JP3460695B2 - Wireless communication system and wireless relay device - Google Patents
Wireless communication system and wireless relay deviceInfo
- Publication number
- JP3460695B2 JP3460695B2 JP2000365137A JP2000365137A JP3460695B2 JP 3460695 B2 JP3460695 B2 JP 3460695B2 JP 2000365137 A JP2000365137 A JP 2000365137A JP 2000365137 A JP2000365137 A JP 2000365137A JP 3460695 B2 JP3460695 B2 JP 3460695B2
- Authority
- JP
- Japan
- Prior art keywords
- station
- relay
- mobile
- base station
- mobile station
- 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.)
- Expired - Fee Related
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- Time-Division Multiplex Systems (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、中継局を介した基
地局／移動局間の無線通信を行う無線通信システムおよ
び無線中継装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system and a wireless relay device for performing wireless communication between a base station and a mobile station via a relay station.
【０００２】[0002]
【従来の技術】従来の無線通信で用いられる不感地対策
のための中継器としては、アマチュア無線のレピータや
ＰＨＳ（Personal Handyphone System：簡易型携帯電話
システム）のホームアンテナ等がある。これらの中継器
は受信信号をそのまま増幅して出力するものであり、基
地局および携帯端末等の移動局を備えた従来の無線通信
システムにおいては、基地局／移動局間で送受信される
無線信号が複数の中継器を経由することはない。2. Description of the Related Art As a repeater for use in a dead zone countermeasure used in conventional radio communication, there are an amateur radio repeater and a home antenna of a PHS (Personal Handyphone System). These repeaters amplify a received signal as it is and output it. In a conventional wireless communication system including a base station and a mobile station such as a mobile terminal, a radio signal transmitted and received between the base station and the mobile station. Does not go through multiple repeaters.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の無線通信シ
ステムにあっては、不感地対策のため中継局を当該シス
テムに導入する際、複数の中継局からそれぞれ出力され
た信号同士が干渉しないよう各中継局をどこに配置する
か設計（置局設計）を行う必要があった。さらに、置局
設計の後はシミュレーションや実地試験等を行う必要も
ある。また、置局設計により設定された配置でシミュレ
ーションを行いそれが良好な結果を示したとしても、実
地試験ではあまり良い結果を示さないという場合もある
ため、このような場合は、置局設計を一部変更しなくて
はならない。In the above-mentioned conventional wireless communication system, when the relay station is introduced into the system as a countermeasure for the dead area, signals output from the plurality of relay stations do not interfere with each other. It was necessary to design where each relay station should be placed (station placement design). Furthermore, it is necessary to perform simulations and field tests after designing the station. In addition, even if a simulation is performed with the arrangement set by the station placement design and it shows good results, there are cases where it does not show very good results in the field test. Some changes have to be made.
【０００４】したがって、良好な回線品質または電波状
況を得ようとするためには、中継局の置局設計を綿密に
行う必要があり、中継局を設置する場所の調査や確保等
も含め、中継局の配置に多くの時間や費用を要するとい
う問題点があった。Therefore, in order to obtain a good line quality or radio wave condition, it is necessary to carefully design the placement of the relay station. There was a problem that it took a lot of time and cost to arrange the stations.
【０００５】本発明は、上記従来の問題点に鑑みてなさ
れたものであって、中継局の置局設計を簡便に行うこと
のできる無線通信システムおよび無線中継装置を提供す
ることを目的としている。The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a wireless communication system and a wireless relay device which can easily design a station of a relay station. .
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明の請求項１に係る無線通信システムは、基地
局と移動局との間で時分割多元接続方式による無線通信
を行う無線通信システムであって、前記基地局と前記移
動局との間に、前記基地局若しくは前記移動局とまたは
相互に通信可能な複数の中継局を備え、前記基地局と前
記中継局との間の通信は上り周波数と下り周波数がそれ
ぞれ異なり、前記中継局と前記移動局との間の通信は上
り周波数と下り周波数が同じであり、前記中継局は、前
記基地局からの下り信号に同期して前記移動局への送信
を行い、前記移動局は、前記基地局または前記中継局か
らの下り信号に同期して自局の受信タイミングおよび上
り送信タイミングを決定するものである。In order to solve the above problems, a radio communication system according to claim 1 of the present invention is a radio system for performing radio communication by a time division multiple access system between a base station and a mobile station. A communication system, comprising a plurality of relay stations capable of mutually communicating with the base station or the mobile station, between the base station and the mobile station, the base station and the front
Communication between the relay station depends on the upstream frequency and the downstream frequency.
Communication between the relay station and the mobile station is different.
And the downlink frequency is the same, the relay station is
Transmission to the mobile station in synchronization with the downlink signal from the base station
And the mobile station is the base station or the relay station.
The reception timing of the local station and the
It determines the transmission timing .
【０００７】また、請求項２に係る無線通信システム
は、基地局と移動局との間で時分割多元接続方式による
無線通信を行う無線通信システムであって、前記基地局
と前記移動局との間に、前記基地局若しくは前記移動局
とまたは相互に通信可能な複数の中継局を備え、前記複
数の中継局が前記基地局と前記移動局との間に多段に設
けられ、同一の段に位置する中継局が複数在り、前記基
地局と通信可能な同一の段に位置する各中継局と前記基
地局との間の通信は上り周波数と下り周波数がそれぞれ
異なり、前記基地局と通信可能な同一の段に位置する各
中継局と前記移動局と通信可能な同一の段に位置する各
中継局との間の通信は上り周波数と下り周波数が同じで
あり、前記移動局と通信可能な同一の段に位置する各中
継局と前記移動局との間の通信は上り周波数と下り周波
数が同じであり、前記移動局と通信可能な同一の段に位
置する各中継局は、前記基地局と通信可能な同一の段に
位置する各中継局が受信した前記基地局からの下り信号
に同期して前記移動局への送信を行い、前記移動局は、
前記基地局または前記移動局と通信可能な同一の段に位
置する各中継局からの下り信号に同期して自局の受信タ
イミングおよび上り送信タイミングを決定するものであ
る。A radio communication system according to a second aspect uses a time division multiple access system between a base station and a mobile station.
A wireless communication system for performing wireless communication, the base station
And the mobile station, the base station or the mobile station
DOO or comprising a cross plurality of relay stations that can communicate to the plurality of relay stations are provided in multiple stages between the mobile station and the base station, there are a plurality of relay stations located in the same stage, the group
Each relay station located at the same stage that can communicate with the ground station and the base
Communication with the ground station has an upstream frequency and a downstream frequency, respectively.
Differently, each of which is located in the same stage that can communicate with the base station
Each of the relay stations and the mobile stations located in the same stage that can communicate with the mobile station.
Communication between the relay station has the same upstream frequency and downstream frequency.
Yes, each middle located in the same stage that can communicate with the mobile station
Communication between the successor station and the mobile station is performed in the uplink frequency and the downlink frequency.
Have the same number and are in the same stage where they can communicate with the mobile station.
Place each relay station in the same stage where it can communicate with the base station.
Downlink signal from the base station received by each relay station located
To the mobile station in synchronization with, the mobile station,
Located at the same stage where it can communicate with the base station or the mobile station.
Receiver station in synchronization with the downlink signal from each relay station
It determines the timing of the imming and the upstream transmission .
【０００８】[0008]
【０００９】[0009]
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【００１４】[0014]
【００１５】[0015]
【００１６】[0016]
【００１７】[0017]
【００１８】[0018]
【００１９】[0019]
【００２０】[0020]
【００２１】[0021]
【００２２】[0022]
【００２３】[0023]
【００２４】[0024]
【００２５】[0025]
【００２６】[0026]
【００２７】このように、基地局（移動局）から送信さ
れた信号は中継局を介した複数の経路で移動局（基地
局）に送信されるため、基地局／移動局間の複数の通信
経路に通信障害が生じたときでも、最低１つの通信経路
が正常であれば基地局／移動局間の通信が可能となる。
したがって、中継局の置局設計を綿密に行う必要がなく
なる。また、複数の中継局のそれぞれは、移動局への信
号の送信を基地局からの下り信号に同期して同一の周波
数で行うため、該信号を受信する他局は、符号間干渉が
生じる程度まで著しく到着時刻がずれない限り一信号と
して正常に受信することができる。As described above, since the signal transmitted from the base station (mobile station) is transmitted to the mobile station (base station) through a plurality of routes via the relay station, a plurality of communication between the base station and the mobile station is performed. Even when a communication failure occurs in a route, if at least one communication route is normal, the base station / mobile station communication can be performed.
Therefore, it is not necessary to carefully design the placement of the relay station. In addition, each of the plurality of relay stations sends a message to the mobile station.
Signal transmission in synchronization with the downlink signal from the base station
Since it is performed by a number, other stations that receive the signal can normally receive it as one signal unless the arrival times are significantly shifted to the extent that intersymbol interference occurs.
【００２８】[0028]
【００２９】このように、基地局（移動局）から送信さ
れた信号は複数の中継局を介した送受信が可能なため、
基地局が実質的にカバーすることのできる通信エリアを
広げることができる。また、移動局と通信可能な同一の
段に位置する各中継局は移動局への信号の送信を基地局
と通信可能な同一の段に位置する各中継局が受信した基
地局からの下り信号に同期して同一の周波数で行うた
め、該信号を受信する他局は、符号間干渉が生じる程度
まで著しく到着時刻がずれない限り一信号として正常に
受信することができる。As described above, since the signal transmitted from the base station (mobile station) can be transmitted and received through a plurality of relay stations ,
The communication area that the base station can substantially cover can be expanded. The communication can be identical with the mobile station
Each relay station located in a row transmits signals to the mobile station by the base station.
The data received by each relay station located in the same stage that can communicate with
Since it is performed at the same frequency in synchronization with the downlink signal from the ground station, other stations that receive the signal normally operate as one signal unless the arrival times are significantly shifted to the extent that intersymbol interference occurs. Can be received.
【００３０】[0030]
【００３１】[0031]
【００３２】[0032]
【００３３】[0033]
【００３４】[0034]
【００３５】[0035]
【００３６】[0036]
【００３７】[0037]
【００３８】[0038]
【００３９】[0039]
【発明の実施の形態】以下、本発明の無線通信システム
の実施の形態について、〔第１の実施形態〕、〔第２の
実施形態〕、〔第３の実施形態〕、〔第４の実施形
態〕、〔第５の実施形態〕、〔第６の実施形態〕、〔第
７の実施形態〕の順に図面を参照して詳細に説明する。
なお、以下に説明する実施形態の無線通信システムは、
ＴＤＭＡ（Time Division Multiple Access：時分割多
元接続）方式で、特許請求の範囲の中継局および無線中
継装置に該当する移動中継局を介した基地局／移動局間
の無線通信を行うものである。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a wireless communication system of the present invention will be described below with reference to [First Embodiment], [Second Embodiment], [Third Embodiment] and [Fourth Embodiment]. Mode], [fifth embodiment], [sixth embodiment], and [seventh embodiment] will be described in detail with reference to the drawings.
In addition, the wireless communication system of the embodiment described below,
A TDMA (Time Division Multiple Access) method is used to perform wireless communication between a base station and a mobile station via a mobile relay station corresponding to the relay station and the wireless relay device in the claims.
【００４０】〔第１の実施形態〕図１は、第１の実施形
態の無線通信システムにおける通常動作（ａ）、中継動
作（ｂ）および分岐中継動作（ｃ）について説明する説
明図である。以下、図２を参照して、中継動作（ｂ）お
よび分岐中継動作（ｃ）で用いられる本実施形態の移動
中継局１０１ａ，１０１ｂ（以下、まとめて移動中継局
１０１と称す）の構成およびその動作について説明す
る。同図に示す移動中継局１０１は、アンテナ２０１
と、送受信切替部２０３と、復調部２０５と、特許請求
の範囲の信号蓄積手段に該当する蓄積中継部２０７と、
変調部２０９と、制御部２１１とを備えて構成されてい
る。[First Embodiment] FIG. 1 is an explanatory view for explaining a normal operation (a), a relay operation (b) and a branch relay operation (c) in a wireless communication system of the first embodiment. Hereinafter, with reference to FIG. 2, the configuration of the mobile relay stations 101a and 101b (hereinafter collectively referred to as the mobile relay station 101) used in the relay operation (b) and the branch relay operation (c) and their configurations. The operation will be described. The mobile relay station 101 shown in FIG.
A transmission / reception switching unit 203, a demodulation unit 205, a storage relay unit 207 corresponding to the signal storage unit in the claims,
The modulation unit 209 and the control unit 211 are provided.
【００４１】まず、送受信切替部２０３はアンテナ２０
１が無線信号を受信するタイミングで復調部２０５に接
続されているため、アンテナ２０１で受信した無線信号
は復調部２０５に送られる。復調部２０５は、無線信号
を復調して得られたデータを蓄積中継部２０７に送る。
蓄積中継部２０７は、復調部２０５から送られたデータ
を一時蓄積しておくためのバッファ的な役割を果たすも
のであり、変調部２０９から送られたデータを増幅する
増幅部（図示せず）を有していても良い。また、蓄積中
継部２０７は、蓄積しているデータを制御部２１１が指
示するタイミングで変調部２０９に送る。変調部２０９
は、蓄積中継部２０７から送られたデータを変調し、こ
れを送受信切替部２０３に送る。送受信切替部２０３は
変調データが送信されるタイミングで変調部２０９に接
続されているため、変調データは所定のタイミングでア
ンテナ２０１から送信される。First, the transmission / reception switching unit 203 uses the antenna 20.
Since No. 1 is connected to the demodulation unit 205 at the timing of receiving the radio signal, the radio signal received by the antenna 201 is sent to the demodulation unit 205. The demodulation unit 205 sends the data obtained by demodulating the wireless signal to the storage relay unit 207.
The storage relay unit 207 plays a role of a buffer for temporarily storing the data sent from the demodulation unit 205, and an amplification unit (not shown) that amplifies the data sent from the modulation unit 209. May have. Further, the storage relay unit 207 sends the stored data to the modulation unit 209 at the timing instructed by the control unit 211. Modulator 209
Modulates the data sent from the storage relay unit 207 and sends it to the transmission / reception switching unit 203. Since the transmission / reception switching unit 203 is connected to the modulation unit 209 at the timing of transmitting the modulation data, the modulation data is transmitted from the antenna 201 at a predetermined timing.
【００４２】なお、基地局１０３は、移動中継局１０１
が有する蓄積中継部２０７を除き、変調部２０９および
復調部２０５に通信ネットワーク（図示せず）が接続さ
れた構成である。また、移動局１０５は、移動中継局１
０１が有する蓄積中継部２０７を除き、マイクやカメラ
等の入力部と変調部２０９に接続されたエンコーダとを
備え、また、スピーカやモニタ等の出力部と復調部２０
５に接続されたデコーダを備えた構成となっている。The base station 103 is the mobile relay station 101.
A communication network (not shown) is connected to the modulation unit 209 and the demodulation unit 205 except for the storage relay unit 207 included in. In addition, the mobile station 105 is the mobile relay station 1
01 is provided with an input unit such as a microphone and a camera and an encoder connected to the modulation unit 209, and an output unit such as a speaker and a monitor and a demodulation unit 20.
It has a configuration including a decoder connected to 5.
【００４３】次に、第１の実施形態の無線通信システム
について説明する。図１に示すように、本実施形態の無
線通信システムにおける基地局／移動局間の無線信号の
通信形態は、通常動作（ａ）と中継動作（ｂ）と分岐中
継動作（ｃ）の３通りがある。まず、通常動作（ａ）で
は、基地局１０３と携帯端末等の移動局１０５は他局を
介さず直接通信を行う。本実施形態では、移動局１０５
から基地局１０３へ（上り）は周波数Ｆ１で無線信号が
伝送され、基地局１０３から移動局１０５へ（下り）は
周波数Ｆ２で無線信号が伝送される。Next, the radio communication system of the first embodiment will be described. As shown in FIG. 1, in the wireless communication system of the present embodiment, there are three communication modes of a wireless signal between a base station and a mobile station: a normal operation (a), a relay operation (b) and a branch relay operation (c). There is. First, in the normal operation (a), the base station 103 and the mobile station 105 such as a mobile terminal directly communicate with each other without passing through another station. In this embodiment, the mobile station 105
From the base station 103 to the base station 103 (uplink), a radio signal is transmitted at the frequency F1, and from the base station 103 to the mobile station 105 (downlink), a radio signal is transmitted at the frequency F2.
【００４４】また、中継動作（ｂ）では、基地局１０３
と移動局１０５との間に移動中継局１０１ａが設置され
ており、基地局１０３／移動局１０５間の通信は移動中
継局１０１ａを介して行われる。本実施形態では、基地
局１０３／移動中継局１０１ａ間は上りが周波数Ｆ１、
下りが周波数Ｆ２で伝送され、移動中継局１０１ａ／移
動局１０５間は上り下りとも周波数Ｆ３で伝送される。In the relay operation (b), the base station 103
The mobile relay station 101a is installed between the mobile station 105 and the mobile station 105, and communication between the base station 103 and the mobile station 105 is performed via the mobile relay station 101a. In the present embodiment, the frequency F1 between the base station 103 and the mobile relay station 101a is the uplink,
Downlink is transmitted at frequency F2, and between mobile relay station 101a and mobile station 105 is transmitted at frequency F3 both upstream and downstream.
【００４５】なお、本実施形態の中継動作（ｂ）では、
図３に示すように、４タイムスロット（スロットＡ〜
Ｄ）で基地局１０３／移動中継局１０１ａ／移動局１０
５間の無線信号の伝送を行っており、一タイムスロット
（以下、単にスロットという）毎に１：１の一方向通信
を行っている。図３に示す本実施形態の移動中継局１０
１ａは、４スロット中の２スロット（スロットＡ，Ｃ）
で基地局１０３との送受信を行い、残りの２スロット
（スロットＢ，Ｄ）で移動局１０５との送受信を行う。In the relay operation (b) of this embodiment,
As shown in FIG. 3, four time slots (slots A to
D) base station 103 / mobile relay station 101a / mobile station 10
Wireless signals are transmitted between the five wireless communication terminals, and one-way communication is performed 1: 1 for each time slot (hereinafter, simply referred to as a slot). The mobile relay station 10 of this embodiment shown in FIG.
1a is 2 slots out of 4 slots (slots A and C)
, And the mobile station 105 in the remaining two slots (slots B and D).
【００４６】次に、分岐中継動作（ｃ）では、基地局１
０３と移動局１０５との間に複数の移動中継局１０１
ａ，１０１ｂが設置されており、基地局１０３／移動局
１０５間の通信は移動中継局１０１ａまたは移動中継局
１０１ｂを介して行われる。本実施形態では、基地局１
０３／移動中継局１０１ａ間および基地局１０３／移動
中継局１０１ｂ間は上りが周波数Ｆ１、下りが周波数Ｆ
２で伝送され、移動中継局１０１ａ／移動局１０５間お
よび移動中継局１０１ｂ／移動局１０５間は上り下りと
も周波数Ｆ３で伝送される。Next, in the branch relay operation (c), the base station 1
03 and the mobile station 105, a plurality of mobile relay stations 101
a and 101b are installed, and the communication between the base station 103 and the mobile station 105 is performed via the mobile relay station 101a or the mobile relay station 101b. In this embodiment, the base station 1
03 / mobile relay station 101a and base station 103 / mobile relay station 101b, the frequency F1 is up and frequency F is down.
2 between the mobile relay station 101a and the mobile station 105 and between the mobile relay station 101b and the mobile station 105 at the frequency F3 in both up and down directions.
【００４７】特に、本実施形態の分岐中継動作（ｃ）で
は、基地局１０３から出力された下り信号は移動中継局
１０１ａ，１０１ｂの双方によって受信され、移動中継
局１０１ａ，１０１ｂの各局は受信データを同時に下り
送信する。また、移動局１０５から出力された上り信号
は移動中継局１０１ａ，１０１ｂの双方によって受信さ
れ、移動中継局１０１ａ，１０１ｂの各局は受信データ
を同時に上り送信する。なお、移動中継局１０１ａ，１
０１ｂが行う下り送信および上り送信のタイミングは、
各移動中継局が有する制御部２１１によって決定され
る。In particular, in the branch relay operation (c) of this embodiment, the downlink signal output from the base station 103 is received by both the mobile relay stations 101a and 101b, and the mobile relay stations 101a and 101b receive the received data. Are transmitted simultaneously at the same time. Further, the uplink signal output from the mobile station 105 is received by both the mobile relay stations 101a and 101b, and the mobile relay stations 101a and 101b simultaneously transmit the received data in uplink. The mobile relay stations 101a, 1a
The timing of downlink transmission and uplink transmission performed by 01b is
It is determined by the control unit 211 included in each mobile relay station.
【００４８】分岐中継動作（ｃ）の一例を図４に示す。
同図において、スロット０１では、基地局１０３が周波
数Ｆ２でデータを下り送信し、移動中継局１０１ａ，１
０１ｂの双方がこれを受信する。次に、スロット０２で
は、移動中継局１０１ａ，１０１ｂはスロット０１で受
信した受信データを周波数Ｆ３で同時に下り送信し、移
動局１０５が略同時にこれを受信する。スロット０４で
は、移動局１０５が周波数Ｆ３でデータを上り送信し、
移動中継局１０１ａ，１０１ｂの双方が略同時にこれを
受信する。移動中継局１０１ａ，１０１ｂは受信したデ
ータを一時蓄積した後、スロット０７で、蓄積していた
データを周波数Ｆ１で同時に上り送信し、基地局１０３
が略同時にこれを受信する。FIG. 4 shows an example of the branch relay operation (c).
In the figure, in slot 01, the base station 103 transmits data at the frequency F2 in the downlink, and the mobile relay stations 101a, 1a, 1
01b both receive this. Next, in slot 02, the mobile relay stations 101a and 101b simultaneously perform downlink transmission of the reception data received in slot 01 at the frequency F3, and the mobile station 105 receives it at substantially the same time. In slot 04, the mobile station 105 transmits data at frequency F3 in the uplink,
Both mobile relay stations 101a and 101b receive this substantially simultaneously. After the mobile relay stations 101a and 101b temporarily store the received data, the mobile relay stations 101a and 101b simultaneously perform uplink transmission of the stored data at the frequency F1 in the slot 07, and the base station 103
Will receive this at about the same time.
【００４９】このように、本実施形態の無線通信システ
ムは下り従属同期を行うシステムであって、移動中継局
１０１は、基地局１０３からの下り信号に同期して移動
局１０５への送信を行い、移動局１０５は、基地局１０
３または移動中継局１０１からの下り信号に同期して自
局の受信タイミングおよび上り送信タイミングを決定し
ている。また、本実施形態の無線通信システムにおける
分岐中継動作（ｃ）では、基地局１０３および移動局１
０５は移動中継局１０１ａ，１０１ｂからの各無線信号
を略同時に受信するが、基地局１０３や移動局１０５で
受信された無線信号は全く同じ内容の信号であるため、
符号間干渉が生じる程度まで著しく到着時刻がずれてい
ない限り、一信号として正常に受信することができる。As described above, the radio communication system of this embodiment is a system for performing downlink subordinate synchronization, and the mobile relay station 101 performs transmission to the mobile station 105 in synchronization with the downlink signal from the base station 103. , The mobile station 105 is the base station 10
3 or determines the reception timing and the uplink transmission timing of its own station in synchronization with the downlink signal from the mobile relay station 101. In addition, in the branch relay operation (c) in the wireless communication system of this embodiment, the base station 103 and the mobile station 1
05 receives the respective radio signals from the mobile relay stations 101a and 101b substantially at the same time, but since the radio signals received by the base station 103 and the mobile station 105 have exactly the same contents,
Unless the arrival times are significantly shifted to the extent that intersymbol interference occurs, they can be normally received as one signal.
【００５０】以上説明したように、本実施形態の無線通
信システムでは、基地局１０３と移動局１０５との間に
複数の移動中継局が略並列に位置する状況において、基
地局１０３（移動局１０５）から送信された信号は各移
動中継局を介した複数の経路で移動局１０５（基地局１
０３）に送信されている。したがって、基地局１０３／
移動局１０５間の複数の通信経路に通信障害が生じたと
きでも、最低１つの通信経路が正常であれば基地局１０
３／移動局１０５間通信が可能となるため、移動中継局
の置局設計を綿密に行う必要がない。As described above, in the radio communication system of this embodiment, in the situation where a plurality of mobile relay stations are located substantially in parallel between the base station 103 and the mobile station 105, the base station 103 (mobile station 105 Signal transmitted from the mobile station 105 (base station 1) via a plurality of routes via each mobile relay station.
03). Therefore, the base station 103 /
Even if a communication failure occurs in a plurality of communication paths between the mobile stations 105, if at least one communication path is normal, the base station 10
Since 3 / mobile station 105 can communicate with each other, it is not necessary to carefully design the placement of the mobile relay station.
【００５１】また、各移動中継局から基地局１０３また
は移動局１０５に送信される信号は、同一の周波数かつ
同一のタイミングで移動局１０５または基地局１０３に
向けて送信される（複局同時送信）ため、符号間干渉が
生じる程度まで著しく到着時刻がずれない限り一信号と
して正常に受信することができる。なお、本実施形態の
分岐中継動作（ｃ）では、基地局１０３と移動局１０５
との間に設置された移動基地局が２局の場合について説
明したが、３局以上であっても良い。The signals transmitted from each mobile relay station to the base station 103 or the mobile station 105 are transmitted to the mobile station 105 or the base station 103 at the same frequency and at the same timing (simultaneous multi-station transmission). Therefore, the signals can be normally received as one signal unless the arrival times are significantly shifted to the extent that intersymbol interference occurs. In the branching relay operation (c) of this embodiment, the base station 103 and the mobile station 105 are
The case where the number of mobile base stations installed between and is two has been described, but the number of mobile base stations may be three or more.
【００５２】〔第２の実施形態〕図５は、第１の実施形
態の無線通信システムにおける通常動作（ａ）、中継動
作（ｂ）、多段中継動作（ｃ）および多段分岐中継動作
（ｄ）について説明する説明図である。中継動作
（ｂ）、多段中継動作（ｃ）および多段分岐中継動作
（ｄ）で用いられる移動中継局１０１ａ〜１０１ｄは第
１の実施形態の移動中継局１０１ａ，１０１ｂと同じで
あるため、説明を省略する。[Second Embodiment] FIG. 5 shows normal operation (a), relay operation (b), multistage relay operation (c) and multistage branch relay operation (d) in the wireless communication system of the first embodiment. It is an explanatory view explaining. The mobile relay stations 101a to 101d used in the relay operation (b), the multi-stage relay operation (c), and the multi-stage branch relay operation (d) are the same as the mobile relay stations 101a and 101b of the first embodiment, and therefore the description will be given. Omit it.
【００５３】以下、第２の実施形態の無線通信システム
について説明する。図５に示すように、本実施形態の無
線通信システムにおける基地局／移動局間の通信形態
は、通常動作（ａ）、中継動作（ｂ）、多段中継動作
（ｃ）および多段分岐中継動作（ｄ）の４通りがある。
同図において、図１（第１の実施形態）と重複する部分
には同一の符号を附し、通常動作（ａ）および中継動作
（ｂ）については第１の実施形態で説明したので説明を
省略する。なお、本実施形態の無線通信システムも、第
１の実施形態と同様に下り従属同期を行うシステムであ
る。The radio communication system of the second embodiment will be described below. As shown in FIG. 5, the communication modes between the base station and the mobile station in the wireless communication system of the present embodiment include normal operation (a), relay operation (b), multistage relay operation (c), and multistage branch relay operation ( There are 4 types of d).
In the figure, the same parts as those in FIG. 1 (first embodiment) are designated by the same reference numerals, and the normal operation (a) and the relay operation (b) have been described in the first embodiment. Omit it. The wireless communication system of the present embodiment is also a system that performs downlink subordinate synchronization as in the first embodiment.
【００５４】本実施形態の多段中継動作（ｃ）では、基
地局１０３と移動局１０５との間に２つの移動基地局１
０３ａ，１０１ｃが直列に設置されており、基地局１０
３／移動局１０５間の通信は移動中継局１０１ａおよび
移動中継局１０１ｃを介して行われる。本実施形態で
は、基地局１０３／移動中継局１０１ａ間は上りが周波
数Ｆ１、下りが周波数Ｆ２で伝送され、移動中継局１０
１ａ／移動中継局１０１ｃ間は上り下りとも周波数Ｆ３
（１）で伝送され、移動中継局１０１ｂ／移動局１０５
間は上り下りとも周波数Ｆ３（２）で伝送される。In the multistage relay operation (c) of this embodiment, two mobile base stations 1 are provided between the base station 103 and the mobile station 105.
03a and 101c are installed in series, and the base station 10
3 / The communication between the mobile stations 105 is performed via the mobile relay station 101a and the mobile relay station 101c. In the present embodiment, between the base station 103 and the mobile relay station 101a, the uplink is transmitted at the frequency F1 and the downlink is transmitted at the frequency F2.
Frequency F3 is used between 1a / mobile relay station 101c for both uplink and downlink.
The mobile relay station 101b / mobile station 105 transmitted in (1).
During this period, the data is transmitted at the frequency F3 (2) both in the up and down directions.
【００５５】本実施形態の多段中継動作（ｃ）では、図
６に示すように、４タイムスロット（スロットＡ〜Ｄ）
で基地局１０３／移動中継局１０１ａ／移動中継局１０
１ｃ／移動局１０５間の無線信号の伝送を行っており、
スロットによっては同時に２対向の通信を行っている。
但し、図６のスロットＡ，Ｃに示したように、信号を出
力する局は距離的に離れており、出力される信号の周波
数も異なるため、出力された信号同士が干渉することは
ほとんどない。In the multistage relay operation (c) of this embodiment, as shown in FIG. 6, four time slots (slots A to D) are used.
Base station 103 / mobile relay station 101a / mobile relay station 10
Radio signals are transmitted between 1c / mobile station 105,
Depending on the slot, two opposite communications are simultaneously performed.
However, as shown in slots A and C of FIG. 6, the stations that output signals are distant from each other in distance and the frequencies of the output signals are different, so that the output signals hardly interfere with each other. .
【００５６】次に、多段分岐中継動作（ｄ）では、基地
局１０３と移動局１０５との間に複数の移動中継局１０
１ａ〜１０１ｄが設置されており、基地局１０３／移動
局１０５間の通信は移動中継局１０１ａまたは１０１ｂ
と移動中継局１０１ｃまたは１０１ｄを介して行われ
る。したがって、図５（ｄ）に示す多段分岐中継動作で
は、上り下りともに基地局１０３／移動局間の通信経路
として以下の４経路（１）〜（４）が存在する。
（１）基地局１０３−移動中継局１０１ａ−移動中継局
１０１ｃ−移動局１０５
（２）基地局１０３−移動中継局１０１ａ−移動中継局
１０１ｄ−移動局１０５
（３）基地局１０３−移動中継局１０１ｂ−移動中継局
１０１ｃ−移動局１０５
（４）基地局１０３−移動中継局１０１ｂ−移動中継局
１０１ｄ−移動局１０５Next, in the multi-stage branch relay operation (d), a plurality of mobile relay stations 10 are provided between the base station 103 and the mobile station 105.
1a to 101d are installed, and communication between the base station 103 / mobile station 105 is performed by the mobile relay station 101a or 101b.
And the mobile relay station 101c or 101d. Therefore, in the multistage branch relay operation shown in FIG. 5D, the following four routes (1) to (4) exist as communication routes between the base station 103 and the mobile stations both in the up and down directions. (1) Base station 103-Mobile relay station 101a-Mobile relay station 101c-Mobile station 105 (2) Base station 103-Mobile relay station 101a-Mobile relay station 101d-Mobile station 105 (3) Base station 103-Mobile relay station 101b-mobile relay station 101c-mobile station 105 (4) base station 103-mobile relay station 101b-mobile relay station 101d-mobile station 105
【００５７】本実施形態では、基地局１０３／移動中継
局１０１ａまたは１０１ｂ間は上りが周波数Ｆ１、下り
が周波数Ｆ２で伝送され、移動中継局１０１ａまたは１
０１ｂ／移動中継局１０１ｃまたは１０１ｄ間は上り下
りとも周波数Ｆ３（１）で伝送され、移動中継局１０１
ｃまたは１０１ｄ／移動局１０５間は上り下りとも周波
数Ｆ３（２）で伝送される。In this embodiment, the uplink is transmitted at the frequency F1 and the downlink is transmitted at the frequency F2 between the base station 103 and the mobile relay station 101a or 101b.
01b / mobile relay station 101c or 101d is transmitted at the frequency F3 (1) in both the up and down directions.
Between c or 101d and the mobile station 105, the signal is transmitted at the frequency F3 (2) both in the up and down directions.
【００５８】特に、本実施形態の多段分岐中継動作
（ｄ）では、第１の実施形態の分岐中継動作と同様に、
基地局１０３から出力された下り信号は移動中継局１０
１ａ，１０１ｂの双方によって受信され、移動中継局１
０１ａ，１０１ｂの各局は受信データを同時に下り送信
する。また、移動中継局１０１ａ，１０１ｂから同時に
出力された下り信号は移動中継局１０１ｃ，１０１ｄの
双方によって受信され、移動中継局１０１ｃ，１０１ｄ
の各局は受信データを同時に下り送信する。In particular, in the multi-stage branch relay operation (d) of this embodiment, like the branch relay operation of the first embodiment,
The downlink signal output from the base station 103 is the mobile relay station 10
The mobile relay station 1 is received by both 1a and 101b.
The stations 01a and 101b simultaneously transmit the received data in the downlink. Further, the downlink signals simultaneously output from the mobile relay stations 101a and 101b are received by both the mobile relay stations 101c and 101d, and the mobile relay stations 101c and 101d are received.
Each station simultaneously transmits the received data in the downlink.
【００５９】また、移動局１０５から出力された上り信
号は、移動中継局１０１ｃ，１０１ｄの双方によって受
信され、移動中継局１０１ｃ，１０１ｄの各局は受信デ
ータを同時に上り送信する。また、移動中継局１０１
ｃ，１０１ｄから同時に出力された上り信号は移動中継
局１０１ａ，１０１ｂの双方によって受信され、移動中
継局１０１ａ，１０１ｂの各局は受信データを同時に上
り送信する。なお、移動中継局１０１ａ〜１０１ｄが行
う下り送信および上り送信のタイミングは、各移動中継
局が有する制御部２１１によって決定される。The uplink signal output from the mobile station 105 is received by both mobile relay stations 101c and 101d, and the mobile relay stations 101c and 101d simultaneously transmit the received data in uplink. In addition, the mobile relay station 101
The uplink signals simultaneously output from c and 101d are received by both mobile relay stations 101a and 101b, and the mobile relay stations 101a and 101b simultaneously transmit the received data in uplink. The timing of downlink transmission and uplink transmission performed by the mobile relay stations 101a to 101d is determined by the control unit 211 included in each mobile relay station.
【００６０】多段分岐中継動作（ｄ）の一例を図７に示
す。同図において、スロット０１では、基地局１０３が
周波数Ｆ２でデータを下り送信し、移動中継局１０１
ａ，１０１ｂの双方がこれを受信する。次に、スロット
０２では、移動中継局１０１ａ，１０１ｂはスロット０
１で受信した受信データを周波数Ｆ３（１）で同時に下
り送信し、移動中継局１０１ｃ，１０１ｄが略同時にこ
れを受信する。次に、スロット０３では、移動中継局１
０１ｃ，１０１ｄはスロット０２で受信した受信データ
を周波数Ｆ３（２）で同時に下り送信し、移動局１０５
が略同時にこれを受信する。FIG. 7 shows an example of the multi-stage branch relay operation (d). In the figure, in slot 01, the base station 103 transmits data at the frequency F2, and the mobile relay station 101
Both a and 101b receive this. Next, in slot 02, the mobile relay stations 101a and 101b are in slot 0
The received data received at 1 are simultaneously downlink-transmitted at the frequency F3 (1), and the mobile relay stations 101c and 101d receive them at substantially the same time. Next, in slot 03, the mobile relay station 1
01c and 101d simultaneously transmit the received data received in slot 02 on the frequency F3 (2), and the mobile station 105
Will receive this at about the same time.
【００６１】スロット０５では、移動局１０５が周波数
Ｆ３（２）でデータを上り送信し、移動中継局１０１
ｃ，１０１ｄの双方が略同時にこれを受信する。移動中
継局１０１ｃ，１０１ｄは受信したデータを一時蓄積し
た後、スロット０９で、蓄積していたデータを周波数Ｆ
３（１）で同時に上り送信し、移動中継局１０１ａ，１
０１ｂが略同時にこれを受信する。移動中継局１０１
ａ，１０１ｂは受信したデータを一時蓄積した後、スロ
ット１２で、蓄積していたデータを周波数Ｆ１で同時に
上り送信し、基地局１０３が略同時にこれを受信する。In the slot 05, the mobile station 105 transmits data at the frequency F3 (2) in the uplink, and the mobile relay station 101
Both c and 101d receive this substantially simultaneously. After the mobile relay stations 101c and 101d temporarily store the received data, the mobile relay stations 101c and 101d transmit the stored data to the frequency F in slot 09.
3 (1) simultaneously perform uplink transmission, and mobile relay stations 101a, 1a
01b receives this at substantially the same time. Mobile relay station 101
After temporarily storing the received data, a and 101b simultaneously perform uplink transmission of the stored data at the frequency F1 in the slot 12, and the base station 103 receives the data at substantially the same time.
【００６２】本実施形態の無線通信システムにおける多
段分岐中継動作（ｄ）では、基地局１０３および移動中
継局１０１ｃ，１０１ｄは移動中継局１０１ａ，１０１
ｂからの各無線信号を略同時に受信し、移動局１０５お
よび移動中継局１０１ａ，１０１ｂは移動中継局１０１
ｃ，１０１ｄからの各無線信号を略同時に受信するが、
基地局１０３や移動局１０５で受信された無線信号は全
く同じ内容の信号であるため、符号間干渉が生じる程度
まで著しく到着時刻がずれていない限り、一信号として
正常に受信することができる。In the multi-stage branch relay operation (d) in the wireless communication system of this embodiment, the base station 103 and mobile relay stations 101c and 101d are mobile relay stations 101a and 101d.
The mobile station 105 and the mobile relay stations 101a and 101b receive the radio signals from the mobile relay station 101 at substantially the same time.
Although the wireless signals from the c and 101d are received almost at the same time,
Since the radio signals received by the base station 103 and the mobile station 105 have exactly the same content, they can be normally received as one signal unless the arrival times are significantly shifted to the extent that intersymbol interference occurs.
【００６３】以上説明したように、本実施形態の無線通
信システムでは、基地局１０３と移動局１０５との間に
複数の移動中継局が網目状（直列および並列）に位置す
る状況において、基地局１０３（移動局１０５）から送
信された信号は、複数の移動中継局を介してそれぞれ異
なる複数の経路で移動局１０５（基地局１０３）に送信
されている。したがって、第１の実施形態と同様に、基
地局１０３／移動局１０５間の複数の通信経路に通信障
害が生じたときでも、最低１つの通信経路が正常であれ
ば基地局１０３／移動局１０５間の通信が可能となるた
め、移動中継局の置局設計を綿密に行う必要がない。As described above, in the radio communication system according to the present embodiment, in the situation where a plurality of mobile relay stations are located between the base station 103 and the mobile station 105 in a mesh shape (series and parallel), the base station The signal transmitted from 103 (mobile station 105) is transmitted to mobile station 105 (base station 103) via a plurality of different routes via a plurality of mobile relay stations. Therefore, similarly to the first embodiment, even when a communication failure occurs in a plurality of communication paths between the base station 103 / mobile station 105, if at least one communication path is normal, the base station 103 / mobile station 105 Since it is possible to communicate with each other, it is not necessary to carefully design the placement of the mobile relay station.
【００６４】また、複数の移動中継局を介した送受信が
可能なため、基地局１０３が実質的にカバーすることの
できる通信エリアを広げることができる。なお、本実施
形態の多段分岐中継動作（ｄ）では、基地局１０３の送
信信号を受信する移動中継局および移動局１０５に信号
を送信する移動中継局がそれぞれ２局の場合について説
明したが、３局以上であっても良い。Further, since transmission and reception can be performed via a plurality of mobile relay stations, it is possible to expand the communication area which the base station 103 can substantially cover. In the multi-stage branch relay operation (d) of the present embodiment, a case has been described in which the mobile relay station that receives the transmission signal of the base station 103 and the mobile relay station that transmits the signal to the mobile station 105 are each two stations. There may be three or more stations.
【００６５】〔第３の実施形態〕第１の実施形態で説明
した分岐中継動作や第２の実施形態で説明した多段分岐
中継動作を行う無線通信システムでは、途中で複数に分
かれた後合流するといった通信経路もあるため、経路長
の違いが原因して各信号の到着タイミングがずれると
「符号間干渉」と呼ばれる劣化を受け、信号波形に大幅
な歪みが発生する。この符号間干渉をなくすためには等
化器と呼ばれるフィルタが用いられ、特に、通信経路の
特性変化に追従する適応等化器やパスダイバーシチが用
いられる。なお、適応等化器の多くはＦＩＲ（Finite I
mpulse Response）型であり、適応アルゴリズムにはＬ
ＭＳアルゴリズムが用いられる場合が多い。[Third Embodiment] In a wireless communication system that performs the branch relay operation described in the first embodiment and the multi-stage branch relay operation described in the second embodiment, the wireless communication system divides into a plurality of parts and joins. Since there is also such a communication path, if the arrival timing of each signal is deviated due to the difference in the path length, it is deteriorated called "intersymbol interference" and a large distortion occurs in the signal waveform. In order to eliminate this intersymbol interference, a filter called an equalizer is used, and in particular, an adaptive equalizer or a path diversity that follows the characteristic change of the communication path is used. Most of the adaptive equalizers are FIR (Finite I
mpulse Response) type, and the adaptive algorithm is L
The MS algorithm is often used.
【００６６】本発明に係る無線通信システムでは、複数
の移動中継局が同じタイミングで信号を送信する複局同
時送信を行うため、複数の同じ送信波が異なる通信経路
で到達する可能性が高い。したがって、第３の実施形態
では、複数局からそれぞれ送信される信号同士の干渉を
最小限に抑えるための、特許請求の範囲の等化手段に該
当する等化部２５１を基地局１０３、移動中継局１０１
および移動局１０５に設ける。In the radio communication system according to the present invention, since a plurality of mobile relay stations perform multi-station simultaneous transmission in which signals are transmitted at the same timing, there is a high possibility that a plurality of same transmission waves will arrive on different communication routes. Therefore, in the third embodiment, the equalization unit 251 corresponding to the equalization means in the claims is provided for the base station 103 and the mobile relay in order to minimize the interference between signals transmitted from a plurality of stations. Station 101
And the mobile station 105.
【００６７】図８に、本実施形態の無線通信システムで
用いられる移動中継局の内部構成を示す。同図におい
て、本実施形態の移動中継局１０１′には、復調部２０
５と蓄積中継部２０７との間に等化部２５１が設けられ
ている。等化部２５１は、複数の局から送信され復調部
２０５で復調された信号同士の干渉を最小限に抑えるも
のであり、遅延等化手段やパスダイバーシチ手段によっ
て実現される。なお、本実施形態では、基地局１０３′
および移動局１０５′にも等化部２５１が設けられてい
るが、その構成は移動中継局１０１′と略同様であるた
め説明を省略する。FIG. 8 shows the internal structure of the mobile relay station used in the radio communication system of this embodiment. In the figure, the demodulation unit 20 is included in the mobile relay station 101 'of this embodiment.
An equalization unit 251 is provided between the storage unit 5 and the storage relay unit 207. The equalization unit 251 minimizes interference between signals transmitted from a plurality of stations and demodulated by the demodulation unit 205, and is realized by delay equalization means or path diversity means. In the present embodiment, the base station 103 '
The mobile station 105 'is also provided with an equalizer 251. However, the configuration thereof is substantially the same as that of the mobile relay station 101', and the description thereof will be omitted.
【００６８】以上説明したように、本実施形態では基地
局１０３′、移動中継局１０１′および移動局１０５′
が等化部２５１を備え、等化部２５１は複数局から送信
された各信号の干渉を最小限に抑えているため、良好な
回線品質を維持するための移動中継局の配置条件を緩和
することができる。したがって、移動中継局の置局設計
を綿密に行う必要がなくなる。なお、移動中継局１０
１′の等化部２５１において、信号同士の干渉を最小限
に抑えることができず正常なデータを得ることができな
かった場合、制御部２１１がその移動中継局の中継動作
を一時的に停止するか送信出力を小さくするよう指示す
ることによって、他局への伝送誤りの波及を最小限に抑
えることができる。As described above, in this embodiment, the base station 103 ', the mobile relay station 101' and the mobile station 105 'are used.
Includes an equalizer 251 and the equalizer 251 suppresses interference of signals transmitted from a plurality of stations to a minimum, so that the conditions for arranging mobile relay stations for maintaining good line quality are relaxed. be able to. Therefore, it is not necessary to carefully design the placement of the mobile relay station. The mobile relay station 10
In the 1'equalization unit 251, when the interference between signals cannot be minimized and normal data cannot be obtained, the control unit 211 temporarily stops the relay operation of the mobile relay station. Or by instructing to reduce the transmission output, it is possible to minimize the transmission error transmission to other stations.
【００６９】〔第４の実施形態〕第１の実施形態や第２
の実施形態の無線通信システムは、図２に示すように移
動中継局１０１ａ〜１０１ｄが蓄積中継部２０７を有
し、図４および図７に示すように、移動中継局１０１ａ
〜１０１ｄは受信データを蓄積中継部２０７で一時蓄積
した後、これを別のタイムスロットで送信している。第
４の実施形態では、受信データを他局に送信するまでの
間に時間があるため、データを蓄積中継部２０７に蓄積
する前にデータの誤り検出を行う、特許請求の範囲の誤
り検出手段に該当する誤り検出部２５３を移動中継局１
０１ａ〜１０１ｄに設ける。また、符号化およびフレー
ムの生成を行うフレーム生成部２５５を設ける。[Fourth Embodiment] First Embodiment and Second Embodiment
In the wireless communication system of the embodiment of the present invention, mobile relay stations 101a to 101d have storage relay section 207 as shown in FIG. 2, and mobile relay station 101a as shown in FIG. 4 and FIG.
101d temporarily stores the received data in the storage relay unit 207, and then transmits this in another time slot. In the fourth embodiment, since there is time until the received data is transmitted to another station, error detection of data is performed before the data is stored in the storage relay unit 207. The error detection unit 253 corresponding to the mobile relay station 1
01a to 101d. Further, a frame generation unit 255 that performs encoding and frame generation is provided.
【００７０】図９に、本実施形態の無線通信システムで
用いられる移動中継局の内部構成を示す。同図におい
て、本実施形態の移動中継局１０１″には、復調部２０
５と蓄積中継部２０７との間に誤り検出部２５３が設け
られ、蓄積中継部２０７と変調部２０９との間にフレー
ム生成部２５５が設けられている。まず、フレーム生成
部２５５は、ＣＲＣ（Cyclic redundancy check）やＢ
ＣＨ等の符号を生成し、これを蓄積中継部２０７から出
力されたデータに付加したフレームを生成するものであ
る。また、誤り検出部２５３は、受信データとしてのフ
レームに含まれているデータに対し、フレーム生成部２
５５で生成された符号を用いて誤り検出を行うものであ
り、データに誤りがある場合はそれを訂正しても良い。FIG. 9 shows the internal configuration of the mobile relay station used in the wireless communication system of this embodiment. In the figure, the demodulation unit 20 is provided in the mobile relay station 101 ″ of this embodiment.
5 and the storage relay unit 207 are provided with an error detection unit 253, and the storage relay unit 207 and the modulation unit 209 are provided with a frame generation unit 255. First, the frame generation unit 255 uses a CRC (Cyclic redundancy check) or B
A code such as CH is generated and added to the data output from the storage relay unit 207 to generate a frame. Further, the error detection unit 253 uses the frame generation unit 2 for the data included in the frame as the received data.
Error detection is performed using the code generated at 55. If the data has an error, it may be corrected.
【００７１】以上説明したように、本実施形態では移動
中継局１０１″が誤り検出部２５３を備え、フレーム生
成部２５５で生成された符号を用いて誤り検出を行って
いるため、中継時における回線品質の劣化を判定するこ
とができる。なお、誤り検出部２５３においてデータに
誤りが検出された場合、制御部２１１が当該移動中継局
の中継動作を一時的に停止するか送信出力を小さくする
よう指示することによって、他局への伝送誤りの波及を
最小限に抑えることができる。また、誤り検出部２５３
がデータ誤りを訂正するときも同様に、他局への伝送誤
りの波及を最小限に抑えることができる。結果として、
誤りを抑えた良好な伝送品質を得ることできる。As described above, in the present embodiment, the mobile relay station 101 ″ is provided with the error detection unit 253 and the code generated by the frame generation unit 255 is used for error detection. It is possible to determine the deterioration of the quality.If an error is detected in the data by the error detection unit 253, the control unit 211 may temporarily stop the relay operation of the mobile relay station or reduce the transmission output. By instructing, it is possible to minimize the spread of transmission error to other stations.
Similarly, when a data error is corrected by, the spread of transmission error to other stations can be minimized. as a result,
Good transmission quality with suppressed errors can be obtained.
【００７２】なお、本実施形態では、受信データを蓄積
中継部２０７に蓄積する前に誤り検出を行う構成とした
が、データの蓄積後に誤り検出する構成としても良い。
この場合、復調部２０５で復調されたデータは蓄積中継
部２０７にそのまま蓄積され、誤り検出部２５３は蓄積
されているデータに対して誤り検出を行う。In this embodiment, the error detection is performed before the received data is stored in the storage relay unit 207, but the error detection may be performed after the data is stored.
In this case, the data demodulated by the demodulation unit 205 is directly stored in the storage relay unit 207, and the error detection unit 253 performs error detection on the stored data.
【００７３】〔第５の実施形態〕第５の実施形態の無線
通信システムでは、移動中継局１０１が間欠的にビーコ
ン波を出力し、移動局１０５は中継要求信号を出力す
る。本実施形態において、移動中継局１０１が移動局１
０５から中継要求信号を受信するまでの間、移動中継局
１０１は、通信が行われていない空きタイムスロットの
タイミングで所定の周波数（周波数Ｆ３または別の周波
数）でビーコン波を出力する。[Fifth Embodiment] In the wireless communication system of the fifth embodiment, mobile relay station 101 intermittently outputs a beacon wave, and mobile station 105 outputs a relay request signal. In the present embodiment, the mobile relay station 101 is the mobile station 1
From 05 until receiving the relay request signal, the mobile relay station 101 outputs a beacon wave at a predetermined frequency (frequency F3 or another frequency) at the timing of an empty time slot in which communication is not performed.
【００７４】また、移動中継局１０１の通信エリア内に
在る移動局１０５が起動して所定の周波数で受信待ち受
けをし、移動中継局１０１からのビーコン波を受信する
と、移動局１０５は移動中継局１０１に対して中継要求
信号を送信する。移動中継局１０１がこの中継要求信号
を受信すると、移動中継局１０１は移動局１０５に対す
る中継局として中継動作を開始する。Further, when the mobile station 105 within the communication area of the mobile relay station 101 is activated to stand by for reception at a predetermined frequency and receives a beacon wave from the mobile relay station 101, the mobile station 105 performs mobile relay. The relay request signal is transmitted to the station 101. When mobile relay station 101 receives this relay request signal, mobile relay station 101 starts relay operation as a relay station for mobile station 105.
【００７５】本実施形態の無線通信システムでは、移動
局１０５から出力された中継要求信号を受信したときに
移動中継局１０１は中継動作を開始するため、中継する
対象となる移動局が通信エリア内にないときは無駄な中
継動作を行わない。したがって、移動中継局１０１は、
中継動作によって消費される電力エネルギーを節約する
ことができる。In the wireless communication system of this embodiment, the mobile relay station 101 starts the relay operation when it receives the relay request signal output from the mobile station 105, so that the mobile station to be relayed is within the communication area. If not, useless relay operation is not performed. Therefore, the mobile relay station 101
The power energy consumed by the relay operation can be saved.
【００７６】〔第６の実施形態〕第６の実施形態の無線
通信システムでは、移動局１０５が移動中継局１０１と
通信可能な状態において、移動局１０５／移動中継局１
０１間で通信が行われていない間、移動局１０５は周波
数Ｆ３で間欠的にビーコン波を出力する。一方、移動中
継局１０１はビーコン波を参照して移動局１０５と通信
可能か否かを判別し、移動局１０５からの上り信号やビ
ーコン波を一定期間受信できない場合は、移動局１０５
に対する中継動作を停止する。[Sixth Embodiment] In the wireless communication system of the sixth embodiment, mobile station 105 / mobile relay station 1 is in a state where mobile station 105 can communicate with mobile relay station 101.
While communication is not performed between 01, the mobile station 105 intermittently outputs a beacon wave at the frequency F3. On the other hand, the mobile relay station 101 refers to the beacon wave to determine whether or not it is possible to communicate with the mobile station 105. If the mobile relay station 101 cannot receive the uplink signal or the beacon wave from the mobile station 105 for a certain period, the mobile station 105
Stop the relay operation for.
【００７７】本実施形態の無線通信システムでは、移動
中継局１０１が移動局との通信状態を判別し、通信不可
能な場合はその移動局１０５に対する中継動作を停止し
て行わないため、中継動作によって消費される電力エネ
ルギーを節約することができる。In the wireless communication system of this embodiment, the mobile relay station 101 determines the communication state with the mobile station, and if communication is not possible, the relay operation for the mobile station 105 is stopped and is not performed. The power energy consumed by can be saved.
【００７８】〔第７の実施形態〕第７の実施形態の無線
通信システムでは、移動中継局１０１から送信される無
線信号またはビーコン波に中継段数を示す情報が含まれ
ている。また、多段分岐中継動作を行っている場合にお
いて、図１０に示すように新たな移動中継局１０１ｅが
追加または起動されたとき、移動中継局１０１ｅは、あ
るタイムスロットで周波数Ｆ３（１）で移動中継局１０
１ａから送信された信号および周波数Ｆ３（２）で移動
中継局１０１ｃから送信された信号を受信する。[Seventh Embodiment] In the wireless communication system of the seventh embodiment, the wireless signal or beacon wave transmitted from the mobile relay station 101 includes information indicating the number of relay stages. In addition, in the case where the multi-stage branch relay operation is performed, when a new mobile relay station 101e is added or activated as shown in FIG. 10, the mobile relay station 101e moves at a frequency F3 (1) in a certain time slot. Relay station 10
The signal transmitted from 1a and the signal transmitted from the mobile relay station 101c at the frequency F3 (2) are received.
【００７９】本実施形態の無線通信システムでは、移動
中継局１０１ａ〜１０１ｅから送信される無線信号また
はビーコン波に中継段数を示す情報が含まれているた
め、図１０に示した例では、移動中継局１０１ｅの制御
部２１１は受信した各無線信号に含まれる中継段数を比
較する。制御部２１１は、最も小さな中継段数の情報を
含む無線信号を送信した移動中継局１０１ａにとって、
自局（移動中継局１０１ｅ）が次段の移動中継局となる
よう送受信タイミングを決定し、決定された送受信タイ
ミングで送受信切替部２０３を制御する。また、移動中
継局１０１ｅは、上位の移動中継局から出力されたビー
コン波を受信したとき、そのビーコン波に含まれている
中継段数を示す情報を比較することによって自局の中継
段数を決定する。In the wireless communication system of this embodiment, since the wireless signals or beacon waves transmitted from the mobile relay stations 101a to 101e contain information indicating the number of relay stages, in the example shown in FIG. The control unit 211 of the station 101e compares the number of relay stages included in each received wireless signal. The control unit 211 controls the mobile relay station 101a that has transmitted the radio signal including the information on the smallest number of relay stages,
The transmission / reception timing is determined so that the own station (mobile relay station 101e) becomes the next-stage mobile relay station, and the transmission / reception switching unit 203 is controlled at the determined transmission / reception timing. Further, when the mobile relay station 101e receives the beacon wave output from the upper mobile relay station, the mobile relay station 101e determines the number of relay stages of its own station by comparing the information indicating the number of relay stages included in the beacon wave. .
【００８０】以上説明したように、本実施形態の無線通
信システムでは、移動中継局が新たに加わることによっ
て、移動中継局が中継段数の異なる各移動中継局からそ
れぞれ信号を受信したとき、当該移動中継局は、より低
い中継段数の無線信号を送信する移動中継局に対して移
動中継局間の従属関係が最適となるよう再設定してい
る。したがって、より遅延の少ない多段中継および中継
段数の差が小さい無線通信システムを実現することがで
きるため、移動中継局の配置条件を緩和することができ
る。したがって、移動中継局の置局設計を綿密に行う必
要がなくなる。As described above, in the wireless communication system of the present embodiment, when a mobile relay station newly receives a signal from each mobile relay station having a different number of relay stages, the mobile relay station receives the signal. The relay station is reset so that the subordination relationship between the mobile relay stations is optimal with respect to the mobile relay station that transmits a radio signal with a lower relay stage number. Therefore, since it is possible to realize a multi-stage relay with less delay and a wireless communication system with a small difference in the number of relay stages, it is possible to relax the arrangement conditions of the mobile relay station. Therefore, it is not necessary to carefully design the placement of the mobile relay station.
【００８１】[0081]
【発明の効果】以上説明したように、本発明の無線通信
システムおよび無線中継装置では、基地局と移動局との
間で時分割多元接続方式による無線通信を行い、基地局
と移動局との間に設けられた複数の中継局（無線中継装
置）が基地局若しくは移動局とまたは相互に通信可能で
あり、他局から同一の信号を受信した複数の中継局は、
それぞれ同一の周波数かつ同一のタイミングで信号を送
信している。As described above, in the wireless communication system and the wireless relay device of the present invention, the wireless communication is performed between the base station and the mobile station by the time division multiple access system, and the base station and the mobile station are connected. A plurality of relay stations (wireless relay devices) provided between can communicate with a base station or a mobile station or mutually, and a plurality of relay stations that have received the same signal from another station are
Signals are transmitted at the same frequency and the same timing.
【００８２】このように、基地局（移動局）から送信さ
れた信号は中継局（無線中継装置）を介した複数の経路
で移動局（基地局）に送信されるため、基地局／移動局
間の複数の通信経路に通信障害が生じたときでも、最低
１つの通信経路が正常であれば基地局／移動局間の通信
が可能となる。したがって、中継局の置局設計を綿密に
行う必要がなくなる。また、複数の中継局のそれぞれ
は、同一の周波数かつ同一のタイミングで信号を送信し
ているため、該信号を受信する他局は、符号間干渉が生
じる程度まで著しく到着時刻がずれない限り一信号とし
て正常に受信することができる。As described above, since the signal transmitted from the base station (mobile station) is transmitted to the mobile station (base station) through a plurality of routes via the relay station (radio relay apparatus), the base station / mobile station Even if a communication failure occurs in a plurality of communication paths between them, if at least one communication path is normal, communication between the base station and the mobile station becomes possible. Therefore, it is not necessary to carefully design the placement of the relay station. Also, since each of the plurality of relay stations transmits a signal at the same frequency and at the same timing, other stations that receive the signal have the same arrival time unless the arrival times are significantly shifted to the extent that intersymbol interference occurs. It can be received normally as a signal.
【００８３】また、複数の中継局（無線中継装置）が基
地局と移動局との間に多段に設けられ、同一の段数に位
置する中継局が複数在り、同一の段数に位置する複数の
中継局が、基地局若しくは移動局または異なる段数に位
置する他の中継局から同一の信号を受信したとき、同一
の段数に位置する複数の中継局はそれぞれ同一の周波数
かつ同一のタイミングで信号を送信している。Further, a plurality of relay stations (wireless relay devices) are provided in multiple stages between the base station and the mobile station, there are a plurality of relay stations located at the same stage number, and a plurality of relay stations located at the same stage number. When a station receives the same signal from a base station, mobile station, or another relay station located in a different number of stages, multiple relay stations located in the same number of stages transmit signals at the same frequency and at the same timing. is doing.
【００８４】このように、基地局（移動局）から送信さ
れた信号は複数の中継局（無線中継装置）を介した送受
信が可能なため、基地局が実質的にカバーすることので
きる通信エリアを広げることができる。また、同一の段
数に位置する複数の中継局はそれぞれ同一の周波数かつ
同一のタイミングで信号を送信しているため、該信号を
受信する他局は、符号間干渉が生じる程度まで著しく到
着時刻がずれない限り一信号として正常に受信すること
ができる。As described above, since the signal transmitted from the base station (mobile station) can be transmitted and received through a plurality of relay stations (wireless relay devices), the communication area which can be substantially covered by the base station. Can be extended. In addition, since a plurality of relay stations located at the same number of stages transmit signals at the same frequency and at the same timing, other stations receiving the signals have a significant arrival time to the extent that intersymbol interference occurs. As long as there is no deviation, it can be normally received as one signal.
【図１】第１の実施形態の無線通信システムにおける通
常動作（ａ）、中継動作（ｂ）および分岐中継動作
（ｃ）について説明する説明図である。FIG. 1 is an explanatory diagram illustrating a normal operation (a), a relay operation (b), and a branch relay operation (c) in a wireless communication system according to a first embodiment.
【図２】第１の実施形態の無線通信システムで用いられ
る移動中継局を示すブロック構成図である。FIG. 2 is a block configuration diagram showing a mobile relay station used in the wireless communication system of the first embodiment.
【図３】第１の実施形態の無線通信システムにおける中
継動作時のタイムスロット毎の動作を説明する説明図で
ある。FIG. 3 is an explanatory diagram illustrating an operation for each time slot during a relay operation in the wireless communication system according to the first embodiment.
【図４】第１の実施形態の無線通信システムが行う分岐
中継動作の一例を示す説明図である。FIG. 4 is an explanatory diagram illustrating an example of a branch relay operation performed by the wireless communication system according to the first embodiment.
【図５】第２の実施形態の無線通信システムにおける通
常動作（ａ）、中継動作（ｂ）、多段中継動作（ｃ）お
よび多段分岐中継動作（ｄ）について説明する説明図で
ある。FIG. 5 is an explanatory diagram illustrating a normal operation (a), a relay operation (b), a multistage relay operation (c), and a multistage branch relay operation (d) in the wireless communication system of the second embodiment.
【図６】第２の実施形態の無線通信システムにおける多
段中継動作時のタイムスロット毎の動作を説明する説明
図である。FIG. 6 is an explanatory diagram illustrating an operation for each time slot during a multi-stage relay operation in the wireless communication system according to the second embodiment.
【図７】第２の実施形態の無線通信システムが行う多段
分岐中継動作の一例を示す説明図である。FIG. 7 is an explanatory diagram showing an example of a multi-stage branch relay operation performed by the wireless communication system according to the second embodiment.
【図８】第３の実施形態の無線通信システムで用いられ
る移動中継局を示すブロック構成図である。FIG. 8 is a block configuration diagram showing a mobile relay station used in the wireless communication system of the third embodiment.
【図９】第４の実施形態の無線通信システムで用いられ
る移動中継局を示すブロック構成図である。FIG. 9 is a block configuration diagram showing a mobile relay station used in the wireless communication system of the fourth embodiment.
【図１０】第７の実施形態の無線通信システムにおける
多段分岐中継動作について説明する説明図である。FIG. 10 is an explanatory diagram illustrating a multistage branch relay operation in the wireless communication system according to the seventh embodiment.
１０１，１０１ａ〜１０１ｅ，１０１′，１０１″ 移
動中継局
１０３ 基地局
１０５ 移動局
２０１ アンテナ
２０３ 送受信切替部
２０５ 復調部
２０７ 蓄積中継部
２０９ 変調部
２１１ 制御部
２５１ 等化部
２５３ 誤り検出部
２５５ フレーム生成部101, 101a to 101e, 101 ', 101 "mobile relay station 103 base station 105 mobile station 201 antenna 203 transmission / reception switching unit 205 demodulation unit 207 accumulation relay unit 209 modulation unit 211 control unit 251 equalization unit 253 error detection unit 255 frame generation Department
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−305629（ＪＰ，Ａ) 特開 平８−195710（ＪＰ，Ａ) 特開 平９−238100（ＪＰ，Ａ) 特開2000−165307（ＪＰ，Ａ) 特開 平９−64798（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/24 - 7/26 H04B 7/14 - 7/22 H04Q 7/00 - 7/38 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-305629 (JP, A) JP-A-8-195710 (JP, A) JP-A-9-238100 (JP, A) JP-A-2000-165307 (JP, A) JP 9-64798 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H04B 7/ 24-7/26 H04B 7/14-7/22 H04Q 7 / 00-7/38
Claims (2)
方式による無線通信を行う無線通信システムであって、 前記基地局と前記移動局との間に、前記基地局若しくは
前記移動局とまたは相互に通信可能な複数の中継局を備
え、前記基地局と前記中継局との間の通信は上り周波数と下
り周波数がそれぞれ異なり、前記中継局と前記移動局と
の間の通信は上り周波数と下り周波数が同じであり、 前記中継局は、前記基地局からの下り信号に同期して前
記移動局への送信を行い、前記移動局は、前記基地局ま
たは前記中継局からの下り信号に同期して自局の受信タ
イミングおよび上り送信タイミングを決定する ことを特
徴とする無線通信システム。1. A wireless communication system for performing wireless communication by a time division multiple access method between a base station and a mobile station, wherein the base station or the mobile station is provided between the base station and the mobile station. Or a plurality of relay stations that can communicate with each other, and communication between the base station and the relay station
Frequency is different, and the relay station and the mobile station
The uplink frequency and the downlink frequency are the same in the communication between the relay stations , and the relay station synchronizes with the downlink signal from the base station.
The mobile station transmits to the mobile station, and the mobile station transmits to the base station.
Alternatively, the receiving station of its own station is synchronized with the downlink signal from the relay station.
A wireless communication system characterized by determining the timing of imming and upstream transmission .
方式による無線通信を行う無線通信システムであって、 前記基地局と前記移動局との間に、前記基地局若しくは
前記移動局とまたは相互に通信可能な複数の中継局を備
え、 前記複数の中継局が前記基地局と前記移動局との間に多
段に設けられ、同一の段に位置する中継局が複数在り、前記基地局と通信可能な同一の段に位置する各中継局と
前記基地局との間の通信は上り周波数と下り周波数がそ
れぞれ異なり、前記基地局と通信可能な同一の段に位置
する各中継局と前記移動局と通信可能な同一の段に位置
する各中継局との間の通信は上り周波数と下り周波数が
同じであり、前記移動局と通信可能な同一の段に位置す
る各中継局と前記移動局との間の通信は上り周波数と下
り周波数が同じであり、 前記移動局と通信可能な同一の段に位置する各中継局
は、前記基地局と通信可能な同一の段に位置する各中継
局が受信した前記基地局からの下り信号に同期して前記
移動局への送信を行い、前記移動局は、前記基地局また
は前記移動局と通信可能な同一の段に位置する各中継局
からの下り信号に同期して自局の受信タイミングおよび
上り送信タイミングを決定する ことを特徴とする無線通
信システム。2. A time division multiple access between a base station and a mobile station.
A wireless communication system for performing wireless communication according to a method , wherein the base station or the mobile station is provided between the base station and the mobile station.
Equipped with multiple relay stations that can communicate with the mobile station or with each other
The plurality of relay stations are provided in multiple stages between the base station and the mobile station, there are a plurality of relay stations located in the same stage, and each is located in the same stage capable of communicating with the base station. With relay station
Communication with the base station has both upstream and downstream frequencies.
Different from each other, located on the same stage where communication with the base station is possible
Located in the same stage where each relay station can communicate with the mobile station
Communication between each relay station
They are the same and are located in the same stage where they can communicate with the mobile station.
Communication between each relay station and the mobile station
Relay stations that have the same frequency and are located in the same stage that can communicate with the mobile station
Are relays located in the same stage that can communicate with the base station.
In synchronization with the downlink signal from the base station received by the station,
Transmitting to a mobile station, the mobile station
Is each relay station located in the same stage that can communicate with the mobile station
In synchronization with the downlink signal from the
Radio communications system that is characterized in that to determine the uplink transmission timing.
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| JP2000365137A JP3460695B2 (en) | 2000-11-30 | 2000-11-30 | Wireless communication system and wireless relay device |
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| JP3460695B2 true JP3460695B2 (en) | 2003-10-27 |
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| US7006461B2 (en) | 2001-09-17 | 2006-02-28 | Science Applications International Corporation | Method and system for a channel selective repeater with capacity enhancement in a spread-spectrum wireless network |
| EP1700404B8 (en) | 2003-12-30 | 2009-12-02 | Nokia Corporation | Communication system using relay base stations with asymmetric data links |
| JP4170237B2 (en) * | 2004-02-10 | 2008-10-22 | 双葉電子工業株式会社 | Wireless system |
| CN101036319B (en) * | 2004-10-20 | 2012-05-09 | 松下电器产业株式会社 | Booster |
| JP2006319590A (en) * | 2005-05-12 | 2006-11-24 | Nec Engineering Ltd | Watch system for local area |
| JP4805751B2 (en) * | 2006-08-18 | 2011-11-02 | 富士通株式会社 | Wireless communication apparatus and wireless communication method |
| JP4981580B2 (en) | 2007-08-22 | 2012-07-25 | キヤノン株式会社 | RELAY SYSTEM, ITS CONTROL METHOD, AND COMMUNICATION DEVICE |
| JP5413150B2 (en) * | 2009-11-25 | 2014-02-12 | 日本電気株式会社 | Transmission timing adjusting device and method, and relay device using the same |
| KR101665568B1 (en) | 2010-12-08 | 2016-10-12 | 삼성전자주식회사 | Method and apparatus for distributed transmission power control in wireless networks |
| US10355771B1 (en) | 2017-05-22 | 2019-07-16 | Resonant Sciences, LLC | RF repeater and mobile unit with cancellation of interference from a repeated signal |
| JP2020096237A (en) * | 2018-12-10 | 2020-06-18 | パナソニックＩｐマネジメント株式会社 | Base unit and repeater |
| JP2020096236A (en) * | 2018-12-10 | 2020-06-18 | パナソニックＩｐマネジメント株式会社 | Base unit and repeater |
| JP2023118510A (en) | 2022-02-15 | 2023-08-25 | オムロン株式会社 | Traveling device |
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