Sidelink Timing Adjustment via Feedback Commands
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Solution Overview
Problem
Existing wireless communication systems face challenges in synchronizing sidelink transmissions between user equipment (UEs) due to differences in propagation delays and lack of synchronization between base stations, leading to misalignment of sidelink transmission times.
Innovation Solution
A method where a receiver UE determines timing differences based on sidelink reference signals from transmitter UEs and sends timing adjust (TA) commands to adjust the sidelink transmit times, ensuring alignment with the receiver's sidelink reception window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink transmissions are performed without timing adjustment, then device complexity is reduced, but transmission reliability deteriorates due to misalignment with reception windows
Solution Approach 1:
The receiver UE measures the actual arrival time of sidelink transmissions and compares it with the expected timing based on reception window configuration. This timing difference information is fed back to the transmitter UE via TA commands, enabling the transmitter to adjust its transmission timing to align with the receiver's expected reception windows, thereby improving reliability
Solution Approach 2:
Each UE autonomously determines its own sidelink transmission timing based on received TA commands without requiring network coordination. The transmitter UE independently adjusts its transmission time by applying the TA value to advance its timing, achieving reliable synchronized communication through self-service timing adjustment
2Measurement precision
If timing alignment is achieved through network coordination, then transmission timing accuracy is improved, but network dependency increases and loses effectiveness in out-of-coverage scenarios
Solution Approach 1:
The patent implements autonomous timing adjustment where UEs independently measure timing differences and exchange TA commands directly without network involvement. This self-service mechanism enables precise timing alignment to be achieved through distributed UE cooperation, maintaining adaptability for out-of-coverage operations while achieving measurement precision comparable to network-coordinated methods
Solution Approach 2:
The TA command acts as an intermediary mechanism that enables timing synchronization between UEs without requiring direct network coordination. Through this intermediary exchange of timing adjustment information, UEs can achieve precise timing alignment autonomously in out-of-coverage scenarios
3Productivity
If sidelink transmissions use fixed timing without adjustment, then device complexity is minimized, but time loss increases due to missed transmissions outside reception windows
Solution Approach 1:
The patent transforms fixed timing into dynamic timing adjustment. The transmitter UE continuously adapts its transmission timing based on measured timing differences and received TA commands. This dynamic adjustment ensures transmissions are consistently aligned with the receiver's moving reception window, eliminating time loss from missed transmissions while maintaining high communication efficiency
Solution Approach 2:
Through continuous feedback of timing difference measurements and TA commands, the system dynamically optimizes transmission timing to maximize the overlap between transmitted signals and reception windows, thereby eliminating time loss from missed transmissions and improving overall sidelink communication efficiency
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a receiver user equipment (UE) receives, from a transmitter UE, a sidelink reference signal over a sidelink established with the transmitter UE, and transmits a sidelink timing adjust (TA) command to the transmitter UE based on the sidelink reference signal, the sidelink TA command requesting the transmitter UE to adjust a sidelink transmit time of the transmitter UE. In an aspect, a transmitter UE transmits, to a receiver UE, a sidelink reference signal over a sidelink established with the receiver UE, and receives a first sidelink TA command from the receiver UE based on the sidelink reference signal, the sidelink TA command requesting the transmitter UE to adjust a sidelink transmit time of the transmitter UE.