Wireless LAN Multi-Link Error Recovery for NSTR Latency
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Solution Overview
Problem
Existing wireless LAN technologies face challenges in ensuring low-latency communication and efficient error recovery for non-simultaneous transmit and receive (NSTR) devices due to interference and transmission latency issues in channel access operations.
Innovation Solution
A method for NSTR devices involving simultaneous frame transmissions on multiple links, with error recovery mechanisms that include retransmission and coordinated reception response frames to minimize interference and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a communication node performs channel access operation to transmit data using CSMA/CA scheme, then the node can compete with other nodes to transmit data, but time is consumed due to competition and data cannot be transmitted promptly
Solution Approach 1:
The patent applies preliminary action by performing channel access operations in advance for multiple frames. The transmitting device performs channel access before transmitting a first frame, and if successful, transmits additional frames without performing new channel access operations. This preliminary channel access enables subsequent frames to be transmitted immediately without waiting for new channel access procedures, thereby reducing transmission latency while maintaining the competitive channel access capability of CSMA/CA.
2Reliability
If a first STA retransmits a first frame after transmission failure, then error recovery is achieved, but the retransmission may cause interference in reception of a second reception response frame
Solution Approach 1:
The patent applies the intermediary principle by introducing a coordination mechanism where the transmitting device monitors the reception status of frames on different links. When a retransmission of a first frame might interfere with the reception of a second reception response frame, the system coordinates the timing and links to avoid this interference. This intermediary coordination enables error recovery through retransmission while preventing the harmful interference that would otherwise occur.
Solution Approach 2:
The patent applies feedback by using reception response frames that contain reception status information to guide retransmission decisions. The transmitting device receives feedback about whether frames were successfully received, and this feedback information is used to determine when and how to perform retransmissions. This feedback mechanism ensures reliable error recovery while the coordination based on this feedback prevents retransmissions from causing interference to other ongoing communications.
3Productivity
If simultaneous frame transmissions are performed on multiple links, then throughput is improved, but interference between links occurs for NSTR devices
Solution Approach 1:
The patent applies segmentation by dividing the transmission process into separate segments that can be coordinated across multiple links. Instead of allowing completely simultaneous transmissions that cause interference, the system segments the transmissions in time or by link priority, while still maintaining multi-link operation to achieve high throughput. This segmentation approach allows NSTR devices to benefit from multi-link transmissions without the harmful interference that would occur with truly simultaneous transmissions.
Data Source
AI summary
Disclosed are a method and apparatus for recovering errors in a wireless LAN. This method performed by a STA MLD comprises the steps of: transmitting, by a first STA linked with the STA MLD, a first frame to a first AP linked with an AP MLD on a first link; transmitting, by a second STA linked with the STA MLD, a second frame to a second AP linked with the AP MLD on a second link; if the transmission of the first frame fails, retransmitting, by the first STA, the first frame to the first AP on the first link; and receiving, from the first AP, a first reception response frame for the first frame on the first link.