High-efficiency (HE) station and method for configuring HE packets with long and short preamble formats
View Patent ↗Apparatuses, methods, and computer readable media are disclosed. A HE station may include circuitry. The circuitry may be configured to: generate a HE packet with a short preamble format or a long preamble format, wherein the HE packet comprises one or more legacy signal (L-SIG) fields followed by one or more HE signal fields (HE-SIG) and an HE long-training field (HE-LTF); and configure the HE packet to indicate whether the HE packet is configured with the short preamble format or the long preamble format. The HE packet may be configured with the short preamble format or the long preamble format based on one from the following group: a symbol after the L-SIG fields, a L-SIG polarity of a repeated L-SIG, a number of times the L-SIG fields is repeated, or a length field of one of the one or more L-SIG fields.
1. An apparatus comprising: memory; and, processing circuitry coupled to the memory, the processing circuitry configured to:
encode a preamble for high-efficiency (HE) Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU), the preamble comprising a legacy portion comprising a legacy signal (L-SIG) field, the L-SIG field comprising a length field, wherein a modulo 3 of a value of the length field equal to 0 indicates the preamble does not comprise a HE preamble portion, and further encode the preamble to comprise a repeat L-SIG field after the L-SIG field with a same symbol rotation as the L-SIG to indicate the preamble comprises the HE preamble portion, wherein the modulo 3 of the value of the length field equal to 2 indicates a first HE-SIG-A format or a second HE-SIG-A format, wherein a rotation of a symbol after the L-SIG field indicates the first HE-SIG-A format or the second HE-SIG-A format, and wherein the first HE-SIG-A format comprises a first two symbols and a repeat of the first two symbols, and the second HE-SIG-A format comprises a second two symbols;
if the rotation of the symbol after the L-SIG field indicates the second HE-SIG-A format, encode the HE preamble portion to comprise a HE-SIG-A field having a duration of 8 μs and to further comprise a HE-SIG-B field with a number of symbols, wherein the number of symbols is variable; and
configure the HE PPDU, to include the preamble, for transmission by a wireless device.
2. The apparatus of claim 1 , wherein the processing circuitry is further configured to:
if the L-SIG field indicates the first HE SIG A format, encode the HE preamble portion to comprise a HE-SIG-A1, a repeat HE-SIG-A1, a HE-SIG-A2, and a repeat HE-SIG-A2.
3. The apparatus of claim 2 , wherein the processing circuitry is further configured to:
if the L-SIG field indicates the first HE-SIG-A format, encode the HE preamble portion to comprise the HE-SIG-A having a duration of 8 μs.
4. The apparatus of claim 1 , wherein the first HE-SIG-A format is for outdoor use.
5. The apparatus of claim 1 , wherein the wireless device is an Institute of Electrical and Electronic Engineers (IEEE) 802.11 ax access point or an IEEE 802.11 ax station.
6. The apparatus of claim 1 , wherein the length field is 12 bits.
7. The apparatus of claim 1 , further comprising transceiver circuitry coupled to the processing circuitry.
8. The apparatus of claim 7 , further comprising one or more antennas coupled to the transceiver circuitry.
9. The apparatus of claim 1 , wherein a modulo 3 of a value of the length field equal to 1 or equal to 2 indicates the preamble comprises a HE preamble portion.
10. A method performed by an apparatus, the method comprising:
encoding a preamble for high-efficiency (HE) Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU), the preamble comprising a legacy portion comprising a legacy signal (L-SIG) field, the L-SIG field comprising a length field, wherein a modulo 3 of a value of the length field equal to 0 indicates the preamble does not comprise a HE preamble portion, and further encode the preamble to comprise a repeat L-SIG after the L-SIG field with a same symbol rotation as the L-SIG to indicate the preamble comprises the HE preamble portion, wherein the modulo 3 of the value of the length field equal to 2 indicates a first HE-SIG-A format or a second HE-SIG-A format, wherein a rotation of a symbol after the L-SIG field indicates the first HE-SIG-A format or the second HE-SIG-A format, and wherein the first HE-SIG-A format comprises a first two symbols and a repeat of the first two symbols, and the second HE-SIG-A format comprises a second two symbols;
if the rotation of the symbol after the L-SIG field indicates the second HE-SIG-A format, encode the HE preamble portion to comprise a HE-SIG-A field having a duration of 8 μs and to further comprise a HE-SIG-B field with a number of symbols, wherein the number of symbols is variable; and
configuring the HE PPDU, to include the preamble, for transmission by a wireless device.
11. The method of claim 10 , the method further comprising:
if the one or more L-SIG fields indicate the first HE SIG A format, encoding the HE preamble portion to comprise a HE-SIG-A1, a repeat HE-SIG-A1, a HE-SIG-A2, and a repeat HE-SIG-A2.
12. An apparatus comprising: memory; and processing circuitry coupled to the memory, the processing circuitry configured to:
decode a preamble for a high-efficiency (HE) Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU), the preamble comprising a legacy portion comprising a signal (L-SIG) field, the L-SIG field comprising a length field, wherein a modulo 3 of a value of the length field equal to 1 or equal to 2 indicates the PPDU is a HE PPDU, and the preamble further comprising a repeat L-SIG after the L-SIG field, wherein a same symbol rotation of the repeat L-SIG as the L-SIG indicates the PPDU is the HE PPDU,
if a rotation of a symbol after the L-SIG field indicates the first HE-SIG-A format, decode the HE preamble portion, wherein the HE preamble portion comprises a HE-SIG-A and a repeated HE-SIG-A, and wherein the repeated HE-SIG-A is to be a repeat of the HE-SIG-A in time;
if the rotation of the symbol after the L-SIG field indicates the second HE-SIG-A format, decode the HE preamble portion to comprise a HE-SIG-A field having a duration of 8 μs and to further comprise a HE-SIG-B field with K2 symbols, wherein K2 is variable; and
if the rotation of the symbol after the L-SIG field indicates the second HE SIG A format, decode the HE preamble portion, wherein the HE preamble portion comprises a single instance of the HE-SIG-A.
13. The apparatus of claim 12 , further comprising transceiver circuitry coupled to the processing circuitry; and, one or more antennas coupled to the transceiver circuitry.