KR101334565B1 - System and method for data balancing - Google Patents

Abstract

The present invention proposes a data balancing system and method for adjusting uploaded data between cells.

To this end, the present invention provides a relay base station in a mobile communication system, comprising: a comparison unit comparing a total amount and a threshold of data uploaded from a plurality of terminals in a relaying cell; A searching unit searching for a first terminal which uploads the most data among the plurality of terminals when the total amount is greater than or equal to the threshold; And a controller for transmitting a message including location information of the first terminal and information requesting an allowable resource to a second terminal located in at least one neighboring cell, to a base station of the at least one neighboring cell.

TDD system, data balancing, mobile communication terminal, cell, base station

Description

DATA BALANCE SYSTEM AND METHOD {SYSTEM AND METHOD FOR DATA BALANCING}

1 is a cell structure applied to a TDD system according to an embodiment of the present invention.

2 is a flowchart illustrating a data balancing method in a TDD system according to an embodiment of the present invention.

3 is a block diagram of a base station according to an embodiment of the present invention.

4 is a flowchart illustrating an MSx search method of a base station located in a relaying cell according to an embodiment of the present invention.

5 is a flowchart illustrating an MSm search method of a base station located in a host cell according to an embodiment of the present invention.

6 is a block diagram illustrating a mobile communication terminal for data balancing in a TDD system according to an embodiment of the present invention.

7 is a flowchart illustrating a data balancing method of a mobile communication terminal in a TDD system according to an embodiment of the present invention.

8 (a), (b), (c) is an exemplary view showing the resource size according to the upload and download of the frame applied in the cell in the TDD system according to an embodiment of the present invention.

9 (a) and (b) are diagrams illustrating that data is differently balanced according to an active or inactive state of an MSm according to an embodiment of the present invention.

The present invention relates to a technique for balancing data, and more particularly, to a data balancing system and method for adjusting data uploaded between cells in a TDD system.

Generally, the 3G system (belowd the 3G system, hereinafter referred to as '4G') is equipped with Ubiquitous & Seamless connection, High data rate, Openness, and network convergence in both wireless network and core network. It is a system that is designed to enable large data transfers, with a particular focus on high data rates.

In order to transmit such a large amount of data, the 4G system is supported by a multiple access technology. Multiple access allows multiple users or systems to share and divide limited radio resources such as time, frequency and code. In the multiple access technology, the duplexing method, the MAC layer, and the physical layer should be considered. The duplexing method is a frequency division duplex (FDD) used symmetrically to provide the same voice call service in the up / down link, and is mainly used in 4G and is asymmetrical through the up / down link. There is a TDD (Time Division Duplex) method mainly used for data transmission.

The TDD method has an advantage of the asymmetry of the up / down link, but since the size of data transmitted / received through the up / down link between cells is different, an overlap of up / down links occurs in the time axis, resulting in interference between cells. ) Causes problems. In addition, they did not use resources efficiently.

Accordingly, in view of the foregoing, the present invention proposes a data balancing system and method for efficiently using resources by adjusting data uploaded between cells.

The present invention proposes a relay base station and a terminal searching method of a relay cell for identifying a terminal having a lot of data uploaded in the relay cell.

In addition, the present invention proposes a host base station and a terminal searching method of a host cell for identifying a terminal having few data uploaded in the host cell.

In addition, the present invention proposes a mobile communication terminal and a method for uploading data from a relaying cell to a host cell.

Hereinafter, the principle of operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to a user, a user's intention or custom. Therefore, the definition should be based on the contents throughout this specification.

First, terms to be used in the detailed description to be described below are defined as follows.

Relay Base Station: A relay base station is a base station that performs load balancing. Since the amount of data uploaded from a plurality of terminals is large, this indicates a base station to perform load balancing. In addition, the relay base station may be designated by the amount of data. That is, a base station having more data to upload relative to the allocated uplink resources may be designated as a relay base station.

Host base station: A host base station represents a base station that allows resources in its cell for load balancing of a relay base station. Such a host base station may be in a location adjacent to the relay base station.

Relaying Cell: The relaying cell consists of a radio wave radius of the relay base station. In addition, it indicates a cell that has a large amount of data uploaded to the relay base station to balance a portion of the uploaded data to an adjacent cell (for example, a host cell).

Host cell: The host cell consists of the propagation radius of the host base station. In addition, the host cell is adjacent to the relay cell, and the total amount of data uploaded is smaller than that of the relay cell, and represents a cell that receives data from the relay cell and uploads the data instead.

MSx terminal (Mobile Station maximum): MSx terminal is located in the relay cell. The terminal shows the largest amount of data currently uploaded in the relay cell. Since the TDD system transmits data in frame units according to an embodiment of the present invention, when one frame is transmitted, the MSx terminal may be changed.

MSm terminal (Mobile Station minimum): MSm terminal indicates a terminal that can receive the data by load balancing from the MSx and upload it without affecting the communication environment in the cell to which it belongs. The MSm terminal may be located in the host cell and adjacent to the MSx terminal. In addition, the state of the MSm terminal may be an active state or an inactive state. Alternatively, even if the amount of uploaded data is not the smallest, it may be selected when the data balancing service is not provided through the terminal with the least amount of uploaded data.

Active Mobile Station: Indicates the terminal that is transmitting or receiving data.

Inactive Mobile Station (Inactive Mobile Station): An inactive terminal represents a terminal in which data is not transmitted or received, that is, an idle terminal. A terminal capable of receiving data from an MSx and uploading the received data to a base station located in a host cell.

Threshold Value: The threshold value is a reference value for determining whether to perform load balancing according to the present invention. In other words, if the amount of uploaded data exceeds the threshold, load balancing is performed. In addition, the threshold is set in the base station and the terminal located in each cell, it can be adjusted by the system administrator, service provider.

In the following description of the present invention, a TDD system for data balancing and a data balancing method in the TDD system proposed by the present invention will be described, and also the data balancing of the mobile communication terminal applied to the data balancing and the mobile communication terminal through the same We will describe the method.

In the mobile communication system according to the present invention for achieving the above-described relay (Relay) base station, the comparison unit for comparing the total amount of data uploaded from a plurality of terminals in the relaying cell (Relaying Cell) and the threshold; A searching unit searching for a first terminal which uploads the most data among the plurality of terminals when the total amount is greater than or equal to the threshold; And a controller for transmitting a message including location information of the first terminal and information requesting an allowable resource to a second terminal located in at least one neighboring cell, to a base station of the at least one neighboring cell.

In addition, the method for data balancing in the relay base station of the mobile communication system according to the present invention, a process of comparing the total amount and the threshold of the data uploaded from a plurality of terminals in the relaying cell (Relaying Cell) ; If the total amount is greater than or equal to the threshold, searching for a first terminal that uploads the most data among the plurality of terminals; Transmitting a message including location information of the first terminal and information requesting an allowable resource to a second terminal located in at least one neighbor cell, to a base station of the at least one neighbor cell; And when the response message for the transmitted message is received from the base station of the at least one neighboring cell, transmitting the response message to the first terminal.

In addition, in a mobile communication system according to the present invention, a host base station located in a cell adjacent to a relaying cell may include a first terminal uploading the most data from the relay base station of the relaying cell in the relaying cell. A receiving unit for receiving a message including location information of and information for requesting an allowable resource to a second terminal located in the adjacent cell; And searching for a plurality of terminals adjacent to the location of the first terminal based on the location information of the first terminal included in the received message, identifying active terminals among the searched plurality of terminals, and checking the identification. And a control unit configured to detect the second terminal having the least uploaded data among the active terminals, and to check the allowable resources of the second terminal and transmit the same to the relay base station.

In addition, a method for balancing data in a host base station located in a cell adjacent to a relaying cell of a mobile communication system according to the present invention may be performed by transferring data from the relaying base station of the relaying cell to the relaying cell. Receiving a message including location information of a first uploading terminal and information requesting allowable resources of a second terminal located in the adjacent cell; Searching for a plurality of terminals adjacent to the location of the first terminal based on the location information of the first terminal included in the received message; Identifying active terminals among the searched plurality of terminals, and detecting the second terminal having the least uploaded data among the identified active terminals; And identifying an allowable resource of the second terminal and transmitting it to the relay base station.

In addition, in the mobile communication system according to the present invention, the first terminal that uploads the most data from the relaying cell receives a message including information of a second terminal located in at least one adjacent cell from a relay base station. A control unit which checks available resources for uploading data to the second terminal and adjusts uplink resources in the same way as the identified available resources; And a control unit controlling to transmit the data to the second terminal using the adjusted uplink resource.

In addition, a method for data balancing in a first terminal that uploads the most data in a relaying cell of a mobile communication system according to the present invention comprises: a second cell located in at least one adjacent cell from a relay base station; Identifying a resource available for uploading data to the second terminal when receiving a message including information of the terminal; Adjusting an uplink resource equal to the identified available resource; And transmitting the data to the second terminal by using the adjusted uplink resource.

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1 is a cell structure applied to a TDD system according to an embodiment of the present invention.

As shown, the TDD system according to an embodiment of the present invention is a base station 110 that provides a variety of services to the cells (100, 200, 300) that is the service radius of each base station, and a plurality of mobile communication terminals located in each cell , 210 and 310, and a plurality of mobile communication terminals under the control of the base station and provided with mobility.

The cells 100, 200, and 300 are made up of propagation radii of respective base stations 110, 210, and 310. A mobile communication terminal (hereinafter referred to as a "terminal") located in such a cell should be able to transmit and receive signals transmitted from each base station without distortion. The base station located in each cell not only manages the cell, but also provides necessary information to terminals receiving or wanting to receive various services in the cell.

Although the cell region is shown in a lattice structure in FIG. 1, this is for easily explaining the present invention. In general, the cell region is formed of a circle having a predetermined radius around the base station. According to the technical concept of the present invention in FIG. 1, a relay base station (Relaying Cell) is the total data uploaded (or uplink, ie data transmission from the terminal to the base station) from the terminals in the relay cell The threshold refers to a base station approaching or exceeding a predetermined threshold (the maximum amount a relay base station can process data received from terminals). In addition, the host base station means a base station located in a host cell adjacent to the relaying cell. The host base station refers to a base station located in a cell in which the total amount of data uploaded from terminals located in a host cell is smaller than the relay base station or a terminal adjacent to the terminal having the largest data upload in a relay cell.

The relaying cell has a plurality of terminals 120, 130, 140, etc., and the host cell 1 200 also has a plurality of terminals 220, 230, 240, 250, and so on. In addition, each terminal is provided with communication modules (eg, Ad Hoc module, Bluetooth module, IrDA module) for transmitting predetermined data to neighboring terminals.

Data balancing is a technique of distributing and processing uplink data in a specific cell to at least one other cell. That is, it indicates that terminals located in one cell (eg, relaying cell) upload data (or frames) to be uploaded through a relay base station via terminals located in an adjacent cell. That is, it occurs when the total amount of data to be uploaded by terminals located in the relaying cell exceeds the capacity that the base station can process. As such, when the relay 110 base station has more data uploaded than the host base station 210 located in the host cell, the relay 110 transmits the data to the terminal located in the host cell so that the uploaded data is uploaded through another terminal located in the host cell. Say that.

As such, in order to balance data, the relay base station 110 located in the relaying cell calculates the total amount of data uploaded from the terminals 120, 130, and 140 located in its cell 100 (ie, the relaying cell). Check it. The total amount of data may be checked periodically or when an event (i.e., the total amount of data uploaded from the terminals is more than the base station can handle or when the host cell 200, 300, etc.) occurs.

The total amount of data can be checked because bandwidth is allocated to each terminal. This may be possible through the base station whether the bandwidth of each of the terminals and the current bandwidth. Alternatively, the base station knows information of each terminal (eg, whether the current state is active or inactive), information on whether to transmit or receive data, location information of each terminal, and the like. This can be seen from

2 is a flowchart illustrating a data balancing method in a TDD system according to an embodiment of the present invention.

Hereinafter, a data balancing method for uploading data to a neighbor cell in a TDD system according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

The relay base station 110 located in the relaying cell 100 calculates the total amount of data uploaded. Then, the calculated total amount is compared with the size of the throughput (that is, the threshold) that the relay base station 110 can process data (S100). In addition, if the total amount is greater than the throughput, the relay base station 110 determines the terminal (ie, MSx) that uploads the most data to itself (S102). In step S102, the relay base station groups the terminals clustered in the same cell, and selects a terminal with a lot of data upload therefrom. In addition, the relay base station 110 not only identifies the terminal according to the comparison result, but also if the total amount of data uploaded is significantly larger than that of the host base station 210 of the neighbor cell (for example, the host cell). S102). The reason why the relay base station 110 can compare the amount of data uploaded with the host base station 210 is that in the mobile communication system according to the present invention, base stations corresponding to each cell are uploaded / downloaded from the base station of the neighboring cell. This is because the amount of data is periodically exchanged with a large amount of information of terminals belonging to each cell. For this reason, each base station can determine the total data amount of neighbor cells in real time or periodically.

When the MSx 130 is identified in the process S102, the relay base station 110 transmits a message including various information to the host base station 210 of at least one host cell adjacent to the MSx 130. (S104). The various pieces of information are information indicating the communication mode (eg, 16QMA, 64QAM, etc.) of the MSx 130, and the MSx 130 is located in an adjacent cell (ie, a host cell) instead of its own cell (ie, a relaying cell). Information indicating that the data of the MSx 130 is to be transmitted through the terminal (MSm) adjacent to the information, information indicating the location of the MSx 130, and information requesting the communication mode information of the MSm.

The base station 210 located in the host cell receiving the message identifies the terminals adjacent to the MSx 130 among all the terminals located in the cell 200 (S106). As a method of identifying a terminal adjacent to the MSx 130, there is a method of determining a distance and a location of the base station and the terminal through the electric field strength of a signal periodically transmitted and received by the terminal and the base station. Alternatively, each base station may determine a terminal adjacent to the MSx 130 through the orientation information of the MSx 130. This is because each base station periodically exchanges location information of base stations and terminals of adjacent cells, base station status, orientation information including latitude and longitude of the base station, and so on. The position of 130 can be grasped.

When the terminals adjacent to the MSx 130 are identified, the terminals with the SINR greater than the threshold are searched among the identified neighbor terminals. Then, it is determined whether each terminal is in an active state, an inactive state, or the same communication mode as that of the MSx 130 among the identified terminals (S108). The active state refers to a state in which a terminal is currently transmitting / receiving data, and the inactive state refers to a state in which data is not transmitted / received, that is, an idle state.

In operation S108, a terminal having a small amount of currently uploaded data or a terminal MSm having the same communication mode as that of the MSx 130 may be identified. The MSm may be a terminal having the least data uploaded among the terminals adjacent to the MSx 130, or a communication mode for transmitting and receiving data may be a terminal such as the MSx 130 even though the uploaded data is the least. . Alternatively, the MSx 130 may be an inactive terminal in the same communication mode or may be a terminal having excellent throughput or performance when data balancing is performed. As such, an algorithm for determining an optimal MSm for balancing data is stored in the memory of the base station, and the detailed description thereof will be described with reference to FIG. 5.

When the host base station 210 determines the MSm, the MSx 130 is adjacent and notifies the MSm that data is to be received from the MSx 130 of the relaying cell (S112). In addition, when the host base station 210 receives a message allowing data balancing from the MSm, the determined location information of the MSm, communication mode and modulation scheme information of the MSm, unique information of the MSm such as IP, SINR value and data The message allowing the upload is transmitted to the relay base station 110 of the relaying cell (S114).

When the relay base station 110 receives such a message, the relay base station 110 transmits the position information of the MSm for data upload and information including the communication mode to the MSx 130 (S116). The communication channels of the MSx 130 and the MSm are set up through the processes S110-S116, and data to be uploaded is transmitted through the set up channel (S118).

This process may be applied only to terminals whose maximum amount of data is uploaded, or may be simultaneously applied to terminals whose amount of uploaded data is more than a predetermined threshold. And, since the data is uploaded through the terminal located in the adjacent host cell, the relay base station located in the relay cell can process the data uploaded to it faster. In addition, the data described in the above process may be a frame unit or a packet unit.

3 is a configuration diagram of a base station in a TDD system according to an embodiment of the present invention.

As shown, the base station according to the embodiment of the present invention receives a variety of signals from the base station adjacent to a plurality of terminals, and conversely, the transceiver 111 for transmitting a variety of signals to the base station adjacent to the plurality of terminals and A comparator 114 which checks the amount of data uploaded from all terminals in the cell and compares whether the identified amount of data exceeds a threshold; and when the result of the comparison exceeds the threshold, A search unit 112 that selects terminals uploading more data than the amount of data allocated to each terminal among all terminals in the cell, and searches for a terminal MSx having the largest amount of data uploaded among the selected terminals; The threshold for comparing the magnitudes of the identified amounts of data or multiple applications for operating a base station It controls the overall operation of the memory 113 and the base station storing the value, the location information of the terminal through the location information of the terminal received from the terminal, and the information of the MSx to the other terminal (MSm) of the adjacent cell ) And a control unit 115 for controlling a plurality of devices configured in the base station.

In addition, the controller 115 is located in an adjacent cell and requests information of a terminal (MSm) adjacent to the MSx, to upload data to the MSm, the location information of the MSx, and the communication mode and modulation scheme of the MSx Send a message containing information about the to the base station.

If the signal received through the transceiver 111 is received from a host base station of an adjacent host cell and requests a signal of a terminal adjacent to the MSx 130, the searcher 112 controls the controller 115. Analyze the received signal under the control of. Then, the terminals adjacent to the MSx 130 are identified. In addition, the search unit 112 determines whether the identified terminal is in an active state or an inactive state. In addition, the search unit 112 has a built-in module for identifying the terminal (MSm) of the minimum data uploaded to the current base station among the identified active state.

As described above, the signal received from the host base station 210 corresponding to the neighboring cell is the basis for the search unit 112 to identify terminals adjacent to the MSx 130. This is because location information indicating the current position and latitude and longitude information indicating the amount of data to be uploaded are included. The relay base station receiving the signal including this information can determine the terminals adjacent to the MSx based on the location information of the MSx. When the terminal adjacent to the MSx is identified, the terminal in the active state and the terminal in the inactive state are classified. Also, among the terminals in the active state, the terminal with the largest resource (eg, bandwidth, time, time slot, channel, etc.) that can upload data is identified.

The configuration diagram of the base station illustrated in FIG. 3 is a configuration diagram applicable to base stations located in the relaying cell and the host cell. The operation mode of the base station may be divided into a case of operating in a relay cell and a case of operating in a host cell. 4 is an MSx search method of a relay base station located in a relay cell, and FIG. 5 is an MSm search method of a host base station located in a host cell.

4 is a flowchart illustrating an MSx search method of a relay base station located in a relay cell according to an embodiment of the present invention.

Hereinafter, the MSx search method of a relay base station located in a relay cell according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4 as follows.

The base station located in each cell periodically exchanges various information with the base stations located in the neighboring cells through the transceiver 111. The exchanged information may include unique information of a terminal located in each cell, location information, communication mode information of a terminal capable of handoff, unique information such as IP of a terminal, and data uploaded from each terminal. Calculate the total amount of and include information about what is the total amount calculated. Since such a large amount of information is periodically exchanged between base stations, each base station periodically checks how much data is uploaded through the terminals located in its cell or how much the terminals upload in the neighboring cell upload data. You can figure it out. If the amount of data uploaded is larger than the neighboring cell due to such grasp, the comparison unit 114 configured in the base station compares whether the total amount of data currently uploaded is greater than the threshold (S200).

If the total amount of data is greater than the threshold value, the searcher 112 identifies terminals using resources larger than the upload resources allocated to upload data for each terminal. The terminal MSx searches for the largest number of uploaded data among the identified terminals (S202 and S204). The controller 115 determines the current position of the MSx 130 and which cell the MSx 130 is adjacent to (S206). In the process (S 206), the control unit 115 can be identified through the location information of the terminal which is pre-stored in the memory 113 and updated periodically or received from all terminals in the cell periodically.

When the location of the MSx 130 is determined, the data of the MSx 130 is to be balanced, the location information of the MSx 130, and the address and communication mode information of the terminal MSm adjacent to the MSx 130 are requested. The message is transmitted to one or more host base stations adjacent to the MSx 130 (S208). When the terminal adjacent to the MSx 130, that is, the MSm information is received from the host base station, the MSx 130 transmits a message to upload data through the received MSm (S210 and S212).

5 is a flowchart illustrating an MSm search method of a host base station located in a host cell according to an embodiment of the present invention.

Hereinafter, an MSm search method of a host base station located in a host cell according to an embodiment of the present invention will be described in detail with reference to FIG. 5.

When a message for requesting information of the MSm is received from the relay base station 110 of the relaying cell, the control unit 115 of the host base station 210 analyzes the received message (S300). The received message includes resource values (eg, bandwidth value, frequency, time, time slot, channel, etc.) required by the relaying cell, location information of the MSx 130, and the like. In addition, the searching unit 112 searches for terminals adjacent to the MSx 130 through the analyzed message under the control of the control unit 115 (S302). In operation S304, among the searched terminals, terminals having a Signal to Interference Noise Ratio (SINR) greater than a threshold are searched for. SINR represents the signal-to-noise ratio. The larger SINR means that less information is lost due to noise or distortion when any signal is transmitted, and the throughput is excellent when the signal or data is transmitted. When terminals having a SINR greater than a threshold are searched in step S304, a terminal MSm having the least data upload is selected among the searched terminals at step S306. When the terminal uploading the least data is selected, it is checked whether the selected terminal is in an active state or an inactive state (S308).

If the terminal checked in step S308 is in an active state, an allowable resource for uploading data is detected (S308). The host base station 210 transmits a message including the detected allowable resource amount, unique information of the MSm, location information, and the like to the relay base station 110 (S318).

If the checked terminal is in an inactive state in step S308, the communication mode or modulation scheme (eg, 16QAM, 64QAM, etc.) of the MSx 130 and the checked terminal is the same (S308, S312).

In step S312, if the communication mode or modulation scheme of the MSx 130 and the MSm are the same (that is, the modulation or transmission scheme for transmitting and receiving data is the same), an allowable resource of the MSm is detected. The host base station 210 transmits a message including the detected allowable resource amount, unique information of the MSm, location information, and the like to the relay base station 110 (S314-S318).

If the MSx 130 and the MSm do not have the same communication mode or transmission method (i.e., to transmit / receive data using Ad hoc, Bluetooth, IrDA), the modulation process or communication mode is changed. Or when only transmission / reception is performed through a series of processes such as channel switching), a command for converting the communication mode of the currently active terminal to match the MSx 130 is transmitted to MSm. Then, the available resource is detected (S320). The reason for determining the communication mode of the MSx 130 in the process S320 is that the message received from the relay base station 110 includes information on the communication mode and the modulation scheme of the MSx 130.

The message including the allowable resource amount detected in the step S320, the unique information of the MSm, the location information, etc. is transmitted to the relay base station 110 via the base station 210 of its own cell (ie, the host cell). (S318).

6 is a block diagram of a mobile communication terminal for data balancing in a TDD system according to an embodiment of the present invention.

6 shows only components necessary for describing the exemplary embodiment of the present invention, and general components of the terminal that obscure the gist of the present invention are omitted.

As shown, the terminal according to an embodiment of the present invention is a transceiver 131 for receiving or transmitting a message containing data, signals, or information of another terminal (eg, MSm) from the base station or another terminal to the base station or the terminal And a control unit 135 for analyzing the received message, identifying an MSm resource for transmitting data to the MSm, and controlling a communication channel setup with the MSm for transmitting data to the MSm through the identified resource; The controller 132 adjusts a switching poing to transmit data in units of time slots using the resources identified in the received MSm information, and the communication mode of the MSm in the received message is MSx. ), Or a different modulation scheme, the communication module unit 134 for converting its communication mode to match MSm or matching the modulation scheme, and a base station or another. And a memory 133 for storing data or signals received from the terminal.

The transceiver 131 is provided with various communication modules for transmitting and receiving data, signals, or messages, and the provided modules include a plurality of modules capable of transmitting and receiving data with Ad hoc module, Bluetooth module, IrDA module, and the like. Include.

In addition, when the terminal supports the dual communication mode (Dual Telecommunications Mode), the communication module unit 134 has a module for performing such dual communication is built-in. Through the dual communication mode, a terminal may provide a service to a plurality of users at the same time even if the communication system or method is different from that of the terminal, and may simultaneously transmit data to be transmitted to a plurality of terminals or devices.

In addition, the reason for moving the intersection point in the control unit 132 is to increase the bandwidth for uploading data, and eliminates the overlapping area of upload and download in the total bandwidth allocated to the MSx 130 and uploads the intersection point. This is to make the upload of data faster by moving to increase the bandwidth. Detailed description thereof will be described in detail with reference to FIGS. 8A, 8B, and 8C.

Hereinafter, an operation of a data balancing device of a mobile communication terminal in a TDD system according to an embodiment of the present invention will be described with reference to FIG. 6.

When the message containing the information of the MSm is received through the transceiver 131, the controller 135 analyzes the received message to determine whether the resource is sufficient to transmit data or a frame to the MSm. If the identified resource is sufficient to transmit the frame or there is room for transmission, the communication mode for directly transmitting the frame to the MSm is activated and set, and the channel is set up accordingly. When the channel is set up and a series of processes for transmitting a frame are performed, the controller 132 balances a time slot of a frame to be transmitted by itself (ie, MSx) based on the identified resources of the MSm. .

The reason for balancing the time slot is because a frame is divided into a plurality of time slots, and only data corresponding to one time slot is transmitted at a specific time. For this reason, among the total resources (e.g., bandwidth) allocated to each terminal, the resources available for uploading the frame and the resources available for downloading the frame are appropriately adjusted to adaptively adjust the resources for optimal transmission and reception. Can be achieved.

When balancing of the time slot is performed, the controller 135 transmits and controls the frame to the MSm in units of slots through the set up channel.

7 is a flowchart illustrating a data balancing method of a mobile communication terminal in a TDD system according to an embodiment of the present invention.

Hereinafter, a data balancing method of a mobile communication terminal in a TDD system according to an embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7.

If the message received from the base station is a message including the information of the terminal (MSm) located in the neighbor cell, the received message is analyzed (S400). The analysis means identifying the communication mode, modulation scheme, uploadable resources, location, and address (eg, IP or unique information) of the MSm. Then, a channel for directly uploading data to MSm is set up (S404). The channel setup is possible when the MSm and the communication mode or modulation scheme of the MSm (i.e., MSx) are the same and the resources necessary for transmitting data to the MSm are sufficient or available. In order to upload the frame by expanding the uplink bandwidth, a balancing point is balanced (S406). The reason for balancing is to increase the bandwidth for uploading data, and to eliminate the overlapping area of upload and download in the total bandwidth allocated to the MSx 130 and to move the intersection to increase the upload bandwidth. This is to make uploading faster. Detailed description thereof will be described in detail with reference to the following drawings (FIGS. 8A, 8B, and 8C).

When the intersection point for uploading data is balanced in the process (S406), the frame is directly transmitted to the MSm in units of slots by utilizing the balanced resources through the setup channel (S408). In this case, the transmitted frame is transmitted earlier than before the intersection is balanced.

There are two ways to be executed later, which can be adaptively implemented depending on the implementation method.

First, the first method is as follows.

After the process S408 is performed, if one frame is transmitted, the process returns to the process S400. The reason for the feedback to the process (S400) is because a frame is divided into a plurality of time slots in the TDD system, and the frame is transmitted for each divided time slot. That is, when transmission of one frame having balanced intersections is completed, the base station 110 of the relaying cell repeatedly performs the processes illustrated in FIG. 4 and the processes S400 to S410 of FIG. 7. When all data transfer is completed due to this repetitive performance, MSx ends the data transfer to MSm.

Alternatively, as another embodiment of the first method, the second method is as follows.

After the process S408 is performed, if one frame starts to be transmitted, the controller 135 ends data transmission after all frames to be transmitted to the MSm are completed.

The first method is superior in terms of the base station managing and controlling the frame upload path of the MSx in real time, and the second method processes the frame to be uploaded in a faster time, thereby increasing the data transmission rate over time. fast.

8 (a), (b) and (c) are exemplary views illustrating resource sizes according to upload and download of a frame applied in a cell in a TDD system according to an embodiment of the present invention.

As shown, resources (eg, bandwidth) in a host cell (upper end) and a relaying cell (lower end) according to an embodiment of the present invention are divided into resources for uploading data and resources for downloading. 8 (a) shows the bandwidth allocated to the base station 110 of the host cell, and the terminals in the cell transmit data, as opposed to the downlink bandwidth transmitted by the base station and allocated by the terminal. Indicates the uplink bandwidth allocated for the base station to receive.

In FIG. 8 (a) to (B) shows the interference (interference) between the host and the relaying cell, the present invention is to reduce the interference between the cells, to adaptively adjust the uploaded data in Figure 8 (a) (B) Minimize or eliminate sections.

FIG. 8 (b) is an exemplary diagram for illustrating such a concept. In FIG. 8 (a), a base station corresponding to a relaying cell transmits data uploaded to itself to an adjacent cell, thereby ultimately uploading bandwidth of a host cell. By reducing the amount of data uploaded to the base station of the relay cell. In this way, by adaptively adjusting the exchange point of uploading and downloading of the relaying cell, it can be expressed as shown in FIG.

8 (c) is an exemplary diagram illustrating a case where the bandwidth of upload and download between a reeling cell and a host cell is optimally used.

As described above, since the base station located in each cell periodically exchanges the current bandwidth usage with the base station of the neighboring cells, data balancing can be performed, resulting in the same as the neighboring cell in uploading and downloading data.

To this end, when the total amount of data uploaded from terminals located in its cell is larger than neighboring cells, the base station analyzes the amount of data uploaded from each terminal and groups the data by predetermined regions. And, in the grouped area, the terminal with the maximum data upload is identified. In addition, the data to be uploaded by the identified terminal is located in the adjacent cell and transmitted to the terminal located near the identified terminal, thereby reducing the amount of data uploaded in its own cell as a whole.

9 (a) and 9 (b) are exemplary diagrams illustrating that data is differently balanced depending on an active or inactive state of an MSm according to an embodiment of the present invention.

9A shows data balancing when MSm is in an active state.

Since the MSx receives information from the base station of the host cell about the maximum bandwidth that the MSm can allow to transmit data through the MSm, the MSx sends data according to the bandwidth that the MSm can process based on the received information to the MSm. send.

9 (b) shows data balancing when MSm is in an inactive state.

If you want to upload data through MSm in which MSx is inactive, MSx must first check whether its communication mode and modulation method are the same as MSm. The check is possible because the base station corresponding to the MSm, that is, the base station of the host cell determines and selects the MSm, and transmits the communication mode, modulation method, location information, port information, etc. of the MSm to the relay cell base station. . This allows the MSx to know if it and the MSm are the same as the communication mode and the modulation method, as well as their location. As such, when the communication mode and modulation method of the MSm are the same as those of the MSx, data can be uploaded through the inactive MSm.

In the above-described embodiment of the present invention, a description is given of the content balancing of data by a terminal (i.e., MSx) having the maximum data uploaded to one base station (i.e., a relay base station). Can be applied simultaneously.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention . Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

As described above, according to the present invention, by optimizing the upload and download of data, by controlling the exchange point of the uplink and downlink on a cell basis and balancing the data, the TDD system In addition to minimizing the interference problem with neighboring cells by eliminating overlap, it is possible to maximize the throughput of the network by improving the data processing speed in the cell.

Claims (40)

In a relay base station in a mobile communication system, A comparison unit for comparing the total amount of data uploaded from a plurality of terminals in a relaying cell with a threshold; A searching unit searching for a first terminal which uploads the most data among the plurality of terminals when the total amount is greater than or equal to the threshold; And And a control unit for transmitting a message including location information of the first terminal and information requesting an allowable resource to a second terminal located in at least one neighboring cell, to a base station of the at least one neighboring cell. The method of claim 1, wherein the search unit And relaying the position of the first terminal by using electric field strength, latitude, and longitude information of a signal periodically transmitted by the first terminal. The method of claim 1, wherein the search unit And identifying terminals that want to use a resource exceeding an allocated uplink resource for each terminal, and searching for the first terminal that uploads the most data among the identified terminals. The method of claim 1, wherein the message is At least one of information indicating that data of the first terminal is to be uploaded through the second terminal, information requesting an address or unique information of the second terminal, information indicating a communication mode or a modulation scheme of the first terminal; Relay base station characterized in that it further comprises. The method of claim 1, wherein the control unit And when the response message for the transmitted message is received from the base station of the at least one neighboring cell, transmitting the response message to the first terminal. A method for data balancing in a relay base station of a mobile communication system, Comparing a threshold and a total amount of data uploaded from a plurality of terminals in a relaying cell; If the total amount is greater than or equal to the threshold, searching for a first terminal that uploads the most data among the plurality of terminals; Transmitting a message including location information of the first terminal and information requesting an allowable resource to a second terminal located in at least one neighbor cell, to a base station of the at least one neighbor cell; And And when the response message for the transmitted message is received from the base station of the at least one neighboring cell, transmitting the response message to the first terminal. The method of claim 6, wherein the searching is performed. A method of balancing data for a relay base station, comprising: identifying terminals to use resources exceeding resources allocated to each terminal, and searching for the first terminal that uploads the most data among the identified terminals. The method of claim 6, wherein the message sent to the base station of the at least one neighboring cell At least one of information indicating that data of the first terminal is to be uploaded through the second terminal, information requesting an address or unique information of the second terminal, information indicating a communication mode or a modulation scheme of the first terminal; The data balancing method of the relay base station further comprising. The method of claim 6, wherein the response message And an information indicating an address of the second terminal, an allowable amount of resources, a communication mode, a modulation scheme, an active state or an inactive state, and information allowing data upload. A host base station located in a cell adjacent to a relaying cell in a mobile communication system, Receive a message from a relay base station of a relay cell including location information of a first terminal that uploads the most data in the relay cell and information requesting an allowable resource to a second terminal located in the adjacent cell. Receiving unit; And Search for a plurality of terminals adjacent to the location of the first terminal based on the location information of the first terminal included in the received message, and identify active terminals among the searched plurality of terminals; And a controller configured to detect the second terminal having the least uploaded data among the terminals in the active state, and control to identify an allowable resource for the second terminal and to transmit the received resource to the relay base station. 11. The apparatus according to claim 10, When the terminals in the inactive state are identified among the searched plurality of terminals, the first terminal and the identified inactive states are compared with each other to see whether at least one of a communication mode and a modulation scheme is the same. Identify an allowable resource of the second terminal among the identified inactive terminals, and if it does not match, at least one of a communication mode and a modulation scheme of the second terminal is matched with the first terminal; And identifying a resource that is allowable to the second terminal. 11. The method of claim 10, wherein said message is Information indicating that data of the first terminal is to be uploaded through the second terminal, information requesting an address or unique information of the second terminal, information indicating at least one of a communication mode and a modulation scheme of the first terminal. And at least one of the host base station. A method for balancing data at a host base station located in a cell adjacent to a relaying cell of a mobile communication system, Receiving, from a relay base station of a relaying cell, a message including location information of a first terminal uploading the most data in the relaying cell and information requesting an allowable resource of a second terminal located in the adjacent cell; Searching for a plurality of terminals adjacent to the location of the first terminal based on the location information of the first terminal included in the received message; Identifying active terminals among the searched plurality of terminals, and detecting the second terminal having the least uploaded data among the identified active terminals; And And identifying the allowable resources of the second terminal and transmitting them to the relay base station. The method of claim 13, further comprising: identifying terminals in an inactive state among the plurality of discovered terminals; Comparing at least one of a communication mode and a modulation scheme between the first terminal and the identified inactive states; As a result of the comparison, detecting the second terminal having the least uploaded data among the checked inactive states, and identifying resources allowable to the second terminal; And If the result of the comparison does not match, the host further comprises matching at least one of a communication mode and a modulation scheme of the second terminal with the first terminal to identify an allowable resource of the second terminal. Data balancing method of base station. The method of claim 13, wherein the received message is Information indicating that data of the first terminal is to be uploaded through the second terminal, information requesting an address or unique information of the second terminal, information indicating at least one of a communication mode and a modulation scheme of the first terminal. The data balancing method of the host base station further comprises at least one of. In the first terminal for uploading the most data in the relaying cell (Relaying Cell) in the mobile communication system, Upon receiving a message including information of a second terminal located in at least one neighbor cell from a relay base station, identifying a resource available for uploading data to the second terminal and uplinking the same as the identified available resource. Control unit for adjusting the resource; And And a control unit for controlling to transmit the data to the second terminal using the adjusted uplink resource. The first terminal of claim 16, further comprising a communication module unit including a plurality of communication modules for transmitting the data to the second terminal. 17. The apparatus of claim 16, If the at least one of the communication mode and the modulation scheme of the second terminal and at least one of the communication mode and the modulation scheme of the first terminal are different from each other, the message may be checked to determine at least one of the communication mode and the modulation scheme of the first terminal. And matching the at least one of a communication mode and a modulation scheme of the second terminal, and then transmitting the data to the second terminal using the adjusted uplink resource. The method of claim 16, wherein the control unit A communication channel is set up to transmit the data to the second terminal, and a crossing point is balanced in time slots to transmit the data through the communication channel by the identified available resources. The first terminal. The method of claim 16, wherein the data is A first terminal, which is a frame applied in a TDD system and is transmitted to the second terminal in units of time slots. 17. The method of claim 16, And at least one of location information of the second terminal, unique information, licensed resource amount, information of at least one of a communication mode modulation scheme, and information indicating an active or inactive state. 17. The method of claim 16, wherein the available resource is And at least one of a bandwidth, a channel, a time, a frequency, and a time slot. A method for balancing data in a first terminal that uploads the most data in a relaying cell of a mobile communication system, the method comprising: When receiving a message including information of a second terminal located in at least one neighbor cell from a relay base station, identifying a resource available for uploading data to the second terminal; Adjusting an uplink resource equal to the identified available resource; And And transmitting the data to the second terminal by using the adjusted uplink resource. The method of claim 23, wherein the adjusting is Setting up a communication channel to transmit the data to the second terminal, and balancing crossing points in time slots to transmit the data through the communication channel by the identified available resources. A data balancing method of the first terminal. The method of claim 23, wherein the transmitting If the at least one of the communication mode and the modulation scheme of the second terminal and at least one of the communication mode and the modulation scheme of the first terminal are different from each other, the message may be checked to determine at least one of the communication mode and the modulation scheme of the first terminal. And matching the at least one of a communication mode and a modulation scheme of the second terminal, and then transmitting the data to the second terminal using the adjusted uplink resource. The method of claim 23, wherein the message, And at least one of location information of the second terminal, unique information, licensed resource amount, at least one of a communication mode and a modulation scheme, and information indicating an active or inactive state. Method of data balancing. The method of claim 23, wherein the available resource is And at least one of a bandwidth, a frequency, a time, and a time slot. 24. The method of claim 23, wherein the data transmitted to the terminal is A frame applied to a TDD system (Time Division Duplex System), and the data balancing method of the first terminal, characterized in that transmitted to the second terminal in a time slot (Time Slot) unit. delete delete delete delete delete delete delete delete delete delete delete delete

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