Technique for configuring preamble in wireless communication system
An example according to the present specification relates to a technique relating to a configuration of a preamble in a wireless LAN (WLAN) system. A reception STA can receive a PPDU. The reception STA can perform a modulo operation with respect to whether or not an L-SIG field is repeated and a value of a length field. The reception STA can determine the received PPDU as an EHT PPDU on the basis of the modulo operation with respect to whether or not the L-SIG field is repeated and the value of the length field.
1. A method performed by a station (STA) in a wireless local area network system, the method comprising:
receiving a physical protocol data unit (PPDU) comprising a legacy-signal (L-SIG) field;
determining whether the PPDU comprises a repeated L-SIG (RL-SIG) field which is a repeat of the L-SIG field, wherein the RL-SIG is contiguous to the L-SIG field; and
after determining that the PPDU comprises the RL-SIG field, determining whether a length field included in the L-SIG field is set to a value satisfying a condition that a remainder is zero when a value of the length field is divided by three (3), wherein the remainder is used to differentiate an extreme high throughput (EHT) PPDU from a high efficiency (HE) PPDU,
wherein the PPDU is determined as the EHT PPDU based on the remainder having a value of zero (0), and the PPDU is determined as the HE PPDU based on the remainder having a non-zero value.
2. The method of claim 1 , further comprising:
after determining the length field is set to the value satisfying the condition, evaluating a physical version field comprised in a universal signal (U-SIG) field of the PPDU, wherein the physical version field has a length of three (3) bits.
3. The method of claim 2 , wherein the universal signal (U-SIG) field further comprises information related to a basic service set (BSS) color of the PPDU and/or information related to a bandwidth of the PPDU.
4. The method of claim 1 , wherein binary phase shift keying (BPSK) modulation is applied to the L-SIG field and the RL-SIG field.
5. The method of claim 1 , wherein the value of the length field is related to a transmission time of the PPDU.
6. The method of claim 1 , wherein the STA is an access point (AP) STA or a non-AP STA.
7. A station (STA) in wireless local area network (WLAN) system, the receiving STA comprising:
a transceiver to transmit and receive a wireless signal; and
a processor coupled to the transceiver,
wherein the processor is adapted to:
receive a physical protocol data unit (PPDU) comprising a legacy-signal (L-SIG) field;
determine whether the PPDU comprises a repeated L-SIG (RL-SIG) field which is a repeat of the L-SIG field, wherein the RL-SIG is contiguous to the L-SIG field; and
after determining that the PPDU comprises the RL-SIG field, determine whether a length field included in the L-SIG field is set to a value satisfying a condition that a remainder is zero when a value of the length field is divided by three (3), wherein the remainder is used to differentiate an extreme high throughput (EHT) PPDU from a high efficiency (HE) PPDU,
wherein the PPDU is determined as the EHT PPDU based on the remainder having a value of zero (0), and the PPDU is determined as the HE PPDU based on the remainder having a non-zero value.
8. The STA of claim 7 , wherein the processor is further adapted to:
after determining the length field is set to the value satisfying the condition, evaluate a physical version field comprised in a universal signal (U-SIG) field of the PPDU, wherein the physical version field has a length of three (3) bits.
9. The STA of claim 8 , wherein the universal signal (U-SIG) field further comprises information related to a basic service set (BSS) color of the PPDU and/or information related to a bandwidth of the PPDU.
10. The STA of claim 7 , wherein binary phase shift keying (BPSK) modulation is applied to the L-SIG field and the RL-SIG field.
11. The STA of claim 7 , wherein the value of the length field is related to a transmission time of the PPDU.
12. The STA of claim 7 , wherein the STA is an access point (AP) STA or a non-AP STA.