KR20100112329A - Scheduling control system for wireless telecommunication and method thereof - Google Patents

Scheduling control system for wireless telecommunication and method thereof Download PDF

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Publication number
KR20100112329A
KR20100112329A KR1020090030787A KR20090030787A KR20100112329A KR 20100112329 A KR20100112329 A KR 20100112329A KR 1020090030787 A KR1020090030787 A KR 1020090030787A KR 20090030787 A KR20090030787 A KR 20090030787A KR 20100112329 A KR20100112329 A KR 20100112329A
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South Korea
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cell
base station
user terminal
information
uplink
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KR1020090030787A
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Korean (ko)
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KR101568696B1 (en
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김영락
여운영
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세종대학교산학협력단
에스케이 텔레콤주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12Access point controller devices

Abstract

PURPOSE: A wireless communication scheduling control system capable of uplink resource administration is provided to efficiently share the restricted wireless resources by transmitting an uplink load control command to a base station. CONSTITUTION: A base station(200) generates interference power information about a neighbor cell according to path loss information of one or more user terminals(100) on a serving cell. An RNC(Radio Network Controller)(300) determines interference based on interference power information of one or more base stations. An uplink power control about the user terminal requests an uplink power control.

Description

SCHEDULING CONTROL SYSTEM FOR WIRELESS TELECOMMUNICATION AND METHOD THEREOF

The present invention relates to an uplink scheduling method for minimizing inter-cell interference in wireless communication. The present invention relates to an interference level of each neighboring cell based on interference information of a neighboring cell received from a user terminal. The present invention relates to a wireless communication scheduling control system for performing uplink power control in consideration of an uplink load level of a cell, a method thereof, and a base station and a base station controller applied thereto.

In the time division duplexing (TDD) system, since uplink and downlink use the same frequency band, propagation quality of downlink and uplink is almost the same. Therefore, the channel state information of each base station measured by the terminal can be considered to be almost the same as the channel state that the terminal affects each base station.

In this regard, in order to also infer an uplink channel state by downlink quality measurement of the UE, each UE of TD-SCDMA (enhanced random access uplink channel) or E-RUCCH (E-RUCCH) Although path loss information with an adjacent base station is transmitted to a serving base station through an enhanced physical uplink channel (PUCH), a signal transmitted by each terminal can be received by all the base stations around it. That is, in TD-SCDMA, interference effects within a cell can be sufficiently suppressed with the help of a joint detection function and a smart antenna, but inter-cell interference occurring outside the cell is difficult to avoid.

On the other hand, there is a high-speed uplink packet access (HSUPA) technology that can improve the uplink transmission rate up to 2.23Mbps by utilizing the existing TD-SCDMA system scheme, even in the case of the HSUPA technology In order to improve the performance, it is necessary to consider the interference effect as well as the above-described TD-SCDMA system.

However, according to the HSUPA standard does not inform the path loss of all the base stations measured by the terminal. That is, although the path loss ratio reported by the terminal to the base station is defined in the current standard, the actual scheduling scheme for the uplink is not clearly mentioned.

The present invention was created to solve the problems inherent in the prior art as described above, and an object of the present invention is to provide a variety of messages and procedures that can reduce the effects of excessive uplink interference that may occur during high-speed transmission of the terminal. The present invention provides a wireless communication scheduling control system and method for minimizing inter-cell interference, and a base station and a base station controller applied thereto.

According to an aspect of the present invention for achieving the above object, there is provided a wireless communication scheduling control system: the system transmits the path loss information for each of the serving cell (cell) and neighboring cells it is located A user terminal; A base station for calculating and transmitting interference power information for neighboring cells of each user terminal based on the path loss information received from at least one user terminal located on the serving cell; And determining a base station causing interference above a set value in an adjacent cell based on the interference power information received from at least one base station, and requesting uplink power adjustment for a user terminal located in a serving cell of the base station. And a base station controller.

Preferably, the base station calculates the interference power information based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the neighboring cell.

Preferably, the base station, in response to the uplink power control request including the cell identification information for the neighboring cell selects a user terminal causing interference above the set value for the neighboring cell, to the selected user terminal It is characterized by limiting the uplink power for.

According to another aspect of the present invention, there is provided a base station for controlling scheduling for one or more user terminals located on a serving cell: the base station, from which the serving cell and its neighbor cells are located, from which the user terminal is located. An information receiver configured to receive path loss information for each of the path loss information; An information calculating unit which collects the path loss information and calculates interference power information for adjacent cells of each user terminal; A control interlocking unit for transmitting the calculated interference power information to a base station controller and receiving an uplink power adjustment request for the user terminal from the base station controller; And a terminal controller for adjusting uplink power for a user terminal located in the serving cell according to the uplink power adjustment request.

Preferably, the information calculator calculates interference power information of neighboring cells for each user terminal based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and neighboring cells. Characterized in that.

Preferably, the terminal control unit selects a user terminal causing interference above a set value for the neighboring cell according to the uplink power control request including cell identification information of the neighboring cell, and upwards the selected user terminal. It is characterized by adjusting the link power.

According to another aspect of the present invention, there is provided a base station controller that supports scheduling control of a base station: the base station controller, which is a neighbor cell for each user terminal located in the serving cell from one or more base stations managing each serving cell. An information receiving unit for receiving the interference power information for the; A control object selector which calculates inter-cell interference based on the received interference power information and selects a control target base station that causes interference above a set value in an adjacent cell; And a base station controller for requesting uplink power adjustment for the user terminal located in the corresponding serving cell to the control target base station.

Preferably, the information receiving unit receives the interference power information calculated based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cell. It is done.

Preferably, the base station controller transmits an uplink power adjustment request including cell identification information of a neighboring cell to the control target base station to reduce uplink power of a user terminal causing interference above a set value for the neighboring cell. It is characterized by.

Preferably, the base station controller transmits an uplink power adjustment request to the control target base station when the inter-cell interference level of the selected control target base station is less than the set value. And recover power.

According to another aspect of the present invention, there is provided a wireless communication scheduling control system: the system includes an enhanced physical uplink channel (E-PUCH), which is an uplink data transmission channel, and an E-PU, which is an uplink transmission support control channel. Path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the neighboring cell where it is located through an uplink channel including an enhanced random access uplink channel (RUCCH) A user terminal for transmitting the; E-AGCH, which is a downlink control channel for supporting uplink scheduling, calculates and transmits interference power information for neighboring cells for each user terminal based on the path loss information received from at least one user terminal located on the serving cell. a base station for adjusting uplink power for the user terminal through an enhanced absolute grant channel; And a base station controller requesting uplink power adjustment for a user terminal located in a serving cell of the base station by determining a base station causing interference above a set value in a neighboring cell based on the interference power information received from at least one base station. It is characterized by.

Preferably, the base station selects a user terminal causing interference above a set value for the neighboring cell according to the uplink power control request including cell identification information for the neighboring cell, for the selected user terminal It is characterized by limiting uplink power.

According to another aspect of the present invention, there is provided a base station that performs scheduling for one or more user terminals located on a serving cell: the base station, each of the serving cell and the neighbor cell in which it is located from the user terminal. Path Loss information including cell identification information (CID, Cell Identifier) for the E-PUCH (enhanced physical uplink channel), which is an uplink data transmission channel, and E, which is a control channel for uplink transmission support, An information receiver configured to receive an uplink channel including an enhanced random access uplink channel (RUCCH); An information calculating unit which collects the path loss information and calculates interference power information for adjacent cells of each user terminal; A control linkage unit which transmits the calculated interference power information to a base station controller and receives an uplink power control request for the user terminal from the base station controller; And a terminal controller configured to adjust uplink power for a user terminal located in the serving cell through an enhanced absolute grant channel (E-AGCH), which is a downlink control channel according to the uplink power adjustment request. .

Preferably, the terminal controller selects a user terminal causing interference above a set value for the neighboring cell according to the uplink power adjustment request including cell identification information of the neighboring cell. It is characterized by adjusting the uplink power.

According to another aspect of the present invention, there is provided a wireless communication scheduling control method, which includes: information transmission in which a user terminal transmits path loss information for each of a serving cell and an adjacent cell in which a user terminal is located; step; An information transfer step of a base station calculating and transmitting interference power information for an adjacent cell for each user terminal based on the path loss information received from at least one user terminal located on the serving cell; A control object determination step of a base station controller determining a base station causing interference above a set value in an adjacent cell based on the interference power information received from at least one base station; A power adjustment request step of the base station controller requesting uplink power adjustment for a user terminal located in the determined serving cell of the base station; And controlling, by the base station, uplink power for a user terminal located in the serving cell according to the uplink power adjustment request.

Preferably, the information transferring step is characterized in that the interference power information is calculated based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell (Cell) and the adjacent cells. .

Preferably, the terminal control step, the terminal selection step of selecting a user terminal causing interference above the set value for the neighbor cell in response to the uplink power control request including the cell identification information for the neighbor cell; And a power control step of adjusting uplink power for the selected user terminal.

In accordance with another aspect of the present invention, there is provided a method for controlling wireless communication scheduling for one or more user terminals located on a serving cell: the method comprising: each of the serving cell and the neighboring cell in which it is located from the user terminal; An information receiving step of receiving path loss information on the network; An information calculating step of collecting the path loss information to calculate interference power information for neighboring cells of each user terminal; And a terminal control step of adjusting uplink power for a user terminal located in the serving cell according to an uplink power adjustment request of the base station controller based on the calculated interference power information.

Preferably, the information calculating step, based on the path loss information including the cell identification information (CID, Cell Identifier) for each of the serving cell (Cell) and the neighbor cells based on the interference power information for the neighboring cell for each user terminal It is characterized by calculating.

Preferably, the terminal control step, the terminal selection step of selecting a user terminal causing interference above the set value for the neighbor cell in response to the uplink power control request including the cell identification information of the neighbor cell; And a power control step of adjusting uplink power for the selected user terminal.

According to another aspect of the present invention, there is provided a wireless communication scheduling control method for supporting scheduling control of a base station: the method for each user terminal located in a corresponding serving cell from one or more base stations managing each serving cell. An information receiving step of receiving interference power information on an adjacent cell; A control object selection step of calculating an inter-cell interference based on the received interference power information and selecting a control target base station causing interference above a set value in an adjacent cell; And controlling a base station for requesting uplink power adjustment for a user terminal located in a corresponding serving cell to the control target base station.

Preferably, the information receiving step includes receiving the interference power information calculated on the basis of path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cell. It features.

Preferably, the step of controlling the base station, by transmitting the uplink power adjustment request including the cell identification information of the neighbor cell to the control target base station to determine the uplink power of the user terminal causing interference above the set value for the neighbor cell; It is characterized by reducing.

Preferably, the base station controller transmits an uplink power adjustment request to the control target base station when the inter-cell interference level of the selected control target base station is less than the set value. And a power recovery step for recovering power.

According to another aspect of the present invention, there is provided a method for controlling wireless communication scheduling: in which the user terminal is an enhanced physical uplink channel (E-PUCH) and an uplink transmission support control channel, which are uplink data transmission channels. Path loss including cell identification information (CID, Cell Identifier) for each of the serving cell and neighboring cell where it is located through uplink channel including enhanced random access uplink channel (E-RUCCH) An information transmission step of transmitting Loss) information; An information transfer step of a base station calculating and transmitting interference power information for an adjacent cell for each user terminal based on the path loss information received from at least one user terminal located on the serving cell; A control object determination step of a base station controller determining a base station causing interference above a set value in an adjacent cell based on the interference power information received from at least one base station; A power adjustment request step of the base station controller requesting uplink power adjustment for a user terminal located in the determined serving cell of the base station; And adjusting, by the base station, uplink power for a user terminal located in the serving cell through an enhanced absolute grant channel (E-AGCH), which is a downlink control channel for supporting uplink scheduling according to the uplink power adjustment request. It characterized in that it comprises a terminal control step.

Preferably, the terminal control step, the terminal selection step of selecting a user terminal causing interference above the set value for the neighbor cell in response to the uplink power control request including the cell identification information for the neighbor cell; And a power control step of adjusting uplink power for the selected user terminal.

According to another aspect of the present invention, there is provided a method for controlling wireless communication scheduling for one or more user terminals located on a serving cell for one or more user terminals located on a serving cell: the method comprising: positioning itself from the user terminal; Enhanced physical uplink (E-PUCH), which is an uplink data transmission channel, for path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the neighboring cell. receiving information through an uplink channel including an enhanced random access uplink channel (E-RUCCH) and an uplink transmission support control channel; An information calculating step of collecting the path loss information to calculate interference power information for neighboring cells of each user terminal; And a user located in the serving cell through an enhanced absolute grant channel (E-AGCH), which is a downlink control channel, in response to an uplink power adjustment request from the base station controller based on the calculated interference power information. And a terminal control step of adjusting uplink power for the terminal.

Preferably, the terminal control step, the terminal selection step of selecting a user terminal causing interference above the set value for the neighbor cell in response to the uplink power control request including the cell identification information of the neighbor cell; And a power control step of adjusting uplink power for the selected user terminal.

According to a wireless communication scheduling control system and a method thereof, and a base station and a base station controller applied thereto, inter-cell interference is generated based on interference information of a neighbor cell received from a user terminal located in a serving cell. After identifying the base station and transmitting the uplink load control command to the base station to reduce the overall inter-cell interference of the network, a plurality of terminals can efficiently share limited radio resources, and more precise uplink resource management is possible. .

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic block diagram of a wireless communication scheduling control system according to an embodiment of the present invention.

As shown in FIG. 1, the system includes an interference for a neighbor cell based on the user terminal 100 transmitting path loss information for each of a serving cell and neighbor cells and the path loss information. And a base station controller 300 for requesting uplink power adjustment for the user terminal 100 to the base station 200 based on the base station 200 for calculating power information and the interference power information. Have

The user terminal 100 transmits path loss information for each of a serving cell and an adjacent cell in which the user terminal 100 is located. More specifically, the user terminal 100 transmits path loss information including cell identification information (CID, Cell Identifier) for the serving cell and the neighbor cell to the base station 200. In this case, the path loss information of the neighbor cell refers to the path loss information of the neighbor cell that the user terminal 100 has the greatest interference effect. On the other hand, when the configuration of the present application is applied to the Time Division Duplexing (TDD) -based high-speed uplink packet access (HSUPA) technology, the user terminal 100 transmits uplink (Uplink) data Cell identification information for each serving cell and neighboring cell in which it is located through an enhanced physical uplink channel (E-PUCH) or an enhanced random access uplink channel (E-RUCCH) that is an uplink transmission support control channel. Path loss information including CID (Cell Identifier) is transmitted to the base station 200.

The base station 200 calculates the interference power information for the neighbor cells of each user terminal 100 based on the path loss information received from the user terminal 100 and transmits the interference power information to the base station controller 300. More specifically, the base station 200 is a cell for the serving cell and neighbor cells received from one or more user terminals 100 located on the serving cell periodically or event-triggered. The interference power information is calculated by collecting path loss information including identification information (CID, Cell Identifier). Here, the interference power (I J ) of the user terminal 100 located in the serving cell to the neighboring base station, for example, the base station J can be expressed through Equation 1 as follows.

[Equation 1]

Figure 112009021428471-PAT00001

Here, S (J) means a set of terminals having the smallest path loss with the base station J among the user terminals belonging to the serving cell. As can be seen from this equation, the interference power (I J ) can be obtained by using a value measured in the serving cell or reported from the user terminal 100.

Meanwhile, in the case of the base station 200 supporting the TDD-based high-speed uplink packet access (HSUPA) technology, the background noise is a value obtained by dividing the total received power received by the base station by the background noise power. Scheduling of the user terminal present in the serving cell is performed using a noise rise over thermal noise (ROT) parameter. That is, the transmission power of each terminal is adjusted so that the ROT does not exceed a certain limit. In this regard, the base station 200 transmits the ROT information together with the interference power information for the adjacent cells for each user terminal 100 calculated based on the path loss information received from the user terminal 100.

Furthermore, the base station 200 in response to the uplink power control request including the cell identification information for the neighbor cell received from the base station controller 300 causes the user terminal 100 to cause interference beyond the set value for the neighbor cell. ) To limit uplink power for the selected user terminal. More specifically, the base station 200 receives a user terminal 100 that causes interference beyond the set value for the adjacent cell in response to receiving an uplink power control request including cell identification information of the neighboring cell from the base station controller 300. Selectively reduces uplink power. In addition, the base station 200 receives the uplink power control request from the base station controller 200 and reduces the user terminal 100 as the inter-cell interference of the selected control target base station is reduced to less than the set value. Restore uplink power for. On the other hand, when the configuration of the present application is applied to a high-speed uplink packet access (HSUPA) technology based on Time Division Duplexing (TDD) scheme, the base station 200 is a downlink for supporting uplink scheduling The uplink power for the user terminal is controlled through an enhanced absolute grant channel (E-AGCH), which is a control channel.

The base station controller 300 determines a base station causing interference above a set value in an adjacent cell based on the interference power information received from the one or more base stations 200, and determines an uplink for a user terminal located in a serving cell of the corresponding base station. Up Link) Request power control. More specifically, the base station controller 300 transmits an uplink power adjustment request including cell identification information of a neighboring cell to the control target base station to generate uplink power of a user terminal causing interference above a set value for the neighboring cell. Decrease. Furthermore, the base station controller 300 transmits an uplink power adjustment request to the control target base station when the inter-cell interference of the selected control target base station is reduced to less than the set value. Restores the uplink power of the user equipment to normal.

As described above, according to the wireless communication scheduling system according to an embodiment of the present invention, the base station 200 bases the interference level on each neighboring cell on the basis of the interference information on the neighboring cell received from the user terminal 100. Report to the controller 300, the base station controller 300 identifies the base station causing the inter-cell interference based on the uplink load level of each cell and then transmits the uplink load control command to the base station to the overall inter-cell interference of the network Can be reduced.

Hereinafter, a detailed configuration of the base station 200 according to the embodiment of the present invention will be described with reference to FIG. 2.

As shown in FIG. 2, an information receiver 210 for receiving path loss information, an information calculator 220 for calculating interference power information for an adjacent cell for each user terminal, and the calculated interference power information Is transmitted to the base station controller 300, the control interlocking unit 230 for receiving an uplink (uplink) power adjustment request for the user terminal from the base station controller 300, and the uplink for the user terminal 100 It has a configuration that includes a terminal control unit 240 for adjusting the power for.

The information receiver 210 receives path loss information for each of the serving cell and the neighboring cell in which the information is received from the user terminal 100. More specifically, the information receiving unit 210 receives from the user terminal 100 path loss information including cell serving information and cell identification information (CID, Cell Identifier) for the adjacent cell. On the other hand, when the configuration of the present application is applied to the Time Division Duplexing (TDD) -based high-speed uplink packet access (HSUPA) technology, the information receiving unit 210 transmits uplink (Uplink) data For each of the serving cell and the neighbor cell where the user terminal 100 is located through an enhanced physical uplink channel (E-PUCH) or an enhanced random access uplink channel (E-RUCCH) that is an uplink transmission support control channel. Path Loss information including cell identification information (CID) is received.

The information calculator 220 collects the path loss information and calculates interference power information for neighbor cells of each user terminal. More specifically, the information calculator 220 may be configured to serve and receive adjacent cells from one or more user terminals 100 located on the serving cell periodically or event-triggered. The interference power information is calculated by collecting path loss information including cell identification information (CID, Cell Identifier).

Meanwhile, in the case of the base station 200 supporting the TDD-based high-speed uplink packet access (HSUPA) technology, the background noise is a value obtained by dividing the total received power received by the base station by the background noise power. Scheduling of the user terminal present in the serving cell is performed using a noise rise over thermal noise (ROT) parameter. Therefore, the control interlocking unit 230 transmits ROT information along with interference power information of neighbor cells of each user terminal 100 calculated based on the path loss information received from the user terminal 100.

 The terminal controller 240 causes the user terminal 100 to cause interference beyond the set value for the neighbor cell according to the uplink power control request including the cell identification information for the neighbor cell received from the base station controller 300. Select to limit the uplink power for the selected user terminal. More specifically, the terminal controller 240 receives an uplink power control request including cell identification information of the neighbor cell from the base station controller 300, causing the user terminal 100 to cause interference beyond the set value for the neighbor cell. Select to reduce the uplink power. In addition, the terminal controller 240 receives the uplink power adjustment request from the base station controller 200 as the inter-cell interference of the selected control target base station is reduced to less than the set value of the user terminal ( Restore uplink power for 100). On the other hand, when the configuration of the present application is applied to the Time Division Duplexing (TDD) -based high-speed uplink packet access (HSUPA, High-Speed Uplink Packet Access) technology, the terminal control unit 240 is a downlink for supporting uplink scheduling The uplink power for the user terminal 100 is controlled through an enhanced absolute grant channel (E-AGCH), which is a link control channel.

As described above, according to the configuration of the base station 100 according to the embodiment of the present invention, the base station 200 based on the interference information on the neighbor cell received from the user terminal 100, the interference level for each neighbor cell. By reporting to the base station controller 300, and identifying the user terminal causing the inter-cell interference on the serving cell, and then controls the uplink power, it is possible to reduce the overall inter-cell interference of the network.

Hereinafter, a configuration of a base station controller 300 according to an embodiment of the present invention will be described with reference to FIG. 3.

As shown in FIG. 3, the base station controller 300 includes an information receiver 310 for receiving interference power information from the base station 200, a control target selector 320 for selecting a control target base station, and a control target base station. The base station controller 330 for requesting uplink power adjustment for the user terminal has a configuration.

The information receiver 310 receives interference power information on neighbor cells of user terminals 100 located in the serving cell from one or more base stations 200 managing each serving cell. More specifically, the information receiving unit 310 is based on the base station 200 by the interference power information calculated on the basis of the path loss information (Path Loss) information including the cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cells. From).

The control target selector 320 calculates inter-cell interference based on the received interference power information and selects a control target base station that causes interference above a set value in an adjacent cell.

The base station controller 330 requests uplink power adjustment for the user terminal located in the serving cell to the control target base station. More specifically, the base station controller 330 transmits an uplink power adjustment request including cell identification information of a neighboring cell to the control target base station to generate uplink power of a user terminal causing interference above a set value for the neighboring cell. Decrease. Further, when the inter-cell interference of the selected neighboring cell of the selected control target base station is reduced to less than the set value due to the movement of the user terminal 100 or the change in the radio environment, the base station controller 300 may include: By transmitting an uplink power adjustment request to the control target base station to restore the reduced uplink power of the user terminal to normal.

As described above, according to the configuration of the base station controller 300 according to an embodiment of the present invention, based on the uplink load level of each cell determined based on the interference level of each neighboring cell received from the base station 200. After identifying the base station causing the inter-cell interference, the uplink load control command is transmitted to the base station to reduce the overall inter-cell interference of the network.

Hereinafter, a wireless communication scheduling control method according to an embodiment of the present invention will be described with reference to FIGS. 4 to 6. Here, for the convenience of description, the configuration shown in FIGS. 1 to 3 will be described with reference to the corresponding reference numerals.

First, a driving method of a wireless communication scheduling system according to an embodiment of the present invention will be described with reference to FIG. 4.

First, the user terminal 100 transmits path loss information for each of a serving cell and an adjacent cell in which the user terminal 100 is located (S110). Preferably, the user terminal 100 transmits the path loss information including the cell identification information (CID, Cell Identifier) for the serving cell (Cell) and the neighbor cell to the base station (200). In this case, the path loss information of the neighbor cell refers to the path loss information of the neighbor cell that the user terminal 100 has the greatest interference effect. On the other hand, when the configuration of the present application is applied to the high-speed uplink packet access (HSUPA) technology based on Time Division Duplexing (TDD) method, the user terminal 100 is uplink (Up Link) data Cell identification information for each serving cell and neighboring cell in which it is located through an enhanced physical uplink channel (E-PUCH) or an enhanced random access uplink channel (E-RUCCH) that is an uplink transmission support control channel Path Loss information including (CID, Cell Identifier) is transmitted to the base station 200.

Then, the base station 200 calculates the interference power information for the neighbor cell for each user terminal based on the path loss information received from the at least one user terminal 100 located on the serving cell (S120). Preferably, the cell for the serving cell and the neighboring cell is received from one or more user terminal 100 located on the serving cell periodically or event-triggered base station 200 The interference power information is calculated by collecting path loss information including identification information (CID, Cell Identifier).

Then, the base station 200 transmits the ROT information together with the interference power information for the adjacent cells for each user terminal 100 calculated based on the path loss information received from the user terminal 100 (S130).

Next, the base station controller 300 determines the base station 200 causing the interference above the set value in the adjacent cell based on the interference power information received from the at least one base station 200 (S140).

Then, the base station controller 300 requests an uplink power adjustment for the user terminal located in the determined serving cell of the base station 200 (S150). The base station controller 300 transmits an uplink power adjustment request including cell identification information of a neighboring cell to the control target base station and requests a reduction of uplink power of a user terminal causing interference above a set value for the neighboring cell. .

Thereafter, the base station 200 adjusts uplink power for the user terminal located in the serving cell according to the uplink power adjustment request (S160-S170). Preferably, a user terminal causing the base station 200 to cause interference beyond a set value for the neighboring cell in response to the uplink power control request including cell identification information for the neighboring cell received from the base station controller 300 ( 100) to limit the uplink power for the selected user terminal. On the other hand, when the configuration of the present application is applied to a high-speed uplink packet access (HSUPA) technology based on Time Division Duplexing (TDD) scheme, the base station 200 is a downlink for supporting uplink scheduling The uplink power for the user terminal is controlled through an enhanced absolute grant channel (E-AGCH), which is a control channel.

Further, the driving operation of the system through the above-described step 'S110-S170' is continuously repeated. That is, the base station controller 300, when the inter-cell interference of the neighboring cell of the selected control target base station is reduced to less than the set value due to the movement of the user terminal 100 or the radio environment changes, uplink The power control request is transmitted to the control target base station to restore the reduced uplink power of the user terminal to normal (S180-S240).

As described above, according to the driving method of the wireless communication scheduling system according to the embodiment of the present invention, the base station 200 based on the interference information for the neighbor cell received from the user terminal 100 for the interference for each neighbor cell The level is reported to the base station controller 300, and the base station controller 300 identifies a base station causing intercell interference based on the uplink load level of each cell, and then transmits an uplink load control command to the corresponding base station. Overall intercell interference can be reduced.

Hereinafter, a driving method of the base station 200 for wireless communication scheduling control will be described with reference to FIG. 5.

First, path loss information for each of the serving cell and the adjacent cell in which the user is located is received from the user terminal (S310). Preferably, the information receiver 210 receives path loss information for each of the serving cell and the neighboring cell in which the information is received from the user terminal 100. More specifically, the information receiving unit 210 receives from the user terminal 100 path loss information including cell serving information and cell identification information (CID, Cell Identifier) for the adjacent cell. On the other hand, when the configuration of the present application is applied to the Time Division Duplexing (TDD) -based high-speed uplink packet access (HSUPA) technology, the information receiving unit 210 transmits uplink (Uplink) data For each of the serving cell and the neighbor cell where the user terminal 100 is located through an enhanced physical uplink channel (E-PUCH) or an enhanced random access uplink channel (E-RUCCH) that is an uplink transmission support control channel. Path Loss information including cell identification information (CID) is received.

Thereafter, the path loss information is collected to calculate interference power information for neighbor cells of each user terminal (S320-S330). Preferably, the information calculator 220 collects the path loss information to calculate the interference power information for the adjacent cell for each user terminal. More specifically, the information calculator 220 may be configured to serve and receive adjacent cells from one or more user terminals 100 located on the serving cell periodically or event-triggered. The interference power information is calculated by collecting path loss information including cell identification information (CID, Cell Identifier).

Then, the ROT information is transmitted together with the interference power information for the neighboring cell for each user terminal 100 calculated based on the path loss information received from the user terminal 100 (S340-S350). Preferably, the base station controller 300 provides the ROT information along with the interference power information for the neighbor cells of each user terminal 100 calculated based on the path loss information received from the user terminal 100. To send.

Then, the uplink power for the user terminal located in the serving cell is adjusted according to the uplink power adjustment request of the base station controller based on the calculated interference power information (S360-S390). Preferably, the user terminal causing the terminal controller 240 to cause interference beyond the set value for the neighbor cell in response to the uplink power control request including the cell identification information for the neighbor cell received from the base station controller 300 Selecting 100 limits the uplink power for the selected user terminal. More specifically, the terminal controller 240 receives an uplink power control request including cell identification information of the neighbor cell from the base station controller 300, causing the user terminal 100 to cause interference beyond the set value for the neighbor cell. Select to reduce the uplink power. On the other hand, when the configuration of the present application is applied to the Time Division Duplexing (TDD) -based high-speed uplink packet access (HSUPA, High-Speed Uplink Packet Access) technology, the terminal control unit 240 is a downlink for supporting uplink scheduling The uplink power for the user terminal 100 is controlled through an enhanced absolute grant channel (E-AGCH), which is a link control channel.

Furthermore, the driving operation of the system through the above-described step 'S310-S390' is continuously repeated. That is, when the terminal control unit 240 reduces the inter-cell interference with respect to the neighboring cell of the selected control target base station due to the movement of the user terminal 100 or the radio environment change, the uplink power control The request is received from the base station controller 300 to restore the reduced uplink power of the user terminal to normal (S400-S480).

As described above, according to the driving method of the base station 100 according to the embodiment of the present invention, the base station 200 based on the interference information of the neighbor cell received from the user terminal 100 for each neighbor cell interference By reporting the level to the base station controller 300, identifying the user terminal causing intercell interference on the serving cell, and controlling uplink power, the overall intercell interference of the network can be reduced.

Finally, a method of driving the base station controller 300 for wireless communication scheduling control will be described with reference to FIG. 6.

First, at least one base station managing each serving cell receives interference power information on neighbor cells for each user terminal located in the corresponding serving cell (S510). Preferably, the information receiving unit 310 receives the interference power information for the neighboring cell for each user terminal 100 located in the serving cell from one or more base stations 200 managing each serving cell (Cell). More specifically, the information receiving unit 310 is based on the base station 200 by the interference power information calculated on the basis of the path loss information (Path Loss) information including the cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cells. From).

Thereafter, inter-cell interference is calculated based on the received interference power information, and a control target base station that causes interference above a set value is selected in an adjacent cell (S520-S530). Preferably, the control target selector 320 calculates the inter-cell interference based on the received interference power information and selects the control target base station causing the interference above the set value in the adjacent cell.

Thereafter, the control target base station requests uplink power adjustment for the user terminal located in the corresponding serving cell (S540-S550). Preferably, the base station controller 330 requests the control target base station to adjust the uplink power for the user terminal located in the serving cell. More specifically, the base station controller 330 transmits an uplink power adjustment request including cell identification information of a neighbor cell to the control target base station, causing uplink power of a user terminal causing interference above a set value for the neighbor cell. Decreases.

Furthermore, the driving operation of the system through the above-described step 'S510-S550' is continuously repeated. That is, the base station controller 330, when the inter-cell interference of the neighboring cell of the selected control target base station is reduced to less than the set value due to the movement of the user terminal 100 or the radio environment changes, uplink power The adjustment request is transmitted to the control target base station to restore the reduced uplink power of the user terminal to normal (S560-S600).

As described above, according to the driving method of the base station controller 300 according to the embodiment of the present invention, the uplink load level of each cell determined based on the interference level of each neighboring cell received from the base station 200 is determined. After identifying the base station causing the inter-cell interference based on the uplink load control command to the base station can reduce the overall inter-cell interference of the network.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

According to the present invention, a radio communication scheduling control system and method thereof, and a base station and a base station controller applied thereto, generate inter-cell interference based on interference information of a neighbor cell received from a user terminal located in a serving cell. As it overcomes the limitations of the existing technology in identifying uplink base station and transmitting uplink load control command to the base station, not only the use of related technology but also the possibility of commercialization or sales of the applied device is not only practical but also realistically. It is an invention with industrial applicability, since it can be clarified.

1 is a schematic structural diagram of a wireless communication scheduling control system according to an embodiment of the present invention;

2 is a schematic structural diagram of a user terminal according to an embodiment of the present invention;

3 is a schematic structural diagram of a base station according to another embodiment of the present invention;

4 to 6 are flowcharts for explaining a wireless communication scheduling control method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: user terminal

200: base station

210: information receiver 220: information calculator

230: control interlocking unit 240: terminal control unit

300: base station controller

310: information receiving unit 320: control target selection unit

330: base station controller

Claims (28)

  1. In the wireless communication scheduling control system,
    A user terminal transmitting path loss information for each of a serving cell and an adjacent cell in which the cell is located;
    A base station for calculating and transmitting interference power information for neighboring cells of each user terminal based on the path loss information received from at least one user terminal located on the serving cell; And
    A base station for determining an base station causing interference above a set value in an adjacent cell based on the interference power information received from at least one base station, and requesting uplink power adjustment for a user terminal located in a serving cell of the base station. A wireless communication scheduling control system comprising a controller.
  2. The method of claim 1, wherein the base station,
    And calculating the interference power information based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cell.
  3. The method of claim 2, wherein the base station,
    Limiting uplink power for the selected user terminal by selecting a user terminal causing interference above a set value for the neighboring cell according to the uplink power adjustment request including cell identification information for the neighboring cell; Wireless communication scheduling control system characterized in that.
  4. A base station for controlling scheduling for one or more user terminals located on a serving cell,
    An information receiver configured to receive path loss information for each of the serving cell and the neighboring cell in which the user terminal is located from the user terminal;
    An information calculating unit which collects the path loss information and calculates interference power information for adjacent cells of each user terminal;
    A control interlocking unit for transmitting the calculated interference power information to a base station controller and receiving an uplink power adjustment request for the user terminal from the base station controller; And
    And a terminal controller configured to adjust uplink power for a user terminal located in the serving cell according to the uplink power adjustment request.
  5. The method of claim 4, wherein the information calculating unit,
    The base station of claim 1, wherein the interference power information for the neighboring cell for each user terminal is calculated based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the neighboring cell.
  6. The method of claim 5, wherein the terminal control unit,
    According to the uplink power adjustment request including the cell identification information of the neighboring cell, the user terminal causing interference above the set value for the neighboring cell is selected, and the uplink power for the selected user terminal is controlled. Base station.
  7. A base station controller supporting scheduling control of a base station,
    An information receiver configured to receive interference power information of neighboring cells for each user terminal located in the corresponding serving cell from at least one base station managing each serving cell;
    A control object selector which calculates inter-cell interference based on the received interference power information and selects a control target base station that causes interference above a set value in an adjacent cell; And
    And a base station controller for requesting uplink power adjustment for a user terminal located in a corresponding serving cell to the control target base station.
  8. The method of claim 7, wherein the information receiving unit,
    And receiving the interference power information calculated on the basis of path loss information including cell identification information (CID) for each of the serving cell and the neighboring cell.
  9. The method of claim 8, wherein the base station control unit,
    And transmitting an uplink power control request including cell identification information of a neighboring cell to the control target base station to reduce uplink power of a user terminal causing interference above the set value for the neighboring cell.
  10. The method of claim 9, wherein the base station control unit,
    When the inter-cell interference degree of the selected control target base station for the neighboring cell is less than the set value, the base station, characterized in that for transmitting the uplink power control request to the control target base station to restore the reduced uplink power of the user terminal Controller.
  11. In the wireless communication scheduling control system,
    Serving where the user is located through an uplink channel including an enhanced physical uplink channel (E-PUCH), an uplink data transmission channel, and an enhanced random access uplink channel (E-RUCCH), an uplink transmission support control channel. A user terminal transmitting path loss information including cell identification information (CID) for each of a cell and an adjacent cell;
    E-AGCH, which is a downlink control channel for supporting uplink scheduling, calculates and transmits interference power information for neighboring cells for each user terminal based on the path loss information received from at least one user terminal located on the serving cell. a base station for adjusting uplink power for the user terminal through an enhanced absolute grant channel; And
    And determining a base station causing interference above a set value in a neighbor cell based on the interference power information received from at least one base station, and requesting uplink power adjustment for a user terminal located in a serving cell of the base station. Wireless communication scheduling control system characterized in that.
  12. The method of claim 11, wherein the base station is
    Limiting uplink power for the selected user terminal by selecting a user terminal causing interference above a set value for the neighbor cell according to the uplink power adjustment request including cell identification information for the neighbor cell; Wireless communication scheduling control system characterized in that.
  13. In the base station for scheduling the one or more user terminals located on the serving cell,
    Path Loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cell in which the user terminal is located is an uplink data transmission channel. An information receiver configured to receive an uplink channel including an enhanced physical uplink channel (E-PUCH) and an enhanced random access uplink channel (E-RUCCH) that is an uplink transmission support control channel;
    An information calculating unit which collects the path loss information and calculates interference power information for adjacent cells of each user terminal;
    A control interlocking unit for transmitting the calculated interference power information to a base station controller and receiving an uplink power adjustment request for the user terminal from the base station controller; And
    And a base station control unit configured to adjust uplink power for a user terminal located in the serving cell through an enhanced absolute grant channel (E-AGCH), which is a downlink control channel according to the uplink power adjustment request. .
  14. The method of claim 13, wherein the terminal control unit,
    In response to the uplink power adjustment request including cell identification information of the neighboring cell, the user terminal causing interference above the set value for the neighboring cell is selected, and the uplink power for the selected user terminal is adjusted. Base station.
  15. In the wireless communication scheduling control method,
    An information transmission step of transmitting, by the user terminal, path loss information for each of a serving cell and an adjacent cell in which the user terminal is located;
    An information transfer step of a base station calculating and transmitting interference power information for an adjacent cell for each user terminal based on the path loss information received from at least one user terminal located on the serving cell;
    A control object determination step of a base station controller determining a base station causing interference above a set value in an adjacent cell based on the interference power information received from at least one base station;
    A power adjustment request step of the base station controller requesting uplink power adjustment for a user terminal located in the determined serving cell of the base station; And
    And controlling, by the base station, uplink power for a user terminal located in the serving cell according to the uplink power adjustment request.
  16. The method of claim 15, wherein the information transferring step,
    And calculating the interference power information based on path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cell.
  17. The method of claim 16, wherein the terminal control step,
    A terminal selection step of selecting a user terminal causing interference above a set value for the neighbor cell according to the uplink power regulation request including cell identification information for the neighbor cell; And
    And a power control step of adjusting uplink power for the selected user terminal.
  18. In the wireless communication scheduling control method for at least one user terminal located on a serving cell,
    An information receiving step of receiving path loss information for each of the serving cell and the adjacent cell in which the user terminal is located from the user terminal;
    An information calculating step of collecting the path loss information to calculate interference power information for neighboring cells of each user terminal; And
    And a terminal control step of adjusting uplink power for a user terminal located in the serving cell according to an uplink power adjustment request of the base station controller based on the calculated interference power information. .
  19. The method of claim 18, wherein the information calculating step,
    Wireless communication scheduling control comprising calculating interference power information for neighboring cells for each user terminal based on path loss information including cell identification information (CID) for each of the serving cell and the neighboring cell Way..
  20. The method of claim 19, wherein the terminal control step,
    A terminal selection step of selecting a user terminal causing interference above a set value for the neighboring cell according to the uplink power regulation request including cell identification information of the neighboring cell; And
    And a power control step of adjusting uplink power for the selected user terminal.
  21. A wireless communication scheduling control method for supporting scheduling control of a base station,
    An information receiving step of receiving interference power information on neighboring cells for each user terminal located in the serving cell from at least one base station managing each serving cell;
    A control object selection step of calculating an inter-cell interference based on the received interference power information and selecting a control target base station causing interference above a set value in an adjacent cell;
    And controlling a base station to request uplink power adjustment for a user terminal located in a corresponding serving cell to the control target base station.
  22. The method of claim 21, wherein the information receiving step,
    And receiving the interference power information calculated on the basis of path loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the neighboring cell.
  23. The method of claim 22, wherein the base station control step,
    Wireless communication scheduling control, characterized by reducing the uplink power of the user terminal causing interference above the set value for the neighboring cell by transmitting an uplink power adjustment request including cell identification information of the neighboring cell to the control target base station. Way.
  24. The method of claim 23, wherein the base station control unit,
    When the inter-cell interference degree of the selected control target base station for the neighboring cell is less than the set value, the power recovery step of transmitting the uplink power control request to the control target base station to restore the reduced uplink power of the user terminal further; Wireless communication scheduling control method comprising a.
  25. In the wireless communication scheduling control method,
    Serving where the user is located through an uplink channel including an enhanced physical uplink channel (E-PUCH), an uplink data transmission channel, and an enhanced random access uplink channel (E-RUCCH), an uplink transmission support control channel. An information transmission step of transmitting path loss information including cell identification information (CID) for each of a cell and an adjacent cell;
    An information transfer step of a base station calculating and transmitting interference power information for an adjacent cell for each user terminal based on the path loss information received from at least one user terminal located on the serving cell;
    A control object determination step of a base station controller determining a base station causing interference above a set value in an adjacent cell based on the interference power information received from at least one base station;
    A power adjustment request step of the base station controller requesting uplink power adjustment for a user terminal located in the determined serving cell of the base station; And
    The base station adjusts uplink power for a user terminal located in the serving cell through an enhanced absolute grant channel (E-AGCH), which is a downlink control channel for supporting uplink scheduling according to the uplink power adjustment request. And a terminal control step.
  26. The method of claim 25, wherein the terminal control step,
    A terminal selection step of selecting a user terminal causing interference above a set value for the neighbor cell according to the uplink power adjustment request including cell identification information for the neighbor cell; And
    And a power control step of adjusting uplink power for the selected user terminal.
  27. A method of controlling wireless communication scheduling for one or more user terminals located on a serving cell for one or more user terminals located on a serving cell,
    Path Loss information including cell identification information (CID, Cell Identifier) for each of the serving cell and the adjacent cell in which the user terminal is located is an uplink data transmission channel. Receiving information through an uplink channel including an enhanced physical uplink channel (E-PUCH) and an enhanced random access uplink channel (E-RUCCH) that is an uplink transmission support control channel;
    An information calculating step of collecting the path loss information to calculate interference power information for neighboring cells of each user terminal; And
    A user terminal located in the serving cell through an enhanced absolute grant channel (E-AGCH), which is a downlink control channel, in response to an uplink power adjustment request from the base station controller based on the calculated interference power information. And a terminal control step of adjusting uplink power for the wireless communication scheduling.
  28. The method of claim 27, wherein the terminal control step,
    A terminal selection step of selecting a user terminal causing interference above a set value for the neighboring cell according to the uplink power regulation request including cell identification information of the neighboring cell; And
    And a power control step of adjusting uplink power for the selected user terminal.
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Cited By (4)

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WO2012115362A2 (en) * 2011-02-22 2012-08-30 Lg Electronics Inc. Method of controlling uplink transmission power at ue in wireless communication system and apparatus thereof
WO2013137635A1 (en) * 2012-03-14 2013-09-19 삼성전자 주식회사 Method and apparatus for controlling uplink transmission power of user equipment 단말의 상향 링크 송신 전력을 제어하는 방법 및 장치
KR101332025B1 (en) * 2012-01-20 2013-11-25 경상대학교산학협력단 Method for user scheduling considering inter-cell interference and wireless mobile communication system
WO2014038842A1 (en) * 2012-09-04 2014-03-13 엘지전자 주식회사 Method for measuring interference of neighboring base station in wireless communication system and method for supporting interference measurement

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Publication number Priority date Publication date Assignee Title
KR100876715B1 (en) 2006-08-24 2008-12-31 삼성전자주식회사 Reverse power control method and apparatus in a communication system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012115362A2 (en) * 2011-02-22 2012-08-30 Lg Electronics Inc. Method of controlling uplink transmission power at ue in wireless communication system and apparatus thereof
WO2012115362A3 (en) * 2011-02-22 2012-10-18 Lg Electronics Inc. Method of controlling uplink transmission power at ue in wireless communication system and apparatus thereof
US9179419B2 (en) 2011-02-22 2015-11-03 Lg Electronics Inc. Method of controlling uplink transmission power at UE in wireless communication system and apparatus thereof
KR101332025B1 (en) * 2012-01-20 2013-11-25 경상대학교산학협력단 Method for user scheduling considering inter-cell interference and wireless mobile communication system
WO2013137635A1 (en) * 2012-03-14 2013-09-19 삼성전자 주식회사 Method and apparatus for controlling uplink transmission power of user equipment 단말의 상향 링크 송신 전력을 제어하는 방법 및 장치
US9294971B2 (en) 2012-03-14 2016-03-22 Samsung Electronics Co., Ltd Method and apparatus for controlling uplink transmission power of user equipment
WO2014038842A1 (en) * 2012-09-04 2014-03-13 엘지전자 주식회사 Method for measuring interference of neighboring base station in wireless communication system and method for supporting interference measurement
US9794813B2 (en) 2012-09-04 2017-10-17 Lg Electronics Inc. Method for measuring interference of neighboring base station in wireless communication system and method for supporting interference measurement

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