KR20100018779A - Method and system for scheduling a mobile communication service - Google Patents

Abstract

PURPOSE: A method and a system for scheduling a mobile communication service are provided to adjust an offset value of scheduling information, thereby preventing performance deterioration of a mobile communication service in a huge building. CONSTITUTION: RAS(Radio Access Station)s(130~134) convert transmission data into RF signals and transmit the converted data. The RASs measure levels of interference signals to transmit interference signal information. An ACR(Access Control Router)(120) generates an interference group. The ACR sets scheduling information for each RAS and transmits it.

Description

Mobile communication service scheduling system and method {Method and system for scheduling a mobile communication service}

The present invention relates to a mobile communication service scheduling system and method, and more particularly, a small base station (RAS) is installed in each floor in a large building composed of a plurality of floors, and the small base stations of each floor are connected to the base station manager (ACR). In the state connected to the core network through the small network, each small base station measures the interference signal level of the neighboring cell and transmits it to the base station manager, based on the offset and zone for each small base station from the base station manager The present invention relates to a mobile communication service scheduling system and method for setting up and transmitting the information to each small base station so that the small base stations perform zone-based scheduling based on the offset.

In general, a mobile communication service transmits a radio frequency (RF) signal from a base station, and a user receives a radio signal through a mobile communication terminal.

However, in a large city where large buildings are concentrated, when a user is located inside the building, a wireless signal transmitted from a base station may be diffracted by many buildings and thus may not be well received by a user's mobile communication terminal. .

That is, there is a problem that system performance is not sufficient to cover indoors with a macro type base station serving a wide area outdoors. In order to solve this problem, small base stations of the form of femto cells have been recently developed. Through this, a mobile access building service is installed through a radio access station (RAS), which is a small base station, in a large building. Providing.

However, when a large number of small base stations of femtocells are installed inside a building for such mobile communication in-building services, interference problems between femtocells or between femtocells and external base stations occur very seriously, causing performance deterioration at the cell-to-cell boundary. . That is, when a lot of RAS is installed in the building, the data transmitted from any RAS is broken by interference due to the transmission of the adjacent RAS.

In order to solve this problem, the frequency bands between adjacent cells may be solved differently, but in this case, the number of usable frequency bands is reduced, resulting in a deterioration in overall performance.

In order to solve the above problems, the present invention is a small base station (RAS) is installed in each floor in a large building consisting of a plurality of floors, the small base stations of each floor through the base station manager (ACR) Core Network (Core Network) In the state connected to each base station, each small base station measures the interference signal level of the neighboring cell and transmits it to the base station manager, and based on this, the base station manager sets the offset and zone for each small base station to each small base station. It is an object of the present invention to provide a mobile communication service scheduling system and method for transmitting, by each small base station to perform the zone-based scheduling based on the offset.

The mobile communication service scheduling system according to the present invention for achieving the above object is a radio access station that converts and transmits the transmission data to the RF signal, and measures the level of the interference signal from the neighboring cell to transmit the interference signal information ( RAS); Receiving the transmission data from the core network and transmitting the received data to the radio access station, and generating interference groups between cells having an interference signal level of a predetermined level or higher for the interference signal information transmitted from the radio access station (RAS), An access controller (ACR) for setting scheduling information for each radio access station (RAS) belonging to the interference group and transmitting the same to the radio access station (RAS), wherein the radio access station (RAS) is based on the scheduling information. The transmission data is scheduled.

The scheduling information may include an offset value and zone information of the OFDMA downlink symbol for each radio access station (RAS), and the offset value is represented by a symbol start number. The zone information is represented by the number of symbols.

In addition, the offset value and the zone information are set in consideration of the number of users or quality of service (QoS) level for each radio access station (RAS).

In addition, the radio access station (RAS) obtains the signal strength of the preamble-based signal received from the neighbor cell or the pilot signal in a data burst as the interference signal information.

In addition, the radio access station (RAS) transmits the interference signal information along with a preamble index or its base station ID to the access controller (ACR).

Also, the radio access station RAS does not transmit the interference signal information to the access controller ACR when the interference signal information has a predetermined value or less.

In addition, the access controller (ACR) resets the scheduling information when the number of users connected by each radio access station (RAS) is added or when the usage mode information for each radio access station (RAS) is changed. .

In addition, when the data rate of the downlink required by the user increases to satisfy the quality of service (QoS) for each user, the radio access station (RAS) receives a request message for releasing the scheduling information. Transmission to the access controller (ACR).

In addition, the access controller (ACR) transmits a release command of the scheduling information to the radio access station (RAS), or resets the scheduling information and sends it to the radio access station (RAS).

In addition, when a change in the strength of an interference signal occurs and the change of the interference group requires a change, the access controller (ACR) generates a new interference group, generates new scheduling information, and transmits it to the radio access station (RAS). Done.

On the other hand, the mobile communication service scheduling method according to the present invention for achieving the above object is a radio access station (RAS) for converting the transmission data into an RF signal and outputs, and receiving the transmission data from the core network and the wireless connection A method for scheduling a mobile communication service of a system including an access controller (ACR) for transmitting to a station, the method comprising: (a) the radio access station (RAS) measuring an interference signal level from a neighboring cell and obtaining the interference signal information accordingly; Transmitting to the access controller (ACR); (b) the access controller (ACR) generating an interference group between cells having an interference signal level of a predetermined level or more for the interference signal information; (c) the access controller (ACR) setting scheduling information of the radio access station (RAS) belonging to the interference group; (d) the access controller (ACR) transmitting the scheduling information to each of the radio access stations (RAS); And (e) the radio access station (RAS) scheduling the transmission data based on the scheduling information.

The scheduling information may include an offset value and zone information of an OFDMA downlink symbol for each radio access station (RAS), and the offset value is a symbol start number. The zone information is represented by the number of symbols.

In addition, the offset value and the zone information may be set in consideration of the number of users or quality of service (QoS) level for each radio access station (RAS).

In addition, the step (a), the radio access station (RAS) to obtain the signal strength of the preamble (Preamble) or the pilot signal in the data burst received from the neighboring cell as the interference signal information do.

In addition, in step (a), the radio access station (RAS) transmits the interference signal information together with the preamble index or its base station ID to the access controller (ACR).

Also, in the step (a), when the interference signal information has a value of a predetermined level or less, the radio access station RAS does not transmit to the access controller ACR.

In addition, in the step (c), when a user is added to each radio access station (RAS) or a change occurs in usage mode information for each radio access station (RAS), each radio access station in the interference group is selected. (RAS) will re-determine the number of users.

In addition, in step (e), there is an increase in the number of users for which the radio access station (RAS) exceeds the scheduling information, or the downlink (Downlink) data usage rate required by the user increases, thereby increasing the quality of service for each user. If the QoS is not satisfied, a request message for releasing the scheduling information is transmitted to the access controller (ACR).

In step (e), the access controller ACR transmits a release command of the scheduling information to the radio access station RAS or resets the scheduling information according to the request message. RAS).

Meanwhile, an access controller (ACR) according to the present invention for achieving the above object includes a communication unit for communicating with a core network or a plurality of radio access stations (RAS); A controller configured to set scheduling information for each radio access station (RAS) based on the interference signal information received from the plurality of radio access stations (RAS) and transmit the scheduling information to each radio access station (RAS); An interference group generator for generating an interference group between cells having an interference signal level of a predetermined level or more based on the interference signal information; And a scheduling information setting unit for setting scheduling information for each of the radio access stations (RAS).

The apparatus may further include a usage mode information DB that stores usage mode information on an idle state or a traffic state of a user terminal for each radio access station (RAS).

Here, the scheduling information includes offset information and zone information of the OFDMA downlink symbol for each radio access station (RAS).

The controller may be further configured to control the wireless access station through the scheduling information setting unit when the number of users connected to each of the radio access stations is changed or the usage mode information for each radio access station is changed. Resetting the scheduling information for each).

In addition, when receiving the request message for releasing the scheduling information from the radio access station (RAS), the controller transmits a release command of the scheduling information to the radio access station (RAS), or transmits the scheduling information. Reset to transmit to the radio access station (RAS).

When the level of the interference signal is changed and the interference group needs to be changed, the controller generates a new interference group through the interference group generator and generates new scheduling information through the scheduling information generator. To the wireless access station (RAS) via the communication unit.

On the other hand, the mobile communication service scheduling method of the access controller (ACR) according to the present invention for achieving the above object, the access controller for transmitting the transmission data received from the core network to a plurality of radio access stations (RAS) connected to it; A mobile communication service scheduling method of (ACR), comprising: (a) receiving interference signal information for a neighbor cell from the radio access station (RAS); (b) generating an interference group between cells having an interference signal level of a predetermined level or more with respect to the interference signal information; (c) setting scheduling information for each radio access station (RAS) in the interference group; And (e) transmitting scheduling information for each radio access station (RAS) to each radio access station (RAS).

On the other hand, the radio access station (RAS) according to the present invention for achieving the above object, the communication unit for communicating with the access controller (ACR) for transmitting transmission data or in the cell communication unit; A control unit for converting the transmission data into an RF signal and transmitting the RF signal, measuring a level of an interference signal from a neighboring cell, and transmitting the transmission data as interference signal information, or scheduling the transmission data based on scheduling information; An interference signal information generation unit for generating interference signal information by measuring levels of the interference signals received through the communication unit; A scheduling information storage unit for storing the scheduling information received from the access controller (ACR); And a scheduling execution unit that executes scheduling of the transmission data according to the scheduling information.

On the other hand, the mobile communication service scheduling method of the radio access station (RAS) according to the present invention for achieving the above object, the movement of the radio access station (RAS) receiving the transmission data from the access controller (ACR) connected to the core network A communication service scheduling method comprising: (a) measuring a level of an interference signal from a neighboring cell and transmitting the interference signal information to the access controller (ACR) according to the result; (b) receiving scheduling information from the access controller (ACR) after transmitting the interference signal information; And (c) scheduling the transmission data based on the received scheduling information.

Here, the scheduling information includes an offset value and zone information of an OFDMA downlink symbol for each radio access station (RAS), and the offset value is represented by a symbol start number, and the zone (Zone) information is represented by the number of symbols.

On the other hand, the recording medium according to the present invention for achieving the above object, the mobile communication service scheduling method of the access controller (ACR) for transmitting the transmission data received from the core network to a plurality of radio access stations (RAS) connected thereto. A recording medium on which a program for processing a signal is recorded, the method comprising: (a) receiving interference signal information for a neighboring cell from the radio access station (RAS); (b) generating an interference group between cells having an interference signal level of a predetermined level or more with respect to the interference signal information; (c) setting scheduling information for each radio access station (RAS) in the interference group; And (d) a program for processing the step of transmitting scheduling information for each radio access station (RAS) to each radio access station (RAS).

In addition, the recording medium according to the present invention for achieving the above object is recorded by a program for processing a mobile communication service scheduling method of a radio access station (RAS) for receiving transmission data from an access controller (ACR) connected to the core network. A recording medium comprising: (a) measuring a level of an interference signal from a neighboring cell and transmitting the interference signal information to the access controller (ACR) according to the result; (b) receiving scheduling information from the access controller (ACR) after transmitting the interference signal information; And (c) a program for processing the step of scheduling the transmission data based on the received scheduling information.

Here, the scheduling information includes offset value and zone information of OFDMA downlink symbol for each radio access station (RAS).

The offset value is represented by a symbol starting number, and the zone information is represented by the number of symbols.

According to the present invention, the access controller (ACR) transmits scheduling information to each radio access station (RAS) by utilizing information on a user receiving a mobile communication service in a cell in a large building, and each radio access station (RAS) By performing scheduling based on the scheduling information, interference between cells in a large building can be minimized.

In addition, since the frequency between adjacent cells does not have to be used differently in order to reduce interference between cells in a large building, frequency use efficiency is increased and many users can be accommodated in a cell.

In addition, even when the number of users in each cell is increased, the offset value of the scheduling information can be adjusted even when all the resources are used, thereby preventing performance degradation of the mobile communication service in a large building.

Details of the object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood by the following detailed description based on the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the embodiment of the present invention, it is assumed that the mobile communication service in a large building is applied to a portable Internet system that can use a high-speed wireless Internet service at a low rate while moving.

The portable internet system uses various types of portable terminals such as laptops, PDAs, and handheld PCs to access various types of information and contents by accessing the Internet in indoor and outdoor stationary environments and mobile environments at walking speeds and low to medium speeds. It is a service. In addition, it provides mobility of 60 Km / h per hour, and the downlink transmission rate is 24.8 Mbps, but the uplink transmission rate is 5.2 Mbps, which is an IP (Internet Protocol) based wireless data system having up and down asymmetric transmission characteristics.

In addition, the portable Internet system uses a 2.3 GHz frequency band, uses a time division duplex (TDD) as a duplex method to effectively use the allocated frequency spectrum, and a multiple access method. Orthogonal Frequency Division Multiple Access (OFDMA) is used.

Meanwhile, in order to provide multimedia services required by service subscribers with a desired quality of service on the portable Internet, a quality of service (QoS) according to each user's needs must be provided. IP-based internet network does not guarantee high quality because it provides Best Effort Service. As a result, an integrated service proposed by the Internet Engineering Task Force (IETE) has been developed as a way to guarantee QoS.

A typical method for guaranteeing QoS is a resource reservation parameter (RSVP) that allocates network resources according to QoS requirements using the Resource Reservation Protocol (RSVP), and manages network traffic by managing bandwidth according to QoS requirements. Quality is ensured by using priority parameters to control them. However, such a conventional method requires a subscriber station, a client of a multimedia service, to directly participate in a complex signal processing task for guaranteeing QoS, thereby increasing the load on the subscriber terminal and embedding software necessary for the signal processing task. As a result, the requirements of subscriber stations such as memory, central processing units, and peripheral devices are increased.

In order to solve this problem, the present invention supports handover between layers through ACR, measures the interference signal level of neighboring cells in the RAS installed in each layer, and transmits the interference signal to the ACR. In order not to overlap with this interference group, offset values and zone information for each RAS are set and transmitted to each RAS.

Therefore, each RAS performs scheduling of transmission data based on the offset value and the zone information.

1 is a configuration diagram schematically showing the configuration of a mobile communication service scheduling system according to an embodiment of the present invention.

Referring to FIG. 1, the mobile communication service scheduling system 100 according to the present invention includes a core network 110, an ACR 120, and RASs 130 to 134.

The core network 110 is a backbone network for data transmission and reception of a mobile communication service, and receives packet data from an external packet data service such as the Internet (not shown) and transmits the packet data to the ACR 120.

The ACR 120 is a base station controller of a portable Internet network, and is a connection controller for accommodating a plurality of RAS (130 to 134) and connecting between the RAS (130 to 134) or the RAS (130 to 134) and the core network (110). . The ACR 120 performs a handover control function between RAS 130 to 134, a handover function between ACR, a handover function between another base station and RAS 130 to 134, a packet routing function, and an Internet access function. Accordingly, the ACR 120 provides interlayer handover through communication with the RASs 130 to 134 of each layer.

In addition, the ACR 120 uses whether the mobile communication terminals located in the cells of each of the RAS 130 to 134 are idle or in traffic with respect to the plurality of RASs 130 to 134 connected thereto. The mode information is stored in the database. That is, the ACR 120 stores terminal state information for each RAS 130 to 134 as a database.

In addition, the ACR 120 receives the interference signal information from the plurality of RAS (130 ~ 134), and generates an interference group between cells having an interference signal level of a predetermined level or more with respect to the received interference signal information. Subsequently, since the ACR 120 stores usage mode information for each RAS in the DB, the ACR 120 determines the number of users for each RAS in the interference group based on the information. The ACR 120 sets offset values and zone information for each RAS 130 to 134 as much as the number of users in the interference group so as not to overlap the interference group, and sets the set offset value and zone. (Zone) information is transmitted to each RAS (130 ~ 134) as scheduling information.

RAS (130 ~ 134) is a base station of the mobile Internet network, can be installed in one or more on each floor from the first floor to the second floor, ..., n floor in the building, the transmission received from the ACR (120) The data is converted into RF signals and sent to the mobile communication terminals in each floor.

In addition, the RAS (130 ~ 134) transmits the interference signal information measuring the interference signal level of the neighboring cell to the ACR 120, and then receives the offset value and Zone information from the ACR 120 Based on this, scheduling of transmission data is performed.

2 is a diagram for explaining data resource allocation in an OFDMA mobile communication system to which an embodiment of the present invention is applied.

Referring to FIG. 2, in the OFDMA-based mobile communication system such as WiMAX (WiBro), a resource allocation scheme as shown in FIG. 2 is used for the downlink. In FIG. 2, the horizontal direction represents the number of OFDMA symbols and the vertical direction represents the number of subchannels.

In the OFDMA-based mobile communication system, a downlink for transmitting a data burst from the RAS 130 to 134 to a mobile communication terminal and an uplink for transmitting a data burst from the mobile communication terminal to the RAS 130 to 134 Use Up Link.

The type of signal used in the downlink consists of preamble information, MAP information, and data burst information. The preamble information is information for the mobile communication terminal to recognize its own cell, and the MAP information is information on the number of OFDMA symbols and the number of subchannels occupied by the data burst. The preamble information includes, for example, a preamble index or a base station ID.

In the downlink (DL) -map (MAP) that transmits data from the RAS 130 to 134 to the mobile communication terminal, the ACR 120 uses a subchannel offset and an OFDMA symbol offset. In addition, the mobile communication terminal indicates a start point of a data burst to be received and transmits scheduling information specifying the number of subchannels and the number of OFDMA symbols to the RAS 130 to 134.

Each of the RASs 130 to 134 receiving this transmits a data burst including traffic data to a mobile communication terminal located in a cell which is in charge of the mobile terminal based on the scheduling information. Accordingly, the mobile communication terminal recognizes in which position of the downlink frame its data exists, and receives the traffic data by demodulating the data burst assigned to the mobile communication terminal.

Figure 3 is a schematic diagram showing the internal configuration of the ACR according to the present invention.

Referring to FIG. 3, the ACR 120 according to the present invention includes a communication unit 310, a control unit 320, an interference group generator 330, a scheduling information setting unit 340, and a use mode information DB (Data Base) ( 350).

The communication unit 310 communicates with the core network 110 or the RAS (130 ~ 134).

The controller 320 controls scheduling of each RAS 130 to 134 based on the interference signal information received from each RAS 130 to 134 and transmits the scheduling information to each RAS 130 to 134.

The interference group generator 330 generates an interference group between cells having an interference signal level of a predetermined level or more based on the interference signal information received from each of the RASs 130 to 134. That is, the interference group generator 330 generates interference groups between preamble indexes having interference signal levels having a predetermined level or more.

The scheduling information setting unit 340 determines the number of users for each RAS 130 to 134 in the interference group, and sets offset and zone information corresponding to the number of users for each RAS 130 to 134. To generate scheduling information.

The usage mode information DB 350 may display usage mode information regarding the number of users connected to each RAS 130 to 134 or the idle state or traffic state of the user terminal for each RAS 130 to 134. Saving.

Figure 4 is a schematic diagram showing the internal configuration of the RAS according to the present invention.

Referring to FIG. 4, each of the RASs 130 to 134 according to the present invention includes a communication unit 410, a control unit 420, an interference signal information generation unit 430, a scheduling information storage unit 440, and a scheduling execution unit 450. ).

The communication unit 410 communicates with the ACR 120 or with a mobile communication terminal in a cell.

The control unit 420 converts the transmission data into an RF signal and transmits the signal, or measures the level of the interference signal from the neighboring cell to transmit the interference signal information and schedules the transmission data based on the scheduling information.

The interference signal information generation unit 430 receives the interference signal from the neighboring cell through the communication unit 610 and measures the level of the interference signals to generate the interference signal information.

The scheduling information storage unit 440 stores scheduling information received from the ACR 120, that is, offset values and zone information.

The scheduling execution unit 450 executes scheduling of transmission data according to the scheduling information.

6 is a flowchart illustrating a mobile communication service scheduling method according to an embodiment of the present invention.

First, in the mobile communication service system 100 to which the present invention is applied, one or more RASs 130 to 134 are installed in each floor of the building, and a plurality of RASs 130 to 134 for each floor are provided in the ACR 120. In addition to being connected to the dog ACR 120 performs the following operation in the state connected to the core network (110).

Referring to FIG. 6, first, each RAS 130 to 134 is installed at each floor in a building, and then measures an interference signal level coming from neighbor cells at power on (S610). In this case, the interference signal may be a signal strength based on a preamble transmitted by a neighbor base station or may be an intensity of a pilot signal in a data burst.

Accordingly, each RAS 130 to 134 measures the level of the interference signal coming from the cells of the adjacent RAS, and includes the base station unique number, for example, the base station ID or the preamble index, in the measured interference signal level. The ACR 120 transmits the data to the ACR 120 (S620).

At this time, each of the RAS (130 ~ 134) is transmitted to the ACR 120 by dividing the measured interference signal level by the preamble index or base station ID, and the ACR 120 itself for the preamble index having a value below a certain level. May not be sent.

Meanwhile, the ACR 120 which receives the interference signal level for each preamble index or base station ID from each of the RASs 130 to 134 generates an interference group between the preamble indexes having the level of the mutual interference signal having a predetermined level or more (S630). . That is, the ACR 120 generates interference groups between cells having an interference signal level of a predetermined level or more.

Subsequently, the ACR 120 determines the number of users for each RAS 130 to 134 in the interference group (S640). That is, since the ACR 120 stores usage mode information for each RAS 130 to 134 in the database, the ACR 120 determines the number of users for each RAS in the interference group based on this.

The ACR 120 sets offset and zone information as shown in FIG. 5 by the number of users of each RAS in the interference group (S650).

When using, for example, 27 symbols for the downlink, the ACR 120 may set an offset for each RAS for a symbol other than the preamble 1 symbol and the M symbol used for the MAP (27-1-M). 5 is a diagram illustrating an example in which ACR sets offset and zone information for each RAS in an interference group. As shown in FIG. 5, the ACR 120 performs a first offset (1) and a first zone (Zone1) with respect to RAS1 so as not to overlap each RAS included in the interference group with respect to the offset and the zone. The second offset Offset2 and the second zone Zone2 are set for the RAS2, and the third offset Offset3 and the third zone Zone3 are set for the RAS3. At this time, the ACR 120 may set the offset and zone information in consideration of the number of users connected to each RAS and the required QoS level. In the case of WiMAX, an offset may be represented by a symbol start number as illustrated in FIG. 2, and a zone may be represented by the number of symbols as illustrated in FIG. 2.

ACR 120 transmits the set offset and zone information to each RAS (130 ~ 134) included in the interference group of the RAS connected to it (S660).

When the number of users for each RAS in the interference group increases or the usage mode information for each RAS is changed (S662), the ACR 120 performs the step S640 of setting the number of users for each RAS in the interference group.

Each of the RASs 130 to 134 receives the offset and the zone information from the ACR 120, and performs scheduling for the data burst for each zone based on the offset (S670).

Each RAS 130 to 134 may transmit a request for releasing the offset to the ACR 120 when an abnormal state, for example, when the data rate of the downlink required by the user increases and fails to satisfy the QoS for each user, S672) If there is a change in the interference signal level received from the neighboring cell (S674), the step S610 of measuring the interference signal level of the neighboring cell is performed to transmit the interference signal level to the ACR 120 again.

The RAS 130 ˜ 134 may request the release of the offset to the ACR 120 even when there is an increase in the number of users exceeding the offset and zone information received from the ACR 120.

When the ACR 120 is requested to release the offset from each of the RAS 130 to 134, the ACR 120 resets the offset and the zone information to be transmitted to the RAS 130 to 134, or sends the offset release command to the RAS 130 to 134. Can transmit

As described above, according to the present invention, a small base station (RAS) is installed in each floor in a large building composed of a plurality of floors, and each of the small base stations in each floor is connected to the core network through the base station manager (ACR). The small base station measures the interference signal level of the neighboring cell and transmits it to the base station manager, and the small base station sets the offset and zone for each small base station and transmits it to each small base station. A mobile communication service scheduling system and method for performing zone-based scheduling can be realized.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention can be applied to a wireless communication system installed in a multi-storey building.

In addition, the present invention can be applied to a wireless communication system in which a small base station of a femtocell is installed on a plurality of floors in a building.

In addition, the present invention can be applied to a wireless communication system using a communication method such as WCDMA, CDMA, WiBro, etc. in a plurality of floors in a building.

1 is a configuration diagram schematically showing the configuration of a mobile communication service scheduling system according to an embodiment of the present invention;

2 is a view for explaining data resource allocation in an OFDMA mobile communication system to which an embodiment of the present invention is applied;

3 is a schematic view showing an internal configuration of an ACR according to the present invention;

4 is a schematic view showing an internal configuration of a RAS according to the present invention;

5 illustrates an example in which ACR sets offset and zone information for each RAS in an interference group; and

6 is a flowchart illustrating a mobile communication service scheduling method according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: mobile communication service scheduling system 110: core network

120: ACR 130 ~ 134: RAS

310: communication unit 320: control unit

330: interference group generation unit 340: scheduling information setting unit

350: mode information DB 410: communication unit

420: control unit 430: interference signal information generation unit

440: scheduling information storage unit 450: scheduling execution unit

Claims (36)

A radio access station (RAS) which converts and transmits transmission data into an RF signal and measures the level of an interference signal from neighboring cells and transmits the interference data as interference signal information; And Receiving the transmission data from the core network and transmitting the received data to the radio access station, generating interference groups between cells having an interference signal level of a predetermined level or more for the interference signal information transmitted from the radio access station (RAS), and An access controller (ACR) for setting scheduling information for each radio access station (RAS) belonging to an interference group and transmitting the same to the radio access station (RAS), The radio access station (RAS) schedules the transmission data based on the scheduling information. The method of claim 1, The scheduling information includes an offset value and zone information of the OFDMA downlink symbol for each radio access station (RAS). The method of claim 2, The offset value is represented by a symbol starting number, and the zone information is represented by the number of symbols. The method of claim 2, The offset value and the zone information are set in consideration of the number of users for each radio access station (RAS) or quality of service (QoS) level. The method of claim 1, The radio access station (RAS) obtains a signal strength based on a preamble based on the received signal from the neighboring cell or a pilot signal in a data burst as the interference signal information. Communication service scheduling system. The method of claim 1, The method of claim 1, The radio access station (RAS) transmits the interference signal information together with a preamble index (Preamble Index) or its base station ID to the access controller (ACR). The method of claim 1, The radio access station (RAS) does not transmit the interference signal information to the access controller (ACR) when the interference signal information has a predetermined value or less. The method of claim 1, The access controller (ACR) is configured to reset the scheduling information when the number of users connected by each radio access station (RAS) is added or when the usage mode information for each radio access station (RAS) is changed. Mobile service scheduling system. The method of claim 1, The radio access station (RAS) releases the scheduling information when the downlink (Downlink) data rate required by the user does not satisfy the quality of service (QoS) for each user. Mobile service scheduling system characterized in that for transmitting to the access controller (ACR). The method of claim 9, The access controller (ACR) transmits a release command of the scheduling information to the radio access station (RAS), or resets the scheduling information and transmits to the radio access station (RAS). . The method of claim 1, The access controller (ACR) generates a new interference group, generates new scheduling information, and transmits it to the radio access station (RAS) when a change in the strength of the interference signal is required and the interference group needs to be changed. A mobile communication service scheduling system. A mobile communication service scheduling method of a system comprising a radio access station (RAS) for converting and transmitting transmission data into an RF signal, and an access controller (ACR) for receiving the transmission data from a core network and delivering the transmission data to the radio access station. To (a) the radio access station (RAS) measuring a level of an interference signal coming from a neighboring cell and transmitting the interference signal information accordingly to the access controller (ACR); (b) the access controller (ACR) generating an interference group between cells having an interference signal level of a predetermined level or more for the interference signal information; (c) the access controller (ACR) setting scheduling information of the radio access station (RAS) belonging to the interference group; (d) the access controller (ACR) transmitting the scheduling information to each of the radio access stations (RAS); And (e) scheduling the transmission data based on the scheduling information by the radio access station (RAS); Mobile communication service scheduling method comprising a. The method of claim 12, The scheduling information includes an offset value and zone information of an OFDMA downlink symbol for each radio access station (RAS). The method of claim 13, The offset value is represented by a symbol starting number, and the zone information is represented by the number of symbols. The method of claim 13, The offset value and the zone information are set in consideration of the number of users for each radio access station (RAS) or quality of service (QoS) level. The method of claim 12, In the step (a), the radio access station (RAS) uses the preamble-based signal strength received from the neighbor cell or the strength of the pilot signal in a data burst as the interference signal information. Mobile communication service scheduling method, characterized in that obtaining. The method of claim 12, In step (a), the radio access station (RAS) transmits the interference signal information along with a preamble index or its base station ID to the access controller (ACR). Way. The method of claim 12, In the step (a), the interference signal information is not transmitted to the access controller (ACR) when the interference signal information has a predetermined level or less in the radio access station (RAS). Service scheduling method. The method of claim 12, In step (c), when a user is added to each radio access station (RAS) or a change occurs in usage mode information for each radio access station (RAS), each radio access station (RAS) in the interference group is changed. Re-determining the number of users per user and setting the scheduling information accordingly. The method of claim 12, In the step (e), there is an increase in the number of users whose RAS exceeds the scheduling information, or a downlink data rate required by the user increases, so that the user-specific service is increased. If the quality (QoS) is not satisfied, the mobile communication service scheduling method, characterized in that for transmitting the request message for releasing the scheduling information to the access controller (ACR). The method of claim 18, In step (e), the access controller (ACR) transmits a release command of the scheduling information to the radio access station (RAS) according to the request message, or resets the scheduling information to reset the radio access station (RAS). Mobile communication service scheduling method characterized in that the transmission. A communication unit for communicating with a core network or a plurality of radio access stations (RAS); A controller configured to set scheduling information for each radio access station (RAS) based on the interference signal information received from the plurality of radio access stations (RAS) and transmit the scheduling information to each radio access station (RAS); An interference group generator for generating an interference group between cells having an interference signal level of a predetermined level or more based on the interference signal information; And A scheduling information setting unit for setting scheduling information for each of the radio access stations (RAS); Connection controller comprising a. The method of claim 22, The scheduling information includes an offset value and zone information of the OFDMA downlink symbol for each radio access station (RAS). The method of claim 22, A usage mode information DB for storing usage mode information on an idle state or a traffic state of a user terminal for each radio access station (RAS); Connection controller further comprises. The method of claim 22, The controller may be further configured for each of the radio access stations through the scheduling information setting unit when the number of users connected by the radio access stations (RAS) is added or the usage mode information for each radio access station (RAS) is changed. And resetting the scheduling information. The method of claim 22, When the controller receives a request message for releasing the scheduling information from the radio access station RAS, the controller transmits a release command of the scheduling information to the radio access station RAS or resets the scheduling information. And transmitting to the radio access station (RAS). The method of claim 22, The controller may generate a new interference group through the interference group generator and generate new scheduling information through a scheduling information generator when a change occurs in the level of the interference signal and thus requires a change in the interference group. Access controller characterized in that for transmitting to the radio access station (RAS) via a communication unit. A mobile communication service scheduling method of an access controller (ACR) for transmitting transmission data received from a core network to a plurality of radio access stations (RAS) connected thereto. (a) receiving interference signal information for a neighbor cell from the radio access station (RAS); (b) generating an interference group between cells having an interference signal level of a predetermined level or more with respect to the interference signal information; (c) setting scheduling information for each radio access station (RAS) in the interference group; And (d) transmitting scheduling information for each radio access station (RAS) to each radio access station (RAS); Mobile communication service scheduling method of an access controller (ACR) comprising a. A communication unit for communicating with an access controller (ACR) for transmitting transmission data or with a mobile communication terminal in a cell; A control unit for converting the transmission data into an RF signal and transmitting the RF signal, measuring a level of an interference signal from a neighboring cell, and transmitting the transmission data as interference signal information, or scheduling the transmission data based on scheduling information; An interference signal information generation unit for generating interference signal information by measuring levels of the interference signals received through the communication unit; A scheduling information storage unit for storing the scheduling information received from the access controller (ACR); And A scheduling execution unit that executes scheduling of the transmission data according to the scheduling information; Wireless access station comprising a. A mobile communication service scheduling method of a radio access station (RAS) receiving transmission data from an access controller (ACR) connected to a core network, (a) measuring the level of the interference signal from the neighboring cell and transmitting the interference signal information to the access controller (ACR) according to the result; (b) receiving scheduling information from the access controller (ACR) after transmitting the interference signal information; And (c) scheduling the transmission data based on the received scheduling information; Mobile communication service scheduling method of a radio access station (RAS) comprising a. The method of claim 30, The scheduling information may include an offset value and zone information of an OFDMA downlink symbol for each radio access station (RAS). The method of claim 31, wherein The offset value is represented by a symbol start number, and the zone information is represented by the number of symbols. A recording medium on which a program for processing a mobile communication service scheduling method of an access controller (ACR) for transmitting transmission data received from a core network to a plurality of radio access stations (RAS) connected thereto is recorded. (a) receiving interference signal information for a neighboring cell from the radio access station (RAS); (b) generating an interference group between cells having an interference signal level of a predetermined level or more with respect to the interference signal information; (c) setting scheduling information for each radio access station (RAS) in the interference group; And (d) transmitting scheduling information for each radio access station (RAS) to each radio access station (RAS); The recording medium on which the program for processing the recorded data. A recording medium on which a program for processing a mobile communication service scheduling method of a radio access station (RAS) receiving transmission data from an access controller (ACR) connected to a core network is recorded. (a) measuring the level of the interference signal from the neighboring cell and transmitting the interference signal information to the access controller (ACR) according to the result; (b) receiving scheduling information from the access controller (ACR) after transmitting the interference signal information; And (c) scheduling the transmission data based on the received scheduling information; The recording medium on which the program for processing the recorded data. The method of claim 34, wherein And the scheduling information includes offset value and zone information of OFDMA downlink symbol for each radio access station (RAS). The method of claim 34, wherein The offset value is represented by a symbol starting number, and the zone information is represented by the number of symbols.

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