KR100212450B1 - Base station of mobile telecommunication system - Google Patents

Abstract

The interrupt service routine performs the minimum task to operate the receive buffer. However, since the interrupt service routine and the message reception processing unit are not associated with each other, the advantage of the polling method that the central processing unit can not efficiently manage the messages stored in the reception buffer In order to compensate for the disadvantages, we introduce a semaphore that supports synchronization between the interrupt service routine and the reception processing task, mutual exclusion to shared resources, and provides a reception processing flag and a reception counter as means for complementing the semaphore, A method of optimizing a message reception unit capable of reducing an interrupt processing load and preventing performance degradation caused by traffic is disclosed.

Description

Optimal processing of message receiver in mobile communication system base station control system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system base station control system, and more particularly, to a method of optimizing a message reception unit of communication boards constituting a mobile communication system base station control system.

In order to efficiently process the message reception by the communication devices forming the infrastructure of the message communication, the interaction between the device driver and the reception processing driver required by the protocol software or the operating system should be efficiently implemented. In order to effectively implement the interaction between the device driver and the reception processing driver, efficient methods have been devised in the embedded system to meet the characteristics required by the communication target systems, and a typical method is the polling method. The polling method allows the interrupt service routine to perform only a minimum of operations to operate the receive buffer in order to minimize the interrupt processing load. However, since the interrupt service routine and the message reception processing unit are not related to each other, there is no way to efficiently process the messages stored in the reception buffer in the central processing unit. Therefore, the central processing unit operates the reception processing task periodically to retrieve the reception buffer. Since the polling method can not process the messages generated in each reception event in real time, it has a problem of performance degradation. The higher the message traffic, the more the flooding of the reception buffer may occur.

Therefore, the present invention minimizes the interrupt processing load of the interrupt service routines frequently executed to process messages received through the interprocessor communication, and provides detailed processing including protocol processing for messages and scheduling for delivering messages to operating programs The present invention provides a high performance event-driven reception processing method capable of overcoming the disadvantage that real-time processing can not be performed while taking advantage of the above-described polling method in order to enable a function to be processed in real time at a reception processing task step.

According to another aspect of the present invention, there is provided a method for controlling a communication system, the method comprising: initializing a message receiving unit of communication boards of a base station control system; and receiving a message in a receiving buffer after the message receiving unit is initialized, And executing a reception processing task according to a received semaphore event generated in the interrupt service routine.

FIG. 1 is a block diagram illustrating a common message reception environment of communication processor boards of a mobile communication system base station control system to which the present invention is applied; FIG.

FIG. 2 is a block diagram of a message receiver software according to the present invention; FIG.

FIG. 3 is a flowchart of a message receiving unit initialization process according to the present invention; FIG.

Figure 4 is a flow chart of the processing of the receive interrupt service routine according to the present invention;

FIG. 5 is a flowchart of the processing of a reception processing task according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

11: central processing unit 12: local memory

13: direct memory access controller 14: serial input / output controller

15: nodes 16,17: communication processor board

18: Base address register 21: Reception processing task

22: Receive interrupt service routine 23: Receive buffer

24: Buffer read (READ) pointer 25: Buffer write (WRITE) pointer

26: Reception processing flag 27: Reception processing counter

28: Reception processing semaphores

The base station control system has a common communication hardware environment for interprocessor communication.

Each time a message is received in the communication hardware, the receive interrupt service routine performs only a minimum operation on the receive buffer, which is an advantage of the polling method, thereby reducing the interrupt processing load. It also allows the task step to process the detailed processing of messages stored in the receive buffer. At this time, the task is executed by an event driven method instead of the polling method, so that the interrupt service routine can notify the reception processing task of the fact when the message is stored in the reception buffer. In this case, the reception processing task maintains a state of waiting for the event, and is executed when the event occurs, thereby overcoming the disadvantage that the central processing unit periodically polls the reception buffer. This method uses the central processing unit for the time required for the interrupt service routine to generate the event to the reception processing task as compared to the polling method, but the central processing unit needs to periodically operate the receiving task to process the reception buffer And real-time processing is possible, thereby ensuring improvement of message communication performance as a whole. In order to notify the event that the interrupt service routine has reached a message to the reception processing task, a semaphore that supports synchronization between tasks or mutual exclusion to shared resources supported in the real-time operating system is called an interaction between the interrupt service routine and the reception processing task . However, the interaction between the interrupt service routine and the receive processing task is not complete with semaphores. The problem occurs when subsequent messages are received after requesting the receive buffer processing from the receive processing task via the semaphore means after completion of message reception in the interrupt service routine.

While the receive processing task is already in the process of awakening from the semaphore wait state and processing the receive buffer, the interrupt service routine can not predict at which point the receive processing task will complete the processing of the previous messages, There is no way to ask for. Therefore, the present invention contemplates a reception processing flag and a reception counter that enable the reception processing request and the completion of the reception processing to be known between the interrupt service routine and the reception processing task as another means for compensating for this problem. The basic idea of this method is that while the receive processing task processes the received messages, the interrupt service routine accumulates only the number of received messages through the receive counter unless the receive processing flag is changed to the complete state by the receive processing task, And terminates the service routine. Thereafter, when the reception processing flag changes to the reception processing completion state by the reception processing task, the semaphore is driven so that a plurality of messages can be processed by one semaphore operation, It is possible to reduce the number of semaphore events to be generated in the processing task.

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating an interprocessor communication execution environment of a mobile communication system base station control system to which the present invention is applied. The interprocessor communication network is composed of high-speed nodes 15. The base station communication processor boards 16 and 17 are connected directly or in a multi-drop manner at the end of this node. The base station communication processor boards 16 and 17 have a central processing unit 11, a local memory 12, a direct memory access controller 13, and a serial input / output controller 14 in common. In addition, the direct memory access controller 13 inherits the base address register 18.

FIG. 2 is a software block diagram of a message reception processing unit according to the present invention, which is stored in a local memory and functions as a message reception unit. The software environment includes an interrupt service routine 22 for handling interrupts that occur when the direct memory access controller has completed receiving a message, a receive buffer 23 for storing received messages, and messages stored in the receive buffer 23 And a reception processing task 21 for performing the following processing. A receive processing semaphore 28, a receive processing flag 27, a receive processing counter 27, and a read for handling the receive buffer, which are designed to efficiently process the receive buffer shared by the central processing unit and the direct memory access controller, / Write (hereinafter referred to as READ / WRITE) pointer 24 (25). The receive processing flag 27 is used as an auxiliary means of the receive processing semaphore 28 to check whether the interrupt service routine has processed the messages that previously requested processing in the receive processing task. The receive processing counter 27 is used to accumulate the number of consecutive messages in the high received message traffic. The buffer READ pointer 24 is a reception buffer pointer to be processed in the reception processing task 21 and is updated to a reception buffer address increased by the reception counter value when the reception processing is completed. Buffer WRITE pointer 25 is a receive buffer pointer for storing the next message in the interrupt service routine and this value matches the base address register value of the direct memory access controller shown in FIG.

FIG. 3 is a flow chart illustrating a message reception initialization process of the base station control system communication boards. The initialization process consists of communication chip initialization, receive buffer initialization, receive processing task and semaphore generation. The communication chip initialization initializes the receiving section of the serial input / output controller 31, initializes the direct memory access controller, and registers the corresponding receiving interrupt service routine 32. The receiver buffer initialization 34 sets the buffer READ / WRITE counter to the receive buffer start address, sets the receive counter to 0, and sets the receive processing flag to the completed state. After finishing the initialization process, the reception processing semaphore and the reception processing task are generated with the help of the operating system (33) (35). The final step of initialization is to transition the direct memory access controller and the serial input / output controller to a message receivable state (36). From this point on, it is possible to receive messages from the interprocessor communication network.

FIG. 4 is a processing flowchart of a receive interrupt service routine according to the present invention. The interrupt service routine is always in a state waiting for an interrupt generated by the direct memory access controller (41). When the message is received and stored in the receive buffer, the direct memory access controller generates an interrupt, and if the central processor recognizes the interrupt, the interrupt service routine is performed (42). The interrupt service routine increments the message reception counter and changes the buffer WRITE pointer to the direct address value of the memory access controller (43) so that the reception processing task knows the next reception buffer pointer to be processed. The interrupt service routine may now request the receive processing task to process the received messages (44) through the receive processing flag value to determine whether the receive processing request is ready prior to the request. If the value of the reception processing flag is in the end state, the current reception processing task is in the standby status of the reception semaphore, and the reception processing request flag is set to the request status (45) and the reception processing semaphore is driven (46). If the reception processing flag is not the end state, the reception processing task is in the process of processing the previous messages, so the interrupt service routine is terminated and the state transits to the reception interrupt waiting state again (41).

FIG. 5 is a processing flowchart of a reception processing task according to the present invention. FIG. First, the receive processing task is in the wait state of the receive processing semaphore (51). The receive processing task is performed by a receive semaphore event 46 (52). The receive semaphore event is generated in the receive interrupt service routine and handles the interrupt that occurs at the time the messages are stored in the receive buffer in the interprocessor communication network. The reception processing task stores the reception counter value currently held in the interrupt service routine in the temporary counter and stores the buffer READ pointer in the temporary buffer pointer (53). Since the preparation for processing the messages requiring processing by the interrupt service routine has been completed, the reception counter is set to 0 to accumulate the number of the subsequent messages, and the buffer READ pointer is set to the reception buffer to be processed in the next semaphore event To the buffer WRITE pointer managed by the interrupt service routine to set the start address (54). The receive processing task examines the temporary counter value (55). If the test result is true, after complicated message processing, the temporary counter is decremented and the temporary buffer pointer is incremented to handle the next message (56). At this time, if the temporary buffer pointer is the end address of the receive buffer (57), the temporary buffer pointer is changed to the receive buffer start address (58). The processes (55) to (58) are repeated until the temporary counter becomes zero. If the temporary counter value is 0, the receive processing flag is shifted to the end state (59), and the receive processing semaphore waiting state is again returned (51).

As described above, according to the present invention, by processing messages stored in the reception buffer in an event driven manner, real-time processing is ensured and the load of the interrupt processing is reduced. In a situation where message traffic is high, So that the performance degradation due to the traffic can be prevented.

Claims (4)

A step of initializing a message receiving unit of the communication boards of the base station control system, an interrupt service routine being performed by a central processing unit recognizing an interrupt generated in the direct memory access controller by storing a message in a reception buffer after the message receiving unit is initialized, And a reception processing task is performed by a reception semaphore event generated in the interrupt service routine. The method of claim 1, wherein initializing the message processor of the base station control system communication boards comprises: initializing a receiver of the serial input / output controller; initializing the receiver of the input / output controller to initialize the memory access controller; Setting a buffer read / write counter to a receive buffer start address after registering the receive interrupt service routine, setting the buffer read / write counter to a receive buffer start address, Setting a reception processing flag to a complete state after setting the reception counter to 0; generating a reception processing semaphore after setting the reception processing flag to a completion state; Generating a receive processing task after creating the semaphore; After creating the group receiving treatment task direct memory access controller and receive messages for serial input and output controller state step optimum processing method receiving a message of a mobile communication system base station, characterized in that the control system consisting of a transition. 2. The method of claim 1, wherein the step of performing the interrupt service routine comprises: increasing a message reception counter when receiving a receive interrupt event in an interrupt standby state; Changing a buffer write pointer to a base address register value of the controller; checking whether a reception processing flag is in an end state after changing the buffer write pointer; Setting a reception processing request flag to a request state and driving the reception processing semaphore to transmit the reception processing request flag to a reception processing task; Wait for receive interrupt after sending to task And terminating the interrupt service routine and transiting to a receive interrupt waiting state when the reception processing flag is not in an end state according to the result of the check of the reception processing flag state. Best method for message receiver. The method of claim 1, wherein the step of performing the receive processing task further comprises: when receiving a receive semaphore event from a receive interrupt service routine in a receive processing semaphore standby state of a receive processing task, Storing a buffer read pointer in a temporary buffer pointer after storing the received counter value in a temporary counter; storing the buffer read pointer in a temporary buffer pointer, Changing the buffer read pointer to a buffer write pointer after setting the reception counter to 0, changing the buffer read pointer to a buffer write pointer, and checking whether the temporary counter is larger than 0 And the temporary counter is greater than zero according to the result of the inspection of the temporary counter A step of decreasing a temporary counter and increasing a temporary buffer pointer after performing a message processing procedure; checking whether the incremented temporary buffer pointer is an end address of a reception buffer; Changing the temporary buffer pointer to a receiving buffer start address when the temporary buffer pointer is the end address of the receiving buffer, checking whether the temporary counter is greater than 0 after changing the temporary buffer pointer to the receiving buffer starting address, Checking whether the temporary buffer pointer is greater than 0 when the temporary buffer pointer is not the end address of the receiving buffer according to a result of the checking of the temporary buffer pointer; If the counter value is 0, the receive processing flag is set to the end state, and the receive processing semaphore State the mobile communication system, the base station control system of the message receiving optimal process characterized in that comprising the steps of transition to.