JP2013157892A - Communication system, base station devices, and blank section setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system, base station devices, and a blank section setting method which allow the position of a blank section to be suitably set between base station devices.SOLUTION: A communication system of the present invention comprises a plurality of base station devices 1. The base station devices 1 each include an ABS pattern setting unit 22 which sets an ABS pattern and a transmission and reception unit 12 which receives information on current ABS status transmitted from an interfered side base station device in response to notification of an ABS pattern. An ABS pattern setting unit 22 sets for each of a plurality of subframes included in a radio frame an order of settings in which ABS positions are set, and, if information on current ABS status from the interfered side base station device is negative notification, further sets an ABS position for the next subframe determined by the order of settings among the subframes which have not been set as ABS positions yet, while leaving the already set ABS positions intact.

Description

  The present invention relates to a communication system, a base station apparatus, and a blank section setting method.

A cellular communication system is constructed by installing a large number of high-power macro base station apparatuses that form a relatively wide wireless communication area called a macro cell.
In communication standards such as LTE (Long Term Evolution), it is assumed that a femto base station apparatus that forms a femto cell in a narrower range than the macro cell is installed in addition to the macro base station apparatus (see Non-Patent Document 1). . The femto base station apparatus is a base station apparatus that is smaller than the macro base station apparatus.

  The macro base station apparatus is installed by a telecommunications carrier that manages the communication system, whereas the femto base station apparatus is installed mainly by individuals or companies who are customers (users) of the communication system. By installing the femto base station apparatus in, for example, a house in a macro cell or a business office of a company, it is possible to improve the communication environment at the installation site of the femto base station apparatus.

  In LTE, apart from the femto base station apparatus, it is also considered to install a small base station apparatus (pico base station apparatus) that forms a cell (pico cell) having a narrower range than the macro cell (Non-patent Document 2). reference). The pico base station apparatus is installed in a place where the terminals are expected to be crowded in the macro cell, and by providing an area in which the terminals are preferentially connected to the pico base station apparatus over the macro base station apparatus. It is possible to reduce the communication load of the macro base station apparatus and improve the throughput of the entire system.

In LTE, both the macro base station apparatus and the pico base station apparatus described above are also called eNodeBs (eNBs), and all the subscriber terminals of the communication system are accessible. That is, it can be said that the macro base station apparatus and the pico base station apparatus are public base station apparatuses.
On the other hand, the femto base station apparatus is also called a home eNB (HeNB), and it is possible to limit terminals that can access the femto base station apparatus so that the installer of the femto base station apparatus can use it with priority. . That is, the femto base station apparatus is a base station apparatus that can be used privately.

Here, the femto base station apparatus which forms a narrow cell is installed in a macro cell or a pico cell. For this reason, it is conceivable that cells of three types of base station apparatuses cause interference with each other.
As described above, the pico cell is installed to improve the throughput of the entire system, and the terminal is set so as to connect with priority over the macro cell. Further, the femtocell is set so that the terminal connection is given priority over the picocell or the macrocell, which is a public base station device, mainly for the purpose of private use. Therefore, the priority in terminal connection generally increases in the order of femtocell, macrocell, and picocell.
Since the terminal should be connected to the higher priority, if there are two cells causing interference, the cell with the lower priority becomes the interfering cell.

When interference occurs between cells, it becomes difficult for the terminal side to receive a control signal or the like in a radio frame, resulting in inconvenience such as failure to maintain communication.
Therefore, as a measure for suppressing the above-described interference, it is proposed that the interfering cell sets a blank interval that can avoid interference with the interfered cell in its available resources. Yes.
The interfering cell can reduce interference to the interfered cell in the blank section by setting a section in which the interference to the interfered cell is to be avoided as a blank section.
This blank section is useful for protecting signals such as control signals transmitted from other neighboring base station apparatuses. The blank period is useful not only for protection of control signals but also in various situations where it is desired to avoid inter-cell interference in some radio resources.

Since the blank interval set by the interfering cell is intended to be actively used by the interfered cell in the interval corresponding to the blank interval, the interfering cell has a set position where the blank interval is set. It is necessary to recognize it.
For this reason, in the following Non-Patent Document 3, the blank interval that the interfering base station device that is to be set is transmitted from the interfering base station device that is trying to set the blank interval to the interfered base station device. Information (ABS Information) that contains information about the set position is specified. In addition, information (ABS Status) including information indicating whether or not the setting position of the blank section is appropriate is transmitted from the interfered base station apparatus to the interfering base station apparatus.
The interfering base station apparatus can recognize the set position of the blank section by acquiring information related to the set position of the blank section.

3GPP, "TS22.220 V10.3.0 Service requirements for Home Node B (HNB) and Home eNode B (HeNB)", 2010-06 3GPP, "TS36.104 V10.0.0 Base Station (BS) radio transmission and reception", 2010-09 3GPP, "TS36.423 V10.2.0 X2 application protocol", 2011-06

  Here, the information transmitted from the interfered base station apparatus to the interfering base station apparatus includes information indicating suitability for the setting position of the blank section that the interfering base station apparatus is to set, It is not shown whether the position should be set. For this reason, the interfering base station apparatus can recognize that the setting position indicated by the information regarding the setting position of the blank section cannot be used, but does not know at which position the setting position of the blank section should be set.

For this reason, in the presence of a plurality of base station apparatuses having different priorities as described above, the setting position of the blank section is set to be the same with other base station apparatuses because of the common interference relationship. Even if there was a case, it could not be set appropriately.
As described above, in the conventional technique, since it is not known to which position the set position of the blank section should be set, it may be difficult to set the blank section at an appropriate position.

  The present invention has been made in view of such circumstances, and provides a communication system, a base station apparatus, and a blank section setting method capable of suitably setting a setting position of a blank section between base station apparatuses. The purpose is to do.

(1) The present invention for achieving the above object is a communication system including a plurality of base station apparatuses that communicate using radio frames partitioned by a plurality of unit sections, wherein the base station apparatus A setting unit that sets a set position in the radio frame of the blank section set for the interfered base station apparatus that causes interference by the unit section, and a determination result regarding the suitability of the set position by the interfered base station apparatus A setting unit configured to set the setting position assigned to each of the plurality of unit sections included in the radio frame when the determination result is negative. The set position is set for the next unit section determined based on the order, and the interfered base station device in the interfered base station device among the base station devices. Base station apparatuses having the same connection priority by the terminal apparatus to each other use the same setting order as the setting order for setting the setting position for the interfered base station apparatus. Yes.

According to the communication system configured as described above, the base station apparatus sets the setting position for the next unit interval determined based on the setting order when the determination result is negative. By repeating the setting position setting until a setting position that can receive a determination result indicating that the interfering base station apparatus is suitable can be set. For this reason, if the setting position of the blank section is set according to the setting order, the setting position is always set in the same pattern.
In the present invention, among the plurality of base station apparatuses, the base station apparatuses having the same priority of connection by the terminal apparatus to the interfered base station apparatus in the interfered base station apparatus are the same as the interfered base station. Since the same setting order is used for the setting order for setting the setting position with respect to the apparatus, the priority of the interfered base station apparatus is the same, so that the base station apparatuses having a common interference relationship with each other The setting positions of the blank sections can be made to coincide with each other. As a result, the position of the blank section by each of the plurality of base station devices can be set appropriately.

(2) When the determination result is negative, the setting unit leaves the set position of the already set blank section as it is, and among the unit sections not yet set as the set position, according to the setting order It is preferable that the set position of the blank section is further set with respect to the determined next unit section. In this case, the next set position may be added without changing the already set position. Easy to set up.

(3) The base station apparatuses having different priorities of the interfered base station apparatuses may have different priorities between the base station apparatuses. If the setting position of the blank section is the same between these base station devices, one base station device with low priority is set by the other base station device with high priority with respect to the interfered base station device. A blank section is set in the blank section to be performed. Then, there is a possibility that the blank section set by itself is not effectively used by the other base station apparatus.
For this reason, when the plurality of base station devices having different connection priorities by the terminal devices are the interfered base station devices, the setting unit is configured to set the set position for each of the interfered base station devices. It is preferable to use different setting orders for the setting order.
In this case, the setting unit uses a different setting order for each of a plurality of interfered base station apparatuses having different priorities, and thus is set for each of a plurality of interfered base station apparatuses having different priorities. The setting position of the blank section can be set differently. As a result, it is possible to prevent setting a blank section that cannot be used effectively.

(4) Furthermore, when the setting unit cancels the setting position, the setting unit may sequentially cancel the setting position in an order reverse to the setting order at the time of setting.

(5) Further, the present invention is a base station apparatus that communicates using radio frames partitioned by a plurality of unit sections, and is a blank section set for an interfered base station apparatus that the own apparatus interferes with. A setting unit configured to set a setting position in the radio frame for each unit section; and an acquisition unit configured to acquire a determination result regarding suitability of the setting position by the interfered base station device, wherein the setting unit includes the determination If the result is negative, the setting position is set for the next unit section determined based on a setting order for setting the setting position assigned to each of the plurality of unit sections included in the radio frame. In addition, among the plurality of other base station apparatuses other than the own apparatus, the priority of connection by the terminal apparatus to the interfered base station apparatus in the interfered base station apparatus is the same as each other Between one other base station apparatus, the procedure for setting for setting the set position for the interfered base station apparatus is characterized by using the same setting order together.

(6) The present invention is a base station apparatus that performs communication using radio frames partitioned by a plurality of unit sections, and the radio in a blank section that is set for an interfered base station apparatus that the apparatus itself interferes with A setting unit configured to set a setting position in a frame for each unit section; and an acquisition unit configured to acquire a determination result regarding suitability of the setting position by the interfered base station device, wherein the setting unit If negative, the setting position is set for the next unit section determined based on the setting order for setting the setting position assigned to each of the plurality of unit sections included in the radio frame. When a plurality of base station devices having different connection priorities of terminal devices are used as the interfered base station devices, The procedure for setting for setting a setting position, it is preferable to use different settings order from each other.

(7) Further, the present invention provides a setting in the radio frame of a blank section that is set for an interfered base station apparatus that causes interference by a base station apparatus that communicates using radio frames partitioned by a plurality of unit sections. A position setting method, a setting order setting step for setting a setting order for setting the setting position assigned to each of the plurality of unit sections included in the radio frame, and a blank for each unit section A setting step for setting a position of a section; an acquisition step for acquiring a determination result regarding suitability of the setting position by the interfered base station device; and a step of repeatedly executing the setting step and the receiving step. In the setting step, when the determination result is negative, a previous unit interval determined based on the setting order is determined. The setting order is set, and the setting order setting step includes a step of connecting a terminal device to the interfered base station device in the interfered base station device among a plurality of other base station devices other than the own device. A setting order for setting the setting position for the interfered base station apparatus between base station apparatuses having the same priority is set to the same order setting.

  According to the base station apparatus and method configured as described above, the set position of the blank section can be suitably set as described above.

  As described above, according to the present invention, the setting position of the blank section can be suitably set between base station apparatuses.

It is the schematic which shows the structure of the radio | wireless communications system of this embodiment. It is the figure which showed the priority of the connection for a general user (terminal device) regarding each base station apparatus. It is the figure which showed the network between base stations (wired network) which connects each base station apparatus of a macro base station apparatus, a pico base station apparatus, and a femto base station apparatus (CSG femto base station apparatus or Open femto base station apparatus). . It is a figure which shows the structure of each uplink and downlink radio frame in LTE. It is a figure which shows the detailed structure of DL frame (transmission frame of a base station apparatus). It is a figure which shows an example when ABS is set to the radio | wireless frame of a macro base station apparatus when there exists a possibility that interference may arise between a macro base station apparatus and a pico base station apparatus. It is the figure which showed the aspect of transmission / reception of the information regarding the ABS information which a base station apparatus performs. It is a block diagram which shows the structure of the macro base station apparatus of this embodiment. It is a figure which shows an example of the relationship between the base station apparatus of the interfering side, and the base station apparatus of the interfered side. It is a figure for demonstrating the aspect in which a macro base station apparatus sets an ABS pattern, (a) is when adding to the said ABS pattern as a setting position of ABS, when a macro base station apparatus sets an ABS pattern The setting order of each subframe is shown. Further, (b) corresponds to (a), and the result of the determination when the pico base station apparatus determines whether or not each subframe in the radio frame can be used as an ABS by another base station apparatus. An example is shown. (C) shows the setting aspect of the ABS pattern in the case where it is set as shown in (a) and (b) step by step. It is the figure which illustrated the pattern of the some setting order. It is a figure which shows an example of the relationship between the base station apparatus of an interference side, and the base station apparatus of the interfered side, The other example different from FIG. 9 is shown. (A) has shown the setting order of the ABS pattern with respect to the pico base station apparatus when a macro base station apparatus sets an ABS pattern. Further, (b) shows the ABS pattern setting order for the pico base station apparatus and the ABS pattern setting order for the macro BS 1a when the CSG_Femto base station apparatus sets the ABS pattern. (A) shows an example of a determination result when the pico base station apparatus determines whether or not each subframe in a radio frame can be used as an ABS by another base station apparatus, and the macro base station in this case It is a figure which shows the aspect of the setting of the ABS pattern with respect to the pico base station apparatus by an apparatus, (b) is a macro base station apparatus using as an ABS by another base station apparatus about each sub-frame in a radio | wireless frame. It is a figure which shows an example of the determination result at the time of determining availability, and the aspect of the setting of the ABS pattern with respect to the macro base station apparatus by the CSG_femto base station apparatus in this case.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[1. Overall configuration of communication system]
FIG. 1 is a schematic diagram illustrating a configuration of a wireless communication system according to the present embodiment. This communication system is a cell system including a plurality of base station apparatuses (BSs) 1. The radio communication system according to the present embodiment is, for example, a system for a mobile phone to which LTE is applied. Communication between each base station apparatus 1 and a terminal apparatus (UE: User Equipment) 2 is based on LTE. Is done. However, the communication method is not limited to LTE.

The plurality of base station apparatuses 1 constituting the communication system include, for example, a plurality of macro base station apparatuses (Macro Base Stations; MBS) 1a that form a communication area (macro cell) MC having a size of several kilometers, and a pico cell PC. And a femto base station device (FBS) 1c that forms a femtocell FC.
Hereinafter, the macro base station apparatus is referred to as a macro BS, the pico base station apparatus is referred to as a pico BS, and the femto base station apparatus is referred to as a femto BS.

  One or a plurality of pico BSs 1b are installed in the macro cell. Similar to the macro BS 1a, the pico BS 1b is mainly installed by a communication carrier. By preferentially connecting the terminal device 2 in the macro cell MC to the pico BS 1b instead of the macro BS 1a, the communication load on the macro BS 1a can be reduced, and the throughput of the entire system can be improved.

  One or more femto BSs 1c are also installed in the macro cell and / or the pico cell. The femto BS 1c is installed mainly by individuals or companies who are customers (users) of the communication system. By installing the femto BS 1c, it is possible to improve the communication environment at the place where the femto base station apparatus is installed.

  Both the femtocell FC and the picocell PC have a communication area narrower than that of the macrocell MC. However, as the names “femto” and “pico” indicate, the femtocell FC is generally narrower than the picocell PC.

  In LTE, the macro BS 1a and the pico BS 1b are both base station apparatuses called eNBs (or simply NBs). Since the macro BS 1a and the pico BS 1b are installed by a telecommunications carrier, all subscriber terminals of the communication system can access unless there are special circumstances. That is, it can be said that the macro BS 1a and the pico BS 1b are public base station apparatuses. And it is a base station apparatus (small cell is formed) smaller than macro BS1a.

  On the other hand, the femto BS 1c is a base station device called HeNB (or simply HNB). The femto BS 1c is owned and / or installed by an individual or company who is a customer (user) of the communication system. That is, it can be said that the femto BS 1c is a base station apparatus that can be privately used by an individual or a company.

The femto BS 1c can restrict the terminal devices 2 that can access the femto BS 1c so that the installer of the femto BS 1c or the related parties can use it preferentially. This limitation is realized by an access mode set in the base station apparatus 1.
The access mode is a mode for the base station device 1 to regulate restrictions on wireless connection by the terminal device 2. There are three types of access modes: an open access mode, a closed access mode, and a hybrid mode. The base station apparatus is operated in any one of these three different access modes.

  The open access mode is a mode in which all terminal devices 2 can be connected. Since the macro BS 1a and the pico BS 1b installed by the communication carrier are highly public, they are usually operated in the open access mode. Therefore, all the subscriber terminal apparatuses 2 of the communication system can access the macro BS 1a or the pico BS 1b.

The closed access mode is a mode in which connection is permitted only to the terminal device 2 registered as the terminal device 2 that can use the base station device 1 set in this mode. Registration of the terminal device 2 may be performed in the base station device 1 set in the closed access mode, or may be performed in another device to which the base station device 1 can be connected.
Hereinafter, the term “femto BS1c” simply refers to the femto BS1c set in the closed access mode.
When it is particularly desired to indicate that the femto BS 1c is the femto BS 1c set in the closed access mode, the femto BS 1c set in the closed access mode may be referred to as a “CSG (Closed Subscriber Group) femto BS 1c”. is there.

In the hybrid mode, basically all terminal devices 2 can be connected, but the registered terminal device 2 is favored over the unregistered terminal device 2, and the unregistered terminal device 2 is connected. This mode may not be possible.
The femto BS 1c set to the open access mode functions as a public base station device. Hereinafter, the femto BS 1c set in the open access mode is referred to as an “Open femto BS”.
Note that the femto BS 1c set to the hybrid mode may be regarded as a CSG femto BS or an Open femto BS.

  FIG. 2 shows connection priorities for general users (terminal devices 2) with respect to each of the base station devices. The priority of the connection by the terminal device 2 in each base station device relatively indicates the degree of indicating to which base station device the terminal device 2 is preferentially connected when connecting to each base station device. This is set for each base station apparatus. As shown in the figure, among the macro BS 1a, the pico BS 1b, the CSG femto BS 1c, and the Open femto BS 1c-1, the priority of the connection is the highest in the Open femto BS 1c-1, followed by the pico BS 1b, the macro BS 1a, They are set in the order of CSG femto BS1c.

When there are a plurality of base station devices to which the terminal device 2 can be connected, the terminal device 2 is preferentially connected to the one with the higher connection priority.
Normally, when there are a plurality of connectable base station apparatuses, the terminal apparatus 2 connects to the base station with the highest signal reception power. For example, when the terminal device 2 can be connected to a plurality of macro BSs 1a, a connection (handover) to the base station device having the highest signal reception power is performed.

  On the other hand, for example, when the terminal device 2 can be connected to the macro BS 1a and the pico BS 1b, the reception power of the signal transmitted from the pico BS 1b is more than the reception power of the signal transmitted from the macro BS 1a. Even if it is slightly smaller, the terminal device 2 is connected to the pico BS 1b having a higher priority. That is, the terminal device 2 adds a predetermined value to the actual received power level for the signal power transmitted from the higher-priority pico BS 1b so that it is larger than the actual received power level. It is considered. Thereby, the terminal device 2 is preferentially connected to the pico BS 1b having a higher priority. This is to reduce the load on the macro BS 1a by connecting as many terminal devices 2 as possible to the pico BS 1b forming the pico cell PC smaller than the macro cell MC.

  Similarly, when the terminal device 2 can be connected to the pico BS 1b and the Open femto BS 1c-1, the reception power of the signal transmitted from the Open femto BS 1c-1 is higher than the reception power of the signal transmitted from the pico BS 1b. Even if it is slightly smaller, the terminal device 2 is connected to the higher-priority Open femto BS1c-1. This is to reduce the load on the pico BS 1b by connecting as many terminal devices 2 as possible to the open femto BS 1c-1 that forms a femto cell FC smaller than the pico cell PC.

  Further, a general terminal device 2 that is not permitted to connect to the CSG femto BS 1c cannot connect to the CSG femto BS 1c even if it is located in the femto cell FC formed by the CSG femto BS 1c. That is, even when the reception power of the signal transmitted from the CSG femto BS 1c is larger than the reception power of the signal transmitted from the macro BS 1a, the pico BS 1b, or the Open femto BS 1c-1, the terminal device 2 has priority. It is connected to the macro BS 1a, pico BS 1b, or Open femto BS 1c-1 having a high degree.

  In addition, when the priority (type) of the some base station apparatus which can connect the terminal device 2 is the same, the terminal device 2 connects to the base station with the highest received signal power as usual.

FIG. 3 shows an inter-base-station network (wired network) connecting base station apparatuses of the macro BS 1a, the pico BS 1b, and the femto BS 1c (CSG femto BS or Open femto BS). The macro BS 1a and the pico BS 1b, which are eNBs, are connected to an MME (Mobility Management Entity) via a line 6 using a communication interface called an S1 interface. The MME 3 is a node that manages the position and the like of the terminal device 2 and performs processing for movement management of each terminal device 2.
Further, the eNBs are connected to each other via a line 7 using a communication interface called an X2 interface, and communication for information exchange can be directly performed between the eNBs. However, in the current standard, the femto BS 1c cannot have an X2 interface.
In addition, the connection by X2 interface is not restricted to the connection shown in FIG. 2, It can provide between arbitrary eNBs.

A femto BS 1 c (CSG femto BS or Open femto BS), which is a HeNB, is connected to the MME 3 via a HeNB gateway (GW) 5. The MME 3 and the gateway 5 and the gateway 5 and the femto BS 1c are also connected by lines 6 using communication interfaces called S1 interfaces, respectively.
Note that the femto BS 1c (CSG femto BS or Open femto BS) may be connected to the MME 3 via the S1 interface without passing through the HeNB gateway (GW) 5.

The network based on the S1 interface and the X2 interface constitutes an inter-base station network that connects the base station apparatuses 1a, 1b, and 1c with wires. In this inter-base station network, a server (not shown) for managing communication is installed.
In addition, between each base station apparatus 1a, 1b, 1c, the synchronization between base stations is ensured using the network between base stations.

[2. LTE frame structure]
In the FDD scheme that can be adopted in LTE that the communication system according to the present embodiment complies with, an uplink signal (a transmission signal from the terminal device to the base station device) and a downlink signal (a transmission signal from the base station device to the terminal device) By assigning different use frequencies to each other, uplink communication and downlink communication are simultaneously performed.

  FIG. 4 is a diagram illustrating the structure of uplink and downlink radio frames in LTE. The radio frame (DL frame) and the uplink radio frame (UL frame), which are downlink basic frames in LTE, each have a time length of 10 milliseconds, and there are 10 frames from # 0 to # 9. Subframes (communication unit areas having a fixed time length). These DL frames and UL frames are arranged in the time axis direction with their timings aligned.

FIG. 5 is a diagram illustrating a detailed structure of a DL frame (a transmission frame of the base station apparatus). In the figure, the vertical axis direction represents frequency, and the horizontal axis direction represents time.
Each subframe constituting the DL frame is composed of two slots. One slot is composed of seven (# 0 to # 6) OFDM symbols (in the case of Normal Cyclic Prefix).
In the figure, a resource block (RB: Resource Block), which is a basic unit area in data transmission, is defined by 12 subcarriers in the frequency axis direction and 7 OFDM symbols (1 slot) in the time axis direction.
Further, the bandwidth in the frequency direction of the DL frame is specified as a plurality of set values with a maximum of 20 MHz.

  As shown in FIG. 5, a transmission area for the base station apparatus 1 to allocate a control channel necessary for downlink communication to the terminal apparatus 2 is secured at the head of each subframe. This transmission area is assigned with symbols # 0 to # 2 (three symbols at the maximum) of slots located on the head side in each subframe. In this transmission area, PDCCH (Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator. Channel), PHICH (Physical HARQ Indicator Channel), etc. are allocated.

  Of the ten subframes constituting the DL frame, each of the first (# 0) and sixth (# 5) subframes is a control signal for identifying a base station apparatus or a cell. An area (P-SCH: Primary Synchronizaiton Channel, S-SCH: Secondary Synchronizaiton Channel) for transmitting a synchronization signal (PSS: Primary Synchronization Signal) and a second synchronization signal (SSS: Secondary Synchronization Signal) is allocated.

Also, in the DL frame, a first subframe # 0 is assigned a broadcast channel (PBCH: Physical Broadcast Channel) for notifying the terminal device of the system bandwidth and the like by broadcast transmission. PBCH is arranged with four symbol widths at the positions of symbols # 0 to # 3 in the slot on the rear side in first subframe # 0 in the time axis direction, and in the frequency axis direction, the center of the bandwidth of the DL frame Are allocated for 6 resource block widths (72 subcarriers). This channel is configured to be updated every 40 milliseconds by transmitting the same information over four frames.
The PBCH stores a master information block (MIB) including a communication bandwidth, a radio frame number, and the like.

Other resource blocks to which the above-described channels are not allocated are used as DL shared channels (PDSCH) for storing user data and the like. This PDSCH is an area shared by a plurality of terminal devices.
The allocation of user data stored in the PDSCH is notified to the terminal device by resource allocation information regarding downlink radio resource allocation stored in the PDCCH allocated at the head of each subframe. This resource allocation information is information indicating radio resource allocation of each PDSCH, and the terminal apparatus can recognize that data for itself is stored in the subframe by this resource allocation information.
The P-SCH, S-SCH, PBCH, PDCCH and other control channels include various control signals necessary for the terminal device 2 to receive data signals transmitted on the PDSCH. When the channel receives radio wave interference, it interferes with reception of the data signal transmitted by the PDSCH.

  In addition to user data, PDSCH stores control signals common to each terminal device, individual control signals for each terminal device, and the like. Examples of the control signal stored in the PDSCH include broadcast information such as a system information block (SIB).

  System information blocks include SIB1 to SIB9. The timing at which SIB1 is transmitted is specified by MIB. The scheduling information of SIB2 to SIB9 is included in SIB1. Therefore, the notification information such as SIB can be read by the terminal device even if the terminal device 2 has not established a connection with the base station device 1. Note that the number of SIBs is not particularly limited.

[3. About blank subframe]
When each base station apparatus 1 gives interference to other base station apparatuses 1 other than its own apparatus, a blank subframe for suppressing the interference can be set in its own radio frame. .
A blank subframe is a subframe in which there is substantially no data signal in the subframe and a null signal is transmitted. The base station apparatus 1 on the interfering side transmits the base station apparatus 1 on the interfered side. Is set in the radio frame of the base station apparatus 1 on the interference side.

In the present embodiment, ABS (Almost Blank Subframe) is used as a blank subframe (blank section). The ABS is a blank subframe that does not include a data signal (PDSCH) but includes a reference signal (CRS; Cell-speciffic Reference Signal) and / or a minimum required control signal.
A blank subframe is a subframe in which a data signal exists and is used for communication, and the power of the signal in the subframe is suppressed to a small level. It may be considered that it is a blank subframe that is not used automatically.

In addition to ABS, a subframe (MBSFN) for MBMS (Multimedia Broadcast Multicast Service) may be used as a blank subframe (blank section). MBMS is a broadcast service such as a TV broadcast service, and the same information is transmitted from a plurality of base station apparatuses using the same resource at the same timing.
Since MBMS is a broadcast service, in the MBSFN subframe used for MBMS, in addition to the information related to MBMS, the necessary minimum control information such as the fact that the subframe is an MBSFN subframe is sent to the control channel (the head of the subframe). Control information directed to a specific terminal device is not transmitted.

In this embodiment, when MBSFN is used, a null signal is set as a data signal in the MBSFN transmitted by the femto BS 1c in order to make the MBSFN blank. Since MBSFN that transmits a null signal does not need to include a reference signal, it is closer to a more complete blank subframe than ABS.
As described above, the blank subframe (blank section) does not have to have no signal at all, and it is sufficient if a blank of the signal is substantially present.

FIG. 6 is a diagram illustrating an example when an ABS is set in a radio frame of the macro BS 1a when there is a possibility of interference between the macro BS 1a and the pico BS 1b.
The macro BS 1a and the pico BS 1b are both public base station apparatuses. However, since the macro BS 1a has a lower connection priority of the terminal apparatus 2 than the pico BS 1b, there is a possibility that interference may occur between the macro BS 1a and the pico BS 1b. In this case, the macro BS 1a is the base station apparatus on the interference side, and the pico BS 1b is the base station apparatus on the interfered side.
Therefore, as shown in the figure, the macro BS 1a sets an ABS for suppressing interference with the pico BS 1b in a subframe included in the radio frame of the own device 1a.
The macro BS 1a sets a subframe corresponding to the subframe (section) in which the pico BS 1b transmits a control signal as an ABS.
As described above, since there is substantially no data signal in the ABS, the terminal device 2 connected to the pico BS 1b receives a control signal (P-SCH, S-SCH, PBCH, etc.) transmitted by the pico BS 1b. In addition, it is possible to suppress radio wave interference from the macro BS 1a.

  As described above, each base station apparatus 1 of the present embodiment uses, as a radio frame of its own apparatus 1, a blank section that can suppress the interference with respect to other base station apparatuses 1 that may cause interference. It has a function to set.

[4. About ABS information]
Since the base station apparatus on the interfered side uses the ABS (subframe of the timing corresponding to) set in the radio frame of the base station apparatus on the interfered side, the base station apparatus on the interfered side It is necessary to recognize in advance the ABS schedule set by the base station apparatus on the side. Therefore, before setting the ABS, the interfering base station apparatus determines the ABS setting position (schedule) to be set in the radio frame of the own apparatus, and includes an ABS including information on the determined ABS setting position. Information is transmitted to the base station apparatus on the interfered side.

  FIG. 7 is a diagram illustrating an aspect of transmission / reception of information related to ABS information performed by the base station apparatus. In FIG. 7, the macro BS 1a (MBS) that is the base station apparatus on the interfering side sets the ABS schedule, and information on the ABS with the pico BS 1b (PBS) that is the base station apparatus on the interfered side This shows a case where transmission / reception is performed.

As shown in the figure, when the macro BS 1a determines to set the ABS, the macro BS 1a transmits ABS information (ABS Information) to the pico BS 1b, which is the base station apparatus on the interfered side, via the inter-base station network ( Step S1).
The ABS information includes ABS pattern information (ABS pattern Info) that indicates the ABS setting position that the macro BS 1a intends to set in its own radio frame in a pattern. The macro BS 1a can cause the pico BS 1b to recognize the set position of the ABS by transmitting ABS information including the ABS pattern information to the pico BS 1b.

The pico BS 1b determines whether the setting position of the ABS to be set by the macro BS 1a is appropriate (step S2). More specifically, the pico BS 1b determines whether the set position of the ABS can be used for inter-cell interference protection. The pico BS 1b transmits ABS current status information (ABS Status) including usable ABS pattern information (Usable ABS Pattern Info), which is the determination result, to the macro BS 1a via the inter-base station network (step S3).
The usable ABS pattern information is information indicating whether or not the ABS that the macro BS 1a is to set is usable for interference protection between cells. Accordingly, when it is determined that the set ABS setting position is unusable, the macro BS 1a that has received this resets the ABS setting position again, and retransmits the ABS pattern information indicating the reset ABS pattern ( Step S4).

The macro BS 1a resets the ABS setting position (ABS pattern) until it is determined that the set ABS setting position is usable, and repeats transmission of the ABS information.
The macro BS 1a, which is the base station apparatus on the interfering side, and the pico BS 1b, which is the base station apparatus on the interfered side, repeatedly determine the ABS pattern that can be used by repeating transmission and reception of the ABS information and the ABS current information. To do.

[5. Configuration of base station apparatus]
FIG. 8 is a block diagram showing a configuration of the macro BS 1a of the present embodiment. The macro BS 1a includes an antenna 11 used for transmission / reception of signal waves, a communication processing unit 10 to which the antenna 11 is connected, and a signal processing unit 20 that performs processing of signals transmitted and received by the communication processing unit 10. Yes.

The communication processing unit 10 includes a transmission / reception unit 12 that performs wireless communication with the terminal device 2, and an inter-base station communication unit 13 that performs inter-base station communication with another base station device 1. Yes.
The signal processing unit 20 functions as an ABS setting unit 21 that performs processing for setting an ABS in a radio frame of the device itself, and an ABS pattern setting unit 22 that sets an ABS setting position (ABS pattern) before setting the ABS. Have.
Based on the ABS pattern set by the ABS pattern setting unit 22, the ABS setting unit 21 sets the ABS in the radio frame of the own device.
As shown in FIG. 7, the ABS pattern setting unit 22 transmits the ABS information to another base station apparatus and obtains usable ABS pattern information included in the ABS current status information transmitted from the other base station apparatus. By doing so, it has a function of setting an ABS pattern and performing a process necessary to finally determine an available ABS pattern.
Also, the ABS pattern setting unit 22 acquires the ABS pattern information included in the ABS information transmitted from another base station apparatus, and whether or not the other base station apparatus can use the ABS pattern for which the ABS is to be set. It also has a function of performing the process of determining

  Although FIG. 8 shows the configuration of the macro BS 1a, other base station devices such as the pico BS 1b and the femto BS 1c are basically configured in the same manner.

[6. About ABS pattern setting]
Next, setting of the ABS pattern performed by the ABS setting unit 21 will be described.
As described above, the ABS pattern indicating the setting position in the ABS radio frame is obtained by repeatedly transmitting and receiving the ABS information and the ABS current information between the base station apparatus on the interference side and the base station apparatus on the interfered side. Finally decided.

FIG. 9 is a diagram illustrating an example of a relationship between an interfering base station apparatus and an interfered base station apparatus. FIG. 9 illustrates a state in which a plurality of base station apparatuses may interfere with the pico BS 1b. In this case, two macro BSs 1a (1a1 and 1a2) and one CSG_femto BS1c, which are a plurality of base station apparatuses, are interfering base station apparatuses that use the pico BS 1b as an interfered base station apparatus.
In the following description, as shown in FIG. 9, a macro BS 1a as an interfering base station apparatus that interferes with a pico BS 1b as an interfered base station apparatus sets an ABS pattern. Processing performed by each of the BS 1a and the pico BS 1b will be described.

When the macro BS 1a (the ABS pattern setting unit 22) sets the ABS pattern, the macro BS 1a sets the ABS pattern in accordance with the setting order when it is added to the ABS pattern as the ABS setting position. First, the macro BS 1a sets an ABS pattern in which the ABS setting position is provided only in the first subframe in the setting order, and transmits ABS information including the information to the pico BS 1b.
Here, the setting order is an order for setting the ABS pattern, and is assigned to each subframe included in the radio frame. The setting order will be described later in detail.

The pico BS 1b (the ABS pattern setting unit 22) that has received the ABS information determines whether or not it can be used to set the ABS in the first subframe in the setting order indicated by the ABS pattern included therein.
If it is determined in the pico BS 1b that setting an ABS in the first subframe in the setting order is unusable and the macro BS 1a receives the ABS current state information to that effect, the macro BS 1a The ABS pattern in which the content for providing the ABS setting position is added to the second subframe in the setting order is set while the content for providing the ABS setting position is added to the sub-frame.

  If it is determined that the pico BS 1b cannot use the ABS pattern in which the ABS setting position is provided in the first and second subframes in the setting order, the macro BS 1a determines that the ABS is set in the first and second subframes in the setting order 1. The ABS pattern in which the content for providing the ABS setting position is added to the third subframe in the setting order is set with the content for providing the setting position as it is.

That is, the ABS pattern setting unit 22 of the macro BS 1a determines that the ABS current state information as the ABS pattern determination result by the pico BS 1b (interfered base station apparatus) is unusable, and includes the subframe included in the radio frame. An ABS setting position is further set for the next subframe determined based on the setting order assigned to each.
Further, the ABS setting position is further set for the next subframe determined by the setting order among the subframes not yet set as the ABS setting position, with the ABS setting position already set as it is. .
In this way, the macro BS 1a performs setting of the ABS pattern until the ABS pattern permitted to be used for any of the subframes is set.

  FIG. 10 is a diagram for explaining a mode in which the macro BS 1a sets the ABS pattern as described above. FIG. 10 (a) shows subframes in the radio frame of the macro BS1a, and is shown in each subframe. The numbers indicate the setting order of the subframes when the ABS pattern is added to the ABS pattern as the ABS setting position. Also, (b) corresponds to (a), and an example of a determination result when the pico BS 1b determines whether or not each subframe in the radio frame can be used as an ABS by another base station apparatus. Show. (C) shows the aspect of the setting of the ABS pattern stepwise when it is set as shown in FIGS. 10 (a) and 10 (b).

When the macro BS 1a is set as shown in FIGS. 10A and 10B, the macro BS 1a is the first in the setting order according to the setting order as shown in the upper part of FIG. An ABS pattern is set so as to provide an ABS setting position in the second subframe # 8.
However, since this subframe # 8 is determined to be unusable in the pico BS 1b as shown in FIG. 10B, the macro BS 1a receives the ABS current state information to that effect. The macro BS 1a that has received this information sets the ABS setting position in the fourth subframe # 4 from the left of the page, which is the second setting order, in addition to the subframe # 8, as shown in the middle part of FIG. An ABS pattern of contents to be provided is set.

Even in this case, the subframe # 4 cannot be used in the pico BS 1b, and the macro BS 1a receives the ABS current state information indicating that the subframes # 4 and # 8 are determined to be unusable.
For this reason, as shown in the lower part of FIG. 10C, the macro BS 1a further sets the ABS setting position in the third subframe # 6 in the seventh setting order from the left of the page in addition to the subframes # 4 and # 8. Set the ABS pattern as the content to be provided.

In this case, as shown in FIG. 10B, since it is determined that the subframe # 6 is usable in the pico BS 1b, the macro BS 1a receives the ABS current state information to that effect. This ABS current status information indicates that the subframes # 4 and # 8 cannot be used, and the subframe # 6 can be used. Therefore, the macro BS 1a that has received this information uses the subframe # 6. Recognize that it is possible. The ABS pattern setting unit 22 of the macro BS 1a that has recognized that the subframe # 6 can be used determines the ABS pattern shown in the lower part of FIG. 10C as the ABS pattern to be set in the radio frame of the own apparatus.
When the ABS pattern setting unit 22 determines the ABS pattern, the ABS setting unit 21 sets the ABS in the radio frame of the own apparatus based on the ABS pattern.

[7. About setting order for setting ABS pattern]
In the present embodiment, as shown in FIG. 9, two macro BSs 1a and CSG_femto BS 1c each interfere with the same pico BS 1b.
That is, the BS 1a1, 1a2, and 1c, which are interfering base station apparatuses, have the same interfered base station apparatus. In this case, naturally, in each BS 1a1, 1a2, and 1c, the priority of connection by the terminal device to the interfered base station device in each BS is also the same.
In this case, the BSs 1a1, 1a2, and 1c that are interfering base station apparatuses set the same ABS pattern setting order for the pico BS 1b that is the interfered base station apparatus.
In this way, each BS as an interfering base station apparatus has the same ABS pattern setting order for the interfered base station apparatus having the same priority if the priorities of the interfered base station apparatuses are the same. Set to.
That is, in the present embodiment, among the BSs, the base station apparatuses having the same priority in the interfered base station apparatus have the same setting order as the ABS pattern setting order for the interfered base station apparatus. Is configured to use.

In the present embodiment, each BS 1a1, 1a2, and 1c has shown the case where the same pico BS 1b is used as the base station apparatus on the interfered side. Even when interference is given to the above, the same setting as described above is made.
In this case, the CSG_femto BS1c and BS1a1 (BS1a2) interfere with different base station apparatuses and are not the same as the interfered base station apparatus, but the priority of each BS in the interfered base station apparatus is Are identical to each other. Therefore, the same setting as described above is made.

  Each BS 1a1, 1a2, 1c has a function of setting the setting order, and also has a function of setting based on information from other base station apparatuses. The BSs 1a1, 1a2, and 1c exchange information with each other using inter-base station communication using the X2 interface, share the setting order, and set the same setting order.

Each BS 1a1, 1a2, 1c stores a plurality of preset order patterns as shown in FIG. 11 and selects one of the preset order patterns. Then, the information specifying the selected pattern can be shared by each BS 1a1, 1a2, 1c via inter-base station communication or the like.
In this case, for example, every time an attempt is made to set the same setting order among a plurality of base station apparatuses, compared with the case where the order is assigned to 10 subframes included in a radio frame, the setting and its Easy to change.

[8. About effect]
According to the above configuration, when the macro BS 1a indicates that the ABS current state information, which is the determination result by the pico BS 1b for the set ABS pattern (ABS setting position), indicates that no subframe is usable, Since the ABS setting position is set for the next subframe determined based on the setting order, until a setting position that can receive a determination result indicating that it can be used (that the setting position is suitable) is set. By repeating the setting of the ABS pattern (ABS setting position), it is possible to set the ABS setting position for determining that the interfered base station apparatus is suitable. For this reason, if the setting position of the blank section is set according to the setting order, the ABS pattern is always set in the same pattern.

In this regard, in the present embodiment, as shown in FIG. 9, the connection priorities of the terminal devices 2 are the same as each other, such as the macro BS 1a that interferes with the pico BS 1b or the CSG_femto BS 1c. When there are a plurality of base station apparatuses that interfere with the base station apparatus (pico BS 1b), these base station apparatuses set the same ABS pattern with respect to the setting order of the ABS pattern for the interfered base station apparatus. Configured to use order.
For this reason, since the priorities of the base station apparatuses on the interfered side are the same, it is possible to match the ABS patterns between the base station apparatuses having a common interference relationship with each other. As a result, it is possible to suitably set the ABS pattern by each of the plurality of base station apparatuses.

  Further, in the present embodiment, the macro BS 1a keeps the set position of the ABS that has been set as it is, and among the subframes that are not yet set as the set position of the ABS, for the next subframe determined by the setting order. Further, since the ABS setting position is set, the next setting position can be added without changing the already set setting position, and the setting becomes easy.

[9. Other examples of ABS pattern setting]
FIG. 12 is a diagram illustrating an example of the relationship between the base station apparatus on the interfering side and the base station apparatus on the interfered side, and illustrates another example different from FIG. FIG. 12 shows a state in which the macro BS 1a may cause interference to the pico BS 1b and the CSG_femto BS 1c may cause interference to the macro BS 1a. Note that the CSG_femto BS1c has no possibility of interference with the pico BS1b.
In this case, the CSG_femto BS 1c is an interfering base station device that uses the macro BS 1a as the interfered base station device, and the macro BS 1a is the interfering device that uses the pico BS 1b as the interfered base station device. It is a base station device. That is, in FIG. 12, the macro BS 1 a is both a base station apparatus on the interference side and a base station apparatus on the interfered side.

  Hereinafter, processing performed by each of the CSG_femto BS 1c, the macro BS 1a, and the pico BS 1b when the CSG_femto BS 1c and the macro BS 1a set the ABS pattern shown in FIG. 12 will be described.

  FIG. 13 shows subframes in a radio frame, and (a) shows the subframes to be added to the ABS pattern as the ABS setting position for the pico BS1b when the ABS pattern is set in the macro BS1a. The setting order is shown. (B) shows the setting order for the ABS pattern for the pico BS 1b and the setting order for the ABS pattern for the macro BS 1a when setting the ABS pattern in the CSG_femto BS 1c.

  As shown in FIG. 13A, the ABS pattern setting order for the pico BS 1b in the macro BS 1a is set to 1 to 10 in order from the first subframe # 0. Therefore, also in the CSG_femto BS 1c, when an ABS pattern is set for the pico BS 1b as in the macro BS 1a, the ABS pattern setting order is as shown in the upper part of FIG. 13B with respect to the pico BS 1b in the macro BS 1a. The setting is the same as the ABS pattern setting order. In this case, both the pico BS 1b is the base station apparatus on the interfered side, and the macro BS 1a and the CSG_femto BS 1c are the base station apparatuses (pico BS 1b) having the same connection priority of the terminal apparatus 2. This is because it corresponds to a plurality of base station apparatuses giving interference. As described above, these base station apparatuses are configured to use the same setting order as the ABS pattern setting order for the interfered base station apparatus.

On the other hand, in the CSG_femto BS 1c, the ABS pattern setting order for the macro BS 1a is set to be different from the setting order for the pico BS 1b, as shown in the lower part of FIG.
That is, in CSG_femto BS1c, macro BS1a and pico BS1b exist as targets that can be interfered base station apparatuses. The macro BS 1a and the pico BS 1b have different connection priorities between the terminal devices 2, respectively.
For this reason, the CSG_femto BS 1c uses different setting orders when setting the ABS pattern for each of the macro BS 1a and the pico BS 1b as the interfered base station apparatus.
In the present embodiment, since the CSG_femto BS 1c does not possibly interfere with the pico BS 1b, the ABS pattern setting order in the upper part of FIG. 13B is not used in the example of FIG.

  FIG. 14A shows an example of a determination result when the pico BS 1b determines whether or not each subframe in the radio frame can be used as an ABS by another base station apparatus, and in this case, the macro BS 1a It is a figure which shows the aspect of the setting of the ABS pattern with respect to pico BS1b.

As shown in FIG. 13 (a), the ABS pattern setting order for the pico BS 1b in the macro BS 1a is set to 1, 2,... In order from the first subframe # 0. Therefore, the macro BS 1a sequentially adds the first subframe # 0, the second subframe # 1, and the third subframe # 2 to the ABS pattern as ABS setting positions.
When the third subframe # 2 is added to the ABS pattern as the ABS setting position, the pico BS 1b determines that the ABS setting position can be used, so the macro BS 1a uses the ABS pattern shown in FIG. It is determined as an ABS pattern to be set in the radio frame of its own device.

  FIG. 14B shows an example of a determination result when the macro BS 1a determines whether or not each subframe in the radio frame can be used as an ABS by another base station apparatus, and in this case, the CSG_femto BS1c It is a figure which shows the aspect of the setting of the ABS pattern with respect to macro BS1a by.

As shown in the lower part of FIG. 13B, the ABS pattern setting order for the macro BS 1a in the CSG_femto BS 1c is the ninth subframe # 8, the fourth subframe # 3, and the seventh subframe # 6. .. Are set in the order of. Therefore, the CSG_femto BS 1c sequentially adds the ninth subframe # 8, the fourth subframe # 3, and the seventh subframe # 6 to the ABS pattern as the ABS setting position.
When the seventh subframe # 6 is added to the ABS pattern as the ABS setting position, the macro BS 1a determines that the ABS setting position can be used, so the CSG_femto BS 1c uses the ABS pattern shown in FIG. Then, it is determined as an ABS pattern to be set in the radio frame of the own device.

  At this time, since the setting order of the ABS pattern for the macro BS 1a in the CSG_femto BS1c and the setting order of the ABS pattern for the pico BS 1b in the macro BS 1a are set differently, as shown in FIG. The ABS pattern for the macro BS 1a in the BS 1c and the ABS pattern for the pico BS 1b in the macro BS 1a are set differently.

  In the base station apparatuses having different priorities of the interfered base station apparatuses, the priorities may be different between the base station apparatuses. In this case, if the same ABS pattern with the same ABS position is set between the base station apparatuses, one base station apparatus with a lower priority is assigned to the other base station apparatus with a higher priority. The ABS is set in the ABS set for the interference base station apparatus. Then, in the one base station apparatus, there is a possibility that the ABS set by itself is not effectively used by the other base station apparatus.

For example, it is assumed that the ABS pattern setting order for the macro BS 1a in the CSG_femto BS 1c is set to be the same as the ABS pattern setting order for the pico BS 1b in the macro BS 1a. At this time, as shown in the lower part of FIG. 14B, the CSG_femto BS 1c first sets an ABS pattern in which an ABS is provided in the first subframe # 0.
However, even if the CSG_femto BS 1c provides the ABS setting position in the first subframe # 0 as the ABS pattern for the macro BS 1a, the macro BS 1a does not change the first subframe # 1 as shown in FIG. Since the ABS setting position is provided at 0, the first subframe # 0 is not actively used. Therefore, even if the CSG_femto BS 1c is not used effectively even if an ABS setting position is provided in the first subframe # 0, an ABS pattern in which subframes in the next setting order are added as setting positions is set. .
Since the subframe of the next setting order is also the same as the macro BS 1a, repeating the setting of the ABS pattern in accordance with the setting order results in addition to the same subframe as the subframe set by the macro BS 1a as the ABS setting position, Further, since the subframe in the next setting order is also set as the setting position, an ABS pattern having one more setting position than the ABS pattern of the macro BS 1a is set. In this way, the CSG_Femto BS 1c may set many ABSs that are not effectively used by the macro BS 1a.

  In this regard, in the present embodiment, when the CSG_femto BS 1c sets an ABS pattern for each of the macro BS 1a and the pico BS 1b as a plurality of interfered base station devices having different connection priorities of the terminal devices, Since different setting orders are used, it is possible to set different ABS patterns respectively for a plurality of interfered base station apparatuses having different priorities. As a result, it is possible to prevent setting an ABS that cannot be used effectively.

The present invention is not limited to the above embodiments. In the above embodiment, the aspect when the base station apparatus sets the ABS pattern has been described. However, even when the position of the ABS provided in the radio frame in the ABS pattern is canceled, the above-described ABS pattern setting order is used. Do it.
When releasing the ABS position set in the ABS pattern, the ABS position is sequentially released in the reverse order to the setting order at the time of setting. As a result, the ABS can be released without affecting others.

  Further, in the above embodiment, when the ABS pattern setting order is shared among a plurality of base station apparatuses 1 via the inter-base station communication using the X2 interface or the like, the setting order is shared. However, OAM (Operation Administration and Maintenance) can also be used as means for exchanging information between the plurality of base station apparatuses 1.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Base station apparatus (1a: Macro base station apparatus, 1b: Pico base station apparatus, 1c: Femto base station apparatus)
2 Terminal device 10 Communication processing unit 12 Transmission / reception unit 13 Inter-base station communication unit 22 ABS pattern setting unit

Claims (7)

A communication system comprising a plurality of base station devices that communicate using radio frames partitioned by a plurality of unit sections,
The base station device
A setting unit that sets the setting position in the radio frame of the blank section to be set for the interfered base station apparatus to which the own apparatus gives interference;
An acquisition unit that acquires a determination result regarding the suitability of the set position by the interfered base station device, and
When the determination result is negative, the setting unit sets a next unit interval determined based on a setting order for setting the setting position assigned to each of the plurality of unit intervals included in the radio frame. The setting position is set for
Among the base station apparatuses, the base station apparatuses having the same priority of connection by the terminal apparatus to the interfered base station apparatus in the interfered base station apparatus have the same setting position with respect to the interfered base station apparatus. A communication system using the same setting order as the setting order for setting.   When the determination result is negative, the setting unit leaves the set position of the blank section that has been set as it is, the unit section that has not yet been set as the set position, and is determined by the setting order. The communication system according to claim 1, wherein a setting position of the blank section is further set for a unit section. The setting unit
When a plurality of base station apparatuses having different connection priorities by terminal apparatuses are used as the interfered base station apparatuses, the setting orders for setting the setting positions for the interfered base station apparatuses are different from each other. The communication system according to claim 1 or 2, wherein:   The communication system according to any one of claims 1 to 3, wherein when the setting position is canceled, the setting position is sequentially canceled in an order reverse to a setting order when the setting position is set. A base station apparatus that communicates using a radio frame partitioned by a plurality of unit sections,
A setting unit that sets the setting position in the radio frame of the blank section to be set for the interfered base station apparatus to which the own apparatus gives interference;
An acquisition unit that acquires a determination result regarding the suitability of the set position by the interfered base station device, and
When the determination result is negative, the setting unit sets a next unit interval determined based on a setting order for setting the setting position assigned to each of the plurality of unit intervals included in the radio frame. In addition to setting the setting position,
Among other base station devices other than the own device, between other base station devices having the same priority of connection by the terminal device to the interfered base station device in the interfered base station device. A base station apparatus using the same setting order as the setting order for setting the setting position for the interfered base station apparatus. A base station apparatus that communicates using a radio frame partitioned by a plurality of unit sections,
A setting unit that sets the setting position in the radio frame of the blank section to be set for the interfered base station apparatus to which the own apparatus gives interference;
An acquisition unit that acquires a determination result regarding the suitability of the set position by the interfered base station device, and
When the determination result is negative, the setting unit sets a next unit interval determined based on a setting order for setting the setting position assigned to each of the plurality of unit intervals included in the radio frame. In addition to setting the setting position,
When a plurality of base station devices having different connection priorities of terminal devices are used as interfered base station devices,
A base station apparatus characterized in that different setting orders are used for the setting order for setting the setting position for each of the interfered base station apparatuses. A base station apparatus that communicates using a radio frame partitioned by a plurality of unit sections is a method of setting a setting position in the radio frame of a blank section that is set for an interfered base station apparatus that gives interference,
A setting order setting step for setting a setting order for setting the setting position assigned to each of the plurality of unit sections included in the radio frame;
A setting step for setting a position of a blank section for each unit section;
An acquisition step of acquiring a determination result relating to suitability of the set position by the interfered base station device;
Repetitively executing the setting step and the receiving step,
In the setting step, when the determination result is negative, the setting position is set for a next unit section determined based on the setting order,
In the setting order setting step, among a plurality of other base station devices other than the own device, base stations having the same priority of connection by the terminal device to the interfered base station device in the interfered base station device A blank interval setting method, wherein a setting order for setting the setting position for the base station apparatus to be interfered with is set to the same order setting.

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