D2D Signal Transmission Priority and Timing Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving device-to-device (D2D) signals, particularly in scenarios where the transmission timing of WAN signals mismatches with D2D signals or when D2D signals have different transmission timings, leading to potential interference and disrupted signal performance.
Innovation Solution
The proposed solution involves a method where user equipment (UE) can selectively transmit either WAN or D2D signals based on timing alignment, stopping D2D signal transmission when there is significant mismatch, and reporting capability to the eNB to optimize scheduling, ensuring efficient coexistence of WAN and D2D communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D signal transmission is performed simultaneously with WAN signal transmission, then communication efficiency is improved, but signal interference occurs due to timing mismatch
Solution Approach 1:
The patent segments the transmission timing into distinct regions: D2D transmission time region, WAN transmission time region, and guard periods. By dividing the time domain into separate segments for different transmission types, the system allows simultaneous D2D and WAN communications while preventing interference through temporal separation. The terminal device determines whether to transmit D2D signals based on whether the current time falls within the D2D transmission time region or coincides with WAN transmission or guard periods.
2Reliability
If D2D transmission resources are increased to improve D2D communication performance, then system complexity increases due to resource coordination
Solution Approach 1:
The patent implements preliminary configuration of D2D transmission time regions and WAN transmission time regions in advance. The eNodeB pre-configures these time regions to the terminal device before actual transmission occurs. This preliminary action simplifies real-time decision-making at the terminal device, as it only needs to check whether the current time falls within the pre-configured D2D transmission region, rather than performing complex real-time resource coordination calculations.
3Object-affected harmful factors
If timing alignment between WAN and D2D signals is maintained, then interference is reduced, but transmission flexibility is limited
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the D2D transmission time region to be flexibly configured based on WAN transmission patterns. The eNodeB can adjust the D2D transmission time region configuration according to actual WAN traffic conditions and timing requirements. This dynamic approach maintains timing alignment when needed to reduce interference, while providing flexibility to adapt D2D transmission opportunities based on system conditions, thus balancing interference reduction with transmission flexibility.
Data Source
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AI summary
The present invention provides a method for transmitting and receiving a signal for device-to-device (D2D) communication and an apparatus therefor, which are used in a wireless access system supporting D2D communication. A method for a device transmitting and receiving a signal according to one aspect of the present invention may comprise the steps of: identifying signals that are scheduled for a particular subframe configured for D2D transmission and reception; determining whether the scheduled signals overlap; and transmitting the scheduled signals on the basis of a pre-determined priority if the scheduled signals overlap. To this end, the priority may be determined based on the type of signal. More preferably, the priority may be determined in the order of a synchronisation signal, a D2D communication signal and a D2D discovery signal.