NTN Timing Advance Reporting for RACH-Less Cell Switching
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Solution Overview
Problem
In non-terrestrial networks (NTN), timing advance reporting mechanisms are inadequate, leading to synchronization challenges and inefficient handover processes in wireless communication systems.
Innovation Solution
A novel timing advance reporting procedure is introduced for NTN, enhancing synchronization and handover efficiency by optimizing timing advance calculations and reporting methods tailored for satellite-based networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional timing advance reporting mechanisms are used in NTN, then device complexity is reduced, but synchronization accuracy deteriorates due to inadequate timing advance reporting mechanisms
Solution Approach 1:
The patent changes the parameters of timing advance reporting by introducing new reporting formats, triggering conditions, and calculation methods specifically optimized for NTN environments. This includes modifying timing advance values, offsets, and reporting thresholds to achieve accurate synchronization in satellite communication scenarios.
Solution Approach 2:
The timing advance reporting mechanism is segmented into multiple components including separate reporting for different cell groups, differentiated triggering conditions, and divided timing advance calculations. This segmentation allows precise control over synchronization while managing complexity through modular reporting structures.
2Loss of time
If conventional handover procedures are used in NTN, then device complexity is reduced, but handover latency increases leading to inefficient handover processes
Solution Approach 1:
The patent implements preliminary actions by performing timing advance reporting and measurements before handover is actually needed. UE reports timing advance information in advance, and network prepares handover parameters proactively, enabling faster handover execution without increasing operational complexity during the handover event itself.
Solution Approach 2:
The handover procedure incorporates feedback mechanisms where UE continuously reports timing advance measurements and synchronization status to the network. This feedback enables the network to make informed handover decisions and adjust handover parameters dynamically, reducing latency through data-driven handover timing.
3Measurement precision
If optimized timing advance calculations are implemented for NTN, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces intermediary elements such as timing advance offsets, reference timing values, and intermediate calculation parameters that simplify the overall timing advance calculation process. These intermediaries break down complex NTN timing calculations into manageable steps while maintaining synchronization accuracy.
4Measurement precision
If enhanced timing advance reporting is implemented, then synchronization accuracy is improved, but uplink signaling overhead increases
Solution Approach 1:
The timing advance reporting mechanism is designed to serve multiple functions simultaneously: synchronization maintenance, handover preparation, uplink timing alignment, and network optimization. By making the reporting mechanism universal, the patent reduces the need for separate dedicated signaling for each function, thereby managing overhead while improving synchronization.
Data Source
AI summary
A method may include a wireless device receiving resource control (RRC) messages comprising configuration parameters of a layer 1/layer 2 triggered mobility (LTM) and a configured grant Type 1 for one or more physical uplink shared channel (PUSCH) transmissions of a random access channel (RACH)-less LTM cell switch. The method may also include receiving a medium access control (MAC) control element (CE) triggering an LTM cell switch procedure for the RACH-less LTM cell switch. The method may also include determining not to initiate a random access (RA) procedure based on the RACH-less LTM cell switch being ongoing. The method may also include, based on the RACH-less LTM cell switch being ongoing, not initiating the RA procedure. The method may also include transmitting, using the configured grant Type 1 and for the RACH-less LTM cell switch, a first PUSCH transmission of the one or more PUSCH transmissions.