KR20120011739A - Apparatus and method for providing system information in wireless communication system - Google Patents

Abstract

PURPOSE: A device for providing system information in a wireless communication system and a method thereof are provided to set system information change time different according to a base station type. CONSTITUTION: A change time checking unit(807) checks a super frame in which system information of a macro base station is changed. A controller(805) limits system information transmission of a small base station during the super frame. When the system information of the macro base station is not the super frame, the controller transmits the system information of the small base station. The small base station includes at least one of a pico base station, a femto base station, a micro base station, and a wireless relay station.

Description

Apparatus and method for providing system information in a wireless communication system {APPARATUS AND METHOD FOR PROVIDING SYSTEM INFORMATION IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for providing system information in a wireless communication system, and more particularly, to an apparatus and method for providing system information in a heterogeneous network.

Broadband wireless communication systems are evolving to provide users with various services such as broadcasting, multimedia video, and multimedia messages. In particular, next generation wireless communication systems are being developed to provide data services of 100 Mbps or more to users moving at high speed, and to provide data services of 1 Gbps or more to users moving at low speed.

In order to meet wireless service requirements for providing various services, a method for increasing network service capacity as well as user data service capacity is required. Accordingly, the wireless communication system can configure a heterogeneous network using a small base station of low power in order to increase network service capacity. For example, a heterogeneous network configured using a low power pico cell, a femto cell, and a wireless relay is configured as shown in FIG. 1.

1 illustrates a configuration of a heterogeneous network according to the prior art.

As shown in FIG. 1, the pico base stations 110 and 120, the femto base station 130, and the relay station 140 are installed in a macro cell operated by the macro base station 100.

The pico cells operated by the pico base stations 110 and 120 are installed in a hot zone having high data service demands, and the femto cells operated by the femto base station 130 are installed in an indoor office or home. The relay station 140 may be installed to supplement the service area of the macro cell.

The heterogeneous network configured as described above can increase network capacity at low cost as a plurality of small base stations form a small cell and reuse resources to provide a service.

Small base stations are closed subscriber grops (CSG) base stations that allow only specific users to access them, and open subscriber grops (OSG) base stations that allow all users to access them, as well as hybrids that combine closed and open features. Hybrid access) divided into base stations. The closed small base station only permits access of the mobile station to which it has been given specific authority. Accordingly, a mobile station that does not have access to the closed small base station must access the macro base station as shown in FIG. 2 even if it is located in the service area of the closed small base station.

2 illustrates signal interference in a heterogeneous network according to the prior art.

As illustrated in FIG. 2, the macro terminal 202 is connected to the macro base station 200 to receive a service. If the macro terminal 202 moves into the service area of the closed small base station 210, the macro terminal 202 does not have access rights of the closed small base station 210, and thus the closed small base station 210 The connection with the macro base station 200 is maintained within the service area of 210.

As described above, when the mobile station communicates with the macro base station in the small cell, the mobile station has a problem that it is difficult to maintain a connection with the macro base station due to interference from the small base station. Moreover, the mobile station cannot decode the system information of the macro base station transmitted in the resource structure of frequency reuse 1 due to the interference of the small base station, so that the system information of the macro base station cannot be confirmed.

It is therefore an object of the present invention to provide an apparatus and method for transmitting system information in a mobile network.

Another object of the present invention is to provide an apparatus and method for differently setting system information change time points according to base station types in a mobile network.

Another object of the present invention is to provide an apparatus and method for controlling a small base station of a mobile network not to transmit its system information at a time of changing system information of a macro base station.

It is still another object of the present invention to provide an apparatus and method for controlling a closed small base station of a mobile network not to transmit its system information at a time of changing system information of a macro base station.

Another object of the present invention is to provide an apparatus and method for transmitting system information of a macro base station at a time of changing system information of a macro base station in a small base station of a mobile network.

It is still another object of the present invention to provide an apparatus and method for transmitting system information of a macro base station at the time of changing system information of the macro base station in a closed small base station of a mobile network.

According to a first aspect of the present invention for achieving the objects of the present invention, a method for transmitting system information in a small base station of a heterogeneous network, the process of identifying a super frame in which the system information of the macro base station is changed And limiting system information transmission of the small base station during the super frame in which the system information of the macro base station is changed, and transmitting system information of the small base station if the system information of the macro base station is not a super frame in which the system information is changed. Characterized in that it comprises a process.

According to a second aspect of the present invention, a method for transmitting system information in a small base station of a heterogeneous network includes: checking a super frame in which system information of a macro base station is changed, and a super in which system information of the macro base station is changed. And transmitting system information of the macro base station during a frame, and transmitting system information of the small base station when the system information of the macro base station is not a super frame in which the system information of the macro base station is changed.

According to a third aspect of the present invention, an apparatus for transmitting system information in a small base station of a heterogeneous network includes a change time confirmation unit for checking a super frame in which the system information of the macro base station is changed, and the system information of the macro base station. And a controller configured to limit system information transmission of the small base station during the changed super frame and to control to transmit system information of the small base station when the system information of the macro base station is not a changed super frame. It is done.

According to a fourth aspect of the present invention, an apparatus for transmitting system information in a small base station of a heterogeneous network includes a change time check unit for checking a super frame in which system information of a macro base station is changed, and system information of the macro base station. And a controller that transmits system information of the macro base station during the changed super frame and controls to transmit system information of the small base station when the system information of the macro base station is not a changed super frame. do.

According to a fifth aspect of the present invention, a method for acquiring system information of a base station in a mobile station of a heterogeneous network includes: checking a super frame in which system information of a serving base station is changed; and changing system information of the serving base station; Determining whether the system information of the serving base station included in the super frame preceding the super frame can be decoded, and if the system information can be decoded, the serving through the super frame in which the system information of the serving base station is changed. And receiving the system information of the base station, and receiving the system information of the small base station if the system information cannot be decoded.

According to a sixth aspect of the present invention, an apparatus for acquiring system information of a base station in a mobile station of a heterogeneous network includes: a receiving unit for receiving a signal, a change time confirmation unit for confirming a super frame in which the system information of the serving base station is changed; When the system information of the serving base station included in the super frame preceding the super frame in which the system information of the serving base station is changed can be decoded, the system of the serving base station through the super frame in which the system information of the serving base station is changed. And a control unit for controlling to receive the system information of the small base station when the information is not received and the system information cannot be decoded.

As described above, when the small base station of a heterogeneous network does not transmit its own system information at the time of changing the system information of the macro base station or transmits the system information of the macro base station, the mobile station transmits the macro base station in the closed small cell. There is an advantage to maintain the connection with the.

1 is a diagram showing a configuration of a heterogeneous network according to the prior art;
2 illustrates signal interference in a heterogeneous network according to the prior art;
3 illustrates a frame configuration including a control channel according to the present invention;
4 is a diagram illustrating a procedure for reducing interference of system information with a macro base station in a small base station according to an embodiment of the present invention;
5 is a diagram illustrating a procedure for reducing interference of system information with a macro base station in a small base station according to another embodiment of the present invention;
6 is a diagram illustrating a procedure for receiving system information in a mobile station according to an embodiment of the present invention;
7 is a diagram illustrating a procedure for receiving SFH system information in a mobile station according to an embodiment of the present invention;
8 is a block diagram of a small base station according to the present invention; and
9 is a block diagram of a mobile station according to the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, the present invention describes a technique for transmitting system information in a heterogeneous network. Here, the small base station is a low power base station installed in the macro cell and includes a pico base station, a femto base station, a micro base station, and a wireless relay station.

In the following description, it is assumed that a wireless communication system provides a service through the IEEE 802.16m standard. In this case, the wireless communication system provides a service using a frame having a structure as shown in FIG. 3.

3 illustrates a frame configuration including a control channel according to the present invention.

As shown in FIG. 3, the super frame is composed of four frames, and one frame has a hierarchical frame structure composed of eight subframes.

When providing a service using a frame configured as described above, the base station transmits a broadcast control channel called a superframe header (SFH) through the first subframe of the superframe. In this case, the system information transmitted through the super frame header is transmitted through two control channels called primary SFH (P-SFH) and secondary SFH (S-SFH). For example, the P-SFH is transmitted once every superframe and transmits a limited amount of system information at a fixed location. The system information transmitted through the S-SFH is divided into three subpackets, and each subpacket is broadcast not overlapped periodically with a different transmission period.

The P-SFH includes S-SFH decoding information and S-SFH change count information. Here, the S-SFH change count includes version information of the system information transmitted through the S-SFH, and increases by 1 whenever any information transmitted through the S-SFH is changed. Accordingly, the mobile station confirms the system information being used in the super frame through the S-SFH corresponding to the S-SFH change count value confirmed through the P-SFH.

The wireless communication system also provides an S-SFH update procedure to reduce the power consumption of the mobile station. The S-SFH update procedure controls the base station to transmit the same S-SFH change count during an S-SFH change cycle. That is, the base station transmits the same system information during the S-SFH change cycle period through the S-SFH update procedure. For example, the base station changes the S-SFH change count only in the super frame determined using Equation 1 below. That is, the base station sets the starting point of the S-SFH change cycle interval using Equation 1 below.

Here, the SFN represents a super frame number, and the S-SFH change cycle represents a section in which the S-SFH change count of the base station is not changed. Here, the S-SFH change cycle must be larger than the S-SFH transmission period.

As described above, the base station changes the system information only in a specific super frame through the S-SFH update procedure. Accordingly, the mobile station decodes the SFH only in the super frame in which the S-SFH change count is changed to obtain system information of the base station. For example, when the mobile station operating in the sleep mode has a listening section in subframe units, the mobile station decodes the P-SFH only at the beginning of the S-SFH change cycle section, and during the S-SFH change cycle section. It is only activated in a listening section of a subframe unit.

In heterogeneous networks, the S-SFH change cyclic value is set differently for each base station type so that system information does not overlap for each base station type. However, when the S-SFH change cyclic value set differently for each base station type has a multiple relationship, system information may overlap even if the base stations have different base station types. Accordingly, the base station of the heterogeneous network determines the starting point of the S-SFH change cycle interval using Equation 2 below.

Here, the SFN indicates a super frame number, the Cell_Type indicates an integer corresponding to the base station type, and the S-SFH change cycle indicates a section in which the S-SFH change count of the base station is not changed. Indicates. Here, the S-SFH change cycle must be larger than the S-SFH transmission period.

In Equation 2, Cell_Type may be represented as in Table 1 below.

Base station type Cell_Type Macro BS (public) 0 Open femto BS (public) (S-SFH change cycle) / 2 Closed femto BS (non-public) (S-SFH change cycle) / 4 Hot-zone (public) 3 × (S-SFH change cycle) / 4

In Table 1, the S-SFH change cycle includes the minimum value of the S-SFH change cycle.

As described above, in the heterogeneous network, a time point for changing system information for each base station type is set differently. Even if the change point of the system information is different, the base stations of the heterogeneous network transmit the system information through the super frame header every time the super frame header is transmitted. In this case, the mobile station connected to the macro base station in the small cell is affected by the interference from the small base station. Accordingly, the closed small base station selectively transmits system information as shown in FIG. 4 to reduce the influence of interference to the mobile station connected to the base station of another base station type.

4 illustrates a procedure for reducing interference of system information with a macro base station in a small base station according to an embodiment of the present invention. Here, it is assumed that the small base station operates in a closed type.

Referring to FIG. 4, the small base station identifies a variable necessary for transmitting SFH system information of the macro base station coexisting in step 401. For example, the small base station identifies the start time of the S-SFH change cycle interval of the macro base station using Equation (2).

In step 403, the small base station determines whether a super frame in which system information of the macro base station is changed arrives. That is, the small base station checks whether the start time of the S-SFH change cycle interval for the macro base station arrives.

When the super frame in which the system information of the macro base station is changed arrives, the small base station proceeds to step 405 to limit the transmission of the super frame header (SFH) of the small base station during the corresponding super frame.

On the other hand, when the super frame in which the system information of the macro base station is changed does not arrive, the small base station proceeds to step 407 and transmits its super frame header (SFH) through the super frame.

The small base station then terminates this algorithm.

In the above-described embodiment, the closed small base station does not transmit its SFH system information through the super frame including the start time of the S-SFH change cycle interval for the macro base station.

In another embodiment, the closed small base station may transmit SFH system information of the macro base station through a super frame including the start time of the S-SFH change cycle interval for the macro base station, as shown in FIG. 5.

5 is a flowchart illustrating a procedure for reducing interference of system information with a macro base station in a small base station according to another embodiment of the present invention.

Referring to FIG. 5, in step 501, the small base station identifies SFH system information of the co-existing macro base station and a variable necessary for transmitting the system information. For example, the small base station receives SFH system information of the macro base station from the macro base station through a backbone. In addition, the small base station identifies the start time of the S-SFH change cycle interval of the macro base station using Equation (2).

In step 503, the small base station determines whether a super frame in which the system information of the macro base station is changed arrives. That is, the small base station checks whether the start time of the S-SFH change cycle interval for the macro base station arrives.

When the super frame in which the system information of the macro base station is changed arrives, the small base station proceeds to step 505 to generate an SFH transmission status indicator indicating that the SFH information transmitted by the macro base station includes the SFH system information of the macro base station. . For example, the SFH transmission status indicator is configured as shown in Table 2 below.

Field Size Syntax S-SFH Status 1 bit 0b0: Own information
0b1: Others information

In Table 2, when the super frame in which the system information of the macro base station is changed arrives, the small base station generates an SFH transmission status indicator set to 0b1.

In step 507, the small base station transmits SFH system information of the macro base station through the corresponding super frame. In this case, the small base station transmits the SFH transmission status indicator generated in step 505 to the P-SFH.

On the other hand, when the super frame in which the system information of the macro base station is changed does not arrive, the small base station proceeds to step 509 and generates an SFH transmission status indicator indicating that the SFH system information is transmitted. For example, the SFH transmission status indicator generates an SFH transmission status indicator set to 0b0 in the <Table 2>.

In step 511, the small base station transmits its own SFH system information through the corresponding super frame. In this case, the small base station transmits the SFH transmission status indicator generated in step 509 to the P-SFH.

The small base station then terminates this algorithm.

As described above, the closed small base station does not transmit its SFH system information at the start of the S-SFH change cycle interval of the macro base station to reduce the interference effect on the terminal connected to the macro base station while being located in its service area. Or transmits SFH system information of the macro base station.

In another embodiment, the closed small base station may not transmit its SFH system information at the start of the S-SFH change cycle interval of the open small base station or may transmit the SFH system information of the open small base station.

The mobile station may selectively receive system information of the small base station and the macro base station in consideration of the interference of the closed small base station.

6 illustrates a procedure for receiving system information in a mobile station according to an embodiment of the present invention.

Referring to FIG. 6, in step 601, the mobile station identifies a super frame indicating change of SFH system information of the serving base station. That is, the mobile station identifies the start time of the S-SFH change cycle interval of the serving base station. For example, the mobile station identifies the start time of the S-SFH change cycle interval of the serving base station using Equation (2).

Thereafter, the mobile station proceeds to step 603 to receive SFH system information of the serving base station included in a previous super frame of the super frame instructing the SFH system information change of the serving base station.

After receiving the SFH system information of the serving base station, the mobile station proceeds to step 605 to determine whether it is possible to decode the SFH system information of the serving base station. For example, the mobile station checks whether the SFH system information of the serving base station can be decoded by using a cyclic redundancy check (CRC) of the SFH system information.

If the SFH system information of the serving base station can be decoded, the mobile station recognizes that the influence of interference from the closed small base station is small. Accordingly, the mobile station proceeds to step 607 and receives the SFH system information of the serving base station through a super frame instructing to change the SFH system information of the serving base station.

On the other hand, when the SFH system information of the serving base station cannot be decoded, the mobile station recognizes that the interference effect from the closed small base station is severe. Accordingly, the mobile station proceeds to step 609 to receive the SFH system information of the closed small base station through the super frame instructing to change the SFH system information of the serving base station.

The mobile station then terminates this algorithm.

In the above-described embodiment, the mobile station selectively receives the SFH system information according to whether the SFH system information of the serving base station included in the previous super frame of the super frame indicating the change of the SFH system information of the serving base station can be decoded.

In another embodiment, the mobile station may selectively receive SFH system information according to whether the SFH system information provided from the serving base station can be decoded during the super frame instructing the change of the SFH system information of the serving base station. That is, the mobile station stores the signal of the corresponding subframe in the super frame instructing the SFH system information change of the serving base station. Then, when the mobile station cannot decode the SFH system information provided from the serving base station, the mobile station decodes the SFH system information of the neighboring base station from the stored signal.

The following description describes a method for obtaining SFH in a mobile station. That is, a method of obtaining system information of a base station by receiving P-SFH and S-SFH in the mobile station will be described.

7 illustrates a procedure for receiving SFH system information in a mobile station according to an embodiment of the present invention.

Referring to FIG. 7, the mobile station receives and decodes the P-SFH in the super frame to receive the SFH in step 701.

After decoding the P-SFH, the mobile station proceeds to step 703 to check the S-SFH transmission status indicator information among the information included in the P-SFH.

In step 705, the mobile station determines whether the S-SFH transmission status indicator indicates SFH system information transmission of the closed small base station.

If the S-SFH transmission status indicator indicates the SFH system information transmission of the closed small base station, the mobile station proceeds to step 707 to receive the S-SFH system information of the closed small base station.

On the other hand, if the S-SFH transmission status indicator indicates the SFH system information transmission of the macro base station, the mobile station proceeds to step 709 to receive the S-SFH system information of the macro base station.

The mobile station then terminates this algorithm.

The following description describes the configuration of a small base station for transmitting system information.

8 shows a block configuration of a small base station according to the present invention.

As shown in FIG. 8, the small base station includes a duplexer 801, a receiver 803, a controller 805, a change point checking unit 807, a storage unit 809, a wired interface 811, and a transmitter 813. It is configured to include.

The duplexer 801 transmits a transmission signal provided from the transmitter 813 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the receiver 803.

The receiver 803 converts and demodulates a high frequency signal provided from the duplexer 801 to a baseband signal. The receiver 803 may include an RF processing block, a demodulation block, a channel decoding block, and the like. For example, the RF processing block converts a high frequency signal provided from the duplexer 801 into a baseband signal and outputs the baseband signal. The demodulation block includes a fast fourier transform (FFT) operator for extracting data contained in each subcarrier from a signal provided from the RF processing block. The channel decoding block includes a demodulator, a deinterleaver and a channel decoder.

The controller 805 controls the overall operation of the small base station. For example, the controller 805 limits the SFH transmission of the small base station during the super frame including the start point of the S-SFH change cycle interval of the macro base station provided from the change time confirmation unit 807. For another example, the controller 805 controls to transmit the SFH of the macro base station during the super frame including the start point of the S-SFH change cycle interval of the macro base station provided from the change time confirmation unit 807.

The change point confirming unit 807 checks a point in time at which system information of the small base station and the macro base station coexisting with the small base station is changed under the control of the control unit 805. For example, the change point checking unit 807 checks the starting point of the S-SFH change cycle interval of the small base station and the macro base station coexisting with the small base station using Equation (2). That is, the point in time at which the system information is changed indicates the start point of the S-SFH change cycle.

The storage unit 809 stores information necessary for the operation of the small base station. For example, the storage unit 809 stores a variable for checking the system information change time of the small base station in the change time confirmation unit 807. In addition, the storage unit 809 stores SFH system information of the macro base station provided from the macro base station through the wired interface 811.

The wired interface 811 transmits and receives a signal with neighbor base stations through a wired network. For example, the wired interface 811 transmits and receives a signal with a macro base station through a backbone network.

The transmitter 813 converts data and control messages to be transmitted to the mobile station into encoded and high frequency signals and transmits them to the duplexer 801. For example, the transmitter 813 may include a channel code block, a modulation block, an RF processing block, and the like. Here, the channel code block includes a modulator, an interleaver and a channel encoder. The modulation block is composed of an Inverse Fast Fourier Transform (IFFT) operator for mapping each subcarrier in a signal provided from the channel code block. The RF processing block converts the baseband signal provided from the modulation block into a high frequency signal and outputs it to the duplexer 801.

In the above-described configuration, the controller 805 may be a protocol controller and may perform a function of the change point confirming unit 807. In the present invention, it is separately configured to describe each function separately. Therefore, in actual implementation, all or some of them may be configured to be processed by the controller 805.

The following description describes the configuration of a mobile station for obtaining system information of a base station.

9 shows a block configuration of a mobile station according to the present invention.

As shown in FIG. 9, the mobile station includes a duplexer 901, a receiver 903, a controller 905, a change time checker 907, and a transmitter 909. FIG.

The duplexer 901 transmits a transmission signal provided from the transmitter 909 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the receiver 903.

The receiver 903 converts and demodulates a high frequency signal provided from the duplexer 901 into a baseband signal. The receiver 903 may include an RF processing block, a demodulation block, a channel decoding block, and the like. For example, the RF processing block converts a high frequency signal provided from the duplexer 901 into a baseband signal and outputs the baseband signal. The demodulation block includes an FFT operator for extracting data carried on each subcarrier from a signal provided from the RF processing block. The channel decoding block includes a demodulator, a deinterleaver and a channel decoder.

The controller 905 controls the overall operation of the mobile station. For example, the controller 905 controls to receive the SFH from the serving base station at the time of changing the system information of the serving base station provided from the change point confirming unit 907. At this time, the controller 905 determines the base station to receive the system information according to whether or not the SFH received through the previous super frame of the super frame is changed as shown in FIG.

The change point checking unit 907 checks a point in time at which the system information of the serving base station is changed under the control of the control unit 905. For example, the change point checking unit 907 checks the starting point of the S-SFH change cycle interval of the serving base station using Equation (2). That is, the point in time at which the system information is changed indicates the start point of the S-SFH change cycle.

The transmitter 909 converts data and control messages to be transmitted to the base station into encoded and high frequency signals and transmits the converted data to the duplexer 901. For example, the transmitter 909 may include a channel code block, a modulation block, an RF processing block, and the like. Here, the channel code block includes a modulator, an interleaver and a channel encoder. The modulation block includes an IFFT operator for mapping each subcarrier in a signal provided from the channel code block. The RF processing block converts the baseband signal provided from the modulation block into a high frequency signal and outputs it to the duplexer 901.

In the above-described configuration, the control unit 905 may be a protocol control unit and may perform a function of the change time confirmation unit 907. In the present invention, it is separately configured to describe each function separately. Therefore, in actual implementation, all or some of them may be configured to be processed by the controller 905.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (26)

In the method for transmitting system information in a small base station of a heterogeneous network,
Checking a super frame in which the system information of the macro base station is changed;
Limiting transmission of system information of the small base station during a super frame in which system information of the macro base station is changed;
And transmitting system information of the small base station when the system information of the macro base station is not a super frame in which the information is changed.
The method of claim 1,
The small base station includes at least one of a pico base station, a femto base station, a micro base station and a wireless relay station.
The method of claim 1,
The process of checking the super frame,
It includes a process of checking the start time of the S-SFH (Secondary-Super Frame Header) change cycle interval of the macro base station,
The S-SFH change cycle section, characterized in that it comprises a section in which the system information of the macro base station is not changed.
The method of claim 1,
The process of checking the super frame,
And identifying a super frame in which system information of the macro base station is changed by using Equation 3 below.
[Equation 3]

Here, the SFN is a super frame number, the Cell_Type is an integer corresponding to a base station type, and the S-SFH change cycle indicates a section in which system information of the base station is not changed.
In the method for transmitting system information in a small base station of a heterogeneous network,
Checking a super frame in which the system information of the macro base station is changed;
Transmitting system information of the macro base station during a super frame in which system information of the macro base station is changed;
And transmitting system information of the small base station when the system information of the macro base station is not a super frame in which the information is changed.
6. The method of claim 5,
The small base station includes at least one of a pico base station, a femto base station, a micro base station and a wireless relay station.
6. The method of claim 5,
The process of checking the super frame,
It includes a process of checking the start time of the S-SFH (Secondary-Super Frame Header) change cycle interval of the macro base station,
The S-SFH change cycle section, characterized in that it comprises a section in which the system information of the macro base station is not changed.
6. The method of claim 5,
The process of checking the super frame,
A method comprising identifying a super frame in which system information of a macro base station is changed by using Equation 4 below.
[Equation 4]

Here, the SFN is a super frame number, the Cell_Type is an integer corresponding to a base station type, and the S-SFH change cycle indicates a section in which system information of the base station is not changed.
6. The method of claim 5,
The process of transmitting the system information of the macro base station,
Generating an SFH transmission status indicator indicating transmission of system information of the macro base station;
And transmitting system information of the macro base station including the SFH transmission status indicator.
An apparatus for transmitting system information in a small base station of a heterogeneous network,
A change point checking unit for checking a super frame in which the system information of the macro base station is changed;
Control unit for restricting the transmission of the system information of the small base station during the super frame, the system information of the macro base station is changed, and controls to transmit the system information of the small base station, if the system information of the macro base station is not a super frame is changed Device comprising a.
The method of claim 10,
The small base station includes at least one of a pico base station, a femto base station, a micro base station and a wireless relay station.
The method of claim 10,
The change point confirming unit may identify a start point of a secondary-super frame header (S-SFH) change cycle section of the macro base station,
The S-SFH change cycle section, characterized in that it comprises a section in which the system information of the macro base station is not changed.
The method of claim 10,
The change point confirming unit checks a super frame in which the system information of the macro base station is changed using Equation 5 below.
&Quot; (5) &quot;

Here, the SFN is a super frame number, the Cell_Type is an integer corresponding to a base station type, and the S-SFH change cycle indicates a section in which system information of the base station is not changed.
An apparatus for transmitting system information in a small base station of a heterogeneous network,
A change point checking unit for checking a super frame in which the system information of the macro base station is changed;
A control unit which transmits system information of the macro base station during a super frame in which system information of the macro base station is changed, and controls to transmit system information of the small base station when the system information of the macro base station is not a super frame in which the system information of the macro base station is changed. Device comprising a.
The method of claim 14,
The small base station includes at least one of a pico base station, a femto base station, a micro base station and a wireless relay station.
The method of claim 14,
The change point confirming unit may identify a start point of a secondary-super frame header (S-SFH) change cycle section of the macro base station,
The S-SFH change cycle section, characterized in that it comprises a section in which the system information of the macro base station is not changed.
The method of claim 14,
And the change point confirming unit checks a super frame in which the system information of the macro base station is changed using Equation 6 below.
&Quot; (6) &quot;

Here, the SFN is a super frame number, the Cell_Type is an integer corresponding to a base station type, and the S-SFH change cycle indicates a section in which system information of the base station is not changed.
The method of claim 14,
And the control unit generates an SFH transmission status indicator indicating transmission of system information of the macro base station, and controls to transmit system information of the macro base station including the SFH transmission status indicator.
A method for obtaining system information of a base station in a mobile station of a heterogeneous network,
Identifying a super frame in which the system information of the serving base station is changed;
Checking whether the system information of the serving base station included in the super frame preceding the super frame in which the system information of the serving base station is changed can be decoded;
When the system information can be decoded, receiving system information of the serving base station through a super frame in which system information of the serving base station is changed;
If it is impossible to decode the system information, receiving the system information of the small base station.
The method of claim 19,
The small base station includes at least one of a pico base station, a femto base station, a micro base station and a wireless relay station.
The method of claim 19,
The process of checking the super frame,
It includes a process of checking the start time of the S-SFH (Secondary-Super Frame Header) change cycle interval of the serving base station,
The S-SFH change cycle section, characterized in that it comprises a section in which the system information of the serving base station is not changed.
The method of claim 19,
The process of checking the super frame,
A method comprising identifying a super frame in which system information of a serving base station is changed using Equation 7 below.
&Quot; (7) &quot;

Here, the SFN is a super frame number, the Cell_Type is an integer corresponding to a base station type, and the S-SFH change cycle indicates a section in which system information of the base station is not changed.
An apparatus for acquiring system information of a base station in a mobile station of a heterogeneous network,
A receiver for receiving a signal,
A change point checking unit for checking a super frame in which the system information of the serving base station is changed;
When the system information of the serving base station included in the super frame preceding the super frame in which the system information of the serving base station is changed can be decoded, the system information of the serving base station through the super frame in which the system information of the serving base station is changed. And a control unit for controlling to receive the system information of the small base station when the system information cannot be decoded.
24. The method of claim 23,
The small base station includes at least one of a pico base station, a femto base station, a micro base station and a wireless relay station.
24. The method of claim 23,
The change time check unit, characterized in that to confirm the start time of the secondary-super frame header (S-SFH) change cycle interval of the serving base station,
The S-SFH change cycle section, characterized in that it comprises a section in which the system information of the serving base station is not changed.
24. The method of claim 23,
The change point confirming unit checks a super frame in which the system information of the serving base station is changed using Equation (8).
&Quot; (8) &quot;

Here, the SFN is a super frame number, the Cell_Type is an integer corresponding to a base station type, and the S-SFH change cycle indicates a section in which system information of the base station is not changed.

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