KR100735472B1 - System and method for voice call soft hand-off between all ip mobile network and legacy mobile network - Google Patents

Abstract

A system and a method for performing voice call soft handoff between an ALL IP mobile communication network and an existing mobile communication network are provided to contribute to gradually evolve a mobile communication network from an existing network to an ALL IP network. When an MS(Mobile Station)(10) performs voice call handoff during voice call communication with one of a base station of an ALL IP network and a base station of an 1X network to the other base station, a handoff matching unit(40) converts a handoff message transmitted between an ALL IP network system and the 1X network system and transfers it. The handoff matching unit(40) converts a handoff message of an E1 HDLC frame or an ATM packet format received from the 1X network system into a handoff message of an IP packet format and transfers it to the ALL IP network system through an Ethernet interface, converts a handoff message in the IP packet format received from the ALL IP network into a handoff message in E1 HDLC frame or the ATM packet format and transfers it to the 1X network system.

Description

System and method for voice call soft handoff between all IP network and existing mobile communication network {System and method for voice call soft hand-off between ALL IP mobile network and legacy mobile network}

1 is a view schematically showing an example of a handoff implementation procedure between a conventional all IP mobile communication network and an existing mobile communication network;

2 is a diagram schematically illustrating a system configuration for soft handoff between an ALL IP mobile communication network and an existing mobile communication network (1X network) according to a preferred embodiment of the present invention;

3 is a diagram illustrating a message flow for voice call handoff from a 1X network to an ALL IP mobile communication network in a soft handoff method according to an embodiment of the present invention;

4 (a) to 4 (d) are tables for explaining the conversion of a signaling message by the handoff matching device in the message flow of FIG. 3;

5 (a) to 5 (f) are tables for explaining the conversion of traffic messages by the handoff matching device in the message flow of FIG. 3;

6 is a diagram illustrating a message flow for voice call handoff from an ALL IP mobile communication network to a 1X network as an existing mobile communication network in the preferred embodiment of the present invention.

7 (a) to 7 (d) are tables for explaining conversion of signal messages by the handoff matching device in the message flow of FIG. 6;

8 (a) to 8 (f) are tables for explaining the conversion of traffic messages by the handoff matching device in the message flow of FIG.

The present invention relates to a handoff in a mobile communication network, and more particularly, to a system and method for soft handoff for voice calls between an ALL IP network and an existing network in a mobile communication network consisting of an ALL IP network and an existing network. will be.

The mobile communication system is largely classified into a mobile station, a base station, and a mobile switching station. The base station is a base transceiver station (hereinafter, abbreviated as 'BTS') for performing a wireless communication connection between mobile stations, and a base station controller for controlling call mobility related to call processing by controlling a plurality of BTSs. Station Controller; hereafter abbreviated as 'BSC'. The switching center includes a Mobile Switching Center (hereinafter referred to as MSC) for switching transmission and reception paths of call and control signals.

Such a mobile communication system is a CDMA2000 1X EV-DO standard that supports only high-speed data, following a 2nd generation (2G) system based on IS-95 standard or the like mainly for transmitting and receiving voice signals in a code division multiple access (CDMA) method. Generation 3 (2.5G) systems and 3G (3G) systems based on CDMA2000 1X EV-DV standard, which is a technology standard that supports both high-speed data and voice signals and is optimized for real-time data service and high-speed data service, are being distributed. In addition, IMT-2000, a wired / wireless integrated third generation (3G) communication service that provides global roaming and multimedia services such as voice, high-speed data and video in terrestrial and satellite environments, is being discussed, and some systems are spreading. In addition, as a next-generation (4G) network, the ALL IP network, which is currently undergoing standard work, is also widely distributed.

As described above, in the mobile communication network system in which the ALL IP network is locally distributed, the existing network system and the ALL IP network system have different back-bones, and thus, handoffs cannot be implemented between them using existing routers.

Accordingly, as shown in FIG. 1, a method of implementing a handoff between a 1X based 1X network and an ALL IP network as an existing mobile communication network has been proposed as an exchange period hard handoff method defined in the IS41-C standard.

That is, when the mobile station 1 performs a call on the 1X network and a handoff situation occurs to the ALL IP network, a PSMM (Pilot Strength Measurement Message) is transmitted from the mobile station 1 to the 1X network control station 3 (BTS / BSC). Is transmitted (step S2). Here, the PSMM includes information of the BTS of the ALL IP network to be handed off by the mobile station 1 and the corresponding NID (Network ID), for example, the ID of the MSC and the cell ID.

The 1X network control station 3 generates a handoff request message and sends it to the 1X network switch 5 (step S4). Here, the handoff request message includes parameters obtained from the PSMM.

The 1X network switch 5 transmits the FacilitiesDirective2 message defined in the IS41-C standard to the ALL IP network switch 7 (step S6). Here, the FacilitiesDirective2 message includes handoff related parameters such as source MSC ID, target MSC ID, target cell ID, and channel condition.

The ALL IP network switch 7 generates and transmits a handoff request message to the target IP base station 9 (step S8). Here, the handoff request message includes most of the parameters obtained in the FacilitiesDirective2 message.

The IP base station 9 generates and transmits a response message for the handoff request to the ALL IP network switch 7 after the radio resources are allocated (step S10). The 1X network exchange 7 generates a FacilitiesDirective2 message defined in the IS41-C standard including the parameters obtained from the response message and transmits it to the 1X network exchange 5 (step S12).

The 1X network exchanger 5 generates a handoff command and sends it to the 1X network control station 3 to start the handoff procedure.

The 1X network control station 3 generates a handoff start message indicating that handoff is in progress and sends it to the 1X network exchange 5 (step S16). In addition, the 1X network control station 3 generates a Universal Hand-off Direction Message (UHDM) and transmits it to the mobile station 1 (step S18).

The mobile station 1 generates a hand-off complete message (HCM) and transmits it to the target IP base station 9 (step S20). Accordingly, the IP base station 9 generates a handoff completion message and transmits it to the ALL IP network switch 7 (step S22), and the ALL IP network switch 7 displays the MSONCH () indicating that the handoff was successful. Mobile Station On CHannel) message is transmitted to the 1X network switch 5 (step S24).

The 1X network switch 5 generates a release command message for releasing resources between the mobile station 1, the 1X network control station 3, and the 1X network switch 5, thereby generating a 1X network control station 3 (Step S26), the 1X network control station 3 generates a release message and transmits it to the mobile station 1 (step S28), and also generates a release completion message and transmits it to the 1X network switch 5 ( Step S30).

However, in the conventional handoff method, since the hard handoff is performed by exchanging FacilitiesDirectives2 messages between the 1X network switch 5 and the ALL IP network switch 7, the handoff success rate is very low, which is less than about 50%. Has a problem.

Therefore, there is a demand for the development of a method that can significantly improve the handoff success rate by implementing a soft handoff rather than a hard handoff between the existing network system and the ALL IP network system.

Accordingly, the present invention has been made to meet the above-described demands of the related art. In the mobile communication network, the ALL IP mobile communication network and the existing IP system enable continuous handoff without disconnection of voice calls between the existing network system and the ALL IP network system. It is an object of the present invention to provide a voice call soft handoff system and method between mobile communication networks.

In order to achieve the above object, the voice call soft handoff system between an ALL IP mobile communication network and an existing mobile communication network according to the present invention includes: an ALL IP network in which a plurality of IP base stations (IP BS) are connected through an Ethernet interface, and 1X. In a mobile communication network system combined with a 1x network based on a mobile station, a mobile station is connected to a base station of an all IP network and a base station of a 1x network during a voice call between either a base station of an all IP network or a base station of an 1x network. When the voice call handoff situation occurs, at least one handoff matching device for converting and forwarding the handoff message transmitted between the ALL IP network system and the 1X network system.

Here, the handoff matching device converts an E1 HDLC frame or ATM packet handoff message from a 1X network system into a handoff message in the form of an IP packet and transmits it to an ALL IP network system through an Ethernet interface. It converts the handoff message in the form of an IP packet from the network into a handoff message in the form of an E1 HDLC frame or an ATM packet and delivers it to the 1X network system.

The handoff matching device stores the identification information and the IP address of the IP base station equipment of the ALL IP network and utilizes the handoff message when converting the 1X network system to the ALL IP network system, and the 1X network system and the ALL IP network system. When converting the handoff message between the temporary information stored in the information contained in the corresponding handoff message to be used for the later handoff message conversion along with the index information, and stored according to the address system of the ALL IP network and the address system of the 1X network Handoff between 1X network system and ALL IP network system by address translation mapping algorithm using identification information and IP address of IP base station equipment, the temporarily stored index information and information to be used for later handoff message conversion. Perform message header translation for the message.

The index information may be generated using specific field information of a handoff message to be converted, or the index may be a value generated sequentially or randomly by the handoff matching device.

In addition, the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network for achieving the above object, the 1 IP-based ALL IP network with a plurality of IP base stations (IP BS) is connected through an Ethernet interface, In a mobile communication network system in which a 1X network is combined, a mobile station makes a voice call to a base station of an ALL IP network and a base station of an 1X network during a voice call between one of the base stations of the ALL IP network and the base station of the 1X network. When a handoff situation occurs, the handoff message transmitted between the ALL IP network system and the 1X network system may be converted and transmitted according to the address system of the ALL IP network and the address system of the 1X network.

Herein, the handoff message from the 1X network system is an E1 HDLC frame or ATM packet, and the handoff message of the ALL IP network system is an IP packet, and the handoff message from the 1X network system is an E1 HDLC frame or ATM packet. It is converted into a handoff message in the form of an IP packet and transmitted to the ALL IP network system side, and a handoff message in the form of an IP packet from the ALL IP network is converted into a handoff message in the form of an E1 HDLC frame or an ATM packet and transmitted to a 1X network system. do.

When the handoff message is converted, the identification information and IP address of the previously stored IP base station equipment are used, and when the handoff message is converted between the 1X network system and the ALL IP network system, the hand is later included in the handoff message. Temporarily store the information to be used for off-message conversion with an index; The message header conversion for the handoff message between the 1X network system and the ALL IP network system is performed by an address translation mapping algorithm using the stored identification information and IP address of the stored IP base station equipment and the temporarily stored index and information. do.

In the voice call soft handoff method between an ALL IP mobile communication network and an existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to an ALL IP network while a mobile station performs a call through a 1X network, Parsing a handoff request message (HO_REQ) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Acquiring previously stored IP addresses for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the handoff request message (HO_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff request message (HO_REQ) in association with index information; By using the IP address of the acquired IP base station equipment, the information of the parsed handoff request message (HO_REQ) and the index information, a handoff request message (HO REQ) in the form of an IP packet corresponding to the address system of the ALL IP network. It is configured to include the step of transmitting to the ALL IP network system.

In the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing a handoff response message (HO RP) in the form of an IP packet received from the ALL IP network system; Extracting index information included in information of the parsed handoff response message (HO RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff response message (HO RP) in association with the index information; A handoff response message (HO_RP in the form of an E1 HDLC frame or ATM packet) corresponding to an address system of a 1X network using information acquired in association with the index information and information of the parsed handoff response message (HO RP). It is configured to further include the step of transmitting to the 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing a configuration information request message (CFG_REQ) in the form of an E1 HDLC frame or ATM packet received from a 1X network system for requesting IP base station configuration information for a current pilot; Acquiring previously stored IP addresses for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the configuration information request message CFG_REQ; Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information request message (CFG_REQ) in association with index information; CFG configuration information request message (CFG) corresponding to the address system of the ALL IP network, using the IP address of the acquired IP base station equipment, the information of the parsed configuration information request message (CFG_REQ), and the index information. Converting to REQ) and transmitting to the ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing a configuration information response message (CFG RP) received in the form of an IP packet received from the ALL IP network system; Extracting index information included in information of the parsed configuration information response message (CFG RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information response message (CFG RP) in association with the index information; A configuration information response message (CFG_RP) in the form of an E1 HDLC frame or ATM packet corresponding to an address system of a 1X network using information obtained in association with the index information and information of the parsed configuration information response message (CFG RP). It is configured to further include the step of transmitting to the 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing the forward time synchronization message (Fwd_Time Sync) in the form of an E1 HDLC frame or ATM packet received from the 1X network system; Acquiring previously stored traffic channel IP addresses and traffic channel identification information for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the forward time synchronization message (Fwd_Time Sync); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward time synchronization message (Fwd_Time Sync) in association with index information; IP packet type corresponding to the address system of the ALL IP network by using the acquired traffic channel IP address and traffic channel identification information of the IP base station equipment, the index information, and the information of the parsed forward time synchronization message (Fwd_Time Sync). It is further configured to convert the forward time synchronization (Fwd Time Sync) of the transmission to the ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing a reverse time synchronization message (Rvs Time Sync) in the form of an IP packet received from the ALL IP network system; Extracting index information included in the parsed Rvs Time Sync information and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse time synchronization message (Rvs Time Sync) in association with the index information; By using information acquired in association with the index information and information of the parsed Rvs Time Sync, a backward time synchronous message in the form of an E1 HDLC frame or an ATM packet corresponding to an address system of a 1X network ( Rvs_Time Sync) to transmit to the 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing the forward traffic message (Fwd_Traffic) in the form of an E1 HDLC frame or ATM packet received from the 1X network system; Acquiring traffic channel IP address and traffic channel identification information of the corresponding IP base station equipment by using the identification information of the IP base station equipment to be handed off included in the forward traffic message (Fwd_Traffic); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward traffic message (Fwd_Traffic) in association with index information; By using the acquired IP address and traffic channel identification information of the IP base station equipment, the index information, and the information of the parsed forward traffic message Fwd_Traffic, the IP packet is forwarded in the form of an IP packet corresponding to the address system of the ALL IP network. Converting to a traffic message (Fwd Traffic) is configured to further include transmitting to the ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing a reverse traffic message (Rvs Traffic) in the form of an IP packet received from the ALL IP network system; Extracting index information included in information of the parsed reverse traffic message (Rvs Traffic) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse traffic message (Rvs Traffic) in association with the index information; By using the information acquired in association with the index information and the information of the parsed RTS Traffic, a RTS_Traffic in the form of an E1 HDLC frame or an ATM packet corresponding to an address system of a 1X network is used. And converting the data to a 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing the neighbor configuration information request message (NBR_REQ) in the form of an E1 HDLC frame or ATM packet received from a 1X network system for requesting configuration of the neighbor base station for the current pilot; Acquiring previously stored IP addresses for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the peripheral configuration information request message (NBR_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR_REQ) in association with index information; Peripheral configuration information request message in the form of an IP packet corresponding to an address system of an ALL IP network by using the obtained IP address of the IP base station equipment, information of the parsed peripheral configuration information request message (NBR_REQ), and the index information. NBR REQ) is further configured to include the step of transmitting to the ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the ALL IP network while the mobile station performs a call through the 1X network. Parsing the peripheral configuration information request message (NBR RP) in the form of IP packets received from the ALL IP network system; Extracting index information included in information of the parsed peripheral configuration information request message (NBR RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR RP) in association with the index information; Peripheral configuration information request message in the form of an E1 HDLC frame or ATM packet corresponding to an address system of a 1X network using information acquired in association with the index information and information of the parsed peripheral configuration information request message (NBR RP). Converting to (NBR_RP) and transmitting to the 1X network system.

On the other hand, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a mobile station performs a handoff situation to the 1X network while performing a call through the ALL IP network. Parsing the handoff request message HO_REQ in the form of an IP packet received from the ALL IP system; Acquiring identification information of the 1X network base station equipment to be handed off using information included in the handoff request message (HO_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff request message (HO_REQ) in association with index information; A handoff request in the form of an E1 HDLC frame or ATM packet corresponding to the address system of the 1X network using the acquired identification information of the 1X network base station equipment, the information of the parsed handoff request message (HO_REQ), and the index information. And converting the message (HO REQ) into a 1X network system.

In the voice call soft handoff method between an ALL IP mobile communication network and an existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to a 1X network while a mobile station performs a call through an ALL IP network. Parsing a handoff response message (HO RP) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Extracting index information included in the parsed handoff response message (HO RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff response message (HO RP) in association with the index information; By using the information acquired in association with the index information and the information of the parsed handoff response message (HO RP), it is converted into a handoff response message (HO_RP) in the form of an IP packet corresponding to the address system of the ALL IP network. It further comprises the step of transmitting to the ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing a configuration information request message (CFG_REQ) in the form of an IP packet received from an ALL IP network system for requesting configuration information of the 1X network base station for the current pilot; Acquiring identification information of the corresponding 1X network base station equipment to be handed off using index information included in the configuration information request message (CFG_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information request message (CFG_REQ) in association with index information; Configuration information request in the form of an E1 HDLC frame or ATM packet corresponding to the address system of the 1X network using the obtained identification information of the 1X network base station equipment, the information of the parsed configuration information request message (CFG_REQ), and the index information. And converting the message into a CFG REQ and transmitting it to the 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing the configuration information response message (CFG RP) in the form of an E1 HDLC frame or ATM packet received from the 1X network system; Extracting index information included in information of the parsed configuration information response message (CFG RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information response message (CFG RP) in association with the index information; Using the information acquired in association with the index information and the information of the parsed configuration information response message (CFG RP), it is converted into a configuration information response message (CFG_RP) in the form of an IP packet corresponding to the address system of the ALL IP network. It further comprises the step of transmitting to the ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing a forward time synchronization message (Fwd_Time Sync) in the form of an IP packet received from the ALL IP network system; Acquiring previously stored traffic channel addresses and traffic channel identification information of the 1X network base station equipment to be handed off using index information included in the forward time synchronization message (Fwd_Time Sync); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward time synchronization message (Fwd_Time Sync) in association with index information; E1 HDLC corresponding to an address system of 1X network by using the acquired traffic channel address and traffic channel identification information of the 1X network base station equipment, the index information, and the information of the parsed forward time synchronization message (Fwd_Time Sync). The method further includes converting a forward time synchronization message in the form of a frame or an ATM packet and transmitting the same to a 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing a reverse time synchronization message (Rvs Time Sync) in the form of an E1 HDLC frame or ATM packet received from the 1X network system; Extracting index information included in the parsed Rvs Time Sync information and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse time synchronization message (Rvs Time Sync) in association with the index information; By using information obtained in association with the index information and information of the parsed Rvs Time Sync, a RTS_Time Sync message in the form of an IP packet corresponding to an address system of an ALL IP network is used. And converting the data into an ALL IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing a forward traffic message (Fwd_Traffic) in the form of an IP packet received from the ALL IP network system; Acquiring previously stored traffic channel addresses and traffic channel identification information of the corresponding 1X network base station equipment by using index information included in the forward traffic message (Fwd_Traffic); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward traffic message (Fwd_Traffic) in association with index information; E1 HDLC frame or ATM packet corresponding to the address system of 1X network using the obtained traffic channel address, traffic channel identification information of the 1X network base station equipment, the index information, and the parsed forward traffic message (Fwd_Traffic) information. And converting the data into a forward traffic message in the form of a forward traffic message to a 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing the reverse traffic message (Rvs Traffic) in the form of an E1 HDLC frame or ATM packet received from the 1X network system; Extracting index information included in information of the parsed reverse traffic message (Rvs Traffic) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse traffic message (Rvs Traffic) in association with the index information; Using the information obtained in association with the index information and the parsed RTS Traffic information, the IP packet is converted into a RTP_Traffic in the form of an IP packet corresponding to the address system of the ALL IP network. It further comprises the step of transmitting to the IP network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing the neighbor configuration information request message (NBR_REQ) in the form of an IP packet received from an ALL IP network system for requesting configuration information of the neighboring base station of the 1X network for the current pilot; Acquiring identification information of the 1X network base station equipment to be handed off using index information included in the peripheral configuration information request message (NBR_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR_REQ) in association with index information; Peripheral configuration information in the form of an E1 HDLC frame or ATM packet corresponding to an address system of the 1X network using the obtained identification information of the 1X network base station equipment and the index information of the parsed peripheral configuration information request message (NBR_REQ). And converting the request message (NBR REQ) to the 1X network system.

In addition, in the voice call soft handoff method between the ALL IP mobile communication network and the existing mobile communication network according to the present invention, a message conversion process when a handoff situation occurs to the 1X network while the mobile station performs a call through the ALL IP network. Parsing the peripheral configuration information request message (NBR RP) in the form of an E1 HDLC frame or ATM packet received from the 1X network system; Extracting index information included in information of the parsed peripheral configuration information request message (NBR RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR RP) in association with the index information; Peripheral configuration information request message (NBR_RP) in the form of an IP packet corresponding to an address system of an ALL IP network by using the information acquired in association with the index information and the parsed peripheral configuration information request message (NBR RP). And converting the data into an ALL IP network system.

According to the present invention configured as described above, it is possible to gradually evolve the mobile communication network from the existing network to the ALL IP network by enabling continuous handoff without disconnecting the voice call between the existing network system and the ALL IP network system in the mobile communication network. It becomes possible. Accordingly, the present invention enables soft handoff between the ALL IP network and the existing network, and thus, from an operator's point of view, it is easy to construct a phased network without disrupting existing services when evolving from the existing network to the ALL IP network in the future. It can be secured.

Hereinafter, a voice call soft handoff system and method between an ALL IP mobile communication network and an existing mobile communication network according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following specification, a detailed description of well-known components (network configuration equipment) will be omitted, and the contents disclosed in the publicly known standards and known technologies will be described for signal messages and traffic messages for handoff. Will be omitted.

2 is a diagram schematically illustrating a system configuration for soft handoff between an ALL IP mobile communication network and a 1X based 1X network as an existing mobile communication network according to a preferred embodiment of the present invention.

As shown in the figure, the ALL IP network includes a plurality of IP Base Stations (IP BSs) 20, MGs (Media Servers) 80, and SGs for wireless communication connection with the mobile station 10. (Signaling Gateway) 90, CA (Call Agent) 100, and the like are configured to be communicatively connected through a router based on IP (Internet Protocol). Here, the ALL IP network transmits voice, data, and control signals based on IP packets. The IP base station 20 is a combination of an IP-based base station transmitter (IP BTS) and an IP-based base station controller (IP BSC), which may be configured separately from each other according to the network design.

In addition, as a conventional network, the 1X network includes a base station transmission system (BTS) 70 for performing a wireless communication connection between mobile stations, a base station controller (BSC) for controlling a plurality of BTSs and performing call mobility control related to call processing ( 60), MSC (Mobile Switching Center) 50 for switching the transmission and reception paths of call and control signals, Signal Transfer Point (Signal Transfer Point) for converting messages of No. 7 network and messages of ALL IP network as a signal network STP (90), Interconnection Gateway Switch (IGS) 130 for communication connection with PSTN, Inter-Working Function (IWF) 140 for communication connection with packet networks such as the Internet, Central CDMA Inter Networking Unit (150), Packet Control Function (PCF) 160, Packet Data Service Node (PDSN) 170, AAA (Authentication, Authorization, Accounting) (180).

In addition, in the soft handoff system according to the present invention, the 1X network switch (MSC) 50 performs the data communication using the E1 HDLC (High-level Data Link Controller) protocol through the E1 dedicated line and the ALL IP network It is configured to include a handoff matching device 40 for performing a soft communication between the 1X network and the ALL IP network by performing data communication using the IP protocol over Ethernet.

The handoff matching device 40 according to the present invention converts the handoff-related HDLC message of the 1X system into an IP message-based IP base station message and transmits the IP base station message to the IP base station through the Ethernet interface. It converts the handoff processing message transmitted in the packet form into the HDLC message in the form of an E1 HDLC frame and delivers it to the BSC of the 1X network. This equipment enables soft handoff between two systems of different types.

The handoff matching device 40 according to the present invention is a method for establishing a logical address system to implement a high success rate of soft handoff to enable continuous service without disconnection of voice even between ALL IP networks and 1X networks having different manufacturers or manufacturing methods. In addition, the communication protocol application method and the soft handoff execution method using the same are newly defined and implemented.

As described above, in order to implement soft handoff between ALL IP network and 1X network, there must be a physical device capable of exchanging frames between systems with different manufacturers or manufacturing methods. To this end, the handoff matching device 40 according to the present invention is equipped with a fast Ethernet to E1 (Fast Ethernet to E1) matching module. In addition, the handoff matching device 40 according to the present invention performs a control and traffic message conversion function to perform a soft handoff between the IP base station and the 1X system, and basically for soft handoff of voice calls and data calls under traffic conditions. Process the relevant call.

In addition, the handoff matching device 40 according to the present invention is designed to be able to interwork with the IP base station without changing the software or hardware of the existing 1X system, and designed to operate like the BSC of one 1X system. Therefore, the handoff matching device and the IP base station can accommodate the handoff processing algorithm of the 1X system.

 In addition, the handoff matching device 40 according to the present invention is designed to support soft handoff through a plurality of existing networks and IP base stations. That is, one handoff matching device performs a role of a network board by generating and managing an address translation table between an IP base station and a 1X network by itself, thereby performing soft handoff between a plurality of IP base stations and a plurality of existing networks. have. To this end, between the IP base station connected to the handoff matching device 40 and the 1X system, message header conversion may be performed such that IP conversion is performed mutually according to the address system of BSC / BTS.

In addition, the handoff matching device 40 according to the present invention has defined an address translation mapping algorithm so that it can send and receive signaling messages and traffic messages between 1X networks and IP base stations.

To this end, one handoff matching device performs the role of a network board by generating and managing an address translation table between an IP base station and an existing network of 1X network itself, thereby performing a soft handoff between a plurality of IP base stations and a plurality of 1X networks. have. According to the address management scheme of the 1X network, the handoff matching device uses the network ID (NID) of the network matched with the 1X network to allocate the address system of the control station and the base station, and the base station ID of the control station of the IP base station. You must have the channel card's IP address. In addition, the handoff matching device generates a table management module called a task ID to manage the address translation table between the IP base station and the IX network.

Next, the voice call handoff method from the 1X network to the ALL IP network in the soft handoff method according to the preferred embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5.

3 is a diagram illustrating a message flow for voice call handoff from a 1X network to an ALL IP network in a soft handoff method according to an exemplary embodiment of the present invention. In the figure, the BTS 70 of the 1X network is divided into a base station processor 72 and a channel card 72, and the BSC 60 of the 1X network is controlled with a selector 62 which performs call selection, vocoding, and the like. It is divided into the station processor 64. In addition, the IP base station (IP BS) 20 includes an IP BSC 22 including a control station processor 22C and a selector 22C, and an IP BTS (including a channel card 24C and a base station processor 24B). 24).

4 (a) to 4 (d) are tables for explaining conversion of a signaling signal message by the handoff matching device in the message flow of FIG. 3, and FIGS. 5 (a) to 5 (f). Is a table for explaining the conversion of the traffic message by the handoff matching device in the message flow of FIG.

As shown in FIG. 2, the mobile station 10 enters the coverage of the IP base station 20 of the ALL IP network (see arrow A in the figure) while performing a voice call over the 1X network. The case where a soft handoff is made will be described.

First, when the mobile station 10 performs a call in the 1X network and a handoff situation occurs to the ALL IP network, the mobile station 10 generates a Pilot Strength Measurement Message (PSMM) in the mobile station 10 to selector of the BSC 60 in the 1X network. Transferring to control station processor 64 is carried out via 62 (steps S31 and S32). Here, the PSMM includes information of the IP BTS 24 of the ALL IP network to which the mobile station 10 will be handed off (including the ID of the base station processor 24B as the PN information of the base station).

The control station processor 64 of the BSC 60 generates a handoff request message HO_REQ and transmits it to the handoff matching device 40 (step S35). Here, the handoff request message (HO_REQ) is configured to include the parameters obtained from the PSMM, the main field is the target ID (Dest_ID) [herein the base station processor 24B of the ALL IP network as shown in Figure 4 (a) ) ID, source ID (Src_ID) (here ID of 1x network control station processor 64), target task ID (Dest_TaskID), source task ID (Src_TaskID), signal ID (Sig_ID) (i.e. ID indicating handoff request message signal, message ID (Msg_ID) (i.e. ID indicating that this message is a handoff request message), call ID (Call_ID) (call task ID), forward RC (for_rc) (Foreword Radio Configuration) Preference) and reverse RC (rev_rc).

The handoff matching device 40 parses a handoff request message (HO_REQ) in the form of an E1 HDLC frame transmitted from the control station processor 64 and forms an IP packet corresponding to an address system of an ALL IP network. Is converted into a handoff request message (HO REQ) and transmitted to the control station processor 22C of the IP BSC 22 constituting the IP base station 20 (step S37).

Here, the handoff request message (HO REQ) comprises parameters obtained from the handoff request message (HO_REQ), the main field of which is the target IP address (Dest-IP-) as shown in Fig. 4 (a). Addr) [herein, IP address of the control station processor 22C of the ALL IP network], source IP address (Src-IP-Addr) [here, IP address of the handoff matching device 40], and target ID (Dest_ID) [ALL The task ID of the base station processor 24B of the IP network, which is an initial value " 000000 " generated by the handoff matching device 40, and the source ID Src_ID (here, a handoff request message as a serving task ID). Is the same as the source task ID (Src_TaskID) of (HO_REQ) and is the task ID of the handoff matching device assigned by the handoff matching device 40], the target task ID (Dest_TaskID), the target task ID (Dest_TaskID), and the source task ID. (Src_TaskID), signal ID (Sig_ID) (i.e., this signal is a handoff request message signal) ID indicating), message ID (Msg_ID) (ie, ID indicating that this message is a handoff request message), and call ID (Call_ID) (call task ID).

The handoff matching device 40 is basically an ID (Base_id) for the base station processor 24B of the IP BTS 24 constituting all the IP base station (IP BS) 20 that is in charge of the ALL IP network; The IP address (CCP_IP_Addr) of the IP BSC 22 is stored and managed in a table form, for example, and its own IP address and ID are also stored.

The handoff matching device 40, in the process of converting the handoff request message (HO REQ), as shown in Figure 4 (a), the target ID included in the handoff request message (HO_REQ) from the 1X network ( The target of the handoff request message (HO REQ) to search for the ID (Base_id) of the base station processor 24B of the IP BTS 24, which is the same as the Dest_ID, read the corresponding IP address (CCP_IP_Addr), and transmit it to the ALL IP network. Insert it in the IP address (Dest-IP-Addr) field, and insert your own IP address in the source IP address (Src-IP-Addr) field. Also, the target ID (Dest_ID) included in the handoff request message (HO_REQ) is inserted into the target ID (Dest_ID) field, and the task ID (operation) of the control station processor 64 of the 1X network BSC is inserted into the source ID (Src_ID) field. In the drawing, Src_TaskID] is inserted, and the signal ID and message corresponding to the signal ID (Sig_ID) and message ID (Msg_ID) included in the handoff request message (HO_REQ) are respectively included in the signal ID (Sig_ID) and message ID (Msg_ID) fields. The ID is inserted, and the call ID (Call_ID) field is inserted by combining the target MSC ID [NID (Network ID)] and the Call ID (Call Task ID) included in the header of the handoff request message (HO_REQ). In this manner, the handoff matching device 40 converts and generates a handoff request message HO REQ.

Meanwhile, the handoff matching device 40 generates a subsequent message by generating a source ID (Src_ID), a source task ID (Src_TaskID), a forward RC (for_rc), and a reverse RC (rev_rc) included in the handoff request message HO_REQ. The source task ID (Src_TaskID) is used as an index when generating a subsequent message. All data temporarily stored in the handoff matching device 40 referred to herein are deleted when the call ends.

Then, the control station processor 22C of the IP BSC 22 transmits a handoff request message (HO Request) to the base station processor 24B of the IP BTS 24 (step S39). Here, the handoff request message (HO Request) follows most of the parameters of the handoff request message (HO REQ) from the handoff matching device 40.

Subsequently, the base station processor 24B of the IP BTS 24 transmits a traffic channel assignment request message (TC Assign) to the channel card 24C, and receives a channel assignment confirmation message (TC Assign Ack) from the channel card 24C. As a result, a procedure for assigning a traffic channel is performed (steps S41 and S43).

Thereafter, the base station processor 24B of the IP BTS 24 generates a handoff response message (HO Response) and transmits it to the control station processor 22C of the IP BSC 22 (step S45). Here, the handoff response message (HO Response) includes the assigned traffic channel ID (Tc_ID), the IP address (Tc_Addr) of the traffic channel and the code channel allocated radio resource information (Code_ch).

As a result, the control station processor 22C generates a handoff response message HO RP and transmits it to the handoff matching device 40 (step S47). Here, the handoff response message (HO RP) is shown in Figure 4 (b), the target IP address (Dest-IP-Addr) (here IP address of the handoff matching device 40), source IP address (Src-IP-Addr) [here, task ID of the handoff matching device 40], target ID (Dest-ID) [here, source task ID (Src_TaskID) of the handoff request message HO_REQ (i.e., control of the BSC). Same as the task ID of the station processor)], the source ID (Src-ID) (here, the task ID of the control station processor 22C of the IP BSC 22), the signal ID (Sig_ID), the message ID (Msg_ID), and the call. ID (Call_ID), traffic channel ID (Tc_ID) [traffic channel ID assigned from the channel card 24C], traffic channel address Tc_Addr [traffic channel IP address assigned from the channel card 24C], code channel Assigned radio resource information Code_ch (radio resource information allocated to the code channel from the channel card 24C).

The handoff matching device 40 parses a handoff response message (HO RP) in the form of an IP packet transmitted from the control station processor 22C of the IP BSC 22, and responds to an HDLC frame in response to a 1X network address system. The data is converted into a handoff assignment message HO_Assign and sent to the control station processor 64 constituting the BSC 60 (step S49).

Here, the handoff assignment message HO_Assign includes parameters obtained from the handoff response message HO RP, the main field of which is a target ID (Dest_ID) [herein, 1X) as shown in FIG. ID of the control station processor 64 of the network], source ID (Src_ID) (here, ID of the handoff matching device 40), target task ID (Dest_TaskID) [herein, task ID of the control station processor 64 of the 1X network). ], The source task ID (Src_TaskID) (here, the task ID of the base station processor of the ALL IP network, which is the initial value "000000" generated by the handoff matching device 40), and the signal ID (Sig_ID) (that is, the present signal). Is an ID indicating that the message is a handoff assignment message, a message ID (Msg_ID) (that is, an ID indicating that this message is a handoff assignment message), a call ID (Call_ID), a traffic channel ID (Tc_ID) (the channel card 24C). Traffic channel ID allocated from the network channel), and the traffic channel address Tc_Addr (from the channel card 24C). Traffic channel IP address obtained per], the code channel allocation including the radio resource information (Code_ch) [radio resource information allocated code channel from the channel card (24C)].

The handoff matching device 40 converts the handoff assignment message HO_Assign to a target ID Dest_ID included in the handoff response message HO_RP from the ALL network, as shown in FIG. The task ID of the control station processor 64 of the 1X network BSC equal to [the same as the source task ID Src_TaskID of the handoff request message HO_REQ (ie, the task ID of the control station processor of the BSC)] Src_TaskID_L], and inserts the corresponding temporarily stored source ID (Src_ID_L in the figure) into the target ID (Dest_ID) field of the handoff allocation message HO_Assign to be transmitted to the 1X network, Insert a task ID (Src_TaskID_L in the figure) into the target task ID (Dest_TaskID) field. In addition, its ID is inserted into the source ID (Src_ID) field, and the signal ID (Sig_ID) and the message ID (Sig_ID) included in the handoff response message (HO RP) are respectively included in the signal ID (Sig_ID) and message ID (Msg_ID) fields. Msg_ID), the signal ID and the message ID are inserted. In addition, the call ID (Call_ID) field, the traffic channel ID (Tc_ID) field, the traffic channel address (Tc_Addr), and the code channel allocation radio resource information (Code_ch) are respectively called call task IDs of the handoff response message (HO RP). A traffic channel ID (Tc_ID), a traffic channel address (Tc_Addr) and a code channel assignment radio resource information (Code_ch) are inserted.

Meanwhile, the handoff matching device 40 generates a subsequent message by generating a source ID (Src_ID), a traffic channel address (Tc_Addr), and a code channel allocation radio resource information (Code_ch) included in the handoff response message (HO RP). Save it temporarily.

The control station processor 64 of the 1X network receiving the handoff assignment message HO_Assign is added to the control station processor 22C of the target BSC to ensure call quality by handoff of the mobile station 10 in a call. A configuration information request message CFG_REQ, which is a message for requesting configuration information of the BTS 24, is generated and transmitted to the handoff matching device 40 (step S51).

Here, the main fields of the configuration information request message CFG_REQ are the target ID (Dest_ID) (here, the ID of the control station processor 22C of the ALL IP network) and the source ID (Src_ID) as shown in Fig. 4C. [Here, ID of 1x network control station processor 64], target task ID (Dest_TaskID), source task ID (Src_TaskID) [task ID of control station processor 64], signal ID (Sig_ID) (i.e. ID indicating that the signal is a configuration information request message signal, call ID (Call_ID) (call task ID), and target BTS ID (Bts_id) [ID of base station processor 24B of ALL IP network].

The handoff matching device 40 parses the configuration information request message CFG_REQ in the form of an E1 HDLC frame transmitted from the control station processor 64, and configures the configuration information in the form of an IP packet corresponding to the address system of the ALL IP network. A request message (CFG REQ) is converted to the control station processor 22C of the IP BSC 22 constituting the IP base station 20 (step S53).

Here, the configuration information request message (CFG REQ) is configured to include the parameters obtained from the configuration information request message (CFG_REQ), the main field is shown in Figure 4 (c) the target IP address (Dest-IP- Addr) [here, IP address of the control station processor 22C of the ALL IP network], source IP address (Src-IP-Addr) [here, IP address of the handoff matching device 40], target ID (Dest_ID) [here ID of base station processor 24B of ALL IP network], source ID (Src_ID) [herein, ID of base station processor 24B of ALL IP network], signal ID Sig_ID (i.e., this signal is a configuration information request message signal. ID indicating), message ID (Msg_ID) (i.e., ID indicating that this message is a configuration information request message), and call ID (Call_ID) (call task ID).

The handoff matching device 40 converts the configuration information request message CFG REQ, and as shown in FIG. 4C, the target BTS ID included in the configuration information request message CFG_REQ from the 1X network. The ID (base_id) of the base station processor 24B of the IP BTS 24, which is the same as the Bts_id, is searched for, and the corresponding IP address (CCP_IP_Addr) is read and transmitted to the ALL IP network. Insert it in the Target IP Address (Dest-IP-Addr) field, and insert its own IP address in the Source IP Address (Src-IP-Addr) field. Also, the target ID (Dest_ID) included in the configuration information request message (CFG_REQ) is inserted into the target ID (Dest_ID) field, and the ID of the base station processor 24B of the IP BTS 24 is inserted into the source ID (Src_ID) field. Target BTS ID (Bts_id) of the configuration information request message (CFG_REQ)], and the signal ID (Sig_ID) and the signal ID (Sig_ID) included in the configuration information request message (CFG_REQ) in the signal ID (Sig_ID) and message ID (Msg_ID) fields, respectively. Inserts a message ID and a message ID corresponding to the message ID (Msg_ID), and the call ID (Call_ID) field includes the target MSC ID [NID (Network ID)] and the call ID included in the header of the configuration information request message (CFG_REQ). Insert a combination of (Call Task ID). In this manner, the handoff matching device 40 converts and generates a configuration information request message CFG REQ.

Meanwhile, the handoff matching device 40 temporarily stores the source task ID Src_TaskID included in the configuration information request message CFG_REQ for generating a subsequent message.

Then, the control station processor 22C of the IP BSC 22 generates a configuration information response message CFG RP as a response to the configuration information request message CFG REQ and transmits it to the handoff matching device 40 ( Step S55). Here, the configuration information response message (CFG RP) is shown in Figure 4 (d), the target IP address (Dest-IP-Addr) (here IP address of the handoff matching device 40), source IP address (Src-IP-Addr) [herein, the IP address of the control station processor 22C], the target ID (Dest-ID) [here, the serving task ID as a source task ID (Src_TaskID) of the configuration information request message (CFG_REQ). (I.e., the task ID of the control station processor of the BSC), the source ID (Src-ID) (here, the task ID of the control station processor 22C of the IP BSC 22), the signal ID (Sig_ID), Message ID (Msg_ID) and call ID (Call_ID).

The handoff matching device 40 parses a configuration information response message (CFG RP) in the form of an IP packet transmitted from the control station processor 22C of the IP BSC 22, and responds to an HDLC frame in response to a 1X network address system. The control information is converted into a configuration information response message CFG_RP and transmitted to the control station processor 64 constituting the BSC 60 (step S57).

Here, the configuration information response message CFG_RP is configured to include the parameters obtained from the configuration information response message CFG RP, the main field of which is the target ID (Dest_ID) [herein, 1X) as shown in FIG. ID of the control station processor 64 of the network], source ID (Src_ID) (here, ID of the handoff matching device 40), target task ID (Dest_TaskID) [herein, task ID of the control station processor 64 of the 1X network). ], Source task ID (Src_TaskID) (here, task ID of handoff matching device 40), signal ID (Sig_ID) (i.e., ID indicating that this signal is a configuration information response message signal), and call ID (Call_ID). do.

The handoff matching device 40 converts the configuration information response message CFG_RP into a target ID (Dest_ID) included in the configuration information response message CFG_RP from the ALL network as shown in FIG. 4 (d). The task ID of the control station processor 64 of the 1X network BSC equal to [the same as the source task ID Src_TaskID of the handoff request message HO_REQ (ie, the task ID of the control station processor of the BSC)] Src_TaskID_L] and inserts the corresponding temporarily stored source ID (Src_ID_L in the figure) into the target ID (Dest_ID) field of the configuration information response message (CFG_RP) to be transmitted to the 1X network. Insert a task ID (Src_TaskID_L in the figure) into the target task ID (Dest_TaskID) field. In addition, its ID is inserted into the source ID (Src_ID) field, and the signal ID (Sig_ID) and the call ID included in the configuration information response message (CFG RP) are respectively included in the signal ID (Sig_ID) and the message ID (Msg_ID) fields. The corresponding signal ID and call ID are inserted.

Meanwhile, the handoff matching device 40 temporarily stores the source ID Src_ID included in the configuration information response message CFG RP for generating a subsequent message.

Subsequently, the control station processor 64 of the 1X network receiving the configuration information response message CFG_RP transmits a handoff assignment message HO Assgin to the selector 62 which performs a call selection function and a vocoding function. (Step S59).

Subsequently, the 1X network selector 62 which has received the handoff assignment message HO Assgin generates a forward time synchronization message Fwd_Time Sync and transmits it to the handoff matching device 40 (step S61). Here, the forward time synchronization message (Fwd_Time Sync) is a target ID (Dest_ID) (in this case, an address TC_Addr) allocated in the ALL IP network and a signal ID (Sig_ID) as shown in FIG. [In this case, the value generated using the ID of the traffic channel allocated in the ALL IP network], frame control information (frame_ctrl), target BTS ID (base_id) [here, the control station processor (22C) ID of the ALL IP network), Traffic channel ID (tc_id) [ID for traffic channel allocated from ALL IP network], forward frame number (fwd_frame_num) [default value based on packets extracted from 1X system], reverse frame number (rev_frame_num) [1X Default value set based on the packet extracted from the system], service address ID (addr), port / selector number (port_sel).

The handoff matching device 40 parses a forward time synchronization message (Fwd_Time Sync) in the form of an E1 HDLC frame transmitted from the selector 62 of the BSC 60, and matches an IP packet corresponding to an address system of an ALL IP network. It converts into a forward time sync message (Fwd Time Sync) and sends it to the channel card 24C of the IP BTS 24 constituting the IP base station 20 (step S63).

Here, the forward time sync message (Fwd Time Sync) is configured to include the parameters obtained from the forward time sync message (Fwd_Time Sync), the main field of the target IP address (Dest-) as shown in Figure 5 (a) IP-Addr) [herein, IP address of channel card 24C of IP BTS 24 of ALL IP network], Source IP address (Src-IP-Addr) [herein, IP address of handoff matching device 40], The target ID (Dest_ID) [herein, the ID of the traffic channel pre-assigned from the ALL IP network] and the source ID (Src_ID) [herein, a value generated using the ID of the base station processor 24B of the ALL IP network. 40 task ID], frame control information (Frame_ctrl), traffic channel ID (tcid) [ID for traffic channel allocated in ALL IP network], target BSC ID [here, control station processor 22C of ALL IP network] ID].

The handoff matching device 40 is a target included in the forward time synchronization message (Fwd_Time Sync) from the 1X network as shown in FIG. 4 (a) during the conversion to the forward time synchronization message (Fwd Time Sync). ID (Dest_ID) [ie address for traffic channel allocated in ALL IP network (TC_Addr)] and signal ID (Sig_ID) [ie value generated using ID for traffic channel allocated in ALL IP network] Search for ID (Base_id) of base station processor (24B) of IP BTS (24), which is extracted through the server, and read the pre-stored traffic channel IP address (Tc_Addr_H) corresponding to the forward time synchronization message (Fwd) to be transmitted to ALL IP network. Time Sync) is inserted into the target IP address (Dest-IP-Addr) field, and its own IP address is inserted into the source IP address (Src-IP-Addr) field. In addition, a previously stored traffic channel ID (Tc_Id_H) is inserted into the target ID (Dest_ID) field, and a target ID (Dest_ID) and a signal included in the forward time synchronization message (Fwd_Time Sync) are inserted into the source ID (Src_ID) field. Insert the index value (here Ref_id + Base_id) created using ID (Sig_ID). Here, the index value [here Ref_id + Base_id] is for reference in generating subsequent messages. In addition, the frame control information (Frame_ctrl) field is inserted into the frame control information (frame_ctrl) included in the forward time synchronization message (Fwd_Time Sync), and the traffic channel ID (tcid) and the target BSC ID (bscid) field, respectively The traffic channel ID (tc_id) and the target BSC ID (base_id) included in the forward time synchronization message (Fwd_Time Sync) are swapped and inserted. In this manner, the handoff matching device 40 converts and generates a forward time sync message.

Meanwhile, the handoff matching device 40 may include a service address ID (addr), a port / selector number (port_sel), a forward frame number (fwd_frame_num), and a reverse frame number (rev_frame_num) included in the forward time synchronization message (Fwd_Time Sync). ) Is temporarily saved for subsequent message generation.

Thereafter, the channel card 24C of the IP BTS 24 generates a reverse time synchronization message Rvs Time Sync as a response to the forward time sync message and transmits it to the handoff matching device 40. (Step S65). Here, the reverse time synchronization message (Rvs Time Sync) is shown in Fig. 5 (b), the target IP address (Dest-IP-Addr) (here IP address of the handoff matching device 40), source IP Address (Src-IP-Addr) [here IP address of traffic channel], target ID (Dest-ID) [here index value generated by the handoff matching device 40 (Ref_id + Base_id)], frame control information (Frame_ctrl ), Traffic channel ID (tcid) and target BTS ID (btsid).

The handoff matching device 40 parses a reverse time synchronization message (Rvs Time Sync) in the form of an IP packet transmitted from the channel card 24C of the IP BTS 24, and responds to an HDLC frame corresponding to a 1X network address system. The data is converted into a reverse time synchronization message (Rvs_Time Sync) and sent to the selector 62 constituting the BSC 60 (step S67).

Here, the reverse time synchronization message (Rvs_Time Sync) is configured to include the parameters obtained from the reverse time synchronization message (Rvs Time Sync), the main field of which is shown in Figure 5 (b) target ID (Dest_ID) ( Temporarily stored service address ID), Signal ID (Sig_ID) [here created using the temporarily stored port number and selector number], frame control information (frame_ctrl), target BTS ID (base_id), traffic channel ID (tc_id), The forward frame number (fwd_frame_num), the reverse frame number (rev_frame_num), and Walsh channel information (walsh_channel) are included.

The handoff matching device 40 is a target included in the reverse time synchronization message (Rvs Time Sync) from the ALL network as shown in FIG. 5 (b) during the conversion to the reverse time synchronization message (Rvs_Time Sync). Search for ID (Dest_ID) (index value (Ref_id + Base_id) generated by the handoff matching device 40)] and send the temporarily stored service address ID (SVC_addr) corresponding to the 1X network (Rvs_Time Sync) Is inserted into the target ID (Dest_ID) field, and a value generated using the temporarily stored port / selector number (port_sel) is inserted into the signal ID (Sig_ID) field. In addition, frame control information (Frame_ctrl) extracted from the reverse time synchronization message (Rvs Time Sync) is inserted into the frame control information (frame_ctrl) field, and the reverse direction is respectively inserted into the traffic channel ID (tc_id) field and the target BSC ID (base_id) field. The traffic channel ID (tcid) and the target BTS ID (btsid) included in the time synchronization message (Rvs_Time Sync) are swapped and inserted. In the forward frame number (fwd_frame_num) field, reverse frame number (rev_frame_num) field, and Walsh channel information (walsh_channel) field, respectively, the temporarily stored forward frame number (fwd_frame_num), reverse frame number (rev_frame_num), and code channel allocation radio resource information (Code_ch) [radio resource information allocated to a code channel from the channel card 24C; 4 (b)]. In this manner, the handoff matching device 40 converts and generates a reverse time synchronization message (Rvs_Time Sync).

Next, the 1X network selector 62 having received the reverse time synchronization message Rvs_Time Sync generates a forward traffic message Fwd_Traffic and transmits it to the handoff matching device 40 (step S69). Here, the forward traffic message Fwd_Traffic is a target ID (Dest_ID) [herein, an address (TC_Addr) for a traffic channel allocated in an ALL IP network) and a signal ID (Sig_ID) [as shown in FIG. Here, the value generated using the ID of the traffic channel allocated in the ALL IP network], frame control information (frame_ctrl), traffic channel gain information (tc_gain) for forward power control, power control information (Power_control), forward power control Subchannel gain information (pcsc_gain) and the like.

The handoff matching device 40 parses a forward traffic message (Fwd_Traffic) in the form of an E1 HDLC frame transmitted from the selector 62 of the BSC 60, and corresponds to an IP system in the form of an IP packet. The data is converted to a forward traffic message (Fwd Traffic) and transmitted to the channel card 24C of the IP BTS 24 constituting the IP base station 20 (step S71).

In this case, the forward traffic message (Fwd Traffic) includes parameters obtained from the forward traffic message (Fwd_Traffic), the main field of which is the target IP address (Dest-IP-Addr) as shown in FIG. [In this case, the IP address of the channel card 24C of the IP BTS 24 of the ALL IP network], the source IP address (Src-IP-Addr) [herein, the IP address of the handoff matching device 40], and the target ID (Dest_ID). [In this case, the ID of the traffic channel pre-assigned from the ALL IP network] and the source ID (Src_ID) [herein, the value is generated using the ID of the base station processor 24B of the ALL IP network. Task ID], frame control information (Frame_ctrl), forward RC (radioConfig), traffic channel gain information (tcGain), power control information (pwrCtrl), sub-channel gain information (pcscGain) and the like.

The handoff matching device 40 is a target ID (Dest_ID) included in the forward traffic message (Fwd_Traffic) from the 1X network as shown in FIG. 5 (c) during the conversion to the forward traffic message. IP BTS extracted through [ie address (TC_Addr) for allocated traffic channel in ALL IP network] and signal ID (Sig_ID) [ie value generated using ID for traffic channel allocated in ALL IP network] The target IP of the forward traffic message (Fwd Traffic) is searched for the ID (Base_id) of the base station processor (24B) of 24 and the corresponding stored traffic channel IP address (Tc_Addr_H) is transmitted and transmitted to the ALL IP network. Insert it in the Address-Dest-IP-Addr field, and insert your own IP address in the Src-IP-Addr field. Also, a traffic ID (Tc_Id_H) stored in the target ID (Dest_ID) field is inserted, and a target ID (Dest_ID) and a signal ID (Dest_ID) included in the forward traffic message (Fwd_Traffic) are inserted in the source ID (Src_ID) field. Insert the index value (here Ref_id + Base_id) created using Sig_ID). Here, the index value [here Ref_id + Base_id] is for reference in generating subsequent messages. In addition, the frame control information (Frame_ctrl) field is inserted into the frame control information (frame_ctrl) included in the forward traffic message (Fwd_Traffic), the forward RC information (for_rc) previously stored in the forward RC (radioConfig) field (Fig. 4). (a) Reference]. Further, the traffic channel gain information (tc_gain) and power control information included in the forward traffic message Fwd_Traffic are respectively included in the traffic channel gain information (tcGain) field, the power control information (pwrCtrl) field, and the subchannel gain information (pcscGain) field. (power_control) and subchannel gain information (pcsc_gain) are swapped and inserted. In this manner, the handoff matching device 40 converts and generates a forward traffic message (Fwd Traffic).

Thereafter, the channel card 24C of the IP BTS 24 generates a reverse traffic message (Rvs Traffic) as a response to the forward traffic message (Fwd Traffic) and transmits it to the handoff matching device 40 (step S73). . In this case, the reverse traffic message (Rvs Traffic) is a target IP address (Dest-IP-Addr) (here, IP address of the handoff matching device 40) and a source IP address (as shown in FIG. Src-IP-Addr [here IP address of traffic channel], target ID (Dest-ID) [here index value (Ref_id + Base_id) generated by handoff matching device 40], frame control information (Frame_ctrl), Contains quality measurement information.

The handoff matching device 40 parses a reverse traffic message (Rvs Traffic) in the form of an IP packet transmitted from the channel card 24C of the IP BTS 24, and responds to the 1X network address system in the form of an HDLC frame. The reverse traffic message is converted into Rvs_Traffic and transmitted to the selector 62 constituting the BSC 60 (step S75).

Here, the reverse traffic message (Rvs_Traffic) includes parameters obtained from the reverse traffic message (Rvs Traffic), the main field of which is the target ID (Dest_ID) (temporarily stored service address) as shown in FIG. ID), signal ID (Sig_ID) (here, a value generated using the temporarily stored port number and selector number), frame control information (frame_ctrl), and quality measurement information (quality_metric).

In the process of converting the handoff matching device 40 to the reverse traffic message Rvs_Traffic, the target ID Dest_ID included in the reverse traffic message Rvs Traffic from the ALL network as shown in FIG. 5 (d). Search for the index value (Ref_id + Base_id) generated by the handoff matching device 40, and transmit the temporary stored service address ID (SVC_addr) corresponding to the 1X network to the target ID (Dest_ID) of the reverse traffic message (Rvs_Traffic). A value generated by using the temporarily stored port / selector number port_sel is inserted into a field of the signal ID (Sig_ID). The frame control information (frame_ctrl) field is inserted with the frame control information (Frame_ctrl) extracted from the reverse traffic message (Rvs Traffic), and the quality measurement information (Rvs Traffic) extracted from the reverse traffic message (Rvs Traffic) is inserted into the quality_metric field. quality_Metric). In this manner, the handoff matching device 40 converts and generates the reverse traffic message Rvs_Traffic.

On the other hand, the channel card 24C of the IP BTS 24 transmits a reverse traffic message (Rvs Traffic) to the handoff matching device 40, allocates a code channel and power, and sends the result as a message (MOB_ACK). It generates and transmits it to the selector 62 of the BSC 60 via the handoff matching device 40 (steps S77, S79).

Accordingly, the selector 62 of the BSC 60 having received the message MOB_ACK generates a Universal Hand-off Direction Message (UHDM) and transmits it to the mobile station 10 (step S81). Correspondingly, the mobile station 10 generates a hand-off complete message (HCM) and transmits it to the selector 62 of the BSC 60 (step S20).

Thereafter, the selector 62 of the BSC 60 having received the handoff completion message HCM generates a handoff completion message HO_Cml and transmits it to the control station processor 64 of the BSC 60 (step S85). ).

Subsequently, the control station processor 64 receiving the handoff completion message HO_Cml is added to the control station processor 22C of the target BSC to ensure call quality by handoff of the mobile station 10 in a call. The neighbor base station information request message NBR_REQ, which is a message for requesting the neighbor base station information of the BTS 24, is generated and transmitted to the handoff matching device 40 (step S87).

Here, the main fields of the peripheral base station information request message (NBR_REQ) are the target ID (Dest_ID) (here, ID of the control station processor 22C of the ALL IP network) and the source ID (as shown in Fig. 5E). Src_ID) [herein, ID of 1x control station processor 64], target task ID (Dest_TaskID), source task ID (Src_TaskID) [task ID of control station processor 64], signal ID (Sig_ID) (i.e. ID indicating that this signal is a peripheral base station information request message signal, call ID (Call_ID) (call task ID), and target BTS ID (Bts_id) [ID of base station processor 24B of ALL IP network].

The handoff matching device 40 parses a peripheral base station information request message (NBR_REQ) in the form of an E1 HDLC frame transmitted from the control station processor 64, and surrounds an IP packet in response to an address system of an ALL IP network. The information is converted into a base station information request message (NBR REQ) and transmitted to the control station processor 22C of the IP BSC 22 constituting the IP base station 20 (step S89).

Here, the neighboring base station information request message (NBR REQ) includes the parameters obtained from the neighboring base station information request message (NBR_REQ), the main field of which is the target IP address (Dest-) as shown in FIG. IP-Addr) [herein, the IP address of the control station processor 22C of the ALL IP network], the source IP address (Src-IP-Addr) [herein, the IP address of the handoff matching device 40], and the target ID (Dest_ID). [Here, ID of base station processor 24B of ALL IP network], source ID (Src_ID) [here of ID of base station processor 24B of ALL IP network], signal ID (Sig_ID) (i.e., this signal is the peripheral station information request. ID indicating that it is a message signal, message ID (Msg_ID) (i.e., ID indicating that this message is a neighbor base station information request message), and call ID (Call_ID) (call task ID).

The handoff matching device 40 is a target included in the neighbor base station information request message (NBR_REQ) from the 1X network as shown in FIG. 5 (e) during the conversion to the neighbor base station information request message (NBR REQ). Peripheral base station information request message (NBR) to search for the ID (base_id) of the base station processor 24B of the IP BTS 24, which is the same as the BTS ID (Bts_id), to read the corresponding IP address (CCP_IP_Addr), and to transmit it to the ALL IP network. REQ) is inserted into the target IP address (Dest-IP-Addr) field, and its own IP address is inserted into the source IP address (Src-IP-Addr) field. Also, the target ID (Dest_ID) included in the neighboring base station information request message (NBR_REQ) is inserted into the target ID (Dest_ID) field, and the ID of the base station processor 24B of the IP BTS 24 is inserted into the source ID (Src_ID) field. That is, the target BTS ID (Bts_id) of the neighbor base station information request message (NBR_REQ)] is inserted, and the signal ID (Sig_ID) and the message ID (Msg_ID) fields are included in the signal ID (NBR_REQ) included in the neighbor base station information request message (NBR_REQ), respectively. Sig_ID) and the message ID and message ID corresponding to the message ID (Msg_ID) are inserted, and in the Call ID field, the target MSC ID (Network ID) included in the header of the neighbor base station information request message (NBR_REQ). ] And the Call ID are combined. In this manner, the handoff matching device 40 converts and generates a neighbor base station information request message (NBR REQ).

On the other hand, the handoff matching device 40 temporarily stores the source task ID (Src_TaskID) included in the peripheral base station information request message (NBR_REQ) for the generation of subsequent messages.

Thereafter, the control station processor 22C of the IP BSC 22 generates a peripheral base station information response message NBR RP as a response to the peripheral base station information request message NBR REQ, and transmits it to the handoff matching device 40. (Step S91). Here, the peripheral base station information response message (NBR RP), as shown in Figure 5 (f), the target IP address (Dest-IP-Addr) (here IP address of the handoff matching device 40), source IP Address (Src-IP-Addr) [here: IP address of the control station processor 22C], Target ID (Dest-ID) [Here, the source task ID of the neighboring base station information request message (NBR_REQ) as the Serving Task ID. (Src_TaskID) (i.e., the task ID of the control station processor of the BSC), the source ID (Src-ID) (here, the task ID of the control station processor 22C of the IP BSC 22), and the signal ID (Sig_ID). ), A message ID (Msg_ID), and a call ID (Call_ID).

The handoff matching device 40 parses an IP packet type peripheral base station information response message (NBR RP) transmitted from the control station processor 22C of the IP BSC 22, and performs an HDLC corresponding to the 1X network address system. The frame is converted into a peripheral base station information response message NBR_RP and transmitted to the control station processor 64 constituting the BSC 60 (step S93).

Here, the neighbor base station information response message (NBR_RP) includes parameters obtained from the neighbor base station information response message (NBR RP), the main field of which is the target ID (Dest_ID) [as shown in FIG. Herein, the ID of the control station processor 64 of the 1X network, the source ID (Src_ID) (here, the ID of the handoff matching device 40), and the target task ID (Dest_TaskID) (here, of the control station processor 64 of the 1X network). Task ID], source task ID (Src_TaskID) [here, task ID of the handoff matching device 40], signal ID (Sig_ID) (i.e., ID indicating that this signal is a peripheral base station information response message signal), and call ID (Call_ID). ).

The handoff matching device 40 converts the neighbor base station information response message NBR_RP into a target ID (CFG_RP) included in the configuration information response message CFG_RP from the ALL network as shown in FIG. Dest_ID) [the same as the source task ID (Src_TaskID) of the handoff request message (HO_REQ) (ie, the task ID of the control station processor of the BSC)), the task ID of the control station processor 64 of the 1X network BSC In the drawing, Src_TaskID_L] is searched for, and the corresponding temporarily stored source ID (Src_ID_L in the drawing) is inserted into the target ID (Dest_ID) field of the peripheral base station information response message (NBR_RP) to be transmitted to the 1X network, and the control station processor 64 ), The task ID (Src_TaskID_L in the figure) is inserted into the target task ID (Dest_TaskID) field. In addition, its ID is inserted into the source ID (Src_ID) field, and the signal ID (Sig_ID) and the call ID included in the NBR RP in the signal ID (Sig_ID) and the message ID (Msg_ID) fields, respectively. Inserts a signal ID and a call ID corresponding to each other.

On the other hand, the handoff matching device 40 temporarily stores the source ID (Src_ID) included in the peripheral base station information response message (NBR RP) for the generation of subsequent messages.

Subsequently, the control station processor 64 of the 1X network that receives the peripheral base station information response message NBR_RP generates a peripheral base station information update message NbrLstUpd in the selector 62 that performs a call selection function and a vocoding function. To transmit (step S95). Subsequently, a peripheral base station information update message NLUM is generated and transmitted to the selector 62 (step S97).

Through this process, the soft handoff of the mobile station 10 is completed, so that the mobile station 10 can make a continuous call through the IP BTS 24 of the ALL IP network.

Next, the voice call handoff method from the ALL IP network to the existing network as the existing network in the soft handoff method according to the preferred embodiment of the present invention will be described in detail with reference to FIGS. 6 to 8.

6 is a diagram illustrating a message flow for voice call handoff from an ALL IP network to a 1X network in a soft handoff method according to an embodiment of the present invention.

7 (a) to 5 (d) are tables for explaining conversion of signal messages by the handoff matching device in the message flow of FIG. 6, and FIGS. 8 (a) to 8 (e) are diagrams of FIG. Table for explaining the conversion of traffic messages by the handoff matching device in the message flow.

As shown in FIG. 2, the mobile station 10 enters the coverage of the base station controller 70 of the 1X network while performing a voice call through the IP base station 20 of the ALL IP network (see arrow B in the figure). As described above, the soft handoff according to the present invention will be described.

First, the mobile station 10 performs a call through the IP base station 20 of the ALL IP network, and when a handoff situation occurs to the base station controller 70 of the 1X network, the mobile station 10 receives a pilot strength measurement message (PSMM) from the mobile station 10. Is generated and transmitted to the control station processor 22C via the selector 22S of the IP base station controller 22 constituting the IP base station 20 (steps S32 and S34). Here, the PSMM includes information (including the ID of the base station processor 72) of the BTS 70 of the 1X network to which the mobile station 10 will be handed off.

The control station processor 22C of the IP BSC 22 generates a handoff request message HO_REQ and transmits it to the handoff matching device 40 (step S36). Here, the handoff request message (HO_REQ) is configured to include the parameters obtained from the PSMM, the main field of which is the target IP address (Dest-IP-Addr) [here, handoff matching] as shown in FIG. IP address of device 40], source IP address (Src-IP-Addr) [herein, IP address of control station processor 22C], target ID (Dest_ID) [herein, ID of handoff matching device 40 as default. Value], the source ID (Src_ID) [here, the task ID of the control station processor 22C of the ALL IP network], the signal ID (Sig_ID) (that is, the ID indicating that this signal is a handoff request message signal), and the message ID (Msg_ID). (I.e., ID indicating that this message is a handoff request message), call ID (Call_ID) (call task ID), target base station ID (Base_ID) (herein, the base station processor 72 constituting the 1X network BTS 70). ID] and a target MSC ID (Msc_ID) (here, NID (Network ID) of the 1X network BSC 60).

The handoff matching device 40 parses a handoff request message (HO_REQ) in the form of an IP packet transmitted from the control station processor 22C of the ALL IP network, and E1 corresponding to the address system of the 1X network. The signal is converted into a handoff request message (HO_REQ) in the form of an HDLC frame and transmitted to the base station processor 72 constituting the BTS 72 of the 1X network (step S38).

Here, the handoff request message (HO REQ) is configured to include the parameters obtained from the handoff request message (HO_REQ), the main field is the target ID (Dest_ID) [herein control, as shown in Figure 7 (a) ID of the station processor 72], source ID (Src_ID) [herein, the task ID of the control station processor 22C is the same as the source task ID (Src_ID) of the handoff request message (HO_REQ) as the serving task ID. ], Target task ID (Dest_TaskID), target task ID (Dest_TaskID), signal ID (Sig_ID) (that is, ID indicating that this signal is a handoff request message signal), message ID (Msg_ID) (that is, this message is handoff) ID indicating a request message) and call ID (Call_ID) (call task ID).

The handoff matching device 40 is a target base station included in the handoff request message HO_REQ from the ALL IP network, as shown in FIG. 7 (a) during the conversion to the handoff request message HO REQ. ID (Base_ID) [ID of base station processor 72 constituting 1X network BTS 70] and target MSC ID (Msc_ID) [NID (Network ID) of 1X network BSC 60]]. 70) Generates an accurate ID for the base station processor 72 and inserts it into the target ID (Dest_ID) field of the handoff request message (HO REQ) to be transmitted to the 1X network, and the handoff request message in the source ID (Src_ID) field. The task ID of the control station processor 22C, which is the source task ID (Src_ID) of (HO_REQ), is inserted. In the source task ID (Src_TaskID) field, a reference ID (Ref_id) is generated using the source IP address (Src-IP-Addr) and the source ID (Src_ID) of the handoff request message (HO_REQ). Insert). In addition, the signal ID (Sig_ID), the message ID (Msg_ID) field, and the call ID (Call_ID) field respectively include the signal ID (Sig_ID), the message ID (Msg_ID), and the call ID (Call_ID) included in the handoff request message (HO_REQ). ), The signal ID, the message ID, and the call ID corresponding to) In this manner, the handoff matching device 40 converts and generates a handoff request message HO REQ. Here, the reference ID (Ref_id) is used as an index in the subsequent message conversion.

Meanwhile, the handoff matching device 40 temporarily links a source IP address Src-IP-Addr and a source ID Src-ID included in the handoff request message HO_REQ with a reference ID Ref_id. The target ID (Dest_ID) generated for insertion into the target ID (Dest_ID) field of the handoff request message (HO REQ) is also stored. All data temporarily stored in the handoff matching device 40 referred to herein are deleted when the call ends.

Thereafter, the base station processor 72 of the 1X network BTS 70 transmits a traffic channel assignment request message (TC Assign) to the channel card 74 and transmits a channel assignment confirmation message (TC Assign Ack) from the channel card 74. The procedure of receiving a traffic channel by performing the reception is performed (steps S40 and S42).

Subsequently, the base station processor 72 of the BTS 70 generates a handoff response message (HO Response) and transmits it to the handoff matching device 40 (step S44). As shown in FIG. 7B, the handoff response message (HO Response) is a source ID of a target ID (Dest-ID) (here, a serving task ID as a serving task ID). ID (Src_TaskID) (i.e., the task ID of the control station processor of the IP BSC), source ID (Src-ID) (here, ID of the BTS 700 base station processor 72), target task ID (Dest_TaskID) [Herein, the same value as the reference ID (Ref_id) which is the source task ID (Src_TaskID) included in the handoff request message (HO REQ)), and the source task ID (Src-TaskID) [herein, the BTS 700 base station processor 72 Task ID], signal ID (Sig_ID), message ID (Msg_ID), call ID (Call_ID), traffic channel ID (Tc_ID) [traffic channel ID assigned from channel card 74], traffic channel address (Tc_Addr) [Traffic channel address allocated from the channel card 74], code channel allocation radio resource information (Code_ch) [the channel card (7) Radio resource information allocated from code channel 4).

The handoff matching device 40 parses a handoff response message (HO Response) in the form of an HDLC frame transmitted from the base station processor 72 of the 1X network BTS 70, and corresponds to an ALL IP network address system. The packet is converted into a handoff response message HO_RP and transmitted to the control station processor 22C constituting the IP BSC 22 (step S46).

Here, the handoff response message (HO_RP) is configured to include the parameters obtained from the handoff response message (HO Response), the main field of the target IP address (Dest-IP-Addr) as shown in Figure 7 (b) [In this case, the IP address of the control station processor 22C constituting the IP BSC 22], the source IP address (Src-IP-Addr) [herein, the IP address of the handoff matching device 40], and the target ID (Dest_ID). [Here, the serving task ID is the same as the source task ID Src_ID of the handoff request message HO_REQ and is the task ID of the control station processor 22C], and the source ID Src_ID (the handoff request message). Reference ID (Ref_id) generated upon conversion of (HO REQ)], Signal ID (Sig_ID) (i.e., ID indicating that this signal is a handoff response message signal), Message ID (Msg_ID) (i.e., this message is handoff) ID indicating a response message), call ID (Call_ID), traffic channel ID (Tc_ID) (from the channel card 74). Received includes a traffic channel ID], the traffic channel address (Tc_Addr) [address traffic channel assigned by the channel card 74.

In the process of converting the handoff response message (HO_RP) to the handoff matching device 40, as shown in FIG. 7 (b), the target task ID included in the handoff response message (HO Response) from the 1X network. (Dest_TaskID) Searches for the same value as the reference ID (Ref_id generated at the time of conversion of the handoff request message (HO REQ)) and corresponds to the temporarily stored source IP address (Src-IP-Addr) (ie IP BSC). Target of the handoff response message (HO_RP) to transmit the source ID (Src_ID), the source ID (Src_ID) (that is, the task ID of the control station processor of the IP BSC) and the reference ID (Ref_id) to the ALL IP network, respectively. It is inserted into an IP address (Dest-IP-Addr) field, a target ID (Dest_ID) field, and a source ID (Src_ID) field. The signal ID (Sig_ID), message ID (Msg_ID) field, call ID (Call_ID) field, traffic channel ID (Tc_ID) field, and traffic channel address (Tc_Addr) are included in the handoff response message (HO Response), respectively. Insert ID, Message ID, Call ID, Traffic Channel ID, and Traffic Channel Address.

Meanwhile, the handoff matching device 40 temporarily stores the traffic channel ID Tc_ID and the traffic channel address Tc_Addr included in the handoff response message for HO generation.

The control station processor 22C of the ALL IP network having received the handoff response message HO_RP is added to the control station processor 64 of the target BSC to ensure call quality by handoff of the mobile station 10 in a call. A configuration information request message CFG_REQ, which is a message for requesting configuration information of the pilot BTS 70, is generated and transmitted to the handoff matching device 40 (step S48).

Here, the configuration information request message CFG_REQ includes parameters obtained from the handoff response message HO_RP, and its main field is the target IP address (Dest-IP-Addr) as shown in FIG. [Here, IP address of the handoff matching device 40], Source IP address (Src-IP-Addr) [Here, IP address of the control station processor 22C], Target ID (Dest_ID) [The handoff response message (HO_RP) Reference ID (Ref_id) included in the source ID (Src_ID) field of the field), the source ID (Src_ID) (here, the task ID of the control station processor 22C of the ALL IP network), and the signal ID (Sig_ID) (that is, the present signal). Is an ID indicating that it is a configuration information request message signal, a message ID (Msg_ID) (that is, an ID indicating that this message is a configuration information request message), and a call ID (Call_ID) (call task ID).

The handoff matching device 40 parses a configuration information request message (CFG_REQ) in the form of an IP packet transmitted from the control station processor 22C of the ALL IP network, and corresponds to an E1 HDLC frame type corresponding to the address system of the 1X network. The control information is converted into a configuration information request message (CFG REQ) and transmitted to the control station processor 64 constituting the 1X network BSC 60 (step S50).

Here, the configuration information request message CFG REQ is configured to include the parameters obtained from the configuration information request message CFG_REQ, and its main field is the target ID (Dest-ID) [as shown in FIG. Here, the IP address of the control station processor 64 of the 1X network], the source ID (Src-ID) [here, the ID of the control station processor 22C of the ALL IP network], the target task ID (Dest_TaskID), and the source task ID (Src_TaskID). ) [Here, reference ID (Ref_id)], signal ID (Sig_ID) (i.e., ID indicating that this signal is a configuration information request message signal), message ID (Msg_ID) (i.e., ID indicating that this message is a configuration information request message). , Call ID (Call_ID) (call task ID).

In the process of converting the handoff matching device 40 to the configuration information request message CFG REQ, as shown in FIG. 7C, a target ID included in the configuration information request message CFG_REQ from the ALL IP network is shown. The BSC 60 refers to the Dest_ID_L (ID of the base station controller 72 of the BTS 70), which has already been generated and stored at the time of converting the handoff request message HO REQ with reference to the reference ID Ref_id of (Dest_ID). Target ID (Dest_ID) field of the configuration information request message (CFG REQ) which converts and generates the ID of the control station processor 64 of the control station and transmits the ID of the control station processor 64 of the converted BSC 60 to the 1X network. Is inserted into the SRC_ID (task ID of the control station processor 22C of the IP BSC 22) searched with reference to the reference ID (Ref_id) into the source ID (Src_ID) field, and the reference ID ( Ref_id) is inserted into the source task ID (Src_TaskID) field. In addition, a signal ID and a message ID corresponding to the signal ID Sig_ID and the message ID Msg_ID included in the configuration information request message CFG_REQ are inserted into the signal ID (Sig_ID) field and the message ID (Msg_ID) field, respectively. In this manner, the handoff matching device 40 converts and generates a configuration information request message CFG REQ.

Thereafter, the control station processor 64 of the 1X network BSC 60 generates a configuration information response message CFG RP as a response to the configuration information request message CFG REQ and transmits it to the handoff matching device 40. (Step S52). Here, the configuration information response message (CFG RP) is shown in Fig. 7 (d), the target ID (Dest_ID) (here, ID of the handoff matching device 40), source ID (Src_ID) (here BSC ( 60), target task ID (Dest_TaskID) [herein, reference ID (Ref_id) of target ID (Dest_ID) included in configuration information request message (CFG_REQ)), and source task ID (Src_TaskID). [Task ID of control station processor 64 of BSC 60], Signal ID (Sig_ID) [ID indicating that this signal is a configuration information response message signal], Message ID (Msg_ID) [This message is a configuration information response message. ID indicated].

The handoff matching device 40 parses a configuration information response message (CFG RP) in the form of an HDLC frame transmitted from the control station processor 64 of the 1X network BSC 64, and corresponds to an ALL IP network address system. The data packet is converted into a configuration information response message CFG_RP in the form of an IP packet and transmitted to the control station processor 22C of the IP BSC 22 (step S54).

Here, the configuration information response message CFG_RP is configured to include the parameters obtained from the configuration information response message CFG RP, the main field of which is the target IP address (Dest-IP-) as shown in FIG. Addr) [here IP address of the control station processor 22C of the ALL IP network], source IP address (Src-IP-Addr) [here IP address of the handoff matching device 40], target ID (Dest_ID) [here Task ID of control station processor 22C of ALL IP network], source ID (Src_ID) [herein, ID of control station processor 64 of 1X network BSC 64], signal ID (Sig_ID) (i.e. ID indicating that it is a configuration information response message signal, and call ID (Call_ID).

The handoff matching device 40 converts the configuration information response message CFG_RP into a target task ID (CFG_RP) included in the configuration information response message CFG_RP as shown in FIG. 7 (d). Refer to Dest_TaskID) [Reference ID (Ref_id)] and set the IP address (Src_IP_Addr) and task ID (Src_ID) for the control station processor 64 of the ALL IP network BSC corresponding to this reference ID (Ref_id) to 1X network, respectively. Inserted into the target IP address (Dest-IP-Addr) and target ID (Dest_ID) fields of the configuration information response message (CFG_RP) to be transmitted, and the handoff matching device 40 in the source IP address (Src-IP-Addr) field. Insert your IP address. In addition, the source ID (Src_ID) field, the signal ID (Sig_ID) field, the message ID (Msg_ID) field, and the call ID (Call_ID) respectively include the source ID (Src_ID) and the signal ID (SRC_ID) included in the CFG RP. Source ID, signal ID, message ID, and call ID corresponding to Sig_ID), message ID (Msg_ID), and call ID.

Subsequently, the control station processor 22C of the ALL IP network having received the configuration information response message CFG_RP transmits a handoff assignment message HoffAssgin to the selector 22S which performs a call selection function and a vocoding function. (Step S56).

Subsequently, the selector 22S of the ALL IP network having received the handoff assignment message HoffAssgin generates a forward time synchronization message Fwd_Time Sync and transmits it to the handoff matching device 40 (step S58). Here, the forward time synchronization message (Fwd_Time Sync) is a target IP address (Dest-IP-Addr) (here, IP address of the handoff matching device 40) and a source IP address, as shown in FIG. (Src-IP-Addr) [here IP address of selector 22S], target ID (Dest_ID) [here reference ID (Ref_id)], source ID (Src_ID) [here task ID of selector 22S], signal ID (Sig_ID), frame control information (frame_ctrl), traffic channel ID (tc_id) [ID for traffic channel allocated in 1X network], IP BSC selector ID (tsbid) [i.e., selector 22S of IP BSC 22] ID], and the IP BSC selector address ipaddr (that is, the address of the selector 22S of the IP BSC 22).

The handoff matching device 40 parses a forward time synchronization message (Fwd_Time Sync) in the form of an IP packet transmitted from the selector 22S of the IP BSC 22, and corresponds to an E1 HDLC corresponding to an address system of 1X network. The frame is converted into a forward time sync message (Fwd Time Sync) and transmitted to the channel card 74 of the 1X network BTS 70 (step S60).

Here, the Fwd Time Sync message includes parameters obtained from the Fwd Time Sync message, and its main field is the target ID (Dest-ID) as shown in FIG. [In this case, the traffic channel ID address of the channel card 74 of the BTS 70], the signal ID (Sig_ID), the frame control information (Frame_ctrl), the traffic channel ID (Tc_id) [ID for the traffic channel allocated in the 1X network. ], The service address (SVC_addr), port / selector number (Port_sel).

The handoff matching device 40 is included in the forward time synchronization message (Fwd_Time Sync) from the ALL IP network, as shown in FIG. 8 (a), during the conversion to the forward time synchronization message (Fwd Time Sync). The traffic channel address Tc_Addr-L and the traffic channel ID Tc_id-L, which are allocated from the channel card 74 of the 1X network with reference to the target ID Dest_ID (that is, the reference ID Ref_id), are stored. It is read and inserted into the target ID (Dest-ID) field and the traffic channel ID (Tc_id) field of the forward time sync message (Fwd Time Sync) to be transmitted to the 1X network, respectively. In the signal ID (Sig_ID) field, a value converted by referring to the signal ID (Sig_ID) and the pre-stored channel ID (Tc_id) included in the forward time synchronization message (Fwd_Time Sync) is inserted, and the frame control information (Frame_ctrl) is inserted. In the field, frame control information (frame_ctrl) included in the forward time synchronization message (Fwd_Time Sync) is inserted. In the service address (SVC_addr) field, a value generated by referring to a source ID (Src_ID) included in the forward time synchronization message (Fwd_Time Sync) and a reference ID (Ref_id) previously stored is inserted as a service address (SVC_addr). A port number and a selector number are arbitrarily generated and inserted into the port / selector number (Port_sel) field. In this manner, the handoff matching device 40 converts and generates a forward time sync message.

On the other hand, the handoff matching device 40 is the source ID (Src_ID) included in the forward time synchronization message (Fwd_Time Sync), IP BSC selector ID (tsbid) (that is, the selector 22S of the IP BSC 22) ID] and the IP BSC selector address ipaddr (that is, the address of the selector 22S of the IP BSC 22) are temporarily stored for subsequent message generation.

Thereafter, the channel card 74 of the 1X network BTS 70 generates a reverse time synchronization message (Rvs Time Sync) as a response to a forward time synchronization message (Fwd Time Sync) and transmits it to the handoff matching device 40. (Step S70). Here, the reverse time synchronization message (Rvs Time Sync) is shown in Figure 8 (b), the target ID (Dest_ID) (here, the service address (SVC_addr) included in the forward time synchronization message (Fwd Time Sync) and Same value], signal ID (Sig_ID) and frame control information (Frame_ctrl).

The handoff matching device 40 parses a reverse time synchronous message (Rvs Time Sync) in the form of an HDLC frame transmitted from the channel card 74 of the 1X network BTS 70, and corresponds to an ALL IP network address system. The IP packet is converted into a reverse time synchronization message (Rvs_Time Sync) and transmitted to the selector 22S of the IP BSC 22 (step S64).

Here, the Rvs_Time Sync includes parameters obtained from the Rvs Time Sync, and its main field is the target IP address (Dest-) as shown in FIG. IP-Addr) [IP address of selector 22S of IP BSC 22], source IP address (Src-IP-Addr) [herein, IP address of handoff matching device 40], and target ID (Dest-ID). ), Source ID (Src-ID), and frame control information (frame_ctrl).

The handoff matching device 40 is a target included in the reverse time synchronization message (Rvs Time Sync) from the 1X network as shown in FIG. 8 (b) during the conversion to the reverse time synchronization message (Rvs_Time Sync). A reference ID (Ref_id) is extracted from the ID (Dest_ID) (the service address (SVC_addr) generated using the source ID (Src_ID) and the reference ID (Ref_id) in the handoff matching device 40)]. Corresponding to the previously stored source ID (Src-ID) and the IP BSC selector ID (tsbid) (that is, the ID of the selector 22S of the IP BSC 22), and the IP BSC selector address (ipaddr) [ie, IP Address of selector 22S of BSC 22], and source ID (Src-ID) and IP BSC selector ID (tsbid) (i.e., ID of selector 22S of IP BSC 22) and IP BSC. The target ID (Dest_ID) field and source ID (Src-ID) of the reverse time synchronization message (Rvs_Time Sync) to transmit the selector address (ipaddr) (that is, the address of the selector 22S of the IP BSC 22) to the ALL IP network, respectively. Field and target IP address (Dest-IP) -Addr). In addition, the frame control information (frame_ctrl) field is converted by inserting the frame control information (Frame_ctrl) extracted from the reverse time synchronization message (Rvs Time Sync). In this manner, the handoff matching device 40 converts and generates a reverse time synchronization message (Rvs_Time Sync).

Next, the selector 22S of the ALL IP network IP BSC 22 that receives the reverse time synchronization message Rvs_Time Sync generates a forward traffic message Fwd_Traffic and transmits it to the handoff matching device 40 ( Step S66). Here, the forward traffic message Fwd_Traffic is a target IP address (Dest-IP-Addr) (here, IP address of the handoff matching device 40) and a source IP address (Src) as shown in FIG. -IP-Addr) [here, IP address of selector 22S of ALL IP network IP BSC 22], Target ID (Dest-ID) [here reference ID (Ref_id)], Source ID (Src-ID) [here Task ID of selector 22S], frame control information (Frame_ctrl), RC (Radio Configuration) information (RadioConfig), data rate (dataRate), traffic channel gain information (tcgain) for forward power control, power control information (PwrCtrl) ), And subchannel gain information (pcsc_gain) for forward power control.

The handoff matching device 40 parses a forward traffic message (Fwd_Traffic) in the form of an IP packet transmitted from the selector 22S of the IP BSC 22, and corresponds to an address system of 1X network in the form of an E1 HDLC frame. The data is converted into a forward traffic message (Fwd Traffic) and transmitted to the channel card 74 constituting the BTS 70 of the 1X network (step S68).

In this case, the forward traffic message (Fwd Traffic) includes parameters obtained from the forward traffic message (Fwd_Traffic), and its main field is a target ID (Dest_ID) [herein, the BTS 70 is shown in FIG. Traffic channel ID address of channel card 74], signal ID (Sig_ID), frame control information (Frame_ctrl), traffic channel gain information (tc_gain), power control information (power_control), subchannel gain information (pcsc_gain), and the like. It includes.

The handoff matching device 40 is a target ID (Dest_ID) included in the forward traffic message (Fwd_Traffic) from the ALL IP network as shown in FIG. 8 (c) during the conversion to the forward traffic message (Fwd Traffic). Read the traffic channel address (Tc_Addr-L) and the traffic channel ID (Tc_ID-L), which are allocated from the channel card 74 of the 1X network with reference to the reference ID (Ref_id), and transmit them to the 1X network. It is inserted in the target ID (Dest-ID) field and the signal ID (Sig_ID) field of the forward traffic message. In the frame control information (frame_ctr) field, frame control information (frame_ctrl) is generated and inserted using the frame control information (Frame_ctrl) and data rate information (dataRate) extracted from the forward traffic message (Fwd_Traffic). The traffic channel gain information (tcGain) and the power control information extracted from the forward traffic message (Fwd_Traffic) are respectively included in the traffic channel gain information (tc_gain) field, the power control information (power_control) field, and the subchannel gain information (pcsc_gain) field. (pwrCtrl) and subchannel gain information (pcscGain) are swapped and inserted. In this manner, the handoff matching device 40 converts and generates a forward traffic message (Fwd Traffic).

Thereafter, the channel card 74 of the BTS 70 generates a reverse traffic message (Rvs Traffic) as a response to the forward traffic message (Fwd Traffic) and transmits it to the handoff matching device 40 (step S70). Here, the reverse traffic message (Rvs Traffic) is a target ID (Dest_ID) (here, the same value as the traffic address information (Tc_Addr) included in the forward traffic message (Fwd Traffic)), as shown in Figure 8 (d) , Signal ID (Sig_ID), frame control information (Frame_ctrl) and quality measurement information (quality_metric).

The handoff matching device 40 parses a reverse traffic message (Rvs Traffic) in the form of an HDLC frame transmitted from the channel card 74 of the 1X network BTS 70, and responds to an IP packet corresponding to an ALL IP network address system. A reverse traffic message (Rvs_Traffic) of the form is converted and transmitted to the selector 22S of the IP BSC 22 (step S72).

Here, the reverse traffic message Rvs_Traffic includes parameters obtained from the reverse traffic message Rvs Traffic, and its main field is a target IP address (Dest-IP-Addr) as shown in FIG. 8 (d). [IP address of selector 22S of IP BSC 22], source IP address (Src-IP-Addr) [herein, IP address of handoff matching device 40], target ID (Dest-ID), source ID (Src-ID), frame control information (Frame_ctrl), reverse RC (Radio Configuration) information, and quality measurement information (qualityMetric).

In the process of converting the handoff matching device 40 to the reverse traffic message Rvs_Traffic, as shown in FIG. 8 (d), the target ID Dest_ID included in the reverse traffic message Rvs Traffic from the 1X network is shown. By using the traffic address information (Tc_Addr) in the field, the previously stored reference ID (Ref_id) is extracted and the previously stored source ID (Src-ID) and IP BSC selector ID ( tsbid) (i.e., ID of selector 22S of IP BSC 22) and IP BSC selector address (ipaddr) (i.e., address of selector 22S of IP BSC 22) and the source ID (Src). -ID) and IP BSC selector ID (tsbid) (i.e., ID of selector 22S of IP BSC 22), IP BSC selector address (ipaddr) (i.e. address of selector 22S of IP BSC 22). ] Are inserted into a target ID (Dest_ID) field, a source ID (Src-ID) field, and a target IP address (Dest-IP-Addr) of a reverse traffic message (Rvs_Traffic) to be transmitted to the ALL IP network, respectively. In addition, the IP address of the handoff matching device 40 is inserted in the source IP address (Src-IP-Addr) field, and the reverse RC (rev_rc) included in the reverse traffic message (Rvs Traffic) is inserted in the reverse RC (radioConfig) field. Insert In addition, the frame control information (Frame_ctrl) and the data rate (dataRate) fields respectively include frame control information (Frame_ctrl) and data rate (dataRate) in the frame control information (frame_ctrl) field included in the reverse traffic message (Rvs Traffic). Extract and insert. In addition, the quality measurement information (qualityMetric) is inserted by converting the quality measurement information (quality_metric) included in the reverse traffic message (Rvs Traffic). In this manner, the handoff matching device 40 converts and generates the reverse traffic message Rvs_Traffic.

Meanwhile, the channel card 74 of the 1X network BTS 70 transmits a reverse traffic message (Rvs Traffic) to the handoff matching device 40, allocates a code channel and power, and transmits the result of the message (MOB_ACK). Is generated and transmitted to the selector 22S constituting the IP BSC 22 of the ALL IP network via the handoff matching device 40 (steps S74 and S76).

Accordingly, the selector 22S of the IP BSC 22 that receives the message MOB_ACK generates a Universal Hand-off Direction Message (UHDM) and transmits it to the mobile station 10 (step S78). . In response, the mobile station 10 generates a hand-off complete message (HCM) and sends it to the selector 22S of the IP BSC 22 (step S80).

Thereafter, the selector 22S of the IP BSC 22 that receives the handoff completion message HCM generates a handoff completion message HOCmpl and transmits it to the control station processor 22C of the IP BSC 22 ( Step S82).

Subsequently, the control station processor 22C receiving the handoff completion message HOCmpl is added to the control station processor 64 of the target BSC to ensure call quality by handoff of the mobile station 10 in a call. A neighbor base station information request message NBR_REQ, which is a message for requesting neighbor base station information of the BTS 70, is generated and transmitted to the handoff matching device 40 (step S84).

Here, the peripheral base station information request message (NBR_REQ) is the target IP address (Dest-IP-Addr) [herein, the IP address of the handoff matching device 40] and the source IP address (Src) as shown in FIG. IP-Addr) [herein, IP address of the control station processor 22C], Target ID (Dest_ID) [Reference ID (Ref_id) included in the source ID (Src_ID) field of the handoff response message (HO_RP)], source ID (Src_ID) [here, the task ID of the control station processor 22C of the ALL IP network], the signal ID (Sig_ID) (that is, the ID indicating that this signal is a neighbor base station information request message signal), and the message ID (Msg_ID) (that is, And ID indicating that the message is a neighbor base station information request message) and a call ID (Call_ID) (call task ID).

The handoff matching device 40 parses a peripheral base station information request message (NBR_REQ) in the form of an IP packet transmitted from the control station processor 22C of the ALL IP network, and corresponds to an E1 HDLC frame corresponding to an address system of a 1X network. A base station information request message (NBR REQ) of the form is converted and transmitted to the control station processor 64 constituting the 1X network BSC 60 (step S86).

Here, the neighboring base station information request message (NBR REQ) includes parameters obtained from the neighboring base station information request message (NBR_REQ), and its main field is a target ID (Dest-ID) as shown in FIG. [In this case, the IP address of the control station processor 64 of the 1X network], the source ID (Src-ID) [here, the ID of the control station processor 22C of the ALL IP network], the target task ID (Dest_TaskID), and the source task ID. (Src_TaskID) [here reference ID (Ref_id)], signal ID (Sig_ID) (i.e., ID indicating that this signal is a neighboring base station information request message signal), message ID (Msg_ID) (i.e., this message is a neighboring base station information request message). ID), and call ID (Call_ID) (call task ID).

The handoff matching device 40 is included in the neighboring base station information request message (NBR_REQ) from the ALL IP network, as shown in FIG. 8 (e), during the conversion to the neighboring base station information request message (NBR REQ). With reference to the reference ID (Ref_id) of the target ID (Dest_ID), the BSC (Refer to the ID of the base station controller 72 of the BTS 70), which has already been generated and stored during the conversion of the handoff request message (HO REQ), is referred to as BSC ( 60. The target ID of the peripheral base station information request message (NBR REQ) which converts and generates the ID of the control station processor 64 of the BSC 60 and transmits the ID of the control station processor 64 of the converted BSC 60 to the 1X network. Dest_ID), and the previously stored Src_ID (Task ID of the control station processor 22C of the IP BSC 22) searched with reference to the reference ID (Ref_id) is inserted into the source ID (Src_ID) field. The reference ID (Ref_id) is inserted into the source task ID (Src_TaskID) field. In addition, a signal ID and a message ID corresponding to the signal ID Sig_ID and the message ID Msg_ID included in the neighbor base station information request message NBR_REQ are inserted into the signal ID (Sig_ID) field and the message ID (Msg_ID) field, respectively. . In this manner, the handoff matching device 40 converts and generates a neighbor base station information request message (NBR REQ).

Then, the control station processor 64 of the 1X network BSC 60 generates a peripheral base station information response message (NBR RP) as a response to the peripheral base station information request message (NBR REQ) and handoff matching device 40. (Step S88). Here, the peripheral base station information response message (NBR RP) is a target ID (Dest_ID) (here, ID of the handoff matching device 40) and source ID (Src_ID) (here, BSC) as shown in FIG. ID of control station processor 64 of 60], target task ID (Dest_TaskID) [herein, reference ID (Ref_id) of target ID (Dest_ID) included in peripheral base station information request message NBR_REQ)], and source task ID ( Src_TaskID) [Task ID of control station processor 64 of BSC 60], Signal ID (Sig_ID) [ID indicating that this signal is a peripheral base station information response message signal], Message ID (Msg_ID) [This message is a peripheral base station ID indicating that it is an information response message.

The handoff matching device 40 parses a peripheral base station information response message (NBR RP) in the form of an HDLC frame transmitted from the control station processor 64 of the 1X network BSC 64, and corresponds to an ALL IP network address system. Then, it converts to an IP packet type peripheral base station information response message (NBR_RP) and transmits it to the control station processor 22C of the IP BSC 22 (step S90).

Here, the neighbor base station information response message (NBR_RP) includes parameters obtained from the neighbor base station information response message (NBR RP), the main field of which is the target IP address (Dest-) as shown in FIG. IP-Addr) [herein, IP address of control station processor 22C of ALL IP network], Source IP address (Src-IP-Addr) [herein, IP address of handoff matching device 40], Target ID (Dest_ID) [Here, the task ID of the control station processor 22C of the ALL IP network], the source ID (Src_ID) [here, the ID of the control station processor 64 of the 1X network BSC 64], and the signal ID (Sig_ID) (that is, ID indicating that the signal is a neighbor base station information response message signal) and a call ID (Call_ID).

The handoff matching device 40 is a target included in the neighbor base station information response message (NBR RP) from the 1X network as shown in FIG. 8 (e) during the conversion to the neighbor base station information response message (NBR_RP). Refer to the task ID (Dest_TaskID) [reference ID (Ref_id)] to obtain the IP address (Src_IP_Addr) and the task ID (Src_ID) for the control station processor 64 of the ALL IP network BSC corresponding to this reference ID (Ref_id), respectively. Insert into the target IP address (Dest-IP-Addr) and target ID (Dest_ID) fields of the neighbor base station information response message (NBR_RP) to be transmitted to the 1X network, and handoff matching to the source IP address (Src-IP-Addr) field. Insert the IP address of device 40. In addition, the source ID (Src_ID), the signal ID (Sig_ID) field, the message ID (Msg_ID) field, and the call ID (Call_ID) respectively include the source ID (Src_ID) and the signal ID included in the NBR RP. A source ID, a signal ID, a message ID, and a call ID corresponding to the (Sig_ID), the message ID (Msg_ID), and the call ID are inserted.

Subsequently, the control station processor 22C of the ALL IP network having received the neighbor base station information response message NBR_RP sends a neighbor base station information update message NbrLstUpd to the selector 22S which performs a call selection function and a vocoding function. Create and transmit (step S92). The selector 22S then generates a peripheral base station information update message NLUM and transmits it to the mobile station 10 (step S94).

Through this process, the soft handoff of the mobile station 10 is completed so that the mobile station 10 can make a continuous call through the BTS 24 of the 1X network.

On the other hand, the present invention is not limited to the above-described specific embodiments, it can be carried out by various modifications and modifications within the scope not departing from the gist of the present invention. 4 (a) to 4 (d), 5 (a) to 5 (f), 7 (a) to 7 (d), and 8 (f) to 8 (f) described above. In the specific embodiment described with reference to the contents related to each message and the conversion process of the handoff conversion device is merely exemplary, and the contents and conversion process of such a message can be implemented in various forms. In particular, the index information for reference in a subsequent conversion process in the conversion of the handoff conversion device may use other information extracted in each message, and furthermore, independently in the handoff matching device without using information extracted from each message. You can also use the created index information.

In addition, in the above specific embodiment, the description is limited to the E1 HDLC-based 1X network. However, the present invention is not limited thereto, and it can be applied to an ATM-based 1X network. Ramen would be self explanatory. That is, the handoff matching device according to the present invention converts the ATM message of the handoff-related ATM packet form of the 1X system into an IP message-based IP base station message and delivers it to the IP base station through the Ethernet interface. It is a matter of course that the base station converts the handoff processing message transmitted in the form of IP packet into an ATM message in the form of ATM packet and transmits it to the ATM based 1X network.

As described above, according to the present invention, the handoff success rate is dramatically improved by implementing soft handoff instead of hard handoff for voice call between the existing network (1X network) system and the ALL IP network system in the mobile communication network. This allows continuous handoff without disconnecting the voice call.

According to the present invention, the mobile communication network is gradually evolved from the existing network to the ALL IP network by enabling continuous handoff between the existing network (1X network) system and the ALL IP network system without disconnection of voice calls. It becomes possible.

In addition, according to the present invention, since soft handoff of the ALL IP network and the existing network (1X network) is possible, the operator's point of view does not affect the existing service when evolving from the existing network to the ALL IP network in the future. Ease of use can be secured.

Claims (28)

delete In a mobile communication network system in which a plurality of IP base stations (IP BSs) are connected through an Ethernet interface, an ALL IP network and a 1X based 1X network are combined. When the mobile station has a voice call handoff situation between the base station of the ALL IP network and the base station of the 1X network during the voice call between the base station of the ALL IP network and the base station of the 1X network, the mobile station 1X And at least one handoff matching device for converting and transferring handoff messages transmitted between network systems. The handoff matching device converts a handoff message in the form of an E1 HDLC frame or an ATM packet from a 1X network system into a handoff message in the form of an IP packet, and transmits the handoff message to an ALL IP network system through an Ethernet interface. A voice call soft handoff system between an ALL IP mobile communication network and an existing network, wherein the IP packet type handoff message is converted into an E1 HDLC frame or ATM packet type handoff message and transmitted to a 1X network system. The method of claim 2, The handoff matching device, It saves identification information and IP address of IP base station equipment of ALL IP network and utilizes it when converting handoff message from 1X network system to ALL IP network system. When converting the handoff message between the 1X network system and the ALL IP network system, the temporary information is stored along with the index information among the information included in the corresponding handoff message in the future. Address translation using identification information and IP address of the stored IP base station equipment according to the address system of the ALL IP network and the address system of the 1X network, the index information stored in the temporary storage, and the information to be used for the later handoff message conversion. A voice call soft handoff system between an ALL IP mobile communication network and an existing network, which performs message header conversion for handoff messages between a 1X network system and an ALL IP network system by a mapping algorithm. The method of claim 3, The index information is generated by using the specific field information of the handoff message to be converted voice voice soft handoff system between the mobile communication network and the existing network. The method of claim 3, The index information is generated by the handoff matching device sequentially or randomly voice call soft handoff system between the existing IP network and the existing network. delete In a mobile communication network system in which a plurality of IP base stations (IP BSs) are connected through an Ethernet interface, an ALL IP network and a 1X based 1X network are combined. When the mobile station has a voice call handoff situation between the base station of the ALL IP network and the base station of the 1X network during the voice call between the base station of the ALL IP network and the base station of the 1X network, the mobile station 1X Handoff messages transmitted between network systems are converted and transmitted according to the address system of the ALL IP network and the address system of the 1X network, Handoff messages from 1X network systems are in the form of E1 HDLC frames or ATM packets, and handoff messages in ALL IP network systems are in the form of IP packets. A handoff message in the form of an E1 HDLC frame or an ATM packet from the 1X network system is converted into a handoff message in the form of an IP packet and forwarded to an ALL IP network system. A handoff message in the form of an IP packet from an ALL IP network is E1. A voice call soft handoff method between an ALL IP mobile communication network and an existing network, which is converted into a handoff message in the form of an HDLC frame or an ATM packet and transmitted to a 1X network system. The method of claim 7, wherein When converting the handoff message, the identification information and IP address of the previously stored IP base station equipment are used, and when the handoff message is converted between the 1X network system and the ALL IP network system, the handoff message is later included in the information contained in the corresponding handoff message. Temporarily store the information to be used for conversion with the index. The message header conversion for the handoff message between the 1X network system and the ALL IP network system is performed by an address translation mapping algorithm using the stored identification information and IP address of the stored IP base station equipment and the temporarily stored index and information. The voice call soft handoff method between the ALL IP mobile communication network and the existing network, characterized in that. The method according to any one of claims 7 to 8, The message conversion process, When the mobile station performs a handoff situation to the ALL IP network while making a call through the 1X network, Parsing a handoff request message (HO_REQ) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Acquiring previously stored IP addresses for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the handoff request message (HO_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff request message (HO_REQ) in association with index information; By using the IP address of the acquired IP base station equipment, the information of the parsed handoff request message (HO_REQ) and the index information, a handoff request message (HO REQ) in the form of an IP packet corresponding to the address system of the ALL IP network. The voice call soft handoff method between the ALL IP mobile communication network and the existing network, the method comprising the steps of: transmitting to the ALL IP network system. The method of claim 9, The message conversion process, Parsing a handoff response message (HO RP) in the form of an IP packet received from an ALL IP network system; Extracting index information included in information of the parsed handoff response message (HO RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff response message (HO RP) in association with the index information; A handoff response message (HO_RP in the form of an E1 HDLC frame or ATM packet) corresponding to an address system of a 1X network using information acquired in association with the index information and information of the parsed handoff response message (HO RP). The voice call soft handoff method between the ALL IP mobile communication network and the existing network, the method further comprising the step of transmitting the 1X network system. The method of claim 10, The message conversion process, Parsing a configuration information request message (CFG_REQ) in the form of an E1 HDLC frame or ATM packet received from a 1X network system for requesting IP base station configuration information for a current pilot; Acquiring previously stored IP addresses for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the configuration information request message CFG_REQ; Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information request message (CFG_REQ) in association with index information; A configuration information request message (CFG REQ) in the form of an IP packet corresponding to an address system of an ALL IP network by using the obtained IP address of the IP base station equipment, information of the parsed configuration information request message (CFG_REQ), and the index information. The voice call soft handoff method between the ALL IP mobile communication network and the existing network, the method further comprising the step of transmitting to the ALL IP network system. The method of claim 11, The message conversion process, Parsing a configuration information response message (CFG RP) received in the form of an IP packet received from an ALL IP network system; Extracting index information included in information of the parsed configuration information response message (CFG RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information response message (CFG RP) in association with the index information; A configuration information response message (CFG_RP) in the form of an E1 HDLC frame or ATM packet corresponding to an address system of a 1X network using information obtained in association with the index information and information of the parsed configuration information response message (CFG RP). The voice call soft handoff method between the ALL IP mobile communication network and the existing network, the method further comprising the step of transmitting the 1X network system. The method of claim 12, The message conversion process, Parsing a forward time synchronization message (Fwd_Time Sync) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Acquiring previously stored traffic channel IP addresses and traffic channel identification information for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the forward time synchronization message (Fwd_Time Sync); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward time synchronization message (Fwd_Time Sync) in association with index information; IP packet type corresponding to the address system of the ALL IP network by using the acquired traffic channel IP address and traffic channel identification information of the IP base station equipment, the index information, and the information of the parsed forward time synchronization message (Fwd_Time Sync). The voice call soft handoff method between the ALL IP mobile communication network and the existing network, characterized by further comprising the step of converting the forward time synchronization (Fwd Time Sync) of the transmission to the ALL IP network system. The method of claim 13, The message conversion process, Parsing a reverse time synchronization message (Rvs Time Sync) in the form of an IP packet received from an ALL IP network system; Extracting index information included in the parsed Rvs Time Sync information and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse time synchronization message (Rvs Time Sync) in association with the index information; By using information acquired in association with the index information and information of the parsed Rvs Time Sync, a backward time synchronous message in the form of an E1 HDLC frame or an ATM packet corresponding to an address system of a 1X network ( Rvs_Time Sync) and the voice call soft handoff method between the ALL IP mobile communication network and the existing network further comprising the step of transmitting to the 1X network system. The method of claim 14, The message conversion process, Parsing a forward traffic message (Fwd_Traffic) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Acquiring traffic channel IP address and traffic channel identification information of the corresponding IP base station equipment by using the identification information of the IP base station equipment to be handed off included in the forward traffic message (Fwd_Traffic); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward traffic message (Fwd_Traffic) in association with index information; By using the acquired IP address and traffic channel identification information of the IP base station equipment, the index information, and the information of the parsed forward traffic message Fwd_Traffic, the IP packet is forwarded in the form of an IP packet corresponding to the address system of the ALL IP network. The voice call soft handoff method between the ALL IP mobile communication network and the existing network, characterized by further comprising the step of converting the traffic message (Fwd Traffic) and transmitting to the ALL IP network system. The method of claim 15, The message conversion process, Parsing a reverse traffic message (Rvs Traffic) in the form of an IP packet received from an ALL IP network system; Extracting index information included in information of the parsed reverse traffic message (Rvs Traffic) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse traffic message (Rvs Traffic) in association with the index information; By using the information acquired in association with the index information and the information of the parsed RTS Traffic, a RTS_Traffic in the form of an E1 HDLC frame or an ATM packet corresponding to an address system of a 1X network is used. The voice call soft handoff method between the ALL IP mobile communication network and the existing network, characterized by further comprising the step of converting and transmitting to the 1X network system. The method of claim 16, The message conversion process, Parsing the neighbor configuration information request message (NBR_REQ) in the form of an E1 HDLC frame or ATM packet received from a 1X network system for requesting the configuration of the neighbor base station for the current pilot; Acquiring previously stored IP addresses for the corresponding IP base station equipment by using identification information of the IP base station equipment to be handed off included in the peripheral configuration information request message (NBR_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR_REQ) in association with index information; Peripheral configuration information request message in the form of an IP packet corresponding to an address system of an ALL IP network by using the obtained IP address of the IP base station equipment, information of the parsed peripheral configuration information request message (NBR_REQ), and the index information. NBR REQ) and converting the transmission to the ALL IP network system voice IP soft handoff method between the mobile communication network and the existing network, characterized in that configured further. The method of claim 17, The message conversion process, Parsing a peripheral configuration information request message (NBR RP) in the form of an IP packet received from an ALL IP network system; Extracting index information included in information of the parsed peripheral configuration information request message (NBR RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR RP) in association with the index information; Peripheral configuration information request message in the form of an E1 HDLC frame or ATM packet corresponding to an address system of a 1X network using information acquired in association with the index information and information of the parsed peripheral configuration information request message (NBR RP). The voice call soft handoff method between the ALL IP mobile communication network and the existing network, further comprising the step of converting to (NBR_RP) and transmitting the 1X network system. The method according to any one of claims 7 to 8, The message conversion process, When the mobile station makes a handoff situation to the 1X network while making a call through the ALL IP network, Parsing a handoff request message (HO_REQ) in the form of an IP packet received from the ALL IP system; Acquiring identification information of the 1X network base station equipment to be handed off using information included in the handoff request message (HO_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff request message (HO_REQ) in association with index information; A handoff request in the form of an E1 HDLC frame or ATM packet corresponding to the address system of the 1X network using the acquired identification information of the 1X network base station equipment, the information of the parsed handoff request message (HO_REQ), and the index information. The voice call soft handoff method between the ALL IP mobile communication network and the existing network comprising the steps of converting the message (HO REQ) and transmitting to the 1X network system. The method of claim 19, The message conversion process, Parsing a handoff response message (HO RP) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Extracting index information included in the parsed handoff response message (HO RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed handoff response message (HO RP) in association with the index information; By using the information acquired in association with the index information and the information of the parsed handoff response message (HO RP), it is converted into a handoff response message (HO_RP) in the form of an IP packet corresponding to the address system of the ALL IP network. The voice call soft handoff method between the ALL IP mobile communication network and the existing network further comprising the step of transmitting to the ALL IP network system. The method of claim 20, The message conversion process, Parsing a configuration information request message (CFG_REQ) in the form of an IP packet received from an ALL IP network system for requesting configuration information of a 1X network base station for a current pilot; Acquiring identification information of the corresponding 1X network base station equipment to be handed off using index information included in the configuration information request message (CFG_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information request message (CFG_REQ) in association with index information; Configuration information request in the form of an E1 HDLC frame or ATM packet corresponding to the address system of the 1X network using the acquired identification information of the 1X network base station equipment, the information of the parsed configuration information request message (CFG_REQ), and the index information. And converting the message into a CFG REQ and transmitting the same to the 1X network system. The method of claim 21, The message conversion process, Parsing a configuration information response message (CFG RP) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Extracting index information included in information of the parsed configuration information response message (CFG RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed configuration information response message (CFG RP) in association with the index information; Using the information acquired in association with the index information and the information of the parsed configuration information response message (CFG RP), it is converted into a configuration information response message (CFG_RP) in the form of an IP packet corresponding to the address system of the ALL IP network. The voice call soft handoff method between the ALL IP mobile communication network and the existing network further comprising the step of transmitting to the ALL IP network system. The method of claim 22, The message conversion process, Parsing a forward time synchronization message (Fwd_Time Sync) in the form of an IP packet received from an ALL IP network system; Acquiring previously stored traffic channel addresses and traffic channel identification information of the 1X network base station equipment to be handed off using the index information included in the forward time synchronization message (Fwd_Time Sync); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward time synchronization message (Fwd_Time Sync) in association with index information; E1 HDLC corresponding to an address system of 1X network by using the acquired traffic channel address and traffic channel identification information of the 1X network base station equipment, the index information, and the information of the parsed forward time synchronization message (Fwd_Time Sync). A voice call soft handoff method between an ALL IP mobile communication network and an existing network, the method comprising: converting a frame time or an ATM packet into a forward time sync message and transmitting the same to a 1X network system. The method of claim 23, wherein The message conversion process, Parsing a Rvs Time Sync message in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Extracting index information included in information of the parsed Rvs Time Sync and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse time synchronization message (Rvs Time Sync) in association with the index information; By using information obtained in association with the index information and information of the parsed Rvs Time Sync, a RTS_Time Sync message in the form of an IP packet corresponding to an address system of an ALL IP network is used. The voice call soft handoff method between the ALL IP mobile communication network and the existing network, the method comprising the steps of: transmitting to the ALL IP network system. The method of claim 24, The message conversion process, Parsing a forward traffic message (Fwd_Traffic) in the form of an IP packet received from an ALL IP network system; Acquiring previously stored traffic channel addresses and traffic channel identification information of the corresponding 1X network base station equipment by using index information included in the forward traffic message (Fwd_Traffic); Temporarily storing information necessary for subsequent message conversion among information of the parsed forward traffic message (Fwd_Traffic) in association with index information; E1 HDLC frame or ATM packet corresponding to the address system of 1X network using the obtained traffic channel address, traffic channel identification information of the 1X network base station equipment, the index information, and the parsed forward traffic message (Fwd_Traffic) information. And converting the data into a forward traffic message in the form of a forward traffic message and transmitting the same to a 1X network system. The method of claim 25, The message conversion process, Parsing a reverse traffic message (Rvs Traffic) in the form of an E1 HDLC frame or an ATM packet received from a 1X network system; Extracting index information included in information of the parsed reverse traffic message (Rvs Traffic) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed reverse traffic message (Rvs Traffic) in association with the index information; Using the information obtained in association with the index information and the parsed RTS Traffic information, the IP packet is converted into a RTP_Traffic in the form of an IP packet corresponding to the address system of the ALL IP network. A voice call soft handoff method between an ALL IP mobile communication network and an existing network, the method comprising: transmitting to an IP network system. The method of claim 26, The message conversion process, Parsing a peripheral configuration information request message (NBR_REQ) in the form of an IP packet received from an ALL IP network system for requesting configuration information of a peripheral base station of a 1X network for a current pilot; Acquiring identification information of the 1X network base station equipment to be handed off using index information included in the peripheral configuration information request message (NBR_REQ); Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR_REQ) in association with index information; Peripheral configuration information in the form of an E1 HDLC frame or ATM packet corresponding to an address system of the 1X network using the obtained identification information of the 1X network base station equipment and the index information of the parsed peripheral configuration information request message (NBR_REQ). The voice call soft handoff method between the ALL IP mobile communication network and the existing network, characterized in that it further comprises the step of converting the request message (NBR REQ) and transmitting to the 1X network system. The method of claim 27, The message conversion process, Parsing a peripheral configuration information request message (NBR RP) in the form of an E1 HDLC frame or ATM packet received from a 1X network system; Extracting index information included in information of the parsed peripheral configuration information request message (NBR RP) and acquiring previously stored information in association with the index information; Temporarily storing information necessary for subsequent message conversion among information of the parsed peripheral configuration information request message (NBR RP) in association with the index information; Peripheral configuration information request message (NBR_RP) in the form of an IP packet corresponding to an address system of an ALL IP network by using the information acquired in association with the index information and the parsed peripheral configuration information request message (NBR RP). The voice call soft handoff method between the ALL IP mobile communication network and the existing network, the method comprising the steps of: transmitting to the ALL IP network system.

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