NCD-SSB Positioning Signals for Low-Power Cell Handover
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Solution Overview
Problem
In radio resource control (RRC) inactive state, terminal devices experience high power consumption due to frequent neighboring cell searches for SRS resources when moving between cells in a user-centric positioning area, as they use the same SRS resources across different cells.
Innovation Solution
Configure non-cell-defining synchronization signal/physical broadcast channel blocks (NCD-SSBs) associated with reference signals, allowing terminal devices to measure these signals at the same frequency domain position across cells, thereby reducing the need for additional neighboring cell searches and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses the same SRS resources across different cells in a user-centric positioning area, then positioning continuity is maintained during cell handover, but the terminal device must frequently perform neighboring cell searches to find SSB signals, resulting in high power consumption
Solution Approach 1:
The patent segments the synchronization signal function by introducing NCD-SSB as a separate entity from traditional cell-defining SSB. The NCD-SSB is specifically configured for positioning purposes and can be transmitted across multiple cells without requiring the terminal to perform full neighboring cell searches, thus maintaining positioning continuity while reducing power consumption.
Solution Approach 2:
The network pre-configures NCD-SSB resources and associations with SRS resources before the terminal needs to perform positioning. This preliminary configuration allows the terminal to directly measure the NCD-SSB without needing to search for SSB signals in neighboring cells, reducing the power consumption associated with frequent cell searches while maintaining positioning reliability.
2Measurement precision
If the terminal device performs frequent neighboring cell searches to find SSB signals for determining SRS sending parameters, then accurate positioning parameters are obtained, but the power consumption increases significantly
Solution Approach 1:
The NCD-SSB acts as an intermediary signal between the network and the terminal for positioning purposes. Instead of requiring the terminal to search for and measure SSB signals in neighboring cells, the NCD-SSB provides the necessary positioning reference information directly, maintaining measurement precision while significantly reducing the power consumption associated with frequent cell searches.
Solution Approach 2:
The patent changes the measurement parameter from traditional SSB signals to NCD-SSB signals. The NCD-SSB is configured with specific parameters (frequency position, time position, association with SRS resources) that enable accurate positioning parameter determination without requiring the terminal to perform power-consuming neighboring cell searches.
Data Source
AI summary
A communication method, an apparatus, a storage medium, and a computer program product. The method includes: a terminal device receives first configuration information from a network device, where the first configuration information includes configuration information of at least one first non-cell-defining synchronization signal/physical broadcast channel block (NCD-SSB) and configuration information of a first reference signal, the at least one first NCD-SSB is associated with the first reference signal, and the first reference signal is used to position the terminal device. The terminal device measures the at least one first NCD-SSB, and determines a sending parameter of the first reference signal.