Multi-STA Block Acknowledgement Signaling for WLAN IDC Unavailability
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face challenges in managing in-device coexistence (IDC) issues, which can lead to performance degradation, particularly in next-generation Wi-Fi standards like IEEE 802.11be, due to the lack of effective signaling mechanisms for informing stations (STAs) about unavailability during IDC durations.
Innovation Solution
The proposed solution involves signaling IDC information via multi-station block acknowledgement (BA) frames, where unavailability information is included in the per association identifier (AID) traffic identifier (TID) subfield, allowing STAs to adjust their operations during IDC periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing WLAN signaling mechanisms are used, then the system maintains simple communication protocols, but in-device coexistence information cannot be effectively signaled, leading to performance degradation
Solution Approach 1:
The patent combines IDC information signaling with the existing multi-STA BA frame structure by utilizing unused or reserved fields within the frame. Specifically, it merges the unavailability information (indicating IDC duration and affected STAs) with the acknowledgment functionality, allowing both purposes to be achieved in a single frame transmission without requiring separate signaling messages.
Solution Approach 2:
The multi-STA BA frame is enhanced to serve dual functions: its traditional role in acknowledging received frames and a new role in signaling IDC information. By making the frame multi-functional, the patent eliminates the need for separate IDC signaling mechanisms while maintaining protocol simplicity and reducing overhead.
2Ease of operation
If unavailability information is not signaled to STAs, then the signaling protocol remains simple, but STAs continue transmitting frames during IDC durations, causing performance degradation
Solution Approach 1:
The patent implements a feedback mechanism where the AP sends unavailability information to STAs through the multi-STA BA frame. This feedback informs STAs about upcoming IDC periods, allowing them to adjust their transmission behavior accordingly. The feedback loop ensures STAs have the necessary information to avoid transmitting during periods when the AP is unavailable, preventing performance degradation.
Solution Approach 2:
The unavailability information is signaled in advance before the actual IDC period begins. By providing提前 notification to STAs about when the AP will be unavailable, the system allows STAs to take preliminary action by suspending transmissions before the IDC period starts, thereby avoiding wasted transmissions and potential performance issues.
3Loss of information
If separate signaling frames are used for IDC information, then complete information can be transmitted, but frame overhead increases and communication efficiency decreases
Solution Approach 1:
The patent merges IDC information signaling with the existing multi-STA BA frame, combining two communication functions into a single frame. This approach transmits complete IDC information (unavailability duration, affected STA identifiers) without requiring separate signaling frames, thereby maintaining information completeness while improving communication efficiency by reducing overhead.
Data Source
AI summary
The present disclosure is related to signaling of in-device coexistence (IDC) information via multi-station (STA) block acknowledgement (BA) frame in a wireless local area network (WLAN) system. According to an embodiment of the present disclosure, a method performed by a STA configured to operate in a WLAN system comprises: receiving a frame; and transmitting a multi-STA block acknowledgement (BA) frame comprising unavailability information related to the STA in response to the frame, wherein BA information field of the multi-STA BA frame comprises per association identifier (AID) traffic identifier (TID) information subfield related to the STA, and wherein the unavailability information is included in the per AID TID information subfield based on an AID TID information subfield of the per AID TID information subfield being set to a specific value.