WLAN PPDU Bandwidth Signaling With Segment-Based U-SIG Fields
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Solution Overview
Problem
The increasing bandwidth requirements in wireless local area networks, particularly in the 802.11be standard, lead to exponentially higher signaling overheads in PPDU transmission, necessitating a solution to reduce these overheads.
Innovation Solution
A bandwidth indication method is introduced where the PPDU transmission bandwidth is divided into segments, with a universal signal field carrying a bandwidth field to indicate the channel bandwidth of allocated resource units, reducing the need for extensive resource unit allocation subfields and allowing flexible resource allocation across segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the transmission bandwidth is increased to meet growing bandwidth requirements, then the data transmission capacity is improved, but the signaling overheads increase exponentially
Solution Approach 1:
The patent divides the transmission bandwidth into multiple segments, where each segment can be independently indicated using a compact bandwidth field. This segmentation allows the system to represent large bandwidth allocations (e.g., 320 MHz) by combining indicators for smaller segments (e.g., four 80 MHz segments), thereby reducing the total number of bits required for signaling compared to indicating the entire bandwidth as a single unit.
Solution Approach 2:
The patent introduces a bandwidth field that uses a simplified encoding scheme to indicate channel bandwidth of resource units. By changing the parameter representation from detailed resource unit allocation subfields to a compact bandwidth field with segment-based indication, the signaling overhead is significantly reduced while maintaining the ability to convey necessary bandwidth information.
2Measurement precision
If detailed resource unit allocation subfields are used to indicate bandwidth, then the resource allocation precision is improved, but the signaling overhead increases
Solution Approach 1:
The patent segments the bandwidth indication into multiple parts, where each segment's bandwidth is indicated separately using compact fields. This allows precise resource allocation within each segment while avoiding the need to transmit detailed allocation subfields for the entire bandwidth, thus maintaining precision at the segment level while reducing overall signaling overhead.
Solution Approach 2:
The patent uses partial indication by transmitting bandwidth field information for segments rather than complete detailed allocation information for the entire bandwidth. This partial action approach provides sufficient precision for resource allocation decisions without the excessive overhead of full detailed subfield transmission.
Data Source
AI summary
This application provides bandwidth indication methods and communication apparatuses and can be applied, for example, in a wireless local area network supporting IEEE 802.11be standard. In an example method, an access point generates a physical layer protocol data unit (PPDU), where a transmission bandwidth of the PPDU is divided into a plurality of segments, the PPDU includes a universal signal (U-SIG) field carried on a segment, the U-SIG field includes a bandwidth field, and the bandwidth field indicates a channel bandwidth of a resource unit allocated to a station parked in the segment. The access point sends the PPDU to the station.