JP2011077964A - Communication system, interference adjusting method, base station apparatus and mobile station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system, base station apparatus and mobile station device, capable of efficiently adjusting interference to a home base station apparatus in the communication system including the mobile station device, the base station apparatus managing a macro cell and the home base station apparatus managing a home cell. <P>SOLUTION: The base station apparatus managing a macro cell determines whether it is necessary to specify a base station apparatus managing a home cell in the vicinity of a mobile station device for interference adjustment and if it is determined that the base station apparatus has to be specified, transmission of additional information required for specifying the base station apparatus managing the home cell is requested to the mobile station device. The mobile station device acquires the additional information based on the request of the base station apparatus managing the macro cell and transmits at least the additional information to the base station apparatus managing the macro cell, the base station apparatus managing the macro cell generates a control message relating to the interference adjustment based on the additional information and transmits the control message to the base station apparatus managing the home cell. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication system including a mobile station apparatus, a base station apparatus that manages a macro cell, and a base station apparatus that manages a home cell, a communication system capable of efficiently adjusting interference with a home cell, an interference adjustment method, and The present invention relates to a base station apparatus and a mobile station apparatus that use the communication system.

  Currently, a base station apparatus for a small number of people in a home or office is being studied. A base station device for a small number of people is typically smaller than a normal base station device, and is connected to a core network via a general network line to expand a communication area, improve traffic, or Used to provide user specific services.

  In the 3rd Generation Partnership Project (3GPP), which is a standardization project, high-speed communication has been realized by adopting OFDM (Orthogonal Frequency-Division Multiplexing) method and flexible scheduling of predetermined frequency and time units called resource blocks. Evolved Universal Terrestrial Radio Access (hereinafter referred to as “EUTRA”) has been studied, and further, advanced EUTRA (also referred to as “LTE-Advanced”), which is an advanced version thereof, has been studied.

  A personal-use base station apparatus is called a home base station apparatus, and in particular, a third generation home base station apparatus defined by 3GPP is called a home node B. A home base station apparatus in EUTRA and Advanced EUTRA is referred to as a home eNodeB. The home base station apparatus manages an area (cell) in which the mobile station apparatus can communicate, and the cell is referred to as a home cell. The home cell is also referred to as a femto cell, a pico cell, or a nano cell depending on the size of an area that can communicate with the mobile station apparatus. Further, when the mobile station apparatus can communicate with a certain base station apparatus, the cell of the base station apparatus is a serving cell of the mobile station apparatus, and the cells of the other base station apparatuses are called peripheral cells.

  A plurality of home base station apparatuses can be arranged in an area (macro cell) capable of communicating with a mobile station apparatus managed by the base station apparatus (macro base station apparatus). Therefore, there is a known problem that interference occurs with the home base station device when the mobile station device communicates with the base station device (Non-Patent Document 1).

  As a typical example of interference received by the home base station apparatus, an uplink transmission signal transmitted from a mobile station apparatus (macro mobile station apparatus) communicating with the base station apparatus communicates with the home base station apparatus ( There is interference on the uplink transmission signal of the home mobile station device. A method for adjusting interference by exchanging interference information between base station devices called inter cell interference coordination (ICIC) as a function for reducing interference of uplink transmission signals of mobile station devices Is adopted in 3GPP (Non-Patent Document 2, section 8.3.1).

Vodafone, AT & T, Alcatel Lucent, picoChip Designs, Qualcomm Europe, R4-099766, 3GPP TSG-RAN WG4 # 51, San Francisco, 4-8 May 2009 3GPP TS 36.423, X2 application protocol (X2AP) V 8.6.0 http: // www. 3 gpp. org / ftp / Specs / html-info / 36423. htm

  FIG. 10 is a diagram for explaining the problem to be solved by the present invention, in which the mobile station apparatus communicating with the base station apparatus A is in a state of giving interference to the uplink of the home base station apparatus A. It shows that. That is, the uplink transmission signal for the base station apparatus A from the mobile station apparatus located in the vicinity of the home base station apparatus A gives strong interference to the uplink of the home base station apparatus A. In this case, the base station apparatus A attempts interference adjustment so as to reduce interference to the mobile station apparatus A based on the interference information from the home base station apparatus A.

  At this time, when another home base station apparatus B having the same cell identifier (PCI; Physical Cell Identifier) as the home base station apparatus A exists in the macro cell, the base station apparatus A becomes an object of interference adjustment. Since the home base station device cannot be specified, there is a possibility that control is performed on the mobile station device B located in the vicinity of the home base station device B that does not require interference adjustment. Thus, when there are a plurality of home base station apparatuses having the same cell identifier in the macro cell, there arises a problem that the base station apparatus A cannot perform appropriate interference adjustment.

  Similarly, since the base station apparatus A cannot identify the mobile station apparatus A located in the vicinity of the home base station apparatus A, the occurrence of interference due to the presence of the mobile station apparatus A in the vicinity of the home base station apparatus A There is a problem that the home base station apparatus A cannot be notified.

  Due to these problems, the conventional interference adjustment method cannot be used for the home base station apparatus, which causes the quality degradation of the uplink transmission signal and the throughput reduction.

  In view of the above problems, the present invention provides a communication system, an interference adjustment method, a mobile station apparatus, and a base station apparatus capable of efficiently adjusting interference of an uplink transmission signal with respect to a home base station apparatus. With the goal.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the communication system of the present invention includes a mobile station device, a first base station device that manages a macro cell, and a second base station device that manages a home cell, and performs uplink interference adjustment in the first base station device. A communication system performed between a base station apparatus and the second base station apparatus, wherein the first base station apparatus is located near the mobile station apparatus for interference adjustment. Requesting the mobile station apparatus to transmit additional information necessary for specifying the second base station apparatus when it is determined that it is necessary to specify, The mobile station apparatus acquires the additional information based on a request from the first base station apparatus, transmits at least the additional information to the first base station apparatus, and the first base station apparatus Control message for interference adjustment based on additional information It generates di-, and transmits the control message to the second base station apparatus.

  (2) Further, in the communication system of the present invention, the first base station apparatus includes the second base station apparatus having the same cell identifier in a macro cell managed by the first base station apparatus. In this case, it is determined that it is necessary to request the mobile station apparatus to transmit additional information necessary for specifying the second base station apparatus.

  (3) Moreover, in the communication system of the present invention, the first base station device is configured so that when the mobile station device that interferes with the second base station device cannot be specified, the second base station device It is determined that it is necessary to request transmission of additional information necessary for specifying the second base station device to one or more mobile station devices located in the vicinity.

  (4) Further, in the communication system of the present invention, the first base station device is configured such that when the second base station device is in communication, the second base station is connected to the mobile station device. It is characterized in that it is determined that it is necessary to request transmission of additional information necessary for specifying the device.

  (5) In the communication system of the present invention, the additional information is one or both of a cell global identifier and a tracking area identifier included in the broadcast information of the second base station device. .

  (6) In the communication system of the present invention, when the mobile station apparatus is requested by the first base station apparatus to transmit the additional information necessary for identifying the second base station apparatus, In order to acquire the additional information, the gap information is autonomously generated to acquire the additional information.

  (7) Further, in the communication system of the present invention, the additional information is a cell identifier of a neighboring cell of the second base station apparatus having a certain reception quality or higher.

  (8) The base station apparatus of the present invention includes a mobile station apparatus, a first base station apparatus that manages a macro cell, and a second base station apparatus that manages a home cell, and performs uplink interference adjustment. A base station apparatus applied to a communication system performed between the first base station apparatus and the second base station apparatus, wherein the first base station apparatus performs the interference adjustment for the mobile station apparatus. It is determined whether or not it is necessary to specify the second base station device in the vicinity of the mobile station device, and when it is determined that it is necessary to specify, the second base station device is specified for the mobile station device Requesting transmission of additional information necessary for the mobile station apparatus, receiving the additional information acquired and transmitted by the mobile station apparatus, generating a control message relating to interference adjustment based on the additional information, and sending the control message to the second Transmitting to base station equipment That.

  (9) In the base station apparatus of the present invention, the first base station apparatus is such that the second base station apparatus having the same cell identifier exists in a macro cell managed by the first base station apparatus. In this case, it is determined that it is necessary to request the mobile station apparatus to transmit additional information necessary for specifying the second base station apparatus.

  (10) Further, in the base station apparatus of the present invention, the first base station apparatus can determine the second base station apparatus when the mobile station apparatus that interferes with the second base station apparatus cannot be specified. It is determined that it is necessary to request transmission of additional information necessary for specifying the second base station device to one or more mobile station devices located in the vicinity of the base station.

  (11) Further, in the base station apparatus of the present invention, the first base station apparatus is configured such that when the second base station apparatus is in a communication state, the second base station apparatus It is characterized in that it is determined that it is necessary to request transmission of additional information necessary for specifying the station device.

  (12) The mobile station apparatus of the present invention includes a mobile station apparatus, a first base station apparatus that manages a macro cell, and a second base station apparatus that manages a home cell, and performs uplink interference adjustment. A mobile station apparatus applied to a communication system performed between the first base station apparatus and the second base station apparatus, wherein the mobile station apparatus is necessary for specifying the second base station apparatus It is determined whether or not to transmit additional information to the first base station apparatus, and when it is determined to transmit the additional information, the additional information is acquired, and at least the additional information is transmitted to the first base station apparatus. It is characterized by transmitting.

  (13) In addition, the mobile station device of the present invention, when the additional information necessary for specifying the second base station device is requested from the first base station device, the additional information Is determined to be necessary.

  (14) Further, the mobile station apparatus of the present invention provides additional information for starting acquisition of the additional information necessary for specifying the second base station apparatus notified in advance from the first base station apparatus. When the reception condition is satisfied, it is determined that the additional information needs to be transmitted.

  (15) Further, in the mobile station apparatus of the present invention, the additional information reception is one of a plurality of cell identifiers and a threshold value indicating start of reception of additional information, or both.

  (16) Further, the interference adjustment method of the present invention includes a mobile station device, a first base station device that manages a macro cell, and a second base station device that manages a home cell, and the first base station An uplink interference adjustment method applied between a device and the second base station device, wherein the second base station device is located near the mobile station device for interference adjustment in the first base station device. Determining whether it is necessary to specify a base station apparatus, and additional information necessary for specifying the second base station apparatus for the mobile station apparatus when it is determined that it is necessary to specify Requesting the transmission of the additional information based on a request from the first base station device, and transmitting at least the additional information to the first base station device. Including the steps of: In serial first base station apparatus, characterized by comprising the steps of: generating a control message related to interference coordination based on the additional information, and transmitting the control message to the second base station apparatus.

  (17) Further, in the interference adjustment method of the present invention, the first base station apparatus has the second base station apparatus having the same cell identifier in a macro cell managed by the first base station apparatus. In this case, it is determined that it is necessary to request the mobile station apparatus to transmit additional information necessary for specifying the second base station apparatus.

  (18) Further, the interference adjustment method of the present invention is configured so that the first base station apparatus can identify the second base station apparatus when the mobile station apparatus that interferes with the second base station apparatus cannot be specified. It is determined that it is necessary to request transmission of additional information necessary for specifying the second base station device to one or more mobile station devices located in the vicinity of the base station.

  (19) In addition, the interference adjustment method of the present invention provides the second base station device with respect to the mobile station device when the second base station device is in a communication state in the first base station device. It is characterized in that it is determined that it is necessary to request transmission of additional information necessary for specifying the station device.

  (20) Further, in the interference adjustment method of the present invention, the additional information is one or both of a cell global identifier and a tracking area identifier included in broadcast information of the second base station device. To do.

  (21) In the interference adjustment method of the present invention, when the mobile station apparatus is requested by the first base station apparatus to transmit the additional information necessary for specifying the second base station apparatus. In order to acquire the additional information, the gap information is autonomously generated to acquire the additional information.

  (22) Further, in the interference adjustment method of the present invention, the additional information is a cell identifier of a neighboring cell of the second base station apparatus having a certain reception quality or higher.

  As described above, according to the present invention, a communication system, an interference adjustment method, a mobile station apparatus, and a base station apparatus capable of efficiently adjusting interference of an uplink transmission signal with respect to a home base station apparatus are provided. I can do it.

It is the figure which showed an example of the communication system which concerns on embodiment of this invention. It is the block diagram which showed an example of the mobile station apparatus which concerns on embodiment of this invention. It is the block diagram which showed an example of the base station apparatus which concerns on embodiment of this invention. It is an example of the sequence chart which showed the method of interference adjustment which concerns on the 1st Embodiment of this invention. It is an example of the flowchart for determining whether the base station apparatus which concerns on the 1st Embodiment of this invention requests | requires additional information. It is an example of the sequence chart which showed the method of the interference adjustment which concerns on the 2nd Embodiment of this invention. It is an example of the flowchart for determining whether the base station apparatus which concerns on the 2nd Embodiment of this invention requests | requires additional information. It is an example of the sequence chart which showed the acquisition method of the additional information which concerns on the 3rd Embodiment of this invention. It is an example of the flowchart for determining whether the mobile station apparatus which concerns on the 3rd Embodiment of this invention acquires additional information. It is the figure shown about an example in case uplink interference generate | occur | produces with respect to a home base station apparatus.

Before describing embodiments of the present invention, a physical channel and interference adjustment method according to the present invention will be briefly described.
(1) Physical Channel A physical channel (or physical signal) used in EUTRA and Advanced EUTRA will be described. The physical channel may be added or changed in the future in EUTRA and Advanced EUTRA. However, even if the physical channel is changed, the description of each embodiment of the present invention is not affected.

  Synchronization signals are composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately in the frequency domain. Depending on the combination, 504 cell identifiers (PCI) for identifying the base station apparatus and frame timing for radio synchronization are shown. The mobile station device specifies the cell ID of the synchronization signal received by the cell search.

  A physical broadcast information channel (PBCH; Physical Broadcast Channel) is transmitted for the purpose of notifying control parameters (broadcast information (system information): System information) commonly used by mobile station apparatuses in a cell. Broadcast information that is not notified by the physical broadcast information channel is transmitted by a layer 3 message using the downlink data channel, in which radio resources are notified by the downlink control channel. As broadcast information, a cell global identifier (CGI) indicating an individual cell identifier, a tracking area identifier (TAI) for managing a standby area by paging, and the like are notified.

  The downlink reference signal is a pilot signal transmitted at a predetermined power for each cell. The downlink reference signal is a known signal that is periodically repeated at a frequency / time position based on a predetermined rule. The mobile station apparatus measures the reception quality for each cell by receiving the downlink reference signal. The mobile station apparatus also uses the downlink reference signal as a reference signal for demodulation of the downlink control channel or downlink data channel transmitted simultaneously with the downlink reference signal. As a sequence used for the downlink reference signal, a sequence that can be identified for each cell is used. In addition, although a downlink reference signal may be described as cell-specific RS (Cell-specific reference signals), the use and meaning are the same.

  A downlink control channel (PDCCH; Physical Downlink Control Channel) is transmitted in several OFDM symbols from the beginning of each subframe. Radio resource allocation information according to the scheduling of the base station device and transmission to the mobile station device Used to indicate the amount of power increase / decrease adjustment. The mobile station apparatus receives a downlink control channel before transmitting / receiving a layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and when transmitting, the uplink grant, when receiving, the downlink grant It is necessary to acquire radio resource allocation information called

  A downlink data channel (PDSCH: Physical Downlink Shared Channel) is used to notify paging and broadcast information as a layer 3 message that is downlink control data in addition to downlink data. The radio resource allocation information of the downlink data channel is indicated by the downlink control channel.

  An uplink data channel (PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. Similarly to the downlink, the radio resource allocation information of the uplink data channel is indicated by the downlink control channel.

  A random access channel (PRACH) is a channel used for notifying a preamble sequence and has a guard time. The random access channel is used as an access procedure to the base station apparatus by an asynchronous mobile station apparatus whose uplink transmission timing is not synchronized with the base station apparatus, and is used for adjusting a radio resource request and uplink transmission timing. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

(2) Interference adjustment method There are two interference adjustment methods. The first is (a1) dividing the system bandwidth into the frequency bandwidth of the resource block which is the minimum unit of scheduling, (a2) measuring the amount of interference received by the base station apparatus for each frequency bandwidth of the resource block, (A3) A method of generating a table (interference table) indicating the amount of interference in the entire system frequency band for each frequency bandwidth of the resource block from the measurement result, and (a4) transmitting the created table to neighboring base station devices It is.

  The first interference adjustment method is used for the purpose of having a base station apparatus already affected by interference reduce the influence of neighboring base station apparatuses.

  In the second interference adjustment method, (b1) the system bandwidth is divided into the frequency bandwidths of resource blocks that are the minimum unit of scheduling, and (b2) the resource corresponding to the resource block on which the mobile station device at the cell edge is scheduled In this method, a table (interference table) in which identification bits are set for each frequency bandwidth of the block is generated, and (b3) the created table is transmitted to a neighboring base station apparatus that requires interference adjustment.

  The second interference adjustment method is used for the purpose of having a base station apparatus that has predicted in advance the occurrence of interference avoid the influence of surrounding base station apparatuses.

  In consideration of the above matters, preferred embodiments of the present invention will be described below in detail with reference to the drawings. Note that the home base station apparatus can also restrict access other than an emergency call or a user (mobile station apparatus) registered in advance. A home cell of a home base station device that restricts access by users other than registered users is called a CSG (Closed Subscriber Group) cell.

<First Embodiment>
A first embodiment of the present invention will be described below. In the present embodiment, when the base station apparatus detects a mobile station apparatus that may interfere with the home base station apparatus, additional information necessary for identifying the home base station apparatus for the mobile station apparatus On how to request.

  FIG. 1 is a diagram illustrating an example of a configuration of a communication system according to an embodiment of the present invention. In FIG. 1, a home base station apparatus A and a home base station apparatus B are arranged in the macro cell of the base station apparatus A, and a home base station apparatus C is arranged in the macro cell of the base station apparatus B. The base station apparatus and the home base station apparatus are connected to an upper control station apparatus (MEU (Mobility Management Entity) in EUTRA, Advanced ETURA) that performs mobility management of the mobile station apparatus. In addition, for the purpose of improving the efficiency of the communication path between the control station apparatus and the home base station apparatus, it is possible to provide a gateway apparatus that appropriately determines the transmission destination of the control message and optimizes the communication path. (In the example of FIG. 1, the home base station apparatus A and the home base station apparatus B are connected to the gateway apparatus).

  Furthermore, the base station apparatus has an interface (referred to as X2 interface in 3GPP) for exchanging control messages with other base station apparatuses via a network line (in the example of FIG. Base station apparatus B is connected). On the other hand, the home base station device exchanges control messages with other home base station devices or base station devices via the control station device or gateway device. The base station device may be a relay station device.

  FIG. 2 is a block diagram showing an example of the mobile station apparatus 100 according to the embodiment of the present invention. The mobile station apparatus 100 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a signal processing unit 104, a measurement processing unit 105, a control unit 105, a coding unit 107, a modulation unit 108, a transmission unit 109, and an upper layer 110. Is done. Prior to reception, mobile station apparatus control information is input from the higher layer 110 to the control unit 106, and the mobile station apparatus control information related to reception is received control information as a reception unit 101, a demodulation unit 102, a decoding unit 103, and a signal processing unit 104. Is entered appropriately. The reception control information includes information such as demodulation information, decoding information, reception frequency band information, reception timing for each channel, multiplexing method, and radio resource arrangement information as reception schedule information.

  The reception signal is received by the reception unit 101. The receiving unit 101 receives a signal in the frequency band notified by the reception control information. The received signal is input to demodulator 102. Demodulation section 102 demodulates the received signal and inputs the received signal to decoding section 103. The decoding unit 103 correctly decodes the received signal based on the reception control information. The decoding unit 103 inputs the decoded received signal to the signal processing unit 104. The signal processing unit 104 appropriately separates the received signal into downlink traffic data and downlink control data, and inputs each to the upper layer 110. In addition, the decoding unit 103 inputs a decoded received signal related to measurement to the measurement processing unit 105. The measurement processing unit 105 performs measurement processing of the reception quality of the downlink reference signal for each cell and measurement processing of the reception error rate of the downlink control channel or the downlink data channel, and averages the measured reception quality for each sample. (Filtered) downlink measurement information is generated, and the downlink measurement information is output to the upper layer 110.

  Prior to transmission, mobile station apparatus control information is input from the upper layer 110 to the control unit 106, and the mobile station apparatus control information related to transmission is appropriately transmitted to the encoding unit 107, modulation unit 108, and transmission unit 109 as transmission control information. Entered. The transmission control information includes information such as encoding information, modulation information, transmission frequency band information, transmission timing for each channel, multiplexing method, and radio resource arrangement information as uplink scheduling information of the transmission signal. Uplink traffic data and uplink control data are input from the higher layer 110 to the encoding unit 107. The encoding unit 107 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit 108. The modulation unit 108 modulates the input from the coding unit 107.

  The transmission unit 109 maps the output of the modulation unit 108 to the frequency domain, converts the frequency domain signal into a time domain signal, performs power amplification on a carrier wave of a predetermined frequency, and transmits the signal. An uplink data channel in which uplink control data is arranged typically constitutes a layer 3 message (radio resource control message; RRC message). In FIG. 2, the other components of the mobile station apparatus 100 are omitted because they are not related to this embodiment.

  FIG. 3 is a block diagram showing an example of the base station apparatus 200 according to the embodiment of the present invention. The base station apparatus 200 includes a reception unit 201, a demodulation unit 202, a decoding unit 203, a signal processing unit 204, a measurement processing unit 205, a control unit 206, a coding unit 207, a modulation unit 208, a transmission unit 209, an upper layer 210, a network The signal processing unit 211 and the peripheral information management unit 212 are configured.

  Upper layer 210 inputs downlink traffic data and downlink control data to encoding section 207. The encoding unit 207 encodes each input data and inputs the data to the modulation unit 208. Modulation section 208 modulates the encoded signal. Further, in modulation section 208, a downlink reference signal is multiplexed with the modulated signal and mapped to the frequency domain. The transmission unit 209 converts the frequency domain signal output from the modulation unit 208 into a time domain signal, places the converted signal on a carrier wave of a predetermined frequency, and performs power amplification and transmission. A downlink data channel in which downlink control data is arranged typically constitutes a layer 3 message (RRC message).

  The receiving unit 201 converts the received signal from the mobile station apparatus 100 into a baseband digital signal. The digital signal is input to the demodulation unit 202 and demodulated. The signal demodulated by the demodulating unit 202 is subsequently input to the decoding unit 203, decoded, and input to the signal processing unit 204. The signal processing unit 204 appropriately separates the received signal into uplink traffic data and uplink control data, and inputs each to the upper layer 210. In addition, the decoding unit 203 inputs a decoded received signal related to measurement to the measurement processing unit 205.

  In addition, the measurement processing unit 205 measures the reception error rate of the uplink data channel and the uplink control channel transmitted by the mobile station apparatus 100, and further receives the uplink reception quality and the frequency in resource block units for each mobile station apparatus 100. Uplink measurement information is generated by measuring band interference, and the uplink measurement information is output to the upper layer 210. Base station apparatus control information necessary for the control of each block is input from the upper layer 210 to the control unit 206, and the base station apparatus control information related to transmission is transmitted from the control unit 206 as transmission control information as an encoding unit 207, modulation. The base station apparatus control information related to reception is appropriately input as reception control information to each block of the reception unit 201, demodulation unit 202, decoding unit 203, and signal processing unit 204 in each block of the unit 208 and transmission unit 209. The

  On the other hand, the network signal processing unit 211 transmits or receives a control message between the base station devices 200 or between the control station device (or gateway device) and the base station device 200. Control messages are transmitted and received via a network line. The peripheral information management unit 212 manages network information for specifying a transmission destination or transmission source base station device (or control station device, gateway device). Network information can specify the address of each device on the network such as tracking area identifier (TAI), cell global identifier (CGI), cell identifier (PCI), network color code, Internet protocol address (IP address), etc. Consists of information. The peripheral information management unit 212 provides network information to the network signal processing unit 211 as necessary. The network signal processing unit 211 and the peripheral information management unit 212 are managed by an upper layer. In FIG. 3, the other constituent elements of the base station apparatus 200 are omitted because they are not related to the present embodiment.

  FIG. 4 is an example of a flowchart illustrating the interference adjustment method according to the first embodiment of the present invention. The mobile station apparatus in the figure may have the same configuration as the mobile station apparatus 100 in FIG. Also, the base station apparatus A in the figure and the home base station apparatus A or the home base station apparatus B may differ in transmission power, frequency bandwidth, control information to be held, etc., but the base station apparatus 200 in FIG. The same configuration may be used.

  The mobile station device is communicating with the base station device A. Further, in the macro cell of the base station apparatus A, a home base station apparatus A and a home base station apparatus B are arranged. The base station device A is connected to the home base station device A and the home base station device B via a control station device or a gateway device. In FIG. 4, the base station apparatus A has notified the mobile station apparatus of the measurement configuration necessary for the measurement of the neighboring cell, and the mobile station apparatus starts from the state of measuring the neighboring cell. . The measurement setting is transmitted by being included in the RRC message.

  Base station apparatus A, home base station apparatus A, and home base station apparatus B are operated in the same frequency band. The home cell of the home base station apparatus A is assigned PCI # 1 as the cell identifier and CGI # A as the cell global identifier, and the home cell of the home base station apparatus B is PCI # 1, the cell global identifier. As CGI # B. It is assumed that the mobile station apparatus can measure the home base station apparatus A but cannot measure the home base station apparatus B.

  At this time, the mobile station apparatus transmits an RRC message (measurement report 1) including a measurement result of reception quality of neighboring cells to the base station apparatus A periodically or in an event based on the setting of the base station apparatus A (step S10). The measurement report 1 includes at least PCI # 1, which is the cell identifier of the home base station apparatus A, as a measured peripheral cell, and the measurement result. In addition, when the home cell of the home base station device A is a CSG cell and the mobile station device can identify that the access of the mobile station device is permitted, the mobile station device is the CSG cell of the own station. The CSG identification information (CSG identifier or the like) indicating the presence is set and the measurement report 1 is transmitted.

  The base station apparatus A that has received the measurement report 1 from the mobile station apparatus determines the necessity of interference adjustment in step S11, and sets the transmission destination of a control message for interference adjustment when interference adjustment is required. The additional information request determination process is performed to determine whether or not additional information is necessary. When the base station apparatus A determines that additional information is necessary in the additional information request determination, the base station apparatus A transmits an additional information request message to the mobile station apparatus (step S12). The additional information request message includes at least a cell identifier (PCI # 1 in FIG. 4) of a cell that requires additional information.

  The mobile station apparatus that has received the additional information request message acquires necessary additional information from the home base station apparatus A (step S13). Here, as additional information acquired and reported by the mobile station device, (a) a cell global identifier (CGI # A) of the home base station device A, (b) a tracking area identifier (TAI) of the home base station device A, (C) Cell identifiers of a plurality of neighboring cells having a certain reception quality or higher can be considered.

  The information (a) is obtained from the broadcast information of the home base station apparatus A, and is suitable for identifying cells to which the same cell identifier is assigned. The information of (b) is acquired from the broadcast information of the home base station apparatus A, and is suitable when the home cells have different TAIs. The mobile station apparatus may set the information of (a) and (b). The information of (a) and (b) may require a reception interruption time (gap) for acquisition. When a gap is necessary, the mobile station apparatus temporarily interrupts communication with the base station apparatus A to acquire additional information, and tries to acquire additional information in the gap section. After the mobile station device receives the additional information request message from the base station device A, the mobile station device autonomously generates a gap and starts measurement. The information in (c) does not require gap generation.

  After acquiring additional information from the home base station apparatus A, the mobile station apparatus transmits an RRC message (measurement report 2) including the measurement result to the base station apparatus A again (step S14). The measurement report 2 includes the acquired additional information of the home base station apparatus A in addition to the cell identification information (PCI # 1) of the home base station apparatus A. In addition, if the mobile station device can identify from the received additional information that the home cell of the home base station device A is a CSG cell and the access to the mobile station device is permitted, the mobile station device Identification information (CSG identification information) indicating that the station is a CSG cell of the station is included in the measurement report 2.

  Receiving the measurement report 2 from the mobile station apparatus, the base station apparatus A performs control target base station apparatus determination, and determines a home base station apparatus that performs interference adjustment (step S15). The control target base station apparatus determination method is performed based on the additional information reported in the measurement report 2. In the case of FIG. 4, the base station apparatus A identifies the home base station apparatus A as a control target home base station apparatus based on the measurement report 2. Then, the base station apparatus A transmits the cell global identifier (CGI # A) of the home base station apparatus A to the control message (interference information) for interference adjustment to indicate that the object of interference adjustment is the home base station apparatus A. ) And transmitted to the control station apparatus or gateway apparatus (step S16). In addition, when home base station apparatus A permits access of the mobile station apparatus based on the CSG identification information, interference adjustment is unnecessary because it is sufficient to perform handover.

  In the base station apparatus A, at least one mobile station apparatus is located around the home base station apparatus A, and the frequency band in which the uplink transmission signal from the mobile station apparatus interferes with the home base station apparatus A Is set as interference information. That is, the base station apparatus A generates an interference table in which identification bits indicating uplink resource blocks assigned to mobile station apparatuses located in the vicinity of the home base station apparatus A are set as interference information. The base station apparatus A generates a control message (interference information) including the interference table and at least the cell global identifier (CGI # A) of the home base station apparatus A. The base station apparatus A may include the cell global identifier and tracking area identifier of the base station apparatus A in the control message (interference information) in order to optimize the network path.

  The control station apparatus or the gateway apparatus transfers the received interference information to the home base station apparatus A that is the transmission destination (step S17). The home base station apparatus A that has received the interference information appropriately adjusts interference based on the interference information (step S18). The base station apparatus A may be configured to be able to transmit interference information directly to the home base station apparatus A without going through the control station apparatus or the gateway apparatus. The home base station apparatus A that has received the interference information typically performs interference adjustment by performing scheduling that avoids the allocated uplink resource blocks indicated by the interference table included in the interference information. Realize.

  In addition, when the mobile station apparatus needs to generate a gap for acquiring additional information and the additional information cannot be received from the home base station apparatus A within a certain time, the additional information is received. The base station apparatus A is notified of the failure. Whether the reception has failed or not is determined as a failure when a predetermined time has elapsed since the mobile station apparatus received the additional information request message. This predetermined time may be specified for each mobile station apparatus in the additional information request message.

  Details of the additional information request determination of the base station apparatus A in step S11 of FIG. 4 will be described with reference to FIG.

  The base station apparatus A receives the measurement report 1 that is an RRC message from the mobile station apparatus (step S20). If the reported neighboring cell includes a home cell, it is confirmed whether CSG identification information indicating that the mobile station apparatus is accessible is set (step S21). When the CSG identification information is set (Yes in Step S21), the base station apparatus A determines that interference adjustment is unnecessary (Step S27), and ends the process.

  If the CSG identification information is not set (No in step S21), the reception quality of the home cell is compared with a threshold value indicating a reference that requires interference adjustment (step S22). As a result of the comparison, when the reception quality of the home cell is equal to or higher than the threshold (Yes in Step S22), the base station apparatus A determines that interference adjustment is necessary (Step S23). On the other hand, when it is less than the threshold (No in step S22), the base station apparatus A determines that interference adjustment is unnecessary (step S27), and ends the process.

  If interference adjustment is necessary, the base station apparatus A subsequently determines whether or not the home cell can be specified (step S24). When the home cell can be specified (Yes in step S24), the base station apparatus A determines that no additional information is required (step S25), and ends the process. When the home cell cannot be specified because there are a plurality of home cells to which the same cell identifier is assigned in the macro cell (No in step S24), the base station apparatus A determines that additional information is necessary. (Step S26), and the process ends.

  As described above, in the first embodiment, the base station apparatus 200 is arranged in the vicinity of the mobile station apparatus 100 with respect to the mobile station apparatus 100 in order to notify the home base station apparatus of interference to be given in the future as interference adjustment. Request additional information to identify the home base station device being used. The mobile station apparatus 100 acquires additional information for specifying the home base station apparatus, and transmits the additional information to the base station apparatus 200. The base station apparatus 200 can generate interference information related to interference adjustment based on the received additional information. By using this control, base station apparatus 200 can perform appropriate interference adjustment even when there are a plurality of cells having the same cell identifier.

  As described above, the base station apparatus 200 requests the mobile station apparatus 100 for additional information necessary for performing interference adjustment for interference that the home base station apparatus will receive in the future, and the additional information acquired by the mobile station apparatus 100 By using the information, interference adjustment can be appropriately performed on another base station apparatus 200 (home base station apparatus) that receives interference. Thus, when base station apparatus 200 performs appropriate interference adjustment, it is possible to suppress quality degradation of the uplink transmission signal of mobile station apparatus 100 caused by interference. In addition, the throughput of the mobile station device 100 is improved and the number of retransmissions is reduced, so that power consumption is reduced.

<Second Embodiment>
A second embodiment of the present invention will be described below. This embodiment is a method in which a base station apparatus that has received a request for interference adjustment from a home base station apparatus requests the mobile station apparatus for additional information necessary for specifying a mobile station apparatus located in the vicinity of the home base station apparatus About. The configuration of the communication system according to the present embodiment may be the same as that shown in FIG.

  FIG. 6 is an example of a flowchart illustrating the interference adjustment method according to the second embodiment of the present invention. The mobile station apparatus in the figure may have the same configuration as the mobile station apparatus 100 in FIG. Also, the base station apparatus A in the figure and the home base station apparatus A or the home base station apparatus B may differ in transmission power, frequency bandwidth, control information to be held, etc., but the base station apparatus 200 in FIG. The same configuration may be used.

  The mobile station device is communicating with the base station device A. Further, in the macro cell of the base station apparatus A, a home base station apparatus A and a home base station apparatus B are arranged. The base station device A is connected to the home base station device A and the home base station device B via a control station device or a gateway device. In FIG. 4, the base station apparatus A has notified the mobile station apparatus of the measurement configuration necessary for the measurement of the neighboring cell, and the mobile station apparatus starts from the state of measuring the neighboring cell. . The measurement setting is transmitted by being included in the RRC message.

  Base station apparatus A, home base station apparatus A, and home base station apparatus B are operated in the same frequency band. The home cell of the home base station apparatus A is assigned PCI # 1 as the cell identifier and CGI # A as the cell global identifier, and the home cell of the home base station apparatus B is PCI # 1, the cell global identifier. As CGI # B. It is assumed that the mobile station apparatus can measure the home base station apparatus A but cannot measure the home base station apparatus B.

  At this time, it is detected that the interference received from the neighboring cell by the home base station apparatus A (interference received from other than the mobile station apparatus of the own station) is a certain value or more, and interference adjustment is necessary for the neighboring base station apparatus A If it is determined to be notified, interference information that is a control message is generated and transmitted to the control station apparatus or the gateway apparatus (step S30).

  The home base station apparatus A sets information obtained by measuring the amount of uplink interference received by the home base station apparatus A for each resource block as interference information. That is, the home base station apparatus A generates an interference table in which a value indicating the relative magnitude of the interference amount measured for each uplink resource block is set. The home base station apparatus A generates a control message (interference information) including the interference table and at least the cell global identifier (CGI # A) of the home base station apparatus A. The home base station apparatus A may include the cell global identifier and tracking area identifier of the base station apparatus A in the control message (interference information) in order to optimize the network path.

  The control station apparatus or the gateway apparatus transfers the received interference information to the base station apparatus A that is the transmission destination (step S31). The home base station apparatus A may be configured to be able to transmit interference information directly to the base station apparatus A without going through a control station apparatus or a gateway apparatus.

  In step S32, the base station apparatus A that has received the interference information from the home base station apparatus A determines whether or not additional information for specifying the mobile station apparatus to be controlled for interference adjustment is necessary, and adds the additional information. Is required, an additional information request determination process for extracting a mobile station apparatus requesting additional information is performed. When the base station apparatus A determines that additional information is necessary in the additional information request determination, the base station apparatus A transmits an additional information request message to one or more mobile station apparatuses in step S33. The additional information request message includes at least a cell identifier (PCI # 1 in FIG. 6) of a cell that requires additional information.

  The mobile station apparatus that has received the additional information request message acquires necessary additional information from the home base station apparatus A (step S34). Here, the additional information that is acquired and reported by the mobile station apparatus uses the same information as described in the first embodiment.

  After acquiring additional information from the home base station apparatus A, the mobile station apparatus transmits an RRC message (measurement report) including a measurement result to the base station apparatus A (step S35). The measurement report includes at least the acquired additional information of the home base station apparatus A in addition to the cell identification information (PCI # 1) of the home base station apparatus A. The base station apparatus A that has received the measurement report from the mobile station apparatus identifies a mobile station apparatus that requires interference adjustment based on the additional information reported in the measurement report, and performs interference adjustment for the identified mobile station apparatus. This is performed (step S36).

  The interference adjustment performed by the base station apparatus A typically refers to the amount of interference for each uplink resource block indicated by the interference table included in the interference information received in step S31, and the amount of interference is large. Scheduling is performed avoiding resource blocks, or scheduling is performed so as to reduce transmission power in resource blocks with a large amount of interference, thereby reducing interference.

  In addition, when the mobile station apparatus needs to generate a gap for acquiring additional information, and additional information cannot be received from the home base station apparatus A within a certain period of time, the additional information is received. The base station apparatus A is notified of the failure. Whether the reception has failed or not is determined as a failure when a predetermined time has elapsed since the mobile station apparatus received the additional information request message. This predetermined time may be specified for each mobile station apparatus in the additional information request message.

  Details of the additional information request determination of the base station apparatus A in step S32 of FIG. 6 will be described using FIG.

  Base station apparatus A receives interference information as a control message from home base station apparatus A (step S40). Then, the cell identifier of the home cell of the home base station apparatus A is specified from the cell global identifier included in the interference information, and it is determined whether another home cell with the same cell identifier is arranged in its own macro cell. (Step S41). If there is no home cell with the same cell identifier, the base station apparatus A determines that no additional information is required (No in step S41), and ends the process. When a home cell with the same cell identifier exists (Yes in step S41), the base station apparatus A determines that additional information is necessary (step S43). Then, the mobile station apparatus that requests additional information is extracted (step S44), and the process ends.

  In step S44, the base station apparatus A needs additional information for the mobile station apparatus whose reception quality of the home cell (PCI # 1) included in the measurement report reported from the mobile station apparatus is a certain value or more. Judge that there is. That is, the base station apparatus A has extracted a mobile station apparatus that may be located in the vicinity of the home base station apparatus A in step S44 (actually located in the vicinity of the home base station apparatus B). In some cases).

  As described above, in the second embodiment, the base station apparatus 200 identifies the mobile station apparatus 100 arranged in the vicinity of the home base station apparatus according to the notification of interference adjustment from the home base station apparatus. Request the mobile station device 100 for additional information. The mobile station device 100 acquires additional information for specifying which home base station device is located in the vicinity, and transmits the additional information to the base station device 200. The base station apparatus 200 can perform interference adjustment based on the received additional information. By using this control, base station apparatus 200 can perform appropriate interference adjustment even when there are a plurality of cells having the same cell identifier.

  As described above, base station apparatus 200 requests mobile station apparatus 100 for additional information necessary for interference adjustment with respect to interference received by the home base station apparatus, and mobile station apparatus 100 has acquired the information. By using the additional information, interference adjustment can be appropriately performed on another base station apparatus 200 (home base station apparatus) that receives interference. Thus, when base station apparatus 200 performs appropriate interference adjustment, it is possible to suppress quality degradation of the uplink transmission signal of mobile station apparatus 100 caused by interference. In addition, the throughput of the mobile station device 100 is improved and the number of retransmissions is reduced, so that power consumption is reduced.

<Third Embodiment>
A third embodiment of the present invention will be described below. In this embodiment, a condition for a base station device that includes a home base station device in its own macro cell to receive additional information necessary for specifying a mobile station device located in the vicinity of the home base station device is set in advance. The present invention relates to a method in which a mobile station apparatus that is set and satisfies a condition autonomously receives additional information from a home base station and reports the received additional information to the base station apparatus. The configuration of the communication system according to the present embodiment may be the same as that shown in FIG.

  FIG. 8 is an example of a flowchart illustrating the interference adjustment method of the third embodiment of the present invention. The mobile station apparatus in the figure may have the same configuration as the mobile station apparatus 100 in FIG. Also, the base station apparatus A in the figure and the home base station apparatus A or the home base station apparatus B may differ in transmission power, frequency bandwidth, control information to be held, etc., but the base station apparatus 200 in FIG. The same configuration may be used.

  The mobile station device is communicating with the base station device A. Further, in the macro cell of the base station apparatus A, a home base station apparatus A and a home base station apparatus B are arranged. Similarly to FIG. 4, the base station apparatus A is connected to the home base station apparatus A and the home base station apparatus B via a control station apparatus or a gateway apparatus (not shown).

  Base station apparatus A transmits an additional information reception condition to the mobile station apparatus using the RRC message. The additional information reception condition is preferably included in the broadcast information or the measurement setting for each mobile station device. The base station apparatus A transmits a cell identifier (PCI # 1 in FIG. 8) of the home cell that requires at least additional information as additional information reception conditions (step S50). Further, the base station apparatus A can include (1) a plurality of cell identifiers and (2) a threshold value indicating the start of reception of additional information as necessary.

  After receiving the additional information reception condition from the base station apparatus A, the mobile station apparatus performs additional information acquisition determination for determining whether or not necessary additional information is received from the home cell (step S51). When it is determined that additional information is necessary, the mobile station apparatus receives necessary additional information from the home base station apparatus A (step S52). Here, the additional information that is acquired and reported by the mobile station apparatus uses the same information as described in the first embodiment. After acquiring additional information from the home base station apparatus A, the mobile station apparatus transmits an RRC message (measurement report) including a measurement result to the base station apparatus A (step S53).

  The measurement report includes at least the acquired additional information of the home base station apparatus A in addition to the cell identification information (PCI # 1) of the home base station apparatus A. The base station apparatus A that has received the measurement report from the mobile station apparatus identifies a mobile station apparatus that requires interference adjustment based on the additional information reported in the measurement report, and performs interference adjustment for the identified mobile station apparatus. Do.

  Details of the mobile station apparatus additional information acquisition determination in step S51 of FIG. 8 will be described with reference to FIG.

  When the mobile station apparatus receives the additional information reception condition from the base station apparatus A, the mobile station apparatus sets a condition for starting reception of the additional information in advance, and determines whether or not the condition is satisfied by measuring neighboring cells. Based on the result (step S60). If the condition is not satisfied, the mobile station apparatus determines that additional information is not necessary (step S61), and ends the process. On the other hand, if the condition is satisfied, the mobile station apparatus determines that additional information is necessary, receives the additional information from the home cell (step S62), and ends the process.

  Hereinafter, an example of determining whether or not the mobile station apparatus satisfies the condition in step S60 is shown for each condition set by the base station apparatus A. For example, when the mobile station apparatus is notified of only the cell identifier (PCI # 1) of the home cell that needs additional information and detects the cell identifier (PCI # 1) of the home cell, it is necessary. It is determined that additional information is received from the home cell of PCI # 1. Further, when a threshold value indicating the start of reception of additional information is included, the mobile station apparatus is necessary when the reception quality of the PCI # 1 home cell exceeds the threshold value (that is, when the mobile station approaches the home cell). It is determined that additional information is received from the home cell.

  In addition, when a plurality of cell identifiers other than the cell identifier (PCI # 1) of the home cell requiring additional information are included, the mobile station apparatus is notified of the cell identifier (PCI # 1) of the home cell. When all of the home cells having a plurality of cell identifiers are detected, it is determined that necessary additional information is received from the home cell of PCI # 1.

  In this way, the base station apparatus A utilizes the fact that the cell identifiers of neighboring cells that can be measured in the vicinity of the home cell do not change frequently because the cell radius of the home cell is relatively small, By including, the detection accuracy of the home base station apparatus near the mobile station apparatus can be increased.

  Further, when both a plurality of cell identifiers other than the cell identifier (PCI # 1) of the home cell requiring additional information and the threshold value are included, the mobile station apparatus selects the cell identifier (PCI # 1) of the home cell. When the reception quality of the home cells of the plurality of cell identifiers notified as above all exceed the threshold value, it is determined that necessary additional information is received from the home cell of PCI # 1. Note that a plurality of home cell identifiers that require additional information may be specified simultaneously instead of one, and a range of home cell cell identifiers (for example, PCI # n to PCI # m) is specified. It may be.

  As described above, in the third embodiment, the mobile station device 100 sends a measurement report to the base station device 200 twice (measurement report 1 (step S10) and measurement report 2 (step S14) in FIG. 4). There is no need to transmit, and when the condition indicating that additional information received in advance from the base station apparatus 200 is required, the additional information is acquired autonomously, and additional information is added to one measurement report. To the base station apparatus 200. The base station apparatus 200 can perform interference adjustment based on the received additional information. By using this control, signaling from the base station apparatus 200 to the mobile station apparatus 100 can be reduced.

  As described above, base station apparatus 200 transmits in advance a condition for mobile station apparatus 100 to autonomously receive and report additional information necessary for performing interference adjustment with respect to the home base station apparatus. To do. Thus, base station apparatus 200 transmits a condition that requires additional information to mobile station apparatus 100 in advance, so that signaling between base station apparatus 200 and mobile station apparatus 100 can be reduced. In addition, the processing time until the interference adjustment is started can be shortened. In addition, since no gap generation is required, communication is not interrupted in the gap section, and communication quality is improved.

<Fourth Embodiment>
A fourth embodiment of the present invention will be described below. This embodiment considers that the interference adjustment for the home base station device is actually effective only when the home base station device is in communication with the home mobile station device, and the home base station device is communicating ( The present invention relates to a method for notifying a base station apparatus whether it is an active state) or a non-communication state (idle state). The configuration of the communication system according to the present embodiment may be the same as that shown in FIG.

  The home base station apparatus of the present embodiment manages its own state information (active state, idle state). When the home base station device starts communication with the home mobile station device (or when emergency call communication is started with any mobile station device), the home base station device becomes active with respect to the surrounding base station devices. This is notified using a control message between base station apparatuses. On the other hand, when communication between the mobile station device and the home mobile station device is terminated due to an end call or a handover, the control between the base station devices is performed when the own station is in an idle state with respect to the surrounding base station devices Notify using a message.

  Note that the home base station device notifies the control station device or gateway device of the status information of its own station instead of the base station device, and the control station device or gateway device manages the status information of a plurality of home base station devices. You may do it. Further, the base station apparatus can inquire state information to one or more home base station apparatuses using a control message between the base station apparatuses. When the control station apparatus or gateway apparatus manages the status information of the home base station apparatus, the base station apparatus may inquire the control station apparatus or gateway apparatus for the status information of one or more home base station apparatuses. Is possible.

  In order to determine whether or not interference adjustment is necessary, the base station apparatus according to the present embodiment considers state information of the home base station apparatus that is a target of interference adjustment in addition to the determination method according to the first embodiment. That is, the base station apparatus determines that interference adjustment is necessary when the home base station apparatus is in an active state and the mobile station apparatus is located in the vicinity of the home base station apparatus. When the control station apparatus or the gateway apparatus manages the status information of the home base station apparatus, the control station apparatus or the gateway apparatus is in the idle state with a control message (interference information) for interference adjustment transmitted by the base station apparatus. It is also possible to perform control not to transfer to the base station apparatus.

  As described above, in the fourth embodiment, the home base station apparatus uses the base station apparatus 200 (or the control station) as the state information indicating whether the home base station apparatus is in communication (active state) or in the non-communication state (idle state). Device, gateway device). Base station apparatus 200 determines whether or not interference adjustment is performed based on the status information of the home base station apparatus. By using this control, the base station apparatus 200 does not need to transmit a control message (interference information) for unnecessary interference adjustment.

  As described above, the home base station apparatus transmits state information indicating whether or not the home base station apparatus is communicating to the base station apparatus 200. Since the base station apparatus 200 determines whether or not interference adjustment is performed based on the state information of the home base station apparatus, a control message (interference information) for unnecessary interference adjustment is suppressed, and the load on the network line is reduced. be able to.

  The embodiment described above is merely an example, and can be realized using various modifications and replacement examples. For convenience of explanation, the mobile station device 100 and the base station device 200 of the embodiment have been described using functional block diagrams. However, the functions of each part of the mobile station device 100 and the base station device 200 or a part of these functions are described. A program for realization is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to control the mobile station apparatus 100 and the base station apparatus 200. Also good. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Furthermore, the “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. .

  Each functional block used in each of the above embodiments may be realized as an LSI that is typically an integrated circuit. Each functional block may be individually formed into chips, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

DESCRIPTION OF SYMBOLS 100 ... Mobile station apparatus 200 ... Base station apparatus 101, 201 ... Reception part 102, 202 ... Demodulation part 103, 203 ... Decoding part 104, 204 ... Signal processing part 105, 205 ... Measurement processing part 106, 206 ... Control part 107, 207: Encoding unit 108, 208 ... Modulating unit 109, 209 ... Transmitting unit 110, 210 ... Upper layer 211 ... Network signal processing unit 212 ... Peripheral information management unit

Claims (22)

A mobile station apparatus, a first base station apparatus that manages a macro cell, and a second base station apparatus that manages a home cell, and performs uplink interference adjustment with the first base station apparatus and the second base station. A communication system between station devices,
The first base station apparatus determines whether or not it is necessary to specify the second base station apparatus in the vicinity of the mobile station apparatus for interference adjustment, and determines that it is necessary to specify Requesting the mobile station device to transmit additional information necessary for identifying the second base station device,
The mobile station device acquires the additional information based on a request from the first base station device, transmits at least the additional information to the first base station device,
The first base station apparatus generates a control message related to interference adjustment based on the additional information, and transmits the control message to the second base station apparatus.   When the second base station apparatus having the same cell identifier exists in a macro cell managed by the first base station apparatus, the first base station apparatus performs the first base station apparatus with respect to the mobile station apparatus. 2. The communication system according to claim 1, wherein the communication system determines that it is necessary to request transmission of additional information necessary for specifying the two base station apparatuses.   The first base station apparatus has one or more mobile station apparatuses located in the vicinity of the second base station apparatus when the mobile station apparatus that interferes with the second base station apparatus cannot be specified. The communication system according to claim 1, wherein it is determined that it is necessary to request transmission of additional information necessary for specifying the second base station device.   The first base station apparatus requests the mobile station apparatus to transmit additional information necessary for identifying the second base station apparatus when the second base station apparatus is in a communication state The communication system according to claim 1, wherein it is determined that it is necessary to perform the operation.   The said additional information is either the cell global identifier contained in the alerting | reporting information of a said 2nd base station apparatus, a tracking area identifier, or both, The any one of Claim 2 to 4 characterized by the above-mentioned. Communication system.   When the mobile station apparatus is requested by the first base station apparatus to transmit the additional information necessary for specifying the second base station apparatus, the mobile station apparatus autonomously acquires a gap for acquiring the additional information. The communication system according to claim 5, wherein the additional information is acquired by generating a section.   The communication system according to any one of claims 2 to 4, wherein the additional information is a cell identifier of a neighboring cell of the second base station apparatus having a certain reception quality or higher. A mobile station apparatus, a first base station apparatus that manages a macro cell, and a second base station apparatus that manages a home cell, and performs uplink interference adjustment with the first base station apparatus and the second base station. A base station apparatus in a communication system performed between station apparatuses,
The first base station apparatus determines whether or not it is necessary to specify the second base station apparatus in the vicinity of the mobile station apparatus for interference adjustment, and determines that it is necessary to specify Requesting the mobile station device to transmit additional information necessary for identifying the second base station device,
Receiving the additional information acquired and transmitted by the mobile station device;
A base station apparatus that generates a control message related to interference adjustment based on the additional information and transmits the control message to the second base station apparatus.   When the second base station apparatus having the same cell identifier exists in a macro cell managed by the first base station apparatus, the first base station apparatus performs the first base station apparatus with respect to the mobile station apparatus. 9. The base station apparatus according to claim 8, wherein the base station apparatus determines that it is necessary to request transmission of additional information necessary for identifying the two base station apparatuses.   The first base station apparatus has one or more mobile station apparatuses located in the vicinity of the second base station apparatus when the mobile station apparatus that interferes with the second base station apparatus cannot be specified. The base station apparatus according to claim 8, wherein the base station apparatus determines that it is necessary to request transmission of additional information necessary for identifying the second base station apparatus.   The first base station apparatus requests the mobile station apparatus to transmit additional information necessary for specifying the second base station apparatus when the second base station apparatus is in a communication state. The base station apparatus according to claim 8, wherein it is determined that it is necessary to perform the operation. A mobile station apparatus, a first base station apparatus that manages a macro cell, and a second base station apparatus that manages a home cell, and performs uplink interference adjustment with the first base station apparatus and the second base station. A mobile station apparatus in a communication system performed between station apparatuses,
The mobile station apparatus determines whether or not to transmit additional information necessary for specifying the second base station apparatus to the first base station apparatus, and determines that the additional information is to be transmitted when the additional information is transmitted. And at least the additional information is transmitted to the first base station apparatus.   The mobile station apparatus determines that transmission of the additional information is necessary when the additional information necessary for specifying the second base station apparatus is required from the first base station apparatus The mobile station apparatus according to claim 12, wherein:   When the mobile station apparatus satisfies an additional information reception condition for starting acquisition of the additional information necessary for specifying the second base station apparatus notified in advance from the first base station apparatus The mobile station apparatus according to claim 12, further determining that transmission of the additional information is necessary.   The mobile station apparatus according to claim 14, wherein the additional information reception is one of a plurality of cell identifiers and a threshold value indicating start of reception of additional information, or both. A mobile station device, a first base station device that manages a macro cell, and a second base station device that manages a home cell, and an uplink between the first base station device and the second base station device Link interference adjustment method,
In the first base station apparatus, determining whether it is necessary to specify the second base station apparatus in the vicinity of the mobile station apparatus for interference adjustment, and determining that it is necessary Requesting the mobile station apparatus to transmit additional information necessary for identifying the second base station apparatus when determined,
In the mobile station device, including the step of acquiring the additional information based on a request of the first base station device, and transmitting at least the additional information to the first base station device,
The first base station apparatus includes a step of generating a control message related to interference adjustment based on the additional information, and a step of transmitting the control message to the second base station apparatus. Adjustment method.   In the first base station apparatus, when the second base station apparatus having the same cell identifier exists in a macro cell managed by the first base station apparatus, the second base station apparatus The interference adjustment method according to claim 16, wherein it is determined that it is necessary to request transmission of additional information necessary for specifying the two base station apparatuses.   In the first base station apparatus, when the mobile station apparatus that interferes with the second base station apparatus cannot be specified, the one or more mobile station apparatuses located in the vicinity of the second base station apparatus The interference adjustment method according to claim 16, wherein it is determined that it is necessary to request transmission of additional information necessary for specifying the second base station apparatus.   In the first base station apparatus, when the second base station apparatus is in a communication state, the mobile station apparatus requests transmission of additional information necessary for identifying the second base station apparatus. 17. The interference adjustment method according to claim 16, wherein it is determined that it is necessary to perform the interference adjustment.   The said additional information is either a cell global identifier contained in the alerting | reporting information of a said 2nd base station apparatus, a tracking area identifier, or both, The any one of Claims 17-19 characterized by the above-mentioned. Interference adjustment method.   In the mobile station apparatus, when the transmission of the additional information necessary for specifying the second base station apparatus is requested from the first base station apparatus, an autonomous gap is obtained for acquiring the additional information. 21. The interference adjustment method according to claim 20, wherein the additional information is acquired by generating a section. The interference adjustment method according to any one of claims 17 to 19, wherein the additional information is a cell identifier of a neighboring cell of the second base station apparatus having a certain reception quality or higher.