KR100416193B1 - A call signaling apparatus using a multiplexing/demultiplexing device of an asynchronous transfer mode cell - Google Patents

Abstract

The present invention relates to a call processing apparatus of a radio network controller (RNC) of an international mobile telecommunication system (IMT-2000). The present invention provides a plurality of call processing processors that dynamically change a weight for changing a data processing speed according to a call processing amount handled by a call processing apparatus of the control station, and perform a transmitted call processing request, and the plurality of calls. Multiplexing or demultiplexing an ATM cell for a call processing request applied to the plurality of call processing processors, each of which is coupled to a processing processor and assigned variable weights, and checks the priority bits of the ATM cell And a multiplexing / demultiplexing unit for transmitting from the high priority demultiplexed ATM cell to the weighted call processor.

According to the present invention, since the weights assigned to the plurality of call processing processors are dynamically changed according to the call throughput, when the multiplexing and demultiplexing operation is performed, the data transmission capability is changed according to the state of the call processing processor to provide efficient data transmission. It can be realized.

Description

A CALL SIGNALING APPARATUS USING A MULTIPLEXING / DEMULTIPLEXING DEVICE OF AN ASYNCHRONOUS TRANSFER MODE CELL}

The present invention provides a multiplexing / demultiplexing of ATM cells for multiplexing / demultiplexing asynchronous transfer mode (ATM) cells in a Radio Network Controller (RNC) of an international mobile telecommunication system (IMT-2000). A call processing apparatus using a demultiplexing apparatus.

The IMT-2000 system aims to provide high-speed multimedia services and global roaming services, incorporating new system concepts, applications and network technologies into basic technologies applied to existing digital mobile communications and personal communication system (PCS) systems. Next generation mobile communication system.

Therefore, IMT-2000 integrates broadband services such as data and voice and broadband services such as video telephony, video conferencing, and high-speed data transmission into one terminal, and provides multimedia and multimedia services. Provide intelligent services.

The IMT-2000 system is largely based on the synchronous IMT-2000 system using a North American method of Code Division Multiple Access (CDMA) -2000 as a radio access interface. It is divided into asynchronous IMT-2000 system that uses W-CDMA (Wideband-CDMA) of European type which does not use GPS at base station as wireless access interface.

The Radio Network Controller (RNC) of the third generation IMT-2000 performs functions for radio resource management of the IMT-2000 system, manages the base station in the wireless subscriber network, and manages the interface between the RNC and other network elements. In the management, the IMT-2000 system and the existing 2nd generation system have a different structure than the existing 2nd generation base station controller (BSC) because of differences in wireless access standards and wireless subscriber networks. First, IMT-2000's wireless access standards and wireless subscriber network standardization trends related to RNC's functions are divided into various types of wireless channels provided by IMT-2000 wireless access standards, and soft handoff types. And methods are becoming more diverse. In addition, a direct link between RNCs is introduced in the RNC interface, and the base station of the wireless subscriber network, the RNC interface, and the RNC interface are composed of an AAL2 ATM link, and the RNC and core network (CN) interfaces are AAL2 /. It consists of 5 ATM links.

In general, processors that handle call processing of terminals in a control station are connected to an ATM switch port inside the control station to handle call processing based on the ATM transmission method of IMT-2000. However, since a limited number of switch ports must satisfy the call processing capacity of the entire control station, a multiplexing / demultiplexing device is required to allow multiple processors to share the switch ports.

However, conventionally, since the round-robin method of processing the data in the physical layer by multiplexing / demultiplexing the processor in a predetermined order is adopted, it requires fast processing depending on the state of the dynamic application program. A problem arises in that the cell cannot be preferentially processed, an appropriate processing operation suitable for the operating state of the system can be performed, and operation efficiency is reduced.

In addition, although priority / multiplexing / demultiplexing schemes have been developed, this scheme also differs from signaling cells, which are heavily influenced by latency, such as signaling cells related to handover, among cells processed by a particular call processing processor. It can't process the cells before, causing problems with poor system performance or efficiency.

In order to solve the above problems, the technical problem to be achieved by the present invention is a weighted round robin method (Weighted Round-Robin) and the priority that changes the weight according to the operating state of the current processor by a higher application program The purpose is to process the cell so that the latency of the processing time can be adjusted.

In addition, another purpose is to improve communication efficiency by establishing a separate Ethernet path that can communicate with the external devices as well as communication between the internal processors.

1 is a schematic block diagram of a control station including a call processing apparatus according to an embodiment of the present invention.

2 is an internal block diagram of a call processing apparatus according to an embodiment of the present invention.

3 is a detailed block diagram of an ATM multiplexer / demultiplexer according to an embodiment of the present invention.

4 is a detailed block diagram of an Ethernet switching unit according to an exemplary embodiment of the present invention.

The call processing apparatus of the control station for solving the above technical problem,

A plurality of call processing processors capable of dynamically varying a weight for changing a data processing rate according to the call throughput to be processed, and for processing a call request to be transmitted, and

Multiplexing or demultiplexing an ATM cell for a call request applied through the plurality of call processing processors, each of which is coupled to the plurality of call processing processors and is assigned a variable weight, and transmits a priority bit of the ATM cell And a multiplexing / demultiplexing unit for transmitting from the demultiplexed ATM cell having a high priority to the corresponding weighted call processing processor.

Advantageously, said weight is varied by a master call processing processor that is one of said plurality of call processing processors.

The priority is also determined using priority bits that change when handover occurs between base stations.

The multiplexing / demultiplexing unit

A plurality of line drivers each connected to the plurality of call processing processors and connected to the multiplexer / demultiplexer to line match;

A multiplexer / demultiplexer connected to the plurality of line drivers and transmitting the priority bits of the ATM cell to the weighted corresponding call processing processor from the high priority demultiplexed ATM cell;

A memory which is connected to the multiplexer / demultiplexer and stores the ATM cells whose priority is determined by priority;

And a line driver for line matching between the multiplex / demultiplexer and the ATM switch.

Preferably, the call processing apparatus of the control station further includes an Ethernet switching unit having a plurality of Ethernet ports connected to the plurality of call processing processors and an Ethernet port connected to the outside.

Preferably, the memory separates and stores ATM cells demultiplexed into a plurality of buffers according to the determined degree of priority.

The present invention for solving the above technical problem of the present invention is a call that is transmitted through a plurality of call processing processor that handles the call request to be transmitted, the weight that changes the data processing speed is dynamically changed according to the call throughput to process A multiplexing / demultiplexing apparatus for multiplexing and transmitting ATM cells for a request and demultiplexing ATM cells transmitted through an ATM switch to the plurality of call processing processors is provided.

The multiplexing / demultiplexing apparatus of the control station

A multiplexer / demultiplexer which checks a priority bit of the ATM cell and transmits the first priority demultiplexed ATM cell to the weighted call processor;

A plurality of first line drivers respectively connected to the plurality of call processing processors to match each call processing processor with the multiplexer / demultiplexer;

A memory connected to the multiplexer / demultiplexer and storing the priority-determined ATM cells for each priority;

A second line driver for line matching between the multiplex / demultiplexer and an ATM switch

It includes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a control station employing a call processing apparatus according to an embodiment of the present invention, Figure 2 is a block diagram of a call processing apparatus according to an embodiment of the present invention. 3 is an internal block diagram of the multiplexing / demultiplexing unit constituting the call processing apparatus of FIG. 2, and FIG. 4 is an internal block diagram of the Ethernet switching unit constituting the call processing apparatus of FIG.

The structure of an IMT-2000 wireless network control station according to an embodiment of the present invention will be described with reference to FIG.

The IMT-2000 radio network controller (RNC) includes a network matching unit 14 that internally matches a core network (not shown), a base station matching unit 16 that matches a base station (not shown), and an IMT. Control station control unit 12 for controlling the inside of the -2000 wireless network control station, clock unit 11 for synchronizing the inside of the IMT-2000 control station, and operation management unit for the operation and management of the IMT-2000 control station 13 ), A call processing unit 15 that handles call processing between the base station and the core network, and an ATM switch 17 that is connected to these devices and transfers ATM cells for call requests between the base station and the core network to each other.

Next, the structure of the call processing unit 15 will be described in more detail with reference to FIG. 2.

A multiplexer / demultiplexer 23 connected to the ATM switch 17, a plurality of call processing processors (# 0 to # 3) 22, which are connected to the multiplexer / demultiplexer 23, Ethernet switching unit 21 is connected between the call processing processor (# 0 to # 3) 22 and the Ethernet port.

In the call processing unit 15 according to the embodiment of the present invention, the call processing processor of the IMT-2000 control station is mounted in the form of a board as many as the call processing capacity of the IMT-2000 control station is provided. As shown in the embodiment of the present invention, all four call processing processors (# 0 to # 3) 22 are included.

Therefore, a plurality of call processing processors (# 0 to # 3) 22 share and request the ports of the limited ATM switch 17 according to the multiplexing / demultiplexing operation of the multiplexing / demultiplexing unit 23. It can satisfy call processing capacity of.

The plurality of call processing processors (# 0 to # 3) 22 are physical layers that meet the Universal Test Operations PHY interface for ATM (UTOPIA) I and II specifications, and these four call processing processors (# 0 to # The first call processing processor # 1 in 3) 22 serves as a master processor, affecting the reset operation or the initial operation of the other call processing processors # 1 to # 3.

In addition, these plurality of call processing processors (# 0 to # 3) 22 are dynamically weighted according to call throughput and the like by the first call processing processor (# 0) serving as a master processor under the control of an application of a higher concept. Grant. Therefore, a higher weight can be set for a call processing processor that is currently processing a large amount of call processing so that more services can be performed, resulting in an increase in bandwidth. In other words, it is possible to shorten the delay time by improving the processing time.

In addition, when a handover phenomenon occurs in which the base station used is changed or when an emergency call requiring an emergency call service is required, such as when an earlier call processing is required, the base station generates a call request. In this case, the bit value of the corresponding field indicating the priority is changed and transmitted together.

Therefore, it is possible to determine whether or not the priority level is checked by checking the priority bit of the call request currently occurring.

The call processing unit 15 according to the embodiment of the present invention further includes an Ethernet switching unit 21 connected to the Ethernet port. Therefore, this Ethernet port can be used as a communication path for loading initial data and various application programs or operating systems required to initialize the system state.

In addition, since the Ethernet switching unit 21 is mounted, one Ethernet port can be shared by multiple processors (# 0 to # 3) 22, thereby reducing the number of Ethernet ports required and communicating with an external device. Moreover, when a normal ATM path fails, data can be received from each device inside the system and output to an external device, which can be used as a path for analyzing the cause of the system failure.

Next, the structure of the multiplexing / demultiplexing unit 23 according to the embodiment of the present invention will be described in more detail with reference to FIG. 3.

A plurality of line drivers 35 each connected to a plurality of call processing processors (# 0 to # 3) 22 shown in FIG. 2, and multiplexing / connected with output terminals of the plurality of line drivers 35; Static random access (SRAM) connected to the demultiplexer 32, an erasable programmable logic device (EPLD) connected between the multiplex / demultiplexer 32 and the call processing processor # 0, and the multiplex / demultiplexer 32 memory 34 and a line driver 33 connected between the multiplexer / demultiplexer 32 and the ATM switch 17.

The line driver 35 may match data output from the plurality of call processing processors (# 0 to # 3) 22 and transmit the data to the multiplexer / demultiplexer 32 or the reverse path. A line matching function is performed between the multiplexer / demultiplexer 32 and the call processors (# 0 to 3) 22, and the line driver 33 performs a line matching function with the ATM switch 17.

The multiplexer / demultiplexer 32 checks the priority bits of the ATM cells transmitted from the ATM switch 17 side to determine the priority of each ATM cell. Accordingly, the ATM cells are stored for each priority in the corresponding one of the three priority buffers existing in the SRAM 32 according to the priority of the determined cells such as high, medium, and low.

The EPLD 31 allows initialization and control operations of the SRAM 34 and the multiplexer / demultiplexer 32 by the first call processing processor # 0.

Therefore, as described above, since the first call processing processor # 0 of the four call processing processors # 0 to # 3 22 serves as the master processor of the entire apparatus, the operation state inside the system is initialized. The call processing processor # 0 checks the state of the SRAM 34, allocates a priority buffer through the EPLD 31, and initializes weights for each physical layer and priority of the corresponding cell.

Then, when a call processing request is generated through a plurality of base stations, and call processing data is transmitted through the base station matching unit 16 and the ATM switch 17 in the form of an ATM cell, each corresponding call processing processor 22 is entered. After the appropriate processing in the transmission through the corresponding line driver 35 to the multiplexing / demultiplexer (32).

Then, the multiplexing / demultiplexing unit 32 multiplexes the cells applied through the various line drivers 35 and transmits the multiplexed cells to the core network or the base station through the line driver 33.

In this case, since the weights of the call processing processors (# 0 to # 3) 22 of the physical layer are dynamically changed according to the call throughput, the bandwidth may be adjusted according to the set weight to efficiently reduce the transmission speed of ATM cells. .

Conversely, the demultiplexing process is as follows.

ATM cells transmitted from the ATM switch 17 side through the line driver 33 are demultiplexed by the multiplexer / demultiplexer 32, and then the bit values of the priorities are checked, and thus each set such as high, medium, or low. By priority, it is stored in the buffer among three priority buffers in the SRAM 32 allocated to each call processing processor.

In this way, ATM cells according to priorities for each call processing processor are classified and stored in the corresponding buffer of the SRAM 34, and then the multiplexer / demultiplexer 32 becomes a priority when the service order of the corresponding call processing processor is reached. Each ATM cell is transmitted to the call processor.

Therefore, priority calls are considered before ordering call requests, so that call requests with higher priority can be processed first. Therefore, it can be transmitted to the corresponding base station through each corresponding call processing processor.

As described above, since a high priority call request is processed first in the demultiplexing process, a call with a high time delay can be processed first to increase user satisfaction.

In addition, as described above, since the weights of the plurality of call processing processors (# 0 to # 3) 22 vary in operation according to the call throughput, the processing speed is also improved.

Next, the structure of the Ethernet switching unit 21 will be described in more detail with reference to FIG. 4.

The Ethernet switching unit 21 according to an embodiment of the present invention supports a transformer 41 for performing line matching with a plurality of call processing processors (# 0 to # 3) 22 and an IEEE 802.3 physical layer. Transceiver 42, Ethernet switch controller 43 for controlling the switching operation with the Ethernet port, Synchronous Graphic Dynamic Random Access Memory (SGRAM) 44 for temporarily storing packets, Ethernet switch controller 45 An EEPROM (Electrically Erasable Programmable Read-Only Memory) 45 in which initialization values are stored, and an EPLD 46 for controlling the reset operation and timing of the Ethernet switching unit 21 are included.

When operation of the Ethernet switching unit 21 having such a structure starts, first, the state of the Ethernet switch controller 45 that controls the overall control operation is initialized to an initialization value stored in the EEPROM 45. Accordingly, the data of each call processing processor (# 0 to # 3) 22 inputted through the transformer 41 by the reset operation and timing under the control of the EPLD 46 is input through the Ethernet port connected to the outside of the device. Data is temporarily stored in the memory 44 via the transceiver 42 and then switched to the corresponding port by the Ethernet switch controller 43.

Ethernet switching unit 21 according to an embodiment of the present invention has a maximum of eight switching ports, four of which are connected to four call processing processors (# 0 to # 3) 22, only one It is connected to an Ethernet port external to this device.

Therefore, four call processing processors (# 0 to # 3) 22 can share one Ethernet port, so that four processors (# 0 to # 3) 22 can be arbitrarily connected to one Ethernet port. Ethernet communication with other processors is possible.

In addition, since an Ethernet port communicating with the outside is provided separately from the ports for call processing processors (# 0 to # 3) 22, it is a communication port for loading data or various applications required for initializing the state of the system. It is available.

In addition, when a normal ATM path fails, it can be used as a path that can receive data from each device inside the system and output it to the outside to analyze the cause of the system failure. .

In the present invention as described above, since the weights assigned to the plurality of call processing processors are dynamically changed according to the call throughput, when the multiplexing and demultiplexing operation is performed, the data transmission capacity is changed according to the state of the call processing processor, thereby efficiently transmitting data. To realize.

In addition, when demultiplexing is performed, the processing order is determined according to the priority of ATM cells, so that a cell that consumes a lot of time delay or requires rapid processing can be processed first, thereby improving processing efficiency and reducing delay time. have.

Claims (9)

A plurality of call processing processors capable of dynamically varying a weight for changing a data processing rate according to the call throughput to be processed, and for processing a call request to be transmitted, and Multiplexing or demultiplexing an ATM cell for a call request applied through the plurality of call processing processors, each of which is coupled to the plurality of call processing processors and is assigned a variable weight, and transmits a priority bit of the ATM cell A multiplexing / demultiplexing unit for transmitting from the demultiplexed ATM cell having a high priority to the corresponding weighted call processing processor Call processing apparatus of the control station comprising a. In claim 1, And wherein the weight is changed by a master call processing processor that is one of the plurality of call processing processors. In claim 1, And said priority is determined using a priority bit that changes when a handover occurs between base stations. In claim 1, The multiplexing / demultiplexing unit A plurality of line drivers connected to the plurality of call processing processors and line matched with each other, A multiplexer / demultiplexer connected to the plurality of line drivers and transmitting the priority bits of the ATM cell to the weighted corresponding call processing processor from the high priority demultiplexed ATM cell; A memory which is connected to the multiplexer / demultiplexer and stores the ATM cells whose priority is determined by priority; A line driver for line matching between the multiplexer / demultiplexer and an ATM switch Call processing apparatus of the control station comprising a. In claim 4, And said memory separates and stores ATM cells demultiplexed into a plurality of buffers according to the determined degree of priority. In claim 1, And a plurality of Ethernet ports connected to the plurality of call processing processors and an Ethernet port connected to the outside, and further comprising an Ethernet switching unit. The weight of the data processing rate is dynamically changed according to the call throughput to be processed, and the ATM switch is multiplexed and transmitted to the call request transmitted through a plurality of call processing processors that process the transmitted call request. In a multiplexing / demultiplexing apparatus of a control station for demultiplexing an ATM cell transmitted through the same and transmitting it to the plurality of call processing processors, A multiplexer / demultiplexer which checks a priority bit of the ATM cell and transmits the first priority demultiplexed ATM cell to the weighted call processor; A plurality of first line drivers respectively connected to the plurality of call processing processors to match each call processing processor with the multiplexer / demultiplexer; A memory connected to the multiplexer / demultiplexer and storing the priority-determined ATM cells for each priority; A second line driver for line matching between the multiplex / demultiplexer and an ATM switch Multiplexing / demultiplexing apparatus of the control station comprising a. In claim 7, Wherein the priority is determined using a priority bit that is changed when a handover occurs between base stations. In claim 7, And said memory separates and stores ATM cells demultiplexed into a plurality of buffers according to the determined degree of priority.