KR20000031129A - Grouping and ungrouping method of sector-cell using divider in cellular mobile telecommunication system - Google Patents

Abstract

PURPOSE: A grouping and ungrouping method of sector-cell using divider in cellular mobile telecommunication system is provided to group plural sector-cells into single omni-cell and ungroup the single omni-cell into plural sector-cells. CONSTITUTION: A grouping and ungrouping method of sector-cell using divider in cellular mobile telecommunication system comprises steps of: selecting a first sector-cell using the divider; transmitting the first pilot signal of the selected first sector-cell; sensing the first pilot signal by a mobile phone; assigning a traffic channel corresponding to the reference pilot signal to a mobile phone; communicating with a base station; decreasing the strength of a first pilot signal transferred through the transmitter/receiver and the relay station; sensing the decrease of the first pilot signal; sustaining only a channel corresponding to the reference pilot signal; and communicating with the base station.

Description

Sector-Cell Grouping and Ungrouping Method Using Splitter in Cellular System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular mobile telecommunication system. In particular, a base station having a sector-cell structure further includes a splitter for connecting a signal of one sector-cell to another sector-cell. Next, the splitter in a cellular system is used to group multiple sector-cells into one omni-cell and ungroup the omni-cells into the original sector-cell using the splitter. The present invention relates to a method of grouping and ungrouping sector-cells used.

The cellular mobile communication system divides the entire service area into a plurality of base station areas and constitutes cells, which are small service areas, and centrally controls these base stations to the mobile switching center so that subscribers can continue communication while moving between cells. Make sure In cellular systems, a handoff function allows a call to continue when the mobile phone leaves the area of one base station and enters the area of another base station.

1 illustrates a schematic diagram of a cellular system using Code Division Multiple Access (CDMA) technology. As shown, a base station transceiver subsystem (BTS) 20, 30, 40 that provides a mobile communication service to a mobile telephone (MT) 10, and a plurality of base stations are public switched telephones. It consists of a Mobile Switching Center (MSC) 50 that connects to a Public Switched Telephone Network (PSTN) 60.

Cellular mobile communication systems improve the efficiency of use of scarce frequencies, allowing more users to use them. The concept introduced to further increase the frequency efficiency is a cell division technique, and one of such cell division techniques is sectorization. The sector-cell divides the cell into three parts by spacing the 120 degree antenna to the left and right, and the mobile phone recognizes one sector antenna as one base station.

Sector-cellular systems can divide the same area into more areas (sector-cells), so that sector-cellular systems can increase frequency capacity compared to conventional cellular systems, but instead increase the handoff between sector-cells From this point of view, a lot of unnecessary call processing occurs.

The base station must perform a stable handoff so that the call of the mobile telephone traveling between sectors-cells is not disconnected. The mobile phone uses a pilot signal to recognize that it has entered another sector-cell. The pilot signal is an identification signal for distinguishing different service areas in a cellular system.

Handoff requires a lot of work, which places a heavy load on the base station. Furthermore, even when operating a base station designed with a sector-cell structure to increase frequency utilization efficiency, even if the number of subscribers is reduced and no cell division is required, the base station remains a sector-cell structure. Sector-cell handoffs frequently occur.

In the prior art operating as described above, a lot of unnecessary handoffs occur when the mobile phone moves between divided sector-cells, and this handoff causes call breakage or overload of the base station, which degrades the call quality. There was a problem of reducing the efficiency of the system.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to mount a splitter in a base station having a sector-cell structure and use a plurality of sectors by using the splitter. To provide a method for grouping and ungrouping sector-cells using a divider in a cellular system, grouping cells into one omni-cell and ungrouping omni-cells into multiple sector-cells It is done.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1 is a schematic diagram of a cellular system employing code division multiple access (CDMA) technology.

2 is an embodiment of a sector-cellular system configuration to which the present invention is applied.

3 is an embodiment of a sector-cell base station configuration using a divider in accordance with the present invention;

Figure 4 is an embodiment of the connection between the sector interface unit and the distributor and transceiver according to the present invention.

Figure 5 is an embodiment of the internal configuration of the dispenser according to the present invention.

6 is a flowchart illustrating a method of grouping sector-cells in accordance with the present invention.

7 is a flowchart illustrating a method for ungrouping sector-cells according to the present invention.

<Explanation of symbols for main parts of the drawings>

10: mobile phone 20, 30, 40: base station

50: mobile switching center 60: public switched telephone network

110,130,150: Sector 120,140,160: Sector-antenna

202,204,206,208: Channel Card

212,214,216: Channel Combination and D / A Converter

220: sector interface unit 230,232,234,236: distributor

242,244,246 Transceiver 1,2 Internal path of distributor

3,4: Switch for switching

A preferred embodiment of the method of grouping and ungrouping sector-cells using a divider in the cellular system according to the present invention, which is designed to achieve the above object, consists of a plurality of sector-cells each having a unique pilot signal. A cellular system comprising a base station providing a mobile communication service to a mobile telephone in a sector-cell,

A base station connecting a divider between a transceiver and a sector interface for all sector-cells, and using the divider to select a sector-cell (first sector-cell) as a reference for grouping;

Transmitting, by the base station, the pilot signal (first pilot signal) of the selected first sector-cell through the transceiver and the sector-antenna of the sector-cell (second sector-cell) to be grouped;

A mobile telephone sensing a pilot signal (second pilot signal) of a second sector-cell transmitted through a transceiver of a second sector-cell and a sector-antenna is connected via a transceiver and a sector-antenna of a second sector-cell. Newly sensing the first pilot signal transmitted and reporting the detection of the first pilot signal to the base station;

Allocating a traffic channel corresponding to the first pilot signal to the mobile phone by the base station that has received the detection of the first pilot signal;

The mobile telephone recognizing the allocation of the traffic channel, connecting the channel simultaneously with the traffic channel corresponding to the second pilot signal and the traffic channel corresponding to the first pilot signal, and communicating with the base station through two channels;

A base station communicating with a mobile telephone over two channels, gradually decreasing the strength of a transceiver of a second sector-cell and a second pilot signal transmitted over a sector-antenna;

Detecting, by the mobile telephone communicating with the base station via the two channels, a decrease in the strength of the second pilot signal and reporting a change in strength of the pilot signal to the base station;

Receiving a change in the strength of the pilot signal by the base station, instructing the mobile phone to disconnect the traffic channel corresponding to the second pilot signal and to maintain only the traffic channel corresponding to the first pilot signal; And

The mobile telephone, instructed by the base station, disconnects the traffic channel corresponding to the second pilot signal and communicates with the base station using only the traffic channel corresponding to the first pilot signal.

A preferred embodiment of the method for ungrouping sector-cells using a divider in the cellular system according to the present invention, which was devised to achieve the above object, is a reference sector-cell (first sector-cell) sent out through the divider. A cellular system comprising a base station providing a mobile communication service to a mobile telephone in an omni-cell grouped using a first pilot signal of

Transmitting, by the base station, a unique pilot signal (second pilot signal) through a transceiver of the second sector-cell constituting the grouped omni-cell and a sector-antenna;

The mobile phone detecting the first pilot signal transmitted through the transceiver of the second sector-cell and the sector antenna has newly detected the second pilot signal transmitted through the transceiver of the second sector-cell and the sector antenna. Reporting the detection of the second pilot signal to the base station;

Allocating a traffic channel corresponding to the second pilot signal to the mobile phone by the base station, which has received the detection of the second pilot signal;

The mobile telephone recognizing the allocation of the traffic channel, connecting the channel simultaneously with the traffic channel corresponding to the first pilot signal and the traffic channel corresponding to the first pilot signal, and communicating with the base station through two channels;

A base station communicating with a mobile telephone over two channels, gradually decreasing the strength of a transceiver of a second sector-cell and a first pilot signal transmitted over a sector-antenna;

Detecting, by the mobile telephone communicating with the base station via the two channels, a decrease in the strength of the first pilot signal and reporting a change in the strength of the pilot signal to the base station;

Receiving a change in the strength of the pilot signal by the base station, instructing the mobile phone to disconnect the traffic channel corresponding to the first pilot signal and to maintain only the traffic channel corresponding to the second pilot signal; And

The mobile telephone commanded by the base station disconnects the traffic channel corresponding to the first pilot signal and communicates with the base station using only the traffic channel corresponding to the second pilot signal.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification. Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention.

The present invention provides a method in which a plurality of sector-cells separated by different pilot signals all have the same pilot signal. If multiple sector-cells all have the same pilot signal, the mobile phone recognizes the sector-cells with the same pilot signal as one omni-cell. Therefore, even if the mobile phone moves between grouped sector-cells (in an omni-cell), no handoff occurs, and the mobile phone can be provided with a stable communication service like a mobile phone moving in one cell.

In a system using code division multiple access technology, each sector-cell is distinguished from each other by using a time offset (PN offset) of a unique pseudo noise (PN) code, so that a base station transmits a pilot signal to a mobile phone. Send information about PN offset in. The mobile phone can analyze the sensed pilot signal to determine which sector-cell it is located in and request a handoff.

In order to ensure that multiple sector-cells with unique PN offsets all have the same PN offset, the present invention utilizes a divider. Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention.

2 is a block diagram of a sector-cellular system to which the present invention is applied. As shown in FIG. 2, the base station 20 has a beam width of 120 and three sector-antennas 120 and 140 spaced 120 by left and right. 160).

A base station using a technique using a code division multiple access technique spreads a signal transmitted from a mobile switching center by multiplying a long code and a Walsh code, and then distinguishes each sector-cell from the spread signal. Multiply by the unique pilot signal for the transmission through the transceiver to the corresponding sector-antenna. The channel card of the base station includes four, eight, or sixteen channel elements. Since each channel element has three paths, the channel card combines the output of each channel element for each path and delivers the signal to the antenna.

The base station of the sector-cellular structure combines three paths output from each channel card and delivers them to a plurality of sector antennas. Therefore, the present invention uses a splitter that combines the paths of the three signals output from each channel card of the base station, thereby changing the pilot signal (PN offset) of the other sector-cells based on the desired sector-cell. You can operate a cell as if it were a single cell.

Figure 3 illustrates one embodiment of a sector-cell base station configuration with a divider in accordance with the present invention.

As shown, first to sixth channel cards 202, 204, 206 and 208, which are composed of a channel controller and a modulator to generate in phase (I) and quadrature (Q) signals; First to third channel combinations and D / A converters (212) (214) (216) for combining signals transmitted from each channel card by I and Q channels, converting them into analog signals, and outputting the signals as sector signals; A sector interface unit 220 for generating a signal transmitted from the channel combination and the D / A converter as a signal for each sector, and a distributor 130 for connecting a path of the signal transmitted from the sector interface unit to a path of another sector-cell; First to third transceivers 242 for converting the sector-specific signals transmitted from the splitter into radio frequency signals (RF signals) and transmitting the signals to the sector-antennas 120, 140, and 160, respectively. 244, 246.

The distributor 230 is configured to connect a signal of one sector-cell to a transceiver of another sector-cell. FIG. 4 shows a sector interface unit 220, a distributor 230, and a transceiver 242 (in accordance with the present invention). 244) 246, as shown in detail, as shown, the sector interface unit 220 outputs three signals Txα, Txβ, and Txγ corresponding to three sector-cells. The Txα is divided into three signals Tx'α by the first distributor 232 and transmitted to the first transceiver 242, the second transceiver 244, and the third transceiver 246, respectively. Like Txα, Txβ and Txγ are delivered by the second or third distributors 234 and 236 to the first transceiver 242 to the third transceiver 246, respectively. Splitter 230 therefore allows the transceiver to receive signals of all sector-cells.

Since the distributor connects the sector interface unit and the transceiver, an abnormality in the internal path may have a fatal effect on the provision of the mobile communication service. Therefore, as shown in Fig. 5, the inside of the distributor 232 is duplexed into two paths (1) and (2), and if an abnormality occurs in one path, the switch (3) and (4) is used to switch to another path. This ensures that the normal path is always used.

A base station including a distributor configured as described above may connect a pilot signal generated in a channel card of one sector-cell to a transceiver of another sector-cell. Therefore, in order to group a plurality of sector-cells into one omni-cell by using a base station having the above-described configuration, a sector-cell as a reference for grouping is selected, and a pilot signal (PN offset) of another sector-cell is referred to. Convert to a sector-cell pilot signal. The conversion of the pilot signal may be performed by applying a transceiver for transmitting two pilot signals at the same time and a handoff method between the antenna and the sector-cell.

6 is a flowchart illustrating a method of grouping sector-cells according to the present invention. Hereinafter, a grouping method according to the present invention will be described with reference to FIG. 6.

First, a reference sector-cell, which is a reference for grouping, is selected. Herein, the operation of the present invention will be described using an embodiment of grouping a second sector-cell into a first sector-cell based on the first sector-cell. do. However, the reference sector-cell may be any sector-cell (α sector, β sector or γ sector) that can be serviced by one base station.

In step S110, the base station of the sector-cell structure mounts a divider for grouping the sector-cells, and selects a reference sector-cell (first sector-cell) on which the grouping is based. When a first sector-cell selected as a reference for grouping has a first pilot signal and another sector-cell to be grouped (second sector-cell) has a second pilot signal, in step s120, the base station The splitter transmits the pilot signal of the first sector-cell through the transceiver and the sector-antenna of the second sector-cell. Since the pilot signals all have different PN offsets, they can be distinguished from each other.

The first pilot signal is sent to the sector antennas of the sector-cells to be grouped through the transceivers of all sector-cells (e.g., the second sector-cell) to be grouped. At this time, the transceiver of the sector-cell to be grouped transmits only the signal for the sector-cell to be grouped and the signal for the reference sector-cell to the sector-antenna. That is, the second splitter connected to the transceiver of the second sector-cell blocks the signal of the other sector-cell and transfers only the signal of the first sector-cell, which is a reference for grouping with the signal of the second sector-cell, to the second transceiver. do. By the operation of the distributor as described above, the transceiver of the second sector-cell and the sector-antenna simultaneously transmit the first pilot signal and the second pilot signal.

Assuming that the mobile phone is communicating with the base station using the second pilot signal in the second sector-cell, in step s130, the mobile phone is transmitted through the sector-antenna of the second sector-cell. The pilot signal is newly detected and the base station reports that the new pilot signal has been detected.

In step s140, the base station, which has received the detection of the first pilot signal from the mobile phone, sets the idle channel to the traffic channel having the first pilot signal, assigns the set traffic channel to the mobile phone, and then sends the mobile phone to the mobile phone. Signals that a traffic channel has been allocated. Then, in step s150, the mobile phone connects the channel simultaneously with the traffic channel of the second pilot signal originally communicating with the traffic channel of the newly allocated first pilot signal, and communicates with the base station through the two channels.

In order to group the sector-cells, in step S160, the base station gradually decreases the strength of the second pilot signal transmitted through the transceiver and the sector-antenna of the second sector-cell. In step s170, the mobile telephone in the second sector-cell detects the decrease in the second pilot strength and reports the decrease in the pilot strength to the base station. If the strength of the second pilot signal detected by the mobile phone decreases below a certain level, in step S180, the base station disconnects the traffic channel of the second pilot signal to the mobile phone, and only the traffic channel of the first pilot signal. Command to keep

In step S190, the mobile phone receiving the command of the base station stops receiving the second pilot signal to disconnect the traffic channel of the second pilot signal, and communicates with the base station using only the traffic channel of the first pilot signal.

When the above process is repeated for each sector-cell to be grouped, the sector-cells of the base station having different pilot signals all have the same pilot signal (pilot signal of the reference sector-cell). That is, when the base station groups the second sector-cell into the first sector-cell and the third sector-cell into the first sector-cell, all of the first to third sector-cells are pilot signals of the first sector-cell. Will have Therefore, even if the mobile phone moves between the grouped sector-cells, no handoff occurs. At this time, the base station may select as many sector-cells as desired for grouping and connect the pilot signals of the reference sector-cell to the transceivers of the sector-cells to be grouped. Therefore, the grouping method according to the present invention can operate as omni-cell by grouping as many sector-cells as desired.

Since the sector-cell is partitioned to serve more subscribers, the grouped omni-cell base stations cannot serve as many subscribers as the base-cell base stations. Therefore, if the number of subscribers located in the omni-cell increases and the omni-cell structure cannot provide services to all subscribers, the base station ungroups the omni-cell. Therefore, a method of ungrouping omni-cells according to the present invention will be described.

7 is a flowchart illustrating a method for ungrouping sector-cells according to the present invention. Hereinafter, the ungrouping method according to the present invention will be described with reference to FIG. 7.

The base station operating the omni-cell transmits the pilot signal (first pilot signal) of the reference sector-cell (first sector-cell) through the transceiver of the grouped sector-cell (second sector-cell) and the sector-antenna. It is sending out. Therefore, since the transceiver of the second sector-cell and the sector-antenna are transmitting only the first pilot signal, in step s210, the mobile telephone in the second sector-cell is connected to the transceiver of the second sector-cell using the distributor. The first pilot signal of the reference sector-cell (first sector-cell) transmitted through the sector-antenna is used to communicate with the base station.

For ungrouping of the grouped omni-cells, in step 220, the base station transmits a unique pilot signal corresponding to the sector-cell (second pilot signal) before being grouped via the transceiver and the sector-antenna of the second sector-cell. ) To start sending. Then, the transceiver and the sector-antenna of the second sector-cell simultaneously transmit the first pilot signal and the second pilot signal.

In step s230, the mobile phone in communication using the first pilot signal in the second sector-cell newly detects the second pilot signal transmitted through the sector-antenna and the transceiver of the second sector-cell, Report to the base station that a new pilot signal has been detected.

In step s240, the base station which has received the detection of the second pilot signal from the mobile phone sets the idle channel to the traffic channel corresponding to the detected second pilot signal, assigns the set traffic channel to the mobile phone, Notifies the mobile phone that a traffic channel has been assigned. Then, in step S250, the mobile phone simultaneously connects the channel with the traffic channel of the first pilot signal that was originally communicating with the traffic channel of the newly detected second pilot signal, and communicates with the base station through the two channels.

To remove the grouped sector-cells, in step s260 the base station gradually decreases the strength of the first pilot signal transmitted through the transceiver of the second sector-cell and the sector-antenna.

In step s270, the mobile phone in the second sector-cell senses the strength reduction of the first pilot signal and reports the change in pilot strength to the base station. If the strength of the first pilot signal detected by the mobile phone decreases below a certain level, in step s280, the base station disconnects the traffic channel of the first pilot signal to the mobile phone, and only the traffic channel of the second pilot signal. Command to keep

In step s290, the mobile phone disconnects the traffic channel of the first pilot signal and communicates with the base station using only the second pilot signal. In this step, since the base station transmits only the second pilot signal through the transceiver of the second sector-cell and the sector-antenna, the distributor of the base station blocks the first pilot signal connected to the transceiver of the second sector-cell.

Repeating the above ungrouping method for the grouped sector-cells, the grouped sector-cells only transmit pilot signals each having a unique PN offset, so that the mobile phone can distinguish each sector-cell. do.

The present invention can be variously modified and can take various forms and only the specific embodiments thereof are described in the detailed description of the invention. It is to be understood, however, that the present invention is not limited to the specific forms mentioned in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The grouping method according to the present invention can reduce the load of the base station by suppressing the incidence of handoff, and can provide the subscriber with high quality service without disconnection of the call.

In addition, the ungrouping method according to the present invention, when the number of subscribers in the grouped omni-cell increases to increase the frequency capacity of the base station, to return to the original sector-cell structure, and facilitates the location of the subscribers There is an effect that can be grasped.

Claims (8)

A cellular system comprising a plurality of sector-cells each having a unique pilot signal and including a base station for providing a mobile communication service to a mobile telephone in the sector-cell. A base station connecting a divider between a transceiver and a sector interface for all sector-cells, and using the divider to select a sector-cell (first sector-cell) as a reference for grouping; Transmitting, by the base station, the pilot signal (first pilot signal) of the selected first sector-cell through the transceiver and the sector-antenna of the sector-cell (second sector-cell) to be grouped; The mobile telephone communicating with the transceiver of the second sector-cell and the pilot signal of the second sector-cell transmitted through the sector-antenna (second pilot signal) is connected to the transceiver and sector-antenna of the second sector-cell. Newly detecting the first pilot signal transmitted through the MS, and reporting the detection of the first pilot signal to the base station; Allocating a traffic channel corresponding to the first pilot signal to the mobile phone by the base station that has received the detection of the first pilot signal; The mobile telephone recognizing the allocation of the traffic channel, connecting the channel simultaneously with the traffic channel corresponding to the second pilot signal and the traffic channel corresponding to the first pilot signal, and communicating with the base station through two channels; A base station communicating with a mobile telephone over two channels, gradually decreasing the strength of a transceiver of a second sector-cell and a second pilot signal transmitted over a sector-antenna; Detecting, by the mobile telephone communicating with the base station via the two channels, a decrease in the strength of the second pilot signal and reporting a change in strength of the pilot signal to the base station; Receiving a change in the strength of the pilot signal by the base station, instructing the mobile phone to disconnect the traffic channel corresponding to the second pilot signal and to maintain only the traffic channel corresponding to the first pilot signal; And The mobile telephone commanded by the base station disconnects the traffic channel corresponding to the second pilot signal and communicates with the base station using only the traffic channel corresponding to the first pilot signal. Sector-Cell Grouping Method The method of claim 1, wherein the transmitting of the first pilot signal through a transceiver of a second sector-cell and a sector antenna is performed. A method of grouping sector-cells using a divider in a cellular system, wherein a transceiver of the second sector-cell and a sector-antenna simultaneously transmit a second pilot signal and a first pilot signal. The method of claim 1, wherein the command to maintain only the traffic channel corresponding to the first pilot signal, The base station, which has reported a change in the strength of the pilot signal, instructs only to maintain the traffic channel corresponding to the first pilot signal when the strength of the second pilot signal decreases below a certain level. Grouping method. The method of claim 1, wherein the mobile telephone communicates with a base station using only a traffic channel corresponding to a first pilot signal. A method of grouping sector-cells using a divider in a cellular system, wherein both the reference sector-cell and the sector-cells to be grouped will have the same pilot signal (first pilot signal). A cellular system comprising a plurality of sector-cells each having a unique pilot signal and including a base station for providing a mobile communication service to a mobile telephone in the sector-cell. The mobile telephone in the second sector-cell constituting the grouped omni-cell is connected to the transceiver of the second sector-cell selected using the distributor and the reference sector-cell (first sector-cell) sent out through the sector-antenna. Communicating with a base station using a first pilot signal; Transmitting, by the base station, a unique pilot signal (second pilot signal) through a transceiver of the second sector-cell and a sector-antenna; Detecting, by the mobile phone communicating using the first pilot signal, a second pilot signal transmitted through the sector-antenna and a transceiver of the second sector-cell, and reporting the detection of the second pilot signal to the base station; Allocating a traffic channel corresponding to the second pilot signal to the mobile phone by the base station, which has received the detection of the second pilot signal; The mobile telephone recognizing the allocation of the traffic channel, connecting the channel simultaneously with the traffic channel corresponding to the first pilot signal and the traffic channel corresponding to the first pilot signal, and communicating with the base station through the two traffic channels; A base station communicating with a mobile telephone over two channels, gradually decreasing the strength of a transceiver of a second sector-cell and a first pilot signal transmitted over a sector-antenna; Detecting, by the mobile telephone communicating with the base station via the two channels, a decrease in the strength of the first pilot signal and reporting a change in the strength of the pilot signal to the base station; Receiving a change in the strength of the pilot signal by the base station, instructing the mobile phone to disconnect the traffic channel corresponding to the first pilot signal and to maintain only the traffic channel corresponding to the second pilot signal; And A sector using a splitter in a cellular system, comprising the mobile phone commanded by the base station cutting the traffic channel corresponding to the first pilot signal and communicating with the base station using only the traffic channel corresponding to the second pilot signal. How to ungroup cells. The method of claim 1, wherein the transmitting of the second pilot signal through the transceiver and the sector antenna of the second sector-cell, A method of ungrouping a sector-cell using a divider in a cellular system, wherein the transceiver of the sector-cell to be grouped and the sector-antenna simultaneously transmit a second pilot signal and a first pilot signal. The method of claim 1, wherein the step of instructing to maintain only the traffic channel of the second pilot signal is: Ungrouping of sector-cells using a splitter in a cellular system instructing the base station, which has reported a change in the strength of the pilot signal, to maintain only the traffic channel of the second pilot signal when the strength of the first pilot signal decreases below a certain level. Way. The method of claim 1, wherein communicating with a base station using only a traffic channel corresponding to the second pilot signal, A method of ungrouping a sector-cell using a divider in a cellular system, wherein the reference sector-cell and the grouped sector-cell each have a unique pilot signal.