Multicast Retransmission via Candidate Terminal Selection
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Solution Overview
Problem
In wireless communication networks, multicast packet transmission is hindered by packet errors and varying channel states, which restrict the transmission range and efficiency due to the need for error correction and feedback mechanisms.
Innovation Solution
A communication method where an access point selects a candidate terminal to retransmit multicast packets based on channel probe messages with different data rates, prioritizing terminals with better channel conditions to enhance retransmission efficiency and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multicast packets are transmitted through wireless channels to all terminals, then the transmission range is extended, but packet errors increase due to varying channel states
Solution Approach 1:
The patent segments the multicast transmission process into initial transmission by the access point and retransmission by selected terminal devices. This segmentation allows the system to extend transmission range through terminal devices while maintaining reliability by having the access point retransmit packets to terminals that fail to receive them correctly.
Solution Approach 2:
The patent introduces terminal devices as intermediary nodes that receive and retransmit multicast packets. These intermediary terminals help extend the transmission range to distant terminals while the access point acts as a mediator to ensure reliable delivery by retransmitting to terminals with poor reception.
2Reliability
If error correction and feedback mechanisms are implemented for multicast transmission, then packet reliability is improved, but transmission efficiency decreases due to additional overhead
Solution Approach 1:
The patent implements a self-service mechanism where terminal devices that successfully receive multicast packets autonomously retransmit them to other terminals. This eliminates the need for centralized error correction and feedback mechanisms, thereby improving transmission efficiency while maintaining reliability through distributed retransmission.
3Area of stationary object
If all terminals attempt to retransmit multicast packets simultaneously, then retransmission coverage is maximized, but channel contention and collisions increase
Solution Approach 1:
The patent applies local quality by selecting specific terminal devices based on their individual channel conditions to perform retransmission. Terminals with better reception quality are selected to retransmit, which maximizes retransmission coverage while minimizing channel contention, as fewer carefully selected terminals are involved compared to all terminals attempting simultaneous retransmission.
Data Source
AI summary
A communication method of an access point (AP) for retransmission of a multicast packet in a network including the AP and terminals, includes selecting a candidate terminal to be used to retransmit the multicast packet, from the terminals, and retransmitting the multicast packet, using the candidate terminal.