Uplink Timing Control in 5G Wireless Systems
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Solution Overview
Problem
In 5G wireless communication systems, timing mismatches between user equipment (UE) and base stations can lead to Inter Symbol Interference (ISI) due to time offset values, which degrade link performance and are challenging to compensate for effectively.
Innovation Solution
A method and apparatus where a base station determines a target timing for UE to align uplink signal reception within a Cyclic Prefix (CP) interval, transmits a timing control command, and compensates for time offset values based on this target timing to prevent performance degradation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing is periodically adjusted using TA control commands, then time synchronization between base station and UE is maintained, but timing mismatch occurs due to UE movement causing ISI
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the UE timing to a target timing that is intentionally offset from the current timing, rather than waiting for timing mismatch to occur. The base station predicts future timing conditions and pre-adjusts the UE timing to compensate for anticipated movement and maintain synchronization within the CP interval, preventing ISI before it occurs.
Solution Approach 2:
The patent implements dynamics by making the timing adjustment adaptive and flexible. Instead of using fixed periodic adjustments, the system dynamically determines target timing based on current UE timing, movement conditions, and channel state. The timing adjustment is continuous and responsive to changing conditions, allowing the system to adapt to UE movement and maintain optimal synchronization.
2Productivity
If UE timing is adjusted to zero time offset, then link performance is optimized, but additional timing offsets due to UE movement cannot be compensated
Solution Approach 1:
The patent applies feedback by continuously monitoring UE timing conditions and using this information to adjust the target timing. The base station receives timing information from the UE, compares it with the current target timing, and modifies the timing adjustment accordingly. This feedback mechanism enables the system to compensate for additional timing offsets caused by UE movement while maintaining optimal link performance.
Solution Approach 2:
The patent implements parameter changes by dynamically modifying the timing offset parameter based on UE movement conditions. Instead of fixing the timing offset at zero, the system changes the timing parameter adaptively to account for UE displacement. This allows the system to maintain synchronization even when UE movement introduces additional timing variations.
3Object-affected harmful factors
If target timing is set within CP interval, then ISI is reduced, but additional timing offsets from UE movement still occur
Solution Approach 1:
The patent applies segmentation by dividing the timing compensation into two distinct components: a common timing offset compensation and an additional timing offset compensation. The common offset is compensated by adjusting UE timing to the target timing within the CP interval, while the additional offset caused by UE movement is compensated separately through feedback-based adjustment. This segmentation allows each component to be optimized independently.
Solution Approach 2:
The patent uses preliminary action by pre-adjusting the UE timing to a target timing that is calculated to account for anticipated UE movement. The base station proactively determines an appropriate target timing within the CP interval before additional timing offsets occur, ensuring that the UE signal arrives at the optimal time even when UE movement introduces timing variations.
Data Source
AI summary
The present invention relates to a method and device for controlling a timing of a terminal in a wireless communication system. The method for controlling a timing of a terminal by a base station in a wireless communication system may comprise the steps of: determining a target timing of a terminal so as to locate an uplink signal reception timing of the terminal in a cyclic prefix (CP) interval; transmitting, to the terminal, a timing control command including information on the target timing; receiving an uplink signal from the terminal; and compensating for a time offset value of the received uplink signal on the basis of the target timing.