Primary Node Uplink Multiuser Scheduling via Control Frames
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Solution Overview
Problem
Current WLAN networks face inefficiencies in parallel multiuser data transmission, particularly in scheduling multiple users and handling error recovery during uplink transmissions, which hinders resource utilization and network performance.
Innovation Solution
A method where a primary node acquires a transmission opportunity and uses control/management frames to instruct secondary nodes for uplink multiuser data transmission, acknowledging received data, and scheduling users for retransmissions within a preset time threshold, ensuring efficient parallel multiuser data transmission by utilizing a frame structure with acknowledgement/paging information fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel multiuser data transmission is implemented in WLAN networks, then network efficiency and resource utilization are improved, but scheduling complexity and error recovery mechanisms become more complex
Solution Approach 1:
The patent segments the uplink multiuser data transmission process into distinct phases: initial scheduling phase where the AP allocates resources to multiple STAs, data transmission phase where STAs send data simultaneously, and acknowledgment phase where the AP provides feedback. This segmentation simplifies the overall scheduling complexity by breaking down the complex parallel transmission into manageable sequential steps while maintaining high network efficiency.
Solution Approach 2:
The patent implements preliminary scheduling actions where the AP pre-allocates time-frequency resources and transmission parameters to multiple STAs before the actual data transmission begins. This preliminary action includes setting up resource units (RUs), assigning modulation and coding schemes, and preparing acknowledgment mechanisms in advance, thereby reducing real-time scheduling complexity during the actual parallel transmission while maintaining high network efficiency.
2Productivity
If multiple secondary nodes transmit data simultaneously to a primary node, then uplink network capacity increases, but error recovery and retransmission management become more difficult
Solution Approach 1:
The patent implements a comprehensive feedback mechanism where the primary node (AP) sends acknowledgment frames to secondary nodes (STAs) indicating successful reception or errors in their transmitted data. The feedback includes specific error information and retransmission instructions for each STA, enabling reliable error recovery while maintaining high uplink network capacity through parallel transmission. This targeted feedback approach manages the complexity of error recovery for multiple simultaneous transmissions efficiently.
Solution Approach 2:
The patent employs a selective retransmission strategy where only data units that experience errors are identified and scheduled for retransmission, while successfully received data units are discarded from the transmission queue. This approach allows the system to maintain high uplink capacity by continuing parallel transmissions for error-free data while recovering from errors only where necessary, rather than retransmitting all data conservatively.
3Productivity
If the primary node schedules multiple users for uplink transmission, then resource utilization improves, but the overhead for managing multi-frame transmission increases
Solution Approach 1:
The patent merges multiple individual scheduling operations into a single multi-user uplink transmission framework. Instead of managing separate schedules for each STA, the system combines resource allocation, modulation schemes, and acknowledgment mechanisms into unified control structures that serve multiple STAs simultaneously. This merging reduces control overhead by eliminating redundant management information while maintaining high resource utilization through coordinated multi-user transmission.
Solution Approach 2:
The patent designs universal control frames and resource allocation structures that can serve multiple different STAs with different data requirements. The same acknowledgment frame format, resource unit structure, and scheduling mechanism work universally for all uplink STAs, reducing the need for STA-specific control information and thereby minimizing control overhead while maximizing resource utilization across diverse user scenarios.
Data Source
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AI summary
Disclosed are a method for implementing parallel multiuser data transmission and a primary node. The method includes: a primary node acquires a transmission opportunity or a service period; and the primary node utilizes a control/management frame carrying uplink multiuser control information to instruct a secondary node to perform uplink multiuser data transmission in the transmission opportunity or the service period. The control/management frame in the embodiments of the present invention has a null acknowledgment/paging information field, which provides an implementation solution of instructing uplink multiuser to transmit uplink data at the beginning of a transmission period, first scheduling a certain user or some users to perform the uplink multiuser data transmission during the multi-frame transmission, or instructing a user to perform uplink retransmission.