JP2015008407A - Radio communication system, radio base station control device and radio communication method - Google Patents

Radio communication system, radio base station control device and radio communication method Download PDF

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JP2015008407A
JP2015008407A JP2013132878A JP2013132878A JP2015008407A JP 2015008407 A JP2015008407 A JP 2015008407A JP 2013132878 A JP2013132878 A JP 2013132878A JP 2013132878 A JP2013132878 A JP 2013132878A JP 2015008407 A JP2015008407 A JP 2015008407A
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base station
radio base
radio
station apparatus
handover
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JP6147586B2 (en
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和也 根岸
Kazuya Negishi
和也 根岸
健一 大野
Kenichi Ono
健一 大野
太一 田代
Taichi Tashiro
太一 田代
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Toshiba Corp
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Abstract

PROBLEM TO BE SOLVED: To achieve effective use of a radio resource by reducing a load on a center device.SOLUTION: A radio communication system according to the present embodiment comprises: a plurality of first radio base station devices which perform radio communication with a radio terminal device; and a radio base station control device which manages the plurality of first radio base station devices and which can be connected to a second radio base station device outside the management through a core network. The radio base station control device includes storage means for storing radio base station information for identifying the plurality of first radio base station devices; and control signal control means that, in a case of receiving a request signal of handover transmitted from a first radio base station device, when the handover destination is another first radio base station device, transmits a response signal for permitting the handover to the first radio base station device which has transmitted the request signal, on the basis of the radio base station device information and, when the handover destination is the second radio base station device, transfers the request signal to the core network.

Description

本発明の実施形態は、無線通信システム、無線基地局制御装置及び無線通信方法に関する。   Embodiments described herein relate generally to a wireless communication system, a wireless base station control device, and a wireless communication method.

ＬＴＥ対応のスマートフォン、タブレット、ＷｉＦｉルータの増加に伴い、ＬＴＥを利用した通信が増大しており、コアネットワーク側に配置されたＭＭＥやＳ−ＧＷといったセンター装置の負荷が増大している。   With the increase in LTE-compatible smartphones, tablets, and WiFi routers, communication using LTE is increasing, and the load on center devices such as MME and S-GW arranged on the core network side is increasing.

なお、従来では、複数の近接する無線基地局装置を統括する統括局などを配置し、統括局内の無線基地局装置で発生したハンドオーバについては、センター装置に対して制御信号を抑制する技術が提案されている（例えば、特許文献１または２を参照）。   Conventionally, a technology has been proposed in which a control station that supervises a plurality of adjacent radio base station devices is arranged, and a control signal is suppressed with respect to the center device for a handover that occurs in the radio base station device in the control station. (For example, see Patent Document 1 or 2).

特開２００１−４５５３４号公報JP 2001-45534 A 特開２００２−３５４５２３号公報JP 2002-354523 A

しかしながら、上記のような従来技術では、統括局などをまたぐハンドオーバ発生時の制御信号の抑制については何ら考慮されておらず、このような場合には不要な制御信号がセンター装置に送信される可能性がある。   However, in the conventional technology as described above, no consideration is given to the suppression of control signals at the time of handover occurring across control stations, and in such cases, unnecessary control signals can be transmitted to the center device. There is sex.

本実施形態の目的は、センター装置への負荷を軽減し、無線リソースの有効活用を図ることができる無線通信システム、無線基地局制御装置及び無線通信方法を提供することにある。   An object of the present embodiment is to provide a radio communication system, a radio base station control apparatus, and a radio communication method that can reduce a load on a center apparatus and can effectively use radio resources.

本実施形態に係る無線通信システムの一態様は、無線端末装置と無線通信を行う複数の第１の無線基地局装置と、前記複数の第１の無線基地局装置を管理し、コアネットワークを介して管理外の第２の無線基地局装置と接続可能な無線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、前記無線基地局制御装置は、前記複数の第１の無線基地局装置を識別する無線基地局装置情報を記憶する記憶手段と、前記第１の無線基地局装置が送信したハンドオーバの要求信号を受信した場合に、前記無線基地局装置情報に基づいて、ハンドオーバ先が他の前記第１の無線基地局装置である場合は前記要求信号を送信した前記第１の無線基地局装置へハンドオーバを許可する応答信号を送信し、ハンドオーバ先が前記第２の無線基地局装置である場合は前記要求信号を前記コアネットワークに転送する制御信号制御手段とを備えるものである。   One aspect of the wireless communication system according to the present embodiment manages a plurality of first wireless base station devices that perform wireless communication with a wireless terminal device, and the plurality of first wireless base station devices, via a core network. A radio base station control device connectable to a second radio base station device that is not managed, wherein the radio base station control device includes the plurality of first radio base station devices. When receiving a handover request signal transmitted by the first radio base station apparatus and a storage means for storing the radio base station apparatus information to be identified, the handover destination is determined based on the radio base station apparatus information. In the case of the first radio base station apparatus, a response signal permitting handover is transmitted to the first radio base station apparatus that has transmitted the request signal, and the handover destination is the second radio base station apparatus If is one and a control signal controlling means for transferring said request signal to the core network.

本実施形態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 this embodiment. 本実施形態に係る無線通信システムの機能構成を示すブロック図。The block diagram which shows the function structure of the radio | wireless communications system which concerns on this embodiment. 無線基地局装置の配置関係を示す図。The figure which shows the arrangement | positioning relationship of a wireless base station apparatus. 実施例１に係る無線基地局装置情報を示す図。The figure which shows the wireless base station apparatus information which concerns on Example 1. FIG. 実施例１に係るハンドオーバ処理を示すシーケンス図。FIG. 3 is a sequence diagram illustrating handover processing according to the first embodiment. 実施例２に係る無線基地局装置情報を示す図。The figure which shows the wireless base station apparatus information which concerns on Example 2. FIG. 実施例２に係るハンドオーバ処理を示すシーケンス図。FIG. 10 is a sequence diagram illustrating handover processing according to the second embodiment.

以下、図面を参照しながら本実施形態に係る無線通信システム、無線基地局制御装置及び無線通信方法について説明する。   Hereinafter, a radio communication system, a radio base station control device, and a radio communication method according to the present embodiment will be described with reference to the drawings.

図１に、本実施形態に係る無線通信システムの構成例を示す。この無線通信システムは、無線端末装置１、無線基地局装置２−１〜２−ｎ，２´−１，２´−２、無線基地局制御装置３、およびコアネットワークＮＷを備える。無線基地局装置２−１〜２−ｎ（以下、無線基地局装置２と総称する）は、無線基地局制御装置３の管理下の無線基地局装置であって、無線基地局制御装置３を介してコアネットワークＮＷに接続される。一方、無線基地局装置２´−１，２´−２（以下、無線基地局装置２´と総称する）は、無線基地局制御装置３の管理外の無線基地局装置であって、コアネットワークＮＷに直接接続される形態、又は、他の無線基地局制御装置を介してコアネットワークＮＷに接続される形態とする。また、ここでは図示は省略するが、コアネットワークＮＷの先には通常通信事業者が保有する各種センター装置が接続されている。コアネットワークＮＷについては、ＩＰ（Internet Protocol）網やＩＳＤＮ（Integrated Services Digital Network）網といった回線種別、通信プロトコルは問わず、各装置間で任意の通信が可能であればよい。   FIG. 1 shows a configuration example of a wireless communication system according to this embodiment. This wireless communication system includes a wireless terminal device 1, wireless base station devices 2-1 to 2-n, 2'-1, 2'-2, a wireless base station control device 3, and a core network NW. The radio base station apparatuses 2-1 to 2-n (hereinafter collectively referred to as radio base station apparatus 2) are radio base station apparatuses managed by the radio base station control apparatus 3, and the radio base station control apparatus 3 is Via the core network NW. On the other hand, the radio base station apparatuses 2′-1, 2′-2 (hereinafter collectively referred to as radio base station apparatus 2 ′) are radio base station apparatuses not managed by the radio base station control apparatus 3, and are core networks. A form directly connected to the NW or a form connected to the core network NW via another radio base station controller. Further, although not shown here, various center devices owned by a normal communication carrier are connected to the end of the core network NW. The core network NW is not limited to any line type or communication protocol, such as an IP (Internet Protocol) network or an ISDN (Integrated Services Digital Network) network, as long as arbitrary communication is possible between the devices.

図２は、本実施形態に係る無線通信システムの機能構成を示すブロック図である。なお、無線端末装置１、及び無線基地局装置２において、通話機能、データ通信機能や、保守機能などを実現するにあたり一般の機能は有しているものとし、図示は省略する。   FIG. 2 is a block diagram showing a functional configuration of the wireless communication system according to the present embodiment. The wireless terminal device 1 and the wireless base station device 2 are assumed to have general functions for realizing a call function, a data communication function, a maintenance function, and the like, and illustration thereof is omitted.

無線端末装置１は、無線通信部１１、品質測定部１２、及び品質レポート部１３を備える。無線通信部１１は、無線基地局装置２と無線で通信をするための制御部であり、無線一般にかかる制御を行う。無線端末装置１は無線通信部１１を通じて、通話や、パケット通信を行うことができる。品質測定部１２は、無線端末装置１が受信している電波状況（電波が到達している全ての無線基地局装置２のＩＤと電波強度の組などの情報）を測定する。品質レポート部１３は、品質測定部１２にて測定した電波状況を示す無線品質情報を定期的に無線基地局装置２に通知する。   The wireless terminal device 1 includes a wireless communication unit 11, a quality measurement unit 12, and a quality report unit 13. The radio communication unit 11 is a control unit for performing radio communication with the radio base station apparatus 2 and performs control related to radio in general. The wireless terminal device 1 can perform a call or packet communication through the wireless communication unit 11. The quality measurement unit 12 measures the radio wave condition received by the wireless terminal device 1 (information such as a set of IDs and radio field strengths of all the radio base station devices 2 that the radio wave has reached). The quality report unit 13 periodically notifies the radio base station apparatus 2 of radio quality information indicating the radio wave status measured by the quality measurement unit 12.

無線基地局装置２は、無線通信部２１、品質レポート受信部２２、ハンドオーバ制御部２３、及び有線通信部２４を備える。無線通信部２１は、無線端末装置１と無線で通信をするための制御部であり、無線一般にかかる制御を行う。品質レポート受信部２２は、無線端末装置１からレポートされる無線品質情報を受信する。ハンドオーバ制御部２３は、品質レポート受信部２２にて受信した無線端末装置１の無線品質情報を考慮し、ハンドオーバすべき無線基地局装置がある場合には、無線基地局制御装置３を介してセンター装置側に対してハンドオーバを要求するメッセージを送信する制御部である。有線通信部２４は、無線基地局制御装置３、またはコアネットワークＮＷと有線で接続するための制御部である。   The radio base station device 2 includes a radio communication unit 21, a quality report reception unit 22, a handover control unit 23, and a wired communication unit 24. The wireless communication unit 21 is a control unit for performing wireless communication with the wireless terminal device 1 and performs control related to wireless communication in general. The quality report receiving unit 22 receives wireless quality information reported from the wireless terminal device 1. The handover control unit 23 considers the radio quality information of the radio terminal device 1 received by the quality report reception unit 22, and if there is a radio base station device to be handed over, It is a control part which transmits the message which requests | requires a hand-over with respect to the apparatus side. The wired communication unit 24 is a control unit for connecting to the radio base station control device 3 or the core network NW by wire.

無線基地局制御装置３は、基地局通信部３１、センター通信部３２、制御信号制御部３３、及び無線基地局装置情報３４を備える。基地局通信部３１は、無線基地局装置２と有線で接続するための制御部である。センター通信部３２は、コアネットワークＮＷと有線で接続するための制御部である。   The radio base station control device 3 includes a base station communication unit 31, a center communication unit 32, a control signal control unit 33, and radio base station device information 34. The base station communication unit 31 is a control unit for connecting to the radio base station device 2 by wire. The center communication unit 32 is a control unit for connecting to the core network NW by wire.

制御信号制御部３３は、無線基地局装置２からハンドオーバを要求する制御信号を受信した場合に、その制御信号に含まれるハンドオーバ先の無線基地局装置が当該無線基地局制御装置３の管理下か管理外かでメッセージの振り分けを行い、管理下であると判断した場合には制御信号を終端し、ハンドオーバにかかる制御信号をコアネットワーク側へ送信せず、ハンドオーバ処理を完了させる。   When the control signal control unit 33 receives a control signal requesting handover from the radio base station apparatus 2, is the handover destination radio base station apparatus included in the control signal managed by the radio base station control apparatus 3? The message is distributed outside the management, and if it is determined that the message is under management, the control signal is terminated, the control signal for handover is not transmitted to the core network side, and the handover process is completed.

無線基地局装置情報３４には、自身の配下で管理される無線基地局装置２に関する情報が記憶される。例えば、３つの無線基地局装置２が無線基地局制御装置３と接続されていれば、これら３つの無線基地局装置２を示す情報を保持する。また、実施する形態に応じて、無線基地局装置情報３４は、自装置が管理する無線基地局装置と管理外の無線基地局装置との隣接関係を示す情報をさらに保持することもできる。   The wireless base station device information 34 stores information related to the wireless base station device 2 managed under its control. For example, if three radio base station devices 2 are connected to the radio base station control device 3, information indicating these three radio base station devices 2 is held. Further, according to the embodiment, the radio base station apparatus information 34 can further hold information indicating the adjacency relationship between the radio base station apparatus managed by the own apparatus and the radio base station apparatus that is not managed.

次に、このように構成される無線通信システムの動作を、各実施例に従って説明する。   Next, the operation of the wireless communication system configured as described above will be described according to each embodiment.

（実施例１）
図３は、本実施例に係る無線基地局装置の配置関係を示している。図３では、ビル内に無線基地局制御装置３によって管理される８つの無線基地局装置２−１〜２−８（無線基地局装置Ａ〜Ｈ）が置かれ、ビル外に無線基地局制御装置３に管理されない無線基地局装置２´（屋外無線基地局装置）が置かれている。また、無線基地局制御装置３が保持する無線基地局装置情報３４は、図４に示すように、自装置が管理する８つの無線基地局装置の情報を保持する。 Example 1
FIG. 3 shows the arrangement relationship of the radio base station apparatus according to the present embodiment. In FIG. 3, eight radio base station apparatuses 2-1 to 2-8 (radio base station apparatuses A to H) managed by the radio base station control apparatus 3 are placed in the building, and the radio base station control is performed outside the building. A radio base station device 2 ′ (outdoor radio base station device) that is not managed by the device 3 is placed. Further, as shown in FIG. 4, the radio base station apparatus information 34 held by the radio base station control apparatus 3 holds information on eight radio base station apparatuses managed by the own apparatus.

図５は、実施例１に係るハンドオーバ処理を示すシーケンスである。ここで、通信中の無線端末装置１が無線基地局装置Ｄの配下に存在し、無線基地局装置Ｃ、無線基地局装置Ａを経由してビルの外に移動し、屋外無線基地局装置にハンドオーバするケースを考える。   FIG. 5 is a sequence illustrating the handover process according to the first embodiment. Here, the wireless terminal device 1 in communication exists under the control of the wireless base station device D, moves outside the building via the wireless base station device C and the wireless base station device A, and becomes an outdoor wireless base station device. Consider the case of handover.

無線端末装置１が無線基地局装置Ｃに近づくと、無線基地局装置Ｄのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ１０１）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ１０２）、無線基地局装置Ｃにハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ１０３）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、無線基地局装置情報３４に基づいてハンドオーバ先が自身で管理している無線基地局装置であると判断して（ステップＳ１０４）、無線基地局装置Ｄへハンドオーバを許可するハンドオーバ応答（ＯＫ）を送信し（ステップＳ１０５）、コアネットワーク側へ制御信号を一切送信せず、自身でハンドオーバに関するメッセージを終端し、無線基地局装置Ｃへのハンドオーバ処理を完了させる。無線基地局制御装置３の制御信号制御部３３は、この処理の後にコアネットワーク側から受信するデータ信号は無線基地局装置Ｃ側へ送信するように変更する。無線端末装置１の無線通信部１１は、無線基地局装置Ｄから送信されるハンドオーバ指示（ステップＳ１０６）に従って、無線基地局装置Ｄから無線基地局装置Ｃへハンドオーバ処理を行う（ステップＳ１０７）。   When the wireless terminal device 1 approaches the wireless base station device C, the handover control unit 23 of the wireless base station device D performs handover determination from the radio wave status of the quality report (step S101) transmitted from the wireless terminal device 1. (Step S102), a control signal for handing over to the radio base station apparatus C is transmitted to the radio base station control apparatus 3 (Step S103). The control signal control unit 33 of the radio base station control device 3 that has received the control signal determines that the handover destination is a radio base station device managed by itself based on the radio base station device information 34 (step S104), a handover response (OK) permitting handover to the radio base station apparatus D is transmitted (step S105), no control signal is transmitted to the core network side, and a handover-related message is terminated by itself. The handover process to the device C is completed. The control signal control unit 33 of the radio base station control device 3 changes the data signal received from the core network side after this processing to be transmitted to the radio base station device C side. The radio communication unit 11 of the radio terminal device 1 performs a handover process from the radio base station device D to the radio base station device C in accordance with a handover instruction (step S106) transmitted from the radio base station device D (step S107).

続いて、無線端末装置１が無線基地局装置Ａに近づくと、無線基地局装置Ｃのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ１０８）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ１０９）、無線基地局装置Ａにハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ１１０）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、無線基地局装置情報３４に基づいてハンドオーバ先が自身で管理している無線基地局装置であると判断して（ステップＳ１１１）、無線基地局装置Ｃへハンドオーバを許可するハンドオーバ応答（ＯＫ）を送信し（ステップＳ１１２）、コアネットワーク側へ制御信号を一切送信せず、自身でハンドオーバに関するメッセージを終端し、無線基地局装置Ａへのハンドオーバ処理を完了させる。無線基地局制御装置３の制御信号制御部３３は、この処理の後にコアネットワーク側から受信するデータ信号は無線基地局装置Ａ側へ送信するように変更する。無線端末装置１の無線通信部１１は、無線基地局装置Ｃから送信されるハンドオーバ指示（ステップＳ１１３）に従って、無線基地局装置Ｃから無線基地局装置Ａへハンドオーバ処理を行う（ステップＳ１１４）。   Subsequently, when the wireless terminal device 1 approaches the wireless base station device A, the handover control unit 23 of the wireless base station device C performs handover from the radio wave status of the quality report (step S108) transmitted from the wireless terminal device 1. A determination is made (step S109), and a control signal for handing over to the radio base station apparatus A is transmitted to the radio base station control apparatus 3 (step S110). The control signal control unit 33 of the radio base station control device 3 that has received the control signal determines that the handover destination is a radio base station device managed by itself based on the radio base station device information 34 (step S111), a handover response (OK) permitting handover to the radio base station apparatus C is transmitted (step S112), no control signal is transmitted to the core network side, a message regarding handover is terminated by itself, and the radio base station The handover process to apparatus A is completed. The control signal control unit 33 of the radio base station control device 3 changes the data signal received from the core network side after this processing to be transmitted to the radio base station device A side. The radio communication unit 11 of the radio terminal apparatus 1 performs a handover process from the radio base station apparatus C to the radio base station apparatus A according to the handover instruction (step S113) transmitted from the radio base station apparatus C (step S114).

さらに、無線端末装置１がビルの外に出て、屋外無線基地局装置２´に近づくと、無線基地局装置Ａのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ１１５）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ１１６）、屋外無線基地局装置２´にハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ１１７）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、無線基地局装置情報３４からハンドオーバ先が自身で管理していない無線基地局装置であることから、コアネットワーク側のセンター装置へ制御信号を透過転送する（ステップＳ１１９）。無線基地局制御装置３の制御信号制御部３３は、センター装置からハンドオーバを許可するハンドオーバ応答（ＯＫ）を受信すると（ステップＳ１２０）、無線基地局装置Ａへハンドオーバ応答（ＯＫ）を送信する（ステップＳ１２１）。無線端末装置１の無線通信部１１は、無線基地局装置Ａから送信されるハンドオーバ指示（ステップＳ１２２）に従って、無線基地局装置Ａから屋外無線基地局装置２´へハンドオーバ処理を行う（ステップＳ１２３）。このように無線基地局制御装置３は、自身の管理外の無線基地局装置に対するハンドオーバと判明した場合は、当該処理にかかる制御信号をコアネットワーク側に送信することで、管理外の無線基地局装置に対するハンドオーバを実現する。   Further, when the wireless terminal device 1 goes out of the building and approaches the outdoor wireless base station device 2 ′, the handover control unit 23 of the wireless base station device A transmits a quality report transmitted from the wireless terminal device 1 (step S115). Is determined from the radio wave condition (step S116), and a control signal for handover to the outdoor radio base station apparatus 2 'is transmitted to the radio base station control apparatus 3 (step S117). The control signal control unit 33 of the radio base station control apparatus 3 that has received the control signal is a radio base station apparatus whose handover destination is not managed by itself based on the radio base station apparatus information 34, so that the center on the core network side A control signal is transparently transferred to the apparatus (step S119). When the control signal control unit 33 of the radio base station control device 3 receives a handover response (OK) permitting handover from the center device (step S120), the control signal control unit 33 transmits a handover response (OK) to the radio base station device A (step S120). S121). The radio communication unit 11 of the radio terminal apparatus 1 performs a handover process from the radio base station apparatus A to the outdoor radio base station apparatus 2 ′ according to the handover instruction (step S122) transmitted from the radio base station apparatus A (step S123). . In this way, when the radio base station control device 3 is found to be a handover to a radio base station device that is not managed by itself, the radio base station control device 3 transmits a control signal related to the processing to the core network side, so that the radio base station that is not managed Implement handover to the device.

このように実施例１によれば、無線基地局制御装置で管理する無線基地局装置間のハンドオーバであれば、センター装置に対して制御信号を送信することが不要になり、センター装置への負荷を軽減し、無線リソースの有効活用を図ることが可能となる。   As described above, according to the first embodiment, if handover is performed between radio base station devices managed by the radio base station control device, it is not necessary to transmit a control signal to the center device, and a load on the center device is reduced. It is possible to reduce radio frequency and to effectively use radio resources.

（実施例２）
次に、本実施形態に係る実施例２について説明する。無線基地局装置の配置関係は、図３と同一である。また、無線基地局制御装置３が保持する無線基地局装置情報３４は、図６に示すように、自装置が管理する８つの無線基地局装置の情報、およびそれらの無線基地局装置と屋外無線基地局装置との隣接関係を示す外部隣接関係情報を保持する。外部隣接関係情報は、無線基地局制御装置３の設置時に固定的に与えられたり、ハンドオーバの履歴を基に自動で作成するようにしてもよい。 (Example 2)
Next, Example 2 according to the present embodiment will be described. The arrangement relationship of the radio base station apparatuses is the same as that in FIG. Further, as shown in FIG. 6, the radio base station apparatus information 34 held by the radio base station control apparatus 3 includes information on eight radio base station apparatuses managed by the own apparatus, and those radio base station apparatuses and outdoor radios. External adjacency information indicating adjacency relation with the base station apparatus is held. The external adjacency information may be fixedly provided when the radio base station control device 3 is installed, or may be automatically created based on the history of handover.

図７は、実施例２に係るハンドオーバ処理を示すシーケンスである。ここで、通信中の無線端末装置１が無線基地局装置Ｄの配下に存在し、無線基地局装置Ｃ、無線基地局装置Ａを経由してビルの外に移動し、屋外無線基地局装置にハンドオーバするケースを考える。ただし、実施例１と異なり、無線基地局装置Ｃの配下にいるときに、屋外無線基地局装置へのハンドオーバ契機が発生するものとする。   FIG. 7 is a sequence illustrating the handover process according to the second embodiment. Here, the wireless terminal device 1 in communication exists under the control of the wireless base station device D, moves outside the building via the wireless base station device C and the wireless base station device A, and becomes an outdoor wireless base station device. Consider the case of handover. However, unlike Example 1, it is assumed that when the wireless base station device C is under the control, a handover opportunity to the outdoor wireless base station device occurs.

無線端末装置１が無線基地局装置Ｃに近づくと、無線基地局装置Ｄのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ２０１）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ２０２）、無線基地局装置Ｃにハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ２０３）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、無線基地局装置情報３４に基づいてハンドオーバ先が自身で管理している無線基地局装置であると判断して（ステップＳ２０４）、無線基地局装置Ｄへハンドオーバを許可するハンドオーバ応答（ＯＫ）を送信し（ステップＳ２０５）、コアネットワーク側へ制御信号を一切送信せず、自身でハンドオーバに関するメッセージを終端し、無線基地局装置Ｃとのハンドオーバ処理を完了させる。無線基地局制御装置３の制御信号制御部３３は、この処理の後にコアネットワーク側から受信するデータ信号は無線基地局装置Ｃ側へ送信するように変更する。無線端末装置１の無線通信部１１は、無線基地局装置Ｄから送信されるハンドオーバ指示（ステップＳ２０６）に従って、無線基地局装置Ｄから無線基地局装置Ｃへハンドオーバ処理を行う（ステップＳ２０７）。   When the wireless terminal device 1 approaches the wireless base station device C, the handover control unit 23 of the wireless base station device D performs a handover execution determination from the radio wave status of the quality report (step S201) transmitted from the wireless terminal device 1. (Step S202), a control signal for handover to the radio base station apparatus C is transmitted to the radio base station control apparatus 3 (Step S203). The control signal control unit 33 of the radio base station control device 3 that has received the control signal determines that the handover destination is a radio base station device managed by itself based on the radio base station device information 34 (step S204), a handover response (OK) permitting handover to the radio base station apparatus D is transmitted (step S205), no control signal is transmitted to the core network side, and a handover-related message is terminated by itself. The handover process with the device C is completed. The control signal control unit 33 of the radio base station control device 3 changes the data signal received from the core network side after this processing to be transmitted to the radio base station device C side. The radio communication unit 11 of the radio terminal apparatus 1 performs a handover process from the radio base station apparatus D to the radio base station apparatus C according to the handover instruction (step S206) transmitted from the radio base station apparatus D (step S207).

続いて、無線基地局装置Ｃのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ２０８）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ２０９）、無線基地局装置Ｃは屋外無線基地局装置２´にハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ２１０）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、無線基地局装置情報３４に基づいてハンドオーバ先が自身で管理していない無線基地局装置であること（ステップＳ２１１）、および無線基地局装置情報３４の外部隣接関係により無線基地局装置Ｃが外部と隣接関係にないこと（ステップＳ２１２）を判断し、ハンドオーバを拒否するハンドオーバ応答（ＮＧ）を無線基地局装置Ｃへ送信する（ステップＳ２１３）。その結果、無線端末装置１は無線基地局装置Ｃとの接続を継続する（ステップＳ２１４）。   Subsequently, the handover control unit 23 of the radio base station apparatus C performs a handover execution determination from the radio wave status of the quality report (step S208) transmitted from the radio terminal apparatus 1 (step S209), and the radio base station apparatus C A control signal for handing over to the outdoor radio base station apparatus 2 ′ is transmitted to the radio base station control apparatus 3 (step S210). The control signal control unit 33 of the radio base station control device 3 that has received the control signal is a radio base station device whose handover destination is not managed by itself based on the radio base station device information 34 (step S211). Then, it is determined that the radio base station apparatus C is not adjacent to the outside (step S212) based on the external adjacency relationship of the radio base station apparatus information 34, and a handover response (NG) for rejecting the handover is transmitted to the radio base station apparatus C. (Step S213). As a result, the wireless terminal device 1 continues the connection with the wireless base station device C (step S214).

その後、無線端末装置１が無線基地局装置Ａに近づくと、無線基地局装置Ｃのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ２１５）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ２１６）、無線基地局装置Ａにハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ２１７）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、無線基地局装置情報３４に基づいてハンドオーバ先が自身で管理している無線基地局装置であると判断して（ステップＳ２１８）、無線基地局装置Ｃへハンドオーバを許可するハンドオーバ応答（ＯＫ）を送信し（ステップＳ２１９）、コアネットワーク側へ制御信号を一切送信せず、自身でハンドオーバに関するメッセージを終端し、無線基地局装置Ａへのハンドオーバ処理を完了させる。無線基地局制御装置３の制御信号制御部３３は、この処理の後にコアネットワーク側から受信するデータ信号は無線基地局装置Ａ側へ送信するように変更する。無線端末装置１の無線通信部１１は、無線基地局装置Ｃから送信されるハンドオーバ指示（ステップＳ２２０）に従って、無線基地局装置Ｃから無線基地局装置Ａへハンドオーバ処理を行う（ステップＳ２２１）。   Thereafter, when the wireless terminal device 1 approaches the wireless base station device A, the handover control unit 23 of the wireless base station device C determines whether or not to perform handover based on the radio wave status of the quality report (step S215) transmitted from the wireless terminal device 1. (Step S216), and a control signal for handing over to the radio base station apparatus A is transmitted to the radio base station control apparatus 3 (step S217). The control signal control unit 33 of the radio base station control device 3 that has received the control signal determines that the handover destination is a radio base station device managed by itself based on the radio base station device information 34 (step S218), a handover response (OK) for permitting handover to the radio base station apparatus C is transmitted (step S219), no control signal is transmitted to the core network side, and a message relating to handover is terminated by itself. The handover process to apparatus A is completed. The control signal control unit 33 of the radio base station control device 3 changes the data signal received from the core network side after this processing to be transmitted to the radio base station device A side. The radio communication unit 11 of the radio terminal device 1 performs a handover process from the radio base station device C to the radio base station device A in accordance with a handover instruction (step S220) transmitted from the radio base station device C (step S221).

さらに、無線端末装置１がビルの外に出て、屋外無線基地局装置２´に近づくと、無線基地局装置Ａのハンドオーバ制御部２３は無線端末装置１から送信される品質レポート（ステップＳ２２２）の電波状況から、ハンドオーバの実施判定を行い（ステップＳ２２３）、屋外無線基地局装置２´にハンドオーバするための制御信号を無線基地局制御装置３へ送信する（ステップＳ２２４）。当該制御信号を受信した無線基地局制御装置３の制御信号制御部３３は、ハンドオーバ先が自身で管理していない無線基地局装置であること（ステップＳ２２５）、および無線基地局装置情報３４の外部隣接関係で無線基地局装置Ａが外部と隣接関係にあること（ステップＳ２２６）を判断し、コアネットワーク側へ制御信号を透過転送する（ステップＳ２２７）。無線基地局制御装置３の制御信号制御部３３は、センター装置からハンドオーバを許可するハンドオーバ応答（ＯＫ）を受信すると（ステップＳ２２８）、無線基地局装置Ａへハンドオーバ応答（ＯＫ）を送信する（ステップＳ２２９）。無線端末装置１の無線通信部１１は、無線基地局装置Ａから送信されるハンドオーバ指示（ステップＳ２３０）に従って、無線基地局装置Ａから屋外無線基地局装置２´へハンドオーバ処理を行う（ステップＳ２３１）。このように無線基地局制御装置３は自身の管理外の無線基地局装置に対するハンドオーバと判明した場合は、当該処理にかかる制御信号をコアネットワーク側に送信することで、管理外の無線基地局装置に対するハンドオーバを実現する。   Further, when the wireless terminal device 1 goes out of the building and approaches the outdoor wireless base station device 2 ′, the handover control unit 23 of the wireless base station device A transmits a quality report transmitted from the wireless terminal device 1 (step S222). Is determined from the radio wave condition (step S223), and a control signal for handover to the outdoor radio base station apparatus 2 ′ is transmitted to the radio base station control apparatus 3 (step S224). The control signal control unit 33 of the radio base station control device 3 that has received the control signal indicates that the handover destination is a radio base station device that is not managed by itself (step S225) and that the radio base station device information 34 It is determined that the radio base station apparatus A is adjacent to the outside in the adjacent relationship (step S226), and the control signal is transparently transferred to the core network side (step S227). When the control signal control unit 33 of the radio base station control device 3 receives a handover response (OK) permitting handover from the center device (step S228), the control signal control unit 33 transmits a handover response (OK) to the radio base station device A (step S228). S229). The radio communication unit 11 of the radio terminal device 1 performs a handover process from the radio base station device A to the outdoor radio base station device 2 ′ in accordance with the handover instruction (step S230) transmitted from the radio base station device A (step S231). . In this way, when the radio base station control device 3 is found to be a handover to a radio base station device that is not managed by itself, the radio base station control device 3 transmits a control signal related to the processing to the core network side, so that the radio base station device that is not managed A handover for is realized.

このように実施例２によれば、本来ビル内に設定された無線基地局装置と通信できれば品質が保証できるような無線端末に対して、屋外無線基地局装置とのハンドオーバをなくし、さらに不要な制御信号の削減、および無線リソースの有効活用を図ることができるようになる。   As described above, according to the second embodiment, handover with an outdoor radio base station apparatus is eliminated for a radio terminal whose quality can be guaranteed if it can communicate with a radio base station apparatus originally set in a building. Control signals can be reduced and radio resources can be effectively used.

以上述べたように、本実施形態では、無線基地局装置とセンター装置との間に無線基地局制御装置を設け、ハンドオーバ処理にかかる制御信号の一部をセンター装置へ送信しないようにすることで、センター装置の負荷を低減する。さらに、不要なハンドオーバを抑制することで、センター装置に対して更なる負荷低減を実現する。これにより、統括局以外の無線基地局装置に対するハンドオーバの制御信号の送信も抑止することができるようになる。   As described above, in this embodiment, a radio base station control device is provided between the radio base station device and the center device so that a part of the control signal for the handover process is not transmitted to the center device. , Reduce the load on the center device. Further, by suppressing unnecessary handover, further reduction of the load on the center apparatus is realized. Accordingly, transmission of a handover control signal to a radio base station apparatus other than the central station can be suppressed.

したがって、本実施形態によれば、ビル、地下鉄など、出入口が決まっている構造をもった建物に対し、コアネットワーク側へ送信される制御信号を効果的に削減することが可能となる。   Therefore, according to the present embodiment, it is possible to effectively reduce control signals transmitted to the core network side for buildings such as buildings and subways that have a structure with a fixed entrance.

なお、いくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   Although several embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１…無線端末装置、１１…無線通信部、１２…品質測定部、１３…品質レポート部、２…無線基地局装置、２１…無線通信部、２２…品質レポート受信部、２２…ハンドオーバ制御部、２４…有線通信部、３…無線基地局制御装置、３１…基地局通信部、３２…センター通信部、３３…制御信号制御部、３４…無線基地局装置情報、ＮＷ…コアネットワーク。   DESCRIPTION OF SYMBOLS 1 ... Wireless terminal device, 11 ... Wireless communication part, 12 ... Quality measurement part, 13 ... Quality report part, 2 ... Wireless base station apparatus, 21 ... Wireless communication part, 22 ... Quality report receiving part, 22 ... Handover control part, 24 ... Wired communication unit, 3 ... Radio base station control device, 31 ... Base station communication unit, 32 ... Center communication unit, 33 ... Control signal control unit, 34 ... Radio base station device information, NW ... Core network.

Claims (6)

無線端末装置と無線通信を行う複数の第１の無線基地局装置と、前記複数の第１の無線基地局装置を管理し、コアネットワークを介して管理外の第２の無線基地局装置と接続可能な無線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、
前記無線基地局制御装置は、
前記複数の第１の無線基地局装置を識別する無線基地局装置情報を記憶する記憶手段と、
前記第１の無線基地局装置が送信したハンドオーバの要求信号を受信した場合に、前記無線基地局装置情報に基づいて、ハンドオーバ先が他の前記第１の無線基地局装置である場合は前記要求信号を送信した前記第１の無線基地局装置へハンドオーバを許可する応答信号を送信し、ハンドオーバ先が前記第２の無線基地局装置である場合は前記要求信号を前記コアネットワークに転送する制御信号制御手段と
を備えることを特徴とする無線通信システム。 A plurality of first radio base station devices that perform radio communication with a radio terminal device, and a plurality of first radio base station devices that are managed and connected to an unmanaged second radio base station device via a core network A wireless communication system comprising a possible wireless base station control device,
The radio base station controller is
Storage means for storing radio base station apparatus information for identifying the plurality of first radio base station apparatuses;
When the handover request signal transmitted by the first radio base station apparatus is received, based on the radio base station apparatus information, if the handover destination is another first radio base station apparatus, the request A control signal that transmits a response signal permitting handover to the first radio base station apparatus that has transmitted the signal, and transfers the request signal to the core network when the handover destination is the second radio base station apparatus A wireless communication system comprising a control means. 前記記憶手段は、前記複数の第１の無線基地局装置と前記第２の無線基地局装置との隣接関係を示す外部隣接関係情報をさらに記憶し、
前記制御信号制御手段は、前記ハンドオーバ先が前記第２の無線基地局装置である場合は、前記外部隣接関係情報に基づいて、前記要求信号を送信した第１の無線基地局装置が前記第２の無線基地局装置と隣接しない場合は当該第１の無線基地局装置へハンドオーバを拒否する応答信号を送信することを特徴とする請求項１に記載の無線通信システム。 The storage means further stores external adjacency information indicating an adjacency relationship between the plurality of first radio base station devices and the second radio base station device,
When the handover destination is the second radio base station apparatus, the control signal control means is configured such that the first radio base station apparatus that has transmitted the request signal based on the external adjacency information is the second radio base station apparatus. 2. The wireless communication system according to claim 1, wherein when the wireless base station apparatus is not adjacent to the wireless base station apparatus, a response signal rejecting the handover is transmitted to the first wireless base station apparatus. 無線端末装置と無線通信を行う複数の第１の無線基地局装置を管理し、コアネットワークを介して管理外の第２の無線基地局装置と接続可能な無線基地局制御装置であって、
前記複数の第１の無線基地局装置を識別する無線基地局装置情報を記憶する記憶手段と、
前記第１の無線基地局装置が送信したハンドオーバの要求信号を受信した場合に、前記無線基地局装置情報に基づいて、ハンドオーバ先が他の前記第１の無線基地局装置である場合は前記要求信号を送信した前記第１の無線基地局装置へハンドオーバを許可する応答信号を送信し、ハンドオーバ先が前記第２の無線基地局装置である場合は前記要求信号を前記コアネットワークに転送する制御信号制御手段と
を備えることを特徴とする無線基地局制御装置。 A radio base station control apparatus that manages a plurality of first radio base station apparatuses that perform radio communication with a radio terminal apparatus and is connectable to a second radio base station apparatus that is not managed via a core network,
Storage means for storing radio base station apparatus information for identifying the plurality of first radio base station apparatuses;
When the handover request signal transmitted by the first radio base station apparatus is received, based on the radio base station apparatus information, if the handover destination is another first radio base station apparatus, the request A control signal that transmits a response signal permitting handover to the first radio base station apparatus that has transmitted the signal, and transfers the request signal to the core network when the handover destination is the second radio base station apparatus A radio base station control apparatus comprising: a control unit; 前記記憶手段は、前記複数の第１の無線基地局装置と前記第２の無線基地局装置との隣接関係を示す外部隣接関係情報をさらに記憶し、
前記制御信号制御手段は、前記ハンドオーバ先が前記第２の無線基地局装置である場合は、前記外部隣接関係情報に基づいて、前記要求信号を送信した第１の無線基地局装置が前記第２の無線基地局装置と隣接しない場合は当該第１の無線基地局装置へハンドオーバを拒否する応答信号を送信することを特徴とする請求項３に記載の無線基地局制御装置。 The storage means further stores external adjacency information indicating an adjacency relationship between the plurality of first radio base station devices and the second radio base station device,
When the handover destination is the second radio base station apparatus, the control signal control means is configured such that the first radio base station apparatus that has transmitted the request signal based on the external adjacency information is the second radio base station apparatus. 4. The radio base station control device according to claim 3, wherein a response signal for rejecting handover is transmitted to the first radio base station device when the radio base station device is not adjacent to the first radio base station device. 無線端末装置と無線通信を行う複数の第１の無線基地局装置と、前記複数の第１の無線基地局装置を管理し、コアネットワークを介して管理外の第２の無線基地局装置と接続可能な無線基地局制御装置とを備える無線通信システムに用いられる方法であって、
前記無線基地局制御装置は、
前記複数の第１の無線基地局装置を識別する無線基地局装置情報を記憶する記憶ステップと、
前記第１の無線基地局装置が送信したハンドオーバの要求信号を受信した場合に、前記無線基地局装置情報に基づいて、ハンドオーバ先が他の前記第１の無線基地局装置である場合は前記要求信号を送信した前記第１の無線基地局装置へハンドオーバを許可する応答信号を送信し、ハンドオーバ先が前記第２の無線基地局装置である場合は前記要求信号を前記コアネットワークに転送する制御信号制御ステップと
を有することを特徴とする無線通信方法。 A plurality of first radio base station devices that perform radio communication with a radio terminal device, and a plurality of first radio base station devices that are managed and connected to an unmanaged second radio base station device via a core network A method used in a radio communication system comprising a possible radio base station controller,
The radio base station controller is
A storage step of storing radio base station apparatus information for identifying the plurality of first radio base station apparatuses;
When the handover request signal transmitted by the first radio base station apparatus is received, based on the radio base station apparatus information, if the handover destination is another first radio base station apparatus, the request A control signal that transmits a response signal permitting handover to the first radio base station apparatus that has transmitted the signal, and transfers the request signal to the core network when the handover destination is the second radio base station apparatus And a control step. 前記記憶ステップにおいて、前記無線基地局制御装置は、前記複数の第１の無線基地局装置と前記第２の無線基地局装置との隣接関係を示す外部隣接関係情報をさらに記憶し、
前記制御信号制御ステップにおいて、前記無線基地局制御装置は、前記ハンドオーバ先が前記第２の無線基地局装置である場合は、前記外部隣接関係情報に基づいて、前記要求信号を送信した第１の無線基地局装置が前記第２の無線基地局装置と隣接しない場合は当該第１の無線基地局装置へハンドオーバを拒否する応答信号を送信することを特徴とする請求項５に記載の無線通信方法。 In the storing step, the radio base station control device further stores external adjacency information indicating an adjacency relationship between the plurality of first radio base station devices and the second radio base station device,
In the control signal control step, when the handover destination is the second radio base station device, the radio base station control device transmits the request signal based on the external adjacency information. 6. The radio communication method according to claim 5, wherein when the radio base station apparatus is not adjacent to the second radio base station apparatus, a response signal for rejecting handover is transmitted to the first radio base station apparatus. .
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