WLAN Retransmission Scheduling Using Same-Opportunity Resource Units
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Solution Overview
Problem
In wireless local area networks, transmission timeliness is insufficient due to retransmissions occurring at subsequent opportunities after detecting transmission errors, leading to inefficiencies in resource allocation and scheduling overheads.
Innovation Solution
A data transmission method where an access point sends service data, receives feedback information, and sends scheduling information to retransmit the data on a designated resource unit within the same transmission opportunity, optimizing resource allocation and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission is performed at the next transmission opportunity after detecting transmission errors, then transmission reliability is improved, but transmission timeliness deteriorates
Solution Approach 1:
The patent pre-allocates retransmission resource units (RUs) within the current transmission opportunity before transmission errors occur. When errors are detected via feedback information, the AP can immediately schedule retransmission on these pre-designated RUs without waiting for the next transmission opportunity, thus maintaining reliability while improving timeliness
Solution Approach 2:
The patent enables the AP to skip the conventional waiting period for the next transmission opportunity by utilizing pre-allocated retransmission RUs within the current opportunity. This allows rushed retransmission of erroneous data frames immediately after error detection, reducing the time loss while ensuring reliable delivery
2Reliability
If retransmission is performed at the next transmission opportunity, then transmission reliability is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent performs preliminary allocation of retransmission resource units within the current transmission opportunity. This advance preparation eliminates the need for complex resource negotiation and allocation procedures at the time of retransmission, thereby improving resource allocation efficiency while maintaining transmission reliability through dedicated retransmission RUs
3Reliability
If retransmission is performed at the next transmission opportunity, then transmission reliability is improved, but scheduling overheads increase
Solution Approach 1:
The patent pre-configures retransmission resource units and their associations with data frames before transmission occurs. When errors are detected, the AP can directly schedule retransmission using pre-established mappings without performing complex scheduling calculations, thereby reducing scheduling overheads while ensuring reliable retransmission
Data Source
AI summary
A data transmission method and a communication apparatus to improve transmission timeliness. In a wireless local area network, one channel transmission opportunity is obtained by an access point AP through contention. The AP sends service data to a station STA, and the STA feeds back a first data frame in which an error occurs in the service data to the AP. The AP sends scheduling information on a downlink channel to notify the STA of a retransmission resource unit used for retransmission of the first data frame, and retransmits the first data frame on the retransmission resource unit. Correspondingly, the STA receives the first data frame on the retransmission resource unit.