Abstract:
A wireless communication system having a plurality of wireless base stations (BSs), and a second BS included under at least one of a first BS among the plurality of BSs and usable by a specified mobile station, the wireless communication system includes registering first identifiers as identifiers of the first BS and a second identifier as an identifier of the second BS in the specified mobile station in advance. The wireless communication system includes transmitting first information to the second BS when an identifier of a present cell is other than the first and second identifiers, and transmitting second information to the second BS when the identifier of the present cell is the first or second identifier, and controlling an operation of the second BS based on the received first or second information.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2008-238894, filed on Sep. 18, 2008, the entire contents of which are incorporated herein by reference. 
     FIELD 
     The present invention relates to a wireless communication system which wirelessly connects a mobile station and a wireless base station, a mobile station, a wireless base station, and a communication method. 
     BACKGROUND 
     As next-generation mobile communication systems emerge, small wireless base stations (hereinafter, “Home eNB”) which are installed in homes and offices and are used by specified subscribers are examined as a part of specifications of LTE (Long Term Evolution), which is discussed in 3GPP (3rd Generation Partnership Project). 
     Conventional wireless base stations are installed in roofs of buildings to which mobile communication providers subscribe, and the mobile communication providers prepare power sources for the wireless base stations, and connect lines from the wireless base stations to the mobile communication providers&#39; networks. Cells which are provided by the wireless base stations can be generally used by all subscribers who subscribe to the mobile communication providers. 
     Subscribers of the mobile communication providers may install Home eNB in homes and further prepare power sources and networks. Contrary to the cells from the conventional wireless base stations, the cells provided by the Home eNB can only be used by the subscribers and others who are allowed by the subscribers, such as family members. 
     The mobile communication providers can more easily expand coverage of mobile communication services by using the Home eNB in comparison to the conventional wireless base stations. Furthermore, communications via the Home eNB allows the mobile communication providers to reduce the costs of the communication charged to the subscribers to a price point that is roughly equivalent to the costs of communication via general fixed networks, thereby encouraging the substitution of fixed networks with mobile telephones networks. As a result, the mobile communication providers can provide new services such as the seamless provisioning of communication services with one home mobile station, in addition to the mobile station outside the home. 
       FIG. 1  illustrates one example of a cell configuration using the Home eNB. In the drawing, a wireless base station (hereinafter referred to as an “evolved Node B” or an “eNB”)  1  is connected to a mobile communication provider network (mobile communication network)  2 , and the wireless base station  1  forms macrocells  3  and  4  at its subordinate positions. 
     A Home eNB  5  is a compact wireless base station which is provided into the macrocell  4 . The Home eNB  5  is connected to the mobile communication network  2  via a public IP (Internet Protocol) network  7 , for example, and forms a home eNB cell  8  at its subordinate position. 
     The Home eNB  5  is connected to the public IP network  7  by a broadband line such as an optical cable or ADSL. 
     A technique which enables only a mobile station which is allowed to use a base station for communications is known. A technique which performs posting/setting from an ultra-compact base station to a portable network and uses a spread code/identification code which is different from codes of neighborhood base stations in order to avoid interference, and a technique which recognizes intrusion/pulling-out of an in-plant network by positional registration of a mobile station and starts/ends the service are known (for example, see Japanese Laid-Open Patent Publication Nos. 2005-109570 and 2006-261722, 2004-274767). 
     Various operational forms of the Home eNB are present, one of them being a form of use in which, when the Home eNB is installed in a residential home, only family mobile stations are permitted to access the Home eNB. In such a Home eNB, where subscribers who can use it are limited, there may be cases where no subscriber is present in this coverage area for a long time. 
     In general, a wireless base station continuously transmits broadcast information even when a subscriber is not present in a coverage area of the base station. When a subscriber moves into the coverage area, the wireless base station instantly accepts a new call request or handover request and continues to provide a smooth and seamless connection to a mobile network. 
     A similar mechanism is applied to the Home eNB, but because no subscriber may be present in the Home eNB coverage area for a long time, the Home eNB may continue to transmit useless information for a time period in which no subscribers are in the coverage area. This is not efficient because electric power is needlessly consumed and peripheral cells may be unnecessarily interfered with. 
     Once the Home eNB stops transmitting broadcast information, the Home eNB may not detect the approach of a subscriber who can otherwise use the Home eNB. In this scenario, the Home eNB may not detect the approach of the subscriber and may not restart the transmission of the broadcast information to provide the subscriber with a smooth and seamless connection to the mobile network. Therefore, in the conventional setting, broadcast information is continuously transmitted otherwise the provision of a smooth and seamless connection environment is given up. If the broadcast information is not continuously transmitted, subscribers of the Home eNB or a family member of the subscriber must manually cut the connection before leaving the coverage area and must manually reconnect the Home eNB to the mobile network after returning home. 
     Further, when a Home eNB is installed in a school or a in a corporate setting, it is difficult to know when the last subscriber who has access to the Home eNB leaves the coverage area. For this reason, it is difficult for the subscriber to decide when to manually turn off the power. 
     SUMMARY 
     According to an aspect of the invention, a wireless communication system having a plurality of wireless base stations, and a second wireless base station included under at least one of a first wireless base station among the plurality of wireless base stations and usable by a specified mobile station, the wireless communication system includes registering first identifiers as identifiers of the first wireless base station and a second identifier as an identifier of the second wireless base station in the specified mobile station in advance. The wireless communication system includes transmitting first information to the second wireless base station when an identifier of a present cell is other than the first and second identifiers, and transmitting second information to the second wireless base station when the identifier of the present cell is the first or second identifier, and controlling an operation of the second wireless base station based on the received first or second information. 
     The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating one example of a cell configuration using a Home eNB; 
         FIG. 2  is a diagram illustrating a cell configuration of a wireless communication system according to one embodiment; 
         FIG. 3  depicts an operation of a mobile station; 
         FIG. 4  depicts an operation of the mobile station; 
         FIG. 5  depicts an operation of MME; 
         FIG. 6  is a diagram of a configuration illustrating the mobile station according to one embodiment; 
         FIG. 7  is a diagram illustrating a transmission message management table; 
         FIG. 8  illustrates a format of a RRC message according to one embodiment; 
         FIG. 9  is a flowchart illustrating a process executed by the mobile station according to one embodiment; 
         FIG. 10  is a diagram of a configuration illustrating the Home eNB according to one embodiment; 
         FIG. 11  illustrates a format of a message transmitted from the MME to the Home eNB according to one embodiment; 
         FIG. 12  illustrates a format of a message transmitted from the eNB or the Home eNB to the MME according to one embodiment; 
         FIG. 13  is a flowchart illustrating a process executed by the Home eNB according to one embodiment; 
         FIG. 14  depicts a case where one vicinity specified area is present; 
         FIG. 15  depicts a case where a plurality of vicinity specified areas are present; and 
         FIG. 16  illustrates a sequence of message transmission/reception according to one embodiment. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     An embodiment will be described below with reference to the drawings. 
     &lt;System Configuration&gt; 
       FIG. 2  illustrates a cell configuration of a wireless communication system according to one embodiment. In  FIG. 2 , a plurality of wireless base stations (eNB)  11   a  to  11   g  (only  11   a  is illustrated) are connected to a network of a mobile communication provider (mobile communication network)  12 , and the wireless base stations  11   a  to  11   b  form macrocells  13   a  to  13   g  at its subordinate position. That is, the wireless base station  11   a  forms the macrocell  13   a,  the wireless base station  11   b  forms the macrocell  13   b,  and similarly the wireless base station  11   g  forms the macrocell  13   g  at its subordinate position. 
     The mobile communication network  12  is provided with MME (Mobility Management Entity)  14  as a control apparatus which entirely controls the wireless communication system. 
     A Home eNB  15  is provided into the macrocell  13   a  at its subordinate position. The Home eNB  15  is connected to the mobile communication network  12  of the mobile communication provider via a public IP network  17 , for example, and the Home eNB  15  forms a Home eNB cell  18  at its subordinate position. The Home eNB  15  is connected to the public IP network  17  via a broadband line such as an optical cable or ADSL. A mobile station (hereinafter sometimes referred to as a “user equipment” or a “UE”)  19  can use the Home eNB  15 . 
     In this case, the Home eNB cell  18  is called a Home eNB area, the macrocell  13   a  which surrounds the Home eNB cell  18  as well as an overlapped part of the Home eNB cell  18  is called a vicinity specified area, and the macrocells  13   b  to  13   g  other than the macrocell  13   a  are called peripheral areas. Further, since the wireless base stations  11   a  to  11   g  form the macrocells, they are also called macro eNB. 
     A cell identifier of the Home eNB  15  and (one or a plurality of) cell identifier of macrocells which compose the vicinity specified area  13   a  of the home eNB  15 , in one embodiment, are registered in the user equipment  19  in advance of transmitting or receiving wireless communications. User equipment  19  can use the Home eNB  15 . 
     &lt;Operation of the Mobile Station at the Time of Establishing a Connection Between the Mobile Station and the Mobile Communication Network&gt; 
     The user equipment  19 , which can use the Home eNB  15 , performs the following operation to establish a connection to the mobile communication network  12 . Once a connection has been established, the user equipment  19  is considered to be in a connected state. 
     Each time a connection cell is changed, the user equipment  19  compares a cell identifier of a cell in which it is presently in a connected state and a cell identifier of a cell in which the user equipment  19  will be newly connected to with the cell identifier of the Home eNB  15  and the cell identifier of a macrocell in the vicinity of specified area  13   a.    
     As illustrated in  FIG. 3 , when the cell identifier of the cell in which the user equipment  19  is presently in a connected state matches the cell identifier of the macrocell in the vicinity specified area  13   a,  and the cell identifier of the cell in which the user equipment  19  will be newly connected to does not match the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity specified area  13   a,  namely, the user equipment  19  moves from the vicinity specified area  13   a  to a peripheral area  13   f,  an “outing” message is transmitted to the MME  14  of the mobile communication network  12  by using the connection established via the macrocell of the peripheral area  13   f.  The “outing” message corresponds to first information. 
     As illustrated in  FIG. 4 , when the cell identifier of the cell in which the user equipment  19  is presently in a connected state does not match the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a,  and the cell identifier of the cell in which the user equipment  19  will be newly connected to matches the cell identifier of the macrocell in the vicinity specified area  13   a,  namely, the user equipment  19  moves from the peripheral area  13   f  to the vicinity of specified area  13   a,  a “return home” message is transmitted to the MME  14  by using the connection established via the macrocell in the vicinity specified area  13   a.  The “return home” message corresponds to second information in a particular embodiment. 
     When the user equipment  19  in a power ON state is changed into a power OFF state, the user equipment  19  compares the cell identifier of the cell connected at the time of the power ON state with the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a.    
     When the cell identifier of the connected cell matches with the cell identifier of the Home eNB  15  or the cell identifier of the macrocell in the vicinity of specified area  13   a,  the “outing” message is transmitted to the MME  14  by using the established connection before the user equipment  19  is turned off. 
     &lt;Operation of the Mobile Station at the Time When the Connection Between the Mobile Station and the Mobile Communication Network has not been Established&gt; 
     The user equipment  19 , which can use the Home eNB  15 , performs the following operation when the connection to the mobile communication network  12  has not been established. In this circumstance, the user equipment  19  is considered to be in the idle state. 
     The user equipment  19 , in the idle state, compares a cell identifier of a cell monitored and a cell identifier of a cell to be newly monitored, with the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a  each time a monitor cell is changed. 
     When the cell identifier of the cell monitored matches the cell identifier of the macrocell in the vicinity of specified area  13   a  and the cell identifier of the cell to be newly monitored does not match the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a,  namely, the user equipment  19  moves from the vicinity of specified area  13   a  to the peripheral area  13   f,  the connection is established via the cell in the peripheral area  13   f,  and the “outing” message is transmitted to the MME  14  by using this connection. 
     When the cell identifier of the cell monitored does not match the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a,  and the cell identifier of the cell to be newly monitored matches the cell identifier of the macrocell in the vicinity of specified area  13   a,  namely, the user equipment moves from the peripheral area  13   f  to the vicinity of specified area  13   a,  the connection is established via the cell in the vicinity of specified area  13   a,  and the “return home” message is transmitted to the MME  14  by using the connection. 
     When the user equipment  19  is changed from the power OFF state into the power ON state, the user equipment  19  compares a cell identifier of a cell in which the position is registered with the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a.    
     When the cell identifier of the cell whose position is registered matches the cell identifier of the Home eNB  15  or the cell identifier of the macrocell in the vicinity of specified area  13   a,  the “return home” message is transmitted to the MME  14  by using the connection established for the position registration. 
     When the user equipment  19  is changed from the power ON state into the power OFF state, the user equipment  19  compares the cell identifier of the cell monitored at the time of power ON with the cell identifier of the Home eNB  15  and the cell identifier of the macrocell in the vicinity of specified area  13   a.    
     When the cell identifier of the monitored cell matches the cell identifier of the Home eNB  15  or the cell identifier of the macrocell in the vicinity of specified area  13   a,  the connection is established via the cell and the “outing” message is transmitted to the MME  14  by using the connection before the user equipment  19  is turned OFF. 
     &lt;Operations of the MME and the Home eNB&gt; 
     As illustrated in  FIG. 5 , the MME  14 , which receives the “return home” message or the “outing” message, transmits the received message to the corresponding Home eNB  15 . 
     The Home eNB  15  manages the states of all user equipment which can use the Home eNB  15 . That is, for the case where the last message received is the “outing” message, the Home eNB  15  considers the user equipment  19  to be in an “outing” state. Similarly, for the case where the last message received is the “return home” message, the user equipment  19  is considered to be in a “return home” state. 
     When all the user equipment which can use the Home eNB  15  are in the “outing” state, the Home eNB  15  reduces or turns off the output power so as to stop the transmission of related broadcast information. 
     When at least one of the user equipment which can use the Home eNB  15  is in the “return home” state with the transmission of the broadcast information being stopped, the Home eNB  15  restarts the transmission of the related broadcast information with the output power being ON or rated output. 
     &lt;Configuration of the Mobile Station&gt; 
       FIG. 6  is a diagram of a configuration illustrating the mobile station which can use the Home eNB according to one embodiment. In  FIG. 6 , the user equipment  19  has a power ON/OFF detecting part  31 , a cell change detecting part  32 , a call processing part  33 , a transmission message management table  34  and a message transmitting part  35 . 
     When the power ON/OFF detecting part  31  detects power ON and OFF of the user equipment, it posts a detected result to the call processing part  33 . 
     When the cell change detecting part  32  detects that the cell where the self user equipment  19  is presently in a connected state is changed, it posts the cell where the self user equipment  19  is present as a detected result to the call processing part  33 . 
     The call processing part  33  stores an unchanged state and a changed state in a built-in storage part  33   a.  When the call processing part  33  receives the posting of the detected result from the power ON/OFF detecting part  31  or the cell change detecting part  32 , it transfers the changed state of the storage part  33   a  to the unchanged state and stores the posted detection state in the changed state of the storage part  33   a.  The call processing part  33  searches the transmission message management table  34  using the unchanged state and the changed state of the storage part  33   a.    
     The cell identifier of the Home eNB which is usable by the self user equipment and (one or a plurality of) the cell identifier of the macrocell in the vicinity specified area are registered in the transmission message management table  34  in advance of transmitting or receiving wireless communications. In the case of a plurality of Home eNBs which are usable by the self user equipment, a plurality of transmission message management tables are provided. 
     As illustrated in  FIG. 7 , transmission messages are registered in the transmission message management table  34  in advance of transmitting or receiving wireless communications, according to the unchanged state and the changed state. That is, when the user equipment  19  is powered ON in an unchanged state and in an area under the Home eNB, and the changed state is powered OFF, the “outing” message is set. When the user equipment  19  is powered ON in an unchanged state and in the vicinity of specified an area and the changed state is powered ON and the user equipment  19  is relocated to a peripheral area or powered OFF, the “outing” message is set. 
     When the user equipment  19  is powered ON and in the unchanged state and in the peripheral area, and the changed state is in the vicinity specified area, the “return home” message is set. When the user equipment  19  is powered OFF and in the unchanged state, and the changed state is powered ON and in the area under the Home ENB or in the vicinity of specified an area, the “return home” message is set. No message is set when the search of the transmission message management table results in a “None”. 
     When the call processing part  33  acquires the “outing” message or the “return home” message by searching the transmission message management table  34 , it supplies the acquired “outing” message or “return home” message to the message transmitting part  35 . 
     The message transmitting part  35  transmits the supplied “outing” message or “return home” message as an RRC (Radio Resource Control) message to the MME  14  via the eNB or the Home eNB. 
       FIG. 8  illustrates a format of the RRC message according to one embodiment. In  FIG. 8 , an RRC header is provided within the head of the message, and a “Home eNB” posting message (up link) is set within the subsequent message type field. The “return home” message or the “outing” messaging is set within the signal type field, and the identifier of the user equipment  19  of a transmission source is set within the user equipment identifier field. The identifier of the MME  14  is set within the MME identifier field, and the identifier of the Home eNB  15  to which the message is transmitted by the MME  14  is set within the Home eNB identifier field. 
     The RRC message is converted into a message of S1-AP protocol in  FIG. 12  and described later by the eNB or the Home eNB so as to be transmitted to the MME  14 .  FIG. 12  illustrates a format of the message to be transmitted from the eNB or the Home NB to the MME according to one embodiment. 
     The flowchart of  FIG. 9  illustrates a process to be executed by the call processing part of the user equipment according to one embodiment. In  FIG. 9  at step S 11 , the call processing part  33  receives a detected result from the power ON/OFF detecting part  31  or the cell change detecting part  32 . 
     The call processing part  33  determines whether the state is changed at step S 12 , and when the state is not changed, the process proceeds to step S 11 , and when the state is changed, the process proceeds to step S 13 . The call processing part  33  searches the transmission message management table  34  using the unchanged state and the changed state so as to determine a transmission message at step S 13 . 
     The call processing part  33  determines whether the transmission message is acquired at step S 14 . When the transmission message is not acquired, the process proceeds to step S 11 . When the transmission message is acquired, the call processing part  33  determines whether the self user equipment is in an idle state at step S 15 . When the self user equipment is in the idle state, the call processing part  33  establishes an RRC connection to the MME  14  in step S 16 , and the process proceeds to step S 17 . 
     When the self user equipment is not in the idle state but establishes a connection to the mobile communication network  12 , the process proceeds to step S 17 . The call processing part  33  transmits the “outing” message or the “return home” message acquired from the transmission message management table  34  at step S 17  to the MME  14  via the eNB or the Home eNB so that the process proceeds to step S 11 . 
     &lt;Configuration of the Home eNB&gt; 
       FIG. 10  is a diagram of a configuration illustrating the Home eNB according to one embodiment. In  FIG. 10 , the Home eNB  15  has an S 1  message receiving part  41 , a call processing part  42 , a user equipment state management table  43 , a wireless output control part  44 , an RRC message receiving part  45 , a message converting part  46  and an S 1  message transmitting part  47 . 
     The S 1  message receiving part  41  receives a message of S1-AP protocol transmitted from the MME  14  via the mobile communication network  12  and the IP network  17  so as to supply it to the call processing part  42 . For example, S 1  is the name of interface between the MME  14  and the eNB in LTE, and S1-AP is control signal protocol on the S 1  interface. 
       FIG. 11  illustrates a format of the message to be transmitted from the MME to the Home eNB according to one embodiment. In  FIG. 11 , an S1-AP header is provided within the head field, and “down link” (transmission from the MME  14  to the Home eNB) is set within the subsequent message type field. The “Return home” or “outing” is set within the signal type field, and an identifier of a mobile station as transmitting destination is set within the mobile station identifier field. 
     When the message is supplied to the call processing part  42  from the S 1  message receiving part  41 , the call processing part  42  refers to the user equipment state management table  43  using the user equipment identifier of the message, and updates the state of the user equipment  19  in the user equipment state management table  43 , based on “return home” or “outing” in the signal type of the message. 
     The names of all the user equipment which can connect to the Home eNB  15 , and user equipment identifiers and states (for example, “return home” or “outing”) are registered in the user equipment state management table  43 . 
     The call processing part  42  controls the wireless output from the wireless output control part  44 , according to whether the states of all of the user equipment  19  registered in the user equipment state management table  43  are “outing”. 
     When the states of all of the user equipment  19  registered in the user equipment state management table  43  are “outing,” the wireless output control part  44  sets the wireless output to OFF (or reduces it), and when the states of all the user equipments  19  are not “outing,” the wireless output control part  44  sets the wireless output to ON (or rated output). 
     The RRC message receiving part  45  receives the RRC message transmitted from the user equipment  19  and supplies it to the message converting part  46 . The message converting part  46  converts the RRC message into a message of S1-AP protocol, and transmits it to the MME  14  from the S 1  message transmitting part  47  via the IP network  17  and the mobile communication network  12 . 
       FIG. 12  illustrates a format of the message to be transmitted from the eNB or Home eNB to the MME according to one embodiment. In  FIG. 12 , an S1-AP header is provided within the head field, and “up link” (transmission from the Home eNB to the MME  14 ) is set within the subsequent message type field. The “Return home” or “outing” is set within the signal type field, and the identifier of the user equipment  19  as transmitting destination is set within the user equipment identifier field. The identifier of the MME  14  as transmitting destination is set within the MME identifier field, and the identifier of the Home eNB  15  as destination to which the MME  14  transmits the message is set within the Home eNB identifier field. 
       FIG. 13  is a flowchart illustrating a process to be executed by the call processing part  42  of the Home eNB according to one embodiment. In  FIG. 13 , the call processing part  42  receives a message transmitted to the Home eNB at step S 21 . 
     The call processing part  42  refers to the user equipment state management table  43  using the user equipment identifier of a received message, and updates the state of the user equipment in the user equipment state management table  43  based on “return home” or “outing” on the signal type of the message at step S 22 . Thereafter, the call processing part  42  determines at step S 23  whether the states of all the user equipment registered in the user equipment state management table  43  are of the “outing” state. 
     When all the user equipment are in the “outing” state, the process proceeds to step S 24 , and when the wireless output control part  44  is performing wireless output, the wireless output control part  44  is turned off (or reduces output) at step S 25 , and the process proceeds to step S 21 . 
     When all the user equipment are not in the “outing” state, the process proceeds to step S 26 , and when the wireless output control part  44  is stopping wireless output, the wireless output control part  44  is turned on (or rated output) at step S 27 , and the process proceeds to step S 21 . 
     &lt;Registered Information about Mobile Station&gt; 
     As illustrated in  FIG. 14 , one macrocell  13   a  which surrounds a Home eNB cell  18   a  as well as an overlapped portion of the Home eNB cell  18   a  is a vicinity specified area. In the following description, a cell identifier of the Home eNB cell  18   a  is  12 , a cell identifier of the macrocell  13   a  as the vicinity specified area is  58 , and only a user equipment A (identifier= 101 ), a user equipment B (identifier= 162 ) and a user equipment C (identifier= 16 ) can use the Home eNB cell  18 . 
     In this case, the cell identifier  12  of the Home eNB cell  18   a  is usable by the self user equipment and the cell identifier  58  of the macrocell in the vicinity specified area are registered in the user equipments A, B and C, in one embodiment, in advance of transmitting or receiving wireless communications. 
     As illustrated in  FIG. 15 , three macrocells  13   a,    13   b  and  13   c  which surround a Home eNB cell  18   b  so as to overlap with or be adjacent to the Home eNB cell  18   b  are vicinity specified areas. In the following description, the cell identifier of the Home eNB cell  18   b  is  12 , the cell identifier of the macrocell  13   a  in the vicinity specified area is  58 , a cell identifier of the macrocell  13   b  is  261 , the cell identifier of the macrocell  13   c  is  122 , and only the user equipment A (identifier= 101 ), the user equipment B (identifier= 162 ) and the user equipment C (identifier= 16 ) can use the Home eNB cell  18   b.    
     In this case, the cell identifier  12  of the Home eNB  18   b  is usable by the self user equipment and the cell identifiers  58 ,  122  and  261  of the macrocells in the vicinity specified areas are registered in the user equipments A, B and C, in one embodiment, in advance of transmitting or receiving wireless communications. 
       FIG. 16  illustrates a sequence of the message transmission/reception according to one embodiment. In  FIG. 16 , transmission trigger of the “outing” or “return home” message is generated from the user equipment  19  (S 31 ). When the user equipment  19  is in the idle state, after the RRC connection to the MME  14  is established (S 32 ), the user equipment  19  transmits the “outing” or “return home” message to a macro eNB  11   a  (S 33 ). The macro eNB  11   a  transmits the “outing” or “return home” message to the MME  14  (S 34 ). 
     The MME  14  transmits the received “outing” or “return home” message to the Home eNB  15  (S 35 ). As a result, the Home eNB  15  updates the user equipment state management table  43 , and controls the wireless output control part  44  if necessary. 
     According to the above embodiment, the Home eNB  15  can manage in/out of the user equipment  19  capable of using the Home eNB present under the Home eNB  15  or in the vicinity specified area. When the user equipment  19  is not present under the Home eNB  15  or in the vicinity specified area, the Home eNB  15  can stop transmission of broadcast information. As a result, useless interference and consumption of electric power can be prevented. 
     When the user equipment  19  is present in the vicinity specified area, the Home eNB  15  can transmit broadcast information. As a result, an environment can be provided in which the user equipment  19  is smoothly and seamlessly connected to the Home eNB  15 . 
     According to the above embodiment, the smooth connecting environment can be provided, and power-saving control of wireless base stations usable by only specified mobile stations can be realized. 
     All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiment(s) of the present inventions have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.