to request on-demand signals from network entities, leading to inefficiencies in network energy saving (NES) procedures.
Innovation Solution
UEs share WUS configurations via sidelink channels, utilizing physical sidelink control, shared, or broadcast channels to exchange configuration information, enabling UEs to obtain WUS configurations without direct signaling from network entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE uses direct network signaling to obtain WUS configuration, then configuration accuracy is improved, but network complexity and signaling overhead increase
Solution Approach 1:
The patent introduces a first UE as an intermediary that has already obtained WUS configuration from the network and shares this configuration with second UEs via sidelink channels. This mediator approach allows second UEs to acquire accurate WUS configurations without direct network signaling, thereby maintaining configuration accuracy while reducing network signaling complexity and overhead.
2Productivity
If UE transmits WUS to request on-demand signals, then network energy saving efficiency is improved, but energy consumption and signaling resources increase
Solution Approach 1:
The patent enables UEs to perform self-service by sharing WUS configuration information via sidelink channels with other UEs. Second UEs can obtain the necessary configuration to transmit WUS signals without requiring direct network assistance, thereby reducing overall energy consumption and signaling resources while maintaining network energy saving efficiency.
3Reliability
If network provides continuous signaling for WUS configuration, then configuration reliability is improved, but loss of energy and resources increase
Solution Approach 1:
The patent applies preliminary action by having the first UE obtain and cache the WUS configuration from the network in advance, then share this pre-acquired configuration with second UEs via sidelink channels. This approach ensures configuration reliability for second UEs without requiring continuous network signaling, thereby reducing network energy loss and resource consumption.
Data Source
AI summary
Some communications systems include one or more cells that provide on-demand signaling for network energy saving (NES). In on-demand signaling, a user equipment (UE) in an idle or inactive state transmits a wake-up signal (WUS) to the cell (e.g., network entity) to request an on-demand signal. Examples of on-demand signals include a synchronization signal block (SSB) signal or a system information block (SIB) signal. For instance, a SIB1 may be transmitted when an uplink WUS is detected by the cell. The UE may utilize a WUS configuration to transmit the WUS to the cell. For instance, the WUS configuration may be utilized to perform time tracking, frequency tracking, or pathloss measurement to transmit the WUS. In some approaches, the WUS configuration may be carried by a physical broadcast channel (PBCH) from a cell.