WO2011108242A1 - 無線通信装置及びデータ再配置方法 - Google Patents
無線通信装置及びデータ再配置方法 Download PDFInfo
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- WO2011108242A1 WO2011108242A1 PCT/JP2011/001127 JP2011001127W WO2011108242A1 WO 2011108242 A1 WO2011108242 A1 WO 2011108242A1 JP 2011001127 W JP2011001127 W JP 2011001127W WO 2011108242 A1 WO2011108242 A1 WO 2011108242A1
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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
- 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
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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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- the present invention relates to a radio communication apparatus and a data rearrangement method for spatially multiplexing and transmitting a signal obtained by multiplexing a plurality of different data groups to a communication terminal.
- the MU-MIMO scheme is a scheme in which a base station having a plurality of antennas communicates with a plurality of communication terminals having a plurality of antennas (hereinafter simply referred to as “terminals”). According to this scheme, the base station allocates resources to terminals and transmits different signals for each directivity to a plurality of terminals.
- the base station performs channel adaptive scheduling.
- a base station that performs channel adaptive scheduling basically allocates resources in the time direction and the frequency direction in units of blocks to terminals having good channel conditions.
- a base station that employs the MU-MIMO scheme also allocates resources in the spatial direction in addition to the allocation of resources in the time direction and the frequency direction.
- the data size transmitted from the base station to the terminal may be different for each terminal. Also, as described above, in channel adaptive scheduling, a terminal is selected according to the channel state. Therefore, the data sizes transmitted to a plurality of terminals to which communication opportunities are given do not always match. As a result, a resource allocated to a terminal having a small data size includes an empty resource block without actual data.
- FIG. 12 is a diagram illustrating an example of data allocated to a logical resource block in the frequency direction, which is transmitted to each of two terminals by a base station adopting the MU-MIMO scheme.
- four VRBs Virtual Resource Blocks
- VRB is a data allocation unit before data arrangement, which will be described later.
- the data size of the data transmitted to the terminal # 1 is four VRBs, but the data size of the data transmitted to the terminal # 2 is two VRBs.
- an empty resource block is generated in the resource.
- FIGS. 13A and 13B are diagrams illustrating an example of data transmitted to each terminal allocated to PRB (Physical Resource Block) in the time direction and the frequency direction.
- FIG. 13A shows data transmitted to the terminal # 1
- FIG. 13B shows data transmitted to the terminal # 2.
- the data allocated to each VRB of each terminal is arranged on the PRB corresponding to the VRB in the frequency direction on a one-to-one basis for each terminal.
- the PRB is a data allocation unit after data arrangement, and is composed of a plurality of frequency and time resource blocks. For example, as shown in FIG. 13B, it is composed of 18 subcarriers in the frequency direction and 6 symbols in the time direction. Also, when data is arranged on the PRB, pilot symbols are inserted at different positions for each terminal.
- signal waveforms are distorted due to the influence of multipath fading on a propagation channel (hereinafter simply referred to as “channel”).
- channel a propagation channel
- the terminal In order for the terminal to correctly decode the signal transmitted from the base station, the terminal needs to estimate the channel and compensate the signal.
- the base station transmits pilot symbols that are known to both the base station and the terminal. A plurality of pilot symbols are arranged in each PRB at equal intervals in the time direction or the frequency direction.
- FIG. 14 is a diagram illustrating an example of data in which data of each terminal illustrated in FIGS. 13A and 13B is multiplexed.
- a plurality of pilot symbols for each terminal to be multiplexed are arranged at equal intervals in the time direction or the frequency direction.
- the channel estimation is performed by performing interpolation processing such as weighting and averaging on the channel fluctuation amount estimated using pilot symbols, and the channel of data existing between pilot symbols is represented by the resource element (Resource ⁇ ⁇ ⁇ ⁇ ⁇ Element :) shown in FIG. This is an estimation process for each RE).
- Patent Document 1 does not employ the MIMO method, and assumes communication with one terminal. Further, Patent Document 1 does not disclose an empty resource block.
- the accuracy of channel estimation performed on the terminal side is better for data of resource elements close to pilot symbols in both time and frequency directions. In other words, the channel estimation accuracy decreases as the distance from the pilot symbol increases.
- pilot symbols are inserted into all PRBs regardless of whether or not data is allocated to PRBs, as shown in FIGS. 13A and 13B and FIG.
- data is not allocated to the two right PRBs (empty resource blocks), but pilot symbols are arranged at regular intervals in both directions of the frequency.
- data to be transmitted to terminal # 2 is not allocated in the vicinity of the pilot symbols inserted in the two right PRBs. For this reason, some pilot symbols are not effectively utilized. That is, part of the opportunity to use the pilot symbol function is lost.
- An object of the present invention is to provide a radio communication apparatus and a data rearrangement method that fully utilize the functions of all pilot symbols and improve error rate characteristics.
- the present invention is a wireless communication apparatus for transmitting a signal obtained by multiplexing a plurality of data groups having different sizes to a communication terminal, and among the plurality of data groups to which a predetermined number of resource blocks in the time direction and the frequency direction are allocated, An empty resource block detection unit that detects empty resource blocks in a data group that does not use all the predetermined number of resource blocks, and a data group to which resources including empty resource blocks are allocated There is provided a radio communication apparatus comprising: a data rearrangement unit that rearranges a part thereof in the vicinity of a pilot symbol provided in the empty resource block.
- the present invention is a data rearrangement method performed by a wireless communication apparatus that spatially multiplex-transmits a signal in which a plurality of data groups having different sizes are multiplexed to a communication terminal, and a predetermined number of resource blocks in the time direction and the frequency direction are allocated.
- a predetermined number of resource blocks in the time direction and the frequency direction are allocated.
- an empty resource block of a data group that does not use all the predetermined number of resource blocks is detected, and the data group to which a resource including the empty resource block is allocated is arranged in the resource block.
- the radio communication apparatus and data relocation method according to the present invention can fully utilize the functions of all pilot symbols and improve the error rate characteristics.
- the block diagram which shows the structure of the base station of 1st Embodiment. Diagram showing how to select data to be relocated The block diagram which shows the structure of the terminal of 1st Embodiment.
- (A) And (b) is a figure which shows an example of the data transmitted to each terminal allocated to PRB after data rearrangement was performed.
- (A) And (b) is a figure which shows the other example of the data transmitted to each terminal allocated to PRB after data rearrangement was performed, (a) is transmitted to terminal # 1
- (B) is data transmitted to the terminal # 2.
- the estimation accuracy of each channel, the interference from the channel of the terminal # 2 in the channel of the terminal # 1, and the terminal # 1 in the example shown in FIGS. Diagram showing SINR distribution FIG.
- FIG. 14 is a diagram illustrating the estimation accuracy of each channel, the interference from the channel of terminal # 2 in the channel of terminal # 1, and the SINR distribution of terminal # 1 in the example illustrated in FIG. 14 where data rearrangement is performed
- the graph which shows the influence which the channel estimation precision according to the number of empty RBs of terminal # 2 and the power loss of control data have on SINR
- the figure which shows the relationship of the signaling bit which shows the number of allocated resource blocks, the number of empty resource blocks, and a rearrangement pattern when the upper limit of a signaling bit is restrict
- a communication system to be described below includes a base station having a plurality of antennas and a plurality of communication terminals (hereinafter simply referred to as “terminals”) having a plurality of antennas.
- MU-MIMO MultiUser-MIMO
- the base station allocates resources in blocks in the spatial direction in addition to the time direction and the frequency direction to terminals having good channel conditions, and transmits different signals for each directivity to a plurality of terminals.
- the number of multiplexing in this communication system is two.
- data to be transmitted to the terminal # 1 and data to be transmitted to the terminal # 2 are multiplexed in the signal transmitted from the base station to the terminal.
- the data size transmitted to the terminal # 2 is smaller than the data size transmitted to the terminal # 1.
- FIG. 1 is a block diagram illustrating a configuration of a base station according to the first embodiment.
- the base station according to the first embodiment includes a scheduling unit 101, an empty resource block detection unit (empty RB detection unit) 103, a rearrangement pattern determination unit 105, a control data generation unit 107, , Control data encoding section 109, control data modulating section 111, encoding section 113, modulating section 115, data arranging section 117, data rearranging section 119, MIMO multiplexing section 121, and OFDM modulating section 123.
- FB data demodulator feedback data demodulator
- FB data decoder feedback data decoder
- the scheduling unit 101 selects a terminal from which the base station transmits data, based on CQI (Channel Quality Information) included in feedback data transmitted from each terminal.
- the scheduling unit 101 performs channel adaptive scheduling that allocates a communication opportunity to a terminal having a good channel SINR (Signal-to-Interference-and-Noise-power-Ratio) characteristic.
- SINR Signal-to-Interference-and-Noise-power-Ratio
- the empty RB detection unit 103 compares the data size to be transmitted to each terminal and detects the number of empty resource blocks (empty RBs) of each terminal.
- An empty resource block is a resource block that does not include actual data.
- the rearrangement pattern determination unit 105 rearranges the data allocated on the PRB (Physical Resource Block) based on the number of resource blocks allocated to the terminal # 2 and the number of empty resource blocks of the terminal # 2. (Relocation pattern) is determined.
- the data to be rearranged in the rearrangement pattern determination unit 105 is preferentially selected from data of resource elements that are farthest from the pilot symbols in the time direction and the frequency direction.
- FIG. 2 is a diagram showing a method for selecting data to be rearranged.
- the interval between adjacent subcarriers is indicated by the symbol a.
- the data to be rearranged is a distance of 3a.
- the former resource element is selected with priority.
- the rearrangement pattern determination unit 105 may select data to be rearranged according to the channel fluctuation situation in the time direction or the frequency direction, not limited to the distance in both the time and frequency directions. For example, when the channel variation in the frequency direction is larger than the channel variation in the time direction, the rearrangement pattern determination unit 105 preferentially selects from data of resource elements that are farthest from the pilot symbol in the frequency direction. On the contrary, when the channel variation in the time direction is larger than the channel variation in the frequency direction, the rearrangement pattern determination unit 105 preferentially selects from data of resource elements that are farthest from the pilot symbol in the time direction.
- a channel correlation value between subcarriers may be used as an index when selecting data to be rearranged.
- data arranged on a subcarrier having a small channel correlation value with a subcarrier on which a pilot symbol is arranged is preferentially selected.
- the rearrangement pattern determination unit 105 tabulates the rearrangement patterns corresponding to each relationship and stores them in the memory.
- the control data generation unit 107 includes information such as scheduled CQI, layer (information regarding the number of multiplexed data of MIMO, “2” in the present embodiment), MIMO transmission weight, rearrangement pattern, and the like. Generate control data.
- the encoding unit 113 performs error correction encoding according to the encoding rate input from the control data generation unit 107.
- Modulation section 115 digitally modulates the encoded data according to the modulation level input from control data generation section 107.
- the data arrangement unit 117 arranges modulation data and pilot symbols for channel estimation at equal intervals in the time direction or the frequency direction in each PRB corresponding to VRB (Virtual Resource Block) in the frequency direction.
- Data rearrangement section 119 rearranges a part of the actual data to be transmitted to terminal # 2 in the vicinity of the pilot symbol in the empty resource block according to the rearrangement pattern input from rearrangement pattern determination section 105. Note that the data rearrangement unit 119 does not perform rearrangement processing on the actual data transmitted to the terminal # 1. Details of the rearrangement performed by the data rearrangement unit 119 will be described later.
- the MIMO multiplexing unit 121 multiplies data to be transmitted to each terminal by a MIMO transmission weight, and adds and multiplexes each data.
- the OFDM modulation unit 123 performs inverse fast Fourier transform on the multiplexed data to generate an OFDM (Orthogonal Frequency Division Multiplexing) modulated signal.
- the OFDM modulated signal is transmitted from the antenna to the terminal as transmission data.
- the control data encoding unit 109 encodes the control data generated by the control data generating unit 107 at a predetermined encoding rate.
- the control data modulator 111 digitally modulates the encoded control data at a predetermined modulation level.
- the modulated coding control data is transmitted to the terminal through a dedicated control channel.
- the FB data demodulator 125 demodulates the received feedback data.
- the FB data decoding unit 127 decodes the demodulated feedback data and extracts the CQI of each terminal.
- FIG. 3 is a block diagram illustrating a configuration of the terminal according to the first embodiment.
- the terminal of the first embodiment includes an OFDM demodulator 201, a channel estimator 203, a channel quality measurer 205, a MIMO separator 207, a rearrangement data return unit 209, an allocation Data return unit 211, demodulation unit 213, decoding unit 215, feedback data generation unit (FB data generation unit) 217, feedback data encoding unit (FB data encoding unit) 219, and feedback data modulation unit (FB A data modulation unit) 221, a control data demodulation unit 223, and a control data decoding unit 225.
- FB data generation unit feedback data generation unit
- FB data encoding unit feedback data encoding unit
- FB A data modulation unit feedback data modulation unit 221, a control data demodulation unit 223, and a control data decoding unit 225.
- the OFDM demodulator 201 performs fast Fourier transform on the received data and outputs MIMO data in which the received data is converted in subcarrier units.
- Channel estimation section 203 estimates the propagation channel of this terminal using pilot symbols.
- Channel quality measurement section 205 estimates average SINR using pilot symbols.
- the MIMO separation unit 207 multiplies or adds the same MIMO transmission weight as that of the base station to the MIMO data output from the OFDM demodulation unit 201, and separates the modulated data.
- the MIMO transmission weight is input from control data decoding section 225.
- the rearrangement data return unit 209 returns a part of the rearranged data of the terminal # 2 to the original position according to the rearrangement pattern input from the control data decoding unit 225. Since the data of terminal # 1 is not rearranged, the rearrangement data return unit 209 does not perform rearrangement return on the data of terminal # 1.
- the arrangement data return unit 211 extracts data arranged on the PRB.
- the demodulator 213 digitally demodulates the data extracted by the arrangement data return unit 211 and converts it into encoded data.
- the decoding unit 215 performs error correction decoding to decode the encoded data.
- the FB data generation unit 217 determines control data including information such as CQI and MIMO transmission weight of this terminal from the average SINR derived by the channel quality measurement unit 205.
- the FB data encoding unit 219 encodes the control data generated by the FB data generation unit 217 at a predetermined encoding rate.
- the FB data modulation unit 221 digitally modulates the encoding control data at a predetermined modulation level.
- the control data demodulator 223 demodulates the received control data.
- the control data decoding unit 225 decodes the demodulated reception control data.
- the data placement unit 117 assigns the data shown in FIG. 12 assigned to the VRB to the PRB corresponding to the VRB in a one-to-one correspondence in the frequency direction, as shown in FIGS. 13 (a) and (b).
- the data rearrangement unit 119 rearranges a part of the actual data to be transmitted to the terminal # 2 among the data shown in FIGS. 13A and 13B to the empty resource block.
- 4A and 4B are diagrams illustrating an example of data transmitted to each terminal assigned to the PRB after data rearrangement is performed.
- FIG. 4A shows data transmitted to the terminal # 1, which is not rearranged.
- FIG. 4B shows data transmitted to the terminal # 2, which is rearranged.
- the data rearrangement unit 119 rearranges a part of the actual data in the vicinity of the pilot symbol in the empty resource block shown in FIG. 13B. As described above, the data rearrangement unit 119 performs the rearrangement according to the rearrangement pattern input from the rearrangement pattern determination unit 105.
- the rearrangement pattern determination unit 105 determines a pattern (relocation pattern) when the data rearrangement unit 119 rearranges data based on the number of allocated resource blocks and the number of empty resource blocks.
- FIGS. 5A and 5B are diagrams illustrating another example of data transmitted to each terminal assigned to the PRB after data rearrangement is performed.
- FIG. 5A shows data transmitted to the terminal # 1, which is not rearranged.
- FIG. 5B shows data transmitted to the terminal # 2, which is rearranged.
- an allocated resource block when an allocated resource block includes an empty resource block, a part of actual data is rearranged in the vicinity of a pilot symbol in the empty resource block. Therefore, in the terminal to which the actual data is transmitted, all pilot symbols inserted in the allocated resource block are effectively used for estimating the propagation channel of the terminal. As a result, the average SINR characteristic of the channel of terminal # 2 is improved, and the error rate characteristic is improved. Also, the SINR characteristic of terminal # 1 is leveled, and as a result, the error rate characteristic of terminal # 1 is improved.
- the reason why the error rate characteristic of terminal # 2 is improved will be described.
- the more data arranged near the pilot symbols in the data transmitted to the terminal the better the channel estimation accuracy.
- the SINR is improved as the channel estimation accuracy is improved, and is improved as the interference from the channel of another multiplexed terminal is reduced (SINR ⁇ channel estimation accuracy / interference from the channel of another multiplexed terminal). .
- the average SINR characteristic of terminal # 2 is greatly improved. Therefore, the error rate characteristic in the channel of terminal # 2 is improved.
- an improvement in error rate characteristics due to the interleave effect is also expected.
- real data to be rearranged is arranged near the pilot symbols. For this reason, as the number of empty resource blocks increases, the channel estimation accuracy improves and the average SINR characteristic is further improved.
- FIG. 6 illustrates the estimation accuracy of each channel and the interference from the channel of the terminal # 2 in the channel of the terminal # 1 in the example illustrated in FIGS. 13A and 13B in which data rearrangement is not performed. It is a figure which shows distribution of SINR of terminal # 1. As indicated by a dotted line in FIG. 6, the estimation accuracy of each channel is high in the vicinity of the pilot symbol inserted in the PRB of each terminal, and decreases as the distance from the pilot symbol increases.
- the SINR of terminal # 1 becomes a value corresponding to the channel estimation accuracy in the PRB corresponding to the data allocation resource block of terminal # 2, and becomes a constant value in the PRB corresponding to the empty resource block regardless of the channel estimation accuracy.
- the SINR distribution characteristics differ depending on the resource block.
- FIG. 7 shows the estimation accuracy of each channel, the interference from the channel of terminal # 2 in the channel of terminal # 1, and the SINR distribution of terminal # 1 in the example shown in FIG. FIG.
- actual data is not allocated to resource elements that are far from pilot symbols and have low channel estimation accuracy. Therefore, the resource element at the same position in the channel of terminal # 1 does not receive interference from the channel of terminal # 2.
- the resource element close to the pilot symbol receives interference.
- the SINR of the resource element located far from the pilot symbol having relatively poor SINR is improved, and in the example shown in FIG. 6, near the pilot symbol having relatively good SINR.
- the SINR of the resource element located at is degraded. For this reason, as shown by a thick line in FIG. 7, the SINR characteristic of the terminal # 1 is leveled.
- the error correction code in the encoding unit 113 may be a random error correction code such as a turbo code.
- a turbo code As the SINR of data input to the turbo decoder is leveled, that is, closer to a normal distribution, the coding gain can be further improved. Therefore, the error rate characteristic in the channel of terminal # 1 is improved.
- the relocation pattern determination unit 105 provided in the base station shown in FIG. 1 includes the number of resource blocks allocated to the terminal # 2 (hereinafter simply referred to as “RB number”) and the number of empty resource blocks of the terminal # 2 (hereinafter simply referred to as “number of RBs”). Based on “the number of empty RBs”), the rearrangement pattern is determined.
- the type of rearrangement pattern is represented by a predetermined number of signaling bits. Since the number of rearrangement patterns increases when the number of empty RBs is large, the number of signaling bits also increases. Data indicating the type of arrangement pattern is transmitted from the base station to terminal # 2 as part of the control data. Therefore, if the number of signaling bits of data indicating the type of arrangement pattern is large, the power required to transmit control data increases. That is, as the number of signaling bits increases, power loss increases and average SINR characteristics deteriorate.
- FIG. 8 is a graph showing the influence of the channel estimation accuracy according to the number of empty RBs of terminal # 2 and the power loss of control data on the average SINR. As shown in FIG. 8, as the number of empty RBs increases, the average SINR improvement amount due to the improvement of channel estimation accuracy increases to a certain value, but reaches a peak when the number of empty RBs exceeds a predetermined value.
- the optimum number of empty RBs is set such that the difference between the improvement gain and the degradation gain of the average SINR characteristic due to the increase in the number of empty RBs is maximized in the improvement direction.
- the number of empty RBs is 8 or more, an improvement in the average SINR characteristic due to improvement in channel estimation accuracy cannot be expected. Therefore, by limiting the upper limit of signaling bits indicating the rearrangement pattern to 3 bits, power loss due to an increase in the number of signaling bits can be suppressed, and the average SINR characteristic can be improved.
- the upper limit value of the signaling bit is a value (power of 2) determined for each system.
- FIG. 9 is a diagram showing the relationship between signaling bits indicating the number of allocated resource blocks, the number of empty resource blocks, and the rearrangement pattern when the upper limit of signaling bits is limited to 3 bits. As shown in FIG. 9, even if the number of empty resource blocks is actually nine or more, the rearrangement pattern is expressed by signaling bits when the number of empty RBs is eight.
- the granularity of the signaling bits indicating the rearrangement pattern described in the second embodiment is made constant, the number of signaling bits increases as the number of empty RBs increases.
- the granularity of the signaling bit is equal to the unit (quantization unit) for quantizing the empty area in the resource. For example, when the granularity is 1, since the empty area is quantized in units of 1 RB, the number of signaling bits when there are 8 empty RBs is 3 bits. However, if there are 16 empty RBs, the number of signaling bits is 4, which exceeds the upper limit value of signaling bits described in the second embodiment.
- the granularity (quantization unit) is set according to the number of empty RBs.
- FIG. 10A and 10B show the relationship between the number of empty RBs and the granularity when the upper limit value of the number of signaling bits is 3.
- FIG. 10A is a conceptual diagram when quantizing 8 empty RBs with a granularity of 1
- FIG. 10B is a conceptual diagram when quantizing 16 empty RBs with a granularity of 2.
- FIG. 10B when 16 empty RBs are quantized with a granularity of 1, the number of signaling bits becomes 4 bits and exceeds the upper limit. Therefore, in this embodiment, the number of signaling bits is suppressed to 3 bits by setting the unit for quantizing 16 empty RBs to 2 RBs and setting the granularity to 2.
- FIG. 11 is a diagram illustrating a relationship between the number of RBs of terminal # 2, the number of empty RBs, and signaling bits indicating a rearrangement pattern.
- the granularity (quantization unit) of the signaling bits is set so as not to exceed the upper limit value of the signaling bits. For this reason, even if the number of empty RBs exceeds the optimum number of empty RBs that maximizes the improvement gain of the average SINR characteristic described in the second embodiment, the rearrangement pattern can be represented by the upper limit value of the signaling bits.
- the multiplexing number is 2 has been described as an example, but the multiplexing number may be three or more.
- the MU-MIMO scheme has been described as an example of the downlink transmission scheme.
- a SU-MIMO (Single User-MIMO) scheme may be used.
- the data multiplexed by the base station is a plurality of different data transmitted to one terminal via a plurality of propagation channels.
- the pilot symbols of the terminals to be multiplexed are adjacent on the time axis or the frequency axis, but may be positioned adjacent to each other without being adjacent.
- the number of pilot symbols of each terminal may be different. In this case, pilot symbols of a plurality of terminals exist in the vicinity of a certain pilot symbol, and pilot symbols of a plurality of terminals exist in the vicinity of a certain pilot symbol. You may not.
- the base station may notify the number of RBs of terminal # 1 through the dedicated channel of terminal # 2. Since terminal # 2 can acquire the number of RBs of itself from the dedicated control channel, terminal # 2 acquires the number of RBs of terminal # 1 from the dedicated control channel addressed to itself, and calculates the difference to obtain the number of empty RBs. Because you can.
- the base station may notify the number of RBs of terminal # 1 as control data. Since terminal # 2 can acquire its own number of RBs from the dedicated control channel, it can obtain the number of empty RBs by acquiring the number of RBs of terminal # 1 from the common control channel and calculating the difference. It is. Further, when this method is used, it is not necessary to consider additional signaling for an existing system.
- the generation factor of the empty RB is limited to the difference in data size between terminals.
- an empty RB occurs even in a situation where there is no terminal to which data is allocated. Even in such a case, the above-described data rearrangement can be applied.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. 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. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the wireless communication apparatus according to the present invention is useful as a base station or the like that fully utilizes the functions of all pilot symbols.
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Abstract
Description
図1は、第1の実施形態の基地局の構成を示すブロック図である。図1に示すように、第1の実施形態の基地局は、スケジューリング部101と、空リソースブロック検出部(空RB検出部)103と、再配置パターン決定部105と、制御データ生成部107と、制御データ符号化部109と、制御データ変調部111と、符号化部113と、変調部115と、データ配置部117と、データ再配置部119と、MIMO多重部121と、OFDM変調部123と、フィードバックデータ復調部(FBデータ復調部)125と、フィードバックデータ復号部(FBデータ復号部)127とを備える。
図1に示した基地局が備える再配置パターン決定部105は、端末#2に割り当てられたリソースブロック数(以下、単に「RB数」という)及び端末#2の空リソースブロック数(以下、単に「空RB数」という)に基づいて、再配置パターンを決定する。再配置パターンの種類は、所定数のシグナリングビットによって表される。空RB数が多いと再配置パターンの種類が増すため、シグナリングビット数も増す。配置パターンの種類を示すデータは、制御データの一部として基地局から端末#2に送信される。したがって、配置パターンの種類を示すデータのシグナリングビット数が多いと、制御データを送信するために要する電力が増大する。すなわち、シグナリングビット数が増すと電力損が増大し、平均SINR特性が悪化する。
第2の実施形態で説明した再配置パターンを示すシグナリングビットの粒度を一定にすると、空RB数が大きくなるに従いシグナリングビット数が増大する。なお、シグナリングビットの粒度は、リソース中の空領域を量子化する際の単位(量子化単位)に等しい。例えば、粒度を1のとき、空領域は1RB単位で量子化されるため、空RBが8つある場合のシグナリングビット数は3ビットである。しかし、空RBが16つある場合、シグナリングビット数は4ビットとなり、第2の実施形態で説明したシグナリングビットの上限値を超えてしまう。第3の実施形態では、空RB数に応じて粒度(量子化単位)を設定する。
103 空リソースブロック検出部(空RB検出部)
105 再配置パターン決定部
107 制御データ生成部
109 制御データ符号化部
111 制御データ変調部
113 符号化部
115 変調部
117 データ配置部
119 データ再配置部
121 MIMO多重部
123 OFDM変調部
125 フィードバックデータ復調部(FBデータ復調部)
127 フィードバックデータ復号部(FBデータ復号部)
201 OFDM復調部
203 回線推定部
205 回線品質測定部
207 MIMO分離部
209 再配置データ戻し部
211 配置データ戻し部
213 復調部
215 復号部
217 フィードバックデータ生成部(FBデータ生成部)
219 フィードバックデータ符号化部(FBデータ符号化部)
221 フィードバックデータ変調部(FBデータ変調部)
223 制御データ復調部
225 制御データ復号部
Claims (9)
- サイズが異なる複数のデータ群を多重した信号を通信端末に伝送する無線通信装置であって、
時間方向及び周波数方向のリソースブロックが所定数割り当てられた前記複数のデータ群の内、前記所定数のリソースブロックを全て利用しないデータ群の空リソースブロックを検出する空リソースブロック検出部と、
空リソースブロックを含むリソースが割り当てられたデータ群に対して、リソースブロックに配置されたデータの一部を、前記空リソースブロック中に設けられたパイロットシンボルの近傍に再配置するデータ再配置部と、
を具備する、無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記複数のデータ群の各々に割り当てられたリソースブロックの数と、前記空リソースブロック検出部が検出した空リソースブロックの数に応じて、データの再配置のパターンを決定する再配置パターン決定部を具備し、
前記データ再配置部は、前記再配置パターン決定部が決定したパターンに基づいてデータを再配置する、無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記パイロットシンボルは、前記所定数のリソースブロックの各々に、時間方向又は周波数方向に対して等間隔で配置され、
前記複数のデータ群の各々に割り当てられたパイロットシンボルは、時間方向及び周波数方向でそれぞれ近傍した位置に設けられる、無線通信装置。 - 請求項3に記載の無線通信装置であって、
前記複数のデータ群の各々に割り当てられたパイロットシンボルは、時間方向及び周波数方向で隣接する、無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記データ再配置部は、リソースブロックに配置されたデータの内、当該リソースブロック中に設けられたパイロットシンボルから時間方向及び周波数方向の少なくともいずれか一方で最も離れたデータから優先して、前記空リソースブロック中に設けられたパイロットシンボルの近傍に再配置する、無線通信装置。 - 請求項2に記載の無線通信装置であって、
前記再配置パターンの種類を示すシグナリングビットの数は、空リソースブロックに配置されたパイロットシンボルを活用し、チャネル推定精度を向上させることによる平均SINRの改善と、シグナリングビット数の増加に基づく電力損が増大することによる平均SINRの劣化との差が最大となるビット数である、無線通信装置。 - 請求項6に記載の無線通信装置であって、
前記再配置パターンの種類を示すシグナリングビットの粒度は、前記空リソースブロックの数に基づく再配置パターンの数に応じて変更される、無線通信装置。 - 請求項1~7のいずれか一項に記載の無線通信装置であって、
当該無線通信装置は、前記複数のデータ群を多重した信号を複数の通信端末に空間多重伝送し、
前記複数のデータ群の各々は、前記複数の通信端末の各々に送信されるデータである、無線通信装置。 - サイズが異なる複数のデータ群を多重した信号を通信端末に伝送する無線通信装置が行うデータ再配置方法であって、
時間方向及び周波数方向のリソースブロックが所定数割り当てられた前記複数のデータ群の内、前記所定数のリソースブロックを全て利用しないデータ群の空リソースブロックを検出し、
空リソースブロックを含むリソースが割り当てられたデータ群に対して、リソースブロックに配置されたデータの一部を、前記空リソースブロック中に設けられたパイロットシンボルの近傍に再配置する、データ再配置方法。
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WO1996026582A1 (fr) * | 1995-02-23 | 1996-08-29 | Ntt Mobile Communications Network Inc. | Procede de transmission a vitesse variable, et emetteur et recepteur utilisant ce procede |
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