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WO2012003746A1 - Procédé et dispositif de réalisation d'horloge frontière - Google Patents

Procédé et dispositif de réalisation d'horloge frontière Download PDF

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Publication number
WO2012003746A1
WO2012003746A1 PCT/CN2011/074696 CN2011074696W WO2012003746A1 WO 2012003746 A1 WO2012003746 A1 WO 2012003746A1 CN 2011074696 W CN2011074696 W CN 2011074696W WO 2012003746 A1 WO2012003746 A1 WO 2012003746A1
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WO
WIPO (PCT)
Prior art keywords
timestamp
message
base station
packet
clock
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.)
Ceased
Application number
PCT/CN2011/074696
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English (en)
Chinese (zh)
Inventor
罗丽
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ZTE Corp
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ZTE Corp
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Publication date
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Publication of WO2012003746A1 publication Critical patent/WO2012003746A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0673—Clock or time synchronisation among packet nodes using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet
    • 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
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays

Definitions

  • the present invention relates to the field of network synchronous clocks, and in particular, to a method and apparatus for implementing a boundary clock in an IEEE 1588 protocol for cascading wireless base stations. Background technique
  • Time Division Duplex (TDD) systems such as CDMA2000, TD-SCDMA, LTE (TDD), WIMAX, etc.
  • TDD Time Division Duplex
  • LTE LTE
  • WIMAX WIMAX
  • standard product source methods such as Global Positioning System (GPS) are widely used in various product lines, but the installation cost of GPS is high.
  • GPS Global Positioning System
  • PTP Precision Time Synchronization Protocol
  • the wireless base station is generally used as a terminal device and is hung on the transmission network.
  • the main implementation mode of the wireless base station is an OC (Ordinary Clock) mode, that is, each base station achieves synchronization by synchronizing the same clock source in the system.
  • OC Organic Clock
  • a common base station layout is shown in FIG. 1.
  • the IEEE 1588 reference source needs to have multiple BTS base stations, but the reference source band load capacity is limited, so the number of BTS base stations that can be carried is limited. If you increase the number of wireless base stations, you need to add additional GPS devices or higher precision clock sources as reference sources. This will be greatly increased. If you want to add a base station without adding a reference source, you need to use a device such as a switch to connect to the BTS base station, but the use of the switch poses a reliability risk. Summary of the invention
  • an object of the present invention is to provide a method and apparatus for implementing a boundary clock for cascading wireless base stations, which increases the number of wireless base stations in a communication network by implementing a boundary clock on the wireless base station.
  • a method for implementing a boundary clock in the IEEE 1588 protocol provided by the present invention includes:
  • step A) Adjusts the local clock based on the Toffset determined by the time stamps T1, ⁇ 2, ⁇ 3, and ⁇ 4.
  • the packet is parsed, and if the packet is a synchronization packet, the receiving timestamp is saved.
  • the step B) is:
  • the synchronization message included in the synchronization message is extracted.
  • the transmission time stamp of the synchronization message included in the next following message of the synchronization message is extracted.
  • the step C) is:
  • the sending time stamp is saved.
  • the step D) is:
  • the packet is a delayed request response packet that includes a receiving timestamp of the delay request message received by the upper-level BTS base station, discarding the generated receiving timestamp, and extracting the The delay request response is a receipt time stamp of the delay request in the text.
  • Toffset and the time stamps T1, ⁇ 2, ⁇ 3, and ⁇ 4 satisfy the following relationship:
  • an apparatus for implementing a boundary clock in the IEEE 1588 protocol including:
  • a timestamp generating and holding unit configured to generate and save a receiving timestamp T2 of the synchronization message by receiving the synchronization message from the upper-level BTS base station, and send a delay request message to the upper-level BTS base station, Generating and saving a transmission timestamp T3 of the delay request message;
  • a timestamp extracting unit configured to parse the synchronization packet sent by the upper-level BTS base station, a delay request response message, which is received by the upper-level BTS base station, and includes a reception timestamp T4, which receives the delay request message, and receives a reception timestamp T4 of the delay request message;
  • the clock adjustment unit is configured to determine Toffset according to the time stamps T1, ⁇ 2, ⁇ 3, and ⁇ 4, and adjust the local clock by using the Toffset.
  • the device also includes:
  • a switching unit configured to pass between the timestamp generation and saving unit and the timestamp extracting unit
  • a timestamp delivery unit is configured to pass the timestamp T2 and the timestamp T3 to the clock adjustment unit.
  • the timestamp generation and saving unit includes:
  • a timestamp processing subunit configured to receive a synchronization message from the upper BTS base station, generate a reception time stamp T2 of the synchronization message, and send a delay request message to the upper BTS base station to generate the delay Timestamp T3 of the request message
  • the timestamp buffer subunit is configured to buffer the receiving timestamp T2 of the synchronization message and the sending timestamp T3 of the delay request message.
  • the present invention implements an IEEE 1588 boundary clock device and method, which is applied to a wireless base station cascade, and has the following technical effects:
  • a high-precision clock reference source can hang more BTS base stations, thereby solving the problem of increasing the cost of base station construction caused by the main equipment, and avoiding the traditional The reliability risk of using a switch to connect to a BTS base station in an application environment where the base stations are stacked.
  • FIG. 1 is a schematic diagram of a common base station layout provided by the prior art
  • FIG. 2 is a schematic diagram of a method for networking a base station boundary clock provided by the present invention
  • FIG. 3 is a block diagram of a device according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of a method for implementing a slave clock function by a local BTS base station according to an embodiment of the present invention
  • FIG. 5 is a flow chart of a method for implementing a master clock function by a local BTS base station according to an embodiment of the present invention. detailed description
  • the basic idea of the present invention is: receiving a synchronization message from a BTS base station of a base station transceiver station, generating and storing a reception time stamp T2 of the synchronization message; parsing the synchronization message, and extracting a transmission timestamp T1 of the synchronization message Sending a delay request message to the upper-level BTS base station, generating and saving a transmission timestamp T3 of the delay request message; receiving and parsing the returned delay request message returned by the upper-level BTS base station Receiving the delayed request response message of the timestamp T4, extracting the receiving timestamp T4 of the delay request message; adjusting the local clock according to the clock offset Toffset determined by the timestamps T1, ⁇ 2, ⁇ 3, and ⁇ 4 .
  • FIG. 2 is a schematic diagram of a method for networking a base station boundary clock provided by the present invention.
  • a BTS base station is synchronized with a master clock master having a standard reference source, and can also be used as reference for several lower-level BTS base stations.
  • the clock implements the boundary clock function.
  • the clock port of the master clock master may have multiple logical ports or multiple physical ports, so that the reference clock source of the next-level BTS base station can be used.
  • a slave clock port of a BTS base station that implements a boundary clock function is connected to one of the clock ports of the external master clock master, and is configured to receive 1588 packets such as synchronization packets of the upper-level master clock, so that the local clock and the local clock are The upper level master clock is synchronized, realized
  • the slave clock function the BTS base station also has multiple master clock ports, which can be connected to the slave clock port of the next-level BTS base station, and send 1588 packets such as synchronization packets to the next-stage BTS base station, so that the next-level BTS The base station can synchronize with the clock of the BTS base station to implement the main clock function.
  • the method of implementing the cascading of the wireless base station by using the IEEE 1588 boundary clock can increase the number of connections of the BTS base station without increasing the master device, thereby greatly reducing the construction cost of the base station; in addition, the cascading of the device no longer uses the switch. It is a multi-clock port that uses a boundary clock to make clock synchronization more accurate.
  • the device includes a timestamp generation and saving unit, a timestamp transmission unit, a switching unit, a timestamp extraction unit and a clock adjustment unit that form a protocol stack processing module. , among them:
  • the timestamp generation and saving unit is the lowest layer of message delivery, including a timestamp processing subunit and a timestamp buffer subunit.
  • the timestamp processing sub-unit detects a frame preamble of each of the passed 1588 messages, generates a flag for extracting the local time, and generates a timestamp.
  • the timestamp generation and saving unit also needs to cache the clock identifier and the sequence identifier for corresponding to the corresponding message.
  • the 1588 packet mainly includes a synchronization packet, a follow-up packet, a delay request packet, and a delay request response packet.
  • the synchronization packet sending timestamp and the delay request packet are sent.
  • the receiving timestamp of the text is generated in the timestamp processing subunit and cached in the timestamp buffer subunit.
  • the receiving timestamp of the synchronization message and the sending timestamp of the delay request message are The timestamp processing subunit is generated and cached in a timestamp cache subunit.
  • the timestamp extraction unit is a timestamp extraction part of the protocol stack processing module, which receives and parses the message transmitted by the timestamp processing subunit through the switching unit, and extracts the timestamp from the message for reading by the clock adjustment unit. , receiving timestamp of synchronization message and sending of delayed request message The timestamp is extracted and cached in the timestamp extraction unit.
  • the clock adjustment unit is a clock adjustment part of the protocol stack processing module, configured to read, from the timestamp extraction unit, a transmission timestamp T1 of the synchronization message of the upper-level BTS base station and a reception timestamp of the delay request message.
  • the timestamp delivery unit reads the reception timestamp T2 of the synchronization message in the timestamp buffer subunit and the transmission timestamp T3 of the delay request message, and determines Toffset according to the four timestamps, and adjusts the local clock.
  • the working principle of the device is as follows:
  • the timestamp processing subunit of the local BTS base station receives the synchronization packet sent by the upper-level BTS base station from the clock port, detects the frame preamble of the packet, generates a flag for extracting the local time, and generates a reception time stamp T2 of the synchronization packet.
  • the timestamp T2 is sent to the timestamp buffer subunit for reading by the clock adjustment unit; the timestamp extraction unit receives the synchronization packet delivered by the timestamp processing subunit through the switching unit. And parsing the packet, and extracting a transmission timestamp T1 of the synchronization packet according to the clock mode configured by the parsed packet. If it is a one-step clock mode, the timestamp T1 is directly extracted in the synchronization message, and if it is the two-step clock mode, the timestamp T1 is extracted in the next following message of the synchronization message.
  • the protocol stack processing module sends a delay request message to the BTS base station, and the delay request message passes through the switching unit to reach the timestamp processing subunit, and the timestamp processing subunit detects the frame preamble of the 4th message and Forming a flag for extracting the local time, generating a transmission timestamp ⁇ 3 of the text, and when parsing the message as a delay request message, sending the message to the upper-level BTS base station, and sending the delay request
  • the transmission timestamp of the message ⁇ 3 is stored in the timestamp buffer subunit for reading by the clock adjustment unit.
  • the timestamp processing subunit receives the delay request response message of the receiving time stamp ⁇ 4 of the delay request message sent by the previous BTS base station, and detects the frame preamble of the message. A flag for extracting the local time is generated, and a receiving timestamp of the packet is generated. When the packet is parsed as a delayed request response packet, the generated timestamp is discarded, and the timestamp is discarded.
  • the unit passes the message to the timestamp extracting unit, parses the message by the timestamp extracting unit, and extracts the receiving timestamp T4 of the delayed request message from the cached timestamp.
  • the clock adjustment unit reads the time stamps T1, ⁇ 2, ⁇ 3, and ⁇ 4, determines Toffset, and adjusts the local clock.
  • Toffset can be determined by the following formula (1):
  • Toffset (T4 - T3)+(T1 - T2) ( 1 )
  • Time of the previous BTS base station time of the local BTS base station + Toffset ( 2 )
  • the local BTS base station receives the synchronization message sent by the upper BTS base station, generates the reception time stamp T2 of the synchronization message, and synchronizes the message or the next message.
  • the sending time stamp T1 of the synchronization message is extracted from a follow message, and the following formula (3) can be established.
  • T2 T1 + Td- Toffset (3)
  • the local BTS base station sends a delay request message to the BTS base station, generates a timestamp T3 of the delay request message, and then receives the delay time sent by the BTS base station.
  • the request message receives the timestamp T4 delay request response message, and extracts the timestamp T4.
  • the following formula (4) can be established:
  • T3 T4-Td- Toffset (4)
  • Td is the path delay when the message is transmitted between BTS base stations
  • the time of the local BTS base station plus Toffset is used to synchronize the clock of the local BTS base station.
  • the above method of calculating the Toffset is not limited thereto, and the Toffset may be calculated by various other timestamps using four time stamps.
  • the synchronization packet is periodically sent to the next-level BTS through the slave clock port.
  • the timestamp processing subunit detects the frame preamble of the packet and forms a flag for extracting the local time, and generates a transmission timestamp of the synchronization packet, when parsing
  • the timestamp is retained; the message is parsed to obtain a configuration clock mode of the message, and if it is a one-step clock mode, the timestamp is placed in the synchronization message, if it is two steps.
  • the timestamp is placed in the subsequent following message and sent to the next-level BTS base station, and according to the response condition of the next-level BTS base station, other related messages are sent, so that the next-level BTS base station completes the clock synchronization. .
  • the sender needs to record an accurate transmission time
  • the receiver needs to record an accurate reception time, thereby determining Toffset and realizing clock synchronization.
  • FIG. 4 is a flowchart of a method for implementing a slave clock function by a local BTS base station according to an embodiment of the present invention. As shown in FIG. 4, the method includes the following steps:
  • the timestamp processing subunit detects a frame preamble of the message transmitted from the unique slave clock port, and generates a flag capable of extracting the local time;
  • S402 the flag extracts the local time, and generates a timestamp to save
  • S403 Parse whether the received packet is a synchronization packet, and if it is a synchronization packet, perform S404, otherwise discard the reserved timestamp;
  • the protocol stack processing module obtains and parses the packet through the switching unit. If the synchronization packet is parsed, the command to read the timestamp T2 is initiated, and the timestamp in the timestamp buffer subunit is read by the timestamp delivery unit. T2;
  • the protocol stack processing module parses the synchronization packet. If the synchronization packet is in the one-step clock mode, the timestamp T1 of the synchronization message sent by the upper-level BTS base station is parsed from the synchronization message, and if it is a two-step clock mode, Extracting the timestamp T1 from the subsequently received follow message and storing it in the cache; S407: After extracting the timestamp T1, the protocol stack processing module sends a delay request message, and reaches the timestamp processing subunit through the switching unit;
  • the timestamp processing subunit receives the delay request message, and generates a sending timestamp T3 of the delay request message, and when it is parsed into the delay request message, performs S409; otherwise, the reserved timestamp is discarded;
  • S409 Save the timestamp T3 to the timestamp cache subunit, and the protocol stack processing unit extracts the timestamp T3 from the timestamp cache subunit by using the timestamp delivery unit;
  • the protocol stack processing module receives and parses the delay request response sent by the upper-level BTS base station, and obtains the receiving timestamp T4 when the upper-level BTS base station receives the delay request, and stores the timestamp.
  • Cache subunit
  • S411 Read Tl, ⁇ 2, ⁇ 3, and ⁇ 4, determine Toffset, and adjust the local clock.
  • FIG. 5 is a flowchart of a method for implementing a master clock function by a local BTS base station according to an embodiment of the present invention. As shown in FIG. 5, the method includes the following steps:
  • the protocol stack processing module periodically sends a synchronization packet to the next-level BTS base station through the primary clock port, and reaches the timestamp processing sub-unit through the switching unit.
  • the timestamp processing subunit detects a frame preamble of the packet, and generates a flag for extracting the local time, and generates a sending timestamp of the packet.
  • S504 Send, according to the clock mode configured by the packet, the timestamp, that is, the transmission timestamp T1 of the synchronization packet, to the next-level BTS base station;
  • the timestamp T1 is placed in the synchronization message; if it is a two-step clock mode, the timestamp T1 is placed in the subsequent following message and sent to the next-level BTS base station;
  • S505 The timestamp processing subunit receives the delay request packet sent by the next-level BTS base station, and generates a receiving timestamp of the packet.
  • S506 The timestamp processing subunit parses whether the message is a delay request message. If it is a delay request message, the timestamp, that is, the receiving timestamp T4 of the delay request message is put into the timestamp buffer subunit. , otherwise discard the timestamp;
  • the timestamp delivery unit reads the timestamp T4 from the timestamp cache subunit, and puts the timestamp into the delay request response message.
  • the sending unit, the time stamp processing subunit, and the main clock port connected to the next level BTS base station are sent out.
  • the local BTS base station When the local BTS base station performs the slave clock of the upper-level BTS base station, it can be performed according to the steps shown in FIG. 4, and when the master clock of the next-stage BTS base station is used, the procedure shown in FIG. 5 can be performed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé et un dispositif de réalisation d'une horloge frontière (« boundary clock »), et appartient au domaine des horloges synchrones de réseau. Le procédé comprend les étapes suivantes : une estampille temporelle de réception T2 d'un message de synchronisation est générée par réception du message de synchronisation en provenance d'une station d'émission-réception de base (BTS) de niveau supérieur ; une estampille temporelle d'envoi T1 du message de synchronisation contenue dans le message de synchronisation ou un message de continuation est analysée et extraite ; un message de requête de retard est envoyé à la BTS de niveau supérieur, et une estampille temporelle d'envoi T3 dudit message de requête de retard est générée et sauvegardée ; un message de réponse à la requête de retard renvoyé par la BTS de niveau supérieur est reçu et analysé, et une estampille temporelle de réception T4 du message de requête de retard est extraite ; en fonction des estampilles temporelles T1 à T4, un décalage d'horloge est déterminé, et l'horloge locale est ajustée. La présente invention permet à une source de référence d'horloge de haute précision de soutenir davantage de BTS, en conséquence, le problème de coût de construction élevé de la station de base est résolu, et le risque de fiabilité dû à l'utilisation d'un central est évité.
PCT/CN2011/074696 2010-07-07 2011-05-26 Procédé et dispositif de réalisation d'horloge frontière Ceased WO2012003746A1 (fr)

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CN2010102196155A CN101895384A (zh) 2010-07-07 2010-07-07 一种实现边界时钟的方法和装置

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Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101895384A (zh) * 2010-07-07 2010-11-24 中兴通讯股份有限公司 一种实现边界时钟的方法和装置
CN102006660B (zh) * 2010-11-26 2015-08-12 中兴通讯股份有限公司 一种时间同步的方法和系统
CN102958067B (zh) * 2011-08-19 2016-08-31 南京中兴新软件有限责任公司 一种基站及其组网方法和共享天馈系统
CN102916758B (zh) * 2012-10-10 2016-01-06 北京东土科技股份有限公司 以太网时间同步装置和网络设备
CN103152118B (zh) * 2013-02-07 2015-08-12 中兴通讯股份有限公司 一种基带单元和射频单元数据业务同步方法、装置和系统
CN103457714A (zh) * 2013-08-19 2013-12-18 国家电网公司 同步服务器时间的方法及系统
CN104202812A (zh) * 2014-08-14 2014-12-10 杭州绿宇通信技术有限公司 一种适用于精确定位系统的高精度时间同步的方法
CN106341218A (zh) * 2015-07-06 2017-01-18 北京东土军悦科技有限公司 一种基于windows操作系统的时钟同步方法及装置
CN106487467B (zh) * 2015-08-26 2020-10-13 深圳市中兴通讯技术服务有限责任公司 一种时间同步偏差检测方法和装置
WO2017124288A1 (fr) 2016-01-19 2017-07-27 华为技术有限公司 Procédé et dispositif de transmission de paquets d'horloge
CN106130710B (zh) * 2016-06-29 2019-11-08 北京东土科技股份有限公司 一种时钟同步方法及系统
WO2018060441A1 (fr) * 2016-09-30 2018-04-05 Net Insight Intellectual Property Ab Synchronisation temporelle dans un système de distribution de contenu en direct
WO2018120173A1 (fr) * 2016-12-30 2018-07-05 华为技术有限公司 Procédé d'échange de message de synchronisation temporelle, et dispositif de réseau
WO2019104522A1 (fr) * 2017-11-29 2019-06-06 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et dispositifs associés à un réseau flexe
CN110176973B (zh) * 2019-05-17 2020-12-04 固高科技(深圳)有限公司 时钟同步的方法、系统、计算机设备和存储介质
CN114095093A (zh) * 2021-10-14 2022-02-25 南京国电南自电网自动化有限公司 一种基于fpga实现无线光差通信的终端、系统及方法
CN115361084B (zh) * 2022-08-23 2025-03-25 歌尔科技有限公司 一种同步时钟的方法、装置、设备及介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080075217A1 (en) * 2006-09-22 2008-03-27 Ilnicki Slawomir K Mechanism For Making Delay From Network Elements Transparent To IEEE 1588 Protocols
CN101425865A (zh) * 2007-10-31 2009-05-06 大唐移动通信设备有限公司 传输网中的时钟同步方法、系统和从时钟侧实体
CN101459691A (zh) * 2008-12-16 2009-06-17 中兴通讯股份有限公司 一种实现ieee1588协议中边界时钟的方法和系统
CN101895384A (zh) * 2010-07-07 2010-11-24 中兴通讯股份有限公司 一种实现边界时钟的方法和装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4195901B2 (ja) * 2003-02-05 2008-12-17 インターデイジタル テクノロジー コーポレーション ワイヤレス通信システムにおける初期セルサーチ
CN101510834A (zh) * 2008-02-15 2009-08-19 中国移动通信集团公司 端到端网络时延的测量方法、装置及系统
CN101330342B (zh) * 2008-07-30 2011-11-30 中兴通讯股份有限公司 一种用端口镜像实现时间同步协议的方法及其装置
CN101738600B (zh) * 2008-11-14 2012-05-30 武汉大学 高频地波雷达组网的时钟同步控制装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080075217A1 (en) * 2006-09-22 2008-03-27 Ilnicki Slawomir K Mechanism For Making Delay From Network Elements Transparent To IEEE 1588 Protocols
CN101425865A (zh) * 2007-10-31 2009-05-06 大唐移动通信设备有限公司 传输网中的时钟同步方法、系统和从时钟侧实体
CN101459691A (zh) * 2008-12-16 2009-06-17 中兴通讯股份有限公司 一种实现ieee1588协议中边界时钟的方法和系统
CN101895384A (zh) * 2010-07-07 2010-11-24 中兴通讯股份有限公司 一种实现边界时钟的方法和装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SHU, BANGJIU ET AL.: "Research on the types of clock devices in IEEE 1588 standard.", ELECTRONIC TECHNOLOGY., December 2009 (2009-12-01), pages 42 - 44 *

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