WO2014157888A1 - 복수의 기지국과 연결된 상황에서의 핸드오버 방법 및 그 장치 - Google Patents
복수의 기지국과 연결된 상황에서의 핸드오버 방법 및 그 장치 Download PDFInfo
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- WO2014157888A1 WO2014157888A1 PCT/KR2014/002449 KR2014002449W WO2014157888A1 WO 2014157888 A1 WO2014157888 A1 WO 2014157888A1 KR 2014002449 W KR2014002449 W KR 2014002449W WO 2014157888 A1 WO2014157888 A1 WO 2014157888A1
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- base station
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- cell
- radio bearer
- handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
Definitions
- the present invention relates to a handover technology and to a handover technology for supporting mobility of a terminal having dual connectivity with a plurality of base stations in a small cell environment.
- LTE Long Term Evolution
- LTE-Advanced of the 3GPP series require high-speed large-capacity communication systems capable of transmitting and receiving various data such as video and wireless data, beyond voice-oriented services.
- the terminal may transmit and receive data by forming a dual connection with the base station providing the macro cell and the base station providing the small cell, and may form at least one bearer with each base station.
- handover technology is an essential technology to support the mobility of the terminal is an important technology to provide a communication service without disconnection in accordance with the movement of the terminal.
- the present invention proposes a method and apparatus for processing a radio bearer configured in a small cell by a terminal having dual connectivity with a plurality of base stations according to handover.
- the present invention also proposes a method and apparatus for reconfiguring and using a radio bearer configured to be dually connected to a small cell even after the UE performs a handover.
- the present invention provides a method for controlling a handover of a terminal by a first base station constituting dual connectivity to a terminal, the method comprising the steps of determining the handover of the terminal and the cell associated with the second base station Transmitting handover preparation information including radio resource configuration information to the target base station; receiving a handover message including radio resource configuration information of a cell associated with the target base station from the target base station; and a higher level included in the handover message. It provides a method comprising the step of transmitting a layer message to the terminal.
- the present invention is to perform a handover between the first base station and the second base station in a dual connection with the terminal, receiving a higher layer message for the handover from the first base station and higher layer message for the handover Configuring a radio bearer of a cell associated with the target base station based on the method and connecting to the target base station through random access and transmitting higher layer signaling to the target base station, the handover completion information including the handover completion information.
- the first base station for controlling the handover of the terminal constituting the dual connection with the second base station is a hand comprising a control unit for determining the handover of the terminal and the radio resource configuration information of the cell associated with the second base station
- the present invention is a terminal performing a handover in a dual connection with the first base station and the second base station is configured to receive a higher layer message from the first base station and the cell associated with the target base station based on the higher layer message
- a terminal apparatus including a control unit constituting a radio bearer and a transmitter for accessing the target base station through random access and transmitting higher layer signaling including handover completion information to the target base station.
- FIG. 1 is a diagram illustrating a structure of uplink layer 2 in a carrier aggregation configuration based on a single base station.
- FIG. 2 is a diagram illustrating an example of a small cell network to which the present invention can be applied.
- FIG. 3 is a diagram illustrating another example of a small cell network to which the present invention can be applied.
- FIG. 4 is a diagram illustrating another example of a small cell network to which the present invention can be applied.
- FIG. 5 is a diagram illustrating a handover procedure according to an embodiment of the present invention by way of example.
- FIG. 6 is a diagram illustrating an information element of a handover preparation information message to which the present invention can be applied.
- FIG. 7 is a diagram illustrating information of an AS-Config field of a handover preparation information message to which the present invention can be applied.
- FIG. 8 is a diagram illustrating configuration information of an AS-Config field according to an embodiment of the present invention.
- FIG. 9 is a diagram illustrating configuration information of an AS-Config field according to another embodiment of the present invention.
- FIG. 10 is a diagram exemplarily illustrating configuration information of an AS-Config field according to another embodiment of the present invention.
- FIG. 11 is a diagram illustrating configuration information of an AS-Config field according to another embodiment of the present invention.
- FIG. 12 is a diagram illustrating configuration information of an RRM-Config field according to another embodiment of the present invention.
- FIG. 13 is a diagram illustrating an operation of a base station according to another embodiment of the present invention.
- FIG. 14 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- 15 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- 16 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- 17 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- FIG. 18 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
- FIG. 19 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
- the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
- the wireless communication system includes a user equipment (UE) and a base station (Base Station, BS or eNB).
- a user terminal is a comprehensive concept of a terminal in wireless communication.
- UE user equipment
- LTE Long Term Evolution
- HSPA High Speed Packet Access
- MS Mobile Station
- UT User Terminal
- SS Global System for Mobile communications
- GSM Global System for Mobile communications
- a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. It may be called other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and the like.
- a base transceiver system an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and the like.
- a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU communication range.
- BSC base station controller
- the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
- the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
- the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
- the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- OFDM-FDMA OFDM-TDMA
- OFDM-CDMA OFDM-CDMA
- One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
- the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
- the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
- TDD time division duplex
- FDD frequency division duplex
- Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
- a data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.
- a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
- a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
- antenna transmission system a cooperative multi-cell communication system.
- the CoMP system may include at least two multiple transmission / reception points and terminals.
- the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- an eNB a base station or a macro cell
- a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
- uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
- a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
- a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
- a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be expressed in the form of transmitting and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
- the eNB performs downlink transmission to the terminals.
- the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
- a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
- PUSCH physical uplink shared channel
- Low power nodes represent nodes that use lower transmit (Tx) power than typical macro nodes.
- a small cell could be constructed using a low power remote radio head (RRH), which is a geographically dispersed antenna within macro cell coverage.
- RRH remote radio head
- the macro cell and the RRH cell should be constructed to be scheduled under the control of one base station.
- an ideal backhaul was required between the macro cell node and the RRH node.
- An ideal backhaul means a backhaul that exhibits very high throughput and very low latency, such as a dedicated point-to-point connection using optical fiber, line of sight (LOS) microwaves.
- backhaul that exhibits relatively low throughput and large delay, such as digital subscriber line (xDSL) and non-LOS microwaves is called non-ideal backhaul.
- a plurality of serving cells may be merged to provide a service to a user equipment. That is, a plurality of serving cells may be configured for a terminal in an RRC (Radio Resource Control) connected state, and when an ideal backhaul is established between a macro cell node and an RRH, the macro cell and the RRH cell are configured together with serving cells to provide a service.
- RRC Radio Resource Control
- the terminal may have only one RRC connection with the network.
- One serving cell provides non-access stratum (NAS) mobility information (e.g., TAI: Tracking Area Identity) in RRC connection establishment / re-establishment / handover In the RRC connection reset / handover, one serving cell provides a security input.
- NAS non-access stratum
- PCell primary cell
- SCells Secondary Cells
- PCells may be configured as a serving cell together with a PCell.
- the multi-carrier attribute of the physical layer according to a CA based on a single base station affects only MAC layer (Medium Access Control) for one Hybrid Automatic Retransmit reQuest (HARQ) entity required for each serving cell.
- HARQ Hybrid Automatic Retransmit reQuest
- Each HARQ entity processes a data stream of a component carrier (CC).
- CC component carrier
- FIG. 1 is a diagram illustrating a structure of uplink layer 2 in a carrier aggregation configuration based on a single base station.
- a Packet Data Convergence Protocol (PDCP) layer operates on a Radio Link Control (RLC) layer.
- RLC Radio Link Control
- Each radio bearer RB eg, DRB and SRB
- Each PDCP entity is associated with one or two RLC entities, depending on the RB characteristics (ie, unidirectional or bidirectional) and RLC mode.
- One PDCP entity may be associated with a control plane or a user plane, depending on the entity being carried.
- the PDCP layer of the base station receives a PDCP SDU (Service Data Unit) from the upper layer, performs the sequence numbering and header compression.
- PDCP SDU Service Data Unit
- header compression can be performed only in case of user plane data.
- the PDCP layer of the base station performs integrity protection and encryption of the packet associated with the PDCP SDU, and adds a PDCP header to the lower layer.
- the PDCP layer of the base station may add a PDCP header to the lower layer.
- the PDCP Protocol Data Unit (PDU) generated as described above is delivered to the PDCP layer of the terminal through an air interface.
- PDU PDCP Protocol Data Unit
- the PDCP header is removed for the received PDCP PDU, and integrity protection and encryption of the packet associated with the PDCP SDU is performed. Packets not associated with the PDCP SDU may not perform integrity protection and encryption.
- the PDCP SDU may be delivered to a higher layer.
- the macro cell and the small cell had to be scheduled under the control of one base station in order to use the small cell using the carrier aggregation technology.
- the present invention provides a macro cell and a small cell through a small cell or a cooperation between the macro cell and the small cell under the control of the macro cell in an environment in which the macro cell and the small cell are constructed through separate base stations in a mobile communication network.
- An object of the present invention is to provide an operation method and apparatus for processing a radio bearer configured in a small cell by a terminal dually connected to a cell.
- the master base station located at the end point of the S1-MME, and establishes the RRC connection with the terminal is described as the first base station.
- the master base station may be a base station providing a macro cell, and may be a base station providing any one small cell in a dual connectivity situation between small cells. Also, as described above, the base station may be a base station providing a PCell related to handover.
- the secondary base station that provides additional radio resources to the terminal is distinguished from the master base station in a dual connectivity environment is described as the second base station.
- Each of the first base station and the second base station may provide at least one cell to the terminal, and the first base station and the second base station may be connected through a dual connectivity base station interface (for example, an X2 interface).
- a cell associated with the first base station may be referred to as a macro cell
- a cell associated with the second base station may be referred to as a small cell for clarity.
- a cell associated with the first base station may also be described as a small cell.
- the macro cell in the present invention may mean each of at least one or more cells, and may be described as a generic term for all cells associated with the first base station.
- the small cell may also mean each of at least one or more cells, and may also be described as a generic term for all cells associated with the second base station.
- the cell may be a cell associated with the first base station.
- the cell of the second base station may be described as another small cell or another small cell.
- a base station communicating with a terminal in a handover procedure and determining a handover is called a source base station, and a base station to which the terminal wants to access through a handover procedure is called a target base station.
- the source base station for determining the handover in the duplex connection state is described as the first base station or the base station.
- FIG. 2 is a diagram illustrating an example of a small cell network to which the present invention can be applied.
- the macro cell 210 and the small cells 221, 222, and 223 have the same carrier frequency F1 and the first base station 200 and the second base stations 202, 204, and 206.
- the liver is connected through a non-ideal backhaul.
- Small cells 221, 222, 223 are built in the overlaid macro cell 210.
- An outdoor small cell environment and a small cell cluster 220 are considered.
- FIG. 3 is a diagram illustrating another example of a small cell network to which the present invention can be applied.
- the macro cell 310 and the small cells 321, 322, and 323 have different carrier frequencies F1 and F2, and the first base station 300 and the second base stations ( 302, 304, 306 are connected through a non-ideal backhaul.
- the small cells 321, 322, 323 are built in the overlaid macro cell 310.
- An outdoor small cell environment or an indoor small cell environment and the small cell cluster 320 are considered.
- the second base station may operate as a stand-alone base station. That is, the terminal may establish one RRC connection with the small cell base station and transmit one or more Signaling Radio Bearers (SRBs) for control plane data transmission.
- SRBs Signaling Radio Bearers
- the UE may have a second base station and one or more DRBs (Data Radio Bearers) for user plane data transmission.
- DRBs Data Radio Bearers
- the UE may transmit user plane data through one or more second base stations under control of the first base station, or through cooperation between the first base station and one or more second base stations.
- the terminal establishes one RRC connection with the first base station and transmits one or more Signaling Radio Bearers (SRBs) for control plane data transmission.
- the UE may establish one or more Data Radio Bearers (DRBs) with the first base station and / or the second base station for user plane data transmission.
- DRBs Data Radio Bearers
- one or more DRBs may be configured to simultaneously use radio resources of the first base station and the second base station.
- one or more DRBs using only the first base station radio resource may be configured.
- one or more DRBs using only the second base station radio resource may be configured.
- FIG. 4 is a diagram illustrating another example of a small cell network to which the present invention can be applied.
- the second base stations 410, 412, and 414 may be constructed at edges of the macro cells 400 and 420.
- the terminal When the terminal is located where the first base station coverage 400 of FIG. 4 and the coverage 410 of the small cell cluster overlap, the terminal connects to the first base station 401 and the RRC connection for transmission of control plane data. May be set, and one or more Signaling Radio Bearers (SRBs) may be set.
- SRBs Signaling Radio Bearers
- the UE may configure one or more Data Radio Bearers (DRBs) in the first base station 401 and / or the small cell base stations 410, 412, and 414 for user plane data transmission.
- DRBs Data Radio Bearers
- the first base station 401 may configure radio resources for the first base station 401 and / or the second base stations 410, 412, and 414 through an RRC connection reconfiguration procedure.
- the radio bearer information may refer to radio bearer configuration information.
- the second base station cell identifier is included in the radio bearer information (drb-ToAddMod) of the radioResourceConfigDedicated information.
- drb-ToAddMod the radio bearer information
- a secondary cell index eg, a second base station SCell index
- Information for identifying, by the terminal, the second base station cell (or second base station) radio bearer includes information on at least one of an index, a delimiter, and indication information for the terminal, for identifying the second base station cell (or second base station) radio bearer. It may include.
- information for identifying the second base station cell (or second base station) radio bearer by the terminal is provided by the terminal. It is described as display information.
- detailed configuration information for example, eps-BearerIdentity, drb-Identity, second base station pdcp-Config, second base station rlc-Config, logicalChannelIdentity, logicalChannelConfig
- second base station cell (or second base station) radio bearer It may include.
- a cell provided by the second base station is described as a second base station SCell or a SCell or a cell associated with the second base station or a second base station cell group.
- the SCell represents a first base station secondary cell used as a serving cell in addition to the first base station PCell.
- a cell provided by the second base station is described as an SCell. If it is necessary to distinguish between the first base station secondary cell and the cell provided by the second base station, it will be described separately.
- 2 base station SCell radio resource configuration (radioResourceConfigDedicatedSCell) information (or a second base station cell radio resource configuration (radioResourceConfigSeNBCell or radioResourceConfigSecondaryCellGroup) information or a second base station radio resource configuration (radioResourceConfigDedicatedSeNB) information
- the second base station SCell radio resource configuration (radio resourceConfigDedicatedSCell) information to the second base station radio bearer information (for example, drb-ToAddMod) or detailed configuration information for configuring the second base station radio bearer (for example, eps-BearerIdentity, drb-Identity, second Base station pdcp-Config, second base station rlc-Config, logicalChannelIdentity, logicalChannelConfig)
- the second base station radio bearer information or the detailed configuration information for the second base station radio bearer configuration includes
- the second base station cell index / delimiter / indication information for distinguishing the second base station cell from the second base station cell addition modification information (SCellToAddMod or SeNBCelltoAddMod or SeNBSCelltoAddMod)
- the radio resource configuration information of the second base station or the cell associated with the second base station may include radio bearer configuration information using only the radio resources of the second base station or the second base station cell.
- the radio resource configuration information of the cell associated with the second base station or the second base station may represent radio bearer configuration information using only the radio resources of the second base station or the second base station cell.
- the radio resource configuration information of the second base station or the cell associated with the second base station may represent information for configuring the radio bearer using only the second base station or the second base station cell radio resource through the target base station or the cell associated with the target base station. .
- the coverage of the cell 420 provided by the target base station 402 in a situation where the terminal forms a dual connection with the first base station 401 and the second base station 410, 412, and 414.
- the terminal performs a handover procedure from the first base station 401 to the target base station 402.
- the terminal of the present invention overlaps the coverage of the cell associated with the target base station or the cell associated with the target base station and the cell associated with the second base station at a position where the coverage of the cell associated with the first base station and the cell associated with the second base station overlaps.
- the handover operation in the case of moving to the predetermined position will be described in detail.
- FIG. 5 is a diagram illustrating a handover procedure according to an embodiment of the present invention by way of example.
- a method for controlling handover of a terminal in a situation in which a first base station forms a dual connection with a terminal determining a handover of the terminal and radio resources of a cell associated with the second base station Transmitting handover preparation information including configuration information to a target base station; receiving a handover message including radio resource configuration information of a cell associated with the target base station from the target base station; and transmitting a handover message to the terminal. It includes.
- the terminal 501 configures a dual connection with the first base station (or base station 502) and the second base station 503 (S500 and S505).
- the first base station 502 receives the measurement report from the terminal 501 The handover of the terminal is determined (S510).
- the first base station 502 Before the first base station 502 sends a handover message to the terminal 501, the first base station (eg, the macro cell base station 502) may prepare one or more target cells. The first base station 502 can select a target cell (eg, target base station 504).
- a target cell eg, target base station 504
- the first base station 502 may send an information message necessary for preparing for handover to the target base station 504 (S520).
- the target base station 504 receives the handover preparation information message from the first base station 502, and generates a handover message including information necessary for the terminal 501 to perform the handover and radio bearer configuration information of the terminal. 1 is transmitted to the terminal through the base station (S530, S540).
- the first base station 502 receives the handover message of the target base station 504 and transmits it transparently to the terminal. That is, the first base station 502 may simply perform the handover message received from the target base station 504 to the terminal 501.
- the above-described handover preparation information message and the handover message may be transmitted and received through an X2 interface which may be connected between the first base station and the target base station.
- the terminal 501 receives a handover message, configures a radio bearer based on the received handover message (S550), and completes a random access procedure with the target base station 504 (S560).
- the terminal 501 transmits handover completion information indicating that the handover is completed and normally connected to the target base station to the target base station 504 (S570).
- the handover completion information may be transmitted by higher layer signaling, and for example, may transmit an RRC Connection Reconfiguration Complete message.
- the terminal 501 may transmit / receive data through the target base station or a cell associated with the target base station or the target base station PCell (S580).
- FIG. 6 is a diagram illustrating an information element of a handover preparation information message to which the present invention can be applied.
- the handover preparation information message transmitted by the first base station described with reference to FIG. 5 to the target base station includes information necessary for the terminal to perform handover from the first base station to the target base station.
- information about a UE's radio access capability (ue-RadioAccessCapabilityInfo), AS configuration (AS-Config) information, rrm-Config information, and AS-Context information may be included. Alternatively, any one or more of the above information may be included.
- the handover preparation information may include terminal capability information through which the terminal can use radio resources of the first base station and the second base station through dual connectivity.
- terminal capability information through which the terminal can use radio resources of the first base station and the second base station through dual connectivity.
- single Tx / Rx or multi Tx / Rx capability information may be included.
- the handover preparation information may include radio resource configuration information of a cell associated with the second base station in which the terminal configures dual connectivity.
- the target base station may generate an effective handover message by obtaining information on the radio bearer of the cell associated with the second base station based on the radio resource configuration information of the cell associated with the second base station.
- the terminal since the target base station could only obtain information about the radio base station of the first base station or the cell associated with the first base station or the first base station PCell, the terminal after the handover is completed, the terminal is a radio bearer of the cell associated with the second base station or There is a problem that data transmission through the radio bearer of the cell associated with the second base station is interrupted.
- Radio resource configuration information of a cell associated with a second base station may be transmitted in an AS-Config information field or an RRM-Config information field of a handover preparation information message.
- radio resource configuration information of a cell associated with the second base station is included in an AS-Config information field or an RRM-Config information field will be described in more detail.
- FIG. 7 is a diagram illustrating information of an AS-Config field of a handover preparation information message to which the present invention can be applied.
- the AS-Config information element (hereinafter referred to as 'IE') included in the handover preparation information message relates to RRC configuration information transmitted by the first base station, and is configured by the target base station during the handover preparation step. It can be used to determine the need for change.
- the AS-Config information element according to the present invention may include radio resource configuration information of a cell associated with the second base station. This information may be used after handover is successfully performed or during RRC connection re-establishment.
- the handover preparation information message may include radio resource configuration information of a cell associated with the second base station, and radio resource configuration information of a cell associated with the second base station is included in a cell associated with the second base station. It may include radio bearer configuration information or detailed configuration information of a radio bearer associated with the second base station.
- the radio resource configuration information of the cell associated with the second base station of the handover preparation information message may include the second base station cell index information, the second base station cell identifier, and the terminal. 2 base station) may include at least one or more information of the index / separator / indication information for identifying the radio bearer.
- the radio bearer configuration information of the cell associated with the second base station or the radio bearer associated with the second base station included in the radio resource configuration information of the cell associated with the second base station of the handover preparation information message may be used to configure the radio bearer of the cell associated with the second base station as a radio bearer through the cell associated with the target base station.
- radio resource configuration information of a cell associated with a second base station is included in an AS-Config information element.
- First embodiment A method for transmitting radio resource configuration information of a cell associated with a second base station by adding a second base station cell radio resource configuration (sourceSCellRadioResourceConfig) information element.
- sourceSCellRadioResourceConfig second base station cell radio resource configuration
- FIG. 8 is a diagram illustrating configuration information of an AS-Config field according to an embodiment of the present invention.
- the sourceSCellConfigList information 810 included in the AS-Config information element (IE) may be configured to store radio resource configuration information (common and dedicated) of the first base station secondary cells as in the 3GPP rel-10 technology based on a single base station. Can be represented. As another method, the sourceSCellConfigList information 810 may represent radio resource configuration information (common and dedicated) of cells (SCells) associated with the second base station.
- the sourceSCellConfigList information 810 may include second base station cell index / delimiter / display information for identifying the second base station cell in the second base station cell addition modification information SCellToAddMod-r12.
- the sourceSCellConfigList information element may have the same format as the rel-10 secondary cell additional information (SCellToAddModList-r10) based on a single base station or may have a new format.
- sourceSCellConfigList may be defined as a new information element (sourceSCellConfigList-r12, (SCellToAddModList-r12)) including additional information for dual connection in addition to rel-10 secondary cell addition information (SCellToAddModList-r10).
- the sourcePCellRadioResourceConfig information 801 may indicate radio resource configuration information for all radio bearers existing in a cell (eg, PCell) associated with the first base station.
- SourceSCellRadioResourceConfig (or sourceSecondaryCellGroupRadioResourceConfig or sourceSeNBRadioResourceConfig or SecondaryCellGroupRadioResourceConfig or SecondaryCellRadioResource) may be indicated below, and used herein as sourceSCellRadioResourceConfig) information 805 is present (or configured in a cell associated with a second base station (e.g., a SCell) or a second base station) ) May indicate radio resource configuration information for all radio bearers.
- the target base station receives the handover preparation information message configured as described with reference to FIG. 8 from the first base station, and configures radio resource configuration information, radio bearer configuration information, or radio bearer of a cell (or second base station) associated with the second base station. Information can be received.
- FIG. 9 is a diagram illustrating configuration information of an AS-Config field according to another embodiment of the present invention.
- sourceSCellConfigList information included in an AS-Config information element may represent radio resource configuration information (common and dedicated) of first base station secondary cells, such as a single base station based rel-10 technology.
- the sourceSCellConfigList information may indicate radio resource configuration information (common and dedicated) of cells associated with the second base station.
- the sourceSCellConfigList information may include second base station cell index / delimiter / display information for distinguishing the first base station secondary cell from the second base station cell in the second base station cell addition modification information SCellToAddMod-r12.
- the sourceSCellConfigList information element may have the same format as the rel-10 secondary cell additional information (SCellToAddModList-r10) based on a single base station or may have a new format.
- sourceSCellConfigList may be defined as a new information element (sourceSCellConfigList-r12, (SCellToAddModList-r12)) including additional information for dual connection in addition to rel-10 secondary cell addition information (SCellToAddModList-r10).
- the sourceRadioResourceConfig information may indicate radio resource configuration information for all radio bearers existing in the cell associated with the first base station.
- the sourceSCellConfig information 900 may include radio resource configuration information for all radio bearers present (or configured) in cells associated with the second base station.
- the radio bearer configuration information (for example, srb-ToAddModList, drb-ToAddModList) included in the sourceRadioResourceConfig information and / or the sourceSCellConfig information 900 or the detailed configuration information of the radio bearer may be a cell (e.g., a specific radio bearer associated with a specific second base station). Or it may include information for indicating that the configuration via a specific second base station). For example, the cell index (eg SCell index) associated with the second base station or the second base station cell identifier (eg PCI) or the terminal is a radio bearer associated with the second base station cell (or second base station). It may include index / delimiter / display information for distinguishing.
- the cell index eg SCell index
- the second base station cell identifier eg PCI
- the terminal is a radio bearer associated with the second base station cell (or second base station). It may include index / delimiter / display information for distinguishing.
- the aforementioned sourceSCellConfigList information may indicate radio resource configuration information (common and dedicated) of cells associated with the first base station secondary cells and / or the second base station.
- the sourceSCellConfigList information may include second base station cell index / delimiter / indication information for distinguishing the second base station cell from the second base station cell addition modification information SCellToAddMod-r12.
- the sourceSCellConfigList information element may have the same format as the rel-10 secondary cell additional information (SCellToAddModList-r10) based on a single base station or may have a new format.
- sourceSCellConfigList may be defined as a new information element (sourceSCellConfigList-r12 (SCellToAddModList-r12)) including additional information for dual connectivity in addition to rel-10 secondary cell addition information (SCellToAddModList-r10).
- the above-described sourceRadioResourceConfig information includes radio resource configuration for all radio bearers existing in cells associated with the first base station and the second base station (ie, regardless of PCell and SCell, or regardless of the first base station and the second base station). It can also indicate information. For example, it may include all radio bearer information included in all source serving cells. That is, in the conventional single base station-based LTE technology, the radio resource configuration information for all radio bearers provided through the second base station may be included in addition to the radio resource configuration information for all radio bearers existing in the source PCell. .
- sourceSCellConfig information 900 which is an information element for including the above-described second base station radio bearer information on the AS-Config information element is not included.
- the above-described sourceSCellConfigList information may include radio resource configuration information (common and dedicated) of a cell associated with the first base station secondary cells and / or the second base station and all radios existing in (or configured) in the cells associated with the second base station. It may include radio resource configuration information for bearers.
- the sourceRadioResourceConfig information may indicate radio resource configuration information for all radio bearers existing in a cell associated with the first base station (or PCell).
- sourceSCellConfig information 900 which is an information element for including the above-described second base station radio bearer information on the AS-Config IE is not included.
- Third embodiment A method for transmitting radio resource configuration information of a cell associated with a second base station by adding a second base station cell radio resource configuration (sourceSCellRadioResourceConfig) information element.
- sourceSCellRadioResourceConfig second base station cell radio resource configuration
- FIG. 10 is a diagram exemplarily illustrating configuration information of an AS-Config field according to another embodiment of the present invention.
- the sourceSCellConfigList information 1010 included in the above-described AS-Config information element (IE) may represent radio resource configuration information (common and dedicated) of the first base station secondary cells, as in the rel-10 technology based on a single base station.
- the sourceSCellConfigList information 1010 may represent radio resource configuration information (common and dedicated) of cells associated with the second base station.
- the sourceSCellConfigList information may include second base station cell index / delimiter / indication information for distinguishing the second base station cell from the second base station cell addition modification information SCellToAddMod-r12.
- the sourceSCellConfigList information element may have the same format as the rel-10 secondary cell additional information (SCellToAddModList-r10) based on a single base station or may have a new format.
- sourceSCellConfigList may be defined as a new information element (sourceSCellConfigList-r12, (SCellToAddModList-r12)) including additional information for dual connection in addition to rel-10 secondary cell addition information (SCellToAddModList-r10).
- the sourcePCellRadioResourceConfig information 1001 may represent radio resource configuration information for all radio bearers existing in a cell (eg, PCell) associated with the first base station or in the first base station.
- a cell eg, PCell
- the sourceSCellRadioResourceConfig information 1005 may represent radio resource configuration information for all radio bearers present (or configured) in the cell associated with the second base station or at the second base station.
- the radio bearer information (for example, srb-ToAddModList, drb-ToAddModList) included in the sourcePCellRadioResourceConfig information 1001 and / or the sourceSCellRadioResourceConfig information 1005 described above or detailed configuration information of the radio bearer may be transmitted to a second base station. It may include information for indicating that the configuration via the associated cell (or the second base station). For example, a cell index (eg SCell index) associated with a second base station or a second base station cell identifier (eg PCI) or an index / delimiter / indicator to distinguish that the terminal is a radio bearer associated with a second base station. May contain information.
- a cell index eg SCell index
- a second base station cell identifier eg PCI
- an index / delimiter / indicator to distinguish that the terminal is a radio bearer associated with a second base station. May contain information.
- Radio resource configuration information of radio bearers that simultaneously use radio resources of the first base station and the second base station may be included in the sourcePCellRadioResourceConfig information 1001 described above.
- radio resource configuration information of radio bearers that simultaneously use radio resources of the first base station and the second base station may be included in the sourceSCellRadioResourceConfig information 1005 described above.
- Fourth Embodiment A method of transmitting radio resource configuration information of a cell associated with a second base station by changing second base station cell configuration (sourceSCellConfig) information.
- FIG. 11 is a diagram illustrating configuration information of an AS-Config field according to another embodiment of the present invention.
- sourceSCellConfigList information included in an AS-Config information element may represent radio resource configuration information (common and dedicated) of first base station secondary cells, such as a 3GPP rel-10 technology based on a single base station. .
- the sourceSCellConfigList information may indicate radio resource configuration information (common and dedicated) of cells associated with the second base station.
- the sourceSCellConfigList information may include second base station cell index / delimiter / display information for distinguishing the first base station secondary cell from the second base station cell in the second base station cell addition modification information SCellToAddMod-r12.
- the sourceSCellConfigList information element may have the same format as the rel-10 secondary cell additional information (SCellToAddModList-r10) based on a single base station or may have a new format.
- sourceSCellConfigList may be defined as a new information element (sourceSCellConfigList-r12 (SCellToAddModList-r12)) including additional information for dual connection in addition to rel-10 secondary cell addition information (SCellToAddModList-r10).
- the sourceRadioResourceConfig information may indicate radio resource configuration information for all radio bearers existing in the cell associated with the first base station.
- the sourceSCellConfig information 1100 may include radio resource configuration information for all radio bearers existing (or configured) in cells associated with the second base station.
- the radio bearer information (for example, srb-ToAddModList, drb-ToAddModList) included in the above-described sourceRadioResourceConfig information and / or sourceSCellConfig information 1100 or the detailed configuration information of the radio bearer may be determined by a cell associated with the second base station. Or a second base station). For example, it includes a cell index (e.g., SCell index) or cell identifier (e.g., PCI) associated with the second base station or index / delimiter / indication information for distinguishing that the terminal is a radio bearer associated with the second base station. can do.
- a cell index e.g., SCell index
- cell identifier e.g., PCI
- the radio resource configuration information of the cell associated with the second base station may include radio bearer configuration information or detailed configuration information of the radio bearer in the cell associated with the second base station.
- the radio resource configuration information of the cell associated with the second base station, the cell information associated with the second base station, the second base station cell identifier, the second base station secondary cell index and the terminal is the second base station (or second base station cell) radio bearer It may include at least one or more information of the index / delimiter / display information for distinguishing.
- Each embodiment relates to which information element the second base station cell radio resource configuration information element is used and is essentially a second base station cell (or second base station) radio bearer information or a second base station cell (or second base station) radio bearer. There is no difference in that it uses an information element that contains detailed configuration information of.
- the two base station cell (or the second base station) radio bearer configuration information may be included in radioResourceConfigDedicated information in the RRC reconfiguration message.
- the second base station cell (or second base station) radio bearer configuration information may be included in the second base station cell radio resource configuration information (radioResourceConfigDedicatedSCell or radioResourceConfigSeNBCell or radioResourceConfigSecondaryCellGroup) in an RRC reconfiguration message. have.
- FIG. 12 is a diagram illustrating configuration information of an RRM-Config field according to another embodiment of the present invention.
- the RRM-Config IE may include information on a cell candidate (CandidateCellInfoList-r10) in the target cell.
- the information on the cell candidate in the above-mentioned target cell may include a physical cell identifier (Physical Cell ID), a carrier frequency, a reference signal received power (RSRP), and a reference signal received quality (RSRQ).
- Physical Cell ID Physical Cell identifier
- RSRP reference signal received power
- RSSQ reference signal received quality
- the information on the cell candidate in the target cell described above may include physical cell identifier (Physical Cell ID), carrier frequency, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Receive Quality), and radio bearer configuration indication information. It may be.
- the above-described radio bearer configuration indication information may include cell information associated with a second base station, a second base station cell identifier, a second base station secondary cell index, and information for indicating that the radio bearer is set in the second base station cell candidate.
- the target base station (for example, the base station to which the terminal is to move) that has received the radio resource configuration information (or radio resource configuration information associated with the second base station) of the cells associated with the second base station by the method according to each of the above-described embodiments Whether to configure or release a cell associated with any second base station to SCells after or during handover, or to maintain or release a cell associated with any second base station during handover, or the first embodiment or first described below Configure the radio bearer of the cell associated with the second base station through the cell (or the second base station) associated with the second base station as in the second embodiment, or configure the radio bearer of the cell associated with the second base station as described below in the third embodiment. It may be determined whether to configure through the cell (or target base station) associated with the target base station.
- the first base station transparently forwards the handover message received from the target base station to the terminal (ie, without changing a value or content). That is, the higher layer message included in the handover message is transmitted to the terminal.
- FIG. 13 is a diagram illustrating an operation of a base station according to another embodiment of the present invention.
- the base station determines the handover of the terminal and transmitting the handover preparation information including radio resource configuration information of the cell associated with the second base station to the target base station and the target from the target base station
- the method may include receiving a handover message including radio resource configuration information of a cell associated with a base station and transmitting a higher layer message included in the handover message to the terminal.
- the base station receives information such as a measurement report of the terminal and determines whether the terminal is handover (S1310).
- the base station transmits handover preparation information to the target base station as a preparation procedure for handover of the terminal (S1320).
- the handover preparation information may include radio resource configuration information of a cell associated with the second base station of the terminal constituting the dual connection, and each embodiment includes the same as described with reference to FIGS. 8 to 12.
- Radio resource configuration information of a cell associated with a second base station may include radio bearer configuration information in a cell associated with the second base station or detailed configuration information of a radio bearer associated with the second base station. .
- the radio resource configuration information of a cell associated with the second base station may include cell index information (for example, SCell index), a second base station cell identifier (for example, PCI), and a terminal associated with the second base station.
- Second base station cell may include at least one or more information of the index / separator / indication information for identifying the radio bearer.
- the radio bearer configuration information of the cell associated with the second base station or the detailed configuration information of the radio bearer associated with the second base station may be used to configure the radio bearer of the cell associated with the second base station as a radio bearer through the cell associated with the target base station.
- the base station receives a handover message including information necessary for handover of the terminal from the target base station and transmits it to the terminal transparently (that is, without changing a value or content) (S1330 and S1340).
- the handover message received from the target base station may include information for configuring the radio bearer of the cell associated with the second base station as a radio bearer over the cell associated with the target base station.
- the higher layer message transmitted to the terminal may include information for configuring the radio bearer of the cell associated with the second base station as a radio bearer through the cell associated with the target base station.
- the above-described handover message to be used by the target base station to perform the handover includes an AS-Configuration to be used in a cell associated with the target base station through an RRC connection reconfiguration message. That is, the handover message includes an RRC connection reconfiguration message in a container and transmits the information.
- the RRC connection reconfiguration message included in the handover message includes radio resource configuration information to be used in a cell associated with the target base station.
- the aforementioned RRC Connection Reconfiguration message used for handover includes mobilityControlInfo information.
- the mobilityControlInfo information may include a physical cell ID, a carrier frequency, an uplink / downlink bandwidth, C-RNTI information, etc. of a cell (eg, target PCell) associated with the target base station.
- a cell eg, target PCell
- the aforementioned RRC Connection Reconfiguration message used for handover may include cell information (eg, sCellToAddModList or sCellToReleaseList) associated with the second base station.
- the second base station cell addition modification information associated with the second base station may include second base station cell index / delimiter / indication information for distinguishing the second base station cell.
- RRC Connection Reconfiguration message used for handover may include radio resource configuration information including all bearer information. That is, it may include information information for configuring all bearers configured in the terminal before handover to the target base station (or target base station cell) as radio bearers of cells associated with the target base station as in the third embodiment described below.
- the radio bearer configuration information (for example, srb-ToAddModList, drb-ToAddModList) of the RRC Connection Reconfiguration message or the detailed configuration information of the radio bearer as in the first embodiment or the second embodiment described below may be determined by a specific radio bearer. It may include information for indicating that the configuration via the cell (or the second base station) associated with. For example, a cell index (eg, SCell index) associated with a second base station or a second base station cell identifier (eg, PCI) or a terminal distinguishes a second base station cell (or second base station) radio bearer. It may include the index / separator / display information for.
- a cell index eg, SCell index
- a second base station cell identifier eg, PCI
- a terminal distinguishes a second base station cell (or second base station) radio bearer. It may include the index / separator / display information for.
- the aforementioned RRC Connection Reconfiguration message may include indication information or timer information for continuously maintaining a specific radio bearer configured through a cell associated with a specific second base station.
- the above-described RRC Connection Reconfiguration message may include indication information or timer information for continuously maintaining a specific radio bearer configured through a cell associated with a specific second base station during handover.
- the above-described RRC Connection Reconfiguration message may include indication information or timer information for quickly changing a cell associated with a second base station configured with a specific radio bearer to an active state during handover.
- FIG. 14 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- a terminal constituting a dual connection with a first base station and a second base station performs handover and receives handover messages from the first base station for handover and handover.
- the higher layer message may include information for configuring a radio bearer of a cell associated with the second base station as a radio bearer through a cell associated with the target base station.
- the terminal configures dual connectivity with the first base station and the second base station. That is, a plurality of connections may be configured with at least one cell associated with the first base station and at least one cell associated with the second base station to transmit and receive data.
- the terminal performs a handover procedure based on the handover decision of the first base station.
- the terminal receives an upper layer message for handover from the first base station (S1410).
- the handover message is generated by the target base station and transmitted to the first base station, and the first base station transparently transmits the upper layer message included in the handover to the terminal.
- the message for the UE to perform handover may be received through higher layer signaling. For example, it may be received through an RRC connection reconfiguration message.
- the higher layer message for the handover may include information for configuring the radio bearer of the cell associated with the second base station as the radio base station through the target base station or the cell associated with the target base station or the target base station PCell before the handover. It also contains mobilityControlInfo information.
- the terminal After receiving the higher layer message (RMC Connection Reconfiguration message including mobilityControlInfo) for handover, the terminal configures a radio bearer based on the higher layer message for handover (S1420).
- the higher layer signaling including the handover completion information may be transmitted to the target base station (S1430).
- the higher layer signaling including the handover complete information may be, for example, an RRC Connection Reconfiguration complete message.
- First embodiment A method in which a terminal delivers traffic through a radio bearer configured in a cell associated with a second base station after handover completion.
- 15 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- a terminal configuring a dual connection with a first base station and a second base station receives a higher layer message for handover and a higher layer message from the first base station in performing a handover.
- the terminal before the step of transmitting higher layer signaling, the terminal suspends a radio bearer of a cell associated with the second base station and after transmitting the higher layer signaling.
- the method may further include resuming a radio bearer of a cell associated with the two base stations.
- the terminal buffers the traffic through the cell associated with the second base station, and in the step of resuming the radio bearer of the cell associated with the second base station. 2 Activate the cell associated with the base station to transmit the buffered traffic.
- the terminal receives a higher layer message for the handover described above from the first base station (S1510).
- the higher layer message for handover includes a cell addition modification information associated with a second base station, a second base station cell index information, a second base station cell identifier, and a terminal for identifying a second base station cell (or second base station) radio bearer. It may include at least one or more information of the index / separator / display information.
- the higher layer message for handover may include at least one or more of the indication information and timer information for the maintenance of the radio bearer configured through the cell associated with the second base station or the activation of the second base station cell.
- the terminal receives a higher layer message for handover and configures a radio bearer (S1520).
- the terminal when the terminal receives the handover message, the terminal performs synchronization on the downlink of the cell (PCell of the target base station) associated with the target base station.
- the terminal resets the MAC.
- the terminal resets the PDCP for all radio bearers (RBs).
- RLC for all radio bearers (RBs).
- the terminal adds a cell associated with the second base station.
- cell addition information eg, sCellToAddModList
- the terminal configures the cell associated with the second base station in a lower layer in a deactivated state.
- the terminal performs a radio resource configuration procedure.
- the received radioResourceConfigDedicated information includes radio bearer information (for example, srb-ToAddModList, drb-ToAddModList), the PDCP object is set and configured according to the received pdcp-Config, and the received rlc- The RLC entity is configured and configured according to the Config, and the DTCH logical channel is set according to the received logicalChannelIdentity and logicalChannelConfig.
- radio bearer information for example, srb-ToAddModList, drb-ToAddModList
- the above-described radio bearer information (for example, srb-ToAddModList, drb-ToAddModList) or detailed configuration information of the radio bearer is for indicating that a specific radio bearer is configured through a cell (or a second base station) associated with the second base station.
- the cell index may include a cell index (eg, SCell index) or a cell identifier (eg, PCI) associated with the second base station or an index for identifying the cell by the terminal.
- the terminal may suspend the specific radio bearer until the handover is completed and the cell associated with the second base station configured with the specific radio bearer is activated (S1530).
- the radio bearer interrupt described above may operate up to a timer included in the aforementioned RRC Connection Reconfiguration message, or may operate until a time configured by a local configuration.
- the operation may be performed until a preconfigured time through an RRC Connection Reconfiguration message, or until a cell associated with the second base station is activated.
- a specific radio bearer through the cell associated with the second base station may be configured through the cell associated with the target base station (or another cell associated with the second base station) to transmit traffic (S1550).
- the terminal accesses the target base station through a random access procedure.
- the terminal completes the handover procedure by successfully transmitting the RRC Connection Reconfiguration Complete message to the cell associated with the target base station (S1540).
- the target base station may activate the deactivation / deactivation MAC CE (control element) to activate a small cell composed of cells associated with the second base station.
- the deactivation / deactivation MAC CE control element
- the terminal resumes the interrupted radio bearer (S1550).
- the target base station may activate the small cell consisting of cells associated with the second base station by sending an activation / deactivation MAC CE (control element) before receiving the RRC Connection Reconfiguration Complete message from the terminal.
- an activation / deactivation MAC CE control element
- step S1550 may be performed first before step S1540.
- Second embodiment A method for maintaining a cell associated with a second base station in an activated state when a terminal receives a message for handover.
- 16 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention.
- a terminal constituting a dual connection with a first base station and a second base station performs handover and receives handover messages from the first base station for handover and handover.
- the terminal according to another embodiment of the present invention may further include the step of controlling to maintain the cell associated with the second base station in the activated state, based on the above-described display information and timer information.
- the terminal receives a handover message from the first base station (S1610).
- the handover message may include: cell addition modification information associated with a second base station, second base station cell index information, a second base station cell identifier, and an index / delimiter for the terminal to distinguish the second base station cell (or second base station) radio bearer; At least one piece of display information may be included.
- the handover message may include at least one or more of indication information and timer information for maintaining the radio bearer configured through the cell associated with the second base station or activating the second base station cell.
- the terminal Upon receiving the higher layer message for handover, the terminal configures a radio bearer (S1620).
- the terminal performs synchronization on the downlink of the cell associated with the target base station.
- the terminal resets the MAC.
- the terminal resets the PDCP for all radio bearers (RBs).
- RLC for all radio bearers (RBs).
- the terminal may be configured with a cell associated with the second base station activated in a lower layer.
- the UE configures a cell associated with a second base station in a lower layer in a deactivated state, and then sets radio resource configuration information to a lower layer when configuring a radio bearer configured through a cell associated with a second base station.
- the cell associated with the two base stations may be configured to be in an activated state.
- the terminal may configure a cell associated with the second base station in a lower layer by adding a cell associated with the second base station and setting up a radio bearer configured through a cell associated with the second base station.
- the radio bearer information (eg, srb-ToAddModList, drb-ToAddModList) of the higher layer message (eg, RRC Connection Reconfiguration message) used for handover or the detailed configuration information of the radio bearer may be determined. It may include information for indicating that it is configured through a cell (or a specific second base station) associated with the second base station. For example, a cell index (eg, SCell index) associated with a second base station or a second base station cell identifier (eg PCI) or a terminal distinguishes a second base station cell (or second base station) radio bearer. It may include an index for.
- a cell index eg, SCell index
- a second base station or a second base station cell identifier eg PCI
- a terminal distinguishes a second base station cell (or second base station) radio bearer. It may include an index for.
- a higher layer message used for handover may be an indication or timer for maintaining a specific radio bearer configured through the cell associated with the second base station at the first base station. It may include.
- the above-described upper layer message may display indication information or a timer to keep the specific radio bearer configured through the cell associated with the second base station from the first base station during the handover. It may include.
- a higher layer message may generate an indication or timer to activate a cell associated with a second base station configured with a specific radio bearer at the first base station during the handover. It may include.
- the terminal performs a radio resource configuration procedure.
- the PDCP object is set and configured according to the received pdcp-Config, and the received rlc- Set up and configure the RLC object according to Config.
- the DTCH logical channel is set according to the received logicalChannelIdentity and logicalChannelConfig.
- the above-described radio bearer information (eg, srb-ToAddModList, drb-ToAddModList) or detailed configuration information of the radio bearer indicates that a specific radio bearer is configured through a cell (or a specific second base station) associated with a specific second base station. May contain information for betting.
- a cell index eg, SCell index
- a second base station cell identifier eg PCI
- a terminal distinguishes a second base station cell (or second base station) radio bearer. It may include index / delimiter / indication information.
- the terminal may be to maintain the radio resource configuration for the cell associated with the second base station or the cell associated with the second base station Aekti bait and can be configured to keep the wireless resources.
- the terminal may maintain or activate a specific radio bearer of a cell associated with the second base station (S1630).
- the terminal accesses the target base station through a random access procedure.
- the terminal informs the handover completion information by transmitting higher layer signaling to the target base station (S1640).
- Higher layer signaling may be, for example, an RRC Connection Reconfiguration Complete message.
- the terminal completes the handover procedure by successfully transmitting higher layer signaling.
- Third embodiment A method of completing handover by setting up a radio bearer through a cell associated with a target base station and then setting up a radio bearer in a cell associated with a second base station.
- a terminal constituting a dual connection with a first base station and a second base station performs a target for receiving a handover message from the first base station and a target based on the handover message.
- the terminal receives an upper layer message for handover from the first base station (S1710).
- the terminal configures a radio bearer of a cell associated with the target base station based on the higher layer message for handover (S1720).
- the terminal performs synchronization on the downlink of the target base station.
- the terminal resets the MAC.
- the terminal resets the PDCP for all radio bearers (RBs).
- RLC for all radio bearers (RBs).
- the terminal adds a cell associated with the second base station.
- cell addition information eg, sCellToAddModList
- the terminal configures the cell associated with the second base station in a lower layer in a deactivated state.
- the terminal performs a radio resource configuration procedure.
- the PDCP object is set and configured according to the received pdcp-Config, and the received rlc is received. It configures and configures RLC object according to -Config, and sets DTCH logical channel according to received logicalChannelIdentity and logicalChannelConfig.
- radio bearer information for example, srb-ToAddModList, drb-ToAddModList
- the radio resource configuration information included in the above handover message includes radio bearer information (for example, srb-ToAddModList, drb-ToAddModList) that a specific bearer is configured through a cell (or a second base station) associated with the second base station. Information for presentation is not included.
- radio bearer information for example, srb-ToAddModList, drb-ToAddModList
- Information for presentation is not included.
- a cell index (eg, SCell index) associated with a second base station or a second base station cell identifier (eg PCI) or a terminal distinguishes a second base station cell (or second base station) radio bearer.
- Index / delimiter / display information is not included.
- the signaling radio bearer configuration information includes radio bearer configuration information (srb-Identity, rlc-Config, logicalChannelConfig) information configured through the target base station, and the data radio bearer configuration information includes eps-BearerIdentity, drb configured through the target base station. -Identity, rlc-Config, logicalChannelIdentity, logicalChannelConfig) information is included.
- the radio bearer of the cell associated with the second base station is configured to include a target base station, a cell associated with the target base station, or a radio bearer through the target base station PCell.
- the radio bearer is established through the cell associated with the target base station (S1720).
- the terminal accesses the target base station through a random access procedure.
- the terminal completes the handover procedure by successfully transmitting higher layer signaling (eg, an RRC Connection Reconfiguration Complete message) to the target base station (S1730).
- higher layer signaling eg, an RRC Connection Reconfiguration Complete message
- the target base station may configure a radio bearer through a cell associated with the second base station through a new RRC Connection Reconfiguration message.
- a procedure for adding / modifying a second base station or a second base station cell may be disclosed, or information received through the first base station may be used.
- the above-described upper layer message for the handover is performed by the radio resource configuration (radioResourceConfigDedicated) through the radio bearer information (for example, srb-ToAddModList, drb-ToAddModList) described above. It may include information for indicating that the configuration via the cell (or the second base station). For example, a cell index (eg, SCell index) associated with a second base station or a second base station cell identifier (eg, PCI) or a terminal distinguishes a second base station cell (or second base station) radio bearer. It may include index / delimiter / indication information.
- the radio resource configuration (radioResourceConfigDedicated) included in the higher layer message for the handover described above may be determined through specific radio bearer information (for example, srb-ToAddModList, drb-ToAddModList) or detailed configuration information of the radio bearer.
- Information to indicate that is configured through a cell (or a particular second base station) associated with a particular second base station eg, a cell index (eg, SCell index) associated with a second base station or a second base station cell identifier (eg, PCI) or index / delimiter / marking information for distinguishing a radio base station from a second base station cell (second base station) and the above-described radio bearer configuration information (eg, srb-ToAddModList, drb-ToAddModList).
- a cell index eg, SCell index
- second base station cell identifier e.g, a cell index (eg, SCell index) associated with a second base station or a second base station cell identifier (eg, PCI) or index / delimiter / marking information for distinguishing a radio base station from a second base station cell (second base station) and the above-described radio bearer configuration information (eg, srb-ToAddModList, d
- the terminal configures radio resources for all radio bearers in a cell associated with the target base station through radio resource configuration information contained in the above layer message for handover (S1720).
- the radio bearer of the cell associated with the first base station and / or the cell associated with the second base station is configured as the radio bearer through the target base station or the cell associated with the target base station or the target base station PCell before the handover.
- the terminal accesses the target base station through a random access procedure.
- the terminal completes the handover procedure by successfully transmitting higher layer signaling (eg, an RRC Connection Reconfiguration Complete message) to the target base station (S1730).
- higher layer signaling eg, an RRC Connection Reconfiguration Complete message
- the terminal may configure a radio bearer through a cell associated with the second base station as described above.
- FIG. 18 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
- a user terminal 1800 includes a receiver 1810, a controller 1820, and a transmitter 1830.
- a terminal performing a handover in a dual connection with a first base station and a second base station includes a receiver 1810 that receives a handover message from a first base station and a higher layer for handover.
- the higher layer message for handover may include information for configuring the radio bearer of the cell associated with the second base station as the radio bearer of the cell associated with the target base station.
- the receiver 1810 receives downlink control information, data, and messages from a first base station, a second base station, and a target base station through a corresponding channel.
- the transmitter 1830 transmits uplink control information, data, and messages to a first base station, a second base station, and a target base station through a corresponding channel.
- the terminal 1800 includes all the components for performing the above-described operation of the terminal.
- a base station 1900 includes a controller 1910, a transmitter 1920, and a receiver 1930.
- a first base station for controlling handover of a terminal forming a dual connection with a second base station includes a control unit 1820 for determining a handover of the terminal and radio of a cell associated with the second base station. Included in the transmitter 1830 for transmitting handover preparation information including resource configuration information to the target base station, the receiver 1810 for receiving a handover message including radio resource configuration information of the target base station from the target base station, and the handover message. And a transmitter 1830 for transmitting the higher layer message to the terminal.
- radio resource configuration information of a cell associated with a second base station may include radio bearer configuration information or detailed configuration information of a radio bearer in a cell associated with the second base station.
- the radio resource configuration information of the cell associated with the second base station may include at least one or more information of the index / separator / indication information for identifying the radio bearer.
- the radio bearer configuration information of the cell associated with the second base station or the detailed configuration information of the radio bearer associated with the second base station may be used to configure the radio bearer of the cell associated with the second base station as a radio bearer through the cell associated with the target base station. Can be.
- the higher layer message for handover may include information for configuring the radio bearer of the cell associated with the second base station as the radio bearer of the cell associated with the target base station.
- the controller 1910 controls the overall operation of the base station (first base station) required to control the handover performance of the dually connected terminals required to perform the present invention according to each of the above-described embodiments.
- the transmitter 1920 may transmit handover preparation information to the target base station, and transmits a handover message to the terminal.
- the receiver 1930 is used to transmit and receive a signal, a message, and data necessary for carrying out the present invention.
- Each information field described above has been described as an example, and the name and display of each information field may be expressed differently. Therefore, the information transmitted and received between the terminal, the first base station, the second base station, and the target base station may be transmitted in a variety of information fields.
- the macro cell and the small cell are controlled by the macro cell or the small cell under the control of the macro cell in an environment in which the macro cell and the small cell are constructed through separate base stations through non-ideal backhaul in the mobile communication network.
- the terminal connected to the cell and the small cell at the same time has an effect of using the radio bearer configured in the small cell in accordance with the handover.
- the present invention has the effect of providing a method and apparatus that can be provided through the target base station through a radio bearer configured in the small cell even after the terminal performs the handover.
Abstract
Description
Claims (19)
- 제 1 기지국이 이중 연결을 구성하는 단말의 핸드오버를 제어하는 방법에 있어서,상기 단말의 핸드오버를 결정하는 단계;제 2 기지국에 연관된 셀의 무선자원구성정보를 포함하는 핸드오버 준비 정보를 타켓 기지국으로 전송하는 단계;상기 타켓 기지국으로부터 타켓 기지국에 연관된 셀의 무선자원구성정보를 포함하는 핸드오버 메시지를 수신하는 단계; 및상기 핸드오버 메시지에 포함된 상위계층 메시지를 상기 단말로 전송하는 단계를 포함하는 방법.
- 제 1항에 있어서,상기 제 2 기지국에 연관된 셀의 무선자원구성정보는,AS 구성(AS-Config) 정보에 포함되는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 제 2 기지국에 연관된 셀의 무선자원구성정보는,상기 제 2 기지국에 연관된 셀의 무선 베어러 구성정보 또는 상기 제 2 기지국에 연관된 무선 베어러의 세부 구성정보를 포함하는 것을 특징으로 하는 방법.
- 제 3항에 있어서,상기 제 2 기지국에 연관된 셀의 무선 베어러 구성정보 또는 상기 제 2 기지국에 연관된 무선 베어러의 세부 구성정보는,제 2 기지국 셀 인덱스 정보, 제 2 기지국 셀 식별자 및 상기 단말이 제 2 기지국 셀 무선 베어러 또는 제 2 기지국 무선 베어러를 구별하기 위한 정보 중 적어도 하나 이상의 정보를 포함하는 것을 특징으로 하는 방법.
- 제 3항에 있어서,상기 제 2 기지국에 연관된 셀의 무선 베어러 구성정보 또는 상기 제 2 기지국에 연관된 무선 베어러의 세부 구성정보는,상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀을 통한 무선 베어러로 구성하기 위한 정보인 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 핸드오버 메시지는상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀의 무선 베어러로 구성하기 위한 정보를 포함하는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 단말로 전송되는 상위계층 메시지는상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀의 무선 베어러로 구성하기 위한 정보를 포함하는 것을 특징으로 하는 방법.
- 제 1 기지국 및 제 2 기지국과 이중 연결을 구성하는 단말이 핸드오버를 수행하는 방법에 있어서,상기 제 1 기지국으로부터 핸드오버를 위한 상위계층 메시지를 수신하는 단계;상기 상위계층 메시지에 기초하여 타켓 기지국에 연관된 셀의 무선 베어러를 구성하는 단계; 및랜덤 액세스를 통해서 상기 타켓 기지국에 접속하고 핸드오버 완료 정보를 포함하는 상위계층 시그널링을 상기 타켓 기지국으로 전송하는 단계를 포함하는 방법.
- 제 8항에 있어서,상기 상위계층 메시지는,제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀을 통한 무선 베어러로 구성하기 위한 정보를 포함하는 것을 특징으로 하는 방법.
- 제 8항에 있어서,상기 상위계층 시그널링을 상기 타켓 기지국으로 전송하는 단계 이후에 상기 제 2 기지국에 연관된 셀의 무선 베어러를 구성하기 위한 상위계층 시그널링을 수신하는 단계; 및수신된 상기 상위계층 시그널링에 기초하여 상기 제 2 기지국에 연관된 셀의 무선 베어러를 구성하는 단계를 더 포함하는 방법.
- 이중 연결을 구성하는 단말의 핸드오버를 제어하는 제 1 기지국에 있어서,상기 단말의 핸드오버를 결정하는 제어부;제 2 기지국에 연관된 셀의 무선자원구성정보를 포함하는 핸드오버 준비 정보를 타켓 기지국으로 전송하는 송신부;상기 타켓 기지국으로부터 상기 타켓 기지국에 연관된 셀의 무선자원구성정보를 포함하는 핸드오버 메시지를 수신하는 수신부; 및상기 핸드오버 메시지에 포함된 상위계층 메시지를 상기 단말로 전송하는 송신부를 포함하는 기지국.
- 제 11항에 있어서,상기 제 2 기지국에 연관된 셀의 무선자원구성정보는,AS 구성(AS-Config) 정보에 포함되는 것을 특징으로 하는 기지국.
- 제 11항에 있어서,상기 제 2 기지국에 연관된 셀의 무선자원구성정보는,상기 제 2 기지국에 연관된 셀의 무선 베어러 구성정보 또는 상기 제 2 기지국에 연관된 무선 베어러의 세부 구성정보를 포함하는 것을 특징으로 하는 기지국.
- 제 13항에 있어서,상기 제 2 기지국에 연관된 셀의 무선 베어러 구성정보 또는 상기 제 2 기지국에 연관된 무선 베어러의 세부 구성정보는,상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀을 통한 무선 베어러로 구성하기 위한 정보인 것을 특징으로 하는 기지국.
- 제 13항에 있어서,상기 제 2 기지국에 연관된 셀의 무선 베어러 구성정보 또는 상기 제 2 기지국에 연관된 무선 베어러의 세부 구성정보는,제 2 기지국 셀 인덱스 정보, 제 2 기지국 셀 식별자 및 상기 단말이 제 2 기지국 셀 무선 베어러 또는 제 2 기지국 무선 베어러를 구별하기 위한 정보 중 적어도 하나 이상의 정보를 포함하는 것을 특징으로 하는 기지국.
- 제 11항에 있어서,상기 핸드오버 메시지는,상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀의 무선 베어러로 구성하기 위한 정보를 포함하는 것을 특징으로 하는 기지국.
- 제 11항에 있어서,상기 단말로 전송되는 상위계층 메시지는상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀의 무선 베어러로 구성하기 위한 정보를 포함하는 것을 특징으로 하는 기지국.
- 제 1 기지국 및 제 2 기지국과 이중 연결을 구성한 상태에서 핸드오버를 수행하는 단말에 있어서,상기 제 1 기지국으로부터 상위계층 메시지를 수신하는 수신부;상기 상위계층 메시지에 기초하여 타켓 기지국에 연관된 셀의 무선 베어러를 구성하는 제어부; 및랜덤 액세스를 통해서 상기 타켓 기지국에 접속하고 핸드오버 완료 정보를 포함하는 상위계층 시그널링을 상기 타켓 기지국으로 전송하는 송신부를 포함하는 단말.
- 제 18항에 있어서,상기 상위계층 메시지는,상기 제 2 기지국에 연관된 셀의 무선 베어러를 상기 타켓 기지국에 연관된 셀을 통한 무선 베어러로 구성하기 위한 정보를 포함하는 것을 특징으로 하는 단말.
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US14/779,957 US9497666B2 (en) | 2013-03-29 | 2014-03-24 | Method for handover in environment connected to multiple base stations and apparatus therefor |
CN201480019499.9A CN105103613B (zh) | 2013-03-29 | 2014-03-24 | 与多个基站连接的状况下的切换方法及其装置 |
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CN112218350A (zh) * | 2017-05-04 | 2021-01-12 | 上海朗帛通信技术有限公司 | 一种被用于无线通信的用户设备、基站中的方法和装置 |
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