D2D Resource Hopping Pattern for Signal Detection
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Solution Overview
Problem
Device to Device (D2D) communication in UE systems faces challenges due to half-duplex operation, leading to resource collisions and interference, which hampers successful signal detection and overall transmission performance.
Innovation Solution
A method where User Equipment (UE) determines a resource hopping pattern between D2D transmission physical resources based on its own D2D parameters, allowing UEs to transmit signals in different sub-frames and reducing interference by dynamically adjusting frequency and time domain resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs transmit D2D signals in the same sub-frame, then spectrum resources are utilized efficiently, but resource collisions occur and UEs cannot detect each other's signals due to half-duplex mode limitation
Solution Approach 1:
The patent applies dynamics by making the D2D transmission resources time-varying through resource hopping. UEs dynamically switch between different frequency resources across multiple sub-frames according to a hopping pattern, transforming static resource allocation into dynamic resource allocation. This allows the system to achieve both high spectrum utilization and reliable signal detection by ensuring that colliding transmissions occur at different times and frequencies.
Solution Approach 2:
The patent implements periodic action through periodic resource hopping patterns. UEs transmit D2D signals on different frequency resources in a periodic manner across discovery resource periodicities. This periodic switching of transmission resources ensures that UEs that would collide in one sub-frame get separated in subsequent sub-frames, resolving the contradiction between spectrum utilization and detection reliability.
2Device complexity
If UEs transmit D2D signals over the same frequency resource, then resource allocation is simplified, but in-band emission interference occurs reducing detection probability
Solution Approach 1:
The patent applies parameter changes by dynamically changing the frequency resource parameter for D2D transmissions. Instead of using fixed frequency resources, the system changes the frequency parameter over time according to resource hopping patterns. This parameter variation separates transmissions that would otherwise interfere on the same frequency, reducing in-band emission interference while maintaining manageable resource allocation through standardized hopping rules.
3Object-affected harmful factors
If UEs transmit D2D signals over different frequency resources, then in-band emission interference is reduced, but resource collision still occurs and detection probability drops
Solution Approach 1:
The patent resolves this contradiction through dynamic resource allocation via hopping. UEs transmit on different frequency resources at different times according to their hopping patterns, ensuring both interference avoidance and detection opportunity. The dynamic switching ensures that no two UEs consistently occupy different frequencies that would prevent mutual detection.
Solution Approach 2:
The patent applies preliminary action by pre-configuring resource hopping patterns and discovery resource periodicities before D2D communication begins. This preliminary setup ensures that UEs have predetermined opportunities to transmit and detect each other's signals without interference, establishing reliable detection paths in advance while efficiently utilizing spectrum resources.
Data Source
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AI summary
Disclosed in the present application is a D2D signal transmission method and device, used for enabling a UE, on the basis of the D2D parameters thereof, to determine a resource hopping pattern between different D2D transmission physical resources, and thereby obtain a plurality of D2D transmission physical resources, such that a D2D UE transmitting a D2D signal at any time in the same sub-frame can subsequently transmit a D2D signal in a different sub-frame, thus improving the overall D2D transmission performance of the system. The method provided in the present application comprises: a first UE, on the basis of pre-set D2D parameters, determines the resource hopping pattern between a plurality of D2D transmission physical resources needed to be used by the first UE; the first UE, on the basis of said resource hopping pattern, determines the plurality of D2D transmission physical resources; and the first UE sends a D2D signal on the determined plurality of D2D transmission physical resources.