WO2010140347A1 - 無線通信システム、無線通信方法、基地局装置、および端末局装置 - Google Patents
無線通信システム、無線通信方法、基地局装置、および端末局装置 Download PDFInfo
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- WO2010140347A1 WO2010140347A1 PCT/JP2010/003659 JP2010003659W WO2010140347A1 WO 2010140347 A1 WO2010140347 A1 WO 2010140347A1 JP 2010003659 W JP2010003659 W JP 2010003659W WO 2010140347 A1 WO2010140347 A1 WO 2010140347A1
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- terminal station
- station apparatus
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- component carrier
- carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—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
- 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
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a radio communication system, a radio communication method, a base station apparatus, and a terminal station apparatus.
- LTE-A Long Term Evolution-Advanced
- LTE-A is being studied as the next communication method of LTE (Long Term Evolution). ing.
- LTE-A is required to realize higher-speed communication than LTE, and is required to support a wider band (a band up to 100 MHz exceeding the 20 MHz band of LTE) than LTE.
- a plurality of carriers with a bandwidth of up to 20 MHz are collected together.
- Carrier aggregation that secures a maximum bandwidth of 100 MHz by communication and realizes high-speed and large-capacity communication was proposed and agreed at the 3GPP RAN1 # 53b meeting.
- a carrier up to 20 MHz is called a component carrier (CC).
- CC component carrier
- control channel arrangement 1 Physical Control Format Indicator Indicator Channel
- PHICH Physical Hybrid Repeat Request Request Indicator
- PDCCH Physical Downlink Control Channel
- control channel arrangement 2 a control channel of one or more (partial) component carriers
- control channel arrangement 2 The method of arranging all the control information (also referred to as control information) of other component carriers together (hereinafter referred to as “control channel arrangement 2”). ”)).
- control channel arrangement 2 it is necessary to construct a new DCI (Downlink Control Information) format by abandoning the compatibility with LTE to some extent.
- the terminal station apparatus must monitor and receive all the component carriers used for carrier aggregation (for the terminal apparatus) notified from the base station apparatus at the same time. is there.
- the control channel arrangement 1 the control information and the data information exist in pairs corresponding to each component carrier, and unless there is a special instruction from the base station apparatus, carrier aggregation notified from the base station apparatus All the component carriers used for the transmission must be received simultaneously. However, it is possible to reduce the number of component carriers that can be received by adding some restrictions to the component carriers used by the terminal device.
- the control channel arrangement 2 for example, if only the component carrier to which the control information is transmitted is received, the data information is temporarily arranged on a component carrier other than the component carrier to which the control information is transmitted. In this case, it is impossible to acquire data information in the subframe. For this reason, even in the control channel arrangement 2, all component carriers used for carrier aggregation notified from the base station apparatus must be received.
- Receiving all the component carriers used for carrier aggregation notified from the base station apparatus simultaneously means that the RF (Radio Frequency) front end part of the terminal station apparatus is operated corresponding to the band of the component carrier. Since it is necessary, the power consumption of the terminal station apparatus increases. It is obvious that waste of power consumption occurs particularly when the amount of communication data is small or when data is not received.
- the control channel arrangement 2 is expected to reduce the amount of ACK / NACK feedback in HARQ (Hybrid Automatic Repeat Request).
- Non-Patent Document 1 in consideration of the effect of suppressing power consumption, a technique for notifying component carriers to be aggregated by semi-dynamic triggering PDCCH (Semi-Dynamic triggering PDCCH) is proposed.
- the semi-dynamic triggering PDCCH includes a set of active component carriers, which are component carriers that are valid after k subframes from a subframe transmitted by the semi-dynamic triggering PDCCH, a valid period of active component carriers, and each active component carrier.
- CCE Control Channel Element
- the LTE-A terminal station apparatus receives the semi-dynamic triggering PDCCH, and only needs to monitor the activated component carrier set until the valid period ends, thereby suppressing power consumption.
- Non-Patent Document 2 in addition to the definition of the anchor component carrier, the definition of the active component carrier for each terminal station apparatus is introduced.
- a component carrier that transmits control information such as downlink scheduling information is defined as an anchor component carrier
- an active component carrier is defined as a component carrier that maintains a receivable state.
- the active component carrier is signaled semi-statically from a higher layer by signaling or a special downlink control channel (PDCCH). Specifically, the future data amount is predicted from the data amount communicated in advance, the active component carrier is determined for aggregation communication based on the predicted data amount, and the determined component carrier can be communicated (active Ready).
- PDCCH downlink control channel
- Non-Patent Document 3 shows that it is desired to communicate with one component carrier as much as possible because power consumption increases when communication is performed with a plurality of component carriers.
- the carrier aggregation it is necessary to simultaneously monitor the component carrier used for carrier aggregation (for the terminal device) notified from the base station apparatus. Since it is necessary to operate according to the band, the power consumption of the terminal station apparatus increases.
- a carrier by a plurality of component carriers from the standby state.
- the component carrier used for carrier aggregation communication is selected by the base station apparatus, the terminal station apparatus, or both.
- the radio quality (reception quality) of component carriers other than the anchor carrier is grasped.
- carrier aggregation communication is started, a component carrier having poor radio quality is selected as a component carrier to be used for aggregation communication, and the communication efficiency is reduced with respect to the used bandwidth. There is a problem that there is.
- Non-Patent Document 1 does not describe an opinion on a method for determining a component carrier to be activated, and there is a possibility that a component carrier having poor radio quality may be used for aggregation communication.
- Non-Patent Document 2 as in Non-Patent Document 1, there is no opinion on how to determine a component carrier to be activated, and there is also a description of how to synchronize with a component carrier other than an anchor carrier. Absent. For this reason, there is a possibility that a component carrier with poor radio quality may be used for carrier aggregation communication.
- the present invention has been made in view of such circumstances.
- the purpose of the present invention is to suppress an increase in power consumption and at the same time to use a carrier used for communication even when carrier aggregation for performing communication by collecting a plurality of carriers is applied. It is an object to provide a wireless communication system, a wireless communication method, a base station apparatus, and a terminal station apparatus that can suppress a decrease in communication efficiency when changing the terminal.
- a radio communication system of the present invention includes a terminal station apparatus and a base station apparatus that transmits data to the terminal station apparatus using a plurality of component carriers that are communication frequency bands for performing radio communication.
- the base station apparatus starts transmission of data to the terminal station apparatus or changes the component carrier used for data transmission to the terminal station apparatus, a plurality of the components Based on the radio quality of each carrier, the component carrier that transmits the data is determined, and the data is transmitted using the frequency band determining unit that notifies the terminal station device, and the component carrier determined by the frequency band determining unit.
- the terminal station device is notified by the frequency band determining unit of the base station device.
- the wireless communication system of the present invention is the above-described wireless communication system, wherein the base station apparatus starts transmission of data to the terminal station apparatus or to the terminal station apparatus.
- a quality measurement instructing unit that instructs the terminal station apparatus to measure radio quality at the plurality of component carriers when changing the component carrier used for data transmission, and the terminal station apparatus includes: A quality measuring unit that measures radio quality at a plurality of component carriers instructed by a quality measurement instructing unit and transmits the radio quality to the base station device, and the frequency band determining unit includes the data The component reported from the terminal station device as a response to the instruction by the quality measurement instruction unit It performed based on the radio quality in Yaria each.
- wireless communications system of this invention is the above-mentioned radio
- the said frequency band determination part transmits the said data based on the requirements regarding the transmission of the said data.
- the component carrier to be determined is determined.
- wireless communications system of this invention is the above-mentioned radio
- the requirements regarding the transmission of the data include the data amount of the data, and the quality of service of the data.
- wireless communications system of this invention is the above-mentioned radio
- wireless communications system of this invention is the above-mentioned radio
- the quality measurement part of the said terminal station apparatus is periodic about the anchor carrier which is one of the said component carriers.
- the data transmission is started using only the anchor carrier.
- wireless communications system of this invention is the above-mentioned radio
- indication part uses multiple component carriers for the transmission of the said data based on the requirements regarding the transmission of the said data If it is determined that a plurality of component carriers are not used, the transmission unit does not instruct measurement of radio quality to the terminal station apparatus, and the transmission unit includes a plurality of component carriers for transmission of the data. When it is determined not to be used, the data is transmitted using the anchor carrier.
- the wireless communication system of the present invention is the above-described wireless communication system, wherein the frequency band determination unit instructs the quality measurement instruction unit to measure the wireless quality as a component carrier for transmitting the data.
- the component carrier is notified to the terminal station apparatus, and the reception unit of the terminal station apparatus receives only the notified component carrier, and determines the frequency band
- the unit selects one of the plurality of component carriers as the anchor carrier based on the radio quality reported from the terminal station apparatus, and when the component carrier as the anchor carrier is changed by the selection Along with the notification of the component carrier to the terminal station apparatus, To notify the component carrier to the carrier.
- the wireless communication system of the present invention is the above-described wireless communication system, wherein the frequency band determination unit instructs the quality measurement instruction unit to measure the wireless quality as a component carrier for transmitting the data.
- the frequency band determination unit instructs the quality measurement instruction unit to measure the wireless quality as a component carrier for transmitting the data.
- the component carrier is notified to the terminal station apparatus, and the receiving unit of the terminal station apparatus receives only the notified component carrier.
- a wireless communication method includes a terminal station apparatus and a base station apparatus that transmits data to the terminal station apparatus using a plurality of component carriers that are communication frequency bands for performing wireless communication.
- the base station apparatus starts transmitting data to the terminal station apparatus or when changing the component carrier used for transmitting data to the terminal station apparatus.
- a first process of determining a component carrier to transmit the data and notifying the terminal station apparatus, and the base station apparatus in the first process A second process of transmitting the data using the determined component carrier, and the terminal station device communicates in the second process. It receives the signal of the component carriers, and a third step of obtaining the data sent.
- a base station apparatus of the present invention is a base station apparatus that transmits data to a terminal station apparatus using a plurality of component carriers that are communication frequency bands for performing wireless communication, and transmits data to the terminal station apparatus.
- the component carrier for transmitting the data is determined based on the radio quality of each of the plurality of component carriers
- a frequency band determination unit that notifies the terminal station device, and a transmission unit that transmits the data using the component carrier determined by the frequency band determination unit.
- a terminal station apparatus is a terminal station apparatus that receives data transmitted by a base station apparatus using a plurality of component carriers that are continuous frequency bands, and the base station apparatus includes the terminal station apparatus.
- the base station apparatus includes the terminal station apparatus.
- a component carrier signal determined based on the radio quality of the plurality of component carriers is received.
- a receiving unit for receiving data transmitted by the base station apparatus.
- the present invention even when carrier aggregation for performing communication by collecting a plurality of carriers is applied, an increase in power consumption is suppressed, and at the same time, a decrease in communication efficiency when changing a component carrier used for communication can be suppressed. it can.
- FIG. 1 is a conceptual diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention. It is a schematic block diagram which shows the structure of the terminal station apparatus 10 and the base station apparatus 20 in the embodiment. It is a schematic block diagram which shows the structure of the control part 25 of the base station apparatus 20 in the embodiment. It is a schematic block diagram which shows the structure of the control part 15 of the terminal station apparatus 10 in the embodiment.
- FIG. 6 is a sequence diagram showing an operation sequence example A between the terminal station device 10 and the base station device 20 in the same embodiment. It is a figure which shows the image of the component carrier utilized in the operation sequence example A in the embodiment.
- FIG. 7 is a sequence diagram showing an operation sequence example B between the terminal station device 10 and the base station device 20 in the same embodiment.
- FIG. 7 is a sequence diagram showing an operation sequence example C between the terminal station device 10 and the base station device 20 in the same embodiment. It is a figure which shows the image of the component carrier utilized in the operation
- FIG. 7 is a sequence diagram showing an operation sequence example D between the terminal station device 10 and the base station device 20 in the same embodiment. It is a figure which shows the image of the component carrier utilized in the operation
- FIG. 7 is a sequence diagram showing an operation sequence example F between the terminal station device 10 and the base station device 20 in the same embodiment. It is a figure which shows the image of the component carrier utilized in the operation
- FIG. 7 is a sequence diagram showing an operation sequence example G between the terminal station device 10 and the base station device 20 in the same embodiment. It is a figure which shows the image of the component carrier utilized in the operation sequence example G in the embodiment. 7 is a sequence diagram showing an operation sequence example H between the terminal station device 10 and the base station device 20 in the embodiment.
- FIG. 1 is a conceptual diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- carrier aggregation communication is performed between the base station apparatus 20 and the terminal station apparatus 10 using a plurality of component carriers that are continuous frequency bands and communication frequency bands for wireless communication.
- uplink communication from the terminal station device 10 to the base station device 20 is omitted, and only the concept of downlink communication is described.
- the base station apparatus 20 transmits component carriers CC-A, B, and C, which are three continuous frequency bands, each having a bandwidth of 20 MHz or less.
- the terminal station apparatus receives all the signals of the component carriers CC-A, B, and C and demodulates them, thereby realizing high-speed and large-capacity downlink communication.
- the number of component carriers is three in the present embodiment, the present invention can be applied if there are a plurality of component carriers such as two or more than three.
- each of a plurality of base station devices instead of transmitting all component carrier signals from one base station device, each of a plurality of base station devices transmits signals of different component carriers, and the terminal station device receives them simultaneously.
- a configuration for performing communication may be used.
- FIG. 2 is a schematic block diagram illustrating configurations of the terminal station device 10 and the base station device 20.
- the terminal station device 10 includes a transmission antenna unit 11, a transmission unit 12, a reception antenna 13, a reception unit 14, and a control unit 15.
- the control unit 15 includes a CA (Career Aggregation) control unit 16.
- the transmission antenna unit 11 transmits an OFDM signal in the radio frequency band generated by the transmission unit 12.
- the transmission unit 12 performs processing related to generation of a transmission signal (OFDM signal) of the terminal station apparatus 10 for the transmission data (UL user data, UL control information) input from the control unit 15.
- the terminal station apparatus 10 is described as generating and transmitting an OFDM signal in uplink communication, but generates a signal of another multicarrier communication system or a single carrier communication system. May be transmitted.
- the receiving antenna unit 13 receives an OFDM signal in the radio frequency band transmitted from the base station device 20.
- the receiving unit 14 performs processing related to reception in the terminal station device 10 such as demodulation and decoding on the OFDM signal received by the receiving antenna unit 13 and receives received data (DL user data, DL control) as a result of the processing. Information) is output to the control unit 15. That is, the receiving unit 14 receives data transmitted by the base station device 20.
- the control unit 15 performs various controls of the terminal station device 10.
- the CA control unit 16 performs control related to carrier aggregation.
- the CA control unit 16 of the terminal station device 10 acquires the carrier aggregation instruction information notified from the base station device 20 from the reception unit 14, and based on the instruction information, controls the carrier aggregation communication and the radio quality of the component carrier. Measure and so on.
- the base station apparatus 20 includes a transmission antenna unit 21, an MS transmission unit 22, a reception antenna unit 23, an MS reception unit 24, a control unit 25, a CA control unit 26, a CN transmission unit 27, and a CN reception unit 28.
- the transmission antenna unit 21 transmits an OFDM signal in the radio frequency band generated by the MS transmission unit 22.
- the MS transmission unit 22 performs processing related to generation of a transmission signal (OFDM signal) to the terminal station device 10 of the base station device 20 for the transmission data (DL user data, DL control information) input from the control unit 25.
- the MS transmission unit 22 places a transmission signal on the component carrier instructed by the control unit 25.
- the receiving antenna unit 23 receives an OFDM signal in the radio frequency band transmitted from the terminal station device 10.
- the MS receiving unit 24 performs processing related to reception in the base station apparatus 20 such as demodulation and decoding on the OFDM signal received by the receiving antenna unit 23, and receives received data (UL user data, UL, etc.) as a result of the processing. Control information) is output to the control unit 25.
- the CN transmission unit 27 performs processing related to generation of a transmission signal to the core network 30 of the base station device 20.
- the CN receiving unit 28 performs processing related to a reception signal from the core network 30 of the base station device 20.
- the control unit 25 performs various controls of the base station device 20.
- the CA control unit 26 controls carrier aggregation. That is, the CA control unit 26 determines whether to perform carrier aggregation communication, determines the component carrier to be used for carrier aggregation, and further performs carrier aggregation communication based on the communication data amount, QoS (Quality of Service), wireless quality, and the like. Take control. Both the CN receiving unit 28 and the CN receiving unit 27 are connected to the core network 30.
- FIG. 2 shows a state in which component carriers CC-A, B, and C are simultaneously transmitted from the transmission antenna unit 21 of the base station apparatus 20 to the terminal station apparatus 10.
- a state in which three component carriers are transmitted from one antenna unit 21 is shown.
- the transmission antenna unit 21 includes three antennas and transmits one component carrier from one antenna. You may make it do.
- the MS transmission unit 22 may also include three processing units, and each processing unit may generate a signal of one component carrier. Moreover, you may make it respond
- FIG. 3 is a schematic block diagram illustrating a configuration of the control unit 25 of the base station apparatus 20.
- the control unit 25 of the base station apparatus 20 includes a CA control unit 26.
- the CA control unit 26 includes a DL (Down Link) data amount / QoS acquisition unit 261, a CA / early communication / quality measurement determination unit 262, a radio quality acquisition unit 263, an anchor C (carrier) / CC determination unit 264, a CA.
- a communication control unit 265 is provided.
- the DL data amount / QoS acquisition unit 261 is a DL user data and DL control information data amount transmitted from the DL user data and DL control information received by the CN receiving unit 28 from the core network 30 to the terminal station apparatus 10.
- the amount of data and the QoS when transmitting the transmission data are acquired.
- QoS includes bearer information required for voice service, packet service, TV phone service, and the like.
- the CA / early communication / quality measurement determination unit 262 determines whether or not to perform carrier aggregation based on the DL data amount and QoS output from the DL data amount / QoS acquisition unit 261. It is determined whether or not to perform communication and whether or not the terminal station apparatus 10 is to measure the radio quality (reception power, SNR (SignalSignto Noise Ratio), SINR (Signal to Interference Noise Ratio), etc.) of each component carrier.
- the early communication uses the carrier (anchor carrier) on which the terminal station apparatus 10 is currently monitoring the radio quality before carrier aggregation or before measuring the quality of the component carrier. Refers to early communication.
- the CA / early communication / quality measurement determination unit 262 has been described as determining whether the early communication is performed / not performed. However, the early communication is always performed without determining whether the early communication is performed / not performed. Or early communication may not be performed.
- the CA / early communication / quality measurement determination unit 262 calculates a necessary effective communication band based on, for example, the DL data amount and QoS, and the effective communication estimated from the bandwidth of the anchor carrier and its radio quality. Whether to perform carrier aggregation is determined based on whether or not the band satisfies the effective communication band. When the estimated effective communication band satisfies the required effective communication band and the result of this determination is not performed, it is determined that it is not necessary to measure the radio quality of other component carriers.
- the CA / early communication / quality measurement determination unit 262 may measure the size of the transmission data and compare it with a preset threshold value. For example, in the case of receiving a large amount of data that is equal to or greater than the threshold value, early communication may not be performed, and in the case of receiving a small amount of data, early communication may be performed.
- the CA / early communication / quality measurement determination unit 262 implements / does not execute a quality measurement request
- a quality measurement request for example, when communication is performed using only an anchor carrier, At least the anchor carrier's radio quality is exchanged between them, so if the radio quality is so good that aggregation communication is not necessary, if the radio quality according to the amount of transmission data is satisfied, It is determined that the quality measurement is not performed, and when it is not satisfied, it is determined that it is performed.
- the CA / early communication / quality measurement determination unit 262 determines that carrier aggregation is not performed. In this case, since there is no need for communication with other component carriers, the quality measurement request may be determined to be not implemented.
- the CA / early communication / quality measurement determination unit 262 determines the early communication request (execution / non-execution) and the quality measurement request (based on the determination result of the execution / non-execution of the early communication request and the execution / non-execution of carrier aggregation. (Execution / non-execution) is output.
- the component carriers for measuring the radio quality may be all component carriers that can be used for the functions provided in the terminal station device 10 notified from the terminal station device 10 at the time of communication connection or the like, or used in the previous communication.
- the carrier may be a component carrier determined by the CA / early communication / quality measurement determination unit 262 based on the usage status of the component carrier or the like.
- the component carrier for measuring the radio quality may be set uniquely for each terminal station device 10 or may be unique for each base station device 20.
- the CA instruction information as the determination results that is, the information of the early communication instruction (instruction of implementation or non-implementation of early communication) and the instruction of quality measurement (instruction of implementation or non-execution of wireless quality measurement) is sent to the MS transmission unit 22.
- the terminal station apparatus 10 is notified via the transmitting antenna unit 21 using, for example, an anchor carrier. That is, the CA / early communication / quality measurement determination unit 262 instructs the terminal station device 10 to perform radio quality measurement and early communication on the component carrier when starting transmission of data to the terminal station device 10.
- the radio quality acquisition unit 263 acquires the radio quality of each component carrier from the UL control information and notifies the anchor C / CC determination unit 264 of the radio quality.
- the UL control information is received from the terminal station apparatus 10 by the MS receiving unit 24 together with the UL user data.
- the anchor C / CC determination unit 264 (also referred to as a frequency band determination unit) changes the anchor carrier based on the requirements for transmission of DL user data in addition to the radio quality of each component carrier notified from the radio quality acquisition unit 263. Determine whether to implement.
- the request condition regarding the transmission of DL user data includes the DL data amount notified from the DL data amount / QoS acquisition unit 261, or the QoS (service quality) notified similarly.
- the anchor C / CC determination unit 264 performs carrier aggregation based on the above-described radio quality, DL data amount, and QoS.
- the anchor C / CC determination unit 264 is based on the radio quality in each component carrier reported from the terminal station apparatus 10 as a response to the radio quality measurement instruction from the CA / early communication / quality measurement determination unit 262.
- the component carrier which transmits data is determined.
- the MS transmission unit 22 (also referred to as a transmission unit) transmits data using the component carrier determined by the anchor C / CC determination unit 264.
- the anchor C / CC determination unit 264 has a problem that the wireless quality of the anchor carrier currently used is inferior to a predetermined value, and the wireless quality of other component carriers is better. In this case, the anchor carrier is changed to an anchor carrier having better radio quality. Further, the anchor C / CC determination unit 264 determines the number of component carriers in accordance with the DL data amount / QoS, and selects a component carrier with good radio quality.
- the anchor C / CC determination unit 264 exchanges control information with the CA / early communication / quality measurement determination unit 262.
- the CA / early communication / quality measurement determination unit 262 notifies the carrier aggregation execution / non-execution information.
- the carrier aggregation execution / non-execution determination is performed by the CA / early communication / quality measurement determination unit 262, but may be performed by the anchor C / CC determination unit 264, or may be performed by the CA / early determination.
- the communication / quality measurement determination unit 262 and the anchor C / CC determination unit 264 may perform both. Moreover, you may install separately the CA determination part which performs determination of implementation / non-execution of carrier aggregation.
- the anchor carrier is changed based on the radio quality.
- the anchor carrier may be a predetermined component carrier.
- the anchor C / CC determination unit 264 is used. Only has a function of determining a component carrier to be aggregated, and does not need to determine an anchor carrier.
- the CA communication control unit 265 includes a DL data amount / QoS acquisition unit 261, a CA / early communication / quality measurement determination unit 262, a radio quality acquisition unit 263, an anchor C / CC determination unit 264, an MS transmission unit 22, and an MS reception unit 24. To control carrier aggregation communication.
- FIG. 4 is a schematic block diagram illustrating the configuration of the control unit 15 of the terminal station device 10.
- the control unit 15 of the terminal station device 10 includes a CA control unit 16.
- the CA control unit 16 includes a CA instruction information acquisition unit 161, a quality measurement control unit 162, and a CA communication control unit 163.
- the CA instruction information acquisition unit 161 acquires CA instruction information from the DL control information received by the reception unit 14 together with the DL user data. This CA instruction information is notified to the quality measurement control unit 162.
- the quality measurement control unit 162 (also referred to as a quality measurement unit) notifies the reception unit 14 of the quality measurement control information based on the CA instruction information notified from the CA instruction information acquisition unit 161, so that the CA of the base station apparatus 20 can perform the CA measurement information. / Early communication / Measurement of radio quality with a plurality of component carriers instructed by the quality measurement determination unit 262.
- the receiving unit 14 performs radio quality measurement using a reference signal, which is a known signal in each component carrier, according to the instruction by the quality measurement control information, and outputs the measurement result to the quality measurement control unit 162.
- the quality measurement control unit 162 outputs the quality measurement result received from the reception unit 14 as UL control information to the transmission unit 12, so that the UL control information, that is, the measured radio quality, together with the UL user data, is transmitted to the base station. Transmit to device 20.
- the CA communication control unit 163 controls the CA aggregation information acquisition unit 161, the quality measurement control unit 162, the reception unit 14, and the transmission unit 12, and controls carrier aggregation communication.
- FIG. 5 is a sequence diagram showing an operation sequence example A between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 6 is a diagram illustrating an image of a component carrier used in the operation sequence example A.
- the horizontal axis is a time axis.
- FIG. 6 shows information transmitted on each of downlink (DL) component carriers CC-A to E and uplink (UL).
- DL downlink
- UL uplink
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 has already performed downlink communication with the base station device 20 using the component carrier CC-B which is an anchor carrier (Sa1 in FIG. 5, t1 in FIG. 6). To t3). At this stage, since the amount of data being communicated is small or no data is generated, communication is performed using only one component carrier (component carrier CC-B), and power consumption is reduced. And
- the terminal station apparatus 10 has in advance band information (center frequency and bandwidth) about component carriers (here, component carriers CC-A to E) that are candidates for carrier aggregation by acquiring at the time of communication connection. This is a state in which each component carrier is synchronized. In addition, you may make it synchronize when measuring the quality of each component carrier, or when communication with each component carrier generate
- band information center frequency and bandwidth
- the DL data amount / QoS acquisition unit 261 in the CA control unit 26 acquires the DL data amount and QoS from the DL user data and DL control information received from the CN reception unit 28.
- the DL data amount and QoS are sent to the CA / early communication / quality measurement determination unit 262, and are used to determine whether or not to perform carrier aggregation (CA determination). Further, the CA / early communication / quality measurement determination unit 262 determines whether or not to measure the radio quality of each component carrier (quality measurement determination), and performs early determination between the terminal station device 10 and the base station device 20. It is also determined whether to perform communication (early communication determination).
- the base station apparatus 20 changes the component carrier used for transmitting DL user data to the terminal station apparatus 10. Specifically, when the DL data amount / QoS acquisition unit 261 of the base station apparatus 20 detects a change in the DL data amount, the CA / early communication / quality measurement determination unit 262 performs CA determination and quality measurement determination ( Sa2). In this operation sequence example, it is assumed that it is determined that carrier aggregation is performed and wireless quality is measured.
- the CA / early communication / quality measurement determination unit 262 of the base station apparatus 20 sends a quality measurement request (implementation) that is a request for the terminal station apparatus 10 to measure the radio quality of each component carrier, to the MS transmission unit 22. And transmitted using the anchor carrier (CC-B) (Sa3, t4).
- the terminal station apparatus 10 may also be notified of information necessary for measuring the radio quality of the component carriers CC-A to E that are candidates for carrier aggregation. Further, a component carrier that is a target of wireless quality measurement may be specified in the quality measurement request.
- the quality measurement control unit 162 of the terminal station apparatus 10 starts monitoring each component carrier notified in accordance with the radio quality measurement request (implementation) received from the base station apparatus 20, and starts measuring the radio quality.
- the receiving unit 14 is controlled (Sa4, t8).
- the receiving unit 14 measures the received power of the reference signal of each component carrier, and calculates a quality measurement result indicating radio quality such as CQI (Channel Quality Indicator) from the measured value.
- CQI Channel Quality Indicator
- the quality measurement control unit 162 outputs the quality measurement result indicating the radio quality measured by the reception unit 14 to the transmission unit 12 as UL control information and transmits it to the base station device 20 (Sa5, t10).
- the radio quality acquisition unit 263 in the control unit 25 of the base station apparatus 20 acquires the radio quality of each component carrier notified from the terminal station apparatus 10 and notifies the anchor C / CC determination unit 264.
- the anchor C / CC determination unit 264 performs anchor carrier change determination, which is determination as to whether or not the anchor carrier needs to be changed, based on the radio quality, the DL data amount received from the DL data amount / QoS acquisition unit 261, and QoS. If necessary, determine the anchor carrier.
- CC determination which is determination of the component carrier used for carrier aggregation communication is also performed (Sa6). Although not shown in FIGS. 5 and 6, it may be determined again whether to perform carrier aggregation.
- the anchor carrier is not changed and it is determined that the carrier aggregation communication is performed on the component carriers CC-A, B, and D.
- the component carriers used for this carrier aggregation communication may be selected in the order of, for example, those with good radio quality, or assigned from component carriers with better radio quality than a predetermined value. You may select in an order from the thing with few terminal station apparatuses 10. FIG.
- the anchor C / CC determination unit 264 includes an anchor carrier change request (non-execution) indicating that the anchor carrier is not changed, and a CC notification (CC-A, B, B) for notifying a component carrier used for carrier aggregation. D) is output to the MS transmission unit 22 and notified to the terminal station apparatus 10 using an anchor carrier (in this case, CC-B) (Sa7, t13).
- an anchor carrier in this case, CC-B
- the terminal station apparatus 10 Upon receiving the anchor carrier change request (not implemented) and the CC notification (CC-A, B, D), the terminal station apparatus 10 performs downlink aggregation by carrier aggregation using only the notified component carriers CC-A, B, D. Make communication (reception) ready. That is, reception of the component carriers CC-C and E by the receiving unit 14 is stopped.
- the control unit 25 of the base station apparatus 20 outputs the DL user data and DL control information received from the core network 30 by the CN receiving unit 28 to the MS transmitting unit 22, and the anchor C / Transmission is performed using the component carriers CC-A, B, and D determined by the CC determination unit 264. Thereby, downlink communication by aggregation in CC-A, B, and D is started (Sa8, t14).
- the terminal station device 10 notifies the base station device 20 that reception is possible after the base station device 20 is ready to receive the component carrier notified by the CC notification. Thereafter, the base station apparatus 20 that has received the notification may start downlink transmission.
- the anchor C / CC determination unit 264 determines a part of the component carrier for which the CA / early communication / quality measurement determination unit 262 instructs the measurement of the radio quality as the component carrier for transmitting DL user data. Notifies the terminal station device 10 of the component carrier, and the receiving unit 14 of the terminal station device 10 receives only the notified component carrier. Therefore, when carrier aggregation is performed using only some of the component carriers, the RF front end corresponding to the unused component carrier is stopped from the RF front end provided in the receiving unit 14 of the terminal station device 10. Therefore, power consumption can be reduced.
- FIG. 7 is a sequence diagram showing an operation sequence example B between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 8 is a diagram illustrating an image of a component carrier used in the operation sequence example B.
- the horizontal axis is a time axis.
- FIG. 8 shows information transmitted on each of downlink (DL) component carriers CC-A to E and uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station apparatus 10 has already performed downlink carrier aggregation communication with the base station apparatus 20 using the component carrier CC-B and the component carriers CC-A and D that are anchor carriers. (Sb1 in FIG. 7, t1 to t3 in FIG. 8).
- the downlink data amount decreases (Sb1-1)
- the DL data amount / QoS acquisition unit 261 of the base station apparatus 20 detects a change in the DL data amount
- CA / early communication / quality measurement determination The unit 262 performs CA determination and quality measurement determination (Sb2).
- the base station apparatus 20 transmits the CA instruction information including the quality measurement request (execution) to the terminal station apparatus 10 using the anchor carrier (CC-B) (Sb3, t4).
- the terminal station apparatus 10 performs radio quality measurement of the notified component carrier (Sb4, t8) and notifies the measurement result to the base station apparatus 20 (Sb5, t10).
- the anchor C / CC determination unit 264 of the base station apparatus 20 performs anchor carrier change determination and CC determination based on the DL data amount and QoS in addition to the radio quality of each component carrier notified from the terminal station apparatus 10 (Sb6). ). In this operation sequence example, it is assumed that it is determined to switch to communication using only the component carrier CC-D.
- the anchor carrier is also changed to the component carrier CC-D.
- the determined information includes the anchor carrier change request and the CC notification indicating the determined component carrier CC-D, using the currently used anchor carrier (CC-B), and the base station apparatus 20 uses the terminal station 20 The device 10 is notified (Sb7, t13). Thereafter, the anchor carrier is changed between the terminal station device 10 and the base station device 20 (Sb8), and downlink communication using the component carrier CC-D is started (Sb9, t14).
- FIG. 9 is a sequence diagram showing an operation sequence example C between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 10 is a diagram illustrating an image of a component carrier used in the operation sequence example C.
- the horizontal axis is the time axis.
- FIG. 10 shows information transmitted on each of the downlink (DL) component carriers CC-A to E and the uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 has already performed downlink communication using the component carrier CC-B (Sc1 in FIG. 9, t1 to t3 in FIG. 10).
- the anchor carrier is a component carrier CC-B.
- the radio quality acquisition unit 263 of the base station apparatus 20 detects a decrease in radio quality.
- the CA / early communication / quality measurement determination unit 262 is notified of the decrease in radio quality, and the CA / early communication / quality measurement determination unit 262 that receives the notification performs CA determination and quality measurement determination (Sc2).
- the base station apparatus 20 notifies the terminal station apparatus 10 of a quality measurement request (execution) (Sc3, t4).
- the terminal station apparatus 10 measures the radio quality of each component carrier (Sc4), and notifies the base station apparatus 20 (Sc5, t10).
- the base station device 20 performs anchor carrier change determination and CC determination based on the DL data amount and QoS in addition to the radio quality of each component carrier notified from the terminal station device 10 (Sc6). In this operation sequence example, it is assumed that it is determined to switch to communication using only the component carrier CC-D.
- the base station apparatus 20 sends an anchor carrier change request and a CC notification (CC-D) indicating the determined component carrier CC-D to the anchor carrier. This is used to notify the terminal station device 10 (Sc7, t13). Thereafter, the anchor carrier is changed to the component carrier CC-D between the terminal station device 10 and the base station device 20 (Sc8), and downlink communication using the component carrier CC-D is started ( Sc9, t14).
- CC-D CC notification
- FIG. 11 is a sequence diagram showing an operation sequence example D between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 12 is a diagram illustrating an image of a component carrier used in the operation sequence example D.
- the horizontal axis is a time axis.
- FIG. 12 shows information transmitted on each of the downlink (DL) component carriers CC-A to E and the uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 is camping on the component carrier CC-B. That is, the component carrier CC-B is an anchor carrier for the terminal station device 10 (a carrier serving as a base for the terminal station device 10).
- the terminal station device 10 is in a standby state with the component carrier CC-B, and the quality measurement control unit 162 of the terminal station device 10 periodically measures the radio quality for the component carrier CC-B, that is, the anchor carrier. (Sd1 in FIG. 11, t1 to t2 in FIG. 12). Note that, as the measurement of the radio quality, for example, measurement of the received power of the reference signal of the component carrier CC-B can be considered.
- the terminal station device 10 has in advance band information (center frequency and bandwidth) about component carriers (here, CC-A to E) that are candidates for carrier aggregation by acquiring at the time of communication connection, etc. It is in a state of being synchronized with the component carrier, synchronized when measuring the quality of each component carrier, or synchronized when communication with each component carrier occurs.
- component carriers here, CC-A to E
- the CN receiving unit 28 of the base station device 20 receives DL user data and DL control information of the communication. To do.
- the DL data amount / QoS acquisition unit 261 in the CA control unit 26 acquires the DL data amount and QoS from the DL user data and DL control information received from the CN reception unit 28.
- the DL data amount and QoS are sent to the CA / early communication / quality measurement determination unit 262 to determine whether to perform carrier aggregation (CA determination).
- CA determination carrier aggregation
- the CA / early communication / quality measurement determination unit 262 determines whether to perform early communication between the terminal station apparatus 10 and the base station apparatus 20 (early communication determination), and measures the radio quality of each component carrier. Whether to implement (quality measurement determination) is also performed (Sd3). In this operation sequence example, carrier aggregation is performed, early communication is performed using the anchor carrier (component carrier CC-B) between the terminal station apparatus 10 and the base station apparatus 20, and the radio quality of each component carrier is determined. It is assumed that it is determined that the measurement is also performed.
- the CA / early communication / quality measurement determination unit 262 of the base station apparatus 20 causes the terminal station apparatus 10 to perform early notification execution request (implementation), which is a request to perform early communication, and measures the radio quality of each component carrier.
- the quality measurement request (execution), which is a request, is output to the MS transmission unit 22 and transmitted using the anchor carrier (CC-B) (Sd4, t4).
- the terminal station apparatus 10 is also notified of information necessary for measuring the radio quality of the component carriers CC-A to E that are candidates for carrier aggregation.
- the control unit 25 of the base station apparatus 20 outputs the simultaneous call to the MS transmission unit 22 and transmits it using the anchor carrier (CC-B) (Sd5, t5). ).
- the terminal station device 10 that has received the early communication request (execution) and the general call returns a general call response to the base station device 20 (Sd6, t6), and a component carrier is transmitted between the terminal station device 10 and the base station device 20.
- Downlink communication using CC-B is started (Sd7, t6). That is, when starting transmission of DL user data to the terminal station device 10, the MS transmission unit 22 of the base station device 20 uses each component carrier as a response to an instruction from the CA / early communication / quality measurement determination unit 262.
- transmission of DL user data and DL control information is started using only the component carrier CC-B which is an anchor carrier.
- the terminal station apparatus 10 monitors only the component carrier CC-B that is an anchor carrier, and receives DL user data and DL control information transmitted by the base station apparatus 20.
- the CA determination, the early communication determination, the quality measurement determination (Sd3), and the early communication request and the quality measurement request from the base station apparatus 20 to the terminal Transmission to the station device 10 may be performed.
- the operation sequence is being connected (during Connect), and the early communication determination and the early communication request are not transmitted.
- quality measurement control section 162 of terminal station apparatus 10 starts monitoring component carriers CC-A to E in accordance with the radio quality measurement request (execution) received from base station apparatus 20 in sequence Sd4 (component carrier For CC-B, the measurement of the radio quality is periodically performed), and the reception unit 14 is controlled to start the measurement of the radio quality (Sd8, t8).
- the received power of the reference signal of each component carrier is measured, and a quality measurement result indicating radio quality such as CQI (Channel Quality Indicator) is calculated from the measured value.
- CQI Channel Quality Indicator
- the quality measurement control unit 162 outputs the quality measurement result indicating the radio quality measured by the reception unit 14 as UL control information to the transmission unit 12 and transmits it to the base station apparatus 20 (Sd9, t10).
- the radio quality acquisition unit 263 in the control unit 25 of the base station apparatus 20 acquires the radio quality of each component carrier notified from the terminal station apparatus 10 and notifies the anchor C / CC determination unit 264.
- the anchor C / CC determination unit 264 performs anchor carrier change determination, which is determination as to whether or not the anchor carrier needs to be changed, based on the radio quality, the DL data amount received from the DL data amount / QoS acquisition unit 261, and QoS. If necessary, an anchor carrier is determined (Sd10).
- CC determination which is the determination of the component carrier used for carrier aggregation communication is also performed. Although not shown in FIGS. 11 and 12, it may be determined again whether to perform carrier aggregation.
- the anchor carrier is not changed, and the anchor C / CC determination unit 264 of the base station apparatus 20 uses the component carriers CC-A, B, and D as the component carriers used for carrier aggregation. Is selected. This selection may be made, for example, in descending order of radio quality, or the number of allocated terminal station devices 10 is smaller from among component carriers having better radio quality than a predetermined value. You may choose in order from thing.
- the anchor C / CC determination unit 264 includes an anchor carrier change request (non-execution) indicating that the anchor carrier is not changed, and a CC notification (CC-A, B, B) for notifying a component carrier used for carrier aggregation. D) is output to the MS transmitter 22 and notified to the terminal station apparatus 10 using the anchor carrier (Sd11, t13).
- the terminal station apparatus 10 that has received the anchor carrier change request (non-execution) of sequence Sd11 and the CC notification (CC-A, B, D) is based on the carrier aggregation using only the notified component carriers CC-A, B, D. A state in which downlink communication (reception) can be started. Subsequently (or at the same time), the control unit 25 of the base station apparatus 20 outputs the DL user data and DL control information received from the core network 30 by the CN receiving unit 28 to the MS transmitting unit 22, and the anchor C / Transmission is performed using the component carriers CC-A, B, and D determined by the CC determination unit 264.
- downlink communication by aggregation in the component carriers CC-A, B, and D is started (Sd12, t14).
- the terminal station device 10 notifies the base station device 20 that the signal can be received after the component carrier notified by the base station device 20 is ready for reception, and then The base station apparatus 20 that has received the notification may start downlink transmission.
- the anchor C / CC determination unit 264 determines a part of the component carrier for which the CA / early communication / quality measurement determination unit 262 instructs the measurement of the radio quality as the component carrier for transmitting DL user data. (Sd10), the component carrier is notified to the terminal station device 10 (Sd11), and the receiving unit 14 of the terminal station device 10 receives only the notified component carrier (Sd12). Therefore, when carrier aggregation is performed using only some of the component carriers, the RF front end corresponding to the unused component carrier is stopped from the RF front end provided in the receiving unit 14 of the terminal station device 10. Therefore, power consumption can be reduced.
- FIG. 13 is a sequence diagram showing an operation sequence example E between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 14 is a diagram illustrating an image of a component carrier used in the operation sequence example E.
- the horizontal axis is the time axis.
- FIG. 14 shows information transmitted on each of downlink (DL) component carriers CC-A to E and uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 is camping on the component carrier CC-B.
- the terminal station device 10 is in a standby state with the component carrier CC-B, and measures the radio quality of the component carrier CC-B (Se1 in FIG. 13, t1 to t2 in FIG. 14).
- the terminal station device 10 when a transmission request is generated by a user's transmission operation (Se2), the terminal station device 10 notifies the base station device 20 of the transmission request (Se3, t3).
- the CA / early communication / quality measurement determination unit 262 of the base station device 20 performs CA determination, early communication determination, quality Perform measurement judgment.
- the terminal station apparatus 10 measures the radio quality of the component carrier designated by the quality measurement request (execution) notified from the base station apparatus 20 (Se7), and the measured radio quality is transmitted to the base station apparatus 20. (Se8, t10).
- the anchor C / CC determination unit 264 of the base station device 20 performs anchor carrier change determination and carrier aggregation based on the downlink traffic and QoS in addition to the radio quality of each component carrier notified from the terminal station device 10.
- the component carrier to be used is selected (Se9). In this operation sequence example, it is assumed that anchor carriers are not changed, and component carriers CC-A, B, C, D, and E are selected as component carriers for carrier aggregation.
- the anchor C / CC determination unit 264 outputs these determination results to the MS transmission unit 22 as an anchor carrier change request (non-execution) and a CC notification (A, B, C, D, E).
- the terminal station device 10 is notified using (CC-B) (Se10, t13).
- the control unit 25 of the base station apparatus 20 outputs the DL user data and the DL control information received by the CN receiving unit 28 from the core network 30 to the MS transmitting unit 22, and the anchor C / CC determining unit 264 first outputs the DL user data and DL control information. Transmission is performed using the determined component carriers CC-A, B, C, D, and E.
- the terminal station device 10 that has received the anchor carrier change request (non-execution) and the CC notification (CC-A, B, C, D, E) of the sequence Se10 receives the notified component carriers CC-A, B, C, D , E starts downlink communication (reception) by carrier aggregation (Se11, t14).
- FIG. 15 is a sequence diagram showing an operation sequence example F between the terminal station apparatus 10 and the base station apparatus 20 in the present embodiment.
- FIG. 16 is a diagram illustrating an image of a component carrier used in the operation sequence example F.
- the horizontal axis is the time axis.
- FIG. 16 shows information transmitted on each of the downlink (DL) component carriers CC-A to E and the uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 is camping on the component carrier CC-B.
- the terminal station device 10 is in a standby state with the component carrier CC-B, and measures the radio quality of the component carrier CC-B (Sf1 in FIG. 15, t1 to t2 in FIG. 16).
- the CA / early communication / quality measurement determination unit 262 of the base station device 20 From the downlink traffic volume and QoS, CA determination, early communication determination, and quality measurement determination are performed (Sf3).
- carrier aggregation is performed by these determination processes, and early communication using the component carrier CC-B between the terminal station device 10 and the base station device 20 is performed.
- the base station apparatus 20 uses the anchor carrier (CC-B) to transmit CA instruction information including an early communication request (non-execution) and a quality measurement request (execution) indicating that early communication is not to be performed. It transmits to the station apparatus 10 (Sf4, t4), and also transmits a general call (Sf5, t5).
- the terminal station device 10 that has received the early communication request (non-execution) follows the quality measurement request (execution) and returns the component carrier CC-A notified from the base station device 20 before returning the paging response to the base station device 20.
- the wireless quality of .about.E is measured (Sf6).
- the terminal station device 10 transmits the general call response and the radio quality to the base station device 20 (Sf7, t9) (Sf8, t10).
- the anchor C / CC determination unit 264 of the base station apparatus 20 performs anchor carrier change determination and CC fixed determination based on the DL communication amount and QoS in addition to the radio quality of each component carrier notified from the terminal station apparatus 10. (Sf9).
- the anchor carrier is changed and the component carrier CC-C is determined as the anchor carrier.
- component carriers CC-A, C, and D are selected as component carriers for performing carrier aggregation.
- the base station apparatus 20 transmits these determination results to the terminal station apparatus 10 using the anchor carrier (CC-B) before the change (Sf10, t13). Thereafter, the anchor carrier is changed between the terminal station device 10 and the base station device 20, the component carrier CC-C becomes the anchor carrier (Sf11), and the component carriers CC-A, C, and D are used. Downlink carrier aggregation communication is started (Sf12, t14).
- the anchor C / CC determination unit 264 determines a part of the component carrier that the CA / early communication / quality measurement unit 262 instructs to measure the radio quality as the component carrier for transmitting DL user data. (Sf9), the component carrier is notified to the terminal station apparatus 10 (Sf10), and the receiving unit 14 of the terminal station apparatus 10 receives only the notified component carrier (Sf12).
- the anchor C / CC determination unit 264 selects one of a plurality of component carriers as an anchor carrier based on the radio quality reported from the terminal station apparatus 10, and the component carrier is selected as the anchor carrier by the selection. Is changed (Sf9), the component carrier as the anchor carrier is notified together with the notification of the component carrier to the terminal station device 10 (Sf10).
- the radio quality (fading status) in the terminal device 10 may vary greatly depending on the component carrier. Even in such a case, it is possible to improve the communication efficiency when carrier aggregation is not performed by selecting a component carrier having a good communication state from among the available component carriers and using it as an anchor carrier. it can.
- FIG. 17 is a sequence diagram showing an operation sequence example G between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 18 is a diagram illustrating an image of a component carrier used in the operation sequence example G.
- the horizontal axis is a time axis.
- FIG. 18 shows information transmitted on each of the downlink (DL) component carriers CC-A to E and the uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 is camping on the component carrier CC-B that is an anchor carrier of the terminal station device 10 (Sg1 in FIG. 17, t1 to t2 in FIG. 18).
- the CA / early communication / quality measurement determination unit 262 of the base station device 20 performs CA determination based on the DL data amount and QoS, and early communication. Determination and quality measurement determination are performed (Sg3).
- the base station apparatus 20 notifies the terminal station apparatus 10 of the CA instruction information including the early communication request (execution), the quality measurement request (execution), and the general call using the anchor carrier (CC-B). (Sg4, t4), (Sg5, t5).
- the terminal station device 10 that has received the early communication request (implementation) and the general call returns a general call response to the base station device 20 (Sg6, t6), and performs downlink communication in the component carrier CC-B as the anchor carrier. Start (Sg7, t6).
- the terminal station apparatus 10 that has received the quality measurement request (execution) measures the radio quality of the component carriers CC-A to E notified from the base station apparatus 20 (Sg8, t8), and notifies the base station apparatus 20 (Sg9, t10).
- the anchor C / CC determination unit 264 of the base station apparatus 20 performs anchor carrier change determination and CC determination based on the DL data amount and QoS in addition to the radio quality of each component carrier notified from the terminal station apparatus 10 (Sg10 ).
- the change of the anchor carrier is decided and the component carrier CC-E is decided as the anchor carrier.
- CA is not implemented, communication is performed using an anchor carrier. Therefore, the anchor C / CC determination unit 264 that has received the CA non-execution instruction from the CA / early communication / quality measurement determination unit 262 performs downlink communication. The process of determining the component carrier to be used for is not performed.
- the base station apparatus 20 transmits an anchor carrier change request (implementation, E) indicating that the anchor carrier is changed to CC-E using the anchor carrier (CC-B) before the change (Sg11, t13).
- the terminal station apparatus 10 changes the anchor carrier from the current component carrier CC-B to the component carrier CC-E according to the anchor carrier change request received from the base station apparatus 20 (Sg12). Thereafter, downlink communication using the component carrier CC-E is started (Sg13, t14).
- FIG. 19 is a sequence diagram showing an operation sequence example H between the terminal station device 10 and the base station device 20 in the present embodiment.
- FIG. 20 is a diagram illustrating an image of a component carrier used in the operation sequence example H.
- the horizontal axis is the time axis.
- FIG. 20 shows information transmitted on each of downlink (DL) component carriers CC-A to E and uplink (UL).
- a rectangle with a symbol U indicates that user data is transmitted and the quality of the component carrier is being measured.
- a rectangle attached with a code CD indicates that control information is transmitted and the quality of the component carrier is being measured.
- a rectangle with the symbol CU indicates that control information is being transmitted.
- a broken-line rectangle labeled with a symbol Q indicates that the quality measurement of the component carrier is being performed.
- the terminal station device 10 is camping on the component carrier CC-B (Sh1 in FIG. 19, t1 to t2 in FIG. 20).
- the CA / early communication / quality measurement determination unit 262 of the base station device 20 determines the CA data from the DL data amount, QoS, and early Communication determination and quality measurement determination are performed (Sh3).
- the early communication determination is determined to be performed.
- the base station apparatus 20 sends the CA instruction information (Sh4, t4) including the early communication request (execution) and the quality measurement request (non-execution) and the general call (Sh5, t5) to the anchor carrier (CC -B) to the terminal station device 10.
- the terminal station device 10 that has received the early communication request (execution), the quality measurement request (non-execution), and the general call returns a general call response to the base station device 20 (Sh6, t6).
- the base station apparatus 20 and the terminal station apparatus 10 that have received them start downlink communication using the component carrier CC-B that is an anchor carrier (Sh7, t6).
- the CA / early communication / quality measurement determination unit 262 determines whether or not to use a plurality of component carriers for DL user data transmission based on the DL data amount and QoS, which are requirements for DL user data transmission. (Sh3) When it is determined that a plurality of terminals are not used, the terminal station apparatus 10 is not instructed to measure the wireless quality (Sh4). When the CA / early communication / quality measurement determination unit 262 determines that a plurality of component carriers are not used for transmitting DL user data, the MS transmission unit 22 transmits DL user data using an anchor carrier ( Sh7).
- the base station device 20 does not instruct measurement of radio quality, that is, a terminal station device. 10 does not report the radio quality other than the anchor carrier. Therefore, only the RF / front-end part is activated corresponding to the anchor carrier, and the RF / front-end part is stopped corresponding to the other component carriers (no radio quality measurement is performed). Can be reduced. However, even in the case of a small amount of data communication as described above, for example, when the radio quality of the anchor carrier is poor, the quality of the component carrier may be measured to change the anchor carrier.
- the number of component carriers to be carrier-aggregated may be controlled by the remaining battery level of the terminal station device 10. In this case, it is necessary to notify the remaining battery level from the control unit 15 of the terminal station device 10 to the base station device 20.
- the anchor C / CC determination unit 264 of the base station device 20 determines the number of carrier aggregations based on the notified remaining battery level. For example, when the battery capacity is smaller than a predetermined set value (the remaining battery level is low), the notified terminal station device 10 is notified by not performing the quality measurement instruction and notifying the terminal station device 10. Perform downlink communication using only the anchor carrier currently in use. As a result, the terminal station device 10 can communicate while suppressing current consumption.
- the number of aggregations is reduced to 2, for example, the remaining battery level is divided into multiple stages, and the number of aggregations is made smaller than the maximum value for each stage. May be.
- the set number of aggregations may be controlled by a manual instruction by the user himself / herself. In this case, the communication speed decreases, but communication can be performed while suppressing current consumption.
- the quality measurement of a plurality of component carriers is performed simultaneously (in the same subframe), but it is also possible to perform the measurement at different times.
- the quality measurement of the component carrier is performed when there is an instruction from the base station apparatus 20, but this may be performed periodically. Thereby, it is not necessary to perform quality measurement at the time of performing the aggregation communication, and it is possible to reduce a delay in which the aggregation communication starts.
- the quality measurement of the component carrier is performed when there is an instruction from the base station apparatus 20, but it may be performed by the terminal station apparatus 10. Thereby, when communication is started from the terminal station apparatus 10, quality measurement can be performed, and delay in the start of aggregation communication can be reduced.
- the base station apparatus 20 performs carrier aggregation communication, early communication, quality measurement, anchor carrier change, and component carrier determination. The determination may be performed by the terminal device 10.
- the component carrier to be used is notified from the base station device 20 to the terminal station device 10, but the component carrier that is not used may be notified.
- received data is generated in bursts. Therefore, in the terminal station apparatus 10, when there is a lot of downlink user data or when data is generated in bursts, as much as possible It is necessary to make it possible to receive data on the component carrier. In this way, when it is in a standby state, or when there is no downlink user data, or when there is little downlink user data, only the radio quality of the anchor carrier or only one Since only the wireless quality of the component carriers is measured and the wireless quality is not measured for the other component carriers, it is not necessary to receive a reference signal and the power consumption can be suppressed.
- the power consumption can be further reduced by stopping the RF / front end units corresponding to other component carriers.
- the terminal station device 10 measures the radio quality of each component carrier and notifies the base station device 20 like the sequence Sd9 in FIG.
- the C / CC determination unit 264 can select a component carrier with good radio quality and suppress a decrease in communication efficiency. Further, when adaptive modulation that changes the coding rate and the number of data modulation multi-values according to the radio quality is used, an appropriate coding rate and data modulation multi-value are determined based on the radio quality measured by the terminal station apparatus 10. The number can be selected, and the communication efficiency can be improved.
- the MS transmission unit 22 of the base station device 20 uses each component carrier as a response to an instruction from the CA / early communication / quality measurement determination unit 262.
- the DL user data transmission request is generated by performing early communication that starts transmission of DL user data and DL control information using only the anchor carrier. Thus, it is possible to prevent the response time until the transmission starts from becoming long.
- carrier aggregation communication is performed by setting component carriers for the number of component carriers that have been grasped.
- the component carrier is set based on the amount of data required at that time, so the amount of data changes more dynamically. Can follow, leading to effective use of resources and reduction of power consumption.
- the number of component carriers to be used for aggregation communication is appropriately grasped, and the number of component carriers to be used is set accordingly, thereby realizing effective use of resources and reduction of power consumption.
- the component carrier quality is measured at the start of carrier aggregation communication, and the component carrier to be used is determined based on the quality measurement. For this reason, it is possible to prevent a component carrier with poor quality from being assigned to carrier aggregation communication.
- the program for realizing the functions of the control unit 25 and the control unit 15 in FIG. 2 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed.
- Each part may be processed by the above, or each part may be realized by dedicated hardware.
- the “computer system” includes an OS and hardware such as peripheral devices.
- the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case is also used to hold a program for a certain period of time.
- the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
- the present invention is suitable for use in a mobile communication system such as a cellular system in which the terminal station device 10 is a mobile station and the base station device 20 is a base station, but is not limited thereto.
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Abstract
Description
本願は、2009年6月2日に、日本に出願された特願2009-133255号に基づき優先権を主張し、その内容をここに援用する。
例えば、コントロールチャネル配置1の場合は、コントロール情報とデータ情報はコンポーネントキャリア毎にそれぞれ対応し合ったペアで存在し、基地局装置から特別な指示がない限り、基地局装置から通知されるキャリアアグリゲーションに用いるコンポーネントキャリアを全て同時に受信しなければならない。但し、端末装置が使用するコンポーネントキャリアになんらかの制限を加えることで、受信可能な状態にしておくコンポーネントキャリア数を減らすことは可能である。
なお、コントロールチャネル配置2については、HARQ(Hybrid Automatic Repeat Request;ハイブリッド自動再送)におけるACK/NACKのフィードバック量を低減する効果が期待される。
そこで、消費電力削減のために、待ち受け状態、または、通信状態で特に通信データ量のない状態や少ない状態においては、ひとつ(または一部)のコンポーネントキャリアのみをモニタし、通信状態で一定以上の通信データ量が発生したときは、基地局装置から端末局装置にアグリゲーションさせるコンポーネントキャリアの通知を行い、その後にアグリゲーション通信に移行させるための技術が検討され始めている。
具体的には、事前に通信していたデータ量から今後のデータ量を予測し、それを基にアグリゲーション通信に向けてアクティブコンポーネントキャリアを決定し、決定させたコンポーネントキャリアを通信可能な状態(アクティブな状態)に用意しておく。
また、非特許文献2においても、非特許文献1同様に、アクティブにするコンポーネントキャリアの決定方法に対する見解は述べられておらず、アンカーキャリア以外のコンポーネントキャリアとの同期の取り方についても記述されていない。このため、無線品質の悪いコンポーネントキャリアをキャリアアグリゲーション通信に利用してしまう可能性がある。
以下、図面を参照して、本発明の実施の形態について説明する。図1は、この発明の一実施形態による無線通信システムの概要構成を示す概念図である。ここでは、基地局装置20と端末局装置10との間で、連続する周波数帯域であり、無線通信を行う通信周波数帯域であるコンポーネントキャリアを複数用いるキャリアアグリゲーション通信が行われている。図1では、端末局装置10から基地局装置20へのアップリンク通信は省略し、ダウンリンク通信の概念のみを記載している。基地局装置20からは、3つの連続する周波数帯域であり、それぞれが20MHz以下の帯域幅であるコンポーネントキャリアCC-A、B、Cが送信されている。端末局装置は、各コンポーネントキャリアCC-A、B、Cの信号を全て受信し、復調することで、高速で大容量なダウンリンク通信を実現している。コンポーネントキャリアは、本実施形態では3つとしているが、2つ、あるいは、3つを越える数など、複数であれば、本発明の適用は可能である。また、ひとつの基地局装置から全てのコンポーネントキャリアの信号を送信するのではなく、複数の基地局装置の各々が、異なるコンポーネントキャリアの信号を送信し、端末局装置が、それを同時に受信して通信を行うような構成であっても良い。
図2は、端末局装置10と基地局装置20の構成を示す概略ブロック図である。端末局装置10は、送信アンテナ部11、送信部12、受信アンテナ13、受信部14、制御部15を具備する。また、制御部15は、CA(Career Aggregation)制御部16を備える。送信アンテナ部11は、送信部12が生成した無線周波数帯のOFDM信号の送信を行う。送信部12は、制御部15から入力された送信データ(ULユーザデータ、UL制御情報)について、端末局装置10の送信信号(OFDM信号)の生成に関する処理を行う。なお、本実施形態において、端末局装置10は、アップリンク通信において、OFDM信号を生成して送信するとして説明するが、その他のマルチキャリア通信方式、あるいは、シングルキャリア通信方式などの信号を生成して送信するようにしてもよい。
図3は、基地局装置20の制御部25の構成を示す概略ブロック図である。基地局装置20の制御部25は、CA制御部26を備える。さらに、CA制御部26は、DL(Down Link)データ量/QoS取得部261、CA/早期通信/品質測定判定部262、無線品質取得部263、アンカーC(キャリア)/CC判定部264、CA通信制御部265を備える。DLデータ量/QoS取得部261は、CN受信部28がコアネットワーク30から受信したDLユーザデータ、DL制御情報から、端末局装置10に送信するDLユーザデータおよびDL制御情報のデータ量であるDLデータ量と、該送信データを送信する際のQoSを取得する。ここで、QoSには、音声サービス、パケットサービス、TV電話サービス等の要求されるベアラ情報も含まれる。
また、CA/早期通信/品質測定判定部262が送信データのサイズを測定し、予め設定された閾値と比較することで判定してもよい。例えば、閾値以上の大容量のデータ受信の場合は、早期通信を不実施とし、少容量のデータ受信の場合は早期通信を実施することにしてもよい。
また、アンカーキャリアの無線品質とは関係なく、音声通信やデータ量が小さいときに、1コンポーネントでの通信が可能、すなわちキャリアアグリゲーションを行なわないとCA/早期通信/品質測定判定部262が判定した場合には、他のコンポーネントキャリアでの通信の必要がないため、品質測定要求は、不実施と判定するようにしてもよい。
無線品質取得部263は、UL制御情報から各コンポーネントキャリアの無線品質を取得し、アンカーC/CC判定部264に通知する。なお、UL制御情報は、MS受信部24が、ULユーザデータと共に端末局装置10から受信する。
CA通信制御部265は、DLデータ量/QoS取得部261、CA/早期通信/品質測定判定部262、無線品質取得部263、アンカーC/CC判定部264、MS送信部22、MS受信部24を制御し、キャリアアグリゲーション通信の制御を行う。
図4は、端末局装置10の制御部15の構成を示す概略ブロック図である。端末局装置10の制御部15は、CA制御部16を備える。さらに、CA制御部16は、CA指示情報取得部161、品質測定制御部162、CA通信制御部163を備える。
CA指示情報取得部161は、受信部14がDLユーザデータとともに受信したDL制御情報からCA指示情報を取得する。このCA指示情報は品質測定制御部162に通知される。
CA通信制御部163は、CA指示情報取得部161、品質測定制御部162、受信部14、送信部12を制御し、キャリアアグリゲーション通信の制御を行う。
図5は、本実施形態における端末局装置10、基地局装置20間の動作シーケンス例Aを示すシーケンス図である。図6は、動作シーケンス例Aにおいて利用されるコンポーネントキャリアのイメージを示す図である。図6において、横軸は時間軸である。また、図6には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
この段階では、通信されているデータ量が少ないか、またはデータが発生していないため、1コンポーネントキャリア(コンポーネントキャリアCC-B)のみでの通信が行われ、消費電力の削減が行われているとする。
また、CA/早期通信/品質測定判定部262は、各コンポーネントキャリアの無線品質の測定を実施するかどうかの判定(品質測定判定)、端末局装置10と基地局装置20との間での早期通信を実施するかどうかの判定(早期通信判定)、も行なう。
ここでは、受信部14は、各コンポーネントキャリアのリファレンスシグナルの受信電力を測定し、測定値からCQI(Channel Quality Indicator;チャネル品質指標)などの無線品質を示す品質測定結果を計算する。
また、このとき、無線品質の測定を行うコンポーネントキャリアとの同期が取れていない場合は、受信部14は、例えば、受信したリファレンスシグナルに基づき、シンボルタイミングを検出して、また、同期が完全に外れている場合は、SCH(Synchronization Channel;同期チャネル)、BCH(Broadcast Channel;報知チャネル)を受信することで、同期の確立も行う。
受信部14により測定された無線品質を示す品質測定結果を、品質測定制御部162は、UL制御情報として送信部12に出力し、基地局装置20に送信する(Sa5、t10)。
このキャリアアグリゲーション通信に用いるコンポーネントキャリアの選択は、例えば、無線品質の良いものから順に選択してもよいし、予め決められた値よりも無線品質が良好なコンポーネントキャリアの中から、割当てられている端末局装置10の数が少ないものから順に選択してもよい。
アンカーキャリア変更要求(不実施)、CC通知(CC-A、B、D)を受け取った端末局装置10は、通知されたコンポーネントキャリアCC-A、B、Dのみでのキャリアアグリゲーションによる下りリンクの通信(受信)を開始出来る状態にする。すなわち、受信部14によるコンポーネントキャリアCC-C、Eの受信は、停止した状態とする。
これにより、CC-A、B、Dでのアグリゲーションによる下りリンクの通信が開始されることになる(Sa8、t14)。
このように、アンカーC/CC判定部264は、DLユーザデータを送信するコンポーネントキャリアとして、CA/早期通信/品質測定判定部262が無線品質の測定を指示したコンポーネントキャリアの一部を決定したときは、該コンポーネントキャリアを、端末局装置10に通知し、端末局装置10の受信部14は、通知されたコンポーネントキャリアのみについて受信を行う。そのため、一部のコンポーネントキャリアのみでキャリアアグリゲーションを行う場合は、端末局装置10の受信部14が備えるRF・フロントエンド部のうち、使用しないコンポーネントキャリアに対応するRF・フロントエンド部を停止しておくことで、消費電力を削減することができる。
図7は、本実施形態における端末局装置10、基地局装置20間の動作シーケンス例Bを示すシーケンス図である。図8は、動作シーケンス例Bにおいて利用されるコンポーネントキャリアのイメージを示す図である。図8において、横軸は時間軸である。また、図8には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
図9は、本実施形態における端末局装置10、基地局装置20間の動作シーケンス例Cを示すシーケンス図である。図10は、動作シーケンス例Cにおいて利用されるコンポーネントキャリアのイメージを示す図である。図10において、横軸は時間軸である。また、図10には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
図11は、本実施形態における端末局装置10、基地局装置20間の動作シーケンス例Dを示すシーケンス図である。図12は、動作シーケンス例Dにおいて利用されるコンポーネントキャリアのイメージを示す図である。図12において、横軸は時間軸である。また、図12には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
また、ここで、無線品質の測定を行うコンポーネントキャリアとの同期が取れていない場合は、同期の確立を行うことになる。
受信部14により測定された無線品質を示す品質測定結果を、品質測定制御部162は、UL制御情報として送信部12に出力し、基地局装置20に送信する(Sd9、t10)。
続いて(または、同時に)、基地局装置20の制御部25は、CN受信部28がコアネットワーク30から受信したDLユーザデータおよびDL制御情報をMS送信部22に出力し、先にアンカーC/CC判定部264が決定したコンポーネントキャリアCC-A、B、Dを用いて送信する。
ここで、端末局装置10において、基地局装置20より通知されたコンポーネントキャリアでの受信が可能な状態になった後に、基地局装置20に対して受信可能である旨を通知し、その後、その通知を受け取った基地局装置20において、下りリンクの送信を開始されるようにしてもよい。
図13は、本実施形態における端末局装置10と基地局装置20との間の動作シーケンス例Eを示すシーケンス図である。図14は、動作シーケンス例Eにおいて利用されるコンポーネントキャリアのイメージを示す図である。図14において、横軸は時間軸である。また、図14には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
ここで、Se4の時点で、DLデータ量、QoSなどの受信、または測定が出来ない場合、DL通信(CC-B)が開始された後(Se6)で、CA判定、早期通信判定、品質測定判定(Se4)と、早期通信要求、品質測定要求の基地局装置から移動局装置への伝送(Se5)を行うようにしてもよい。この場合は、接続中(コネクト状態)の動作シーケンスとなり、早期通信判定と早期通信要求の伝送は行われない。
図15は、本実施形態における端末局装置10と基地局装置20との間の動作シーケンス例Fを示すシーケンス図である。図16は、動作シーケンス例Fにおいて利用されるコンポーネントキャリアのイメージを示す図である。図16において、横軸は時間軸である。また、図16には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
図17は、本実施形態における端末局装置10、基地局装置20間の動作シーケンス例Gを示すシーケンス図である。図18は、動作シーケンス例Gにおいて利用されるコンポーネントキャリアのイメージを示す図である。図18において、横軸は時間軸である。また、図18には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
図19は、本実施形態における端末局装置10、基地局装置20間の動作シーケンス例Hを示すシーケンス図である。図20は、動作シーケンス例Hにおいて利用されるコンポーネントキャリアのイメージを示す図である。図20において、横軸は時間軸である。また、図20には、下りリンク(DL)のコンポーネントキャリアCC-A~Eと、上りリンク(UL)との各々にて送信される情報を示す。符号Uを付した矩形は、ユーザデータが送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CDを付した矩形は、制御情報が送信され、該コンポーネントキャリアの品質測定が行われていることを示す。符号CUを付した矩形は、制御情報が送信されていることを示す。符号Qを付した破線の矩形は、該コンポーネントキャリアの品質測定が行われていることを示す。
但し、上記の様な少量のデータ通信の場合においても、例えば、アンカーキャリアの無線品質が悪い場合などに、コンポーネントキャリアの品質測定を行い、アンカーキャリアの変更を行うようにしてもよい。
上記のシーケンス例では、コンポーネントキャリアの品質測定は、基地局装置20からの指示があった場合に行っているが、これを定期的に実施することにしてもよい。これにより、アグリゲーション通信実施時に、品質測定を行う必要がなくなり、アグリゲーション通信開始の生じる遅れを削減することが出来る。
上記のシーケンス例では、基地局装置20がキャリアアグリゲーション通信の実施、早期通信の実施、品質測定の実施、アンカーキャリアの変更、コンポーネントキャリアの決定を行っていたが、これらを、または、何れかの決定を、端末装置10が決定する形にしてもよい。
さらに、無線品質に応じて符号化率やデータ変調多値数を変更する適応変調を用いている場合は、端末局装置10が測定した無線品質に基づき、適切な符号化率およびデータ変調多値数を選択することができ、通信効率を向上させることができる。
11…送信アンテナ部
12…送信部
13…受信アンテナ部
14…受信部
15…制御部
16…CA制御部
161…CA指示情報取得部
162…品質測定制御部
163…CA通信制御部
20…基地局装置
21…送信アンテナ部
22…MS送信部
23…受信アンテナ部
24…MS受信部
25…制御部
26…CA制御部
27…CN送信部
28…CN受信部
261…DLデータ量/QoS取得部
262…CA/早期通信/品質測定判定部
263…無線品質取得部
264…アンカーC/CC判定部
265…CA通信制御部
30…コアネットワーク
Claims (12)
- 端末局装置と、無線通信を行う通信周波数帯域であるコンポーネントキャリアを複数用いて、前記端末局装置にデータを送信する基地局装置とを備える無線通信システムであって、
前記基地局装置は、
前記端末局装置へのデータの送信を開始するとき、あるいは、前記端末局装置へのデータの送信に用いる前記コンポーネントキャリアを変更するときに、複数の前記コンポーネントキャリア各々の無線品質に基づいて、前記データを送信するコンポーネントキャリアを決定し、前記端末局装置に通知する周波数帯域決定部と、
前記周波数帯域決定部が決定したコンポーネントキャリアを用いて、前記データを送信する送信部と
を具備し、
前記端末局装置は、
前記基地局装置の周波数帯域決定部により通知されたコンポーネントキャリアの信号を受信して、前記基地局装置の送信部が送信したデータを取得する受信部と
を具備する、
無線通信システム。 - 前記基地局装置は、
前記端末局装置へのデータの送信を開始するとき、あるいは、前記端末局装置へのデータの送信に用いる前記コンポーネントキャリアを変更するときに、複数の前記コンポーネントキャリアでの無線品質の測定を前記端末局装置に指示する品質測定指示部と、
を具備し、
前記端末局装置は、
前記品質測定指示部により指示された複数のコンポーネントキャリアでの無線品質を測定して、該無線品質を前記基地局装置に送信する品質測定部と、
を具備し、
前記周波数帯域決定部は、前記データを送信するコンポーネントキャリアの決定を、前記品質測定指示部による指示に対する応答として、前記端末局装置から報告された前記コンポーネントキャリア各々での無線品質に基づいて行う、
請求項1に記載の無線通信システム。 - 前記周波数帯域決定部は、前記無線品質に加えて、前記データの送信に関する要求条件に基づき、前記データを送信するコンポーネントキャリアを決定する、請求項1に記載の無線通信システム。
- 前記データの送信に関する要求条件は、前記データのデータ量、前記データのサービス品質を含む、請求項3に記載の無線通信システム。
- 前記品質測定部は、前記無線品質を測定する際に、前記基地局装置からの信号と同期を取る、請求項2に記載の無線通信システム。
- 前記端末局装置の品質測定部は、前記コンポーネントキャリアのうちの一つであるアンカーキャリアについては、定期的に無線品質を測定し、
前記送信部は、前記端末局装置へのデータの送信を開始する際に、前記品質測定指示部による指示に対する応答として、前記コンポーネントキャリア各々での無線品質を取得する前に、前記アンカーキャリアのみを用いてデータの送信を開始する、
請求項2に記載の無線通信システム。 - 前記品質測定指示部は、前記データの送信に関する要求条件に基づき、前記データの送信にコンポーネントキャリアを複数用いるか否かを判定し、複数用いないと判定したときは、前記端末局装置への無線品質の測定を指示せず、
前記送信部は、前記品質測定指示部が前記データの送信にコンポーネントキャリアを複数用いないと判定したときは、前記アンカーキャリアを用いて、前記データを送信する、
請求項6に記載の無線通信システム。 - 前記周波数帯域決定部は、前記データを送信するコンポーネントキャリアとして、前記品質測定指示部が無線品質の測定を指示したコンポーネントキャリアの一部を決定したときは、該コンポーネントキャリアを、前記端末局装置に通知し、
前記端末局装置の受信部は、前記通知されたコンポーネントキャリアのみについて受信を行い、
前記周波数帯域決定部は、前記端末局装置から報告された無線品質に基づき、前記複数のコンポーネントキャリアの中から1つを選択して前記アンカーキャリアとし、該選択によりアンカーキャリアとするコンポーネントキャリアが変更されたときは、前記コンポーネントキャリアの前記端末局装置への通知とともに、アンカーキャリアとするコンポーネントキャリアを通知する、
請求項6に記載の無線通信システム。 - 前記周波数帯域決定部は、前記データを送信するコンポーネントキャリアとして、前記品質測定指示部が無線品質の測定を指示したコンポーネントキャリアの一部を決定したときは、該コンポーネントキャリアを、前記端末局装置に通知し、
前記端末局装置の受信部は、前記通知されたコンポーネントキャリアのみについて受信を行う、
請求項2に記載の無線通信システム。 - 端末局装置と、無線通信を行う通信周波数帯域であるコンポーネントキャリアを複数用いて、前記端末局装置にデータを送信する基地局装置とを備える無線通信システムにおける無線通信方法であって、
前記基地局装置が、前記端末局装置へのデータの送信を開始するとき、あるいは、前記端末局装置へのデータの送信に用いる前記コンポーネントキャリアを変更するときに、複数の前記コンポーネントキャリア各々の無線品質に基づいて、前記データを送信するコンポーネントキャリアを決定し、前記端末局装置に通知する第1の過程と、
前記基地局装置が、前記第1の過程にて決定したコンポーネントキャリアを用いて、前記データを送信する第2の過程と、
前記端末局装置が、前記第2の過程にて通知されたコンポーネントキャリアの信号を受信して、送信された前記データを取得する第3の過程と
を備える、無線通信方法。 - 無線通信を行う通信周波数帯域であるコンポーネントキャリアを複数用いて、端末局装置にデータを送信する基地局装置であって、
前記端末局装置へのデータの送信を開始するとき、あるいは、前記端末局装置へのデータの送信に用いる前記コンポーネントキャリアを変更するときに、複数の前記コンポーネントキャリア各々の無線品質に基づいて、前記データを送信するコンポーネントキャリアを決定し、前記端末局装置に通知する周波数帯域決定部と、
前記周波数帯域決定部が決定したコンポーネントキャリアを用いて、前記データを送信する送信部と
を具備する、基地局装置。 - 連続する周波数帯域であるコンポーネントキャリアを複数用いて、基地局装置が送信したデータを受信する端末局装置であって、
前記基地局装置が前記端末局装置へのデータの送信を開始するとき、あるいは、前記端末局装置へのデータの送信に用いる前記コンポーネントキャリアを変更するときに、複数の前記コンポーネントキャリアの無線品質に基づき決定したコンポーネントキャリアの信号を受信して、前記基地局装置が送信したデータを受信する受信部を具備する、
端末局装置。
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Also Published As
Publication number | Publication date |
---|---|
EP2439994A1 (en) | 2012-04-11 |
US20120077445A1 (en) | 2012-03-29 |
JPWO2010140347A1 (ja) | 2012-11-15 |
CN102450072A (zh) | 2012-05-09 |
CN102450072B (zh) | 2015-01-28 |
ZA201109029B (en) | 2013-02-27 |
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