Car2x Data Packet Filtering for V2X Network Load Reduction
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Solution Overview
Problem
Vehicle ad hoc networks face high computing resource demands due to varying data loads, particularly in high-traffic situations where many messages contain redundant or irrelevant information, leading to inefficient use of resources and increased computing effort.
Innovation Solution
The method filters data packets based on predetermined conditions such as reception field strength and priority, allowing for early identification of relevant messages and reducing computational effort by skipping unnecessary message unpacking and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all received data packets are processed and unpacked to evaluate message relevance, then message filtering accuracy is improved, but computing resource consumption increases
Solution Approach 1:
The patent applies preliminary action by evaluating filtering criteria at the data packet level before unpacking messages. The forwarding device assesses position data, reception field strength, and channel load conditions in advance, enabling early dismissal of obviously irrelevant packets without full message processing, thus reducing computing resources while maintaining filtering accuracy
Solution Approach 2:
The patent segments the filtering process into multiple stages: first evaluating data packet-level criteria (position, signal strength, channel load), then selectively unpacking only promising packets for message-level evaluation. This segmentation avoids the need to process all packets through the complete filtering chain, reducing overall computing burden
2Reliability
If computing resources are dimensioned for maximum channel load, then system reliability is improved, but resource efficiency deteriorates during normal operation
Solution Approach 1:
The patent implements dynamics by making the filtering threshold adaptive rather than static. The predetermined threshold for reception field strength is adjusted based on current channel load conditions - becoming more stringent when load is high and more permissive when load is low. This dynamic adjustment allows the system to maintain reliability under maximum load while improving resource efficiency during normal operation
3Quantity of substance
If data packets with redundant information are filtered out based on message content, then data load is reduced, but computing effort increases due to required unpacking
Solution Approach 1:
The patent applies preliminary action by extracting and evaluating position data from data packets before full message unpacking. By assessing position information, reception field strength, and channel load conditions in advance, the system can identify and filter out packets containing redundant information without investing the full computing effort required for complete message processing
Data Source
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AI summary
The invention relates to a method for relaying a data packet (43) containing at least positional data (16), said data packet being carried in a transmission signal (18) and received via a vehicular ad hoc network (1). The method comprises the following steps: filtering (47, 48) the received data packet (43) based on a predetermined filter condition (54); and relaying (42) the filtered data packet (50) to an additional receiver based on an identification (39) of whether the filtered data packet (50) should be relayed to the additional receiver.