Abstract:
Provided is a wireless communication device which can transmit an emergency signal without deteriorating data transmission efficiency. In the device, a modulating section (105) performs modulation processing to an emergency signal and generates an emergency signal symbol, an arranging section (106) arranges the emergency signal symbol at a frequency of a guard carrier wherein a normal signal is not arranged, a diffusion section (107) performs diffusion processing to the emergency signal symbol by using an emergency signal diffusion code, and a wireless transmission section (108) performs transmission processing to the diffused emergency signal symbol and transmits the symbol from an antenna (109).
Abstract:
A radio transmitting apparatus and a radio transmitting method wherein the loss of transmission efficiency is suppressed to improve the reception quality of pilots received by a receiver apparatus. In the present apparatus and method, in a case of transmitting a pilot block at one of two transmission antennas, the areas of data blocks placed immediately before and after the pilot block are reduced, and the CP of the pilot block is expanded by the amount of that reduction. On the other hand, it is arranged that the interval of transmitting the expanded CP and pilot block be an interval of halting the transmission at the other transmission antenna.
Abstract:
A radio transmitting apparatus and a radio transmitting method wherein a guard interval having a variable length is used to allow a radio receiving apparatus to precisely and easily obtain a symbol synchronization. In the radio transmitting apparatus, a GI adding part (103) adds a short GI or a long GI, which is longer than the short GI, to the head of each of data parts into which a modulated signal outputted from a modulating part (102) has been put by a predetermined number of symbols. In a case of adding the short GI, the GI adding part (103) copies the symbols of a portion of the data part including the rear thereof, and adds the copied symbols to the head of that data part, thereby providing a GI. In a case of adding the long GI, the GI adding part (103) copies the symbols of a portion of a second data part, which immediately follows the first data part, including the rear of the second data part. Then, the GI adding part (103) adds the copied symbols to the head of the first data part, thereby providing the second GI. Moreover, the GI adding part (103) copies the symbols of a portion of the first data part including the rear thereof, and then adds the copied symbols to the head of the second GI added to the first data part, thereby providing the first GI.
Abstract:
Provided is a resource allocation method capable of improving a reception quality when connecting a plurality of sub frames into one frame and performing a communication process for each of the frames. In this method, when a sub frame #1 is transmitted, LRB is selected as a resource allocation format according to CQI fed back from a mobile station and RB having a preferable propagation quality is allocated for transmission data according to the LRB format. When a sub frame #2 is transmitted, the same resource allocation method (LRB) as the head sub frame is used and the transmission data is allocated for the same RB. When a sub frame #3 is transmitted, the resource allocation method is switched from the sub frame #1 and the sub frame #2 and the transmission data is allocated for RB by using the DRB format.
Abstract:
Provided is a mobile station device capable of performing RACH transmission with a small amount of resources. In this device, a RACH generating unit (111) is formed by a signature selection unit (112) and a modulation unit (113). A RACH signal is generated as follows. That is, according to inputted RACH re-transmission quantity information, the signature selection unit (112) selects one code sequence as a signature from a plurality of different code sequences. The modulation unit (113) modulates the signature (code sequence) and generates a RACH signal. A multiplexing unit (116) time-multiplexes the RACH signal inputted from the modulation unit (113) and user data inputted from the modulation unit (115). A radio transmission unit (117) subjects the multiplexed signal to radio processing and transmits it via an antenna (121).
Abstract:
A mobile communication system which is capable of, when carrying out mobile communication using a shared channel, increasing in efficiency of transmission timing of the data transmission rate request value to prevent wasteful power consumption and hence reduce power consumption. The mobile station apparatus of the mobile communication system measures CIR of the received signal from the base station apparatus at the CIR measuring section, and decides the data transmission rate request value corresponding to the measured CIR value at the rate request value deciding section. Also, it detects an error of the received signal at the CRC section, and, when no error is found, calculates a difference between the average data transmission rate from the base station apparatus and the data transmission request value at the rate request value transmission controlling section. Then, it transmits the data transmission rate request value to the base station apparatus only when the obtained difference is larger than a threshold value.
Abstract:
Data streams stored in buffers (101) are modulated by modulation sections (102). Multipliers (103) multiply the signals output from the modulation sections (102) by weights output from a weight control section (112). The signals output from the multipliers (103) are added up by addition sections (104), subjected to radio transmission processing by transmission radio sections (105) and sent through antennas (106). A buffer control section (111) controls the buffers (101) based on a retransmission count output from a retransmission count detection section (110). The weight control section (112) outputs weights different from weights at the time of previous transmission to the multipliers (103) every time data is retransmitted. This allows a diversity gain at the time of data retransmission to be increased even if a time variation of the propagation path environment for radio signals is slow.
Abstract:
A transmitting apparatus and a transmitting method wherein the systematic bit reception quality can be improved and the throughput performance can be improved. An IR parameter control part (101) controls, based on the number of retransmissions, the ratio of systematic bits to parity bits in mapping them to packets, and controls to map a parity bit to an initially transmitted packet, while mapping a systematic bit to a retransmitted packet. An encoding part (102) generates the systematic bits and parity bits and maps them to the packets in accordance with the IR parameters. A transmission power calculating part (105) calculates, based on reception quality information of the initially transmitted packet fed back from a receiving end, the transmission power of the transmitted packet to which the systematic bit is mapped. A transmission power control part (106) controls the transmission power of the retransmitted packet such that it is equal to the transmission power as calculated by the transmission power calculating part (105).
Abstract:
There is provided a wireless transmitting device, the reception quality of which can be improved by effectively using the cyclic prefix. In the wireless transmitting device, a data mapping determination unit (204) determines a data mapping method according to tmax information, and a data mapping unit (207) performs data mapping on the signals outputted from modulation units (205, 206) according to the data mapping method determined by the data mapping determination unit (204). The data mapping determination unit (204) acquires the tmax information transmitted from a communication party and determines to map important information, such as of a control channel, a systematic bit, a resending bit, ACK/NACK information (ACK or NACK), a CQI (Channel Quality Indicator), a TFCI (Transport Format Combination Indicator), information necessary for modulation, a pilot, a power control bit, etc., on the data from its tail end to the portion corresponding to (TGI-tmax).
Abstract:
Provided is a radio communication base station device capable of acquiring both a multi-user diversity effect and a frequency diversity effect simultaneously in multi-carrier communications. In this devices modulation units (101-1 to 101-n) modulate data to mobile stations (MS#1 to MS#n) individually to create data symbols. A separation unit (102) separates each data symbol inputted, into an Ich (in-phase components) and a Qch (orthogonal components). An Ich arrangement unit (103) and a Qch arrangement unit (104) arrange the Ich and Qch, respectively, in a plurality of sub-carriers constituting an OFDM symbols, and output the same to a synthesization unit (105). This synthesization unit (105) synthesizes the Ich and Qch arranged for each sub-carrier, to create the synthesized symbol.