Abstract: The present invention relates to a force rebalance control system and method using an automatic gain control loop, which are configured to perform the force rebalance feedback control of a vibratory gyroscope using the automatic gain control loop for controlling the velocity signal of a mass body. Accordingly, the present invention is advantageous in that a conventional digital circuit, which is complicated and sensitive to noise, can be implemented using a simple analog circuit, and the present invention can be extended and applied to general- purpose vibratory gyroscopes or various sensor fields, such as those of an inertial sensor, a pressure sensor, and a temperature sensor, as well as micro-gyroscopes. Further, a force rebalance control system using an automatic gain control loop according to the present invention is applied to various sensors, thus improving performance, such as the dynamic range, bandwidth, and linearity of the sensors.

Abstract: Disclosed is a method and system for transferring and applying a floor control scheme when a Push-To-Talk (PTT) over Cellular (PoC) session is established between PoC clients supporting various types of floor control schemes (e.g., media burst control schemes). According the method and system, when a PoC client providing Open Mobile Alliance PoC multimedia communication service supports a plurality of floor control schemes and there is no floor control scheme appointed to be supported in a session, a floor control scheme requested by a PoC session establisher is transferred through a PoC session establishment procedure and is applied to the session.

Abstract: Provided are a system for establishing and managing a Push To Talk (PTT) over Cellular (PoC) session between PoC clients supporting various media types, a method thereof, and a User Equipment (UE) therefor. When a PoC client performing an Open Mobile Alliance (OMA) PoC multimedia call service supports a plurality of media types, and media types supported by PoC clients are not common, a PoC session can be established to support only media types set to be transmitted in a first response message after the session is established. In addition, a method of efficiently managing a session by updating the session when a newly supported media type is provided or when a recipient of an existing media type is changed is suggested.

Abstract: Methods and apparatuses are provided for establishing a group session requested by the transmitting-side PoC client. Register of a service setting for receiving invitee information in the receiving-side PoC server is requested. A RTCP connection message is received from the receiving-side PoC server. The invitee information in the RTCP connection message is identified and the invitee information is provided to a user. An input of whether or not establishment of the group session has been accepted is received from the user. An RTCP response comprising the input of whether or not establishment of the group session has been accepted is created, and the RTCP response is transmitted to the receiving-side PoC server.

Abstract: A method and system for guaranteeing a seamless session when replacing a PoC terminal in a PoC system is provided, in which a currently busy PoC client can be replaced in an existing busy PoC session using a PoC compliant client capable of connecting the PoC session, thereby preventing a transmitted media stream of the running PoC session from being lost when the PoC client is replaced. The method includes transmitting, by an arbitrary PoC user, a message for replacing a terminal from a user terminal to a session management server while maintaining the session; receiving, by the session management server, the replacement request message, and transmitting an INVITE message to a terminal to be replaced, or a target terminal; and receiving, by the target terminal, the INVITE message, and media through an existing session. In a situation where there is a need to replace the PoC terminal according to change of the media for the PoC call, request of mobility, etc.

Abstract: Disclosed is a terminal apparatus and a method for providing media transmission time information in a Push-to-talk over Cellular (PoC) system. The method includes receiving a media burst granted message in response to a media burst request message, and confirming media transmission time information in the received media burst granted message, and informing a user of the confirmed media transmission time information. By the method, it is possible to recognize media transmission time information included in a floor granted message transmitted from a PoC server and informing a user of the media transmission time information.

Abstract: A method, a terminal, and a system for establishing a Push to Talk Over Cellular (PoC) group session in a PoC network based on session initiation information, such as information regarding presence of clients to be invited or session start-up time. According to the method, Universal Resource Indicator (URI) information regarding invitation and Information Reservation Service (IRS) parameters are set up in a PoC eXtensible markup language Document Management Server (XDMS), and a PoC server is requested to provide an IRS so that a session is established.

Abstract: Disclosed are a method, a User Equipment (UE) and a system for providing a simultaneous multiple session Push-to-talk over Cellular (PoC) multimedia service. A PoC client performing a PoC multimedia communication service participates in multiple sessions according to the setup of a user, and can simultaneously receive the same media streams without filtering in a PoC server when the same media streams are transmitted. Further, the PoC client can set a session, to which filtering is to be applied, from among a plurality of sessions and media types.

Abstract: An embodiment of the present invention relates to a combined accelerometer and gyroscope system. The combined accelerometer and gyroscope system includes a combined accelerometer and gyroscope for maintaining vibration of a mass body at a constant amplitude using an applied drive voltage, and detecting vibration signals in directions of an acceleration axis and an angular velocity axis. An acceleration axis vibration signal obtainment unit obtains the vibration signal in the direction of the acceleration axis. An amplitude maintenance control unit outputs an acceleration axis vibration maintenance control signal using the vibration signal. An acceleration axis driving input unit receives a voltage signal from the amplitude maintenance control unit and applies the voltage signal to the combined accelerometer and gyroscope. An angular velocity axis vibration signal obtainment unit obtains the vibration signal in the direction of the angular velocity axis.

Abstract: Disclosed is a method and system for establishing a session for a Push to Talk (PTT) over Cellular call (PoC). In the method, when an answer (response) mode of a PoC server and a PoC client are not in accordance with each other, an error message is transmitted to the receiving PoC server Moreover, call processing for a PoC call is improved by inserting a new data field indicating an automatic answer of a server into a payload of a Real-time Transport Protocol (RTCP) message, and a function of the terminal is extended using an added data field when the answer modes of the corresponding PoC server and PoC client are not in accordance with each other.

Abstract: Disclosed is a method for enabling a receiving-side Push-To-Talk (PTT)-over-Cellular (PoC) user to acquire ad-hoc group invitee information and selectively establishing a PoC session according to preference when a pre-established session and an auto-answer mode have been set between a receiving-side PoC user equipment and a PoC server in a PoC system. Particularly, in order to efficiently utilize the receiving-side Session Initiation Protocol (SIP) session setting, disclosed are a solution for transferring information related to other users expected to participate in group communication through user-plane signaling, and in addition, access rules, service setting, timers and a method for changing a response set between the client and server in order to support the solution.

Abstract: A method is disclosed which sets a PoC Box service and transmits information on a service identifier by using a standard SIP, a SDP, an XCAP, and a PAP, in order to remain compatible with conventional PoC technology when performing call processing of session connection using a PoC Box. Further, the method stores only pre-designated media in a PoC Box according to a type of media transmitted in consideration of features of a PoC multimedia session.

Abstract: Disclosed is a method and a system for a Push-To-Talk (PTT) over Cellular (PoC) session open between PoC clients supporting various types of media. Although a PoC client providing an Open Mobile Alliance (OMA) PoC multimedia communication service supports a plurality of uncommon types of media, it is possible to open a session according to media types in an independent and easier manner. Also, when a new media type is supported by a new participant during a session, it is possible to add the new media type when granting the next floor. In addition, it is possible to selectively transmit media according to media types based on the PoC user's choice.

Abstract: A method for performing session merging between PoC sessions under the environment of multiple PoC sessions is provided. A merging PoC client sends a request for the session merging with a merged session to a PoC server managing a merging session to which the PoC client belongs. The PoC server managing the merging session sends a session merge request to a PoC server managing the merged session. Negotiation of a CF (Controlling PoC Function) for managing a session to be merged is performed between the PoC server of the merging session and the PoC server of the merged session. When an entire CF of the session to be merged is selected as the negotiation between the PoC servers is completed, the PoC server of the merged session sends an UPDATE message of modified media parameters to a PoC client of the merged session.

Abstract: A system and method including registering state information capable of being published by an Event Publication Agent (EPA) using a Media Feature Tag according to Session Initiation Protocol (SIP); sending a Publication Rule for target state information from a Ruler to an associated EPA; routing the Publication Rule to the EPA; receiving, by the EPA, the Publication Rule; performing publication to an Event State Compositer (ESC) according to the Publication Rule; requesting to update or cancel the Publication Rule; receiving the request from the Ruler and modifying the Publication Rule accordingly; performing publication from the EPA to the ESC according to the modified Publication Rule; sending a Publication Rule synchronization request from the Ruler to the EPA using an event package; sending a response message to the Publication Rule synchronization request from the EPA; and sending notification of further updates of the Publication Rule from the EPA.

Abstract: As described above, when a particular PoC client participating in a PoC session requests media transmission to a PoC server during transmission of media from another PoC client, the PoC server transitions the PoC client with the floor to a suspended state by sending an MB Suspend message and grants the floor to the requesting PoC client. After media transmission of the interrupting PoC client, the PoC server returns the floor to the interrupted PoC client. Therefore, the privileged PoC client in a current PoC infrastructure interrupts the ongoing conversation and sends media, after which the floor is returned to the interrupted PoC client without issuing an explicit media request from the interrupted PoC client. Even in the pre-emptive case scenario where the pre-emptive PoC client interrupts the ongoing conversation, the conversation can be continued in a natural way.

Abstract: A method provides information of a client making a first response to a network-initiated push-to-talk-over-cellular (PoC) group session when the network-initiated PoC group session is established. When it is determined that an event meeting session establishment criteria occurs at a server managing a session, the session management server sends an INVITE message to at least one client to participate in the session to be established. A response signal to the INVITE message is received from the at least one client. A message containing information of the client making the first response is sent to the client making a request to establish the session. Thus, a user is informed of identification information of an initial caller and information of a requested conference, thereby enabling a PoC group call to be smoothly performed.

Abstract: A positioning apparatus and method of a mobile terminal using a positioning server independently constructed on a network. The positioning apparatus includes a positioning server, independently constructed on a network, for collecting and storing/managing assistant data that includes orbit information and correction information of a satellite, and providing the assistant data or position information using the assistant data in response to an external request. The positioning server provides the position information of the terminal subject to positioning in response to the request for the position information of the terminal subject to positioning created from at least one network among a plurality of networks that share the positioning server. Accordingly, an accurate positioning result can be obtained with a cost for implementation of the positioning system reduced.

Abstract: Disclosed is a multimedia message service method and system for sharing and searching for multimedia messages stored in an MM box. The MMS client has the possibility to associate an access mode (“public”, “restricted”, or “private”) to any multimedia message stored in or uploaded to an MM box. When a multimedia message is permitted to be shared, the MMS clients who have been granted access to the multimedia message can be notified of the shared multimedia message. When the MMS client requests to view or retrieve a multimedia message, the MMS relay/server checks if the MMS client has been granted permission to access to the multimedia message. If the MMS client has been granted permission to access to the multimedia message, the MMS relay/server allows the MMS client to access the multimedia message.

Abstract: A method and system collect opinions of PoC clients in a PoC network, and provide a PoC system with an opinion voting function capable of collecting the opinions and performing an opinion voting procedure regardless of whether a floor is used when a user collects the opinion. The method includes transmitting a message including a request to use a voting function and content to be voted from an arbitrary user in a group to a session management server, determining whether the voting function is occupied by another user in the group, transmitting the content to be voted to the other users in the group when the voting function is not occupied by another user, and transmitting a response of the content to be voted.