NTN Connection Control Using RRCRelease Handover Parameters
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Solution Overview
Problem
Current connection control mechanisms in wireless communication networks are inadequate for non-terrestrial networks (NTNs), as they are primarily designed for terrestrial networks and do not account for service continuity scenarios between terrestrial and NTN networks.
Innovation Solution
Extensions to the RRCRelease message are introduced to facilitate UE movement between terrestrial and non-terrestrial networks by providing specific information such as carrier frequency, satellite ephemeris data, and deprioritization parameters, enabling seamless redirection and synchronization with NTN networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current connection control mechanisms designed for terrestrial networks are used, then device complexity is reduced, but service continuity and handover reliability between terrestrial and non-terrestrial networks deteriorate
Solution Approach 1:
The connection control mechanism is segmented into terrestrial network-specific parameters and non-terrestrial network-specific parameters. The RRCRelease message is divided into standard fields and NTN-specific fields (carrier frequency, satellite ephemeris data, deprioritization parameters), allowing each segment to be optimized independently for its network type while maintaining overall service continuity.
Solution Approach 2:
The patent applies preliminary action by pre-configuring NTN-specific parameters (carrier frequency, satellite ephemeris data, deprioritization parameters) in the RRCRelease message before handover occurs. This allows the user equipment to have all necessary NTN connection information ready in advance, enabling seamless transition without service interruption.
2Measurement precision
If NTN-specific parameters are added to RRCRelease message, then handover accuracy and service continuity improve, but message complexity and information processing requirements increase
Solution Approach 1:
The patent extracts NTN-specific parameters (carrier frequency, satellite ephemeris data, deprioritization parameters) as separate, identifiable fields within the RRCRelease message structure. This extraction allows the message to carry precise NTN handover information while maintaining a structured format that can be processed systematically by user equipment.
Solution Approach 2:
The patent changes the parameter set of the RRCRelease message by adding NTN-specific parameters (carrier frequency, satellite ephemeris data, deprioritization parameters) to the existing message structure. This parameter expansion enables precise NTN handover control while maintaining compatibility with the original message framework.
3Reliability
If seamless handover between terrestrial and non-terrestrial networks is achieved, then service continuity improves, but information loss during transition increases
Solution Approach 1:
The patent applies preliminary action by including all necessary NTN connection information (carrier frequency, satellite ephemeris data, deprioritization parameters) in the RRCRelease message before handover occurs. This ensures that no information is lost during transition, as the user equipment receives complete NTN configuration data in advance.
Solution Approach 2:
The RRCRelease message acts as an intermediary carrier that transports all essential handover information from the terrestrial network to the non-terrestrial network. By embedding NTN-specific parameters within this message, the patent ensures continuous information flow during handover, preventing any information loss.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device for non-terrestrial network (NTN) connection control comprises receiving a message comprising parameters from which the wireless device is informed that it is to disconnect from a terrestrial network (TN) and connect to one of one or more NTNs or disconnect from a NTN and connect to one of one or more TNs. Upon the parameters informing the wireless device to connect to one of one or more NTNs, the method further comprises: disconnecting from the TN; based at least in part on the one or more parameters, selecting one of the detected at least one of the one or more NTNs; and connecting to the selected NTN. Upon the parameters informing the wireless device to connect to one of one or more TNs: the method further comprises disconnecting from the NTN, and detecting, selecting, and connecting to the TN.