WO2016191991A1 - Procédé et dispositif de transmission d'unité de données de protocole de couche physique - Google Patents

Procédé et dispositif de transmission d'unité de données de protocole de couche physique Download PDF

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Publication number
WO2016191991A1
WO2016191991A1 PCT/CN2015/080440 CN2015080440W WO2016191991A1 WO 2016191991 A1 WO2016191991 A1 WO 2016191991A1 CN 2015080440 W CN2015080440 W CN 2015080440W WO 2016191991 A1 WO2016191991 A1 WO 2016191991A1
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length
threshold
ofdm symbol
indication information
field
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PCT/CN2015/080440
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English (en)
Chinese (zh)
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刘云
林梅露
李彦淳
刘乐
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华为技术有限公司
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Priority to PCT/CN2015/080440 priority Critical patent/WO2016191991A1/fr
Publication of WO2016191991A1 publication Critical patent/WO2016191991A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention belongs to the field of communications technologies, and in particular, to a method and apparatus for transmitting physical layer protocol data units.
  • WLAN Wireless Local Area Network, Chinese: WLAN
  • 4x symbol length is introduced in the next-generation WLAN standard 802.11ax, and the corresponding symbol of 802.11a/n/ac is 1x symbol.
  • the 4x symbol length means that the data length is 12.8us in one OFDM (Orthogonal Frequency Division Multiplexing) symbol.
  • 802.11ac there are 64 subcarriers on 20 MHz, corresponding to 64-point FFT; 128 subcarriers on 40 MHz, for 128-point FFT; 256 sub-carriers on 80 MHz, corresponding to 256-point FFT.
  • 802.11ax there are 256 subcarriers on 20MHz, corresponding to 256-point FFT; there are 512 subcarriers on 40MHz, for 512-point FFT; there are 1024 sub-carriers on 80MHz, corresponding to 1024-point FFT.
  • the 64 subcarriers of 802.11ac include 52 data subcarriers and 4 pilot subcarriers; 256 subcarriers of 802.11ax include 234 data subcarriers and 8 pilot subcarriers. If the same MCS (English: Modulation and Coding Scheme) is used, 802.11ax can transmit more than 4 times the amount of data compared to 802.11ac, because (234>4*52). For 40MHz and 80MHz, there are consistent results.
  • MCS Modulation and Coding Scheme
  • the processing time of the receiving end mainly includes: 1. FFT (English: Fast Fourier Transform, Chinese: Fast Fourier Transform); 2. De-mapping; 3. Channel decoding. The most time-consuming part of this is the channel decoding section. Since the amount of data in each OFDM symbol becomes larger, the channel decoding time becomes longer. This processing delay becomes severe in the case of a large bandwidth (80 MHz, etc.) and a high MCS (for example, MCS9, etc.).
  • SIFS Short Interframe Space
  • SIFS International: Short Interframe Space, Chinese: short frame interval.
  • SIFS duration of 16us is sufficient for the receiver to complete data processing and state switching.
  • 4x symbol that is, the frame of 802.11ax
  • the processing of the data may generate a relatively large delay. Therefore, in the case of the current SIFS duration of 16us, the receiving end cannot complete the switching of the data processing state.
  • the present invention provides a method and a device for transmitting a physical layer protocol data unit, so as to solve a relatively large delay in data processing at the receiving end, so that the receiving end cannot complete the switching of the data processing state in the current SIFS duration of 16 us. problem.
  • an embodiment of the present invention provides a method for transmitting a physical layer protocol data unit PPDU, which is applied to a wireless local area network, and includes: generating a physical layer protocol data unit PPDU, where the PPDU includes indication information, and the PPDU includes signal extension.
  • An SE field where the SE field is located after the last OFDM symbol carrying the useful information; wherein the indication information at least includes: indication information indicating whether the length of the SE field is greater than a threshold T threshold (I2) The threshold T threshold is not 0;
  • the threshold T threshold satisfies the condition that after the length of the SE field is added to the maximum value of the difference between the 4x OFDM symbol and the 1x OFDM symbol length, the result of subtracting the threshold T threshold should be less than one 4x.
  • the sum of the threshold T threshold plus the maximum of the difference between the 4x OFDM symbol and the 1x OFDM symbol length should be less than a 4x OFDM symbol length, the multi-OFDM symbol length including the length of the GI.
  • the threshold T threshold is 8 ⁇ s, other values between 12 ⁇ s or 8 ⁇ s-12 ⁇ s.
  • the indication information (I2) for indicating whether the length of the SE field is greater than the threshold T threshold occupies 1 bit.
  • the padding bit PHY Padding of the physical layer is included; the indication information further includes: indicating the physical layer The length of the bit PHY Padding is filled or the indication information (I1) of the position at which decoding should be stopped.
  • a padding bit PHY Padding of the physical layer is included; between the length of the PHY Padding and the length of the SE field There is a fixed correspondence.
  • the indication information further includes: 1 bit of indication information (I3) for indicating the PHY padding length or a position of the PPDU that should stop decoding.
  • an embodiment of the present invention further provides a processing method of a receiving end, including: receiving a physical layer protocol data unit PPDU, where the PPDU includes indication information, the PPDU includes a signal extension SE field, and the SE field After the last orthogonal frequency division multiplexing OFDM symbol carrying the useful information, where the indication information includes at least: indication information (I2) for indicating whether the length of the SE field is greater than a threshold T threshold ; the threshold T threshold Not 0; parse the PPDU, and obtain a position at which decoding should be stopped according to the indication information, and stop decoding at the position where the decoding should be stopped.
  • indication information includes at least: indication information (I2) for indicating whether the length of the SE field is greater than a threshold T threshold ; the threshold T threshold Not 0; parse the PPDU, and obtain a position at which decoding should be stopped according to the indication information, and stop decoding at the position where the decoding should be stopped.
  • the method further comprises: obtaining a length of the SE field.
  • the condition that the threshold T threshold satisfies and the value are as described above.
  • the obtaining, according to the indication information, the location that should be stopped for decoding includes: parsing an indication of the L-LENGTH included in the PPDU, obtaining a reception time RXTIME; according to the RXTIME and the Determining information (I2) indicating whether the length of the SE field is greater than a threshold T threshold , obtaining a total number M of OFDM symbols included in the PPDU; according to the length of the padding bit PHY Padding for indicating the physical layer or
  • the indication information (I1) of the position to be decoded should be stopped, and the position at which the decoding should be stopped in the Mth OFDM symbol is determined.
  • the process of obtaining a location at which decoding should be stopped according to the indication information and obtaining a length of the SE field includes: parsing an indication of obtaining an L-LENGTH included in the PPDU, and obtaining an indication Time RXTIME; according to the RXTIME and the indication information (I2) for indicating whether the length of the SE field is greater than the threshold T threshold , the total number M of OFDM symbols included in the PPDU is obtained; according to the RXTIME and the Said M, obtaining the length of the SE field; determining a position at which the decoding should be stopped in the Mth OFDM symbol according to a fixed correspondence between the length of the PHY Padding and the length of the SE field.
  • the process of obtaining a location at which decoding should be stopped according to the indication information and obtaining a length of the SE field includes: parsing an indication of obtaining an L-LENGTH included in the PPDU, and obtaining an indication Time RXTIME; according to the RXTIME and the indication information (I2) for indicating whether the length of the SE field is greater than the threshold T threshold , the total number M of OFDM symbols included in the PPDU is obtained; according to the RXTIME and the M, the length of the SE field is obtained; indication information (I3) indicating the position at which decoding should be stopped or the length of the PHY Padding is determined, and the position at which decoding should be stopped in the Mth OFDM symbol is determined.
  • an apparatus for implementing the above method is provided.
  • a transmission device of a physical layer protocol data unit characterized in that
  • a processing unit configured to generate a physical layer protocol data unit PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, where the SE field is located after a last orthogonal frequency division multiplexing OFDM symbol carrying the useful information;
  • the indication information at least includes: indication information (I2) for indicating whether the length of the SE field is greater than a threshold T threshold ; the threshold T threshold is not 0;
  • a sending unit configured to send the PPDU.
  • a receiving unit configured to receive a physical layer protocol data unit PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, where the SE field is located after a last orthogonal frequency division multiplexing OFDM symbol carrying the useful information;
  • the indication information at least includes: indication information (I2) for indicating whether the length of the SE field is greater than a threshold T threshold ; the threshold T threshold is not 0;
  • a processing unit configured to parse the PPDU, obtain a location that should stop decoding according to the indication information, and stop decoding at the location where the decoding should be stopped.
  • the length of the SE in the transmission process of the physical layer protocol data unit PPDU, can be indicated by using fewer bits.
  • the receiving end can ensure that the receiving end can quickly complete data processing and state switching, and further less related information overhead.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 2 is a structural diagram of a physical layer protocol data unit according to an embodiment of the present invention.
  • FIG. 3 is a partial block diagram of a possible embodiment PPDU.
  • FIG. 4 is a partial block diagram of a possible embodiment PPDU.
  • Figure 5 is a partial block diagram of a possible embodiment PPDU.
  • FIG. 6 is a schematic diagram of a decoding stop position in a preferred embodiment PPDU.
  • FIG. 7 is a schematic diagram of indication information of an SE of a preferred embodiment PPDU.
  • FIG. 8 is a schematic diagram of a decoding stop position of a preferred embodiment PPDU.
  • FIG. 9 is a schematic diagram of a decoding stop position of a preferred embodiment PPDU.
  • Figure 10 is a simplified schematic diagram of an access point.
  • Figure 11 is a simplified schematic diagram of a site.
  • the embodiment of the present invention can be applied to a WLAN.
  • the WLAN may include a plurality of Basic Service Sets (BSSs), the nodes of the basic service set are site STAs, and the sites include access point class (Access Point, AP for short) and non-access point class sites ( None Access Point Station (Non-AP STA), each basic service set may include one AP and multiple Non-AP STAs associated with the AP.
  • BSSs Basic Service Sets
  • AP Access Point
  • Non-AP STA None Access Point Station
  • 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 various wireless network clients together. Then connect the wireless network to the wired network.
  • the AP may be a terminal device or a network device with a Wireless Fidelity (WiFi) 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.
  • the above 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.
  • the AP can perform uplink and downlink transmissions to different STAs on different time-frequency resources.
  • the AP can adopt different modes for uplink and downlink transmission, such as OFDMA single-user multiple-input multiple-output (SU-MIMO) mode, or OFDMA multi-user multiple input multiple output (Multi-User Multiple).
  • SU-MIMO OFDMA single-user multiple-input multiple-output
  • Multi-User Multiple OFDMA multi-user multiple input multiple output
  • MU-MIMO -Input Multiple-Output
  • FIG. 1 is an application scenario diagram of an embodiment of the present invention.
  • the AP 20 includes a host processor 15 that is coupled to the network interface 16.
  • the network interface 16 includes a medium access control (MAC) unit 17 and a physical layer (PHY) unit 18.
  • the physical layer (PHY) unit 18 includes a plurality of transceivers 19, and the transceiver 19 is coupled to a plurality of antenna pairs.
  • MAC medium access control
  • PHY physical layer
  • AP 14 may include different numbers (eg, 1, 2, 4, 5, etc.) of transceivers 19 and antenna pairs in other embodiments.
  • Site 30-1 includes a host processor 25 coupled to network interface 26.
  • Network interface 26 includes a MAC unit 27 and a PHY unit 28.
  • PHY unit 28 includes a plurality of transceivers 29, and the transceiver 29 is coupled to multiple antennas.
  • client station 30-1 may include different numbers (eg, 1, 2, 4, 5, etc.) of transceivers in other embodiments. antenna.
  • one or more of stations 30-2, 30-3, and 30-4 have the same or similar structure as client site 30-1, but may have the same or a different number of transceivers and antennas .
  • legacy station 30-4 has only one transceiver and one antenna.
  • FIG. 2 is a structural diagram of a Physical Layer Protocol Data Unit (PPDU) according to the embodiment.
  • PPDU Physical Layer Protocol Data Unit
  • This data unit occupies an 80 MHz bandwidth.
  • data unit 100 can occupy different bandwidths, such as 20 MHz, 40 MHz, 120 MHz, 160 MHz, or any suitable bandwidth.
  • Data unit 100 is suitable for "mixed mode" scenarios, such as when WLAN 10 includes a site (e.g., legacy site 30-4) that conforms to legacy protocols and does not conform to the 802.11ax protocol. Data unit 100 can also be used in other applications.
  • the data unit of FIG. 2 is a possible 802.11ax data unit, and is compatible with the existing WLAN system.
  • the head of the 802.11ax data frame is a Legacy Preamble field.
  • L-STF English: Legacy Short Training Field, Chinese: Traditional Short Training Field
  • L-LTF English: Legacy Long Training Field, Chinese: Traditional Length Training Field
  • L-SIG English: Legacy Signaling Field, Chinese
  • the Legacy Preamble field is followed by RL-SIG (English: Repeated Legacy Signaling Field), Efficient Signaling Field A (English: High Efficiency Signal Field A, referred to as HE-SIGA) and other efficient preamble fields.
  • HE-SIGA High Efficiency Signal Field A
  • the Other HE Preamble refers to a field or a combination of multiple fields, and is not limited to a specific field.
  • the Other Hew Preamble field is followed by a data field (Data).
  • Data data field
  • the name of the system or the name of the field, etc. may be replaced by any other name, and should not be considered as limiting the scope of the present invention, and the description of the data frame also applies to Subsequent embodiments.
  • 802.11ax considers the scenario of outdoor transmission.
  • the channel delay is large due to the influence of multipath, and the CP (Cyclic Prefix) has to choose a longer length to ensure the quality of the transmission.
  • the Data portion contains a plurality of OFDM symbols.
  • the length of one OFDM symbol is 4/3.6 ⁇ s, where the data length is 3.2 ⁇ s and the CP length is 0.8/0.4 ⁇ s.
  • the length of the CP needs to be 1.6/3.2 ⁇ s. If the data portion remains 3.2 ⁇ s, then in an OFDM symbol, CP will account for 33% (1.6 ⁇ s cp + 3.2 ⁇ s data) or 50% (3.2 ⁇ s cp + 3.2 ⁇ s data). Therefore, in order to improve the efficiency of transmission, a 4x symbol length is introduced in 802.11ax, and the corresponding symbol of 802.11a/n/ac is 1x symbol.
  • the so-called 4x symbol length means that in one OFDM symbol, the data length is 12.8 ⁇ s.
  • 802.11ac there are 64 subcarriers on 20M, corresponding to 64-point FFT; there are 128 subcarriers on 40M, corresponding to 128-point FFT; there are 256 sub-carriers on 80M, corresponding to 256-point FFT.
  • 802.11ax there are 256 subcarriers on 20M, corresponding to 256-point FFT; there are 512 subcarriers on 40M, for 512-point FFT; there are 1024 sub-carriers on 80M, corresponding to 1024-point FFT.
  • the 64 subcarriers of 802.11ac include 52 data subcarriers and 4 pilot subcarriers; 256 subcarriers of 802.11ax include 234 data subcarriers and 8 pilot subcarriers. If the same MCS is used, 802.11ax can transmit more than 4 times the amount of data compared to 802.11ac, because (234>4*52). For the 40M and 80M cases, there is consistent results.
  • the Data portion of 802.11ax contains more than 4 times the amount of data per OFDM symbol. Therefore, for the receiving end, processing each The time of OFDM symbols becomes longer.
  • the processing at the receiving end mainly includes: 1. FFT; 2. demapping; 3. channel decoding. The most time-consuming part of this is the channel decoding section. Since the amount of data in each OFDM symbol becomes larger, the channel decoding time becomes longer. This processing delay is more serious in large bandwidth (80M, etc.), high MSC (MSC9, etc.), and LDPC encoding.
  • SIFS 16 ⁇ s and then reply
  • a 16 ⁇ s SIFS duration is sufficient for the receiver to complete data processing and state switching.
  • 4x symbols ie, 802.11ax frames
  • the processing of data may result in relatively large delays, as described in the previous paragraph. Therefore, the SIFS duration of 16 ⁇ s may not be able to complete the data processing and state switching at the receiving end in some cases.
  • embodiments of the present invention focus on solving the problem that the SIFS time may not be sufficient for the receiving end to complete data processing and state switching.
  • embodiments of the present invention are clear, several possible embodiments will be introduced first, and several preferred embodiments will be highlighted.
  • a frame extension (FE, frame extension) is added, so that the receiver provides some additional time for receiving data. deal with. It can also be seen that in the last OFDM symbol, part of it is padding bit, and English is padding. This part of padding is the padding of the physical layer, that is, does not participate in the compilation code. Therefore, the receiving end can not decode this part, saving the time required to process the data. In order to let the receiving end know where the decoding should be stopped, a possible implementation 1 also proposes to indicate the user's payload length in the HE-SIGB.
  • the length of the Frame extension is a function of the current transmission bandwidth, MCS, stream number, padding duration, and receiving end processing capability.
  • the originator first calculates the processing time required for a receiving end based on the current transmitted bandwidth, MCS, stream number and processing capability at the receiving end, and records it as x ⁇ s. Then according to use The amount of data of the user, and the duration of padding in the last OFDM symbol is calculated and recorded as y ⁇ s. Finally, a value of not less than x-y is selected from [0, 4, 8, 12, 16] ⁇ s as the length of the Frame extension, and the waveform of the Frame extension is not limited. The starting point for SIFS will be after the Frame extension.
  • the originator calculates a frame extension for each user, selects the longest frame extension to be placed after the last OFDM symbol, and has a payload length for each user in the HE-SIGB. Instructions.
  • the possible implementation manner 2 also proposes adding a signal extension (SE, signal extension, that is, a frame extension of a possible implementation manner) after the last OFDM symbol, in order to provide some information to the receiving end. Additional time is spent on receiving data. It can be seen that in the last OFDM symbol, a part of the padding bits, that is, padding, is also included.
  • the possible implementation 2 is called post-FEC padding, and the essence is the padding of the physical layer, and does not participate in the coding.
  • the pre-FEC padding in the second implementation manner is different from the post-FEC padding.
  • the pre-FEC padding needs to participate in the coding and decoding, and the receiving end needs to process a part of the padding like the information bits.
  • the originator also needs to tell the receiver that it should stop decoding.
  • the possible implementation manner 2 does not let the receiving end know the position where the decoding should be stopped by indicating the load length, but divides the last OFDM symbol into several segments, in the HE-SIG. Indicates the ratio of Excess info bit and pre-FEC padding bit to the last OFDM symbol. For example, 00 indicates 1/4, 01 indicates 1/2, 10 indicates 3/4, and 11 indicates 1. After the receiving end reads the indication, the decoding is stopped at the corresponding segment.
  • the length of the Signal extension has a one-to-one mapping relationship with the ratio of the Excess info bit and the pre-FEC padding bit, that is, the specific position at which the decoding should be stopped corresponds to the specific Signal Extension length.
  • the Signal extension length can also be obtained by the aforementioned indication.
  • the overhead indicated in the HE-SIG is still relatively large, at least 2 bits; in addition, the length of the signal extension does not change with different transmission scenarios (such as BW, MCS, number of streams), which may cause over-protection. For example, if the ratio of Excess info bit and pre-FEC padding bit is 3/4, it does not mean that you need to add a signal extension, because the current transmission may use a very low MCS, or a small number of streams.
  • the traditional SIFS time is enough for the receiver to complete data processing and state switching.
  • the possible implementation manner is the same as the possible implementations one and two.
  • a frame extension is added (signal extension, which is recorded as a frame in FIG. 5).
  • the purpose is to provide the receiver with some extra time for receiving data processing.
  • this part of the signal extension is optional and can be set to 0 if needed.
  • the possible implementation manner 3 also proposes that in the last OFDM symbol, a part of padding bits, that is, padding, padding of the physical layer, which is recorded as PHY Padding, is not involved in the coding code.
  • the possible implementation three uses two bits to indicate PHY Padding
  • the length for example, 00 indicates that there is no PHY padding, 01 indicates that the PHY padding length accounts for 1/4 of the length of the last OFDM symbol, 10 indicates that the PHY padding length accounts for 1/2 of the last OFDM symbol, and 11 indicates that the PHY padding length occupies the last.
  • One OFDM symbol is 3/4 in length.
  • the possible implementation three uses three bits to indicate the following lengths of the Frame Extension (ie, Signal Extension in the second embodiment) ⁇ 0, 4 ⁇ s, 8 ⁇ s, 12 ⁇ s, 16 ⁇ s ⁇ . With five bits indicating PHY padding and Frame Extension, a possible implementation three can support flexible indication of the respective lengths of PHY padding and Frame Extension.
  • a possible implementation of the fourth embodiment is similar to the possible implementation of the second embodiment, in that two bits are used to indicate the position at which the decoding should be stopped at the segment on the last OFDM symbol.
  • a signal extension is added to provide the receiver with some extra time for receiving data.
  • this part of the signal extension is optional and can be set to zero if needed.
  • a single bit is used at the transmitting end to indicate avoidance of such possible ambiguity.
  • the processing at the transmitting end is relatively complicated, not only to identify the location where decoding should be stopped, but also to calculate whether the current transmission time will cause more OFDM symbols to be solved at the receiving end.
  • the OFDM symbols of each user are not aligned, and the user can also know the respective decoding end positions.
  • the receiving end can correctly locate the position of the last OFDM symbol carrying the useful data.
  • the padding bits of the physical layer may be included, and the English is PHY Padding.
  • the receiver is provided with some extra time for receiving data processing.
  • the PHY Padding (or Post-FEC Padding) and the SE (or FE) are flexibly matched, that is, there is no fixed relationship.
  • the sending or receiving is performed.
  • the PPDU includes: indication information I1 indicating the position at which decoding should be stopped or the length of the PHY Padding, and indication information I2 indicating whether the length of the SE field is greater than a specific threshold.
  • Step 101 Generate a PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, where the SE field is located after a last orthogonal frequency division multiplexing OFDM symbol carrying useful information, the indication information is used to indicate Information about the SE field.
  • whether the current PPDU includes the SE may be determined by a BW, an MCS, a stream number, or an encoding mode indication in the current HE-SIG.
  • the indication information includes: a stop decoding location or a PHY of the PPDU An indication of the padding length, which can be implemented with only 2 bits; denoted as indication information I1.
  • the indication information further includes an indication indicating whether the length of the SE field is greater than a certain non-zero specific threshold, the indication may occupy 1 bit; and is indicated as the indication information I2.
  • the position at which decoding should be stopped is the starting position of the PHY padding, so the above indication information I1 can indicate both the position at which decoding should be stopped and the PHY padding length.
  • the indication information I1 is 2 bits in length, it may indicate four possible positions to stop decoding: 1/4 OFDM symbol length, 1/2 OFDM symbol length, 3/4 OFDM symbol length, or 1 OFDM symbol length, as shown in the figure. 6 is shown.
  • the PHY padding length is 3/4 OFDM symbol length, 1/2 OFDM symbol length, 1/4 OFDM symbol length, or 0, respectively.
  • FIG. 6 a simple schematic diagram of the last OFDM symbol carrying useful information in a PPDU, in which the four possible locations of the above-described stop decoding are simply shown.
  • the post-FEC padding shown in FIG. 6 is PHY padding, and the extra info bits and pre-FEC padding before the PHY padding are the parts that need to be decoded.
  • the threshold T threshold can be set to other values between 8 ⁇ s, 12 ⁇ s, or 8 ⁇ s-12 ⁇ s; if the current PPDU requires the SE field If the length of the SE field is greater than T threshold , the setting indication information I2 is the first value; if the length of the SE field required by the current PPDU is less than or equal to T threshold , the setting indication information I2 is the second value.
  • the threshold T threshold can be set to other values between 8 ⁇ s, 12 ⁇ s or 8 ⁇ s-12 ⁇ s; if the current PPDU requires the SE field If the length of the SE field is greater than or equal to T threshold , the setting indication information I2 is the first value; if the length of the SE field required by the current PPDU is less than T threshold , the setting indication information I2 is the second value.
  • the first value of the indication information I2 may be 1 and the second value may be 0. Or conversely, the first value may take a value of 0, and the second value may take a value of 1.
  • FIG. 7 a simple schematic diagram of the values of the corresponding indication information I2 under the lengths of several SEs.
  • Step 102 Send the generated PPDU.
  • Step 200 Receive a PPDU, where the PPDU includes indication information I1 for indicating a stop decoding position or a PHY padding length of the PPDU, and indication information I2 indicating whether the length of the SE field is greater than a certain threshold T threshold .
  • Step 202 Parse the PPDU to obtain the number M of OFDM symbols transmitted by the PPDU.
  • the process in which the receiving end obtains the number M of OFDM symbols transmitted by the PPDU may include:
  • Step 2021 Obtain a reception time RXTIME according to the indication of L-LENGTH included in the parsed PPDU.
  • RXTIME can be calculated by the following formula.
  • L_LENGTH is the symbol length of the PPDU in the case of 1x OFDM
  • RXTIME is the reception time; m is the remainder of L-LENGTH modulo 3.
  • Step 2022 Obtain the number M of OFDM symbols included in the PPDU according to the RXTIME and the indication information (I2).
  • the value of the indication information I2 is 1.
  • the length of the SE is greater than (or greater than or equal to) the threshold T threshold
  • the indication information I2 is 0, where:
  • b SE is the indication information I2.
  • the T threshold is the threshold value described in step 200.
  • T L_PREAMBLE refers to the transmission time of the L-preamble.
  • T HE_PREAMBLE refers to the transmission time of the HE-preamble.
  • T GI refers to the length of the cyclic prefix.
  • T OFDM refers to the symbol duration of 4x OFDM, which is 12.8 ⁇ s.
  • the value of the indication information I2 is 0, and when the length of the SE is less than or equal to (or less than) the threshold T threshold , when the indication information I2 is 1, wherein:
  • the T threshold can be, but is not limited to, any value between 8 ⁇ s and 12 ⁇ s.
  • Step 203 Determine, by the indication information I1 included in the parsed PPDU, a position at which decoding should be stopped in the Mth OFDM symbol.
  • Step 204 Obtain the length of the SE field.
  • the following formula can be used:
  • T SE is the length of the SE time and T GI refers to the length of the cyclic prefix.
  • only the 3 bits are used to indicate the related information of the SE field, which saves 2 bits compared with the foregoing possible implementation 3, and can also flexibly indicate PHY Padding (or Post). -FEC Padding) matches the SE.
  • a physical layer padding bit PHY Padding may be included.
  • a frame Extension signal extension, or signal extension, FE, or SE
  • FE signal extension
  • the transmitted or received PPDU includes indication information I2 for indicating whether the length of the SE field is greater than a specific threshold T threshold of non-zero, and does not need to include indication information I1 for indicating the position of the PHY Padding.
  • Step 301 Generate a PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, and the SE field is located after the last orthogonal frequency division multiplexing OFDM symbol carrying the useful information, where the indication information is used to indicate Information about the SE field.
  • whether the current PPDU includes the SE may be determined by a BW, an MCS, a stream number, or an encoding mode indication in the current HE-SIG. Specifically, when the BW is increased, the high-order MCS, and the number of streams are large, the case where the SE is included may occur.
  • the indication information is specifically indication information I2 for indicating whether the length of the SE field is greater than a certain threshold.
  • the length of the indication information I2 may be only 1 bit.
  • the threshold T threshold can be set to other values between 8 ⁇ s, 12 ⁇ s, or 8 ⁇ s-12 ⁇ s; if the current PPDU requires SE If the length of the field is greater than 8 ⁇ s, the indication information is set to a first value; if the length of the SE field required by the current PPDU is less than or equal to 8 ⁇ s, the indication information is set to a second value.
  • the threshold T threshold can be set to other values between 8 ⁇ s, 12 ⁇ s or 8 ⁇ s-12 ⁇ s; if the current PPDU requires the SE field If the length of the SE field is greater than or equal to T threshold , the length of the SE field is less than T threshold .
  • the first value may be 1 and the second value may be 0.
  • the first value may take a value of 0, and the second value may take a value of 1.
  • Step 302 Send the generated PPDU.
  • the method comprises:
  • Step 400 Receive a PPDU, where the PPDU includes at least indication information I2 for indicating whether the length of the SE field is greater than a certain threshold.
  • Step 402 Parse the PPDU to obtain the number M of OFDM symbols transmitted by the PPDU.
  • the process in which the receiving end obtains the number M of OFDM symbols transmitted by the PPDU may include:
  • Step 4021 Obtain a reception time RXTIME according to an indication of the L-LENGTH included in the parsing PPDU.
  • L_LENGTH is the symbol length of the PPDU in the case of 1x OFDM; RXTIME is the reception time; m is the remainder of the L-LENGTH modulo 3.
  • Step 4022 Calculate the number M of OFDM symbols according to RXTIME.
  • the indication information I2 is 1 and is less than or equal to (or less than) the threshold T threshold , when the indication information I2 is 0, (Formula 2-3)
  • b SE is the indication information for whether the SE is greater than a certain threshold.
  • the T threshold is the threshold value described in step 400.
  • T L_PREAMBLE refers to the transmission duration of the L-preamble.
  • T HE_PREAMBLE refers to the transmission duration of the HE-preamble.
  • T GI refers to the length of the cyclic prefix.
  • T OFDM is the symbol duration of 4x OFDM and can be taken as 12.8 ⁇ s.
  • the indication information I2 when the length of the SE is greater than (or greater than or equal to) the threshold T threshold , the indication information I2 is 0, and when the threshold information is less than or equal to (or less than) the threshold T threshold , when the indication information I2 is 1, the
  • the T threshold can be, but is not limited to, any value between 8 ⁇ s and 12 ⁇ s.
  • Step 403 Calculate the length of the SE field. It can be calculated using the following formula:
  • the T SE is the length of the SE time, and other parameters are the same as in the previous formula, and are not described here.
  • Step 404 Obtain the length of the PHY Padding according to the length of the SE field by a fixed relationship between the PHY Padding and the SE, thereby determining a position where the decoding should be stopped in the Mth OFDM symbol.
  • the fixed relationship between the foregoing special PHY Padding (or Post-FEC Padding) and the SE (or FE) may be specified by the protocol, and may be specifically, but not limited to, the foregoing description in the second possible embodiment. . It can be known by those skilled in the art that in the preferred embodiment, one bit of indication information is saved than the foregoing possible implementation.
  • the padding bit PHY Padding of the physical layer may be included.
  • the receiver is provided with some extra time for receiving data processing.
  • the total length of the PHY Padding (or Post-FEC Padding) and the SE (or FE) is greater than a certain threshold value TSUM.
  • the PPDU is sent or received.
  • the indication information I3 indicating the position at which the decoding should be stopped or the length of the PHY Padding, and the indication information I2 indicating whether the length of the SE field is greater than a specific threshold is included.
  • Step 501 Generate a PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, where the SE field is located after a last orthogonal frequency division multiplexing OFDM symbol carrying useful information, the indication information is used to indicate Information about the SE field.
  • whether the current PPDU includes the SE may be determined by a BW, an MCS, a stream number, or an encoding mode indication in the current HE-SIG. Specifically, when the BW is increased, the high-order MCS, and the number of streams are large, the case where the SE is included may occur.
  • the indication information includes indication information I3, which is used to indicate a stop decoding position or a PHY padding length of the PPDU, including but not limited to: the PHY padding length is an odd multiple of a quarter length of the 4x OFDM symbol length. Length, or even multiple length, or, the length of the current SE field, the maximum available length of the PHY padding length and the second maximum available length.
  • the length of the indication information I3 may be 1 bit.
  • the four possible positions to stop decoding are 1/4, 1/2, 3/4, 1.
  • the possible position to stop decoding at this time is only 1/4, 1/2;
  • the information I1 may be specifically as follows: the first value indicates that the position at which decoding should be stopped is 1/4, and the second value indicates that the position at which decoding should be stopped is 1/2.
  • the first value indicates that the position at which decoding should be stopped is 1/2
  • the second value indicates that the position at which decoding should be stopped is 1/4.
  • the position indicating that the decoding should be stopped is 1/4, and when the indication information I3 is the second value, indicating that there is no PHY Padding; or vice versa, when When the indication information I3 is the first value, it means that there is no PHY Padding, and when the indication information I3 is the second value, the position indicating that the decoding should be stopped is 1/4.
  • the preferred embodiment 3 may follow the above table to indicate the indication information I3, wherein the second column and the third column of each row in the above table may be exchanged, or other forms of modification may be performed.
  • Various tables after the modification are also applicable to this embodiment.
  • the indication information in the indication information further includes an indication indicating whether the length of the SE field is greater than a certain threshold, and is indicated as the indication information I2; the indication may be implemented by using only one bit.
  • the threshold T threshold can be set to other values between 8 ⁇ s, 12 ⁇ s, or 8 ⁇ s-12 ⁇ s; if the current PPDU requires SE If the length of the field is greater than the T threshold , the setting indication information I2 is the first value; if the length of the SE field required by the current PPDU is less than or equal to the T threshold , the setting indication information I2 is the second value;
  • the threshold T threshold can be set to other values between 8 ⁇ s, 12 ⁇ s or 8 ⁇ s-12 ⁇ s; if the current PPDU requires the SE field a length greater than equal to T threshold, the setting information I2 indicating a first value; PPDU if desired length of the current field is less than SE T threshold, the setting information I2 indicating a second value;
  • the first value may be 1 and the second value may be 0.
  • the first value may take a value of 0, and the second value may take a value of 1.
  • Step 502 Send the generated PPDU.
  • Step 600 Receive a PPDU, where the PPDU includes indication information I3 indicating a location at which decoding should be stopped or a length of PHY Padding, and indication information I2 indicating whether the length of the SE field is greater than a specific threshold T threshold .
  • Step 602 Parse the PPDU to obtain the number M of OFDM symbols transmitted by the PPDU.
  • the process in which the receiving end obtains the number M of OFDM symbols transmitted by the PPDU may include:
  • Step 6021 Obtain a reception time RXTIME according to an indication that the L-LENGTH is included in the parsing PPDU.
  • RXTIME can be calculated using the following formula. (Equation 3-1)
  • L_LENGTH is the symbol length of the PPDU in the case of 1x OFDM.
  • RXTIME is the receiving time.
  • m is the remainder of L-LENGTH mode 3.
  • Step 6022 Calculate the number M of OFDM symbols according to RXTIME.
  • the indication information I2 is 1 and is less than or equal to (or less than) the threshold T threshold , when the indication information I2 is 0:
  • b SE is the indication information I2.
  • T threshold is the threshold value described in step 3.
  • T L_PREAMBLE refers to the transmission duration of the L-preamble.
  • T HE_PREAMBLE refers to the transmission duration of the HE-preamble.
  • T GI refers to the length of the cyclic prefix.
  • T OFDM is the symbol duration of 4x OFDM and can be taken as 12.8 ⁇ s.
  • the indication information I2 when the length of the SE is greater than (or greater than or equal to) the threshold T threshold , the indication information I2 is 0, and when the threshold I is less than or equal to (the threshold value T threshold ), the indication information I2 is 1:
  • the T threshold can be, but is not limited to, any value between 8 ⁇ s and 12 ⁇ s.
  • Step 603 Calculate the length of the SE field according to the RXTIME and the M. The formula is as follows
  • the T SE is the length of the SE time, and other parameters are the same as in the previous formula, and are not described here.
  • Step 604 Determine, by the indication information I3 and the length of the previously calculated SE field, the position at which the decoding should be stopped in the Mth OFDM symbol.
  • the foregoing Table 1 (or an alternative scheme thereof) may be queried to obtain a PHY Padding length, or a position at which decoding should be stopped.
  • two bits can be used to indicate a position at which decoding should be stopped or PHY padding.
  • the length, as well as the length of the SE (specifically, one bit indicating the length of the PHY padding and another bit indicating the SE), saves 1 bit compared to the aforementioned possible implementation.
  • the indication information may be located in the high-efficiency signaling field HE-SIG, or the L-SIG, and the embodiments do not limit this.
  • the generated and transmitted PPDU contains indication information
  • the PPDU includes a signal extension SE field
  • the SE field is located at the last orthogonal frequency carrying the useful information.
  • the indication information includes at least: indication information (I2) for indicating whether the length of the SE field is greater than a threshold T threshold ; the threshold T threshold is not 0.
  • the length of the 4x OFDM symbol is currently simulated using a 1x OFDM symbol length. Since the 4x OFDM symbol length is not necessarily an integer multiple of 1x OFDM, when calculating the 4x OFDM symbol length using 1x OFDM, it is possible to calculate an error length of less than 1x OFDM.
  • the above threshold T threshold may be specified by the system or an associated communication protocol, but the selection range of the threshold T threshold shall comply with the following requirements:
  • the result of subtracting the threshold T threshold should be less than a 4x OFDM symbol length (including the length of the GI). From this requirement, the lower limit of the threshold T threshold can be obtained.
  • the sum of the threshold T threshold plus the maximum of the difference between the 4x OFDM symbol and the 1x OFDM symbol length should be less than a 4x OFDM symbol length (including the length of the GI). From this requirement, the upper limit of the threshold T threshold can be obtained.
  • the range of the T threshold when the value of the indication information is determined according to whether the length of the SE is greater than or equal to the T threshold ; the range of the T threshold :
  • SE max is the maximum value that the SE length can take.
  • T GI refers to the length of the cyclic prefix.
  • T OFDM is the symbol duration of 4x OFDM and can be taken as 12.8 ⁇ s.
  • RE max is the maximum of the differences that may occur when calculating the length using 1x OFDM symbols when transmitting using 4x OFDM symbols.
  • the value of the length of the SE field may be a discrete value
  • a minimum value that satisfies the following two conditions is taken as the SE i in all the lengths of the SE.
  • RE min is the minimum of the differences that may occur when the length is calculated using 1x OFDM symbols when transmitting using 4x OFDM symbols, and other parameters are the same as those in the aforementioned formula.
  • T OFDM is 12.8 ⁇ s and T GI is 0.8 ⁇ s
  • the T threshold range when a value determined according to information indicating whether the length is greater than or equal SE T threshold, the T threshold range:
  • T GI is 3.2 ⁇ s, T threshold ⁇ (0, 16 ⁇ s); T GI is 1.6 ⁇ s, T threshold ⁇ (4.8 ⁇ s, max ⁇ 11.6 ⁇ s, SE i ⁇ ); T GI is 0.8 ⁇ s, T threshold ⁇ (5.6 ⁇ s, max ⁇ 10.4 ⁇ s, SE i ⁇ ]; when it is judged that the length of SE is greater than T threshold , when the indication information I2 is set to the first value, T GI is 3.2 ⁇ s, T threshold ⁇ (0, 16 ⁇ s); T GI is 1.6 ⁇ s, T threshold ⁇ (4.8 ⁇ s, max ⁇ 11.6 ⁇ s, SE i ⁇ ); T GI is 0.8 ⁇ s, T threshold ⁇ (5.6 ⁇ s, max ⁇ 10.4 ⁇ s, SE i ⁇ ).
  • Example 2 when a value determined in accordance with information indicating whether the length of the SE is greater than T threshold, the T threshold range:
  • T OFDM can be a possible multi-fold OFDM symbol in the future, such as 6x OFDM symbols, 8x OFDM symbols, and the calculation method is the same, no longer here. Narration.
  • the above multi-user transmission refers to transmission with multiple users (sites) at the same time, for example, using OFDMA technology, or multi-user MIMO technology.
  • whether the current PPDU includes the SE may be determined by a BW, an MCS, a stream number, or an encoding mode indication in the current HE-SIG. Specifically, when the BW is increased, the high-order MCS, and the number of streams are large, the case where the SE is included may occur.
  • the multi-user transmission mode it can be used for each user's respective BW, MCS, and flow.
  • the number or coding mode determines whether PHY padding needs to be included in the last OFDM symbol carrying the useful information of the user, or one or a combination of SEs is included after the last OFDM symbol.
  • all users can use MAC Padding or Pre-FEC padding to make all users stop decoding locations or PHY padding lengths the same.
  • the stop decoding locations or PHY padding lengths of different users may be different.
  • the length of the SE on each frequency band should be adjusted to be the same; for the multi-user MIMO transmission mode, the longest-length SE determined according to the situation of each user may be included in the frequency band of the multi-user MIMO transmission. .
  • a method for processing a PPDU includes:
  • Step 701 It may be determined whether information about the BW, the MCS, the number of streams, or the coding mode of each user is required to include the SE after transmitting the last OFDM symbol of the user.
  • Step 702 Generate a PPDU to be sent to the first group of users and a second group of users, where the PPDU includes indication information, the PPDU includes a signal extension SE field, and the SE field is located with After the last orthogonal frequency division multiplexing OFDM symbol of the information, the indication information is used to indicate related information of the SE field.
  • FIG. 8 a simplified schematic diagram of the decoding stop position and the SE field in a specific example.
  • the stop decoding position of the user with the shortest PHY padding in the first group of users is used as the stop decoding position of all users in the first group (ie, FIG. 8 Medium aligned decoding end position).
  • the SE length of each user may be generated, and the length of the generated longest SE field is used as the length of the SE field of the first group of users.
  • MAC padding (or Pre-FEC padding) may be employed, so that the stop decoding positions of the second group of users are all at the end of the last OFDM symbol. It is also possible not to align the position of the second group of users that should stop decoding.
  • the stop decoding location of the LDPC-encoded user in the second group of users may be the end of the last OFDM symbol.
  • the length of the SE is the same as the first group of users; if there is no first group of users, the SE is 0.
  • the length of the SE field included in the indication information in step 702 is also applied to the second group of users, but the stop decoding position included in the indication information in step 702 does not need to be applied to the second group of users. .
  • the indication information in the step 702 is generated according to the foregoing determined stop decoding location for the first group of users and the length of the SE field, and the specific form of the indication information may be referred to, but not limited to, the foregoing preferred Embodiments 1, 2, or 3, and the foregoing possible implementations 1 - 4 are not described herein again.
  • Step 703 Send the PPDU.
  • a method for processing a PPDU includes:
  • Step 800 Receive a PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, where the SE field is located after a last orthogonal frequency division multiplexing OFDM symbol carrying useful information, the indication information is used to indicate Information about the SE field.
  • Step 802 Parse the PPDU, and obtain the BW, MCS, number of streams, or encoding mode of the receiving end. And other information to determine if you need to include SE.
  • Step 804 Parse the number M of OFDM symbols transmitted by the PPDU according to the indication information.
  • step 802 and step 804 are interchangeable.
  • Step 806 When it is determined that the SE needs to be included, according to the indication information and the M, determine a location where the decoding should be stopped or a length of the SE, or a combination of the foregoing.
  • the location at which decoding should be stopped may be determined only by the M and/or including, but not limited to, an agreed stop decoding location, correlation detection, self-detection, and the like.
  • the specific implementation process may refer to, but is not limited to, the foregoing preferred embodiment one, two or three, and the foregoing possible implementation manners one to four, and details are not described herein again.
  • non-LDPC coding includes but is not limited to convolutional codes.
  • the method includes:
  • a method for processing a PPDU includes:
  • Step 901 Determine, among the users adopting the LDPC coding mode, which SEs (or FEs) are needed among the current users according to information such as BW, MCS, number of flows, or modulation mode of each user.
  • the user who needs to include the SE is recorded as the first group user of the LDPC, and the remaining users who do not need the SE are recorded as the second group user of the LDPC.
  • Step 902 Determine, among the users that do not adopt the LDPC coding mode, which SEs (or FEs) are needed among the current users according to information such as BW, MCS, number of flows, or modulation mode of each user.
  • the user who needs to include the SE is recorded as the non-LDPC first group user, and the remaining users who do not need the SE are recorded as the non-LDPC second group user.
  • the LDPC second packet user and the non-LDPC second packet may be merged into the same group, and the packet is not required to be the SE.
  • Step 903 Generate a PPDU, where the PPDU includes indication information, where the PPDU includes a signal extension SE field, where the SE field is located after the last OFDM symbol carrying the useful information, the indication information is used to indicate Information about the SE field.
  • the embodiment may include: 9031, for the non-LDPC first group user, generating the SE length of each user, and the length of the longest SE in the first group of the non-LDPC group is the pending of all users in the first group of the non-LDPC group.
  • the length of the SE field is called the length of the first pending SE field.
  • the shortest PHY padding among the LDPC first group users is the stop decoding position (aligned decoding end position in FIG. 9) of all users in the LDPC first group user.
  • the SE length of the LDPC first packet user is generated, and the length of the longest SE field is used as the length of the SE field of the LDPC first packet user, which is called the second pending SE. The length of the field.
  • MAC padding (or Pre-FEC padding) may be adopted, so that the stop decoding positions of the group of users are all at the end of the last OFDM symbol, or may not Align the position of the group of users to stop decoding.
  • the stop decoding position of the LDPC second packet user may be the end of the last OFDM symbol.
  • the foregoing first, second, or third, or the foregoing possible manners of the first to fourth embodiments, or other possible manners may be used to perform the foregoing determination of the length of the determined SE.
  • a method for processing a PPDU includes:
  • Step 1000 Receive a PPDU, where the PPDU includes indication information, and the PPDU includes a signal.
  • the SE field is extended, and the SE field is located after the last OFDM symbol carrying the useful information, and the indication information is used to indicate related information of the SE field.
  • Step 1002 Parse the PPDU, and obtain information such as the BW, the MCS, the number of streams, or the encoding mode of the receiving end, and determine whether the SE needs to be included.
  • Step 1004 Parse the number M of OFDM symbols transmitted by the PPDU according to the indication information.
  • step 1002 and step 1004 are interchangeable.
  • Step 1006 Determine a user who is the first group of the LDPC, and determine, according to the indication information and the M, a decoding stop position or a length of the SE, or a combination of the foregoing.
  • the user who is determined to be the non-LDPC first packet and the user who does not need the SE packet determine the SE length according to the indication information and the M.
  • SE length indication may be referred to, but not limited to, the foregoing preferred embodiment one, two or three, or the foregoing possible implementation manners one-four.
  • another embodiment provides a PPDU transmission processing device (not shown), which is applied to a wireless local area network, and includes a processing unit 10 for generating a PPDU, the PPDU including indication information, and the PPDU includes a signal extension SE a field, the SE field is located after the last OFDM symbol carrying the useful information, wherein the indication information at least includes: indication information indicating whether the length of the SE field is greater than a threshold T threshold (I2) The threshold T threshold is not 0; the sending unit 30 is configured to send the PPDU.
  • a threshold T threshold is not 0; the sending unit 30 is configured to send the PPDU.
  • a PPDU transmission processing device (not shown), which is applied to a wireless local area network, and includes: a receiving unit 20, configured to receive a physical layer protocol data unit PPDU, where the PPDU includes indication information,
  • the PPDU includes a signal extension SE field, where the SE field is located after the last OFDM symbol carrying the useful information; wherein the indication information at least includes: indicating whether the length of the SE field is greater than a threshold T threshold Indication information (I2); the threshold T threshold is not 0;
  • the processing unit 40 is configured to parse the PPDU, obtain a location that should stop decoding according to the indication information, and stop decoding at the location where the decoding should be stopped.
  • the processing unit 10 or the processing unit 40 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 a transistor logic device, a discrete hardware component, and may be implemented or executed.
  • 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 transmission device of the PPDU 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. 10 is a block diagram of an access point in accordance with another embodiment of the present invention.
  • the access point of FIG. 10 includes an interface 101, a processing unit 102, and a memory 103.
  • Processing unit 102 controls the operation of access point 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 access point 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 PPDU disclosed in the foregoing embodiment 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 may be completed 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 may be directly embodied by hardware processor execution or 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. 11 is a block diagram of a station in accordance with another embodiment of the present invention.
  • the access point of FIG. 11 includes an interface 111, a processing unit 112, and a memory 113.
  • Processing unit 112 controls the operation of 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).
  • NVRAM non-volatile line random access memory
  • the various components of the 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 PPDU disclosed in the foregoing embodiment 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 and performs the steps of the above method in combination with its hardware.
  • the memory 113 stores an instruction that causes the processing unit 112 to perform resource status information indicating a channel through which the access point and the station perform data transmission.
  • the busy state of the sub-resource of the resource; the resource status information is sent to the access point, so that the access point performs resource allocation according to the 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.
  • 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, then coaxial cable, fiber Optical cables, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwaves are included in the fixing of the associated medium.
  • coaxial cable, fiber Optical cables, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwaves are included in the fixing of the associated medium.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

Abstract

Un mode de réalisation de la présente invention concerne un procédé de transmission d'une unité de données de protocole de couche physique (PPDU). Le procédé comprend les étapes consistant à générer et transmettre la PPDU. La PPDU contient des informations d'indication et un champ d'expansion de signal (SE) placé après un dernier symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) contenant des informations utiles. Les informations d'indication comprennent au moins des informations d'indication (I2) utilisées pour indiquer si une longueur du champ SE est supérieure à un seuil, le seuil étant différent de 0.
PCT/CN2015/080440 2015-05-30 2015-05-30 Procédé et dispositif de transmission d'unité de données de protocole de couche physique WO2016191991A1 (fr)

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