WO2012009926A1 - 一种cpri链路误码监测方法、系统和装置 - Google Patents

一种cpri链路误码监测方法、系统和装置 Download PDF

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Publication number
WO2012009926A1
WO2012009926A1 PCT/CN2010/079821 CN2010079821W WO2012009926A1 WO 2012009926 A1 WO2012009926 A1 WO 2012009926A1 CN 2010079821 W CN2010079821 W CN 2010079821W WO 2012009926 A1 WO2012009926 A1 WO 2012009926A1
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Prior art keywords
frame
fcs
cpri
error
module
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PCT/CN2010/079821
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English (en)
French (fr)
Inventor
张攀科
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10854956.9A priority Critical patent/EP2597807B1/en
Priority to JP2013519936A priority patent/JP5719438B2/ja
Priority to US13/576,026 priority patent/US8510627B2/en
Publication of WO2012009926A1 publication Critical patent/WO2012009926A1/zh

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • G06F11/07Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0061Error detection codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/24Testing correct operation

Definitions

  • the present invention relates to a communication technology, or a CPRI (Common Public Radio Interface) link error detection method, system, and device. . BACKGROUND OF THE INVENTION
  • a new type of base station gradually separates a base station unit (BBU) and a radio remote unit (RRU) of a conventional base station. Fiber or cable to connect.
  • BBU base station unit
  • RRU radio remote unit
  • some baseband radio frequency interface standards have emerged, among which the general public radio interface CPRI is a baseband radio interface standard widely used in base station equipment in the field of wireless communications.
  • BBUs and RRUs are connected by fiber or cable media, and the data rate is high, usually reaching several Gbps, such a high data rate places very high demands on the stability of the physical layer.
  • the existing implementation method usually adds a pseudo-random sequence generation and a calibration module to the BBU and the RRU, and performs error detection on the CPRI downlink and uplink channels respectively.
  • the drawbacks of this solution are: The need to interrupt the business to measure. And the measurement of the error is usually to test the longer time to average the number of errors, so the prior art test method is only suitable for allowing the service to be interrupted for a long time.
  • a CPRI link error monitoring method including:
  • the data to be sent by the CPRI link data transmitting end is framing and output, and the frame check sequence FCS of each frame is calculated, wherein, in the framing, the CPRI link data transmitting end adds the FCS of the previous frame to In the FCS field of the current frame;
  • the data receiving end of the CPRI link performs frame splitting on the received frame data to obtain the FCS of the previous frame carried in the current frame, and calculates the FCS of the current frame by calculating the received frame data, and buffers the current frame.
  • the FCS of the previous frame is compared with the buffered FCS of the previous frame. If the comparison result is inconsistent, it is determined that the CPRI link has an error.
  • the CPRI link data transmitting end and the CPRI link data receiving end acquire the FCS of the frame data by using a cyclic redundancy check CRC operation.
  • the above FCS field defines a user-defined area in the CPRI control word.
  • Each FCS control word defined in the above FCS field is 8 bits in length.
  • a general public radio interface CPRI link error monitoring system including: a CPRI link data transmitting apparatus, including:
  • the CPRI framing module is configured to process the data frame to be sent and output the framing frame; wherein, in the framing, the CPRI framing module adds the FCS of the previous frame sent by the frame check sequence acquiring module to the FCS of the current frame.
  • a frame check sequence obtaining module configured to receive frame data output by the CPRI framing module, calculate a frame check sequence FCS of each frame, and send the FCS to the CPRI framing module;
  • the CPRI link data receiving device includes: The CPRI detaching frame module is configured to perform frame splitting on the frame data output by the CPRI framing module, obtain the FCS of the previous frame carried in the current frame, and send the FCS to the error monitoring module; the error monitoring module uses Calculating the frame data sent by the CPRI framing module to obtain the FCS post buffer of the current frame itself, and comparing the FCS of the previous frame sent by the CPRI detach frame module with the FCS of the previous frame of the buffer, if the comparison result is inconsistent Then, it is determined that the CPRI link has an error.
  • the error monitoring module is further configured to: when the pre-configured superframe timer T2 expires, if the previous frame check is that an error occurs and the pre-configured error statistics counter is not full, the error statistics counter is incremented by one; When the pre-configured error statistics timer T1 expires, it is determined whether the error statistics counter reaches a preset threshold, and if so, an upper alarm; wherein, T1>T2.
  • the error monitoring module is further configured to: after the error statistics timer T1 expires, cache the result of the error statistics counter and clear it.
  • a general public radio interface CPRI link error monitoring apparatus including: a CPRI framing module, configured to process a data frame to be transmitted and output the image; wherein, when framing The CPRI framing module adds the FCS of the previous frame sent by the frame check sequence acquisition module to the FCS field of the current frame; the frame check sequence acquisition module is configured to receive the frame data output by the CPRI framing module, and operate Obtaining a frame check sequence FCS for each frame, and transmitting the FCS to the CPRI framing module; the CPRI detaching frame module is configured to perform frame splitting on the frame data sent by the data sending end of the CPRI link, and obtain the frame carried in the current frame.
  • the FCS of the previous frame is sent to the error monitoring module; the error monitoring module is configured to calculate the frame data sent by the data transmitting end of the CPRI link to obtain the FCS post buffer of the current frame itself, and to disassemble the CPRI.
  • the FCS of the previous frame sent by the frame module is compared with the FCS of the previous frame buffered. If the comparison result is inconsistent, it is determined that the CPRI link has an error.
  • the error code monitoring module is further configured to: when the pre-configured superframe timer T2 arrives, if the previous frame check is an error and the pre-configured error statistics counter is not full, the error statistics counter is incremented by one; When the pre-configured error statistics timer T1 expires, it is determined whether the error statistics counter reaches a preset threshold, and if so, an upper alarm; wherein, T1>T2.
  • the error monitoring module is further configured to: after the error statistics timer T1 expires, cache the result of the error statistics counter and clear it.
  • FIG. 1 is a schematic diagram of a definition of an FCS field in a CPRI control word in a method provided by the present invention
  • FIG. 2 is a flowchart of a CPRI link error monitoring method provided by the present invention
  • FIG. 3 is a CPRI link error monitoring provided by the present invention.
  • FIG. 4 is a schematic diagram of processing of frame data in the data transmission direction provided by the present invention
  • Figure 5 is a schematic diagram of processing of frame data in the data receiving direction provided by the present invention
  • Figure 6 is a schematic diagram of error warning and error provided by the present invention
  • FIG. 7 is a structural diagram of a CPRI link error monitoring apparatus provided by the present invention.
  • the present invention provides a CPRI link error monitoring method, system and device.
  • the method provided by the present invention needs to define an FCS field (Frame Check Sequence) as a transmission carrier and a judgment criterion for error monitoring before performing error detection.
  • the FCS field may be preferably defined in a section of the user sub-defined area reserved in the CPRI standard control word part, and one or several fields are selected from the CPRI link error check field FCS, and the following is selected.
  • the fields are described as an example: Four fields are selected from the user-defined area, defined as the CPRI link error check field FCS, and the corresponding basic frame numbers are: M, M+64, M+128, M +192, where M (less than 64) is a selected user-defined field.
  • the selection of the basic frame number is only a preferred method, and the present invention is not limited to this selection method.
  • the four control words use only the lower 8 bits thereof to form a 32-bit FCS field. As shown in FIG. 1, the FCS field in the present invention is in the CPRI.
  • FCS_0, FCS 1 , FCS 2, FCS 3 are all the lower 8 bits of the control word.
  • FCS_0 represents the bit 7 ⁇ 0 of the FCS.
  • FCS_l indicates bits 15 to 8 of the FCS, FCS_2 indicates bits 23 to 16 of the FCS, and FCS 3 indicates bits 31 to 24 of the FCS.
  • P is the starting position of the defined fast (fast) C&M, and the selected M value should satisfy 16 ⁇ M ⁇ P.
  • control word length is 8 bits; when the CPRI link rate is 1.2288 Gbps, the control word length is 16 bits; CPRI link When the rate is 2.4576 Gbps, the control word length is 32 bits; when the CPRI link rate is 3.072 Gbps, the control word length is 40 bits; when the CPRI link rate is 4.9152 Gbps, the control word length is 64 bits; when the CPRI link rate is 6.144 Gbps The control word length is 80 bits. When the CPRI link rate is 9.8304 Gbps, the control word length is 128 bits.
  • the selected control word length is preferably defined as 8 bits in the present invention.
  • the basic principle of the method provided by the present invention is: adding a CRC (Cyclic Redundancy Check) to generate a function module on the transmitting end of the CPRI link, and the system agrees to the CPRI transmitting end and The receiving end uses a uniform CRC generator polynomial.
  • the CRC generation function module performs CRC operation on all data in the CPRI-superframe according to the frame timing reference of the CPRI, buffers the obtained CRC result, and fills in the FCS field position of a superframe under the CPRI.
  • a CRC check function module is added, and the CRC polynomial agreed by the system is used.
  • the CRC check function module performs CRC operation on all data in the CPRI-superframe according to the frame timing reference of the CPRI, and buffers the obtained CRC result, and positions the FCS field of the superframe and the received CRC field in the CPRI. The contents are compared. If they are identical, the check-safe is correct. Otherwise, it is judged to be a bit error.
  • the FCS for obtaining frame data by using the CRC operation in the present invention is only a preferred implementation manner of the present invention, and the manner of realizing FCS for acquiring frame data is within the protection scope of the present invention.
  • the CPRI link error monitoring method includes the following steps: Step S201: The data to be sent by the CPRI link data transmitting end is framing and output, and uses CRC operation. Obtaining a frame check sequence FCS for each frame; wherein, in the framing, the CPRI link data transmitting end adds the FCS of the previous frame to the FCS field of the current frame; Step S202, the CPRI link data receiving end receives the The frame data is deframed to obtain the FCS of the previous frame carried in the current frame, and the CRC operation is performed on the received frame data to obtain the FCS of the current frame itself and cached; Step S203: The CPRI link data receiving end carries the current frame The FCS of the previous frame is compared with the buffered FCS of the previous frame.
  • the CPRI link data receiving end may further configure two timers and a counter for realizing early warning of error. Specifically, when the pre-configured superframe timer T2 expires, the CPRI link data receiving end adds one to the error statistics counter if the previous frame check is that an error occurs and the pre-configured error statistics counter is not full; And when the pre-configured error statistics timer T1 expires, it is determined whether the error statistics counter reaches a preset threshold, and if so, an upper layer alarm; wherein, T1>T2.
  • the CPRI link data receiving end may further buffer the result of the error statistics counter statistics and clear it.
  • the present invention also provides a CPRI link error monitoring system. As shown in FIG. 3, the system includes a CPRI link data transmitting device 32 and a CPRI link data receiving device 34, and a PRI link data transmitting device 32 and a CPRI chain.
  • the data receiving device 34 is connected by an optical fiber or a cable. Specifically, as shown in FIG.
  • the CPRI link data transmitting device 32 includes: a CPRI framing module 322, configured to output the received data to a frame and output the data to a serial/serial-serial conversion (SERDES) module 326 and a frame check sequence acquisition module 324; wherein, in the data framing, the previous frame sent by the frame check sequence acquisition module 324 The FCS is added to the FCS field of the current frame; the frame check sequence obtaining module 324 is configured to perform a CRC operation on the received frame data, and send the calculated FCS of each frame to the CPRI framing module 322;
  • SERDES serial/serial-serial conversion
  • the SERDES module 326 is configured to transmit the received frame data to the CPRI link data receiving device 34.
  • the CPRI link data receiving device 34 includes:
  • the SERDES module 346 is configured to receive frame data, and send the frame data to the CPRI detaching module 342 and the error monitoring module 344;
  • the CPRI frame splitting module 342 is configured to perform frame splitting processing on the received frame data, extract the FCS of the previous frame carried in the current frame, and send the FCS to the error monitoring module 344, and the data after the frame is removed.
  • the error detection module 344 is configured to perform CRC operation on the received frame data, calculate a FCS post buffer of the current frame, and send the FCS of the previous frame and the buffered previous frame sent by the CPRI frame splitting module. The FCS is compared. If the comparison result is inconsistent, it is determined that the CPRI link has an error.
  • the CRC operation can perform a CRC operation by using a CRC operator;
  • the CRC operator is one of the following operators but is not limited to the following types: CRC8, CRC10, CRC 16, CRC32 or CRC64 operator .
  • the CRC32 operator is used to implement, and when the CRC32 operator is used for calculation, the polynomial used in the operation is:
  • FIG. 4 it is a schematic diagram of a data frame processing procedure in a sending direction provided by the present invention.
  • the CPRI superframe numbers shown in the figure are two frames of data of N and N+1, respectively, and all data of the superframe N is sent to the frame.
  • the sequence acquisition module performs the CRC32 operation, and the 32-bit operation result FCS(N) bit 7 ⁇ 0 is FCS_0(N), bitl5 ⁇ 8 is FCS_l(N), bit23 ⁇ 16 is FCS_2(N), bit31 ⁇ 24 is FCS_3 (N) ⁇ 8 bits of the control words of the basic frame numbers M, M+64, M+128, and M+192 of the superframe N+1 are respectively filled.
  • FIG. 5 it is a schematic diagram of a data frame processing process in a receiving direction provided by the present invention.
  • the CPRI superframe numbers shown in the figure are two frames of data of N and N+1, respectively, and all data of the superframe N is sent to the error code.
  • the monitoring module performs a CRC32 operation, and its 32-bit operation result FCS(N) is buffered.
  • FCS_0(N), FCS_1(N), FCS_2(N), and FCS_3(N) are respectively parsed from the superframe N+1 and combined to obtain the CRC32 result of the received superframe N.
  • the result is compared with the FCS(N) of the superframe N calculated and buffered by the module, and the same is considered correct, otherwise the error is considered and the error occurs.
  • the error monitoring module 344 may further be disposed with an error statistics period timer T1, a CPRI superframe period timer T2, and an error statistics counter Err_cnt (not shown).
  • T1 is much larger than T2.
  • Step S601 The error monitoring module 344 detects whether the superframe period timer T2 is detected.
  • Step S602 the error monitoring module 344 detects whether the error statistics counter Err_cnt is not full and the previous frame check error occurs, and if yes, execute step S603; otherwise, execute Step S604; Step S603, adding one error statistics counter Err_cnt to step S601; Step S604, keeping the error statistics counter Err_cnt unchanged, returning to step S601; Step S605, error detection module 344 detecting error statistics cycle timer If T1 is up, if yes, go to step S606; otherwise, go back to step S601; step S606, check whether the error statistics counter Err_cnt reaches the maximum value ErrMax, and if so, go to step S607; otherwise, go to step S608; Step S607, the error monitoring module outputs an alarm (Alarm) for warning, and performs step S608; Step S608, the error monitoring module buffers Err_cnt to the previous statistical
  • the present invention further provides a CPRI link error monitoring device. As shown in FIG. 7, the device may be deployed on a CPRI link data transmitting end or deployed on a CPRI link data receiving end, that is, the device is a device. Data transceiver. Specifically, the device includes:
  • the CPRI framing module 70 is configured to process the framing of the data to be sent and output the framing; wherein, in the framing, the CPRI framing module 70 adds the FCS of the previous frame sent by the frame check sequence obtaining module 72 to the current frame.
  • the frame check sequence obtaining module 72 is configured to perform a CRC operation on the frame data output by the CPRI framing module 70 to obtain a frame check sequence FCS of each frame, and send the FCS to the CPRI framing module 70;
  • the CPRI framing module 74 is configured to perform frame splitting on the frame data sent by the data sending end of the CPRI link, and obtain the FCS backward error error monitoring module 76 of the previous frame carried in the current frame.
  • the error monitoring module 76 uses Performing a CRC operation on the frame data sent by the data transmission end of the CPRI link to obtain a FCS post buffer of the current frame itself, and comparing the FCS of the previous frame sent by the CPRI frame splitting module with the FCS of the previous frame of the buffer, if the comparison result Inconsistent, it is determined that there is a bit error on the CPRI link.
  • the error monitoring module 76 is further configured to: when the pre-configured superframe timer T2 expires, if the previous frame is faulty and the pre-configured error statistics counter is not full, The error statistics counter is incremented by one; when the pre-configured error statistics timer T1 expires, it is determined whether the error statistics counter reaches a preset threshold, and if so, an upper alarm; wherein, T1>T2.
  • the error monitoring module 76 is further configured to: after the error statistics timer T1 expires, cache the result of the error statistics counter and clear it.
  • the device also has a SERDES module 78 for an interface for data transceiving.
  • the present invention can monitor the error condition of the CPRI link without affecting the normal operation of the service; and, in the case of the service operation, A small number of errors may not significantly affect the service.
  • the method provided by the present invention proposes a 4 error rate and provides an early warning function when the bit error rate is high, and the stability of the device is maintained. It provides an effective means and can also be used as a quantitative basis for the evaluation of CPRI link stability.
  • the present invention is compatible with all rate interfaces defined by the CPRI standard by defining the length of the FCS control word. It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention.

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Abstract

本发明公开了一种通用公共无线接口CPRI链路误码监测方法、系统和装置,上述方法包括:CPRI链路数据发送端对待发送的数据进行组帧后输出,并运算得到每帧的帧校验序列FCS;其中,在组帧时,上述CPRI链路数据发送端将上一帧的FCS添加到当前帧的FCS字段中;CPRI链路数据接收端对接收到的帧数据进行拆帧得到当前帧中携带的上一帧的FCS、对接收到的帧数据进行运算得到当前帧自身的FCS并缓存,将当前帧中携带的上一帧的FCS与缓存的上一帧的FCS进行比较,若比较结果不一致,则判定CPRI链路出现误码。通过本发明提供的技术方案,能够在不影响业务正常工作的情况下对CPRI链路的误码情况进行监测。

Description

一种 CPRI ^^误码监测方法、 系统和装置 技术领域 本发明涉及通信技术领 i或, 尤其涉及一种 CPRI ( Common Public Radio Interface, 通用公共无线接口) 链路误码监测方法、 系统和装置。 背景技术 近年来, 随着无线通信技术的发展, 新式基站逐渐将传统基站的基带单 元( Building Base band Unit, 简称为 BBU )和射频单元( Radio Remote Unit, 简称为 RRU )分离, 二者釆用光纤或线缆进行连接。 与此同时出现了一些基 带射频接口标准, 其中通用公共无线接口 CPRI是无线通信领域广泛应用于 基站设备的一种基带射频接口标准。 由于 BBU和 RRU釆用光纤或线缆介质进行连接, 且数据速率艮高, 通 常达到数 Gbps, 如此高的数据速率对物理层的稳定性提出了非常高的要求。 为了评估 CPRI链路的性能, 需要对其误码率进行监测。 现有的实现方法通常是在 BBU和 RRU上增加伪随机序列产生和校 -险模 块, 分别对 CPRI下行和上行通道进行误码监测。 这种方案的缺陷在于: 需 要中断业务才能测量。 并且对于误码的测量通常是要测试较长的时间对误码 数进行平均才有意义, 因此现有技术中的测试方法只适合于在允许业务长时 间中断的情况下进行。 发明内容 本发明提供了一种 CPRI链路误码监测方法、 系统和装置, 用以解决现 有技术中存在的对于误码的监测只能在中断业务情况下进行的问题。 根据本发明的一个方面, 提供了一种 CPRI链路误码监测方法, 包括:
CPRI链路数据发送端对待发送的数据进行组帧后输出,并运算得到每帧 的帧校验序列 FCS; 其中, 在组帧时, 上述 CPRI链路数据发送端将上一帧 的 FCS添加到当前帧的 FCS字段中; CPRI链路数据接收端对接收到的帧数据进行拆帧得到当前帧中携带的 上一帧的 FCS、 对接收到的帧数据进行运算得到当前帧自身的 FCS并緩存, 将当前帧中携带的上一帧的 FCS与緩存的上一帧的 FCS进行比较, 若比较 结果不一致, 则判定 CPRI链路出现误码。 其中,上述 CPRI链路数据发送端和 CPRI链路数据接收端利用循环冗余 校验 CRC运算获取帧数据的 FCS。 上述 FCS字段定义在 CPRI控制字中的用户自定义区域。 上述 FCS字段中定义的每个 FCS控制字长度为 8bit。 进一步的, 在 CPRI链路数据接收端将当前帧中携带的上一帧的 FCS与 緩存的上一帧的 FCS进行比较之后, 上述方法还包括: 上述 CPRI链路数据接收端在预先配置的超帧定时器 T2到时时,若上一 帧校验为出现误码且预先配置的误码统计计数器未满, 将误码统计计数器加
上述 CPRI链路数据接收端在预先配置的误码统计定时器 T1到时时,判 断误码统计计数器是否达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。 其中, 上述 CPRI链路数据接收端在误码统计定时器 T1到时后, 将误码 统计计数器统计的结果进行緩存后清零。 根据本发明的另一个方面, 提供了一种通用公共无线接口 CPRI链路误 码监测系统, 包括: CPRI链路数据发送装置, 包括:
CPRI组帧模块,用于将待发送的数据组帧处理后输出;其中,在组帧时, 上述 CPRI组帧模块将帧校验序列获取模块发送的上一帧的 FCS添加到当前 帧的 FCS字段中; 帧校验序列获取模块, 用于接收上述 CPRI组帧模块输出的帧数据, 运 算得到每帧的帧校验序列 FCS , 并将该 FCS向上述 CPRI组帧模块发送;
CPRI链路数据接收装置, 包括: CPRI拆帧模块, 用于对上述 CPRI组帧模块输出的帧数据进行拆帧, 得 到当前帧中携带的上一帧的 FCS , 并将该 FCS向误码监测模块发送; 误码监测模块, 用于对上述 CPRI组帧模块发送的帧数据进行运算得到 当前帧自身的 FCS后緩存,将上述 CPRI拆帧模块发送的上一帧的 FCS与緩 存的上一帧的 FCS进行比较, 若比较结果不一致, 则判定 CPRI链路出现误 码。 上述误码监测模块, 还用于在预先配置的超帧定时器 T2到时时, 若上 一帧校验为出现误码且预先配置的误码统计计数器未满, 将误码统计计数器 加一; 在预先配置的误码统计定时器 T1到时时, 判断误码统计计数器是否 达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。 上述误码监测模块, 还用于在误码统计定时器 T1到时后, 将误码统计 计数器统计的结果进行緩存后清零。 根据本发明的又一个方面, 提供了一种通用公共无线接口 CPRI链路误 码监测装置, 包括: CPRI组帧模块,用于将待发送的数据组帧处理后输出;其中,在组帧时, 上述 CPRI组帧模块将帧校验序列获取模块发送的上一帧的 FCS添加到当前 帧的 FCS字段中; 帧校验序列获取模块, 用于接收上述 CPRI组帧模块输出的帧数据, 运 算得到每帧的帧校验序列 FCS , 并将该 FCS向上述 CPRI组帧模块发送; CPRI拆帧模块, 用于对 CPRI链路数据发送端发送的帧数据进行拆帧, 得到当前帧中携带的上一帧的 FCS , 并将该 FCS向误码监测模块发送; 误码监测模块, 用于对 CPRI链路数据发送端发送的帧数据进行运算得 到当前帧自身的 FCS后緩存,将上述 CPRI拆帧模块发送的上一帧的 FCS与 緩存的上一帧的 FCS进行比较, 若比较结果不一致, 判定 CPRI链路出现误 码。 上误码监测模块, 还用于在预先配置的超帧定时器 T2到时时, 若上一 帧校验为出现误码且预先配置的误码统计计数器未满, 将误码统计计数器加 一; 在预先配置的误码统计定时器 T1到时时, 判断误码统计计数器是否达 到预设的阈值, 若是, 向上层报警; 其中, T1>T2。 上述误码监测模块, 还用于在误码统计定时器 T1到时后, 将误码统计 计数器统计的结果进行緩存后清零。 与现有技术相比, 本发明有益效果如下: 通过本发明提供的技术方案, 能够在不影响业务正常工作的情况下对 CPRI链路的误码情况进行监测。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍, 显而易见地, 下 面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲, 在不付出创造性劳动性的前提下, 还可以根据这些附图获得其他的附图。 图 1为本发明提供的方法中 FCS字段在 CPRI控制字中的定义示意图; 图 2为本发明提供的 CPRI链路误码监测方法流程图; 图 3为本发明提供的 CPRI链路误码监测系统结构图; 图 4为本发明提供的数据发送方向上帧数据的处理示意图; 图 5为本发明提供的数据接收方向上帧数据的处理示意图; 图 6为本发明提供的误码预警和误码上 4艮的处理流程图; 图 7为本发明提供的 CPRI链路误码监测装置结构图。 具体实施方式 下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有故 出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 为了解决现有技术中对于误码的监测只能在中断业务情况下进行的问 题, 本发明提供一种 CPRI链路误码监测方法、 系统和装置。 本发明提供的方法在进行误码监测前,需要预先定义一 FCS字段( Frame Check Sequence, 帧校验序列), 作为误码监测的传输载体和判断基准。 其中, 上述 FCS字段可以优选地定义在 CPRI标准控制字部分中预留的 一段用户子定义区域中, 从中选取一个或几个字段, 定义为 CPRI链路误码 校验字段 FCS , 下面以选取 4个字段为例进行说明: 从用户自定义区域中选定 4个字段, 定义为 CPRI链路误码校验字段 FCS , 其对应基本帧号分别为: M, M+64, M+128, M+192, 其中 M (小于 64 ) 为选定的一个用户自定义字段, 当然上述选取基本帧号仅是一种较佳方 式, 本发明并不限于这一种选取方式。 本发明中, 为了对 CPRI的多种链路速率釆用统一定义, 这 4个控制字 仅使用其低 8bit, 共组成 32bit的 FCS字段, 如图 1所示, 为本发明中 FCS 字段在 CPRI控制字中的定义示意图, 图中 FCS_0、 FCS 1 , FCS 2, FCS 3 均为控制字的低 8bit,这 4个控制字组成 1个 32位的 FCS字段,其中 FCS_0 表示 FCS的 bit7〜0, FCS_l表示 FCS的 bitl5〜8, FCS_2表示 FCS的 bit23〜16, FCS 3表示 FCS的 bit31〜24。 图中 P为定义的快速 ( fast ) C&M的起始位 置, 选择的 M值要满足 16<M<P。 需要说明是, 在图 1中, 子信道序号为 2 的子信道功能为 L1 内部协议 ( LI inband prot. ) ,且 Xs=l时定义为启动 ( startup )。 通常不同 CPRI链路速率对应的控制字长度不同, 具体表现为: CPRI链 路速率为 614.4Mbps时, 控制字长度为 8bit; CPRI链路速率为 1.2288Gbps 时,控制字长度为 16bit; CPRI链路速率为 2.4576Gbps时,控制字长度为 32bit; CPRI链路速率为 3.072Gbps时, 控制字长度为 40bit; CPRI链路速率为 4.9152Gbps时, 控制字长度为 64bit; CPRI链路速率为 6.144Gbps时, 控制 字长度为 80bit, CPRI链路速率为 9.8304Gbps时, 控制字长度为 128bit。 为 了适应各种链路速率, 本发明中将选定的控制字长度优选的定义为 8bit。 基于上述 FCS字段定义基础,本发明提供的方法的基本原理是:在 CPRI 链路的发送端, 增加一个 CRC ( Cyclic Redundancy Check , 循环冗余校验 ) 产生功能模块, 系统约定在 CPRI发送端和接收端釆用统一的 CRC生成多项 式。 CRC产生功能模块根据 CPRI的帧定时参考, 对 CPRI—个超帧内的所 有数据进行 CRC运算, 将得到的 CRC结果进行緩存, 在 CPRI下一个超帧 的 FCS字段位置填入。 在 CPRI链路的接收端, 增加一个 CRC校验功能模块, 釆用系统约定的 CRC多项式。 CRC校验功能模块根据 CPRI的帧定时参考, 对 CPRI—个超 帧内的所有数据进行 CRC运算, 将得到的 CRC结果进行緩存, 在 CPRI下 一个超帧的 FCS字段位置与接收到的 CRC字段的内容进行比较, 完全相同 则认为检-险正确, 否则, 判定为出现误码。 当然, 本发明中釆用 CRC运算获取帧数据的 FCS只是本发明的一种较 佳实现方式,对于能够实现获取帧数据的 FCS的方式均在本发明的保护范围 内。 具体的, 本发明提供的 CPRI链路误码监测方法, 如图 2所示, 包括以 下步 4聚: 步骤 S201、 CPRI链路数据发送端对待发送的数据进行组帧后输出, 并 利用 CRC运算得到每帧的帧校验序列 FCS; 其中, 在组帧时, CPRI链路 数据发送端将上一帧的 FCS添加到当前帧的 FCS字段中; 步骤 S202、 CPRI链路数据接收端对接收到的帧数据进行拆帧得到当前 帧中携带的上一帧的 FCS、 对接收到的帧数据进行 CRC运算得到当前帧自 身的 FCS并緩存; 步骤 S203、 CPRI链路数据接收端将当前帧中携带的上一帧的 FCS与緩 存的上一帧的 FCS进行比较, 若比较结果不一致, 则判定 CPRI链路出现误 码。 优选的, 上述述方法中, CPRI链路数据接收端还可以预先配置两个定时 器和一个计数器, 用于实现误码的预警。 具体的, CPRI链路数据接收端在预先配置的超帧定时器 T2到时时, 若上一帧校验为出现误码且预先配置的误码统计计数器未满, 将误码统计计 数器加一; 并在预先配置的误码统计定时器 T1到时时, 判断误码统计计数 器是否达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。 优选的, CPRI链路数据接收端在误码统计定时器 T1到时后, 还可以将 误码统计计数器统计的结果进行緩存后清零。 本发明还提供一种 CPRI链路误码监测系统, 如图 3所示, 该系统包括 CPRI链路数据发送装置 32和 CPRI链路数据接收装置 34, 且 PRI链路数据 发送装置 32和 CPRI链路数据接收装置 34间通过光纤或线缆连接; 具体的, 如图 3所示, CPRI链路数据发送装置 32 , 包括: CPRI组帧模块 322, 用于将接收到的数据组帧后输出至串并行 /并串行 转换( Serialize/Deserialize, 简称为 SERDES )模块 326和帧校验序列获取模 块 324; 其中, 在进行数据组帧时, 将帧校验序列获取模块 324发送的上一 帧的 FCS添加到当前帧的 FCS字段中; 帧校验序列获取模块 324, 用于对接收到的帧数据进行 CRC运算, 并将 计算得到的每帧的 FCS发送至 CPRI组帧模块 322;
SERDES模块 326,用于将接收到的帧数据传送至 CPRI链路数据接收装 置 34; 具体的, CPRI链路数据接收装置 34, 包括:
SERDES模块 346, 用于接收帧数据, 并将该帧数据发送至 CPRI拆帧模 块 342和误码监测模块 344;
CPRI拆帧模块 342 , 用于对接收到的帧数据进行拆帧处理, 提取当前帧 中携带的上一帧的 FCS后, 将该 FCS向误码监测模块 344发送, 并将拆帧 后的数据向上层发送; 误码监测模块 344, 用于对接收到的帧数据进行 CRC运算, 计算得到当 前帧自身的 FCS后緩存,将 CPRI拆帧模块发送的上一帧的 FCS与緩存的上 一帧的 FCS进行比较, 若比较结果不一致, 则判定为 CPRI链路出现误码。 优选的,上述 CRC运算可以利用 CRC运算器进行 CRC运算;上述 CRC 运算器为下述运算器中的一个但并不限于下述几种类型: CRC8、 CRC 10, CRC 16, CRC32或者 CRC64运算器。 较佳地, 釆用 CRC32运算器来实现, 当釆用 CRC32运算器计算时, 运算釆用的多项式为:
G(x) = x32 +x26 +x23 +x22 +x16 +x12 + xn+x10+x8 + x7+x5+x4 + x2+x + l 下面就以 CRC32运算器为例对发送和接收方向的帧处理过程进行说明。 如图 4所示, 为本发明提供的发送方向的数据帧处理过程示意图, 图中 所示 CPRI超帧号分别为 N和 N+1的两帧数据,超帧 N的所有数据送到帧校 验序列获取模块进行 CRC32运算, 其 32位运算结果 FCS(N)的 bit7〜0即 FCS_0(N)、bitl5〜8即 FCS_l(N)、bit23〜16即 FCS_2(N)、bit31〜24即 FCS_3(N) 分别填充到超帧 N+1的基本帧号 M、 M+64、 M+128、 M+192的控制字的氐 8bit。 如图 5所示, 为本发明提供的接收方向的数据帧处理过程示意图, 图中 所示 CPRI超帧号分别为 N和 N+1的两帧数据,超帧 N的所有数据送到误码 监测模块进行 CRC32运算,其 32位运算结果 FCS(N)进行緩存。从超帧 N+1 中将 FCS_0(N)、 FCS_1(N)、 FCS_2(N)、 FCS_3(N)分别解析出来后进行组合 得到接收到的超帧 N的 CRC32结果。 将该结果与该模块计算并緩存的超帧 N的 FCS(N)进行对比, 相同则认为正确, 否则认为错误, 出现误码。 优选的, 误码监测模块 344内部还可以布置有误码统计周期定时器 Tl、 CPRI超帧周期定时器 T2和误码统计计数器 Err_cnt (图中未示出), 优选的, T1远大于 T2。 本发明中, 通过定时器和计数器来判定设定周期内的误码率 是否达到预设的阈值, 从而达到误码上报和误码预警的目的。 具体的, 如图 6所示, 为本发明提供的误码预警和误码上 4艮的处理流程 图, 包括以下步 4聚: 步骤 S601、误码监测模块 344检测超帧周期定时器 T2是否到时, 若是, 执行步骤 S602; 否则, 执行步骤 S605; 步骤 S602、 误码监测模块 344检测误码统计计数器 Err_cnt是否为非满 且上一帧校验出错, 若是, 执行步骤 S603; 否则, 执行步骤 S604; 步骤 S603、 将误码统计计数器 Err_cnt加一, 返回步骤 S601; 步骤 S604、 保持误码统计计数器 Err_cnt不变, 返回步骤 S601 ; 步骤 S605、 误码监测模块 344检测误码统计周期定时器 T1是否到时, 若是, 执行步骤 S606; 否则, 返回步骤 S601 ; 步骤 S606、检测误码统计计数器 Err_cnt是否达到最大值 ErrMax,若是, 执行步骤 S607; 否则, 执行步骤 S608; 步骤 S607、 误码监测模块输出告警( Alarm )进行预警, 执行步骤 S608; 步骤 S608、 误码监测模块将 Err_cnt緩存到到前一统计周期误码计数器 Err last, 并将 Err cnt清零, 返回步 4聚 S601。 其中, 通过将误码统计计数器 Errjast的值进行緩存, 可以达到随时被 系统访问, 供查询 CPRI链路误码情况的目的。 进一步的, 本发明还提供了一种 CPRI链路误码监测装置, 如图 7所示, 该装置可以部署在 CPRI链路数据发送端或者部署在 CPRI链路数据接收端, 即该装置为一数据收发器。 具体的, 该装置包括:
CPRI组帧模块 70, 用于将待发送的数据组帧处理后输出; 其中, 在组 帧时, CPRI组帧模块 70将帧校验序列获取模块 72发送的上一帧的 FCS添 加到当前帧的 FCS字段中; 帧校验序列获取模块 72, 用于对 CPRI组帧模块 70输出的帧数据进行 CRC运算得到每帧的帧校验序列 FCS , 并将该 FCS向 CPRI组帧模块 70发 送; CPRI拆帧模块 74,用于对 CPRI链路数据发送端发送的帧数据进行拆帧, 得到当前帧中携带的上一帧的 FCS后向误码监测模块 76发送; 误码监测模块 76,用于对 CPRI链路数据发送端发送的帧数据进行 CRC 运算得到当前帧自身的 FCS后緩存, 将 CPRI拆帧模块发送的上一帧的 FCS 与緩存的上一帧的 FCS进行比较, 若比较结果不一致, 判定为 CPRI链路出 现误码。 其中, 优选地, 误码监测模块 76, 还可以用于在预先配置的超帧定时器 T2到时时, 若上一帧校-险为出现误码且预先配置的误码统计计数器未满, 则 将误码统计计数器加一; 在预先配置的误码统计定时器 T1到时时, 判断误 码统计计数器是否达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。 优选的, 误码监测模块 76, 还可以用于在误码统计定时器 T1到时后, 将误码统计计数器统计的结果进行緩存后清零。 优选的, 该装置还具有一 SERDES模块 78, 用于数据收发的接口。 通过本发明提供的方法、 系统和装置, 可以得到以下有益效果: 本发明能够在不影响业务正常工作的情况下对 CPRI链路的误码情况进 行监测; 并且, 由于在业务运行的情况下, 小数量的误码可能并不明显影响业务, 在这种情况下, 本发明提供的方法提出误码率的 4既念, 并在误码率较高时提 供预警功能, 对于设备的稳定性维护提供有效手段, 同时也可作为对 CPRI 链路稳定性评估的量化依据; 其次, 本发明通过定义 FCS控制字的长度, 能够兼容 CPRI标准所定义 的所有速率接口。 显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求 书
1. 一种通用公共无线接口 CPRI链路误码监测方法, 其特征在于, 包括:
CPRI链路数据发送端对待发送的数据进行组帧后输出,并运算得到 每帧的帧校-险序列 FCS; 其中, 在组帧时, 所述 CPRI链路数据发送端 将上一帧的 FCS添加到当前帧的 FCS字段中;
CPRI 链路数据接收端对接收到的帧数据进行拆帧得到当前帧中携 带的上一帧的 FCS、 对接收到的帧数据进行运算得到当前帧自身的 FCS 后緩存,将当前帧中携带的上一帧的 FCS与緩存的上一帧的 FCS进行比 较, 若比较结果不一致, 则判定 CPRI链路出现误码。
2. 如权利要求 1所述的方法, 其特征在于, 所述 CPRI链路数据发送端和 CPRI链路数据接收端利用循环冗余校验 CRC运算获取帧数据的 FCS。
3. 如权利要求 1所述的方法, 其特征在于, 所述 FCS字段定义在 CPRI控 制字中的用户自定义区域。
4. 如权利要求 3所述的方法,其特征在于,所述 FCS字段中定义的每个 FCS 控制字长度为 8bit。
5. 如权利要求 1至 4中任一项所述的方法, 其特征在于, 在所述 CPRI链 路数据接收端将当前帧中携带的上一帧的 FCS 与緩存的上一帧的 FCS 进行比较之后, 还包括: 所述 CPRI链路数据接收端在预先配置的超帧定时器 T2到时时,若 上一帧校 -险为出现误码且预先配置的误码统计计数器未满, 将所述误码 统计计数器加一; 所述 CPRI链路数据接收端在预先配置的误码统计定时器 T1 到时 时, 判断所述误码统计计数器是否达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。
6. 如权利要求 5所述的方法, 其特征在于, 所述 CPRI链路数据接收端在 所述误码统计定时器 T1到时后,将所述误码统计计数器统计的结果进行 緩存后清零。
7. —种通用公共无线接口 CPRI链路误码监测系统, 其特征在于, 包括:
CPRI链路数据发送装置, 包括:
CPRI组帧模块, 用于将待发送的数据组帧处理后输出; 其中, 在组 帧时, 所述 CPRI组帧模块将帧校验序列获取模块发送的上一帧的 FCS 添加到当前帧的 FCS字段中; 帧校验序列获取模块, 用于接收所述 CPRI组帧模块输出的帧数据, 运算得到每帧的帧校验序列 FCS , 并将该 FCS向所述 CPRI组帧模块发 送;
CPRI链路数据接收装置, 包括:
CPRI拆帧模块,用于对所述 CPRI组帧模块输出的帧数据进行拆帧, 得到当前帧中携带的上一帧的 FCS , 并将该 FCS向误码监测模块发送; 误码监测模块, 用于对所述 CPRI组帧模块发送的帧数据进行运算 得到当前帧自身的 FCS后緩存, 将所述 CPRI拆帧模块发送的上一帧的 FCS与緩存的上一帧的 FCS进行比较,若比较结果不一致,则判定 CPRI 链路出现误码。
8. 如权利要求 7所述的系统, 其特征在于, 所述误码监测模块, 还用于在预先配置的超帧定时器 T2 到时时, 若上一帧校验为出现误码且预先配置的误码统计计数器未满, 将所述误 码统计计数器加一; 在预先配置的误码统计定时器 T1 到时时, 判断误 码统计计数器是否达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。
9. 如权利要求 8所述的系统, 其特征在于, 所述误码监测模块, 还用于在 所述误码统计定时器 T1到时后,将所述误码统计计数器统计的结果进行 緩存后清零。
10. —种通用公共无线接口 CPRI链路误码监测装置, 其特征在于, 包括:
CPRI组帧模块, 用于将待发送的数据组帧处理后输出; 其中, 在组 帧时, 所述 CPRI组帧模块将帧校验序列获取模块发送的上一帧的 FCS 添加到当前帧的 FCS字段中; 帧校验序列获取模块, 用于接收所述 CPRI组帧模块输出的帧数据, 运算得到每帧的帧校验序列 FCS , 并将该 FCS向所述 CPRI组帧模块发 送;
CPRI拆帧模块, 用于对 CPRI链路数据发送端发送的帧数据进行拆 帧, 得到当前帧中携带的上一帧的 FCS , 并将该 FCS向误码监测模块发 送; 误码监测模块, 用于对 CPRI链路数据发送端发送的帧数据进行运 算得到当前帧自身的 FCS后緩存, 将所述 CPRI拆帧模块发送的上一帧 的 FCS与緩存的上一帧的 FCS进行比较,若比较结果不一致,判定 CPRI 链路出现误码。
11. 如权利要求 10所述的装置, 其特征在于, 所述误码监测模块, 还用于在预先配置的超帧定时器 T2 到时时, 若上一帧校验为出现误码且预先配置的误码统计计数器未满, 将所述误 码统计计数器加一; 在预先配置的误码统计定时器 T1 到时时, 判断误 码统计计数器是否达到预设的阈值, 若是, 向上层报警; 其中, T1>T2。
12. 如权利要求 11所述的装置, 其特征在于, 所述误码监测模块, 还用于在 所述误码统计定时器 T1到时后,将所述误码统计计数器统计的结果进行 緩存后清零。
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