JP2008507233A - Method and apparatus for transmitting / receiving legacy data over high-speed wireless network - Google Patents

Abstract

A method and apparatus for transmitting and receiving legacy data over a high-speed wireless network are provided.
Connecting to a wireless network; receiving first data transmitted by a first station connected to the wireless network according to a first protocol; and second data according to a second protocol providing downward compatibility by the first station. Transmitting legacy data over a high-speed wireless network including transmitting to a first station.

Description

  The present invention relates to a wireless network, and more particularly, to a method and apparatus for transmitting / receiving legacy data in a high-speed wireless network.

  Recently, the demand for ultra-high-speed communication networks has increased due to the spread of the Internet and the rapid increase in multimedia data. Among these, a LAN (local area network), which was introduced from the latter half of the 1980s, is generally used high-speed Ethernet (registered trademark) whose transmission amount was about 1-4 Mbps at the beginning and is now 100 Mbps. Recently, research on Gigabit Ethernet (registered trademark) has been actively conducted. On the other hand, attempts to communicate by connecting to a network wirelessly promote research and development for wireless LAN (hereinafter referred to as WLAN), and as a result, the spread of WLAN has been gradually spread recently. WLANs have a lower data performance and stability than wired LANs, but have the advantage that they can be configured wirelessly and have good mobility. As a result, the WLAN market is gradually growing.

  Standards such as 802.11a, 802.11b, 802.11g, and 802.11n are established by improving the IEEE 802.11 standard, which was initially 1-2 Mbps, as the demand for data transmission increases and the development of wireless transmission technology. Has been made or is being decided through a standardization meeting. In particular, 802.11a, which has a transmission rate of 6-54 Mbps in the 5 GHz band of the NII band, uses orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a transmission technology, and is interested in the use of OFDM transmission and the use of the 5 GHz band. With the increase, it is in the spotlight compared to other wireless LAN standards.

  Recently, KT (Korea Communications) is in the process of commercializing a wireless Internet service using WLAN called Nespot. Nespot refers to a service that uses the Internet using WLAN according to the IEEE 802.11b or Wi-Fi standard. There are WCDMA (Wide Code Division Multiple Access) called IEEE 3G (3G) communication, IEEE 802.11x, Bluetooth, IEEE 802.15.3, etc. as standardization completed for wireless data communication systems. Among these standards, IEEE 802.11b belonging to IEEE 802.11x is the most widely used standard that can perform wireless data communication at low cost. A WLAN that satisfies the IEEE 802.11b standard is capable of transmitting data at a maximum transmission rate of 11 Mbps and is a 2.4 Ghz band, that is, an ISM (Industrial, Scientific, Medical) band that can be used without permission under a certain electric field. Is used. Recently, WLANs that employ IEEE802.11a capable of data transmission of up to 54 Mbps using the OFDM method in the 5 GHz band are increasing in popularity.

  Currently, Ethernet (registered trademark) and WLAN, which are generally used, all use a carrier sensing multiple access (hereinafter referred to as CSMA) method. The CSMA method refers to a method of checking whether a channel is used and transmitting if the channel is not used (idle), and if not, attempting transmission again after a predetermined time. Currently, the CSMA / CD (Carrier Sensing Multiple Access Collision Detection) method, which is an improvement of the CSMA method, is used in a wired LAN, and the CSMA / CA (Carrier Sensing Multiple Access Collision Aid packet data method). Used for communication. In the CSMA / CD method, a station uses a method of interrupting signal transmission when it detects the occurrence of a collision during signal transmission. If the CSMA / CA system monitors the use of a channel (Busy) before transmission, in the CSMA / CD system, the station monitors whether there is a signal collision on the channel during signal transmission. In the CSMA / CD system, if a collision is detected during transmission of a signal, the station interrupts the transmission and transmits a jam signal to another station to notify the fact of the collision. After transmitting the jam signal, the station transmits the signal again after being delayed for a random time (random backoff). In the CSMA / CA system, even when the channel becomes free, the station does not transmit data immediately but randomly backs off after a predetermined time, and then transmits a signal to avoid signal collision. If a signal collision occurs during transmission, the random backoff time is doubled to further reduce the possibility of collision.

  In CSMA / CA, information on the time to occupy the network is set in the physical signal sensing (Physical carrier sensing) and the MPDU / PSDU (MAC Protocol Data Unit / PHY Service Data Unit). There is a virtual carrier sensing system that does not use a network. However, when the MPDU / PSDU cannot be analyzed, the virtual carrier sensing method cannot be applied.

  802.11n covers 2.4 GHz 802.11a and 5 GHz 802.11b, g, and stations having various performances coexist. However, in order for these various stations to operate in the CSMA / CA system, MPDU / PSDU must be analyzed, but there are cases where low-speed stations cannot process data transmitted and received at high speed. In this case, a low-speed station cannot perform virtual carrier sensing.

  FIG. 1 shows the configuration of a conventional PPDU (PLCP Protocol Data Unit, PLCP protocol data unit) based on the 802.11 protocol. The PPDU includes a PLCY (Physical Layer Convergence Procedure) header and PSDU. If the data rate (rate) field 3 and the data length (length) field 4 of the PLCP header of the PPDU are used, the length of the subsequent data field can be calculated. Since this value indicates the time required for data transmission / reception, virtual carrier sensing can be executed. In addition, when the MPDU can be accurately extracted from the received PPDU, the “Dur / ID” field, which is one of the header fields of the MPDU, is analyzed, and the medium is virtually in use for the scheduled use time of the medium ( Busy). Although the preamble and signal field of the PPDU frame being received have been analyzed, if an error occurs, the back-off occurs after the time of EIFS (Extended InterFrame Space) that is not a DIFS (DCF InterFrame Space) in the MAC. To participate. This makes it impossible to guarantee fairness in medium access of all stations pursued by DCF (Distributed Coordination Function).

  Therefore, an HT (High Throughput) station that transmits and receives high-speed data with improved transmission capability in a network that includes stations (legacy stations, stations that use existing protocols) whose transmission capability has not improved transmits and receives data. In this case, the virtual carrier sensing cannot be executed based on the result that the Dur / ID field existing in the data transmitted / received by the HT station cannot be analyzed.

  FIG. 2 is a diagram illustrating a case where a station having a low transmission capability cannot execute virtual carrier sensing when stations having various transmission capabilities coexist in the network.

  The HT STA 101 is a high-speed station (802.11n) high-speed station that operates in a channel bonding or MIMO (Multiple Input Multiple Output) system, and means a high data processing amount station. Channel bonding means transmitting data to two or more channels. This means a technique in which when a transmitting station transmits data, the current channel and an adjacent channel are selected, and the two channels are combined to extend the channel. MIMO is an adaptive array antenna technology that uses multiple antennas to electrically control the directionality. The directionality is reduced narrowly in the form of a beam to form several independent transmission lines. The transmission speed is doubled. By the way, if data is transmitted / received by channel bonding or MIMO method, a station suitable for such a transmission method, in other words, a station having transmission capability can read transmitted / received data, but a station (legacy station) which is not so can read it. The data cannot be read. In physical carrier sensing, the MAC layer informs whether the medium is busy or idle by detecting whether the received power is detected above a specific value in the physical layer. Therefore, it is possible without analyzing the transmitted and received data.

  When the HT STA 101 on the transmission side transmits high-speed data (HT Data), a response to the reception side 102 receiving this data is sent to the high-speed data (HT Ack). At this time, since other HT STAs 103 can analyze high-speed data (HT Data, HT Ack), the medium is used by setting a period during which HT data and HT Ack are transmitted and received as NAV (Network Allocation Vector). If the NAV period ends after the medium is considered, data can be transmitted while occupying the medium by backoff after the DIFS period.

  On the other hand, the legacy station 201 is a station based on protocols such as 802.11a, 802.11b, and 802.11g, and cannot analyze HT data. Therefore, after checking that HT Ack is completed by physical sensing, the EIFS period is set. Join the backoff after waiting. Therefore, since the medium can be allocated after waiting for a relatively longer time than the other high-speed stations 101, 102, 103, the efficiency may be low.

  On the other hand, in the 802.11 standard, a control response frame such as ACK or CTS (Clear to Send) is transmitted at the same data transmission rate as that of the immediately preceding frame or is not transmitted at the same data transmission rate. Unlike the legacy, the HT preamble and the HT signal are added to the HT frame, which is defined to be transmitted at the highest transmission rate in the rate set (BSS Basic Rate Set). In addition, the overhead of the PPDU frame due to the additional HT signal field is increased, and in the case of a small size frame such as ACK, there is a disadvantage that the efficiency is lowered rather than the legacy PPDU. In the case of 802.11a, the length of the legacy PPDU header is 20 us (802.11a), and the newly defined HT PPDU header length is 40 us or more.

  Therefore, when the low-speed legacy station cannot analyze the data transmitted by the high-speed HT station, the virtual carrier sensing is prevented from being impossible, and small data such as a response frame is transmitted at high speed without the HT preamble. There is a need for a scheme to transmit and increase network usage efficiency.

  The present invention has been devised to remedy the above problems, and the present invention provides a method for allowing a legacy station to execute a virtual carrier when stations having different transmission capabilities coexist in a wireless network. The purpose is to provide a device.

  Another object of the present invention is to increase the efficiency by transmitting in a legacy manner when the length of data to be transmitted is short.

  The present invention is not limited to the objects described above, and further objects not mentioned will be clearly understood by those skilled in the art from the following.

  The present invention relates to a wireless network, and more particularly, to a method and apparatus for transmitting / receiving legacy data in a high-speed wireless network.

  A method for transmitting legacy data in a high-speed wireless network according to an embodiment of the present invention includes: connecting to a wireless network; receiving a first data transmitted by a first station connected to the wireless network according to a first protocol; And transmitting to the first station second data according to a second protocol for which the first station provides downward compatibility.

  A method for receiving legacy data in a high-speed wireless network according to an embodiment of the present invention includes connecting to a wireless network, and transmitting first data to a first station connected to the wireless network using a first protocol. And the first station receives second data transmitted by the first station according to a second protocol that provides downward compatibility.

  An apparatus for transmitting and receiving legacy data in a high-speed wireless network according to an embodiment of the present invention may include: first data according to a first protocol or second data according to a second protocol that provides downward compatibility to the first station in the wireless network. A transmission unit that transmits data, a reception unit that receives data from the wireless network, and a legacy transmission control unit that controls the transmission unit so that the transmission unit transmits second data using the second protocol.

  A data transmission method in a wireless network according to an embodiment of the present invention includes a step of connecting to a wireless network, a step of receiving first data by a channel bonding method transmitted from a first station connected to the wireless network, and The method includes transmitting an ACK frame to each channel used for channel bonding.

  A wireless network device according to an embodiment of the present invention is connected to a wireless network, receives a first data in a channel bonding method transmitted from a first station connected to the wireless network, and is used for the channel bonding. Each of the received channels includes a transmission unit that transmits an ACK frame.

  When stations having different transmission capabilities coexist in the wireless network by implementing the present invention, legacy stations can execute virtual carriers.

  By implementing the present invention, when the length of data to be transmitted is short, it can be transmitted in a legacy manner to increase efficiency.

  Specific matters of other embodiments are included in the detailed description and the drawings.

  Advantages and features of the present invention and how to achieve them will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and can be embodied in various different forms. The present embodiments merely complete the disclosure of the present invention, and complete the scope of the invention to those skilled in the art. Provided for notification, the invention is defined only by the claims. Like reference numerals refer to like elements throughout the specification.

  Hereinafter, the present invention will be described with reference to a block diagram or a processing flowchart for explaining a method and apparatus for transmitting and receiving legacy data in a high-speed wireless network according to an embodiment of the present invention. At this time, it will be understood that the combination of each block of the processing flowchart and the flowchart is performed by a computer program instruction. These computer program instructions can be mounted on a general purpose computer, special purpose computer or other programmable data processing equipped processor so that it is performed via the computer or other programmable data processing equipped processor. Instructions generate means to perform the functions described in the flowchart blocks. These computer program instructions can be used by a computer or a computer equipped with other programmable data processing equipment to implement the function in a specific manner or can be stored in a readable memory so that it can be used by that computer. Instructions stored in a readable or readable memory can also produce manufactured items that include instruction means for performing the functions described in the flowchart blocks. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment and executed on the computer. Instructions for creating a process and performing computer or other programmable data processing equipment may also provide steps for performing the functions described in the flowchart blocks.

  Each block may also represent a module, segment, or portion of code that includes one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the block can occur out of order. For example, two blocks shown one after the other can be performed substantially simultaneously, or the blocks can be performed in reverse order from time to time by the appropriate function.

  A wireless network that can transmit and receive HT data or high-speed data, such as 802.11n, is referred to as a high-speed wireless network. In addition, according to an embodiment of the high-speed wireless network, the wireless network is compatible with the legacy 802.11a, 802.11b, and 802.11g according to the 802.11n protocol.

  FIG. 3 is a view illustrating an example of transmitting a response frame in a legacy manner according to an embodiment of the present invention. The HT stations 101, 102, 103 and the legacy station 201 coexist in the wireless network. In step S10, the transmission side HT station 101 transmits HT data to the reception side HT station 102. As described above, HT data means data transmitted at high speed using a method such as channel bonding or MIMO. The HT (High Throughput) station includes a station that conforms to a protocol that enables high-speed data transmission such as 802.11n. Since the receiving HT station 102 and the other HT stations 103 can analyze the HT data, they perform virtual carrier sensing. At this time, since the legacy station 201 cannot analyze the HT data, it cannot perform virtual carrier sensing. However, physical carrier sensing may be performed by determining that the medium is currently in use. In this case, when the transmission of the HT data is completed and the process enters step S11, backoff can be executed after waiting for the EIFS period.

  If the transmission-side HT station 101 completes the HT data transmission, the process proceeds to step S11. At this time, the receiving-side HT station transmits a legacy response frame after the SIFS period has elapsed. The legacy response frame means a response frame generated by a protocol such as 802.11a, 802.11b, or 802.11g. The legacy response frame is a frame that can be transmitted and received between the legacy station and the HT station. The HT stations 101, 102, and 103 that have received the legacy response frame all analyze the legacy response frame and, when the legacy response frame is completed, enter the step S12 and participate in backoff after the DIFS period.

  In addition, since the legacy station can also analyze the legacy response frame, when the legacy response frame ends instead of the EIFS started from the previous step S11, that is, after entering the S12 phase again, after passing the DIFS period again, the HT station Like to participate in the backoff. Therefore, the legacy station described with reference to FIG. 2 cannot prevent the HT data from being analyzed, so that the case where the legacy station participates in the backoff after waiting during the EIFS in step S12 can be prevented. As a result, legacy stations can participate in backoff evenly, and performance is not degraded.

  FIG. 4 is an exemplary diagram illustrating a structure of a PPDU transmitted and received by an HT station according to an embodiment of the present invention.

  The HT station can transmit and receive data in two ways. Since all two schemes start with a legacy preamble, they are configured to understand legacy stations.

  Legacy PPDUs (PLCP Protocol Data Units) 30 include L-STF (Legacy Short Training Field), L-LTF (Legacy Loan Training Field), L-SIG (Legacy Signal L and Payload). The SIG includes a data rate, a reserved bit, a length, a parity, and a tail bit as described in Fig. 1. Legacy PPDUs are L-STF, L-LTF, and L-SIG. The L-STF, L-LTF, and L-SIG contain information on power management and signals, and legacy data is added after the legacy preamble. All HT stations and legacy stations can be analyzed.

  On the other hand, if the HT preamble is added after the legacy preamble, the HT station knows that the received PPDU 40 is HT data. The HT preamble includes information about HT data. The HT preamble is composed of HT-SIG, HT-STF, and HT-LTF. The HT-SIG includes the length of the HT data, MCS information (MCS) defined for modulation and coding, a bit indicating whether improved coding (advanced coding), and whether or not transmission has been performed by all antennas. The sounding packet to be represented, the number of HT-LTFs in the PPDU to be transmitted (Number of HT-LTF), whether the short guard interval is applied to the data area of the frame (Short GI), the initial value of the scrambler (ScramblerINIT), and the PPDU is 20 MHz Or it is composed of information (20/40 BW) about whether the signal is signaled in the 40 MHz band, and a CRC field for error check. HT data is added after the number of HT-LTFs specified by HT-SIG, HT-STF, and HT-SIG including such information.

  As can be seen from FIG. 4, if short data is transmitted and inserted into the HT PPDU 40, overhead is generated due to more HT preambles than actually transmitted data. Therefore, when only short information such as a control frame is included, it is efficient to use the legacy PPDU 30. The legacy PPDU 30 also enables virtual carrier sensing of the legacy station when the legacy station exists in the wireless network.

  FIG. 5 is a view illustrating a legacy response frame transmitted by the receiving side when the transmitting side transmits HT data using channel bonding according to an embodiment of the present invention. When the transmission side selects a channel immediately above or directly below the current channel and unites and transmits two channels, the reception side transmits a legacy response frame to both channels. FIG. 5 is an exemplary diagram in a case where each antenna cannot handle different channels. The receiving-side HT station uses a superposition mode in which data including the legacy response frame 30 from the lower subchannel is superposed on the upper subchannel via the single antenna 181.

  In this case, the legacy response frame 30 can be transmitted through the upper subchannel, and the legacy station existing in the HT station and the upper subchannel can receive the legacy response frame 30. A PPDU including a legacy response frame includes an L-STF, an L-LTF, an L-SIG, and a data payload. The PPDU including the legacy response frame has been described with reference to FIG.

  FIG. 6 is a view illustrating a legacy response frame transmitted by a receiving side when the transmitting side transmits HT data using channel bonding according to another embodiment of the present invention. Unlike FIG. 5, the antennas 181 and 182 transmit data on different channels. When the transmission side selects a channel immediately above or directly below the current channel and unites and transmits two channels, the reception side transmits a legacy response frame to both channels. FIG. 6 is an exemplary diagram in a case where each antenna 181 and 182 can handle different channels, unlike FIG. The receiving side uses the antennas 181 and 182 to access the lower subchannel and the upper subchannel and transmit the same legacy response frame 30. The frame configuration in the legacy format is as described in FIG.

  By sending legacy data to both the control channel and the extension channel simultaneously in response to the frame sent using the channel bonding shown in FIGS. 5 and 6, the data is also received by the stations existing in the extension channel. So that

  FIG. 7 is a diagram illustrating an example in which the receiving side transmits a legacy response frame when the transmitting side transmits HT data without using channel bonding. When the transmission side transmits HT data using MIMO technology, the reception side selects one antenna 181 and sends a response frame in the legacy format in the current channel. The transmission side can receive the response frame of the legacy format received through the corresponding channel, and other HT stations can also perform the virtual carrier sensing by analyzing the legacy response frame. In addition, the legacy station existing in the corresponding channel can also analyze the legacy response frame. The frame configuration in the legacy format is as described in FIG.

  In FIG. 5 to FIG. 7, it has been described that the receiving HT station transmits various legacy PPDUs according to the scheme transmitted by the transmitting HT station. In order for the receiving HT station to know the transmission method of the transmitting HT station, it can be understood by looking at the MCS value in the HT-SIG of the HT PPDU described in FIG. The number of antennas or spatial streams used for data transmission according to the MCS values presented in Table 1, the number of spatial streams used, the modulation scheme used, the coding rate, the guard interval, and channel bonding (40 MHz) Mode). (Table 1) is an example of the MCS table.

ＨＴステーションは、応答フレーム外にもＣＴＳ（Ｃｌｅａｒ−ｔｏ−Ｓｅｎｄ）フレーム、ＲＴＳ（Ｒｅａｄｙ−ｔｏ−Ｓｅｎｄ）フレームのように短い情報を含む制御フレームのＰＰＤＵをレガシー方式で伝送できる。レガシー方式で伝送する時、レガシーステーションが仮想キャリアセンシングを実行できる。レガシー方式で伝送する時、ＨＴプリアンブルを付加する必要がないので、少量のデータを送信時にはオーバーヘッドを減らしうる。多量のデータを伝送時にはＨＴ方式のＰＰＤＵを送信し、制御フレームのような少量のデータはレガシー方式のＰＰＤＵを送信して全体ネットワークの送受信データの量を減らしてレガシーステーションと共存する無線ネットワークを具現できる。

In addition to the response frame, the HT station can transmit a control frame PPDU including short information such as a CTS (Clear-to-Send) frame and an RTS (Ready-to-Send) frame in a legacy manner. When transmitting in a legacy manner, a legacy station can perform virtual carrier sensing. When transmitting in the legacy system, it is not necessary to add an HT preamble, and thus overhead can be reduced when transmitting a small amount of data. When transmitting a large amount of data, an HT PPDU is transmitted, and a small amount of data such as a control frame is transmitted by a legacy PPDU to reduce the amount of data transmitted and received in the entire network, realizing a wireless network that coexists with legacy stations it can.

  The term “˜part” used in the present embodiment, that is, “˜module” or “˜table” is like software, FPGA (Field Programmable Gate Array) or custom-designed semiconductor (Application Specific Integrated Circuit, ASIC). By hardware component, a module performs a certain function. However, the module is not limited to software or hardware. The module can be configured to reside on an addressable recording medium or can be configured to play back one or more processors. Thus, by way of example, a module is comprised of components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, Includes microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided in the components and modules can be combined into a smaller number of components and modules or further separated into additional components and modules. In addition, the components and modules may be implemented to replay one or more CPUs in the device.

  FIG. 8 is a block diagram of an HT station that transmits legacy data according to an embodiment of the present invention. The HT station 100 includes a transmission unit 110, a reception unit 120, an encoding unit 130, a decoding unit 140, a control unit 150, a legacy transmission control unit 160, and antennas 181 and 182. The antennas 181 and 182 perform a function of transmitting and receiving radio signals.

  The transmission unit 110 transmits signals through the antennas 181 and 182, and the encoding unit 130 performs an operation of encoding data in order to generate a signal transmitted by the transmission unit 110. In order to transmit a signal via two or more antennas in the MIMO scheme, it is necessary to encode the data separately. In addition, in order to transmit a signal by the channel bonding method, the transmission unit selects a channel immediately above or directly below the current channel, binds the two channels, and transmits the signal.

  The receiving unit 120 receives signals from the antennas 181 and 182, and the decoding unit 140 performs a task of decoding the signals into data. The data received by the MIMO method needs a process of integrating these data. Data received using the channel bonding method needs to integrate data of two channels.

  The legacy transmission control unit 160 performs control so that data is transmitted in a legacy manner when data with a short length such as a response (ACK) frame, a CTS frame, or an RTS frame is transmitted. The control unit 150 is in charge of information exchange and control between the components.

  FIG. 9 is a flowchart illustrating a process in which an HT station receives an HT frame and transmits a legacy frame in response to the HT frame according to an embodiment of the present invention.

  Connect to the wireless network (S301). At this time, it does not necessarily mean that it is only connected to the generated wireless network, and includes generation of a wireless network. For example, a process of generating a BSS (Basic Service Set) such as AP (Access Point) is also included in this. And the 1st data which the 1st station which exists in this network transmitted by the 1st protocol is received (S302). As described above, the first protocol means a protocol that is transmitted and received by a high-speed method such as 802.11n. Also, it means a protocol that has legacy compatibility and downward compatibility.

  Downward compatibility means that a protocol or software that provides better performance or better functionality is compatible with a previously presented protocol or software. For example, 802.11n can analyze data transmitted and received by 802.11a, 802.11b, and 802.11g, and can transmit and receive high-speed data. In addition to the protocol, software that is upgraded while analyzing or managing the data generated by the existing version is called downward compatibility.

  After the reception, it is examined whether the first data is transmitted by the channel bonding method (S310). If the data is transmitted by the channel bonding method, the second data according to the second protocol is transmitted to the first station to each channel used for the channel bonding (S320). The second protocol means that a frame that can be analyzed by a legacy station existing in each channel is transmitted during channel bonding. Accordingly, when the first protocol is based on the 802.11n scheme, the second protocol includes a protocol for which 802.11n ensures downward compatibility, such as 802.11a, 802.11b, and 802.11g. The sending method has been described with reference to FIGS.

  On the other hand, if it is not transmitted by the channel bonding method in step S310, for example, if it is transmitted by a method such as MIMO, the second data according to the second protocol is transmitted to the channel where the first data is received. (S330). The transmission process has been described with reference to FIG. As described above, the second protocol includes a protocol that ensures downward compatibility with the first protocol.

  The wireless network in FIG. 9 is a BSS in which an AP exists, and can be an independent basic service set (BSS) in which no AP exists. The second data is short data and includes control frames such as ACK and CTS.

  The second data is data that enables the legacy station to analyze and allows the legacy station to also perform virtual carrier sensing. In addition, in the case of a wireless network that does not include a legacy station, the transmission efficiency can be improved using the second data.

  Those skilled in the art will appreciate that the present invention may be embodied in other specific forms without changing its technical spirit or essential characteristics. Accordingly, it should be understood that the above-described embodiments are illustrative in all aspects and not limiting. The scope of the present invention is expressed by the scope of the claims described below rather than by the above detailed description, and all modifications or variations derived from the meaning and scope of the claims and the equivalents thereof are defined by the present invention. Must be analyzed to be within the scope of

  The present invention can be applied to technical fields related to a method and apparatus for transmitting / receiving legacy data in a high-speed wireless network.

It is the structure of PPDU by the conventional 802.11 protocol. 6 is a diagram illustrating a case where a station having a low transmission capability cannot execute virtual carrier sensing when stations having various transmission capabilities coexist in a network. FIG. 5 is a view illustrating an example of transmitting a response frame in a legacy manner according to an embodiment of the present invention. FIG. 3 is an exemplary diagram illustrating a structure of a PPDU transmitted and received by an HT station according to an embodiment of the present invention. FIG. 6 is an exemplary diagram illustrating a case where a receiving side transmits a legacy response frame when a transmitting side transmits HT data using channel bonding according to an exemplary embodiment of the present invention. FIG. 9 is an exemplary diagram illustrating a case where a receiving side transmits a legacy response frame when a transmitting side transmits HT data using channel bonding according to another embodiment of the present invention. FIG. 6 is an exemplary diagram illustrating a case where a receiving side transmits a legacy response frame when the transmitting side transmits HT data without using channel bonding. 1 is a configuration diagram of an HT station that transmits legacy data according to an exemplary embodiment of the present invention. FIG. 4 is a flowchart illustrating a process in which an HT station receives an HT frame and transmits a legacy frame in response to the HT frame according to an exemplary embodiment of the present invention.

Claims (62)

Connecting to a wireless network;
Receiving a first data transmitted by a first protocol by a first station connected to the wireless network;
Transmitting the second data according to a second protocol to which the first protocol provides downward compatibility to the first station. The method transmits legacy data in a high-speed wireless network.   The method according to claim 1, wherein the second data includes a control frame.   The method of claim 1, wherein the second data includes a response frame or a CTS frame according to a result of receiving the first data.   The wireless network is based on 802.11n, the first protocol includes 802.11n, and the second protocol is any one of 802.11a, 802.11b, and 802.11g. A method for transmitting legacy data over a high-speed wireless network according to claim 1. When the first data is received by a channel bonding method,
The method of claim 1, wherein the transmitting includes transmitting the second data to each channel used for the channel bonding. .   6. The method as claimed in claim 5, further comprising a step of referring to information on a transmission scheme included in the first data before the transmitting step.   6. The legacy method of claim 5, wherein the transmitting includes transmitting the second data to each of the channels used for the channel bonding simultaneously. how to.   6. The high-speed transmission according to claim 5, wherein the transmitting includes superimposing the second data from a lower sub-channel to an upper sub-channel among channels used for channel bonding and transmitting the same. A method of transmitting legacy data over a wireless network. When the first data is transmitted by a MIMO scheme,
The method of claim 1, wherein the transmitting includes transmitting the second data to a channel in which the first data is received.   The wireless network is a wireless network in which an HT station that transmits and receives data according to the first protocol and data according to the second protocol coexists with a legacy station that transmits and receives data according to the second protocol. A method for transmitting legacy data over the high-speed wireless network according to claim 1.   The high-speed wireless network according to claim 1, wherein the wireless network is a wireless network including two or more HT stations that transmit and receive data according to the first protocol and data according to the second protocol. A method of transmitting legacy data. Connecting to a wireless network;
Transmitting first data according to a first protocol to a first station connected to the wireless network;
Receiving the second data transmitted by the first station according to the second protocol providing downward compatibility, and receiving the legacy data in the high-speed wireless network.   The method as claimed in claim 12, wherein the second data includes a control frame.   The method of claim 12, wherein the second data includes a response frame or a CTS frame according to a result of receiving the first data.   The wireless network is based on 802.11n, the first protocol includes 802.11n, and the second protocol is any one of 802.11a, 802.11b, and 802.11g. 13. A method for receiving legacy data in a high-speed wireless network according to claim 12. When the first data is transmitted by a channel bonding method,
The method of claim 12, wherein the receiving step is a step of receiving via each channel used for the channel bonding. When the first data is transmitted by a MIMO scheme,
The method of claim 12, wherein the receiving is receiving the second data from a channel that has transmitted the first data.   The wireless network is a wireless network in which an HT station that transmits and receives data according to the first protocol and data according to the second protocol coexists with a legacy station that transmits and receives data according to the second protocol. A method for receiving legacy data in the high-speed wireless network according to claim 12.   The high-speed wireless network according to claim 12, wherein the wireless network is a wireless network including two or more HT stations that transmit and receive data according to the first protocol and data according to the second protocol. A method of receiving legacy data. A transmitter for transmitting first data according to a first protocol to a wireless network or second data according to a second protocol for which the first protocol provides downward compatibility;
A receiving unit for receiving data from the wireless network;
And a legacy transmission control unit that controls the transmission unit so that the transmission unit transmits second data according to the second protocol. A device for transmitting and receiving legacy data in a high-speed wireless network.   The apparatus as claimed in claim 20, wherein the second data includes a control frame.   The apparatus of claim 20, wherein the second data includes a response frame or a CTS frame according to a result of receiving the first data.   The wireless network is based on 802.11n, the first protocol includes 802.11n, and the second protocol is any one of 802.11a, 802.11b, and 802.11g. An apparatus for transmitting / receiving legacy data over a high-speed wireless network according to claim 20. The legacy transmission control unit
The control unit according to claim 20, wherein when the receiving unit receives data by a channel bonding method, the transmitting unit is controlled to transmit the second data to each channel used for the channel bonding. A device that transmits and receives legacy data over high-speed wireless networks.   The apparatus according to claim 24, wherein the legacy transmission control unit refers to information on a transmission scheme included in the received data.   The apparatus of claim 24, wherein the transmitting unit transmits the second data simultaneously to each channel used for the channel bonding.   25. The legacy of the high-speed wireless network according to claim 24, wherein the transmission unit transmits the second data in the same manner by superimposing the second data on a lower subchannel to an upper subchannel among channels used for channel bonding. A device that transmits and receives data in a format When the receiving unit receives data by the MIMO scheme,
The apparatus as claimed in claim 20, wherein the transmitting unit transmits the second data to a channel in which the data is received.   The wireless network is a wireless network in which an HT station that transmits and receives data according to the first protocol and data according to the second protocol coexists with a legacy station that transmits and receives data according to the second protocol. An apparatus for transmitting / receiving legacy data over the high-speed wireless network according to claim 20.   The high-speed wireless network according to claim 20, wherein the wireless network is a wireless network including two or more HT stations that transmit and receive data according to the first protocol and data according to the second protocol. A device that transmits and receives legacy data. Connecting to a wireless network;
Receiving first data by a channel bonding method transmitted by a first station connected to the wireless network;
Transmitting a ACK frame to each of the channels used for the channel bonding.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the ACK frame is any of 802.11a, 802.11b, 802.11g, and 802.11n. 32. The data transmission method in a wireless network according to claim 31, wherein the data is based on one.   32. The method of claim 31, wherein the transmitting includes transmitting the ACK frame simultaneously to each channel used for the channel bonding.   32. The method of claim 31, wherein the ACK frame is legacy data. A receiver for connecting to a wireless network and receiving first data by a channel bonding method transmitted by a first station connected to the wireless network;
And a transmitter that transmits an ACK frame to each channel used for the channel bonding.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the ACK frame is any of 802.11a, 802.11b, 802.11g, and 802.11n. 36. The wireless network device according to claim 35, wherein the data is one-based data.   36. The radio network apparatus according to claim 35, wherein the transmitting unit transmits the ACK frame simultaneously to each channel used for the channel bonding.   36. The radio network apparatus according to claim 35, wherein the ACK frame is legacy data. Connecting to a wireless network;
Receiving first data by a channel bonding method transmitted by a first station connected to the wireless network;
Transmitting the second data to each channel used for the channel bonding, wherein the second data is a CTS frame or an RTS frame.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the second data is any of 802.11a, 802.11b, 802.11g, and 802.11n. 40. The data transmission method in a wireless network according to claim 39, wherein the data is based on one of them.   The method of claim 39, wherein the transmitting comprises transmitting the second data simultaneously to each channel used for the channel bonding.   The method of claim 39, wherein the second data is legacy data. A receiver for connecting to a wireless network and receiving first data by a channel bonding method transmitted by a first station connected to the wireless network;
And a transmitter that transmits second data to each channel used for the channel bonding, wherein the second data is a CTS frame or an RTS frame.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the second data is any of 802.11a, 802.11b, 802.11g, and 802.11n. 44. The wireless network device according to claim 43, wherein the data is based on one of them.   44. The wireless network device according to claim 43, wherein the transmission unit transmits the second data simultaneously to each channel used for the channel bonding.   44. The wireless network device according to claim 43, wherein the second data is legacy data. Connecting to a wireless network;
Transmitting first data by channel bonding to a first station connected to the wireless network;
Receiving the ACK frame transmitted to each channel used for the channel bonding by the first station, and receiving the data in a wireless network.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the ACK frame is any of 802.11a, 802.11b, 802.11g, and 802.11n. The method according to claim 47, wherein the data is based on one.   48. The method of claim 47, wherein the receiving comprises receiving the ACK frame transmitted simultaneously through each channel used for the channel bonding. .   The method of claim 47, wherein the ACK frame is legacy data. A transmitter connected to a wireless network and transmitting first data by channel bonding to a first station connected to the wireless network;
A radio network apparatus, comprising: a receiving unit configured to receive an ACK frame transmitted from the first station to each channel used for the channel bonding.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the ACK frame is any of 802.11a, 802.11b, 802.11g, and 802.11n. 52. The wireless network device according to claim 51, wherein the data is one-based data.   52. The radio network apparatus according to claim 51, wherein the receiving unit receives the ACK frame transmitted simultaneously through each channel used for the channel bonding.   The radio network apparatus according to claim 51, wherein the ACK frame is legacy data. Connecting to a wireless network;
Transmitting first data by channel bonding to a first station connected to the wireless network;
Receiving a second data transmitted to each channel used for the channel bonding by the first station, wherein the second data is a CTS frame or an RTS frame. Data receiving method.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the second data is any of 802.11a, 802.11b, 802.11g, and 802.11n. 56. The data receiving method in a wireless network according to claim 55, wherein the data is based on one of them.   The receiving of data in a wireless network according to claim 55, wherein the receiving includes receiving the second data transmitted simultaneously through each channel used for the channel bonding. Method.   The method of claim 55, wherein the second data is legacy data. A transmitter connected to a wireless network and transmitting first data by channel bonding to a first station connected to the wireless network;
And a reception unit that receives second data transmitted from the first station to each channel used for the channel bonding, wherein the second data is a CTS frame or an RTS frame. apparatus.   The wireless network is based on 802.11n, the first data is data based on 802.11n, and the second data is any of 802.11a, 802.11b, 802.11g, and 802.11n. 60. The wireless network device according to claim 59, wherein the data is based on one of them.   The radio network apparatus according to claim 59, wherein the receiving unit receives the second data transmitted simultaneously through each channel used for the channel bonding.   60. The wireless network device according to claim 59, wherein the second data is legacy data.

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