WO2017004779A1 - Procédé de transmission d'une trame de données et dispositif l'utilisant - Google Patents

Procédé de transmission d'une trame de données et dispositif l'utilisant Download PDF

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Publication number
WO2017004779A1
WO2017004779A1 PCT/CN2015/083413 CN2015083413W WO2017004779A1 WO 2017004779 A1 WO2017004779 A1 WO 2017004779A1 CN 2015083413 W CN2015083413 W CN 2015083413W WO 2017004779 A1 WO2017004779 A1 WO 2017004779A1
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Prior art keywords
data frame
data
field
indication information
service field
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PCT/CN2015/083413
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English (en)
Chinese (zh)
Inventor
林梅露
郭宇宸
于健
杨讯
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华为技术有限公司
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Priority to PCT/CN2015/083413 priority Critical patent/WO2017004779A1/fr
Publication of WO2017004779A1 publication Critical patent/WO2017004779A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices

Definitions

  • the present invention relates to the field of information processing technologies, and in particular, to a method and an apparatus for transmitting a data frame.
  • the 802.11ax protocol is a protocol developed by the IEEE (Chinese: Institute of Electrical and Electronics Engineers) for wireless local area networks.
  • APs using the 802.11ax protocol Choinese: Access Point; English: Access Point
  • STAs Chinese: Site; English: Station
  • FIG. 1 the data frame structure transmitted between the AP and the plurality of STAs is as shown in FIG. 1 , wherein the efficient signaling field A (hereinafter referred to as HE-SIGA) and Efficient signaling field B (hereafter denoted by HE-SIGB) may be used to carry signaling information in the data frame structure of the 802.11ax protocol.
  • the structure of the service field is as shown in FIG. 2.
  • the service field includes 16 bits: 7 bits are scrambling code initialization bits, and 9 bits are reserved bits.
  • the data in the data field of the data frame may be in the form of MPDU (Chinese: Medium Protocol Control Protocol Data Unit; English: MAC protocol data unit), or AMPDU (Chinese: Aggregated Medium Access Control Protocol Data Unit; English: Aggregation) MPDU) structure.
  • the AMPDU structure is shown in Figure 3.
  • the MPDU structure is shown in Figure 4.
  • the following information interaction may be performed between the AP and multiple STAs: 1) if the data in the data field of the data frame adopts the MPDU structure, the length of the MPDU structure needs to be transmitted between the AP and the multiple STAs; 2) the data of the data frame The compression of the MAC frame header contained in the field. 3) Specific information of the AP or specific information of each of the multiple STAs, for example, the STA notifies the AP of its cache information through a non-cached report frame or a dedicated cache report frame.
  • Embodiments of the present invention provide a method and an apparatus for transmitting a data frame, which improve data frame transmission.
  • a first aspect of the embodiments of the present invention provides a data frame transmission method, including:
  • the first electronic device generates a data frame, where the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame or a predetermined attribute of the first electronic device;
  • the first electronic device transmits the data frame to a second electronic device.
  • the indication information is carried on a reserved bit in the service field;
  • the indication information is carried on a partial scrambling code initialization bit in the service field and on a reserved bit in the service field.
  • the service field further carries a redundancy check code CRC of the indicated information
  • the data frame of the data frame includes a CRC carrying the indication information in a MAC frame header.
  • any one of the first possible implementation of the first aspect and the second possible implementation of the first aspect in a third possible implementation of the first aspect, adopts a medium access control protocol data unit MPDU structure, and the predetermined attribute of the data frame is length information of the MPDU structure.
  • the predetermined attribute of the data frame is the compression information of the MAC frame header included in the data field of the data frame.
  • a particular bit in the service field characterizes whether the service field contains the indication information.
  • the high-efficiency signaling field included in the data frame carries a first identifier for characterizing whether data in the data field of the data frame adopts an aggregated medium access control protocol data unit AMPDU structure,
  • the efficient signaling field further identifies whether the service field includes the indication information based on the first identity;
  • the legacy signaling field included in the data frame carries a second identifier for characterizing whether the data in the data field of the data frame adopts an AMPDU structure
  • the legacy signaling field is characterized by the second identifier Whether the service field contains an indication of the indication information.
  • the indication information is cache information of the first electronic device.
  • the data frame is a data frame based on the 802.11ax protocol.
  • the first electronic device is an access point AP, and the second electronic device is a station STA; or
  • the second electronic device is an AP.
  • a second aspect of the embodiments of the present invention provides an apparatus for transmitting a data frame, including:
  • a generating unit configured to generate a data frame, where the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame or a predetermined attribute of the device;
  • a sending unit configured to send the data frame.
  • the indication information is carried on a reserved bit in the service field.
  • the indication information is carried on a partial scrambling code initialization bit in the service field and on a reserved bit in the service field.
  • the service field further carries a redundancy check code CRC of the indicated information
  • the data frame of the data frame includes a CRC carrying the indication information in a MAC frame header.
  • any one of the first possible implementation of the second aspect and the second possible implementation of the second aspect in a third possible implementation of the second aspect, adopts a medium access control protocol data unit MPDU structure, and the predetermined attribute of the data frame is length information of the MPDU structure.
  • the predetermined attribute of the data frame is the compression information of the MAC frame header included in the data field of the data frame.
  • a particular bit in the service field characterizes whether the service field contains the indication information.
  • the high efficiency signaling field included in the data frame carries a first identifier for characterizing whether the data in the data field of the data frame adopts an aggregate medium access control protocol data unit AMPDU structure, and the high efficiency signaling field is further based on Determining, by the first identifier, whether the service field includes the indication information; or
  • the legacy signaling field included in the data frame carries a second identifier for characterizing whether the data in the data field of the data frame adopts an AMPDU structure
  • the legacy signaling field is characterized by the second identifier Whether the service field contains an indication of the indication information.
  • the indication information is cache information of the device.
  • the data frame is a data frame based on the 802.11ax protocol.
  • the device is an access point AP or a station STA.
  • the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame transmitted between the first electronic device and the second electronic device, or indicates a predetermined parameter of the first electronic device,
  • the interaction between the first electronic device and the second electronic device is transmitted by using the service field in the data frame, thereby increasing the amount of information transmitted by the data frame.
  • 1 is a schematic diagram of a data frame structure of an 802.11ax protocol
  • FIG. 2 is a schematic diagram showing the structure of a service field in a data frame of the 802.11ax protocol
  • FIG. 3 is a schematic diagram of an AMPDU structure
  • FIG. 5 is a schematic diagram of a possible communication system suitable for the method of transmitting a data frame in this embodiment
  • FIG. 6 is a flowchart of a method for transmitting a data frame in an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of an apparatus for transmitting a data frame according to an embodiment of the present invention.
  • FIG. 8 is a hardware structural diagram of an apparatus for transmitting a data frame according to an embodiment of the present invention.
  • FIG. 5 is a possible communication system applicable to the data frame transmission method in this embodiment.
  • the communication system includes: an AP, multiple STAs, and multiple STAs are scheduled by the AP, where the STA may be
  • the scheduled station can also be a single user to obtain channel transmission opportunities through competition.
  • FIG. 6 is a flowchart of a method for transmitting a data frame according to an embodiment of the present invention. The method includes:
  • Step 61 The first electronic device generates a data frame, where the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame or a predetermined parameter of the first electronic device.
  • Step 62 The first electronic device sends the data frame to a second electronic device.
  • the data frame is a data frame based on the 802.11ax protocol.
  • the embodiment of the present invention provides that the service field of the data frame that uses the 802.11ax protocol carries the AP and the STA indication information, and the data frame that carries the indication information may be generated by the AP, or may be generated by the STA.
  • the AP sends the data frame carrying the indication information to the STA after the data frame carrying the indication information is generated, if the data frame carrying the indication information is generated by the STA, After generating the data frame carrying the indication information, the STA sends the data frame carrying the indication information to the AP.
  • the predetermined attribute of the data frame is length information of the MPDU structure
  • the AP or the STA uses the service field to carry the length information of the MPDU structure.
  • the first specific implementation manner is: the length information of the MPDU structure is carried in the reserved bits in the service field.
  • the second specific implementation manner is: the length information of the MPDU structure is carried on the partial scrambling code initialization bit in the service field and the reserved bit in the service field.
  • the structure of the MPDU has no delimiter. Therefore, the embodiment of the present invention proposes to use a part of bits in the service field to indicate the length of the MPDU structure.
  • the service field of the data frame of the 802.11ax protocol includes 9 reserved bits, and 9 or less reserved bits can be used to carry the length information of the MPDU structure. It can also be seen from FIG. 2 that the service field of the data frame of the 802.11ax protocol further includes 7 scrambling code initialization bits. If the 9 reserved bits are not enough to carry the length information of the MPDU structure, it can also be initialized by using 7 scrambling codes. Part of the bits and 9 reserved bits together carry the length information of the MPDU structure.
  • the first implementation is mainly for short frames in which the data adopts an MPDU structure, and the short frames may be short data frames, control frames, and the like.
  • the service field further carries a redundancy check code CRC of the indication information; or a MAC frame header included in a data field of the data frame carries a CRC of the indication information.
  • the CRC bit of the length information of the MPDU structure is also transmitted while transmitting the length information of the MPDU structure.
  • CRC bits of the length information of the MPDU can be selected from the 9 reserved bits of the service field and the partial scrambling code initialization bits.
  • the CRC bits of the length information of the MPDU are directly learned by the selected bits, or the CRC bits of the length information of the MPDU are indirectly obtained by analyzing the selected bits.
  • Another implementation manner is: carrying the CRC bit of the length information of the MPDU in the MAC frame header included in the data field of the data frame.
  • the CRC bit of the length information of the MPDU is directly learned by the MAC frame header, or the CRC bit of the length information of the MPDU is indirectly obtained by analyzing the MAC frame header.
  • the MAC frame header is as shown in FIG. 4, for example, a CRC bit that can carry the length information of the MPDU in the duration/identification field of the MAC frame header.
  • the predetermined attribute of the data frame is compression information of a MAC frame header included in a data field of the data frame
  • the service field carries compression information of a MAC frame header included in a data field of the data frame
  • the data transmitted between the AP and the STA adopts an MPDU structure or an AMPDU structure.
  • the AP or STA uses the service field in the data frame to carry the compressed information of the MAC frame header of the data.
  • the first specific implementation manner is: the reserved information in the service field or the compression information of the MAC frame header carried by the partial reserved bits.
  • the second specific implementation manner is that the partial scrambling code initialization bit and the reserved bit in the service field carry the compression information of the MAC frame header.
  • OFDMA Orthogonal Frequency Division Multiplexing
  • AP Access Point; English: Access Point
  • the bandwidth is divided into a plurality of subchannels, and data is simultaneously transmitted to a plurality of STAs through a plurality of subchannels (Chinese: Site; English: Station).
  • Data transmission can be realized by using OFDMA.
  • each STA has to transmit a MAC frame header, and therefore, the overhead of the MAC frame header is multiplied. Therefore, for the information carried in the PPDU (Physical Layer Protocol Data Unit), compression or deletion is performed, thereby reducing the overhead of the MAC frame header. Therefore, the embodiment of the present invention proposes to use a part of bits in the service field to indicate compression information of the MAC frame header included in the data field of the data frame.
  • the service field of the data frame of the 802.11ax protocol includes 9 reserved bits, and the compression information of the MAC frame header can be carried by 9 or less reserved bits. It can also be seen from FIG. 2 that the service field of the data frame of the 802.11ax protocol further includes 7 scrambling code initialization bits. If the 9 reserved bits are insufficient to carry the compressed information of the MAC frame header of the data, 7 can also be utilized. The partial bits in the scrambling code initialization bits and the 9 reserved bits together carry the compression information of the MAC frame header.
  • the compression information of the MAC frame header described in the second implementation includes whether the MAC frame header is compressed and which fields in the MAC frame header are compressed.
  • One implementation is to use the reserved bits in the service field for bit mapping, one reserved bit corresponding to a field in the MAC frame header. If the reserved bit is 1, it indicates that the field corresponding to the reserved bit is not compressed, and if the reserved bit is 0, it indicates that the field corresponding to the reserved bit is compressed. Or if the reserved bit is 0, it indicates that the domain corresponding to the reserved bit is not compressed, and if the reserved bit is 1, it indicates that the domain corresponding to the reserved bit is compressed.
  • the receiving end knows which fields in the MAC frame header are compressed by reading the reserved bits.
  • the receiving end can be an AP or an STA, if The AP sends a data frame to the STA, and the receiving end is the STA. If the STA sends the data frame to the AP, the receiving end is the AP.
  • the reserved bits in the service field and the partial scrambling code initialization bits for bit mapping are also possible.
  • the service field further carries a redundancy check code CRC of the indication information; or a CRC in the MAC frame header that carries the indication information.
  • the CRC bit of the compression information of the MAC frame header is also transmitted while transmitting the compression information of the MAC frame header.
  • the specific implementation is similar to the CRC bit of the length information of the MPDU structure, and will not be described here.
  • the predetermined parameter of the first electronic device is cache information of the STA or the AP
  • the service field carries the cache information of the STA or the AP.
  • the STA uses the service field in the data frame to carry the cache information of the STA
  • the AP uses the service field in the data frame to carry the cache information of the AP.
  • the first specific implementation manner is: the reserved bit in the service field carries the cache information of the STA or the AP.
  • the second specific implementation manner is that the partial scrambling code initialization bit and the reserved bit in the service field carry the cache information of the STA or the AP.
  • the AP schedules the STA according to the cache information of each STA of the multiple STAs. Therefore, before the AP transmits data to the STA, the AP needs to obtain the cache information of each STA. Of course, the STA may also need to obtain the cache information of the AP. Therefore, the embodiment of the present invention proposes to use a part of bits in the service field to indicate the cache information of the STA or the AP.
  • the service field of the data frame of the 802.11ax protocol includes 9 reserved bits, and 9 or less reserved bits can be used to carry the cache information of the STA or the AP. It can also be seen from FIG. 2 that the service field of the data frame of the 802.11ax protocol further includes 7 scrambling code initialization bits. If the 9 reserved bits are insufficient to carry the buffer information of the STA or the AP, 7 scrambling codes can also be utilized. The partial bits in the initialization bit and the 9 reserved bits together carry the cache information of the STA or the AP.
  • the cache information described in the third implementation may also be replaced by: some power saving parameters, for example, how many spatial streams or bandwidths that the AP or STA can receive.
  • CRC bits can be selected from all available bits to transmit CRC bits, which protect the cached information.
  • the CRC bits are carried in the MAC frame header for transmission.
  • An implementation manner is: when the sending end sends some non-cached reporting frames, if there is still data to be transmitted later, the buffering information may be carried in the service field and reported to the receiving end. If the sender is an STA, the receiver is an AP, and the STA sends a non-cached report frame to the AP. If the sender is an AP, the receiver is a STA, and the AP sends a non-cached report frame to the STA.
  • the available bits of the service field refer to: reserved bits of the service field, or reserved bits of the service field plus partial scrambling code initialization bits.
  • a larger granularity is used to indicate cache information, for example, in units of 10 bytes, or units of 100 bytes. Or first indicate what the granularity is, and then indicate what the cache is under that granularity.
  • the service field further carries a redundancy check code CRC of the indicated information; or a data frame included in a data field of the data frame carries a CRC of the indication information.
  • the CRC bits of the cache information are also transmitted while the cache information is transmitted.
  • the specific implementation is similar to the CRC bit of the length information of the MPDU structure, and will not be described here.
  • the embodiment of the present invention further provides that the service field is used to indicate whether the service field includes indication information or which indication information is included.
  • a first implementation is that a particular bit in the service field characterizes whether the service field contains the indication information, or a particular bit in the service field characterizes the type of the indication information.
  • any of the available bits of the service field is used to indicate whether the service field contains indication information or which indication information is included.
  • the available bits of the service field refer to: reserved bits of the service field, or reserved bits of the service field plus partial scrambling code initialization bits.
  • the 8th bit of the service field ie, bit7 is used to indicate whether the service field contains indication information or which indication information is included.
  • the service field in the data frame structure of the default 802.11ax includes the indication information, it is not necessary to use a bit in the service field to indicate whether the service field contains the indication information, and directly use a bit in the service field to indicate that the service field contains Which kind of indication information.
  • the second implementation manner is: if the high-efficiency signaling field included in the data frame carries a first identifier for characterizing whether the data in the data field of the data frame uses the aggregated medium access control protocol data unit AMPDU structure, The efficient signaling field further indicates whether the service field includes the indication information based on the first identifier; or if a traditional signaling field included in the data frame carries a data field used to represent the data frame Whether the data adopts the second identifier of the AMPDU structure, the legacy signaling field is based on the second identifier to indicate whether the service field includes an indication of the indication information.
  • the HE-SIG field carries the first identifier for indicating whether the data in the data field of the data frame adopts the AMPDU structure
  • the HE-SIG can be utilized.
  • the first identifier in the field simultaneously indicates whether the service field contains the indication information or the indication service field contains which indication information, so that by analyzing the HE-SIG field, two aspects of information can be obtained, and the first aspect information is the data of the data frame. Whether the data in the field adopts an AMPDU structure, and the second aspect information is whether the service field contains indication information or which indication information is included.
  • the traditional signaling field of the data frame (represented by the L-SIG field below) carries a second identifier for characterizing whether the data in the data field of the data frame adopts the AMPDU structure
  • the first in the L-SIG field can be utilized.
  • the second identifier indicates whether the service field contains an indication or indication of the indication information. Indicates which indication information is included in the service field.
  • the first aspect information is whether the data adopts an AMPDU structure
  • the second aspect information is whether the service field contains indication information. Or which kind of instructions are included.
  • the service field in the data frame structure of the default 802.11ax includes the indication information, it is not necessary to use the HE-SIG field to indicate whether the service field contains the indication information, and directly use the HE-SIG field to carry the indication information of the service field.
  • the service field in the data frame structure of the default 802.11ax includes the indication information, it is not necessary to use the L-SIG field to carry the indication that the service field carries the indication information, and directly use the L-SIG field to carry the carried service field.
  • An indication of which indication information is not necessary to use the HE-SIG field to indicate whether the service field contains the indication information, and directly use the HE-SIG field to carry the indication information of the service field.
  • FIG. 7 is a structural block diagram of a data transmission apparatus according to an embodiment of the present invention.
  • the device includes:
  • a generating unit 420 configured to generate a data frame, where the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame or a predetermined attribute of the device;
  • the sending unit 421 is configured to send the data frame.
  • the indication information is carried in a reserved bit in the service field.
  • the indication information is carried on a partial scrambling code initialization bit in the service field and on a reserved bit in the service field.
  • the service field further carries a redundancy check code CRC of the indication information
  • the MAC frame header of the data carries the CRC of the indication information.
  • the service field further carries a redundancy check code CRC of the indicated information
  • the data frame of the data frame includes a CRC carrying the indication information in a MAC frame header.
  • the data in the data field of the data frame adopts a medium access control protocol data unit MPDU structure, and a predetermined attribute of the data frame is length information of the MPDU structure.
  • the predetermined attribute of the data frame is compression information of a MAC frame header included in a data field of the data frame.
  • the specific bit in the service field indicates whether the service field includes the indication information.
  • the data frame includes an efficient signaling field carrying a first identifier that is used to identify whether the data in the data field of the data frame uses an aggregated medium access control protocol data unit AMPDU structure
  • the high efficiency The signaling field further identifies, based on the first identity, whether the service field includes the indication information
  • the legacy signaling field included in the data frame carries a second identifier for characterizing whether the data in the data field of the data frame adopts an AMPDU structure
  • the legacy signaling field is characterized by the second identifier Whether the service field contains an indication of the indication information.
  • the predetermined parameter of the device is cache information of the device.
  • the data frame is a data frame based on the 802.11ax protocol.
  • the device is an access point AP or a station STA.
  • FIG. 8 is a schematic structural diagram of hardware of an apparatus for transmitting data according to an embodiment of the present invention.
  • the device includes:
  • the processor 431 is configured to generate a data frame, where the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame or a predetermined attribute of the device;
  • the transmitter 432 is configured to send the data frame.
  • the indication information is carried in a reserved bit in the service field.
  • the indication information is carried on a partial scrambling code initialization bit in the service field and on a reserved bit in the service field.
  • the service field further carries a redundancy check code CRC of the indication information
  • the MAC frame header of the data carries the CRC of the indication information.
  • the service field further carries a redundancy check code CRC of the indicated information
  • the data frame of the data frame includes a CRC carrying the indication information in a MAC frame header.
  • the data in the data field of the data frame adopts a medium access control protocol data unit MPDU structure, and a predetermined attribute of the data frame is length information of the MPDU structure.
  • the predetermined attribute of the data frame is compression information of a MAC frame header included in a data field of the data frame.
  • the specific bit in the service field indicates whether the service field includes the indication information.
  • the data frame includes an efficient signaling field carrying a first identifier that is used to identify whether the data in the data field of the data frame uses an aggregated medium access control protocol data unit AMPDU structure
  • the high efficiency The signaling field further identifies, based on the first identity, whether the service field includes the indication information
  • the legacy signaling field included in the data frame carries a second identifier for characterizing whether the data in the data field of the data frame adopts an AMPDU structure
  • the legacy signaling field is characterized by the second identifier Whether the service field contains an indication of the indication information.
  • the predetermined parameter of the device is cache information of the device.
  • the data frame is a data frame based on the 802.11ax protocol.
  • the device is an access point AP or a station STA.
  • bus 430 can include any number of interconnected buses and bridges, and bus 430 will include one or more processors and memory 434 represented by processor 431. The various circuits of the memory are connected together.
  • the bus 430 can also couple various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 433 provides an interface between bus 430 and transmitter 432.
  • Transmitter 432 can be a transceiver that provides means for communicating with various other devices on a transmission medium.
  • the processor 431 is responsible for managing the bus 430 and the usual processing, and the memory 434 can be used to store data used by the processor 431 in performing the operations.
  • the access point AP may be a wireless router, a hotspot, or an electronic device with hotspot functions. Such as mobile phones, tablets.
  • the service field of the data frame carries indication information, where the indication information is used to indicate a predetermined attribute of the data frame transmitted between the first electronic device and the second electronic device, or indicates a predetermined parameter of the first electronic device,
  • the interaction between the first electronic device and the second electronic device is transmitted by using the service field in the data frame, thereby increasing the amount of information transmitted by the data frame.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

La présente invention concerne un procédé de transmission d'une trame de données et un dispositif l'utilisant. Le procédé consiste : à générer, par un premier appareil électronique, une trame de données contenant des informations d'indication dans un champ de service de la trame de données, les informations d'indication étant utilisées pour indiquer un attribut prédéfini de la trame de données ou un paramètre prédéfini du premier appareil électronique ; et à transmettre, par le premier appareil électronique, la trame de données à un second appareil électronique.
PCT/CN2015/083413 2015-07-06 2015-07-06 Procédé de transmission d'une trame de données et dispositif l'utilisant WO2017004779A1 (fr)

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