Wireless Access in Vehicular Environments WSA Message Transmission Mode Selection
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Solution Overview
Problem
The coexistence of IEEE 802.11p and IEEE 802.11bd terminals in a wireless LAN network poses challenges due to differences in data reception modes, leading to inefficient service advertisement message transmission and resource management.
Innovation Solution
A communication node identifies the number of terminals in different reception modes and determines a transmission mode and period for Wireless Access in Vehicular Environments (WSA) messages, adjusting the transmission periods based on the ratio of these modes to efficiently transmit WSA messages and manage control channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WSA messages are transmitted using a fixed protocol and period, then legacy terminals (IEEE 802.11p) can receive messages reliably, but new terminals (IEEE 802.11bd) experience reception failures due to protocol incompatibility
Solution Approach 1:
The patent implements dynamic transmission mode selection where the base station adapts its message transmission protocol based on the reception capabilities of terminals in the coverage area. The system transitions from a static, fixed-protocol approach to a dynamic one that adjusts between legacy mode (for IEEE 802.11p terminals) and new mode (for IEEE 802.11bd terminals) based on real-time terminal composition, thereby resolving the contradiction between reliability for specific terminals and adaptability to different terminal types.
Solution Approach 2:
The patent changes the transmission parameter (protocol mode) based on the reception mode distribution of terminals. The base station monitors the types of terminals present and adjusts the WSA message transmission parameters accordingly - using legacy protocol when IEEE 802.11p terminals dominate, and new protocol when IEEE 802.11bd terminals are present, thus achieving both reliability and adaptability.
2Productivity
If WSA messages are transmitted frequently to ensure new terminals receive messages, then message delivery to IEEE 802.11bd terminals improves, but control channel resources are wasted for legacy terminals that cannot receive these messages
Solution Approach 1:
The patent applies local quality by transmitting different types of WSA messages targeted at specific terminal groups. Instead of uniform transmission to all terminals, the system transmits legacy-mode messages to legacy terminals and new-mode messages to new terminals, with each transmission optimized for its target audience. This eliminates resource waste on incompatible terminals while ensuring efficient delivery to compatible terminals.
Solution Approach 2:
The patent uses partial action by transmitting only the necessary subset of messages for each terminal type present. When only legacy terminals are detected, only legacy-mode messages are transmitted; when new terminals are detected, new-mode messages are transmitted. This avoids the excessive transmission of messages that would be useless to certain terminal types, optimizing resource utilization.
3Reliability
If the transmission protocol is optimized for new terminals (IEEE 802.11bd), then message reception for new terminals improves, but legacy terminals (IEEE 802.11p) cannot receive messages at all
Solution Approach 1:
The patent implements multi-functionality by enabling the base station to perform multiple transmission mode operations. The WSA message transmission mechanism can function in both legacy mode and new mode, selecting the appropriate mode based on terminal composition. This universal capability allows the system to serve both IEEE 802.11p and IEEE 802.11bd terminals effectively, achieving high reception success rates for whichever terminal type is present without sacrificing compatibility.
Data Source
AI summary
An operation method of a first communication node in a communication network identifies a number of second communication nodes receiving messages in a first reception mode and a number of third communication nodes receiving messages in a second reception mode. A transmission mode is determined for transmitting a wireless access in vehicular environments service advertisement (WSA) message based on the identified numbers. A transmission period is then determined for transmitting the WSA message based on the transmission mode. The WSA message is transmitted based on the transmission mode and the transmission period. A protocol used for the first reception mode is different from a protocol used for the second reception mode.