WO2007119452A1 - 無線通信システム、無線送信装置、およびリソース割当方法 - Google Patents
無線通信システム、無線送信装置、およびリソース割当方法 Download PDFInfo
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- WO2007119452A1 WO2007119452A1 PCT/JP2007/055683 JP2007055683W WO2007119452A1 WO 2007119452 A1 WO2007119452 A1 WO 2007119452A1 JP 2007055683 W JP2007055683 W JP 2007055683W WO 2007119452 A1 WO2007119452 A1 WO 2007119452A1
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- resource allocation
- subframe
- lrb
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource 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
- H04L5/0001—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
-
- 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
- H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
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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
- H04L5/0041—Frequency-non-contiguous
-
- 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
- H04L5/0058—Allocation criteria
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
Definitions
- Wireless communication system Wireless communication system, wireless transmission device, and resource allocation method
- the present invention relates to a radio communication system, a radio transmission apparatus, and a resource allocation method.
- OFDM Orthogonal Frequency Division Multiplex
- LRB Localized Resource Block
- DRB Distributed Resource Block
- the base station performs frequency scheduling that adaptively assigns subcarriers based on the reception quality of each frequency band at each mobile station, so the maximum multi-diversity effect is achieved. And can communicate efficiently. Frequency scheduling is usually performed for each resource block (RB) in which several subcarriers adjacent to the coherent bandwidth are grouped together. Therefore, almost no frequency diversity effect can be obtained.
- RB resource block
- TTI concatenation is a concatenation of multiple subframes. This technology is treated as TTI. Therefore, for example, control information common to a plurality of subframes is added to the head of the connected frames. In this way, TTI concatenation notifies only one piece of control information to multiple subframes, so the overhead required for the control information of subsequent subframes can be reduced.
- this TTI concatenation is called Long TTI or adaptive TTI.
- Non-Special Reference 1 Physical channel Structure and Procedure for EUTRA Downlink, 3 GPP RAN WGl # 42 meeting (2005.8) Rl- 050884
- Non-Patent Document 2 "Physical Channel Structure for Evolved UTRA", 3GPP RAN WGl # 4 1 meeting (2005.3) Rl— 050464
- FIG. 1 is a diagram for explaining a problem that occurs when earning money.
- the base station Based on the reception quality of each RB fed back from the mobile station, the base station performs frequency scheduling during transmission of the first subframe # 1, and allocates transmission data to frequency resources using the LRB scheme. At that time, the control information necessary for decryption is notified by SCCH (shared control channel). Also, in subframe # 2, transmission is performed by assigning to the same frequency resource using the same LRB method as in subframe # 1. Similarly, in subframe # 3, transmission is performed by allocating to the same frequency resource using the same LRB method as in subframe # 1.
- SCCH shared control channel
- the channel environment may fluctuate due to the movement of the mobile station and the change in the surrounding environment as the subsequent subframes are reached.
- An object of the present invention is to improve reception quality when a plurality of subframes are concatenated into a TTI as in TTI concatenation, and communication processing is performed for each frame.
- a communication system, a wireless transmission device, and a resource allocation method are provided.
- the wireless communication system of the present invention is a wireless communication system in which a connected subframe in which a plurality of subframes are connected is one unit of communication processing, and an LR B (Localized Resource Block) method or a resource allocation method is used.
- DRB Distributed Resource Block
- DRB Distributed Resource Block
- selection means for selecting selection means for selecting; and allocation means for allocating the data in the concatenated subframe to each frequency resource for each subframe according to the selected resource allocation system.
- the resource allocation method is switched from the LRB method to the DRB method.
- the selection means may be mounted on a deviation of a radio transmission apparatus or a radio reception apparatus in the radio communication system.
- the concatenated subframe indicates, for example, a TTI after concatenation in the TTI concatenation technique.
- reception quality can be improved when a plurality of subframes are concatenated into a single frame and communication processing is performed for each frame as in TTI concatenation.
- FIG. 2 is a block diagram showing the main configuration of a radio transmission apparatus according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing an example of a table inside an allocated resource table determination unit according to Embodiment 1.
- FIG. 4 is a diagram for explaining the basic operation of the allocated resource table determination unit according to Embodiment 1.
- FIG. 5 is a diagram for explaining a signal transmitted by the radio transmission apparatus according to the first embodiment.
- FIG. 6 is a diagram for explaining LRB numbers and DRB numbers.
- FIG. 7 is a block diagram showing the main configuration of a radio receiving apparatus according to Embodiment 1
- FIG. 8 explains reception processing and reception performance of the radio receiving apparatus according to Embodiment 1.
- FIG. 9 is a block diagram showing the main configuration of a wireless transmission apparatus according to Embodiment 2
- FIG. 10 is a diagram for explaining a signal transmitted by the wireless transmission device according to the second embodiment.
- FIG. 11 is a diagram for explaining reception processing and reception performance of the wireless reception device according to the second embodiment.
- FIG. 12 A diagram showing an example of correspondence between LRB numbers and DRB numbers
- FIG. 13 is a diagram showing an example of a DRB resource allocation method
- FIG. 16 is a diagram showing an example of arrangement of turbo code bits
- FIG. 19 A diagram showing a configuration for synchronizing the reassignment start timing with the CQI reception timing.
- FIG. 20 A diagram showing a reserved channel in which adjacent subframes are connected.
- FIG. 2 is a block diagram showing the main configuration of the radio transmitting apparatus according to Embodiment 1 of the present invention.
- the radio transmission apparatus is used as a base station in a mobile communication system.
- Radio transmission apparatus includes allocation resource table determination section 101, encoding sections 102-1, 102-2, concatenation control section 103, modulation sections 104-1, 104-2, and multiplexing section 105. , Control information multiplexing section 106, IFFT section 107, CP insertion section 108, radio transmission section 109, and antenna 110, and each section performs the following operations.
- the code unit 102-1 performs error correction coding such as turbo coding on the transmission data, and outputs the result to the concatenation control unit 103.
- the code key unit 102-2 also performs error code key such as turbo code key on the control data and outputs the result to the modulation unit 104-2.
- Connection control section 103 controls the number of subframes to be connected. Specifically, the symbols multiplexed in the transmission subframe in the encoded data are sent to modulation section 104-1. Further, the subframe number to be transmitted next is notified to multiplexing section 105 and control information multiplexing section 106.
- Modulation section 104-1 performs predetermined modulation processing such as QPSK and 16QAM on the symbols output from concatenation control section 103 and multiplexed in the transmission subframe, and outputs the result to multiplexing section 105.
- Modulation section 104-2 performs modulation such as QPSK or 16QAM on the code key data output from code key section 102-2, and outputs the result to control information multiplexing section 106.
- Allocation resource table determination unit 101 determines a resource allocation method based on moving speed information to which the mobile station power is fed back by referring to a data table stored therein, and an allocation indicating this method.
- the resource control signal is output to multiplexing section 105 and encoding section 102-2.
- FIG. 3 is a diagram illustrating an example of the table in the allocation resource table determination unit 101. In this table, the correspondence between the resource allocation scheme (LRB scheme, DRB scheme) and the allocated resource control signal is predetermined for each subframe (specifically, for each subframe number).
- the allocation resource table determination unit 101 assigns the allocation resource control signal # 1 is output (hatched area in the figure).
- Multiplexer 105 allocates the modulated data output from modulator 104-1 to a plurality of frequency resources, performs frequency multiplexing of transmission data, and outputs a multiplexed signal to control information multiplexer 106.
- multiplexing section 105 uses the resource allocation scheme for each subframe indicated by the allocation resource control signal.
- the multiplexing unit 105 allocates frequency resources based on CQI information fed back from the mobile station.
- Control information multiplexing section 106 checks the subframe number, and in the case of the first subframe, multiplexes predetermined control information and outputs the multiplexed signal to IFFT section 107.
- IFFT section 107 performs inverse fast Fourier transform (IFFT) processing on the multiplexed signal, generates an OFDM symbol converted into the time domain, and outputs the OFDM symbol to CP insertion section 108.
- IFFT inverse fast Fourier transform
- CP insertion section 108 duplicates the rear part of the OFDM symbol output from IFFT section 107 as a CP, inserts it at the beginning, and outputs the obtained signal to radio transmission section 109.
- Radio transmission section 109 performs predetermined radio transmission processing such as DZA conversion and power amplification on the signal after CP insertion, generates a radio signal, and transmits it via antenna 110.
- FIG. 4 is a diagram for explaining the basic operation of the allocation resource table determination unit 101.
- the allocation resource table determination unit 101 Based on the moving speed at which the mobile station force is also fed back, the speed of channel fluctuation can be predicted.
- the graph in the figure shows the average channel quality calculated for each band when the LRB or DRB method is used. From this graph, the allocation resource table determination unit 101 identifies a subframe in which the average channel quality of the DRB system band is larger than the average channel quality of the LRB system band. That is, the position of the boundary line when the frequency diversity effect exceeds the frequency scheduling effect is obtained.
- Figure 4 shows the boundary line during medium speed movement. Subframes that are temporally behind this boundary line are subframes for which the resource allocation method should be switched. Therefore, allocation resource table determination section 101 multiplexes the subframe number (especially called the switching subframe number) and the allocation resource control signal determined based on the table shown in FIG. 3 as control information. Notify part 105 and sign key part 102-2.
- FIG. 5 is a diagram for explaining a signal transmitted from the radio transmission apparatus according to the present embodiment by the above operation. Here, it is assumed that “1” is selected as the allocation resource control signal.
- LRB is selected as the resource allocation format based on the CQI to which the mobile station power is also fed back, and the reception quality is the best in accordance with the LRB format.
- the control information includes MCS (Modulation and Coding Scheme), coding rate, etc., as well as the number of subframes to which TTI concatenation is applied (3 in the example in the figure), allocated resource control signal, LRB number and DRB number Control channel SC Multiplexed to CH and transmitted.
- MCS Modulation and Coding Scheme
- coding rate etc.
- allocated resource control signal LRB number and DRB number Control channel SC Multiplexed to CH and transmitted.
- the LRB number and the DRB number identify, for example, the four resource allocation methods (LR B # 1 to # 4) according to this resource allocation method in the case of the LRB method. It is a number, and more specifically, indicates the position of the RB to which transmission data is actually allocated.
- multiplexing section 105 uses the same resource allocation scheme (LRB) as the top subframe and allocates transmission data to the same RB.
- LLB resource allocation scheme
- multiplexing section 105 switches the resource allocation scheme between the first subframe and subframe # 2, and DR
- the radio transmitting apparatus uses the LRB scheme as the resource allocation scheme in the first few subframes in the middle of transmission data, and switches from the subframe in the middle to the DRB scheme. To send.
- the switching timing is adaptively changed based on the moving speed of the mobile station.
- FIG. 7 is a block diagram showing the main configuration of the radio reception apparatus according to the present embodiment.
- the radio reception apparatus includes an antenna 151, a radio reception unit 152, a CP removal unit 153, an FFT unit 154, a channel compensation unit 155, a control information separation unit 156, a demodulation unit 157, and a decoding key.
- a unit 158, a data extraction unit 159, a connection control unit 161, and a decoding unit 162 are provided, and each unit performs the following operations.
- Radio reception section 152 performs predetermined radio reception processing such as down-conversion and AZD conversion on the signal received via antenna 151, and outputs the obtained baseband signal to CP removal section 153 .
- CP removing section 153 removes the CP added to the received signal and outputs the signal after the CP removal to FFT section 154.
- FFT section 154 performs fast Fourier transform (FFT) processing on an OFDM symbol basis, converts the received signal into the frequency domain, and outputs the frequency domain signal to channel compensation section 155. To do.
- FFT fast Fourier transform
- Channel compensation section 155 also performs channel estimation for the received pilot symbol power of the frequency domain signal, compensates the received signal using the obtained channel estimation value, and outputs the compensated signal to control information separation section 156 To do.
- the channel estimation force is also measured separately by measuring the moving speed and CQI.
- Control information demultiplexing section 156 demultiplexes the symbols on which the control information is multiplexed from the compensated signal, and outputs the symbols mapped with the control information to demodulation section 157, and extracts the other symbols as data. Output to part 159.
- Demodulation section 157 performs predetermined demodulation processing such as QPSK and 16QAM on the symbols to which the control information is mapped, and outputs the demodulated signal to decoding section 158.
- Decoding unit 158 decodes the demodulated signal to obtain control data, and among these, the allocation resource control signal, LRB number, and DRB number are output to data extraction unit 159, and the number of concatenated subframes is determined. Is output to the connection control unit 161.
- Data extraction section 159 also uses the input allocated resource control signal, LRB number, DRB number, and subframe number to extract the data symbol from the output signal power of control information separation section 156, and demodulation section 160 Output to.
- the data extraction unit 159 has the same table as the table (see FIG. 3) included in the allocation resource table determination unit 101 in the wireless transmission device.
- Demodulation section 160 performs predetermined demodulation processing such as QPSK and 16QAM on the extracted data symbols, calculates the likelihood for each bit, and outputs the demodulated signal to concatenation control section 161.
- connection control unit 161 holds the data of each reception subframe in the internal memory for a certain period of time while counting the number of reception subframes output from the demodulation unit 160. Then, according to the number of concatenated subframes notified from the decoding unit 158, when reception data of subframes sufficient for performing TTI concatenation is obtained, it is retained !, and a plurality of reception subframes are concatenated, The concatenated data (TTI) is passed to the decryption unit 162.
- Decoding unit 162 decodes the data output from connection control unit 161 to obtain received data.
- FIG. 8 is a diagram for explaining the reception processing and reception performance of the radio reception apparatus according to the present embodiment having the above-described configuration. It is assumed that “1” is selected as the allocated resource control signal.
- the control channel SCCH arranged at the head of subframe # 1 is demodulated to obtain control data. Then, the allocated resource control signal, LRB number, DRB number, and number of concatenated subframes included in the control data are acquired and stored in the internal memory.
- the data extraction unit 159 determines that the resource allocation method is LRB based on the internal table (see FIG. 3) because the allocation resource control signal power is “l”. The LRB number power that is separately input identifies the RB to which data is actually assigned, and extracts data symbols from this RB.
- data allocation section 159 determines that the current resource allocation method is also LRB because the allocated resource control signal is "1", and the LRB number separately input Based on the above, the RB in which the data symbol is multiplexed is discriminated and the data symbol is extracted.
- data extraction section 159 determines that the current resource allocation method is DRB because the allocated resource control signal is "1", and from the DRB number input separately. Data symbols are multiplexed to determine the RB and extract the data symbols
- the LRB method is used as the resource allocation method in the first subframes # 1 and # 2 of TTI, and the DRB method is used from subframe # 3 on the way.
- # 3 frequency diversity gain can be obtained, and reception quality does not deteriorate significantly.
- the radio reception apparatus improves the reception performance by receiving the signal transmitted from the radio transmission apparatus according to the present embodiment and performing the above operation. It is out.
- the radio transmission apparatus performs T on the transmission signal. While performing TI concatenation, the resource allocation method is switched from LRB to DRB in a subframe in the middle according to a predetermined rule. Therefore, even if control information is reduced due to TTI concatenation, the DRB method is also used when the channel environment fluctuates and frequency allocation performed based on the first subframe becomes inappropriate in subsequent subframes. By using, diversity effect can be obtained and degradation of reception quality can be prevented. In other words, this embodiment can be characterized by switching the resource allocation method to the LRB power DRB at the timing when the effect of frequency scheduling has declined.
- the timing (specifically, the switching subframe number) for switching the resource allocation method is adjusted according to the moving speed of the mobile station. Therefore, even when the channel state fluctuates variously, it is possible to follow this, and it is possible to prevent deterioration in reception performance.
- the wireless transmission device when transmitting the first subframe, the LRB number and the DRB number are both multiplexed on the SCCH and transmitted as control information. However, the LRB number and the DRB number are preliminarily transmitted.
- the wireless transmission device may be configured to notify only the LRB number to the wireless reception device.
- FIG. 12 is a diagram showing an example of correspondence between LRB numbers and DRB numbers. As a result, the radio transmission apparatus only needs to notify the LRB number and control information can be reduced, and the radio reception apparatus can recognize the DRB allocation number from the notified LRB number.
- the DRB system has only one subframe. However, for example, when the number of connected subframes is more than the number of subframes, or when the resource allocation system is switched in subframe # 2. In some cases, there are multiple subframes that are DRB systems. In such a case, the following DRB method resource allocation method can be applied.
- FIG. 13 is a diagram illustrating an example of a DRB resource allocation method.
- the frequency resource allocation position in the DRB scheme is changed for each subframe. Ie The RBs of subsequent subframes should be different for each subframe. As a result, more frequency diversity effects can be obtained.
- FIG. 14 is a diagram showing another variation of the DRB-type resource allocation method.
- resources in the frequency range in the range close to that of the LRB system are allocated.
- the frequency resource distribution in the DRB scheme increases as the number of subsequent subframes increases. As a result, the transition to the LRB method power DRB method can be performed gradually.
- FIG. 15 is a diagram showing an example of the arrangement of repetition symbols.
- at least one symbol may be assigned to an LRB subframe.
- FIG. 16 is a diagram showing an example of the arrangement of turbo code bits. As a result, the systematic bits can obtain stable channel quality, and therefore the reception characteristics after the tangential decoding can be improved.
- the wireless transmission device is configured to switch resource allocation scheme switching timing.
- a configuration may be adopted in which only the subframe number is notified to the wireless reception apparatus as control information.
- the switching timing of the resource allocation method the power (switching timing of the switching timing) described as an example of the configuration in which the subframe number to which the switching is performed is notified.
- Subframe number) Z number of connected subframes concatenated with TTI
- a percentage of the total TT I that is, a parameter indicating the position of the switching timing as viewed from the whole ⁇ Also good.
- the switching timing of the resource allocation scheme is a design stage capability. It may be configured to be fixed.
- Embodiment 2 of the present invention a case will be described as an example where the radio transmitting apparatus according to the present embodiment is used as a base station in a mobile communication system.
- Embodiment 1 shows a configuration in which the base station switches the resource allocation method from LRB to DRB using a predetermined subframe corresponding to the moving speed of the mobile station as a switching timing according to a predetermined table. It was.
- the resource allocation method is fixed for the first predetermined period, and thereafter, switching of the resource allocation method is adaptively determined based on various conditions.
- a configuration is shown in which the mobile station is notified of the control start timing and the resource allocation method for each subsequent subframe as appropriate.
- FIG. 9 is a block diagram showing the main configuration of the radio transmitting apparatus according to the present embodiment.
- This radio transmission apparatus has the same basic configuration as that of the radio transmission apparatus shown in Embodiment 1 (see FIG. 2), and the same components are denoted by the same reference numerals, Is omitted.
- constituent elements that have the same basic operation but differ in detail will be identified by adding the same reference numerals with lowercase letters to the same numbers, and will be described as appropriate.
- Allocation resource switching determination section 201 determines the timing (reallocation start timing) for starting the reassignment of frequency resources based on the moving speed of the mobile station. Specifically, in order to specify the reassignment start timing, the number of subframes (number of reassignment subframes) up to the subframe where the start subframe power reallocation starts is determined. This reassigned subframe number is set to a small value for a mobile station with a fast moving speed and set to a large value for a mobile station with a slow moving speed. Also, the allocation resource switching determination unit 201 actually transmits transmission data using the LRB method based on the CQI information fed back from the mobile station. Select a frequency resource to map.
- the number of reassigned subframes and the resource assignment method of each subframe after the start of reassignment are output to multiplexing section 105a and control information multiplexing section 106a.
- the reception quality of the currently used RB is calculated based on the latest CQI that the mobile station power is fed back after the start of reassignment.
- the resource allocation method is switched to the LRB method power DRB method.
- Multiplexing section 105a uses the resource allocation method for each subframe indicated by the allocation resource control signal output from allocation resource switching determination section 201, and uses the modulation data output from modulation section 104-1 as the frequency. Frequency multiplexing is performed by allocating to resources, and the obtained multiplexed signal is output to the control information multiplexing unit 106a. In particular, after the start of reassignment, in the case of the LRB scheme, the multiplexing unit 105a assigns frequency resources based on CQI information that is fed back to the mobile station power each time.
- control information multiplexing section 106a determines the power force after starting the reallocation, and after starting the reallocation, each subframe Each time, predetermined control information is multiplexed, and the multiplexed signal is output to IFFT section 107.
- FIG. 10 is a diagram for explaining a signal transmitted from the radio transmission apparatus according to the present embodiment.
- transmission data is allocated to a band (frequency resource) with the best reception quality based on the CQI fed back from the mobile station according to the LRB scheme.
- the number of reassignment subframes (in this example, the number of reassignment subframes is “3”) is multiplexed with the SCCH and notified as control information along with the MCS, coding rate, and the like.
- subframe # 2 the number of reassigned subframes is "3", so frequency resources are allocated to the same band as subframe # 1 by the LRB method.
- subframe # 3 the number of reassigned subframes is "3", so the RB reception quality of the currently used allocation resource is calculated based on the latest CQI fed back from the mobile station. To do.
- the radio transmission apparatus since it is recognized that the reception quality has deteriorated, the radio transmission apparatus according to the present embodiment switches the resource allocation method from the LRB method to the DRB method. If no degradation in reception quality is observed, no The line transmitter uses the LRB method as the resource allocation method for subframe # 3 as it is.
- FIG. 11 is a diagram explaining the reception processing and reception performance of the radio reception apparatus according to the present embodiment. It is assumed that LRB is selected as the resource allocation method and “3” is selected as the number of reallocation subframes.
- subframe # 1 When subframe # 1 is received, first, SCC H arranged at the head of subframe # 1 is demodulated to obtain control data. Then, the reallocation subframe number, resource allocation method, LRB number, DRB number, and concatenated subframe number included in the control data are acquired and stored in the internal memory.
- the resource allocation method is LRB
- the data extraction unit 159 extracts a data symbol from the allocation RB (RB to which data is actually mapped) based on the LRB number.
- data extraction section 159 can determine that the number of reassigned subframes is "3" and is not yet a subframe to be reassigned.
- the LRB method is used as the allocation method in the same way as subframe # 1, and data symbols are extracted from the allocation RB based on the LRB number.
- data extraction section 159 can determine that the number of reassignment subframes is "3" and the timing (subframe) at which reassignment is performed. Since it is necessary to acquire information, the SCCH is demodulated to obtain control data. If the resource allocation method included in the control data remains LRB, the data extraction unit 159 also extracts the data symbol for the allocation RB power based on the same LRB number as the previous subframe. In addition, when the resource allocation method included in the control data is changed to DRB, the data extraction unit 159 identifies V, RB, in which data symbols are multiplexed based on the DRB number, and these are identified. Extract data symbols from RB.
- the radio reception apparatus performs radio transmission according to the present embodiment.
- the reception performance can be improved by receiving the signal transmitted from the apparatus and performing the above operation.
- the resource allocation scheme is fixed for the first predetermined period, and thereafter, switching of the resource allocation scheme is adaptively determined based on various conditions. . Therefore, if the frequency scheduling effect (reception quality) by the LRB method during the transmission of the first subframe is reduced while reducing the control information by TTI concatenation, it is switched to the DRB method as appropriate by performing reallocation. The deterioration of characteristics can be prevented.
- the reassignment start timing is determined based on only the moving speed of the mobile station.
- the reassignment start timing is fed back from the mobile station.
- the time interval with the CQI is determined based on the degree of vacancy, that is, the delay time of the CQI reception timing power.
- a configuration may be adopted in which the reallocation start timing determined based on the mobile station's moving speed is corrected based on the delay time from the CQI reception timing. If the delay time from the CQI reception timing is large, it can be said that there is a high possibility that the average reception quality will fluctuate.
- Figures 17 and 18 show that the average channel quality fluctuates due to differences in CQI reception timing.
- the mobile station is moving at medium speed.
- the average channel quality decreases as the time interval increases from the CQI reception timing.
- the characteristic degradation is more noticeable in the LRB method than in the DRB method. Therefore, as the nomination of the present embodiment, the time when the characteristic curve of the LRB method and the characteristic curve of the DRB method intersect (intersection position of average channel quality), that is, the time when the characteristics of the LRB method and DRB method are switched is reallocated. Set as start timing. As a result, the optimum reassignment start timing is reached, so that it is possible to prevent deterioration in reception performance.
- This control may be performed based on BLER (outer loop control) in the mobile station, that is, based on ACKZNACK information transmitted from the mobile station to the base station.
- BLER outer loop control
- the reassignment start timing is set so that reassignment can be performed in accordance with the CQI reception timing fed back from the mobile station. It may be configured to synchronize with the communication timing (see Fig. 19). On the contrary, a configuration in which uplink CQI feedback is performed in accordance with the reassignment start timing, that is, a configuration in which CQI feedback is performed only for a subframe to be reassigned may be adopted.
- radio communication system radio transmission apparatus, and resource allocation method according to the present invention are not limited to the above embodiments, and can be implemented with various modifications.
- the uplink communication method is applicable to any communication method other than OFDM, such as DFT-OFDM, SC-FDMA, etc., which uses the LRB and DRB resource allocation methods. It is.
- the radio transmission apparatus receives the resource allocation method switching request or the frequency resource reallocation request from the radio reception apparatus (mobile station), and then performs the resource allocation.
- a configuration in which switching or reassignment of allocation methods is performed may be employed.
- the mobile station is configured to request the base station to perform switching etc. on the uplink only when the reception quality of the allocated band deteriorates and it becomes necessary to switch the resource allocation method from LRB to DRB. May be.
- the mobile station can take the initiative in switching the resource allocation method and the like, and can easily follow this even under severe channel fluctuations.
- the request signal a CQI feedback signal of mobile station power may be substituted.
- the base station may determine that there is a request for switching the resource allocation method, etc., and perform switching or the like. As a result, it is possible to request switching or the like without separately transmitting new control information.
- the CQI only needs to include at least average reception quality information of all DRB bands.
- control channel may be a control channel with another name such as a power individual control channel for which control information is notified by SCCH.
- the resource allocation method may be instructed for each subframe rather than instructing the resource allocation method for all subframes in the first subframe.
- the amount of deviation from R, the amount of degradation of reception characteristics, and the amount of margin for the required reception quality may be used.
- the LRB is a channel for performing frequency scheduling transmission, and may be referred to as a Localized Channel.
- DRB is a channel for performing frequency diversity transmission, and is sometimes called a Distributed Channel.
- the LRB is normally assigned in units of subbands or in units of a plurality of consecutive subcarriers.
- the DRB is usually composed of a plurality of distributed subcarriers over a wide band of OFDM symbols or is defined by an FH (Frequency Hopping) pattern.
- DRB is also sometimes called Intra-TTI frequency hopping.
- the DRB may be distributed by frequency interleaving.
- TTI concatenation is sometimes called Longer TTI, variable TTI, or adaptive ⁇ .
- the radio transmission apparatus can be mounted on a communication terminal apparatus and a base station apparatus in a mobile communication system, and thereby a communication terminal apparatus and a base having the same operational effects as described above.
- a station apparatus and a mobile communication system can be provided.
- the power described with reference to an example in which the present invention is configured by nodeware can also be realized by software.
- the algorithm of the resource allocation method according to the present invention in a programming language, storing this program in a memory, and executing it by the information processing means, the same function as that of the wireless transmission device according to the present invention Can be realized.
- 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 some or all of them.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. It is also possible to use a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection or setting of circuit cells inside the LSI.
- FPGA field programmable gate array
- the radio transmission apparatus and resource allocation method according to the present invention can be applied to applications such as a communication terminal apparatus and a base station apparatus in a mobile communication system.
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US12/293,522 US8649333B2 (en) | 2006-03-20 | 2007-03-20 | Radio communication system, radio transmission apparatus, and resource allocation method |
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Also Published As
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JP4887358B2 (ja) | 2012-02-29 |
US20090245188A1 (en) | 2009-10-01 |
US8649333B2 (en) | 2014-02-11 |
JPWO2007119452A1 (ja) | 2009-08-27 |
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