WO2012093449A1 - 送信装置、受信装置、送信方法、及び受信方法 - Google Patents
送信装置、受信装置、送信方法、及び受信方法 Download PDFInfo
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- WO2012093449A1 WO2012093449A1 PCT/JP2011/007109 JP2011007109W WO2012093449A1 WO 2012093449 A1 WO2012093449 A1 WO 2012093449A1 JP 2011007109 W JP2011007109 W JP 2011007109W WO 2012093449 A1 WO2012093449 A1 WO 2012093449A1
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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
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0684—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using different training sequences per antenna
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- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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Definitions
- the present invention relates to a transmitting device, a receiving device, a transmitting method, and a receiving method.
- LTE 3rd Generation Partnership Project Long-term Evolution
- LTE-A LTE-Advanced
- SRS uplink reception quality Sounding Reference Signal
- P-SRS Periodic SRS
- DA-SRS Dynamic Aperiodic SRS
- the transmission timing of the SRS is controlled by trigger information transmitted from the base station to the terminal.
- P-SRS is controlled by the upper layer
- DA-SRS is controlled by the control channel of the physical layer (ie, PDCCH).
- an SRS resource common to all terminals (hereinafter referred to as "common resource") is set.
- This common resource is notified on a cell basis. For example, when it is notified by the control information that the common resource is 1, 3, 8 subframes, all the terminals in the cell have predetermined periods in each of 1, 3, 8 subframes (specifically, the final symbol) While stopping transmission of the data signal, and using that period as a transmission resource for the reference signal.
- the top subframe, the set bandwidth, the transmission bandwidth, and the SRS are mapped to the above-described information on resources actually allocated to each terminal in the common resource (that is, parameters used for resource specification). Frame interval, transmission time, etc. This information is notified by the higher layer than the physical layer on a terminal basis.
- the SRS is scrambled by the orthogonal sequence at each terminal and transmitted. Further, in a terminal performing MIMO communication introduced in LTE-A, SRS transmitted from each antenna port is scrambled by an orthogonal sequence and transmitted. That is, SRSs transmitted from a plurality of terminals or terminals performing MIMO communication are multiplexed by code division and transmitted.
- a cyclic shift sequence (CS sequence) is used as the orthogonal sequence.
- the terminal generates a cyclic shift corresponding to any one of cyclic shift amounts 0 to 7 notified from the base station (that is, notified by 3 bits) in a ZC (Zadoff Chu) sequence.
- a transmission sequence to be used by the terminal itself is generated.
- the terminal applies cyclic shift to the basic sequence by cyclic shift amount notified by the base station ⁇ symbol length / 16 (ms).
- FIG. 1 shows that the basic sequence is cyclically shifted by 1 ⁇ 4 symbol.
- SRSs are arranged every other subcarrier.
- the same waveform is repeated twice within one symbol. Therefore, the waveform obtained by cyclic shift of (8 to 15) ⁇ symbol length / 16 (ms) and the waveform obtained by cyclic shift of (0 to 7) ⁇ symbol length / 16 (ms) are the same. .
- the base station and the terminal are offset values of the amount of cyclic shift for each of the second antenna port, the third antenna port, and the fourth antenna port from the amount of cyclic shift for the first antenna port. Share an offset pattern (hereinafter simply referred to as "offset pattern").
- offset pattern is fixed.
- the base station notifies the terminal of the amount of cyclic shift (CS0) of the first antenna port by 3 bits.
- the terminal obtains the amount of cyclic shift for each of the second antenna port, the third antenna port, and the fourth antenna port from the notified amount of cyclic shift (CS0) of the first antenna port.
- i is the antenna port identification number (0 to 3)
- k is the offset value of the antenna port of the identification number i with respect to the amount of cyclic shift of the antenna port of the identification number 0.
- FIG. 2 is a correspondence table in which four antenna port identification numbers and cyclic shift amounts corresponding to the respective antenna port identification numbers are associated with each of eight cyclic shift amount candidates of the antenna port of identification number 0. An example is shown.
- the antenna port 10 means the first antenna port in the case of using one antenna port.
- the antenna ports 20 and 21 mean the first and second antenna ports when using two antenna ports.
- the antenna ports 40, 41, 42, 43 mean the first, second, third and fourth antenna ports when four antenna ports are used.
- CS spacing is maximized between antenna ports, and when SRSs are transmitted from two antenna ports, or when SRSs are transmitted from four antenna ports, SRS separation is performed. Accuracy is the highest. Also, by matching the first two elements of the offset pattern in the case of four antenna ports with the offset pattern in the case of two antenna ports, the correspondence table common to the case of four antenna ports and the case of two antenna ports Can be used. Note that a correspondence table common to one antenna port and two antenna ports and four antenna ports may be used.
- An object of the present invention is to provide a transmitting apparatus, a receiving apparatus, a transmitting method, and a receiving method that improve the flexibility of SRS resource allocation without increasing the amount of signaling for cyclic shift amount notification.
- a transmitting apparatus is a transmitting apparatus that transmits a reference signal scrambled by a cyclic shift sequence from each of at least a part of L (L is a natural number of 2 or more) antenna ports, Receiving means for receiving setting information indicating a reference shift amount, which is given to a cyclic shift sequence used for scrambling a reference signal transmitted from a reference antenna port among the L antenna ports, the setting information, and In each of the reference shift amount candidate groups having reference shift amounts 0 to N-1 (N is an even number of 8 or more), based on the correspondence relationship in which cyclic shift amount candidates are associated with each antenna port, Identify the amount of shift given to the cyclic shift sequence used to scramble the reference signal transmitted from the antenna port And a forming unit configured to form a cyclic shift sequence based on the specified shift amount, and the correspondence relationship is defined as a reference shift amount X (X is a natural number of 0 or more and N / 2-1 or less.
- the offset pattern consisting of the offset value of the cyclic shift amount candidate associated with each antenna port with respect to the reference shift amount candidate of) and the antenna pattern corresponding with each antenna port with respect to the reference shift amount candidate of reference shift amount X + N / 2
- the offset pattern is different from that of the offset value of the cyclic shift amount candidate.
- a transmitting apparatus corresponds to each of a plurality of antenna ports determined based on a first correspondence relationship or a second correspondence relationship, with a reference signal generated using information on a cyclic shift amount.
- the first correspondence relationship which is the correspondence relationship between each of the plurality of antenna ports in the case and the frequency resource, and the information on the cyclic shift amount is X + N / 2 (where X is an integer of 0 or more and N / 2 ⁇ 1 or less, N represents the number of candidates for the amount of cyclic shift.)
- the second correspondence function which is a correspondence between each of a plurality of antenna ports and a frequency resource in the case of And, it is different.
- a receiving apparatus is a receiving apparatus that receives a reference signal scrambled by a cyclic shift sequence from at least a part of L (L is a natural number of 2 or more) antenna ports, Generation means for generating setting information indicating a reference shift amount, which is given to a cyclic shift sequence used for scrambling of a reference signal transmitted from a reference antenna port among the L antenna ports; The transmitting means for transmitting the signal to the transmitting device, the setting information, and the reference shift amount candidate group having the reference shift amounts 0 to N-1 (N is an even number of 8 or more) for each antenna port The reference signal transmitted from each antenna port based on the correspondence relationship with which the cyclic shift amount candidate is associated And a receiving means for specifying a shift amount given to a cyclic shift sequence used for scrambling, and receiving the reference signal using the specified shift amount, and the correspondence relationship is defined by a reference shift amount X (X Is an offset pattern consisting of offset values of cyclic shift amount candidates associated
- a receiver is mapped to frequency resources corresponding to each of a plurality of antenna ports determined based on the first correspondence or the second correspondence, and generated using information on the amount of cyclic shift.
- the first correspondence relationship which is a correspondence relationship with a frequency resource
- information on the cyclic shift amount is X + N / 2 (where X is an integer from 0 to N / 2-1, and N is the number of candidates for the cyclic shift amount)
- the second correspondence relationship which is the correspondence relationship between each of the plurality of antenna ports and the frequency resource in the case of.
- a transmission method is a transmission method for transmitting a reference signal scrambled by a cyclic shift sequence from each of at least a portion of L (L is a natural number of 2 or more) antenna ports, Receiving setting information indicating a reference shift amount, which is given to a cyclic shift sequence used for scrambling a reference signal transmitted from a reference antenna port among the L antenna ports, the setting information, and the reference shift amount From each antenna port based on the correspondence between the cyclic shift amount candidate corresponding to each antenna port in each of the reference shift amount candidate group having 0 to N-1 (N is an even number of 8 or more) Identifying the shift amount to be given to the cyclic shift sequence used for scrambling the reference signal to be transmitted; The cyclic shift sequence is formed based on the shift amount, and the correspondence relationship is associated with each antenna port with respect to the reference shift amount candidate of the reference shift amount X (X is a natural number of 0 or more and N / 2-1 or less).
- the offset pattern consisting of the offset value of the cyclic shift amount candidate and the offset pattern consisting of the offset value of the cyclic shift amount candidate corresponding to each antenna port with respect to the reference shift amount candidate of the reference shift amount X + N / 2 are different. .
- a transmission method corresponds to each of a plurality of antenna ports determined based on a first correspondence relationship or a second correspondence relationship, with reference signals generated using information on cyclic shift amounts.
- Each of the plurality of antenna ports and the frequency resource are mapped to a frequency resource, and the reference signal mapped to the frequency resource corresponding to each of the plurality of antenna ports is transmitted, and the information on the cyclic shift amount is X.
- the information on the cyclic shift amount is X + N / 2 (where X is an integer from 0 to N / 2-1, and N indicates the number of candidates for the cyclic shift amount).
- the second correspondence relationship which is the correspondence relationship between each of the plurality of antenna ports in the case of) and the frequency resource, is different.
- a receiving method is a receiving method of receiving a reference signal scrambled by a cyclic shift sequence from each of at least a portion of L (L is a natural number of 2 or more) antenna ports, Transmitting setting information indicating a reference shift amount, which is given to a cyclic shift sequence used for scrambling a reference signal transmitted from a reference antenna port among the L antenna ports, to the transmission apparatus of the reference signal, and the setting Information, and correspondence relationships in which cyclic shift amount candidates are associated with respective antenna ports in each of the reference shift amount candidate groups having the reference shift amounts 0 to N-1 (N is an even number of 8 or more) On the basis of the cyclic shift sequence used to scramble the reference signal transmitted from each antenna port.
- a receiving method is mapped to frequency resources corresponding to each of a plurality of antenna ports determined based on the first correspondence or the second correspondence, and generated using information on the amount of cyclic shift.
- Received the reference signal, measure the channel quality using the reference signal, and the first correspondence is the correspondence between each of a plurality of antenna ports and the frequency resource when the information on the cyclic shift amount is X
- the relationship and information on the cyclic shift amount is X + N / 2 (where X is an integer from 0 to N / 2 ⁇ 1 and N is the number of candidates for the cyclic shift amount).
- the second correspondence relationship which is the correspondence relationship between each and the frequency resource, is different.
- the present invention it is possible to provide a transmitting apparatus, a receiving apparatus, a transmitting method, and a receiving method that improve the flexibility of SRS resource allocation without increasing the signaling amount for cyclic shift amount notification.
- Diagram showing the basic sequence is cyclically shifted by 1/4 symbol
- Main configuration diagram of a base station according to Embodiment 1 of the present invention Main configuration diagram of a terminal according to Embodiment 1 of the present invention Block diagram showing configuration of base station according to Embodiment 1 of the present invention Block diagram showing configuration of terminal according to Embodiment 1 of the present invention
- Diagram to explain inter-sequence interference A diagram for explaining the effect of using the code resource setting rule table of FIG.
- the communication system according to Embodiment 1 of the present invention includes base station 100 and terminal 200.
- Base station 100 is an LTE-A base station
- terminal 200 is an LTE-A terminal.
- terminal 200 transmits a reference signal scrambled by a cyclic shift sequence obtained by applying a cyclic shift to the basic sequence from at least a part of L (L is a natural number of 2 or more) antenna ports.
- base station 100 scrambles the reference signal scrambled by the cyclic shift sequence obtained by applying the cyclic shift to the basic sequence from each of at least a part of L (L is a natural number of 2 or more) antenna ports.
- FIG. 3 is a main configuration diagram of base station 100 according to Embodiment 1 of the present invention.
- setting section 101 provides a reference shift provided to a cyclic shift sequence used for scrambling a reference signal transmitted from a reference antenna port among L (L is a natural number of 2 or more) antenna ports. Generate configuration information about quantities. Then, the generated setting information is transmitted to the terminal 200 via the transmission processing unit 104.
- reception processing section 108 performs cyclic shift with respect to each antenna port for each of the reference shift amount candidate groups having shift amounts 0 to N-1 (N is an even number of 8 or more) that the reference shift amount can take.
- the actual shift amount specified by identifying the actual shift amount to be given to the cyclic shift sequence used for scrambling of the reference signal transmitted from each antenna port is specified based on the correspondence relationship with which the amount candidate is associated and the setting information To receive the reference signal.
- an offset pattern composed of offset values of cyclic shift amount candidates associated with each antenna port with respect to reference shift amount candidates for the shift amount X (X is a natural number of 0 or more and N / 2-1 or less)
- FIG. 4 is a main configuration diagram of terminal 200 according to Embodiment 1 of the present invention.
- reception processing section 203 receives setting information on a reference shift amount, which is given to a cyclic shift sequence used for scrambling of a reference signal transmitted from a reference antenna port among L antenna ports.
- transmission control section 206 performs cyclic shift with respect to each antenna port for each of the reference shift amount candidate groups having shift amounts 0 to N-1 (N is an even number of 8 or more) that the reference shift amount can take.
- An actual shift amount to be given to a cyclic shift sequence used for scrambling of the reference signal transmitted from each antenna port is specified based on the correspondence relationship in which the amount candidate is associated and the setting information.
- the above-mentioned correspondence relationship is an offset pattern consisting of offset values of cyclic shift amount candidates associated with each antenna port with respect to reference shift amount candidates for the shift amount X (X is a natural number of 0 or more and N / 2-1 or less) And an offset pattern composed of offset values of cyclic shift amount candidates associated with each antenna port with respect to the X + N / 2 reference shift amount candidates. Then, transmission signal formation section 207 maps a reference signal obtained by multiplying the cyclic shift sequence formed based on the specified actual shift amount.
- FIG. 5 is a block diagram showing a configuration of base station 100 according to Embodiment 1 of the present invention.
- the base station 100 includes a setting unit 101, coding / modulation units 102 and 103, a transmission processing unit 104, a transmission unit 105, an antenna 106, a reception unit 107, and a reception processing unit 108. It has a data reception unit 109 and a reception quality measurement unit 110.
- the setting unit 101 generates “candidate resource setting information” for setting “candidate resources” of the setting target terminal 200.
- the candidate resource is a resource to which the setting target terminal 200 can map the SRS.
- candidate resource setting information can be divided into “time frequency resource setting information” and "code resource setting information”.
- the time frequency resource setting information includes a head subframe and a head frequency band in which the setting target terminal 200 starts setting of candidate resources, a frequency bandwidth that can be used by the setting target terminal 200, and the like.
- the code resource setting information includes “information on cyclic shift amount” and the like.
- “information on the amount of cyclic shift” is information on the amount of shift of the cyclic shift sequence used for SRS transmitted from the reference antenna port serving as a reference.
- the amount of cyclic shift for an antenna port whose antenna port identification information is zero is used as “information on the amount of cyclic shift”.
- the setting unit 101 when the SRS instructing the setting target terminal 200 to transmit is particularly the DA-SRS, the setting unit 101 generates trigger information instructing the start of transmission of the DA-SRS.
- the SRS instructing the setting target terminal 200 to transmit is particularly the DA-SRS
- the setting unit 101 generates trigger information instructing the start of transmission of the DA-SRS.
- information on a trigger for starting transmission of P-SRS is included in, for example, time-frequency resource setting information.
- the candidate resource setting information generated by the setting unit 101 as described above is transmitted as setting information to the setting target terminal 200 via the encoding / modulation unit 102, the transmission processing unit 104, and the transmission unit 105.
- trigger information is also transmitted to the setting target terminal 200 via the encoding / modulation unit 102, the transmission processing unit 104, and the transmission unit 105.
- the setting information and the trigger information are also output to the reception processing unit 108.
- the setting unit 101 generates allocation control information including resource (RB) allocation information and MCS information for one or more transport blocks (TBs).
- Allocation control information is allocation control information on uplink resources (for example, PUSCH (Physical Uplink Shared Channel)) to which uplink data are allocated, and allocation for downlink resources (for example, PDSCH (Physical Downlink Shared Channel)) to which downlink data is to be allocated Composed of control information. Then, allocation control information on uplink resources is output to coding / modulation section 102 and reception processing section 108, and allocation control information on downlink resources is output to coding / modulation section 102 and transmission processing section 104. .
- the configuration information is notified from the base station 100 to the terminal 200 as upper layer information (that is, by RRC signaling).
- allocation control information and trigger information are notified from base station 100 to terminal 200 by PDCCH (Physical Downlink Control Channel). That is, while the setting information has a relatively long notification interval (that is, it is notified at a relatively long interval), the assignment control information and the trigger information have a short notification interval (that is, they are notified at a short interval) .
- Encoding / modulation section 102 encodes and modulates the setting information, trigger information and allocation control information received from setting section 101, and outputs the obtained modulated signal to transmission processing section 104.
- Coding / modulation section 103 codes and modulates the input data signal, and outputs the obtained modulated signal to transmission processing section 104.
- Transmission processing section 104 forms a transmission signal by mapping the modulated signal received from coding / modulation section 102 and coding / modulation section 103 to the resource indicated by downlink resource allocation information received from setting section 101.
- the transmission signal is an OFDM signal
- the modulation signal is mapped to a resource indicated by downlink resource allocation information received from setting section 101 and subjected to inverse fast Fourier transform (IFFT) processing to convert it into a time waveform.
- IFFT inverse fast Fourier transform
- CP Cyclic Prefix
- the transmission unit 105 performs wireless processing (up conversion, digital analog (D / A) conversion, etc.) on the transmission signal received from the transmission processing unit 104, and transmits the signal via the antenna 106.
- wireless processing up conversion, digital analog (D / A) conversion, etc.
- the receiving unit 107 performs wireless processing (down conversion, analog-digital (A / D) conversion, and the like) on the wireless signal received through the antenna 106, and outputs the obtained received signal to the reception processing unit 108.
- wireless processing down conversion, analog-digital (A / D) conversion, and the like
- Reception processing section 108 identifies the resource to which the uplink data signal and the ACK / NACK information are mapped based on the uplink resource allocation information received from setting section 101, and is mapped to the identified resource from the received signal. Extract signal components.
- reception processing unit 108 identifies the resource to which the SRS is mapped based on the setting information and the trigger information received from the setting unit 101.
- the reception processing unit 108 specifies the time frequency resource to which the SRS is mapped based on the “time frequency resource setting information” and the trigger information. Furthermore, the reception processing unit 108 is configured to code the SRS mapped on the basis of the “code resource setting information” and the “code resource setting rule table” (that is, cyclically shift cyclic shift sequence used for SRS transmission). Identify the shift amount).
- the reception processing unit 108 generates a plurality of cyclic shift sequences (that is, a cyclic shift sequence set) respectively corresponding to the plurality of identified cyclic shift amounts. Then, the reception processing unit 108 extracts a signal component mapped to the specified time frequency resource from the received signal, and separates a plurality of code-multiplexed SRSs using the generated cyclic shift sequence set. .
- the reception processing unit 108 separates the received signal for each CW.
- the reception processing unit 108 performs an Inverse Discrete Fourier Transform (IDFT) process on the extracted signal component to convert it into a time domain signal.
- IDFT Inverse Discrete Fourier Transform
- the uplink data signal and the ACK / NACK information thus extracted by the reception processing unit 108 are output to the data reception unit 109, and the SRS is output to the reception quality measurement unit 110.
- the data reception unit 109 decodes the signal received from the reception processing unit 108. Uplink data and ACK / NACK information are thus obtained.
- Reception quality measurement section 110 measures reception quality of each frequency resource unit based on SRS received from reception processing section 108, and outputs reception quality information.
- setting information is upper layer information with a long notification interval when traffic conditions do not change in the cell of the base station 100 or when it is desired to measure average reception quality. It is preferable to be notified from the viewpoint of signaling. Further, the notification amount can be further reduced by notifying part or all of the various offset amounts as notification information. However, when it is necessary to change setting information more dynamically according to traffic conditions etc., it is preferable to notify part or all of these offset amounts by PDCCH with a short notification interval.
- FIG. 6 is a block diagram showing a configuration of terminal 200 according to Embodiment 1 of the present invention.
- the terminal 200 is an LTE-A terminal.
- the terminal 200 includes an antenna 201, a receiving unit 202, a receiving processing unit 203, a reference signal generating unit 204, a data signal generating unit 205, a transmission control unit 206, and a transmission signal forming unit 207. And a transmission unit 208.
- the receiving unit 202 performs wireless processing (down conversion, analog-digital (A / D) conversion, and the like) on a wireless signal received via the antenna 201, and outputs the obtained received signal to the reception processing unit 203.
- wireless processing down conversion, analog-digital (A / D) conversion, and the like
- the reception processing unit 203 extracts setting information, allocation control information, trigger information, and data signals included in the reception signal.
- the reception processing unit 203 outputs the setting information, the assignment control information, and the trigger information to the transmission control unit 206. Further, the reception processing unit 203 performs error detection processing on the extracted data signal, and outputs ACK / NACK information according to the error detection result to the data signal generation unit 205.
- the reference signal generation unit 204 When the reference signal generation unit 204 receives the generation instruction signal from the transmission control unit 206, the reference signal generation unit 204 generates a reference signal and outputs the reference signal to the transmission signal formation unit 207.
- Data signal generation unit 205 receives ACK / NACK information and transmission data, and generates a data signal by encoding and modulating ACK / NACK information and transmission data based on MCS information received from transmission control unit 206. .
- a data signal is generated with one codeword (CW)
- CW codeword
- MIMO transmission a data signal is generated with two (or more) codewords.
- the received signal is an OFDM signal
- the data signal generation unit 205 also performs CP removal processing and FFT processing.
- Transmission control section 206 sets a candidate resource to which the own terminal maps SRS. Specifically, transmission control section 206 specifies candidate time frequency resources based on the setting information (time frequency resource setting information) received from reception processing section 203. In addition, transmission control section 206 is a candidate code resource (that is, a cyclic shift sequence used for SRS transmission) based on the setting information (code resource setting information) received from reception processing section 203 and the “code resource setting rule table”. Specify the amount of cyclic shift). Then, upon receiving the trigger information from the reception processing unit 203, the transmission control unit 206 outputs, to the transmission signal formation unit 207, information on the amount of cyclic shift of the cyclic shift sequence used for transmission of SRS.
- the candidate code resources set in this terminal 200 will be described in detail later.
- the transmission control unit 206 determines “RS mapping resource” to which the SRS is actually mapped in the candidate time-frequency resource, and information on the determined RS mapping resource (
- RS mapping resource information may be output to transmission signal formation section 207, and a reference signal generation instruction signal is output to reference signal generation section 204.
- the transmission control unit 206 specifies “data mapping resource” to which the data signal is mapped based on the allocation control information received from the reception processing unit 203, and information on the data mapping resource (hereinafter, “data mapping resource information” Together with the transmission signal formation unit 207, and outputs the MCS information included in the allocation control information to the data signal generation unit 205.
- the transmission signal formation unit 207 maps the SRS received from the reference signal generation unit 204 on the RS mapping resource indicated by the RS mapping information. Then, transmission signal formation section 207 applies a cyclic shift corresponding to the information on the cyclic shift amount received from transmission control section 206 to the reference sequence to generate a cyclic shift sequence set, and the cyclic shift sequence set is generated. , SRS mapped to the RS mapping resource. The SRS multiplied by each of the plurality of cyclic shift sequences constituting the cyclic shift sequence set is transmitted from the corresponding antenna port. Thereby, a plurality of SRSs are code-multiplexed.
- the transmission signal formation unit 207 maps the data signal received from the data signal generation unit 205 on the data mapping resource indicated by the data mapping resource information.
- the transmission signal is formed.
- a data signal of one codeword is allocated to one layer, and in the case of MIMO transmission, data signals of two (or plural) codewords are allocated to a plurality of layers.
- the transmission signal is an OFDM signal
- the transmission signal formation unit 207 performs discrete Fourier transform (DFT) processing on the data signal, and then maps the data signal on a data mapping resource. Also, a CP is added to the formed transmission signal.
- DFT discrete Fourier transform
- the transmission unit 208 performs radio processing (up conversion, digital analog (D / A) conversion, etc.) on the transmission signal formed by the transmission signal formation unit 207, and transmits the signal via the antenna 201.
- radio processing up conversion, digital analog (D / A) conversion, etc.
- the setting unit 101 generates candidate code resource setting information for setting candidate code resources of the setting target terminal 200. Specifically, setting section 101 generates information on the shift amount of the cyclic shift sequence used for SRS transmitted from the reference antenna port of setting target terminal 200. Here, in particular, the amount of cyclic shift for an antenna port whose antenna port identification information is zero is used as information on the amount of cyclic shift.
- the candidate code resource setting information thus generated is transmitted to the terminal 200.
- Transmission control section 206 sets a candidate code resource to which the own terminal maps SRS. Specifically, transmission control section 206 performs cyclic shift of a cyclic shift sequence (that is, a cyclic shift sequence used for SRS transmission) based on the code resource setting information received from reception processing section 203 and the code resource setting rule table. Identify the amount).
- a cyclic shift sequence that is, a cyclic shift sequence used for SRS transmission
- FIG. 7 is a diagram showing a code resource setting rule table according to Embodiment 1 of the present invention.
- the code resource setting rule table four antenna port identification numbers and cyclic shift amounts corresponding to the respective antenna port identification numbers are associated with each of a plurality of cyclic shift amount candidates of the reference antenna port.
- the number of cyclic shift amount candidates is eight (0 to 7).
- the reference antenna port is an antenna port with an identification number 0.
- the basic offset patterns “0, 4, 2, 6” are applied to cyclic shift amount candidates 0 to 3 of the antenna port of identification number 0, cyclic shift amounts of the antenna port of identification number 0 are applied.
- An offset pattern different from the basic offset pattern is applied to the candidates 4 to 7.
- X is an integer of 0 or more and 3 or less.
- N is 8 or more and a power of 2
- cyclic shift amount candidate X and cyclic shift amount candidate X + N / 2 Different offset patterns are applied.
- X is an integer of 0 or more (N / 2-1) or less. Further, X may be (X ⁇ N / 2) mod N.
- the flexibility of SRS resource allocation can be improved. Also, by sharing the code resource setting rule table between base station 100 and terminal 200 in advance, base station 100 only needs to transmit information related to the amount of cyclic shift corresponding to the reference antenna port to terminal 200. It is possible to prevent the increase.
- shift amount pairs “0, 4”, “1, 5”, “2, 6”, and “3, 7” that are configured from two cyclic shift amounts.
- Any of the shift amount groups “0, 2, 4, 6” and “1, 3, 5, 7” consisting of four cyclic shift amounts can be used in four-antenna port transmission. be able to.
- the flexibility of SRS resource allocation equivalent to the case where the correspondence table shown in FIG. 2 is used can be secured.
- the terminal 3 has options other than selecting “3, 7” or “2, 6” Although there is no, in the table of FIG. 7, there are options “3, 7”, “2, 6”, and “5, 6” for the terminal 3.
- transmission signal formation section 207 applies a cyclic shift corresponding to the information on the cyclic shift amount received from transmission control section 206 to the reference sequence to generate a cyclic shift sequence set, and the cyclic shift sequence set is generated.
- SRS mapped to the RS mapping resource.
- the SRS multiplied by each of the plurality of cyclic shift sequences constituting the cyclic shift sequence set is transmitted from the corresponding antenna port. Thereby, a plurality of SRSs are code-multiplexed.
- Reception processing section 108 is based on “code resource setting information” and “code resource setting rule table”, the code resource to which SRS is mapped (that is, the cyclic shift amount of the cyclic shift sequence used for SRS transmission) Identify).
- the “code resource setting rule table” used here is the same as that used in the terminal 200.
- the reception processing unit 108 generates a plurality of cyclic shift sequences (that is, a cyclic shift sequence set) respectively corresponding to the plurality of identified cyclic shift amounts. Then, the reception processing unit 108 extracts a signal component mapped to the specified time frequency resource from the received signal, and separates a plurality of code-multiplexed SRSs using the generated cyclic shift sequence set. .
- reception processing section 203 is applied to a cyclic shift sequence used for scrambling of a reference signal transmitted from a reference antenna port among L antenna ports. .
- Setting information on the reference shift amount Then, transmission control section 206 performs cyclic shift with respect to each antenna port for each of the reference shift amount candidate groups having shift amounts 0 to N-1 (N is an even number of 8 or more) that the reference shift amount can take.
- the actual shift amount to be given to the cyclic shift sequence used for scrambling the reference signal transmitted from each antenna port is specified.
- the code resource setting rule table described above is based on the offset value of the cyclic shift amount candidate associated with each antenna port with respect to the reference shift amount candidate of the shift amount X (X is a natural number of 0 or more and N / 2-1 or less) And the offset pattern composed of the offset values of the cyclic shift amount candidates associated with each antenna port with respect to the X + N / 2 reference shift amount candidates. Then, transmission signal formation section 207 forms a cyclic shift sequence based on the specified actual shift amount.
- setting section 101 provides a reference shift provided to a cyclic shift sequence used for scrambling a reference signal transmitted from a reference antenna port among L (L is a natural number of 2 or more) antenna ports. Generate configuration information about quantities. Then, the generated setting information is transmitted to the terminal 200 via the transmission processing unit 104. In addition, reception processing section 108 performs cyclic shift with respect to each antenna port for each of the reference shift amount candidate groups having shift amounts 0 to N-1 (N is an even number of 8 or more) that the reference shift amount can take.
- the actual shift amount to be given to the cyclic shift sequence used for scrambling the reference signal transmitted from each antenna port is specified and specified
- the reference signal is received using the actual shift amount.
- the offset value of the cyclic shift amount candidate associated with each antenna port with respect to the reference shift amount candidate of the shift amount X (X is a natural number of 0 or more and N / 2-1 or less)
- the second embodiment relates to a variation of the “code resource setting rule table”.
- FIG. 8 is a diagram showing a code resource setting rule table according to Embodiment 2 of the present invention.
- the cyclic shift amount of the antenna port of identification number 0 is An offset pattern different from the basic offset pattern is applied to the candidates 4 to 7. That is, when generalized, different offset patterns are applied to the cyclic shift amount candidate X of the antenna port of the identification number 0 and the cyclic shift amount candidate X + 4. In particular, while the basic offset pattern is applied to the cyclic shift amount candidate X, the offset pattern "0, 1, 2, 3" or "0, -1, -2, -3" is applied to the cyclic shift amount candidate X + 4. Is applied.
- X is an integer of 0 or more and 3 or less.
- the occurrence of inter-sequence interference increases due to the transmission timing shift that occurs between the terminals.
- the terminal 200-1 uses shift amount group "0, 4, 2, 6"
- the terminal 200-2 uses shift amount group "1, 5, 3, 7”
- the transmission timing of the terminal 200-2 is When shifted, inter-sequence interference is given to cyclic shift sequences of all cyclic shift amounts “0, 4, 2, 6” of terminal 200-1 (see FIG. 9).
- the components of the shift amount group are continuous, it is not particularly limited to which antenna port each component is associated.
- the components of the shift amount group may be continuous. By doing this, it is possible to create a code resource setting rule table with less deviation in cyclic shift amount used for SRS.
- the third embodiment relates to a variation of the “code resource setting rule table”.
- FIG. 12 is a diagram showing a code resource setting rule table according to Embodiment 3 of the present invention.
- the basic offset pattern is applied to one of the cyclic shift amount candidate 2M and the cyclic shift amount candidate 2M + 1, while the offset pattern “0, 1, 2, 3” or “0, ⁇ 1, ⁇ 2, -3 "is applied (see FIG. 12).
- cyclic shift amount groups to which offset patterns other than the basic offset pattern are applied, cyclic corresponding to identification numbers 0 and 1 used in two-antenna transmission
- the shift amount pairs are limited to “4, 3” “5, 6” “6, 5” “7, 0”, and cyclic shift amounts 1 and 2 do not exist. That is, cyclic shift amounts 1 and 2 can not be assigned.
- the basic offset pattern is applied to one of cyclic shift amount candidate 2M and cyclic shift amount candidate 2M + 1, while the offset pattern “0, 1, 2, 3” is applied to the other.
- the offset pattern “0, 1, 2, 3” is applied to the other.
- FIG. 12 focusing on cyclic shift amount groups to which offset patterns other than the basic offset pattern are applied, cyclic shift amount pairs corresponding to identification numbers 0 and 1 used in two-antenna transmission are The biases of the cyclic shift amount are dispersed as “4, 5”, “1, 0”, “6, 7”, “3, 2”.
- cyclic shift amount candidate 2M 0, 1, etc.
- cyclic shift amount candidate 2M + 1 a reference antenna associated with an offset pattern other than the basic offset pattern
- the fourth embodiment relates to a variation of the “code resource setting rule table”.
- FIG. 14 is a diagram showing a code resource setting rule table according to Embodiment 4 of the present invention.
- the cyclic shift amounts of the antenna port of identification number 0 are applied.
- An offset pattern different from the basic offset pattern is applied to the candidates 4 to 7. That is, when generalized, different offset patterns are applied to the cyclic shift amount candidate X of the antenna port of the identification number 0 and the cyclic shift amount candidate X + 4.
- the basic offset pattern is applied to the cyclic shift amount candidate X, while the offset pattern "0, 4, 1, 5" or the offset pattern "0, 4, 3, 7" is applied to the cyclic shift amount candidate X + 4. Is applied.
- the cyclic shift amount of the antenna port of identification number 0 and the antenna port of identification number 1 is The difference and the difference between the cyclic shift amounts applied to the antenna port of identification number 2 and the antenna port of identification number 3 are common to all offset patterns.
- the offset pattern group applied to cyclic shift amount candidates 4 to 7 of the antenna port of the identification number 0 the cyclic applied to the antenna port of the identification number 1 and the antenna port of the identification number 2 There are multiple values for the difference in shift amount.
- terminals 200-1 to 4 are cyclic shift amounts
- the pairs "0, 4", "2, 6", “1, 5", "3, 7" are used respectively.
- the offset pattern “0, 4, 1, 5” or the offset pattern “0, 4, 3, 3” is applied to the cyclic shift amount candidate X + 4. Apply 7 ".
- This makes it possible to facilitate SRS resource allocation in 4-antenna port transmission even when there are two free CSs of 4-CS intervals. For example, even when the free CS is “0, 4, 1, 5”, it is possible to allocate SRS resources for 4-antenna port transmission.
- the fifth embodiment relates to a variation of the “code resource setting rule table”.
- FIG. 16 is a diagram showing a code resource setting rule table according to Embodiment 5 of the present invention.
- a and B are natural numbers other than 0 and 3 among 0 to 7 in the case of the offset patterns "0, 3, A, B", and A and B are offset numbers of "0, 5, A, B". In the case, it is a natural number other than 0 and 5 within 0-7.
- the fourth embodiment it is applied between the antenna port of identification number 0 and the antenna port of identification number 1 so that the SRS can be separated with high accuracy on the receiving side in the case of two-antenna port transmission.
- the difference between the cyclic shift amounts is designed to be 4.
- the difference value of the amount of cyclic shift to be applied between the antenna port of identification number 0 and the antenna port of identification number 1 is Preferably, a plurality of them are prepared.
- the difference in the amount of cyclic shift to be applied is 3 or 5, which is the next highest to 4 in separation performance.
- the sixth embodiment relates to a variation of the “code resource setting rule table”.
- FIG. 17 is a diagram showing a code resource setting rule table according to Embodiment 6 of the present invention.
- the cyclic shift amount of the antenna port of identification number 0 is An offset pattern different from the basic offset pattern is applied to the candidates 4 to 7. That is, when generalized, different offset patterns are applied to the cyclic shift amount candidate X of the antenna port of the identification number 0 and the cyclic shift amount candidate X + 4. In particular, the basic offset pattern is applied to the cyclic shift amount candidate X, while the offset pattern "0, 2, A, B" or "0, 6, A, B” is applied to the cyclic shift amount candidate X + 4. Be done.
- a and B are natural numbers other than 0 and 2 among 0 to 7 in the case of the offset patterns “0, 2, A, B”, and the offset patterns “0, 6, A, B, In the case of B ′ ′, it is a natural number other than 0 and 6 within 0-7.
- the cyclic shift amount applied to the antenna port of identification number 0 and the antenna of identification number 1 to improve the flexibility of SRS resource allocation while maintaining high separation performance of SRS. 3 or 5 was added as a difference value with the amount of cyclic shift applied to the port. However, if it is assumed that the difference between the amount of cyclic shift applied to the antenna port of identification number 0 and the amount of cyclic shift applied to the antenna port of identification number 1 is 3 or 5, cyclic shift amount set “0, 4,. There are cases where SRS resource allocation becomes complicated when combined with 2, 6].
- the terminal 200 assigned the cyclic shift amount set “0, 4, 2, 6” ends SRS transmission on the four antenna ports
- the resources of the cyclic shift amount set “0, 4, 2, 6” are Depending on the cyclic shift amount set, the difference value between the cyclic shift amount applied to the antenna port of identification number 0 and the cyclic shift amount applied to the antenna port of identification number 1 is 3 or 5 although vacant. Unable to allocate SRS resources. Therefore, as in the present embodiment, when emphasis is placed on the flexibility of SRS resource allocation, the amount of cyclic shift applied to the antenna port of identification number 0 and the amount of cyclic shift applied to the antenna port of identification number 1 It is preferable to add 2 or 6 as a difference value with.
- the basic offset pattern is applied to the cyclic shift amount candidate X, and the offset pattern “0, 2, 4, 6” is applied to the cyclic shift amount candidate X + 4 to obtain two transmission antenna ports with high occurrence probability.
- flexibility of SRS resource allocation can be secured, and in 4 transmission antenna port transmission with a relatively low probability of occurrence, CS spacing can be maximized between antenna ports, so separation accuracy of SRS can be maximized.
- the seventh embodiment relates to a variation of the “code resource setting rule table”.
- FIG. 18 is a diagram showing a code resource setting rule table according to Embodiment 7 of the present invention.
- different offset patterns are applied to the cyclic shift amount candidate X of the antenna port of the identification number 0 and the cyclic shift amount candidate X + 4. Furthermore, different offset patterns are applied to cyclic shift amount candidate groups (that is, 0, 2, 4, 6) having cyclic shift amounts of even antenna ports of the identification number 0. Then, basic offset patterns “0, 4, 2, 6” are applied to one cyclic shift amount candidate of the cyclic shift amount candidate group having an even cyclic shift amount of the antenna port of the identification number 0. In FIG. 18, in particular, basic offset patterns “0, 4, 2, 6” are associated with cyclic shift amount candidate 0 of the antenna port of identification number 0.
- the offset pattern "0, 1, 2, 3” is associated with the cyclic shift amount candidate 2 of the antenna port of the identification number 0, and the offset pattern of the cyclic shift amount candidate 4 of the antenna port of the identification number 0 is “0, 2, 4, 6” is associated, and offset pattern “0, ⁇ 1, ⁇ 2, ⁇ 3” is associated with the cyclic shift amount candidate 6 of the antenna port of the identification number 0.
- the antenna port of identification number 0 is selected depending on whether the candidate cyclic shift amount of the antenna port of identification number 0 is X or X + 2.
- the pair of the amount of cyclic shift associated with each other and the amount of cyclic shift associated with the antenna port of identification number 1 are different from each other.
- cyclic shift amount candidate groups that is, 0, 2, 4, 6) of cyclic positions of even number of cyclic shift amounts of the antenna port of identification number 0 are cyclic shift amounts.
- the amount of cyclic shift constituting the set is the same (see FIG. 19).
- the cyclic shift amount candidate X of the antenna port of identification number 0 and the cyclic shift amount candidate X + 4 are associated with different offset patterns, and at the antenna port of identification number 0 Different offset patterns are also associated with cyclic shift amount candidate groups (that is, 0, 2, 4, and 6) in which the cyclic shift amounts are even. By doing this, it is possible to improve the flexibility of SRS resource allocation without increasing the amount of signaling for cyclic shift amount notification.
- the eighth embodiment is different from the first to seventh embodiments and aims to improve the flexibility of SRS resource allocation in the frequency domain.
- the base station and terminal according to the eighth embodiment have the same basic configuration as the base station 100 and the terminal 200 according to the first embodiment, and therefore will be described with reference to FIGS.
- setting section 101 generates “candidate resource setting information” for setting “candidate resource” of setting target terminal 200.
- the candidate resource setting information can be divided into “time resource setting information” and “code frequency resource setting information”.
- the reception processing unit 108 identifies the resource to which the SRS is mapped based on the setting information and the trigger information received from the setting unit 101.
- the reception processing unit 108 identifies the time resource to which the SRS is mapped based on the “time resource setting information” and the trigger information. Furthermore, the reception processing unit 108 further performs code shift resource mapping to the SRS (that is, cyclic shift used for SRS transmission) based on the “code frequency resource setting information” and the “code frequency resource setting rule table”. Identify the cyclic shift amount and frequency of the sequence.
- the reception processing unit 108 generates a plurality of cyclic shift sequences (that is, a cyclic shift sequence set) respectively corresponding to the plurality of identified cyclic shift amounts. Then, the reception processing unit 108 extracts a signal component mapped to the specified time frequency resource from the received signal, and separates a plurality of code-multiplexed SRSs using the generated cyclic shift sequence set. .
- transmission control section 206 sets a candidate resource to which the own terminal maps SRS.
- the transmission control unit 206 specifies candidate time resources based on the setting information (time resource setting information) received from the reception processing unit 203.
- the transmission control unit 206 is used for transmitting candidate code frequency resources (that is, transmitting SRSs) based on the setting information (code frequency resource setting information) received from the reception processing unit 203 and the “code frequency resource setting rule table”.
- the cyclic shift amount and frequency of the cyclic shift sequence are specified.
- the transmission control unit 206 receives the trigger information from the reception processing unit 203, the transmission control unit 206 outputs, to the transmission signal formation unit 207, information and frequency related to the amount of cyclic shift of the cyclic shift sequence used for transmission of SRS.
- the candidate frequency resources set in this terminal 200 will be described in detail later.
- the transmission signal formation unit 207 maps the SRS received from the reference signal generation unit 204 on the RS mapping resource indicated by the RS mapping information. Then, transmission signal formation section 207 applies a cyclic shift corresponding to the information on the cyclic shift amount received from transmission control section 206 to the reference sequence to generate a cyclic shift sequence set, and the cyclic shift sequence set is generated. , SRS mapped to the RS mapping resource. The SRS multiplied by each of the plurality of cyclic shift sequences constituting the cyclic shift sequence set is transmitted from the corresponding antenna port. Thereby, a plurality of SRSs are code-multiplexed.
- base station 100 and terminal 200 of Embodiment 8 having the above configuration will be described.
- processing for setting candidate code resources and candidate frequency resources for setting target terminal 200, transmission processing of SRS using candidate code resources and candidate frequency resources by terminal 200, and transmission from terminal 200 by base station 100 The reception process of the SRS will be described.
- terminal 200 transmits SRS using two antenna ports or four antenna ports.
- the setting unit 101 generates candidate code frequency resource setting information for setting candidate code resources and candidate frequency resources of the setting target terminal 200. Specifically, setting section 101 generates information on the shift amount of the cyclic shift sequence used for SRS transmitted from the reference antenna port of setting target terminal 200. Here, in particular, the amount of cyclic shift for an antenna port whose antenna port identification information is zero is used as information on the amount of cyclic shift.
- the candidate code frequency resource setting information generated in this way is transmitted to the terminal 200.
- Transmission control section 206 sets a candidate code frequency resource to which the own terminal maps SRS. Specifically, transmission control section 206 selects candidate code frequency resources based on the code frequency resource setting information received from reception processing section 203 and the code frequency resource setting rule table (that is, the cyclic shift sequence used for SRS transmission). Specify the cyclic shift amount and frequency of
- FIG. 20 is a diagram showing a code frequency resource setting rule table according to Embodiment 8 of the present invention.
- the code frequency resource setting rule table four antenna port identification numbers are associated with cyclic shift amounts and frequencies corresponding to the respective antenna port identification numbers for each of a plurality of cyclic shift amount candidates of the reference antenna port. .
- the number of cyclic shift amount candidates is eight (0 to 7).
- fixed offset patterns “0, 4, 2, 6” are applied to all cyclic shift amount candidates 0 to 7 of the antenna port of identification number 0. . Further, in FIG.
- one frequency band (frequency 1 in the figure) is associated with all antenna ports, while identification number 0 1 frequency band (in the figure, frequency 1) is associated with antenna port of identification number 0 and identification number 1 in cyclic shift amount candidates 4 to 7 of antenna port of identification number 2 and identification One frequency band (frequency 2 in the figure) is associated with the antenna port number 3. That is, when generalized, different frequency patterns are applied to the cyclic shift amount candidate X of the antenna port of the identification number 0 and the cyclic shift amount candidate X + 4.
- X is an integer of 0 or more and 3 or less.
- FIG. 21 is a diagram showing another example of the code frequency resource setting rule table according to Embodiment 8 of the present invention.
- one frequency band (frequency 1 in FIG. 21) is associated with all antenna ports
- One frequency band (frequency 1 in the figure) is associated with antenna ports of identification number 0 and identification number 2 in cyclic shift amount candidates 4 to 7 of the antenna port
- One frequency band (frequency 2 in the figure) is associated with three antenna ports.
- each of the frequency 1 and the frequency 2 described above may be a subcarrier block consisting of continuous subcarrier groups, or may be a subcarrier group consisting of staggered subcarrier groups (for example, Comb in LTE) good.
- frequency 1 may be replaced with Comb #
- frequency 2 may be replaced with Comb # 1. That is, even if only one Comb is used for cyclic shift amount candidates 0 to 3 of the antenna port of identification number 0, and only a plurality of Combs are used for cyclic shift amount candidates 4 to 7 of the antenna port of identification number 0 Good.
- the fixed offset patterns "0, 4, 2, 6" may have different orders such as "0, 2, 4, 6".
- the same processing may be performed by using a formula or the like. For example, the following equation may be used instead of the figure.
- FIG. 20 can also be expressed by equation (1).
- FIG. 21 can also be expressed by equation (2).
- different offset patterns are associated with the cyclic shift amount candidate X of the antenna port of the identification number 0 and the cyclic shift amount candidate X + 4.
- the method of improving the flexibility of SRS resource allocation is not limited to this. That is, as described above, the flexibility of SRS resource allocation can be improved also by associating different frequency patterns with the cyclic shift amount candidate X of the antenna port with the identification number 0 and the cyclic shift amount candidate X + 4. Can.
- the frequency 1 and the frequency 2 can also be regarded as offset amounts in the frequency domain.
- the terminal 200 transmits the SRS only on the Comb # 0, while the base station 100 transmits the SRS.
- the terminal 200 transmits the SRS only in the Comb # 1.
- some of the plurality of cyclic shift amount candidates of the reference antenna port may be associated with trigger information (that is, trigger bits in PDCCH).
- the cyclic shift amount candidate 0 of the reference antenna port is associated with trigger information 1 of the PDCCH according to the setting information
- the cyclic shift amount candidate 4 of the reference antenna port is associated with the trigger information 2 of the PDCCH.
- base station 100 notifies trigger information 1 of PDCCH to terminal 200
- terminal 200 transmits SRS using a cyclic shift amount set corresponding to cyclic shift amount candidate 0 of the reference antenna port.
- the terminal 200 transmits SRS using a cyclic shift amount set in which cyclic shift amount candidates 4 of the reference antenna port are associated.
- SRS for example, DA-SRS, P-SRS
- code multiplexing is performed using cyclic shift sequences. If there is, it is applicable.
- the antenna port in each of the above embodiments refers to a logical antenna (antenna group) composed of one or more physical antennas. That is, the antenna port does not necessarily refer to one physical antenna, but may refer to an array antenna or the like configured of a plurality of antennas. For example, it is not defined how many physical antennas the antenna port is configured, but defined as a minimum unit in which a terminal station can transmit a reference signal. Also, the antenna port may be defined as the smallest unit by which the weighting of the precoding vector is multiplied.
- the present invention is not limited to this.
- the number of notification bits may be 4 bits, and cyclic shift amount candidates may be 0 to 15.
- the offset amount set “0, 4, 2, 6” may be “0, 8, 4, 12”, etc. good.
- the amount of cyclic shift of the antenna ports of identification numbers 1 to 3 is not limited to the values in the figure.
- the offset amount set “0, 2, 4, 6” may be used.
- the present invention has been described by way of hardware as an example, but the present invention can also be realized by software in cooperation with hardware.
- each functional block employed in the description of the aforementioned embodiment may typically be implemented as an LSI constituted by an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all. Although an LSI is used here, it may be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- a programmable field programmable gate array FPGA
- a reconfigurable processor may be used which can reconfigure connection and setting of circuit cells in the LSI.
- the transmission apparatus, the reception apparatus, the transmission method, and the reception method of the present invention are useful as those that improve the flexibility of SRS resource allocation without increasing the amount of signaling for cyclic shift amount notification.
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Abstract
Description
[通信システムの概要]
本発明の実施の形態1に係る通信システムは、基地局100と端末200とを有する。基地局100は、LTE-A基地局であり、端末200は、LTE-A端末である。また、端末200は、L(Lは、2以上の自然数)個のアンテナポートの少なくとも一部のそれぞれから、基本系列に巡回シフトを施すことにより得られる巡回シフト系列によってスクランブルされたリファレンス信号を送信する。そして、基地局100は、L(Lは、2以上の自然数)個のアンテナポートの少なくとも一部のそれぞれから、基本系列に巡回シフトを施すことにより得られる巡回シフト系列によってスクランブルされたリファレンス信号を受信する。
図5は、本発明の実施の形態1に係る基地局100の構成を示すブロック図である。図5において、基地局100は、設定部101と、符号化・変調部102,103と、送信処理部104と、送信部105と、アンテナ106と、受信部107と、受信処理部108と、データ受信部109と、受信品質測定部110とを有する。
図6は、本発明の実施の形態1に係る端末200の構成を示すブロック図である。ここでは、端末200は、LTE-A端末である。
以上の構成を有する基地局100及び端末200の動作について説明する。ここでは、特に、設定対象端末200に対する候補符号リソースの設定処理、端末200による候補符号リソースを用いたSRSの送信処理、及び、基地局100による端末200から送信されたSRSの受信処理について説明する。また、特に、端末200が2つのアンテナポート又は4つのアンテナポートを用いてSRSを送信する場合について説明する。
設定部101は、設定対象端末200の候補符号リソースを設定するための候補符号リソース設定情報を生成する。具体的には、設定部101は、設定対象端末200の基準アンテナポートから送信されるSRSに対して用いられる巡回シフト系列のシフト量に関する情報を生成する。ここでは、特に、アンテナポート識別情報がゼロであるアンテナポートについての巡回シフト量が、巡回シフト量に関する情報として用いられる。
送信制御部206は、自端末がSRSをマッピングする候補符号リソースを設定する。具体的には、送信制御部206は、受信処理部203から受け取る符号リソース設定情報と、符号リソース設定ルールテーブルとに基づいて候補符号リソース(つまり、SRSの送信に用いられる巡回シフト系列の巡回シフト量)を特定する。
受信処理部108は、「符号リソース設定情報」と、「符号リソース設定ルールテーブル」とに基づいて、SRSがマッピングされている符号リソース(つまり、SRSの送信に用いられる巡回シフト系列の巡回シフト量)を特定する。ここで用いられる「符号リソース設定ルールテーブル」は、端末200において用いられるものと同じである。
実施の形態2は、「符号リソース設定ルールテーブル」のバリエーションに関する。
実施の形態3は、「符号リソース設定ルールテーブル」のバリエーションに関する。
実施の形態4は、「符号リソース設定ルールテーブル」のバリエーションに関する。
実施の形態5は、「符号リソース設定ルールテーブル」のバリエーションに関する。
実施の形態6は、「符号リソース設定ルールテーブル」のバリエーションに関する。
実施の形態7は、「符号リソース設定ルールテーブル」のバリエーションに関する。
実施の形態8は、実施の形態1~7と異なり、周波数領域内における、SRSリソース割当の柔軟性の向上を目指すものである。実施の形態8の基地局及び端末は、実施の形態1の基地局100及び端末200と基本構成が共通するので、図5,6を援用して説明する。
設定部101は、設定対象端末200の候補符号リソース及び候補周波数リソースを設定するための候補符号周波数リソース設定情報を生成する。具体的には、設定部101は、設定対象端末200の基準アンテナポートから送信されるSRSに対して用いられる巡回シフト系列のシフト量に関する情報を生成する。ここでは、特に、アンテナポート識別情報がゼロであるアンテナポートについての巡回シフト量が、巡回シフト量に関する情報として用いられる。
送信制御部206は、自端末がSRSをマッピングする候補符号周波数リソースを設定する。具体的には、送信制御部206は、受信処理部203から受け取る符号周波数リソース設定情報と、符号周波数リソース設定ルールテーブルとに基づいて候補符号周波数リソース(つまり、SRSの送信に用いられる巡回シフト系列の巡回シフト量及び周波数)を特定する。
(1)上記各実施の形態においては、基準アンテナポートの複数の巡回シフト量候補の内の一部をトリガー情報(つまり、PDCCHにおけるトリガー用ビット)と対応付けても良い。例えば、設定情報により、PDCCHのトリガー情報1に基準アンテナポートの巡回シフト量候補0を対応づけ、PDCCHのトリガー情報2に基準アンテナポートの巡回シフト量候補4を対応づける。そして、基地局100がPDCCHのトリガー情報1を端末200に対して通知すれば、端末200は、基準アンテナポートの巡回シフト量候補0を対応づけられた巡回シフト量セットを用いてSRSを送信し、基地局100がPDCCHのトリガー情報2を端末200に対して通知すれば、端末200は、基準アンテナポートの巡回シフト量候補4を対応づけられた巡回シフト量セットを用いてSRSを送信する。
101 設定部
102,103 符号化・変調部
104 送信処理部
105,208 送信部
106,201 アンテナ
107,202 受信部
108,203 受信処理部
109 データ受信部
110 受信品質測定部
200 端末
204 リファレンス信号生成部
205 データ信号生成部
206 送信制御部
207 送信信号形成部
Claims (32)
- L(Lは、2以上の自然数)個のアンテナポートの少なくとも一部のそれぞれから、巡回シフト系列によってスクランブルされたリファレンス信号を送信する送信装置であって、
前記L個のアンテナポートの内の基準アンテナポートから送信されるリファレンス信号のスクランブルに用いられる巡回シフト系列に与えられる、基準シフト量を示す設定情報を受信する受信手段と、
前記設定情報と、前記基準シフト量0からN-1(Nは、8以上の偶数)を持つ基準シフト量候補群のそれぞれにおいて各アンテナポートに対して巡回シフト量候補が対応付けられた対応関係とに基づいて、各アンテナポートから送信されるリファレンス信号のスクランブルに用いる巡回シフト系列に与えられるシフト量を特定する特定手段と、
前記特定されたシフト量に基づいて巡回シフト系列を形成する形成手段と、
を具備し、
前記対応関係は、基準シフト量X(Xは、0以上N/2-1以下の自然数)の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンと、基準シフト量X+N/2の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンとが異なる、
送信装置。 - 前記基準シフト量0からN/2-1を持つ基準シフト量候補群に対応するオフセットパターンは、同一の基本オフセットパターンである、
請求項1に記載の送信装置。 - 前記Lは4であり、
前記Nは8であり、
前記基本オフセットパターンは、“0,4,2,6”である、
請求項2に記載の送信装置。 - 前記Lは4であり、
前記Nは8であり、
前記基準シフト量Xを持つ基準シフト量候補に対応するオフセットパターン及び前記基準シフト量X+4を持つ基準シフト量候補に対応するオフセットパターンのいずれかは、“0,1,2,3”又は“0,-1,-2,-3”である、
請求項1に記載の送信装置。 - 前記基準シフト量0からN-1(Nは、8以上の偶数)を持つ基準シフト量候補群の内の、基準シフト量2M+1(Mは、0からN/2までの整数)の基準シフト量候補に対応するオフセットパターンと、基準シフト量2M+2の基準シフト量候補に対応するオフセットパターンとは、異なる、
請求項1に記載の送信装置。 - 前記基準シフト量2M+1の基準シフト量候補に対応するオフセットパターン、及び、前記基準シフト量2M+2の基準シフト量候補に対応するオフセットパターンのいずれかは、基本オフセットパターンである、
請求項5に記載の送信装置。 - 前記Lは4であり、
前記Nは8であり、
前記基本オフセットパターンは、“0,4,2,6”である、
請求項6に記載の送信装置。 - 前記Lは4であり、
前記Nは8であり、
前記基本オフセットパターン以外のオフセットパターンと対応する基準シフト量候補群の内で連続する値を持つ2つの基準シフト量候補の内、値の小さい基準シフト量候補のオフセットパターンは、“0,-1,-2,-3”であり、値の大きい基準シフト量候補のオフセットパターンは、“0,1,2,3”である、
請求項6に記載の送信装置。 - 前記Lは4であり、
前記Nは8であり、
前記基準シフト量Xを持つ基準シフト量候補に対応するオフセットパターン及び前記基準シフト量X+4を持つ基準シフト量候補に対応するオフセットパターンのいずれかは、“0,4,1,5”又は“0,4,3,7”である、
請求項1に記載の送信装置。 - 2個のアンテナポートで前記リファレンス信号を送信する場合に用いられる、前記基準アンテナポートを含む前記2個のアンテナポートに対する前記対応関係では、前記基準シフト量Xを持つ基準シフト量候補に対応するオフセットパターン及び前記基準シフト量X+4を持つ基準シフト量候補に対応するオフセットパターンの内の一方は、“0,4”であり、他方は、“0,3”又は“0,5”である、
請求項1に記載の送信装置。 - 2個のアンテナポートで前記リファレンス信号を送信する場合に用いられる、前記基準アンテナポートを含む前記2個のアンテナポートに対する前記対応関係では、前記基準シフト量Xを持つ基準シフト量候補に対応するオフセットパターン及び前記基準シフト量X+4を持つ基準シフト量候補に対応するオフセットパターンの内の一方は、“0,4”であり、他方は、“0,2”又は“0,6”である、
請求項1に記載の送信装置。 - L(Lは、2以上の自然数)個のアンテナポートの少なくとも一部のそれぞれから、巡回シフト系列によってスクランブルされたリファレンス信号を受信する受信装置であって、
前記L個のアンテナポートの内の基準アンテナポートから送信されるリファレンス信号のスクランブルに用いられる巡回シフト系列に与えられる、基準シフト量を示す設定情報を生成する生成手段と、
前記設定情報を前記リファレンス信号の送信装置へ送信する送信手段と、
前記設定情報と、前記基準シフト量0からN-1(Nは、8以上の偶数)を持つ基準シフト量候補群のそれぞれにおいて各アンテナポートに対して巡回シフト量候補が対応付けられた対応関係とに基づいて、各アンテナポートから送信されるリファレンス信号のスクランブルに用いる巡回シフト系列に与えられるシフト量を特定し、前記特定されたシフト量を用いて前記リファレンス信号を受信する受信手段と、
を具備し、
前記対応関係は、基準シフト量X(Xは、0以上N/2-1以下の自然数)の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンと、基準シフト量X+N/2の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンとが異なる、
受信装置。 - L(Lは、2以上の自然数)個のアンテナポートの少なくとも一部のそれぞれから、巡回シフト系列によってスクランブルされたリファレンス信号を送信する送信方法であって、
前記L個のアンテナポートの内の基準アンテナポートから送信されるリファレンス信号のスクランブルに用いられる巡回シフト系列に与えられる、基準シフト量を示す設定情報を受信し、
前記設定情報と、前記基準シフト量0からN-1(Nは、8以上の偶数)を持つ基準シフト量候補群のそれぞれにおいて各アンテナポートに対して巡回シフト量候補が対応付けられた対応関係とに基づいて、各アンテナポートから送信されるリファレンス信号のスクランブルに用いる巡回シフト系列に与えられるシフト量を特定し、
前記特定されたシフト量に基づいて巡回シフト系列を形成し、
前記対応関係は、基準シフト量X(Xは、0以上N/2-1以下の自然数)の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンと、基準シフト量X+N/2の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンとが異なる、
送信方法。 - L(Lは、2以上の自然数)個のアンテナポートの少なくとも一部のそれぞれから、巡回シフト系列によってスクランブルされたリファレンス信号を受信する受信方法であって、
前記L個のアンテナポートの内の基準アンテナポートから送信されるリファレンス信号のスクランブルに用いられる巡回シフト系列に与えられる、基準シフト量を示す設定情報を前記リファレンス信号の送信装置へ送信し、
前記設定情報と、前記基準シフト量0からN-1(Nは、8以上の偶数)を持つ基準シフト量候補群のそれぞれにおいて各アンテナポートに対して巡回シフト量候補が対応付けられた対応関係とに基づいて、各アンテナポートから送信されるリファレンス信号のスクランブルに用いる巡回シフト系列に与えられるシフト量を特定し、前記特定されたシフト量を用いて前記リファレンス信号を受信し、
前記対応関係は、基準シフト量X(Xは、0以上N/2-1以下の自然数)の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンと、基準シフト量X+N/2の基準シフト量候補に対する、各アンテナポートに対応付けられた巡回シフト量候補のオフセット値から成るオフセットパターンとが異なる、
受信方法。 - 巡回シフト量に関する情報を用いて生成された参照信号を、第一対応関係または第二対応関係に基づいて決定された、複数のアンテナポートの各々に対応する周波数リソースにマッピングする信号形成部と、
前記複数のアンテナポートの各々に対応する前記周波数リソースにマッピングされた前記参照信号を送信する送信部と、
を具備し、
前記巡回シフト量に関する情報がXの場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第一対応関係と、前記巡回シフト量に関する情報がX+N/2(但し、Xは0以上N/2-1以下の整数、Nは前記巡回シフト量の候補数を示す。)の場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第二対応関係と、は異なる、
送信装置。 - 前記第一対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一であり、前記第二対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一でない、
請求項15に記載の送信装置。 - 前記第一対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一であり、
前記第二対応関係における複数のアンテナポートのうち、奇数のアンテナポートに対応する周波数リソースと偶数のアンテナポートに対応する周波数リソースとは異なる、
請求項15に記載の送信装置。 - 前記第一対応関係における複数のアンテナポートの各々に対応する周波数リソースは、前記第二対応関係における偶数のアンテナポートに対応する周波数リソースと同一である、
請求項15に記載の送信装置。 - 前記複数のアンテナポートの数が2である場合、前記第一対応関係における全てのアンテナポートに対応する周波数リソースは、前記第二対応関係における全てのアンテナポートに対応する周波数リソースは同じであり、
前記複数のアンテナポートの数が4である場合、前記第一対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一であり、前記第二対応関係における複数のアンテナポートのうち、奇数のアンテナポートに対応する周波数リソースと偶数のアンテナポートに対応する周波数リソースとは異なる、
請求項15に記載の送信装置。 - 前記第一対応関係における全アンテナポートに対応する周波数リソースは同一であり、
前記第二対応関係において、2つのアンテナポートの巡回シフト量の間隔が[N/2]となる当該2つのアンテナポートに対応する周波数リソースは同一であり、2つのアンテナポートの巡回シフト量の間隔が[N/4]となる当該2つのアンテナポートに対応する周波数リソースは異なる、
請求項15に記載の送信装置。 - 前記巡回シフト量に関する情報はアンテナポート番号が0の巡回シフト量に相当し、前記Nは8であり、前記Xは0~3である、
請求項15に記載の送信装置。 - 前記周波数リソースは、櫛型(Comb)状のサブキャリアグループである、
請求項15に記載の送信装置。 - 第一対応関係または第二対応関係に基づいて決定された、複数のアンテナポートの各々に対応する周波数リソースにマッピングされ、巡回シフト量に関する情報を用いて生成された参照信号を受信する受信部と、
前記参照信号を用いて回線品質を測定する回線品質測定部と、
を具備し、
前記巡回シフト量に関する情報がXの場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第一対応関係と、前記巡回シフト量に関する情報がX+N/2(但し、Xは0以上N/2-1以下の整数、Nは前記巡回シフト量の候補数を示す。)の場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第二対応関係と、は異なる、
受信装置。 - 前記第一対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一であり、前記第二対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一でない、
請求項23に記載の受信装置。 - 前記第一対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一であり、
前記第二対応関係における複数のアンテナポートのうち、奇数のアンテナポートに対応する周波数リソースと偶数のアンテナポートに対応する周波数リソースとは異なる、
請求項23に記載の受信装置。 - 前記第一対応関係における複数のアンテナポートの各々に対応する周波数リソースは、前記第二対応関係における偶数のアンテナポートに対応する周波数リソースと同一である、
請求項23に記載の受信装置。 - 前記複数のアンテナポートの数が2である場合、前記第一対応関係における全てのアンテナポートに対応する周波数リソースは、前記第二対応関係における全てのアンテナポートに対応する周波数リソースは同じであり、
前記複数のアンテナポートの数が4である場合、前記第一対応関係において、複数のアンテナポートの各々に対応する周波数リソースは同一であり、前記第二対応関係における複数のアンテナポートのうち、奇数のアンテナポートに対応する周波数リソースと偶数のアンテナポートに対応する周波数リソースとは異なる、
請求項23に記載の受信装置。 - 前記第一対応関係における全アンテナポートに対応する周波数リソースは同一であり、
前記第二対応関係において、2つのアンテナポートの巡回シフト量の間隔が[N/2]となる当該2つのアンテナポートに対応する周波数リソースは同一であり、2つのアンテナポートの巡回シフト量の間隔が[N/4]となる当該2つのアンテナポートに対応する周波数リソースは異なる、
請求項23に記載の受信装置。 - 前記巡回シフト量に関する情報はアンテナポート番号が0の巡回シフト量に相当し、前記Nは8であり、前記Xは0~3である、
請求項23に記載の受信装置。 - 前記周波数リソースは、櫛型(Comb)状のサブキャリアグループである、
請求項23に記載の受信装置。 - 巡回シフト量に関する情報を用いて生成された参照信号を、第一対応関係または第二対応関係に基づいて決定された、複数のアンテナポートの各々に対応する周波数リソースにマッピングし、
前記複数のアンテナポートの各々に対応する前記周波数リソースにマッピングされた前記参照信号を送信し、
前記巡回シフト量に関する情報がXの場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第一対応関係と、前記巡回シフト量に関する情報がX+N/2(但し、Xは0以上N/2-1以下の整数、Nは前記巡回シフト量の候補数を示す。)の場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第二対応関係と、は異なる、
送信方法。 - 第一対応関係または第二対応関係に基づいて決定された、複数のアンテナポートの各々に対応する周波数リソースにマッピングされ、巡回シフト量に関する情報を用いて生成された参照信号を受信し、
前記参照信号を用いて回線品質を測定し、
前記巡回シフト量に関する情報がXの場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第一対応関係と、前記巡回シフト量に関する情報がX+N/2(但し、Xは0以上N/2-1以下の整数、Nは前記巡回シフト量の候補数を示す。)の場合における複数のアンテナポートの各々と周波数リソースとの対応関係である前記第二対応関係と、は異なる、
受信方法。
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JP2020520585A (ja) * | 2017-05-04 | 2020-07-09 | オッポ広東移動通信有限公司Guangdong Oppo Mobile Telecommunications Corp., Ltd. | アップリンク信号の伝送パラメータを確定する方法、端末及びネットワーク装置 |
US11070400B2 (en) | 2017-05-04 | 2021-07-20 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for determining transmission parameters of uplink signal, terminal and network device |
JP7009505B2 (ja) | 2017-05-04 | 2022-01-25 | オッポ広東移動通信有限公司 | アップリンク信号の伝送パラメータを確定する方法、端末及びネットワーク装置 |
US11637722B2 (en) | 2017-05-04 | 2023-04-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for determining transmission parameters of uplink signal, terminal and network device |
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