WO2012159570A1 - 链路倒换方法和装置 - Google Patents

链路倒换方法和装置 Download PDF

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Publication number
WO2012159570A1
WO2012159570A1 PCT/CN2012/075968 CN2012075968W WO2012159570A1 WO 2012159570 A1 WO2012159570 A1 WO 2012159570A1 CN 2012075968 W CN2012075968 W CN 2012075968W WO 2012159570 A1 WO2012159570 A1 WO 2012159570A1
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Prior art keywords
rru
link
delay
compensation value
bbu
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PCT/CN2012/075968
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English (en)
French (fr)
Inventor
黄伟
黄萍
黄海
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中兴通讯股份有限公司
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Publication of WO2012159570A1 publication Critical patent/WO2012159570A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42Loop networks
    • H04L12/437Ring fault isolation or reconfiguration

Definitions

  • the present invention relates to the field of communications, and in particular to a link switching method and apparatus.
  • BACKGROUND OF THE INVENTION Stable network quality is a basic requirement for communication, C-RAN (Green Radio Access Network, Clean Radio)
  • the Access Network architecture is introduced with the guarantee of network quality, and the RRU ring protection technology is the key technology in the C-RAN architecture.
  • RRU Remote Radio Frequency Unit
  • the RRU ring-forming optical port adopts dual-receipt direction processing and single-issue mechanism.
  • the loop-shaped optical port of the BBU Base Band Unit
  • the dual-receiving mechanism ensures that when the ring network is disconnected, the active and standby optical ports of the BBU and the RRU are switched, and the service data can be sent and received as usual.
  • the delay compensation value of the corresponding RRU needs to be updated.
  • the present invention provides a link switching method and apparatus to solve at least the problem that the service cannot be continuously operated in the prior art when link switching occurs.
  • a link switching method including: when an RRU ring network link is normal, an RRU in an RRU ring network receives a delay compensation value of a transmission link in two directions from a BBU; When the RRU ring link is broken and switched, the RRU switches the delay compensation value in one direction used before the switchover to the delay compensation value in the other direction after the switchover.
  • the step of the RRU in the RRU ring network receiving the delay compensation value of the transmission link in the two directions from the BBU includes: when the RRU ring network link is normal, the BBU receives the device delay of the RRU reported by the RRU; The device delay and the detected fiber link delay calculate the delay compensation value of the transmission link in both directions; the BBU sends the delay compensation value of the transmission link in both directions to the RRU.
  • the step of the BBU receiving the device delay of the RRU reported by the RRU includes: the RRU reports the device delay to the BBU upon power-on.
  • the step of the RRU in the RRU ring network receiving the delay compensation value of the transmission link in the two directions from the BBU includes: if the delay compensation value is changed, the BBU sends the changed delay compensation value to the RRU.
  • the RRU detects if there is a link break in the RRU ring by curing the detection program in the hardware.
  • the link switching method further includes: the BBU detects the link disconnection of the RRU ring network by curing the detection program in the hardware. If the BBU detects a link break in the RRU ring network, the BBU performs its own optical port switching.
  • the delay compensation value includes the delay compensation value of the different optical ports.
  • the step of the RRU switching the delay compensation value in one direction used before the switching to the delay compensation value in the other direction after the switching includes: RRU determining chain The optical port used after the switchover is performed; the RRU uses the delay compensation value corresponding to the optical port to perform the switching delay setting; the RRU performs link switching according to the switching delay setting.
  • a link switching apparatus located on an RRU, the link switching apparatus comprising: a transmission unit configured to receive transmissions from two directions of the BBU when the RRU ring link is normal The delay compensation value of the link; the switching unit is configured to switch the delay compensation value in one direction used before the switching to the delay compensation in the other direction after the switching when the RRU ring link is broken. value.
  • the link switching device further includes: a detecting unit configured to detect whether a link disconnection occurs in the RRU ring network by a detection procedure that is solidified in hardware of the RRU.
  • the transmission unit includes: a sending module, configured to report the device delay to the BBU when the power is turned on; and the receiving module, configured to receive the delay compensation value of the transmission link from the BBU in both directions when the RRU ring link is normal
  • the delay compensation value is calculated by the BBU according to the device delay of the RRU and the detected fiber link delay.
  • the delay compensation value can be used for switching, which ensures the uninterrupted operation of the service, and solves the problem that the existing technology cannot ensure the uninterrupted operation of the service;
  • the invention replaces the manual by the RRU automatic detection and switching method. The way of detecting and switching greatly reduces the time to discover broken links and repair the network;
  • the invention is implemented by the RRU and the BBU's own firmware detection instead of the application software timing detection, which avoids the message flow interaction between the same board and different boards, and shortens the interaction time;
  • the present invention adopts a method in which the BBU and the RRU are jointly detected instead of the BBU or the RRU, thereby improving the sensitivity of the network and achieving fast switching when the link is broken.
  • the invention adopts the self-detection and self-switching mode of the BBU and the RRU firmware, and transfers the chain-spinning switching work to the firmware, which greatly reduces the firmware workload.
  • FIG. 1 is a preferred flowchart of a link switching method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a link switching scheme according to an embodiment of the present invention
  • FIG. 4 is a flow chart of detecting and storing fiber delay according to an embodiment of the present invention
  • FIG. 5 is a diagram showing a state of an RRU ring network according to an embodiment of the present invention
  • FIG. 6 is a diagram of an RRU ring network according to an embodiment of the present invention
  • FIG. 7 is a preferred structural diagram of a link switching device according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS Embodiment 1 FIG. 1 is a preferred flowchart of a link switching method according to an embodiment of the present invention, which includes the following steps:
  • the RRU in the RRU ring network receives the delay compensation value of the transmission link in the two directions from the BBU.
  • the present invention provides a preferred method for transmitting a delay compensation value.
  • the step of the RRU in the RRU ring network receiving the delay compensation value of the transmission link from the BBU in both directions includes: When the link is normal, the BBU receives the device delay of the RRU reported by the RRU; the BBU calculates the delay compensation value of the transmission link in the two directions according to the device delay of the RRU and the detected fiber link delay; The delay compensation value of the transmission link in the direction is sent to the RRU.
  • the present invention provides a preferred device delay reporting step.
  • the step of the BBU receiving the device delay of the RRU reported by the RRU includes: the RRU reports the device delay to the BBU upon power-on.
  • the step of the RRU in the RRU ring network receiving the delay compensation value of the transmission link from the BBU in both directions includes: If the delay compensation value changes, the BBU sends the changed delay compensation value to the RRU.
  • the delay compensation value includes the delay compensation value of the different optical ports.
  • the step of the RRU switching the delay compensation value in one direction used before the switching to the delay compensation value in the other direction after the switching includes: RRU determining chain The optical port used after the switchover is performed; the RRU uses the delay compensation value corresponding to the optical port to perform the switching delay setting; the RRU performs link switching according to the switching delay setting.
  • the present invention further provides a specific preferred solution, as shown in FIG. 2.
  • the link switching method consists of three modules: fiber delay detection and storage, delay setting, and chain break switching.
  • the specifics include: The fiber delay analysis and storage module measures the fiber delay of the RRU corresponding to the two links.
  • the delay setting module performs the delay setting, and the chain breaking switching module performs the chain breaking detection and controls the switching of the master and backup optical ports in time.
  • the link switching method shown in Figure 2 specifically includes the following steps:
  • the RRU reports the device delay to the BBU.
  • the BBU measures the fiber delay through loopback detection and calculates the fiber delay value of the two links in combination with the device delay. .
  • the device delay is reported at power-on, which is only an example of the present invention.
  • the RRU of the present invention can also report the device delay when other links are normal.
  • the fiber delay detection and storage module stores the calculated fiber delay value in DBS (Database System).
  • DBS Database System
  • the fiber delay detection and storage module calculates the fiber delay compensation value in both directions of the RRU and sends the fiber delay compensation value to the RRU.
  • the delay setting module selects the delay compensation value in a certain direction according to the active/standby state of the current optical interface of the RRU, and the delay compensation takes effect.
  • the link-breaking module is responsible for detecting the link status of the BBU and the RRU.
  • the delay compensation value includes the delay compensation value of the different optical interfaces, wherein the step of performing the link switching by the RRU using the delay compensation value includes: the RRU determines the optical port used after the link switching; the RRU uses the optical port corresponding to the optical port The delay compensation value is set for the switching delay; the RRU performs link switching according to the switching delay setting.
  • the RRU can detect if a link break occurs in the RRU ring by curing the detection procedure in hardware.
  • the RRU's own firmware detection replaces the application software detection, and the detection mode of the firmware can detect the link status by using the detection frequency higher than the application software, thereby avoiding the same board and different orders.
  • the message flow interaction between boards shortens the interaction time.
  • the firmware workload is hardly increased, the difficulty and complexity of the software are greatly reduced.
  • the development cycle is shortened and the development cost is reduced. , to achieve a smooth transition.
  • the link switching method further includes: the BBU detects whether the RRU ring network has a link by curing the detection program in the hardware.
  • the preferred embodiment adopts a method in which the BBU and the RRU are jointly detected instead of the BBU or the RRU, thereby improving the sensitivity of the network and achieving fast switching when the link is broken.
  • the fiber delay consists of the device delay on the RRU and the delay on the fiber between the RRU and the BBU.
  • the forward device delay is the delay from each node of the RRU to its main optical port (such as the delay of All, A12, A13, A14, A15 in RRU#1);
  • the delay from the RRU to the optical port (such as the delay of A21, A22, A23, A24, and A25 in RRU#2);
  • the fiber link delay is the fiber between the BBU optical port and the RRU and between the RRUs.
  • the delay of the link (such as the delay of Bl, B2, B3, and B4); the delay of the forward link is the delay of each RRU antenna port and the BBU main optical port (such as the delay of P1 and Ant1);
  • the link delay is the delay between the RRU antenna port and the BBU optical port (such as the delay between P2 and Ant2).
  • the device delay is reported on the RRU. After the RRU is powered on, the device delay parameter is reported to the BBU.
  • the BBU calculates the fiber delay:
  • the BBU is responsible for the delay detection of the board (such as the optical port interface board). Calculate the delay on the fiber of a certain RRU based on the loopback detection and calculate the RRU forward and reverse links according to the device delay. The value of the fiber delay is reported to the master board of the BBU when the conditions of the report are met.
  • Fiber delay storage When the main control board receives the reported fiber delay, it stores the fiber delay value in the DBS.
  • Fiber delay compensation value calculation After the delay is changed, the fiber delay compensation value calculation module calculates the fiber delay compensation value of the RRU and sends it to the RRU.
  • Delay setting The delay setting is performed in two scenarios: delay update after RRU delay change and delay switching after RRU chain breakover.
  • the delay of the RRU delay is updated.
  • the delay is reported to the BBU.
  • the BBU stores and calculates the delay compensation.
  • the delay setting module sets the compensation value according to the active/standby status of the current optical port to make the delay compensation take effect.
  • Delay switching after RRU chain breakover After the RRU is broken and the primary and backup optical ports are switched, the delay compensation needs to be reset with the compensation value in the other direction. For example, if an RRU of a ring network is running normally, its main optical port is optical port 0, and the forward delay compensation value is used. When the optical port of the RRU is broken, the main optical port is switched to No. 1. For the optical port, you need to compensate with the reverse delay value. To ensure fast switching of the delay, the delay setting during switching is done by firmware. 3) Broken chain switching
  • the link status of the RRU ring network can be divided into normal and broken links. See Figure 5 for the normal ring network and the broken link ring network.
  • the broken link ring network can be divided into two cases: Up/down (front reverse) fiber break chain (Figure break chain point 1 and
  • RRU ring network chain breaking is shown in Figure 6.
  • RRU#2 and RRU#3 When RRU#2 and RRU#3 are broken, RRU#2 detects its forward link disconnection through LOOPTEST, because RRU#2 is located in the broken link.
  • the optical port (P2 port) is switched on one side. Therefore, the optical port is switched by the RRU firmware.
  • the original optical port is switched to the main optical port.
  • the original optical port is switched to the optical port (RRU#). 4 similar).
  • the BBU main optical port detects that the RRU ring network has a broken link through LOOPTEST, it does not switch the optical port.
  • the BBU optical port detects that the RRU ring network has a broken link through LOOPTEST, it switches the optical port to the main optical port.
  • the link after the completion of the switching is shown in the broken link ring portion of Figure 5.
  • the RRU firmware uses the original reverse delay compensation value issued as the new delay compensation value to reset. After all the RRUs that need to be switched are switched, the ring link enters the steady state again.
  • a ring network composed of four RRUs is configured, and only corresponding sectors are configured on a certain RRU (RRU#2 or RRU#3). Configure P1 as the primary optical port and P2 as the optical port. After the boards of the BBU and the RRUs are powered on, the RRU reports the device delay. After receiving the RRU device delay, the BBU calculates its fiber delay and stores it in the database. At the same time, the fiber delay compensation value of the RRU is calculated and sent to the RRU.
  • FIG. 7 is a block diagram of a preferred configuration of a link switching apparatus according to an embodiment of the present invention.
  • the link switching apparatus includes: a transmission unit 702 configured to receive a BBU from a BBU when the RRU ring link is normal.
  • the switching unit 704 is connected to the transmission unit 702, and is configured to switch the delay compensation value in one direction used before the switching when the RRU ring link is broken and switched.
  • the delay compensation value in the other direction to be used after switching.
  • by delaying the delay compensation value for link switching to the RRU before the link is broken it is not necessary to spend time recalculating the delay compensation value when the link switching occurs. Transmission, but can directly use the delay compensation value for switching, which ensures the uninterrupted operation of the service, and solves the problem that the existing technology cannot guarantee the uninterrupted operation of the service.
  • the transmission unit 702 receives the delay compensation value of the transmission link from the two directions of the BBU by the following steps: when the RRU ring network link is normal, the BBU receives the device delay of the RRU reported by the transmission unit 702 of the RRU; the BBU according to the RRU The device delay and the detected fiber link delay calculate the delay compensation value of the transmission link in both directions; the BBU sends the delay compensation value of the transmission link in both directions to the RRU.
  • the transmission unit 702 of the RRU reports the device delay to the BBU upon power-on.
  • the BBU sends the changed delay compensation value to the transmission unit 702 of the RRU.
  • the link switching device further includes: a detecting unit 706 connected to the switching unit 704, configured to detect whether a link disconnection occurs in the RRU ring network by curing a detection program in hardware of the RRU.
  • a detecting unit 706 connected to the switching unit 704, configured to detect whether a link disconnection occurs in the RRU ring network by curing a detection program in hardware of the RRU.
  • the BBU detects the link disconnection of the RRU ring network by curing the detection program in the hardware; if the BBU detects the RRU ring network When a link is broken, the BBU performs its own optical port switching.
  • the transmitting unit 702 includes: a sending module 7021, configured to report the device delay to the BBU when the power is turned on; and the receiving module 7022, configured to receive the transmission link from the BBU in both directions when the RRU ring link is normal.
  • the delay compensation value wherein the delay compensation value is calculated by the BBU according to the device delay of the RRU and the detected fiber link delay.
  • the delay compensation value in the preferred embodiment includes delay compensation values of different optical interfaces, such that the RRU switching unit 704 performs link switching using the delay compensation value by the following steps:
  • the RRU determines the link used after the link switching
  • the RRU uses the delay compensation value corresponding to the optical port to set the switching delay.
  • the RRU performs link switching according to the switching delay setting.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

本发明提供了一种链路倒换方法和装置,其中,该方法包括:在RRU环网链路正常时,RRU环网中的RRU接收来自BBU的两个方向的传输链路的时延补偿值;在RRU环网链路断链而进行倒换时,RRU将倒换前使用的一个方向的时延补偿值切换到倒换后使用的另一个方向的时延补偿值。本发明解决了现有技术中在出现链路倒换时无法保证业务不间断运行的问题,保证了业务的不间断运行。

Description

链路倒换方法和装置 技术领域 本发明涉及通信领域, 具体而言, 涉及一种链路倒换方法和装置。 背景技术 稳定的网络质量是对通信的基本要求, C-RAN (绿色无线接入网, Clean Radio
Access Network) 架构正是以保障网络质量为出发点引入的, 而 RRU环网保护技术正 是 C-RAN架构中的关键技术。 RRU (远端射频单元, Remote Radio Frequency Unit) 环网下, RRU的成环光口采用双收单方向处理及单发机制, BBU (基带单元, Base Band Unit) 的成环光口采用双发双收机制, 从而保证在环网断链的情况下, 通过 BBU和 RRU的主备光口倒换, 业务数据可以照常收发。 同时, 由于 RRU环网存在两个方向 的传输链路, 环网断链时, 需要更新相应 RRU的时延补偿值。 在现有技术中, 若 RRU环网的链路发生断链, 则 RRU在光口切换后重新测量光 纤时延并上报到 BBU, 然后, BBU再重新计算时延补偿值并下发到 RRU, RRU使用 时延补偿值进行倒换设置, 这样需要耗费较长时间, 从而无法保证业务不间断运行。 发明内容 本发明提供了一种链路倒换方法和装置, 以至少解决现有技术中在出现链路倒换 时无法保证业务不间断运行的问题。 根据本发明的一个方面, 提供了一种链路倒换方法, 包括: 在 RRU环网链路正常 时, RRU环网中的 RRU接收来自 BBU的两个方向的传输链路的时延补偿值;在 RRU 环网链路断链而进行倒换时, RRU将倒换前使用的一个方向的时延补偿值切换到倒换 后使用的另一个方向的时延补偿值。
RRU环网中的 RRU接收来自 BBU的两个方向的传输链路的时延补偿值的步骤包 括: 在 RRU环网链路正常时, BBU接收 RRU上报的 RRU的器件时延; BBU根据 RRU的器件时延以及检测到的光纤链路时延计算两个方向的传输链路的时延补偿值; BBU将两个方向的传输链路的时延补偿值发送给 RRU。
BBU接收 RRU上报的 RRU的器件时延的步骤包括: RRU在上电时将器件时延 上报给 BBU。 RRU环网中的 RRU接收来自 BBU的两个方向的传输链路的时延补偿值的步骤包 括: 若时延补偿值发生改变, BBU将改变后的时延补偿值发送给 RRU。
RRU通过固化在硬件中的检测程序来检测 RRU环网是否出现链路断链。 在 RRU通过固化在硬件中的检测程序来检测 RRU环网是否出现链路断链时, 链 路倒换方法还包括: BBU通过固化在硬件中的检测程序来检测 RRU环网是否出现链 路断链; 若 BBU检测 RRU环网出现链路断链, 则 BBU进行自身的光口的倒换。 时延补偿值包括不同光口的时延补偿值, 其中, RRU将倒换前使用的一个方向的 时延补偿值切换到倒换后使用的另一个方向的时延补偿值的步骤包括: RRU确定链路 倒换后所使用的光口; RRU使用光口对应的时延补偿值进行倒换时延设置; RRU根 据倒换时延设置进行链路倒换。 根据本发明的另一方面, 提供了一种链路倒换装置, 位于 RRU上, 该链路倒换装 置包括: 传输单元, 设置为在 RRU环网链路正常时接收来自 BBU的两个方向的传输 链路的时延补偿值;倒换单元,设置为在 RRU环网链路断链而进行倒换时将倒换前使 用的一个方向的时延补偿值切换到倒换后使用的另一个方向的时延补偿值。 链路倒换装置还包括:检测单元,设置为通过固化在 RRU的硬件中的检测程序来 检测 RRU环网是否出现链路断链。 传输单元包括: 发送模块, 设置为在上电时将器件时延上报给 BBU; 接收模块, 设置为在 RRU环网链路正常时接收来自 BBU的两个方向的传输链路的时延补偿值, 其中,时延补偿值由 BBU根据 RRU的器件时延以及检测到的光纤链路时延计算得到。 本发明具有以下有益效果:
( 1 ) 通过在链路断链之前将用于链路倒换的时延补偿值发送给 RRU, 从而在发 生链路倒换时不需要花费时间对时延补偿值进行重新计算和传输, 而是直接可以使用 时延补偿值进行倒换, 这样保证了业务的不间断运行, 解决了现有技术中所存在的无 法保证业务不间断运行的问题; (2) 本发明通过 RRU自动检测和倒换方式代替人工检测和倒换的方式, 大大减 少了发现断链并修复网络的时间;
(3 ) 本发明由 RRU和 BBU 自身的固件检测代替应用软件定时检测的方式, 避 免了同一单板以及不同单板间的消息流程交互, 缩短了交互时间; (4) 本发明采用 BBU和 RRU共同检测而非 BBU或 RRU单一检测的方式, 提 高了网络的灵敏性, 实现断链时的快速切换。 在 RRU环网断链的场景下, 本发明采用 BBU和 RRU固件自检测、 自倒换的方 式, 将断链倒换工作都转移到固件完成, 在固件工作量几乎没有增加的情况下, 大大 降低了软件的实现难度和复杂度, 在保证业务质量的同时, 缩短了开发周期, 降低了 开发成本, 达到平滑过渡的目的。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据本发明实施例的链路倒换方法的一种优选流程图; 图 2是根据本发明实施例的链路倒换方案的示意图; 图 3是根据本发明实施例的光纤时延示意图; 图 4是根据本发明实施例的光纤时延检测与存储流程图; 图 5是根据本发明实施例的 RRU环网状态图; 图 6是根据本发明实施例的 RRU环网断链倒换示意图; 以及 图 7是根据本发明实施例的链路倒换装置的一种优选结构图。 具体实施方式 实施例 1 图 1是根据本发明实施例的链路倒换方法的一种优选流程图, 其包括如下步骤:
S102, 在 RRU环网链路正常时, RRU环网中的 RRU接收来自 BBU的两个方向 的传输链路的时延补偿值;
S104, 在 RRU环网链路断链而进行倒换时, RRU将倒换前使用的一个方向的时 延补偿值切换到倒换后使用的另一个方向的时延补偿值。 在本优选的实施例中, 通过在链路断链之前将用于链路倒换的时延补偿值发送给
RRU, 从而在发生链路倒换时不需要花费时间对时延补偿值进行重新计算和传输, 而 是直接可以使用时延补偿值进行倒换, 这样保证了业务的不间断运行, 解决了现有技 术中所存在的无法保证业务不间断运行的问题。 本发明提供了一种优选的时延补偿值的传输方法,具体而言, RRU环网中的 RRU 接收来自 BBU的两个方向的传输链路的时延补偿值的步骤包括: 在 RRU环网链路正 常时, BBU接收 RRU上报的 RRU的器件时延; BBU根据 RRU的器件时延以及检测 到的光纤链路时延计算两个方向的传输链路的时延补偿值; BBU将两个方向的传输链 路的时延补偿值发送给 RRU。 本发明提供了一种优选的器件时延上报的步骤, 具体而言, BBU接收 RRU上报 的 RRU的器件时延的步骤包括: RRU在上电时将器件时延上报给 BBU。
RRU环网中的 RRU接收来自 BBU的两个方向的传输链路的时延补偿值的步骤包 括: 若时延补偿值发生改变, BBU将改变后的时延补偿值发送给 RRU。 时延补偿值包括不同光口的时延补偿值, 其中, RRU将倒换前使用的一个方向的 时延补偿值切换到倒换后使用的另一个方向的时延补偿值的步骤包括: RRU确定链路 倒换后所使用的光口; RRU使用光口对应的时延补偿值进行倒换时延设置; RRU根 据倒换时延设置进行链路倒换。 针对图 1所示的链路倒换方法, 本发明进一步提供一种具体的优选方案, 如图 2 所示。 链路倒换方法由光纤时延检测与存储、 时延设置和断链倒换三个模块组成, 具 体包括: 由光纤时延检测与存储模块测量正反两个链路对应的 RRU的光纤时延值, 由 时延设置模块进行时延设置, 由断链倒换模块进行断链的检测并控制主备光口及时延 的切换。 如图 2所示的链路倒换方法具体包括如下步骤:
( 1 ) 在 BBU和环网各 RRU正常上电后, 由 RRU向 BBU上报器件时延, BBU 通过环回检测测量光纤时延并结合器件时延计算正反两个链路的光纤时延值。 当然, 在上电时上报器件时延,这只是本发明的一种示例,本发明的 RRU还可以在其他链路 正常的时刻上报器件时延。 然后,光纤时延检测与存储模块将计算出的光纤时延值存储在 DBS (数据库系统, DataBase System) 中。 (2)在 RRU的光纤时延值存储到 DBS中后,光纤时延检测与存储模块将计算该 RRU两个方向的光纤时延补偿值并下发给该 RRU。 时延设置模块根据该 RRU目前光 口的主备状态, 选择某个方向的时延补偿值进行设置, 时延补偿生效。
(3 ) 断链倒换模块负责 BBU和 RRU的链路状态检测, 当检测到环网链路断开 时, 倒换 BBU和 RRU的主备光口, 并且切换 RRU相应方向的时延补偿值。 这里, 时延补偿值包括不同光口的时延补偿值, 其中, RRU使用时延补偿值进行链路倒换的 步骤包括: RRU确定链路倒换后所使用的光口; RRU使用光口对应的时延补偿值进 行倒换时延设置; RRU根据倒换时延设置进行链路倒换。 在本发明的实施例中, RRU可以通过固化在硬件中的检测程序来检测 RRU环网 是否出现链路断链。在本优选的实施例中,由 RRU自身的固件检测代替应用软件检测, 并且这种固件的检测方式能够采用高于应用软件的检测频率来检测链路状态, 从而避 免了同一单板以及不同单板间的消息流程交互, 缩短了交互时间, 在固件工作量几乎 没有增加的情况下, 大大降低了软件的实现难度和复杂度, 在保证业务质量的同时, 缩短了开发周期, 降低了开发成本, 达到平滑过渡的目的。 进一步, 在 RRU通过固化在硬件中的检测程序来检测 RRU环网是否出现链路断 链时, 链路倒换方法还包括: BBU通过固化在硬件中的检测程序来检测 RRU环网是 否出现链路断链; 若 BBU检测 RRU环网出现链路断链, 则 BBU进行自身的光口的 倒换。本优选的实施例采用 BBU和 RRU共同检测而非 BBU或 RRU单一检测的方式, 提高了网络的灵敏性, 实现断链时的快速切换。 下面结合附图来详细描述图 2所示的各个处理过程。
1 ) 光纤时延检测与存储 光纤时延由 RRU上的器件时延和 RRU与 BBU间的光纤上的时延两部分组成。 如图 3所示, 正向器件时延为 RRU各节点到其主光口的时延 (如 RRU#1中的 All、 A12、 A13、 A14、 A15的时延); 反向器件时延为 RRU各节点到其备光口的时延 (如 RRU#2中的 A21、 A22、 A23、 A24、 A25的时延); 光纤链路时延为 BBU光口到 RRU 以及各 RRU之间的光纤链路的时延 (如 Bl、 B2、 B3、 B4的时延); 正向链路时延为 各 RRU天线口与 BBU主光口的时延(如 P1与 Antl的时延);反向链路时延为各 RRU 天线口与 BBU备光口的时延 (如 P2与 Ant2的时延)。 在环网的 RRU断链时, 如果光口切换后重新测量光纤时延并上报到 BBU, 再重 新计算好补偿值并下发到 RRU设置生效,需要耗费较长时间,无法保证业务不间断运 行。 因此, 需要在 RRU初始上电时测量正反两个传输链路的光纤时延。 光纤时延检测与存储模块由 RRU上器件时延上报、 BBU计算光纤时延、 光纤时 延存储和光纤时延补偿值计算并下发四个子模块构成, 如图 4所示。
RRU上器件时延上报: RRU上电进入空闲状态后, 向 BBU上报其器件时延参数。
BBU计算光纤时延: BBU负责时延检测的单板 (比如出光口接口板) 根据环回 检测测量的某 RRU的光纤上的时延并结合其器件时延计算该 RRU正反两个链路的光 纤时延值, 在满足上报的条件时, 上报给 BBU的主控单板。 光纤时延存储: 主控单板收到上报的光纤时延时, 将光纤时延值存储在 DBS中。 光纤时延补偿值计算: 时延变更后,光纤时延补偿值计算模块将计算该 RRU的光 纤时延补偿值, 并发往该 RRU。
2) 时延设置 时延设置在两个场景下进行: RRU时延变化后的时延更新以及 RRU断链倒换后 的时延切换。
RRU时延变化后的时延更新: 当 RRU初始上电或者由于光纤抖动等原因造成时 延变化时, 其时延值会上报给 BBU, BBU存储并计算其时延补偿。 当 RRU收到 BBU 计算的两个方向的新的时延补偿值后, 时延设置模块会根据目前光口的主备状态来设 置该补偿值, 使时延补偿生效。 RRU断链倒换后的时延切换: 当 RRU断链且主备光口倒换后, 需要用另一方向 上的补偿值重新设置其时延补偿。 比如, 如果环网的某 RRU正常运行时, 其主光口是 光口 0, 用的是正向时延补偿值, 当该 RRU的 0号光口断链时, 其主光口切换为 1号 光口, 则需要用反向时延值进行补偿。 为保证时延的快速切换, 倒换时的时延设置由 固件完成。 3 ) 断链倒换
RRU环网的链路状态可以分为正常和断链两种状态,见图 5中的正常环网和断链 环网。 断链环网又可以分为两种情况: 上 /下行 (前反向)光纤断链 (图中断链点 1和
2) 和 RRU器件断链一即 RRU物理硬件原因引发的断链 (图中断链点 3 )。 由于采用应用软件定时检测或者由 BBU/RRU单方面统一控制都无法满足快速倒 换的要求, 因此, 本发明采用 BBU和 RRU固件自检测、 自倒换的方式, 实现 RRU 环网断链时的网络自适应和平滑过渡。
RRU环网断链倒换如图 6所示,结合图 5:当 RRU#2与 RRU#3之间断链时, RRU#2 通过 LOOPTEST检测到其正向链路断路, 由于 RRU#2位于断链点的 BBU主光口(P1 口) 一侧, 因此无需倒换 (RRU#1类似); RRU#3通过 LOOPTEST会检测到其反向 的链路断链, 由于 RRU#3位于断链点的 BBU备光口 (P2口) 一侧, 因此需要倒换, 此时, 由该 RRU固件发起光口倒换, 原来的备光口倒换为主光口, 原来的主光口倒换 为备光口(RRU#4类似)。当 BBU主光口通过 LOOPTEST检测到 RRU环网有断链时, 不切换光口; 当 BBU备光口通过 LOOPTEST检测到 RRU环网有断链时, 切换备光 口为主光口。 倒换完成后的链路见图 5中的断链环网部分。 RRU的光口倒换完成后, RRU固件利用下发的原反向时延补偿值作为新的时延补偿值, 进行重新设置。 当所有 需要倒换的 RRU都倒换完成后,环网链路再次进入稳定状态。由于整个过程无需人工 干预, 都由断链倒换模块的固件自动完成, 最大限度地降低了倒换时间, 用户感受不 到业务的中断, 从而实现网络自适应和平滑过渡。 下面结合附图及实施例对本发明作进一步详细的描述: 如图 5所示, 配置 4个 RRU组成的环网, 只在某个 RRU ( RRU#2或者 RRU#3 ) 上配置相应的扇区, 配置 P1为主光口, P2为备光口。 当 BBU各单板、 各 RRU都正常上电后, RRU上报其器件时延。 BBU收到 RRU 的器件时延后, 计算其光纤时延并存储在数据库中。 同时, 计算该 RRU的光纤时延补 偿值并下发给该 RRU。
RRU收到 BBU发来的光纤时延补偿时, 根据 RRU光口主备状态选择正向 /反向 时延补偿进行设置。 此时, 能够正常打通电话。 在正常通话的情况下, 制造 RRU#2 与 RRU#3 之间的光纤断链的场景。 此时 RRU#3、 RRU#2原来的备光口倒换为主光口, 原来的主光口倒换为备光口, 且采用原 反向时延补偿值作为新的时延补偿值进程设置, BBU备光口切换为主光口, 链路恢复 正常。 整个过程中, 通话正常进行。 实施例 2 图 7是根据本发明实施例的链路倒换装置的一种优选结构图,其位于 RRU上,该 链路倒换装置包括: 传输单元 702, 设置为在 RRU环网链路正常时接收来自 BBU的 两个方向的传输链路的时延补偿值; 倒换单元 704, 连接至传输单元 702, 设置为在 RRU环网链路断链而进行倒换时将倒换前使用的一个方向的时延补偿值切换到倒换 后使用的另一个方向的时延补偿值。 在本优选的实施例中, 通过在链路断链之前将用于链路倒换的时延补偿值发送给 RRU, 从而在发生链路倒换时不需要花费时间对时延补偿值进行重新计算和传输, 而 是直接可以使用时延补偿值进行倒换, 这样保证了业务的不间断运行, 解决了现有技 术中所存在的无法保证业务不间断运行的问题。 传输单元 702通过以下步骤接收来自 BBU的两个方向的传输链路的时延补偿值: 在 RRU环网链路正常时, BBU接收 RRU的传输单元 702上报的 RRU的器件时延; BBU根据 RRU的器件时延以及检测到的光纤链路时延计算两个方向的传输链路的时 延补偿值; BBU将两个方向的传输链路的时延补偿值发送给 RRU。 优选的, RRU的传输单元 702在上电时将器件时延上报给 BBU。 优选的, 若时延补偿值发生改变, BBU将改变后的时延补偿值发送给 RRU的传 输单元 702。 链路倒换装置还包括: 检测单元 706, 连接至倒换单元 704, 设置为通过固化在 RRU的硬件中的检测程序来检测 RRU环网是否出现链路断链。 在 RRU通过固化在硬件中的检测程序来检测 RRU环网是否出现链路断链时, BBU通过固化在硬件中的检测程序来检测 RRU环网是否出现链路断链;若 BBU检测 RRU环网出现链路断链, 则 BBU进行自身的光口的倒换。 传输单元 702包括: 发送模块 7021, 设置为在上电时将器件时延上报给 BBU; 接 收模块 7022,设置为在 RRU环网链路正常时接收来自 BBU的两个方向的传输链路的 时延补偿值, 其中, 时延补偿值由 BBU根据 RRU的器件时延以及检测到的光纤链路 时延计算得到。 本优选实施例中的时延补偿值包括不同光口的时延补偿值, 这样, RRU的倒换单 元 704通过以下步骤来使用时延补偿值进行链路倒换: RRU确定链路倒换后所使用的 光口; RRU使用光口对应的时延补偿值进行倒换时延设置; RRU根据倒换时延设置 进行链路倒换。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种链路倒换方法, 包括:
在 RRU环网链路正常时,所述 RRU环网中的 RRU接收来自 BBU的两个 方向的传输链路的时延补偿值;
在所述 RRU环网链路断链而进行倒换时, 所述 RRU将倒换前使用的一个 方向的时延补偿值切换到倒换后使用的另一个方向的时延补偿值。
2. 根据权利要求 1所述的方法, 其中, 所述 RRU环网中的 RRU接收来自 BBU 的两个方向的传输链路的时延补偿值的步骤包括: 在 RRU环网链路正常时,所述 BBU接收所述 RRU上报的所述 RRU的器 件时延;
所述 BBU根据所述 RRU的器件时延以及检测到的光纤链路时延计算所述 两个方向的传输链路的时延补偿值;
所述 BBU将所述两个方向的传输链路的时延补偿值发送给所述 RRU。
3. 根据权利要求 2所述的方法, 其中, 所述 BBU接收所述 RRU上报的所述 RRU 的器件时延的步骤包括:
所述 RRU在上电时将所述器件时延上报给所述 BBU。
4. 根据权利要求 1所述的方法, 其中, 所述 RRU环网中的 RRU接收来自 BBU 的两个方向的传输链路的时延补偿值的步骤包括: 若所述时延补偿值发生改变, 所述 BBU将改变后的时延补偿值发送给所 述 RRU。
5. 根据权利要求 1所述的方法, 其中, 所述 RRU通过固化在硬件中的检测程序 来检测所述 RRU环网是否出现链路断链。
6. 根据权利要求 5所述的方法, 其中, 在所述 RRU通过固化在硬件中的检测程 序来检测所述 RRU环网是否出现链路断链时, 还包括:
所述 BBU通过固化在硬件中的检测程序来检测所述 RRU环网是否出现链 路断链; 若所述 BBU检测所述 RRU环网出现链路断链, 则所述 BBU进行自身的 光口的倒换。
7. 根据权利要求 1所述的方法, 其中, 所述时延补偿值包括不同光口的时延补偿 值, 其中, 所述 RRU将倒换前使用的一个方向的时延补偿值切换到倒换后使 用的另一个方向的时延补偿值的步骤包括:
所述 RRU确定链路倒换后所使用的光口;
所述 RRU使用所述光口对应的时延补偿值进行倒换时延设置; 所述 RRU根据倒换时延设置进行链路倒换。
8. 一种链路倒换装置, 位于 RRU上, 包括:
传输单元, 设置为在 RRU环网链路正常时接收来自 BBU的两个方向的传 输链路的时延补偿值;
倒换单元, 设置为在所述 RRU环网链路断链而进行倒换时将倒换前使用 的一个方向的时延补偿值切换到倒换后使用的另一个方向的时延补偿值。
9. 根据权利要求 8所述的装置, 其中, 该链路倒换装置还包括:
检测单元, 设置为通过固化在所述 RRU 的硬件中的检测程序来检测所述 RRU环网是否出现链路断链。
10. 根据权利要求 8所述的装置, 其中, 传输单元包括:
发送模块, 设置为在上电时将所述器件时延上报给所述 BBU; 接收模块, 设置为在 RRU环网链路正常时接收来自 BBU的两个方向的传 输链路的时延补偿值, 其中, 所述时延补偿值由所述 BBU根据所述 RRU的器 件时延以及检测到的光纤链路时延计算得到。
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