Enhanced trigger-based null data packet for channel sounding

Abstract

This disclosure describes systems, methods, and devices related to a trigger-based null data packet (NDP) for channel sounding system. A device may send a trigger frame to a group of station devices, the group of station devices including a first station device, the trigger frame indicating a high efficiency (HE) long training field (HE-LTF) mode and a guard interval duration. The device may identify a HE trigger-based (TB) null data packet (NDP) received from the first station device, the HE TB NDP including a first packet extension field, wherein the HE TB NDP is associated with the HE-LTF mode and the guard interval duration indicated in the trigger frame. The device may send a downlink NDP including a second packet extension field, a second HE-LTF mode, and a second guard interval duration. The device may determine channel state information based on HE TB NDP received from the first station device.

What is claimed is: 
     
         1 . A device comprising storage coupled to processing circuitry, the processing circuitry configured to:
 cause to send a trigger frame to a group of station devices, the group of station devices comprising a first station device, wherein the trigger frame comprises a first indication of a high efficiency (HE) long training field (HE-LTF) mode and a second indication of a guard interval duration;   identify a HE trigger-based (TB) null data packet (NDP) received from the first station device, wherein the HE TB NDP comprises a first packet extension field, wherein the HE TB NDP is associated with the HE-LTF mode and the guard interval duration;   determine channel information based on the HE TB NDP; and   cause to send a downlink NDP, wherein the downlink NDP comprises a second packet extension field and is associated with the HE-LTF mode and the guard interval duration.   
     
     
         2 . The device of  claim 1 , wherein the HE-LTF mode is a 2× HE-LTF mode. 
     
     
         3 . The device of  claim 2 , wherein the guard interval duration is 0.8 microseconds. 
     
     
         4 . The device of  claim 2 , wherein the guard interval duration is 1.6 microseconds. 
     
     
         5 . The device of  claim 1 , wherein the first packet extension field is greater than zero. 
     
     
         6 . The device of  claim 1 , wherein the first packet extension field is 4 microseconds, wherein the HE TB NDP further comprises a first HE short training field (HE-STF), wherein the first HE-STF has a duration of 8 microseconds, wherein the downlink NDP comprises a second HE-STF, and wherein the second HE-STF has a duration of 4 microseconds. 
     
     
         7 . The device of  claim 1 , wherein the HE TB NDP comprises a set of fields, wherein the downlink NDP comprises the set of fields, wherein the first packet extension field is the same as the second packet extension field, wherein the set of fields comprises the first packet extension field and a HE signal-A (HE-SIG-A) field, wherein a first HE-SIG-A field of the HE TB NDP comprises first parameters, wherein a second HE-SIG-A field of the downlink NDP comprises second parameters, wherein the first parameters are different from the second parameters. 
     
     
         8 . The device of  claim 1 , further comprising a transceiver configured to transmit and receive wireless signals, wherein the wireless signals comprise the trigger frame, the HE TB NDP, or the downlink NDP. 
     
     
         9 . The device of  claim 8 , further comprising an antenna coupled to the transceiver. 
     
     
         10 . A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors result in performing operations comprising:
 identifying a trigger frame received from a responding device;   determining, based on the trigger frame, a high efficiency (HE) long training field (HE-LTF) mode and a guard interval duration;   determining, based on the HE-LTF mode and the guard interval duration, a HE trigger-based (TB) null data packet (NDP), wherein the HE TB NDP comprises a first packet extension field;   causing to send the HE TB NDP to the responding device;   identifying a downlink NDP received from the responding device, wherein the downlink NDP comprises a second packet extension field; and   determining, based on the downlink NDP, channel state information.   
     
     
         11 . The non-transitory computer-readable medium of  claim 10 , wherein the HE-LTF mode is a 2× HE-LTF mode. 
     
     
         12 . The non-transitory computer-readable medium of  claim 10 , wherein the guard interval duration is 0.8 microseconds. 
     
     
         13 . The non-transitory computer-readable medium of  claim 10 , wherein the guard interval duration is 1.6 microseconds. 
     
     
         14 . The non-transitory computer-readable medium of  claim 10 , wherein the first packet extension field is greater than zero. 
     
     
         15 . The non-transitory computer-readable medium of  claim 10 , wherein the first packet extension field has a duration of 4 microseconds, wherein the HE TB NDP further comprises a first HE short training field (HE-STF), wherein the first HE-STF has a duration of 8 microseconds, wherein the downlink NDP comprises a second HE-STF, and wherein the second HE-STF has a duration of 4 microseconds. 
     
     
         16 . The non-transitory computer-readable medium of  claim 10 , wherein the HE TB NDP comprises a set of fields, wherein the downlink NDP is a HE sounding NDP, wherein the downlink HE sounding NDP comprises the set of fields, wherein the first packet extension field is the same as the second packet extension field, wherein the set of fields comprises the first packet extension field and a HE signal-A (HE-SIG-A) field, wherein a first HE-SIG-A field of the HE TB NDP comprises first parameters, wherein a second HE-SIG-A field of the downlink HE sounding NDP comprises second parameters, wherein the first parameters are different from the second parameters. 
     
     
         17 . A method comprising:
 causing to send, by an initiator device, a null data packet announcement (NDPA) frame to a responder device;   determining, by the initiator device, an uplink null data packet (NDP), wherein the uplink NDP comprises a first indication of a high efficiency (HE) long training field (HE-LTF) mode, a second indication of a guard interval duration, and a first packet extension field;   causing to send, by the initiator device, the uplink NDP to the responder device;   identifying, by the initiator device, an downlink NDP received from the responder device, wherein the downlink NDP comprises a second packet extension field and a HE signal-A1 (HE-SIG-A1) field, wherein the downlink NDP is associated with the HE-LTF mode and the guard interval duration indicated in the HE-SIG-A1 field; and   determining, by the initiator device, channel state information based on the downlink NDP received from the responder device.   
     
     
         18 . The method of  claim 17 , wherein the uplink NDP is a first HE sounding NDP frame, and wherein the downlink NDP is a second HE sounding NDP frame. 
     
     
         19 . The method of  claim 17 , wherein the HE-LTF mode is a 2× HE-LTF mode. 
     
     
         20 . The method of  claim 17 , wherein the guard interval duration is 0.8 microseconds or 1.6 microseconds, wherein the first packet extension field has a duration of 4 microseconds, wherein the second packet extension field has a duration of 4 microseconds, and wherein a first bit of the HE-SIG-A1 field of the downlink NDP is set to zero to indicate that the downlink NDP is a HE trigger-based data unit.