Multi-User Uplink Scheduling With Trigger Frames and Temporary AIDs
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Solution Overview
Problem
Existing wireless LAN systems face challenges in providing high-efficiency and high-performance communication in high-density environments, particularly in efficiently scheduling multi-user uplink transmissions.
Innovation Solution
A wireless communication terminal and method that utilizes a trigger frame to manage multi-user uplink data transmission, assigning temporary association identifiers (AIDs) and block ACKs to optimize resource allocation and scheduling, enabling efficient multi-user uplink transmission in contention-based channel access systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-user uplink transmission is implemented in high-density environments, then system throughput and resource utilization are improved, but scheduling complexity and difficulty of detecting and measuring increase
Solution Approach 1:
The patent segments the uplink transmission process by introducing trigger frames that divide the medium access into controlled phases. The AP sends trigger frames to coordinate uplink transmissions from multiple STAs, breaking down the complex multi-user scheduling into manageable sequential steps rather than attempting simultaneous coordination of all users.
Solution Approach 2:
The trigger frame acts as an intermediary mechanism between the AP and multiple STAs. It carries resource allocation information and coordinates the uplink transmissions, serving as a mediator that simplifies the scheduling complexity by providing a standardized control structure that all users must follow.
2Productivity
If temporary association identifiers are assigned for multi-user transmission, then resource allocation efficiency is improved, but device complexity and management overhead increase
Solution Approach 1:
The patent applies preliminary action by assigning temporary association identifiers (T-AIDs) to STAs before the actual uplink transmission occurs. The trigger frame contains T-AID assignments in advance, allowing STAs to prepare their transmissions with the correct resource allocations and identifiers already assigned, rather than determining them during the transmission process.
Solution Approach 2:
The patent changes the identifier parameter by introducing temporary association identifiers (T-AIDs) that are distinct from permanent AIDs. This parameter change allows the system to efficiently manage resource allocations for specific transmission instances while maintaining the ability to map back to permanent identifiers for ongoing session management.
3Reliability
If block ACK mechanism is used for multi-user uplink, then transmission reliability is improved, but communication time and protocol overhead increase
Solution Approach 1:
The patent merges multiple individual ACK transmissions into a single block ACK mechanism. Instead of the AP sending separate ACK frames to each STA that successfully transmitted data, the block ACK consolidates acknowledgments for multiple STAs into one frame, reducing the total communication time and overhead while maintaining reliability for all users.
Solution Approach 2:
The block ACK mechanism uses copying by including multiple STA identifiers and their corresponding ACK/NACK status in a single frame structure. This allows the AP to efficiently communicate transmission status to multiple STAs simultaneously by copying the essential acknowledgment information into a standardized block format rather than creating individual frames for each user.
Data Source
AI summary
The present invention relates to a wireless communication terminal and a wireless communication method for efficiently scheduling multi-user uplink transmission. To this end, provided are a wireless communication terminal, including: a transceiver; and a processor, wherein the processor is configured to: receive, by the transceiver, a trigger frame that triggers a multi-user uplink transmission, perform a multi-user uplink transmission in response to the received trigger frame, and receive, by the transceiver, an ACK for the multi-user uplink transmission, wherein when the multi-user uplink transmission is performed on a resource unit in which a temporary association identifier (AID) is assigned by the received trigger frame, the processor obtains ACK information for the terminal from the ACK for the multi-user uplink transmission based on the temporary AID and a wireless communication method using the same.