NDPA for multi-AP coordinated beamforming (CBF) and multi-AP joint transmission (JT) in EHT

US11716121B2 · kind B2 · utility

Assignee

• Intel Corporation · US

Inventors

• Feng Jiang · Santa Clara, US
• Qinghua Li · Sunnyvale, US
• Xiaogang Chen · Beijing, CN
• Po-Kai Huang · San Jose, US
• Danny Alexander · Ganay Yehuda, IL
• Chen Kojokaro · Yoqneam Illit, IL
• Assaf Gurevitz · Ramat HaSharon, IL
• Ziv Avital · Haifa, IL

Key dates

• Filing date: Oct 23, 2020
• Grant date: Aug 1, 2023
• Expiry date: Apr 9, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W84/12
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An access point (AP) configured for multi-AP coordinated beamforming (CBF) and multi-AP joint transmission (JT) in an Extremely High Throughput (EHT) wireless local area network (WLAN), when operating as a master AP (AP1) in a multi-AP network, is configured to encode a null data packet announcement (NDPA) frame for multi-AP channel sounding. The NDPA is configured for transmission to a second AP (AP2) and a plurality of stations (STAs) of an EHT group. The NDPA may be encoded to have an information field indicating whether a sounding sequence type is for JT channel sounding or CBF channel sounding. The NDPA may further be encoded to include fields identifying the APs participating in the channel sounding. In these embodiments, the channel sounding sequence for JT can be reused for the channel sounding on CBF.