Mitigating Interference Between Mobile Devices via Session Transfer
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Solution Overview
Problem
Interference between public safety narrowband and broadband wireless communication systems due to spectral proximity, leading to undesirable radio interference and desensitization of receivers in mobile devices.
Innovation Solution
A method and system that determine geographical proximity between mobile devices to identify potential interferers and transfer communication sessions or use a remote device as a relay to mitigate interference, allowing for consolidation of communication sessions on a single device to control uplink transmissions and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile devices operate both narrowband and broadband communication sessions simultaneously, then communication versatility is improved, but interference between sessions increases due to spectral proximity
Solution Approach 1:
The system segments communication sessions by spatial location, separating them into different geographical zones. Mobile devices are assigned to specific sessions based on their location, and sessions are transferred between devices when moving between zones. This spatial segmentation prevents co-located devices from causing mutual interference while maintaining the ability to handle both narrowband and broadband communications.
Solution Approach 2:
The system introduces a network entity (e.g., P25 gateway, P25 interworking function, or access network device) as an intermediary that coordinates session transfers between mobile devices. This intermediary manages the complexity of interference mitigation by centralizing the decision-making process for session allocation and transfer, allowing individual devices to operate both narrowband and broadband sessions without direct interference management overhead.
2Object-affected harmful factors
If communication sessions are transferred between mobile devices based on geographical proximity, then interference is reduced, but system complexity increases
Solution Approach 1:
The system performs preliminary actions by pre-defining geographical zones and pre-establishing session transfer criteria based on location. Mobile devices continuously report their geographical location, and the network entity maintains an updated view of device positions. This preliminary spatial awareness allows for proactive session transfers before interference occurs, rather than reacting to interference after it happens, thereby reducing the complexity of real-time interference management.
3Productivity
If mobile devices are geographically co-located for efficient communication, then communication efficiency is improved, but receiver desensitization occurs due to uplink interference with downlink reception
Solution Approach 1:
The system implements dynamic session allocation where mobile devices are dynamically assigned to different communication sessions based on their real-time geographical location. When a device moves into a zone where it would cause or experience interference, the system dynamically transfers sessions to other devices in appropriate zones. This dynamic approach allows devices to be co-located when safe and separated when necessary, optimizing both efficiency and reliability.
Data Source
AI summary
A method, apparatus, and system are provided for mitigating interference between two communication sessions based on a determined geographical proximity of two mobile devices (MDs) to each other. In one embodiment, a geographical proximity is determined of a first MD, engaged in a first communication session, to a second MD, engaged in a second communication session. Based on the determined geographical proximity, one of the two communication sessions is transferred to the other MD so that both communication sessions are resident at, and can be controlled by, a same MD. In other embodiments, wherein a first MD is engaged in two communication sessions, one of the two communication sessions may be transferred to a second MD that is sufficiently geographically distant from the first MD or the first MD may use a geographically distant remote wireless device as an uplink and downlink relay device for one of the communication sessions.