D2D Resource Comparison for Cross-Cell Discovery
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Solution Overview
Problem
Existing mobile communication systems face challenges in enabling device-to-device (D2D) communication between user equipment (UE) from different cells or public land mobile networks (PLMNs) with different allocated resources, requiring efficient methods to provide information on compatible resources for reliable D2D discovery and communication.
Innovation Solution
A method where a cellular network node compares device-to-device resources of one cell with those of adjacent cells, generating an information element to transmit to the UE, allowing it to determine compatible resources for D2D communication, even when resources are offset in time or frequency, thereby reducing the amount of data needed for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device-to-device resources are allocated separately by different base stations to user equipment in different cells, then each user equipment can have dedicated resources for D2D discovery and communication, but user equipments located in proximity under different base stations may use different resources, making reliable D2D communication difficult
Solution Approach 1:
The patent establishes a universal resource pool configuration that can be used across multiple cells and PLMNs. By defining a set of device-to-device resources at a higher level (e.g., network-wide or region-wide) rather than cell-specific, the same resources become universally applicable to all user equipments in proximity, regardless of which base station or cell they are connected to, thus enabling reliable D2D communication across different cellular boundaries
Solution Approach 2:
The patent introduces parameters such as a flag or indicator in system information blocks that signal whether a universal resource pool is configured. By changing the state of this parameter, the network can dynamically switch between cell-specific resource allocation and universal resource pool usage, allowing flexible adaptation to different deployment scenarios while maintaining resource compatibility
2Loss of information
If all device-to-device resource information for all cells is transmitted to the user equipment, then the user equipment can discover devices in any cell, but the amount of information to be transmitted becomes very large
Solution Approach 1:
The patent extracts only the essential information needed for D2D resource determination from the complete resource allocation data. Instead of transmitting full resource pool configurations for all cells, the system extracts and transmits only the key identifier (e.g., a flag or index) that allows the user equipment to derive the actual resource allocations locally, dramatically reducing signaling overhead while maintaining information completeness
Solution Approach 2:
The patent enables user equipment to create local copies of device-to-device resource information by deriving it from received indicators and applying local computations. Rather than receiving actual resource data from every cell, the UE receives compact indicators and independently generates the necessary resource information, reducing the quantity of transmitted data while ensuring information accuracy
Data Source
AI summary
To provide information on resources for a device-to-device discovery and/or a device-to-device communication, a comparison of device-to-device resources for a cell and further device-to-device resources for at least one further cell different from the cell is performed. At least one information element of a message for transmission to a user equipment is generated based on a result of the comparison.