WO2012155603A1

WO2012155603A1 - Looped base station system and method of performing service disaster recovery protection using the same

Info

Publication number: WO2012155603A1
Application number: PCT/CN2012/071881
Authority: WO
Inventors: 李新征; 郑科
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-04
Filing date: 2012-03-02
Publication date: 2012-11-22
Also published as: CN102868440A; CN102868440B

Abstract

Disclosed are a looped base station system and a method of performing service disaster recovery protection using the same. The system comprises a base station controller (BSC) and several radio remote units (RRU), an active base band unit (BBU) and a standby BBU. Each RRU is disposed with an active optical interface and a standby optical interface; several of the RRUs are connected in series into an RRU queue in the manner of connecting a standby optical interface of a superior RRU and an active optical interface of a subordinate RRU, an active optical interface of an RRU at the head of the queue and the active BBU are connected, and a standby optical interface of an RRU at the tail of the queue and the standby BBU are connected; the active BBU and the standby BBU are separately connected to the BSC. In the present invention, several RRUs, two BBUs and a BSC form a looped network; when a fault occurs, by switching active and standby optical interfaces on an RRU, and further by establishing a standby link and restoring work of a site, it is avoided that the entire site fails to be used during a fault at a certain device or a fault at a certain segment of link.

Description

Ring base station system and method for performing service disaster tolerance protection thereof

The present invention relates to the field of mobile communication technologies, and in particular, to a ring base station system and a method for performing service disaster tolerance protection using the same. Background technique

The second-generation distributed BTS (Base Transceiver Station) consists of a RRU (Radio Remote Unit) and a BBU (Base Band Unit). The link between the BTS and the BSC (Base Station Controller) is the transmission of signaling, voice or data services by means of wired transmission, satellite transmission or microwave transmission. Optical fiber transmission is used between the RRU and the BBU.

Today's latest mobile network networking methods are distributed networking. There are a number of factors that can cause transmission interruptions between network elements, such as power interruptions, equipment failures, or other natural weather effects. At present, the existing networking methods have more or less problems, that is, when a device fails or a certain link fails, the entire site cannot be used.

Figure 1 shows the distributed networking method currently in common use. The disadvantage of this networking mode is that when the upper-level RRU is faulty or the transmission is interrupted, all the lower-level RRUs cannot work.

To solve the above problem, the prior art adopts the networking mode as shown in FIG. 2. 2 is a schematic structural diagram of an RRU ring network in the prior art. The BBU and the number of RRUs in the network form a ring network. The networking mode of the ring network can prevent the problem that the lower-level RRU cannot work when a certain point between the RRUs fails. However, the networking mode has the following defects: When the BBU is abnormal or the link between the BBU and the BSC is abnormal, the entire site cannot work. Summary of the invention

The technical problem to be solved by the present invention is to provide a ring base station system and a method for performing service disaster recovery protection thereof, which is used to solve the problem that when the BBU is abnormal or the link between the BBU and the BSC is abnormal, the entire site is caused in the prior art. Unable to work.

To solve the above technical problem, in one aspect, the present invention provides a ring base station system, including a base station controller BSC and a plurality of radio remote units RRU, the system further comprising: a primary baseband processing unit BBU and a backup baseband processing unit BBU Each of the RRUs is provided with an active optical port and a backup optical port; a plurality of the RRUs are connected in series with the primary optical port of the lower-level RRU through the standby optical port of the upper-level RRU to form an RRU queue. The primary optical port of the RRU is connected to the primary BBU, and the standby optical port of the tail RRU is connected to the standby BBU; the primary BBU and the standby BBU are respectively connected to the BSC.

Further, the active BBU is connected to the BSC through an E1 interface or an Ethernet interface. Further, the standby BBU is connected to the BSC through an E1 interface or an Ethernet interface. In another aspect, the present invention further provides a method for performing service disaster tolerance protection by using the foregoing ring base station system, where the method includes:

When the ring base station system works normally, all the RRUs only establish a service connection with the active BBU;

When the ring base station system fails, all the RRUs that cannot work normally due to the fault perform the switching of the primary optical port and the standby optical port; after the switching of the primary optical port and the standby optical port is performed by the tail RRU, The standby optical port sends data to establish a link with the standby BBU.

Further, when the ring base station system is faulty, all the RRUs that cannot work normally due to the fault perform the switching of the primary optical port and the standby optical port, specifically:

The fault that occurs in the ring base station system is a broken link between the BSC and the active BBU, and after detecting the broken link, the active BBU notifies the first RRU of the team to perform the primary optical port and the standby optical port. Switching The first RRU performs the switching between the primary optical port and the standby optical port, and notifies the lower-level RRU connected to the primary optical port to switch the primary optical port and the standby optical port. Similarly, the lower-level RRU performs the primary optical port and the standby optical port. The switching is performed and notified downwards, and the switching of the primary optical port and the standby optical port is performed by the step-by-step notification.

The failure of the ring base station system is that the primary BBU is faulty, and after the primary RRU detects that the primary optical port is broken, the primary optical port and the backup optical port are switched, and the connection is notified. The lower-level RRU performs the switching between the primary optical port and the standby optical port. Similarly, the lower-level RRU performs the switching between the primary optical port and the standby optical port and notifies the downward optical notification by means of step-by-step notification until the tail-end RRU performs Switching between the main optical port and the standby optical port.

The failure of the ring base station system is a broken link between the primary BBU and the first RRU. After the primary RRU detects that the primary optical port is broken, the primary optical port and the backup optical port are used. The switching of the primary optical port and the backup optical port is performed by the lower-level RRU connected to the lower-level RRU. Similarly, the lower-level RRU performs the switching of the primary optical port and the standby optical port and notifies the downward direction. Until the end of the team RRU performs the switching of the primary optical port and the standby optical port.

If the fault occurs in the ring base station system, the RRU queue is faulty, and the first RRU in the RRU queue detects the RRU of the active optical port, and performs the switching between the primary optical port and the backup optical port. The lower-level RRU connected to the lower-level RRU is configured to perform the switching between the primary optical port and the standby optical port. Similarly, the lower-level RRU performs the switching between the primary optical port and the standby optical port and notifies the downward direction, by means of step-by-step notification, until the team The tail RRU performs switching of the primary optical port and the standby optical port. Further, after the fault of the ring base station system is repaired, all the RRUs are restored to the state before the ring base station system fails.

Further, when the ring base station system works normally, the tail RRU does not send data to its standby optical port.

The invention combines a plurality of RRUs, two BBUs, and a BSC to form a ring network. When a fault occurs, the active/standby optical port on the RRU is switched, and then the standby link is established to restore the site work, thereby avoiding a certain device failure or When a link fails, the entire site cannot be used. DRAWINGS

1 is a schematic structural diagram of a distributed networking in the prior art;

2 is a schematic structural diagram of a RRU ring network in the prior art;

3 is a schematic diagram of a networking structure of a ring base station system according to an embodiment of the present invention; and FIG. 4 is a schematic diagram of a networking structure of another ring base station system according to an embodiment of the present invention. detailed description

The present invention provides a ring base station system and a method for using the same to perform service disaster recovery protection when the BBU device or the link between the BBU and the BSC is abnormal, and the following methods are provided. The invention and its embodiments are further described in detail. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 3, an embodiment of the present invention relates to a ring base station system, including a BSC, a plurality of RRUs (RRU1-RRUn), and an active BBU (BBU1) and a standby BBU (BBU2): wherein each RRU is set There are a primary optical port (primary fiber interface) and a backup optical port (spare optical interface); several RRUs are connected in series to the RRU queue through the standby optical port of the upper RRU and the primary optical port of the lower RRU. The main optical port is connected to the main BBU, the team The standby optical port of the tail RRU is connected to the standby BBU; the primary BBU and the standby BBU are respectively connected to the BSC.

Two BBUs (the primary BBU and the standby BBU) are connected to the BSC through the E1 interface (E1 is a 30-way pulse code modulation PCM for Europe, and the rate is 2.048 Mbit/s), so that several RRUs and two The BBU and the BSC form a ring network.

In this network, two BBUs are connected to all RRUs, and the physical and logical configurations are two sets of sites. Although all the RRUs are connected to the active and standby BBUs through the active and standby optical ports, only one BBU establishes service contacts to form a site. Once the optical port corresponds to the upper link or the BBU fails, the RRU automatically builds a link to the lower level to form a new site and work. When the link is faulty, the RRU can automatically switch to the primary direction. The entire ring is restored to the state before the fault occurred.

In addition, the embodiment of the present invention further relates to a method for performing service disaster recovery protection by using the ring base station system, which includes:

When the ring base station system works normally, all RRUs only establish service connections with the active BBU. When the ring base station system works normally, the tail RRU does not send data to its standby optical port.

When the ring base station system fails, all the RRUs that cannot work normally due to the faults perform the switching between the primary optical port and the standby optical port. After the switching of the primary optical port and the backup optical port, the tail RRUs are connected to the standby optical port. Send data and establish a link with the standby BBU.

All RRUs that cannot work normally due to faults refer to all RRUs included in the RRU queue from the fault occurrence to the tail RRU. When the primary BBU is disconnected from the BSC, the primary BBU fails, or the primary BBU and the first RRU are interrupted. Chain, all RRUs that do not work properly due to failures refer to the entire RRU queue.

The switching between the primary optical port and the standby optical port of the RRU in the RRU of the present embodiment refers to the switching between the primary optical port and the standby optical port of the RRU itself; it does not refer to the primary optical port of the original RRU1 between the two RRUs. Connect the standby optical port of the RRU2 to the standby optical port of the RRU1. The failure of the ring base station system usually includes the following situations:

1), the broken link between the BSC and the main BBU;

2), the main BBU is faulty;

3), the main BBU and the team leader RRU between the broken chain;

4) The RRU queue is faulty: A fault occurs in one RRU or multiple RRUs in the RRU queue, or a link between adjacent RRUs is broken. In the case of multiple RRU failures, multiple failed RRUs and the links between them are treated as one RRU. The first RRU that detects its active optical port break is the RRU in the RRU queue that is closest to the fault and close to the tail RRU. For example, the RRU queue is RRU1~RRU10. When RRU5 is disconnected from RRU6, RRU5 and RRU6 are closest to the fault, but RRU6 is closer to RRU10 (Routine RRU) than RRU5. Therefore, RRU6 is the first to detect its primary use. The RRU of the broken link of the optical port.

For the first type of fault, the active BBU notifies the first RRU of the team to perform the switching between the primary optical port and the standby optical port after detecting the broken link; the first RRU performs the switching between the primary optical port and the standby optical port, and notifies The lower-level RRU connected to it performs the switching between the primary optical port and the standby optical port. Similarly, the lower-level RRU performs the switching between the primary optical port and the standby optical port and notifies the downward optical notification by means of step-by-step notification until the tail RRU. Switching between the main optical port and the standby optical port.

For the second type of fault, after the primary RRU detects that the primary optical port is broken, the primary optical port and the backup optical port are switched, and the lower-level RRU connected thereto is notified to perform the switching between the primary optical port and the standby optical port. In the same way, the lower-level RRU performs the switching of the primary optical port and the standby optical port and informs downwards, and the switching of the primary optical port and the standby optical port is performed until the tail RRU is performed by the step-by-level notification.

For the third type of fault, after the primary RRU detects that the primary optical port is broken, the primary optical port and the backup optical port are switched, and the lower-level RRU connected to the primary RRU is switched to perform the switching between the primary optical port and the standby optical port. In the same way, the lower-level RRU performs the switching of the primary optical port and the standby optical port and informs downwards, and the switching of the primary optical port and the standby optical port is performed until the tail RRU is performed by the step-by-level notification.

For the fourth fault, the first RRU in the RRU queue detects the RRU of its active optical port broken chain. The switching between the primary optical port and the standby optical port is performed, and the lower-level RRU connected to the primary optical port is switched to the standby optical port. Similarly, the lower-level RRU performs the switching between the primary optical port and the backup optical port. The notification is performed by means of step-by-step notification, until the end of the team RRU performs the switching of the primary optical port and the standby optical port.

After the above four types of faults are repaired, all RRUs are restored to the state before the ring base station system failed.

Hereinafter, a detailed description will be given with a specific embodiment.

Figure 4 is a specific application example of the embodiment. As shown in Figure 4, the RRU queue includes four RRUs, which correspond to RRUs 1~4. Two BBUs are used. BBU1 is the primary BBU and BBU2 is the standby BBU.

According to Figure 4, the two BBUs and the four RRUs are composed of two sites, as follows: Site 1, BBU1 → RRU1 → RRU2 → RRU3 → RRU4, the main optical port of RRU1 is connected to BBU1, and the RRU2 is connected by optical port. The backup optical port of the RRU1, the RRU3 main optical port is connected to the standby optical port of the RRU2, and the RRU4 main optical port is connected to the standby optical port of the RRU3;

Site 2, BBU2→ RRU4→ RRU3→ RRU2→ RRU1, the backup optical port of RRU4 is connected to BBU2, the standby optical port of RRU3 is connected to the main optical port of RRU4, and the standby optical port of RRU2 is connected to the main optical port of RRU3, RRU1 The backup optical port is connected to the main optical port of the RRU2.

As mentioned above, the physical RRUs of the two sites are the same, and the logical carrier frequency configuration of the two sites is the same, but the cascading order is different.

The operation and switching mechanism of the site is as follows:

1. Under normal circumstances, each RRU is connected to the BBU1 or the upper RRU through the primary optical port. Therefore, in normal case, station 1 works, BBU1 can receive RRU1 data on the optical port, RRU1 ^→ RRU2→RRU3 ^→ RRU4 work normally, and site 1 cell is closed. Normally, RRU4 is the last stage of station 1, and does not send data to the backup optical port. Therefore, BBU2 cannot receive the data of the connected RRU, and the site 2 cell is blocked. The entire ring network works in the main state. 2. When the link between the BBU1 and the BSC is disconnected, and the BBU1 detects that the SCTP (Stream Control Transmission Protocol) link is disconnected from the BSC, the BBU1 notifies the RRU1 to initiate optical port switching. The RRU1 is responsible for its own switching and subsequent stages. The RRU is switched to the backup optical port. The RRU1 detects the main optical port disconnection alarm, performs optical port switching, sends data to the standby optical port, notifies the lower-level RRU2 to perform optical port switching, and RRU2 notifies RRU3, the level notification, the last one. The RRU4 also performs optical port switching to send data to the backup optical port. In this way, BBU2 can establish a link with RRU4, and BBU2 re-sends configuration data to RRU4 → RRU3 → RRU2 → RRU1, and the site 2 cell is closed. At this time, station 2 starts to work, the site 1 cell is blocked, and at the same time, the upper port is alerted, and the engineering personnel are notified to repair, and the entire ring network enters the standby working state.

3. When the BBU is faulty, for example, the BBU1 is powered off, the RRU1 detects the main optical port disconnection alarm, performs the optical port switching, sends data to the standby optical port, notifies the lower-level RRU2 to perform optical port switching, and RRU2 notifies RRU3, the level The last-stage RRU4 also performs optical port switching to send data to the backup optical port. In this way, BBU2 can establish a link with RRU4, and BBU2 re-sends configuration data to RRU4→RRU3→RRU2→RRU1, and the site 2 cell is closed. At this time, the station 2 starts to work, the station 1 is blocked, and the optical port alarm is reported, and the engineering personnel are notified to repair, and the entire ring network enters the standby working state.

4. When the fiber of RRU1 to BBU1 is broken, in this case, the switching process is the same as step 3.

5. Under normal circumstances, when the cascading fiber between the RRUs is broken, such as the fiber break of the RRU2 to the RRU3, the RRU3 detects that the main optical port is broken, and the RRU3 performs optical port switching to the standby optical port. Send data, notify the lower-level RRU4 to perform optical port switching, and RRU4 sends data to the standby optical port. This way BBU2 can be linked to RRU4. BBU1 ^→ RRU1→RRU2 work as site 1; BBU2→RRU4→RRU3 work as site 2, and the entire ring network splits into two independent sites.

6. When the fault described in the above 2, 3, 4 returns to normal, RRU1 detects the main optical port. The chain-breaking alarm is restored, and the switchover is initiated again. The data is sent to the main optical port, and the lower-level optical port switching is notified to the lower-level RRU4. The last-level RRU4 also performs optical port switching, and sends data to the main optical port. In this way, the site 1 is working again and the cell is closed. The BBU2 of the site 2 cannot receive data from the RRU4 backup optical port, the site 2 cell is blocked, and the entire ring network returns to normal. When the fault described in the above 5 is restored to normal, the RRU2 sends data to the RRU3. The RRU3 detects that the active optical port is restored to normal. The RRU3 initiates a switchover again, sends data to the primary optical port, and notifies the RRU4 to perform optical port switching. Send data to the main optical port.

It can be seen from the foregoing embodiment that the present invention combines a plurality of RRUs, two BBUs, and a BSC to form a ring network. When a fault occurs, the active/standby optical port on the RRU is switched, and then the standby link is restored. Work to avoid situations where a device fails or a link fails, causing the entire site to become unusable.

While the preferred embodiments of the present invention have been disclosed for purposes of illustration, those skilled in the art will recognize that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above. Industrial applicability

The invention combines a plurality of RRUs, two BBUs, and a BSC to form a ring network. When a fault occurs, the active/standby optical port on the RRU is switched, and then the standby link is established to restore the site work, thereby avoiding a certain device failure or When a link fails, the entire site cannot be used.

Claims

Claim

A ring base station system, comprising a base station controller BSC, a plurality of radio remote units RRU, a primary baseband processing unit BBU, and a backup baseband processing unit BBU: wherein each of the RRUs is provided with an active optical port and A plurality of the RRUs are connected in series with the main optical port of the lower RRU through the standby optical port of the upper RRU, and the main optical port of the first RRU is connected to the active BBU. The standby optical port of the RRU is connected to the standby BBU; the primary BBU and the standby BBU are respectively connected to the BSC.

2. The ring base station system according to claim 1, wherein the active BBU is connected to the BSC through an E1 interface or an Ethernet interface.

3. The ring base station system according to claim 1, wherein the standby BBU is connected to the BSC through an E1 interface or an Ethernet interface.

A method for performing service disaster tolerance protection by using the ring base station system according to any one of claims 1 to 3, the method comprising:

The service disaster recovery protection method according to claim 4, wherein, when the ring base station system fails, all the RRUs that cannot work normally due to the fault perform the switching of the primary optical port and the backup optical port, specifically :

The fault that occurs in the ring base station system is a broken link between the BSC and the active BBU, and after detecting the broken link, the active BBU notifies the first RRU of the team to perform the primary optical port and the standby optical port. Switching The first RRU performs the switching between the primary optical port and the backup optical port, and notifies the lower-level RRU connected to the primary optical port and the backup optical port to be switched; the lower-level RRU performs the switching between the primary optical port and the standby optical port. Downward notification, by means of step-by-step notification, until the end of the team RRU performs the switching of the primary optical port and the standby optical port.

The failure of the ring base station system is that the primary BBU is faulty, and after the primary RRU detects that the primary optical port is broken, the primary optical port and the backup optical port are switched, and the connection is notified. The lower-level RRU performs the switching between the primary optical port and the standby optical port; the lower-level RRU performs the switching of the primary optical port and the standby optical port and notifies the downward optical wave, and the primary light is used until the tail-end RRU performs the primary light. Switching between the port and the spare port.

The service disaster recovery protection method according to claim 4, wherein, when the ring base station system fails, all the RRUs that cannot work normally due to the fault perform the switching of the primary optical port and the standby optical port, specifically :

The method of claim 4, wherein, when the ring base station system fails, all the RRUs that cannot work normally due to the fault perform the switching of the primary optical port and the standby optical port, specifically :

If the fault occurs in the ring base station system, the RRU queue is faulty, and the first RRU queue detects the RRU of the main optical port broken link, and performs the primary optical port and the standby optical port. Switching, and notifying the lower-level RRU connected to it to switch the primary optical port and the standby optical port; the lower-level RRU performs the switching of the primary optical port and the standby optical port and notifies the downward direction, by means of step-by-step notification, until the team The tail RRU performs switching of the primary optical port and the standby optical port.

The method of service disaster recovery protection according to claim 4, wherein, after the fault of the ring base station system is repaired, all the RRUs are restored to a state before the ring base station system fails.

The method of service disaster recovery protection according to any one of claims 4 to 9, wherein, when the ring base station system works normally, the tail RRU does not send data to its standby optical port.