Abstract: A method of operating a system on chip (SoC) includes determining to switch from a selected low-power core among a plurality of low-power cores to a high-performance core among a plurality of high-performance cores, counting the number of high-performance cores that are operating among a plurality of high-performance cores, determining a maximum operating frequency of the plurality of high-performance cores based on the counted number, and switching from the selected low-power core to the selected high-performance core based on the determined maximum operating frequency.

Abstract: A dynamic library profiling method and a dynamic library profiling system including writing a first break point instruction at a start address of a dynamic library function, recording a first event count value that is a process performance management unit (PMU) count when a target process executes the first break point instruction, writing a second break point instruction to a return address of the dynamic library function, and calculating a PMU count generated in a processor core while the dynamic library function is executed, by comparing the recorded first event count value with a second event count value that is a process PMU count when the target process executes the second break point instruction, wherein the process PMU count is a cumulative value of PMU counts generated in the processor core while the target process is executed.

Abstract: A performance measurement unit includes an event counter configured to record a counter value indicating a number of events occurring in a processor core, and a shadowed event counter configured to copy the counter value recorded in the event counter to the shadowed event counter. The performance measurement unit is configured to determine a number of effective events occurring in the processor core using the event counter and the shadowed event counter. Effective events correspond to events occurring when a selected process is executed.

Abstract: Disclosed is a channel allocation method for asynchronous mobile communication system for mapping a call between channels equally. The method converts at least a mobile phone connected to a channel having a high loading dose and then connects the mobile phone to a channel having a low loading dose, in case that a difference of a loading dose between channels is greater than a predetermined value after a loading dose of available respective channel is measured in a node B/RNC and a difference of loading doses between available respective channels is calculated in an asynchronous mobile communication system.

Abstract: Disclosed is a multi-mode multi-band mobile communication terminal and a mode switching method thereof wherein a mode switching can be performed between an asynchronous network and a synchronous network by minimizing interruption in communication. According to the switching method of a multi-mode multi-band mobile communication terminal, the power of a signal received from an asynchronous network or a synchronous network is measured and the measured power of the received signal drives a modem portion, thereby switching the mode of the mobile communication terminal.

Abstract: Disclosed is a multi-mode multi-band mobile communication terminal and a mode switching method thereof wherein a mode switching can be performed between an asynchronous network and a synchronous network by minimizing interruption in communication. According to the switching method of a multi-mode multi-band mobile communication terminal, the power of a signal received from an asynchronous network or a synchronous network is measured and the measured power of the received signal drives a modem portion, thereby switching the mode of the mobile communication terminal.

Abstract: A method and apparatus are provided for sharing multipath-accessible memory between a plurality of processors, the method including connecting the plurality of processors in read/write communication to a same shared memory region; connecting the plurality of processors in read communication to a same semaphore area; selectably connecting one of the plurality of processors in write communication to the same semaphore area; exchanging shared memory access command messages between two processors for negotiating access to the same shared memory region; and storing protected variables indicative of the currently negotiated access to the same shared memory region in the same semaphore area, wherein the shared memory region has a channel relative to each processor, each channel having at least one buffer disposed for transferring a plurality of data packets in a burst mode.

Abstract: Disclosed is a multi-mode multi-band mobile communication terminal and a mode switching method thereof wherein a mode switching can be performed between an asynchronous network and a synchronous network by minimizing interruption in communication. According to the switching method of a multi-mode multi-band mobile communication terminal, the power of a signal received from an asynchronous network or a synchronous network is measured and the measured power of the received signal drives a modem portion, thereby switching the mode of the mobile communication terminal.

Abstract: Disclosed is a multi-mode multi-band mobile communication terminal and a mode switching method thereof wherein a mode switching can be performed between an asynchronous network and a synchronous network by minimizing interruption in communication. According to the switching method of a multi-mode multi-band mobile communication terminal, the power of a signal received from an asynchronous network or a synchronous network is measured and the measured power of the received signal drives a modem portion, thereby switching the mode of the mobile communication terminal.

Abstract: Disclosed herein is a mobile communication terminal and handover method therefor, which enable handover of a mobile communication terminal that is using a packet data service or is in a dormant state in a mobile communication network in which asynchronous and synchronous networks coexist. In the handover method, if a channel is assigned between a mobile communication terminal and a synchronous mobile communication system in response to a request from an asynchronous mobile communication system as a mobile communication terminal using packet data service in the asynchronous mobile communication system moves into an area of the synchronous mobile communication system, call setup is performed. A node B of the asynchronous communication releases a connection to the mobile communication system and assigns a new mobile IP to the mobile communication terminal, thus providing continuous packet data service to the mobile communication terminal.

Abstract: A method of handover in a wireless communication system in which an asynchronous system and a synchronous system are mixed is disclosed. The method comprises the steps of: the asynchronous system ordering a dual mode mobile terminal to perform a handover from the asynchronous system to the synchronous system; when the handover order is received at the mobile terminal, the mobile terminal transmitting a frame or a preamble through a reverse traffic channel to the synchronous system, reporting to the synchronous system that the handover is completed and initiating a timer of the mobile terminal which is set according to a predetermined time; the mobile terminal switching from an asynchronous vocoder into a synchronous vocoder when the timer expires; and the wireless communication system switching vocoders of asynchronous and synchronous MSCs when the report is received.

Abstract: 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 communica

Abstract: Disclosed herein is a handover method for a mobile communication terminal in a mobile communication network in which an asynchronous network and a synchronous network coexist. In the present invention, as a mobile communication terminal, which is making a call through an asynchronous mobile communication system, moves into the area of a synchronous mobile communication system, and thus a handover event occurs, the establishment of a call with a synchronous mobile communication system is performed by the automatic call termination or origination of the mobile communication terminal while a connection between the asynchronous modem unit of the mobile communication terminal and the asynchronous mobile communication system is maintained, and then the connection with the asynchronous mobile communication system is released. Accordingly, a call interruption can be prevented at the time of handover between heterogeneous networks.

Abstract: 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.

Abstract: The present invention relates to a dual band/dual mode mobile communication terminal, which can perform stable roaming between synchronous and asynchronous mobile communication networks. The mobile communication terminal of the present invention includes an antenna (410), an asynchronous RF device (420), a synchronous RF device (430), and a common module (440). The antenna (410) transmits/receives radio waves to/from an asynchronous mobile communication network (100) and a synchronous mobile communication network (200). The asynchronous RF device (420) performs asynchronous communication with the asynchronous mobile communication network (100) through the antenna (410). The synchronous RF device (430) performs synchronous communication with the synchronous mobile communication network (200) through the antenna (410).

Abstract: Disclosed herein is a mobile communication terminal and handover method therefor, which enable handover of a mobile communication terminal that is using a packet data service or is in a dormant state in a mobile communication network in which asynchronous and synchronous networks coexist. In the handover method, if a channel is assigned between a mobile communication terminal and a synchronous mobile communication system in response to a request from an asynchronous mobile communication system as a mobile communication terminal using packet data service in the asynchronous mobile communication system moves into an area of the synchronous mobile communication system, call setup is performed. A node B of the asynchronous mobile communication releases a connection to the mobile communication system and assigns a new mobile IP to the mobile communication terminal, thus providing continuous packet data service to the mobile communication terminal.

Abstract: 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.

Abstract: The present invention relates to a handover method for a dual band/dual mode mobile communication terminal between a synchronous mobile communication network and an asynchronous mobile communication network.

Abstract: In the present invention, as a mobile communication terminal, which is using service in the area of an asynchronous mobile communication system, detects signals from a synchronous mobile communication system, the mobile communication terminal repeatedly performs a process of examining whether, in a predetermined time, signals from the asynchronous mobile communication system have been detected a designated number of times, and measuring the intensity of the signals. When the number of times that the intensity of signals from the asynchronous mobile communication system is smaller than a designated number of times, or no signals from the asynchronous mobile communication system are detected, within the predetermined time, it is determined whether to perform handover of the mobile communication terminal.

Abstract: Disclosed herein is a mobile communication terminal and handover method therefor, which enable handover of a mobile communication terminal that is using a packet data service or is in a dormant state in a mobile communication network in which asynchronous and synchronous networks coexist. In the handover method, if a channel is assigned between a mobile communication terminal and a synchronous mobile communication system in response to a request from an asynchronous mobile communication system as a mobile communication terminal using packet data service in the asynchronous mobile communication system moves into an area of the synchronous mobile communication system, call setup is performed. A node B of the asynchronous communication releases a connection to the mobile communication system and assigns a new mobile IP to the mobile communication terminal, thus providing continuous packet data service to the mobile communication terminal.