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    • 专利摘要:
    method and equipment for transmitting and receiving data on a wireless local area network. The present invention relates to a method and apparatus for transmitting and receiving data. A method of transmitting data from a sending terminal to a receiving terminal of a minimal system with a variable frequency band, according to an embodiment of the present invention, comprises: repeatedly generating a signal field according to a band of frequency; frequency that is applied to the transmission of a data frame, generating a data field, including the data; generating a data frame, including the signal field and the data field, and transmitting the data frame to the receiving terminal. The present invention is advantageous in that a field of signals that is transmitted together with the data to be transmitted from the sending end to the receiving end in the mimo system can be sent more efficiently.
    公开号:BR112012022749B1
    申请号:R112012022749-1
    申请日:2011-03-11
    公开日:2021-09-14
    发明作者:Jong-Ee Oh；Minho Cheong；Sok-Kyu Lee
    申请人:Electronics And Telecommunications Research Institute；
    IPC主号:
    专利说明:

    DESCRIPTIVE REPORT Technical Field
    [001] The present invention relates to a method and apparatus for transmitting and receiving data and, more particularly, to a method and apparatus for transmitting and receiving data from a multiple input and multiple output (MIMO) system. Foundation of Technique
    [002] A wireless local area network (WLAN) basically supports a basic set of services (BSS) mode, including an access point (AP) that serves as a connection point for the distribution system (DS) and a plurality of stations (STAs), however, not APs, or an independent BSS mode (IBSS), including only the stations (STAs) (hereinafter, AP and STA will be referred to as a "terminal").
    [003] In a wireless communication system using multiple antennas, that is, a MIMO system, a channel capacity is increased according to the increase in the number of antennas, and the frequency efficiency can be increased in this way. The MIMO system can be classified into two types of systems: the first is a single-user (SU)-MIMO, in which multiple streams are transmitted only for a single user, and the second, is a multi (MU)-MIMO -user where multiple streams are transmitted to multiple users, canceling the interference between users by an AP.
    [004] The MU-MIMO is advantageous in that it can even obtain a multi-user diversity gain, along with the increase in channel capacity. Furthermore, the MU-MIMO scheme can simultaneously transmit multiple streams from multiple users using the same frequency band, increasing throughput compared to an existing communication system. In general, the throughput of the wireless communication system can be increased by increasing the frequency band, but a system cost is disadvantageously increased in accordance with increasing the frequency band. Meanwhile, the MU-MIMO scheme does not increase the frequency band, but its complexity drastically increases compared to the existing communication scheme. Thus, in standard such as 802.11ac, methods for simultaneously employing the MU-MIMO technique while using a variable frequency according to a surrounding situation have been researched.
    [005] In the wireless communication system, in which multiple antenna streams are transmitted simultaneously to multiple users using a variable frequency band, a data field and a signal field, including information about the corresponding data field are transmitted. The signal field is divided into the following two types of fields. The first is a common signal field, including information commonly applied to users. The second is a dedicated signal field including information applied individually to each user. The common signal field can be recognized by every user who belongs to a common user group or who cannot belong to the common user group. In addition, the common signal field is used for automatic detection to discriminate why the communication system of a transmitted data frame was generated (that is, it is used for automatic detection to discriminate a communication system through which a transmitted data packet has been generated), so the common signal field needs to be compatible. Thus, there is a limitation in changing the format or configuration of the common signal field.
    [006] The common signal field is transmitted through a simple iterative structure for an SNR gain and a frequency diversity gain. However, the dedicated signal field cannot obtain the SNR gain and the frequency diversity gain, although such a simple iterative structure as that of the common signal field is used. Revelation Technical problem
    [007] The present invention provides a method and apparatus for effectively transmitting a field of the signal that is transmitted together when a transmitting terminal transmits data to a receiving terminal of a multiple input, multiple output system ( MIMO).
    [008] The above and other objectives, features, aspects and advantages of the present invention will be understood and will become more apparent from the following detailed description of the present invention. Furthermore, it can be easily understood that the objectives and advantages of the present invention can be realized by the units and their combinations recited in the Claims. Technical Solution
    [009] In one aspect, a method for transmitting data by a transmit terminal to a receiving terminal of a multiple input, multiple output (MIMO) system using a variable frequency band iteratively includes generating a field according to a frequency band applied to transmitting a data frame, generating a data field, including the data, generating a data frame, including the signal field and the data field, and transmission of the data frame to the receiving terminal.
    [0010] In another aspect, a method for receiving data via a receiving terminal of a transmitting terminal in a multiple input multiple output (MIMO) system using a variable frequency band includes receiving a data frame including a signal field and a data field, and obtaining data included in the data field, using the signal field, wherein the signal field is iteratively included in the signal field in accordance with a frequency band applied to frame transmission of data.
    [0011] In another aspect, a transmission device transmitting data to a receiving terminal of a multiple input multiple output (MIMO) system using a variable frequency band includes an iteratively generating signal field generation unit a signal field according to a frequency band applied to the transmission of a data frame, a data field generating unit generating a data field including the data, a data frame generating unit generating a frame of data, including the signal field and the data field, and a transmission unit that transmits the data frame to the receiving terminal.
    [0012] In another aspect, a receiving device receiving data from a transmit terminal in a multiple input multiple output (MIMO) system using a variable frequency band includes a receiving unit receiving a data frame including a field of signal and a data field, and a data acquisition unit obtaining the data included in the data field by using the signal field, the signal field being iteratively included in the signal field in accordance with an applied frequency band to the transmission of the data frame. Advantageous Effects
    [0013] According to the embodiments of the present invention, a signal field, which is transmitted together when a transmitting terminal transmits data to a receiving terminal in a MIMO system, can be effectively transmitted.
    [0014] Also, in transmitting a dedicated signal field in the MU-MIMO system, the performance of the signal field is enhanced and a transmission time is reduced by using a user frequency band and the number of streams, per means by which a large amount of information can be effectively transmitted by using the signal field. Description of Drawings
    [0015] FIG. 1 shows the structure of a data frame used in a data transmission/reception method according to an embodiment of the present invention.
    [0016] FIG. 2 shows a modality in which an access point (AP) transmits four streams through MUMIMO beamforming using four antennas in an 80 MHz frequency band and two stations (STA) receive the streams using two antennas, respectively.
    [0017] FIG. 3 shows the structure of a VHT-SIG B field when a station (STA) receives a stream in a 20 MHz frequency band.
    [0018] FIG. 4 shows the structure of a VHT-SIG B field when a station (STA) receives four streams in a 20 MHz frequency band.
    [0019] FIG. 5 shows the structure of a VHT-SIG B field when a station (STA) receives four streams in a frequency band of 80 MHz.
    [0020] FIG. 6 shows the structure of a VHT-SIG B field having two symbols when a station (STA) receives a stream in a 20 MHz frequency band.
    [0021] FIG. 7 shows the structure of a VHT-SIG B field having two symbols when a station (STA) receives four streams in a 20 MHz frequency band.
    [0022] FIG. 8 shows the structure of a VHT-SIG B field having a symbol when a station (STA) receives four streams in a 20 MHz frequency band.
    [0023] FIG. 9 shows an embodiment in which SIG Bs are transmitted over two symbols in a manner similar to that of a VHT-SIG A when a station (STA) receives a stream in a 40 MHz frequency band.
    [0024] FIG. 10 shows the structure of a VHT-SIG B field having a symbol when a station (STA) receives a stream in a 40 MHz frequency band.
    [0025] FIG. 11 shows an embodiment of an application of a data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 20 MHz frequency band.
    [0026] FIG. 12 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 20 MHz frequency band.
    [0027] FIG. 13 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band.
    [0028] FIG. 14 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a 40 MHz frequency band.
    [0029] FIG. 15 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 40 MHz frequency band.
    [0030] FIG. 16 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 40 MHz frequency band.
    [0031] FIG. 17 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a frequency band of 80 MHz.
    [0032] FIG. 18 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a frequency band of 80 MHz.
    [0033] FIG. 19 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a frequency band of 80 MHz.
    [0034] FIG. 20 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz.
    [0035] FIG. 25 shows an application modality of the data transmission method according to the present invention for a case in which data is transmitted through two non-contiguous multichannels in a frequency band of 80 MHz.
    [0036] FIG. 26 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted over three non-contiguous multichannels in a frequency band of 80 MHz.
    [0037] FIG. 27 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted by using a QPSK symbol in a 20 MHz frequency band.
    [0038] FIG. 28 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted by using a QPSK symbol in a 40 MHz frequency band.
    [0039] FIG. 29 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted by using a QPSK symbol in a frequency band of 80 MHz.
    [0040] FIG. 30 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted over two non-contiguous multichannels by using a QPSK symbol in a frequency band of 80 MHz.
    [0041] FIG. 31 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted over three non-contiguous multi-channels by using a QPSK symbol in a frequency band of 80 MHz.
    [0042] FIG. 32 shows an application modality of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band 20 MHz.
    [0043] FIG. 33 shows an application embodiment of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band of 40 MHz.
    [0044] FIG. 34 shows an application modality of the data transmission method according to the present invention for a case in which one stream is transmitted by using two space-time streams in a 20 MHz frequency band.
    [0045] FIG. 35 shows an application modality of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band of 20 MHz.
    [0046] FIG. 36 shows an application embodiment of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band of 40 MHz.
    [0047] FIG. 37 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a 40 MHz frequency band.
    [0048] FIG. 38 shows an embodiment of an application of a data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 40 MHz frequency band.
    [0049] FIG. 39 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 40 MHz frequency band.
    [0050] FIG. 40 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band.
    [0051] FIG. 41 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a frequency band of 80 MHz.
    [0052] FIG. 42 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a frequency band of 80 MHz.
    [0053] FIG. 43 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a frequency band of 80 MHz.
    [0054] FIG. 44 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz.
    [0055] FIG. 45 shows a bit allocation of a VHT-SIG B when the VHT-SIG B has a length of 26 bits in a band of 20 MHz, has a length of 27 bits in a band of 40 MHz, and has a length of 29 bits in an 80 MHz band.
    [0056] FIG. 46 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band, when the bit numbers of VHT-SIG B are allocated as shown in FIG. 45.
    [0057] FIG. 47 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band, when the bit numbers of VHT-SIG B are allocated as shown in FIG. 45.
    [0058] FIG. 48 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz, when the bit numbers of VHT-SIG B are allocated as shown in FIG. 45.
    [0059] FIG. 49 shows a modality in which the VHT-SIG B has a length of 26 bits in a 20 MHz band, 27 bits in a 40 MHz band, and 29 bits in an 80 MHz band, and some of the reserved bits included in a service field are used as CRC bits.
    [0060] FIG. 50 shows a bit allocation of VHT-SIG B when VHT-SIG B has a length of 26 bits in a 20 MHz band, 27 bits in a 40 MHz band, and 29 bits in an 80 MHz band in SU -PASTE.
    [0061] FIG. 51 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band, when the bit numbers of VHT-SIG B are allocated as shown in FIG. 50.
    [0062] FIG. 52 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band, when the bit numbers of VHT-SIG B are allocated as shown in FIG. 50.
    [0063] FIG. 53 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz, when the bit numbers of VHT-SIG B are allocated as shown in FIG. 50.
    [0064] FIG. 54 shows a modality in which the VHT-SIG B has a length of 26 bits in a 20 MHz band, 27 bits in a 40 MHz band, and 29 bits in an 80 MHz band, and some of the reserved bits included in a service field are used as CRC bits.
    [0065] FIG. 55 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band, when the cyclic delay diversity (CDD) technique ) is used and different delay is applied to each antenna.
    [0066] FIG. 56 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band, when a CDD technique is used and different delay is applied to each antenna.
    [0067] FIG. 57 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz, when a CDD technique is used and different delay is applied to each antenna.
    [0068] FIG. 58 shows the configuration of a transmission terminal in accordance with an embodiment of the present invention.
    [0069] FIG. 59 shows the configuration of a receiving terminal in accordance with an embodiment of the present invention. Mode of Invention
    [0070] The above and other objectives, features, advantages and aspects of the present invention will be described in detail in conjunction with the accompanying drawings, and therefore a person skilled in the art to which the present invention belongs will be readily able to implement the technical concept of the present invention. In describing the present invention, if a detailed explanation for a related known function or construction is considered to unnecessarily deviate from the essence of the present invention, such explanation will be omitted, but would be understood by those skilled in the art. Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like numbers refer to like elements in the drawings.
    [0071] FIG. 1 shows the structure of a data frame used in a data transmission/reception method according to an embodiment of the present invention.
    [0072] In FIG. 1, L-STF and L-LTF, training fields, and L-SIG, a signal field, are the same as a data frame used in an existing 802.11. The frame illustrated in FIG. 1 further includes dedicated fields for high speed wireless communication, i.e., very high throughput (VHT). VHT-STF and VHT-LTF are dedicated VHT training fields and VHT-SIG A and VHT-SIG B are dedicated VHT signal fields.
    [0073] The data frame of FIG. 1 includes VHT-DATA data fields including data transmitted to some users respectively. VHT-SIG B includes information relating to each of the data fields. For example, VHT-SIG B may include information regarding the length of useful data included in the VHT data field, information regarding the modulation coding scheme (MCS) of the VHT data field, and the like. Since the VHT-SIG B field includes information relating to each user, it corresponds to a dedicated signal field. Meanwhile, the VHT-SIG A field is a common transmitted signal field to be recognized by each user.
    [0074] FIG. 2 shows a modality in which an access point (AP) transmits four streams through MUMIMO Beamforming by the use of four antennas in an 80 MHz frequency band and two stations (STA) receive the streams by the use of two antennas, respectively.
    [0075] In the embodiment of FIG. 2, the VHT-SIG A field, a common signal field, is iterated four times so as to be transmitted as a stream, and MU-MIMO is not applied to this transmission. In FIG. 2, the presence of the L-SIG field in front of the VHT-SIG A field is to maintain backwards compatibility with the existing legacy equipment. A VHT-TF field is used to perform channel estimation using MU-MIMO beamforming, and can have a resolvable or non-resolvable form.
    [0076] VHT-SIG A includes the common information commonly applied to the two stations (STA). Also, VHT-SIG A, having a different structure than a signal field generated in the legacy equipment, is used for auto-detection of the VHT equipment. In this document, VHT-SIG A is simply interactively transmitted in 20 MHz frequency units, whereby both an SNR gain and a frequency diversity gain can be obtained.
    [0077] In comparison, VHT-SIG B, a dedicated signal field, including the information applied to each of the STA stations, is transmitted. Thus, VHT-SIG B does not need to be conveyed by using the simple iterative structure as VHT-SIG A does. Also, even when VHT-SIG B is transmitted by using simple iterative structure like VHT-SIG A, VHT-SIG B cannot obtain both an SNR gain and a frequency diversity gain.
    [0078] In order to solve the problems, the present invention provides a method, equipment, and a data field configuration capable of intensifying the transmission efficiency by using a new method, instead of the simple interactive method such as the VHT field - SIG A existing in the transmission of the VHG-SIG B field.
    [0079] FIG. 3 shows a structure of the VHT-SIG B field when a station (STA) receives a stream in a 20 MHz frequency band. In this document, the VHT-SIG B (referred to as a 'SIG B' hereinafter) is modulated from according to BPSK and has an OFDM symbol. In FIG. 3, since there is only one SIG B, it can be transmitted as is.
    [0080] FIG. 4 shows a structure of the VHT-SIG B field when a station (STA) receives four streams in a 20 MHz frequency band. In the embodiment of FIG. 4, four SIG Bs are transmitted. In this document, in the case where SIG B is transmitted in a simple interactive way like VHT-SIG A, if a particular OFDM subcarrier channel environment becomes worse in MU-MIMO beamforming, the four interactive bits they are all placed in the same situation. Thus, an SNR gain according to the four-stroke interaction can be obtained, but a frequency diversity effect cannot be obtained.
    [0081] Thus, in an embodiment of the present invention, different interleaving is applied to the SIG Bs from stream 1 to stream 4. When some bits of an encoded codeword of the SIG Bs are included in a different subcarrier of a different stream and transmitted, both the SNR gain and the frequency diversity gain can be obtained, improving the transmission performance.
    [0082] FIG. 5 shows a structure of the VHT-SIG B field when a station (STA) receives four streams in a frequency band of 80 MHz. In the embodiment of FIG. 5, although SIG B is simply iterated over a frequency band, both the SNR gain and the frequency diversity gain can be obtained. Thus, the maximum performance can be obtained by the simple iteration of the scheme applied to the four flows in the FIG modality. 4.
    [0083] The method described with reference to FIGS. 4 and 5 can be applied in the same way as to 40 MHz frequency band or 160 MHz band and when the number of streams is two or three.
    [0084] Meanwhile, the information included in the VHT-SIG B field needs to be stably transmitted compared to the information included in the VHT data field. So, in general, the VHT-SIG B field is transmitted by using a BPSK modulation and a low coding rate, or the like, and is thus protected. Then, the method described with reference to FIGS. 4 and 5 can protect VHT-SIG B more than necessary.
    [0085] In the case of VHT-SIG A, it must necessarily be recognized in 20 MHz units at a receiver (or a receiving end). Then, VHT-SIG A must be iteratively transmitted by a corresponding symbol length regardless of the number of symbols. However, iterative transmission of VHT-SIG B by a corresponding symbol length can be problematic in terms of upstream transmission performance and efficiency.
    [0086] FIG. 6 shows a structure of the VHT-SIG B field having two symbols when a station (STA) receives a stream in a 20 MHz frequency band. In FIG. 6, SIG B is modulated according to BPSK and has two OFDM symbols. In this document, since there is only one SIG B, it can be transmitted as is.
    [0087] FIG. 7 shows a structure of a VHT-SIG B field having two symbols when a station (STA) receives four streams in a 20 MHz frequency band. As the embodiment of FIG. 4, both SNR gain and frequency diversity gain can be obtained by applying different interleaving to the streams.
    [0088] However, if sufficient performance can be obtained without having to iterate through SIG B, the method of FIG. 7 may not be an effective transmission because SIG B is transmitted over two symbols. Then, the following transmission method is considered.
    [0089] FIG. 8 shows a structure of the VHT-SIG B field having a symbol when a station (STA) receives four streams in a 20 MHz frequency band. In the embodiment of FIG. 8, SIG B information, which occupied two symbols, when transmitted as a stream in the 20 MHz frequency band, can be effectively transmitted by only one symbol.
    [0090] When the frequency band applied to a transmission of a data frame is extended, a method similar to FIG. 8 can be considered. FIG. 9 shows an embodiment in which SIG Bs are transmitted over two symbols in a manner similar to that of a VHT-SIG A when a station (STA) receives a stream in a 40 MHz frequency band. In the embodiment of FIG. 9, since GIS Bs are transmitted over two symbols although sufficient performance can be obtained without iteration of GIS B, it is not effective.
    [0091] FIG. 10 shows a structure of the VHT-SIG B field having a symbol when a station (STA) receives a stream in a 40 MHz frequency band. 40 MHz frequency band can be effectively transmitted through a symbol.
    [0092] Thus, when the VHT-SIG B has two symbols when transmitted as a stream in the 20 MHz frequency band, even when the number of streams is increased or the frequency band extends, the VHT-SIG B can be effectively conveyed by the use of a symbol. Also, the previous methods can be extended as follows.
    [0093] FIG. 11 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 20 MHz frequency band. FIG. 12 shows an embodiment of applying the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 20 MHz frequency band. In the embodiment of FIG. 12, stream 3 is configured with B1 corresponding to an even numbered bit of a codeword of SIG B1 and B2 corresponding to an odd numbered bit of a codeword of SIG B2. Stream 3 transmitted reliably can be combined in one receiver.
    [0094] FIG. 13 shows an embodiment of applying the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band. In the embodiment of FIG. 13, SIG B1 is iterated on streams 1 and 3, and SIG B2 is iterated on streams 2 and 4. In this case, a simple iteration cannot obtain a frequency diversity gain, so different interleaving can be applied to each stream. in order to intensify the transmission performance as mentioned above.
    [0095] FIG. 14 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a 40 MHz frequency band. FIG. 15 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 40 MHz frequency band. FIG. 16 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 40 MHz frequency band. Different interleaving can be applied to each stream of FIGS. 14, 15, and 16.
    [0096] FIG. 17 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a frequency band of 80 MHz. FIG. 18 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a frequency band of 80 MHz. FIG. 19 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a frequency band of 80 MHz. FIG. 20 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz. Different interleaving can be applied to each stream of FIGS. 17, 18, 19, and 20.
    [0097] FIG. 21 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a frequency band of 160 MHz. FIG. 22 shows an application mode of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 160 MHz frequency band. FIG. 23 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 160 MHz frequency band. FIG. 24 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 160 MHz frequency band. Different interleaving can be applied to each stream of FIGS. 21, 22, 23, and 24.
    [0098] The transmission method according to an embodiment of the present invention as described above can be applicable when a data frame is transmitted by using a multi-channel. FIG. 25 shows an application modality of the data transmission method according to the present invention for a case in which data is transmitted over two non-contiguous multichannels in a frequency band of 80 MHz. FIG. 26 shows an application modality of the data transmission method according to the present invention for a case in which data is transmitted over three non-contiguous multi-channels in a frequency band of 80 MHz. Different interleaving can be applied to each flow of FIGS. 25 and 26.
    [0099] The transmission method according to an embodiment of the present invention as described above can be applicable when the VHT-SIG B field uses one QPSK symbol instead of two BPSK symbols. FIG. 27 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted by using a QPSK symbol in a 20 MHz frequency band. FIG. 28 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted by using a QPSK symbol in a 40 MHz frequency band. FIG. 29 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted by using a QPSK symbol in a frequency band of 80 MHz. FIG. 30 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted over two non-contiguous multichannels by using a QPSK symbol in a frequency band of 80 MHz. FIG. 31 shows an application embodiment of the data transmission method according to the present invention for a case in which data is transmitted over three non-contiguous multichannels by using a QPSK symbol in a frequency band of 80 MHz. different can be applied to each flow of FIGS. 27, 28, 29, 30, and 31.
    [00100] The transmission method according to an embodiment of the present invention as described above can be applicable when a stream is transmitted as a space-time block code (STBC) (or an Alamouti code) through two antennas. In this case, the VHT-SIG B field can be transmitted as the STBC in the same way as that of the data field, or the VHT-SIG B field can be transmitted by using one of the two spacetime streams. In the first case, information related to STBC must be included in VHT-SIG A in advance and transmitted, and in the latter case, information related to STBC can be included in VHT-SIG B and transmitted.
    [00101] FIG. 32 shows an application embodiment of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band of 20 MHz. FIG. 33 shows an embodiment of an application of a data transmission method according to the present invention to a case where a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a band of 40 MHz frequency.
    [00102] FIG. 34 shows an application embodiment of the data transmission method according to the present invention for a case in which one stream is transmitted by using two space-time streams in a 20 MHz frequency band. FIG. 35 shows an application modality of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band of 20 MHz. FIG. 36 shows an application embodiment of the data transmission method according to the present invention for a case in which a first stream is transmitted by using two space-time streams and a second stream is transmitted as it is in a frequency band of 40 MHz. In the embodiment of FIG. 36, streams can be effectively transmitted using a symbol.
    [00103] The data transmission method according to an embodiment of the present invention as described above can also be applicable when only a part of a stream is transmitted by using the STBC. The data transmission method according to an embodiment of the present invention as described above can also be applicable when the VHT-SIG B uses three or more OFDM symbols in transmitting a stream in a band of 20 MHz.
    [00104] A method of transmitting and receiving data according to another embodiment of the present invention will now be described.
    [00105] As described above, in an embodiment of the present invention, a dedicated signal field is iteratively effectively transmitted in a frequency or flow domain, to then obtain a maximum diversity gain. This method can be applicable for a case where a frame is transmitted by using channel bonding in a bandwidth of 40 MHz or 80 MHz.
    [00106] When two 20 MHz frequency bands are joined to form a 40 MHz frequency band, a part of a frequency tone, which is generally used as a guard band, or the like, can be used as a tone frequency for a data transmission. For example, in the case of 802.11n, the number of data transmission frequency tones in the 20 MHz band is 52, and the number of data transmission frequency tones in the 40 MHz band is 108. Mainly, in 802.11 n, the use of channel bonding results in an increase in the number of the four frequency tones of data transmission in the 40 MHz band. Thus, the number of transmission frequency tones can be further increased in an 80 MHz band by use of channel bonding based on the same principle.
    [00107] The above VHT-SIG B field transmission scheme of the present invention can be applicable to a frame transmission using channel bonding. In this document, increased data transmission frequency tones can be used to increase the amount of data included in a signal field or the iteration number of signal fields. Mainly, the method according to the present invention can be applicable even to a case in which the number of SIG B bits in the 40 MHz band or the 80 MHz band is greater than the number of SIG B bits in the band 20 MHz.
    [00108] FIG. 37 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a 40 MHz frequency band. FIG. 38 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a 40 MHz frequency band. FIG. 39 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a 40 MHz frequency band. FIG. 40 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band. Different interleaving can be applied to each stream of FIGS. 37, 38, 39, and 40.
    [00109] FIG. 41 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives a stream in a frequency band of 80 MHz. FIG. 42 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives two streams in a frequency band of 80 MHz. FIG. 43 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives three streams in a frequency band of 80 MHz. FIG. 44 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz. Different interleaving can be applied to each stream of FIGS. 41, 42, 43, and 44.
    [00110] When the number of bits of SIG B and the number of frequency tones used in transmission are not in a mutually multiple relationship, some frequency tones may remain after the SIG B iteration. In this case, an iteration method only a part of SIG B or filler can be used. This method can be applicable when the SIG B information is increased in accordance with an increase in frequency bandwidth from 20 MHz to 40 MHz and to 80 MHz.
    [00111] In general, when the frequency bandwidth is increased, the amount of data transmitted in the same duration is increased. In this way, when the length information of transmitted data, or the like, is included in the VHT-SIG B and transmitted, the length of the VHT-SIG B itself is increased. In this case, a bit allocation of the VHT-SIG B is modified by the frequency bandwidth and the VHT-SIG B can be iterated according to the number of transmittable frequency tones, thus increasing the transmission efficiency. For example, assume the number of data tones available in a 20 MHz band is 26 bits, the number of data tones available in a 40 MHz band is 54 bits, and the number of data tones available in an 80 MHz band is 117 bits. In this case, the length of the VHT-SIG B is 26 bits in the 20 MHz band, 27 bits in the 40 MHz band, and 29 bits in the 80 MHz band. FIG. 45 shows a bit allocation in this case.
    [00112] FIG. 46 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band, when the bit numbers of the VHT-SIG B are allocated as shown in FIG. 45. FIG. 47 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band, when the bit numbers of the VHT-SIG B are allocated as shown in FIG. 45. FIG. 48 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz, when the bit numbers of the VHT-SIG B are allocated as shown in FIG. 45. Different interleaving can be applied to each stream of FIGS. 46, 47, and 48. The present invention may be applicable even when the number of streams transmitted is modified in the embodiments of FIGS. 46, 47, and 48.
    [00113] The bit allocation of the VHT-SIG B in FIG. 45 includes tail bits for a convolutional code. However, the VHT-SIG B of FIG. 45 does not include CRC bits to determine whether or not a codeword has an error, making it difficult to reliably obtain the data. However, in the case of the 20 MHz band, since there is no extra bit in VHT-SIG B, some (4 to 8 bits) of the reserved bits included in a service field of a data field can be used as the bit CRC as shown in FIG. 49.
    [00114] When bit allocation as shown in FIG. 49 is used, the CRC is simultaneously applied to SIG B and a frequency mixer seed. Thus, the calculation of CRC with respect to a variable length is necessary for each frequency band. The VHT-SIG B field uses a lower modulation scheme and coding rate (BPSK 1/2), and is available for an iterative coding for frequency and an antenna domain, so it has high reliability. Meanwhile, the service field uses the modulation scheme and coding rate used for data transmission, as is, so its reliability is relatively variable and generally has low reliability compared to VHT-SIG B. In this case, the use of CRC can detect an error of the information included in the VHT-SIG B field and an error of a frequency scrambler. Thus, when a frequency blender seed error is detected, the operation of PHY and MAC layers can be stopped, obtaining an effect of reducing power consumption.
    [00115] The above method may be applicable to SU-MIMO. In SU-MIMO, the VHT-SIG A can relatively have extra bits. Then, in SU-MIMO, the MCS bits, which are included in the VHT-SIG B field, can be included in the VHT-SIG A field. In SU-MIMO, the number of antennas in use can be increased, thus the number field bits indicating a data length can be increased. FIG. 50 shows a bit allocation of VHT-SIG B when VHT-SIG B has a length of 26 bits in a 20 MHz band, 27 bits in a 40 MHz band, and 29 bits in an 80 MHz band in SU -PASTE.
    [00116] FIG. 51 shows an embodiment of an application of a data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band, when the numbers of bits of the VHT- SIG B are allocated as shown in FIG. 50. FIG. 52 shows an embodiment of an application of a data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band, when the bit numbers of the VHT- SIG B are allocated as shown in FIG. 50. FIG. 53 shows an embodiment of an application of a data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz, when the numbers of bits of the VHT- SIG B are allocated as shown in FIG. 50. Different interleaving can be applied to each stream of FIGS. 51, 52, and 53. The present invention may be applicable even when the number of transmitted streams is modified in the embodiments of FIGS. 51, 52 and 53.
    [00117] When bit allocation of the VHT-SIG B field as shown in FIG. 50 is used, the VHT-SIG B field includes tail bits for a convolutional code. However, the VHT-SIG B of FIG. 50 does not include CRC bits to determine whether or not a codeword has an error, making it difficult to reliably obtain the data. However, in the case of the 20 MHz band, since there is no extra bit in VHT-SIG B, some (4 to 8 bits) of the reserved bits included in a service field of a data field can be used as the bit of CRC as shown in FIG. 54.
    [00118] When bit allocation as shown in FIG. 54 is used, the CRC is simultaneously applied to the SIG B and the frequency mixer seed. Thus, the calculation of CRC with respect to a variable length is necessary for each frequency band. The VHT-SIG B field uses a lower modulation scheme and coding rate (BPSK 1/2), and is available for an iterative coding for frequency and an antenna domain, so it has high reliability. Meanwhile, the service field uses the modulation scheme and coding rate used for data transmission, as is, so the reliability is relatively variable and generally has low reliability compared to VHT-SIG B. In this case , the use of CRC can detect an error of the information included in the VHT-SIG B field and an error of a frequency scrambler. Thus, when a frequency blender seed error is detected, the operation of PHY and MAC layers can be stopped, obtaining an effect of reducing power consumption.
    [00119] In the data transmission and reception method according to the present invention, as described above, when the VHT-SIG B field is transmitted, different interleaving is applied to the frequency domain with respect to mutually different transmission streams, thus obtaining a maximum diversity gain even in the antenna domain. In this regard, however, in order to obtain similar effects while slightly reducing complexity, Cyclic Delay Diversity (CDD) technique can be used to transmit the VHT-SIG B field, without applying different interleaving to each stream. streaming. In this case, the same data is transmitted by each transmit antenna, and in this document, a different delay is applied to each antenna.
    [00120] FIG. 55 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 20 MHz frequency band, when the cyclic delay diversity (CDD) technique ) is used and different delay is applied to each antenna. FIG. 56 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a 40 MHz frequency band, when a CDD technique is used and different delay is applied to each antenna. FIG. 57 shows an application modality of the data transmission method according to the present invention to a case in which a station (STA) receives four streams in a frequency band of 80 MHz, when a CDD technique is used and different delay is applied to each antenna. Different delay is applied to each flow of FIGS. 55, 56, and 57. The present invention may be applicable even when the number of streams transmitted is modified in the embodiments of FIGS. 55, 56 and 57.
    [00121] Also, matrix scattering for the antenna domain having a size of (number of transmit antennas and number of transmit antennas) can be additionally applicable to the VHT-SIG B transmission scheme of the present invention. When different interleaving is applied to each stream, matrix scattering when multistream is applied can be applicable, and when each stream is transmitted by applying delay to it, matrix scattering when a single stream is applied can be applicable.
    [00122] FIG. 58 shows the configuration of a transmission terminal in accordance with an embodiment of the present invention.
    [00123] A transmission terminal 5802 includes a signal field generating unit 5804, a data field generating unit 5806, a data frame generating unit 5808 and a transmission unit 5810. signal field 5804 iteratively generates a signal field in accordance with a frequency band applied to the transmission of a data frame. The data field generating unit 5806 generates a data field including data to be transmitted to a receiving terminal. The data frame generating unit 5808 generates a data frame which includes the signal field generated by the signal field generating unit 5804 and the data field generated by the data field generating unit 5806. The transmission unit 5810 transmits the data frame generated by the data frame generating unit 5808 to the receiving terminal.
    [00124] In this document, the signal field may include a length field, which indicates the length of a data field, and the length field may have a length that differs according to a frequency band applied to the transmission of a data frame. Also, the signal field may include an encoding modulation field (MCS) scheme indicating a modulation method and a data field encoding method. Also, the signal field can be a dedicated signal field to transfer information regarding each user. The data frame may include a cyclic redundancy check (CRC) field to detect a signal field error.
    [00125] FIG. 59 shows the configuration of a receiving terminal in accordance with an embodiment of the present invention.
    [00126] A receiving terminal 5902 includes a receiving unit 5904 and a data acquisition unit 5906. The receiving unit 5904 receives a data frame including a signal field and a data field.
    [00127] In this document, the signal field may include a length field, which indicates the length of a data field, and the length field may have a length that differs according to a frequency band applied to the transmission of a data frame. Also, the signal field may include an encoding modulation field (MCS) scheme indicating a modulation method and a data field encoding method. Also, the signal field can be a dedicated signal field to transfer information regarding each user. The data frame may include a cyclic redundancy check (CRC) field to detect a signal field error.
    [00128] The data acquisition unit 5906 obtains data included in the data field by using the signal field included in the received data frame. In this document, the data acquisition unit 5906 can obtain the data by using the length field, the MCS field, or the like, included in the signal field. Also, the data acquisition unit 5906 can detect a signal field error by using the CRC field included in the data frame.
    [00129] FIG. 60 is a flowchart illustrating the process of a method for transmitting data via a transmission terminal in accordance with an embodiment of the present invention.
    [00130] First, a signal field is iteratively generated according to a frequency band applied to the transmission of a data frame (6002). Also, a data field including data to be transmitted to a receiving terminal is generated (6004). And then, a data frame including the generated signal field and data field is generated (6006). Since then, the generated data frame is transmitted to a receiving terminal (6008).
    [00131] In this document, the signal field may include a length field, which indicates the length of the data field, and the length field may have a length that differs according to a frequency band applied to the transmission of the frame. Dice. Also the signal field may include a modulation coding field (MCS) scheme indicating a modulation method and a data field coding method. Also, the signal field can be a dedicated signal field to transfer information regarding each user. The data frame may include a cyclic redundancy check (CRC) field to detect a signal field error.
    [00132] FIG. 61 is a flowchart illustrating the process of a method for receiving data by a receiving terminal in accordance with an embodiment of the present invention.
    [00133] First, a data frame including a signal field and a data field is received (6102). In this document, the signal field can include a length field that indicates the length of the data field, and the length field can have a length that differs according to a frequency band applied to the transmission of the data frame. Also, the signal field may include an encoding modulation field (MCS) scheme indicating a modulation method and a data field encoding method. Also, the signal field can be a dedicated signal field to transfer information regarding each user. The data frame may include a cyclic redundancy check (CRC) field to detect a signal field error.
    [00134] And then, the data included in the data field is obtained by using the signal field included in the received data frame (6104). In this case, the receiving terminal can obtain data by using the length field, the MCS field, or the like, included in the signal field. Also, the receiving terminal can detect a signal field error by using a CRC field included in the data frame.
    [00135] According to the embodiments of the present invention, when a dedicated signal field is transmitted in the MUMIMO system, the performance of the signal field is enhanced and a transmission time is reduced by using the user frequency band and the number of streams through which a large amount of information can be effectively transmitted using the signal field.
    [00136] Although the present invention has been described with reference to exemplary embodiments and accompanying drawings, it may be appreciated by those skilled in the art that the present invention is not limited thereto, but various modifications and alterations should be made without from the scope defined in the Claims and their equivalents.
    权利要求:
    Claims (12)
    [0001]
    1. Method for Transmitting and Receiving Data in Wireless Local Area Network, characterized in that it comprises receiving, by a receiver, a frame that includes a Very High Processing Signal field A (VHT-SIG-A) and a Signal field Very High Processing B (VHT-SIG-B) in an operating band, the operating band comprising a plurality of 20 MHz bands; and wherein: the VHT-SIG-A field is transmitted on each of the plurality of 20 MHz bands; the VHT-SIG-B field is transmitted in an orthogonal frequency division multiplexing (OFDM) symbol and the VHT-SIG-B field corresponds to a plurality of bits; a number of bits corresponding to the VHT-SIG-B field is differently defined based on the operating band; the plurality of bits corresponding to the VHT-SIG-B field comprises a first bit part, wherein the first bit part is repeated; the first bit part comprises a length indicator; and a first number of bits representing the length indicator when the operating band is 40 MHz is less than a second number of bits representing the length indicator when the operating band is equal to or greater than 80 MHz.
    [0002]
    Method for Transmitting and Receiving Wireless LAN Data, according to Claim 1, characterized in that the VHT-SIG-A field occupies two orthogonal frequency division multiplexing (OFDM) symbols.
    [0003]
    Method for Transmitting and Receiving Wireless LAN Data, according to Claim 2, characterized in that the first bit part consists of 27 bits and the first number of bits representing the length indicator is 17, if the bandwidth of the operating bandwidth is 40 MHz.
    [0004]
    4. Method for Transmitting and Receiving Wireless LAN Data, according to Claim 1, characterized in that the first bit part consists of 29 bits and the second number of bits representing the length indicator is 19, if the bandwidth of the operating bandwidth is greater than 40 MHz.
    [0005]
    Method for Transmitting and Receiving Wireless LAN Data, according to Claim 4, further comprising: receiving a data field, the data field including a cyclic redundancy check (CRC) field used for detect a VHT-SIG-B field error.
    [0006]
    Equipment for Transmitting and Receiving Data over a Wireless Local Area Network, using the method as defined in Claim 1, characterized in that it comprises: a processor; and a memory operationally coupled to the processor and storage instructions which, when executed by the processor, cause the wireless communication apparatus to: receive a frame including a Very High Processing Signal A (VHT-SIG-A) field and a Very High B Signal Processing (VHT-SIG-B) field in an operating band, the operating band comprising a plurality of 20 MHz bands; wherein: the VHT-SIG-A field is transmitted in each of the plurality of 20 MHz bands; the VHT-SIG-B field is transmitted in an orthogonal frequency division multiplexing (OFDM) symbol and the VHT-SIG-B field corresponds to a plurality of bits; a number of bits corresponding to the VHT-SIG-B field is differently defined based on the operating band; the plurality of bits corresponding to the VHT-SIG-B field comprises a first bit part, wherein the first bit part is repeated; the first bit part comprises a length indicator; and a first number of bits representing the length indicator when the operating band is 40 MHz is less than a second number of bits representing the length indicator when the operating band is equal to or greater than 80 MHz.
    [0007]
    Equipment for Transmitting and Receiving Data in Wireless Local Area Network, according to Claim 6, characterized in that the VHT-SIG-A field occupies two orthogonal frequency division multiplexing (OFDM) symbols.
    [0008]
    Equipment for Transmitting and Receiving Data over a Wireless Local Area Network, according to Claim 6, characterized in that the VHT-SIG-A field includes the first information common to a plurality of receivers and the VHT-SIG-B field includes the second information specific to the receiver.
    [0009]
    9. Equipment for Transmitting and Receiving Wireless LAN Data, according to Claim 6, characterized in that the first bit part consists of 27 bits and the first number of bits representing the length indicator is 17, if the bandwidth of the operating bandwidth is 40 MHz.
    [0010]
    10. Equipment for Transmitting and Receiving Wireless LAN Data, according to Claim 6, characterized in that the first bit part consists of 29 bits and the second number of bits representing the length indicator is 19, if the the operating bandwidth is greater than 40 MHz and the operating bandwidth is equal to or less than 80 MHz.
    [0011]
    Equipment for Transmitting and Receiving Data over a Wireless Local Area Network, according to Claim 6, characterized in that the VHT-SIG-A field includes the first information common to a plurality of receivers and the VHT-SIG-B field includes the second information specific to the receiver.
    [0012]
    12. Equipment for Transmitting and Receiving Wireless LAN Data, according to Claim 6, characterized in that the first bit part includes an index in relation to the modulation and coding scheme (MCS), the length indicator and the tail bits and where the index for the MCS is 4 bits long, the tail bits are 6 bits long, and the length indicator is less than 20 bits.
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    法律状态:
    2019-12-31| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-03-24| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04B 7/04 Ipc: H04B 7/0452 (2017.01), H04L 1/08 (2006.01), H04B 7 |
    2020-03-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-08-03| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-09-14| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 11/03/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
    优先权:
    申请号 | 申请日 | 专利标题
    KR20100022122|2010-03-12|
    KR10-2010­0022122|2010-03-12|
    KR10-2010-0065898|2010-07-08|
    KR20100065898|2010-07-08|
    KR10-2010-0066458|2010-07-09|
    KR20100066458|2010-07-09|
    KR10-2010-0068167|2010-07-14|
    KR20100068167|2010-07-14|
    KR10-2010-0072506|2010-07-27|
    KR20100072506|2010-07-27|
    PCT/KR2011/001742|WO2011112054A2|2010-03-12|2011-03-11|Method and apparatus for transmitting and receiving data in a mimo system|
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