Patent Publication Number: US-2023155767-A1

Title: Communication apparatus, management apparatus, control method, and storage medium

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a technique to adjust interference among a plurality of wireless communication systems. 
     Description of the Related Art 
     Recent years have witnessed the advancement of institutionalization for allowing companies other than carriers to construct and operate cellular cornmunica.tion networks, such as local 5G, which uses the fifth-generation (5G) cellular communication standards, and local BWA (Broadband Wireless Access) Also, for a use case in which the location of the occurrence of communication traffic changes depending on the season, there has been consideration on relocating and operating wireless base stations in accordance with the location of the occurrence of that traffic in local 5G. In a case where a wireless base station is to be relocated, it is important to suppress inter-area interference caused by overlapping of a frequency channel used by this wireless base station and a frequency channel used by another existing wireless base station. Japanese Patent Laid-Open No. 2003-250177 describes a method in which, to suppress such interference, a control station connected to a core network performs mediation so that radio channels respectively used by a wireless base station to be moved and another wireless base station that is situated at the move destination differ from each other. 
     According to the invention described in Japanese Patent Laid-Open No. 2003-250177, interference can be suppressed in a case where a wireless base station is moved inside a wireless communication system developed by one network company. Meanwhile, in a wireless communication system that uses local 5G, it is expected that a system operated by a first operating agency be developed adjacent to a system operated by a second operating agency that is different from the first operating agency. The invention described in Japanese Patent Laid-Open No. 2003-250177 cannot suppress interference between such systems with different operating agencies. 
     SUMMARY OF THE INVENTION 
     The present invention provides a technique that enables control to suppress interference among a plurality of wireless communication systems. 
     According to one aspect of the present invention, there is provided a communication apparatus, comprising: one or more processors; and one or more memories that store computer-readable instructions for causing, when executed by the one or more processors, the communication apparatus to perform a method, wherein the method comprises: detecting a signal transmitted from a first base station in another wireless communication system that is different from a wireless communication system to which the communication apparatus belongs; and transmitting first information and second information to a management apparatus that manages communication in the other wireless communication system, the first information being related to the first base station, the second information indicating a radio channel to be used in a case where communication involving user data is performed with a second base station belonging to the wireless communication system when the communication apparatus has detected the signal. 
     According to another aspect of the present invention, there is provided a management apparatus, comprising: one or more processors; and one or more memories that store computer-readable instructions for causing, when executed by the one or more processors, the management apparatus to perform a method, wherein the method comprises: obtaining first information from a communication apparatus connected to a base station managed by the management apparatus in a case where the communication apparatus has detected a signal transmitted from another base station in another wireless communication system that is different from a wireless communication system to which the management apparatus belongs, the first information being related to the other base station; and transmitting the first information and second information to another management apparatus that manages communication in the other wireless communication system, the second information indicating a radio channel to be used in a case where communication involving user data is performed with the base station when the communication apparatus has detected the signal. 
     Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram showing exemplary configurations of wireless communication systems. 
         FIG.  2    is a diagram showing exemplary components of a communication apparatus. 
         FIG.  3    is a diagram for describing an oven&#39;iew of processing executed in the wireless communication systems. 
         FIG.  4    is a diagram showing an exemplary flow of processing executed in the wireless communication systems 
         FIG.  5 A  and  FIG.  5 B  are diagrams showing exemplary configurations of a paging signal and an announcement 
         FIG.  6    is a diagram showing an exemplary configuration of a message at the time when a communication apparatus notifies a base station of a measurement result. 
         FIG.  7    is a diagram showing an exemplary configuration of a message at the time when a base station transfers a measurement result to a wireless management apparatus. 
         FIG.  8    is a diagram showing an exemplary flow of processing executed by a communication apparatus, 
         FIG.  9    is a diagram showing an exemplary flow of processing executed by a base station. 
         FIG.  10    is a diagram showing an exemplary flow of processing executed by a wireless network management apparatus. 
         FIG.  11    is a diagram fix describing an overview of processing executed in the wireless communication systems. 
         FIG.  12    is a diagram showing an exemplary flow of processing executed in the wireless communication systems. 
         FIG.  13 A  to  FIG.  13 D  are diagrams showing exemplary configurations of messages that are transmitted/received in the wireless communication systems. 
         FIG.  14    is a diagram showing an exemplary flow of processing executed by a communication apparatus. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, embodiments will be described in detail with reference to the attached drawings. Note, the following embodiments are not intended to limit the scope of the claimed invention. Multiple features are described in the embodiments, but limitation is not made to an invention that requires all such features, and multiple such features may be combined as appropriate. Furthermore, in the attached drawings, the same reference numerals are given to the same or similar configurations, and redundant description thereof is omitted. 
     (System Configuration) 
       FIG.  1    shows exemplary configurations of wireless communication systems according to the present embodiment. It is assumed that in  FIG.  1   , for example, a first region  100  indicated by a solid line is owned by a first owner, whereas a second region  110  indicated by a dash line is owned by a second owner. It is also assumed that a first wireless communication system is operated so as to cover a part of the first region  100 , and a second wireless communication system is operated so as to cover at least a part (in  FIG.  1   , all) of the second region  110 . These first wireless communication system and second wireless communication system can be configured using, for example, local 5G that conforms with the fifth-generation (5G) cellular communication standards. Also, the first wireless communication system and the second wireless communication system can be an independent wireless communication network. Note that this is one example, and the systems may be configured using, for example, local BWA (Broadband Wireless Access). 
     The first wireless communication system includes, for example, a first wireless network management apparatus  101  that manages and controls the operations of the entire system, a base station  103  that is connected to the first wireless network management apparatus  101  to be managed and controlled, and a communication apparatus  102  that is connected to the bases station  103  to perform communication. Note, it is assumed that in the first wireless communication system, for example, a region in which a wireless communication service is provided is changed by relocating the base station  103  based on the situation concerning, for example, a schedule related to a region in which work is performed by working equipment provided with the communication apparatus  102 .  FIG.  1    indicates that the base station  103  provides the communication service in a cell  104  before relocation, and provides the communication service in a cell  105  after relocation. For example, after farming that uses the communication service has been completed in an area included in the cell  104  with use of farming equipment provided with the communication apparatus  102 , the base station  103  is relocated and the cell  105  is formed.In this way, the farming equipment provided with the communication apparatus  102  can perform farming that uses the communication service in an area included in the cell  105 , following the area included in the cell  104 . 
     Similarly to the first wireless communication system, the second wireless communication system is configured to include a second wireless network management apparatus  111  that manages and controls the operations of the entire system. It is assumed that in the second wireless communication system,a plurality of base stations  113  to  117  are fixedly installed so as to enable wireless communication throughout the entire region owned by the second owner. These plurality of base stations  113  to  117  are each connected to the second wireless network management apparatus  111 , and managed and controlled by the second wireless network management apparatus  111 . A communication apparatus  112  in the second wireless communication system connects to and communicates with one of these plurality of base stations  113  to  117 . 
     Note that the base station  103  and the base stations  113  to  117  are allodeBs in a 5G cellular communication system, whereas the communication apparatus  102  and the communication apparatus  112  are UE (User Equipment) in a 5G cellular communication system. Note that no limitation is intended by this, and the discussion about the present embodiment is applicable to any system in which a base station and a communication apparatus (terminal) communicate with each other. 
     Here, in  FIG.  1   , the cell  104  before relocation of the base station  103  in the first wireless communication system does not intersect the second region  110 . Therefore, communication by the base stations  113  to  117  in the second wireless communication system, which is intended to cover the second region  110 , does not interfere with communication by the base station  103  in the first wireless communication system. On the other hand, the cell  105  after relocation of the base station  103  intersects the second region  110 , which can bring about a state where communication by the base station  113  and communication by the base station  103  interfere with each other. For example, if the frequency and the temporal resource used by the base station  103  in transmission of data to the communication apparatus  102  overlap the frequency and the temporal resource used by the base station  113  in transmission of data to the communication apparatus  112 , signal components in these overlapping portions interfere with each other. Such interference can cause such influences as a decrease in communication throughput in the communication apparatus  102  and the communication apparatus  112  and the like. 
     The present embodiment provides a method for suppressing the occurrence of such interference. Specifically, for example, in a case where the communication apparatus  112  has detected radio waves that have arrived from the base station  103 , the result of this detection is shared by both of the first wireless network management apparatus  101  in the first wireless communication system and the second wireless network management apparatus  111  in the second wireless communication system. Then, the first wireless network management apparatus  101  and the second wireless network management apparatus  111  perform control so that, for example, the base station  103  and the base station  113  perform communication using different radio channels (frequency ranges and time ranges). Note that this communication may be communication of a downlink (a link of a direction from the base station to the communication apparatus), may be communication of an uplink (a link of a direction from the communication apparatus to the base station), or may be communication of both. By sharing the foregoing information, the first wireless network management apparatus  101  and the second wireless network management apparatus  111  can specify that the cell  105  formed by the base station  103  and the cell formed by the base station  11 : 3  are in a neighbor cell relation. Therefore, radio channels used in the cells that are in the neighbor relation are adjusted; in other cells, radio channels can be used flexibly without making such an adjustment. 
     (Components of Communication Apparatus) 
       FIG.  2    shows exemplary components of the communication apparatus  112  according to the present embodiment. The communication apparatus  112  includes, for example, a CPU  201 , an output unit  202 , an operation unit  203 , a nonvolatile storage unit  204 , a SIM function unit  205 , a power source unit  206 , a RAM  207 , and a ROM  208 . 
     The CPU  201  is a central processing unit for controlling the entirety of the communication apparatus  112 . Nate that the CPU  201  is one example of processors; another processor, such as an MPU (microprocessor unit) and a multi-core processor, may be used, and a plurality of such processors may be used in combination as necessary. That is to say, the communication apparatus  112  can include one or more processors. Note that the communication apparatus  112  may include a processing circuit, such as an FPGA (field-programmable gate array), a DSP (digital signal processor), and an ASIC (application-specific integrated circuit), in addition to or in place of the foregoing. The output unit  202  is configured to include devices capable of outputting information, such as a displaying apparatus (e.g., a display), a speaker, and an oscillator. The output unit  202  presents, to a user, information obtained as a result of processing executed by the CPU  201  by, for example, causing the display to display a screen, causing the speaker to output sound, and causing the oscillator to oscillate. The operation unit  203  is configured to include devices capable of accepting a user operation, such as buttons, a keyboard, and a touch panel. In a case where the operation unit  203  has accepted a user operation, it outputs an electrical signal corresponding to the content of this operation to the CPU  201 . Note that a device that functions as both of the output unit  202  and the operation unit  203 , such as a touch panel display and the like, may be used. 
     The nonvolatile storage unit  204  is composed of a nonvolatile storage apparatus for storing information that is intended to be continuously held even after the power source of the communication apparatus  112  is turned OFF. The SIM function unit  205  executes the functions of a SIM (subscriber identification module) on the communication apparatus  112 . For example, when a SIM card has been inserted into a SIM card slot, the SIM function unit  205  enables connection to a wireless communication network with use of information stored in this SIM card. Note that the SIM function unit  205  may be an apparatus on which a built-in SIM is mounted, and can enable connection to a wireless communication network by executing processing for, for example, registering and activating SIM information provided by an operating agency that provides this network. The power source unit  206  is, for example, a battery, and has a function of supplying power to the communication apparatus  112 . The RAM  207  is a random-access memory, and can function as a working memory when, for example, the CPU  201  executes a program stored in the ROM  208 . Furthermore. the RAM  207  can also be used to, for example, store temporary information, such as parameters related to communication. The ROM  208  is a read-only memory, and is configured to store, for example, a computer program that is intended to be executed by the communication apparatus  112 , and instruction codes that can be executed by a computer. 
     Also, the communication apparatus  112  has a wireless communication function for communicating with the base stations  113  to  117 . This wireless communication function is configured to include, for example, a baseband processor, an RE (radio frequency) chip, an antenna, and the like. In a cellular communication network based on Long-Term Evolution (LTE) or 5G, C-Plane communication for transmitting/receiving control data, as well as U-Plane communication for transmitting/receiving user data, is performed between a base station and a communication apparatus by way of the foregoing wireless communication function. Note that the C-Plane and the U-Plane are also referred to as a control plane and a user plane, respectively. The communication apparatus  112  includes a U-Plane communication unit  209  for U-Plane communication and a C-Plane communication unit  210  for C-Plane communication, which operate in conformity with, for example, the 5G cellular communication standards. Note that although the U-Plane communication unit  209  and the C-Plane communication unit  210  are illustrated separately in  FIG.  2    for the sake of convenience, it is sufficient that C-Plane communication and U-Plane communication are logically separated from each other, and physically, the communication units can be mounted as one communication apparatus. Also, the communication apparatus  112  includes a radio channel information storage unit  211  that stores, for example, information of a radio channel for U-Plane communication, which has been assigned to the communication apparatus  112  by the second wireless network management apparatus  111 . Furthermore, the communication apparatus  112  includes another system information storage unit  212  that stores identification information about base stations in another wireless communication system that is different from the wireless communication system to which the communication apparatus  112  belongs, which has been detected by analyzing radio signals that have arrived. The radio channel information storage unit  211  and the other system information storage unit  212  can be implemented using, for example, physical storage apparatuses, such as memories, HDDs (hard disk drives), and SSDs (solid-state drives). Note that the radio channel information storage unit  211  and the other system information storage unit  212  may be implemented using discrete storage apparatuses, or may be implemented using one physical storage apparatus. 
     Note that the components of  FIG.  2    are examples, and the communication apparatus  112  can naturally include other components. For example, the communication apparatus  112  can include general components for executing functions as a terminal apparatus in a cellular communication system, and further components for executing a specific application. Furthermore, a part of the components of  FIG.  2    may be omitted, and two or more function blocks may be realized as one function block. 
     (Flow of Processing) 
     Next, a description is given of an exemplary flow of processing executed in the present embodiment. 
     &lt;Processing Example 1&gt; 
       FIG.  3    is a diagram showing an overview of a flow of processing in a first processing example. As shown in  FIG.  3   , the first wireless network management apparatus  101  shown in  FIG.  1    includes an assignment control unit  301  that assigns a radio channel to be used for U-Plane communication in a base station in the first wireless communication system. The first wireless network management apparatus  101  also includes a database  302  that stores, for each base station in the first wireless communication system, a radio channel being used for U-Plane communication, and a database  303  of the positions of installation thereof. Similarly, the second wireless network management apparatus  111  includes an assignment control unit  311 , a database  312  that stores, for each base station in the second wireless communication system, a radio channel being used for U-Plane communication, and a database  313  of the positions of installation thereof. The first wireless network management apparatus  101  and the second wireless network management apparatus  111  are configured in such a manner that they can communicate with each other via a WAN (wide area network), and the addresses of these wireless network management apparatuses are held and managed by an address management server  321 . Note that the address management server  321  may be, for example, a server in the network, or may be included inside each wireless network management apparatus. 
     In the present processing, in a case where the communication apparatus  112  has detected an announcement signal  351  from the base station  103  in the first wireless communication system that is different from the system to which the self-apparatus belongs, the first wireless network management apparatus  101  in the first wireless communication system is notified of the detection. For example, the communication apparatus  112  obtains identification information of the base station  103  from this announcement signal  351 , and transmits a notification including this identification information to the base station  113  in a case where this identification information is not identification information that belongs to the second wireless communication system. This notification can be provided via, for example, a UE Information Indication message  352 . Upon receiving this notification, the base station  113  provides the second wireless network management apparatus  111  with a notification indicating that the communication apparatus  112  has detected the signal of another system. This notification is provided using, for example, a Neighbor Cell Relations Report message  353 . Then, the second wireless network management apparatus  111  provides a similar notification to the first wireless network management apparatus  101  in the first wireless communication system to which the base station  103 , which is the transmission source of the signal detected by the communication apparatus  112 , belongs. This notification is also provided using, for example, a Neighbor Cell Relations Report message  354 . Then, the first wireless network management apparatus  101  sets a radio channel to be used in the base station  103  through the assignment control unit  301  based on this notification, and notifies the base station  103  of this selling. Also, the first wireless network management apparatus  101  notifies the base station  103  of the existence of the cell formed by the base station  113  in the second wireless communication system as a neighbor cell of the base station  103 . This notification can be provided via an Update Neighbor Cell Relations message  355 . Also, the second wireless network management apparatus  111  notifies the base station  113  of the existence of the cell formed by the base station  103  as a neighbor cell via an Update Neighbor Cell Relations message  356 . 
       FIG.  4    shows an exemplary flow of this procedure. Initially, the communication apparatus  112  is situated in the cell formed by the base station  113 ; for example, in a case where it has received a paging signal (step S 401 ), it can establish connection with the base station  113  and receive user data in a downlink. At this time,the paging signal is configured as shown in  FIG.  5 A ; from which base station (cell) the signal has been received is indicated by a PLMN-ID and an ECI associated with that base station (cell). Note that PLMN-ID stands for Public Land Mobile Network Identifier. Also. ECI denotes a cell identifier of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN Cell ID). The communication apparatus  112  can execute connection establishment processing based on the paging signal,which includes the PLMN-ID of the wireless communication system to which the transmission source of the paging signal belongs. Note that although  FIG.  4    shows an exemplary case where the paging signal has been transmitted from the base station  113  as one example, various signals are transmitted from the base station  113 , and the communication apparatus  112  can receive these signals. 
     It is assumed here that the position of installation of the base station  103  in the first wireless communication system has been changed (step S 402 ), and a state where the cell  104  was formed has changed to a state where the cell  105  is formed, for example. In this state, an announcement signal from the base station  103  can arrive at the communication apparatus  112  (step S 403 ). Upon detecting this announcement signal, the communication apparatus  112  analyzes the content thereof, and specifies that the announcement signal has arrived from the base station  103  in a system that is different from the second wireless communication system to which the self-apparatus belongs. Note that the announcement signal is configured as shown in  FIG.  5 B ; based on the PLMN-ID and ECI, the communication apparatus  112  can specify that the announcement signal is a signal that has arrived from a base station in a system that is different from the second wireless communication system. Note that although the description here concerns a case where the announcement signal has arrived at the communication apparatus  112 , no limitation is intended by this. For example, in case of arrival of no particular signal with which a base station acting as a source of this signal can ne specified, such as a paging signal, the communication apparatus  112  can specify whether the transmission source of this signal is the base station in the second wireless communication system to which the self-apparatus belongs. Note that the communication apparatus  112  may analyze not only a broadcast signal such as an announcement signal and a paging signal, but also a control information portion and the like of an individual signal, to specify whether the transmission source of this signal is the base station in the second wireless communication system to which the self-apparatus belongs, 
     Furthermore, although the foregoing has been described in relation to a case where the combination of the PLMN-ID and ECI included in a signal serves as the basis for specifying to which system the base station acting as the transmission source of this signal belongs, no limitation is intended by this. In a case where the system can be specified using only the PLMN-ID or only the ECI, it is sufficient to refer only to information that is necessary for the specification. Also, in a case where the system can be specified using information different from the PLMN-ID and ECI, the PLMN-ID and ECI may not be used in specifying the system. Note that, here, the communication apparatus  112  may determine whether a signal is from the base station that has been notified by the base station  113  in advance as a neighbor cell based on such information as the PLMN-ID and ECI. That is to say, the communication apparatus  112  may determine whether a signal has arrived from a cell which has not been registered with the base station  113  as a neighbor cell, and of which the communication apparatus  112  has not been notified as a neighbor cell. For example, in a case where the communication apparatus  112  has detected a signal of a cell that has not been registered with the base station  113  as a neighbor cell, it can analyze whether this signal is a signal of a system that is different from the wireless communication system to which the self-apparatus belongs. Furthermore, in a case where the communication apparatus  112  has detected a signal of a cell that has not been registered with the base station  113  as a neighbor cell, it may determine that this signal is a signal of a system that is different from the wireless communication system to which the self-apparatus belongs. 
     The communication apparatus  112  determines that a signal has arrived from a system that is different from the second wireless communication system to which the self-apparatus belongs in the foregoing manner, and transmits a UE Information indication message to the base station  113  (step S 404 ). Here, an exemplary configuration of the UE Information Indication message is shown in  FIG.  6   . The UE Information Indication message includes information  601  indicating that a notification about measured information is to be provided, as well as measurement results  602  and  608  related to one or more cells. Note that in a case where, for example, the communication apparatus  112  has been instructed by the base station  113  to report the result of measurement of a surrounding environment, it can report the information  601  to the base station  113 . Note that this measurement of the surrounding environment may be performed in an unconnected state (e.g., an RRC_Idle state or an RRC_Inactive state), or may be performed in a connected state (an RRC_Connected state). Note that RRC refers to radio resource control. The measurement result of each cell includes a physical cell identifier  603  of that cell, a carrier frequency  604 , RSSI information  605  indicating a received signal strength indicator, radio channel information  606  used in U-Plane communication, and detected base station information  607  indicating a detected base station. Note that these are examples, and it is sufficient to include at least information related to a base station in another system that has been detected (the detected base station information  607  in  FIG.  6   ). Other pieces of information may be options. For example, the base station  113  can be notified of the radio channel information  606  for the purpose of adjusting a. radio channel used for U-Plane communication in the base station  113 . Note that regarding this information, for example, the second wireless network management apparatus  111  can obtain this information by making an inquiry to the first wireless network management apparatus  101  based on the detected base station information  607 , and thus the communication apparatus  112  may not provide a notification about this information. Similarly, regarding the physical cell identifier  603  and the carrier frequency  604  as well, they can be obtained by the second wireless network management apparatus  111  making an inquiry to the first wireless network management apparatus  101  based on the detected base station information  607 . The RSSI information  605  can indicate, for example, the extent of interference power from the cell associated with the measurement result  602  in a case where the magnitude of RSSI indicated by this information is equal to or larger than a predetermined value, resource control for interference avoidance can be performed. On the other hand, the RSSI information  605  may be omitted in a case where resource control for interference avoidance is performed, regardless of the value of RSSI, on the condition that the communication apparatus  112  has detected a signal of another system. Note that the communication apparatus  112  may provide a notification about information of a radio channel used for U-Plane communication in the self-apparatus. In this case, this information of the radio channel can be included as an item under the radio channel information  606 . In a case where the notification about the information of the radio channel used by the communication apparatus  112  is provided, this information may be stored in a different field of the UE Information Indication message, separately from the measurement results  602  and  608  related to neighbor cells. Note that as the information of the radio channel used by the communication apparatus  112  is naturally recognized by the second wireless network management apparatus  111  and the base station  113 , the communication apparatus  112  may not provide the notification about this information. In this case, for example, the base station  113  may notify the second wireless network management apparatus  111  of this information of the used radio channel. 
     Upon receiving the UE Information Indication message, the base station  113  generates a Neighbor Cell Relations Report message and notifies the second wireless network management apparatus  111  of the same (step S 405 ).  FIG.  7    shows an exemplary configuration of the Neighbor Cell Relations Report. The Neighbor Cell Relations Report includes, for example, a first field  701  that stores parameters related to the neighbor relations of the current cell, and a second field  702  that stores information notified in step S 404 . The second field  702  stores information corresponding to the radio channel information  606  and the detected base station information  607 . 
     Upon receiving the Neighbor Cell Relations Report, the second wireless network management apparatus  111  analyzes the content thereof, and determines whether information of a base station that is not under control of the self-apparatus is stored under the detected base station information  607 . Then, in a case where information of a base station that is not under control of the self-apparatus is stored, the second wireless network management apparatus  111  specifies another wireless network management apparatus (wireless communication system) corresponding to that base station. Then, the second wireless network management apparatus  111  transfers the Neighbor Cell Relations Report to the address of another wireless network management apparatus. At this time, in a case where information of the address of another wireless network management apparatus has been held in advance, the second wireless network management apparatus  111  transfers the Neighbor Cell Relations Report using that address as a destination. On the other hand, in a case where information of the address of another wireless network management apparatus has not been held in advance, the second wireless network management apparatus  111 , for example, makes an inquiry to the address management server  321  about information of that address. Then, the second wireless network management apparatus  111  transfers the Neighbor Cell Relations Report using the address obtained from the address management server  321  as a destination. In the example of  FIG.  4   , the second wireless network management apparatus  111  specifies the first wireless network management apparatus  101  based on information of the base station  103 . Then, in order to transfer the Neighbor Cell Relations Report, the second wireless network management apparatus  111  makes an inquiry to the address management server  321  about the address of the first wireless network management apparatus  101  (step S 406 ). Then, the second wireless network management apparatus  111  receives, from the address management server  321 , a response regarding the address of the first wireless network management apparatus  101  (step S 407 ). Then, the second wireless network management apparatus  111  transfers the Neighbor Cell Relations Report received in step S 405  using the address obtained in step S 407  as a destination (step S 408 ). Note that in this case, the second wireless network management apparatus  111  can transmit the Neighbor Cell Relations Report with information of the base station  113 , which is the transmission source of this report, included therein. In this way, information of neighbor cell relations can be shared among a plurality of wireless network management apparatuses of wireless communication systems (e.g., local 5G systems) that differ from one another. 
     Then, the second wireless network management apparatus  111  transmits an Update Neighbor Cell Relations message to the base station  113  to which the UE Information Indication message was transmitted by the communication apparatus  112  (step S 409 ). Based on this message, the base station  113  transmits a UE Information Response message to the communication apparatus  112  (step S 410 ). In accordance with the reception of this message, the communication apparatus  112  can recognize that the base station  113  treats the cell formed by the base station  103  as a neighbor cell. Also, in one example, the communication apparatus  112  can recognize that, in the subsequent communication, radio resources are adjusted between the base station  103  and the base station  113 . Meanwhile, based on the Neighbor Cell Relations Report, the first wireless network management apparatus  101  specifies the base station  103  in which information of neighbor cell relations is to be updated. Then, the first wireless network management apparatus  101  transmits the Update Neighbor Cell Relations message to the specified base station  103  (step S 411 ). In this way, the base station  103  can treat the cell formed by the base station  113  as a neighbor cell. 
     Next, processing executed by each apparatus will be described.  FIG.  8    shows an exemplary flow of processing executed by the communication apparatus  112 . Note that this processing can be realized by, for example, the CPU  201  executing a computer program stored in the ROM  208  or the like. 
     Upon detecting a signal, such as an announcement signal, in the aforementioned step S 401  (step S 801 ), the communication apparatus  112  determines whether this signal is a signal of the second wireless communication system to which the communication apparatus  112  itself belongs (step S 802 ). For example, the communication apparatus  112  determines whether the PLMN-ID included in the detected signal matches the PLMN-ID of the second wireless communication system to which the self-apparatus belongs, and can determine that a signal of another wireless communication system has been detected in a case where they do not match. In a case where the communication apparatus  112  has determined that it has detected a signal of the second wireless communication system to which it belongs (YES of step S 802 ), it executes normal processing related to this signal (step S 808 ), and ends processing. For example, in a case where the signal is an announcement signal, the communication apparatus  112  obtains various types of parameters included in this announcement signal, and executes processing for holding (newly registering or updating) them inside the self-apparatus. Also, in a case where the signal is a paging signal, the communication apparatus  112  determines whether the self-apparatus has been called up by this paging signal, and in a case where it has been called up, it can establish connection with the base station  113  and receive user data from the base station  113 . 
     On the other hand, in a case where the communication apparatus  112  has determined that it has detected a signal of a wireless communication system different from the second wireless communication system to which it belongs (NO of step S 802 ), it makes preparation for notifying the base station  113  of identification information of a base station included in this signal. First, for example, the communication apparatus  112  temporarily stores the combination of the PLMN-ID and ECI included in the signal as this identification information of the base station. Also, the communication apparatus  112  sets this temporarily-stored information in a field of the detected base station information  607  of the UE Information Indication message to be transmitted to the base station  113  (step S 803 ). Furthermore, for example, the communication apparatus  112  sets information indicating the radio channel used for U-Plane communication in the self-apparatus in a field of the radio channel information  606  of the UE Information indication message (step S 804 ). Then, the communication apparatus  112  transmits, to the base station  113 , the UE Information Indication message in which these parameters have been set (step S 805 ). For example, the communication apparatus  112  newly establishes connection with the base station  113  in the case of the RRC Idle state, and restarts connection with the base station  113  and transmits this message to the base station  113  in the case of the RRC Inactive state. 
     Thereafter, the communication apparatus  112  determines whether it has received a response to the UE Information Indication message (a UE Information Response message) from the base station  113  (step S 806 ). In a case where this response has not been received (NO of step S 806 ), the communication apparatus  112  directly ends processing. Note that the communication apparatus  112  may, for example, repeatedly execute the transmission of step  5305 . On the other hand, in a case where this response has been received (YES of step S 806 ), the communication apparatus  112  deletes the identification information of the base station thatt was temporarily stored (step S 807 ), and ends processing. 
       FIG.  9    shows an exemplary flow of processing executed by the base station  113 . Note that this processing can be realized by, for example, a computer provided for the base station  113  executing a computer program stored in a storage apparatus. 
     Upon receiving a UE Information Indication message from the communication apparatus  112 , the base station  113  extracts the radio channel information  606  and the detected base station information  607  therein, as well as other parameters shown in  FIG.  6   , for example. Then, based on these pieces of information, the base station  113  stores items in a parameter field (the second field  702 ) of a Neighbor Cell Relations Report (step S 901 ). Then, the base station  113  transmits this Neighbor Cell Relations Report message to the second wireless network management apparatus  111  (step S 902 ). Thereafter, the base station  113  waits for an Update Neighbor Cell Relations message from the second wireless network management apparatus  111  (step S 903 ). Upon receiving the Update Neighbor Cell Relations message (YES of step S 903 ), the base station  113  transmits a UE information Response message to the communication apparatus  112 , and ends processing (step S 904 ). Note that the Update Neighbor Cell Relations message can include, for example, information of the radio channel to be used for U-Plane communication with the communication apparatus  112 . Based on this information, the base station  113  can set the frequency channel to be used for U-Plane communication with the communication apparatus  112  and perform communication. 
       FIG.  10    shows an exemplary flow of processing executed by the second wireless network management apparatus  111 . Note that this processing can be realized by, for example, a computer provided for the second wireless network management apparatus  111  executing a computer program stored in a storage apparatus. 
     The second wireless network management apparatus  111  first receives a Neighbor Cell Relations Report message (step S 1001 ). Then, the second wireless network management apparatus  111  determines whether this message includes information of a base station of another system different from the system to which the self-apparatus belongs (step S 1002 ). Here, the second wireless network management apparatus ill determines, for example, whether the message includes detected base station information  607  with a PLMN-ID different from the PLMN-ID corresponding to its own system. In a case where the second wireless network management apparatus  111  has determined that information of a base station of another system is included (YES of step S 1002 ), it subsequently determines whether it has obtained the address of another wireless network management apparatus of the system to which the base station belongs (step S 1003 ). Here, the second wireless network management apparatus  111  can determine, for example, whether the address of another wireless network management apparatus has been held in advance. Also, for example, in a case where the address of another wireless network management apparatus has not been held or the expiration period thereof has elapsed, the second wireless network management apparatus  111  can obtain this address by transmitting an inquiry message about the same to the address management server  321 . Note that this inquiry can be made by transmitting, for example, a PLMN-ID information for specifying the wireless network management apparatus which is based on identification information of the base station (the combination of the PLMN-ID and ECI), and the like to the address management server  321 . Then, for example, in a case where the address has been successfully obtained from the address management server  321 , the second wireless network management apparatus  111  can determine that this address has been obtained; in a case where this obtainment has failed, it can be determined that the address has not been obtained. Note that in a case where there is no address management server  21 , the second wireless network management apparatus  111  may only determine whether the address of another wireless network management apparatus has been held inside the self-apparatus. Also, in this case, too, if the second wireless network management apparatus  111  has a mechanism that enables the obtainment of the address of another wireless network management apparatus, it may attempt to obtain this address with use of this mechanism and determine whether the address was actually able to be obtained. 
     In a case where the second wireless network management apparatus  111  has obtained information of this address (YES of step S 1003 ), it transfers the Neighbor Cell Relations Report message to that address (step S 1004 ). Then, the second wireless network management apparatus  111  updates Neighbor Cell Relations information in the network to which the self-apparatus belongs, and sets a status indicating a successful update (step S 1005 ). Note that also in a case where there is no identification information of a base station outside the system to which the self-apparatus belongs (NO of step S 1002 ), the second wireless network management apparatus  111  updates this Neighbor Cell Relations information and sets a status indicating a successful update (step S 1005 ). Here, for example, also in a case where information of a base station in another system that was obtained in advance has been acquired again, the second wireless network management apparatus  111  may determine NO in step S 1002  and proceed to step S 1005  in processing. On the other hand, in a case where the information of the address was not able to be obtained (NO of step S 1003 ), the second wireless network management apparatus  111  updates this Neighbor Cell Relations information and sets a status indicating a failed update (step S 1006 ). 
     After updating the Neighbor Cell Relations information, the second wireless network management apparatus  111  transmits, to the base station  113 , an Update Neighbor Cell Relations message that has been generated based on this updated information. With the Update Neighbor Cell Relations message, information of the radio channel that is intended to be used by the base station  113  for U-Plane communication is updated. 
     Meanwhile, another wireless network management apparatus (the first wireless network management apparatus  101 ) that has received the transferred Neighbor Cell Relations Report message analyzes information of this message. Then, based on the information in this message, another wireless network management apparatus updates Neighbor Cell Relations information within the wireless communication network to which the self-apparatus belongs. Note that in this case, a status indicating a successful update of the Neighbor Cell Relations information is set. Also, based on detected base station information indicated by the received Neighbor Cell Relations Report, another wireless network management apparatus specifies a base station under control which is to be adjusted in terms of the radio channel to be used for U-Plane communication. Then, another wireless network management apparatus transmits an Update Neighbor Cell Relations message to this base station specified, and updates information of the radio channel that is intended to be used by this base station for U-Plane communication. 
     As described above, in the present embodiment, the communication apparatus  112  notifies the base station  113  of detection of a signal of another system different from the wireless communication system to which the self-apparatus belongs. At this time, the communication apparatus  112  provides this notification with use of a UE Information Indication message, which has been prepared as a new control message. Note that this notification may be transmitted by the communication apparatus  112  using, for example, a dedicated radio resource without receiving an instruction from the base station  113 , or may be transmitted by the communication apparatus  112  in response to reception of an explicit or implicit instruction from the base station  113 . Also, for example, a predetermined event, such as detection of a signal of a cell different from a cell that has been notified from the base station  113  as a neighbor cell at a predetermined power level or higher, may be defined. In this case, the communication apparatus  112  can establish connection with the base station  113  and transmit a UE Information Indication message in accordance with detection of this predetermined event, irrespective of an instruction from the base station  113 . Note that the communication apparatus  112  may transmit this message as a C-Plane message, or may transmit this message as U-Plane user data or in a state where this message has been multiplexed together with the user data. Note that this message may be realized by, for example, expanding information elements of a message related to Measurement reporting of the 3GPP standards, TS 37.320. Also, for example, the content of the UE Information Indication message may be transmitted via a message that is used by the communication apparatus  112  in establishing connection with the base station  113 . For example, the communication apparatus  112  may include this content in a message 3 of a random-access procedure at the time of transition from the RRC_Idle state or the RRC Inactive to the RRC_Connected state. 
     Also, using a Neighbor Cell Relations Report, the base station  113  notifies a wireless network management apparatus in another system of information related to the detected cell. In this way, the neighbor cell relations can be shared among a plurality of networks. Also, the second wireless network management apparatus  111  can receive an Update Neighbor Cell Relations message from the first wireless network management apparatus  101 , and obtain information of the radio channel used by the base station  103  for U-Plane communication. As a result, the base station  113  can perform U-Plane communication with the communication apparatus  112  with use of a radio channel different from that of a cell in another system that is in a neighbor relation with the cell formed by the self-apparatus. Note that the base station  113  may use a radio channel that is not used by the base station  103  for communication with a communication apparatus that detected a signal of the base station  103 , and may use a radio channel that is used by the base station  103  for communication with another communication apparatus. That is to say, the radio channels used by the base station  103  and the base station  113  may be determined and set in advance, or may not be set in advance, between the first wireless network management apparatus  101  and the second wireless network management apparatus  111 . In a case where they are not set in advance, the base station  103  and the base station  113  can be respectively notified of pieces of information of the radio channels that are currently used by the base station  113  and the base station  103 , and the radio channels that are actually used can be determined by the base station  103  and the base station  113  at their own discretion. 
     Note that although the above has described an example in which a UE Information Indication message is transmitted in accordance with detection of a signal of another system by the communication apparatus  112 , this message may be transmitted regularly. When the result of measurement of the radio environment in the communication apparatus  112  is transmitted regularly, the base station  113  can predict whether a signal from the base station  103  interferes with downlink communication of the communication apparatus  112 . That is to say, the UE Information Indication message can be used to specify whether the communication apparatus  112  is present in a position that is subject to interference by a signal from the base station  103 . Then, in a case where it is predicted that the interference will occur, the base station  113  can refrain from using the radio channel used by the base station  103  during downlink communication of the communication apparatus  112 . Note that a conventional Measurement Report may be used in such control. That is to say, after the neighbor cell relations have been defined on a network side, the base station  113  can notify the communication apparatus  112  of information of the cell formed by the base station  103  as neighbor cell information, and the communication apparatus  112  can execute the measurement based on this information. Then, the base station  113  can obtain the result of this measurement and execute control for assigning radio resources. 
     Through the above-described processing, in two neighbor cells that belong to systems that are different from each other due to, for example, relocation of a base station in a local 5G wireless communication system, it is possible to avoid the use of the same radio channel at least in an area where the cells overlap. This makes it possible to prevent the occurrence of interference in these cells, or at least suppress such interference, without an operator of a wireless communication system performing an operation. 
     &lt;Processing Example 2&gt; 
       FIG.  11    is a diagram showing an overview of a flow of processing in a second processing example. The apparatus configuration of  FIG.  11    is similar to that of  FIG.  3   . In the present processing example, once the communication apparatus  112  has detected a radio signal, such as an announcement signal  1151 , from the base station  103  in another system that has been relocated and started to operate, it makes an inquiry to the address management server  321  about the address of the first wireless network management apparatus  101  in this another system. For example, based on the PLMN-ID included in the detected radio signal and the like, the communication apparatus  112  transmits a signal  1152  for making an inquiry about the address of the first wireless network management apparatus  101  to the address management server  321  via the base station  113  and the second wireless network management apparatus  111 . Then, upon receiving a. response including the address from the address management server  321 , the communication apparatus  112  transmits information  1153  related to the detected cell (e.g., the combination of the PLMN-ID and ECI related to that cell) to that address, 
     A flow of this processing is now described using  FIG.  12   . The communication apparatus  112  is situated in the cell formed by the base station  113 , and is in a state where it receives an announcement signal and a paging signal from the base station  113  (step S 1201 ). Also, it is assumed that the base station  103  has been relocated as described earlier, thereby allowing radio waves to reach as far as a part of the region of the cell formed by the base station  113  (step S 1202 ). As a result, the communication apparatus  112  detects a signal, such as an announcement signal, from the base station  103  (step S 1203 ). The communication apparatus  112  analyzes this signal, and specifies that the signal is from the first wireless communication system different from the second wireless communication system to which the self-apparatus belongs. For example, based on the PLMNAD included in the signal, the communication apparatus  112  specifies that it has detected a signal from the first wireless communication system different from the second wireless communication system to which the self-apparatus belongs. In this case, the communication apparatus  112  performs communication for making an inquiry to the address management server  321  about information related to the base station  103  (information of the first wireless network management apparatus  101  in the first wireless communication system). For example, the communication apparatus  112  sets an IP (Internet Protocol) communication path with the address management server  321  (step S 1204 ), thereby enabling the execution of IP communication with the address management server  321 . Then, the communication apparatus  112  transmits, to the address management server  321 , a message for making an inquiry about information related to the base station  103  (a Foreign Base Station Database Discovery message) (step S 1205 ). The Foreign Base Station Database Discovery message transmitted here incudes, for example, the combination of the PLAIN-ID and cell identifier ((e.g., ECI) related to the base station  103  as shown in  FIG.  13 A . Then, the communication apparatus  112  receives a response (a Foreign Base Station Database Discovery Response message) from the address management server  321  (step S 1206 ). This Foreign Base Station Database Discovery Response message includes, for example, the address of the first wireless network management apparatus  101  associated with the base station  103  as shown in  FIG.  13 B . Note that this message, too, can include the combination of the PLAN-ID and cell identifier (e.g., ECI) related to the base station  103 . This enables the communication apparatus  112  to clearly specify that the response has been made with respect to the inquiry in step S 1205 . Note that the communication apparatus  112  may issue identification information of the inquiry, transmit the message in step  51205  with this identification information included therein, and receive a response including this identification information in step S 1206 . In one example, after the completion of this inquiry, the communication apparatus  112  releases the IP communication path that was set in step S 1204  (step S 1207 ). 
     Thereafter, based on the information obtained in step S 1206 , he communication apparatus  112  performs communication for updating neighbor cell relations with the first wireless network management apparatus  101 . For example, the communication apparatus  112  enables the execution of IP communication with the first wireless network management apparatus  101  by setting an IP communication path with the first wireless network management apparatus  101  (step S 1208 ). Then, the communication apparatus  112  transmits, to the first wireless network management apparatus  101 , a Neighbor Cell Relation Update Request message for requesting an update of neighbor cell relations (step S 1209 ). For example, as shown in  FIG.  13 C , a Neighbor Cell Relation Update Request message includes information indicating the detected cell (the base station  103 ) and information of the radio channel that is currently used by the communication apparatus  112 . Based on this information, the first wireless network management apparatus  101  can update Neighbor Cell Relations information that is under control of the self-apparatus. Also, based on this information, the first wireless network management apparatus  101  can recognize that, if the base station  103  uses the radio channel that is currently used by the communication apparatus  112 , there is a possibility that interference occurs in communication of the communication apparatus  112 . For this reason, for example, the first wireless network management apparatus  101  can perform processing for, for example, changing the radio channel that is intended to be used by the base station  103  for U-Plane communication. Also, the first wireless network management apparatus  101  can, for example, notify the base station  103  of information of the radio channel that is currently used by the communication apparatus  112 , and prevent the base station  103  from using this radio channel in relation to a communication apparatus situated on the edge of the cell. Note that this notification can be provided via an Update Neighbor Cell Relations message. Also, the first wireless network management apparatus  101  provides the second wireless network management apparatus  101  with a notification indicating that, for example, the cells respectively formed by the base station  103  and the base station  113  are in a neighbor cell relation (step S 1210 ). Based on this information, the second wireless network management apparatus  111  can update  Neighbor Cell Relations information that is under control of the self-apparatus. Note that the first wireless network management apparatus  101  may notify the second wireless network management apparatus  111  of, for example, information indicating that the radio channel used by the base station  103  has been adjusted, and information indicating the radio channel that is intended to be used by the base station  113 . Also, the first wireless network management apparatus  111  may include, for example, such information as identification information of the base station  103  and the radio channel that is currently used by the communication apparatus  112 . This notification can be provided via Update Neighbor Cell Relations. 
     Also, the first wireless network management apparatus  101  transmits, to the communication apparatus  112 , information indicating that the update of neighbor cell relations has been completed (step S 1211 ). This information is transmitted via, for example, a Neighbor Cell Relations Update Response message. This Neighbor Cell Relations Update Response message includes a Result Code indicating whether the update has succeeded as shown in  FIG.  13 D , for example. Also, this message may include information of the radio channel that is currently used by the communication apparatus  112 , and identification information of the base station  103 . Note that, for example, identification information for identifying a Neighbor Cell Relations Update Request message may be added. In this case, the Neighbor Cell Relations Update Response message may include this identification information. In this way, the communication apparatus  112  can specify one of messages for which this message has been received in response. Once the update of neighbor cell relations has been completed through transmission/reception of the Neighbor Cell Relations Update Response message, the communication apparatus  112  releases the IP communication path with the first wireless network management apparatus  101  (step S 1212 ). 
       FIG.  14    shows an exemplary flow of processing executed by the communication apparatus  112 . Note that this processing can be realized by, for example, the CPU  201  executing a computer program stored in the ROM  208  or the like. 
     Upon detecting a signal, such as an announcement signal, in the aforementioned step S 1201  (step S 1401 ), the communication apparatus  112  determines whether this signal is a signal of the second wireless communication system to which the communication apparatus  112  itself belongs (step S 1402 ). This processing is similar to S 801  and S 802  of  FIG.  8   . In a case where the communication apparatus  112  has determined that it has detected a signal of the second wireless communication system to which it belongs (YES of step S 1402 ), it executes normal processing related to this signal (step S 1409 ), and ends processing. This processing of step S 1409 , too, is similar to step S 808  of  FIG.  8   . In a case where the communication apparatus  112  has determined that it has detected a signal of a system different from the second wireless communication system to which it belongs (NO of step S 1402 ), it extracts identification information of the base station  103 , which is the transmission source, from this signal and temporarily stores the same (step S 1403 ). This identification information is, for example, the combination of a PLMN-ID and an ECI. Also, the communication apparatus  112  temporarily stores information for specifying the radio channel that is currently used by the self-apparatus (step S 1404 ). 
     Then, the communication apparatus  112  makes an inquiry to the address management server  321  about the address of the first wireless network management apparatus  101  of the system to which the base station  103 , which is the transmission source of the detected signal, belongs. For example, the communication apparatus  112  transmits, to the address management server  321 , a Foreign Base Station Database Discovery message including the stored identification information of the base station  103  (step S 1405 ). Note that in a case where the address management server  321  is included in the second wireless network management apparatus  111  in the wireless communication system to which the communication apparatus  112  belongs, this message is transmitted to the second wireless network management apparatus  111 . Thereafter, the communication apparatus  112  waits for a response to arrive from the address management server  321  (step S 1406 ). Based on the identification information of the base station  103 , the address management server  321  searches for the address of the corresponding first wireless network management apparatus  101 , and transmits a response including the result of this search to the communication apparatus  112 . Here, the response can be a Foreign Base Station Database Discovery Response message, for example. In a case where this response has not been received, or in a case where the effective address of the first wireless network management apparatus  101  is not stored in the response (NO of step S 1406 ), the communication apparatus  112  directly ends processing. On the other hand, in a case where the effective address of the first wireless network management apparatus  101  has been obtained (YES of step S 1406 ), the communication apparatus  112  requests the first wireless network management apparatus  101  to, for example, update neighbor cell relations (step S 1407 ). For example, the communication apparatus  112  transmits, to the first wireless network management apparatus  101 , a Neighbor Cell Relations Update Request including the identification information of the base station  103  and information of the radio channel that is currently used by the communication apparatus  112 . Note that the message may be transmitted with identification information of the communication apparatus  112  included therein. After this request, the communication apparatus  112  can recognize that neighbor cell relations have been updated by, for example, receiving a Neighbor Cell Relations Update Response. After transmitting the Neighbor Cell Relations Update Request, the communication apparatus  112  deletes the information that was stored in step  51403  from a storage region (step S 1408 ), and ends processing. Note that the communication apparatus  112  can delete the information upon receiving the Neighbor Cell Relations Update Response message. Note that no limitation is intended by this, and the communication apparatus  112  may delete the information after transmitting the Neighbor Cell Relations Update Request message, without waiting for a response to be received. 
     Through the foregoing procedure, as the communication apparatus  112  transmits information directly to the first wireless network management apparatus  101 , the first wireless network management apparatus  101  can recognize that a signal transmitted by the base station  103 , which is under control thereof, can interfere with communication of the communication apparatus  112 . This enables the first wireless network management apparatus  101  to, for example, perform control to change the radio channel used by the base station  103 . According to this processing, in two neighbor cells belonging to systems that are different from each other, it is possible to avoid, for example, the use of the same channel. This makes it possible to prevent the occurrence of interference in these cells, or at least suppress such interference, without an operator of a wireless communication system performing an operation. 
     Note that in one example, after processing of  FIG.  12    or  FIG.  14    has been completed, the communication apparatus  112  may not repeatedly execute processing of  FIG.  12    or  FIG.  14    in a case where it has detected a signal from the same transmission source as the signal that was detected in that process. In this case, the communication apparatus  112  can, for example, notify the base station  113  of the result of measurement of a signal from the base station  103  as the result of measurement of a neighbor cell, while refraining from providing a notification to the first wireless network management apparatus  101 . In line with this notification, the base station  113  can, for example, perform communication with the communication apparatus  112  with use of a radio channel that is not used by the base station  103  in a case where the influence of interference is significant. 
     Also, although the above processing example has been described in relation to an example in which both the base station  103  and the base station  113  perform control to, for example, change the radio channel to be used, no limitation is intended by this. For example, the priorities among the systems may be set. In this case, the radio channel used by a system with low priority can be changed, whereas the radio channel used by a system with high priority can remain unchanged. 
     Note that communication between the aforementioned communication apparatus  112  and address management server  321  or first wireless network management apparatus  101  can be performed via the base station  113 . Also, this communication may be performed via the second wireless network management apparatus  111 _. In this case, for example, a Foreign Base Station Discovery message may be transmitted to the address management server  321  and the second wireless network management apparatus  111  as destinations. Similarly, a Neighbor Cell Relations Update Request message may be transmitted not only to the first wireless network management apparatus  101 , but also to the second wireless network management apparatus  111 . In this way, the second wireless network management apparatus  111  can, at the instant of reception of one of these messages, recognize that a signal from the base station  103  was detected in the communication apparatus  112 . Therefore, in this case, processing of step S 1210  can be skipped, for example. Note that communication between the communication apparatus  112  and the address management server  321  or the first wireless network management apparatus  101  may be performed without involvement of the base station  113 . For example, there may be a case where the wireless network management apparatus  101  is situated on the cell edge of the cell formed by the base station  113  and fails to communicate with the base station  113 . In this case, communication between the communication apparatus  112  and the address management server  321  or the first wireless network management apparatus  101  may be performed via, for example, another base station in the second wireless communication system, a wireless LAN, or a base station in the first Tireless communication system in some cases, among others. Information of a radio channel transmitted at this time is information of a radio channel used in a case where user data is to be communicated with the base station  113  in the second wireless communication system when a signal from the base station  103  has been detected. In this case also, similar advantageous effects can be achieved by configuring a communication path between the communication apparatus  112  and the address management server  321  or the first wireless network management apparatus  101  and transmitting/receiving information in the above-described manner. 
     The present invention can enable control to suppress interference among a plurality of wireless communication systems. 
     Other Embodiments 
     Embodiment(s) of the present invention can also be realized by a computer of a system or apparatus that reads out and executes computer executable instructions (e.g., one or more programs) recorded on a storage medium (which may also be referred to more fully as a ‘non-transitory computer-readable storage medium’) to perform the functions of one or more of the above-described embodiment(s) and/or that includes one or more circuits (e.g., application specific integrated circuit (ASIC)) for performing the functions of one or more of the above-described embodiment(s), and by a method performed by the computer of the system or apparatus by, for example, reading out and executing the computer executable instructions from the storage medium to perform the functions of one or more of the above-described embodiment(s) and/or controlling the one or more circuits to perform the functions of one or more of the above-described embodiment(s). The computer may comprise one or more processors (e.g., central processing unit (CPU), micro processing unit (MPU)) and may include a network of separate computers or separate processors to read out and execute the computer executable instructions. The computer executable instructions may be provided to the computer, for example, from a network or the storage medium. The storage medium may include, for example, one or more of a hard disk, a random-access memory (RAM), a read only memory (ROM), a storage of distributed computing systems, an optical disk (such as a compact disc (CD), digital versatile disc (DVD), or Blu-ray Disc (BD)™, a flash memory device, a memory card, and the like. 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions. 
     This application claims the benefit of Japanese Patent Application No. 2021-187295, filed Nov. 17, 2021, which is hereby incorporated by reference herein in its entirety.