WO2017119135A1 - 通信システム、通信方法および基地局 - Google Patents
通信システム、通信方法および基地局 Download PDFInfo
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- WO2017119135A1 WO2017119135A1 PCT/JP2016/050574 JP2016050574W WO2017119135A1 WO 2017119135 A1 WO2017119135 A1 WO 2017119135A1 JP 2016050574 W JP2016050574 W JP 2016050574W WO 2017119135 A1 WO2017119135 A1 WO 2017119135A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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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
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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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
Definitions
- the present invention relates to a communication system, a communication method, and a base station.
- LTE Long Term Evolution
- 3G third generation mobile communication system
- LTE-Advanced corresponding to fourth generation mobile communication system LTE-Advanced corresponding to fourth generation mobile communication system
- 5G fifth generation mobile communication system
- LTE is an abbreviation for Long Term Evolution.
- OFDM Orthogonal Frequency Division Multiplexing
- an object of the present invention is to provide a communication system, a communication method, and a base station that can frequency multiplex a plurality of communications having different delay amounts.
- a first period and a second period different from the first period are set for each predetermined period, and the base station and the first terminal And a second terminal different from the first terminal, wherein the first terminal performs uplink or downlink radio with the base station in the first period for each predetermined period.
- the base station performs radio transmission of a link in the opposite direction to the first period, and the second terminal transmits the base station in the first period at the predetermined period.
- a communication system, a communication method, and a base station that perform wireless transmission of a link in the same direction as the first terminal and do not perform wireless transmission with the base station in the second period are proposed.
- FIG. 1 is a diagram illustrating an example of a communication system according to the first embodiment.
- FIG. 2 is a diagram illustrating an example of scheduling in the communication system according to the first embodiment.
- FIG. 3 is a diagram illustrating another example of scheduling in the communication system according to the first embodiment.
- FIG. 4 is a diagram of an example of the base station according to the first embodiment.
- FIG. 5 is a diagram of an example of a hardware configuration of the base station according to the first embodiment.
- FIG. 6 is a diagram of an example of the terminal according to the first embodiment.
- FIG. 7 is a diagram of an example of a hardware configuration of the terminal according to the first embodiment.
- FIG. 8 is a diagram illustrating an example of scheduling in the communication system according to the second embodiment.
- FIG. 9 is a diagram illustrating another example of scheduling in the communication system according to the second embodiment.
- FIG. 1 is a diagram illustrating an example of a communication system according to the first embodiment.
- the communication system 100 according to the first embodiment includes a base station 110, a first terminal 121, and a second terminal 122.
- DL (Down Link) wireless transmission and UL (Up Link) wireless transmission are performed by TDD (Time Division Duplex: time division multiplexing).
- DL wireless transmission is transmission of a wireless signal from the base station 110 to the first terminal 121 or the second terminal 122.
- UL radio transmission is transmission of a radio signal from the first terminal 121 or the second terminal 122 to the base station 110.
- the base station 110 performs scheduling for assigning radio resources to the DL and UL radio transmissions of the first terminal 121 and the second terminal 122. Then, the base station 110 wirelessly transmits control information indicating the result of scheduling to the first terminal 121 and the second terminal 122, and performs DL and transmission between the first terminal 121 and the second terminal 122 based on the result of scheduling.
- UL wireless transmission is performed.
- Each of the first terminal 121 and the second terminal 122 receives the control information wirelessly transmitted from the base station 110, and performs DL and DL with the base station 110 based on the scheduling result included in the received control information.
- UL wireless transmission is performed.
- FIG. 2 is a diagram illustrating an example of scheduling in the communication system according to the first embodiment.
- the base station 110 according to the first embodiment allocates radio resources having different subcarrier intervals (that is, symbol length) and TTI for each traffic in multi-carrier transmission based on OFDM.
- TTI Transmission Time Interval: transmission time interval
- transmission time interval is, for example, the time from transmission of one data to the transmission of the next data (for example, one transport block).
- the base station 110 according to the first embodiment further assigns radio resources having different numbers of subcarriers and CP (Cyclic Prefix) length for each traffic in OFDM-based multicarrier transmission. Also good.
- the horizontal direction indicates time resources, and the vertical direction indicates frequency resources.
- the UEs # 1 to # 4 are UEs (User Equipment: user terminals) capable of wireless communication with the base station 110 using OFDM signals.
- the first terminal 121 shown in FIG. 1 can be realized by, for example, UE # 1.
- the second terminal 122 shown in FIG. 1 can be realized by UEs # 2 to # 4, for example.
- System band 210 is a frequency band that base station 110 can allocate to radio transmissions between UEs # 1 to # 4.
- a hatched line 201 indicates a radio resource allocated to the DL by the base station 110.
- a hatched line 202 indicates radio resources allocated to the UL by the base station 110.
- the base station 110 assigns frequency bands 211 to 214 to the traffic of the UEs # 1 to # 4, respectively.
- the traffic of UE # 1 is traffic for which feedback with low delay with respect to transmitted data is preferentially required as compared with the traffic of UE # 2 to # 4.
- traffic of traffic include traffic of applications such as AR (Augmented Reality) and games.
- the traffic of UEs # 2 to # 4 is traffic for which wide coverage and low power consumption are preferentially required compared to the traffic of UE # 1. Examples of such traffic include transmission / reception of sensing data in a sensor network.
- the OFDM signal has a shorter symbol length as the subcarrier interval is longer.
- the subcarrier interval of UE # 1> the subcarrier interval of UE # 2> the subcarrier interval of UE # 3 the subcarrier interval of UE # 4
- the symbol length of UE # 1 ⁇ The symbol length of UE # 2 ⁇ the symbol length of UE # 3 the symbol length of UE # 4.
- the base station 110 applies a self-contained subframe to the traffic of the UE # 1 for which low-delay feedback with respect to the transmitted data is preferentially required.
- the self-contained subframe is a technique for assigning both DL and UL to one subframe.
- the TTI from when the UE # 1 transmits data to the base station 110 by DL until the base station 110 transmits a response signal (ACK or NACK) to the data to the UE # 1 by UL is short.
- ACK or NACK response signal
- the base station 110 sets a relatively short symbol length for the traffic of UE # 1 for which low-delay feedback with respect to transmitted data is preferentially required. Thereby, in the traffic of UE # 1, encoding and decoding can be performed at short time intervals, and the amount of delay can be reduced.
- DL is assigned to the first 12 symbols
- guard time is assigned to the next 1 symbol
- the remaining 1 symbol is assigned.
- the guard time is a protection period set between DL and UL.
- UL is assigned to the first 12 symbols in the subframe 224
- DL is assigned to the remaining 2 symbols.
- the base station 110 uses a narrowband and long symbol length signal for each traffic of UEs # 2 to # 4 where wide coverage and low power consumption are preferentially required, and does not apply self-contained subframes.
- Set a long TTI length That is, only one of DL and UL is allocated to UEs # 2 to # 4 in one subframe.
- a muting period is set in the period in which the UL is allocated to the UE # 1 in the subframes 221 to 223.
- the muting period is a period during which no radio signal is transmitted / received.
- a muting period is set for UEs # 2 to # 4 in a period in which a DL is assigned to UE # 1 in subframe 224.
- DL is assigned to the first three symbols for each of subframes 221 to 223, and muting is assigned to the remaining period.
- UL is assigned to the first three symbols of subframe 224, and muting is assigned to the remaining period.
- This muting period can be set shorter than the symbol length of the OFDM signal used by UE # 2.
- DL is assigned to the first symbol for UE # 3 and # 4, and muting is assigned to the remaining period.
- UL is assigned to the first symbol of subframe 224, and muting is assigned to the remaining period.
- first periods 231 to 234 and second periods 241 to 244 are set in the subframes 221 to 224, respectively.
- Each of the first periods 231 to 234 is a period in which the UEs # 1 to # 4 (the first terminal 121 and the second terminal 122) perform radio transmission of a link in the same direction of DL and UL.
- the UEs # 1 to # 4 perform DL radio transmission.
- the UEs # 1 to # 4 all perform UL radio transmission.
- the second periods 241 to 244 are periods in which UE # 1 (first terminal 121) performs wireless transmission of links in the opposite direction to the second periods 241 to 244, respectively. For example, in the second periods 241 to 243, UE # 1 performs UL radio transmission. In the second period 244, UE # 1 performs DL radio transmission.
- the UEs # 2 to # 4 are in a muting state in which no wireless transmission is performed with the base station 110 in the second periods 241 to 244.
- the UEs # 2 to # 4 do not perform any UL or DL radio transmission with the base station 110 in the second periods 241 to 243 in which the UE # 1 performs UL radio transmission.
- the UEs # 2 to # 4 do not perform any UL or DL radio transmission with the base station 110 in the second period 244 in which the UE # 1 performs DL radio transmission.
- a guard time is set for UE # 1, but UE # 2 to # 4 perform radio transmission with base station 110 even during the guard time period of UE # 1. There will be no muting state.
- a low sidelobe modulation scheme such as FBMC or F-OFDM that separates the OFDM signals of the UEs # 1 to # 4 by filtering may be used.
- FBMC is an abbreviation for Filter Bank Multi-Carrier.
- F-OFDM is an abbreviation for Filtered-OFDM.
- UE # 1 (first terminal 121) performs UL or DL radio transmission with the base station 110 in the first period 231 to 234 for each subframe (predetermined period). Further, UE # 1 performs radio transmission of links in the opposite direction to the first periods 231 to 234 with the base station 110 in the second periods 241 to 244, respectively. For example, the UE # 1 performs DL radio transmission in the first period 231 and performs UL radio transmission in the opposite direction to the DL in the second period 241.
- the UEs # 2 to # 4 (second terminals 122) perform radio transmission of links in the same direction as the UE # 1 with the base station 110 in the first periods 231 to 234 for each subframe. No wireless transmission is performed with the base station 110 in the two periods 241 to 244.
- the UEs # 2 to # 4 perform DL radio transmission in the same direction as the UE # 1 in the first period 231 and do not perform DL radio transmission or UL radio transmission in the second period 241.
- the communication of UE # 1 that performs UL and DL radio transmission for each subframe has a lower delay than the communication of UE # 2 to # 4 that performs one of UL and DL radio transmission for each subframe. .
- the TTI of UE # 1 is 1 subframe
- the TTIs of UE # 2 to # 4 are 4 subframes.
- the lengths of the second periods 241 to 244 are the OFDM lengths of the UEs # 2 to # 4. It becomes possible to make it shorter than the symbol length of the signal. As a result, the DL period and the UL period can be set in units shorter than the symbol length of the OFDM signals of UEs # 2 to # 4. For this reason, when a plurality of traffics having different symbol lengths are frequency-multiplexed, the degree of freedom of scheduling by the base station 110 is increased, and the utilization efficiency of radio resources can be improved.
- UE # 1 increases radio resources for receiving data in DL, and UE # 1 transmits a response signal for data in UL.
- Wireless resources can be reduced.
- radio resources for UE # 1 to transmit data in UL can be increased, and radio resources for UE # 1 to receive a response signal to data in DL can be reduced.
- the signal of each communication can be separated on the receiving side.
- the base station 110 determines a frame configuration as shown in FIG. 2 in scheduling, for example.
- the frame configuration includes the length of each of the first periods 231 to 234 and the second periods 241 to 244 (division ratio of one subframe).
- the base station 110 is shown in FIG. 2 in the case where each type of traffic in the base station 110 is mixed with traffic of a type that requires low delay and traffic that requires wide coverage and low power consumption. Select a frame structure that looks like this.
- the traffic type can be determined based on, for example, the device type of the UE corresponding to each traffic, the communication request from the UE for each traffic, or the like. Further, the base station 110 determines the subcarrier interval, the number of subcarriers, the TTI, the CP length, and the like set for each traffic according to the transmission rate required for each traffic.
- FIG. 3 is a diagram illustrating another example of scheduling in the communication system according to the first embodiment. 3, parts that are the same as the parts shown in FIG. 2 are given the same reference numerals, and explanation thereof is omitted.
- the base station 110 may assign at least one of the frequency bands 212 to 214 to the UE # 1 in addition to the frequency band 211 for at least one of the second periods 241 to 244. Good.
- the base station 110 may assign the frequency bands 212 to 214 in the second periods 241 to 244 that are not used by the UE # 2 to UE # 4 to the UE # 1.
- the base station 110 allocates frequency bands 211 to 214, 311 to the UE # 1 for the second period 242.
- the frequency band 311 is allocated to UE # 1 in addition to the frequency bands 211 to 214 because the subcarrier interval (12) of UE # 1 is not reached only by the frequency bands 211 to 214.
- UE # 1 performs UL radio transmission using the frequency bands 211 to 214, 311 in the second period 242 based on the result of scheduling by the base station 110.
- UE # 1 (first terminal 121) transmits frequency band 211 (first frequency band) and frequency bands 212 to 214 in at least one of second periods 241 to 244 for each subframe.
- Wireless transmission may be performed by (second frequency band).
- FIG. 4 is a diagram of an example of the base station according to the first embodiment.
- the base station 110 according to the first embodiment includes an antenna 401, a switch 402 (SW), a radio processing unit 403, a control channel demodulation / decoding unit 404, a data channel demodulation / decoding unit, A decoding unit 405 and a packet reproduction unit 406 are provided.
- the base station 110 includes a MAC control unit 407, a radio resource control unit 408, a control channel coding / modulation unit 409, a packet generation unit 410, a data channel coding / modulation unit 411, a multiplexing unit 412, And a wireless processing unit 413.
- the antenna 401, the switch 402, and the wireless processing units 403 and 413 are communication units that can perform wireless transmission between the first terminal 121 and the second terminal 122 illustrated in FIG.
- the communication unit includes a control channel demodulation / decoding unit 404, a data channel demodulation / decoding unit 405, a packet reproduction unit 406, a control channel coding / modulation unit 409, a packet generation unit 410, a data channel coding / modulation unit 411, and Multiplexer 412 may be included.
- the antenna 401 receives a signal wirelessly transmitted from another communication device (for example, the first terminal 121 or the second terminal 122) and outputs the signal to the switch 402.
- the antenna 401 wirelessly transmits a signal output from the switch 402 to another communication device (for example, the first terminal 121 or the second terminal 122).
- the switch 402 is a switch for switching between transmission and reception in the base station 110.
- the switch 402 outputs a signal output from the antenna 401 to the wireless processing unit 403.
- the switch 402 outputs the signal output from the wireless processing unit 413 to the antenna 401.
- the wireless processing unit 403 performs RF reception processing of the signal output from the switch 402.
- the RF reception processing by the wireless processing unit 403 includes, for example, amplification, frequency conversion from an RF (Radio Frequency) band to a baseband band, conversion from an analog signal to a digital signal, and the like.
- Radio processing section 403 outputs the signal subjected to RF reception processing to control channel demodulation / decoding section 404 and data channel demodulation / decoding section 405.
- Control channel demodulation / decoding section 404, data channel demodulation / decoding section 405, and packet reproduction section 406 are set, for example, for each terminal of the communication destination of base station 110.
- the base station 110 performs wireless communication with three terminals. Therefore, three control channel demodulation / decoding sections 404, three data channel demodulation / decoding sections 405 and three packet reproduction sections 406 are set according to the number of terminals.
- the control channel demodulation / decoding unit 404 demodulates and decodes the control channel included in the signal output from the wireless processing unit 403.
- the control channel that the control channel demodulation / decoding unit 404 demodulates and decodes is, for example, a PUCCH (Physical Uplink Control Channel: physical uplink control channel).
- Control channel demodulation / decoding section 404 outputs each of the L1 and L2 control information (L1 / L2 control information) obtained by demodulation and decoding to data channel demodulation / decoding section 405 and packet reproduction section 406.
- the data channel demodulation / decoding unit 405 demodulates and decodes the data channel included in the signal output from the wireless processing unit 403.
- the data channel that the data channel demodulation / decoding unit 405 demodulates and decodes is, for example, PUSCH (Physical Uplink Shared Channel: physical uplink shared channel).
- Data channel demodulation / decoding section 405 outputs data obtained by demodulation and decoding to packet reproduction section 406. Further, the data channel demodulation / decoding unit 405 performs demodulation and decoding of the data channel according to control from the MAC control unit 407 and the radio resource control unit 408.
- the packet reproduction unit 406 reproduces a packet from the data output from the data channel demodulation / decoding unit 405 based on the control information output from the control channel demodulation / decoding unit 404. Then, the packet reproduction unit 406 outputs the reproduced packet as user data. Further, the packet reproduction unit 406 performs packet reproduction in accordance with control from the MAC control unit 407 and the radio resource control unit 408.
- the MAC control unit 407 performs the wireless transmission with the communication unit including the antenna 401, the switch 402, the wireless processing units 403 and 413, or the first terminal 121 and the second terminal so as not to perform the wireless transmission.
- 122 is a control unit for controlling 122.
- the MAC control unit 407 controls a MAC (Media Access Control) layer in communication of the base station 110.
- the control of the MAC layer includes scheduling for allocating radio resources for radio communication between the base station 110 and terminals (for example, the first terminal 121 and the second terminal 122).
- the scheduling by the base station 110 shown in FIGS. 2 and 3 can be performed by the MAC control unit 407, for example.
- the MAC control unit 407 controls demodulation and decoding in the data channel demodulation / decoding unit 405 and packet reproduction in the packet reproduction unit 406 based on the UL scheduling result. Further, the MAC control unit 407 performs coding and modulation in the control channel coding / modulation unit 409 and the data channel coding / modulation unit 411, and packet generation in the packet generation unit 410 based on the DL scheduling result. , Control. Further, the MAC control unit 407 outputs L1 and L2 control information indicating the DL and UL scheduling results to the control channel coding / modulation unit 409.
- the radio resource control unit 408 controls an RRC (Radio Resource Control: radio resource control) layer in the communication of the base station 110.
- the radio resource control unit 408 controls, for example, demodulation and decoding in the data channel demodulation / decoding unit 405 and packet reproduction in the packet reproduction unit 406. Further, the radio resource control unit 408 controls packet generation in the packet generation unit 410 and encoding and modulation in the data channel encoding / modulation unit 411. Moreover, the radio
- Control channel coding / modulation section 409, packet generation section 410, and data channel coding / modulation section 411 are set for each terminal of the communication destination of base station 110, for example.
- the base station 110 performs wireless communication with three terminals. Therefore, three control channel encoding / modulation sections 409, packet generation sections 410, and data channel encoding / modulation sections 411 are set according to the number of terminals.
- the control channel encoding / modulation unit 409 encodes and modulates the control channel including the control information output from the MAC control unit 407.
- the control channel on which the control channel coding / modulation unit 409 performs coding and modulation is a PDCCH (Physical Downlink Control Channel: physical downlink control channel).
- Control channel coding / modulation section 409 outputs the control channel obtained by coding and modulation to multiplexing section 412. Further, the control channel encoding / modulation unit 409 encodes and modulates the control channel according to the control from the MAC control unit 407.
- the packet generation unit 410 generates a packet from DL user data to be transmitted by the base station 110, and outputs the generated packet to the data channel encoding / modulation unit 411. Further, the packet generation unit 410 generates a packet in accordance with control from the MAC control unit 407 and the radio resource control unit 408.
- the data channel coding / modulation unit 411 performs coding and modulation of the data channel including the packet output from the packet generation unit 410.
- the data channel that the data channel encoding / modulating unit 411 performs encoding and modulation is, for example, PDSCH (Physical Downlink Shared Channel: physical downlink shared channel).
- the data channel encoding / modulation unit 411 outputs the data channel obtained by encoding and modulation to the multiplexing unit 412.
- the data channel coding / modulation unit 411 performs coding and modulation of the data channel according to control from the MAC control unit 407 and the radio resource control unit 408.
- the multiplexing unit 412 multiplexes the control channel output from the control channel encoding / modulating unit 409 and the data channel output from the data channel encoding / modulating unit 411. Then, multiplexing section 412 outputs a signal obtained by multiplexing to radio processing section 413.
- the wireless processing unit 413 performs RF transmission processing on the signal output from the multiplexing unit 412.
- the RF transmission processing by the wireless processing unit 413 includes, for example, conversion from a digital signal to an analog signal, frequency conversion from a baseband to an RF band, amplification, and the like.
- the wireless processing unit 413 outputs the signal subjected to the RF transmission process to the switch 402.
- FIG. 5 is a diagram of an example of a hardware configuration of the base station according to the first embodiment.
- the base station 110 shown in FIG. 4 can be realized by, for example, the communication apparatus 500 shown in FIG.
- the communication device 500 includes a CPU 501, a memory 502, a wireless communication interface 503, and a wired communication interface 504.
- the CPU 501, the memory 502, the wireless communication interface 503, and the wired communication interface 504 are connected by a bus 509.
- a CPU 501 Central Processing Unit controls the entire communication device 500.
- the memory 502 includes, for example, a main memory and an auxiliary memory.
- the main memory is, for example, a RAM (Random Access Memory).
- the main memory is used as a work area for the CPU 501.
- the auxiliary memory is, for example, a nonvolatile memory such as a magnetic disk, an optical disk, or a flash memory.
- Various programs for operating the communication device 500 are stored in the auxiliary memory. The program stored in the auxiliary memory is loaded into the main memory and executed by the CPU 501.
- the wireless communication interface 503 is a communication interface that communicates with the outside of the communication device 500 (for example, the first terminal 121 and the second terminal 122) wirelessly.
- the wireless communication interface 503 is controlled by the CPU 501.
- the wireless communication interface 503 includes, for example, an ADC (Analog / Digital Converter), a DAC (Digital / Analog Converter: digital / analog converter), and the like.
- the wireless communication interface 503 includes an amplifier, a mixer that performs frequency conversion, and the like.
- the wired communication interface 504 is a communication interface that communicates with the outside of the communication device 500 by wire.
- the wired communication interface 504 is controlled by the CPU 501.
- the communication destination (external) of the wired communication interface 504 is each communication device of the core network to which the base station 110 is connected, for example.
- the control channel coding / modulation unit 409, the packet generation unit 410, the data channel coding / modulation unit 411, and the multiplexing unit 412 illustrated in FIG. 4 can be realized by the CPU 501, for example.
- the user data output from the packet reproduction unit 406 shown in FIG. 4 is transmitted to the core network via the wired communication interface 504.
- control information transmitted from the core network is input to the radio resource control unit 408 illustrated in FIG. 4 via the wired communication interface 504.
- user data transmitted from the core network is input to the packet generation unit 410 illustrated in FIG. 4 via the wired communication interface 504.
- FIG. 6 is a diagram of an example of the terminal according to the first embodiment.
- the first terminal 121 and the second terminal 122 according to the first embodiment can be realized by, for example, the terminal 600 shown in FIG.
- the terminal 600 includes an antenna 601, a switch 602, a radio processing unit 603, a control channel demodulation / decoding unit 604, a data channel demodulation / decoding unit 605, and a packet reproduction unit 606.
- the terminal 600 also includes a MAC control unit 607, a radio resource control unit 608, a control channel encoding / modulation unit 609, a packet generation unit 610, a data channel encoding / modulation unit 611, a multiplexing unit 612, A wireless processing unit 613.
- the antenna 601 receives a signal wirelessly transmitted from another communication device (for example, the base station 110) and outputs the signal to the switch 602. In addition, the antenna 601 wirelessly transmits the signal output from the switch 602 to another communication device (for example, the base station 110).
- another communication device for example, the base station 110
- the antenna 601 wirelessly transmits the signal output from the switch 602 to another communication device (for example, the base station 110).
- Switch 602 is a switch for switching between transmission and reception in terminal 600.
- the switch 602 outputs a signal output from the antenna 601 to the wireless processing unit 603.
- the switch 602 outputs the signal output from the wireless processing unit 613 to the antenna 601.
- the wireless processing unit 603 performs an RF reception process on the signal output from the switch 602.
- the RF reception processing by the wireless processing unit 603 includes, for example, amplification, frequency conversion from the RF band to the baseband, conversion from an analog signal to a digital signal, and the like.
- Radio processing section 603 outputs the signal subjected to RF reception processing to control channel demodulation / decoding section 604 and data channel demodulation / decoding section 605.
- the control channel demodulation / decoding unit 604 performs demodulation and decoding of the control channel included in the signal output from the wireless processing unit 603.
- the control channel that the control channel demodulation / decoding unit 604 demodulates and decodes is a PDCCH as an example.
- the control channel demodulation / decoding unit 604 outputs the L1 and L2 control information (L1 / L2 control information) obtained by demodulation and decoding to the MAC control unit 607.
- the control information output from the control channel demodulation / decoding unit 604 to the MAC control unit 607 includes the results of DL and UL scheduling by the base station 110.
- the data channel demodulation / decoding unit 605 demodulates and decodes the data channel included in the signal output from the wireless processing unit 603.
- the data channel that the data channel demodulation / decoding unit 605 demodulates and decodes is, for example, PDSCH.
- Data channel demodulation / decoding section 605 outputs data obtained by demodulation and decoding to packet reproduction section 606.
- the data channel demodulation / decoding unit 605 performs data channel demodulation and decoding in accordance with control from the MAC control unit 607 and the radio resource control unit 608.
- the packet reproduction unit 606 reproduces a packet from the data output from the data channel demodulation / decoding unit 605. Then, the packet reproducing unit 606 outputs the reproduced packet as user data. Further, the packet reproduction unit 606 performs packet reproduction according to control from the MAC control unit 607 and the radio resource control unit 608.
- the MAC control unit 607 controls the MAC layer in the communication of the terminal 600 based on the control information (for example, the result of scheduling) output from the control channel demodulation / decoding unit 604. For example, the MAC control unit 607 controls demodulation and decoding in the data channel demodulation / decoding unit 605 and packet reproduction in the packet reproduction unit 606 based on a DL scheduling result by the base station 110. The MAC control unit 607 controls encoding and modulation in the control channel encoding / modulation unit 609 and packet generation in the packet generation unit 610 based on the UL scheduling result by the base station 110. Also, the MAC control unit 607 outputs L1 and L2 uplink control information to the control channel coding / modulation unit 609.
- the control information for example, the result of scheduling
- the radio resource control unit 608 controls the RRC layer in the communication of the terminal 600.
- the radio resource control unit 608 controls, for example, demodulation and decoding in the data channel demodulation / decoding unit 605 and packet reproduction in the packet reproduction unit 606.
- Radio resource control section 608 controls packet generation in packet generation section 610 and encoding and modulation in data channel encoding / modulation section 611. Further, the radio resource control unit 608 performs each control based on control information output from, for example, an upper layer (for example, an application processing unit).
- the control channel coding / modulation unit 609 performs coding and modulation of the control channel including the control information output from the MAC control unit 607.
- the control channel that the control channel coding / modulation unit 609 performs coding and modulation is, for example, PUCCH.
- Control channel coding / modulation section 609 outputs the control channel obtained by coding and modulation to multiplexing section 612. Further, the control channel encoding / modulation unit 609 performs encoding and modulation of the control channel according to the control from the MAC control unit 607.
- the packet generation unit 610 generates a packet from UL user data to be transmitted by the terminal 600 and outputs the generated packet to the data channel encoding / modulation unit 611. Further, the packet generation unit 610 generates a packet in accordance with control from the MAC control unit 607 and the radio resource control unit 608.
- the data channel coding / modulation unit 611 performs coding and modulation of the data channel including the packet output from the packet generation unit 610.
- the data channel that the data channel coding / modulation unit 611 performs coding and modulation is PUSCH as an example.
- the data channel coding / modulation unit 611 outputs the data channel obtained by the coding and modulation to the multiplexing unit 612.
- the data channel coding / modulation unit 611 performs coding and modulation according to control from the MAC control unit 607 and the radio resource control unit 608.
- the multiplexing unit 612 multiplexes the control channel output from the control channel encoding / modulation unit 609 and the data channel output from the data channel encoding / modulation unit 611. Then, multiplexing section 612 outputs a signal obtained by multiplexing to radio processing section 613.
- the wireless processing unit 613 performs RF transmission processing on the signal output from the multiplexing unit 612.
- the RF transmission processing by the wireless processing unit 613 includes, for example, conversion from a digital signal to an analog signal, frequency conversion from a baseband to an RF band, amplification, and the like.
- the wireless processing unit 613 outputs the signal subjected to the RF transmission process to the switch 602.
- FIG. 7 is a diagram of an example of a hardware configuration of the terminal according to the first embodiment.
- the terminal 600 shown in FIG. 6 can be realized by, for example, the information processing apparatus 700 shown in FIG.
- the information processing apparatus 700 includes a CPU 701, a memory 702, a user interface 703, and a wireless communication interface 704.
- the CPU 701, the memory 702, the user interface 703, and the wireless communication interface 704 are connected by a bus 709.
- the CPU 701 governs overall control of the information processing apparatus 700.
- the memory 702 includes, for example, a main memory and an auxiliary memory.
- the main memory is, for example, a RAM.
- the main memory is used as a work area for the CPU 701.
- the auxiliary memory is a non-volatile memory such as a magnetic disk or a flash memory.
- Various programs for operating the information processing apparatus 700 are stored in the auxiliary memory.
- the program stored in the auxiliary memory is loaded into the main memory and executed by the CPU 701.
- the user interface 703 includes, for example, an input device that receives an operation input from the user, an output device that outputs information to the user, and the like.
- the input device can be realized by, for example, a key (for example, a keyboard) or a remote controller.
- the output device can be realized by, for example, a display or a speaker. Further, an input device and an output device may be realized by a touch panel or the like.
- the user interface 703 is controlled by the CPU 701.
- the wireless communication interface 704 is a communication interface that performs communication with the outside of the information processing apparatus 700 (for example, the base station 110) wirelessly.
- the wireless communication interface 704 is controlled by the CPU 701.
- the antenna 601, the switch 602, and the wireless processing units 603 and 613 illustrated in FIG. 6 are included in the wireless communication interface 704, for example.
- the control channel coding / modulation unit 609, the packet generation unit 610, the data channel coding / modulation unit 611, and the multiplexing unit 612 illustrated in FIG. 6 can be realized by the CPU 701, for example.
- the user data output from the packet reproduction unit 606 shown in FIG. 6 is processed by an application executed by the CPU 701, for example.
- control information output from an application executed by the CPU 701 is input to the radio resource control unit 608 illustrated in FIG.
- user data output from an application executed by the CPU 701 is input to the packet generation unit 610 illustrated in FIG.
- the first terminal 121 performs UL or DL wireless transmission with the base station 110 in the first period every predetermined period (subframe).
- the first terminal 121 performs wireless transmission of a link in the opposite direction to the first period with the base station 110 in the second period at every predetermined period.
- the second terminal 122 performs radio transmission of a link in the same direction as the first terminal 121 with the base station 110 in the first period at every predetermined period, and with the base station 110 in the second period. Does not perform wireless transmission.
- the communication of the first terminal 121 that performs UL and DL wireless transmission at every predetermined period is more data transmission than the communication of the second terminal 122 that performs one of UL and DL wireless transmission at every predetermined period.
- the response signal for the data can be transmitted in a short cycle. Therefore, the communication of the first terminal 121 has a lower delay than the communication of the second terminal 122. For this reason, it is possible to frequency multiplex communication with a small amount of delay (communication of the first terminal 121) and communication with a large amount of delay (second terminal 122).
- the second terminal 122 performs radio transmission with the base station 110 using an OFDM signal having a second symbol length longer than the first symbol length of the OFDM signal of the first terminal 121.
- communication of the 2nd terminal 122 can be made into communication with a wider coverage than the communication of the 1st terminal 121, and low power consumption. For this reason, it is possible to frequency multiplex communication with small delay (communication of the first terminal 121) and communication with wide coverage and low power consumption (communication of the second terminal 122).
- each length of the second period can be shorter than the symbol length of the OFDM signal of the second terminal 122. become. This increases the degree of freedom of scheduling by the base station 110 when frequency-multiplexing a plurality of communications with different symbol lengths, and can improve the utilization efficiency of radio resources.
- the signal of each communication can be separated on the receiving side.
- FIG. 8 is a diagram illustrating an example of scheduling in the communication system according to the second embodiment.
- DL is assigned to the first 12 symbols for each of subframes 221 to 223, and muting is assigned to the remaining period.
- UL is assigned to the first 12 symbols of subframe 224, and muting is assigned to the remaining period.
- This muting period can be set shorter than the symbol length of the OFDM signal used by UE # 2.
- UE # 1 (first terminal 121) performs UL or DL radio transmission with the base station 110 in the first period 231 to 234 for each subframe (predetermined period). Also, UE # 1 performs radio transmission of links in the opposite direction to the first periods 231 to 234 with the base station 110 in the second periods 241 to 244 for each subframe. Also, UE # 2 (second terminal 122) performs radio transmission of a link in the same direction as UE # 1 with base station 110 in first periods 231 to 234 for each subframe, and in second period 241. ⁇ 244 does not perform wireless transmission with the base station 110.
- the communication of UE # 1 that performs UL and DL radio transmission for each subframe has a lower delay than the communication of UE # 2 that performs one of UL and DL radio transmission for each subframe. For this reason, it is possible to frequency multiplex communication with a small amount of delay (communication of UE # 1) and communication with a large amount of delay (communication of UE # 2).
- the TTI of UE # 1 is 1 subframe
- the TTI of UE # 2 is 4 subframes.
- the UEs # 1 and # 2 Even if the symbol lengths of the OFDM signals of the UEs # 1 and # 2 are the same, for example, by adjusting the number of subcarriers and the number of symbols allocated to the UEs # 1 and # 2, the UEs # 1 and # 2 The communication speed can be changed.
- FIG. 9 is a diagram illustrating another example of scheduling in the communication system according to the second embodiment.
- the base station 110 may assign at least one of the frequency bands 212 to 214 to the UE # 1 in addition to the frequency band 211 for at least one of the second periods 241 to 244. Good.
- DL is assigned to the first 12 symbols for each of subframes 221 to 223, and muting is assigned to the remaining period.
- UL is assigned to the first 12 symbols in the subframe 224, and muting is assigned to the remaining period. This muting period can be set shorter than the symbol length of the OFDM signal used by the UEs # 3 and # 4.
- the base station 110 assigns the frequency bands 211 to 213 to the UE # 1 for the second period 242.
- UE # 1 performs UL radio transmission using the frequency bands 211 to 213 in the second period 242 based on the result of scheduling by the base station 110.
- UE # 1 (first terminal 121) transmits frequency band 211 (first frequency band) and frequency bands 212 to 214 in at least one of second periods 241 to 244 for each subframe.
- Wireless transmission may be performed by (second frequency band).
- the first terminal 121 performs UL or DL wireless transmission with the base station 110 in the first period every predetermined period (subframe).
- the first terminal 121 performs wireless transmission of a link in the opposite direction to the first period with the base station 110 in the second period at every predetermined period.
- the second terminal 122 performs radio transmission of a link in the same direction as the first terminal 121 with the base station 110 in the first period at every predetermined period, and with the base station 110 in the second period. Does not perform wireless transmission.
- the communication of the first terminal 121 that performs UL and DL wireless transmission at every predetermined period is more data transmission than the communication of the second terminal 122 that performs one of UL and DL wireless transmission at every predetermined period.
- the response signal for the data can be transmitted in a short cycle. Therefore, the communication of the first terminal 121 has a lower delay than the communication of the second terminal 122. For this reason, it is possible to frequency multiplex communication with a small amount of delay (communication of the first terminal 121) and communication with a large amount of delay (second terminal 122).
- the OFDM signals of the first terminal 121 and the second terminal 122 can be made orthogonal to each other. For this reason, for example, signals of each communication can be separated on the receiving side without using a low sidelobe modulation scheme such as FBMC or F-OFDM.
- the base station 110 switches between, for example, scheduling with the same symbol length between the UEs illustrated in FIGS. 8 and 9 and scheduling for setting the symbol length for each UE illustrated in FIGS. 2 and 3, for example. You may go.
- a plurality of communications with different delay amounts can be frequency-multiplexed.
- 3GPP has begun studying 5G systems, the introduction of a new radio interface (new RAT) that is not backward compatible with conventional LTE or LTE-Advanced is planned.
- 3GPP is an abbreviation for 3rd Generation Partnership Project.
- RAT is an abbreviation for Radio Access Technology (Radio Access Technology).
- the above-described self-contained subframe technology is premised on application to a TDD system.
- the utilization efficiency (multiplexing efficiency) of the radio resources may be lowered. This is because in TDD, the setting of the boundary between the DL period and the UL period is performed in units of the longest symbol length of the symbol lengths of the respective signals that are frequency multiplexed.
- the first terminal 121 transmits DL and UL for each subframe in a system that performs TDD of DL and UL. Further, the second terminal 122 transmits one of DL and UL simultaneously with the first terminal 121 for each subframe, and does not transmit the other of DL and UL.
- the self-contained subframe technology with a short TTI length and the non-self-contained subframe technology with a long TTI length can be frequency-multiplexed in the same time, thereby improving the utilization efficiency of radio resources. be able to.
- communication is performed using a radio channel (system band) between the base station and two or more terminals.
- system band system band
- communication in which a DL signal and a UL signal are time-multiplexed is performed using different frequencies in a radio channel.
- the communication system 100 in some uplink or downlink signal sections of communication between the base station and a certain terminal, there is no transmission section (muting) in the communication between the base station and another terminal. Is set. As a result, a short TTI self-contained subframe and a long TTI non-self-contained subframe can be frequency-multiplexed within the same time interval, so that the utilization efficiency of radio resources can be improved.
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Abstract
Description
(実施の形態1にかかる通信システム)
図1は、実施の形態1にかかる通信システムの一例を示す図である。図1に示すように、実施の形態1にかかる通信システム100は、基地局110と、第1端末121および第2端末122と、を含む。通信システム100においては、DL(Down Link:下りリンク)の無線伝送と、UL(Up Link:上りリンク)の無線伝送と、がTDD(Time Division Duplex:時分割多重)により行われる。
図2は、実施の形態1にかかる通信システムにおけるスケジューリングの一例を示す図である。実施の形態1にかかる基地局110は、OFDMをベースとしたマルチキャリア伝送において、トラフィックごとに異なるサブキャリア間隔(すなわちシンボル長)およびTTIを有する無線リソースを割り当てる。
図4は、実施の形態1にかかる基地局の一例を示す図である。実施の形態1にかかる基地局110は、たとえば、図4に示すように、アンテナ401と、スイッチ402(SW)と、無線処理部403と、制御チャネル復調・復号部404と、データチャネル復調・復号部405と、パケット再生部406と、を備える。また、基地局110は、MAC制御部407と、無線リソース制御部408と、制御チャネル符号化・変調部409と、パケット生成部410と、データチャネル符号化・変調部411と、多重部412と、無線処理部413と、を備える。
図6は、実施の形態1にかかる端末の一例を示す図である。実施の形態1にかかる第1端末121および第2端末122は、たとえば図6に示す端末600により実現することができる。端末600は、アンテナ601と、スイッチ602と、無線処理部603と、制御チャネル復調・復号部604と、データチャネル復調・復号部605と、パケット再生部606と、を備える。また、端末600は、MAC制御部607と、無線リソース制御部608と、制御チャネル符号化・変調部609と、パケット生成部610と、データチャネル符号化・変調部611と、多重部612と、無線処理部613と、を備える。
実施の形態2について、実施の形態1と異なる部分について説明する。実施の形態1においては、第1端末121および第2端末122の各OFDM信号のシンボル長が異なる場合について説明したが、実施の形態2においては、第1端末121および第2端末122の各OFDM信号のシンボル長を同一とする場合について説明する。
図8は、実施の形態2にかかる通信システムにおけるスケジューリングの一例を示す図である。図8において、図2に示した部分と同様の部分については同一の符号を付して説明を省略する。図8に示す例では、UE#1には、サブキャリア間隔=12、サブキャリア数=4の周波数帯域211が割り当てられている。UE#2には、サブキャリア間隔=12、サブキャリア数=1の周波数帯域212が割り当てられている。
110 基地局
121 第1端末
122 第2端末
201,202 斜線
210 システム帯域
211~214,311 周波数帯域
221~224 サブフレーム
231~234 第1期間
241~244 第2期間
401,601 アンテナ
402,602 スイッチ
403,413,603,613 無線処理部
404,604 制御チャネル復調・復号部
405,605 データチャネル復調・復号部
406,606 パケット再生部
407,607 MAC制御部
408,608 無線リソース制御部
409,609 制御チャネル符号化・変調部
410,610 パケット生成部
411,611 データチャネル符号化・変調部
412,612 多重部
500 通信装置
501,701 CPU
502,702 メモリ
503,704 無線通信インタフェース
504 有線通信インタフェース
509,709 バス
600 端末
700 情報処理装置
703 ユーザインタフェース
Claims (8)
- 所定周期ごとに第1期間および前記第1期間と異なる第2期間が設定される通信システムであって、
基地局と、
前記所定周期ごとに、前記第1期間において前記基地局との間で上りリンクまたは下りリンクの無線伝送を行い前記第2期間において前記基地局との間で前記第1期間と反対方向のリンクの無線伝送を行う第1端末と、
前記第1端末と異なる第2端末であって、前記所定周期ごとに、前記第1期間において前記基地局との間で前記第1端末と同じ方向のリンクの無線伝送を行い前記第2期間において前記基地局との間で無線伝送を行わない第2端末と、
を含むことを特徴とする通信システム。 - 前記第1端末は、第1周波数帯域により前記基地局との間で無線伝送を行い、
前記第2端末は、前記第1周波数帯域と異なる第2周波数帯域により前記基地局との間で無線伝送を行う、
ことを特徴とする請求項1に記載の通信システム。 - 前記第1端末は、第1シンボル長の直交周波数分割多重信号により前記基地局との間で無線伝送を行い、
前記第2端末は、前記第1シンボル長より長い第2シンボル長の直交周波数分割多重信号により前記基地局との間で無線伝送を行う、
ことを特徴とする請求項1または2に記載の通信システム。 - 前記第2期間の長さは前記第2シンボル長より短いことを特徴とする請求項3に記載の通信システム。
- 前記第1端末および前記第2端末は、同一のシンボル長の直交周波数分割多重信号により前記基地局との間で無線伝送を行うことを特徴とする請求項1または2に記載の通信システム。
- 前記第1期間において、前記第1端末は第1周波数帯域により前記基地局との間で無線伝送を行い前記第2端末は前記第1周波数帯域と異なる第2周波数帯域により前記基地局との間で無線伝送を行い、
前記所定周期ごとの前記第2期間の少なくともいずれかの第2期間において、前記第1端末は前記第1周波数帯域および前記第2周波数帯域により前記基地局との間で無線伝送を行う、
ことを特徴とする請求項1~5のいずれか一つに記載の通信システム。 - 所定周期ごとに第1期間および前記第1期間と異なる第2期間が設定され、基地局と、第1端末と、前記第1端末と異なる第2端末と、を含む通信システムにおける通信方法であって、
前記第1端末が、前記所定周期ごとに、前記第1期間において前記基地局との間で上りリンクまたは下りリンクの無線伝送を行い前記第2期間において前記基地局との間で前記第1期間と反対方向のリンクの無線伝送を行い、
前記第2端末が、前記所定周期ごとに、前記第1期間において前記基地局との間で前記第1端末と同じ方向のリンクの無線伝送を行い、前記第2期間において前記基地局との間で無線伝送を行わない、
ことを特徴とする通信方法。 - 所定周期ごとに第1期間および前記第1期間と異なる第2期間が設定される通信システムの基地局であって、
第1端末および前記第1端末と異なる第2端末と間で無線伝送が可能な通信部と、
前記所定周期ごとに、前記第1期間において前記通信部との間で上りリンクまたは下りリンクの無線伝送を行い前記第2期間において前記通信部との間で前記第1期間と反対方向のリンクの無線伝送を行うように前記第1端末を制御し、前記所定周期ごとに、前記第1期間において前記通信部との間で前記第1端末と同じ方向のリンクの無線伝送を行い前記第2期間において前記通信部との間で無線伝送を行わないように前記第2端末を制御する制御部と、
を備えることを特徴とする基地局。
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Also Published As
Publication number | Publication date |
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JP6544443B2 (ja) | 2019-07-17 |
EP3402282A1 (en) | 2018-11-14 |
US20180310326A1 (en) | 2018-10-25 |
JPWO2017119135A1 (ja) | 2018-09-20 |
CN108432327B (zh) | 2021-06-29 |
EP3402282B1 (en) | 2020-11-18 |
US10602531B2 (en) | 2020-03-24 |
EP3402282A4 (en) | 2019-01-09 |
CN108432327A (zh) | 2018-08-21 |
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