HARQ Memory Management for WLAN Data Reliability
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in implementing reliable data transmission due to interference and lack of support for advanced retransmission protocols like Hybrid Automatic Repeat Request (HARQ), which affects data integrity and efficiency.
Innovation Solution
The implementation of a HARQ protocol in WLANs, including methods for determining memory availability at receiving devices, enabling or disabling the HARQ protocol based on feedback messages, and using HARQ frames with PHY layer headers for signaling, allows for dynamic switching between HARQ and ARQ protocols to improve retransmission operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ protocol is implemented in WLAN, then data reliability is improved, but device complexity increases due to memory management requirements
Solution Approach 1:
The patent implements dynamic HARQ process management where the receiving device activates HARQ processes based on available memory resources. The system dynamically adjusts the number of active HARQ processes according to current memory availability, enabling reliable HARQ operation when resources permit while gracefully degrading to simpler protocols when memory is constrained.
Solution Approach 2:
The patent changes the operational parameters of the HARQ protocol based on memory conditions. The receiving device signals its memory availability to the transmitting device, which then adjusts HARQ transmission parameters accordingly. This parameter adaptation allows the system to maintain data reliability when memory is sufficient while reducing complexity when memory is limited.
2Productivity
If memory is allocated for HARQ transmissions, then link throughput is improved, but available memory for other purposes is reduced
Solution Approach 1:
The patent implements dynamic memory allocation for HARQ operations where the receiving device monitors available memory and adjusts the number of active HARQ processes accordingly. This dynamic approach allows the system to maximize link throughput when memory is abundant while preserving memory for other critical functions when resources are constrained, achieving optimal throughput-memory tradeoff.
Solution Approach 2:
The receiving device provides feedback to the transmitting device about its memory availability status. This feedback mechanism enables the transmitting device to adjust HARQ transmission parameters and memory allocation dynamically, ensuring that memory is allocated for HARQ operations only when it does not compromise other essential functions, thus balancing throughput improvement with memory conservation.
3Productivity
If HARQ protocol is enabled, then retransmission efficiency is improved, but protocol complexity increases requiring dynamic switching capability
Solution Approach 1:
The patent implements dynamic protocol switching capability where the system can transition between HARQ and ARQ protocols based on operational conditions. The receiving device signals its HARQ capability and memory status, allowing the transmitting device to select the appropriate protocol dynamically. This enables the system to utilize efficient HARQ retransmissions when conditions permit while falling back to simpler ARQ when HARQ is not feasible, optimizing retransmission efficiency without permanently increasing protocol complexity.
Data Source
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for implementing a hybrid automatic repeat request (HARQ) protocol in a wireless local area network (WLAN). In some aspects, a first WLAN device may transmit a first HARQ frame to a second WLAN device. The first WLAN device may receive a first feedback message from the second WLAN device. The first feedback message may be a HARQ Block Acknowledgement (H-BA) message. The first WLAN device may determine to enable the HARQ protocol based on the first feedback message. The first WLAN device may receive an indication of an amount of memory available at the second WLAN device for processing HARQ transmissions. The first WLAN device may transmit a second HARQ frame to the second WLAN device based, at least in part, on the amount of memory available at the second WLAN device for processing HARQ transmissions.