WO2014142167A1 - 無線通信システム、基地局装置、端末装置、無線通信方法および集積回路 - Google Patents
無線通信システム、基地局装置、端末装置、無線通信方法および集積回路 Download PDFInfo
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- H—ELECTRICITY
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- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a radio communication system, a base station apparatus, and a terminal apparatus, and more particularly to a radio communication system, a base station apparatus, a terminal apparatus, a radio communication method, and an integrated circuit related to data transmission / reception control.
- This application claims priority on March 13, 2013 based on Japanese Patent Application No. 2013-049799 for which it applied to Japan, and uses the content for it here.
- the W-CDMA system is standardized as a third generation cellular mobile communication system, and services are provided. Also, HSDPA with higher communication speed has been standardized and is being serviced.
- EUTRA Evolved Universal Terrestrial Radio Access
- OFDM Orthogonal Frequency Division Division Multiplexing
- PAPR Peak to Average Power Ratio
- Advanced-EUTRA a further evolution of EUTRA.
- communication at a maximum transmission rate of 1 Gbps or more and uplink 500 Mbps or more is performed using a band up to a maximum of 100 MHz bandwidth in uplink and downlink.
- Advanced-EUTRA it is considered to realize a maximum of 100 MHz band by bundling a plurality of bands compatible with EUTRA so as to accommodate EUTRA mobile station apparatuses.
- one band of 20 MHz or less of EUTRA is called a component carrier (Component Carrier: CC).
- the component carrier is also called a cell.
- bundling a band of 20 MHz or less is called carrier aggregation (Carrier Aggregation: CA) (Non-patent Document 1).
- Non-Patent Document 2 in communication between a base station apparatus and a mobile station apparatus during carrier aggregation of a macro cell and a small cell, control information (control plane information) is transmitted by the macro cell, and user information (user plane information) is transmitted by the small cell.
- control plane information control plane information
- user information user plane information
- Non-Patent Document 2 in communication between the base station device and the mobile station device, control information is transmitted and received between the base station device of the macro cell and the mobile station device, and the base station device of the small cell and the mobile station
- control information and user information must be controlled to be transmitted in an appropriate cell.
- a procedure for switching data transmission / reception control with a mobile station device between a macro cell base station device and a small cell base station device is required.
- One aspect of the present invention has been made in view of such circumstances, and appropriately switches data transmission / reception control between a base station device of a macro cell and a base station device of a small cell and between a base station device and a mobile station device. It is an object of the present invention to provide a mobile station device, a base station device, a wireless communication system, a wireless communication method, and an integrated circuit that can be performed in the same manner.
- a wireless communication system is a wireless communication system in which a first base station device and a second base station device communicate with a terminal device via a plurality of cells.
- the base station device notifies the second base station device of a request message including information on whether to change the data path for the user data of the terminal device, and the second base station device Based on the information on whether or not to change the data path, the data path for the user data of the terminal device is changed.
- the second base station device may not change the data path when the random access preamble transmitted from the terminal device is not received.
- the request message may include an intermittent reception parameter.
- a base station apparatus is a base station apparatus that communicates with a terminal apparatus, and changes a data path for user data of the terminal apparatus to a base station apparatus of an added cell.
- a request message including information on whether or not, a request response message that is a response to the request message is received from the base station device of the cell to be added, and information related to data transmission control of the cell to be added to the terminal device Send a configuration message containing.
- a base station apparatus is a base station apparatus that communicates with a terminal apparatus, and determines whether or not to change a data path from the base station apparatus to user data of the terminal apparatus.
- the request message including the information is received, and the data path for the user data of the terminal device is changed based on the information on whether to change the data path.
- a terminal device is a terminal device that communicates with a first base station device and a second base station device via a plurality of cells, from the first base station device. , Receiving a setting message including information related to data transmission control of the first base station apparatus and the second base station apparatus, and transmitting a random access preamble to the second base station apparatus after receiving the setting message When a random access response message, which is a response to the random access preamble, is received from the second base station apparatus, data transmission control based on information related to the data transmission control is started.
- a radio communication method is a radio communication method of a base station apparatus that communicates with a terminal apparatus, and a data path for user data of the terminal apparatus is added to a base station apparatus of a cell to be added. Transmitting a request message including information on whether or not to change, receiving a request response message that is a response to the request message from the base station apparatus of the cell to be added, and transmitting data to the terminal apparatus Transmitting a setting message including information related to control.
- a radio communication method is a radio communication method of a base station apparatus that communicates with a terminal apparatus, and a data path for user data of the terminal apparatus from another base station apparatus Receiving a request message including information on whether or not to change, and changing a data path for user data of the terminal device based on information on whether or not to change the data path; including.
- a wireless communication method is a wireless communication method of a terminal device that communicates with a first base station device and a second base station device via a plurality of cells, Receiving a setting message including information related to data transmission control of the first base station device and the second base station device from a first base station device; and receiving a random access preamble after receiving the setting message.
- An integrated circuit is an integrated circuit applied to a base station device that communicates with a terminal device, and adds user data of the terminal device to a base station device of a cell to be added.
- An integrated circuit is an integrated circuit applied to a base station device that communicates with a terminal device, and is a data path from another base station device to user data of the terminal device.
- Means for receiving a request message including information on whether or not to change the data, and means for changing the data path for the user data of the terminal device based on information on whether or not to change the data path Have
- An integrated circuit is an integrated circuit applied to a terminal device that communicates with a first base station device and a second base station device via a plurality of cells, Means for receiving a setting message including information related to data transmission control of the first base station device and the second base station device from the first base station device; and a random access preamble after receiving the setting message. Is transmitted to the second base station device, and when a random access response message that is a response to the random access preamble is received from the second base station device, data transmission based on information related to the data transmission control Means for initiating control;
- the OFDM system is adopted as the downlink of EUTRA. Further, a DFT-spread OFDM single carrier communication system is employed as the uplink of EUTRA.
- FIG. 7 is a diagram showing a physical channel configuration of EUTRA.
- the downlink physical channel includes a physical downlink shared channel PDSCH (Physical Downlink Shared Channel), a physical downlink control channel PDCCH (Physical Downlink Control Channel), and a physical broadcast channel PBCH (Physical Broadcast Channel).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PBCH Physical Broadcast Channel
- there are physical signals such as downlink synchronization signals and downlink reference signals (Non-Patent Document 1).
- the uplink physical channel is composed of a physical random access channel PRACH (Physical Random Access Channel), a physical uplink shared channel PUSCH (Physical Uplink Shared Channel), and a physical uplink control channel PUCCH (Physical Uplink Control Channel) ( Non-patent document 1).
- PRACH Physical Random Access Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- FIG. 8 is a diagram illustrating a downlink channel configuration of EUTRA.
- the downlink channels shown in FIG. 8 are each composed of a logical channel, a transport channel, and a physical channel.
- the logical channel defines the type of data transmission service that is transmitted and received in a medium access control (MAC) layer.
- the transport channel defines what characteristics the data transmitted over the air interface has and how it is transmitted.
- a physical channel is a physical channel that carries data conveyed to the physical layer by a transport channel.
- the downlink logical channels include broadcast control channel BCCH (Broadcast Control Channel), paging control channel PCCH (Paging Control Channel), common control channel CCCH (Common Control Channel), dedicated control channel DCCH (Dedicated Control Channel), and dedicated traffic.
- BCCH Broadcast Control Channel
- PCCH Paging Control Channel
- CCCH Common Control Channel
- DCCH dedicated Control Channel
- a channel DTCH Dedicated Traffic Channel
- the downlink transport channels include a broadcast channel BCH (Broadcast Channel), a paging channel PCH (Paging Channel), and a downlink shared channel DL-SCH (Downlink Shared Channel).
- BCH Broadcast Channel
- PCH paging channel
- DL-SCH Downlink Shared Channel
- the downlink physical channels include a physical broadcast channel PBCH (Physical Broadcast Channel), a physical downlink control channel PDCCH (Physical Downlink Control Channel), and a physical downlink shared channel PDSCH (Physical Downlink Shared Channel). These channels are transmitted and received between the base station apparatus and the mobile station apparatus.
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- PDSCH Physical Downlink Shared Channel
- Broadcast control channel BCCH is a downlink channel used to broadcast system control information.
- the paging control channel PCCH is a downlink channel used for transmitting paging information, and is used when the network does not know the cell position of the mobile station apparatus.
- the common control channel CCCH is a channel used for transmitting control information between the mobile station apparatus and the network, and is used by a mobile station apparatus that does not have a radio resource control (RRC) connection with the network. Is done.
- RRC radio resource control
- the dedicated control channel DCCH is a one-to-one (point-to-point) bidirectional channel and is a channel used for transmitting individual control information between the mobile station apparatus and the network.
- the dedicated control channel DCCH is used by a mobile station apparatus having an RRC connection.
- the dedicated traffic channel DTCH is a one-to-one bidirectional channel, is a channel dedicated to one mobile station apparatus, and is used for transferring user information (unicast data).
- the broadcast channel BCH is broadcast to the entire cell in a fixed and predefined transmission format.
- the downlink shared channel DL-SCH supports HARQ (Hybrid Automatic Repeat Request), dynamic adaptive radio link control, discontinuous reception (DRX: Discontinuous Reception), and needs to be broadcast to the entire cell. .
- HARQ Hybrid Automatic Repeat Request
- DRX Discontinuous Reception
- the paging channel PCH supports DRX and needs to be broadcast to the entire cell.
- the paging channel PCH is mapped to a physical resource that is dynamically used for a traffic channel and other control channels, that is, a physical downlink shared channel PDSCH.
- the physical broadcast channel PBCH maps the broadcast channel BCH with a period of 40 milliseconds.
- the physical downlink control channel PDCCH includes downlink shared channel PDSCH resource allocation, hybrid automatic repeat request (HARQ) information for downlink data, and uplink transmission permission (uplink) that is resource allocation of the physical uplink shared channel PUSCH. This is a channel used for notifying the mobile station device of Uplink (grant).
- the physical downlink shared channel PDSCH is a channel used for transmitting downlink data or paging information.
- mapping between the transport channel and the physical channel is performed as follows. Broadcast channel BCH is mapped to physical broadcast channel PBCH. The paging channel PCH and the downlink shared channel DL-SCH are mapped to the physical downlink shared channel PDSCH. The physical downlink control channel PDCCH is used as a physical channel alone.
- mapping between logical channels and transport channels is performed as follows.
- the paging control channel PCCH is mapped to the paging channel PCH.
- Broadcast control channel BCCH is mapped to broadcast channel BCH and downlink shared channel DL-SCH.
- the common control channel CCCH, the dedicated control channel DCCH, and the dedicated traffic channel DTCH are mapped to the downlink shared channel DL-SCH.
- FIG. 9 is a diagram showing an uplink channel configuration of EUTRA.
- the uplink channels shown in FIG. 9 are each composed of a logical channel, a transport channel, and a physical channel. The definition of each channel is the same as the downlink channel.
- the uplink logical channels include a common control channel CCCH (Common Control Channel), a dedicated control channel DCCH (Dedicated Control Channel), and a dedicated traffic channel DTCH (Dedicated Traffic Channel).
- CCCH Common Control Channel
- DCCH dedicated Control Channel
- DTCH dedicated Traffic Channel
- the uplink transport channel includes an uplink shared channel UL-SCH (Uplink Shared Channel) and a random access channel RACH (Random Access Channel).
- UL-SCH Uplink Shared Channel
- RACH Random Access Channel
- the uplink physical channels include a physical uplink control channel PUCCH (Physical Uplink Control Channel), a physical uplink shared channel PUSCH (Physical Uplink Shared Channel), and a physical random access channel PRACH (Physical Random Access Channel). These channels are transmitted and received between the base station apparatus and the mobile station apparatus.
- the physical random access channel PRACH is mainly used for random access preamble transmission for acquiring transmission timing information from the mobile station apparatus to the base station apparatus. Random access preamble transmission is performed in a random access procedure.
- the common control channel CCCH is a channel used for transmitting control information between the mobile station apparatus and the network, and is used by a mobile station apparatus that does not have a radio resource control (RRC) connection with the network. Is done.
- RRC radio resource control
- the dedicated control channel DCCH is a one-to-one (point-to-point) bidirectional channel and is a channel used for transmitting individual control information between the mobile station apparatus and the network.
- the dedicated control channel DCCH is used by a mobile station apparatus having an RRC connection.
- the dedicated traffic channel DTCH is a one-to-one bidirectional channel, is a channel dedicated to one mobile station apparatus, and is used for transferring user information (unicast data).
- the uplink shared channel UL-SCH supports HARQ (Hybrid Automatic Repeat Request), dynamic adaptive radio link control, and discontinuous transmission (DTX). Limited control information is transmitted on the random access channel RACH.
- HARQ Hybrid Automatic Repeat Request
- DTX discontinuous transmission
- the physical uplink control channel PUCCH notifies the base station apparatus of response information (ACK / NACK) for downlink data, downlink radio quality information, and an uplink data transmission request (scheduling request: Scheduling Request: SR). Is the channel used for.
- the physical uplink shared channel PUSCH is a channel used for transmitting uplink data.
- the physical random access channel is a channel used for transmitting a random access preamble.
- the mapping between the transport channel and the physical channel is performed as follows.
- the uplink shared channel UL-SCH is mapped to the physical uplink shared channel PUSCH.
- the random access channel RACH is mapped to the physical random access channel PRACH.
- the physical uplink control channel PUCCH is used as a physical channel alone.
- the logical channel and the transport channel are mapped as follows.
- the common control channel CCCH, the dedicated control channel DCCH, and the dedicated traffic channel DTCH are mapped to the uplink shared channel UL-SCH.
- FIG. 10 shows a protocol stack for handling control data of the mobile station apparatus and base station apparatus of EUTRA.
- FIG. 11 is a protocol stack for handling user data of EUTRA mobile station apparatuses and base station apparatuses. 10 and 11 will be described below.
- the physical layer (Physical layer: PHY layer) provides a transmission service to an upper layer using a physical channel (Physical layer).
- the PHY layer is connected to an upper medium access control layer (Medium Access Control Layer) via a transport channel. Data moves between the MAC layer, the PHY layer, and the layer (layer) via the transport channel. Data transmission / reception is performed between the mobile station apparatus and the base station apparatus via a physical channel.
- Medium Access Control Layer Medium Access Control Layer
- the MAC layer maps various logical channels to various transport channels.
- the MAC layer is connected to an upper radio link control layer (Radio Link Control Layer: RLC layer) through a logical channel.
- RLC layer Radio Link Control Layer
- the logical channel is roughly classified according to the type of information to be transmitted, and is divided into a control channel for transmitting control information and a traffic channel for transmitting user information.
- the MAC layer has a function of controlling the PHY layer to perform intermittent transmission / reception (DRX / DTX), a function of notifying transmission power information, a function of performing HARQ control, and the like.
- the RLC layer divides and concatenates the data received from the upper layer, and adjusts the data size so that the lower layer can transmit data appropriately.
- the RLC layer also has a function for guaranteeing QoS (Quality of Service) required by each data. That is, the RLC layer has functions such as data retransmission control.
- the packet data convergence protocol layer (Packet Data Convergence Protocol layer: PDCP layer) has a header compression function that compresses unnecessary control information in order to efficiently transmit IP packets as user data in a wireless section.
- the PDCP layer also has a data encryption function.
- the radio resource control layer defines only control information.
- the RRC layer sets and resets a radio bearer (RB) and controls a logical channel, a transport channel, and a physical channel.
- the RB is divided into a signal radio bearer (Signaling Radio Bearer: SRB) and a data radio bearer (Data Radio Bearer: DRB), and the SRB is used as a path for transmitting an RRC message as control information.
- DRB is used as a route for transmitting user information.
- Each RB is set between the RRC layers of the base station apparatus and the mobile station apparatus.
- the PHY layer corresponds to the first physical layer in the hierarchical structure of the generally known Open Systems Interconnection (OSI) model, and the MAC layer, RLC layer, and PDCP layer are OSI.
- the RRC layer corresponds to the data link layer, which is the second layer of the model, and the network layer, which is the third layer of the OSI model.
- the random access procedure includes two access procedures: a contention-based random access procedure (Contention based Random Access procedure) and a non-contention based random access procedure (Non-contention based Random Access procedure) (Non-Patent Document 1).
- FIG. 12 is a diagram showing a contention based random access procedure.
- the contention-based random access procedure is a random access procedure that may collide between mobile station devices, and is being connected to the base station device during initial access from a state in which it is not connected (communication) to the base station device. However, this is performed for a scheduling request or the like when uplink data transmission occurs in the mobile station apparatus in a state where uplink synchronization is lost.
- FIG. 13 is a diagram showing a non-contention based random access procedure.
- the non-contention based random access procedure is a random access procedure in which no collision occurs between mobile station devices, and the base station device and the mobile station device are connected but move quickly when the uplink is out of synchronization.
- the mobile station device is instructed by the base station device in a special case such as when handover or the transmission timing of the mobile station device is not effective in order to establish uplink synchronization between the station device and the base station device.
- the non-contention based random access procedure is instructed by an RRC (Radio Resource Control: Layer 3) layer message and physical downlink control channel PDCCH control data.
- RRC Radio Resource Control: Layer 3
- the mobile station device 1-1 transmits a random access preamble to the base station device 3-1 (message 1: (1), step S1).
- the base station device 3-1 that has received the random access preamble transmits a response to the random access preamble (random access response) to the mobile station device 1-1 (message 2: (2), step S2).
- the mobile station device 1-1 transmits an upper layer (Layer2 / Layer3) message based on the scheduling information included in the random access response (message 3: (3), step S3).
- the base station device 3-1 transmits a collision confirmation message to the mobile station device 1-1 that has received the upper layer message of (3) (message 4: (4), step S4).
- contention-based random access is also referred to as random preamble transmission.
- the base station device 3-1 notifies the mobile station device 1-1 of the preamble number (or sequence number) and the random access channel number to be used (message 0: (1) ', step S11).
- the mobile station apparatus 1-1 transmits the random access preamble having the designated preamble number to the designated random access channel RACH (message 1: (2) ', step S12).
- the base station device 3-1 that has received the random access preamble transmits a response to the random access preamble (random access response) to the mobile station device 1-1 (message 2: (3) ', step S13).
- a contention based random access procedure is performed.
- the non-contention based random access procedure is also referred to as dedicated preamble transmission.
- the handover source base station apparatus is shown as a source base station apparatus and the handover destination base station apparatus as a target base station apparatus.
- the mobile station apparatus measures the radio quality of the neighboring frequency and the neighboring cells of the neighboring frequency, and notifies the source base station apparatus of a measurement report message including the radio quality measurement result (step S101).
- the source base station apparatus determines whether or not to perform handover from the measurement result of the mobile station apparatus.
- the source base station apparatus determines a target base station apparatus that is a handover destination, and notifies a handover request message to the target base station apparatus that is a handover destination (step S102).
- the handover request message includes information necessary for handover at the target base station apparatus.
- the information required for the handover includes information on the mobile station device including the C-RNTI at the RRC layer level of the source base station device, information on the mobile station device at an upper layer level higher than the RRC layer, encryption key information, movement There is a MAC address of the station device.
- the handover destination target base station apparatus When the handover destination target base station apparatus accepts the handover, it notifies the handover source source base station apparatus of a handover request response message (step S103).
- the handover request response message includes radio parameters of the cell of the target base station device and information that the target base station device assigns to the mobile station device.
- the information to be allocated includes uplink radio resource information, preamble information for executing a random access procedure at the time of handover, new C-RNTI to the mobile station apparatus, and information on an encryption key.
- the source base station apparatus When the source base station apparatus receives the handover request response message, the source base station apparatus notifies the mobile station apparatus of a handover instruction message (step S104).
- the handover instruction message includes the radio parameters of the cell of the target base station device included in the handover request response message and information assigned to the mobile station device by the target base station device.
- the source base station apparatus After notifying the handover instruction message, the source base station apparatus notifies the target base station apparatus of a status transfer message including user data information of the mobile station apparatus (step S105). Then, the user data of the mobile station apparatus held by the source base station apparatus is transferred to the target base station apparatus.
- the mobile station apparatus receives the handover instruction message, the mobile station apparatus performs downlink synchronization to the target base station apparatus.
- the mobile station apparatus executes a random access procedure in order to synchronize the uplink with the target base station apparatus (step S106). Then, when the mobile station apparatus receives the random access response message from the target base station apparatus and acquires the uplink transmission timing for uplink synchronization, the mobile station apparatus notifies the target base station apparatus of the handover completion message. (Step S107).
- the target base station device When receiving the handover complete message, the target base station device changes the data path from the source base station device to the target base station device because the base station device connected to the MME (Mobility Management Entity) has changed.
- a path switch request message for requesting that is notified (step S108).
- the MME receives the path switch request message, the MME notifies the gateway (Gateway: GW) of the mobility bearer request message (step S109).
- the GW When the GW receives the mobility bearer request message, the GW switches the data path of the user data of the mobile station device from the source base station device to the target base station device. Then, the GW notifies the MME of a mobility bearer request response message (step S110). The MME notifies the target base station device of a path switch request response message (step S111). When the target base station apparatus receives the path switch request response message, the target base station apparatus notifies the source base station apparatus of a mobile station information release message instructing release of information on the mobile station apparatus (step S112). When the source base station device receives the mobile station information release message, the source base station device deletes the information of the mobile station device handed over to the target base station device.
- Advanced-EUTRA a further evolution of EUTRA.
- communication at a maximum transmission rate of 1 Gbps or higher and 500 Mbps or higher of the uplink is performed using a band up to a maximum of 100 MHz bandwidth in the uplink and the downlink, respectively.
- Advanced-EUTRA is considering to realize a maximum of 100 MHz band by bundling a plurality of bands below 20 MHz of EUTRA so that EUTRA mobile station devices can be accommodated.
- one band of 20 MHz or less of EUTRA is called a component carrier (Component Carrier: CC) (Non-patent Document 1).
- one cell is configured by combining one downlink component carrier and one uplink component carrier.
- a single cell can be configured with only one downlink component carrier.
- the base station apparatus allocates a plurality of cells that match the communication capability and communication conditions of the mobile station apparatus, and communicates with the mobile station apparatus via the allocated plurality of cells.
- the some cell allocated to the mobile station apparatus is classified into a 1st cell (Primary Cell: PCell) and a cell other than that as a 2nd cell (Secondary Cell: SCell).
- a special function such as allocation of the physical uplink control channel PUCCH is set in the first cell.
- the mobile station apparatus does not perform downlink reception processing for the second cell immediately after allocation (or the radio resource indicated by the physical downlink control channel PDCCH).
- downlink reception processing is started for the second cell instructed to activate (or in the physical downlink control channel PDCCH) In accordance with the instructed radio resource allocation information).
- the mobile station apparatus performs downlink reception processing for the second cell instructed to deactivate. It stops (or does not follow the radio resource allocation information indicated by the physical downlink control channel PDCCH).
- the second cell that is instructed to activate by the base station device and is performing downlink reception processing is called an activation cell, and the second cell and deactivation immediately after allocation from the base station device to the mobile station device.
- the second cell that has been instructed and has stopped the downlink reception process is called a deactivated cell.
- the first cell is always an activated cell.
- the MAC layer of the mobile station device performs the PHY layer control to manage the PHY layer control and the uplink transmission timing in order to perform cell activation / deactivation when performing carrier aggregation. It also has a function.
- the mobile station apparatus performs dual connection with two base station apparatuses and communicates with both base station apparatuses at the same time.
- Dual connect is not a high-speed backbone line (also referred to as a backhaul) that can be regarded as non-delayed, such as an optical fiber, between a macro cell base station apparatus and a small cell base station apparatus.
- the mobile station device is connected to the macro cell base station device and the small cell base station device, and the mobile station device and both base station devices transmit and receive data via multiple cells. Is assumed.
- carrier aggregation is performed with the macro cell as the first cell (PCell) and the small cell as the second cell (SCell), and communication is performed between the mobile station apparatus and the base station apparatus.
- PCell first cell
- SCell second cell
- control data is transmitted and received between the macro cell base station apparatus and the mobile station apparatus
- user data is transmitted and received between the small cell base station apparatus and the mobile station apparatus.
- base station apparatus that transmits and receives data based on data types (for example, QoS or logical channel) that are finer than control data and user data.
- FIG. 1 is a diagram illustrating a configuration of a mobile station apparatus according to an embodiment of the present invention.
- the mobile station apparatuses 1-1 to 1-3 include a data generation unit 101, a transmission data storage unit 103, a transmission HARQ processing unit 105, a transmission processing unit 107, a radio unit 109, a reception processing unit 111, a reception HARQ processing unit 113, and a MAC.
- the information extraction unit 115, the PHY control unit 117, the MAC control unit 119, the data processing unit 121, and the RRC control unit 123 are configured.
- the data generation unit 101 has functions of a PDCP layer and an RLC layer.
- the data generation unit 101 performs processing such as header compression of the IP packet of user data, data encryption, data division and combination, and adjusts the data size.
- the data generation unit 101 outputs the processed data to the transmission data storage unit 103.
- the transmission data storage unit 103 accumulates the data input from the data generation unit 101, and outputs the instructed data to the transmission HARQ processing unit 105 by the instructed data amount based on the instruction from the MAC control unit 119. . In addition, the transmission data storage unit 103 outputs information on the amount of accumulated data to the MAC control unit 119.
- the transmission HARQ processing unit 105 encodes input data and performs puncture processing on the encoded data. Then, transmission HARQ processing section 105 outputs the punctured data to transmission processing section 107, and stores the encoded data.
- the transmission HARQ processing unit 105 when instructed to retransmit data from the MAC control unit 119, performs a puncture process different from the previously performed puncture from the stored encoded data, and transmits the punctured data to the transmission processing unit 107. Output to.
- the transmission processing unit 107 modulates and encodes the data input from the transmission HARQ processing unit 105.
- the transmission processing unit 107 performs DFT (Discrete Fourier Transform (Discrete Fourier Transform))-IFFT (Inverse Fast Fourier Transform (Inverse Fast Fourier Transform)) processing on the modulated and encoded data, and after processing, CP (Cyclic prefix) Is inserted into the physical uplink shared channel (PUSCH) of each uplink component carrier (cell) and output to the radio section 109.
- DFT Discrete Fourier Transform
- IFFT Inverse Fast Fourier Transform
- CP Cyclic prefix
- the transmission processing unit 107 when there is a response instruction for received data from the PHY control unit 117, the transmission processing unit 107 generates an ACK or NACK signal, places the generated signal in the physical uplink control channel (PUCCH), and transmits the radio unit 109. Output to.
- the transmission processing unit 107 When there is a random access preamble transmission instruction from the PHY control unit 117, the transmission processing unit 107 generates a random access preamble, places the generated signal in a physical random access channel (PRACH), and outputs the generated signal to the radio unit 109.
- PRACH physical random access channel
- the radio unit 109 up-converts the data input from the transmission processing unit 107 to the radio frequency of the transmission position information (transmission cell information) instructed from the PHY control unit 117, adjusts the transmission power, and transmits the data from the transmission antenna. Send.
- Radio section 109 down-converts the radio signal received from the reception antenna and outputs the result to reception processing section 111.
- the reception processing unit 111 performs FFT (Fast Fourier Transform) processing, decoding, demodulation processing, and the like on the signal input from the wireless unit 109.
- the reception processing unit 111 outputs physical downlink shared channel (PDSCH) data among the demodulated data to the reception HARQ processing unit 113.
- the reception processing unit 111 receives response information (ACK / NACK) and uplink transmission permission information (Uplink grant: uplink) of control data acquired from the physical downlink control channel PDCCH among the demodulated data. Grant) to the MAC control unit 119.
- the uplink transmission permission information includes data modulation / coding scheme, data size information, HARQ information, transmission position information, and the like.
- the reception HARQ processing unit 113 performs a decoding process on the input data from the reception processing unit 111, and outputs the data to the MAC information extraction unit 115 when the decoding process is successful.
- the reception HARQ processing unit 113 stores the data that has failed in the decoding process when the decoding process of the input data has failed.
- the reception HARQ processing unit 113 When receiving the retransmission data, the reception HARQ processing unit 113 combines the stored data and the retransmission data and performs a decoding process. Further, the reception HARQ processing unit 113 notifies the MAC control unit 119 of success or failure of the input data decoding process.
- the MAC information extraction unit 115 extracts control data of the MAC layer (Medium Access Access Control layer) from the data input from the reception HARQ processing unit 113, and outputs the extracted control information to the MAC control unit 119.
- the MAC information extraction unit 115 outputs the remaining data to the data processing unit 121.
- the data processing unit 121 has functions of a PDCP layer and an RLC layer, performs a decompression function of a compressed IP header, a decryption function of encrypted data, a data division and combination, and the like, and converts the data into an original form Return to.
- the data processing unit 121 divides the RRC message and user data, outputs the RRC message to the RRC control unit 123, and outputs the user data to the upper layer.
- the PHY control unit 117 controls the transmission processing unit 107, the radio unit 109, and the reception processing unit 111 according to an instruction from the MAC control unit 119.
- the PHY control unit 117 notifies the transmission processing unit 107 of the modulation / coding scheme and transmission position from the modulation / coding scheme, transmission power information and transmission position information (transmission cell information) notified from the MAC control unit 119,
- the radio unit 109 is notified of the frequency information and transmission power information of the transmission cell.
- the MAC control unit 119 determines the data transmission destination based on the data transmission control setting specified from the RRC control unit 123, the data amount information acquired from the transmission data storage unit 103, and the uplink transmission permission information acquired from the reception processing unit 111. The data transmission priority order is determined, and information about data to be transmitted is notified to the transmission data storage unit 103. Also, the MAC control unit 119 notifies the transmission HARQ processing unit 105 of HARQ information, and outputs the modulation / coding scheme and transmission position information (transmission cell information) to the PHY control unit 117.
- the MAC control unit 119 obtains response information for the uplink transmission data from the reception processing unit 111, and when the response information indicates NACK (non-response), retransmits to the transmission HARQ processing unit 105 and the PHY control unit 117. Instruct.
- the MAC control unit 119 instructs the PHY control unit 117 to transmit an ACK or NACK signal.
- the MAC control unit 119 has a MAC layer function, and activation / deactivation instruction information of cells (or component carriers) and discontinuous reception (DRX) control in the MAC control information input from the MAC information extraction unit 115.
- the PHY control unit 117 is controlled to control the radio unit 109, the transmission processing unit 107, and the reception processing unit 111 in order to perform activation / deactivation control and DRX control.
- the MAC control unit 119 outputs transmission timing information among the MAC control information input from the MAC information extraction unit 115 to the PHY control unit 117.
- the MAC control unit 119 manages uplink transmission timing and controls the PHY control unit 117.
- the RRC control unit 123 communicates with the base station device 3-1 and the base station device 3-2, such as connection / disconnection processing with the base station device 3-1, setting of carrier aggregation, control data and data transmission control setting of user data, etc. Make various settings to perform The RRC control unit 123 exchanges information with an upper layer associated with the various settings, and controls a lower layer associated with the various settings.
- the RRC control unit 123 creates an RRC message and outputs the created RRC message to the data generation unit 101.
- the RRC control unit 123 analyzes the RRC message input from the data processing unit 121.
- the RRC control unit 123 creates a message indicating the transmission capability of the mobile station apparatus and outputs the message to the data generation unit 101. Further, the RRC control unit 123 outputs information necessary for the MAC layer to the MAC control unit 119 and outputs information necessary for the physical layer to the PHY control unit 117.
- the transmission processing unit 107, the radio unit 109, the reception processing unit 111, and the PHY control unit 117 perform operations of the physical layer, and transmit data storage unit 103, transmission HARQ processing unit 105, reception HARQ processing unit 113, MAC information extraction.
- 115 and MAC control unit 119 operate in the MAC layer
- data generation unit 101 and data processing unit 121 operate in the RLC layer and PDCP layer
- RRC control unit 123 operates in the RRC layer.
- FIG. 2 is a diagram showing a configuration of the base station apparatus according to the embodiment of the present invention.
- the base station device 3-1 or the base station device 3-2 includes a data generation unit 201, a transmission data storage unit 203, a transmission HARQ processing unit 205, a transmission processing unit 207, a radio unit 209, a reception processing unit 211, and a reception HARQ.
- the data generation unit 201 has functions of a PDCP layer and an RLC layer, and performs processing such as header compression of the IP packet of user data, data encryption, data division and combination, and adjusts the data size.
- the data generation unit 201 outputs the processed data and the logical channel information of the data to the transmission data storage unit 203.
- the transmission data storage unit 203 accumulates the data input from the data generation unit 201 for each user, and transmits the user data instructed based on the instruction from the MAC control unit 219 for the specified data amount. The data is output to the unit 205. Also, the transmission data storage unit 203 outputs information on the amount of accumulated data to the MAC control unit 219.
- the transmission HARQ processing unit 205 encodes input data and performs puncture processing on the encoded data. Then, the transmission HARQ processing unit 205 outputs the punctured data to the transmission processing unit 207, and stores the encoded data. The transmission HARQ processing unit 205, when instructed to retransmit data from the MAC control unit 219, performs a puncture process different from the previously performed puncture from the stored encoded data, and transmits the punctured data to the transmission processing unit 207. Output to.
- the transmission processing unit 207 modulates and encodes the data input from the transmission HARQ processing unit 205.
- the transmission processing unit 207 maps the modulated and encoded data to signals such as physical downlink control channel PDCCH, downlink synchronization signal, physical broadcast channel PBCH, physical downlink shared channel PDSCH and the like of each cell,
- the mapped data is subjected to OFDM signal processing such as serial / parallel conversion, IFFT (Inverse Fourier Transform (Inverse Fast Fourier Transform)) conversion, and CP insertion to generate an OFDM signal.
- OFDM signal processing such as serial / parallel conversion, IFFT (Inverse Fourier Transform (Inverse Fast Fourier Transform)) conversion, and CP insertion to generate an OFDM signal.
- the transmission processing unit 207 outputs the generated OFDM signal to the wireless unit 209.
- the transmission processing unit 207 when there is a response instruction for received data from the MAC control unit 219, the transmission processing unit 207 generates an ACK or NACK signal, places the generated signal on the physical downlink control channel (PDCCH), and transmits the radio unit 209. Output to.
- PDCCH physical downlink control channel
- the radio unit 209 up-converts data input from the transmission processing unit 207 to a radio frequency, adjusts transmission power, and transmits data from the transmission antenna.
- the radio unit 209 down-converts the radio signal received from the reception antenna and outputs it to the reception processing unit 211.
- the reception processing unit 211 performs FFT (Fast Fourier Transform (fast Fourier transform)) processing, decoding, demodulation processing, and the like on the signal input from the wireless unit 209.
- the reception processing unit 211 outputs physical uplink shared channel (PUSCH) data among the demodulated data to the reception HARQ processing unit 213.
- PUSCH physical uplink shared channel
- reception processing unit 211 receives response information (ACK / NACK), downlink radio quality information (CQI), and uplink radio quality information (CQI) of control data acquired from the physical uplink control channel PUCCH among the demodulated data.
- Transmission request information (scheduling request) is output to the MAC control unit 219.
- the reception HARQ processing unit 213 performs a decoding process on the input data from the reception processing unit 211 and outputs the data to the MAC information extraction unit 215 when the decoding process is successful.
- the reception HARQ processing unit 213 stores the data that has failed in the decoding process when the decoding process of the input data has failed.
- the reception HARQ processing unit 213 When receiving the retransmission data, the reception HARQ processing unit 213 combines the stored data and the retransmission data and performs a decoding process. Also, the reception HARQ processing unit 213 notifies the MAC control unit 219 of the success or failure of the input data decoding process.
- the MAC information extraction unit 215 extracts the MAC layer control data from the data input from the reception HARQ processing unit 213, and outputs the extracted control information to the MAC control unit 219.
- the MAC information extraction unit 215 outputs the remaining data to the data processing unit 221.
- the data processing unit 221 has functions of a PDCP layer and an RLC layer, and performs processing such as a decompression function of a compressed IP header, a decryption function of encrypted data, and a division and combination of data. Return to.
- the data processing unit 221 divides the RRC message and user data, outputs the RRC message to the RRC control unit 223, and outputs the user data to the upper layer.
- the MAC control unit 219 has a MAC layer function, and controls the MAC layer based on information acquired from the RRC control unit 223 and lower layers.
- the MAC control unit 219 performs downlink and uplink scheduling processing.
- the MAC control unit 219 includes downlink transmission data response information (ACK / NACK), downlink radio quality information (CQI) and uplink transmission request information (scheduling request) input from the reception processing unit 211, and a MAC information extraction unit. Based on the control information input from 215 and the data amount information for each user acquired from the transmission data storage unit 203, downlink and uplink scheduling processing is performed.
- the MAC control unit 219 outputs the schedule result to the transmission processing unit 207.
- the MAC control unit 219 acquires response information for the uplink transmission data from the reception processing unit 211, and resends to the transmission HARQ processing unit 205 and the transmission processing unit 207 when the response information indicates NACK (non-response). Instruct.
- the MAC control unit 219 instructs the transmission processing unit 207 to transmit an ACK or NACK signal.
- the MAC control unit 219 performs activation / deactivation processing of the cell (or component carrier) assigned to the mobile station apparatus 1-1, management of uplink transmission timing, and the like.
- the RRC control unit 223 performs connection and disconnection processing with the mobile station apparatus 1-1, carrier aggregation settings, mobile station apparatus 1-1 control data and data transmission control settings such as data transmission control settings for user data transmission and reception Various settings for communicating with the station apparatus 1-1 are performed, information is exchanged with an upper layer according to the various settings, and control of a lower layer is performed according to the various settings.
- the RRC control unit 223 creates various RRC messages and outputs the created RRC messages to the data generation unit 201.
- the RRC control unit 223 analyzes the RRC message input from the data processing unit 221.
- the RRC control unit 223 acquires a message indicating the transmission / reception capability of the mobile station device from the mobile station device 1-1
- the RRC control unit 223 performs carrier aggregation suitable for the mobile station device 1-1 based on the transmission / reception capability information of the mobile station device. Set up.
- the RRC control unit 223 outputs information necessary for the MAC layer to the MAC control unit 219 and outputs information necessary for the physical layer to the PHY control unit 217. Further, the RRC control unit 223 notifies the necessary information to the inter-base station communication unit 225 and the MME communication unit 227 when performing handover or dual connection.
- the inter-base station apparatus communication unit 225 connects to another base station apparatus and transmits a control message between the base station apparatuses input from the RRC control unit 223 to the other base station apparatus. Further, the inter-base station apparatus communication unit 225 receives a control message between base station apparatuses from other base station apparatuses, and outputs the received control message to the RRC control unit 223. Control messages between base station apparatuses include a handover request message, a dual connect request message, a handover request response message, a dual connect request response message, a status transfer message, and a mobile station information release message.
- the MME communication unit 227 connects to the MME, and transmits a control message between the base station apparatus and the MME input from the RRC control unit 223 to the MME. Further, the MME communication unit 227 receives a control message between the base station apparatus and the MME from the MME, and outputs the received control message to the RRC control unit 223. Control messages between the base station apparatus and the MME include a path switch request message and a path switch request response message.
- the inter-GW communication unit 229 is connected to the GW, receives user data of the mobile station apparatus sent from the GW, and outputs the received data to the data generation unit 201. Further, the inter-GW communication unit 229 transmits the user data of the mobile station apparatus input from the data processing unit 221 to the GW.
- the transmission processing unit 207, the radio unit 209, and the reception processing unit 211 perform operations of the PHY layer, and transmit data storage unit 203, transmission HARQ processing unit 205, reception HARQ processing unit 213, MAC information extraction unit 215, MAC control.
- the unit 219 performs operations of the MAC layer
- the data generation unit 201 and the data processing unit 221 perform operations of the RLC layer and the PDCP layer
- the RRC control unit 223 performs operations of the RRC layer.
- the macro cell base station apparatus 3-1 and the mobile station apparatus 1-1 detect the small cell base station apparatus 3-2 during communication, and the mobile station apparatus 1-1 detects the base station apparatus 3-1 and the base station apparatus 3 -2 and dual-connect communication between the macro-cell base station device 3-1 and the mobile station device 1-1 and between the small-cell base station device 3-2 and the mobile station device 1-1. It is necessary to make settings.
- the dual connect connection setting procedure is shown below.
- FIG. 3 is a diagram showing an example of a dual connect setting procedure according to the embodiment of the present invention.
- the macro cell base station apparatus is shown as base station apparatus 3-1, and the small cell base station apparatus is shown as base station apparatus 3-2 below.
- the mobile station device 1-1 measures the radio quality of the neighboring cell (peripheral frequency) and notifies the base station device 3-1 of a measurement report message including the radio quality measurement result (step S201).
- the base station apparatus 3-1 determines whether or not to perform dual connection with the base station apparatus 3-2 from the measurement result of the mobile station apparatus 1-1.
- the base station apparatus 3-1 notifies the small cell base station apparatus 3-2 of a dual connect request message (step S202).
- the dual connect request message includes information necessary for dual connection in the small cell base station apparatus 3-2.
- Information necessary for performing the dual connection includes information necessary for the base station apparatus 3-2 to notify the MME of a path switch request message, C-RNTI of the mobile station apparatus 1-1, and encryption key information.
- the base station apparatus 3-2 may include information necessary for performing transmission / reception control of user data of the mobile station apparatus 1-1, and intermittent reception parameters.
- the small cell base station apparatus 3-2 When the small cell base station apparatus 3-2 accepts the dual connect, the small cell base station apparatus 3-2 notifies the macro cell base station apparatus 3-1 of a dual connect request response message (step S203).
- the dual connect request response message includes small cell radio parameters of the base station device 3-2 and information that the base station device 3-2 assigns to the mobile station device 1-1.
- the information that the base station apparatus 3-2 assigns to the mobile station apparatus 1-1 may include radio resource information of the physical uplink control channel PUCCH and radio resource information of the uplink reference signal.
- the handover request message may be substituted for the dual connect request message.
- information indicating dual connection is newly added and included in the handover request message.
- the handover request response message may be substituted for the dual connection request response message, and information indicating dual connection may be newly added to the handover request response message.
- the base station apparatus 3-1 When the base station apparatus 3-1 receives the dual connect request response message, the base station apparatus 3-1 notifies the mobile station apparatus 1-1 of a carrier aggregation setting message (step S204).
- the carrier aggregation setting message includes a small cell radio parameter of the base station device 3-2 included in the dual connect request response message, information assigned to the mobile station device 1-1 by the base station device 3-2, and the mobile station device 1-1.
- the data transmission control information instructing to transmit the user data to the cell of the base station device 3-2 may be included.
- the base station device 3-1 After notifying the carrier aggregation setting message, the base station device 3-1 transmits an activation instruction message for the small cell of the base station device 3-2 to the mobile station device 1-1 (step S205). The base station device 3-1 notifies the base station device 3-2 of the status transfer message including the user data information of the mobile station device 1-1, thereby holding the mobile station held by the base station device 3-1. The user data of the device 1-1 is transferred to the base station device 3-2 (step S206).
- the mobile station apparatus 1-1 When the mobile station apparatus 1-1 receives the activation instruction message, the mobile station apparatus 1-1 performs downlink synchronization processing on the cell of the base station apparatus 3-2.
- the mobile station apparatus 1-1 may perform the downlink synchronization processing after receiving the carrier aggregation setting message.
- the mobile station apparatus 1-1 After the downlink synchronization processing, the mobile station apparatus 1-1 starts monitoring the physical downlink control channel PDCCH from the cell of the base station apparatus 3-2.
- the base station device 3-2 After receiving the status transfer message, the base station device 3-2 transmits a random access instruction message to the mobile station device 1-1 using the physical downlink control channel PDCCH (step S207).
- the mobile station apparatus 1-1 transmits the random access preamble specified by the random access instruction message to the base station apparatus 3-2 (step S208).
- the base station device 3-2 When receiving the random access preamble transmitted from the mobile station device 1-1, the base station device 3-2 transmits a random access response message including transmission timing information to the mobile station device 1-1 (step S209).
- the base station device 3-2 can transmit the user data of the mobile station device 1-1 transferred from the base station device 3-1 to the mobile station device 1-1 after transmitting the random access response message.
- the base station device 3-2 After transmitting the random access response message, the base station device 3-2 changes the data path of the user data of the mobile station device 1-1 to the MME (Mobility Management Entity) from the base station device 3-1 to the base station device 3-2.
- a path switch request message requesting to be sent is notified (step S210).
- the MME When the MME receives the path switch request message, the MME notifies the GW (Gateway) of the mobility bearer request message (step S211).
- the GW receives the mobility bearer request message, the GW changes the data path of the user data of the mobile station device 1-1 from the base station device 3-1 to the base station device 3-2. Then, the GW notifies the MME of a mobility bearer request response message (step S212).
- the MME notifies the base station device 3-2 of a path switch request response message (step S213).
- the base station apparatus 3-2 includes the information indicating that it is in the dual connect state with the base station apparatus 3-1 in the path switch request message, thereby indicating to the MME that the request is a data path change request that is not a handover. You may make it show. Further, a new path switch request message and a path switch request response message may be prepared for dual connection.
- the mobile station apparatus 1-1 In the uplink data transmission control operation of the mobile station apparatus 1-1, when the mobile station apparatus 1-1 receives a random access response message, the mobile station apparatus 1-1 Recognize that user data can be sent. That is, after receiving the random access response message, the mobile station device 1-1 transmits the control data to the base station device 3-1, from the transmission control for transmitting the control data and the user data to the base station device 3-1. The transmission control is changed to transmission of user data to the station apparatus 3-2, and data transmission is started.
- the trigger for switching the data transmission control between the control data and the user data is when the uplink transmission timing for the cell of the base station device 3-2 indicated by the random access response message is applied by the mobile station device 1-1. It is also good.
- the trigger for switching control data and user data transmission control may be when a random access instruction message is received or when an activation instruction message is received.
- the base station apparatus 3-2 transmits a random access instruction message to the mobile station apparatus 1-1, if a random access preamble from the mobile station apparatus 1-1 is not detected or received after a lapse of a predetermined time, The base station device 3-2 notifies the base station device 3-1 that an abnormality has been detected in the mobile station device 1-1. That is, the base station device 3-2 notifies the base station device 3-1 that the random access preamble from the mobile station device 1-1 has not been received.
- the base station device 3-2 stops the procedure for changing the data path of the user data of the mobile station device 1-1. That is, the base station apparatus 3-2 does not transmit a path switch request message for changing the data path of the user data of the mobile station apparatus 1-1 to the MME.
- FIG. 4 is a diagram showing another example of the dual connect setting procedure according to the embodiment of the present invention.
- the macro cell base station apparatus is shown as base station apparatus 3-1, and the small cell base station apparatus is shown as base station apparatus 3-2 below.
- the mobile station apparatus 1-1 measures the radio quality of the neighboring cell (peripheral frequency) and notifies the base station apparatus 3-1 of a measurement report message including the radio quality measurement result (step S301).
- the base station apparatus 3-1 determines whether or not to perform dual connection with the base station apparatus 3-2 from the measurement result of the mobile station apparatus 1-1.
- the base station apparatus 3-1 notifies the small cell base station apparatus 3-2 of a dual connect request message (step S302).
- the dual connect request message includes information necessary for dual connect in the small cell base station apparatus 3-2.
- Information necessary for dual connection includes information necessary for the base station apparatus 3-2 to notify the MME of a path switch request message, C-RNTI of the mobile station apparatus 1-1, encryption key information, base station Information necessary for performing transmission / reception control of user data of the mobile station apparatus 1-1 by the apparatus 3-2 and parameters for intermittent reception may be included.
- the small cell base station apparatus 3-2 When the small cell base station apparatus 3-2 accepts the dual connect, the small cell base station apparatus 3-2 notifies the macro cell base station apparatus 3-1 of a dual connect request response message (step 303).
- the dual connect request response message includes small cell radio parameters of the base station device 3-2 and information assigned to the mobile station device 1-1 by the base station device 3-2.
- the information that the base station apparatus 3-2 assigns to the mobile station apparatus 1-1 may include radio resource information of the physical uplink control channel PUCCH and radio resource information of the uplink reference signal.
- the handover request message may be substituted for the dual connect request message.
- information indicating dual connection is newly added and included in the handover request message.
- the handover request response message may be substituted for the dual connection request response message, and information indicating dual connection may be newly added to the handover request response message.
- the base station device 3-1 When the base station device 3-1 receives the dual connect request response message, the base station device 3-1 notifies the mobile station device 1-1 of a carrier aggregation setting message (step S304).
- the carrier aggregation setting message includes the radio parameter of the cell of the base station device 3-2 included in the dual connect request response message, the information assigned to the mobile station device 1-1 by the base station device 3-2, the mobile station device 1-1 Information instructing to transmit user data to the cell of the base station device 3-2 may be included.
- the base station device 3-1 After notifying the carrier aggregation setting message, the base station device 3-1 transmits an activation instruction message for the cell of the base station device 3-2 to the mobile station device 1-1 (step S305). After transmitting the activation instruction message, the base station apparatus 3-1 completes the activation indicating that the base station apparatus 3-2 has notified the mobile station apparatus 1-1 of the activation instruction for the cell of the base station apparatus 3-2. A message is transmitted (step S306).
- the user data remaining in the base station apparatus 3-1 is not transferred to the base station apparatus 3-2, so that the base station apparatus 3-1 and the base station apparatus 3-2 are not transferred.
- the load on the interface between the base station apparatus 3-1 and the base station apparatus 3-2 is reduced by transmitting as little data as possible.
- the mobile station apparatus 1-1 When the mobile station apparatus 1-1 receives the activation instruction message, the mobile station apparatus 1-1 performs downlink synchronization processing on the cell of the base station apparatus 3-2.
- the mobile station apparatus 1-1 may perform the downlink synchronization processing after receiving the carrier aggregation setting message.
- the mobile station apparatus 1-1 After the downlink synchronization processing, the mobile station apparatus 1-1 starts monitoring the physical downlink control channel PDCCH from the cell of the base station apparatus 3-2.
- the base station device 3-2 After receiving the activation completion message, the base station device 3-2 transmits a random access instruction message to the mobile station device 1-1 using the physical downlink control channel PDCCH (step S307).
- the mobile station apparatus 1-1 transmits the random access preamble specified by the random access instruction message to the base station apparatus 3-2 (step S308).
- the base station apparatus 3-2 When the base station apparatus 3-2 receives the random access preamble transmitted from the mobile station apparatus 1-1, the base station apparatus 3-2 transmits a random access response message including transmission timing information to the mobile station apparatus 1-1 (step S309). After transmitting the random access response message, the base station device 3-2 sends a path switch request message requesting the MME to switch the data path of the mobile station device 1-1 from the base station device 3-1 to the base station device 3-2. Notification is made (step S310).
- the MME When the MME receives the path switch request message, the MME notifies the GW of the mobility bearer request message (step S311).
- the GW When the GW receives the mobility bearer request message, the GW switches the data path of the user data of the mobile station device 1-1 from the base station device 3-1 to the base station device 3-2. Then, the GW notifies the MME of a mobility bearer request response message (step S312).
- the MME notifies the base station device 3-2 of a path switch request response message (step S313).
- the base station device 3-2 includes the information indicating that it is in a dual connect state with the base station device 3-1 in the path switch request message, and notifies the MME that this is a data path switching request that is not a handover. You may make it show. Further, a new path switch request message and a path switch request response message may be prepared for dual connection.
- the mobile station apparatus 1-1 In the uplink data transmission control operation of the mobile station apparatus 1-1, when the mobile station apparatus 1-1 receives a random access response message, the mobile station apparatus 1-1 Recognize that user data can be sent. That is, after receiving the random access response message, the mobile station device 1-1 transmits the control data to the base station device 3-1, from the transmission control for transmitting the control data and the user data to the base station device 3-1. Switching to transmission control for transmitting user data to the station apparatus 3-2 starts data transmission.
- the trigger for switching the data transmission control between the control data and the user data is when the uplink transmission timing for the cell of the base station device 3-2 indicated by the random access response message is applied by the mobile station device 1-1. It is also good.
- the trigger for switching the data transmission control between the control data and the user data may be when a random access instruction message is received or when an activation instruction message is received.
- the base station apparatus 3-2 transmits a random access instruction message to the mobile station apparatus 1-1, if a random access preamble from the mobile station apparatus 1-1 is not detected or received after a lapse of a predetermined time, The base station device 3-2 notifies the base station device 3-1 that an abnormality has been detected in the mobile station device 1-1. That is, the base station device 3-2 notifies the base station device 3-1 that the random access preamble from the mobile station device 1-1 has not been received. Then, the base station device 3-2 stops the procedure for switching the data path of the user data of the mobile station device 1-1. That is, the base station apparatus 3-2 does not transmit a path switch request message for switching the user data path of the mobile station apparatus 1-1 to the MME.
- FIG. 5 is a diagram showing another example of the dual connect setting procedure according to the embodiment of the present invention.
- the macro cell base station apparatus is shown as base station apparatus 3-1, and the small cell base station apparatus is shown as base station apparatus 3-2 below.
- the mobile station apparatus 1-1 measures the radio quality of the neighboring cell (peripheral frequency) and notifies the base station apparatus 3-1 of a measurement report message including the radio quality measurement result (step S401).
- the base station apparatus 3-1 determines whether or not to perform dual connection with the base station apparatus 3-2 from the measurement result of the mobile station apparatus 1-1.
- the base station device 3-1 notifies the small cell base station device 3-2 of a dual connect request message (step S402).
- the dual connect request message includes information necessary for dual connect in the small cell base station apparatus 3-2.
- Information necessary for dual connection includes information necessary for the base station apparatus 3-2 to notify the MME of a path switch request message, C-RNTI of the mobile station apparatus 1-1, encryption key information, base station
- the device 3-2 includes information necessary for performing transmission / reception control of user data of the mobile station device 1-1 and parameters for intermittent reception.
- the small cell base station apparatus 3-2 When the small cell base station apparatus 3-2 accepts the dual connect, the small cell base station apparatus 3-2 notifies the macro cell base station apparatus 3-1 of a dual connect request response message (step S403).
- the dual connect request response message includes radio parameters of the cell of the base station device 3-2 and information assigned to the mobile station device 1-1 by the base station device 3-2.
- the information that the base station device 3-2 assigns to the mobile station device 1-1 includes the radio resource information of the physical uplink control channel PUCCH and the radio resource information of the uplink reference signal.
- the handover request message may be substituted for the dual connect request message.
- information indicating dual connection is newly added and included in the handover request message.
- the handover request response message may be substituted for the dual connection request response message, and information indicating dual connection is newly added to the handover request response message.
- the base station device 3-1 When the base station device 3-1 receives the dual connect request response message, the base station device 3-1 notifies the mobile station device 1-1 of a carrier aggregation setting message (step S404).
- the carrier aggregation setting message includes the radio parameter of the cell of the base station device 3-2 included in the dual connect request response message, the information assigned to the mobile station device 1-1 by the base station device 3-2, the mobile station device 1-1 Information instructing transmission of user data to the cell of the base station apparatus 3-2 is included.
- the base station device 3-1 After notifying the carrier aggregation setting message, the base station device 3-1 switches the data path of the mobile station device 1-1 to the MME from the base station device 3-1 to the base station device 3-2 after transmitting the random access response message.
- a path switch request message for requesting that is notified (step S405).
- the MME When the MME receives the path switch request message, the MME notifies the GW of the mobility bearer request message (step S406).
- the GW When the GW receives the mobility bearer request message, the GW switches the data path of the user data of the mobile station device 1-1 from the base station device 3-1 to the base station device 3-2. Then, the GW notifies the MME of a mobility bearer request response message (step S407).
- the MME notifies the base station device 3-2 of a path switch request response message (step S408).
- the base station device 3-2 includes the information indicating that it is in a dual connect state with the base station device 3-1 in the path switch request message, and notifies the MME that this is a data path switching request that is not a handover. You may make it show. Further, a new path switch request message and a path switch request response message may be prepared for dual connection.
- the base station device 3-1 makes a path switch request to the GW, thereby reducing the amount of data transmitted by the dual connect request message and the status transfer message.
- the load on the interface between the base station apparatus 3-1 and the base station apparatus 3-2 is reduced by transmitting as little data as possible between the base station apparatuses 3-2.
- the base station device 3-1 When receiving the path switch request response message, the base station device 3-1 transmits an activation instruction message for the cell of the base station device 3-2 to the mobile station device 1-1 (step S409). After transmitting the activation instruction message, the base station apparatus 3-1 completes the activation indicating that the base station apparatus 3-2 has notified the mobile station apparatus 1-1 of the activation instruction for the cell of the base station apparatus 3-2. A message is transmitted (step S410).
- the mobile station apparatus 1-1 When the mobile station apparatus 1-1 receives the activation instruction message, the mobile station apparatus 1-1 performs downlink synchronization processing on the cell of the base station apparatus 3-2.
- the mobile station apparatus 1-1 may perform the downlink synchronization processing after receiving the carrier aggregation setting message.
- the mobile station apparatus 1-1 After the downlink synchronization processing, the mobile station apparatus 1-1 starts monitoring the physical downlink control channel PDCCH from the cell of the base station apparatus 3-2.
- the base station device 3-2 After receiving the activation completion message, the base station device 3-2 transmits a random access instruction message to the mobile station device 1-1 using the physical downlink control channel PDCCH (step S411).
- the mobile station apparatus 1-1 transmits the random access preamble specified by the random access instruction message to the base station apparatus 3-2 (step S412).
- the base station apparatus 3-2 When the base station apparatus 3-2 receives the random access preamble transmitted from the mobile station apparatus 1-1, the base station apparatus 3-2 transmits a random access response message including transmission timing information to the mobile station apparatus 1-1 (step S413).
- the mobile station apparatus 1-1 In the uplink data transmission control operation of the mobile station apparatus 1-1, when the mobile station apparatus 1-1 receives a random access response message, the mobile station apparatus 1-1 Recognize that user data can be sent. That is, after receiving the random access response message, the mobile station device 1-1 transmits the control data to the base station device 3-1, from the transmission control for transmitting the control data and the user data to the base station device 3-1. Switch to transmission control for transmitting user data to the station apparatus 3-2.
- the trigger for switching the data transmission control between the control data and the user data is when the uplink transmission timing for the cell of the base station device 3-2 indicated by the random access response message is applied by the mobile station device 1-1. It is also good.
- the trigger for switching the data transmission control between the control data and the user data may be when a random access instruction message is received or when an activation instruction message is received.
- the base station apparatus 3-2 transmits a random access instruction message to the mobile station apparatus 1-1, if a random access preamble from the mobile station apparatus 1-1 is not detected or received after a lapse of a predetermined time, The base station device 3-2 notifies the base station device 3-1 that an abnormality has been detected in the mobile station device 1-1. That is, the base station device 3-2 notifies the base station device 3-1 that it does not receive the random access preamble from the mobile station device 1-1.
- FIG. 6 is a diagram showing another example of the dual connect setting procedure according to the embodiment of the present invention.
- the macro cell base station apparatus is shown as base station apparatus 3-1, and the small cell base station apparatus is shown as base station apparatus 3-2 below.
- the mobile station apparatus 1-1 measures the radio quality of the neighboring cell (peripheral frequency), and notifies the base station apparatus 3-1 of a measurement report message including the radio quality measurement result (step S501).
- the base station apparatus 3-1 determines whether or not to perform dual connection with the base station apparatus 3-2 from the measurement result of the mobile station apparatus 1-1. When performing dual connection with the base station apparatus 3-2, it is determined whether or not to change the data path of user data between the base station apparatus and the GW to the base station apparatus 3-2.
- the base station apparatus 3-1 notifies the dual connect request message to the small cell base station apparatus 3-2 (step S502).
- the dual connect request message includes information necessary for dual connection in the small cell base station apparatus 3-2.
- the information necessary for performing the dual connection is information on whether or not the data path of the user data between the base station apparatus and the GW can be changed, and is necessary for the base station apparatus 3-2 to notify the MME of a path switch request message.
- the small cell base station apparatus 3-2 When the small cell base station apparatus 3-2 accepts the dual connect, the small cell base station apparatus 3-2 notifies the macro cell base station apparatus 3-1 of a dual connect request response message (step S503).
- the dual connect request response message includes small cell radio parameters of the base station device 3-2 and information that the base station device 3-2 assigns to the mobile station device 1-1.
- the information that the base station apparatus 3-2 assigns to the mobile station apparatus 1-1 may include radio resource information of the uplink control channel PUCCH and radio resource information of the uplink reference signal.
- the handover request message may be substituted for the dual connect request message.
- information indicating dual connection is newly added and included in the handover request message.
- the handover request response message may be substituted for the dual connection request response message, and information indicating dual connection may be newly added to the handover request response message.
- the base station apparatus 3-1 When the base station apparatus 3-1 receives the dual connect request response message, the base station apparatus 3-1 notifies the mobile station apparatus 1-1 of a carrier aggregation setting message (step S504).
- the carrier aggregation setting message includes a small cell radio parameter of the base station device 3-2 included in the dual connect request response message, information assigned to the mobile station device 1-1 by the base station device 3-2, and the mobile station device 1-1. May be included to instruct to transmit the user data to the cell of the base station device 3-2.
- the base station apparatus 3-1 After notifying the carrier aggregation setting message, the base station apparatus 3-1 transmits an activation instruction message for the small cell of the base station apparatus 3-2 to the mobile station apparatus 1-1 (step S505).
- the base station device 3-1 notifies the base station device 3-2 of a status transfer message including the user data information of the mobile station device 1-1 (step S506). Then, the user data of the mobile station device 1-1 held by the base station device 3-1 is transferred to the base station device 3-2.
- the base station apparatus 3-1 instructs that the data path is not changed in the data path change enable / disable information of the user data between the base station apparatus and the GW shown in the base station apparatus 3-2, from the GW Continue to transfer received user data. Further, the base station device 3-1 transmits the user data of the mobile station device 1-1 transferred from the base station device 3-2 to the GW.
- the mobile station apparatus 1-1 When the mobile station apparatus 1-1 receives the activation instruction message, the mobile station apparatus 1-1 performs downlink synchronization processing on the cell of the base station apparatus 3-2. After the downlink synchronization processing, the mobile station apparatus 1-1 starts monitoring the physical downlink control channel PDCCH from the cell of the base station apparatus 3-2. After receiving the status transfer message, the base station apparatus 3-2 transmits a random access instruction message to the mobile station apparatus 1-1 using the physical downlink control channel PDCCH (step S507). When receiving the random access instruction message, the mobile station apparatus 1-1 transmits the random access preamble specified by the random access instruction message to the base station apparatus 3-2 (step S508).
- the base station apparatus 3-2 When the base station apparatus 3-2 receives the random access preamble transmitted from the mobile station apparatus 1-1, the base station apparatus 3-2 transmits a random access response message including transmission timing information to the mobile station apparatus 1-1 (step S509).
- the base station device 3-2 can transmit the user data of the mobile station device 1-1 transferred from the base station device 3-1 to the mobile station device 1-1 after transmitting the random access response message. Become.
- the base station apparatus 3-2 moves to the MME after transmitting the random access response message
- a path switch request message requesting to change the data path of the user data of the station apparatus 1-1 from the base station apparatus 3-1 to the base station apparatus 3-2 is notified (step S510). If the data path of the user data is not changed, the base station device 3-2 transmits the data transferred from the base station device 3-1 to the mobile station device 1-1 after receiving the status transfer message. Further, the base station device 3-2 transfers the data transmitted from the mobile station device 1-1 to the base station device 3-1.
- the MME When the MME receives the path switch request message, the MME notifies the GW of the mobility bearer request message (step S511).
- the GW receives the mobility bearer request message, the GW changes the data path of the user data of the mobile station device 1-1 from the base station device 3-1 to the base station device 3-2. Then, the GW notifies the MME of a mobility bearer request response message (step S512).
- the MME notifies the base station device 3-2 of a path switch request response message (step S513).
- the base station apparatus 3-2 includes the information indicating that it is in the dual connect state with the base station apparatus 3-1 in the path switch request message, thereby indicating to the MME that the request is a data path change request that is not a handover. You may make it show. Further, a new path switch request message and a path switch request response message may be prepared for dual connection.
- the mobile station apparatus 1-1 In the uplink data transmission control operation of the mobile station apparatus 1-1, when the mobile station apparatus 1-1 receives a random access response message, the mobile station apparatus 1-1 Recognize that user data can be sent. That is, after receiving the random access response message, the mobile station device 1-1 transmits the control data to the base station device 3-1, from the transmission control for transmitting the control data and the user data to the base station device 3-1. Switch to transmission control for transmitting user data to the station apparatus 3-2.
- the trigger for switching the data transmission control between the control data and the user data is when the uplink transmission timing for the cell of the base station device 3-2 indicated by the random access response message is applied by the mobile station device 1-1. It is also good.
- the trigger for switching the data transmission control between the control data and the user data may be when a random access instruction message is received or when an activation instruction message is received.
- the base station apparatus 3-2 transmits a random access instruction message to the mobile station apparatus 1-1, if a random access preamble from the mobile station apparatus 1-1 is not detected or received after a lapse of a predetermined time, The base station device 3-2 notifies the base station device 3-1 that an abnormality has been detected in the mobile station device 1-1. That is, the base station device 3-2 notifies the base station device 3-1 that it does not receive the random access preamble from the mobile station device 1-1. Then, the base station device 3-2 stops the procedure for changing the data path of the user data of the mobile station device 1-1. That is, the base station apparatus 3-2 does not transmit a path switch request message for changing the data path of the user data of the mobile station apparatus 1-1 to the MME.
- control data is transmitted and received between the macro cell base station apparatus 3-1 and the mobile station apparatus 1-1, and user data is transmitted between the small cell base station apparatus 3-2 and the mobile station apparatus 1-1.
- control data and user data are transmitted and received between the macro cell base station apparatus 3-1 and the mobile station apparatus 1-1, and the small cell base station apparatus 3-2 and the mobile station apparatus 1 are transmitted and received.
- -1 may be configured to transmit and receive user data.
- control data and user data are transmitted and received between the macro cell base station apparatus 3-1 and the mobile station apparatus 1-1, and control data and user data are transmitted between the small cell base station apparatus 3-2 and the mobile station apparatus 1-1. You may comprise so that data may be transmitted / received.
- the macro cell base station apparatus 3-1 transmits data information (for example, QoS or logical channel) transmitted / received by the small cell base station apparatus 3-2 to the small cell base station apparatus 3-2. Notice.
- the macro cell base station apparatus 3-1 moves by including data information (for example, QoS, logical channel, or radio bearer) transmitted and received by the small cell base station apparatus 3-2 in the carrier aggregation setting message. Notify the station device 1-1.
- the macro cell base station apparatus 3-1 transmits the control data transmitted from the small cell base station apparatus 3-2 to the mobile station apparatus 1-1 to the small cell base station apparatus 3-2.
- the user data is transferred to the base station device 3-2.
- the small cell base station apparatus 3-2 transmits a path switch request message for changing the data path designated by the macro cell base station apparatus 3-1, to the MME.
- a mobile station device is described as an example of a terminal device or a communication device, but the present invention is not limited to this, and is a stationary or non-movable electronic device installed indoors and outdoors.
- terminal devices or communication devices such as AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other daily life equipment.
- the mobile station apparatus 1-1, the base station apparatus 3-1 and the base station apparatus 3-2 of the embodiment have been described using functional block diagrams.
- the function of each part of the station apparatus 3-1 and the base station apparatus 3-2 or a program for realizing a part of these functions is recorded on a computer-readable recording medium, and the program recorded on the recording medium is recorded.
- the mobile station apparatus and the base station apparatus may be controlled by being read and executed by a computer system.
- the “computer system” here includes an OS and hardware such as peripheral devices.
- the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.
- the “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case.
- the program may be for realizing a part of the above-described functions, and may be capable of realizing the above-described functions in combination with a program already recorded in the computer system. .
- each functional block used in each of the above embodiments may be realized as an LSI that is typically an integrated circuit.
- Each functional block may be individually formed into chips, or a part or all of them may be integrated into a chip.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- an integrated circuit based on the technology can also be used.
- One embodiment of the present invention can be applied to a wireless communication system, a base station device, a terminal device, a wireless communication method, an integrated circuit, and the like that require efficient switching of data transmission / reception control.
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Abstract
Description
本願は、2013年3月13日に、日本に出願された特願2013-049799号に基づき優先権を主張し、その内容をここに援用する。
[構成説明]
図1は、本発明の実施形態に係る移動局装置の構成を示す図である。移動局装置1-1~1-3は、データ生成部101、送信データ記憶部103、送信HARQ処理部105、送信処理部107、無線部109、受信処理部111、受信HARQ処理部113、MAC情報抽出部115、PHY制御部117、MAC制御部119、データ処理部121、および、RRC制御部123から構成される。
図7~図15で説明したような無線通信システムを想定する。そして、図7が示すように、基地局装置3-1と複数の移動局装置1-1、1-2、1-3とが通信を行なう。また、図15で説明したマクロセルの基地局装置3-1およびスモールセルの基地局装置3-2と移動局装置1-1が複数のセルを介して通信を行なうような無線通信システムを想定している。
尚、マクロセルの基地局装置を基地局装置3-1、スモールセルの基地局装置を基地局装置3-2として以下に示す。
3-1、3-2 基地局装置
101、201 データ生成部
103、203 送信データ記憶部
105、205 送信HARQ処理部
107、207 送信処理部
109、209 無線部
111、211 受信処理部
113、213 受信HARQ処理部
115、215 MAC情報抽出部
117、217 PHY制御部
119、219 MAC制御部
121、221 データ処理部
123、223 RRC制御部
225 基地局装置間通信部
227 MME通信部
229 GW通信部
Claims (12)
- 第一の基地局装置と第二の基地局装置とが複数セルを介して端末装置と通信を行う無線通信システムであって、
前記第一の基地局装置は、前記第二の基地局装置に前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを通知し、
前記第二の基地局装置は、前記データパスの変更を行うか否かの情報に基づいて、前記端末装置のユーザーデータに対するデータパスの変更を行う無線通信システム。 - 請求項1記載の無線通信システムであって、
前記第二の基地局装置は、前記端末装置から送信されるランダムアクセルプリアンブルを受信しない場合、データパスの変更を行なわない無線通信システム。 - 請求項1記載の無線通信システムであって、
前記要求メッセージには間欠受信パラメータが含まれる無線通信システム。 - 端末装置と通信を行う基地局装置であって、
追加するセルの基地局装置に前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを送信し、
前記追加するセルの基地局装置から前記要求メッセージの応答である要求応答メッセージを受信し、
前記端末装置に前記追加するセルのデータ送信制御に関する情報を含んだ設定メッセージを送信する基地局装置。 - 端末装置と通信を行う基地局装置であって、
他の基地局装置から前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを受信し、
前記データパスの変更を行うか否かの情報に基づいて、前記端末装置のユーザーデータに対するデータパスの変更を行う基地局装置。 - 第一の基地局装置および第二の基地局装置と複数セルを介して通信を行う端末装置であって、
前記第一の基地局装置から、前記第一の基地局装置と前記第二の基地局装置のデータ送信制御に関する情報を含んだ設定メッセージを受信し、
前記設定メッセージの受信後にランダムアクセスプリアンブルを前記第二の基地局装置に送信し、
前記第二の基地局装置から前記ランダムアクセスプリアンブルの応答であるランダムアクセスレスポンスメッセージを受信した場合、前記データ送信制御に関する情報に基づいたデータ送信制御を開始する端末装置。 - 端末装置と通信を行う基地局装置の無線通信方法であって、
追加するセルの基地局装置に前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを送信するステップと、
前記追加するセルの基地局装置から前記要求メッセージの応答である要求応答メッセージを受信するステップと、
前記端末装置にデータ送信制御に関する情報を含んだ設定メッセージを送信するステップとを含む無線通信方法。 - 端末装置と通信を行う基地局装置の無線通信方法であって、
他の基地局装置から前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを受信するステップと、
前記データパスの変更を行うか否かの情報に基づいて、前記端末装置のユーザーデータに対するデータパスの変更を行うステップとを含む無線通信方法。 - 第一の基地局装置および第二の基地局装置と複数セルを介して通信を行う端末装置の無線通信方法であって、
前記第一の基地局装置から、前記第一の基地局装置と前記第二の基地局装置のデータ送信制御に関する情報を含んだ設定メッセージを受信するステップと、
前記設定メッセージの受信後にランダムアクセスプリアンブルを前記第二の基地局装置に送信するステップと、
前記第二の基地局装置から前記ランダムアクセスプリアンブルの応答であるランダムアクセスレスポンスメッセージを受信した場合、前記データ送信制御に関する情報に基づいたデータ送信制御を開始するステップとを含む無線通信方法。 - 端末装置と通信を行う基地局装置に適用される集積回路であって、
追加するセルの基地局装置に前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを送信する手段と、
前記追加するセルの基地局装置から前記要求メッセージの応答である要求応答メッセージを受信する手段と、
前記端末装置に前記追加するセルのデータ送信制御に関する情報を含んだ設定メッセージを送信する手段を有する集積回路。 - 端末装置と通信を行う基地局装置に適用される集積回路であって、
他の基地局装置から前記端末装置のユーザーデータに対するデータパスの変更を行うか否かの情報を含んだ要求メッセージを受信する手段と、
前記データパスの変更を行うか否かの情報に基づいて、前記端末装置のユーザーデータに対するデータパスの変更を行う手段を有する集積回路。 - 第一の基地局装置および第二の基地局装置と複数セルを介して通信を行う端末装置に適用される集積回路であって、
前記第一の基地局装置から、前記第一の基地局装置と前記第二の基地局装置のデータ送信制御に関する情報を含んだ設定メッセージを受信する手段と、
前記設定メッセージの受信後にランダムアクセスプリアンブルを前記第二の基地局装置に送信する手段と、
前記第二の基地局装置から前記ランダムアクセスプリアンブルの応答であるランダムアクセスレスポンスメッセージを受信した場合、前記データ送信制御に関する情報に基づいたデータ送信制御を開始する手段を有する集積回路。
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