Time-Frequency Resource Determination for D2D Cellular Interference
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Solution Overview
Problem
The timing offset between cellular and D2D systems causes communication interference in Internet of Vehicles systems, where vehicles inside and outside cellular coverage attempt to communicate simultaneously, leading to disrupted communication between vehicles and base stations.
Innovation Solution
A time-frequency resource determining method that allocates non-overlapping time-frequency resources for D2D and cellular communications by using satellite and base station timings, allowing terminals to skip overlapping resources and use alternative resources to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication uses GNSS timing and cellular communication uses base station timing, then both communication systems can operate independently, but time-frequency resource overlap occurs causing communication interference
Solution Approach 1:
The patent introduces a timing offset parameter as an additional dimension to adjust the time-frequency resource allocation. By adding this temporal dimension adjustment, the system can shift D2D transmission timing relative to cellular transmissions, preventing resource overlap while maintaining independent timing references (GNSS for D2D, base station for cellular).
Solution Approach 2:
The patent changes the timing parameter by introducing and adjusting a timing offset between D2D and cellular communications. This parameter adjustment allows the system to modify the time-frequency resource positions dynamically, ensuring that D2D transmissions do not overlap with cellular transmissions while maintaining the independence of timing sources.
2Area of stationary object
If vehicles communicate simultaneously using different synchronization sources, then communication coverage is extended to out-of-coverage scenarios, but resource collision occurs between IC and OOC vehicles
Solution Approach 1:
The patent segments the time-frequency resources by introducing different timing offsets for IC and OOC vehicles. This segmentation separates the resource usage of vehicles using different synchronization sources (base station vs. GNSS), allowing both in-coverage and out-of-coverage vehicles to communicate reliably without resource collisions.
Solution Approach 2:
The timing offset acts as an intermediary parameter that mediates between IC and OOC communication requirements. By adjusting this intermediary parameter, the system coordinates resource allocation between vehicles with different synchronization sources, preventing collisions while maintaining extended coverage capability.
3Device complexity
If time-frequency resources are allocated without considering timing offset, then resource allocation is simple, but communication interference occurs between overlapping transmissions
Solution Approach 1:
The patent applies preliminary action by calculating and determining the timing offset between D2D and cellular communications before allocating time-frequency resources. This advance determination of the timing relationship allows the resource allocation algorithm to pre-adjust resource positions, preventing interference while keeping the allocation process manageable.
Data Source
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AI summary
A time-frequency resource determining method and an apparatus are provided. When a first terminal (100) uses a first time-frequency resource to communicate with a second terminal (200) by using a D2D system, and the first terminal (100) uses a second time-frequency resource to communicate with a base station by using a cellular system, because the first time-frequency resource partly or completely overlaps the second time-frequency resource, the first terminal (100) skips using the first resource to communicate with the second terminal (200). In this case, communication of the D2D system does not interfere with communication of the cellular system. To be specific, the communication of the cellular system and the communication of the D2D system do not interfere with each other. Therefore, when the first time-frequency resource partly or completely overlaps the second time-frequency resource, a problem that the D2D system causes communication interference to the cellular system so that the first terminal (100) cannot communicate normally is avoided.