Threshold-Based Multicast Retransmission Control
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Solution Overview
Problem
In wireless communication systems, the existing multicast communication technique leads to frequent retransmissions as the number of wireless terminals in a multicast group increases, resulting in inefficient use of wireless resources and excessive consumption.
Innovation Solution
A wireless communication apparatus and method that sets a threshold for determining the necessity of retransmission based on reception acknowledgment responses from terminals, allowing for more efficient utilization of wireless resources by assuming successful multicast transmission when a portion of terminals acknowledge, thereby reducing unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission is performed until reception acknowledgment responses are received from all terminals, then reliability of multicast transmission is improved, but wireless resources are excessively consumed
Solution Approach 1:
The patent applies partial action by setting a threshold value (e.g., 80% or 90%) of the total number of terminals as the target for retransmission termination. Instead of requiring 100% acknowledgment from all terminals, the system stops retransmission when the threshold is reached, achieving sufficient reliability while avoiding excessive wireless resource consumption that would occur with complete terminal coverage.
2Reliability
If retransmission is repeatedly performed until all terminals acknowledge reception, then delivery completeness is improved, but retransmission frequency increases with more terminals
Solution Approach 1:
The system performs partial retransmission by targeting only the threshold percentage of terminals rather than all terminals. This reduces retransmission frequency and improves productivity while maintaining acceptable delivery completeness for the majority of terminals.
Solution Approach 2:
The patent changes the parameter from 'number of acknowledged terminals' to 'threshold value' which represents a percentage or fixed number. This parameter change transforms the retransmission control mechanism from a binary all-or-nothing approach to a flexible threshold-based approach, improving system efficiency.
3Loss of energy
If threshold-based retransmission control is implemented, then wireless resource utilization is improved, but complexity of retransmission control increases
Solution Approach 1:
The patent introduces a threshold parameter that simplifies control logic compared to complex adaptive algorithms. By using a fixed or dynamically adjustable threshold value, the system achieves efficient resource utilization without requiring complex decision-making mechanisms, maintaining relatively simple control structure.
Data Source
AI summary
To make it possible to perform retransmission control in which wireless resources are more efficiently utilized, a wireless communication apparatus includes: a wireless communication unit configured to perform wireless communication with a terminal apparatus; a communication control unit configured to control multicast transmission performed by the wireless communication unit; and a setting unit configured to set a threshold for determining whether or not it is necessary for the communication control unit to perform a retransmission process, on the basis of information about reception of a reception acknowledgment response corresponding to the multicast transmission from the terminal apparatus.