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WO2017113989A1 - Procédé et appareil permettant de transmettre une trame dans un réseau local sans fil - Google Patents

Procédé et appareil permettant de transmettre une trame dans un réseau local sans fil Download PDF

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Publication number
WO2017113989A1
WO2017113989A1 PCT/CN2016/104894 CN2016104894W WO2017113989A1 WO 2017113989 A1 WO2017113989 A1 WO 2017113989A1 CN 2016104894 W CN2016104894 W CN 2016104894W WO 2017113989 A1 WO2017113989 A1 WO 2017113989A1
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WIPO (PCT)
Prior art keywords
target
frame structure
ppdu
mac frame
field
Prior art date
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PCT/CN2016/104894
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English (en)
Chinese (zh)
Inventor
杨讯
林梅露
淦明
刘乐
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201610082069.2A external-priority patent/CN106936553B/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP16880780.8A priority Critical patent/EP3382925B1/fr
Publication of WO2017113989A1 publication Critical patent/WO2017113989A1/fr
Priority to US16/019,295 priority patent/US10764413B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to the field of wireless technologies, and in particular, to a method and an apparatus for frame transmission in a wireless local area network.
  • Uplink Multiple-Input Multiple-Output (MIMO) technology and Orthogonal Frequency Division Multiple Access (OFDMA) technology have been widely used in wireless communications as the key to increasing capacity and number of users. technology.
  • MIMO Multiple-Input Multiple-Output
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the certain time described above is generally defined as a Short Inter-Frame Space (SIFS).
  • SIFS Short Inter-Frame Space
  • the receiving station needs to first parse the trigger information carried by the trigger frame, and then according to the trigger. Information is transmitted using resources transmitted upstream.
  • the SIFS time receiving site is not sufficient to complete the above steps.
  • a more suitable solution is through the padding design of the Media Access Control (MAC) layer, which is to add a useless signal after the useful signaling.
  • This useless signal is the MAC frame.
  • the AP sends this part of the useless signal, which not only achieves sufficient time for the receiving station to parse the trigger information carried by the trigger frame, but also uses the uplink transmission resource to transmit data according to the trigger information, and ensures the purpose.
  • the wait time between adjacent frames is still SIFS.
  • this design is only applicable to the legacy type of physical layer protocol data unit (PPDU) and is not applicable to subsequent versions.
  • PPDU physical layer protocol data unit
  • the embodiment of the invention provides a method and a device for transmitting a frame in a wireless local area network, and can determine whether the target MAC frame structure includes a packet extension field by using a target type of the PPDU and a target encapsulation format of the target MAC frame structure carrying the trigger frame, thereby adapting to each Version of the PPDU.
  • an embodiment of the present invention provides a method for frame transmission in a wireless local area network, including:
  • the access point generates a physical layer protocol data unit (PPDU) of the target type, where the PPDU includes a target medium access control MAC frame structure that carries a trigger frame generated by using a target encapsulation format, where the target MAC frame structure includes a packet extension field. Determined according to the target type and the target package format;
  • PPDU physical layer protocol data unit
  • the access point sends the PPDU.
  • the target encapsulation format is an aggregate AMPDU
  • the packet extension field is not included in the target MAC frame structure
  • the PPDU includes means for indicating that the target MAC frame structure does not include the packet extension field And the indication information, where the indication information includes a first end position indicated by an effective trigger length field of the trigger frame and a second end position indicated by an MPDU Delimiter of the AMPDU, where the first end position and location The second end position is the same.
  • the packet extension field includes at least one of a Padding field and an FCS2 field;
  • the target encapsulation format is an MPDU
  • the target MAC frame structure determines, by the target MAC frame structure, whether the packet extension field is determined according to whether the HE PPDU type, the MPDU encapsulation format, and an effective length of the target MAC frame structure meet a preset condition, where the preset is The condition is that the effective length of the target MAC frame structure is less than the position of the length of the PPDU;
  • the target MAC frame structure includes the packet extension field
  • the target MAC frame structure does not include the packet extension field.
  • the PPDU includes a target for indicating the target
  • the MAC frame structure includes indication information of the packet extension field, where the indication information includes a third cutoff position indicated by an effective length field of the trigger frame and a fourth cutoff position indicated by a length field of the PPDU, where a byte difference between the fourth cutoff position and the third cutoff position is greater than a preset threshold;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes that the trigger frame is valid. a sixth cut-off position indicated by the length field and a sixth cut-off position indicated by a length field of the PPDU, wherein a byte difference between the sixth cut-off position and the fifth cut-off position is less than or equal to a preset Threshold.
  • the PPDU includes, to indicate the target
  • the MAC frame structure includes indication information of the packet extension field, where the indication information includes a length that is encapsulated in a valid length field of the trigger frame and belongs to a preset range. value;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes that the trigger frame is valid.
  • the target type is a very high throughput VHT PPDU.
  • the target encapsulation format is an AMPDU;
  • the target MAC frame structure includes the packet extension field
  • the PPDU includes indication information indicating that the target MAC frame structure includes the packet extension field, where the indication information includes a seventh end position indicated by a valid trigger length field of the trigger frame and an MPDU of the AMPDU. An eighth cut-off position indicated by the Delimiter, wherein the seventh cut-off position is different from the eighth cut-off position.
  • a second aspect of the present invention provides a device for transmitting a frame in a wireless local area network, including:
  • a baseband circuit configured to generate a physical layer protocol data unit (PPDU) of a target type, where the PPDU includes a target media access control MAC frame structure that carries a trigger frame generated by using a target encapsulation format, where the target MAC frame structure includes a packet extension field is determined according to the target type and the target encapsulation format;
  • PPDU physical layer protocol data unit
  • a radio frequency circuit configured to send the PPDU.
  • the target encapsulation format is an aggregate AMPDU
  • the packet extension field is not included in the target MAC frame structure
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes a first end position indicated by an effective trigger length field of the trigger frame and the AMPDU. a second cutoff position indicated by the MPDU Delimiter, wherein the first cutoff position is the same as the second cutoff position.
  • the packet extension field includes at least one of a Padding field and an FCS2 field;
  • the target encapsulation format is an MPDU
  • the target MAC frame structure includes the packet extension field
  • the target MAC frame structure does not include the packet extension field.
  • the PPDU includes a target for indicating the target
  • the MAC frame structure includes indication information of the packet extension field, where the indication information includes a third cutoff position indicated by an effective length field of the trigger frame and a fourth cutoff position indicated by a length field of the PPDU, where a byte difference between the fourth cutoff position and the third cutoff position is greater than a preset threshold;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes that the trigger frame is valid. a sixth cut-off position indicated by the length field and a sixth cut-off position indicated by a length field of the PPDU, wherein a byte difference between the sixth cut-off position and the fifth cut-off position is less than or equal to a preset Threshold.
  • the PPDU includes a target for indicating the target
  • the MAC frame structure includes indication information of the packet extension field, where the indication information includes a length value encapsulated in a valid length field of the trigger frame and belonging to a preset range;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes that the trigger frame is valid.
  • the target type is a very high throughput VHT PPDU.
  • the target encapsulation format is an AMPDU;
  • the target MAC frame structure includes the packet extension field
  • the PPDU includes indication information indicating that the target MAC frame structure includes the packet extension field, where the indication information includes a seventh end position indicated by a valid trigger length field of the trigger frame and an MPDU of the AMPDU. An eighth cut-off position indicated by the Delimiter, wherein the seventh cut-off position is different from the eighth cut-off position.
  • the access point generates a PPDU of a target type, where the PPDU includes a target MAC frame structure that carries a trigger frame generated by using a target encapsulation format, where the target MAC frame structure includes a packet extension field according to the target.
  • the type and the target encapsulation format are determined.
  • whether the target MAC frame structure includes a packet extension field by using a target type of the PPDU and a target encapsulation format of the target MAC frame structure carrying the trigger frame, thereby adapting to PPDUs of various version types.
  • FIG. 1 is a schematic diagram of an application scenario provided by the present invention
  • FIG. 2 is a schematic flowchart of a method for transmitting a frame in a wireless local area network according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a PPDU according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of another PPDU according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a PPDU according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a target MAC frame according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a target MAC frame according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of still another PPDU according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a PPDU according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a general-purpose MAC frame according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of still another general-purpose PPDU according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a general-purpose PPDU according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a physical device according to an embodiment of the present invention.
  • a WLAN may include a plurality of Basic Service Sets (BSSs).
  • BSSs Basic Service Sets
  • the network nodes in the basic service set are sites.
  • the sites include access point-type sites (Access Point, AP) and non-access point-type sites (None Access).
  • Point Station, Non-AP STA Point Station, Non-AP STA.
  • Each of the basic service sets may include one AP and a plurality of Non-AP STAs associated with the AP.
  • all Non-AP STAs are collectively referred to as STAs.
  • Access point class sites also known as wireless access points or hotspots.
  • the AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the AP may be a terminal device or a network device with a Wireless Fidelity (WiFi) chip.
  • WiFi Wireless Fidelity
  • the AP may be a device supporting multiple WLAN technologies such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • the PHY protocol data unit Physical Layer Protocol Data Unit
  • the PHY protocol data unit has different types, that is, the PPDU is encapsulated in different ways.
  • the non-access point class site may be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • a wireless communication terminal For example: mobile phone supporting WiFi communication function, tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, smart wearable device supporting WiFi communication function, and vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication.
  • the site can support 802.11ax, 802.11ac, Various WLAN systems such as 802.11n, 802.11g, 802.11b, and 802.11a.
  • Figure 1 is a system diagram of a typical WLAN deployment scenario, including an AP and three STAs, and the AP communicates with STA1, STA2, and STA3, respectively.
  • the AP can perform uplink and downlink transmission with different STAs on different time-frequency resources.
  • the AP can adopt different modes for uplink and downlink transmission, such as OFDMA single-user multiple-input multiple-output (SU-MIMO) mode, or OFDMA multi-user multiple input multiple output (Multi-User Multiple).
  • SU-MIMO OFDMA single-user multiple-input multiple-output
  • Multi-User Multiple OFDMA multi-user multiple input multiple output
  • MU-MIMO -Input Multiple-Output
  • the AP sends a trigger frame to each STA, and provides the resource indication information, so that the STA can learn whether it is Scheduling, and where the allocated uplink transmission resources are, what parameters should be used for transmission, how long to transmit, etc., all of which can be indicated by the trigger information in the trigger frame.
  • the AP encapsulates the trigger frame in the MAC frame structure, and uses the different types of PPDUs in the physical layer to encapsulate and send the MAC frame structure. Since different types of PPDUs have different encapsulation modes, when the MAC layer encapsulates the trigger frame,
  • the target MAC frame structure carrying the trigger frame may include a Packet Extension field or no packet extension field, but all need to be able to achieve sufficient time for the receiving station to parse the trigger information in the trigger frame.
  • the target MAC frame structure includes a packet extension field, which is mainly determined by a target type of the PPDU and a target encapsulation format of the target MAC frame structure, for example, if a target type of a High Efficiency PPDU (HE PPDU) is used.
  • the field can also be used to allow the receiving site enough time to parse the trigger information in the trigger frame.
  • the PPDU sent by the AP includes a Physical Layer Convergence Procedure (PLCP) header field and a data field, where the PLCP Header includes a legacy preamble (L-Preamble) and an efficient preamble.
  • the leading part contains high efficiency
  • the PPDU may also include a Media Access Control (MAC) part, that is, a target MAC frame structure, and the target MAC frame structure may be encapsulated in an MPDU encapsulation format, or may be encapsulated in an AMPDU encapsulation format. .
  • MAC Media Access Control
  • FIG. 2 is a flowchart of a method for transmitting a frame in a wireless local area network according to an embodiment of the present invention.
  • the method may be applied to an access point, for example, the AP in FIG. 1 , and the access point may support multiple WLAN standards.
  • System. 2 is a flow chart of frame transmission in the WLAN, and the specific steps are as follows:
  • the access point generates a physical layer protocol data unit (PPDU) of a target type, where the PPDU includes a target medium access control MAC frame structure that carries a trigger frame generated by using a target encapsulation format, where the target MAC frame structure includes a packet.
  • PPDU physical layer protocol data unit
  • An extension field is determined according to the target type and the target encapsulation format;
  • the AP generates a PPDU of a target type.
  • the types of PPDUs generated by the AP are different.
  • the target type may be a HE PPDU, or the target type may be a High Throughput PPDU (HT PPDU), or the target type may also be a Very High Throughput (VHT PPDU).
  • VHT PPDU Very High Throughput
  • the present embodiment does not limit the target type, and is merely an example here.
  • the PPDU includes a target MAC frame structure that carries a trigger frame generated by using a target encapsulation format
  • the target MAC frame structure is a structure encapsulated at a MAC layer.
  • the MAC layer is used to encapsulate the trigger frame.
  • the target encapsulation format is optional.
  • the target encapsulation format may be an AMPDU format, or may be an MPDU format, which is not limited herein.
  • the triggering frame carried in the target MAC frame structure includes trigger information, where the trigger information is used to indicate uplink transmission resources of each station.
  • the target MAC frame structure may be implemented by carrying a packet extension field, that is, adding a piece of useless information after the useful signaling, and sending the useless portion. The signal can be used to allow the receiver sufficient time to resolve the trigger information carried in the trigger frame.
  • the manner in which the extension layer is encapsulated in the MAC layer may be sufficient to allow the receiver to have sufficient resolution.
  • the target encapsulation format does not allow the MAC layer to have extra packet extension, in which case there is no need to have packet extension at the MAC layer.
  • the following describes the encapsulation mode and indication scheme of the trigger frame in various types of PPDUs by using several optional target types and target encapsulation formats as examples.
  • the target type is an HE PPDU
  • the target MAC frame structure carrying the trigger frame is encapsulated in a target encapsulation format of the AMPDU
  • the HE PPDU has a packet extension function and a target encapsulation of the AMPDU.
  • the target MAC frame structure does not include the packet extension field of the trigger frame, but because there is a physical layer packet extension, the receiving station still has enough time to parse the trigger information.
  • the MPDU encapsulation structure in the AMPDU encapsulation format provided by the embodiment of the present invention includes a valid trigger length field and an MPDU delimiter field.
  • the valid trigger length field encapsulates the effective trigger length of the trigger frame, and the cutoff position indicated by the valid trigger length is the first Frame Check Sequence (FCS1) field, and there is no packet extension due to the target MAC frame structure.
  • FCS1 Frame Check Sequence
  • the field, so the end position indicated by the MPDU Length encapsulated by the MPDU Delimiter is also FCS1. That is, the first cutoff position indicated by the valid trigger length field is the same as the second cutoff position indicated by the MPDU Delimiter of the AMPDU.
  • the receiving station STA reads the MPDU Length in the MPDU Delimiter, and then reads the frame control field to learn that the MPDU after the MDPU Delimiter is the trigger frame, and further reads the Effective Trigger Length.
  • the STA compares the MPDU Length and the Effective Trigger Length. If the two are at the same position, the trigger frame does not include a packet extension field. It can be understood that the receiving station STA can also determine whether the PPDU is an HE PPDU according to standard specifications, and whether the encapsulation format of the MAC layer is an AMPDU. If yes, it is determined that the trigger frame does not include a packet extension field.
  • the structure of the MPDU in the AMPDU encapsulation format shown in FIG. 3 also includes another implementation.
  • the length indicated by the MPDU Delimiter is from the start position of the Frame Control field (Frame Control) to the end of the Frame Check Field (FCS), so the cutoff position indicated by the MPDU Delimiter is the frame check field (FCS).
  • End position the length indicated by the valid trigger length field is from the start position of the common trigger information (common info) field to the end position of the per-site trigger information (Per STA Info) field, so the effective trigger length field indicates The end position is the end position of the Per Site Info field.
  • the receiving station STA reads the MPDU Length in the MPDU Delimiter, and then reads the frame control field to learn that the MPDU after the MDPU Delimiter is the trigger frame, and further reads the Effective Trigger Length.
  • the STA compares the MPDU Length and the Effective Trigger Length. If the positions of the two are different by one FCS (usually 4 bytes), the trigger frame does not include the packet extension field. It can be understood that the receiving station STA can also determine whether the PPDU is an HE PPDU according to standard specifications, and whether the encapsulation format of the MAC layer is an AMPDU. If yes, it is determined that the trigger frame does not include a packet extension field.
  • the target encapsulation format is an MPDU
  • the AP uses the HE PPDU physical layer to encapsulate the target MAC frame structure that carries the trigger frame, and the MAC layer of the HE PPDU adopts the target encapsulation format of the MPDU.
  • the target MAC frame structure includes the packet extension field or not needs to be determined according to whether the effective length of the target MAC frame structure satisfies a preset condition, and the preset condition is that the effective length of the target MAC frame structure is shorter than the length of the PPDU. position.
  • the MPDU encapsulation format when adopted, if the effective length of the MAC frame is less than the length of the PPDU, it needs to be complemented, that is, the MAC layer itself has the function of packet extension. Since the MPDU encapsulation format is used, the MPDU delimiter cannot be used without the MPDU delimiter. The usual way to do this is to use the Padding and/or FCS2 fields for MAC layer padding after FCS1. The use of Padding and/or FCS2 fields is referred to as a packet extension field. As shown in Figure 4, this is the hair A schematic diagram of a structure of an HE PPDU provided by the embodiment, where the target MAC frame structure of the PPDU adopts an MPDU encapsulation format.
  • the L-SIG length field in the L-Preamble in the PPDU is used to indicate The length of the PPDU
  • the effective trigger length field of the trigger frame is used to indicate the effective length of the trigger frame.
  • the cutoff position indicated by the effective length in the valid trigger length field is FCS1
  • the cutoff position indicated by the length of the PPDU in the length field of the PPDU is FCS2. It should be noted that if the packet extension field only includes Padding, the PPDU The cutoff position indicated by the length is Padding. If the packet extension field is not included, the cutoff position indicated by the length of the PPDU is FCS1, so it needs to be determined according to the specific situation.
  • the target type is an HE PPDU and the target encapsulation format is an MPDU
  • the PPDU includes a packet extension field that is used to indicate that the target MAC frame structure includes a packet extension field.
  • the indication information includes a third cut-off position indicated by a third end position indicated by a valid length field of the trigger frame and a length field indicated by a PPDU, wherein a byte between the fourth cut-off position and the third cut-off position The difference is greater than the preset threshold.
  • the PPDU includes indication information indicating that the target MAC frame structure does not include a packet extension field, where the indication information includes a fifth end position indicated by a valid length field of the trigger frame and a length of the PPDU. a sixth cut-off position indicated by the field, wherein a byte difference between the sixth cut-off position and the fifth cut-off position is less than or equal to a preset threshold.
  • the receiving station STA may determine, according to the byte difference between the cutoff position indicated by the length field (L-Length) in the L-SIG of the HE PPDU and the cut-off position indicated by the valid trigger length field of the trigger frame, whether the trigger frame includes the packet. no.
  • the trigger frame has no Padding and FCS2 fields; if the L-Length and the trigger frame are valid. If the position of the trigger length field is less than 4 bytes, the trigger frame includes the Padding field but does not include the FCS2 field; if the position of the L-Length and the valid trigger length field of the trigger frame is equal to 4 bytes, the The trigger frame contains a 4-byte Padding field or an FCS2 field; if the position of the L-Length and the valid trigger length field of the trigger frame is greater than 4 bytes, the trigger frame includes Padding at the same time. Field and FCS2 fields.
  • the preset threshold may also be other values, such as 1 byte, 2 bytes, etc., or a few bits, etc., and the invention is not limited.
  • FIG. 4a is a schematic structural diagram of a HE PPDU, where the target MAC frame structure of the PPDU adopts an MPDU encapsulation format, and only one FCS field is included for the trigger frame shown in FIG. 4a, and the L-SIG includes The end position indicated by the length field (L-Length) is the end position of the padding, and the end position indicated by the effective trigger length (Effective Trigger Length) field of the trigger frame is the site-by-site trigger information (Per STA Info). The end position of the field.
  • the preset threshold may be defined as the length of the FCS. If the position of the L-Length and the effective trigger length field of the trigger frame is different by the length of one FCS (for example, 4 bytes), the trigger frame does not have a Padding field; If the L-Length differs from the position of the valid trigger length field of the trigger frame by more than 4 bytes, the trigger frame has a Padding field.
  • the target type is HE PPDU and the target encapsulation format is MPDU
  • the target MAC frame structure includes a packet extension field
  • the PPDU includes a packet indicating that the target MAC frame structure includes a packet extension field. Instructing information, where the indication information includes a length value encapsulated in a valid length field of the trigger frame and belonging to a preset range;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include a packet extension field, where the indication information includes a length value encapsulated in a valid length field of the trigger frame that exceeds a preset range.
  • the length value exceeding the preset range may be a maximum receiving or sending MPDU length that is exceeded when the MPDU length specified by the current protocol or the capability interaction is notified.
  • the receiving station STA parses the valid length field of the trigger frame. If the valid length field of the triggering frame indicates a special length, such as exceeding the MPDU length specified by the current protocol or the maximum receiving or transmitting MPDU length notified during the capability interaction, the trigger frame There is no packet extension field; otherwise the trigger frame contains a packet extension field.
  • the AP encapsulates the target MAC frame structure carrying the trigger frame in the physical layer with the VHT type, and the VHT format must select the AMPDU, but the VHT format does not have the packet extension in the physical layer itself.
  • Packet Extension Packet Extension
  • the MAC layer adopts the target encapsulation format of the AMPDU, so there is no packet extension function in the MAC layer itself, but in order to enable the receiving station to have enough time to parse the trigger information, it is necessary to retain the packet extension field of the trigger frame itself (Padding and FCS2 fields). ), and the packet extension field of the trigger frame itself is used as the packet extension field of the target MAC frame structure.
  • FIG. 6 is a schematic diagram of a frame structure of an MPDU in an AMPDU encapsulation format according to an embodiment of the present invention. As shown in the figure, the frame structure includes a packet extension field (Padding and FCS2 fields) and an MPDU. Delimiter.
  • t (Padding field) + t (FCS2 field) + t (EOF complement) ⁇ receiving end The time to respond.
  • t(x) refers to the transmission time of the field x.
  • a typical value for the time at which the receiver reacts is 16us.
  • Other values such as 32us may also be used, depending on the data processing capability of the receiving end, and the present invention does not limit the time at which the receiving end reacts.
  • the PPDU includes indication information indicating that the target MAC frame structure includes a packet extension field, where the indication information includes a seventh cutoff position indicated by a valid trigger length field of the trigger frame and an eighth cutoff position indicated by an MPDU Delimiter of the AMPDU, where The seventh cut-off position is different from the eighth cut-off position.
  • the seventh cutoff position indicated by the effective trigger length field is FCS1
  • the eighth cutoff position is FCS2.
  • the receiving station STA compares the cut-off position indicated by the cut-off position indicated by the MPDU Length field and the valid trigger length field of the trigger frame in the MPDU Delimiter of the VHT PPDU to know whether the trigger frame includes the Padding and FCS2 fields.
  • 6A is a structure diagram of a target MAC frame in a VHT PPDU, where the target MAC frame structure adopts an AMPDU format, so the target MAC frame structure includes multiple MPDUs, and different MPDUs are separated by an MPDU Delimiter, and the target MAC frame structure has only one FCS. .
  • the VHT PPDU includes indication information indicating that the target MAC frame structure includes a packet extension field, the indication information including a seventh end position indicated by a valid trigger length field of the trigger frame And an eighth cutoff position indicated by an MPDU Delimiter of the AMPDU, wherein the seventh cutoff position is different from the eighth cutoff position.
  • the seventh end position indicated by the valid trigger length field is a site-by-site field (Per STA/Group info), and the eighth end position is FCS.
  • the receiving station STA compares the cut-off position indicated by the cut-off position indicated by the MPDU Length field in the MPDU Delimiter of the VHT PPDU and the valid trigger length field of the trigger frame to determine whether the trigger frame includes a Padding field.
  • FIG. 5 another frame structure diagram is provided in the embodiment of the present invention.
  • the length of time that the Padding and FCS2 fields are fixedly sent is the time at which the receiving end reacts, such as 16us.
  • the Padding and FCS2 fields are indicated; In the case of the HE PPDU and in the AMPDU format, it indicates that there are no Padding and FCS2 fields).
  • the indicator bit usually only needs 1 bit.
  • the information bit can be located in the Common Info field, but is not limited to the Common Info field.
  • the information bit may also have multiple bits, such as two bits, and then the length of the transmission time of the Padding field and the FCS2 field may be divided into four cases. Take the response time of the receiving end as 16us. The four cases can be 0*16us, 1/3*16us, 2/3*16us, 1*16us, where 0 is no Padding field. And the FCS2 field. If the information bit is three bits, eight time lengths can be indicated. The number of bits used is not limited herein.
  • the receiving station STA reads the packet extension information bit of the trigger frame. If the packet extension information bit indicates that there is no packet extension field after FCS1, the STA knows that the packet extension information bit indicates that there is no packet extension field after FCS1; if the packet extension information bit indicates that there is a packet extension field after FCS1, the STA learns that the packet extension information bit indicates FCS1. After the package extension field exists.
  • the trigger frame is the structure shown in FIG. 5a, and there is no effective trigger length (Effective Trigger Length) field in the trigger frame, and there is only one FCS in the trigger frame.
  • the length of time that the Padding and FCS fields are fixedly sent is the time at which the receiving end reacts, such as 16us.
  • only one information bit (packet extension information bit) is needed to indicate whether there is a Padding field (for example, in a legacy legacy PPDU or a high-throughput HT PPDU, the Padding field is indicated; and in the HE PPDU and In the case of the AMPDU format, it indicates that there is no Padding field).
  • the indicator bit usually only needs 1 bit.
  • the information bit can be located in the Common Info field, but is not limited to the Common Info field.
  • the information bit may also have multiple bits, such as two bits, and then the length of transmission time of the Padding field and the FCS field may be indicated to be divided into four cases. Take the response time of the receiving end as 16us. The four cases can be 0*16us, 1/3*16us, 2/3*16us, 1*16us, where 0 is no Padding field. And FCS fields. If the information bit is three bits, eight time lengths can be indicated. The number of bits used is not limited herein.
  • the receiving station STA reads the packet extension information bit of the trigger frame. If the packet extension information bit indicates that there is no packet extension field after the per-site trigger information field (Per STA Info), the STA knows that the packet extension information bit indicates that there is no packet extension field after the per-site trigger information field (Per STA Info); if the packet extension information The bit indicates that there is a packet extension field after the per-site trigger information field (Per STA Info), and the STA knows that the packet extension information bit indicates a packet extension field after the per-site trigger information field (Per STA Info).
  • a more general frame format that carries the trigger frame and supports Padding is proposed as the Padding Wrapper.
  • This format is an encapsulation format for Packet Extension and can be used for packet extension of any frame.
  • any of the frames can be placed in the Carried Frame. Field.
  • A1 is the receiving end address of the frame
  • A2 is the sending end address of the frame
  • the RA of the frame into A1 put the TA of the frame into A2, and put the Frame Control of the frame into the Carried Frame Control field of the encapsulation format.
  • the parts after the TA of the frame are all placed in the Carried Frame. That is, the cut-off position indicated by the Carried Frame Length is the position where the FCS of the frame ends.
  • Behind Padding And FCS2 is the time that the encapsulation format reacts to the receiving end for the receiving end, and its specific length is also affected by the L-length or MPDU Length or other values related to the length of the PPDU.
  • the trigger frame after the trigger frame is placed in the format, it will appear as a frame structure as shown in FIG.
  • the trigger frame shown in FIG. 3 is placed in the Carried Frame to obtain the frame structure shown in FIG. 8a.
  • the specific method is: put the RA of the frame into A1, put the TA of the frame into A2, and put the Frame Control of the frame into the Carried Frame Control field of the encapsulation format, after the TA of the frame is before the FCS Part of it is all placed in the Carried Frame. That is, the cut-off position indicated by the Carried Frame Length is the position where the per-site trigger information field (Per STA Info) of the frame ends.
  • the latter Padding and FCS are the time that the encapsulation format responds to the receiving end for the receiving end, and its specific length is also affected by the L-length or MPDU Length or other values related to the length of the PPDU.
  • a Carried Frame Control field is added to the trigger frame indication field with the packet extension function implemented by the encapsulation format, but the format can be applied to any PPDU that does not support packet extension at the physical layer, such as Legacy. PPDU, HT PPDU, VHT PPDU, etc.
  • the complementary encapsulation format can carry other frames in addition to the trigger frame, and any frame that needs the packet extension function can be placed in the Carried Frame field of the encapsulation format.
  • both A1 and A2 may exist or may exist partially, for example, only A2 does not have A1.
  • some information bits in the Frame Control may indicate whether A1 and A2 exist in the current frame. It is also possible to directly specify that only A1 or only A2 or both A1 and A2 are present in this format.
  • the receiving station STA receives the trigger frame carried in the packed encapsulation format, and reads the Carried Frame Control field in the packed encapsulation format to learn that the carried frame is a trigger frame, and further reads the Carried Frame Length field to learn that the trigger frame is valid. Trigger length.
  • the access point sends the PPDU.
  • the AP sends the PPDU carrying the trigger frame.
  • the HE PPDU may be a SU PPDU or a MU PPDU.
  • the trigger frame may be located on one or more subchannels.
  • the STA as the receiving end knows that the frame carried by the subchannel is a broadcast frame when reading its HE-SIG-B, and if it is determined that there is no such STA in the subchannels as the destination STA, the STA can read the broadcast frame.
  • the STA may further determine whether it is a trigger frame by reading a Frame Control field of the broadcast frame.
  • the access point generates a PPDU of a target type, where the PPDU includes a target MAC frame structure that carries a trigger frame generated by using a target encapsulation format, where the target MAC frame structure includes a packet extension field according to the target.
  • the type and the target encapsulation format are determined.
  • whether the target MAC frame structure includes a packet extension field by using a target type of the PPDU and a target encapsulation format of the target MAC frame structure carrying the trigger frame, thereby adapting to PPDUs of various version types.
  • FIG. 9 is a schematic block diagram of an apparatus for transmitting a frame in a wireless local area network according to an embodiment of the present invention.
  • the device is, for example, an access point, or a dedicated circuit or chip that implements related functions.
  • the access point 1000 includes a processor 1010, a memory 1020, a baseband circuit 1030, a radio frequency circuit 1040, and an antenna 1050.
  • the means for transmitting the frame may be the AP shown in FIG.
  • the AP communicates with STA1, STA2, and STA3.
  • the processor 1010 controls the operation of the access point 1000.
  • the memory 1020 can include read only memory and random access memory and provides instructions and data to the processor 1010, which can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic. Device. A portion of memory 1020 may also include non-volatile line random access memory (NVRAM).
  • the baseband circuit 1030 is used to synthesize the baseband signal to be transmitted or to decode the received baseband signal.
  • the radio frequency circuit 1040 is for modulating a low frequency baseband signal to a high frequency carrier signal, and a high frequency carrier signal is transmitted through the antenna 1050.
  • the radio frequency circuit is also used to demodulate the high frequency signal received by the antenna 1050 into a low frequency carrier signal.
  • the various components of station 1000 are coupled together by a bus 1060, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1060 in the figure. It should be noted that the foregoing description of the access point structure can be applied to subsequent embodiments.
  • the baseband circuit 1030 is configured to generate a physical layer protocol data unit PPDU of a target type, where the PPDU includes a target media access control that carries a trigger frame generated by using a target encapsulation format. a MAC frame structure, wherein whether the packet extension field is included in the target MAC frame structure is determined according to the target type and the target encapsulation format;
  • the RF circuit 1040 is configured to send the PPDU.
  • the target encapsulation format is an aggregate AMPDU
  • the packet extension field is not included in the target MAC frame structure
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes a first end position indicated by an effective trigger length field of the trigger frame and the AMPDU. a second cutoff position indicated by the MPDU Delimiter, wherein the first cutoff position is the same as the second cutoff position.
  • the packet extension field includes at least one of a Padding field and an FCS2 field;
  • the target encapsulation format is an MPDU
  • the target MAC frame structure determines, by the target MAC frame structure, whether the packet extension field is determined according to whether the HE PPDU type, the MPDU encapsulation format, and an effective length of the target MAC frame structure meet a preset condition, where the preset is The condition is that the effective length of the target MAC frame structure is less than the position of the length of the PPDU;
  • the target MAC frame structure includes the packet extension field
  • the target MAC frame structure does not include the packet extension field.
  • the PPDU includes indication information used to indicate that the target MAC frame structure includes the packet extension field.
  • the indication information includes a third cutoff position indicated by a valid end length field of the trigger frame and a fourth cutoff position indicated by a length field of the PPDU, wherein the fourth cutoff position and the third cutoff position The byte difference between the locations is greater than a preset threshold;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes that the trigger frame is valid.
  • a fifth end position indicated by the length field and the PPDU a sixth cutoff position indicated by the length field, wherein a byte difference between the sixth cutoff position and the fifth cutoff position is less than or equal to a preset threshold.
  • the PPDU includes indication information indicating that the target MAC frame structure includes the packet extension field, the indication The information includes a length value encapsulated in a valid length field of the trigger frame and belonging to a preset range;
  • the PPDU includes indication information indicating that the target MAC frame structure does not include the packet extension field, and the indication information includes that the trigger frame is valid.
  • the target type is a very high throughput VHT PPDU.
  • the target encapsulation format is an AMPDU;
  • the target MAC frame structure includes the packet extension field
  • the PPDU includes indication information indicating that the target MAC frame structure includes the packet extension field, where the indication information includes a seventh end position indicated by a valid trigger length field of the trigger frame and an MPDU of the AMPDU. An eighth cut-off position indicated by the Delimiter, wherein the seventh cut-off position is different from the eighth cut-off position.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • circuit in the terminal of the embodiment of the present invention can be combined, divided, and deleted according to actual needs.
  • the components of the microcontroller and the like may be implemented by using a general-purpose integrated circuit, such as a central processing unit (CPU), or an application specific integrated circuit (ASIC).
  • a general-purpose integrated circuit such as a central processing unit (CPU), or an application specific integrated circuit (ASIC).

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

Abstract

La présente invention porte, dans un mode de réalisation, sur un procédé et sur un appareil permettant de transmettre une trame dans un réseau local sans fil. Le procédé permettant de transmettre une trame dans un réseau local sans fil comprend les étapes suivantes : un point d'accès génère une unité de données de protocole de couche physique (PPDU pour Physical layer Protocol Data Unit) d'un type cible, l'unité PPDU comprenant une structure de trame de contrôle d'accès au support (MAC pour Medium Access Control) cible qui est générée dans un format d'encapsulation cible et qui supporte une trame de déclenchement et, si un champ d'extension de paquet est inclus dans la structure de trame de contrôle MAC cible, il est déterminé en fonction du type cible et du format d'encapsulation cible ; le point d'accès envoie l'unité PPDU. Selon certains modes de réalisation de la présente invention, si un champ d'extension de paquet est inclus dans une structure de trame de contrôle MAC cible, il est déterminé en fonction d'un type cible et d'un format d'encapsulation cible d'une structure de trame de contrôle MAC cible supportant une trame de déclenchement, de sorte à s'adapter aux unités PPDU de différentes versions.
PCT/CN2016/104894 2015-12-31 2016-11-07 Procédé et appareil permettant de transmettre une trame dans un réseau local sans fil Ceased WO2017113989A1 (fr)

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EP16880780.8A EP3382925B1 (fr) 2015-12-31 2016-11-07 Procédé et appareil permettant de transmettre une trame dans un réseau local sans fil
US16/019,295 US10764413B2 (en) 2015-12-31 2018-06-26 Frame transmission method and apparatus in wireless local area network

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CN201511032182 2015-12-31
CN201610082069.2A CN106936553B (zh) 2015-12-31 2016-02-05 一种无线局域网中帧传输的方法及装置
CN201610082069.2 2016-02-05

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