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WO2014059672A1 - 小区切换与重配的方法和装置 - Google Patents

小区切换与重配的方法和装置 Download PDF

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Publication number
WO2014059672A1
WO2014059672A1 PCT/CN2012/083235 CN2012083235W WO2014059672A1 WO 2014059672 A1 WO2014059672 A1 WO 2014059672A1 CN 2012083235 W CN2012083235 W CN 2012083235W WO 2014059672 A1 WO2014059672 A1 WO 2014059672A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
uplink
target base
time advance
information
Prior art date
Application number
PCT/CN2012/083235
Other languages
English (en)
French (fr)
Inventor
王轶
张磊
徐海博
Original Assignee
富士通株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士通株式会社 filed Critical 富士通株式会社
Priority to CN201280076303.0A priority Critical patent/CN104737584B/zh
Priority to KR1020157012189A priority patent/KR101689490B1/ko
Priority to EP12886831.2A priority patent/EP2911449B1/en
Priority to PCT/CN2012/083235 priority patent/WO2014059672A1/zh
Priority to JP2015537100A priority patent/JP6179597B2/ja
Publication of WO2014059672A1 publication Critical patent/WO2014059672A1/zh
Priority to US14/688,471 priority patent/US10187829B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/08Testing, supervising or monitoring using real traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0072Transmission or use of information for re-establishing the radio link of resource information of target access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837Determination of triggering parameters for hand-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and apparatus for cell handover and reconfiguration. Background technique
  • the traditional macro base station may not be able to cope with such a rapidly growing capacity and peak. Rate requirement.
  • the traditional macro base station may not be able to cope with such a rapidly growing capacity and peak. Rate requirement.
  • the user is closer to the base station in physical location, which can increase system capacity, increase peak rates, and improve user terminal experience.
  • the deployment of high-power macro base stations can lead to problems such as high cost and non-green communication. Therefore, people began to consider the use of low-power small cells, such as Pico cell, Femto cell, and RRH (Remote Radio Head).
  • small base stations have the advantages of low cost, fast and flexible deployment, and high cost performance.
  • small base stations are suitable for outdoor hotspots, increase network capacity, improve indoor deep coverage, and enhance user perception. Therefore, small base stations will receive more and more attention from the industry. In future LTE-Advanced networks, the number of small base stations will exceed that of traditional macro stations.
  • the coverage of the small base station is smaller than that of the macro base station, and a higher available frequency band can be utilized, such as 3.5 GHz, while the macro base station continues to use the existing relatively lower frequency band to provide larger and relatively robust coverage.
  • a user UE, User Equipment
  • CA carrier aggregation
  • a macro base station and a small base station can be configured for the user at the same time.
  • the two base stations work at different frequency points, that is, different carrier components ( CC, Carrier Component) 0
  • the small base station may be within the coverage of the macro base station or may be outside the coverage of the macro base station.
  • the deployment of small base stations can be sparse or dense.
  • the small base stations may appear in the form of clusters, that is, each small base station relatively geographically close to be divided into one cluster.
  • each small base station can be connected to the same eNB (evolved Node B, evolved base station). Then, the backhaul between the small base stations in the cluster can be considered as ideal, such as small delay and strong transmission capability.
  • Different clusters within the coverage of the macro base station can be connected to different eNBs or also connected to the same eNB.
  • Figure 1 is a schematic diagram of a small base station and a macro base station jointly deployed. As shown in Figure 1, F2 is used to deploy a small base station, and F1 is used to deploy a macro base station.
  • the inventors have found that when users move between small base stations in the same cluster, If the traditional cell handover procedure is still adopted, the user will be in a frequent handover state, which increases the burden on the user side, and the user interacts with the base station and the base station and the base station with a large amount of unnecessary information.
  • a method for cell handover and reconfiguration includes:
  • the user equipment performs cell measurement according to the cell measurement request and reports the measurement result;
  • the UE When receiving the handover command sent by the macro base station or the serving base station of the UE, the UE disconnects from the serving base station and reserves the uplink time adjustment parameter NTA of the serving base station ;
  • the UE performs cell handover and reconfiguration according to the handover command.
  • a method for cell handover and reconfiguration includes:
  • the macro base station determines a target base station selected for the UE
  • the UE After receiving the handover command, the UE disconnects from the serving base station and reserves the uplink time adjustment parameter N TA of the serving base station.
  • a method for cell handover and reconfiguration includes:
  • the uplink time advance is provided to the macro base station.
  • a method for cell handover and reconfiguration is provided, where Methods include:
  • the base station sends a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request;
  • the base station After receiving the cell measurement result reported by the UE, the base station selects a target base station for the UE according to the cell measurement result;
  • a user equipment UE
  • the UE includes:
  • a measuring unit which performs cell measurement according to the cell measurement request and reports the measurement result
  • a processing unit when receiving a handover command sent by the macro base station or the serving base station of the UE, disconnecting from the serving base station and retaining the uplink time adjustment parameter NTA of the serving base station ;
  • a macro base station includes: a determining unit, which is determined to be a target base station selected by the UE;
  • a sending unit configured to send a handover command to the UE, so that the UE performs handover and reconfiguration according to the handover command;
  • the UE After receiving the handover command, the UE disconnects from the serving base station and reserves the uplink time adjustment parameter N TA of the serving base station.
  • a base station includes: a detecting unit that detects an uplink signal of the UE according to control of another base station other than the local; an acquiring unit that acquires the UE Relative to the local uplink timing information;
  • a calculating unit configured to calculate a local uplink time advance amount according to the uplink timing information
  • a processing unit that provides the uplink timing advance to the macro base station.
  • a base station configured to include: a sending unit, configured to send a cell measurement request to the UE, so that the UE performs the cell measurement according to the cell measurement request and reports the packet;
  • a selecting unit after receiving the cell measurement result reported by the UE, selecting a target base station for the UE according to the cell measurement result;
  • a control unit configured to control the target base station to detect an uplink signal to obtain uplink time advance information of the target base station.
  • a method for cell handover and reconfiguration includes:
  • the user equipment performs cell measurement according to the cell measurement request of the serving base station and reports the measurement result; after receiving the handover command sent by the serving base station, the UE disconnects the connection with the serving base station and reserves the uplink time adjustment parameter of the serving base station.
  • N TA The user equipment
  • the UE performs cell handover and reconfiguration according to the handover command.
  • a method for cell handover and reconfiguration includes:
  • a method for cell handover and reconfiguration includes:
  • a user equipment UE
  • the UE includes:
  • the processing unit disconnects the connection with the serving base station and retains the uplink time adjustment parameter of the serving base station after receiving the handover command sent by the serving base station N TA;
  • a base station includes: a sending unit, which sends a cell measurement request to the UE, so that the UE performs cell measurement according to the cell measurement request and reports the cell;
  • a selecting unit after receiving the cell measurement result reported by the UE, selecting a target base station for the UE according to the cell measurement result;
  • control unit which controls the target base station to detect an uplink signal to obtain time advance information of the target base station, where the sending unit is further configured to send a handover command to the UE, so that the UE performs cell handover according to the handover command.
  • the UE After receiving the handover command, the UE disconnects from the serving base station and reserves the uplink time adjustment parameter N TA of the serving base station.
  • a base station includes: a detecting unit, which detects an uplink signal of the UE according to a control of a serving base station of the UE;
  • An acquiring unit which acquires uplink timing information of the UE relative to the local;
  • a calculating unit configured to calculate a local uplink time advance amount according to the uplink timing information
  • a processing unit that provides the uplink timing advance to the serving base station of the UE.
  • the communication system comprises the UE according to the fifth aspect of the invention, and the macro base station according to the sixth aspect, and the seventh aspect The target base station, and the serving base station according to the eighth aspect.
  • a communication system includes the UE according to the twelfth aspect, and the service base station according to the thirteenth aspect, and the fourteenth aspect The target base station.
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to perform the aforementioned cell handover and reconfiguration performed in the base station in the base station Methods.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the aforementioned method of cell handover and reconfiguration performed in a base station in a base station.
  • a computer readable program wherein when the program is executed in a terminal device, the program causes the computer to perform the aforementioned execution in the UE in the terminal device Cell switching and reconfiguration method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the aforementioned method of cell switching and reconfiguration performed in a UE in a terminal device .
  • the beneficial effects of the embodiments of the present invention are as follows:
  • the method and the device in the embodiment of the present invention effectively reduce the delay caused by the uplink and downlink synchronization in the cell reconfiguration and handover process, and reduce the complexity of the user.
  • 1 is a schematic diagram of a joint deployment of a small base station and a macro base station
  • FIG. 2 is a flowchart of a method for cell handover and reconfiguration according to Embodiment 1 of the present invention
  • FIG. 2A-2D are four embodiments of the embodiment shown in FIG. 2;
  • FIG. 3 is a flowchart of a method for cell handover and reconfiguration according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a method for cell handover and reconfiguration according to Embodiment 4 of the present invention.
  • Embodiment 6 is a schematic diagram of information interaction of each device involved in Embodiment 1-4; 7 is a schematic structural diagram of a user equipment according to Embodiment 5 of the present invention;
  • FIG. 8 is a schematic diagram showing the composition of a macro base station according to Embodiment 6 of the present invention.
  • FIG. 9 is a schematic diagram showing the composition of a target base station according to Embodiment 7 of the present invention.
  • Figure 10 is a schematic diagram showing the composition of a serving base station according to Embodiment 8 of the present invention.
  • FIG. 11 is a flowchart of a method for cell handover and reconfiguration according to Embodiment 9 of the present invention.
  • FIG. 12 is a flowchart of a method for cell handover and reconfiguration according to Embodiment 10 of the present invention.
  • FIG. 13 is a flowchart of a method for cell handover and reconfiguration according to Embodiment 11 of the present invention.
  • Figure 14 is a schematic diagram of information exchange of each device involved in Embodiment 9-11;
  • FIG. 15 is a schematic structural diagram of a UE according to Embodiment 12 of the present invention.
  • FIG. 16 is a schematic diagram showing the composition of a serving base station according to Embodiment 13 of the present invention.
  • Figure 17 is a diagram showing the composition of a target base station according to Embodiment 14 of the present invention. detailed description
  • the embodiment of the invention provides a method for cell handover and reconfiguration, which is applied to a user equipment (UE).
  • UE user equipment
  • 2 is a flow chart of the method. Referring to FIG. 2, the method includes:
  • Step 201 The user equipment (UE) performs cell measurement according to the cell measurement request and reports the measurement result.
  • the cell measurement request may be sent by the macro base station, or may be sent by the small base station (referred to as the serving base station) serving the UE.
  • the macro base station or the serving base station notifies the UE to perform a cell according to the service requirement, wherein the UE performs measurement on the local cell and the neighboring cell based on the cell measurement request of the base station, for example, measuring a carrier receiver signal strength indicator (Carrier RSSI), RSRP (Reference Signal Receiving Power), and/or RSRQ (Reference Signal Receiving Quality).
  • Carrier RSSI Carrier RSSI
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal Receiving Quality
  • the UE may adopt the same measurement mode as the existing cell handover, or the same measurement mode as the carrier component reconfiguration in the existing carrier aggregation (CA), or a simplified measurement mode.
  • the embodiments of the present invention are not limited thereto.
  • Step 202 After receiving the handover command sent by the macro base station or the serving base station, the UE disconnects from the serving base station and retains the uplink time adjustment parameter NTA of the original serving base station ;
  • the handover command may be implemented in an existing RRC (Radio Resource Control) configuration, reconfiguration signaling, or may be implemented by pre-defined RRC configuration and reconfiguration signaling.
  • RRC Radio Resource Control
  • reconfiguration signaling it may be the same as the RRC configuration, reconfiguration signaling used in the reconfiguration of carrier components in a conventional carrier aggregation (CA), or further simplified, or modified certain parameters.
  • PCI physical cell ID
  • the virtual cell ID is included (assuming that each small base station in a cluster uses the same PCI but uses a different virtual cell ID).
  • the disconnection of the UE from the serving base station refers to releasing the parameters of the serving base station.
  • the UE in order to determine the uplink transmission time, the UE needs to reserve the uplink time adjustment parameter N TA of the original serving base station.
  • the UE may also retain the downlink timing information of the serving base station, or may not retain the downlink timing information.
  • the serving base station refers to a small cell that currently provides services for the UE, instead of a macro base station.
  • Step 203 The UE performs cell handover and reconfiguration according to the handover command.
  • the UE can use the existing means to perform cell switching and reconfiguration, and the embodiment of the present invention is not limited thereto.
  • the original serving base station provides a buffer buffered and transit packets to target eNB to the target base station, and sends a sequence number status (SN Status, Sequence Number Status) to the target base station (SN status). Transfer ), then transmit data to the target base station, and the target base station can receive the buffer packets from the source eNB.
  • the downlink synchronization of the UE and the target base station may perform downlink time synchronization on the target base station when the UE has not switched to the target base station. It is also possible to start downlink time synchronization of the target base station after the UE receives the reconfiguration information. This embodiment is not intended to be limiting.
  • the method in this embodiment further includes:
  • Step 204 After receiving the uplink resource allocation information sent by the macro base station or the target base station, the UE feeds back the reconfiguration completion information to the macro base station or the target base station according to the uplink resource allocation information.
  • the UE directly feeds back the reconfiguration completion information to the macro base station after the reconfiguration is completed. If the uplink resource allocation information is sent by the target base station, the UE is reconfigured. The reconfiguration completion information is fed back to the target base station.
  • the UE in order to send uplink data to the target base station, for example, to feed back the reconfiguration completion information to the target base station, the UE also determines the uplink transmission time. Therefore, in this embodiment, the method in this embodiment further includes: Step 205: When the UE receives the time advance command including the uplink time advance information of the target base station, according to the NTA value of the reserved serving base station and the The TA information in the TA command is used to determine the uplink transmission time.
  • the ⁇ command may be transmitted by using the RRC reconfiguration information of step 202, for example, adding a ⁇ command field to the original RRC reconfiguration signaling;
  • the uplink resource allocation information is transmitted, for example, by a random access response (RAR); it can also be transmitted through existing MAC signaling (referred to as predetermined MAC signaling), that is, reuse existing MAC signaling.
  • RAR random access response
  • predetermined MAC signaling existing referred to as predetermined MAC signaling
  • the target base station can obtain the TA value of the target base station by calculating the uplink signal of the UE.
  • the target base station can make the macro base station learn the TA value by interacting with the macro base station.
  • the target base station can make the original serving base station of the UE learn the TA value by interacting with the original serving base station of the UE. This embodiment is not limited to a specific interaction method.
  • N TA —. Ld is the NTA value of the serving base station reserved by the UE
  • TA is the TA value in the TA information of the received target base station.
  • N TA ⁇ . Ld is the N TA value before the new TA command is received
  • N TA — new is the N TA after the TA command is received.
  • N TA value of ld is the uplink transmission time.
  • the UE determines that the uplink sending time may be in at least three manners.
  • the UE may use the downlink timing information of the target base station as a reference, and send the uplink signal by using the N TA new sampling points as the uplink sending time in advance, where the N TA — new is equal to the UE reserved.
  • the NTA value of the original serving base station plus the TA value received by the UE last time.
  • the UE may also receive the uplink TA command as described in step 206.
  • the downlink timing information of the original serving base station is used as a reference, and the uplink signal is sent as the uplink transmission time in advance by the N TA new sampling points, where the N TA — new is equal to the original reserved by the UE.
  • the N TA new sampling points are sent in advance as the uplink transmission time to send an uplink signal, and the N TA — new is equal to N TA _.
  • the ld value is added to the received TA value.
  • the UE may also obtain the measured The downlink timing difference ⁇ ⁇ , with the downlink timing information of the target base station as a reference, when the first time advance command is received, the uplink signal is sent in advance by the N TA new + A t sampling points as the uplink transmission time, and is received. To the subsequent TA command (except for the first time advance command other than the first time advance command)
  • the N TA _new sampling points transmit uplink signals as uplink transmission times.
  • the execution order of each step is not limited.
  • the time advance command may be in the uplink resource allocation information, or in the uplink resource allocation information, or may be in the feedback reconfiguration after the uplink resource allocation information.
  • the specific implementation can be determined according to the actual situation.
  • each step of the method in this embodiment may be in the following sequence: Step 201a: The UE performs cell measurement according to the cell measurement request and reports the measurement result;
  • Step 202a After receiving the handover command sent by the macro base station, the UE disconnects the serving base station and reserves the uplink time adjustment parameter N TA of the original serving base station, and performs cell handover and reconfiguration according to the handover command. ;
  • Step 203a After receiving the uplink resource allocation information sent by the macro base station, the UE feeds back the reconfiguration completion information to the macro base station after the reconfiguration is completed.
  • Step 204a the UE before transmitting uplink data to the target base station, in accordance with the value of N TA original serving base station and the received reservation command ⁇ ⁇ information including target base station determines an uplink transmission time.
  • the ⁇ command including the ⁇ information of the target base station may be transmitted by using the handover command of step 202a, or by the uplink resource allocation information of step 204a, or by a MAC signaling before step 204a.
  • Step 201b The UE performs cell measurement according to the cell measurement request and reports the measurement result.
  • Step 202b After receiving the handover command sent by the macro base station, the UE disconnects the connection with the serving base station and retains the uplink time adjustment parameter of the original serving base station. N TA , and performing cell handover and reconfiguration according to the handover command;
  • Step 203b the UE after receiving the TA information contains the target base station TA command TA value N in accordance with the information ⁇ original serving base station and the target base station retains determining uplink transmission timing;
  • Step 204b After receiving the uplink resource allocation information sent by the target base station, the UE feeds back the reconfiguration complete information to the target base station at the determined uplink sending time after the reconfiguration is completed.
  • the TA command including the TA information of the target base station may be transmitted by using the handover command of step 202b or by the uplink resource allocation information of step 204b.
  • the UE first receives the uplink resource allocation including the TA command.
  • the information is determined by the uplink transmission time) or transmitted by a MAC signaling before step 203b.
  • Step 201c The UE performs cell measurement according to the cell measurement request and reports the measurement result;
  • Step 202c After receiving the handover command sent by the serving base station, the UE disconnects the serving base station and reserves the uplink time adjustment parameter N TA of the original serving base station, and performs cell handover and reconfiguration according to the handover command. ;
  • Step 203c After receiving the uplink resource allocation information sent by the macro base station, the UE feeds back the reconfiguration completion information to the macro base station after the reconfiguration is completed.
  • Step 204c the UE before transmitting uplink data to the target base station, in accordance with the value of N TA original serving base station and the received reservation command ⁇ ⁇ information including target base station determines an uplink transmission time.
  • Step 201d The UE performs cell measurement according to the cell measurement request and reports the measurement result;
  • Step 202d After receiving the handover command sent by the serving base station, the UE disconnects the serving base station and reserves the uplink time adjustment parameter NTA of the original serving base station, and performs cell handover and reconfiguration according to the handover command. ;
  • Step 203d After receiving the TA command including the TA information of the target base station, the UE determines an uplink sending time according to the reserved NTA value of the original serving base station and the TA information of the target base station.
  • Step 204d After receiving the uplink resource allocation information sent by the target base station, the UE feeds back the reconfiguration complete information to the target base station at the determined uplink sending time after the reconfiguration is completed.
  • the TA command including the TA information of the target base station is transmitted by the handover command of step 202d.
  • the target base station detects the uplink signal of the UE to obtain uplink synchronization between the UE and the target base station. Therefore, the data transmission between the UE and the original serving base station is not affected.
  • the macro base station instructs the UE to replace the originally configured serving base station with the new target base station by transmitting a handover command (RRC reconfiguration information of the target base station) to the UE, and transmits its uplink synchronization information with the new target base station. Therefore, the UE establishes downlink synchronization/uplink synchronization with the new target base station, which effectively reduces the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process and reduces the complexity of the UE.
  • the embodiment of the invention further provides a method for cell handover and reconfiguration, which is applied to a macro base station.
  • Figure 3 is a flow chart of the method. Referring to Figure 3, the method includes:
  • Step 301 The macro base station determines a target base station selected by the UE.
  • Step 302 The macro base station sends a handover command to the UE, so that the UE performs cell handover and reconfiguration according to the handover command.
  • the UE After receiving the handover command, the UE disconnects from the serving base station and retains the uplink time adjustment parameter N TA of the original serving base station.
  • step 301 the macro base station notifies the UE to perform cell measurement, whereby the macro base station can select the target base station for the UE itself.
  • step 301 can include the following steps:
  • the macro base station sends a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request.
  • the measurement request may be implemented by using signaling, or may be implemented by using a control instruction, which is not limited by this embodiment.
  • the macro base station After receiving the cell measurement result reported by the UE, the macro base station selects a target base station for the UE according to the cell measurement result.
  • the method for performing cell measurement by the UE is the same as that of Embodiment 1, and the content thereof is incorporated herein, and details are not described herein again.
  • the macro base station selects a target base station for the UE according to the measurement result of the UE, and uses it as the serving base station of the UE.
  • the target base station starts detecting the uplink signal of the UE at a certain time according to the control of the macro base station (for example, An uplink channel sounding reference signal (SRS), or an uplink data channel (PUSCH), to obtain an uplink timing of the UE relative to the target base station, and generate corresponding uplink time advance (TA) information according to the uplink timing.
  • SRS uplink channel sounding reference signal
  • PUSCH uplink data channel
  • TA uplink time advance
  • the original serving base station of the UE notifies the UE to perform cell measurement, and the original serving base station of the UE or the control base station in the same cluster as the original serving base station of the UE may be fed back according to the UE.
  • the measurement result selects the target base station for the UE.
  • the macro base station is located in the same cell from the original serving base station of the UE or the original serving base station of the UE by interacting with the original serving base station of the UE or the control base station in the same cluster as the original serving base station of the UE.
  • the control base station in the cluster obtains the TA information of the target base station.
  • the macro base station determines, according to the serving base station of the UE or the control base station that is located in the same cluster as the serving base station of the UE, the target base station selected by the UE, and determines that the UE is selected by the UE.
  • Target base station determines, according to the serving base station of the UE or the control base station that is located in the same cluster as the serving base station of the UE, the target base station selected by the UE, and determines that the UE is selected by the UE.
  • Target base station determines, according to the serving base station of the UE or the control base station that is located in the same cluster as the serving base station of the UE.
  • the macro base station may further send uplink resource allocation (UL allocation/grant) information to the UE, so that the UE reports the reconfiguration complete information to the macro base station after the reconfiguration is completed.
  • uplink resource allocation UL allocation/grant
  • the macro base station may further send a time advance (TA) information time advance command (TAC) including the target base station to the UE, so that the UE adjusts parameters according to the uplink time of the reserved serving base station and the target base station.
  • the time advance information determines the uplink transmission time.
  • the TAC may be sent by using the foregoing handover command, or may be sent by using the foregoing uplink resource allocation information, or may be sent by using an existing MAC command.
  • an appropriate mechanism may be used to prevent the UE from being able to distinguish whether the TA sent by the macro base station is applicable to the macro base station itself or to the target base station. The specific mechanism is not limited herein.
  • the processing on the UE side has been described in detail in Embodiment 1, and details are not described herein again.
  • the target base station when the UE is still connected to the original serving base station, the target base station detects the uplink signal of the UE to obtain uplink synchronization between the UE and the target base station.
  • the macro base station instructs the UE to replace the originally configured serving base station with the new target base station by transmitting a handover command (RRC reconfiguration information of the target base station) to the UE, and transmits its uplink synchronization information with the new target base station. Therefore, the UE establishes downlink synchronization/uplink synchronization with the new target base station, which effectively reduces the delay caused by uplink/downlink synchronization in the cell reconfiguration/handover process and reduces the complexity of the UE.
  • the embodiment of the invention further provides a method for cell handover and reconfiguration, which is applied to a target base station in a cell handover and reconfiguration process.
  • 4 is a flow chart of the method. Referring to FIG. 4, the method includes: Step 401: Detect an uplink signal of the UE according to control of another base station other than the local area;
  • the macro base station controls the target base station to detect the uplink signal of the UE. If the original serving base station of the UE notifies the UE to perform cell measurement and selects a target base station for the UE according to the measurement result fed back by the UE, the original serving base station of the UE or the original serving base station of the UE is controlled by the same cluster. The base station controls the target base station to detect an uplink signal of the UE.
  • the channel sounding reference signal SRS
  • the uplink data channel PUSCH
  • the embodiment is not limited thereto.
  • Step 402 Acquire uplink timing information of the UE relative to the local device.
  • the uplink timing information of the UE relative to the local may be obtained by detecting an uplink signal of the UE.
  • Step 403 Calculate a local uplink timing advance according to the uplink timing information.
  • the target base station may use the downlink clock of the serving base station of the UE as a reference, and calculate a local uplink time advance according to the NTA value of the original serving base station reserved by the UE and the uplink timing information.
  • the target base station may also use the downlink clock of the local (that is, the target base station) as a reference, and calculate the local uplink timing advance according to the NTA value of the original serving base station reserved by the UE and the uplink timing information.
  • the downlink clock of the target base station may be reported to the target base station by the user, or may be obtained by the target base station.
  • the delay difference of the downlink signal may be calculated according to the received delay difference of the uplink signal, and then the delay difference is obtained. Downstream clock.
  • Step 404 Provide the uplink time advancement to the macro base station.
  • the target base station After the target base station obtains the uplink timing advance by detecting the uplink signal of the UE, the macro base station is informed by the interaction, so that the macro base station sends it to the UE. Based on this, the UE can determine the uplink transmission time for the target base station.
  • the method for the UE to determine the uplink transmission time of the target base station is described in detail in Embodiment 1, and details are not described herein again.
  • an appropriate mechanism may be used to prevent the UE from being able to distinguish whether the TA sent by the macro base station is applicable to the macro base station itself or the target base station. The specific mechanism is not limited herein.
  • the UE still maintains normal uplink and downlink communication with the original serving base station in the process of detecting the uplink signal of the UE by the target base station to determine the TA value.
  • the downlink synchronization between the UE and the target base station may perform downlink time synchronization on the target base station when the UE has not switched to the target base station. It is also possible to start downlink time synchronization of the target base station after the UE receives the reconfiguration information.
  • the target base station detects the uplink signal of the UE to obtain uplink synchronization between the UE and the target base station.
  • the macro base station instructs the UE to replace the originally configured serving base station with the new target base station by transmitting a handover command (RRC reconfiguration information of the target base station) to the UE, and transmits uplink synchronization information with the new target base station. Therefore, the UE establishes downlink synchronization/uplink synchronization with the new target base station, which effectively reduces the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process, and reduces the complexity of the UE.
  • the embodiment of the present invention further provides a method for cell handover and reconfiguration, which is applied to an original serving base station of a UE in a cell handover and reconfiguration process or a control base station in the same cluster as the original serving base station of the UE or Macro base station.
  • Figure 5 is a flow chart of the method. Referring to Figure 5, the method includes:
  • Step 501 The base station sends a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request.
  • the base station here may be a macro base station, as described in Embodiment 2; or may be the original service base station of the UE.
  • the macro base station or the original serving base station of the UE notifies the UE to perform cell measurement, so as to select a target base station for the UE according to the measurement result reported by the UE.
  • the measurement method of the UE has been described in detail in Embodiment 1, and details are not described herein again.
  • Step 502 After receiving the cell measurement result reported by the UE, the base station selects a target base station for the UE according to the measurement result of the cell, and controls the target base station to detect an uplink signal to obtain time advance information.
  • the base station is a serving base station or a macro base station of the UE or a control base station in the same cluster as the serving base station of the UE.
  • the base station obtains an uplink TA value by controlling the target base station to detect the uplink signal of the UE, so that the UE calculates its uplink transmission time for the target base station accordingly.
  • the method when the method is applied to a serving base station, the method may further include:
  • Step 503 The serving base station sends a handover command to the UE, so that the UE performs cell handover and reconfiguration according to the handover command.
  • the handover command may include information of the target base station TA to the UE determines an uplink transmission time in accordance with the TA information to the TA N target base station and the target base station is reserved.
  • the target base station is checked when the UE is still connected to the original serving base station.
  • the uplink signal of the UE is measured to obtain uplink synchronization between the UE and the target base station.
  • the macro base station instructs the UE to replace the originally configured serving base station with the new target base station by transmitting a handover command (RRC reconfiguration information of the target base station) to the UE, and transmits uplink synchronization information with the new target base station. Therefore, the UE establishes downlink synchronization/uplink synchronization with the new target base station, which effectively reduces the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process, and reduces the complexity of the UE.
  • Embodiment 1 - Embodiment 4 is an example of performing cell handover and reconfiguration in a UE in a wireless communication system, and the method for implementing the present invention is described from the perspectives of a UE, a macro base station, a target base station, and a serving base station, respectively.
  • the method of the embodiment of the invention is more clearly understood.
  • the method of the present embodiment will be described below through an information interaction diagram between the devices.
  • FIG. 6 is a schematic diagram of information interaction between each device (UE, macro base station, original serving base station, and target base station) in the cell handover and reconfiguration process.
  • the interaction process includes:
  • Step 601 The macro base station controls the UE to perform cell measurement.
  • the serving base station of the UE may also control the UE to perform cell measurement.
  • Step 602 The macro base station allocates an uplink resource to the UE, and the UE reports the measurement result to the macro base station by using the uplink resource.
  • the serving base station of the UE may allocate an uplink resource to the UE, and the UE reports the measurement result to the serving base station.
  • Step 603 The macro base station controls the target base station to detect an uplink signal of the UE.
  • the original serving base station of the UE or the control base station located in the same cluster as the original serving base station selects the target base station for the UE according to the foregoing measurement result
  • the original serving base station of the UE or the same cluster as the original serving base station of the UE is located in the same cluster.
  • the control base station controls the target base station to detect an uplink signal of the UE.
  • Step 604 The target base station detects an uplink signal of the UE, and calculates a TA value.
  • Step 605 The macro base station allocates a downlink resource to the UE, and sends a handover command (RRC reconfiguration information) to the UE on the allocated downlink resource.
  • RRC reconfiguration information a handover command
  • the serving base station of the UE may also allocate downlink resources to the UE and send the handover command to the UE.
  • Step 606 The macro base station sends a TAC (including the TA value of the target base station) to the UE.
  • the TA value in the TAC is the TA value of the target base station obtained by the macro base station by interacting with the target base station.
  • the TA value may also be transmitted through the handover command of step 605 or by the uplink resource allocation information of step 609.
  • Step 608 The macro base station allocates an uplink resource to the UE, so that the UE reports the RRC reconfiguration complete information to the macro base station by using the uplink resource.
  • the target base station may also allocate uplink resources to the UE, so that the UE reports to the target base station.
  • RRC reconfiguration complete information In this embodiment, the order of steps 606 and 608 is not limited.
  • downlink synchronization of the target base station may be performed when the UE has not switched to the target base station.
  • the downlink time synchronization of the target base station may also be started after the UE receives the reconfiguration information.
  • the interaction information between the base stations can be considered as No delay.
  • the embodiment of the present invention further provides a user equipment, as described in the following embodiment 5. Since the principle of the user equipment is the same as that of the first embodiment, the specific implementation may refer to the method of the first embodiment. Implementation, repetition will not be repeated.
  • FIG. 7 is a schematic diagram of the composition of the UE. Referring to FIG. 7, the UE includes:
  • a measuring unit 71 which performs cell measurement according to the cell measurement request and reports the measurement result
  • the processing unit 72 after receiving the handover command sent by the macro base station or the original serving base station, disconnects the original serving base station and retains the uplink time adjustment parameter NTA of the original serving base station ;
  • the configuration unit 73 performs cell handover and reconfiguration according to the handover command.
  • the UE may further include:
  • the reporting unit 74 when receiving the uplink resource allocation information sent by the macro base station or the target base station, feeds back the reconfiguration completion information to the macro base station or the target base station according to the uplink resource allocation information.
  • the UE may further include:
  • the determining unit 75 determines the uplink sending time according to the uplink time adjustment parameter and the TA information of the target base station when receiving the time advance command including the TA information of the target base station.
  • the uplink time advance command may pass the The handover command transmission may also be transmitted through the uplink resource allocation information, or may be transmitted through an existing MAC command. If the handover command sent by the original serving base station is received, the uplink time advance command is transmitted by using the handover command.
  • the determining unit 75 first determines the uplink sending time, and then feeds back the reconfiguration complete information to the target base station at the determined uplink sending time.
  • N TA — new N TA ⁇ . Ld +TA.
  • N TA —. Ld is the N TA value of the serving base station reserved by the UE, and TA is the TA value in the received TA information. More broadly, N TA —. Ld is the N TA value before the new TA command is received, and N TA — new is the N TA after the TA command is received. N TA value of ld .
  • the determining unit 75 may send, according to the downlink timing information of the target base station, an uplink signal by using the N TA — new sampling points as the uplink sending time, where the N TA — new is equal to the original serving base station reserved by the UE.
  • the N TA value is added to the TA value received by the UE last time.
  • the determining unit 75 may also use the downlink timing information of the original serving base station as a reference when receiving the first time advance command, and send the uplink signal by using the N TA ⁇ new sampling points as the uplink sending time in advance.
  • the N TA - new UE N TA equal value plus the value of the original serving base station TA reserved; upon receiving a first time other than the time advance command advance command to the target base station's downlink timing
  • the information is used as a reference, and the uplink signal is sent by using the N TA sample points as the uplink transmission time in advance, and the N TA — new is equal to N TA _.
  • the ld value is added to the received TA value.
  • the determining unit 75 may further use the downlink timing information of the target base station as a reference according to the measured downlink timing difference ⁇ , and advance the N TA — new + ⁇ t samples when receiving the first time advance command. point transmits an uplink signal as uplink transmission timing, when receiving a first time other than the time advance command advance command to advance the sampling points N TA _new as an uplink transmission time to send the uplink signal.
  • the UE in this embodiment replaces the originally configured serving base station with the new target base station according to the handover command of the macro base station or the original serving base station, and transmits the uplink synchronization information with the new target base station. Therefore, since the target base station detects the uplink signal of the UE and acquires the uplink synchronization between the UE and the target base station, the UE establishes downlink synchronization/uplink synchronization with the new target base station, which is effective. The delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a macro base station, as described in Embodiment 6 below. Since the principle of the macro base station solving the problem is the same as that of the second embodiment, the specific implementation may refer to the method of the second embodiment. Implementation, repetition will not be repeated.
  • Example 6 The embodiment of the invention provides a macro base station.
  • FIG. 8 is a schematic diagram of the structure of the macro base station. Referring to FIG. 8, the macro base station includes:
  • a determining unit 81 which is determined to be a target base station selected by the UE;
  • the sending unit 82 sends a handover command to the UE, so that the UE performs cell handover and reconfiguration according to the handover command.
  • the UE After receiving the handover command, the UE disconnects from the serving base station and retains the uplink time adjustment parameter N TA of the original serving base station.
  • the sending unit 82 further sends a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request.
  • the determining unit 81 selects a target base station for the UE according to the measurement result reported by the UE.
  • the determining unit 81 determines, according to the serving base station of the UE or the control base station that is located in the same cluster as the serving base station of the UE, the target base station selected by the UE, and determines that the UE is selected. Target base station.
  • the macro base station further includes:
  • the control unit 83 after determining the target base station of the UE by the determining unit 81, controls the target base station to detect the uplink signal to obtain uplink time advance information.
  • the sending unit 82 may further send uplink resource allocation information to the UE, so that the UE reports the reconfiguration complete information after the RRC reconfiguration is completed.
  • the sending unit 82 may further send a time advance command including the TA information of the target base station to the UE by using the foregoing handover command, so that the UE adjusts parameters according to the reserved uplink time and the target base station.
  • the time advance information determines the uplink transmission time.
  • the sending unit 82 may further send a time advance command including the TA information of the target base station to the UE by using the uplink resource allocation information, so that the UE adjusts parameters according to the reserved uplink time and the The time advance information of the target base station determines the uplink transmission time.
  • the sending unit 82 may further send a time advance command including the TA information of the target base station to the UE by using existing MAC signaling, so that the UE adjusts the parameter and the location according to the reserved uplink time.
  • the time advance information of the target base station determines the uplink transmission time.
  • the control target base station detects the uplink signal of the UE, acquires uplink synchronization between the UE and the target base station, and instructs the UE to configure the original uplink.
  • the serving base station is replaced with a new target base station and transmits its uplink synchronization information with the new target base station. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a target base station, as described in Embodiment 7 below. Since the principle of the target base station is the same as that of the third embodiment, the specific implementation may refer to the method of Embodiment 3. Implementation, repetition will not be repeated.
  • FIG. 9 is a schematic diagram of the composition of the base station.
  • the base station includes:
  • a detecting unit 91 which detects an uplink signal of the UE according to control of other base stations except the local area; and an obtaining unit 92, which acquires uplink timing information of the UE with respect to the local;
  • the calculating unit 93 calculates a local uplink timing advance amount according to the uplink timing information
  • Processing unit 94 which provides the uplink timing advance to the macro base station.
  • the calculating unit 93 may use the downlink clock of the serving base station of the UE as a reference, and calculate a local uplink time advance according to the NTA value of the serving base station reserved by the UE and the uplink timing information. the amount.
  • the calculating unit 93 may use a local downlink clock as a reference, and calculate a local uplink timing advance according to the NTA value of the serving base station reserved by the UE and the uplink timing information. In this embodiment, the calculating unit 93 may obtain a local downlink clock from the UE by using the acquiring unit 92, and may also determine a local downlink clock according to the received signal delay difference.
  • the target base station of the present embodiment when the UE is still connected to the original serving base station, detecting the uplink signal of the UE according to the control of the other base station, acquiring uplink synchronization between the UE and the target base station, and transmitting the same with the new target base station. Uplink synchronization information. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a base station, as described in Embodiment 8 below. Since the principle of solving the problem is the same as that of the method in Embodiment 4, the specific implementation may refer to the implementation of the method in Embodiment 4. The repetitions are not repeated here.
  • Example 8 The embodiment of the invention further provides a base station.
  • FIG. 10 is a schematic structural diagram of the base station. Referring to FIG. 10, the base station includes:
  • the sending unit 101 sends a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request.
  • the selecting unit 102 after receiving the cell measurement result reported by the UE, selecting a target base station for the UE according to the cell measurement result;
  • the control unit 103 controls the target base station to detect an uplink signal of the UE to obtain uplink time advance information.
  • the base station may be a serving base station of the UE, or may be a macro base station.
  • the embodiment of the invention further provides a control base station, which is in the same cluster as the original serving base station of the UE.
  • the control base station obtains the cell measurement result of the UE from the original serving base station or the macro base station of the UE, selects the target base station for the UE by using the selecting unit 102, and controls the target base station to detect the UE by the control unit 103.
  • the uplink signal obtains uplink time advance information.
  • the control target base station detects the uplink signal of the UE, acquires uplink synchronization between the UE and the target base station, and sends uplink synchronization with the new target base station. information. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a method for cell handover and reconfiguration.
  • the method of the embodiment of the present invention does not involve the macro base station, but is notified by the serving base station of the UE.
  • the serving base station of the UE selects a target base station for the UE according to the measurement result reported by the UE, and controls the target base station to detect an uplink signal of the UE to obtain an uplink TA value, and is served by the UE.
  • the base station sends a handover command (RRC reconfiguration information of the target base station) to the UE, and the target base station of the UE transmits uplink resource allocation information to the UE.
  • RRC reconfiguration information of the target base station RRC reconfiguration information of the target base station
  • the handover command or the uplink resource allocation information may include a TA value of the target base station, and the TA value of the target base station may also be transmitted through the existing MAC signaling.
  • the same contents as those in Embodiment 1 to Embodiment 4 will not be repeatedly described.
  • Figure 11 is a flow chart of the method, please refer to Figure 11, the method includes:
  • Step 1101 The user equipment (UE) performs cell measurement according to the cell measurement request sent by the serving base station. And report the measurement results;
  • Step 1102 After receiving the handover command (RRC reconfiguration information of the target base station) sent by the serving base station, the UE disconnects the serving base station and reserves the uplink time adjustment parameter NTA of the serving base station ; Step 1103: The UE performs cell handover and reconfiguration according to the handover command.
  • RRC reconfiguration information of the target base station RRC reconfiguration information of the target base station
  • the UE can use the existing means to perform cell switching and reconfiguration, and the embodiment of the present invention is not limited thereto.
  • the original serving base station provides a buffer buffered and transit packets to target eNB to the target base station, and sends a sequence number status (SN Status, Sequence Number Status) to the target base station (SN status). Transfer ), then transmit data to the target base station, and the target base station can receive the buffer packets from the source eNB.
  • the method further includes:
  • Step 1104 When receiving the time advance command including the uplink time advance information of the target base station, the UE determines the uplink sending time according to the uplink time adjustment parameter and the uplink time advance information of the target base station.
  • the method further includes:
  • Step 1105 After receiving the uplink resource allocation information sent by the target base station, after receiving the RRC reconfiguration, the UE feeds back the target base station according to the determined uplink transmission time according to the uplink resource allocation information. With completion information.
  • the time advance command may be transmitted by the serving base station by using the handover command, or may be transmitted by the target base station by using the uplink resource allocation information. If the TA command is transmitted through the uplink resource allocation information, the UE first receives the uplink resource allocation information, then determines the uplink transmission time, and finally feeds back the reconfiguration completion information to the target base station at the determined uplink transmission time.
  • N TA ⁇ . Ld is the NTA value of the serving base station reserved by the UE
  • TA is the TA value in the TA information of the received target base station.
  • N TA —. Ld is the N TA value before the new TA command is received
  • N TA — new is the N TA after the TA command is received.
  • N TA value of ld is the uplink transmission time.
  • the UE may use the downlink timing information of the target base station as a reference, and send an uplink signal by using the N TA new sampling points as an uplink transmission time, where the N TA — new is equal to the original serving base station reserved by the UE.
  • the UE may also use the reserved downlink timing information of the serving base station as a reference when receiving the first time advance command, in advance.
  • the N TA new sampling point transmits an uplink signal as an uplink transmission time, where the N TA — new is equal to the N TA value of the original serving base station reserved by the UE plus the TA value; and the receiving of the first time advance command
  • the time advance command is used, the downlink timing information of the target base station is used as a reference, and the uplink signal is sent as the uplink transmission time in advance by the N TA — new sampling points, where the N TA — new is equal to N TA _.
  • the ld value is added to the received TA value.
  • the UE may further use the downlink timing information of the target base station as a reference according to the measured downlink timing difference ⁇ , and advance the N TA — new + A t sampling points when receiving the first time advance command.
  • the uplink transmission time when the time advance command other than the first time advance command is received, the uplink signal is transmitted as the uplink transmission time in advance by the N TA — ⁇ sampling points.
  • Embodiment 1 the same as Embodiment 1, the execution order of each step is not limited, and in actual implementation, it is determined according to actual conditions.
  • the serving base station selects the uplink signal for the target base station to determine the uplink time advancement amount of the UE and the target base station, and the UE re
  • the originally configured serving base station is replaced with a new target base station according to a handover command of its serving base station. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/switching process is effectively reduced, and the complexity of the UE is reduced.
  • FIG. 12 is a flow chart of the method. Referring to Figure 12, the method includes:
  • Step 1201 The serving base station sends a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request.
  • Step 1202 After receiving the cell measurement result reported by the UE, the serving base station selects a target base station for the UE according to the cell measurement result.
  • Step 1203 The serving base station controls the target base station to detect an uplink signal to obtain time advance information.
  • the method further includes:
  • Step 1204 The serving base station sends a handover command to the UE, so that the UE performs cell handover and reconfiguration according to the handover command.
  • the UE After receiving the handover command, the UE disconnects from the serving base station and reserves the uplink time adjustment parameter ⁇ ⁇ of the serving base station.
  • the switching command may include a time advance command, and the time advance command includes The uplink time advance information (TA value) of the target base station, so that the UE determines the uplink sending time according to the reserved uplink time adjustment parameter N TA and the uplink time advance information (TA value) of the target base station.
  • TA value The uplink time advance information of the target base station
  • the serving base station controls the target base station selected by the UE to detect the uplink signal of the UE to determine an uplink time advance of the UE and the target base station.
  • the serving base station of the UE instructs the UE to replace the originally configured serving base station with a new target base station. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • FIG. 13 is a flow chart of the method, please refer to Figure 13, the method includes:
  • Step 1301 The target base station detects an uplink signal of the UE according to the control of the serving base station of the UE.
  • Step 1302 The target base station acquires uplink timing information of the UE relative to the local.
  • Step 1303 The target base station calculates a local uplink time advance according to the uplink timing information.
  • the target base station may use the downlink clock of the serving base station of the UE as a reference, and calculate a local uplink time advance according to the NTA value of the serving base station reserved by the UE and the uplink timing information in step 1303.
  • the target base station may also use the local downlink clock as a reference, and calculate a local uplink timing advance according to the NTA value of the serving base station reserved by the UE and the uplink timing information.
  • the local downlink clock may be obtained by the target base station from the UE, or may be determined by the target base station according to the received signal delay difference. As described in Embodiment 3, details are not described herein again.
  • the method further includes:
  • Step 1305 The target base station sends uplink resource allocation information to the UE, so that the UE feeds back the reconfiguration completion information according to the uplink resource allocation information.
  • the uplink resource allocation information may include a time advance command, where the time advance command includes uplink time advance information of the target base station, so that the UE adjusts parameters according to the reserved uplink time and the The uplink time advance information of the target base station determines the uplink transmission time.
  • the target base station selected by the serving base station starts detecting the uplink signal to determine the uplink time advance of the UE and the target base station.
  • the UE then replaces the originally configured serving base station with the new target base station according to the indication of its serving base station. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • Embodiment 9 - Embodiment 11 is an example of performing cell handover and reconfiguration by a UE in a wireless communication system, and the method of the embodiment of the present invention is explained from the perspectives of a UE, a serving base station, and a target base station, respectively, in order to implement the present invention.
  • the method of the example is more clear and easy to understand.
  • the method of the present embodiment will be described below through an information interaction diagram between the devices.
  • FIG. 14 is a schematic diagram of information interaction between each device (UE, serving base station, and target base station) in a cell handover and reconfiguration process.
  • the interaction process includes:
  • Step 1401 The original serving base station of the UE controls the UE to perform cell measurement.
  • Step 1402 The original serving base station allocates an uplink resource to the UE, so that the UE reports the measurement result to the serving base station by using the uplink resource.
  • Step 1403 The original serving base station of the UE controls the target base station to detect the uplink signal of the UE.
  • the control base station that is located in the same cluster as the original serving base station of the UE controls the target base station to detect the uplink signal of the UE.
  • Step 1404 The target base station detects an uplink signal of the UE, and calculates a TA value.
  • Step 1405 The original serving base station of the UE allocates downlink resources to the UE, and sends RRC reconfiguration information to the UE on the allocated downlink resources.
  • the original serving base station of the UE may simultaneously send TA information to the UE by using the same signaling.
  • Step 1406 UE is disconnected from the original serving base station and synchronize to the target base station, while retaining the N TA original serving base station to determine an uplink transmission time.
  • Step 1407 The target base station allocates an uplink resource to the UE, so that the UE reports the RRC reconfiguration completion information to the target base station according to the use of the uplink resource.
  • the target base station may also send TA information to the UE by using the same signaling.
  • the backhaul delay of the small base station (the original serving base station and the target base station) and the macro base station is large, for example, the original serving base station.
  • the target base station is connected to the same eNB, and the macro base station is connected to another eNB. It can be considered that the interaction information between the small base stations is without delay, and the interaction information between the small base station and the macro station is delayed.
  • An embodiment of the present invention further provides a user equipment, as described in Embodiment 12 below, because the user equipment
  • the principle of the solution is similar to that of the embodiment 9. Therefore, the specific implementation can refer to the implementation of the method of the embodiment 9, and the repeated description is not repeated.
  • FIG. 15 is a schematic diagram of the composition of the UE.
  • the UE includes:
  • the measuring unit 151 performs cell measurement according to the cell measurement request of the serving base station and reports the measurement result.
  • the processing unit 152 disconnects the connection with the serving base station and retains the uplink time of the serving base station after receiving the handover command sent by the serving base station. Adjust the parameter N TA;
  • the configuration unit 153 performs cell handover and reconfiguration according to the handover command.
  • the UE further includes:
  • the determining unit 154 determines the uplink sending time according to the uplink time adjustment parameter and the uplink time advance information of the target base station when receiving the time advance command including the uplink time advance information of the target base station.
  • the UE further includes:
  • the reporting unit 155 when receiving the uplink resource allocation information sent by the target base station, feeds back the reconfiguration completion information to the target base station after completing the RRC reconfiguration.
  • the uplink time advance information may be transmitted by using the handover command, or may be transmitted by using the uplink resource allocation information. If the TA command is transmitted through the uplink resource allocation information, the UE first receives the uplink resource allocation information, then determines the uplink transmission time, and finally feeds back the reconfiguration completion information to the target base station at the determined uplink transmission time.
  • N TA —. Ld is the NTA value of the serving base station reserved by the UE
  • TA is the TA value in the TA information of the received target base station. More broadly, N TA —. Ld is the N TA value before the new TA command is received, and N TA — new is the N TA after the TA command is received. N TA value of ld .
  • the UE may use the downlink timing information of the target base station as a reference, and send an uplink signal by using the N TA new sampling points as an uplink transmission time, where the N TA — new is equal to the original serving base station reserved by the UE.
  • the UE may also use the reserved downlink timing information of the serving base station as a reference, and send the uplink signal by using the N TA new sampling points as the uplink sending time in advance.
  • N TA — new is equal to the N TA value of the original serving base station reserved by the UE plus the TA value; when receiving the time advance command other than the first time advance command, using the downlink timing information of the target base station as a reference , in advance of the N TA — new sampling points
  • the uplink transmission time sends an uplink signal, and the N TA — new is equal to N TA _.
  • the ld value is added to the received TA value.
  • the UE may further use the downlink timing information of the target base station as a reference according to the measured downlink timing difference ⁇ , and advance the N TA — new + A t sampling points when receiving the first time advance command.
  • the uplink signal is transmitted as the uplink transmission time in advance by the N TA — ⁇ sampling points.
  • the serving base station when the UE is still in the connection state with the serving base station, the serving base station starts detecting the uplink signal for the target base station selected by the serving base station to determine the uplink time advance of the UE and the target base station, and the UE The original configured serving base station is replaced with a new target base station according to the handover command of its serving base station. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/switching process is effectively reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a service base station.
  • a service base station As described in the following Embodiment 13, the principle of solving the problem is similar to the method of Embodiment 10. Therefore, the specific implementation may refer to the method of Embodiment 10. Implementation, repetition will not be repeated.
  • the embodiment of the invention further provides a base station.
  • 16 is a schematic diagram of the structure of the base station. Referring to FIG. 16, the base station includes:
  • the sending unit 161 is configured to send a cell measurement request to the UE, so that the UE performs cell measurement and reports according to the cell measurement request.
  • the selecting unit 162 after receiving the cell measurement result reported by the UE, selecting a target base station for the UE according to the cell measurement result;
  • the control unit 163 controls the target base station to detect an uplink signal to obtain time advance information.
  • the sending unit 161 is further configured to send a handover command to the UE, so that the UE performs cell handover and reconfiguration according to the handover command.
  • the UE After receiving the handover command, the UE disconnects from the serving base station and reserves the uplink time adjustment parameter N TA of the serving base station.
  • the handover command includes a time advance command, where the time advance command includes uplink time advance information of the target base station, so that the UE adjusts parameters according to the reserved uplink time and the target base station.
  • the uplink time advance information determines the uplink transmission time.
  • the serving base station controls The target base station selected by the UE detects an uplink signal of the UE to determine an uplink timing advance of the UE and the target base station, and the serving base station of the UE instructs the UE to replace the originally configured serving base station with a new target base station. . Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a target base station, as described in Embodiment 14 below. Since the principle of solving the problem is similar to the method of Embodiment 11, the specific implementation may refer to the method of Embodiment 11. Implementation, repetition will not be repeated.
  • the embodiment of the invention further provides a base station.
  • 17 is a schematic structural diagram of the base station. Referring to FIG. 17, the base station includes:
  • a detecting unit 171 which detects an uplink signal of the UE according to a control of a serving base station of the UE, and an acquiring unit 172, which acquires uplink timing information of the UE with respect to the local;
  • the calculating unit 173 calculates a local uplink timing advance according to the uplink timing information; and the processing unit 174 provides the uplink timing advance to the serving base station of the UE.
  • the calculating unit 173 may use the downlink clock of the serving base station of the UE as a reference, and calculate a local uplink time advance according to the NTA value of the serving base station reserved by the UE and the uplink timing information. the amount.
  • the calculating unit 173 may use a local downlink clock as a reference, and calculate a local uplink timing advance according to the NTA value of the serving base station reserved by the UE and the uplink timing information. In this embodiment, the calculating unit 173 may obtain a local downlink clock from the UE by using the acquiring unit 172, and may also determine a local downlink clock according to the received signal delay difference.
  • the base station further includes:
  • the sending unit 175 sends uplink resource allocation information to the UE, so that the UE feeds back the reconfiguration completion information according to the uplink resource allocation information.
  • the uplink resource allocation information may include a time advance command, where the time advance command includes uplink time advance information of the target base station, so that the UE adjusts parameters according to the reserved uplink time and the The uplink time advance information of the target base station determines the uplink transmission time.
  • the target base station selected by the serving base station starts detecting the uplink signal to determine the uplink time advance of the UE and the target base station.
  • the UE then replaces the originally configured serving base station with the new target base station according to the indication of its serving base station. Therefore, since the UE establishes downlink synchronization/uplink synchronization with the new target base station, the delay caused by the uplink/downlink synchronization in the cell reconfiguration/handover process is effectively reduced, and the complexity of the UE is reduced.
  • the embodiment of the present invention further provides a communication system, where the communication system includes the UE described in Embodiment 5 and the macro base station described in Embodiment 6, and the target base station described in Embodiment 7 and Embodiment 8 Service base station.
  • the embodiment of the present invention further provides a communication system, where the communication system includes the UE described in Embodiment 12, and the serving base station described in Embodiment 13, and the target base station described in Embodiment 14.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes the computer to perform the cell handover and the weights described in Embodiments 2-4, 10-11 in the base station. Matching method.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to perform the cell switching and reconfiguration method described in Embodiments 2-4, 10-11 in the base station. .
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a terminal device, the program causes the computer to perform the cell switching and reconfiguration according to Embodiments 1 and 9 in the terminal device. method.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to perform the method of cell switching and reconfiguration described in Embodiments 1 and 9 in the terminal device.
  • the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

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Abstract

本发明实施例提供了一种小区切换和重配的方法和装置,所述方法包括:用户设备(UE)根据小区测量请求进行小区测量并上报测量结果;所述UE在接收到切换命令后,断开与服务基站的连接并保留服务基站的上行时间调整参数NTA;所述UE根据所述切换命令,进行小区切换和重配。通过本实施例的方法和装置,在UE还处于与服务基站的连接状态时,目标基站就开始检测其上行信号以确定该UE与该目标基站的上行时间提前量,UE再根据其他基站的指示将原配置的服务基站替换为新的目标基站。由此,由于使得UE与新的目标基站建立下行同步/上行同步,有效减少了小区重配/切换过程中由于上/下行同步导致的时延,降低了UE的复杂度。

Description

小区切换与重配的方法和装置 技术领域
本发明涉及无线通信技术领域, 尤其涉及一种小区切换与重配的方法和装置。 背景技术
随着智能终端的大幅增加, 在未来的 LTE-Advanced ( Long Term Evolution-Advanced, 增强的长期演进)系统的进一步演进中, 传统的宏基站(Macro Cell) 可能无法应付如此迅猛增长的容量及峰值速率需求。 通过进一步更密集的布置 基站, 使得用户在物理位置上更接近基站, 可以提高系统容量, 提高峰值速率并改善 用户终端体验。 但大功率的宏基站的部署, 会导致如成本过高、 非绿色通信等问题。 因此,人们开始考虑采用低功率的小基站(Small Cell),例如 Pico cell (微基站), Femto cell (毫微微蜂窝基站) 以及 RRH (Remote Radio Head, 远端无线头)。 相比宏站, 小基站具有低成本、部署快速灵活、性价比高的综合优势, 因此小基站很适于用于室 外热点, 增加网络容量, 改善室内深度覆盖, 提升用户感知。 因此, 小基站将越来越 受到业界的关注。在未来的 LTE-Advanced网络中,小基站的数量将超过传统的宏站。
小基站覆盖范围相对宏基站较小, 可以利用更高的可用频段, 例如 3.5GHz, 而 宏基站则继续沿用现有相对较低的频段以提供较大并相对鲁棒的覆盖。对于可以支持 多载波聚合 (CA, Carrier Aggregation) 的用户 (UE, User Equipment), 可以为该用 户同时配置宏基站与小基站,两种基站工作在不同的频点上,即不同的载波分量(CC, Carrier Component) 0 小基站可以处于宏基站的覆盖范围内, 也可以处于宏基站覆盖 范围外。 小基站的部署可以是稀疏的, 也可以是密集的。 小基站可以以簇 (cluster) 的形式出现, 即将在地理位置上相对接近的各个小基站划分为一个簇。 在同一簇内, 各个小基站可与同一个 eNB (evolved Node B, 演进型基站) 相连。 那么, 簇内各个 小基站间的回程 (backhaul) 可认为是较为理想的, 例如时延小, 传输能力强。 而在 宏基站覆盖范围内的不同簇可连接到不同的 eNB上或者也连接于同一个 eNB上。 图 1 是小基站与宏基站联合部署的示意图, 如图 1所示, F2用于部署小基站, F1用于 部署宏基站。
发明人在实现本发明的过程中发现, 当用户在同一簇内的各个小基站间移动时, 若依然采用传统的小区切换流程,用户将处于频繁切换状态中,增加了用户侧的负担, 且用户与基站以及基站与基站之间交互了大量不必要的信息。
应该注意, 上面对技术背景的介绍只是为了方便对本发明的技术方案进行清楚、 完整的说明, 并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本发 明的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。 发明内容
本发明实施例的目的在于提供一种小区切换与重配的方法和装置,以支持用户在 小基站间的频繁切换, 简化切换流程。
根据本发明实施例的第一方面, 提供了一种小区切换与重配的方法, 其中, 所述 方法包括:
用户设备 (UE ) 根据小区测量请求进行小区测量并上报测量结果;
所述 UE在接收到宏基站或者所述 UE的服务基站发送的切换命令时, 断开与服 务基站的连接并保留服务基站的上行时间调整参数 NTA;
所述 UE根据所述切换命令, 进行小区切换与重配。
根据本发明实施例的第二方面, 提供了一种小区切换与重配的方法, 其中, 所述 方法包括:
宏基站确定为 UE选择的目标基站;
所述宏基站向所述 UE发送切换命令, 以便所述 UE根据所述切换命令进行小区 切换和重配;
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
根据本发明实施例的第三方面, 提供了一种小区切换与重配的方法, 其中, 所述 方法包括:
根据除本地以外的其他基站的控制检测 UE的上行信号;
获取所述 UE相对于本地的上行定时信息;
根据所述上行定时信息计算本地的上行时间提前量;
将所述上行时间提前量提供给宏基站。
根据本发明实施例的第四方面, 提供了一种小区切换与重配的方法, 其中, 所述 方法包括:
基站向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行小区测量并 上报;
所述基站在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果为所 述 UE选择目标基站;
控制所述目标基站检测所述 UE 的上行信号以获得目标基站的上行时间提前信 息。
根据本发明实施例的第五方面, 提供了一种用户设备 (UE), 其中, 所述 UE包 括:
测量单元, 其根据小区测量请求进行小区测量并上报测量结果;
处理单元, 其在接收到宏基站或者所述 UE的服务基站发送的切换命令时, 断开 与服务基站的连接并保留服务基站的上行时间调整参数 NTA;
配置单元, 其根据所述切换命令, 进行小区切换和重配。
根据本发明实施例的第六方面, 提供了一种宏基站, 其中, 所述宏基站包括: 确定单元, 其确定为 UE选择的目标基站;
发送单元, 其向所述 UE发送切换命令, 以便所述 UE根据所述切换命令进行小 区切换和重配;
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
根据本发明实施例的第七方面, 提供了一种基站, 其中, 所述基站包括: 检测单元, 其根据除本地以外的其他基站的控制检测 UE的上行信号; 获取单元, 其获取所述 UE相对于本地的上行定时信息;
计算单元, 其根据所述上行定时信息计算本地的上行时间提前量;
处理单元, 其将所述上行时间提前量提供给宏基站。
根据本发明实施例的第八方面, 提供了一种基站, 其中, 所述基站包括: 发送单元, 其向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行小 区测量并上报;
选择单元, 其在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果 为所述 UE选择目标基站; 控制单元, 其控制所述目标基站检测上行信号以获得目标基站的上行时间提前信 息。
根据本发明实施例的第九方面, 提供了一种小区切换与重配的方法, 其中, 所述 方法包括:
用户设备 (UE) 根据服务基站的小区测量请求进行小区测量并上报测量结果; 所述 UE在接收到服务基站发送的切换命令后, 断开与服务基站的连接并保留服 务基站的上行时间调整参数 NTA;
所述 UE根据所述切换命令, 进行小区切换和重配。
根据本发明实施例的第十方面, 提供了一种小区切换与重配的方法, 其中, 所述 方法包括:
向 UE发送小区测量请求,以便 UE根据所述小区测量请求进行小区测量并上报; 在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果为所述 UE选 择目标基站;
控制所述目标基站检测上行信号以获得目标基站的上行时间提前信息; 向所述 UE发送切换命令,以便所述 UE根据所述切换命令进行小区切换和重配; 其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
根据本发明实施例的第十一方面, 提供了一种小区切换与重配的方法, 其中, 所 述方法包括:
根据 UE的服务基站的控制检测所述 UE的上行信号;
获取所述 UE相对于本地的上行定时信息;
根据所述上行定时信息计算本地的上行时间提前量;
将包含所述上行时间提前量的上行时间提前信息提供给所述 UE的服务基站。 根据本发明实施例的第十二方面, 提供了一种用户设备 (UE), 其中, 所述 UE 包括:
测量单元, 其根据服务基站的小区测量请求进行小区测量并上报测量结果; 处理单元, 其在接收到服务基站发送的切换命令后, 断开与服务基站的连接并保 留服务基站的上行时间调整参数 NTA;
配置单元, 其根据所述切换命令, 进行小区切换和重配。 根据本发明实施例的第十三方面, 提供了一种基站, 其中, 所述基站包括: 发送单元, 其向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行小 区测量并上报;
选择单元, 其在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果 为所述 UE选择目标基站;
控制单元, 其控制所述目标基站检测上行信号以获得目标基站的时间提前信息; 其中, 所述发送单元还用于向所述 UE发送切换命令, 以便所述 UE根据所述切换命 令进行小区切换和重配;
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
根据本发明实施例的第十四方面, 提供了一种基站, 其中, 所述基站包括: 检测单元, 其根据 UE的服务基站的控制检测所述 UE的上行信号;
获取单元, 其获取所述 UE相对于本地的上行定时信息;
计算单元, 其根据所述上行定时信息计算本地的上行时间提前量;
处理单元, 其将所述上行时间提前量提供给所述 UE的服务基站。
根据本发明实施例的第十五方面, 提供了一种通信系统, 其中, 所述通信系统包 括权利要求第五方面所述的 UE, 以及第六方面所述的宏基站, 以及权第七方面所述 的目标基站, 以及第八方面所述的服务基站。
根据本发明实施例的第十六方面, 提供了一种通信系统, 其中, 所述通信系统包 括第十二方面所述的 UE以及第十三方面所述的服务基站, 以及第十四方面所述的目 标基站。
根据本发明实施例的其他方面,还提供了一种计算机可读程序,其中当在基站中 执行该程序时,该程序使得计算机在所述基站中执行前述在基站中执行的小区切换与 重配的方法。
根据本发明实施例的其他方面, 还提供了一种存储有计算机可读程序的存储介 质,其中该计算机可读程序使得计算机在基站中执行前述在基站中执行的小区切换与 重配的方法。
根据本发明实施例的其他方面,还提供了一种计算机可读程序,其中当在终端设 备中执行该程序时,该程序使得计算机在所述终端设备中执行前述在 UE中执行的的 小区切换与重配的方法。
根据本发明实施例的其他方面, 还提供了一种存储有计算机可读程序的存储介 质,其中该计算机可读程序使得计算机在终端设备中执行前述在 UE中执行的小区切 换与重配的方法。
本发明实施例的有益效果在于: 通过本发明实施例的方法和装置,有效减少了小 区重配和切换过程中由于上下行同步导致的时延, 降低了用户的复杂度。
参照后文的说明和附图,详细公开了本发明的特定实施方式, 指明了本发明的原 理可以被采用的方式。应该理解, 本发明的实施方式在范围上并不因而受到限制。在 所附权利要求的精神和条款的范围内,本发明的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和 /或示出的特征可以以相同或类似的方式在一个或更多 个其它实施方式中使用, 与其它实施方式中的特征相组合, 或替代其它实施方式中的 特征。
应该强调, 术语"包括 /包含"在本文使用时指特征、 整件、 步骤或组件的存在, 但并不排除一个或更多个其它特征、 整件、 步骤或组件的存在或附加。 附图说明
参照以下的附图可以更好地理解本发明的很多方面。附图中的部件不是成比例绘 制的, 而只是为了示出本发明的原理。 为了便于示出和描述本发明的一些部分, 附图 中对应部分可能被放大或缩小。在本发明的一个附图或一种实施方式中描述的元素和 特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外,在 附图中, 类似的标号表示几个附图中对应的部件, 并可用于指示多于一种实施方式中 使用的对应部件。 在附图中:
图 1是小基站与宏基站联合部署的示意图;
图 2是本发明实施例 1的小区切换与重配的方法流程图;
图 2A-图 2D是图 2所示的实施例的四种实施方式;
图 3是本发明实施例 2的小区切换与重配的方法流程图;
图 4是本发明实施例 3的小区切换与重配的方法流程图;
图 5是本发明实施例 4的小区切换与重配的方法流程图;
图 6是实施例 1-4涉及的各装置的信息交互示意图; 图 7是本发明实施例 5的用户设备的组成示意图;
图 8是本发明实施例 6的宏基站的组成示意图;
图 9是本发明实施例 7的目标基站的组成示意图;
图 10是本发明实施例 8的服务基站的组成示意图;
图 11是本发明实施例 9的小区切换与重配的方法流程图;
图 12是本发明实施例 10的小区切换与重配的方法流程图;
图 13是本发明实施例 11的小区切换与重配的方法流程图;
图 14是实施例 9-11涉及的各装置的信息交互示意图;
图 15是本发明实施例 12的 UE的组成示意图;
图 16是本发明实施例 13的服务基站的组成示意图;
图 17是本发明实施例 14的目标基站的组成示意图。 具体实施方式
参照附图, 通过下面的说明书, 本发明实施例的前述以及其它特征将变得明显。 这些实施方式只是示例性的, 不是对本发明的限制。为了使本领域的技术人员能够容 易地理解本发明的原理和实施方式,本发明的实施方式以无线通信系统中的小区切换 与重配为例进行说明, 但可以理解, 本发明实施例并不限于上述系统, 对于涉及小区 切换和重配的其他系统均适用。
实施例 1
本发明实施例提供了一种小区切换与重配的方法,该方法应用于用户设备(UE)。 图 2是该方法的流程图, 请参照图 2, 该方法包括:
步骤 201 : 用户设备 (UE) 根据小区测量请求进行小区测量并上报测量结果; 其中, 该小区测量请求可能是宏基站发送的, 也可能是正在为该 UE服务的小基 站(简称服务基站)发送的, 该宏基站或该服务基站根据业务需求通知 UE进行小区 其中, 该 UE基于上述基站的小区测量请求, 对本小区及相邻小区进行测量, 例 如测量载波接收机信号强度指示 (Carrier RSSI), RSRP (Reference Signal Receiving Power, 参考信号接收功率)、 禾口 /或 RSRQ (Reference Signal Receiving Quality, 参考 信号接收质量) 等。 其中, 该宏基站或服务基站也会为该 UE分配上行资源, 以便 UE上报测量结果。 这可以通过现有手段来实现, 在此不再赘述。
其中, 该 UE可采用与现有小区切换相同的测量方式, 或与现有载波聚合 (CA) 中载波分量重配相同的测量方式, 或简化的测量方式。本发明实施例并不以此作为限 制。
步骤 202: 所述 UE在接收到宏基站或者服务基站发送的切换命令后, 断开与服 务基站的连接并保留原服务基站的上行时间调整参数 NTA;
其中, 该切换命令可以在已有的 RRC (Radio Resource Control, 无线资源控制) 配置、 重配信令中实现, 也可以通过预先定义的 RRC配置、 重配信令来实现。 当通 过预先定义的 RRC配置、 重配信令来实现时, 可以与传统的载波聚合(CA) 中载波 分量重配时所用的 RRC配置、 重配信令相同, 或进一步简化, 或修改某些参数。 例 如可以不用包括目标小基站的 PCI (物理小区 ID), 而包括虚拟小区 ID (假设一簇内 的各个小基站采用相同的 PCI, 但采用不同的虚拟小区 ID)。
其中, UE断开与服务基站的连接是指释放服务基站的参数。 在本实施例中, UE 为了确定上行发送时间, 需保留原服务基站的上行时间调整参数 NTA。 其中, UE还 可以保留服务基站的下行定时信息, 也可以不保留。
在本实施例中, 服务基站是指当前为 UE提供服务的小基站(small cell), 而不是 指宏基站。
步骤 203: 所述 UE根据所述切换命令, 进行小区切换和重配。
其中, UE 可以采用现有手段进行小区切换和重配, 本发明实施例并不以此作为 限制。并且,在切换过程中,原服务基站会向目标基站提供缓冲和中转数据包(deliver buffered and transit packets to target eNB),并将序号状态 ( SN Status, Sequence Number Status ) 发送给目标基站 ( SN status transfer ), 然后向目标基站传输数据 ( data forwarding ) , 目标基站可以从原服务基站收到该缓冲数据包 (buffer packets from source eNB )。
其中, 关于 UE与目标基站的下行同步, 可以在 UE尚未切换至目标基站时就对 目标基站进行下行时间同步。 也可以在 UE接收到重配信息后, 开始对目标基站进行 下行时间同步。 本实施例并不以此作为限制。
在一个实施例中, UE 在重配完成后需要上报重配完成信息, 以进入正常数据传 输阶段。 因此, 在该实施例中, 本实施例的方法还包括:
步骤 204: 所述 UE在接收到宏基站或者目标基站发送的上行资源分配信息后, 根据所述上行资源分配信息向所述宏基站或者所述目标基站反馈重配完成信息。
其中, 如果该上行资源分配信息是宏基站发送的, 则 UE在重配完成后直接向该 宏基站反馈重配完成信息; 如果该上行资源分配信息是目标基站发送的, 则 UE在重 配完成后向该目标基站反馈该重配完成信息。
在一个实施例中, 为了向目标基站发送上行数据, 例如向目标基站反馈重配完成 信息, UE还要确定上行发送时间。 因此, 在该实施例中, 本实施例的方法还包括: 步骤 205: 所述 UE在接收到包含目标基站的上行时间提前信息的时间提前命令 时, 根据保留的服务基站的 NTA值以及所述 TA命令中的 TA信息, 确定上行发送时 间。
其中,如果上述切换命令由宏基站发送,则所述 ΤΑ命令可以通过步骤 202的 RRC 重配信息来传送, 例如在原有无线资源控制重配信令中新增 ΤΑ命令字段; 也可以通 过步骤 204的上行资源分配信息来传送, 例如通过随机接入响应(RAR)来传送; 还 可以通过现有的 MAC信令(称为预定的 MAC信令)来传送, 也即重用现有的 MAC 信令。如果上述切换命令由所述 UE的原服务基站发送,则所述 TA命令通过步骤 202 的 RRC重配信息来传送。
其中, 所述目标基站通过检测 UE的上行信号可以通过计算获得所述目标基站的 TA值。 该目标基站通过与宏基站的交互可以使得宏基站获知该 TA值。 同样的, 该 目标基站通过与该 UE的原服务基站的交互可以使得该 UE的原服务基站获知该 TA 值。 对于具体的交互方法, 本实施例并不加以限制。
其中, 上行发送时间 NTAnew=NTA—。ld+TA。 在这里, 其中 NTA—。ld 为 UE保留的服 务基站的 NTA值, TA为接收到的目标基站的 TA信息中的 TA值。 更广义的, NTA―。 ld 为在收到新的 TA命令前的 NTA值, NTAnew为收到 TA命令后更新 NTA—。ld的 NTA值。
其中, UE确定上行发送时间可以有以下至少三种方式。
在第一种方式中, 所述 UE可以以所述目标基站的下行定时信息作为参考, 以提 前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留 的原服务基站的 NTA值加上 UE最近一次接收到的 TA值。
在第二种方式中,所述 UE也可以在接收到如步骤 206中所述的上行 TA命令(称 为第一个时间提前命令) 时, 以原服务基站的下行定时信息作为参考, 以提前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留的原服 务基站的 NTA值加上所述 ΤΑ值, 而在接收到后续的 ΤΑ命令 (除第一个时间提前命 令以外的时间提前命令)时, 以所述目标基站的下行定时信息作为参考, 以提前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 NTA_。ld值加上所 收到的 TA值。
在第三种方式中, 如果根据目标基站的下行定时信息作为参考, 且基站侧计算的 TA值并未考虑目标基站与原服务基站的下行定时差时, 则所述 UE还可以根据测量 得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参考, 在接收到第一个 时间提前命令时, 以提前 NTA new+ A t个抽样点作为上行发送时间发送上行信号, 在 接收到后续的 TA命令 (除第一个时间提前命令以外的时间提前命令) 时, 以提前
NTA_new个抽样点作为上行发送时间发送上行信号。
在本实施例中, 并不限制各步骤的执行顺序, 例如时间提前命令可以在上行资源 分配信息之前, 也可以在上行资源分配信息之中,还可以在上行资源分配信息之后而 在反馈重配完成信息之前, 具体实施时, 可以根据实际情况确定。
根据各步骤不同的执行顺序, 图 2所示的方法可以有图 2A-图 2D四种实施方式。 在一个实施方式中, 如图 2A所示, 本实施例的方法的各步骤可以是以下顺序: 步骤 201a: UE根据小区测量请求进行小区测量并上报测量结果;
步骤 202a: 所述 UE在接收到宏基站发送的切换命令后, 断开与服务基站的连接 并保留原服务基站的上行时间调整参数 NTA, 并根据所述切换命令, 进行小区切换和 重配;
步骤 203a: 所述 UE在接收到宏基站发送的上行资源分配信息后, 在重配完成后 向所述宏基站反馈重配完成信息;
步骤 204a: 所述 UE在向所述目标基站发送上行数据之前, 根据保留的原服务基 站的 NTA值以及接收到的包含目标基站的 ΤΑ信息的 ΤΑ命令, 确定上行发送时间。
其中,所述包含目标基站的 ΤΑ信息的 ΤΑ命令可以通过步骤 202a的切换命令传 送, 或者通过步骤 204a的上行资源分配信息传输, 或者在步骤 204a之前通过一个 MAC信令传送。
在一个实施方式中, 如图 2B所示, 本实施例的方法的各步骤也可以是以下顺序: 步骤 201b: UE根据小区测量请求进行小区测量并上报测量结果; 步骤 202b: 所述 UE在接收到宏基站发送的切换命令后, 断开与服务基站的连接 并保留原服务基站的上行时间调整参数 NTA, 并根据所述切换命令, 进行小区切换和 重配;
步骤 203b: 所述 UE在接收到包含目标基站的 TA信息的 TA命令后, 根据保留 的原服务基站的 NTA值以及所述目标基站的 ΤΑ信息, 确定上行发送时间;
步骤 204b: 所述 UE在接收到目标基站发送的上行资源分配信息后, 在重配完成 后, 在所确定的上行发送时间向所述目标基站反馈重配完成信息。
其中,所述包含目标基站的 TA信息的 TA命令可以通过步骤 202b的切换命令传 送, 或者通过步骤 204b的上行资源分配信息传送(在这种情况下, UE先接收包含该 TA命令的上行资源分配信息, 再确定上行发送时间), 或者在步骤 203b之前通过一 个 MAC信令传送。
在一个实施方式中, 如图 2C所示, 本实施例的方法的各步骤还可以是以下顺序: 步骤 201c: UE根据小区测量请求进行小区测量并上报测量结果;
步骤 202c: 所述 UE在接收到服务基站发送的切换命令后, 断开与服务基站的连 接并保留原服务基站的上行时间调整参数 NTA, 并根据所述切换命令, 进行小区切换 和重配;
步骤 203c: 所述 UE在接收到宏基站发送的上行资源分配信息后, 在重配完成后 向所述宏基站反馈重配完成信息;
步骤 204c: 所述 UE在向所述目标基站发送上行数据之前, 根据保留的原服务基 站的 NTA值以及接收到的包含目标基站的 ΤΑ信息的 ΤΑ命令, 确定上行发送时间。
其中, 所述包含目标基站的 ΤΑ信息的 ΤΑ命令通过步骤 202c的切换命令传送。 在一个实施方式中, 如图 2D所示, 本实施例的方法的各步骤还可以是以下顺序: 步骤 201d: UE根据小区测量请求进行小区测量并上报测量结果;
步骤 202d: 所述 UE在接收到服务基站发送的切换命令后, 断开与服务基站的连 接并保留原服务基站的上行时间调整参数 NTA, 并根据所述切换命令, 进行小区切换 和重配;
步骤 203d: 所述 UE在接收到包含目标基站的 TA信息的 TA命令后, 根据保留 的原服务基站的 NTA值以及所述目标基站的 TA信息, 确定上行发送时间; 步骤 204d: 所述 UE在接收到目标基站发送的上行资源分配信息后, 在重配完成 后, 在所确定的上行发送时间向所述目标基站反馈重配完成信息。
其中, 所述包含目标基站的 TA信息的 TA命令通过步骤 202d的切换命令传送。 通过本实施例的方法, 在 UE仍处于与原服务基站连接状态下, 使得目标基站检 测该 UE的上行信号获取该 UE与目标基站间的上行同步。 由此, 并不影响 UE与原 服务基站的数据传送。宏基站通过向 UE发送切换命令(目标基站的 RRC重配信息) 指示该 UE将原配置的服务基站替换为新的目标基站,并发送其与新的目标基站的上 行同步信息。 由此, UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区重 配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
实施例 2
本发明实施例还提供了一种小区切换与重配的方法, 该方法应用于宏基站。 图 3 是该方法的流程图, 请参照图 3, 该方法包括:
步骤 301 : 宏基站确定为 UE选择的目标基站;
步骤 302: 所述宏基站向所述 UE发送切换命令, 以便所述 UE根据所述切换命 令进行小区切换和重配。
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留原服务 基站的上行时间调整参数 NTA
在步骤 301的一个实施方式中, 宏基站通知 UE进行小区测量, 由此宏基站可以 自己为 UE选择目标基站。 则在该实施方式中, 步骤 301可以包括以下步骤:
S1 : 所述宏基站向所述 UE发送小区测量请求, 以便 UE根据所述小区测量请求 进行小区测量并上报;
其中,所述测量请求可能是通过信令来实现的,也可能是通过控制指令来实现的, 本实施例并不以此作为限制。
S2: 所述宏基站在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结 果为所述 UE选择目标基站。
其中, UE进行小区测量的方法与实施例 1相同, 其内容被合并于此, 在此不再 赘述。
其中, 宏基站根据 UE的测量结果, 为该 UE选取目标基站, 将其作为该 UE的 服务基站。 该目标基站根据宏基站的控制, 在某时刻开始检测 UE的上行信号 (例如 上行的信道探测参考信号 (SRS), 或上行数据信道 (PUSCH)), 以获取 UE相对于 目标基站的上行定时, 并根据该上行定时产生相应的上行时间提前 (TA) 信息。 在 此期间, UE仍保持与原服务基站的正常上下行通信。
在步骤 301的另外一个实施方式中, 由该 UE的原服务基站通知 UE进行小区测 量, 该 UE的原服务基站或者与该 UE的原服务基站处于同一个簇内的控制基站可以 根据 UE反馈的测量结果为该 UE选择目标基站。 此时, 宏基站通过与该 UE的原服 务基站或者与该 UE的原服务基站处于同一个簇内的控制基站的交互, 从该 UE的原 服务基站或者与该 UE 的原服务基站位于同一个簇内的控制基站获得该目标基站的 TA信息。 则在该实施方式中, 所述宏基站根据所述 UE 的服务基站或者与所述 UE 的服务基站位于同一个簇内的控制基站为所述 UE选择的目标基站, 确定为所述 UE 选择的目标基站。
在本实施例中, 宏基站还可以向该 UE发送上行资源分配 (UL allocation/grant) 信息, 以便所述 UE在重配完成后向该宏基站上报重配完成信息。
在本实施例中, 宏基站还可以向该 UE发送包括目标基站的时间提前(TA)信息 时间提前命令 (TAC), 以便该 UE根据其保留的服务基站的上行时间调整参数和该 目标基站的时间提前信息确定上行发送时间。 其中, 该 TAC可以通过前述切换命令 发送, 也可以通过前述上行资源分配信息发送, 还可以通过现有的 MAC命令发送。 其中, 在本实施例中, 还可以采用适当的机制避免 UE无法辨别由宏基站发送的 TA 是适用于宏基站自身的还是适用于目标基站的, 具体的机制在此不做限制。其中, 对 于 UE侧的处理已经在实施例 1中做了详细说明, 在此不再赘述。
通过本实施例的方法, 在 UE仍处于与原服务基站连接状态下, 使得目标基站检 测该 UE的上行信号获取该 UE与目标基站间的上行同步。 宏基站通过向 UE发送切 换命令 (目标基站的 RRC重配信息) 指示该 UE将原配置的服务基站替换为新的目 标基站, 并发送其与新的目标基站的上行同步信息。 由此, UE与新的目标基站建立 下行同步 /上行同步, 有效减少了小区重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
实施例 3
本发明实施例还提供了一种小区切换与重配的方法, 该方法应用于小区切换和重 配过程中的目标基站。 图 4是该方法的流程图, 请参照图 4, 该方法包括: 步骤 401 : 根据除本地之外的其他基站的控制检测 UE的上行信号;
其中, 如果是宏基站通知 UE进行小区测量并根据 UE反馈的测量结果为该 UE 选择目标基站, 则由宏基站控制该目标基站检测 UE的上行信号。 如果是该 UE的原 服务基站通知 UE进行小区测量并根据 UE反馈的测量结果为该 UE选择目标基站, 则由该 UE的原服务基站或者与该 UE的原服务基站为与同一个簇的控制基站控制该 目标基站检测 UE的上行信号。
其中, 例如可以检测信道探测参考信号 (SRS), 或者上行数据信道 (PUSCH) 等, 本实施例并不以此作为限制。
步骤 402: 获取所述 UE相对于本地的上行定时信息;
其中, 通过检测 UE的上行信号可以获得该 UE相对于本地的上行定时信息。 步骤 403: 根据所述上行定时信息计算本地的上行时间提前量;
其中,该目标基站可以以所述 UE的服务基站的下行时钟作为参考,根据所述 UE 保留的原服务基站的 NTA值和所述上行定时信息, 计算本地的上行时间提前量。该目 标基站也可以以本地(也即该目标基站) 的下行时钟作为参考, 根据所述 UE保留的 原服务基站的 NTA值和所述上行定时信息, 计算本地的上行时间提前量。其中, 目标 基站的下行时钟可通过用户测得上报给该目标基站, 也可以由该目标基站自行获得, 例如可根据上行信号的接收时延差,推算出下行信号的时延差,进而得到其下行时钟。
步骤 404: 将所述上行时间提前量提供给宏基站。
其中, 当目标基站通过检测 UE的上行信号获得了上行时间提前量之后, 通过交 互使得宏基站获知, 以便宏基站将其发送给 UE。 UE据此可以确定针对该目标基站 的上行发送时间。 其中, UE确定其针对该目标基站的上行发送时间的方法已经在实 施例 1作了详细说明, 在此不再赘述。其中, 本发明实施例还可以采用适当的机制避 免 UE无法辨别由宏基站发送的 TA是适用于宏基站自身的还是适用于目标基站的, 具体的机制在此不做限制。
其中, 在目标基站检测 UE的上行信号以确定 TA值的过程中, UE仍然保持与原 服务基站的正常上下行通信。
其中, 关于 UE与目标基站的下行同步, 可以在 UE尚未切换至目标基站时就对 目标基站进行下行时间同步。 也可以在 UE接收到重配信息后, 开始对目标基站进行 下行时间同步。 通过本实施例的方法, 在 UE仍处于与原服务基站连接状态下, 使得目标基站检 测该 UE的上行信号获取该 UE与目标基站间的上行同步。 宏基站通过向 UE发送切 换命令 (目标基站的 RRC重配信息) 指示该 UE将原配置的服务基站替换为新的目 标基站, 并发送其与新的目标基站的上行同步信息。 由此, UE与新的目标基站建立 下行同步 /上行同步, 有效减少了小区重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
实施例 4
本发明实施例还提供了一种小区切换与重配的方法, 该方法应用于小区切换和重 配过程中的 UE的原服务基站或者与该 UE的原服务基站处于同一个簇的控制基站或 者宏基站。 图 5是该方法的流程图, 请参照图 5, 该方法包括:
步骤 501 : 基站向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行 小区测量并上报;
其中, 这里的基站可以是宏基站, 如实施例 2所述; 也可以是该 UE的原服务基 站。 该宏基站或者该 UE的原服务基站通过通知该 UE进行小区测量, 以便根据 UE 上报的测量结果为该 UE选择目标基站。 其中, UE的测量方法已经在实施例 1进行 了详细说明, 在此不再赘述。
步骤 502: 所述基站在接收到所述 UE上报的小区测量结果后, 根据所述小区测 量结果为所述 UE选择目标基站,并控制所述目标基站检测上行信号以获得时间提前 信息。
其中, 所述基站为所述 UE的服务基站或者宏基站或者与所述 UE的服务基站位 于同一个簇中的控制基站。 该基站通过控制目标基站检测 UE 的上行信号获得上行 TA值, 以便 UE据此计算其针对该目标基站的上行发送时间。
在一个实施例中, 当该方法应用于服务基站时, 该方法还可以包括:
步骤 503 : 服务基站向所述 UE发送切换命令, 以便所述 UE根据所述切换命令 进行小区切换和重配。
其中, 该切换命令中可以包括目标基站的 TA信息, 以便 UE根据该目标基站的 TA信息以及保留的目标基站的 NTA确定上行发送时间。 具体的确定过程已在前述实 施例中做了说明, 在此不再赘述。
通过本实施例的方法, 在 UE仍处于与原服务基站连接状态下, 使得目标基站检 测该 UE的上行信号获取该 UE与目标基站间的上行同步。 宏基站通过向 UE发送切 换命令 (目标基站的 RRC重配信息) 指示该 UE将原配置的服务基站替换为新的目 标基站, 并发送其与新的目标基站的上行同步信息。 由此, UE与新的目标基站建立 下行同步 /上行同步, 有效减少了小区重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
上述实施例 1-实施例 4是以无线通信系统中的 UE进行小区切换和重配为例, 分 别从 UE、 宏基站、 目标基站以及服务基站的角度阐述了本发明实施的方法, 为了使 本发明实施例的方法更加清楚易懂,以下通过一个各装置之间的信息交互图对本实施 例的方法进行说明。
图 6是 UE进行小区切换和重配过程中各装置(UE、 宏基站、 原服务基站以及目 标基站) 之间的信息交互示意图, 请参照图 6, 该交互过程包括:
步骤 601 : 宏基站控制 UE进行小区测量;
其中, 也可以是该 UE的服务基站控制 UE进行小区测量。
步骤 602: 宏基站为 UE分配上行资源, UE利用该上行资源向宏基站上报测量结 果;
其中, 也可以是该 UE的服务基站为该 UE分配上行资源, UE将测量结果上报给 其服务基站。
步骤 603: 宏基站控制目标基站检测 UE的上行信号;
其中, 当 UE的原服务基站或者与其原服务基站位于同一个簇的控制基站根据上 述测量结果, 为该 UE选择目标基站时, 由该 UE的原服务基站或者与其原服务基站 位于同一个簇的控制基站控制该目标基站检测 UE的上行信号。
步骤 604: 目标基站检测 UE的上行信号, 计算 TA值;
步骤 605: 宏基站为 UE分配下行资源, 并且在所分配的下行资源上向 UE发送 切换命令 (RRC重配信息);
其中, 也可以由该 UE的服务基站为 UE分配下行资源并向 UE发送该切换命令。 步骤 606: 宏基站向 UE发送 TAC (包含目标基站的 TA值);
其中, TAC中的 TA值是该宏基站通过与目标基站交互获得的目标基站的 TA值。 其中, 该 TA值还可以通过步骤 605的切换命令传送, 或者通过步骤 609的上行资源 分配信息传送。 步骤 607: UE从原服务基站断开并同步到目标基站,同时保留原服务基站的 NTA, 以便确定上行发送时间;
步骤 608: 宏基站为 UE分配上行资源, 以便 UE利用该上行资源向宏基站上报 RRC重配完成信息。
其中, 也可以由该目标基站为该 UE分配上行资源, 以便 UE向该目标基站上报
RRC重配完成信息。 在本实施例中, 并不限制步骤 606和步骤 608的先后顺序。
在本实施例中, 关于 UE与目标基站的下行同步, 可以在 UE尚未切换至目标基 站时就对目标基站进行下行时间同步。 也可以在 UE接收到重配信息后, 开始对目标 基站进行下行时间同步。
在本实施例中, 如果原服务基站, 目标基站及宏基站的回程 (backhaul) 为理想 的, 例如原服务基站, 目标基站及宏基站连接在同一个 eNB上, 可以认为基站间的 交互信息是没有时延的。
本发明实施例还提供了一种用户设备, 如下面的实施例 5所述, 由于该用户设备 解决问题的原理与实施例 1的方法相同,因此其具体的实施可以参照实施例 1的方法 的实施, 重复之处不再赘述。
实施例 5
本发明实施例提供了一种用户设备 (UE)。 图 7是该 UE的组成示意图, 请参照 图 7, 该 UE包括:
测量单元 71, 其根据小区测量请求进行小区测量并上报测量结果;
处理单元 72,其在接收到宏基站或者原服务基站发送的切换命令后, 断开与原服 务基站的连接并保留原服务基站的上行时间调整参数 NTA;
配置单元 73, 其根据所述切换命令, 进行小区切换和重配。
其中, 该 UE还可以包括:
上报单元 74,其在接收到宏基站或者目标基站发送的上行资源分配信息时,根据 所述上行资源分配信息向所述宏基站或者所述目标基站反馈重配完成信息。
其中, 该 UE还可以包括:
确定单元 75, 其在接收到包含目标基站的 TA信息的时间提前命令时, 根据所述 上行时间调整参数和所述目标基站的 TA信息确定上行发送时间。
其中, 如果接收到宏基站发送的切换命令, 则所述上行时间提前命令可以通过所 述切换命令传送, 也可以通过所述上行资源分配信息传送, 还可以通过现有的 MAC 命令传送。如果接收到原服务基站发送的切换命令, 则所述上行时间提前命令通过上 述切换命令传送。
其中, 如果是向目标基站反馈重配完成信息, 则需要先由确定单元 75确定上行 发送时间, 再在确定的上行发送时间向目标基站反馈重配完成信息。
其中, 上行发送时间为 NTAnew=NTA―。 ld+TA。 其中, NTA—。ld 为 UE保留的服务基 站的 NTA值, TA为接收到的 TA信息中的 TA值。 更广义的, NTA—。ld为在收到新的 TA命令前的 NTA值, NTAnew为收到 TA命令后更新 NTA―。 ld的 NTA值。
其中,该确定单元 75可以根据所述目标基站的下行定时信息,以提前所述 NTAnew 个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留的原服务基站 的 NTA值加上 UE最近一次接收到的 TA值。其中,该确定单元 75也可以在接收到第 一个时间提前命令时, 以所述原服务基站的下行定时信息作为参考, 以提前所述 NTAnew个抽样点作为上行发送时间发送上行信号,所述 NTAnew等于 UE保留的原服务基 站的 NTA值加上所述 TA值;在接收到除第一个时间提前命令以外的时间提前命令时, 以所述目标基站的下行定时信息作为参考,以提前所述 NTA个抽样点作为上行发送时 间发送上行信号, 所述 NTAnew等于 NTA_。ld值加上所收到的 TA值。 该确定单元 75还 可以根据测量得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参考, 在 接收到第一个时间提前命令时, 以提前 NTAnew + Δ t个抽样点作为上行发送时间发送 上行信号, 在接收到除第一个时间提前命令以外的时间提前命令时, 以提前所述 NTA_new个抽样点作为上行发送时间发送上行信号。
通过本实施例的 UE, 根据宏基站或者原服务基站的切换命令将原配置的服务基 站替换为新的目标基站, 并发送其与新的目标基站的上行同步信息。 由此, 由于在 UE仍处于与原服务基站连接状态下, 目标基站检测该 UE的上行信号获取该 UE与 目标基站间的上行同步,使得 UE与新的目标基站建立下行同步 /上行同步,有效减少 了小区重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
本发明实施例还提供了一种宏基站, 如下面的实施例 6所述, 由于该宏基站解决 问题的原理与实施例 2的方法相同,因此其具体的实施可以参照实施例 2的方法的实 施, 重复之处不再赘述。
实施例 6 本发明实施例提供了一种宏基站。 图 8是该宏基站的组成示意图, 请参照图 8, 该宏基站包括:
确定单元 81, 其确定为 UE选择的目标基站;
发送单元 82, 其向所述 UE发送切换命令, 以便所述 UE根据所述切换命令进行 小区切换和重配。
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留原服务 基站的上行时间调整参数 NTA
在一个实施例中, 所述发送单元 82还向所述 UE发送小区测量请求, 以便 UE根 据所述小区测量请求进行小区测量并上报。 所述确定单元 81根据 UE上报的测量结 果为所述 UE选择目标基站。
在另一个实施例中,所述确定单元 81根据所述 UE的服务基站或者与所述 UE的 服务基站位于同一个簇内的控制基站为所述 UE选择的目标基站, 确定为所述 UE选 择的目标基站。
在一个实施例中, 所述宏基站还包括:
控制单元 83, 其在通过所述确定单元 81确定了 UE的目标基站后, 控制所述目 标基站检测上行信号以获得上行时间提前信息。
在一个实施例中,所述发送单元 82还可以向所述 UE发送上行资源分配信息, 以 便所述 UE在 RRC重配完成后上报重配完成信息。
在一个实施例中,所述发送单元 82还可以通过上述切换命令向所述 UE发送包含 目标基站的 TA信息的时间提前命令, 以便所述 UE根据保留的上行时间调整参数和 所述目标基站的时间提前信息确定上行发送时间。
在另外一个实施例中, 所述发送单元 82还可以通过上述上行资源分配信息向所 述 UE发送包含目标基站的 TA信息的时间提前命令, 以便所述 UE根据保留的上行 时间调整参数和所述目标基站的时间提前信息确定上行发送时间。
在另外一个实施例中, 所述发送单元 82还可以通过现有的 MAC信令向所述 UE 发送包含目标基站的 TA信息的时间提前命令, 以便所述 UE根据保留的上行时间调 整参数和所述目标基站的时间提前信息确定上行发送时间。
通过本实施例的宏基站, 在 UE仍处于与原服务基站连接状态下, 控制目标基站 检测该 UE的上行信号获取该 UE与目标基站间的上行同步, 并指示 UE将原配置的 服务基站替换为新的目标基站, 并发送其与新的目标基站的上行同步信息。 由此, 由 于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区重配 /切换过程 中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
本发明实施例还提供了一种目标基站, 如下面的实施例 7所述, 由于该目标基站 解决问题的原理与实施例 3的方法相同,因此其具体的实施可以参照实施例 3的方法 的实施, 重复之处不再赘述。
实施例 7
本发明实施例提供了一种基站。 图 9是该基站的组成示意图, 请参照图 9, 该基 站包括:
检测单元 91, 其根据除本地之外的其他基站的控制检测 UE的上行信号; 获取单元 92, 其获取所述 UE相对于本地的上行定时信息;
计算单元 93, 其根据所述上行定时信息计算本地的上行时间提前量;
处理单元 94, 其将所述上行时间提前量提供给宏基站。
在一个实施例中,所述计算单元 93可以以所述 UE的服务基站的下行时钟作为参 考, 根据所述 UE保留的服务基站的 NTA值和所述上行定时信息, 计算本地的上行时 间提前量。
在另外一个实施例中, 所述计算单元 93可以以本地的下行时钟作为参考, 根据 所述 UE保留的服务基站的 NTA值和所述上行定时信息,计算本地的上行时间提前量。 在该实施例中,所述计算单元 93可以通过所述获取单元 92从 UE获取本地的下行时 钟, 也可以根据接收到的信号时延差确定本地的下行时钟。
通过本实施例的目标基站, 在 UE仍处于与原服务基站连接状态下, 根据其他基 站的控制检测该 UE的上行信号获取该 UE与目标基站间的上行同步, 并发送其与新 的目标基站的上行同步信息。由此, 由于使得 UE与新的目标基站建立下行同步 /上行 同步, 有效减少了小区重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的 复杂度。
本发明实施例还提供了一种基站, 如下面的实施例 8所述, 由于该基站解决问题 的原理与实施例 4的方法相同, 因此其具体的实施可以参照实施例 4的方法的实施, 重复之处不再赘述。
实施例 8 本发明实施例还提供了一种基站。 图 10是该基站的组成示意图, 请参照图 10, 该基站包括:
发送单元 101, 其向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进 行小区测量并上报;
选择单元 102, 其在接收到所述 UE上报的小区测量结果后, 根据所述小区测量 结果为所述 UE选择目标基站;
控制单元 103, 其控制所述目标基站检测 UE的上行信号以获得上行时间提前信 息。
其中, 所述基站可以是所述 UE的服务基站, 也可以是宏基站。
本发明实施例还提供了一种控制基站, 该控制基站与所述 UE的原服务基站处于 同一个簇。 在该实施例中, 该控制基站从该 UE的原服务基站或者宏基站获得 UE的 小区测量结果, 通过选择单元 102为所述 UE选择目标基站, 并通过控制单元 103控 制该目标基站检测 UE的上行信号以获得上行时间提前信息。
通过本实施例的基站, 在 UE仍处于与原服务基站连接状态下, 控制目标基站检 测该 UE的上行信号获取该 UE与目标基站间的上行同步, 并发送其与新的目标基站 的上行同步信息。 由此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效 减少了小区重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
本发明实施例还提供了一种小区切换与重配的方法,与实施例 1-实施例 4不同的 是, 本发明实施例的方法没有宏基站的参与, 而是由 UE的服务基站通知 UE进行小 区测量并上报测量结果, 由该 UE的服务基站根据该 UE上报的测量结果为该 UE选 择目标基站, 并控制该目标基站检测 UE的上行信号以获得上行 TA值, 并由该 UE 的服务基站向 UE发送切换命令 (目标基站的 RRC重配信息), 由该 UE的目标基站 向 UE发送上行资源分配信息。其中, 所述切换命令或者所述上行资源分配信息可以 包括目标基站的 TA值, 该目标基站的 TA值还可以通过现有的 MAC信令传送。 在 以下的说明中, 与实施例 1-实施例 4相同的内容不再重复说明。
实施例 9
本发明实施例提供了一种小区切换与重配的方法。 图 11 是该方法的流程图, 请 参照图 11, 该方法包括:
步骤 1101 : 用户设备 (UE ) 根据其服务基站发送的小区测量请求进行小区测量 并上报测量结果;
步骤 1102: 所述 UE在接收到其服务基站发送的切换命令 (目标基站的 RRC重 配信息) 后, 断开与服务基站的连接并保留服务基站的上行时间调整参数 NTA; 步骤 1103: 所述 UE根据所述切换命令, 进行小区切换和重配。
其中, UE 可以采用现有手段进行小区切换和重配, 本发明实施例并不以此作为 限制。并且,在切换过程中,原服务基站会向目标基站提供缓冲和中转数据包(deliver buffered and transit packets to target eNB),并将序号状态 ( SN Status, Sequence Number Status ) 发送给目标基站 ( SN status transfer ), 然后向目标基站传输数据 ( data forwarding ) , 目标基站可以从原服务基站收到该缓冲数据包 (buffer packets from source eNB )。
在一个实施例中, 所述方法还包括:
步骤 1104: 所述 UE在接收到包含目标基站的上行时间提前信息的时间提前命令 时,根据所述上行时间调整参数和所述目标基站的上行时间提前信息,确定上行发送 时间。
在一个实施例中, 所述方法还包括:
步骤 1105: 所述 UE在接收到所述目标基站发送的上行资源分配信息后, 在完成 RRC 重配后, 根据所述上行资源分配信息在所述确定的上行发送时间向所述目标基 站反馈重配完成信息。
其中, 所述时间提前命令可以通过所述切换命令由上述服务基站传送, 也可以通 过所述上行资源分配信息由所述目标基站传送。 如果通过上行资源分配信息传送该 TA命令, 则 UE先收到该上行资源分配信息, 然后确定上行发送时间, 最后在确定 的上行发送时间向目标基站反馈重配完成信息。
其中, 上行发送时间 NTAnew=NTA―。 ld+TA。 其中, NTA―。 ld为 UE保留的服务基站 的 NTA值, TA为接收到的目标基站的 TA信息中的 TA值。 更广义的, NTA—。ld为在收 到新的 TA命令前的 NTA值, NTAnew为收到 TA命令后更新 NTA—。ld的 NTA值。
具体的, 所述 UE 可以以所述目标基站的下行定时信息作为参考, 以提前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留的原服 务基站的 NTA值加上 UE最近一次接收到的 ΤΑ值。 所述 UE也可以在接收到第一个 时间提前命令时, 以保留的所述服务基站的下行定时信息作为参考, 以提前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留的原服 务基站的 NTA值加上所述 TA值; 在接收到除第一个时间提前命令以外的时间提前命 令时, 以所述目标基站的下行定时信息作为参考, 以提前所述 NTAnew个抽样点作为 上行发送时间发送上行信号, 所述 NTAnew等于 NTA_。ld值加上所收到的 TA值。 所述 UE 还可以根据测量得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参 考, 在接收到第一个时间提前命令时, 以提前 NTAnew + A t个抽样点作为上行发送时 间, 在接收到除第一个时间提前命令以外的时间提前命令时, 以提前所述 NTA—„^个 抽样点作为上行发送时间发送上行信号。
在本实施例中, 与实施例 1相同, 也不限制各步骤的执行顺序, 具体实施时, 根 据实际情况确定。
通过本实施例的方法, 在 UE还处于与服务基站的连接状态时, 其服务基站为其 选择的目标基站就开始检测其上行信号以确定该 UE 与该目标基站的上行时间提前 量, UE再根据其服务基站的切换命令将原配置的服务基站替换为新的目标基站。 由 此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区重配 /切 换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
实施例 10
本发明实施例还提供了一种小区切换与重配的方法。 图 12是该方法的流程图, 请参照图 12, 该方法包括:
步骤 1201 : 服务基站向 UE发送小区测量请求, 以便 UE根据所述小区测量请求 进行小区测量并上报;
步骤 1202: 所述服务基站在接收到所述 UE上报的小区测量结果后, 根据所述小 区测量结果为所述 UE选择目标基站;
步骤 1203: 所述服务基站控制所述目标基站检测上行信号以获得时间提前信息。 在一个实施例中, 所述方法还包括:
步骤 1204: 所述服务基站向所述 UE发送切换命令, 以便所述 UE根据所述切换 命令进行小区切换和重配。
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 ΝΤΑ
在本实施例中, 所述切换命令可以包含时间提前命令, 所述时间提前命令中包括 所述目标基站的上行时间提前信息(TA值), 以便所述 UE根据其保留的上行时间调 整参数 NTA和所述目标基站的上行时间提前信息 (TA值) 确定上行发送时间。
通过本实施例的方法, 在 UE还处于与服务基站的连接状态时, 该服务基站就控 制为所述 UE选择的目标基站检测该 UE的上行信号以确定该 UE与该目标基站的上 行时间提前量, 该 UE的服务基站再指示该 UE将原配置的服务基站替换为新的目标 基站。 由此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区 重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
实施例 11
本发明实施例还提供了一种小区切换与重配的方法。 图 13 是该方法的流程图, 请参照图 13, 该方法包括:
步骤 1301 : 目标基站根据 UE的服务基站的控制检测所述 UE的上行信号; 步骤 1302: 所述目标基站获取所述 UE相对于本地的上行定时信息;
步骤 1303: 所述目标基站根据所述上行定时信息计算本地的上行时间提前量; 步骤 1304: 所述目标基站将所述上行时间提前量提供给所述 UE的服务基站。 在步骤 1303中,该目标基站可以以所述 UE的服务基站的下行时钟作为参考,根 据所述 UE保留的服务基站的 NTA值和所述上行定时信息,计算本地的上行时间提前 在步骤 1303 中, 该目标基站也可以以本地的下行时钟作为参考, 根据所述 UE 保留的服务基站的 NTA值和所述上行定时信息, 计算本地的上行时间提前量。 其中, 所述本地的下行时钟可以是所述目标基站从 UE获取到的,也可以是所述目标基站根 据接收到的信号时延差确定的。 如实施例 3所述, 在此不再赘述。
在一个实施例中, 所述方法还包括:
步骤 1305: 所述目标基站向所述 UE发送上行资源分配信息, 以便所述 UE根据 所述上行资源分配信息反馈重配完成信息。
在本实施例中, 所述上行资源分配信息中可以包含时间提前命令, 所述时间提前 命令中包括所述目标基站的上行时间提前信息, 以便所述 UE根据保留的上行时间调 整参数和所述目标基站的上行时间提前信息确定上行发送时间。
通过本实施例的方法, 在 UE还处于与服务基站的连接状态时, 其服务基站为其 选择的目标基站就开始检测其上行信号以确定该 UE 与该目标基站的上行时间提前 量, UE再根据其服务基站的指示将原配置的服务基站替换为新的目标基站。 由此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区重配 /切换过 程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
上述实施例 9-实施例 11是以无线通信系统中的 UE进行小区切换和重配为例, 分别从 UE、 服务基站和目标基站的角度阐述了本发明实施例的方法, 为了使本发明 实施例的方法更加清楚易懂,以下通过一个各装置之间的信息交互图对本实施例的方 法进行说明。
图 14是 UE进行小区切换和重配过程中各装置(UE、 服务基站、 以及目标基站) 之间的信息交互示意图, 请参照图 14, 该交互过程包括:
步骤 1401 : UE的原服务基站控制 UE进行小区测量;
步骤 1402: 所述原服务基站为所述 UE分配上行资源, 以便所述 UE利用所述上 行资源向所述服务基站上报测量结果;
步骤 1403: 所述 UE的原服务基站控制目标基站检测 UE的上行信号; 其中, 也可以是与该 UE的原服务基站位于同一个簇的控制基站控制目标基站检 测 UE的上行信号。
步骤 1404: 目标基站检测 UE的上行信号, 计算 TA值;
步骤 1405: 所述 UE的原服务基站为 UE分配下行资源, 在所分配的下行资源上 向 UE发送 RRC重配信息;
其中, 所述 UE的原服务基站可能通过同一个信令同时向 UE发送 TA信息。 步骤 1406: UE从原服务基站断开并同步到目标基站,同时保留原服务基站的 NTA, 以便确定上行发送时间。
步骤 1407: 目标基站为 UE分配上行资源, 以便 UE根据利用所述上行资源向目 标基站上报 RRC重配完成信息。
其中, 目标基站也可以通过同一个信令向该 UE发送 TA信息。
在本实施例中, 如果原服务基站和目标基站的回程 (backhaul) 为理想的, 但小 基站 (原服务基站和目标基站) 与宏基站的回程 (backhaul) 时延较大, 例如原服务 基站和目标基站连接在同一个 eNB上, 宏基站连接在另一个 eNB上, 可以认为小基 站间的交互信息是没有时延的, 而小基站与宏站间的交互信息是有时延的。
本发明实施例还提供了一种用户设备, 如下面的实施例 12所述, 由于该用户设 备解决问题的原理与实施例 9的方法类似,因此其具体的实施可以参照实施例 9的方 法的实施, 重复之处不再赘述。
实施例 12
本发明实施例提供了一种用户设备(UE)。 图 15该 UE的组成示意图, 请参照图 15, 该 UE包括:
测量单元 151, 其根据服务基站的小区测量请求进行小区测量并上报测量结果; 处理单元 152, 其在接收到服务基站发送的切换命令后, 断开与服务基站的连接 并保留服务基站的上行时间调整参数 NTA;
配置单元 153, 其根据所述切换命令, 进行小区切换和重配。
在一个实施例中, 所述 UE还包括:
确定单元 154,其在接收到包含目标基站的上行时间提前信息的时间提前命令时, 根据所述上行时间调整参数和所述目标基站的上行时间提前信息确定上行发送时间。
在一个实施例中, 所述 UE还包括:
上报单元 155,其在接收到目标基站发送的上行资源分配信息时,在完成 RRC重 配后向所述目标基站反馈重配完成信息。
其中, 该上行时间提前信息可以通过所述切换命令传送, 也可以通过所述上行资 源分配信息传送。 如果通过上行资源分配信息传送该 TA命令, 则 UE先收到该上行 资源分配信息,然后确定上行发送时间, 最后在确定的上行发送时间向目标基站反馈 重配完成信息。
其中, 上行发送时间 NTAnew=NTA—。ld+TA。 其中, NTA—。ld为 UE保留的服务基站 的 NTA值, TA为接收到的目标基站的 TA信息中的 TA值。 更广义的, NTA—。ld为在收 到新的 TA命令前的 NTA值, NTAnew为收到 TA命令后更新 NTA—。ld的 NTA值。
具体的, 所述 UE 可以以所述目标基站的下行定时信息作为参考, 以提前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留的原服 务基站的 NTA值加上 UE最近一次接收到的 ΤΑ值。 所述 UE也可以在接收到第一个 时间提前命令时, 以保留的所述服务基站的下行定时信息作为参考, 以提前所述 NTA new个抽样点作为上行发送时间发送上行信号, 所述 NTAnew等于 UE保留的原服 务基站的 NTA值加上所述 TA值; 在接收到除第一个时间提前命令以外的时间提前命 令时, 以所述目标基站的下行定时信息作为参考, 以提前所述 NTAnew个抽样点作为 上行发送时间发送上行信号, 所述 NTAnew等于 NTA_。ld值加上所收到的 TA值。 所述 UE 还可以根据测量得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参 考, 在接收到第一个时间提前命令时, 以提前 NTAnew + A t个抽样点作为上行发送时 间, 在接收到除第一个时间提前命令以外的时间提前命令时, 以提前所述 NTA—„^个 抽样点作为上行发送时间发送上行信号。
通过本实施例的 UE, 在该 UE还处于与服务基站的连接状态时, 其服务基站为 其选择的目标基站就开始检测其上行信号以确定该 UE与该目标基站的上行时间提前 量, UE再根据其服务基站的切换命令将原配置的服务基站替换为新的目标基站。 由 此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区重配 /切 换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
本发明实施例还提供了一种服务基站, 如下面的实施例 13所述, 由于该服务基 站解决问题的原理与实施例 10 的方法类似, 因此其具体的实施可以参照实施例 10 的方法的实施, 重复之处不再赘述。
实施例 13
本发明实施例还提供了一种基站。 图 16是该基站的组成示意图, 请参照图 16, 该基站包括:
发送单元 161, 其向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进 行小区测量并上报;
选择单元 162, 其在接收到所述 UE上报的小区测量结果后, 根据所述小区测量 结果为所述 UE选择目标基站;
控制单元 163, 其控制所述目标基站检测上行信号以获得时间提前信息。
在一个实施例中, 所述发送单元 161还用于向所述 UE发送切换命令, 以便所述 UE根据所述切换命令进行小区切换和重配。
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
在一个实施例中, 所述切换命令中包含时间提前命令, 所述时间提前命令中包括 所述目标基站的上行时间提前信息, 以便所述 UE根据保留的上行时间调整参数和所 述目标基站的上行时间提前信息确定上行发送时间。
通过本实施例的方法, 在 UE还处于与服务基站的连接状态时, 该服务基站就控 制为所述 UE选择的目标基站检测该 UE的上行信号以确定该 UE与该目标基站的上 行时间提前量, 该 UE的服务基站再指示该 UE将原配置的服务基站替换为新的目标 基站。 由此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区 重配 /切换过程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
本发明实施例还提供了一种目标基站, 如下面的实施例 14所述, 由于该目标基 站解决问题的原理与实施例 11的方法类似,因此其具体的实施可以参照实施例 11的 方法的实施, 重复之处不再赘述。
实施例 14
本发明实施例还提供了一种基站。 图 17是该基站的组成示意图, 请参照图 17, 该基站包括:
检测单元 171, 其根据 UE的服务基站的控制检测所述 UE的上行信号; 获取单元 172, 其获取所述 UE相对于本地的上行定时信息;
计算单元 173, 其根据所述上行定时信息计算本地的上行时间提前量; 处理单元 174, 其将所述上行时间提前量提供给所述 UE的服务基站。
在一个实施例中, 所述计算单元 173可以以所述 UE的服务基站的下行时钟作为 参考, 根据所述 UE保留的服务基站的 NTA值和所述上行定时信息, 计算本地的上行 时间提前量。
在另外一个实施例中, 所述计算单元 173可以以本地的下行时钟作为参考, 根据 所述 UE保留的服务基站的 NTA值和所述上行定时信息,计算本地的上行时间提前量。 在该实施例中,所述计算单元 173可以通过上述获取单元 172从所述 UE获取本地的 下行时钟, 也可以根据接收到的信号时延差确定本地的下行时钟。
在一个实施例中, 所述基站还包括:
发送单元 175, 其向所述 UE发送上行资源分配信息, 以便所述 UE根据所述上 行资源分配信息反馈重配完成信息。
在本实施例中, 所述上行资源分配信息中可以包含时间提前命令, 所述时间提前 命令中包括所述目标基站的上行时间提前信息, 以便所述 UE根据保留的上行时间调 整参数和所述目标基站的上行时间提前信息确定上行发送时间。
通过本实施例的方法, 在 UE还处于与服务基站的连接状态时, 其服务基站为其 选择的目标基站就开始检测其上行信号以确定该 UE 与该目标基站的上行时间提前 量, UE再根据其服务基站的指示将原配置的服务基站替换为新的目标基站。 由此, 由于使得 UE与新的目标基站建立下行同步 /上行同步, 有效减少了小区重配 /切换过 程中由于上 /下行同步导致的时延, 降低了 UE的复杂度。
本发明实施例还提供了一种通信系统, 其中, 所述通信系统包括实施例 5所述的 UE以及实施例 6所述的宏基站以及实施例 7所述的目标基站和实施例 8所述的服务 基站。
本发明实施例还提供了一种通信系统, 其中, 所述通信系统包括实施例 12所述 的 UE, 以及实施例 13所述的服务基站, 以及实施例 14所述的目标基站。
本发明实施例还提供了一种计算机可读程序,其中当在基站中执行该程序时, 该 程序使得计算机在所述基站中执行实施例 2-4、 10-11所述的小区切换与重配的方法。
本发明实施例还提供了一种存储有计算机可读程序的存储介质,其中该计算机可 读程序使得计算机在基站中执行实施例 2-4、 10-11所述的小区切换与重配的方法。
本发明实施例还提供了一种计算机可读程序, 其中当在终端设备中执行该程序 时, 该程序使得计算机在所述终端设备中执行实施例 1、 9所述的小区切换与重配的 方法。
本发明实施例还提供了一种存储有计算机可读程序的存储介质,其中该计算机可 读程序使得计算机在终端设备中执行实施例 1、 9所述的小区切换与重配的方法。
本发明以上的装置和方法可以由硬件实现, 也可以由硬件结合软件实现。本发明 涉及这样的计算机可读程序, 当该程序被逻辑部件所执行时, 能够使该逻辑部件实现 上文所述的装置或构成部件, 或使该逻辑部件实现上文所述的各种方法或步骤。逻辑 部件例如现场可编程逻辑部件、微处理器、计算机中使用的处理器等。本发明还涉及 用于存储以上程序的存储介质, 如硬盘、 磁盘、 光盘、 DVD、 flash存储器等。
以上结合具体的实施方式对本发明进行了描述,但本领域技术人员应该清楚,这 些描述都是示例性的, 并不是对本发明保护范围的限制。本领域技术人员可以根据本 发明的精神和原理对本发明做出各种变型和修改,这些变型和修改也在本发明的范围 内。

Claims

权 利 要 求 书
1、 一种小区切换与重配的方法, 其中, 所述方法包括:
用户设备 (UE) 根据小区测量请求进行小区测量并上报测量结果;
所述 UE在接收到宏基站或者所述 UE的服务基站发送的切换命令时, 断开与服 务基站的连接并保留服务基站的上行时间调整参数 NTA;
所述 UE根据所述切换命令, 进行小区切换与重配。
2、根据权利要求 1所述的方法, 其中, 所述 UE根据所述切换命令, 进行小区切 换与重配的步骤包括:
所述 UE在接收到宏基站或者目标基站发送的上行资源分配消息时, 根据所述上 行资源分配信息向所述宏基站或者所述目标基站反馈重配完成信息。
3、根据权利要求 2所述的方法, 其中, 所述 UE根据所述切换命令, 进行小区切 换与重配的步骤还包括:
所述 UE在接收到包含目标基站的上行时间提前信息的时间提前命令时, 根据所 述上行时间调整参数和所述目标基站的上行时间提前信息确定上行发送时间。
4、 根据权利要求 3所述的方法, 其中,
如果所述 UE从所述宏基站接收到所述切换命令, 则包含所述目标基站的上行时 间提前信息的时间提前命令通过所述切换命令传送或者通过所述上行资源分配信息 传送或者通过预定的 MAC信令传送;
如果所述 UE从所述服务基站接收到所述切换命令, 则包含所述目标基站的上行 时间提前信息的时间提前命令通过所述切换命令传送。
5、 根据权利要求 3所述的方法, 其中, 所述确定上行发送时间的步骤包括: 所述 UE以所述目标基站的下行定时信息作为参考,以提前 NTAnew个抽样点作为 上行发送时间; 或者
所述 UE在接收到第一个时间提前命令时, 以所述服务基站的下行定时信息作为 参考, 以提前所述 NTA—„^个抽样点作为上行发送时间; 在接收到除第一个时间提前 命令以外的时间提前命令时, 以所述目标基站的下行定时信息作为参考, 以提前所述 NTAnew个抽样点作为上行发送时间; 或者
所述 UE根据测量得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参 考, 在接收到第一个时间提前命令时, 以提前 NTAnew + A t个抽样点作为上行发送时 间, 在接收到除第一个时间提前命令以外的时间提前命令时, 以提前 NTAnew个抽样 点作为上行发送时间;
其中, 上行发送时间 NTAnew=NTA—。ld+TA, 其中, NTA―。 ld为 UE保留的服务基站 的 NTA值, TA为接收到的目标基站的 TA值。
6、 一种小区切换与重配的方法, 其中, 所述方法包括:
宏基站确定为 UE选择的目标基站;
所述宏基站向所述 UE发送切换命令, 以便所述 UE根据所述切换命令进行小区 切换和重配;
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
7、根据权利要求 6所述的方法, 其中, 所述宏基站确定为 UE选择的目标基站的 步骤包括:
所述宏基站向所述 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行 小区测量并上报;
所述宏基站根据接收到的 UE上报的小区测量结果, 为所述 UE选择目标基站。
8、根据权利要求 6所述的方法, 其中, 所述宏基站确定为 UE选择的目标基站的 步骤包括:
所述宏基站根据所述 UE的服务基站或者与所述 UE的服务基站位于同一个簇内 的控制基站为所述 UE选择的目标基站, 确定为所述 UE选择的目标基站。
9、 根据权利要求 6所述的方法, 其中, 所述方法还包括:
所述宏基站向所述 UE发送上行资源分配信息, 以便所述 UE在 RRC重配完成后 上报重配完成信息。
10、 根据权利要求 6-9任一项所述的方法, 其中, 所述方法还包括:
所述宏基站向所述 UE发送包含目标基站的上行时间提前信息的时间提前命令, 以便所述 UE根据所述目标基站的上行时间提前信息和保留的服务基站的上行时间调 整参数确定上行发送时间;
其中, 所述时间提前命令通过所述切换命令传送或者通过所述上行资源分配信息 传送或者通过预定的 MAC信令传送。
11、 一种小区切换与重配的方法, 其中, 所述方法包括:
根据除本地以外的其他基站的控制检测 UE的上行信号;
获取所述 UE相对于本地的上行定时信息;
根据所述上行定时信息计算本地的上行时间提前量;
将所述上行时间提前量提供给宏基站。
12、 根据权利要求 11 所述的方法, 其中, 根据所述上行定时信息计算本地的上 行时间提前量的步骤包括:
以所述 UE的服务基站的下行时钟作为参考,根据所述 UE保留的服务基站的 NTA 值和所述上行定时信息, 计算本地的上行时间提前量; 或者
以本地的下行时钟作为参考, 根据所述 UE保留的服务基站的 NTA值和所述上行 定时信息, 计算本地的上行时间提前量。
13、 根据权利要求 12所述的方法, 其中, 当以本地的下行时钟作为参考计算本 地的上行时间提前量时, 所述方法还包括:
从 UE获取本地的下行时钟; 或者
根据接收到的信号时延差确定本地的下行时钟。
14、 一种小区切换与重配的方法, 其中, 所述方法包括:
基站向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行小区测量并 上报;
所述基站在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果为所 述 UE选择目标基站;
控制所述目标基站检测所述 UE 的上行信号以获得目标基站的上行时间提前信 息。
15、 一种用户设备 (UE), 其中, 所述 UE包括:
测量单元, 其根据小区测量请求进行小区测量并上报测量结果;
处理单元, 其在接收到宏基站或者所述 UE的服务基站发送的切换命令时, 断开 与服务基站的连接并保留服务基站的上行时间调整参数 NTA;
配置单元, 其根据所述切换命令, 进行小区切换和重配。
16、 根据权利要求 15所述的 UE, 其中, 所述 UE还包括:
上报单元, 其在接收到宏基站或者目标基站发送的上行资源分配信息时, 根据所 述上行资源分配信息向所述宏基站或者所述目标基站反馈重配完成信息。
17、 根据权利要求 15所述的 UE, 其中, 所述 UE还包括:
确定单元, 其在接收到包含目标基站的上行时间提前信息的时间提前命令时, 根 据所述上行时间调整参数和所述目标基站的上行时间提前信息确定上行发送时间。
18、 根据权利要求 17所述的 UE, 其中,
如果所述 UE从所述宏基站接收到所述切换命令, 则包含所述目标基站的上行时 间提前信息的时间提前命令通过所述切换命令传送或者通过所述上行资源分配信息 传送或者通过预定的 MAC信令传送;
如果所述 UE从所述服务基站接收到所述切换命令, 则包含所述目标基站的上行 时间提前信息的时间提前命令通过所述切换命令传送。
19、 根据权利要求 17所述的 UE, 其中, 所述确定单元:
以所述目标基站的下行定时信息作为参考, 以提前 NTAnew个抽样点作为上行发 送时间; 或者
在接收到第一个时间提前命令时, 以所述服务基站的下行定时信息作为参考, 以 提前 NTA—„^个抽样点作为上行发送时间; 在接收到除第一个时间提前命令以外的时 间提前命令时, 以所述目标基站的下行定时信息作为参考, 以提前 NTA—„^个抽样点 作为上行发送时间; 或者
根据测量得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参考,在接 收到第一个时间提前命令时, 以提前 NTAnew + A t个抽样点作为上行发送时间, 在接 收到除第一个时间提前命令以外的时间提前命令时, 以提前 NTAnew个抽样点作为上 行发送时间;
其中, 上行发送时间 NTAnew=NTA—。ld+TA, 其中, NTA―。 ld为 UE保留的服务基站 的 NTA值, TA为接收到的目标基站的 TA值。
20、 一种宏基站, 其中, 所述宏基站包括:
确定单元, 其确定为 UE选择的目标基站;
发送单元, 其向所述 UE发送切换命令, 以便所述 UE根据所述切换命令进行小 区切换和重配;
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
21、根据权利要求 20所述的宏基站, 其中, 所述确定单元通过向所述 UE发送小 区测量请求, 使 UE 根据所述小区测量请求进行小区测量并上报, 并在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果为所述 UE选择目标基站。
22、根据权利要求 20所述的宏基站, 其中, 所述确定单元根据所述 UE的服务基 站或者与所述 UE 的服务基站位于同一个簇内的控制基站为所述 UE选择的目标基 站, 确定为所述 UE选择的目标基站。
23、根据权利要求 20所述的宏基站, 其中, 所述发送单元还用于向所述 UE发送 上行资源分配信息, 以便所述 UE在重配完成后上报重配完成信息。
24、 根据权利要求 20-23任一项所述的宏基站, 其中, 所述发送单元还用于向所 述 UE发送包含目标基站的上行时间提前信息的时间提前命令, 以便所述 UE根据保 留的上行时间调整参数和所述目标基站的上行时间提前信息确定上行发送时间; 其中, 所述时间提前命令通过所述切换命令传送或者通过所述上行资源分配信息 传送或者通过预定的 MAC信令传送。
25、 一种基站, 其中, 所述基站包括:
检测单元, 其根据除本地以外的其他基站的控制检测 UE的上行信号; 获取单元, 其获取所述 UE相对于本地的上行定时信息;
计算单元, 其根据所述上行定时信息计算本地的上行时间提前量;
处理单元, 其将所述上行时间提前量提供给宏基站。
26、 根据权利要求 25所述的基站, 其中, 所述计算单元:
以所述 UE的服务基站的下行时钟作为参考,根据所述 UE保留的服务基站的 NTA 值和所述上行定时信息, 计算本地的上行时间提前量; 或者
以本地的下行时钟作为参考, 根据所述 UE保留的服务基站的 NTA值和所述上行 定时信息, 计算本地的上行时间提前量。
27、 根据权利要求 26所述的基站, 其中, 当所述计算单元以本地的下行时钟作 为参考计算本地的上行时间提前量时, 通过获取单元从 UE获取本地的下行时钟; 或 者, 根据接收到的信号时延差确定本地的下行时钟。
28、 一种基站, 其中, 所述基站包括:
发送单元, 其向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行小 区测量并上报; 选择单元, 其在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果 为所述 UE选择目标基站;
控制单元, 其控制所述目标基站检测上行信号以获得目标基站的上行时间提前信 息。
29、 一种小区切换与重配的方法, 其中, 所述方法包括:
用户设备 (UE) 根据服务基站的小区测量请求进行小区测量并上报测量结果; 所述 UE在接收到服务基站发送的切换命令后, 断开与服务基站的连接并保留服 务基站的上行时间调整参数 NTA;
所述 UE根据所述切换命令, 进行小区切换和重配。
30、 根据权利要求 29所述的方法, 其中, 所述方法还包括:
所述 UE在接收到包含目标基站的上行时间提前信息的时间提前命令时, 根据所 述服务基站的上行时间调整参数和所述目标基站的上行时间提前信息,确定上行发送 时间。
31、 根据权利要求 30所述的方法, 其中, 所述方法还包括:
所述 UE在接收到目标基站发送的上行资源分配信息后, 在重配完成后, 根据所 述上行资源分配信息在所确定的上行发送时间向所述目标基站反馈重配完成信息。
32、 根据权利要求 31 所述的方法, 其中, 所述包含目标基站的上行时间提前信 息的时间提前命令通过上述切换命令由所述服务基站发送,或者通过上述上行资源分 配信息由所述目标基站发送。
33、 根据权利要求 31所述的方法, 其中, 所述确定上行发送时间的步骤包括: 所述 UE以所述目标基站的下行定时信息作为参考,以提前 NTAnew个抽样点作为 上行发送时间; 或者
所述 UE在接收到第一个时间提前命令时, 以所述服务基站的下行定时信息作为 参考, 以提前 NTA—„^个抽样点作为上行发送时间; 在接收到除第一个时间提前命令 以外的时间提前命令时, 以所述目标基站的下行定时信息作为参考, 以提前 NTAnew 个抽样点作为上行发送时间; 或者
所述 UE根据测量得到的下行定时差 Δ ί, 以所述目标基站的下行定时信息作为参 考, 在接收到第一个时间提前命令时, 以提前 NTAnew + A t个抽样点作为上行发送时 间, 在接收到除第一个时间提前命令以外的时间提前命令时, 以提前 NTA new个抽样 点作为上行发送时间;
其中, 上行发送时间 NTAnew=NTA―。 ld+TA, 其中, NTA―。 ld为 UE保留的服务基站 的 NTA值, TA为接收到的目标基站的 TA值。
34、 一种小区切换与重配的方法, 其中, 所述方法包括:
向 UE发送小区测量请求,以便 UE根据所述小区测量请求进行小区测量并上报; 在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果为所述 UE选 择目标基站;
控制所述目标基站检测上行信号以获得目标基站的上行时间提前信息; 向所述 UE发送切换命令,以便所述 UE根据所述切换命令进行小区切换和重配; 其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
35、 根据权利要求 34所述的方法, 其中, 所述切换命令包含时间提前命令, 所 述时间提前命令包括所述目标基站的上行时间提前信息, 以便所述 UE根据保留的上 行时间调整参数和所述目标基站的上行时间提前信息确定上行发送时间。
36、 一种小区切换与重配的方法, 其中, 所述方法包括:
根据 UE的服务基站的控制检测所述 UE的上行信号;
获取所述 UE相对于本地的上行定时信息;
根据所述上行定时信息计算本地的上行时间提前量;
将包含所述上行时间提前量的上行时间提前信息提供给所述 UE的服务基站。
37、 根据权利要求 36所述的方法, 其中, 根据所述上行定时信息计算本地的上 行时间提前量的步骤包括:
以所述 UE的服务基站的下行时钟作为参考,根据所述 UE保留的服务基站的 NTA 值和所述上行定时信息, 计算本地的上行时间提前量; 或者
以本地的下行时钟作为参考, 根据所述 UE保留的服务基站的 NTA值和所述上行 定时信息, 计算本地的上行时间提前量。
38、 根据权利要求 37所述的方法, 其中, 当以本地的下行时间作为参考计算本 地的上行时间提前量时, 所述方法还包括:
从 UE获取本地的下行时钟; 或者
根据接收到的信号时延差确定本地的下行时钟。
39、 根据权利要求 37所述的方法, 其中, 所述方法还包括:
向所述 UE发送上行资源分配信息, 以便所述 UE根据所述上行资源分配信息反 馈重配完成信息。
40、 根据权利要求 39所述的方法, 其中, 所述上行资源分配信息中包含时间提 前命令, 所述时间提前命令中包括所述目标基站的上行时间提前量, 以便所述 UE根 据保留的上行时间调整参数和所述目标基站的上行时间提前量确定上行发送时间。
41、 一种用户设备 (UE), 其中, 所述 UE包括:
测量单元, 其根据服务基站的小区测量请求进行小区测量并上报测量结果; 处理单元, 其在接收到服务基站发送的切换命令后, 断开与服务基站的连接并保 留服务基站的上行时间调整参数 NTA;
配置单元, 其根据所述切换命令, 进行小区切换和重配。
42、 根据权利要求 41所述的 UE, 其中, 所述 UE还包括:
确定单元, 其在接收到包含目标基站的上行时间提前信息的时间提前命令时, 根 据所述上行时间调整参数和所述目标基站的上行时间提前信息, 确定上行发送时间。
43、 根据权利要求 42所述的 UE, 其中, 所述 UE还包括:
上报单元, 其在接收到目标基站发送的上行资源分配信息后, 在重配完成后, 根 据所述上行资源分配信息在所确定的上行发送时间向所述目标基站反馈重配完成信 息; 其中, 所述时间提前命令通过所述切换命令由所述服务基站发送, 或者通过所述 上行资源分配信息由所述目标基站发送。
44、 根据权利要求 43所述的 UE, 其中, 所述确定单元以所述目标基站的下行定 时信息作为参考, 以提前 NTAnew个抽样点作为上行发送时间; 或者, 所述确定单元 在接收到第一个时间提前命令时, 以所述服务基站的下行定时信息作为参考, 以提前
NTA_new个抽样点作为上行发送时间, 在接收到除第一个时间提前命令以外的时间提 前命令时, 以所述目标基站的下行定时信息作为参考, 以提前 NTAnew个抽样点作为 上行发送时间; 或者, 所述确定单元根据测量得到的下行定时差 Δ ί, 以所述目标基 站的下行定时信息作为参考, 在接收到第一个时间提前命令时, 以提前 NTAnew + A t 个抽样点作为上行发送时间, 在接收到除第一个时间提前命令以外的时间提前命令 时, 以提前 NTA—„^个抽样点作为上行发送时间;
其中, 上行发送时间 NTAnew=NTA―。 ld+TA, 其中, NTA―。 ld为 UE保留的服务基站 的 NTA值, TA为接收到的目标基站的 TA值。
45、 一种基站, 其中, 所述基站包括:
发送单元, 其向 UE发送小区测量请求, 以便 UE根据所述小区测量请求进行小 区测量并上报;
选择单元, 其在接收到所述 UE上报的小区测量结果后, 根据所述小区测量结果 为所述 UE选择目标基站;
控制单元, 其控制所述目标基站检测上行信号以获得目标基站的时间提前信息; 其中, 所述发送单元还用于向所述 UE发送切换命令, 以便所述 UE根据所述切换命 令进行小区切换和重配;
其中, 所述 UE在接收到所述切换命令后, 断开与服务基站的连接并保留服务基 站的上行时间调整参数 NTA
46、 根据权利要求 45所述的方法, 其中, 所述切换命令包含时间提前命令, 所 述时间提前命令包括所述目标基站的上行时间提前信息, 以便所述 UE根据保留的上 行时间调整参数和所述目标基站的上行时间提前信息确定上行发送时间。
47、 一种基站, 其中, 所述基站包括:
检测单元, 其根据 UE的服务基站的控制检测所述 UE的上行信号;
获取单元, 其获取所述 UE相对于本地的上行定时信息;
计算单元, 其根据所述上行定时信息计算本地的上行时间提前量;
处理单元, 其将所述上行时间提前量提供给所述 UE的服务基站。。
48、 根据权利要求 47所述的基站, 其中, 所述计算单元:
以所述 UE的服务基站的下行时钟作为参考,根据所述 UE保留的服务基站的 NTA 值和所述上行定时信息, 计算本地的上行时间提前量; 或者
以本地的下行时钟作为参考, 根据所述 UE保留的服务基站的 NTA值和所述上行 定时信息, 计算本地的上行时间提前量。
49、 根据权利要求 48所述的基站, 其中, 当所述计算单元以本地的下行时钟作 为参考计算本地的上行时间提前量时,所述计算单元通过所述获取单元从所述 UE获 取本地的下行时钟; 或者, 根据接收到的信号时延差确定本地的下行时钟。
50、 根据权利要求 47所述的基站, 其中, 所述基站还包括:
发送单元, 其向所述 UE发送上行资源分配信息, 以便所述 UE根据所述上行资 源分配信息反馈重配完成信息。
51、 根据权利要求 50所述的基站, 其中, 所述上行资源分配信息包含时间提前 命令, 所述时间提前命令包括所述目标基站的上行时间提前量, 以便所述 UE根据保 留的上行时间调整参数和所述目标基站的上行时间提前量确定上行发送时间。
52、 一种通信系统, 其中, 所述通信系统包括权利要求 15-19任一项所述的 UE, 以及权利要求 20-24任一项所述的宏基站, 以及权利要求 25-27任一项所述的目标基 站, 以及权利要求 28所述的服务基站。
53、 一种通信系统, 其中, 所述通信系统包括权利要求 41-44任一项所述的 UE 以及权利要求 45-46任一项所述的服务基站, 以及权利要求 47-51任一项所述的目标 基站。
54、 一种计算机可读程序, 其中当在基站中执行该程序时, 该程序使得计算机在 所述基站中执行权利要求 5-14、 34-40任一项所述的小区切换与重配的方法。
55、一种存储有计算机可读程序的存储介质,其中该计算机可读程序使得计算机 在基站中执行权利要求 5-14、 34-40任一项所述的小区切换与重配的方法。
56、 一种计算机可读程序, 其中当在终端设备中执行该程序时, 该程序使得计算 机在所述终端设备中执行权利要求 1-4、 29-33任一项所述的小区切换与重配的方法。
57、一种存储有计算机可读程序的存储介质,其中该计算机可读程序使得计算机 在终端设备中执行权利要求 1-4、 29-33任一项所述的小区切换与重配的方法。
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US20150223124A1 (en) 2015-08-06
JP6179597B2 (ja) 2017-08-16
US10187829B2 (en) 2019-01-22
KR101689490B1 (ko) 2016-12-23
CN104737584B (zh) 2019-01-11
EP2911449A4 (en) 2016-10-05
EP2911449A1 (en) 2015-08-26
KR20150068985A (ko) 2015-06-22
CN104737584A (zh) 2015-06-24

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