摘要:
A communication system includes: a base station; and a mobile terminal for sequentially sending a plurality of data packets at a designated data transfer rate and information of velocity of the mobile terminal to the base station; the base station including: a receiver for receiving the data packet and the velocity information; a transmitter for transmitting a request to the mobile terminal to resend a data packet upon detection of an error in the data packet previously received; and a reply controller for setting number of requests to be repetitively sent in accordance with the velocity information and, after the number of requests have been sent, sending command to change the designated data transfer rate to the mobile terminal.
摘要:
A method for controlling radio communication such as mobile phone communication is provided for preventing an endless loop of a request for retransmission that is issued by a device on a reception side to a device on a transmission side. The transmission device performs processes of counting, for each RLC-PDU, the number of times when a request for retransmission is issued by the reception device (#524), and transmitting control information indicating that a process of receiving the RLC-PDU should be skipped to the reception device when the number of times of the request for retransmission of the RLC-PDU reaches a threshold value (#528).
摘要:
A searching method and system of position information search position information through the medium of image data of an identification mark attached to construction products such as a post box, a telephone booth and a utility pole, and a tree. Image data of the identification mark on an object is acquired by using a mobile terminal device or the like and an identification code is read from this image data and notified. Position information is searched by this identification code, and this position information is notified to the mobile terminal device or the like.
摘要:
Instead of adding control information that should be passed on to two or more RLC entities or two or more PDCP entities on the counterpart side to data respectively in two or more RLC entities or two or more PDCP entities at the sending end, control information is added in MAC entity and then distributed to two or more RLC entities in MAC entity on the counterpart side.
摘要:
In a wireless telecommunication system employing a time division multiple access (TDMA) system, a scheduler of a base station determines an allocation of a first frame and a second frame for a first data set to be transmitted to a terminal and a second data set to be transmitted thereto after the first data set. A generation unit generates scheduling information for notifying the terminal of the timing of transmitting the second data set on the basis of a relative number of frames for indicating the number of second frames relative to that of the first frame. An addition unit adds scheduling information generated by the generation unit to a control channel corresponding to the first data set and sends the result to the terminal.
摘要:
A system for controlling an image display which enables the efficiency of transfer of image data to be greatly improved when a control processor and display control unit access an image memory at alternate timings, the control processor updates the image data, and the display control unit displays the image data on a display, wherein the control processor is first made to wait so that the relative deviation in phase between the operational cycle (T1 to T4) of the control processor and the alternate access cycle of the control processor and display control unit specified by the display control unit is initially set to a certain relative relationship so that the two accesses do not conflict, then the image data is transferred without waiting.
摘要:
A relay and exchange system includes a plurality of exchanges for relaying and exchanging transmission information contained in frames each composed of m bits, and are so constructed as to form a tandem connection by a plurality of transmission lines. A pair of multiplexing apparatuses is provided at both ends of each transmission line. On each transmission line, frames each composed of n (n
摘要:
Instead of adding control information that should be passed on to two or more RLC entities or two or more PDCP entities on the counterpart side to data respectively in two or more RLC entities or two or more PDCP entities at the sending end, control information is added in MAC entity and then distributed to two or more RLC entities in MAC entity on the counterpart side.
摘要:
A method for counting correctly substantial transmission times of a data unit such as an RLC-PDU even if the data unit is divided before being transmitted is provided. The method includes the steps of preparing a counter for the RLC-PDU (#503), making a storage portion store a pointer indicating a position of a division PDU of the RLC-PDU to be transmitted every time when the division PDU obtained by dividing the RLC-PDU is transmitted (#504), determining whether or not the transmission times should be counted along with a transmission of the division PDU to be transmitted based on the pointer of the division PDU to be transmitted and the pointer of a division PDU that was transmitted last time (#505, #506 and #507), and making the counter perform the count process when it is determined that the transmission times should be counted (#508).
摘要:
A wireless communication apparatus that uses a communication protocol to transmit and receive data with a data check bit, including a received data determining section that performs a data check for received data by using the data check bit to determine whether the data is error; a received result transmitting section that, when determined to be error, discards the data and transmits a retransmission request to other wireless communication apparatus of the transmitting origin, whereas determined to be not error, transmits a message indicating that the data is normal to the other wireless communication apparatus of the transmitting origin; and a retransmission asking section that determines whether a format of the data is incorrect or normal, and when determined to be normal, passes the data to predetermined processing, whereas when determined to be incorrect, discards the data and asks the received result transmitting section to request retransmission of the data.