Wi-Fi PPDU Bandwidth Extension Field for 480 and 640 MHz
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Solution Overview
Problem
Current Wi-Fi technologies face limitations in efficiently transmitting data at higher channel bandwidths such as 480 MHz and 640 MHz, as existing standards struggle to indicate and support these bandwidths effectively, leading to suboptimal throughput and compatibility issues.
Innovation Solution
Incorporating a bandwidth extension field in the universal signal field (U-SIG) of the PPDU to jointly indicate a 480 MHz or 640 MHz contiguous channel bandwidth, allowing for the transmission of larger channel bandwidths by defining specific channelizations and puncturing patterns, and adjusting parameters like tone plans and resource unit allocations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing Wi-Fi standards are used, then backward compatibility is maintained, but channel bandwidth indication capability is insufficient for 480 MHz and 640 MHz transmissions
Solution Approach 1:
The patent applies nesting by placing the bandwidth extension field inside the existing U-SIG field structure. The U-SIG field contains both the original bandwidth field and the additional bandwidth extension field, allowing 480 MHz and 640 MHz channel bandwidths to be indicated by combining the values from both fields. This nested structure enables new bandwidth capabilities while maintaining compatibility with existing protocol structures.
Solution Approach 2:
The patent extends the bandwidth indication capability by adding another dimension to the existing bandwidth field. Instead of using only the original bandwidth field, the system now uses a combination of the bandwidth field and the bandwidth extension field, effectively doubling the indication capability to support 480 MHz and 640 MHz channel bandwidths.
2Productivity
If larger channel bandwidths (480 MHz and 640 MHz) are used, then peak throughput is increased, but compatibility with legacy devices is reduced
Solution Approach 1:
The patent implements dynamic bandwidth indication where the system can adaptively select between different bandwidth modes (20 MHz, 40 MHz, 80 MHz, 160 MHz, 320 MHz, 480 MHz, and 640 MHz) based on the capabilities of communicating devices. The bandwidth extension field allows dynamic negotiation of channel bandwidth, enabling the system to use larger bandwidths when both devices support them and fall back to smaller bandwidths when legacy devices are involved.
Solution Approach 2:
The U-SIG field with the bandwidth extension field serves multiple functions: it maintains compatibility with legacy devices that understand only the original bandwidth field while simultaneously enabling support for 480 MHz and 640 MHz channel bandwidths. This universal structure allows the same field to serve both legacy and advanced devices.
3Adaptability or versatility
If bandwidth extension field is added to U-SIG, then 480 MHz and 640 MHz channel bandwidths can be indicated, but protocol complexity increases
Solution Approach 1:
The patent merges the bandwidth indication function into the existing U-SIG field structure by adding the bandwidth extension field as part of the U-SIG. This combining approach allows the system to indicate 480 MHz and 640 MHz channel bandwidths using a unified field structure rather than requiring separate indication mechanisms, thereby limiting the increase in protocol complexity.
Data Source
AI summary
This disclosure provides methods, components, devices and systems for 480 and 640 megahertz (MHz) transmission in Wi-Fi. Some aspects more specifically relate to inclusion of a bandwidth field and a bandwidth extension field in a preamble of a physical layer protocol data unit (PPDU) that jointly indicate that the channel bandwidth of the PPDU is a contiguous 480 MHz channel bandwidth or a 640 MHz channel bandwidth. In some aspects, parameters of the PPDU may be defined based on the PPDU occupying a 480 MHz or 640 MHz bandwidth. For example, the parameters may include tone plans, allowed puncturing patterns, signaling of the puncturing plans, signaling of the resource unit allocation, a short training field, a long training field, pilot signal sequences, phase shifts, a segment parser, and/or a spectral mask.