JP2013187835A - Random access control device, radio base station device, management device, and random access control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately perform setting of random access signals for adjusting timing of transmission from a radio base station device to a radio terminal device, where the signals are transmitted/received prior to establishment of communication connection between the radio terminal device and radio base station device.SOLUTION: A random access control device comprises: a random access information acquisition unit 11 for acquiring setting information on a base station around a target base station, where the setting information is about a random access signal that is detected by a radio base station device to adjust timing of transmission from a radio terminal device to the radio base station device and is transmitted by the radio terminal device before the radio terminal device establishes communication connection with the radio base station device; and a random access setting unit 12 for performing setting about a random access signal to be transmitted to the target base station by the radio terminal device on the basis of the setting information.

Description

  The present invention relates to a random access control device, a radio base station device, a management device, and a random access control program, and in particular, a random access control device, a radio base station device, a management device, and a random access control for setting a random access signal. Regarding the program.

  Conventionally, in a mobile communication system, a communication service is provided by a radio base station apparatus (hereinafter also referred to as a macro base station) that forms an area in which a cell having a radius of several hundred meters to several tens of kilometers, that is, a radio terminal apparatus can communicate. It was.

  In recent years, due to a dramatic increase in the number of subscribers of mobile communication services and an increase in the amount of communication traffic due to data communication, subscribers and communication traffic are distributed by forming smaller radius cells, and a certain level of communication It is desirable to provide speed to users in a stable manner. In addition, in order to deal with dead zones associated with the increase in the number of buildings, it is desired to install radio base station devices on the corporate floor and in ordinary households.

  Together with these demands, the processing capability of various devices used in the radio base station apparatus has been dramatically improved, and the miniaturization of the radio base station apparatus has progressed. Collecting.

  Since the radius of the femto cell (Femto Cell) formed by this small base station (hereinafter also referred to as a femto base station) is as small as about 10 meters, the femto base station is the macro cell (Macro Cell) formed by the macro base station. It may be used in places such as indoors and underground malls where it is out of service area and it is difficult to install macro base stations.

  In addition, since many femto base stations are installed in a specific area, it is difficult to connect the femto base stations directly to the core network. For this reason, it is conceivable that a large number of femto base stations installed in a specific area are once connected to a gateway device such as a HeNB-GW, and the femto base station and the core network are connected via the HeNB-GW.

  In addition to the femto base station, a pico base station that forms a pico cell having a radius of 100 to 200 meters, for example, has been developed based on a macro base station.

  Here, before the wireless terminal device establishes a communication connection with the wireless base station device, RACH (Random Access Channel) transmitted and received between the wireless terminal device and the wireless base station device is 3GPP TS 36.211 V10.4.0 2011.12 (Non-Patent Document 1). The radio base station apparatus adjusts the transmission timing from the radio terminal apparatus to itself using RACH, thereby enabling good communication between itself and the radio terminal apparatus.

3GPP TS 36.211 V10.4.0 2011.12

  A femto base station or a pico base station is often arranged unplanned compared to a macro base station, and activation and deactivation may be dynamically controlled according to increase or decrease of communication load in a communication system. . For this reason, optimal parameter settings regarding RACH, such as transmission timing and transmission power, are not constant and may change.

  If the RACH parameter setting is not appropriate, the wireless terminal device cannot establish a communication connection with the wireless base station device, a delay occurs in establishing the communication connection, and a delay occurs in the handover operation of the wireless terminal device Various problems arise.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to transmit and receive data from a radio base station apparatus that is transmitted and received prior to establishing a communication connection between the radio terminal apparatus and the radio base station apparatus. Random access control apparatus, radio base station apparatus, management apparatus, and random access control capable of constructing good communication system by appropriately setting random access signal for adjusting transmission timing to terminal apparatus Is to provide a program.

  (1) In order to solve the above-described problem, a random access control device according to an aspect of the present invention is detected by the radio base station device in order to adjust transmission timing from the radio terminal device to the radio base station device. The setting information of the random access signal transmitted from the wireless terminal device prior to the wireless terminal device establishing a communication connection with the wireless base station device, the setting information of the target base station that is the target wireless base station device Based on the setting information acquired by the random access information acquisition unit and the random access information acquisition unit for acquiring the setting information of the neighboring base station that is a neighboring radio base station device, wirelessly transmits to the target base station A random access setting unit for performing settings related to the random access signal to be transmitted by the terminal device.

  As described above, the configuration in which the setting related to the random access signal of the target base station is performed based on the setting information of the random access signal in the neighboring base station, makes it possible to perform the optimal setting according to the installation environment of the radio base station apparatus. Therefore, a good communication system can be constructed by appropriately setting a random access signal. In addition, since it is possible to automatically set parameters related to random access signals of femto base stations and pico base stations that are often installed unplanned, CAPEX (Capital Expenditure), that is, costs associated with the arrangement of radio base station apparatuses , And OPEX (Operational Expenditure), that is, the cost for operating the radio base station apparatus can be reduced.

  (2) Preferably, the random access control device further includes a broadcast information receiving unit for receiving broadcast information transmitted from the neighboring base station to the wireless terminal device, and the random access information acquiring unit includes: The setting information of the neighboring base station is acquired from the broadcast information.

  As described above, by using the broadcast information transmitted by the neighboring base stations, for example, the setting information of the neighboring base stations can be acquired by simple processing without transmitting / receiving special information between the radio base station apparatuses. it can.

  (3) Preferably, the random access information acquisition unit acquires the setting information from the peripheral base station via a predetermined logical interface between the radio base station devices.

  As described above, the configuration using the logical interface between the radio base station devices allows the neighboring base station to perform simple processing without receiving and analyzing, for example, broadcast information transmitted from the neighboring base station at the radio base station device. Setting information can be acquired.

  (4) Preferably, the random access information acquisition unit acquires, as the setting information, information on resources used for transmission of the random access signal specified by the neighboring base station to the wireless terminal device, and The random access setting unit sets a resource used for transmission of the random access signal to be transmitted by the wireless terminal device to the target base station, based on the setting information acquired by the random access information acquisition unit.

  With such a configuration, it is possible to prevent the transmission timing, transmission frequency, and the like of the random access signal from overlapping between the radio base station apparatuses. Therefore, the detection characteristics of the random access signal are improved and a good communication system is constructed. be able to.

  (5) Preferably, the random access information acquisition unit uses, as the setting information, one or more types of random access signals specified by the neighboring base station for the wireless terminal device from among a plurality of types of random access signals. The random access setting unit sets one or more types of the random access signals that can be transmitted by the wireless terminal device to the target base station based on the setting information acquired by the random access information acquisition unit. To do.

  As described above, the configuration in which the type of the random access signal of the target base station is set based on the type of the random access signal in the neighboring base station prevents the same type of random access signal from being used between the radio base station devices. Therefore, the detection characteristic of the random access signal can be improved and a good communication system can be constructed. In addition, in the case where the number of installed radio base station devices increases, and even if the transmission timing and transmission frequency of the random access signal are adjusted, these are duplicated between the respective radio base station devices, the type of random access signal By preventing duplication, it is possible to prevent erroneous communication connection processing between the wireless terminal device and the wireless base station device.

  (6) In order to solve the above-described problem, a radio base station apparatus according to an aspect of the present invention includes the random access control apparatus according to (1).

  With such a configuration, each radio base station apparatus can set a random access signal in a radio communication system, so that it is possible to distribute setting information related to the random access signal and acquisition of random access signal setting information. it can.

  (7) More preferably, the random access information acquisition unit acquires the setting information of the radio base station device included in the neighboring base station list held by the own radio base station device.

  With such a configuration, it is possible to recognize an appropriate radio base station apparatus as a setting information acquisition target, and thus it is possible to efficiently acquire setting information.

  (8) In order to solve the above-described problem, a management apparatus according to an aspect of the present invention manages one or a plurality of radio base station apparatuses, and includes the random access control apparatus according to (1).

  With such a configuration, since it is possible to collectively set the random access signal of each radio base station device in the radio communication system in the management device, acquisition of the setting information of the random access signal and the setting related to the random access signal, It can be performed more efficiently.

  (9) In order to solve the above-described problem, a random access control program according to an aspect of the present invention is a random access control program used in a random access control device, and is transmitted from a wireless terminal device to a wireless base station device. Random access signals detected by the radio base station apparatus to adjust the transmission timing to the radio terminal apparatus and transmitted from the radio terminal apparatus prior to the radio terminal apparatus establishing a communication connection with the radio base station apparatus , The step of acquiring the setting information of the peripheral base station that is a radio base station device around the target base station that is the target radio base station device, and the target based on the acquired setting information Performing a setting relating to the random access signal to be transmitted by the wireless terminal device to the base station. Is a program of the order to.

  As described above, the configuration in which the setting related to the random access signal of the target base station is performed based on the setting information of the random access signal in the neighboring base station, makes it possible to perform the optimal setting according to the installation environment of the radio base station apparatus. Therefore, a good communication system can be constructed by appropriately setting a random access signal. In addition, since it is possible to automatically set parameters related to random access signals of femto base stations and pico base stations that are often installed unplanned, CAPEX (Capital Expenditure), that is, costs associated with the arrangement of radio base station apparatuses , And OPEX (Operational Expenditure), that is, the cost for operating the radio base station apparatus can be reduced.

  According to the present invention, a random access signal for adjusting transmission timing from a radio base station apparatus to a radio terminal apparatus, which is transmitted / received prior to establishing a communication connection between the radio terminal apparatus and the radio base station apparatus, is transmitted. A suitable communication system can be constructed by appropriately performing the setting.

It is a figure which shows the structure of the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the radio base station apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the random access sequence in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of base station arrangement | positioning in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the collision of the RACH resource in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the control part in the radio base station apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the setting operation | movement of the RACH parameter in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the collision avoidance of the RACH resource in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is the flowchart which defined an example of the operation | movement procedure at the time of the radio base station apparatus which concerns on the 1st Embodiment of this invention setting a RACH parameter. It is a figure which shows an example of the setting operation | movement of the RACH parameter in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is the sequence diagram which defined an example of the operation | movement procedure at the time of the radio base station apparatus which concerns on the 1st Embodiment of this invention setting a RACH parameter. It is a figure which shows an example of the RACH database which the radio base station apparatus which concerns on the 1st Embodiment of this invention produces. It is a figure which shows an example of the update of the RACH database which the radio base station apparatus which concerns on the 1st Embodiment of this invention produces. It is a figure which shows an example of the setting operation | movement of the RACH parameter in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is the sequence diagram which defined an example of the RACH parameter setting sequence in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the preamble set in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the incorrect communication connection process by duplication of RACH preamble in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is the flowchart which defined an example of the operation | movement procedure at the time of the radio base station apparatus which concerns on the 2nd Embodiment of this invention setting a RACH parameter. It is the sequence diagram which defined an example of the operation | movement procedure at the time of the radio base station apparatus which concerns on the 2nd Embodiment of this invention setting a RACH parameter. It is a figure which shows an example of the RACH database which the radio base station apparatus which concerns on the 2nd Embodiment of this invention produces. It is the sequence diagram which defined an example of the RACH parameter setting sequence in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The radio base station apparatus notifies the radio terminal apparatus of information about the cell and the neighboring cell that it forms, that is, the frequency of the radio signal and the ID (identification) of the neighboring cell. The wireless terminal device detects and measures neighboring cells based on information notified from the wireless base station device. Based on this measurement result, movement of the wireless terminal device to the neighboring cells is started. Here, “movement” of the wireless terminal device means not only handover but also through which cell the wireless terminal device in an idle state starts communication in the future, that is, when a call or data communication is started. This means selecting whether to perform communication.

  Specifically, in addition to meaning handover, for example, an idle radio terminal device described in 3GPP TS 36.304 V10.3.0 2011.10. This means cell reselection for selecting a radio base station apparatus to be a communication partner based on the measurement result of the radio signal from.

  For example, when the wireless terminal device is communicating with the wireless base station device, the destination of the wireless terminal device is determined by the wireless base station device or a higher-level device in the core network. For example, when the wireless terminal device is not communicating with the wireless base station device, the wireless terminal device determines the destination of the wireless terminal device.

  In addition, handover means that a radio base station apparatus that is a communication partner of a radio terminal apparatus during a call or data communication is switched.

  The “idle state” of a wireless terminal device is a state in which a wireless base station device has selected a wireless base station device as a communication partner and is not communicating with the wireless base station device. In addition, the “state where communication is not performed” is a state where an operation for transmitting some information to the radio base station apparatus is not performed.

  Note that the definition of “Idle Mode” defined in 3GPP may be used as the definition of the “idle state” of the wireless terminal device.

  The wireless terminal device is located in a cell means that the wireless terminal device selects a wireless base station device forming the cell as a communication destination and can communicate with the wireless base station device. This means that communication is in progress.

  The femtocell and access mode are described in 3GPP (Third Generation Partnership Project) SPEC TS 22.22 as follows. That is, a femto base station is a customer premises apparatus that connects a wireless terminal device connected via a wireless interface to a mobile communication carrier network using an IP backhaul.

  Further, in the femtocell access mode, the femto base station in the closed access mode provides a service only to related CSG (Closed Subscriber Group) members. The hybrid mode femto base station also provides services to the associated CSG members and CSG non-members. The femto base station in the open access mode operates as a normal base station.

  Such a 3GPP definition may also be applied to the wireless communication system according to the embodiment of the present invention.

  Further, the following definitions can be applied together with or separately from the above definitions.

  The macro base station and the pico base station are wireless base station devices that are under the management of the operator and can communicate with the wireless base station device that has contracted with the operator. Further, it is considered that the macro base station and the pico base station are basically not turned off.

  A femto base station is a radio base station apparatus that is installed mainly in an individual or corporate building and may move or be turned off depending on the circumstances of the user.

  Further, the femto base station operates in one of open / hybrid / closed access modes. When the femto base station operates in the closed access mode, only registered members (terminals) can be connected. When operating in the closed access mode, the service is provided only to registered members. When operating in the hybrid mode, the service is provided to both registered members and unregistered members, that is, non-members. When operating in the open access mode, the same operation as that of the macro base station and the pico base station is performed.

<First Embodiment>
[Basic configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 1, a wireless communication system 301 is a mobile communication system that complies with, for example, LTE (Long Term Evolution) standardized by 3GPP (Third Generation Partnership Project), and includes femto base stations 101A, 101B, and 101C. A pico base station 101D, a macro base station 201, and a gateway device 203 are provided.

  Hereinafter, each of the femto base stations 101A, 101B, and 101C, the pico base station 101D, and the macro base station 201 may be referred to as a radio base station apparatus 101. In FIG. 1, one macro base station, one pico base station, and three femto base stations are representatively shown, but the combination and number thereof are not limited thereto.

  The femto base stations 101A, 101B, and 101C form femtocells FCA, FCB, and FCC having a radius of several tens of meters, for example. Further, the pico base station 101D forms a picocell PC having a radius of 100 meters to 200 meters. The macro base station 201 forms a macro cell MC having a radius of several kilometers, for example.

  The femto base stations 101A, 101B, and 101C are installed in places where it is difficult for the wireless terminal device 202 to receive radio signals from the macro base station 201 and the pico base station 101D, such as an underground mall, and are respectively located in the femtocells FCA, FCB, and FCC. It is possible to communicate with the wireless terminal device 202 by transmitting and receiving wireless signals to and from the existing wireless terminal device 202.

  The pico base station 101D can communicate with the radio terminal device 202 by transmitting and receiving radio signals to and from the radio terminal device 202 existing in the pico cell PC. The macro base station 201 can communicate with the wireless terminal device 202 by transmitting and receiving wireless signals to and from the wireless terminal device 202 existing in the macro cell MC.

  The gateway device 203 performs relay processing of various communication data transmitted between the femto base stations 101A, 101B, and 101C and the host device 205 in the core network 204.

  The host device 205 is, for example, an MME (Mobility Management Entity), and manages information on the entire wireless communication system 301. For example, the upper device 205 acquires and stores information on each radio base station device in the radio communication system 301.

  Here, the direction from the wireless terminal device 202 to the core network 204 is referred to as an uplink direction, and the direction from the core network 204 to the wireless terminal device 202 is referred to as a downlink direction.

  FIG. 2 is a diagram illustrating the configuration of the radio base station apparatus according to the first embodiment of the present invention.

  Referring to FIG. 2, radio base station apparatus 101 includes antenna 91, circulator 92, radio reception unit 93, radio transmission unit 94, signal processing unit 95, and control unit 98. The signal processing unit 95 includes a reception signal processing unit 96 and a transmission signal processing unit 97. The signal processing unit 95 and the control unit 98 are realized by a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).

  The circulator 92 outputs the radio signal from the radio terminal device 202 received by the antenna 91 to the radio reception unit 93 and outputs the radio signal received from the radio transmission unit 94 to the antenna 91.

  Radio receiving section 93 converts the radio signal received from circulator 92 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to received signal processing section 96.

  The received signal processing unit 96 performs signal processing such as despreading in the CDMA (Code Division Multiple Access) method on the digital signal received from the wireless receiving unit 93, and part or all of the digital signal after this signal processing is performed. The data is converted into a predetermined frame format and transmitted to the core network side.

  The transmission signal processing unit 97 performs IFFT (Inverse Fast Fourier Transform) in an OFDM (Orthogonal Frequency Division Multiplex) method on communication data obtained by converting communication data received from the core network side into a predetermined frame format or communication data generated by itself. The digital signal after the signal processing is output to the wireless transmission unit 94.

  The radio transmission unit 94 converts the digital signal received from the transmission signal processing unit 97 into an analog signal, converts the frequency of the converted analog signal into a radio signal, and outputs the radio signal to the circulator 92.

  The control unit 98 exchanges various information with each unit and the core network side in the radio base station apparatus 101.

  FIG. 3 is a diagram showing a random access sequence in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 3, first, radio base station apparatus 101, for example, the transmission timing and transmission frequency of a random access preamble (hereinafter also referred to as RACH preamble) described in Non-Patent Document 1, the number of usable RACH preambles. The transmission power of the RACH preamble is included in the broadcast information and transmitted to each wireless terminal device 202 (step S101).

  Next, based on the broadcast information received from the radio base station apparatus 101, the radio terminal apparatus 202 selects one of a plurality of types of RACH preambles designated by the radio base station apparatus 101 (Step S102). ), And transmits to the radio base station apparatus 101 (step S103).

  Next, the radio base station apparatus 101 detects the RACH preamble transmitted from the radio terminal apparatus 202, estimates the transmission timing shift of the radio terminal apparatus 202, and calculates a correction value for the transmission timing (step S104). ).

  Next, the radio base station apparatus 101 wirelessly transmits the calculated correction value, the detected RACH preamble number, a temporary C-RNTI (Cell Radio Network Temporary Identifier), and RACH control information indicating the timing at which the RACH message should be transmitted. It transmits to the terminal device 202 (step S105).

  Next, the wireless terminal device 202 corrects its own transmission timing based on the RACH control information received from the wireless base station device 101 (step S106).

  Next, the radio terminal apparatus 202 adds the provisional C to the RACH message including a CR-ID (content reference identifier) for detecting a RACH preamble collision with another radio terminal apparatus 202 in the radio base station apparatus 101. -Transmit to the radio base station apparatus 101 with RNTI. In transmitting this RACH message, for example, HARQ (Hybrid Automatic Repeat Request) is used (step S107).

  Next, the radio base station apparatus 101 receives the RACH message from the radio terminal apparatus 202, and processing according to the upper layer such as registration processing of the radio terminal apparatus 202 is executed (step S108).

  Next, the radio base station apparatus 101 transmits RACH response information including the CR-ID received from the radio terminal apparatus 202, the official C-RNTI, and the like to the radio terminal apparatus 202 (step S109).

  Through the processing as described above, the random access sequence between the wireless terminal device 202 and the wireless base station device 101 is completed.

[Task]
FIG. 4 is a diagram illustrating an example of base station arrangement in the wireless communication system according to the first embodiment of the present invention. FIG. 5 is a diagram illustrating an example of RACH resource collision in the wireless communication system according to the first embodiment of the present invention.

  4 and 5, when the RACH parameters of each radio base station apparatus 101 in radio communication system 301, for example, the RACH preamble transmission timing and transmission frequency are appropriately set, RACH resource collision occurs, that is, temporally. In addition, there is a case where interference occurs due to frequency overlap.

  In the example shown in FIG. 5, there is a collision between the RACH resource of the macro base station 201 and the RACH resource of the femto base station 101B, and interference of the RACH preamble occurs between these base stations.

  Therefore, the wireless communication system according to the first embodiment of the present invention solves the above problem by the following configuration and operation.

[Configuration and operation]
FIG. 6 is a diagram illustrating a configuration of a control unit in the radio base station apparatus according to the first embodiment of the present invention.

  Referring to FIG. 6, control unit 98 includes a random access information acquisition unit 11, a random access setting unit 12, and a broadcast information reception unit 13.

  The random access information acquisition unit 11 acquires the setting information of the peripheral base station that is the radio base station apparatus 101 around the radio base station apparatus 101 for the setting information of the random access signal. For example, the random access information acquisition unit 11 acquires the setting information of the radio base station apparatus 101 included in the neighboring base station list held by the own radio base station apparatus 101.

  Here, the random access signal is, for example, a RACH preamble, and is detected by the radio base station apparatus 101 to adjust the transmission timing from the radio terminal apparatus 202 to the radio base station apparatus 101. The radio terminal apparatus 202 is a radio base station. This signal is transmitted from the wireless terminal device 202 prior to establishing a communication connection with the device 101.

  Based on the setting information acquired by the random access information acquisition unit 11, the random access setting unit 12 performs settings related to a random access signal that the wireless terminal device 202 should transmit to its own wireless base station device 101.

  Specifically, for example, the random access information acquisition unit 11 sets information on resources used for transmission of a random access signal, for example, transmission timing and transmission frequency, designated by the neighboring base station to the wireless terminal device 202. Get as.

  The random access setting unit 12 is used to transmit a random access signal to be transmitted from the wireless terminal device 202 to the wireless base station device 101 based on the setting information acquired by the random access information acquisition unit 11. Set resources.

[Detailed operation]
Next, the operation when the radio base station apparatus according to the first embodiment of the present invention sets the RACH parameters will be described with reference to the drawings.

  FIG. 7 is a diagram illustrating an example of RACH parameter setting operation in the wireless communication system according to the first embodiment of the present invention. FIG. 8 is a diagram illustrating an example of RACH resource collision avoidance in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 7, femto base station 101B receives broadcast information transmitted from macro base station 201 and femto base stations 101A and 101C at startup or periodically. The femto base station 101B acquires RACH parameters used by the macro base station 201 and the femto base stations 101A and 101C from the received broadcast information. Then, the femto base station 101B sets its own RACH parameters, for example, the transmission timing and transmission frequency of the RACH preamble so as not to overlap with the macro base station 201 and the femto base stations 101A and 101C.

  Thereby, collision of RACH resources can be avoided and interference can be prevented. That is, as shown in FIG. 8, the femto base station 101B can set the RACH parameter that is normally set to the RACH resource position indicated by the dotted line to the position indicated by the solid line.

  The radio base station apparatus and the radio terminal apparatus in the radio communication system according to the embodiment of the present invention read and execute a program including each step of the following sequences from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  FIG. 9 is a flowchart defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention sets the RACH parameter.

  In the control unit 98 of the radio base station apparatus 101, the broadcast information receiving unit 13 receives broadcast information to the radio terminal apparatus 202 transmitted from the neighboring base stations.

  For example, the random access information acquisition unit 11 acquires setting information of neighboring base stations from the broadcast information.

  Specifically, referring to FIG. 9, first, when activated (step S1), radio base station apparatus 101 measures neighboring base stations, that is, receives broadcast information transmitted from neighboring base stations ( Step S2).

  Next, the radio base station apparatus 101 acquires the transmission timing and transmission frequency of the RACH preamble that the neighboring base station has instructed to the radio terminal apparatus 202 from the received notification information of the neighboring base station (step S3). .

  Next, the radio base station apparatus 101 sets the RACH preamble transmission timing and transmission frequency so as not to overlap with neighboring base stations (step S4).

  Next, the radio base station apparatus 101 transmits broadcast information indicating this setting content to each radio terminal apparatus 202. Thereby, transmission / reception of the RACH preamble according to the setting content is performed between itself and the wireless terminal device 202 (step S5).

  FIG. 10 is a diagram illustrating an example of RACH parameter setting operation in the wireless communication system according to the first embodiment of the present invention.

  In the control unit 98 of the radio base station apparatus 101, the random access information acquisition unit 11 acquires setting information from the neighboring base stations via a predetermined logical interface between the radio base station apparatuses 101.

  Specifically, referring to FIG. 10, macro base station 201 and femto base stations 101A, 101B, and 101C transmit and receive communication data according to a base station-base station interface that is a logical interface, for example, an X2 interface. By doing so, various information is exchanged via the X2 interface.

  The femto base station 101B exchanges RACH parameter information via the X2 interface with the macro base station 201 and the femto base stations 101A and 101C at startup or periodically. The femto base station 101B acquires RACH parameters used by the macro base station 201 and the femto base stations 101A and 101C, respectively, and transmits its own RACH parameters, for example, the transmission timing and transmission frequency of the RACH preamble, to the macro base station 201 and the femto base station. Set so as not to overlap with 101A and 101C.

  Thereby, collision of RACH resources can be avoided and interference can be prevented. That is, as shown in FIG. 8, the femto base station 101B can set the RACH parameter that is normally set to the RACH resource position indicated by the dotted line to the position indicated by the solid line.

  FIG. 11 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention sets the RACH parameter.

  Referring to FIG. 11, first, when a new base station, which is a radio base station apparatus 101 newly installed in radio communication system 301, is activated, it refers to the acquired neighboring base station list (step S11).

  Next, the new base station transmits a RACH database (DB) request to the neighboring base stations A and B registered in the neighboring list (steps S12 and S13).

  Next, the neighboring base stations A and B receive the RACH database request from the new base station, and transmit a RACH database response indicating their own RACH database to the new base station. For example, the radio base station apparatus 101 includes all information of the RACH database held by itself in the RACH database response (steps S14 and S15).

  Next, the new base station receives the RACH database from the neighboring base stations A and B (step S16), and sets its own RACH parameters, for example, the RACH preamble transmission timing and transmission frequency based on the received RACH database (step S16). Step S17).

  Next, the new base station newly creates a RACH database based on the setting contents of its own RACH parameter (step S18).

  Next, the new base station transmits a RACH database update request to the neighboring base stations A and B in order to notify the neighboring base station of its own existence. For example, the radio base station apparatus 101 includes its own cell ID and its own RACH parameter in the RACH database update request (steps S19 and S20).

  Next, the neighboring base stations A and B receive the RACH database update request from the new base station and update their own RACH database. Here, when the neighboring base stations A and B receive the RACH database update request from the radio base station apparatus 101 registered in the neighboring base station list held by themselves, the neighboring base stations A and B update their own RACH database. This can prevent the RACH database from becoming unnecessarily large (steps S21 and S22).

  Next, the neighboring base stations A and B transmit a RACH database update response to the new base station (steps S23 and S24).

  FIG. 12 is a diagram illustrating an example of a RACH database created by the radio base station apparatus according to the first embodiment of the present invention.

  Referring to FIG. 12, the RACH database is a database in which cell IDs are associated with parameters for determining RACH preamble transmission timing and transmission frequency, for example, using the cell ID of each radio base station apparatus 101 as a key.

  More specifically, the RACH database indicates the correspondence relationship between the cell ID, the head number of the resource block used for transmitting the RACH preamble, and the frame number for storing the RACH preamble. Further, the RACH database includes its own cell ID and the cell IDs of the neighboring base stations registered in the neighboring base station list.

  Specifically, for example, the RACH parameter of the radio base station apparatus 101 with the cell ID = 3 is 0_12. That is, a predetermined number of resource blocks from the 0th resource block are used for the RACH preamble, and the RACH preamble is stored in the 12th frame.

  FIG. 13 is a diagram illustrating an example of updating the RACH database created by the radio base station apparatus according to the first embodiment of the present invention.

  Referring to FIG. 13, when update for newly adding cell ID = 100 is performed in its own neighboring base station list, radio base station apparatus 101 adds cell ID = 100 to the RACH database. Then, when the radio base station apparatus 101 receives the RACH database update request from the neighboring base station with the cell ID = 100, based on the content indicated by the RACH database update request, for example, as the RACH parameter with the cell ID = 100 in the RACH database, Register 1_1.

  FIG. 14 is a diagram illustrating an example of RACH parameter setting operation in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 14, not only the configuration in which radio base station apparatus 101 adjusts its own RACH parameter, but the administrator side adjusts the RACH parameter of each radio base station apparatus 101 using a host apparatus or a gateway apparatus. For example, the transmission timing and transmission frequency of the RACH preamble of the femto base station 101B are set so as not to overlap with the macro base station 201 and the femto base stations 101A and 101C.

  Thereby, collision of RACH resources can be avoided and interference can be prevented. That is, as shown in FIG. 8, the femto base station 101B can set the RACH parameter that is normally set to the RACH resource position indicated by the dotted line to the position indicated by the solid line.

  For example, the host apparatus or the gateway apparatus adjusts the RACH parameters within a group of radio base station apparatuses 101 existing in a nearby area, such as being registered in the neighboring base station list, instead of all of the subordinate radio base station apparatuses 101. To do.

  FIG. 15 is a sequence diagram defining an example of a RACH parameter setting sequence in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 15, first, a new base station, which is a radio base station apparatus 101 newly installed in radio communication system 301, transmits a RACH parameter request to gateway apparatus 203 at startup or periodically (step). S31).

  Next, the gateway device 203 receives the RACH parameter request from the new base station, and determines RACH parameters such as RACH preamble transmission timing and transmission frequency that do not cause a RACH resource collision with other neighboring base stations. (Step S32).

  Next, the gateway device 203 updates the RACH database using the determined RACH parameters as the RACH parameters of the new base station (step S33).

  Next, the gateway device 203 transmits a RACH parameter response indicating the determined RACH parameter to the new base station (step S34).

  Next, the new base station sets its own RACH parameter based on the content indicated by the RACH parameter response received from the gateway device 203 (step S35), and transmits a RACH setting completion notification to the gateway device 203 (step S36). ).

  By the way, a femto base station or a pico base station is often arranged unplanned compared to a macro base station, and the start and stop are dynamically controlled according to increase or decrease of communication load in a communication system. There is also. For this reason, optimal parameter settings regarding RACH, such as transmission timing and transmission power, are not constant and may change. If the RACH parameter setting is not appropriate, the wireless terminal device cannot establish a communication connection with the wireless base station device, a delay occurs in establishing the communication connection, and a delay occurs in the handover operation of the wireless terminal device Various problems arise.

  In addition, if the operator sets the RACH parameters for each femto base station when installing the femto base station, considerable work and cost are required. Further, every time a femto base station is newly installed and the number of femto base stations is increased, not only newly installed femto base stations but also existing surrounding femto base stations must be reset.

  On the other hand, in the radio base station apparatus according to the first embodiment of the present invention, the random access information acquisition unit 11 uses the periphery of its own radio base station apparatus 101 for setting information of a random access signal, for example, the RACH preamble. Get base station setting information. Then, based on the setting information acquired by the random access information acquisition unit 11, the random access setting unit 12 performs settings related to a random access signal to be transmitted from the wireless terminal device 202 to the own wireless base station device 101.

  As described above, the configuration for performing the setting related to the random access signal of the own radio base station apparatus 101 based on the setting information of the random access signal in the neighboring base station allows the optimum setting according to the installation environment of the radio base station apparatus 101 to be performed. Can be done.

  Therefore, the radio base station apparatus according to the first embodiment of the present invention can construct a good communication system by appropriately setting the random access signal.

  In addition, since the parameters related to the RACH of femto base stations and pico base stations that are often installed unplanned can be automatically set, CAPEX (Capital Expenditure), that is, the cost required for arrangement of radio base station apparatuses, and OPEX (Operational Expenditure), that is, the cost for operating the radio base station apparatus can be reduced.

  Also, in the radio base station apparatus according to the first embodiment of the present invention, the broadcast information receiving unit 13 receives broadcast information for the radio terminal apparatus 202 transmitted from the neighboring base stations. And the random access information acquisition part 11 acquires the setting information of a periphery base station from the said alerting | reporting information.

  Thus, by using the broadcast information transmitted by the neighboring base stations, for example, the setting information of the neighboring base stations can be acquired by simple processing without transmitting / receiving special information between the radio base station apparatuses 101, for example. Can do.

  Moreover, in the radio base station apparatus according to the first embodiment of the present invention, the random access information acquisition unit 11 acquires setting information from the neighboring base stations via a predetermined logical interface between the radio base station apparatuses 101. .

  As described above, the configuration using the logical interface between the radio base station apparatuses 101 allows the peripheral information to be transmitted in a simple process without receiving and analyzing, for example, broadcast information transmitted from the neighboring base stations by the radio base station apparatus 101. The setting information of the base station can be acquired.

  Further, in the radio base station apparatus according to the first embodiment of the present invention, the random access information acquisition unit 11 is used for transmission of a random access signal specified by the neighboring base station to the radio terminal apparatus 202. Get resource information as setting information. The random access setting unit 12 is used to transmit a random access signal to be transmitted from the wireless terminal device 202 to the wireless base station device 101 based on the setting information acquired by the random access information acquisition unit 11. Set resources.

  With such a configuration, it is possible to prevent the random access signal transmission timing, transmission frequency, and the like from being duplicated between the radio base station apparatuses 101, thereby improving the detection characteristics of the random access signal and constructing a good communication system. can do.

  Further, in the radio base station apparatus according to the first embodiment of the present invention, the random access information acquisition unit 11 includes the radio base station apparatus 101 included in the neighboring base station list held by its own radio base station apparatus 101. Get configuration information.

  With such a configuration, it is possible to recognize an appropriate radio base station apparatus 101 as a setting information acquisition target, and thus it is possible to efficiently acquire setting information.

  In the radio communication system according to the first embodiment of the present invention, radio base station apparatus 101 operates as a random access control apparatus. In other words, the radio base station apparatus 101 is configured to acquire the setting information of the random access signals of the neighboring base stations and perform settings related to its own random access signal. However, the present invention is not limited to this. The random access control device may be a management device for managing one or a plurality of radio base station devices 101. Specifically, a management device for managing the radio base station device 101, such as the gateway device 203 and the host device 205, is the acquisition of setting information of the random access signal of the neighboring base station and the target radio base station device 101. It may be configured to make settings related to the random access signal of the target base station.

  In this case, in the management device, the random access information acquisition unit acquires the setting information of the neighboring base station that is the radio base station device 101 around the target base station, regarding the setting information of the random access signal.

  Then, based on the setting information acquired by the random access information acquisition unit, the random access setting unit performs settings related to a random access signal that the wireless terminal device 202 should transmit to the target base station.

  With such a configuration, since the setting of the random access signal of each radio base station apparatus 101 in the radio communication system 301 can be performed collectively in the management apparatus, acquisition of setting information of the random access signal and setting related to the random access signal Can be performed more efficiently.

  On the other hand, with the configuration in which the random access control apparatus is the radio base station apparatus 101 as in the radio communication system according to the first embodiment of the present invention, the setting of the random access signal in the radio communication system 301 is set for each radio base station. Since it can be performed by the apparatus 101, it is possible to disperse the processing load for acquiring random access signal setting information and setting the random access signal.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a radio communication system that adjusts the type of RACH preamble to be used as compared with the radio communication system according to the first embodiment. The contents other than those described below are the same as those of the wireless communication system according to the first embodiment.

  FIG. 16 is a diagram illustrating an example of a preamble set in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 16, for example, in LTE, radio base station apparatus 101 determines 64 RACH preambles that can be used by radio terminal apparatus 202, and notifies each radio terminal apparatus 202 with broadcast information. Specifically, for example, the radio base station apparatus 101 notifies each radio terminal apparatus 202 only of the heads of 64 consecutive indexes called “Logical root sequence number”.

  There are a total of 838 RACH preambles, and the radio base station apparatus 101 selects 64 of these and causes the radio terminal apparatus 202 to use them.

  FIG. 17 is a diagram illustrating an erroneous communication connection process due to RACH preamble duplication in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 17, for example, in the radio communication system 301, the number of installed radio base station apparatuses 101 increases, and even if the adjustment as described in the first embodiment of the present invention is performed, the RACH preamble A case where the transmission timing and the transmission frequency overlap between the respective radio base station apparatuses 101 can be considered.

  In this case, if 64 preamble sets are also duplicated between the respective radio base station apparatuses 101, there is a possibility that the radio terminal apparatus 202 erroneously performs communication connection processing for the different radio base station apparatus 101. is there.

  That is, when the RACH preamble transmission timing and the transmission frequency overlap between the radio base station apparatuses 101, if the RACH preamble type further overlaps, the radio base station apparatus 101 transmits another radio base station The wireless terminal device 202 that transmits the RACH preamble to the station device 101 is erroneously detected as the wireless terminal device 202 that desires a communication connection with itself.

  Specifically, referring to FIG. 16 again, when the base station A uses the RACH preambles from 0 to 63 and the base station B uses the RACH preambles from 61 to 124, The 61st to 63rd RACH preambles overlap between base station A and base station B. When the wireless terminal device 202 uses these 61st to 63rd RACH preambles, both the base station A and the base station B mistakenly designate the wireless terminal device 202 as the wireless terminal device 202 that desires to connect to itself. It will be detected.

  Therefore, in the radio base station apparatus according to the second embodiment of the present invention, the random access information acquisition unit 11 designates the neighboring base station to the radio terminal apparatus 202 from among a plurality of types of random access signals. One or a plurality of types of random access signals are acquired as setting information.

  Based on the setting information acquired by the random access information acquisition unit 11, the random access setting unit 12 sets one or a plurality of types of random access signals that can be transmitted by the wireless terminal device 202 to the own wireless base station device 101. .

  FIG. 18 is a flowchart defining an example of an operation procedure when the radio base station apparatus according to the second embodiment of the present invention sets the RACH parameter.

  Referring to FIG. 18, first, when activated (step S41), radio base station apparatus 101 measures neighboring base stations, that is, receives broadcast information transmitted from neighboring base stations (step S42).

  Next, the radio base station apparatus 101 acquires the transmission timing and transmission frequency of the RACH preamble instructed by the neighboring base station to the radio terminal apparatus 202 from the received notification information of the neighboring base station (step S43). .

  Next, radio base station apparatus 101 determines whether or not it is possible to set the RACH preamble transmission timing and transmission frequency so as not to overlap with neighboring base stations (step S44).

  When the radio base station apparatus 101 can set the transmission timing and the transmission frequency so as not to overlap with the neighboring base stations (YES in step S44), the broadcast information indicating the setting contents is sent to each radio terminal apparatus 202. Send. As a result, the RACH preamble is transmitted and received according to the setting contents between itself and the wireless terminal device 202 (step S45).

  On the other hand, when the radio base station apparatus 101 cannot set the transmission timing and the transmission frequency so as not to overlap with the neighboring base stations (NO in step S44), the transmission time and the transmission frequency are set among the neighboring base stations. The RACH preamble number used by the neighboring base station is acquired from the broadcast information of the neighboring neighboring base station (step S46).

  Next, the radio base station apparatus 101 sets a RACH preamble having a number different from the RACH preamble number used by the neighboring base station as the RACH preamble used by itself (step S47).

  Next, the radio base station apparatus 101 transmits broadcast information indicating this setting content to each radio terminal apparatus 202. As a result, the RACH preamble is transmitted and received according to the set content between itself and the wireless terminal device 202 (step S48).

  FIG. 19 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the second embodiment of the present invention sets the RACH parameters.

  Referring to FIG. 19, first, when a new base station, which is a radio base station apparatus 101 newly installed in radio communication system 301, is activated, it refers to the acquired neighboring base station list (step S51).

  Next, the new base station transmits a RACH database (DB) request to the neighboring base stations A and B registered in the neighboring list (steps S52 and S53).

  Next, the neighboring base stations A and B receive the RACH database request from the new base station, and transmit a RACH database response indicating their own RACH database to the new base station. For example, the radio base station apparatus 101 includes all information of the RACH database held by itself in the RACH database response (steps S54 and S55).

  Next, the new base station receives the RACH database from the neighboring base stations A and B (step S56), and based on the received RACH database, its own RACH parameters, for example, the transmission timing and transmission frequency of the RACH preamble, and the RACH preamble. A number is set (step S57).

  Next, the new base station newly creates a RACH database based on the setting contents of its own RACH parameter (step S58).

  Next, the new base station transmits a RACH database update request to the neighboring base stations A and B in order to notify the neighboring base station of its own existence. For example, radio base station apparatus 101 includes its own cell ID and its own RACH parameter in the RACH database update request (steps S59 and S60).

  Next, the neighboring base stations A and B receive the RACH database update request from the new base station and update their own RACH database. Here, when the neighboring base stations A and B receive the RACH database update request from the radio base station apparatus 101 registered in the neighboring base station list held by themselves, the neighboring base stations A and B update their own RACH database. This can prevent the RACH database from becoming unnecessarily large (step S61 and step S62).

  Next, the neighboring base stations A and B transmit a RACH database update response to the new base station (step S63 and step S64).

  FIG. 20 is a diagram illustrating an example of a RACH database created by the radio base station device according to the second embodiment of the present invention.

  Referring to FIG. 20, the RACH database associates, for example, cell IDs, parameters for determining RACH preamble transmission timing and transmission frequency, and RACH preamble numbers with the cell ID of each radio base station apparatus 101 as a key. Database.

  More specifically, the RACH database indicates a correspondence relationship between the cell ID, the head number of a resource block used for RACH preamble transmission, the frame number storing the RACH preamble, and the RACH preamble number. Further, the RACH database includes its own cell ID and the cell IDs of the neighboring base stations registered in the neighboring base station list.

  Specifically, for example, the RACH parameter of the radio base station apparatus 101 with the cell ID = 3 is 0_12. That is, a predetermined number of resource blocks from the 0th resource block are used for the RACH preamble, and the RACH preamble is stored in the 12th frame. Also, the RACH preamble number designated by the radio base station apparatus 101 with the cell ID = 3 to the radio terminal apparatus 202 is 0-63.

  FIG. 21 is a sequence diagram defining an example of a RACH parameter setting sequence in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 21, first, a new base station, which is radio base station apparatus 101 newly installed in radio communication system 301, transmits a RACH parameter request to gateway apparatus 203 at startup or periodically (step). S71).

  Next, the gateway device 203 receives the RACH parameter request from the new base station, and RACH parameters such that the RACH resource does not collide with other neighboring base stations, for example, the transmission timing and transmission frequency of the RACH preamble, and The RACH preamble number is determined (step S72).

  Next, the gateway device 203 updates the RACH database using the determined RACH parameters as the RACH parameters of the new base station (step S73).

  Next, the gateway device 203 transmits a RACH parameter response indicating the determined RACH parameter to the new base station (step S74).

  Next, the new base station sets its own RACH parameter based on the content indicated by the RACH parameter response received from the gateway device 203 (step S75), and transmits a RACH setting completion notification to the gateway device 203 (step S76). ).

  As described above, in the radio base station apparatus according to the second embodiment of the present invention, the random access information acquisition unit 11 allows the neighboring base station to contact the radio terminal apparatus 202 from a plurality of types of random access signals. One or more types of specified random access signals are acquired as setting information. Based on the setting information acquired by the random access information acquisition unit 11, the random access setting unit 12 transmits one or more types of random access signals that can be transmitted by the wireless terminal device 202 to the wireless base station device 101. Set.

  In this way, by setting the type of the RACH preamble of its own radio base station apparatus 101 based on the type of RACH preamble in the surrounding base station, optimal setting according to the installation environment of the radio base station apparatus 101 is performed. Can do. That is, since it is possible to prevent the same type of random access signal from being used between the radio base station apparatuses 101, it is possible to improve the detection characteristics of the random access signal and construct a good communication system.

  Therefore, in the radio base station apparatus according to the second embodiment of the present invention, similarly to the radio base station apparatus according to the first embodiment of the present invention, by appropriately setting the random access signal, A good communication system can be constructed.

  In addition, since the parameters related to the RACH of femto base stations and pico base stations that are often installed unplanned can be automatically set, CAPEX (Capital Expenditure), that is, the cost required for arrangement of radio base station apparatuses, and OPEX (Operational Expenditure), that is, the cost for operating the radio base station apparatus can be reduced.

  Further, the number of installed radio base station apparatuses 101 increases, and even when the adjustment described in the first embodiment of the present invention is performed, the transmission timing and the transmission frequency of the RACH preamble are different between the radio base station apparatuses 101. In the case of duplication, it is possible to prevent erroneous communication connection processing between the radio terminal apparatus 202 and the radio base station apparatus 101 by preventing duplication of the RACH preamble type.

  Since other configurations and operations are the same as those of the wireless communication system according to the first embodiment, detailed description thereof will not be repeated here.

  Radio base station apparatus 101 is not limited to a combination of RACH preamble transmission timing and transmission frequency collision avoidance and RACH preamble number collision avoidance, and may be configured to independently perform RACH preamble number collision avoidance. Good.

  The above embodiment 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 description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 11 Random access information acquisition part 12 Random access setting part 13 Broadcast information receiving part 91 Antenna 92 Circulator 93 Wireless receiving part 94 Wireless transmission part 95 Signal processing part 96 Reception signal processing part 97 Transmission signal processing part 98 Control part 101 Wireless base station apparatus 101A, 101B, 101C Femto base station 101D Pico base station 201 Macro base station 202 Wireless terminal device 203 Gateway device 204 Core network 205 Host device 301 Wireless communication system

Claims (9)

Detected by the radio base station apparatus to adjust the transmission timing from the radio terminal apparatus to the radio base station apparatus, and before the radio terminal apparatus establishes a communication connection with the radio base station apparatus, the radio terminal Random access information acquisition for acquiring the setting information of the peripheral base station that is a radio base station device around the target base station that is the target radio base station device, regarding the setting information of the random access signal transmitted from the device And
Random access control comprising: a random access setting unit for performing settings related to the random access signal to be transmitted by the wireless terminal device to the target base station based on the setting information acquired by the random access information acquiring unit apparatus. The random access control device further includes a notification information receiving unit for receiving notification information to the wireless terminal device transmitted from the neighboring base station,
The random access control device according to claim 1, wherein the random access information acquisition unit acquires the setting information of the neighboring base station from the broadcast information.   The random access control device according to claim 1 or 2, wherein the random access information acquisition unit acquires the setting information from the neighboring base stations via a predetermined logical interface between the radio base station devices. The random access information acquisition unit acquires, as the setting information, information on resources used for transmission of the random access signal specified by the neighboring base station for a wireless terminal device,
The random access setting unit sets a resource used for transmission of the random access signal to be transmitted by the wireless terminal device to the target base station based on the setting information acquired by the random access information acquisition unit. The random access control device according to any one of claims 1 to 3. The random access information acquisition unit acquires, as the setting information, one or more types of random access signals specified by the neighboring base station for a wireless terminal device from among a plurality of types of random access signals.
The random access setting unit sets one or a plurality of types of the random access signals that can be transmitted by a wireless terminal device to the target base station, based on the setting information acquired by the random access information acquisition unit. The random access control device according to any one of claims 1 to 4.   A radio base station apparatus comprising the random access control apparatus according to claim 1.   The radio base station apparatus according to claim 6, wherein the random access information acquisition unit acquires the setting information of the radio base station apparatus included in a neighboring base station list held by the own radio base station apparatus.   A management apparatus that manages one or a plurality of radio base station apparatuses and includes the random access control apparatus according to claim 1. A random access control program used in a random access control device, the computer,
Detected by the radio base station apparatus to adjust the transmission timing from the radio terminal apparatus to the radio base station apparatus, and before the radio terminal apparatus establishes a communication connection with the radio base station apparatus, the radio terminal For the setting information of a random access signal transmitted from the device, obtaining the setting information of the peripheral base station that is a radio base station device around the target base station that is the target radio base station device;
A random access control program for executing a setting relating to the random access signal to be transmitted by the wireless terminal device to the target base station based on the acquired setting information.

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