Electronics and Telecommunications Research Institute

Sook-Yang Kang

Hyun-Seo Park

Young-Jick Bahg

Gyung-chul Shin

Kyung-Sook Kim

Dae-Sik Kim

Je-Hun Rhee

Ae-Soon Park

Sung-Min Oh

Jung-Sook Bae

Mahn-Hoon Lee

Yong-Ik Yoon

Kim Kyung-Sook

A method and apparatus for handover is provided. In a network environment in which a plurality of beams are provided within a base station, a terminal measures signal strength of a serving beam and signal strength of a target beam and transmits a measurement report message when a first condition or a second condition is satisfied. The base station determines inter-beam coordinated scheduling when the signal strength of the serving beam and target beam satisfy the first condition, and determines handover between beams when the signal strength of the serving beam and target beam satisfy the second condition. The base station transmits a message for commanding handover to the terminal when the handover between beams is determined. The terminal then stops communicating with the serving beam and performs handover to the target beam.

Method and apparatus for handover

The present invention relates to a method for establishing a connection between heterogeneous user-networks and a domain name system proxy server for controlling the same. The present invention has features of providing a method for supporting communication between user-computers included in Internet-compatible heterogeneous networks through a gateway based on an Internet public network and a domain name system proxy server for controlling the method. According to the present invention, supporting mutual communication between various networks based on one network can be expected.

Method for establishing connection between user-network of other technology and domain name system proxy server for controlling the same

A method for supporting session mobility, more particularly, a method for supporting session mobility that can move various sessions between two or more devices by using session initiation protocol (SIP). Various sessions can be simultaneously moved by utilizing a SIP PUBLISH message. Accordingly, a user can utilize various services as they are regardless of changing of service receiving device while the user utilizes various services. Also, the session mobility can be effectively supported whether the target of the session movement is known or not.

Method for supporting session mobility

The SIP-based multimedia communication system for providing mobility using lifelong numbers provides mobility through SIP network service domains and a global domain. The SIP network service domain comprises a user agent and an SIP network server. The user agent transmits request/response messages between users to set up, correct, and cancel calls, and when contact information of the user agent is registered and registration of the contact information is cancelled, requests to be informed of state changes in registration information. The SIP network server performs message routing between user agents and informs the contact information of the user agents during message routing. The global domain manages the SIP network service domains and allocates global SIP identifiers, that is, lifelong numbers to users to provide user-centered mobility.

SIP-based multimedia communication system capable of providing mobility using lifelong number and mobility providing method

A switch control method for DTMF service in a mobile switching center, is disclosed including the steps of (a) calling an ARS service system in a mobile station receiving, by a switch controller of an mobile exchange, a switch connection request for DTMF service input through a call controller of the mobile exchange through a base station if DTMF service is requested from the mobile station allocating a channel, requesting connection a lower-order processor; and sending a response after connection to the mobile station; and (b) receiving and processing a switch release request input to the call controller through the mobile station during communication after the step (a).

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Daejeon, South Korea

Sook-Yang Kang