WLAN Data Recovery via Dynamic Channel State Determination
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Solution Overview
Problem
In wireless local area networks (WLANs), especially those supporting the IEEE 802.11ac standard, ensuring continuous high-throughput data transmission is challenging due to the difficulty in maintaining a contiguous 160 MHz channel bandwidth, leading to inefficiencies in data recovery procedures.
Innovation Solution
A method and apparatus for recovering data units in WLANs, where a station determines the channel state of secondary channel bands after a transmission failure and transmits a recovery PPDU through a recovery channel band formed by the primary and idle secondary channels, improving data transmission efficiency by re-determining available channel bands for recovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a contiguous 160 MHz channel bandwidth is used for high-throughput transmission, then data transmission rate is improved, but channel availability deteriorates due to legacy WLAN standard usage
Solution Approach 1:
The 160 MHz channel bandwidth is segmented into a primary 20 MHz channel and secondary channels. When a contiguous 160 MHz channel is unavailable due to legacy WLAN usage, the system can still utilize the primary channel and available secondary channels for transmission, dividing the bandwidth into manageable segments that can be independently assessed and used.
Solution Approach 2:
The system dynamically determines channel states of secondary channels after transmission failures and adaptively selects recovery channel bands based on current channel conditions. This dynamic adaptation allows the system to switch between different channel configurations (contiguous 160 MHz, non-contiguous channels, or narrower bandwidths) based on real-time availability, resolving the contradiction between maintaining high throughput and adapting to channel constraints.
2Adaptability or versatility
If non-contiguous channels are aggregated to form 160 MHz bandwidth, then channel availability is improved, but transmission efficiency deteriorates due to recovery procedure inefficiencies
Solution Approach 1:
The system performs preliminary determination of secondary channel states after transmission failures occur on the primary channel. By proactively assessing channel availability and identifying suitable recovery channels before attempting retransmission, the system avoids inefficient retry procedures and directly selects optimal recovery paths, thereby maintaining transmission efficiency even with non-contiguous channel aggregation.
Solution Approach 2:
The system implements a feedback mechanism where transmission failures on the primary channel trigger channel state determination for secondary channels. This feedback loop enables the system to learn from transmission outcomes and adaptively select recovery channel bands, improving transmission efficiency by avoiding repeated failures on unavailable channels and leveraging available non-contiguous channels effectively.
3Reliability
If channel state determination is performed after transmission failure, then data recovery reliability is improved, but transmission delay increases
Solution Approach 1:
The system changes the parameter being monitored from continuous channel assessment to failure-triggered channel state determination. By only determining secondary channel states when transmission failures occur rather than continuously monitoring, the system achieves reliable data recovery through targeted assessment while minimizing transmission delays associated with constant channel probing and evaluation.
Data Source
AI summary
Disclosed are a method and an apparatus for recovering data units in a wireless communication system. The method of recovering data units in a wireless LAN comprises the steps of: determining a channel state of at least one secondary channel band for a predetermined time after an STA has failed to transmit a first PPDU; and transmitting, at the STA, a second PPDU through a recovery channel band determined on the basis of the channel state, wherein the first PPDU is data transmitted through a primary channel and at least one secondary channel, and the recovery channel band may include, from among the primary channel band and at least one secondary channel, a secondary channel that is in an idle state.