MX2007000219A - Method and apparatus for transmitting and receiving legacy format data in high throughput wireless network - Google Patents

Abstract

The present invention relates to methods and apparatuses for transmitting and receiving legacy format data in a high throughput wireless network. A method of transmitting legacy format data in a high throughput wireless network, the method comprises accessing to the wireless network;receiving first data compliant with a first protocol, wherein the first data is transmitted by a first station accessed to the wireless network;and transmitting second data compliant with a second protocol to the first station, wherein the first protocol is downward compatible with the second protocol.

Description

METHOD AND DEVICE OF TRANSMISSION AND RECEPTION OF DATA OF FORMAT OF LEGACY IN WIRELESS NETWORK OF HIGH PERFORMANCE Field of the Invention The present invention relates to a wireless network, and more particularly, to methods and apparatus for transmitting and receiving legacy format data in a high-performance wireless network, i.e. a network with a great capacity of process and data transfer. Background of the Invention Recently, there has been an increase in the demand for ultra high speed communication networks due to the widespread public use of the Internet and a rapid increase in the amount of multimedia data available. Because Local Area Networks (hereinafter referred to as LAs) emerged at the end of the 1980s, the speed of data transmission has increased dramatically from 1 to 100 Mbps. This way, the high-speed Ethernet transmission has gained popularity and widespread widespread use. Currently, intensive research - on a Gigabit Ethernet is on the way. An increase in the interest in the connection of a wireless network and the communication has activated the research and development of wireless LANs (hereinafter referred to as WLANs), and has increased the availability to a large extent of REF.178030 LANs to -consumers. Although the use of LANs could decrease performance due to lower transmission speeds and poorer stability when compared - with wired LANs, WLANs have several advantages, including wireless interconnect capability, greater mobility and so on As a result, the WLAN markets have been - growing gradually. Due to the need for higher transmission speed and the development of wireless transmission technology, the initial standard of the Institute of Electrical and Electronic Engineers and IEEE, 802.11, which specifies a transfer speed from 1 to 2 Mbps, it has evolved towards advanced standards that include the IEEE 802.11a, 802.11b and 802 standards. llg. The IEEE 802 standard. llg, which uses a transmission speed of 6 to 54 Mbps in the band of the National Information Infrastructure (NII) of 5 GHz, uses orthogonal frequency division multiplexing (OFDM) as its transmission technology. With the increase in public interest in OFDM transmission and the use of a 5 GHz band, much larger attention is being given to the IEEE 8 2. llg standard and the OFDM transmission technology than to other wireless • standards. Recently, the wireless services of the Internet that use the WLAN, that is, the so-called "Site" Network ("4Nespof") have been launched and offered by Korea Telecommunication {KT) Corporation of Korea Network Site services allow access to the Internet using a WLAN in accordance with the IEEE 802.11b standard, which is commonly called Wi-Fi (wireless fidelity) Communication standards for wireless data communication systems, which have been completed and promulgated or are being investigated and discussed, include the Broad Code Division Wide Access (WCDMA), the IEEE 802.11x standard, Bluetooth technology, IEEE 802.15.3 standard, etc., which are known as third generation (3G) communication standards.The most widely known and most economical standard of wireless data communication is the IEEE 802.11b standard, a series of IEEE 802.11x standard The IEEE 802.11b WLAN standard provides data transmission at a maximum speed of 11 Mbps and uses an Industrial, Scientific and Medical (ISM) band of 2.4 GHz, which can be used below a predetermined electric field without permission. With the recent widespread use of the IEEE 802.11a WLAN standard, which provides a maximum data rate of 54 Mbps in the 5 GHz band by using OFDM, the IEEE 802 standard. llg developed as an extension of the IEEE 802.11a standard for the transmission of data in the 2.4 GHz band using the OFDM and is being investigated intensively.

Ethernet and WLAN, which are currently being widely used, use a carrier-wide multiple access (CSMA) method. According to the CSMA method, it is determined if a channel is in use. If the channel was not in use, that is, if the channel was inactive, then the data would be transmitted. If the channel were busy, the retransmission of the data would be attempted after a predetermined period of time has elapsed. A multiple access method of carrier detection with collision detection. { CSMA / CD), which is an improvement of the CSMA method, is used in a wired LAN, while a multiple access method of carrier detection with collision avoidance (CSMA / CA) is used in wireless data based communications per package. In the CSMA / CD method, a station would suspend transmission signals if a collision was detected during transmission. Compared to the CSMA method, which pre-checks whether a channel is busy before data transmission, in the CSMA / CD method, the -station suspends the transmission of signals when a collision is detected during the transmission of signals and transmits a signal. signal of obstruction or interference to another station to inform you of the occurrence of the collision. After the transmission of the interference signal, the station has a random back-off period for the postponement and restart of the signals of transmission. In the CSMA / CD method, the station does not transmit data immediately even after the channel is inactive and has a random backward period for a predetermined duration before transmission to avoid signal collision. If a signal collision occurs during the transmission, the duration of the random retracement period will be increased by two times, which also decreases the probability of collision. The CSMA / CA method is classified into the physical detection of the carrier and the virtual detection of the carrier. The physical detection of the bearer refers to the physical detection of the active signals in the wireless medium. The virtual detection of the bearer is carried out, so that the information regarding the duration of the occupation of the medium is established in a data unit of media access control protocol (MAC) / physical service data unit (PHY) ) (MPDU / PSDU) and the data transmission is then started after the estimated duration has elapsed. However, if the MPDU / PSDU can not be interpreted, the virtual bearer detection mechanism can not be adopted. The IEEE 802.11 standard? it provides coverage for IEEE 802.11a networks in 5 GHz and in IEEE 802. llg networks in 2.4 GHz and allows stations of various data speeds to coexist. For the operation, the stations of several data speeds that use the CSMA / CA method, the stations must interpret the MPDU / PSDU. However, some stations, ie legacy stations, often would not be able to process data transmitted / received at high speeds. In this case, the legacy stations could not perform the virtual detection of the bearer. Figure 1 is a data structure of a Protocol Data Unit (PPDU) of Physical Layer Convergence Procedure (PLCP) format of the related art as defined by the IEEE 802.11a protocol. The PPDU includes a PLCP header and a Physical Capability Service Data Unit (PSDU). A data rate field 3 and a data length field 4 are used to determine the length of a data field following the PLCP header of the PPDU. The data rate field 3 and the data length field 4 are also used to determine the time of the data that is being received or transmitted, with which the virtual detection of the bearer is performed. In addition, in the case where a Message Protocol Data Unit (MPDU) is being filtered accurately from the received PPDU, a "Dur / ID" field, which is a field between the header fields of the MPDU is interpreted and the environment is virtually determined to be occupied during an expected period of time of use of the medium. In the case where a preamble field and a signal field of a PPDU box are being received, they would only be erroneously interpreted, the media could attempt to transmit data by backspace in an Extended Space between Frames (EIFS), which is longer than the Space between Frames (DIFS) of Distributed Coordination Function (DCF), so that the legitimacy in the media access of all stations available in DCF is not guaranteed. In a network where an existing station coexists using a conventional protocol or a legacy station and a High Performance (HT) station, the legacy station could be updated or modernized for the transmission and reception of HT data. However, a legacy station or a conventional station could not perform the virtual detection of the carrier because these stations can not interpret the "Dur / ID" field present in the data that was transmitted and received by the HT station. Figure 2 is a diagram illustrating that a legacy station with a low transmission rate is unable to perform virtual detection of the carrier when a plurality of stations having a variety of transmission capabilities coexist. A high performance station - on the transmitter side (abbreviated as HT STA on the transmitter side) 101 is a station that complies with the IEEE 802.11 protocols? and it works using a channel joining technique or a multi-input-multiple output (MIMO) technique. The Channel junction is a mechanism-in which data frames are transmitted simultaneously through two adjacent channels. In other words, according to a channel joining technique, because two adjacent channels are joined during data transmission, there is a channel extension. The MIMO technique is a type of adaptive series antenna technology that electrically controls the directivity using a plurality of antennas. Specifically, in a MIMO system, the directivity is improved using a plurality of antennas by decreasing the width of the beam, whereby a plurality of transmission paths are formed that are independent of each other. As a result, the data transmission speed of a device that adopts the MIMO system increases as many times as there are antennas in the MIMO system. In this regard, when the data is transmitted / received using the channel joining technique or the MIMO technique, the capable stations can read the transmitted / received data although the incapable stations, ie the legacy stations, can not read the data transmitted / received. The physical detection of the bearer allows a physical layer to report to a MAC layer if a channel is busy or inactive by detecting whether the physical layer has received a predetermined level of reception power. Therefore, the physical detection of the bearer is not associated with the interpretation of the -data transmitted and received. If the HT STA on the side of the transmitter 101 sent HT data, an HT STA on the side of the receiver 102 would receive the HT data and would transmit an acknowledgment ('ACK') HT to the HT STA on the transmitter 101 side in response to the data received HT. A traditional HT STA 103 is capable of interpreting HT data and HT recognition. Assuming a duration in which HT data and HT recognition are transmitted and received, would be set in a Network Distribution Vector (NAV), the medium would be considered to be busy. Then, the additional HT STA 103 would wait for a DIFS after a lapse of a NAV time period, and subsequently, perform a random backward, and finally transmit the data. Meanwhile, a legacy station 201 is a station that complies with the IEEE 802.11a, IEEE 802.11b or IEEE 802. llg protocols although it is unable to interpret the HT data. Therefore, after the duration of HT the acknowledgment is verified by the physical detection of the bearer, legacy station 201 would wait for the duration of an EIFS and subsequently perform a backward movement. In this way, legacy station 201 would wait longer than other stations, i.e., HT STA on transmitter side 101, HT STA on receiver side 102 and additional HT STA 103, before -sean assigned the means, with which, would adversely affect the efficiency of data transmission. The IEEE 802.11 standard specifies a control response box, such as an acknowledgment (? ACK '), a Request-to-Send (RTS) or Clear-to-Send (CTS) box, is transmitted at the same speed of data than the directly preceding table. However, if the control response box could not be transmitted at the same data rate as the directly preceding frame, it must be transmitted at a higher speed in a basic service set (BSS) as -es specified in the IEEE 802.11 standard. Furthermore, unlike the legacy format data, the HT data has the HT preamble and HT signal fields added thereto, which leads to an increase in the overload of a PPDU, which could cause the frame ACK results in impaired performance when compared to the legacy format PPDU. That is, the length of the legacy format PPDU that complies with -the IEEE 802.11a standard is approximately 20 um while the length of the recently defined HT PPDU is 40 um or larger. Accordingly, there is a need to improve the performance of network utilization by transmitting legacy format data, eg, a Recognition ('ACK') box, without a HT preamble when the station Legacy can not interpret the data transmitted from an HT station, which could prevent the virtual detection of the carrier from being carried out properly. Brief Description of the Figures Figure 1 is a schematic diagram of the PPDU of the related art format as defined by the IEEE 802.11 protocol; Figure 2 is a diagram illustrating that a station with a low transmission rate is unable to perform virtual detection of the carrier when a plurality of stations having a variety of transmission capabilities in a network coexist; Figure 3 is a diagram illustrating a method of transmitting a response frame by using a legacy method according to an exemplary embodiment of the present invention; Figure 4 is a diagram illustrating data structures of a PPDU transmitted and received by an HT station; Figure 5 is a diagram showing a procedure in which a receiving unit transmits a legacy response box when a transmission unit sends HT data using the channel link according to an exemplary embodiment of the present invention; Figure 6 is a diagram showing a procedure in which a receiving unit transmits a legacy response box when a transmission unit sends HT data using a channel link according to another example embodiment of the present invention; Figure 7 is a diagram showing a procedure in which a receiving unit transmits a legacy response box when the transmission unit sends HT data without the use of the -channel link; Figure 8 is a schematic diagram illustrating a legacy format data transmission station HT according to an embodiment of the present invention; and Figure 9 is a flowchart illustrating a method in which an HT station receives an HT frame and transmits a legacy frame as a response in accordance with an exemplary embodiment of the present invention. Brief Description of the Invention Technical Problem The present invention provides a method and apparatus that allows a legacy station to perform virtual detection of the bearer when a plurality of stations with heterogeneous capabilities coexist in a wireless network. The present invention also provides a method and apparatus for the transmission and reception of legacy format data in a high-performance wireless network, that is, with a high processing capacity and data transfer. The objectives indicated above, as well as also other objects, features and advantages of the present invention will be clear to those skilled in the art based on the revision of the following description. Technical Solution The present invention relates to a wireless network, and more particularly, to methods and apparatus for transmitting and receiving legacy format data in a high-performance wireless network. In accordance with one aspect of the present invention, a legacy format data transmission method is provided in a high performance wireless network (HT), the method comprises accessing the wireless network, receiving the first data from according to a first protocol, wherein the first data is transmitted through a first station accessed to the wireless network, and the second data according to a second protocol to the first station, wherein the first protocol is downlink compatible with the second protocol. According to another aspect of the present invention, a method of receiving legacy format data in a high performance wireless network is provided, the method comprises accessing the wireless network, transmitting the first data according to a first protocol to the first station connected to the wireless network, and the reception of the second data according to a second protocol of the first station, wherein the first station is downlink compatible with the second protocol. In accordance with yet another aspect of the present invention, a legacy format data transmission and reception apparatus is provided in a high performance wireless network (HT), the apparatus comprises a transmission unit that sends the first data in accordance -with a first protocol or the second data according to a second protocol to the wireless network, the first station supports downlink with the second protocol, a reception unit that supports the data coming from the wireless network, and a legacy transmission control unit that regulates the unit of. transmission to send the second data according to the second protocol. According to a further aspect of the present invention, a method of data transmission is provided. In a wireless network, the method comprises accessing the wireless network, receiving the first data according to a channel link, in where the first data are transmitted from a first station connected to the wireless network, and the transmission of a recognition frame ('ACK') by means of each of the channels used by the channel junction. Agree with yet another aspect of this invention, there is provided a wireless network apparatus comprising a receiving unit that accesses a wireless network and receives the first data according to the channel joining technique, wherein the first data is transmitted from a first connected station with the wireless network, and a transmission unit that sends a recognition frame ('ACK') by means of each of the channels associated with the channel junction. Detailed Description of the Invention The present invention and the methods of achieving same could be more easily understood with reference to the following detailed description of the exemplary embodiments and the accompanying figures. However, the present invention could be included in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided, so that this description will be detailed and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims. The same reference numbers indicate the same elements throughout the specification. A method and apparatus for the transmission and reception of legacy format data in a wireless network is described HT hereafter with reference to the flowchart illustrations of the methods according to the exemplary embodiments of the invention. It will be understood that each block of the illustrations of the flowchart and the combinations of the blocks in the illustrations of the flowchart can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, to a special-purpose computer, or to another programmable data processing apparatus to produce a machine, so that the instructions that are executed by means of the processor of the computer or other programmable data processing apparatus, can create the means for the implementation of the functions specified in the block or blocks of the flowchart. These computer program instructions could also be stored in a usable computer memory or capable of being read by a computer that can run a computer or other programmable data processing device so that it operates in a particular mode, so that the instructions stored in usable computer memory or capable of being read by computer produce an article of manufacture that includes instructional means that implements the function specified in the block or flowchart blocks. The instructions of the program computer could also be loaded into a computer or other programmable data processing device in order to cause a series of operational steps to be performed on the computer or other programmable device in order to produce an implemented computer process, so that the instructions that are executed in the computer or in another programmable device provide stages for the implementation of the functions specified in the block or blocks of the flow chart. Each block of the flowchart illustrations could represent a module, segment, or portion of code, comprising one or more executable instructions for the implementation of specific logical functions. It should also be noted that in some alternative implementations, the functions observed in the blocks could be out of order. For example, two blocks shown in succession could in fact be executed substantially concurrently, or in some instances the blocks could be executed in the reverse order, based on the functionality involved. HT wireless networks according to the exemplary embodiments of the present invention include wireless r-edes with the ability to transmit and receive HT data, for example, an HT wireless network that complies with the IEEE 802.11? Protocol, a wireless network that has compatibility with one of the legacy format standards IEEE 802.11a, IEEE 802.11b and IEEE 802. llg, and so on. Figure 3 is a diagram illustrating a method of transmitting a response frame by using the legacy method according to an exemplary embodiment of the present invention. The HT stations 101, 102 and 103 and the legacy station 201 coexist in a wireless network. In step S10, the HT station on the side of the transmitter 101 sends the HT data to the HT station on the side of the receiver 102. As indicated above, the HT data means the data transmitted at a high speed using an HT technique. channel union or a MIMO technique. The HT (High Performance) stations include stations that adapt to the protocol that allows the transmission of high speed data, for example, stations according to the IEEE 802.11 ?. Because the HT station on the receiver side 102 and the additional HT station 103 can interpret the HT data, they perform the virtual detection of the bearer. However, because legacy station 201 is not capable of interpreting HT data, it can not perform virtual detection of the bearer. Instead, the legacy location determines that a medium is currently occupied, whereby the physical detection of the bearer is performed. After completing the transmission of the HT data, the Sil operation begins and the retracement could be performed after the -wait of an EIFS duration. If the HT station on the side of the transmitter 101 completes the transmission of the HT data, the procedure would continue to the Sil operation. At this time, the HT station on the receiver side 102 transmits a legacy response box after a duration of a SIFS. The legacy response box is a 1ACK 'recognition frame generated according to the 802.11a, 802.11b or 802. llg protocol. The legacy response box can be transmitted and received both from a legacy station - and from an HT station. After receipt of each legacy response box, each of the HT 101, 102, 103 stations interprets a legacy response box and when the legacy response box is terminated, the HT 101, 102 and 103 stations continue to operation S12 and perform a rollback procedure after the duration of a DIFS. In addition, because the legacy station is able to interpret a legacy response box though it is unable to interpret the HT data, it is allowed to wait for the duration of the DIFS in operation S12 to prevent the station from legacy 201 perform the backing procedure. Accordingly, the legacy station 201 is able to participate in the backing procedure, as well as the HT 101, 102 and 103 stations, thereby preventing performance deterioration.

Figure 4 is a diagram illustrating a structure of a PPDU transmitted and received by an HT station according to an exemplary embodiment of the present invention. The HT station allows the transmission and reception of data in two ways. Because the two forms begin with legacy preambles, the two forms are structured so that they are interpreted by the legacy stations. A legacy format PPDU (PLCP Protocol Data Unit) (30) includes an L-STF (Short Legacy Training Field), an L-LTF (Long Legacy Training Field) and an L-SIG (Field of Legacy Signal) and a DATA payload. Similar to Figure 1, the L-SIG includes the v Speed of Data Transmission, Reserved Bits, LENGTH, Parity, and Final Bits. The legacy format PPDU has the DATA payload next to L-STF, L-LTF, L-SIG. The L-STF, L-LTF, L-SIG contain the information - with respect to the power handling, the signal and so on, respectively. The legacy data follows the legacy preamble. In this way, the legacy preamble 30 can be interpreted by both the HT station and the legacy station. When a PPDU 40 has an HT preamble added to the legacy preamble, the HT station would consider the PPDU 40 to be the HT data. The preamble HT contains the information with respect to the HT data. The preamble HT consists of an HT- SIG, an HT-STF and an HT-LTF. The HT-STG consists of multiple fields that include an HT data length (length) an MCS information that defines modulation and coding (MSC) schemes and bits that specify the presence of advanced encoding, a sound packet that indicates if the transmission has been made in all the antennas (Sound Package) the number of HT-LTFs in a transmitted PPDU (HT-LTF number), a short GI that specifies if a short protection interval is applied to the region of data of a frame (GI Short), an initial value of a mixer (ScramblerINIT), the information that indicates whether the PPDU is converted into a signal in a bandwidth of 20 or 40 MHz (20/40 BW), and a CRC field of error verification. The HT data follows the HT-SIG that contains the above information, HT-STF and HT-LTFs as well as the number of HT-LTFs indicated in the HT-SIG. As shown in Figure 4, if short data were transmitted in the HT PPDU 40, a considerable increase in the HT preamble would be caused, which would significantly increase the overload. Therefore, in order to transmit frames that include only data-shorts, for example, control boxes, it would be efficient to use the legacy PPDU 30. In addition, the legacy PPDU 30 would allow a legacy station to perform the virtual detection of the carrier - when the legacy station exists in a wireless network. Figure 5 is a diagram - showing a method in which a receiving unit transmits a legacy response box when a transmission unit sends HT data using the channel join according to an exemplary embodiment of the present invention. When a transmission unit selects two adjacent channels of a current channel, ie the current channel and a directly next channel or a directly preceding channel and the current channel, linked together, and transmits them to the receiving unit, the reception unit admits them and transmits a legacy response box to each channel. Figure 5 shows an example in which each antenna is unable to handle different channels. An HT station on the receiver side employs an overlay mode in which the data containing a legacy response box 30 is superimposed from a lower sub-channel in a higher sub-channel through a single antenna 181 In this example, the legacy response box 30 can be transmitted through the upper and lower sub-channels. In addition, the legacy response box 30 can be received by the HT stations and the legacy stations exist in the upper and lower sub-channels. A PPDU-which includes a legacy response box consists of an L- "STF (Short Legacy Training Field), an L-LTF (Long Legacy Training Field), an L-SI <3 ^ Field of Legacy Signal) and a DATA pad (Legacy Data), as described above with reference to Figure 4. Figure 6 is a diagram showing a procedure in which a receiving unit transmits a legacy response box when the transmission unit sends HT data using the channel junction according to Another embodiment of the present invention, in which the antennas 181 and 182 transmit data to the different channels, unlike Figure 5. When the transmission unit selects two adjacent channels of a current channel, ie the channel current and a directly following channel or a directly preceding channel and the current channel, linked together, and transmits them to the receiving unit, the receiving unit admits them and transmits a legacy response box to any channel. Unlike Figure 5, the respective antenna 181 and 182 are capable of handling different channels. The receiving unit accesses the lower and upper sub-channels using the respective antennas 181 and 182 and transmits them to the legacy-response box 300. A structure of a legacy format frame is the same as described in FIG. Figure 4. Legacy format data is transmitted - simultaneously, to both the control channel and the extension channel in response to a frame transmitted using the channel junction, as shown in Figures 5 and, which allows -that the legacy format data is also received by the stations in the extension channel. Figure 7 is a diagram showing a procedure in which an HT station on the receiver side transmits a legacy response box when the HT station on the transmitter side sends HT data without using the channel join technique in accordance with an exemplary embodiment of the present invention. When the HT station on the transmitter side sends HT data using a MIMO technique, the HT station on the receiver side uses an antenna 181 to transmit a legacy response box by means of a current channel. The HT station on the transmitter side is capable of receiving a supported legacy response box through the current channel. Other HT stations can interpret the legacy response box to allow virtual detection of the bearer. In addition, legacy stations that communicate through the current channel can also interpret the legacy response box. A structure of the legacy format box is the same as described in Figure 4. As illustrated in Figures 5-7, the HT station on the receiver side transmits the legacy PPDU in various modes according to the method of transmission used by the HT station on the transmitter side. The HT station on the receiver side can be informed of the transmission method used by the HT station on the transmitter side from the MCS values in the HT-SIG field of the HT PPDU shown in Figure 4. That is, the number of antennas used in the data transmission or the number of spatial flows, modulation schemes used, coding rate, protection interval and the use or non-use of the joining technique channel (40 mHz mode) can be deduced from the CS values listed in the table below. Table 1 illustrates an Example Table of a modulation and coding scheme (MCS). Table 1 An HT station can transmit not only the response box but also a PPDU of a control box that includes short data such as a Clear-for-Send (CTS) box or a Ready-to-Send (RTS) box. During the transmission of the legacy format, a legacy station could perform the virtual detection of the bearer. During the transmission of the legacy format, it is not necessary to add a HT preamble to the data. Therefore, the overload could be reduced when a small amount of data is transmitted. In a case of a considerable amount of data, a PPDU of HT format would be transmitted. In a case of short data, that is, a small amount of data, for example, a control box, a legacy format PPDU would be transmitted, thereby reducing the total amount of data transmitted and received in the network wireless tot.al and a wireless network is implemented in the - which coexist the HT station and the legacy station. The term "unit" as used herein, means, but is not limited to, a software or hardware component or module, such as a Field Programmable Gateway Series (FPGA) or Application Specific Integrated Circuit (ASIC), that performs certain tasks. A unit could be configured, advantageously, to reside in the addressable storage medium and could be configured to be executed in one or more processors. Therefore, a unit could include, by way of example, components such as software components, object-oriented software components, class-components and task components, processes, functions, attributes, procedures, subroutines, code segments. program, drivers, x firmware ', micro-codes, sets of circuits, data, databases, data structures, tables, series and variables. The functionality provided in the components and units could be combined in a smaller number of components and modules or in separate and additional components and units. In addition, the components and units could be implemented, so that they are executed in one or more CPUs in a communication system. Figure 8 is a schematic illustrating an HT station transmitting legacy format data according to an exemplary embodiment of the present invention. The HT station 100 includes a transmission unit 110, a reception unit 120, a coding unit 130, a decoding unit 140, a control unit 150, a legacy transmission control unit 160 and two antennas 181 and 182 The antennas 181 and 182 receive and transmit wireless signals. The transmission unit 110 sends the signals to the antennas 181 and 182 and the coding unit 130 encrypts the data to generate the signals that will be transmitted to the antennas 181 and 182 by the transmission unit 110. In order to transmit the signals by means of two or more antennas using a MIMO technique, the data have to be divided and subsequently encoded separately. Alternately, in order to transmit signals using the channel joining technique, the transmission unit 11? select two channel-es adjacent, including a current channel and a directly next channel or a directly previous channel, which will be linked together, and transmit the signals through the joined channels. The receiving unit 120 accepts the signals that come from the antennas 181 and 182, and the decoding unit 140 decrypts the signals admitted by the receiving unit 120 into data. When the data is received using a MIMO technique, it is necessary to integrate the data transmitted through the two channels. The transmission control unit of Legacy 160 regulates short-length data, for example, a response box (¾AC 'recognition), a CTS box or an RTS box to be transmitted in a Legacy format. The control unit 150 handles and regulates the exchange of information between the different elements of the HT 100 station. Figure 9 is a flow diagram <; Jue illustrates a procedure in which an HT station receives an HT frame and transmits a legacy frame as a response frame according to an exemplary embodiment of the present invention. The HT station has access to the wireless network in operation S301. In this case, access to the wireless network includes not only access to the existing wireless network but also to the newly generated wireless network. In an example embodiment, operation S301 could include the generation of a basic service set (BSS), such as the operation of an Access Point (AP). Next, a first station in the wireless network receives the first data according to a first protocol in step S302. The first protocol includes protocols that allow the transmission and reception of data at a high speed, for example, the IEEE 802.11 ?. In addition, the first protocol could include protocols that have downlink compatibility with the legacy format protocols. The term "downlink compatibility" that is used herein means that an updated protocol or software is compatible with the proposed protocols or software. For example, the IEEE 802.11 protocols? they can interpret data that is transmitted and received in the IEEE 802.11a, IEEE 802.11b or IEEE 802. llg protocol, and can transmit / receive HT data according to the interpretation. The same is true when the updated software is available to allow the data generated from the existing software version to be interpreted or managed. After receiving the first data, it is determined whether the first data is transmitted using the channel joining technique in step S310. If the first data were transmitted using the channel binding technique, the second data according to the second protocol they would be transmitted by means of the respective channels used with the channel junction in step S320. According to the second protocol, the frames that can be interpreted by the legacy stations that receive the channels associated with the channel-junction are transmitted. Therefore, if the first protocol were in accordance with the IEEE 802.11 standard, the second protocol would include protocols with the IEEE 802.11 protocol? which is downlink compatible, for example, IEEE 802.11a, 802.11b, 802. llg, or the like. The transmission procedures have been described above with reference to Figure 5. If the first data were transmitted without the use of the channel junction (NO in operation S310), that is, if the first data were transmitted using, for example, a MIMO technique, the second data according to the second protocol would be transmitted in operation S330. The transmission procedure has been described above with reference to Figure 6. As described above, the second protocol includes protocols with which the first protocol is downlink compatible. The wireless network shown in Figure 9 could be a BSS with an AP, or an Independent Basic Service Set (IBSS) without an AP. The second data is data-shorts that include control-boxes such as 'ACK', CTS, RTS, etcetera. The second data can be interpreted by the legacy stations, so that the legacy stations can perform the virtual detection of the bearer. Consequently, the use of the second data improves the efficiency of the transmission in a wireless network without the legacy stations. It will be understood by those of ordinary skill in the art that various changes in form and details could be made therein without departing from the spirit and scope of the present invention as defined by the following claims. Therefore, it will be appreciated that the exemplary embodiments described above are for the purpose of illustration only and should not be construed as limiting the invention. The scope of the invention is given by the appended claims, rather than by the foregoing description, and all variations and equivalents that fall within the range of the claims are intended to be included therein. Industrial Applicability As described above, according to an exemplary embodiment of the present invention, when HT stations and legacy stations coexist with different transmission capabilities in a wireless network, the legacy stations can perform the virtual detection of the carrier In addition, in accordance with the exemplary embodiments of the present invention, the short data is transmitted in a legacy format, thereby improving the efficiency of the transmission. It is noted that in relation to this date the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (62)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. A method of transmitting legacy format data in a high performance wireless network, characterized in that it comprises: accessing the wireless network; receive the first agreement data -with a first protocol, where the first data is transmitted by a first station accessed to the wireless network; and transmitting the second data according to a second protocol to the first station, wherein the first protocol is downlink compatible with the second protocol.
2. 2. The method according to claim 1, characterized in that the second data comprises a control panel. 3. The method according to claim 1, characterized in that the second data comprises a reply frame transmitted in response to the result of receiving the first data or a Clear-for-Send frame or. 4. The method according to claim 1, characterized in that the wireless network is- compliance with the IEEE 802 standard. 11 ?, the first protocol includes the -IEEE 802.11 standard ?, and the second protocol is one of the IEEE 802.11 standard, the IEEE 802 standard. 11b and the IEEE 802 standard. llg. 5 . The method according to claim 1, characterized in that when the first data is transmitted using a channel binding mode, the transmission of the second data comprises - the sending of the second data by means of each of the channels used by the channel. channel union. 6. The method according to claim S, further characterized in that it comprises the reference to the information with respect to the transmission mode included in the first data, before sending the second data. The method according to claim 5, characterized in that the transmission of the second data comprises the sending of the second data separately and simultaneously by means of each of the channels used by the channel junction. 8 The method according to claim 5, characterized in that the transmission of the second data comprises the sending in identical form of the second data by superimposing a lower sub-channel on an upper sub-channel associated with the channel junction. 9. The method according to claim 1, characterized in that when the first data are transmitted using the technique of multiple inputs-multiple outputs, the transmission of the second data comprises the sending of the second data by means of a channel through which the first data have been received. The method according to claim 1, characterized in that the wireless network comprises a high performance station < HT) and a legacy station, the HT station transmits and receives data according to the first protocol and data according to the second protocol, and the legacy station transmits and receives data according to the second protocol. The method according to claim 1, characterized in that the wireless network comprises at least two high performance stations (HT), at least two HT stations transmit and receive data according to the first protocol and data according to the second protocol. 12. A method of receiving legacy format data in a high-performance wireless network, characterized in that it comprises: accessing the wireless network; transmitting the first data according to a first protocol to a first station connected to the wireless network; and receive the second data according to a second protocol from the first • station, where the first protocol is downlink compatible with the second protocol. 13. The method according to claim 12, characterized in that the second data comprises a control box. The method according to claim 12, characterized in that the second data comprises a reply frame transmitted in response to the transmission of the first data or a Clear-for-Send frame. 15. The method according to claim 12, characterized in that the wireless network is in compliance with the IEEE 802.11 standard, the first protocol includes the IEEE 802.11? Standard, and the second protocol is one of the IEEE 802.11a standard, the IEEE 802.11b standard and the IEEE 802.11g standard. 16. The method according to claim 12, characterized in that when the first data is transmitted using a channel binding mode, the reception of the second data comprises the admission of the second data by means of each of the channels. It is used by the channel junction. 17. The method according to claim 12, characterized in that when the first data are transmitted using the technique of multiple inputs-multiple outputs, the reception of the second data comprises the admission of the second data by means of a channel through which the first data has been transmitted. The method according to claim 12, characterized in that the wireless network comprises a high performance station (HT) and a legacy station, the HT station transmits and receives data according to the first protocol and data according to the second protocol, and the legacy station transmits and receives data according to the second protocol. The method according to claim 12, characterized in that the wireless network comprises at least two high performance stations (HT), at least the two HT stations transmit and receive data according to the first protocol and data according to the second protocol. 20. An apparatus for the transmission and reception of legacy format data in a high-performance wireless network, characterized in that it comprises: a transmission unit that sends the first data according to a first protocol or the second data according to a second protocol to the wireless network, the first protocol is downlink compatible with the second protocol-a reception unit that accepts the data coming from the wireless network; Y a legacy transmission control unit that regulates the transmission unit to send the second data according to the second protocol. twenty-one . The apparatus according to claim 20, characterized in that the second data comprises a control panel. 22 The apparatus according to claim 20, characterized in that the second data comprises a reply frame transmitted in response to the transmission of the first data or a Clear-for-Send frame. 2.
3. 3 . The apparatus according to claim 20, characterized in that the wireless network is in accordance with the IEEE 802 standard. 11 ?, the first protocol is in accordance with the IEEE 802 standard. 11 ?, and the second protocol is one of the IEEE 802 standard. 11a, the IEEE 802 standard. 11b and the IEEE 802 standard. llg. 24 The apparatus according to claim 20, characterized in that when the receiving unit has admitted the data using the channel joining mode, the legacy transmission control unit regulates the transmission unit to send the second data by means of each one of the channels used by the channel junction. 25 The apparatus according to claim 24, characterized in that the legacy transmission control unit refers to the information with respect to the mode of transmission. transmission included in the first data. 26 The apparatus according to claim 24, characterized in that the transmission unit sends the second data simultaneously through each of the channels used by the channel junction. 27 The apparatus according to claim 24, characterized in that the transmission unit sends the second data identically by superposing a lower sub-channel in a higher sub-channel associated with the channel junction. 28 The apparatus according to claim 20, characterized in that when the receiving unit accepts the data using the technique of multiple inputs-multiple outputs, the transmission unit sends the second data by means of the channel through which the first data has been received. 29 The apparatus according to claim 20, characterized in that the wireless network comprises an HT station and a legacy station, the HT station transmits and receives data according to the first protocol and data according to the second protocol, and the legacy transmits and receives data according to the second protocol. 30 The apparatus according to claim 20, characterized in that the wireless network comprises two or more HT stations, the two or more HT stations transmit and receive data according to the first protocol and data according to the second protocol. 31. A method of transmitting data in a wireless network, characterized by comprising: supplying the wireless network; receiving the first data according to the channel junction, wherein the first data is transmitted from a first station connected to the wireless network; and transmit a recognition frame ('ACK') by means of each of the channels used by the channel junction. 32. The method according to claim 31, characterized in that the wireless network is in compliance with the IEEE 802.11 standard, the first data are in accordance with the IEEE standard 802.11 ?, and the recognition frame "ACK" is finds in accordance with IEEE 802.11a standard, the IEEE 802.11b standard or the IEEE 802. llg standard. 33. The method according to claim 31, characterized in that the transmission of the recognition frame 'ACK' comprises the transmission of the recognition frame 'ACK' simultaneously to the respective associated channels in the channel junction. 34. The method according to claim 31, characterized in that the recognition frame 'ACK' is data of legacy format. 35 A wireless network apparatus, characterized in that it comprises: a receiving unit that accesses a wireless network and receives the first data according to the channel connection, wherein the first data is transmitted from a first station connected to the network wireless; and a transmission unit that sends a recognition frame ('ACK') by means of each of the channels associated with the channel junction. 36 The wireless network apparatus according to claim 35, characterized in that the wireless network is in compliance with the IEEE 802 standard. 11 ?, the first data are in accordance with the IEEE 802 standard. 11 ?, and the recognition frame 'ACK' are the data in accordance with the IEEE 802 standard. 11a, the IEEE 802 standard. 11b or the IEEE 802 standard. llg. 37 The wireless network apparatus according to claim 35, characterized in that the transmission unit sends the recognition frame 'ACK' separately and simultaneously to each of the channels associated with the channel junction. 38 The wireless network apparatus according to claim 35, characterized in that the recognition frame 'ACK' is legacy format data. 39. A method of transmitting data in a wireless network, characterized by comprises: accessing the wireless network; receiving the first data according to the channel junction, wherein the first data is transmitted from a first station connected to the wireless network; and transmitting the second data by means of each of the channels used by the channel junction, where the second data is a Clear-for-Send frame or a Send-Request frame. 40. The method according to claim 39, characterized in that the wireless network is in compliance with the IEEE 802.11 standard, the first data are in accordance with the IEEE 802.11 standard, and the second data are in accordance with the IEEE 802.11a standard, the IEEE 802.11b standard or the IEEE 802. llg standard. 41. The method according to claim 39, characterized in that the transmission of the recognition frame 'ACK' comprises the sending of the second data simultaneously to the respective associated channels in the channel junction. 42. The method according to claim 39, characterized in that the second data is legacy format data. 43. A wireless network device, characterized in that comprises: a receiving unit that accesses the wireless network and receives the first data according to the -channel connection, where the first data is transmitted from a first connected station -with the wireless network; and a transmission unit that sends the second data by means of each of the associated channels-with the channel junction, where the second data is a Clear-for-Send frame or a Send-Request frame. 44 The wireless network apparatus according to claim 43, characterized in that the wireless network is in accordance with the IEEE 802 standard. 11 ?, the first data are in accordance with the IEEE standard I 802. 11 ?, and the second data is data in accordance with the IEEE 802 standard. 11a, the IEEE 802 standard. 11b or the IEEE 802 standard. llg. Four. Five . The wireless network apparatus according to claim 43, characterized in that the transmission unit sends the second data separately simultaneously to each of the channels associated with the channel junction. 46 The wireless network apparatus according to claim 43, characterized in that the second data is legacy format data. 47 A method of receiving data in a wireless network, characterized in that it comprises: access the wireless network; transmitting the first data according to the channel link to a first station connected to the wireless network; and receive a recognition chart ('ACK') transmitted by each of the channels used by the channel union from the first -station. 48 The method according to claim 47, characterized in that the wireless network is in accordance with the IEEE 802 standard. 11 ?, the first data are in accordance 'with the IEEE 802 standard. eleven? , and the recognition frame 'ACK' is in accordance with the IEEE 802 standard. 11a, the IEEE 802 standard. 11b or the IEEE 802 standard. llg. 49 The method according to claim 47, characterized in that the reception of the recognition frame 'ACK' comprises the admission of the recognition frame 'ACK' transmitted simultaneously by means of each of the channels used by the channel junction. fifty . The method according to claim 47, characterized in that the recognition frame 'ACK' is data of legacy format. 51 A wireless network apparatus, characterized in that it comprises: a transmission unit that transfers to a network wireless and sends the first data according to the channel junction to a first station connected to the wireless network; and a receiving unit that supports a recognition frame ('ACK'), wherein the recognition frame * ACK 'is transmitted by means of each of the channels associated with the channel-join from the first station. 52. The wireless network apparatus according to claim 51, characterized in that the wireless network is in accordance with the IEEE 802 standard. The first data are in accordance with -the IEEE 802.11 standard ?, and the 4ACK 'recognition is in accordance with the IEEE 802.11a standard, the IEEE 802.11b standard and the IEEE 802 standard. llg. 53. The wireless network apparatus according to claim 51, characterized in that the receiving unit admits the recognition frame 'ACK' transmitted simultaneously by means of each of the channels-is used by the channel junction. 54. The wireless network apparatus according to claim 51, characterized in that the recognition frame 'ACK' is legacy format data. 55. A method of receiving data in a wireless network, characterized in that it comprises: accessing the wireless network; transmitting the first data according to the channel link to a first station connected to the wireless network; and receiving the second data transmitted by means of each of the channels used by the channel link from the first station, where the second data is a Clear-for-Send box or a Send-Send box . 56. The method according to claim 55, characterized in that the wireless network is in compliance with the IEEE 802.11 standard, the first data are in accordance with the IEEE 802.11 standard, and the second data are in accordance with the IEEE 802.11a standard, the IEEE 802.11b standard or the IEEE 802. llg standard. 57. The method according to claim 55, characterized in that the reception of the recognition frame 'AC' comprises the admission of the second data transmitted simultaneously by means of each of the channels used by the channel junction. 58. The method according to claim 55, characterized in that the second data is legacy format data. 59. A wireless network device, characterized in that it comprises: a transmission unit that accesses a network wireless and sends the first data in agreement -with the channel junction to a first station connected to the wireless network; and a receiving unit that supports the second data, wherein the second data is transmitted by means of each of the channels associated with the channel link from the first station and is a Clear-for-Send frame or a Send-Request box. 60. The wireless network apparatus according to claim 59, characterized in that the wireless network is in compliance with the IEEE 802.11 standard, the first data is in accordance with the IEEE 802.11 standard, and the second data is They are in accordance with the IEEE 802.11a standard, the IEEE 802.11b standard or the IEEE 802. llg standard. 61. The wireless network apparatus according to claim 59, characterized in that the receiving unit accepts the second data transmitted simultaneously by means of each of the channels used by the channel junction. 62. The compliant wireless network apparatus with claim 59, characterized in that the second data is legacy format data.