Symbol-Level Packet Pre-Emption for Low-Latency Industrial Wireless
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Solution Overview
Problem
Current wireless industrial communication systems lack mechanisms for pre-empting the transmission of lower-priority packets in favor of higher-priority packets, leading to significant latency degradation when higher-priority packets need to access the channel while lower-priority packets are still transmitting.
Innovation Solution
Implementing a method and system where a dedicated tag is inserted after the last symbol of a lower-priority packet stream to indicate pre-emption, allowing higher-priority packet streams to begin transmission immediately after the current symbol is completed, enabling efficient transmission and reception of symbols with different priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lower-priority packet is transmitted completely before a higher-priority packet, then the transmission channel is used efficiently, but the latency for higher-priority packets increases significantly
Solution Approach 1:
The patent segments the transmission process into symbol-level units, allowing the transmission of a lower-priority packet to be divided into multiple symbols. A dedicated tag is inserted after a certain number of symbols, indicating that the remaining symbols belong to a higher-priority packet. This segmentation enables fine-grained pre-emption at the symbol level rather than waiting for complete packet transmission.
Solution Approach 2:
The patent implements preliminary action by inserting a dedicated tag in advance within the lower-priority packet transmission stream. This tag预先 indicates that a higher-priority packet will follow, allowing the receiving end to prepare for the upcoming high-priority transmission and enabling the transmitter to switch to the higher-priority packet after the current symbol is sent.
2Reliability
If a higher-priority packet waits for the complete transmission of a lower-priority packet, then transmission conflicts are avoided, but real-time response requirements are not met
Solution Approach 1:
The patent introduces dynamic pre-emption capability that allows the transmission priority to change during the transmission process. The dedicated tag mechanism enables the system to dynamically switch from transmitting a lower-priority packet to a higher-priority packet at the symbol level, making the transmission system flexible and adaptive to changing priority requirements while maintaining transmission stability.
3Loss of time
If packet priority mechanisms are implemented using traditional methods, then some latency reduction is achieved, but symbol-level pre-emption capability is lacking
Solution Approach 1:
The patent introduces a dedicated tag as an intermediary element within the transmission stream. This tag serves as a marker that facilitates the pre-emption process by clearly indicating the boundary between lower-priority and higher-priority packet symbols. The intermediary tag simplifies the pre-emption control logic at both transmitting and receiving ends, making the symbol-level pre-emption mechanism manageable despite the added functionality.
Data Source
AI summary
A packet transmitter in a wireless communication system can perform a method for preparing transmission of physical layer protocol data units (PDUs). The method includes detecting a need to transmit a second stream of symbols having higher priority than a first stream of symbols currently being transmitted from the packet transmitter to a packet receiver. The first and second streams of symbols are each part of a respective physical layer PDU. A dedicated tag is inserted after a recent-most transmitted symbol of the first stream of symbols. The dedicated tag indicates that the first stream of symbols is subjected to pre-emption at the physical layer. Symbols of the second stream of symbols are inserted following the dedicated tag for transmission of the second stream of symbols to the packet receiver.