Aligned HARQ Frame Structure for Selective Retransmission
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in power consumption, throughput, computational complexity, and end-to-end delay due to the integration of forward error correction (FEC) and automatic repeat request (ARQ) protocols, particularly in handling noise, interference, and channel impairments, leading to misalignment issues in codewords and Medium Access Control (MAC) protocol data units (MPDUs) during retransmissions.
Innovation Solution
A method involving aligned splitting of data into parts at the MAC layer, followed by FEC encoding into codewords, ensures that retransmissions maintain aligned boundaries between MAC and physical layer units, facilitating efficient HARQ operations by avoiding misalignment and optimizing retransmission processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FEC and ARQ are integrated into layer processing structure, then error correction capability is improved, but processing complexity and resource consumption increase
Solution Approach 1:
The data unit is divided into multiple parts, each part being processed independently through segmentation into MPDUs and FEC units. This allows the complex FEC and ARQ processing to be distributed across multiple smaller units, reducing the processing complexity for each individual unit while maintaining overall error correction capability.
Solution Approach 2:
The patent introduces a hierarchical structure with multiple levels of segmentation (data unit → parts → MPDUs → FEC units → codewords). This dimensional breakdown allows the system to manage complexity by organizing processing tasks across different levels, where each level handles a specific portion of the overall error correction process.
2Reliability
If traditional HARQ retransmission is used, then data reliability is improved, but end-to-end delay and throughput performance deteriorate
Solution Approach 1:
By segmenting data into parts with aligned boundaries, the system enables selective retransmission of only failed parts rather than the entire data unit. This reduces the amount of data that needs to be retransmitted, thereby reducing end-to-end delay while maintaining reliability through targeted ARQ retransmissions.
Solution Approach 2:
The data is pre-segmented into parts with predetermined aligned boundaries before transmission. This preliminary organization ensures that when retransmission is needed, the boundaries are already aligned, eliminating the need for boundary realignment during retransmission and reducing additional processing time and delay.
3Productivity
If aligned splitting is implemented, then retransmission efficiency is improved, but buffer requirements and memory resources increase
Solution Approach 1:
The data is divided into multiple parts with aligned boundaries, allowing the receiver to buffer only the necessary portions during retransmission. This segmented approach reduces the total buffer space required compared to buffering the entire data unit, while still enabling efficient combining of codewords and MPDUs from multiple transmissions.
Data Source
AI summary
The present disclosure provides methods and apparatuses for receiving and transmitting data over a wireless interface. A data unit is transmitted and/or received split into a plurality of parts. The parts may be used as redundancy versions that are transmitted if retransmission is necessary. For example, each part is segmented into an integer number of MPDUs and the MPDUs are segmented into FEC units that become codewords after FEC encoding. If the transmission of the entire data unit is not successful, the redundancy versions corresponding to the parts are transmitted in a predefined order. Alternatively, those redundancy versions may be transmitted which were identified as erroneous (not successfully decodable).