V2X Resource Selection via Sensing to Avoid Collisions
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Solution Overview
Problem
Current 3GPP D2D communication systems face challenges in V2X scenarios due to high-speed devices and high carrier frequencies, leading to severe inter-subcarrier interference and inadequate performance, particularly in avoiding collisions and in-band leakage interference.
Innovation Solution
A data transmission method that involves sensing scheduling assignments and received power or total energy to select or re-select resources, ensuring optimal resource allocation to minimize collisions and interference, using a sensing module, resource selecting module, and sending and receiving module to dynamically adjust resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resource selection is performed without sensing in D2D communication, then device complexity is reduced, but collision and interference between devices increase
Solution Approach 1:
The patent applies preliminary action by performing sensing operations before resource selection to gather information about channel conditions and other device activities. This advance preparation allows devices to make informed resource selection decisions, reducing collisions and interference while maintaining manageable complexity through structured sensing procedures.
Solution Approach 2:
The patent implements feedback mechanisms where devices continuously sense the channel and adjust their resource selection based on sensed information about other devices' transmissions. This feedback loop enables dynamic resource allocation that adapts to changing channel conditions, improving transmission reliability without requiring overly complex centralized control.
2Reliability
If sensing and resource re-selection are performed frequently, then collision avoidance improves, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by performing sensing and resource re-selection at specific intervals rather than continuously. Devices sense the channel periodically and re-select resources based on accumulated sensing information, which maintains collision avoidance capability while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The patent implements partial action by performing sensing on only certain subframes or resource blocks rather than all available resources. This selective sensing approach provides sufficient information for reliable resource selection while reducing the overall sensing burden and energy consumption compared to exhaustive channel monitoring.
3Reliability
If resource allocation is centralized through eNB control, then collision between devices is reduced, but system complexity and signaling overhead increase
Solution Approach 1:
The patent applies self-service by enabling devices to autonomously perform sensing and resource selection without requiring centralized eNB control for each resource allocation decision. Devices independently monitor the channel, detect other devices' transmissions, and select their own resources based on sensed information, which reduces system control complexity while maintaining allocation reliability through distributed intelligence.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure may be applied to intelligent services based on the 5G communication technology and an Internet of Things (IoT)-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present application provides a data transmission method. A first device senses scheduling assignment (SA) and received power of another device, and/or senses a total received energy of all of subframes/sub-bands of the first device. The first device selects or re-selects resources according to the sensing result. The first device transmits data using the resources. The present application also provides a data transmission device. The data transmission method and device can select optimal resources for data transmission to avoid impacts of collisions on data transmission, and can adjust system running state in case of congestion to improve system performance as much as possible.