KR100861015B1 - Apparatus and method for locking communication mode in mobile communication system - Google Patents

Abstract

The present invention relates to fixing a communication mode, the method of fixing a data communication mode of a portable terminal, the process of checking whether a connection is performed for a data service in a first communication mode with a serving cell, and data service in the first communication mode. When performing the connection for, the process of setting the signal reception value and the signal quality value of the other cells other than the serving cell to the minimum, after the minimum setting process, providing a data service, and In the data service providing process, if the signal reception value or the signal quality value of the serving cell is greater than a threshold, maintaining the data service connection of the first communication mode with the serving cell. When performing data communication where GPRS cells overlap, prevent frequent handover between EDGE cells and GPRS cells and The fixed use of the data communication mode in the communication mode has the advantage of providing a higher performance data service.

Mobile communication system. Enhanced Data rates for GSM Evolution (EDGE), General Packet Radio Service (GPRS).

Description

Apparatus and method for fixing communication mode in mobile communication system {APPARATUS AND METHOD FOR LOCKING COMMUNICATION MODE IN MOBILE COMMUNICATION SYSTEM}

1 is a diagram showing the configuration of a mobile communication system according to an embodiment of the present invention;

2 is a flowchart illustrating a process of fixing a communication mode of a portable terminal according to an embodiment of the present invention;

3 is a block diagram of a portable terminal according to an embodiment of the present invention.

The present invention relates to a fixed communication mode, in particular, when a mobile terminal uses an enhanced data rate for GSM evolution (EDGE) communication mode in a specific cell of a mobile communication system, communication in a general packet radio service (GPRS) communication mode. The present invention relates to a device and a method for preventing a mode change and fixing the EDGE communication mode.

In an area where EDGE (also referred to as EGPRS) and GPRS cells overlap, a user can use a circuit switched voice service and a packet switched data service. In the overlapped area, the circuit-switched voice service has no difference in support between the EDGE cell and the GPRS cell, but the data service may provide a superior service of the EDGE cell at a higher speed.

Channel Coding Scheme RLC data block size without spare bits (N2) (octets) Number of spare bits RLC data block size (octets) CS-1 22 0 22 CS-2 32 7 32 7/8 CS-3 38 3 38 3/8 CS-4 52 7 52 3/8

Table 1 shows a coding scheme of GPRS, and a scheme using only a Gaussian Minimum Shift Keying (GMSK) method exists only from 1 to 4.

Channel Coding Scheme EDGE RLC data unit size (N2) (octets) Family MSC-1 22 C MSC-2 28 B MSC-3 37 A MSC-4 44 C MSC-5 56 B MSC-6 74 A MSC-7 2 x 56 B MSC-8 2 x 68 A MSC-9 2 x 74 A

Table 2 shows a coding scheme of EDGE, and there are not only GMSK but also coding schemes using 8PSK (8 Phase Shift Keying) up to 1-9. This is because a difference in the size of the transmitting RLC data unit occurs. In addition, since the window size is 64 for GPRS and 64 to 1024 for EDGE, EDGE also has an efficient mechanism for packet transmission.

Due to the above characteristics, EDGE's data throughput is up to three times higher than that of GPRS. EDGE can support a maximum data rate of 384 kbps in data mode and GPRS can support data rates of up to 128 kbps.

In the area where EDGE and GPRS cells overlap, EDGE and GPRS can experience up to three times the difference in throughput when using data services. You can get it.

However, as the user moves or for other reasons, when using the GPRS communication mode even in an environment in which the user can use the EDGE communication mode above a certain threshold, there is a problem that a low performance data service is provided.

Accordingly, there is a need for an apparatus and method for preventing a data communication mode from being changed to a GPRS communication mode in an environment where a user may use an EDGE communication mode above a certain threshold.

An object of the present invention is to provide an apparatus and method for fixing a communication mode in a mobile communication system.

Another object of the present invention is to provide an apparatus and a method capable of fixing the use of an EDGE communication mode without changing the communication mode to the GPRS communication mode in an environment where an EDGE communication mode above a certain threshold is available.

Another object of the present invention is to provide an apparatus and method for providing a data service supporting maximum performance of an EDGE by fixing the use of an EDGE communication mode in an environment in which an EDGE communication mode above a certain threshold is available.

According to a first aspect of the present invention for achieving the above object, in the method of fixing a data communication mode of a portable terminal, a process of checking whether a connection is performed for a data service in a first communication mode with a serving cell; When a connection for data service is performed in a communication mode, a process of setting signal reception values of other cells except the serving cell and signal quality values of the other cells to a minimum, and after the minimum setting process, provide a data service. And maintaining the data service connection of the first communication mode with the serving cell when the signal reception value or the signal quality value of the serving cell is greater than a threshold value. Characterized in that.

According to a second aspect of the present invention for achieving the above object, an apparatus of a portable terminal capable of fixing a data communication mode, the interface module for providing a wireless communication function with another node, and the first through the interface module When the data service connection is performed in the communication mode, the signal reception value and the signal quality value of the cells other than the serving cell are set to the minimum to provide the data service, and the signal reception value of the serving cell or If the signal quality value is greater than the threshold, characterized in that it comprises a data communication management unit for maintaining a data service connection of the first communication mode with the serving cell.

According to a third aspect of the present invention for achieving the above object, in a mobile communication system capable of fixing a data communication mode, providing a data service in a first communication mode or a second communication mode is a plurality of base stations and the base stations When the data service is connected to a specific base station in the first communication mode, the signal reception value and the signal quality value of other base stations except the serving base station are set to the minimum to provide the data service and the serving base station in the data service providing process. And a portable terminal for maintaining a data service connection of the first communication mode with the serving base station when the signal reception value or the signal quality value of the signal is greater than a threshold.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that the specific description of the related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, an apparatus and method for fixing a communication mode in a mobile communication system will be described.

1 is a diagram illustrating a configuration of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 1, in a mobile communication system according to an embodiment of the present invention, the mobile terminal 130 is a user in an area where the cells 110 and 122 supporting the EDGE and the GPRS are overlapped with the GPRS cell 120. Provide data services to

2 is a flowchart illustrating a process of fixing a communication mode of a portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the portable terminal camps in an EDGE cell (step 210), is instructed to use a data service from a user, and performs a process of activating a "PDP Context" to prepare for receiving a data service from a network. The EDGE cell is a serving cell of the portable terminal.

In this case, the portable terminal sets the "PDP Context" activation counter P. P indicates that the "PDP Context" activation process necessary for the portable terminal to receive the data service is performed. The initial value of P is "0".

The portable terminal also sets an EDGE serving cell parameter (T). T indicates that the portable terminal is currently camping in an EDGE cell. The initial value of T is "0".

The portable terminal can determine whether the current cell supports EDGE through a GPRS CELL OPTION Information Element of system information broadcast from a network.

Then, when T = 1 and P = 1 at the same time (step 220), that is, when the portable terminal uses the EDGE mode data service, the EDGE cell fixing algorithm of the present invention is performed (step 240). That is, the algorithm starts using the EDGE communication mode and uses the data service without changing the communication mode to the GPRS communication mode (step 250).

Thereafter, the portable terminal periodically sets the signal measurement value RxLev of the other cells except the EDGE cell, which is a serving cell, to -110 dBm. This is to prevent a context change between cells in order to fix a serving cell with the EDGE serving cell.

However, if the signal measurement value (RxLev) of the EDGE serving cell represents -95 dBm or the signal quality value (RxQual) represents 6 or 7 (that is, worse than a threshold for maintaining the EDGE cell fixation algorithm). (Step 260), the execution of the EDGE cell fixing algorithm is stopped (step 280). This is to prevent the reception signal value or the reception quality value degradation from causing a call drop or a high bit error rate (BER).

After the stopping process, the portable terminal can handover to a cell supporting the EDGE communication mode and the GPRS communication mode at the same time or to a cell supporting only the GPRS.

If the signal measurement value RxLev of the EDGE serving cell is greater than -95 dBm or the signal quality value RxQual is greater than 6 or 7 (that is, better than the threshold) (step 260), Maintain the EDGE cell lock algorithm (step 270). This process is repeated until the data communication is completed.

If the condition that T = 1 and P = 1 at the same time is not satisfied (step 220), that is, when not camping in the EDGE cell or using the EDGE mode data service, the existing algorithm is not used without the present invention. Follow the method of step 230.

 Then, the algorithm according to the present invention is terminated.

3 is a block diagram of a portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the interface module 310 is a module for receiving data or control messages transmitted from other nodes and includes a radio frequency (RF) processor and a baseband processor. The RF processor converts a signal received through an antenna into a baseband signal and provides the signal to the baseband processor.

The controller 320 controls the overall operation of the portable terminal, and in particular, controls the data communication manager 340 according to the present invention to perform data communication in the EDGE communication mode.

The data communication management unit 340 performs data communication in the EDGE communication mode when the communication environment with the serving cell does not fall below a threshold value by the instruction and the provision information of the control unit 320.

The storage unit 330 stores a program for controlling the overall operation of the apparatus and temporary data generated during program execution.

In the above block configuration, the controller 320 may perform a function of the data communication manager 340. In the present invention, it is shown to configure them separately to explain each function separately. Therefore, when the product is actually implemented, all of the functions of the data communication manager 340 may be configured to be processed by the controller 320, and only some of the functions may be configured to be processed by the controller 320.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention prevents frequent handover between EDGE cell and GPRS cell when performing EDGE cell and GPRS cell overlap, and fixes the data communication mode in EDGE communication mode for higher performance data. There is an advantage in providing a service.

Claims (15)

In the data communication mode fixing method of a portable terminal, Checking whether the serving cell is connected to the data service in an enhanced data rate for GSM evolution (EDGE) communication mode; Setting a signal reception value of another cell except for the serving cell and a signal quality value of the other cell when the connection for data service is performed in the EDGE communication mode; After the minimum setting process, providing a data service; In the data service providing process, maintaining a data service connection of the EDGE communication mode with the serving cell when the signal reception value or the signal quality value of the serving cell is greater than a threshold value. Way. The method of claim 1, Searching for another cell capable of connecting to a data service in the EDGE communication mode when the signal reception value or the signal quality value of the serving cell is less than a threshold value in the data service providing process; If there is another cell capable of data service connection in the EDGE communication mode, handing over to another cell capable of data service connection in the EDGE communication mode. The method of claim 2, If there is no other cell capable of data service connection in the EDGE communication mode, handing over to another cell capable of data service connection in a general packet radio service (GPRS) communication mode. delete delete A device of a portable terminal capable of fixing a data communication mode, An interface module for providing a wireless communication function with another node, In case of performing data service connection in EDGE communication mode through the interface module, data service is provided by setting signal reception value and signal quality value of other cells except the serving cell to the minimum, and the serving cell in the data service provision process. And a data communication manager for maintaining a data service connection in the EDGE communication mode with the serving cell when the signal reception value or the signal quality value of the signal is greater than a threshold. The method of claim 6, When the signal reception value or the signal quality value of the serving cell is less than a threshold value, the data communication management unit searches for another cell that can be connected to the data service in the EDGE communication mode and the EDGE communication mode. And when there is another cell capable of data service connection, handover to another cell capable of data service connection in the EDGE communication mode. The method of claim 6, When the signal reception value or the signal quality value of the serving cell is less than a threshold value, the data communication management unit searches for another cell that can be connected to the data service in the EDGE communication mode and the EDGE communication mode. And when there is no other cell capable of data service connection, handover to another cell capable of data service connection in the GPRS communication mode. delete delete In the mobile communication system capable of fixing the data communication mode, A plurality of base stations capable of providing data service in an EDGE communication mode or a GPRS communication mode; When a data service connection is performed with a specific base station among the base stations in an EDGE communication mode, signal reception and signal quality values of other base stations other than the serving base station are set to minimum to provide a data service. And a portable terminal for maintaining a data service connection of the EDGE communication mode with the serving base station when the signal reception value or the signal quality value of the serving base station is greater than a threshold. The method of claim 11, The portable terminal searches for another base station capable of connecting a data service in the EDGE communication mode when the signal reception value or the signal quality value of the serving base station is less than a threshold value during the data service providing process and performs data in the EDGE communication mode. And if there is another base station capable of service connection, handover to another base station capable of data service connection in the EDGE communication mode. The method of claim 11, The portable terminal searches for another base station capable of connecting a data service in the EDGE communication mode when the signal reception value or the signal quality value of the serving base station is less than a threshold value during the data service providing process and performs data in the EDGE communication mode. And when there is no other base station capable of service connection, handover to another base station capable of data service connection in the GPRS communication mode. delete delete

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