KR101177943B1 - In-building System and Method of Service Boundary Maintenance in the same - Google Patents

Abstract

The present invention proposes an in-building system and a service area adjustment method of the in-building system. The present invention is to install a dummy terminal in the boundary area of the area to be serviced in the in-building system and to measure the ratio (Ec / Io) of the received power to the noise power of the forward pilot channel, the forwarding received by the inbuilding system from the dummy terminal The transmit power of the forward pilot channel is adjusted by using the Ec / Io of the pilot channel. In this way, the service area can be kept constant regardless of the load of the system.

Inbuilding System, Ec / Io, Pilot Channel

Description

In-building System and Method of Service Boundary Maintenance in the same}

1 is a diagram illustrating an example in which a service area is changed in an in-building system to which the present invention is applied.

2 is a diagram illustrating a method of installing a dummy terminal in an inbuilding system according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating a method of reporting a measured value of a dummy terminal in an inbuilding system according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating a method of adjusting transmission power in an inbuilding system according to an embodiment of the present invention.

The present invention relates to an in-building system, and more particularly to a method of maintaining a constant service area of an in-building system.

In-building system is a system that provides an in-building service to a user terminal so that many users can share wireless communication at the same time by installing a private switching network in the same building or between several buildings in a certain area. As such, the in-building system sets only a specific building area as a service area, and services are provided through an existing cellular system in an area other than the set service area.

On the other hand, in a cellular system such as Code Division Multiple Access (CDMA) or Wideband Code Division Multiple Access (WCDMA), the service area is generally the ratio of the received power to the noise power of the forward pilot channel (Energy of carrier / Interference). of others (hereinafter referred to as "Ec / Io"). In the in-building system, an example of the application of such a cellular system, the amount of transmit power of the forward pilot channel, which is one of the factors determining the service area, is calculated at the first designing of the service area, and the value calculated once is fixed without being changed. Continued use As such, when the amount of transmit power of the forward pilot channel is fixed, the receive power of the forward pilot channel is also maintained substantially constant. Therefore, it can be said that the service area of the inbuilding system is determined by the amount of noise power received.

1 is a diagram illustrating an example in which a service area is changed in an in-building system.

In FIG. 1, A denotes an area originally designed as an in-building service area. This in-building service area may change according to the load. For example, the load increases as the number of users of the in-building system or the neighboring cellular system increases, and accordingly, the amount of received noise power increases, thereby reducing the in-building service area to A1. In this case, even within the area A originally designed as an in-building service area, an external neighboring cellular system is served. On the other hand, when the number of users of the in-building system or the neighboring cellular system decreases, the load decreases, thereby reducing the amount of received noise power, thereby extending the service area of the in-building system to A2. Therefore, in-building services will be received even in areas that were not originally designed as in-building service areas.

As such, when the boundary of the service area of the in-building system is changed according to the load change of the system, it is impossible to guarantee a certain in-building service area and thus cannot provide a correct in-building service to the user.

It is therefore an object of the present invention to provide an in-building system and method for maintaining a constant service area by actively changing the amount of forward pilot channel transmission power according to a situation.

A base station providing an in-building service to a mobile terminal located in a service area according to the present invention includes a receiving unit for receiving a ratio (Ec / Io) of the received power of the forward pilot channel and the total received noise power from a dummy terminal, A method of increasing the transmit power of the forward pilot channel if Ec / Io is less than a reference value, and reducing the transmit power of the forward pilot channel if the received Ec / Io is greater than the reference value, a preset lookup table and a preset calculation formula And controlling the transmission power of the forward pilot channel using one to maintain the service area constant.

In addition, the dummy terminal for providing an in-building service to the mobile terminal located in the service area according to the present invention, is installed in the boundary area of the service area to determine the ratio (Ec / Io) of the received power and the total received noise power of the forward pilot channel A control unit for measuring and transmitting the measured Ec / Io to the base station at a predetermined time interval or for transmitting to the base station when the measured Ec / Io is greater than an upper threshold value or less than a lower threshold value. .

In addition, the method for adjusting the service area by the base station in the in-building system including a base station for providing an in-building service to a mobile terminal located in the service area according to the present invention, the received power of the forward pilot channel and the total reception from the dummy terminal Receiving a ratio of noise power (Ec / Io), and if the received Ec / Io is less than a reference value, increases the transmit power of the forward pilot channel and if the received Ec / Io is greater than the reference value, the forward pilot A method of reducing a transmission power of a channel, and adjusting the transmission power of the forward pilot channel by using one of a preset lookup table and a predetermined calculation formula, thereby maintaining the service area constant.

In addition, the method for adjusting the service area by the dummy terminal in the in-building system including a base station for providing an in-building service to the mobile terminal located in the service area according to the present invention, is installed in the boundary area of the service area forward pilot Measuring a ratio (Ec / Io) of the received power of the channel to the total received noise power, and transmitting the measured Ec / Io to the base station at a predetermined time interval or the measured Ec / Io is higher than the upper threshold value. Transmitting to the base station when greater than or less than a lower threshold.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise.

The present invention proposes a method of maintaining a constant service area of an inbuilding system by using a dummy terminal which is not used by a user.

2 is a diagram illustrating a method of installing a dummy terminal in an inbuilding system according to an exemplary embodiment of the present invention.

As shown in FIG. 2, in the in-building system according to an exemplary embodiment of the present invention, a dummy terminal 200 is installed in a boundary area of an area A to provide in-building service, and the dummy terminal 200 is installed. The Ec / Io value of the forward pilot channel of the inbuilding system is measured. In this case, the dummy terminal 200 may not have a separate function other than the function of measuring the Ec / Io value of the forward pilot channel.

In addition, the in-building system according to the embodiment of the present invention may include a plurality of user terminals, a base station, a control station and a repeater in addition to the dummy terminal, like a general mobile communication system. Operation of each part constituting the inbuilding system is similar to a general mobile communication system, which is obvious to those skilled in the art, and thus detailed description thereof will be omitted. Hereinafter, the operation between the base station and the dummy terminal 200 of the in-building system according to the present invention will be described mainly.

The dummy terminal 200 according to the embodiment of the present invention is installed to be connected to a base station (not shown) of the in-building system by wire or wirelessly, and the Ec / Io value measured by the dummy terminal 200 according to the installation method. This is transmitted to the base station of the inbuilding system via wired or wireless. In the case of the wired transmission, since the reverse link radio resource of the system does not need to be used, there is no increase in the radio link load additionally generated in applying the present invention. In the case of wireless transmission, the dummy terminal 200 is easier to install than the wired transmission.

In addition, the dummy terminal 200 transmits the Ec / Io value to the base station of the in-building system at a set time interval, or the measured value to the base station of the in-building system only when the measured Ec / Io value reaches a predetermined threshold value. May be operative to transmit.

3 is a diagram illustrating a method of measuring and transmitting an Ec / Io value of a forward pilot channel in a dummy terminal according to an embodiment of the present invention.

As shown in FIG. 3, the dummy terminal according to an embodiment of the present invention measures the Ec / Io value of the forward pilot channel at a predetermined time interval (S301), and the Ec / I of the forward pilot channel measured according to the set transmission mode. The Io value is periodically transmitted to the base station of the inbuilding system or only when the predetermined threshold is reached (S302).

When the dummy terminal operates in the periodic transmission mode, it is checked whether the preset time has elapsed (S303). If the dummy terminal has elapsed, the Ec / Io value of the measured forward pilot channel is transmitted to the base station of the in-building system (S305). On the other hand, when the dummy terminal operates in a mode for transmitting when the threshold is reached, the measured Ec / Io value of the forward pilot channel is compared with the predetermined upper threshold value and lower threshold value (S304), and the comparison result Ec / Io measurement If the value is greater than the upper threshold value or less than the lower threshold value, the measurement value is transmitted to the base station of the in-building system (S305).

If the predetermined time has not elapsed in step S303 or the measured value does not reach the upper threshold value or the lower threshold value in step S304, the process returns to step S301 to continue measuring the Ec / Io value.

In FIG. 3, a case in which the dummy terminal periodically transmits an Ec / Io value or transmits only when the threshold value is reached is described. However, the two methods may be used simultaneously.

4 is a flowchart illustrating a method of adjusting forward pilot channel transmit power in a base station of an inbuilding system according to an embodiment of the present invention.

As shown in Figure 4, the base station of the in-building system according to an embodiment of the present invention first receives the Ec / Io value of the forward pilot channel in the service boundary area transmitted from the dummy terminal (S401). Next, the base station of the in-building system actively adjusts the forward pilot channel transmit power according to a predetermined rule by using the received value (S402 to S403).

That is, if the Ec / Io value reported from the dummy terminal is small, the current noise power is large, and the large noise power means that the number of users of the in-building system or the neighboring cellular system is increased, thereby reducing the service area. . Thus, in this case, the base station of the inbuilding system increases the forward pilot channel transmit power so that the service boundary area remains constant.

On the other hand, if the Ec / Io value reported from the dummy terminal is large, the current noise power is small, and the small noise power means that the number of users of the in-building system or the neighboring cellular system is reduced, so that the service area can be enlarged. have. Therefore, in this case, the base station of the in-building system reduces the transmission power of the forward pilot channel so that the service boundary area is kept constant without being enlarged.

On the other hand, when adjusting the transmit power of the forward pilot channel according to the Ec / Io value reported from the dummy terminal, according to the environment of the inbuilding system (number of users, system load, priority channel status of the building in which the building system is installed), etc. The transmission power adjustment amount of the forward pilot channel may be determined using a look up table that is calculated and stored, or by using a predetermined predetermined formula. For example, if the Ec / Io value reported from the dummy terminal is 10W, the transmit power of the forward pilot channel is set to 100 mW. If the Ec / Io value reported from the dummy terminal is 20W, the transmit power of the forward pilot channel is Can be set to about 50mW.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

As described above, the present invention prevents the service area from constantly changing in the in-building system and maintains a constant service area so that the user can be provided with a stable in-building system service.

In addition, according to the present invention, since the service area of the in-building system is kept constant, an operator providing an in-building service can provide various services to the user in the service area.

In addition, the present invention can be easily applied to an already built in-building system because it can be applied by simple modification of system software without changing the system standard.

Claims (8)

A base station for providing an in-building service to a mobile terminal located within a service area, A receiver for receiving a ratio (Ec / Io) of the received power of the forward pilot channel and the total received noise power from the dummy terminal; A method of increasing the transmit power of the forward pilot channel if the received Ec / Io is less than a reference value, and reducing the transmit power of the forward pilot channel if the received Ec / Io is greater than the reference value, a preset lookup table and a preset And a control unit configured to adjust the transmission power of the forward pilot channel using one of the set calculation formulas to maintain the service area constant. The apparatus of claim 1, The base station, characterized in that for receiving the Ec / Io from the dummy terminal at a predetermined time interval. The apparatus of claim 1, And the Ec / Io transmitted from the dummy terminal when the Ec / Io is greater than an upper threshold value or less than a lower threshold value. A dummy terminal for providing an in-building service to a mobile terminal located in a service area, A control unit installed at a boundary area of the service area and measuring a ratio (Ec / Io) of the received power of the forward pilot channel and the total received noise power; And a transmitter configured to transmit the measured Ec / Io to the base station at a predetermined time interval or to transmit the measured Ec / Io to the base station when the measured Ec / Io is greater than an upper threshold value or less than a lower threshold value. A method of adjusting the service area by a base station in an in-building system including a base station providing an in-building service to a mobile terminal located within a service area, Receiving a ratio (Ec / Io) of the received power of the forward pilot channel and the total received noise power from the dummy terminal; A method of increasing the transmit power of the forward pilot channel if the received Ec / Io is less than a reference value, and reducing the transmit power of the forward pilot channel if the received Ec / Io is greater than the reference value, a preset lookup table and a preset And adjusting the transmission power of the forward pilot channel by using one of the set calculation formulas to maintain the service area constant. According to claim 5, The receiving process, The service area control method in the in-building system, characterized in that the process of receiving the Ec / Io from the dummy terminal at a predetermined time interval. According to claim 5, The receiving process, And receiving the transmitted Ec / Io from the dummy terminal when the Ec / Io is greater than an upper threshold value or less than a lower threshold value. A method of adjusting the service area by a dummy terminal in an in-building system including a base station providing an in-building service to a mobile terminal located within a service area, Measuring a ratio (Ec / Io) of the received power of the forward pilot channel and the total received noise power, installed at a boundary area of the service area; In the building system comprising the step of transmitting the measured Ec / Io to the base station at a predetermined time interval or when the measured Ec / Io is greater than the upper threshold value or less than the lower threshold value How to adjust your service area.

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