KR20060040412A - Hard hans over process between wireless internet and cellular network - Google Patents

Abstract

The present invention relates to a method for handover from a portable internet network to a heterogeneous cellular mobile communication network. The present invention relates to a method for processing handover from a portable internet network to a cellular mobile communication network in a region where the portable internet network and a cellular mobile communication network are mixed. The method of claim 1, further comprising: providing neighboring cellular mobile communication network information capable of handover from the portable Internet network to the portable Internet user terminal; A second step of the portable internet user terminal measuring a received signal strength of a base station using a cellular mobile communication modem and transmitting the measurement result to the portable internet network; Determining whether to handover by using the received signal strength measurement result in the portable Internet network; A fourth step of transmitting a handover request message from the portable Internet network to a handover management server if a handover is required; A fifth step of the handover management server transmitting a handover request message to a corresponding mobile communication system; A sixth step in which the corresponding mobile communication system performs resource allocation and registration for handover and delivers a handover processing message including the result to the handover management server; A seventh step of delivering, by the handover management server, a handover processing message to a portable internet network; And an eighth step of the portable internet user terminal receiving a handover processing message from the portable internet network to perform a handover.

Mobile, Internet, Handover, Cellular, CDMA, Mobile Communication, System

Description

Handover process between handheld internet and heterogeneous cellular mobile communication system {Hard Hans Over Process between Wireless Internet and Cellular Network}             

1 is a network configuration to which the present invention is applied.

2 is a handover processing flow chart in accordance with the present invention.

The present invention relates to a handover processing method between a mobile Internet and a heterogeneous cellular mobile communication system. More particularly, the present invention provides information related to a neighboring heterogeneous mobile communication system at a boundary base station of a mobile internet, whereby a user terminal is cellular in the mobile Internet. The present invention relates to a method for enabling hard handover to a mobile communication network.

Increasing demand for Internet access raises the need for new services that support mobility while ensuring high-speed data transfer. Currently, the third generation mobile communication system supports circuit and packet services simultaneously, and thus has a disadvantage in that the network structure is complicated and expensive due to expensive equipment. On the other hand, a system covering a limited area such as a wireless LAN can provide a high-speed data service at a low cost, but there is a limit in providing a reliable service in a mobile environment and a weak mobility.

For this reason, the portable Internet service has been proposed as a semi-mobile wireless Internet service that enables high-speed Internet access even during stationary or low-speed travel using ADSL-level quality and cost.

When such a mobile Internet service starts to be provided in earnest, a user may simultaneously receive the portable Internet and a second or third generation mobile communication service using a single terminal. In other words, the portable Internet terminal can use a cellular mobile communication service such as a second generation mobile communication service, a 2.5 generation mobile communication service, and a third generation mobile communication service through a multi-band multi-mode chip. The cellular mobile communication network is used, and data services such as the Internet may use a wireless Internet network such as a portable Internet or a wireless LAN.

However, the service area of the portable Internet network suitable for high-speed wireless Internet is inevitably narrow. In other words, it is not practical to install base stations for portable Internet services in all regions of the country. Therefore, even in a region where portable Internet service is not provided, a seamless data service should be provided to the user terminal. This means that in the region where mobile Internet service is not provided, data service must be provided through the existing cellular mobile communication network.

Accordingly, the present invention provides cellular cellular communication network information in a neighboring area in a cellular Internet base station in a boundary area where a cellular Internet service is not provided, and allows a user terminal to receive data service without interruption of data. The purpose is to provide a method for handover to a mobile communication network.

According to an aspect of the present invention, there is provided a method for processing handover from a portable Internet network to a cellular mobile communication network in a region where a portable internet network and a cellular mobile communication network are mixed. Providing a neighboring cellular cellular network information which is available for overload; A second step of the portable internet user terminal measuring a received signal strength of a base station using a cellular mobile communication modem and transmitting the measurement result to the portable internet network; Determining whether to handover by using the received signal strength measurement result in the portable Internet network; A fourth step of transmitting a handover request message from the portable Internet network to a handover management server if a handover is required; A fifth step of the handover management server transmitting a handover request message to a corresponding mobile communication system; A sixth step in which the corresponding mobile communication system performs resource allocation and registration for handover and delivers a handover processing message including the result to the handover management server; A seventh step of delivering, by the handover management server, a handover processing message to a portable internet network; And an eighth step of the portable internet user terminal receiving a handover processing message from the portable internet network to perform a handover.                         

In the present invention, the portable Internet network transmits information of a cellular mobile communication system capable of handover using an unused field of a neighbor advertisement message that transmits neighbor base station information.

In addition, the portable Internet network sets the Hand off Neighbor Preference field in the Neighbor Advertisement Message to "11" to indicate that the neighboring base station is a heterogeneous mobile communication system, and uses the Neighbor BS-ID field in the Neighbor Advertisement Message to heterogeneous. The mobile communication system indicates what kind of mobile communication system the handover target base station is.

In addition, the present invention is a computer for the handover processing from the portable Internet network to the cellular mobile communication network in the region where the mobile Internet network and cellular mobile communication network is mixed, the neighboring cellular movement capable of handover from the portable Internet network to the portable Internet user terminal Providing a communication network information; A second step of the portable internet user terminal measuring a received signal strength of a base station using a cellular mobile communication modem and transmitting the measurement result to the portable internet network; Determining whether to handover by using the received signal strength measurement result in the portable Internet network; A fourth step of transmitting a handover request message from the portable Internet network to a handover management server if a handover is required; A fifth step of the handover management server transmitting a handover request message to a corresponding mobile communication system; A sixth step in which the corresponding mobile communication system performs resource allocation and registration for handover and delivers a handover processing message including the result to the handover management server; A seventh step of delivering, by the handover management server, a handover processing message to a mobile internet network; And a computer-readable recording medium having recorded thereon a program for executing the eighth step of performing a handover by the portable internet user terminal receiving a handover processing message from the portable internet network.

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

1 illustrates a network configuration in which a portable Internet and a cellular mobile communication network to which the present invention is applied are mixed.

The portable internet network includes a portable internet base station 11, a base station controller 12, and a portable internet backbone network 13. The portable Internet network also includes an authentication server (AAA) for terminal authentication, a DNS server, and a home agent (HA) for terminal location registration.

The 2.5 generation cellular cellular network includes a base station 14, a base station controller 15, a packet data serving node (PDSN) 16 for packet service, an exchange (MSC) 17, and a home location register (HLR) ( 18).

The WCDMA network, which is a third generation mobile communication network, includes a base station 19, a base station controller 20, a Serving GPRS Support Node (SGSN) 21, a Gateway GPRS Support Node (GGSN) 22, and an exchange (MSC) ( 23) and a home location register (HLR) 24. Such a cellular mobile communication network is connected to the CDMA IP backbone network 25.

A heterogeneous handover management server 26 is provided to provide a handover function according to the present invention, wherein the heterogeneous handover management server 26 is a portable Internet base station controller 12 and a 2.5 generation and 3 generation cellular mobile communication. It is connected to the base station controllers 15 and 20, the portable Internet backbone network 13, and the CDMA IP backbone network 25.

In the present invention, the user terminal is a hybrid terminal capable of connecting both a portable Internet and a mobile communication network. That is, in the present invention, the user terminal is a hybrid terminal operating in a multiband multimode.

The portable Internet backbone network and the CDMA IP backbone network basically have a structure interworking with the IP protocol. In addition, portable Internet and mobile communication networks support mobile IP to provide wireless Internet services.

In the portable Internet network, information on a heterogeneous mobile communication system is provided to a user terminal using a specific field not currently used in a neighbor advertisement message that provides neighbor base station information. In the embodiment of the present invention, the currently used hand off neighbor preference field in the neighbor advertisement message is set to "11" to indicate that the neighboring base station is a heterogeneous mobile communication network. And, using the upper bits of the Neighbor BS-ID field in the Neighbor Advertisement Message to indicate the type of mobile communication network of the base station to be handover of the heterogeneous mobile communication network.

When the user terminal receives the neighbor base station information as described above from the portable Internet base station 11, the user terminal recognizes that the base station to perform the handover is a heterogeneous cellular mobile communication network and what kind thereof is. Then, the portable Internet user terminal activates the corresponding cellular mobile communication service communication modem to measure the strength of the received signal of the neighboring mobile communication network base station 14 or 19. The user terminal transmits the measured result to the portable Internet base station controller 12 through the portable internet base station 11.

The portable Internet base station controller 12 defines a threshold of the received signal strength for handover. Accordingly, the portable internet base station controller 12 receives the received signal strength of the neighboring base station transmitted from the user terminal and the threshold for handover. The value is compared to determine whether to perform handover. The portable Internet base station controller 12 transmits a handover request message to the heterogeneous handover management server 26 when it determines that handover is necessary. At this time, the portable Internet base station controller 12 transmits the information of the neighboring cellular base station transmitted with the received signal strength from the user terminal to the heterogeneous handover management server 26.

The heterogeneous handover management server 26 transmits a message for requesting handover to the base station controller 15 or 20 of the corresponding cellular mobile communication system with reference to the handover request message.

The base station controller of the cellular mobile communication system receiving the handover request message allocates resources necessary for handover and performs a registration procedure for a new terminal.

When registration of the user terminal in the cellular mobile communication system is completed, the base station controller of the mobile communication system transmits a handover processing message to the heterogeneous handover management server 26.

The heterogeneous handover management server 26 forwards the handover processing message to the portable Internet base station controller 12. Accordingly, the handover processing message is transmitted to the portable Internet user terminal, which disconnects the connection with the portable Internet base station and connects with the base station of the cellular mobile communication system using the information transmitted from the mobile communication system.

In order to provide the present invention, when a handover request message is received in a cellular mobile communication system, a resource allocation and a mobile IP allocation and registration procedure for a user terminal should be performed. The allocated resource information and IP information should be included in the handover process message and delivered to the user terminal. In addition, in a portable Internet backbone network, a communication path must be connected to a CDMA IP backbone network so that a user terminal can continuously receive data service after handover.

A process of performing handover from the portable Internet network to the cellular mobile communication network in the above network structure will be described with reference to FIG. 2.

The portable Internet network provides information of nearby heterogeneous mobile communication systems capable of handover through a neighbor advertisement message (101). According to the present invention, a handover target system is a heterogeneous cellular system using a Hand off Neighbor Preference field and a Neighbor BS-ID field which are not currently used in a Neighbor Advertisement Message.

When the portable Internet user terminal receives the information on the neighboring base station to be handed over from the portable Internet base station, it recognizes that the base station to perform the handover is a heterogeneous cellular mobile communication system and what kind thereof is. The portable Internet user terminal activates the corresponding cellular mobile communication service communication modem to measure the received signal strength of the base station of the adjacent mobile communication system (102). Then, the portable internet user terminal transmits the measured signal strength result of the base station to the portable internet base station controller through the portable internet base station (103).

The portable Internet base station controller compares the received signal strength measurement result of the neighbor base station transmitted from the portable internet user terminal with a threshold for handover, and determines whether to perform handover. If it is determined that handover is necessary, the portable Internet base station controller transmits a handover request message including base station information for handover to a heterogeneous handover management server (104).

When the heterogeneous handover management server receives the handover request message, the heterogeneous handover management server transmits a message for requesting handover to the base station controller of the corresponding cellular mobile communication system (105).

Upon receiving the handover request message, the base station controller of the cellular mobile communication system allocates resources necessary for handover and performs a registration procedure for a new terminal (106). When the resource allocation and registration is completed, the base station controller of the mobile communication system transmits a handover processing message including system information and IP information for handover to the heterogeneous handover management server (107).

When the heterogeneous handover management server receives the handover processing message, the heterogeneous handover management server transmits the handover processing message to the corresponding mobile Internet base station controller (108).

The portable Internet base station controller transmits a handover processing message to the portable internet user terminal through the portable internet base station (109).

Accordingly, the portable Internet user terminal disconnects the connection with the portable Internet base station and starts communication with the base station of the cellular mobile communication system using the information included in the handover processing message (110).

Accordingly, the portable Internet user terminal can be provided with data without interruption using the existing cellular mobile communication system even in a region where the portable Internet service is not available.

As described above, the present invention provides information of a neighboring heterogeneous cellular system for handover to a portable Internet user terminal in a base station located at the boundary of the portable Internet network, and the portable internet user terminal uses the information to measure the received signal strength. It is delivered to the portable Internet base station controller, and the portable Internet base station controller to determine whether to handover using the received signal strength measurement results, it is possible to provide a data service even in a region where the mobile Internet service is not provided to the portable Internet user.

Claims (5)

In the handover processing method from the portable Internet network to the cellular mobile communication network in a region where the portable internet network and the cellular mobile communication network are mixed, Providing neighboring cellular mobile communication network information capable of handover from the portable Internet network to the portable Internet user terminal; A second step of the portable internet user terminal measuring a received signal strength of a base station using a cellular mobile communication modem and transmitting the measurement result to the portable internet network; Determining whether to handover by using the received signal strength measurement result in the portable Internet network; A fourth step of transmitting a handover request message from the portable Internet network to a handover management server if a handover is required; A fifth step of the handover management server transmitting a handover request message to a corresponding mobile communication system; A sixth step in which the corresponding mobile communication system performs resource allocation and registration for handover and delivers a handover processing message including the result to the handover management server; A seventh step of delivering, by the handover management server, a handover processing message to a portable internet network; And And an eighth step of the portable internet user terminal receiving a handover processing message from the portable internet network to perform a handover.  The method of claim 1, In the first step, the portable Internet network transmits information of a cellular mobile communication system capable of handover using an unused field of a neighbor advertisement message that transmits neighbor base station information.  The method of claim 2, The portable Internet network sets the Hand off Neighbor Preference field in the Neighbor Advertisement Message to "11" to indicate that the neighboring base station is a heterogeneous mobile communication system, and uses the Neighbor BS-ID field in the Neighbor Advertisement Message to move heterogeneously. A handover processing method characterized by indicating what kind of mobile communication system the base station to which the handover target of the communication system is. The method of claim 3, wherein In the fourth step, the handover request message includes information on the heterogeneous mobile communication system. In a computer for handover processing from a mobile Internet network to a cellular mobile communication network in a region where a mobile internet network and a cellular mobile communication network are mixed, Providing neighboring cellular mobile communication network information capable of handover from the portable Internet network to the portable Internet user terminal; A second step of the portable internet user terminal measuring a received signal strength of a base station using a cellular mobile communication modem and transmitting the measurement result to the portable internet network; Determining whether to handover by using the received signal strength measurement result in the portable Internet network; A fourth step of transmitting a handover request message from the portable Internet network to a handover management server if a handover is required; A fifth step of the handover management server transmitting a handover request message to a corresponding mobile communication system; A sixth step in which the corresponding mobile communication system performs resource allocation and registration for handover and delivers a handover processing message including the result to the handover management server; A seventh step of delivering, by the handover management server, a handover processing message to a portable internet network; And And a computer-readable recording medium having recorded thereon a program for executing the eighth step of performing a handover by the portable internet user terminal receiving a handover processing message from the portable internet network.

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