Dynamic Multicast-to-Unicast Switching for WLAN Packet Loss
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Solution Overview
Problem
In wireless local area networks (WLANs), multicast packets are prone to loss due to poor network conditions, and existing methods to mitigate this, such as converting them into unicast packets, consume significant resources and reduce transmission efficiency.
Innovation Solution
A method where an access point (AP) dynamically switches the packet transmission mode of multicast groups between multicast-to-unicast and multicast transmission based on the packet cache queue threshold, prioritizing efficiency and quality by converting packets when the queue exceeds or falls below certain thresholds, and preferentially selecting groups with more terminals for improved resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast packets are converted into multiple unicast packets for transmission, then packet loss is reduced due to retransmission mechanism, but resource consumption increases significantly
Solution Approach 1:
The patent implements dynamic switching between multicast transmission mode and unicast transmission mode based on real-time network conditions and packet cache queue status. When network conditions are good and queue is not full, multicast mode is used for efficiency. When packet loss occurs or queue needs management, unicast mode with retransmission is activated, thus dynamically optimizing the trade-off between reliability and resource consumption.
Solution Approach 2:
The system changes transmission parameters (transmission mode, packet replication count) based on monitored conditions such as packet cache queue depth and network quality. By adjusting these parameters dynamically, the system achieves reliable transmission only when necessary, reducing overall resource consumption while maintaining required reliability levels.
2Use of energy by moving object
If multicast packets are sent in multicast transmission mode, then resource consumption is reduced, but packet loss increases under poor network conditions
Solution Approach 1:
The access point acts as an intermediary that monitors network conditions and packet cache status, then intelligently selects transmission mode. It converts multicast packets to unicast packets with retransmission capability when reliability is needed, while maintaining multicast efficiency when conditions permit, thus mediating between resource consumption and reliability requirements.
Solution Approach 2:
The transmission mode is dynamically adjusted based on real-time monitoring of network conditions and packet cache queue depth. The system transitions from static multicast transmission to adaptive mode selection, ensuring reliability improvements only when network conditions deteriorate or queue management requires intervention.
3Reliability
If multiple unicast packets are sent separately to reduce multicast packet loss, then transmission reliability improves, but transmission efficiency decreases
Solution Approach 1:
The system dynamically selects between multicast and unicast transmission modes based on packet cache queue depth and network conditions. When queue is not full and network is good, efficient multicast mode is used. When queue management or reliability is prioritized, unicast mode with retransmission is employed, thus dynamically balancing efficiency and reliability.
Solution Approach 2:
Transmission parameters including mode selection and packet replication are changed based on monitored system state. This parameter adaptation allows the system to achieve reliable transmission only when necessary, maintaining high transmission efficiency under normal conditions while ensuring reliability when needed.
Data Source
AI summary
A method for setting a packet transmission mode and a device are provided, and relate to the communications field. To optimize sending of a multicast packet, both robustness and resource consumption are considered. A specific solution is as follows: when a packet amount in a packet cache queue exceeds a first threshold, changing a state of a first multicast group to multicast transmission, where a state that is of the first multicast group and that is before the change is multicast-to-unicast transmission. Technical solutions of this disclosure are used for setting a packet transmission mode.