Patent application number | Description | Published |
20090067404 | APPARATUS AND METHOD FOR RANDOM ACCESS IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for random access in a wireless communication system are provided. In the method, a random access response message is received. The random access response message is analyzed to determine a status of a random access process. A count variable value is updated according to the status. And the count variable value is compared with at least one reference value to determine a random access period. By adaptively changing the period of periodic ranging in a wireless communication system, the probability of success is increased while the waste of resources is decreased. | 03-12-2009 |
20090086714 | Apparatus and method for estimating uplink transmission timing in wireless communication system - An apparatus and method for estimating UpLink (UL) transmission timing in a Mobile Station (MS) of a wireless communication system are provided. The method includes tracking DL timing by using a DL preamble signal received for each frame; estimating a time offset between a previous frame and a current frame by using the DL timing tracked for each frame; and estimating the UL transmission timing by using the estimated time offset. | 04-02-2009 |
20090104910 | APPARATUS AND METHOD FOR PROCESSING HANDOVER IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method for processing handover in a wireless communication system are provided. The method includes selecting a cell for handover when a HandOver (HO) drop occurs, identifying if information for communicating with a serving BS is stored, transmitting a message ranging request signal to the serving BS, identifying provision or non-provision of a service from the serving BS comprised in a response signal to the message ranging request signal, and transmitting/receiving a signal with the serving BS. | 04-23-2009 |
20090170494 | SYSTEM AND METHOD FOR PROVISIONING SERVICE FLOWS IN BROADBAND WIRELESS ACCESS COMMUNICATION - Disclosed is a system and a method for provisioning service flows in broadband wireless access communication. In a broadband wireless access communication system, if a base station receives a registration request message from a mobile station, and if the base station inserts information about service flows to be provisioned by a base station into a registration response message and transmits the registration response message to the mobile station after the registration request message is received, the mobile station determines if the mobile station transits into a normal operation mode corresponding to the information and exactly recognizes a time point at which the mobile station goes into the normal operation mode. | 07-02-2009 |
20100202396 | SYSTEM AND METHOD FOR TRANSMITTING/RECEIVING RESOURCE ALLOCATION INFORMATION IN A COMMUNICATION SYSTEM - A system is provided for transmitting/receiving downlink resource allocation information in a communication system. In the system, a base station generates first information including downlink resource allocation information necessary for supporting a first mode supported by the base station, generates second information including length information of the first information, and transmits the first information and the second information. A mobile station notifies the base station of a second mode supported by the mobile station, receives, after the notification, the first information and the second information from the base station, and skips without decoding as much downlink resource allocation information as a length corresponding to the length information without decoding, if the first mode is different from the second mode. | 08-12-2010 |
20100220641 | METHOD FOR OPERATING CONTROL SLEEP MODE IN A COMMUNICATION SYSTEM - A method for controlling a sleep mode operation by a Mobile Station (MS) in a communication system. The MS includes transitioning to an awake state in a listening interval of the sleep mode; performing any one of a first operation, a second operation and a third operation in the awake state; and after any one operation is performed, transitioning to a sleep state upon detecting that there is no data to transmit to the BS and there is no data to be received from the BS. The first operation is a process of receiving data from the BS, the second operation is a process of transmitting data to the BS, and the third operation is a process of receiving data from the BS and receiving data from the BS. | 09-02-2010 |
20130070631 | METHOD AND APPARATUS FOR MINIMIZING POWER CONSUMPTION DURING IDLE MODE IN WIRELESS COMMUNICATION SYSTEM - A method for minimizing power consumption of a terminal during a power saving mode operation in a wireless communication system includes acquiring synchronization using a frequency used in a first paging listen interval or a frequency selected in a first paging listen interval; measuring a signal quality based on the acquired synchronization; and according to the measured signal quality, determining a length of a wake-up interval for a second paging listen interval. Thus, the terminal operating in the idle mode can minimize the power consumption of the terminal through the efficient control of the synchronization acquisition overhead interval and the frequency reselection algorithm carried out based on and the channel change. | 03-21-2013 |
20140256319 | METHOD AND APPARATUS FOR PAGING TERMINATED CALL IN MOBILE COMMUNICATION SYSTEM - A method and an apparatus for paging a terminated call in a new Mobility Management Entity (MME) of a mobile communication system are provided. The method includes receiving a Tracking Area Update (TAU) REQUEST message from a target terminal which will receive a voice call when the target terminal moves from a currently accessed cell to a cell included in another Tracking Area Identity (TAI) list and the target terminal accesses a packet network, sending an inquiry to an old MME which manages a TAI about whether a terminated call paging for the target terminal is being performed, generating a TAU ACCEPT message including a voice call paging indicator when an answer corresponds to performance of the terminated call paging for the target terminal, and transmitting the TAU ACCEPT message to the target terminal. | 09-11-2014 |