Multicast to Unicast Conversion Gateway for Wireless Reliability
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Solution Overview
Problem
Multicast data transmission over wireless networks is not as reliable as unicast data transmission due to limitations in existing techniques, which result in reduced bandwidth efficiency and difficulty in satisfying varying radio link qualities among multiple receivers.
Innovation Solution
An application layer method and apparatus for converting multicast data to unicast data in wireless local area networks, involving session description retrieval, state information management, and address conversion to ensure reliable delivery of multicast data packets to receivers, utilizing a media gateway with dual IP addresses for external and internal communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If application layer error control techniques such as FEC and resilience video coding are used for multicast transmissions, then the reliability of multicast video transmission is improved, but the bandwidth efficiency is reduced due to high overhead
Solution Approach 1:
The patent introduces a media gateway as an intermediary device that performs multicast-to-unicast conversion. The gateway receives multicast data packets from the wired network and converts them to unicast packets for wireless transmission to individual receivers. This intermediary approach allows the system to leverage reliable unicast transmission mechanisms (ARQ, retransmissions) at the link layer while avoiding the high overhead of application-layer FEC, thus resolving the contradiction between reliability and bandwidth efficiency.
2Productivity
If multicast data packets are transmitted directly over wireless networks, then the network resource utilization is efficient, but the transmission reliability is reduced compared to unicast data packets
Solution Approach 1:
The patent segments the multicast transmission into two distinct parts: (1) multicast transmission over the wired network to the media gateway, and (2) unicast transmission over the wireless network from the gateway to individual receivers. This segmentation allows each part to use the most appropriate transmission mode - efficient multicast for the shared wired medium and reliable unicast for the wireless links with varying channel qualities - thereby resolving the contradiction between network efficiency and transmission reliability.
3Reliability
If the same video stream is sent from the streaming server to multiple homes or multiple receivers in a home in unicast, then the transmission reliability is improved, but the network resources such as bandwidth in the wired DSL network are consumed increased
Solution Approach 1:
The patent merges multiple unicast streams into a single multicast stream for transmission over the wired network. The media gateway receives a single multicast stream from the streaming server and then distributes it to multiple receivers via unicast wireless transmissions. This merging approach eliminates redundant transmissions over the wired DSL network, significantly reducing bandwidth consumption while maintaining the reliability benefits of unicast transmission over the wireless links.
Data Source
AI summary
A method and apparatus are described including mapping a multicast connection to a unicast uniform resource identifier, establishing a state for a multicast-to-unicast conversion, allocating ports, receiving multicast addressed data packets and converting the multicast addressed data packets to unicast addressed data the packets.