Abstract:
A method of discarding logged measurements in a wireless communication system is provided. A user equipment in a Radio Resource Control (RRC) connected mode receives a Minimization of Drive Tests (MDT) configuration from a base station and starts a validity timer upon receiving the MDT configuration. The user equipment in an RRC idle mode logs measurements based on the MDT configuration to collect logged measurements while the validity timer is running. When the validity timer is expired, the user equipment discards the MDT configuration and starts a conservation timer. When the conservation timer is expired, the logged measurements are discarded.
Abstract:
A method of performing uplink synchronization in a wireless communication system includes transmitting a random access preamble which is randomly selected from a set of random access preambles, receiving a random access response, the random access response comprising a random access preamble identifier corresponding to the random access preamble and a time alignment value for uplink synchronization, starting a time alignment timer after applying the time alignment value, starting a contention resolution timer after receiving the random access response, wherein contention resolution is not successful when the contention resolution timer is expired, and stopping the time alignment timer when the contention resolution timer is expired.
Abstract:
According to one embodiment, a method of performing a re-establishment procedure in a mobile communication system includes: receiving at least one packet data convergence protocol (PDCP) control plane data unit; performing an integrity check on the at least one PDCP control plane data unit; identifying an integrity check failure with regard to the at least one PDCP control plane data unit; and performing a re-establishment procedure if the integrity check failure is identified to exist with regard to the at least one PDCP control plane data unit.
Abstract:
A method of discarding logged measurements in a wireless communication system is provided. A user equipment in a Radio Resource Control (RRC) connected mode receives a Minimization of Drive Tests (MDT) configuration from a base station and starts a validity timer upon receiving the MDT configuration. The user equipment in an RRC idle mode logs measurements based on the MDT configuration to collect logged measurements while the validity timer is running. When the validity timer is expired, the user equipment discards the MDT configuration and starts a conservation timer. When the conservation timer is expired, the logged measurements are discarded.
Abstract:
A method for processing a handover procedure by a user equipment (UE) in a mobile communication system. The method includes receiving, by the UE, a radio resource reconfiguration message from a base station; recognizing, by the UE, a handover type based on a handover type indicator included in the received radio resource reconfiguration message; and performing, by the UE, a first or second handover procedure according to the recognized handover type. The first or second handover procedure is performed if the radio resource reconfiguration message includes mobility related information. The mobility related information includes a target physical cell identity and a new cell-radio network temporary identifier (C-RNTI).
Abstract:
A method of processing data for a Hybrid Automatic Repeat reQuest (HARQ) operation. in a wireless communication system. The method includes receiving a timing alignment command (TAC) and one or more uplink grants from a network; and generating a data unit. The one or more uplink grants are used for transmitting the generated data unit to the network. The method further includes starting a time alignment timer (TAT) upon receiving the TAC. The TAT is used to control how long a User Equipment (UE) is considered to have an uplink time that is aligned. The method further includes when the TAT expires, clearing the one or more uplink grants.
Abstract:
A method and apparatus of measuring a packet throughput in a wireless communication system are provided. When determining a reference time for estimating packet throughput, a receiver determines the time that a data burst starts or ends in order to estimate the packet throughput considering a change in the data burst of the transmitter buffer. A measurement period is defined through the determined start time and end time of the data burst, and packet throughput is measured considering the total amount of the received data burst. The throughput of packet data may be estimated by each base station based on the same standard rule, so that the measured packet throughput values may be reliable, thus allowing the operator to make use of it as a parameter for MDT.
Abstract:
A method and apparatus of communicating in a mobile communication system is provided. A user equipment (UE) receives an configuration message including information on an in-device coexistence (IDC) indication from the base station. The UE determines whether or not to transmit an IDC indication message based on the received information on the IDC indication, and transmits the IDC indication message to the base station if it is determined to transmit the IDC indication message based on the received information on the IDC indication.
Abstract:
A mobile communication technology, and, more particularly, a method for efficiently transmitting data stored in a message 3 (Msg3) buffer and a user equipment for the same is disclosed. The method of transmitting data by a user equipment in uplink includes receiving an uplink (UP) Grant signal from a base station on a specific message, determining whether there is data stored in a message 3 (Msg3) buffer when receiving the UL Grant signal on the specific message, determining whether the specific message is a random access response message, and transmitting the data stored in the Msg3 buffer to the base station using the UL Grant signal received on the specific message, if there is data stored in the Msg3 buffer when receiving the UL Grant signal on the specific message and the specific message is the random access response message.
Abstract:
A timer for processing data blocks is proposed for a receiver of a mobile communications system. If the timer is not running, the timer is started based a data block. The data block has a sequence number higher than a sequence number of another data block that was first expected to be received. If the timer is stopped or expires, the timer is based on a highest sequence number of a data block among data blocks that cannot be delivered to a higher entity. The timer can be used to prevent a stall condition in mobile communications.