Abstract: A wireless device generating a High-Efficiency (HE) PHY Protocol Data Unit (PPDU) for transmission sets a Packet Extension Disambiguity bit of an HE Signal-A (HE-SIG-A) field of the HE PPDU based on respective durations of a packet extension of the HE PPDU and a signal extension of the HE PPDU. The wireless device may determine whether a relationship T P ? E + ( 4 × ? TXTIME - T S ? E - 2 ? 0 4 ? - ( TXTIME - T S ? E - 2 ? 0 ) ) ? T S ? Y ? M is satisfied, where TPE is the duration of the packet extension, TXTIME is a transmission time of the HE PPDU, TSE is the duration of the signal extension, and TSYM is a duration of symbols in a data field of the HE PPDU. The wireless device may set the Packet Extension Disambiguity bit to one when the relationship is satisfied; and to zero when the relationship is not satisfied.

Abstract: A method for communicating with a base station, by a terminal, in a mobile communication system is provided. The method includes receiving, from the base station, communication period-related information corresponding to a type of the terminal; determining at least one of a communication idle period and a communication duration based on the communication period-related information; transmitting, to the base station, information indicating at least one of the communication idle period and the communication duration; and communicating with the base station based on at least one of the communication idle period and the communication duration.

Abstract: A preamble transmission method for a wireless communication system is provided for improving the probability of successful transmission and reducing unnecessary retransmission power consumption. The preamble transmission method of the present invention calculates an initial transmission power; transmits a preamble with the initial transmission power through a random access channel; if an acknowledgement is received in response to the preamble, starts transmission of data; and if no acknowledgement is received in response to the preamble—calculates a retransmission power, and retransmits the preamble with the retransmission power.

Abstract: An apparatus and a method for reducing power consumption of a portable terminal. The apparatus includes a controller which induces the early release of a channel formed to transmit a synchronization determine signal.

Abstract: A preamble transmission method for a wireless communication system is provided for improving the probability of successful transmission and reducing unnecessary retransmission power consumption. The preamble transmission method of the present invention calculates an initial transmission power; transmits a preamble with the initial transmission power through a random access channel; if an acknowledgement is received in response to the preamble, starts transmission of data; and if no acknowledgement is received in response to the preamble—calculates a retransmission power, and retransmits the preamble with the retransmission power.

Abstract: A method for improving the network search rate by reducing the manual network search time in a radio communication system. System information messages are periodically broadcast, and the messages include a Master Information Block (MIB) containing location area information regarding at least one Public Land Mobile Network (PLMN). The MIB of the system information message received from the network is read during a network search by a User-Equipment (UE), displaying a PLMN list, and reading a System Information Block (SIB) of a PLMN selected from the PLMN list.

Abstract: Packet service attaching apparatus and method of a mobile communication terminal are provided. The packet service attaching apparatus includes a communication part for transmitting an Attach Request message to access a Public Land Mobile Network (PLMN), receiving an Attach Accept message or an Attach Reject message, and transmitting and receiving packet data in the packet service; a message generation part for generating the Attach Request message; and a packet service part for controlling the transmission of the Attach Request message generated at the message generation part to a corresponding PLMN through the communication part, and to retransmit the Attach Request message at preset intervals when the Attach Reject message is received from the corresponding PLMN.