CCN Handover via Pending Interest Redirection
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Solution Overview
Problem
In Content Centric Networks (CCNs), mobile devices experience disruptions and data loss during handovers as pending requests time out when moving to new access points, leading to poor user experience due to the lack of reverse path establishment and endpoint addresses.
Innovation Solution
A method is introduced to detect handover initiation and completion events, allowing for the transmission and redirection of pending interests from one CCN access point to another, ensuring seamless mobility by updating the Pending Interest Table (PIT) entries and maintaining continuous data traffic without loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile devices use traditional IP-based routing with host addresses, then routing is simple and based on source/destination addresses, but handovers cause disruptions and data loss due to timeout of pending requests when moving to new access points
Solution Approach 1:
The patent introduces a CCN router as an intermediary that maintains PIT entries and forwards content objects to mobile devices during handover. Instead of relying on endpoint addresses that change during mobility, the router acts as a stable intermediary that tracks pending interests and ensures continuous delivery across access point transitions, preventing request timeouts and data loss.
Solution Approach 2:
The system performs preliminary actions by establishing content-based routing paths and creating PIT entries before handover occurs. Pending interests are pre-configured and tracked in advance, allowing the network to maintain state information and forward content objects seamlessly when the mobile device moves to a new access point, eliminating the need to wait for request timeouts.
2Speed
If CCN nodes cache packets locally in content store, then data retrieval is faster and more efficient, but during handover pending requests time out and data loss occurs due to lack of reverse path establishment
Solution Approach 1:
The CCN router serves as a mediator that maintains the reverse path for content object delivery during handover. While content stores enable fast local caching, the router's PIT entries ensure that when a mobile device hands over to a new access point, the reverse path is maintained through the router, preventing data loss and ensuring reliable delivery of cached and non-cached content.
Solution Approach 2:
The system dynamically updates routing information in PIT entries to reflect the mobile device's current location during handover. The router adapts the reverse path dynamically by updating the incoming interface and next hop information in PIT entries, allowing content objects to be delivered reliably to the moving device while maintaining the speed benefits of local caching at CCN nodes.
3Adaptability or versatility
If handover procedures are performed when mobile devices move between access points, then mobility is supported, but disruptions and data loss occur due to timeout of pending requests and lack of reverse path
Solution Approach 1:
The CCN router acts as a stable intermediary that maintains PIT entries throughout the handover process. When a mobile device moves between access points, the router continues to forward content objects using the stored PIT information, preventing data loss. The intermediary maintains the reverse path even as the device's access point changes, ensuring continuous information delivery during mobility transitions.
Solution Approach 2:
The system ensures continuity of useful action by maintaining PIT entries and reverse paths during handover. Instead of interrupting pending requests when the device moves, the router continuously forwards content objects using the stored routing information, allowing the useful action of data delivery to continue uninterrupted throughout the mobility transition, preventing information loss.
4Ease of operation
If traditional IP routing is used with endpoint addresses, then routing is based on source and destination addresses, but seamless mobility cannot be achieved due to lack of reverse path establishment mechanism
Solution Approach 1:
The CCN router serves as an intermediary that establishes and maintains the reverse path for content delivery. While IP routing relies on endpoint addresses that change during mobility, the CCN router uses content-based routing with PIT entries to create a stable reverse path through the network, enabling seamless mobility without sacrificing routing simplicity. The router mediates between the content source and the moving device, ensuring reliable delivery.
Data Source
AI summary
A method in a first content centric networking (CCN) access point of a CCN network of enabling seamless mobility of a mobile device is disclosed. The method includes detecting a handover initiation event that is an indication that a handover of the mobile device from the first CCN access point to a second CCN access point from a group of one or more CCN access points of the CCN network is initiated. In response to detecting the handover initiation event, the method continues with starting transmission, to the group of CCN access points, of one or more pending interests associated with the mobile device. The method further includes detecting a handover completion event, and stopping, in response to detecting the handover completion event, the transmission of the one or more pending interests associated with the mobile device.