Wireless Audio Video Message Exchange Round Trip Time Test
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Solution Overview
Problem
Current wireless networks face challenges in efficiently transmitting high-speed audio/video (A/V) data in a wireless mode due to difficulties in processing A/V data as general data at the physical layer, leading to issues with message loss and inefficient routing path performance testing.
Innovation Solution
A method is introduced to perform a round trip time (RTT) test through specific message exchange between user devices, using an echo request/command mechanism to identify devices and coordinate message transmission intervals based on predicted maximum transmission capacity, thereby reducing message loss and optimizing wireless routing paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A/V data is transmitted as general data through wireless network, then wireless transmission is enabled, but transmission reliability deteriorates due to message loss
Solution Approach 1:
The patent segments A/V data transmission into multiple small data units rather than transmitting as a single general data stream. This segmentation allows for individual acknowledgment of each data unit, enabling reliable transmission over wireless networks by tracking and retransmitting only lost segments.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving device sends acknowledgment messages back to the transmitting device for each received data unit. This feedback loop enables the transmitting device to detect message loss and retransmit undelivered data, thereby improving transmission reliability while maintaining wireless transmission capability.
2Ease of operation
If high-speed A/V data transmission is performed in wireless mode, then cable requirements are reduced, but message loss increases due to throughput overflow
Solution Approach 1:
The patent employs periodic transmission of data units with interleaved acknowledgment requests. By periodically pausing data transmission to send and receive acknowledgments, the system prevents throughput overflow that causes message loss, while still enabling cable-free wireless operation.
Solution Approach 2:
The transmitting device performs preliminary actions by sending data units one at a time and waiting for acknowledgments before proceeding to the next unit. This preliminary step-by-step approach prevents overwhelming the wireless channel and causes message loss, while maintaining the ease of wireless operation.
3Reliability
If RTT testing is performed through message exchange, then routing path performance is improved, but message exchange overhead increases
Solution Approach 1:
The patent makes the data units serve multiple functions: they carry A/V data, enable acknowledgment feedback, and provide RTT measurement capability. By making data units universal and multi-functional, the patent achieves routing path performance improvement without adding separate overhead messages for each function.
Solution Approach 2:
The patent merges RTT testing functionality with the existing data transmission message exchange. The same messages used for data delivery and acknowledgment are also used to measure round-trip time, thereby improving routing path performance without increasing message exchange overhead.
Data Source
AI summary
A method of exchanging a round trip time between a transmitting device and a receiving device in a wireless network comprises receiving an echo request command from an audio video control (AVC) layer to a medium access control (MAC) layer, the echo request command including a first identifier for identifying the transmitting device, a second identifier for identifying the receiving device, and a third identifier; transferring a MAC message from the MAC layer to a physical layer, the MAC message including a message preamble, a message type, and the echo request command; transmitting a first physical layer data unit to the receiving device, the first physical layer data unit including at least one header, the MAC message, and audio/video (A/V) data; and receiving a second physical layer data unit from the receiving device, the second physical layer data unit including an echo report command in response to the echo request command, the echo report command including the third identifier.