HARQ PPDU Construction for Buffer Overflow Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Hybrid Automatic Repeat Request (HARQ) schemes in Wireless Local-Area Networks (WLANs) do not effectively manage buffering capabilities and retransmission processes, leading to inefficiencies in data transmission and reception.
Innovation Solution
The method involves constructing Hybrid Automatic Repeat Request (HARQ) Physical-layer Protocol Data Units (PPDUs) that adhere to the maximal buffering capability announced by the receiver, with segmentation and retransmission processes managed to ensure efficient data transmission and decoding, including the use of soft-decoding metrics for error correction and prioritization of retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ PPDUs are transmitted without considering receiver buffering capability, then transmission throughput may be higher, but buffer overflow occurs leading to data loss and reduced reliability
Solution Approach 1:
The transmitter receives an announcement of the receiver's maximal HARQ buffering capability before transmitting HARQ PPDUs. This preliminary knowledge allows the transmitter to construct PPDUs with appropriate sizes that will not overflow the receiver's buffer, ensuring reliable data transmission while maintaining efficient throughput.
Solution Approach 2:
The HARQ PPDU construction is dynamically adapted based on the receiver's announced buffering capability. The transmitter adjusts the PPDU size and segmentation strategy according to the specific receiver's buffer capacity, optimizing both reliability and throughput for each communication partner.
2Reliability
If HARQ PPDUs are segmented into many small coding units, then error correction capability improves, but transmission overhead increases and efficiency decreases
Solution Approach 1:
The transmitter adjusts the segmentation parameters of HARQ PPDUs based on the receiver's buffering capability. By optimizing the size and number of HARQ coding units within the available buffer space, the system achieves effective error correction without excessive segmentation overhead, balancing reliability and transmission efficiency.
3Productivity
If the transmitter sends large HARQ PPDUs to maximize throughput, then transmission speed increases, but the receiver may fail to buffer all data leading to packet loss
Solution Approach 1:
The receiver announces its maximal HARQ buffering capability to the transmitter before data transmission begins. This preliminary information allows the transmitter to construct HARQ PPDUs of appropriate sizes that will fit within the receiver's buffer capacity, ensuring both high throughput and complete data delivery without overflow losses.
Data Source
AI summary
A method for Wireless Local-Area Network (WLAN) communication in a WLAN device includes receiving from a remote WLAN device an announcement of a maximal Hybrid Automatic Repeat Request (HARQ) buffering capability of a receiver of the remote WLAN device. A HARQ Physical-layer Protocol Data Unit (HARQ PPDU), which includes one or more HARQ coding units, is constructed in the WLAN device in response to the announcement. The HARQ PPDU is transmitted from the WLAN device to the remote WLAN device. One or more of the HARQ coding units are retransmitted in response to a request from the remote WLAN device.