WO2012176474A1 - Radio communication system - Google Patents

Radio communication system Download PDF

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Publication number
WO2012176474A1
WO2012176474A1 PCT/JP2012/004075 JP2012004075W WO2012176474A1 WO 2012176474 A1 WO2012176474 A1 WO 2012176474A1 JP 2012004075 W JP2012004075 W JP 2012004075W WO 2012176474 A1 WO2012176474 A1 WO 2012176474A1
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Prior art keywords
base station
tracking area
home base
station apparatus
macro
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PCT/JP2012/004075
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French (fr)
Japanese (ja)
Inventor
裕太 関
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パナソニック株式会社
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Publication of WO2012176474A1 publication Critical patent/WO2012176474A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to a wireless communication system.
  • a femto cell having a smaller communication area than a macro cell formed by a conventional macro base station apparatus is being studied.
  • the home base station is assumed to be installed in a small communication area.
  • a device (HeNB) has been studied (see Non-Patent Document 1).
  • the home base station apparatus is installed in each home, for example, and it is assumed that only a specific user such as a family is permitted to access the home base station apparatus.
  • the number of accommodated terminals per base station apparatus can be reduced and the communication load can be reduced.
  • the communication distance between the communication terminal apparatus (UE) and the home base station apparatus is shorter than the communication distance between the communication terminal apparatus and the macro base station apparatus, the power consumption of the communication terminal apparatus can be reduced.
  • the communication terminal device can move between different cells.
  • the base station control device MME
  • MME does not manage which cell the communication terminal device is in, but manages whether the communication terminal device belongs to a range called a tracking area (TA).
  • the tracking area may be referred to as a position registration area, a routing area, or a location area. For example, when an incoming call addressed to a communication terminal apparatus occurs, paging is performed all at once in the tracking area.
  • TAU tracking area update
  • the base station control apparatus updates the tracking area to which the communication terminal apparatus belongs.
  • multi-tracking area registration in which a plurality of tracking areas around the communication terminal apparatus are assigned to one communication terminal apparatus is also being studied.
  • a plurality of tracking areas allocated to one communication terminal apparatus are managed by a tracking area list (TA list).
  • the communication terminal apparatus performs the tracking area update only when moving to a tracking area that is not included in the tracking area list.
  • the base station control device determines in which area of the wireless communication system the home base station device is installed. It is difficult to judge accurately.
  • a tracking area different from the tracking area of the macro base station device around the home base station device is assigned to the home base station device, or the tracking area list to which the tracking area of the macro base station device belongs is the tracking area of the home base station device.
  • the same tracking area as the tracking area of the macro base station device around the home base station device is assigned to the home base station device, or the tracking area of the macro base station device belongs to the tracking area of the home base station device
  • the home base station apparatus needs to recognize the installation position of the own station and report the position to the base station control apparatus that manages the tracking area.
  • a method in which the home base station apparatus receives broadcast information transmitted by macro base station apparatuses around the home base station apparatus and recognizes the installation position of the own station from the position information of the macro base station apparatus included in the broadcast information Has been proposed (see Patent Document 1).
  • the home base station apparatus since the broadcast information transmitted by the macro base station apparatus is originally for the communication terminal apparatus, in order for the home base station apparatus to receive the broadcast information, the home base station apparatus must Since it is necessary to provide the same interface as the interface for communication terminal apparatuses and the reception function identical to the reception function of the communication terminal apparatuses, there is a problem that the configuration of the home base station apparatus becomes complicated.
  • the home base station device when the home base station device is installed in a place where radio waves from the macro base station device do not reach, such as underground or indoor, the home base station device cannot receive broadcast information from the macro base station device in the first place. .
  • the present invention has been made in view of this point, and the home base station apparatus can report the installation position of the own station to the base station control apparatus without relying on broadcast information transmitted by the macro base station apparatus.
  • An object of the present invention is to provide a wireless communication system.
  • a radio communication system of the present invention includes a macro base station apparatus that forms a macro cell, a home base station apparatus that forms a femto cell smaller than the macro cell in the macro cell, a communication terminal apparatus, and a base station control apparatus.
  • the communication terminal apparatus moves from the macro cell to the femto cell and changes the connection destination from the macro base station apparatus to the home base station apparatus.
  • Report the first tracking area to the home base station device, and the home base station device associates the reported first tracking area with the second tracking area of the home base station device to determine the location information of the local station.
  • To the base station controller and the base station controller uses the position information to identify the first track. If judged to include said the ring area second tracking area, the tracking area list, or to update the second tracking area.
  • the home base station apparatus can report the installation position of its own station to the base station control apparatus without depending on the broadcast information transmitted by the macro base station apparatus.
  • wireless communications system which concerns on Embodiment 1 of this invention The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 1 of this invention.
  • FIG. 1 is a diagram showing a wireless communication system according to the present embodiment.
  • the tracking area of eNB # 0 is TA # 0
  • the tracking area of eNB # 1 is TA # 1
  • TA # 0 and TA # 1 belong to the same TA list #A.
  • HeNB # 2 shall be installed in the area which overlaps with a part of TA # 0. Since HeNB # 2 cannot recognize the installation position of its own station, a new TA # 2 belonging to a new TA list #C is assigned by the MME.
  • UE # 00 and UE # 01 are located in the macro cell formed by eNB # 0, and UE # 10 is located in the macro cell formed by eNB # 1.
  • UE # 00 receives broadcast information including TA # 0 of eNB # 0 from eNB # 0.
  • UE # 00 moves from the macro cell formed by eNB # 0 to the femto cell formed by HeNB # 2, and changes the connection destination from eNB # 0 to HeNB # 2, TA # 0 of eNB # 0 is changed to HeNB. Report to # 2.
  • HeNB # 2 associates TA # 0 reported from UE # 00 with TA # 2 that is the TA of the local station, and reports both TA # 0 and TA # 2 to the MME as location information of the local station .
  • HeNB # 2 can share TA (TA # 2) of an own station with MME in advance, it is TA # reported from UE # 00 that HeNB # 2 reports to MME at this timing. Only 0 may be used.
  • the MME determines that HeNB # 2 is installed in the area of TA # 0 because both TA # 0 and TA # 2 are reported from HeNB # 2 as the location information of HeNB # 2, and FIG.
  • TA # 2 is registered in TA list #A to which TA # 0 belongs to update TA list #A, and TA list #C is deleted from TA list #C to update TA list #C.
  • the MME determines that TA # 2 is included in TA # 0 and updates the TA list.
  • the TA of HeNB # 2 belongs to the same TA list as the TA list to which the TA of eNB # 0 belongs.
  • MME notifies updated TA list to eNB # 0, eNB # 1, and HeNB # 2. Furthermore, HeNB # 2 notifies the updated TA list to UE # 00, eNB # 0 notifies the updated TA list to UE # 01, and eNB # 1 transmits the updated TA list to UE # 10. Notice.
  • HeNB # 2 when HeNB # 2 receives the report of TA # 0 from UE # 00, HeNB # 2 reports the installation position of the own station to MME without depending on the broadcast information transmitted by eNB # 0. can do. Moreover, since MME includes TA # 2 of HeNB # 2 in TA list #A to which TA # 0 of eNB # 0 belongs, it is possible to prevent frequent occurrence of tracking area updates.
  • FIG. 2 shows a configuration of communication terminal apparatus 10 according to the present embodiment.
  • the radio reception unit 12 receives a signal from the macro base station device and a signal from the home base station device 20 via the antenna 11, and receives a home base station search unit 13 and a TA extraction unit 14. , And output to the TA list extraction unit 16.
  • the signal from the macro base station apparatus includes broadcast information including the TA of the macro base station apparatus.
  • the TA list generated by the base station control device 30 is included in the signal from the macro base station device and the signal from the home base station device 20.
  • the home base station search unit 13 searches for a home base station device that is present around the communication terminal device 10 and is connectable to the communication terminal device 10. That is, the home base station search unit 13 measures the reception level of the signal from the macro base station apparatus and the reception level of the signal from the home base station apparatus 20, and the home base station apparatus moves as the communication terminal apparatus 10 moves. When the reception level of the signal from 20 is determined to be better than the reception level of the signal from the macro base station apparatus, the connection destination of the communication terminal apparatus 10 is changed from the macro base station apparatus to the home base station apparatus 20. And the TA extraction unit 14 is notified of this. As described above, the home base station search unit 13 searches for the home base station apparatus using the reception level of the signal from the home base station apparatus 20.
  • the TA extraction unit 14 extracts the TA of the macro base station device from the broadcast information included in the received signal from the macro base station device in accordance with the notification from the home base station search unit 13 and outputs the TA to the wireless transmission unit 15.
  • the radio transmission unit 15 transmits the TA extracted by the TA extraction unit 14 to the home base station apparatus 20 via the antenna 11.
  • the TA list extraction unit 16 extracts the TA list from the received signal and outputs it to the TA list storage unit 17.
  • the TA list storage unit 17 stores the TA list output from the TA list extraction unit 16.
  • FIG. 3 shows the configuration of home base station apparatus 20 according to the present embodiment.
  • the radio reception unit 22 receives a signal including the TA of the macro base station apparatus from the communication terminal apparatus 10 via the antenna 21 and outputs the signal to the position information generation unit 23.
  • the position information generation unit 23 extracts the TA of the macro base station apparatus from the received signal, generates the position information of the own station by associating the TA of the macro base station apparatus and the TA of the own station, and uses the position information as an interface unit 24.
  • the interface unit 24 transmits the position information output from the position information generation unit 23 to the base station control device 30. Further, the interface unit 24 receives the TA allocated by the base station control device 30 and the TA list generated by the base station control device 30 from the base station control device 30, and transmits the TA list storage unit 25 and the wireless transmission. To the unit 26.
  • the TA list storage unit 25 stores the TA and the TA list output from the interface unit 24.
  • the wireless transmission unit 26 transmits the TA and the TA list output from the interface unit 24 to the communication terminal device 10.
  • FIG. 4 shows the configuration of base station control apparatus 30 according to the present embodiment.
  • the interface unit 31 receives the position information transmitted from the home base station device 20 and outputs it to the TA list management unit 32. Further, the interface unit 31 transmits the TA and the TA list output from the TA list management unit 32 to the home base station device 20 and the macro base station device.
  • the TA list management unit 32 stores the TA and the TA list. As described above, the TA list management unit 32 updates the TA list based on the location information transmitted from the home base station apparatus 20, and displays the updated TA list as an interface unit. To 31.
  • the home base station apparatus may report the position information reported from the communication terminal apparatus to the base station control apparatus MME only when the position information is different from the previously reported position information. .
  • the present embodiment is different from the first embodiment in that the base station control apparatus does not update the TA list but updates the TA reported from the home base station apparatus.
  • FIG. 5 is a diagram showing a wireless communication system according to the present embodiment. Note that FIG. 5A is the same as FIG. Hereinafter, only differences from FIG. 1B in FIG. 5B will be described.
  • the MME determines that the HeNB # 2 is installed in the area of the TA # 0 because both the TA # 0 and the TA # 2 are reported from the HeNB # 2 as the location information of the HeNB # 2, and is shown in FIG. 5B. Thus, TA # 2 reported from HeNB # 2 is updated to TA # 0. That is, since both TA # 0 and TA # 2 are reported from HeNB # 2, the MME determines that TA # 2 is included in TA # 0 and updates TA # 2 to TA # 0. Alternatively, the MME may update TA # 2 to TA # 1. That is, the MME updates the TA of HeNB # 2 to any TA included in the TA list to which the TA of eNB # 0 belongs. As a result, the TA of HeNB # 2 belongs to the same TA list as the TA list to which the TA of eNB # 0 belongs.
  • MME notifies TA after an update to HeNB # 2. Also, HeNB # 2 notifies the updated TA to UE # 00.
  • HeNB # 2 when HeNB # 2 receives the report of TA # 0 from UE # 00, HeNB # 2 reports the installation position of the own station to MME without depending on the broadcast information transmitted by eNB # 0. can do. Further, since the MME updates the TA of HeNB # 2 to the same TA as that of eNB # 0, frequent occurrence of tracking area updates can be prevented.
  • the TA list management unit 32 stores the TA and the TA list, and is transmitted from the home base station device 20 as described above.
  • the TA is updated based on the position information, and the updated TA is output to the interface unit 31.
  • an identifier indicating whether the TA is the home base station apparatus that is, the TA of the macro base station apparatus and the TA of the home base station apparatus are distinguished.
  • the difference from Embodiment 1 is that an identifier is assigned.
  • FIG. 6 is a diagram showing a radio communication system according to the present embodiment. Hereinafter, only differences from FIG. 1B in FIG. 6 will be described.
  • the MME further assigns an identifier for distinguishing between the TA of the macro base station apparatus and the TA of the home base station apparatus for each TA.
  • MME is compared with TA # 0 and TA # 1. While “0” indicating that the TA is not the home base station apparatus is assigned, “1” indicating that the TA is the home base station apparatus is assigned to TA # 2.
  • MME notifies TA list
  • the UE # 00 that has received the TA list after the identifier assignment determines whether each TA in the TA list is the TA of the macro base station apparatus or the TA of the home base station apparatus based on the assigned identifier. While tracking area update is performed when moving from TA # 0 to TA # 2, tracking area update is not performed when moving from TA # 2 to TA # 0. That is, UE # 00 performs tracking area update when moving from the TA of the macro base station apparatus to the TA of the home base station apparatus, and updates tracking area when moving from the TA of the home base station apparatus to the TA of the macro base station apparatus. Do not do.
  • UE # 00 transmits a tracking area update request to the MME via the HeNB # 2 when moving from the TA of the macro base station apparatus to the TA of the home base station apparatus, and the macro of the home base station apparatus When the base station apparatus moves to the TA, a tracking area update request is not transmitted.
  • the MME can detect that the UE # 00 has moved to the femto cell formed by the HeNB # 2, and thus can manage the capacity load of the eNB # 0.
  • the tracking area update is not performed when moving from the TA of the home base station apparatus to the TA of the macro base station apparatus, resource loss in a macro cell in which many communication terminal apparatuses are located Can be reduced.
  • the communication terminal apparatus is located in the femtocell by transmitting paging in the order of (1) TA addressed to home base station apparatus ⁇ (2) TA addressed to macro base station apparatus. In this case, since paging from the macro base station apparatus can be stopped, the paging load can be reduced.
  • the present embodiment it is possible to determine whether or not the communication terminal apparatus is located in the femtocell. Therefore, if the communication terminal apparatus is not located in the femtocell, the home base station The device can be put to sleep to reduce power consumption.
  • the present embodiment is different from the first embodiment in that the communication terminal apparatus stores the macro base station apparatus TA and the home base station apparatus TA in association with each other.
  • FIG. 7 shows the configuration of communication terminal apparatus 40 according to the present embodiment.
  • the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
  • the signal received by the wireless reception unit 12 from the macro base station device includes broadcast information including the TA of the macro base station device. Further, the signal received by the wireless reception unit 12 from the home base station apparatus includes the TA of the home base station apparatus.
  • the TA extraction unit 41 extracts the TA of the macro base station device from the broadcast information included in the received signal from the macro base station device in accordance with the notification from the home base station search unit 42, and the wireless transmission unit 15 and the TA list storage unit Output to 43. Further, the TA extraction unit 41 extracts the TA of the home base station device included in the received signal from the home base station device, and outputs it to the TA list storage unit 43. Further, each time the reception signal from the macro base station apparatus is input, the TA extraction unit 41 extracts the TA of the macro base station apparatus from the broadcast information included in the reception signal and outputs the TA to the home base station search unit 42. .
  • the TA list storage unit 43 stores the TA list output from the TA list extraction unit 16 as in the first embodiment. Further, the TA list storage unit 43 stores the TA of the macro base station apparatus and the TA of the home base station apparatus in association with each other.
  • the home base station search unit 42 refers to the TA list storage unit 43, refers to the TA of the macro base station device associated with the TA of the home base station device, and the TA of the macro base station device input from the TA extraction unit 41. To determine whether to search for the home base station apparatus.
  • the home base station search unit 42 determines whether to search for the home base station apparatus according to whether the TA included in the broadcast information is associated with the TA of the home base station apparatus.
  • TA list storage unit 43 includes eNB # TA # 0 of 0 and TA # 2 of HeNB # 2 are stored in association with each other. And when UE # 00 moves to the macro cell which eNB # 1 forms, TA # 1 of eNB # 1 is extracted by the TA extraction part 41, and is input into the home base station search part 42.
  • FIG. Since TA # 1 is not associated with TA # 2 of the home base station device in the TA list storage unit 43, in this case, the home base station search unit 42 stops searching for the home base station device.
  • the communication terminal apparatus can stop searching for the home base station apparatus when the communication terminal apparatus is located in a macro cell where the home base station apparatus does not exist. Power consumption can be reduced.
  • the communication terminal apparatus may lower the search priority of the home base station apparatus when the communication terminal apparatus is in a macro cell where the home base station apparatus does not exist.
  • the location information includes the PCI (Physical Cell ID) of the cell where the communication terminal device is located immediately before, the neighboring cell information of the cell where the communication terminal device was located immediately before, or the communication terminal device is located immediately before. You may include the reception power of the cell and the surrounding cell.
  • PCI Physical Cell ID
  • the present invention can be applied to a wireless communication system other than the LTE / SAE system in the same manner as described above.
  • the present invention is not limited to the case where a home base station apparatus is newly installed, but can be implemented in the same manner as described above when a femto base station apparatus or a macro base station apparatus is newly installed.
  • the present invention is suitable for a wireless communication system that manages the installation position of a home base station apparatus.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Provided is a radio communication system allowing a home base station device to report the installation position of the station to a base station control device without relying on report information sent by a macro base station device. In this system, the radio receiver (22) in the home base station device (20) receives signals including a macrocell TA from a communication terminal device (10) via an antenna (21), the signals are outputted to a position information generator (23), the position information generator (23) extracts the macrocell TA from the received signals, the macrocell TA is associated with the TA of the home base station and position information on the home base station is generated, the position information is outputted to an interface unit (24), and the interface unit (24) sends the position information outputted from the position information generator (23) to the base station control device (30).

Description

無線通信システムWireless communication system
　本発明は、無線通信システムに関する。 The present invention relates to a wireless communication system.
　従来のマクロ基地局装置（ｅＮＢ）が形成するマクロセルより通信エリアが小さいフェムトセルの運用が検討されている。例えば、標準化団体３ＧＰＰ（3rd Generation Partnership Project）で標準化が進められているＬＴＥ（Long Term Evolution）／ＳＡＥ（System Architecture Evolution）システムにおいても、小規模な通信エリアに設置することを想定したホーム基地局装置（ＨｅＮＢ）が検討されている（非特許文献１参照）。ホーム基地局装置は、例えば各家庭に設置され、家族など特定のユーザのみにホーム基地局装置へのアクセスを許可する運用が想定されている。ホーム基地局装置の設置により、１基地局装置あたりの収容端末数が減って通信負荷が低減することができる。また、通信端末装置（ＵＥ）とホーム基地局装置との通信距離は、通信端末装置とマクロ基地局装置との通信距離より短いため、通信端末装置の電力消費を低減することができる。 An operation of a femto cell having a smaller communication area than a macro cell formed by a conventional macro base station apparatus (eNB) is being studied. For example, in the LTE (Long Term Evolution) system / SAE (System Architecture Evolution) system, which is being standardized by the 3GPP (3rd Generation Generation Partnership Project), the home base station is assumed to be installed in a small communication area. A device (HeNB) has been studied (see Non-Patent Document 1). The home base station apparatus is installed in each home, for example, and it is assumed that only a specific user such as a family is permitted to access the home base station apparatus. By installing the home base station apparatus, the number of accommodated terminals per base station apparatus can be reduced and the communication load can be reduced. Further, since the communication distance between the communication terminal apparatus (UE) and the home base station apparatus is shorter than the communication distance between the communication terminal apparatus and the macro base station apparatus, the power consumption of the communication terminal apparatus can be reduced.
　通信端末装置は、異なるセル間を移動することができる。これに対し、基地局制御装置（ＭＭＥ）は、通信端末装置がどのセルに在圏しているかは管理せず、トラッキングエリア（ＴＡ）と呼ばれる範囲に通信端末装置が属するか否かを管理する。トラッキングエリアは、位置登録エリア、ルーティングエリア、または、ロケーションエリアと呼ばれることもある。例えば通信端末装置宛の着信が発生した場合には、トラッキングエリアに一斉にページングが行われる。通信端末装置は、異なるトラッキングエリアに移動した場合にトラッキングエリアアップデート（ＴＡＵ）を行い、基地局制御装置は、通信端末装置が属するトラッキングエリアを更新する。 The communication terminal device can move between different cells. On the other hand, the base station control device (MME) does not manage which cell the communication terminal device is in, but manages whether the communication terminal device belongs to a range called a tracking area (TA). . The tracking area may be referred to as a position registration area, a routing area, or a location area. For example, when an incoming call addressed to a communication terminal apparatus occurs, paging is performed all at once in the tracking area. When the communication terminal apparatus moves to a different tracking area, the communication terminal apparatus performs tracking area update (TAU), and the base station control apparatus updates the tracking area to which the communication terminal apparatus belongs.
　トラッキングエリア境界付近においてトラッキングエリアアップデートが頻発することを防ぐために、１通信端末装置に対して通信端末装置周辺の複数のトラッキングエリアを割り当てるマルチトラッキングエリア登録も検討されている。１通信端末装置に対して割り当てられた複数のトラッキングエリアはトラッキングエリアリスト（ＴＡリスト）によって管理される。通信端末装置は、トラッキングエリアリストに含まれないトラッキングエリアに移動した場合にのみ、トラッキングエリアアップデートを行う。 In order to prevent frequent tracking area updates near the tracking area boundary, multi-tracking area registration in which a plurality of tracking areas around the communication terminal apparatus are assigned to one communication terminal apparatus is also being studied. A plurality of tracking areas allocated to one communication terminal apparatus are managed by a tracking area list (TA list). The communication terminal apparatus performs the tracking area update only when moving to a tracking area that is not included in the tracking area list.
　ここで、ホーム基地局装置は使用者により有線回線に接続されて設置されることが想定されるため、基地局制御装置は、ホーム基地局装置が無線通信システムのどのエリアに設置されたのかを正確に判断することが難しい。 Here, since it is assumed that the home base station device is installed by being connected to a wired line by the user, the base station control device determines in which area of the wireless communication system the home base station device is installed. It is difficult to judge accurately.
　そこで、ホーム基地局装置に対しホーム基地局装置周辺のマクロ基地局装置のトラッキングエリアと異なるトラッキングエリアを割り当てる、または、ホーム基地局装置のトラッキングエリアをマクロ基地局装置のトラッキングエリアが属するトラッキングエリアリストと異なるトラッキングエリアリストに登録する場合、ホーム基地局装置が形成するフェムトセルの通信エリアは小さいため、トラッキングエリアアップデートが頻発することが予想される。 Therefore, a tracking area different from the tracking area of the macro base station device around the home base station device is assigned to the home base station device, or the tracking area list to which the tracking area of the macro base station device belongs is the tracking area of the home base station device When the registration is performed in a different tracking area list, since the communication area of the femtocell formed by the home base station apparatus is small, it is expected that tracking area updates frequently occur.
　一方で、ホーム基地局装置に対しホーム基地局装置周辺のマクロ基地局装置のトラッキングエリアと同一のトラッキングエリアを割り当てる、または、ホーム基地局装置のトラッキングエリアをマクロ基地局装置のトラッキングエリアが属するトラッキングエリアリストに登録するには、ホーム基地局装置は自局の設置位置を認識し、トラッキングエリアを管理する基地局制御装置にその位置を報告する必要がある。そこで、ホーム基地局装置が、ホーム基地局装置周辺のマクロ基地局装置が送信する報知情報を受信し、その報知情報に含まれるマクロ基地局装置の位置情報から自局の設置位置を認識する方法が提案されている（特許文献１参照）。 On the other hand, the same tracking area as the tracking area of the macro base station device around the home base station device is assigned to the home base station device, or the tracking area of the macro base station device belongs to the tracking area of the home base station device In order to register in the area list, the home base station apparatus needs to recognize the installation position of the own station and report the position to the base station control apparatus that manages the tracking area. Thus, a method in which the home base station apparatus receives broadcast information transmitted by macro base station apparatuses around the home base station apparatus and recognizes the installation position of the own station from the position information of the macro base station apparatus included in the broadcast information Has been proposed (see Patent Document 1).
国際公開第２００８／１３６４１６号International Publication No. 2008/136416
　しかしながら、マクロ基地局装置が送信する報知情報は、本来、通信端末装置に対するものであるため、ホーム基地局装置がその報知情報を受信するためには、ホーム基地局装置は、マクロ基地局装置－通信端末装置間用のインタフェースと同一のインタフェース、および、通信端末装置の受信機能と同一の受信機能を備える必要があるため、ホーム基地局装置の構成が複雑になるという課題がある。 However, since the broadcast information transmitted by the macro base station apparatus is originally for the communication terminal apparatus, in order for the home base station apparatus to receive the broadcast information, the home base station apparatus must Since it is necessary to provide the same interface as the interface for communication terminal apparatuses and the reception function identical to the reception function of the communication terminal apparatuses, there is a problem that the configuration of the home base station apparatus becomes complicated.
　さらに、ホーム基地局装置が地下や屋内など、マクロ基地局装置からの電波が届かない場所に設置された場合には、ホーム基地局装置はそもそもマクロ基地局装置から報知情報を受信することができない。 Further, when the home base station device is installed in a place where radio waves from the macro base station device do not reach, such as underground or indoor, the home base station device cannot receive broadcast information from the macro base station device in the first place. .
　本発明は、かかる点に鑑みてなされたものであり、ホーム基地局装置がマクロ基地局装置によって送信される報知情報に依ることなく、自局の設置位置を基地局制御装置に報告することができる無線通信システムを提供することを目的とする。 The present invention has been made in view of this point, and the home base station apparatus can report the installation position of the own station to the base station control apparatus without relying on broadcast information transmitted by the macro base station apparatus. An object of the present invention is to provide a wireless communication system.
　本発明の無線通信システムは、マクロセルを形成するマクロ基地局装置と、前記マクロセル内において前記マクロセルより小さいフェムトセルを形成するホーム基地局装置と、通信端末装置と、基地局制御装置と、を具備する無線通信システムであって、前記通信端末装置は、前記マクロセルから前記フェムトセルへ移動して前記マクロ基地局装置から前記ホーム基地局装置へ接続先を変更するときに、前記マクロ基地局装置の第１トラッキングエリアを前記ホーム基地局装置へ報告し、前記ホーム基地局装置は、報告された前記第１トラッキングエリアと、前記ホーム基地局装置の第２トラッキングエリアとを関連付けて自局の位置情報として前記基地局制御装置へ報告し、前記基地局制御装置は、前記位置情報により、前記第１トラッキングエリアに前記第２トラッキングエリアが含まれると判断する場合に、トラッキングエリアリスト、または、前記第２トラッキングエリアを更新する。 A radio communication system of the present invention includes a macro base station apparatus that forms a macro cell, a home base station apparatus that forms a femto cell smaller than the macro cell in the macro cell, a communication terminal apparatus, and a base station control apparatus. The communication terminal apparatus moves from the macro cell to the femto cell and changes the connection destination from the macro base station apparatus to the home base station apparatus. Report the first tracking area to the home base station device, and the home base station device associates the reported first tracking area with the second tracking area of the home base station device to determine the location information of the local station. To the base station controller, and the base station controller uses the position information to identify the first track. If judged to include said the ring area second tracking area, the tracking area list, or to update the second tracking area.
　本発明によれば、ホーム基地局装置がマクロ基地局装置によって送信される報知情報に依ることなく、自局の設置位置を基地局制御装置に報告することができる。 According to the present invention, the home base station apparatus can report the installation position of its own station to the base station control apparatus without depending on the broadcast information transmitted by the macro base station apparatus.
本発明の実施の形態１に係る無線通信システムを示す図The figure which shows the radio | wireless communications system which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る通信端末装置の構成を示すブロック図The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係るホーム基地局装置の構成を示すブロック図The block diagram which shows the structure of the home base station apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る基地局制御装置の構成を示すブロック図The block diagram which shows the structure of the base station control apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る無線通信システムを示す図The figure which shows the radio | wireless communications system which concerns on Embodiment 2 of this invention. 本発明の実施の形態３に係る無線通信システムを示す図The figure which shows the radio | wireless communications system which concerns on Embodiment 3 of this invention. 本発明の実施の形態４に係る通信端末装置の構成を示すブロック図The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 4 of this invention.
　以下、本発明の実施の形態に係る無線通信システムについて図面を参照しながら説明する。 Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings.
　（実施の形態１）
　図１（図１Ａ，Ｂ）は、本実施の形態に係る無線通信システムを示す図である。 (Embodiment 1)
FIG. 1 (FIGS. 1A and 1B) is a diagram showing a wireless communication system according to the present embodiment.
　図１Ａに示すように、ｅＮＢ＃０のトラッキングエリアがＴＡ＃０で、ｅＮＢ＃１のトラッキングエリアがＴＡ＃１であり、ＴＡ＃０とＴＡ＃１が同一のＴＡリスト＃Ａに属するものとする。また、ＴＡ＃０の一部と重複するエリアにＨｅＮＢ＃２が設置されるものとする。ＨｅＮＢ＃２は自局の設置位置を認識できないため、ＭＭＥにより新たなＴＡリスト＃Ｃに属する新たなＴＡ＃２が割り当てられる。 As shown in FIG. 1A, the tracking area of eNB # 0 is TA # 0, the tracking area of eNB # 1 is TA # 1, and TA # 0 and TA # 1 belong to the same TA list #A. To do. Moreover, HeNB # 2 shall be installed in the area which overlaps with a part of TA # 0. Since HeNB # 2 cannot recognize the installation position of its own station, a new TA # 2 belonging to a new TA list #C is assigned by the MME.
　ｅＮＢ＃０が形成するマクロセルにはＵＥ＃００およびＵＥ＃０１が位置し、ｅＮＢ＃１が形成するマクロセルにはＵＥ＃１０が位置する。 UE # 00 and UE # 01 are located in the macro cell formed by eNB # 0, and UE # 10 is located in the macro cell formed by eNB # 1.
　ＵＥ＃００は、ｅＮＢ＃０のＴＡ＃０を含む報知情報をｅＮＢ＃０から受信する。ＵＥ＃００は、ｅＮＢ＃０が形成するマクロセルからＨｅＮＢ＃２が形成するフェムトセルへ移動してｅＮＢ＃０からＨｅＮＢ＃２へ接続先を変更するときに、ｅＮＢ＃０のＴＡ＃０をＨｅＮＢ＃２へ報告する。 UE # 00 receives broadcast information including TA # 0 of eNB # 0 from eNB # 0. When UE # 00 moves from the macro cell formed by eNB # 0 to the femto cell formed by HeNB # 2, and changes the connection destination from eNB # 0 to HeNB # 2, TA # 0 of eNB # 0 is changed to HeNB. Report to # 2.
　ＨｅＮＢ＃２は、ＵＥ＃００から報告されたＴＡ＃０と自局のＴＡであるＴＡ＃２とを関連付けて、自局の位置情報としてＴＡ＃０およびＴＡ＃２の双方をＭＭＥへ報告する。なお、ＨｅＮＢ＃２が自局のＴＡ（ＴＡ＃２）を事前にＭＭＥと共有できている場合は、ＨｅＮＢ＃２がこのタイミングでＭＭＥへ報告するのは、ＵＥ＃００から報告されたＴＡ＃０のみでもよい。 HeNB # 2 associates TA # 0 reported from UE # 00 with TA # 2 that is the TA of the local station, and reports both TA # 0 and TA # 2 to the MME as location information of the local station . In addition, when HeNB # 2 can share TA (TA # 2) of an own station with MME in advance, it is TA # reported from UE # 00 that HeNB # 2 reports to MME at this timing. Only 0 may be used.
　次いで、ＭＭＥは、ＨｅＮＢ＃２の位置情報として、ＨｅＮＢ＃２からＴＡ＃０およびＴＡ＃２の双方が報告されたため、ＨｅＮＢ＃２がＴＡ＃０のエリア内に設置されたと判断し、図１Ｂに示すように、ＴＡ＃０が属するＴＡリスト＃ＡにＴＡ＃２を登録してＴＡリスト＃Ａを更新するとともに、ＴＡリスト＃ＣからＴＡ＃２を削除してＴＡリスト＃Ｃを更新する。すなわち、ＭＭＥは、ＨｅＮＢ＃２からＴＡ＃０およびＴＡ＃２の双方が報告されたため、ＴＡ＃０にＴＡ＃２が含まれると判断してＴＡリストを更新する。これにより、ＨｅＮＢ＃２のＴＡは、ｅＮＢ＃０のＴＡが属するＴＡリストと同一のＴＡリストに属することになる。 Next, the MME determines that HeNB # 2 is installed in the area of TA # 0 because both TA # 0 and TA # 2 are reported from HeNB # 2 as the location information of HeNB # 2, and FIG. As shown in FIG. 4, TA # 2 is registered in TA list #A to which TA # 0 belongs to update TA list #A, and TA list #C is deleted from TA list #C to update TA list #C. . That is, since both TA # 0 and TA # 2 are reported from HeNB # 2, the MME determines that TA # 2 is included in TA # 0 and updates the TA list. As a result, the TA of HeNB # 2 belongs to the same TA list as the TA list to which the TA of eNB # 0 belongs.
　そして、ＭＭＥは、更新後のＴＡリストをｅＮＢ＃０、ｅＮＢ＃１、および、ＨｅＮＢ＃２に通知する。さらに、ＨｅＮＢ＃２は更新後のＴＡリストをＵＥ＃００に通知し、ｅＮＢ＃０は更新後のＴＡリストをＵＥ＃０１に通知し、ｅＮＢ＃１は更新後のＴＡリストをＵＥ＃１０に通知する。 And MME notifies updated TA list to eNB # 0, eNB # 1, and HeNB # 2. Furthermore, HeNB # 2 notifies the updated TA list to UE # 00, eNB # 0 notifies the updated TA list to UE # 01, and eNB # 1 transmits the updated TA list to UE # 10. Notice.
　このようしてＨｅＮＢ＃２がＵＥ＃００からＴＡ＃０の報告を受けることにより、ＨｅＮＢ＃２は、ｅＮＢ＃０によって送信される報知情報に依ることなく、自局の設置位置をＭＭＥに報告することができる。また、ＭＭＥはＨｅＮＢ＃２のＴＡ＃２をｅＮＢ＃０のＴＡ＃０が属するＴＡリスト＃Ａに含めるため、トラッキングエリアアップデートの頻発を防ぐことができる。 Thus, when HeNB # 2 receives the report of TA # 0 from UE # 00, HeNB # 2 reports the installation position of the own station to MME without depending on the broadcast information transmitted by eNB # 0. can do. Moreover, since MME includes TA # 2 of HeNB # 2 in TA list #A to which TA # 0 of eNB # 0 belongs, it is possible to prevent frequent occurrence of tracking area updates.
　次いで、本実施の形態に係る通信端末装置１０、ホーム基地局装置２０、および、基地局制御装置３０の構成について説明する。 Next, configurations of communication terminal apparatus 10, home base station apparatus 20, and base station control apparatus 30 according to the present embodiment will be described.
　まず、図２に本実施の形態に係る通信端末装置１０の構成を示す。 First, FIG. 2 shows a configuration of communication terminal apparatus 10 according to the present embodiment.
　通信端末装置１０において、無線受信部１２は、アンテナ１１を介して、マクロ基地局装置からの信号およびホーム基地局装置２０からの信号を受信して、ホーム基地局探索部１３、ＴＡ抽出部１４、および、ＴＡリスト抽出部１６に出力する。マクロ基地局装置からの信号には、マクロ基地局装置のＴＡを含む報知情報が含まれる。また、基地局制御装置３０によって生成されるＴＡリストは、マクロ基地局装置からの信号およびホーム基地局装置２０からの信号に含まれる。 In the communication terminal device 10, the radio reception unit 12 receives a signal from the macro base station device and a signal from the home base station device 20 via the antenna 11, and receives a home base station search unit 13 and a TA extraction unit 14. , And output to the TA list extraction unit 16. The signal from the macro base station apparatus includes broadcast information including the TA of the macro base station apparatus. Further, the TA list generated by the base station control device 30 is included in the signal from the macro base station device and the signal from the home base station device 20.
　ホーム基地局探索部１３は、通信端末装置１０の周辺に存在する、通信端末装置１０が接続可能なホーム基地局装置を探索する。すなわち、ホーム基地局探索部１３は、マクロ基地局装置からの信号の受信レベルおよびホーム基地局装置２０からの信号の受信レベルを測定し、通信端末装置１０の移動に伴って、ホーム基地局装置２０からの信号の受信レベルがマクロ基地局装置からの信号の受信レベルよりも良好であると判定したときに、通信端末装置１０の接続先がマクロ基地局装置からホーム基地局装置２０へ変更されると判断し、その旨をＴＡ抽出部１４に通知する。このように、ホーム基地局探索部１３は、ホーム基地局装置２０からの信号の受信レベルを用いてホーム基地局装置の探索を行う。 The home base station search unit 13 searches for a home base station device that is present around the communication terminal device 10 and is connectable to the communication terminal device 10. That is, the home base station search unit 13 measures the reception level of the signal from the macro base station apparatus and the reception level of the signal from the home base station apparatus 20, and the home base station apparatus moves as the communication terminal apparatus 10 moves. When the reception level of the signal from 20 is determined to be better than the reception level of the signal from the macro base station apparatus, the connection destination of the communication terminal apparatus 10 is changed from the macro base station apparatus to the home base station apparatus 20. And the TA extraction unit 14 is notified of this. As described above, the home base station search unit 13 searches for the home base station apparatus using the reception level of the signal from the home base station apparatus 20.
　ＴＡ抽出部１４は、ホーム基地局探索部１３からの通知に従って、マクロ基地局装置からの受信信号に含まれる報知情報からマクロ基地局装置のＴＡを抽出して無線送信部１５に出力する。 The TA extraction unit 14 extracts the TA of the macro base station device from the broadcast information included in the received signal from the macro base station device in accordance with the notification from the home base station search unit 13 and outputs the TA to the wireless transmission unit 15.
　無線送信部１５は、ＴＡ抽出部１４により抽出されたＴＡを、アンテナ１１を介してホーム基地局装置２０へ送信する。 The radio transmission unit 15 transmits the TA extracted by the TA extraction unit 14 to the home base station apparatus 20 via the antenna 11.
　ＴＡリスト抽出部１６は、受信信号からＴＡリストを抽出してＴＡリスト記憶部１７に出力する。 The TA list extraction unit 16 extracts the TA list from the received signal and outputs it to the TA list storage unit 17.
　ＴＡリスト記憶部１７は、ＴＡリスト抽出部１６から出力されたＴＡリストを記憶する。 The TA list storage unit 17 stores the TA list output from the TA list extraction unit 16.
　次いで、図３に本実施の形態に係るホーム基地局装置２０の構成を示す。 Next, FIG. 3 shows the configuration of home base station apparatus 20 according to the present embodiment.
　ホーム基地局装置２０において、無線受信部２２は、マクロ基地局装置のＴＡを含む信号を通信端末装置１０からアンテナ２１を介して受信して、位置情報生成部２３に出力する。 In the home base station apparatus 20, the radio reception unit 22 receives a signal including the TA of the macro base station apparatus from the communication terminal apparatus 10 via the antenna 21 and outputs the signal to the position information generation unit 23.
　位置情報生成部２３は、受信信号からマクロ基地局装置のＴＡを抽出し、マクロ基地局装置のＴＡと自局のＴＡとを関連付けて自局の位置情報を生成し、この位置情報をインタフェース部２４に出力する。 The position information generation unit 23 extracts the TA of the macro base station apparatus from the received signal, generates the position information of the own station by associating the TA of the macro base station apparatus and the TA of the own station, and uses the position information as an interface unit 24.
　インタフェース部２４は、位置情報生成部２３から出力された位置情報を基地局制御装置３０へ送信する。また、インタフェース部２４は、基地局制御装置３０から、基地局制御装置３０によって割り当てられたＴＡ、および、基地局制御装置３０によって生成されたＴＡリストを受信してＴＡリスト記憶部２５および無線送信部２６に出力する。 The interface unit 24 transmits the position information output from the position information generation unit 23 to the base station control device 30. Further, the interface unit 24 receives the TA allocated by the base station control device 30 and the TA list generated by the base station control device 30 from the base station control device 30, and transmits the TA list storage unit 25 and the wireless transmission. To the unit 26.
　ＴＡリスト記憶部２５は、インタフェース部２４から出力されたＴＡおよびＴＡリストを記憶する。 The TA list storage unit 25 stores the TA and the TA list output from the interface unit 24.
　無線送信部２６は、インタフェース部２４から出力されたＴＡおよびＴＡリストを通信端末装置１０へ送信する。 The wireless transmission unit 26 transmits the TA and the TA list output from the interface unit 24 to the communication terminal device 10.
　次いで、図４に本実施の形態に係る基地局制御装置３０の構成を示す。 Next, FIG. 4 shows the configuration of base station control apparatus 30 according to the present embodiment.
　基地局制御装置３０において、インタフェース部３１は、ホーム基地局装置２０から送信された位置情報を受信してＴＡリスト管理部３２に出力する。また、インタフェース部３１は、ＴＡリスト管理部３２から出力されるＴＡおよびＴＡリストをホーム基地局装置２０およびマクロ基地局装置へ送信する。 In the base station control device 30, the interface unit 31 receives the position information transmitted from the home base station device 20 and outputs it to the TA list management unit 32. Further, the interface unit 31 transmits the TA and the TA list output from the TA list management unit 32 to the home base station device 20 and the macro base station device.
　ＴＡリスト管理部３２は、ＴＡおよびＴＡリストを記憶しており、上記のように、ホーム基地局装置２０から送信された位置情報に基づいてＴＡリストを更新し、更新後のＴＡリストをインタフェース部３１に出力する。 The TA list management unit 32 stores the TA and the TA list. As described above, the TA list management unit 32 updates the TA list based on the location information transmitted from the home base station apparatus 20, and displays the updated TA list as an interface unit. To 31.
　なお、本実施の形態においては、ホーム基地局装置は、通信端末装置から報告される位置情報を、以前に報告された位置情報と異なる場合にのみ、基地局制御装置ＭＭＥへ報告してもよい。 In the present embodiment, the home base station apparatus may report the position information reported from the communication terminal apparatus to the base station control apparatus MME only when the position information is different from the previously reported position information. .
　（実施の形態２）
　本実施の形態では、基地局制御装置がＴＡリストを更新するのではなく、ホーム基地局装置から報告されたＴＡを更新する点において、実施の形態１と相違する。 (Embodiment 2)
The present embodiment is different from the first embodiment in that the base station control apparatus does not update the TA list but updates the TA reported from the home base station apparatus.
　図５（図５Ａ，Ｂ）は、本実施の形態に係る無線通信システムを示す図である。なお、図５Ａは図１Ａと同一であるため、説明を省略する。以下、図５Ｂにおいて、図１Ｂと異なる点についてのみ説明する。 FIG. 5 (FIGS. 5A and 5B) is a diagram showing a wireless communication system according to the present embodiment. Note that FIG. 5A is the same as FIG. Hereinafter, only differences from FIG. 1B in FIG. 5B will be described.
　ＭＭＥは、ＨｅＮＢ＃２の位置情報として、ＨｅＮＢ＃２からＴＡ＃０およびＴＡ＃２の双方が報告されたため、ＨｅＮＢ＃２がＴＡ＃０のエリア内に設置されたと判断し、図５Ｂに示すように、ＨｅＮＢ＃２から報告されたＴＡ＃２をＴＡ＃０に更新する。すなわち、ＭＭＥは、ＨｅＮＢ＃２からＴＡ＃０およびＴＡ＃２の双方が報告されたため、ＴＡ＃０にＴＡ＃２が含まれると判断してＴＡ＃２をＴＡ＃０に更新する。または、ＭＭＥは、ＴＡ＃２をＴＡ＃１に更新してもよい。つまり、ＭＭＥは、ＨｅＮＢ＃２のＴＡを、ｅＮＢ＃０のＴＡが属するＴＡリストに含まれるいずれかのＴＡに更新する。これにより、ＨｅＮＢ＃２のＴＡは、ｅＮＢ＃０のＴＡが属するＴＡリストと同一のＴＡリストに属することになる。 The MME determines that the HeNB # 2 is installed in the area of the TA # 0 because both the TA # 0 and the TA # 2 are reported from the HeNB # 2 as the location information of the HeNB # 2, and is shown in FIG. 5B. Thus, TA # 2 reported from HeNB # 2 is updated to TA # 0. That is, since both TA # 0 and TA # 2 are reported from HeNB # 2, the MME determines that TA # 2 is included in TA # 0 and updates TA # 2 to TA # 0. Alternatively, the MME may update TA # 2 to TA # 1. That is, the MME updates the TA of HeNB # 2 to any TA included in the TA list to which the TA of eNB # 0 belongs. As a result, the TA of HeNB # 2 belongs to the same TA list as the TA list to which the TA of eNB # 0 belongs.
　そして、ＭＭＥは、更新後のＴＡをＨｅＮＢ＃２に通知する。また、ＨｅＮＢ＃２は更新後のＴＡをＵＥ＃００に通知する。 And MME notifies TA after an update to HeNB # 2. Also, HeNB # 2 notifies the updated TA to UE # 00.
　このようしてＨｅＮＢ＃２がＵＥ＃００からＴＡ＃０の報告を受けることにより、ＨｅＮＢ＃２は、ｅＮＢ＃０によって送信される報知情報に依ることなく、自局の設置位置をＭＭＥに報告することができる。また、ＭＭＥはＨｅＮＢ＃２のＴＡをｅＮＢ＃０のＴＡと同一のＴＡに更新するため、トラッキングエリアアップデートの頻発を防ぐことができる。 Thus, when HeNB # 2 receives the report of TA # 0 from UE # 00, HeNB # 2 reports the installation position of the own station to MME without depending on the broadcast information transmitted by eNB # 0. can do. Further, since the MME updates the TA of HeNB # 2 to the same TA as that of eNB # 0, frequent occurrence of tracking area updates can be prevented.
　なお、本実施の形態では、基地局制御装置３０（図４）において、ＴＡリスト管理部３２は、ＴＡおよびＴＡリストを記憶しており、上記のように、ホーム基地局装置２０から送信された位置情報に基づいてＴＡを更新し、更新後のＴＡをインタフェース部３１に出力する。 In the present embodiment, in the base station control device 30 (FIG. 4), the TA list management unit 32 stores the TA and the TA list, and is transmitted from the home base station device 20 as described above. The TA is updated based on the position information, and the updated TA is output to the interface unit 31.
　（実施の形態３）
　本実施の形態では、更新後のＴＡリストにおいてＴＡ毎に、ホーム基地局装置のＴＡであるか否かを示す識別子、すなわち、マクロ基地局装置のＴＡとホーム基地局装置のＴＡとを区別する識別子を付与する点において、実施の形態１と相違する。 (Embodiment 3)
In the present embodiment, for each TA in the updated TA list, an identifier indicating whether the TA is the home base station apparatus, that is, the TA of the macro base station apparatus and the TA of the home base station apparatus are distinguished. The difference from Embodiment 1 is that an identifier is assigned.
　図６は、本実施の形態に係る無線通信システムを示す図である。以下、図６において、図１Ｂと異なる点についてのみ説明する。 FIG. 6 is a diagram showing a radio communication system according to the present embodiment. Hereinafter, only differences from FIG. 1B in FIG. 6 will be described.
　ＭＭＥは、更新後のＴＡリストにおいて、さらに、ＴＡ毎に、マクロ基地局装置のＴＡとホーム基地局装置のＴＡとを区別する識別子を付与する。図６において、ＴＡ＃０はｅＮＢ＃０のＴＡ、ＴＡ＃１はｅＮＢ＃１のＴＡ、ＴＡ＃２はＨｅＮＢ＃２のＴＡであるため、ＭＭＥは、ＴＡ＃０およびＴＡ＃１に対し、ホーム基地局装置のＴＡでないことを示す‘０’を付与する一方で、ＴＡ＃２に対し、ホーム基地局装置のＴＡであることを示す‘１’を付与する。 In the updated TA list, the MME further assigns an identifier for distinguishing between the TA of the macro base station apparatus and the TA of the home base station apparatus for each TA. In FIG. 6, since TA # 0 is TA of eNB # 0, TA # 1 is TA of eNB # 1, and TA # 2 is TA of HeNB # 2, MME is compared with TA # 0 and TA # 1. While “0” indicating that the TA is not the home base station apparatus is assigned, “1” indicating that the TA is the home base station apparatus is assigned to TA # 2.
　そして、ＭＭＥは、識別子付与後のＴＡリストをｅＮＢ＃０、ｅＮＢ＃１、および、ＨｅＮＢ＃２に通知する。さらに、ＨｅＮＢ＃２は識別子付与後のＴＡリストをＵＥ＃００に通知し、ｅＮＢ＃０は識別子付与後のＴＡリストをＵＥ＃０１に通知し、ｅＮＢ＃１は識別子付与後のＴＡリストをＵＥ＃１０に通知する。 And MME notifies TA list | wrist after an identifier provision to eNB # 0, eNB # 1, and HeNB # 2. Further, the HeNB # 2 notifies the UE list of the TA list after the identifier assignment, the eNB # 0 notifies the UE list of the TA list after the identifier assignment, and the eNB # 1 transmits the TA list after the identifier assignment to the UE. Notify # 10.
　識別子付与後のＴＡリストを受信したＵＥ＃００は、付与された識別子に基づいてＴＡリストの各ＴＡがマクロ基地局装置のＴＡであるか、ホーム基地局装置のＴＡであるかを判断し、ＴＡ＃０からＴＡ＃２への移動時にはトラッキングエリアアップデートを行う一方で、ＴＡ＃２からＴＡ＃０への移動時にはトラッキングエリアアップデートを行わない。すなわち、ＵＥ＃００は、マクロ基地局装置のＴＡからホーム基地局装置のＴＡへの移動時にはトラッキングエリアアップデートを行い、ホーム基地局装置のＴＡからマクロ基地局装置のＴＡへの移動時にはトラッキングエリアアップデートを行わない。よって、ＵＥ＃００は、ＨｅＮＢ＃２を介してＭＭＥに対し、マクロ基地局装置のＴＡからホーム基地局装置のＴＡへの移動時にはトラッキングエリアアップデート要求を送信し、ホーム基地局装置のＴＡからマクロ基地局装置のＴＡへの移動時にはトラッキングエリアアップデート要求を送信しない。 The UE # 00 that has received the TA list after the identifier assignment determines whether each TA in the TA list is the TA of the macro base station apparatus or the TA of the home base station apparatus based on the assigned identifier. While tracking area update is performed when moving from TA # 0 to TA # 2, tracking area update is not performed when moving from TA # 2 to TA # 0. That is, UE # 00 performs tracking area update when moving from the TA of the macro base station apparatus to the TA of the home base station apparatus, and updates tracking area when moving from the TA of the home base station apparatus to the TA of the macro base station apparatus. Do not do. Therefore, UE # 00 transmits a tracking area update request to the MME via the HeNB # 2 when moving from the TA of the macro base station apparatus to the TA of the home base station apparatus, and the macro of the home base station apparatus When the base station apparatus moves to the TA, a tracking area update request is not transmitted.
　よって、本実施の形態によれば、ＭＭＥは、ＵＥ＃００がＨｅＮＢ＃２が形成するフェムトセルに移動したことを検知することができるため、ｅＮＢ＃０の容量負荷を管理することができる。 Therefore, according to the present embodiment, the MME can detect that the UE # 00 has moved to the femto cell formed by the HeNB # 2, and thus can manage the capacity load of the eNB # 0.
　また、本実施の形態によれば、ホーム基地局装置のＴＡからマクロ基地局装置のＴＡへの移動時にはトラッキングエリアアップデートが行われないため、多くの通信端末装置が在圏するマクロセルでのリソースロスを低減することができる。 Also, according to the present embodiment, since the tracking area update is not performed when moving from the TA of the home base station apparatus to the TA of the macro base station apparatus, resource loss in a macro cell in which many communication terminal apparatuses are located Can be reduced.
　また、本実施の形態では、（１）ホーム基地局装置のＴＡ宛→（２）マクロ基地局装置のＴＡ宛の順にページングを送信することにより、フェムトセルに通信端末装置が在圏している場合にはマクロ基地局装置からのページングを停止できるため、ページング負荷を低減することができる。 Further, in this embodiment, the communication terminal apparatus is located in the femtocell by transmitting paging in the order of (1) TA addressed to home base station apparatus → (2) TA addressed to macro base station apparatus. In this case, since paging from the macro base station apparatus can be stopped, the paging load can be reduced.
　さらに、本実施の形態によれば、フェムトセルに通信端末装置が在圏しているか否かを判別することができるため、フェムトセルに通信端末装置が在圏していない場合にはホーム基地局装置をスリープさせて電力消費を低減することができる。 Furthermore, according to the present embodiment, it is possible to determine whether or not the communication terminal apparatus is located in the femtocell. Therefore, if the communication terminal apparatus is not located in the femtocell, the home base station The device can be put to sleep to reduce power consumption.
　（実施の形態４）
　本実施の形態では、通信端末装置が、マクロ基地局装置のＴＡとホーム基地局装置のＴＡとを関連付けて記憶しておく点において、実施の形態１と相違する。 (Embodiment 4)
The present embodiment is different from the first embodiment in that the communication terminal apparatus stores the macro base station apparatus TA and the home base station apparatus TA in association with each other.
　図７に本実施の形態に係る通信端末装置４０の構成を示す。なお、図７において、図２（実施の形態１）と同一の構成には同一の符合を付し、説明を省略する。 FIG. 7 shows the configuration of communication terminal apparatus 40 according to the present embodiment. In FIG. 7, the same components as those in FIG. 2 (Embodiment 1) are denoted by the same reference numerals, and the description thereof is omitted.
　図７に示す通信端末装置４０において、無線受信部１２がマクロ基地局装置から受信する信号には、マクロ基地局装置のＴＡを含む報知情報が含まれる。また、無線受信部１２がホーム基地局装置から受信する信号には、ホーム基地局装置のＴＡが含まれる。 In the communication terminal device 40 shown in FIG. 7, the signal received by the wireless reception unit 12 from the macro base station device includes broadcast information including the TA of the macro base station device. Further, the signal received by the wireless reception unit 12 from the home base station apparatus includes the TA of the home base station apparatus.
　ＴＡ抽出部４１は、ホーム基地局探索部４２からの通知に従って、マクロ基地局装置からの受信信号に含まれる報知情報からマクロ基地局装置のＴＡを抽出して無線送信部１５およびＴＡリスト記憶部４３に出力する。また、ＴＡ抽出部４１は、ホーム基地局装置からの受信信号に含まれるホーム基地局装置のＴＡを抽出してＴＡリスト記憶部４３に出力する。さらに、ＴＡ抽出部４１は、マクロ基地局装置からの受信信号を入力される度に、受信信号に含まれる報知情報からマクロ基地局装置のＴＡを抽出してホーム基地局探索部４２に出力する。 The TA extraction unit 41 extracts the TA of the macro base station device from the broadcast information included in the received signal from the macro base station device in accordance with the notification from the home base station search unit 42, and the wireless transmission unit 15 and the TA list storage unit Output to 43. Further, the TA extraction unit 41 extracts the TA of the home base station device included in the received signal from the home base station device, and outputs it to the TA list storage unit 43. Further, each time the reception signal from the macro base station apparatus is input, the TA extraction unit 41 extracts the TA of the macro base station apparatus from the broadcast information included in the reception signal and outputs the TA to the home base station search unit 42. .
　ＴＡリスト記憶部４３は、実施の形態１同様、ＴＡリスト抽出部１６から出力されたＴＡリストを記憶する。また、ＴＡリスト記憶部４３は、マクロ基地局装置のＴＡとホーム基地局装置のＴＡとを関連付けて記憶する。 The TA list storage unit 43 stores the TA list output from the TA list extraction unit 16 as in the first embodiment. Further, the TA list storage unit 43 stores the TA of the macro base station apparatus and the TA of the home base station apparatus in association with each other.
　ホーム基地局探索部４２は、ＴＡリスト記憶部４３を参照し、ホーム基地局装置のＴＡと関連付けられたマクロ基地局装置のＴＡと、ＴＡ抽出部４１から入力されたマクロ基地局装置のＴＡとを比較して、ホーム基地局装置の探索を行うか否かを決定する。 The home base station search unit 42 refers to the TA list storage unit 43, refers to the TA of the macro base station device associated with the TA of the home base station device, and the TA of the macro base station device input from the TA extraction unit 41. To determine whether to search for the home base station apparatus.
　すなわち、ホーム基地局探索部４２は、ＴＡ抽出部４１から入力されたマクロ基地局装置のＴＡが、ＴＡリスト記憶部４３においてホーム基地局装置のＴＡと関連付けられている場合は、通信端末装置４０が在圏しているマクロセル内にホーム基地局装置が存在すると判断し、ホーム基地局装置の探索を行う。一方で、ホーム基地局探索部４２は、ＴＡ抽出部４１から入力されたマクロ基地局装置のＴＡが、ＴＡリスト記憶部４３においてホーム基地局装置のＴＡと関連付けられていない場合は、通信端末装置４０が在圏しているマクロセル内にホーム基地局装置が存在しないと判断し、ホーム基地局装置の探索を停止する。つまり、ホーム基地局探索部４２は、報知情報に含まれるＴＡがホーム基地局装置のＴＡと関連付けられているか否かに応じて、ホーム基地局装置の探索を行うか否かを決定する。 That is, when the TA of the macro base station apparatus input from the TA extraction unit 41 is associated with the TA of the home base station apparatus in the TA list storage unit 43, the home base station search unit 42 It is determined that there is a home base station apparatus in the macro cell where the mobile station is located, and the home base station apparatus is searched. On the other hand, when the TA of the macro base station apparatus input from the TA extraction unit 41 is not associated with the TA of the home base station apparatus in the TA list storage unit 43, the home base station search unit 42 It is determined that there is no home base station device in the macro cell in which 40 is located, and the search for the home base station device is stopped. That is, the home base station search unit 42 determines whether to search for the home base station apparatus according to whether the TA included in the broadcast information is associated with the TA of the home base station apparatus.
　例えば、上記図１Ａにおいて、ＵＥ＃００が本実施の形態に係る通信端末装置４０であり、ＵＥ＃００がｅＮＢ＃０が形成するマクロセルに位置する場合、ＴＡリスト記憶部４３には、ｅＮＢ＃０のＴＡ＃０とＨｅＮＢ＃２のＴＡ＃２とが関連付けられて記憶される。そして、ＵＥ＃００がｅＮＢ＃１が形成するマクロセルに移動した場合には、ＴＡ抽出部４１によりｅＮＢ＃１のＴＡ＃１が抽出されてホーム基地局探索部４２に入力される。ＴＡ＃１はＴＡリスト記憶部４３においてホーム基地局装置のＴＡ＃２と関連付けられていないため、この場合にはホーム基地局探索部４２はホーム基地局装置の探索を停止する。 For example, in FIG. 1A, when UE # 00 is communication terminal apparatus 40 according to the present embodiment and UE # 00 is located in a macro cell formed by eNB # 0, TA list storage unit 43 includes eNB # TA # 0 of 0 and TA # 2 of HeNB # 2 are stored in association with each other. And when UE # 00 moves to the macro cell which eNB # 1 forms, TA # 1 of eNB # 1 is extracted by the TA extraction part 41, and is input into the home base station search part 42. FIG. Since TA # 1 is not associated with TA # 2 of the home base station device in the TA list storage unit 43, in this case, the home base station search unit 42 stops searching for the home base station device.
　このように、本実施の形態によれば、通信端末装置は、ホーム基地局装置が存在しないマクロセルに在圏しているとき、ホーム基地局装置の探索を停止することができるため、通信端末装置の消費電力を低減することができる。 Thus, according to the present embodiment, the communication terminal apparatus can stop searching for the home base station apparatus when the communication terminal apparatus is located in a macro cell where the home base station apparatus does not exist. Power consumption can be reduced.
　なお、通信端末装置は、ホーム基地局装置が存在しないマクロセルに在圏しているとき、ホーム基地局装置の探索の優先度を下げてもよい。 Note that the communication terminal apparatus may lower the search priority of the home base station apparatus when the communication terminal apparatus is in a macro cell where the home base station apparatus does not exist.
　以上、本発明の実施の形態について説明した。 The embodiment of the present invention has been described above.
　なお、上記位置情報には、通信端末装置が直前に在圏したセルのＰＣＩ（Physical Cell ID）、通信端末装置が直前に在圏したセルの周辺セル情報、または、通信端末装置が直前に在圏したセルおよび周辺セルの受信電力、を含めてもよい。 The location information includes the PCI (Physical Cell ID) of the cell where the communication terminal device is located immediately before, the neighboring cell information of the cell where the communication terminal device was located immediately before, or the communication terminal device is located immediately before. You may include the reception power of the cell and the surrounding cell.
　また、本発明は、ＬＴＥ／ＳＡＥシステム以外の無線通信システムにも上記同様にして適用可能である。 Further, the present invention can be applied to a wireless communication system other than the LTE / SAE system in the same manner as described above.
　また、本発明は、ホーム基地局装置を新たに設置する場合に限らず、フェムト基地局装置またはマクロ基地局装置を新たに設置する場合においても上記同様にして実施することができる。 Further, the present invention is not limited to the case where a home base station apparatus is newly installed, but can be implemented in the same manner as described above when a femto base station apparatus or a macro base station apparatus is newly installed.
　２０１１年６月２２日出願の特願２０１１－１３８３６１の日本出願に含まれる明細書、図面及び要約書の開示内容は、すべて本願に援用される。 The disclosure of the specification, drawings and abstract contained in the Japanese application of Japanese Patent Application No. 2011-138361 filed on June 22, 2011 is incorporated herein by reference.
　本発明は、ホーム基地局装置の設置位置を管理する無線通信システム等に好適である。 The present invention is suitable for a wireless communication system that manages the installation position of a home base station apparatus.
　１０　通信端末装置
　２０　ホーム基地局装置
　２３　位置情報生成部
　２４　インタフェース部
　３０　基地局制御装置
  DESCRIPTION OF SYMBOLS 10 Communication terminal device 20 Home base station apparatus 23 Location information generation part 24 Interface part 30 Base station control apparatus

Claims (6)

  1. 　マクロセルを形成するマクロ基地局装置と、前記マクロセル内において前記マクロセルより小さいフェムトセルを形成するホーム基地局装置と、通信端末装置と、基地局制御装置と、を具備する無線通信システムであって、
    　前記通信端末装置は、
    　前記マクロセルから前記フェムトセルへ移動して前記マクロ基地局装置から前記ホーム基地局装置へ接続先を変更するときに、前記マクロ基地局装置の第１トラッキングエリアを前記ホーム基地局装置へ報告し、
    　前記ホーム基地局装置は、
    　報告された前記第１トラッキングエリアと、前記ホーム基地局装置の第２トラッキングエリアとを関連付けて自局の位置情報として前記基地局制御装置へ報告し、
    　前記基地局制御装置は、
    　前記位置情報により、前記第１トラッキングエリアに前記第２トラッキングエリアが含まれると判断する場合に、トラッキングエリアリスト、または、前記第２トラッキングエリアを更新する、
    　無線通信システム。     A wireless communication system comprising: a macro base station device that forms a macro cell; a home base station device that forms a femto cell smaller than the macro cell in the macro cell; a communication terminal device; and a base station control device,
    The communication terminal device
    When moving from the macro cell to the femto cell and changing the connection destination from the macro base station apparatus to the home base station apparatus, the first tracking area of the macro base station apparatus is reported to the home base station apparatus,
    The home base station device
    Report the reported first tracking area and the second tracking area of the home base station device to the base station control device as location information of the own station,
    The base station controller is
    When the position information determines that the second tracking area is included in the first tracking area, the tracking area list or the second tracking area is updated.
    Wireless communication system.
  2. 　前記基地局制御装置は、
    　前記第１トラッキングエリアが属するトラッキングエリアリストに前記第２トラッキングエリアを登録してトラッキングエリアリストを更新する、
    　請求項１記載の無線通信システム。     The base station controller is
    Registering the second tracking area in the tracking area list to which the first tracking area belongs, and updating the tracking area list;
    The wireless communication system according to claim 1.
  3. 　前記基地局制御装置は、更新後のトラッキングエリアリストに、マクロ基地局装置のトラッキングエリアとホーム基地局装置のトラッキングエリアとを区別する識別子を付与する、
    　請求項２記載の無線通信システム。     The base station control device gives an identifier for distinguishing the tracking area of the macro base station device and the tracking area of the home base station device to the updated tracking area list,
    The wireless communication system according to claim 2.
  4. 　前記基地局制御装置は、
    　前記第２トラッキングエリアを前記第１トラッキングエリアに更新する、
    　請求項１記載の無線通信システム。     The base station controller is
    Updating the second tracking area to the first tracking area;
    The wireless communication system according to claim 1.
  5. 　マクロ基地局装置が形成するマクロセル内において前記マクロセルより小さいフェムトセルを形成するホーム基地局装置であって、
    　通信端末装置から報告された前記マクロ基地局装置の第１トラッキングエリアと、自局の第２トラッキングエリアとを関連付けて自局の位置情報を生成する生成手段と、
    　前記位置情報を基地局制御装置へ送信するインタフェース手段と、
    　を具備するホーム基地局装置。     A home base station apparatus that forms a femto cell smaller than the macro cell in a macro cell formed by the macro base station apparatus,
    Generating means for associating the first tracking area of the macro base station apparatus reported from the communication terminal apparatus with the second tracking area of the own station, and generating position information of the own station;
    Interface means for transmitting the position information to a base station controller;
    A home base station apparatus comprising:
  6. 　マクロセルを形成するマクロ基地局装置の第１トラッキングエリアと、前記マクロセル内において前記マクロセルより小さいフェムトセルを形成するホーム基地局装置の第２トラッキングエリアとを関連付けて記憶する記憶手段と、
    　報知情報に含まれるトラッキングエリアが前記記憶手段において前記第２トラッキングエリアと関連付けられているか否かに応じて、前記ホーム基地局装置の探索を行うか否かを決定する探索手段と、
    　を具備する通信端末装置。     Storage means for associating and storing a first tracking area of a macro base station apparatus forming a macro cell and a second tracking area of a home base station apparatus forming a femto cell smaller than the macro cell in the macro cell;
    Search means for determining whether or not to search for the home base station device according to whether or not a tracking area included in broadcast information is associated with the second tracking area in the storage means;
    A communication terminal device comprising:
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WO2009022533A1 (en) * 2007-08-13 2009-02-19 Ntt Docomo, Inc. Mobile communication system, upper node device, base station device, mobile station device, and base station status control method
WO2011052779A1 (en) * 2009-11-02 2011-05-05 株式会社エヌ・ティ・ティ・ドコモ Mobile communication method, wireless base station, exchange, and mobile station

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WO2009022533A1 (en) * 2007-08-13 2009-02-19 Ntt Docomo, Inc. Mobile communication system, upper node device, base station device, mobile station device, and base station status control method
WO2011052779A1 (en) * 2009-11-02 2011-05-05 株式会社エヌ・ティ・ティ・ドコモ Mobile communication method, wireless base station, exchange, and mobile station

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