KR100447697B1 - Apparatus for line interface unit of radio network controller in wireless telecommunication system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a base station matching device in a wireless communication control station and a cell processing method thereof.

2. The technical problem to be solved by the invention

According to the present invention, a bandwidth-adjustable function (IMA function) and a T1 / E1 link according to the amount of data while using an existing T1 / E1 link that connects a base station (Node-B) and a control station (RNC) in the next generation mobile communication system as it is. To provide a base station matching device and a cell processing method in a control station having an AAL type conversion function for efficient use of the CDMA.

3. Summary of the Solution of the Invention

The present invention relates to a method for processing an asynchronous transfer mode (ATM) cell in a base station matching device in a wireless communication control station, wherein a plurality of ATM Adaptation Layer (AAL) type ATM cells coming from an ATM switch are changed into one AAL2 type. AAL5 / AAL2 conversion step for transmitting to the base station; An AAL2 / AAL5 conversion step of converting the AAL2 type ATM cell transmitted from the base station into an AAL5 type ATM cell for use by a known ATM exchanger capable of processing only the AAL5 cell; IMA (Inverse Multiplexing for ATM) function that can adjust the bandwidth of the band (T1 / E1) link.

4. Important uses of the invention

The present invention is used in a wireless communication system and the like.

Description

Apparatus for line interface unit of radio network controller in wireless telecommunication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station matching apparatus and a cell processing method thereof in a wireless communication control station, and more particularly, to a base station (Node-B) in a next generation mobile communication system such as International Mobile Telecommunication (IMT-2000) and Universal Mobile Telecommunications System (UMTS). Inverse Multiplexing for ATM (IMA) function that enables wide bandwidth while using a narrowband T1 / E1 link between the RNC and Radio Network Controller (RNC), and AAL for efficient operation of the T1 / E1 link (ATM Aaptation Layer) The present invention relates to a base station matching device in a control station having a conversion function and a cell processing method thereof.

1 is an exemplary configuration diagram of a general next generation mobile communication system, in which "11" is a mobile station (UE), "12" is a base station (Node-B), "13" is a control station (RNC), " 14 " represents an exchange station, " 15 " a base station matching device, " 16 " an Asynchronous Transfer Mode (ATM) switch, and " 17 "

The next generation mobile communication system is a control station (RNC) connected to a plurality of mobile stations 11 (UE), a plurality of base stations (Node-B) 12, a plurality of base stations (Node-B) 12 by an E1 link ( 13 and an exchange station 14 connected to a control station (RNC) 13 by an optical link.

A mobile station (UE) 11 transmits and receives voice information with a base station (Node-B) 12 via a wireless network. In addition, a mobile station (UE) 11 transmits data with a base station (Node-B) 12 via a wireless network, and transmits and receives data to and from a personal computer (PC) via an adapter.

The control station (RNC) 13 is a base station matching device 15 for matching a physical T1 / E1 link with a Node-B 12, and ATM header conversion and switching according to the address of the input data. A switch 16, an exchange station matching device 17 for connecting to the switch station 14 via an optical link.

In the next generation mobile communication network, the amount of data that can be transmitted from a mobile station (UE) 11 transmits and receives a large amount of data up to and including video information, not only audio data, as in a conventional mobile communication network, and a base station (Node-B). (12) and the control station (RNC) 13 must be able to accept and process the above data.

In order to satisfy the above requirements, the bandwidth of the transmission line between the base station (Node-B) 12 and the control station (RNC) 13 must be increased, and the connection bandwidth of the existing T1 / E1 link is transmitted. You will need to replace this large DS3 (S5Mbps), STM1 (155Mbps) link.

However, when a large bandwidth DS3 (S5 Mbps) or STM1 (155 Mbps) link is used to process a large amount of data transmitted and received between the base station (Node-B) 12 and the control station (RNC) 13, There is a problem that the installation cost and maintenance cost of the line is high, and that the use of a large amount of transmission lines is difficult to efficiently use for a variable amount of data in which a small amount of data such as audio and a large amount of information such as video information are mixed.

The present invention has been proposed to solve the above problems, and in the next generation mobile communication system, the existing T1 / E1 link connecting the base station (Node-B) and the control station (RNC) is used as it is. It is an object of the present invention to provide a base station matching device and a cell processing method in a control station having a bandwidth adjustable function (IMA function) and an AAL type conversion function for efficiently using a T1 / E1 link.

1 is an exemplary configuration diagram of a general next generation mobile communication system.

2A is an explanatory diagram showing an IMA function used in the present invention.

2B is a diagram illustrating a cell processing method according to AAL type conversion of an ATM cell according to the present invention;

3 is an overall configuration diagram of an embodiment of a base station matching device in a wireless communication control station according to the present invention.

Figure 4 is a detailed configuration of one embodiment of the UTOPIA interface unit of the third in accordance with the present invention.

5 is a detailed configuration diagram of an embodiment of the type conversion unit of FIG. 3 according to the present invention;

6 is a detailed configuration diagram of an embodiment of the line interface unit of FIG. 3 in accordance with the present invention.

7 is a detailed diagram of an embodiment of the processor unit of FIG. 3 according to the present invention;

* Explanation of symbols for the main parts of the drawings

15: base station matching device 31: line interface unit

32: type conversion unit 33: UTOPIA interface unit

34: control unit 35: processor unit

36 power supply

The present invention for achieving the above object is a base station matching apparatus in a wireless communication control station, comprising: power supply means for supplying operation power to each module in the base station matching apparatus; Control means for generating a control signal for an ATM adaptation layer (AAL) type conversion function; First matching means for matching with an asynchronous transfer mode (ATM) switch in accordance with the control signal; Converting the AAL5 type traffic ATM cell to be transmitted to the base station into the AAL2 type based on the header information of the input ATM cell according to the control signal, and converting the AAL2 type traffic ATM cell input from the base station into the AAL5 type, The control cell includes type conversion means for converting and bypassing only the ATM header; And second matching means for matching with the base station through a communication link, converting an ATM cell to the base station according to the control signal, converting a cell input from the base station to an ATM cell, and transmitting the converted cell to the type converting means. The first matching means includes receiving a control signal of the control means at the initialization of the base station matching device to prevent the inflow of ATM cells from an external UTOPIA interface, and the control means at the end of initializing the base station matching device. A buffer unit which signals to open a buffer to receive an ATM cell from outside; And a first-in first-out (FIFO) unit for storing at least one ATM cell flowing into the outside.

Meanwhile, the present invention provides a method for processing an Asynchronous Cell (ATM) cell in a base station matching device in a wireless communication control station, wherein a plurality of ATM Adaptation Layer (AAL) type ATM cells coming from an ATM switch are configured as one AAL2. AAL5 / AAL2 conversion step of transmitting to the base station in turn; An AAL2 / AAL5 conversion step of converting the AAL2 type ATM cell transmitted from the base station into an AAL5 type ATM cell for use by a known ATM exchanger capable of processing only AAL5 cells; Inverse Multiplexing for ATM (IMA) function that can adjust the bandwidth of the band (T1 / E1) link.

The present invention provides an IMA function capable of adjusting bandwidth of a T1 / E1 link of a control station that is matched with a plurality of base stations, and a function of converting an AAL5 type ATM cell from an AAL5 type ATM cell for efficient use of the T1 / E1 link. In order to use an existing ATM switch that can be applied only to AAL5 type ATM cells, an AAL2 type ATM cell transmitted from a plurality of base stations is converted into an AAL5 type ATM cell.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Supports Inverse Multiplexing for ATM (IMA) scheme for bandwidth adjustment according to data amount while using the T1 / E1 link connecting the base station (Node-B) 12 and the control station (RNC) 13 of FIG. A dedicated chip (MT90220) is used. The specification of the IMA function is disclosed in the document "AF-PHY-0086.001" designated by "The ATM Forum Technical Committee."

The IMA function will now be described with reference to FIG. 2A.

As shown in Fig. 2A, the transmitting IMA access device 21 and the receiving IMA access device 22 are connected by a plurality of physical links composed of a low speed link (T1 / E1 link).

The transmitting IMA access device 21 distributes one ATM cell stream received from the ATM layer into a plurality of streams, and then transmits the same to the receiving IMA access device 22 through the corresponding plurality of physical links. do.

The receiving side IMA access unit 22 combines the plurality of streams received through the physical layers into one ATM cell stream and then transmits the same to the ATM layer.

The ATM cell stream distribution in the transmitting IMA access device 21 and the ATM cell stream combination in the receiving IMA access device 22 are usually made in a round robin sequence. By doing this, several physical links are made into one IMA virtual link, and the bandwidth is set to "T1 / E1 x link count".

Therefore, in the base station (Node-B) 12 that accommodates a large number of subscribers, when a large number of T1 / E1 links are allocated and used in a group, a large amount of data can be accommodated, and conversely, the number of subscribers or the amount of data transmitted and received The less base station (Node-B) 12 can easily adjust the bandwidth of the base station (Node-B) 12 and the control station (RNC) 13 by allocating fewer T1 / E1 links and using them as a group.

When transmitting an ATM cell containing small information data such as voice, it is more efficient to bundle multiple data than to transmit it to AAL5 type ATM cell. It is more efficient to bundle and transmit multiple AAL5 type ATM cells to an ATM cell.

Now, the AAL type conversion method of the ATM cell will be described in more detail with reference to FIG. 2B.

Looking at the AAL type conversion method, the type conversion device 23 converts a plurality of AAL5 type ATM cells coming from the ATM switch 16 into a single AAL2 form and transmits them to the base station (Node-B) 12, and the base station ( The AAL2 type ATM cell transmitted from Node-B) 12 is converted into an AAL5 type ATM cell so that an existing ATM switch that can process only AAL5 cells can be used to enable efficient link use.

Here, the process of converting an AAL2 type ATM cell transmitted from the base station (Node-B) 12 into an AAL5 type ATM cell and transmitting the pulse signal comprises converting a T1 / E1 signal input from the base station (Node-B) 12 into a pulse code. After converting the signal to a modulation (PCM) signal, converting the PCM signal to an ATM cell type, the AAL type of the ATM cell is converted using the header information and transmitted to the ATM switch 16.

The base station matching device 15 in the control station (RNC) 13 according to the present invention will be described in more detail with reference to FIG.

As shown in Fig. 3, the base station matching device 15 in the control station (RNC) 13 according to the present invention is characterized in that the UTOPIA interface 33 for matching with the ATM switch 16 and the efficient linking of the E1 link are performed. For use, the AAL5 type traffic ATM cell is changed to AAL2 type, the AAL2 type traffic ATM cell is changed to AAL5 type, and the control cell is a type conversion unit 32 which transmits only the header and transmits the ATM cell to the E1 line. And a line interface unit 31 having an IMA function, a control unit 34, a processor unit 35, and a power supply unit 36 for controlling the respective modules.

In more detail, the base station matching device 15 in the control station (RNC) 13 according to the present invention includes a power supply unit 36 for supplying operating power to each module in the base station matching device 15, and AAL. (ATM Adaptation Layer) A control unit 34 and a processor unit 35 for generating a control signal for the function of converting the function, and according to the control signal, asynchronous transfer mode (ATM) switch 16 to match the utopia (UPOTIA) In accordance with the interface unit 33 and the control signal, the AAL5 type traffic ATM cell to be transmitted to the base station (Node-B) 12 is converted to the AAL2 type based on the header information of the input ATM cell. B) converts the AAL2 type traffic ATM cell inputted from B) 12 into the AAL5 type, and the control cell converts only the ATM header to bypass the type conversion unit 32 and, according to the control signal, through a communication link. Matches with the base station (Node-B) 12, converts the ATM cell to the base station (Node-B) 12 Transmission, and includes a line interface unit 31 for transferring a cell inputted from the base station (Node-B) (12) to convert ATM cells to type converting unit 32 to the.

The utopia interface unit 33 performs a UTOPIA interface matching function with the ATM switch 16.

The type converting unit 32 converts the AAL5 type ATM data cell to AAL2 when the ATM cell is transmitted to the base station Node-B 12, and the AAL2 type ATM data cell inputted from the base station Node-B 12 is Converts to an AAL5 type ATM cell. The control cell converts and bypasses only the ATM header.

The line interface unit 31 converts the ATM cell inputted from the ATM switch 16 into an E1 signal for E1 matching with the base station Node-B 12 and transmits the signal to the base station Node-B 12. The base station (Node-B) 12 serves to convert the cell inputted by the E1 signal to the ATM cell to transmit to the ATM switch 16.

The control unit 34 performs an address decoding function, an LED control, an external clock signal, a selection and distribution of an internal clock signal, a board fault signal, and a board fault signal to a fault handling board, including control signals between external function modules. .

The processor unit 35 performs operation and management (OAM) register value setting for controlling various modules in the base station matching device 15, collects and manages system data, and manages internal message communication centered on interrupt processing. To perform a function.

The power supply unit 36 is a module for supplying the operating power in the base station matching device 15 and is in the form of an ON-board (mounted in the board), and receives -48V as an input to each device mounted on the board. Supply the necessary power supply (5V, 3.3V, 2.5V). By taking the power supply unit 26 in the form of an ON-board, when a power supply is required for each device, the device malfunction due to the voltage drop of the system away from the power supply board can be reduced.

Now, the utopia interface unit 33 in the base station matching device 15 will be described in more detail with reference to FIG. 4.

As shown in FIG. 4, the UTOPIA interface unit 33 includes a first in first out (FIFO) unit 41 and a buffer unit 42.

The buffer unit 42 receives a signal from the control unit 34 at the time of initialization of the base station matching device 15 to prevent the inflow of ATM cells from the external UTOPIA interface, and when the base station matching device 15 is finished initializing, the control unit 34 transmits to the control unit 34. Signal to open a buffer so that ATM cells can be received from outside. This prevents board malfunction due to ATM cell ingress during board initialization.

The first-in-first-out (FIFO) unit 41 functions to store ATM cells introduced to the outside, so that ATM cells can be continuously input from the outside without greatly depending on the ATM processing capability in the base station matching device 15. Make sure

Meanwhile, the type conversion unit 32 in the base station matching device 15 will be described in more detail with reference to FIG. 5.

As shown in Fig. 5, the type converter 32 includes a content addressable memory (CAM) 51 for AAL2 / 5 conversion, an AAL2 / 5 converter 52, and an AAL5 / 2 converter ( 53c) and CAM 54 for AAL5 / 2 conversion.

The AAL2 / 5 converting unit 52 converts an AAL2-type ATM traffic cell input from the base station Node-B 12 into an AAL5-type ATM cell by converting the ATM cell header, and the base station Node-B 12 ) Converts the AAL5 type ATM control cell inputted from) into an ATM cell header and transmits it to the AAL5 type ATM cell. At this time, the header conversion information is in the AAL2 / 5 conversion CAM 51.

The AAL5 / 2 conversion unit 53 converts an AAL5 type ATM traffic cell input from the switching center 14 into an AAL2 type ATM cell by converting an ATM cell header, and converts the AAL5 type ATM control cell input from the switching center 14 into an AAL5 type ATM control cell. It converts ATM cell header and transmits it to AAL5 type ATM cell. At this time, the header conversion information is in the AAL 5/2 conversion CAM 54.

On the other hand, the line interface unit 31 in the base station matching device 15 will be described in more detail with reference to FIG. 6 as follows.

As shown in FIG. 6, the line interface unit 31 includes a framer 61 and an inverse multiplexing over ATM (IMA) unit 62.

The IMA unit 62 performs a function of converting an ATM cell input through the UTOPIA interface into a PCM signal suitable for the T1 / E1 framer 61. It also performs the reverse function. The IMA dedicated chip MT90220 may use 16 E1 links, or may be used in groups of up to eight groups.

The framer 61 converts the PCM signal input from the IMA unit 62 into a T1 / E1 signal for the E1 link and its reverse function.

On the other hand, the processor 35 in the base station matching device 15 will be described in more detail with reference to FIG.

As shown in FIG. 7, the processor unit 35 includes an ATM communication processor 71 having a UTOPIA interface, a control signal line, and a memory interface, and a memory unit (including EEPROM and SRAM) 72 storing information on system operation. It consists of a 10Mbps Ethernet connection 73 and a serial port connection 74 for board debugging, and manages internal message communication centered on interrupt processing. That is, functions such as setting operation and management (OAM) register values for controlling various modules in the base station matching device 15, collecting and managing system data, and managing internal message communication centered on interrupt processing, etc. Perform.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention can vary the transmission bandwidth by designating a plurality of E1 (2.048 Mbps) / T1 (1.544 Mbps) lines, which are widely used in the base station matching device, as a group according to the amount of transmission / reception data. Implementing a device with an IMA function can reduce the ease, maintenance, and maintenance costs of implementing a next-generation mobile communication system.

In addition, in the present invention, when transmitting and receiving small data, such as voice, between the base station and the control station, converting to an AAL2 type ATM cell has an effect that the T1 / E1 link can be used more efficiently than the conventional AAL5.

In addition, the present invention converts an AAL2 type ATM cell transmitted from a base station into an AAL5 cell, so that an existing ATM switch capable of processing only an AAL5 type ATM cell can be used, and thus, an existing mobile communication system can be utilized in implementing a next generation mobile communication system. It has an effect.

Claims (7)

delete A base station matching device in a wireless communication control station, Power supply means for supplying operation power to each module in the base station matching device; Control means for generating a control signal for an ATM adaptation layer (AAL) type conversion function; First matching means for matching with an asynchronous transfer mode (ATM) switch in accordance with the control signal; Converting the AAL5 type traffic ATM cell to be transmitted to the base station into the AAL2 type based on the header information of the input ATM cell according to the control signal, and converting the AAL2 type traffic ATM cell input from the base station into the AAL5 type, The control cell includes type conversion means for converting and bypassing only the ATM header; And A second matching means for matching with the base station through a communication link, converting an ATM cell to the base station according to the control signal, and converting a cell input from the base station to an ATM cell for transmission to the type converting means. Including, The first matching means, When the base station matching device is initialized, the control signal of the control unit is received to prevent the inflow of ATM cells from an external UTOPIA interface, and when the base station matching device is terminated, the control unit is signaled to open a buffer to open an ATM cell from the outside. A buffer unit to receive the; And First in, first out (FIFO) unit for storing at least one ATM cell flowing out Base station matching device in a wireless communication control station comprising a. The method of claim 2, The second matching means, An Inverse Multiplexing for ATM (IMA) unit for converting an ATM cell inputted through a UTOPIA interface into a PCM signal suitable for a T1 / E1 framer and performing a reverse function thereof; Framer converts PCM signal input from IMA to T1 / E1 signal for E1 link and performs the reverse function Base station matching device in a wireless communication control station comprising a. The method of claim 2 or 3, The type conversion means, A content addressing memory (CAM) for AAL2 / 5 conversion which stores information necessary for AAL2 / 5 conversion; Based on the AAL2 / 5 conversion information stored in the AAL2 / 5 conversion CAM, the AAL2 type ATM traffic cell input from the base station is converted into an AAL5 type ATM cell by converting an ATM cell header, and the AAL5 type input from the base station. An AAL2 / 5 conversion unit for converting an ATM control cell into an AAL5 type ATM cell by converting an ATM cell header; A content addressing memory (CAM) for AAL5 / 2 conversion which stores information necessary for AAL5 / 2 conversion; And Based on the AAL5 / 2 conversion information stored in the AAL5 / 2 conversion CAM, the AAL5 type ATM traffic cell input from the switching center is converted into an AAL2 type ATM cell by converting an ATM cell header, and the AAL5 type ATM control input from the switching center is input. AAL5 / 2 converter that converts an ATM cell header to an AAL5 type ATM cell Base station matching device in a wireless communication control station comprising a. The method of claim 4, wherein The control means, A base station matching device in a wireless communication control station, characterized in that the monitoring of ATM cell processing through an Ethernet port and a serial port. A method of processing asynchronous transfer mode (ATM) cells in a base station matching device in a wireless communication control station, An AAL5 / AAL2 conversion step of converting a plurality of ATM Adaptation Layer (AAL) type 5 ATM cells from the ATM switch into one AAL2 form and transmitting the same to the base station; AAL2 / AAL5 conversion step of converting the AAL2 type ATM cell transmitted from the base station to an AAL5 type ATM cell to be used by a known ATM switch that can process only AAL5 cells, And performing an inverse multiplexing for ATM (IMA) function for adjusting bandwidth of a narrowband (T1 / E1) link of the control station matched with the base station. The method of claim 6, The AAL2 / AAL5 conversion step, Converting the T1 / E1 signal input from the base station into a pulse code modulation (PCM) signal; Converting the PCM signal to an ATM cell type; Receiving the ATM cell and converting an AAL type using header information; And Transmitting the converted ATM cell to the ATM switch Cell processing method of a base station matching device in a wireless communication control station comprising a.