JPH05300078A - Tdma frame synchronization method between zones - Google Patents

Tdma frame synchronization method between zones

Info

Publication number
JPH05300078A
JPH05300078A JP4099987A JP9998792A JPH05300078A JP H05300078 A JPH05300078 A JP H05300078A JP 4099987 A JP4099987 A JP 4099987A JP 9998792 A JP9998792 A JP 9998792A JP H05300078 A JPH05300078 A JP H05300078A
Authority
JP
Japan
Prior art keywords
radio base
base station
tdma
tdma frame
zone
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.)
Withdrawn
Application number
JP4099987A
Other languages
Japanese (ja)
Inventor
Tokihiro Mishiro
時博 御代
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP4099987A priority Critical patent/JPH05300078A/en
Publication of JPH05300078A publication Critical patent/JPH05300078A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE:To synchronize a TDMA frame between adjacent radio base stations at all times without provision of a large sized equipment by providing a standard radio wave receiver in each radio base station so as to generate the TDMA frame. CONSTITUTION:A service area of a mobile communication network is divided into plural zones, each zone is provided with a radio base station(BS) and a mobile communication network is formed by allowing each radio base station makes transmission reception by using a mobile station in its own zone whose radio line is established and the TDMA(time division multiple access) system. Each radio base station in the mobile communication network is provided with a standard radio wave receiver 1, and each radio base station generates a TDMA frame by using a reception signal sent when the standard radio wave receiver 1 receives a predetermined time signal as a time reference signal. Thus, the TDMA frame is set to the synchronization state between zones.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、TDMA方式を用いる移動
通信ネットワークに関するものである。近年の移動通信
装置、特に携帯電話、コードレス電話などの需要増加に
は目ざましいものがある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication network using the TDMA system. In recent years, there has been a remarkable increase in demand for mobile communication devices, especially mobile phones and cordless phones.

【0002】一方、これらの移動通信に割り当てられる
無線周波数には限りがあり、需要の増加に応じきれない
状態が間もなく起きようとしている。この為、従来のア
ナログFM変調方式に変えて、加入者数を飛躍的に増大さ
せることが可能な通信方式の検討がなされている。
On the other hand, the radio frequencies assigned to these mobile communications are limited, and it is about to soon occur that a situation cannot be met in response to an increase in demand. Therefore, a communication system that can dramatically increase the number of subscribers is being studied in place of the conventional analog FM modulation system.

【0003】この様な通信方式の一つとして、TDMA( 時
分割多元接続) 方式があるが、この方式では一つの無線
周波数を複数の無線局が時分割的に共用するものであ
る。TDMA方式では、音声信号をデイジタル信号に変換し
た後、更に速度変換して、自局に割り当てられたタイム
スロットに送信するものである。受信は自局宛のタイム
スロットの信号を速度逆変換し、デイジタル信号をアナ
ログ音声信号に戻して出力する。
As one of such communication systems, there is a TDMA (Time Division Multiple Access) system. In this system, one radio frequency is shared by a plurality of radio stations in a time division manner. In the TDMA method, a voice signal is converted into a digital signal, the speed is further converted, and the signal is transmitted in a time slot assigned to the own station. For reception, the signal in the time slot destined for the local station is inversely converted in speed, and the digital signal is converted back into an analog audio signal and output.

【0004】一方、移動局が移動して他の無線基地局の
サービスエリア( ゾーン) に入った場合、TDMAフレーム
の同期が取れていなければ、移動先の無線基地局からの
受信信号に対して、再度、同期確立手順に従ってフレー
ム同期を取り直さなければならないが、同期が取れる迄
は通信が断になる。
On the other hand, when the mobile station moves and enters the service area (zone) of another radio base station, if the TDMA frame is not synchronized, the received signal from the destination radio base station is received. The frame synchronization must be re-established according to the procedure for establishing synchronization again, but the communication will be interrupted until the synchronization is established.

【0005】しかし、TDMAフレームの同期が取れていれ
ば、同期確立手順を実行することなく連続した通信が可
能となる。そこで、通信断を生じさせない様にする為、
大きな装置を設けることなく、隣接する無線基地局間
で、常時、TDMAフレームの同期が取れている様にするこ
とが必要である。
However, if the TDMA frames are synchronized, continuous communication is possible without executing the synchronization establishing procedure. Therefore, in order not to cause communication interruption,
It is necessary to ensure that TDMA frames are always synchronized between adjacent radio base stations without providing a large device.

【0006】[0006]

【従来の技術】図4は従来例のゾーン間TDMAフレーム同
期方法説明図である。図において、ザービスエリアを小
さなゾーンに分割し、それぞれのゾーンに無線基地局BS
1 〜BS3 が設けられている。そして、各無線基地局は自
ゾーン内にいる移動局に対してTDMA方式を用いて信号の
送受信を行なっている。
2. Description of the Related Art FIG. 4 is an explanatory diagram of a conventional inter-zone TDMA frame synchronization method. In the figure, the service area is divided into small zones, and the wireless base station BS
1 to BS 3 are provided. Then, each radio base station transmits / receives signals to / from the mobile stations in its own zone by using the TDMA method.

【0007】この時、移動局が隣接ゾーンに移動して
も、隣接ゾーンの無線基地局と連続して送受信が行なわ
れる様に、各無線基地局が送出するTDMAフレームは相互
に同期がとれていることが必要である。
At this time, even if the mobile station moves to the adjacent zone, the TDMA frames transmitted by the respective wireless base stations are synchronized with each other so that transmission / reception is continuously performed with the wireless base stations in the adjacent zone. Need to be present.

【0008】この為、図に示す様に、時間基準となる基
準無線基地局BSR を設け、ここから基準TDMAフレームを
送出させる。これにより、各無線基地局は、この基準TD
MAフレームに従属同期して生成した時間基準を用いてTD
MAフレームを生成し、このフレームを用いて自ゾーン内
の移動局と信号の送受信を行なう。
[0008] Therefore, as shown in the figure, provided the reference base station BS R as a time reference, thereby sending the reference TDMA frame here. As a result, each radio base station
TD using time reference generated in synchronization with MA frame
An MA frame is generated and signals are transmitted / received to / from mobile stations in the own zone using this frame.

【0009】この為、移動局が隣接ゾーンに移動して
も、同期確立手順を実行することなく、連続した通信が
できる。
Therefore, even if the mobile station moves to the adjacent zone, continuous communication can be performed without executing the synchronization establishing procedure.

【0010】[0010]

【発明が解決しようとする課題】ここで、1つの無線基
地局がサービス範囲とするゾーンの半径は数百メートル
から数キロメートル程度で、この様な無線基地局を多数
配置するゾーン方式の移動通信ネットワークでは、加入
できる移動局数を増加させる為、TDMA通信方式が導入さ
れようとしている。
Here, the radius of the zone covered by one radio base station is about several hundred meters to several kilometers, and zone type mobile communication in which a large number of such radio base stations are arranged is provided. In the network, the TDMA communication system is about to be introduced in order to increase the number of mobile stations that can join.

【0011】一方、移動局としては、あるゾーンを越え
て別のゾーンに入っても、通信の中断を起こさずに連続
して通信を行ないたいと云う強い希望がある。そこで、
隣接する無線基地局間でTDMAフレームの同期が取れてい
ることが条件となるが、無線基地局間でTDMAフレームの
同期を取る従来方法としては、上記の様に、時間基準と
なる基準無線基地局BSR を1局設け、各無線基地局がこ
の局に従属同期する方法である。
On the other hand, a mobile station has a strong desire to continuously communicate without interrupting communication even if the mobile station crosses one zone and enters another zone. Therefore,
The condition is that the TDMA frames are synchronized between adjacent wireless base stations, but the conventional method for synchronizing the TDMA frames between the wireless base stations is, as described above, a reference wireless base serving as a time reference. It provided a station BS R 1 station, a method for the radio base station to slave synchronization to the station.

【0012】この方法は、基準無線基地局に障害が発生
すると、時間基準が送出されないのでネットワークが障
害となってしまう。また、基準無線基地局の信号が全無
線基地局で受信できなければならないので、基準無線基
地局のサービス範囲が非常に大きくなり、対応して送信
出力が大きくなければならないと云う2つの問題があ
る。
In this method, when a reference radio base station fails, the time reference is not sent and the network becomes a failure. In addition, since the signals of the reference radio base station must be able to be received by all the radio base stations, the service range of the reference radio base station becomes very large, and the transmission output must be correspondingly large. is there.

【0013】本発明は、大きな装置を設けることなく、
隣接する無線基地局間で、常時、TDMAフレームの同期が
取れている様にすることを目的とする。
The present invention eliminates the need for a large device.
The purpose is to ensure that TDMA frames are always synchronized between adjacent radio base stations.

【0014】[0014]

【課題を解決するための手段】図1は本発明の原理構成
図である。図中、1は標準電波受信機、BSは無線基地
局、MSは移動局である。
FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 1 is a standard radio wave receiver, BS is a radio base station, and MS is a mobile station.

【0015】本発明は、それぞれの無線基地局に、標準
電波を受信できる標準電波受信機を設ける。そして、各
無線基地局は、標準電波受信機が予め定めた時間信号を
受信した時に送出する受信信号を時間基準に用いてTD
MAフレームを生成する。これにより、ゾーン間でTD
MAフレームが同期状態となる。
According to the present invention, each radio base station is provided with a standard radio wave receiver capable of receiving a standard radio wave. Then, each radio base station uses the received signal sent out when the standard radio receiver receives a predetermined time signal as a time reference, and uses the received signal as a time reference.
Generate an MA frame. This allows TD between zones
The MA frame is in synchronization.

【0016】[0016]

【作用】JJY は郵政省が送信する標準電波であり、2.5
MHz,5MHz,8MHz, 10MHz, 15MHz の各周波数で発射され
ているが、この電波の周波数精度は非常に高く、且つ日
本全国どこでも受信可能である。そこで、各無線基地局
がこの電波を受信して時間基準として利用すれば、基地
局間でTDMAフレームの同期を容易にとることが可能とな
る。
[Function] JJY is a standard radio wave transmitted by the Ministry of Post
It is emitted at each frequency of 5MHz, 5MHz, 8MHz, 10MHz, 15MHz, but the frequency accuracy of this radio wave is very high and it can be received anywhere in Japan. Therefore, if each radio base station receives this radio wave and uses it as a time reference, it becomes possible to easily synchronize the TDMA frames between the base stations.

【0017】本発明は、各無線基地局に標準電波受信機
を設ける。そして、各無線基地局は、標準電波受信機が
予め定めた時間信号を受信した時、出力する受信信号を
時間基準に用いてTDMAフレームを生成する。この時、各
局の時間基準は同期が取れているので、当然この時間基
準を用いて生成したTDMAフレームも無線基地間で同期が
とれた状態となる。
According to the present invention, each radio base station is provided with a standard radio wave receiver. Then, each radio base station generates a TDMA frame by using the received signal output when the standard radio receiver receives a predetermined time signal as a time reference. At this time, since the time reference of each station is synchronized, naturally the TDMA frame generated using this time reference is also in a synchronized state between the radio base stations.

【0018】これにより、大きな装置を設けることな
く、隣接する無線基地局間で、常時、TDMAフレームの同
期が取れている状態になる。
As a result, the TDMA frames are always synchronized between the adjacent radio base stations without providing a large device.

【0019】[0019]

【実施例】図2は本発明の実施例の説明図で、(a) は本
発明の実施例の構成図、(b) はTDMAフレームの説明図で
ある。図3は本発明のゾーン間TDMAフレーム同期方法説
明図である。 以下、図2,図3を説明する。
FIG. 2 is an explanatory diagram of an embodiment of the present invention, (a) is a configuration diagram of the embodiment of the present invention, and (b) is an explanatory diagram of a TDMA frame. FIG. 3 is an explanatory diagram of the inter-zone TDMA frame synchronization method of the present invention. Hereinafter, FIGS. 2 and 3 will be described.

【0020】先ず、図3において、無線基地局BSは、自
局と移動局MSの間をTDMA通信方式で接続すると云う従来
と同じTDMA接続機能を持つと共に、TDMAフレームの時間
基準を得る為のJJY 受信機1を持っている。
First, in FIG. 3, the radio base station BS has the same TDMA connection function as the conventional one in which the own base station and the mobile station MS are connected by the TDMA communication system, and the time base of the TDMA frame is obtained. I have JJY receiver 1.

【0021】そして、JJY 受信機の受信周波数を、例え
ば2.5MHzに選び、JJY 受信信号の出力をTDMAタイミング
制御部2の時間基準とする。全ての無線基地局は同一の
JJY信号を受信することになるので、JJY 受信信号の出
力タイミングは全て一致している。
Then, the reception frequency of the JJY receiver is selected to be 2.5 MHz, for example, and the output of the JJY reception signal is used as the time reference of the TDMA timing control section 2. All radio base stations are the same
Since the JJY signal will be received, the output timings of the JJY received signals all match.

【0022】次に、図2(a) に示す様に、TDMAタイミン
グ制御部内のタイミング発生部分21は、例えばカウンタ
から構成され、クロックをカウントし、カウント値をタ
イミング信号として送出している。
Next, as shown in FIG. 2 (a), the timing generation section 21 in the TDMA timing control section is composed of, for example, a counter, counts clocks, and sends the count value as a timing signal.

【0023】一方、JJY 受信機1は、予め定めた時間信
号を受信した時、受信信号を利用してリセット信号を生
成し、タイミング発生部分21に送出する。そこで、タイ
ミング発生部分は初期状態になり、この状態からカウン
ト動作を開始するが、この初期状態のタイミングを時間
基準( 図2(b) のR の部分) とする。
On the other hand, when the JJY receiver 1 receives a predetermined time signal, it generates a reset signal using the received signal and sends it to the timing generation section 21. Therefore, the timing generation portion is in the initial state, and the counting operation is started from this state. The timing of this initial state is used as the time reference (portion R in FIG. 2B).

【0024】なお、デイジタル信号が挿入されるタイム
スロットA, B・・・は、時間基準からの時間差が予め決
められているので、カウント値を利用して、それぞれの
タイムスロットの位置を示すタイミング信号を送出す
る。
Since the time difference from the time reference is predetermined for the time slots A, B ... In which the digital signal is inserted, the count value is used to determine the timing indicating the position of each time slot. Send a signal.

【0025】即ち、移動局の移動に伴い、別の基地局の
ゾーンに移動しても、TDMAフレーム同期は連続して保持
し続けられるので、無線基地局と移動局間の通信の中断
を起こすことはなくなる。
That is, even if the mobile station moves to the zone of another base station due to the movement of the mobile station, the TDMA frame synchronization is continuously maintained, so that the communication between the radio base station and the mobile station is interrupted. Things will disappear.

【0026】[0026]

【発明の効果】以上詳細に説明した様に本発明によれ
ば、大きな装置を設けることなく、隣接する無線基地局
間で、常時、TDMAフレームの同期が取れている様になる
と云う効果がある。
As described in detail above, according to the present invention, there is an effect that TDMA frames can always be synchronized between adjacent radio base stations without providing a large device. ..

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

【図1】本発明の原理構成図である。FIG. 1 is a principle configuration diagram of the present invention.

【図2】本発明の実施例の説明図で、(a) は本発明の実
施例の構成図、(b) はTDMAフレームの説明図である。
FIG. 2 is an explanatory diagram of an embodiment of the present invention, (a) is a configuration diagram of the embodiment of the present invention, and (b) is an explanatory diagram of a TDMA frame.

【図3】本発明のゾーン間TDMAフレーム同期方法説明図
である。
FIG. 3 is an explanatory diagram of an inter-zone TDMA frame synchronization method of the present invention.

【図4】従来例のゾーン間TDMAフレーム同期方法説明図
である。
FIG. 4 is an explanatory diagram of a conventional inter-zone TDMA frame synchronization method.

【符号の説明】[Explanation of symbols]

1 標準電波受信機 BS 無線基地
局 MS 移動局
1 Standard radio receiver BS radio base station MS mobile station

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 サービスエリアを複数のゾーンに分割
し、それぞれのゾーンに無線基地局(BS)を設け、各
無線基地局は、無線回線が確立した自ゾーン内の移動局
(MS)と、TDMA方式を用いて相互に信号の送受信
を行なう移動通信ネットワークにおいて、 それぞれの無線基地局に標準電波を受信できる標準電波
受信機(1) を設け、 各無線基地局は、該標準電波受信機が予め定めた時間信
号を受信した時に送出する受信信号を、時間基準に用い
てTDMAフレームを生成し、ゾーン間でTDMAフレ
ームが同期状態となる様にしたことを特徴とするゾーン
間TDMAフレーム同期方法。
1. A service area is divided into a plurality of zones, a radio base station (BS) is provided in each zone, and each radio base station has a mobile station (MS) in its own zone in which a radio line is established, In a mobile communication network that transmits and receives signals to and from each other using the TDMA method, each radio base station is provided with a standard radio wave receiver (1) that can receive the standard radio wave. An inter-zone TDMA frame synchronization method characterized in that a TDMA frame is generated by using a reception signal transmitted when a predetermined time signal is received as a time reference, and the TDMA frame is brought into a synchronization state between zones. ..
JP4099987A 1992-04-20 1992-04-20 Tdma frame synchronization method between zones Withdrawn JPH05300078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4099987A JPH05300078A (en) 1992-04-20 1992-04-20 Tdma frame synchronization method between zones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4099987A JPH05300078A (en) 1992-04-20 1992-04-20 Tdma frame synchronization method between zones

Publications (1)

Publication Number Publication Date
JPH05300078A true JPH05300078A (en) 1993-11-12

Family

ID=14262007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4099987A Withdrawn JPH05300078A (en) 1992-04-20 1992-04-20 Tdma frame synchronization method between zones

Country Status (1)

Country Link
JP (1) JPH05300078A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009111626A (en) * 2007-10-29 2009-05-21 Softbank Telecom Corp Interference reduction device of ip data wireless communication system for movable body; and wireless communication base station device and movable body terminal device using it
US8300623B2 (en) 2006-10-26 2012-10-30 Kyocera Corporation Frame synchronization method of OFDM communication system and receiver therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8300623B2 (en) 2006-10-26 2012-10-30 Kyocera Corporation Frame synchronization method of OFDM communication system and receiver therefor
JP2009111626A (en) * 2007-10-29 2009-05-21 Softbank Telecom Corp Interference reduction device of ip data wireless communication system for movable body; and wireless communication base station device and movable body terminal device using it

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Effective date: 19990706