巴西专利BR112012022751B1 APPARATUS AND METHOD OF WIRELESS COMMUNICATION

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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 equipment for data transception. a method in which a transmitting terminal transmits data to a receiving terminal in a minimal system according to an embodiment of the present invention comprises the following steps: generating a data field containing the data; generate a signal field containing information about the data field; generating a data frame that contains the data field and the signals field; and transmitting the data frame to the receiving end. In accordance with the present invention, an end of the frame being transmitted is precisely notified to the receiving end in a communications system where the frame is transmitted using mimo, thereby decoding the frame more efficiently at the receiving end. .
公开号:BR112012022751B1
申请号:R112012022751-3
申请日:2011-03-11
公开日:2021-09-14
发明作者:Il-Gu Lee；Jae-Seung Lee；Yun-Joo Kim；Jong-Ee Oh；Sok-Kyu Lee；Minho Cheong；Jaewoo Park；Jeeyon Choi
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 transferring and receiving data, and more particularly, a method and apparatus for transferring and receiving data in a multiple input multiple output (MIMO) system. Foundation of Technique
[002] A wireless local area network (WLAN) basically supports a Basic Service Set (BSS) mode including an access point (AP) serving as a connection point of a distribution system (DS) and a plurality of stations (STAs), not APs, or an independent BSS mode (IBSS) including only stations (STAs) (hereinafter, AP and STA will be referred to as a 'terminal').
[003] In a communication system such as a WLAN, or similar, a frame (or a data frame) and length information with respect to the frame length are exchanged between a media access control (MAC) layer and a physical layer (PHY). In order to inform a receiver (or a receiving end) about the frame end, a PHY layer of a transmitter (or a sending end) includes a header having information regarding the frame length in the frame and transmits the same or add a delimiter including information that indicates the edge of the frame at the edge of the frame. In this way, at the PHY layer the receiver recognizes the end of the received frame by using the length information or the delimiter information having a particular format included in the received frame.
[004] An international standard of WLAN by IEEE 802.11 defines a data unit processed in a MAC layer, as a MAC protocol data unit (MPDU). When the MPDU is transferred from a MAC layer to a PHY layer, it is called a PHY service data unit (PSDU). The frame length information for frame edge recognition is transferred, along with the PSDU, from a MAC layer to a PHY layer. The PHY layer of the transmitter transmits the frame length information along with the data to the receiver. A receiver PHY layer decoder restores the MPDU included in the PSDU for the length indicated in the length information by using the length information included in a signal symbol of a Physical Layer Convergence Protocol (PLCP) preamble of the received frame and transfers the restored data and length information for the MAC layer.
[005] For communication based on the IEEE 802.11 standard, various methods are used for the transmitter to transfer length information to the receiver. For example, in 802.11b, a PLCP header includes time information having a size of 16 bits, and in 802.11a/g, an L-SIG field of a PLCP preamble includes length information having a size of 12 bits representing the length of one frame per byte. Also, in 802.11n, an HT-SIG field of the PLCP preamble includes length information having a size of 16 bits representing the length of one MAC layer MPDU or A-MPDU (Aggregate MPDU) per byte. Revelation Technical problem
[006] The present invention provides a method and apparatus for accurately informing a receiver of an end of a transmitted frame to thereby allow the receiver to effectively restore the frame, in a communication system in which a frame is transmitted using multiple input multiple output (MIMO).
[007] The above and other objectives, features, aspects and advantages of the present invention will be understood and will become more evident 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.
[008] Technical Solution
[009] In one aspect, a method for transmitting data from a transmit terminal to a receiving terminal in a multiple input multiple output (MIMO) system includes generating a data field including the data, generating a signal field including the information regarding the data field, generating a data frame including the data field and the signal field, and transmitting the data frame to the receiving terminal.
[0010] In another aspect, a method for receiving data, by a receiving terminal, transmitted from a transmitting terminal in a multiple input multiple output (MIMO) system includes receiving a data frame including a data field including the data and a signal field including information regarding the data field, decoding the data frame and producing the signal field and the data field, and obtaining the data from the data field by using the signal field.
[0011] In another aspect, a transmit terminal for transmitting data to a receiving terminal in a multiple input multiple output (MIMO) system includes a data field generating unit generating a data field including the data, a unit a signal field generating unit generating a signal field including information regarding the data field, a data frame generating unit generating a data frame including the data field and the signal field, and a unit transmission, which transmits the data frame to the receiving terminal.
[0012] In another aspect, a receiving terminal for receiving data transmitted from a transmitting terminal in a multiple input multiple output (MIMO) system includes a receiving unit receiving a data frame including a data field including the data and a signal field including information regarding the data field, a decoding unit decoding the data frame and producing the signal field and the data field, and a data acquisition unit obtaining the data from the data field by using the signal field. Advantageous Effects
[0013] According to the embodiments of the present invention, in a communication system in which a frame is transmitted using MIMO, the end of a transmitted frame is precisely informed to a receiver, so that the receiver can effectively restore the painting. Description of Drawings
[0014] FIG. 1 shows a method for reporting the edge of a frame by using a frame fill and transmit duration.
[0015] FIG. 2 shows an embodiment in which information about the edge of a frame is provided to a receiver by using transmission duration information and frame length information according to an embodiment of the present invention.
[0016] FIG. 3 shows another embodiment in which information about the edge of a frame is provided to a receiver by using transmission duration information and frame length information according to an embodiment of the present invention.
[0017] FIG. 4 shows an MU-MIMO PPDU format to which a data transmission and reception method according to an embodiment of the present invention is applied.
[0018] FIG. 5 shows the configuration of a VHT data field in accordance with an embodiment of the present invention.
[0019] FIG. 6 shows a format of a PHY service data unit (PSDU) included in the VHT data field in FIG. 5.
[0020] FIG. 7 shows an embodiment in which the PSDU length information is designated in the VHT SIG-B according to the present invention.
[0021] FIG. 8 shows an embodiment in which length information is designated using a service field in accordance with the present invention.
[0022] FIG. 9 shows an embodiment in which length information is designated by using both a VHT-SIG B field and a service field according to the present invention.
[0023] FIG. 10 shows an embodiment in which a length field of a PSDU is protected by using a parity bit in accordance with the present invention.
[0024] FIG. 11 shows an embodiment in which a symbol length of each user is transferred to the receiver in accordance with the present invention.
[0025] FIG. 12 shows a method for protecting the VHT-SIG B field in the embodiment of FIG. 11.
[0026] FIG. 13 shows an embodiment in which PSDU length information is transmitted in Qword units (4 bytes) in accordance with the present invention.
[0027] FIG. 14 shows an embodiment in which only the PSDU length information is included in the VHT-SIG B field according to the present invention.
[0028] FIG. 15 shows an embodiment in which length information is represented by combining a MAC stuffing scheme and a length indication scheme according to the present invention.
[0029] FIG. 16 shows embodiments in which an additional termination attenuator of FIG. 15 is substituted in accordance with the present invention.
[0030] FIG. 17 is a block diagram to explain an insertion of a PHY attenuator performed in a PHY layer.
[0031] FIG. 18 shows a modulation scheme of the VHT-SIG B and a data representation scheme according to bandwidth.
[0032] FIG. 19 illustrates a PPDU format in accordance with an embodiment of the present invention.
[0033] FIG. 20 illustrates a PPDU format in accordance with another embodiment of the present invention.
[0034] FIG. 21 shows the configuration of a transmission terminal in accordance with an embodiment of the present invention.
[0035] FIG. 22 shows the configuration of a receiving terminal in accordance with an embodiment of the present invention.
[0036] FIG. 23 is a flowchart illustrating a process of a data transmission method according to an embodiment of the present invention.
[0037] FIG. 24 is a flowchart illustrating a process of a data transmission method in accordance with an embodiment of the present invention. Mode for the Invention
[0038] The above and other objectives, characteristics, advantages and aspects of the present invention will be described in detail in conjunction with the accompanying drawings and, therefore, a person versed in the art to which the present invention belongs will be easily 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.
[0039] For communication based on the IEEE 802.11 standard, various methods are used for a transmitter (or a sending end) to transfer the length information to a receiver (or a receiving end). For example, in 802.11b, a PLCP header includes time information having a size of 16 bits and in 802.11a/g, an L-SIG field of a PLCP preamble includes length information having a size of 12 bits representing the length of one frame by byte. Also, in 802.11n, an HT-SIG field of the PLCP preamble includes length information having a size of 16 bits representing the length of one MAC layer MPDU or A-MPDU (Aggregate MPDU) per byte.
[0040] Meanwhile, in 802.11ac, multiple input multiple output (MIMO) wireless transmission using multiple antennas is used. In 802.11ac, MIMO is divided into a single-user MIMO (SU-MIMO), a 1:1 transmission, and a multiple-user MIMO (MU-MIMO) in which multiple frames are simultaneously transmitted to multiple users by using the multiple spatial division access (SDMA). In 802.11ac, when SUMIMO is used, length information can be included in a GIS field for 802.11ac to inform a receiver of the length of a frame. However, when MU-MIMO is used, since the length of each of the frames transferred for multiple users can be different, a different method to inform each user about one end of a pertinent frame is needed.
[0041] When a MU-MIMO downlink transmission section ends, upon receipt of those that require a response, among the receiving terminals (for example, STAs), it can sequentially transmit an ACK protocol to a transmission terminal (for example, AP). Here, various methods can be used to inform each of the receiving terminals about the request and a transmission reference time for transmitting an ACK protocol. For example, ACK protocol transmission request information can be provided to each of the receiving terminals by using a previously transmitted frame. Also, in order to inform each of the receiving terminals of a transmission reference time, transmission duration information indicating a point in time at which an MU-MIMO downlink transmission section ends may be included in a SIG field for 802.11 ac, whereby information about the length of a PPDU transmitted over the longest period of time can be provided to each of the receiving terminals. In the case of using such a GIS field, even when a certain receiving terminal is allocated to a spatial stream having a short length, a current channel carries out transmission during the longer spatial stream, so that the channel is in an occupied state . When a frame reception from a receiving terminal receiving the longest PPDU is terminated, the channel becomes inactive, and therefore, each receiving terminal transmits an ACK protocol to the transmitting terminal in accordance with a certain procedure.
[0042] One of the methods to indicate the end of a frame by using a delimiter is to recognize a maximum number of symbols of the MU-MIMO transmission through the transmission duration information and fill up to the last symbol of a frame with padding delimiter , MAC filler, and PHY filler. A PHY service data unit (PSDU) transferred from a MAC layer to a PHY layer includes useful data and padding information and the pad pad and MAC pad delimiter are classified as non-useful data.
[0043] FIG. 1 shows a method for indicating the end of a frame by using frame fill and transmission duration. When a transmitter transmits a frame by using frame fill as shown in FIG. 1, a PHY layer of a receiver cannot know the useful data length. Thus, a receiver PHY layer decoder restores the padding delimiter, padding MAC, and the last bit of PHY attenuator excluding a termination of the last symbol, as well as the useful data of the received frame. Here, when the PHY attenuator bit has a size of 7 bits or smaller, which fails to constitute 1 octet, it is discarded, and then other restored data is transferred to a MAC layer. As a result, the PHY layer of the receiver cannot transfer the useful data length to the MAC layer via VECTOR RX.
[0044] Here, the MAC layer receives a filled MAC frame. Thus, the MAC layer cannot recognize the edge of the received frame until it parses the last frame delimiter, thus, it can precisely restore the MAC frame after recognizing the edge of the frame. In this method, the frame length is extended by using a null delimiter applied to the 802.11n A-MPDU, so in the MAC frame, only the A-MPDU, rather than the MPDU, must necessarily be used.
[0045] In this way, in the communication method using MIMO, in particular, MU-MIMO, in order to allow the receiver to effectively restore the frame, the information about the transmitted frame end needs to be precisely provided to the receiver. The present invention relates to a method and apparatus for accurately informing a receiver of an end of a transmitted frame, thereby allowing the receiver to effectively restore the frame.
[0046] The present invention will now be described in detail through the modalities.
[0047] In MU-MIMO, frames, each having a different length, are simultaneously transmitted to several users, and each frame is transmitted to a receiving terminal of each user through beamforming. Here, in order to inform each receiving end about the edge of a frame, the following two methods can be used.
[0048] The first method is including, by a PHY layer of a transmitter, a length field in a GIS field or a service field, of each user. The second method is filling, by a MAC layer, a remaining frame with the filling information such that it has the same number of OFFDM symbols as that of the longest frame within the transmitted frames, and transferring the same to a PHY layer. Then, the PHY layer includes information about the number of OFFDM symbols of each frame in a SIG field, and a MAC layer of a receiver can recognize the end of a received frame by analyzing the frame.
[0049] In the MU-MINO transmission section, in order to inform the receiver about the transmit end and the MU-MIMO spatial stream end, the transmission duration and frame length information are used. When a signal field is broadcast to multiple users, the information normally needed by the users is included in a common signal field and information about each user is included in a dedicated signal field and broadcast. The transmission duration information is the common information all the terminal participating in the MU-MIMO transmission must know for a clear channel evaluation delay (CCA), thus this is included in the common signal field. Meanwhile, since the lengths of the respective frames are different, the length information frame can be included in the per-user information (or per-user info) of the dedicated signal field, eg a VHT-SIG field.
[0050] Here, the length information can be: 1) information about the length of the PSDU, 2) information about the length of the A-MPDU or MPDU among the elements that make up the PSDU, or 3) information about the length of the A-MPDU or MPDU, the current data information among MAC padding information. The types of such length information represent an embodiment of the present invention, and various types of information can be expressed according to length expression methods.
[0051] FIG. 2 shows an embodiment in which information about the edge of a frame is provided to a receiver by using the transmission duration information and the frame length information according to an embodiment of the present invention. In the present embodiment, when the transmitter transmits a frame, it includes the transmission duration information and frame length information in the VHT-SIG field and transmits the same. The receiver PHY layer recognizes a transmission termination time (or a transmitter time) through the transmission duration information and transfers it to the MAC layer. Here, the PHY layer informs the MAC layer about a reference time through a VECTOR RX or a CCA idle event and the MAC layer calculates a time at which an ACK protocol should be transmitted to the transmitting terminal by using the information of time reference.
[0052] Also, the PHY layer of the receiver restores the length information and the decoder restores the data by using the restored length information. Here, the MAC layer knows the precise frame length via VECTOR RX, so there is no need to perform additional delimiter matching in a MAC protocol.
[0053] In the embodiment of FIG. 2, the receiver can know the current frame length information by using the length information, the PHY layer can perform decoding only by the designated length and finish it. Thus, the energy and time required for decoding can be reduced. Also, MAC layer does not perform delimiter analysis, the same effect can be obtained.
[0054] FIG. 3 shows another embodiment in which information about the edge of a frame is provided to a receiver by using transmission duration information and frame length information according to an embodiment of the present invention. When the transmission of a short stream is first terminated in the MU-MINO transmission section, the transmit power of the transmitter is reduced. In this way, the receiving power is also reduced when a corresponding signal is restored at the receiver, in which case a problem can arise with a detection of a signal that has not been completely received yet (especially that it is larger than other signals) on the receiver.
[0055] Thus, in order to solve the problem, the transmitter fills a spatial stream of each of the other remaining frames, based on a frame having the longest transmission duration, with PHY padding. As a result, frames having the same transmission duration are generated as shown in FIG. 3, thus, the transmitter can transmit the frames in the transmission duration period by using uniform energy. The receiver can stably detect data from a spatial stream having the longest frame, and the receiving terminal that receives a short spatial stream does not perform unnecessary decoding via the length information. Here, the PHY padding inserted in the transmit does not affect the detection of the frame end at the receiver.
[0056] FIG. 4 shows an MU-MIMO PPDU format to which a data transmission and reception method according to an embodiment of the present invention is applied. In FIG. 4, an L-STF field, an L-LTF field, and an L-SIG field are the same as those of 802.11a/g. Meanwhile, a VHT-SIG A field includes the information commonly applied to each user frame, and a VHT-SIG B field provides the necessary information for each user.
[0057] In FIG. 4, the VHT-SIG field includes the VHT-SIG A field and the VHT-SIG B field in both the SU-MIMO and MU-MIMO systems. The VHT-SIG A and VHT-SIG B fields are modulated according to BPSK and have a long guard interval.
[0058] The VHT-SIG A field has the common information applied to every terminal that receives the PPDU. Meanwhile, in the MU-MIMO system, the VHT-SIG B field includes the information applied to individual users, respectively, and is transmitted to each user through spatial multiplexing. Multiple users for simultaneous streaming can be limited to four users.
[0059] Table 1 below shows the configuration of the VHT-SIG Busada field in the SU-MIMO and MU-MIMO systems.

[0060] The VHT-SIG B is modulated according to the BPSK. In an embodiment of the present invention, the transmitting terminal can variably use a frequency band in data transmission. The number of bits allocated to VHT-SIG B varies according to the frequency band applied to data transmission. For example, in a 20 MHz mode, 26 bits are allocated to the VHT-SIG B, and in a mode greater than 20 MHz, a frequency tone is added according to channel bonding, thus additional bits in addition 26 bits are allocated. For example, in a 40 MHz mode, 54 bits, the same as those of 802.11n, can be used, and when it is converted to 20 MHz, 27 bits can be used. In an 80 MHz mode, 117 bits can be used, and when it is converted to 20 MHz, 29 bits can be used.
[0061] In this way, as the frequency bandwidth used for data transmission increases, the amount of data transmitted is also increased, and thus, the length of a field representing the length of a frame must be increased . In order to support the maximum packet duration (5.46 ms) that can be set in the L-SIG field by a frequency band, bits to set DWORD are additionally needed according to the increase in bandwidth. Table 1 shows the configuration of the VHT-SIG B field reflecting additionally allocated bits across the channel link according to each bandwidth.
[0062] In the PPDU format of FIG. 4, VHT-DATA is data processed according to a modulation and coding scheme (MCS) of each user, which includes a service field, a PSDU field, a termination field and an attenuator PHY field.
[0063] FIG. 5 shows the configuration of the VHT data field in accordance with an embodiment of the present invention. The termination field can be positioned immediately behind the PSDU field or it can be positioned at the end of the entire VHT data field according to the method for designating the length. In the latter case, the position of the termination field can be accurately recognized using the number of symbols and an Ndbps value.
[0064] FIG. 6 shows a format of the PSDU included in the VHT data field in FIG. 5. In FIG. 6, a Qword Padding field, A-MPDU null delimiter, a final MAC padding field can be selectively added after the A-MPDU. The Qword padding field is the size of a multiple of 4 bytes. The A-MPDU null delimiter is added by the designated size in 4-byte units on a 4-byte boundary. The final MAC pad fills a remaining area, failing to reach 4 bytes, with bytes of a designated size.
[0065] Hereinafter, various methods of representing the length information designating the length of a frame included in the PSDU will be described.
[0066] FIG. 7 shows an embodiment in which the PSDU length information is designated in the VHT SIG-B according to the present invention. In FIG. 7, the length of a frame of each user can be indicated by the VHT-SIG B field, the termination field can be present immediately after the PSDU. The VHT-SIG B field is modulated by BPSK 1/2, having high reliability, and thus an error probability of the length information is reduced.
[0067] FIG. 8 shows an embodiment in which length information is designated using a service field in accordance with the present invention. In FIG. 8, the length information (PSDU length) is included in the service field of the VHT data field. Here, the service field extends from 16 bits to 32 bits.
[0068] As shown in FIG. 8, the service field can be configured according to the following two methods.
[0069] 1) Service field = Scrambler Source (7 bits) + Reserved (9 bits) + User Length (16 bits)
[0070] 2) Service field = Scrambler Origin (7 bits) + User Length (16 bits) + CRC (8 bits)
[0071] The length information appears after a decoding operation in the service field, so it is positioned at the end of the data field. When the field of service includes a cyclic redundancy check (CRC), if a CRC error occurs, data processing in a PHY layer is stopped, obtaining the energy-saving effect in the PHY and MAC layers.
[0072] FIG. 9 shows an embodiment in which length information is designated by using both the VHT-SIG B field and the service field according to the present invention. The VHT-SIG B field is limited in size, so it cannot include a CRC field for error detection. When BPSK 1/2 modulation is employed, the VHT-SIG B field has a size of 24 bits or 26 bits. When PSDU length information is included in VHT-SIG B as shown in FIG. 9, the CRC field can be included in the service field to reduce the overhead of the VHT-SIG B. The CRC field having the size of 8 bits is applied to each field of the VHT-SIG B field, a source field of the scrambler of the service field and reserved bits. By protecting the respective fields by the use of a CRC field, an error detection probability can be enhanced and unnecessary data processing of a PHY layer can be prevented.
[0073] In the previous mode, the CRC field included in the service field can be applied as in the two following modes.
[0074] 1) CRC is applied to the length of MCS, FEC, PSDU and scrambler source fields
[0075] 2) CRC is applied to the lengths of the MCS, FEC, PSDU fields, excluding the service field
[0076] FIG. 10 shows an embodiment in which the PSDU length field is protected by using a parity bit in accordance with the present invention. As shown in FIG. 10, a parity bit (1 bit) can be added behind the PSDU length field to reduce an error in PSDU length field restoration and detection.
[0077] FIG. 11 shows an embodiment in which a symbol length of each user is transferred to the receiver in accordance with the present invention. Different from the previous modality, in the modality of FIG. 11, information regarding the length of the last symbol including a portion of the PSDU, rather than information regarding the length of the PSDU, is transferred. In this mode, the position of the termination field can vary according to the number of symbols occupied by a user frame. For a PHY attenuator field belonging to the last symbol occupied by the PSDU to have a size of 0 to 7 bits, a MAC padding field is padded in byte units (See FIG. 6). When length information is transmitted in symbol units as in the present embodiment, the reserved bits existing in the VHT-SIG B field can be used for a different purpose. Meanwhile, when the MAC padding field is included as shown in FIG. 11, the information included in the MAC padding field must be analyzed after the PSDU is transferred to the MAC layer of the receiver, potentially generating overhead.
[0078] FIG. 12 shows a method for protecting the VHT-SIG B field in the embodiment of FIG. 11. As shown in FIG. 12, the transmitter includes the CRC field in the service field. Here, the CRC field is calculated based on the VHT-SIG B (excluding the termination field) and inserted into the 8 bits of MSB of the service field. Mainly, the scrambler's source field is not considered when calculating the CRC field. The service field and PSDU can be scrambled in the same way as that of 802.11n.
[0079] The reliably calculated CRC field has an effect of protecting an initial state of a scrambler, as well as protecting the VHT-SIG B field. If the CRC field is calculated in consideration of the uniform scrambler's source field, if there is an error in the initial state of the scrambler, the CRC field has an error after unscramble. So a CRC with respect to the VHT-SIG B field also fails. Thus, the CRC field calculated as described above has the effect of detecting even a scrambler error.
[0080] For reference, the number of octets calculated according to the length field of the VHT-SIG B field cannot be greater, by 3 octets or more, than the number of octets calculated by the length of L-SIG Length and the MCS field of the VHT-SIG B field.
[0081] FIG. 13 shows an embodiment in which PSDU length information is transmitted in Qword units (4 bytes) in accordance with the present invention. In the embodiment of FIG. 12, PSDU length information is transmitted by Qword (4 bytes), rather than by byte or symbol. When length information is transmitted by Qword, the length of the length field is reduced by 2 bits compared to the case where the length of the length field is transmitted by the byte. Here, as the embodiment of FIG. 6, the PSDU has a form in which only the Qword padding field is added to the A-MPDU. In the present mode, the last Qword has a value of 3 bytes or less. Thus, the receiver MAC layer does not need to analyze the last Qword in the A-MPDU analysis, reducing the overhead compared to the FIG mode. 11.
[0082] FIG. 14 shows an embodiment in which only the PSDU length information is included in the VHT-SIG B field according to the present invention. In the embodiment of FIG. 14, only the PSDU length field, the CRC field and the termination field are included in the VHT-SIG B field having the size of 26 bits. In the present embodiment, the PSDU can be an A-MPDU having a length per byte or it can be one (A-MPDU + Qword padding) having a length per Qword. Also, in the present embodiment, the PSDU length field can be protected by the CRC field.
[0083] Hereinafter, a method for indicating the end of a frame by using the transmission duration of the L-SIG field of FIG. 4 and the MAC filling scheme of FIG. 6 will be described with reference to FIG. 15. Also, a method of combining a length indication from each user by using the length information having the Qword limit described above in the embodiment of FIG. 11 will also be described with reference to FIG. 15.
[0084] FIG. 15 shows an embodiment in which length information is represented by combining a MAC stuffing scheme and a length indication scheme according to the present invention. As shown in FIG. 15, when the two methods are combined, a method of using one termination field and a method of using two termination fields can be applied.
[0085] In the case where the number of termination fields is one as shown in the illustrated table at a lower portion in FIG. 15, the VHT data field includes service, PSDU, PHY padding, and termination padding in that order. In this case, the PHY layer performs reverse tracing by using the termination information in the last position, a Viterbi decoder has processing delay for the latter. Also, the decoder cannot finish decoding until it restores the data by the length designated in the length field VHT-SIG B. The data decoded by the length designated in the length field VHT-SIG B in the PHY layer is transferred to the MAC layer, and the received frame length has a size of (A-MPDU_Length/4)*4 (Here, Ceiling() refers to a Ceiling function). In this case, the length of VHT-SIG B indicates the length of the A-MPDU and Qword padding included in the PSDU format of FIG. 6.
[0086] When there is an additional termination field as shown in the frame illustrated in an upper portion in FIG. 15, the termination field can be added to the Qword boundary when the frame is decoded by using the length field at the receiver, thus removing the delay by the length of the reverse trace of a BCC decoder. Thus, decoder decoding can be completed faster. When data is transferred from a PHY layer to the MAC layer, data can be transferred to the MAC layer as quickly as length or reverse stroke, and in this way the MAC layer can gain in terms of processing time from the board.
[0087] Meanwhile, when a frame is transferred by using only the L-SIG transmission duration and MAC padding information without using each user's length information, the PSDU including the MAC padding is transferred entirely to the MAC layer of the receiver. Thus, the MAC layer performs the analysis even in MAC padding, generating overhead.
[0088] In the embodiment of FIG. 15, the transmitter configures the PSDU as follows.
[0089] 1) L_ampdu_x: Length of user A-MPDU x (byte unit)
[0090] 2) L_psdu_x: User A-MPDU x + Length (byte unit) of PSDU including MAC padding according to FIG. 6
[0091] 3) Ndpbs_x: a number of bits of data per symbol, value (bit unit) of user x according to MCS
[0092] 4) Nsym: a number of symbols
[0093] 5) L_padding_x: Length (byte unit) (Qword padding, null delimiter) of MAC padding according to MAC padding scheme of FIG. 6, final MAC filling
[0094] 6) Nes: number of BCC encoders
[0095] 7) number n of user frames
[0096] Meanwhile, the MAC layer performs the MAC padding of FIG. 6 as follows.
[0097] 1) Nsym_x = Ceiling((16+8 * L_ampdu_x + 6*Nes)/Ndpbs_x)
[0098] 2) Nsym=max(Nsym_1, ..., Nsym_n)
[0099] 3) L_fill_x = round((Nsym * Ndpbs_x - 16 - 6*Nes)/8) - L_ampdu_x
[00100] Here, L_padding_x designates the MAC padding size to be included for user x. In the above process, a PSDU for user x is generated by entering a suitable pad according to the size of L_padding_x and the threshold of L_ampdu_x.
[00101] Meanwhile, a MAC layer padding insertion algorithm is as follows.
[00102] If (Ceiling(L_ampdu_x/4)*4 <= (L_ampdu_x+L_fill_x)
[00103] Insert Fill Qword
[00104] Still
[00105] Insert the final padding MAC of L_padding_x bytes and complete the PSDU generation
[00106] When a padding space remaining is greater than or equal to 4 bytes, a null delimiter in units of 4 bytes is inserted. Also, when a space of 3 bytes or less remains, a final byte MAC pad is inserted to complete PSDU generation.
[00107] The MAC layer of the transmitter transmits Nsym, L_ampdu_x, MCS per user, and PSDU per user to the PHY layer through VECTOR TX. The PHY layer of the transmitter inserts a PHY attenuator through the Npad_x and inserts a termination pad having the size of 6*Nes according to the results of the formula below.
[00108] L_qwordinB: It is worth indicating the length of the A-MPDU by the Qword in the Qword limit and it is transmitted through the VHT-SIG B
[00109] Npad_x: Length (bit unit) of user x PHY padding
[00110] Nsym = information transferred to a receiver via L-SIG transmission duration information
[00111] Ndata_x = Nsym * Ndbps_x
[00112] Npad_x = (Ndata_x - (16 + 6*Nes)) % 8; PHY Pad(0~7)
[00113] L_qwordinB = Ceiling(L_ampdu_x/4)
[00114] When an additional terminating attenuator is required, a position to be replaced by the terminating pad is determined according to the following conditions.
[00115] If (L_psdu_x >= L_qwordinB*4)
[00116] First termination position = N_pos_first_termination = 16 + 32 x L_qwordinB
[00117] Still
[00118] Do nothing
[00119] The additional termination padding replaces the MAC padding, so the A-MPDU, a current user frame, is transferred as-is. MAC padding is merely padding information, rather than meaningful data, so it does not affect user data transmission. In the case where a front portion of a first null delimiter of the MAC pad is replaced, when only the transmission duration of L-SIG and the MAC pad are used, the null delimiter is recognized as an error and the procedure is carried out continuously until a next null delimiter
[00120] The position to be replaced by the last termination pad is determined by the formula below.
[00121] Second termination position = N_pos_second_termination = Ndata_x - 6*Nes
[00122] The receiver can discriminate the length of a user frame as follows according to a frame edge detection method. Here, the size of data transferred to the MAC layer is determined according to the user frame length.
[00123] At the receiving end using each user's VHT-SIG B length information, the length of the Rx vector, the user frame length, transferred to the MAC layer is determined by the following formula.
[00124] If (L_psdu_x >= L_qwordinB*4)
[00125] Rx Vector Length = L_qwordinB*4 (byte unit)
[00126] Termination position = 16 + 32 x L_qwordinB (bit unit)
[00127] Still
[00128] Length of Vector Rx = round ((Nsym x Ndpbs_x - 16 - 6*Nes)/8) (byte unit)
[00129] Termination position = Ndata_x - 6
[00130] When MAC padding is applied to L-SIG transmission duration, Rx Vector length, user frame length transferred to MAC layer in receiver is determined by the following equation.
[00131] Length of Vector Rx = round ((Nsym * Ndpbs_x - 16 - 6*Nes)/8) (byte unit)
[00132] Termination position = Ndata_x - 6
[00133] FIG. 16 shows embodiments in which the further termination pad of FIG. 15 is substituted in accordance with the present invention.
[00134] FIG. 17 is a block diagram to explain an insertion of PHY padding performed in a PHY layer. When MAC padding and PHY fader bits are included, the BCC and LDPC codes all need to be encoded. Thus, the PHY filling is inserted before the scrambler. Upon receipt of the reliably generated frame, a receiver decoder performs decoding by using the VHT-SIG B field length information, so the PHY layer can obtain the energy-saving effect.
[00135] In the case of encoding using BCC as shown in FIG. 17, PHY padding (0~7 bits) is positioned behind the PSDU, and therefore, termination bits (6NES bits) are added. Filler bits are added in front of the scrambler, and the six termination bits are added before each encoder. The LDPC code does not have a termination bit like 802.11n.
[00136] FIG. 18 shows a modulation scheme of the VHT-SIG B and a data representation scheme according to a bandwidth. As described above, in an embodiment of the present invention, the transmitting terminal can variably use a frequency band in data transmission. FIG. 18 shows the VHT-SIG B field settings when the frequency bands applied for transmission are 20 MHz, 40 MHz, and 80 MHz, respectively. In FIG. 18, each VHT-SIG B includes a SIG20 field converted to 20 MHz and a termination field having the size of 6 bits.
[00137] As shown in FIG. 18, in 40 MHz and 80 MHz modes, the information of the VHT-SIG B field including the termination field is interacted with. Although not shown in FIG. 18, when the frequency is 160 MHz, 80 MHz VHT-SIG B is iterated twice.
[00138] As the VHT-SIG B field is iterated in 40 MHz and 80 MHz modes, an error restoration probability can be enhanced through the repeat code in the receiver. Namely, the receiving terminal's decoder can interactively use the value obtained through decoding, thus effectively enhancing an error decision value used in a decoder input.
[00139] FIG. 19 illustrates the PPDU format according to an embodiment of the present invention. As shown in FIG. 19, the receiving terminal sets a CCA deferral by using the LSIG-LENGTH transmission duration information and performs L-SIG protection. The length and rate of information included in the L-SIG field of FIG. 19 designates a transmission duration of the PPDU, and in the case of OFFDM symbols having a long guard interval, the length and rate of information included in the L-SIG field of FIG. 19 designates the number of symbols.
[00140] The MAC layer provides a VHT A-MPDU included in the last byte of each user stream. The same preamble structure and the same VHT A-MPDU format are used in the VHT frame of a single user (SU) and multiple users (MU). Here, since A-MPDU is used all the time, an aggregation bit indicating whether or not A-MPDU is used is not included in the VHT-SIG field. The PHY layer provides 0-bit to 7-bit PHY padding. The PHY filling is positioned in front of the termination field.
[00141] The PHY layer of the receiving terminal decodes only the useful data part by using the DWORD length included in VHT-SIG B and transfers it to the MAC layer. Here, a delimiter part and a padding part behind the useful data are not decoded and the PHY processing is stopped, obtaining an energy-saving effect.
[00142] FIG. 20 illustrates a PPDU format in accordance with another embodiment of the present invention.
[00143] The use of the length field of the VHT-SIG B as shown in FIG. 19 can get an energy saving effect on the PHY layer. Meanwhile, using the PPDU format as shown in FIG. 20 can get a power saving effect even in MAC layer.
[00144] In FIG. 20, a Null subframe positioned at the end of the A-MPDU is used as a special padding delimiter having the EOF flag information. When the MAC layer of the receiver detects the null bounding padding including the EOF flag, the MAC layer transmits an operation interrupt signal to the PHY layer, obtaining an energy saving effect.
[00145] FIG. 21 shows the configuration of a transmission terminal in accordance with an embodiment of the present invention.
[00146] A transmission terminal 2102 includes a data field generating unit 2104, a signal field generating unit 2106, a data frame generating unit 2108 and a transmission unit 2110. data field 2104 generates a data field including data (e.g., A-MPDU) desired to be transmitted to a receiving terminal. Here, the data field may include a service field and a PHY field service data unit (PSDU), and a PSDU field may include data that one wishes to transmit to the receiving terminal.
[00147] The data field generating unit 2104 can generate a PSDU field as described above in the embodiment of FIG. 15. The data field generating unit 2104 first calculates the size of a MAC pad to be added behind the data included in the PSDU as follows.
[00148] 1) Nsym_x = Ceiling((16+8 * L_ampdu_x + 6*Nes)/Ndpbs_x)
[00149] 2) Nsym=max(Nsym_1, ..., Nsym_n)
[00150] 3) L_fill_x = round((Nsym * Ndpbs_x - 16 - 6*Nes)/8) - L_ampdu_x
[00151] Therefore, the data field generating unit 2104 adds a Qword pad, a null delimiter, and a final MAC pad behind the data according to the MAC pad size as follows.
[00152] If (Ceiling(L_ampdu_x/4))*4 <= (L_ampdu_x+L_fill_x)
[00153] Insert Qword Fill
[00154] Still
[00155] Insert the final MAC pad of L_fill_x byte and complete the PSDU generation
[00156] When a padding space remaining is greater than or equal to 4 bytes, the data field generation unit 2104 inserts a null delimiter in units of 4 bytes. Also, when a space of 3 bytes or less remains, the data field generation unit 2104 inserts a final byte MAC pad and completes the PSDU generation.
[00157] The signal field generating unit 2106 generates a signal field which includes information regarding the data field generated by the data field generating unit 2104. Here, the signal field may include a length field. designating the data size and Qword padding included in the PSDU field. Also, the signal field may further include a modulation and coding scheme (MCS) field including information regarding the method of modulation and coding of the data field. Also, the service field may include a CRC bit calculated based on information included in the signal field.
[00158] The data frame generating unit 2108 generates a data frame including the generated data field and signal field. The transmission unit 2110 transmits the data frame generated by the data frame generation unit 2108 to the receiving terminal.
[00159] FIG. 22 shows the configuration of a receiving terminal in accordance with an embodiment of the present invention.
[00160] A receiving terminal 2202 includes the receiving unit 2204, the decoding unit 2206, and the data acquisition unit 2208. The receiving unit 2204 receives a data frame including a data field that includes data (per example, an A-MPDU) intended to be transmitted by a transmit terminal and a signal field that includes information regarding the data field from the transmit terminal.
[00161] The decoding unit 2206 decodes the data frame received by the receiving unit 2204 and produces the signal field and the data field. The respective fields included in the signal field and the data field have been described above with reference to FIG. 21.
[00162] The data acquisition unit 2208 obtains the data from the data field by using the signal field produced by the decoding unit 2206.
[00163] FIG. 23 is a flowchart illustrating a process of a data transmission method according to an embodiment of the present invention.
[00164] First, a data field including data (eg an A-MPDU) intended to be transmitted by a receiving terminal is generated (2302). A signal field including information regarding the generated data field is generated (2304). Therefore, a data frame including the generated data field and signal field is generated (2306).
[00165] Here, the data field includes a service field and a PSDU field and a PSDU field includes the data intended to be transmitted to the receiving terminal. Also, a PSDU field includes the data intended to be transmitted to the receiving terminal and a Qword pad, a null delimiter, and a final MAC pad added behind the data. Also, the signal field may include a length field designating the data size and Qword padding included in the PSDU field and an MCS field including information regarding the method of modulation and encoding of the data field. service may include the CRC bits calculated based on the information included in the signal field.
[00166] Finally, the generated data frame is transmitted to the receiving terminal (2308).
[00167] FIG. 24 is a flowchart illustrating a process of a data transmission method in accordance with an embodiment of the present invention.
[00168] First, a data frame including a data field including data (e.g. A-MPDU) intended to be transmitted by a transmit terminal and signal field including information regarding data field is received ( 2402). The received data frame is decoded to produce the signal field and the data field included in the data frame (24404).
[00169] Here, the data field includes the service field and a PSDU field and a PSDU field includes the data intended to be transmitted by a transmitting terminal. Also, a PSDU field includes the data intended to be transmitted by a receive terminal and a Qword pad, a null delimiter, and a final MAC pad added behind the data. Also, the signal field may include a length field designating the data size and Qword padding included in the PSDU field and an MCS field including information regarding the method of modulating and encoding the data field. Also, the service field may include CRC bits calculated based on information included in the signal field.
[00170] Finally, data is obtained from the data field by using the produced signal field (2406).
[00171] Although the present invention has been described with reference to exemplary embodiments and accompanying drawings, it will 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 (14)
[0001]
1. Wireless Communication Method, characterized in that it comprises: receiving, at a station, a Data Unit of the Physical Layer Convergence Protocol (PPDU) from a transmitter through an operation channel, the PPDU including a first field of signal, a Very High Processing Signal B field (VHT SIG-B) and VHT data; and verifying, at the station, a cyclic redundancy check (CRC) in the VHT SIG-B field, wherein the first signal field includes transmission duration information indicating a duration of the PPDU, wherein the VHT SIG-B field includes length information indicating a length of a Physical layer Service Data Unit (PSDU) and information about a modulation and encoding scheme (MCS), where the VHT data includes a service field and the PSDU and where the field service includes scrambler and CRC information, the CRC being calculated over the VHT SIG-B field, excluding a tail field.
[0002]
Wireless Communication Method according to Claim 1, characterized in that the VHT SIG-B field includes a bit block, wherein a number of bits of the bit block is determined based on a channel bandwidth of operation.
[0003]
Wireless Communication Method according to Claim 2, characterized in that the number of bits in the bit block is 26 bits, if the channel bandwidth is 20MHz, the number of bits in the bit block is 27-bit if the channel bandwidth is 40MHz and the number of bits in the bit block is 29 bits if the channel bandwidth is greater than 40MHz.
[0004]
4. Wireless Communication Method according to Claim 1, characterized in that the number of bits for the scrambler seed is 7 and the number of bits for the CRC is 8.
[0005]
Wireless Communication Method according to Claim 2, characterized in that the bit block is repeated a predetermined number of times in line with the bandwidth of the operating channel.
[0006]
Wireless Communication Method according to Claim 5, characterized in that the bit block is repeated twice if the channel width of the operating channel is 40MHz.
[0007]
Wireless Communication Method according to Claim 5, characterized in that the bit block is repeated four times if the channel width of the operating channel is 80MHz.
[0008]
Wireless Communication Method according to Claim 7, characterized in that the repeated block of bits is repeated twice if the channel width of the operating channel is 160MHz.
[0009]
Wireless Communication Method according to Claim 1, characterized in that the VHT SIG-B field is modulated with a binary phase shift keying (BPSK).
[0010]
Wireless LAN Apparatus, employing the method as defined in Claim 1, characterized in that the apparatus comprises: a receiving unit configured to receive a Physical Layer Protocol Data Unit (PPDU) from a transmitter via an operating channel, the PPDU including a first signal field, a Very High Processing B Signal field (VHT SIG-B) and VHT data; and a decoding unit configured to verify a cyclic redundancy check (CRC) in the VHT SIG-B field, wherein the first signal field includes transmission duration information indicating a duration of the PPDU, wherein the VHT SIG- field B includes length information indicating a length of a physical layer Service Data Unit (PSDU) and information about a modulation and encoding scheme (MCS), where the VHT data includes a service field and the PSDU and where the service field includes scrambler information and the CRC, the CRC being calculated over the VHT SIG-B field, excluding a tail field.
[0011]
Wireless LAN Apparatus according to Claim 10, characterized in that the VHT SIG-B field includes a bit block, wherein a number of bits of the bit block is determined based on a bandwidth of the operating channel.
[0012]
12. Wireless LAN Device according to Claim 11, characterized in that the number of bits in the bit block is 26 bits, if the channel bandwidth is 20MHz, the number of bits in the bit block is 27 bits if the channel bandwidth is 40MHz and the number of bits in the bit block is 29 bits if the channel bandwidth is greater than 40MHz.
[0013]
Wireless LAN Apparatus according to Claim 10, characterized in that the number of bits for the scrambler seed is 7 and the number of bits for the CRC is 8.
[0014]
Wireless LAN Apparatus according to Claim 10, characterized in that the VHT SIG-B field is modulated with a binary phase shift keying (BPSK).

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法律状态:
2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

2020-01-21| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04B 7/04 Ipc: H04B 7/26 (2006.01), H04L 1/00 (2006.01), H04L 29/ |

2020-01-21| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

2021-08-10| 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

KR20100021576|2010-03-11|

KR10-2010-0021576|2010-03-11|

KR10-2010-0022033|2010-03-12|

KR20100022033|2010-03-12|

KR20100063638|2010-07-01|

KR10-2010-0063638|2010-07-01|

KR10-2010-0066599|2010-07-09|

KR20100066599|2010-07-09|

KR10-2010-0066851|2010-07-12|

KR20100066851|2010-07-12|

KR20100068168|2010-07-14|

PCT/KR2011/001740|WO2011112052A2|2010-03-11|2011-03-11|Method and apparatus for transceiving data in a mimo system|

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