WO2010104335A2 - 다중 반송파 시스템에서 핸드 오버를 위한 방법 및 장치 - Google Patents
다중 반송파 시스템에서 핸드 오버를 위한 방법 및 장치 Download PDFInfo
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- WO2010104335A2 WO2010104335A2 PCT/KR2010/001514 KR2010001514W WO2010104335A2 WO 2010104335 A2 WO2010104335 A2 WO 2010104335A2 KR 2010001514 W KR2010001514 W KR 2010001514W WO 2010104335 A2 WO2010104335 A2 WO 2010104335A2
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- carrier
- base station
- 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for performing handover in a wireless communication system supporting multiple carriers.
- Carrier is defined by the center frequency (band frequency) and bandwidth.
- Multi-carrier system is to use a plurality of carriers having a bandwidth less than the total bandwidth.
- LTE Long term evolution
- 3GPP 3rd Generation Partnership Project
- TS Technical Specification
- the 3GPP LTE system supports only one bandwidth (ie, one carrier) of ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz.
- the multi-carrier system uses two carriers having a 20 MHz bandwidth or three carriers having a 20 MHz bandwidth, a 15 MHz bandwidth, and a 5 MHz bandwidth to support a full bandwidth of 40 MHz.
- the multi-carrier system can support backward compatibility with the existing system, and also has an advantage of significantly increasing the data rate through the multi-carrier.
- the wireless communication system provides a communication service by dividing the service area into a plurality of cells in order to overcome the limitation of the service area and the user capacity.
- This is called a multi-cell environment.
- a cell is an area in which a base station provides a communication service, and one base station can provide a service for at least one cell.
- the UE belongs to one cell, and the cell to which the UE belongs is called a serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
- the wireless communication system is different from the wired communication system in that it is necessary to provide endless services to mobile terminals. That is, when the terminal moves the position from the serving cell to the neighbor cell, it is necessary to change the moved neighbor cell to the serving cell to provide a continuous service to the terminal. As such, a procedure of changing a serving cell of the terminal due to the movement of the terminal is referred to as handover.
- the cell to which the terminal originally belongs is called a source cell
- a new cell to which the terminal moves is called a target cell.
- a base station providing a communication service to a source cell is called a source base station
- a base station providing a communication service to a target cell is called a target base station.
- the terminal cannot communicate reliably and adversely affect the quality of service.
- An object of the present invention is to provide a method and apparatus for performing handover in a multi-carrier system.
- Another object of the present invention is to provide a method and apparatus for performing cell search in a multi-carrier system.
- a handover method in a multi-carrier system.
- the method includes the steps of the terminal receiving the multi-carrier measurement information from the base station, the terminal performing the measurement based on the multi-carrier measurement information, the terminal reporting the measurement results to the base station, and the measurement result Performing handover with the target base station through an access reference carrier, which is one of the reported component carriers, wherein the multi-carrier measurement information indicates at least one component carrier in each neighboring cell, and the measurement result corresponds to each neighbor Measurement results for the at least one component carrier in the cell are shown.
- the multi-carrier measurement information may be information about a center frequency for at least one component carrier in each neighbor cell.
- the performing of the handover may include receiving a handover command from the base station, synchronizing with the target base station, transmitting a random access preamble to the target base station, and the random access preamble from the target base station. Receiving a random access response in response.
- Synchronization with the target base station may be performed through the access reference carrier.
- a terminal supporting a multi-carrier includes an RF unit for transmitting and receiving a radio signal, and a processor connected to the RF unit, the processor receives multi-carrier measurement information from a base station, the multi-carrier Perform measurement based on measurement information, report a measurement result to the base station, and perform handover with a target base station through an access reference carrier which is one of component carriers in which the measurement result is reported, wherein the multi-carrier measurement information Denotes at least one component carrier in each peripheral cell, and the measurement result indicates a measurement result for the at least one component carrier in each peripheral cell.
- Communication quality can be improved by minimizing the delay caused by handover. In addition, it is possible to reduce the battery consumption of the terminal used for signal measurement for the multi-carrier.
- 1 shows a wireless communication system.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- FIG. 3 is a flowchart illustrating an example of a successful handover process.
- 5 shows an example of operating a multi-carrier.
- FIG. 6 is a flowchart illustrating a handover process according to an embodiment of the present invention.
- FIG. 8 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- the wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell can in turn be divided into a number of regions (called sectors).
- BS base station
- Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c.
- the cell can in turn be divided into a number of regions (called sectors).
- the user equipment (UE) 12 may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
- MS mobile station
- MT mobile terminal
- UT user terminal
- SS subscriber station
- PDA personal digital assistant
- wireless modem wireless modem
- handheld device handheld device
- the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
- eNB evolved-NodeB
- BTS base transceiver system
- access point and the like. have.
- downlink means communication from the base station to the terminal
- uplink means communication from the terminal to the base station.
- a transmitter may be part of a base station, and a receiver may be part of a terminal.
- a transmitter may be part of a terminal, and a receiver may be part of a base station.
- a radio frame consists of 10 subframes indexed from 0 to 9, and one subframe consists of two slots.
- TTI transmission time interval
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since OFDM symbols use orthogonal frequency division multiple access (OFDMA) in downlink, the OFDM symbols are only intended to represent one symbol period in the time domain, and the limitation on the multiple access scheme or name is not limited. no.
- OFDM symbol may be called another name such as a single carrier frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
- SC-FDMA single carrier frequency division multiple access
- One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of the Cyclic Prefix (CP).
- CP Cyclic Prefix
- one subframe includes 7 OFDM symbols in a normal CP and one subframe includes 6 OFDM symbols in an extended CP.
- a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block may include 7 ⁇ 12 resource elements (REs). Can be.
- REs resource elements
- the primary synchronization signal is transmitted in the last OFDM symbol of the first slot (the first slot of the first subframe (index 0 subframe)) and the 11th slot (the first slot of the sixth subframe (index 5 subframe)). do.
- PSS is used to obtain OFDM symbol synchronization or slot synchronization and is associated with a physical cell identity.
- Primary Synchronization Code (PSC) is a sequence used for PSS, and 3GPP LTE has three PSCs. One of three PSCs is transmitted to the PSS according to the cell ID. The same PSC is used for each of the last OFDM symbols of the first slot and the eleventh slot.
- the secondary synchronization signal includes a first SSS and a second SSS.
- the first SSS and the second SSS are transmitted in an OFDM symbol adjacent to the OFDM symbol in which the PSS is transmitted.
- SSS is used to obtain frame synchronization.
- the SSS is used to obtain a cell ID along with the PSS.
- the first SSS and the second SSS use different Secondary Synchronization Codes (SSCs).
- SSCs Secondary Synchronization Codes
- the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe.
- the PBCH carries system information necessary for the terminal to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
- MIB master information block
- SIB system information block
- PDCH physical downlink control channel
- SIB system information block
- LTE uses a physical downlink shared channel (PDSCH), a physical downlink shared channel (PUSCH) and a physical downlink control channel (PDCCH), a control channel.
- PDSCH Physical Downlink shared channel
- PUSCH physical downlink shared channel
- PUCCH Physical Downlink control Channel
- a downlink control channel includes a Physical Control Format Indicator Channel (PCFICH) and a Physical Hybrid-ARQ Indicator Channel (PHICH).
- PCFICH Physical Control Format Indicator Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- the DCI may include resource allocation of the PDSCH (also called downlink grant), resource allocation of the PUSCH (also called uplink grant), a set of transmit power control commands for individual UEs in any UE group, and / or VoIP (Voice). over Internet Protocol).
- DCI downlink control information
- the DCI may include resource allocation of the PDSCH (also called downlink grant), resource allocation of the PUSCH (also called uplink grant), a set of transmit power control commands for individual UEs in any UE group, and / or VoIP (Voice). over Internet Protocol).
- FIG. 3 is a flowchart illustrating an example of a successful handover process.
- the UE transmits a measurement report to a source BS (S10).
- the source base station determines the handover using the received measurement report.
- the source base station determines the handover to the neighbor cell, the neighbor cell becomes a target cell, and the base station belonging to the target cell becomes the target BS.
- the source base station transmits a handover preparation message to the target base station (S11).
- the target base station performs admission control to increase the likelihood of successful handover.
- the target base station transmits a handover preparation acknowledgment (ACK) message to the source base station (S12).
- the handover preparation ACK message may include a Cell-Radio Network Temporary Identifier (C-RNTI) and / or a dedicated random access preamble.
- C-RNTI is an identifier for distinguishing a terminal in a cell.
- the dedicated random access preamble is used when the UE performs a non-contention based random access procedure as a preamble that can be used exclusively for a certain period of time.
- the random access process may be divided into a contention-based random access process in which the UE uses a random random preamble and a non-competition-based random access process in which the UE uses a dedicated random access preamble.
- the non-competition based random access procedure can prevent the delay of handover due to competition with other terminals compared to the contention based random access procedure.
- the source base station transmits a handover command message to the terminal (S13).
- the handover command message may be transmitted in the form of a radio resource control (RRC) connection reconfiguration (RRC) connection reconfiguration message.
- RRC radio resource control
- the handover command message may include a C-RNTI and a dedicated random access preamble received from the target base station.
- the terminal After receiving the handover command message from the source base station, the terminal synchronizes with the target base station (S14). The terminal receives and synchronizes the PSS and the SSS of the target base station, and receives the PBCH to obtain system information.
- the terminal transmits a random access preamble to the target base station and initiates a random access procedure (S15).
- the UE may use the dedicated random access preamble included in the handover command message. Or, if the dedicated random access preamble is not allocated, the terminal may use a random access preamble selected randomly from the random access preamble set.
- the target base station transmits a random access response message to the terminal (S16).
- the random access response message may include uplink resource allocation and / or timing advance.
- the UE Upon receiving the random access response message, the UE adjusts uplink synchronization based on a time offset, and transmits a handover confirm message to a target base station using the uplink resource allocation (S17).
- the handover confirmation message indicates that the handover process is completed and may be transmitted together with the uplink buffer status report.
- the target base station transmits a path switch request message to the mobility management entity (MME) to inform the MME that the cell of the terminal has been changed (S18).
- MME mobility management entity
- the MME transmits a user plane update request message to a serving-gateway (S-GW) (S19).
- S-GW serving-gateway
- the S-GW switches the downlink data path to the target base station (S20).
- the S-GW transmits a User Plane Update Response message to the MME (S21).
- the MME transmits a path switch request ACK message to the target base station (S22).
- the target base station sends a resource release message to the source base station to inform the success of the handover (S23).
- the source base station releases the resources associated with the terminal (S24).
- the 3GPP LTE system supports a case where the downlink bandwidth and the uplink bandwidth are set differently, but this assumes one component carrier (CC). This means that 3GPP LTE is supported only when the bandwidth of the downlink and the bandwidth of the uplink are the same or different in a situation in which one component carrier is defined for the downlink and the uplink, respectively.
- the 3GPP LTE system supports up to 20MHz and may have different uplink and downlink bandwidths, but only one component carrier is supported for uplink and downlink.
- Spectrum aggregation (or bandwidth aggregation, also called carrier aggregation) is to support a plurality of component carriers.
- Spectral aggregation is introduced to support increased throughput, to prevent cost increases due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if five component carriers are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
- RF radio frequency
- Spectral aggregation can be divided into contiguous spectral aggregation where aggregation is between successive carriers in the frequency domain and non-contiguous spectral aggregation where aggregation is between discontinuous carriers.
- the number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink carriers and the number of uplink carriers are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
- the size (ie, bandwidth) of component carriers may be different from each other. For example, assuming that five component carriers are used for the configuration of the 70 MHz band, a 5 MHz carrier (carrier # 0) + 20 MHz carrier (carrier # 1) + 20 MHz carrier (carrier # 2) + 20 MHz carrier (carrier # 3 ) + 5MHz carrier (carrier # 4) may be configured.
- a multiple carrier system refers to a system supporting multiple carriers based on spectral aggregation.
- Adjacent spectral and / or non-adjacent spectral aggregation may be used in a multi-carrier system, and either symmetric or asymmetric aggregation may be used.
- CC 4 shows an example of operating a multi-carrier.
- DL CC # 1 and DL CC # 2 are activated, and these are called activated carriers, and DL CC # 3 and DL CC # 4 are deactivated, and these are called deactivated carriers.
- UL CC # 1 and UL CC # 2 are active carrier waves, and UL CC # 3 is an inactive carrier wave.
- An active carrier is a carrier that can transmit or receive control information or data packets. Inactive carriers are not capable of transmitting or receiving data packets, but at least operations such as signal measurement are possible.
- the active carrier and the inactive carrier are not fixed, but each CC may be deactivated or activated by negotiation with the base station and the terminal.
- An inactive carrier is also called a candidate carrier in that it can be activated.
- At least one of the active carriers may be set as a reference carrier.
- the reference carrier is called an anchor carrier or a primary carrier.
- An active carrier other than a reference carrier is called a secondary carrier.
- the reference carrier is a carrier on which control information is transmitted on a downlink control channel (eg, PDCCH) or common control information for multiple carriers.
- a mobility management or carrier activation / deactivation message may be transmitted through the reference carrier.
- the reference carrier may be defined for uplink as well as downlink.
- the uplink reference carrier may be used to transmit at least one of uplink control information (UCI), an HARQ ACK / NACK signal, and a channel quality indicator (CQI).
- the uplink reference carrier may be used to perform handover or to perform initial access such as transmission of a random access preamble.
- 5 shows an example of operating a multi-carrier.
- the base station first notifies the user equipment of higher carrier allocation information through an upper layer message such as an RRC message (S110).
- the uplink carrier assignment information indicates information on an active downlink / uplink carrier available between the terminal and the base station.
- the uplink carrier allocation information includes information on setting a reference carrier.
- the base station informs the UE of the lower carrier allocation information through dynamic signaling such as PDCCH (S120).
- the lower carrier assignment information may indicate a carrier used among possible active carriers received through the higher carrier assignment information.
- the lower carrier allocation information may override the upper carrier allocation information.
- FIG. 6 is a flowchart illustrating a handover process according to an embodiment of the present invention.
- the source base station sends the multi-carrier measurement information to the terminal (S210).
- the terminal performs the measurement based on the multi-carrier measurement information (S220).
- the multi-carrier measurement information includes information about a CC that has performed measurement among CCs of a neighbor cell.
- the multi-carrier measurement information indicates information on at least one CC measured among a plurality of CCs used (or activated) in each cell.
- an example of multicarrier measurement information may be represented as follows.
- cf1 and cf2 are center frequencies of the measured CCs, respectively.
- C1 measures two CCs, and C2 measures one CC, but the number of CCs measured is not limited.
- the size of the message used for the measurement report increases, which may cause overhead. Therefore, by using the multi-carrier measurement information, by limiting the measurement to only a part of the CC, to reduce the burden due to measurement and measurement reporting. The battery consumption of the terminal used for the measurement can be reduced, and signaling overhead can be reduced.
- At least one of the measured CCs may be used as an access reference carrier for handover, which will be described later.
- priority may be given to the plurality of CCs.
- the higher priority CC is measured first, and when the signal strength is lower than the reference value, the lower priority CC is measured.
- the terminal transmits a measurement report to the source base station (S230).
- the measurement report may be transmitted through an uplink CC linked with a downlink CC through which multi-carrier measurement information is transmitted.
- the measurement report may be transmitted through an uplink reference carrier.
- the source base station After determining whether to handover using the received measurement report, the source base station transmits a handover preparation message to the target base station (S240).
- the target base station transmits a handover preparation ACK message to the source base station (S250).
- the handover preparation ACK message may include a Cell-Radio Network Temporary Identifier (C-RNTI) and / or a dedicated random access preamble.
- C-RNTI Cell-Radio Network Temporary Identifier
- the source base station transmits a handover command message to the terminal (S260).
- the handover command message may include a C-RNTI and a dedicated random access preamble received from the target base station.
- the handover command message may be transmitted through a downlink reference carrier.
- the information on the multi-carrier is unnecessary separately in the handover command message. Therefore, compatibility with the existing single carrier can be maintained.
- the handover command message may include information about multi-carrier configuration of the target base station.
- the multi-carrier configuration information represents information about a CC used as a multi-carrier capability of the target base station and / or an access uplink / downlink reference carrier.
- the access reference carrier refers to a carrier that the terminal initially uses to access the target base station, and may use one or more CCs.
- the terminal After receiving the handover command message from the source base station, the terminal synchronizes with the target base station (S270).
- the terminal receives and synchronizes the PSS and the SSS of the target base station, and receives the MIB and / or SIB to obtain system information.
- the downlink CC used for synchronization may be a downlink CC used for cell measurement. This is called an access downlink reference carrier.
- the terminal transmits a random access preamble to the target base station, and initiates a random access process (S280).
- the UE may use the dedicated random access preamble included in the handover command message.
- the random access preamble may be transmitted through an access uplink reference carrier, and information about the access uplink reference carrier may be obtained through a handover command message.
- the target base station transmits a random access response message to the terminal (S290).
- the random access response message may be transmitted on the access downlink reference carrier.
- the terminal transmits a Handover Confirm message to the target base station to indicate completion of the handover process (S295).
- FIG 7 shows another example of a handover process.
- the left figure shows before handover initiation, and the right figure shows in handover.
- the terminal 200 may use two CCs. Before starting the handover, the terminal 200 communicates with the serving base station 210 through the first CC 281 and the second CC 282.
- the terminal 200 When the handover is initiated by the handover command of the serving base station 210, the terminal 200 continues to communicate with the serving base station 210 through the first CC 281, but the target base station through the second CC 282. Handover with 220 is performed.
- the terminal may terminate the connection with the serving base station 210 through the first CC.
- the target base station 220 may inform the serving base station 210 of the release information to release the connection.
- the serving base station 210 receiving the release information may notify the terminal of the release.
- the terminal may obtain a new carrier assignment from the new serving base station 220.
- the base station does not always allocate as many CCs corresponding to the capabilities of the terminal.
- the terminal has three multi-carrier capabilities, only two carriers are currently allocated, handover may be performed through the remaining one carrier.
- FIG. 8 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 10 includes a processor 11, a memory 12, and a radio frequency unit (RF) 13.
- RF radio frequency unit
- the processor 11 implements the proposed functions, processes and / or methods.
- the above-described operation of the base station 10 may be implemented by the processor 11.
- the processor 11 supports operations for multiple carriers and performs handover.
- the memory 12 is connected to the processor 11 to store protocols or parameters for multi-carrier operation.
- the RF unit 13 is connected to the processor 11 and transmits and / or receives a radio signal.
- the terminal 20 includes a processor 21, a memory 22, and an RF unit 23.
- the processor 21 implements the proposed functions, processes and / or methods.
- the above-described operation of the terminal 20 may be implemented by the processor 21.
- the processor 21 supports multi-carrier operation and performs handover.
- the memory 22 is connected to the processor 21 to store protocols or parameters for multi-carrier operation.
- the RF unit 23 is connected to the processor 21 to transmit and / or receive a radio signal.
- Processors 11 and 21 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memories 12 and 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the RF unit 13 and 23 may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. Modules may be stored in memories 12 and 22 and executed by processors 11 and 21.
- the memories 12 and 22 may be inside or outside the processors 11 and 21, and may be connected to the processors 11 and 21 by various well-known means.
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Abstract
Description
C1= { cf1, cf2 }C2= { cf1 } |
Claims (12)
- 다중 반송파 시스템에서 핸드오버 방법에 있어서,단말이 다중 반송파 측정 정보를 기지국으로부터 수신하는 단계;상기 단말이 상기 다중 반송파 측정 정보를 기반으로 측정을 수행하는 단계;상기 단말이 측정 결과를 상기 기지국으로 보고하는 단계; 및상기 측정 결과가 보고된 요소 반송파 중 하나인 접속 기준 반송파를 통해 타깃 기지국과 핸드오버를 수행하는 단계를 포함하되,상기 다중 반송파 측정 정보는 각 주변 셀 내의 적어도 하나의 요소 반송파를 나타내고,상기 측정 결과는 각 주변 셀 내의 상기 적어도 하나의 요소 반송파에 대한 측정 결과를 나타내는 방법.
- 제 1 항에 있어서, 상기 다중 반송파 측정 정보는 각 주변 셀 내의 적어도 하나의 요소 반송파에 대한 중심 주파수에 관한 정보인 방법.
- 제 1 항에 있어서, 상기 핸드오버를 수행하는 단계는상기 기지국으로부터 핸드오버 명령을 수신하는 단계;상기 타깃 기지국과 동기화하는 단계;상기 타깃 기지국으로 랜덤 액세스 프리앰블을 전송하는 단계; 및상기 타깃 기지국으로부터 상기 랜덤 액세스 프리앰블에 대한 응답으로 랜덤 액세스 응답을 수신하는 단계를 포함하는 방법.
- 제 3 항에 있어서, 상기 타깃 기지국과의 동기화는 상기 접속 기준 반송파를 통해 수행되는 방법.
- 제 3 항에 있어서, 상기 랜덤 액세스 프리앰블이 전송되는 상향링크 반송파에 관한 정보는 상기 핸드오버 명령에 포함되는 방법.
- 제 3 항에 있어서, 상기 랜덤 액세스 프리앰블에 관한 정보는 상기 핸드오버 명령에 포함되는 방법.
- 다중 반송파를 지원하는 단말에 있어서,무선 신호를 송신 및 수신하는 RF부; 및상기 RF 부와 연결되는 프로세서를 포함하되, 상기 프로세서는다중 반송파 측정 정보를 기지국으로부터 수신하고,상기 다중 반송파 측정 정보를 기반으로 측정을 수행하고,측정 결과를 상기 기지국으로 보고하고, 및상기 측정 결과가 보고된 요소 반송파 중 하나인 접속 기준 반송파를 통해 타깃 기지국과 핸드오버를 수행하되,상기 다중 반송파 측정 정보는 각 주변 셀 내의 적어도 하나의 요소 반송파를 나타내고,상기 측정 결과는 각 주변 셀 내의 상기 적어도 하나의 요소 반송파에 대한 측정 결과를 나타내는 단말.
- 제 7 항에 있어서, 상기 다중 반송파 측정 정보는 각 주변 셀 내의 적어도 하나의 요소 반송파에 대한 중심 주파수에 관한 정보인 단말.
- 제 7 항에 있어서, 상기 프로세서는상기 기지국으로부터 핸드오버 명령을 수신하고,상기 타깃 기지국과 동기화하고,상기 타깃 기지국으로 랜덤 액세스 프리앰블을 전송하고, 및상기 타깃 기지국으로부터 상기 랜덤 액세스 프리앰블에 대한 응답으로 랜덤 액세스 응답을 수신하여, 상기 핸드오버를 수행하는 단말.
- 제 9 항에 있어서, 상기 타깃 기지국과의 동기화는 상기 접속 기준 반송파를 통해 수행되는 단말.
- 제 9 항에 있어서, 상기 랜덤 액세스 프리앰블이 전송되는 상향링크 반송파에 관한 정보는 상기 핸드오버 명령에 포함되는 단말.
- 제 9 항에 있어서, 상기 랜덤 액세스 프리앰블에 관한 정보는 상기 핸드오버 명령에 포함되는 단말.
Priority Applications (2)
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CA2755233A CA2755233A1 (en) | 2009-03-11 | 2010-03-11 | Method and apparatus for handover in a multi-carrier system |
US13/255,832 US20120026977A1 (en) | 2009-03-11 | 2010-03-11 | Method and apparatus for handover in a multi-carrier system |
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US15943009P | 2009-03-11 | 2009-03-11 | |
US61/159,430 | 2009-03-11 | ||
US22405909P | 2009-07-09 | 2009-07-09 | |
US61/224,059 | 2009-07-09 | ||
KR1020100021570A KR20100102561A (ko) | 2009-03-11 | 2010-03-11 | 다중 반송파 시스템에서 핸드 오버를 위한 방법 및 장치 |
KR10-2010-0021570 | 2010-03-11 |
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WO2010104335A2 true WO2010104335A2 (ko) | 2010-09-16 |
WO2010104335A3 WO2010104335A3 (ko) | 2010-12-09 |
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US (1) | US20120026977A1 (ko) |
CA (1) | CA2755233A1 (ko) |
WO (1) | WO2010104335A2 (ko) |
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Also Published As
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WO2010104335A3 (ko) | 2010-12-09 |
US20120026977A1 (en) | 2012-02-02 |
CA2755233A1 (en) | 2010-09-16 |
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