Trigger frame
The present specification proposes an improved trigger frame structure for triggering a plurality of STAs and a method for allocating bandwidths and RUs to the plurality of STAs on the basis of the improved trigger frame structure. Here, according to an embodiment of the present specification, the plurality of STAs may be STAs supporting different standards. Also, according to another embodiment of the present specification, TB PPDUs transmitted by the plurality of STAs on the basis of the improved trigger frame structure may be A-PPDUs.
1 . A method in a Wireless Local Area Network (WLAN) system, the method comprising:
receiving, by first and second receiving stations (STAs), a trigger frame from a transmitting STA; and
transmitting, by the first and second receiving STAs, a trigger-based (TB) aggregated-physical protocol data unit (A-PPDU) to the transmitting STA,
wherein the TB A-PPDU is an aggregated PPDU of a first TB PPDU for the first receiving STA and a second TB PPDU for the second receiving STA,
wherein the trigger frame includes first and second user information fields,
wherein the first user information field includes a first Resource Unit (RU) allocation subfield including information on an RU for the first receiving STA,
wherein the second user information field includes a second RU allocation subfield including information on an MRU for the second receiving STA,
wherein the second RU allocation subfield consisting of 9 bits includes information on a number of 3×996+484+242-tone Multiple Resource Units (MRUs) and an allocation pattern of the 3×996+484+242-tone MRUs,
wherein the number of the 3×996+484+242-tone MRUs is 16, and
wherein the allocation pattern of the 3×996+484+242-tone MRUs is determined based on a puncturing position of a 242-tone RU.
2 . The method of claim 1 , wherein the trigger frame further includes a common information field,
wherein the common information field includes an uplink bandwidth subfield including information on a first bandwidth of the first TB PPDU.
3 . The method of claim 2 , wherein the trigger frame further includes a special user information field,
wherein the special user information field includes an uplink bandwidth extension subfield, and
wherein a second bandwidth of the second TB PPDU is determined based on the uplink bandwidth subfield and the uplink bandwidth extension subfield.
4 . The method of claim 3 , wherein the second bandwidth is determined to be a 320 MHz bandwidth,
wherein the 9 bits is {X8, X7, X6, X5, X4, X3, X2, X1, X0}, and
wherein based on indexes of the 3×996+484+242-tone MRUs being MRU1 to MRU16:
X0=0, X1=0 and {X8, X7, . . . X2}=107 indicate MRU1,
X0=0, X1=0 and {X8, X7, . . . X2}=108 indicate MRU2,
X0=0, X1=0 and {X8, X7, . . . X2}=109 indicate MRU3,
X0=0, X1=0 and {X8, X7, . . . X2}=110 indicate MRU4,
X0=0, X1=1 and {X8, X7, . . . X2}=107 indicate MRU5,
X0=0, X1=1 and {X8, X7, . . . X2}=108 indicate MRU6,
X0=0, X1=1 and {X8, X7, . . . X2}=109 indicate MRU7,
X0=0, X1=1 and {X8, X7, . . . X2}=110 indicate MRU8,
X0=1, X1=0 and {X8, X7, . . . X2}=107 indicate MRU9,
X0=1, X1=0 and {X8, X7, . . . X2}=108 indicate MRU10,
X0=1, X1=0 and {X8, X7, . . . X2}=109 indicate MRU11,
X0=1, X1=0 and {X8, X7, . . . X2}=110 indicate MRU12,
X0=1, X1=1 and {X8, X7, . . . X2}=107 indicate MRU13,
X0=1, X1=1 and {X8, X7, . . . X2}=108 indicate MRU14,
X0=1, X1=1 and {X8, X7, . . . X2}=109 indicate MRU15, and
X0=1, X1=1 and {X8, X7, . . . X2}=110 indicate MRU16.
5 . The method of claim 1 , wherein the first TB PPDU is a high efficiency (HE) TB PPDU and the second TB PPDU is an extremely high throughput (EHT) TB PPDU.
6 . The method of claim 1 , wherein the first receiving STA is an HE STA and the second receiving STA is an EHT STA.
7 . First and second receiving stations (STAs) in a Wireless Local Area Network (WLAN) system, comprising:
a memory;
a transceiver; and
a processor operatively coupled to the memory and the transceiver,
wherein the processor is adapted to:
receive a trigger frame from a transmitting STA, and
transmit, a trigger-based (TB) aggregated-physical protocol data unit (A-PPDU) to the transmitting STA,
wherein the TB A-PPDU is an aggregated PPDU of a first TB PPDU for the first receiving STA and a second TB PPDU for the second receiving STA,
wherein the trigger frame includes first and second user information fields,
wherein the first user information field includes a first Resource Unit (RU) allocation subfield including information on an RU for the first receiving STA,
wherein the second user information field includes a second RU allocation subfield including information on an MRU for the second receiving STA,
wherein the second RU allocation subfield consisting of 9 bits includes information on a number of 3×996+484+242-tone Multiple Resource Units (MRUs) and an allocation pattern of the 3×996+484+242-tone MRUs,
wherein the number of the 3×996+484+242-tone MRUs is 16, and
wherein the allocation pattern of the 3×996+484+242-tone MRUs is determined based on a puncturing position of a 242-tone RU.
8 . A method in a Wireless Local Area Network (WLAN) system, the method comprising:
transmitting, by a transmitting station (STA), a trigger frame to first and second receiving STAs, and
receiving, by the transmitting STA, a trigger-based (TB) aggregated-physical protocol data unit (A-PPDU) from the first and second receiving STAs,
wherein the TB A-PPDU is an aggregated PPDU of a first TB PPDU for the first receiving STA and a second TB PPDU for the second receiving STA,
wherein the trigger frame includes first and second user information fields,
wherein the first user information field includes a first Resource Unit (RU) allocation subfield including information on an RU for the first receiving STA,
wherein the second user information field includes a second RU allocation subfield including information on an MRU for the second receiving STA, and
wherein the second RU allocation subfield consisting of 9 bits includes information on a number of 3×996+484+242-tone Multiple Resource Units (MRUs) and an allocation pattern of the 3×996+484+242-tone MRUs,
wherein the number of the 3×996+484+242-tone MRUs is 16, and
wherein the allocation pattern of the 3×996+484+242-tone MRUs is determined based on a puncturing position of a 242-tone RU.
9 . The method of claim 8 , wherein the trigger frame further includes a common information field,
wherein the common information field includes an uplink bandwidth subfield including information on a first bandwidth of the first TB PPDU.
10 . The method of claim 9 , wherein the trigger frame further includes a special user information field,
wherein the special user information field includes an uplink bandwidth extension subfield, and
wherein a second bandwidth of the second TB PPDU is determined based on the uplink bandwidth subfield and the uplink bandwidth extension subfield.