Trigger Frame Channel Availability for MU Interference
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Solution Overview
Problem
Current multi-user (MU) transmission systems face challenges in efficiently managing channel availability and interference, particularly due to overlapping basic service sets (OBSS), leading to issues like hidden node problems and inefficient resource allocation, which affect the reliability and throughput of downlink and uplink MU transmissions.
Innovation Solution
The system employs a processor and transmitter to detect trigger frames and channel availability information, allowing for the generation and transmission of frames that optimize channel usage and schedule MU transmissions to avoid interference, using techniques such as split CTS and user-specific sequences to improve resource allocation and interference avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-user transmission is implemented to improve system throughput, then productivity increases, but interference from overlapping basic service sets increases causing hidden node problems
Solution Approach 1:
The patent introduces trigger frames as intermediary signals that coordinate uplink multi-user transmissions. These trigger frames are sent by the access point to schedule specific users to transmit on specific resource units, acting as a mediator that resolves the hidden node problem by providing centralized coordination rather than allowing uncoordinated transmissions that cause interference
Solution Approach 2:
The system performs preliminary channel availability detection and resource allocation before actual data transmission. The access point detects channel conditions and prepares trigger frames in advance, scheduling resource units and assigning users to specific channels before the actual uplink transmission occurs, thereby preventing interference rather than reacting to it
2Reliability
If channel availability detection is performed for multiple channels to improve transmission reliability, then reliability increases, but the complexity of channel management increases
Solution Approach 1:
The patent segments the wireless channel into multiple independent resource units, each assignable to different users. Instead of managing one large complex channel, the system divides it into smaller manageable resource units (e.g., 26-subcarrier RUs, 52-subcarrier RUs, 106-subcarrier RUs) that can be independently allocated and detected, reducing the complexity of channel management while maintaining reliability through diversification
Solution Approach 2:
The system changes the parameter of channel representation from a single unified channel view to multiple discrete resource unit parameters. Each resource unit has its own availability status, user assignment, and transmission parameters, allowing the system to manage channel complexity by transforming it into a set of manageable discrete parameters rather than a monolithic complex channel
Data Source
AI summary
Methods and apparatus for protection of multi-user (MU) transmission are described herein. An apparatus includes a receiver, a transmitter and a processor. The receiver and the processor detect a trigger frame for an uplink (UL) multi-user (MU) transmission. The processor and the transmitter generate and send a frame in response to the trigger frame and transmit channel availability information for a plurality of channels in response to the trigger frame. The receiver and the processor detect data in a resource unit (RU) of a downlink (DL) MU physical layer (PHY) protocol data unit (PPDU) on one of the plurality of channels. The one of the plurality of channels is based on the transmitted channel availability information.