Directed Multicast Service for WLAN Reliability
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Solution Overview
Problem
Current WLAN systems, particularly those operating in the 60 GHz band, face challenges in ensuring reliable multicast transmission and extending service coverage due to narrow service coverage and lack of error recovery mechanisms, leading to potential data loss and reduced throughput.
Innovation Solution
A method is introduced to process multicast frames by converting them into unicast frames, using a directed multicast service (DMS) that allows for sequence number mapping and termination, ensuring reliable transmission and discarding duplicate frames to optimize memory usage and prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multicast frames are transmitted in a WLAN system operating in the 60 GHz band, then service coverage can be extended, but transmission reliability deteriorates due to narrow service coverage and lack of error recovery mechanisms
Solution Approach 1:
The patent segments the multicast transmission process by introducing sequence numbers to divide the transmission into trackable units. Each multicast frame is assigned a sequence number, allowing the receiver to identify and request retransmission of specific lost frames rather than requiring complete retransmission of all data.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver monitors sequence numbers of received multicast frames and sends feedback information to the transmitter when frames are lost. This feedback loop enables the transmitter to retransmit only the specific frames that were not successfully received, improving reliability without sacrificing coverage.
2Reliability
If duplicate multicast frames are processed, then data redundancy is created, but memory usage increases and system overload occurs
Solution Approach 1:
The patent enables the receiver to automatically detect duplicate multicast frames through sequence number comparison and self-filter them without requiring external intervention. The system monitors incoming frames, compares sequence numbers with previously received frames, and automatically discards duplicates, preventing memory overload while maintaining reliable data reception.
3Productivity
If multicast transmission is used without error recovery mechanisms, then data transfer rate is maintained, but data loss occurs
Solution Approach 1:
The patent applies preliminary action by pre-assigning sequence numbers to multicast frames before transmission. This allows the receiver to proactively detect missing or duplicate frames based on sequence number gaps or repetitions, enabling error recovery without interrupting the overall data transfer rate significantly.
Data Source
AI summary
A method of processing a multicast frame in a wireless local area network system. The method includes transmitting a request message for requesting a Directed Multicast Service (DMS) in which at least one multicast frame is transmitted as at least one unicast frame by an Access Point (AP), receiving a response message from the AP in response to the request message, and receiving the at least one multicast frame from the AP, the at least one multicast frame being transmitted as the at least one unicast frame. The request message includes a DMS descriptor list field comprising a Transmission Class (TCLAS) element field and a Transmission Specification (TSPEC) element field. The TCLAS element field includes a requested multicast group address for the DMS. The TSPEC element field defines Quality of Service (QoS) expectations information for the DMS.