WO2013140533A1 - Appareil de communication sans fil - Google Patents

Appareil de communication sans fil Download PDF

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Publication number
WO2013140533A1
WO2013140533A1 PCT/JP2012/057082 JP2012057082W WO2013140533A1 WO 2013140533 A1 WO2013140533 A1 WO 2013140533A1 JP 2012057082 W JP2012057082 W JP 2012057082W WO 2013140533 A1 WO2013140533 A1 WO 2013140533A1
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WO
WIPO (PCT)
Prior art keywords
band
scell
pcell
radio
base station
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PCT/JP2012/057082
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English (en)
Japanese (ja)
Inventor
大出高義
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富士通株式会社
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Priority to PCT/JP2012/057082 priority Critical patent/WO2013140533A1/fr
Publication of WO2013140533A1 publication Critical patent/WO2013140533A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the following embodiment relates to a wireless communication device.
  • LTE Release 10 Long Term Evolution Release 10
  • Rel′8 Release 8
  • LTE-Advanced system which is an extension of the LTE system
  • technologies such as Carrier Aggregation, uplink MIMO (Multi-Input-Multi-Output) transmission, and radio relay device (Relay) are newly added in Rel'10.
  • CoMP Coordinat Multi Point transmission and reception
  • 8x8 MIMO transmission In the future, studies are underway to introduce CoMP (Coordinate Multi Point transmission and reception) and 8x8 MIMO transmission.
  • the LTE-Advanced system is an extension of the LTE system, so it has a configuration that includes the LTE system and accommodates terminals that support only LTE Rel'8 and Rel'9. It must be possible. That is, the LTE-Advanced system specification must be Upper compatible with the LTE system specification.
  • the up / down bandwidth can be set to 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz (see TS36.101V10.4.0 5.6).
  • the band set in this way is defined as Component ⁇ Carrier (CC).
  • CC Component ⁇ Carrier
  • the reason why multiple bandwidths are set is that the bandwidth allocated to the conventional GSM (Global System for Mobile Communications) system and W-CDMA (Wideband-Code Divisional Multiple Access) system is used as it is. This is because it is assumed.
  • the LTE system must realize high-speed transmission compared with the conventional GSM system and W-CDMA system. Therefore, the bandwidth must be wide compared to these systems.
  • the band and frequency band used in a wireless communication system vary depending on the situation in each country. Furthermore, in Europe, it is connected to other countries on the land, and there is a need to consider interference, and the frequency band used is adjusted between countries. As a result, the available bandwidth is reduced and shredded. On the other hand, as described above, the LTE system must be broadband.
  • FIGS. 1 to 7 are diagrams for explaining Carrier Aggregation.
  • Carrier Aggregation integrates a plurality of bands having the bandwidth set as described above, and the following three patterns are shown in the 3GPP specification. 1) Integrating consecutive bands of the same frequency band See Figure 1 2) Integrate discontinuous bands of the same frequency band See Figure 2 3) Integrate different frequency bands. See Figure 3
  • Fig. 1 there are Component Carriers (CC2, CC3, CC4, CC5) in the same frequency band. Of these, consecutive Aggregation of CC2 and CC3 is performed.
  • FIG. 2 among CC2 to CC5 in the same frequency band, discontinuous CC2 and CC4 are carrier-aggregated.
  • FIG. 3 there is a frequency band consisting of CC1 and a frequency band consisting of CC2 to CC5, and different bands and discontinuous CC1 and CC2 are Carrier-Aggregated.
  • a band having a bandwidth defined in the LTE specification (for example, Rel'8) is regarded as one unit, and in the LTE-Advanced system, the band is called Component ⁇ Carrier. That is, Carrier Aggregation is supposed to aggregate (integrate) a plurality of Component Carriers.
  • Carrier Aggregation can be seen as a technology for data transmission using multiple bands simultaneously.
  • PCell Primary Cell
  • PCell is set at the time of initial connection, reconnection, reconfiguration, or handover according to the definition of TS36.331V10.3.0 3.1.
  • connection initial line setting
  • this is a cell used at the time of initial connection (at the time of initial line setting) or the like.
  • SCell Secondary Cell
  • TS36.331V10.3.0 6.3.4 SCellIndex 1-7 TS36.331V10.3.0 6.3.4 SCellIndex 1-7.
  • Carrier Aggregation is possible using up to 8 Component Carriers together with PCell.
  • the LTE-Advanced system assumes a maximum bandwidth of 100MHz, and in the case of 1CC 20MHz, it is possible to perform carrier aggregation using up to four SCells and up to five Component Carriers together with PCell. .
  • Carrier Aggregation integrates PCell and at least one SCell.
  • CC2 SCell is CarrierCellAggregation for CC1 PCell.
  • the 3GPP Cell definition is “one service area is configured using one frequency”. Therefore, it is defined that one cell is configured for Component Carrier. Therefore, Component Carrier constituting one cell is called Cell.
  • Serving Cell is also defined (see TS21.905V10.3.0-3 and TS36.331V10.3.0-3.1, 6.3.4 ServCellIndex).
  • ServingServCell is a cell where a terminal is camping according to TS21.905 definition. In other words, it is a cell in which the terminal is located.
  • CA Carrier Aggregation
  • PCell is only one serving Cell.
  • CA Carrier Aggregation
  • SCell is Serving ⁇ Cell. That is, both PCell and SCell are Serving Cell.
  • Serving Cell is defined from 0 to 7. Further, 0 is PCell, and 1 to 7 are defined as SCells. From the above, it can be seen that CA of up to 8CC is possible.
  • Each component carrier sets a downlink control channel (PDCCH: Physical Downlink Control CHannel) and uses the control signal transmitted on the downlink control channel (PDCCH) to perform uplink or uplink and downlink data transmission To do.
  • a downlink control channel (PDCCH) is set only for PCell, and uplink or uplink and downlink data transmission is performed in each CC using a control signal transmitted by this control channel. This is called Cross Carrier Scheduling. As shown in FIG.
  • the downlink control channel PDCCH is set in the PCell, and scheduling of the downlink downlink shared data channel PDSCH (Physical Downlink Shared CHannel) of the PCell and downlink downlink shared data channel PDSCH of the SCell is performed.
  • PDSCH Physical Downlink Shared CHannel
  • the difference between the left diagram and the right diagram in FIG. 5 will be described later.
  • the downlink radio shared channel may be simply referred to as a downlink data channel.
  • PCell is set at the time of initial connection, at the time of resetting, or at the time of a handover.
  • a setting at the time of handover will be described.
  • handover it is described as a handover from a handover source base station (hereinafter referred to as Source eNB (E-UTRAN Node B)) to a handover destination base station (hereinafter referred to as Target eNB).
  • Source eNB E-UTRAN Node B
  • Target eNB a handover destination base station
  • 3GPP defines that one base station is set for one cell.
  • a cell is defined as a region served by one frequency.
  • a general base station sets up a plurality of sectors (for example, 3 sectors or 6 sectors) using a plurality of frequencies and performs communication. Therefore, a general base station is made up of a plurality of cells. In other words, it can be said that one base station as viewed from the exterior or the entire apparatus is an aggregate of a plurality of base stations as a function.
  • the handover source cell as Source Cell
  • the handover destination cell as Target Cell
  • a handover command is transmitted from the source cell to the terminal, and the terminal performs the handover in response to this.
  • Target Cell and handover timing are specified. Specifically, it is as follows.
  • HandoverCommand message is included in DL-DCCH (DownLink-Dedicated Control CHannel) -Message including RRC (Radio Resource Control) Connection Reconfiguration message.
  • HandoverCommandMessage is created by Target eNB, transmitted to Source eNB via X2 interface, and sent from Source eNB to UE.
  • Source Cell and Target Cell when Source Cell and Target Cell are selected for the cells configured by the same base station, they may be transmitted without using the X2 interface because they are in the same base station.
  • the appearance is one base station and the function is a plurality of base stations, even if the above-mentioned X2 interface is provided between the base stations as a function and the HandoverCommadMessage is transmitted using the X2 interface, There is no problem.
  • Handover command message is transmitted to the terminal, there is essentially no problem.
  • the X2 interface is a logical interface between base stations. Note that just because the X2 interface is set does not mean that it is physically connected directly.
  • the RRC Connection Reconfiguration message is included in the DL-DCCH-Message.
  • the DL-DCCH-Message is transmitted from the E-UTRAN (base station) to the UE through the downlink logical channel DL DCCH.
  • the RRC Connection Reconfiguration message includes MobilityControlInfo IE. Also, settings such as SCell addition / deletion (or release) are included.
  • the RRC Connection Reconfiguration message is notified from the E-UTRAN (base station) to the UE (terminal).
  • MobilityControlInfo IE includes targetPhysCellId (target Physical Cell ID). In other words, this specifies a handover destination cell. Since this target cell becomes PCell, the base station notifies PCell. That is, the base station notifies the terminal of PCell setting / change. Note that the operation of the terminal when the target cell is specified is also defined.
  • RRC ConnectionReconfiguration includes settings such as SCell addition / deletion (or release). At this time, the SCell to be added / deleted (or released) is designated by a physical cell ID (Physical Cell ID).
  • the base station notifies the terminal of addition / deletion (or release) of SCell.
  • the operation at the time of handover is also specified.
  • movement is prescribed
  • 3GPP introduced scheduling from HSDPA (High-Speed Downlink Packet Access; W-CDMA Rel'5).
  • a wireless channel between base station terminals is not fixedly assigned to the terminal, but a method of sharing a wireless channel (wireless channel) between a plurality of terminals. It has been taken.
  • Scheduling methods include Max CIR method selected from terminals with high CIR (Carrier-to-Interference Ratio), proportional-fairness method that assigns radio resources fairly to each terminal based on radio channel quality (Radio Channel Quality), all terminals
  • the Round Robin method which allocates radio resources evenly, is famous.
  • the radio resource is composed of a spreading code and time.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • it is composed of subcarriers and time.
  • a shared channel is called a shared channel.
  • the method for transmitting data to the selected terminal for example, modulation scheme, coding rate, etc.
  • radio resources used for transmitting data are selected by scheduling (including these). Sometimes called scheduling).
  • control signal indicating the selected modulation scheme, coding rate, and radio resource is notified to the selected terminal prior to data transmission to the selected terminal, and the terminal is transmitted on the shared channel by following these control signals. Data can be received.
  • each terminal measures the pilot signal (or reference signal RS (Reference Signal)) transmitted from the base station, and the downlink radio channel quality (Downlink channel quality) obtained by calculating is the base station Will be notified.
  • the base station performs scheduling based on this, transmits a control signal related to downlink data transmission obtained by the scheduling to the terminal, and subsequently performs downlink data transmission.
  • uplink data transmission scheduling is performed based on uplink radio channel quality (Uplink channel quality) obtained by measuring and calculating a pilot (or reference signal) transmitted from each terminal.
  • Uplink channel quality uplink radio channel quality
  • a control signal related to uplink data transmission obtained by scheduling is transmitted to the terminal, and the terminal performs uplink data transmission based on this control signal.
  • Downlink radio control channel (PDCCH: Physical Downlink Control CHannel) that transmits control signals for data transmission using the downlink downlink shared data channel (PDSCH: Physical Downlink Shared CHannel) of PCell (Scheduling Cell) 2) PCell downlink shared data channel (PDSCH) that transmits downlink data by PCell using the control information transmitted by the downlink radio control channel. 3) A downlink radio control channel (PDCCH) that transmits a control signal for a downlink radio shared data channel (PDSCH: Physical Downlink Shared CHannel) of SCell (Non-scheduling Cell) is transmitted.
  • PDCCH Physical Downlink Control CHannel
  • SCell Non-scheduling Cell
  • the downlink radio control channel (PDCCH) and the downlink radio shared data channel (PDSCH) include control information indicating which CC is a SCell (Scheduling Cell).
  • Radio broadcast channel (PBCH: Physical Broadcast CHannel), radio synchronization signal (Physical Synchronisation Signal), radio control format indicator channel (PCFICH: Physical Control Format Indicator CHannel), radio H-ARQ indicator channel (PHICH: Physical Hybrid-ARQ Indicator CHannel) ) Is also transmitted on the downlink.
  • PCell Switchuling Cell
  • two downlink radio control channels PDCCH are transmitted.
  • a radio broadcast channel (PBCH: Physical Broadcast CHannel), a radio synchronization signal (Physical SynchronisationchronSignal), a radio control format indicator channel (PCFICH: Physical Control Format Indicator CHannel), a radio H-ARQ indicator channel (PHICH: Physical (Hybrid-ARQ (Indicator) CHannel) is also transmitted on the downlink.
  • PBCH Physical Broadcast CHannel
  • a radio synchronization signal Physical SynchronisationchronSignal
  • PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical (Hybrid-ARQ (Indicator) CHannel
  • SCell Non-scheduling Cell
  • PDSCH SCell downlink radio shared channel
  • PBCH Physical roadBroadcast CHannel
  • PBCH Physical roadBroadcast CHannel
  • a radio synchronization signal Physical Synchronisation ⁇ Signal
  • PCFICH Physical Control Format Indicator ⁇ CHannel
  • PHICH Physical ARQ Indicator CHannel
  • PDCCH downlink radio control channel
  • PCFICH radio control format indicator channel
  • PHICH radio H-ARQ indicator channel
  • PDCCH downlink radio control channel
  • Figure 5 shows the Cross-Carrier-Scheduling model.
  • there is one downlink radio control channel but actually, a downlink radio control channel is set for each CC. That is, the right diagram in FIG. Note that in the left diagram of FIG. 5, only the downlink radio control channel for one terminal is shown, but actually there are downlink radio control channels for other terminals.
  • PCell is described as Scheduling Cell and SCell is described as Non-scheduling Cell.
  • CA is implemented at 3CC or more.
  • FIG. 6 is a diagram illustrating a case where there are three CCs.
  • CA is performed in 3CC (that is, when there are a plurality of SCells)
  • Cross Carrier Scheduling may not be applied to all SCells. That is, the SCell may be a scheduling cell.
  • a certain SCell can be a Scheduling Cell for another SCell.
  • the base stations constituting the PCell can perform scheduling of SCell1 with the PCell itself, and the base stations constituting the SCell2 can also have a PDCCH for scheduling SCell2 itself and SCell3. is there.
  • the PCell schedules for the sake of simplicity, it means that the base stations constituting the PCell perform scheduling. The same applies to SCell.
  • Control signals for carrying out Cross Carrier Scheduling are defined in TS36.331V10.3.0.
  • Scheduling Cell is specified by Serving Cell ID.
  • Serving Cell ID 0
  • PCell becomes a Scheduling Cell.
  • restrictions are set in Cross Carrier Scheduling with TS36.300V10.5.0.
  • Scheduling Cell a cell that performs scheduling
  • Non-scheduling Cell a cell that does not perform scheduling
  • CC Non-scheduling Cell
  • CC Non-scheduling Cell
  • a cell ID is included in the downlink control channel PDCCH to indicate which cell (CC) the control channel is for.
  • This is TS36.212 5.3.3.1.1, 5.3.3.1.2, 5.3.3.1.3, 5.3.3.1.3A, 5.3.3.1.4A, 5.3.3.1.5, 5.3.3.1.5A, 5.3. It is specified in 3.1.5B, 5.3.3.1.5C, 5.3.3.1.8.
  • DCI Downlink Control Information
  • Carrier indicator that is, 3-bit information. These 3 bits correspond to 0 to 7 defined by ServCellIndex IE, that is, 3 bits.
  • DCI Format 1 is a control signal for the downlink shared channel PDSCH. DCI is transmitted on PDCCH.
  • the DCI is transmitted to the terminal through the downlink radio control channel PDCCH.
  • the downlink radio control channel PDCCH includes information indicating which CC (Cell) the control signal is for, and is transmitted to the terminal.
  • PCell can be interpreted as the main band (master band, main band) and SCell as the dependent band (slave band or extended band).
  • PCell is sometimes called an anchor component.
  • PCell becomes Scheduling Cell
  • SCell becomes Scheduling Cell or Non-scheduling Cell.
  • CC1 is PCell and scheduling Cell
  • CC2 is SCell and Non-scheduling Cell.
  • CC1 and CC2 are CCs (or cells) formed by the same base station eNB1 (e Node B1).
  • the necessity of changing PCell and SCell is judged based on the radio channel quality of PCell and SCell.
  • the base station may determine the necessity of changing the PCell and SCell according to the radio channel quality sent from the terminal UE.
  • a case of changing (exchange) of PCell and SCell will be described as an example.
  • PCell reception quality is better than SCell reception quality.
  • SCell or cell with better radio channel quality be PCell.
  • PCell and SCell change request it is determined that PCell and SCell need to be changed.
  • PCell and SCell change request the base station to change (exchange) the PCell and SCell.
  • the radio channel quality includes received power, and the determination may be performed based on the received power.
  • CC1 is PCell and CC2 is SCell, but it is required to change CC2 to PCell and CC1 to SCell.
  • the base station eNB that has received the request or the base station eNB that has decided to change it first notifies the terminal UE that the SCell is to be deleted (or released). That is, it notifies that the SCell communication is to be stopped (or interrupted).
  • the terminal UE that has received the notification deletes (or releases) the SCell, and continues communication with the base station eNB1 using only the PCell.
  • the base station eNB deletes (or releases) the SCell, and uses only the PCell for communication with the terminal UE.
  • the base station eNB notifies the terminal UE to perform a different frequency handover (hard handover) to CC2 (that is, the original SCell).
  • the terminal UE that has received the notification with the base station eNB performs a different frequency handover to CC2.
  • line connection is performed by performing random access (see TS36.300V 10.1.5.2 Non-contention based random access).
  • CC2 becomes PCell by handing over to CC2 (Because it is not connected to other CCs, it is necessarily PCell).
  • the base station eNB1 notifies the terminal of the addition of SCell (CC1) using CC2 (PCell).
  • Terminal UE1 which received notification with the base station eNB adds SCell (CC1).
  • FIG. 8 to FIG. 12 are diagrams for explaining the prior art. For the sake of simplicity, it is assumed that CC is implemented by 2CC, with CC1 as PCell and CC2 as SCell.
  • FIG. 8 is a block diagram of the base station
  • FIG. 9 is a block diagram of the terminal.
  • the base station eNB creates a pilot signal in the pilot signal creation unit 10 of the transmission unit 50a, and performs modulation in the encoding / modulation unit 11.
  • the pilot signal modulated in the transmission radio unit 12 of the transmission unit 50a is converted into a radio signal, and the pilot signal is transmitted via the antenna 13 using all CC (Component Carrier) or in all cells, the base station eNB It transmits to the subordinate at least one terminal UE.
  • CC Component Carrier
  • the pilot signal creation unit 10, the handover control signal creation unit 14, the signal creation unit of the band control signal creation unit 15, the encoding / modulation unit 11 and the transmission radio unit 12 are collectively referred to as a transmission unit 50a or a transmission unit.
  • the pilot signal is also called a pilot or a reference signal (RS).
  • the handover control signal creation unit 14 of the control unit 51a generates a control signal to be transmitted to the terminal UE in order to control handover.
  • the band control signal creation unit 15 of the transmission unit 50a generates a signal for controlling a band for communication with the terminal UE.
  • the terminal UE (see FIG. 9) that has received the pilot signal via the antenna 34 converts the radio signal into a baseband signal in the reception radio unit 25 of the reception unit 53a, and demodulates it in the demodulation / decoding unit 26.
  • the radio channel quality measurement and calculation unit 27 of the reception unit 53a extracts a pilot signal, and measures and calculates reception power and reception quality of the pilot signal.
  • the radio channel quality is measured in all CCs (cells). Specifically, it acquires pilot received power (RSRP: Reference Signal Received Power), pilot received quality (RSRQ: Reference Signal Received Quality), CIR (Carrier to Interference Ratio), SIR (Signal to Interference Ratio), etc. .
  • the obtained radio channel quality is determined by the radio channel quality information creation unit 37 based on a calculation formula or the like, and the measurement result is converted to a discrete numerical value, and the radio channel quality (Channel Q Quality) or radio channel quality index (CQI: Channel Q Quality Indicator ) Hereinafter, it is collectively referred to as wireless channel quality.
  • the obtained wireless channel quality is sent to the encoding / modulating unit 32 of the transmitting unit 55a.
  • the bandwidth control unit 35 of the control unit 54a controls the bandwidth used by the terminal UE for communication, and the terminal setting / transmission / reception control unit 36 controls transmission / reception processing of the terminal UE under the control of the bandwidth control unit 35.
  • the reception radio unit 25, demodulation / decoding unit 26, radio channel quality measurement and calculation unit 27, band control information extraction unit 28, and handover control signal extraction unit 29 are collectively referred to as a reception unit 53a or reception means.
  • the handover control signal extraction unit 29 extracts a signal for controlling handover from the base station eNB from the received signal.
  • the handover control unit 30 compares the channel quality of PCell and SCell based on the radio channel quality of all CCs (cells). Here, it is assumed that the radio channel quality of SCell (CC2) is better than the radio channel quality of PCell (CC1). At this time, the handover control unit 30 determines that the PCell and the SCell need to be changed, and determines that the handover is necessary to execute the change. Subsequently, the handover request signal creation unit 31 is notified of the determination result, and the handover request signal creation unit 31 creates a handover request signal.
  • the encoding / modulation unit 32 performs encoding, modulation, conversion to a radio signal by the transmission radio unit 33, and transmission to the base station eNB via the antenna.
  • the base station eNB that has received the handover request signal via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16, demodulates the signal in the demodulation / decoding unit 17, and decodes the signal as a reception signal. Reproduce.
  • the handover request signal extraction unit 18 extracts a handover request signal from the reproduced reception signal and notifies the handover control unit 19 of the handover request signal.
  • the handover control unit 19 that has received the notification requests the band control unit 20 to delete (or release) the SCell.
  • the band control unit 20 notifies the SCell deletion (or release) to the transmission radio unit 12, the reception radio unit 16, the encoding / modulation unit 11, the demodulation / decoding unit 17, and the band control signal creation unit 15.
  • the band control signal creation unit 15 sends a control signal (SCell deletion notification signal or SCell release notification) related to deletion (or release) of the SCell and deletion (or release) of the downlink radio control channel PDCCH transmitted by the PCell for the SCell. create.
  • the encoding / modulation unit 11 performs encoding, modulation, conversion to a radio signal by the transmission radio unit 12, and transmission to the terminal UE via the antenna 13.
  • the SCell deletion (or release) notification may be the above-described radio channel reconfiguration message (RRCConnectionReconfigurationRemessage).
  • the terminal UE and the base station eNB that have received the notification delete (or release) the SCell and delete (or release) the radio control channel for the SCell transmitted by the PCell.
  • the radio channels such as the downlink radio shared channel PDSCH, the uplink radio shared channel PUSCH, and the uplink radio control channel PUCCH used for communication with the terminal UE are also deleted (or released). To do.
  • a radio channel reconfiguration completion message (RRCConnectionReconfigurationComplete message) may be returned from the terminal UE to the base station eNB.
  • the terminal UE notifies the base station eNB of a handover failure (handover failure).
  • the terminal UE creates a signal, modulates it, converts it to a radio signal, and transmits it to the base station eNB, as described above. Moreover, in the base station eNB, it converts into a baseband signal, demodulates, and extracts a notification signal. In the future, similar processing will be omitted.
  • the handover control unit 19 of the base station eNB that recognizes that the deletion (or release) of the SCell has been completed controls the execution of the PCell different frequency handover (handover from CC1 to the original SCell (CC2)). Specifically, handover control information such as a handover destination and a handover timing is determined, and the handover control signal creation unit 14 is notified of the creation of the handover control control signal based on this. The handover control signal creation unit 14 creates a handover control signal based on the information and notifies the terminal UE.
  • the terminal UE and the base station eNB that have received the notification perform a hard handover of the PCell from CC1 to CC2 based on the handover control signal (handover control information).
  • the handover destination CC is specified by the targerPhysCellId included in MobilityControlInfo IE of TS36.331 6.3.4.
  • the terminal UE notifies the base station eNB of handover completion or failure in the same manner as SCell deletion (or release).
  • the base station eNB that has received the notification requests the bandwidth control unit 20 to add a SCell and set a downlink radio control channel for data transmission in the SCell transmitted in the SCell.
  • the band control signal creation unit 15 creates a control signal (SCell addition control signal) related to the addition of the SCell and the addition of the downlink radio control channel PDCCH transmitted in the SCell, and transmits the control signal to the terminal UE.
  • the terminal UE and the base station eNB that have received the notification add a SCell and add (set) a radio control channel for the SCell transmitted by the PCell.
  • SCell radio channels such as downlink radio shared channel PDSCH, uplink radio shared channel PUSCH, and uplink radio control channel PUCCH used for communication with terminal UE are also added (set).
  • the terminal UE notifies the base station eNB of the completion or failure of SCell deletion (or release) and SCell addition.
  • the terminal UE notifies the base station eNB of handover completion or failure in the same manner as SCell deletion (or release).
  • PCell and SCell are changed (exchanged).
  • the terminal requested required the different frequency handover for change of PCell and SCell in the above, you may judge a base station. The description will be made below except for the portions that overlap with the description when the above-mentioned terminal determines.
  • the terminal UE receives the pilot signal transmitted from the base station eNB, and measures the radio channel quality in the radio channel quality measurement and calculation unit 27.
  • the wireless quality measurement result is notified to the wireless channel quality information creation unit 37.
  • the radio channel quality information creating unit 37 sets the measurement result as a discrete numerical value based on a calculation formula or the like, and obtains radio channel quality (Channel Quality) or a radio channel quality index (CQI: Channel Quality Indicator). Hereinafter, it is collectively referred to as wireless channel quality.
  • the obtained radio channel quality is encoded and encoded by the encoding / modulation unit 32.
  • the transmission radio unit 33 converts the radio signal into a radio signal and transmits the radio signal to the base station eNB via the antenna 34.
  • the radio channel quality measured in all CCs (cells) may be transmitted only by PCell, or the radio channel quality may be transmitted by each measured CC (that is, PCell or SCell here).
  • the base station eNB that has received the radio channel quality via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16, demodulates it in the demodulation / decoding unit 17, and decodes the signal as a reception signal. Reproduce.
  • the radio channel quality information extraction unit 21 extracts radio channel quality from the reproduced received signal and notifies the band control unit 20 and the handover control unit 19 of the radio channel quality.
  • the handover control unit 19 compares the channel quality of the PCell and other SCells based on the radio channel quality for all CCs (or cells). Here, it is assumed that the radio channel quality of SCell (CC2) is better than the radio channel quality of PCell (CC1). At this time, the handover control unit 19 determines that a change (exchange) between the PCell and the SCell is necessary, and determines that a handover is necessary to execute the change (exchange). In consideration of control such as radio channel control, it is desirable that PCell reception quality is better than SCell reception quality. For this reason, it is judged that it is necessary to change PCell and SCell.
  • the bandwidth control unit 20 is notified of the change (exchange) of the PCell and the SCell.
  • the band control unit 20 notifies the SCell deletion (or release) to the transmission radio unit 12, the reception radio unit 16, the encoding / modulation unit 11, the demodulation / decoding unit 17, and the band control signal creation unit 15.
  • the band control signal creation unit 15 sends a control signal (SCell deletion notification signal or SCell release notification) related to deletion (or release) of the SCell and deletion (or release) of the downlink radio control channel PDCCH transmitted by the PCell for the SCell. create.
  • the encoding / modulation unit 11 performs encoding, modulation, conversion to a radio signal by the transmission radio unit 12, and transmission to the terminal UE via the antenna 13.
  • the SCell deletion (or release) notification may be the above-described radio channel reconfiguration message (RRCConnectionReconfigurationRemessage).
  • the terminal UE that has received the notification via the antenna 34 converts the radio signal into a baseband signal in the reception radio unit 25, demodulates and decodes the signal in the demodulation / decoding unit 26, and reproduces the signal as a reception signal.
  • the bandwidth control information extraction unit 28 extracts the notification and notifies the bandwidth control unit.
  • the bandwidth control unit that has received the notification deletes (or releases) the SCell, and deletes (or releases) the radio control channel for the SCell transmitted by the PCell.
  • the base station also deletes (or releases) the SCell, and deletes (or releases) the radio control channel for the SCell transmitted on the PCell.
  • the radio channels such as the downlink radio shared channel PDSCH, the uplink radio shared channel PUSCH, and the uplink radio control channel PUCCH used for communication with the terminal UE are also deleted (or released). To do.
  • a radio channel reconfiguration completion message (RRCConnectionReconfigurationComplete message) may be returned from the terminal UE to the base station eNB.
  • the terminal UE notifies the base station eNB of a handover failure (handover failure).
  • the terminal UE creates a signal, modulates it, converts it to a radio signal, and transmits it to the base station eNB, as described above. Moreover, in the base station eNB, it converts into a baseband signal, demodulates, and extracts a notification signal.
  • the bandwidth control unit 35 or the handover control unit 30 determines completion and failure, notifies the determination result to a control signal creation unit (not shown) such as completion and failure, and generates a control signal such as completion and failure that has received the notification.
  • the unit generates a control signal such as completion or failure, encodes and modulates the control signal such as completion or failure in the encoding / modulation unit 32, converts the signal to a radio frequency in the transmission radio unit 33, and then converts the signal through the antenna 34. Transmit to the base station.
  • the base station that has received a control signal such as completion or failure via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16, demodulates and decodes the signal in the demodulation / decoding unit 17, and receives the signal. Play as.
  • a control signal extraction unit such as completion and failure
  • a control signal such as completion and failure is extracted from the generated received signal and notified to the band control unit 20 and the handover control unit 19. Recognizing that the deletion (or release) of the SCell is completed, the handover control unit 19 of the base station eNB controls the execution of the PCell different frequency handover (handover from CC1 to the original SCell (CC2)).
  • handover control information such as a handover destination and a handover timing is determined, and the handover control signal creation unit 14 is notified of the creation of the handover control control signal based on this.
  • the handover control signal creation unit 14 creates a handover control signal based on the information and notifies the terminal UE.
  • the terminal UE and the base station eNB that have received the notification perform a hard handover of the PCell from CC1 to CC2 based on the handover control signal (handover control information).
  • the handover destination CC is specified by the targerPhysCellId included in MobilityControlInfo IE of TS36.331 6.3.4.
  • the terminal UE notifies the base station eNB of handover completion or failure in the same manner as SCell deletion (or release).
  • the base station eNB that has received the notification requests the bandwidth control unit 20 to add a SCell and set a downlink radio control channel for data transmission in the SCell transmitted in the SCell.
  • the band control signal creation unit 15 creates a control signal (SCell addition control signal) related to the addition of the SCell and the addition of the downlink radio control channel PDCCH transmitted in the SCell, and transmits the control signal to the terminal UE.
  • the terminal UE and the base station eNB that have received the notification add a SCell and add (set) a radio control channel for the SCell transmitted by the PCell.
  • SCell radio channels such as downlink radio shared channel PDSCH, uplink radio shared channel PUSCH, and uplink radio control channel PUCCH used for communication with terminal UE are also added (set).
  • the terminal UE notifies the base station eNB of the completion or failure of SCell deletion (or release) and SCell addition.
  • the terminal UE notifies the base station eNB of handover completion or failure in the same manner as SCell deletion (or release).
  • FIG. 10 and FIG. 11 are diagrams showing an operation image of PCell and SCell change in the prior art.
  • CC1 is PCell and CC2 is SCell.
  • the SCell is deleted (or released), and only PCell communication is performed.
  • the PCell CC1 is handed over to CC2 at a different frequency.
  • CC1 is added as a SCell.
  • a pilot signal is transmitted from the base station eNB to the terminal UE.
  • the terminal UE measures the radio channel quality and performs a radio channel quality report to the base station eNB.
  • the base station eNB performs PCell and SCell change determination.
  • a SCell deletion notification (or release notification) is sent to the terminal UE.
  • the SCell is deleted (or released), and a different frequency handover request is made from the base station eNB to the terminal UE.
  • This conventional different frequency handover is a hard handover in which the line is once disconnected and the frequency is changed, and then the line is reconnected. Accordingly, in order to reconnect the line, synchronization detection, random access, and the like are performed again.
  • a different frequency handover is performed from the PCell to the old SCell, and then the SCell to be added is selected by the base station eNB.
  • the base station eNB notifies which SCell is used as the new SCell, and SCell addition is performed.
  • the radio channel quality is measured in step S10, and cell selection of a cell to be PCell is performed in step S11.
  • step S12 a PCell / SCell change request is sent from the base station eNB.
  • step S13 the SCell is deleted (or released), and in step S14, a PCell different frequency handover is performed.
  • step S15 SCell is added and the process ends.
  • a component carrier is added / deleted (released) by carrier aggregation, and the information of addition / deletion (release) is notified to the terminal, or a component carrier based on quality information from the terminal by carrier aggregation. There is something to assign.
  • the conventional method has the following problems. -The different frequency handover is a hard handover, and the line needs to be disconnected and reconnected. ⁇ Those communicating with 2CC should be changed to 1CC. (That is, the state where communication was performed using two bands at the same time was changed to a state where communication was performed using only one band.)
  • a wireless communication apparatus capable of changing the PCell (first band) and SCell (second band) without reducing the transmission rate and without disconnecting the line.
  • a wireless communication apparatus includes first data, a first control signal for transmitting the first data, and a second data for second data transmitted in the second band.
  • a wireless communication apparatus that performs data transmission between wireless communication apparatuses by simultaneously using the first band for transmitting the control signal of 2 and the second band for transmitting the second data, line connection is established.
  • a band control unit that controls the change of the first band and the second band is maintained.
  • a wireless communication apparatus capable of changing the PCell (first band) and SCell (second band) without reducing the transmission speed and without disconnecting the line. can do.
  • FIG. 6 is a diagram (part 1) for explaining Carrier-Aggregation.
  • FIG. 6 is a diagram (part 2) for explaining Carrier-Aggregation.
  • FIG. 6 is a diagram (part 3) for explaining Carrier-Aggregation.
  • FIG. 6 is a diagram (part 4) for explaining Carrier-Aggregation.
  • FIG. 6 is a diagram (part 5) for explaining Carrier-Aggregation.
  • FIG. 6 is a diagram (part 6) for explaining Carrier-Aggregation.
  • FIG. 7 is a diagram (part 7) for explaining Carrier-Aggregation.
  • FIG. 6 is a diagram (part 1) for explaining a conventional technique.
  • FIG. 2 is a second diagram for explaining a conventional technique.
  • FIG. 4 is a diagram (part 3) for explaining a conventional technique.
  • FIG. 4 is a diagram (part 4) for explaining a conventional technique.
  • FIG. 5 is a diagram (part 5) for explaining a conventional technique;
  • FIG. 11 is a diagram (No. 1) illustrating an image of an operation when changing (exchanging) a Scheduling Cell and a Non-scheduling Cell.
  • FIG. 10 is a diagram (part 2) illustrating an image of an operation when changing (exchange) Scheduling Cell and Non-scheduling Cell. It is a figure explaining the image of PCell and SCell change processing of this embodiment. It is an image figure explaining the case where SCell * 1 (Scheduling * Cell) and SCell * 2 (Non-scheduling * Cell) are changed (exchange).
  • FIG. 3 is a diagram (part 1) illustrating a first configuration example of the present embodiment in more detail.
  • FIG. 5 is a diagram (part 2) illustrating the first configuration example of the embodiment in more detail.
  • FIG. 6 is a third diagram illustrating the first configuration example of the embodiment in more detail.
  • FIG. 4 is a diagram (part 4) illustrating the first configuration example of the embodiment in more detail.
  • FIG. 5 is a fifth diagram illustrating the first configuration example of the embodiment in more detail.
  • FIG. 6 is a sixth diagram illustrating the first configuration example of the embodiment in more detail.
  • FIG. 7 is a diagram (No. 7) for explaining the first configuration example of the embodiment in more detail;
  • FIG. 8 is a diagram (part 8) illustrating the first configuration example of the embodiment in more detail.
  • FIG. 8 is a diagram (part 8) illustrating the first configuration example of the embodiment in more detail.
  • FIG. 9 is a diagram (part 9) illustrating the first configuration example of the present embodiment in more detail
  • FIG. 10 is a diagram (No. 10) for explaining the first configuration example of the embodiment in more detail
  • FIG. 11 is a diagram (part 11) illustrating the first configuration example of the embodiment in more detail
  • FIG. 12 is a diagram (No. 12) for explaining the first configuration example of the embodiment in more detail
  • FIG. 14 is a diagram (No. 13) illustrating the first configuration example of this embodiment in more detail.
  • FIG. 14 is a diagram (No. 14) for explaining the first configuration example of the embodiment in more detail
  • FIG. 15 is a diagram (No. 15) illustrating the first configuration example of this embodiment in more detail
  • FIG. 16 is a diagram (No.
  • FIG. 16 illustrating the first configuration example of this embodiment in more detail
  • FIG. 17 is a diagram (No. 17) explaining the first configuration example of this embodiment in more detail
  • FIG. 18 is a diagram (No. 18) explaining the first configuration example of this embodiment in more detail
  • FIG. 19 is a diagram (19) illustrating the first configuration example of the embodiment in more detail
  • FIG. 5 is a diagram (part 1) illustrating a second configuration example of the embodiment.
  • FIG. 6 is a second diagram illustrating a second configuration example of the embodiment.
  • FIG. 10 is a third diagram illustrating the second configuration example of the embodiment.
  • FIG. 10 is a diagram (No. 4) for explaining the second configuration example of the embodiment.
  • FIG. 10 is a diagram (No. 5) explaining the second configuration example of the embodiment.
  • FIG. 10 is a diagram (No. 5) explaining the second configuration example of the embodiment.
  • FIG. 10 is a diagram (No. 7) explaining the second configuration example of the embodiment.
  • FIG. 10 is a diagram (part 1) illustrating a third configuration example of the embodiment.
  • FIG. 10 is a second diagram illustrating a third configuration example of the embodiment.
  • FIG. 10 is a third diagram illustrating the third configuration example of the embodiment.
  • FIG. 10 is a fourth diagram illustrating the third configuration example according to the embodiment;
  • FIG. 10 is a fifth diagram illustrating the third configuration example according to the present embodiment;
  • FIG. 6 is a sixth diagram illustrating the third configuration example according to the embodiment;
  • FIG. 10 is a diagram (part 1) illustrating a fourth configuration example of the embodiment.
  • FIG. 10 is a second diagram illustrating a fourth configuration example of the embodiment.
  • FIG. 10 is a third diagram illustrating the fourth configuration example of the embodiment.
  • Carrierg Aggregation in LTE-Advanced system will be described as an example.
  • the present invention is applicable to any wireless communication system that uses a plurality of bands simultaneously.
  • the base station eNB determines whether to change the PCell or SCell based on the radio channel quality notified from the terminal, and notifies the previous band (CC, cell) and the change timing thereof. That is, the cell (or cell ID) to be PCell is notified. Furthermore, a cell (or cell ID) to be a SCell is notified along with the change.
  • the terminal UE that has received the notification changes as follows according to the notified timing.
  • (1) -The original SCell (CC2) is changed to the new PCell (CC2), and then the original PCell (CC1) is changed to the new SCell (CC1).
  • (2) -The original PCell (CC1) is changed to the new SCell (CC1), and then the original SCell (CC2) is changed to the new PCell (CC2).
  • (3) -The original SCell (CC2) is changed to the new PCell (CC2), and at the same time, the original SCell (CC2) is changed to the new PCell (CC2). That is, PCell and SCell are changed sequentially or simultaneously. This can be done simply by changing the PCell and SCell settings. It should be changed so that PCell always exists at a certain moment.
  • the PCell, the SCell, and the terminal UE maintain the line. That is, by continuing data transmission, a reduction in transmission speed is prevented.
  • the case of (1) will be described. However, the same processing is possible for the cases of (2) and (3) unless otherwise noted.
  • PCell is a Scheduling Cell
  • SCell is a Non-scheduling Cell.
  • the base station eNB uses the downlink radio control channel PDCCH transmitted in the original PCell (CC1) to notify the terminal UE that the PCell and SCell are changed and the original SCell (CC2) is changed to the new PCell (CC2). .
  • the terminal UE and the base station eNB change the original SCell (CC2) to the new PCell (CC2), and change the downlink radio control channel PDCCH from the original PCell (CC1) to the new PCell (CC2) (replay).
  • the terminal UE is notified to change the original PCell (CC1) to the new SCell (CC1) using the downlink radio control channel PDCCH transmitted in the new PCell (CC2).
  • the terminal UE and the base station eNB that have received the notification change the PCell (CC1) to the new SCell (CC1).
  • the source PCell changes from Scheduling Cell to Non-scheduling Cell
  • the source SCell changes from Non-scheduling Cell to Scheduling Cell
  • the base station eNB transmits the downlink radio control channel PDCCH or downlink radio shared data channel (PDSCH) transmitted by the original PCell (CC1). ) To notify the terminal UE that the original SCell is changed to scheduling ⁇ Cell. The terminal UE and the base station eNB that have received this change (reset) the downlink radio control channel PDCCH for the original SCell that was transmitted by the original PCell (CC1) to be transmitted by the original PCell. ). That is, it changes to Scheduling Cell.
  • PDCCH downlink radio control channel
  • PDSCH downlink radio shared data channel
  • the base station eNB uses the downlink radio control channel PDCCH or downlink radio shared data channel (PDSCH) transmitted in the original PCell (CC1) and / or the original SCell (CC2) to change the PCell and SCell to the terminal UE.
  • PDCCH downlink radio control channel
  • PDSCH downlink radio shared data channel
  • the terminal UE and the base station eNB that have received the notification change the original SCell (CC2) to the new PCell (CC2). Subsequently, the terminal UE is notified of changing the original PCell (CC1) to the new SCell (CC1) using the downlink radio control channel PDCCH or the downlink radio shared data channel (PDSCH) transmitted in the original PCell (CC1).
  • the terminal UE is notified of changing the original PCell (CC1) to the new SCell (CC1) using the downlink radio control channel PDCCH or the downlink radio shared data channel (PDSCH) transmitted in the original PCell (CC1).
  • PDCCH downlink radio control channel
  • PDSCH downlink radio shared data channel
  • PDCCH downlink radio control channel
  • PDSCH downlink radio shared data channel
  • the terminal UE and the base station eNB change so that the radio control channel PDDCH for the new SCell transmitted in the new SCell (CC1) is transmitted in the new PCell.
  • the PCell and SCell and the terminal UE maintain the line. That is, by continuing data transmission, a reduction in transmission speed is prevented.
  • the source SCell is changed from Non-scheduling Cell to Scheduling Cell
  • the PCell and SCell are changed
  • the changed (target) SCell is changed from Scheduling Cell to Non-scheduling Cell .
  • FIG. 13 and FIG. 14 are diagrams showing an image of the operation when changing (exchange) the Scheduling ⁇ Cell and the Non-scheduling Cell.
  • PCell and SCell-1 are Scheduling Cell and SCell-2 is Non-scheduling Cell.
  • Scheduling Cell is changed to PCell and SCell 2.
  • FIG. 15 is a diagram illustrating an image of the PCell / SCell change process according to the present embodiment.
  • CC1 is a PCell and Scheduling Cell
  • CC2 is SCell1 and Scheduling Cell
  • CC3 is SCell2 and Non-scheduling Cell.
  • SCell 2 is changed to Scheduling Cell
  • SCell 1 is changed to Non-scheduling Cell. This can be done by changing the information included in the cell to set which cell is the scheduling cell.
  • PCell Since PCell must exist, PCell exists separately at the time of the above change, and is not subject to change.
  • SCell-1 (Scheduling Cell)
  • SCell-2 Non-scheduling Cell
  • FIG. 16 is an image diagram illustrating a case where SCell-1 (Scheduling-Cell) and SCell-2 (Non-scheduling-Cell) are changed (exchanged).
  • FIG. 16 shows a case where the change is performed in three steps.
  • CC1 is a scheduling cell in PCell
  • CC2 is a scheduling cell in SCell1
  • CC3 is a non-scheduling cell in SCell2.
  • SCell 2 is changed from a non-scheduling cell to a scheduling cell using the control signal of SCell 2 transmitted in SCell 1 ((2) in FIG. 16).
  • SCell 1 is changed to a non-scheduling cell using a control signal transmitted in SCell 2 or a control signal transmitted in SCell 1.
  • SCell 1 (Scheduling cell) and SCell 2 (Non-scheduling) are changed to SCell 1 (Non-scheduling Cell) and SCell 2 (Scheduling Cell) ((3) in FIG. 16).
  • PCell Since PCell must exist, PCell exists separately at the time of the above change, and is not subject to change.
  • the downlink control channel contains a radio layer control signal
  • the downlink radio shared data channel contains a higher layer control signal.
  • PCell and SCell setting information is included in the data channel control signal. Therefore, the change of PCell and SCell can be realized by rewriting the setting of the control signal in the higher layer of the radio layer.
  • the setting of SchedulingulCell and Non-scheduling Cell is indicated by whether or not the control channel is actually placed on a certain Cell.
  • the modulation method of the control channel is determined in advance, and any mobile terminal can demodulate with the determined method, and the information of other mobile terminals can also be demodulated. Only information can be decrypted. Based on the decoded control information, the data channel modulation scheme and timing are acquired to obtain data.
  • the measurement of the radio channel quality may measure only the band (or cell) that is used, or may measure the entire band including the band (or cell) that is not being used.
  • the measurement result is transmitted using an uplink control channel.
  • the radio channel quality may be transmitted using the uplink PCell or SCell uplink control channel corresponding to the downlink PCell or SCell, or aggregated and transmitted to the uplink PCell uplink control channel corresponding to the downlink PCell. May be.
  • 17 to 35 are diagrams for explaining the first configuration example of the present embodiment in more detail.
  • CC1 is PCell
  • CC2 is SCell
  • CA is being performed in 2CC.
  • FIG. 17 is an operation image of the first configuration example
  • FIG. 18 is a diagram showing how PDCCH and PDSCH are transmitted in FIG.
  • CC1 is a PCell and Scheduling Cell
  • CC2 is a SCell and Non-scheduling Cell. Therefore, PCell and SCell are changed (exchanged).
  • CC1 is a SCell and a non-scheduling cell.
  • CC2 is assumed to be PCell and Scheduling Cell.
  • CC1 is a scheduling cell in PCell and has PDCCH and PDSCH
  • CC2 is a non-scheduling cell in SCell and has PDSCH.
  • SCell is changed to PCell
  • PCell is changed to SCell
  • PDCCH is replaced.
  • CC2 is a PCell, becomes a Scheduling Cell, and has PDCCH and PDSCH.
  • the first band is the primary cell and the second band is the secondary cell on the upper side (that is, earlier in time). This is because the first band is the secondary cell and the second band is the primary cell on the lower side (ie, later in time) due to the change in PCell and SCell.
  • the first band is a Primary Cell
  • the second band is a Secondary Cell
  • the third band is also a Secondary Cell
  • the Primary Cell and the second band of the first band Change the setting of the secondary cell of the band.
  • the first and third bands are secondary cells
  • the second band is a primary cell.
  • the bands are written adjacent (or continuous) for simplicity, but may not be adjacent (or continuous).
  • FIG. 21 is a block configuration diagram of the base station of the present embodiment.
  • FIG. 22 is a block configuration diagram of a terminal according to the present embodiment.
  • the base station eNB creates a pilot signal in the pilot signal creation unit 10 and performs modulation in the encoding / modulation unit 11.
  • the pilot signal modulated in the transmission radio unit 12 is converted into a radio signal, and the pilot signal is transmitted via the antenna 13 to at least one terminal UE under the base station eNB via all CCs (Component Carrier).
  • the pilot signal creation unit 10, the signal creation unit of the band control signal creation unit 15, the encoding / modulation unit 11, and the transmission radio unit 12 are collectively referred to as a transmission unit 50 or a transmission unit.
  • the pilot signal is also referred to as a pilot or a reference signal (RS: “Reference” Signal).
  • the terminal UE that has received the pilot signal via the antenna 34 converts the radio signal into a baseband signal in the reception radio unit 25 and demodulates it in the demodulation / decoding unit 26.
  • the radio channel quality measurement and calculation unit 27 extracts a pilot signal, and measures and calculates the reception power and reception quality of the pilot signal. Similarly, the radio channel quality is measured in all CCs. Specifically, information such as pilot received power (RSRP: Reference Signal Received Power), pilot received quality (RSRQ: Reference Signal Received Quality), CIR (Carrier to Interference Ratio), SIR (Signal to Interference Ratio), etc. obtain.
  • the reception radio unit 25, the demodulation / decoding unit 26, the radio channel quality measurement and calculation unit 27, and the band control information extraction unit 28 are collectively referred to as a reception unit 53 or a reception unit.
  • the bandwidth control unit 35 is notified of the measured and calculated wireless channel quality.
  • the bandwidth control unit 35 compares the channel quality of PCell and other SCells based on the radio channel quality for all CCs. Here, it is assumed that the radio channel quality of SCell (CC2) is better than the radio channel quality of PCell (CC1). At this time, the bandwidth control unit 35 determines that it is necessary to change (exchange) the PCell and the SCell. Subsequently, this determination result is notified to the PCell and SCell change request signal creation unit 41.
  • the PCell / SCell change signal creation unit 41 creates a PCell / SCell change request signal, and the encoding / modulation unit 32 encodes and modulates it.
  • the bandwidth control unit 35 notifies the terminal setting / transmission / reception control unit 36 of a bandwidth setting instruction. As a result, the bandwidth used for communication is changed.
  • the band control unit 35 and the terminal setting / transmission / reception control unit 36 are collectively referred to as a control unit 54 or a control unit.
  • the base station eNB that has received the PCell and SCell change request signal via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16 and demodulates it in the demodulation / decoding unit 17.
  • the signal is reproduced as a received signal by decoding.
  • the PCell / SCell change request signal extraction unit 40 extracts the PCell / SCell change request signal from the reproduced received signal, and notifies the bandwidth control unit 20 of the PCell / SCell change request signal extraction unit 40.
  • the reception radio unit 16, the demodulation / decoding unit 17, the radio channel quality information extraction unit 21, and the PCellSCell change request signal extraction unit 40 are collectively referred to as a reception unit 52 or a reception unit.
  • the bandwidth control unit 20 Upon receiving the notification, the bandwidth control unit 20 sends a PCell and SCell change request to the transmission radio unit 12, the reception radio unit 16, the encoding / modulation unit 11, the demodulation / decoding unit 17, and the band control signal creation unit 15. Notice. Note that the change request and the change timing may be notified at the same time. Moreover, you may change PCell and SCell simultaneously.
  • the bandwidth control unit 20 is referred to as a control unit 51 or control means.
  • the band control signal creation unit 15 creates a control signal related to the PCell change and the SCell change.
  • the transmission radio unit 12, the encoding / modulation unit 11, the band control signal creation unit 15, and the pilot signal creation unit 10 are collectively referred to as a transmission unit 50 of the base station eNB.
  • the transmission radio unit 33, the encoding / modulation unit 32, the PCell, the SCell change request signal creation unit 41, and the radio channel quality information creation unit 37 are collectively referred to as a transmission unit 55 of the terminal UE.
  • change a PCell to a SCell change one of the SCells to a PCell, and create a control signal related to the change timing.
  • it may be a control signal such as switching the Cell ID of the PCell and the Cell ID of the SCell, or the Cell ID of the original SCell is specified as the Cell ID of the PCell, and the original PCell is specified as the Cell ID of the SCell.
  • It may be a control signal such as designating the Cell ID of
  • the control signal for PCell and SCell change created as described above is encoded and modulated in the encoding / modulation unit 11. In the transmission radio unit 12, this is converted into a radio signal and transmitted to the terminal UE via the antenna 13.
  • the SCell deletion (or release) notification may be the above-described radio channel reconfiguration message (RRCConnectionReconfiguration message) (that is, the control signal for SCell deletion (or release) is included in the radio channel cross-configuration message. It may be a control signal).
  • the terminal UE and the base station eNB that have received the notification change the PCell and SCell. That is, the terminal UE that has received the notification via the antenna 34 converts the radio signal into a baseband signal in the reception radio unit 25, demodulates it in the demodulation / decoding unit 26, and reproduces the signal as a reception signal by decoding. To do.
  • the bandwidth control information extraction unit 28 extracts the notification and notifies the bandwidth control unit.
  • the bandwidth control unit that has received the notification deletes (or releases) the SCell, and deletes (or releases) the radio control channel for the SCell transmitted by the PCell.
  • the base station also deletes (or releases) the SCell, and deletes (or releases) the radio control channel for the SCell transmitted on the PCell. As the SCell is deleted (or released), the radio channels such as the downlink radio shared channel PDSCH, the uplink radio shared channel PUSCH, and the uplink radio control channel PUCCH used for communication with the terminal UE are also deleted (or released). To do.
  • a radio channel reconfiguration completion message (RRCConnectionReconfigurationComplete message) may be returned from the terminal UE to the base station eNB.
  • the terminal UE may notify the base station eNB of the failure to set up the radio channel.
  • the terminal UE creates a signal, modulates it, converts it to a radio signal, and transmits it to the base station eNB, as described above. Moreover, in the base station eNB, it converts into a baseband signal, demodulates, and extracts a notification signal.
  • the bandwidth control unit 35 determines completion and failure, notifies the determination result to a control signal creation unit (not shown) such as completion and failure, and the control signal creation unit such as completion and failure that has received the notification Create a control signal for failure, etc., encode and modulate the control signal for completion or failure in the encoding / modulation unit 32, convert it to a radio frequency in the transmission radio unit 33, and transmit it to the base station via the antenna 34 .
  • the base station that has received a control signal such as completion or failure via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16, demodulates and decodes the signal in the demodulation / decoding unit 17, and receives the signal. Play as.
  • a completion / failure control signal extraction unit (not shown) extracts a completion / failure control signal from the received signal and notifies the bandwidth control unit 20 of it. In the future, description of similar processing will be omitted.
  • the PCell and SCell can be changed (exchanged).
  • the base station eNB and the terminal UE have been described above as examples, the base station eNB and the relay (RN: Relay Node or RS: Relay Station) or the relay RN and the terminal UE may be used.
  • the base station eNB may be a small base station called a femto cell (HeNB: Home eNB).
  • FIG. 23 is a schematic flowchart of the present embodiment. This flow shows the entire processing performed between the terminal and the base station (hereinafter the same).
  • step S20 the radio channel quality is measured at the terminal.
  • step S21 a cell to be PCell is selected by the terminal.
  • step S22 the terminal or base station makes a PCell / SCell change request.
  • step S23 the base station performs PCell and SCell change control.
  • step S24 the PCell / SCell change is also completed in the terminal.
  • a pilot signal is transmitted from the base station to the terminal.
  • the radio channel quality is measured.
  • the PCell / SCell change determination is performed from the measured wireless channel quality.
  • the PCell and SCell change determination is performed by the terminal, but the base station may obtain the radio channel quality from the terminal and perform the determination.
  • PCell / SCell change request is issued
  • PCell / SCell change control is performed in the base station.
  • the PCell and SCell change notification is made from the base station to the terminal.
  • both the base station and the terminal change PCell to SCell and SCell to PCell. At this time, since the process is performed while the wireless line is maintained, the line is not disconnected.
  • RS Packet
  • a common pilot transmitted by a base station to a terminal a common pilot (pilot) or a cell-specific pilot for one or more terminals existing in a cell constituting the base station)
  • Cell specific specific pilot or cell specific specific RS dedicated pilot
  • UE specific specific pilot or UE specific specific pilot a pilot or terminal specific pilot (UE specific specific pilot or UE specific specific pilot) that is transmitted only to one terminal existing in a cell configured by the base station
  • pilot signal is mapped to a pilot channel, mapped to a predetermined radio resource as a radio signal, or mapped to a frame format and transmitted.
  • pilot channel In the LTE system, there is no pilot channel, it is defined as a physical signal (Physical signal), and is mapped to a radio frame format and transmitted in the same manner as the control channel and data channel (shared channel).
  • the terminal that has received the pilot signal transmitted from the base station via the antenna measures the radio channel quality according to the flow shown in FIG. 26 or FIG. 27, for example.
  • the radio channel quality includes RSRP, RSRQ, SNR (Signal to Noise Ratio), SIR (Signal to Interference Ratio), CQI, and the like.
  • 26 and 27 show RSRP as an example.
  • the CQI is converted (calculated) into discrete numerical values based on the radio channel quality.
  • RSRQ, SIR, etc. are calculated from the measured received signal power and noise power.
  • radio channel quality measurement for PCell and the radio channel quality measurement for SCell are preferably performed simultaneously, but may not be performed simultaneously.
  • radio channel quality information calculated based on the measured radio channel quality or converted into a discrete value is used as the radio channel quality information.
  • FIG. 28 shows a case where the wireless quality measurement is performed only for PCell and one SCell.
  • FIG. 28 measures the radio channel quality of PCell and SCell.
  • a change determination is made based on at least the PCell and SCell radio channel quality.
  • the radio channel quality (or radio channel quality information) of SCell is compared with the radio channel quality (or radio channel quality information) of PCell, and if the former is good, it is determined that it is necessary to change PCell and SCell.
  • parameters to prevent other factors for example, cell priorities and changes
  • cell priorities and changes from occurring frequently in the PCell radio channel quality (or radio channel quality information) and SCell radio channel quality (or radio channel quality information). Etc.
  • the SCell with the best radio channel quality may be selected and changed. Thereafter, the same processing as in the case of one SCell is performed.
  • the terminal that determines that the PCell and SCell need to be changed creates a PCell and SCell change request signal and notifies the base station.
  • the PCell / SCell change request signal is encoded and mapped to a radio channel (radio control channel or radio shared channel). Then, after modulation, the signal is converted into a radio frequency (converted into a radio signal), and after amplification, transmitted to the terminal via the antenna.
  • a radio channel radio control channel or radio shared channel
  • the signal is converted into a radio frequency (converted into a radio signal), and after amplification, transmitted to the terminal via the antenna.
  • encoding there are two possible cases: encoding after mapping to a radio channel and mapping to a radio channel after encoding.
  • the base station receives a radio channel via an antenna, amplifies it, converts it to a baseband signal, demodulates and decodes it, and uses the obtained signal to make a PCell / SCell change request. Extract the signal.
  • PCell PCell
  • SCell change request signal if the base station decides to change, it will be a PCell
  • SCell change notification signal or a change control signal, even if no change is required
  • the PCell / SCell change control signal created as described above is encoded and mapped to a radio channel (radio control channel or radio shared channel) as shown in FIG. 31, and after modulation, converted to a radio frequency. (Wireless signal) and transmitted to the terminal via the antenna.
  • a radio channel radio control channel or radio shared channel
  • the change control signal for PCell may be transmitted using a radio channel transmitted by PCell, and the change control signal for SCell may be transmitted using a radio channel transmitted by at least one SCell. Further, the change control signal for PCell and SCell may be transmitted using a radio channel transmitted by PCell or SCell. That is, it may be transmitted in a certain cell.
  • the change control signal is received by the terminal as shown in FIG. 32, for example. Subsequently, the PCell and SCell are changed according to the extracted change control signal. Similarly, the base station also changes.
  • the change may be performed simultaneously in the terminal and the base station based on the change timing included in the change control signal.
  • FIG. 25 is a detailed flowchart of pilot signal transmission processing of the base station of FIG.
  • RS Reference Signal; Pilot
  • step S31 the RS is mapped to a radio channel or a predetermined radio resource.
  • step S32 the mapped RS is modulated, and in step S33, radio signal conversion (frequency conversion (up-conversion)) is performed.
  • step S34 the radio signal is amplified, and in step S35, it is transmitted from the antenna.
  • step S40 PCell and SCell, or RS (Pilot) of PCell, SCell, and another Cell are received.
  • step S41 RS is demodulated.
  • step S42 wireless channel quality measurement and calculation are performed. Radio channel quality includes the aforementioned RSRP, RSRQ, SIR, and the like.
  • step S43 PCell and SCell, or RS of PCell, SCell, and another Cell are received by the antenna.
  • RS is amplified
  • step S45 baseband signal conversion (frequency conversion (down-conversion))
  • step S46 RS is demodulated.
  • step S47 wireless channel quality measurement and calculation are performed.
  • FIG. 28 is a flowchart of the PCell / SCell change determination process of FIG.
  • radio channel quality information for example, RSRP
  • step S51 it is determined whether the RSRP of the SCell is larger than the RSRP of the PCell (quality is good). If the determination in step S51 is no, the process proceeds to step S50. If the determination in step S51 is yes, a PCell / SCell change request signal is created in step S52.
  • FIG. 29 is a flowchart of the transmission process of the PCell / SCell change request signal in FIG.
  • a PCell / SCell change request signal is created and encoded in step S54.
  • this is mapped to a radio channel, modulated in step S56, and converted into a radio signal (frequency conversion (up-conversion)) in step S57.
  • the radio signal is amplified and transmitted from the antenna in step S59.
  • FIG. 30 is a flowchart of the reception process of the PCell / SCell change request signal in FIG.
  • step S60 the radio channel is received via the antenna, and in step S61 it is amplified.
  • step S62 this is converted into a baseband signal (frequency conversion (down-conversion)), demodulated in step S63, decoded in step S64, and PCell and SCell change request signals are extracted in step S65.
  • step S60 the radio channel is received via the antenna, and in step S61 it is amplified.
  • step S62 this is converted into a baseband signal (frequency conversion (down-conversion)), demodulated in step S63, decoded in step S64, and PCell and SCell change request signals are extracted in step S65.
  • baseband signal frequency conversion (down-conversion)
  • FIG. 31 is a flowchart of the PCell / SCell change notification transmission process of FIG.
  • step S70 a PCell / SCell change notification signal is created.
  • step S71 encoding is performed, in step S72, this is mapped to a radio channel, modulation is performed in step S73, and radio signal conversion (frequency conversion (up-conversion)) is performed in step S74. This is amplified in step S75, and transmitted from the antenna in step S76.
  • FIG. 32 is a flowchart of the PCell / SCell change notification reception process in FIG.
  • step S77 the PCell / SCell change notification radio channel is received via the antenna, and is amplified in step S78.
  • step S79 this is converted into a baseband signal (frequency conversion (down-conversion)), demodulated in step S80, and decoded in step S81.
  • step S82 a PCell / SCell change notification signal is extracted.
  • FIG. 33 to 35 are process flowcharts of the PCell and SCell change control and notification in FIG.
  • FIG. 33 shows a case in which SCell change notification is notified by SCell.
  • FIG. 34 shows a case where a PCell change notification is notified by PCell.
  • FIG. 35 shows a case where a PCell or SCell change notification is sent by PCell or SCell.
  • step S95 a control signal for changing SCell to PCell is created.
  • step S96 the control signal is encoded, mapped to a radio channel in step S97, and modulated in step S98.
  • step S99 this is converted into a radio signal (frequency conversion (up-conversion)), amplified in step S100, and transmitted from the antenna in step S101.
  • step S105 a control signal for changing PCell to SCell is created. This is encoded in step S106, mapped to a radio channel in step S107, and modulated in step S108.
  • step S109 the signal is converted into a radio signal (frequency conversion (up-conversion)), amplified in step S110, and transmitted from the antenna in step S111.
  • step S115 a control signal for changing SCell to PCell is created.
  • step S116 a control signal for changing PCell to SCell is created.
  • step S117 and step S117a are encoded in step S117 and step S117a, and mapped to a radio channel in step S118.
  • step S117 only one encoding unit may be provided and each control signal may be encoded, or two encoding units may be provided and encoded in parallel as in step S117a. .
  • This is modulated in step S119, converted into a radio signal (frequency conversion (up-conversion)) in step S120, amplified in step S121, and transmitted from the antenna in step S122.
  • 36 to 42 are diagrams illustrating a second configuration example of the present embodiment.
  • the terminal UE determines the necessity of changing the PCell and the SCell, and notifies the base station eNB of the PCell and SCell change request.
  • the base station eNB determines the necessity of changing the PCell and the SCell based on the radio channel quality measured by the terminal UE and reported (notified) to the base station eNB.
  • FIG. 36 is a block diagram of the base station.
  • FIG. 37 is a block diagram of a terminal. 36, the same reference numerals are given to the same components as those in FIG. In FIG. 37, components similar to those in FIG. 22 are denoted by the same reference numerals.
  • the terminal UE receives the pilot signal transmitted from the base station eNB, and measures the radio channel quality in the radio channel quality measurement and calculation unit 27. Note that only PCell and SCell may be measured, or all CCs transmitted by the base station eNB (that is, CCs other than PCell and SCell) may be measured.
  • the wireless quality measurement result is notified to the wireless channel quality information creation unit 37.
  • the radio channel quality information creating unit 37 sets the measurement result as a discrete numerical value based on a calculation formula or the like, and obtains radio channel quality (Channel Quality) or a radio channel quality index (CQI: Channel Quality Indicator). Hereinafter, it is collectively referred to as wireless channel quality.
  • the obtained radio channel quality is encoded / modulated by the encoding / modulation unit 32, converted into a radio signal by the transmission radio unit 33, and transmitted to the base station eNB via the antenna.
  • the radio channel quality measured in all CCs may be transmitted only by PCell, or the radio channel quality may be transmitted by the measured CC.
  • the base station eNB that has received the radio channel quality via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16, demodulates and decodes the signal in the demodulation / decoding unit 17 as a received signal Reproduce.
  • the radio channel quality information extracting unit 21 extracts at least the PCell and SCell radio channel quality from the reproduced received signal and notifies the bandwidth control unit 20 of the extracted radio channel quality.
  • the bandwidth control unit 20 compares the radio channel quality of PCell and other SCells based on at least the radio channel quality of PCell and SCell.
  • the radio channel quality of SCell CC2
  • the radio channel quality of PCell CC1
  • the bandwidth control unit 20 determines that it is necessary to change (exchange) the PCell and the SCell.
  • Other operations are the same as those in the first configuration example.
  • the terminal that has measured and calculated the radio channel quality notifies the base station of the calculated radio channel quality information.
  • the radio channel quality information is a value calculated based on the measured radio channel quality or a discrete value as described above.
  • This radio channel quality information is encoded in the same way as when sending a change control (notification) signal in FIGS. 33 to 35, mapped to an uplink control channel, modulated, converted into a radio signal, converted to a radio signal, and sent to a base station via an antenna. Send.
  • the radio channel quality information may be transmitted only by PCell or SCell, or may be transmitted by PCell and SCell.
  • the base station that has received the radio channel quality information from the terminal compares the radio channel quality of the PCell and other SCells based on at least the radio channel quality of the PCell and SCell.
  • the radio channel quality of SCell CC2
  • the radio channel quality of PCell CC1
  • the bandwidth control unit 20 determines that it is necessary to change (exchange) the PCell and the SCell.
  • the operation after the determination is the same as that in the first configuration example.
  • FIG. 39 is a flowchart of radio channel quality information transmission processing.
  • step S130 radio channel quality information is created.
  • step S131 the radio channel quality information is encoded, mapped to a radio channel in step S132, and modulated in step S133.
  • step S134 this is converted into a radio signal (frequency conversion (up-conversion)), amplified in step S135, and transmitted from the antenna in step S136.
  • FIG. 40 is a flowchart of another example of transmission processing of wireless channel quality information.
  • step S137 PCell wireless channel quality information is created.
  • step S138 SCell radio channel quality information is created. These are encoded in step S139 and step S139a, and mapped to a radio channel in step S140.
  • step S139 For the encoding in step S139, only one encoding unit may be provided and each control signal may be encoded, or two encoding units may be provided and encoded in parallel as in step S139a.
  • This is modulated in step S141, converted into a radio signal (frequency conversion (up-conversion)) in step S142, amplified in step S143, and transmitted from the antenna in step S144.
  • FIG. 41 is a flowchart of radio channel quality information reception processing in the base station.
  • the wireless channel is received via the antenna and amplified in step S146.
  • this is converted into a baseband signal (frequency conversion (down-conversion)), demodulated in step S148, and decoded in step S149.
  • radio channel quality information is extracted.
  • the base station performs a change determination based on at least the PCell and SCell radio channel quality notified from the terminal. For example, compare SCell's radio channel quality (or radio channel quality information) with PCell's radio channel quality (or radio channel quality information), and if the former is good, determine that it is necessary to change PCell and SCell. .
  • other factors for example, cell priority and change to prevent frequent occurrence of cell priorities and changes
  • the change determination may be performed in consideration of parameters and the like.
  • the determination is performed in the same manner as in the case of one SCell, such as selecting the SCell having the best radio channel quality. Thereafter, the same processing as in the case of one SCell is performed.
  • PCell, SCell change request signal is encoded, mapped to a radio channel (radio control channel or radio shared channel), modulated, converted to radio frequency (radio signal), and sent to the terminal via an antenna Sent.
  • radio channel radio control channel or radio shared channel
  • mapping to a radio channel there are two possible cases: encoding after mapping to a radio channel and mapping to a radio channel after encoding.
  • FIG. 42 is a flowchart of the PCell / SCell change determination process in FIG.
  • radio channel quality information for example, RSRP
  • step S152 it is determined whether the RSRP of the SCell is larger than the RSRP of the PCell (quality is good). If the determination in step S152 is no, the process proceeds to step S151. If the determination in step S152 is Yes, a PCell / SCell change request signal is created in step S153.
  • 43 to 48 are diagrams for explaining a third configuration example of the present embodiment.
  • the PCell and the SCell are changed simultaneously or sequentially, regardless of whether the Cross Carrier Scheduling is performed.
  • the third configuration example when Cross Carrier Scheduling is being performed, all cells or SCells to be changed to PCell are changed from Non-scheduling Cell to Scheduling Cell, and then PCell and SCell are changed simultaneously. Or execute sequentially.
  • the cell (or CC) to be changed is changed from Non-scheduling Cell to Scheduling Cell in the process of change.
  • CC1 is a PCell and scheduling cell
  • CC2 is a SCell and non-scheduling cell.
  • SCell is changed to Scheduling Cell. That is, the PDCCH of SCell is transmitted by SCell.
  • both CC1 and CC2 are Scheduling Cell.
  • change (exchange) the settings of PCell and SCell.
  • CC1 becomes SCell and CC2 becomes PCell. Up to this point, the processing may be terminated, but in order to return to Cross ⁇ Carrier Scheduling, SCell (CC1) is changed to Non-scheduling Cell. That is, the PDCCH for SCell is transmitted by PCell.
  • CC1 becomes Non-scheduling Cell in SCell
  • CC2 becomes Scheduling Cell in PCell.
  • (1) to (4) in FIG. 44 correspond to (1) to (4) in FIG. 43, respectively.
  • CC1 since CC1 is PCell and Scheduling Cell, it has a downlink radio control channel PDCCH and a downlink shared channel PDSCH.
  • CC2 is a SCell and is a non-scheduling cell, and therefore has only PDSCH.
  • the SCell By setting the SCell as Scheduling Cell, the PDCCH for SCell transmitted by the PCell is removed, and the PDCCH for SCell is added to the SCell. In other words, the SDC PDCCH has been moved from the PCell to the SCell.
  • both CC1 and CC2 have PDCCH and PDSCH.
  • CC1 is changed to SCell and CC2 is changed to PCell.
  • CC1 is set to Non-scheduling Cell and CC2 is set to Scheduling Cell. That is, PDCCH for CC1 (new SCell) transmitted in CC1 (new SCell) is deleted (or released), and PDCCH for CC1 (new SCell) is added to CC2 (new PCell). Accordingly, CC1 (new SCell) has only PDSCH, and CC2 (new PCell) has PDCCH and PDSCH.
  • FIG. 45 is a block diagram of the base station.
  • FIG. 46 is a block diagram of the terminal. 45, the same components as those in FIG. 21 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 46, the same components as those in FIG. 22 are denoted by the same reference numerals, and description thereof will be omitted.
  • the terminal UE determines the necessity of PCell / SCell change, and notifies the base station eNB of the PCell / SCell change request.
  • the base station eNB Upon receiving this, the base station eNB notifies the terminal that the bandwidth control unit 20 is changing at least the SCell that is a Non-scheduling Cell from the Non-scheduling Cell to the Scheduling Cell. Specifically, the downlink radio control channel of the scheduling cell that transmits a control signal to the non-scheduling cell is changed to non-scheduling cell.
  • information related to the change and a change notification are transmitted using the downlink radio control channel of Scheduling Cell (PCell or other SCell).
  • PCell or other SCell may be control signals included in the radio channel reconfiguration message (RRCConnectionReconfiguration) message) as described in the first configuration example.
  • the change timing may also be notified. All SCells may be changed to SchedulingulCell. Specifically, TS36.331 6.3.2 CrossCarrierSchedulingConfig may be notified as schedulingCellId of IE.
  • the terminal UE and the base station eNB that have received this change at least, and change the SCell that is Non-scheduling Cell from Non-scheduling Cell to Scheduling Cell, and the change target, SCell that is Non-scheduling Cell
  • the downlink radio control channel (PDCCH) for the packet is changed from the PCell that is the scheduling Cell to the SCell that becomes the Scheduling Cell. (Delete (release) PDCCH of PCell and add (set) PDCCH to SCell.)
  • a radio channel reconfiguration complete message (RRCConnectionReconfigurationComplete message) may be returned from the terminal UE to the base station eNB.
  • the terminal UE may notify the base station eNB of a failure to reconfigure the radio channel.
  • PCell and SCell are changed (exchanged) as in the first configuration example.
  • the control signal for the change (exchange) request transmitted at the time of change (exchange) is transmitted on the downlink radio control channel PDCCH of only one of PCell or SCell, or on the downlink radio control channel PDCCH of both PCell and SCell. To do.
  • PCell former SCell
  • SCell former SCell
  • PCell former SCell
  • SCell former PCell
  • SCell former PCell
  • other SCells former SCell
  • the SCell (former PCell) that is the target of the change is changed from Scheduling Cell to Non-scheduling Cell.
  • one of the downlink radio control channels PDCCH of PCell (original SCell) or SCell (original PCell), or both downlink radio control channels PDCCH, SCell (original PCell) is transferred from Non-scheduling to Cell Change to.
  • it may be a control signal included in a radio channel reconfiguration complete message (RRCConnectionReconfigurationComplete message) as in the first configuration example.
  • RRCConnectionReconfigurationComplete message radio channel reconfiguration complete message
  • the control signal for change is described as being transmitted using the downlink radio control channel PDCCH, but may be transmitted using the downlink shared data channel PDSCH.
  • FIG. 47 is a sequence diagram showing the flow of processing of the third configuration example.
  • An RS (Pilot) is transmitted from the base station.
  • the terminal measures the radio channel quality. For example, measure RSRP.
  • change determination is performed based on at least the wireless channel quality of PCell and SCell. For example, compare SCell's radio channel quality (or radio channel quality information) with PCell's radio channel quality (or radio channel quality information), and if the former is good, determine that it is necessary to change PCell and SCell. .
  • PCell radio channel quality or radio channel quality information
  • SCell radio channel quality information or radio channel quality information
  • the change determination may be performed in consideration of parameters and the like.
  • a PCell / SCell change request is transmitted from the terminal to the base station.
  • the base station performs PCell and SCell change control.
  • the base station notifies the terminal to change the SCell to the Scheduling Cell, and sets the SCell as the Scheduling Cell.
  • a PCell / SCell change notification is transmitted from the base station to the terminal.
  • the base station notifies the terminal of changing the SCell to a non-scheduling cell.
  • SCell is set to Non-scheduling Cell. That is, the downlink radio control channel PDCCH of the SCell that was transmitted in the SCell (that is, the scheduling cell) is released (deleted), and the downlink radio control channel PDCCH for the SCell is added (set) to the PCell.
  • FIG. 48 is a flowchart showing the flow of processing of the third configuration example.
  • step S160 wireless channel quality is measured, and in step S161, a cell to be PCell is selected.
  • step S162 a PCell / SCell change request is transmitted.
  • step S163 SCell setting change control is performed to make the SCell a Scheduling Cell.
  • step S164 the setting of PCell and SCell is changed by PCell and SCell change control.
  • the SCell is changed to a non-scheduling cell by SCell setting change control.
  • Non-scheduling Cell is set to Scheduling Cell by changing the PDCCH setting. Specifically, this is realized by changing the PDCCH that has been transmitted by the PCell until then to be transmitted by SCell.
  • FIG. 49 to 51 are diagrams for explaining a fourth configuration example of the present embodiment.
  • FIG. 49 is a block configuration diagram of the base station
  • FIG. 50 is a block configuration diagram of the terminal. 49, the same components as those in FIG. 36 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 50, the same components as those in FIG. 37 are denoted by the same reference numerals, and the description thereof will be omitted.
  • the fourth configuration example shows a case where the base station makes a change determination in the third configuration example.
  • the PCell / SCell change determination by the base station of the second configuration example is applied to the third configuration example.
  • the terminal UE receives the pilot signal (RS) transmitted from the base station eNB, and measures the radio channel quality in the radio channel quality measurement and calculation unit 27.
  • RS pilot signal
  • PCell and SCell may be measured, or all CCs transmitted by the base station eNB (that is, CCs other than PCell and SCell) may be measured.
  • the wireless quality measurement result is notified to the wireless channel quality information creation unit 37.
  • the radio channel quality information creating unit 37 sets the measurement result as a discrete numerical value based on a calculation formula or the like, and obtains radio channel quality (Channel Quality) or a radio channel quality index (CQI: Channel Quality Indicator).
  • the obtained radio channel quality is encoded and modulated by the encoding / modulation unit 32, converted into a radio signal by the transmission radio unit 33, and transmitted to the base station eNB via the antenna.
  • the measured radio channel quality may be transmitted only by PCell, or the radio channel quality may be transmitted by the measured CC.
  • the base station eNB that has received the radio channel quality via the antenna 13 converts the radio signal into a baseband signal in the reception radio unit 16, demodulates and decodes the signal in the demodulation / decoding unit 17 as a received signal Reproduce.
  • the radio channel quality information extracting unit 21 extracts at least the PCell and SCell radio channel quality from the reproduced received signal and notifies the bandwidth control unit 20 of the extracted radio channel quality.
  • the bandwidth control unit 20 determines the necessity of changing the PCell and SCell based on the channel quality of the PCell and other SCells based on at least the radio channel quality of the PCell and SCells.
  • the radio channel quality of SCell CC2
  • the radio channel quality of PCell CC1
  • the bandwidth control unit 20 determines that it is necessary to change (exchange) the PCell and the SCell.
  • FIG. 51 is a sequence diagram showing a process flow of the fourth configuration example.
  • a terminal that receives an RS from a base station performs radio channel quality measurement and sends a radio channel quality report to the base station.
  • the base station performs PCell and SCell change determination. For example, if the SCell radio channel quality is better than the PCell radio channel quality, it is determined that the PCell and SCell need to be changed. Subsequently, the base station notifies the terminal to change the SCell to the Scheduling Cell. And SCell is set to Scheduling Cell and the radio
  • Processing to change PCell and SCell is performed while maintaining the wireless line. Then, the base station notifies the terminal that the SCell is changed to a non-scheduling cell. And SCell is set to Non-scheduling Cell. As a result, the SCell radio control channel is deleted (or released), and the radio control channel is set to PCell.
  • transmission delay does not occur or increases as compared with the conventional method. Further, the transmission speed does not decrease. That is, transmission delay can be reduced. Moreover, since the number of component carriers is not reduced, the transmission rate can be improved as compared with the conventional case. ⁇ Do not implement hard handover. ⁇ Do not reduce the number of component carriers to be connected.
  • the time required for changing the PCell and SCell can be shortened compared to the conventional case. That is, when the PCell and SCell are changed, in this embodiment, since the line is not disconnected, there is no need to perform synchronization establishment or random access again, so the time required for the change can be shortened in the present embodiment compared to the conventional case. .

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil de communication sans fil capable de commuter entre une cellule P et une cellule S sans dégrader la vitesse d'émission et sans déconnecter le canal. L'appareil de communication sans fil peut effectuer, par exemple, un paramétrage pour commuter d'une cellule S (CC2) à une nouvelle cellule P (CC2) et commuter ensuite d'une cellule P précédente (CC1) à une nouvelle cellule S (CC1), tout en maintenant la connexion de canal.
PCT/JP2012/057082 2012-03-19 2012-03-19 Appareil de communication sans fil WO2013140533A1 (fr)

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JPWO2015141842A1 (ja) * 2014-03-20 2017-04-13 京セラ株式会社 通信制御方法及びユーザ端末
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US10257778B2 (en) 2014-04-16 2019-04-09 Fujitsu Limited Wireless communication system, base station, and terminal
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JPWO2015159399A1 (ja) * 2014-04-16 2017-04-13 富士通株式会社 無線通信システム、基地局および端末
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JP2018528724A (ja) * 2015-09-29 2018-09-27 ホアウェイ・テクノロジーズ・カンパニー・リミテッド キャリアアグリゲーション技術におけるキャリア選択方法およびデバイス
CN108029103A (zh) * 2015-09-29 2018-05-11 华为技术有限公司 一种载波聚合技术中载波选择方法和设备
KR20180059508A (ko) * 2015-09-29 2018-06-04 후아웨이 테크놀러지 컴퍼니 리미티드 캐리어 어그리게이션 기술에서의 캐리어 선택 방법과 장치
KR102041174B1 (ko) * 2015-09-29 2019-11-06 후아웨이 테크놀러지 컴퍼니 리미티드 캐리어 어그리게이션 기술에서의 캐리어 선택 방법과 장치
JP2019510445A (ja) * 2016-04-01 2019-04-11 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． モビリティ管理方法、装置、及びシステム
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CN109565719A (zh) * 2016-08-03 2019-04-02 瑞典爱立信有限公司 用于主小区改变的方法、设备和计算机程序
JP2019523594A (ja) * 2016-08-03 2019-08-22 テレフオンアクチーボラゲット エルエム エリクソン（パブル） プライマリセル変更のための方法、デバイス及びコンピュータプログラム
JP2021022937A (ja) * 2016-08-03 2021-02-18 テレフオンアクチーボラゲット エルエム エリクソン（パブル） プライマリセル変更のための方法、デバイス及びコンピュータプログラム
US10945176B2 (en) 2016-08-03 2021-03-09 Telefonaktiebolaget Lm Ericsson (Publ) Method, device and computer program for primary cell change
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