WO2016206652A2 - Procédé et système d'émission de signal sans fil - Google Patents

Procédé et système d'émission de signal sans fil Download PDF

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Publication number
WO2016206652A2
WO2016206652A2 PCT/CN2016/096273 CN2016096273W WO2016206652A2 WO 2016206652 A2 WO2016206652 A2 WO 2016206652A2 CN 2016096273 W CN2016096273 W CN 2016096273W WO 2016206652 A2 WO2016206652 A2 WO 2016206652A2
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WIPO (PCT)
Prior art keywords
frame
signal
type
format
training
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PCT/CN2016/096273
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English (en)
Chinese (zh)
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WO2016206652A3 (fr
Inventor
邢卫民
吕开颖
田开波
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中兴通讯股份有限公司
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Priority claimed from CN201510561510.0A external-priority patent/CN106304357B/zh
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US15/737,854 priority Critical patent/US10432348B2/en
Priority to EP16813768.5A priority patent/EP3316506B1/fr
Publication of WO2016206652A2 publication Critical patent/WO2016206652A2/fr
Publication of WO2016206652A3 publication Critical patent/WO2016206652A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and system for transmitting a wireless signal.
  • WLAN wireless local area network
  • the parallel multi-user data transmission technology currently studied by the 11ax group includes multi-user multiple-input multiple-output (MU-MIMO) technology (space-based multiple access), orthogonal frequency division multiple access (OFDMA). Orthogonal Frequency Division Multiple Access (OFDM) and Interleaved-Division Multiple Access (IDMA) (code-domain multiple access).
  • MU-MIMO multi-user multiple-input multiple-output
  • OFDMA orthogonal frequency division multiple access
  • OFDM Orthogonal Frequency Division Multiple Access
  • IDMA Interleaved-Division Multiple Access
  • FIG. 1 is an exemplary diagram of a WLAN Basic Service Set (BSS).
  • BSS WLAN Basic Service Set
  • an access point site AP, Access Point
  • non-AP STAs non-AP STAs
  • Parallel multi-user data transmission in WLAN generally refers to multiple secondary nodes transmitting data to the primary node at the same time, called uplink multi-user (UL MU, Uplink Multi-User), or the primary node simultaneously sends data to multiple secondary nodes. It is called Downlink Multi-User (DL MU, Downlink Multi-User).
  • UL MU uplink multi-user
  • DL MU Downlink Multi-User
  • the primary node is an AP or a non-AP STA with special capabilities
  • the secondary node is a general non-AP STA.
  • the WLAN radio frame In a WLAN system, data transmission is generally random access, and there is no strict synchronization relationship. Therefore, in order for the receiver to smoothly detect and receive data in the radio frame, the WLAN radio frame generally includes a physical layer header and a data payload.
  • the physical layer header portion further includes a training sequence and a physical layer header signaling, as shown in FIG. 2 .
  • the training sequence is used by the receiving side to detect the start of the radio frame, and performs operations such as synchronization, gain control, channel estimation, etc., to assist the reception of the physical layer frame header signaling and the data load, and the physical layer header signaling portion generally adopts a fixed format.
  • the physical layer header is a combination of training and signaling domains designed to aid in receiving data payloads.
  • 802.11a/g uses Orthogonal Frequency Division Multiplexing (OFDM) technology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • 802.11n introduces MIMO and 40MHz bandwidth.
  • the format of the radio frame has been modified to accommodate these changes. It is currently called the high-throughput format (HT format).
  • 802.11ac introduces technologies such as higher-order MIMO, larger bandwidth, and DL MU-MIMO.
  • VHT very high-throughput format
  • HE high-efficiency format
  • the WLAN radio frame format is constantly evolving and has the following features: (1) Backward compatibility, WLAN devices can decode frame formats defined by standards that are supported by themselves. For example, VHT stations can send and receive VHT, HT, Non-HT format frames, but non-HT sites cannot send and receive frames in HT or VHT format; (2) The frame format is constantly evolving, but the basic structure of the frame still includes the physical layer header and data payload.
  • the physical layer header is a training sequence designed to assist in receiving data payloads immediately following the physical layer header.
  • FIG. 3 is a schematic diagram of an uplink multi-user transmission process in the prior art.
  • the UL MU transmission process starts from the trigger frame that the AP sends the scheduling and signaling indication, and the uplink multi-user transmits according to the content of the trigger frame, thereby solving the interference and synchronization problem between the uplink multiple users.
  • the scheduling and signaling indications included in the trigger frame specifically indicate the length of the data sent by the station, the sending parameters, and the resource location sent by the uplink.
  • the traditional frame format non-HT format or the traditional modulation and coding mode is used to transmit the trigger frame to ensure the traditional device and other accessory devices. It is also possible to parse the reservation information in the trigger frame.
  • the triggering frame of the traditional format has the following problems: (1) If the uplink multi-user data transmission uses the new frame format HE format, in order to ensure synchronization, the uplink multi-user needs to measure the trigger frame, and send the uplink HE according to the measurement result. Formatted multi-user radio frame, but if the trigger frame uses the traditional format instead of the HE format, the training signal carried by the traditional format is designed to receive the data load of the traditional frame format, which can ensure the reception of the trigger frame but is insufficient to satisfy The training precision required by the user transmission, as shown in FIG. 3, the trigger frame of the traditional frame format only carries the traditional training signal.
  • the uplink multi-user receives the trigger frame, and needs to perform uplink transmission immediately after the specific interframe space (IFS, interframe space), possibly There is not enough time for data preparation, as shown in Figure 3, at short interframe spacing (SIFS, short interf After rame space), STA1 to STA4 may not be able to prepare uplink multi-user radio frames.
  • IFS interframe space
  • SIFS short interframe spacing
  • an embodiment of the present invention provides a method and system for transmitting a wireless signal, which is used to solve the problem that the trigger frame cannot satisfy the uplink multi-user transmission while completing the transmission resource reservation and triggering multi-user transmission in the prior art.
  • the required training accuracy and can not guarantee that the site has enough time to prepare for the uplink data after receiving the trigger frame.
  • an embodiment of the present invention provides a method for transmitting a wireless signal, including: a transmitting station transmitting a wireless signal to one or more receiving stations, where the wireless signal includes a first part and a second part, The first part is an independently decodable trigger frame of a first type of frame format, and the second part is a specific signal of a second type of frame format; the transmitting station receives at least one of the plurality of receiving sites The radio frame sent.
  • the trigger frame includes a physical layer frame header and a data payload of a first type of frame format, where a physical layer frame header of the first type of frame format is used to assist a receiving station to receive data of the first type of frame format.
  • the data payload of the first type of frame format is used to trigger the receiving station to send a radio frame to the sending station; the specific signal of the second type of frame format is used to assist the receiving station to prepare to be sent to the The radio frame of the sending site.
  • the first type of frame format includes a non-high throughput non-HT format or a same modulation coding mode as the non-HT format; and the second type of frame format includes a high efficiency HE format.
  • the specific signal of the second type of frame format is a training signal or an extended signal or a supplementary signal of a second type of frame format
  • the training signal includes one or more training sequences
  • the training signal or the extension There is no interframe space between the signal or the supplemental signal and the trigger frame.
  • the specific signal of the second type of frame format is a null data packet NDP including a training signal or an extended signal of a second type of frame format, where the training signal includes one or more training sequences;
  • the interval of the trigger frame is the short interframe space SIFS.
  • the physical layer frame header of the trigger frame includes indication information of a sending duration of the trigger frame.
  • the medium access control MAC layer frame header of the trigger frame includes a transmission duration of a specific signal of the second type of frame format, and a time of one or more radio frames sent by the receiving station. Long, the duration of one or more response frames sent by the transmitting station, and indication information of the duration of the interframe spacing therein.
  • the MAC layer frame header of the trigger frame includes indication information of a frame type and/or a subframe type, where the frame type and/or the subframe type is used to indicate that the trigger frame is used to trigger the multiple receiving
  • the station transmits a radio frame, and the trigger frame is followed by a specific signal of the second type of frame format.
  • condition for determining the specific signal of the second type of frame format after the trigger frame comprises: the frame type of the trigger frame, the indication information or the sequence in the trigger frame implicitly indicating the trigger frame There is a specific signal of the second type of frame format; the indication information or sequence in the trigger frame further implicitly indicates that the specific signal includes at least one of the following information: length, format.
  • the trigger frame includes at least one of the following indication information of the training signal of the second type of frame format:
  • the indication information of the transmission parameter of the training signal of the second type of frame format is the indication information of the transmission parameter of the training signal of the second type of frame format.
  • the present invention also provides a method for transmitting a wireless signal, comprising: a plurality of receiving stations receiving a wireless signal transmitted by a transmitting station, wherein the wireless signal includes a first part and a second part, and the first part is a first type of frame a formatted independently decodable trigger frame, the second portion being a specific signal of a second type of frame format; at least one of the plurality of receiving stations transmitting a radio frame to the transmitting station according to the received wireless signal.
  • the first type of frame format includes a non-high throughput non-HT format or a same modulation coding mode as the non-HT format; and the second type of frame format includes a high efficiency HE format.
  • the specific signal of the second type of frame format is:
  • the training signal includes one or more training sequences; there is no interframe space between the training signal or the extended signal and the trigger frame; or
  • null packet NDP containing a training signal of the second type of frame format or an extended signal
  • the training The signal includes one or more training sequences; the interval between the NDP and the trigger frame is a short interframe space SIFS.
  • transmitting, by the at least one of the multiple receiving stations, the radio frame to the sending station according to the received wireless signal includes: the receiving station measuring one or more of the training signals of the second type of frame format Training sequences and estimate one of the following:
  • the adjustment parameter includes at least one of the following: a frequency offset adjustment amount, a transmission power adjustment amount, and a transmission delay adjustment amount.
  • the sending by the at least one of the multiple receiving stations, the radio frame to the sending station according to the received wireless signal, includes: the receiving station estimating channel busy information according to the received wireless signal by using at least one of the following manners: :
  • the detection is performed in an interframe space before the specific signal of the second type of frame format, and the channel busy information is estimated.
  • the manner of detecting in an interframe space after a specific signal of the second type of frame format, or the interframe interval before the specific signal of the second type of frame format includes: CCA (Clear Channel Assessment), Mid-packet detection, and energy detection.
  • a radio frame and transmitting the radio frame after a SIFS duration after the end of the specific signal of the second type of frame format.
  • the embodiment of the present invention further provides a wireless signal transmission system, which is applied to a transmitting station, and includes: a sending module, configured to send a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, One part is an independently decodable trigger frame of a first type of frame format, the second part is a specific signal of a second type of frame format, and the receiving module is configured to receive wireless sent by at least one of the plurality of receiving stations frame.
  • a sending module configured to send a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, One part is an independently decodable trigger frame of a first type of frame format, the second part is a specific signal of a second type of frame format, and the receiving module is configured to receive wireless sent by at least one of the plurality of receiving stations frame.
  • the first type of frame format includes a non-high throughput non-HT format or a same modulation coding mode as the non-HT format; and the second type of frame format includes a high efficiency HE format.
  • the specific signal of the second type of frame format is:
  • the training signal includes one or more training sequences; there is no interframe space between the training signal or the extended signal and the trigger frame; or
  • a null data packet NDP comprising a training signal of the second type of frame format or an extended signal, the training signal comprising one or more training sequences; the interval between the NDP and the triggering frame is SIFS.
  • the present invention further provides a wireless signal transmission system, which is applied to a receiving station, and includes: a receiving module, configured to receive a wireless signal transmitted by a transmitting station, wherein the wireless signal includes a first part and a second part, and the first part is a
  • the first type of frame format can independently decode the trigger frame
  • the second part is the specific signal of the second type of frame format
  • the sending module is configured to send the wireless frame to the sending station according to the received wireless signal.
  • the specific signal of the second type of frame format is:
  • the training signal includes one or more training sequences; there is no interframe space between the training signal or the extended signal and the trigger frame; or
  • a null data packet NDP comprising a training signal of the second type of frame format or an extended signal, the training signal comprising one or more training sequences; the interval between the NDP and the triggering frame is a short interframe space SIFS.
  • the system further includes: a receiving measurement estimating module, configured to measure one or more training sequences included in the training signal of the second type of frame format, and estimate one of the following information:
  • the system further includes: a data preparation module, configured to start preparing a radio frame to be sent to the sending station, and in the second type of frame format, when the receiving station parses the completion of the trigger frame time Before the arrival of the SIFS duration after the end of the specific signal, the preparation before the transmission of the radio frame is completed.
  • a data preparation module configured to start preparing a radio frame to be sent to the sending station, and in the second type of frame format, when the receiving station parses the completion of the trigger frame time Before the arrival of the SIFS duration after the end of the specific signal, the preparation before the transmission of the radio frame is completed.
  • a storage medium is also provided.
  • the storage medium is arranged to store program code for performing the following steps:
  • Transmitting a wireless signal to a plurality of receiving stations wherein the wireless signal includes a first portion and a second portion, the first portion is an independently decodable trigger frame of a first type of frame format, and the second portion is a second a specific signal of a class-like frame format; receiving at least one of the plurality of receiving stations to receive a wireless frame transmitted by the station.
  • the transmitting station sends a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, and the first part is a first type of frame format capable of independently decoding the trigger frame, and the second part A specific signal of the second type of frame format; the transmitting station receives a wireless frame transmitted by at least one of the plurality of receiving stations.
  • the trigger frame of the traditional frame format of the first part it is possible to use the trigger frame of the traditional frame format of the first part to complete the transmission of information such as scheduling trigger and channel reservation, to protect the next efficient transmission, and to utilize the specific signal extended by the new format of the second part. Accurate measurement estimation, ensuring efficient transmission synchronization, and increasing data preparation time for upstream multi-users.
  • 1 is an exemplary diagram of a WLAN basic service set
  • FIG. 2 is a schematic diagram of an existing WLAN radio frame structure
  • FIG. 3 is a schematic diagram of an uplink multi-user transmission process in the prior art
  • FIG. 4 is a flowchart of a method for transmitting a wireless signal according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for transmitting a wireless signal according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a method for transmitting a wireless signal according to Embodiment 1 of the present invention for uplink multi-user transmission;
  • FIG. 7 is a schematic diagram of an extended frame structure according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic diagram of a method for transmitting a wireless signal according to Embodiment 3 of the present invention for uplink multi-user transmission.
  • FIG. 4 is a flowchart of a method for transmitting a wireless signal according to an embodiment of the present invention. As shown in FIG. 4, the method for transmitting a wireless signal provided by this embodiment includes the following steps:
  • Step 11 The transmitting station sends a wireless signal to one or more receiving stations.
  • the wireless signal includes a first part and a second part, the first part is an independently decodable trigger frame of a first type of frame format, and the second part is a specific signal of a second type of frame format.
  • the trigger frame includes a physical layer header and a data payload of the first type of frame format, and the physical layer header of the first type of frame format is used to assist the receiving station to receive the data load of the first type of frame format, and the first type of frame
  • the formatted data payload is used to trigger the receiving station to send a radio frame to the transmitting station; the specific signal of the second type of frame format is used to assist the receiving station to prepare a radio frame to be sent to the transmitting station.
  • the first part can be independently decoded, that is, the decoding of the content of the trigger frame does not need to depend on a specific signal of the second type of frame format.
  • the first type of frame format includes a non-HT format or the same tone as the non-HT format.
  • the coding mode; the second type of frame format includes the HE format.
  • the specific signal of the second type of frame format is a training signal or an extended signal or a supplementary signal of the second type of frame format
  • the training signal includes one or more training sequences; the training signal or the extended signal or the supplementary signal and the There is no interframe space between the trigger frames.
  • the specific signal of the second type of frame format is a null data packet (NDP, Null Data Packet) including a training signal or an extended signal of the second type of frame format, and the training signal includes one or more training sequences;
  • the interval from the trigger frame is SIFS.
  • the physical layer frame header of the trigger frame includes indication information of a transmission duration of the trigger frame.
  • the medium access control (MAC) layer header of the trigger frame includes a transmission duration of a specific signal of the second type of frame format, a duration of one or more radio frames sent by the receiving station, and a sending station. The length of one or more response frames sent and the indication of the duration of the interframe interval.
  • MAC medium access control
  • the MAC layer frame header of the trigger frame includes indication information of a frame type and/or a subframe type, where the frame type and/or the subframe type is used to indicate that the trigger frame is used to trigger multiple receiving stations to send.
  • the condition for determining the specific signal of the second type of frame format after the trigger frame includes: the frame type of the trigger frame, the indication information in the trigger frame, or the sequence implicitly indicating that there is a second type of frame format after the trigger frame
  • the specific signal; the indication information or sequence in the trigger frame also implicitly indicates that the specific signal includes at least one of the following information: length, format.
  • the trigger frame includes at least one of the following indication information of the training signal of the second type of frame format:
  • the indication information of the transmission parameter of the training signal of the second type of frame format is the indication information of the transmission parameter of the training signal of the second type of frame format.
  • the sending parameters include, for example, a symbol period and a guard interval type (GI, Guard). Interval), transmission channel bandwidth.
  • GI Guard interval type
  • Interval transmission channel bandwidth
  • Step 12 The transmitting station receives a radio frame sent by at least one of the plurality of receiving stations.
  • FIG. 5 is a flowchart of a method for transmitting a wireless signal according to an embodiment of the present invention. As shown in FIG. 5, the method for transmitting a wireless signal provided by this embodiment includes the following steps:
  • Step 21 A plurality of receiving stations receive a wireless signal transmitted by the transmitting station.
  • the wireless signal includes a first part and a second part, the first part is an independently decodable trigger frame of a first type of frame format, and the second part is a specific signal of a second type of frame format.
  • the trigger frame includes a physical layer header and a data payload of the first type of frame format
  • the physical layer header of the first type of frame format is used to assist the receiving station to receive the data load of the first type of frame format, and the first type of frame
  • the formatted data payload is used to trigger the receiving station to send a radio frame to the transmitting station; the specific signal of the second type of frame format is used to assist the receiving station to prepare a radio frame to be sent to the transmitting station.
  • the first type of frame format includes a non-HT format or a modulation coding mode that is the same as the non-HT format; and the second type of frame format includes an HE format.
  • the specific signal of the second type of frame format is a training signal or an extended signal of the second type of frame format
  • the training signal includes one or more training sequences; there is no interframe between the training signal or the extended signal and the trigger frame. interval.
  • the specific signal of the second type of frame format is an NDP including a training signal or an extended signal of the second type of frame format, and the training signal includes one or more training sequences; the interval between the NDP and the trigger frame is SIFS.
  • the physical layer frame header of the trigger frame includes indication information of a transmission duration of the trigger frame.
  • the MAC layer frame header of the trigger frame includes a transmission duration of a specific signal of the second type of frame format, a duration of one or more radio frames sent by the receiving station, and one or more response frames sent by the transmitting station. The duration and the indication of the interval between frames.
  • the MAC layer frame header of the trigger frame includes a frame type and/or a subframe type.
  • the message type and/or the subframe type are used to indicate that the trigger frame is used to trigger multiple receiving stations to send a radio frame, and the trigger frame is followed by a specific signal of a second type of frame format.
  • the trigger frame includes at least one of the following indication information of the training signal of the second type of frame format:
  • the indication information of the transmission parameter of the training signal of the second type of frame format is the indication information of the transmission parameter of the training signal of the second type of frame format.
  • the sending parameters include, for example, a symbol period, a guard interval type (GI, Guard Interval), and a transmission channel bandwidth.
  • GI Guard Interval
  • Step 22 At least one of the plurality of receiving stations sends a radio frame to the transmitting station according to the received wireless signal.
  • step 22 includes: after the receiving station parses the completion of the trigger frame, preparing a radio frame to be sent to the transmitting station, and transmitting the radio frame after the SIFS duration after the end of the specific signal of the second type of frame format .
  • step 22 includes: receiving, by the station, one or more training sequences included in the training signal of the second type of frame format, and estimating one of the following information:
  • the adjusting parameter includes at least one of the following: a frequency offset adjustment amount, a transmission power adjustment amount, and a transmission delay adjustment amount.
  • step 22 includes: the receiving station estimating the channel busy information according to the received wireless signal by using at least one of the following methods:
  • the detection is performed during the interframe space before the specific signal of the second type of frame format, and the channel busy information is estimated.
  • the manner of detecting in the inter-frame interval time after the specific signal of the second type of frame format, or the detecting manner in the inter-frame interval time before the specific signal of the second type of frame format includes: idle channel evaluation (CCA, Clear Channel Assessment), Mid-packet detection, energy detection.
  • CCA Clear Channel Assessment
  • Mid-packet detection energy detection.
  • An AP supporting uplink multi-user transmission establishes a basic server set (BSS), and multiple non-AP STAs perform an association authentication process with the AP to form a BSS.
  • BSS basic server set
  • the AP interacts with each site with capability information, including an indication of whether to support the uplink multi-user transmission capability.
  • capability information including an indication of whether to support the uplink multi-user transmission capability.
  • FIG. 6 is a schematic diagram of a method for transmitting a wireless signal according to Embodiment 1 of the present invention for uplink multi-user transmission.
  • FIG. 7 is a schematic diagram of an expanded frame structure according to Embodiment 1 of the present invention.
  • an uplink multi-user transmission uses a trigger frame of a conventional frame format and a training signal of a second portion of the HE format.
  • the AP transmits a trigger frame of a conventional format, that is, a non-HT format, and transmits a training signal (including one or more training sequence fields) of the HE format.
  • the training domain may be a short training domain in the HE format, a long training domain, and combinations thereof.
  • the triggering frame indicates that the scheduling STA1, STA2, STA3, and STA4 perform uplink parallel transmission, and indicates the resources and transmission parameters of each user that are sent by the uplink multi-user.
  • STA1 to STA4 detect the trigger frame sent by the AP and the training signal of the HE format in the second part.
  • the STA1 is taken as an example. The process is as follows: when the format of the trigger frame is detected as the traditional frame format, STA1 receives the frame according to the traditional frame format.
  • the triggering frame is configured to perform the uplink multi-user transmission according to the indication information in the triggering frame, where the triggering frame includes the uplink resource of the STA1, and the indication information of the sending parameter, such as the sending duration and the guard interval.
  • STA1 receives the completion trigger frame After the uplink data transmission preparation is started, that is, starting from point A in FIG.
  • the physical layer of STA1 passes the decoded trigger frame to the medium access control (MAC) layer of STA1, and the MAC layer of STA1 is triggered according to the MAC layer.
  • the indication information of the frame starts to prepare the uplink data packet.
  • STA1 (mainly the physical layer) continues to detect the training signal of the second part for more accurately estimating STA1.
  • STA1 adjusts the frequency offset of the transmitted radio frame to ensure that it is aligned with the AP as much as possible on the frequency offset.
  • the time for the station to prepare the uplink data in the uplink multi-user can be increased.
  • the preparation time is equal to the transmission time of the second part signal plus the SIFS time. (It may be necessary to subtract some processing delay); it can also ensure that STA1 accurately measures the frequency offset between the local crystal and the AP crystal according to the signal of the second part of the HE format, and STA1 can use these measurements to adjust its own frequency offset. To ensure that the uplink multi-user transmissions are as orthogonal as possible and do not interfere with each other.
  • the AP receives the multi-user radio frame sent by the foregoing STA1 to STA4, and sends a feedback frame whose frame type or format is set to a block acknowledgement frame for multi-user data acknowledgement and paging, which is simply referred to as a multi-user response frame (MU_BA). It includes confirmation information for data in a multi-user radio frame transmitted by each of STA1 to STA4.
  • MU_BA multi-user response frame
  • the physical layer frame header in the trigger frame includes indication information of a transmission frame length of the trigger frame, for example, using a signaling domain SIG in a physical layer frame header, indicating a data length and a rate parameter to be sent, thereby determining a transmission duration of the trigger frame.
  • the trigger frame transmission duration information indicated in the physical layer header signaling includes the transmission duration of the trigger frame, and does not include the transmission duration of the specific signal of the second portion of the HE frame format, thus ensuring all receiving sites (including the legacy site) ) can correctly parse the end of the trigger frame.
  • the MAC frame header in the trigger frame includes time length indication (Duration) information, which is used to reserve channel time, and avoids site access channels other than STA1 to STA4.
  • Duration time length indication
  • both the new device and the conventional 802.11a/g/n/ac site can parse the Duration value and set the Local Network Allocation Vector (NAV) to Avoid interference with upstream multi-user transmissions.
  • the duration indicated by the Duration value includes the training message of the second part of the HE frame format.
  • an uplink multi-user transmission uses a trigger frame of a conventional frame format and an extended signal of a HE format of the second portion.
  • the AP transmits a trigger frame of a conventional format, that is, a non-HT format, and transmits an extended signal of the HE format thereafter, wherein the extended signal may be a special sequence of the HE format.
  • the special sequence of the HE format is a special information bit sequence predefined by the HE related protocol. For example, it can be a sequence of all ones.
  • the triggering frame indicates that the scheduling STA1, STA2, STA3, and STA4 perform uplink parallel transmission, and indicates the resources and transmission parameters of each user that are sent by the uplink multi-user.
  • STA1 to STA4 detect the trigger frame sent by the AP and the extended signal of the HE format in the second part.
  • the STA1 is taken as an example. The process is as follows: when the format of the trigger frame is detected as the traditional frame format, STA1 receives the frame according to the traditional frame format.
  • the triggering frame is configured to perform the uplink multi-user transmission according to the indication information in the triggering frame, where the triggering frame includes the uplink resource of the STA1, and the indication information of the sending parameter, such as the sending duration and the guard interval.
  • STA1 starts to perform uplink transmission data preparation after receiving the trigger frame.
  • the physical layer of STA1 delivers the decoded trigger frame to the MAC layer of STA1, and the MAC layer of STA1 starts to prepare the uplink data packet according to the indication information of the trigger frame.
  • the STA1 does not detect the second part of the extended signal, but the STA1 is to be after the transmission time of the part of the signal.
  • the uplink data can be sent after the SIFS duration.
  • STA1 uses the traditional signaling domain included in the traditional trigger frame to estimate the frequency offset and other adjustment parameters between STA1 itself and the AP. For uplink multi-user transmission, STA1 adjusts the frequency offset of the transmitted radio frame.
  • the time for the stations (STA1 to STA4) in the uplink multi-user to prepare the uplink data can be increased, and the preparation time is equal to the transmission time of the extension signal of the second part plus the SIFS duration ( It may be necessary to subtract some processing delay).
  • STA1 to STA4 do not process the extension signal of the HE portion of the second part, thereby reducing the burden on themselves and simplifying the reception processing.
  • the AP receives the multi-user radio frame sent by the foregoing STA1 to STA4, and sends a feedback frame whose frame type or format is set to a block acknowledgement frame for multi-user data acknowledgement and paging, which is simply referred to as a multi-user response frame (MU_BA). It includes confirmation information for data in a multi-user radio frame transmitted by each of STA1 to STA4.
  • MU_BA multi-user response frame
  • the physical layer frame header in the trigger frame includes indication information of a transmission frame length of the trigger frame, for example, using a signaling domain SIG in a physical layer frame header, indicating a data length and a rate parameter to be sent, thereby determining a transmission duration of the trigger frame.
  • the trigger frame transmission duration information indicated in the physical layer header signaling includes the transmission duration of the trigger frame, and does not include the transmission duration of the extension signal of the second portion of the HE frame format, thus ensuring all receiving sites (including the legacy site) ) can correctly parse the end of the trigger frame.
  • the MAC frame header in the trigger frame includes time length indication (Duration) information, which is used to reserve channel time, and avoids site access channels other than STA1 to STA4.
  • Duration time length indication
  • both the new device and the conventional 802.11a/g/n/ac site can parse the Duration value and set the Local Network Allocation Vector (NAV) to Avoid interference with upstream multi-user transmissions.
  • the duration indicated by the duration value includes the transmission duration of the extended signal in the HE frame format of the second part, the duration of the uplink radio frame transmitted by STA1 to STA4, the duration of the response frame (MU-BA) transmitted by the AP, and the duration of the interframe interval therein. .
  • FIG. 8 is a schematic diagram of a method for transmitting a wireless signal according to Embodiment 3 of the present invention for uplink multi-user transmission.
  • an uplink multi-user transmission uses a trigger frame of a conventional frame format and a null data packet (NDP, Null Data Packet) of the second part.
  • NDP null Data Packet
  • the AP transmits a trigger frame of a conventional format, that is, a non-HT format, and transmits an NDP of the HE format after the SIFS duration.
  • the NDP includes a short training domain in the HE format, a long training domain, and combinations thereof.
  • the trigger frame includes indication information for scheduling STA1, STA2, STA3, and STA4 to perform uplink parallel transmission, and information of each user's resources and transmission parameters sent by the uplink multi-user.
  • STA1 to STA4 detect the trigger frame sent by the AP. Take STA1 as an example. The process is as follows: If the format of the trigger frame is the traditional frame format, the STA1 receives the trigger frame according to the traditional frame format, and finds that it is scheduled to perform uplink multi-user transmission according to the indication information in the trigger frame, where the trigger frame includes the uplink of the STA1. Indicates the parameters of the transmission parameters such as the resource, the transmission duration, and the guard interval. STA1 starts to perform uplink transmission data preparation after receiving the trigger frame, that is, starting from point A in FIG. 8, the physical layer of STA1 delivers the decoded trigger frame to the MAC layer of STA1, and the MAC layer of STA1 according to the indication information of the trigger frame.
  • the STA1 (mainly the physical layer) continues to detect the second part of the NDP for more accurately estimating the relationship between the STA1 itself and the AP.
  • the STA1 adjusts the frequency offset of the transmitted radio frame to ensure that it is aligned with the AP as much as possible on the frequency offset.
  • the transmission of the NDP in the HE format of the second part can increase the time for the uplink multi-user to prepare the uplink data.
  • the preparation time is equal to the transmission time of the NDP plus two SIFS durations (possibly It is necessary to subtract some processing delays.
  • STA1 can also ensure that STA1 accurately measures the frequency offset between the local crystal oscillator and the AP crystal oscillator according to the HE format of the HE format. STA1 can use these measurements to adjust its own frequency offset to ensure the uplink multi-user.
  • the transmissions are as orthogonal as possible and do not interfere with each other.
  • the AP receives the multi-user radio frame sent by the foregoing STA1 to STA4, and sends a feedback frame whose frame type or format is set to a block acknowledgement frame for multi-user data acknowledgement and paging, which is simply referred to as a multi-user response frame (MU_BA). It includes confirmation information for data in a multi-user radio frame transmitted by each of STA1 to STA4.
  • MU_BA multi-user response frame
  • the physical layer frame header in the trigger frame includes indication information of a transmission frame length of the trigger frame, for example, using a signaling domain SIG in a physical layer frame header, indicating a data length and a rate parameter to be sent, thereby determining a transmission duration of the trigger frame.
  • the trigger frame transmission duration information indicated in the physical layer header signaling includes the transmission duration of the trigger frame, thereby ensuring that all receiving sites (including legacy sites) can correctly parse the end of the trigger frame.
  • the MAC frame header in the trigger frame includes time length indication (Duration) information, which is used to reserve channel time, and avoids site access channels other than STA1 to STA4.
  • Duration time length indication
  • Duration value and set the local network allocation vector (NAV, Network Allocation Vector) to avoid interference with upstream multi-user transmission.
  • the duration indicated by the duration value includes the transmission duration of the HE frame format NDP, the duration of the uplink radio frame transmitted by STA1 to STA4, the duration of the response frame (MU-BA) transmitted by the AP, and the interframe spacing duration therein.
  • an uplink multi-user transmission uses a physical layer signaling trigger frame of the same modulation and coding scheme as the non-HT format and a specific signal of the second portion of the HE format.
  • the AP transmits a physical layer signaling format trigger frame that is processed in the same manner as the non-HT format and transmits a subsequent specific signal of the HE format, wherein the processing is the same as the non-HT format.
  • the triggering frame of the physical layer signaling format refers to the physical layer signaling domain defined by the new technology, that is, the triggering frame can use the newly defined format, but the signaling domain still uses the traditional modulation and coding mode, and the signal is not performed. Space processing such as beamforming.
  • the trigger frame includes indication information for scheduling STA1, STA2, STA3, and STA4 to perform uplink parallel transmission, and information of each user's resources and transmission parameters sent by the uplink multi-user.
  • STA1 to STA4 detect the trigger frame sent by the AP and the specific signal in the HE format of the second part.
  • the process is: detecting the trigger frame and finding that it is scheduled to perform uplink according to the indication information in the trigger frame.
  • Multi-user transmission where the trigger frame includes indication information of the uplink resource of the STA1, the transmission duration, the guard interval, and the like.
  • the STA1 starts to perform uplink transmission data preparation after receiving the physical layer signaling including the trigger frame information, that is, the physical layer of STA1 delivers the decoded trigger frame information to the MAC layer of STA1, and the MAC layer of STA1 according to the indication of the trigger frame.
  • the information begins to prepare for the upstream packet.
  • the STA1 detects the specific signal of the second part, and estimates the STA1 itself and the AP according to the specific signal.
  • the adjustment parameters such as the frequency offset are used for uplink multi-user transmission, and STA1 adjusts the frequency offset of the transmitted radio frame to ensure that it is aligned with the AP as much as possible on the frequency offset.
  • the AP receives the multi-user radio frame sent by the foregoing STA1 to STA4, and sends a feedback frame, and the frame type or format is set as a block confirmation frame for multi-user data confirmation and paging, which is referred to as multi-user.
  • the trigger frame may also be sent in other newly defined formats.
  • the present invention does not limit the trigger frame to be transmitted using the non-HT format, for example, the HE format may also be used for transmission.
  • the station may perform channel estimation according to a specific signal of the second type of frame format after the received trigger frame.
  • the AP transmits a trigger frame of a conventional format, that is, a non-HT format, and transmits a training signal (including a training sequence field) of the HE format or an NDP including a training signal (including a training sequence domain) of the HE format, where the training domain It may be a short training field in the HE format, a long training field, and a combination of the above.
  • the station that receives the training domain in the HE format sent by the AP can detect the training domain, and use the training field of the HE format as a detection signal ( Sounding signal).
  • the process is as follows: after receiving the trigger frame, the trigger frame implicitly or indicates that the training signal of the second part of the HE format or the NDP of the training signal including the HE format is indicated after the trigger frame. Then STA1 (mainly the physical layer) continues to detect the training sequence field of the second part, is used to estimate the channel information between the AP and STA1, and can generate a corresponding measurement report.
  • the trigger frame implicitly or indicates that the training signal of the second part of the HE format or the NDP of the training signal including the HE format is indicated after the trigger frame.
  • STA1 (mainly the physical layer) continues to detect the training sequence field of the second part, is used to estimate the channel information between the AP and STA1, and can generate a corresponding measurement report.
  • the station may perform the determination of the channel busy information according to the specific signal of the second type of frame format after the received trigger frame.
  • the AP sends a trigger frame of a conventional format, that is, a non-HT format, and transmits a specific signal of the HE format, for example, the specific signal may be a short training field of the HE format, a long training domain, and a combination of the foregoing or a receiving station. Other wireless signals that are known.
  • the destination receiving station of the trigger frame determines that it is scheduled by the AP to perform uplink radio frame transmission, and the stations continue to detect the specific signal of the subsequent second frame format, and determine the second.
  • the receiving quality of the specific signal in the class frame format on the uplink resource scheduled by the station determining whether the channel is available, that is, whether it is idle, and then determining whether to send the uplink radio frame in response to the scheduling of the AP.
  • the process is as follows:
  • the AP sends a trigger frame, where the scheduling STA1 performs uplink transmission on channel 1 and the scheduling STA2 transmits on channel 2.
  • the AP continues to transmit a specific signal after the trigger frame.
  • STA1 After STA1 receives the trigger frame, STA1 finds that the trigger frame schedules itself to perform uplink transmission on channel 1, and STA1 (mainly the physical layer) continues to detect the specific signal of the second part, and detects the specific signal on channel 1. Or whether the reception quality judgment channel 1 is occupied or whether the interference is serious. Assuming that STA1 detects that the specific signal of the second part of channel 1 is subjected to little interference, and considers that channel 1 is idle, STA1 can transmit a radio frame to the AP on the uplink of channel 1.
  • STA2 is a similar operation. STA2 detects the quality of a specific signal on channel 2 after receiving the completion trigger frame. If the specific signal of the second part on channel 2 is subjected to a large interference, STA2 considers that channel 2 is busy. Does not respond to AP scheduling.
  • the station may perform channel busy information determination according to the received inter-frame interval after the trigger frame and the specific signal of the second type of frame format.
  • the AP transmits a trigger frame of a conventional format, that is, a non-HT format, and transmits a specific signal of the HE format thereafter.
  • the specific signal may be an extended signal in the HE format or other wireless signals known to the receiving station.
  • the stations may decode the trigger frame within the extended signal sending time, and if it is determined to be the destination station, prepare uplink data, and the stations may continue to the second The SIFS or other interframe space after the specific signal in the frame-like format is detected, and it is determined whether there is another station on the uplink resource used by itself, that is, whether the channel is available, and then whether to respond to the scheduling of the AP to send the uplink radio frame. .
  • the process is as follows:
  • the AP sends a trigger frame, where the scheduling STA1 performs uplink transmission on channel 1 and the scheduling STA2 transmits on channel 2.
  • the AP continues to transmit a specific spread signal after the trigger frame.
  • STA1 After STA1 receives the trigger frame, STA1 finds that the triggering frame schedules itself to perform uplink transmission on channel 1, and STA1 (mainly the physical layer) continues to detect the SIFS after the second partial specific signal, and the detection method may be: CCA detection, Detection or energy detection in a frame at a specific time (CCA time in the frame, MidCCATime). Assuming that STA1 does not detect the signals of other stations within the SIFS time after the specific signal of the second part of channel 1 is detected, it is considered that channel 1 is idle, and STA1 can transmit the radio frame to the AP on the uplink of channel 1.
  • CCA detection CCA time in the frame, MidCCATime
  • STA2 is a similar operation. If it is detected that the energy of other station signals is detected within the SIFS time after the second partial specific signal on channel 2, STA2 considers that channel 2 is busy and does not respond to AP scheduling.
  • the receiving station may also use the interframe space to detect the channel idle information; the receiving station may also be implemented in combination.
  • the detection method in the sixth example and the detection method in the embodiment determine the channel busy information.
  • the AP sends a trigger frame for uplink multi-user transmission, where the trigger frame includes implicit or explicit indication information of the specific signal of the HE format of the second part after the trigger frame.
  • the specific indication method may be:
  • the frame type of the trigger frame determines that the specific signal of the second type of frame format is continued to be sent after the trigger frame, for example, the MAC frame header of the trigger frame includes indication information of a frame type and a subframe type, and the frame type and the subframe type are used.
  • the triggering frame is used to trigger the wireless frame transmission of the multiple receiving stations, and the triggering frame is followed by a specific signal of the second type of frame format, that is, the specific signal protocol standard pair is pre-specified or previously related. Agreement,
  • a specific combination of some other indication information in the trigger frame or a special sequence indication implicitly indicates that the specific signal of the second type of frame format is followed by the frame, and further, if necessary, further indicating the length of the specific signal, Further, the indication length and format refer to a specific combination of the above frame type and subframe type or some other indication information. Or a special sequence indicating an implicit indication, for example, when the frame type is a trigger frame, the default length of the specific signal is fixed to a length value, and, for example, implicitly indicates the format of the specific signal, triggering the frame
  • the format may implicitly indicate the format of a specific signal.
  • the format of the specific signal is a specific information bit sequence.
  • the format of the specific signal is a spread signal of a specific format.
  • the trigger frame is transmitted in the traditional frame format
  • at least one of the following indication information of the training signal of the second type of frame format is explicitly included in the MAC layer frame header or payload of the trigger frame:
  • the indication information of the sending parameter of the training signal of the second type of frame format where the sending parameter specifically includes: a symbol period, a guard interval (GI, Guard Interval) type, and a transmission channel bandwidth;
  • GI Guard Interval
  • the embodiment of the present invention further provides a wireless signal transmission system, which is applied to a transmitting station, and includes: a sending module, configured to send a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, One part is an independently decodable trigger frame of a first type of frame format, the second part is a specific signal of a second type of frame format, and the receiving module is configured to receive a radio frame sent by at least one of the plurality of receiving stations.
  • a sending module configured to send a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, One part is an independently decodable trigger frame of a first type of frame format, the second part is a specific signal of a second type of frame format, and the receiving module is configured to receive a radio frame sent by at least one of the plurality of receiving stations.
  • the first type of frame format includes a non-HT format or a modulation coding mode that is the same as the non-HT format; and the second type of frame format includes an HE format.
  • the specific signal of the second type of frame format is a training signal or an extended signal of the second type of frame format
  • the training signal includes one or more training sequences; the training signal or the extended signal and the There is no interframe space between the trigger frames.
  • the specific signal of the second type of frame format is a null data packet NDP including a training signal or an extended signal of the second type of frame format, the training signal includes one or more training sequences; the NDP and the The interval of the trigger frame is the short interframe space SIFS.
  • the embodiment of the present invention further provides a wireless signal transmission system, which is applied to a receiving station, and includes: a receiving module, configured to receive a wireless signal sent by a transmitting station, where the wireless signal includes a first part and a second part, and the first part
  • the first frame type is an independently decodable trigger frame
  • the second part is a specific signal of the second type of frame format
  • the sending module is configured to send a radio frame to the transmitting station according to the received wireless signal.
  • the specific signal of the second type of frame format is a training signal or an extended signal of the second type of frame format
  • the training signal includes one or more training sequences; the training signal or the extended signal and the There is no interframe space between the trigger frames.
  • the specific signal of the second type of frame format is a null data packet NDP including a training signal or an extended signal of the second type of frame format, the training signal includes one or more training sequences; the NDP and the The interval of the trigger frame is the short interframe space SIFS.
  • system further includes a receiving measurement estimating module configured to measure one or more training sequences included in the training signal of the second type of frame format, and estimate one of the following information:
  • the system further includes: a data preparation module, configured to start preparing a radio frame to be sent to the sending station at a time when the receiving station parses the trigger frame, and is specific to the second type of frame format. Before the arrival of the SIFS duration after the end of the signal, the preparation before the transmission of the radio frame is completed.
  • a data preparation module configured to start preparing a radio frame to be sent to the sending station at a time when the receiving station parses the trigger frame, and is specific to the second type of frame format. Before the arrival of the SIFS duration after the end of the signal, the preparation before the transmission of the radio frame is completed.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • S1 Send a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, where the first part is an independently decodable trigger frame of a first type of frame format, and the second part is a specific signal of the second type of frame format;
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the transmitting station sends a wireless signal to multiple receiving stations, where the wireless signal includes a first part and a second part, and the first part is a first type of frame format capable of independently decoding the trigger frame, and the second part A specific signal of the second type of frame format; the transmitting station receives a wireless frame transmitted by at least one of the plurality of receiving stations.
  • the trigger frame of the traditional frame format of the first part it is possible to use the trigger frame of the traditional frame format of the first part to complete the transmission of information such as scheduling trigger and channel reservation, to protect the next efficient transmission, and to utilize the specific signal extended by the new format of the second part. Accurate measurement estimation, ensuring efficient transmission synchronization, and increasing data preparation time for upstream multi-users.

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Abstract

L'invention concerne un procédé et un système d'émission de signal sans fil, le procédé comprenant : l'envoi, par une station d'envoi, d'un signal sans fil à une pluralité de stations de réception, le signal sans fil comprenant une première partie et une seconde partie, la première partie étant divisée en une trame de déclenchement qui possède un premier type de format de trame et qui peut être décodée de manière indépendante, la seconde partie étant divisée en un signal spécifique qui possède un second type de format de trame ; la réception, par la station d'envoi, d'une trame sans fil envoyée par au moins une station de réception dans la pluralité de stations de réception. Le procédé et le système d'émission de signal sans fil sont utilisés pour résoudre les problèmes de l'état antérieur de la technique, selon lesquels une trame de déclenchement n'est pas capable d'achever une réservation de ressources d'émission et de déclencher une émission multi-utilisateur, tout en satisfaisant la précision d'apprentissage requise pour une émission multi-utilisateur en liaison montante, et il n'est pas possible d'assurer qu'une station aura suffisamment de temps pour préparer des données de liaison montante après la réception d'une trame de déclenchement.
PCT/CN2016/096273 2015-06-23 2016-08-22 Procédé et système d'émission de signal sans fil WO2016206652A2 (fr)

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