SSB-Aligned Wake-Up Signal Transmission for Paging
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Solution Overview
Problem
Current wireless network technologies face challenges in reducing energy consumption for devices in non-connected states, particularly due to uncertainty about the availability of connected-state reference signals and inefficient paging mechanisms, leading to increased energy usage and reduced standby times.
Innovation Solution
A wake-up signal transmission scheme is introduced where paging wake-up signals are transmitted in conjunction with synchronization signal blocks, frequency-multiplexed in the vicinity of SSB PRBs or adjacent symbols, allowing UEs to determine whether to monitor physical channels during paging opportunities, thereby optimizing energy usage without requiring additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor physical channels during all paging opportunities, then paging reliability is improved, but energy consumption increases
Solution Approach 1:
The network transmits a wake-up signal before the paging opportunity to preliminarily indicate whether paging data will be sent. UEs use this advance information to decide whether to activate their receivers and monitor physical channels, avoiding unnecessary energy consumption when no paging is intended.
Solution Approach 2:
The wake-up signal extracts and separates the paging indication function from the main paging channel transmission. This allows UEs to receive paging indications through a simplified signal without needing to decode the full paging channel, reducing processing complexity and energy usage.
2Measurement precision
If UEs monitor physical channels during paging opportunities, then paging detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The wake-up signal provides preliminary indication of paging intent before the actual paging transmission. UEs that detect the wake-up signal know to activate their receivers for accurate paging detection, while UEs that don't detect it can remain in low-power state, avoiding unnecessary detection attempts.
3Adaptability or versatility
If wake-up signals are transmitted separately from SSB, then wake-up signal functionality is added, but device complexity increases
Solution Approach 1:
The wake-up signal is merged with the synchronization signal block (SSB) transmission by frequency-division multiplexing. The wake-up signal occupies specific resource elements within the SSB structure, allowing the network to add wake-up functionality without creating a completely separate signal structure or requiring additional hardware components.
4Productivity
If wake-up signals are frequency-division multiplexed with SSB, then spectrum efficiency is improved, but signal detection difficulty increases
Solution Approach 1:
Specific resource elements within the SSB are designated with local quality characteristics for wake-up signal transmission. These designated REs have specific scrambling codes and modulation schemes optimized for wake-up signal detection, allowing UEs to efficiently identify and detect wake-up indications within the multiplexed SSB structure.
Data Source
AI summary
A method, in a network node configured to communicate wirelessly with wireless devices, includes transmitting a synchronization signal block, SSB, having one or more synchronization signals and transmitting a wake-up signal, WUS, the WUS indicating whether a wireless device or group of wireless devices should monitor a physical channel during at least one paging opportunity associated with the WUS transmission. Transmitting the WUS includes transmitting the WUS in conjunction with the SSB. The WUS may be a tracking reference signal, TRS, for example.