WO2014194517A1 - Procédé et dispositif d'émission de données - Google Patents

Procédé et dispositif d'émission de données Download PDF

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Publication number
WO2014194517A1
WO2014194517A1 PCT/CN2013/076944 CN2013076944W WO2014194517A1 WO 2014194517 A1 WO2014194517 A1 WO 2014194517A1 CN 2013076944 W CN2013076944 W CN 2013076944W WO 2014194517 A1 WO2014194517 A1 WO 2014194517A1
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WO
WIPO (PCT)
Prior art keywords
data
ethernet
clock
ethernet message
interface
Prior art date
Application number
PCT/CN2013/076944
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English (en)
Chinese (zh)
Inventor
李孝朋
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/076944 priority Critical patent/WO2014194517A1/fr
Priority to CN2013800007752A priority patent/CN103404226A/zh
Publication of WO2014194517A1 publication Critical patent/WO2014194517A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and device for transmitting data. Background technique
  • the radio base station system includes a BBU (Base Band Unit) and an RRU (Remote Radio Unit).
  • the BBU is also called REC (Radio Eupment Controller), and the RRU is also called RE (Radio Equipment, Radio Euipment).
  • RE is connected to the REC through an optical interface or SFP high-speed cable, and CPRI is used.
  • the public radio interface Common Public Radio Interface
  • OBSAI Open Base Station Architecture Initiative
  • the transmission network is constantly evolving, mainly from 1GE (1 Gigabit Ethernet, Gigabit Ethernet) to higher 10GE (10 Gigabit Ethernet, 10 Gigabit Ethernet), or even 100GE (100 Gigabit Ethernet, 100 Gigabit Ethernet). Evolution; At the same time, synchronization protocols within the transport network (such as the IEEE (American Institute of Electrical and Electronics Engineers) 1588 protocol) are also widely used.
  • the base station In addition to the development of the transmission network, the base station is also constantly developing. When the wireless base station system is deployed by using the existing transmission networking resources, the wireless base station system is caused by the interface protocol limitation of the interface between the existing REC and the RE.
  • the communication between the REC and the RE cannot utilize the existing transmission networking resources, so the resources are not well saved and the cost is reduced.
  • the present invention provides a method and a device for transmitting data, which are used to solve the limitation of the interface protocol between the existing REC and the RE in the prior art, and the communication between the REC and the RE in the wireless base station system cannot be Utilize existing transmission networking resources, so it can not save resources well Low cost issues.
  • a method of transmitting data including:
  • converting the received first data into the first Ethernet text includes:
  • the encapsulating one of the at least one data segment into one of the first Ethernet packets includes:
  • the first synchronization information is used to indicate a location of the one data segment in the first data.
  • the converting the second Ethernet packet into the second data includes Decapsulating the second Ethernet packet, and extracting the data segment in the second Ethernet packet;
  • the extracted data segments are composed of the second data.
  • the second Ethernet packet includes second synchronization information
  • the second synchronization information is used to indicate a position of the corresponding data segment in the second data.
  • the method further includes:
  • Clock synchronization is performed by at least one of the following methods:
  • the time synchronization is performed by using the timestamp
  • the clock is synchronized according to the associated clock based on the associated clock recovered from the received data stream of the Ethernet.
  • a conversion device including: an Ethernet physical layer interface and an interface processing module;
  • the interface processing module is configured to convert the first data sent by the first device in the wireless base station system to the second device in the wireless base station system into the first Ethernet packet, and send the data to the Ethernet physical a layer interface, the Ethernet physical layer interface, configured to send the first Ethernet packet converted by the interface processing module to the second device;
  • the Ethernet physical layer interface is configured to receive a second Ethernet packet obtained by the second device to be sent by the second device to the first device, and receive the received second Ethernet packet.
  • the file is sent to the interface processing module, and the interface processing module is configured to convert the received second Ethernet packet from the Ethernet physical layer interface into the second data.
  • the interface processing module is specifically configured to:
  • the interface processing module is specifically configured to:
  • the first synchronization information is used to indicate a location of the one data segment in the first data.
  • the interface processing module is specifically configured to:
  • the interface processing module is specifically configured to:
  • the second synchronization information is used to indicate a position of the corresponding data segment in the second data.
  • the device further includes:
  • a clock module for clock synchronization in at least one of the following ways:
  • the time synchronization is performed by using the timestamp
  • the clock is synchronized according to the associated clock based on the associated clock recovered from the received data stream of the Ethernet.
  • the converting device is REC or RE.
  • the Ethernet physical layer interface is One of the column physical interfaces:
  • the embodiment of the present invention can convert the first data sent by the first device in the wireless base station system to the second device in the wireless base station system into the first Ethernet packet; and/or will be sent by the second device
  • the second Ethernet packet obtained by converting the second data of the first device is converted into the second data.
  • the embodiment of the present invention can convert between the Ethernet packet and the data, thereby realizing the fusion of the wireless base station system and the Ethernet transmission protocol, and also realizing the data transmission between the RE and the REC by using the Ethernet, thereby reducing the cost. . DRAWINGS
  • FIG. 1 is a schematic diagram of a mapping relationship between an embodiment of the present invention and a CPRI protocol
  • FIG. 2A is a schematic flowchart of a method for converting data into an Ethernet packet according to an embodiment of the present invention
  • FIG. 2B is a schematic flowchart of a method for converting an Ethernet packet into data according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a first conversion device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of an Ethernet physical connection according to an embodiment of the present invention.
  • 6A is a schematic diagram of clock synchronization when a first Ethernet bearer network is connected according to an embodiment of the present invention
  • 6B is a schematic diagram of clock synchronization when a second Ethernet bearer network is connected according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a first connection according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a second connection according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a second conversion device according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention can implement that the first data sent by the first device in the wireless base station system to the second device in the wireless base station system is converted into the first Ethernet packet; and/or The second Ethernet packet obtained by the second data conversion sent by the device to the first device is converted into the second data.
  • the embodiment of the present invention can convert between the Ethernet packet and the data, thereby realizing the fusion of the wireless base station system and the Ethernet transmission protocol, and also realizing the data transmission between the RE and the REC by using the Ethernet, thereby reducing the cost. .
  • the mapping relationship between the embodiment of the present invention and the CPRI protocol is shown in the figure.
  • the physical layer of the CPRI corresponds to the Ethernet physical layer of the embodiment of the present invention, and is used to provide a path for transmitting data for the device;
  • the data between the REC and the RE (including the control plane, the maintenance plane, and the user plane) is sent by using an Ethernet packet, which is implemented by the upper layer of the Layer 2, including the network layer, the transport layer, and the application layer. Wait;
  • CPRI synchronization can be implemented by means of synchronous Ethernet or IEEE 1588. It can be implemented by different layers of interface communication according to different synchronization modes, or by different layers or layers. For example, for synchronous Ethernet, it is mainly implemented by Ethernet Layerl and Layer2. Specifically, Layerl is used to recover the clock, Layer2 is used to transmit the quality of the synchronous Ethernet; for IEEE 1588, its timestamp message. It can be carried on Layer 2 or Layer 3. Specifically, Layer 2 can be used to broadcast 1588 packets through MAC (Medium Access Control) multicast. You can also use Layer 3 IP (Internet Protocol) to The end mode performs 1588 message transmission; if it is synchronized by an external clock such as GPS (Global Positioning Systems, Global Positioning System), it does not need to be implemented in the relevant layer of the interface.
  • GPS Global Positioning Systems, Global Positioning System
  • the synchronized clock indicator is to meet the specifications specified by the wireless air interface protocol.
  • the method for converting data into an Ethernet packet in the embodiment of the present invention includes the following steps:
  • Step 201 Convert the first data sent by the first device in the radio base station system to the second device in the radio base station system into a first Ethernet packet.
  • Step 202 Send the first Ethernet packet to the second device.
  • Step 210 Receive a second Ethernet packet obtained by the second data conversion sent by the second device to the first device.
  • Step 211 Convert the second Ethernet packet into the second data.
  • the first data is divided into at least one data segment; and one of the at least one data segment is encapsulated into one of the first Ethernet packets.
  • the data segment is encapsulated into an Ethernet packet, and the method further includes:
  • the first synchronization information is used to indicate a location of the one data segment in the first data.
  • the data between the REC and the RC includes data such as a control plane, a maintenance plane, and a user plane.
  • the control plane and the maintenance plane are based on HDLC (High Level Data Link Control) or ETH (Ethernet) packets, which are transmitted based on the message mode and can be smoothed.
  • the ETH message is transmitted; wherein the user plane data is mainly IQ (modulation) data, which belongs to the continuous data stream, and is sent after being fragmented and converted into an Ethernet packet.
  • each slice may be sequentially sent in the order of the data segments of each slice in the entire data (this way may not carry synchronization information, preferably carrying synchronization information); Fragments are not sent in order. If the fragment is not sent in sequence, the receiving side needs to cache a certain amount, and relies on the synchronization information carried in the packet to restore the original order.
  • the synchronization information here may be the location of the corresponding data segment in the wireless air interface, and may also be a sequence number for the corresponding data segment. It should be noted that the synchronization information in the embodiment of the present invention is not limited. In the above two manners, other information indicating the position of the corresponding data segment in the data can be used as the synchronization information of the embodiment of the present invention.
  • the corresponding conversion processing should be performed according to the actual application, and then encapsulated into an Ethernet packet for transmission.
  • the general data transmission is a pure time-division multiplexing method similar to IQ (TDM (Time Division Multiplex) over TDM), that is, the above-mentioned fragmentation processing can be used; the other is similar to HDLC/
  • the ETH over CPRI mode (PACKAGE over TDM) can be sent based on ETH packets.
  • the conversion between CPRI and Ethernet is equivalent to TDM OVER TDM and PACKAGE OVER TDM (ie CPRI) converted to TDM OVER PACKAGE and PACKAGE OVER PACKAGE (ie Ethernet).
  • step 211 the second Ethernet packet is decapsulated, and the data segment in the second Ethernet packet is extracted;
  • the extracted data segments are composed of the second data.
  • Method 1 Pre-set the number of data segments.
  • the set number of second Ethernet packets are decapsulated and the data segments in the second Ethernet packet are extracted, the set number of data segments are formed into the second data.
  • the received second Ethernet packet reaches a preset number
  • the second Ethernet packet of the preset number is decapsulated, and the preset number is extracted. a data segment in the second Ethernet packet
  • a second Ethernet packet may also be received, and the second Ethernet packet is decapsulated to extract the data segment in the second Ethernet packet.
  • the second synchronization information is used to indicate the location of the corresponding data segment in the second data.
  • Frequency synchronization maintains the frequency synchronization of points, they can be any phase; time synchronization requires absolute time synchronization between points. At least one:
  • the time synchronization is performed by using the timestamp
  • Clock synchronization is performed based on the associated clock recovered from the received data stream of the Ethernet.
  • there are many ways to synchronize the clock through the received clock reference source such as the 1PPS + TOD mode under GPS and the clock reference source through the clock server.
  • synchronous Ethernet that is, clock synchronization based on the associated clock recovered from the received data stream of the Ethernet.
  • the clock is synchronized by the received time-stamped Ethernet packet.
  • the time synchronization is achieved by satisfying the timestamp "" of the IEEE1588 protocol, and the clock is better. Synchronization performance.
  • Ethernet needs to rely on a clock reference source with a relatively high clock level as a reference clock to generate an Ethernet working clock to transmit Ethernet data, such as BITS (Building Integrated Timing (Building Integrated Timing) Supply) System) provides a clock reference source for the operating clock of the synchronous Ethernet.
  • BITS Building Integrated Timing (Building Integrated Timing) Supply
  • BITS can be integrated on the REC side, or it can be integrated into one device or integrated into other devices.
  • the REC can be used as the clock source of the clock synchronization.
  • the devices that need to perform clock synchronization (including RE or other REC, etc.) in the entire Ethernet network pass the 1PPS + TOD mode. At this time, the clock is synchronized with the REC side by the REC according to the local clock generation, synchronous Ethernet, IEEE 1588, and the like. If the REC side is synchronized and the clock accuracy meets the wireless air interface index, the REC can be used as the clock server.
  • the devices that need to perform clock synchronization (including REs or other RECs) in the entire Ethernet network can be clocked with the REC through IEEE 1588 or the like. Synchronize.
  • a conversion device is also provided in the embodiment of the present invention. Since the method has similar principles to the method of the embodiment of the present invention, the implementation of the device may refer to the implementation of the method, and the repeated description is not repeated.
  • the conversion device of the embodiment of the present invention includes: an Ethernet physical layer interface 400 and an interface processing module 410.
  • the interface processing module 410 is configured to convert the first data sent by the first device in the wireless base station system to the second device in the wireless base station system into a first Ethernet packet, and send the data to the Ethernet a physical layer interface 400, the Ethernet physical layer interface 400, configured to send the first Ethernet packet converted by the interface processing module 410 to the second device; and/or
  • the Ethernet physical layer interface 400 is configured to receive a second Ethernet packet obtained by the second device and sent by the second device, and receive the second Ethernet The packet is sent to the interface processing module 410.
  • the interface processing module 410 is configured to convert the received second Ethernet packet from the Ethernet physical layer interface 400 into the second data.
  • the interface processing module 410 is specifically configured to:
  • the interface processing module 410 encapsulates the first synchronization information of the one data segment and the one data segment into one first Ethernet packet;
  • the first synchronization information is used to indicate a location of the one data segment in the first data.
  • the interface processing module 410 is specifically configured to:
  • the interface processing module 410 is specifically configured to: Determining, by the second synchronization information in the second Ethernet packet, the data segment extracted from the second Ethernet packet into the second data;
  • the second synchronization information is used to indicate a position of the corresponding data segment in the second data.
  • the device of the embodiment of the present invention may further include: a clock module 420.
  • a clock module 420 configured to perform clock synchronization by using a received clock reference source
  • the time synchronization is performed by using the timestamp
  • the clock is synchronized according to the associated clock based on the associated clock recovered from the received data stream of the Ethernet.
  • the conversion device of the embodiment of the invention is REC or RE.
  • Ethernet physical layer interface 400 of the embodiment of the present invention may be one of the following physical interfaces:
  • the Gigabit Ethernet interface includes an interface defined by a protocol such as 1000Base-SX, 1000Base-LX, and 1000Base-T of the cable;
  • the 10G Ethernet interface includes optical fiber-based interfaces such as 10GBASE-X, 10GBASE-R, 10GBASE-W, and copper-based 10GBASE-T.
  • 40G Ethernet interface includes cable-based 40GBASE-CR4, fiber-based 40GBASE-SR4/LR4 and other protocols specified by the protocol;
  • the 100G Ethernet interface includes cable-based 100GBASE-CR10, fiber-based interfaces such as 100GBASE-SR10/LR4/ER4.
  • the clock module 420 of the embodiment of the present invention may include a phase locked loop PLL; a voltage controlled crystal oscillator VCXO (including a constant temperature voltage controlled oscillator OCXO, etc.) or a voltage controlled oscillator VCO. Further, an X frequency dividing circuit (optional) and a reference source selecting circuit (optional) may be included. Where X represents a value, such as a divide-by-2 circuit, the specific size needs to be determined according to the actual application.
  • the conversion device of the embodiment of the present invention may be placed in the REC and placed in the RE at the same time.
  • FIG. 5, FIG. 6A and FIG. 6B please refer to FIG. 5, FIG. 6A and FIG. 6B.
  • the reference clock of the clock module can be obtained by using one of 1PPS+T0D, IEEE 1588, synchronous Ethernet and local clock, where REC and RE are connected through the physical interface of Ethernet.
  • the reference clocks of the clock modules in the REC and RE are obtained using synchronous Ethernet, where REC and RE are connected by an Ethernet bearer network. In this way, the entire Ethernet bearer network supports the synchronous Ethernet function.
  • the reference clock of the clock module in the REC is obtained by using a local clock, and the REC generates a working clock as a clock reference source through the Ethernet physical layer interface to send a data stream to the physical layer interface;
  • the associated clock recovered in the data stream is used as a clock reference source and generates a working clock to forward the modified data stream;
  • the converting device performs clock synchronization according to the associated clock recovered from the received data stream of the Ethernet.
  • the REC and RE are connected via an Ethernet bearer network. In this way, the entire Ethernet bearer network supports synchronous Ethernet functions.
  • the conversion device of the embodiment of the present invention can be integrated into the REC and the RE device, and then can be directly connected or connected to the Ethernet bearer network.
  • both the RE and REC connected to the Ethernet contain a conversion device. If both sides are connected to the Ethernet, there are two conversion devices, such as RE1 in Figure 7.
  • the conversion device in the RE connected to the Ethernet has an Ethernet physical layer interface connected to the Ethernet.
  • the RE can also have multiple Ethernet physical layer interfaces connected to the Ethernet.
  • the conversion device in the REC connected to the Ethernet has two Ethernet physical layer interfaces and an Ethernet connection.
  • the REC may also have one or more Ethernet physical layer interfaces and an Ethernet connection.
  • the conversion device of the embodiment of the present invention is used as a single device, and the original REC and RE are connected to the device through the existing CPRI/OBSAI, and then Directly docked, or docked on an Ethernet bearer network.
  • the conversion device alone as one device and the conversion device can exist simultaneously in one scene in the RE/REC.
  • the conversion device connected to the Ethernet has two Ethernet physical layer interfaces connected to the Ethernet.
  • the conversion device can also have one or more Ethernet physical layer interfaces connected to the Ethernet.
  • REC and RE are only examples, and the embodiments of the present invention are not limited to REC and RE, but can be applied to devices that perform similar operations with REC and RE, such as RRU and BBU, SM (system module, system). Module), DU (Digital Unit, Data Unit), RU (Radio Unit, Wireless Unit), etc.
  • RRU and BBU system module, system. Module
  • DU Digital Unit, Data Unit
  • RU Radio Unit, Wireless Unit
  • the second conversion device of the embodiment of the present invention includes:
  • the data processor 920 is configured to convert the first data sent by the first device in the wireless base station system to the second device in the wireless base station system into a first Ethernet packet, and send the signal to the transmitter 910; a transmitter 910, configured to send the first Ethernet packet converted by the data processor 920 to the second device; and/or,
  • the receiver 930 is configured to receive a second Ethernet packet that is sent by the second device to the first device, and send the received second Ethernet packet to the data.
  • the processor 920 is configured to convert the received second Ethernet packet from the receiver 930 into the second data.
  • the data processor 920 is specifically configured to:
  • the data processor 920 encapsulates the first synchronization information of the one data segment and the one data segment into one first Ethernet packet;
  • the first synchronization information is used to indicate a location of the one data segment in the first data.
  • the data processor 920 is specifically configured to:
  • the data processor 920 is specifically configured to:
  • the second synchronization information is used to indicate a position of the corresponding data segment in the second data.
  • the device of the embodiment of the present invention may further include: a clock processor 940.
  • a clock processor 940 configured to perform clock synchronization by using the received clock reference source;
  • the time synchronization is performed by using the timestamp
  • the clock is synchronized according to the associated clock based on the associated clock recovered from the received data stream of the Ethernet.
  • the conversion device of the embodiment of the invention is REC or RE.
  • the spirit and scope of the invention are intended that the present invention cover the modifications and variations of the inventions

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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 appartient au domaine technique des communications sans fil et concerne en particulier un procédé, un système et un dispositif pour émettre des données, qui sont utilisés pour résoudre le problème de l'impossibilité, dans l'art antérieur, de réaliser une communication entre un REC et un RE dans un système de station de base sans fil qui utiliserait une ressource de mise en réseau d'émission existante, et donc d'économiser des ressources et de réduire les coûts dus à la limitation d'un protocole d'interface d'une interface entre le REC et le RE existants. Le procédé de la présente invention consiste à : convertir des premières données, qui sont envoyées à un deuxième dispositif d'un système de station de base sans fil par un premier dispositif du système de station de base sans fil, en un premier message Ethernet, envoyer le premier message Ethernet au deuxième dispositif; et/ou recevoir un deuxième message Ethernet obtenu par la conversion de deuxièmes données envoyées au premier dispositif par le deuxième dispositif, et la conversion du deuxième message Ethernet en ces deuxièmes données. La présente invention permet de réaliser la fusion d'un système de station de base sans fil et d'un protocole d'émission Ethernet.
PCT/CN2013/076944 2013-06-07 2013-06-07 Procédé et dispositif d'émission de données WO2014194517A1 (fr)

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PCT/CN2013/076944 WO2014194517A1 (fr) 2013-06-07 2013-06-07 Procédé et dispositif d'émission de données
CN2013800007752A CN103404226A (zh) 2013-06-07 2013-06-07 一种传输数据的方法及设备

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US10523791B2 (en) 2015-12-17 2019-12-31 Huawei Technologies Co., Ltd. Protocol conversion method and apparatus

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