RU2349052C2 - Method and device of transmission and reception of given inherited formats in wireless network with high throughput capacity - Google Patents

Abstract

FIELD: physics, communication.

SUBSTANCE: invention concerns methods and devices for transmission and reception of data of the inherited format in a wireless network with high throughput capacity. The technical effect consists in pinch of productivity of use of a network. The method of data transmission of the inherited format with high throughput capacity (NT) contains stages on which provide access to a wireless network in a wireless network; the first data, compatible to the first report accept, and the first data are transmitted by the first station, provided access to a wireless network; the second data, compatible to the second report, the first station also transmit, thus the first report is back compatible to the second report.

EFFECT: increase of network usage productivity.

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Description

FIELD OF THE INVENTION

The present invention relates to a wireless network and, more specifically, to methods and devices for transmitting and receiving legacy data in a high bandwidth wireless network.

State of the art

Recently, there has been an increasing demand for ultra-fast communication networks due to the widespread use of the public Internet and the rapid increase in multimedia data. Since local area networks (hereinafter referred to as LANs) appeared in the late 80s, the data transfer rate has increased significantly from about 1 Mbit / s to about 100 Mbit / s. Thus, high-speed transmission over Ethernet networks has gained popularity and widespread distribution. Intensive research is currently underway on gigabit Ethernet networks. The growing interest in wireless network connections and communications has led to the research and development of wireless LANs (hereinafter referred to as WLANs) and significantly increased the availability of WLANs to consumers. Although the use of WLANs can reduce performance due to lower data transfer rates and lower stability compared to wired LANs, WLANs have various advantages, including the ability to work in wireless networks, greater mobility, etc. Consequently, the WLAN markets are gradually growing.

Due to the need for faster data transfer rates and the development of wireless technologies, the original Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, which sets data rates from 1 to 2 Mbps, has evolved into advanced standards, including IEEE 802.11a, 802.11 b and 802.11g. The IEEE 802.11g standard, which uses a data rate of 6-54 Mbps in the frequency range of the National Information Infrastructure 5 GHz (NII), uses orthogonal frequency division multiplexing (OFDM) as the transmission technology. With increasing public interest in OFDM transmission and the use of the 5 GHz frequency band, much more attention has been paid to the IEEE 802.11g standard and OFDM transmission technology than other wireless standards.

Recently, wireless Internet services using WLANs have appeared, the so-called Nespot, offered by the Korea Telecommunication Corporation (KT). Nespot services provide WLAN access to the Internet according to the IEEE 802.11b standard, often referred to as Wi-Fi (high quality wireless). Communication standards for wireless data systems have been prepared and published, or are being investigated and discussed, including wideband code division multiple access (WCDMA), IEEE 802.11x, Bluetooth, IEEE 802.15.3, etc., which are known as standards third generation communications (3G). The most widely known and most economical wireless data transfer standard is IEEE 802.11b, from the IEEE 802.11x series. The IEEE 802.11b WLAN standard provides data transfer at a maximum speed of 11 Mbps and uses the industrial, scientific and medical frequency range of 2.4 GHz (ISM), which can be used below a predetermined electric field without permission. Given the recent widespread use of the IEEE 802.11a WLAN standard, which provides a maximum data transfer rate of 54 Mbps in the 5 GHz frequency band through the use of OFDM, IEEE 802.11g is designed as an extension of the IEEE 802.11a standard for data transmission in 2, 4 GHz frequency range using OFDM, and it is being intensively studied.

Ethernet and WLANs, which are currently widely used, employ Carrier Controlled Multiple Access (CSMA). According to the CSMA method, it is determined whether the channel is being used. If the channel is not used, i.e. if the channel is free, then the data is transmitted. If the channel is busy, data is retransmitted after a predetermined period of time has elapsed. The Carrier Control and Conflict Detection (CSMA / CD) multiple access method, which is an improvement on the CSMA method, is used in a wired LAN, while the Carrier Control and Conflict Prevention multiple access (CSMA / CA) method is used in wireless packet data. In the CSMA / CD method, the station pauses the transmission of signals if a conflict is detected during transmission. Compared with the CSMA method, which pre-checks whether the channel is busy, before transmitting data, in the CSMA / CD method, the station pauses the signal transmission when a conflict is detected during the signal transmission, and transmits a conflict signal to another station to inform it of the conflict . After transmitting a conflict signal, the station has a random delay period for delaying transmission and restarts the transmission of signals. In the CSMA / CD method, the station does not transmit data immediately after the channel is released, and has a random delay period for delaying the transmission of a predetermined duration before transmission in order to avoid signal conflicts. If during the transmission a conflict arises over signals, the duration of the delay period for delaying transmission is doubled, thereby further reducing the likelihood of conflicts.

The CSMA / CA method is classified into physical carrier control and virtual carrier control. Physical carrier control means the physical control of active signals in a wireless environment. Virtual control of the carrier is carried out in such a way that the information regarding the duration of the medium’s occupation is set to the data module of the medium access layer (MAC) / service module of the physical (PHY) layer (MPDU / PSDU), and data transmission in this case starts after that how the estimated period has expired. However, if the MPDU / PSDU cannot be interpreted, the virtual carrier control mechanism cannot be applied.

IEEE 802.11n provides coverage of IEEE 802.11 networks at 5 GHz and IEEE 802.11g networks at 2.4 GHz and provides the ability to share stations with different data rates. To operate stations with different data rates using the CSMA / CA method, stations must interpret MPDU / PSDU. However, some stations, i.e. obsolete stations often cannot process transmitted and received data at high speeds. In this case, legacy stations cannot perform virtual carrier monitoring.

Figure 1 is a data structure of a physical layer convergence protocol (PLCP) data module (PPDU) of the prior art format defined by IEEE 802.11a. The PPDU includes a PLCP header and a Physical Layer Overhead Module (PSDU). The data rate field 3 and the data length field 4 are used to determine the length of the data field that corresponds to the PPDU PLCP header. The data rate field 3 and the data length field 4 are also used to determine the time of data reception or transmission, thereby realizing virtual monitoring of the carrier. In addition, in the case where the messaging protocol data module (MPDU) is accurately filtered from the received PPDU, the Dur / ID field, which is one of the MPDU header fields, is interpreted, and the medium is virtually determined to be busy for the estimated time period of using the medium. In the case where only the preamble field and the signal field of the received PPDU frame are misinterpreted, the medium may attempt to transmit data by delaying transmission to a predetermined extended inter-frame interval (EIFS), which is larger than the inter-frame interval of the distributed coordination function (DCF) (DIFS), therefore equal access for access to the environment of all stations available in DCF is not provided.

In a network that shares an existing station using a traditional protocol (or legacy station) and a high bandwidth (HT) station, the legacy station can be upgraded to transmit and receive HT data. However, an obsolete station, or a traditional station, cannot carry out virtual carrier monitoring, since this station cannot interpret the Dur / ID field present in the data transmitted and received by the HT station.

2 is a diagram illustrating that an outdated station with a low data rate does not allow virtual carrier monitoring when multiple stations having different transmission capabilities are shared.

A high throughput station 101 in a transmitter (designated HT STA of a transmitter) is a station that conforms to IEEE 802.11n protocols and operates using a channel bonding technique or a multi-channel input and multi-channel output (MIMO) technique. Linking channels is a mechanism in which data frames are transmitted simultaneously on two adjacent channels. In other words, according to the channel bonding technique, since two adjacent channels are connected during data transmission, a channel extension is created. The MIMO technique is one type of adaptive antenna array technology that electronically monitors directivity using multiple antennas. Specifically, in a MIMO system, directivity is improved by using multiple antennas by narrowing the antenna pattern, thereby forming multiple transmission paths that are independent of each other. Therefore, the data rate of a device that uses the MIMO system increases as many times as there are antennas in the MIMO system. In this regard, when data is transmitted / received using a channel bonding technique or MIMO, its supporting stations can read the transmitted / received data, but not the supporting stations, i.e. outdated stations cannot read transmitted / received data. Physical control of the carrier enables the physical layer to inform the MAC layer of whether the channel is busy or free by detecting whether the physical layer has received a predetermined receive power level. Thus, the physical control of the carrier is associated with the interpretation of the transmitted and received data.

If the transmitting device’s HT STA 101 transmits HT data, the receiving device’s HT STA 102 receives the HT data and transmits an HT acknowledgment (ACK) of the transmitting device ST ST 101 in response to the received HT data. Optional HT STA 103 can interpret HT data and HT ACK. During the period during which the HT data and HT ACK are transmitted and received equal to the network reservation vector (NAV), the medium is considered busy. Then, an additional HT STA 103 waits for DIFS after the NAV time period has elapsed, after which it randomly defers transmission and finally transmits the data.

Meanwhile, legacy station 201 is a station that complies with IEEE 802.11a, 802.11b, or 802.11g, but is unable to interpret HT data. Thus, after the HT ACK period is verified by physical carrier monitoring, the legacy station 201 waits for the EIFS period and then performs a transmission deferral. Thus, the obsolete station 201 waits longer than other stations, i.e. The HT STA 101 of the transmitting device, the HT STA 102 of the receiving device and the additional HT STA 103 before the backup of the medium, thereby adversely affecting the efficiency of data transfer.

IEEE 802.11 specifies that an active control frame, such as an ACK, a transmit ready frame (RTS), or a receive ready frame (CTS), is transmitted at the same transmission rate as the frame immediately preceding it. However, if the active control frame cannot be transmitted at the same transmission rate as the frame immediately preceding it, it must be transmitted at the highest speed in the basic service set (BSS) as defined in IEEE 802.11. In addition, unlike the legacy data format, HT data has additional HT preamble and HT signal fields, which increases the transmission of PPDU overhead, which can lead to an ACK frame that degrades performance compared to the legacy PPDU format. Those. the legacy PPDU of the IEEE 802.11a standard is approximately 20 μs, while the length of the new HT PPDU is approximately 40 μs or more.

Therefore, there is a need to improve network performance by transmitting legacy format data, for example, an ACK frame, without an HT preamble, when an outdated station cannot interpret data transmitted from an HT station, which may disrupt the correctness of virtual carrier monitoring.

Description of drawings

Figure 1 is a schematic representation of the PPDU format of the prior art specified by the IEEE 802.11 protocol.

FIG. 2 is a diagram illustrating that an outdated station with a low data rate does not allow virtual carrier monitoring when a plurality of stations having different transmission capabilities are shared in a network.

3 is a diagram illustrating a method of transmitting an active frame by applying an outdated method according to an exemplary embodiment of the present invention.

4 is a diagram illustrating PPDU data structures transmitted and received by an HT station.

5 is a diagram illustrating a procedure in which a receiving device transmits an inherited active frame when the transmitting device transmits HT data using channel binding, according to an exemplary embodiment of the present invention.

6 is a diagram illustrating a procedure in which a receiving device transmits an inherited active frame when the transmitting device transmits HT data using channel binding, according to another exemplary embodiment of the present invention.

7 is a diagram showing a procedure in which a receiving device transmits an inherited active frame when the transmitting device transmits HT data without using channel binding.

FIG. 8 is a diagram illustrating a legacy format HT data station according to an embodiment of the present invention.

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

Technical challenge

The present invention provides a method and apparatus for enabling an outdated station to perform virtual carrier monitoring when multiple stations with heterogeneous capabilities are shared in a wireless network.

The present invention also provides a method and apparatus for transmitting and receiving legacy format data in a high bandwidth wireless network.

The above objectives, as well as other objectives, features and advantages of the present invention should become apparent to specialists in this field of technology after reading the following description.

Technical solution

The present invention relates to a wireless network and, more specifically, to methods and devices for transmitting and receiving legacy data in a high bandwidth wireless network.

According to an aspect of the present invention, there is provided a method for transmitting legacy format data in a high throughput (HT) wireless network, the method comprising the steps of accessing the wireless network, receiving first data compatible with the first protocol, the first data being transmitted first the station that accessed the wireless network and transmit second data compatible with the second protocol to the first station, while the first protocol is backward compatible with the second protocol.

According to another aspect of the present invention, there is provided a method for receiving legacy format data in a high throughput (HT) wireless network, the method comprising the steps of accessing the wireless network, transmitting first data compatible with the first protocol to the first station connected with a wireless network, and receive second data compatible with the second protocol from the first station, while the first station is backward compatible with the second protocol.

According to yet another aspect of the present invention, there is provided a device for transmitting and receiving legacy format data in a high bandwidth (HT) wireless network, the device comprising a transmitting device that transmits first data compatible with the first protocol or second data compatible with a second protocol, a wireless network, wherein the first station is backward compatible with the second protocol, a receiver that receives data from the wireless network, and a control module evshey transmission, which controls the transmitting unit to transmit the second data in accordance with a second protocol.

According to a further aspect of the invention, there is provided a method for transmitting data in a wireless network, the method comprising the steps of accessing the wireless network, receiving the first data according to channel linking, wherein the first data is transmitted from the first station connected to the wireless network, and transmit an acknowledgment frame (ACK) by each of the channels used for linking the channels.

According to another aspect of the present invention, there is provided a wireless network device comprising a receiver that accesses a wireless network and receives first data according to channel linking, wherein the first data is transmitted from a first station connected to a wireless network and a transmitting device that transmits an acknowledgment frame (ACK) by each of the channels associated with channel binding.

The implementation of the invention

The present invention and its embodiments will be better understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings.

However, the present invention can be practiced in many other forms and should not be construed as limited by the exemplary embodiments set forth herein. Instead, these exemplary embodiments are provided so that the spirit of the invention is exhaustive and complete and fully expresses the idea of the invention to those skilled in the art, and the scope of the invention is fully defined by the appended claims. Similar reference numerals mean similar elements throughout the description.

The following describes a method and apparatus for transmitting and receiving legacy format data in an HT wireless network with reference to illustrations of flowcharts of methods according to exemplary embodiments of the invention. It should be understood that each step of the illustrations of the flowcharts of the flowchart of the method and the combination of the steps of the illustrations of flowcharts of the flowchart of the method can be implemented by computational software instructions. These computational program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing device to generate a machine so that instructions executed by a computer processor or other programmable data processing device provide an implementation tool the functions indicated in the step or steps of the flowchart of the method. These computational program instructions can also be stored in a computer-useable or machine-readable memory that can control a computer or other programmable data processing device to function in a similar way so that instructions stored in a computer-useable or machine-readable memory generate a production product containing means instruction, which implements the function indicated in the step or steps of the flowchart. Computational program instructions can also be downloaded to a computer or other programmable data processing device to instruct the sequence of operational steps to be executed on a computer or other programmable device to generate a computer-implemented process so that instructions that are executed on a computer or another programmable device, provided the steps for implementing the functions specified in the step or steps of the flowchart method operations.

Each step of the illustrations of the flowchart of the method may represent a module, segment or part of the code that contain one or more executable instructions for implementing these logical functions. It should also be noted that in some alternative implementations, the functions indicated in the steps may be performed in a different sequence. For example, two steps shown one after another can actually be executed almost simultaneously, or the steps can sometimes be executed in reverse order, depending on the functionality included.

HT wireless networks according to exemplary embodiments of the present invention include wireless networks capable of transmitting and receiving HT data, for example, an HT wireless network compatible with IEEE 802.11n protocol, a wireless network having compatibility with one of the IEEE 802.11a standards, Legacy 802.11b and 802.11g, etc.

3 is a diagram illustrating a method of transmitting an active frame by applying an outdated method according to an exemplary embodiment of the present invention. HT stations 101, 102, and 103 and legacy station 201 are shared on a wireless network. In operation S10, the HT station 101 of the transmitting device transmits HT data to the HT station 102 of the receiving device. As described above, HT data means data transmitted at high speed using a channel bonding technique or MIMO. HT (high throughput) stations include stations using a protocol that enables high-speed data transmission, for example, stations compatible with IEEE 802.11n. Since the receiving station HT station 102 and the additional HT station 103 can interpret the HT data, they perform virtual carrier monitoring. However, since the legacy station 201 does not allow interpretation of HT data, it cannot perform virtual carrier monitoring. Instead, the outdated station determines that the medium is currently busy, thereby physically monitoring the carrier. After completion of the transmission of the HT data, operation S11 begins, and a delay in the transmission may be performed after waiting for the EIFS period.

If the HT station 101 of the transmitting device completes the transmission of HT data, the procedure proceeds to step S11. At this time, the receiving station HT station 102 transmits the legacy active frame after the SIFS period has elapsed. A legacy active frame is an ACK frame generated according to the 802.11a, 802.11b, or 802.11g protocol. The legacy active frame can be transmitted and received from both the legacy station and the HT station. After receiving each inherited active frame, each of the HT stations 101, 102, 103 interprets the inherited active frame, and when the inherited active frame is completed, the HT stations 101, 102 and 103 proceed to step S12 and carry out a transmission delay procedure after the DIFS period has elapsed.

In addition, since the legacy station allows interpretation of the legacy, but does not allow the interpretation of HT data, it is allowed to wait for the DIFS in step S12 to prohibit the legacy station 201 from performing a delayed transmission procedure. Therefore, the outdated station 201 has the ability to participate in the procedure for deferring transmission in the same way as the HT stations 101, 102 and 103, thereby avoiding performance degradation.

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.

An HT station provides the ability to send and receive data in two ways. Because the two paths begin with legacy preambles, the two paths are structured to be interpreted by obsolete stations.

The legacy format PPDU (PLCP protocol data module) (30) includes L-STF (legacy short training field), L-LTF (legacy long training field) and L-SIG (legacy signal field), as well as DATA operational data. Similar to FIG. 1, the L-SIG includes data rate, reserved bits, length, parity, and tail bits. The legacy PPDU has DATA operational data after L-STF, L-LTF, L-SIG. L-STF, L-LTF, L-SIG contain information regarding the regulation of power, signal, etc., respectively. Inherited data follows the obsolete preamble. Thus, the legacy preamble 30 can be interpreted by both the HT station and the legacy station.

When the PPDU 40 has an HT preamble added to the inherited preamble, the HT station considers the PPDU 40 as HT data. The HT preamble contains information regarding HT data. The HT preamble consists of HT-SIG, HT-STF and HT-LTF. The HT-SIG consists of several fields, including the length of the HT data (Length), MCS information defining a coding and modulation scheme (MSC), bits indicating the presence of improved coding, a sounding packet indicating whether transmission has been completed on all antennas (Sounding Packet), the number of HT-LTFs in the transmitted PPDU (Number Of HT-LTF), a short GI that indicates whether a short guard interval is applied to the frame data area (Short GI), the initial value of the scrambler (ScramblerINIT), information indicating the PPDU is converted to a signal with a bandwidth of 20 or 40 MHz (20/40 BW), and the CRC field for error checking. The HT data follows the HT-SIG containing the above information, the HT-STF and HT-LTF as much as the HT-LTF indicated in the HT-SIG.

As shown in FIG. 4, if short data is transmitted to the HT PPDU 40, a substantial extension of the HT preamble is triggered, thereby significantly increasing overhead transmission. Thus, in order to transmit frames including only short data, for example, control frames, it is efficient to use the legacy PPDU 30. In addition, the legacy PPDU 30 enables the legacy station to carry out virtual carrier monitoring when the legacy station is used in a wireless network.

5 is a diagram illustrating a procedure in which a receiving device transmits an inherited active frame when the transmitting device transmits HT data using channel binding, according to an exemplary embodiment of the present invention. When the transmitting device selects two adjacent channels with the current channel, i.e. the current channel and the channel immediately following it and the immediately preceding channel and the current channel, connected to each other, and transmits this to the receiver, the receiver receives this and transmits the inherited active frame to each channel. 5 shows an example in which each antenna does not allow processing of different channels. The receiving station's HT station uses an overlap mode in which data containing an inherited active frame 30 overlaps from a lower subchannel to an upper subchannel via a single antenna 181.

In this case, the legacy active frame 30 may be transmitted by the upper and lower subchannels. In addition, the legacy active frame 30 may be received by HT stations and legacy stations used in the upper and lower subchannels. The PPDU including the legacy active frame consists of L-STF (legacy short training field), L-LTF (legacy long training field), L-SIG (legacy signal field) and DATA operational data (legacy data), as described above with reference to FIG. 4.

6 is a diagram showing a procedure in which a receiving device transmits an inherited active frame when the transmitting device transmits HT data using channel linking, according to another exemplary embodiment of the present invention, in which antennas 181 and 182 transmit data to different channels, in contrast to figure 5. When the transmitting device selects two adjacent channels with the current channel, i.e. the current channel and the channel immediately following it and the immediately preceding channel and the current channel, connected to each other, and transmits this to the receiver, the receiver receives this and transmits the inherited active frame to each channel. In contrast to FIG. 5, respective antennas 181 and 182 are capable of processing various channels. The receiving device accesses the upper and lower subchannels using the respective antennas 181 and 182 and transmits the same inherited active frame 300. The frame structure of the legacy format is identical to that described in FIG. 4.

The legacy format data is simultaneously transmitted to the control channel and the extension channel in response to a frame transmitted by linking the channels, as shown in FIGS. 5 and 6, which allows legacy format data to be received by stations also in the expansion channel.

7 is a diagram illustrating a procedure in which an HT station of a receiving device transmits an inherited active frame when an HT station of a transmitting device transmits HT data without using channel binding, according to an exemplary embodiment of the present invention. When the HT station of the transmitting device transmits HT data using the MIMO technique, the HT station of the receiving device uses one antenna 181 in order to transmit the legacy active frame via the current channel. The HT station of the transmitting device accepts the legacy active frame received by the current channel. Other HT stations may interpret the legacy active frame to provide virtual carrier control. Additionally, legacy stations exchanging data via the current channel may also interpret the legacy active frame. The frame structure of the legacy format is identical to that described in FIG.

As illustrated in FIGS. 5-7, the receiving station HT transmits the inherited PPDUs in various ways according to the transmission method used by the transmitting device HT station. The HT station of the receiver can be informed about the transmission method used by the HT station of the transmitter from the MCS values in the HT-SIG HT PPDU field shown in FIG. 4. Those. the number of antennas used in data transmission, or the number of spatial streams used, modulation schemes, coding rate, guard interval and the use or not use of channel bonding (40 MHz mode) can be inferred from the MCS values shown in the table. The table illustrates a table of exemplary modulation and coding schemes (MCS).

Mcs Number of threads Modulation schemes Coding rate G1 = 800 ns G1 = 400 ns 20 MHz 40 MHz 20 MHz 40 MHz 0 one Bpsk 1/2 6.50 13.50 7.22 15.00 one one QPSK 1/2 13.00 27.00 14.44 30.00 2 one QPSK 3/4 19.50 40.50 21.67 45.00 3 one 16-qam 1/2 26.00 54.00 28.89 60.00 four one 16-qam 3/4 39.00 81.00 43.33 90.00 5 one 64-qam 2/3 52.00 108.00 57.78 120.00 6 one 64-qam 3/4 58.50 121.50 65.00 135.00 7 one 64-qam 5/6 65.00 135.00 72.22 150.00 8 2 Bpsk 1/2 13.00 27.00 14.44 30.00 9 2 QPSK 1/2 26.00 54.00 28.89 60.00 10 2 QPSK 3/4 39.00 81.00 43.33 90.00 eleven 2 16-qam 1/2 52.00 108.00 57.78 120.00 12 2 16-qam 3/4 78.00 162.00 86.67 180.00 13 2 64-qam 2/3 104.52 216.00 116.13 240.00 fourteen 2 64-qam 3/4 117.00 243.00 130.00 270.00 fifteen 2 64-qam 5/6 130.00 270.00 144.44 300.00 16 3 Bpsk 1/2 19.50 40.50 21.67 45.00

An HT station can transmit not only an active frame, but also a PPDU of a control frame that includes short data, such as a CTS frame (receive ready) or RTS (transmit ready). During the transmission of the legacy format, the legacy station may perform virtual carrier monitoring. When transmitting a legacy format, it is not necessary to add an HT preamble to the data. Therefore, overhead transmission can be reduced when a small amount of data is transmitted. In case of a significant amount of data, the PPDU of the HT format is transmitted. In the case of short data, i.e. a small amount of data, for example, a control frame, is transmitted by the PPDU of the legacy format, thereby reducing the total amount of data transmitted and received throughout the wireless network, and implementing a wireless network in which the HT station and the legacy station are shared.

The term “module” as used herein means, but is not limited to, a software or hardware component or module, such as a user-programmable matrix LSI (FPGA) or application-specific integrated circuit (ASIC), which performs certain tasks. The module may advantageously be configured to be stored on an addressable storage medium, and configured to run on one or more processors. Thus, a module can include components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, auxiliary procedures, program code segments, drivers, firmware, microcodes, circuits , data, databases, data structures, tables, arrays and parameters. The functionality provided in the components and modules can be combined in fewer components and modules or further divided in additional components and modules. In addition, components and modules can be implemented in such a way that they are executed in one or more CPUs in a communication system.

FIG. 8 is a diagram illustrating an HT station that transmits legacy format data according to an embodiment of the present invention. The HT station 100 includes a transmitter 110, a receiver 120, an encoding module 130, a decoding module 140, a control module 150, a legacy transmission control module 160, and two antennas 181 and 182. Antennas 181 and 182 receive and transmit wireless signals.

Transmitter 110 transmits signals to antennas 181 and 182, and encoding module 130 encodes data to generate signals to be transmitted to antennas 181 and 182 by transmitter 110. In order to transmit signals via two or more antennas using the MIMO technique, the data must be split and then encoded separately. Alternatively, in order to transmit signals using channel bonding, the transmitter 110 selects two adjacent channels, including the current channel and the channel immediately following it, or the immediately preceding channel, which should be connected to each other, and transmits signals via connected channels.

A receiver 120 receives signals from antennas 181 and 182, and a decoding module 140 decodes signals received by a receiver 120 into data. When data is received using the MIMO technique, it is necessary to integrate the data transmitted through the two channels.

The legacy transmission control module 160 monitors short-length data, for example, an active frame (ACK), a CTS frame, or an RTS frame to be transmitted in a legacy format. The control unit 150 controls and monitors the exchange of information between various elements of the HT station 100.

9 is a flowchart illustrating a procedure in which an HT station receives an HT frame and transmits a legacy frame as an active frame, according to an exemplary embodiment of the present invention.

The HT station accesses the wireless network in step S301. In this case, accessing a wireless network includes not only accessing an existing wireless network, but also new generation of a wireless network. In one exemplary embodiment, step S301 may include generating a basic set of services (BSS), for example, access point (AP) operations. Then, the first station used in the wireless network receives data compatible with the first protocol in step S302. The first protocol includes protocols that enable high-speed transmission and reception of data, for example, the IEEE 802.11n protocol. In addition, the term “first protocol” may include protocols having backward compatibility with legacy format protocols.

The term "backward compatibility" as used herein means that the upgraded protocol or software is compatible with previously proposed protocols or software. For example, the IEEE 802.11n protocols can interpret data that is transmitted and received in the IEEE 802.11a, IEEE 802.11b, or IEEE 802.11g protocol, and can transmit / receive HT data as interpreted. The same applies when upgraded software is available to enable the data generated from the current software to be interpreted or managed.

After receiving the data, it is determined whether the first data is transmitted by channel linking in step S310. If the first data is transmitted by channel bonding, the second data compatible with the second protocol is transmitted by the corresponding channels used in the channel bonding in step S320. According to the second protocol, frames are transmitted that can be interpreted by legacy stations receiving channels associated with channel binding. Thus, if the first protocol is compatible with IEEE 802.11n, the second protocol includes protocols with which the IEEE 802.11n protocol is backward compatible, for example, IEEE 802.11a, 802.11b, 802.11g, and the like. Transfer procedures are described above with reference to FIG.

If the first data is transmitted without linking channels (NO in step S310), i.e. if the first data is transmitted using, for example, a MIMO technique, the second data compatible with the second protocol is transmitted in step S330. The transfer procedure is described above with reference to Fig.6. As described above, the second protocol includes a protocol with which the first protocol is backward compatible.

The wireless network shown in FIG. 9 may be a BSS with an AP, or an independent basic service set (IBSS) without an AP. The second data is short data including control frames such as ACK, CTS, RTS, etc.

The second data may be interpreted by legacy stations so that legacy stations can perform virtual carrier monitoring. Therefore, the use of second data improves transmission efficiency in a wireless network without obsolete stations.

Those skilled in the art should understand that various changes in form and detail can be made without departing from the spirit and scope of the present invention as defined by the appended claims. Therefore, it should be appreciated that the above exemplary embodiments are for illustration only and should not be construed as limiting the invention. The scope of the invention is defined by the appended claims, and not by the foregoing description, and variations and equivalents that fall within the scope of the claims are intended to be embraced therein.

Industrial applicability

As described above, according to exemplary embodiments of the present invention, when HT stations and legacy stations, each of which has different transmission capabilities, are shared in a wireless network, legacy stations can perform virtual carrier monitoring.

In addition, according to exemplary embodiments of the present invention, short data is transmitted in a legacy format, thereby increasing transmission efficiency.

Claims (8)

1. A method for transmitting / receiving data in a wireless network, comprising the steps of: transmitting from a station with a high bandwidth the first data on a connecting channel, which is formed by a channel connecting the first and second neighboring channels, and receiving at the station with a high bandwidth data with a legacy format for each of: the first and second adjacent channels; wherein the second data is an inherited acknowledgment frame (ACK) in response to the first data. 2. The method of claim 1, wherein the wireless network is compatible with the IEEE 802.11n standard. 3. The method according to claim 1, wherein the legacy format is compatible with the IEEE 802.11a standard, the IEEE 802.11b standard, and the IEEE 802.11g standard. 4. The method according to claim 1, in which the first and second data is transmitted simultaneously and separately. 5. A wireless network device in a wireless network, comprising: a transmitting device that transmits first data on a communication channel that is formed by a channel connecting the first and second adjacent channels, and a receiving device that receives second data with an inherited format for each of: the first and the second adjacent channels, wherein the second data is an inherited acknowledgment frame (ACK) in response to the first data, wherein the wireless network device is a high throughput station lities. 6. The device according to claim 5, in which the wireless network is compatible with the IEEE 802.11n standard. 7. The device according to claim 5, in which the legacy format is compatible with the IEEE 802.11a standard, the IEEE 802.11b standard, and the IEEE 802.11g standard. 8. The device according to claim 5, in which the first and second data are transmitted simultaneously and separately.

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