Cell Reselection Priority Adjustment for D2D Communication Continuity
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Solution Overview
Problem
In cellular communication systems, devices may inadvertently reselect to cells that do not support Device-to-Device (D2D) communication, leading to termination of ongoing D2D sessions due to the lack of information about D2D capabilities in neighboring cells or frequencies, as existing priority settings are irrelevant to D2D support.
Innovation Solution
A method for cell reselection that involves receiving and rearranging priority information based on D2D communication support, where communication devices prioritize cells or frequencies that support D2D communication over those that do not, ensuring optimal D2D communication continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is performed according to CellReselectionPriority broadcasted by the network node, then cell reselection follows standard priority rules, but the communication device may reselect to a neighbor cell that does not support D2D communication and is thus forced to terminate the ongoing D2D communication
Solution Approach 1:
The communication device performs preliminary assessment of neighbor cells' D2D support capability before reselection. The device receives and stores D2D support information from multiple neighbor cells in advance, then uses this pre-collected information to guide the reselection decision, ensuring D2D continuity is maintained
Solution Approach 2:
The invention changes the priority parameter dynamically based on D2D support capability. When D2D communication is ongoing, the device modifies the CellReselectionPriority by adding an offset to cells that support D2D, thereby altering the reselection criteria to favor D2D-capable cells without changing the fundamental reselection mechanism
2Productivity
If the communication device selects cells with highest CellReselectionPriority, then reselection follows network-defined priorities, but the highest priority cells may not support D2D communication
Solution Approach 1:
The invention dynamically adjusts the cell priority parameter by adding an offset value to cells that support D2D communication. This parameter modification ensures that when multiple cells have the same base priority, D2D-capable cells are selected first, or when priorities differ, the offset can tip the balance in favor of D2D support
Solution Approach 2:
The invention creates a composite priority metric that combines the network-defined CellReselectionPriority with a D2D support indicator. The final priority used for reselection is a composite of these two factors, ensuring both network optimization and D2D continuity are considered simultaneously
3Loss of energy
If D2D communication is performed in Mode 1 with base station resource allocation, then resource utilization is optimized, but D2D communication cannot be performed when the communication device is out of coverage of the base station
Solution Approach 1:
The invention enables dynamic switching between D2D communication modes based on coverage conditions. When in-coverage, Mode 1 with base station resource allocation is used for optimal efficiency. When out-of-coverage, the device automatically transitions to Mode 2 with autonomous resource selection, maintaining D2D continuity across different coverage scenarios
Solution Approach 2:
The communication device is designed to support both Mode 1 and Mode 2 D2D communication, making it universally adaptable to different coverage scenarios. The device can function with base station assistance when available and autonomously when not, providing versatile D2D communication capability across the entire coverage range
Data Source
AI summary
A cell reselection method adapted to a communication device (UE1) of a communication system (10) includes receiving a first priority information and a Device to Device communication information broadcasted by a network node (ND) of the communication system; and rearranging the first priority information into a second priority information according to the D2D communication information when the communication device is in an operation scenario.