Technique for configuring preamble in wireless communication system
An example according to the present specification relates to a technique for configuring a preamble in a wireless LAN (WLAN) system. A transmitting STA may generate and transmit an EHT PPDU. The EHT PPDU may comprise an L-SIG field, an RL-SIG field, a first control field, and a second control field. A result of “modulo 3 operation” for a length field value of the L-SIG field may be set to “0.” The RL-SIG field may be configured to be the same as the L-SIG field. The first control field may comprise 3-bit information on the version of a PPDU, 6-bit information on a BSS color, and 7-bit information on TXOP.
1. A method performed by a transmitting station (STA) in a Wireless Local Area Network (WLAN) system, the method comprising:
generating an Extremely High Throughput (EHT) Physical Protocol Data Unit (PPDU) including a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field, a control signal field being contiguous to the RL-SIG field, an EHT Short Training Field (STF), and an EHT Long Training Field (LTF) which is contiguous to the EHT STF,
wherein the L-SIG field includes a length field, the length field is set to a value satisfying a condition that a remainder is zero when the length field is divided by three, and the remainder differentiates the EHT PPDU from a High Efficiency (HE) PPDU,
wherein the RL-SIG field is a repeat of the L-SIG field and is contiguous to the L-SIG field,
wherein the RL-SIG field and the control signal field are configured based on Binary Phase-Shift Keying (BPSK),
wherein the control signal field includes first information related to a physical version of the EHT PPDU, second information related to a bandwidth of the EHT PPDU, third information related to a basic service set (BSS) color, fourth information related to a transmission opportunity (TXOP), and fifth information related to a PPDU type,
wherein the fifth information has a length of two bits, and a value of the fifth information indicates a single user (SU) transmission or a trigger-based (TB) PPDU, and
wherein the first information has a length of three bits and is set to zero for the EHT PPDU; and
transmitting the EHT PPDU.
2. The method of claim 1 , wherein the fifth information is set to one to indicate the SU transmission.
3. A transmitting station (STA) in a Wireless Local Area Network (WLAN) system comprising:
a transceiver configured to transmit and/or receive a wireless signal; and
a processor coupled to the transceiver,
wherein the processor is further configured to:
generate an Extremely High Throughput (EHT) Physical Protocol Data Unit (PPDU) including a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field, a control signal field being contiguous to the RL-SIG field, an EHT Short Training Field (STF), and an EHT Long Training Field (LTF) which is contiguous to the EHT STF,
wherein the L-SIG field includes a length field, the length field is set to a value satisfying a condition that a remainder is zero when the length field is divided by three, and the remainder differentiates the EHT PPDU from a High Efficiency (HE) PPDU,
wherein the RL-SIG field is a repeat of the L-SIG field and is contiguous to the L-SIG field,
wherein the RL-SIG field and the control signal field are configured based on Binary Phase-Shift Keying (BPSK),
wherein the control signal field includes first information related to a physical version of the EHT PPDU, second information related to a bandwidth of the EHT PPDU, third information related to a basic service set (BSS) color, fourth information related to a transmission opportunity (TXOP), and fifth information related to a PPDU type,
wherein the fifth information has a length of two bits, and a value of the fifth information indicates a single user (SU) transmission or a trigger-based (TB) PPDU, and
wherein the first information has a length of three bits and is set to zero for the EHT PPDU; and
transmit the EHT PPDU.
4. The STA of claim 3 , wherein the fifth information is set to one to indicate the SU transmission.
5. A receiving station (STA) in a Wireless Local Area Network (WLAN) system comprising:
a transceiver configured to transmit and/or receive a wireless signal; and
a processor coupled to the transceiver,
wherein the processor is further configured to:
receive an Extremely High Throughput (EHT) Physical Protocol Data Unit (PPDU) including a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field, a control signal field being contiguous to the RL-SIG field, an EHT Short Training Field (STF), and an EHT Long Training Field (LTF) which is contiguous to the EHT STF,
wherein the L-SIG field includes a length field, the length field is set to a value satisfying a condition that a remainder is zero when the length field is divided by three, and the remainder differentiates the EHT PPDU from a High Efficiency (HE) PPDU,
wherein the RL-SIG field is a repeat of the L-SIG field and is contiguous to the L-SIG field,
wherein the RL-SIG field and the control signal field are configured based on Binary Phase-Shift Keying (BPSK),
wherein the control signal field includes first information related to a physical version of the EHT PPDU, second information related to a bandwidth of the EHT PPDU, third information related to a basic service set (BSS) color, fourth information related to a transmission opportunity (TXOP), and fifth information related to a PPDU type,
wherein the fifth information has a length of two bits, and a value of the fifth information indicates a single user (SU) transmission or a trigger-based (TB) PPDU, and
wherein the first information has a length of three bits and is set to zero for the EHT PPDU.
6. The receiving STA of claim 5 , wherein the fifth information is set to one to indicate the SU transmission.