HARQ Protocol Interlaced Communications for Receiver Processing
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Solution Overview
Problem
Current retransmission protocols in wireless local area networks (WLANs) are inefficient due to the inability to effectively manage receiver processing capabilities, leading to delays in feedback messages and suboptimal use of wireless channels.
Innovation Solution
Implementing a hybrid automatic repeat request (HARQ) protocol that includes transmitting an initial HARQ transmission, determining undecodable codewords, generating and transmitting a retransmission with punctured or incremental redundancy, and allowing for interlaced communications to optimize channel usage and processing time based on receiver capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional retransmission protocol is used in WLAN, then the system is simple to implement, but the throughput and channel utilization are suboptimal due to inability to manage receiver processing capabilities
Solution Approach 1:
The patent changes the parameter of feedback timing by introducing delayed acknowledgement mechanism. The receiver can delay sending feedback until it has sufficient processing time, transforming the fixed timing constraint into a flexible parameter that adapts to receiver capabilities, thereby improving throughput without excessive complexity
Solution Approach 2:
The patent introduces dynamic interlaced communications where the receiver can insert additional communications between the initial transmission and feedback. This dynamic approach allows the system to adapt to varying processing capabilities and channel conditions, optimizing throughput while maintaining manageable protocol complexity through structured flexibility
2Reliability
If the receiver processes HARQ transmissions quickly, then the feedback is sent promptly, but the receiver may not have sufficient time to decode complex codewords accurately
Solution Approach 1:
The patent applies preliminary action by having the receiver prepare processing resources in advance and use interlaced communications to create buffer time. The receiver can indicate its processing capability beforehand and use the interlaced communication structure to ensure sufficient time is allocated for accurate decoding before feedback is required
Solution Approach 2:
The patent introduces interlaced communications as an intermediary mechanism between the initial transmission and feedback. This intermediary structure provides additional processing time without directly delaying the feedback, allowing the receiver to decode complex codewords accurately while maintaining timely feedback through the structured intermediate communication phase
3Productivity
If the receiver sends feedback immediately after receiving HARQ transmission, then the channel is used efficiently, but the receiver processing capability is overwhelmed
Solution Approach 1:
The patent implements periodic action through structured interlaced communications that create regular processing intervals. The receiver can process HARQ transmissions at manageable periods rather than continuously, reducing processing load while maintaining channel utilization through the structured periodic feedback mechanism enabled by interlaced communications
Data Source
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for implementing a retransmission protocol in a wireless local area network (WLAN). The retransmission protocol may be based on a hybrid automatic repeat request (HARQ) protocol that supports a delayed acknowledgement for a HARQ retransmission based on receiver processing capability. A first WLAN device may determine that a second WLAN device requires more time to process the HARQ retransmission and may transmit a different communication (interlaced within the HARQ process) to either the second WLAN device or a third WLAN device during the time that the second WLAN device is processing the HARQ retransmission.