Inter-cell D2D Discovery via Cell Reselection Parameter Adjustment
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Solution Overview
Problem
In device-to-device communication, devices residing in different cells face challenges in setting up communication links due to being served by different base stations, leading to potential unnecessary handovers and complexities in radio resource control.
Innovation Solution
A method and apparatus that observe device-to-device discovery signals to modify cell reselection and selection parameters, allowing devices to be served by the same base station, facilitating inter-cell device discovery and reducing handovers by extending the cell range of the non-serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If devices in different cells communicate directly without modification, then device-to-device communication is enabled, but unnecessary handovers and radio resource control complexities occur
Solution Approach 1:
The patent applies preliminary action by modifying cell reselection parameters before D2D communication occurs. When a device discovers another device in a non-serving cell through D2D discovery signals, it proactively adjusts its cell reselection parameters to prefer the non-serving cell, ensuring both devices will be served by the same base station before communication begins, thus preventing future handovers and reducing RRC complexity.
2Adaptability or versatility
If devices are served by different base stations, then inter-cell device discovery is possible, but unnecessary handovers occur during communication
Solution Approach 1:
The patent uses preliminary action by adjusting cell reselection parameters in advance. When a device observes D2D discovery signals from another device in a non-serving cell, it modifies its parameters to ensure both devices will be served by the same base station before communication starts, thereby maintaining communication link stability while preserving inter-cell discovery capability.
Solution Approach 2:
The patent applies parameter changes by modifying cell reselection parameters (such as offset values) based on observed D2D discovery signals. These parameter changes alter the cell selection criteria to favor the non-serving cell where the discovered device resides, ensuring both devices fall under the same base station's coverage and preventing unnecessary handovers.
3Stability of the object's composition
If standard cell selection parameters are used, then normal cell operation is maintained, but devices cannot be efficiently served by the same base station across cell borders
Solution Approach 1:
The patent applies local quality by making cell selection parameters device-specific rather than uniform across all devices. Each device that discovers another device in a non-serving cell through D2D discovery signals receives customized cell reselection parameters tailored to its specific situation, allowing efficient same-base-station serving while maintaining overall network stability.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting cell reselection parameters for devices engaged in or interested in D2D communication. These localized parameter modifications enable devices to be efficiently served by the same base station without disrupting the stability and normal operation of the broader cellular network.
Data Source
AI summary
There are provided measures for enabling an inter-cell device discovery in device-to-device communication. Such measures may exemplarily include observing, at a device residing in a cell representing a serving cell of said device, a device-to-device discovery signal from another device residing in another cell representing a non-serving cell of said device, and modifying at least one of one or more cell reselection parameters referring to the serving cell of said device and one or more cell selection parameters referring to the non-serving cell of said device on the basis of the observed device-to-device discovery signal.