Group Acknowledgement Frame for WLAN Multi-User Uplink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently acknowledging simultaneous uplink transmissions from multiple client stations, particularly in supporting multi-user (MU) transmissions like OFDMA and MU-MIMO, which require effective acknowledgement mechanisms to manage data streams and ensure proper communication protocols across different standards.
Innovation Solution
A method is implemented where a communication device in a WLAN receives simultaneous uplink data units from multiple client stations and generates acknowledgement data units that include indications for multiple recipients, using techniques such as broadcast or multicast acknowledgement frames, to acknowledge receipt of data units, ensuring compatibility with both legacy and high-efficiency communication protocols like IEEE 802.11ax.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate acknowledgement frames are transmitted to each client station, then individual acknowledgement accuracy is improved, but network overhead and transmission time increase
Solution Approach 1:
The patent combines multiple individual acknowledgement frames into a single group acknowledgement frame that serves multiple client stations simultaneously. This merging approach reduces the total number of transmissions required, thereby decreasing network overhead and transmission time while still providing accurate acknowledgements for each received data unit from different clients.
Solution Approach 2:
The group acknowledgement frame is designed to perform multiple functions: it acknowledges data units from multiple different client stations within a single transmission. This multi-functional approach allows one frame to replace what would traditionally require multiple separate frames, improving efficiency without sacrificing acknowledgement accuracy.
2Productivity
If group acknowledgement frames are used for multiple client stations, then network efficiency is improved, but compatibility with legacy protocols deteriorates
Solution Approach 1:
The group acknowledgement frame is structured with distinct segments: a group acknowledgement portion that provides efficient multi-client acknowledgement, and individual client identification portions that maintain compatibility with legacy single-client protocols. This segmentation allows the frame to serve both modern multi-client efficiency requirements and legacy protocol compatibility.
Solution Approach 2:
The patent introduces an intermediary structure in the acknowledgement frame that bridges legacy and modern protocols. The frame includes fields that can be interpreted by both legacy single-client systems and modern multi-client systems, acting as a mediator that enables backward compatibility while supporting forward-looking efficiency improvements.
3Reliability
If acknowledgement information is included for all client stations, then communication reliability is improved, but frame size and processing complexity increase
Solution Approach 1:
The group acknowledgement frame implements partial action by including acknowledgement information only for the specific client stations that actually transmitted data units in the current uplink transmission. Rather than acknowledging all possible clients, the frame selectively includes only those relevant to the current transmission, reducing unnecessary processing complexity while maintaining reliability for actual communications.
Data Source
AI summary
In a method for simultaneously communicating with multiple communication devices in a wireless local area network a first communication device receives a plurality of uplink data units simultaneously transmitted by multiple second communication devices. The first communication device generates an acknowledgement data unit to acknowledge receipt of the multiple data units simultaneously transmitted by multiple second communication devices. The acknowledgement data unit includes (i) an indication that indicates that the acknowledgement data unit is intended for multiple second communication devices and (ii) respective acknowledgement information for the multiple second communication devices. The acknowledgement data unit is transmitted from the first communication device to the multiple second communication devices.