Abstract: There are provided a base station device and a mobile station device for increasing the speed of cell search by introducing identification of TTI timing into the cell search. In the base station device (100), a frame configuration unit (120) forms a frame by arranging a TTI synchronization sequence (SCH1 sequence) used for identifying the frame timing and a TTI synchronization sequence (SCH2 sequence) used for identifying the TTI timing in such a manner that they are not superimposed on the same symbol specified by the frequency and the time. A radio transmission unit (145) sends the frame. The frame configuration unit (120) arranges the frame synchronization sequence at a predetermined position from the frame starting symbol and the TTI synchronization sequence at a predetermined position from the TTI starting symbol. The mobile station device (200) receiving the frame detects the TTI timing by using the TTI synchronization sequence.

Abstract: A wireless transmission apparatus that improves throughput in a wireless communication network system. In this apparatus, MT units of transmission/reception sections (122-1 to 122-MT) respectively correspond to MT units of antennas (121-1 to 121-MT) and transmit a preamble signal and a data signal via corresponding antennas (121-1 to 121-MT). MT units of transmission/reception sections (122-1 to 122-MT) use subcarriers allocated per antennas (121-1 to 121-MT) out of subcarriers (141, 142, 143 and 144) in preamble signal transmission. Furthermore, MT units of transmission/reception section (122-1 to 122-MT) use a subcarrier (140) having a frequency different from subcarriers (141, 142, 143 and 144) in data signal transmission.

Abstract: A scalable bandwidth system wherein even if a terminal does not know the breakdowns of the services in all of the bandwidths, it can perform a correlation processing of synchronous channels (SCH). A base station repetitively transmits a synchronous channel, by unit of the shortest bandwidth (e.g., 1.25 MHz) of a plurality of bandwidths served by the system, over the whole band of the longest bandwidth (e.g., 5 MHz). The terminal calculates the correlation between a synchronous channel sequence signal of the unit of the shortest bandwidth held in advance and the repetitively transmitted synchronous channel, and determines, as a frame timing, a timing at which the maximum correlation value is obtained.

Abstract: There are provided a base station device transmitting a frame capable of performing cell search without being affected by arrangement of a pilot channel and a mobile station device performing cell search by using the frame. In the base station device (100), a frame formation unit (120) forms a frame by arranging a P-SCH sequence used for synchronization of a frame timing on some symbols of multi-carrier symbols at a predetermined position from the frame head in the frequency direction and arranging an S-SCH sequence corresponding to a base station scrambling code so that it is not overlapped on some of the multi-carrier symbols at a predetermined position from the frame head with the same symbol as the frame synchronization sequence. The frame is received by the mobile station device (200) and the S-SCH is demodulated. Thus, it is possible to directly identify the base station scrambling code without using a pilot channel.

Abstract: 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.

Abstract: Even when terminals having different bandwidths require different amounts of BCH information, a radio base station apparatus in a scalable bandwidth system can transmit the BCH information required by the terminals. A base station (100) comprises a frame generating part (150) that generates a frame in which only common information directed to all of the terminals is placed in a band, which is assigned within a band having the largest one of the bandwidths supported by the base station (100) and has the smallest one of the supported bandwidths, and in which additional information different from the common information is placed in a band which is located within the band having the largest supported bandwidth and which is different from the band in which the common information is placed; and an RF transmitting part (180) that transmits the frame via a broad channel.

Abstract: Provided are a base station device and a mobile station device, which can lighten a cell-search processing. The base station device (100) includes a frame constitution unit (130) for forming a frame, in which a pilot symbol multiplied by a base station scrambling code assigned to that device and a plurality of sequences contained in the corresponding sequence set is arranged in at least the head or tail, and a radio transmission unit (155) for sending the formed frame. On the receiving side of the frame, the frame timing can be detected from the position of a pilot symbol contained in that frame. Since the base station scrambling code and the sequence set containing the sequences are made to correspond to each other, candidates can be narrowed to at most the base station scrambling codes of the number of the combinations of the sequences contained in the sequence set, by detecting the sequences multiplied by the pilot symbol, so that the cell search processing can be lightened.

Abstract: A base station apparatus that transmits frames in accordance with a communication format, and a mobile station apparatus that uses the frames to determine the communication format of the base station apparatus, and then performs an adaptive cell search in accordance with the determined communication format. The base station apparatus (100) comprises a plurality of antennas; a transmitting part (150) that transmits frames via the antennas; and a frame forming part (130) that forms, in accordance with the number of antennas to be used for the transmission, frames in which different synchronization sequences (SCH sequences) are arranged.

Abstract: A base station, a mobile station and a retransmission control method for enabling communication to be more efficiently performed. In a communication system comprising a base station (100) and a mobile station (200), a time period required for the retransmission of a transport packet to complete is determined, and a retransmission control is performed, based on the required time period, to change the order of executing the retransmission of the transport packet and a handover. In this way, when it is estimated that the retransmission will complete soon, the retransmission is caused to complete in a handover source system, thereby avoiding waste of communication resources used in the preceding transmission and retransmission processes.

Abstract: A communication apparatus exhibiting improved certainty and stability in communication. In a wireless terminal (100) serving as the communication apparatus, a transmission possibility determining part (186) uses an AIFS and a backoff value to control the transmission timing of transport data, and an AIFS managing part (181) adjusts the AIFS value related to the transport data in accordance with an elapsed time from the occurrence of a transmission request of the transport data. In this way, the AIFS value related to any transport data having a long elapsed time from the occurrence of a transmission request of the transport data can be reduced, and a predetermined wait time determined by the AIFS and backoff values also can be reduced. Accordingly, the probability of the transport data being transmitted with a higher priority than the other ones can be raised, whereby the possibility of the transport data being abandoned because of a timeout can be reduced.

Abstract: A wireless communication apparatus capable of effectively controlling retransmission. In this wireless communication apparatus (100), a frame aggregation part (111) aggregates basic unit data units (e.g., MPDUs) and adds a header thereto to form an aggregated frame. In response to a retransmission request from a receiving station (wireless communication apparatus (200)) as to the aggregated frame, a frame dividing part (112) divides the data part of the aggregated frame into segmented data blocks to form segmented frames. A frame control part (170) classifies the segmented frames into some groups in accordance with the reception qualities, at the receiving station, of the segmented data blocks of the aggregated frame. A transmission control part (185) transmits only the segmented frames of a group the reception quality of which is below a predetermined level.

Abstract: A despreading and RAKE combining section despreads a data portion using all spreading codes and RAKE combines the despread signal. An average value calculating section calculates RAKE output average power values of all spreading codes from the RAKE combining result. A threshold setting section sets a threshold value based on the RAKE output average values of the plurality of spreading codes allocated to the own station. A spreading code determining section performs threshold determination between a RAKE output average value obtained from the spreading codes, excepting the spreading codes allocated to the own station, and determines the spreading code, which corresponds to the RAKE output average value exceeding the threshold value, as the spreading code multiplexed into the received signal. This makes it possible to accurately estimate the spreading codes multiplexed into the received signal.

Abstract: The invention includes methods for achieving efficient channel access in a wireless communications system. The invention is embodied in a wireless network adapter that is present in all stations belonging to the network. The invention describes methods by which access overheads may be reduced by introducing the concept of context sensitive frame timing—using which stations redefine and interpret frame timing depending on context and signaling. The result of realizing the invention is an improvement in medium utilization efficiency and consequently, an overall improvement in network throughput.

Abstract: A wireless transmission apparatus that improves throughput in a wireless communication network system. In this apparatus, MT units of transmission/reception sections (122-1 to 122-MT) respectively correspond to MT units of antennas (121-1 to 121-MT) and transmit a preamble signal and a data signal via corresponding antennas (121-1 to 121-MT). MT units of transmission/reception sections (122-1 to 122-MT) use subcarriers allocated per antennas (121-1 to 121-MT) out of subcarriers (141, 142, 143 and 144) in preamble signal transmission. Furthermore, MT units of transmission/reception section (122-1 to 122-MT) use a subcarrier (140) having a frequency different from subcarriers (141, 142, 143 and 144) in data signal transmission.

Abstract: In order to appropriately control transmit power of a common channel for an MBMS (Multimedia Broadcast/Multicast Service) so as not to become excessive, a mobile station 1 transmits a TPC command for an S-CCPCH to a base station through an uplink DPCH1 and a mobile station 2 transmits a TPC command for an S-CCPCH to the base station through an uplink DPCH2. When either one of the TPC command for the S-CCPCH transmitted from the mobile station 1 and the TPC command for the S-CCPCH transmitted from the mobile station 2 is a TPC command instructing “Up”, the base station increases transmit power of the downlink S-CCPCH and decreases transmit power of the downlink S-CCPCH when both TPC commands instruct “Down”.

Abstract: An adjacent sample comparison processing section 201 compares power values between adjacent samples of a delay profile created based on an oversampled received signal and detects whether the power value is increasing or decreasing. A comparison result storage processing section 204 adds 1 when information on an increase/decrease in power values between the adjacent samples remains the same as information in the previous time or resets the information and newly sets 1 when the information is different from the information in the previous time. A slope decision processing section 205 controls a path selection section 207 when the count number of the comparison result storage processing section 204 becomes the same as an oversampling number so as to select the corresponding sample as a path. The path selection section 207 selects the sample having a peak value as a path candidate and also selects the sample instructed from the slope decision processing section 205 as a path.

Abstract: A radio communication method is provided that enables the TFC pointer of a communication terminal apparatus to be made to match the TFC pointer of a radio base station apparatus. A mobile station changes its TFC pointer in line with a determined TFC and also transmits a TFCI at point in time t3. The base station checks the TFCI and updates its own TFC pointer so as to match with the TFC indicated by the TFCI. The base station determines a new TFC pointer, generates an up/down/keep signal by comparing the new TFC pointer with the updated TFC pointer, and transmits this signal at point in time t5. The mobile station updates the TFC pointer it is holding based on the up/down/keep signal received at point in time t6. As a result, the TFC pointers of both stations can be made to match even if the mobile station receives an up/down/keep signal erroneously at point in time t2.

Abstract: The radio reception section 1102 receives a received signal whose band has been restricted using a filter. The delay profile creation section 1104 creates continuous delay profiles for every midamble shift. The distortion component creation section 1106 creates start path distortion components by multiplying the power value of the start sample of each midamble shift by a coefficient of the filter. The removing section 1107 removes the start path distortion components of the following midamble shift from predetermined samples behind the delay profile of each midamble shift. The path selection section 1108 selects samples whose power value is equal to or greater than a threshold as paths from the delay profile with the start path distortion components removed as paths.

Abstract: It is determined whether a secondary spreading code is multiplexed based on a result obtained by despreading a data portion of a received signal using a primary spreading code corresponding to a midamble shift included in a received signal and a result obtained by despreading the data portion using the secondary spreading code corresponding to the primary spreading code. Moreover, among the spreading codes corresponding to the midamble shifts used in the own station, when the number of the midamble shifts allocated to the own station is multiple, the delay profiles generated by the midamble shifts used in the own station are normalized to power per spreading code and a threshold value for a midamble shift determination is set using the normalized delay profiles. This makes it possible to specify all spreading codes multiplexed into the received signal and improve accuracy in the midamble shift determination even when the number of spreading codes corresponding to the midamble shifts is multiple.

Abstract: A despreading and RAKE combining section 107 despreads a data portion using all spreading codes and RAKE combines the despread signal, and an average value calculating section 108 calculates average power values (RAKE output average values) of all spreading codes from the RAKE combining result. A threshold setting section 110 uses a minimum value of the RAK output average values by the plurality of spreading codes allocated to the own station as a threshold setting reference value and sets a threshold value at a position lowered by a predetermined width from the reference value. A spreading code determining section 111 performs threshold determination between a RAKE output average value obtained from the spreading codes excepting for the spreading codes allocated to the own station and determines the spreading code, which corresponds to the RAKE output average value exceeding the threshold value, as the spreading code multiplexed into the received signal.