Patent application number | Description | Published |
20080214249 | Sleep Mode Controlling Apparatus and Method in Cellular System - In a cellar system providing various packet services, sleep mode operation of a terminal in an idle state is controlled. The cellular system determines a discontinuous receiving (DRX) period according to a QoS of a packet service provided to the terminal, and runs the sleep mode according to the determined DRX period. The cellular system runs the sleep mode divided into shallow sleep duration and deep sleep duration. With this manner, a paging delay to the terminal and a power consumption of the terminal may be reduced. | 09-04-2008 |
20080218209 | Device for Controlling Terminal State, Method Thereof, and Device for Transmitting Paging Message - The present invention relates to a device for controlling a state of a terminal with respect to mobility management, and a method thereof. The state of the terminal includes a disconnected state and a connected state, the connected state includes an active state and an idle state, and the active state includes an active sub-state and a standby sub-state. The terminal in the active state updates location information for each cell, and the terminal in the idle state updates the location information for each radio access network registration area including a plurality of cells. The terminal in the active sub-state performs a handover when leaving a current cell. The terminal in the standby sub-state determines a quality of service (QoS) of packet data, and performs the handover or is set to be in the idle state according to the determined QoS. | 09-11-2008 |
20090213800 | Device and Method for Controlling State in Cellular System - A terminal state controlling method and apparatus are provided. The terminal state includes a connected state and an idle state, and the connected state includes an active state and a dormant state. The active state includes a scheduling-ON state and a scheduling-OFF state. In the state controlling apparatus, a radio resource control (RRC) layer controls a transition between the active state and the dormant state, and a media access control (MAC) layer controls a transition between the scheduling-ON state and the scheduling-OFF state. | 08-27-2009 |
20100014429 | METHOD OF REPORTING MEASUREMENT INFORMATION IN PACKET BASED ON CELLULAR SYSTEM - Disclosed is a method for efficiently reporting measurement information required for handover in active-state terminals executing a power-saving operation in a packet-based communication system. The method includes the steps of: (a) receiving a discontinuous reception (DRX) period, a discontinuous transmission (DTX) period, and a measurement information report parameter that are decided by a base station; and (b) measuring channel quality according to a measurement information report period included in the measurement information report parameter, and reporting measurement information formed based on the measurement information report parameter by using radio resources allocated by the base station. | 01-21-2010 |
20100034145 | METHOD FOR RECEIVING PACKET IN MOBILE COMMUNICATION SYSTEM - Provided is a method of receiving a packet in a mobile communication system. According to a type of service provided in the present invention and activity of packet service, a mobile station operates in an operation level among DRX (discontinuous reception) operation levels that are based on operation parameters of different values and receives a packet. This results in performing efficient power consumption such that it is possible to minimize power consumption. | 02-11-2010 |
20100103889 | PREAMBLE ALLOCATION METHOD AND RANDOM ACCESS METHOD IN MOBILE COMMUNICATION SYSTEM - The present invention relates to a preamble allocation method and a random access method in a mobile communication system. In the present invention, one among preamble resources is allocated to specific mobile stations in advance, before random access. The mobile stations request random access by transmitting a preamble based on the pre-allocated preamble resource to a base station. It is therefore possible to prevent collision caused by the fact that other mobile stations transmit the same preamble. | 04-29-2010 |
20100136987 | WIRELESS COMMUNICATION SYSTEM WITH PROTOCOL ARCHITECTURE FOR IMPROVING LATENCY - The present invention relates to a wireless communication system having protocol architecture for reducing latency of a cellular system. In the protocol architecture of the wireless communication system in the cellular system, a physical layer supports wireless transmission of the cellular system and estimates a radio channel condition. A data link layer determines a data transmission mode based on a QoS of user data and the radio channel condition estimated by the physical layer and performs segmentation and assembly of the packet data, and a network layer establishes and releases a radio bearer for transmitting packet data transmitted from the data link layer and a control command. A control service access point is provided for control information transmission between the data link layer and the physical layer. | 06-03-2010 |
20100254333 | METHOD OF TRANSMITTING AND RECEIVING RANDOM ACCESS RESPONSE INFORMATION IN RADIO COMMUNICATION SYSTEM, AND BASE STATION AND TERMINAL THEREOF - The present invention relates to a method of transmitting/receiving random access response information in a radio communication system, and a base station and a terminal thereof. According to the invention, in a case where a base station of a radio communication system transmits response information for random access processing requested from terminals, the base station determines whether to transmit non-contention-based response information and contention-based response information for each of one or more terminals, which requests random access, by one radio resource. When determining to be transmitted by one radio resource, the base station transmits the random access response information configured by the non-contention-based response information and the contention-based response information for each of one or more terminals. In addition, when determining to be transmitted by separate radio resources, the base station transmits the random access response information configured by the non-contention-based response information or the contention-based response information for each of one or more terminals. Accordingly, since the response information is efficiently configured from the point of view of allocation and utilization of radio resources, it can support variable and flexible utilization of physical layer radio resources. | 10-07-2010 |
20100278128 | RANDOM ACCESS SYSTEM FOR USING MULTI-CARRIER STRUCTURE IN MOBILE COMMUNICATION SYSTEM - Provided is a system of performing a random access between a base station and a terminal using a plurality of carriers. When using the plurality of carriers, an uplink carrier and a downlink carrier may be mapped to each other in 1:n or 1:1. The terminal may perform the random access based on mapping information between the uplink carrier and the downlink carrier. A random access success rate increases and thus a time used for the random access may decrease. A wireless resource may also be effectively used. | 11-04-2010 |
20100316016 | APPARATUS AND METHOD FOR RANDOM ACCESS IN CELLULAR SYSTEM - Disclosed is a method and apparatus for RA in a cellular system. The RA in the cellular system includes receiving an RA preamble from a terminal for RA, transmitting, to the terminal, an RA response message including a sequence of the received RA preamble and uplink resource information of the terminal and overload state information with respect to the RA, receiving control information generated based on the RA response message from the terminal through the uplink resource information, and transmitting control response information with respect to the received control information. | 12-16-2010 |
20100322144 | DATA TRANSMISSION METHOD IN COMMUNICATION SYSTEM AND RELAY APPARATUS PERFORMING THE SAME - Provided are a data transmission method in a communication system and a relay performing the same. The data transmission method in a communication system includes receiving, at a relay, an uplink buffer status report (BSR) of a terminal from the terminal, including the uplink BSR of the terminal received by the relay in an uplink BSR to be transmitted from the relay to a base station to generate a combined uplink BSR, and transmitting the combined uplink BSR to the base station even before the relay receives data stored in an uplink buffer of the terminal from the terminal. Accordingly, it is possible to reduce the transmission delay of the communication system including a relay. | 12-23-2010 |
20110026480 | HIERARCHICAL TRANSMISSION SYSTEM AND METHOD FOR VARIABLE QUALITY SERVICE ON CELLULAR SYSTEM - The present invention relates to a hierarchical transmission apparatus and method for a variable QoS, which may hierarchically transmit packet information using an available scheme and resource between a terminal and a base station, thereby supporting various QoSs in a cellular system. The hierarchical transmission method includes generating packet information, hierarchically encoding the packet information in accordance with a control parameter to generate a plurality of hierarchical packets, adapting a Multiple Input Multiple Output (MIMO) technique to the plurality of hierarchical packets to generate hierarchical packet information, and including a plurality of antennas to transmit the hierarchical packet information for each of the plurality of antennas. | 02-03-2011 |
20110065442 | METHOD OF MANAGING TERMINAL AND CONTROLLING INTERFERENCE IN SMALL BASE STATION - A method of managing a terminal and controlling an interference in a small base station is provided. The small base station, including: an access preamble control unit to assign a unique preamble for each terminal registered in the small base station; a transmitting/receiving unit to receive a random access request message from each of the terminals through the unique preamble, to transmit a reply message to each of the terminals, and to receive information about each of the terminals and a Radio Resource Control (RRC) connection request Message from each of the terminals in response to the reply message; and a terminal verification unit to verify whether each of the terminals is a registered terminal using the information about each of the terminals. | 03-17-2011 |
20110078730 | METHOD AND APPARATUS FOR SCHEDULING RADIO ACCESS TO REDUCE CHANNEL ZAPPING DELAY - Provided is a method and apparatus for scheduling a radio access to reduce a channel zapping delay. The radio access scheduling method may receive abstract information with respect to all of currently receivable channels at each channel scheduling interval, and may receive the abstract information in advance and provide the abstract information when a channel change request is received, and thereby reduce the channel zapping delay. | 03-31-2011 |
20110090840 | COMMUNICATION SYSTEM FOR REMOVING TRANSMISSION OVERHEAD - Provided is a technology that may decrease or eliminate communication overhead in a communication system including a relay. A base station included in the communication system may compress a protocol header to transmit data. The relay may receive the compressed protocol header and the data, and then decompress the compressed protocol header to transmit the decompressed protocol header to a terminal. | 04-21-2011 |
20110170472 | METHOD FOR ALLOCATING PHYSICAL LAYER CONTROL INFORMATION FOR MBMS AND METHOD FOR RECEIVING PHYSICAL LAYER CONTROL INFORMATION FOR MBMS THEREFOR - Provided are a method for allocating physical layer control information for multimedia broadcast multicast service (MBMS) and a method for receiving physical layer control information in a wireless communication system for MBMS. The method for allocating physical layer control information for MBMS includes generating physical layer control information for MBMS, and allocating the physical layer control information to a common search space and a specific search space. | 07-14-2011 |
20110170515 | RESOURCE ALLOCATION APPARATUS IN IP UPLINK - Provided is a method that may allocate uplink radio resources to a terminal, and may receive data from the terminal using the radio resources. The uplink radio resources may be allocated as contention-based radio resources in a radio network, such as a cellular system, a radio local access network (LAN), and the like, and thus, a plurality of terminals may effectively transmit data using minimum radio resources. | 07-14-2011 |
20110188461 | METHOD OF ERROR RECOVERY IN TRANSMITTING AND RECEIVING VOICE SERVICE IN PACKET BASED MOBILE COMMUNICATION SYSTEMS - Provided is a method of transmitting and receiving data using a persistent allocation scheme in order to effectively support a voice service between a base station and a mobile terminal in a packet based mobile communication system. When an error occurs in transmitting a control information that indicates whether to use a radio resource using the persistent allocation scheme, the base station may retransmit the control information and thereby maintain a communication quality. | 08-04-2011 |
20110195697 | SLEEP MODE CONTROLLING APPARATUS AND METHOD IN CELLULAR SYSTEM - In a cellar system providing various packet services, sleep mode operation of a terminal in an idle state is controlled. The cellular system determines a discontinuous receiving (DRX) period according to a QoS of a packet service provided to the terminal, and runs the sleep mode according to the determined DRX period. The cellular system runs the sleep mode divided into shallow sleep duration and deep sleep duration. With this manner, a paging delay to the terminal and a power consumption of the terminal may be reduced. | 08-11-2011 |
20110205951 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM USING RELAY - Disclosed are a data transmission/reception apparatus and method of a wireless communication system using a relay. The data transmission/reception apparatus of the relay sets a relay reception subframe (hereinafter, referred to as ‘relay-rx-sub-frame’), and reports, to a terminal within a cell coverage, that the set relay-rx-subframe is a Multicast Broadcast Single Frequency Network (MBSFN) sub-frame, so that a legacy terminal may be provided with services in a wireless communication system using the relay. | 08-25-2011 |
20110312370 | METHOD AND APPARATUS FOR SUPPORTING DISCONTINUOUS OPERATION OF BASE STATION IN WIRELESS COMMUNICATION SYSTEM AND CONTROL SYSTEM THEREOF - An operation control method in a base station of a wireless communication system includes: checking whether or not an allowed mobile station exists in coverage of the base station and overall coverage of base stations adjacent to the base station; and controlling the base station to perform transmission/reception at a predetermined period through a first discontinuous operation, when the allowed mobile station does not exist in the coverage of the base station and the overall coverage of the adjacent base stations. | 12-22-2011 |
20120039200 | METHOD OF CHANNEL MANAGEMENT FOR MULTIPLE COMPONENT CARRIER IN MOBILE COMMUNICATION SYSTEM - Disclosed are channel management methods in a multicarrier structure in a mobile communication system. Uplink (UL) and downlink (DL) channel management methods in a carrier aggregation environment are used as the channel management methods. In DL, a base station determines a component carrier (CC) of an unstable radio channel state, stops data retransmission by the CC, and notifies a terminal of retransmission stop. In UL, the base station determines a CC of an unstable radio channel state and instructs the terminal to stop data retransmission by the CC, and the terminal stops the data retransmission and initializes a retransmission buffer. Using the channel management methods in the mobile communication system employing the multicarrier structure, an increase in the number of unnecessary retransmissions is prevented, so that unnecessary retransmission and power consumption of the terminal can be reduced and the waste of radio resources and the degradation of base station performance due to unnecessary retransmission can be prevented. | 02-16-2012 |
20120039233 | APPARATUS SUPPORTING AN MBMS SERVICE - Provided is a method and apparatus that may control a configuration and operation of a network including a base station to support a multicast and broadcast multimedia service in a cellular system and may control an operation of a terminal and the like, and thus, may effectively provide a multimedia service in the cellular system. | 02-16-2012 |
20120087423 | MULTI-CELL COOPERATIVE COMMUNICATION SYSTEM AND TERMINAL DEVICE - Disclosed is a data transmission system that transmits data by using relay. The relay may select a transmission terminal from among a plurality of terminals accessing a base station. The base station may transmit base station data to the relay during a first time slot, the transmission terminal may transmit terminal data to the relay. The relay may transmit the terminal data to the base station and may transmit the base station data to the transmission terminal during a second time slot. | 04-12-2012 |
20120099419 | METHOD FOR TRANSMITTING RETRANSMISSION REQUEST INFORMATION FOR AN ERROR PACKET IN A MULTIMEDIA BROADCAST/MULTICAST SERVICE, AND METHOD FOR RETRANSMITTING A PACKET IN RESPONSE TO THE RETRANSMISSION REQUEST - Disclosed is a method in which a terminal transmits retransmission request information for an error packet of a multimedia broadcast/multicast service (MBMS), and a base station retransmits a packet in the multimedia broadcast/multicast service. The method in which the terminal transmits retransmission request information for an error packet comprises: a step of receiving an MBMS packet from the base station; a step of checking whether or not an error exists in the received MBMS packet; and a step of transmitting retransmission request information for the error packet using at least one of PUSCH, PUCCH and a random access preamble for a random access process if an error exists in the received MBMS packet. The present invention achieves improved service satisfaction among terminals located on an intercell boundary, an MBSFN boundary, and regions with a poor wireless environment. | 04-26-2012 |
20120113942 | UPLINK RECEIVING METHOD FOR A BASE STATION AND UPLINK TRANSMITTING METHOD FOR A TERMINAL USING A SHARED WIRELESS RESOURCE - The invention relates to an uplink receiving method for a base station, comprising: a step of transmitting scheduling information for a shared wireless resource to object terminals to which the shared wireless resource is to be allocated, via a downlink control channel using a scheduling identifier; a step of receiving data from at least one terminal from among the object terminals, via the shared wireless resource allocated by the scheduling information; and a step of transmitting data receipt feedback information for at least one terminal which has received data via the shared wireless resource. An uplink transmitting method for a terminal comprises: a step of receiving scheduling information for a shared wireless resource from a base station via a downlink control channel; a step of transmitting data via the shared wireless resource allocated by the scheduling information; and a step of receiving, from the base station, feedback information which indicates whether or not the data transmitted via the shared wireless resource has been successfully received. Consequently, uplink transmission procedures between the terminal and the base station are integrated and simplified to reduce uplink transmission latency. | 05-10-2012 |
20120263092 | APPARATUS AND METHOD FOR CONSTITUTING CONTROL INFORMATION FOR A MULTI-CAST BROADCAST SERVICE - The present invention relates to an apparatus and a method for constituting control information for at least one subframe allocation pattern for a multi-cast broadcast service. The method compares periods of radio frame units for each of subframe allocation patterns, sets up a unit period in which at least one subframe allocation pattern is repeated, and sets up control information containing subframe information allocated for a multi-cast broadcast service in the unit period set in the previous step. The method of the present invention enables, for example, efficient separation of MBSFN subframe for an MBMS from other MBSFN subframes. | 10-18-2012 |
20120314635 | METHOD FOR REDUCING POWER CONSUMPTION OF TERMINAL IN MOBILE COMMUNICATION SYSTEM USING MULTI-CARRIER STRUCTURE - A method for reducing power consumption of a terminal that communicates with a base station in a mobile communication system using a multi-carrier structure composed of a primary component carrier and at least one secondary component carrier comprises: receiving a discontinuous reception (DRX) parameter group for multi carriers from the base station; and setting the multi carriers to the same parameter value, by using the received parameter group. The method for reducing power consumption of the terminal further comprises: performing a downlink control channel receive operation on each carrier according to a DRX cycle. As the base station in the mobile communication system using the multi-carrier structure simplifies the DRX process for reducing power consumption of a terminal by reducing signaling load for the multi-carrier control of the terminal, it becomes possible to reduce power consumption of the terminal. | 12-13-2012 |
20130021929 | METHOD OF MOBILITY MANAGEMENT FOR MOBILE TERMINAL IN A HETEROGENEOUS NETWORK ENVIRONMENT - A method for managing mobility of a terminal in a heterogeneous network environment is provided. According to an aspect, there is provided an operation method of a terminal receiving parameters for Coordinated Multi-point transmission/reception (CoMP) operation in a heterogeneous network environment, the operation method including, at the terminal, receiving at least one parameter among a CoMP operation mode parameter, a time information parameter regarding a time at which the CoMP operation starts, a point information parameter about points that participate in the CoMP operation, and a CoMP operation parameter, from a base station, through a layer-3 message. Therefore, it is possible to avoid an unnecessary ping-pong handover and efficiently provide service continuity. | 01-24-2013 |
20130028184 | MACHINE TYPE COMMUNICATION SYSTEM - Provided is a machine type communication system. The machine type communication system comprises a machine type communication terminal and a machine type communication server. The machine type communication terminal may be applied to a navigation of a vehicle, a sensor network of a bridge, and the like, to transmit data to the machine type communication server using a wireless network. | 01-31-2013 |
20130077583 | RESOURCE ALLOCATING APPARATUS AND METHOD FOR MACHINE TYPE COMMUNICATION - There are provided a resource allocating method for machine type communication (MTC), a data transmission and reception method for an MTC device, and an MTC device using the data transmission and reception method. The transmission and reception method for the MTC device includes: receiving a downlink frame from a base station; searching for a control information block in a downlink control resource area of the downlink frame; determining whether the control information block is for MTC service or includes control information whose destination is the MTC device, using an MTC device identifier or an identifier designated for MTC service scheduling; and extracting MTC service packet data included in a radio resource for transmission of MTC data, using the control information block, according to the results of the determination. | 03-28-2013 |
20130100931 | CARRIER-AGGREGATION-BASED HANDOVER METHOD - Provided are a method for performing handover in a cellular mobile communication system that supports a carrier aggregation, and a user equipment and a node base (NodeB) using the method. A connection between the user equipment and the NodeB may be maintained and information may be exchanged using a plurality of serving carriers. Before performing the handover, the user equipment may perform measurement with respect to a neighboring NodeB supporting the carrier aggregation, and may provide parameter information to the NodeB in order to support a carrier aggregation function required for the handover. In a handover seamless environment, the continuity of a service may be provided and the performance of the service may be enhanced. | 04-25-2013 |
20130188550 | DEVICE AND METHOD FOR ALLOCATING RADIO RESOURCES IN WIRELESS COMMUNICATION NETWORK - Disclosed is a method for allocating radio resources in a wireless communication system. Subframes that use only a particular terminal or a particular terminal group are allocated through the period, offset, and number of subframes that are consecutively used, or the subframes are allocated through the period, offset, and bitmap for subframes that are available within one or a plurality of frames, whereby radio resources are effectively allocated. | 07-25-2013 |
20130229931 | METHODS OF MANAGING TERMINAL PERFORMED IN BASE STATION AND TERMINAL - Provided are methods of managing a terminal in a heterogeneous network (HetNet) environment. Between the methods, a method of managing a terminal performed in a base station includes determining whether or not a measurement change request event has occurred, and when a measurement change request event has occurred, transmitting a control message for instructing a change of a measurement operation to the terminal. Accordingly, it is possible to improve a measurement operation and discontinuous reception (DRX) operation control procedure necessary for connection control between one or more base stations and a terminal in a HetNet environment, and thereby performance of a system can be improved. | 09-05-2013 |
20130230009 | METHOD FOR CARRIER MANAGEMENT IN A CARRIER AGGREGATION ENVIRONMENT OF A MOBILE COMMUNICATION SYSTEM - Disclosed is a carrier management method for use in a carrier aggregation environment of a mobile communication system. In the method, a base station is configured to transmit a deactivation message for a secondary carrier to a terminal and change the secondary carrier to a deactivation state after a predetermined time from the transmission of the deactivation message. The terminal receives the deactivation message transmitted by the base station, and changes the secondary carrier to the deactivation state after a predetermined time from the transmission of the deactivation message. As the predetermined time, a predefined value may be used to prevent inconsistency of secondary-carrier state information that is managed by the base station and the terminal. If the carrier state management information is used, it is possible to prevent inconsistency of secondary-carrier states that are managed by the base station and the terminal and solve problems due to the inconsistency. | 09-05-2013 |
20130336365 | APPARATUS AND METHOD FOR MODULATING DATA MESSAGE BY EMPLOYING ORTHOGONAL VARIABLE SPREADING FACTOR (OVSF) CODES IN MOBILE COMMUNICATION SYSTEM - A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal. | 12-19-2013 |
20140078908 | RESOURCE ALLOCATION APPARATUS IN IP UPLINK - Provided is a method that may allocate uplink radio resources to a terminal, and may receive data from the terminal using the radio resources. The uplink radio resources may be allocated as contention-based radio resources in a radio network, such as a cellular system, a radio local access network (LAN), and the like, and thus, a plurality of terminals may effectively transmit data using minimum radio resources. | 03-20-2014 |
20140140309 | METHOD OF CHANNEL MANAGEMENT FOR MULTIPLE COMPONENT CARRIER IN MOBILE COMMUNICATION SYSTEM - Disclosed are channel management methods in a multicarrier structure in a mobile communication system. Uplink (UL) and downlink (DL) channel management methods in a carrier aggregation environment are used as the channel management methods. Using the channel management methods in the mobile communication system employing the multicarrier structure, an increase in the number of unnecessary retransmissions is prevented, so that unnecessary retransmission and power consumption of the terminal can be reduced and the waste of radio resources and the degradation of base station performance due to unnecessary retransmission can be prevented. | 05-22-2014 |
20140235273 | METHOD FOR DETERMINING POSITION OF TERMINAL IN CELLULAR MOBILE COMMUNICATION SYSTEM - Disclosed is a method for determining the position of a terminal. The method for determining the position of a terminal belonging to an overlay network environment comprises: a step in which the terminal transmits a position determination request to a positioning server; and a step in which the terminal receives, from the positioning server, position determination support information comprising a virtual cell ID allocated to transmission points surrounding the terminal. Therefore, using this method for determining the position of a terminal enables highly accurate position determination even in an overlay network environment in which a plurality of transmission points are configured so as to have the same cell ID. | 08-21-2014 |
20140247788 | METHOD FOR PAGING INFORMATION IN CELLULAR SYSTEM - Provided is a method for transmitting paging information in a cellular system. An object of the method is transmitting paging information which can improve applicability of a limited radio resource by variably and flexibly setting up and mapping a transport channel and a physical channel in order to transmit information notifying start of downlink information from a base station to a terminal in a cellular system for packet transmission. The method includes the steps of: forming a paging channel (PCH) in a transport channel corresponding to generation of paging information; setting a paging indication channel (PICH) based on the paging information and forming the paging indication channel in a radio resource of a physical layer; and allocating the paging channel to the radio resource of the physical layer. | 09-04-2014 |
20150030055 | APPARATUS AND METHOD FOR MODULATING DATA MESSAGE BY EMPLOYING ORTHOGONAL VARIABLE SPREADING FACTOR (OVSF) CODES IN MOBILE COMMUNICATION SYSTEM - A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal. | 01-29-2015 |