eNB D2D Resource Allocation via PDCCH and HARQ Management
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Solution Overview
Problem
Current wireless communication systems face limitations in improving communication capacity, speed, and flexibility, particularly in device-to-device (D2D) links, as they often rely on base stations for resource allocation, which restricts flexibility and efficiency.
Innovation Solution
The systems and methods described enable flexible and controlled resource allocation for D2D links by using evolved NodeBs (eNBs) to manage Hybrid Automatic Repeat Request (HARQ) procedures, allocate resources, and indicate Physical Downlink Control Channel (PDCCH) correspondence based on Downlink Control Information (DCI) formats and Radio Network Temporary Identifiers (RNTIs), allowing direct communication between devices without core network intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication devices communicate via base station, then communication reliability is improved, but communication flexibility deteriorates
Solution Approach 1:
The patent segments communication into two types: network-controlled D2D communication for reliability and autonomous D2D communication for flexibility. Devices can switch between these modes based on requirements, allowing the system to achieve both reliability through base station coordination and flexibility through direct device communication without core network intervention.
Solution Approach 2:
The patent enables dynamic switching between network-controlled and autonomous communication modes. Devices can transition from base station-mediated communication to direct D2D communication based on real-time conditions, allowing the system to adapt communication flexibility while maintaining reliability when needed.
2Ease of operation
If base station manages all resource allocation, then resource allocation control is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent extracts resource allocation control from the base station for autonomous D2D communication scenarios. Devices independently determine and allocate resources without base station intervention, eliminating control overhead and improving allocation efficiency for suitable communication types while the base station retains control for network-dependent scenarios.
Solution Approach 2:
The patent applies partial base station control rather than complete control. The base station manages resources only when necessary (for network-controlled D2D), while allowing autonomous resource allocation for other cases, thereby reducing control overhead and improving overall resource allocation efficiency without completely relinquishing control.
3Adaptability or versatility
If D2D communication is implemented, then communication flexibility is improved, but interference with other device pairs increases
Solution Approach 1:
The patent applies different resource allocation strategies for different D2D communication types. Network-controlled D2D communication uses base station-coordinated resources with quality assurance, while autonomous D2D communication uses independently allocated resources. This local differentiation allows flexibility in autonomous modes while minimizing interference through base station coordination in network-controlled modes.
Solution Approach 2:
The base station acts as an intermediary for resource allocation in network-controlled D2D communication. It coordinates resource assignments to minimize interference between different device pairs while still enabling direct D2D communication, thus maintaining flexibility while reducing harmful interference effects.
4Productivity
If autonomous D2D communication is allowed, then communication efficiency is improved, but resource allocation control deteriorates
Solution Approach 1:
The patent enables dynamic switching between autonomous and network-controlled D2D communication modes. Devices can operate autonomously for efficient direct communication when conditions permit, improving productivity, while the base station can intervene to re-establish control when network coordination becomes necessary, maintaining operational control flexibility.
Solution Approach 2:
The patent changes the control parameter from centralized base station control to distributed device autonomy based on communication type. For autonomous D2D communication, devices independently manage resources improving efficiency, while the system can switch back to base station control when needed, allowing parameter adaptation to balance efficiency and control.
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AI summary
An evolved Node B (eNB) for allocating resources for a device-to-device (D2D) link between User Equipments (UEs) is described. The eNB includes a processor and instructions stored in memory that is in electronic communication with the processor. The eNB allocates resources for a D2D link by using at least one Physical Downlink Control Channel (PDCCH). The eNB further indicates a D2D link direction.