Abstract: A base station is provided which notifies a mobile station of transmission power information for an uplink RACH, the mobile station transmits transmission delay estimation information on the RACH to the base station over the RACH at a transmission power based on the transmission power information, and the base station changes the transmission power information according to the transmission delay estimation information and notifies the mobile station of the changed transmission power information. The mobile station retransmits data or a preamble if the mobile station does not receive a notification that the base station has received the data or the preamble correctly after a predetermined time. The base station transmits the transmission power information over a BCH and a CPICH transmitted to a plurality of mobile stations.

Abstract: A wireless communication system of the present invention achieves improvement of reliability of communication of control data while suppressing the decrease in the communication throughput of data blocks and/or control data. The wireless communication system of the present invention is provided with a base station (1) and a mobile station (2). The mobile station (2) is configured to transmit a plurality of data blocks to the base station (1) at predetermined transmission time intervals. One of the base and mobile stations is configured to generate a plurality of control data used for control of transmission of said plurality of data blocks, to generate a plurality of control messages from said plurality of control data, and to transmit said plurality of control messages to the other of the base and mobile stations.

Abstract: A mobile station calculates the transmission power of a first physical channel using each of first TFCs, and determines whether the mobile station is in a transmission capable state or not. Then, the mobile station calculates the sum of the transmission power of first and second physical channels, with respect to each of combinations of the first and second TFCs, and determines whether the mobile station is in the transmission capable state or not. Then, the mobile station selects a first TFC from the first TFCs wherein the mobile station is in the transmission capable state. Then, the mobile station selects a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC. Thereafter, data is transmitted using the selected first and second TFCs, respectively.

Abstract: There is provided a radio communication method capable of reducing inter-cell interference. In a radio communication system in which each of a plurality of base stations performs radio communication with a mobile station by using one of frequency blocks, the base stations transmit pilot signals using frequency blocks and the mobile station measures the reception quality of the pilot signals of the first base station, measures the reception quality of the pilot signals transmitted by the second base station, generates channel quality information for the frequency block according to the reception quality of the pilot signal of the first base station and the reception quality of the pilot signal of the second base station, and transmits the channel quality information to the first base station.

Abstract: A larger cell uses a pilot pattern with a higher pilot density in a frequency axis direction to improve a channel estimation accuracy when a frequency selective fading variation is large. Meanwhile, a smaller cell uses a pilot pattern with a lower pilot density in the frequency axis direction. A pilot pattern that each base station uses is transmitted to a mobile station in a cell as a report signal.

Abstract: A base station is provided which notifies a mobile station of transmission power information for an uplink RACH, the mobile station transmits transmission delay estimation information on the RACH to the base station over the RACH at a transmission power based on the transmission power information, and the base station changes the transmission power information according to the transmission delay estimation information and notifies the mobile station of the changed transmission power information. The mobile station retransmits data or a preamble if the mobile station does not receive a notification that the base station has received the data or the preamble correctly after a predetermined time. The base station transmits the transmission power information over a BCH and a CPICH transmitted to a plurality of mobile stations.

Abstract: A wireless communication system of the present invention achieves improvement of reliability of communication of control data while suppressing the decrease in the communication throughput of data blocks and/or control data. The wireless communication system of the present invention is provided with a base station (1) and a mobile station (2). The mobile station (2) is configured to transmit a plurality of data blocks to the base station (1) at predetermined transmission time intervals. One of the base and mobile stations is configured to generate a plurality of control data used for control of transmission of said plurality of data blocks, to generate a plurality of control messages from said plurality of control data, and to transmit said plurality of control messages to the other of the base and mobile stations.

Abstract: A mobile station calculates the transmission power of a first physical channel using each of first TFCs, and determines whether the mobile station is in a transmission capable state or not. Then, the mobile station calculates the sum of the transmission power of first and second physical channels, with respect to each of combinations of the first and second TFCs, and determines whether the mobile station is in the transmission capable state or not. Then, the mobile station selects a first TFC from the first TFCs wherein the mobile station is in the transmission capable state. Then, the mobile station selects a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC. Thereafter, data is transmitted using the selected first and second TFCs, respectively.

Abstract: A transmission power control method that reduces the possibility of going out of synchronization is presented. In a reduced power mode, a target SIR is set equal to or higher than SIR_reduced where deemed appropriate, whereby frequent issues of Out-of-sync and the probability of generation of RL_Failure are suppressed. To raise a reception SIR to a value equal to or higher than SIR_reduced, the target SIR may be periodically set at SIR_temp that is a value equal to or higher than SIR_reduced. Alternatively, when brought in the reduced power mode, a mobile station itself may periodically set its transmission power such that a value equal to or higher than SIR_reduced can be achieved.

Abstract: A code sequence transmission method capable of improving system throughput and user throughput by improving power utilization efficiencies of a control channel and a data channel including a plurality of signals having different required qualities is provided. In a mobile station, a bit sequence of a TFCI is transmitted within one frame a plurality of times repeatedly, the bit sequence of each TFCI is multiplied by one bit of a bit sequence of an SI, a multiplication result is transmitted. It is thereby possible to transmit both the TFCI and the SI without providing a signal field of the SI in each frame.

Abstract: In a method of selecting a transport format combination according to the present invention, a mobile station calculates the transmission power of a first physical channel using a first TFC with respect to each of first TFCs, and determines whether the mobile station is in a transmission capable state or not. Then, the mobile station calculates the sum of the transmission power of first and second physical channels using first and TFCs, with respect to each of combinations of the first and second TFCs, and determines whether the mobile station is in the transmission capable state or not. Then, the mobile station selects a first TFC from the first TFCs wherein the mobile station is in the transmission capable state. Then, the mobile station selects a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC.

Abstract: There is provided a wireless communication system which can synchronize a mobile station with a destination base station in response to the mobile station determining to switch base stations. Each base station generates synchronization information to synchronize the mobile station with the base station from a reverse pilot signal received from the mobile station, generates reverse propagation quality information from the reverse pilot signal, and generates and transmits a control signal including the synchronization information and the reverse propagation quality information. A mobile station generates and transmits a reverse pilot signal, receives a signal including the control signal from each of the base stations.

Abstract: A cellular system comprises a mobile station and a base station. The mobile station includes a means for transmitting a pilot signal synchronized with data transmission and a means for transmitting a pilot signal not synchronized with data transmission. The base station includes a means for measuring an interference power based on the received power of the field of the pilot signal synchronized with data transmission, a means for measuring a desired wave power based on the received power of the field of the pilot signal not synchronized with data transmission, and a means for estimating the channel quality of the mobile station based on the interference power and the desired wave power.

Abstract: There is provided a wireless communication system which can synchronize a mobile station with a destination base station in response to the mobile station determining to switch base stations. Each base station generates synchronization information to synchronize the mobile station with the base station from a reverse pilot signal received from the mobile station, generates reverse propagation quality information from the reverse pilot signal, and generates and transmits a control signal including the synchronization information and the reverse propagation quality information. A mobile station generates and transmits a reverse pilot signal, receives a signal including the control signal from each of the base stations.

Abstract: In a method of allocating carriers of a cellular system comprising mobile stations and a wireless network of multiple base stations, multiple carriers being available for communication between base and mobile stations, the wireless network performs the following. Carriers are divided into first and second carriers, and allocated the same for each cell formed by the base stations. Each mobile station is classified as an intracell-inner-area or an intracell-outer-area mobile station. Communication is performed with the intracell-inner-area and intracell-outer-area mobile stations by the first and second carriers, respectively. A status of use of the first carriers in a first cell is measured based on communicated data, as is that of the second carriers in a second cell. The number of second carriers in the second cell is changed based on at least the status of use of the first carriers and the status of use of the second carriers.

Abstract: A larger cell uses a pilot pattern with a higher pilot density in a frequency axis direction to improve a channel estimation accuracy when a frequency selective fading variation is large. Meanwhile, a smaller cell uses a pilot pattern with a lower pilot density in the frequency axis direction. A pilot pattern that each base station uses is transmitted to a mobile station in a cell as a report signal.

Abstract: In a transmission power control method for a base station in a communication system including at least a mobile station and at least one base station, the ratio of transmission power approaching a predetermined reference power is changed between a communication having a slot not transmitting a signal and a communication having no slot not transmitting a signal. Thus, in the transmission power control, it is possible to prevent the downstream transmission power from being too much alienated from a desired transmission power.

Abstract: A radio communication method is provided for reducing the overhead of radio resources (transmission power, transmission time, frequency band) caused by the transmission of a control signal to a mobile station in a poor propagation environment and thus enabling an improvement of throughput of the entire system. A base station (101) and mobile stations (111 and 112) are connected to allow communication by way of radio links in which a control channel and data channel can be set on each of downlinks and uplinks. The base station (101) uses the control channel to transmit a control signal to the mobile stations (111 and 112). The mobile stations (111 and 112), based on the control signal received from the base station (101), use a data channel to transmit or receive data. The base station (101) alters the amount of information of the control signal in accordance with communication conditions of the propagation paths of the radio links formed with the mobile stations (111 and 112).

Abstract: In a pilot signal transmission method for raising the SIR measurement accuracy for transmission power control during high-speed transmission and thus reducing the block error rate and improving the throughput, a first SIR value measured by first pilot signals and second SIR value measured by second pilot signals are first compared, and the presence or absence of second pilot signals then determined in slot units based on the comparison results. When the second pilot signals exist, the second pilot signals are used in addition to the first pilot signals in the SIR measurement for high-speed closed-loop transmission power control. When the second pilot signals do not exist, only the first pilot signals are used in the SIR measurement for high-speed closed-loop transmission power control.

Abstract: In a method of selecting a transport format combination according to the present invention, a mobile station calculates the transmission power of a first physical channel using a first TFC with respect to each of first TFCs, and determines whether the mobile station is in a transmission capable state or not. Then, the mobile station calculates the sum of the transmission power of first and second physical channels using first and TFCs, with respect to each of combinations of the first and second TFCs, and determines whether the mobile station is in the transmission capable state or not. Then, the mobile station selects a first TFC from the first TFCs wherein the mobile station is in the transmission capable state. Then, the mobile station selects a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC.