Message Conversion Apparatus for Cross-Subnet WAVE/DSRC Transmission
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Solution Overview
Problem
In wireless communication environments, especially in WAVE/DSRC, vehicles face communication interruptions and poor quality due to the need to constantly change subnets, and existing protocols like TCP/UDP restrict point-to-point transmissions within the same subnet, while WSMP provides flexibility but lacks reliability.
Innovation Solution
A message conversion apparatus and method that converts TCP/UDP packets into dedicated protocol packets, such as WSMP, allowing for reliable and flexible point-to-point transmissions across subnets by using conversion rules to modify packet headers and identifiers, enabling transmission across different protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCP/UDP protocol is used for data transmission in WAVE/DSRC environment, then reliable transmission can be achieved, but communication interruptions occur due to subnet changes when vehicles move
Solution Approach 1:
The patent introduces a gateway device as an intermediary between TCP/UDP-based infrastructure networks and WSMP-based vehicular networks. The gateway performs protocol conversion, receiving TCP/UDP packets from infrastructure, converting them to WSMP format, and transmitting to vehicles. This mediator resolves the contradiction by allowing reliable TCP/UDP transmission through the gateway while enabling subnet flexibility through WSMP's broadcast mechanism.
Solution Approach 2:
The patent changes the communication parameter from unicast (TCP/UDP) to broadcast (WSMP) for vehicular communications. By converting the transmission mode parameter, the system achieves subnet flexibility where vehicles can communicate without being restricted to the same subnet, while the gateway maintains transmission reliability through protocol conversion and acknowledgment mechanisms.
2Adaptability or versatility
If WSMP protocol is used for data transmission in WAVE/DSRC environment, then subnet flexibility and communication quality are improved, but transmission reliability cannot be guaranteed
Solution Approach 1:
The gateway acts as a mediator that receives WSMP broadcast packets from vehicles, converts them to TCP/UDP format, and transmits through the infrastructure network. This intermediary function provides reliability by using TCP/UDP's acknowledged transmission mechanism while preserving WSMP's subnet flexibility for vehicle-to-vehicle communications.
Solution Approach 2:
Instead of making vehicles adapt to infrastructure subnets (traditional approach), the patent inverts the approach by having the gateway adapt to vehicle subnets. The gateway joins vehicle ad-hoc networks and receives WSMP broadcasts, then converts them for infrastructure transmission, thereby maintaining vehicle subnet flexibility while achieving reliable transmission.
3Ease of operation
If TCP/UDP module is used for transmission, then application program design framework remains unchanged, but transmission delay increases due to subnet restriction checks
Solution Approach 1:
The gateway serves as an intermediary that handles all subnet determination and protocol conversion operations, shielding application programs from these complexities. Applications simply send data to the gateway using standard TCP/UDP interfaces, and the gateway manages the time-consuming subnet checks and WSMP conversions in the background, thereby maintaining application compatibility while reducing perceived transmission delay.
Solution Approach 2:
The gateway performs preliminary actions by pre-joining vehicle ad-hoc networks and establishing WSMP communication channels before actual data transmission is needed. This preliminary setup eliminates the need for runtime subnet checks and protocol conversions during urgent vehicle communications, thereby reducing transmission delay while maintaining application compatibility.
4Reliability
If point-to-point transmission within same subnet is required by IP protocol, then transmission reliability is maintained, but communication flexibility between different subnets is restricted
Solution Approach 1:
The gateway acts as an intermediary that bridges different subnets. It receives point-to-point TCP/UDP packets from infrastructure in one subnet, converts them to WSMP broadcast format, and transmits to vehicles in different subnets. This mediator approach maintains the reliability of point-to-point transmission for infrastructure communications while enabling cross-subnet flexibility through WSMP's broadcast capability.
Solution Approach 2:
The patent segments the communication system into two distinct layers: infrastructure-to-gateway communication using reliable point-to-point TCP/UDP within the same subnet, and gateway-to-vehicle communication using flexible broadcast WSMP across different subnets. This segmentation allows each layer to use the most appropriate protocol for its specific requirements, maintaining reliability where needed and flexibility where beneficial.
Data Source
AI summary
A message conversion apparatus, a message transmission system, a message transmission method and a computer program product thereof are provided. The message transmission system comprises a first message conversion apparatus and a second message conversion apparatus. The first message conversion apparatus is configured to receive a TCP/UDP packet, convert the TCP/UDP packet into a dedicated protocol packet according to a first conversion rule and transmit the dedicated protocol packet. The second message conversion apparatus communicates with the first message conversion apparatus. The second message conversion apparatus is configured to receive the dedicated protocol packet and convert the dedicated protocol packet into the TCP/UDP packet according to a second conversion rule.