Resource Selection for D2D Communication Collision Avoidance
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Solution Overview
Problem
Current device-to-device (D2D) communication technologies in 5G systems face challenges in supporting low-delay and high-reliability direct communications, particularly between high-speed and low-speed equipment, due to issues with resource reservation intervals leading to collisions and interference.
Innovation Solution
A resource selection method that senses scheduling assignments for other user equipment, measures received power and energy, and selects resources based on these parameters to avoid collisions, involving steps such as reserving specified periods for resource selection when reservation intervals are below a threshold, and transmitting the selected resources for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a small reservation interval is used for resource allocation, then resource utilization efficiency is improved, but collision and interference between equipments increase
Solution Approach 1:
The patent applies preliminary action by performing sensing and resource reservation in advance before actual data transmission. The transmitting equipment senses the channel status and reserves resources ahead of time, allowing other equipment to be aware of upcoming transmissions and avoid collisions. This advance preparation enables small reservation intervals while maintaining reliability through proactive collision avoidance mechanisms.
Solution Approach 2:
The patent implements feedback through the sensing mechanism where transmitting equipment continuously monitors the channel by detecting scheduling assignments from other equipments. This feedback loop provides real-time information about channel occupancy, enabling dynamic adjustment of resource selection. The feedback system allows the network to adapt to changing conditions and avoid collisions even with small reservation intervals by making informed resource allocation decisions.
2Reliability
If resource sensing and measurement procedures are enhanced to avoid collisions, then transmission reliability is improved, but processing complexity increases
Solution Approach 1:
The patent extracts and separates the sensing and measurement functions from the overall resource allocation process. By isolating these functions into distinct sensing procedures that focus specifically on detecting scheduling assignments and measuring received power, the system achieves comprehensive channel awareness without requiring complex integrated processing. This extraction allows reliable collision avoidance through dedicated sensing while keeping the overall device complexity manageable by dividing concerns into separate, focused functions.
Data Source
AI summary
According to the present disclosure, a resource selection method, characterized in that, comprising the steps of: sensing, within a sensing window, a Scheduling Assignment (SA) for other User Equipments (UEs), measuring a received power based on the SA, and sensing a received energy of each sub-channel of each subframe; selecting a corresponding resource based on the sensed SA, the received power and the received energy; and transmitting the selected resource to other UEs based on the SA to perform data transmission by the resource.