Standalone SC-FDE Cell Dormancy via Conditional PSS Detection
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Solution Overview
Problem
In 5G NR systems, devices face challenges in efficiently detecting synchronization signals for cell activation during initial access or transition from idle/inactive states due to the periodic transmission of SS/PBCH blocks, which can lead to inefficiencies in cell dormancy management.
Innovation Solution
A method and apparatus for a WTRU to determine candidate PSS parameter values, perform PSS detection, and transmit a cell activation request (CAR) based on detected PSS parameters to manage cell dormancy, optimizing synchronization signal detection and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the WTRU performs PSS detection on multiple synchronization frequencies to accurately determine cell dormancy state, then the cell activation accuracy is improved, but the detection time and processing complexity increase
Solution Approach 1:
The patent segments the PSS detection process by first performing detection on a first synchronization frequency to identify a dormancy-indicating PSS, then conditionally performing a second detection on a second synchronization frequency only if the first detection indicates dormancy. This segmented approach reduces average detection time while maintaining accuracy by avoiding unnecessary second detections when the cell is already identified as dormant.
Solution Approach 2:
The patent implements a dynamic detection strategy where the second PSS detection is performed conditionally based on the outcome of the first detection. The system adapts its detection behavior dynamically - performing full multi-frequency detection only when needed (when first detection indicates dormancy) and skipping the second detection when the first result is sufficient, thereby optimizing the trade-off between accuracy and time.
2Reliability
If the WTRU transmits cell activation request (CAR) signals frequently to ensure reliable cell activation, then the activation reliability is improved, but the power consumption and network interference increase
Solution Approach 1:
The patent implements a feedback mechanism where the WTRU determines cell dormancy state based on PSS detection results and adjusts its CAR transmission behavior accordingly. When dormancy is detected, the WTRU transmits CAR signals to activate the cell; when no dormancy is detected, transmission is avoided. This feedback-driven approach ensures reliable activation when needed while conserving energy and reducing interference when the cell is already active.
Solution Approach 2:
The patent employs periodic PSS detection and conditional CAR transmission based on detected dormancy states. Rather than continuous transmission, the system performs detections periodically and triggers CAR transmission only when dormancy conditions are met, reducing overall power consumption and network interference while maintaining activation reliability through periodic monitoring.
3Adaptability or versatility
If the network transmits SS/PBCH blocks periodically to enable device discovery, then the cell coverage and accessibility are improved, but the network power consumption and spectrum resources are increased
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure multiple synchronization frequencies with PSS sequences before actual cell activation is needed. When a WTRU needs to access the network, it can quickly detect the pre-configured PSS on these frequencies to determine cell dormancy state, enabling fast cell discovery and activation without requiring continuous SS/PBCH block transmissions, thus reducing network power consumption while maintaining accessibility.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products related to cell dormancy in standalone single carrier frequency domain equalization (SC-FDE)-based systems. One method may include determining a set of candidate primary synchronization signal (PSS) parameter values, and performing, based on the set of candidate PSS parameter values, PSS detection on a synchronization frequency. Based on the PSS detection, the method may include determining at least one PSS having corresponding PSS parameter values from the set of candidate PSS parameter values and, based on the PSS parameter values of one or more of the at least one PSS, determining that a cell is in a dormancy state. The method may include determining to transmit a cell activation request (CAR) based on one or more criteria associated with the at least one PSS, determining a CAR resource based on the at least one PSS, and transmitting the CAR on the CAR resource.