CN102457874B

CN102457874B - A kind of method of maintaining communication equipment and network system

Info

Publication number: CN102457874B
Application number: CN201010519639.2A
Authority: CN
Inventors: 马骁; 谢健; 黄雪英
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-10-22
Filing date: 2010-10-22
Publication date: 2016-06-22
Anticipated expiration: 2030-10-22
Also published as: WO2012051895A1; CN102457874A

Abstract

The invention discloses a kind of method of maintaining communication equipment and network system, the method includes: network system increases webmaster background backup link；The base station controller that base station is connected with this base station preserves cell site topology relation table；If base station controller (RNC) detects the IUB link chain rupture of the base station being connected with this base station controller, then switch to webmaster backstage (OMCB) backup link according to cell site topology relation table and carry out communication；By method proposed by the invention and network system, can accomplish when IUB link chain rupture, still at central machine room, base station (NodeB) can be monitored and safeguard, Maintenance free personnel can investigate fault in upper station, on the other hand owing to webmaster back channel can be immediately switched to backup link, so when chain rupture, the fault message of base station can beam back monitoring backstage in time, position fault to developer and provide first hand field condition, reduce complexity, decrease operation cost。

Description

Method and network system for maintaining communication equipment

Technical Field

The present invention relates to the field of communications, and in particular, to a method and a network system for maintaining a communication device.

Background

In a mobile communication system, an operator generally performs centralized management on NodeB (base station, universal mobile telecommunications system, global system for mobile communications) by using an OMCB (operation network management background) in a central machine room of an RNC (radio network controller ), and then uses a TD-SCDMA (time division-synchronous code division multiple access) mobile system as an example to illustrate an application of an OMCB operation maintenance link backup in NodeB centralized management.

In the TD-SCDMA system, an RNC is usually located in a central office, and nodebs (including indoor baseband processing units (BBUs) and Radio Remote Units (RRUs)) are numerous and need to cover a wide area, so that the nodebs are usually located away from the central office by several kilometers or several tens of kilometers and are distributed relatively dispersedly, and it is very difficult to directly manage the nodebs, and therefore an operator usually manages numerous nodebs under one or more RNCs by operating maintenance channels through an OMCB in the central office. The disadvantage of this technique is that the segment of the OMCB operation maintenance channel from the RNC to the NodeB is carried on an IUB (interface between the base station and the UTRAN) link, and once the IUB interface is broken, the OMCB operation maintenance channel is broken, which further causes the network management background of the central computer room to be unable to access the broken NodeB. Whenever this happens, the NodeB becomes "island" and maintenance personnel cannot manage it and have to go to the station to handle the failure.

Disclosure of Invention

The invention provides a method and a system for maintaining communication equipment, which solve the problem that a base station is isolated after chain breakage and still can be controlled by an RNC (radio network controller), and reduce the problem of troubleshooting when maintenance personnel go to the station during the chain breakage.

The invention provides a method for maintaining communication equipment, which comprises the following steps:

a network system is added with a network management background backup link; the RNC which is connected with the base station and the base station saves a base station topological relation table; and if the RNC detects the IUB link of the base station connected with the RNC is broken, switching to an OMCB backup link according to the base station topological relation table for communication.

Further, the detecting, by the RNC, the IUB link disconnection of the base station connected to the RNC specifically includes: an operation maintenance channel of the base station connected to the RNC is broken or an OMCB keep-alive message of the base station connected to the RNC fails.

Further, when the network system is updated, the RNCs connected to the base station and the base station update the base station topology relationship tables stored in the RNCs.

Further, the switching to the OMCB backup link for communication specifically includes: the RNC searches a link according to the base station topological relation table; and the RNC initiates an OMCB backup link establishment process through the relay base station searched in the base station topological relation table, if the establishment is successful, the RNC switches to the backup link to transmit data, and if the establishment is failed, the RNC searches the link again and initiates the OMCB backup link establishment process.

Further, the above link search according to the base station topology relationship table specifically includes: and searching the link according to the minimum routing distance strategy.

Further, the process of initiating the OMCB backup link establishment by the RNC through the relay base station searched in the base station topology relationship table specifically includes: the RNC sends a backup link establishment request to the relay base station, the relay base station makes a decision according to whether a local link meets a preset link condition, and if the local link meets the preset link condition, an ACK (acknowledgement) is replied to the RNC; if not, replying NAK (backup link establishment rejection) to RNC;

the preset link condition is that the local resource of the local link is more than or equal to the space resource for storing the operation maintenance channel information of the relay base station and storing the route forwarding information of the target base station; the link bandwidth of the local link is more than or equal to the channel bandwidth for carrying the operation maintenance data of the base station of the relay base station and carrying the operation maintenance data of the target base station.

Further, when the RNC detects that the IUB link of the base station connected to the RNC is recovered to normal, the RNC is switched to the IUB link of the base station connected to the RNC for communication.

The invention also provides a network system, comprising: a base station, a base station controller and a network management background backup link; wherein,

the base station is used for storing a base station topological relation table;

the base station controller is used for storing a base station topological relation table; when the base station controller detects the IUB link of the base station is broken, the network management background backup link is switched to carry out communication.

Further, when the network system is updated, the base station and the base station controller update the base station topology relationship table stored in the base station topology relationship table.

Further, the network system further includes a relay base station;

the base station controller is specifically configured to perform link search according to the base station topology relation table, initiate an OMCB backup link establishment process through the relay base station searched in the base station topology relation table, switch to the backup link to transmit data if the establishment is successful, and perform link search again and initiate the OMCB backup link establishment process if the establishment is failed.

By the method and the network system provided by the invention, under the condition that IUB links are broken, the NodeB can be monitored and maintained in a central machine room, and the fault can be checked without the need of maintenance personnel to go to the station.

Drawings

FIG. 1 is a diagram of a network architecture of the present invention;

fig. 2 is an OMCB backup link establishment procedure of the present invention;

fig. 3 is a flow chart of the method of the present invention.

Detailed Description

The present invention provides a method for maintaining a communication device, as shown in fig. 3, the method includes: a network system is added with a network management background backup link; the base station controller connected with the base station saves a base station topological relation table; and if the RNC detects the IUB link of the base station connected with the RNC is broken, switching to an OMCB backup link according to the base station topological relation table for communication.

The relay base station and the base station mentioned herein are all the same type of devices, but the locations of the relay base station and the base station are different, as for the base station under the RNC1 in fig. 1, the BBU1, the BBU2 and the BBU3 are all part of the base station, the BBU1 establishes an operation maintenance link with the RNC1 background through the BBU2, and the BBU2 is part of the relay base station; the BBU1 establishes an operation maintenance link with the RNC1 background through the BBU2 and the BBU3, and both the BBU2 and the BBU3 are part of a relay base station; if a certain BBU directly establishes an operation maintenance link with the RNC background, no relay base station exists.

Further, the process of initiating the OMCB backup link establishment by the RNC through the relay base station searched in the base station topology relationship table specifically includes: the RNC sends a backup link establishment request to the relay base station, the relay base station makes a decision according to whether a local end link meets a preset link condition, and if the local end link meets the preset link condition, a backup link establishment acknowledgement ACK is replied to the RNC; if not, replying a backup link to the RNC to establish a link and reject NAK;

the preset link condition is that the local resource of the local link is more than or equal to the space resource for storing the operation maintenance channel information of the relay base station and storing the route forwarding information of the target base station; the link bandwidth of the local link is more than or equal to the channel bandwidth for carrying the operation maintenance data of the base station of the relay base station and carrying the operation maintenance data of the target base station. The destination base station is a next base station for forwarding information by the relay base station.

Herein, the home link refers to an operation maintenance channel of the relay base station itself; the local resources refer to some data areas, namely storage spaces and the like, opened up by the relay base station maintaining own links; the link bandwidth refers to the data carrying capacity of an operation maintenance channel of the relay base station; the enough local resources refer to that the storage space opened up by the relay base station can store the route forwarding information of the target base station in addition to the self operation maintenance channel information; the sufficient link bandwidth means that the operation and maintenance channel of the relay base station can carry operation and maintenance data of the target base station in addition to the operation and maintenance data of the base station.

Detailed description of the preferred embodiment

As shown in fig. 1, under the condition of not changing the existing network structure, a network independent of the IUB link transmission network is added between the nodebs, and the network connects the nodebs with each other, so as to achieve interconnection and interworking of the nodebs without the aid of IUB links, and this network is an OMCB backup link.

When a station is opened, a topology table of a network, that is, a base station topology table, is generated according to an identifier of a uniquely identified station (for example, a unique operation maintenance IP address previously assigned by each NodeB). The network topology table needs to be stored in both RNC and NodeB, or may be stored in other form of structure table, for example, a topology table is established according to a comparison relationship between a site MAC (media access control) address and an IP (internet protocol) address or according to an area identifier and an IP address, and a network manager introduces the table structures in various organization forms to the foreground through a background tool. The network topology table is a static topology structure for the whole network, namely, once the operator network is deployed, the position of the NodeB is substantially fixed, and according to this feature, a static topology structure table can be generated while the network is deployed, and the topology structure table records the relative connection relationship between the nodebs, and needs to be stored in both the RNC and the NodeB.

And as long as the position and the connection relation between NodeB sites are unchanged, the topological relation table does not need to be maintained again, thereby reducing the maintenance cost. If the network system changes, the topology tables stored in the RNC and NodeB need to be updated. As shown in the following table, which is a topology table stored in the RNC1 and the node b below the RNC1 in fig. 1, it can be seen from table 1 (topology table of BBU 1), table 2 (topology table of BBU 2), and table 3 (topology table of BBU 3) that 3 BBUs below the RNC1 are in a chain topology, and the maximum hop count is 2 hops.

TABLE 1

Source node	Destination node	Next hop node	Hop count
				BBU1	BBU2	BBU2	1
BBU1	BBU3	BBU2	2

TABLE 2

Source node	Destination node	Next hop node	Hop count
				BBU2	BBU1	BBU1	1
BBU2	BBU3	BBU3	1

TABLE 3

Source node	Destination node	Next hop node	Hop count
				BBU3	BBU1	BBU2	2
BBU3	BBU2	BBU2	1

Under normal conditions, the OMCB still goes through the original operation and maintenance channel, i.e., the OMCB operation and maintenance channel, i.e., each NodeB corresponds to its own IUB link, and keeps alive according to the original IUB link keep-alive mechanism (the keep-alive mechanism means that in a fixed time period, both ends of a link notify the availability of the link to the other side through a specific data packet, and any one of the links can initiate a link removal process if it does not receive a keep-alive data packet in the time period).

If the RNC detects the operation maintenance channel link-breaking of a certain base station or the keep-alive message of the OMCB of a certain BBU fails, the RNC considers that the IUB link directly connected to the BBU is broken. The IUB link disconnection also includes other forms of disconnection: control plane, user plane information transfer failure, etc. For example, the link of IUB1 corresponding to NodeB1 is broken, which results in that the original operation maintenance channel is not reachable, at this time, the RNC receives the operation maintenance data of BBU1 sent by the network management background to the broken link, and automatically searches for a backup link to BBU1 according to the stored topology table, where the optimal way is to search for the backup link with the smallest hop count; for example, find BBU2 is now 1 hop to BBU 1. Then a backup link establishment request is sent to the BBU2, after receiving the establishment request, the BBU2 checks the resource condition of itself, and if it has enough resources and link bandwidth, it replies a backup link establishment confirmation to the RNC (as shown in fig. 2); then, the RNC sends all the operation and maintenance data sent by the network management background to the BBU1 to the BBU 2.

Specifically, when the RNC detects the IUB link of the BBU is broken (the IUB link is broken using the original keep-alive mechanism of the system, and no additional link detection mechanism is needed for the present invention, so no additional overhead is caused to the system), for the downlink operation maintenance data, the RNC searches for a link according to the topology table and the minimum routing distance policy to find an available IUB link closest to the broken-link NodeB, and initiates an OMCB backup link establishment procedure, specifically, as shown in fig. 2, the RNC replies a backup link establishment request to the relay NodeB, the relay NodeB responds to the RNC according to its own link condition whether a link backup can be provided for the broken-link NodeB, if the relay NodeB has sufficient link resources and link bandwidth (meets the preset link condition), replies a backup link establishment acknowledgement ACK to the RNC, and at this time, the OMCB backup link is used to replace the original IUB link, the relay NodeB can correctly forward the OMCB data according to the topological structure table, so that the OMCB backup link channel is successfully switched; otherwise, if not, indicating that the establishment fails, replying a backup link establishment rejection NAK to the RNC, and carrying out link search again and initiating an OMCB backup link establishment process.

When the BBU2 receives the operation and maintenance data of the BBU1 sent by the RNC, and finds that the data is not sent to the BBU, the BBU2 queries the topology table, and after finding that the BBU1 is in a topological relationship with the BBU, forwards the packet to the BBU1 according to the entry.

When the RNC detects that the broken IUB link is recovered, the original operation maintenance link, namely the IUB link, is switched back to carry out communication.

If the operation maintenance backup link is an IP network, the topological structure table can be converted into a routing table, and the existing routing strategy can be adopted when the backup link is switched, so that the addressing can be directly carried out through the routing table. In the case of an ATM (asynchronous transfer mode) network, it is necessary to identify a link exchange relationship between base stations in a topology table, and the operation maintenance data is exchanged by means of ipoa (ipoveratm), that is, a technique for transmitting IP packets over an ATM-LAN.

the base station is used for storing a base station topological relation table;

Further, the network system further includes a relay base station;

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for maintaining communication equipment, the method comprising: the network system adds OMCB backup link of background of network management; the OMCB backup link is a network independent of IUB link transmission network between base stations NodeB under the condition of not changing the existing network structure, and the network connects the NodeB to achieve the interconnection of the NodeB without the help of IUB link; a base station controller RNC connected with a base station stores a base station topological relation table; if the RNC detects the IUB link of the base station connected with the RNC is broken, switching to an OMCB backup link for communication according to the base station topological relation table; the topological relation table comprises a source node, a destination node, a next hop node and hop count.

2. The method of claim 1, wherein the detecting, by the RNC, the IUB link delinking of the base station connected to the RNC is by: and the operation maintenance channel of the base station connected with the RNC is broken or the OMCB keep-alive message of the base station connected with the RNC fails.

3. The method of claim 1, wherein when the network system is updated, RNCs connected to the base station and the base station update the base station topology relationship table stored in each RNC.

4. The method of claim 1, wherein the switching to the OMCB backup link for communication is specifically: the RNC searches a link according to the base station topological relation table; and the RNC initiates an OMCB backup link establishment process through the relay base station searched in the base station topological relation table, if the establishment is successful, the RNC switches to the backup link to transmit data, and if the establishment is failed, the RNC searches the link again and initiates the OMCB backup link establishment process.

5. The method according to claim 4, wherein the performing the link search according to the base station topology relationship table specifically comprises: and searching the link according to the minimum routing distance strategy.

6. The method of claim 4, wherein the step of initiating, by the RNC, the OMCB backup link establishment procedure through the relay base station searched in the base station topology relationship table specifically includes: the RNC sends a backup link establishment request to the relay base station, the relay base station makes a decision according to whether a local end link meets a preset link condition, and if the local end link meets the preset link condition, a backup link establishment acknowledgement ACK is replied to the RNC; if not, replying a backup link chain establishment rejection NAK to the RNC;

7. The method of claim 1, wherein when the RNC detects that the IUB link of the base station connected to the RNC is back to normal, the RNC is switched to communicate with the IUB link of the base station connected to the RNC.

8. A network system, characterized in that the network system comprises: a base station, a base station controller and an OMCB backup link of a network management background; the OMCB backup link is a network independent of IUB link transmission network between base stations NodeB under the condition of not changing the existing network structure, and the network connects the NodeB to achieve the interconnection of the NodeB without the help of IUB link; wherein,

the base station is used for storing a base station topological relation table, and the topological relation table comprises a source node, a destination node, a next hop node and hop count;

the base station controller is used for storing a base station topological relation table; and when the base station controller detects the IUB link of the base station is broken, switching to the network management background backup link for communication.

9. The network system of claim 8, wherein when the network system is updated, the base station and the base station controller update the base station topology relationship table stored in each.

10. The network system of claim 8, wherein the network system further comprises a relay base station;