JPWO2009118878A1 - PON system - Google Patents

PON system Download PDF

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JPWO2009118878A1
JPWO2009118878A1 JP2010505105A JP2010505105A JPWO2009118878A1 JP WO2009118878 A1 JPWO2009118878 A1 JP WO2009118878A1 JP 2010505105 A JP2010505105 A JP 2010505105A JP 2010505105 A JP2010505105 A JP 2010505105A JP WO2009118878 A1 JPWO2009118878 A1 JP WO2009118878A1
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subscriber
base station
station
time
onu
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治雄 山下
治雄 山下
島田　裕一
裕一 島田
哲男 副島
哲男 副島
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Fujitsu Telecom Networks Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0644—External master-clock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0084—Quality of service aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Abstract

光スプリッタを介して複数の加入者側終端装置を局側終端装置に接続したＰＯＮシステムに関し、加入者側終端装置に無線基地局を接続し、無線通信を行う。局側終端装置ＯＬＴと光スプリッタＰＳＴを介して光回線によりそれぞれ接続した複数の加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎとを有するＰＯＮシステムであって、加入者側終端装置ＯＮＵ＃ｎに、移動端末ＭＳとの間で無線通信を行う無線基地局ＢＳを接続した構成を備え、局側終端装置ＯＬＴは、加入者側終端装置ＯＮＵ＃ｎとの間の往復伝送遅延時間を測定し、無線基地局ＢＳの無線通信の時刻同期化の為のタイムスタンプと、往復伝送遅延時間ＲＴＴの１／２の遅延時間情報とを、加入者側終端装置ＯＮＵ＃ｎを介して無線基地局ＢＳへ送信する手段を備えている。With respect to a PON system in which a plurality of subscriber-side terminators are connected to a station-side terminator via an optical splitter, a radio base station is connected to the subscriber-side terminator to perform radio communication. A PON system having a plurality of subscriber-side terminators ONU # 1 to ONU # n respectively connected by an optical line via a station-side terminator OLT and an optical splitter PST, the subscriber-side terminator ONU # n , Having a configuration in which a radio base station BS that performs radio communication with the mobile terminal MS is connected, the station-side terminal device OLT measures a round-trip transmission delay time with the subscriber-side terminal device ONU # n, The time stamp for time synchronization of the radio communication of the radio base station BS and the delay time information ½ of the round-trip transmission delay time RTT are sent to the radio base station BS via the subscriber-side terminal unit ONU # n. Means for transmitting.

Description

本発明は、ＴＤＤ（Ｔｉｍｅ Ｄｉｖｉｓｉｏｎ Ｄｕｐｌｅｘｉｎｇ）方式等の時刻同期を必要とする無線通信方式を適用する無線基地局を、加入者側終端装置（ＯＮＵ；Ｏｐｔｉｃａｌ Ｌｉｎｅ Ｕｎｉｔ）に接続したＰＯＮシステムに関する。   The present invention relates to a PON system in which a radio base station to which a radio communication scheme that requires time synchronization such as a TDD (Time Division Duplexing) scheme is applied is connected to a subscriber-side terminal unit (ONU; Optical Line Unit).

ＰＯＮ（Ｐａｓｓｉｖｅ Ｏｐｔｉｃａｌ Ｎｅｔｗｏｒｋ）システムは、光信号の分配及び合波を行う光スプリッタと局側終端装置ＯＬＴ（Ｏｐｔｉｃａｌ Ｌｉｎｅ Ｔｅｒｍｉｎａｌ）とを１本の光回線により接続し、光スプリッタと複数の加入者側終端装置ＯＮＵ（Ｏｐｔｉｃａｌ Ｌｉｎｅ Ｕｎｉｔ）とそれぞれ光回線により接続し、局側終端装置ＯＬＴから各加入者側終端装置ＯＮＵに対する情報を、それぞれ送信先アドレスを付加してパケット化し、光信号に変換して順次送信する。光スプリッタは、局側終端装置ＯＬＴからの光信号を各加入者側終端装置ＯＮＵに対して同時に分配して送信する。各加入者側終端装置ＯＮＵは、送信アドレスに従って受信処理を行う。又送信要求のある加入者側終端装置ＯＮＵに対しては、局側終端装置ＯＬＴから送信タイミング情報を通知し、加入者側終端装置ＯＮＵは、通知されたタイミングに従って送信する。それにより、光スプリッタにより各加入者側終端装置ＯＮＵからの光信号は時間的に重ならないように合成されて、局側終端装置ＯＬＴに転送される。   The PON (Passive Optical Network) system connects an optical splitter that distributes and multiplexes optical signals and a station-side terminator OLT (Optical Line Terminal) through a single optical line, and the optical splitter and a plurality of subscriber sides. It is connected to each terminating device ONU (Optical Line Unit) via an optical line, and the information from the station-side terminating device OLT to each subscriber-side terminating device ONU is packetized by adding a destination address, and converted into an optical signal. Send sequentially. The optical splitter simultaneously distributes and transmits the optical signal from the station-side terminator OLT to each subscriber-side terminator ONU. Each subscriber-side terminal unit ONU performs reception processing according to the transmission address. In addition, transmission timing information is notified from the station-side terminal device OLT to the subscriber-side terminal device ONU having a transmission request, and the subscriber-side terminal device ONU transmits according to the notified timing. Thereby, the optical signals from the subscriber-side terminators ONU are combined by the optical splitter so as not to overlap in time, and transferred to the station-side terminator OLT.

又携帯電話等の移動端末と無線基地局との間の通信方式は、既に各種提案され、且つ実用化されている。その通信方式として、例えば、ＴＤＤ（Ｔｉｍｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ）方式は、割当てられたタイミングで送信するものであり、移動端末は、複数の無線基地局のサービスエリアを移動して通信を継続する場合もあり、隣接する無線基地局のサービスエリアは一部重なるように構成する場合が一般的である。従って、それぞれのサービスエリア間では、移動端末が指定されたタイミングで送受信する為に、無線基地局の送受信タイミングを同期化する必要がある。その為に、原子時計をそれぞれの無線基地局に設けて時刻同期化を図ることが考えられる。しかし、原子時計は高価である。又全地球測位システムＧＰＳ（Ｇｌｏｂａｌ Ｐｏｓｉｔｉｏｎｉｎｇ Ｓｙｓｔｅｍ）の受信装置を設けることにより、無線基地局の送受信タイミングの同期化を図ることも可能である。   Various communication methods between mobile terminals such as mobile phones and wireless base stations have already been proposed and put into practical use. As the communication method, for example, a TDD (Time Division Multiple Access) method is used for transmission at an assigned timing, and a mobile terminal may continue to communicate by moving through service areas of a plurality of radio base stations. In general, the service areas of adjacent radio base stations are configured to partially overlap. Therefore, it is necessary to synchronize the transmission / reception timings of the radio base stations in order for the mobile terminals to transmit / receive at the designated timing between the service areas. For this purpose, it is conceivable to provide an atomic clock in each radio base station to achieve time synchronization. However, atomic clocks are expensive. It is also possible to synchronize the transmission / reception timings of the radio base stations by providing a receiver for the global positioning system GPS (Global Positioning System).

各種情報通信に於ける時刻同期手段としては、ＧＰＳ機能を利用したシステムが既に各種提案されており、例えば、複数の屋外中継車と主局との間の同期タイミングを、ＧＰＳ衛星からの受信信号を基にしたＧＰＳ時刻情報と、標準時としての時刻情報とを用いて校正した時刻を、送受信処理のタイミング信号とする手段が知られている（例えば、特許文献１参照）。又複数の無線基地局相互間の時刻同期を行う場合に、少なくとも４個のＧＰＳ衛星からの信号を受信することにより正確な時刻情報を得ることができるが、無線基地局の設置場所等により、４個のＧＰＳ衛星からの信号を全部受信できない場合、少ない個数のＧＰＳ衛星からの信号を受信して求めた不正確な時刻情報を、４個のＧＰＳ衛星からの信号を受信できる無線基地局からの正確な時刻情報を受信すると共に、その時刻情報の伝送距離情報を求めて、伝送遅延等の校正処理により正確な時刻情報を得る手段も提案されている（例えば、特許文献２参照）。   Various types of systems utilizing the GPS function have already been proposed as time synchronization means in various information communications. For example, the timing of synchronization between a plurality of outdoor relay vehicles and the main station can be received from GPS satellites. There is known a means for using a time calibrated using GPS time information based on time and time information as standard time as a timing signal for transmission / reception processing (see, for example, Patent Document 1). In addition, when performing time synchronization between a plurality of radio base stations, accurate time information can be obtained by receiving signals from at least four GPS satellites, but depending on the location of the radio base station, When all signals from four GPS satellites cannot be received, inaccurate time information obtained by receiving signals from a small number of GPS satellites is obtained from a radio base station that can receive signals from the four GPS satellites. Has also been proposed that obtains accurate time information by calibration processing such as transmission delay by obtaining transmission distance information of the time information (see, for example, Patent Document 2).

又ＰＯＮシステムに於いて、光スプリッタにより合波した光信号を直接的に光増幅して中継伝送するものではなく、一旦電気信号に変換し、光信号レベルに対応した電気信号レベルを同一となるように補正して、光信号に変換して中継伝送する手段や、スプリッタにより合波した光信号を電気信号に変換し、光信号間の間隔に相当する位置に同期パターンやアイドルパターンを挿入して、光信号に変換する中継手段等が提案されている（例えば、特許文献３，４参照）。
特開平１１−１１８９６２号公報 特開２００５−２２３７７２号公報 特開２００７−２２１６８８号公報 特開２００８−１７３２３号公報 In the PON system, the optical signal combined by the optical splitter is not directly amplified and relayed, but once converted into an electric signal, the electric signal level corresponding to the optical signal level becomes the same. The optical signal combined by the splitter or the means for relaying by converting to an optical signal is converted to an electrical signal, and a synchronization pattern or idle pattern is inserted at a position corresponding to the interval between the optical signals. Thus, a relay means for converting to an optical signal has been proposed (see, for example, Patent Documents 3 and 4).
JP-A-11-118962 Japanese Patent Laying-Open No. 2005-223772 JP 2007-221688 A JP 2008-17323 A

ＰＯＮシステムの加入者側終端装置ＯＵＮには、単一又は複数のパソコン等の通信端末が接続され、局側終端装置ＯＬＴを介して他の通信装置との間でデータ通信する構成が一般的である。例えば、図５に示すように、局側終端装置ＯＬＴと光スプリッタと複数の加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎとを有し、例えば、上り方向と下り方向との光波長を１．３μｍと１．５μｍとした波長分割多重化方式により通信し、下り方向の光信号は、光スプリッタにより全加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎに分配し、各加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎは、アドレス情報に従って自装置宛の光信号を受信処理する。又各加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎは、局側終端装置ＯＬＴによりそれぞれ指定された送信時刻情報に従って、光信号＃１、＃２、＃ｎとして示すように送信する。光スプリッタに於いて合成することにより、各光信号＃１、＃２、＃ｎは、相互に重なることなく局側終端装置ＯＬＴに送信される。これらの光信号＃１、＃２、＃ｎは、電気信号に変換されて、図示を省略したネットワークを介してそれぞれの宛先対応に送信される。その場合の上り、下りの光信号は、波長が異なり、同一ルートでも伝送遅延が異なるが、アクセス系で距離２０ｋｍ、波長差２００ｎｍと仮定した場合、３０ｎｓ程度の遅延差であるから、以下の説明に於いては、上り、下りの光信号の遅延差を無視する。   A communication terminal such as a single personal computer or a plurality of personal computers is connected to the subscriber-side terminal equipment OUN of the PON system, and a data communication with other communication devices via the station-side terminal equipment OLT is common. is there. For example, as shown in FIG. 5, it has a station-side terminator OLT, an optical splitter, and a plurality of subscriber-side terminators ONU # 1 to ONU # n. .3 μm and 1.5 μm wavelength division multiplexing are used for communication, and downstream optical signals are distributed to all subscriber-side termination devices ONU # 1 to ONU # n by an optical splitter. ONU # 1 to ONU # n receive and process an optical signal addressed to itself according to the address information. Each subscriber-side terminal device ONU # 1 to ONU # n transmits as indicated by optical signals # 1, # 2, and #n according to transmission time information respectively designated by the station-side terminal device OLT. By combining in the optical splitter, the optical signals # 1, # 2, and #n are transmitted to the station-side terminator OLT without overlapping each other. These optical signals # 1, # 2, and #n are converted into electrical signals and transmitted to each destination via a network (not shown). In this case, the upstream and downstream optical signals have different wavelengths and transmission delays are different even in the same route. However, assuming a distance of 20 km and a wavelength difference of 200 nm in the access system, the delay difference is about 30 ns. In, the delay difference between the upstream and downstream optical signals is ignored.

加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎは、光スプリッタから同一距離に配置されていない場合が多く、従って、加入者終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎ対応に伝送遅延時間が相違することにより、正確な時間管理を行わないと、光スプリッタに於いて異なる加入者側終端装置からの光信号が重なることになる。その為に、局側終端装置ＯＬＴから加入者側終端装置に対して発見プロセス（Ｄｉｓｃｏｖｅｒｙ Ｇａｔｅ）により、例えば、図６に示すように、局側終端装置ＯＬＴに於ける時刻ｔ０に於いて、その時刻をタイムスタンプｔ０（Ｔｉｍｅｓｔａｍｐ＝ｔ０）として設定した測定パケットを、加入者側終端装置ＯＮＵを指定して送信する。この測定パケットをＴｄｗｎ後に加入者側終端装置ＯＮＵが受信すると、自装置の時刻をｔ０に設定し、その時刻ｔ０から予め定めた待ち時間Ｔｗ後の時刻ｔ１をタイムスタンプｔ１（Ｔｉｍｅｓｔａｍｐ＝ｔ１）として、局側終端装置ＯＬＴへ送信する。局側終端装置ＯＬＴは、Ｔｕｐ後の時刻ｔ２に於いて受信するので、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵとの間の往復伝送遅延時間ＲＴＴ（Ｒｏｕｎｄ Ｔｒｉｐ Ｔｉｍｅ）は、ＲＴＴ＝Ｔｒｅｓ−Ｔｗ＝（ｔ２−ｔ０）−（ｔ１−ｔ０）＝ｔ２−ｔ１により求めることができる。このように、局側終端装置ＯＬＴは、各加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎとの間についての往復伝送遅延時間ＲＴＴをそれぞれ測定することができる。それにより、局側終端装置ＯＬＴは、加入者側終端装置からの送信要求に対して、光スプリッタに於いて送信光信号が重ならないように、送信タイミングを指定する。   In many cases, the subscriber-side terminal units ONU # 1 to ONU # n are not arranged at the same distance from the optical splitter, and accordingly, the transmission delay time differs depending on the subscriber terminal units ONU # 1 to ONU # n. Thus, if accurate time management is not performed, optical signals from different subscriber-side terminators overlap in the optical splitter. For this purpose, the discovery process (Discovery Gate) from the station-side terminating device OLT to the subscriber-side terminating device, for example, at time t0 in the station-side terminating device OLT as shown in FIG. A measurement packet in which the time is set as a time stamp t0 (Timestamp = t0) is transmitted by designating the subscriber-side terminal unit ONU. When the subscriber-side terminating device ONU receives this measurement packet after Tdwn, the time of the own device is set to t0, and a time t1 after a predetermined waiting time Tw from the time t0 is set as a time stamp t1 (Timestamp = t1). To the station-side terminal device OLT. Since the station-side terminal device OLT receives the signal at time t2 after Tup, the round trip transmission delay time RTT (Round Trip Time) between the station-side terminal device OLT and the subscriber-side terminal device ONU is RTT = Tres. -Tw = (t2-t0)-(t1-t0) = t2-t1. In this way, the station-side terminal device OLT can measure the round-trip transmission delay time RTT between each of the subscriber-side terminal devices ONU # 1 to ONU # n. Thereby, the station-side terminal device OLT designates the transmission timing so that the transmission optical signal does not overlap in the optical splitter with respect to the transmission request from the subscriber-side terminal device.

加入者側終端装置ＯＮＵには通常パソコン（パーソナルコンピュータ）等の通信端末を接続するシステム構成が一般的であり、このような通信端末との間の通信は、厳格な送受信時刻制御を必要としないものである。又無線通信を行う無線ＬＡＮの場合、アクセスポイントの周波数を相違させることにより、アクセスポイント間の干渉等が生じないが、無線基地局を接続し、携帯電話等の移動端末との間の無線通信を行う場合、例えばＴＤＤ方式の時分割多重通信方式等を適用すると、この無線基地局と他の無線基地局との間では、相互干渉を避ける為に、時刻同期化を行う必要がある。このような時刻同期を行う為、前述のように、原子時計を設けた構成とすると、コストアップとなって経済的に実現困難となる。   A system configuration in which a communication terminal such as a personal computer (PC) is normally connected to the subscriber-side terminal device ONU, and communication with such a communication terminal does not require strict transmission / reception time control. Is. Also, in the case of a wireless LAN that performs wireless communication, interference between access points does not occur by changing the frequency of access points, but wireless communication between mobile terminals such as mobile phones by connecting wireless base stations For example, when a TDD time division multiplex communication system is applied, time synchronization needs to be performed between the radio base station and other radio base stations in order to avoid mutual interference. In order to perform such time synchronization, as described above, when an atomic clock is provided, the cost increases and it is difficult to realize economically.

又各無線基地局にそれぞれＧＰＳ受信装置を設けて、絶対時刻同期化を図ることが考えられる。しかし、無線基地局の設置場所の制約等により、ＧＰＳ衛星からの電波を充分に受信できない場合がある。その場合に、前述の従来例の特許文献１，２等に示された技術手段を適用することが考えられる。このような補助手段を設けた場合であっても、局側終端装置ＯＬＴは、加入者側終端装置ＯＮＵの送信タイミングを指定する制御機能を有するとしても、加入者側終端装置ＯＮＵに接続された無線基地局の無線通信の時刻同期制御を行う手段を備えていないから、無線基地局に時刻同期を必要とするＴＤＤ方式等を適用することができないものであった。   In addition, it is conceivable to provide a GPS receiver in each radio base station to achieve absolute time synchronization. However, radio waves from GPS satellites may not be sufficiently received due to restrictions on the location of the wireless base station. In that case, it is conceivable to apply the technical means disclosed in Patent Documents 1 and 2 of the above-described conventional example. Even when such an auxiliary means is provided, the station-side terminating device OLT is connected to the subscriber-side terminating device ONU even though it has a control function for specifying the transmission timing of the subscriber-side terminating device ONU. Since there is no means for performing time synchronization control of wireless communication of the wireless base station, it is impossible to apply a TDD method or the like that requires time synchronization to the wireless base station.

本発明は、前述の従来例の問題点を解決することを目的とし、ＰＯＮシステムに於ける加入者側終端装置ＯＮＵに接続された無線基地局相互間の時刻同期を可能とし、コストアップすることなく、ＴＤＤ方式等を適用した無線通信を可能とするものである。又本発明は、ＰＯＮシステムの特別の場合に相当する１分岐システム（ポイントーツウーポイント）にも適用可能であり、時刻同期信号を有線システムから無線基地局へ伝送するシステムにも適用可能である。   An object of the present invention is to solve the above-described problems of the conventional example, and to enable time synchronization between radio base stations connected to a subscriber-side terminal unit ONU in a PON system, thereby increasing costs. In addition, wireless communication using the TDD method or the like is possible. The present invention can also be applied to a one-branch system (point-to-point) corresponding to a special case of a PON system, and can also be applied to a system that transmits a time synchronization signal from a wired system to a wireless base station. .

本発明のＰＯＮシステムは、局側終端装置と光スプリッタを介して光回線によりそれぞれ接続した複数の加入者側終端装置とを有するＰＯＮシステムであって、加入者側終端装置に、移動端末との間で時分割無線通信を行う無線基地局を備え、局側終端装置は、加入者側終端装置との間の往復伝送遅延時間を測定し、無線基地局の無線通信の時刻同期化の為のタイムスタンプと、往復伝送遅延時間の１／２の遅延時間情報とを、加入者側終端装置を介して無線基地局へ送信する手段を備えている。   The PON system of the present invention is a PON system having a plurality of subscriber-side terminators connected by an optical line via a station-side terminator and an optical splitter, and the subscriber-side terminator is connected to a mobile terminal. A wireless base station that performs time-division wireless communication between them, the station-side terminal device measures the round-trip transmission delay time with the subscriber-side terminal device, and synchronizes the time of wireless communication of the wireless base station. Means is provided for transmitting a time stamp and delay time information that is ½ of the round-trip transmission delay time to the radio base station via the subscriber-side terminal device.

又局側終端装置は、無線基地局に対するタイムスタンプを、ＧＰＳ受信装置からの時刻同期信号により形成する構成を備えることができる。又局側終端装置は、加入者側終端装置との間の往復伝送遅延時間と、この加入者側終端装置と無線基地局との間の往復伝送遅延時間とをそれぞれ測定し、無線基地局の無線通信の時刻同期化の為のタイムスタンプと、加入者側終端装置との間の往復伝送遅延時間の１／２と、加入者側終端装置と無線基地局との間の往復伝送遅延時間の１／２とを、加入者側終端装置を介して無線基地局へ送信する手段を備えることができる。   The station-side terminal device can be configured to form a time stamp for the radio base station by a time synchronization signal from the GPS receiver. The station-side terminal device measures the round-trip transmission delay time between the subscriber-side terminal device and the round-trip transmission delay time between the subscriber-side terminal device and the radio base station. Time stamp for radio communication time synchronization, 1/2 of the round trip transmission delay time between the subscriber side termination device, and round trip transmission delay time between the subscriber side termination device and the radio base station A means for transmitting 1/2 to the radio base station via the subscriber-side terminal device can be provided.

又局側終端装置と加入者側終端装置と無線基地局との間を、第１の光スプリッタを介した伝送経路と第２の光スプリッタを介した伝送経路との何れか一方を現用系、他方を予備系として切替える二重化切替部を介して接続した構成とすることができる。   In addition, between the station-side terminator, the subscriber-side terminator, and the radio base station, either the transmission path via the first optical splitter or the transmission path via the second optical splitter is used as the active system, It is possible to adopt a configuration in which the other is connected via a duplex switching unit that switches as a standby system.

ＰＯＮシステムの加入者側終端装置に無線基地局を接続し、移動端末との間で時分割通信方式等により無線通信する場合の時刻同期を、例えば、ＧＰＳ受信装置による時刻情報を基準とし、局側終端装置と加入者側終端装置との間の往復伝送遅延時間を計測して、タイムスタンプによる時刻情報と伝送遅延時間とを通知することにより、受信した時刻情報を伝送遅延時間に応じて補正することにより、無線基地局では無線通信の為の時刻同期を正確に行うことができる。   Time synchronization when a wireless base station is connected to a subscriber-side terminal device of the PON system and wireless communication is performed with a mobile terminal by a time division communication method or the like, for example, with reference to time information by a GPS receiver, Measures the round-trip transmission delay time between the terminal device on the side and the subscriber-side terminal device, and notifies the time information and the transmission delay time by the time stamp to correct the received time information according to the transmission delay time. As a result, the radio base station can accurately perform time synchronization for radio communication.

本発明の実施例１の説明図である。It is explanatory drawing of Example 1 of this invention. 本発明の実施例１の要部機能ブロック図である。It is a principal part functional block diagram of Example 1 of this invention. 本発明の実施例２の処理説明図である。It is processing explanatory drawing of Example 2 of this invention. 本発明の実施例３の説明図である。It is explanatory drawing of Example 3 of this invention. 従来例の説明図である。It is explanatory drawing of a prior art example. 従来例の説明図である。It is explanatory drawing of a prior art example.

本発明のＰＯＮシステムは、図１を参照して説明すると、局側終端装置ＯＬＴと光スプリッタＰＳＴを介して光回線によりそれぞれ接続した複数の加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎとを有するＰＯＮシステムであって、加入者側終端装置ＯＮＵ＃ｎに、移動端末ＭＳとの間で時分割無線通信を行う無線基地局ＢＳを備え、局側終端装置ＯＬＴは、加入者側終端装置ＯＮＵ＃ｎとの間の往復伝送遅延時間を測定し、無線基地局ＢＳの時分割無線通信の時刻同期化の為のタイムスタンプと、往復伝送遅延時間ＲＴＴの１／２の遅延時間情報とを、加入者側終端装置ＯＮＵ＃ｎを介して無線基地局ＢＳへ送信する手段を備えている。   The PON system of the present invention will be described with reference to FIG. 1. A plurality of subscriber-side terminators ONU # 1 to ONU # n respectively connected by an optical line via a station-side terminator OLT and an optical splitter PST. The subscriber-side termination device ONU # n includes a radio base station BS that performs time-division wireless communication with the mobile terminal MS, and the station-side termination device OLT is a subscriber-side termination device ONU. Measure the round trip transmission delay time with #n, and the time stamp for time synchronization of the time division radio communication of the radio base station BS, and the delay time information of 1/2 of the round trip transmission delay time RTT, Means for transmitting to the radio base station BS via the subscriber-side terminal unit ONU # n is provided.

図１は、本発明の実施例１の説明図であり、（Ａ）はシステムの概要説明図、（Ｂ）は伝送パケットの説明図である。図１の（Ａ）に於いて、局側終端装置ＯＬＴに光スプリッタＰＳＴを介して複数の加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎを、それぞれ光回線により接続したＰＯＮシステムを構成し、複数の加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎの中の１個の加入者側終端装置ＯＮＵ＃ｎに、ＴＤＤ方式等を適用して移動端末ＭＳとの間の無線通信を行う無線基地局ＢＳを接続し、この無線基地局ＢＳのサービスエリア内の単一又は複数の移動端末ＭＳが、局側終端装置ＯＬＴに接続したネットワーク（図示を省略）を介して有線又は無線の加入者との間で、音声通話やデータ通信を行うシステム構成であり、例えば、ＧＰＳ受信装置ＧＰＳＲからの時刻情報を用いた時刻同期信号ＴＳＳを局側終端装置ＯＬＴに入力し、この時刻同期信号ＴＳＳを基に、局側終端装置ＯＬＴから無線基地局ＢＳの時刻同期化の制御を行う。なお、無線基地局ＢＳは、他の加入者側終端装置ＯＮＵにも接続したシステム構成、又は、図示を省略した他の局側終端装置ＯＬＴ配下となる加入者側終端装置ＯＮＵに接続した構成、又は既存のネットワークに接続した構成とすることができる。ＰＯＮシステムの加入者側終端装置に接続された無線基地局ＢＳは、局側終端装置ＯＬＴから加入者側終端装置ＯＮＵ＃ｎを介して伝送された時刻情報によりＴＤＤ方式等を適用する為の時刻同期化の制御を行うものである。又時刻同期信号ＴＳＳとしては、例えば、同期網に於ける網同期信号等の安定化された同期信号を、他の無線基地局と共に使用する構成とすることも可能である。   1A and 1B are explanatory diagrams of a first embodiment of the present invention, in which FIG. 1A is a schematic explanatory diagram of a system, and FIG. 1B is an explanatory diagram of a transmission packet. In FIG. 1A, a PON system in which a plurality of subscriber-side terminators ONU # 1 to ONU # n are connected to a station-side terminator OLT via an optical splitter PST via an optical line, respectively. A radio base for performing radio communication with a mobile terminal MS by applying a TDD scheme or the like to one subscriber-side terminator ONU # n among a plurality of subscriber-side terminators ONU # 1 to ONU # n A station BS is connected, and a single or a plurality of mobile terminals MS within the service area of the radio base station BS communicate with a wired or wireless subscriber via a network (not shown) connected to the station-side terminal device OLT. For example, a time synchronization signal TSS using time information from the GPS receiver GPSR is input to the station-side terminal device OLT, and the time synchronization signal TSS is used as a basis. Controls the time synchronization of the wireless base station BS from the station side terminating device OLT. The radio base station BS has a system configuration connected to another subscriber-side termination device ONU, or a configuration connected to a subscriber-side termination device ONU under the other station-side termination device OLT (not shown), Or it can be set as the structure connected to the existing network. The radio base station BS connected to the subscriber-side terminal device of the PON system uses the time information transmitted from the station-side terminal device OLT via the subscriber-side terminal device ONU # n to apply the TDD method or the like. Controls synchronization. Further, as the time synchronization signal TSS, for example, a stabilized synchronization signal such as a network synchronization signal in a synchronization network can be used with other radio base stations.

図１の（Ｂ）に示す伝送パケットは、局側終端装置ＯＬＴから加入者側終端装置ＯＮＵ＃ｎへ送信する伝送パケットの一例の要部を示し、ヘッダ部のＤＡは加入者側終端装置ＯＮＵ＃ｎを示す送信先アドレス、ＳＡは局側終端装置ＯＬＴを示す送信元アドレスであり、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵとの間の論理的接続の識別の為の論理リンク識別子ＬＬＩＤ（Ｌｏｇｉｃａｌ Ｌｉｎｋ Ｉｄｅｎｔｉｆｉｅｒ）を、伝送パケットの図示を省略した例えばプリアンブル内に設ける。又図示を省略した伝送パケットのタイプとレングスとの情報を含むものであり、又情報ペイロードに、時刻同期の為のタイムスタンプＴＰと、伝送遅延時間ＴＤ（往復伝送遅延時間ＲＴＴの１／２）との情報を付加する。加入者側終端装置ＯＮＵ＃ｎは、この伝送遅延時間ＴＤの情報とタイムスタンプＴＰによる時刻情報とを用いて、無線基地局ＢＳの時刻同期化処理の制御を行うものである。この場合のタイムスタンプＴＰは、局側終端装置ＯＬＴに於いてＧＰＳ受信装置ＧＰＳＲからの時刻情報を用いた時刻同期信号ＴＳＳを基に生成する。加入者側終端装置ＯＮＵ＃ｎは、このタイムスタンプＴＰと伝送遅延時間ＴＤとを無線基地局ＢＳへ送信し、無線基地局ＢＳは、予め設定された送受信タイミング間隔を、タイムスタンプＴＰによる時刻情報を、伝送遅延時間ＴＤの情報により補正して、時分割無線通信を行う。従って、ＧＰＳ受信装置ＧＰＳＲによる時刻同期信号ＴＳＳに基づいて、高精度で時分割無線通信を行うことができる。   The transmission packet shown in FIG. 1B shows a main part of an example of a transmission packet transmitted from the station-side terminal device OLT to the subscriber-side terminal device ONU # n, and DA in the header part is the subscriber-side terminal device ONU. A transmission destination address indicating #n, SA is a transmission source address indicating the station-side termination device OLT, and a logical link identifier for identifying a logical connection between the station-side termination device OLT and the subscriber-side termination device ONU An LLID (Logical Link Identifier) is provided in, for example, a preamble in which a transmission packet is not shown. The information includes information on the type and length of the transmission packet (not shown). The information payload includes a time stamp TP for time synchronization and a transmission delay time TD (1/2 of the round trip transmission delay time RTT). Information is added. The subscriber-side terminating device ONU # n controls the time synchronization processing of the radio base station BS using the information on the transmission delay time TD and the time information based on the time stamp TP. The time stamp TP in this case is generated based on the time synchronization signal TSS using the time information from the GPS receiver GPSR in the station-side terminal device OLT. The subscriber-side terminal device ONU # n transmits the time stamp TP and the transmission delay time TD to the radio base station BS, and the radio base station BS sets a preset transmission / reception timing interval as time information based on the time stamp TP. Is corrected by the information of the transmission delay time TD, and time division wireless communication is performed. Therefore, time-division wireless communication can be performed with high accuracy based on the time synchronization signal TSS by the GPS receiver GPSR.

図２は、本発明の実施例１の要部機能ブロック図であり、局側終端装置ＯＬＴと光スプリッタＰＳＴを介して光回線により接続された加入者側終端装置ＯＮＵと、この加入者側終端装置ＯＮＵに接続された無線基地局ＢＳとを示し、ＧＰＳ衛星受信装置や移動端末については図示を省略している。又１１は送受信制御部、１２は時刻同期化処理部、１３は光電変換部（Ｏ／Ｅ）、１４は電光変換部（Ｅ／Ｏ）、１５、２１は光信号分離合成部、２２は電光変換部（Ｅ／Ｏ）、２３は光電変換部（Ｏ／Ｅ）、２４は時刻同期化処理部、２５は送受信制御部、２６は入出力インタフェース部を示す。   FIG. 2 is a functional block diagram of the main part of the first embodiment of the present invention. The subscriber-side terminator ONU connected by the optical line via the station-side terminator OLT and the optical splitter PST, and the subscriber-side terminator The radio base station BS connected to the device ONU is shown, and the GPS satellite receiver and mobile terminal are not shown. Also, 11 is a transmission / reception control unit, 12 is a time synchronization processing unit, 13 is a photoelectric conversion unit (O / E), 14 is an electro-optical conversion unit (E / O), 15 and 21 are optical signal separation / combination units, and 22 is an electro-optical unit. A conversion unit (E / O), 23 is a photoelectric conversion unit (O / E), 24 is a time synchronization processing unit, 25 is a transmission / reception control unit, and 26 is an input / output interface unit.

局側終端装置ＯＬＴは、図示を省略したネットワーク側との間の送受信処理及びＧＰＳ受信装置等からの時刻情報ＴＳＳの受信処理を行う送受信制御部１１と、加入者側終端装置ＯＮＵとの間の往復伝送遅延時間ＲＴＴの測定処理手段を含み、加入者側終端装置ＯＮＵ及び無線基地局ＢＳに対する時刻情報の送信処理等を行う時刻同期化処理部１２と、光信号と電気信号とのそれぞれ変換処理を行う光電変換部１３及び電光変換部１４と、電光変換部１４からの光信号を送信し、受信した光信号を光電変換部１３に入力する光信号分離合成部１５とを含む手段を備えている。   The station-side terminal device OLT is a transmission / reception control unit 11 that performs transmission / reception processing with the network side (not shown) and reception processing of the time information TSS from the GPS reception device, etc., and the subscriber-side terminal device ONU. A time synchronization processing unit 12 that includes a measurement processing means for the round trip transmission delay time RTT and performs processing for transmitting time information to the subscriber-side terminal unit ONU and the radio base station BS, and a conversion process for each of an optical signal and an electric signal A means including a photoelectric conversion unit 13 and an electro-optic conversion unit 14 that perform transmission, and an optical signal separation / synthesis unit 15 that transmits an optical signal from the electro-optic conversion unit 14 and inputs the received optical signal to the photoelectric conversion unit 13. Yes.

又加入者側終端装置ＯＮＵは、光スプリッタＰＳＴに接続された光信号分離合成部２１と、送信信号を光信号に変換する光電変換部２２と、受信した光信号を電気信号に変換する光電変換部２３と、局側終端装置ＯＬＴからの発見プロセス等に従った時刻情報の送受信により、無線基地局ＢＳの時刻同期を含めて正確な時刻情報ＴＳＳに対して時刻同期化を行う時刻同期化処理部２４と、無線基地局ＢＳとの間の送受信処理を行う入出力インタフェース部２６を含む手段を備えている。   The subscriber-side terminating device ONU includes an optical signal separation / combination unit 21 connected to the optical splitter PST, a photoelectric conversion unit 22 that converts a transmission signal into an optical signal, and a photoelectric conversion that converts a received optical signal into an electrical signal. Time synchronization processing for performing time synchronization with respect to accurate time information TSS including time synchronization of the radio base station BS by transmission / reception of time information in accordance with a discovery process from the unit 23 and the station side terminal OLT A unit including an input / output interface unit 26 that performs transmission / reception processing between the unit 24 and the radio base station BS is provided.

局側終端装置ＯＬＴの時刻同期化処理部１２は、光スプリッタＰＳＴを介して接続された加入者側終端装置ＯＮＵとの間の往復伝送遅延時間ＲＴＴを、前述の発見プロセス等に従った処理により測定し、ＧＰＳ受信装置からの時刻情報ＴＳＳを基に、図１の（Ｂ）に示す伝送パケットのタイムスタンプＴＰと伝送遅延時間ＴＤ（＝ＲＴＴ／２）とを形成して加入者側終端装置ＯＮＵへ通知する。加入者側終端装置ＯＮＵは、タイムスタンプＴＰと伝送遅延時間ＴＤとを基に、無線基地局ＢＳに於ける送受信時刻同期の為の時刻情報を形成して通知する。この時刻情報は、ＧＰＳ受信装置からの時刻情報ＴＳＳを基にして、伝送遅延時間ＴＤにより補正したものに相当し、正確な時刻情報を示すものであるから、無線基地局ＢＳに於ける送受信タイミング制御を、他の無線基地局との間で同期化することができる。   The time synchronization processing unit 12 of the station-side terminal device OLT determines the round-trip transmission delay time RTT with the subscriber-side terminal device ONU connected via the optical splitter PST by processing according to the above discovery process or the like. Based on the time information TSS from the GPS receiver, the time stamp TP and the transmission delay time TD (= RTT / 2) of the transmission packet shown in FIG. Notify ONU. Based on the time stamp TP and the transmission delay time TD, the subscriber-side terminal unit ONU forms and notifies time information for transmission / reception time synchronization in the radio base station BS. This time information corresponds to the information corrected by the transmission delay time TD based on the time information TSS from the GPS receiver, and shows accurate time information. Therefore, the transmission / reception timing at the radio base station BS is shown. Control can be synchronized with other radio base stations.

図３は、本発明の実施例２の時刻同期化の処理説明図であり、（Ａ）は往復伝送遅延時間測定の説明図、（Ｂ）は伝送パケットの説明図であって、加入者側終端装置と無線基地局との間の伝送遅延時間を無視できない場合、補正処理により、時刻同期の正確さを向上するものであり、図３の（Ａ）は、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵと無線基地局ＢＳとのそれぞれの間の伝送遅延時間を、発見プロセスに従って求める過程を示すものである。即ち、局側終端装置ＯＬＴに於ける時刻ｔ０（ｌｏｃａｌ ｔｉｍｅ＝ｔ０）を設定した測定パケットを、局側終端装置ＯＬＴから加入者側終端装置ＯＮＵへ送出する。加入者側終端装置ＯＮＵは、この測定パケットを受信して、自装置の時刻をｔ０にセットし、且つ無線基地局ＢＳに対して転送する。無線基地局ＢＳも自装置の時刻としてｔ０（ｌｏｃａｌ ｔｉｍｅ＝ｔ０）にセットし、予め設定された待ち時間後に、無線基地局ＢＳの時刻ｔ１（ｌｏｃａｌ ｔｉｍｅ＝ｔ１）をタイムスタンプとして付加した測定パケットを加入者側終端装置ＯＮＵへ送出する。   3A and 3B are explanatory diagrams of time synchronization processing according to the second embodiment of the present invention. FIG. 3A is an explanatory diagram of round-trip transmission delay time measurement, and FIG. 3B is an explanatory diagram of a transmission packet. When the transmission delay time between the terminating device and the radio base station cannot be ignored, the accuracy of time synchronization is improved by correction processing. FIG. 3A shows the station-side terminating device OLT and the subscriber. It shows the process of obtaining the transmission delay time between the side termination unit ONU and the radio base station BS according to the discovery process. That is, a measurement packet in which the time t0 (local time = t0) in the station-side terminal device OLT is set is transmitted from the station-side terminal device OLT to the subscriber-side terminal device ONU. The subscriber-side terminating device ONU receives this measurement packet, sets its own time to t0, and transfers it to the radio base station BS. The radio base station BS also sets the time of its own device to t0 (local time = t0), and after the waiting time set in advance, the measurement packet in which the time t1 (local time = t1) of the radio base station BS is added as a time stamp. To the subscriber-side terminal unit ONU.

加入者側終端装置ＯＮＵは、自局に設定した時刻ｔ０（ｌｏｃａｌ ｔｉｍｅ＝ｔ０）を基にして、無線基地局ＢＳから返送された測定パケットを時刻ｔ２に於いて受信すると、この到着時刻ｔ２と、時刻ｔ０から所定の待ち時間後の時刻ｔ３とを、タイムスタンプとして付加した測定パケットを、時刻ｔ３に局側終端装置ＯＬＴへ送出する。局側終端装置ＯＬＴは、時刻ｔ４にこの測定パケットを受信すると、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵとの間の往復伝送遅延時間ＲＴＴ（＝ｔ４−ｔ３）と、加入者側終端装置ＯＮＵと無線基地局ＢＳとの間の往復伝送遅延時間ＲＴＴ（＝ｔ２−ｔ１）とを求めることができる。この加入者側終端装置ＯＮＵと無線基地局ＢＳとの間の往復伝送遅延時間ＲＴＴは、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵとの間の往復伝送遅延時間ＲＴＴの補正分に相当する。   When the subscriber-side terminal unit ONU receives the measurement packet returned from the radio base station BS at the time t2 based on the time t0 (local time = t0) set in its own station, Then, a measurement packet to which time t3 after a predetermined waiting time from time t0 is added as a time stamp is sent to station-side terminal device OLT at time t3. When receiving the measurement packet at time t4, the station-side terminal device OLT receives the round trip transmission delay time RTT (= t4-t3) between the station-side terminal device OLT and the subscriber-side terminal device ONU, and the subscriber-side terminal device. The round trip transmission delay time RTT (= t2-t1) between the device ONU and the radio base station BS can be obtained. The round-trip transmission delay time RTT between the subscriber-side terminating device ONU and the radio base station BS corresponds to a correction for the round-trip transmission delay time RTT between the station-side terminating device OLT and the subscriber-side terminating device ONU. .

局側終端装置ＯＬＴは、加入者側終端装置ＯＮＵを介して無線基地局ＢＳに送信するパケットを、例えば、図３の（Ｂ）に示すように、送信先アドレスＤＡと送信元アドレスＳＡとをヘッダに付加し、情報ペイロードに、時刻同期の為のタイムスタンプＴＳと、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵとの間の往復伝送遅延時間ＲＴＴの１／２に相当する伝送遅延時間ＴＤと、加入者側終端装置ＯＮＵと無線基地局ＢＳとの間の往復伝送遅延時間ＲＴＴの１／２に相当する伝送遅延時間ＴＤ１とを付加した構成とする。この場合のタイムスタンプＴと伝送遅延時間ＴＤとは、図１の（Ｂ）に示す場合と同様であるが、加入者側終端装置ＯＮＵと無線基地局ＢＳとの間の伝送遅延時間も考慮しなければならない場合に、補正分に相当したものとなり、加入者側終端装置ＯＮＵと無線基地局ＢＳとの間の距離が長い場合の伝送遅延分を補正することができる。   The station-side terminator OLT sends a packet to be transmitted to the radio base station BS via the subscriber-side terminator ONU, for example, as shown in FIG. 3B, with a destination address DA and a source address SA. The transmission delay time corresponding to 1/2 of the time stamp TS for time synchronization and the round trip transmission delay time RTT between the station-side terminal device OLT and the subscriber-side terminal device ONU is added to the header and the information payload. TD and a transmission delay time TD1 corresponding to 1/2 of the round trip transmission delay time RTT between the subscriber-side terminal unit ONU and the radio base station BS are added. In this case, the time stamp T and the transmission delay time TD are the same as those shown in FIG. 1B, but the transmission delay time between the subscriber-side terminating device ONU and the radio base station BS is also considered. If this is the case, it corresponds to the correction amount, and the transmission delay amount when the distance between the subscriber-side terminal unit ONU and the radio base station BS is long can be corrected.

図４は、本発明の実施例３の説明図であり、ＯＬＴは局側終端装置、ＩＦ１，ＩＦ２はＰＯＮインタフェース、ＧＰＳＲはＧＰＳ受信装置、ＰＳＴ１、ＰＳＴ２は光スプリッタ、ＯＮＵ＃１〜ＯＮＵ＃ｎは加入者側終端装置、ＳＷは二重化切替部、ＢＳは無線基地局、ＭＳは移動端末を示す。ＧＰＳ受信装置ＧＰＳＲからの時刻同期信号ＴＳＳを基に、無線基地局ＢＳに於ける無線送受信の時刻同期制御を行う構成は、前述の各実施例１，２と同様であり、この実施例３に於いては、無線基地局ＢＳを接続した加入者側終端装置ＯＮＵ＃ｎと局側終端装置ＯＬＴとの間を、光スプリッタＰＳＴ１を介した経路と、光スプリッタＰＳＴ２を介した経路との二重化構成とし、何れか一方を現用系、他方を予備系として、現用系伝送経路の障害発生時には、二重化切替部ＳＷによって予備系伝送経路に切替える。それにより、無線基地局ＢＳを介した移動端末ＭＳによる無線通信の信頼性を向上するものである。   FIG. 4 is an explanatory diagram of a third embodiment of the present invention, where OLT is a station side termination device, IF1 and IF2 are PON interfaces, GPSR is a GPS receiver, PST1 and PST2 are optical splitters, ONU # 1 to ONU # n Is a subscriber-side terminal device, SW is a duplex switching unit, BS is a radio base station, and MS is a mobile terminal. The configuration for performing time synchronization control of radio transmission / reception at the radio base station BS based on the time synchronization signal TSS from the GPS receiver GPSR is the same as in the first and second embodiments. In this case, a duplex configuration of a path via the optical splitter PST1 and a path via the optical splitter PST2 between the subscriber-side terminal equipment ONU # n and the station-side terminal equipment OLT connected to the radio base station BS is provided. One of them is used as a working system and the other is used as a standby system, and when a failure occurs in the working system transmission path, the duplex switching unit SW switches to the backup system transmission path. Thereby, the reliability of radio communication by the mobile terminal MS via the radio base station BS is improved.

又局側終端装置ＯＬＴと各加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎとの間の光スプリッタＰＳＴ１を介した伝送経路の往復伝送遅延時間ＲＴＴ測定を前述のように行って、局側終端装置ＯＬＴに於いて加入者側終端装置ＯＮＵ＃１〜ＯＮＵ＃ｎ対応に記憶し、且つ必要に応じて、無線基地局ＢＳと加入者側終端装置ＯＮＵ＃ｎとの間の往復伝送遅延時間ＲＴＴを測定して、局側終端装置ＯＬＴと加入者側終端装置ＯＮＵ＃ｎとの間の往復伝送遅延時間補正値として記憶する。又局側終端装置ＯＬＴのＰＯＮインタフェースＩＦ２と光スプリッタＰＳＴ２を介して接続された加入者側終端装置との間についても同様に往復伝送遅延時間ＲＴＴを測定するもので、その場合の加入者側終端装置ＯＮＵ＃ｎに対しては、現用予備切替時点の発見プロセスによる測定パケットの送受信により測定することができる。従って、現用予備切替えによっても、無線基地局ＢＳに於ける時刻同期を継続して維持することができる。   In addition, the round trip transmission delay time RTT measurement of the transmission path via the optical splitter PST1 between the station-side terminator OLT and each subscriber-side terminator ONU # 1 to ONU # n is performed as described above. In the device OLT, it is stored corresponding to the subscriber-side termination devices ONU # 1 to ONU # n, and if necessary, the round-trip transmission delay time RTT between the radio base station BS and the subscriber-side termination device ONU # n Is measured and stored as a round-trip transmission delay time correction value between the station-side terminal device OLT and the subscriber-side terminal device ONU # n. In addition, the round trip transmission delay time RTT is also measured between the PON interface IF2 of the station-side terminator OLT and the subscriber-side terminator connected via the optical splitter PST2, and the subscriber-side terminator in that case is measured. For the device ONU # n, measurement can be performed by transmitting and receiving a measurement packet by a discovery process at the time of active standby switching. Therefore, the time synchronization in the radio base station BS can be continuously maintained even by the active standby switching.

又無線基地局ＢＳと二重化切替部を介して、光スプリッタＰＳＴ１に接続した現用系の加入者側終端装置と、光スプリッタＰＳＴ２に接続した予備系の加入者側終端装置とを接続し、無線基地局ＢＳに対して、二重化切替部により、現用系の加入者側終端装置と予備系の加入者終端装置とを、現用系の障害発生により予備系に切替える構成とすることも可能である。   The active subscriber side terminator connected to the optical splitter PST1 and the standby subscriber side terminator connected to the optical splitter PST2 are connected via the radio base station BS and the duplex switching unit to the radio base station. For the station BS, it is also possible to adopt a configuration in which the active subscriber-side terminating device and the standby subscriber terminating device are switched to the standby system when a failure occurs in the working system by the duplex switching unit.

産業上の利用の可能性Industrial applicability

局側終端装置ＯＬＴと加入者側終端装置ＯＮＵと無線基地局ＢＳとを含み、移動端末ＭＳと無線基地局ＢＳとの間で時刻同期を必要とする無線通信を行うシステムに適用可能であり、電気信号による伝送系と光信号による伝送系と無線信号による伝送系とを含めて、無線通信の時刻同期化により、無線基地局ＢＳは無線通信を安定に行うことができる。   It is applicable to a system that includes a station-side terminal device OLT, a subscriber-side terminal device ONU, and a radio base station BS, and performs radio communication that requires time synchronization between the mobile terminal MS and the radio base station BS, The wireless base station BS can stably perform wireless communication by time synchronization of wireless communication including a transmission system using an electrical signal, a transmission system using an optical signal, and a transmission system using a wireless signal.

Claims (4)

局側終端装置と光スプリッタを介して光回線によりそれぞれ接続した複数の加入者側終端装置とを有するＰＯＮシステムに於いて、
前記加入者側終端装置に、移動端末との間で無線通信を行う無線基地局を備え、
前記局側終端装置は、前記加入者側終端装置との間の往復伝送遅延時間を測定し、前記無線基地局の前記無線通信の時刻同期化の為のタイムスタンプと前記往復伝送遅延時間の１／２の遅延時間情報とを前記加入者側終端装置を介して前記無線基地局へ送信する手段を備えた
ことを特徴とするＰＯＮシステム。In a PON system having a station-side terminal device and a plurality of subscriber-side terminal devices connected respectively by optical lines via an optical splitter,
The subscriber-side terminal device includes a radio base station that performs radio communication with a mobile terminal,
The station-side terminal device measures a round-trip transmission delay time with the subscriber-side terminal device, and calculates a time stamp for time synchronization of the radio communication of the radio base station and 1 of the round-trip transmission delay time. A PON system comprising means for transmitting the delay time information of / 2 to the radio base station via the subscriber-side terminal device. 前記局側終端装置は、前記無線基地局に対する前記タイムスタンプを、ＧＰＳ受信装置からの時刻同期信号により形成する構成を備えたことを特徴とする請求項１記載のＰＯＮシステム。   2. The PON system according to claim 1, wherein the station-side terminal device is configured to form the time stamp for the radio base station by a time synchronization signal from a GPS receiver. 前記局側終端装置は、前記加入者側終端装置との間の往復伝送遅延時間と、該加入者側終端装置と前記無線基地局との間の往復伝送遅延時間とをそれぞれ測定し、前記無線基地局の前記無線通信の時刻同期化の為のタイムスタンプと前記加入者側終端装置との間の前記往復伝送遅延時間の１／２と、前記加入者側終端装置と前記無線基地局との間の前記往復伝送遅延時間の１／２とを、前記加入者側終端装置を介して前記無線基地局へ送信する手段を備えたことを特徴とする請求項１記載のＰＯＮシステム。   The station-side termination device measures a round-trip transmission delay time between the subscriber-side termination device and a round-trip transmission delay time between the subscriber-side termination device and the radio base station, respectively. A time stamp for time synchronization of the radio communication of the base station and half of the round-trip transmission delay time between the subscriber-side termination device, and between the subscriber-side termination device and the radio base station The PON system according to claim 1, further comprising means for transmitting ½ of the round-trip transmission delay time between the wireless base station to the wireless base station via the subscriber-side terminal device. 前記局側終端装置と前記加入者側終端装置と前記無線基地局との間を、第１の光スプリッタを介した伝送経路と第２の光スプリッタを介した伝送経路との何れか一方を現用系、他方を予備系として切替える二重化切替部を介して接続した構成を備えたことを特徴とするＰＯＮシステム。   Either the transmission path via the first optical splitter or the transmission path via the second optical splitter is used between the station-side termination apparatus, the subscriber-side termination apparatus, and the wireless base station. A PON system comprising a system connected via a duplex switching unit that switches the other as a standby system.
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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5025581B2 (en) * 2008-07-04 2012-09-12 株式会社日立製作所 Communication system and communication apparatus
CN102231653B (en) * 2009-12-31 2014-04-02 华为技术有限公司 Microwave access method and multi-service transmission equipment
CN102377556B (en) * 2010-08-19 2016-04-13 中兴通讯股份有限公司 A kind ofly realize the synchronous method and system of active and standby optical line terminal timestamp
WO2011143948A1 (en) * 2011-01-26 2011-11-24 华为技术有限公司 Method and system for implementing time synchronization
US9154292B2 (en) 2012-11-28 2015-10-06 Mitsubishi Electric Corporation Communication apparatus, communication system, and time synchronization method
JP6363960B2 (en) * 2015-01-15 2018-07-25 日本電信電話株式会社 Communication control method and communication apparatus
JP6359983B2 (en) * 2015-02-09 2018-07-18 日本電信電話株式会社 Station side optical line termination device and discovery processing execution method
JP6359984B2 (en) * 2015-02-09 2018-07-18 日本電信電話株式会社 Station side optical line termination device and discovery processing execution method
JP6095077B2 (en) * 2015-03-26 2017-03-15 ▲ホア▼▲ウェイ▼技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． Method and system for realizing time synchronization
JP7223228B2 (en) * 2019-02-15 2023-02-16 日本電信電話株式会社 Derivation method, communication system and accommodation station device
JP7223229B2 (en) * 2019-02-15 2023-02-16 日本電信電話株式会社 Derivation method, communication system and accommodation station device
CN114866175A (en) * 2021-02-03 2022-08-05 华为技术有限公司 Communication method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000023245A (en) * 1998-07-07 2000-01-21 Fujitsu Ltd Time synchronization method for cdma system
JP2000349801A (en) * 1999-03-30 2000-12-15 Nec Corp Method and device for protection changeover for pon
JP2004166047A (en) * 2002-11-14 2004-06-10 Mitsubishi Electric Corp Multibranched communication system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3137300B2 (en) * 1992-01-27 2001-02-19 日本電信電話株式会社 Automatic switching of optical transmission system
JPH08256099A (en) * 1995-03-17 1996-10-01 Fujitsu Ltd Mobile object communication system, radio base station and centralized base station used for the system
JP2785789B2 (en) * 1996-02-09 1998-08-13 日本電気株式会社 Digital mobile communication system
JP2940479B2 (en) * 1996-07-22 1999-08-25 日本電気株式会社 Line multiplexer
JP2002094449A (en) * 2000-09-19 2002-03-29 Hitachi Kokusai Electric Inc Radio access system
JP4256804B2 (en) * 2004-03-08 2009-04-22 富士通株式会社 Multi antenna system
JP4693518B2 (en) * 2005-06-22 2011-06-01 三菱電機株式会社 Multicast communication apparatus and PON system using the same
JP2007116374A (en) * 2005-10-19 2007-05-10 Mitsubishi Electric Corp Passive optical network system and subscriber terminal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000023245A (en) * 1998-07-07 2000-01-21 Fujitsu Ltd Time synchronization method for cdma system
JP2000349801A (en) * 1999-03-30 2000-12-15 Nec Corp Method and device for protection changeover for pon
JP2004166047A (en) * 2002-11-14 2004-06-10 Mitsubishi Electric Corp Multibranched communication system

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