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, the device comprising processing circuitry coupled to storage, the processing circuitry configured to:
 send a trigger frame to one or more initiator devices to solicit uplink sounding null data packet (NDP) feedbacks   identify a first HE trigger-based (TB) NDP feedback received from a first initiator device, wherein the HE TB NDP feedback comprises a first packet extension field and does not contain a data field, wherein the HE TB NDP has a supported HE-LTF mode of 2x HE-LTF with a 1.6 microseconds guard interval duration; and   send a null data packet announcement (NDPA) to the one or more initiator devices.   
     
     
         2 . The device of  claim 1 , wherein the NDPA is followed by one or more downlink NDPs to the one or more initiator devices. 
     
     
         3 . The device of  claim 2 , wherein the one or more downlink NDPs are followed by a measurement report frame sent to the one or more initiator devices. 
     
     
         4 . The device of  claim 2 , wherein the NDPA is sent after a passage of a short inter-frame space (SIFS) from receiving a last NDP from the one or more initiator devices. 
     
     
         5 . The device of  claim 2 , wherein the HE TB NDP only supports the HE-LTF mode of 2x HE-LTF with the 1.6 microseconds guard interval duration. 
     
     
         6 . The device of  claim 1 , wherein the processing circuitry is further configured to identify a second HE TB NDP feedback received from a second initiator device, wherein the second HE TB NDP feedback comprises a second packet extension field and does not contain a data field, wherein the second HE TB NDP has a supported HE-LTF mode of 2x HE-LTF with a 1.6 microseconds guard interval duration. 
     
     
         7 . The device of  claim 1 , wherein the first packet extension field is 4 microseconds, wherein the HE TB NDP further comprises a first sounding HE short training field (HE-STF), wherein the first sounding HE-STF included in the HE TB NDP has a duration of 8 microseconds for sounding. 
     
     
         8 . The device of  claim 1 , further comprising a transceiver configured to transmit and receive wireless signals. 
     
     
         9 . The device of  claim 8 , further comprising an antenna coupled to the transceiver to cause to send the trigger frame. 
     
     
         10 . A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors result in performing operations comprising:
 sending a trigger frame to one or more initiator devices to solicit uplink sounding null data packet (NDP) feedbacks   identifying a first HE trigger-based (TB) NDP feedback received from a first initiator device, wherein the HE TB NDP feedback comprises a first packet extension field and does not contain a data field, wherein the HE TB NDP has a supported HE-LTF mode of 2x HE-LTF with a 1.6 microseconds guard interval duration; and   sending a null data packet announcement (NDPA) to the one or more initiator devices.   
     
     
         11 . The non-transitory computer-readable medium of  claim 10 , wherein the NDPA is followed by one or more downlink NDPs to the one or more initiator devices. 
     
     
         12 . The non-transitory computer-readable medium of  claim 11 , wherein the one or more downlink NDPs are followed by a measurement report frame sent to the one or more initiator devices. 
     
     
         13 . The non-transitory computer-readable medium of  claim 11 , wherein the NDPA is sent after a passage of a short inter-frame space (SIFS) from receiving a last NDP from the one or more initiator devices. 
     
     
         14 . The non-transitory computer-readable medium of  claim 11 , wherein the HE TB NDP only supports the HE-LTF mode of 2x HE-LTF with the 1.6 microseconds guard interval duration. 
     
     
         15 . The non-transitory computer-readable medium of  claim 10 , wherein the operations further comprise identifying a second HE TB NDP feedback received from a second initiator device, wherein the second HE TB NDP feedback comprises a second packet extension field and does not contain a data field, wherein the second HE TB NDP has a supported HE-LTF mode of 2x HE-LTF with a 1.6 microseconds guard interval duration. 
     
     
         16 . The non-transitory computer-readable medium of  claim 10 , wherein the first packet extension field is 4 microseconds, wherein the HE TB NDP further comprises a first sounding HE short training field (HE-STF), wherein the first sounding HE-STF included in the HE TB NDP has a duration of 8 microseconds for sounding. 
     
     
         17 . A method comprising:
 sending a trigger frame to one or more initiator devices to solicit uplink sounding null data packet (NDP) feedbacks   identifying a first HE trigger-based (TB) NDP feedback received from a first initiator device, wherein the HE TB NDP feedback comprises a first packet extension field and does not contain a data field, wherein the HE TB NDP has a supported HE-LTF mode of 2x HE-LTF with a 1.6 microseconds guard interval duration; and   sending a null data packet announcement (NDPA) to the one or more initiator devices.   
     
     
         18 . The method of  claim 17 , wherein the NDPA is followed by one or more downlink NDPs to the one or more initiator devices. 
     
     
         19 . The method of  claim 18 , wherein the one or more downlink NDPs are followed by a measurement report frame sent to the one or more initiator devices. 
     
     
         20 . The method of  claim 18 , wherein the NDPA is sent after a passage of a short inter-frame space (SIFS) from receiving a last NDP from the one or more initiator devices.