D2D Resource Allocation Modes for LTE Coverage and Congestion
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Solution Overview
Problem
Existing LTE networks face limitations in network capacity and geographical coverage, particularly during high load situations or when devices are outside network coverage, necessitating device-to-device (D2D) communications, which can increase network complexity and require efficient resource allocation.
Innovation Solution
A communications device is configured with indications of first and second communications resources, allowing it to operate within and outside network coverage, with mode 1 resources controlled by the network and mode 2 resources accessed autonomously, and includes access control mechanisms to prioritize and manage D2D communications based on device classes and emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device-to-device communications are implemented to overcome network capacity and coverage limitations, then network efficiency and reliability in challenging conditions are improved, but network complexity and coordination requirements increase
Solution Approach 1:
The patent segments D2D communication resources into two distinct modes: mode 1 with network-controlled resource allocation and mode 2 with autonomous device-selected resource allocation. This segmentation allows the system to balance between network control and device autonomy, improving reliability while managing complexity by providing different operational paths for different scenarios.
Solution Approach 2:
The patent implements dynamic resource allocation where communications devices can switch between mode 1 (network-controlled) and mode 2 (autonomous) D2D operations based on network conditions and coverage availability. This dynamic approach enables the system to adapt to changing conditions, maintaining reliability while optimizing resource utilization and managing network complexity.
2Speed
If autonomous device-to-device communication resources are allocated without network coordination, then access speed and responsiveness are improved, but resource conflicts and interference increase
Solution Approach 1:
The patent separates D2D resources into mode 1 (network-controlled) and mode 2 (autonomous) allocations. Mode 2 provides fast autonomous access when needed, while mode 1 ensures coordinated resource usage when network control is available, thereby balancing access speed with interference management through resource segmentation.
Solution Approach 2:
The network acts as an intermediary that provides coordination signals and resource allocation information to devices performing D2D communications. This intermediary role allows devices to operate autonomously when needed while preventing resource conflicts through network-mediated resource allocation and coordination mechanisms.
3Object-generated harmful factors
If network-controlled resource allocation is used for device-to-device communications, then resource coordination and interference management are improved, but access delay and network load increase
Solution Approach 1:
The patent divides D2D resource allocation into mode 1 (network-controlled for better coordination) and mode 2 (autonomous for faster access). This segmentation allows the system to select the appropriate mode based on whether fast access or better coordination is the priority, thereby balancing interference management with access delay.
Solution Approach 2:
The patent enables dynamic switching between network-controlled and autonomous resource allocation modes. This dynamic approach allows the system to use network-controlled allocation when coordination is critical for interference management, while allowing autonomous operation when fast access is needed and network control is unavailable, thus balancing coordination benefits with access delay.
Data Source
AI summary
A communications device, and method, is configured with at least one of an indication of first communications resources of the wireless access interface which can be allocated on request to the communications device by a mobile communications network for transmitting signals to one or more other communications devices in accordance with the first mode of operation or an indication of second communications resources of the wireless access interface, which can be used by the communications device for transmitting signals to one or more other communications devices in accordance with a second mode of operation using a device to device communications protocol.