KR100200553B1 - Method of connecting subscriber to subscriber in mobile communication system - Google Patents

Abstract

The present invention adopts CDMA (Code Division Multple Access) as a multiple communication method in a mobile communication system, and directly moves between terminals to enable direct communication between terminals using a code sense technique for call connection. A communication system and method are provided.

An object of the present invention is to give a spreading code unique to each mobile terminal by CDMA, and to spread the spreading codes of all mobile terminals in each mobile terminal, thereby generating a spreading nose of the other terminal during communication. It is to provide a system and a method for making a call directly with a counterpart mobile terminal being used to enable direct call between terminals.

After all, the present invention is not competing for the acquisition rights for the channel, unlike the conventional competition to obtain access rights for the terminal to which the user wants to access it is difficult to access due to the use of random channels It solves the existing problem and also provides the reliability of the channel connection by quickly and accurately knowing the channel state of the terminal to which the user wants to connect.

Description

Direct mobile communication system and method between terminals

Detailed description of the invention

(Purpose of invention)

TECHNICAL FIELD OF THE INVENTION AND FIELD OF THE INVENTION

In the present invention, a mobile communication system adopts code division multiple access (CDMA) as a multiple communication method, and enables direct communication between terminals by using a code sense technique for call connection. And to a method.

In this case, the direct communication means that the terminal A and the terminal B can directly establish a call without going through an exchange or a base station.

In general, the conventional method of communication used in a mobile communication system or a satellite uses a call establishment method using a time division multiple access (TDMA).

Such a communication method is a method of dividing a channel in time so that users compete for each time slot to obtain a time channel. In other words, the number of time channels is limited so that all users cannot have their own time channels. As a result, a large number of users are bitten in a small number of channels, which makes it difficult to connect and requires waiting time. In the case of digital CDMA cellular, wireless base stations must have a function of connecting terminals in a single area. You can only make calls through the radio base station.

A schematic configuration of such a mobile communication system is shown in FIG.

In other words, the cell is divided by the wireless base station to which each mobile terminal is subscribed, and if the user wants to make a call with the mobile terminal subscribed to another wireless base station, the mobile station is connected to the wireless base station to connect the wireless base station. It is done.

Accordingly, the present invention is designed to solve the above problems, by giving a unique spreading code to each mobile terminal by the CBMA method, and to communicate by spreading the spreading codes of all mobile terminals to each mobile terminal. It is an object of the present invention to provide a system and a method for directly making a call with a counterpart mobile terminal in reception waiting by discharging a spreading code of a counterpart terminal.

In the direct mobile communication system of the present invention for achieving the above object, in the direct mobile communication system using a mobile terminal of the CDMA method, it stores the high codes of all the mobile terminals, and in the case of receiving standby, It is generated by spreading the bandwidth to the communication channel, if the transmission is generated by the unique code of the other terminal is characterized in that the terminal consists of the tea terminal to make a direct call by connecting the communication path.

The direct mobile communication method between terminals is a direct mobile communication method using a CDMA mobile terminal, comprising: a first step of memorizing a unique commodity by a CDMA method assigned to each mobile terminal, and a call after the first step; A second step of confirming whether a number of a terminal to be input is input; a third step of generating a spread spectrum of a unique code of the user if there is no input in the second step and checking a call channel; A fourth step of checking whether the spreading code received through the channel matches its own code and if there is a call request, making a call connection and connecting a call path; A fifth step of checking a channel state by generating a spread spectrum of a unique code of a corresponding terminal when the number of the counterpart terminal is input in step 2; In the fifth step, if the strength of the received data spread from the counterpart terminal is weak, it checks that the call is in progress, and terminates the call. Characterized in that.

1 is a schematic configuration diagram of a general mobile communication system

2 is an exemplary configuration diagram of a direct mobile communication system between terminals according to the present invention;

2a is a block diagram of a direct mobile communication system between terminals;

2b is a block diagram of a direct mobile communication system between terminals using satellites;

2c is a block diagram of a direct mobile communication system between terminals using a hub

3 is a schematic configuration diagram of a mobile terminal in FIG.

4 is a schematic configuration diagram of a hub in FIG. 2C;

5 is a flowchart illustrating a direct mobile communication operation between terminals according to the present invention.

* Explanation of symbols for the main parts of the drawings

11,21 input unit 12,22 output unit

13,23: memory section 14,24: channel processing section

14a: spread spectrum unit 14b: intermediate frequency modulator

14c, 14d: high frequency part 14e: intermediate frequency demodulation part

14f: band reduction part

Hereinafter, with reference to the accompanying drawings an example of the present invention in more detail as follows.

2 is an exemplary configuration diagram of a direct mobile communication system between terminals of the present invention, FIG. 2A is a configuration diagram of a direct mobile communication system between terminals, FIG. 2 is a configuration diagram of a direct mobile communication system between terminals using satellites, and FIG. Is a block diagram of a direct mobile communication system between terminals using a hub.

3 is a schematic configuration diagram of a mobile terminal according to FIG. 2, FIG. 4 is a schematic configuration diagram of a hub according to FIG. 2C, and FIG. 5 is a flowchart of a direct mobile communication operation between terminals according to the present invention.

Here, the configuration of the mobile terminal and the hub for its configuration prior to the description of the configuration of FIG.

This will be described with reference to FIGS. 3 and 4.

The mobile terminal according to FIG. 3 includes an input unit 11 for inputting a signal by a user, an output unit 12 for displaying an operation state of the terminal, and a unique code and related information by a CDMA scheme set in each terminal. Reads from the memory unit 13 a unique code corresponding to the number of the memory unit 13 which can be changed and referenced by the user and the relative non-terminal terminal inputted to the input unit 11. The controller 15 checks whether the received signal matches its own code while controlling to generate the signal, and spreads a specific code generated by the controller 15 to the original state. The channel processing unit 14 sent to (15) is referred to.

The channel processor 14 is a band spreader 14a for spreading a specific unique code by the controller 15, and a band reducer for restoring the received spreading code to original data and sending it to the controller 15. 14f and the analog signal of the digital signal of the spread spectrum unit 14a.

An intermediate frequency modulator (14b) for modulating a call, and an intermediate frequency demodulator (14e) for demodulating the received analog signal into a digital signal and outputting the demodulated signal to the band reducing unit (14f). The high frequency unit 14c converts the intermediate frequency signal of the intermediate frequency modulator 14b into a channel frequency and outputs it through an antenna, and restores the channel frequency received through the antenna and outputs the channel frequency to the intermediate frequency demodulator 14e. The high frequency unit 146 is included.

The hub according to FIG. 4 includes an input unit 21, an output unit 22, a memory unit 23, a channel processing unit 24,

And a portion 25.

If there is a difference from the mobile terminal of FIG. 3, since the hub must communicate with several terminals at the same time, the channel processor 24 includes a channel processor connected in parallel to the number of mobile terminals.

Here, the hive connects the communication paths of mobile terminals in a region where direct transmission and reception are not possible and should be provided with channel processing units as many as the number of mobile terminals in the region.

In this way, the mobile terminal has a module for generating a spreading code with the memory device, and retrieves the information of the memory device to communicate the spreading code of the desired terminal. This can be likened to how a telephone line in a landline or cellular phone has a unique telephone number, and the telephone number of the telephone to communicate with is set up by a caller. That is, the unique wax code of each terminal corresponds to the telephone number, and the generation of the spreading code corresponds to pressing the telephone number, and the call setup by the spreading code matching check corresponds to the call being set up by the exchange.

Accordingly, the mobile communication system according to the present invention has a great advantage that it does not need a medium such as an exchange in the middle of the direct communication between the terminals. Each terminal attempts a direct call connection only with a known counterpart's code and completes call setup, thus eliminating the need for an intermediate agent.

As a result, as shown in FIG. 2A, a direct call in the mobile terminal period becomes possible.

However, as shown in FIG. 2A, the call is limited to a radio wave reaching area only in a mobile terminal period, so that the call can be used only in a limited small system such as an airport, a port, a construction site, and the like.

In this case, as shown in FIG. 2B, since the entire nation of Korea can be bundled with one satellite, all the terminals exist in one cell, thereby enabling direct communication of the mobile terminal period using the satellite.

In addition, a hub may be used as shown in FIG. 2C, in which a radio wave reaching area of a mobile terminal is further expanded without using satellites. That is, by installing a hub in an area where radio waves are hard to reach and storing unique codes of various mobile terminals, the mobile terminal corresponding to the received signal is connected to the mobile terminal of another region to enable direct communication of the mobile terminal period. .

The operation for direct communication in the mobile terminal period as described above will be described with reference to FIG. 5 as follows.

At this time, each mobile terminal and the hub has a unique code, each terminal knows the code information for all the terminals in the room and also know the code of the hub (step S1). This is accomplished by entering the corresponding information into the memory of each terminal when configuring a cell.

Each terminal uses this information to make a connection using the code of the other terminal device desired by the terminal, and the terminal which does not transmit has a standby state for continuously searching the channel with its own code.

That is, the terminal to communicate first checks whether the number of the other mobile terminal is input, and if the input is confirmed, the terminal searches for whether the code of the other terminal to be used is currently being used (steps S2 and S7). Then, if not in use, a call connection attempt is initiated to connect the call path and start a call (steps S8, S10 to S12), whereas if in use, terminate the call and try again (steps S8 to S9).

On the other hand, if the number of the other mobile terminal is not entered, it enters the waiting state of receiving, which generates its own code, checks the call channel and checks the call request according to whether the received signal matches. (Steps S3 to S6)

The above process will be described with an example.

Here, for example, the terminal A has a spreading code Cl as its own code, and the terminal B has a spreading code C2 as its own code.

The terminal that does not communicate periodically or continuously checks the channel with its own code to check whether there is a terminal that wants to communicate with itself. This process is called Code Sense.

Since each terminal has information about each other's code in memory, when terminal A wants to communicate with terminal B, it first checks the channel state by generating spreading code C2 to see if terminal B is communicating with another terminal. do. If the terminal B is talking to the other terminal, the terminal A obtains the correlation value of the maximum value and waits for the terminal B to communicate with the other terminal. On the other hand, if it is determined that the terminal B is not communicating with the other terminal, the terminal A can communicate with the terminal B with the spreading code C2.

As described above, according to the present invention, since the present invention is not competing for the acquisition right for the channel, but for competing for acquiring the access right for the terminal to which the user wants to access, the random channel It solves the existing problem that the necessary connection is difficult due to the use, and also provides the reliability of the call connection by quickly and accurately knowing the channel state of the terminal to which the user wants to connect.

Claims (4)

In a direct mobile communication system using a CDMA mobile terminal, the unique code of all mobile terminals is stored, and when the receiver is waiting, its own code is spread by the call channel. A mobile communication system between terminals, characterized in that the spreading occurs by the spread of the unique code of the mobile terminal to make a direct call by connecting the communication path. According to claim 1, Direct mobile communication system between the terminal, characterized in that for connecting the direct communication by the mobile terminal via a satellite. According to claim 1, Direct mobile communication system between the terminal characterized in that performing the direct communication by the mobile terminal through a hub connecting the channel processing of several mobile terminals in the middle. In the direct mobile communication method using a CDMA mobile terminal, a first step of storing all the unique code according to the CDMA method assigned to each mobile terminal, and whether the number of the mobile terminal to be called after the first step is inputted A second step of verifying, and a third step of inspecting a communication channel by proliferating a self-unique code if there is no input in the second step; the spreading code received through the own communication channel in the third step is self-unique A fourth step of confirming that there is a call request and confirming that a call is matched, and making a call connection and connecting a call path; when the number of the other mobile terminal is input in the second step, spread the unique code of the corresponding terminal A fifth step of generating a channel state and checking the channel state; And a sixth step of confirming that the call is in progress and ending the call connection, and attempting to connect a call when the strength is maximized to connect the call path.