WO2009096406A1 - 中継装置、通信システムおよび通信方法 - Google Patents
中継装置、通信システムおよび通信方法 Download PDFInfo
- Publication number
- WO2009096406A1 WO2009096406A1 PCT/JP2009/051319 JP2009051319W WO2009096406A1 WO 2009096406 A1 WO2009096406 A1 WO 2009096406A1 JP 2009051319 W JP2009051319 W JP 2009051319W WO 2009096406 A1 WO2009096406 A1 WO 2009096406A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information
- unit
- channel quality
- relay
- cqi
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Definitions
- the present invention relates to a relay device, a communication system, and a communication method for relaying wireless communication between a control station device and a terminal device.
- the carrier frequency is expected to increase as the frequency band used increases.
- the propagation loss of radio waves increases, and the cell size decreases.
- it is necessary to add a base station device but the cost increases. Therefore, a system in which a relay device is installed between the base station device and the mobile station device has been studied. Since the mobile station device only needs to communicate with the relay device instead of the base station device that exists far away, the transmission power can be greatly reduced.
- Non-Patent Document 1 proposes a system suitable for adaptive modulation technology using a relay device.
- Non-Patent Document 1 will be described with reference to FIG. Since the mobile station apparatus m1 has a good propagation state from the base station apparatus 190, the mobile station apparatus m1 performs communication by highly efficient data modulation such as 64QAM (Quadrature Amplitude Modulation). It is assumed that the mobile station apparatus m2 has a poor propagation state from the base station apparatus 190 and QPSK (Quadrature Phase Shift Keying) is applied. However, since the propagation status from the relay apparatus 191 is good, by selecting a relay path from the relay apparatus 191, communication can be performed using more efficient data modulation such as 16QAM.
- 64QAM Quadrature Amplitude Modulation
- QPSK Quadrature Phase Shift Keying
- each mobile station apparatus m sends received channel quality information (CQI) to the base station apparatus 190 using the uplink. Need to be notified.
- CQI channel quality information
- each mobile station apparatus m notifies the CQI to the relay apparatuses 191a and 191b, and the relay apparatuses 191a and 191b further transmit the same CQI to the base station apparatus. Since notification must be made, there is a problem that overhead increases. An increase in the amount of CQI information to be notified leads to deterioration in frequency use efficiency.
- the present invention has been made in view of such circumstances, and the relay apparatus compresses the information amount of the channel quality information notified from the plurality of terminal apparatuses and notifies the control station apparatus of the frequency, It is an object of the present invention to provide a relay device, a communication system, and a communication method that can improve utilization efficiency.
- the relay apparatus of the present invention is applied to a communication system in which a control station apparatus and a terminal apparatus perform wireless communication using a plurality of subchannels, and is a relay apparatus that relays communication between the control station apparatus and the terminal apparatus.
- a receiving unit that receives channel quality information indicating the reception quality of the subchannel from the terminal device, and a compressing unit that compresses the information amount of the received channel quality information and generates notification information to be notified to the control station device
- a transmission unit that transmits the generated notification information to the control station apparatus.
- the information amount of the received channel quality information is compressed and notification information to be notified to the control station device is generated, the information amount that the relay device notifies to the control station device can be reduced.
- the reduced resources for information data communication it is possible to improve the frequency utilization efficiency.
- the receiving unit receives channel quality information from a plurality of terminal devices, and the compression unit selects a part of the received plurality of channel quality information. It is characterized by generating notification information.
- notification information is generated by selecting a part of the received plurality of channel quality information, the amount of information that the relay apparatus notifies to the control station apparatus can be reduced. By using the reduced resources for information data communication, it is possible to improve the frequency utilization efficiency.
- the compression unit selects channel quality information in order of good reception quality.
- channel quality information is selected in the order of good reception quality, it is possible to preferentially select channels with good propagation path conditions and to reduce the amount of information.
- the compression unit preferentially selects channel quality information having the best reception quality from each subchannel one by one.
- channel quality information with the best reception quality is selected one by one from each sub-channel preferentially, the number of channel quality information to be selected can be kept substantially constant between sub-channels. .
- the compression unit selects channel quality information so that a difference in the number of channel quality information selected for each terminal apparatus is smaller than a predetermined value. It is said.
- the channel quality information is selected so that the difference in the number of channel quality information selected for each terminal apparatus is smaller than a predetermined value, the number of channels allocated to each user is kept substantially constant. It becomes possible.
- the relay device further includes a moving speed detection unit that acquires the moving speed information of the terminal device, and the compression unit prioritizes channel quality information of the acquired terminal device having a low moving speed. It is characterized by the choice.
- the relay apparatus further includes a QoS level information acquisition unit that acquires QoS (Quality ⁇ ⁇ ⁇ of ⁇ Service) level information in the downlink of the terminal device, and the compression unit includes the acquired QoS level. It is characterized by preferentially selecting channel quality information of a high terminal device.
- QoS Quality ⁇ ⁇ ⁇ of ⁇ Service
- the receiving unit receives channel quality information of a plurality of channels from the terminal device, and the compression unit groups the channel quality information of the plurality of channels into at least one group.
- Group quality information is generated from channel quality information belonging to the group, and at least one group quality information is selected to generate notification information.
- the channel quality information notified by the terminal device is notified to the control station device, but the channel quality information is reduced by grouping the channel quality information, and then the channel quality information is sent to the control station device. Since notification is made as notification information, the amount of channel quality information from the relay apparatus to the control station apparatus can be reduced.
- the receiving unit receives orthogonal transform reception quality information obtained by orthogonal transforming reception quality for each subchannel from the terminal device, and the compression unit The notification information is generated by selecting a part of the orthogonal transform reception quality information.
- the relay apparatus reduces the number of DCT points and reduces the amount of information before the channel quality information is transmitted to the control station apparatus. Therefore, the amount of channel quality information from the relay apparatus to the control station apparatus can be reduced.
- the compression unit is characterized in that the notification information is generated by reducing the number of quantization bits representing the channel quality information.
- the channel quality information notified by the terminal device is notified to the control station device, but the channel quality information is transmitted to the control station device after reducing the number of quantization bits in the relay device and reducing the amount of information. Therefore, the amount of channel quality information from the relay apparatus to the control station apparatus can be reduced.
- the communication system of the present invention is a communication system in which a control station apparatus and a terminal apparatus perform wireless communication via a relay apparatus using a plurality of subchannels, and the terminal apparatus includes subchannels.
- Channel quality information indicating the reception quality of the channel quality information is transmitted to the relay device, the relay device compresses the amount of channel quality information received from the terminal device to generate notification information, and the generated notification information The information is transmitted to the control station apparatus, and the control station apparatus receives the notification information from the relay apparatus.
- the information amount of the received channel quality information is compressed and notification information to be notified to the control station device is generated, the information amount that the relay device notifies to the control station device can be reduced.
- the reduced resources for information data communication it is possible to improve the frequency utilization efficiency.
- a communication system transmits at least one of the relay device according to any one of claims 1 to 10 and channel quality information indicating reception quality of a subchannel to the relay device. It is characterized by comprising one terminal device and a control station device that receives channel quality information in which the amount of information is compressed from the relay device.
- the information amount of the received channel quality information is compressed and notification information to be notified to the control station device is generated, the information amount that the relay device notifies to the control station device can be reduced.
- the reduced resources for information data communication it is possible to improve the frequency utilization efficiency.
- the communication method of the present invention is applied to a communication system in which a control station apparatus and a terminal apparatus perform wireless communication using a plurality of subchannels, and relays communication between the control station apparatus and the terminal apparatus.
- the receiving unit receives channel quality information indicating the reception quality of the subchannel from the terminal device
- the compression unit compresses the information amount of the received channel quality information
- the method includes at least a step of generating notification information to be notified to the control station device, and a step of transmitting the generated notification information to the control station device in a transmission unit.
- the information amount of the received channel quality information is compressed and notification information to be notified to the control station device is generated, the information amount that the relay device notifies to the control station device can be reduced.
- the reduced resources for information data communication it is possible to improve the frequency utilization efficiency.
- the information amount of the received channel quality information is compressed and the notification information to be notified to the control station device is generated, the information amount that the relay device notifies to the control station device can be reduced.
- the reduced resources for information data communication it is possible to improve the frequency utilization efficiency.
- Base station apparatus 191 Relay apparatus 191a, 191b Relay apparatus 200 Mobile station apparatus 201 Encoding section 202 Mapping section 203 Multiplexing section 204 CQI generation section 204a Subcarrier quality measurement section 204b Subchannel quality measurement section 204c Top-M selection section 204d DCT Unit 204e sample number changing unit 205 wireless transmission unit 206 antenna 207 wireless reception unit 208 separation unit 209 channel estimation unit 210 channel compensation unit 211 demapping unit 212 decoding unit 400 relay device 401 antenna 402 wireless reception unit 403 separation unit 404 multiplexing unit 405 CQI compression unit 406 Radio transmission unit 407 Detection unit 900 Base station apparatus 901 Antenna 902 Radio reception unit 903 Separation unit 904 Channel estimation unit 905 Channel compensation unit 906 Demapping unit 907 Decoding unit 908 Scheduling unit 909 encoding unit 910 mapping unit 911 multiplexing unit 912 radio transmission unit
- the relay apparatus reduces the information amount of CQI (Channel Quality Indicator) notified from a plurality of mobile station devices, and notifies the base station device of the CQI with the reduced information amount.
- CQI Channel Quality Indicator
- the control station apparatus corresponds to the base station apparatus
- the terminal apparatus corresponds to the mobile station apparatus, but the present invention is not limited to this.
- the control station device may be an access point in a wireless LAN
- the terminal device may be a computer in the wireless LAN.
- a mobile station device used by a user may be simply referred to as a user.
- FIG. 1 is a diagram illustrating resource usage. As shown in FIG. 1, when the information amount of CQI is reduced, if the reduced resource is used as a resource for communication of information data, the frequency utilization efficiency can be improved as compared with the conventional case.
- FIG. 2 is a block diagram showing a schematic configuration of the mobile station apparatus according to the present embodiment.
- the mobile station apparatus 200 includes an encoding unit 201, a mapping unit 202, a multiplexing unit 203, a CQI generation unit 204, a wireless transmission unit 205, an antenna 206, a wireless reception unit 207, a separation unit 208, a channel An estimation unit 209, a channel compensation unit 210, a demapping unit 211, and a decoding unit 212 are provided.
- Information data of mobile station apparatus 200 is input to encoding section 201.
- the encoding unit 201 performs error correction encoding and outputs the result to the mapping unit 202.
- Mapping section 202 performs digital modulation such as QPSK or 16QAM on the output bit sequence of encoding section 201, assigns it to a predetermined subcarrier, and outputs the result to multiplexing section 203.
- the multiplexing unit 203 multiplexes the output of the mapping unit 202 and the CQI, pilot signal, etc. output from the CQI generation unit 204 described later.
- the signal multiplexed by the multiplexing unit 203 is output to the wireless transmission unit 205.
- the wireless transmission unit 205 generates an analog signal waveform from the baseband digital signal and performs wireless transmission using the antenna 206.
- a signal received by the antenna 206 is converted into a baseband digital signal by the wireless reception unit 207.
- the output of the wireless reception unit 207 is input to the separation unit 208.
- Separating section 208 outputs the received pilot signal to channel estimating section 209, outputs the received data section to channel compensating section 210, and outputs scheduling control information to demapping section 211 and decoding section 212.
- Channel estimation section 209 estimates the channel at each frequency using the received pilot signal separated by separation section 208.
- the channel estimation value is input to CQI generation section 204 and channel compensation section 210.
- the channel compensation unit 210 performs channel compensation of the reception data signal separated by the separation unit 208 and outputs the result to the demapping unit 211.
- the demapping unit 211 decomposes the data signal input from the channel compensation unit 210 into a bit sequence based on the scheduling control information separated by the separation unit 208, and outputs the bit sequence to the decoding unit 212.
- the decoding unit 212 performs error correction decoding based on the scheduling control information separated by the separation unit 208 and outputs information data.
- FIG. 3 is a block diagram showing a schematic configuration of the CQI generation unit 204 shown in FIG.
- CQI generation section 204 includes subcarrier quality measurement section 204a, subchannel quality measurement section 204b, and Top-M selection section 204c.
- the channel estimation value output by channel estimation section 209 shown in FIG. 2 is input to subcarrier quality measurement section 204a.
- the subcarrier quality measurement unit 204a uses the input channel estimation value to perform communication such as SNR (Signal-to-Noise power ratio), CNR (Carrier-to-Noise power ratio), and MCS (Modulation and coding coding scheme). A value indicating quality is calculated.
- SNR Signal-to-Noise power ratio
- CNR Carrier-to-Noise power ratio
- MCS Modulation and coding coding scheme
- the communication quality for each subcarrier measured by the subcarrier quality measuring unit 204a is input to the subchannel quality measuring unit 204b.
- the subchannel quality measurement unit 204b obtains the quality for each subchannel based on the communication quality for each subcarrier, and outputs the quality to the Top-M selection unit 204c.
- a subchannel is a set of one or more subcarriers. Further, the sub-channel quality determination method may be averaging within the sub-channel or any method such as maximum or minimum quality.
- the Top-M selection unit 204c selects the communication quality of the top M (M is an integer equal to or greater than 1) subchannels from the communication quality for each subchannel, and outputs it to the multiplexing unit 203 as CQI.
- FIG. 4 is a block diagram illustrating a schematic configuration of the relay apparatus.
- the relay device 400 includes an antenna 401 (for transmission and reception), a wireless reception unit 402, a separation unit 403, a multiplexing unit 404, a CQI compression unit 405, a wireless transmission unit 406, and a detection unit 407. .
- the relay apparatus 400 receives the signal transmitted from each mobile station apparatus by the antenna 401.
- the received signal is input to the wireless reception unit 402.
- the wireless reception unit 402 converts an analog waveform into a digital signal.
- the digital signal is input to the separation unit 403.
- Separating section 403 separates the received signal into signals other than CQI and CQI, outputs CQI to CQI compressing section 405, and outputs signals other than CQI to multiplexing section 404.
- FIG. 5 is a diagram illustrating a state in which the CQI notified by each mobile station apparatus and the CQI of each mobile station apparatus are multiplexed in the relay apparatus.
- the horizontal axis indicates the CQI channel number
- the vertical axis indicates the reception quality.
- the CQI compression unit 405 reduces the M ⁇ U CQIs received by the relay apparatus 400 (U is the number of users who have notified the relay apparatus of the CQI and is an integer of 1 or more) to M ′ CQIs.
- FIG. 6 to FIG. 8 are diagrams illustrating how the amount of CQI information is reduced.
- M ′ 6
- the top six reception qualities indicated by hatching are selected from a total of nine CQIs for three users.
- the CQI selected in FIG. 6 is subchannel 5 of user 3, subchannel 3 of user 3, subchannel 3 of user 2, subchannel 2 of user 2, subchannel 6 of user 1, subchannel 6 of user 3 It becomes the order.
- the relay apparatus sequentially selects the CQI in the best state, but there is a reduction method that avoids selecting a plurality of subchannels in each subchannel. For example, in FIG. 7, CQI selection is performed in the order of subchannel 5 of user 3 and subchannel 3 of user 3. Next, the value of the CQI is high in the subchannel 3 of the user 2, but since the subchannel 3 has already been selected, the subchannel 3 of the user 2 and the subchannel of the user 1 are not selected in this case. Subchannel 1 of channel 6 and user 2 is selected. Finally, when the number of selected CQIs is less than M ′, the subchannel with the highest quality (subchannel 3 of user 2) is selected from the subchannels not selected previously.
- the relay apparatus sequentially selects the CQI in the best state, but avoids selecting a plurality of subchannels in each subchannel and each mobile station.
- the selection process if the subchannel has already been selected for CQI, such as the subchannel 3 of the user 2 or the subchannel 5 of the user 1, the subchannel is skipped and the subchannel 2 of the user 2 is skipped. , Subchannel 1 of user 2 is preferentially selected. Finally, when the number of selected CQIs is less than M ′, the CQIs are selected so that the number of CQIs of each mobile station apparatus becomes equal. For example, in the case of FIG. 8, when a subchannel is selected while avoiding a previously selected subchannel, only the subchannel 6 is selected by the user 1. Therefore, by selecting the subchannel 5 of the user 1, Select the same number of CQIs for all users.
- the CQI compression unit 405 of the relay apparatus 400 can reduce the amount of CQI information from the relay apparatus to the base station apparatus by compressing the CQI information of each mobile station apparatus by the various reduction methods as described above.
- the detecting unit 407 constitutes a moving speed detecting unit that detects moving speed information of the mobile station device, or a QoS level information acquiring unit that acquires QoS (QualityQualof Service) level information in the downlink of the mobile station device. Then, when the CQI is reduced, the CQI may be reduced in consideration of the moving speed of the mobile station apparatus, QoS, or the like.
- the CQI of a mobile station apparatus with a low moving speed may be preferentially selected, or the CQI of a user with a high QoS may be preferentially selected.
- the CQI information amount reducing method may be any method as long as it can reduce the CQI information amount as described above.
- the CQI compressed by the CQI compression unit 405 is input to the multiplexing unit 404.
- Multiplexer 404 multiplexes signals other than CQI input from separator 403 and M ′ CQIs obtained by CQI compressor 405.
- the output of the multiplexing unit 404 is input to the wireless transmission unit 406.
- the wireless transmission unit 406 generates an analog transmission waveform and transmits a wireless signal using the antenna 401.
- the relay apparatus 400 does not notify the base station apparatus of all the CQIs notified by the plurality of mobile station apparatuses, and notifies the base station apparatus of the CQIs after reducing the CQI.
- the amount of CQI information to the station apparatus can be reduced.
- FIG. 9 is a block diagram illustrating a schematic configuration of the base station apparatus according to the present embodiment.
- the base station apparatus 900 includes an antenna 901, a radio reception unit 902, a separation unit 903, a channel estimation unit 904, a channel compensation unit 905, a demapping unit 906, a decoding unit 907, a scheduling unit 908, an encoding unit 909, a mapping unit 910, A multiplexing unit 911 and a wireless transmission unit 912 are provided.
- the analog signal received by the antenna 901 is converted into a baseband digital signal by the wireless reception unit 902 and output to the separation unit 903.
- Separating section 903 separates the pilot signal from the input received signal and outputs it to channel estimating section 904. Separating section 903 separates the data signal from the input received signal and outputs it to channel compensating section 905. Separating section 903 separates the CQI of each mobile station apparatus from the input received signal and outputs the separated CQI to scheduling section 908.
- the channel estimation unit 904 obtains a channel estimation value using the received reception pilot signal.
- the obtained channel estimation value is output to channel compensation section 905.
- Channel compensation section 905 compensates for distortion that the data signal has received on the channel, using the received data signal input and the channel estimation value input from channel estimation section 904.
- the output of the channel compensation unit 905 is input to the demapping unit 906, where the demapping unit 906 performs decomposition into bits based on the modulation performed by the mobile station apparatus.
- the output of the demapping unit 906 is input to the decoding unit 907, and error correction decoding is performed based on error correction coding performed by the mobile station apparatus to obtain information data.
- the scheduling section 908 determines resource (frequency, time) allocation, modulation scheme, coding rate, and the like of each mobile station apparatus in the downlink based on the CQI information notified from each mobile station apparatus. For example, as shown in FIG. 10, if the CQIs of users 4 to 6 are notified to the base station apparatus from other relay apparatuses, base station apparatus 900 performs scheduling from the table as shown in FIG. When scheduling is performed by “Max-CIR”, subchannel 1 is scheduled to be user 4, subchannel 2 is user 2, subchannels 3 and 4 are user 6, subchannel 5 is user 3, and subchannel 6 is user 1. Is done. FIG. 10 shows an example of “Max-CIR”.
- the scheduling section 908 is different from the CQI value of each subchannel and the average value of all the subchannels notified separately or the average value of notified CQI. Scheduling may be performed by “Proportional Fairness”, which allocates resources to the user who becomes the largest.
- Scheduling section 908 allocates resources as described above, and determines the coding rate and modulation scheme from the communication quality of the allocated resources. Control information (resource allocation, coding rate, and modulation scheme) determined by the scheduling unit 908 is input to the coding unit 909, the mapping unit 910, and the multiplexing unit 911.
- Downlink information data from the base station apparatus to each mobile station apparatus is input to the encoding unit 909.
- the encoding unit 909 performs encoding based on the control information (coding rate) notified from the scheduling unit 908 and outputs the encoded bits to the mapping unit 910.
- Mapping section 910 performs mapping according to control information (resource allocation and modulation scheme) notified from scheduling section 908 for the encoded bits, and outputs the mapped bits to multiplexing section 911.
- Multiplexing section 911 multiplexes the pilot signal and control information input from scheduling section 908 in addition to the output of mapping section 910.
- the signal multiplexed by the multiplexing unit 911 is output to the wireless transmission unit 912, converted from a baseband digital signal to an analog signal, and then transmitted from the antenna 901.
- a plurality of mobile station apparatuses notify the relay apparatus of the CQI, and the relay apparatus reduces the CQI notified by the mobile station apparatus to the base station apparatus. Therefore, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced. By allocating resources obtained by reducing CQI to data, it is possible to improve frequency utilization efficiency.
- the relay device reduces the CQI information of the CQI of at least one mobile station device that has notified the relay device of the CQI, and notifies the base station device of the CQI with a small amount of information.
- the mobile station apparatus adopts the configuration shown in FIG. 2 as in the first embodiment. That is, the mobile station apparatus 200 includes an encoding unit 201, a mapping unit 202, a multiplexing unit 203, a CQI generation unit 204, a wireless transmission unit 205, an antenna 206, a wireless reception unit 207, a separation unit 208, a channel estimation unit 209, and channel compensation.
- Unit 210, demapping unit 211, and decoding unit 212 and functions in the same manner as in the first embodiment.
- relay device 400 adopts the configuration shown in FIG. 4 as in the first embodiment. That is, relay device 400 includes antenna 401 (for transmission and reception), radio reception unit 402, demultiplexing unit 403, multiplexing unit 404, CQI compression unit 405, and radio transmission unit 406.
- CQI compression section 405 reduces M ⁇ U CQIs received from each mobile station apparatus (U is the number of users who have notified CQI to the relay apparatus and is an integer of 1 or more).
- grouping is used as the CQI compression method in the CQI compression unit 405.
- the mobile station apparatus notifies the CQI and is input to the CQI compression unit 405 of the relay apparatus 400 as shown in the upper diagram of FIG.
- CQI compression section 405 groups subchannels (a subchannel is a set of one or more subcarriers) and reduces CQI.
- the method for determining quality after grouping may be averaging within the subchannel, or any method such as maximum or minimum quality.
- the reception quality for each subchannel in the upper diagram in FIG. 11 is reduced by grouping four subchannels into CQI. Since grouping is a combination of one or more subchannels, all subchannels may be grouped into one. Further, the number of subchannels to be grouped may vary depending on the mobile station apparatus. The subchannels are grouped based on the reception quality of the subchannel of the mobile station device, the strength of frequency selectivity, the moving speed of the mobile station device, QoS, and the like. For example, when considering the moving speed, CQIs of mobile station apparatuses having a high moving speed may be preferentially grouped, or CQIs of users having low QoS may be preferentially grouped.
- the CQI compressed by the CQI compression unit 405 is input to the multiplexing unit 404.
- Multiplexing section 404 multiplexes signals other than CQI input from demultiplexing section 403 and CQI after grouping obtained by CQI compression section 405.
- the output of the multiplexing unit 404 is input to the wireless transmission unit 406.
- the wireless transmission unit 406 generates an analog transmission waveform and transmits a wireless signal using the antenna 401.
- the relay apparatus does not notify all the subchannel CQIs notified to the relay apparatus by a plurality of mobile station apparatuses to the base station apparatus, but groups the CQIs of the subchannels in the relay apparatus. Since the CQI is notified to the base station apparatus after reducing the amount of CQI, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced.
- the base station apparatus 900 includes an antenna 901, a radio reception unit 902, a separation unit 903, a channel estimation unit 904, a channel compensation unit 905, a demapping unit 906, a decoding unit 907, a scheduling unit 908, an encoding unit 909, and a mapping unit. 910, a multiplexing unit 911, and a wireless transmission unit 912.
- the scheduling unit 908 uses the scheduling method such as “Max-CIR” or “Proportional Fairness” to provide resources (frequency, time) of each mobile station device in the downlink. Assign.
- scheduling section 908 determines the coding rate and modulation scheme from the communication quality of the allocated resource. Control information (resource allocation, coding rate, and modulation scheme) determined by the scheduling unit 908 is input to the coding unit 909, the mapping unit 910, and the multiplexing unit 911.
- the plurality of mobile station apparatuses notify the relay apparatus of the CQI for each subchannel, and the relay apparatus groups the CQI for each subchannel notified by the mobile station apparatus.
- the CQI since the CQI is reduced and notified to the base station apparatus, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced.
- the relay apparatus receives CQIs of a plurality of mobile station apparatuses, reduces CQI information of the plurality of mobile station apparatuses, and notifies the base station apparatus of a CQI having a small amount of information.
- the mobile station apparatus adopts the configuration shown in FIG. 2 as in the first embodiment. That is, the mobile station apparatus 200 includes an encoding unit 201, a mapping unit 202, a multiplexing unit 203, a CQI generation unit 204, a wireless transmission unit 205, an antenna 206, a wireless reception unit 207, a separation unit 208, a channel estimation unit 209, and channel compensation. Unit 210, demapping unit 211, and decoding unit 212. In the third embodiment, only the configuration of the CQI generation unit 204 is different from that of the first embodiment.
- FIG. 12 is a diagram illustrating a schematic configuration of the CQI generation unit 204 of the mobile station apparatus according to the present embodiment.
- the CQI generating unit 204 includes a subcarrier quality measuring unit 204a, a subchannel quality measuring unit 204b, a DCT (Discrete Cosine Transform) 204d unit, and a sample number changing unit 204e.
- the channel estimation value input from channel estimation section 209 shown in FIG. 2 is input to subcarrier quality measurement section 204a.
- the subcarrier quality measurement unit 204a measures the reception quality for each subcarrier from the channel estimation value and outputs it to the subchannel quality measurement unit 204b.
- the subchannel quality measurement unit 204b measures the reception quality for each subchannel from the input quality for each subcarrier, and outputs it to the DCT unit 204d.
- a subchannel is composed of one or more subcarriers.
- the sub-channel quality determination method may be averaging within the sub-channel, or any method such as maximum or minimum quality.
- the DCT unit 204d performs DCT on the obtained reception quality for each subchannel.
- FIG. 13 shows the result of performing DCT on the reception quality of 64 subchannels.
- the horizontal axis indicates the sample number
- the vertical axis indicates the sample value.
- the DCT unit 204d outputs the 64-point sample value obtained by the DCT in this way to the sample number changing unit 204e.
- the sample number changing unit 204e changes the sample value from the input 64-point sample value and outputs it as a CQI. For example, as shown in FIG. 14, the sample value of 64 points is reduced to 32 points to obtain CQI.
- the relay apparatus 400 adopts the configuration shown in FIG. 4 as in the first embodiment. That is, the relay apparatus 400 includes an antenna 401 (for transmission and reception), a radio reception unit 402, a separation unit 403, a multiplexing unit 404, a CQI compression unit 405, and a radio transmission unit 406, and is the same as in the first embodiment. To work.
- the number of DCT points is reduced.
- the CQI compression unit 405 reduces the number of DCT points from the notified CQI of each user based on the reception quality of the subchannel, the strength of frequency selectivity, the moving speed of the mobile station apparatus, the QoS, and the like.
- the CQI to be determined is determined. For example, when the mobile station apparatus reports a 32-point sample value as CQI, reception quality as shown by a solid line in FIG. 15 can be obtained by performing IDCT (Inverse Discrete Cosine Transform) in the relay device.
- IDCT Inverse Discrete Cosine Transform
- CQI compression section 405 reduces the number of DCT points and notifies the base station apparatus.
- FIG. 16 is a diagram showing a result of selecting 16 points of the DCT result, and the IDCT result of FIG. 16 is as shown by a solid line in FIG.
- the selection of the mobile station apparatus that changes the number of points preferentially reduces the number of DCT points of the mobile station apparatus having a high moving speed, or preferentially reduces the number of DCT points of the mobile station apparatus having a low QoS. do it.
- the CQI reduced by the CQI compression unit 405 is input to the multiplexing unit 404.
- Multiplexing section 404 multiplexes signals other than CQI input from demultiplexing section 403 and CQI after the reduction of the number of DCT points obtained by CQI compression section 405.
- the output of the multiplexing unit 404 is output to the wireless transmission unit 406.
- the wireless transmission unit 406 generates an analog transmission waveform and transmits a wireless signal using the antenna 401.
- the relay apparatus does not notify all the CQIs of the subchannels notified to the relay apparatus by the plurality of mobile station apparatuses to the base station apparatus, but determines the number of DCT points in the relay apparatus. Since the CQI is notified to the base station apparatus after the reduction, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced.
- the base station device adopts the configuration shown in FIG. 9 as in the first embodiment. That is, the base station apparatus 900 includes an antenna 901, a radio reception unit 902, a separation unit 903, a channel estimation unit 904, a channel compensation unit 905, a demapping unit 906, a decoding unit 907, a scheduling unit 908, an encoding unit 909, and a mapping unit. 910, a multiplexing unit 911, and a wireless transmission unit 912.
- Scheduling section 908 restores the reception quality for each subchannel by performing IDCT on the CQI information notified from each mobile station apparatus, and uses the obtained reception quality for each subchannel of “Max ⁇
- the resources (frequency, time) of each mobile station apparatus in the downlink are allocated by a scheduling method such as “CIR” or “Proportional Fairness”. Further, scheduling section 908 determines the coding rate and modulation scheme from the communication quality of the allocated resource. Control information (resource allocation, coding rate, and modulation scheme) determined by the scheduling unit 908 is input to the coding unit 909, the mapping unit 910, and the multiplexing unit 911.
- a plurality of mobile station apparatuses notify the relay apparatus of the CQI after DCT, and the relay apparatus reduces the number of DCT points in the CQI notified by the mobile station apparatus. Therefore, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced. By allocating resources obtained by reducing CQI to data, it is possible to improve frequency utilization efficiency.
- the relay device reduces the CQI information of the plurality of mobile station devices that have notified the relay device of the CQI, and notifies the base station device of the CQI of a small amount of information.
- the mobile station apparatus adopts the configuration shown in FIG. 2 as in the first embodiment. That is, the mobile station apparatus 200 includes an encoding unit 201, a mapping unit 202, a multiplexing unit 203, a CQI generation unit 204, a wireless transmission unit 205, an antenna 206, a wireless reception unit 207, a separation unit 208, a channel estimation unit 209, and channel compensation. Unit 210, demapping unit 211, and decoding unit 212. In the third embodiment, only the function of the CQI generation unit 204 is different from that of the first embodiment.
- the CQI generation unit 204 includes a subcarrier quality measurement unit 204a, a subchannel quality measurement unit 204b, and a Top-M selection unit 204c, as shown in FIG.
- the channel estimation value from channel estimation section 209 shown in FIG. 2 is input to subcarrier quality measurement section 204a.
- the subcarrier quality measurement unit 204a uses the channel estimation value to calculate a value indicating communication quality such as SNR, CNR, or MCS.
- the communication quality for each subcarrier measured by the subcarrier quality measuring unit 204a is input to the subchannel quality measuring unit 204b.
- the subchannel quality measurement unit 204b obtains the quality for each subchannel based on the communication quality for each subcarrier, performs quantization, and outputs the result to the Top-M selection unit 204c.
- a subchannel is composed of one or more subcarriers. Further, the sub-channel quality determination method may be averaging within the sub-channel, or any method such as maximum or minimum quality.
- the Top-M selection unit 204c selects the communication quality of the top M (M is an integer equal to or greater than 1) subchannels from the communication quality for each subchannel, and outputs it as a CQI to the multiplexing unit.
- relay device 400 includes antenna 401 (for transmission and reception), radio reception unit 402, demultiplexing unit 403, multiplexing unit 404, CQI compression unit 405, and radio transmission unit 406.
- the number of quantization bits of the reception quality of the subchannel is reduced.
- the CQI compression unit 405 reduces the number of quantization bits from the notified CQI of each user based on the reception quality of the subchannel, the strength of frequency selectivity, the moving speed of the mobile station apparatus, the QoS, and the like.
- the CQI to be determined is determined. For example, when the mobile station apparatus notifies the reception quality quantized with 4 bits as CQI as shown in the left figure of FIG. 18, the relay apparatus converts it into 2 bits as shown in the right figure of FIG. Quantize again.
- the CQI reduced by the CQI compression unit 405 is input to the multiplexing unit 404.
- Multiplexer 404 multiplexes signals other than CQI input from separator 403 and CQI after the number of quantization bits obtained by CQI compressor 405 is reduced.
- the output of the multiplexing unit 404 is input to the wireless transmission unit 406.
- the wireless transmission unit 406 generates an analog transmission waveform and transmits a wireless signal using the antenna 401.
- the relay apparatus does not notify all the CQIs of the subchannels notified to the relay apparatus by the plurality of mobile station apparatuses to the base station apparatus, but sets the number of quantization bits in the relay apparatus. Since the CQI is notified to the base station apparatus after the reduction, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced.
- the base station apparatus employs the configuration shown in FIG. 9 as in the first embodiment. That is, the base station apparatus 900 includes an antenna 901, a radio reception unit 902, a separation unit 903, a channel estimation unit 904, a channel compensation unit 905, a demapping unit 906, a decoding unit 907, a scheduling unit 908, an encoding unit 909, and a mapping unit. 910, a multiplexing unit 911, and a wireless transmission unit 912.
- the scheduling unit 908 uses the CQI information notified from each mobile station apparatus, and uses the obtained reception quality for each subchannel of each user to perform a scheduling method such as “Max-CIR” or “Proportional Fairness”. To allocate resources (frequency, time) of each mobile station apparatus in the downlink. Further, scheduling section 908 determines the coding rate and modulation scheme from the communication quality of the allocated resource. Control information (resource allocation, coding rate, and modulation scheme) determined by the scheduling unit is input to the coding unit 909, the mapping unit 910, and the multiplexing unit 911.
- a scheduling method such as “Max-CIR” or “Proportional Fairness”.
- the plurality of mobile station apparatuses notify the relay apparatus of the CQI, and the relay apparatus reduces the number of CQI quantization bits notified by the mobile station apparatus to the base station. Since the notification is made to the apparatus, the amount of CQI information from the relay apparatus to the base station apparatus can be reduced. By allocating resources obtained by reducing CQI to data, it is possible to improve frequency utilization efficiency.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
長谷川亮、Raiz Esmailzadeh、Hoang Nam Nguyen、中川正雄、"固定再生中継装置を用いた適応変調技術に適するマルチホップシステムの検討、"信学技法、RCS2004-210
191 中継装置
191a、191b 中継装置
200 移動局装置
201 符号化部
202 マッピング部
203 多重部
204 CQI生成部
204a サブキャリア品質測定部
204b サブチャネル品質測定部
204c Top-M選択部
204d DCT部
204e サンプル数変更部
205 無線送信部
206 アンテナ
207 無線受信部
208 分離部
209 チャネル推定部
210 チャネル補償部
211 デマッピング部
212 復号部
400 中継装置
401 アンテナ
402 無線受信部
403 分離部
404 多重部
405 CQI圧縮部
406 無線送信部
407 検出部
900 基地局装置
901 アンテナ
902 無線受信部
903 分離部
904 チャネル推定部
905 チャネル補償部
906 デマッピング部
907 復号部
908 スケジューリング部
909 符号化部
910 マッピング部
911 多重部
912 無線送信部
図1は、リソースの使用状況を示す図である。図1に示すように、CQIの情報量を削減した場合、削減したリソースを情報データの通信のためのリソースに用いれば、従来に対して周波数利用効率を向上させることができる。
本実施形態では、中継装置において、中継装置にCQIを通知した少なくとも1つの移動局装置のCQIを、中継装置がCQI情報を削減し、少ない情報量のCQIを基地局装置へ通知する。移動局装置は、第1の実施形態と同様に、図2に示す構成を採る。すなわち、移動局装置200は、符号化部201、マッピング部202、多重部203、CQI生成部204、無線送信部205、アンテナ206、無線受信部207、分離部208、チャネル推定部209、チャネル補償部210、デマッピング部211、復号部212を備え、第1の実施形態と同様に機能する。
本実施形態では、中継装置が複数の移動局装置のCQIを受信し、複数の移動局装置のCQI情報を削減し、少ない情報量のCQIを基地局装置へ通知する。移動局装置は、第1の実施形態と同様に、図2に示す構成を採る。すなわち、移動局装置200は、符号化部201、マッピング部202、多重部203、CQI生成部204、無線送信部205、アンテナ206、無線受信部207、分離部208、チャネル推定部209、チャネル補償部210、デマッピング部211、復号部212を備える。第3の実施形態では、CQI生成部204の構成のみが第1の実施形態と異なる。
本実施形態では、中継装置において、中継装置にCQIを通知した複数の移動局装置のCQIを、中継装置がCQI情報を削減し、少ない情報量のCQIを基地局装置へ通知する。
Claims (13)
- 複数のサブチャネルを用いて制御局装置と端末装置とが無線通信を行なう通信システムに適用され、制御局装置と端末装置との通信を中継する中継装置であって、
前記端末装置からサブチャネルの受信品質を示すチャネル品質情報を受信する受信部と、
前記受信したチャネル品質情報の情報量を圧縮して前記制御局装置へ通知する通知情報を生成する圧縮部と、
前記生成された通知情報を前記制御局装置へ送信する送信部と、を備えることを特徴とする中継装置。 - 前記受信部は、複数の端末装置からチャネル品質情報を受信し、
前記圧縮部は、受信した複数のチャネル品質情報のうち、一部を選択して通知情報を生成することを特徴とする請求項1記載の中継装置。 - 前記圧縮部は、受信品質が良好な順序でチャネル品質情報を選択することを特徴とする請求項2記載の中継装置。
- 前記圧縮部は、各サブチャネルから受信品質が最も良好なチャネル品質情報を優先的に一つずつ選択することを特徴とする請求項2記載の中継装置。
- 前記圧縮部は、各端末装置について選択したチャネル品質情報の個数の差が、所定の値よりも小さくなるようにチャネル品質情報を選択することを特徴とする請求項4記載の中継装置。
- 前記端末装置の移動速度情報を取得する移動速度検出部を更に備え、
前記圧縮部は、前記取得した移動速度が小さい端末装置のチャネル品質情報を優先的に選択することを特徴とする請求項2記載の中継装置。 - 前記端末装置の下りリンクにおけるQoSレベル情報を取得するQoSレベル情報取得部を更に備え、
前記圧縮部は、前記取得したQoSレベルが高い端末装置のチャネル品質情報を優先的に選択することを特徴とする請求項2記載の中継装置。 - 前記受信部は、前記端末装置から、複数チャネルのチャネル品質情報を受信し、
前記圧縮部は、複数チャネルのチャネル品質情報を少なくとも一つのグループにグループ化し、前記グループに属するチャネル品質情報からグループ品質情報を生成し、少なくとも一つのグループ品質情報を選択して通知情報を生成することを特徴とする請求項1記載の中継装置。 - 前記受信部は、前記端末装置から、サブチャネル毎の受信品質を直交変換することによって得られた直交変換受信品質情報を受信し、
前記圧縮部は、前記直交変換受信品質情報の一部を選択して通知情報を生成することを特徴とする請求項1記載の中継装置。 - 前記圧縮部は、前記チャネル品質情報を表す量子化ビット数を減少させて前記通知情報を生成することを特徴とする請求項1記載の中継装置。
- 複数のサブチャネルを用いて、制御局装置と端末装置とが中継装置を介して無線通信を行なう通信システムであって、
前記端末装置は、サブチャネルの受信品質を示すチャネル品質情報を前記中継装置に対して送信し、
前記中継装置は、前記端末装置から受信したチャネル品質情報の情報量を圧縮して通知情報を生成し、生成した通知情報を前記制御局装置へ送信し、
前記制御局装置は、前記中継装置から前記通知情報を受信することを特徴とする通信システム。 - 請求項1から請求項10のいずれかに記載の中継装置と、
サブチャネルの受信品質を示すチャネル品質情報を前記中継装置に対して送信する少なくとも一つの端末装置と、
前記中継装置から情報量が圧縮されたチャネル品質情報を受信する制御局装置と、から構成されることを特徴とする通信システム。 - 複数のサブチャネルを用いて制御局装置と端末装置とが無線通信を行なう通信システムに適用され、制御局装置と端末装置との通信を中継する中継装置の通信方法であって、
受信部において、前記端末装置からサブチャネルの受信品質を示すチャネル品質情報を受信するステップと、
圧縮部において、前記受信したチャネル品質情報の情報量を圧縮して前記制御局装置へ通知する通知情報を生成するステップと、
送信部において、前記生成された通知情報を前記制御局装置へ送信するステップと、を少なくとも含むことを特徴とする通信方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009551526A JP5306237B2 (ja) | 2008-01-30 | 2009-01-28 | 中継装置、通信システムおよび通信方法 |
CN200980103734XA CN101933355A (zh) | 2008-01-30 | 2009-01-28 | 中继装置、通信系统和通信方法 |
US12/865,228 US20110188442A1 (en) | 2008-01-30 | 2009-01-28 | Relay apparatus, communication system and communication method |
EP09705175A EP2242302A1 (en) | 2008-01-30 | 2009-01-28 | Relay device, communication system, and communication method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008019685 | 2008-01-30 | ||
JP2008-019685 | 2008-01-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009096406A1 true WO2009096406A1 (ja) | 2009-08-06 |
Family
ID=40912758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/051319 WO2009096406A1 (ja) | 2008-01-30 | 2009-01-28 | 中継装置、通信システムおよび通信方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110188442A1 (ja) |
EP (1) | EP2242302A1 (ja) |
JP (1) | JP5306237B2 (ja) |
CN (1) | CN101933355A (ja) |
WO (1) | WO2009096406A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011044943A (ja) * | 2009-08-21 | 2011-03-03 | Kddi Corp | 符号化方式選択装置、符号化方式選択方法およびプログラム |
JP2012074873A (ja) * | 2010-09-28 | 2012-04-12 | Kyocera Corp | 基地局と基地局の制御方法 |
JP2012074874A (ja) * | 2010-09-28 | 2012-04-12 | Kyocera Corp | 基地局と基地局の制御方法 |
JP4941615B2 (ja) * | 2009-03-18 | 2012-05-30 | 富士通株式会社 | 中継局、中継方法、基地局、通信方法および通信システム |
WO2015129356A1 (ja) * | 2014-02-28 | 2015-09-03 | 株式会社日立国際電気 | 無線通信端末 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8848521B1 (en) * | 2011-12-22 | 2014-09-30 | Landis+Gyr Technologies, Llc | Channel allocation and device configuration |
DE102022134168A1 (de) | 2022-12-20 | 2024-06-20 | Technische Universität Dresden, Körperschaft des öffentlichen Rechts | Qualitätsbasierte Ressourcenzuordnung in einem Kommunikationsnetzwerk |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005191922A (ja) * | 2003-12-25 | 2005-07-14 | Matsushita Electric Ind Co Ltd | 通信装置、中継装置、および通信方法 |
WO2007023787A1 (ja) * | 2005-08-23 | 2007-03-01 | Nec Corporation | セル間干渉を低減する無線通信方法及びシステム並びにその移動局と基地局 |
WO2007034860A1 (ja) * | 2005-09-22 | 2007-03-29 | Sharp Kabushiki Kaisha | 通信端末装置、通信制御装置、通信システムおよび通信方法 |
JP2007166118A (ja) * | 2005-12-12 | 2007-06-28 | Mitsubishi Electric Corp | チャネル品質伝送方法および端末 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6446122B1 (en) * | 1998-06-24 | 2002-09-03 | Cisco Technology, Inc. | Method and apparatus for communicating quality of service information among computer communication devices |
JP3753698B2 (ja) * | 2003-02-07 | 2006-03-08 | 松下電器産業株式会社 | 無線送信装置および伝送レート決定方法 |
JP4175510B2 (ja) * | 2003-08-29 | 2008-11-05 | ソニー・エリクソン・モバイルコミュニケーションズ株式会社 | 移動体端末、無線中継装置、移動通信システム |
CN100474961C (zh) * | 2003-09-30 | 2009-04-01 | 松下电器产业株式会社 | 用于发送压缩模式中的下行传播路径质量信息的方法和装置 |
JP4354838B2 (ja) * | 2004-02-04 | 2009-10-28 | 三菱電機株式会社 | 通信システム及び通信装置 |
KR20060124401A (ko) * | 2005-05-31 | 2006-12-05 | 삼성전자주식회사 | 무선 통신 시스템에서 중계국을 이용한 스케줄링 방법 및그 시스템 |
KR101119281B1 (ko) * | 2005-08-29 | 2012-03-15 | 삼성전자주식회사 | 무선 통신 시스템에서 채널 품질 정보 피드백 장치 및방법과 이를 이용한 스케줄링 장치 및 방법 |
FR2893861B1 (fr) * | 2005-11-30 | 2008-01-04 | Saint Gobain Ct Recherches | Structure de filtration d'un gaz a base de sic de porosite de surface de paroi controlee |
EP1965529A4 (en) * | 2005-12-20 | 2014-03-05 | Huawei Tech Co Ltd | COMMUNICATION SYSTEM AND BASE STATION AS WELL AS STATIONS USED IN IT |
JP2008054106A (ja) * | 2006-08-25 | 2008-03-06 | Toshiba Corp | 無線通信システム |
JP5251512B2 (ja) * | 2006-10-25 | 2013-07-31 | 富士通株式会社 | 無線基地局,中継局,無線通信システムおよび無線通信方法 |
US8462743B2 (en) * | 2008-01-25 | 2013-06-11 | Nokia Siemens Networks Oy | Method, apparatus and computer program for signaling channel quality information in a network that employs relay nodes |
-
2009
- 2009-01-28 JP JP2009551526A patent/JP5306237B2/ja active Active
- 2009-01-28 EP EP09705175A patent/EP2242302A1/en not_active Withdrawn
- 2009-01-28 CN CN200980103734XA patent/CN101933355A/zh active Pending
- 2009-01-28 WO PCT/JP2009/051319 patent/WO2009096406A1/ja active Application Filing
- 2009-01-28 US US12/865,228 patent/US20110188442A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005191922A (ja) * | 2003-12-25 | 2005-07-14 | Matsushita Electric Ind Co Ltd | 通信装置、中継装置、および通信方法 |
WO2007023787A1 (ja) * | 2005-08-23 | 2007-03-01 | Nec Corporation | セル間干渉を低減する無線通信方法及びシステム並びにその移動局と基地局 |
WO2007034860A1 (ja) * | 2005-09-22 | 2007-03-29 | Sharp Kabushiki Kaisha | 通信端末装置、通信制御装置、通信システムおよび通信方法 |
JP2007166118A (ja) * | 2005-12-12 | 2007-06-28 | Mitsubishi Electric Corp | チャネル品質伝送方法および端末 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4941615B2 (ja) * | 2009-03-18 | 2012-05-30 | 富士通株式会社 | 中継局、中継方法、基地局、通信方法および通信システム |
JP2011044943A (ja) * | 2009-08-21 | 2011-03-03 | Kddi Corp | 符号化方式選択装置、符号化方式選択方法およびプログラム |
JP2012074873A (ja) * | 2010-09-28 | 2012-04-12 | Kyocera Corp | 基地局と基地局の制御方法 |
JP2012074874A (ja) * | 2010-09-28 | 2012-04-12 | Kyocera Corp | 基地局と基地局の制御方法 |
WO2015129356A1 (ja) * | 2014-02-28 | 2015-09-03 | 株式会社日立国際電気 | 無線通信端末 |
JP6009122B2 (ja) * | 2014-02-28 | 2016-10-19 | 株式会社日立国際電気 | 無線通信端末 |
US9572076B2 (en) | 2014-02-28 | 2017-02-14 | Hitachi Kokusai Electric, Inc. | Wireless communication terminal |
Also Published As
Publication number | Publication date |
---|---|
US20110188442A1 (en) | 2011-08-04 |
EP2242302A1 (en) | 2010-10-20 |
JP5306237B2 (ja) | 2013-10-02 |
JPWO2009096406A1 (ja) | 2011-05-26 |
CN101933355A (zh) | 2010-12-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11082181B2 (en) | System and method for orthogonal frequency division multiple access communications | |
CN107113824B (zh) | 在无线局域网中使用半正交多址接入的系统和方法 | |
EP1890413B1 (en) | Method and apparatus for transmitting / receiving feedback information representing channel quality in a MIMO-OFDM system | |
US9055448B2 (en) | Cooperative beamforming apparatus and method in wireless communication system | |
JP5306237B2 (ja) | 中継装置、通信システムおよび通信方法 | |
US9888477B2 (en) | Scheduling apparatus and scheduling method | |
KR20060078880A (ko) | 직교 주파수 분할 다중 접속 통신 시스템에서 부분 채널정보 피드백을 이용한 적응 부채널 및 비트 할당 방법 | |
JP2006191533A (ja) | 通信端末装置、制御局及びマルチキャリア通信方法 | |
WO2010026936A1 (ja) | 無線通信装置及び無線通信システム | |
US20100110986A1 (en) | Base station device, terminal device, communication system and communication method | |
JP2008054106A (ja) | 無線通信システム | |
US8422443B2 (en) | Base station apparatus, terminal apparatus and communication system | |
TW202125996A (zh) | 基於發射器的鏈路自我調整 | |
JP5361872B2 (ja) | 無線受信装置、無線送信装置及びフィードバック方法 | |
JP5153781B2 (ja) | 通信装置、マルチキャリア通信システムおよび通信方法 | |
US20080259854A1 (en) | Communication Terminal Apparatus, Base Station Apparatus, and Resource Assigning Method | |
EP2187539B1 (en) | Base station apparatus and uplink sinr measuring method | |
JP2007189360A (ja) | 通信制御装置、通信端末装置、及び、通信制御方法 | |
JP4898818B2 (ja) | 無線通信装置、無線通信システムおよび無線通信方法 | |
JP5105622B2 (ja) | 無線通信装置、無線通信システム、無線通信方法、報告情報送信方法およびスケジューリング方法 | |
KR100877746B1 (ko) | Ofdma기반의 무선통신 시스템에서 맵 구성 방법 및이를 이용한 프레임 전송 장치 | |
KR101037345B1 (ko) | 무선통신시스템에서 피드백 채널 운영 장치 및 방법 | |
JP4920609B2 (ja) | 無線通信装置 | |
JP2009065353A (ja) | 通信装置及び通信方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980103734.X Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09705175 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2009551526 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2009705175 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12865228 Country of ref document: US |