摘要:
The handover method includes the steps of the base stations of the synchronous mobile communication network transmitting dummy pilot signals for the asynchronous mobile communication network, the mobile communication terminal, for which call connection with the asynchronous mobile communication network is performed through the asynchronous wireless device, determining whether the dummy pilot signals for the asynchronous mobile communication network have been received through the asynchronous wireless device; the mobile communication terminal requesting handover from the asynchronous mobile communication network if it is determined that the dummy pilot signals for the asynchronous mobile communication network have been received; and the asynchronous mobile communication network determining that handover is possible, notifying the mobile communication terminal of the determination that handover is possible, and the asynchronous mobile communication network requesting handover to the synchronous mobile communication network, thus performing handover.
摘要:
The handover method includes the steps of the base stations of the synchronous mobile communication network transmitting dummy pilot signals for the asynchronous mobile communication network, the mobile communication terminal, for which call connection with the asynchronous mobile communication network is performed through the asynchronous wireless device, determining whether the dummy pilot signals for the asynchronous mobile communication network have been received through the asynchronous wireless device; the mobile communication terminal requesting handover from the asynchronous mobile communication network if it is determined that the dummy pilot signals for the asynchronous mobile communication network have been received; and the asynchronous mobile communication network determining that handover is possible, notifying the mobile communication terminal of the determination that handover is possible, and the asynchronous mobile communication network requesting handover to the synchronous mobile communication network, thus performing handover.
摘要:
The present invention relates to a method of controlling a mobile communication terminal and mobile communication system therefor. In the mobile communication terminal control method, a synchronous base station of a synchronous area placed at the boundary region of an asynchronous area transmits a dummy pilot signal at the same frequency as that of a signal used in the asynchronous mobile communication system and drives a synchronous modem unit of the mobile communication terminal moving from the asynchronous area to the synchronous area. A handover cell is constructed at the boundary between synchronous and asynchronous areas, and a handover base station in the handover cell transmits a signal including system information at the same frequency as that of a signal used in the asynchronous mobile communication system, thus driving the synchronous modem unit of the mobile communication terminal entering the handover cell.
摘要:
Disclosed is a mobile communication system and method for packet hand-over between asynchronous communication network and synchronous communication network, and mobile communication terminal therefor for enabling a mobile phone to be connected with a synchronous network using a call re-sending message transmitted in an asynchronous network. The mobile communication system and method saves the time that a mobile phone, which performs a packet hand-over from an asynchronous network to a synchronous network, re-connects the synchronous network with a packet call, because the call re-sending message transmitted in an asynchronous network is provided to a multi mode multi band mobile phone in case that a hand-over is requested.
摘要:
Disclosed are a method for hand-over between an asynchronous communication network and a synchronous communication network of multi mode multi band mobile communication terminal and mobile communication terminal therefor to improve the hand-over connecting rate between an asynchronous communication network and a synchronous communication network in a mixed mobile communication system of an asynchronous network and a synchronous network.
摘要:
A handover method for a mobile communication terminal is disclosed. In the handover method, a radio network controller periodically measures the wireless environment of a mobile communication terminal, determines whether handover is required, and informs the asynchronous mobile switching center of the asynchronous communication system that the handover is required. The asynchronous mobile switching center requests the handover and a synchronous mobile switching center assigns a forward channel to the mobile communication terminal. The mobile communication terminal prepares for communication with a synchronous mobile communication system according to the direction of the asynchronous mobile switching center, and causes a backward channel with respect to the synchronous communication system to be assigned to the mobile communication terminal. The synchronous mobile switching center informs the asynchronous mobile switching center that handover has been completed, and causes a connection between the asynchronous mobile switching center and the radio network controller to be released.
摘要:
In the handover method, a radio network controller periodically measures the wireless environment of a mobile communication terminal, determines whether handover is required, and informs the asynchronous mobile switching center of the asynchronous communication system that the handover is required. The asynchronous mobile switching center requests the handover and a synchronous mobile switching center assigns a forward channel to the mobile communication terminal. The mobile communication terminal prepares for communication with a synchronous mobile communication system according to the direction of the asynchronous mobile switching center, and causes a backward channel with respect to the synchronous communication system to be assigned to the mobile communication terminal. The synchronous mobile switching center informs the asynchronous mobile switching center that handover has been completed, and causes a connection between the asynchronous mobile switching center and the radio network controller to be released.
摘要:
A method and apparatus for measuring an abrasion amount and a friction force of a polishing pad using a thickness change of a slurry film in a chemical mechanical polishing operation are provided. In a preferred method, for example, a first displacement of a semiconductor wafer with respect to a polishing pad is measured during an initial stage and a first reference range of the thickness change of the slurry film is preferably set to determine a replacement time corresponding to the abrasion amount of the polishing pad. A conditioning condition of the polishing pad conditioning can also be set, and a second displacement of the semiconductor wafer with respect to the polishing pad can be measured when the surface of the semiconductor wafer is polished by the polishing pad. The first displacement is then preferably compared with the second displacement to calculate the thickness change of the slurry film formed between the polishing pad and the semiconductor wafer. When the thickness change of the slurry film is out of the first reference range, the polishing pad is preferably replaced. When the surface state of the polishing pad corresponding to the thickness change of the slurry film fails the conditioning condition, a conditioning operation to condition the surface of the polishing pad is preferably performed.
摘要:
A wafer polishing apparatus includes a polishing tape extending between two guide rollers, a first surface of the polishing tape contacting a surface of a wafer to be polished, a polishing head including a pusher pad, the pusher pad adapted to push the polishing tape against the surface of the wafer to be polished, a color image sensor adjacent to the polishing tape, the color image sensor being adapted to detect a color image of the polishing tape and to output a signal corresponding to the detected color image, and a controller connected to the color image sensor, the controller being adapted to receive the signal output from the color image sensor and to determine when a color of the color image detected by the color image sensor changes, a change in the color image indicating a polishing end point.
摘要:
A method and apparatus for measuring an abrasion amount and a friction force of a polishing pad using a thickness change of a slurry film in a chemical mechanical polishing operation are provided. In a preferred method, for example, a first displacement of a semiconductor wafer with respect to a polishing pad is measured during an initial stage and a first reference range of the thickness change of the slurry film is preferably set to determine a replacement time corresponding to the abrasion amount of the polishing pad. A conditioning condition of the polishing pad conditioning can also be set, and a second displacement of the semiconductor wafer with respect to the polishing pad can be measured when the surface of the semiconductor wafer is polished by the polishing pad. The first displacement is then preferably compared with the second displacement to calculate the thickness change of the slurry film formed between the polishing pad and the semiconductor wafer. When the thickness change of the slurry film is out of the first reference range, the polishing pad is preferably replaced. When the surface state of the polishing pad corresponding to the thickness change of the slurry film fails the conditioning condition, a conditioning operation to condition the surface of the polishing pad is preferably performed.