WO2006089454A1

WO2006089454A1 - A method for increasing reverse multiplex qos at the asynchronous transfer mode

Info

Publication number: WO2006089454A1
Application number: PCT/CN2005/000209
Authority: WO
Inventors: Jian Pu; Fuchuan Zhao
Original assignee: Zte Corporation
Priority date: 2005-02-22
Filing date: 2005-02-22
Publication date: 2006-08-31

Abstract

a method for increasing reverse multiplex QoS at the asynchronous transfer mode comprises configuring the priority of the data connection; receiving asynchronous transfer mode cell of the data connection, and distributing the cells to the high priority queue or the low priority queue respectively based on the corresponding priority level, and sending the cells in the high priority queue into the main transmission queue; sending the cells in the main transmission queue into the buffer of the reverse multiplex processor at the asynchronous transfer mode, and using the poll model to distribute the cells in turn into the various of links in the low rate link groups, as a result, inducing the lose ratio for the high priority cells, and increase the reverse multiplex QoS at the asynchronous transfer mode. The invention enables to induce the cell lose ratio of the high priority, and increase the reverse multiplex QoS at the asynchronous transfer mode by sending the cells in the high priority queue into the main transmission queue first.

Description

Method for improving inverse multiplexing service quality of asynchronous transmission mode

The invention relates to a method for improving the quality of reverse multiplexing service in asynchronous transmission mode, in particular to the third generation broadband code division multiple access mobile communication application and transmission networking application in the communication field. Background technique

ATM is the Asynchronous Transfer Mode, which translates to asynchronous transfer mode, or asynchronous transfer mode, asynchronous transfer mode. Refer to the ATM Forum ATM Inverse Multiplexing (IMA) specification V1. 1 , IMA (Inverse Multiplexing for ATM) refers to ATM inverse multiplexing, which is to pass an ATM cell stream in a round-robin fashion (Round- Robin Fashion) The cells are sequentially sent to a plurality of low speed links that are combined into one high bandwidth logical connection. As shown in FIG. 1, a unidirectional IMA process, the cell stream 101 from the ATM layer reaches the ATM inverse multiplexing processor 102 via the bus, and the ATM inverse multiplexing processor transmits the cell in the (Tx) direction. Round-Robin Fashion is distributed on several low-speed links (PHYs) 103 in turn, and cells in the transmit (Tx) direction are assembled in a group (IMA group) and combined into a unique letter. Yuan stream.

The IMA receiving end 104 compensates the time delay difference of the cells on the multiple links received in sequence, and then reassembles according to the order of sending, and the cell streams received on the multiple links are transmitted according to the transmission. The sequence is restored to a high speed ATM cell stream 105.

In 3G WCDMA applications, the service connection between the base station (Node B) and the base station controller (RNC) uses ATM as the bearer layer, and the interface uses ATM technology. The ATM technology usually uses the standard interface of 155 Mb/s, and the bandwidth of the base station service data. In the initial stage of 3G network construction, 2~; L0Mb/s is generally used, so ATM reverse multiplexing (ΠίΑ) technology is used in 3G networking applications to transmit a high-speed ATM cell stream of the base station controller and low-speed signals of multiple base stations. A connection between the meta-streams is implemented; a base station (Node B) uses a low-speed link group to implement a connection with a base station controller (RNC), and the low-speed link usually uses an E1 signal of 2. 048 Kb/s, a base station controller (RNC). Interconnection with a base station (Node B) through a set of links including a plurality of El signals through a dedicated optical fiber transmission network to realize connection of service data and network management data.

When one or several links in the low-speed link group corresponding to ATM Inverse Multiplexing (IMA) are disabled when the E1 link connection in the network fails, since some of the low-speed links remain connected, this When there is a mismatch between the data bandwidth of the high-speed ATM cell stream and the data bandwidth between the low-speed link groups, the ATM reverse multiplexing uses the polling method to distribute the ATM cells to the low-speed link in turn, because The transmission bandwidth of the link is smaller than the transmission data bandwidth required for the normal connection of the service, and the cell transmission congestion is inevitable. The strategy adopted is that regardless of the priority of the ATM connection, the transmission bandwidth is insufficient, and the transmitted cell is discarded when congestion occurs. The service connection service quality of the mobile terminal (mobile phone) user that causes the mobile base station access is degraded or even the service connection is interrupted, which adversely affects the operation of the mobile service. Invention disclosure

The technical problem to be solved by the present invention is to provide a method for improving the quality of the reverse multiplexing service in the asynchronous transmission mode, which solves the problem that the prior art does not distinguish between ATM connections in the event of congestion due to lack of effective ATM connection priority scheduling function. The disadvantage of priority discarding service cells and poorly multiplexed service quality.

To achieve the above object, the present invention provides a method for improving the quality of the asynchronous multiplexing mode reverse multiplexing service, which is characterized in that it comprises the following steps: Step 1: Configuring the priority of the data connection; Step 2, receiving the data connection The asynchronous transmission mode cell distributes the cell to the high priority queue or the low priority queue according to the corresponding priority, and preferentially sends the cells in the high priority queue to the primary transmission queue; Step 3: Send the primary transmission The cells in the queue are sent to the buffer of the asynchronous transfer mode inverse multiplexing processor, and the cells are sequentially distributed to the multiple links of the low-speed link group by using the polling method, thereby reducing high-priority cell loss. The rate improves the quality of service for asynchronous multiplexing mode reverse multiplexing.

The above method is characterized in that, in the step 1, the priority is configured according to different service quality parameter requirements of the service data connection.

The above method is characterized in that, in the first step, the voice and video image service data connection is configured to have a high priority, and the ordinary Internet access data service and the file transfer data service are configured as a low priority connection.

The foregoing method is characterized in that: the step 1 further includes: establishing a one-to-one correspondence between the priority level and the cell identifier of the cell, storing in the cell scheduling database, and performing real-time on the database according to the configuration. Update maintenance.

The above method is characterized in that the cell identifier is a virtual path identifier VPI or a virtual channel identifier VCI.

The above method is characterized in that: step 2 further comprises: if a low speed link occurs The barrier causes some connections to be interrupted, and data transmission is congested. The cells in the high priority queue are preferentially sent to the primary transmission queue. The chances of the cells in the low priority queue being sent to the primary transmission queue become smaller, and in the low priority queues that are too late to be sent. The cell is cached.

The foregoing method is characterized in that the step 2 further includes: if the cell buffer in the low priority queue reaches the threshold, discarding the subsequently received cell.

The foregoing method is characterized in that: the step 2 further comprises: if a plurality of link connections are interrupted, causing serious congestion in the transmission, and buffering the cells of the high priority queue that are too late to be sent, if the cell cache in the high priority queue is reached The threshold is used to discard the subsequently received cells.

The foregoing method is characterized in that: the step 2 further includes: Step a, receiving a high-speed asynchronous transmission mode cell stream from the asynchronous transmission mode layer, and checking a cell identifier of the received cell, according to the The priority correspondence determines whether it is a high priority cell, if yes, step b is performed, otherwise step c is performed; step b, if the high priority queue is not full, the cell is placed in the high priority queue and sent Go to the primary transmit queue, if the high priority queue is full, then discard the cell; Step (If the low priority queue is full, discard the cell; if the low priority queue is not full, then The cell is placed in the low priority queue, and it is determined whether the high priority queue is empty. If yes, the cell is sent to the primary transmission queue, otherwise the cell is buffered.

The advantages of the present invention are as follows: Compared with the prior art, the method of the present invention retains the existing ATM inverse multiplexing technology and adopts Round-Robin Fashion to distribute cells to multiple low speeds of the low-speed link group. The method on the link, when the low-speed link connection fails, causing the cell to be congested, the service can be scheduled by prioritizing the ATM connection according to the service quality of service (QoS) requirement, and the voice and video images are guaranteed. The service is sent preferentially. At the same time, the ordinary Internet data type service is buffered by the large-capacity buffer, and then sent after the congestion is released, which reduces the loss rate of cell transmission and improves the quality of service (QoS) of the service transmission. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the principle of ATM inverse multiplexing;

Figure 2 is a flow chart showing the steps of the method of the present invention;

FIG. 3 is a schematic block diagram of an MSTP device implementing a service connection between a base station controller and a base station through an ATM inverse multiplexing function in a 3G WCDMA transmission network;

4A, 4B, and 4C are flow diagrams showing the steps of an MSTP device using the method of the present invention. The best way to implement the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

2 is a flow chart of the steps of the method of the present invention; the detailed steps of the method of the present invention are as follows: Step 201: Configure the priority of the data connection according to different quality of service (QoS) parameter requirements of the service data connection; usually for voice and The video image service data connection is configured with high priority, and the ordinary Internet access data service and the file transfer data service are configured as low priority connections.

Step 202: According to the received configuration data, establish a one-to-one correspondence between the priority level and the identifier of the ATM cell (such as the virtual path identifier VPI/virtual channel identifier VCI), and the database may be real-time according to the configuration. Ground update maintenance.

Step 203: Receive a high-speed ATM cell stream from the ATM layer, check the cell header VPI/VCI identifier of the received cell, and distribute the cell to the high according to the priority correspondence data in the cell scheduling database. Priority queue or low priority queue.

Step 204: Check the high priority queue threshold to determine whether the high priority queue is full. If yes, go to step 205. Otherwise, go to step 206.

Step 205: Discard the cell, and return to step 204;

Step 206: The high priority queue is not full, put the cell into the queue, send it to the main sending queue, and go to step 212.

Step 207: Check the low priority queue threshold to determine whether the low priority queue is full. If yes, go to step 208. Otherwise, go to step 209.

Step 208: Discard the cell, and return to step 207.

Step 209: The low priority queue is not full, and the cells are placed in the queue.

Step 210: Check whether the high priority queue is empty. If yes, send the cells in the low priority queue to the main sending queue and go to step 212. Otherwise, go to step 211.

Step 211: The high priority queue has cells to be sent, and the low priority cells are buffered. Step 212: Send the cells in the main transmission queue to the buffer of the ATM inverse multiplexing processor, and sequentially distribute the cells to the multiple links of the low-speed link group by using Round-Robin Fashion. on.

Step 213: The ATM inverse multiplexing processor processes:

When the low-speed link fails, some of the connections are interrupted, and the data bandwidth of the ATM cell stream is higher than this. The data bandwidth of the low-speed link group is congested. Because the cells in the high-priority queue are preferentially sent to the primary transmission queue, the chances of the cells in the low-priority queue being sent to the primary transmission queue become smaller, and the low priority is not sent. The cells in the queue are cached.

After the cell cache in the low priority queue reaches the threshold, the subsequently received cells are discarded.

When a plurality of link connections are interrupted and the transmission congestion is severe, the cells of the high priority queue that are too late to be sent are buffered. When the cell cache in the high priority queue reaches the threshold, the subsequently received cells are discarded.

Figure 3 shows an application example of a 3G WCDMA transmission network using an SDH-based Multi-Service Transport Platform (MSTP) device. A group of base stations (Node B) 301: [MA El signal is accessed by the access fiber network to access the service data of the base station to the plurality of base stations on the optical fiber transmission network 302, and the service signals of the plurality of base stations are aggregated by the optical transport network by STM-N ( N=1/4/16) The line connection transmits the service data to the MSTP device 303 where the base station controller (RNC) 304 is located, and the MSTP device converts the base station top A El service accessed by the network side into an ATM cell stream. The connection between the base station controller (RNC) 304 and the base station (Node B) 301 is implemented by connecting to the base station controller (RNC) through the ATM STM-1 interface.

Using the technical solution described in this patent, the priority of the service connection is first configured according to the following table.

At present, the service quality (QoS) categories 1 to 4 according to the ATM technology support the service category A, respectively.

For the A-type and B-type services, the high-priority connection service is defined as the high-priority connection service; in this embodiment, the class A voice and the class B video image service data connected between the base station (Node B) and the base station controller (RNC) are defined as high priority. connection.

For the C and D type services, it is defined as a low priority connection service; in this embodiment, the C type file connected between the base station (Node B) and the base station controller (RNC) transmits data services and Class D common Internet data. Management monitoring data required for business and Class D network operations is defined as a low priority connection.

4A, FIG. 4B, FIG. 4C are flowcharts showing the steps of the method for the MSTP device to use the method of the present invention, performing ATM inverse multiplexing on the ATM connection service of multiple service categories according to the high and low priority classification transmission manner, and implementing the base station controller (RNC). Process description of the service connection with the base station (Node B).

As shown in FIG. 4, according to the implementation steps of the technical solution, the network management system delivers the service connection priority configuration data based on the service QoS class to the MSTP device and establishes a cell scheduling database on the MSTP device. Each base station uses an ATM reverse multiplex group (Β Α Α group) to establish the correspondence between the ΙΜΑ group and the ATM cell identifier, and delivers the configuration data to the MSTP device.

The MSTP device receives the ATM cell stream through the STM-1 interface connected to the base station controller (RNC), and sends the cells of different ATM connection QoS classes to the high priority according to the priority correspondence according to the configuration information of the cell scheduling database. In the queue or low priority queue, the cell is sent to the main transmit queue and sent to the buffer of the ATM inverse multiplexer according to the flow shown in Figure 4, using polling mode.

(Round-Robin Fashion) distributes the cells to a plurality of El links of a low-speed link group in turn, and after mapping processing and cross-processing by the MSTP device, the cells are sent to the optical network through the line interface and sent to the remote base station. (Node B) The access point connects multiple E1 links of the low-speed link group with the base station (Node B) through the E1 interface to implement a service connection between the base station controller (RNC) and the base station (Node B).

Both high- and low-priority queues have a cell cache function, which requires a large-capacity buffer for low-priority queues. Once a transmission congestion occurs, a low-priority queue caches cells through a large-capacity buffer to make user data. Not lost.

The advantage of using this technical method is that since the access of the 3G mobile user is controlled by the base station (Node B), once the mobile user is accessed, the mobile subscriber's service in the network is at the base station (Node B) and the base station controller ( The connection relationship is established between RNCs. The transmission network needs to ensure the reliable use of such connections. The mobile users' service connections mainly include voice and data, with the highest priority of voice services, and the mobile system needs to be transmitted in the network. Data information such as management, alarm, and performance collection. When the network connection is faulty or other abnormalities cause congestion in the service transmission, the voice service connection that has been established should be preferentially guaranteed to be transmitted, and the alarm and performance of the data service and system釆If the management information is collected, it can be cached and forwarded according to the congestion status of the network, so that different service requirements can be provided for different service applications, which reduces the loss rate of cell transmission on the network and improves the network transmission service. Quality (QoS), for 3G WCDMA transmission networking applications Good At the office.

It can be seen from the above that the present invention is to overcome the prior art when the reverse multiplexing is implemented by using Round-Robin Fashion, because of the lack of effective ATM connection priority scheduling function, regardless of the ATM connection when congestion occurs. The disadvantage of discarding the service cells by the priority, and prioritizing and preferentially sending the cells in the high-priority queue to the main transmission queue, solves the prioritized scheduling problem in the prior art, and reduces the cells. The loss rate thus improves the quality of service (QoS) of ATM inverse multiplexing. ·

Of course, the present invention may be embodied in various other various modifications and changes without departing from the spirit and scope of the invention. Changes and modifications are intended to be included within the scope of the appended claims. Industrial applicability

The method of the present invention reduces the high-priority cell loss rate and improves the service quality of the asynchronous transmission mode inverse multiplexing by preferentially transmitting the cells in the high-priority queue to the main transmission queue. The method of the present invention can preferentially ensure the management of the data service and the alarm, performance collection and other management information of the established voice service connection, and then can be cached and forwarded according to the congestion status of the network, thereby realizing different services. The application requires different service processing methods, which reduces the loss rate of cell transmission on the network, improves the quality of service (QoS) of network transmission, and applies to 3G (third generation) WCDMA (wideband code division multiple access) transmission networking. Brought benefits. The method of the present invention is suitable for 3G WCDMA mobile communication applications and 3G WCDMA transmission networking applications in the field of communication, and the method of the present invention is equally suitable for other fields in which similar problems exist.

Claims

Claim

A method for improving the quality of an asynchronous transmission mode inverse multiplexing service, comprising the steps of:

Step 1: Configure the priority of the data connection;

Step 2: Receive an asynchronous transmission mode cell of the data connection, distribute the cell to the high priority queue or the low priority queue according to the corresponding priority, and preferentially send the cells in the high priority queue to the primary sending queue. ;

Step 3: Send the cells in the primary transmission queue to the buffer of the asynchronous transmission mode inverse multiplexing processor, and sequentially distribute the cells to multiple links of the low-speed link group by using a polling manner, thereby reducing The high priority cell loss rate improves the quality of service of the asynchronous transmission mode inverse multiplexing.

2. The method according to claim 1, wherein in the step 1, the priority is configured according to different quality of service parameter requirements of the service data connection.

The method according to claim 2, wherein in the first step, the voice data and the video image service data connection are configured to have a high priority, and the ordinary Internet access data service and the file transmission data service are configured to be low. Priority connection.

The method according to claim 1, 2 or 3, wherein the step 1 further comprises: establishing a one-to-one correspondence between the priority level and the cell identifier of the cell and storing the information in the cell scheduling database. The database is also updated and maintained in real time according to the configuration.

The method according to claim 4, wherein the cell identifier is a virtual path identifier VPI or a virtual channel identifier VCI.

The method according to claim 4, wherein the step 2 further comprises: if a failure of the low-speed link causes a partial connection to be interrupted, and data transmission is congested, and the cell in the high-priority queue is preferentially sent to the main transmission queue. The chances of the cells in the low priority queue being sent to the primary transmit queue become smaller, and the cells in the low priority queue that are too late to be sent are buffered.

The method according to claim 4, wherein the step 2 further comprises: discarding the subsequently received cells if the cell buffer in the low priority queue reaches the threshold.

The method according to claim 4, wherein the step 2 further comprises: if the multiple link connections are interrupted, causing the transmission congestion to cache the cells of the high priority queue that are too late to be sent, if high The cell cache in the priority queue reaches the threshold, and the subsequent received cells are performed. Discard processing.

9. The method of claim 1, 2, 3 or 5, wherein the step two further comprises:

Step a, receiving a high-speed asynchronous transmission mode cell stream from the asynchronous transmission mode layer, and checking whether the cell identifier of the received cell is determined to be a high priority cell according to the priority correspondence in the database, and then executing Step b, otherwise step c;

Step b: If the high priority queue is not full, the cell is placed in the high priority queue and sent to the primary sending queue, and if the high priority queue is full, the cell is discarded;

Step (If the low priority queue is full, the cell is discarded; if the low priority queue is not full, the cell is placed in the low priority queue, and it is determined whether the high priority queue is empty, Yes, the cell is sent to the main transmit queue, otherwise the cell is cached.