Base Station Network Coding for Vehicle Communication Reliability
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Solution Overview
Problem
Current vehicle-to-vehicle communication systems face challenges with reliability and latency, especially in high vehicle density scenarios, and require higher data rates than supported by IEEE 802.11p or Rel-14 LTE, necessitating techniques that combine direct vehicle-to-vehicle and infrastructure-to-vehicle communication effectively.
Innovation Solution
A base station apparatus and method that generates composite messages using network coding, selects messages based on measurements and negative acknowledgments, and transmits them to recreate missed messages, reducing network load and improving reliability without proportional overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If direct vehicle-to-vehicle communication link is used to meet latency requirements, then latency is reduced, but reliability deteriorates in high vehicle density scenarios
Solution Approach 1:
The base station serves as an intermediary that receives messages from vehicles, performs network coding to generate composite messages, and transmits them back to vehicles. This mediator approach allows vehicles to recover missed messages through cooperative decoding, improving reliability without increasing direct communication overhead, while maintaining low latency through efficient message recovery mechanisms.
Solution Approach 2:
The system changes the parameter of message representation by applying network coding transformations to original messages, creating composite messages that contain encoded information from multiple sources. This parameter change enables vehicles to reconstruct original messages through mathematical decoding operations, enhancing reliability in high-density scenarios where direct message reception may fail.
2Reliability
If techniques such as low order modulation, low code rate, and retransmissions are employed to improve reliability on the vehicle-to-vehicle link, then reliability is improved, but system capacity and efficiency deteriorate
Solution Approach 1:
Instead of using inefficient low-order modulation and retransmissions, the system creates encoded copies (composite messages) of original messages through network coding. These composite messages contain redundant information that allows vehicles to recover original messages without requiring multiple retransmissions, thereby maintaining high system capacity while improving reliability.
3Reliability
If more composite messages are transmitted to improve message recovery capability, then reliability is improved, but network overhead increases proportionally
Solution Approach 1:
The base station transmits a limited number of composite messages that are sufficient for vehicles to recover their missed messages through cooperative decoding. This partial action approach avoids transmitting excessive redundant messages, maintaining low network overhead while achieving the necessary reliability for message recovery in high-density vehicle scenarios.
Data Source
AI summary
An apparatus and method are provided for supporting vehicle-to-vehicle communication utilizing a base station. Included is a vehicular network interface configured to receive, from a first subset of a set of vehicles, first messages. The vehicular network interface is further configured to receive composite messages that are generated by a base station based on second messages transmitted by a second subset of the set of vehicles. Also included is circuitry in communication with the vehicular network interface. The circuitry is configured to re-create at least a portion of the second messages based on at least a portion of the first messages and at least a portion of the composite messages.