NTN Access Timer Scheduling for Accurate RRM and RLM Timing
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Solution Overview
Problem
Existing timers in Radio Resource Management (RRM) and Radio Link Monitoring (RLM) procedures are not optimized for Non-Terrestrial Networks (NTN) scenarios, leading to inaccurate timing due to large transmission delays and increased power consumption.
Innovation Solution
Adopt a method where the start time of timers is deferred by a determined time interval length, which is based on parameters such as transmitter altitude, speed, and direction, eliminating the need for explicit signaling and reducing power consumption by not monitoring feedback during this interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the expiration term for existing timers in RRM and RLM is increased to address large transmission delays in NTN, then the timer accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple timer parameter sets (first timer parameter set, second timer parameter set, etc.) with different expiration terms before actual timer operations. When NTN service is detected, the system switches to the appropriate pre-configured parameter set with extended expiration terms, avoiding the need to continuously adjust timer values and reducing processing overhead.
Solution Approach 2:
The patent implements dynamics by making timer expiration terms adjustable and scenario-dependent. Different expiration terms are applied based on the service type (TN vs NTN), and the system dynamically selects the appropriate timer parameters. This allows the timer accuracy to be optimized for NTN scenarios without permanently increasing power consumption for all operations.
2Measurement precision
If timer expiration term is extended to account for RTT in NTN, then timing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by configuring different timer parameters for different service locations or types. Specifically, first timer parameters are used for TN services while second timer parameters (with extended expiration terms) are used for NTN services. This localized configuration ensures timing accuracy for NTN without adding signaling overhead for TN operations.
Solution Approach 2:
The patent implements parameter changes by modifying timer expiration terms based on service type. The system changes the timer parameters (specifically the expiration term) when transitioning from TN to NTN service, allowing accurate timing for NTN scenarios without permanently altering the timer behavior for all services.
3Device complexity
If a unified timer solution is applied for both TN and NTN scenarios, then device complexity is reduced, but timing accuracy for NTN deteriorates
Solution Approach 1:
The patent applies universality by creating a unified timer mechanism that can serve both TN and NTN scenarios through parameter configuration. The same timer infrastructure is used for both service types, but different expiration term parameters are applied based on the detected service type. This maintains low device complexity while achieving accurate timing for NTN through parameter adaptation.
Data Source
AI summary
Disclosure discloses a method and a device in a node used for wireless communications. A node first receives first information, and then transmits a first signal and triggers a first timer, the first timer is expired and triggers a first procedure; the first information is used to determine a first time interval length; the first timer is started in a first time window, the first time window comprising a positive integer number of slots; a time interval between an end time of transmission of the first signal and a start of the first time window is equal to the first time interval length; the first procedure is related to the type of the first timer. By associating a start time of timing of the first timer with the first time interval length, the present disclosure optimizes the RRM and/or RLM timer design in NTN, thus improving the overall performance.