Wi-Fi Resource Unit Notching for 6 GHz Incumbent Protection
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Solution Overview
Problem
Next-generation Wi-Fi systems operating in the 6-7 GHz band face interference issues with incumbent services, such as fixed point-to-point backhaul and microwave communication systems, due to overlapping bandwidth, which existing technologies fail to adequately address.
Innovation Solution
Implementing a method to notch the Wi-Fi signal, specifically using notching patterns and resource allocation signaling, to avoid overlapping frequencies with incumbent systems, thereby minimizing interference by determining and encoding a notching region within the channel based on the notching pattern indication received from the access point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Wi-Fi operates in the 6-7 GHz band with full bandwidth (160 MHz or 320 MHz), then available bandwidth and data rate are improved, but interference with incumbent services occurs
Solution Approach 1:
The Wi-Fi channel bandwidth is segmented into multiple resource units (RUs) of different sizes (26, 52, 106, 242, 484, or 996 subcarriers). The access point divides the available spectrum into RUs and allocates specific RUs to stations, avoiding frequency resources occupied by incumbent services. This segmentation allows Wi-Fi to utilize only the non-interfering portions of the 6-7 GHz band while maintaining efficient spectrum utilization.
Solution Approach 2:
Different resource units are assigned different frequency locations based on incumbent service locations. The system applies local quality by making each RU's frequency characteristics specific to its location in the spectrum, ensuring that RUs overlapping with incumbent services are either notched out or allocated differently. This allows the Wi-Fi system to adapt its transmission characteristics locally across different frequency regions.
2Object-affected harmful factors
If notching regions are implemented to avoid incumbent frequencies, then interference is reduced, but usable bandwidth for Wi-Fi transmission decreases
Solution Approach 1:
The notching pattern is dynamically configured based on the detected locations and bandwidths of incumbent services. The access point can adjust the size, position, and number of notched regions in real-time according to the incumbent service environment. This dynamic adaptation allows the system to minimize the impact of notching on usable bandwidth while maintaining protection against interference.
Solution Approach 2:
The system changes the parameter of resource unit allocation by introducing notching patterns that modify the frequency domain characteristics of transmitted signals. By adjusting parameters such as RU size, RU starting frequency, and notching depth, the system optimizes the balance between interference avoidance and bandwidth utilization. The notching pattern indication conveyed to stations allows them to adapt their transmission parameters accordingly.
3Object-affected harmful factors
If resource unit allocation with notching patterns is implemented, then coexistence with incumbent systems is achieved, but system complexity increases
Solution Approach 1:
The resource unit allocation mechanism serves multiple functions simultaneously: it enables coexistence with incumbent services through notching, maintains backward compatibility with existing Wi-Fi standards, and provides flexible spectrum utilization. The same RU allocation framework used for multi-user MIMO and OFDMA operations is extended to incorporate notching patterns, avoiding the need for separate complex control mechanisms.
Solution Approach 2:
The notching pattern indication acts as an intermediary information element conveyed from the access point to stations. This intermediary carries the necessary information about frequency resources to avoid, allowing stations to adjust their transmission without requiring complex real-time coordination or incumbent service detection capabilities at each station. The intermediary simplifies the system by centralizing the notching configuration management at the access point.
Data Source
AI summary
Methods, apparatus, and computer-readable media are described for notching a 6 GHz channel. A station associates with an access point on a 6 GHz band. A notching pattern indication is decoded from data received from the AP after associating with the AP. A notching region within a channel within the 6 GHz band is determined based on the notching pattern indication. The notching pattern indicates a width of a notching region and a location of the notching region within the channel. The notching region covers bandwidth occupied by an incumbent system within the channel. A physical layer convergence procedure (PLCP) protocol data unit (PPDU) is encoded for transmission on the channel to the AP. The PPDU is encoded to exclude transmission within the notching region.