WO2012074113A1 - 通信端末、基地局、無線通信システム、これらの制御方法および制御プログラム、並びに、該制御プログラムを記録した記録媒体 - Google Patents
通信端末、基地局、無線通信システム、これらの制御方法および制御プログラム、並びに、該制御プログラムを記録した記録媒体 Download PDFInfo
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- WO2012074113A1 WO2012074113A1 PCT/JP2011/077983 JP2011077983W WO2012074113A1 WO 2012074113 A1 WO2012074113 A1 WO 2012074113A1 JP 2011077983 W JP2011077983 W JP 2011077983W WO 2012074113 A1 WO2012074113 A1 WO 2012074113A1
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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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
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
Definitions
- the present invention relates to a radio communication system in which a communication terminal and a base station perform radio communication using a plurality of frequency bands, a communication terminal and a base station in the radio communication system, a control method and a control program thereof, and the control
- the present invention relates to a recording medium on which a program is recorded.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- Non-Patent Document 1 Carrier Aggregation; CA
- CA Carrier Aggregation
- DL-CC set a downlink (Down Link) -component carrier set
- the DL-CC set is a DL-CC for use in communication specific to a user terminal (UE (User Equipment) specific), and one or more DL-CCs used for communication for each user are determined by the base station. It is specified.
- UE User Equipment
- Communication control such as handover in UL (Uplink) -CC and DL-CC is performed based on the quality (radio propagation quality, communication quality) of the radio propagation path in communication.
- the radio propagation quality is evaluated by monitoring a DL-CC (DL-CC set) used in communication.
- Non-Patent Document 2 in UL-CC transmission power control, a DL-CC (paired with UL-CC) indicated by SIB2 (System Information Block2) in broadcast information is referred to as a path loss reference. It is used as In addition, when the bandwidths of the UL-CC and the DL-CC used as a reference are different, the path loss is greatly different, and it is necessary to correct the path loss.
- SIB2 System Information Block2
- E-UTRA Evolved Universal Terrestrial Radio Access
- communication control such as UL-CC transmission control and handover control is performed using a DL-CC paired with the UL-CC as described above.
- CA technique when the UL data amount is larger than the DL data amount, communication is performed using a larger number of UL-CCs than DL-CCs, and thus there is no UL-CC that has a pair of DL-CCs.
- -It is assumed that CC will be used.
- the frequency band is different from the DL-CC in the DL-CC set, or the base station for communication uses a different UL-CC. In this case, it is not clear which DL-CC is used to calculate the path loss and evaluate the radio propagation quality.
- these UL-CCs are referred to as UL-CConly.
- problems caused by the inability to perform accurate evaluation include, for example, the fact that the communication terminal is away from the base station, so that the radio field intensity that reaches the base station from the communication terminal is weakened, and the base station cannot control the UL-CC. In this case, even if the communication terminal continues uplink transmission, feedback from the base station to the communication terminal cannot be performed, and useless transmission from the communication terminal is continued.
- handover control if there is a DL that is paired with the UL, handover control based on the quality of the DL is possible. However, in UL-CConly, there is no DL-CC as a pair. Therefore, flexible control is not possible.
- the present invention has been made in order to solve the above-described problems, and an object of the present invention is to accurately evaluate the radio propagation quality for UL-CC (UL-CConly) in which there is no DL-CC as a pair.
- An object of the present invention is to provide a wireless communication system that can accurately control uplink transmission using UL-CConly.
- a radio communication system is a radio communication system in which a base station and a communication terminal perform radio communication using a plurality of frequency bands, and in order to solve the above problems,
- Each is a small band for downlink, which is a frequency band used for downlink transmission from the base station to the communication terminal, and a frequency band used for uplink transmission from the communication terminal to the base station.
- An uplink subband, and the base station comprises band allocation means for allocating the downlink subband and the uplink subband to the communication terminal from among the plurality of frequency bands.
- the communication terminal comprises a quality measuring means for measuring the communication quality of the allocated downlink small band allocated by the band allocating means of the base station,
- the base station based on the communication quality of the allocated downlink small band measured by the quality measuring unit of the communication terminal, corresponds to the allocated downlink small band.
- Communication control determining means for determining communication control of the allocated uplink small band allocated by the communication terminal, wherein the communication terminal is configured to determine the allocated uplink small band determined by the communication control determining means of the base station.
- Communication control means for performing the uplink transmission in the allocated uplink small band based on bandwidth communication control, wherein the bandwidth allocation means of the base station transmits the uplink transmission to the communication terminal.
- the quality measuring means of the communication terminal When there is the frequency band to which the small band for the link is allocated but the small band for the downlink is not allocated, the quality measuring means of the communication terminal includes the frequency band. Further, the communication quality of the unassigned downlink small band is measured as the downlink small band for monitoring, and the communication control determining means of the base station is measured by the quality measuring means of the communication terminal. Based on the communication quality of the downlink small band for monitoring, the communication control of the uplink small band in the only state, which is the allocated uplink small band in the frequency band, is determined.
- the control method of the wireless communication system is a wireless communication system in which a base station and a communication terminal perform wireless communication using a plurality of frequency bands, and each of the plurality of frequency bands includes: A downlink small band that is a frequency band used for downlink transmission from the base station to the communication terminal, and an uplink band that is a frequency band used for uplink transmission from the communication terminal to the base station.
- the base station is configured to control the downlink small band and the uplink small band from among the plurality of frequency bands.
- a bandwidth allocation step for allocating the communication terminal to the communication terminal, and the communication terminal allocates a downlink small-band communication product allocated in the bandwidth allocation step.
- the base station corresponds to the allocated downlink small band based on the communication quality of the allocated downlink small band measured in the quality measuring step.
- a communication control determination step for determining communication control of the allocated uplink small band allocated in the band allocation step, and the communication terminal is configured to determine the allocated uplink determined in the communication control determination step.
- a communication control step for performing the uplink transmission in the allocated small bandwidth for uplink based on the small bandwidth communication control.
- the communication terminal When there is a frequency band to which a small band for a link is allocated but a small band for the downlink is not allocated, the quality
- the measuring step further measures the communication quality of the unassigned downlink small band in the frequency band as the downlink small band for monitoring, and the communication control determining step includes the quality measuring step. Determining the communication control of the uplink small band in the only state, which is the allocated uplink small band in the frequency band, based on the communication quality of the monitoring small band for monitoring measured in the above It is said.
- transmission control for performing uplink transmission transmission for stopping the uplink transmission or inactivating the small band for uplink cannot be used. Stop control, resumption of uplink transmission, transmission resumption control for returning to an active state in which a small band for uplink can be used, handover control for changing to uplink transmission to another base station, etc. .
- examples of the communication quality of the downlink small band include a reception level, a propagation loss (path loss), and the like regarding the downlink small band signal.
- the reception level includes a data reception level, a reference signal reception level, and the like.
- the propagation loss can be obtained by the communication terminal receiving information on the transmission power of the signal from the base station and measuring the reception level of the signal.
- the base station allocates a downlink small band and an uplink small band to a communication terminal from among a plurality of frequency bands.
- the communication terminal measures the communication quality of the allocated downlink small band.
- the base station performs communication control of the allocated uplink small band corresponding to the allocated downlink small band based on the measured communication quality of the allocated downlink small band. decide.
- the communication terminal performs uplink transmission in the allocated uplink small band based on the determined allocated uplink small band communication control.
- the communication terminal if the uplink small band is allocated to the communication terminal, but there is the frequency band to which the downlink small band is not allocated, the communication terminal The communication quality of the unassigned downlink small band is further measured as the downlink small band for monitoring. Then, based on the measured communication quality of the downlink small band for monitoring, the base station performs communication control of the uplink small band in the only state that is the allocated uplink small band in the frequency band. To decide.
- the communication quality is measured. It is possible to accurately evaluate the communication quality of the uplink small band in the only state.
- the communication control of the uplink small band in the only state is determined based on the communication quality of the downlink small band for monitoring, the communication terminal is connected with the uplink small band in the only state.
- the uplink transmission can be controlled with high accuracy.
- the base station may allocate a plurality of downlink small bands as a set to the communication terminal. At this time, it is also possible to set downlink small bands having different frequency bands. Similarly, the base station may allocate a plurality of uplink small bands to the communication terminal.
- a radio communication system is a radio communication system in which a base station and a communication terminal perform radio communication using a plurality of frequency bands, and in order to solve the above problems,
- Each is a small band for downlink, which is a frequency band used for downlink transmission from the base station to the communication terminal, and a frequency band used for uplink transmission from the communication terminal to the base station.
- An uplink subband, and the base station comprises band allocation means for allocating the downlink subband and the uplink subband to the communication terminal from among the plurality of frequency bands.
- the communication terminal comprises a quality measuring means for measuring the communication quality of the allocated downlink small band allocated by the band allocating means of the base station,
- the base station based on the communication quality of the allocated downlink small band measured by the quality measuring means of the communication terminal, corresponds to the allocated downlink small band,
- Communication control determining means for determining communication control of the allocated uplink small band assigned by the means, wherein the communication terminal is for the allocated uplink determined by the communication control determining means of the base station
- the base station comprises communication control means for controlling the uplink transmission in the allocated uplink small band based on the small band communication control, and the base station uses the uplink small band reception power.
- a quality measuring means for measuring the communication quality of the uplink small band based on the measured received power, and the bandwidth allocating means of the base station sends the communication terminal to the communication terminal.
- the communication control determining means of the base station determines that the small band for uplink that has already been allocated in the frequency band.
- the uplink small band in the only state which is a band
- communication control of the uplink small band in the only state is determined based on the communication quality obtained by the quality measuring means.
- the control method of the wireless communication system is a wireless communication system in which a base station and a communication terminal perform wireless communication using a plurality of frequency bands, and each of the plurality of frequency bands includes: A downlink small band that is a frequency band used for downlink transmission from the base station to the communication terminal, and an uplink band that is a frequency band used for uplink transmission from the communication terminal to the base station.
- the base station is configured to control the downlink small band and the uplink small band from among the plurality of frequency bands.
- a bandwidth allocation step for allocating the communication terminal to the communication terminal, and the communication terminal allocates a downlink small-band communication product allocated in the bandwidth allocation step.
- the base station corresponds to the allocated downlink small band based on the communication quality of the allocated downlink small band measured in the quality measuring step.
- a communication control determination step for determining communication control of the allocated uplink small band allocated in the band allocation step, and the communication terminal is configured to determine the allocated uplink determined in the communication control determination step.
- the communication control determination step includes the allocation in the frequency band Determining the communication control of the uplink small band in the only state based on the communication quality obtained in the quality measurement step for the uplink small band in the only state that is the small band for the uplink. It is characterized by.
- the base station allocates a downlink small band and an uplink small band to a communication terminal from among a plurality of frequency bands.
- the communication terminal measures the communication quality of the allocated downlink small band.
- the base station performs communication control of the allocated uplink small band corresponding to the allocated downlink small band based on the measured communication quality of the allocated downlink small band. decide.
- the communication terminal performs uplink transmission in the allocated uplink small band based on the determined allocated uplink small band communication control.
- the base station determines the communication control of the said small band for uplinks based on the calculated
- the base station can directly evaluate the communication quality of the uplink small band for uplink (UL-CConly), it can be evaluated with high accuracy.
- the communication control of the uplink small band in the only state is determined based on the communication quality of the uplink small band in the only state, the communication terminal uses the uplink small band in the only state.
- the uplink transmission can be controlled with high accuracy.
- a radio communication system is a radio communication system in which a base station and a communication terminal perform radio communication using a plurality of frequency bands, and in order to solve the above problems,
- Each is a small band for downlink, which is a frequency band used for downlink transmission from the base station to the communication terminal, and a frequency band used for uplink transmission from the communication terminal to the base station.
- An uplink subband, and the base station comprises band allocation means for allocating the downlink subband and the uplink subband to the communication terminal from among the plurality of frequency bands.
- the communication terminal comprises a quality measuring means for measuring the communication quality of the allocated downlink small band allocated by the band allocating means of the base station,
- the base station based on the communication quality of the allocated downlink small band measured by the quality measuring means of the communication terminal, corresponds to the allocated downlink small band,
- Communication control determining means for determining communication control of the allocated uplink small band assigned by the means, wherein the communication terminal is for the allocated uplink determined by the communication control determining means of the base station
- the communication terminal is for the allocated uplink determined by the communication control determining means of the base station Based on the communication control of the small band, it comprises a communication control means for controlling the uplink transmission in the allocated small band for uplink, the band allocation means of the base station, for the communication terminal,
- the band allocation unit of the base station The subband for the downlink at a wave number band, as a small band for the downlink for measuring the communication quality, is characterized in that allocated to the communication terminal.
- the base station control method is a radio communication system in which a base station and a communication terminal perform radio communication using a plurality of frequency bands, and each of the plurality of frequency bands includes the A small downlink band that is a frequency band used for downlink transmission from a base station to the communication terminal, and a small uplink band that is a frequency band used for uplink transmission from the communication terminal to the base station.
- the base station determines the downlink small band and the uplink small band from the plurality of frequency bands.
- a bandwidth allocation step allocated to the communication terminal, and the communication terminal measures the communication quality of the allocated downlink small band allocated in the bandwidth allocation step.
- the base station based on the communication quality of the allocated downlink small band measured in the quality measurement step, the band allocation corresponding to the allocated downlink small band
- a communication control determining step for determining communication control of the allocated uplink small band allocated in step, and the communication terminal is configured to determine the allocated uplink small band determined in the communication control determining step.
- Communication control step of controlling the uplink transmission in the allocated uplink small band based on the communication control of the communication terminal, and in the band allocation step, for the communication terminal If there is a frequency band that needs to be allocated a small band but does not need to allocate the downlink small band, the band allocation Step is, the small band for the downlink in the frequency band, as a small band for the downlink for measuring the communication quality, is characterized in that allocated to the communication terminal.
- the base station allocates a downlink small band and an uplink small band to a communication terminal from among a plurality of frequency bands.
- the communication terminal measures the communication quality of the allocated downlink small band.
- the base station performs communication control of the allocated uplink small band corresponding to the allocated downlink small band based on the measured communication quality of the allocated downlink small band. decide.
- the communication terminal performs uplink transmission in the allocated uplink small band based on the determined allocated uplink small band communication control.
- the base station The downlink small band is allocated to the communication terminal as a downlink small band for measuring the communication quality.
- the frequency band including the allocated uplink small band always includes the downlink small band whose communication quality is measured, and the above-described only uplink small band is included. No longer exists.
- the base station can accurately evaluate the communication quality of the allocated uplink small band, and the communication terminal accurately controls uplink transmission in the uplink small band. be able to.
- the communication quality is improved by using the unassigned downlink subband included in the same frequency band as the uplink uplink subband as a monitoring downlink subband.
- the communication quality of the uplink small band in the only state it is possible to accurately evaluate the communication quality of the uplink small band in the only state, and as a result, it is possible to accurately control the uplink transmission in the uplink small band in the only state.
- the radio communication system measures the received power for the uplink small band in which the base station is in the online state, and directly determines the communication quality from the measured received power. As a result, it is possible to accurately control uplink transmission in the uplink small band in the only state.
- the radio communication system further allocates an unassigned downlink small band in a frequency band including the only uplink small band to the communication terminal. As a result, there is no small band, and as a result, it is possible to prevent a decrease in the accuracy of communication control regarding the uplink small band in the only state.
- FIG. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present invention. It is a block diagram which shows schematic structure of the said radio
- FIG. 6 is a sequence diagram showing an example of operations of the terminal and the base station in UL-CConly transmission control with respect to the wireless communication system.
- FIG. 10 is a sequence diagram illustrating another example of operations of the terminal and the base station in the UL-CConly transmission control. It is a flowchart which shows the flow of a quality measurement process corresponding to UL-CConly in the said transmission control.
- FIG. 6 is a sequence diagram showing an example of operations of the terminal and the base station in UL-CConly handover control for the wireless communication system.
- 7 is a flowchart showing a flow of quality measurement processing compatible with UL-CConly in the handover control.
- FIG. 11 is a sequence diagram showing another example of operations of the terminal and the base station in the UL-CConly handover control.
- FIG. 7 is a flowchart showing a flow of quality measurement processing compatible with UL-CConly in the handover control.
- FIG. 10 is a sequence diagram illustrating another example of operations of the terminal and the base station in the UL-CConly handover control. It is a flowchart which shows an example of the process which changes the threshold value for determining whether the said handover is performed.
- wireless communications system it is a schematic diagram which shows the case where it becomes UL-CConly during communication. It is a sequence diagram which shows an example of operation
- FIG. 6 is a sequence diagram showing an example of operations of the terminal and the base station in UL-CConly transmission control with respect to the wireless communication system. It is a flowchart which shows the flow of the terminal side process of the quality measurement corresponding to UL-CConly in the transmission control of said UL-CConly. It is a flowchart which shows the flow of the base station side process of the quality measurement corresponding to said UL-CConly.
- FIG. 6 is a sequence diagram showing an example of operations of the terminal and the base station in UL-CConly handover control for the wireless communication system.
- FIG. 7 is a flowchart showing a flow of terminal-side processing of quality measurement corresponding to UL-CConly in the UL-CConly handover control. It is a schematic diagram of the radio
- FIG. 1 is a schematic diagram of a wireless communication system according to the present embodiment.
- a wireless communication system 10 includes a wireless communication terminal (hereinafter abbreviated as “terminal”) 11 and base stations 12A to 12C that perform wireless communication with the wireless communication terminal 11. is there.
- the base stations 12A to 12C are collectively referred to as “base station 12”.
- bands two frequency bands (hereinafter abbreviated as “bands”) FB1 and FB2 are used for the wireless communication.
- the base station 12A uses the bands FB1 and FB2
- the base station 12B uses the band FB1
- the base station 12C uses the bands FB1 and FB2.
- FIG. 1 also shows cells 13A1 and 13A2, which are areas in which the base station 12A can communicate in the bands FB1 and FB2, respectively, and a cell 13B1 in which the base station 12B can communicate in the band FB1.
- Cells 13C1 and 13C2, which are areas in which the base station 12C can communicate with each other in the bands FB1 and FB2, are shown.
- the cells 13A1, 13A2, 13B1, 13C1, and 13C2 are collectively referred to as “cell 13”.
- the base station 12A transmits to the terminal 11 using a plurality of DL-CCs (downlink small bands) in the bands FB1 and FB2, while the terminal 11 transmits the band FB1 and the band to the base station 12A. Transmission is performed using a plurality of UL-CCs (uplink small bands) with the FB2. The same applies to the base station 12C.
- the base station 12B transmits to the terminal 11 using a plurality of DL-CCs in the band FB1, while the terminal 11 transmits to the base station 12B using a plurality of UL-CCs in the band FB1. ing.
- Bands FB1 and FB2 are frequency bands allocated by the country for the mobile communication system. For example, in the case of Japan, the 2 GHz band (of which UL is 1920 MHz to 1980 MHz and DL is 2110 MHz to 2170 MHz) 800 MHz band (of which UL is 824 MHz to 849 MHz and DL is 869 MHz to 894 MHz). Other communication methods may be used.
- a terminal 11 that performs communication with a UL data amount larger than a DL data amount moves from point a to point b, and communication by CC in the band FB1 is performed.
- a state in which handover is performed from the base station 12A to the base station 12B is shown.
- the terminal 11 transmits one DL-CC (DL-CC21) in the band FB2 of the base station 12A with respect to DL and UL-CC (UL-CC) in the band FB2 of the base station 12A with respect to UL.
- CC21) and the UL-CC (UL-CC11) of the band FB1 of the base station 12A are used for communication. That is, the DL-CC set is only DL-CC21, and there are two UL-CC sets, UL-CC21 and UL-CC11.
- the UL-CC 11 there is only one UL-CC 11 as the CC in the band FB1.
- the UL-CC exists in a band in which no DL-CC exists in the DL-CC set.
- the radio propagation characteristics are different between the band FB1 and the band FB2
- the UL-CC when there is a UL-CC whose radio propagation characteristics (bandwidth) are different from all DL-CCs in the DL-CC set, the UL-CC is referred to as UL-CConly (uplink-only state small uplink link). Band). Even in the case of UL-CC in which cells (base stations 12) are different from all DL-CCs in the DL-CC set, the quality is different, so that UL-CConly is obtained as in the case of different bands.
- transmission control similar to all UL-CConly transmission control described later is performed for the UL-CC in which the monitoring DL-CC is instructed from the base station 12. It is possible.
- the transmission control of the UL-CC 21 is performed based on the quality of the DL-CC 21 in the same band FB2 as usual.
- UL-CC11 is UL-CConly
- the quality of UL-CConly is ensured by monitoring the DL-CC corresponding to UL-CC11, and transmission control of UL-CC11 is performed with high accuracy.
- an arrow indicated by a broken line indicates a monitoring DL-CC.
- the UL-CC 11 and the DL-CC are associated with each other by, for example, associating the DL-CC and UL-CC (cell-specific linkage) predetermined in the radio communication system 10 (notified by broadcast information). May be used. Further, when the association (UE Specific Linkage) between the terminal-specific DL-CC and UL-CC is notified via the communication network, the association may be used. In this case, the terminal-specific association (UE Specific Linkage) needs to be configured in the same cell and in the same band.
- any DL-CC can be used in the same cell and in the same band as the UL-CConly. You may match with CC.
- the base station 12 selects and notifies the terminal 11 of the association.
- the terminal 11 moves from point a to point b.
- the quality level of the DL-CC (band FB1) corresponding to the UL-CC11 of the monitored base station 12A decreases
- the DL-CC (band FB1) corresponding to the UL-CC11 of the base station 12B decreases.
- the quality level of will rise.
- the UL-CC 11 is handed over from the base station 12A to the base station 12B. Note that the timing at which the terminal 11 monitors the handover may be performed based on an instruction from the base station 12, or may be performed periodically or constantly.
- the handover of the UL-CC 11 is performed according to a handover instruction from the base station 12.
- parameters for handover such as transmission signal settings for the base station 12B
- the terminal 11 performs the handover by setting the parameters.
- UL-CConly is only switched from the base station 12A to the base station 12B on the communication network side.
- the DL-CC in the DL-CC set with different qualities is not used, and the DL-CC in the same cell and the same band with almost the same quality is monitored. Therefore, it is possible to perform UL-CConly transmission control with high accuracy.
- a detailed configuration and control method will be described.
- FIG. 2 is a block diagram showing a schematic configuration of the wireless communication system 10 of the present embodiment.
- FIG. 2 shows a case where the terminal 11 is located at the point b in FIG.
- the left side of FIG. 2 shows the configuration of the base station 12 and the core network device 14, and the right side shows the configuration of the terminal 11.
- the terminal 11 includes a plurality of reception antennas 20 that receive signals from the base station 12, a plurality of reception units 21 that demodulate received reception signals, and transmission data to be transmitted to the base station 12.
- the configuration includes a plurality of transmitters 22 that modulate, a plurality of transmission antennas 23 that transmit modulated transmission data, and a controller 24 that controls the entire terminal 11.
- the terminal 11 generally incorporates various functions in addition to a display unit and an operation unit serving as an input / output interface to the user.
- the receiving unit 21 of the terminal 11 is configured to receive two CCs in each of the band FB1 and the band FB2.
- the receiving unit 21 converts the received RF signal into a baseband signal, performs predetermined signal processing for data demodulation, acquires demodulated data for each CC, and sends it to the control unit 24.
- the receiving unit 21 may be mounted so that two CCs within a certain band are received by different receiving devices, or is mounted so as to be received by one receiving device. May be.
- the transmission unit 22 of the terminal 11 is configured to transmit two CCs in each of the band FB1 and the band FB2.
- the transmission unit 22 performs predetermined signal processing for data modulation on the transmission data for each CC received from the control unit 24, converts the baseband signal after the signal processing into an RF signal, and performs transmission.
- the transmission unit 22 may be implemented so as to transmit two CCs in a certain band with different transmission devices, or with one transmission device. May be.
- the control unit 24 of the terminal 11 performs various controls related to communication of the terminal 11 such as processing of received data and transmission data, and control of the carrier frequency of each of the transmission / reception units 21 and 22. Details of the control unit 24 will be described later.
- the base station 12 includes a plurality of reception antennas 30 that receive signals from the terminal 11, a plurality of reception units 31 that demodulate received reception signals, and transmission data that is transmitted to the terminal 11.
- Is configured to include a plurality of transmission units 32 that modulate the transmission data, a plurality of transmission antennas 33 that transmit the modulated transmission data, and a control unit 34 that controls the entire base station 12.
- the receiving part 31, the transmission part 32, and the control part 34 of the base station 12 are the same as the receiving part 21, the transmission part 22, and the control part 24 of the terminal 11, the description is abbreviate
- each base station 12 is connected to a core network device 14.
- the core network device 14 supervises position control, call control, service control and the like related to wireless communication between the base station 12 and the terminal 11.
- the core network device 14 is connected to the external Internet.
- FIG. 3 is a block diagram illustrating a schematic configuration of the terminal 11.
- the control unit 24 of the terminal 11 includes a packet communication request unit 25, a quality measurement unit (quality measurement unit) 26, and a communication control unit (communication control unit) 27.
- the packet communication request unit 25 requests packet communication with the base station 12. Specifically, when a packet transmission request such as upload occurs or a packet reception request such as download occurs due to a user operation or the like, the packet communication request unit 25 sends a packet connection request to the transmission unit 22. To the base station 12. At this time, the packet communication request unit 25 may include the purpose of packet connection such as upload or download in the request for packet connection.
- the quality measuring unit 26 measures the communication quality of DL-CC. Specifically, when the quality measurement unit 26 receives a quality measurement request from the base station 12 via the reception unit 21, the quality measurement unit 26 measures the communication quality of each DL-CC included in the request. In the present embodiment, the quality measurement unit 26 measures the communication quality of the set of DL-CC assigned by the base station 12 and, if UL-CConly exists, further, DL-CC corresponding to UL-CConly. Is measuring the communication quality. The quality measuring unit 26 notifies the measured quality level of each DL-CC to the base station 12 via the transmitting unit 22.
- Examples of DL-CC communication quality include reception level, propagation loss (path loss), and the like related to the DL-CC signal. Further, the reception level includes a data reception level, a reference signal reception level, and the like. Further, the propagation loss can be obtained by the terminal 11 receiving the transmission power information regarding the DL-CC signal from the base station 12 via the receiving unit 21 and measuring the reception level of the signal. .
- the communication control unit 27 controls the reception unit 21 and the transmission unit 22. Specifically, the communication control unit 27 uses the DL-CC (allocated DL-CC) and UL-CC (allocated UL-CC) information assigned to the terminal 11 by the base station 12 as base station information. Received from the station 12 via the receiver 21. Then, the communication control unit 27 controls the reception unit 21 and the transmission unit 22 to receive data using the DL-CC set and transmit data using the UL-CC set. . In addition, the communication control unit 27 receives the communication control information determined by the base station 12 from the base station 12 via the reception unit 21, and receives data from the reception unit 21 based on the received communication control information. The data transmission of the transmission unit 22 is controlled.
- DL-CC allocated DL-CC
- UL-CC allocated UL-CC
- FIG. 4 is a block diagram showing a schematic configuration of the base station 12.
- the control unit 34 of the base station 12 includes a CA candidate determination unit 35, a CA set determination unit (set allocation unit) 36, and a communication control unit (communication control determination unit) 37.
- the CA candidate determining unit 35 determines a CA candidate for performing CA connection in accordance with the received request.
- the CA candidate determination unit 35 requests the terminal 11 to measure the quality of a plurality of DL-CCs included in the determined CA candidate via the transmission unit 32.
- the CA set determination unit 36 When the CA set determination unit 36 receives the measurement result of the DL-CC quality measurement requested by the CA candidate determination unit 35 from the terminal 11 via the reception unit 31, the CA set determination unit 36 performs CA connection based on the received measurement result.
- the CA set is determined.
- the CA set determination unit 36 transmits information on the determined CA set to the communication control unit 37 and also transmits to the terminal 11 via the transmission unit 32.
- the communication control unit 37 controls the reception unit 31 and the transmission unit 32 to communicate with the terminal 11 based on the CA set information from the CA set determination unit 36. Further, in the present embodiment, when the communication control unit 37 receives the DL-CC quality level measured by the terminal 11 from the terminal 11 via the reception unit 31, the communication control unit 37 includes the received quality level in the CA set. Determine the communication control of the set of UL-CCs to be used. The communication control unit 37 transmits the determined communication control information to the terminal 11 via the transmission unit 32.
- Examples of UL-CC communication control include transmission control for performing uplink transmission, transmission stop control for stopping uplink transmission, and inactive state in which UL-CC cannot be used, and uplink transmission. For example, transmission resume control for resuming or returning to an active state where UL-CC can be used, handover control for changing to uplink transmission to another base station 12, and the like can be mentioned.
- FIG. 5 is a sequence diagram illustrating an example of operations of the terminal 11 and the base station 12 in CA connection.
- the example of FIG. 5 shows a case where UL-CConly is also specified at the time of CA connection. 5 will be described with reference to FIG. 1 and FIG.
- the terminal 11 is in a standby state (T10). For example, it is assumed that camping is performed on the DL-CC 21 in the band FB2. Then, for example, it is assumed that a packet transmission request such as upload is generated in the terminal 11 by a user operation (T11).
- the terminal 11 connects to the base station 12A using the UL-CC 21 corresponding to the DL-CC 21 that is currently camping on.
- the UL-CC 21 corresponding to the DL-CC 21 is notified in advance using broadcast information.
- the terminal 11 transmits a packet connection request including uploading to the base station 12A using the UL-CC 21 (T12).
- the base station 12A determines a CA candidate for performing a CA connection in response to the packet connection request (T13).
- the packet connection request includes uploading (communication using more UL-CCs than DL-CCs)
- the base station 12A indicates that CA connection is to be performed.
- CC candidates that can be used for CA are determined, and the quality measurement request for the determined CC is transmitted to the terminal 11 using the DL-CC 21 (T14).
- uploading for example, a CC with a small UL-CC communication traffic volume may be selected as the CA candidate.
- the packet connection request is a request for voice telephone or a small amount of data communication
- the base station 12A determines that the CA connection is not performed, and performs communication using the currently connected CC.
- Step T17 more UL-CCs are selected than DL-CCs, and UL-CConly (UL-CC11) is selected in the UL-CC set.
- the base station 12A sends the CA set (DL-CC set (DL-CC21) and UL-CC set (UL-CC21 / UL-CC11)) determined in step T17 to the terminal 11 and DL-CC21.
- the DL-CC (DL-CC11) for ensuring (monitoring) the quality of the selected UL-CConly (UL-CC11) is selected in step T18.
- the parameters necessary for the terminal 11 to receive the designated monitoring DL-CC and ensure the quality for example, the cell ID of the base station 12 transmitting the corresponding CC, the base station 12 The transmission level etc. are also notified.
- the base station 12 selects a DL-CC that is pre-associated with UL-CConly in the wireless communication system 10. In this method, the association (Cell Specific Linkage) between DL-CC and UL-CC notified by broadcast information is used.
- the second method is to select a DL-CC that is determined in advance by the base station 12 for monitoring.
- the base station 12 may select a DL-CC that is closest to the UL-CC band portion from DL-CCs in the same cell and in the same band.
- a DL-CC that can be used by all the base stations 12 can be selected.
- the base station 12 selects a DL-CC having the largest communication traffic amount from DL-CCs in the same cell and in the same band.
- the terminal 11 Upon receiving the CA set notification, the terminal 11 starts monitoring the DL-CC (DL-CC11) designated for monitoring by the base station 12 because UL-CConly is included (T19). Details of the monitoring will be described later. Thereafter, the packet communication connection using the designated CC becomes possible.
- the initial transmission power value may be determined based on the quality level of DL-CC corresponding to UL-CConly. However, if there is an instruction of the initial transmission power value at the time of connection from the base station 12, it goes without saying that control according to the instruction is performed.
- Data transmission starts after packet connection is completed. Data transmission is performed using UL-CC21 and UL-CC11 (UL-CConly).
- a control signal such as ACK / NACK for the transmission data of the terminal 11 is transmitted from the base station 12 using the DL-CC 21.
- the control signal such as ACK / NACK for the reception data is not the UL-CC only but the terminal 11 using the UL-CC 21.
- Sent from The DL-CC 11 is a UL-CC only quality monitoring CC as described above, and is not included in the communication DL-CC set, and thus is not used for communication of data, control signals, and the like.
- FIG. 6 is a flowchart showing a flow of CA set determination processing (T17) shown in FIG.
- the base station 12A acquires the quality level of each DL-CC of each base station 12 notified from the terminal 11 (S10).
- the DL-CC set number Nd and the UL-CC set number Nu are determined based on the requested communication amount, the communication traffic amount of the base station 12, and the like (S11).
- Nd DL-CCs are selected in order from the DL-CC having the highest quality level (S12). Thereby, the DL-CC set is determined.
- step S12 if the quality level of the selected DL-CC is inferior, control for removing the DL-CC from the DL-CC set may be added. In this case, the DL-CC set is smaller than Nd.
- the base station 12A selects Nu UL-CCs in order from the UL-CC corresponding to the DL-CC having a high quality level (S13). Thereby, the UL-CC set is determined.
- the CA set is determined as described above.
- step S13 if the quality level of the selected DL-CC is poor, the UL-CC corresponding to the DL-CC is removed from the UL-CC set as in the case of the DL-CC set. Such control may be added. In this case, the UL-CC set is smaller than Nu.
- the CA set is determined after the number of DL-CC sets and UL-CC sets is determined first. However, depending on the quality level, the number of DL-CC sets or UL-CC sets is determined. It is also possible to add control for determining the CA set again after the change.
- FIG. 7 is a sequence diagram illustrating an example of operations of the terminal 11 and the base station 12 in UL-CConly transmission control.
- the example of FIG. 7 is an example when the amount of UL communication is large as shown in FIG. 5, and packet communication is performed using a UL-CC set including UL-CConly.
- FIG. 7 is a flowchart showing the flow of UL-CConly compatible quality measurement processing.
- the terminal 11 acquires the quality of each DL-CC of the DL-CC set that is currently communicating (S20).
- the quality may be measured according to an existing method.
- the terminal 11 determines the quality of each DL-CC (DL-CC21) of the acquired DL-CC set and the DL-CC (DL-DL) corresponding to the UL-CConly (UL-CC11). -The quality of CC11) is notified to the base station 12A using the UL-CC21 (T21).
- the terminal 11 may perform the above-described quality measurement corresponding to UL-CConly (T20 in FIG. 7 and FIG. 8) periodically or based on an instruction from the base station 12A.
- a sequence of quality measurement requests from the base station 12A is added before step T20 in FIG.
- FIGS. 5 and 6 all UL-CCs in the UL-CC set are described, but the control may be changed to a control specialized for UL-CConly.
- FIG. 9 is a sequence diagram showing another example of operations of the terminal 11 and the base station 12 in UL-CConly transmission control.
- the quality of UL-CConly is managed by periodically monitoring DL-CC corresponding to UL-CConly or monitoring based on an instruction from the base station 12.
- the quality of UL-CConly is managed by always synchronizing the DL-CC corresponding to UL-CConly. For example, an operation is performed to always maintain synchronization (L1 synchronization) in the physical layer by demodulating reference signals (known signals) of the entire DL-CC band or a part of the band.
- L1 synchronization L1 synchronization
- the terminal 11 is made to use UL-CConly by another method.
- DL-CC L1 synchronization corresponding to the UL-CC set is started.
- OFDMA Orthogonal Frequency Division Multiple Access
- frequency and time are each divided into a plurality of regions, and data for a plurality of terminals 11 is arranged and transmitted in the divided frequency-time regions.
- known signals pilot signals
- This known signal is called a reference signal.
- the reference signal is used for channel (radio propagation path) estimation, quality measurement, monitoring of neighboring cells, etc., but is also used for synchronization between the terminal 11 and the base station 12 because it is transmitted in a predetermined cycle. be able to.
- the reference signal is subjected to cell-dependent modulation. Therefore, the terminal 11 can identify the reference signal of the same cell as the UL-CConly by demodulating a plurality of reference signals transmitted in the same band as the UL-CConly in the physical layer, and uses the identified reference signal. By doing so, the above-mentioned synchronization in the physical layer becomes possible.
- the UL-CConly transmission control shown in FIG. 9 is different from the UL-CConly transmission control shown in FIG. 7 in the quality measurement processing corresponding to the UL-CConly in the terminal 11, and the base station 12A is connected to the UL-CConly.
- the operation of the terminal 11 and the base station 12 when the transmission stop is determined is added, and the other processes and operations are the same.
- symbol is attached
- FIG. 10 is a flowchart showing a processing flow of quality measurement (T30) corresponding to UL-CConly in FIG. Compared with the process shown in FIG. 8, the process shown in FIG. 10 obtains the above quality by measuring each DL-CC during L1 synchronization when UL-CConly exists (YES in S21). (S32) The point is different and other processes are the same.
- the base station 12A determines the UL-CConly (UL-CC11) transmission stop control based on the quality notified in step T21 (T32)
- the base station 12A determines that the determined UL-CConly Is notified to the terminal 11 using the DL-CC 21 (T33).
- the notified terminal 11 stops transmission of UL-CConly (T34).
- the monitoring may not be stopped immediately, but may be stopped after continuing for a predetermined period.
- the quality of the DL-CC 11 monitored within the predetermined period is improved, it is possible to perform UL-CConly transmission again.
- the initial power value at the time of resuming transmission the power value at the time of stopping the connection may be used, or the radio channel loss is calculated from the quality of DL-CC 11 and the initial power value is calculated based on the result. May be determined.
- 9 and 10 show all UL-CCs included in the UL-CC set. However, the control may be changed to a control specialized for UL-CConly.
- the DL-CC quality measurement corresponding to UL-CConly also uses the reference signal in the same manner. The process can be almost equivalent to quality measurement.
- FIG. 11 is a sequence diagram illustrating an example of operations of the terminal 11 and the base stations 12A and 12B in UL-CConly handover control according to this embodiment.
- the example of FIG. 11 is an example when the terminal 11 moves from the point a to the point b in FIG. 1, and is an example when the UL traffic is large as shown in FIGS. 5 and 6.
- the terminal 11 performs packet communication using a UL-CC set including UL-CConly.
- FIG. 12 is a flowchart showing the flow of UL-CConly compatible quality measurement processing.
- the terminal 11 acquires the quality of each DL-CC of the DL-CC set currently in communication (S40).
- the quality may be measured according to an existing method.
- each DL-CC related to another cell base station 12B
- the above process ends.
- the terminal 11 determines the quality of each DL-CC (DL-CC21) of the acquired DL-CC set and the quality of the DL-CC (DL-CC11) corresponding to UL-CConly. Then, the base station 12A is notified of the DL-CC quality for other cells using the UL-CC 21 (T41). At this time, the quality of UL-CC11 is also notified using UL-CC21.
- the base station 12A determines handover control based on the notified quality (T42).
- the quality level of the DL-CC (DL-CC11) corresponding to the UL-CConly (UL-CC11) of the base station 12B is the DL-CC corresponding to the UL-CConly (UL-CC11) of the base station 12A. It is sufficiently larger than the quality level of CC (DL-CC11).
- the base station 12A determines to perform handover control from the base station 12A to the base station 12B for UL-CConly (UL-CC11).
- the base station 12A notifies the terminal 11 of the handover parameters for handing over UL-CConly from the base station 12A to the base station 12B using the DL-CC 21 (T43).
- the base station 12A notifies the base station 12B that the UL-CConly (UL-CC11) is handed over from the base station 12A to the base station 12B using the core network device 14 (T44).
- the terminal 11 performs handover from the base station 12A only to UL-CConly (UL-CC11) to the base station 12B (T45).
- the terminal 11 may perform the above-described quality measurement corresponding to UL-CConly (T40 in FIG. 11, FIG. 12) periodically or based on an instruction from the base station 12A.
- a sequence of quality measurement requests from the base station 12 is added before step T40 in FIG.
- the UL-CConly handover control shown in FIG. 13 differs from the UL-CConly handover control shown in FIG. 11 in the quality measurement process corresponding to the UL-CConly in the terminal 11, and the other processes and operations are the same. .
- symbol is attached
- FIG. 14 is a flowchart showing a processing flow of quality measurement (T50) corresponding to UL-CConly in FIG. Compared with the process (T40) shown in FIG. 12, the process (T50) shown in FIG. 14 is performed by measuring each DL-CC during L1 synchronization when UL-CConly exists (YES in S41). The quality is acquired (S52), and the other processes are the same.
- the DL-CC quality measurement corresponding to UL-CConly also uses the reference signal in the same manner. The process can be almost equivalent to quality measurement.
- FIG. 15 is a sequence diagram showing another example of operations of the terminal 11 and the base stations 12A and B in UL-CConly handover control.
- the base station 12 obtains the quality level of each DL-CC of the neighboring cell from the terminal 11 and compares the quality level to determine the handover.
- the terminal 11 compares the quality level measured by the terminal 11 itself, so that the handover event (quality information) for the DL-CC whose quality level has deteriorated compared to other cells.
- the base station 12 makes a handover determination.
- the terminal 11 performs packet communication using a UL-CC set including UL-CConly.
- the base station 12 transmits a quality measurement request to the terminal 11 using the DL-CC 21 (T60).
- the terminal 11 performs DL-CC (DL-CC21) in communication, DL-CC (DL-CC11) corresponding to UL-CConly (UL-CC11), and other cells
- the quality level with the DL-CC is measured (T61).
- the quality level can be measured by the same process as in FIG.
- the terminal 11 compares the acquired DL-CC (DL-CC21, DL-CC11) of its own cell (base station 12A) with the DL-CC quality level of the other cell (base station 12B). (T62). At this time, if the DL-CC quality level of the own cell is deteriorated compared to the DL-CC quality level of the other cell, the base station uses the UL-CC 21 as a handover event (quality information). 12 (T63). In the example of FIG. 15, it is determined that the quality level of the monitored DL-CC 11 is deteriorated compared to other cells, and a handover event for the DL-CC 11 (UL-CC only) is reported.
- the base station 12 determines handover control based on the content of the handover event received from the terminal 11 and the communication traffic amount of the cell (T64).
- the base station 12A determines the UL-CConly handover control, and uses the DL-CC21 to send the handover parameters for handing over the UL-CConly from the base station 12A to the base station 12B to the terminal 11. Notification is made (T65).
- the base station 12A notifies the base station 12B that the UL-CConly (UL-CC11) is handed over from the base station 12A to the base station 12B using the core network device 14 (T66).
- the terminal 11 performs handover from the base station 12A only to UL-CConly (UL-CC11) to the base station 12B in accordance with the notified handover parameter (T67).
- the above-described quality measurement corresponding to UL-CConly (T61 in FIG. 15) is performed by receiving a quality measurement request from the base station 12, it may be performed periodically.
- the quality level of each DL-CC in the DL-CC set of each desired base station 12 and the DL-CC corresponding to UL-CConly is used, so that an accurate handover can be performed. Control becomes possible.
- FIG. 16 shows how to change the threshold for determining whether to perform handover using the quality level of each DL-CC in the DL-CC set and the quality level of DL-CC corresponding to UL-CConly. It is a flowchart which shows an example of the process to perform.
- the example of FIG. 16 is an example of processing (T42 in FIGS. 11 and 13) in which the base station 12 determines the quality level.
- the base station 12A acquires the quality of each DL-CC received from the terminal 11 (S60), and sets an initial value (S61).
- Each acquired DL-CC includes a DL-CC corresponding to UL-CConly.
- the base station 12A determines that the DL-CC quality level is not the DL-CC quality level corresponding to UL-CConly, and the DL-CC quality level is the same.
- the handover control of the DL-CC is determined (S62, S63, S65).
- the base station 12A for any one of the acquired DL-CCs, the DL-CC quality level is the DL-CC quality level corresponding to UL-CConly, and the DL-CC quality level
- the handover control of the DL-CC is determined (S62, S64, S65).
- the threshold value ⁇ is larger than the threshold value ⁇ . Then, the above process is executed for all acquired DL-CCs, and then the process ends.
- the DL-CC for which handover control is determined and the UL-CC associated with the DL-CC are handed over.
- DL-CC handover control corresponding to UL-CConly is determined, only UL-CConly is handed over.
- handover control for a plurality of DL-CCs may be determined. In this case, a plurality of handovers are performed.
- the DL-CC quality measurement accuracy corresponding to the UL-CConly is not good, that is, when the variation is large. Suppressing erroneous handover control.
- the threshold value is changed depending on whether the DL-CC quality level is the DL-CC quality level corresponding to UL-CConly, but the DL-CC quality level accuracy is assumed.
- the threshold value may be changed according to the above. For example, even a DL-CC in a DL-CC set may not be in communication if the DL-CC is not activated, and is active for such a DL-CC quality level.
- the threshold value may be set larger than that of the DL-CC.
- the DL-CC which is not activated is a DL-CC which is not likely to be assigned as received data of the terminal 11 even in the DL-CC set. Such a DL-CC normally performs power saving.
- the activated DL-CC is a DL-CC that may be assigned as reception data of the terminal 11, and is a DL-CC that is continuously received.
- the base station 12 determines the quality level.
- the terminal 11 determines the quality level (FIG. 15)
- the communication is performed with the DL-CC corresponding to UL-CConly. It is possible to set different thresholds for determining the quality level for the DL-CC used in the above.
- FIG. 17 is a schematic diagram showing a case where UL-CConly occurs during communication in the wireless communication system 10 of the present embodiment.
- FIG. 17A as in the case of FIG. 1, communication is performed using two UL-CCs (UL-CC21 and UL-CC22) and one DL-CC (DL-CC21). Yes.
- FIG. 17A since communication is performed using only the CC of band FB2, UL-CConly does not exist.
- the controlled terminal 11 changes one UL-CC (UL-CC22) communicating with the base station 12A to the UL-CC (UL-CC11) of the band FB1. Hand over (change).
- the UL-CC of the band FB1 becomes UL-CConly, the quality is ensured by monitoring or always synchronizing the DL-CC corresponding to the UL-CConly as described above.
- FIG. 18 is a sequence diagram showing an example of the operation of the terminal 11 and the base station 12A when changing to UL-CConly during communication as shown in FIG. As shown in FIG. 18, first, communication is performed only in the band FB2 (T70, (a) of FIG. 17). Thereafter, the base station 12A detects that the UL communication traffic volume in the band FB2 has increased (T71), and transmits a quality measurement request including the CC in the band FB1 to the terminal 11 (T72).
- the terminal 11 performs UL-CConly-compliant quality measurement in response to the received quality measurement request (T73).
- This quality measurement process is the same as the quality measurement process shown in FIG.
- the DL-CC instructed to the base station 12 for example, the DL-CC of the band FB1 is measured instead of measuring each DL-CC of another cell.
- the terminal 11 notifies the measured quality level of DL-CC to the base station 12A (T74).
- the base station 12A determines whether to perform CC change control (handover control) (T75).
- the base station 12A uses one UL-CC in the band FB2 as an UL-CC (UL-CConly) of the band FB1.
- the base station 12A notifies the terminal 11 of parameters for performing CC change control (handover control) (T76).
- T76 CC change control
- a DL-CC activation instruction corresponding to UL-CConly is also given as necessary.
- the activation instruction includes a monitoring instruction, a constant synchronization instruction, a quality measurement instruction, and the like.
- the terminal 11 changes the CC, that is, changes the UL-CC of the band FB2 of the base station 12A to the UL-CC of the band FB1 of the same base station 12A ( T77).
- the DL-CC reception system corresponding to the UL-CC is activated as necessary. Thereby, communication as shown in FIG. 17B is performed.
- DL-CC L1 synchronization corresponding to UL-CConly is performed (T78).
- the base station 12 is the same and only the band is changed to change to UL-CConly.
- the band is the same and only the base station 12 is changed to change the UL-CConly. The same can be said when it is changed.
- FIG. 19 is a schematic diagram of a wireless communication system according to the present embodiment.
- the terminal 11 monitors the quality of the DL-CC (DL-CC11) corresponding to UL-CConly (UL-CC11) (broken arrow in FIG. 1), and the quality is By notifying the station 12, the quality of UL-CConly is managed.
- the base station 12 measures and manages the quality of UL-CConly (UL-CC11). For this reason, the terminal 11 does not need to monitor the quality of DL-CC (DL-CC11) corresponding to UL-CConly.
- symbol is attached
- the wireless communication system 10 of this embodiment is similar in configuration to the wireless communication system 10 shown in FIG.
- FIG. 20 is a block diagram illustrating a schematic configuration of the terminal 11 in the present embodiment
- FIG. 21 is a block diagram illustrating a schematic configuration of the base station 12 in the present embodiment.
- the terminal 11 of the present embodiment is different from the terminal 11 shown in FIG. 3 in that a transmission power acquisition unit (transmission power acquisition unit) 28 is added to the control unit 24.
- the configuration of is the same.
- the base station 12 of the present embodiment is different from the base station 12 shown in FIG. 4 in that a reception power measurement unit (quality measurement unit) 38 is added to the control unit 34.
- the communication control unit 37 is different from the communication control unit 37 in that a communication control unit (communication control determination unit, quality measurement unit) 39 is provided.
- the transmission power acquisition unit 28 acquires transmission power information when the transmission unit 22 transmits data using UL-CConly.
- the transmission power acquisition unit 28 transmits the acquired transmission power information to the base station 12 via the transmission unit 22.
- the transmission power information may be acquired by measuring the transmission power of the transmission unit 22 or may be acquired from the transmission power information instructed by the communication control unit 27 to the transmission unit 22.
- the reception power measurement unit 38 measures reception power when the reception unit 31 receives data using UL-CConly.
- the reception power measurement unit 38 transmits information on the measured reception power to the communication control unit 39.
- the communication control unit 39 is obtained by adding the following function to the function of the communication control unit 37 shown in FIG. That is, the communication control unit 39 receives the transmission power information from the terminal 11 via the reception unit 31, and also receives the reception power information from the reception power measurement unit 38, and receives the transmission power and the transmission power.
- the quality level of UL-CConly is obtained from the received power.
- the communication control unit 39 determines UL-CConly transmission control based on the obtained UL-CConly quality level, and notifies the terminal 11 via the transmission unit 32.
- FIG. 22 is a sequence diagram showing an example of operations of the terminal 11 and the base station 12A in UL-CConly transmission control for the wireless communication system 10 of the present embodiment.
- the example of FIG. 22 is also an example in which the amount of UL communication is large, as in the above example, and the terminal 11 performs packet communication using a UL-CC set including UL-CConly. .
- FIG. 23 is a flowchart showing a process flow of quality measurement (terminal side) compatible with UL-CConly.
- the terminal 11 acquires the quality of each DL-CC of the DL-CC set currently in communication (S20).
- the radio propagation loss value (path loss value) of each DL-CC is calculated and acquired as the quality.
- the quality measurement may be performed according to an existing method.
- the terminal 11 transmits the quality of each DL-CC (DL-CC21) of the acquired DL-CC set and the transmission power value of the UL-CConly (UL-CC11) to the UL.
- the base station 12A is notified using CC21 (T81).
- the base station 12A performs UL-CConly quality measurement (base station side) based on the notified UL-CConly (UL-CC11) transmission power value (T82).
- FIG. 24 is a flowchart showing a flow of processing of quality measurement (base station side) compatible with UL-CConly.
- the base station 12A first determines whether UL-CConly exists (S81). If it does not exist, the above process is terminated because there is no need for the process. However, since it exists in this embodiment, the received power value of each UL-CConly is measured (S82). Next, UL-CConly quality is calculated from the measured received power value and the transmission power value received from the terminal 11 (S83). In this embodiment, a UL-CConly radio propagation loss value (path loss value) is calculated and used as a quality level. Thereafter, the above process ends.
- path loss value a UL-CConly radio propagation loss value
- the base station 12A determines UL-CC transmission control based on each acquired quality level (T22). Thereafter, the base station 12A notifies the terminal 11 of the determined UL-CC transmission control using the DL-CC 21 (T23). The terminal 11 performs transmission control of the notified UL-CC (T24).
- the terminal 11 may periodically perform the above-described UL-CConly-compliant quality measurement (terminal side) (T80 in FIG. 22, FIG. 23) or based on an instruction from the base station 12A. Also good.
- a sequence of quality measurement requests from the base station 12A is added before step T80 in FIG.
- the UL-CConly transmission power value to be notified by the terminal 11 can be included as a quality measurement request.
- the control may be changed to a control specialized for UL-CC only.
- the base station 12A performs only UL-CConly quality measurement.
- the terminal 11 sends the transmission power value to the base station 12A not only for UL-CConly but also for all UL-CCs.
- the base station 12 can perform quality measurement.
- FIG. 25 is a sequence diagram illustrating an example of operations of the terminal 11 and the base stations 12A and 12B in UL-CConly handover control according to this embodiment.
- the example of FIG. 25 is an example when the terminal 11 moves from the point a to the point b in FIG. 19, and is an example when the UL traffic is large as shown in FIGS. 5 and 6.
- the terminal 11 performs packet communication using a UL-CC set including UL-CConly.
- FIG. 26 is a flowchart showing a process flow of quality measurement (terminal side) compatible with UL-CConly.
- the terminal 11 acquires the quality of each DL-CC of the DL-CC set currently in communication (S40).
- the radio propagation loss value (path loss value) of each DL-CC is calculated and acquired as the quality.
- the quality measurement may be performed according to an existing method.
- each UL-CConly is acquired (S90). This transmission power value is a value used by the base station 12A to calculate a UL-CConly path loss value.
- each DL-CC related to another cell is measured, and its quality is acquired (S43). Thereafter, the above process ends.
- the terminal 11 transmits the quality of each DL-CC (DL-CC21) of the acquired DL-CC set and the transmission power value of the UL-CConly (UL-CC11) to the UL.
- -It notifies to the base station 12A using CC21 (T91).
- the base station 12A performs UL-CConly quality measurement (base station side) based on the notified UL-CConly (UL-CC11) transmission power value (T92).
- the UL-CConly-compliant quality measurement (base station side) process is the same as the process shown in FIG.
- the base station 12A determines handover control based on the notified quality (T42).
- the base station 12A notifies the above-described handover parameter to the terminal 11 using the DL-CC 21 (T43).
- the base station 12A notifies the base station 12B that UL-CConly (UL-CC11) is handed over from the base station 12A to the base station 12B (T44).
- the terminal 11 performs handover from the base station 12A only to UL-CConly (UL-CC11) to the base station 12B (T45).
- the terminal 11 may perform the above-described UL-CConly-compliant quality measurement (terminal side) (T90 in FIG. 25, FIG. 26) periodically or based on an instruction from the base station 12A. Also good.
- a sequence of quality measurement requests from the base station 12 is added before step T90 in FIG.
- the UL-CConly transmission power value to be notified by the terminal 11 can be included as a quality measurement request.
- FIG. 25 and FIG. 26 all the UL-CCs in the UL-CC set are described, but the control may be changed to a control specialized for UL-CConly.
- the present embodiment differs from the embodiments shown in FIGS. 1 to 12 only in the method of measuring the quality level of UL-CConly, and transmission control performed based on the quality level and The handover control is the same. Therefore, even when UL-CConly occurs during communication as shown in FIGS. 17 and 18, the method of measuring the quality level of UL-CConly can be changed to the method of this embodiment.
- various UL-CConly controls are performed based on the quality level based on the UL-CConly radio propagation loss.
- the terminal 11 in order to measure the radio propagation loss, notifies the base station 12 of the transmission power value.
- the base station 12 cannot measure the radio propagation loss because the transmission power value at the terminal 11 is unknown, and performs control with the absolute power value received by the base station 12.
- the base station 12 performs transmission control so that the reception level (absolute power value) of the UL-CC becomes a certain constant level. Specifically, the base station 12 controls the terminal 11 to decrease the transmission level when the UL-CC reception level (absolute power value) increases, while the terminal 11 controls the terminal 11 when the reception level decreases. On the other hand, control is performed to increase the transmission level. This control is performed periodically or in response to a transmission control request from the base station 12. For this reason, even if the terminal 11 moves away from the base station 12, the transmission control as described above results in a substantially constant reception level (absolute power value). It becomes difficult to judge that
- the base station 12 suddenly becomes unable to receive UL-CConly, or the terminal 11 moves away from the base station 12, and the terminal 11 is unnecessary even though the UL-CConly does not reach the base station 12. It is considered that a phenomenon occurs in which the UL-CConly radio wave is continuously emitted. In contrast, in the following example, control that does not cause such a phenomenon will be described.
- the base station 12 requests the terminal 11 to increase the transmission level.
- the transmission power cannot be increased in spite of a request from the base station 12. For this reason, the base station 12 can detect that the reception level (absolute power value) does not increase even though the terminal 11 is requested to increase the transmission level.
- the base station 12 determines that the terminal 11 has left the base station 12, and performs UL-CConly handover or stops transmission.
- the neighboring base stations 12 When performing the handover, when the base station 12 performs the above detection, the neighboring base stations 12 immediately try to receive UL-CConly from the terminal 11 and measure the quality level (absolute power value). Is handed over to the base station 12 that is good. If there is no base station 12 with a good quality level, or there is no base station 12 that can receive UL-CConly in the vicinity (for example, there is no base station 12 that supports the band used in UL-CConly). ) Immediately stop UL-CConly transmission.
- the base station 12 may always perform control to stop transmission of UL-CConly when the above detection is performed.
- the terminal 11 reports the measurement result of the quality level of the other cell to the base station 12, etc., so that the base station 12 determines that the stopped UL-CConly can be used again, or that another UL-CConly can be used. In this case, the terminal 11 may attempt a UL-CConly connection.
- the initial transmission power value in this case, a power value immediately before transmission stop or a power value smaller than the power value by a predetermined value may be used. Or you may transmit with the electric power value instruct
- the above-described phenomenon can be prevented.
- the UL-CConly transmission stop and reconnection control as described above is similar to the control using the DL-CC quality level corresponding to UL-CConly, as shown in FIGS. It is possible to do.
- FIG. 27 is a schematic diagram of a wireless communication system according to the present embodiment.
- UL-CConly transmission control and the like are performed by managing the quality of UL-CConly.
- control is performed so that UL-CConly does not exist.
- control is performed to always add a DL-CC corresponding to the UL-CC.
- symbol is attached
- FIG. 27 shows a state in which one of the two UL-CCs communicating in the band FB2 is changed to the UL-CC in the band FB1 from the state shown in FIG.
- the changed UL-CC becomes UL-CConly
- control is performed to monitor the DL-CC corresponding to the UL-CC.
- control is performed so that the DL-CC corresponding to the UL-CC is also added to the DL-CC set for the changed UL-CC.
- the radio communication system 10 of the present embodiment is similar in configuration to the radio communication system 10 shown in FIGS. 1 and 2, and the terminal 11 and the base station 12 are the same as the terminal 11 and the base station shown in FIGS. 12 is similar in configuration.
- FIG. 28 is a flowchart showing an example of CA set determination processing. This process corresponds to step T17 in the CA connection shown in FIG.
- the base station 12 acquires the quality level of each DL-CC of each base station 12 notified from the terminal 11 (S100).
- the DL-CC set number Nd and the UL-CC set number Nu are determined based on the requested communication amount, the communication traffic amount of the base station 12, and the like (S101).
- Nd DL-CCs are selected in order from the DL-CC having the highest quality level (S102).
- the quality level of the selected DL-CC is inferior, control for removing the DL-CC from the DL-CC set may be added. In this case, the DL-CC set is smaller than Nd.
- the base station 12 selects Nu UL-CCs in order from the UL-CC corresponding to the DL-CC having a high quality level (S103). Thereby, the UL-CC set is determined.
- step S103 if the quality level of the selected DL-CC is inferior, control for removing the UL-CC from the UL-CC set may be added as in the case of the DL-CC set. Good. In that case, the UL-CC set is smaller than Nu.
- the base station 12 determines whether there is a UL-CC in which a DL-CC corresponding to the selected UL-CC is not selected (S104). Basically, if Nu> Nd, the corresponding UL-CC exists. Here, it is assumed that the DL-CC corresponding to the UL-CC does not correspond to those not in the same band or not in the same cell.
- step S104 when there is no corresponding UL-CC (basically when Nu ⁇ Nd), a plurality of currently selected DL-CCs are determined as DL-CC sets, and the above processing is terminated. To do.
- the DL-CC corresponding to the corresponding UL-CC is the same cell as a plurality of currently selected DL-CCs, and It is determined whether or not the band is a CC (S105). That is, it is determined whether the corresponding UL-CC is UL-CConly. In the case of CCs of the same cell and band, a plurality of currently selected DL-CCs are determined as DL-CC sets, and the above process ends. On the other hand, when the CCs are not the same cell and band, the DL-CC set corresponding to each UL-CC is also selected and the DL-CC set is determined (S106). Thereafter, the above process ends.
- a CA set that does not have UL-CConly is determined. This eliminates the need for special transmission control for UL-CConly, and can be replaced with conventional transmission control.
- the base station 12 can accurately evaluate the communication quality of the assigned UL-CC, and the communication terminal 11 can accurately control uplink transmission in the UL-CC.
- a DL-CC for controlling the UL-CConly is added. It becomes larger than the number Nd of DL-CC sets determined based on the traffic amount and the like. That is, control for adding an extra DL-CC is performed in consideration of not only communication but also communication quality measurement. Further, it goes without saying that data may be transmitted as usual even in the case of the DL-CC for measuring communication quality.
- the selection is made in order from the DL-CC having the highest quality level, but it is also possible to make the selection from the DL-CC (or UL-CC) with sufficient radio resources.
- the acquisition of the quality level and the determination of whether or not there is a radio resource allowance can be performed simultaneously, and the optimum one can be selected in order.
- FIG. 29 is a flowchart showing another example of CA set determination processing.
- the example in FIG. 29 differs from the example in FIG. 28 in the processing after step S104, and the other processing is the same.
- step S104 when there is no corresponding UL-CC (basically when Nu ⁇ Nd), a plurality of currently selected DL-CCs are determined as DL-CC sets, and the above processing is terminated. To do. On the other hand, if the corresponding UL-CC exists (basically when Nu> Nd), the DL-CC set corresponding to the corresponding UL-CC is also selected to determine the DL-CC set (S110). . Thereafter, the above process ends.
- the discontinuous bands FB1 and FB2 are used, but a continuous band or a band that partially overlaps may be used.
- two bands FB1 and FB2 are used.
- three or more bands may be used. Even in this case, the UL-CC in any band is more likely to be closer in frequency to the DL-CC in the same band than the DL-CC in another band. The effects described above can be achieved.
- the present invention can also be expressed as follows.
- the base station assigns the uplink small band corresponding to the downlink small band to the communication terminal in descending order of the communication quality value of the downlink small band measured by the communication terminal. Also good. In this case, there is a high possibility that uplink transmission in the allocated small band for uplink is performed satisfactorily.
- the uplink small band may be allocated from a frequency band with sufficient resources.
- the monitoring downlink small band measured by the quality measuring unit of the communication terminal may be determined by the band allocating unit of the base station.
- the quality measurement means of the communication terminal may measure the communication quality of the monitoring downlink small band in addition to the allocated downlink small band communication quality, and the base station and the communication There is no need for the terminal to provide special means for the uplink small band in the only state. Note that the communication terminal may determine the monitoring downlink small band.
- the monitoring downlink small band is not included in the allocated downlink small band, and is not used for downlink transmission from the base station to the communication terminal. Therefore, the quality measuring unit of the communication terminal may take time to measure the communication quality of the monitoring small band for downlink.
- the communication control means of the communication terminal may maintain synchronization in the physical layer of the monitoring downlink small band.
- the quality measurement means of the communication terminal can quickly measure the communication quality of the monitoring downlink small band, and as a result, the communication control of the uplink small band in the only state based on the communication quality. Can be done dynamically.
- the quality measuring means of the communication terminal further measures the communication quality of a small band for downlink by a base station different from the base station, and the communication control of the base station
- the determining unit is configured to correspond to the downlink small band based on a comparison between the communication quality of the downlink small band by the base station and the another base station measured by the quality measuring unit of the communication terminal. It may be determined whether to perform handover of the uplink small band. In this case, special handover control is not required even if the uplink small band in the only state exists.
- the comparison may be performed by the quality measuring unit of the communication terminal or the communication control determining unit of the base station.
- the quality measuring unit of the communication terminal performs, the result of the comparison is notified to the base station.
- the base station may be notified of the result of the comparison by distinguishing the result of the allocated downlink small band from that of the allocated downlink small band.
- the comparison may be performed by comparing a value obtained by adding a predetermined threshold value to the communication quality value of the downlink small band by the base station and a communication quality value of the downlink small band by the other base station. Good.
- the threshold it is possible to prevent frequent handovers due to variations in the measurement of the communication quality.
- the predetermined threshold value may be different from that for the allocated downlink small band and for the monitoring downlink small band. In this case, even if the measurement variation in the communication quality of the monitoring small band for downlink is different from the measurement variation in the communication quality of the allocated downlink small band, the respective threshold values are made different. It can respond by doing.
- the quality measuring means of the communication terminal further measures the communication quality of a small band for downlink by a base station different from the base station, and the communication control of the base station
- the determining means includes the communication quality of the uplink small band in the only state obtained by the quality measuring means, and the communication quality of the downlink small band by the another base station measured by the quality measuring means of the communication terminal, Based on the comparison, it may be determined whether to perform handover of the uplink small band in the only state.
- the handover control since the handover control is determined using the communication quality of the uplink small band that is directly obtained, the handover control can be performed with high accuracy.
- the communication terminal further includes transmission power acquisition means for acquiring transmission power of the uplink small band, and the quality measurement means of the base station is configured to update the only state. It is preferable that the communication quality is obtained from the measured received power and the transmission power acquired by the transmission power acquisition means of the communication terminal with respect to the link small band.
- the transmission power acquisition means of the communication terminal may acquire the transmission power in the uplink small band in the only state by measurement or from a transmission power instruction to a communication unit in the communication terminal. May be.
- wireless communications system can be made to perform a computer with a control program.
- the control program can be executed on an arbitrary computer.
- each block of the wireless communication system 10 in particular, a control unit (communication control unit / quality measurement unit / transmission power acquisition unit) 24 and a control unit (band allocation unit / communication control determination unit / quality measurement unit) 34
- You may comprise by a hardware logic and may implement
- the wireless communication system 10 includes a CPU (central processing unit) that executes instructions of a control program for realizing each function, a ROM (read only memory) that stores the program, and a RAM (random access memory) that develops the program. And a storage device (recording medium) such as a memory for storing the program and various data.
- An object of the present invention is to provide a recording medium on which a program code (execution format program, intermediate code program, source program) of a control program of the wireless communication system 10 which is software for realizing the above-described functions is recorded so as to be readable by a computer. This can also be achieved by supplying the wireless communication system 10 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).
- Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R.
- Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.
- the wireless communication system 10 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
- the communication network is not particularly limited.
- the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available.
- the transmission medium constituting the communication network is not particularly limited.
- wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc.
- infrared rays such as IrDA and remote control, Bluetooth (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used.
- the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
- the uplink small band and the downlink small band are allocated so that only the uplink small band is not generated, or the communication quality of the uplink small band is accurately obtained.
- the base station can be applied to any wireless communication system that allocates the uplink small band and the downlink small band to the communication terminal. Can be applied.
- wireless communication system 11 terminal (communication terminal) 12 base station 13 cell 14 core network device 20 receiving antenna 21 receiving unit (communication unit) 22 Transmitter (communication unit) 23 Transmitting antenna 24 Control unit 25 Packet communication request unit 26 Quality measuring unit (quality measuring means) 27 Communication control unit (communication control means) 28 Transmission power acquisition unit (transmission power acquisition means) 30 receiving antenna 31 receiving unit (communication unit) 32 Transmitter (communication unit) 33 Transmitting Antenna 34 Control Unit 35 CA Candidate Determination Unit 36 CA Set Determination Unit (Bandwidth Allocation Unit) 37 Communication control unit (communication control determining means) 38 Received power measurement unit (quality measurement means) 39 Communication control unit (communication control determining means, quality measuring means) FB1, FB2 frequency band
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Abstract
Description
本発明の一実施形態について図1~図18に基づいて説明すれば、以下の通りである。
次に、本発明の別の実施形態について、図19~図26に基づいて説明すれば、以下の通りである。図19は、本実施形態である無線通信システムの概要図である。
次に、本発明の他の実施形態について、図27~図29に基づいて説明すれば、以下の通りである。図27は、本実施形態である無線通信システムの概要図である。
前記比較は、前記基地局によるダウンリンク用小帯域の通信品質の値に所定の閾値を加算したものと、前記別の基地局によるダウンリンク用小帯域の通信品質の値とを比較するものでもよい。前記閾値を利用することにより、前記通信品質の測定のバラツキによりハンドオーバが頻繁に発生することを防止できる。
11 端末(通信端末)
12 基地局
13 セル
14 コアネットワーク装置
20 受信アンテナ
21 受信部(通信部)
22 送信部(通信部)
23 送信アンテナ
24 制御部
25 パケット通信要求部
26 品質測定部(品質測定手段)
27 通信制御部(通信制御手段)
28 送信電力取得部(送信電力取得手段)
30 受信アンテナ
31 受信部(通信部)
32 送信部(通信部)
33 送信アンテナ
34 制御部
35 CA候補決定部
36 CAセット決定部(帯域割当手段)
37 通信制御部(通信制御決定手段)
38 受信電力測定部(品質測定手段)
39 通信制御部(通信制御決定手段、品質測定手段)
FB1・FB2 周波数帯域
Claims (19)
- 複数の周波数帯域を利用して、基地局と通信端末とが無線通信を行う無線通信システムであって、
前記複数の周波数帯域のそれぞれは、前記基地局から前記通信端末へのダウンリンク伝送に利用される周波数帯域であるダウンリンク用小帯域と、前記通信端末から前記基地局へのアップリンク伝送に利用される周波数帯域であるアップリンク用小帯域とを含んでおり、
前記基地局は、前記複数の周波数帯域の中から、前記ダウンリンク用小帯域および前記アップリンク用小帯域を前記通信端末に割り当てる帯域割当手段を備えており、
前記通信端末は、前記基地局の帯域割当手段が割り当てた割当済のダウンリンク用小帯域の通信品質を測定する品質測定手段を備えており、
前記基地局は、前記通信端末の品質測定手段が測定した割当済のダウンリンク用小帯域の通信品質に基づいて、当該割当済のダウンリンク用小帯域に対応する、前記基地局の帯域割当手段が割り当てた割当済のアップリンク用小帯域の通信制御を決定する通信制御決定手段を備えており、
前記通信端末は、前記基地局の通信制御決定手段が決定した前記割当済のアップリンク用小帯域の通信制御に基づいて、当該割当済のアップリンク用小帯域での前記アップリンク伝送を制御する通信制御手段を備えており、
前記基地局の帯域割当手段が、前記通信端末に対し、前記アップリンク用小帯域を割り当てているが、前記ダウンリンク用小帯域を割り当てていない前記周波数帯域が存在する場合、
前記通信端末の品質測定手段は、当該周波数帯域における非割当の前記ダウンリンク用小帯域の通信品質を、監視用の前記ダウンリンク用小帯域としてさらに測定しており、
前記基地局の通信制御決定手段は、前記通信端末の品質測定手段が測定した監視用のダウンリンク用小帯域の通信品質に基づいて、当該周波数帯域における割当済のアップリンク用小帯域であるオンリー状態のアップリンク用小帯域の通信制御を決定することを特徴とする無線通信システム。 - 前記通信端末の品質測定手段が測定する前記監視用のダウンリンク用小帯域は、前記基地局の帯域割当手段が決定することを特徴とする請求項1に記載の無線通信システム。
- 前記通信端末の通信制御手段は、前記監視用のダウンリンク用小帯域の物理レイヤーでの同期を維持することを特徴とする請求項1に記載の無線通信システム。
- 前記通信端末の品質測定手段は、さらに、前記基地局とは別の基地局によるダウンリンク用小帯域の通信品質を測定しており、
前記基地局の通信制御決定手段は、前記通信端末の品質測定手段が測定した、前記基地局および前記別の基地局によるダウンリンク用小帯域の通信品質どうしの比較に基づいて、前記ダウンリンク用小帯域に対応する前記アップリンク用小帯域のハンドオーバを行うかを決定することを特徴とする請求項1から3までの何れか1項に記載の無線通信システム。 - 前記比較は、前記通信端末の品質測定手段が行うことを特徴とする請求項4に記載の無線通信システム。
- 前記通信端末の品質測定手段は、前記比較の結果を、前記割当済のダウンリンク用小帯域に関するものと、前記監視用のダウンリンク用小帯域に関するものとに区別して前記基地局に通知することを特徴とする請求項5に記載の無線通信システム。
- 前記比較は、前記基地局によるダウンリンク用小帯域の通信品質の値に所定の閾値を加算したものと、前記別の基地局によるダウンリンク用小帯域の通信品質の値とを比較するものであり、
前記所定の閾値は、前記割当済のダウンリンク用小帯域に関するものと、前記監視用のダウンリンク用小帯域に関するものとが異なることを特徴とする請求項4から6までの何れか1項に記載の無線通信システム。 - 複数の周波数帯域を利用して、基地局と通信端末とが無線通信を行う無線通信システムであって、
前記複数の周波数帯域のそれぞれは、前記基地局から前記通信端末へのダウンリンク伝送に利用される周波数帯域であるダウンリンク用小帯域と、前記通信端末から前記基地局へのアップリンク伝送に利用される周波数帯域であるアップリンク用小帯域とを含んでおり、
前記基地局は、前記複数の周波数帯域の中から、前記ダウンリンク用小帯域および前記アップリンク用小帯域を前記通信端末に割り当てる帯域割当手段を備えており、
前記通信端末は、前記基地局の帯域割当手段が割り当てた割当済のダウンリンク用小帯域の通信品質を測定する品質測定手段を備えており、
前記基地局は、前記通信端末の品質測定手段が測定した割当済のダウンリンク用小帯域の通信品質に基づいて、当該割当済のダウンリンク用小帯域とに対応する、前記基地局の帯域割当手段が割り当てた割当済のアップリンク用小帯域の通信制御を決定する通信制御決定手段を備えており、
前記通信端末は、前記基地局の通信制御決定手段が決定した前記割当済のアップリンク用小帯域の通信制御に基づいて、当該割当済のアップリンク用小帯域での前記アップリンク伝送を制御する通信制御手段を備えており、
前記基地局は、前記アップリンク用小帯域の受信電力を測定し、測定した受信電力により、当該アップリンク用小帯域の通信品質を求める品質測定手段を備えており、
前記基地局の帯域割当手段が、前記通信端末に対し、前記アップリンク用小帯域を割り当てているが、前記ダウンリンク用小帯域を割り当てていない前記周波数帯域が存在する場合、
前記基地局の通信制御決定手段は、当該周波数帯域における割当済の前記アップリンク用小帯域であるオンリー状態のアップリンク用小帯域について、前記品質測定手段が求めた通信品質に基づいて、前記オンリー状態のアップリンク用小帯域の通信制御を決定することを特徴とする無線通信システム。 - 前記通信端末の品質測定手段は、さらに、前記基地局とは別の基地局によるダウンリンク用小帯域の通信品質を測定しており、
前記基地局の通信制御決定手段は、前記品質測定手段が求めたオンリー状態のアップリンク用小帯域の通信品質と、前記通信端末の品質測定手段が測定した、前記別の基地局によるダウンリンク用小帯域の通信品質との比較に基づいて、当該オンリー状態のアップリンク用小帯域のハンドオーバを行うかを決定することを特徴とする請求項8に記載の無線通信システム。 - 前記通信端末は、前記アップリンク用小帯域の送信電力を取得する送信電力取得手段をさらに備えており、
前記基地局の品質測定手段は、前記オンリー状態のアップリンク用小帯域に関して、測定した受信電力と、前記通信端末の送信電力取得手段が取得した送信電力とにより、前記通信品質を求めることを特徴とする請求項8または9に記載の無線通信システム。 - 複数の周波数帯域を利用して、基地局と通信端末とが無線通信を行う無線通信システムであって、
前記複数の周波数帯域のそれぞれは、前記基地局から前記通信端末へのダウンリンク伝送に利用される周波数帯域であるダウンリンク用小帯域と、前記通信端末から前記基地局へのアップリンク伝送に利用される周波数帯域であるアップリンク用小帯域とを含んでおり、
前記基地局は、前記複数の周波数帯域の中から、前記ダウンリンク用小帯域および前記アップリンク用小帯域を前記通信端末に割り当てる帯域割当手段を備えており、
前記通信端末は、前記基地局の帯域割当手段が割り当てた割当済のダウンリンク用小帯域の通信品質を測定する品質測定手段を備えており、
前記基地局は、前記通信端末の品質測定手段が測定した割当済のダウンリンク用小帯域の通信品質に基づいて、当該割当済のダウンリンク用小帯域とに対応する、前記基地局の帯域割当手段が割り当てた割当済のアップリンク用小帯域の通信制御を決定する通信制御決定手段を備えており、
前記通信端末は、前記基地局の通信制御決定手段が決定した前記割当済のアップリンク用小帯域の通信制御に基づいて、当該割当済のアップリンク用小帯域での前記アップリンク伝送を制御する通信制御手段を備えており、
前記基地局の帯域割当手段が、前記通信端末に対し、前記アップリンク用小帯域を割り当てる必要があるが、前記ダウンリンク用小帯域を割り当てる必要がない前記周波数帯域が存在する場合、
前記基地局の帯域割当手段は、当該周波数帯域における前記ダウンリンク用小帯域を、前記通信品質を測定するためのダウンリンク用小帯域として、前記通信端末に割り当てることを特徴とする無線通信システム。 - 前記基地局の帯域割当手段は、前記通信端末の品質測定手段が測定した前記ダウンリンク用小帯域の通信品質の値の大きい順に、該ダウンリンク用小帯域に対応する前記アップリンク用小帯域を前記通信端末に割り当てることを特徴とする請求項1から11までの何れか1項に記載の無線通信システム。
- 請求項1から12までの何れか1項に記載の無線通信システムにて利用される基地局。
- 請求項1から12までの何れか1項に記載の無線通信システムにて利用される通信端末。
- 請求項1から12までの何れか1項に記載の無線通信システムを動作させる制御プログラムであって、コンピュータを上記の各手段として機能させるための制御プログラム。
- 請求項15に記載の制御プログラムが記録されたコンピュータ読取り可能な記録媒体。
- 複数の周波数帯域を利用して、基地局と通信端末とが無線通信を行う無線通信システムであって、前記複数の周波数帯域のそれぞれは、前記基地局から前記通信端末へのダウンリンク伝送に利用される周波数帯域であるダウンリンク用小帯域と、前記通信端末から前記基地局へのアップリンク伝送に利用される周波数帯域であるアップリンク用小帯域とを含む無線通信システムの制御方法であって、
前記基地局は、前記複数の周波数帯域の中から、前記ダウンリンク用小帯域および前記アップリンク用小帯域を前記通信端末に割り当てる帯域割当ステップと、
前記通信端末は、該帯域割当ステップにて割り当てられた割当済のダウンリンク用小帯域の通信品質を測定する品質測定ステップと、
前記基地局は、該品質測定ステップにて測定された割当済のダウンリンク用小帯域の通信品質に基づいて、当該割当済のダウンリンク用小帯域に対応する、前記帯域割当ステップにて割り当てられた割当済のアップリンク用小帯域の通信制御を決定する通信制御決定ステップと、
前記通信端末は、前記通信制御決定ステップにて決定された前記割当済のアップリンク用小帯域の通信制御に基づいて、当該割当済のアップリンク用小帯域での前記アップリンク伝送を制御する通信制御ステップとを含んでおり、
前記帯域割当ステップにおいて、前記通信端末に対し、前記アップリンク用小帯域が割り当てられているが、前記ダウンリンク用小帯域が割り当てられていない前記周波数帯域が存在する場合、
前記品質測定ステップは、当該周波数帯域における非割当の前記ダウンリンク用小帯域の通信品質を、監視用の前記ダウンリンク用小帯域としてさらに測定しており、
前記通信制御決定ステップは、前記品質測定ステップにて測定された監視用のダウンリンク用小帯域の通信品質に基づいて、当該周波数帯域における割当済のアップリンク用小帯域であるオンリー状態のアップリンク用小帯域の通信制御を決定することを特徴とする無線通信システムの制御方法。 - 複数の周波数帯域を利用して、基地局と通信端末とが無線通信を行う無線通信システムであって、前記複数の周波数帯域のそれぞれは、前記基地局から前記通信端末へのダウンリンク伝送に利用される周波数帯域であるダウンリンク用小帯域と、前記通信端末から前記基地局へのアップリンク伝送に利用される周波数帯域であるアップリンク用小帯域とを含む無線通信システムの制御方法であって、
前記基地局は、前記複数の周波数帯域の中から、前記ダウンリンク用小帯域および前記アップリンク用小帯域を前記通信端末に割り当てる帯域割当ステップと、
前記通信端末は、該帯域割当ステップにて割り当てられた割当済のダウンリンク用小帯域の通信品質を測定する品質測定ステップと、
前記基地局は、該品質測定ステップにて測定された割当済のダウンリンク用小帯域の通信品質に基づいて、当該割当済のダウンリンク用小帯域に対応する、前記帯域割当ステップにて割り当てられた割当済のアップリンク用小帯域の通信制御を決定する通信制御決定ステップと、
前記通信端末は、前記通信制御決定ステップにて決定された前記割当済のアップリンク用小帯域の通信制御に基づいて、当該割当済のアップリンク用小帯域での前記アップリンク伝送を制御する通信制御ステップと、
前記基地局は、前記アップリンク用小帯域の受信電力を測定し、測定した受信電力により、当該アップリンク用小帯域の通信品質を求める品質測定ステップとを含んでおり、
前記帯域割当ステップにおいて、前記通信端末に対し、前記アップリンク用小帯域が割り当てられているが、前記ダウンリンク用小帯域が割り当てられていない前記周波数帯域が存在する場合、
前記通信制御決定ステップは、当該周波数帯域における割当済の前記アップリンク用小帯域であるオンリー状態のアップリンク用小帯域について、前記品質測定ステップにて求められた通信品質に基づいて、前記オンリー状態のアップリンク用小帯域の通信制御を決定することを特徴とする無線通信システムの制御方法。 - 複数の周波数帯域を利用して、基地局と通信端末とが無線通信を行う無線通信システムであって、前記複数の周波数帯域のそれぞれは、前記基地局から前記通信端末へのダウンリンク伝送に利用される周波数帯域であるダウンリンク用小帯域と、前記通信端末から前記基地局へのアップリンク伝送に利用される周波数帯域であるアップリンク用小帯域とを含む無線通信システムの制御方法であって、
前記基地局は、前記複数の周波数帯域の中から、前記ダウンリンク用小帯域および前記アップリンク用小帯域を前記通信端末に割り当てる帯域割当ステップと、
前記通信端末は、該帯域割当ステップにて割り当てられた割当済のダウンリンク用小帯域の通信品質を測定する品質測定ステップと、
前記基地局は、該品質測定ステップにて測定された割当済のダウンリンク用小帯域の通信品質に基づいて、当該割当済のダウンリンク用小帯域に対応する、前記帯域割当ステップにて割り当てられた割当済のアップリンク用小帯域の通信制御を決定する通信制御決定ステップと、
前記通信端末は、前記通信制御決定ステップにて決定された前記割当済のアップリンク用小帯域の通信制御に基づいて、当該割当済のアップリンク用小帯域での前記アップリンク伝送を制御する通信制御ステップとを含んでおり、
前記帯域割当ステップにおいて、前記通信端末に対し、前記アップリンク用小帯域を割り当てる必要があるが、前記ダウンリンク用小帯域を割り当てる必要がない前記周波数帯域が存在する場合、
前記帯域割当ステップは、当該周波数帯域における前記ダウンリンク用小帯域を、前記通信品質を測定するためのダウンリンク用小帯域として、前記通信端末に割り当てることを特徴とする無線通信システム制御方法。
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014022896A (ja) * | 2012-07-17 | 2014-02-03 | Sharp Corp | 送信装置、通信システム、送信方法、及び送信プログラム |
JP2016005041A (ja) * | 2014-06-13 | 2016-01-12 | 富士通株式会社 | 基地局装置及び帯域制御方法 |
KR20190136126A (ko) * | 2016-11-05 | 2019-12-09 | 애플 인크. | 비대칭 대역폭 지원 및 동적 대역폭 조정 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015028053A1 (en) * | 2013-08-28 | 2015-03-05 | Telefonaktiebolaget L M Ericsson (Publ) | Attachment of a mobile terminal to a radio access network |
US9674755B2 (en) * | 2014-01-15 | 2017-06-06 | Qualcomm Incorporated | Intra and inter-frequency handover in LTE with uplink and downlink metrics |
US20160302094A1 (en) * | 2015-04-09 | 2016-10-13 | Lg Electronics Inc. | Method of measuring radio resource and apparatus therefor |
US10856175B1 (en) * | 2015-08-17 | 2020-12-01 | Sprint Spectrum L.P. | Method and system for managing congestion in inter-band carrier aggregation |
JP6397955B1 (ja) * | 2017-04-07 | 2018-09-26 | パナソニック株式会社 | 端末装置、通信システムおよび通信品質測定方法 |
US10716158B1 (en) | 2019-01-16 | 2020-07-14 | Sprint Spectrum L.P. | Configuration of carrier-aggregation service with dual-connectivity service |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5991284A (en) * | 1997-02-13 | 1999-11-23 | Qualcomm Inc. | Subchannel control loop |
ATE311708T1 (de) * | 2000-04-25 | 2005-12-15 | Nortel Networks Ltd | Drahtloses telekommunikationssystem mit einer reduzierten verzögerung für die datenübermittlung |
JP5260842B2 (ja) * | 2006-06-14 | 2013-08-14 | 日本電気株式会社 | 通信システム及びその方法並びにそれに用いる移動局及び基地局 |
WO2008050424A1 (fr) * | 2006-10-25 | 2008-05-02 | Fujitsu Limited | Système de communication sans fil, station radio fixe, et procédé de commutation de station de base |
WO2008053550A1 (en) * | 2006-11-01 | 2008-05-08 | Fujitsu Limited | Wireless communication system |
CN101543101A (zh) * | 2006-11-30 | 2009-09-23 | Lm爱立信电话有限公司 | 在组播消息中以差分方式报告测量值以减少信令带宽负荷的方法和装置 |
US8665801B2 (en) * | 2008-01-08 | 2014-03-04 | Alcatel Lucent | Allocating forward link resources for transmitting data over a shared forward link data channel without allocating reverse link resources for reverse link data transmission |
US8522105B2 (en) * | 2009-02-17 | 2013-08-27 | Samsung Electronics Co., Ltd | Transmission of acknowledgement signals |
US20100231461A1 (en) * | 2009-03-13 | 2010-09-16 | Qualcomm Incorporated | Frequency selective multi-band antenna for wireless communication devices |
WO2010134121A1 (ja) * | 2009-05-18 | 2010-11-25 | 富士通株式会社 | 無線通信方法、無線通信システム、基地局装置および携帯端末 |
KR101695811B1 (ko) * | 2009-06-02 | 2017-01-23 | 엘지전자 주식회사 | 다중 하향링크 반송파에 대한 측정 방법 및 이를 위한 장치 |
US8588205B2 (en) * | 2010-02-12 | 2013-11-19 | Mediatek Inc. | Uplink power control message indexing in wireless OFDMA systems |
-
2011
- 2011-12-02 WO PCT/JP2011/077983 patent/WO2012074113A1/ja active Application Filing
- 2011-12-02 CN CN201180051511.0A patent/CN103190190B/zh active Active
- 2011-12-02 JP JP2012546962A patent/JP5662474B2/ja active Active
- 2011-12-02 US US13/876,661 patent/US9215698B2/en active Active
Non-Patent Citations (4)
Title |
---|
"RAN WG4, Reply LS on pathloss measurements in CA scenarios", 3GPP TSG RAN WG2 MEETING #70BIS, June 2010 (2010-06-01), pages 1 - 3 * |
"TSG-RAN WG2 (RAN2), LS on pathloss measurements in CA scenarios", 3GPP TSG RAN WG4 MEETING #55, May 2010 (2010-05-01), pages 1 - 2 * |
HUAWEI: "Pathloss derivation for UL PC in LTE-A", 3GPP TSG RAN WG1 MEETING #61BIS, June 2010 (2010-06-01), pages 1 - 2 * |
SAMSUNG: "Path-Loss Derivation for CA", 3GPP TSG RAN WG1 #61BIS, June 2010 (2010-06-01), pages 1 - 2 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014022896A (ja) * | 2012-07-17 | 2014-02-03 | Sharp Corp | 送信装置、通信システム、送信方法、及び送信プログラム |
JP2016005041A (ja) * | 2014-06-13 | 2016-01-12 | 富士通株式会社 | 基地局装置及び帯域制御方法 |
KR20190136126A (ko) * | 2016-11-05 | 2019-12-09 | 애플 인크. | 비대칭 대역폭 지원 및 동적 대역폭 조정 |
KR102149630B1 (ko) * | 2016-11-05 | 2020-08-28 | 애플 인크. | 비대칭 대역폭 지원 및 동적 대역폭 조정 |
US10973030B2 (en) | 2016-11-05 | 2021-04-06 | Apple Inc. | Asymmetric bandwidth support and dynamic bandwidth adjustment |
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JP5662474B2 (ja) | 2015-01-28 |
US9215698B2 (en) | 2015-12-15 |
CN103190190A (zh) | 2013-07-03 |
JPWO2012074113A1 (ja) | 2014-05-19 |
CN103190190B (zh) | 2016-04-27 |
US20130208615A1 (en) | 2013-08-15 |
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