摘要:
A wireless communication system enabling multihop communication while maintaining the system throughput and preventing degradation of the user throughput. In the system, a BS (base station) determines the relaying method (whether an RS performs reproduction relay or nonreproduction relay) of the RS (relaying station) and the MCS of multihop communication according to the reception quality (the line quality among an MS2, the RS, and the BS) of the pilot for nonreproduction relay, the reception quality (the line quality between the RS and the BS) of the pilot 2 for reproduction relay, and the line quality (the line quality between the MS2 and the RS) measured at the RS. The determination result is transmitted as relay information to the RS and to the MS2 (a mobile station (2)) through the RS. The MS2 encodes and modulates the uplink data with the MCS based on the relay information and transmits the data to the RS. The RS relays the uplink data while selecting nonreproduction relay or reproduction relay according to the relay information.
摘要:
Provided is a base station device capable of reducing a DL-CSI feedback amount in a TDD type radio communication system in which a DL bandwidth is different from a UL bandwidth. In this device, a demultiplexing unit (133) separates an UL pilot, a DL-CQI, and a DL-CSI fed back from a plurality of UEs as communication partners; a channel estimation unit (134) performs channel sounding by using a UL pilot from a UE in which a DL channel and a UL channel are allocated by overlapping a part of the bandwidth so as to obtain UL-CSI; a control DL-CSI acquisition unit (135) performs interpolation of DL-CSI by using the DL-CSI of some RB contained in the bandwidth where the DL channel and the UL channel fed back from the UE are not overlapped; and a DL close loop control unit (104) combines the estimated UL-CSI and the interpolated DL-CSI so as to use them as DL-CSI for controlling the DL close loop.
摘要:
It is possible to provide a transmission control method, a radio communication system, and a radio base station device which can reduce the time required until an inter-cell interference is reduced so as to improve the system throughput. A base station (200) includes: an FFT unit (210) which receives an interference report transmitted by using a common radio resource common to adjacent cells from a plurality of radio terminals (100) existing in different adjacent cells; and an adaptive FFR processing unit (230) which controls adaptive FFR processing in a downstream line of the local cell according to the reception interference report. Thus, by receiving an interference report directly from the radio terminals (100) existing in adjacent cells, it is possible to modify the transmission mode by considering the interference state in the adjacent cells. This eliminates the need of sending a report on a transmission mode modification which has been conventionally sent between adjacent base stations (200). This reduces the signaling required in the system, which improves the system throughput.
摘要:
A wireless communication system enabling multihop communication while maintaining the system throughput and preventing degradation of the user throughput. In the system, a BS (base station) determines the relaying method (whether an RS performs reproduction relay or nonreproduction relay) of the RS (relaying station) and the MCS of multihop communication according to the reception quality (the line quality among an MS2, the RS, and the BS) of the pilot for nonreproduction relay, the reception quality (the line quality between the RS and the BS) of the pilot 2 for reproduction relay, and the line quality (the line quality between the MS2 and the RS) measured at the RS. The determination result is transmitted as relay information to the RS and to the MS2 (a mobile station (2)) through the RS. The MS2 encodes and modulates the uplink data with the MCS based on the relay information and transmits the data to the RS. The RS relays the uplink data while selecting nonreproduction relay or reproduction relay according to the relay information.
摘要:
[Problems to be Solved]Provide is a saccharified-solution manufacturing method and a saccharified-solution manufacturing device, which increases the amount of sugar yielded as a saccharified-solution, when lignocellulose-based biomass is subjected to saccharifying enzyme treatment.[Solution]A substrate and ammonia water are mixed at a predetermined mass ratio to yield a substrate mixture, the mixture is retained at a predetermined temperature for a predetermined time period for dissociating lignin from the substrate or swelling the substrate to yield a pretreated ammonia-containing product for saccharification. To a pretreated product for saccharification, which is yielded by separating ammonia from the pretreated ammonia-containing product for saccharification, an acid is added for pH adjustment, and also a saccharifying enzyme is added to yield a substrate/saccharifying enzyme mixture liquid containing a substrate of 15 to 30% by mass. The substrate/saccharifying enzyme mixture liquid is saccharified enzymatically to yield a saccharified-solution.
摘要:
A wireless transmission method for improving the reception characteristic of a preamble. The wireless transmission method allows the patterns of subcarriers (transmitting antenna Tx1: 1, 2, 3, 5, 6, 7, 8, . . . , transmitting antenna Tx2: 4, 9, 10, 12, 13, 14, . . . ) in which preamble sequences are continuously arranged to be changed in a frequency direction. With this, the preamble sequences can be arranged at random subcarrier intervals and, when the autocorrelation values of the preamble sequences are obtained in a time domain, the peak value of the sidelobe becomes small, thereby making it possible to prevent a timing detection error.
摘要:
A radio transmitting apparatus and the like for improving the reception error rate characteristic. In this apparatus, a data modulating part (121) modulates a data signal to provide a modulated symbol. A Q-inverting part (125) generates a symbol that corresponds to the modulated symbol provided by the data modulating part (121) and that, when combined with the modulated symbol, becomes a signal having a particular value. A multiplexing part (110) multiplexes the modulated symbol provided by the data modulating part (121) with the corresponding symbol generated by the Q-inverting part (125) to provide a multiplexed signal.
摘要:
A wireless communication system enabling multihop communication while maintaining the system throughput and preventing degradation of the user throughput. In the system, a BS (base station) determines the relaying method (whether an RS performs reproduction relay or nonreproduction relay) of the RS (relaying station) and the MCS of multihop communication according to the reception quality (the line quality among an MS2, the RS, and the BS) of the pilot for nonreproduction relay, the reception quality (the line quality between the RS and the BS) of the pilot 2 for reproduction relay, and the line quality (the line quality between the MS2 and the RS) measured at the RS. The determination result is transmitted as relay information to the RS and to the MS2 (a mobile station (2)) through the RS. The MS2 encodes and modulates the uplink data with the MCS based on the relay information and transmits the data to the RS. The RS relays the uplink data while selecting nonreproduction relay or reproduction relay according to the relay information.
摘要:
Provided is a relay station capable of reducing control information required for allocating a relay transmission channel in a mobile communication system. The relay station (100) includes: a demodulation unit (103) and a decoding unit (104) for demodulating and decoding a signal from a mobile station and channel allocation information from a base station; an extraction unit (105) for extracting a signal from the mobile station from signals inputted from the decoding unit (104) so as to output it to a coding unit (107) and extracting channel allocation information from the base station so as to output it to a channel setting unit (106); the channel setting unit (106) for setting a channel transmission channel according to a channel allocation rule shared by the relay station (100) and the base station; the coding unit (107) and a modulation unit (108) for encoding and modulating the signal from the mobile station; and a channel allocation unit (109) for allocating the modulated signal to one of the relay transmission channels.
摘要:
An interleave apparatus and an interleave method for preventing an increase in the number of retransmissions to improve the throughput. In a wireless communication apparatus having the interleave apparatus, a data holding part (1021) two-dimensionally arranges and holds bit sequences. A first index calculating part (1022) sequentially calculates first indexes to be used for reading, in a column direction, the bit sequences arranged in a row direction. A second index calculating part (1023) sequentially calculates second indexes to be used for reversing the order of the upper-order and lower-order bits to be read from the even-numbered columns when the bit sequences are read in accordance with the first indexes. A third index calculating part (1024) sequentially calculates third indexes to be used for reading the bit sequences from a different start position in accordance with the number of retransmissions. A reading part (1025) reads the bit sequences in the order that is in accordance with the third indexes. A mapping part (103) maps the read bit sequences to the respectively corresponding subcarriers.