KR100697775B1 - System for call processing in CDMA 1x EV-DO network - Google Patents

Abstract

The present invention relates to a call processing system in a CDMA 1x EV-DO network. In particular, the present invention relates to a virtual exchange (MSC) by integrating two exchanges (MSCs) into one virtual exchange (MSC) at an edge of an exchange (MSC) of an EV-DO network. By providing a data call processing service to a data location register (DLR) relates to a technology that can provide a high quality service without increasing radio resources and systems even when traffic (Traffic) increases.

According to the present invention, in a call processing system in a CDMA 1x EV-DO network, an air controller (ANC), an exchange (MSC), a data location register (DLR), and a home data location register (HDLR) are interoperable with each other. However, at least two exchangers (MSC) are integrated into one virtual exchange (MSC) to be connected to one data location register (DLR) to provide a call processing system, characterized in that to provide a data call processing service.

EV-DO, Call Processing, Exchange (MSC), Data Locator (DLR)

Description

System for call processing in CDMA 1x EV-DO network

1 is a block diagram of a call processing system of a conventional CDMA 1x EV-DO.

2 is a block diagram of a call processing system of a CDMA 1x EV-DO according to the present invention.

<Description of Symbols for Major Parts of Drawings>

11,12,13,14: Access Network Control (ANC)

21,22,23,24: Mobile Switching Center (MSC)

31,32: Data Location Register (DLR)

40: Home Data Location Register (HDLR)

The present invention relates to a call processing system in a CDMA 1x EV-DO network. More specifically, at the MSC boundary of the EV-DO network, two exchanges (MSCs) can be integrated into one virtual exchange (MSC) to provide a data call processing service with one data location register (DLR). It is about technology.

In general, the CDMA 1x EV-DO wireless network is a new packet wireless data transmission technology developed by Qualcomm using CDMA technology to enable high-speed mega-class data transmission. The transmission speed is also 2.4 Mbps in the forward direction and 307.2 Kbps in the reverse direction, which is implemented in the same wireless system as the ADSL method used in the wire.

The CDMA 1x EV-DO emerged as an IMT-2000 MC (Multi-Carrier, Synchronous) 1x RTT system developed to support both voice and data, but has been commercialized and tested, but transmits high-speed data in the 1.25 MHz band. Not only is there a limit to this, but IS-95 does not support more than 144Kbps, so it appeared as a complementary solution for high-speed data transmission.

CDMA 1x EV-DO connects data-only Internet through DCN (Data Core Network) in existing IS-95 network, and can support data transmission speed in third generation (3G) network as existing speed. The CDMA 1x EV-DO has an average forward data rate of several hundred kbps, but the radio frequency bandwidth used is 1.25MHz, the same as the cell phones used in current CDMA One.

Considering that 5MHz bandwidth is required to provide 384kbps service in IMT-2000, it can be said that the system has very high frequency utilization efficiency. CDMA 1x EV-DO is designed in a way that is suitable for data communication that is not affected by delay or moment when the transmission data that can speed up bandwidth narrower than the frequency bandwidth of IMT-2000 is burst data such as internet. Because there is.

In addition, the CDMA 1x EV-DO performs a function of automatically adjusting the reverse transmission rate in the base station according to the call quality between the terminal and the base station. This function is possible by monitoring the signal of the terminal received from the base station every 1.67m / s to determine the call quality to adjust the priority and speed of data transmission to the terminal.

The terminal with less radio interference near the base station preferentially transmits at a higher transmission speed and improves the communication quality of data by reducing the communication speed to a terminal far from the base station.

A general wireless network is classified into a wireless public network and a wireless private network used by a group or company having a specific purpose, and the wireless private network is configured to interwork with a specific wireless public network, but the CDMA 1x EV-DO wireless network is different from the general wireless network. Otherwise, only public EV-DO wireless network service provided by mobile communication service provider existed, and private (premises) EV-DO wireless network service did not exist.

Accordingly, methods for using a part of public EV-DO networks as private EV-DO wireless networks are being developed. This method is such that one mobile communication terminal provides a service of a private EV-DO wireless network in a specific area (premises) and a service of a public EV-DO wireless network in other areas.

Meanwhile, in order to provide data service in a CDMA 1x EV-DO network, an interface technology between an MSC (GAN) and a data location register (DLR) is required. The current known technique is a 1: 1 connection between the exchange (MSC) 21, 22, 23, 24 and the data location register (DLR) 31, 32, 33, 34 as shown in FIG. Formed.

If traffic between MSCs increases, the system will be expanded, and hand-off between MSCs is frequently performed, causing deterioration of quality and radio resources in the boundary area between MSCs. Increasing the use of, caused many problems, such as customer complaints due to subscriber DB mismatch.

That is, in the MSC boundary area, the problem is that the IDR H / O and the IH during the call are changed as the identifier (UATI) information is changed in the data location register (DLR). UATI reallocation and H / O (A13) messages will increase.

Accordingly, 1) a problem occurs in that radio resources and DLR system resources (UATI) are repeatedly allocated and released (load increase), and 2) A13 H / O messages occupy the largest proportion of DLR protocol messages. In the case of a mobile communication terminal having an MSC boundary as a radio wave environment, frequent handoffs (H / Os) cause inconsistencies in location information (DB), and 3) UATI allocation and handoffs (H / Os). The message is broken up into several stages of messages, from start to finish, resulting in a system degradation.

Accordingly, the present invention is to solve the above problems, the present invention is to integrate the two exchangers (MSC) into one virtual exchanger (MSC) at the MSC boundary region of the EV-DO network, one data location register By providing a data service through the DLR, the purpose of the present invention is to provide a high-quality service without increasing radio resources and systems even when traffic increases.

As the technical idea for achieving the above object of the present invention

In a call processing system in a CDMA 1x EV-DO network,

An air controller (ANC), an exchanger (MSC), a data location register (DLR) and a home data location register (HDLR) are interoperated with each other,

A call processing system is provided by integrating at least two switching centers (MSCs) into one virtual switching center (MSC) to be connected to one data location register (DLR) to provide a data call processing service.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment of the present invention will be described in detail.

2 is a block diagram of a call processing system of a CDMA 1x EV-DO according to the present invention.

Referring to FIG. 2, four exchangers (MSCs) 21, 22, 23, and 24 having respective ANCs 11, 12, 13, and 14 are divided into two groups, one DLR 31, 32, The DLRs 31 and 32 are connected to the HDLR 40.

That is, two MSCs 21 and 22 are integrated into one virtual MSC to provide a data call processing service to one DLR 31. This is different from a call processing system having a 1: 1 connection between an exchange (MSC) 21, 22, 23, 24 and a data location register (DLR) 31, 32, 33, 34 as shown in FIG. There is a difference.

Subsequently, the functions of each component will be described. The ANCs 11, 12, 13, and 14 are connected to respective global area networks (GANs) as public controllers, and call requests are requested. It relays the connection request signal.

MSC (Mobile Switching Center) 21, 22, 23, 24 is a switch between the ANC (11, 12, 13, 14) and the DLR (31, 32) to perform call setup and release of the mobile communication terminal, etc. It performs various functions related to call processing and additional services, and enables interworking with other networks.

The data location registers (DLRs) 31 and 32 serve as databases for storing information (MIN) and location information of a mobile communication terminal registered in an EV-DO wireless network as a data location register.

HDLR (Home Data Location Register) 40 is a home data location register and serves as a database that stores information and location information for each DLR (31, 32).

In the EV-DO network call processing system of the present invention configured as described above, an A13 (Hand-Off) message and an identifier (UATI) of the DLRs 31 and 32 are allocated.

That is, UATI (Unicast Access Terminal ID), which is a resource of the DLRs 31 and 32, is 32Bit, and has a Color Code (8bit) + DSN_No (3bit) + UATI Pool (17bit) + DB Index (4bit) structure of the DLR. Code is assigned to one MSC,

Therefore, if one color code is virtually assigned by assigning the same color code to two MSCs, the DLR (31, 32) operates like one MSC, and the UATI resource and A13 message itself disappear from the boundary area. It will be possible to dramatically reduce the quality and resources (1/2).

As described above, the present invention has been described with reference to exemplary embodiments, but these descriptions should not be interpreted in a limiting sense.

Those skilled in the art to which the present invention pertains will be apparent that various exemplary embodiments may be added, defined, or implemented in various ways with reference to the detailed description of the invention. Accordingly, the claims set forth below should be regarded as including both such modifications and embodiments.

As described above, according to the call processing system in the EV-DO network according to the present invention, when the MSC is expanded due to the increase in traffic, without additional purchase of a DLR (cost reduction), two MSCs are stored in one virtual MSC. By integrating the data into a single DLR, the data is increased, but traffic can be increased, but high-quality services can be provided without expanding radio resources and systems. Thus, the present invention can improve the performance and quality of the system.

Claims (4)

In a call processing system in a CDMA 1x EV-DO network, An air controller (ANC), an exchanger (MSC), a data location register (DLR) and a home data location register (HDLR) are interoperated with each other, And provide at least two exchanges (MSCs) into one virtual MSC (VMSC) to be connected to one data location register (DLR) to provide data call processing services. The method according to claim 1, wherein the DLR after the handoff receives an A13 (Hand-Off) message from the DLR before the handoff in order to provide a data call processing service in the call processing system, and the DLR after the handoff is assigned to the mobile terminal. UATI). The call processing method according to claim 1, wherein the identifier (UATI), which is a resource of the DLR, is 32Bit and has a color code (8bit) + DSN_No (3bit) + UATI Pool (17bit) + DB Index (4bit) structure of the DLR. system. The call processing system according to claim 1 or 3, wherein the color codes are identically assigned to two MSCs to virtually assign one color code to operate as one MSC in the DLR.

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