WO2018229958A1 - ユーザ端末及び無線通信方法 - Google Patents
ユーザ端末及び無線通信方法 Download PDFInfo
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- WO2018229958A1 WO2018229958A1 PCT/JP2017/022229 JP2017022229W WO2018229958A1 WO 2018229958 A1 WO2018229958 A1 WO 2018229958A1 JP 2017022229 W JP2017022229 W JP 2017022229W WO 2018229958 A1 WO2018229958 A1 WO 2018229958A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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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
- H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
-
- 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
Definitions
- the present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- Non-patent Document 1 LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + ( 5G (plus) and New-RAT (Radio Access Technology) are also being considered.
- LTE-A LTE-Advanced
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- 5G + 5G (plus)
- New-RAT Radio Access Technology
- a demodulation reference signal for example, DMRS (Demodulation Reference Signal)
- DMRS Demodulation Reference Signal
- time direction bundling a plurality of slots (subframes) in the time direction (time direction bundling) is being studied.
- effects such as improvement of channel estimation accuracy and improvement of Doppler tolerance can be obtained.
- One aspect of the present invention is to provide a user terminal and a wireless communication method capable of controlling Doppler fluctuation effectively by controlling Additional-DMRS mapping in the second and subsequent slots when time direction bundling is applied. .
- the user terminal includes a receiving unit that receives a downlink signal including a control channel, front-loaded DMRS (Demodulation Reference Signal), and Additional DMRS, in which a plurality of slots are bundled, and the downlink signal
- the presence / absence or mapping position of the Additional / DMRS mapping is selected based on the rules for the Additional / DMRS mapping in the second slot and thereafter.
- the Additional DMR based on the rule. Specify the presence or absence of mapping of S and the mapping position.
- the mapping of Additional DMRS can be controlled after the second slot, and the Doppler fluctuation can be effectively corrected.
- the radio communication system includes at least radio base station 10 shown in FIG. 1 and user terminal 20 shown in FIG. The user terminal 20 is connected to the radio base station 10.
- the radio base station 10 transmits a DL control signal to the user terminal 20 using a downlink control channel (for example, PDCCH: PhysicalPhysDownlink Control Channel), and a downlink data channel (for example, downlink shared channel: PDSCH: Physical Downlink).
- DL data signal and Front-loaded DMRS are transmitted using Shared (Channel).
- the user terminal 20 uses the uplink control channel (for example, PUCCH: Physical Uplink Control Channel) or the uplink data channel (for example, uplink shared channel: PUSCH: Physical Uplink Shared Channel) to the radio base station 10.
- a control signal is transmitted, and an UL data signal and Front-loaded DMRS are transmitted using an uplink data channel (for example, uplink shared channel: PUSCH: Physical Uplink Shared Shared Channel).
- the downlink channel and uplink channel transmitted and received by the radio base station 10 and the user terminal 20 are not limited to the above PDCCH, PDSCH, PUCCH, PUSCH, and the like, for example, PBCH (Physical Broadcast Channel), RACH (Random Access Channel). Other channels may be used.
- PBCH Physical Broadcast Channel
- RACH Random Access Channel
- the DL / UL signal waveform generated in the radio base station 10 and the user terminal 20 may be a signal waveform based on OFDM (Orthogonal (Frequency Division Multiplexing) modulation, and may be SC-FDMA (Single Carrier). -Frequency (Division-Multiple Access) or DFT-S-OFDM (DFT-Spread-OFDM)), or other signal waveforms.
- OFDM Orthogonal (Frequency Division Multiplexing) modulation
- SC-FDMA Single Carrier
- FIG. 1 and FIG. 2 description of components for generating a signal waveform (for example, DFT processing unit, IFFT processing unit, CP adding unit, CP removing unit, FFT processing unit, IDFT processing unit, etc.) is omitted. Yes.
- transmission / reception can be performed between the radio base station 10 and the user terminal 20 using time direction bundling (hereinafter simply referred to as “Bundling”).
- FIG. 1 is a diagram illustrating an example of the overall configuration of a radio base station 10 according to the present embodiment.
- a radio base station 10 illustrated in FIG. 1 includes a scheduler 101, a transmission signal generation unit 102, an encoding / modulation unit 103, a mapping unit 104, a transmission unit 105, an antenna 106, a reception unit 107, and a control unit. 108, a channel estimation unit 109, and a demodulation / decoding unit 110 are employed.
- the scheduler 101 performs scheduling (for example, resource allocation, antenna port allocation) of DL signals (DL data signal, DL control signal, Front-loaded DMRS, etc.). Further, the scheduler 101 selects whether or not the mapping of the Additional DMRS to the DL signal is necessary according to the channel quality (factor of quality deterioration such as Doppler fluctuation and propagation environment). Further, the scheduler 101 selects the presence / absence of additional-DMRS mapping and the mapping position in the second and subsequent slots when downlink bundling is applied. Then, the scheduler 101 performs downlink Additional DMRS scheduling according to the selection result.
- scheduling for example, resource allocation, antenna port allocation
- DL signals DL data signal, DL control signal, Front-loaded DMRS, etc.
- the scheduler 101 selects whether or not the mapping of the Additional DMRS to the DL signal is necessary according to the channel quality (factor of quality deterioration such as Doppler fluctuation and propagation environment). Further, the scheduler 101 selects the presence / absence of
- the scheduler 101 performs scheduling (for example, resource allocation, antenna port allocation) of UL signals (UL data signal, UL control signal, Front-loaded DMRS, etc.). Also, the scheduler 101 selects whether or not to map AdditionalAddDMRS to the UL signal according to the channel quality. Further, the scheduler 101 selects the presence / absence of additional-DMRS mapping and the mapping position in the second and subsequent slots when uplink bundling is applied. Then, the scheduler 101 performs uplink Additional DMRS scheduling according to the selection result.
- scheduling for example, resource allocation, antenna port allocation
- UL signals UL data signal, UL control signal, Front-loaded DMRS, etc.
- the scheduler 101 selects whether or not to map AdditionalAddDMRS to the UL signal according to the channel quality. Further, the scheduler 101 selects the presence / absence of additional-DMRS mapping and the mapping position in the second and subsequent slots when uplink bundling is applied. Then, the scheduler 101 performs uplink Additional DMRS scheduling according to the selection result.
- mapping rules for Additional DMRS after the second slot when Bundling is applied will be described later.
- the scheduler 101 outputs scheduling information indicating the scheduling result to the transmission signal generation unit 102, the mapping unit 104, and the control unit 108.
- the scheduler 101 sets the MCS (coding rate, modulation scheme, etc.) of the DL data signal and the UL data signal based on the channel quality between the radio base station 10 and the user terminal 20, for example, and MCS information Are output to the transmission signal generation unit 102 and the encoding / modulation unit 103.
- MCS is not limited to being set by the radio base station 10 and may be set by the user terminal 20.
- the radio base station 10 may receive MCS information from the user terminal 20 (not shown).
- the transmission signal generation unit 102 generates a transmission signal (including a DL data signal and a DL control signal).
- the DL control signal includes scheduling information output from the scheduler 101 (eg, DL data signal resource allocation information) or downlink control information (DCI: Downlink Control Information) including MCS information.
- DCI Downlink Control Information
- the transmission signal generation unit 102 outputs the generated transmission signal to the encoding / modulation unit 103.
- the encoding / modulation unit 103 performs encoding processing and modulation processing on the transmission signal input from the transmission signal generation unit 102 based on the MCS information input from the scheduler 101, for example. Encoding / modulating section 103 outputs the modulated transmission signal to mapping section 104.
- mapping section 104 Based on the scheduling information (for example, DL resource allocation and / or port allocation) input from scheduler 101, mapping section 104 converts a transmission signal input from encoding / modulation section 103 to a predetermined radio resource (DL resource). ). Further, the mapping unit 104 maps reference signals (for example, front-loaded DMRS, additional DMRS) to predetermined radio resources (DL resources) based on the scheduling information. The mapping unit 104 outputs the DL signal mapped to the radio resource to the transmission unit 105.
- DL resource for example, DL resource allocation and / or port allocation
- the transmission unit 105 performs transmission processing such as up-conversion and amplification on the DL signal input from the mapping unit 104 and transmits a radio frequency signal (DL signal) from the antenna 106.
- transmission processing such as up-conversion and amplification on the DL signal input from the mapping unit 104 and transmits a radio frequency signal (DL signal) from the antenna 106.
- DL signal radio frequency signal
- the reception unit 107 performs reception processing such as amplification and down-conversion on the radio frequency signal (UL signal) received by the antenna 106 and outputs the UL signal to the control unit 108.
- reception processing such as amplification and down-conversion on the radio frequency signal (UL signal) received by the antenna 106 and outputs the UL signal to the control unit 108.
- the control unit 108 Based on the scheduling information (UL resource allocation and / or port allocation) input from the scheduler 101, the control unit 108 converts the UL data signal, the front-loaded DMRS, and the additional DMRS from the UL signal input from the receiving unit 107. Separate (demapping). Then, the control unit 108 outputs the UL data signal to the channel estimation unit 109.
- the channel estimation unit 109 performs channel estimation using Front-loaded DMRS and Additional DMRS, and outputs a channel estimation value as an estimation result to the demodulation / decoding unit 110.
- the demodulation / decoding unit 110 performs demodulation and decoding processing on the UL data signal input from the control unit 108 based on the channel estimation value input from the channel estimation unit 109.
- the demodulation / decoding unit 110 transfers the demodulated UL data signal to an application unit (not shown).
- the application unit performs processing related to a layer higher than the physical layer or the MAC layer.
- FIG. 2 is a diagram illustrating an example of the overall configuration of the user terminal 20 according to the present embodiment.
- 2 includes an antenna 201, a receiving unit 202, a control unit 203, a channel estimation unit 204, a demodulation / decoding unit 205, a transmission signal generation unit 206, an encoding / modulation unit 207, and the like.
- a configuration including a mapping unit 208 and a transmission unit 209 is employed.
- user terminal 20 performs reception processing of a radio frequency signal received at an antenna port assigned to user terminal 20 itself.
- the receiving unit 202 performs reception processing such as amplification and down-conversion on the radio frequency signal (DL signal) received by the antenna 201, and outputs the DL signal to the control unit 203.
- the DL signal includes at least a DL data signal, a DL control signal, and a front-loaded DMRS, and may include an Additional DMRS.
- the control unit 203 separates (demappings) the DL control signal, Front-loaded DMRS, and Additional DMRS from the DL signal input from the receiving unit 202.
- the control unit 203 specifies the presence / absence and mapping position of Additional DMRS in each slot based on a rule described later. Then, control section 203 outputs the DL control signal to demodulation / decoding section 205, and outputs front-loaded DMRS and additional DMRS to channel estimation section 204.
- control unit 203 demultiplexes the DL data signal from the DL signal based on the scheduling information (for example, DL resource allocation information) input from the demodulation / decoding unit 205, and demodulates the DL data signal. Output to the decoding unit 205.
- scheduling information for example, DL resource allocation information
- the channel estimation unit 204 performs channel estimation using the separated front-loaded DMRS and additional DMRS, and outputs a channel estimation value as an estimation result to the demodulation / decoding unit 205.
- the demodulation / decoding unit 205 demodulates the DL control signal input from the control unit 203. Further, the demodulation / decoding unit 205 performs a decoding process (for example, a blind detection process) on the demodulated DL control signal. Demodulation / decoding section 205 uses control section 203 and mapping information (such as DL / UL resource allocation, Front-loaded DMRS, Additional DMRS mapping settings) obtained by decoding the DL control signal to be transmitted to the own apparatus. And outputs the MCS information for the UL data signal to the encoding / modulation unit 207.
- mapping information such as DL / UL resource allocation, Front-loaded DMRS, Additional DMRS mapping settings
- the demodulation / decoding unit 205 converts the DL data signal input from the control unit 203 based on the channel estimation value input from the control unit 203 and the MCS information for the DL data signal included in the DL control signal. On the other hand, demodulation and decoding processing are performed. Further, the demodulation / decoding unit 205 transfers the demodulated DL data signal to an application unit (not shown). The application unit performs processing related to a layer higher than the physical layer or the MAC layer.
- the transmission signal generation unit 206 generates a transmission signal (including a UL data signal or a UL control signal), and outputs the generated transmission signal to the encoding / modulation unit 207.
- the encoding / modulation unit 207 performs encoding processing and modulation processing on the transmission signal input from the transmission signal generation unit 206 based on, for example, MCS information input from the demodulation / decoding unit 205. Encoding / modulating section 207 outputs the modulated transmission signal to mapping section 208.
- mapping section 208 maps the transmission signal input from encoding / modulation section 207 to a predetermined radio resource (UL resource). . Further, the mapping unit 208 converts a reference signal (for example, Front-loaded DMRS, Additional DMRS) into a predetermined radio resource (UL resource) based on scheduling information (for example, mapping setting of Front-loaded DMRS and Additional DMRS). Map. The mapping unit 208 selects the presence / absence and mapping position of AdditionalAddDMRS in each slot based on a rule described later.
- a reference signal for example, Front-loaded DMRS, Additional DMRS
- mapping unit 208 selects the presence / absence and mapping position of AdditionalAddDMRS in each slot based on a rule described later.
- the mapping unit 208 outputs the UL signal mapped to the radio resource to the transmission unit 209.
- the transmission unit 209 performs transmission processing such as up-conversion and amplification on the UL signal (including at least the UL data signal, Front-loaded DMRS, and Additional DMRS) input from the mapping unit 208, and transmits a radio frequency signal (UL Signal) is transmitted from the antenna 201.
- UL Signal radio frequency signal
- Additional DMRS mapping rules for the second and subsequent slots when Bundling is applied will be described in detail with reference to FIGS.
- channel quality quality degradation factors such as Doppler fluctuation and propagation environment.
- RU Resource Units
- resource blocks also called resource blocks, resource block pairs, etc.
- RU has a configuration in which 168 resource elements (RE: Resource Element) are arranged in the time direction and 12 in the frequency direction.
- RE resource elements
- One RE is a radio resource area defined by one symbol and one subcarrier. That is, one RU is composed of 14 symbols and 12 subcarriers.
- the 14 symbols in the time direction of the RU are called SB1 to SB14 in order from the left.
- the 12 subcarriers in the frequency direction of the RU are called SC1 to SC12 in order from the bottom.
- the radio base station 10 (user terminal 20) bundling three slots, and controls each slot from the top of each subcarrier to 2 symbols (SB 1, SB 2). Channels are mapped, Front-loaded DMRS is mapped to the third symbol (SB3), and Additional DMRS is mapped to the ninth symbol (SB9) in the first slot.
- the radio base station 10 (user terminal 20) maps the Additional DMRS to the same position as the symbol position where the Additional DMRS is mapped in the first slot in each slot after the second slot bundled. To do.
- the radio base station 10 maps Additional ⁇ ⁇ ⁇ ⁇ ⁇ DMRS to the ninth symbol (SB9) in the second and third slots as in the first slot.
- the receiving-side user terminal 20 (radio base station 10) performs channel estimation using the Front-loaded DMRS and Additional DMRS mapped to each slot.
- the Additional DMRS is not mapped in the first slot, the Additional DMRS is not mapped in the second slot and subsequent slots.
- the insertion position is shifted backward or forward. Also good.
- the radio base station 10 (user terminal 20) is a position set in a predetermined (Predefine) position or RRC (Radio Resource Control) in each slot after the second slot bundled. Always map Additional DMRS to.
- the eleventh symbol (SB11) is set as the additional DMRS mapping position in the second slot and the ninth symbol (SB9) is set as the additional DMRS mapping position in the third slot.
- the radio base station 10 (user terminal 20) assigns the eleventh symbol (SB11) in the second slot and the ninth symbol (SB9) in the third slot according to the above setting.
- Map Additional DMRS Map Additional DMRS.
- the receiving-side user terminal 20 (radio base station 10) performs channel estimation using the Front-loaded DMRS and Additional DMRS mapped to each slot.
- the mapping position of Additional DMRS set in advance may be different for each slot or may be common to all slots.
- the insertion position may be shifted backward or forward when colliding with another reference signal (for example, CSI-RS) when mapping Additional DMRS to the second slot.
- another reference signal for example, CSI-RS
- the radio base station 10 (user terminal 20) does not map the Additional DMRS to the slots after the second slot bundled.
- the radio base station 10 (user terminal 20) does not map Additional ⁇ ⁇ ⁇ ⁇ ⁇ DMRS to the second slot and the third slot.
- the receiving-side user terminal 20 (radio base station 10) performs channel estimation using the Front-loaded DMRS mapped to each slot and the Additional DMRS mapped to the first slot.
- the radio base station 10 appropriately determines the presence / absence of additional DMRS mapping and the mapping position in each slot after the second slot bundled. For example, the greater the Doppler variation, the greater the number of slots mapping Additional DMRS.
- the radio base station 10 notifies the user terminal 20 of the presence / absence and mapping position of AdditionalAddDMRS by signaling.
- the user terminal 20 separates and maps AdditionalAddDMRS according to the content notified by signaling.
- Additional-DMRS mapping can be flexibly performed according to the propagation environment with the user terminal 20, the moving speed of the user terminal 20, the processing capability, and the like.
- the radio base station 10 decides not to map Additional ⁇ ⁇ ⁇ ⁇ ⁇ DMRS to the eleventh symbol (SB11) of the second slot and not to map Additional DMRS to the third slot, and 20 is notified by signaling.
- the user terminal 20 (radio base station 10) on the receiving side performs channel estimation using the Front-loaded DMRS mapped to each slot and the Additional DMRS mapped to the first and second slots.
- the additional DMRS mapping position may be set differently for each slot, or may be common to all slots.
- the radio base station 10 may notify the signaling for each slot, or may collectively notify the second slot and subsequent slots. Further, the radio base station 10 may notify the signaling after the second slot by the same method as that of the first slot, or may be notified by a method different from that of the first slot. For example, the first slot may be notified dynamically by DCI, and the second and subsequent slots may be notified statically by RRC.
- said signaling is good also as individual signaling for every user terminal 20, every allocation RB, every subband, every resource block group (RBG), every component carrier (CC), every cell, every carrier frequency It may be common signaling.
- the signaling may be any of RRC signaling, MAC signaling, and PHYY signaling. Further, the above signaling may be notified periodically or dynamically (non-periodically).
- the radio base station 10 and the user terminal 20 indicate the presence / absence and mapping position of the Additional DMRS in each slot after the second slot when the time direction Bundling is applied. Control according to mapping rules. Thereby, Doppler fluctuation can be effectively corrected when Bundling is applied.
- the mapping position of Additional DMRS in each slot after the second slot is associated with or set in advance to the mapping location of Additional DMRS in the first slot.
- the presence / absence and mapping position of AdditionalRSDMRS in each slot after the second slot is appropriately determined and notified by signaling.
- Additional-DMRS mapping can be flexibly performed according to the propagation environment and the like.
- the symbol position of the control channel is not limited to that shown in FIGS. 3 to 6, and may be mapped only to some subcarrier symbols (RE), for example.
- RE subcarrier symbols
- mapping rules of Additional DMRS to be applied may be notified from each radio base station 10 to the user terminal 20 by signaling, or may be described in the specification. Further, the rules described in the specification may be changed by signaling.
- a plurality of AdditionalRSDMRS mapping rules may be applied in combination in a bundled slot.
- mapping pattern in the RU having a configuration in which 168 REs are arranged in the time direction and 12 in the frequency direction has been described, but the present invention is not limited to this.
- the present invention is also applied to mapping of front-loaded DMRS in a resource allocation unit called a mini-slot whose number of symbols is 1 to 14.
- FIG. 7 shows an example in which the first mapping rule is applied to a 3-symbol minislot.
- the radio base station 10 (user terminal 20) maps the control channel to the first symbol (SB1) and maps the front-loaded DMRS to the second symbol (SB2) in each slot, In the slot, Additional DMRS is mapped to the third symbol (SB3).
- the radio base station 10 (user terminal 20) maps Additional DMRS to the third symbol (SB3) in the second and third slots.
- the receiving-side user terminal 20 (radio base station 10) performs channel estimation using the front-loaded DMRS and the additional DMRS mapped to each slot.
- FIG. 8 shows an example in which the third mapping rule is applied to a 5-symbol mini-slot.
- the radio base station 10 (user terminal 20) maps the control channel to the first symbol (SB1) in each slot, maps the Front-loaded DMRS to the second symbol (SB2), In the slot, Additional DMRS is mapped to the fifth symbol (SB5).
- the radio base station 10 (user terminal 20) does not map Additional DMRS to the second and third slots.
- the receiving-side user terminal 20 (radio base station 10) performs channel estimation using the front-loaded DMRS mapped to each slot and the additional slot DMRS of the first slot.
- the symbol position of the minislot is not limited to that shown in FIGS.
- Bundling when Bundling is applied, minislots having different numbers of symbols may be mixed. In this case, even when the first mapping rule is applied, another mapping rule may be applied to a slot having a different number of symbols from the first slot.
- FIG. 9 shows an example of an additional DMRS mapping pattern in a 3-symbol mini-slot.
- FIG. 9 shows a case where the control channel is mapped to the first symbol of all subcarriers.
- FIG. 9A shows that the front-loaded DMRS is mapped to the first, third, fifth, seventh, ninth, and eleventh subcarriers of the second symbol (SB2), and the third symbol (SB3).
- An example in which Additional DMRS is mapped to the first, third, fifth, seventh, ninth, and eleventh subcarriers is shown.
- FIG. 9B Front-loaded DMRS is mapped to the third, seventh, and eleventh subcarriers of the second symbol (SB2), and the third, seventh, and eleventh of the third symbol (SB3).
- An example in which AdditionalAddDMRS is mapped to subcarriers is shown.
- FIG. 9C shows that the front-loaded DMRS is mapped to the third, fourth, fifth, and sixth subcarriers of the second symbol (SB2), and the third and fourth symbols of the third symbol (SB3).
- the example in which Additional ⁇ ⁇ DMRS is mapped to the fifth and sixth subcarriers is shown.
- FIG. 9D Front-loaded DMRS is mapped to the third and ninth subcarriers of the second symbol (SB2), and AdditionalAddDMRS is assigned to the third and ninth subcarriers of the third symbol (SB3).
- a mapped example is shown.
- FIG. 9D Front-loaded DMRS is mapped to the third and ninth subcarriers of the second symbol (SB2), and AdditionalAddDMRS is assigned to the third and ninth subcarriers of the third symbol (SB3).
- FIG. 9E Front-loaded DMRS is mapped to the sixth and seventh subcarriers of the second symbol (SB2), and AdditionalAddDMRS is mapped to the sixth and seventh subcarriers of the third symbol (SB3).
- FIG. 9 (f) shows an example in which Front-loaded DMRS is mapped to the sixth subcarrier of the second symbol (SB2) and AdditionalAddDMRS is mapped to the sixth subcarrier of the third symbol (SB3).
- FIG. 10 shows an example of an additional DMRS mapping pattern in any one of 4 to 14 symbol minislots.
- FIG. 10 shows a case where the control channel is mapped to the first symbol of all subcarriers.
- FIG. 10A shows that the front-loaded DMRS is mapped to the first, third, fifth, seventh, ninth, and eleventh subcarriers of the second symbol (SB2), and the i-th (i is from 3).
- SB2 the front-loaded DMRS is mapped to the first, third, fifth, seventh, ninth, and eleventh subcarriers of the second symbol (SB2), and the i-th (i is from 3).
- AdditionalAddDMRS is mapped to the first, third, fifth, seventh, ninth, and eleventh subcarriers of the symbol (SBi) of any one of 13).
- FIG. 10 (b) shows that the front-loaded DMRS is mapped to the first, third, fifth, seventh, ninth, and eleventh subcarriers of the second and third symbols (SB2, SB3), and the jth (J is an integer from 4 to 12) and an example where AdditionalAddDMRS is mapped to the first, third, fifth, seventh, ninth and eleventh subcarriers of the j + 1th symbol (SBj, SBj + 1) Indicates.
- FIG. 10C shows that the front-loaded DMRS is mapped to the first, second, seventh, and eighth subcarriers of the second symbol (SB2), and the first and second of the i-th symbol (SBi).
- FIG. 10D shows that the front-loaded DMRS is mapped to the first, second, seventh, and eighth subcarriers of the second and third symbols (SB2, SB3), and the jth and j + 1th symbols ( An example in which AdditionalAddDMRS is mapped to the first, second, seventh, and eighth subcarriers of SBj, SBj + 1) is shown.
- any one of the first to fourth Additional DMRS mapping rules described above may be commonly applied to all user terminals 20 located in the same cell. You may select suitably for every 20th. Further, a mapping rule common to all the radio base stations 10 may be applied, or a mapping rule may be appropriately selected for each radio base station 10.
- each radio base station 10 may select the above-described first to fourth Additional DMRS mapping rules according to the data channel. For example, each radio base station 10 may select a predetermined mapping rule when mapping Additional DMRS of a subframe including a specific data channel.
- the specific data channel is, for example, a data channel including System Information, a data channel including SRB (Signaling Radio Bearer), a data channel including Hand over command, and a DCI (Downlink Control Information) transmitted in Common search space. Data channel, and data channel including Activation command.
- the radio base station 10 may map Additional DMRS for each layer so as to be orthogonal between layers (layer multiplexing), or perform mapping (layer transmission) in common to the layers. Also good. Further, the radio base station 10 may set the antenna port number in common with any of the additional-DMRS port numbers, or may set a different port number.
- AdditionalAddDMRS may be mapped to m (m is a plurality) slots at a rate of once.
- Front-loaded DMRS and Additional DMRS may be referred to as demodulation RSs.
- Front-loaded DMRS and Additional DMRS may be referred to as a reference signal or the like.
- each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
- a wireless base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the wireless communication method of the present invention.
- FIG. 11 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- processor 1001 may be implemented by one or more chips.
- Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation and communication by the communication device 1004, or This is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.
- predetermined software program
- the processor 1001 performs computation and communication by the communication device 1004, or This is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the above-described scheduler 101, control units 108 and 203, transmission signal generation units 102 and 206, encoding / modulation units 103 and 207, mapping units 104 and 208, channel estimation units 109 and 204, demodulation / decoding units 110 and 205 Etc. may be realized by the processor 1001.
- the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- a program program code
- the scheduler 101 of the radio base station 10 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001.
- the processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.
- the memory 1002 is a computer-readable recording medium and includes at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
- the storage 1003 may be referred to as an auxiliary storage device.
- the storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- a network device for example, the transmission units 105 and 209, the antennas 106 and 201, the reception units 107 and 202, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
- DSP digital signal processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof.
- RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- SUPER 3G IMT-Advanced
- 4G 5G
- FRA Full Radio Access
- W-CDMA Wideband
- GSM registered trademark
- CDMA2000 Code Division Multiple Access 2000
- UMB User Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX
- IEEE 802.20 UWB (Ultra-WideBand
- the present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.
- the specific operation assumed to be performed by the base station (radio base station) in this specification may be performed by the upper node in some cases.
- various operations performed for communication with a terminal may be performed by the base station and / or other network nodes other than the base station (e.g., It is obvious that this can be performed by MME (Mobility Management Entity) or S-GW (Serving Gateway).
- MME Mobility Management Entity
- S-GW Serving Gateway
- Information, signals, and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.
- Input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.
- the determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).
- software, instructions, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- DSL digital subscriber line
- wireless technology such as infrared, wireless and microwave.
- Information, signal Information, signals, etc. described herein may be represented using any of a variety of different technologies.
- data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of
- the channel and / or symbol may be a signal.
- the signal may be a message.
- the component carrier (CC) may be called a carrier frequency, a cell, or the like.
- radio resource may be indicated by an index.
- a base station can accommodate one or more (eg, three) cells (also referred to as sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, indoor small base station RRH: Remote Radio Head) can also provide communication services.
- the term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. Further, the terms “base station”, “eNB”, “gNB”, “cell”, and “sector” may be used interchangeably herein.
- a base station may also be referred to in terms such as a fixed station, NodeB, eNodeB (eNB), gNodeB, access point, femtocell, small cell and the like.
- a user terminal is a mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile by a person skilled in the art It may also be referred to as a terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, UE (User Equipment), or some other appropriate terminology.
- determining may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment, calculation, calculation, processing, derivation, investigating, looking up (eg, table , Searching in a database or another data structure), considering ascertaining as “determining”, “deciding”, and the like.
- determination and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as “determined” or "determined”.
- determination and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.
- connection means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements.
- the coupling or connection between the elements may be physical, logical, or a combination thereof.
- the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples
- electromagnetic energy such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.
- the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot depending on an applied standard. Also, Front-loaded DMRS may be called another corresponding name.
- RS Reference Signal
- Front-loaded DMRS may be called another corresponding name.
- the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- the radio frame may be composed of one or a plurality of frames in the time domain.
- One or more frames in the time domain may be referred to as subframes, time units, etc.
- a subframe may further be composed of one or more slots in the time domain.
- the slot may be further configured with one or a plurality of symbols (OFDM (Orthogonal-Frequency-Division-Multiplexing) symbol, SC-FDMA (Single-Carrier-Frequency-Division-Multiple-Access) symbol, etc.) in the time domain.
- OFDM Orthogonal-Frequency-Division-Multiplexing
- SC-FDMA Single-Carrier-Frequency-Division-Multiple-Access
- the radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting a signal. Radio frames, subframes, slots, minislots, and symbols may be called differently corresponding to each.
- the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each mobile station) to each mobile station.
- the minimum time unit of scheduling may be called TTI (Transmission Time Interval).
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot may be called a TTI
- one minislot may be called a TTI
- the resource unit is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. In the time domain of the resource unit, it may include one or a plurality of symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource units.
- the resource unit may also be called a resource block (RB: Resource Block), a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, a scheduling unit, a frequency unit, or a subband. Further, the resource unit may be composed of one or a plurality of REs.
- 1 RE may be any resource (for example, the smallest resource unit) smaller than a resource unit serving as a resource allocation unit, and is not limited to the name RE.
- the structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, the number of minislots included in the subframe, the symbols and resource blocks included in the slots, The number and the number of subcarriers included in the resource block can be variously changed.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.
- One embodiment of the present invention is useful for a mobile communication system.
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Abstract
Description
本実施の形態に係る無線通信システムは、少なくとも、図1に示す無線基地局10、及び、図2に示すユーザ端末20を備える。ユーザ端末20は、無線基地局10に接続している。
図1は、本実施の形態に係る無線基地局10の全体構成の一例を示す図である。図1に示す無線基地局10は、スケジューラ101と、送信信号生成部102と、符号化・変調部103と、マッピング部104と、送信部105と、アンテナ106と、受信部107と、制御部108と、チャネル推定部109と、復調・復号部110と、を含む構成を採る。
図2は、本実施の形態に係るユーザ端末20の全体構成の一例を示す図である。図2に示すユーザ端末20は、アンテナ201と、受信部202と、制御部203と、チャネル推定部204と、復調・復号部205と、送信信号生成部206と、符号化・変調部207と、マッピング部208と、送信部209と、を含む構成を採る。そして、ユーザ端末20は、ユーザ端末20自身に割り当てられたアンテナポートにて受信した無線周波数信号の受信処理を行う。
次に、図3乃至図6を用いて、Bundlingの適用時における第2スロット以降のAdditional DMRSのマッピング規則の具体例について詳細に説明する。なお、第1スロットでは、チャネル品質(ドップラー変動、伝搬環境等の品質劣化要因)に応じて、Additional DMRSがマッピングされる。
第1のマッピング規則では、無線基地局10(ユーザ端末20)が、Bundlingされた第2スロット以降の各スロットにおいて、第1スロットでAdditional DMRSがマッピングされたシンボル位置と同じ位置にAdditional DMRSをマッピングする。
第2のマッピング規則では、無線基地局10(ユーザ端末20)が、Bundlingされた第2スロット以降の各スロットにおいて、予め決められた(Predefine)位置あるいはRRC(Radio Resource Control)で設定された位置にAdditional DMRSを常にマッピングする。
第3のマッピング規則では、無線基地局10(ユーザ端末20)が、Bundlingされた第2スロット以降のスロットには、Additional DMRSをマッピングしない。
第4のマッピング規則では、無線基地局10が、Bundlingされた第2スロット以降の各スロットにおいて、Additional DMRSのマッピングの有無およびマッピング位置を適宜決定する。例えば、ドップラー変動が大きいほど、Additional DMRSをマッピングするスロット数を増やす。
このように、本実施の形態では、無線基地局10およびユーザ端末20は、時間方向Bundlingの適用時において、第2スロット以降の各スロットにおけるAdditional DMRSのマッピングの有無およびマッピング位置を、Additional DMRSのマッピングに関する規則に則って制御する。これにより、Bundling適用時に、ドップラー変動を効果的に補正できる。
上述した例では、168個のREが時間方向に14個、周波数方向に12個並んだ構成を有するRUにおけるマッピングパターンについて説明したが、本発明はこれに限定されない。例えば、シンボル数が1~14のいずれかであるミニスロットと呼ばれるリソース割り当て単位におけるFront-loaded DMRSのマッピングに対しても、本発明は適用される。
図7は、上記第1のマッピング規則を、3シンボルのミニスロットに適用した場合の一例を示す。図7の例では、無線基地局10(ユーザ端末20)が、各スロットにおいて先頭シンボル(SB1)に制御チャネルをマッピングし、2番目のシンボル(SB2)にFront-loaded DMRSをマッピングし、第1スロットにおいて3番目のシンボル(SB3)にAdditional DMRSをマッピングしている。
図8は、上記第3のマッピング規則を、5シンボルのミニスロットに適用した場合の一例を示す。図8の例では、無線基地局10(ユーザ端末20)が、各スロットにおいて先頭シンボル(SB1)に制御チャネルをマッピングし、2番目のシンボル(SB2)にFront-loaded DMRSをマッピングし、第1スロットにおいて5番目のシンボル(SB5)にAdditional DMRSをマッピングしている。
次に、ミニスロットにおけるAdditional DMRSのマッピングパターンの例を図9乃至図10を用いて説明する。
図9は、3シンボルのミニスロットにおけるAdditional DMRSのマッピングパターンの例を示す。なお、図9では、いずれも、全てのサブキャリアの先頭シンボルに制御チャネルがマッピングされる場合を示す。
図10は、4~14シンボルのいずれかのミニスロットにおけるAdditional DMRSのマッピングパターンの例を示す。なお、図10では、いずれも、全てのサブキャリアの先頭シンボルに制御チャネルがマッピングされる場合を示す。
なお、本実施の形態では、上述の第1乃至第4のAdditional DMRSのマッピング規則のいずれかを、同一セル内に位置する全てのユーザ端末20に対して共通に適用しても良く、ユーザ端末20毎に適宜選択しても良い。また、全ての無線基地局10に共通のマッピング規則を適用しても良く、無線基地局10毎にマッピング規則を適宜選択しても良い。
なお、上記実施の形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的及び/又は論理的に結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/又は無線)で接続し、これら複数の装置により実現されてもよい。
また、情報の通知は、本明細書で説明した態様/実施形態に限られず、他の方法で行われてもよい。例えば、情報の通知は、物理レイヤシグナリング(例えば、DCI(Downlink Control Information)、UCI(Uplink Control Information))、上位レイヤシグナリング(例えば、RRC(Radio Resource Control)シグナリング、MAC(Medium Access Control)シグナリング、報知情報(MIB(Master Information Block)、SIB(System Information Block)))、その他の信号又はこれらの組み合わせによって実施されてもよい。また、RRCシグナリングは、RRCメッセージと呼ばれてもよく、例えば、RRC接続セットアップ(RRC Connection Setup)メッセージ、RRC接続再構成(RRC Connection Reconfiguration)メッセージなどであってもよい。
本明細書で説明した各態様/実施形態は、LTE(Long Term Evolution)、LTE-A(LTE-Advanced)、SUPER 3G、IMT-Advanced、4G、5G、FRA(Future Radio Access)、W-CDMA(登録商標)、GSM(登録商標)、CDMA2000、UMB(Ultra Mobile Broadband)、IEEE 802.11(Wi-Fi)、IEEE 802.16(WiMAX)、IEEE 802.20、UWB(Ultra-WideBand)、Bluetooth(登録商標)、その他の適切なシステムを利用するシステム及び/又はこれらに基づいて拡張された次世代システムに適用されてもよい。
本明細書で説明した各態様/実施形態の処理手順、シーケンス、フローチャートなどは、矛盾の無い限り、順序を入れ替えてもよい。例えば、本明細書で説明した方法については、例示的な順序で様々なステップの要素を提示しており、提示した特定の順序に限定されない。
本明細書において基地局(無線基地局)によって行われるとした特定動作は、場合によってはその上位ノード(upper node)によって行われることもある。基地局を有する1つまたは複数のネットワークノード(network nodes)からなるネットワークにおいて、端末との通信のために行われる様々な動作は、基地局および/または基地局以外の他のネットワークノード(例えば、MME(Mobility Management Entity)またはS-GW(Serving Gateway)などが考えられるが、これらに限られない)によって行われ得ることは明らかである。上記において基地局以外の他のネットワークノードが1つである場合を例示したが、複数の他のネットワークノードの組み合わせ(例えば、MMEおよびS-GW)であってもよい。
情報及び信号等は、上位レイヤ(または下位レイヤ)から下位レイヤ(または上位レイヤ)に出力され得る。複数のネットワークノードを介して入出力されてもよい。
入出力された情報等は特定の場所(例えば、メモリ)に保存されてもよいし、管理テーブルで管理してもよい。入出力される情報等は、上書き、更新、または追記され得る。出力された情報等は削除されてもよい。入力された情報等は他の装置に送信されてもよい。
判定は、1ビットで表される値(0か1か)によって行われてもよいし、真偽値(Boolean:trueまたはfalse)によって行われてもよいし、数値の比較(例えば、所定の値との比較)によって行われてもよい。
ソフトウェアは、ソフトウェア、ファームウェア、ミドルウェア、マイクロコード、ハードウェア記述言語と呼ばれるか、他の名称で呼ばれるかを問わず、命令、命令セット、コード、コードセグメント、プログラムコード、プログラム、サブプログラム、ソフトウェアモジュール、アプリケーション、ソフトウェアアプリケーション、ソフトウェアパッケージ、ルーチン、サブルーチン、オブジェクト、実行可能ファイル、実行スレッド、手順、機能などを意味するよう広く解釈されるべきである。
本明細書で説明した情報、信号などは、様々な異なる技術のいずれかを使用して表されてもよい。例えば、上記の説明全体に渡って言及され得るデータ、命令、コマンド、情報、信号、ビット、シンボル、チップなどは、電圧、電流、電磁波、磁界若しくは磁性粒子、光場若しくは光子、又はこれらの任意の組み合わせによって表されてもよい。
本明細書で使用する「システム」および「ネットワーク」という用語は、互換的に使用される。
また、本明細書で説明した情報、パラメータなどは、絶対値で表されてもよいし、所定の値からの相対値で表されてもよいし、対応する別の情報で表されてもよい。例えば、無線リソースはインデックスで指示されるものであってもよい。
基地局(無線基地局)は、1つまたは複数(例えば、3つ)の(セクタとも呼ばれる)セルを収容することができる。基地局が複数のセルを収容する場合、基地局のカバレッジエリア全体は複数のより小さいエリアに区分でき、各々のより小さいエリアは、基地局サブシステム(例えば、屋内用の小型基地局RRH:Remote Radio Head)によって通信サービスを提供することもできる。「セル」または「セクタ」という用語は、このカバレッジにおいて通信サービスを行う基地局、および/または基地局サブシステムのカバレッジエリアの一部または全体を指す。さらに、「基地局」、「eNB」、「gNB」、「セル」、および「セクタ」という用語は、本明細書では互換的に使用され得る。基地局は、固定局(fixed station)、NodeB、eNodeB(eNB)、gNodeB、アクセスポイント(access point)、フェムトセル、スモールセルなどの用語で呼ばれる場合もある。
ユーザ端末は、当業者によって、移動局、加入者局、モバイルユニット、加入者ユニット、ワイヤレスユニット、リモートユニット、モバイルデバイス、ワイヤレスデバイス、ワイヤレス通信デバイス、リモートデバイス、モバイル加入者局、アクセス端末、モバイル端末、ワイヤレス端末、リモート端末、ハンドセット、ユーザエージェント、モバイルクライアント、クライアント、UE(User Equipment)、またはいくつかの他の適切な用語で呼ばれる場合もある。
本明細書で使用する「判断(determining)」、「決定(determining)」という用語は、多種多様な動作を包含する場合がある。「判断」、「決定」は、例えば、判定(judging)、計算(calculating)、算出(computing)、処理(processing)、導出(deriving)、調査(investigating)、探索(looking up)(例えば、テーブル、データベースまたは別のデータ構造での探索)、確認(ascertaining)した事を「判断」「決定」したとみなす事などを含み得る。また、「判断」、「決定」は、受信(receiving)(例えば、情報を受信すること)、送信(transmitting)(例えば、情報を送信すること)、入力(input)、出力(output)、アクセス(accessing)(例えば、メモリ中のデータにアクセスすること)した事を「判断」「決定」したとみなす事などを含み得る。また、「判断」、「決定」は、解決(resolving)、選択(selecting)、選定(choosing)、確立(establishing)、比較(comparing)などした事を「判断」「決定」したとみなす事を含み得る。つまり、「判断」「決定」は、何らかの動作を「判断」「決定」したとみなす事を含み得る。
本明細書で説明した各態様/実施形態は単独で用いてもよいし、組み合わせて用いてもよいし、実行に伴って切り替えて用いてもよい。また、所定の情報の通知(例えば、「Xであること」の通知)は、明示的に行うものに限られず、暗黙的(例えば、当該所定の情報の通知を行わない)ことによって行われてもよい。
20 ユーザ端末
101 スケジューラ
102,206 送信信号生成部
103,207 符号化・変調部
104,208 マッピング部
105,209 送信部
106,201 アンテナ
107,202 受信部
108,203 制御部
109,204 チャネル推定部
110,205 復調・復号部
Claims (6)
- 複数のスロットがバンドリングされ、制御チャネル、Front-loaded DMRS(Demodulation Reference Signal)およびAdditional DMRSを含む下りリンク信号を受信する受信部と、
前記下りリンク信号から前記制御チャネル、前記Front-loaded DMRSおよび前記Additional DMRSを分離する制御部と、
前記Front-loaded DMRSおよび前記Additional DMRSを用いてチャネル推定値を算出するチャネル推定部と、
を具備し、
先頭スロットにおいて、チャネル品質に応じて、前記Additional DMRSがマッピングされ、
第2スロット以降において、前記Additional DMRSのマッピングに関する規則に基づいて、前記Additional DMRSのマッピングの有無あるいはマッピング位置が選択され、
前記制御部は、前記第2スロット以降において、前記規則に基づいて前記Additional DMRSのマッピングの有無およびマッピング位置を特定する、
ユーザ端末。 - 前記規則は、前記先頭スロットに前記Additional DMRSがマッピングされる場合、前記第2スロット以降のスロットにおいて、前記Additional DMRSを前記先頭スロットと同一の位置にマッピングすることを規定する、
請求項1に記載のユーザ端末。 - スケジューリング情報を含む下りリンク信号を受信する受信部と、
前記下りリンク信号から前記スケジューリング情報を分離する制御部と、
前記スケジューリング情報に基づいて、上りリンク信号に制御チャネル、Front-loaded DMRS(Demodulation Reference Signal)およびAdditional DMRSをマッピングするマッピング部と、
前記上りリンク信号を、複数のスロットをバンドリングして送信する送信部と、
を具備し、
前記マッピング部は、
先頭スロットにおいて、チャネル品質に応じて、前記Additional DMRSをマッピングし、
第2スロット以降において、前記Additional DMRSのマッピングに関する規則に基づいて、前記Additional DMRSのマッピングの有無およびマッピング位置を選択する、
ユーザ端末。 - 前記規則は、前記先頭スロットに前記Additional DMRSがマッピングされる場合、前記第2スロット以降のスロットにおいて、前記Additional DMRSを前記先頭スロットと同一の位置にマッピングすることを規定する、
請求項3に記載のユーザ端末。 - 複数のスロットがバンドリングされ、制御チャネル、Front-loaded DMRS(Demodulation Reference Signal)およびAdditional DMRSを含む下りリンク信号を受信し、
前記下りリンク信号から前記制御チャネル、前記Front-loaded DMRSおよび前記Additional DMRSを分離し、
前記Front-loaded DMRSおよび前記Additional DMRSを用いてチャネル推定値を算出する、
無線通信方法であって、
先頭スロットにおいて、チャネル品質に応じて、前記Additional DMRSがマッピングされ、
第2スロット以降において、前記Additional DMRSのマッピングに関する規則に基づいて、前記Additional DMRSのマッピングの有無あるいはマッピング位置が選択され、
前記第2スロット以降において、前記規則に基づいて前記Additional DMRSのマッピングの有無およびマッピング位置を特定する、
無線通信方法。 - 複数のスロットがバンドリングされ、制御チャネル、Front-loaded DMRS(Demodulation Reference Signal)およびAdditional DMRSを含む下りリンク信号を受信し、
前記下りリンク信号から前記制御チャネル、前記Front-loaded DMRSおよび前記Additional DMRSを分離し、
前記Front-loaded DMRSおよび前記Additional DMRSを用いてチャネル推定値を算出する、
無線通信方法であって、
先頭スロットにおいて、チャネル品質に応じて、前記Additional DMRSをマッピングし、
第2スロット以降において、前記Additional DMRSのマッピングに関する規則に基づいて、前記Additional DMRSのマッピングの有無およびマッピング位置を選択する、
無線通信方法。
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EP22200270.1A EP4135278A1 (en) | 2017-06-15 | 2017-06-15 | Front-loaded and additional dmrs |
EP17914035.5A EP3641255B1 (en) | 2017-06-15 | 2017-06-15 | User terminal and wireless communication method |
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