NTN GNSS Measurement Gaps to Prevent HARQ Stalling
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Solution Overview
Problem
There is a need for techniques to perform Global Navigation Satellite System (GNSS) measurements in Non-Terrestrial Networks (NTN) to support wireless communication systems, particularly in scenarios where simultaneous GNSS operations with NTN operations are not assumed, such as in IoT NTN communications.
Innovation Solution
The solution involves configuring user equipment (UE) to perform GNSS measurements during specific gaps in the connected state, with periodicity, and allowing for event-triggered or updated GNSS measurement gaps, as well as integrating GNSS measurement procedures within Radio Link Failure (RLF) processes and enhanced time or frequency control scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GNSS measurement is performed in connected state without measurement gap, then measurement continuity is improved, but communication quality deteriorates due to HARQ stalling
Solution Approach 1:
The patent segments the connected state into different measurement gaps where GNSS measurement can be performed without interfering with normal communication operations. The measurement gap is divided into specific time intervals within the connected state, allowing GNSS measurements to be conducted periodically without causing continuous communication disruption or HARQ stalling.
2Measurement precision
If GNSS measurement gap is configured with high periodicity, then measurement frequency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of GNSS measurement gap periodicity based on network conditions and UE requirements. The measurement gap configuration can be modified dynamically through network signaling, allowing the system to adjust the balance between measurement frequency and power consumption according to actual operational needs, rather than using a fixed periodicity.
3Measurement precision
If GNSS measurement is performed during RLF procedure, then measurement availability is improved, but procedure complexity increases
Solution Approach 1:
The patent merges GNSS measurement functionality with the existing Radio Link Failure (RLF) procedure by integrating measurement gap configuration into the RLF handling mechanisms. This allows GNSS measurements to be performed during RLF procedure without requiring separate complex measurement arrangements, as the measurement gap configuration is incorporated into the existing RLF procedure framework.
Data Source
AI summary
The disclosure relates to a system and a method for performing a Global Navigation Satellite System (GNSS) measurement in Non-terrestrial network (NTN). In some aspects, a user equipment (UE) may comprises: at least one antenna; at least one radio, configured to perform wireless communication using at least one radio access technology; and one or more processor coupled to the at least one radio, wherein the at least one radio and the one or more processor are configured to cause the UE to transmit, to a network device, Global Navigation Satellite System (GNSS) measurement related information which includes a GNSS measurement gap during which the UE performs a GNSS measurement in a connected state; receive a configuration for the GNSS measurement gap from the network device, wherein the configuration for the GNSS measurement gap comprises a periodicity with which the GNSS measurement gap is repeated; and perform the GNSS measurement in the connected state during the GNSS measurement gap with the periodicity.