Patent ID: 9621322
Date: 2017-04-11
CPC Classifications: H04L,H04W

Claim:
1. A method, comprising: determining, at a communication device, a physical layer (PHY) mode according to which a null data packet (NDP) is to be transmitted, the determined PHY mode from a set of PHY modes defined by a communication protocol, the set of PHY modes including i) a first PHY mode corresponding to a first channel bandwidth and ii) a second PHY mode corresponding at least a second channel bandwidth, wherein the second channel bandwidth is wider than the first channel bandwidth; when the communication device determines that the NDP is to be transmitted according to the first PHY mode, generating, at the communication device, the NDP according to a first PHY format, including generating a PHY preamble of the NDP according to a first preamble format; when the communication device determines that the NDP is to be transmitted according to the second PHY mode, generating, at the communication device, the NDP according to a second PHY format, including generating the PHY preamble of the NDP according to a second preamble format; and transmitting the NDP with the communication device.