WO2010133152A1 - 远端射频单元发现及拓扑结构建立***及方法 - Google Patents

远端射频单元发现及拓扑结构建立***及方法 Download PDF

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Publication number
WO2010133152A1
WO2010133152A1 PCT/CN2010/072792 CN2010072792W WO2010133152A1 WO 2010133152 A1 WO2010133152 A1 WO 2010133152A1 CN 2010072792 W CN2010072792 W CN 2010072792W WO 2010133152 A1 WO2010133152 A1 WO 2010133152A1
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Prior art keywords
radio unit
remote radio
rru
message
stages
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PCT/CN2010/072792
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English (en)
French (fr)
Inventor
赵庆元
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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 JP2012511133A priority Critical patent/JP5367163B2/ja
Priority to AU2010251606A priority patent/AU2010251606B2/en
Priority to US13/320,824 priority patent/US20120063361A1/en
Priority to EP10777355.8A priority patent/EP2434831A4/en
Publication of WO2010133152A1 publication Critical patent/WO2010133152A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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

Definitions

  • the present invention relates to a wireless communication system, and more particularly to a radio frequency unit (RRU) self-discovery and topology structure self-establishment system and method in a wireless communication system.
  • RRU radio frequency unit
  • the mainstream deployment architecture of the wireless communication system is that the baseband unit (BBU) and the radio unit are separated, and the medium is connected through the optical fiber, and a series of messages are used for communication, as shown in FIG.
  • the connection between the RRU and the RRU that is, the topology structure
  • the BBU can know the existence of the RRU, and then communicate with the RRU, RRU. In order to work properly. If the topology of the RRU changes, you need to modify the original configuration on the NMS.
  • the technical problem to be solved by the present invention is to provide a system and method for self-establishing RRU self-discovery and topology structure, and realizing the self-establishment of the RRU topology structure when the BBU and the RRU are deployed separately.
  • the present invention provides a remote radio unit discovery and topology structure establishment method, including: after the baseband pool is started, sending a remote radio unit discovery message to the link connecting the remote radio unit, where The number of stages of the remote radio unit is set to a minimum value; the remote radio unit that receives the remote radio unit discovery message stores the number of stages therein, and the remote radio unit discovers the message. After the number of levels is increased by 1, the remote radio unit discovery message is sent to the next-level remote radio unit connected to the remote radio unit; the remote radio unit after the number of stages is learned. The level is fed back to the baseband pool to implement self-discovery of the remote radio unit and self-establishment of the topology structure.
  • the method further includes: the baseband pool periodically transmitting a detection message to a remote radio unit link;
  • the step of the remote radio unit after the learned sequence is fed back to the baseband pool includes: the remote radio unit receiving the detection message forwards the detection message to the next-level remote radio unit connected thereto, And transmitting, by the remote radio unit connected to the base station, the detection response to the baseband pool, and carrying the saved number of stages; the method further includes: after the baseband pool receives the detection response, if the number of stages is In addition, the remote radio unit corresponding to the number of stages is added to the remote radio unit connection relationship.
  • the step of the remote radio unit after the learned level is fed back to the baseband pool includes: the remote radio unit receives the remote radio unit discovery message, and then connects to the remote radio unit of the upper level
  • the baseband pool transparently transmits a notification message, carrying the number of levels it saves;
  • the method further includes: after the baseband pool receives the notification message, if the number of the levels is new, the remote radio unit corresponding to the number of stages is added to the remote radio unit connection relationship.
  • the method further includes: if the baseband pool does not receive a detection response or a notification message sent by a remote radio unit of a known level in the remote radio unit connection relationship within a preset time, The remote radio unit is deleted from the remote radio unit connection relationship.
  • the sending the remote radio unit discovery message includes: the baseband pool periodically sending the remote radio unit discovery message;
  • the remote radio unit discovery message uses the RRU_Index field to indicate the level of the remote radio unit, and the value of the RRU_Index field is set to i, indicating that the remote radio unit is the i+1th level.
  • the present invention also provides a system for establishing a remote radio unit and a topology structure, including: a baseband pool and a remote radio unit; and one or more remote radio units.
  • the baseband pool is configured to: after the startup, send a remote radio unit discovery message to the link connecting the remote radio unit, where the number of the remote radio unit is carried, and the number of stages is set to a minimum value;
  • the remote radio unit is configured to: save the number of stages after receiving the remote radio unit discovery message, and add 1 to the remote radio unit discovery message to the remote radio unit.
  • the discovery message is sent to the next-level remote radio unit connected to it, and the number of stages is fed back to the baseband pool to realize self-discovery of the remote radio unit and self-establishment of the topology structure.
  • the baseband pool is further configured to: periodically send a detection message to the link connecting the remote radio unit, and receive the detection response, and if the number of stages carried by the detection response is new, the connection relationship at the remote radio unit Adding a remote radio unit corresponding to the number of stages;
  • the remote radio unit is further configured to: after receiving the detection message, forwarding it to the next-level remote radio unit connected thereto;
  • the remote radio unit is configured to feed back its series to the baseband pool in the following manner:
  • the remote radio unit with the number i receives the detection message and returns a detection response to the upper-level remote radio unit connected thereto. Carrying the saved number of stages; and transparently transmitting the received detection response to the upper-level remote radio unit connected thereto, 2 in;
  • the remote radio unit After receiving the detection message, the remote radio unit with a sequence of 1 returns a detection response to the baseband pool, carries the number of levels saved, and transparently transmits the received detection response to the baseband pool.
  • the remote radio unit is configured to feed back its series to the baseband pool in the following manner:
  • the remote radio unit with the number i receives the remote radio unit discovery message and then connects to the upper-level remote radio
  • the unit sends a notification message, carries the number of levels it saves; and transparently transmits the received notification message to the remote radio unit connected to it, 2 in;
  • the remote radio unit of level 1 After receiving the remote radio unit discovery message, the remote radio unit of level 1 sends a notification message to the baseband pool, carries the number of levels saved, and transparently transmits the received notification message to the baseband pool.
  • the baseband pool is further configured to: after receiving the notification message, if the number of the levels is new, add the remote radio unit of the corresponding level to the remote radio unit connection relationship.
  • the baseband pool is further configured to: if the detection response or the notification message sent by the remote radio unit of the known level in the remote radio unit connection relationship is not received within the preset time, the remote radio frequency of the series is The unit is removed from the remote radio unit connection relationship.
  • the baseband pool is configured to send the remote radio unit discovery message in the following manner: Transmitting the remote radio unit discovery message periodically;
  • the remote radio unit discovery message uses the RRU_Index field to indicate the level of the remote radio unit, and the value of the RRU_Index field is set to i, indicating that the remote radio unit is the i+1th level.
  • the present invention provides a self-established system and method for RRU self-discovery and topology structure, which realizes self-establishment of RRU topology structure when BBU and RRU are deployed separately, reduces manual intervention on the network, and reduces The network maintenance cost complies with the development trend of wireless network management.
  • the solution of the present invention is applicable to wireless communication systems such as LTE. BRIEF abstract
  • Figure 1 is a connection diagram of BBU and RRU
  • Figure 2 is a flow chart showing the implementation of the method of the present invention.
  • FIG. 3 is a flow chart of Embodiment 1 of the present invention.
  • the present invention provides a self-established system and a method for self-establishing a RRU.
  • the baseband pool After the baseband pool is started, it sends a discovery message to the remote radio unit link, which carries the number of stages of the remote radio unit, and sets the number of stages. The minimum value is obtained by the remote radio unit that receives the discovery message, and the number of levels in the discovery message is increased by one, and then the discovery message is sent to the next-level remote radio unit connected thereto.
  • the remote radio unit after learning the series feeds the series back to the baseband pool.
  • the embodiment provides a system for self-discovery and topology of the RRU, as shown in FIG. 1 , including a BBU and one or more RRUs.
  • the BRU is connected to the RRU connected to it through the optical fiber, and the adjacent RRUs are also connected through the optical fiber.
  • the BBU is configured to send an RRU_Index (RRU Discovery) message to the link connecting the RRU, where the message includes a field indicating the RRU level, such as the RRU_Index, and the BBU will indicate the number of stages when sending the RRU_Index message.
  • RRU_Index RRU Discovery
  • the BBU may be further configured to send a detection message to the link connecting the RRU, and the detection message may be sent periodically; and receive the detection response returned by the RRU, and add the RRU to the corresponding location of the RRU connection relationship according to the number of stages in the detection response. on;
  • the BBU can also be used to receive the notification message sent by the RRU, and add the RRU to the corresponding location of the RRU connection relationship according to the number of stages;
  • the BBU is also used to delete the RRU from the RRU connection relationship after receiving the detection response or notification message sent by a certain RRU in the RRU connection relationship within the preset time.
  • the RRU is used to receive an RRU discovery message (such as RRU_Index) through the optical fiber, and save the number of stages therein.
  • RRU_Index field is i
  • the number of levels in which the RRU_Index field is saved is i+1, and is also used to represent The field of the series plus 1 sends an RRU_Index message to the next-level RRU connected to it. Therefore, the first RRU that receives the RRU_Index message has a RRU Index field value of 0, and the RRU has a rank of 1, and the second RRU receives the RRU_Index message, and the RRU_Index field value is 1. Then, the number of the RRU is 2, and so on. In the chain, the n+1th RRU that receives the RRU_Index message, and the RRU Index field value is n, the number of the RRU is n+1.
  • the RRU of the order i is also used to receive the detection message and return the detection response to the upper-level RRU (ie, the RRU sent the detection message) connected thereto, carrying the number of levels saved; and the detection response to be received Pass through to the upper level RRU connected to it, 2 ⁇ i ⁇ n;
  • the RRU of level 1 is also used to return a detection response to the baseband pool after receiving the detection message, carrying the number of levels saved, and transparently transmitting the received detection response to the BBU.
  • the RRU of the level i may also be used to send a notification message to the upper-level RRU connected thereto after receiving the RRU discovery message, carrying the number of levels saved; and transparently transmitting the received notification message to the connected Upper level RRU, 2 ⁇ i ⁇ n;
  • the RRU of the level 1 can also be used to send a notification message to the BBU after receiving the RRU discovery message, carrying the number of levels saved by the RRU, and transparently transmitting the received notification message to the BBU.
  • Step 201 After starting, the BBU sends an RRU discovery message (such as an RRU Index) to the link connecting the RRU, where the message includes a field indicating the RRU level, such as an RRU_Index, and the BBU sends an RRU_Index message to indicate
  • RRU discovery message such as an RRU Index
  • the BBU sends an RRU_Index message to indicate
  • the field of the series is set to a minimum value, for example, the RRU_Index field can be set to 0 to indicate the first level; the RRU_Index message can be sent periodically.
  • the RRU discovery message can also be replaced by a control word with the same function or by other means.
  • Step 202 The RRU that receives the RRU_Index message acquires and saves the number of stages, for example, when the value of the RRU Index field is i, saves the number of levels it is i+1, and sends the RRU_Index message to Connect the next level RRU, and increase the value of the RRU_Index field by 1;
  • the RRU_Index field value obtained by the first RRU receiving the RRU_Index message is 0, and the number of stages is 1, and the second RRU_Index field obtained by the RRU receiving the RRU_Index message is obtained. If the value is 1, the number of stages is 2, and so on.
  • the n+1th RRU that receives the RRU Index message in the chain, and the obtained RRU_Index field value is n, then the number of the RRU is n. +l.
  • Step 203a The BBU sends a detection message to the link connecting the RRU, and the detection message may be sent periodically.
  • the RRU that receives the detection message returns a detection response to the BBU, where the number of stages is carried; the detection response is connected thereto.
  • the upper level RRU is transparently transmitted to the BBU.
  • Step 203b After receiving the RRU discovery RRU message, the RRU actively sends a notification message to the BBU, where the number of levels is carried, and the notification message may be sent periodically; the notification message is transmitted through the upper-level RRU connected thereto. Pass to the BBU.
  • Step 204 After the BBU receives the detection response or the notification message, if the number of stages is new
  • the RRU of the corresponding number of stages is added to the RRU connection relationship.
  • the BRU If the BBU does not receive the detection response or notification message sent by the RRU of a known number of RRUs in the RRU, the BRU considers that the RRU has been deleted from the RRU connection relationship data to form a new one. The RRU connects the topology. The RRU after the RRU cannot be forwarded to the BBU because of the sent message, so it will also be deleted.
  • Step 301 The BBU periodically sends an RRU_Index message to the link connecting the RRU after the startup, and the RRU_Index message includes an RRU_Index field.
  • the RRU_Index field value is 0, and the RRU1 in the chain receives
  • the value of this field is 0, indicating that it is at level 1.
  • RRU1 adds RRU_Index to 1 and continues to send to RRU2.
  • RRU2 receives the value of this field is 1, indicating that it is at level 2, plus one.
  • RRU3 receives the value of this field is 2, indicating that they are at level 3.
  • Step 302 The BBU periodically sends an RRU detection message to the link connecting the RRU.
  • Step 303 The RRU1 receives the detection message sent by the BBU, forwards the message to the RRU2, and sends a response response to the BBU.
  • the message includes the location of the link acquired in the first step, that is, the first time is the first. Level RRU.
  • Step 304 The RRU2 receives the detection message of the BBU forwarded by the RRU1, forwards the message to the RRU3, and sends a response response to the BBU.
  • the message includes the location of the link acquired in the first step, that is, the self is Level 2 RRU.
  • Step 305 The RRU3 receives the detection message of the BBU forwarded by the RRU2, and responds to the BBU with the detection response.
  • the message includes the location of the link acquired in the first step, that is, the third-level RRU.
  • Step 306 After receiving the RRU detection response, the BBU considers that the RRU is newly added after receiving the detection response of the RRU for the first time, and adds the RRU to the RRU connection as shown in FIG. 1 according to the RRU location.
  • the RRU connection topology can be formed.
  • the RRU is deleted from the RRU connection relationship data to form a new RRU connection topology.
  • Step 401 The BBU periodically sends an RRU_Index message to the link connecting the RRU after the startup, and the RRU_Index message includes an RRU_Index field.
  • the RRU_Index field value is 0, and the RRU1 in the chain receives
  • the value of this field is 0, indicating that it is at level 1
  • RRU1 adds RRU_Index to 1 and continues to send to RRU2.
  • RRU2 receives The value of this field is 1, indicating that it is at level 2. After adding 1 and continuing to transfer to RRU3, RRU3 receives the value of this field is 2, indicating that it is at level 3.
  • Step 402 After obtaining the level in the chain, the RRU1 periodically sends a notification message to the BBU, and the message includes the location of the link acquired in the first step, that is, the first level RRU.
  • Step 403 After obtaining the level in the chain, the RRU2 periodically sends a message to the BBU, and the message includes the location of the link acquired in the first step, that is, the second level RRU.
  • Step 404 After obtaining the level in the chain, the RRU3 periodically sends a message to the BBU, and the message includes the location of the link acquired in the first step, that is, the third level RRU.
  • Step 405 After receiving the RRU message, if the BBU receives the message of the RRU for the first time, it considers that the RRU is new, and adds it to the RRU connection database table as shown in FIG. 1 according to the RRU location. In the middle, the RRU connection topology can be formed.
  • the RRU If the BBU does not receive a message from an RRU in the chain, the RRU is considered to have been deleted from the RRU connection database table. The RRU after the RRU cannot be forwarded to the BBU because the message is sent. Therefore, it will also be deleted), forming a new RRU connection topology.
  • the solution of the invention is applicable to a wireless communication system, such as LTE, which realizes self-establishment of the RRU topology structure when the BBU and the RRU are deployed separately, reduces manual intervention on the network, reduces network maintenance cost, and conforms to the development trend of the wireless network management. .

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Abstract

本发明提供了一种远端射频单元发现及拓扑结构建立的***及方法，包括：基带池在启动后向远端射频单元链路发送远端射频单元发现消息，其中携带远端射频单元的级数，并将级数设置为最小值，收到所述发送消息的远端射频单元保存其中的级数，并将远端射频单元发现消息中的级数加1后将所述远端射频单元发现消息发送至与之相连的下一级远端射频单元；获知级数后的远端射频单元将级数反馈给基带池。采用本发明方案，实现了基带池与远端射频单元分离部署时远端射频单元拓扑结构的自建立，减少了人工对 网络的干预,降低了网络维护成本，顺应了无线网络管理的发展趋势。

Description

远端射频单元发现及拓朴结构建立***及方法
技术领域
本发明涉及无线通讯***， 特别涉及无线通信***中射频单元（RRU ) 自发现及拓朴结构自建立***及方法。
背景技术
目前无线通讯***的主流部署架构就是基带池（ Base Band Unit, BBU ) 和射频单元分离， 中间通过光纤连接， 使用一系列的消息进行通讯， 如图 1 所示。 在这种情况下， 按照传统的网络管理方法， 必须在网管上人工添加 RRU以及 RRU的连接情况（即拓朴结构 ) , BBU才能知道 RRU的存在， 才 会和 RRU之间进行消息通讯， RRU才能正常工作。 如果 RRU的拓朴结构发 生变化， 还需要在网管上对原来的配置进行修改。
第三代移动通信长期演进（ Long Term Evolution, LTE ) ***中， 引入 了一种全新的网络管理理念——自组织网络（ SON ) , SON的核心思想是尽 可能减少人工对网络的干预， 能够做到***的自发现， 也就是 "即插即用" ， 上面介绍的现有基带池和射频单元的网络管理方法显然与 SON自发现、 自适 应的思想背道而驰。 发明内容
本发明要解决的技术问题是提供一种 RRU 自发现及拓朴结构自建立的 ***及方法， 实现了 BBU与 RRU分离部署时 RRU拓朴结构的自建立。
为了解决上述问题， 本发明提供了一种远端射频单元发现及拓朴结构建 立的方法， 包括： 基带池在启动后向连接远端射频单元的链路发送远端射频 单元发现消息， 其中携带远端射频单元的级数， 并将该级数设置为最小值； 收到所述远端射频单元发现消息的远端射频单元保存其中的级数， 并将所述 远端射频单元发现消息中的级数加 1后将所述远端射频单元发现消息发送至 与所述远端射频单元相连的下一级远端射频单元； 获知级数后的远端射频单 元将级数反馈给所述基带池； 以实现远端射频单元的自发现及拓朴结构的自 建立。
所述方法还包括： 所述基带池周期性地向远端射频单元链路发送检测消 息；
所述获知级数后的远端射频单元将级数反馈给所述基带池的步骤包括： 收到检测消息的远端射频单元将检测消息转发至与之相连的下一级远端射频 单元， 并通过与之相连的上一级远端射频单元向基带池透传检测响应， 携带 其保存的级数； 所述方法还包括： 所述基带池收到检测响应后， 如果其中的级数为新增 的， 则在远端射频单元连接关系中增加对应级数的远端射频单元。
所述获知级数后的远端射频单元将级数反馈给基带池的步骤包括： 所述远端射频单元收到远端射频单元发现消息后通过与之相连的上一级 远端射频单元向基带池透传通知消息， 携带其保存的级数；
所述方法还包括： 所述基带池收到通知消息后， 如果其中的级数为新增 的， 则在远端射频单元连接关系中增加对应级数的远端射频单元。
所述方法还包括： 所述基带池若在预设时间内未收到远端射频单元连接 关系中已知级数的远端射频单元发来的检测响应或通知消息， 则将该级数的 远端射频单元从所述远端射频单元连接关系中删除。
所述发送远端射频单元发现消息的步骤包括： 所述基带池周期性地发送 所述远端射频单元发现消息； 以及
所述远端射频单元发现消息中用 RRU— Index字段表示远端射频单元的级 数， 将所述 RRU— Index字段的值置为 i表示远端射频单元为第 i+1级。
本发明还提供一种远端射频单元发现及拓朴结构建立的***， 包括： 基 带池与远端射频单元； 远端射频单元为一个或多个，
所述基带池设置为： 在启动后向连接远端射频单元的链路发送远端射频 单元发现消息， 其中携带远端射频单元的级数， 并将级数设置为最小值； 所述远端射频单元设置为： 收到所述远端射频单元发现消息后保存其中 的级数， 并将所述远端射频单元发现消息中的级数加 1后将所述远端射频单 元发现消息发送至与之相连的下一级远端射频单元，将其级数反馈给基带池； 以实现远端射频单元的自发现及拓朴结构的自建立。
所述基带池还设置为： 周期性地向连接远端射频单元的链路发送检测消 息， 以及接收检测响应， 如果检测响应所携带的级数为新增的， 则在远端射 频单元连接关系中增加对应级数的远端射频单元；
所述远端射频单元还设置为： 收到检测消息后将其转发至与之相连的下 一级远端射频单元；
所述远端射频单元是设置为以如下方式将其级数反馈给基带池： 级数为 i 的远端射频单元收到检测消息后向与之相连的上一级远端射频 单元返回检测响应， 携带其保存的级数； 并将收到的检测响应透传给与之相 连的上一级远端射频单元， 2 i n;
级数为 1的远端射频单元收到检测消息后向基带池返回检测响应， 携带 其保存的级数； 以及将接收到的检测响应透传给基带池。
所述远端射频单元是设置为以如下方式将其级数反馈给基带池： 级数为 i 的远端射频单元收到远端射频单元发现消息后向与之相连的上 一级远端射频单元发送通知消息， 携带其保存的级数； 并将收到的通知消息 透传给与之相连的上一级远端射频单元， 2 i n;
级数为 1的远端射频单元收到远端射频单元发现消息后向基带池发送通 知消息， 携带其保存的级数； 以及将收到的通知消息透传给基带池；
所述基带池还设置为： 收到通知消息后， 如果其中的级数为新增的， 则 在远端射频单元连接关系中增加对应级数的远端射频单元。
所述基带池还设置为： 在预设时间内未收到远端射频单元连接关系中已 知级数的远端射频单元发来的检测响应或通知消息， 则将该级数的远端射频 单元从所述远端射频单元连接关系中删除。
所述基带池是设置为以如下方式发送所述远端射频单元发现消息： 周期性地发送所述远端射频单元发现消息；
所述远端射频单元发现消息中用 RRU— Index字段表示远端射频单元的级 数， 将所述 RRU— Index字段的值置为 i表示远端射频单元为第 i+1级。
综上所述，本发明提供的一种 RRU自发现及拓朴结构自建立的***及方 法， 实现了 BBU与 RRU分离部署时 RRU拓朴结构的自建立，减少了人工对 网络的干预， 降低了网络维护成本， 顺应了无线网络管理的发展趋势。 本发 明方案适用于无线通讯***， 如 LTE。 附图概述
图 1是 BBU和 RRU连接图；
图 2是本发明方法实施流程图；
图 3是本发明实施例一的流程图；
图 4是本发明实施例二的流程图。 本发明的较佳实施方式
本发明提供一种 RRU自发现及拓朴结构自建立的***及方法，基带池在 启动后向远端射频单元链路发送发现消息， 其中携带远端射频单元的级数， 并将级数设置为最小值，收到所述发现消息的远端射频单元保存其中的级数， 并将发现消息中的级数加 1后将所述发现消息发送至与之相连的下一级远端 射频单元； 获知级数后的远端射频单元将级数反馈给基带池。
本实施例提供一种 RRU自发现及拓朴结构自建立的***， 如图 1所示， 包括 BBU、 一个或多个 RRU;
BBU同与之相连的 RRU通过光纤连接，相邻 RRU之间也通过光纤连接；
BBU用于向连接 RRU的链路发送 RRU— Index ( RRU发现 ) 消息， 该消 息包含一表示 RRU级数的字段，如可以是 RRU— Index, BBU发送 RRU— Index 消息时将表示级数的字段置为最小值， 如可以将 RRU— Index字段置为 0表示 第一级； RRU— Index消息可以是周期性地发送。 BBU还可以用于向连接 RRU的链路发送检测消息， 检测消息可以是周 期性地发送； 以及接收 RRU返回的检测响应 , 并根据检测响应中的级数将该 RRU添加到 RRU连接关系对应位置上；
BBU还可以用于接收 RRU发来的通知消息，并根据其中的级数将该 RRU 添加到 RRU连接关系对应位置上；
BBU还用于预设时间内未收到 RRU连接关系中某级 RRU发来的检测响 应或通知消息后， 将该 RRU从 RRU连接关系中删除。
RRU用于通过光纤接收 RRU发现消息 （如 RRU— Index ) , 保存其中的 级数， 若其中的 RRU— Index字段为 i, 则保存其所处的级数为 i+1 , 还用于将 表示级数的字段加 1向与之相连的下一级 RRU发送 RRU— Index消息。 因此， 第一个收到 RRU— Index消息的 RRU, RRU Index字段值为 0, 则该 RRU的 级数为 1 , 第二个收到 RRU— Index消息的 RRU, RRU— Index字段值为 1 , 则 该 RRU的级数为 2, 以此类推， 链中第 n+1个收到 RRU— Index消息的 RRU, RRU Index字段值为 n, 则该 RRU的级数为 n+1。
级数为 i的 RRU还用于收到检测消息后向与之相连的上一级 RRU(即发 来检测消息的 RRU )返回检测响应， 携带其保存的级数； 以及将收到的检测 响应透传给与之相连的上一级 RRU, 2 < i < n;
级数为 1的 RRU还用于收到检测消息后向基带池返回检测响应，携带其 保存的级数； 以及将收到的检测响应透传给 BBU。
级数为 i的 RRU还可以用于收到 RRU发现消息后向与之相连的上一级 RRU发送通知消息， 携带其保存的级数； 以及将收到的通知消息透传给与之 相连的上一级 RRU, 2 < i < n;
级数为 1的 RRU还可以用于收到 RRU发现消息后向 BBU发送通知消息， 携带其保存的级数； 以及将收到的通知消息透传给 BBU。
本实施例提供一种 RRU自发现及拓朴结构自建立的方法，该方法的步骤 下： 步骤 201 : BBU在启动后向连接 RRU的链路发送 RRU发现消息 （如 RRU Index ) , 该消息包含一表示 RRU级数的字段， 如可以是 RRU— Index, BBU 发送 RRU— Index 消息时将表示级数的字段置为最小值， 如可以将 RRU— Index字段置为 0表示第一级； RRU— Index消息可以是周期性地发送。
此处 RRU发现消息也可以用功能相同的控制字或者其它方式代替。
步骤 202: 收到 RRU— Index消息的 RRU获取并保存其中的级数， 如当 RRU Index字段值为 i时，保存其所处级数为 i+1 ,并将 RRU— Index消息发送 至与之相连的下一级 RRU, 将其中的 RRU— Index字段值加 1；
具体地 , 第一个收到 RRU— Index消息的 RRU获取的 RRU— Index字段值 为 0 , 则其所处级数为 1 , 第二个收到 RRU— Index 消息的 RRU 获取的 RRU— Index字段值为 1 , 则其所处级数为 2, 以此类推， 链中第 n+1个收到 RRU Index消息的 RRU, 获取的 RRU— Index字段值为 n, 则该 RRU的级数 为 n+l。
步骤 203a: BBU向连接 RRU的链路发送检测消息， 检测消息可以是周 期性地发送； 收到检测消息的 RRU向 BBU返回检测响应， 其中携带所处的 级数； 该检测响应通过与之相连的上一级 RRU透传给 BBU。
步骤 203b: 收到 RRU发现 RRU消息后的 RRU主动向 BBU发送通知消 息， 其中携带所处的级数， 该通知消息可以是周期性地发送； 该通知消息通 过与之相连的上一级 RRU透传给 BBU。
步骤 204: BBU收到检测响应或通知消息后， 如果其中的级数为新增的
(即第一次收到该级数的 RRU发来的消息） ， 则在 RRU连接关系中增加对 应级数的 RRU。
BBU若在预设时间内未收到 RRU连接关系中某个已知级数的 RRU发来 的检测响应或通知消息， 则认为该 RRU已经删除， 将其从 RRU连接关系数 据中删除，形成新的 RRU连接拓朴。该 RRU之后的 RRU因发送的消息不能 被转发至 BBU, 因此也会一并被删除
为了进一步说明本发明，下面以 3级 RRU为例对发明内容进行详细说明。 应用实例一， 如图 3所示：
步骤 301 : BBU在启动后周期性地向连接 RRU的链路发送 RRU— Index 消息， RRU— Index 消息包含一个 RRU— Index 字段， BBU发送该消息时 RRU— Index字段值为 0,链中 RRU1收到消息时该字段的值就是 0,表示自己 处于第 1级， 然后 RRU1将 RRU— Index加 1继续往 RRU2发送， RRU2收到 该字段的值就是 1 , 表示自己处于第 2级， 加 1后继续往 RRU3传送， RRU3 收到该字段的值就是 2, 表示自己处于第 3级。
步骤 302: BBU周期性地向连接 RRU的链路发送 RRU检测消息。
步骤 303： RRU1收到了 BBU发送的检测消息， 将该消息转发给 RRU2 , 并向 BBU回应检测响应， 消息要包含在第 1步获取的自己在链路上的位置， 也就是说明自己是第 1级 RRU。
步骤 304: RRU2收到了 RRU1转发的 BBU的检测消息， 将该消息转发 给 RRU3 , 并向 BBU回应检测响应， 消息要包含在第 1步获取的自己在链路 上的位置， 也就是说明自己是第 2级 RRU。
步骤 305: RRU3收到了 RRU2转发的 BBU的检测消息， 向 BBU回应检 测响应， 消息要包含在第 1步获取的自己在链路上的位置， 也就是说明自己 是第 3级 RRU。
步骤 306: BBU收到 RRU的检测响应后， 如果是第一次收到某个 RRU 的检测响应， 即认为该 RRU是新增的， 根据 RRU位置将其添加到如图 1所 示的 RRU连接关系数据中， RRU的连接拓朴就可以形成了。
如果预设时间内 BBU都没有收到链中某个 RRU的检测响应， 即认为该 RRU已经删除，将其从 RRU连接关系数据中删除，形成新的 RRU连接拓朴。
应用实例二， 如图 4所示：
步骤 401： BBU在启动后周期性地向连接 RRU的链路发送 RRU— Index 消息， RRU— Index 消息包含一个 RRU— Index 字段， BBU发送该消息时 RRU— Index字段值为 0,链中 RRU1收到消息时该字段的值就是 0,表示自己 处于第 1级， 然后 RRU1将 RRU— Index加 1继续往 RRU2发送， RRU2收到 该字段的值就是 1 , 表示自己处于第 2级， 加 1后继续往 RRU3传送， RRU3 收到该字段的值就是 2, 表示自己处于第 3级。
步骤 402: RRU1获取自己在链中的级别后， 周期性向 BBU发送通知消 息， 消息要包含在第 1步获取的自己在链路上的位置， 也就是说明自己是第 1级 RRU„
步骤 403: RRU2获取自己在链中的级别后， 周期性向 BBU发送消息， 消息要包含在第 1步获取的自己在链路上的位置， 也就是说明自己是第 2级 RRU„
步骤 404: RRU3获取自己在链中的级别后， 周期性向 BBU发送消息， 消息要包含在第 1步获取的自己在链路上的位置， 也就是说明自己是第 3级 RRU„
步骤 405： BBU收到 RRU的消息后， 如果是第一次收到某个 RRU的消 息， 即认为该 RRU是新增的， 根据 RRU位置将其添加到如图 1所示的 RRU 连接数据库表中， RRU的连接拓朴就可以形成了。
如果预设时间内 BBU都没有收到链中某个 RRU的消息， 即认为该 RRU 已经删除，将其从 RRU连接数据库表中删除（该 RRU之后的 RRU因发送的 消息不能被转发至 BBU, 因此也会一并被删除） ， 形成新的 RRU连接拓朴。
工业实用性
本发明方案适用于无线通讯***， 如 LTE, 实现了 BBU与 RRU分离部 署时 RRU拓朴结构的自建立， 减少了人工对网络的干预， 降低了网络维护成 本， 顺应了无线网络管理的发展趋势。

Claims

权 利 要 求 书
1、 一种远端射频单元发现及拓朴结构建立的方法， 其包括：
基带池在启动后向连接远端射频单元的链路发送远端射频单元发现消 息， 其中携带远端射频单元的级数， 并将该级数设置为最小值；
收到所述远端射频单元发现消息的远端射频单元保存其中的级数， 并将 所述远端射频单元发现消息中的级数加 1后将所述远端射频单元发现消息发 送至与所述远端射频单元相连的下一级远端射频单元； 以及
获知级数后的远端射频单元将级数反馈给所述基带池；
以实现远端射频单元的自发现及拓朴结构的自建立。
2、 如权利要求 1所述的方法，
所述方法还包括： 所述基带池周期性地向远端射频单元链路发送检测消 息；
所述获知级数后的远端射频单元将级数反馈给所述基带池的步骤包括： 收到检测消息的远端射频单元将检测消息转发至与之相连的下一级远端射频 单元， 并通过与之相连的上一级远端射频单元向基带池透传检测响应， 携带 其保存的级数； 所述方法还包括： 所述基带池收到检测响应后， 如果其中的级数为新增 的， 则在远端射频单元连接关系中增加对应级数的远端射频单元。
3、 如权利要求 2所述的方法， 该方法还包括：
所述基带池若在预设时间内未收到远端射频单元连接关系中已知级数的 远端射频单元发来的检测响应， 则将该级数的远端射频单元从所述远端射频 单元连接关系中删除。
4、 如权利要求 1所述的方法， 其中，
所述获知级数后的远端射频单元将级数反馈给所述基带池的步骤包括： 所述远端射频单元收到远端射频单元发现消息后通过与之相连的上一级远端 射频单元向基带池透传通知消息， 携带其保存的级数； 所述方法还包括： 所述基带池收到通知消息后， 如果其中的级数为新增 的， 则在远端射频单元连接关系中增加对应级数的远端射频单元。
5、 如权利要求 4所述的方法， 该方法还包括：
所述基带池若在预设时间内未收到远端射频单元连接关系中已知级数的 远端射频单元发来的通知消息， 则将该级数的远端射频单元从所述远端射频 单元连接关系中删除。
6、 如权利要求 1所述的方法， 其中，
所述发送远端射频单元发现消息的步骤包括：
所述基带池周期性地发送所述远端射频单元发现消息； 以及
在所述远端射频单元发现消息中用远端射频单元发现（RRU— Index )字 段表示远端射频单元的级数， 将所述 RRU— Index字段的值置为 i表示远端射 频单元为第 i+1级。
7、 一种远端射频单元发现及拓朴结构建立的***， 包括：基带池与远端 射频单元， 所述远端射频单元为一个或多个；
所述基带池设置为： 在启动后向连接远端射频单元的链路发送远端射频 单元发现消息， 其中携带远端射频单元的级数， 并将级数设置为最小值； 所述远端射频单元设置为：
收到所述远端射频单元发现消息后保存其中的级数， 并将所述远端射频 单元发现消息中的级数加 1后将所述远端射频单元发现消息发送至与之相连 的下一级远端射频单元； 以及
将其级数反馈给基带池；
以实现远端射频单元的自发现及拓朴结构的自建立。
8、 如权利要求 7所述的***， 其中，
所述基带池还设置为： 周期性地向连接远端射频单元的链路发送检测消 息， 以及接收检测响应， 如果所述检测响应所携带的级数为新增的， 则在远 端射频单元连接关系中增加对应级数的远端射频单元； 所述远端射频单元还设置为： 收到检测消息后将其转发至与之相连的下 一级远端射频单元；
所述远端射频单元是设置为以如下方式将其级数反馈给基带池： 级数为 i 的远端射频单元收到检测消息后向与之相连的上一级远端射频 单元返回检测响应， 携带其保存的级数； 并将收到的检测响应透传给与之相 连的上一级远端射频单元， 2 i n;
级数为 1的远端射频单元收到检测消息后向基带池返回检测响应， 携带 其保存的级数； 以及将接收到的检测响应透传给基带池。
9、 如权利要求 9所述的***， 其中，
所述基带池还设置为： 在预设时间内未收到远端射频单元连接关系中已 知级数的远端射频单元发来的检测响应， 则将该级数的远端射频单元从所述 远端射频单元连接关系中删除。
10、 如权利要求 7所述的***， 其中， 所述远端射频单元是设置为以如 下方式将其级数反馈给基带池：
级数为 i 的远端射频单元收到远端射频单元发现消息后向与之相连的上 一级远端射频单元发送通知消息， 携带其保存的级数； 并将收到的通知消息 透传给与之相连的上一级远端射频单元， 2 i n;
级数为 1的远端射频单元收到远端射频单元发现消息后向基带池发送通 知消息， 携带其保存的级数； 以及将收到的通知消息透传给基带池；
所述基带池还设置为： 收到通知消息后， 如果其中的级数为新增的， 则 在远端射频单元连接关系中增加对应级数的远端射频单元。
11、 如权利要求 11所述的***， 其中，
所述基带池还设置为： 在预设时间内未收到远端射频单元连接关系中已 知级数的远端射频单元发来的通知消息， 则将该级数的远端射频单元从所述 远端射频单元连接关系中删除。
12、 如权利要求 7所述的***， 其中， 所述基带池是设置为以如下方式发送所述远端射频单元发现消息： 周期性地发送所述远端射频单元发现消息；
在所述远端射频单元发现消息中用远端射频单元发现（RRU— Index )字 段表示远端射频单元的级数， 将所述 RRU— Index字段的值置为 i表示远端射 频单元为第 i+1级。
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