Patent application number | Description | Published |
20090124261 | MOBILE COMMUNICATION SYSTEM AND BASE STATION - In a mobile communication system that switches a base station, with which a mobile terminal communicates in a cell boundary, from a first base station to a second base station according to handover control, the mobile terminal notifies assignment information on a radio resource assigned by the first base station, to the second base station during handover period, and the second base station collects the assignment information, and assigns a radio resource to a mobile terminal existing in its own cell based on the collected radio resource assignment information, so that interference from the first base station is decreased. | 05-14-2009 |
20090175228 | Base Station And Method Of Assigning Frequencies To Pilot Sequences - A base station that assigns frequencies to UP link pilot signals in a radio communication system, where the base station stores the correlation between each of a plurality of pilot sequences having different Peak to Average Power characteristics and a plurality of frequencies that are used for transmitting the pilot sequence by frequency multiplexing, and makes the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different. Moreover, the base station measures the reception quality of signals received from a user terminal, makes reference to the stored correlation and finds a pilot sequence having Peak to Average Power characteristic that correspond to said reception quality, then sends an instruction to the user terminal so that the user terminal transmits the pilot sequence using the frequencies assigned to this pilot sequence. | 07-09-2009 |
20090180443 | WIRELESS COMMUNICATION DEVICE - Upon handover, a mobile station receives, from the movement origin base station, information on the movement destination base station and information relating to a sequence to be used for transmitting a random access signal to the movement destination base station. The mobile station receives a synchronization channel signal transmitted from the movement destination base station. The mobile station transmits the random access signal to the movement destination base station at a timing offset by a prescribed period from a timing of receiving a synchronization channel and at a frequency corresponding to that of the synchronization channel. A position of the timing/frequency used for transmitting the random access signal for the handover is used exclusively by the random access signal transmitted from the mobile terminal for which a handover is being performed or is used exclusively at the same time by a plurality of mobile stations for which handovers are performed. | 07-16-2009 |
20090219876 | RADIO RESOURCE ALLOCATION CONTROL APPARATUS AND METHOD AND BASE STATION - A radio resource allocation control apparatus for controlling allocation of radio resources used in communication by a plurality of user equipment in a wireless communication system, the apparatus including a selecting unit for selecting a user equipment to which the allocation is performed by using a priority evaluation formula in which a plurality of user equipment having wireless communication characteristics that have a higher tendency of being selected as a target of the allocation vary when different coefficients are imparted. The apparatus includes a control unit for controlling the coefficients individually for the radio resources. | 09-03-2009 |
20090252112 | RADIO COMMUNICATION METHOD AND A BASE STATION AND USER TERMINAL THEREOF - In a radio communication system, each of user terminals together with transmitting a data signal to a base station using different data transmission band frequencies that are assigned by a base station, performs time-division multiplexing of a pilot signal with the data signal and transmit the resulting signal to the base station. A resource management unit of the base station decides pilot transmission bands for each user terminal so that the pilot transmission band covers the data transmission band for each user terminal by frequency offset, and instructs the user terminal to transmit pilot signals using the decided pilot transmission band frequencies. Thereby the base station can estimate channel for each frequency of the data transmission band using the pilot signal. | 10-08-2009 |
20090305693 | RADIO COMMUNICATION SYSTEM, BASE STATION AND RANDOM ACCESS CHANNEL TRANSMISSION METHOD THEREOF - A random access channel transmission method in which a user terminal selects a preamble pattern from among a plurality of known preamble patterns and transmits that preamble pattern to a base station, where that transmission method comprises: a step of dividing a cell into a plurality of areas, and setting one or more preamble patterns and the number of repetitions for transmitting the preamble pattern for each area; and a step wherein a user terminal that exists in an are close to the base station transmits a specified preamble pattern one time, and a user terminal that exists in an area far from the base station transmits another specified preamble pattern a plurality of times. | 12-10-2009 |
20100118787 | RADIO BASE STATION AND MOBILE STATION - An error detection coding processing section of the radio base station performs an error detection coding process with data including both first control data to be used for receiving a downlink signal and second control data to be used for sending an uplink signal as a unit. A sending section sends data on which the error detection coding process has been performed by the error detection coding processing section to the mobile station. | 05-13-2010 |
20100118789 | COMMUNICATION SYSTEM AND INDIVIDUAL CONTROL INFORMATION TRANSMISSION AND RECEPTION METHOD - A communication system that transmits individual control information to a plurality of respective user terminals using a shared control channel, wherein when transmitting individual control information and prescribed control information to the user terminals, a base station device divides user terminals into groups according to the contents of the prescribed control information for the respective user terminals, arranges the individual control information for each user terminal in a specified group order, creates number-in-group information wherein the number of user terminals belonging to each group is arranged in the group order, and transmits the number-in-group information together with the individual control information for each user terminal in the group order. | 05-13-2010 |
20100172373 | CONTROL DATA COMMUNICATION METHOD AND APPARATUS THEREOF - A control data communication method for multiplexing and transmitting a plurality of mutually independent types of control data by using a control channel and for separating the control data received from the control channel includes changing and transmitting patterns of reference signals included in the control channel according to a format for multiplexing the control data, detecting the format for multiplexing the transmitted control data according to the pattern of the reference signals included in the control channel, and separating the control data in correspondence with the detected format. | 07-08-2010 |
20110124359 | APPARATUS AND METHOD FOR FREQUENCY OFFSET ESTIMATION - A user terminal transmits a preamble signal generated using a Zadoff-Chu sequence. A correlation processing unit calculates autocorrelation of a received preamble signal. A preamble detection unit detects a side peak position of the autocorrelation of the preamble signal and calculates the main correlation value representing correlation at the main peak position and the side correlation value representing correlation at the side peak position. A frequency offset estimation unit estimates frequency offset that has occurred in the wireless transmission path according to the main correlation value and the side correlation value. | 05-26-2011 |
20110171944 | WIRELESS COMMUNICATION SYSTEM, REMOTE ACCESS DEVICE, AND BASE STATION DEVICE - A wireless communication system includes a base station including a determining section that determines control information indicating signal processing for each of wireless resources used for wireless communication with terminal equipment units, and remote access sections each including a first signal processing section that performs first signal processing on a first downlink signal received from the base station so as to generate a second downlink signal to be transmitted to the units via the wireless communication, and a second signal processing section that performs second signal processing on a second uplink signal received from the units via the wireless communication so as to generate a first uplink signal to be transmitted to the base station, and at least one of the first signal processing and the second signal processing being performed for each of the wireless resources based on the control information. | 07-14-2011 |
20110249704 | SPREAD CODE ALLOCATING METHOD, DESPREADING METHOD, TRANSMITTING DEVICE, RECEIVING DEVICE, COMMUNICATING DEVICE, WIRELESS BASE STATION DEVICE, AND MOBILE TERMINAL DEVICE - A communication system, including a transmitter that transmits a signal by using a two-dimensional spread code used for making a spread in time and frequency directions and a receiver that receives the signal transmitted from the transmitter, where the transmitter includes a selecting unit that selects spread codes in which at least one of the time and the frequency directions are mutually orthogonal, and a transmitting unit that spreads a signal by using the selected spread codes and transmits the signal, where each of the selected spread codes are able to be split in two or more parts, which are mutually orthogonal with the same parts of other selected spread codes in at least one of the time and the frequency directions. | 10-13-2011 |
20120099458 | TERMINAL APPARATUS, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A terminal apparatus includes a downlink transceiver that receives downlink data via a base station governing a first cell and exchanges with the base station governing the first cell, control information that is for receiving the downlink data; and an uplink transceiver that transmits uplink data via a base station governing a second cell that is different from the first cell and exchanges with the base station governing the second cell, control information that is for transmitting the uplink data. | 04-26-2012 |
20120147837 | RADIO COMMUNICATION METHOD AND A BASE STATION AND USER TERMINAL THEREOF - A user terminal in a radio communication system, in which each of user terminals performs multiplexing of a data signal and a pilot signal and transmits the multiplexed signal to a base station using different data transmission band frequencies that are assigned by the base station, the user terminal includes a receiving unit that receives uplink resource information from a base station. A pilot generation unit that generates a pilot signal based on the uplink resource information and a transmitting unit that transmits the pilot signal generated by the pilot generation unit to the base station where the pilot generation unit includes a sequence generation unit that generates a Zadoff-Chu sequence as a pilot signal based on the uplink resource information and a subcarrier mapping unit that performs mapping of a sequence generated by cyclically copying the Zadoff-Chu sequence. | 06-14-2012 |
20120188986 | WIRELESS COMMUNICATION DEVICE - A mobile station that establishes an uplink wireless connection by transmitting a random access signal through a random access channel after receiving a synchronization channel transmitted from a radio base station in a handover destination, and includes a setting unit for setting a timing of transmitting the random access signal to be later than the timing of receiving the synchronization channel by a prescribed period. | 07-26-2012 |
20120281684 | RADIO COMMUNICATION METHOD AND A BASE STATION AND USER TERMINAL THEREOF - A radio communication method in a radio communication system in which data signals for a first and second user are respectively transmitted using first and second subcarrier groups, and pilot signals for the first and second users are multiplexed using time-division multiplexing with the data signals for those users, including arranging a pilot signal of the first user at frequencies different from frequencies of a pilot signal of the second user and mapping subcarrier components of the pilot signals so that one of subcarrier components of higher frequencies corresponds to one of subcarrier components of lower frequencies, wherein the pilot signals are generated using a Zadoff-Chu sequence. | 11-08-2012 |
20130094465 | RADIO COMMUNICATION METHOD AND A BASE STATION AND USER TERMINAL THEREOF - A radio communication system where a terminal transmits a data signal to a base station using data transmission band frequencies assigned by the base station, and performs time-division multiplexing of a pilot signal with the data signal and transmits the resulting signal to the base station. Including deciding a pilot transmission band for the user terminal covering the data transmission band of the user terminal by frequency offset; and instructing the user terminal to transmit the pilot signal using the decided pilot transmission band. A CAZAC sequence is used as the pilot signal. The instructing includes calculating a frequency offset amount for the user terminal, and a cyclic shift amount of the CAZAC sequence and the frequency offset amount; instructing the user terminal to perform cyclic shift of the CAZAC sequence by the cyclic shift amount, and perform frequency offset of the pilot transmission band by the frequency offset amount. | 04-18-2013 |
20130235831 | RADIO BASE STATION FOR PERFORMING RADIO COMMUNICATION WITH MOBILE STATION - An generation section which generates information indicative of a result of error detection on a downlink signal received, and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel, whereby the generation section and the sending section operate when receiving downlink scheduling information and uplink allocation grant in a same subframe. A receiving section which receives the information via the physical uplink control channel, and an uplink data receiving section which receives the uplink data via the physical uplink shared channel, wherein the receiving section and the uplink data receiving section operate after a predetermined time when sending the downlink scheduling information and the uplink allocation grant in the same subframe. | 09-12-2013 |
20130235832 | RADIO BASE STATION FOR PERFORMING RADIO COMMUNICATION WITH MOBILE STATION - A mobile station for performing radio communication with a radio base station, the mobile station includes an information generation section which generates information indicative of a result of error detection on a downlink signal received; and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel; whereby the information generation section and the sending section operate when the mobile station receives downlink scheduling information and uplink allocation grant in a same subframe. | 09-12-2013 |