Abstract:
To solve the above-mentioned problem, a method in which a terminal reports channel state information comprises the following steps: receiving, plurality from a base station, information on a plurality of patterns to be used in a channel state measurement; receiving, from the base station, selection information for selecting a pattern from among the plurality of patterns that is to be used in the channel state information to be reported to the base station; measuring a channel state using the information on the plurality of patterns; and selecting a portion of the measured channel state based on the selection information, and reporting the selected portion to the base station. The above-described solution enables the efficient reporting of channel state information including CQIICSI, thus improving communication efficiency.
Abstract:
A random access channel (RACH) management method performed by a user equipment (UE) in a mobile communication system and an apparatus are provided. The method includes receiving, from a network, a signal indicative of a resolution of contention in a RACH procedure before a contention resolution timer expires; determining, if the received signal includes a contention resolution message including a unique identifier (ID) of the UE, that the RACH procedure has been successfully completed; receiving, from the network, after the successful completion of the RACH procedure, a UE information transmit request; and transmitting, to the network, in response to receipt of the UE information transmit request, a response message including first information indicating that the contention is detected in at least one preamble transmitted for the completed RACH procedure and indicating a number of the at least one preamble in which the contention is detected.
Abstract:
A method and an apparatus for performing random access and uplink transmission of a User Equipment (UE) supporting Carrier Aggregation (CA) are provided. The method includes determining whether a Scheduling Request (SR) is pending, determining, when the SR is pending, whether an uplink transmission resource is available in a current Transmission Time Interval (TTI), determining, when the uplink transmission resource is not available, whether a Physical Uplink Control Channel (PUCCH) resource is configured for transmission of the SR, and initiating, when the PUCCH resource is not configured, a random access process in a primary cell. The random access method and apparatus of the present invention is advantageous to reduce the waste of transmission resources.
Abstract:
A method and apparatus for receiving a power headroom (PH) report by a base station in a mobile communication system supporting carrier aggregation are provided. The method includes receiving an extended PH report (PHR) including respective PHs for multiple activated serving cells and respective indicators corresponding to the respective PHs through one of the multiple serving cells, and checking each indicator to determine whether a corresponding PH is calculated based on a real transmission or a reference format. It is determined that the corresponding PH is calculated based on the real transmission, if the each indicator is set to “0”, and it is determined that the corresponding PH is calculated based on the reference format, if the each indicator is set to “1”.
Abstract:
A random access method and an apparatus of a terminal for performing random access procedure to multiple base stations in parallel in a Long Term Evolution (LTE) system supporting dual connectivity are provided. The method includes determining whether a first preamble transmission to a first cell of a first base station is overlapped with a second preamble transmission to a second cell of a second base station in a time domain, determining, when the first preamble transmission is overlapped with the second preamble transmission in the time domain, whether a sum of transmit powers calculated for the first and second preamble transmissions is greater than a maximum allowed transmit power of the terminal, and controlling, when the sum of the first and second preamble transmit powers is greater than the maximum allowed transmit power, the transmit power calculated for the second preamble transmission.
Abstract:
A system and a method that reports capability information regarding a dual mode User Equipment (UE) are provided. The UE supports Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The UE capability transmitting method includes receiving a message requesting UE capability information from an evolved Node B (eNB), generating first capability information and second capability information according to the UE capability information requesting message, and transmitting UE capability information including the first and second capability information to the eNB. The first capability information comprises FDD capability information applicable to an FDD mode or TDD capability information applicable to a TDD mode. The second capability information comprises capability information applicable to both the FDD mode and the TDD mode. The system and method can allow a dual mode UE to efficiently report its capability information.
Abstract:
A method for activating/deactivating secondary carriers of a User Equipment (UE) in a mobile communication system supporting carrier aggregation is provided. The method comprises, receiving a control message including an activation/deactivation Control Element (CE) in a first sub-frame from a Base station, identifying an activation command or a deactivation command of at least one secondary carrier based on the control message, determining whether a current sub-frame is a second sub-frame or not, performing at least one first operation for the at least one secondary carrier in a second sub-frame, and performing, when the activation/deactivation CE indicates deactivation of the at least one secondary carrier, at least one second operation for the at least one secondary carrier no later than the second sub-frame.
Abstract:
A method and user equipment (UE) for obtaining power headroom information in a communication system are provided. The method includes acquiring information for a path loss reference, wherein the information for the path loss reference indicates whether the UE applies as the path loss reference either a downlink of a primary cell or a downlink of a secondary cell (SCell), triggering a power headroom report (PHR) if a prohibitPHR-Timer expires and a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, and obtaining power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission.
Abstract:
A method and apparatus for transmitting a power headroom (PH) report by a terminal in a mobile communication system supporting carrier aggregation are provided. The method includes calculating respective PHs for multiple activated serving cells based on a real transmission or a reference format, setting respective indicators for the PHs, wherein each indicator indicates that a corresponding PH is calculated based on the real transmission or the reference format, and transmitting, to a base station, an extended PH report including the PHs and the indicators on one of the multiple activated serving cells.
Abstract:
An apparatus and a method for receiving a broadcast service from a cell supporting multiple frequency bands for a frequency by a UE in a wireless communication system is provided. The method includes determining whether a supportable frequency band combination includes a frequency band of a frequency at which a particular broadcast service may be received, and if the supportable frequency band combination includes the frequency band, transmitting, to a base station, a control message including identification information corresponding to a frequency of the broadcast service desired to be received.