Visible Light Communication Fast Feedback Slot for Rapid Retransmission
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Solution Overview
Problem
Momentary data transmission/reception failures occur frequently in wireless LAN systems using visible light communication due to signal directivity and obstacles, leading to a need for immediate recognition and rapid retransmission of failed data.
Innovation Solution
A method and apparatus that enable a mobile node to search for and utilize a fast feedback slot with mini-slots to transmit retransmission information to an access point, allowing for rapid retransmission of failed data without additional resource allocation procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If visible light communication is used for wireless LAN, then data transmission can be achieved using existing LED lighting infrastructure, but momentary data transmission/reception failures occur frequently due to signal directivity and obstacles
Solution Approach 1:
The patent implements a feedback mechanism where the mobile node monitors reception quality and sends feedback information to the access point when transmission failures are detected. This allows the system to adapt to channel conditions and trigger retransmission operations, resolving the reliability issue while maintaining the use of existing LED infrastructure
2Reliability
If traditional retransmission protocols are used, then data can be retransmitted, but the process is slow and does not meet real-time communication requirements
Solution Approach 1:
The patent prepares retransmission resources in advance by allocating specific time slots and frequency resources for retransmission operations. When transmission failures occur, the pre-prepared resources enable immediate retransmission without waiting for resource allocation procedures, significantly reducing retransmission delay
Solution Approach 2:
The patent changes the timing parameters of communication by introducing shortened transmission time intervals and adjusted slot structures specifically for retransmission operations. This parameter optimization enables faster retransmission cycles that meet real-time communication requirements
3Loss of time
If fast feedback slots with mini-slots are implemented, then rapid retransmission is enabled, but the system complexity increases
Solution Approach 1:
The patent segments the feedback slot into multiple mini-slots, each capable of carrying feedback information independently. This segmentation allows the system to achieve fast retransmission by utilizing individual mini-slots while maintaining overall protocol structure through standardized segmentation rules, balancing speed improvement with manageable complexity
Data Source
AI summary
A method for retransmitting data when data transmission/reception has failed in a wireless LAN system using visible light communication. A mobile node searches a received frame for a fast feedback slot allocated for retransmission information when momentary data transmission/reception failure has occurred. One mini-slot from among the plurality of mini-slots is selected from the fast feedback slot. The mobile node transmits a fast feedback message, including information for retransmission, to an access point by using the selected mini-slot.