WLAN PPDU Bandwidth Signaling for Flexible Segment Allocation
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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 method to reduce these overheads.
Innovation Solution
A bandwidth indication method is introduced where the transmission bandwidth of a PPDU is divided into segments, with a universal signal field carrying a bandwidth field that indicates 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
1Area of stationary object
If the transmission bandwidth of PPDU is increased to meet growing bandwidth requirements in 802.11be standard, then the bandwidth capacity is improved, but the signaling overheads increase exponentially
Solution Approach 1:
The patent divides the transmission bandwidth into multiple segments, where each segment is independently indicated using a fixed number of bits in the bandwidth indication field. This segmentation allows the system to represent large bandwidths (e.g., 320 MHz) by combining multiple smaller segments (e.g., four 80 MHz segments), thereby reducing the total number of bits required compared to indicating the entire bandwidth as a single unit.
Solution Approach 2:
The patent applies different indication strategies to different parts of the bandwidth structure. The bandwidth indication field uses a compact representation where each segment's bandwidth is indicated locally with fixed bits, rather than using a uniform detailed representation across the entire bandwidth. This local quality approach optimizes the signaling efficiency at each segment level.
2Manufacturing precision
If detailed resource unit allocation subfields are used to indicate resource allocation in each segment, then the resource allocation precision is improved, but the signaling overheads increase
Solution Approach 1:
The resource allocation information is segmented and organized hierarchically. The bandwidth indication field first indicates the bandwidth of each segment using compact bit representations. Then, resource unit allocation subfields are applied within each segment context. This segmentation allows precise resource allocation within segments while avoiding the need to transmit detailed allocation information for the entire bandwidth, thereby reducing overall signaling overheads.
Solution Approach 2:
The patent performs preliminary bandwidth indication in the bandwidth indication field before transmitting detailed resource unit allocation subfields. By first establishing the bandwidth context for each segment, the system enables subsequent resource allocation to be interpreted within that predefined context, reducing the amount of information needed in the allocation subfields themselves.
Data Source
AI summary
This application provides a bandwidth indication method applied in a wireless local area network supporting the 802.11be standard and a communication apparatus. The method includes: 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; and the access point sends the PPDU to the station. The method in this application can be used to reduce signaling overheads of PPDU transmission, and resources across segments can be allocated to the station, so that resources can be more flexibly allocated.