1. Field of the Invention
The present invention relates to a dual mode terminal for supporting an access in a different network that may select a network to be connected, using a quality of service (QoS) based on a service cost, a network apparatus, and an operation method thereof.
2. Description of the Related Art
Currently, a scheme of integrating a wireless local area network (WLAN) and a cellular network may include a loose coupling scheme and a tight coupling scheme. The tight coupling scheme enables information and resources between two integrated networks to be shared. The loose coupling scheme may guarantee only a seamless operation since networks are independently operated. In this case, it may be difficult for a terminal to appropriately share entire resources of the two networks. When resources are effectively used in a wireless integration network employing the loose coupling scheme, there is a desire for a resource management method that may reflect an independent characteristic of a network.
Accordingly, a dual mode terminal migrating between two contentious wireless networks in which a Universal Mobile Telephone System (UMTS) cellular network and a WLAN are integrated in a loose coupling form may be used. Here, the UMTS cellular network may employ a mobile communication technology using, as a technology standard, a wideband code division multiple access (WCDMA) that is one of European third generation (3G) technologies. In the wireless integrated network, there is a need for a method for a network selection, a call admission control, and a data rate assignment.
Accordingly, proposed are a method for determining a handover between different networks according to an area mobility through reading of an area identifier within a predetermined district, and a call establishment control method for admitting a new call when rates of non-assignment resource blocks of an uplink and a downlink for an amount of time from a point in time when a call establishment request is received to a just-before monitoring unit time are respectively greater than or equal to call admission thresholds of the uplink and the downlink.
However, the above technology corresponds to a method that simply considers an area identification and thus, disregards a method with respect to a selection right of a user that is a characteristic of a different network. Accordingly, the above technology has no great difference with a method in a current homogeneous network and is limited to the same network even in a call admission control. Since a QoS reference value for each service type is ignored, the above technology may not satisfy a characteristic of a different network and a minimum QoS for each call.
Accordingly, there is a desire for a technology that may select a network based on a user preference in a circumstance where a terminal may access all the different networks, and may classify a sensitive quality characteristic based on a service type and determine whether a call requesting a connection is to be admitted.