Segmented D2D Message Transmission for V2X Resource Efficiency
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Solution Overview
Problem
Conventional D2D discovery messages are not suitable for use cases where information transmitted frequently changes, leading to increased radio resource overhead and inefficiency, particularly in high-speed V2X applications.
Innovation Solution
A user apparatus is designed to generate and transmit messages with multiple segments, where the first segment's information remains unchanged within a predetermined period, allowing for efficient transmission and reception of messages even when information changes frequently, by separating the transmission periods of discovery signals and messages and using a message generating unit to create a message with a first and second segment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If D2D discovery messages including information are transmitted in short periods to measure radio quality frequently, then measurement accuracy is improved, but radio resource overhead increases
Solution Approach 1:
The message is divided into a first segment containing unchanged information and a second segment containing frequently changing information. This segmentation allows the first segment to be transmitted less frequently while the second segment is transmitted frequently, achieving accurate radio quality measurement without proportionally increasing overall message overhead.
Solution Approach 2:
The message transmission is structured with periodic intervals where the first segment is transmitted at longer intervals since its information does not change frequently, while the second segment is transmitted at shorter intervals to capture frequent changes. This periodic action pattern reduces overall transmission overhead while maintaining measurement accuracy.
2Loss of information
If information is transmitted frequently to capture rapid changes in V2X applications, then information freshness is improved, but radio resource overhead increases
Solution Approach 1:
The message is segmented into a first segment for stable information and a second segment for frequently changing information. This allows differential transmission strategies where the second segment is transmitted frequently to maintain information freshness, while the first segment is transmitted less frequently, reducing overall resource overhead.
Solution Approach 2:
Different parts of the message have different transmission qualities/frequencies based on their change characteristics. The second segment containing frequently changing information is transmitted with higher frequency and priority, while the first segment with stable information uses lower frequency transmission, optimizing resource usage according to local information characteristics.
Data Source
AI summary
A user apparatus in a radio communication system supporting a D2D technology, includes a message generating unit configured to generate a message including a first segment and a second segment; and a message transmitting unit configured to transmit, multiple times, the message within a predetermined period, wherein information reported by a plurality of the first segments transmitted within the predetermined period by the message transmitting unit, is not changed within the predetermined period.