HEW Frame Exchange Trigger Mechanism for Uplink Coordination
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Solution Overview
Problem
Current Wireless Local Area Networks (WLANs) face limitations in providing noticeable performance improvements to users, especially with increased demand for high-capacity and high-rate services, despite advancements like IEEE 802.11n and 802.11ac standards, due to the lack of methods for efficient frame exchange in uplink single user and multiple user transmissions in High Efficiency WLAN (HEW) systems.
Innovation Solution
A method and apparatus for frame exchange in HEW that involves transmitting and receiving frames between access points (APs) and stations (STAs) using Physical layer Protocol Data Units (PPDUs), where the type of PPDU (Single User or Multiple User) is indicated, enabling efficient uplink single user and multiple user transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional WLAN systems increase bandwidth and peak transmission rate, then transmission speed is improved, but user-perceived performance does not show drastic increase
Solution Approach 1:
The patent segments the uplink transmission by introducing separate trigger frame mechanisms for Single User (SU) and Multiple User (MU) scenarios. The AP sends specific trigger frames (e.g., Trigger Frame for SU, Trigger Frame for MU) that elicit appropriate PPDU types from STAs, enabling optimized handling for different transmission scenarios and improving overall system efficiency and user-perceived performance
Solution Approach 2:
The patent implements dynamic PPDU type selection based on transmission scenarios. The AP dynamically determines whether to send SU or MU trigger frames based on current network conditions, STA capabilities, and service requirements. This dynamic adaptation allows the system to optimize performance for each specific scenario rather than using a fixed transmission mode
2Quantity of substance
If HEW systems support simultaneous access of numerous stations, then network capacity is improved, but frame exchange methodology is undefined
Solution Approach 1:
The patent introduces trigger frames as intermediary control messages between the AP and STAs. These trigger frames serve as mediators that coordinate uplink transmissions, specifying parameters such as resource allocation, modulation schemes, and timing. This intermediary mechanism simplifies the complex frame exchange process by providing structured control signals that manage simultaneous multi-user access
Solution Approach 2:
The patent creates a universal trigger frame structure that can serve multiple functions: it can trigger SU transmissions, MU transmissions, indicate resource allocation, specify modulation and coding schemes, and coordinate timing. This multi-functional design reduces the need for separate specialized frames for each function, simplifying the overall frame exchange mechanism while supporting numerous simultaneous users
Data Source
AI summary
A frame exchange in a High Efficiency WLAN (HEW) includes a method for exchanging frames implemented by an access point in a wireless local area network. The method further includes transmitting to one or more stations (STAs) a first frame eliciting a second frame from the one or more STAs in a downlink (DL) Physical layer Protocol Data Unit (PPDU), wherein the DL PPDU carrying the first frame includes information indicating a type of a PPDU carrying the second frame from PPDU types including a Single User (SU) PPDU and a Multiple User (MU) PPDU; and receiving from the one or more STAs the second frame in an uplink (UL) PPDU having a type determined based on the information indicating the type of the PPDU.