Multi-band Wake-up Signal Sub-band Availability Indication
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in shared radio frequency spectrum access, particularly in unlicensed bands, due to the need for medium-sensing procedures, which lead to increased signaling overhead and latency when multiple network operating entities contend for resources.
Innovation Solution
The implementation of multi-band wake-up (MWU) and multi-band channel reservation (MCR) signals, scrambled with specific radio network temporary identifiers, allows for early indication of sub-band availability, enabling desirable users to prioritize resource use and aggressors to avoid interference by indicating occupancy status, thus reducing the need for continuous medium sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If medium-sensing procedures are implemented for shared spectrum access, then resource contention between network operating entities is managed, but signaling overhead and latency increase
Solution Approach 1:
The patent implements wake-up signals that are transmitted in advance before actual data transmission to indicate sub-band availability. This preliminary indication allows network operating entities to prepare for upcoming transmissions without requiring continuous medium sensing, thereby reducing signaling latency while maintaining reliable shared spectrum access management
Solution Approach 2:
The patent extracts the medium-sensing function from continuous operation and replaces it with event-driven wake-up signals. By taking out the continuous sensing requirement and substituting it with periodic wake-up indications, the system maintains necessary resource contention management while eliminating unnecessary signaling overhead during idle periods
2Reliability
If continuous medium sensing is performed by multiple network operating entities, then resource contention is resolved, but processing complexity and signaling overhead increase
Solution Approach 1:
The patent implements a system where the network operates in idle mode without continuous sensing, and only activates medium-sensing procedures when wake-up signals indicate sub-band availability. This self-service approach allows the system to maintain resource contention resolution capability while reducing processing complexity during idle periods by allowing entities to sleep and wake only when necessary
3Productivity
If wake-up signals are transmitted to indicate sub-band availability, then resource utilization efficiency improves, but additional signaling is required
Solution Approach 1:
The patent implements periodic wake-up signal transmissions at configured intervals rather than continuous signaling. This periodic action maintains efficient resource utilization by notifying network operating entities of sub-band availability only when changes occur or at scheduled times, thereby improving productivity while minimizing the quantity of signaling overhead compared to continuous indication
Data Source
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AI summary
Multi-band Wake-up (MWU) signal transmission and detection is disclosed. A transmitter determines a MWU signal that indicates availability of one or more sub-bands to a first user in a serving cell, and transmits the MWU signal for the one or more sub-bands in the serving cell. A clear channel assessment (CCA) status on the one or more sub-bands that are available to the first user is carried by the payload of MWU signals. The MWU signal includes a first user identifier that identifies the first user as a targeted receiver of the MWU signal. The first user has priority over a second user to utilize the one or more sub-bands. Correspondingly, a receiver receives a MWU signal for one or more sub-bands in the serving cell, decodes a payload of the MWU signal, and determines availability of the one or more sub-bands to the first user based on the payload of the MWU signal.