Ad-Hoc Network Trunking Control via Mobile Station Election
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In trunked communication systems, when the site controller becomes unavailable, such as during emergencies, there is no effective method to manage trunking operations in ad-hoc networks, as mobile stations struggle to select suitable peers to manage shared traffic channels due to the dynamic nature of ad-hoc networks and the need for information repetition over short ranges.
Innovation Solution
A system where a control unit is selected from mobile stations in an ad-hoc network to manage trunking operations by assigning repeater pairs and broadcasting system information, using a wideband protocol to extend coverage and maintain communication without the site controller, allowing mobile stations to share narrowband traffic channels and manage calls within the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile stations form an ad-hoc network when the site controller is unavailable, then communication can continue without infrastructure support, but it becomes difficult to select suitable mobile stations to manage trunking operations due to the dynamic nature of ad-hoc networks
Solution Approach 1:
The system enables mobile stations to autonomously elect a control mobile station through a voting mechanism. Each mobile station casts votes for potential control candidates based on their suitability metrics, and the mobile station receiving the most votes automatically becomes the control mobile station. This self-organizing process eliminates the need for external infrastructure intervention while maintaining reliable trunking operations.
Solution Approach 2:
Mobile stations pre-evaluate potential control candidates based on predetermined criteria such as battery level, signal strength, and processing capability before the site controller becomes unavailable. This preliminary assessment ensures that when the election is triggered, the selection process can proceed quickly and efficiently without compromising system reliability.
2Adaptability or versatility
If mobile stations communicate directly over short ranges in ad-hoc mode, then infrastructure independence is achieved, but information must be repeated multiple times when sending mobile station is more than one hop away
Solution Approach 1:
The control mobile station acts as an intermediary node that receives information from sending mobile stations and distributes it to receiving mobile stations. This centralized coordination eliminates the need for multiple hop-to-hop repetitions, as the control mobile station can broadcast information to all nodes within its range, significantly reducing the total number of transmissions required and conserving energy.
Solution Approach 2:
The control mobile station performs multiple functions including information routing, trunking management, and coordinate communication. By consolidating these functions in a single designated node, the system achieves infrastructure independence while minimizing communication overhead and energy consumption across the ad-hoc network.
3Productivity
If mobile stations share narrowband traffic channels in trunking mode, then communication efficiency is improved, but effective management becomes impossible without a site controller during emergencies
Solution Approach 1:
The control mobile station autonomously manages trunking operations including channel assignment, call setup, and resource allocation without requiring external site controller intervention. This self-service capability maintains high communication efficiency by preserving trunking functionality while ensuring reliability during emergencies through decentralized control.
Data Source
AI summary
A control unit is selected from a plurality of narrowband mobile stations also forming an ad-hoc network. The control unit is configured to control and manage a narrowband trunking operation via the ad-hoc network. The control unit receives a call request over a narrowband control channel from a first mobile station, assigns a pair of narrowband traffic channels for a call associated with the call request, chooses two mobile stations from the plurality of mobile stations to act as a narrowband repeater for the call, the pair including a respective receiver mobile station and a respective transmitter mobile station, informs the repeater mobile stations of the assignment and of the assigned traffic channels for the call, and grants the call request over the narrowband control channel. The grant includes an indication of the assigned traffic channels on which the repeater mobile stations can be located for the call.