Single-Frequency Network Continuity with Doppler-Aware Handover
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Solution Overview
Problem
In high-speed train and tunneling environments, user equipment (UE) experiences significant Doppler shifts and angular variations due to rapid movement, leading to challenges in maintaining a continuous connection with a single frequency network, resulting in frequent connection losses.
Innovation Solution
UE and base stations employ techniques to measure Doppler shifts and angular variations, determining HSTT events based on thresholds, and provide configuration information for handovers, beam switching, or changing connection states to maintain connectivity by predicting and adapting to these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If UE moves at high speed in train or tunnel environments, then communication coverage area is expanded, but connection stability deteriorates due to Doppler shifts and angular variations
Solution Approach 1:
The base station performs preliminary actions by determining HSTT events based on Doppler shift and angular variation measurements before connection loss occurs. The base station proactively identifies when a UE is entering high-speed train or tunneling conditions and preemptively configures appropriate parameters to maintain connection stability throughout the movement.
Solution Approach 2:
The system dynamically adjusts connection parameters based on real-time measurements of Doppler shift and angular variation. The base station continuously monitors these parameters and adapts the configuration information provided to the UE, allowing the connection to remain stable despite changing environmental conditions during high-speed movement.
2Device complexity
If conventional connection maintenance methods are used, then system complexity is kept low, but connection losses increase in high-speed scenarios
Solution Approach 1:
The base station autonomously determines HSTT events by measuring Doppler shift and angular variation without requiring complex UE-side processing or additional network infrastructure. The existing base station performs self-service by utilizing its measurement capabilities to identify high-speed scenarios and automatically adjust configuration parameters, maintaining connection reliability without significantly increasing system complexity.
3Reliability
If Doppler shift and angular variation measurements are implemented, then connection stability is improved, but measurement and processing complexity increases
Solution Approach 1:
The patent extracts the complex measurement and processing functions from the UE and concentrates them in the base station. The base station performs Doppler shift and angular variation measurements and determines HSTT events centrally, simplifying the UE's role to providing indication information. This extraction of complex functions to a single location (the base station) reduces overall system complexity while maintaining connection stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the ability of UE to maintain continuous connections with the network by anticipating and adjusting to Doppler shifts and angular variations, reducing connection losses in high-speed scenarios.
Implementation Method 1
determining, by the UE, a measurement of a wireless signal from a first base station of a network, the measurement comprising one or more of: a Doppler shift of the wireless signal
Implementation Method 2
the measurement comprising one or more of: a Doppler shift of the wireless signal, or an angular variation of the wireless signal
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a measurement of a wireless signal from a first base station of a network, the measurement including one or more of: a Doppler shift of the wireless signal or an angular variation of the wireless signal; determine that a high speed train or tunneling (HSTT) event has occurred based at least in part on the measurement; provide, to the first base station, an indication that the HSTT event has occurred; and receive, from the first base station, configuration information to: configure the UE for a handover to a second base station of the network, configure the UE for beam switching, or cause the UE to change a connection state. Numerous other aspects are provided.