KR100491885B1 - WLL terminal having a mobility restrict function and controlling method therefore - Google Patents

Abstract

The present invention provides a base station to each base station using a reception power strength measurement step of individually measuring reception power strengths transmitted from a plurality of base stations in a WLL terminal, and the reception power strength of each base station measured by the reception power strength measurement step. A base station effective reception range setting step of registering a terminal to each base station by setting an effective reception power range for the base station; and a reception signal strength value currently received from a plurality of base stations currently set after the base station effective reception range setting step; The base station active area checking step of checking whether the base station is within the range for each base station and the base station active area checking step. Terminal deactivation step, and If the result of check in the position check step the base station active region all the plurality of base stations in the active region and provides the mobility restriction function is provided with a WLL terminal, and a control method consisting of terminal activation step of activating all of the features of WLL terminals. As described above, the present invention sets the active area range by measuring the received signal strength of a plurality of adjacent base stations at the time of initial registration of the calibrated terminal, and then all signal strength values received from the base stations are located within the active area range. By only allowing the WLL terminal to operate, the mobility limitation function can be executed correctly.

Description

WLL terminal having a mobility restriction function and its control method {WLL terminal having a mobility restrict function and controlling method therefore}

The present invention relates to a WLL terminal equipped with a mobility limitation function and a control method thereof. In particular, when initial registration of a calibrated terminal, the received signal strengths of a plurality of adjacent base stations are respectively measured to set an active area range. The present invention relates to a WLL terminal equipped with a mobility limiting function that accurately executes a mobility limiting function by allowing the WLL terminal to operate only when all received signal strength values are located within an active range.

In general, a wireless local loop (WLL) system is a telephone system that wirelessly connects subscriber lines within a distance of about 2-6 [km] from a base station without using a conventional telephone line. Many WLL-type systems have been developed and used, including satellite systems, fixed microwave systems, cellular technology systems, and cordless systems. Used. The system using this cellular technology can coexist with the same network as the cellular mobile phone or PERSONAL COMMUNICATION SERVICE (PCS), and can cover a wider area, making the network more economical.

In addition, three multiple access schemes, that is, frequency division multiple access scheme (FDMA), time division multiple access scheme (TDMA), and code division multiple access scheme (hereinafter, referred to as CDMA) are used in a system using the cellular technology. In addition, a dual CDMA type WLL system is widely used.

Then, the conventional CDMA WLL system as described above is installed in a predetermined area as shown in Figure 1 base station system 70 for processing the communication signal of the subscriber network transmitted wirelessly, and channel assignment to the base station system 70 It is largely divided into WLL terminal 71 which transmits a random access signal for request and performs necessary communication.

In addition, the WLL terminal 71 is a RF unit 72 for processing an RF signal for communication with the base station system 70, a signal that is demodulated or transmitted to the outside RF signal input from the RF unit 72 A modem 73 that modulates the < RTI ID = 0.0 > and < / RTI > the CPU 74 that controls the overall function of the terminal 71, including the modem 73, and counts time in accordance with a random access time control signal of the CPU 74. It consists of a timer (75).

A voice signal processor 76 for processing a voice signal is connected to one end of the modem 73, and a key panel unit 77 for setting a user's request signal, for example, a dialing signal, to one end of the CPU 74. ) Is connected.

On the other hand, referring to the operation of the conventional CDMA WLL system configured as described above, when using the WLL terminal 70 for the first time, the user registers the terminal in the neighbor base station system 70 and the sector range of the neighbor base station system 70 Will only be used within. At this time, when the user of the WLL terminal 70 dials through the key panel unit 77 to perform necessary communication, the CPU 74 of the WLL terminal 71 recognizes this signal. Then, the CPU 74 of the WLL terminal 71 inputs a channel allocation request signal for making a call to the modem 73. At this time, the CPU 74 drives the timer 75 to drive the base station system 70. Continue to check until a channel assignment message is received. The modem 73 modulates the channel allocation request signal and inputs the signal to the RF unit 72. Accordingly, the RF unit 72 processes the input channel allocation request signal of the modem 73 as an RF signal. The base station system 70 transmits.

At this time, the base station system 70 stores the registration information of the WLL terminal 71, and when the channel allocation request signal is input from the WLL terminal 71, the corresponding terminal information and the registered information are compared and then matched. If the call setup is approved, the base station system 70 transmits a message signal indicating the channel assignment, for example, a CHANNEL_REO_ACK signal or an ASSIGNMENT signal, when the channel 71 is allocated to the terminal 71.

Then, the CPU 74 of the WLL terminal 71 recognizes this through the RF unit 72 and the modem 73, terminates the function of the timer 75, and transmits data, for example, a voice signal through the connected call channel. Voice data input through the processing unit 76 is transmitted to the base station 70 to form a call. Here, if the CPU 74 of the WLL terminal 71 does not receive a channel assignment message from the base station system 70 until the time of the timer 75, which is counted after transmitting the channel assignment request signal, is random, It is considered a failure of access. For example, when random accesses of two WLL terminals collide wirelessly, the terminal stations do not receive a channel assignment message. Accordingly, the CPU 74 of the WLL terminal 71 waits until the timer 75 expires, and when the CPU 74 ends, transmits a channel allocation request signal back to the base station system 70 after a random time has elapsed. To form.

In this process, the base station system 70 monitors the movement of the terminals registered to the base station system 70, and if there is a terminal that attempts to register / call to another base station or handoff to another base station, the base station system 70 Forcibly disconnect or interrupt service.

However, in the conventional WLL terminal system, the system load is considerably increased because the base station system must monitor and manage the mobility of the plurality of WLL terminals, that is, location history or handoff, and the WLL terminal as described above. In the method of limiting mobility of the UE, the usable area varies considerably according to the region where each terminal is located. For example, the WLL terminal used near the base station can be guaranteed mobility in a wider area regardless of the moving direction. Since the WLL terminal used near the base station boundary is not so far, there is a problem that the mobility limitation of the WLL terminal is not accurately monitored.

Accordingly, the present invention has been invented to solve the above-mentioned conventional problems, and sets the active area range by measuring the received signal strength of a plurality of adjacent base stations at the time of initial registration of the calibrated terminal, and then receives each of these base stations. WLL terminal is operated only when all the signal strength values are within the active area range, so the mobility limit function is executed correctly. Therefore, the WLL terminal is equipped with the mobility limit function to maximize the mobility limit monitoring function of the WLL terminal. And a control method thereof.

Another object of the present invention is to perform the mobility restriction function using only the base station received signal strength value without the need to install a separate monitoring equipment for the mobility limitation of the terminal, thereby significantly reducing the installation cost for the mobility limitation function of the WLL terminal The present invention provides a WLL terminal having a mobility limitation function and a control method thereof.

 The present invention for achieving the above object is in the WLL terminal system for performing communication with the adjacent base station, measuring the received signal strength transmitted from the plurality of adjacent base stations and processing the RF signal for communication with the base station A control unit for setting an effective receiving power range of the received signal strength for each base station measured by the RF module and operating the terminal only when all of the received base station signals are located in an active region; and function control of the control unit. Provided is a WLL terminal having a mobility limitation function including a memory unit for storing data for corrected effective power of received signal strength of each neighboring base station according to an initial registration of a terminal according to a signal.

Another feature of the present invention is to use the received power strength measurement step of measuring each of the received power strength transmitted from a plurality of base stations in the WLL terminal individually, and using the received power strength of each base station measured by the received power strength measurement step A base station effective reception range setting step of registering a terminal to each base station by setting an effective reception power range for each base station, and a received signal strength value currently received from a plurality of base stations currently set after the base station effective reception range setting step As a result of checking the base station active area for each base station to determine whether it is within the set effective receiving range, and the base station active area checking step, if any base station among the plurality of base stations is located in an inactive area, Deactivate terminal to deactivate terminal And a terminal activation step of activating all of the functions of the WLL terminal when all of the base stations are located in the active region as a result of the step of checking the base station active region. .

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

As shown in FIG. 2, the WLL terminal of the present invention measures an RF signal received from a plurality of adjacent base stations 1A-C and processes an RF signal for communication with the base stations 1A-C. (2) and setting the range of the received signal strength for each base station respectively measured by the RF module 2 to operate the WLL terminal 3 only in the active region and to control the functions of the WLL terminal 3 as a whole. A memory unit 5 for storing received signal strength values of adjacent base stations according to the initial registration of the terminal according to the function control signal of the controller 4 and other processing information of the WLL terminal 3. And a modem 6 for demodulating the RF signal input from the RF module 2 or modulating the signal transmitted to the outside according to the control signal of the controller 4.

One end of the control unit 4 is connected to a key panel unit 7 for setting a user's request signal and an LCD panel 8 for displaying an internal processing state of the WLL terminal 3 as a display signal.

In this case, the WLL terminal 3 generally performs a calibration operation on the reception power at the time of manufacture of the product, and this calibration operation shows the gain of the gain amplifier between the control unit in the terminal antenna as shown in FIG. 3. By appropriately adjusting, the received signal power input to the controller of the terminal is kept constant even if the received power flowing into the terminal changes. In other words, when the terminal is manufactured, various distances from the base station for measurement are selected in detail, and appropriate received signal level values according to the received distance are selected.

The calibration job data is calculated and stored in the memory unit 5. In addition, the terminal executes power control with the base station by using pre-stored calibration data during actual use of the terminal.

Next, the control method of the present invention having the configuration as described above will be described.

As shown in FIG. 4, the method of the present invention proceeds to the receiving power intensity measuring step S2 in the initial state S1 and separately measures the received power strengths transmitted from the plurality of base stations currently received by the terminal. After the reception power strength measurement step S2, the base station effective reception range setting step S3 is performed to set an effective reception power range, that is, an active area, for each base station by using the reception power strength of each base station currently measured. Register the terminal with each base station.

In addition, after the base station effective reception range setting step (S3), the process proceeds to a first active area determination step (S4) to determine whether the strength of the received power received from any first base station currently set is within a predetermined effective reception range. do. At this time, if the strength of the received power received from any first base station currently set as a result of the determination in the first active area determination step (S4) is not located within the preset effective reception range terminal deactivation step ( Proceed to S5) to deactivate the terminal.

However, as a result of the determination during the first active region determination step S4, when the intensity of the received power received from any first base station currently set is within the preset effective reception range, the second active region determination step S5 is performed. In operation, it is determined whether the strength of the received power received from any second base station currently set is within a preset valid reception range.

In this case, if the strength of the received power received from any second base station currently set is not within the preset effective reception range as a result of the determination in the second active area determination step (S6), the terminal mobility limit mode is performed. Proceed to S5) to deactivate the terminal.

However, as a result of the determination during the second active area determination step S6, when the intensity of the received power received from any second base station currently set is within the preset effective reception range, the third active area determination step S7 is performed. It proceeds to determine whether the strength of the received power received from any third base station currently set is within the preset effective reception range.

If the strength of the received power received from any third base station currently set is not within the preset effective reception range as a result of the determination in the third active area determination step S7, the terminal mobility limitation mode is performed. Proceed to S5) to deactivate the terminal.

However, when it is determined during the third active area determination step S7 that the strength of the received power received from any third base station currently set is within the preset effective reception range, the terminal proceeds to the terminal activation step S8. Activate to execute the function of the set terminal.

Here, the active area determination process has been described assuming that three base stations are related. However, the present invention is not limited thereto, and determines all base stations transmitting signals to the terminal. That is, if the base stations are five, the received power strengths transmitted from the five base stations are measured.

In other words, when the CDMA WLL terminal is used for the first time, it receives signals from neighboring base stations to obtain various base station information, or transmits the terminal information to the base station, registers the terminal with the base station, and then uses it normally. do. In this case, the terminal as described above is pre-adjusted during the manufacture of the product according to the terminal receiving power, which varies in accordance with the movement of the terminal is built as the calibration operation data, the terminal 3 of the present invention is the calibration operation data As a reference value, the value of the received power strength of all neighboring base stations received at the time of first use is measured to set an effective reception range, that is, an active area for each base station.

That is, the control unit 4 of the WLL terminal 3 of the present invention uses the RF module 2 in the future when the turn-on signal is input through the key panel unit 7 as shown in FIG. The received signal strength transmitted from each base station 1A-C is measured at the use position of the terminal 3. In this case, the controller 4 uses the calibration operation data pre-stored in the memory unit 5 as a reference value, so that the effective reception power range of the received power intensity values received and measured from the base stations 1A-C, respectively, is measured. For example, as shown in FIG. 3, the active area is set and stored in the memory unit 5 by setting an effective receiving power range for each base station by dividing the inactive area and the active area.

In this case, the effective reception power range may have an effect of limiting the distance between the base station and the terminal, and the activation area has an extra range appropriate for the change range of the terminal reception power value for a suitable time after the terminal is first turned on. It is set to the added value.

On the other hand, when the effective reception power range for each base station (1A-C) is determined through the above process, the control unit 4 through each of the base station (1A-) through the RF module 2 as shown in FIG. The received power strength received from C) is continuously detected to determine whether the base station is in the effective receiving power range, that is, the active area, stored in the memory unit 5.

Here, if it is assumed that there are three base stations 1A-C adjacent to the WLL terminal 3 of the present invention, the control unit 4 determines that the received signal strength received from each base station 1A-C Activate the terminal only if it is within the valid receiving power range. For example, the received signal strength of the first base station 1A and the second base station 1B is in the effective received power range of the base stations 1A and 1B, but the received signal strength of the third base station 1C is the corresponding base station. If it is not within the effective receiving power range of 1C, the controller 4 deactivates the WLL terminal 3 to limit the mobility of the WLL terminal 3.

However, the controller 4 checks the normal operation state of the terminal when the received signal values of the three base stations 1A-C are within the effective receiving power range of the corresponding base stations 1A-C, and the WLL terminal 3 Activate to activate normal call mode. Then, the WLL terminal 3 forms a call using the telephone number set by the user, processes the voice signal input through the handset 9 through the modem 6 and the RF module 2 to process the corresponding terminal. And the execution of this function via the LCD panel 8.

As described above, the present invention sets the active area range by measuring the received signal strength of a plurality of adjacent base stations at the time of initial registration of the calibrated terminal, and then, the signal strength values respectively received from these base stations are all within the active area range. Since the WLL terminal is operated only when located, the mobility limitation function is executed correctly, and thus the WLL terminal has the advantage of maximizing the mobility limitation monitoring function.

In addition, according to the present invention, since the mobility limitation function is executed using only the base station received signal strength value without installing a separate monitoring device for the mobility limitation of the terminal, the facility cost for the mobility limitation function of the WLL terminal is significantly reduced accordingly. There are also effects that can be made.

1 is an explanatory diagram illustrating a conventional WLL terminal.

2 is an explanatory diagram illustrating a WLL terminal of the present invention.

3 is a graph illustrating the results of calibration work during terminal manufacture.

4 is a flowchart of the present invention.

5 is an explanatory diagram showing an activation area set by the WLL terminal of the present invention;

6 is an explanatory diagram illustrating mobility limitation function using a WLL terminal of the present invention.

<Detailed Description of Codes>

1A-C: Base Station 2: RF Module

3: WLL terminal 4: control unit

5 memory unit 6 modem

7: Key panel part 8: LCD panel

9: handset 10: counterpart terminal

Claims (4)

A WLL terminal system for communicating with an adjacent base station, An RF module measuring received signal strength transmitted from a plurality of adjacent base stations and processing an RF signal for communication with a base station, and setting an effective received power range of received signal strength for each base station measured by the RF module And a control unit for operating the terminal only when all received base station signals are located in an active region, and corrected data of effective reception power of received signal strengths of adjacent base stations according to initial registration of the terminal according to the function control signal of the controller. WLL terminal with mobility limitation function, characterized in that it comprises a memory for storing the. The WLL terminal according to claim 1, wherein the effective reception power range value of the control unit is calculated by using calibration data as a reference value. The WLL terminal according to claim 1, wherein the effective reception power range for each base station is an active region located between an inactive region and an inactive region. Effective reception for each base station using a received power strength measurement step of individually measuring the received power strengths transmitted from a plurality of base stations in the WLL terminal, and the received power strength of each base station measured by the received power strength measurement step. A base station effective reception range setting step of setting a power range and registering a terminal to each base station, and a received signal strength value currently received from a plurality of base stations currently set after the base station effective reception range setting step is located within a preset effective reception range. Determining whether the base station active area for each base station to determine whether the base station active area and the base station active area confirmation step, if any of the base station is located in the inactive area terminal deactivation terminal by deactivating the terminal by checking that the terminal mobility limit mode And the base station The control method of the WLL terminal with mobility limitation function, characterized in that the terminal activation step of activating all the functions of the WLL terminal when a plurality of base stations are all located in the active area as a result of the confirmation during the active area confirmation step.