Drop-and-Reconnect Handover for Sidehaul Minimization
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Solution Overview
Problem
In ad hoc vehicular communication networks, the reliance on sidehaul for handover of mobile devices between vehicles is inefficient and unreliable due to factors like low non-directional antennas, building interference, and terrain interference, leading to suboptimal routing of bearer and control sessions.
Innovation Solution
Implementing a handover detection function within each EPS network and mobile device to detect idle states and initiate a drop-and-reconnect process, minimizing the use of sidehaul by transitioning all bearer and control traffic to the new EPS without disrupting the mobile device's communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidehaul is used to route bearer and control sessions from the second vehicle's base station to the first vehicle's Core Network during handover, then seamless handover is achieved, but sidehaul reliability deteriorates due to RF link fragility, low non-directional antennas, building interference, and terrain interference
Solution Approach 1:
The patent extracts the mobile device from the sidehaul routing path by having it drop the existing connection and reattach to the new base station. This removes the need for sidehaul to carry bearer and control sessions during handover, eliminating the reliability issues associated with RF links between vehicles. The mobile device directly connects to the new base station without requiring inter-vehicle sidehaul communication.
2Ease of operation
If sidehaul is used for interconnecting adjacent vehicles during handover, then routing of active bearer and control sessions is facilitated, but sidehaul is lost when deployables are repositioned or leave the incident
Solution Approach 1:
The patent implements preliminary action by having the mobile device detect idle states and proactively initiate the drop-and-reattach process before sidehaul becomes unavailable. The handover detection function monitors the connection state and triggers reattachment to the new base station in advance, ensuring continuous communication without relying on the potentially lost sidehaul connection.
3Productivity
If handover detection function initiates drop-and-reconnect process upon detecting idle state, then sidehaul usage is minimized and traffic is routed through new EPS, but communication interruption may occur during the drop and reattach process
Solution Approach 1:
The patent uses feedback mechanisms where the handover detection function continuously monitors the mobile device's connection state and traffic patterns. When an idle state is detected, the system triggers the drop-and-reattach process. The feedback loop ensures that handover decisions are based on actual communication needs, minimizing unnecessary disruptions while optimizing sidehaul usage.
Data Source
AI summary
A method is provided that facilitates sidehaul minimization by dropping and reconnecting a mobile device when the mobile device has handed off to a second deployable in a deployable ad hoc communication system. A data session is established for the mobile device utilizing resources in the first deployable. At some point the mobile device hands over to a second deployable in the multiple deployable ad hoc network. The data session at the first deployable remains active and continues to send and receive bearer traffic and control traffic for the mobile device. Upon determining that the mobile device has entered an idle state, the mobile device is dropped from the second deployable and reconnects back to the second deployable. By dropping and reconnecting, the data and bearer sessions are moved from the first deployable to the second deployable, thereby eliminating sidehaul between the first deployable and the second deployable.