Selective Packet Deletion in Vehicular Networks
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Solution Overview
Problem
In vehicular communication networks, vehicles face challenges in determining whether to store, forward, or delete received data packets due to limited storage capacity and redundant broadcasts, with existing methods not effectively addressing the decision-making process for packet management.
Innovation Solution
A method where vehicles evaluate conditions such as packet duplication, proximity to the destination, staleness, and storage capacity to decide whether to delete data packets, using ratios of current and original routes and storage time to determine which packets to prioritize or discard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicles store all received data packets, then data delivery reliability is improved, but storage capacity is exhausted
Solution Approach 1:
The patent implements selective deletion of data packets based on evaluation criteria including distance ratios, packet age, and storage status. Vehicles discard packets that have been delivered or are unlikely to reach their destination, recovering storage capacity while maintaining delivery reliability for critical packets. The system recovers storage space by identifying and deleting redundant or stale packets.
Solution Approach 2:
The patent changes the state of data packets from static storage to dynamic evaluation based on multiple parameters: distance ratio (current distance/original distance), packet age, storage status, and delivery confirmation. These parameter changes enable intelligent decision-making about which packets to retain or delete, resolving the contradiction between reliability and storage capacity.
2Reliability
If vehicles forward all received data packets, then data delivery coverage is improved, but network redundancy increases
Solution Approach 1:
The patent applies partial action by selectively forwarding only those data packets that meet specific criteria rather than forwarding all packets. Vehicles evaluate distance ratios, packet importance, and network conditions to determine which packets warrant forwarding, reducing unnecessary network traffic while maintaining adequate delivery coverage.
Solution Approach 2:
The patent implements feedback mechanisms where vehicles receive delivery confirmation notifications from destinations. When a packet is successfully delivered, the source vehicle and other vehicles are notified, providing feedback that eliminates the need to continue forwarding that packet, thereby reducing network redundancy while maintaining delivery coverage.
3Quantity of substance
If vehicles delete data packets early, then storage burden is reduced, but data delivery reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by evaluating and marking data packets for deletion before actual deletion occurs. The system calculates distance ratios, checks packet age, and determines delivery status in advance, making informed decisions about which packets can be safely deleted. This preliminary evaluation ensures that packets critical for delivery are retained while reducing storage burden for non-critical packets.
Solution Approach 2:
The patent replaces simple mechanical storage (keeping all packets) with an intelligent evaluation system that uses distance ratio calculations, timestamp analysis, and delivery confirmation checking. This substitution enables automated, reliable decisions about packet retention and deletion, reducing storage burden while maintaining delivery reliability through systematic evaluation rather than arbitrary deletion.
Data Source
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AI summary
Methods, systems, and devices are described for storing and deleting received data packets over combined vehicular and wireless communications networks. In one example, an apparatus in a vehicular communication network may receive a data packet and may determine whether to store or delete the received data packet based on a ratio of distances between the data packet and its destination address as well as the data packet's source address and its destination address.