A-PPDU Bandwidth Signaling for HE/EHT Backward Compatibility
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Solution Overview
Problem
The increased number of spatial streams in the next-generation wireless LAN system (EHT) requires improved signaling techniques to efficiently support PPDU transmission and reception between HE and EHT STAs.
Innovation Solution
Configuring an Aggregated-Physical Protocol Data Unit (A-PPDU) that simultaneously transmits an HE PPDU and an EHT PPDU, with each PPDU having a specific bandwidth indicator, allowing efficient transmission and reception by indicating the bandwidth of each sub-PPDU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of spatial streams is increased in the EHT system, then the throughput and capacity are improved, but the signaling complexity and difficulty of detection increase
Solution Approach 1:
The A-PPDU is segmented into multiple sub-PPDUs, each with its own bandwidth indicator field. This segmentation allows the signaling information to be distributed across different sub-PPDUs rather than concentrated in a single complex field, reducing the signaling complexity while supporting multiple spatial streams and frequency bands simultaneously.
Solution Approach 2:
The patent introduces a new dimension for signaling by adding bandwidth indicator fields at multiple levels (A-PPDU level and sub-PPDU level). This multi-level signaling structure enables efficient representation of bandwidth information for aggregated frequency bands without increasing the complexity of individual signaling fields.
2Reliability
If HE PPDU and EHT PPDU are transmitted separately, then backward compatibility is maintained, but the transmission efficiency and resource utilization decrease
Solution Approach 1:
The patent merges HE PPDU and EHT PPDU into a single A-PPDU structure that can carry both types of sub-PPDUs. This merging allows simultaneous transmission to HE STAs and EHT STAs in the same transmission opportunity, improving resource utilization and transmission efficiency while maintaining backward compatibility through the sub-PPDU structure.
Solution Approach 2:
The A-PPDU structure is designed with universal functionality to support both HE and EHT sub-PPDUs within the same aggregation. The flexible sub-PPDU configuration allows the system to adapt to different STA types and bandwidth requirements, achieving multi-functionality that serves both legacy and advanced systems efficiently.
3Loss of information
If the bandwidth indicator field is added to each PPDU, then the bandwidth information is accurately indicated, but the overhead and signal structure complexity increase
Solution Approach 1:
The bandwidth indicator field is added locally at relevant levels (A-PPDU level for total bandwidth and sub-PPDU level for individual sub-PPDU bandwidths). This local addition ensures that bandwidth information is provided exactly where needed without unnecessarily complicating the entire signal structure, as the field is only present when bandwidth aggregation is used.
Data Source
AI summary
Proposed are a method and apparatus for configuring an A-PPDU in a wireless LAN system. Specifically, a reception STA receives an A-PPDU from a transmission STA and decodes the A-PPDU. The A-PPDU includes a first PPDU for a primary 160 MHz channel and a second PPDU for a secondary 160 MHz channel. The first PPDU includes a first indicator including information about a bandwidth of the first PPDU. The second PPDU includes a second indicator including information about a bandwidth of the second PPDU. The first PPDU is a PPDU that supports an HE wireless LAN system, and the second PPDU is a PPDU that supports an EHT wireless LAN system.