LTM-Based Mobility Latency and Interruption Handling
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Solution Overview
Problem
Existing wireless communication systems experience disruptions and communication errors during handover procedures due to unawareness of UE capabilities and interruption times, leading to increased latency and potential loss of application layer connections.
Innovation Solution
A method where a user equipment (UE) receives LTM-based configurations of neighbor cells, identifies latency and interruption information, and indicates this information to a network node, allowing the network to minimize interruption and latency for RACH communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE transmits signaling to neighbor cells without waiting for RRC occasion, then the handover latency is reduced, but communication interruptions occur during the transmission
Solution Approach 1:
The network node determines the interruption time in advance based on UE capabilities (tuning time, processing time, retuning time) before the actual handover signaling transmission occurs. This allows the network to proactively schedule or compensate for the known interruption period, reducing its impact on communication continuity while maintaining fast handover latency.
2Device complexity
If the network node is unaware of UE capabilities, then the system complexity is reduced, but the interruption time duration cannot be determined accurately
Solution Approach 1:
The UE provides feedback to the network node regarding its capabilities (tuning time, processing time, retuning time) through capability reporting mechanisms. This feedback enables the network node to accurately determine the interruption time duration without increasing overall system complexity, as the information is obtained through existing uplink feedback channels.
3Reliability
If the UE retunes to the serving cell during handover, then communication with the serving cell is restored, but latency is introduced for transmitting RACH communications to neighbor cells
Solution Approach 1:
The handover process is made dynamic by allowing the UE to flexibly manage its retuning timing based on received indications from the network node. The network node provides guidance on when the UE should retune to the serving cell, enabling optimization of both serving cell communication restoration and RACH transmission latency based on current radio conditions and network requirements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive layer-1/2-triggered mobility (LTM)-based configurations of one or more neighbor cells. The UE may transmit an indication of one or more of a set of one or more latencies or a set of interruption information in association with transmitting random access channel (RACH) communications associated with respective configurations of the LTM-based configurations of the one or more neighbor cells. Numerous other aspects are described.