WO2018153124A1 - 一种在分组设备上传送cpri接口的系统及方法 - Google Patents
一种在分组设备上传送cpri接口的系统及方法 Download PDFInfo
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- WO2018153124A1 WO2018153124A1 PCT/CN2017/109842 CN2017109842W WO2018153124A1 WO 2018153124 A1 WO2018153124 A1 WO 2018153124A1 CN 2017109842 W CN2017109842 W CN 2017109842W WO 2018153124 A1 WO2018153124 A1 WO 2018153124A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
- H04L45/502—Frame based
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/825—Involving tunnels, e.g. MPLS
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a system and method for transmitting a CPRI interface on a packet device.
- the packet transmission network PTN provides a unified transmission platform that is compatible with Ethernet, SDH, and PDH technologies, eliminating the diversity of network construction types and replacing them with interface types. Diversity.
- the PTN does not have the time slot switching transmission capability, so that the PTN cannot directly transmit the CPRI service of the common public radio interface, and the PTN cannot be applied in the wireless preamble network.
- the PTN application range is small, resulting in waste of resources.
- the present invention aims to provide a system and method for transmitting a CPRI interface on a packet device, so that the packet device can be applied to a wireless preamble network, and the networking capability and application of the packet device are expanded. range.
- the source end packet device platform is configured to convert the received CPRI optical signal into a CPRI electrical signal, cut the CPRI electrical signal into a fixed length CPRI data slice, and add an RTP fixed frame header and a control word to the CPRI data slice. Obtaining a CPRI packet; adding the MPLS/VLAN identifier to the CPRI packet, and packaging the packet into an Ethernet frame;
- the CPRI data is sliced and reconstructed to obtain a continuous CPRI electrical signal, and the CPRI electrical signal is sent to the corresponding user.
- the source packet device platform includes:
- a CPRI receiving module configured to convert a CPRI optical signal received by the source end packet device platform into a CPRI electrical signal, and extract the clock as a timing system reference source of the source end packet device platform;
- the CPRI slicing module is configured to cut a continuous CPRI electrical signal into a fixed length CPRI data slice according to the length required by the system, and add an RTP fixed frame header and a control word to the CPRI data slice to obtain a CPRI packet;
- An Ethernet frame sending module is configured to send the Ethernet frame to a sink device device platform.
- the sink-end packet device platform includes:
- An Ethernet frame receiving module configured to receive the Ethernet frame sent by the source packet device platform, and forward the Ethernet frame according to an MPLS/VLAN identifier
- the CPRI electrical signal recombination module is configured to restore CPRI data slices from the received Ethernet frames, perform recombination recovery in a synchronous mode or a differential timing mode to obtain continuous CPRI electrical signals, and pass the CPRI electrical signals through corresponding CPRI signal channels. Send to the appropriate user.
- the format of the Ethernet frame includes a source address, a destination address, a TPID label protocol identifier + VLAN, an Ethernet frame type, an Ethernet payload, and a frame check sequence, where the Ethernet The net payload consists of a CPRI data slice, an RTP fixed frame header, and a control word.
- the Ethernet frame type is composed of a label switching path or a PW Label Stack, a control word, an RTP fixed frame header, and a CPRI data slice.
- the format of the RTP fixed frame header includes:
- Version number V padding bit P, definition extension bit X, source count bit CC, identification bit M, packet sequence number, timestamp value Timestamp, and synchronization source SSRC.
- control word is composed of the following fields: an alarm indication bit, a remote defect indication bit, a reservation and segmentation bit, a length field, and an assignment packet sequence number.
- the sink-end packet device platform receives an Ethernet frame sent by the source-end packet device platform, and recovers a CPRI data slice from the Ethernet frame, performs recombination recovery to obtain a continuous CPRI electrical signal, and uses the CPRI electrical signal. Send to the appropriate user.
- the clock is extracted as a reference system reference source of the source end packet device platform.
- the synchronous mode or the differential timing mode is used for recombination recovery to obtain a continuous CPRI electrical signal.
- a system for transmitting a CPRI interface on a packet device in which a CPRI electrical signal is sliced into data slices into a CPRI packet in a source packet device platform, and After adding the identifier, the CPRI packet is encapsulated into an Ethernet frame; the CPRI data slice is restored from the Ethernet frame in the sink packet device platform, and the CPRI data slice is reconstructed and restored to obtain a continuous CPRI electrical signal, and according to MPLS/
- the VLAN identifier sends the CPRI electrical signal to the corresponding user, which expands the capability and application range of the PTN device and extends the life cycle of the PTN device.
- FIG. 3 is a schematic diagram of a format of a network frame in an embodiment of the present invention.
- FIG. 4 is a schematic diagram of a format of an RTP fixed frame header according to an embodiment of the present invention.
- the sink end packet device platform includes: an Ethernet frame receiving module, configured to receive an Ethernet frame sent by the source end packet device platform, and forward the Ethernet frame according to the MPLS/VLAN identifier; the CPRI electrical signal recombining module uses The CPRI data slice is restored from the received Ethernet frame, and the continuous CPRI electrical signal is obtained by performing recombination recovery in the synchronous mode or the differential timing mode.
- the format of the Ethernet frame includes a source address, a destination address, a TPID label protocol identifier/VLAN, an Ethernet frame type Ethertype, an Ethernet payload, and a frame check sequence FCS, where The Ethernet payload consists of a CPRI data slice, an RTP fixed frame header, and a control word.
- the Ethernet frame type in this embodiment is composed of a label switching path or a PW Label Stack, a control word, an RTP fixed frame header, and a CPRI data slice.
- the Ethernet frame type value is expressed in hexadecimal as 0x8847.
- the value of the TPID label protocol identifier is 0x8100 in hexadecimal notation;
- the VLAN value corresponds to the label number of the label switching path or the PW Label Stack;
- the label switching path value is expressed in hexadecimal, and each label switching path or The channel number of the PW Label Stack corresponds to the CPRI signal channel.
- the control word is composed of a field of an alarm indication bit L bit, a remote defect indication bit R bit, a reserved RSV and a segmentation FRG, a length field Length, and an assignment packet sequence number.
- the alarm indication bit L bit, the L bit is set to “1”, indicating that the Ethernet payload in the CPRI packet is invalid, and when the peer receives the CPRI packet with the L bit “1”, the full TDM port is sent to the corresponding TDM port.
- R bit L bit set to "1" indicates remote end reporting loss
- reserved RSV and segmented FRG sender must be set to 0, the receiver must ignore this bit
- length field Length If it is not 0, it indicates the length of the frame header; if the RTP frame header is used, the length of the RTP frame header and the length of the payload are added, and if the total length is less than or equal to 64 bytes, the length field must be set. It is the actual value, otherwise it is set to 0; the assignment packet sequence number is incremented every time a CPRI packet is sent from 0 to 0xFFFF, and the peer can detect whether the packet is lost and reorder the received packet.
- the source end packet device platform converts the received CPRI optical signal into a CPRI electrical signal; cuts the CPRI electrical signal into a fixed length CPRI data slice according to system requirements, and adds an RTP fixed frame header and control to the CPRI data slice. Word, get the CPRI packet; add the MPLS/VLAN identifier to the CPRI packet and encapsulate it into an Ethernet frame;
- the CPRI receiving module converts the CPRI optical signal received by the source grouping device platform into a CPRI electrical signal, and extracts the clock as a reference system reference source of the source end packet device platform;
- the CPRI slicing module cuts the continuous CPRI electrical signal into a fixed length CPRI data slice according to the length required by the system, and adds an RTP fixed frame header and a control word to the CPRI data slice to obtain a CPRI packet;
- the Ethernet frame encapsulation module adds an MPLS/VLAN identifier to the CPRI packet, and encapsulates the packet into an Ethernet frame.
- the Ethernet frame sending module sends the Ethernet frame encapsulated by the Ethernet frame encapsulation module to the Ethernet frame receiving module.
- the sending mode of the Ethernet frame is unicast, multicast, and broadcast, and the manner of forwarding the Ethernet frame. The choice is determined by the destination address;
- the sink-end packet device platform receives the Ethernet frame sent by the source-end packet device platform, and restores the CPRI data slice from the Ethernet frame, performs recombination recovery to obtain a continuous CPRI electrical signal, and sends the CPRI electrical signal to the corresponding user;
- the Ethernet frame receiving module receives the Ethernet frame sent by the source packet device platform, and forwards the Ethernet frame according to the MPLS/VLAN identifier.
- the CPRI electrical signal recombination module restores the CPRI data slice from the received Ethernet frame, and performs reorganization and recovery according to the timing system reference source using the synchronous mode or the differential timing mode.
- the continuous CPRI electrical signal is obtained and the CPRI electrical signal is sent to the corresponding user.
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Abstract
本发明公开了一种在分组设备上传送CPRI接口的系统及方法,该系统包括:源端分组设备平台,用于将接收到的CPRI光信号转化为CPRI电信号,将CPRI电信号切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;宿端分组设备平台,用于从接收到的所述以太网帧中还原出CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将所述CPRI电信号发送给相应的用户。本发明使得分组设备能应用于无线前传网络中,扩大了分组设备的组网能力和应用范围。
Description
本发明涉及通信技术领域,具体涉及一种在分组设备上传送CPRI接口的系统及方法。
数据传输平台大多是分组传送设备,分组传送网PTN提供了一个性能更优,兼容以太网、SDH、PDH各种技术统一的传送平台,消除了网络建设类型的多样性,代之以接口类型的多样性。但是PTN不具备时隙交换传送能力,使得PTN无法直接传送通用公共无线电接口CPRI业务,导致PTN不能在无线前传网络中应用,PTN应用范围较小,造成资源浪费。
发明内容
针对现有技术中存在的缺陷,本发明的目的在于提供一种在分组设备上传送CPRI接口的系统及方法,使得分组设备能应用于无线前传网络中,扩大了分组设备的组网能力和应用范围。
为达到以上目的,本发明采取的技术方案是:
一种在分组设备上传送CPRI接口的系统,包括:
源端分组设备平台,用于将接收到的CPRI光信号转化为CPRI电信号,将CPRI电信号切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;
宿端分组设备平台,用于从接收到的所述以太网帧中还原出
CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将所述CPRI电信号发送给相应的用户。
在上述技术方案的基础上,所述源端分组设备平台包括:
CPRI接收模块,用于将源端分组设备平台接收的CPRI光信号转化为CPRI电信号,并提取时钟作为源端分组设备平台的定时系统参考源;
CPRI切片模块,用于将连续的CPRI电信号按照系统要求的长度切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;
以太网帧封装模块,用于将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;
以太网帧发送模块,用于将所述以太网帧发送给宿端分组设备平台。
在上述技术方案的基础上,所述宿端分组设备平台包括:
以太网帧接收模块,用于接收所述源端分组设备平台发送的所述以太网帧,并根据MPLS/VLAN标识将所述以太网帧进行相应的转发;
CPRI电信号重组模块,用于从接收到的以太网帧中还原出CPRI数据切片,采用同步模式或差分定时模式进行重组恢复得到连续的CPRI电信号,并将CPRI电信号通过相应的CPRI信号通道发送给相应的用户。
在上述技术方案的基础上,所述以太网帧的格式包括源地址、目的地址、TPID标签协议识别符+VLAN、以太网帧类型、以太网净荷和帧校验序列,其中,所述以太网净荷由CPRI数据切片、RTP固定帧头和控制字组成。
在上述技术方案的基础上,以太网帧类型由标签交换路径或PW Label Stack、控制字、RTP固定帧头和CPRI数据切片组成。
在上述技术方案的基础上,所述RTP固定帧头的格式包括:
版本号V、填充比特P、定义扩展比特X、作用源计数比特CC、标识比特M、包序号Sequence Number、时间戳值Timestamp和同步源SSRC。
在上述技术方案的基础上,所述控制字由以下字段组成:告警指示比特、远端缺陷指示比特、预留和分段比特、长度字段和赋值包序号。
一种分组设备上传CPRI接口的方法,具体步骤如下:
S1,源端分组设备平台将接收到的CPRI光信号转化为CPRI电信号,将CPRI电信号切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包,将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;
S2,宿端分组设备平台接收源端分组设备平台发送的以太网帧,并从所述以太网帧中还原出CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将所述CPRI电信号发送给相应的用户。
在上述技术方案的基础上,所述S1中,提取时钟作为源端分组设备平台的定时系统参考源。
在上述技术方案的基础上,所述S2中:
根据定时系统参考源采用同步模式或差分定时模式进行重组恢复得到连续的CPRI电信号。
与现有技术相比,本发明的优点在于:
本发明的一种在分组设备上传送CPRI接口的系统,在源端分组设备平台中将CPRI电信号切成数据切片组成CPRI分组包,并将
CPRI分组包添加上标识后,封装成以太网帧;在宿端分组设备平台中从以太网帧还原出CPRI数据切片,并对CPRI数据切片进行重组恢复得到连续的CPRI电信号,并根据MPLS/VLAN标识将CPRI电信号发送给相应的用户,扩大了PTN设备的能力和应用范围,延长了PTN设备的生命周期。
图1为本发明的系统框图;
图2为本发明的方法流程图;
图3为本发明实施例中太网帧格式的示意图;
图4为本发明实施例中RTP固定帧头格式的示意图;
图5为本发明实施例中控制字格式的示意图。
以下结合附图及实施例对本发明作进一步详细说明。
参见图1所示,本发明实施例提供一种在分组设备上传送CPRI接口的系统,包括,源端分组设备平台和以太网帧发送模块,源端分组设备平台包括:CPRI接收模块,用于将源端分组设备平台接收的CPRI光信号转化为CPRI电信号,并提取时钟作为源端分组设备平台的定时系统参考源;CPRI切片模块,用于将连续的CPRI电信号切成固定长度的CPRI数据切片,本实施例中根据CPRI option等级将CPRI电信号切成的固定长度是N*64字节,如CPRI option1/CPRI option2对应N=1,即固定长度为64字节的CPRI数据切片;对于CPRI option3/CPRI option4,对应N=2,即固定长度为128字节的CPRI数据切片;对于CPRI option5以上速率,对应N=4,即固定长度为256字节的CPRI数据切片,在CPRI数据切片上加上RTP固定帧头
和控制字,得到CPRI分组包;以太网帧封装模块,用于将CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;以太网帧发送模块,用于将以太网帧发送给宿端分组设备平台。宿端分组设备平台,用于从接收到的以太网帧中还原出CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将CPRI电信号通过相应的CPRI信号通道给相应的用户。
其中,宿端分组设备平台包括:以太网帧接收模块,用于接收源端分组设备平台发送的以太网帧,并根据MPLS/VLAN标识将以太网帧进行相应转发;CPRI电信号重组模块,用于从接收到的以太网帧中还原出CPRI数据切片,采用同步模式或差分定时模式进行重组恢复得到连续的CPRI电信号。
参见表1所示,本实施例中,以太网帧的格式包括源地址、目的地址、TPID标签协议识别符/VLAN、以太网帧类型Ethertype、以太网净荷和帧校验序列FCS,其中,以太网净荷由CPRI数据切片、RTP固定帧头和控制字组成。
参见图3所示,本实施例中以太网帧类型由标签交换路径或PW Label Stack、控制字、RTP固定帧头和CPRI数据切片组成。以太网帧类型值采用16进制表示为0x8847。其中,TPID标签协议识别符值采用16进制表示为0x8100;VLAN值和标签交换路径或PW Label Stack的通道号一一对应;标签交换路径值采用16进制表示,并且每个标签交换路径或PW Label Stack的通道号和CPRI信号通道一一对应。
表1:以太网帧的格式
参见图4所示,本实施例中,RTP固定帧头的格式包括版本号V、填充比特P、定义扩展比特X、作用源计数比特CC、标识比特M、包序号Sequence Numbe、时间戳值Timestamp和同步源SSRC,其中版本号V,必须设置为2;填充比特P,发送者必须设为0,接受者必须忽略此比特;定义扩展比特X,发送者必须设为0,接受者必须忽略此比特;作用源计数比特CC,发送者必须设为0,接受者必须忽略此比特;标识比特M,发送者必须设为0,接受者必须忽略此比特;包序号Sequence Number,每发送一个CPRI分组包包序号从0至0xFFFF的循环递增,对端以此检测是否丢包以及对收到的CPRI分组包重新排序,该包序号的值与控制字中的赋值包序号的值相同;时间戳值Timestamp,用于承载定时信息;同步源SSRC,用于检测错误连接。
参见图5所示,本实施例中,控制字由告警指示比特L bit、远端缺陷指示比特R bit、预留RSV和分段FRG、长度字段Length和赋值包序号Sequence Number的字段组成。其中,告警指示比特L bit,L bit置“1”表示CPRI分组包中的以太网净荷无效,对接端收到L bit为“1”的CPRI分组包时,会向相应的TDM端口发送全“1”;远端缺陷指示比特R bit,L bit置“1”表示远端收报丢失;预留RSV和分段FRG,发送者必须设为0,接受者必须忽略此比特;长度字段Length,如果不是0,则指示了帧头的长度;如果使用了RTP帧头则再加上该RTP帧头长度和载荷的长度,且若该长度总值小于或等于64字节时,长度字段必须设为实际值,否则设为0;赋值包序号Sequence Number,每发送一个CPRI分组包从0到0xFFFF循环递增,对端可依此检测是否丢包以及对收到的包重新排序。
参见图2,本实施例提供一种在分组设备上传送CPRI接口的方
法,具体步骤如下:
S1,源端分组设备平台将接收到的CPRI光信号转化为CPRI电信号;按照系统要求将CPRI电信号切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;将CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;
其中,S1的具体步骤如下:
S10,CPRI接收模块,将源端分组设备平台接收的CPRI光信号转化为CPRI电信号,并提取时钟作为源端分组设备平台的定时系统参考源;
S11,CPRI切片模块将连续的CPRI电信号按照系统要求的长度切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;
S12,以太网帧封装模块将CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;
S13,以太网帧发送模块将以太网帧封装模块封装的以太网帧发送给以太网帧接收模块;其中,以太网帧的发送方式为单播、组播和广播,且以太网帧的转发方式的选择由目的地址决定;
S2,宿端分组设备平台接收源端分组设备平台发送的以太网帧,并从以太网帧中还原出CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将CPRI电信号发送给相应的用户;
其中,S2的具体步骤如下:
S20,以太网帧接收模块,接收源端分组设备平台发送的以太网帧,并根据MPLS/VLAN标识将以太网帧进行相应转发;
CPRI电信号重组模块从接收到的以太网帧中还原出CPRI数据切片,根据定时系统参考源采用同步模式或差分定时模式进行重组恢
复得到连续的CPRI电信号,并将CPRI电信号发送给相应的用户。
通过源端分组设备平台将CPRI电信号切成数据切片组成CPRI分组包,并将CPRI分组包添加上标识后,封装成以太网帧;宿端分组设备平台还原出CPRI数据切片,并对CPRI数据切片进行重组恢复得到连续的CPRI电信号发送给相应的用户,通过此种方式将CPRI业务可以应用到无线前传网络,扩大了PTN设备的能力和应用范围,延长了PTN设备的生命周期。
本发明不局限于上述实施方式,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。
Claims (10)
- 一种在分组设备上传送CPRI接口的系统,其特征在于,包括:源端分组设备平台,用于将接收到的CPRI光信号转化为CPRI电信号,将CPRI电信号切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;宿端分组设备平台,用于从接收到的所述以太网帧中还原出CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将所述CPRI电信号发送给相应的用户。
- 如权利要求1所述的一种在分组设备上传送CPRI接口的系统,其特征在于,所述源端分组设备平台包括:CPRI接收模块,用于将源端分组设备平台接收的CPRI光信号转化为CPRI电信号,并提取时钟作为源端分组设备平台的定时系统参考源;CPRI切片模块,用于将连续的CPRI电信号按照系统要求的长度切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包;以太网帧封装模块,用于将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;以太网帧发送模块,用于将所述以太网帧发送给宿端分组设备平台。
- 如权利要求1所述的一种在分组设备上传送CPRI接口的系统,其特征在于,所述宿端分组设备平台包括:以太网帧接收模块,用于接收所述源端分组设备平台发送的所述 以太网帧,并根据MPLS/VLAN标识将所述以太网帧进行相应的转发;CPRI电信号重组模块,用于从接收到的以太网帧中还原出CPRI数据切片,采用同步模式或差分定时模式进行重组恢复得到连续的CPRI电信号,并将CPRI电信号通过相应的CPRI信号通道发送给相应的用户。
- 如权利要求1所述的一种在分组设备上传送CPRI接口的系统,其特征在于:所述以太网帧的格式包括源地址、目的地址、TPID标签协议识别符+VLAN、以太网帧类型、以太网净荷和帧校验序列,其中,所述以太网净荷由CPRI数据切片、RTP固定帧头和控制字组成。
- 如权利要求4所述的一种在分组设备上传送CPRI接口的系统,其特征在于:以太网帧类型由标签交换路径或PW Label Stack、控制字、RTP固定帧头和CPRI数据切片组成。
- 如权利要求1所述的一种在分组设备上传送CPRI接口的系统,其特征在于,所述RTP固定帧头的格式包括:版本号V、填充比特P、定义扩展比特X、作用源计数比特CC、标识比特M、包序号Sequence Number、时间戳值Timestamp和同步源SSRC。
- 如权利要求1所述的一种在分组设备上传送CPRI接口的系统,其特征在于,所述控制字由以下字段组成:告警指示比特、远端缺陷指示比特、预留和分段比特、长度字段和赋值包序号。
- 一种分组设备上传CPRI接口的方法,其特征在于,具体步骤如下:S1,源端分组设备平台将接收到的CPRI光信号转化为CPRI电 信号,将CPRI电信号切成固定长度的CPRI数据切片,并在CPRI数据切片上加上RTP固定帧头和控制字,得到CPRI分组包,将所述CPRI分组包添加MPLS/VLAN标识,封装成以太网帧;S2,宿端分组设备平台接收源端分组设备平台发送的以太网帧,并从所述以太网帧中还原出CPRI数据切片,进行重组恢复得到连续的CPRI电信号,并将所述CPRI电信号发送给相应的用户。
- 如权利要求8所述的一种在分组设备上传送CPRI接口的方法,其特征在于:所述S1中,提取时钟作为源端分组设备平台的定时系统参考源。
- 如权利要求9所述的一种在分组设备上传送CPRI接口的方法,其特征在于,所述S2中:根据定时系统参考源采用同步模式或差分定时模式进行重组恢复得到连续的CPRI电信号。
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