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WO2016154951A1 - Procédé de transmission de données et dispositif de transmission - Google Patents

Procédé de transmission de données et dispositif de transmission Download PDF

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Publication number
WO2016154951A1
WO2016154951A1 PCT/CN2015/075628 CN2015075628W WO2016154951A1 WO 2016154951 A1 WO2016154951 A1 WO 2016154951A1 CN 2015075628 W CN2015075628 W CN 2015075628W WO 2016154951 A1 WO2016154951 A1 WO 2016154951A1
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Prior art keywords
sig
physical layer
layer packet
ofdm symbol
feature sequence
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PCT/CN2015/075628
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English (en)
Chinese (zh)
Inventor
刘晟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201580078520.7A priority Critical patent/CN107529354B/zh
Priority to PCT/CN2015/075628 priority patent/WO2016154951A1/fr
Publication of WO2016154951A1 publication Critical patent/WO2016154951A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention belongs to the field of communications technologies, and in particular, to a data transmission method and a transmission device.
  • the existing wireless local area network (English: Wireless Local Access Network, WLAN) standard based on OFDM (English: Orthogonal Frequency-Division Multiplexing) technology is gradually evolved by 802.11a, 802.11n, 802.11.
  • the ac and other versions are composed.
  • the IEEE (English: Institute of Electrical and Electronic Engineers) 802.11 standard organization has launched a new generation WLAN standard called HEW (High Efficiency WLAN).
  • the present invention provides a data transmission method and apparatus in a wireless local area network, which is used to solve the problem that an existing WLAN device cannot effectively distinguish an 802.11ax packet, an 802.11ac packet, and an 802.11n packet.
  • an embodiment of the present invention provides a data transmission method applied to a WLAN of a wireless local area network, including:
  • the physical layer packet including a legacy signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the OFDM symbol in frequency
  • the domain includes a plurality of data subcarriers, and the signal on the data subcarrier of the OFDM symbol is represented by a signal on the data subcarrier corresponding to the position of the L-SIG and a corresponding position of the feature sequence
  • the elements are multiplied to get;
  • the signal on the L-SIG data subcarrier is a binary phase shift keyed BPSK modulation symbol.
  • the number of data subcarriers of the L-SIG and the OFDM symbol is 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1
  • the protocol version corresponding to the feature sequence is an 802.11ax protocol. Or a subsequent evolution protocol.
  • the length of the feature sequence is the same as the number of data subcarriers of the L-SIG .
  • an embodiment of the present invention provides a data transmission method applied to a WLAN of a wireless local area network, including:
  • the parsing the physical layer packet includes: respectively, the signal on the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet is one by one and the feature sequence Multiplying each element, and multiplying the obtained signal with the signal on the L-SIG data subcarrier for cross-correlation processing;
  • Determining the protocol version of the physical layer packet specifically, if the result of the cross-correlation processing exceeds the first threshold, determining that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.
  • the number of data subcarriers of the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG and the L-SIG For 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1
  • the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
  • the length of the feature sequence and the data of the L-SIG is the same.
  • an embodiment of the present invention provides a data transmission apparatus applied to a WLAN of a wireless local area network, including:
  • a processing unit configured to generate a physical layer packet, where the physical layer packet includes a traditional signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the The OFDM symbol includes a plurality of data subcarriers in a frequency domain, and a signal on a data subcarrier of the OFDM symbol is multiplied by a signal on a data subcarrier of the L-SIG corresponding location and an element of a corresponding position of the feature sequence After getting
  • the signal on the L-SIG data subcarrier in the physical layer packet generated by the processing unit is a binary phase shift keying BPSK modulation symbol.
  • the L-SIG and the data subcarrier of the OFDM symbol in the physical layer packet generated by the processing unit The number is 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1
  • the protocol version corresponding to the feature sequence is an 802.11ax protocol. Or a subsequent evolution protocol.
  • the length of the feature sequence and the data subcarrier of the L-SIG is the same.
  • an embodiment of the present invention provides a data transmission apparatus applied to a WLAN of a wireless local area network, including:
  • a transceiver unit configured to receive a physical layer packet
  • the processing unit configured to parse the physical layer packet, specifically includes: a signal on a data subcarrier of a first orthogonal frequency division multiplexing OFDM symbol after a traditional signaling field L-SIG in the physical layer packet Multiplying each element of the feature sequence one by one, and multiplying the obtained signal with the signal on the L-SIG data subcarrier;
  • the processing unit configured to determine a protocol version of the physical layer packet, specifically includes: if the result of the cross-correlation processing exceeds the first threshold, determining that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.
  • the L-SIG in the data packet parsed by the processing unit and the first orthogonal frequency division multiplexing OFDM after the L-SIG The number of data subcarriers of the symbol is 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1
  • the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
  • the length of the feature sequence is the same as the number of data subcarriers of the L-SIG .
  • the signal on the data subcarrier of the first OFDM symbol after the L-SIG is determined by the signal on the data subcarrier corresponding to the position of the L-SIG and the corresponding position of the feature sequence.
  • the elements are multiplied, they are not repeated in the time domain or the frequency domain of the L-SIG, so that they are not subject to the misjudgment caused by the periodic interference signals.
  • the later version protocols of 802.11ax ie, subsequent version protocols
  • the feature sequence with which the 802.11ax specific feature sequence is cross-correlated can be adopted, and the automatic detection of the new version protocol can be implemented in the same manner, and the compatibility problem between different standards is solved. Therefore, the embodiment of the present invention ensures the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • Figure 3 is a constellation diagram of BPSK and QBPSK modulation.
  • 4 is a physical layer grouping structure diagram of 802.11ax.
  • FIG. 5 is a structural diagram of a WLAN physical layer grouping structure according to Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart of a method according to Embodiment 1 of the present invention.
  • Figure 7 shows the generation process of the scrambled RL-SIG field.
  • FIG. 8 is a schematic diagram of automatic detection of an 802.11ax physical layer packet according to Embodiment 1 of the present invention.
  • FIG. 9 is a logical structural diagram of a station in Embodiment 2 of the present invention.
  • FIG. 10 is a logical structural diagram of a station in Embodiment 3 of the present invention.
  • FIG. 11 is a physical structural diagram of a transmitting station according to Embodiment 4 of the present invention.
  • Figure 12 is a diagram showing the physical structure of a receiving station according to Embodiment 4 of the present invention.
  • the embodiments of the present invention can be applied to a WLAN.
  • the standard adopted by the WLAN is the IEEE 802.11 series.
  • the WLAN may include multiple basic service sets (English: Basic Service Set, BSS for short).
  • the network nodes in the basic service set are stations (English: Station, abbreviated as STA).
  • the site includes the access point class (abbreviation: AP). , English: Access Point) and non-access point class sites (English: None Access Point Station, referred to as: Non-AP STA).
  • Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
  • Access point class sites also known as wireless access points or hotspots.
  • the AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the AP may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip.
  • the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Non-access point class site (English: None Access Point Station, referred to as Non-AP STA), which may be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • Non-AP STA may be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • mobile phone supporting WiFi communication function tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, smart wearable device supporting WiFi communication function, and vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication.
  • the site can support the 802.11ax system. Further optionally, the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Figure 1 is a system diagram of a typical WLAN deployment scenario, including an AP and three STAs, and the AP communicates with STA1, STA2, and STA3, respectively.
  • FIG. 2 shows the physical layer grouping structures of 802.11a, 802.11n and 802.11ac in the prior art, wherein the first part of them is the traditional preamble (English: Legacy Preamble), which is a traditional short training field (L-STF), a traditional long training field (L-LTF) and a traditional signaling field (English: Legacy) A field consisting of a Signal field (L-SIG for short).
  • the 802.11a physical layer packet is the data field after the traditional preamble, and the 802.11n and 802.11ac physical layer packets are between the traditional preamble and the data field, and a protocol-specific preamble is added.
  • the protocol specific preamble of the 802.11n physical layer packet is composed of a high throughput signaling field (English: High Throughput Signal Field, HT-SIG) and a high throughput short training field (English: High Throughput Short Training Field, HT- STF) and High Throughput Long Training Field (HT-LTF);
  • the protocol-specific preamble of the 802.11ac physical layer packet consists of Very High Throughput Signaling A field (English: Very High Throughput Signal) -A field (VHT-SIG-A for short), Very High Throughput Short Training Field (VHT-STF), Very High Throughput Long Training Field (English: Very High Throughput Long Training) Field (VHT-LTF for short) and Very High Throughput Signaling B field (English: Very High Throughput Signal-B field, VHT-SIG-B for short).
  • each OFDM symbol includes a cyclic prefix (English: Cyclic Prefix, CP for short). 4 microseconds, typically, the cyclic prefix length is 0.8 microseconds.
  • the L-SIG has only one OFDM symbol, the HT-SIG.
  • VHT-SIG-A each includes two OFDM symbols, each OFDM symbol includes 64 subcarriers in the frequency domain, wherein there are 48 data subcarriers for carrying modulation symbols of corresponding physical layer control information.
  • the modulation symbols carried on the data subcarriers of the two OFDM symbols of the HT-SIG are modulated by Quadrature Binary Phase Shift Keying (QBPSK); wherein QBPSK modulation is compared
  • QBPSK modulation is compared
  • the binary phase shift keying (English: Binary Phase Shift Keying, BPSK for short) constellation is rotated by 90 degrees.
  • the constellation diagrams of BPSK and QBPSK modulation are shown in Fig. 3. The figure on the left of Fig. 3 is BPSK modulation. 3 The drawing on the right is QBPSK modulation.
  • the receiver of 802.11n can be characterized according to the first OFDM symbol after the L-SIG of the received WLAN physical layer packet, ie Whether the modulation symbols carried on the 48 data subcarriers are QBPSK modulation to distinguish the physical layer packets of 802.11n and 802.11a.
  • the modulation symbols carried on the data subcarriers of the second OFDM symbol of the VHT-SIG-A are also QBPSK modulated, but the modulation symbols carried on the data subcarriers of the first OFDM symbol are BPSK modulated.
  • the 802.11n receiver does not consider the physical layer packet of 802.11ac as the physical layer packet of 802.11n, and the 802.11ac receiver can group the first OFDM symbol after the L-SIG according to the received WLAN physical layer. Whether the modulation symbols carried on the 48 data subcarriers are QBPSK modulation to distinguish the physical layer packets of 802.11ac and 802.11a, and according to the received WLAN physical layer packet 48 data of the second OFDM symbol after the L-SIG Whether the modulation symbol carried on the subcarrier is BPSK modulation to distinguish the physical layer packets of 802.11ac and 802.11n.
  • Figure 4 shows the physical layer packet structure of 802.11ax.
  • the initial part is also the traditional preamble, that is, the field consisting of L-STF, L-LTF and L-SIG, and finally the data field, the traditional preamble and the data field.
  • the preamble of the 802.11ax protocol is the HEW preamble.
  • the first field of the HEW preamble is the High Efficiency Signal-A field (HE-SIG-A).
  • the HE-SIG-A consists of At least one OFDM symbol having a length of 4 microseconds, between the L-SIG and the HE-SIG-A, the first OFDM symbol after the L-SIG is an OFDM symbol having a length of 4 microseconds, after the L-SIG
  • the second OFDM symbol is the first OFDM symbol of HE-SIG-A.
  • 802.11n or 802.11ac receivers should be avoided to misidentify 802.11ax physical layer packets as 802.11n or 802.11ac.
  • the physical layer is grouped.
  • the first and second OFDM symbols after the 802.11ax physical layer packet L-SIG are BPSK modulated, as shown in FIG.
  • two different solutions have been proposed in the prior art.
  • the length of the L-SIG is one OFDM symbol.
  • the first OFDM symbol after the L-SIG is the repetition of the L-SIG, that is, the first after the L-SIG.
  • the OFDM symbols are the same as the OFDM symbols of the L-SIG, and are called RL-SIG (English: Repeated L-SIG).
  • the 802.11ax receiver can correctly identify the physical layer packet of 802.11ax.
  • the RL-SIG is a repetition of the L-SIG, the receiver can transmit the data subcarriers of the two OFDM symbols.
  • the signals are combined to obtain a gain of 3dB signal to noise ratio (SNR), which improves the reliability of L-SIG transmission.
  • SNR signal to noise ratio
  • the first OFDM symbol after the L-SIG is a signature symbol (English: Signature Symbol), and an information bit carried by the OFDM symbol includes an 802.11ax signature sequence for identifying 802.11ax.
  • the probability that the non-802.11ax physical layer packet transmits the signature sequence in the first OFDM symbol after the L-SIG is 1/2 10 ⁇ 0.1%, and a longer (no more than 18 bits) signature sequence can be used.
  • the probability of misinterpreting the physical layer packet of the non-802.11ax as the physical layer packet of 802.11ax is further reduced.
  • the main problem of the first existing solution is that the 5 GHz band where the WLAN is located is an unlicensed spectrum, and other devices except the WLAN may use the frequency band, or the out-of-band leakage of other wireless devices may enter the frequency band, and these A lot of interference signals have periodicity.
  • the first existing scheme utilizes the repeated features of RL-SIG and L-SIG to be susceptible to periodic interference signals, thereby increasing the misjudgment of non-802.11ax physical layer packets to 802.11ax.
  • the first existing solution does not consider the support of the new version of the protocol after 802.11ax, that is, the new version of the protocol needs to redesign a new way to carry out the physical layer grouping of the new version of the protocol.
  • Automatic detection in contrast, the second existing solution only needs to assign a different signature sequence to 802.11ax for the new version of the protocol to distinguish between 802.11ax and the new version.
  • the second existing solution compared with the first existing solution, the second existing solution cannot obtain the SNR gain brought by the combination of L-SIG and RL-SIG, and cannot guarantee the reliable transmission of L-SIG at outdoor and low SNR.
  • Embodiment 1 of the present invention provides a data transmission method applied to a WLAN, and the method can be applied to a site, such as the AP and STA1-STA3 in FIG. 1, and the site can support a next-generation WLAN standard, for example, 802.11ax System.
  • Figure 6 is an interaction diagram of the data transmission method, and the specific steps are as follows:
  • Step 1 Generate a physical layer packet, where the physical layer packet includes a legacy signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the OFDM
  • the symbol includes a plurality of data subcarriers in a frequency domain, and the signal on the data subcarrier of the OFDM symbol is obtained by multiplying a signal on a data subcarrier corresponding to the position of the L-SIG by an element of a corresponding position of the feature sequence.
  • Step 2 Send a physical layer packet, and the first station sends the physical layer packet including the L-SIG and the OFDM symbol.
  • Step 3 Receive physical layer packets.
  • Step 4 Parsing the physical layer packet, specifically, including: respectively, the signal on the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet Each element is multiplied, and the signal obtained by multiplying is correlated with the signal on the L-SIG data subcarrier.
  • Step 5 Determine a protocol version of the physical layer packet, specifically, if the result of the cross-correlation processing exceeds the first threshold, the second station determines that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.
  • the cross-correlation processing in step 104 is a common method in signal processing, and is a signal processing method for determining the similarity between two signals.
  • the first threshold in step 105 is determined by a compromise between the false positive probability and the false negative probability. For example, if the cross correlation maximum is 1, the threshold may be taken as 0.95.
  • the present invention proposes a possible compliance with the next generation WLAN protocol (eg, The physical layer packet structure of 802.11ax) is shown in Figure 5.
  • the initial part is the traditional preamble, that is, the field consisting of L-STF, L-LTF, and L-SIG. After L-SIG is followed by L-SIG.
  • the first OFDM symbol which we call the scrambled RL-SIG field, is an OFDM symbol of length 4 microseconds with a CP of 0.8 microseconds.
  • the scrambled RL-SIG field adopts an embodiment of the present invention, and a protocol version-specific label is added, and the transmitted information bits are the same as the information bits transmitted by the L-SIG, and the modulation carried on the data subcarriers thereof
  • the symbols are BPSK modulated.
  • the scrambled RL-SIG field is followed by the next-generation WLAN protocol version-specific preamble, the foremost being a OFDM symbol having a length of 4 microseconds CP of 0.8 microseconds (ie, the second after the L-SIG) OFDM symbols), and the modulation symbols carried on the data subcarriers of the OFDM symbol are also BPSK modulated.
  • the next-generation WLAN protocol version-specific preamble is followed by a data field.
  • the process of the first station generating the first OFDM symbol (ie, the scrambled RL-SIG) after the L-SIG in the physical layer packet in step 101 is as shown in FIG. 7.
  • the signal on the L-SIG data subcarrier is a binary phase shift keyed BPSK modulation symbol, and the number of data subcarriers of the L-SIG and the OFDM symbol is 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence includes an 802.11ax protocol or a subsequent evolved protocol.
  • the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.
  • the process of generating the scrambled RL-SIG in the physical layer packet includes the following steps.
  • Step a The information bits of the L-SIG are first channel coded, typically using a convolutional coding rate of 1/2.
  • Step c-1 The generated K BPSK modulation symbols are directly formed into a time domain signal having a length of 3.2 microseconds by a 64-point inverse inverse Fourier transform (IFFT), and then 0.8 microseconds is added.
  • IFFT inverse inverse Fourier transform
  • the CP that is, generates an L-SIG field of length 4 microseconds.
  • Step c-2 L (L ⁇ K) of the generated K BPSK modulation symbols, respectively Multiplying with each element of a protocol version-specific feature sequence of length L, wherein each element of the feature sequence is +1 or -1, and then forming a time domain signal of 3.2 microseconds in length by 64-point IFFT After adding a CP of 0.8 microseconds, a scrambled RL-SIG field of length 4 microseconds is generated.
  • steps 104 and 105 the process of parsing the physical layer grouping and determining the protocol version of the physical layer grouping in the second station in steps 104 and 105 is as shown in FIG. 8. Specifically, the steps are as follows:
  • Step a After receiving the time domain signal of the first OFDM symbol after the L-SIG of the WLAN physical layer packet, the second station removes the CP and passes the 64-point fast Fourier transform (English: Fast Fourier transform, FFT for short) ) Transform to the frequency domain.
  • the 64-point fast Fourier transform English: Fast Fourier transform, FFT for short
  • Step b Multiplying each element of the 802.11ax specific feature sequence with the signal on the corresponding L data subcarriers.
  • Step c repeatedly detecting the signals on the K data subcarriers of the OFDM symbol and the signals on the K data subcarriers of the L-SIG, that is, determining the signals on the K data subcarriers of the OFDM symbol and the L- Whether the signals on the K data subcarriers of the SIG are the same, and if successful, it is determined that the physical layer packet is a physical layer packet of 802.11ax.
  • the repeated detection may be implemented by cross-correlation processing, that is, the signals on the K data subcarriers of the OFDM symbol are cross-correlated with the signals on the K data subcarriers of the L-SIG, if the result of the cross correlation processing exceeds The predetermined threshold, the second station determines that the physical layer packet is a physical layer packet of 802.11ax.
  • the signals on the K data subcarriers of the OFDM symbol are combined with the signals on the K data subcarriers of the L-SIG, and then BPSK demodulation and channel decoding are performed to obtain information bits of the L-SIG.
  • the first OFDM symbol after the L-SIG (ie, The modulation symbol carried on the data subcarrier of the scrambled RL-SIG) is still BPSK modulated, and the data of the second OFDM symbol after the L-SIG (ie the first OFDM symbol of the protocol version-specific preamble)
  • the modulation symbols carried on the carrier are also BPSK modulated, so that the 802.11n or 802.11ac receiver can be prevented from misjudge the physical layer packet as a physical layer packet of 802.11n or 802.11ac.
  • the first site functions as a transmitter
  • the second The site acts as a receiver
  • Both the first site and the second site may be access point APs or site STAs of the WLAN.
  • the signal on the data subcarrier of the first OFDM symbol after the L-SIG is determined by the signal on the data subcarrier corresponding to the position of the L-SIG and the corresponding position of the feature sequence.
  • the elements are multiplied, they are not repeated in the time domain or the frequency domain of the L-SIG, so that they are not subject to the misjudgment caused by the periodic interference signals.
  • the later version protocols of 802.11ax ie, subsequent version protocols
  • the feature sequence with which the 802.11ax specific feature sequence is cross-correlated can be adopted, and the automatic detection of the new version protocol can be implemented in the same manner, and the compatibility problem between different standards is solved. Therefore, the embodiment of the present invention ensures the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance.
  • FIG. 9 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to Embodiment 2 of the present invention.
  • the data transmission device is, for example, a site or a dedicated circuit or chip that implements related functions.
  • the data transmission device 1100 shown in FIG. 9 includes a processing unit 1101 and a transceiver unit 1102.
  • the channel indication device 1100 may be the AP or STA1-STA3 shown in FIG. 1.
  • the site in Embodiment 2 acts as a sender.
  • the processing unit 1101 is configured to generate a physical layer packet, where the physical layer packet includes a traditional signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and The OFDM symbol includes a plurality of data subcarriers in a frequency domain, and a signal on a data subcarrier of the OFDM symbol is caused by a signal on a data subcarrier corresponding to the position of the L-SIG and an element of a corresponding position of the feature sequence. Obtained after multiplication;
  • the transceiver unit 1102 is configured to send the physical layer packet including the L-SIG and the OFDM symbol.
  • the signal on the L-SIG data subcarrier in the physical layer packet generated by the processing unit is a binary phase shift keying BPSK modulation symbol.
  • the number of data subcarriers of the L-SIG and the OFDM symbol in the physical layer packet generated by the processing unit is 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1
  • the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
  • the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.
  • the processing unit multiplies the signal on the data subcarrier corresponding to the L-SIG corresponding position with the element of the corresponding position of the feature sequence to obtain the first OFDM symbol after the L-SIG.
  • the signal on the data subcarrier is not repeated in the time domain or the frequency domain of the L-SIG, so that it is not affected by the periodic interference signal and causes misjudgment.
  • the later version protocols of 802.11ax ie, subsequent version protocols
  • the feature sequence with which the 802.11ax specific feature sequence is cross-correlated can be adopted, and the automatic detection of the new version protocol can be implemented in the same manner, and the compatibility problem between different standards is solved. Therefore, the embodiment of the present invention ensures the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance.
  • FIG. 10 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to Embodiment 3 of the present invention.
  • the data transmission device is, for example, a site or a dedicated circuit or chip that implements related functions.
  • the data transmission device 1200 shown in FIG. 10 includes a processing unit 1201 and a transceiver unit 1202.
  • the channel indication device 1200 can be the AP or STA1-STA3 shown in FIG.
  • the station in Embodiment 3 acts as a receiver.
  • the transceiver unit 1201 is configured to receive a physical layer packet.
  • the processing unit 1202 is configured to parse the physical layer packet, and specifically includes: on a data subcarrier of a first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet The signals are multiplied one by one with each element of the feature sequence, and the multiplied signal is cross-correlated with the signal on the L-SIG data subcarrier;
  • the processing unit 1202 is configured to determine a protocol version of the physical layer packet, where the method includes: determining, if the result of the cross-correlation processing exceeds the first threshold, the physical layer grouping as a physical layer grouping of a protocol version corresponding to the feature sequence .
  • the number of data subcarriers of the L-SIG in the data packet parsed by the processing unit and the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG is 48 or 52.
  • the feature sequence is a sequence consisting of +1 and -1
  • the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
  • the length of the feature sequence is different from the number of data subcarriers of the L-SIG with.
  • the processing unit uses the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet received by the transceiver unit.
  • the upper signal is multiplied by each element of the feature sequence one by one, and the multiplied signal is cross-correlated with the signal on the L-SIG data subcarrier; if the cross correlation processing result exceeds the first threshold, the physical layer is determined Grouped into physical layer packets of the protocol version corresponding to the feature sequence. In the above manner, the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance are guaranteed.
  • a data transmission apparatus including a processor for generating or processing (transmitting or receiving) a new 11ax physical layer packet (as shown in FIG. 5).
  • the processor may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or may implement or perform the embodiments of the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. It is easy to understand that the processing device of the foregoing resource indication may be located at an access point when specifically transmitting the frame including the resource indication field, and may be located at the site when specifically receiving the frame including the resource indication field.
  • FIG. 11 is a block diagram of a transmitting station in accordance with another embodiment of the present invention.
  • the transmission point of FIG. 11 includes an interface 101, a processing unit 102, and a memory 103.
  • Processing unit 102 controls the operation of transmitting station 100.
  • Memory 103 can include read only memory and random access memory and provides instructions and data to processing unit 102.
  • a portion of the memory 103 may also include non-volatile line random access memory (NVRAM).
  • NVRAM non-volatile line random access memory
  • the various components of the transmitting site 100 are coupled together by a bus system 109, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as the bus system 109 in the figure.
  • the method for transmitting the foregoing various frames disclosed in the foregoing embodiments of the present invention may be applied to the processing unit 102 or implemented by the processing unit 102.
  • each step of the above method The completion may be accomplished by an integrated logic circuit of hardware in the processing unit 102 or an instruction in the form of software.
  • the processing unit 102 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, which can be implemented or executed in an embodiment of the invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 103, and the processing unit 102 reads the information in the memory 103 and completes the steps of the above method in combination with its hardware.
  • FIG. 12 is a block diagram of a receiving station in accordance with another embodiment of the present invention.
  • the receiving site of FIG. 12 includes an interface 111, a processing unit 112, and a memory 113.
  • Processing unit 112 controls the operation of receiving site 110.
  • Memory 113 can include read only memory and random access memory and provides instructions and data to processing unit 112.
  • a portion of the memory 113 may also include non-volatile line random access memory (NVRAM).
  • the various components of the receiving site 110 are coupled together by a bus system 119, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 119 in the figure.
  • the method for receiving the foregoing various frames disclosed in the foregoing embodiments of the present invention may be applied to the processing unit 112 or implemented by the processing unit 112.
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processing unit 112 or an instruction in a form of software.
  • the processing unit 112 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, which can be implemented or executed in an embodiment of the invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 113, and the processing unit 112 reads the information in the memory 113 in combination with the hard Complete the steps of the above method.
  • the memory 113 stores an instruction that causes the processing unit 112 to perform resource status information indicating a busy state of a sub-resource of a channel resource for which the access point performs data transmission with the station; sending to the access point Resource status information, so that the access point performs resource allocation according to resource status information.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • Any connection may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital STA line (DSL), or wireless technologies such as infrared, radio, and microwave
  • coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave
  • a disk and a disc include a pressure Compact discs (CDs), laser discs, compact discs, digital versatile discs (DVDs), floppy discs, and Blu-ray discs, where discs are usually magnetically replicated, while discs use lasers to optically replicate data. Combinations of the above should also be included within the scope of the computer readable media.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un procédé de transmission de données appliqué à un réseau local sans fil (WLAN). Le procédé consiste à : produire un paquet de couches physiques, le paquet de couches physiques comprenant un champ de signalisation traditionnel L-SIG et un premier symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) après le L-SIG, chacun des L-SIG et le symbole OFDM comprenant une pluralité de sous-porteuses de données dans un domaine de fréquence, des signaux sur les sous-porteuses de données du symbole OFDM étant obtenus par multiplication des signaux sur les sous-porteuses de données dans des positions correspondantes du L-SIG par des éléments dans des positions correspondantes d'une séquence de signature; et envoyer le paquet de couches physiques comprenant le L-SIG et le symbole OFDM. Les modes de réalisation de la présente invention concernent également un dispositif de transmission de données correspondant. L'application du procédé et du dispositif dans les modes de réalisation de la présente invention permet la reconnaissance d'un 11 ax paquet de couches physiques et l'amélioration de la performance de détection du L-SIG.
PCT/CN2015/075628 2015-03-31 2015-03-31 Procédé de transmission de données et dispositif de transmission Ceased WO2016154951A1 (fr)

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PCT/CN2015/075628 WO2016154951A1 (fr) 2015-03-31 2015-03-31 Procédé de transmission de données et dispositif de transmission

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