Utilization of null tones for urgent data transmission in Wi-Fi network
The present application provides an apparatus including RF interface circuitry; and processor circuitry coupled with the RF interface circuitry and configured to: generate a PPDU carrying urgent data to be transmitted by the apparatus; provide the PPDU to the RF interface circuitry for transmission to a receiver of the PPDU. The urgent data may be carried over one or more null tones in the PPDU.
1 . An apparatus, comprising:
radio frequency (RF) interface circuitry; and
processor circuitry coupled with the RF interface circuitry and configured to:
generate a Physical Protocol Data Unit (PPDU) carrying urgent data to be transmitted by the apparatus;
provide the PPDU to the RF interface circuitry for transmission to a receiver of the PPDU,
wherein the urgent data is carried over one or more null tones in the PPDU, the one or more null tones are determined based on a bandwidth of the PPDU and a transmission mode of the PPDU, and the bandwidth of the PPDU and the transmission mode of the PPDU are indicated by a universal signaling field (U-SIG) in a preamble of the PPDU.
2 . The apparatus of claim 1 , wherein when the bandwidth of the PPDU is 80 MHz and the transmission mode of the PPDU is Orthogonal Frequency-Division Multiple Access (OFDMA) transmission, the one or more null tones are selected from a pre-specified null tone set comprising 18 Direct Current (DC) tones, 5 null tones in a lower bandwidth of 40 MHz and 5 null tones in an upper bandwidth of 40 MHz in the PPDU.
3 . The apparatus of claim 1 , wherein when the bandwidth of the PPDU is 160 MHz and the transmission mode of the PPDU is Orthogonal Frequency-Division Multiple Access (OFDMA) transmission, the one or more null tones are selected from a pre-specified null tone set comprising 18 Direct Current (DC) tones, 33 null tones in a lower bandwidth of 80 MHz and 33 null tones in an upper bandwidth of 80 MHz in the PPDU.
4 . The apparatus of claim 1 , wherein when the bandwidth of the PPDU is 160 MHz and the transmission mode of the PPDU is non-Orthogonal Frequency-Division Multiple Access (non-OFDMA) transmission, the one or more null tones are selected from a pre-specified null tone set comprising 18 Direct Current (DC) tones, 5 null tones in a lower bandwidth of 80 MHz and 5 null tones in an upper bandwidth of 80 MHz in the PPDU.
5 . The apparatus of claim 1 , wherein when the bandwidth of the PPDU is 320 MHz and the transmission mode of the PPDU is Orthogonal Frequency-Division Multiple Access (OFDMA) transmission, the one or more null tones are selected from a pre-specified null tone set comprising 18 Direct Current (DC) tones, 89 null tones in a lower bandwidth of 160 MHz and 89 null tones in an upper bandwidth of 160 MHz in the PPDU.
6 . The apparatus of claim 1 , wherein when the bandwidth of the PPDU is 320 MHz and the transmission mode of the PPDU is non-Orthogonal Frequency-Division Multiple Access (non-OFDMA) transmission, the one or more null tones are selected from a pre-specified null tone set comprising 18 Direct Current (DC) tones, 33 null tones in a lower bandwidth of 160 MHz and 33 null tones in an upper bandwidth of 160 MHz in the PPDU.
7 . The apparatus of claim 1 , wherein the PPDU comprises the preamble, the urgent data carried over the one or more null tones, and regular data carried over resource units (RUs) in the PPDU, the preamble comprises information for the receiver to estimate a channel on the one or more null tones, and a waveform of the urgent data is orthogonal in a frequency domain to a waveform of the regular data.
8 . The apparatus of claim 7 , wherein the apparatus is applied in an Access Point (AP) or a non-Access Point Station (non-AP STA) having already obtained a Transmission Opportunity (TxOP).
9 . The apparatus of claim 7 , wherein the apparatus is applied in a non-Access Point Station (non-AP STA) triggered to transmit data by an Access Point (AP) having already obtained a Transmission Opportunity (TxOP).
10 . The apparatus of claim 9 , wherein the processor circuitry is further configured to synchronize the non-AP STA with the AP based on a trigger frame from the AP.
11 . The apparatus of claim 9 , wherein the AP is in a same basic service set (BSS) or an overlapping BSS with the non-AP STA.
12 . The apparatus of claim 1 , wherein the apparatus is applied in an Access Point (AP) or a non-Access Point Station (non-AP STA) in a managed synchronized network where all wireless devices are time and frequency synchronized to a central controller.
13 . The apparatus of claim 12 , wherein when the AP or the non-AP STA uses a fixed channel bandwidth for data transmission, the one or more null tones are selected from a common null tone set pre-specified for all the wireless devices in the managed synchronized network.
14 . A method, comprising:
generating a Physical Protocol Data Unit (PPDU) carrying urgent data to be transmitted;
transmitting the PPDU to a receiver of the PPDU,
wherein the urgent data is carried over one or more null tones in the PPDU, the one or more null tones are determined based on a bandwidth of the PPDU and a transmission mode of the PPDU, and the bandwidth of the PPDU and the transmission mode of the PPDU are indicated by a universal signaling field (U-SIG) in a preamble of the PPDU.
15 . A non-transitory computer-readable medium having instructions stored thereon, wherein the instructions, when executed by processor circuitry, cause the processor circuitry to perform the method of claim 14 .