A-PPDU Signaling for HE/EHT Decoding Without SST Support
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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 decode HE and EHT PPDUs, particularly when Simultaneous Spatial Streams (SST) are not supported.
Innovation Solution
A method for configuring an Aggregated-Physical Protocol Data Unit (A-PPDU) that simultaneously transmits HE and EHT PPDUs on separate 80 MHz channels, with identical L-SIG, RL-SIG, HE-SIG-A, and HE-SIG-B fields to facilitate decoding by EHT stations, and an indicator to distinguish between the two.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HE PPDU and EHT PPDU are transmitted simultaneously on separate 80 MHz channels without SST support, then the throughput and spectral efficiency are improved, but the decoding complexity and signaling overhead increase for EHT stations
Solution Approach 1:
The patent divides the 160 MHz bandwidth into two separate 80 MHz channels, with HE PPDU transmitted on one channel and EHT PPDU on the other. This segmentation allows EHT stations to decode HE-SIG-B on the HE channel without needing to perform complex channel switching, thereby reducing decoding complexity while maintaining high throughput through parallel transmission.
2Adaptability or versatility
If channel switching is implemented to decode EHT PPDU, then the adaptability to different PPDU types is improved, but the time delay and decoding efficiency deteriorate
Solution Approach 1:
The patent performs preliminary action by transmitting HE-SIG-B on the HE PPDU channel before the EHT PPDU transmission. EHT stations can decode HE-SIG-B in advance to obtain resource allocation information, eliminating the need for time-consuming channel switching during the data transmission phase. This preliminary decoding action reduces time delay while maintaining adaptability to different PPDU types.
3Ease of operation
If identical L-SIG, RL-SIG, HE-SIG-A, and HE-SIG-B fields are used in both HE and EHT PPDUs, then the ease of decoding for EHT stations is improved, but the loss of information about EHT-specific parameters increases
Solution Approach 1:
The patent uses HE-SIG-B as an intermediary to carry both HE and EHT resource allocation information. By encoding EHT-specific parameters within the HE-SIG-B structure using a unified resource allocation table, the patent enables EHT stations to decode the signal easily while still obtaining EHT-specific parameters, thus resolving the contradiction between ease of decoding and information completeness.
Data Source
AI summary
Proposed are a method and an apparatus for receiving 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 80 MHz channel, and a second PPDU for a secondary 80 MHz channel. The first PPDU includes a first L-SIG, a first RL-SIG, an HE-SIG-A, an HE-SIG-B, and first data. The second PPDU includes a first L-SIG, a first RL-SIG, an HE-SIG-A, an HE-SIG-B, a second L-SIG, a second RL-SIG, a U-SIG, an EHT-SIG, and second data. The HE-SIG-A includes an indicator of the A-PPDU.