RRC Signaling for High-Speed Train Synchronization Latency
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Solution Overview
Problem
High-speed train scenarios face challenges in reducing latency for Radio Resource Management (RRM) measurements and Primary Synchronization Signal (PSS)/Secondary Synchronization Signal (SSS) detection due to the lack of a comprehensive mechanism to switch to high-speed mode and enhance operations accordingly.
Innovation Solution
A wireless device and cellular base station configuration that includes receiving and transmitting Radio Resource Control (RRC) signaling with specific information elements to enable or disable enhancements on Secondary Cells (SCell) and Primary Secondary Cells (PSCell), allowing for reduced time periods for PSS/SSS detection and intra-frequency measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional measurement and detection procedures are used in high-speed train scenarios, then the system maintains standard operational protocols, but latency is excessive and cannot meet high-speed requirements
Solution Approach 1:
The patent implements dynamic adaptation by enabling the wireless device to switch between conventional and high-speed measurement modes based on detected mobility conditions. The system dynamically adjusts measurement parameters, detection time periods, and evaluation criteria according to the train's speed, transforming a static measurement system into one that adapts its behavior to match the operational context, thereby reducing latency in high-speed scenarios without compromising standard operations at lower speeds.
Solution Approach 2:
The patent applies parameter changes by modifying measurement-specific parameters such as detection time periods, measurement intervals, and evaluation thresholds when high-speed mode is activated. The network configures different parameter sets for different mobility scenarios, allowing the system to optimize performance for high-speed train operations by adjusting these parameters while maintaining standard parameter configurations for conventional scenarios.
2Loss of time
If measurement time periods are reduced for high-speed operations, then latency is reduced, but measurement precision may be compromised
Solution Approach 1:
The patent resolves this contradiction by implementing parameter changes that are specific to high-speed scenarios. When high-speed mode is detected, the system adjusts measurement parameters including reducing detection time periods while simultaneously modifying evaluation criteria and measurement configurations to maintain accuracy. This allows the system to achieve both reduced latency and preserved measurement precision through coordinated parameter adjustments rather than simple time reduction.
Solution Approach 2:
The system dynamically adjusts measurement precision requirements based on the operational mode. In high-speed mode, the system uses optimized measurement procedures with reduced time periods but compensates with enhanced signal processing and evaluation methods. The measurement precision is maintained through dynamic adaptation of the measurement strategy rather than through static, time-consuming procedures.
3Adaptability or versatility
If comprehensive RRC signaling with multiple information elements is implemented, then high-speed mode control is achieved, but signaling complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the RRC signaling structure into modular information elements, each handling specific aspects of high-speed mode control. Rather than implementing a single complex signaling message, the system segments the control functionality into distinct IE components that can be independently configured and processed. This modular approach reduces overall signaling complexity while maintaining comprehensive control capability.
Solution Approach 2:
The patent implements universality by designing RRC information elements that serve multiple functions. The same IE structure is used for both conventional and high-speed mode control, allowing the signaling mechanism to be universally applicable across different operational scenarios. This multi-functional design reduces the need for separate specialized signaling structures for high-speed operations.
Data Source
AI summary
The present disclosure relates to apparatus, methods, computer-readable storage medium and computer program product for high speed train measurements and signaling. A wireless device, comprising: at least one antenna; at least one radio coupled to the at least one antenna; and a processor coupled to the at least one radio; wherein the processor is configured to: receive, via the at least one radio, at least one Radio Resource Control (RRC) signaling from a cellular base station, the at least one RRC signaling at least comprises one or more information element (IE) of a group of IEs, wherein, the group of IEs at least includes a first IE indicating to enable or disable enhancement on a Secondary Cell (SCell) in Frequency Range 2 (FR2), and a second IE indicating to enable or disable enhancement on a Primary Secondary Cell (PSCell); and perform enhancement on one or more corresponding cells in response to the received at least one RRC signaling, wherein, the enhancement comprises determining a reduced time period for Primary Synchronization Signal (PSS)/Secondary Synchronization Signal (SSS) detection and/or determining a reduced time period for intra-frequency measurements.