Vehicular Message Delivery via Adaptive Broadcast and Unicast
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Solution Overview
Problem
Current wireless communication systems for vehicular networks face challenges in reliably and efficiently transmitting messages to multiple vehicles, as broadcast transmissions may fail due to varying channel quality and lack of individual feedback, while unicast transmissions are resource-intensive and prone to over-delivery.
Innovation Solution
A method to dynamically and adaptively combine cell-level broadcast and user terminal-level unicast transmission schemes, using proactive and reactive unicast approaches to maximize message reception reliability and resource efficiency by estimating the number of vehicles that can receive broadcast messages and selectively using unicast for those that cannot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If broadcast transmission is used to send messages to multiple vehicles, then resource efficiency is improved, but message delivery reliability deteriorates due to varying channel quality and lack of individual feedback
Solution Approach 1:
The patent segments the message delivery process into two distinct phases: a broadcast phase for efficient resource utilization and a unicast phase for reliable delivery to specific vehicles. The base station divides the recipient set into a first set (receiving broadcast) and a second set (receiving unicast), thereby resolving the contradiction between resource efficiency and delivery reliability
Solution Approach 2:
The patent implements dynamic adaptation by using feedback information from vehicles to dynamically determine which vehicles should receive broadcast messages and which should receive unicast messages. This dynamic adjustment allows the system to optimize the balance between resource efficiency and message delivery reliability based on real-time channel conditions
2Reliability
If unicast transmission is used to ensure reliable message delivery to each vehicle, then message delivery reliability is improved, but resource consumption increases significantly
Solution Approach 1:
The patent segments the recipient vehicles into two groups: a first set that receives messages via broadcast and a second set that receives messages via unicast. This segmentation allows the system to apply the most appropriate transmission mode to each group, improving overall resource efficiency while maintaining reliability for vehicles that need it
Solution Approach 2:
Instead of applying unicast to all vehicles (excessive action), the patent applies unicast only partially to the second set of vehicles that specifically need it based on feedback information. This partial application of unicast reduces resource consumption while still ensuring reliable delivery where necessary
3Reliability
If unicast transmission is used for all vehicles, then individual message delivery is ensured, but over-delivery occurs and resource waste increases
Solution Approach 1:
The patent introduces a feedback mechanism where vehicles send feedback information to the base station about their reception status. This feedback is used to determine which vehicles should receive unicast messages, preventing over-delivery to vehicles that have already successfully received the broadcast message and thereby reducing resource waste
Data Source
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Figure 3~5A
Figure 4~5B
AI summary
Apparatuses and methods in a communication system are provided. The solution for transmitting a message for multiple vehicular recipients comprises determining (200) the vehicular recipients of the message in one or more coverage areas; estimating (202) the amount of resources needed in transmission the message using broadcast or separate unicast messages or the number of vehicular recipients that cannot receive broadcast message, or both, and transmitting (204) the message either as a single broadcast message to the vehicular recipients in each coverage area or as a unicast message separately to each vehicular recipient or both, depending on the amount of resources needed in transmission or the number of vehicular recipients that cannot receive the broadcast message, or both.