Wireless Multicast Reliability via Feedback and Segmentation
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Solution Overview
Problem
Current multicast transmission methods in wireless communication networks lack reliability due to the absence of acknowledgement signals, leading to data loss, inability to request retransmissions, and inefficient modulation methods, especially when receivers have different communication environments.
Innovation Solution
A wireless communication apparatus with a controller that manages data transmission by using acknowledgement signals to ensure reliable delivery, retransmitting data upon errors, and dynamically adjusting modulation methods based on receiver communication states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multicast transmission is performed without acknowledgement signals to simplify the transmission process, then device complexity is reduced, but data reliability deteriorates due to data loss and inability to request retransmission
Solution Approach 1:
The patent introduces an acknowledgement (ACK) signal feedback mechanism where receivers send ACK signals to the transmitter to confirm successful data reception. This feedback loop enables the transmitter to verify delivery status and request retransmission when necessary, thereby resolving the contradiction between simplified transmission and reliable data delivery.
2Adaptability or versatility
If the lowest modulation method is used to ensure all receivers can decode data, then adaptability to different communication environments is improved, but transmission efficiency deteriorates due to inability to use higher modulation methods
Solution Approach 1:
The patent segments the multicast group into multiple subgroups based on receiver communication capabilities and channel conditions. Different modulation schemes are assigned to different subgroups, allowing each receiver to receive data at the appropriate modulation level while maintaining overall system efficiency. This resolves the contradiction by enabling differentiated transmission strategies for different receivers.
Solution Approach 2:
The patent dynamically changes transmission parameters including modulation scheme, coding rate, and transmission power based on receiver feedback and channel conditions. This allows the system to adapt transmission characteristics to match receiver capabilities and environmental conditions, thereby improving both adaptability and transmission efficiency simultaneously.
3Productivity
If simultaneous transmission to multiple receivers is performed to improve productivity, then data transmission speed is improved, but harmful factors increase due to wireless collisions between terminals
Solution Approach 1:
The patent implements periodic transmission cycles with distinct phases: data transmission phase, ACK reception phase, and retransmission phase. By separating these operations in time, the system enables simultaneous transmission to multiple receivers while preventing collisions through structured timing and phased operations.
Data Source
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AI summary
A wireless communication apparatus includes a communicator which can transmit and receive data; and a controller which controls the communicator to transmit information about transmission of data to a plurality of receivers if the data is received from a transmitter, transmit the data to the plurality of receivers, and retransmit the data to the plurality of receivers if a response signal about error in receiving the data is received from at least one among the plurality of receivers.