D2D Mobile Device Group Control for Public Safety Networks
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Solution Overview
Problem
Public Safety Networks (PSN) face challenges in maintaining robustness and connectivity, especially during out-of-coverage situations, base station failures, or network congestion, where mobile devices need to establish connections without delay and resources are scarce.
Innovation Solution
A method where mobile devices competing through a selection mechanism using timers determine which device acts as a controlling node to establish connections via commercial cellular networks, enabling Device to Device mode and alternative network access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile devices establish connections through traditional base station access, then network coverage and connectivity are maintained, but the system fails during base station failures or out-of-coverage situations
Solution Approach 1:
The patent introduces a Device-to-Device (D2D) communication mode as an intermediary mechanism that enables mobile devices to communicate directly with each other when base station access is unavailable. This intermediary communication path allows devices to maintain connectivity and establish ad-hoc networks during out-of-coverage situations, base station failures, or network congestion, thereby resolving the contradiction between maintaining reliable network connectivity and adapting to environments where traditional base station access is unavailable.
Solution Approach 2:
The patent implements dynamic communication mode switching that allows mobile devices to transition between traditional base station access mode and Device-to-Device mode based on real-time network conditions. This dynamic adaptability enables the system to automatically select the appropriate communication mode - using base station access when available and switching to D2D mode when base stations are unavailable or congested - thereby simultaneously achieving reliable connectivity and adaptability to various operational environments.
2Reliability
If multiple mobile devices simultaneously attempt to establish connections as controlling nodes, then connectivity is attempted, but network resources are wasted and connection establishment is delayed
Solution Approach 1:
The patent implements a selection mechanism that operates in advance to determine which mobile device will serve as the controlling node before actual connection establishment begins. This preliminary selection process, which may involve timer-based arbitration or other selection algorithms, prevents multiple devices from simultaneously attempting to establish connections as controlling nodes. By pre-determining the controlling node, the system eliminates redundant connection attempts, reduces network resource waste, and minimizes connection setup time while ensuring reliable connection establishment.
3Adaptability or versatility
If Device to Device mode is enabled for all mobile devices, then out-of-coverage connectivity is achieved, but device complexity and resource consumption increase
Solution Approach 1:
The patent applies local quality by enabling Device-to-Device communication capability selectively in mobile devices based on their specific operational context and requirements. Rather than uniformly enabling D2D mode in all devices regardless of need, the system activates D2D capability locally in devices that are in out-of-coverage situations or require direct communication, while keeping traditional base station access mode active in devices with normal coverage. This selective approach achieves out-of-coverage connectivity where needed while minimizing unnecessary device complexity and resource consumption in devices that don't require D2D functionality.
Data Source
AI summary
A method includes providing a broadband public safety network PSN that includes at least a first MS1 and a second MS2 mobile device and a first coverage area; and providing a broadband mobile communication network CN including a second coverage area 104. The method includes detecting the MS1 and MS2 mobile devices are residing out of the first coverage area and residing in the second coverage area 104. Then the MS1 and MS2 mobile devices are starting to operate in a Device to Device mode 204. The method further includes defining a group including the MS1 and MS2 mobile devices that are communicating in the Device to Device mode. The method includes determining, by using a selection mechanism including one or several timers, which of the MS1 and MS2 mobile devices acts as a controlling mobile device for the group 202.