Wireless LAN Frame Encoding for HARQ Retransmission Control
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Solution Overview
Problem
Wireless LAN systems face challenges in implementing effective retransmission control due to variable data lengths, which complicates the application of Hybrid Automatic Repeat-request (HARQ) techniques, leading to inefficient retransmission and incorrect data length recognition in frame aggregation.
Innovation Solution
A wireless LAN communication method and device that generate and transmit data frames with distinct encoding and retransmission units, allowing successful decoding determination, and include error-correcting codes and sequence information in physical layer headers and trailers to manage and combine error-free blocks from retransmitted MPDUs, even with incorrect data length information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ is applied to wireless LAN system, then retransmission control is improved, but variable data length makes sequence management difficult
Solution Approach 1:
The patent segments the data transmission into fixed-length blocks for HARQ encoding purposes, while maintaining the original variable-length MPDU structure for retransmission management. This segmentation allows HARQ to operate on standardized units without requiring complex sequence management for variable-length data, as each block is independently processed and tracked.
Solution Approach 2:
The patent introduces an intermediary mapping mechanism between HARQ block sequences and MPDU sequences. This intermediary layer translates between the fixed-block HARQ numbering system and the variable-length MPDU structure, enabling HARQ to function without directly managing complex variable-length sequence information.
2Ease of operation
If fragment processing is performed for access control, then data communication is enabled, but individual sequence management becomes necessary
Solution Approach 1:
The patent creates a universal sequence number structure that serves multiple functions simultaneously: it identifies individual fragments for access control purposes while also providing the sequence information needed for HARQ retransmission. This multi-functional sequence number eliminates the need for separate individual sequence management systems.
Solution Approach 2:
The patent merges the fragment sequence management function with the HARQ sequence management function into a unified sequence number system. By combining these previously separate management requirements into a single structured sequence number, the system achieves both access control fragment processing and simplified retransmission control without requiring individual separate management mechanisms.
3Device complexity
If data length information is used for frame aggregation, then frame structure is defined, but incorrect data length recognition occurs
Solution Approach 1:
The patent performs preliminary validation and correction of data length information before frame aggregation processing. By checking and potentially correcting the data length field in advance, the system prevents incorrect data length recognition from occurring during the aggregation process, ensuring accurate frame structure construction.
Solution Approach 2:
The patent implements feedback mechanisms where the receiver verifies data length information and provides correction information back to the transmitter if discrepancies are detected. This feedback loop ensures that incorrect data length recognition is identified and corrected, maintaining accurate frame structure definition throughout the communication process.
Data Source
AI summary
A wireless local area network (LAN) communication device includes a generator that generates a data frame for which a data unit in which an encoding process is performed and a data unit in which a retransmission process is performed are different from each other, and a transmission section that transmits the data frame. The encoding process makes it possible to determine whether or not decoding is successful.