JP2001204073A - Wireless data communication system - Google Patents
Wireless data communication systemInfo
- Publication number
- JP2001204073A JP2001204073A JP2000009467A JP2000009467A JP2001204073A JP 2001204073 A JP2001204073 A JP 2001204073A JP 2000009467 A JP2000009467 A JP 2000009467A JP 2000009467 A JP2000009467 A JP 2000009467A JP 2001204073 A JP2001204073 A JP 2001204073A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- data
- transmission
- station
- dox
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、複数の移動局で
共用する通信回線を介して基地局との伝送路を確立して
データを伝送する無線データ通信システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio data communication system for transmitting data by establishing a transmission path with a base station via a communication line shared by a plurality of mobile stations.
【０００２】[0002]
【従来の技術】ここ数年、移動通信環境においてデータ
通信を行う、いわゆるモバイルコンピューティングのニ
ーズが高まっている。特にＰＤＣ−Ｐシステム（ＡＲＩ
Ｂ ＳＴＤ−２７Ｆ版以降）で規定されるデジタル自動
車電話システムにおけるパケット通信システムのよう
な、同一キャリアにて制御信号とユーザデータの送受信
データ通信を行う方法も採択されている。2. Description of the Related Art In recent years, there has been an increasing need for so-called mobile computing for performing data communication in a mobile communication environment. Especially PDC-P system (ARI
A method of performing transmission / reception data communication of a control signal and user data on the same carrier, such as a packet communication system in a digital automobile telephone system specified by BSTD-27F or later), has also been adopted.
【０００３】この様な通信システムでは移動局と基地局
との間で同期をとるために、基地局側で送信すべき有為
なデータがないタイミングでも、基地局側で自律的に擬
似送信データを作成し、アイドルデータとして送信し、
移動局に受信させている。これにより一定時間データの
やりとりが行われない場合でも基地局から常に出力があ
るために同期の確保が可能となっている。In such a communication system, in order to synchronize between the mobile station and the base station, even if there is no significant data to be transmitted on the base station side, the base station side autonomously transmits the pseudo transmission data. And send it as idle data,
It is being received by the mobile station. As a result, even when data is not exchanged for a certain period of time, synchronization is ensured because there is always output from the base station.
【０００４】[0004]
【発明が解決しようとする課題】しかし、周波数を再利
用する無線システムでは、基地局からの出力が他セルま
で伝播し、干渉波となって当該伝送路の障害ともなり得
るため、アイドルデータ送信による必要以上の出力は本
来望ましくない。However, in a radio system that reuses frequency, the output from the base station propagates to other cells and becomes an interference wave, which may obstruct the transmission path. Output more than necessary due to
【０００５】また、この同期確立手段を用いたシステム
では、そのキャリアを中継増幅するブースターや衛星な
どを用いたシステムでも、中継器に前記アイドルデータ
が入力されることになり、電力の確保が困難な中継増幅
装置には、それらの入力による出力電力の確保が大きな
負担となるという問題がある。Further, in a system using this synchronization establishing means, even in a system using a booster or a satellite which relays and amplifies the carrier, the idle data is input to the repeater, making it difficult to secure power. Such a relay amplifying device has a problem that securing the output power by those inputs becomes a heavy burden.
【０００６】この発明の目的は、以上のような問題を解
消し、他セルへの干渉を抑制し、また、中継増幅器を用
いたシステムでの中継器消費電力の負担を軽減すべく、
基地局と移動局との間で無線データ通信を行う際に、前
記移動局に対する送信データの有無を随時検出し、当該
検出結果に基づいて、送信データが発生していない場合
は前記基地局からの前記移動局に対する送信出力を停止
し、送信データが発生した場合には、前記基地局からの
前記移動局に対する送信出力を再開する送信データ制御
（以下、ＤＯＸ（Ｄａｔａ Ｏｐｅｒａｔｅｄ Ｔｒａ
ｎｓｍｉｓｓｉｏｎ）制御ともいう）を行った場合に、
基地局および移動局間の同期が不安定となることを解決
し、効率的な運用を行うことができる無線データ通信シ
ステムを提案することにある。An object of the present invention is to solve the above problems, suppress interference with other cells, and reduce the burden of repeater power consumption in a system using a repeater amplifier.
When performing wireless data communication between the base station and the mobile station, the presence or absence of transmission data for the mobile station is detected as needed, and based on the detection result, if no transmission data is generated, the base station transmits Transmission data control (hereinafter referred to as DOX (Data Operated Tra), which stops transmission output to the mobile station and restarts transmission output from the base station to the mobile station when transmission data is generated.
nsmission) control).
An object of the present invention is to solve the problem of unstable synchronization between a base station and a mobile station and to propose a wireless data communication system capable of performing efficient operation.
【０００７】[0007]
【課題を解決するための手段】上述した課題を解決する
ために、請求項１の発明は、基地局と移動局との間で無
線データ通信を行う際に、前記移動局に対する送信デー
タの有無を随時検出し、当該検出結果に基づいて、送信
データが発生していない場合は前記基地局からの前記移
動局に対する送信出力を停止し、送信データが発生した
場合には、前記基地局からの前記移動局に対する送信出
力を再開する送信データ制御を行う無線データ通信シス
テムにおいて、前記送信データ制御により前記基地局が
前記移動局に対する送信出力を停止している期間中に、
アイドルデータを所定のタイミングで前記基地局から出
力することを特徴とする。According to a first aspect of the present invention, there is provided a wireless communication system comprising: a base station and a mobile station, which perform wireless data communication between a base station and a mobile station; At any time, based on the detection result, when transmission data has not been generated, the transmission output from the base station to the mobile station is stopped, and when transmission data has been generated, In a wireless data communication system that performs transmission data control to restart transmission output to the mobile station, during the period when the base station has stopped transmission output to the mobile station by the transmission data control,
The idle data is output from the base station at a predetermined timing.
【０００８】また、請求項２の発明は、請求項１におい
て、前記送信データ制御に際して上位局が前記基地局を
制御することを特徴とする。[0008] The invention according to claim 2 is characterized in that, in claim 1, an upper station controls the base station when the transmission data is controlled.
【０００９】さらに請求項３の発明は、請求項１または
２において、前記上位局または前記基地局は、前記送信
データ制御を停止又は再開させる機能を有することを特
徴とする。Further, the invention of claim 3 is characterized in that, in claim 1 or 2, the upper station or the base station has a function of stopping or restarting the transmission data control.
【００１０】[0010]
【発明の実施の形態】以下、図面を参照して、この発明
の第一の実施形態について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
【００１１】（システム全体の構成）図１に無線データ
通信システムの全体構成を示す。同図において、１−
１，１−２，１−３，１−４（以下、特定しない場合は
単に“１”と記す場合もある）は当該セル配下にある複
数の移動局であり、２−１，２−２（以下、特定しない
場合は単に“２”と記す場合もある）の基地局との間で
５−１，５−２（特定しない場合は単に“５”と記す場
合もある）の通信回線を用いて伝送路を確立する。ま
た、３は前記基地局２の上位に位置し、当該基地局２を
制御する制御局である。４は基地局２の上位に位置す
る、データ通信網である。(Overall Configuration of System) FIG. 1 shows the overall configuration of a wireless data communication system. In FIG.
1, 1-2, 1-3, 1-4 (hereinafter sometimes simply referred to as "1" if not specified) are a plurality of mobile stations under the cell, and 2-1 and 2-2. A communication line of 5-1 and 5-2 (hereinafter sometimes simply written as "5" when not specified) is connected to a base station (hereinafter sometimes simply written as "2" when not specified). To establish a transmission path. Reference numeral 3 denotes a control station located above the base station 2 and controlling the base station 2. Reference numeral 4 denotes a data communication network located above the base station 2.
【００１２】（基地局の構成）基地局の構成について説
明する。図２に基地局の機能構成を示す。同図におい
て、６は通信回線５を介して伝送されるデータを送受信
するアンテナであり，７はアンテナ６を介して送受信さ
れるデータ信号を整形するＲＦ（Ｒａｄｉｏ Ｆｒｅｑ
ｕｅｎｃｙ）装置である。８はＲＦ装置７に後述する図
３に例示するようなデータを送る送信機であり、９はＲ
Ｆ装置７を通じて移動局よりデータを受信する受信機で
ある。送信機８は、後述するようなＤＯＸ制御を実行す
る制御手段を有する。１０は必要に応じてＤＯＸ制御を
管理して、送信機８に指示をするＤＯＸ制御部である。
基地局は送受信データを一時的に格納するバッファ１
１、インタフェース１２を介して上位制御局、データ通
信網とデータの入出力を行う。(Configuration of Base Station) The configuration of the base station will be described. FIG. 2 shows a functional configuration of the base station. In the figure, reference numeral 6 denotes an antenna for transmitting and receiving data transmitted via the communication line 5, and reference numeral 7 denotes an RF (Radio Freq) for shaping a data signal transmitted and received via the antenna 6.
uency) device. Reference numeral 8 denotes a transmitter for transmitting data as illustrated in FIG.
It is a receiver that receives data from the mobile station through the F device 7. The transmitter 8 has control means for executing DOX control as described later. Reference numeral 10 denotes a DOX control unit that manages DOX control as needed and instructs the transmitter 8.
The base station has a buffer 1 for temporarily storing transmission / reception data.
1. Input and output of data with the upper control station and the data communication network via the interface 12.
【００１３】（システムの動作）次に上述の構成の動作
について説明する。移動局１宛てのデータはデータ通信
網４から、制御局３を介し、または直接基地局２に入力
され、基地局２は通信回線５を介して移動局１にデータ
を送信する。(Operation of System) Next, the operation of the above configuration will be described. The data addressed to the mobile station 1 is input from the data communication network 4 via the control station 3 or directly to the base station 2, and the base station 2 transmits the data to the mobile station 1 via the communication line 5.
【００１４】図３に基地局から移動局へ送信する下り無
線回線の信号のフォーマット、図４に送信機（ＴＸ）８
において処理する信号の例を説明する図である。図４の
（Ａ）はデータの流れを示し、（Ｂ）はＤＯＸ制御中を
示し、（Ｃ）はＤＯＸ制御停止中を示す。基地局ＴＸＯ
Ｎは送信機８の送信出力中を示し、基地局ＴＸＯＦＦは
送信機８の送信出力停止中を示す。１３は送信信号に周
期的に設けられたフレームカウンタであり、１４は送信
機８においてフレーム周期で挿入されるＤＯＸフラグ
（説明は後述する）である。１５は送信すべきデータで
ある。次タイミングにて送信するデータがある場合、送
信機８は本ＤＯＸフラグを０ＦＦする。次タイミングに
て送信するデータがない場合、送信機８は本ＤＯＸフラ
グを０Ｎする。FIG. 3 shows a format of a signal of a downlink radio channel transmitted from a base station to a mobile station, and FIG. 4 shows a transmitter (TX) 8.
FIG. 3 is a diagram for explaining an example of a signal processed in FIG. 4A shows the flow of data, FIG. 4B shows the state during DOX control, and FIG. 4C shows the state during DOX control suspension. Base station TXO
N indicates that the transmission output of the transmitter 8 is being performed, and the base station TXOFF indicates that the transmission output of the transmitter 8 is being stopped. Reference numeral 13 denotes a frame counter provided periodically in the transmission signal, and reference numeral 14 denotes a DOX flag (described later) inserted in the transmitter 8 at a frame period. Reference numeral 15 denotes data to be transmitted. If there is data to be transmitted at the next timing, the transmitter 8 sets this DOX flag to 0FF. If there is no data to be transmitted at the next timing, the transmitter 8 sets this DOX flag to 0N.
【００１５】基地局内部のＤＯＸ制御中の動作として
は、インタフェース１２に上位制御局、データ通信網よ
りデータ１５が入力されると、それを一旦バッファ１１
に格納する。送信機８はバッファ１１内の送信データの
有無を検出し、バッファ１１内に送信データが複数格納
されていれば、ＲＦ装置７に随時データを出力する。送
信機８は、バッファ１１に格納されている送信データが
１つしかない場合は、本データ以降基地局は出力停止を
行うという旨を通知する働きを持つＤＯＸフラグ１４を
０Ｎさせてその送信データと共にＲＦ装置７に出力す
る。送信機８は、バッファ１１に送信データが格納され
ていない場合は、ＲＦ装置７への送信出力を停止する。
インタフェース１２を介してバッファ１１に再び上位か
らデータが入力された場合は、送信機８は自ら出力再開
通知用データ１６を生成し、ＲＦ装置７に出力し、続い
てＤＯＸフラグを０ＦＦし、データを送信する。以上の
動作は図４の（Ｂ）に示す通りである。The operation during DOX control inside the base station is as follows. When data 15 is input to the interface 12 from the host control station or the data communication network, it is temporarily transferred to the buffer 11.
To be stored. The transmitter 8 detects the presence or absence of transmission data in the buffer 11, and outputs the data to the RF device 7 at any time if a plurality of transmission data are stored in the buffer 11. When there is only one piece of transmission data stored in the buffer 11, the transmitter 8 sets the DOX flag 14 having a function of notifying that the base station stops outputting the data after this data to 0N, and sets the transmission data to that value. Is output to the RF device 7. When the transmission data is not stored in the buffer 11, the transmitter 8 stops the transmission output to the RF device 7.
When data is input from the upper level to the buffer 11 again via the interface 12, the transmitter 8 generates the output restart notification data 16 by itself and outputs it to the RF device 7, and subsequently sets the DOX flag to 0FF, and outputs the data. Send The above operation is as shown in FIG.
【００１６】ＤＯＸ制御停止中の送信機８からは図４の
（Ｃ）のような信号が出力される。すなわち、送信機８
は、送信出力を継続し（ＴＸＯＮ）、バッファ１１に送
信データが無い場合は、アイドルデータ１７を送信す
る。While the DOX control is stopped, the transmitter 8 outputs a signal as shown in FIG. That is, the transmitter 8
Continues transmission output (TXON), and transmits idle data 17 when there is no transmission data in the buffer 11.
【００１７】移動局内部の動作としては、連続して受信
データがある場合は受信を続け、ＤＯＸフラグ１４の０
Ｎを検出した場合は、該当キャリアの監視は続けるもの
の受信電力が無くなることを認識する。この監視期間に
出力再開通知用データ１６を受信した場合は、本データ
を用いて移動局、基地局間の同期を調整し、次のタイミ
ングから受信データが存在することを認識する。As an operation inside the mobile station, if there is continuous reception data, reception is continued, and the DOX flag 14 is set to 0.
When N is detected, the monitoring of the corresponding carrier is continued, but it is recognized that the reception power is lost. When the output restart notification data 16 is received during this monitoring period, the synchronization between the mobile station and the base station is adjusted using this data, and the presence of the received data is recognized from the next timing.
【００１８】上記基地局からの出力停止が長期間続くと
出力再開通知用データ１６だけでは、移動局と基地局間
の同期調整が困難な場合を想定する。この場合は図５の
（Ａ）に示すようにアイドルデータ１７を送信機８で自
ら生成し、それを決められたタイミングで（出力再開通
知用データ１６、フレームカウンタ１３、ＤＯＸフラグ
１４ＯＮに続けて）出力する。それを移動局側で受信す
ることにより、２局問の同期を調整することが可能にな
る。If the output suspension from the base station continues for a long time, it is assumed that it is difficult to adjust the synchronization between the mobile station and the base station using only the output restart notification data 16. In this case, as shown in FIG. 5 (A), the transmitter 8 generates the idle data 17 by itself and, at a predetermined timing, (the output restart notification data 16, the frame counter 13, and the DOX flag 14ON are successively turned on). )Output. By receiving it on the mobile station side, it is possible to adjust synchronization between two stations.
【００１９】図５の（Ｂ）はＤＯＸ制御停止中の送信機
８からの信号の出力例を示す。FIG. 5B shows an example of output of a signal from the transmitter 8 while the DOX control is stopped.
【００２０】以上のＤＯＸ機能を備えた基地局２の動作
を、制御局３の指示よって、制御することもできる。こ
の場合の、ＤＯＸ制御開始時の基地局の動作を図６に示
し、ＤＯＸ制御停止時の基地局の動作を図７に示す。The operation of the base station 2 having the above-described DOX function can be controlled by the instruction of the control station 3. FIG. 6 shows the operation of the base station when DOX control is started in this case, and FIG. 7 shows the operation of the base station when DOX control is stopped.
【００２１】図６に示すように、ＤＯＸ制御開始時にお
いては、制御局３は、制御信号を用いてインタフェース
１２を介してＤＯＸ制御部１０にＤＯＸ制御開始を通知
する。ＤＯＸ制御部１０はそれを送信機８に通知し、送
信機８はＤＯＸ制御を開始する。周辺セルへの干渉が多
いと見込まれる特定の基地局に対して、制御局３が本制
御を行うことにより、周辺セルへの干渉を防げることが
可能である。また、無線回線を中継する中継機の電力確
保が厳しいと判断された時間帯に、本制御を基地局２と
制御局３の間で行うことにより、中継機の消費電力の低
減が可能になる。As shown in FIG. 6, at the start of DOX control, the control station 3 notifies the DOX control unit 10 of the start of DOX control via the interface 12 using a control signal. The DOX control unit 10 notifies the transmitter 8 of the notification, and the transmitter 8 starts DOX control. The control station 3 performs this control for a specific base station that is expected to have a large amount of interference with neighboring cells, thereby preventing interference with neighboring cells. Also, by performing this control between the base station 2 and the control station 3 during a time period in which it is determined that securing power of the repeater that relays the wireless line is severe, the power consumption of the repeater can be reduced. .
【００２２】図７に示すように、ＤＯＸ制御停止時にお
いては、制御局３は、制御信号を用いてインタフェース
１２を介してＤＯＸ制御部１０にＤＯＸ制御停止を通知
する。ＤＯＸ制御部１０はそれを送信機８に通知し、送
信機８はＤＯＸ制御停止を行う。本制御を制御局３が転
入先基地局に行うことにより、基地局は常時何かしらの
データを出力するため、移動機、基地局間の同期確保に
かかる時間を縮小可能である。周辺セルから、特定の時
間帯に多数の移動機が転入してくると見込まれている際
に本制御は有効である。As shown in FIG. 7, when the DOX control is stopped, the control station 3 notifies the DOX control unit 10 via the interface 12 of the DOX control stop using the control signal. The DOX control unit 10 notifies the transmitter 8 of the notification, and the transmitter 8 stops the DOX control. By performing this control by the control station 3 to the transfer destination base station, the base station always outputs some data, so that the time required for securing synchronization between the mobile station and the base station can be reduced. This control is effective when it is expected that a large number of mobile units will move in from a peripheral cell in a specific time zone.
【００２３】[0023]
【発明の効果】以上、説明したように、本発明によれ
ば、基地局にて送信する有意データが存在しない場合
に、基地局にて、回線ごとに送信出力を停止し、且つ、
送信出力停止中に決められたのタイミングでアイドルデ
ータを送信することにより、基地局、移動局間の同期を
保持させることが可能である。それにより、他セルへの
干渉を抑制可能であり、且つ無線回線を中継する中継器
への冗長な入力を抑制でき、電力容量が厳しい中継器環
境では特に有用である。また本発明によれば、時間帯ご
と、基地局ごとに、他セルへの干渉を抑制可能であり、
且つ無線回線を中継する中継器への冗長な入力を抑制で
きる。As described above, according to the present invention, when there is no significant data to be transmitted at the base station, the base station stops the transmission output for each line, and
By transmitting idle data at a predetermined timing while the transmission output is stopped, it is possible to maintain synchronization between the base station and the mobile station. Thereby, interference with other cells can be suppressed, and redundant input to a repeater for relaying a wireless channel can be suppressed, which is particularly useful in a repeater environment where power capacity is severe. According to the present invention, for each time zone, for each base station, it is possible to suppress interference to other cells,
In addition, redundant input to a repeater that relays a wireless line can be suppressed.
【図１】本発明による無線データ通信システムを示し、
その全体構成を示す図である。FIG. 1 shows a wireless data communication system according to the present invention,
It is a figure showing the whole composition.
【図２】図１中の基地局の概略機能構成を示す図であ
る。FIG. 2 is a diagram showing a schematic functional configuration of a base station in FIG. 1;
【図３】基地局から移動局への下り回線のフォーマット
側を示す図である。FIG. 3 is a diagram showing a format side of a downlink from a base station to a mobile station.
【図４】データ転送時の基地局での動作を示す図であ
る。FIG. 4 is a diagram illustrating an operation in a base station during data transfer.
【図５】一定時間データ転送が行われない場合の基地局
の動作を示す図である。FIG. 5 is a diagram illustrating an operation of the base station when data transfer is not performed for a certain period of time.
【図６】ＤＯＸ制御中の基地局動作を示すシーケンス図
である。FIG. 6 is a sequence diagram showing an operation of the base station during DOX control.
【図７】ＤＯＸ制御停止中の基地局動作を示すシーケン
ス図である。FIG. 7 is a sequence diagram showing an operation of the base station while the DOX control is stopped.
１ 移動局 ２ 基地局 ３ 制御局 ４ データ通信網 ５ 無線回線 ６ アンテナ ７ ＲＦ装置 ８ 送信機 REFERENCE SIGNS LIST 1 mobile station 2 base station 3 control station 4 data communication network 5 wireless line 6 antenna 7 RF device 8 transmitter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 岳志 東京都港区虎ノ門二丁目10番１号 エヌ・ ティ・ティ移動通信網株式会社内 (72)発明者 井上 雅広 東京都港区虎ノ門二丁目10番１号 エヌ・ ティ・ティ移動通信網株式会社内 Ｆターム(参考） 5K033 AA06 DA01 DA19 DB20 EA02 5K067 AA03 AA13 BB04 BB21 DD51 EE02 EE10 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Yamashita 2-10-1, Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Corporation (72) Inventor Masahiro Inoue 2-chome Toranomon, Minato-ku, Tokyo No. 10 No. 1 F-term in NTT Mobile Communication Network Co., Ltd. (reference) 5K033 AA06 DA01 DA19 DB20 EA02 5K067 AA03 AA13 BB04 BB21 DD51 EE02 EE10
Claims (3)
を行う際に、前記移動局に対する送信データの有無を随
時検出し、当該検出結果に基づいて、送信データが発生
していない場合は前記基地局からの前記移動局に対する
送信出力を停止し、送信データが発生した場合には、前
記基地局からの前記移動局に対する送信出力を再開する
送信データ制御を行う無線データ通信システムにおい
て、 前記送信データ制御により前記基地局が前記移動局に対
する送信出力を停止している期間中に、アイドルデータ
を所定のタイミングで前記基地局から出力することを特
徴とする無線データ通信システム。1. When wireless data communication is performed between a base station and a mobile station, presence or absence of transmission data for the mobile station is detected as needed, and based on the detection result, no transmission data is generated. In the wireless data communication system performing transmission data control to stop the transmission output from the base station to the mobile station and, when transmission data occurs, to restart the transmission output from the base station to the mobile station, A wireless data communication system, wherein idle data is output from the base station at a predetermined timing while the base station stops transmission output to the mobile station by the transmission data control.
することを特徴とする無線データ通信システム。2. The wireless data communication system according to claim 1, wherein an upper station controls the base station when the transmission data is controlled.
停止又は再開させる機能を有することを特徴とする無線
データ通信システム。3. The wireless data communication system according to claim 1, wherein the upper station or the base station has a function of stopping or restarting the transmission data control.
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| JP2000009467A JP3597435B2 (en) | 2000-01-18 | 2000-01-18 | Wireless data communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100763581B1 (en) | 2006-11-02 | 2007-10-05 | 한국전자통신연구원 | Method for discarding service data unit of down link buffer in mobile communication system |
| JP2009260734A (en) * | 2008-04-17 | 2009-11-05 | Panasonic Corp | Wireless node system, wireless node, and synchronization method for wireless node |
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2000
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100763581B1 (en) | 2006-11-02 | 2007-10-05 | 한국전자통신연구원 | Method for discarding service data unit of down link buffer in mobile communication system |
| JP2009260734A (en) * | 2008-04-17 | 2009-11-05 | Panasonic Corp | Wireless node system, wireless node, and synchronization method for wireless node |
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