KR20060114745A - A mobile communcation terminal for varying data transmission units in wireless data communication and transmission method thereby - Google Patents

Abstract

A mobile communication terminal for varying data transmission units during wireless data communication and a transmission method using the same are provided to set the transmission unit of data by detecting whether the strength of a received signal is a strong electric field mode or a week electric field mode, and to perform communication by varying the transmission unit of the data by using a result of cumulated statistical calculation of the sensed received signal only when the strong electric field or the week electric field is maintained within a predetermined reference time, thereby improving rate for transferring total data. A mobile communication terminal for varying data transmission units during wireless data communication comprises a data variable transmission unit(70) which determines an electric field mode according to a strength value of a received signal sensed at a controller(10) and sets the transmission unit of data transceived with a mobile communication system. The data variable transmission unit(70) determines whether change of the electric field mode is necessary through a cumulated statistical calculation process of the received signal strength value, and varies the transmission unit of the preset data.

Description

Variable mobile communication terminal for wireless data communication and transmission method using same {A MOBILE COMMUNCATION TERMINAL FOR VARYING DATA TRANSMISSION UNITS IN WIRELESS DATA COMMUNICATION AND TRANSMISSION METHOD THEREBY}

1 is a table showing the structure of a general TCP protocol.

Figure 2 is a block diagram showing the configuration of a data transmission unit variable mobile communication terminal in the present invention wireless data communication.

Figure 3 is a flow chart showing the operation of the transmission method using a data transmission unit variable mobile communication terminal in the present invention wireless data communication.

*** Description of the symbols for the main parts of the drawings ***

10: control unit 20: RF transceiver

30: operation unit 40: display unit

50: voice processing unit 60: memory unit

70 variable data transmission unit 71 mode detection unit

72: transmission unit setting unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal, and in particular, when performing wireless data communication such as Transmission Control Protocol (TCP) / IP (Internet Protocol) using a mobile communication terminal, reception from a base station synchronized with the mobile communication system side. After detecting the strength of the signal and setting the transmission unit of the data as a result of detecting whether it is a strong electric field mode or a weak electric field mode, the corresponding weak electric field or By varying the transmission unit of the data only when the strong electric field is maintained for a predetermined reference time, communication is performed so that the strength of the received signal that is instantaneously changed in the process of transmitting and receiving data in the transmission unit set according to the strength of the received signal detected from the base station Will not respond immediately to, such as areas where the base station's service area overlaps. When lower retransmission rate due to changes in frequent data transfer unit from a change in electric field mode severe radio environment there for a whole improves the data transmission speed wireless data communications relates to a transmission method using a terminal and this data transfer unit variable-mobile communication.

In general, the TCP protocol used for Transmission Control Protocol (TCP) / IP (Internet Protocol) -based communication has a characteristic that a large file of any length can be transmitted because the size of data that can be sent in one command is not limited. .

As shown in the TCP protocol structure of FIG. 1, the TCP protocol data is transmitted in a window size (byte unit) for flow control, and at this time, the receiving side determines the window field according to its data processing capability and network environment. By changing the value, you can control the flow.

Meanwhile, in case of performing TCP / IP-based wireless data communication through the mobile terminal, the window size of the TCP protocol is set according to the protocol revision level of the mobile communication system and does not change. It is a fixed value.

As a result, when the received radio wave strength is weak due to the distance between the mobile communication terminal and the base station, the waiting condition, and other deterioration of the wireless environment, that is, when the mobile communication terminal is in the weak electric field state, it causes a large data transmission loss and causes a retransmission rate. As a result, the data transfer speed is significantly reduced.

In order to overcome this problem, the transmission unit of the TCP protocol data is changed according to the radio wave strength sensed by the mobile communication terminal, so that when the mobile communication terminal is in a weak electric field, data of a smaller size in a strong electric field state is generated. There is a method to improve the data transmission speed by lowering the retransmission rate by transmitting, but even in this case, the overall data transmission efficiency decreases due to frequent window size change in the boundary region between weak and strong electric fields. There was a problem that could occur.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems. When performing wireless data communication such as Transmission Control Protocol (TCP) / IP (Internet Protocol) using a mobile communication terminal, the mobile communication system side A result of calculating the intensity of the received signal after setting the transmission unit of the data as a result of detecting the strength of the received signal from the base station synchronized with It is an object of the present invention to provide a mobile communication terminal and a transmission method using the same by varying a transmission unit of data only when the weak electric field or the strong electric field is maintained for a predetermined reference time.

In order to achieve the above object, the present invention provides a wireless data communication including a base station on a mobile communication system side and an RF transceiver for receiving a received signal, and a controller for sensing the strength of the received signal received through the RF transceiver. In a possible mobile communication terminal, the electric field mode is determined according to the strength value of the received signal detected by the controller to set a transmission unit of data transmitted and received with the mobile communication system side, and the cumulative statistical calculation of the received signal strength value is performed. And a data variable transmission unit configured to determine whether a change in the electric field mode is necessary and to vary the transmission unit of the set data.

In addition, the present invention comprises the steps of determining the electric field mode by sensing the strength of the received signal received from the mobile communication system when performing data communication; Transmitting and receiving data to and from the mobile communication system in a transmission unit corresponding to the determined electric field mode; And determining whether a mode change is necessary through a cumulative statistical calculation of strength values of a received signal while transmitting and receiving data in the transmission unit, and varying the transmission unit of the data.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing a configuration of a data transmission unit variable mobile communication terminal in a wireless data communication according to the present invention. As shown therein, a control unit (for example, a mobile station modem (MSM), etc.) 10, RF ( Radio Frequency) Variable data including a transceiver 20, an operation unit 30, a display unit 40, a voice processing unit 50, a display driver 60, a mode detector 71 and a transmission unit setting unit 72 It consists of the transmission part 70.

In addition, the operation of the transmission method using the variable data transmission unit of the mobile communication terminal in the wireless data communication for implementing the present invention, as shown in Figure 3, performing the wireless data communication using the mobile communication terminal, Detecting the strength of the received signal received from the mobile communication system to determine whether it is a weak electric field mode or a strong electric field mode, and transmitting and receiving data in a transmission unit corresponding to the determined electric field mode (S30 to S36); While the data is transmitted and received in the transmission unit, a cumulative statistical calculation of the strength value of the received signal received from the mobile communication system side determines whether a mode change is necessary, and accordingly the transmission unit of data transmitted and received with the mobile communication system side is determined. It consists of variable steps S37-S39.

Through the above configuration, the present invention, when performing a wireless data communication such as TCP (Transmission Control Protocol) / IP (Internet Protocol) using a mobile communication terminal, the received signal from the base station synchronized with the mobile communication system side After setting the transmission unit of the data as a result of detecting the strength of the strong electric field mode or the weak electric field mode by detecting the intensity of the signal, and using the result of the cumulative statistical calculation of the intensity of the detected received signal Only when the system is maintained within a predetermined reference time, the data is transmitted by varying the transmission unit of the data, and thus the instantaneous change in the strength of the received signal in the process of transmitting and receiving data in the transmission unit set according to the strength of the received signal detected from the base station. It does not react immediately, so the electric field like the area where the base station's service area overlaps In a wireless environment with severe mode changes, the retransmission rate due to frequent data transmission unit changes can be lowered, thereby improving the overall data transmission speed.

On the other hand, the mobile communication terminal configured as shown in Figure 2, the control unit (for example, MSM (Mobile Station Modem, etc.)) 10 is responsible for the overall control of the mobile communication terminal, such as voice call, data communication, RF transceiver unit 20 The RF signal receiving unit 20 detects the strength of the received signal, and the RF transceiver 20 performs a band conversion, modulation and demodulation, amplification, parsing, and the like of the radio signal to the mobile communication system. Transmit and receive radio signals with the base station.

The operation unit 30 receives various commands from a user through a keypad, and the display unit 40 displays various processing results through a liquid crystal display (LCD), and the voice processing unit 50 is a speaker. The audio codec is an audio codec for processing a voice signal output from a microphone or a voice signal input from a microphone, and the memory unit 60 is formed of an inactive memory and stores an operation program, various application programs, and various data generated by a user. .

In addition, the data variable transmitter 70 detects the strength of the received signal received from the base station synchronized with the mobile communication system when the mobile communication terminal performs wireless data communication such as TCP / IP communication. The controller detects whether the current electric field mode is the strong electric field mode or the weak electric field mode according to a predetermined reference value, and varies the transmission unit of data according to the detected electric field mode and outputs the data to the controller 10. It improves the transmission speed.

That is, when a user connects to a wireless data service using a mobile communication terminal and requests transmission and reception of data, the wireless data service is started, and the mode detector 71 of the data variable transmission unit 70 controls the mobile communication system in the control unit 10. Receives the strength value of the received signal received from the base station on the side, compares the strength value of the received signal according to a predetermined reference value and whether the electric field mode according to the current received signal strength is a strong electric field mode or a weak electric field mode Detect. Here, the control unit 10 detects the three (receive sensitivity) of the received signal from the pilot channel (Pilot Channel) signal of the forward link received through the RF transceiver 20.

The window field of the TCP protocol structure shown in FIG. 1 indicates the size of TCP protocol data in bytes that can be sent at one time. When the electric field mode detected by the mode detector 71 is a strong electric field mode, the present invention Sets the window field to a transmission unit corresponding to the strong electric field mode, which is the default setting, through the transmission unit setting unit 72, and sets the window field to the weak electric field mode in the weak electric field mode. The transmission unit corresponding to each electric field mode is set to a specific value according to the performance of the mobile communication terminal and the mobile communication system, the wireless environment, and the like.

At this time, when the electric field mode detected by the mode detector 71 is the weak electric field mode, the window field indicating the transmission unit is set to be relatively smaller than that in the strong electric field mode so that the wireless environment is not good, and thus, When the strength of the received signal is weak, the data transmission speed decrease caused by the increase in the retransmission rate caused by the data transmission loss occurs.

The transmission unit setting unit 72 initially sets a transmission unit of data according to the mode detected by the mode detection unit 71 and outputs the data to the control unit 10. The cumulative statistical calculation of the strength of the current received signal continuously transmitted from the control unit 10 compares whether the current cumulative received signal strength determined by the cumulative statistical operation satisfies a predetermined reference value, and is it necessary to change the electric field mode? By determining whether or not to change the electric field mode, the electric field mode is changed and the transmission unit of data is changed only when the previous electric field mode is maintained within a predetermined reference time, and the control unit 10 transmits the setting. Data communication is performed by adjusting the data size according to the unit.

Referring to the operation of varying the transmission unit of the data in the transmission unit setting unit 72, first, the intensity of the first received signal received from the control unit 10 in the mode detection unit 71 is referred to as the current received signal strength (dBm). Then, the first window size of the data according to the TCP protocol structure of FIG. 1 is determined by the current received signal strength, wherein the relationship between the received signal strength and the corresponding window size is determined by the performance of the mobile terminal and the mobile communication system. , An appropriate value is set depending on the wireless environment.

The received signal strength is updated every 80 ms by the pilot channel signal of the forward link received from the base station for the functionality of the RF transceiver 20. The transmission unit setting unit 72 performs the following equation for each updated time point. After calculating the cumulative received signal strength using 1, the cumulative received signal strength is compared with the calculated received signal strength at a value equal to a predetermined reference value used by the mode detector 71 for the detection of the electric field mode. It is determined whether it is necessary to change the electric field mode to the strong electric field mode or the weak electric field mode, and the transmission unit of data is set by the change of the electric field mode according to the determination and outputted to the control unit 10.

Accordingly, the controller 10 transmits / receives data in a transmission unit recorded in the window field by referring to a window field value set by the transmission unit setting unit 72. To control.

Current cumulative received signal strength (dBm) = Previous cumulative received signal strength (dBm) × 0.9 + Current received signal strength (dBm) × 0.1

Here, the previous cumulative received signal strength is a value obtained by cumulatively calculating the strength value of the received signal detected until the previous time, and the current received signal strength is a strength value of the currently detected received signal.

Therefore, the transmission unit setting unit 72 changes the window size whenever the intensity of the received signal in the boundary region between the strong and weak electric fields changes rapidly in the fast time (80 ms) through Equation 1, thereby controlling the window size. In order to prevent an excessive load on (10), according to the present invention, it takes at least 0.8 seconds to take the time required to change from a strong electric field to a weak electric field or from a weak electric field to a strong electric field, that is, a predetermined reference time at which the previous electric field mode is maintained. Adjust

In this case, the transmission unit setting unit 72 adjusts a constant (for example, 0.9 or 0.1) that is multiplied by the previous cumulative received signal strength of Equation 1 and the current received signal strength to detect the electric field mode immediately before. Is adjusted, or the period for transmitting the received signal strength value from the control unit 10 to the mode detection unit 71 is adjusted to perform the cumulative statistical calculation according to Equation 1 in the transmission unit setting unit 72. As a result, it is possible to adjust the time for which the previous electric field mode is maintained as a result.

Meanwhile, referring to FIG. 3, a transmission method using a variable data transmission unit in a wireless data communication according to the present invention will be described.

When a user connects to a wireless data service using a mobile communication terminal to request data transmission and reception and initiates wireless data communication, when the user performs wireless data communication using the mobile communication terminal, the reception is received from the mobile communication system at the mobile communication terminal. By sensing the strength of the signal, it is determined whether the electric field mode based on the current received signal strength is a weak electric field mode or a strong electric field mode, and transmits and receives data in a transmission unit corresponding to the determined electric field mode (S30 to S36).

That is, after the wireless data communication is started, the RF transceiver 20 of the mobile communication terminal receives the received signal from the base station of the mobile communication system according to the request for initiating the wireless data communication, and the control unit 10 receives the RF transceiver The strength of the received signal (receive sensitivity) is detected from the pilot channel signal of the forward link received through the 20, and transmitted to the data variable transmitter 70 with the current received signal strength (S30).

Then, the mode detection unit 71 of the data variable transmission unit 70 compares the current received signal strength according to a predetermined reference value to determine whether the electric field mode based on the current received signal strength is a strong electric field mode or a weak electric field mode. (S31), the transmission unit setting unit 72 stores the current received signal strength (S32).

In this case, when the electric field mode detected by the mode detecting unit 71 is the weak electric field mode by the step S31, the size of the TCP protocol data in bytes can be transmitted at one time, that is, a window field indicating a transmission unit. In the case of the strong electric field mode, the window field is set to the transmission unit corresponding to the strong electric field mode, which is a basic setting, to the controller 10. By outputting (S35), the control unit 10 controls the RF transceiver 20 to transmit and receive data in the transmission unit recorded in the Window field by referring to the set Window field value (S36). ). Here, the transmission unit corresponding to each electric field mode is set to a specific value according to the performance of the mobile communication terminal and the mobile communication system, the wireless environment, and the like.

In the present invention, the cumulative statistics according to Equation 1 described above is the intensity value of the received signal received from the mobile communication system side in the transmission unit setting unit 72 while transmitting and receiving data in the transmission unit according to each electric field mode. In operation S37, it is determined whether the electric field mode needs to be changed by comparing whether the current cumulative received signal strength determined by the cumulative statistical operation satisfies a predetermined reference value (S38).

Only when it is observed that the electric field mode immediately detected by the mode detection unit 71 is maintained for a predetermined reference time according to Equation 1 described above, the transmission unit of data according to the current electric field mode is maintained (S39), Returning to the previous step S31, the transfer unit of data is varied.

Here, in step S37, the transmission unit setting unit 72 uses a predetermined reference value used by the mode detection unit 71 to determine whether the electric field mode based on the current received signal strength is a strong electric field mode or a weak electric field mode. Will be used as is.

In addition, the electric field detected by the transmission unit setting unit 72 adjusts a constant (for example, 0.9 or 0.1) that is multiplied by the value of the previous cumulative received signal strength and the current received signal strength of Equation 1 described above. The cumulative statistical calculation according to Equation 1 is performed by the transmission unit setting unit 72 by adjusting the time for which the mode is maintained or by adjusting the period for transmitting the received signal strength value from the control unit 10 to the mode detection unit 71. As a result, the time when the previous electric field mode is maintained is controlled by changing the time to be performed, and the time during which the electric field mode detected immediately before is maintained is adjusted. In spite of the electric field change to the weak electric field, the previous electric field mode is maintained for a certain time to enable stable data transmission and reception without degrading the data transmission speed. .

As described above, the present invention, when performing a wireless data communication such as TCP (Transmission Control Protocol) / IP (Internet Protocol) using a mobile communication terminal, the received signal from the base station synchronized with the mobile communication system side After detecting the strength and setting the transmission unit of the data as a result of detecting whether it is the strong field mode or the weak field mode, the corresponding weak field or the strong field field is calculated by using the result of the cumulative statistical calculation of the detected intensity of the received signal. By performing communication by varying the transmission unit of data only when it is maintained within a predetermined reference time, it is instantaneous to the strength of the instantaneously changing received signal in the process of transmitting and receiving data in the transmission unit set according to the strength of the received signal detected from the base station. The electric field, such as an area where the service area of the base station overlaps, In the wireless environment with a severe mode change, the retransmission rate due to frequent data transmission unit changes can be lowered, thereby improving the overall data transmission speed.

Claims (6)

A mobile communication terminal capable of wireless data communication, comprising: a base transceiver station on a mobile communication system side and an RF transceiver for receiving a received signal; and a controller for sensing the strength of a received signal received through the RF transceiver; Determining the electric field mode according to the received signal strength value to set the transmission unit of the data transmitted and received with the mobile communication system side, and determine whether or not to change the electric field mode through the cumulative statistical calculation of the received signal strength value A variable data transmission unit for wireless data communication, characterized in that it comprises a variable transmission unit for varying the transmission unit of the set data. The method of claim 1, wherein the data variable transmission unit receives the intensity value of the received signal detected by the control unit and detects whether the electric field mode based on the current received signal strength is a strong electric field mode or a weak electric field mode according to a predetermined reference value. A mode detection unit; According to the electric field mode detected by the mode detector, a transmission unit of data is set and outputted to the controller, and cumulative statistical calculation is performed on the intensity value of the received signal transmitted from the controller while performing communication in the transmission unit of the set data. By using the result, it is determined whether the electric field mode needs to be changed. If the previous electric field mode is maintained for a predetermined reference time or longer, the current electric field mode is maintained. Otherwise, the electric field mode is changed. And a transmission unit setting unit for varying a transmission unit of the data transmission unit in a wireless data communication. The method of claim 2, wherein the transmission unit setting unit calculates the current cumulative received signal strength according to Equation 2 below, and compares it with a predetermined reference value to determine whether the weak electric field mode or the strong electric field mode to change the electric field mode A variable data communication unit for data transmission unit in wireless data communication, characterized in that it is determined whether there is a need. Current cumulative received signal strength (dBm) = Previous cumulative received signal strength (dBm) × 0.9 + Current received signal strength (dBm) × 0.1 Here, the previous cumulative received signal strength is a value calculated by cumulatively calculating the strength of the received signal detected until the previous time, and the current received signal strength is the strength of the currently detected received signal. 4. The method of claim 3, wherein the transmission unit setting unit adjusts a period in which the control unit transmits the intensity value of the received signal to the mode detection unit, or is a constant multiplied by a value of the previous cumulative received signal strength and the current received signal strength in Equation (2). And adjusting the time for which the previous electric field mode is maintained, wherein the data transmission unit variable mobile communication terminal during wireless data communication. Determining the electric field mode by sensing the strength of a received signal received from the mobile communication system when performing data communication; Transmitting and receiving data to and from the mobile communication system in a transmission unit corresponding to the determined electric field mode; Varying the transmission unit of data during wireless data communication, determining whether a mode change is necessary through a cumulative statistical calculation of strength values of a received signal while transmitting and receiving data in the transmission unit. Transmission method using a mobile communication terminal. The method of claim 5, wherein the step of varying the transmission unit of the data by determining whether to change the mode through the cumulative statistical calculation of the strength value of the received signal while transmitting and receiving data in the transmission unit, the reception received from the mobile communication system side Determining a current cumulative received signal strength by performing a cumulative statistical operation on the signal strength value according to Equation 3 below; And determining whether the electric field mode needs to be changed by comparing the determined current cumulative received signal strength with a predetermined reference value. Current cumulative received signal strength (dBm) = Previous cumulative received signal strength (dBm) × 0.9 + Current received signal strength (dBm) × 0.1 Here, the previous cumulative received signal strength is a value calculated by cumulatively calculating the strength of the received signal detected until the previous time, and the current received signal strength is the strength of the currently detected received signal.

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