摘要:
[Object] To prevent communication performance capabilities from deteriorating even in the cases that the estimation error of the propagation path is significant, and that the variation speed of the propagation path characteristics is fast.[Overcoming Means] An adaptive modulation control apparatus which adaptively selects a modulation parameter from among a plurality of modulation parameters corresponding to an estimation result of a propagation path state and which has a frequency axis gradient calculating section (11) which receives propagation path estimation information indicative of an estimation result of a propagation path state, and calculates a gradient of a function of frequency corresponding to each frequency when the propagation path estimation information is set to be the function of frequency, a correcting section (12) that makes a correction to increase or decrease an upper limit or a lower limit of a numerical range of the propagation path state in one-to-one correspondence with each of the modulation parameters corresponding to the calculated gradient of the function of frequency, and a modulation parameter selecting section (13) that selects a modulation parameter corresponding to the corrected numerical range of the propagation path state including the propagation path estimation information.
摘要:
A wireless communication device receives signals using a channel allocated from N channels to the wireless communication device by another wireless communication device. The wireless communication device includes: a storage that stores information concerning at least newest (M−K) request channels among M request channels that are candidates to be allocated; an additional channel selector that selects K additional channels to be newly added to request channels from the N channels excluding the (M−K) request channels, selects at least newest (M−K) request channels from the request channels including the (M−K) request channels stored and the K additional channels selected, and stores information indicative of the (M−K) request channels selected in the storage; and a report information generator that generates report information that is to be reported to the other wireless communication device and includes information indicative of the K additional channels selected by the additional channel selector.
摘要:
[Object] To prevent communication performance capabilities from deteriorating even in the cases that the estimation error of the propagation path is significant, and that the variation speed of the propagation path characteristics is fast.[Overcoming Means] An adaptive modulation control apparatus which adaptively selects a modulation parameter from among a plurality of modulation parameters corresponding to an estimation result of a propagation path state and which has a frequency axis gradient calculating section (11) which receives propagation path estimation information indicative of an estimation result of a propagation path state, and calculates a gradient of a function of frequency corresponding to each frequency when the propagation path estimation information is set to be the function of frequency, a correcting section (12) that makes a correction to increase or decrease an upper limit or a lower limit of a numerical range of the propagation path state in one-to-one correspondence with each of the modulation parameters corresponding to the calculated gradient of the function of frequency, and a modulation parameter selecting section (13) that selects a modulation parameter corresponding to the corrected numerical range of the propagation path state including the propagation path estimation information.
摘要:
A modulation parameter selecting method and the like is realized, that can realize a high transmission rate efficiently, in a system including, as a scheduler portion, a temporal coding rate determining portion that determines a coding rate temporarily, a temporal modulation rate determining portion for selecting a modulation method that satisfies required quality and has a maximum transmission rate in each channel, under the temporarily determined coding rate, and a transmission rate computing portion that calculates a transmission rate from the coding rate determined at the temporal coding rate determining portion and the modulation method in each of the channels selected at the temporal modulation method determining portion, in which processing from the temporal coding rate determining portion to the transmission rate computing portion is performed repeatedly with respect to selectable coding rates and a coding rate with a maximum transmission rate and a modulation method in each of the channels are determined, and thereby the coding rate is made to be common in a plurality of channels allocated to a predetermined terminal and the modulation method is made different for each of the channels.
摘要:
To perform scheduling for improving throughput, while suppressing control information amounts notified from communication terminal apparatuses. A communication terminal apparatus (200) that is provided with a receiving section (220) that receives a control signal from the communication control apparatus, a reception quality measuring section (250) that measures reception quality of each of the channels, a reception quality information generating section (260) which selects part of channels as selection channels from the plurality of channels, and generates reception quality information to notify the communication-destination apparatus of selection channel information for identifying selected selection channels and reception quality measurement results in the selected selection channels, and a transmitting section (290) that transmits the generated reception quality information to the communication control apparatus, wherein the receiving section (220) receives a data signal assigned to at least one channel contained in the selection channels from the communication control apparatus (100).
摘要:
A communications system of the present invention is an OFDMA system (100) including a base station (10) and mobile stations (20), the base station (10) communicating wirelessly with the mobile stations (20) over a plurality of channels. Each mobile station (20) includes: a reception quality measuring section (19) for measuring reception quality; and a reception quality information determining section (12) for generating reception quality information only for each subgroup that belongs to the group(s) allocated to that mobile station (20) to report, (i) by 2-step grouping scheme information by which the channels are divided into subgroups, the subgroups are divided into groups, and the groups are allocated to the mobile stations (20) and (ii) according to the reception quality measured by the reception quality measuring section (19). The base station (10) schedules wireless communications over the channels according to the reported reception quality information. Accordingly, the amount of the reception quality information sent from the terminals to the base station is reduced to improve throughput.
摘要:
To generate notification information for improving accuracy of channel quality information reconstructed based on a difference in notifying using the difference in channel quality information between channels. A notification information generating apparatus 400 has a notification information table 401 that stores a plurality of difference-value candidate values each indicating a difference between two pieces of channel quality information as candidate values for the notification information, a reconstructing section 403 that generates a reconstruction value using the notification information generated based on the channel quality information of a first channel, and a selecting section 402 which receives the channel quality information of a second channel differing from the first channel, selects a single candidate value from the candidate values for the notification information based on the channel quality information of the second channel and the reconstruction value, and generates the notification information based on the selected candidate value.
摘要:
A modulation parameter selecting method in a system including, as a scheduler portion, a temporal coding rate determining portion that determines a coding rate temporarily, a temporal modulation rate determining portion for selecting a modulation method that satisfies required quality and has a maximum transmission rate in each channel, under the temporarily determined coding rate, and a transmission rate computing portion that calculates a transmission rate from the coding rate determined at the temporal coding rate determining portion and the modulation method in each of the channels selected at the temporal modulation method determining portion, in which processing from the temporal coding rate determining portion to the transmission rate computing portion is performed repeatedly with respect to selectable coding rates and a coding rate with a maximum transmission rate and a modulation method in each of the channels are determined.
摘要:
Provided is a communication system that can allocate resources on an uplink for a CQI report, and can reduce the overhead of the CQI relay transmission from a relay station apparatus to a base station apparatus. To each mobile station apparatus (501, 502) that transmits CQI directly to a base station apparatus (500), resource blocks on a base station apparatus uplink to be used for the transmission of each CQI to the base station apparatus are allocated. Resource blocks on the base station apparatus uplink to be used for each relay station to relay-transmit to the base station apparatus CQI received from the mobile station apparatuses are allocated on the basis of the allocation result of resource blocks on a relay station apparatus uplink for each relay station apparatus (510, 520). To mobile station apparatuses that transmit CQI to the base station apparatus via each relay station apparatus, resource blocks on the relay station apparatus uplink to be used for the transmission of CQI to the relay station apparatus are allocated.
摘要:
Reception quality measurement results of respective channels which have been outputted from a reception quality measuring section 308 are inputted to a selected channel determining section 341 and a channel quality information generating section 342. Moreover, the number of selected channels M which has been previously defined or the number of selected channels M which has been outputted from a control information obtaining section 314 is inputted to the selected channel determining section 341 and a channel identification information generating section 343. The selected channel determining section 341 selects M channels in order of goodness of the reception quality measurement result, as the selected channels, based on the reception quality measurement results of the respective channels, and outputs a selection result. The channel quality information generating section 342 generates and outputs channel quality information representing the reception quality measurement results related to the selected M channels, based on the selection result outputted from the selected channel determining section 341. The channel identification information generating section 343 selects one of a first representation format for representation with M identification numbers (channel numbers) indicating the respective selected channels, and a second representation format for representation with a bit sequence representing whether or not each of all the channels is included in the selected channels, in a binary manner, based on the number of selected channels M, and uses the selected representation format to generate and output channel identification information based on the selection result outputted from the selected channel determining section 341. A multiplexing section 344 combines the channel quality information outputted from the channel quality information generating section 342 and the channel identification information outputted from the channel identification information generating section 343 to generate and output notification information.