JP2003199166A - Digital mobile communication system - Google Patents

Digital mobile communication system

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JP2003199166A
JP2003199166A JP2001399180A JP2001399180A JP2003199166A JP 2003199166 A JP2003199166 A JP 2003199166A JP 2001399180 A JP2001399180 A JP 2001399180A JP 2001399180 A JP2001399180 A JP 2001399180A JP 2003199166 A JP2003199166 A JP 2003199166A
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station
base station
frequency
terminal
wireless
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Tomokazu Arise
友和 有瀬
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Hitachi Kokusai Electric Inc
株式会社日立国際電気
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Abstract

PROBLEM TO BE SOLVED: To provide a digital mobile communication system that solves problems of a conventional system having needed manual revision setting of a frequency into inter-terminal-station direct communication frequency in the case of making communication from a wireless terminal station in a service area of a wireless base station to a terminal station at the outside of an area not through the base station and having needed setting revision operations to obtain a frequency from the base station and the inter-terminal-station direct communication frequency on each occasion when the terminal station moves from the base station service area to the outside of the area of vice versa.
SOLUTION: The terminal station monitors a reception level of a signal sent from the base station and measures a reception level of a signal from peripheral base stations when the reception level of the signal from the base station is a prescribed level or below. The terminal station automatically selects the reception frequency into the inter-terminal-station direct communication frequency when the terminal station cannot find out the reception level of the signal being a specified level or more. Further, a timing of switching between a frequency of a signal sent from the base station for the terminal station within the base station service area and an inter-terminal-station direct communication frequency from the terminal station at the outside of the area is synchronized by receiving time reference information from a GPS receiver or a standard radio wave receiver and generating a clock signal.
COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、デジタル移動通信システムに関するものである。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to a digital mobile communications system. 【0002】 【従来の技術】従来、実用化されている移動通信システムの例として、図1に示すような無線通信回線の制御を行う制御装置101と、該制御装置の制御のもとに無線端末局間の無線通信の中継とサービスエリアの維持を行う1つあるいは複数の無線基地局102〜104と、該無線基地局を介して無線通信を行う複数の無線端末局1 [0004] Conventionally, as an example of a mobile communication system has been put to practical use, a control unit 101 for controlling the wireless communication line as shown in FIG. 1, the radio under the control of the control device and one or more radio base stations 102 to 104 to perform the maintenance of the relay and the service area of ​​the wireless communication between the terminal stations, a plurality of wireless terminal stations 1 to perform wireless communication through wireless base station
05〜110とから構成される移動通信システムが知られている。 Mobile communication systems are known composed of Metropolitan 05-110. 該移動通信システムでは、無線端末局105 In the mobile communication system, the wireless terminal station 105
が他の無線端末局109と無線通信を行う場合、前記無線端末局105は、無線基地局103が無線通信可能範囲を維持するサービスエリア2内において、前記無線基地局103を介し、制御装置101により制御される無線通信回線を使用して他のサービスエリア3内の無線端末局109と無線通信を行っている。 If is performing wireless communication with another wireless terminal station 109, the wireless terminal station 105 in the service area 2 of the radio base station 103 to maintain a wireless communication range, via the radio base station 103, the controller 101 using radio communication channel that is controlled is performed wireless terminal station 109 and the radio communication of another service area 3 by. 一方、このような移動通信システムで使用されている無線端末局105〜 On the other hand, the wireless terminal station used in the mobile communication system 105 to
110には、無線基地局102〜104の各サービスエリア1〜3外において、前記無線基地局を介さずに、各サービスエリア外に位置する無線端末局107が同様に各サービスエリア外に位置する無線端末局108と相互に通信を行うことを目的とした無線端末局間の直接通信機能が設けられている。 The 110 in each service area 1-3 out of the radio base station 102 to 104, without through the wireless base station, the wireless terminal station 107 is located outside the service area similarly located outside the service area direct communication function between the wireless terminal stations for the purpose of performing mutual communication and the wireless terminal station 108 is provided. 該機能を用いることにより、無線基地局102〜104のサービスエリア1〜3外に位置する無線端末局107は、同じくサービスエリア外に位置する無線端末局108又は、サービスエリア2内に位置する無線端末局106と相互に通信を行うことが可能である。 By using the function, the wireless terminal station 107 located in the service area 1-3 outside of the radio base station 102 to 104, the wireless terminal station 108 also located outside the service area or radio located within the service area 2 it is possible to perform mutual communication with the terminal station 106. 【0003】 【発明が解決しようとする課題】前述した従来の移動通信システムには、次のような欠点がある。 [0003] The present invention is to provide a in the conventional mobile communication system described above has the following disadvantages. (1)無線基地局103のサービスエリア2内において、無線基地局103を介さずに、無線端末局106が前記サービスエリア2外の無線端末局107と相互に直接無線通信を行うためには、前記無線端末局106及び無線端末局10 (1) In the service area 2 of the radio base station 103, without through the wireless base station 103, for the wireless terminal station 106 is to perform direct wireless communication with each other and the service area 2 outside the wireless terminal station 107, the wireless terminal station 106 and the wireless terminal station 10
7の周波数を移動局間直接通信用に割当てられた専用の周波数に夫々切替える必要がある。 It is necessary to respectively switch to a dedicated frequency assigned seven frequencies for communication between mobile station directly. しかし、この周波数の切替え動作により前記無線端末局106は前記無線基地局103の制御情報を受信できなくなってしまうため、移動通信システムから切り離されてしまうことになる。 However, the wireless terminal station 106 by switching operation of the frequency will be the order no longer able to receive control information on the radio base station 103, thereby disconnected from the mobile communication system. よって、無線基地局103のサービスエリア2内にあり、かつ移動局間直接通信用の周波数に設定された前記無線端末局106は他のサービスエリア3内無線端末局109と無線基地局103、制御装置101、無線基地局104を介して無線通信を行おうとしても、通信を行うことが出来なくなってしまうという欠点がある。 Therefore, there is a service area 2 of the radio base station 103, and is set to a frequency for communication between the mobile station directly the wireless terminal station 106 in another service area 3 wireless terminal station 109 and the radio base station 103, control device 101, even attempts to radio communication via the radio base station 104, it has the disadvantage that it becomes impossible to perform communication.
(2)上記課題を解決する手段として、無線基地局10 (2) As a means to solve the above problems, a radio base station 10
3が送信する周波数と移動局間直接通信用の周波数を前記無線端末局106が夫々受信できるようにすればよいが、これを実現するには、2つの受信部が必要となり、 3 may be such that the frequency of the communication between the mobile station directly with the frequency of the transmitting wireless terminal station 106 can respectively receive, but to realize this, requires two receiving portions,
機器の小型化及び低価格化に不利となる欠点がある。 There is a disadvantage to be a disadvantage to the miniaturization and cost reduction of the equipment.
(3)無線基地局のサービスエリア外の無線端末局同士、あるいはサービスエリア内に位置する無線端末局とサービスエリア外の無線端末局が相互に直接無線通信を行うためには、あらかじめ運用手順を決めておき、相互が移動局直接通信用の周波数に設定変更操作をしない限り相互の通信が成立しないという欠点がある。 (3) The radio terminal station between the outside of the service area of ​​the radio base station, or to the wireless terminal station and outside the service area of ​​the wireless terminal stations perform direct wireless communication with each other, located in the service area, the pre-operational procedures I decided advance, there is a drawback that mutually communicate with each other unless the setting change operation on the frequency of the communication mobile station directly is not established. すなわち、無線基地局103のサービスエリア2外に位置する無線端末局107が、前記サービスエリア2内に位置する無線端末局に106に対し、メッセージの中継を依頼しようとしても、相手側の無線端末局106が移動局直接通信用の周波数に設定変更操作をしない限り通信が成立しないことになる。 That is, the wireless terminal station 107 located in the service area 2 outside of the radio base station 103, to 106 to the wireless terminal station located in the service area 2, even if an attempt is requested to relay the message, the counterpart of the radio terminal station 106 is a communication unless the setting change operation on the frequency of the communication mobile station directly is not satisfied. (4)前記移動通信システムにおいて、無線基地局のサービスエリア内に位置する無線端末局が、前記サービスエリア内外の無線端末局と相互に直接無線通信を行うためには、移動局間直接通信用の周波数へ手動で切替える操作が必要である。 (4) In the mobile communication system, a wireless terminal station located within the service area of ​​the radio base station to be able to perform direct wireless communication with each other and the wireless terminal station of the service area and out, for communication between the mobile station directly manually switching operation to the frequency is required. したがって、 Therefore,
無線端末局が無線基地局のサービスエリア内から、該サービスエリア外に移動した場合、無線端末局側にて無線基地局のサービスエリアを外れたことを認識し、移動局間直接通信用の周波数への設定変更操作を行わない限り、移動局間直接通信及び無線基地局のサービスエリア内に位置する無線端末局からの無線基地局を介した無線通信の双方が成立しなくなってしまうという欠点がある。 From the wireless terminal station within the service area of ​​the radio base station, when moving out of the service area, recognizes that out of the coverage of the radio base station by the wireless terminal station side, the frequency of the communication between the mobile station directly unless change the setting operation to, the disadvantage that both the radio communication through the radio base station from the wireless terminal station located within the service area of ​​the mobile station direct communication between and the radio base station is no longer met is there. 本発明は、前記各々の欠点を除去するために、全地球航空測位システム(Global Positioning Systemで以下、GPSと略す)の衛星からの受信信号から算出された時刻データを用いることにより、無線基地局が送信する周波数と移動局間直接通信用の周波数を受信する受信部の両方を用意することなく、夫々の場合の無線通信を実現することを第1の目的とする。 The present invention, in order to eliminate the disadvantages of the respective, (hereinafter in Global Positioning System, referred to as GPS) Global aviation positioning system by using a time data calculated from the received signal from the satellite, the radio base station There without preparing both receiver for receiving frequency for communication between a mobile station directly with the frequency to be transmitted, a first object to realize a wireless communication in each case. さらに、本発明の第2の目的は、無線端末局が無線基地局のサービスエリア内からサービスエリア外に移動した際に、無線端末局の周波数を移動局間直接通信用に割当てられた専用の周波数に自動的に切替える事により、手動切替え操作忘れの場合に、移動局間直接通信用の周波数に設定された無線端末局からの呼出しが受信できないという状態を解決することにある。 Further, a second object of the present invention, when the wireless terminal station moves from the service area of ​​the radio base station out of the service area, the dedicated allocated the frequency of the radio terminal station for communication between the mobile station directly by switching automatically to the frequency, in the case of manual switching operation forgotten, calls from being set to a frequency for communication between mobile station direct wireless terminal station is to solve the state can not receive. 【0004】 【課題を解決するための手段】本発明は、前記第1の目的を達成するために、無線端末局において無線基地局から送信される信号の受信レベルの監視を行い、自局の受信レベルが所定の規定値以下に落ち込んだ場合、周辺の無線基地局からの信号の受信レベルを測定するモードを起動する。 [0004] According to an aspect of the present invention, in order to achieve the first object, it monitors the reception level of the signal transmitted from the radio base station in the wireless terminal station, the local station If the reception level fell below a predetermined specified value, it activates a mode for measuring the reception level of the signal from the surrounding radio base stations. この時、受信レベルが所定規定値以上の無線基地局が見つからない場合、自動的に受信周波数を無線端末局間直接通信の周波数に変更する手段を備える。 In this case, if the reception level is not found predetermined specified value or more radio base stations comprises means for automatically changing the reception frequency to the frequency of direct communication between wireless terminal stations. 更に、本発明は、前記第1と第2の目的を達成するため、 Furthermore, since the present invention is to achieve the first and second objects,
GPS衛星からの測距電波を受信し、時刻情報を抽出するGPS受信機、または、時刻に関する情報としてタイムコードを送信する標準電波受信機の時刻情報を元に定められた所定のタイミングにより、無線基地局送信周波数と移動局間直接通信用周波数を交互に受信する手段を備えることにより、無線基地局のサービスエリア内において無線基地局を介した無線通信による呼出しと、移動局間直接通信による呼出しに対して同時に待ち受けを可能とする。 Receiving a ranging signals from GPS satellites, GPS receiver extracts the time information, or a predetermined timing determined based on the time information of the standard radio receiver for transmitting a time code as information about the time, the radio by providing a means for receiving the base station transmit frequency and the inter-mobile station direct communication frequency alternating a call by wireless communication via a wireless base station within the service area of ​​the radio base station, a call by the inter-mobile station direct communication to enable the standby at the same time against. 【0005】 【発明の実施の形態】本発明によるデジタル移動通信システムの実施の形態を説明する前に、本発明に係る基本的事項を説明する。 [0005] Before describing the embodiment of a digital mobile communication system according to an embodiment of the present invention, illustrating the basic matters of the present invention. 一般的なデジタル移動通信システムにおける一実施例の接続制御フローを図2により説明する。 The connection control flow of one embodiment of a general digital mobile communication system will be described with reference to FIG. 無線端末局は待ち受け及び位置登録の制御を行っている。 Wireless terminal is performing a control of the standby and location registration. まず、無線端末局は無線基地局が送信する制御チャネルをスキャンし、もっとも受信レベルの高い制御チャネルを受信する事により呼接続に必要な制御情報を得る。 First, the wireless terminal station scans the control channel by the radio base station transmits, to obtain control information necessary for call connection by receiving the highest receiving level control channel. 該制御情報に含まれる基地局情報が無線端末局内部に記憶されている基地局情報と異なっている場合、自分の移動機番号を無線基地局の基地局無線機を介して制御装置に送出することにより位置情報を登録する。 If the base station information included in the control information is different from the base station information stored in the internal wireless terminal station transmits his mobile number to the control device via the base station radios of a radio base station to register the location information by. それに引き続き、無線端末局では、着信時における無線端末局の呼出しなどに利用する制御情報を報知する呼出し用のチャネルを受信し、着信の待ち受けを行う。 Following that, the wireless terminal station receives a channel for a call for notifying control information to be used for such calls to the wireless terminal station at the time of incoming call, performs waiting for incoming call. また、無線端末局は無線基地局の制御チャネルにて指定される所定のチャネル切替えレベルに対して、無線基地局からの受信信号が所定時間継続して低下した場合は、周辺ゾーン監視モードを起動し、周辺の無線基地局が送信する制御チャネルを受信する。 Further, the wireless terminal station for a given channel switching level specified by the control channel of the radio base station, the received signal from the radio base station if the decreased continuously for a predetermined time, the peripheral zone monitoring mode activation and, around the radio base station receives a control channel for transmitting. この時、既に位置情報の登録を行った無線基地局よりも受信レベルの高い無線基地局があった場合、新たに位置情報の登録を行うことによって、 At this time, if there is already high base station reception level than the radio base station performing the registration of location information, by performing the registration of new location information,
より受信レベルの高い無線基地局のサービスエリアにて着信の待ち受けを行う。 Performing listening for incoming at a more service areas of higher reception level radio base station. 一方、周辺ゾーン監視モードにて規定レベル以上の基地局が見つからない場合には圏外表示を行うと同時に監視モードを継続する仕組みになっている。 On the other hand, it has a mechanism to continue the monitoring mode and at the same time carry out the out-of-service display in the case where in the peripheral zone monitoring mode can not find the specified level or more base stations. したがって、このとき、デジタル移動通信システムにおける無線基地局のサービスエリアを外れた無線端末局は無線基地局を介した通信及び、無線基地局を介さない無線端末局間直接通信の双方からの呼出しに対して応答できない状態になる。 Therefore, at this time, the wireless terminal station which is out of the coverage of the radio base station in a digital mobile communication systems communications and via a wireless base station, the calls from both between wireless terminal stations direct communication without through the wireless base station a state can not respond for. 無線基地局を介した無線通信機能と、無線基地局を介さない無線端末局間直接通信機能を択一的に選択して使用するデジタル移動通信システムにおける一実施例の接続制御フローを図3に示す。 And a wireless communication function through the wireless base station, the connection control flow of an embodiment of a digital mobile communication system using alternatively selects and between wireless terminal stations direct communication function without through the wireless base station in FIG. 3 show.
周辺ゾーン監視モードにおいて周辺に基準レベル以上の無線基地局が存在しない場合には、受信周波数を無線端末局間直接通信用周波数に切替える手順を含むことにより、無線基地局サービスエリア外においては無線端末局間直接通信用周波数における呼に対して応答できるようになる。 If there is no reference level or more radio base stations around the peripheral zone monitoring mode, by including the steps of switching the reception frequency to the direct communication frequency between wireless terminal stations, the wireless terminal in the radio base station out of service area It will be able to respond to the call in interoffice direct communication frequency. また、無線基地局サービスエリア外においては、再度、無線基地局のサービスエリア内に入ったことを検知するために、周辺ゾーン監視モードを継続し、周辺無線基地局からの受信状態を監視する必要があるが、 In the outside the wireless base station service area, again, in order to detect that it has entered the service area of ​​the radio base station, to continue the peripheral zone monitoring mode, necessary to monitor the reception status from the neighboring radio base station Although there are,
無線基地局の状態を監視するためには周期的に周波数を無線基地局の周波数に切替える必要がある。 To monitor the status of the radio base station needs to switch periodically frequency to the frequency of the radio base station. ところが、 However,
該切替え動作後に無線端末局間直接通信モードとなっている他の無線端末局からの呼が生じた場合、呼損となり通信が成立しないという問題がある。 If after 該切 replacement operation call from another wireless terminal station has a direct communication mode between the wireless terminal station occurs, there is a problem that the communication becomes call loss is not established. そこで、本発明は無線基地局サービスエリア内外に位置する双方の無線端末局において、GPS受信機又は標準電波受信機からの高精度な時間情報を元に共通のタイミングで切替え動作させる事によって、無線基地局のサービスエリア内外に位置する双方の無線端末局で、無線端末局間直接通信用周波数を受信するタイミングの同期がとれるようになる。 Accordingly, the present invention provides both the wireless terminal stations located inside and outside the radio base station service area, by which switching is operated at a common timing based on highly accurate time information from the GPS receiver or the standard radio receiver, radio both terminal stations located in the service area and out of the base station, so that locking can be established in the timing of receiving the direct communication frequency between wireless terminal stations. デジタル信号を伝送するデジタル移動通信システムでは、情報を正しく伝送する為に送信側のクロックと受信側のクロックのタイミングを正確に合わせる必要がある。 In digital mobile communications systems for transmitting digital signals, since it is necessary to accurately adjust the timing of the clock of the receiving side and the transmission side clock for transmitting information correctly. 従来の移動通信システムの場合、一般に基地局側に高精度の発信器が備えられ、また無線端末局側は、無線基地局が送信する信号受けてクロック信号を生成することにより、無線基地局と無線端末局が同じタイミングで動作することが可能となっている。 For the conventional mobile communication system, generally high accuracy oscillator in is provided on the base station side, the wireless terminal station side, by the wireless base station generates a clock signal by receiving the signal to be transmitted, the radio base station the wireless terminal station has become possible to operate at the same timing. しかし、無線基地局のサービスエリア外に位置する無線端末局は、無線基地局の送信する信号を受信する事が出来ない為、クロック信号を生成することができず、無線基地局のタイミングとは異なった独自のタイミングで動作していた。 However, the wireless terminal station located outside the service area of ​​the radio base station, it is not possible to receive a transmission signal of the radio base station can not generate a clock signal, the timing of the radio base station It was operating in different own timing. 本発明におけるシステムクロック同期手段の一構成例のブロック図を図4に示す。 A block diagram of an exemplary configuration of a system clock synchronizing means of the present invention shown in FIG. 無線基地局及び無線端末局内の各無線装置のクロック生成部を同じとし、GPS受信機又は標準電波受信機201から出力される時刻基準信号を前記無線装置202の同期維持回路203に入力しクロックを生成することにより、システム全体が同一の周波数精度とタイミングを得る事が出来、このクロックを利用して動作させることにより、全ての無線装置202が同じタイミングのクロックで動作し、システム全体の同期がとれることになる。 The radio base station and the same as those of the clock generation unit of each wireless device of the wireless terminal station, an input clock a time reference signal outputted from the GPS receiver or the standard radio wave receiver 201 to maintain synchronization circuit 203 of the wireless device 202 by produced, can be the entire system to obtain the same frequency accuracy and timing, by operating by using this clock, all of the wireless device 202 is clocked at the same time, the system-wide synchronization It will be taken. 次に、上記クロックを元に無線端末局間直接通信チャネルの切替えを行う方法についてF Then, F how to perform switching of direct communication channel between the wireless terminal station based on the clock
DMA(Frequency Division Multiple Access)方式によるデジタル移動通信システムを例に説明する。 The digital mobile communication system according to DMA (Frequency Division Multiple Access) scheme as an example. 無線端末局と無線基地局間の無線チャネルは用途別に、呼接続に必要な制御情報の転送を行う制御用チャネルと、ユーザ情報の転送を行うトラフィック用チャネルに大別され、それら無線チャネルの一例は図5に示すように40ms The radio channel by application between the wireless terminal station and the radio base station, a control channel for transferring control information necessary for call connection, is divided into traffic channels for transferring user information, an example of which radio channel 40ms as is shown in FIG. 5
のフレーム長を単位に構成される。 Composed of frame length of the unit. また、1フレーム長の18倍の長さを単位にスーパーフレームを規定する。 Moreover, defining a superframe of 18 times the length of one frame length in the unit. これら無線チャネルは、さらに機能チャネルで構成され、 These radio channels are configured with further function channel,
制御チャネルの場合報知チャネル(BCCH)、信号制御チャネル(SCCH)、呼出チャネル(PCH)の機能チャネルで構成される。 For the control channel broadcast channel (BCCH), composed of function channel signal control channel (SCCH), paging channel (PCH). なお、制御チャネルにおける機能チャネル配置の一例は図6示すように、1スーパーフレーム中の特定のフレームに配置される。 Incidentally, an example of a functional channel arrangement in the control channel, as shown FIG. 6, are arranged in a particular frame in one superframe. 無線端末局は、待ち受け時にネットワークの制御情報・呼出情報等を得るため、 The wireless terminal station, in order to obtain control information and paging information such as a network at the time of standby,
制御チャネルのBCCH及びPCHの監視を行うが、消費電力軽減のため、あらかじめ定めた待ち受けに最低限必要なフレーム以外では受信機の電源をOFFにする間欠受信を行っている。 It monitors the BCCH and PCH control channels, since the power consumption reduced, performing discontinuous reception to OFF the receiver except minimum required frame waiting predetermined. 間欠受信の一例を図7に示す。 FIG. 7 shows an example of discontinuous reception. すなわち、 That is,
特定のタイミング以外では受信部は動作していないことから、一例として図8網掛け部のタイミングで、無線基地局のサービスエリア内に位置する無線端末局の受信周波数を無線端末局間直接通信用周波数に切替えることにより、サービスエリア外に位置する無線端末局の接続要求を受信する事が可能となる。 Since no work reception unit other than the specific timing, in the timing of FIG. 8 shaded areas as an example, for communication reception frequency directly between wireless terminal stations of the wireless terminal stations located within the service area of ​​the radio base station by switching the frequency, it is possible to receive a connection request of the wireless terminal station located outside the service area. 次に、無線基地局のサービスエリア外に位置する無線端末局は、無線基地局のサービスエリア内に移動した事を認識し、自動的に受信周波数を無線基地局が送信する周波数に切替える為に、周期的に制御チャネル周波数のスキャンを行い、規定受信レベル以上の無線基地局が存在するか確認する。 Next, the wireless terminal station located outside the service area of ​​the radio base station recognizes that it has moved into the service area of ​​the wireless base station, automatically to switch the reception frequency to the frequency of the radio base station transmits periodically scans for control channel frequency, to see if there are prescribed reception level or more radio base stations. また、 Also,
無線基地局のサービスエリア内に位置する無線端末局に対して接続を要求する場合、サービスエリア内に位置する無線端末局が無線端末局間直接通信用周波数に切替わるタイミング、すなわち図8の網掛け部のタイミングで接続要求を行う事により、接続要求信号のフレーム同期をとるための同期バースト等を付加することなく、確実に接続することが可能となる。 When requesting a connection to the wireless terminal station located within the service area of ​​the radio base station, it switched timing wireless terminal stations located within the service area in the direct communication frequencies between wireless terminal stations, i.e. the network of FIG. 8 by performing a connection request at the timing of the hanging portion, without adding a synchronization burst like for establishing frame synchronization of the connection request signal, it is possible to reliably connect. 【0006】 【発明の効果】本発明によれば、GPSによる時刻基準情報を元に無線基地局が送信する信号と無線端末局間直接通信用周波数を交互に監視することにより、無線基地局が送信する信号を受信する受信部及び無線端末局間直接通信用の周波数を受信する受信機を2つ用いることなく、無線基地局を介した通信の呼出し及び無線基地局を介さず無線端末局間直接通信用周波数による呼出しの双方に対応可能となり、通信システムの信頼性と使用効率を向上することができる。 [0006] According to the present invention, by the radio base station based on the time reference information by the GPS monitors alternating signal and direct communication frequencies between wireless terminal stations to be transmitted, the radio base station without using two receivers for receiving the frequency of the receiver and the wireless terminal station between direct communication receiving a signal to be transmitted, between wireless terminal stations without through the call and a radio base station of the communication via the radio base station by direct communication frequency becomes possible to cope with both of the calls, it is possible to improve the use efficiency and reliability of the communication system. 更に、無線端末局が無線基地局のサービスエリアを外れた場合及びサービスエリア外に位置する無線端末局が無線基地局のサービスエリア内に移動した際、周波数の切替えを自動化することにより、従来の場合の切替え忘れによる通信不能状態を事実上皆無にすることができる。 Furthermore, when the wireless terminal station which the wireless terminal station is located in and out of the service area when outside the service area of ​​the radio base station moves into the service area of ​​the radio base station, by automating the switching frequency, the prior art a communication impossible state due to the switching forgetting may be virtually nil when.

【図面の簡単な説明】 【図1】移動通信システムの一構成例を示すブロック図【図2】従来の移動通信システムにおける一実施例の接続制御を示すフローチャート【図3】本発明のデジタル移動通信システムにおける一実施例の接続制御を示すフローチャート【図4】本発明における同期手段の一構成例を示すブロック図【図5】FDMA無線システムのフレーム構成例を示す図【図6】FDMA無線システムの制御チャネルにおける機能チャネル配置例を示す図【図7】FDMA無線システムの間欠受信時の電源ON/O Digital mobile BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a connection control of an embodiment of the moving block diagram showing a configuration example of a communication system Figure 2 conventional mobile communication system the present invention; FIG Figure 6 FDMA wireless system showing a frame structure example of a block diagram Figure 5 FDMA wireless system showing a configuration example of the synchronization means in one flow chart illustrating a connection control in embodiment 4 of the present invention in a communication system power ON / O of FIG. 7 during the intermittent reception of the FDMA wireless system showing the functional channel arrangement example in the control channel
FFタイミングの一例を示す図【図8】本発明における無線端末局間直接通信用周波数切替えタイミングの一例を示す図【符号の説明】 101:制御装置、102〜104:無線基地局、10 [Description of symbols is a diagram showing an example of direct communication frequency switching timing between wireless terminal stations in FIG. 8 the invention showing an example of a FF Timing 101: controller, 102 to 104: a radio base station, 10
5〜110:無線端末局、201:GPS受信機又は標準電波受信機、202:無線装置、203:同期維持回路 5 to 110: the wireless terminal station, 201: GPS receiver or standard wave receiver, 202: Radio device 203: synchronization maintenance circuit

Claims (1)

  1. 【特許請求の範囲】 【請求項1】無線通信回線の制御を行う制御装置と、該制御装置の制御のもとに無線端末局間の無線通信の中継とサービスエリアの維持を行う無線基地局と、該無線基地局を介して無線通信を行う1つ以上の無線端末局を含むデジタル移動通信システムにおいて、前記無線基地局のサービスエリア外で無線基地局を介さずに、所定の無線端末局が他の無線端末局と相互に直接通信する手段を備えた無線端末局で、該無線端末局が基地局エリア内からエリア外に移動したとき、受信周波数を無線基地局が送信する周波数から移動局間直接通信用の周波数に自動的に切替える手段と、移動局間直接通信用の周波数に設定された無線端末局で、無線基地局のエリア外からエリア内に移動したとき、自動的に当該無線基地局の送受 Claims: 1. A control device for controlling the radio communication line, a wireless base station that performs maintenance of the original to the relay and the service area of ​​the wireless communication between wireless terminal stations of the control of the control device When, in a digital mobile communication system including one or more terminal stations for performing wireless communication through the wireless base station, without through the wireless base station in a service area outside of the radio base station, a predetermined terminal stations moving but the wireless terminal station having a means for communicating directly with each other with other terminal stations, when the wireless terminal station has moved outside the area of ​​the base station area, the reception frequency from the frequency of the radio base station transmits and automatically switching means directly to the frequency for communication between stations, the wireless terminal station which is set to a frequency for communication between the mobile station directly, when moved from outside the area of ​​the radio base stations in the area, automatically the transmission and reception of radio base stations 信周波数に切替える手段を合わせ持ったことを特徴としたデジタル移動通信システム。 Digital mobile communication system characterized by having both a means for switching the signal frequency. 【請求項2】前記請求項1のデジタル移動通信システムにおいて、全地球航空測位システムの受信機からの時間情報又は、標準電波受信機からの時間情報を共通時刻基準として時刻基準を正確に維持する同期維持手段を有し、前記時刻基準を元にして所定のタイミングによって無線基地局の周波数と移動局間直接通信用に割当てられた周波数を交互に受信する手段を有し、無線基地局のエリア内において、無線基地局が送信する周波数での呼出し及び移動局間直接通信用周波数での呼出し双方に対応可能としたことを特徴としたデジタル移動通信システム。 Wherein in the first aspect of the digital mobile communication system, the time information from the receiver of the global aviation positioning system or to maintain correct time based on the time information from the standard radio wave receiver as a common time reference has a synchronization maintaining means comprises means for receiving a frequency assigned by the predetermined timing based on the time reference for the communication frequency and the inter-mobile station direct radio base station alternately, area of ​​the radio base station in inner, a digital mobile communication system, characterized in that the radio base station is possible to cope with a call both in the call and between the mobile station direct communication frequencies in a frequency to be transmitted.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006222489A (en) * 2005-02-08 2006-08-24 Hitachi Kokusai Electric Inc Digital wireless system and its synchronization method
JP2008526161A (en) * 2005-01-26 2008-07-17 アジア パシフィック サテライト インダストリーズ カンパニー リミテッド Satellite communication apparatus and method capable satellite communications are decorated in a terrestrial mobile terminal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008526161A (en) * 2005-01-26 2008-07-17 アジア パシフィック サテライト インダストリーズ カンパニー リミテッド Satellite communication apparatus and method capable satellite communications are decorated in a terrestrial mobile terminal
JP4688884B2 (en) * 2005-01-26 2011-05-25 アジア パシフィック サテライト インダストリーズ カンパニー リミテッド Satellite communication apparatus and method capable satellite communications are decorated in a terrestrial mobile terminal
JP2006222489A (en) * 2005-02-08 2006-08-24 Hitachi Kokusai Electric Inc Digital wireless system and its synchronization method

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