KR20070027018A - Wireless communication apparatus and national communication protocol auto-sellecting method using thereof - Google Patents

Abstract

A wireless communication device and a wireless communication method using the device are provided to perform wireless communication by using a wireless LAN(Local Area Network) card which sets/stores all of different communication standards corresponding to each country, without comprising separate wireless LAN cards for each country, thus a user can automatically use a wireless communication service in a corresponding country without purchasing a separate wireless LAN card. A packet signal is received to a wireless communication device from a wireless access device or a different wireless communication device(S501). The wireless communication device obtains an automatic country selection signal from the packet signal(S502-S507). The wireless communication device automatically obtains wireless communication information on a corresponding country, which is included in the packet signal(S508). The wireless communication device sets a wireless communication standard by using the obtained wireless communication information(S509). The wireless communication device performs wireless communication by wirelessly accessing through the set wireless communication standard(S510).

Description

Wireless communication apparatus and automatic selection method of national communication standard using same {Wireless communication apparatus and national communication protocol Auto-sellecting method using

1 is a block diagram showing a wireless communication system using a general wireless communication device.

2 is an exemplary diagram for explaining a structure of a PPDU frame format used in a conventional wireless communication device.

3 illustrates the structure of a PPDU frame format used in accordance with the present invention.

4 is a diagram showing a structure of a frame control region of a header portion of a MAC frame according to the present invention.

5 is a flowchart illustrating a method for automatically selecting a communication standard of a corresponding country using a PPDU used according to the present invention.

* Explanation of symbols for main parts of drawings *

10: WLAN card 11: wireless transceiver

12: baseband processing unit 13: MAC processing unit

14: storage unit 20: AP (Access Point)

30: wireless communication terminal

The present invention relates to a method for automatically selecting a communication standard for each country in a wireless communication device, and more particularly, to a method for automatically selecting and using a communication standard defined differently for each country stored in a wireless communication device. It is about.

In general, a wireless local area network (WLAN) of wireless communication devices is a wireless LAN that transmits and receives data between a computer and a computer or other communication devices using a radio frequency (RF) or infrared ray. it means. This wireless LAN has been developed recently due to the rapid development of Internet service and wireless communication technology. Especially, it is easy to install and maintain in places where wired networks are not easy to build, such as network access in buildings, large offices and exhibition halls. Its use is exploding due to its simplicity.

The wireless LAN card installed in the wireless LAN system is an interface card for transmitting and receiving data between a plurality of computers connected to an allocated network. The wireless LAN card transmits baseband signals through radio waves because it uses radio waves or infrared rays to transmit and receive data wirelessly. There is a need for a physical layer.

On the other hand, among the standards of the physical layer of the WLAN, for example, 802.11 was developed by the IEEE working group, and currently divided into four standards such as 802.11, 802.11a, 802.11b, and 802.11g, and all four standards are Ethernet for sharing a path. The protocol uses CSMA / CA. The 802.11b specification uses Complementary Code Keying (CCK) modulation, which provides faster data rates than 802.11 using PSK modulation, and is less susceptible to interference from multipath propagation, and operates in the 2.4 GHz band. It provides a transfer rate of 11Mbps per second. The 802.11a specification, developed from 802.11b, is applied to wireless atm systems, operates at radio frequency bandwidths of 5 GHz to 6 GHz, and can achieve data rates up to 54 Mbps using orthogonal frequency-division multiplexing (OFDM) modulation. have.

In addition, the contents adopted by each country among the frequency bands of the WLAN card recommended by IEEE 802.11 are shown in Table 1 below.

channel Center frequency USA / Canada Europe France Spain Republic of Korea One 2412 MHz ○ ○ ○ 2 2417 MHz ○ ○ ○ 3 2422 MHz ○ ○ ○ 4 2427 MHz ○ ○ ○ 5 2432 MHz ○ ○ ○ 6 2437 MHz ○ ○ ○ 7 2442 MHz ○ ○ ○ 8 2447 MHz ○ ○ ○ 9 2452 MHz ○ ○ ○ 10 2457 MHz ○ ○ ○ ○ ○ 11 2462 MHz ○ ○ ○ ○ ○ 12 2467 MHz ○ ○ ○ 13 2472 MHz ○ ○ ○ 14 2484 MHz

As shown in Table 1, the United States and Canada use the center frequencies of 2412 MHz to 2462 MHz bands, while in Europe and Korea they use most of the recommended frequency bands from 2412 MHz to 2462 MHz bands. Only the band 2457 MHz to 2472 MHz and Spain use only the band 2457 MHz to 2462 MHz.

Firmware for driving a hardware-configured WLAN card using these frequencies includes initial firmware for downloading the driver firmware to an empty flash memory during initial installation, and a firmware for initializing and updating the WLAN card. Head firmware, secondary firmware that implements a communication protocol for wireless LAN, and a PDA (Productiuon Data Area) that stores the characteristics of the wireless LAN card, which is associated with the frequency band settings allowed for use in Table 1. Information and the like are recorded.

In the related art, since the frequency bands allowed by the WLAN card are different in each country, as described above, the PDA is changed and the firmware downloaded to the WLAN card is changed according to the above, and the WLAN card is produced, managed, and sold by country. .

In addition, a wireless LAN card is connected to an access point (AP), which is a wireless access device interworking with a wired network, to be allocated a communication channel, and the AP is an ISM (Indutrial, Scientific and Medical) band region of a 2.4 GHz frequency band without a license. It can be used to configure a network of speeds of several Mbps to several tens of Mbps.

The AP follows the high-speed 802.11 standard of Direct Sequence Spread Spectrum (DSSS), because the existing AP supporting 2Mbps speed and the latest AP supporting 11Mbps speed coexist and move easily to high speed 11Mbps environment. This is because there is compatibility between different products.

In order to maximize the transmission / reception distance of the communication module provided in the wireless LAN equipment, the output of the transmission frequency should also be kept to the maximum.

For the reasons mentioned above, the frequency amplifier is limited in maximizing its output, and as the output of the frequency amplifier rises, the ACPR value also increases, so the aspect of this ACPR must be taken into account to realize the maximum output of the frequency amplifier.

Therefore, as described above, producers and sellers have a problem of separately producing, managing, and selling wireless LAN cards for each country, and users have inconvenience to purchase and install wireless LAN cards for each country.

An object of the present invention is to provide a method for automatically selecting a country-specific communication standard in a wireless communication device so that a communication standard different from country to country can be automatically selected and used.

Another object of the present invention is to solve the inconvenience of separately purchasing and installing a wireless communication device for each country to facilitate user convenience.

In order to achieve the above object, the present invention provides a method for wirelessly communicating by selecting and executing different communication standard information for each country using a wireless communication device, wherein a packet is transmitted from a wireless access device or a different wireless communication device to the wireless communication device. A packet signal receiving step of receiving a signal; The wireless communication device obtaining a country auto selection signal from the packet signal; Acquiring, by the wireless communication device, the wireless communication information of the corresponding country automatically included in the packet signal when the automatic country selection signal is acquired; A wireless communication setting step of setting a wireless communication standard of the wireless communication device by using the obtained country wireless communication information; And a wireless communication performing step of performing wireless communication by wirelessly connecting to the set wireless communication standard.

In another aspect, the present invention provides a wireless transmission and reception unit for receiving a radio signal from an access point (AP) or a wireless communication terminal and transmitting and receiving data transmitted to the AP or the wireless communication terminal as a radio signal; A baseband processor for demodulating data received through the wireless transceiver and modulating data transmitted to the AP through the wireless transceiver; A MAC processor for performing data link processing by the AP and a medium access control (MAC) protocol; And a storage unit connected to the MAC processing unit to store country-specific addresses, country-specific radio communication standard information, and characteristics of the radio communication device, to automatically select radio communication standard information different from country to country and execute wireless communication. It relates to a wireless communication device.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram illustrating a wireless communication system using a general wireless communication device.

As shown in FIG. 1, a general wireless communication device, for example, a wireless LAN card 10 receives and processes a wireless signal from an access point (AP) 20 or a wireless communication terminal 30 and performs a corresponding mobile communication terminal. A wireless transceiver 11 for transmitting and receiving data transmitted from the AP 20 to the AP 20 as a radio signal, demodulating data received through the wireless transceiver 11, and the AP 20 through the wireless transceiver 11. MAC processing unit for performing data link processing, such as channel secured by the MAC (Medium Access Control) protocol between the AP 20 and the mobile communication terminal for modulating data transmitted to the base station; And a storage unit such as an electronically erasable programmable read only memory (EEPROM) connected to the MAC processing unit 13 to store country-specific addresses, country-specific communication standard information, PDA data storing characteristics of a wireless LAN card, and the like. Consisting of 14 .

When the wireless LAN card 10 having such a configuration is installed in a new mobile communication terminal, the wireless LAN card scans all channels to receive a beacon transmitted from the AP 20, and to the frame of the received beacon signal. By reading the loaded information, a channel set for each AP 20 should be set as a data communication channel according to the read information.

In general, a plurality of APs set to different channels transmit a beacon signal, and after receiving the WLAN card 10, the WLAN card 10 does not need an AP to support communication between wireless clients (AD-hoc). Communication in one mode, and the infrastructure mode that supports network formation by accessing a wired network using an AP. At this time, in infrastructure construction mode, it communicates with AP and checks the channel set in AP by network manager. In Ed-Hock mode, user selects one channel among the allowed channels for each country and uses it for wireless communication. Done.

The embodiment of the present invention in such a wireless communication method will be described taking the wireless communication standard of the high-speed wireless LAN IEEE 802.11a of the OFDM method using the 5 GHz band as an example.

The physical layer structure of OFDM using the 5 GHz band is composed of three blocks, specifically, Physical Layer Convergence Procedure (PLCP), Physical Medium Dependent (PMD), Physical Layer Management Entity (PLME), and the like. Defined to have a minimum association with the PMD. In other words, the PLCP converts a service generated from the IEEE 802.11 MAC into an OFDM physical layer or a signal from the OFDM physical layer into a signal suitable for the service of the IEEE 802.11 MAC. The IEEE 802.11 MAC is associated with the OFDM physical layer. It is a block that enables to operate independently without using.

A description will be given by taking an example of a PPDU (PLCP protocol data unit) frame format transmitted using the OFDM scheme using the 5 GHz band.

FIG. 2 is an exemplary diagram for describing a structure of a PPDU frame format used in a general wireless communication device, and shows a frame structure of a PPDU of IEEE 802.11a.

PPDU frame is divided into three parts, PLCP preamble, SIGNAL, DATA, double PLCP preamble is used for signal detection, time and frequency synchronization, channel estimation, and SIGNAL contains information about transmission. Data is mainly transmitted by PHY sublayer service data units (PSDU).

The PLCP preamble portion is a signal region for synchronization and channel estimation of the OFDM physical layer. The PLCP preamble consists of 10 short training signals and 2 long training signals. The 10 short training signals are used for signal detection, AGC, diversity selection, fine time synchronization and integer frequency error estimation. Two training signals are used for channel estimation and prime frequency error estimation. In the IEEE 802.11a wireless communication standard, synchronization and channel estimation are performed using a PLCP preamble.

The SIGNAL portion includes a 1-bit reserved area, a 1-bit parity area, and a 6-bit tail area around a RATE area indicating a transmission rate and a LENGTH area indicating a length of the PPDU. This SIGNAL part is encoded using a coding rate of 1/2 and transmitted over BPSK.

The DATA part consists of PSDU area, SERVICE area, TAIL area, and PAD bit area. The TAIL area is used to make convolutional coding initial. The PAD bit area is an area for bits that are added to be integer multiples if the total data bits are not integer multiples of the encoded bits of one OFDM symbol. to be. Here, all bits in the DATA portion are scrambled, convolutionally encoded according to the transmission rate of the RATE region defined in the SIGNAL portion, and are interleaved and transmitted through the modulation scheme defined in the RATE region through interleaving.

In the PPDU frame format having the above configuration, the present invention defines a reserved area of the SIGNAL part as a country area, and automatically recognizes a frame control area of the MAC frame by using the same, thereby selecting a communication standard for each country to perform wireless communication. do.

3 is a diagram illustrating a structure of a PPDU frame format used according to the present invention, in which a reserved area of a conventional SIGNAL portion is defined as a country area and is automatically MAC when the country area has, for example, a bit value of 1; Recognize the frame control region of a frame.

4 is a diagram illustrating the structure of a frame control region of a header portion of a MAC frame according to the present invention, in which a MAC frame and a frame of the header portion are automatically recognized by a country region having a bit value of 1; The control area is shown.

As shown in Fig. 4, the frame control region includes a protocol version region, a type region, a subtype region, a to DS region for a called party distribution system, and a from DS region for a caller distribution system. And a More Frag area for a continuous Frag, a Retry area for a connection retry, a Pwr Mgt area for power management, a More Data area for a continuous data, a WEP area, and an Order area.

In the frame control region having such a configuration, the present invention uses a type region and a subtype region.

According to the present invention, if the value of the type region using B2 to B3 bits is 11, the subtype region may be used as a reserved region, and as shown in [Table 2], the subtype region may be 0000 to 1111. It has a predetermined bit value.

In accordance with this bit value, wireless communication is set by downloading data relating to a communication standard for each country stored in the storage unit 34 of the wireless LAN card shown in FIG. 1, specifically, the EEPROM. Here, as shown in [Table 3], the EEPROM has a bit value of 4 bits equal to the bit value described in the subtype area of the frame control area, and corresponds to the country corresponding to the bit value of each subtype area. It stores communication standard information.

Specifically, when the subtype region of the frame control region has a bit value of "0000", a controller (not shown) of a wireless communication device such as a mobile communication terminal grasps that the bit value of "0000" corresponds to the United States. And automatically transmits the combined request signal to the EEPROM, corresponding to the US communication standard corresponding to the "0000" bit value stored in the first byte of the EEPROM, for example, 11 channels of wireless communication and 21 dBm maximum frequency output. Download data such as information.

Based on the data about the American communication standard downloaded as above, the control unit of the wireless communication device sets the wireless communication channel and the wireless communication frequency output and performs a wireless communication connection.

Hereinafter, a method of automatically selecting a country-specific communication standard in a wireless communication device according to the present invention will be described.

5 is a flowchart illustrating a method for automatically selecting a communication standard of a corresponding country using a PPDU used according to the present invention. Herein, in order to apply the present invention, not only a wireless communication device but also an AP, a network information center (NIC), and the like, which are involved in wireless communication, will be described on the premise that wireless communication is performed using the PPDU shown in FIG. 3.

First, in the case where a wireless communication device such as a wireless LAN card is to be used to execute wireless communication in a certain country, the wireless communication device from an existing AP or any wireless communication terminal (hereinafter, referred to as an opposite station) in any country (Defined as a user side station), a predetermined packet signal, for example, a signal including the PPDU shown in FIG. 3 is received (S501).

After receiving the predetermined signal, the user station recognizes the country area of the PLCP header portion of the PPDU frame included in the signal (S502).

In this case, it is determined whether the bit value of the country area recognized by the corresponding wireless communication device is 1 (S503), and if the bit value of the country area is not 1, the wireless communication device performs wireless communication only with the wireless communication standard of the country initially set in the user station. (S504).

In step S503, if the bit value of the country area is 1, the user station automatically recognizes the frame control area of the MAC frame included in the PPDU (S505).

After automatically recognizing the frame control area of the MAC frame, the user station reads the bit value of the sub type area of the frame control area configured in the MAC frame (S506). This is because the type region configured in the MAC frame has a predetermined bit value, for example, a bit value of 11, and thus the subtype region can be used as a reserved region.

After reading the bit value of the sub type region, the user side station reads the bit value of the storage unit 14 such as the EEPROM of the WLAN card 10 in correspondence with the read bit value (S507). Specifically, for example, if the bit value of the sub type area of the frame control area configured in the MAC frame is "0000", the user station may have a bit value of "0000" in the storage unit 14 of the WLAN card 10. Read it.

Thereafter, the user station downloads communication standard information corresponding to "0000" from the storage unit 14, for example, a maximum frequency output of 21 dBm, a corresponding channel of 11 ch, and the like as described in [Table 3] (S508). Here, the communication standard information may include the maximum frequency output described in [Table 3], the center frequency, IP, and the like, without being limited to the corresponding channel.

After the control unit of the user station has downloaded the communication standard information corresponding to "0000" from the storage unit 14, the wireless communication standard is set to the maximum frequency output of 21 dBm and the channel of 11 ch as described in the downloaded communication standard information ( S509).

After setting the wireless communication standard with the downloaded communication standard information, the user station performs a wireless communication with a maximum frequency output of 21 dBm by wireless connection to the channel of 11ch (S510).

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiments are for the purpose of description and not of limitation.

In addition, those skilled in the art will understand that various implementations are possible within the scope of the technical idea of the present invention.

As described above, the present invention does not need to provide a separate wireless LAN card for each country, so that wireless communication can be performed using a wireless LAN card that sets and stores all the different communication standards for each country. There is no need, and users can automatically use the wireless communication service in their country without purchasing a separate WLAN card.

Claims (8)

In the method for wireless communication by automatically selecting and executing the communication standard information for each country using a wireless communication device, A packet signal receiving step of receiving a packet signal from a wireless access device or a different wireless communication device to the wireless communication device; The wireless communication device obtaining a country auto selection signal from the packet signal; Acquiring, by the wireless communication device, the wireless communication information of the corresponding country automatically included in the packet signal when the automatic country selection signal is acquired; A wireless communication setting step of setting a wireless communication standard of the wireless communication device by using the obtained country wireless communication information; And And a wireless communication performing step of performing wireless communication by wirelessly connecting to the set wireless communication standard. The method of claim 1, The country automatic selection signal acquisition step A national area recognizing step of the wireless communication device recognizing a country area of a PPCP frame included in the packet signal; A country area determining step of determining whether a bit value of the country area is 1; And If the bit value of the country area is 1, the wireless communication device further comprises a control area automatic recognition step of automatically recognizing the frame control area of the MAC frame included in the PPDU Communication method. The method according to claim 1 or 2, The corresponding wireless communication information acquisition step A subtype region reading step of reading a bit value of a subtype region constituting a frame control region of a MAC frame from a PPDU frame included in the packet signal; A storage unit reading step of reading a storage unit corresponding to the bit value of the read sub type region; And a downloading step of downloading the wireless communication standard information corresponding to the read bit value of the sub type region by reading the storage unit. The method of claim 2, If the bit value of the country area is not 1, the wireless communication device performs wireless communication by wirelessly connecting to a wireless communication standard of a country set at the time of manufacture. The method of claim 3, wherein The storage unit is a wireless communication method using a wireless communication device, characterized in that EEPROM (electronically erasable programmable read only memory). A program comprising the process of a wireless communication method using a wireless communication device according to claim 1. A wireless transceiver for receiving and processing a radio signal from an access point (AP) or a wireless communication terminal and transmitting and transmitting data transmitted to the AP or the wireless communication terminal as a wireless signal; A baseband processor for demodulating data received through the wireless transceiver and modulating data transmitted to the AP through the wireless transceiver; A MAC processor for performing data link processing by the AP and a medium access control (MAC) protocol; And A storage unit connected to the MAC processor to store country-specific addresses, country-specific wireless communication standard information, and characteristics of a wireless communication device, A wireless communication device characterized by executing wireless communication by automatically selecting different wireless communication standard information for each country. The method of claim 7, wherein The radio signal is a wireless communication device, characterized in that the packet signal of the PPDU frame (PPDU) frame including the country.

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