Base Station Timing Advance Adjustment for 100km Boundary Transitions
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Solution Overview
Problem
Current communication systems face challenges in maintaining seamless transitions for user equipment (UE) at the 100-kilometer boundary due to limitations in the physical random access channel frame format and timing advance, leading to call drops and poor user experience in long-range communication scenarios.
Innovation Solution
A communication connection method and base station solution that adjusts the access timing advance based on a timing adjustment amount to determine whether the UE meets a trigger condition, sending a trigger signal to prompt the UE for a re-random access request, thereby maintaining orthogonality of OFDM symbols and preventing call drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses fixed timing advance for UE beyond 100 kilometers, then OFDM orthogonality is maintained, but call drops occur when UE crosses the 100-kilometer boundary
Solution Approach 1:
The base station performs preliminary actions by monitoring the timing advance value and trigger conditions before the UE actually crosses the 100-kilometer boundary. When the timing advance indicates the UE is approaching the boundary (within a preset threshold), the base station proactively triggers a random access re-establishment procedure, ensuring seamless transition before call drop can occur.
Solution Approach 2:
The base station continuously monitors the timing advance value as feedback about UE location and uses this feedback to dynamically adjust the access timing advance and trigger random access re-establishment when necessary. This closed-loop feedback mechanism enables the system to adapt to UE movement and maintain connectivity across the 100-kilometer boundary.
2Area of stationary object
If the base station extends the cell radius beyond 100 kilometers, then coverage area increases, but protocol limitations on PRACH and TA are violated
Solution Approach 1:
The base station dynamically adjusts the access timing advance value based on the UE's actual distance and movement. Instead of using a fixed timing advance, the system continuously modifies the TA parameter to accommodate varying distances beyond 100 kilometers, enabling extended coverage while maintaining protocol compliance through adaptive timing adjustments.
Solution Approach 2:
The base station changes the timing advance parameter dynamically to extend coverage beyond the standard 100-kilometer limit. By adjusting the TA value based on trigger conditions and UE location, the system achieves extended cell radius while maintaining protocol compliance through parameter modification rather than protocol change.
3Device complexity
If the base station does not monitor UE location, then system complexity is reduced, but call drops occur at boundary transitions
Solution Approach 1:
The base station uses the timing advance value, which is already calculated and maintained for uplink synchronization, as a self-service indicator of UE location. Instead of implementing a separate complex location monitoring system, the base station leverages the existing TA mechanism to infer UE distance and trigger boundary transitions, reducing system complexity while maintaining reliability.
Data Source
AI summary
A method includes: adjusting, by a base station based on a timing adjustment amount, an access timing advance corresponding to user equipment to obtain a target timing advance, where the access timing advance is a timing advance obtained when the user equipment randomly accesses the base station; determining, by the base station based on the target timing advance, whether the user equipment meets a trigger condition; and if the user equipment meets the trigger condition, sending, by the base station, a trigger signal to the user equipment, where the trigger signal is used to trigger the user equipment to send a first random access request to the base station.