摘要:
A reception quality notifying method is disclosed which improves the upstream line throughput by reducing the data mount of reception quality data of downstream multicarrier signals to be transmitted to a base station apparatus in the upstream line. There are also disclosed a base station apparatus and a wireless communication terminal apparatus of a low power consumption for use in that reception quality notifying method. In the apparatus, when a wireless communication terminal apparatus (100) receives a down stream multicarrier signal and then notifies a base station apparatus (200) of a subcarrier having a desirable reception quality for the downstream multicarrier signal, it produces reception quality data of a plurality of formats, then selects, from among the produced reception quality data, one having the lowest data mount, and then transmits the selected reception quality data do the base station apparatus (200) by use of an upstream multicarrier signal subcarrier designated by the base station apparatus (200).
摘要:
A wireless transmission apparatus that can accurately select an optimal modulation scheme on a per block basis in a multi-carrier communication system in which block division of subcarriers and adaptive modulation are performed. In this wireless transmission apparatus, a propagation path characteristics acquisition section (107) acquires the average SNR and SNR dispersion for each block, which are estimated by a wireless reception apparatus (200), using received signals inputted from a reception RF section (106) and outputs these to an assignment section (108), the assignment section (108) selects a modulation scheme for each block based on the average SNR and SNR dispersion of each block inputted from the propagation path characteristics acquisition section (107), and modulation sections (101-1, 101-2, ..., 101-L) modulate multi-carrier signals included in each block, with the modulation scheme for each block selected by the assignment section (108).
摘要:
Wireless communication apparatus capable of improving communication efficiency by reducing the amount of control information transmitted is disclosed. With this apparatus, channel quality information extraction section (103) extracts CQI's from a received signal. Allocation control section 104 allocates subcarriers every communication terminal apparatus and selects a modulation scheme in such a manner that required transmission rate is satisfied for each communication terminal apparatus based on required transmission rate information etc. and CQI's for communication terminal apparatus of each user. Required subcarrier number determining section (105) decides the number of subcarriers allocated every communication terminal apparatus in such a manner as to satisfy the required transmission rate for each communication terminal apparatus based on required transmission rate information etc. of communication terminal apparatus of each user. Required subcarrier number information generating section (107) generates information for the number of subcarriers allocated every communication terminal apparatus. Subcarrier allocation section (110) allocates packet data to selected subcarriers. Modulating sections (111-1 to 111-N) adaptively modulate packet data allocated to each subcarrier.
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 mutlicarrier transmitting apparatus, a multicarrier receiving apparatus and a multicarrier radio communication method, which are capable of improving a throughput of a whole multicarrier radio communication system. Based on receiving SNR values of users 1 to 4 for all of the subcarriers 1 to 4 in a receiving SNR table made, the number of available users U(n) of each subcarrier is calculated. Subcarriers n* having the smallest number of the available users are searched, and a user k* showing the highest receiving SNR value among the researched subcarriers n* having the smallest number of the available users U(n) is searched. Subsequently, the subcarriers n* are allocated to the user k*.
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:
A multicarrier communication method and a multicarrier communication apparatus used for the method for adjusting the arrangement in code block units according to the actual reception state of the multicarrier signal, when arranging code blocks generated through error correcting coding processing not only in the time axis direction but also in the frequency axis direction in order to improve an error correction rate of a multicarrier signal. The method according to the present invention includes a coding processing step of carrying out error correcting coding processing on a multicarrier signal, a transmission step of transmitting the multicarrier signal subjected to the error correcting coding processing, a reception step of receiving the multicarrier signal transmitted, an analysis step of analyzing a reception state based on the multicarrier signal received and an arrangement adjusting step of adjusting the arrangement of code blocks generated through the error correcting coding processing according to the analysis result in the analysis step.