WO2023024897A1 - 一种长训练字段序列的传输方法及通信装置 - Google Patents

一种长训练字段序列的传输方法及通信装置 Download PDF

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Publication number
WO2023024897A1
WO2023024897A1 PCT/CN2022/111158 CN2022111158W WO2023024897A1 WO 2023024897 A1 WO2023024897 A1 WO 2023024897A1 CN 2022111158 W CN2022111158 W CN 2022111158W WO 2023024897 A1 WO2023024897 A1 WO 2023024897A1
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Prior art keywords
subcarriers
sequence
components
ltf sequence
discrete
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PCT/CN2022/111158
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English (en)
French (fr)
Inventor
刘辰辰
周亚晶
周正春
杨洋
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华为技术有限公司
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Publication of WO2023024897A1 publication Critical patent/WO2023024897A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a method for transmitting a long training field sequence and a communication device.
  • wireless local area network has become one of the mainstream mobile broadband access technologies.
  • a distributed resource unit (RU) communication method is proposed, that is, the access point (access point, AP) allocates RU for the station (station, STA), and the STA uses the subcarrier of the RU Discrete in frequency domain, discrete RU can obtain wider transmission bandwidth.
  • the STA will send a reference sequence for channel estimation to the AP, for example, the reference sequence for channel estimation is a long training field (long training field, LTF) sequence.
  • the AP can use the received LTF sequence to perform channel estimation.
  • the STA When the STA performs uplink transmission on the discrete RU, it will send the LTF sequence on the discrete RU. How to send LTF sequences on discrete RUs is a problem that needs to be considered.
  • the present application provides a long training field sequence transmission method and communication device to solve the problem of how to transmit LTF sequences on discrete RUs.
  • a method for transmitting an LTF sequence is provided, and the method may be executed by an STA or by components of the STA.
  • the method can be implemented through the following steps: STA determines the LTF sequence, and the LTF sequence is recorded as the first LTF sequence, wherein the first LTF sequence is the sequence segment corresponding to the first RU in the total LTF sequence corresponding to the channel bandwidth, and the LTF sequence in the channel bandwidth
  • the N subcarriers of the LTF are in one-to-one correspondence with the N components of the total LTF sequence.
  • the first RU is the M consecutive first subcarriers in the N subcarriers
  • the first LTF sequence is the M components in the N components.
  • the continuous The M first subcarriers have a corresponding relationship with the M components.
  • the STA sends the first LTF sequence to the AP on the discrete RU, where the discrete RU includes M discontinuous second subcarriers, and the M components of the first LTF sequence are respectively sent on the M discontinuous second subcarriers .
  • the LTF sequence corresponding to the continuous RU on the discrete RU it can help to reduce the PAPR of sending the LTF sequence, and can improve the performance of the channel estimation when the LTF sequence is used for channel estimation.
  • the STA receives a trigger frame from the AP, where the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • Different channel bandwidths may correspond to different LTF total sequences.
  • the STA can obtain the LTF total sequence corresponding to the channel bandwidth.
  • the first RU it can determine the LTF total sequence corresponding to the first RU. First LTF sequence.
  • the trigger frame received by the STA from the AP is also used to indicate that the subcarriers used to send the first LTF sequence are discontinuous.
  • the trigger frame may contain indication information, which is used to indicate that the subcarriers used to send the first LTF sequence are discontinuous, or the indication information is used to indicate that the allocated subcarriers of continuous RUs are mapped to discrete subcarriers upload.
  • the STA maps the subcarriers of the first RU to discrete subcarriers to generate discrete RUs, or the STA maps the subcarriers of the first RU to the subcarriers of the discrete RUs according to the mapping relationship or correspondence relationship, transforming the first RU into a discrete RU.
  • the bandwidth occupied by the discrete RUs is the first bandwidth
  • the STA does not send signals on subcarriers other than the M second subcarriers on the first bandwidth.
  • Not sending a signal can also be considered as inserting a 0 value, sending M components of the corresponding first LTF sequence on the M second subcarriers of the discrete RU, inserting a 0 value between two second subcarriers, and inserting a 0 value i.e. no signal is sent.
  • the first LTF sequence is used by the AP to perform channel estimation.
  • a method for transmitting a long training field sequence is provided, and the method may be executed by an AP or components of the AP.
  • the method can be implemented through the following steps: the AP receives signals from STAs on the discrete RUs, and the AP performs channel estimation on the received signals on the discrete RUs according to the first LTF sequence, where the first LTF sequence is the total channel
  • the first RU is the M consecutive first RUs in the N subcarriers
  • the subcarriers, the first LTF sequence is M components in the N components, the M continuous first subcarriers have a corresponding relationship with the M components, the discrete RU includes discontinuous M second subcarriers, and the first LTF sequence
  • the M components of are respectively used for channel estimation on the received signals on the M second subcarriers.
  • the AP sends a trigger frame to the STA, where the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • Different channel bandwidths may correspond to different LTF total sequences.
  • the STA can obtain the LTF total sequence corresponding to the channel bandwidth.
  • the STA can be in the LTF total sequence.
  • a first LTF sequence corresponding to the first RU is determined. In this way, the transmitting and receiving parties can align the LTF sequence, so as to ensure the performance of channel estimation.
  • the trigger frame is also used to indicate that the subcarriers for sending the first LTF sequence are discontinuous.
  • the indication function of the frame it can instruct the STA to map the subcarriers of the continuous RUs to discrete subcarriers to generate discrete RUs when receiving continuous RUs; or in other words, according to the subcarriers of the first RU and the The mapping relationship or corresponding relationship between subcarriers transforms the first RU into discrete RUs.
  • a communication device may be a station STA, or a device (for example, a chip, or a chip system, or a circuit) in the STA, or a device that can be used in conjunction with the STA.
  • the communication device may include a one-to-one corresponding module for executing the method/operation/step/action described in the first aspect.
  • the module may be a hardware circuit, or software, or a combination of hardware circuit and software.
  • the communication device may include a processing module and a communication module. The processing module is used to call the communication module to perform receiving and/or sending functions.
  • a processing module configured to determine the LTF sequence, the LTF sequence is recorded as the first LTF sequence, wherein the first LTF sequence is the sequence segment corresponding to the first RU in the total LTF sequence corresponding to the channel bandwidth, and the channel bandwidth
  • the N subcarriers of the LTF are in one-to-one correspondence with the N components of the total LTF sequence.
  • the first RU is the M consecutive first subcarriers in the N subcarriers
  • the first LTF sequence is the M components in the N components.
  • the continuous The M first subcarriers have a corresponding relationship with the M components.
  • a communication module configured to send the first LTF sequence to the AP on discrete RUs, where the discrete RUs include discontinuous M second subcarriers, and the M components of the first LTF sequence are respectively on the discontinuous M second subcarriers. sent on subcarriers.
  • the communication module is further configured to receive a trigger frame from the AP, where the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • the trigger frame received by the communication module from the AP is also used to indicate that the subcarriers used to send the first LTF sequence are discontinuous.
  • the bandwidth occupied by the discrete RUs is the first bandwidth
  • the STA does not send signals on subcarriers other than the M second subcarriers on the first bandwidth.
  • the first LTF sequence is used by the AP to perform channel estimation.
  • a communication device may be a station AP, or a device (for example, a chip, or a chip system, or a circuit) in the AP, or a device that can be used in conjunction with the AP.
  • the communication device may include a one-to-one corresponding module for executing the method/operation/step/action described in the first aspect.
  • the module may be a hardware circuit, or software, or a combination of hardware circuit and software.
  • the communication device may include a processing module and a communication module. The processing module is used to call the communication module to perform receiving and/or sending functions.
  • the communication module is used to receive signals from STAs on the discrete RUs; the processing module is used to perform channel estimation on the signals received on the discrete RUs according to the first LTF sequence, wherein the first LTF sequence is the channel
  • the first LTF sequence is the channel
  • the sequence segment corresponding to the first resource unit RU in the LTF total sequence corresponding to the total bandwidth, the N subcarriers in the total channel bandwidth correspond to the N components of the LTF total sequence
  • the first RU is the continuous M of the N subcarriers first subcarriers
  • the first LTF sequence is M components in the N components
  • the continuous M first subcarriers have a corresponding relationship with the M components
  • the discrete RU includes discontinuous M second subcarriers , the M components of the first LTF sequence are respectively used to perform channel estimation on the received signals on the M second subcarriers.
  • the communication module is further configured to send a trigger frame to the STA, where the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • the trigger frame is also used to indicate that the subcarriers for sending the first LTF sequence are discontinuous.
  • the embodiment of the present application provides a communication device, where the communication device includes an interface circuit and a processor, and the processor and the interface circuit are coupled to each other.
  • the processor implements the method described in the above first aspect and each possible design of the first aspect through a logic circuit or executing code instructions.
  • the interface circuit is used to receive signals from other communication devices other than the communication device and transmit to the processor or send signals from the processor to other communication devices other than the communication device. It can be understood that the interface circuit may be a transceiver or an input/output interface.
  • the communication device may further include a memory for storing instructions executed by the processor, or storing input data required by the processor to execute the instructions, or storing data generated after the processor executes the instructions.
  • the memory may be a physically independent unit, or may be coupled with the processor, or the processor includes the memory.
  • the processor is configured to determine the LTF sequence, and the LTF sequence is denoted as the first LTF sequence, where the first LTF sequence is the LTF sequence corresponding to the first RU in the total LTF sequence corresponding to the channel bandwidth
  • the N subcarriers in the channel bandwidth correspond to the N components of the total LTF sequence
  • the first RU is the M consecutive first subcarriers in the N subcarriers
  • the first LTF sequence is M in the N components components
  • the M consecutive first subcarriers have a corresponding relationship with the M components.
  • the interface circuit is configured to send the first LTF sequence to the AP on the discrete RU, wherein the discrete RU includes discontinuous M second subcarriers, and the M components of the first LTF sequence are respectively in the discontinuous M second subcarriers. sent on subcarriers.
  • the interface circuit is further configured to receive a trigger frame from the AP, where the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • the trigger frame received by the communication module from the AP is also used to indicate that the subcarriers used to send the first LTF sequence are discontinuous.
  • the bandwidth occupied by the discrete RUs is the first bandwidth
  • the STA does not send signals on subcarriers other than the M second subcarriers on the first bandwidth.
  • the first LTF sequence is used by the AP to perform channel estimation.
  • the embodiment of the present application provides a communication device, where the communication device includes an interface circuit and a processor, and the processor and the interface circuit are coupled to each other.
  • the processor implements the method described in the above second aspect and each possible design of the second aspect through a logic circuit or executing code instructions.
  • the interface circuit is used to receive signals from other communication devices other than the communication device and transmit to the processor or send signals from the processor to other communication devices other than the communication device. It can be understood that the interface circuit may be a transceiver or an input/output interface.
  • the communication device may further include a memory for storing instructions executed by the processor, or storing input data required by the processor to execute the instructions, or storing data generated after the processor executes the instructions.
  • the memory may be a physically independent unit, or may be coupled with the processor, or the processor includes the memory.
  • the interface circuit is used to receive signals from STAs on discrete RUs; the processor is used to perform channel estimation on signals received on discrete RUs according to the first LTF sequence, wherein,
  • the first LTF sequence is the sequence segment corresponding to the first resource unit RU in the LTF total sequence corresponding to the total channel bandwidth.
  • the N subcarriers in the total channel bandwidth correspond to the N components of the LTF total sequence.
  • the first RU is N
  • the first LTF sequence is M components in the N components, and the M continuous first subcarriers have a corresponding relationship with the M components; the discrete RU includes discontinuous
  • the M second subcarriers and the M components of the first LTF sequence are respectively used to perform channel estimation on received signals on the M second subcarriers.
  • the communication module is further configured to send a trigger frame to the STA, where the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • the trigger frame is also used to indicate that the subcarriers for sending the first LTF sequence are discontinuous.
  • the embodiment of the present application provides a computer-readable storage medium, where a computer program or readable instruction is stored in the computer-readable storage medium, and when the computer program or readable instruction is executed by a communication device, the The methods described in the above aspects or in each possible design of the aspects are executed.
  • the embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory.
  • the memory is used to store programs, instructions or codes; the processor is used to execute the programs, instructions or codes stored in the memory, so as to implement the methods described in the above aspects or possible designs of each aspect.
  • the system-on-a-chip may consist of chips, or may include chips and other discrete devices.
  • a computer program product including instructions, which, when executed by a communication device, cause the method described in the first aspect or each possible design of the aspect to be executed.
  • FIG. 1 is one of the schematic diagrams of the WLAN system architecture in the embodiment of the present application.
  • FIG. 2 is the second schematic diagram of the WLAN system architecture in the embodiment of the present application.
  • FIG. 3 is a schematic flow diagram of a transmission method for a long training field sequence in an embodiment of the present application
  • FIG. 4 is a schematic diagram of subcarrier distribution and RU distribution of 80MHz in the embodiment of the present application.
  • Fig. 5 is one of the schematic diagrams generated by the LTF sequence of 26-tone RU in the embodiment of the present application;
  • Fig. 6 is the second schematic diagram of the LTF sequence generation of 26-tone RU in the embodiment of the present application.
  • FIG. 7 is one of the structural schematic diagrams of the communication device in the embodiment of the present application.
  • FIG. 8 is the second structural diagram of the communication device in the embodiment of the present application.
  • the present application provides a transmission method of a long training field sequence in order to solve the problem of transmitting LTF sequences on discrete RUs.
  • the method and the device are conceived based on the same or similar technology. Since the principle of solving the problem of the method and the device is similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • the transmission method of the long training field sequence provided by this application can be applied to a wireless local area network (wireless local area network, WLAN) system, and can be applied to IEEE 802.11 system standards, such as 802.11a/b/g, 802.11n, 802.11ac, 802.11ax , or its next generation, such as 802.11be or the next generation standard.
  • IEEE 802.11 system standards such as 802.11a/b/g, 802.11n, 802.11ac, 802.11ax , or its next generation, such as 802.11be or the next generation standard.
  • 802.11n can also be called high throughput (high throughput, HT); 802.11ac can also be called very high throughput (very high throughput, VHT); 802.11ax can also be called high efficient (high efficient, HE) or Wi -Fi 6; 802.11be can also be called extremely high throughput (EHT) or (Wi-Fi 7), and for the standards before HT, such as 802.11a/b/g, etc. are collectively called non-high throughput (Non-HT).
  • the method provided in this application can also be applied to wireless local area network systems including but not limited to Internet of Things (Internet of Things, IoT) networks or Vehicle to X (Vehicle to X, V2X) networks.
  • IoT Internet of Things
  • V2X Vehicle to X
  • a WLAN system 100 to which this embodiment of the present application is applicable may include: one or more APs, and one or more stations (stations, STAs).
  • FIG. 1 takes one AP101 and two STAs as an example, and the two STAs are denoted by STA102-1 and STA102-1.
  • AP101 is associated with STA102-1 and STA102-1.
  • the STA associated with the AP can receive the wireless frame sent by the AP, and can also send the wireless frame to the AP.
  • the embodiment of the present application is also applicable to the communication between APs, for example, each AP can communicate with each other through a distributed system (DS), and the embodiment of the present application is also applicable to the communication between STAs .
  • DS distributed system
  • the WLAN system 100 may also include multiple APs.
  • Figure 2 shows two APs, taking each AP connected to two STAs as an example. It can be understood that the WLAN system may also include more APs and more STAs.
  • the two APs are AP101-1 and AP101-2 respectively, and AP101-1 is connected to two STAs, denoted by STA102-1 and STA102-2.
  • AP101-2 is connected to two STAs, denoted by STA102-3 and STA102-4.
  • the AP and STA designed in the embodiment of the present application are described below.
  • AP also known as wireless access point or bridge or hotspot.
  • An AP can access a server or a communication network.
  • AP itself is also a station.
  • An AP is a device deployed in a wireless communication network or a WLAN network to provide wireless communication functions for its associated stations, and the AP can be used as the center of the WLAN system.
  • the AP can be a base station, a router, a gateway, a repeater, a communication server, a switch, or a network bridge, etc.
  • the base station may include various forms of macro base stations, micro base stations, relay stations, and the like.
  • the above-mentioned devices are collectively referred to as AP in the embodiment of the present application.
  • STA can be various user terminals, user devices, access devices, subscriber stations, subscriber units, mobile stations, user agents, user equipment or other names with wireless communication functions, where the user terminals can include various wireless communication functions Functional handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of user equipment (user equipment, UE), mobile station (mobile station, MS), terminal (terminal ), terminal equipment, portable communication device, handset, portable computing device, entertainment device, gaming device or system, global positioning system device or any other suitable device configured for network communication via a wireless medium, etc.
  • UE user equipment
  • MS mobile station
  • terminal terminal equipment
  • portable communication device handset
  • portable computing device entertainment device
  • gaming device or system global positioning system device or any other suitable device configured for network communication via a wireless medium, etc.
  • STA the above-mentioned devices are collectively referred to as STA in the embodiment of the present application.
  • the AP/STA involved in FIG. 1 and FIG. 2 can be implemented by one device, or jointly implemented by multiple devices, or can be a functional module in one device, which is not specifically limited in this embodiment of the present application. It can be understood that the above function can be a network element in a hardware device, a software function running on dedicated hardware, or a virtualization function instantiated on a platform (for example, a cloud platform).
  • the technical solutions provided by the embodiments of the present application are applicable to various system architectures.
  • the network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application.
  • the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
  • LPI low power indoor
  • the maximum power is 36 dBm Watts (decibel-milliwatts, dBm)
  • the maximum power spectral density is 5 decibel milliwatts/megahertz (decibel-milliwatts/megahertz, dBm/MHz)
  • the maximum power is 24dBm
  • the maximum power spectral density is -1dBm/MHz .
  • the power transmitted by the device is limited by the maximum power and maximum power spectral density at the same time, that is, the power transmitted by the device cannot exceed the maximum power value, nor can it exceed the maximum power spectral density, that is, the transmission power per MHz cannot exceed a given value.
  • Distributed RUs may also be called discrete RUs or other names.
  • discrete RUs are used as an example for illustration.
  • the subcarriers of continuous RUs in the frequency domain are mapped to discrete subcarriers, and the transmission bandwidth is widened because the RUs become discrete in the frequency domain.
  • the transmission bandwidth is widened, which means that a larger transmission bandwidth can be obtained.
  • Consecutive RU an RU composed of multiple consecutive subcarriers, or a continuous RU is an RU composed of two consecutive subcarrier groups.
  • the multiple subcarriers included in each consecutive subcarrier group are continuous.
  • All RUs supported in 802.11ax can be understood as continuous RUs.
  • Consecutive RUs may also be referred to as regular RUs.
  • the continuous RU may also have other names, and this embodiment of the present application does not limit the specific name of the continuous RU.
  • the RU including multiple discrete subcarriers in the frequency domain may be referred to as a discrete RU, that is, the discrete RU includes multiple subcarriers, and any two subcarriers are discrete in the frequency domain.
  • a discrete RU may also include multiple discrete subcarrier groups in the frequency domain, where one subcarrier group includes one or more subcarriers. The multiple subcarriers included in one subcarrier group are multiple consecutive subcarriers.
  • the STA will send a reference sequence to the AP, and the reference sequence is used for the AP to perform channel estimation.
  • the reference sequence may be, for example, an LTF sequence, and the LTF sequence may be an extremely high throughput long training field (EHT-LTF) sequence, or other sequences used for channel estimation.
  • EHT-LTF extremely high throughput long training field
  • the sequence used for channel estimation is an LTF sequence as an example for introduction.
  • the STA transmits data on discrete RUs, then the STA will send the LTF sequence on the discrete RUs.
  • the method for sending the LTF sequence on discrete RUs is described below.
  • the channel bandwidth is the total transmission bandwidth
  • 802.11ax currently supports the following channel bandwidth configurations: 20MHz, 40MHz, 80MHz, 160MHz and 80+80MHz. Among them, the difference between 160MHz and 80+80MHz is that the former is a continuous frequency band, while the two 80MHz of the latter can be separated. In 802.11be, 320MHz is supported.
  • Different channel bandwidths may correspond to LTF sequences.
  • the LTF sequence corresponding to the channel bandwidth is referred to as the total LTF sequence in this application.
  • a channel bandwidth corresponds to a total sequence of LTFs.
  • the channel bandwidth includes a plurality of consecutive subcarriers, and the subcarriers have corresponding serial numbers.
  • a channel bandwidth of 80 MHz may include subcarriers with serial numbers from -500 to 500.
  • the length of the total LTF sequence may be the same as the number of subcarriers contained in the channel bandwidth, so that the components of the total LTF sequence have a one-to-one correspondence with the subcarrier numbers of the channel bandwidth.
  • the channel bandwidth includes N subcarriers, and the N subcarriers are in one-to-one correspondence with the N components of the total LTF sequence.
  • the RU resource allocated by the AP to the STA is a continuous RU resource.
  • the STA communicates with the AP on the discrete RU, it needs to separate the continuous RU resources to obtain the discrete RU.
  • How to discretize the resources of continuous RUs in the frequency domain to obtain discrete RUs is not limited in this application. For example, a corresponding relationship between continuous RUs and discrete RUs may be set, and the continuous RUs are discretized into discrete RUs according to the corresponding relationship.
  • a of the method for sending an LTF sequence on a discrete RU according to the total LTF sequence corresponding to the channel bandwidth, the components corresponding to each subcarrier of the discrete RU are determined, and the corresponding components are respectively sent on each subcarrier of the discrete RU. components, so that the LTF sequence can be sent on discrete RUs.
  • the peak to average power ratio (PAPR) obtained by this scheme is relatively high, and the performance of channel estimation is low.
  • the embodiment of the present application provides a communication method based on the LTF sequence, which can reduce the PAPR of sending the LTF sequence on discrete RUs, and improve the performance of channel estimation.
  • the station STA determines a first LTF sequence.
  • the channel bandwidth includes N subcarriers, and the N subcarriers correspond to the N components of the LTF total sequence one by one.
  • the channel bandwidth includes the first RU, and the first RU is the consecutive M subcarriers in the N subcarriers.
  • the M subcarriers included in the first RU may be recorded as M first subcarriers.
  • the first LTF sequence is a sequence segment corresponding to the first RU in the total LTF sequence corresponding to the channel bandwidth, and the M consecutive first subcarriers have a corresponding relationship with the M components. That is, the first LTF sequence is a sequence composed of M components corresponding to the M first subcarriers.
  • the STA sends the first LTF sequence to the AP on discrete RUs.
  • the discrete RUs are M discontinuous subcarriers among the above N subcarriers, and the M subcarriers included in the discrete RUs may be recorded as M second subcarriers.
  • the first LTF sequence is sent on discrete RUs, that is, the M components of the first LTF sequence are respectively sent on M second subcarriers. It can be understood that the STA determines the discrete RU that has a corresponding relationship with the first RU, or the STA maps the first LTF sequence corresponding to the first RU to a discrete RU for transmission, and the discrete RU and the first RU There is a corresponding relationship between them.
  • the correspondence between the first RU and the discrete RU may be predefined, or notified by the AP to the STA.
  • the AP determines the first LTF sequence.
  • the AP knows the first RU allocated to the STA and the total LTF sequence corresponding to the channel bandwidth, and the AP can determine the sequence segment corresponding to the first RU in the total LTF sequence corresponding to the channel bandwidth, that is, the first LTF sequence.
  • the AP performs channel estimation on received signals on discrete RUs according to the first LTF sequence.
  • the M components of the first LTF sequence are respectively used for channel estimation on the received signals on the M second subcarriers.
  • the AP may determine the discrete RU according to the correspondence between the first RU and the discrete RU.
  • the AP can determine discrete RUs in the same manner as the STA.
  • the specific method for the STA and the AP to determine the discrete RU is not limited in this embodiment of the present application.
  • the STA transmits M components of the first LTF sequence on the M second subcarriers, and the AP receives M reference signals on the M second subcarriers respectively, and the reference signals are the received signals in S304.
  • the M reference signals are signals after the M components of the first LTF sequence are interfered by channel noise.
  • the AP can perform channel estimation on the M second subcarriers respectively according to the M components of the first LTF sequence known in advance and the received M reference signals, and obtain channel estimation results of the M second subcarriers.
  • the STA can send data on M second subcarriers, and the data can be divided into M data components, and the M data components are respectively sent on M second subcarriers, and the AP receives M data components.
  • the AP can analyze the M data components according to the channel estimation results of the M second subcarriers, and obtain correct analysis results.
  • the AP may allocate RU resources to multiple STAs, and may also receive signals from multiple STAs.
  • the solutions related to each of the multiple STAs you can refer to the STA solutions described in the embodiments of this application. .
  • the LTF sequences corresponding to the continuous RUs are sent on the discrete RUs, which can reduce the PAPR, thereby improving the performance of channel estimation.
  • S300 may also be included before S301.
  • the AP sends a trigger frame (trigger frame) to the STA, and correspondingly, the STA receives the trigger frame from the AP.
  • a trigger frame (trigger frame)
  • the trigger frame is used to indicate the channel bandwidth and the first RU allocated to the STA.
  • the AP when there are multiple STAs under the AP, the AP will send a trigger frame to the multiple STAs, and the trigger frame sent to each STA will carry indication information of the RU allocated to the STA.
  • the multi-user transmission of 802.11ax and 802.11be is based on Orthogonal Frequency Division Multiple Access (OFDMA) technology to achieve the goal of improving the average throughput of the system in high-density scenarios.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • users are distinguished according to RU In this mode, the user's data is carried on each RU, so from the perspective of the total time-frequency resources, in each time slice, there may be multiple users sending at the same time.
  • the trigger frame sent by the AP to the STA may include channel bandwidth and RU resource allocation information.
  • the STA can determine the total LTF sequence corresponding to the channel bandwidth.
  • the STA may determine the first RU allocated to the STA by the AP according to the RU resource allocation information indicated by the received trigger frame.
  • the trigger frame sent by the AP to the STA may also be used to indicate that the subcarriers of the first LTF sequence are discontinuous, or in other words, the trigger frame may also instruct the AP to send the first LTF sequence on discontinuous subcarriers.
  • the STA discretizes the continuous RUs (that is, the first RU) in the frequency domain to obtain the discrete RUs.
  • Channel bandwidth may also be referred to as carrier bandwidth.
  • the bandwidth occupied by discrete RUs is recorded as the first bandwidth, and the channel bandwidth includes the first bandwidth.
  • the bandwidth occupied by the discrete RUs may be understood as the bandwidth occupied by the first subcarrier to the last subcarrier of the discrete RUs.
  • the STA sends the first LTF sequence to the AP on discrete RUs.
  • the STA sends the first LTF sequence on discrete M second subcarriers on the first bandwidth, and divides M subcarriers on the first bandwidth. Signals are not sent on subcarriers other than the second subcarrier. It can be understood that, in a multi-user transmission scenario, other STAs may transmit signals on the subcarriers where one STA does not transmit signals.
  • an RU including K subcarriers may be called a K-tone RU.
  • the entire bandwidth can be composed of an entire 996-tone RU, two 484-tone RUs, four 242-tone RUs, or Various combinations such as 26-tone RU, 52-tone RU or 106-tone RU.
  • the leftmost vertical line of FIG. 4 corresponds to the lowest frequency of the channel bandwidth, and the rightmost vertical line of FIG. 4 corresponds to the highest frequency of the channel bandwidth.
  • 484L and 484R represent the left half and the right half of the 484-tone RU, respectively containing 242 subcarriers, which is another schematic way of 484+5 direct current (DC) subcarriers.
  • 5DC represents 5 subcarriers in the entire channel bandwidth. These 5 subcarriers are easily interfered by the DC signal of the device itself, and are generally not used for data transmission.
  • 26-tone RUs can be numbered: 1 st , 2 nd ,...,36 th .
  • 52-tone RU can be labeled: 1 st ,2 nd ,...,16 th ; 106-tone RU can be labeled: 1 st ,2 nd ,...,8 th ; 242-tone RU can be labeled: 1 st , 2 nd , 3 rd , 4 th ; label 484-tone RU: 1 st , 2 nd .
  • the distance between adjacent subcarriers of discrete RUs can be as follows: 26- The distance between adjacent subcarriers in tone RU is 19, that is, 18 0s are inserted between two subcarriers; the distance between adjacent subcarriers in 52-tone RU is 10, that is, 9 0s are inserted between two subcarriers; The distance between adjacent subcarriers in 106-tone RU is 5, that is, four 0s are inserted between two subcarriers; the distance between adjacent subcarriers in 2422-tone RU is 2, that is, one zero is inserted between two subcarriers 0; The distance between adjacent subcarriers in 484-tone RU is 2, that is, a 0 is inserted between two subcarriers. A 0 is inserted between the two second subcarriers
  • the first RU allocated by the AP to the STA is the 3rd consecutive 26-tone RU. As shown in FIG. 5 , it shows the relationship between continuous RUs and discrete RUs, and the manner of mapping the first LTF on the discrete RUs.
  • the number N of subcarriers included in the channel bandwidth of 80MHz is 1001, and the serial numbers of the N subcarriers are [–500:+500] respectively.
  • the position of the discretized discrete RU is [(-500+k-1):13:(-175+k-1)].
  • the position of the discretized discrete RU is [-500:13:-175], that is, -500-487-474-461-448-435-422-409- 396-383-370-357-344-331-318-305-292-279-266-253-240-227-214-201-188-175.
  • the first RU is a continuous RU, and the first RU includes 26 consecutive subcarriers.
  • the first RU includes subcarriers whose sequence numbers are [–445:–420].
  • the total LTF sequence includes 1001 components, and the component subscripts can also be represented by [–500:–500]. There is a one-to-one correspondence between subcarriers.
  • the first LTF sequence is a sequence composed of M components whose subscripts are [–445:–420].
  • a discrete RU is an RU in which the first RU is discrete in the frequency domain.
  • a discrete RU may include 26 subcarriers whose serial numbers are [(-500+3-1):13:(-175+3-1)].
  • the serial numbers of the 26 subcarriers of the RU are -498-485-472-459-446-433-420-407-394-381-368-355-342-329-316-303-290-277-264-251-238- 225-212-199-186-173.
  • 26 components with subscripts [–445:–420] are respectively transmitted on 26 subcarriers with sequence numbers [(-500+3-1):13:(-175+3-1)].
  • the above also provides an embodiment A of the method for sending LTF sequences on discrete RUs.
  • the components corresponding to each subcarrier of the discrete RU are determined, and on each subcarrier of the discrete RU The corresponding components are sent respectively, so that the LTF sequence is sent on discrete RUs.
  • the consecutive RUs allocated by the AP to the STA include subcarriers with sequence numbers [–445:–420], and the continuous RUs are discrete in the frequency domain It is a discrete RU, and the discrete RU includes 26 subcarriers whose sequence numbers are [(-500+3-1):13:(-175+3-1)].
  • the second LTF sequence is sent on the discrete RU, and the second LTF sequence The subscripts of the 26 components are in one-to-one correspondence with the serial numbers of the 26 subcarriers of the discrete RU.
  • the second LTF sequence is a sequence composed of components with subscripts [(-500+3-1):13:(-175+3-1)] in the total LTF sequence.
  • Table 1 shows the comparison of the PAPR of the LTF sequence at a bandwidth of 80 MHz between the method of the embodiment in FIG. 3 and the method of the embodiment A.
  • the methods provided in the embodiments of the present application are introduced from the perspectives of the AP, the STA, and the interaction between the STA and the AP.
  • the STA and the AP may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above-mentioned functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • this embodiment of the present application also provides a communication device 700, which can be a STA or an AP, or a device in an STA or an AP, or can communicate with a STA or AP matches the device used.
  • the communication device 700 may include a module corresponding to the method/operation/step/action performed by the STA or the AP in the above method embodiment.
  • the module may be a hardware circuit, or software, or a Hardware circuit combined with software implementation.
  • the communication device may include a processing module 701 and a communication module 702 .
  • the processing module 701 is configured to call the communication module 702 to perform receiving and/or sending functions.
  • the processing module 701 is used to determine the first LTF sequence
  • the communication module 702 is used to send the first LTF sequence to the AP on discrete RUs.
  • the communication module 702 When used to execute the method performed by the AP: the communication module 702 is used to receive a signal from the STA on the discrete RU, and the processing module 701 is used to perform the signal received on the discrete RU according to the first LTF sequence channel estimation. More detailed descriptions about the above-mentioned processing module 701 and communication module 702 can be directly obtained by referring to related descriptions in the method embodiment shown in FIG. 3 , and will not be repeated here.
  • a communication device 800 provided in the embodiment of the present application is used to realize the functions of STA or AP in the above method.
  • the communication device may be the STA, or a device in the STA, or a device that can be matched with the STA.
  • the device may be the AP, or a device in the AP, or a device that can be used in conjunction with the AP.
  • the communication device may be a system on a chip.
  • the system-on-a-chip may be composed of chips, or may include chips and other discrete devices. As shown in FIG.
  • the communication device 800 includes a processor 810 and an interface circuit 820 .
  • the processor 810 and the interface circuit 820 are coupled to each other.
  • the interface circuit 820 may be a transceiver or an input/output interface.
  • the communication device 800 may further include a memory 830 for storing instructions executed by the processor 810, or storing input data required by the processor 810 to execute the instructions, or storing data generated by the processor 810 after executing the instructions.
  • the processor 810 is used to implement the functions of the above processing module 701
  • the interface circuit 820 is used to implement the functions of the above communication module 702 .
  • 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, or a discrete hardware component, and may implement or Execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application.
  • a general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
  • the processor in the embodiments of the present application can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor can be a microprocessor, or any conventional processor.
  • the memory 830 may be a non-volatile memory, such as a hard disk (hard disk drive, HDD) or a solid-state drive (solid-state drive, SSD), etc., and may also be a volatile memory (volatile memory), For example random-access memory (random-access memory, RAM).
  • a memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is used for storing program instructions and/or data.
  • Some or all of the operations and functions performed by the STA described in the above method embodiments of the present application, or some or all of the operations and functions performed by the AP may be implemented by a chip or an integrated circuit.
  • an embodiment of the present application further provides a chip, including a processor, configured to support the communication device in implementing the functions involved in the STA or AP in the above method embodiment.
  • the chip is connected to a memory or the chip includes a memory, and the memory is used for storing necessary program instructions and data of the communication device.
  • An embodiment of the present application provides a computer-readable storage medium storing a computer program, where the computer program includes instructions for executing the foregoing method embodiments.
  • Embodiments of the present application provide a computer program product containing instructions, which, when run on a computer, enable the above method embodiments to be executed.
  • At least one means one or more
  • multiple means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

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Abstract

一种长训练字段序列的传输方法及通信装置，以期在离散的RU上发送LTF序列，降低PAPR。该方法为：STA确定LTF序列，该LTF序列记为第一LTF序列，其中，第一LTF序列为信道带宽对应的LTF总序列中与第一RU对应的序列段，信道带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，该连续的M个第一子载波与该M个分量具有对应关系。STA在离散RU上向AP发送第一LTF序列，其中，离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别在该不连续的M个第二子载波上发送。

Description

一种长训练字段序列的传输方法及通信装置
相关申请的交叉引用
本申请要求在2021年08月24日提交中国专利局、申请号为202110976975.8、申请名称为“一种长训练字段序列的传输方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及一种长训练字段序列的传输方法及通信装置。
背景技术
随着移动互联网的发展和智能终端的普及，数据流量快速增长。无线局域网(wireless local area network，WLAN)凭借高速率和低成本方面的优势，成为主流的移动宽带接入技术之一。在无线局域网通信系统中提出一种分布式资源单元(resource unit,RU)的通信方式，即，接入点(access point,AP)为站点(station，STA)分配RU，STA将RU的子载波在频域上离散，离散RU能够获得更宽的发送带宽。
STA在上行传输时，会向AP发送用于信道估计的参考序列，例如，用于信道估计的参考序列为长训练字段(long training field，LTF)序列。AP可以利用接收的LTF序列进行信道估计。当STA在离散RU上进行上行传输时，会在离散RU上发送LTF序列。如何在离散的RU上发送LTF序列，是需要考虑的问题。
发明内容
本申请提供一种长训练字段序列的传输方法及通信装置，用以解决如何在离散的RU上发送LTF序列的问题。
第一方面，提供一种LTF序列的传输方法，该方法可以由STA执行，也可以由STA的部件执行。该方法可以通过以下步骤实现：STA确定LTF序列，该LTF序列记为第一LTF序列，其中，第一LTF序列为信道带宽对应的LTF总序列中与第一RU对应的序列段，信道带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，该连续的M个第一子载波与该M个分量具有对应关系。STA在离散RU上向AP发送第一LTF序列，其中，离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别在该不连续的M个第二子载波上发送。通过在离散RU上发送连续RU对应的LTF序列，能够有助于降低发送LTF序列的PAPR，在LTF序列用于信道估计时能够提高信道估计的性能。
在一个可能的设计中，STA接收来自AP的触发帧，触发帧用于指示信道带宽、以及分配给该STA的第一RU。不同的信道带宽可能对应不同的LTF总序列，STA通过接收信道带宽，能够获取与该信道带宽相对应的LTF总序列，通过接收第一RU，能够在LTF总序列中确定与第一RU对应的第一LTF序列。
可选的，STA从AP接收的触发帧还用于指示用于发送第一LTF序列的子载波是不连 续的。该触发帧中可以包含指示信息，该指示信息用于指示用于发送第一LTF序列的子载波是不连续的，或者该指示信息用于指示将分配的连续RU的子载波映射到离散的子载上。STA根据该触发帧的指示，将第一RU的子载波映射到离散的子载波上，生成离散RU，或者说STA根据第一RU的子载波与离散RU的子载波之间的映射关系或对应关系，将第一RU变换为离散RU。
在一个可能的设计中，离散RU所跨占的带宽为第一带宽，STA在第一带宽上除该M个第二子载波之外的子载波上不发送信号。不发送信号也可以认为是插入0值，在离散RU的M个第二子载波上发送对应的第一LTF序列的M个分量，在两个第二子载波之间插入0值，插入0值即不发送信号。在该STA不发送信号的子载波上可能会存在其他STA发送的信号。
在一个可能的设计中，所述第一LTF序列用于所述AP进行信道估计。
第二方面，提供一种长训练字段序列的传输方法，该方法可以由AP执行，也可以由AP的部件执行。该方法可以通过以下步骤实现：AP在离散RU上接收来自STA的信号，AP根据第一LTF序列，对在离散RU上的接收的信号进行信道估计，其中，其中，第一LTF序列为信道总带宽对应的LTF总序列中与第一RU对应的序列段，信道总带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，连续的M个第一子载波与M个分量具有对应关系，离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别用于对M个第二子载波上的接收信号进行信道估计。通过用连续RU对应的LTF序列对在离散RU上的接收信号进行信道估计，能够有助于提高信道估计的性能。
在一个可能的设计中，AP向STA发送触发帧，触发帧用于指示所述信道带宽、以及分配给所述STA的所述第一RU。不同的信道带宽可能对应不同的LTF总序列，通过向STA指示信道带宽，能够使STA获取与该信道带宽相对应的LTF总序列，通过向STA指示第一RU，能够是STA在LTF总序列中确定与第一RU对应的第一LTF序列。这样能够使得收发双方对齐LTF序列，保证信道估计的性能。
可选的，触发帧还用于指示发送第一LTF序列的子载波是不连续的。通过触发帧的该指示作用，能够指示STA在接收到连续RU时，将连续RU的子载波映射到离散的子载波上，以生成离散RU；或者说根据第一RU的子载波与离散RU的子载波之间的映射关系或对应关系，将第一RU变换为离散RU。
第三方面，提供一种通信装置，该通信装置可以是站点STA，也可以是STA中的装置(例如，芯片，或者芯片系统，或者电路)，或者是能够和STA匹配使用的装置。一种设计中，该通信装置可以包括执行第一方面中所描述的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该通信装置可以包括处理模块和通信模块。处理模块用于调用通信模块执行接收和/或发送的功能。示例性地：处理模块，用于确定LTF序列，该LTF序列记为第一LTF序列，其中，第一LTF序列为信道带宽对应的LTF总序列中与第一RU对应的序列段，信道带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，该连续的M个第一子载波与该M个分量具有对应关系。通信模块，用于在离散RU上向AP发送第一LTF序列，其中，离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别在该不连续的M个 第二子载波上发送。
在一个可能的设计中，通信模块还用于接收来自AP的触发帧，触发帧用于指示信道带宽、以及分配给该STA的第一RU。可选的，所述通信模块从AP接收的触发帧还用于指示用于发送第一LTF序列的子载波是不连续的。
在一个可能的设计中，离散RU所跨占的带宽为第一带宽，STA在第一带宽上除该M个第二子载波之外的子载波上不发送信号。
在一个可能的设计中，所述第一LTF序列用于所述AP进行信道估计。
第三方面以及各个可能的设计的有益效果可以参考第一方面对应部分的描述。
第四方面，提供一种通信装置，该通信装置可以是站点AP，也可以是AP中的装置(例如，芯片，或者芯片系统，或者电路)，或者是能够和AP匹配使用的装置。一种设计中，该通信装置可以包括执行第一方面中所描述的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该通信装置可以包括处理模块和通信模块。处理模块用于调用通信模块执行接收和/或发送的功能。示例性地：通信模块，用于在离散RU上的接收来自STA的信号；处理模块用于根据第一LTF序列，对在离散RU上接收的信号进行信道估计，其中，第一LTF序列为信道总带宽对应的LTF总序列中与第一资源单元RU对应的序列段，信道总带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，该连续的M个第一子载波与该M个分量具有对应关系；离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别用于对该M个第二子载波上的接收信号进行信道估计。
在一个可能的设计中，通信模块还用于向STA发送触发帧，触发帧用于指示信道带宽、以及分配给STA的第一RU。
可选的，触发帧还用于指示发送所述第一LTF序列的子载波是不连续的。
第四方面以及各个可能的设计的有益效果可以参考第二方面对应部分的描述。
第五方面，本申请实施例提供一种通信装置，该通信装置包括接口电路和处理器，处理器和接口电路之间相互耦合。处理器通过逻辑电路或执行代码指令用于实现上述第一方面、第一方面各个可能的设计所描述的方法。接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置。可以理解的是，接口电路可以为收发器或输入输出接口。
可选的，通信装置还可以包括存储器，用于存储处理器执行的指令或存储处理器运行指令所需要的输入数据或存储处理器运行指令后产生的数据。所述存储器可以是物理上独立的单元，也可以与所述处理器耦合，或者所述处理器包括所述存储器。
结合第五方面，在一个可能的设计中，处理器用于确定LTF序列，该LTF序列记为第一LTF序列，其中，第一LTF序列为信道带宽对应的LTF总序列中与第一RU对应的序列段，信道带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，该连续的M个第一子载波与该M个分量具有对应关系。接口电路，用于在离散RU上向AP发送第一LTF序列，其中，离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别在该不连续的M个第二子载波上发送。
在一个可能的设计中，接口电路，还用于接收来自AP的触发帧，触发帧用于指示信 道带宽、以及分配给该STA的第一RU。可选的，所述通信模块从AP接收的触发帧还用于指示用于发送第一LTF序列的子载波是不连续的。
在一个可能的设计中，离散RU所跨占的带宽为第一带宽，STA在第一带宽上除该M个第二子载波之外的子载波上不发送信号。
在一个可能的设计中，所述第一LTF序列用于所述AP进行信道估计。
第五方面以及各个可能的设计的有益效果可以参考第一方面对应部分的描述。
第六方面，本申请实施例提供一种通信装置，该通信装置包括接口电路和处理器，处理器和接口电路之间相互耦合。处理器通过逻辑电路或执行代码指令用于实现上述第二方面、第二方面各个可能的设计所描述的方法。接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置。可以理解的是，接口电路可以为收发器或输入输出接口。
可选的，通信装置还可以包括存储器，用于存储处理器执行的指令或存储处理器运行指令所需要的输入数据或存储处理器运行指令后产生的数据。所述存储器可以是物理上独立的单元，也可以与所述处理器耦合，或者所述处理器包括所述存储器。
结合第六方面，在一个可能的设计中，接口电路用于在离散RU上的接收来自STA的信号；处理器用于根据第一LTF序列，对在离散RU上接收的信号进行信道估计，其中，第一LTF序列为信道总带宽对应的LTF总序列中与第一资源单元RU对应的序列段，信道总带宽中的N个子载波与LTF总序列的N个分量一一对应，第一RU为N个子载波中连续的M个第一子载波，第一LTF序列为N个分量中的M个分量，该连续的M个第一子载波与该M个分量具有对应关系；离散RU包括不连续的M个第二子载波，第一LTF序列的M个分量分别用于对该M个第二子载波上的接收信号进行信道估计。
在一个可能的设计中，通信模块还用于向STA发送触发帧，触发帧用于指示信道带宽、以及分配给STA的第一RU。
可选的，触发帧还用于指示发送所述第一LTF序列的子载波是不连续的。
第六方面以及各个可能的设计的有益效果可以参考第二方面对应部分的描述。
第七方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有计算机程序或可读指令，当所述计算机序或可读指令被通信装置执行时，使得如上述各方面或各方面各个可能的设计中所述的方法被执行。
第八方面，本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器。存储器用于存储程序、指令或代码；处理器用于执行存储器存储的程序、指令或代码，以实现上述各方面或各方面各个可能的设计中所述的方法。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
第九方面，提供了一种包含指令的计算机程序产品，当其被通信装置执行时，使得如第各方面或各方面各个可能的设计中所述的方法被执行。
附图说明
图1为本申请实施例中WLAN系统架构示意图之一；
图2为本申请实施例中WLAN系统架构示意图之二；
图3为本申请实施例中长训练字段序列的传输方法流程示意图；
图4为本申请实施例中80MHz的子载波分布及RU分布示意图；
图5为本申请实施例中26-tone RU的LTF序列生成的示意图之一；
图6为本申请实施例中26-tone RU的LTF序列生成的示意图之二；
图7为本申请实施例中通信装置结构示意图之一；
图8为本申请实施例中通信装置结构示意图之二。
具体实施方式
本申请提供一种长训练字段序列的传输方法，以期解决在离散的RU上发送LTF序列的问题。其中，方法和装置是基于相同或相似技术构思的，由于方法及装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。
本申请提供的长训练字段序列的传输方法可以适用于无线局域网(wireless local area network，WLAN)系统，可以适用于IEEE 802.11系统标准，例如802.11a/b/g、802.11n、802.11ac、802.11ax，或其下一代，例如802.11be或更下一代的标准中。其中802.11n也可称为高吞吐率(high throughput,HT)；802.11ac也可称为非常高吞吐率(very high throughput，VHT)；802.11ax也可称为高效(high efficient，HE)或者Wi-Fi 6；802.11be也可称为极高吞吐率(extremely high throughput，EHT)或者(Wi-Fi 7)，而对于HT之前的标准，如802.11a/b/g等统称叫做非高吞吐率(Non-HT)。本申请提供的方法也可适用于包括但不限于物联网(internet of things，IoT)网络或车联网(Vehicle to X，V2X)网络等无线局域网系统中。下文以本申请实施例可以适用于WLAN的场景为例。
下面将结合附图，对本申请实施例进行详细描述。
本申请实施例可以适用的一种WLAN系统100可以包括：一个或多个AP，一个或多个站点(station，STA)。
图1以一个AP101和两个STA为示例，两个STA用STA102-1和STA102-1表示。AP101与STA102-1和STA102-1关联。与AP关联的STA，能够接收该AP发送的无线帧，也能够向该AP发送无线帧。另外，本申请实施例同样适用于AP与AP之间的通信，例如各个AP之间可通过分布式系统(distributed system，DS)相互通信，本申请实施例也适用于STA与STA之间的通信。
如图2所示，WLAN系统100中也可以包括多个AP。图2显示了两个AP，以每个AP连接两个STA为例进行示例。可以理解WLAN系统中还可以包括更多个AP和更多个STA。
两个AP分别为AP101-1和AP101-2，AP101-1连接两个STA，用STA102-1和STA102-2表示。AP101-2连接两个STA，用STA102-3和STA102-4表示。
以下对本申请实施例设计的AP和STA进行说明。
AP，也可称之为无线访问接入点或桥接器或热点。AP可以接入服务器或通信网络。AP本身也是一个站点。AP是一种部署在无线通信网络或WLAN网络中为其关联的站点提供无线通信功能的装置，AP可用作WLAN系统的中枢。AP可以为基站、路由器、网关、中继器、通信服务器、交换机或网桥等。其中，基站可以包括各种形式的宏基站，微基站，中继站等。在此，为了描述方便，本申请实施例中将上面提到的设备统称为AP。
STA，可以是各种具有无线通信功能的用户终端、用户装置，接入装置，订户站，订户单元，移动站，用户代理，用户装备或其他名称，其中，用户终端可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其 它处理设备,以及各种形式的用户设备(user equipment,UE),移动台(mobile station,MS)，终端(terminal)，终端设备(terminal equipment)，便携式通信设备，手持机，便携式计算设备，娱乐设备，游戏设备或系统，全球定位系统设备或被配置为经由无线介质进行网络通信的任何其他合适的设备等。在此，为了描述方便，本申请实施例中将上面提到的设备统称为STA。
图1和图2中涉及的AP/STA，可以由一个设备实现，也可以由多个设备共同实现，还可以是一个设备内的一个功能模块，本申请实施例对此不作具体限定。可以理解的是，上述功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。
此外，本申请实施例提供的技术方案可适用于多种系统架构。本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
近期，美国联邦通信委员会定义了一种室内低功耗(low power indoor,LPI)的通信方式，对发送的最大功率和最大频率谱密度进行了严格的限制，对于AP，最大功率是36分贝毫瓦(decibel-milliwatts，dBm)，最大功率谱密度为5分贝毫瓦/兆赫兹(decibel-milliwatts/megahertz，dBm/MHz)；对于STA，最大功率是24dBm，最大功率谱密度为-1dBm/MHz。设备发送的功率同时受最大功率和最大功率谱密度的限制，即设备发送的功率不能超过最大功率值，也不能超过最大功率谱密度，即每MHz的发送功率不能超过给定值。
基于此，分布式资源单元(resource unit，RU)的方法被提出。分布式RU也可以称为离散RU或其他名称，本申请实施例中以离散RU为例进行说明。将频域上的连续RU的子载波映射到离散的子载波上，由于RU在频域上变得离散而拓宽了发送带宽。在最大功率谱密度的限制下，发送带宽被拓宽，也就意味着能够获得更大的发送带宽。
以下对连续RU和离散RU的概念进行解释说明。
连续RU，由连续的多个子载波组成的RU，或者连续RU是由两组连续子载波组组成的RU，每组连续子载波组包括的多个子载波是连续的，两组子载波组之间仅被保护子载波、空子载波、或者直流子载波中的一种或多种间隔。802.11ax中支持的RU均可理解为连续RU。连续RU又可称作常规RU。当然，连续RU也可以为其他名称，本申请实施例对连续RU的具体名称不作限定。
相对连续RU而言，包括多个在频域上离散的子载波的RU可称为离散RU，即离散RU包括多个子载波，并且任意两个子载波在频域上离散。离散RU也可以包括多个在频域上离散的子载波组，其中，一个子载波组包括一个或多个子载波。一个子载波组包括的多个子载波为多个连续的子载波。
在上行传输中，STA会向AP发送参考序列，参考序列用于AP进行信道估计。参考序列例如可以是LTF序列，LTF序列可以是超高吞吐率长训练字段(extremely high throughput long training field，EHT-LTF)序列，也可以是其他用于信道估计的序列。本申请实施例中以用于信道估计的序列为LTF序列为例进行介绍。
如果STA在离散RU传输数据，那么STA会在离散RU上发送LTF序列。以下对在离散RU上发送LTF序列的方法进行说明。
本申请实施例中，信道带宽为传输总带宽，802.11ax目前支持如下信道带宽配置包括：20MHz、40MHz、80MHz、160MHz及80+80MHz。其中，160MHz与80+80MHz的区别在于前者为连续频带，而后者的两个80MHz间可以分离。在802.11be中，支持320MHz。不同的信道带宽可以对应LTF序列，为方便理解，本申请中将信道带宽对应的LTF序列称为LTF总序列。一个信道带宽对应一个LTF总序列。信道带宽包括连续的多个子载波，子载波具有对应的序号，例如80MHz的信道带宽可以包括序号为-500至500的子载波。LTF总序列的长度可以与信道带宽包含的子载波数量相同，这样LTF总序列的分量与信道带宽的子载波序号具有一一对应的关系。例如，信道带宽中包括N个子载波，N个子载波与LTF总序列的N个分量一一对应。
AP为STA分配的RU资源，该RU资源为连续RU的资源，STA在离散RU与AP进行通信时，需要将连续RU的资源离散开，得到离散RU。如何将连续RU的资源在频域上进行离散以得到离散RU，本申请不作限制。例如，可以设置连续RU与离散RU的对应关系，根据该对应关系，将连续RU离散为离散RU。
在离散RU上发送LTF序列的方法的一个实施例A中，根据信道带宽对应的LTF总序列，确定离散RU的各个子载波分别对应的分量，并在离散RU的各个子载波上分别发送对应的分量，从而实现在离散RU上发送LTF序列。但是这种方案得到的峰值平均功率比(peak to average power ratio,PAPR)比较高，信道估计的性能较低。
本申请实施例提供一种基于LTF序列的通信方法，能够降低在离散RU上发送LTF序列的PAPR，提高信道估计的性能。
如图3所示，下面对本申请实施例的长训练字段序列的传输方法进行说明。
S301.站点STA确定第一LTF序列。
其中，信道带宽中包括N个子载波，N个子载波与LTF总序列的N个分量一一对应，信道带宽包括第一RU，第一RU为N个子载波中连续的M个子载波，为便于描述，第一RU包括的M个子载波可以记为M个第一子载波。
第一LTF序列为信道带宽对应的LTF总序列中与第一RU对应的序列段，连续的M个第一子载波与M个分量具有对应关系。即，第一LTF序列为M个第一子载波对应的M个分量组成的序列。
S302.STA在离散RU上向AP发送第一LTF序列。
离散RU是上述N个子载波中的不连续的M个子载波，离散RU包括的M个子载波可以记为M个第二子载波。在离散RU上发送第一LTF序列，即为第一LTF序列的M个分量分别在M个第二子载波上发送。可以理解的是，STA确定与第一RU具有对应关系的离散RU，或者说STA将与第一RU对应的第一LTF序列，映射到离散的RU上发送，该离散的RU与第一RU之间具有对应关系。
可选的，第一RU与离散RU的对应关系可以是预先定义的，也可以是AP通知给STA的。
S303.AP确定第一LTF序列。
AP已知为STA分配的第一RU以及信道带宽对应的LTF总序列，AP即可以确定信道带宽对应的LTF总序列中与第一RU对应的序列段，即第一LTF序列。
S304.AP根据第一LTF序列，对在离散RU上的接收信号进行信道估计。
其中，第一LTF序列的M个分量分别用于对M个第二子载波上的接收信号进行信道 估计。
可选的，AP可以根据第一RU与离散RU的对应关系，确定离散RU。AP可以与STA采用相同的方式确定离散RU。具体STA与AP确定离散RU的方法本申请实施例不作限定。
STA在M个第二子载波上发送第一LTF序列的M个分量，AP在M个第二子载波上分别接收M个参考信号，参考信号即S304中的接收信号。该M个参考信号是第一LTF序列的M个分量经过信道噪声干扰后的信号。AP根据预先已知的第一LTF序列的M个分量以及接收的M个参考信号，可以对M个第二子载波分别进行信道估计，获得M个第二子载波的信道估计结果。STA可以在M个第二子载波上发送数据，该数据可以分为M个数据分量，M个数据分量分别在M个第二子载波上发送，AP在M个第二子载波上分别接收M个数据分量。AP根据M个第二子载波的信道估计结果，就可以对M个数据分量进行解析，获得正确的解析结果。
可以理解的是，AP可能会为多个STA分配RU资源，也会接收多个STA的信号，多个STA中的每个STA相关的方案均可以参考本申请实施例中所描述的STA的方案。
通过图3实施例提供的方法，在离散RU上发送连续RU对应的LTF序列，这样能够降低PAPR，从而提高信道估计的性能。
以下对图3实施例的一些可选的实现方式进行说明。
在S301之前还可以包括S300。
S300.AP向STA发送触发帧(trigger frame)，对应地，STA接收来自AP的触发帧。
该触发帧用于指示信道带宽，以及分配给STA的第一RU。
可以理解的是，在AP下有多个STA时，AP会向多个STA发送触发帧，在向每个STA发送的触发帧里携带分配给该STA的RU的指示信息。例如，802.11ax和802.11be的多用户传输是基于正交频分多址(orthogonal frequency division multiple access,OFDMA)技术，以达成高密场景下提升系统平均吞吐量的目标，其中，用户是根据RU区分出来的，在该模式下，用户的数据是承载在每一个RU上的，故从总的时频资源上来看，每一个时间片上，有可能有多个用户同时发送。在上行传输(uplink-OFDMA,UL-OFDMA)或者下行传输(downlink-OFDMA,DL-OFDMA)的过程中，都需要利用触发帧来实现多用户通信间以及调度信息的交换。AP向STA发送的触发帧中可以包括信道带宽以及RU资源的分配信息。
STA根据接收的触发帧指示的信道带宽，可以确定该信道带宽对应的LTF总序列。STA根据接收的触发帧指示的RU资源的分配信息，可以确定AP分配给该STA的第一RU。
可选的，AP向STA发送的触发帧还可以用于指示第一LTF序列的子载波是不连续的，或者说该触发帧还可以指示AP在不连续的子载波上发送第一LTF序列。STA根据触发帧的指示，将连续RU(即第一RU)在频域上进行离散，得到离散RU。
以下介绍一下离散RU与信道带宽的关系。信道带宽也可以称为载波带宽。离散RU所跨占的带宽记为第一带宽，信道带宽包括第一带宽。离散RU所跨占的带宽可以理解为离散RU的第一个子载波到最后一个子载波所跨占的带宽。S302中STA在离散RU上向AP发送第一LTF序列，可选的，STA在第一带宽上的离散的M个第二子载波上发送第一LTF序列，在第一带宽上除M个第二子载波之外的其它子载波上不发送信号。可以理解的是，在多用户传输场景下，在一个STA不发送信号的子载波上可能会有其它STA发送信 号。
以下以信道带宽为80MHz为例，对本申请实施例提供的方法做进一步说明。
在本申请实施例中，包括K个子载波的RU可以称为K-tone RU。如图4所示，以信道带宽为80MHz为例，整个带宽可以由整个996-tone RU组成，也可以由两个484-tone RU组成，也可以由4个242-tone RU组成，也可以由26-tone RU、52-tone RU或106-tone RU等各种组合组成。图4的最左边的竖线对应于信道带宽的最低频率，图4的最右边的竖线对应于信道带宽的最高频率。其中，484L，484R代表484-tone RU的左半部分和右半部分，分别包含242个子载波，是484+5直流子载波(direct current，DC)的另外一种示意方式。其中5DC表示整个信道带宽中的5个子载波，这5个子载波容易受到设备自身直流信号干扰，一般不用于传输数据。从左到右，可以对26-tone RU进行标号：1 st,2 nd,…,36 th。同样地，可以对52-tone RU进行标号：1 st,2 nd,…,16 th；对106-tone RU进行标号：1 st,2 nd,…,8 th；对242-tone RU进行标号：1 st,2 nd,3 rd,4 th；对484-tone RU进行标号：1 st,2 nd。
连续RU在被离散后得到离散RU，在一种可能的离散方式下，将连续RU的子载波映射到离散的子载波上生成离散RU后，离散RU相邻子载波间隔距离可以如下：26-tone RU中相邻子载波间距离为19，即在两个子载波之间插入18个0；52-tone RU中相邻子载波间距离为10，即在两个子载波之间插入9个0；106-tone RU中相邻子载波间距离为5，即在两个子载波之间插入4个0；2422-tone RU中相邻子载波间距离为2，即在两个子载波之间插入1个0；484-tone RU中相邻子载波间距离为2，即在两个子载波之间插入1个0。在两个第二子载波之间插入0，插入0即不发送信号，不发送信号的子载波可以称为“空”子载波。
举例来说，AP分配给STA的第一RU为第3 rd个连续的26-tone RU。如图5所示，示出了连续RU到离散RU的关系，以及离散RU上映射第一LTF的方式。80MHz的信道带宽包括的子载波数量N为1001，N个子载波的序号分别为[–500:+500]。第x个连续的26-tone RU，被离散后的离散RU的位置为[(-500+k-1):13:(-175+k-1)]。例如，第1 st个连续的26-tone RU，被离散后的离散RU的位置为[-500:13:-175]，即-500-487-474-461-448-435-422-409-396-383-370-357-344-331-318-305-292-279-266-253-240-227-214-201-188-175。第一RU为连续RU，第一RU包括连续的26个子载波，例如，第一RU包括序号为[–445:–420]的子载波。对应地，LTF总序列包括1001个分量，分量下标也可以用[–500:–500]表示，下标为[–500:–500]的分量分别与序号为[–500:–500]的子载波一一对应。第一LTF序列为下标为[–445:–420]的M个分量组成的序列。离散RU为第一RU在频域上离散开的RU，例如离散RU可以包括序号为[(-500+3-1):13:(-175+3-1)]的26个子载波，即离散RU的26个子载波序号为-498-485-472-459-446-433-420-407-394-381-368-355-342-329-316-303-290-277-264-251-238-225-212-199-186-173。在序号为[(-500+3-1):13:(-175+3-1)]的26个子载波上分别发送下标为[–445:–420]的26个分量。
上文还提供了在离散RU上发送LTF序列的方法的一个实施例A，根据信道带宽对应的LTF总序列，确定离散RU的各个子载波分别对应的分量，并在离散RU的各个子载波上分别发送对应的分量，从而实现在离散RU上发送LTF序列。基于实施例A，对比图5所示的实施例的方式，如图6所示，AP分配给STA的连续RU包括序号为[–445:–420]的子载波，连续RU在频域上离散为离散RU，离散RU包括序号为[(-500+3-1):13:(-175+3-1)] 的26个子载波，在离散RU上发送第二LTF序列，第二LTF序列的26个分量的下标与离散RU的26个子载波的序号一一对应。第二LTF序列为LTF总序列中下标为[(-500+3-1):13:(-175+3-1)]的分量组成的序列。
相比于图6实施例，图5实施例能够获得更低的PAPR。表1示出了图3实施例的方法和实施例A的方法，在带宽为80MHz下LTF序列的PAPR对比。
表1
Figure PCTCN2022111158-appb-000001
需要说明的是，本申请中的各个应用场景中的举例仅仅表现了一些可能的实现方式，是为了对本申请的方法更好的理解和说明。本领域技术人员可以根据申请提供的参考信号的指示方法，得到一些演变形式的举例。
上述本申请提供的实施例中，分别从AP、STA以及STA和AP之间交互的角度对本申请实施例提供的方法进行了介绍。为了实现上述本申请实施例提供的方法中的各功能，STA和AP可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
如图7所示，基于同一技术构思，本申请实施例还提供了一种通信装置700，该通信装置700可以是STA或AP，也可以是STA或AP中的装置，或者是能够和STA或AP匹配使用的装置。一种设计中，该通信装置700可以包括执行上述方法实施例中STA或AP执行的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该通信装置可以包括处理模块701和通信模块702。处理模块701用于调用通信模块702执行接收和/或发送的功能。
当用于执行STA执行的方法时：处理模块701用于确定第一LTF序列，通信模块702用于在离散RU上向AP发送第一LTF序列。
当用于执行AP执行的方法时：通信模块702用于在离散RU上的接收来自STA的信号，处理模块701用于根据所述第一LTF序列，对在离散RU上接收的所述信号进行信道估计。有关上述处理模块701和通信模块702更详细的描述可以直接参考图3所示的方法实施例中相关描述直接得到，这里不加赘述。
如图8所示为本申请实施例提供的通信装置800，用于实现上述方法中STA或AP的功能。当实现STA的功能时，该通信装置可以是STA，也可以是STA中的装置,或者是能够和STA匹配使用的装置。当实现AP的功能时，该装置可以是AP，也可以是AP中的装置,或者是能够和AP匹配使用的装置。其中，该通信装置可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。如图8所示，通信装置800包括处理器810和接口电路820。处理器810和接口电路820之间相互耦合。可以理解的是，接口电路820可以为收发器或输入输出接口。可选的，通信装置800还可以包括存储器830，用于存储处理器810执行的指令或存储处理器810运行指令所需要的输入 数据或存储处理器810运行指令后产生的数据。
当通信装置800用于实现图3所示的方法时，处理器810用于实现上述处理模块701的功能，接口电路820用于实现上述通信模块702的功能。
通信装置700和通信装置800具体是芯片或者芯片系统时，通信模块702和接口电路820所输出或接收的可以是基带信号。通信装置700和通信装置800具体是设备时，通信模块702和接口电路820所输出或接收的可以是射频信号。在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
可以理解的是，本申请的实施例中的处理器可以是中央处理单元(Central Processing Unit，CPU)，还可以是其它通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其它可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。通用处理器可以是微处理器，也可以是任何常规的处理器。
在本申请实施例中，存储器830可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
本申请上述方法实施例描述的STA所执行的操作和功能中的部分或全部，或AP所执行的操作和功能中的部分或全部，可以用芯片或集成电路来完成。
为了实现上述图7或图8所述的通信装置的功能，本申请实施例还提供一种芯片，包括处理器，用于支持该通信装置实现上述方法实施例中STA或AP所涉及的功能。在一种可能的设计中，该芯片与存储器连接或者该芯片包括存储器，该存储器用于保存该通信装置必要的程序指令和数据。
本申请实施例提供了一种计算机可读存储介质，存储有计算机程序，该计算机程序包括用于执行上述方法实施例的指令。
本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得上述方法实施例被执行。
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A,B可以是单数或者复数。
可以理解的是，在本申请的实施例中涉及的各种数字编号仅为描述方便进行的区分，并不用来限制本申请的实施例的范围。上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实 施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请实施例的精神和范围。这样，倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (22)

  1. 一种长训练字段序列的传输方法，其特征在于，包括：
    站点STA确定第一长训练字段LTF序列，其中，所述第一LTF序列为信道带宽对应的LTF总序列中与第一资源单元RU对应的序列段，所述信道带宽中的N个子载波与所述LTF总序列的N个分量一一对应，所述第一RU为所述N个子载波中连续的M个第一子载波，所述第一LTF序列为所述N个分量中的M个分量，所述连续的M个第一子载波与所述M个分量具有对应关系；
    所述STA在离散RU上向接入点AP发送所述第一LTF序列，其中，所述离散RU包括不连续的M个第二子载波，所述第一LTF序列的M个分量分别在所述不连续的M个第二子载波上发送。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    所述STA接收来自所述AP的触发帧，所述触发帧用于指示所述信道带宽、以及分配给所述STA的所述第一RU。
  3. 如权利要求2所述的方法，其特征在于，所述触发帧还用于指示用于发送所述第一LTF序列的子载波是不连续的。
  4. 如权利要求1～3中任一项所述的方法，其特征在于，所述离散RU所跨占的带宽为第一带宽，所述STA在所述第一带宽上除所述M个第二子载波之外的子载波上不发送信号。
  5. 如权利要求1～4中任一项所述的方法，其特征在于，所述第一LTF序列用于所述AP进行信道估计。
  6. 一种长训练字段序列的传输方法，其特征在于，包括：
    接入点AP在离散RU上的接收来自STA的信号；
    所述AP根据所述第一LTF序列，对在离散RU上接收的所述信号进行信道估计，其中，所述第一LTF序列为信道总带宽对应列中与第一资源单元RU对应的序列段，所述信道总带宽中的N个子载波与所述的N个分量一一对应，所述第一RU为所述N个子载波中连续的M个第一子载波，所述第一LTF序列为所述N个分量中的M个分量，所述连续的M个第一子载波与所述M个分量具有对应关系；所述离散RU包括不连续的M个第二子载波，所述第一LTF序列的M个分量分别用于对所述M个第二子载波上的接收信号进行信道估计。
  7. 如权利要求6所述的方法，其特征在于，所述方法还包括：
    所述AP向所述STA发送触发帧，所述触发帧用于指示所述信道带宽、以及分配给所述STA的所述第一RU。
  8. 如权利要求7所述的方法，其特征在于，所述触发帧还用于指示发送所述第一LTF序列的子载波是不连续的。
  9. 一种通信装置，其特征在于，包括：
    处理模块，所述处理模块用于：确定第一长训练字段LTF序列，其中，所述第一LTF序列为信道带宽对应的LTF总序列中与第一资源单元RU对应的序列段，所述信道带宽中的N个子载波与所述LTF总序列的N个分量一一对应，所述第一RU为所述N个子载波中连续的M个第一子载波，所述第一LTF序列为所述N个分量中的M个分量，所述连续 的M个第一子载波与所述M个分量具有对应关系；
    通信模块，所述通信模块用于：在离散RU上向接入点AP发送所述第一LTF序列，其中，所述离散RU包括不连续的M个第二子载波，所述第一LTF序列的M个分量分别在所述不连续的M个第二子载波上发送。
  10. 如权利要求9所述的装置，其特征在于，所述通信模块还用于：
    接收来自所述AP的触发帧，所述触发帧用于指示所述信道带宽、以及分配给站点STA的所述第一RU。
  11. 如权利要求10所述的装置，其特征在于，所述触发帧还用于指示用于发送所述第一LTF序列的子载波是不连续的。
  12. 如权利要求9-11中任一项所述的装置，其特征在于，所述离散RU所跨占的带宽为第一带宽，所述STA在所述第一带宽上除所述M个第二子载波之外的子载波上不发送信号。
  13. 如权利要求9～12中任一项所述的装置，其特征在于，所述第一LTF序列用于所述AP进行信道估计。
  14. 一种长训练字段序列的传输装置，其特征在于，包括：
    通信模块，所述通信模块用于：在离散RU上的接收来自STA的信号；
    处理模块，所述处理模块用于：根据所述第一LTF序列，对在离散RU上接收的所述信号进行信道估计，其中，所述第一LTF序列为信道总带宽对应列中与第一资源单元RU对应的序列段，所述信道总带宽中的N个子载波与所述的N个分量一一对应，所述第一RU为所述N个子载波中连续的M个第一子载波，所述第一LTF序列为所述N个分量中的M个分量，所述连续的M个第一子载波与所述M个分量具有对应关系；所述离散RU包括不连续的M个第二子载波，所述第一LTF序列的M个分量分别用于对所述M个第二子载波上的接收信号进行信道估计。
  15. 如权利要求14所述的装置，其特征在于，所述通信模块还用于：
    向所述STA发送触发帧，所述触发帧用于指示所述信道带宽、以及分配给所述STA的所述第一RU。
  16. 如权利要求15所述的装置，其特征在于，所述触发帧还用于指示发送所述第一LTF序列的子载波是不连续的。
  17. 一种通信装置，其特征在于，包括用于执行如权利要求1～5中的任一项所述方法的模块或包括用于执行如权利要求6～8中的任一项所述方法的模块。
  18. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1～5中任一项所述的方法或实现如权利要求6～8中任一项所述的方法。
  19. 一种计算机可读存储介质，其特征在于，所述计算机存储介质中存储有计算机可读指令，当所述计算机可读指令在通信装置上运行时，使得如权利要求1～5中任一项所述的方法被实现或使得如权利要求6～8中任一项所述的方法被实现。
  20. 一种计算机程序产品，其特征在于，所述计算机程序产品包括指令，当所述计算机可读指令在通信装置上运行时，使得如权利要求1～5中任一项所述的方法被实现或使得如权利要求6～8中任一项所述的方法被实现。
  21. 一种芯片，其特征在于，所述芯片与存储器耦合，用于读取并执行所述存储器中存储的程序指令，以执行如权利要求1～5中任一所述的方法或执行如权利要求6～8中任一所述的方法。
  22. 一种通信系统，其特征在于，所述系统包括用于执行如权利要求1～5中的任一项所述方法的装置和用于执行如权利要求6～8中的任一项所述方法的装置。
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