D2D Resource Selection via State Machine for Coverage Transitions
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Solution Overview
Problem
Current D2D communication systems lack an effective resource selection mechanism, leading to potential interference between UE communications and inadequate resource availability when entering or leaving a base station's coverage.
Innovation Solution
A UE equipped with a resource selection device that creates a state machine model to distinguish between in-coverage and out-of-coverage states, allowing for dynamic selection of appropriate D2D communication resources, thereby avoiding interference and ensuring continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication resources are shared with existing wireless communication systems, then resource utilization efficiency is improved, but interference between UE communications occurs due to lack of effective resource selection mechanism
Solution Approach 1:
The patent applies dynamics by making the resource selection mechanism adaptive to changing coverage states. The UE dynamically switches between in-coverage and out-of-coverage resource pools based on real-time base station coverage status, allowing the system to optimize resource utilization while preventing interference through state-dependent resource allocation.
Solution Approach 2:
The patent implements local quality by defining different resource pools with distinct characteristics for different coverage scenarios. In-coverage UEs use one resource pool with specific properties, while out-of-coverage UEs use another resource pool with different properties, ensuring that each local context (coverage state) has optimized resource characteristics that prevent interference.
2Device complexity
If no resource selection mechanism is implemented, then device complexity is reduced, but resource availability becomes inadequate when UE enters or leaves base station coverage
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple resource pools (in-coverage and out-of-coverage) in advance. When the UE enters or leaves coverage, it can immediately switch to the pre-prepared appropriate resource pool without delay, ensuring continuous resource availability during coverage transitions while keeping the mechanism relatively simple.
Solution Approach 2:
The patent segments the D2D communication resources into distinct in-coverage and out-of-coverage resource pools. This segmentation allows the system to manage resources differently based on coverage state, ensuring that resource availability is maintained during transitions by having separate, pre-configured resources for each state.
3Adaptability or versatility
If conventional D2D communication technologies (Bluetooth, Wi-Fi) are used, then independence from base station is achieved, but transmission power and delay are increased
Solution Approach 1:
The patent applies universality by creating a D2D communication mechanism that works in both base station-covered and uncovered scenarios. The same UE and resource selection mechanism can operate independently when out of coverage or in coordination with the base station when in coverage, providing multi-functionality that adapts to different deployment scenarios while optimizing power consumption.
Data Source
AI summary
The invention relates to a user equipment of device-to-device communications and a resource selection method thereof. The user equipment includes a resource selection device and a transceiver device. The resource selection device is configured to create a state machine model, which includes an in-coverage state and an out-of-coverage state corresponding to a base station. The resource selection device is also configured to select a corresponding device-to-device communication resource in response to a current state of the user equipment during transferring of the user equipment from the in-coverage state to the out-of-coverage state or from the out-of-coverage state to the in-coverage state. The transceiver device is configured to perform a device-to-device communication with another user equipment according to the corresponding device-to-device communication resource. The resource selection method includes the steps corresponding to the operations of the user equipment.