Multi-STA BlockAck Frame Aggregation in OFDMA Wireless LAN
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Solution Overview
Problem
Current wireless LAN systems face inefficiencies in signaling for transmitting Multi-STA BlockAck frames based on 11ax PPDU, leading to increased overhead and reduced transmission efficiency.
Innovation Solution
A method and apparatus for efficiently transmitting and receiving Multi-STA BlockAck frames in a wireless LAN system supporting OFDMA, involving the transmission of an uplink multi-user frame based on a trigger frame, and acquiring data streams including ACK/NACK from an OFDMA PPDU, where the data stream is identified by a user field indicated by a predetermined ID, allowing identical allocation to other STAs that have performed UL MU transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional signaling methods are used for transmitting Multi-STA BlockAck frames, then compatibility with existing standards is maintained, but signaling overhead increases and transmission efficiency decreases
Solution Approach 1:
The patent combines multiple BlockAck frames intended for different STAs into a single aggregated Multi-STA BlockAck frame. This merging approach reduces the total number of separate signaling transmissions required, thereby decreasing signaling overhead while improving overall transmission efficiency in wireless LAN systems
Solution Approach 2:
The patent creates a universal Multi-STA BlockAck frame structure that can simultaneously serve multiple STAs with different data stream requirements. This single frame type replaces the need for multiple separate BlockAck frames, achieving multi-functionality that reduces overhead while maintaining compatibility with existing OFDMA and trigger frame mechanisms
2Loss of information
If separate BlockAck frames are transmitted to each STA, then individual acknowledgment accuracy is maintained, but signaling overhead increases
Solution Approach 1:
The patent merges individual BlockAck information for multiple STAs into a single aggregated frame structure. Each STA's ACK/NACK status is included within the same Multi-STA BlockAck frame, maintaining complete acknowledgment information while reducing the total quantity of signaling data transmitted across the wireless medium
3Ease of operation
If individual BlockAck frames are used for each STA, then processing simplicity is maintained, but channel utilization decreases
Solution Approach 1:
The patent combines multiple BlockAck transmissions into a single aggregated frame, which improves channel utilization by reducing the total time and resources spent on signaling. The receiving STAs process the aggregated frame by extracting their specific acknowledgment information, maintaining relative processing simplicity while achieving better channel efficiency
Solution Approach 2:
The patent uses trigger frames to preliminarily organize and allocate resources for the aggregated BlockAck transmission. This preliminary action allows the access point to efficiently structure the Multi-STA BlockAck frame before transmission, simplifying the overall process while maximizing channel utilization
Data Source
AI summary
A method by which a station (STA) receives a Multi-STA BlockAck (M-BA) frame in a wireless LAN system supporting an OFDMA, according to one embodiment of the present invention, comprises the steps of: transmitting an uplink multi-user (ULMU) frame on the basis of a trigger frame; receiving an M-BA frame based on an OFDMA physical layer protocol data unit (PPDU) including an SIG B field; and acquiring a data stream including an ACK/NACK for the STA from the OFDMA PPDU-based M-BA frame, wherein the STA acquires the data stream according to an indication of a user field identified by a predetermined ID among a plurality of user fields included in the SIG B field, and the data stream indicated by the user field identified by the predetermined ID can be equally allocated to other STAs performing the UL MU transmission on the basis of the trigger frame.