Simultaneous Transmit Receive Relay Latency Reduction
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Solution Overview
Problem
Relayed transmissions in wireless networks experience higher latency due to the need for transmissions to go through a relay station, and this latency increases when transmission or reception errors occur at the relay station, leading to inefficiencies in the retransmission process.
Innovation Solution
The use of Simultaneous Transmit and Receive (STR) Multi-Link Devices (MLDs) that can simultaneously transmit and receive data in different channels, allowing the relay station to reduce relay transmission latency by receiving and relaying data concurrently, and by quickly detecting errors and retransmitting data without waiting for an ACK timeout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay station receives and relays data sequentially through traditional protocols, then transmission reliability is maintained through ACK timeout waiting, but relay transmission latency increases significantly
Solution Approach 1:
The relay station performs preliminary actions by receiving the data packet and preparing for potential retransmission before the ACK timeout occurs. The source station proactively retransmits the packet upon detecting early termination of relay transmission, eliminating the need to wait for ACK timeout while maintaining reliability through redundant transmission.
Solution Approach 2:
The invention skips the traditional ACK timeout waiting period by implementing early retransmission. When the relay station terminates transmission early due to error detection, the source station rushes to retransmit the packet immediately without waiting for the standard ACK timeout, thereby reducing latency while preserving reliability.
2Reliability
If relay station waits for ACK timeout before retransmitting data, then transmission reliability is ensured, but retransmission efficiency deteriorates
Solution Approach 1:
The system implements feedback mechanisms where the source station monitors relay transmission status and detects early termination. This feedback triggers immediate retransmission without waiting for ACK timeout, improving retransmission efficiency while maintaining reliability through active monitoring and responsive action.
Solution Approach 2:
The source station takes preliminary action by detecting relay transmission termination and initiating retransmission before the ACK timeout occurs. This proactive approach improves retransmission efficiency by eliminating unnecessary waiting time while ensuring reliability through preemptive retransmission.
3Loss of time
If relay station uses simultaneous transmit and receive capabilities in different channels, then relay transmission latency is reduced, but device complexity increases
Solution Approach 1:
The relay station utilizes another dimension by operating in multiple frequency channels simultaneously. By receiving data in one channel and relaying in a different channel, the system reduces latency through parallel operations while managing complexity through spatial-frequency separation of transmit and receive functions.
Data Source
AI summary
An embodiment is method performed by a relay station (STA) that acts as a relay between a source STA and a destination STA. The method includes wirelessly receiving a physical layer protocol data unit (PPDU) from the source STA in a first channel, while receiving the PPDU from the source STA in the first channel, relaying the PPDU to the destination STA in a second channel that is different from the first channel, and responsive to detecting an error in receiving the PPDU from the source STA, ending the relaying of the PPDU to the destination STA early.