KR100605369B1 - A Control process & Transceiver system for wireless communication network - Google Patents

Abstract

The present invention relates to a wireless data network access control method and a wireless data communication system to control the collision of channel signals in a sequential multiple access of a wireless communication network to improve the frequency utilization rate, improve the call connection rate, This technology aims at efficiency in communication network operation such as securing wide area mobility.

Description

Wireless data network access control method and wireless data transmission system {A Control process & Transceiver system for wireless communication network}

The present invention relates to a network access control method and a transmission system in the field of wireless data communication. In particular, the purpose of the present invention is to improve the efficiency of frequency utilization through the efficient traffic distribution of the wireless channel, and to ensure the mobility of the terminal and the stability of data transmission.

Wireless data communication is a field of mobile communication and fixed communication, which is remarkably developed with the development of digital communication technology, and is a technology that is advantageously used in mobile or remote areas where it is difficult to establish a fixed network.

Currently, commercially available wireless data communication systems include a multipoint to multipoint system utilizing a communication network of a mobile operator such as a mobile communication network and a private point to point system that communicates only with each other designated by a limited channel.

Wireless data communication using mobile communication network is unique to mobile communication network and can perform arbitrary communication between subscribers. However, in order to access exchange network, it is inconvenient to dial other party's number first. In case of no access area, dialing should be retried, so an interface device such as automatic call connection control function is required to link communication with central monitoring room automatically from unmanned remote device.

In wireless data communication using a mobile communication network, it is necessary to use a communication provider's facility to exchange with Multipoint. Therefore, the continuous generation of communication charges is a significant problem. In addition to the initial investment costs, such as telephone equipment costs and interface equipment costs, continuous telecommunications fees will be incurred.

Point-to-point communication method that communicates with the other party designated by the limited channel does not need dailling operation and can be simply established as a private network by using the narrow band of short-to-short-wave. Since the channel must be artificially selected, the operation becomes inconvenient when operating the terminal device in the mobile, and it is difficult to use it as a communication means of the unmanned remote device.

On the other hand, in order to make the most of the advantages of data communication, it is well known that the interconnection is automatically configured by attempting mechanical multiple access by connecting a few base stations and many terminal stations into one network.

Many techniques have been proposed as a link network method for this purpose, and a representative one of them is called individual calling (Polling / Answering or simply Polling) to call the terminal stations belonging to the main station (base station) one by one and ask whether data transmission is necessary. And free access (also known as Contention or Free Access), which attempt to access a host station competitively when data transmission is required, such as Carrier Sensed Multiple Access / Collision Avoidance (CSMA / CA).

CSMA / CA is an efficient method when the number of terminal stations is small, and Polling / Answering is known as a method that can efficiently communicate sequentially without collisions when there are a large number of terminal stations.

However, this method is only a wired network access technology such as a local area network (LAN). Therefore, in a wireless network that is applied as it is, when a traffic increases due to an increase in terminal stations, a data collision or a long link time may occur. The drawback is also that the Polling Signal itself places a load on the network even if the terminal station has no data to transmit.

This drawback increases the transmission delay of the wireless data network. As a result, the necessity of researching a new access technology to reinforce the provision of the wireless data network has emerged.

A first object of the present invention is to provide a network access control for efficiently managing a channel in a wireless data communication network to synchronize a channel of a base station and a terminal station, and a network access control means for efficiently transmitting data between communication partners. ,

A second object of the present invention is to provide a data relay means for efficiently transmitting remote data by organically linking a wireless network and a wired network.

A third object of the present invention is to reduce network load on a specific channel by distributing traffic within a communication area composed of a plurality of channels.

The present invention for this purpose is a means for maintaining a state capable of transmitting and receiving data by the terminal station detects a data transmission signal or a pilot signal (ie slot signal) of the base station and always synchronizes to a good channel, By allowing the terminal station to control the protocol as a communication method, there is provided a new network link means for mixing (i.e., selectively driving if necessary) individual call or free access communication methods.

In another aspect, the present invention provides a packet data exchange and transmission means for transmitting the packet data as it is to the other base station connected to the wired network after receiving the packet signal in the base station or by calling a specific mobile station from the base station to perform relay communication.

1 is a block diagram showing an example of an embodiment of a radio base station and a terminal station serving as a communication counterpart for implementing the present invention.

First, the configuration of the base station is as follows.

A PDU assembly unit (1) connected to the DB (10) to prepare data stored in the DB (10) into a packet data unit (PDU) to adapt to a transmission environment;

A slot generation unit (2) for generating a pilot signal of a means for informing that it is a base station signal at a set time interval;

The first input terminal is connected to the PDU assembly unit 1, the second input terminal is connected to the slot generator 2 and outputs the signal of the first input terminal when there is data to be transmitted, and usually outputs the signal of the second input terminal. A switching section 3 composed of means;

A mode (4) of means (4) of an input terminal connected to the switching unit (3) for converting and outputting digital data into an analog signal;

A base station comprising an input terminal connected to the MODEM 4, an output terminal connected to the antenna 6-1, and a means for modulating a signal supplied from the MODEM 4 to an RF frequency of a set channel and delivering the signal to a terminal station. A transmitter 5;

A base station receiver (7) of means for demodulating and outputting a radio frequency signal of a set channel, which is connected to an antenna (6-2) and transmitted from a terminal station, by a low frequency signal;

An input terminal connected to the base station receiving unit 7 and having a mode for converting and outputting an analog signal into digital data;

Input terminal is connected to MODEM (8), restores PDU transmitted from terminal station to original data, saves in its own DB 10 and transmits to remote DB 12 of other base station through separate communication link 11 A PDU decomposition section 9 of means for dispensing;

The input terminal is connected to the output terminal of the PDU decomposition unit 9, and the output terminal is connected to the PDU assembly unit 1, the slot generation unit 2, and the switching unit 3, respectively. DB (10, 10-1) of the means configured to transmit information;

The base station transmitter 5 and the antennas 6-1 and 6-2 of the base station receiver 7 are electrically connected to a wireless communication network 6 of a channel configured to communicate with a plurality of terminal stations.

Next, the configuration of the terminal station will be described.

A PDU assembly unit 13 connected to the DB 22 to generate data stored in the DB 22 into a packet data unit (PDU) to adapt to a transmission environment;

A MODEM 14 of means for connecting an input terminal to the PDU assembly 2 for converting and outputting digital data into an analog signal;

The first input terminal is connected to the MODEM (14), the second input terminal is connected to the channel control unit 20, the output terminal is connected to the antenna 6-1, the signal supplied from the MODEM (14) RF frequency of the set channel A terminal transmitter (15) comprising means for switching the transmission channel by outputting the channel controller (20) after modulating the signal to the base station and the terminal station;

The first input terminal is connected to the antenna 6-2, the second input terminal is connected to the channel control unit 20 to demodulate and output the radio frequency signal of the set channel transmitted from the base station and the terminal station as a low frequency signal, but the channel control unit 20 A terminal receiver (16) configured as a means for switching reception channels by an output of the "

An input terminal connected to the terminal receiving unit 16 and configured to convert and output analog signals into digital data;

A signal detection unit 18 connected to an input terminal of the MODEM 17 to detect a PDU signal existing in a channel and a slot signal of a base station and generate an output when the input terminal falls below a set reference value;

A scan control unit 19 for outputting a scan signal to sequentially switch channels at a set period when an input is connected to the signal detection unit 18 and an output is generated in the signal detection unit 18;

An input terminal connected to the scan control unit 19, and an output terminal connected to the terminal transmitter 15 and the terminal receiver 16, respectively, and configured to switch the transmission channel and the reception channel by the scan signal;

A PDU decomposing unit 21 of means for connecting an input terminal to the MODEM 17 and restoring the PDUs transmitted from the base station and other terminal stations to the original data and storing them in the DB 22;

A DB 22 configured to store input data by connecting an input terminal to the PDU decomposition unit 21 and an output terminal to the PDU assembly unit 13, to perform a process according to Protocol control information, and to transmit data to be transmitted. ;

Configured to electrically connect the terminal transmitter 15 and the RF input / output terminals 6-1 and 6-2 of the terminal receiver 16 to a wireless communication network 6 of a channel configured to communicate with a base station and a plurality of terminal stations. will be.

First embodiment configured as described above The operation of the present invention is as follows, the description of the data transmission system shown in Figures 2 and 3 will be referred to for reference.

First, a process of transmitting information between a base station and a terminal station will be described.

The information stored or input in the data base 10 for transmission to the terminal station is converted from the PDU assembly unit 1 into the PDU (Packet Data Unit) 24 of FIG. 3, and the switching unit 3 and modem 4 of FIG. ), While being amplified / modulated by an RF (Radio Frequency) signal through the base station transmitter 5, is transmitted to the wireless communication network 6.

This radio communication network 6 is composed of several frequency channels (6235 KHz, 8533 KHz ...), for example, a day / night frequency and a nationally allocated frequency group.

In addition, the above-mentioned information is classified into broadcast and communication. In the case of broadcasting, the same information is transmitted to many channels (for example, all channels allocated for broadcasting) operated by a base station. It is called so that information is transmitted only to the linked channel in the link situation that is called.

Although not particularly shown in the drawings, such a broadcast and communication switching function can be easily implemented as a control function for software combining or separating input terminals of transmission units allocated to channels as well as hardware by a switch.

In the above-described process, the RF signal transmitted through the wireless network is transmitted to the terminal receiver 16 of FIG. 1 and amplified / modulated by the terminal receiver 16, and then the signal is transmitted to the modem 17 and the PDU decomposition unit 21. Information (26 in FIG. 3) originally stored in the DataBase 10 of the base station is transmitted to the terminal station DataBase 22 while passing in turn.

 In the present invention, the DB includes a computer system (for example, a server or a client) such as a workstation for controlling data communication. Thus, in particular, the DB 10 can store and retrieve information in a database. Includes a control system for processing a series of information by including a protocol control system for a network management system (NMS).

The information transmitted from the base station through this series of processes is automatically transmitted to the DataBase 22 of the terminal station. In this process, the information stored in the DataBase 10 of the base station can be automatically transmitted at a predetermined time. In addition, the information input by the base station in real time can also be transmitted to the terminal station in real time through the PDU assembly unit (1).

Even when information is transmitted from the terminal station to the base station, the information (26 in FIG. 3) stored in the data base 22 of FIG. 1 passes through the PDU assembly unit 13, the modem 14, and the terminal transmitter 15 in order. Is modulated and transmitted as

The base station receiver 7, the modem 8, and the PDU decomposer 9 receive the data and restore the original information 28 to be stored and processed in the data base 10.

If the data received from the base station is information corresponding to another base station, the PDU decomposing unit 9 transmits the packet data 27 of FIG. 3 to the remote DB 12 through the wired network 11 of FIGS. 1 and 2. The original data 28 is restored and stored and processed by the remote database 12 that receives the data.

For example, the wired network 11 can transmit a long distance by using a WAN which extends the LAN function, and transmits it to a destination by using an address among packet data 27 for HDLC (High-level Data Link Control) procedure of FIG. To help.

This automatic wired / wireless transmission function selects a base station near the coast and transmits its location to the DB of its original destination, Busan, for example, during long-distance navigation (voyage from Busan to Sokcho). You can do it.

An example of the configuration of the wireless packet can be easily seen from the one shown in FIG. 3, but the example of the case of configuring the packet (25 in FIG. 3) will be briefly described as follows.

In general, a wireless packet is a data packet used in a wired network, and a certain header is added and transmitted, and this header includes a pilot carrier, his identification data, his identification data, a protocol control data, and a block. Information (Block Size, Block No.) and the like are included to transmit where and where, and the size of the data block, and the current number of the block is to inform.

In order to efficiently transmit such a packet in a wireless network, for example, an error correction technique using a forward error control (FEC) technique such as Reed Solomon and an error control technique using an automatic repeat request (ARQ) technique are used. In this case, the header of the PDU 24 and the frame check sequence (FCS) of the data block 27 include code for efficiently supporting such error correction and error control.

On the other hand, before performing data communication, it is necessary to perform a process of accessing to perform communication by designating one of a large number of terminal stations, which is divided by time to designate only one of many terminal stations. This is to prevent a collision between packet signals by a third terminal station intervening during communication.

There are two methods of performing channel access, which are divided into individual calling method and free access method, which are controlled by Watchdog & Protocol Controller (10-1) of NMS (Network Management System) function. It performs a function, and it is included in the process of the DataBase (10, 22) periodically and logically controlled.

Next, the process of the terminal station to track and synchronize the channel as follows.

In order to support the channel tracking of the terminal station, the base station may transmit two signals, one of which is the packet data described above, and the other of the packet data, if the base station has no data to transmit, It is a slot signal which transfers (switches) and transmits the slot signal 23 of FIG. 3 generated in the slot generator 2.

In the present invention, the slot signal is also referred to as a free signal, and is used as a signal for allocating a network connection permission and connection time point of the terminal device, and the signal is generated by the slot signal generation unit 2 as its own synchronization signal or separately externally. Can be generated by receiving a clock (Clock).

The terminal station analyzes the ID included in the header of the packet data or the ID included in the slot signal to find out which base station is in the call range. The terminal station can call the base station by calling its base station by setting its ID accordingly. Will be.

If there is no data to be transmitted from the base station, the switching unit 3 transfers the input terminal and transmits the slot signal 23 of FIG. 3 generated by the slot generator 2, and the terminal station receives the same slot signal. It will track the base station channel.

This channel tracking enables communication by selecting good channels that are spatially divided even in the same base station. Especially, in case of short band operation, the terminal station can automatically switch (switch) the day / night frequency or use it at a long distance. Even when there is no time zone, the terminal station of the local area can use it to increase the utilization rate of the frequency without day / night distinction. However, when only the channel is switched within the same base station, the reset operation of His ID may be omitted.

The channel switching (channel switching) action is described in detail as follows.

In FIG. 1, the packet data or the slot signal received from the terminal receiver 16 includes a pilot signal capable of measuring the reception intensity and taking the channel synchronization, and the signal detector 18 detects this signal and is less than or equal to the set value. An output is generated when a signal is generated, when data is not restored correctly, or when there is too much traffic on the channel.

However, as a method for measuring reception sensitivity, the output of the receiver 16 may be directly connected to the signal detector 18.

The output of the signal detection unit drives the scan control unit 19. Accordingly, the scan control unit outputs pulses at predetermined intervals, for example, at intervals of 5 seconds to drive the channel control unit 20. FIG.

Since the output of the scan control unit 19 acts as a trigger signal to sequentially switch to the designated channel number at predetermined time intervals, the channel control unit 20 selects the channel number of the transmitter and receiver of the terminal station whenever a pulse output is input. For example, 42, 43, 44, 45, ...

The specific configuration of the scan control unit 19 and the channel control unit 20 can be easily configured with a multivibrator, shift resistor, and ROM. Recently, such a function is mostly composed of a micro-coputer and an execution program. In order to facilitate the understanding of the description, the present invention will be divided into these functional blocks.

4 and 5 illustrate a hierarchical structure diagram and a flowchart of a wireless data network access control method according to the present invention.

Now, the control method of the present invention will be described in detail with reference to FIGS. 4 and 5.

As shown in FIG. 4, the present invention is composed of five layers: an initialization step, a channel tracking step, a wireless network access control step, a data transmission step, and a data exchange / processing step.

First, when the power is applied, the system performs an initialization step of clearing the transmission output and uploading the set condition.

In this process, the system stops all transmission output and uploads the preset condition. In particular, the terminal station recognizes the assigned channel number, recognizes its own channel and another channel, designates the sequence number, Set up the system by uploading preset values such as scan specified range of channel, initialization designated channel, reception level and transmission level initialization, and various time delay conditions.

If the transmission data is inputted from the user or the associated system (106, 107), this process is performed up to the process of creating 105 as a PDU and storing it in the transmission buffer (104). The sensor input signal of a certain period used in the back may also be included.

The system then receives a signal from the base station on the initialized channel to perform a channel tracking process that tracks the good channel and corrects the communication partner.

In this process, the pilot signal of the base station included in the packet data or the slot signal when there is no packet data is received (108). When the signal falls below the reference value, the channel of the base station to which it belongs is first scanned (109, 110). When the received signal is not good in any channel, the channel tracking step is performed by scanning channel signals of other base stations (111, 112, 113, 114, and 115).

In this process, especially when the other base station channel is tracked, it receives the ID of the corresponding base station and performs the process of adjusting the His ID (the other party's ID) accordingly (117), which is the communication channel of the tracked base station. This is a necessary process to perform communication in the channel afterwards by registering accordingly.

In addition, in this process, it is possible to select a good channel between each other in consideration of the reception status of the base station as well as its own reception status. When the link is not established in the wireless network access control step 1002, the other party (base station) signals. It is the process of disconnecting and re-tracking the channel, recognizing that it does not capture (116).

Therefore, the channel tracking step of this process plays a role of channel synchronization, which enables the terminal station to maintain an optimal communication state by automatically catching another base station and automatically correcting the communication counterpart according to its ID even if the base station leaves the service area.

His ID automatic calibration function according to the present invention is a function that can be particularly effective when operating the Polling Protocol, as is well known in the field, the Polling Protocol is activated (except in the case of ships anchored in the port Only the vessels sailing in the sea are limited, and the following calls can be made to reduce the traffic significantly by selectively calling only the terminal stations. However, if the terminal station leaves the communication area of the base station to which the terminal station belongs, other mobile stations have been moved. The station (whether or not the terminal station is activated) is not known because there is a defect excluded from polling to solve this defect is His ID change function of the present invention.

In other words, when the terminal station leaves the communication right (meaning to be removed) and calls the base station with the changed His ID and registers the channel access with its own ID, the corresponding base station is added to the polling target list (ie Polling Table) of the corresponding channel. It automatically registers the new station ID and informs the base station of the result through the wired network. Therefore, the defect is solved. As a result, the base station is the HLR (Home Location Resistor) in the cellular phone, and the base station is the cellular. It operates as a roaming function by playing the role of a VLR (Visitor Location Resistor) in the phone.However, unlike Cellular, which the terminal station transmits its location from time to time, it registers His ID before and after the departure of the communication right or the activation of the terminal station Considering the movement characteristics of the ship moving at a slow speed, You get an excellent effect that almost eliminates communication.

The system performs a wireless network access control step of access control of a terminal apparatus by controlling protocol traffic information by controlling protocol control information through a wireless network. (1002 in FIG. 5 and 1005 in FIG. 6)

This process includes transmitting the control information (Protocol Control in FIG. 23 of FIG. 3) to indicate (command) the Contention or Polling Protocol to the slot signal of the base station so that the terminal station selects the communication method accordingly.

For example, when there is not much traffic, the base station transmits a Contention command signal, and when the base station monitors the signal of the channel and there is a lot of traffic and a collision occurs between data, the base station transmits a command signal to switch to polling. It will be described in detail as follows.

Initially, when the base station informs the terminal station of the Free signal that the base station operates with the Contention Protocol, the terminal station attempts to connect by calling the base station in a mutually competitive manner.

Common contention type wireless network access protocols include ALOHA and CSMA / CA, and slotted ALOHA and Sloted CSMA / CA are improved methods.

Since this description belongs to another technical field, a detailed description thereof will be omitted. However, in the present invention, if the period of the slot signal transmitted by the base station at a predetermined period is very short, it can be operated by slotted ALOHA or Sloted CSMA / CA. I want to.

If the call request for access to the base station is increased at the terminal station, the collision rate between the transmitted data is increased, the base station attempts to restrict the traffic by limiting group polling, so that only the terminal station belonging to the designated group attempts to connect. (119, 121, 120, 124)

This group polling, for example, restricts up to IDs 1 to 10 of various terminal stations 1 to 100 to instruct a competitive connection attempt and assigns up to IDs 11 to 20 when communication is completed. In order to attempt a competitive connection, the group is specified in order.

In the present invention, the term group polling that attempts to contention within a designated group is meant to include means for attempting to link to the sloted ALOHA or sloted CSMA / CA in a limited number of terminals.

If it is judged that the group polling is inadequate or the collision continues, the base station instructs the connection to the Polling / Answering Protocol which sequentially commands all the terminal stations one by one, and the terminal stations respond in the order of calling by the base station. (123, 124)

This Polling Protocol is a watchdog function of the NMS that monitors the network for a specified period of time and operates only when the call connection failure rate increases. For example, two or more nodes can simultaneously access one channel. If you try.

Therefore, due to this time division type call connection process, even if many terminals are concentrated in a wireless channel, which is a narrowband single communication channel, call connection of a terminal station can be efficiently controlled, and unnecessary transmission delay or communication network connection can be minimized by minimizing collision between data. Congestion can be prevented.

Of course, if the base station needs to unilaterally transmit broadcast information 122 to the terminal station, in this case, the protocol control function may be excluded and the base station may unconditionally transmit a signal to the terminal station. You will know well.

The protocol control information processing method (slot signal of FIG. 3) related to the base station in the radio network access control step 1002 of FIG. 5 described above is described in more detail with reference to FIG.

FIG. 6 illustrates an example of a sub routine that processes a PCI (Protocol Control Identifier) by monitoring a channel at a base station. The base station monitors a data transmission success rate of a channel to change protocol control information so that a communication link of a terminal station is smoothly performed. A flowchart of a sub-process is shown to perform a protocol control process (1005) to support the operation.

That is, in order to allow the terminal station to perform the process (1002) of FIG. 5, the base station monitors the channel at a set time interval as shown in FIG. 6, and transmits a Contention command if the bit error rate (BER) per unit time is low. (201, 202, 203, 204, 205)

If BER is normal, send Group Polling command (206, 207, 208).

If BER is high, send polling command (209, 210, 211).

The high BER means that the channel is monitored for a set period of time, but there is a signal in the channel, but the transmission success rate is lowered. For example, this method is used to analyze and compare the signals present in the channel with the data output from Modem (8). BER can also be measured.

Accordingly, the base station monitors the channel to automatically control the access protocol of the terminal station by the series of processes 1005 of FIG. 6, thereby efficiently controlling the terminal apparatus of the wireless network access control step 1002. Connection control is possible.

This network management system (NMS) operation is shown as being performed by the Watchdog & Protocol Controller 10-1 in FIG. 1 of the physical configuration, but in practice, 10-1 is implemented as part of the DB 10 process. As a result, a separate physical shape may not exist.

Network monitoring and PCI processing of the Watchdog & Protocol Controller 10-1 is performed by detecting the output signal of the PDU decomposition unit 9 and / or the signal of the receiving channel, and the command signal generated after the PCI processing is performed by the PDU assembly unit 1. Or the terminal is supplied to the slot generation unit 2 and delivered to the terminal station. When the collision occurs due to an increase in the traffic of the terminal station during the contention method, the base station forcibly stops the signals of all the terminal stations. Network All Stop) command signal is transmitted, and then the terminal station is controlled by changing the Protocol Control signal to Group Polling (Group Sloted CSMA / CA) or Polling.

The protocol control information is supplied to the slot generation unit 2 or the PDU assembly unit 1 and transmitted to the terminal station in any one of them. If the base station and the terminal station are exchanging information, the PDU assembly unit 1 It may be delivered by a path supplied to the base station, and if the base station is not communicating, it may be periodically transmitted to the terminal station through the light roll of the slot generation unit (2).

The above path switching is performed by switching the contact point of the switching unit 3. The base station determines whether the channel is used or not and controls the output signal of the watchdog & protocol controller 10-1 connected to the switching unit 3. However, since the switching unit 3 is also a logical thing consisting of the process of the DB 10, it is common that a physical shape does not exist.

After the wireless network is connected, the system performs a data transmission step of receiving and transmitting packet data.

In this process, the terminal station and the base station communicate with each other as an acknowledgment (ACK) signal when the packet data is received, and in response to a negative acknowledgment (NACK) signal when the reception of the packet data is completed (125, 126, 127, 128, 129), in this case, the commonly used protocol is ARQ.

Recently, Adaptive ARQ, which automatically adjusts the transmission speed and the size of the packet block, has been put into practical use, and is effectively used to transfer large data.

In this step, if the processes of receiving broadcasts (122, 126) are included, the terminal station generally does not respond to the reception completion status with an ACK (or NACK) signal.

When this step is completed, the system performs two functions (Multi Tasking) for a while. One is the channel synchronization 1001 process, which starts again from the original channel tracking process, and the other processes the received data. Data exchange and processing 1004 process.

The system performs a data exchange / processing step of storing data transmitted to itself among the received data and relaying data corresponding to another base station.

In this process, when data to be decomposed and stored in a PDU has been transmitted to its own DataBase 10, the data is stored and processed for each Table Address (131, 132, 133), and the data to be stored in another remote Database 12 (12). A wired network packet (27 of FIG. 3) is constructed and transmitted to the corresponding remote site. (131, 132, 134, 135, 136)

However, the packet 27 may be transmitted from the base station to another base station through the Internet such as X.25, Frame Relay, ATM, or the like, and may be transmitted from the terminal station to another terminal station through the wireless network. It can also be seen that the mobile station can be used as a base station for a broadcasting station or a relay communication base station after the call.

Although the detailed description is omitted in the present invention, it is possible to perform a separate call first using a Polling List and to allocate sloted ALOHA or Slotted CSMA / CA fixedly for the rest of the time. It can be seen from the principle.

The signal detection function, channel switching function, and ID setting function receive the signal from the base station and check the signal strength, the completeness of the data block, and the excessive waiting time. For example, if the channel of the same base station is selected in the function or ID setting function that supports the Polling Protocol by changing to the His ID of the other station from the transferred channel and calling or waiting for the other station It is efficient to omit it.

As described above, the channel synchronization function may naturally include means for changing His ID when the terminal needs to transmit data while waiting as it is without registering a channel.

If the transmission frequency and reception frequency are the same as the channel switching function, it operates in one frequency communication mode and in the case of different transmission frequency and reception frequency.

Contention function, group control function, and polling function transmit the designated signal from the base station to the terminal station in order to efficiently manage the traffic of the communication network, and the group control function as a function that the terminal station receiving the signal automatically changes the protocol. Is expressed functionally as a "Group Oder Priority Contention Protocol" function.

PDU creation / decomposition function and data transmission function are functions that construct or restore a Packrt Data or Slot signal, and are functions to ensure transparency of data transmission including data blocks used in wired network.

The data exchange function (data processing function) refers to a relay transmission function that re-transmits the data required for another remote DB after restoring the PDU using a wired network or another wireless network.

The storage / output function refers to a function that processes information necessary for operating various systems such as setting reference values for network management, network monitoring, data transmission / reception process, and expressing / saving received data. An optional means of selectively applying one or all of the output functions is called a data processing function.

The present invention is a block diagram showing and explaining the configuration of a very small part of many techniques that can be carried out design using a basic algorithm, the present invention is not limited to the above embodiment.

Embodiments of the present invention as a network configuration may be used to form a forming network of a mobile base station.

A technique for setting a communication environment by the terminal itself using a base station slot signal as a system control function includes automatic gain control (AGC) and automatic frequency control (AGC). It can be configured as a "communication channel matching means" for remotely controlling the remote control and the transmission output of the communication channel, but a detailed description is omitted since it is a category that can be easily implemented from the above description of the present invention.

On the other hand, in the configuration of the base station, when transmitting high power by short-wave radio, the transmitting station and the receiving station are generally installed at a distance of 2 km or more, and the receiving station and the adjacent performance station (communication station) are connected by a dedicated line. In the same case, the remote control between the base station transmitter 5 and the MODEM 4, the switching unit 3 and the MODEM 4, the receiver 7 and the MODEM 8 or the MODEM 7 and the PDU decomposition unit 9 Remote controller) amplifier and a dedicated circuit is connected, but the detailed description is omitted because it is a known technology in this field.

In the description of the present invention, each MODEM connected to the transmitting / receiving apparatus of the base station or the terminal station is virtually integrated into one.

In the configuration of the present invention, a base station configuration and a PDU assembly section 13 composed of a DB (10), a PDU assembly section (1), a slot generating section (2), a switching section (3), and a PDU decomposition section (9) Naturally, the physical configuration of the terminal station composed of the PDU decomposition unit 21 and the DB 22 may be a logical configuration consisting of a series of processes using a computer, and the MODEM (4, 8) of the base station. And the physical structure of the MODEM (14, 17) of the terminal station are each configured to be integrated for transmission / reception, but for convenience of description in the present specification is shown as a separate configuration is not limited to the configuration shown in the embodiment .

As can be seen from the above description, according to the present invention, when the terminal station and the base station are connected to the wireless data network in the N: N environment, the traffic of the wireless data network is efficiently distributed or managed, and the wired / wireless network or the wireless / Wireless network can be efficiently linked, it is possible to efficiently build a wide-area automatic data transmission system, especially a wireless data communication network that can be connected to many terminals.

In addition, the present invention eliminates the need for dialing during data transmission, and ensures rapidity in data transmission since the terminal station can always listen to the signal of the base station.

In the case of using the present invention, a narrow-band short-wave communication network can be used to construct an efficient data transmission / exchange system on the sea. A ship data communication system or a GPS (Global Positioning System) and a sensor are attached to the moving object to drift. This makes it possible to extend the observation point to a wide range of areas at extremely low cost when used in marine science or water quality observation.

When the present invention is used in the field of meteorological observation, it is possible to establish an efficient data communication network with many observation points in the mountainous regions, and also to efficiently collect observation information by automatically switching channels even when the communication channel state frequently occurs in a weather situation.

In particular, in the present invention, an efficient traffic distribution control function by changing his ID or protocol remote control is able to configure overlapped base station communication area in a low frequency band (short band, etc.), thereby eliminating the Skip Zone. In addition to providing a good communication service, it is a very advantageous invention because it has an excellent effect such as actively preventing signal collision of the terminal station in the same channel, thereby greatly improving the use efficiency of the channel.

1 is a block diagram showing an exemplary embodiment of a radio base station and terminal station system of the present invention.

2 is a schematic diagram showing an example of implementation of a wired / wireless wide area data transmission system.

3 is a block diagram of wireless packet data transmitted in FIG.

4 and 5 are a hierarchical structure diagram and a flowchart of a wireless data access control method of the present invention.

6 is a flowchart showing an example of a method for controlling a protocol at a base station in FIG.

Claims (19)

In a wireless data network access control method of a base station in which at least one terminal station performs wireless data communication with a base station as an asynchronous time division in a wireless data network having a wireless channel interworking with a plurality of terminal stations, A pilot signal transmission step of transmitting a recognition signal in a radio channel so that the terminal station is waiting and in a good radio channel can be linked; A protocol control step of controlling a link method of a terminal by transmitting a 'protocol control signal' through a polling or free access command in a radio channel of a base station; A 'data transmission and reception step' of transmitting and / or receiving data between the base station and the terminal station by link execution by a terminal station call and / or a base station call according to the link method; Performing wireless data communication as a data transmission and reception step while preventing or reducing collisions between a plurality of terminal station signals in a wireless channel by variably transmitting a pilot signal and a protocol control signal from a base station by interworking the pilot signal transmission step and the protocol control step. Wireless data network access control method comprising the configuration. The method of claim 1, The 'protocol control signal' detects the traffic conditions of the terminal stations that are performing link linking to the base station to free access in the normal first set traffic, group call in the second set traffic more than the first set, more third than the second set A wireless data network access control method comprising a variable transmission in a set call to an individual call protocol control signal. The method of claim 1, The 'protocol control signal' includes a configuration in which any two or more of free access, group call, and / or individual call are randomly arranged on the time axis and fixedly transmitted regardless of whether the terminal stations detect the traffic state. Wireless data network access control method characterized in that. The method of claim 1, The 'protocol control signal' is a wireless data network access control method comprising a configuration for transmitting in a pilot signal which is a periodic recognition signal of the base station. The method of claim 1, The protocol control signal is a wireless data network access control method comprising a configuration for transmitting as a base station broadcast packet signal when necessary. The method according to any one of claims 1 to 5, The data transmission and reception step includes a configuration of storing the history of the terminal station linked with the base station in a polling table to reduce the unnecessary traffic in the group call and / or the individual call by interworking with subsequent terminal station calls. Wireless data network access control method, characterized in that. The method according to any one of claims 1 to 5, The data transmission / reception step includes a method of transmitting data of a terminal station received at a base station to a third destination. Asynchronous time division in a wireless data network of a base station transmitting protocol control signals over a wireless channel in order to efficiently interwork a plurality of terminal stations. In the control method, 'Pilot signal reception step' of receiving a pilot signal transmitted from a wireless channel and recognizing whether a link is available in a waiting and waiting state on a suitable wireless channel; A 'protocol following step' following the link method command of the base station in response to the transmission of a protocol control signal through a individual calling or free access command in a radio channel of the base station; A data transmission / reception step of transmitting and / or receiving data between a base station and a terminal station by calling a terminal station and / or link execution by a base station call according to the link method; Wireless data, characterized in that the wireless data communication comprises a configuration that the terminal performs the wireless data communication as a data transmission and reception step while responding and following the pilot signal and the protocol control signal that is variablely transmitted from the base station in conjunction with the pilot signal reception step and the protocol following step Network connection control method. The method of claim 8, The 'protocol tracking step' includes a configuration for executing a link corresponding to any one or more link methods among free access, group call, and individual call according to a protocol control signal of a base station. The method of claim 8, The ID (identification symbol) of the terminal is linked to the wireless channel of the base station by link execution so that the base station knows that the terminal station is waiting on the wireless channel by interworking with the pilot signal reception step and / or the protocol following step. Wireless data network access control method comprising a configuration to register (List). The method according to any one of claims 8 to 10, The data transmission and reception step includes a method for transmitting data of a base station or another terminal station received from a terminal station to a third destination. In the configuration of a wireless data network transmission system of a base station in which at least one terminal station performs wireless data communication with the base station as an asynchronous time division in a wireless data network in which a plurality of terminal stations are linked by connecting each antenna to a wireless channel, PDU assembly means 1 for creating packet data, slot generation means 2 for generating a pilot signal, which is a channel recognition signal at a set period, and PDU assembly means 1 and slot generation means 2, if necessary. And switching means 3 for generating an output according to the set conditions, MODEM means 4/8 for converting signals from the switching means 3, and signals supplied from the MODEM means 4/8. It consists of a base station transmitter (5) for modulating the channel frequency to propagate to the antenna (6-1), the switching means for generating an output according to a set condition is a packet data or a pilot signal as a free connection or individual call command A base station transmission control device configured to variably transmit a protocol control signal as a signal to instruct a link method to a terminal station; A base station receiver 7 for demodulating and outputting a radio channel signal received from a terminal station via an antenna 6-2, MODEM means 4/8 for converting signals from the base station receiver 7, and MODEM means A base station reception control apparatus configured as PDU decomposition means 9 for restoring the packet data PDU received through 4/8 to original data; The computer 10 configured to store and process data transmitted and / or received, including the PDU assembly means 1, the slot generation means 2, the switching means 3, and the PUD decomposition means 9 interlocked. '; The base station transmission control device and the base station reception control device and the computer 10 interwork with each other so as to form a wireless data communication network 60, and the pilot signal and the protocol control signal at the base station by allowing the computer 10 to be controlled or automatically driven. And means for performing wireless data communication by appropriately and variably transmitting, while preventing or reducing collisions between a plurality of terminal station signals in a wireless channel. The method of claim 12, The computer 10 detects the traffic conditions of the terminal stations that are linking to the base station to free access in the normal first set traffic, group call in the second set traffic more than the first set, and more than the second set. And means for connecting a watchdog & protocol controller (10-1) for protocol control in order to variably transmit an individual call protocol control signal in three set traffic. One or more terminal stations perform wireless data communication with the base station as an asynchronous time division of the wireless data network of the base station that transmits protocol control signals as a wireless channel in order to connect each antenna to the wireless channel and to efficiently interoperate a plurality of terminal stations. In the wireless data network transmission system configuration of the terminal station to PDU assembly means 13 for creating packet data, MODEM means 14 for converting signals from PDU assembly means 13, and signals supplied from MODEM means 14 are amplified / set at the RF frequency of the set channel. A 'terminal station transmission control device' configured as a terminal transmitter 15 for transmitting to the base station and / or the terminal station via the antenna 6-1 after modulation; A terminal receiver 16 which is connected to the antenna 6-2 and amplifies and demodulates a radio channel signal received from the base station and / or the terminal station, and MODEM means 17 for converting a signal from the terminal receiver 16; A terminal station reception control device configured as PDU decomposition means 21 for restoring the packet data PDU received through the MODEM means 17 to the raw data; The PDU assembly means 13 and the PDU decomposition means 21 interlock with each other to store and discard data transmitted and / or received, and to correspond to a free access or individual call command signal from a base station and / or another. 'Computer 22' configured to execute a link with the terminal station; The terminal station transmission control device and the terminal station reception control device are interlocked with the computer 22, and the computer 22 is controlled or automatically driven by the user so that the base station can variably transmit a pilot signal and / or a protocol control signal. And means for performing 'wireless data communication' in response to and following the operation of the device. The method of claim 14, The means for performing the wireless data communication is the computer 22 commanding link execution corresponding to any one or more link methods of free connection, group call, and individual call according to a pilot signal or a protocol control signal of a base station. And means for performing wireless data communication by interworking the 'terminal station transmission control device' and the 'terminal station reception control device' with a computer (22). The method of claim 14, Channel control means for switching the wireless channel at a predetermined interval to the terminal station reception control device or the computer 22, but below the set reception level and to 'wait' to the radio channel above the set reception level. 20) ' The 'terminal station reception control apparatus' receives pilot signals or packet signals transmitted from the base station and / or the terminal station from the output path of the MODEM 17 and drives the channel control means 20 to satisfy the set conditions. A wireless data communication system comprising means for waiting for a wireless channel in which a channel is automatically searched and set, and in which a suitable condition is satisfied. The method of claim 16, The 'channel control means 20' is also linked to the 'terminal station transmission control apparatus' to automatically switch the frequency of the terminal station transmission control apparatus as a frequency corresponding to the 'waiting' radio channel when performing data communication. And a means for performing the wireless data communication system. In a wireless data network of a base station that transmits protocol control signals as a wireless channel so as to connect each antenna to a wireless channel and efficiently interoperate with a plurality of terminal stations, at least one terminal station performs asynchronous time division to perform wireless data communication with the base station. In order to configure the wireless data network transmission system of the terminal station to be performed, the terminal station reception control apparatus and the computer 22 including the MODEM means 14/17, the channel control means 20, and the antenna 6-2 are provided. In the configuration of the terminal station transmitting apparatus of the wireless data communication system connected to perform the communication, The first input terminal is connected to the MODEM means 14, the second input terminal is connected to the channel control means 20, and the output terminal is connected to the antenna 6-1, the signal supplied from the computer 22 interworking MODEM means 14 Amplifying and modulating the RF signal to a base station and / or a terminal station, the transmission channel control means 20 interlocked with the channel control means and received by the output of the transmission channel interlocking control means 20. And means for executing a link with a base station and / or another terminal station in response to a free access or an individual call command signal at the base station by automatically switching a channel of the terminal transmitter as a transmission channel paired with the channel. Wireless data communication system. In a wireless data network of a base station that transmits protocol control signals as a wireless channel so as to connect each antenna to a wireless channel and efficiently interoperate with a plurality of terminal stations, at least one terminal station performs asynchronous time division to perform wireless data communication with the base station. A wireless data communication system for interworking a computer 22 with a reception control device including an antenna 6-2, a MODEM means 17, and a channel control means 20 for performing and / or receiving broadcast data of a base station. In the terminal station terminal device configuration of, The first input is connected to the antenna 6-2, the second input is connected to the channel control means 20, the output is connected to the MODEM means 17, while the output of the MODEM means 17 is connected to a computer ( 22, amplifying and demodulating and outputting a radio channel signal transmitted from a base station and / or a terminal station, and interlocking with an output path of the MODEM means 17 and / or an input path of the MODEM means 17 to control the channel control means ( 20) by automatically searching for a pilot signal or a packet signal of a base station that satisfies the set conditions and setting up a channel and waiting in the set channel, as well as' a protocol of a base station that is freely connected or individually called in a waiting wireless channel. Means for responding to and following a control command to perform wireless data communication "and / or" receive wireless data provided by broadcast ".