KR20130109476A - Improved femto-cell resource allocation device and method in lte cellular systems based on fractional frequency reuse - Google Patents

Abstract

PURPOSE: An apparatus for improved Femto-cell resource allocation in a long term evolution (LTE) cellular system using partial frequency reuse and a method thereof are provided to solve co-channel interference between a macro cell and a Femto-cell. CONSTITUTION: A peripheral device information acquisition part (110) acquires information of peripheral Femto-cell and macro cell. A Femto-cell resource allocation part (120) determines an optimum frequency sub band which is to be allocated to the Femto-cell on the basis of the information collected from the peripheral device information acquisition part. A Femto-cell resource broadcasting part (130) broadcasts the determined optimum frequency sub band to the Femto-cell. When the apparatus is applied in an LTE-based cellular system environment using partial frequency reuse, the optimum frequency sub band is allocated to the Femto-cell. [Reference numerals] (110) Peripheral device information acquisition part; (120) Femto-cell resource allocation part; (130) Femto-cell resource broadcasting part

Description

Improved FEMTO-CELL RESOURCE ALLOCATION DEVICE AND METHOD IN LTE CELLULAR SYSTEMS BASED ON FRACTIONAL FREQUENCY REUSE}

The present invention relates to an improved femto-cell resource allocation apparatus and method in a Long Term Evolution (LTE) cellular system using partial frequency reuse as part of a communication service for increasing a transmission rate.

As wireless communication and multimedia technologies continue to develop, demands for high data rates are increasing, and various technologies have been applied to mobile communication systems in order to solve such increasing demands. One of the techniques applied is to allocate more frequency resources, which is inadequate due to the limited frequency resources and the increasing demand for frequency resources. Therefore, there is a need for techniques that can improve the transmission rate without additional physical resources.

An emerging issue of these technologies is the miniaturization of cells. In this sense, femtocells are extremely suitable for small-scale environments that can be used indoors by dramatically reducing cell radius. The femtocell is an indoor base station having a small radius of 10-50m at low power, and serves to connect to a mobile communication core network through a broadband network (Internet) already installed indoors.

When using femtocells, users' mobile devices and femtocells improve service by providing high quality indoor communication environment due to the short distance. In addition, femtocells can be deployed at low cost because they are simply installed in a plug and play method indoors without additional infrastructure.

However, some technical challenges exist in femtocell systems. When a femtocell is applied to an Orthogonal Frequency Division Multiple Access (OFDMA) based network such as LTE, co-channel interference between a femtocell and a femtocell occurs when a femtocell uses a spectrum of a macro cell. Occurs.

To solve this problem, the use of partial frequency reuse improves the efficiency of frequency resource usage. Thus, although the overall throughput of the system has been improved, co-channel interference problems between macrocells and femtocells still exist when femtocells are applied in LTE cellular systems.

Disclosed is a femtocell resource allocation apparatus for solving an interference problem between a macrocell and a femtocell, maximizing overall throughput, and optimizing femtocell resource allocation.

In the present invention, a femtocell resource allocation scheme for solving the co-channel interference problem between a macrocell and a femtocell is required in an LTE-based cellular system using partial frequency reuse.

In addition, the present invention proposes an improved femtocell resource allocation device which solves the problem of interference occurring near the boundary of the lower region of the conventional scheme and increases the performance of the cellular system.

An apparatus for allocating a femtocell resource, comprising: a peripheral device information acquisition unit for acquiring information of neighboring femtocells and macrocells, a femtocell resource allocation unit for determining an optimal frequency subband to be allocated to a femtocell based on information collected from the peripheral device information acquisition unit, And a femtocell resource allocation apparatus comprising a femtocell resource broadcasting unit for broadcasting the determined optimal frequency subband to the femtocell.

In one example, the femtocell resource allocation device may allocate an optimal frequency subband to a femtocell when applied in an LTE-based cellular system environment using partial frequency reuse.

According to another aspect, the peripheral device information acquisition unit obtains the configuration state and channel usage information of the surrounding femtocell and the information on the macrocell. Such information corresponds to a channel assignment state, an installed location, an access mode method, a number of femtocell APs, and a received signal strength of a macrocell, and may be obtained through a WLAN or a radio frequency channel.

According to another aspect, the femtocell resource allocator may grasp the partial frequency reuse structure of the current macrocell based on information received from the peripheral information acquirer.

According to another aspect, a new subzone for femtocell resource allocation can be designed based on the identified partial frequency reuse structure of the macrocell.

According to another aspect, the location of the femtocell can be determined in consideration of the subregion designed based on the information received from the peripheral device information acquisition unit.

According to another aspect, an optimal frequency subband may be allocated to a femtocell in consideration of the designed subregion and the location of the identified femtocell.

In the femtocell resource allocation method, information of neighboring femtocells and macrocells is obtained, an optimal frequency subband to be allocated to a femtocell is determined based on information collected from the peripheral device information acquisition unit, and the determined optimal frequency subband is determined. There is provided a femtocell resource allocation method of broadcasting.

An improved femtocell resource allocation device in an LTE-based cellular system using partial frequency reuse, a macrocell user and a femtocell because femtocells share more frequency bands of existing macrocells and give less interference to macrocell users. This can improve the channel capacity of all users.

We propose an improved femtocell resource allocation device that solves the problem of interference in the vicinity of the lower zone boundary of the conventional scheme and increases the performance of the cellular system. Through this, it is possible to improve the overall cell performance by efficiently operating radio resources.

Therefore, according to the present invention, it is possible to improve the overall performance of the LTE-based cellular system in which the macrocell and femtocell are mixed.

1 is a block diagram illustrating a structure of an femtocell resource allocation device according to an embodiment of the present invention.
2 is a diagram illustrating a cellular system structure for femtocell resource allocation according to an embodiment of the present invention.
3 is a diagram illustrating an algorithm for actual femtocell resource allocation according to an embodiment of the present invention.
4 illustrates an example of a femtocell resource allocation process according to an embodiment of the present invention.
FIG. 5 is a graph illustrating performance of an area of a macro cell as a performance graph of a macro cell user for an optimal FCR size in the embodiment of the present invention.
FIG. 6 illustrates throughput in a region of a femtocell as a performance graph of a femtocell user for an optimal FCR size in the embodiment of the present invention.
FIG. 7 is a graph illustrating a received signal-to-interference and noise ratio (SINR) cumulative distribution function (CDF) of a macro cell user according to the present invention and the conventional scheme of resource allocation scheme according to an embodiment of the present invention. to be.
FIG. 8 is a graph illustrating throughput of a macro cell user according to the present invention and the performance of a conventional resource allocation scheme according to an embodiment of the present invention.
FIG. 9 is a graph illustrating a received SINR CDF of a femtocell user according to the present invention and a conventional resource allocation scheme performance.
FIG. 10 is a graph illustrating a frequency bandwidth allocated to a femtocell user according to the present invention and a conventional resource allocation scheme performance according to an embodiment of the present invention.
FIG. 11 is a graph illustrating a channel capacity of a femtocell user according to the present invention and the conventional resource allocation scheme performance.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a structure of a femtocell resource allocation apparatus 100 according to an embodiment of the present invention. The femtocell resource allocation apparatus 100 obtains an optimal frequency subband to be allocated to the femtocell based on information collected from the peripheral device information acquisition unit 110 and the peripheral device information acquisition unit 110 that obtains information of neighboring femtocells and macrocells. The femtocell resource allocator 120 determines and the femtocell resource broadcaster 130 broadcasts the determined optimal frequency subband to the femtocell.

The femtocell resource allocation device 100 allocates an optimal frequency subband to a femtocell when applied in an LTE-based cellular system environment using partial frequency reuse.

Peripheral device information acquisition unit 110 obtains the configuration status and channel usage information of the surrounding femtocell device and information on the macrocell, the channel assignment status, the installed location, the access mode method, the number of femtocell AP (Access Point), macrocell Information such as Received Signal Strength Indication (RSSI) is obtained through a wireless LAN or a wireless frequency channel. The collected information is transferred to the femtocell resource allocation unit 120.

The femtocell resource allocator 120 determines an optimal frequency subband to be allocated to each femtocell based on the information obtained from the peripheral device information acquirer 110. The frequency subband allocation determined for each femtocell improves the channel capacity of macrocell users by reducing the co-channel interference caused by the femtocell using the macrocell frequency resources, and further improves the channel capacity of the femtocell users. The goal is to improve the throughput of cellular systems.

의 수신 SINR은 다음과 같다.First, user using macro cell

The received SINR of is as follows.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a structure of a femtocell resource allocation apparatus 100 according to an embodiment of the present invention. The femtocell resource allocation apparatus 100 obtains an optimal frequency subband to be allocated to the femtocell based on information collected from the peripheral device information acquisition unit 110 and the peripheral device information acquisition unit 110 that obtains information of neighboring femtocells and macrocells. The femtocell resource allocator 120 determines and the femtocell resource broadcaster 130 broadcasts the determined optimal frequency subband to the femtocell.

The femtocell resource allocation device 100 allocates an optimal frequency subband to a femtocell when applied in an LTE-based cellular system environment using partial frequency reuse.

Peripheral device information acquisition unit 110 obtains the configuration status and channel usage information of the surrounding femtocell device and information on the macrocell, the channel assignment status, the installed location, the access mode method, the number of femtocell AP (Access Point), macrocell Information such as Received Signal Strength Indication (RSSI) is obtained through a wireless LAN or a wireless frequency channel. The collected information is transferred to the femtocell resource allocation unit 120.

The femtocell resource allocator 120 determines an optimal frequency subband to be allocated to each femtocell based on the information obtained from the peripheral device information acquirer 110. The frequency subband allocation determined for each femtocell improves the channel capacity of macrocell users by reducing the co-channel interference caused by the femtocell using the macrocell frequency resources, and further improves the channel capacity of the femtocell users. The goal is to improve the throughput of cellular systems.

의 수신 SINR은 다음과 같다.First, user using macro cell

The received SINR of is as follows.

는 대상 매크로셀

이 부반송파

를 통해서 전송하는 송신 전력이고,

는 매크로셀 유저

에게 간섭을 주는 주변 매크로셀

이 부반송파

를 통해서 전송하는 송신 전력이다.

는 부반송파

에서 매크로셀 유저

과 매크로셀

사이의 채널 이득이다. 이와 유사하게

는 부반송파

를 통해서 펨토셀

가 송신하는 전력이고,

는 부반송파

에서 매크로셀 유저

과 매크로셀 유저

에게 간섭을 주는 주변 펨토셀

사이의 채널 이득이다.

는 백색잡음전력 스펙트럼밀도(White Noise Power Spectral Density)이며,

는 부반송파 간격을 말한다.

Is the target macrocell

This subcarrier

Transmit power through

Is a macro cell user

Surrounding macrocells that interfere with

This subcarrier

Transmit power to transmit through.

Is a subcarrier

Macro cell user

And macrocells

Is the channel gain between. Similarly

Is a subcarrier

Through femtocell

Is the power that

Is a subcarrier

Macro cell user

And macro cell users

Surrounding femtocells

Is the channel gain between.

Is the White Noise Power Spectral Density,

Is the subcarrier spacing.

의 수신 SINR은 다음과 같다.In the case of a femtocell user, 19 macrocells and neighboring femtocells are interfered with. Similar to macrocell users, femtocell users

The received SINR of is as follows.

는 주로 경로 손실에 많은 영향을 받는다. 경로 손실 값을

이라 할 때, 채널 이득

는 다음과 같이 표현할 수 있다.Channel gain

Is mainly affected by path loss. Path loss value

In this case, the channel gain

Can be expressed as follows.

또는 펨토셀 유저

에게 할당된 부반송파

에서의 실제적 채널 용량은 다음과 같이 정의된다.Macro cell user based on the received SINR value described in Equations 1 and 2

Or femtocell user

Subcarriers assigned to

The actual channel capacity at is defined as

로 정의되며 BER(Bit Error Rate)에 관한 상수로, 여기서는 BER을 10의 -6제곱으로 설정하였다.here

Constant for Bit Error Rate (BER), where BER is set to -6 squared of 10.

의 전체 스루풋은 다음과 같다.Target Macrocell Using Actual Channel Capacity

The overall throughput of is

는 부반송파

가 매크로셀 유저

에게 할당되었는지를 알려준다.

이면 부반송파

가 매크로셀 유저

에게 할당된 것이고,

이면 할당되지 않은 것이다. 또한 OFDMA 특성으로 인해 각각의 부반송파

는 하나의 유저에게만 할당이 된다. 즉, 이것은

이 매크로셀 하나에서의 총 매크로셀 유저 수라고 할 때,

을 의미한다.here

Is a subcarrier

Macro cell user

Tells if it is assigned to.

Subcarrier

Macro cell user

Is assigned to

Is not assigned. Also, due to OFDMA characteristics, each subcarrier

Is assigned to only one user. In other words, this

Given the total number of macro cell users in one macro cell,

.

의 전체 스루풋은 다음과 같이 정의할 수 있다.Similar to macrocells, femtocells

The overall throughput of can be defined as

역시, 부반송파

가 펨토셀 유저

에게 할당되었는지를 알려주는 요소이고,

는 펨토셀

가 사용하는 서브밴드를 의미한다. 즉, 이것은 매크로셀과 유사하게

가 펨토셀 하나에서의 총 펨토셀 유저 수라고 할 때,

을 의미한다.here

After all, subcarrier

Femtocell User

Element that tells if it has been assigned to

Femtocell

Refers to the subband used. That is, this is similar to macrocell

Is the total number of femtocell users in one femtocell,

.

Using the throughput of the macrocell and femtocell, the total throughput in one macrocell can be expressed as follows.

는 대상 매크로셀 하나에 존재하는 총 펨토셀 개수를 의미한다.here

Denotes the total number of femtocells present in one target macrocell.

Based on the equations described so far, an optimization problem for femtocell frequency subband allocation for the purpose of maximizing throughput of the entire cell can be described as follows.

According to the optimization problem described in Equation 8, there is a need for an optimal femtocell subband allocation scheme capable of maximizing throughput of the entire cell. Accordingly, the present invention proposes a femtocell frequency subband allocation apparatus that can solve the optimization problem of Equation 8 while reducing co-channel interference between femtocell and macrocell.

The macro cell is set up in the same manner as the existing partial frequency reuse based cellular system as shown in the left figure of FIG. After dividing the entire frequency band of the assigned macrocell in half, the other half is divided into three and named as subbands A to D. The center region of the macrocell uses a frequency reuse rate of 1, the edge region is set to a frequency reuse ratio of 3, and subbands A are assigned to the center region, and subbands B, C, and D are lower regions, which are edge regions. It is set up to be assigned to zones E1, E2, and E3 respectively.

In such a macrocell environment, the femtocell is configured to allocate a subband as shown in the right figure of FIG. 2. When the subbands are allocated to the femtocells as described above, the interference problem in the vicinity of the lower region boundary existing in the existing resource allocation scheme can be solved and the overall cell performance can be improved.

라고 하였을 때, 이를 위한 최적화 문제를 기술하면 다음과 같다.However, even in the proposed femtocell resource allocation scheme, the size of the MCR, which is the middle region of the macrocell subregions indicated in the left figure of FIG. If the same is true, an interference problem exists near the boundary between the center region and the edge region. Therefore, an optimal FCR size must be obtained to solve this problem. The radius of the FCR

In this case, the optimization problem for this is described as follows.

는 매크로셀 기지국으로부터 펨토셀

까지의 거리를 나타낸다. 따라서 수학식 9에 기술된 바와 같이 셀 전체의 스루풋을 높여주는 최적의

를 구해야 하며, 본 발명에서는 시스템 레벨 시뮬레이션을 통해서 구하도록 하였다.Where Inter Site Distance (ISD)

Is a femtocell from a macrocell base station

. Therefore, as shown in Equation 9,

It should be obtained, in the present invention was obtained through the system level simulation.

The actual algorithm for the femtocell resource allocation scheme proposed in the present invention is shown in FIG. 3.

에 따라

가 결정되면,

와

의 대소 비교를 통해서 펨토셀이 <도면 2>의 우측 그림에서 셀의 가운데 영역에 있는지 가장자리 영역에 있는지를 판단할 수 있다(여기서

는 sub-band

의 RSSI이다). If the proposed femtocell resource allocation scheme is applied to the practical system, the femtocell detects the surrounding macrocell signals when the power is turned on, and obtains the RSSI of each subband based on the detected results. Once described above

Depending on the

Is determined,

Wow

By comparing the magnitudes of the femtocells, it is possible to determine whether the femtocell is in the middle region or the edge region of the cell in the figure on the right.

Sub-band

RSSI).

가

보다 크다면 펨토셀은 가운데 영역에 있는 것이고, 작다면 가장자리 영역에 있을 것이다. 제안된 펨토셀 자원 할당 방식에 따라 펨토셀이 가장자리 영역에 있다면 펨토셀에게 서브밴드 A가 할당되고, 가운데 영역에 있을 때, 펨토셀은

를 제외한 나머지 RSSI 값들 중에서 가장 작은 RSSI에 해당하는 서브밴드를 할당받게 된다. 예를 들어 펨토셀이 도 2에서 하위 구역 FC1에 위치하고 있다면, 이 펨토셀이 센싱한 RSSI 값들 중에서

값이 가장 작을 것이다. if

end

If greater, the femtocell is in the middle region, and if smaller, it is in the edge region. According to the proposed femtocell resource allocation scheme, if the femtocell is in the edge region, subband A is allocated to the femtocell.

Subbands corresponding to the smallest RSSI among the remaining RSSI values are allocated. For example, if the femtocell is located in the lower zone FC1 in Fig. 2, among the RSSI values sensed by this femtocell

The value will be the smallest.

In fact, when the process of allocating femtocell resource allocation is generally described, reference may be made to FIG. 4.

The peripheral device information acquisition unit 110 obtains the setting state of the surrounding femtocell, channel usage information, and information on the macrocell (410), and transmits the obtained information to the femtocell resource allocator (120).

The femtocell resource allocator 120 determines 420 a partial frequency reuse structure of the current macrocell based on the information received from the peripheral device information acquirer 110. Based on the identified partial frequency reuse structure of the macrocell, a new subregion for femtocell resource allocation is designed (430). The femtocell resource allocator 120 determines the location of the femtocell in consideration of the designed subregion based on the information received from the peripheral device information acquisition unit 110 (440). In addition, the femtocell resource allocator 120 plays a role in assigning an optimal frequency subband to the femtocell in consideration of the designed subregion and the identified femtocell location.

The femtocell resource broadcasting unit 130 broadcasts the information of the femtocell optimal frequency subband determined by the femtocell resource allocation unit 120 to each femtocell device using a WLAN and a radio frequency.

A method for allocating a femtocell resource, the method comprising: acquiring information of neighboring femtocells and macrocells and determining an optimal frequency subband to be allocated to the femtocell based on information collected from the peripheral device information acquisition unit 110; And broadcasting the determined optimal frequency subband to the femtocell, wherein the femtocell resource allocation method is optimal for femtocells when applied in a Long Term Evolution (LTE) based cellular system environment using partial frequency reuse. Subbands can be allocated.

4 and 5 are graphs showing the performance of the macrocell user and the femtocell user according to the size of the FCR to obtain the optimal FCR size in the femtocell resource allocation scheme proposed in the present invention.

The simulation for the graph is assumed to be a system in which femtocell devices coexist in an LTE system, and a standard LTE system of 3GPP (3rd Generation Partnership Project) is used. First, 19 macrocells having an ISD of 500 m are configured, and 50 macro cell users exist in one macro cell. The femtocell base station was placed in a building having a size of 12mx12m in width and length, and was changed to 30 to 180 cells per macrocell, and femtocell users existed for each 3 femtocell users. Here, the macro cell user, the femtocell base station, and the femtocell user follow the uniform distribution.

All base stations operate in OFDMA technology and allocate subcarriers allowed to macrocell users and femtocell users according to a femtocell resource allocation scheme. With partial frequency reuse, the lower middle section of the macrocell is set to 63% of the macrocell coverage, and the macrocell base station uses omni-directional antennas in the center region and three-way antennas in the edge region. The power was set at 15W and 22W, respectively. All femtocells use 20mW transmit power. The channel model considers the path loss and shadowing according to the characteristics of SLS (System Level Simulation).

를 찾기 위한 것으로 제안된 펨토셀 자원 할당 방식에서 펨토셀 자원 할당을 위한 새로운 하위 구역 중, 가운데 영역인 FCR의 크기에 따른 매크로셀 유저들의 스루풋과 펨토셀 유저의 평균 채널 용량을 각각 나타낸 것이다.5 and 6 are equations 9

In the proposed femtocell resource allocation scheme, the throughput of the macrocell users and the average channel capacity of the femtocell users according to the size of the FCR, which is the middle region, are shown.

As shown in FIGS. 5 and 6, the performance according to the size of the FCR has a different tendency in terms of the macrocell user side and the femtocell user side, so that the existing resource allocation method is set as the threshold and the allowable range of the FCR size is set. FCR size for macrocell users and FCR size for femtocell users was calculated and applied to the system. In the present invention, the proposed femtocell resource allocation scheme is divided into two modes, mode 1 is advantageous for macrocell users, FCR size is 110% of MCR, mode 2 is favorable for femtocell users, and FCR size is 90% of MCR. Each was set in%.

7, 8, 9, 10, and 11 are graphs of simulation results showing the superiority of the performance of the present invention compared to the conventional method.

7 and 8 show the reception SINR CDF and throughput of the macro cell user, respectively, with the performance of the macro cell user.

As the proposed invention solves the interference problem existing in the femtocell resource allocation scheme, it improves the reception SINR performance of macrocell users and at the same time improves the channel capacity performance. Among the proposed inventions, it can be seen that Mode 1, which is advantageous for the macro cell user, shows the best performance. In addition, as the number of femtocells increases, the proposed invention shows better performance as it is less affected by the increase in femtocell number than conventional methods.

Compared to the conventional method, the proposed invention has less interference with the femtocell to the macrocell user, but because the interference between the femtocells is relatively higher, the reception SINR performance of the femtocell user is not good as shown in FIG. 9. However, when the proposed invention is used as shown in FIG. 10, since the frequency band allocated to the femtocell user is the largest, the proposed invention has the highest performance in terms of channel capacity of the femtocell user as shown in FIG. 11, and the femtocell user is also proposed in the proposed invention. Mode 2 in favor of the best performance. This performance result implies that the femtocell in the proposed invention shares the frequency band of the macrocell more than the conventional schemes and gives the least interference to the macrocell user.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations may be made by those skilled in the art to which the present invention pertains. It is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: femtocell resource allocation device
110: peripheral device information acquisition unit
120: femtocell resource allocation unit
130: femtocell resource broadcasting unit

Claims (9)

In a femtocell resource allocation apparatus,
Peripheral device information acquisition unit for obtaining information of the surrounding femtocell and macrocell;
A femtocell resource allocator configured to determine an optimal frequency subband to be allocated to the femtocell based on information collected from the peripheral device information acquirer; And
A femtocell resource broadcasting unit for broadcasting the determined optimal frequency subband to the femtocell
Femtocell resource allocation device is composed of. The method of claim 1,
The femtocell resource allocation device, when applied in a Long Term Evolution (LTE) based cellular system environment using partial frequency reuse, allocates the optimal frequency subband to the femtocell. The method of claim 1,
The peripheral device information acquisition unit,
Acquire the configuration state and channel usage information of the surrounding femtocell and information about the macrocell,
The information includes:
A femtocell resource allocation apparatus corresponding to a channel assignment state, an installed location, an access mode method, a number of femtocell APs, and a received signal strength of a macrocell, which are acquired through a wireless LAN or a radio frequency channel. The method of claim 1,
The femtocell resource allocation unit,
The femtocell resource allocation device, characterized in that to grasp the partial frequency reuse structure of the current macrocell based on the information received from the peripheral device information acquisition unit. 5. The method of claim 4,
The femtocell resource allocation device, characterized in that a new subzone is designed for femtocell resource allocation based on the identified partial frequency reuse structure of the macrocell. The method of claim 5,
The femtocell resource allocation device, characterized in that the location of the femtocell is determined in consideration of the designed subregion based on the information received from the peripheral device information acquisition unit. The method according to claim 6,
The femtocell resource allocation device, characterized in that the optimal frequency subband is allocated to the femtocell in consideration of the designed subregion and the identified femtocell location. In the femtocell resource allocation method,
Acquiring information of neighboring femtocells and macrocells;
Determining an optimal frequency subband to be allocated to the femtocell based on information collected from the peripheral device information acquisition unit; And
Broadcasting the determined optimal frequency subband to the femtocell.
Femtocell resource allocation method comprising a. 9. The method of claim 8,
The femtocell resource allocation method, when applied in an LTE-based cellular system environment using partial frequency reuse, allocates the optimal frequency subband to the femtocell.

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