WO2007055292A1 - 無線送信装置及び無線送信方法 - Google Patents
無線送信装置及び無線送信方法 Download PDFInfo
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- WO2007055292A1 WO2007055292A1 PCT/JP2006/322393 JP2006322393W WO2007055292A1 WO 2007055292 A1 WO2007055292 A1 WO 2007055292A1 JP 2006322393 W JP2006322393 W JP 2006322393W WO 2007055292 A1 WO2007055292 A1 WO 2007055292A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0004—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to a wireless transmission device and a wireless transmission method in an OFDM (Orthogonal Frequency Division Multiplexing) system.
- OFDM Orthogonal Frequency Division Multiplexing
- OFDM is one of wireless transmission technologies that can meet such demands.
- OFDM is a multi-carrier transmission technology that transmits data in parallel using a large number of subcarriers, and has features such as high frequency utilization efficiency and reduced inter-symbol interference in a multipath environment, and is effective in improving transmission efficiency. It is known that
- Non-Patent Document 1 It has been studied to perform frequency scheduling when this OFDM is used in the downlink and data for a plurality of mobile stations is frequency-multiplexed onto a plurality of subcarriers.
- a base station adaptively allocates subcarriers to each mobile station based on the reception quality of each frequency band at each mobile station. For this reason, the maximum multi-user diversity gain can be obtained, and communication can be performed very efficiently.
- Non-Patent Document 1 The data (for example, voice, data, and image) of each mobile station whose assignment is determined by frequency scheduling is transmitted through a common channel (Shared Channel). Also, the transmission parameters (eg, allocated RB (Resource Block) number, allocated mobile station ID, MCS (Modulation and Coding Scheme)) of data transmitted on a common channel are shared control channel (Shared Control Channel) for each mobile station. (Hereinafter referred to as “SCCH”) is being studied (see Non-Patent Document 1).
- Non-Patent Document 1 R1— 050590, "Physical Channels and Multiplexing in Evolved UTRA D ownlink", NTT DoCoMo, 3GPP TSG-RAN WG1, 2005/06
- An object of the present invention is to provide a radio transmission apparatus and a radio transmission method that accommodate many mobile stations that receive low-rate data and avoid a decrease in system throughput. Means for solving the problem
- a radio transmission apparatus performs frequency scheduling for a mobile station apparatus, assigns resource blocks, which are control units of frequency scheduling, to the mobile station apparatus, and a plurality of conditions satisfying a predetermined condition Grouping means for grouping mobile station devices as low-rate UEs that receive low-rate data, and assigning a group ID to each grouped low-rate UE, and common control for generating a common control channel including the group ID Channel control means, control information generating means for generating control information indicating allocation information of resource blocks assigned to the low-rate UE, the common control channel, data and the control information are multiplexed, and the control information is A multiplexing means for multiplexing the data area of the resource block to which the low rate data is allocated; It adopts a configuration and a transmitting unit that sends No..
- the radio transmission method of the present invention performs frequency scheduling for a mobile station device, assigns a resource block, which is a control unit of frequency scheduling, to the mobile station device, and a plurality of conditions satisfying a predetermined condition
- a mobile station apparatus is grouped as a low-rate UE that receives low-rate data, and a grouping step for assigning a group ID to each grouped low-rate UE, a common control channel including the group ID, and the low-rate UE Control information and data indicating allocation information of allocated resource blocks And a multiplexing step of multiplexing the control information in a data area of a resource block to which the low-rate data is allocated.
- FIG. 1 is a block diagram showing a configuration of a transmission apparatus according to Embodiments 1, 3, and 5 of the present invention.
- FIG. 2 Low-rate UE criteria for the group ID assignment unit shown in Fig. 1
- FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram showing an SCCH format generated by the SCCH processing unit shown in FIG.
- RB power for allocating high-rate receiving UEs also shows how SCCH of low-rate UEs is reduced
- FIG.10 Diagram showing how multiple low-rate UEs are placed in one RB
- FIG. 11 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 2 of the present invention.
- FIG. 12 A diagram showing an arrangement of signals in which each physical channel is multiplexed.
- FIG. 13 A diagram showing an arrangement of signals in which each physical channel is multiplexed.
- FIG. 14 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 4 of the present invention.
- FIG. 1 is a block diagram showing a configuration of transmitting apparatus 100 according to Embodiment 1 of the present invention.
- an error correction code unit 101 performs error correction coding on transmission data at a coding rate output from an MCS setting unit 107 described later, and an S / P (serial Z parallel) unit 102. Output to.
- the SZP unit 102 converts the serial code data output from the error correction code key unit 101 into parallel code data of a plurality of sequences in accordance with the data size that can be transmitted for each RB.
- the code key data of each series is output to modulation sections 103-l to 103-n, respectively.
- Modulating sections 103-1 to 103-n modulate data for each RB according to the modulation scheme output from MCS setting section 107, and generate data symbols, according to the modulation scheme output from SCS section 102, The generated data symbols are output to the corresponding repetition units 104-l to 104-n. Note that the modulation units 103-1 to 103-n are provided for the number n of RBs included in one OFDM symbol.
- Repetition sections 104-l to 104-n perform symbol repetition for each RB according to the number of repetitions output from MCS setting section 107 for the data symbols output from modulation sections 103-l to 103-n. Output to multiplexing section 117. Note that repetition units 104-1 to 104-n are provided by the number n of resource blocks included in the lOFDM symbol.
- CQI extraction section 105 acquires feedback information transmitted from receiving apparatus 200 described later, and also extracts the CQI information from the acquired feedback information power.
- the extracted CQI information is output to the RB allocation unit 106 and the MCS setting unit 107.
- the RB allocating unit 106 assigns a mobile station (hereinafter referred to as a UE) to an RB using an arbitrary scheduling method (for example, Max CIR method, Proportional Fairness method). Assign to.
- the RB assigning unit 106 outputs the ID (assigned UE—ID) and assigned RB number of the UE to which the RB is assigned to the MCS setting unit 107 and the group ID assigning unit 108.
- the MCS setting unit 107 receives the received packet error rate for each UE. Determine the maximum MCS parameters (code rate of error correction code, modulation method, number of repetitions) that will be 0.1 or less.
- the determined code rate is output to the error correction code section 101
- the modulation scheme is output to the modulation sections 103-1 to 103-n
- the number of repetitions is output to the repetition sections 104-1 to 104-n. Is output.
- the determined MCS parameter is output to group ID assigning section 108 and SCCH processing section 109.
- the group ID assigning unit 108 uses, for example, the allocation UE-ID and the allocated RB number output from the RB allocation unit 106 and the MCS parameter output from the MCS setting unit 107, as shown in FIG.
- Each UE is a UE that receives low rate data (hereinafter referred to as “low rate UE”) and a UE that receives high rate data (hereinafter referred to as “high rate UE”). Determine if there is.
- Group ID assigning section 108 groups a plurality of UEs determined to be low-rate UEs, and assigns a group ID to the grouped UEs.
- the grouped UE's assigned UE ID (hereinafter referred to as “low rate UE ID”) is changed to the assigned group ID.
- the assigned group ID, low-rate UE—ID and assigned RB number are output to SCCH processing section 109.
- the low rate UE-ID and the assigned RB number are output to the low rate control information processing unit 113.
- SCCH processing section 109 includes SCCH generation section 110, error correction coding section 111, and modulation section 112.
- SCCH generation section 110 combines the MCS parameters output from MCS setting section 107 with the low-rate UE ID and allocation RB number output from group ID assignment section 108 to generate and generate SCCH information.
- the SCCH information is output to the error correction code field unit 111.
- the error correction code key unit 111 applies the error correction code key to the SCCH information
- the modulation unit 112 modulates the code key data of the SCCH information and outputs it to the multiplexing unit 117.
- the code rate in error correction coding section 111 and the modulation scheme in modulation section 112 are determined in advance, and are not limited to a specific coding rate and a specific modulation scheme.
- the low-rate control information processing unit 113 includes a low-rate control information generation unit 114, an error correction code encoding unit 115, and a modulation unit 116.
- the low-rate control information generation unit 114 generates low-rate control information by combining the low-rate UE—ID output from the group ID assigning unit 108 and the assigned RB, and outputs the low-rate control information to the error correction code unit 115. To do.
- Error correction coding section 115 applies error correction code to the low-rate control information, and modulation section 116 modulates the code data of the low-rate control information and outputs it to multiplexing section 117.
- the error correction encoding unit 115 The code rate and the modulation scheme in modulation section 116 are determined in advance.
- Multiplexer 117 includes pilot channels, SCCH output from SCCH processing unit 109, low-rate control channel output from low-rate control information processing unit 113, and revision units 104-l to 104 -n.
- the output data symbols are multiplexed and the multiplexed signal is output to IF T section 118.
- the low-rate control channel is multiplexed at the head of the data channel area of the RB to which the low-rate UE is assigned.
- IFFT section 118 performs IFFT (Inverse Fast Fourier Transform) processing on the multiplexed signal output from multiplexing section 117, thereby transforming from the frequency domain to the time domain to generate an OFDM symbol that is a multi-carrier signal. To do.
- the generated OFDM symbol is output to the GI-added calo unit 119.
- GI adding section 119 attaches the same signal as the tail part of the OFDM symbol output from IFFT section 118 to the beginning of the OFDM symbol as a GI (Guard Interval), and outputs it to transmission RF section 120.
- GI Guard Interval
- Transmission RF section 120 performs transmission processing such as DZA conversion, amplification and up-conversion on the OFDM symbol output from the GI-attached section, and receives the signal subjected to the transmission processing from antenna 121, which will be described later. Send to 200.
- FIG. 3 is a block diagram showing a configuration of receiving apparatus 200 according to Embodiment 1 of the present invention.
- a reception RF section 202 receives an OF DM symbol transmitted from the transmission apparatus 100 shown in FIG. 1 via an antenna 201, and performs down-conversion, AZD conversion, etc. on the received OFDM symbol. Are received and output to the GI removal unit 203.
- GI removal section 203 removes the GI attached to the OFDM symbol and outputs the result to FFT section 204.
- FFT section 204 performs FFT (Fast Fourier Transform) processing on the OFDM symbol output from GI removal section 203 to convert from the time domain to the frequency domain, and converts the pilot signal and other received signals. obtain.
- the pilot signal is output to channel estimation section 205, and the other received signals are output to equalization section 206.
- Channel estimation section 205 is a pilot signal for each subcarrier output from FFT section 204. The channel estimation is performed for each subcarrier using the signal, and the channel estimation value is output to the equalization unit 206 and the CQI generation unit 220. Further, channel estimation section 205 detects the signal power value (S), interference power value (I), and noise power value (N) of the pilot signal for each subcarrier, and sends the SI NR value to CQI generation section 220. Output.
- S signal power value
- I interference power value
- N noise power value
- Equalization section 206 performs equalization processing on the received signal output from FFT section 204 using the channel estimation value output from channel estimation section 205, and outputs the result to demultiplexing section 207.
- Separating section 207 separates the received signal output from equalizing section 206 into received data, SCCH, and a low-rate control channel, and receives the received data for each RB by symbol combining sections 212-1 to 212 —. output to n, output SCCH to SCCH receiver 208, and output low-rate control channel to low-rate control information receiver 216. However, the low-rate control channel is separated from the received data according to the allocation RB number of the low-rate allocation control channel input from the SCC H receiving unit 208.
- SCCH reception unit 208 includes symbol synthesis unit 209, demodulation unit 210, and error correction decoding unit 211.
- Symbol combining section 209 performs symbol combining on the SCCH output from demultiplexing section 207
- demodulating section 210 demodulates the symbol combined SCCH
- error correction decoding section 211 decodes the demodulated SCCH and assigns the assigned RB. Get the number, timing slot and MCS parameters for this assigned RB.
- the own apparatus is a low-rate UE
- the allocated RB number of the low-rate control channel included in SCC H is output to separation section 207.
- demodulation processing and error correction decoding processing are performed in accordance with predetermined MCS parameters, and the coding rate of error correction coding section 111 and the modulation scheme of modulation section 112 of transmitting apparatus 100 shown in FIG. Speak correspondingly.
- Symbol combining sections 212-1 to 212-n include the MCS output from SCCH receiving section 208, among the received data output from separating section 207, the symbols duplicated by repetition and the original symbols. Symbols are combined according to the parameters (number of levitations) and output to the corresponding demodulation sections 213-1 to 213-n, respectively. Symbol combining sections 212-1 to 212-n are provided by the number n of resource blocks included in the lOFDM symbol.
- Demodulation sections 213-1 to 213-n follow the MCS parameters (modulation scheme) output from SCCH reception section 208 using the combined symbols output from symbol combining sections 212-1 to 212-n.
- the signal is demodulated and output to the PZS unit 214.
- the demodulation units 213-1 to 213-n are provided by the number n of resource blocks included in the lOFDM symbol.
- PZS section 214 converts the parallel data symbols output from demodulation sections 213-l to 213-n into serial data, and outputs the result to error correction decoding section 215.
- Error correction decoding unit 215 performs error correction decoding on the data symbols output from PZS unit 214 in accordance with the MCS nomometer (code rate) output from SCCH receiving unit 208. As a result, received data is obtained.
- the low-rate control information reception unit 216 includes a symbol synthesis unit 217, a demodulation unit 218, and an error correction decoding unit 219.
- the symbol synthesis unit 217 performs symbol synthesis on the low-rate control information output from the separation unit 207
- the demodulation unit 218 demodulates the symbol-synthesized low-rate control information
- the error correction decoding unit 219 performs demodulation.
- Low-rate control information is error-corrected and decoded. As a result, the assigned RB number of the own device is recognized.
- CQI generating section 220 generates CQI indicating the SINR value for each RB output from channel estimating section 205.
- the generated CQI is encoded in the error correction code encoding unit 221, modulated in the modulation unit 222, and subjected to transmission processing such as DZA conversion, amplification and up-conversion in the transmission RF unit 223, and then the antenna.
- the data is transmitted from 201 to the transmitting apparatus 100 shown in FIG.
- FIG. 4 shows the arrangement of signals in which each physical channel (pilot channel, SCCH, common data channel, low-rate control channel) is multiplexed.
- the number of RBs is 8, the number of low-rate UEs is 4 (UE—1 to 4), the number of high-rate UEs is 3 (UE—5 to 7), the number of MCS levels is 4, and the RB allocation unit 106 If low rate UEs (UE 1-4) are assigned to RB-1 and high rate UEs (UE—5-7) are assigned to RB-2 to RB-8, low rate UEs are assigned as shown in FIG.
- the low-rate control channel is multiplexed at the beginning of the allocated RB-1 data channel area.
- FIG. 5 shows an SCCH format generated by SCCH processing section 109 shown in FIG. 1, and FIG. 6 shows allocation information in SCCH.
- UE8 shown in FIG. 5 and FIG. 6 is obtained by replacing the low-rate UE—ID (UE—1 to 4) for 4 UEs with the group ID of the low-rate group by the group ID assigning unit 108. .
- the UE UE ID assigned to the UE that receives the low rate data allocated to the RB allocation unit 106 power B is based on the SCCH. Is notified as a group ID.
- TS Transmission Slot
- FIG. 7 indicates the allocation resource area of RB-1 in FIG. 4, and indicates that UE-1 is assigned to TS-1 and UE-2 is assigned to TS-2. Also, UE-3 is assigned to TS-3, UE-4 is assigned to TS-4, and this is shown.
- the RB power to allocate the high-rate UE can reduce the SCCH of the low-rate UE.
- Fig. 8 the area surrounded by the dotted line can be improved as the area to which the high rate U E is assigned.
- Embodiment 1 As described above, according to Embodiment 1, UEs that receive low rate data are grouped, frequency allocation is performed using a group ID, and low rate UEs are allocated to RBs that allocate low rate data. By arranging the control information indicating the slot, the data area of the RB to which high rate data is allocated can be improved, so that it is possible to avoid a decrease in system throughput while accommodating many low rate UEs.
- the same code is used instead of coding each assigned TS number and UE ID for each RB. It is also possible to sign together by the conversion rate. As a result, a larger code gain can be obtained, and the error rate of the low-rate control information can be improved.
- the relative value (difference information) of the MCS notified by SCCH may be notified by the low-rate control information.
- the receiving apparatus can perform reception processing using MCS parameters according to the channel characteristics, and thus the throughput of the low-rate UE can be improved.
- the low-rate UEs are grouped, and the RB to which the low-rate UE group is assigned is reported by SCCH. Then, notify the MCS of each low-rate UE using the low-rate control information.
- FIG. 11 is a block diagram showing a configuration of transmitting apparatus 300 according to Embodiment 2 of the present invention.
- the CQI extraction unit 301 acquires the feedback information transmitted as well as the receiving device power, extracts the CQI information from the acquired feedback information power, and uses the extracted CQI information as the RB allocation unit 106, MCS setting unit 107, low Output to rate control information allocation section 303.
- This CQI information notifies the reception characteristics of each RB estimated by each UE by SINR or MCS.
- Group ID assigning section 302 uses the allocated UE-ID and allocated RB number output from RB allocation section 106 and the MCS parameter output from MCS setting section 107 to allow each UE to transmit low rate data. It is determined whether the UE is a UE that receives high-rate data and power that is a UE that receives it. Group ID assigning section 302 groups a plurality of UEs determined as low-rate UEs, and assigns a group ID to the grouped UEs. For low rate UEs, the assigned group ID, low rate UE—ID and assigned RB number are output to SCCH processing section 109, and for high rate UEs, the assigned UE—ID and assigned RB number are output to SCCH processing section 109. Further, the low rate U E ID and the allocated RB number are output to the low rate control information processing unit 113 and the low rate control information allocation unit 303.
- Low-rate control information allocating section 303 obtains the reception characteristics of each RB output from group ID assigning section 302 as well as the CQI information power output from CQI extracting section 301, and each low-rate UE power is also transmitted.
- the RB that has the best reception characteristics due to the most CQI information is determined to be the RB with the best reception characteristics, and the low-rate control information is allocated together.
- the allocation information (allocation RB number) of the control information for low rate is output to SCCH processing section 109.
- the low-rate UE—ID is controlled together with the new assigned RB number.
- the information is output to the information processing unit 113.
- FIG. 12 shows an arrangement of signals in which each physical channel (pilot channel, SCCH, common data channel, low-rate control channel) is multiplexed.
- SCCH pilot channel
- SCCH common data channel
- UE 9-11 the number of MCS levels is 4.
- SCCH the assigned RB number, assigned UE ID, and MCS shall be reported.
- low rate control information is assigned to RB-1 with the best reception characteristics.
- RB-1 and RB-1 adjacent to RB-1 are assigned low rate UEs (UE-1-8), and RB-3 to RB-8 are high rate UEs (UE-9-11) Indicate the case where is assigned.
- UE-9-11 high rate UEs
- a low-rate control channel is multiplexed together at the beginning of the RB-1 data channel region with the best reception characteristics. Note that in RB-1 and RB-2 in Fig. 12, the power assigned so that the UE-ID and the timing number are the same is not limited to this assignment.
- the error rate of the low-rate control information can be improved by arranging the low-rate control information together in the RB with the best reception quality.
- the power described for the case where there is one RB to which the low-rate UE with the best reception quality is assigned.
- the low-rate UE is assigned to the plurality of RBs.
- the control information may be divided and arranged.
- the configuration of the transmission apparatus according to Embodiment 3 of the present invention has the same configuration as that of transmission apparatus 100 according to Embodiment 1 with only a partial difference in function, and will be described with reference to FIG.
- the group ID assigning unit 108 Based on the MCS parameters output from the MCS setting unit 107, the group ID assigning unit 108, based on the condition that all the low rate UEs assigned to the same RB are the same MCS. Group low-rate UEs and assign group IDs to the grouped UEs.
- FIG. 13 shows an arrangement of signals in which each physical channel (pilot channel, SCCH, common data channel, control channel for low rate) is multiplexed.
- SCCH pilot channel
- SCCH common data channel, control channel for low rate
- the number of RBs is 8
- the number of low rate UEs is 8 (UE—1 to 8)
- the number of high rate UEs is 3 (UE—9 to 11)
- the number of MCS levels is 4.
- SCCH the assigned RB number, assigned UE ID, and MCS shall be reported.
- the low-rate UEs 1 to 8 are grouped because they are the same MCS, and this MCS is notified by SCCH. Control information can be reduced.
- RB-1 and RB-2 in Fig. 13 the power assigned so that the UE-ID and the timing number are the same. It is not something.
- the receiving apparatus reports the moving speed of the receiving apparatus together with the received signal level as CQI to the transmitting apparatus.
- FIG. 14 is a block diagram showing a configuration of transmitting apparatus 400 according to Embodiment 4 of the present invention.
- the CQI extraction unit 401 acquires information indicating the moving speed of the receiving apparatus included in the feedback information as well as the receiving information, and extracts the CQI information and the moving speed information for the feedback information power.
- the CQI extraction unit 401 outputs the extracted CQI information to the RB allocation unit 106 and the MCS setting unit 107, while outputting the moving speed information to the group ID assigning unit 402.
- group ID assigning section 402 determines that all the low rate UEs assigned to the same RB are moving speeds within a certain range. As a condition, these low-rate UEs are grouped, and group IDs are assigned to the grouped UEs.
- the configuration of the transmission apparatus according to Embodiment 5 of the present invention has the same configuration as that of transmission apparatus 100 according to Embodiment 1 with only a partial difference in function, and will be described with reference to FIG.
- SCCH processing section 109 generates an SCCH including a low-rate UE allocation rule in each TTI included in this frame within the TTI at the beginning of the frame.
- an allocation rule for low-rate UEs for example, in each, RBs allocated to high-rate UEs Among other RBs, low rate UEs to be assigned in ascending order of RB numbers can be specified.
- FIG. 15 shows an arrangement of signals in which each physical channel (pilot channel, SCCH, common data channel, control channel for low rate) is multiplexed.
- SCCH pilot channel
- SCCH common data channel, control channel for low rate
- the number of RBs is 8
- the number of low rate UEs is 4 (UE-1 to 4)
- the number of high rate UEs is 3 (UE-5 to 7)
- the number of MCS levels is 4.
- SCCH the assigned RB number, assigned UE ID, and MCS shall be reported.
- FIG. 15 shows a state in which a low-rate UE allocation rule is included in SCCH and multiplexed at TTI # 1 at the beginning of the frame.
- the allocation rule stipulates that, among RBs other than RBs allocated to high-rate UEs, low-rate UEs 4, 1, 2, and 3 are allocated in ascending order of RB numbers.
- RB—2, 3, 7, 8 is assigned to the high-rate UE, so the remaining RB—1 is assigned to the low-rate UE—4 and RB—4 is assigned. It is assigned to low rate UE-1, RB-5 is assigned to low rate UE-2, and RB-6 is assigned to low rate UE-3.
- Embodiment 4 by multiplexing the SCHCH including the allocation rule for the low-rate UE in the frame at the top of the frame, the low rate is transmitted at the other frame in the same frame. Since the control information can be reduced, the low-rate data can be increased, so that the throughput can be improved.
- Each functional block used in the description of each of the above embodiments is typically an integrated circuit. It is realized as an LSI. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Here, it is sometimes called IC, system LSI, super LSI, or ultra LSI, depending on the difference in power integration.
- circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- An FPGA Field Programmable Gate Array
- reconfigurable 'processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.
- the radio transmission apparatus and radio transmission method according to the present invention can accommodate a large number of mobile stations that receive low-rate data, can avoid a reduction in system throughput, and can be applied to radio communication base station apparatuses and the like. .
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Abstract
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US12/092,542 US7733977B2 (en) | 2005-11-10 | 2006-11-09 | Radio transmission device and radio transmission method |
EP06832454A EP1928113A1 (en) | 2005-11-10 | 2006-11-09 | Radio transmission device and radio transmission method |
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EP (1) | EP1928113A1 (ja) |
JP (1) | JP4757878B2 (ja) |
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US7733977B2 (en) | 2010-06-08 |
JP4757878B2 (ja) | 2011-08-24 |
EP1928113A1 (en) | 2008-06-04 |
CN101305538A (zh) | 2008-11-12 |
US20090238123A1 (en) | 2009-09-24 |
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