Sidelink Signal Timing Alignment Using GNSS Offset Feedback
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) operating on global navigation satellite system (GNSS) timing poses challenges when a base station lacks knowledge of the GNSS timing, leading to ambiguity in sidelink signal transmission and reception.
Innovation Solution
A method and apparatus for a UE to receive control information from a base station or sidelink UE, determining resource usage by other UEs, requesting resource reselection if necessary, and comparing UTC timing-related information to apply control information accurately, even if the base station's timing is not GNSS-based.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE operates on GNSS timing for sidelink communication, then timing accuracy for sidelink signal transmission and reception is improved, but ambiguity arises when the base station lacks knowledge of the GNSS timing
Solution Approach 1:
The patent introduces timing difference information as an intermediary element that bridges the gap between GNSS-based UE timing and base station timing. The UE calculates the timing difference between its GNSS-based timing and the base station's timing, then reports this difference to the base station. This intermediary information allows the base station to understand and compensate for the timing offset without needing direct knowledge of GNSS timing, thereby resolving the information loss while preserving timing accuracy.
2Device complexity
If the base station does not have GNSS timing knowledge, then system complexity is reduced, but control information application becomes ambiguous
Solution Approach 1:
The patent transforms the timing reference parameter from direct GNSS timing (which the base station cannot access) to a derived timing difference parameter (which can be calculated and communicated). By changing the parameter representation from absolute GNSS time to relative timing offset, the base station can operate without direct GNSS knowledge while still enabling accurate control information application through the reported timing difference.
3Productivity
If the UE uses mode-1/3 resources for sidelink communication, then resource allocation efficiency is improved, but resource collision occurs when multiple UEs use the same resources
Solution Approach 1:
The patent implements a feedback mechanism where UEs monitor for sidelink signals from other UEs and report resource collision information to the base station. The base station receives feedback about which mode-1/3 resources are being used by other UEs and adjusts resource allocation accordingly. This feedback loop enables the base station to maintain high resource allocation efficiency while avoiding collisions by coordinating resource usage across multiple UEs.
Data Source
AI summary
One embodiment of the present invention relates to a method of transmitting and receiving a sidelink signal of a UE, comprising the steps of: receiving, by the UE from one or more of a base station or a sidelink UE, information capable of distinguishing a mode 1/3 signal or a mode 2/4 signal or control information comprising a priority assigned to each of the mode 1/3 and the mode 2/4; determining whether or not a mode 1/3 resource is used by a UE other than the UE, on the basis of the information capable of distinguishing the mode 1/3 signal or the mode 2/4 signal; and requesting, by the UE, a resource reselection to the base station, if the mode 1/3 resource is used by a UE other than the UE and the UE is a mode 1/3 UE.