Abstract: Methods and devices are provided for operating a communication service. A communication control module of the electronic device transmits information related to operation of a circuit switching service to a network device supporting a packet switching service through a communication interface. The communication control module switches radio resources of the communication interface between the packet switching service and the circuit switching service based on the information related to the operation of the circuit switching service. The information related to the operation of the circuit switching service is transmitted to the network device via a communication system module related to the packet switching service.

Abstract: Methods and devices are provided in which a voice call is made during data transmission and reception to and from an external electronic device. It is determined whether a communication status is sufficient to perform the data transmission and reception while making the voice call. The data transmission and reception is stopped if it is determined that the communication status is not sufficient to perform the data transmission and reception while making the voice call.

Abstract: The time required to set up a voice call in an exemplary embodiment, in which Circuit Switched Fallback (CSFB) is used, is reduced to provide a voice call service to a User Equipment (UE) in a Long Term Evolution (LTE) system. If a voice call occurs in a UE while the UE accesses the LTE system, the UE using CSFB switches to a 2G/3G legacy system, recycles system information for a 2G/3G cell that the UE has accessed before, and immediately proceeds with voice call setup without receiving system information unnecessary for a CSFB process.

Abstract: A position associated information providing method, implemented by an electronic device supporting the same, includes identifying a condition of position information set to an application running or execution-requested, obtaining position information corresponding to the identified condition of the position information, and providing the obtained position information to the application.

Abstract: An apparatus that uses a method for processing handover by a terminal linked to a wireless network included in heterogeneous wireless networks and conducting a voice call service is provided. The method includes determining whether the terminal is required to perform handover of another wireless network included in the heterogeneous wireless networks, and upon determining that the handover is required, performing handover to the another wireless network, wherein the handover is determined by applying at least one handover condition to each of predetermined operation modes in the terminal conducting the voice call service.

Abstract: An apparatus and a method for providing call continuity in a wireless communication system are provided. The apparatus includes a first communication unit for setting a call with a counterpart terminal in a first network, a second communication unit for setting a call with the counterpart terminal in a second network while the call is set in the first network, and a control unit for terminating the call of the first network after the call setup is completed in the second network.

Abstract: The present invention relates to a mobile communication system, and in particular, to a method and apparatus for transmitting and receiving a PDU including an Extension Bit field and a Length Indicator field in a UE or a Node B. A method for transmitting a PDU generated with more than two SDUs and a header having information on each SDU in a transmitter of a mobile communication system is provided. The method includes generating, in the header, a Length Indicator (LI) indicating an end point of each of remaining SDUs except for the last SDU and an Extension Bit indicating the presence/absence of another LI after each LI, and generating the header so that the LI succeeds the Extension Bit associated therewith; generating the PDU with the generated header and the SDUs; and transmitting the PDU.

Abstract: An apparatus and a method for providing a voice communication service using a Long Term Evolution (LTE) network in an electronic device are provided. A method includes providing a first Voice over LTE (VoLTE) service in a first LTE area, handing over to a second LTE area during the first VoLTE service, when the first VoLTE service ends, determining whether the second LTE area provides a VoLTE service, and when the second VoLTE area does not provide the VoLTE service, limiting the VoLTE service of the electronic device.

Abstract: Methods and apparatuses are provided for transmitting and receiving a Packet Data Unit (PDU) in a mobile communication system. The PDU, including a header and at least one data field, is generated. The PDU is transmitted. The header includes a length indicator (LI) field and an extension bit field. The LI field indicates a length of a corresponding data field. The extension bit field indicates whether a data field follows or a set of an extension bit field and an LI field follows. The extension bit field is placed prior to the LI field in the set of the extension bit field and the LI field. An LI field is present for every data field except a last data field.

Abstract: An apparatus and a method for providing call continuity in a wireless communication system are provided. The apparatus includes a first communication unit for setting a call with a counterpart terminal in a first network, a second communication unit for setting a call with the counterpart terminal in a second network while the call is set in the first network, and a control unit for terminating the call of the first network after the call setup is completed in the second network.

Abstract: A method in an electronic device, comprises, in response to an Internet Protocol (IP) voice packetized data call being performed in a first call session of a first communication processor and occurrence of a handover event from the first communication processor to a second communication processor, receiving at least one of, (a) a control message and (b) IP packetized voice data, via the second communication processor. The control message received from the second communication processor is forwarded to the first communication processor.

Abstract: A circuit for processing data is provided. The circuit includes an Application Processor (AP), a Communication Processor (CP), and a storage unit including at least a first region which the AP and the CP access and from/to which data related to at least one of the AP and the CP is read/written, and a second region which the CP accesses and from/to which data related to the CP is read/written.

Abstract: An apparatus and a method for controlling a Discontinuous Reception (DRX) mode in which a Communication Processor (CP) performs a predetermined operation by switching between a sleep state and an active state in a wireless terminal having an Application Processor (AP) and the CP are provided. The method includes recording a control program configured for the active state in an internal memory of the CP, waking up from the sleep state to the active state at every predetermined interval, and performing an operation required in the active state by executing the control program recorded in the internal memory via the CP, wherein the control program is a complete control module or a part of the complete control module.

Abstract: A method for switching a call by a User Equipment (UE) supporting a Voice Call Continuity (VCC) scheme in a mobile communication system is provided. The method includes detecting that there is a need for switching a voice call from a first access network to a second access network that is different from the first access network while the UE supporting the VCC scheme transmits/receives data in the first access network through an old bearer which is set up with the other party UE, performing a new bearer set up operation with the second access network, and transmitting/receiving voice data with the other party UE through the old bearer in the first access network and transmitting/receiving voice data with the other party UE through the new bearer in the second access network until a point in time.

Abstract: An apparatus and a method for reducing power consumption of an Application Processor (AP) in an electronic device are provided. The electronic device includes a first processor for supporting a first Internet Protocol (IP) Multimedia Subsystem (IMS) protocol stack, and a second processor for supporting a second IMS protocol stack. The first processor includes an AP for processing a multimedia service, and the second processor includes at least one of a Communication Processor (CP), a Modem Processor (MP), and a Baseband Processor (BP) for processing a communication service.

Abstract: A handoff method and apparatus for a terminal based on efficient set management. A pilot search rate for base stations of a neighbor set is increased, thereby preventing a failure to perform a necessary idle handoff or a failure to receive a paging message for a call connection. A terminal checks if it is in an idle state or in a traffic state, and measures the pilot energy of the BS of the active set and the pilot energy of a BS of the neighbor set with different pilot measurement patterns according to the checked state. The terminal measures the pilot of the BS of the active set and the pilots of at least one BS of the neighbor set while in the idle state. The terminal in the idle state operates in a sleep mode upon reception of information indicating that there is no paging channel, thereby minimizing its power consumption.

Abstract: The time required to set up a voice call in an exemplary embodiment, in which Circuit Switched Fallback (CSFB) is used, is reduced to provide a voice call service to a User Equipment (UE) in a Long Term Evolution (LTE) system. If a voice call occurs in a UE while the UE accesses the LTE system, the UE using CSFB switches to a 2G/3G legacy system, recycles system information for a 2G/3G cell that the UE has accessed before, and immediately proceeds with voice call setup without receiving system information unnecessary for a CSFB process.

Abstract: Provided is a method and an apparatus for processing data at a high speed by a UE for data communication. In the method, received data is divided into a header and payload information, which are then stored in different memories. In the method, header processing and payload data processing can be performed in parallel, and two memory devices can perform parallel processing without sharing a bus.

Abstract: A method for retransmitting high-speed packet data in a transmission apparatus of a mobile communication system that simultaneously performs Automatic Retransmission reQuest (ARQ) that retransmits an ARQ packet reconfigured by allocating a sequence number to data delivered from an upper layer, and Hybrid Automatic Retransmission reQuest (HARQ) that multiplexes a plurality of ARQ packets into one HARQ packet and performs repeated retransmission on the HARQ packet within a maximum retransmission limit value. A transmitting HARQ entity checks a missing ARQ packet and sends a Negative Acknowledgement (NACK) for the missing ARQ packet to a transmitting ARQ entity. The transmitting ARQ entity receives an Acknowledged (ACK) for ARQ packets from a receiving ARQ entity, detects at least one missing ARQ packet according to the NACK and the ACK, configures a retransmission packet with the detected ARQ packet, and retransmits the retransmission packet.

Abstract: A method and apparatus supports Inter-Radio Access Technology (IRAT) Packet Switch (PS) handover during a simultaneous voice and data (SVD) mode in a mobile station that supports a Radio Access Technology (RAT). The method includes determining a state in which a data call is connected through a first system and a voice call is connected through a second system. The MS determines whether handover to the second system should be performed for the data call. A measurement report message that indicates a set of active base stations (BSs) of voice call connection in the second system is generated. And the measurement report message is transmitted to a serving BS of the data call connection in the first system.