摘要:
The spread codes multiplexed in the received signal are counted. If the number of spread codes is under a predetermined threshold, switches (4, 5) are operated to be connected to a RAKE demodulation section (2); and if the number is a predetermined threshold or more, they are operated to be connected to a joint detection demodulation section (3). Thus, only when the number of multiplexed spread codes is large, namely, only when the number of users is large, the joint detection demodulation requiring a large power consumption is performed, and thereby power for demodulation is saved.
摘要:
There are disclosed a random access method for establishing an individual channel between a radio communication terminal device and a base station device in a short time and a radio communication terminal device executing the random access method. In this device, in step ST320, a RACH sub-channel allocation unit (211) allocates a transmission packet inputted from a replication unit (202) to an arbitrary sub-carrier at the RACH arbitrary time slot at random. In step ST330, an allocation unit (210) judges whether an overlap is generated in the allocation result obtained by the RACH sub-channel allocation unit (211). When the allocation unit (210) judges that an overlap is generated in the allocation result, the allocation unit (210) causes one of the RACH sub-channel allocation units (211) which has caused the overlap to again perform allocation of step ST320. On the other hand, when judgment is made that no overlap is generated in the allocation result, step ST340 is executed.
摘要:
Wireless communication apparatus capable of increasing transmission efficiency by selecting data for scheduling according to data type, and capable of achieving low power consumption and high-speed signal processing is disclosed. With this apparatus, a control section (108) allocates transmission data sequence 1 to subcarriers of superior quality by carrying out scheduling for the transmission data sequence 1 based on CQI sent from communication terminal apparatus and required transmission rate information for each communication terminal apparatus, and allocates transmission data sequence 2 to preassigned subcarriers. Channel allocation section (115) allocates data for transmission data sequence 1 to subcarriers designated by control section (108). Channel allocation section (116) allocates data for transmission data sequence 2 to subcarriers designated by control section (108).
摘要:
A wireless communication apparatus is capable of increasing data capacity that can be transmitted and reducing power consumption by reducing the amount of control signal to be transmitted, and capable of increasing system capacity by reducing interference with respect to other wireless communication apparatuses. In this apparatus, control information extraction section (105) extracts information indicating the number of CQI's contained in control information. Reception quality measuring sections (113-1 to 113-n) measure reception quality of each sub-carrier within a communication band. CQI generating section (114) generates CQI's for some of the sub-carriers of superior reception quality within the communication band. Multiplexer (122) multiplexes CQI's, sub-carrier number information generating the CQI's, and ACK signals or NACK signals. The SC selecting section (127) then selects the number of sub-carriers from a base station apparatus of superior reception quality allocated using the CQI quantity designation information.
摘要:
A CIR measuring section 307 measures CIRs of all blocks received and a block selection section 308 makes a threshold decision based on the CIR measurement result and threshold information according to an amount of traffic in the own cell and neighboring cells. As a result of the threshold decision, blocks whose CIRs exceed the threshold are regarded as usable blocks. A CIR averaging section 309 averages the CIRs of the usable blocks and a CQI generation section 310 generates a CQI based on the CIR average value. The CQI generated and selected block numbers are reported to a base station apparatus. This allows the throughput of the own cell and neighboring cells to be improved.
摘要:
In a radio communication system where A-DPCH (Associated-Dedicated Physical Channel) to which soft hand-over is applied and HS-DPCCH (High Speed-Dedicated Physical Control Channel) to which hard hand-over is applied are mixed, in order to perform appropriate transmission power control of the HS-DPCCH, an HO judging section 11 judges whether the A-DPCH is in a soft hand-over state, and a transmission radio section 23, when the A-DPCH is not in the soft hand-over state, performs transmission power control of the HS-DPCCH according to a TPC command for the A-DPCH transmitted on the A-DPCH, and when the A-DPCH is in the soft hand-over state, performs transmission power control of the HS-DPCCH according to a TPC command for the HS-DPCCH transmitted on the HS-DPCCH.
摘要:
Using midambles, tracking delay profile creator 107 opens correlation windows in the range of 8 chips before and behind the top path and creates delay profiles within this range. From the delay profiles, path determiner 108 detects whether or not there is a new path before the top path, and, when there is a new path, determines whether or not this is its path. Based on the result of the determination at path determiner 108, when the new path is its path, frame position controller 109 sets the top path with the new path. On the other hand, when the new path is not its path, the top path set earlier is retained as is as the top path. Then, in accordance with the timing of the top path set, a received signal is demodulated. By this means, reception quality can be improved.
摘要:
In a wireless communication system in which A-DPCH (Associated - Dedicated Physical CHannel) and HS-DPCCH (High Speed - Dedicated Physical Control CHannel) exist, for the purpose of performing an appropriate outer loop transmission power control for HS-DPCCH even during an A-DPCH DTX (Discontinuous Transmission) period, transmission data monitoring section 12 monitors whether a bit sequence transmitted via A-DPCH is present or not, and dummy data generation section 14 generates a random sequence used for outer loop transmission power control of HS-DPCCH during a DTX period in which a bit sequence is absent, and coding section 16 performs CRC coding on the generated random sequence, and transmission radio section 22 then transmits the CRC-coded random sequence via A-DPCH.
摘要:
An SIR measuring apparatus capable of measuring an SIR after interference cancellation with a high degree of accuracy in a short time after its reception without performing JD demodulation. This apparatus creates a delay profile using midamble sections and measures the SIR using this delay profile and estimated path positions. That is, the signal power measuring section (142) measures signal power from the delay profile and the positions of the selected paths and the interference power measuring section (144) measures interference power from the delay profile and the positions of the selected paths. Then, the signal power correction section (146) and interference power correction section (148) perform necessary corrections and the SIR calculation section (150) calculates the SIR according to predetermined calculation formulas.
摘要:
In a wireless communication system operating in a mixed channel environment involving A-DPCH (Associated - Dedicated Physical CHannel) to which soft handover applies and HS-DPCCH (High Speed - Dedicated Physical Control CHannel) to which hard handover applies, in order to keep the received SIR of HS-DPCCH at the required SIR by performing transmission power control for HS-DPCCH appropriately, HO judgment section 30 judges whether A-DPCH is in a soft handover state or not, transmission radio section 42 sets the transmission power of HS-DPCCH into a power equal to the transmission power of A-DPCH when A-DPCH is not in a soft handover state, whereas the transmission power of HS-DPCCH is set at an addition of the transmission power of A-DPCH and an offset when A-DPCH is in a soft handover state.