Multicast Unicast Virtual Cell Communication System
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Solution Overview
Problem
In wireless communication systems following IEEE 802.11 protocols, multicast packets are not reliably delivered, leading to potential loss of data, especially in high-traffic scenarios like streaming audio-video, where packet loss can cause noticeable disruptions.
Innovation Solution
The solution involves encapsulating multicast packets as subframes in aggregated MAC service data unit (A-MSDU) packets, which are then sent individually to each destination, ensuring reliable delivery without overwhelming the sender with acknowledgement messages and allowing for optimization of transmission parameters for each packet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast packets are sent to multiple destinations in IEEE 802.11 wireless communication systems, then the sender can transmit data to multiple recipients simultaneously, but the packets are not reliably delivered and may be lost without acknowledgment
Solution Approach 1:
The patent introduces an intermediary acknowledgment mechanism where the sender requests acknowledgments for multicast packets and individual destinations respond with ACK packets. This intermediary step ensures reliable delivery while maintaining multicast efficiency, resolving the contradiction between transmission efficiency and delivery reliability.
Solution Approach 2:
The patent implements a feedback mechanism where destinations send acknowledgment packets back to the sender to confirm receipt of multicast packets. This feedback loop enables the sender to detect lost packets and retransmit them, ensuring reliable delivery while maintaining the efficiency benefits of multicast transmission.
2Reliability
If ACK packets are required for every multicast packet, then reliable delivery can be ensured, but the sender would be flooded with acknowledgement messages
Solution Approach 1:
The patent segments the acknowledgment process by allowing the sender to selectively request acknowledgments for specific multicast packets rather than requiring ACKs for all packets. This segmentation reduces the flood of acknowledgment messages while maintaining reliability for critical transmissions.
Solution Approach 2:
The patent applies partial action by requiring acknowledgments only when necessary for reliable delivery, rather than for every single multicast packet. This selective approach ensures reliability when needed while avoiding the complexity and overhead of universal acknowledgment requirements.
3Use of energy by moving object
If multicast packets are used for streaming audio-video to large audiences, then bandwidth efficiency is improved, but packet loss causes noticeable disruptions in quality
Solution Approach 1:
The patent implements preliminary action by establishing an acknowledgment and retransmission mechanism before streaming begins. This allows the system to proactively ensure packet delivery and retransmit lost packets before they cause noticeable disruptions in streaming quality, maintaining both bandwidth efficiency and signal reliability.
Solution Approach 2:
The patent provides beforehand cushioning through the acknowledgment mechanism that detects and corrects packet loss before it impacts streaming quality. This cushioning layer ensures that even if some packets are lost during transmission, they can be recovered through retransmission, protecting the streaming signal quality while maintaining bandwidth efficiency.
Data Source
AI summary
Reliable multicast delivery in wireless communication, even when a WS doesn't know its AP, is determined at the AP without the sending device. Multicast packets are received at each AP having destinations. Without altering those packets, the AP encapsulates them in an A-MSDU packet. Each A-MSDU packet is sent individually to each destination, and might encapsulate more than one multicast packet. Destinations might receive two streaming messages faster than if sent separately. AP's might choose a 1st multiple of multicast packets from a 1st source, a 2nd, different, multiple of multicast packets from a 2nd source, and a single multicast packet from a 3rd source. Individualized optimization of transmission parameters for each A-MSDU packet and each multicast packet therein. Individualized optimization of transmission parameters for the A-MSDU packet for each destination. The AP collectively optimizes delivery of distinct multicast packets to different destinations.