摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A base station is connected to a relay station that relays wireless signals from a mobile station. The base station includes a resource block assigning unit configured to generate first resource block assignment information of a first wireless section based on a first propagation quality of the first wireless section between the base station and the relay station; a ratio determining unit configured to calculate a ratio of a number of first resource blocks assigned to the first wireless section and a number of second resource blocks to be assigned to a second wireless section for transmitting the number of first resource blocks in the second wireless section between the relay station and the mobile station; and a transmitting unit configured to transmit the first resource block assignment information and the ratio to the relay station.
摘要:
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.
摘要:
The present invention is a wireless communication system having a mobile station and a wireless base station, wherein the wireless base station further having a scheduling processing unit which divides system bandwidth into a plurality of wireless resource blocks in a frequency domain, performs scheduling so that other channels are not assigned to the wireless resource blocks which are adjacent to a first channel when the first channel whose frequency characteristic is not orthogonal to the other channels is assigned to a certain wireless resource block resulting from the division, and creates scheduling information on the scheduling that is performed; and a transmission unit which transmits the scheduling information created by the scheduling processing unit to the mobile station, and the mobile station transmits a channel signal to the wireless base station on the basis of the scheduling information and the wireless base station receives the channel signal transmitted from the mobile station.
摘要:
A bottom cultivating machine including a laser emitter for emitting a plane signal of a laser beam, a laser detector which is secured to a frame and detects the plane signal to output an attitude control signal, a horizontal detector having a horizontal sensor which is secured to the frame and serves to detect the level of the front end portion of the bottom cultivating machine in a cultivation progress direction, and a controller for controlling the height of the bottom cultivating machine on the basis of the attitude control signal and controlling the attitude of the bottom cultivating machine on the basis of a signal output from the horizontal sensor by upwardly or downwardly moving a gage wheel or a heel which is provided at the rear portion of the bottom cultivating machine.
摘要:
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.
摘要:
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.
摘要:
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.