KR20180080482A - LTE(Long Term Evolution) and WCDMA(Wideband Code Division Multiple Access) gain setting method for ensuring stable coverage of mobile communication ICS (Interference Cancellation System) Repeater system - Google Patents

Abstract

According to the present invention, it is possible to calculate a propagation loss in a wireless environment generated between a mobile communications base station and a mobile communications interference cancellation system (ICS) relay system by using a reference signal (RS) level of LTE and a common pilot channel (CPCIH) level of WCDMA regardless of a traffic amount among downlink signals transmitted from the mobile communications base station to the mobile communications terminal in an environment wirelessly connected between the mobile communications base station and the mobile communications ICS relay system. However, when a level of a fed back signal among signals output from the mobile communications ICS relay system is input to be high, a large error is generated to calculate a propagation loss in a wireless environment, wherein when the level of the fed back signal is additionally applied and calculated, it is possible to calculate a propagation loss between the mobile communications base station and the mobile communications ICS relay system. The mobile communications ICS relay system can secure stable coverage by controlling downlink and uplink gains of the mobile communications ICS relay system based on the calculated basis, thereby improving call and data quality of a mobile communications terminal.

Description

(Long Term Evolution) and WCDMA (Wideband Code Division Multiple Access) method for establishing long term evolution (LTE) and wideband code division multiple access (WCDMA) gain for ensuring stable coverage of a mobile communication ICS (Interference Cancellation System) gain setting method for ensuring stable coverage of mobile communication ICS (Interference Cancellation System) Repeater system}

The present invention calculates a propagation loss in a Long Term Evolution (LTE) and a Wideband Code Division Multiple Access (WCDMA) service system occurring in a wireless environment between a mobile communication base station and a mobile communication ICS (Interference Cancellation System) And a method for setting uplink and uplink gains of an ICS (Interference Cancellation System) relay system.

A mobile communication system refers to a communication system that enables a user to communicate regardless of a location by transmitting and receiving voice or data through a wireless signal with a user terminal.

The mobile communication system uses a mobile communication relay system to perform wireless communication with a terminal through a base station disposed in a plurality of areas and to enable communication in a wider area than a coverage area of a base station or a base station.

The mobile communication relay system is connected to the base station by radio or wire, amplifies the downlink mobile communication signal transmitted from the base station, and transmits the amplified downlink mobile communication signal to the terminal located in its coverage area, or receives the uplink signal transmitted from the terminal located in its coverage area To the base station.

When the mobile communication base station and the mobile communication relay system are connected wirelessly, it is difficult to measure the propagation loss generated in the wireless environment. It is difficult to calculate whether the level has changed due to the external environment change or not by the amount of traffic.

A mobile communication ICS (Interference Cancellation System) relay system is wirelessly connected to a mobile communication base station. The mobile communication ICS (Interference Cancellation System) relay system amplifies and radiates signals fed back to the mobile communication ICS (Interference Cancellation System) It is a system that has the function to be able to operate normally in the re-inflow environment.

Here, if the feedback level of the feedback signal is higher than the level transmitted and received by the mobile communication base station, an error occurs in the calculation of the propagation loss generated in the wireless environment.

Therefore, a conventional ALC (Wideband Code Division Multiple Access) transmission method can be used without using a method of calculating Long Term Evolution (LTE) and Wideband Code Division Multiple Access (WCDMA) propagation loss occurring in a wireless environment between a mobile communication base station and a mobile communication ICS (Interference Cancellation System) (Automatic Level Control) function.

When the ALC function using the output level of the mobile communication ICS (Interference Cancellation System) relay system is applied, the downlink gain is changed depending on the amount of traffic and the output level is changed. If the amount of traffic to be transmitted to the mobile communication terminal is large, the output level of the mobile communication ICS relay system increases and the downlink gain decreases. If the amount of traffic is small, the output level of the mobile communication ICS relay system decreases and the downlink gain increases . Here, the uplink gain is the same as the downlink gain.

As shown in FIG. 2, the uplink coverage of the mobile communication ICS relay system is changed according to the traffic amount of the downlink, and the uplink coverage is changed. Here, even though the radio environment between the mobile communication base station and the mobile communication ICS relay system does not change, the propagation loss between the mobile communication base station and the mobile communication ICS relay system is considered to be converted even though the propagation loss has not changed, The quality drops.

(Long Term Evolution) and WCDMA (Wideband Code Division Multiple Access) propagation loss occurring in a wireless environment between a mobile communication base station and a mobile communication ICS (Interference Cancellation System) relay system are correlated with a feedback signal level and a traffic amount And to provide a downlink and uplink gain control method and apparatus for establishing a stable coverage of a mobile communication ICS (Interference Cancellation System) relay system.

As a means for solving the above-mentioned problems, the present invention provides a mobile communication system, a mobile communication system, and a mobile communication system, The propagation loss is calculated using RSP (Reference Signal) signal level or WCDMA CPICH (Common Pilot Channel) signal level.

The RSP (Reference Signal Power) of LTE or the CPCIH (Common Pilot Channel) output level of WCDMA among the downlink signals transmitted from the mobile communication base station to the mobile communication terminal by radio and the LTE signal received from the mobile communication ICS (Interference Cancellation System) Extracting a radio parameter indicating a received signal code power (RSCP) level of a reference signal received power (RSRP) or a WCDMA from a modem section; Calculating a propagation loss occurring in a radio environment between a mobile communication base station and a mobile communication ICS (Interference Cancellation System) relay system in a main controller unit (MCU) using the radio parameter; Extracting a level of a signal fed back from a service antenna to a donor antenna and a level of a signal normally input in a downlink ICM (Interference Cancellation Module); In the MCU (Main Controller Unit), based on the extracted data, the signal level of RSR (Reference Signal Received Power) of LTE or received signal code power (RSCP) of WCDMA transmitted from the mobile communication base station and received by the repeater, (RSC) of a re-incoming LTE or a received signal code power (RSCP) level of a WCDMA, which is output from the Interference Cancellation System (RS) relay system, and the MCU (Main Controller Unit) A method and an apparatus for setting a downlink and an uplink gain of a mobile communication ICS (Interference Cancellation System) relay system.

The wireless parameter may include at least one of a physical cell identity (PCI), a reference signal power (RSP), a common pilot channel (CPCIH), a reference signal received power (RSRP), a received signal code power have.

According to the present invention, long term evolution (LTE) and wideband code division multiple access (WCDMA) propagation loss in a wireless environment occurring between a mobile communication base station and a mobile communication ICS (Interference Cancellation System) This is possible. When the downlink and uplink gains are set based on the calculated basis, the coverage according to the amount of traffic is not changed, thereby providing a stable coverage, thereby improving the call and data quality of the mobile communication terminal.

FIG. 1 schematically shows a configuration of a mobile communication ICS (Interference Cancellation System) relay system in a configuration in which a mobile communication BS and a mobile communication ICS (Interference Cancellation System) Fig.
FIG. 2 is a block diagram illustrating a configuration of a mobile communication system according to an exemplary embodiment of the present invention. Referring to FIG. 2, a mobile communication ICS (Interference Cancellation System) Fig.
3 is a block diagram schematically illustrating an internal configuration of a mobile communication ICS (Interference Cancellation System) relay system for controlling downlink and uplink gains according to an embodiment of the present invention.
4 is a flowchart illustrating a process of controlling downlink and uplink gains according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted.

The present invention relates to a mobile communication base station and a mobile communication ICS (base station) using a RS (Reference Signal) of LTE or a Common Pilot Channel (WCDMA) signal level of a downlink signal transmitted from a mobile communication base station to a mobile communication terminal, (Interference Cancellation System) relay system, and to secure the coverage by controlling the downlink and uplink gains of the mobile communication ICS (Interference Cancellation System) relay system based on the calculated grounds . In particular, the present invention relates to a mobile communication standard, such as Long Term Evolution (LTE), Long Term Evolution advanced (LTE-A), and Wideband Code (WCDMA), which are proposed through the 3 rd generation asynchronous mobile communication technology standardization organization 3GPP Division Multiple Access).

1 illustrates a configuration of a mobile communication terminal 140 connected to a wireless environment between a mobile communication base station 100 and a mobile communication ICS (Interference Cancellation System) relay system 120 according to an embodiment of the present invention. Fig.

Referring to FIG. 1, it is expressed that a propagation loss generated in a radio environment between a mobile communication base station 100 and a mobile communication ICS (Interference Cancellation System) relay system 120 is calculated. In the mobile communication base station 100, (RSP) (Reference Signal Power) of LTE that does not correlate with the amount of traffic of LTE (Long Term Evolution), WCDMA (Wideband Code Division Multiple Access), or the CPICH (Common Pilot Channel) signal level of WCDMA among the signals transmitted to the terminal 140 And the propagation loss is calculated. A method of calculating the propagation loss generated in a wireless environment is a method of calculating the RSP (Reference Signal Power) of LTE transmitted from the mobile communication base station 100 or the CPICH (Common Pilot Channel) signal level of WCDMA through a donor antenna 110, A reference signal received power (RSRP) of the LTE or a received signal code power (RSCP) signal level of the WCDMA received by the interference cancellation system (ICS) relay system 120 is calculated to calculate the propagation loss. If the downlink and uplink gains are set based on the calculated basis, the coverage of the mobile communication ICS (Interference Cancellation System) relay system 120 is stably secured.

2 is a block diagram illustrating a configuration of a mobile communication BSC 200 according to an exemplary embodiment of the present invention and a mobile communication ICS (Interference Cancellation System) A signal fed back from the service antenna 230 and transmitted to the mobile communication terminal 240 is re-introduced into the donor antenna 210. FIG.

Referring to FIG. 2, it is confirmed that the signal 270 fed back to the content of the propagation loss described in FIG. 1 is added again. In general, a mobile communication ICS (Interference Cancellation System) relay system 220 is developed in consideration of the specificity of an installation environment. The system is amplified in a mobile communication ICS (Interference Cancellation System) relay system 220, And the feedback signal 270 of the signals transmitted to the mobile communication terminal 240 is re-introduced. After being amplified by the mobile communication ICS (Interference Cancellation System) relay system 220, the signal is radiated from the service antenna 230 and then fed back to the mobile communication terminal 240. The signal is fed back to the donor antenna 210, The interference between the mobile communication base station 200 and the mobile communication ICS (Interference Cancellation System) relay system 220 when the signal level of the mobile communication base station 200 is higher than the signal level received from the donor antenna 210 The propagation loss generated in the wireless environment is calculated to be small.

Here, an important matter is the feedback 270 of the signal radiated from the service antenna 230 after being amplified in the mobile communication ICS (Interference Cancellation System) relay system 220 and transmitted to the mobile communication terminal 240, The mobile communication base station 200 transmits the signal level higher than the level received by the mobile communication ICS (Interference Cancellation System) relay system 220. When the input signal is transmitted from the mobile communication base station 100 It is difficult to discriminate whether the signal is a signal or a signal that is amplified after being amplified by the mobile communication ICS (Interference Cancellation System) relay system 220.

Here, the mobile communication ICS (Interference Cancellation System) relay system 220 performs a function of removing the signal level extracted and fed back 270 from the feedback 270.

(Interference Cancellation System) relay system 220 than the level transmitted and received from the mobile communication base station 100 among the signal levels inputted through the donor antenna 210 of the mobile communication ICS (Interference Cancellation System) A signal level difference of the feedback 270 is applied to the calculated propagation loss when the signal level to be fed back to the donor antenna 210 is higher than the feedback level Shall be calculated.

3 is a block diagram schematically illustrating an internal configuration of a mobile communication ICS (Interference Cancellation System) relay system 320 for calculating downlink and uplink gains by calculating a propagation loss according to an embodiment of the present invention.

3, when a long term evolution (LTE) signal source is used, a RSP (Reference Signal Power) signal transmitted from the mobile communication base station 300 is connected to a mobile communication ICS (Interference Cancellation System) relay system 320 Donor antenna 310 and the received RSP signal is transmitted to the modem unit 325 through the duplex # 1 321 of the mobile communication ICS (Interference Cancellation System) relay system. The modem unit 325 extracts a RSP (Reference Signal Power) level transmitted from the mobile communication base station 300 and delivers the extracted data to an MCU (Main Controller Unit) unit 326. The modem unit 325 extracts a reference signal received power (RSRP) level received from the mobile communication ICS (Interference Cancellation System) relay system 320 and transmits the extracted RSRP to the MCU (Main Controller Unit) unit 326. In the downlink ICM unit 322, a signal radiated through the service antenna 330 is fed back and fed back to a donor antenna 310 connected to a mobile communication ICS (Interference Cancellation System) And transmits the level of the signal and the level of the normally input signal to the MCU (Main Controller Unit) unit 326.

The main controller unit 326 calculates the propagation loss using the RSP (Reference Signal Power) level and RSRP (Reference Signal Power Received) level extracted from the modem unit 325 and transmits the downlink ICM Cancellation Module 322 calculates the propagation loss in the case where there is a feedback signal using the level of the feedback signal of the mobile communication ICS (Interference Cancellation System) relay system 320 and the level of the signal normally input.

The MCU (Main Controller Unit) unit 326 calculates the downlink and uplink gains using the calculated propagation loss, and outputs the downlink ICM (Interference Cancellation Module) unit 322 and the downlink amplification unit 323 And sets an uplink gain using an uplink ICM (Interference Cancellation Module) unit 327 and an uplink amplification unit 328.

4 is a flowchart illustrating a process of controlling downlink and uplink gains according to an embodiment of the present invention.

Referring to FIG. 4, an LTE system will be described as an example. When a mobile communication BS is connected to a radio environment between a mobile communication ICS (Interference Cancellation System) relay system, a mobile communication ICS (Interference Cancellation System) (AMP) is set to OFF (421) so that the signal radiated from the service antenna is fed back to the donor antenna so that the RSP (Reference Signal Power) level transmitted from the mobile communication base station can be accurately extracted . The RSP (Reference Signal Power) level transmitted from the mobile communication base station is determined by the maximum power of the mobile communication base station and the service bandwidth (resource block quantity). The mobile communication base station always transmits at a fixed RSP (Reference Signal Power) level.

 In the flowchart, the modem part of the mobile communication ICS (Interference Cancellation System) relay system internal configuration module extracts (422) the BTS_RSP level transmitted from the mobile communication base station. In the modem unit, the RSRP_1 level received in the mobile communication ICS relay system is extracted (423), and the MCU (Main Controller Unit) calculates the radio wave loss occurring in the radio environment between the mobile communication base station and the mobile communication ICS relay system It is stored in the MCU (Main Controller Unit) internal memory.

In order to check whether the signal radiated through the service antenna of the mobile communication ICS (Interference Cancellation System) relay system is fed back and re-introduced through the donor antenna, the downlink amplifier (AMP) is set to ON (424) (425) the received RSRP_2 level in the ICS relay system, and delivers the extracted data to the MCU (Main Controller Unit) unit. The downlink ICM unit extracts the level of the signal fed back from the service antenna connected to the mobile communication ICS relay system and fed back to the donor antenna and the level of the normally input signal to obtain a D / U ratio (Desired Signal / Un desired signal ratio) (426). And transmits the calculated D / U ratio data to the MCU (Main Controller Unit) unit.

In the MCU (Main Controller Unit), the propagation loss is calculated 427 using the extracted data.

Therefore, if the relationship between the BTS_RSP signal level extracted by the modem unit and the RSRP_2 signal level and the D / U ratio calculated by the ICM unit is obtained, the propagation loss can be calculated by the following equation (1).

Equation 1

Propagation loss = BTS_ RSP  - RSRP _2 - D / U ratio

In the MCU section, the downlink gain calculation 428 is applied in the same way as the above propagation loss. In order to perform the uplink gain calculation 428 in the MCU unit, two additional items to be applied should be additionally applied.

First, System Offset: loss of the donor antenna port to the modem part of the mobile communication ICS (Interference Cancellation System) relay system and the thermal noise and noise figure loss generated in the system itself.

Second, Frequency Offset: Application of loss due to frequency deviation in downlink frequency and uplink frequency.

Here, in order to calculate the uplink gain, the relationship between the propagation loss, the system offset, and the frequency offset is obtained.

Equation 2

Upward Gain = Propagation Loss - System Offset - Frequency Offset

Down gain = propagation loss

The calculated downlink and uplink gains are controlled (429) to operate the mobile communication ICS relay system. Here, the mobile communication ICS relay system has an effect of improving the communication quality of the mobile communication terminal by providing stable coverage.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have the knowledge of. Furthermore, although specific terms are used in this specification and the drawings, they are used in a generic sense only to facilitate the description of the invention and to facilitate understanding of the invention, and are not intended to limit the scope of the invention.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

The description sets forth the best mode of the invention, and is provided to illustrate the invention and to enable those skilled in the art to make and use the invention. The written description is not intended to limit the invention to the specific terminology presented. Thus, while the present invention has been described in detail with reference to the above examples, those skilled in the art will be able to make adaptations, modifications, and variations on these examples without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited by the described embodiments but should be defined by the claims.

100/200/300: Mobile communication base station
110/210/310: Donor Antenna
120/220/320: Mobile communication ICS (Interference Cancellation System) relay system
130/230/330: Service antenna
140/240/340: Mobile station (MS)
250: Uplink coverage of mobile communication ICS relay system with propagation loss
260: Uplink coverage of mobile communication ICS relay system applying existing ALC function

Claims (5)

(Reference Signal) level of LTE among the downlink signals transmitted from the mobile communication base station to the mobile communication ICS (Interference Cancellation System) relay system or between the mobile communication base station and the mobile communication ICS (Interference Cancellation System) A modem unit for extracting radio parameters of RSRP (Reference Signal Received Power) of LTE or RSCP (Received Signal Code Power) of WCDMA received at a CPICH (Common Pilot Channel) level and a mobile communication ICS (Interference Cancellation System)
An ICM (Interference Cancellation Module) unit for extracting the level of the fed back signal and the level of the normally input signal and calculating a D / U ratio (Desired Signal / Un desired signal ratio);
An MCU (Main Controller Unit) unit calculates a radio wave loss occurring in a radio environment using radio parameters extracted from the modem unit and a D / U ratio calculated by an ICM (Interference Cancellation Module) unit;
An apparatus for setting the downlink and uplink gains of a mobile communication ICS (Interference Cancellation System) relay system based on data calculated by the MCU (Main Controller Unit) The method according to claim 1,
The wireless parameter includes at least one of a reference signal power (RSP), a reference signal received power (RSRP), a common pilot channel (CPICH), a received signal code power (RSCP), a physical cell identity Wherein the mobile communication ICS repeater system comprises: The apparatus of claim 1, wherein the MCU (Main Controller Unit)
A method of calculating a propagation loss occurring between a mobile communication base station and a mobile communication ICS (Interference Cancellation System) relay system using parameters extracted from a modem unit The apparatus of claim 1, wherein the MCU (Main Controller Unit)
A method of calculating a propagation loss using a parameter extracted by a modem unit and a D / U ratio calculated by an ICM (Interference Cancellation Module) unit.
Propagation loss = BTS_RSP - RSRP_2 - D / U ratio The apparatus of claim 1, wherein the MCU (Main Controller Unit)
Method and apparatus for setting downlink and uplink gains using calculated propagation losses
Upward Gain = Propagation Loss - System Offset - Frequency Offset
Down gain = propagation loss

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