CN100481989C - A method for dynamic distribution of side signaling link of base station in mobile communication system - Google Patents

Abstract

The invention discloses a method for dynamically allocating links on the base station side in a mobile communication system, comprising: setting at least two links between each base station and a controller; The maximum threshold N; during normal communication, a link between the base station and the base station controller is used as the main link to complete signaling interaction, and the other links are used as backup links; the flow detection module detects the flow of the main link, And judge the size of the main link flow and N, if it is greater than N, then start to enable all backup links by the link allocation module, to jointly undertake the total business of the base station side; detect the flow of all links, and calculate the current total flow, the comparison module judges the current total flow and M, if it is less than M, all backup links are closed, and the current total service is switched to the main link. The invention has high reliability, improves the utilization rate of system resources, and reduces waste of resources.

Description

Method for Dynamic Allocation of Signaling Links at Base Station Side in Mobile Communication System

technical field

The invention relates to a method for allocating signaling links in a mobile communication system, in particular to a method for dynamically allocating signaling links at a base station side in a mobile communication system.

Background technique

Since the 1980s, mobile communication has met people's requirements for communication in work and life with its convenience and flexibility, showing a momentum of rapid development. The number of mobile communication users is growing rapidly, and the status of mobile communication is increasing day by day. Mobile communication services are also changing. With the development and popularization of the Internet, mobile data services are generally favored. The increase in the number of users and the development of mobile data services require more spectrum resources, and also put forward higher requirements for the data transmission capabilities of mobile communications; the spectrum efficiency and spectrum resources of the existing second-generation mobile communications cannot meet this requirement. In many countries, there is already a shortage of spectrum resources, and there is an urgent need to adopt new frequency bands and technologies with higher spectrum efficiency. In response to this situation, the International Telecommunication Union (ITU) proposed the third generation (3G) mobile communication system to alleviate the shortage of spectrum resources and meet the requirements of multimedia services and high quality of service.

The 3G mobile communication system includes three parts: Core Network (CN), Radio Network Subsystem (RNS) and User Equipment (UE). The radio network subsystem includes two entities, the radio network controller (RNC) and the Node B. Wherein, Node B is the base station of 3G system, is connected with RNC through Iub interface.

At present, there are usually two ways to control the inter-office link of the Iub interface: one is the main-standby switching mode, that is, under normal circumstances, only the main link is used, and the backup link is idle. When the normal signaling transmission is completed, the active-standby switchover process is started, the standby link is set as active, and the original active link becomes standby. Another way is the way of load sharing, that is, multiple links are used to provide services for upper-layer users at the same time.

Although the two existing link control methods are simple to implement, they both have disadvantages. For the active/standby switchover mode, the reliability of this mode is relatively good under normal circumstances, but the standby link occupies resources but is idle most of the time (the active link is not damaged), resulting in low resource utilization. Moreover, when the business is not busy, this method can provide services normally, but when a large number of businesses occur at the same time, the main link is overwhelmed and packet loss occurs, but as long as the link status is still normal, the backup link is still idle state until the active link state changes. Moreover, the reliability of data transmission will also decrease in the process from the discovery of a problem with the active link to the activation of the backup link. The load sharing method uses all Iub interface inter-office link resources to coordinate work, which reduces resource waste and improves signaling transmission efficiency. However, when multiple links are used to serve a certain user at the same time, if there is an abnormal situation such as a link congestion, although the data transmission on each link can still be guaranteed, the data on these congested links may be uploaded to the user. The timing relationship has been disturbed, thereby reducing the reliability of the transmission.

Contents of the invention

Aiming at the problems and deficiencies in the signaling link allocation method in the above-mentioned existing mobile communication system, the purpose of the present invention is to provide a mobile communication system with high reliability, high resource utilization, and simple realization of the base station side A method for dynamically allocating signaling links.

The present invention is achieved in this way: a method for dynamically allocating signaling links at the base station side in a mobile communication system, comprising the following steps:

(1) There are at least two signaling links connected between each base station and its corresponding base station controller, and the minimum threshold of the total traffic flow of the signaling link between the base station and its corresponding base station controller and the The maximum threshold of traffic;

(2) During normal communication, a signaling link is enabled between the base station and its corresponding base station controller as the main link to complete the signaling interaction between the base station and its corresponding base station controller. Using a signaling link other than the signaling link as a backup signaling link; the traffic detection module of the base station controller detects the traffic of the main signaling link, and the comparison module judges the detected main signaling link The size of the maximum threshold of the signaling link flow and the signaling link flow, if the active signaling link flow exceeds the maximum threshold of the signaling link flow, the signaling link allocation module starts to enable all A standby signaling link to jointly undertake the business between the base station and its corresponding base station controller; the traffic detection module detects the traffic of all signaling links, and calculates the traffic between the base station and its corresponding base station controller The current signaling total flow, the comparison module judges the size of the current signaling total flow and the minimum threshold of the total flow, if the current signaling total flow is lower than the total flow minimum threshold, all backup signaling links are closed, and the The service between the base station and its corresponding base station controller is switched to the active signaling link.

Preferably, the minimum threshold of total signaling link traffic is less than or equal to the maximum threshold of traffic of each signaling link.

Preferably, said step (2) also includes the following steps:

After the traffic detection module detects the traffic of all signaling links, the comparison module must also judge the traffic of each signaling link and the maximum threshold of the signaling link traffic. For the signaling link with the maximum threshold of signaling link traffic, the service control module reduces the service between the base station and its corresponding base station controller, or the signaling link allocation module allocates traffic between the base station and its corresponding base station. Add temporary signaling links between controllers.

Preferably, the method also includes the steps of:

After a temporary signaling link is added between the base station and its corresponding base station controller, the traffic detection module detects the traffic of all signaling links, and calculates the current signaling link between the base station and its corresponding base station controller. Total flow, when the total flow of current signaling is less than the product of the number of active and standby signaling links and the maximum threshold of signaling link flow, the temporary signaling link will be withdrawn; if the flow of each signaling link exceeds The maximum threshold of the signaling link traffic, the service control module reduces the service between the base station and its corresponding base station controller, or the signaling link allocation module reduces the traffic between the base station and its corresponding base station controller Continue to add temporary signaling links between them.

When the present invention completes signaling interaction by setting multiple links between each base station and its corresponding base station controller, under normal circumstances, only one of the links is used as the main link between the base station and its corresponding base station controller One link is used for communication, and the other links are used as backup links. However, when the traffic of the active link exceeds the set maximum traffic threshold of the link, the standby link is enabled to share the signaling traffic. If the traffic is reduced to the point where a link can bear it, the traffic will be switched to any link, and the bearer link will be the active link.

Specifically, the present invention has the following advantages:

High reliability. When the traffic volume is small, the main link is used to complete the communication. One link is the most stable and reliable for signaling transmission. When the traffic volume increases to a certain level, using only one link may cause congestion. At this time, all links will be enabled to share the traffic. In terms of congestion or link failure caused by the use of a link under heavy traffic, this method will have higher reliability.

The utilization rate of resources is improved and the waste of resources is reduced. There are some idle resources in the system. If these resources are evenly allocated to each base station, it may not be of much help to them, and for base stations with low traffic, allocating resources is purely wasteful. The present invention uses idle resources in the system as dynamic temporary links. When a base station activates a backup link and still cannot meet the traffic load, the temporary links can be allocated to these base stations, and when the traffic of these base stations drops, the Take back the temporary link. This greatly improves the effective utilization of the overall system resources.

Description of drawings

Fig. 1 is the schematic diagram of each flow state of the present invention;

Fig. 2 is a schematic diagram of the use state of the Iub interface link of the present invention;

Fig. 3 is a schematic diagram of the implementation structure of the RNC of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The present invention is described by taking the 3G mobile communication system as an example. RNC and Node B are connected through Iub interface. There are at least two links between each Node B and RNC, and the links between each Node B and RNC form a traffic load group. Set the minimum threshold M of total traffic in the load group and the maximum threshold of each link traffic N. Among them, as shown in Figure 1, the N value is set as follows: in the system, a data buffer is set for each link to save the data that has been sent but has not received a response, and the N value is based on the processor The processing speed and buffer size are determined so that the link will not be congested and packet loss shall prevail. The N value can be expressed by the specific number of buffer blocks occupying the buffer, or by the ratio of the largest available buffer to the entire buffer. The specific value and expression form can be determined according to the actual system. For M, M≤N should be satisfied.

As shown in Figure 1, during the communication process between Node B and RNC, under normal circumstances, the traffic is not very large. A link should be used between Node B and RNC to complete the data interaction in the load group. The enabled link is The active link, and the rest of the links are standby links, which are idle. A traffic detection module is set in the RNC, which is responsible for detecting and monitoring the traffic of the enabled link (that is, detecting the occupancy of the buffer corresponding to the enabled link), and at the same time, the comparison module in the RNC judges whether the traffic of the active link exceeds the link traffic. The maximum threshold N of traffic, if it exceeds the N value, the link allocation module of the system will start to enable all the backup links in the load group, and all the links set between Node B and RNC will jointly bear all the traffic in the load group , into a load sharing scheme. According to specific needs, the detection cycle of the traffic detection module for each enabled link can be set. When the state switching is frequent, the detection cycle can be appropriately reduced, otherwise, the detection cycle can be increased. In addition, when the rare earth resources are large, the detection cycle can be appropriately reduced, otherwise, the detection cycle can be increased.

In the case of load sharing, the traffic detection module detects the traffic of each active and standby link according to the set period, and the system will first sum the traffic detected by each link and compare it with the set minimum threshold of total traffic M For comparison, if it is less than M, it means that the total traffic between the Node B and the RNC can be carried by one link at this time, and in order to avoid the theoretical flaw of the load sharing method (it may cause data timing disorder, thereby affecting the communication quality ), the present invention will immediately transfer the business in the load group to a certain link, and still adopt the active state of the active link to ensure the communication quality. If the traffic sum of each link is greater than M, the comparison module will judge whether there is a link whose traffic exceeds N. If there is, it means that the current traffic has reached the full load state, and it is necessary to reduce the business in the load group or increase it in the load group. Temporary link, the present invention goes to request link addition state.

In the state of requesting link addition, the system decides to add a temporary link or reduce services according to the current resource status. If the system resources are insufficient and there is no temporary link available, the system will not be able to add temporary links, but will achieve this by reducing services in the load group. Although the practice of reducing traffic will cause some users to be unable to enjoy the service at this moment, it is still a better way than degrading the communication quality of all current users in the entire load group. Of course, if the system has sufficient available resources and there is a temporary link, add a temporary link to the load group with more traffic to share the business in the load group with the main and backup links.

After the traffic of each link is detected under the load sharing mode, those skilled in the art should understand that it is also possible to first judge whether there is a link with traffic exceeding N, and if so, go to the state of requesting link addition, otherwise calculate Find the sum of the traffic of each link, and judge whether the sum of the traffic is less than M.

For a load group assigned a temporary link, it is also necessary to perform traffic detection on each link (including the temporary link). Assuming that the number of links in the load group is L at this time, calculate the sum H of the traffic of each link. If H<(L-1)×N, go to the request to delete the temporary link status and delete a temporary link. link, if there is no temporary link in the current load group, the state will automatically transfer to the load sharing state. If there are links with traffic exceeding N in the load group, go to the state of requesting link addition, and continue to add temporary links in the load group or reduce the services in the load group.

When the active link is enabled and the standby link is idle, if the traffic detection module detects that the active link fails or the traffic is abnormal, the standby link is enabled as the signaling interaction link between Node B and RNC. link as the active link.

The 3G mobile communication system of the present invention refers to a time division synchronous code division multiple access (TD-CDMA) system, a wideband code division multiple access (WCDMA) system and a CDMA2000 system.

As shown in Figure 2, the figure clearly shows the connection of each link between the Node B and the RNC. In the figure, the dotted arrow line indicates the standby link, the solid arrow line indicates the activated link, and the dotted arrow line indicates the activated temporary link. This figure is shown by taking an active link, a backup link and a temporary link as an example. The present invention actually includes three working states, that is, when the flow rate is not large, the main and backup link state (only the main link is enabled), and when the flow continues to increase beyond the flow threshold of the main link, the main and backup links are enabled at the same time. A load sharing state is formed. If the traffic continues to increase and the link still exceeds the set threshold, a temporary link is enabled (if there is a temporary link available), and it becomes a load sharing state with a temporary link; or the link group is reduced in business.

As shown in Fig. 3, the present invention can be well used in the link management of the Iub interface. Inside the RNC, the dynamic management of the link of the Iub interface can be realized through the internal link management module of the transmission network subsystem. The link management module is located in the transmission network subsystem, and manages all inter-office links of the Iub interface. In the figure, the underlying communication platform is used to provide inter-office and inter-board communication services; operation and maintenance provides local maintenance and management functions and man-machine interfaces, etc.; the transmission network provides mutual control of transmission network layer inter-office signaling and high-level inter-office signaling The transmission function of high-level signaling includes voice and data call control, radio resource control and allocation, handover control, base station system control, etc. Each module in the figure is clear to those of ordinary skill in the art, and will not be repeated here.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and All deformations should belong to the protection scope of the appended claims of the present invention.

Claims (9)

1. A method for dynamic distribution of base station signaling links in a mobile communication system, characterized in that the method comprises the following steps: (1) There are at least two signaling links connected between each base station and its corresponding base station controller, and the minimum threshold of the total traffic flow of the signaling link between the base station and its corresponding base station controller and the The maximum threshold of traffic; (2) During normal communication, a signaling link is enabled between the base station and its corresponding base station controller as the main signaling link to complete the signaling interaction between the base station and its corresponding base station controller. A signaling link other than the main signaling link is used as a backup signaling link; the flow detection module of the base station controller detects the flow of the main signaling link, and the comparison module judges the detected main signaling link Using the size of the signaling link flow and the maximum threshold of the signaling link flow, if the active signaling link flow exceeds the maximum threshold of the signaling link flow, the signaling link allocation module starts Enable all standby signaling links to share signaling services between the base station and its corresponding base station controller; the traffic detection module detects the traffic of all signaling links, and calculates the traffic between the base station and its corresponding base station The current total signaling flow between the controllers, the comparison module judges the size of the current total signaling flow and the minimum threshold of the total flow, and if the current total signaling flow is lower than the minimum threshold of the total flow, all backup signaling is turned off link, switching the signaling service between the base station and its corresponding base station controller to the active signaling link. 2. The method for dynamically allocating signaling links at the base station side in a mobile communication system according to claim 1, wherein the minimum threshold of the total traffic of the signaling links is less than or equal to the maximum traffic of each signaling link threshold. 3. The method for dynamically allocating signaling links at the base station side in the mobile communication system according to claim 1, wherein said step (2) further comprises the following steps: After the traffic detection module detects the traffic of all signaling links, the comparison module must also judge the traffic of each signaling link and the maximum threshold of the signaling link traffic. For the signaling link with the maximum threshold of signaling link traffic, the signaling service between the base station and its corresponding base station controller is reduced by the service control module, or the signaling service between the base station and the corresponding base station is controlled by the signaling link assignment module. Add a temporary signaling link between the base station controllers. 4. The method for dynamically allocating signaling links at the base station side in the mobile communication system according to claim 3, characterized in that the method further comprises the following steps: After a temporary signaling link is added between the base station and its corresponding base station controller, the traffic detection module detects the traffic of all signaling links, and calculates the current signaling link between the base station and its corresponding base station controller. Total flow, when the total flow of current signaling is less than the product of the number of active and standby signaling links and the maximum threshold of signaling link flow, the temporary signaling link will be withdrawn; if the flow of each signaling link exceeds The maximum threshold of the signaling link traffic, the signaling service between the base station and its corresponding base station controller is reduced by the service control module, or the signaling service between the base station and its corresponding base station is reduced by the signaling link allocation module Temporary signaling links continue to be added between controllers. 5. The method for dynamically allocating signaling links at the base station side in the mobile communication system according to claim 1, characterized in that the method further comprises the following steps: When a main signaling link is used for communication between the base station and its corresponding base station controller, if the traffic detection module detects that the main signaling link fails or the traffic is abnormal, the backup signaling link is activated as A signaling exchange signaling link between a base station and its corresponding base station controller. 6. The method for dynamically allocating signaling links at the base station side in a mobile communication system according to any one of claims 1 to 5, characterized in that the traffic detection module controls the base station and its corresponding base station controller The cycle of traffic detection of the enabled signaling links between them can be set according to specific conditions. 7. The method for dynamically allocating signaling links at the base station side in a mobile communication system according to any one of claims 1 to 5, wherein the mobile communication system is a third-generation mobile communication system, and the The base station is a Node B base station, the base station controller is a radio network controller RNC, and one or more Node Bs are connected to one RNC to form a radio network subsystem. 8. The method for dynamically allocating signaling links at the base station side in a mobile communication system according to claim 7, wherein said third-generation mobile communication system refers to Time Division Synchronous Code Division Multiple Access TD-CDMA system, broadband Code division multiple access WCDMA system and CDMA2000 system. 9. The method for dynamically allocating signaling links at the base station side in a mobile communication system according to any one of claims 1 to 5, wherein the maximum threshold of the signaling link traffic is set in the following manner : Each signaling link is equipped with a buffer to save the data that has been sent but has not received a response. The maximum threshold of the flow is determined according to the processing speed of the processor and the size of the buffer, so that no congestion and packet loss occur. allow.

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