Timing Advance Calculation for Wireless Antenna Systems
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Solution Overview
Problem
As the round trip time for signals increases beyond a predefined range in wireless communication systems, existing technologies face challenges in accurately signaling timing advances, leading to synchronization issues between antenna systems, resulting in uplink data being received outside the expected timing window and potentially being discarded.
Innovation Solution
An apparatus and method that calculate a timing advance restricted to a predefined range, estimating the round trip time for a signal to travel between antenna systems, and adjusting the timing advance based on this calculation, ensuring uplink data is transmitted within the correct sub-frame even if the round trip time exceeds the predefined range by aligning it with a duration of one or more sub-frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing advance is increased to compensate for longer round trip time, then synchronization is improved, but timing advance exceeds the predefined range that can be signaled
Solution Approach 1:
The timing advance compensation is segmented into two parts: a signaled timing advance value that falls within the predefined range, and an additional compensation applied at the receiving end based on known propagation delay characteristics. This segmentation allows the system to handle round trip times beyond the original signaling range while maintaining synchronization reliability.
Solution Approach 2:
The solution moves from a single-dimension approach (timing advance signaling only) to a two-dimension approach by incorporating sub-frame timing adjustments. The receiving end uses knowledge of sub-frame boundaries and propagation delay to apply additional timing compensation beyond what can be signaled, effectively adding a temporal dimension to the synchronization mechanism.
2Device complexity
If timing advance is restricted to a predefined range, then signaling complexity is reduced, but communication distance is limited
Solution Approach 1:
The receiving end acts as an intermediary that applies additional timing compensation based on its knowledge of propagation delay and sub-frame timing. This intermediary function allows the system to extend communication distance without increasing the complexity of the timing advance signaling format, as the additional compensation is derived locally rather than being transmitted.
3Manufacturing precision
If uplink transmission timing is adjusted for longer distances, then data reception timing is improved, but processing time for acknowledgements may be compromised
Solution Approach 1:
The receiving end performs preliminary timing adjustment by applying the additional timing compensation before processing the uplink data. By pre-aligning the received data to the expected timing window through this preliminary action, the system ensures accurate timing without extending the subsequent processing time for acknowledgements and retransmission delays.
Data Source
AI summary
There is provided an apparatus and method, the apparatus comprising an antenna system to communicate with a further antenna system. The apparatus includes computation circuitry to calculate a timing advance, restricted to a predefined range, to be applied by the further antenna system, to modify a transmission time for uplink data corresponding to a sub-frame relative to a reception time for downlink data corresponding to the sub-frame at the further antenna system. The computation circuitry is configured to estimate a round trip time, when the round trip time is within the predefined range, to set the timing advance based on the round trip time, and when the round trip time is outside of the predefined range, to set the timing advance to a value within the predefined range, wherein a difference between the value and the round trip time is based on a duration of one or more sub-frames.