JP2003111139A - Control channel switching system - Google Patents

Control channel switching system

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Publication number
JP2003111139A
JP2003111139A JP2001298962A JP2001298962A JP2003111139A JP 2003111139 A JP2003111139 A JP 2003111139A JP 2001298962 A JP2001298962 A JP 2001298962A JP 2001298962 A JP2001298962 A JP 2001298962A JP 2003111139 A JP2003111139 A JP 2003111139A
Authority
JP
Japan
Prior art keywords
control channel
mobile station
base station
station
mobile stations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001298962A
Other languages
Japanese (ja)
Inventor
Koji Yamashita
浩司 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kokusai Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP2001298962A priority Critical patent/JP2003111139A/en
Publication of JP2003111139A publication Critical patent/JP2003111139A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To make not only the communication between mobile stations through a base station but also the direct communication between the mobile stations easily performable, in a digital radio system containing the base station and a plurality of mobile stations connected to each other through the base station and radio channels. SOLUTION: Not only a period in which PCH (call information) can be received through a control channel for base station communication but also a period in which a synchronizing signal can be received from a call originating mobile station through a control channel for direct communication are provided by shortening the sleep (nonreceiving states) of the mobile stations. In addition, mobile stations which are not in busy states automatically switch control channels (control channels for base station communication and control channels for direct communication) at the same timing.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、デジタル方式無線
システムにおける移動局の制御チャネル切替に係り、更
に詳しくは、基地局通信用制御チャネルと直接通信用制
御チャネルとの切替に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control channel switching of mobile stations in a digital radio system, and more particularly to switching between a base station communication control channel and a direct communication control channel.

【０００２】[0002]

【従来の技術】以下、従来の一例である制御チャネル切
替方式について図２、３を参照して説明する。図２は従
来の一例である制御チャネル切替方式を示す移動局のタ
イムチャートである。図３は、デジタル方式無線システ
ムの構成の一例を示すブロック図である。同図において
１は統制台、２は回線制御装置、３は基地局無線装置、
４〜６は移動局である。2. Description of the Related Art A conventional control channel switching system will be described below with reference to FIGS. FIG. 2 is a time chart of a mobile station showing a conventional control channel switching system. FIG. 3 is a block diagram showing an example of the configuration of a digital wireless system. In the figure, 1 is a control console, 2 is a line control device, 3 is a base station radio device,
4 to 6 are mobile stations.

【０００３】従来の制御チャネル切替方式において、基
地局無線装置３から常に送信されている信号を移動局４
〜６は図２に示すように基地局通信用制御チャネルで間
欠受信している。即ち、一定の間隔で基地局無線装置３
からの信号を受信している。基地局無線装置３からの信
号を受信していないとき、無線機の消費電力低減のた
め、スリープ状態（受信していない状態。以下、スリー
プ状態と称する。）になっている。基地局無線装置３か
らの信号は１８フレームを１スーパーフレームとしてい
ると共に、報知情報（ＢＣＣＨ）、呼出情報（ＰＣ
Ｈ）、システム拡張情報（ＳＣＣＨ）から構成されてい
る。これらの情報の内、移動局４〜６は１フレームであ
る呼出情報（ＰＣＨ）の有無を検出している。残り１７
フレームにおいて移動局４〜６はスリープ状態となって
いる。呼出情報（ＰＣＨ）には移動局４〜６への呼出情
報または情報受信要求が含まれているので、呼出情報
（ＰＣＨ）を受信すれば移動局４〜６は着信動作へ移行
し、基地局経由の通信を行うことができる。In the conventional control channel switching system, the signal constantly transmitted from the base station radio unit 3 is transmitted to the mobile station 4
6 to 6 are intermittently received on the base station communication control channel as shown in FIG. That is, the base station wireless device 3 is set at regular intervals.
Is receiving a signal from. When the signal from the base station wireless device 3 is not received, it is in a sleep state (a state in which it is not received. Hereinafter, referred to as a sleep state) in order to reduce power consumption of the wireless device. The signal from the base station wireless device 3 has 18 frames as one superframe, and broadcast information (BCCH) and call information (PC).
H) and system extension information (SCCH). Of these pieces of information, the mobile stations 4 to 6 detect the presence or absence of call information (PCH) which is one frame. 17 remaining
In the frame, the mobile stations 4 to 6 are in the sleep state. Since the paging information (PCH) includes the paging information or the information reception request to the mobile stations 4 to 6, when the paging information (PCH) is received, the mobile stations 4 to 6 shift to the receiving operation and the base station. Communication can be performed.

【０００４】一方、移動局４または移動局５が移動局６
と移動局間直接通信を行う場合、直接通信用制御チャネ
ルで回線接続をする必要がある。しかし、直接通信用制
御チャネルは基地局通信用制御チャネルと異なるため、
図２に示すように移動局扱者（移動局４または移動局５
の扱者）が操作して、基地局通信用制御チャネルから直
接通信用制御チャネルへ切り替える。直接通信用制御チ
ャネルで移動局６を呼び出すかまたは移動局６から呼び
出されるのを待ち受けることにより、移動局間直接通信
が可能となる。例えば、移動局４または移動局５は移動
局６からの同期信号内の同期バーストを受信したとき、
同期引き込みをすることによって呼出信号を受信する。
移動局４または移動局５への呼出であるのならば、着信
動作へ移行する。一方、移動局４または移動局５への呼
出でないのならば、そのまま待受状態となる。On the other hand, the mobile station 4 or 5 is replaced by the mobile station 6
When performing direct communication between the mobile station and the mobile station, it is necessary to connect the line with the control channel for direct communication. However, since the control channel for direct communication is different from the control channel for base station communication,
As shown in FIG. 2, a mobile station operator (mobile station 4 or mobile station 5
The operator) operates to switch from the base station communication control channel to the direct communication control channel. By calling the mobile station 6 on the direct communication control channel or waiting for the call from the mobile station 6, direct communication between mobile stations becomes possible. For example, when mobile station 4 or mobile station 5 receives a sync burst in the sync signal from mobile station 6,
The ringing signal is received by performing the synchronization pull-in.
If the call is to the mobile station 4 or the mobile station 5, the operation shifts to a call reception operation. On the other hand, if the call is not to the mobile station 4 or the mobile station 5, the mobile station 4 enters the standby state as it is.

【０００５】[0005]

【発明が解決しようとする課題】前述の従来の制御チャ
ネル切替方式では通常、基地局通信用制御チャネルにな
っているので、基地局経由での移動局同士の通信は容易
に行うことができる。しかし、移動局間直接通信を行う
ことは容易にはできない。その理由として、移動局が相
手局（他の移動局）を直接呼び出すか、または相手局
（他の移動局）から直接呼び出されるのを待っている
（待機中である）とき、相手局（他の移動局）も直接通
信用制御チャネルに切り替えられてなければならない必
要があるからである。従って、全移動局の扱者全員があ
らかじめ示し合わせておかないと、自局（移動局）と相
手局（他の移動局）とで移動局間直接通信を行うことが
できないという欠点がある。そこで本発明では、この欠
点を除去し、基地局経由での移動局同士の通信だけでな
く、移動局間直接通信を容易に行うことができるように
することを目的とする。In the above-mentioned conventional control channel switching system, the control channel for base station communication is usually used, so that the mobile stations can easily communicate with each other via the base station. However, direct communication between mobile stations is not easy. The reason is that when the mobile station directly calls the partner station (other mobile station) or is waiting (waiting) to be called directly from the partner station (other mobile station), the partner station (other This is because it is necessary that the mobile station of the above) also be directly switched to the control channel for communication. Therefore, there is a disadvantage that direct communication between mobile stations cannot be performed between the own station (mobile station) and the partner station (other mobile station) unless all the operators of all mobile stations indicate in advance. Therefore, an object of the present invention is to eliminate this drawback and facilitate not only communication between mobile stations via a base station but also direct communication between mobile stations.

【０００６】[0006]

【課題を解決するための手段】本発明では前述の目的を
達成するために、移動局のスリープ状態（受信していな
い状態）を短くし、直接通信用制御チャネルで相手局
（他の移動局）と通信する期間を設けるようにしたもの
である。更に、通話状態またはデータ伝送状態にない移
動局は全て同じタイミングで制御チャネルを自動的に切
り替えるようにしたものである。即ち、下記切替タイミ
ングが同じとなるようにしたものである。 ・直接通信用制御チャネルへの切替タイミング ・基地局通信用制御チャネルへの切替タイミングIn order to achieve the above-mentioned object, the present invention shortens the sleep state (state in which the mobile station is not receiving) of the mobile station and uses the control channel for direct communication to communicate with the other station (other mobile stations). ) Is to establish a period to communicate with. Further, all the mobile stations that are not in the call state or the data transmission state automatically switch the control channel at the same timing. That is, the following switching timings are the same. -Timing for switching to the control channel for direct communication-Timing for switching to the control channel for base station communication

【０００７】[0007]

【発明の実施の形態】以下、本発明の一実施例である制
御チャネル切替方式について図１、３を参照して説明す
る。図１は本発明の一実施例である制御チャネル切替方
式を示す移動局のタイムチャートである。図３は、デジ
タル方式無線システムの構成の一例を示すブロック図で
ある。同図において１は統制台、２は回線制御装置、３
は基地局無線装置、４〜６は移動局である。BEST MODE FOR CARRYING OUT THE INVENTION A control channel switching system according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a time chart of a mobile station showing a control channel switching system according to an embodiment of the present invention. FIG. 3 is a block diagram showing an example of the configuration of a digital wireless system. In the figure, 1 is a control console, 2 is a line control device, and 3
Are base station wireless devices, and 4 to 6 are mobile stations.

【０００８】本デジタル方式無線システムについて、図
３を用いて説明する。基地局無線装置３は基地局通信用
制御チャネルで常時送信しており、移動局４〜６は、基
地局無線装置３から送信信号を基地局通信用制御チャネ
ルで間欠受信している。即ち、一定の間隔で基地局無線
装置３からの送信信号を受信している。更に移動局６が
発信移動局であるとき、移動局６からの送信信号を直接
通信用制御チャネルで移動局４及び移動局５は間欠受信
している。即ち、一定の間隔で移動局６からの送信信号
を受信している。This digital radio system will be described with reference to FIG. The base station wireless device 3 always transmits on the base station communication control channel, and the mobile stations 4 to 6 intermittently receive the transmission signal from the base station wireless device 3 on the base station communication control channel. That is, the transmission signal from the base station wireless device 3 is received at regular intervals. Further, when the mobile station 6 is the originating mobile station, the mobile station 4 and the mobile station 5 are intermittently receiving the transmission signal from the mobile station 6 through the direct communication control channel. That is, the transmission signal from the mobile station 6 is received at regular intervals.

【０００９】次に、本実施例の制御チャネル切替方式で
の各移動局の動作について、図１を用いて説明する。待
受中移動局である移動局４及び移動局５、発信移動局で
ある移動局６は図１（１）に示すように同じタイミング
で制御チャネル切替（基地局通信用制御チャネルから直
接通信用制御チャネルへの切替、直接通信用制御チャネ
ルからスリープ状態への切替、スリープ状態から基地局
通信用制御チャネルへの切替）を行っている。基地局通
信用制御チャネルでは基地局からの送信信号を１フレー
ムだけ受信できる状態となっており、基地局からの呼出
情報（ＰＣＨ）を受信したとき、基地局と回線接続す
る。一方、基地局からの呼出情報（ＰＣＨ）を受信しな
かったとき、直接通信用制御チャネルに切り替える。直
接通信用制御チャネルでは他の移動局からの送信信号を
５フレームだけ受信できる状態となっており、他の移動
局からの同期信号を受信したとき、他の移動局（同期信
号を送信した移動局）と回線接続する。他の移動局から
の同期信号を受信してことによって他の移動局（同期信
号を送信した移動局）と回線接続するときの動作につい
ては、後で詳細に説明する。他の移動局からの同期信号
を受信しなかったとき、スリープ状態に切り替える。１
２フレームだけスリープ状態となった後、基地局通信用
制御チャネルに切り替える。以上のように、基地局通信
用制御チャネルで１フレーム、直接通信用制御チャネル
で５フレーム、スリープ状態で１２フレームであるた
め、合計１８フレームで移動局の受信動作が構成されて
いる。制御チャネルでは、１８フレームを１スーパーフ
レームとしている。Next, the operation of each mobile station in the control channel switching system of this embodiment will be described with reference to FIG. As shown in FIG. 1A, the control channels of the mobile station 4 and the mobile station 5, which are the standby mobile stations, and the mobile station 6, which is the originating mobile station, are switched at the same timing (from the control channel for base station communication to direct communication). Switching to the control channel, switching from the direct communication control channel to the sleep state, and switching from the sleep state to the base station communication control channel) are performed. The base station communication control channel is in a state of being able to receive only one frame of the transmission signal from the base station, and when the call information (PCH) from the base station is received, the base station is connected to the line. On the other hand, when the call information (PCH) from the base station is not received, it is switched to the direct communication control channel. The control channel for direct communication is in a state of being able to receive the transmission signal from another mobile station for only 5 frames, and when the synchronization signal from the other mobile station is received, the other mobile station (the mobile station that transmitted the synchronization signal Station). The operation when receiving a synchronization signal from another mobile station and thereby establishing a line connection with another mobile station (a mobile station that has transmitted the synchronization signal) will be described in detail later. When it does not receive a synchronization signal from another mobile station, it switches to a sleep state. 1
After only 2 frames are in the sleep state, the base station communication control channel is switched to. As described above, since the base station communication control channel has one frame, the direct communication control channel has five frames, and the sleep state has twelve frames, a total of 18 frames constitute the reception operation of the mobile station. In the control channel, 18 frames are 1 superframe.

【００１０】次に、移動局が他の移動局からの同期信号
を受信してことによって他の移動局（同期信号を送信し
た移動局）と回線接続するときの動作について説明す
る。図１（２）に示すように、発信移動局（移動局６）
がスリープ状態のときに発信起動をかけると起動処理を
行う。そして、直接通信用制御チャネルに切り替えられ
たとき、発信移動局（移動局６）は同期信号を送信す
る。例えば、発信移動局（移動局６）が待受中である移
動局４を呼び出していたとき、移動局４は同期信号を受
信する。直接通信用制御チャネルでの受信期間は５フレ
ームであるが、この５フレームの内、２フレーム以上の
同期バースト（同期信号）を受信したとき、発信移動局
（移動局６）からの呼出があったものとして、移動局４
は発信移動局（移動局６）からの呼出があるか否かを一
定時間、直接通信用制御チャネルで監視する。発信移動
局（移動局６）からの呼出があったとき、移動局４は着
信応答動作へ移行する。一方、発信移動局（移動局６）
からの呼出がなかったとき、図１（１）に示すように、
制御チャネル切替を行っている状態へ動作を移行する。
但し、基地局からの送信信号を間欠受信するためには、
再度、同期を確立させるために報知情報（ＢＣＣＨ）を
受信する必要がある。報知情報（ＢＣＣＨ）は基地局か
らの送信信号の構成要素である。送信信号は、報知情報
（ＢＣＣＨ）と呼出情報（ＰＣＨ）、システム拡張情報
（ＳＣＣＨ）から構成されている。Next, the operation when the mobile station connects to another mobile station (the mobile station which has transmitted the synchronization signal) by receiving the synchronization signal from the other mobile station will be described. As shown in FIG. 1 (2), the originating mobile station (mobile station 6)
If is activated in the sleep state, the activation process is performed. Then, when switched to the direct communication control channel, the originating mobile station (mobile station 6) transmits a synchronization signal. For example, when the originating mobile station (mobile station 6) is calling the waiting mobile station 4, the mobile station 4 receives the synchronization signal. The reception period on the direct communication control channel is 5 frames, but when a synchronization burst (synchronization signal) of 2 or more frames is received out of these 5 frames, there is a call from the originating mobile station (mobile station 6). Mobile station 4
Monitors whether there is a call from the originating mobile station (mobile station 6) for a certain period of time on the direct communication control channel. When there is a call from the originating mobile station (mobile station 6), the mobile station 4 shifts to the incoming call answering operation. On the other hand, the originating mobile station (mobile station 6)
When there is no call from, as shown in Fig. 1 (1),
The operation shifts to the state where the control channel is switched.
However, in order to intermittently receive the transmission signal from the base station,
It is necessary to receive the broadcast information (BCCH) again to establish the synchronization. Broadcast information (BCCH) is a component of a transmission signal from the base station. The transmission signal is composed of broadcast information (BCCH), call information (PCH), and system extension information (SCCH).

【００１１】以上のように本実施例の制御チャネル切替
方式では、各移動局が同じタイミングで制御チャネル切
替を自動的に行うことができるようになったため、基地
局との回線接続だけでなく移動局同士の回線接続も容易
に行うことができる。従って、基地局経由での移動局同
士の通信だけでなく、移動局間直接通信を容易に行うこ
とができる。As described above, in the control channel switching system of this embodiment, since each mobile station can automatically switch the control channel at the same timing, it is possible to move not only the line connection with the base station but also the mobile station. Line connection between stations can be easily performed. Therefore, not only communication between mobile stations via the base station but also direct communication between mobile stations can be easily performed.

【００１２】[0012]

【発明の効果】以上のように本発明によれば、移動局は
制御チャネル切替を手動ではなく自動的に行うことがで
きるようにすると共に、制御チャネル切替タイミングが
各移動局で同じとなるようにしたことにより、基地局経
由での移動局同士の通信だけでなく、移動局間直接通信
を容易に行うことができる。As described above, according to the present invention, the mobile station can automatically perform the control channel switching instead of the manual operation, and the control channel switching timing can be the same for each mobile station. By doing so, not only communication between mobile stations via the base station but also direct communication between mobile stations can be easily performed.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例である制御チャネル切替方式
を示す移動局のタイムチャートFIG. 1 is a time chart of a mobile station showing a control channel switching system according to an embodiment of the present invention.

【図２】従来の一例である制御チャネル切替方式を示す
移動局のタイムチャートFIG. 2 is a time chart of a mobile station showing a conventional control channel switching system.

【図３】デジタル方式無線システムの構成の一例を示す
ブロック図FIG. 3 is a block diagram showing an example of the configuration of a digital wireless system.

【符号の説明】[Explanation of symbols]

１：統制局 ２：回線制
御装置 ３：基地局無線装置 ４〜６：移
動局1: Control station 2: Line control device 3: Base station radio device 4 to 6: Mobile station

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】基地局と、該基地局と無線回線を介して接
続される複数の移動局とを含むデジタル方式無線システ
ムの制御チャネル切替方式において、 前記移動局が、直接通信用制御チャネルで他の移動局か
らの同期信号を受信するかまたは他の移動局へ前記同期
信号を送信する期間を備えたことを特徴とする制御チャ
ネル切替方式。1. A control channel switching system of a digital radio system including a base station and a plurality of mobile stations connected to the base station via a radio line, wherein the mobile station uses a direct communication control channel. A control channel switching system comprising a period for receiving a synchronization signal from another mobile station or transmitting the synchronization signal to another mobile station. 【請求項２】請求項１記載の制御チャネル切替方式にお
いて、 全ての前記移動局が、前記基地局通信用制御チャネルで
前記基地局からの呼出情報を受信する期間に切り替わる
タイミングと、前記直接通信用制御チャネルで前記同期
信号を送受信する期間に切り替わるタイミングが同じと
なるようにし、 前記基地局との通信と前記移動局間直接通信とを容易に
行うようにしたことを特徴とする制御チャネル切替方
式。2. The control channel switching system according to claim 1, wherein all the mobile stations switch to a period for receiving call information from the base station on the base station communication control channel, and the direct communication. The control channel switching is characterized in that the timing for switching to the period for transmitting and receiving the synchronization signal on the control channel for transmission is the same, and the communication with the base station and the direct communication between the mobile stations are easily performed. method.
JP2001298962A 2001-09-28 2001-09-28 Control channel switching system Pending JP2003111139A (en)

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Family Applications (1)

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