WO2012013090A1 - 支持载波汇聚的通信系统中切换小区的方法、设备和系统 - Google Patents

支持载波汇聚的通信系统中切换小区的方法、设备和系统 Download PDF

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Publication number
WO2012013090A1
WO2012013090A1 PCT/CN2011/075073 CN2011075073W WO2012013090A1 WO 2012013090 A1 WO2012013090 A1 WO 2012013090A1 CN 2011075073 W CN2011075073 W CN 2011075073W WO 2012013090 A1 WO2012013090 A1 WO 2012013090A1
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WIPO (PCT)
Prior art keywords
cell
base station
cells
accessed
terminal
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PCT/CN2011/075073
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English (en)
French (fr)
Inventor
魏宇欣
Original Assignee
索尼公司
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
Priority to CA2805895A priority Critical patent/CA2805895C/en
Priority to KR1020137004917A priority patent/KR101463700B1/ko
Priority to EP11811792.8A priority patent/EP2600653B1/en
Priority to US13/810,472 priority patent/US8831615B2/en
Priority to EP18162574.0A priority patent/EP3361778B1/en
Priority to JP2013518938A priority patent/JP5590235B2/ja
Priority to MX2013000888A priority patent/MX2013000888A/es
Priority to EP22180567.4A priority patent/EP4090074A1/en
Application filed by 索尼公司 filed Critical 索尼公司
Priority to RU2013108440/07A priority patent/RU2534039C2/ru
Priority to AU2011285426A priority patent/AU2011285426B2/en
Priority to BR112013001392-3A priority patent/BR112013001392B1/pt
Priority to KR1020147023984A priority patent/KR101697838B1/ko
Publication of WO2012013090A1 publication Critical patent/WO2012013090A1/zh
Priority to US14/340,163 priority patent/US9439111B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/30Reselection being triggered by specific parameters by measured or perceived connection quality data
    • 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
    • H04W36/0085Hand-off measurements
    • H04W36/0094Definition of hand-off measurement parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • 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
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • 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
    • 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
    • H04W36/00833Handover statistics
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • 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

Definitions

  • the present invention relates to the field of communications supporting carrier aggregation, and in particular to a method and apparatus for performing cell handover in a communication system supporting carrier aggregation, and a terminal, base station and communication system using such a method or including such a device .
  • Background technique
  • the future LTE-A (Long Term Evolution-Advanced) system will support transmission bandwidths up to 100 MHz, while the maximum transmission bandwidth supported in the LTE standard is 20 MHz, so multiple carriers need to be aggregated to achieve higher Transmission bandwidth.
  • Carrier Aggregation is a technology that 3GPP proposes to jointly transmit multiple carriers in order to support the higher transmission bandwidth requirements of future mobile communication systems.
  • the introduction of carrier aggregation technology brings new opportunities and challenges to the development of communication technology.
  • Communication systems that support carrier aggregation can support a variety of carrier aggregation scenarios, such as continuous carrier aggregation and discontinuous carrier aggregation. This results in a diversity of scenes when the terminal in the communication system switches cells. This diversity makes it impossible for a single switching algorithm to adapt to all scenarios.
  • Some embodiments of the present invention propose a scheme for adaptively selecting a cell handover algorithm based on different carrier aggregation scenarios in which the terminal is located during cell handover.
  • some embodiments of the present invention provide methods and apparatus for cell handover in a communication system supporting carrier aggregation, and terminals, base stations, and communication systems that utilize or include such methods.
  • a method for handover of a cell in a communication system supporting carrier aggregation comprising: determining, by a source base station in a communication system, a terminal to be served by the source base station to perform cell handover Selected one or more cells to be accessed that are subordinate to the destination base station Whether the corresponding carrier unit is located in the same frequency band, and if so, encapsulating configuration information of all cells in the one or more to-be-accessed cells in a handover command for initiating cell handover of the terminal; And configuring configuration information of one or more of the one or more to-be-accessed cells in the handover command; and transmitting the handover command.
  • a cell switching device being disposed in a base station in a communication system supporting carrier aggregation, and comprising: command forming means, configured to determine that the base station is Whether the carrier unit corresponding to one or more cells to be accessed belonging to the target base station selected by the terminal to be switched by the serving is located in the same frequency band, and if so, the one or more to be connected
  • the configuration information of all cells in the ingress cell is encapsulated in a handover command for initiating a cell handover of the terminal; otherwise, the configuration information of one or more of the one or more to-be-accessed cells is encapsulated
  • the transmitting device is configured to send the switching command.
  • a base station in a communication system supporting carrier aggregation comprising the above-described cell switching device.
  • a method of handover of a cell in a communication system supporting carrier aggregation includes: when a terminal in a communication system moves to an edge of a current serving cell, select one or more from the one or more neighbor cells according to a carrier aggregation manner of one or more neighbor cells As a measurement object; the terminal measures performance of the measurement object to obtain one or more measurement results; and uses the one or more measurement results as performance measures of the one or more neighbor cells
  • the obituary is sent to the source base station currently serving the terminal.
  • a cell switching device is provided, the device being disposed in a terminal in a communication system supporting carrier aggregation, and comprising: a measurement object selecting device, when the terminal moves to a current serving cell
  • the measurement object selection means is configured to select one or more of the one or more neighbor cells as a measurement object according to a carrier aggregation manner of one or more neighbor cells; And measuring the performance of the measurement object to obtain one or more measurement results; and transmitting means for using the one or more measurement results obtained by the cell measurement device as the one or more neighbors
  • the performance measurement report of the cell is sent to the source base station currently serving the terminal.
  • a terminal in a communication system supporting carrier aggregation comprising the above-described cell switching device.
  • a communication system that supports carrier aggregation.
  • the method of changing the cell includes: after receiving the performance measurement of the one or more neighbor cells sent by the terminal served by the terminal, the source base station in the communication system reports the performance according to the performance measurement, and based on the a carrier aggregation manner of one or more candidate base stations corresponding to one or more neighbor cells, selecting an algorithm adapted to the carrier aggregation mode to calculate a priority of the one or more candidate base stations; from the one Selecting the highest priority one of the plurality of candidate base stations as the target base station; and selecting one or more of the terminals from all of the one or more neighbor cells belonging to the target base station The cells to be accessed.
  • a cell switching device is provided, the device being disposed in a base station in a communication system supporting carrier aggregation, and comprising: receiving means, configured to receive a terminal served by the base station Transmitted performance measurement report for one or more neighbor cells; priority determining means for reporting the performance based on the performance, and based on one or more corresponding to the one or more neighbor cells a carrier aggregation mode of the plurality of candidate base stations, selecting an algorithm adapted to the carrier aggregation mode to calculate a priority of the one or more candidate base stations; and a destination base station selection device, configured to calculate, according to the priority determining device a priority, selecting one of the one or more candidate base stations as the target base station; and cell selecting means for selecting one or more of the terminals from the cells belonging to the target base station The cell to be accessed.
  • a base station in a communication system supporting carrier aggregation comprising the above-described cell switching device.
  • a method for handover of a cell in a communication system supporting carrier aggregation comprising: when a terminal in a communication system moves to an edge of a current serving cell, according to one or a carrier aggregation mode of more neighbor cells, one or more selected from the one or more neighbor cells as a measurement object; the terminal measures performance of the measurement object to obtain one or more measurement results Transmitting the one or more measurement results as performance measures of the one or more neighbor cells to a source base station currently serving the terminal; the source base station transmitting the received terminal After the performance measurement report, according to the performance measurement, and based on a carrier aggregation manner of one or more candidate base stations corresponding to the one or more neighbor cells, selecting to adapt to the carrier aggregation a method of calculating a priority of the one or more candidate base stations; selecting a highest priority from the one or more candidate base stations One as a destination base station; selecting one or more to-be-accessed cells of the terminal from among
  • a communication system that supports carrier aggregation.
  • a method for changing a cell comprising: when a terminal in a communication system moves to an edge of a current serving cell, selecting one of the one or more neighbor cells according to a carrier aggregation manner of one or more neighbor cells Or more as a measurement object; the terminal measures performance of the measurement object to obtain one or more measurement results; and the one or more measurement results as performance of the one or more neighbor cells
  • the measurement 4 is sent to the source base station currently serving the terminal; after receiving the performance measurement report sent by the terminal, the source base station according to the performance measurement 4 reports from the one or more Selecting one of the one or more candidate base stations corresponding to the multiple neighbor cells as the target base station, and selecting one or more of the terminals from all the cells belonging to the target base station from the one or more neighbor cells a plurality of cells to be accessed; if the carrier units corresponding to the one or more cells to be accessed are located in the same frequency band, the one or more
  • a communication system supporting carrier aggregation comprising the above-described terminal and/or base station.
  • embodiments of the present invention also provide a computer program for implementing the above method.
  • embodiments of the present invention also provide a computer program product in the form of at least a computer readable medium having recorded thereon computer program code for implementing the above method.
  • FIG. 1 is a schematic flowchart showing a method of a terminal switching a cell in a communication system according to an embodiment of the present invention
  • FIG. 2 is a schematic flow chart showing a method for a terminal to select a measurement object according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart showing a method for screening a measurement result before a terminal transmits a performance measurement report to a source base station according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart showing a method of screening a measurement result before a terminal transmits a performance measurement report to a source base station according to another embodiment of the present invention
  • FIG. 5 is a schematic flowchart showing a method of a terminal measuring a comparison object for performing measurement result screening according to an embodiment of the present invention
  • FIG. 6 is a schematic flowchart showing a method of a terminal comparing measurement objects for performing screening of measurement results according to another embodiment of the present invention.
  • FIG. 7 is a schematic block diagram showing the structure of a cell switching device according to an embodiment of the present invention.
  • FIG. 8 is a schematic block diagram showing the structure of a cell switching device according to another embodiment of the present invention.
  • FIG. 9 is a schematic flowchart showing a method of performing cell handover by a source base station in a communication system according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart showing a method for a source base station to calculate a priority of a candidate base station according to a performance measurement report sent by a terminal according to an embodiment of the present invention
  • FIG. 11 is a schematic flowchart showing a method for a source base station to select a cell to be accessed according to a carrier aggregation manner of a target base station according to an embodiment of the present invention
  • FIG. 12 is a schematic flowchart showing a method for a source base station to select a primary cell to be accessed according to a carrier aggregation manner of a target base station according to an embodiment of the present invention
  • FIG. 13 is a schematic flowchart showing a method for a source base station to form a handover command according to a carrier aggregation manner of a selected cell to be accessed according to an embodiment of the present invention
  • FIG. 14 is a schematic block diagram showing the structure of a cell switching device provided in a base station of a communication system supporting carrier aggregation, according to an embodiment of the present invention
  • 15 is a schematic flowchart showing a method for a source base station to perform cell handover in a communication system according to an embodiment of the present invention
  • 16 is a schematic block diagram showing the structure of a cell switching device provided in a base station of a communication system supporting carrier aggregation, according to an embodiment of the present invention
  • FIG. 17, FIG. 18, and FIG. 19 respectively show application scenarios of the cell switching algorithm of the above embodiment
  • 20 is a schematic flowchart showing a method of performing cell handover by a source base station in a communication system according to another embodiment of the present invention
  • 21 is an exemplary block diagram showing the structure of a computer for implementing the present invention.
  • a scheme for adaptively selecting a handover algorithm according to different scenarios in which a terminal performs cell handover in a communication system supporting carrier aggregation is provided.
  • the base station to which the current serving cell currently accessed by the terminal belongs is referred to as the source base station (ie, the base station currently serving the terminal), and the base station to which the neighbor cell of the terminal belongs is referred to as the candidate target base station or candidate base station.
  • the base station to which the cell to which the terminal is finally switched is referred to as the target base station.
  • the so-called neighbor cell refers to a cell that is detected in the coverage area adjacent to the current serving cell of the terminal when the terminal moves to the coverage edge of the current serving cell.
  • FIG. 1 shows a method for a terminal to handover a cell in a communication system supporting carrier aggregation according to an embodiment of the present invention.
  • a terminal When a terminal performs cell handover, it needs to first measure the performance of its neighbor cells. At this time, the terminal is at the coverage edge of the current serving cell, and one or more neighbor cells may be detected at the same time. These neighbor cells may be subordinate to different candidate base stations, and these candidate base stations may support various carrier aggregation modes. These neighbor cells exhibit different characteristics in different carrier aggregation modes. In the embodiment shown in Fig. 1, the terminal selects some or all of the neighboring cells in the different carrier aggregation modes to be selected as measurement objects.
  • the method may include step 103, step 109, and step 115.
  • step 103 one or more are selected as measurement objects according to the detected carrier aggregation manner of one or more neighbor cells.
  • the measurement object can be selected according to different characteristics in different carrier aggregation modes of these neighbor cells, instead of simply measuring all neighbor cells.
  • the selection of the measurement object may be performed by the source base station of the terminal, and then the source base station notifies the terminal of the selection result; as another example, the measurement object selection may also be performed by the terminal.
  • step 109 the terminal measures the performance of one or more measurement objects obtained in step 103 to obtain one or more measurement results.
  • step 115 the terminal uses these measurements to form a performance measure for one or more neighbor cells, and transmits a performance measure 4 to the source base station.
  • the terminal may employ any suitable method to measure the performance of a cell (the performance of the cell may be characterized by one or more appropriate performance parameters) as a measurement of the cell.
  • the performance of the cell may be characterized by one or more appropriate performance parameters
  • the description of the specific measurement method and performance parameters is omitted in the present specification, and the measured performance parameters of the cells are collectively referred to as the performance of the cell.
  • FIG. 2 shows another embodiment in accordance with the present invention in which a method for selecting a measurement object from one or more neighbor cells is provided.
  • the carrier units corresponding to each neighbor d and the area belonging to a candidate base station are located in the same frequency band, and therefore the propagation characteristics of these carrier units are similar.
  • one of the neighbor cells subordinate to the candidate base station can be selected as the measurement object, and the measurement result of the measurement object can be used as the measurement result of all the neighbor cells belonging to the candidate base station.
  • step 103-1 it is determined whether carrier components corresponding to neighbor cells belonging to the same base station in one or more neighbor cells are located in the same frequency band. That is to say, it is first determined whether the neighbor cells belonging to the same base station are continuous carrier aggregation modes. If so, in step 103-2, one or several (preferably, one selected) among the neighbor cells belonging to the same base station are selected as measurement objects. If not, in step 103-3, all cells in the neighbor cells belonging to the same base station are taken as measurement objects. Specifically, if only one neighbor cell corresponds to a candidate base station, the neighbor cell is used as a measurement object.
  • the neighbor cells belonging to the candidate base station are all measured objects. If there are multiple neighbor cells corresponding to a candidate base station and the neighbor cells are in the same frequency band, all neighbor cells belonging to the candidate base station are not required to be measured.
  • the steps shown in Figure 2 can be performed by the terminal performing the cell handover or its source base station.
  • the embodiment of FIG. 2 utilizes the spectrum characteristics and propagation characteristics of the cell in the continuous carrier aggregation mode, which reduces the number of neighbor cells that need to be measured, thereby greatly reducing the measurement load of the terminal.
  • other suitable characteristics of neighbor cells in other carrier aggregation scenarios may also be utilized to filter objects for measurement, not enumerated here. It should be understood that the above method of selecting a measurement object can be applied to other embodiments of the cell handover method described above or to be described below.
  • the terminal may also filter the measurements according to some conditions before transmitting the measurement results to the source base station. Only qualified measurement results will be sent to the source base station. This can reduce the number of measurement results that the communication system needs to process, thereby reducing the transmission load of the communication line and the processing load of the source base station.
  • Figures 3-6 illustrate some specific embodiments of the method by which the terminal optimizes the measurement results.
  • the terminal sets the transmission threshold of the measurement result to reduce the number of measurement reports that need to be processed, thereby reducing the transmission load of the communication line and the processing load of the source base station.
  • the terminal determines whether each of the measured one or more measurement results is higher than a threshold, and if so, sends the measurement to the source base station in step 115. As a result, the measurement result is included in the performance measurement report sent to the source base station. If a measurement result is lower than the above threshold, the terminal does not send the measurement result to the source base station, that is, the measurement result is not included in the performance measurement report sent to the source base station.
  • the above-mentioned threshold may be set according to actual needs, for example, according to measured performance parameters or actual communication scenarios, which are not described in detail herein.
  • the threshold may be a value set by the system (or base station) for the terminal or a value determined by the terminal according to the actual application scenario.
  • the above-described threshold may be set in advance in the terminal.
  • the terminal or its source base station specifies the object to be compared for comparison with the measurement result according to the source base station carrier aggregation manner, so that the screening method of the measurement result is adaptive to the actual Communication scenarios, and further optimization of the transmission of measurement reports.
  • the carrier units in the same frequency band generally have similar propagation characteristics. Therefore, when the source base station is in the continuous carrier aggregation mode, one of the cells can be arbitrarily selected as the object to be compared, thereby reducing the measurement of the terminal. Load and process loads to increase processing speed.
  • the source base station is in the discontinuous carrier aggregation mode, since the carrier units of the respective cells are located in different frequency bands, the propagation characteristics of the respective cells are different.
  • step 111 the terminal or the source base station determines whether the carrier units corresponding to all cells of the source base station (or all cells currently accessed by the terminal) are located in different frequency bands.
  • step 112 the terminal compares each measurement result with the performance of all cells of the source base station, or compares each measurement result with a certain threshold (Fig. The embodiment shown in FIG. 3 is similar, and the threshold may also be determined by the system or the base station or the terminal, or determined according to the actual application, and details are not described herein. If a measurement result If the performance of all the cells better than the source base station is higher than the threshold, the measurement result may be sent to the source base station in step 115, otherwise, the measurement result is not sent to the source base station.
  • step 112 the terminal compares each measurement result with any of all cells of the source base station.
  • the performance is compared, or each measurement is compared to a certain threshold (similar to the embodiment shown in Figure 3, which may also be predetermined by the system or base station or terminal or determined according to the actual application) , I won't go into details here.) If a measurement result is better than or higher than the performance of any cell randomly selected in all cells of the source base station, the measurement result is sent to the source base station in step 115, otherwise, the source station is not sent to the source base station. Measurement results.
  • the terminal can use the method of Figure 5 or Figure 6 to compare the measurement results with the performance of the cell of the source base station.
  • a method of comparing the measurement result of the neighbor cell with the performance of all cells of the source base station may include steps 112-1 and 112-2. In the steps
  • the best performing one of all the cells of the source base station (all the cells currently accessed by the terminal and all the cells of the source base station) is used as a comparison object, and the terminal measures the performance of the comparison object.
  • the terminal compares each measurement to the performance of the best performing cell. With the method of FIG. 5, the terminal does not have to compare the measurement result with the performance of each cell of the source base station, thereby reducing the processing load of the terminal and speeding up the processing speed.
  • one of the best performing cells of all cells currently accessed by the terminal may be specified by the source base station (e.g., according to its saved performance data) and notified to the terminal.
  • the terminal may select one cell with the best performance among all the cells currently accessed according to the performance data or historical measurement result saved by the terminal, or may be performed by the terminal for all cells currently accessed by the terminal. Measure and select the one with the best performance as the comparison object.
  • the method of comparing the measurement result of the neighbor cell with the performance of any cell of the source base station may include steps 113-1 and 113-2. In the steps
  • one cell is randomly selected from all cells of the source base station (all cells currently accessed by the terminal) as a comparison object, and the performance of the comparison object is measured.
  • the terminal compares each measurement result with the performance of the selected cell.
  • the terminal only needs to measure the performance of one cell of the source base station, which can reduce the measurement and processing load of the terminal and improve the processing speed.
  • the source base station may randomly designate one of the cells currently accessed by the terminal as a comparison object, and notify the terminal of the comparison object.
  • the terminal may arbitrarily select one of all cells currently accessed by the terminal as a comparison. Object.
  • FIG. 7 and 8 respectively show a cell switching device to which the method in the above embodiment/example is applied.
  • the device 700 or 800 shown in Fig. 7 or Fig. 8 can be placed in a terminal (not shown) of a communication system supporting carrier aggregation.
  • the cell switching device 700 includes: a measurement object selecting means 701, a cell measuring means 702, and a transmitting means 703.
  • the measurement object selection means 701 is configured to select one or more from the neighbor cells according to the detected carrier aggregation mode of the one or more neighbor cells. As a measurement object.
  • the cell measurement device 702 is configured to measure the performance of the selected one or more measurement objects to obtain one or more measurement results.
  • the transmitting device 703 is configured to form a performance measurement of one or more neighbor cells according to the measurement result obtained by the cell measurement device 702, and send the performance measurement report to the source base station currently serving the terminal.
  • device 700 selects measurement objects based on the different characteristics of the detected neighbor cells, rather than simply measuring all neighbor cells. In this way, the number of cells that need to be measured can be reduced, thereby reducing the measurement load of the device (terminal) and increasing the processing speed.
  • the cell switching device 800 includes a measurement object selecting means 801, a cell measuring means 802, and a transmitting means 803. The difference from FIG. 7 is reused, and the cell switching device 800 further includes a judging device 804.
  • the measurement object selection means 801, the cell measurement means 802, and the transmission means 803 are similar in function to the corresponding means 701, 702, 703 shown in Fig. 7, and will not be repeated here.
  • the determining device 804 is configured to determine whether each measurement result obtained by the cell measurement device 801 is higher than a threshold. If yes, the transmitting device 803 is instructed to send the measurement result to the source base station. Otherwise, the transmitting device 803 is instructed not to the source. The base station transmits the measurement result.
  • the cell switching device 800 sets the transmission threshold of the measurement result to reduce the number of measurement reports that need to be processed, thereby reducing the transmission load of the communication line and the processing load of the source base station.
  • the determining device 804 may further be configured according to a carrier aggregation manner of the source base station. Select the object to be compared for comparison with the measurement results. Specifically, the determining device 804 may first determine whether carrier components corresponding to all cells of the source base station are located in different frequency bands. If the carrier units corresponding to all the ds and regions of the source base station are located in different frequency bands, the determining device 804 further determines whether each measurement result obtained by the cell measurement device 802 is better than the performance of all cells of the source base station or whether it is higher than a certain one. The threshold value, if yes, instructs the transmitting device 803 to transmit the measurement result to the source base station; otherwise, the measurement result is not sent to the source base station.
  • the determining device further determines whether each measurement result obtained by the cell measurement device 802 is better than the performance of any cell randomly selected in all cells of the source base station or Whether it is higher than a certain threshold, if yes, the transmitting device 803 is instructed to send the measurement result to the source base station; otherwise, the measurement result is not sent to the source base station. In this way, the screening of the measurement results can be adapted to the actual communication scenario, thereby further optimizing the transmission of the measurement report.
  • arbitrarily selecting one of the cells of the source base station as the object to be compared for measurement can reduce the measurement load and processing load of the terminal, and improve the processing speed.
  • device 800 may employ a method such as that of FIG. 5 or FIG. 6 to achieve a comparison of measurements to performance of a cell of a source base station.
  • cell measurement device 802 can measure the performance of all cells of the source base station and feed back to decision device 804.
  • the determining means 804 selects one of the best performing cells based on the performance of all cells of the source base station obtained by the cell measuring means 802, and compares each measurement result with the performance of the best performing one cell. In this way, the device 800 does not have to compare the measurement result with the performance of each cell of the source base station, thereby reducing the processing load of the device and speeding up the processing.
  • the cell measurement device 802 can measure the performance of one of the cells randomly selected in all cells of the source base station; and the determining device 804 can compare the measurement results of the neighbor cells with the performance of the selected cell.
  • the device 800 only needs to measure the performance of one cell of the source base station, thereby reducing the measurement and processing load and increasing the processing speed.
  • the threshold value described in the foregoing device embodiment/example may be set by the system (or base station) or the terminal according to actual needs, and is not repeated here.
  • the device 700 or 800 may measure the performance of a certain cell by any suitable method, and the performance of the cell may be characterized by any suitable performance parameter, and details are not described herein again.
  • the measurement object selection means 701 / 801 may further determine whether carrier components corresponding to neighbor cells belonging to the same base station in one or more neighbor cells are located in the same frequency band; if yes, select a neighbor from among them The cell is used as the measurement object, otherwise, it will be the subordinate All cells in the neighbor cell of the same base station are used as measurement objects.
  • the example utilizes the frequency characteristics and propagation characteristics of the cell in the continuous carrier aggregation mode, which reduces the number of neighbor cells that need to be measured, thereby greatly reducing the measurement load of the terminal.
  • the measurement object selection means 701/801 may also utilize other suitable characteristics of neighbor cells in other carrier aggregation scenarios to filter objects for measurement, here not - enumerated
  • a terminal in a communication system that supports carrier aggregation is also provided.
  • the terminal may include the cell handover device in the above device embodiment/example, or may utilize the cell handover method in the above method embodiment/example. I won't go into details here.
  • the selection of the measurement object is performed on the terminal side. Selecting the measurement object by the terminal (rather than the source base station) can reduce the overhead required for communication between the terminal and the base station, thereby improving processing speed and efficiency.
  • a base station (not shown) including a cell switching device, the cell switching device of the base station comprising measuring object determining means.
  • the measurement object determining means is configured to select one or more of the one or more neighbor cells as the measurement object according to the carrier aggregation manner of the one or more neighbor cells detected by the terminal served by the base station.
  • a cell handover method performed on a base station side includes: a carrier aggregation manner of one or more neighbor cells detected by a base station according to a terminal served by the base station And selecting one or more of them as measurement objects; and notifying the measurement object to the terminal.
  • the base station eg, using the measurement object determining apparatus
  • the base station first determines whether carrier components corresponding to neighbor cells belonging to the same base station in one or more neighbor cells are located in the same frequency band; if yes, belonging to the same base station One or several (preferably, one) of the neighbor cells are selected as measurement objects, and if not, all cells in the neighbor cells belonging to the same base station are taken as measurement objects.
  • the transmitting device of the base station notifies the terminal of the measurement object.
  • the measurement object determining means may also be incorporated in a cell switching device assigned to the base station side in each of the embodiments/examples to be described hereinafter.
  • the method of selecting a measurement object by the base station can also be incorporated in the flow of the cell handover method by the base station in each of the embodiments/examples to be described hereinafter.
  • a method, a device, and a base station and a communication system including such a device, which perform selection of a target base station and a cell to be accessed on a base station side in a communication system supporting carrier aggregation will be described hereinafter.
  • a terminal accesses only one cell.
  • a terminal may simultaneously access multiple cells before switching cells, and these cells only correspond to one source base station. After the cell handover is performed, the terminal may still access multiple cells at the same time. If the cell to be accessed is selected only according to the performance of the neighbor cell, there is a possibility that the selected cell to be accessed belongs to a different base station.
  • FIG. 9 shows an embodiment in which a base station (referred to as a source base station) in a communication system supporting carrier aggregation is shown to perform a performance measurement report on a neighbor cell of the terminal according to the terminal it serves. A method of selecting a destination base station and a cell to be accessed.
  • a base station referred to as a source base station
  • the method includes steps 903, 908, and 915.
  • the source base station receives a performance measurement report of the neighbor cell of the terminal sent by a terminal that it serves.
  • the performance measurement report may include measurement results of the terminal for one or more of its neighbor nodes. These neighbor nodes may correspond to one or several candidate base stations.
  • the source base station selects different algorithms based on different carrier aggregation modes of different candidate base stations in order to calculate the priority of these candidate base stations.
  • step 909 the source base station selects the one with the highest priority from the candidate base stations as the destination base station based on the calculated priority.
  • the source base station selects one or more of all the cells belonging to the target base station from one or more neighbor cells as the terminal to be accessed.
  • candidate base stations may support different carrier aggregation modes, their neighbor cells may exhibit different characteristics.
  • the source base station adaptively selects the priority calculation algorithm according to the carrier aggregation manner of these neighbor cells. This enables the selection of the destination base station to be more adapted to the actual communication scenario.
  • the method first determines the target base station, and then selects the cell to be accessed from the cells of the target base station, thereby avoiding the situation that the selected cell to be accessed belongs to a different base station.
  • FIG. 10 illustrates a specific embodiment of selecting different priority algorithms based on carrier aggregation scenarios of respective candidate base stations.
  • the method of selecting different priority algorithms according to the carrier aggregation scenario may include steps 903-1, 903-2, and 903-3.
  • the source base station first determines whether the carrier units corresponding to the neighbor cells belonging to the same candidate base station among the one or more neighbor cells involved in the performance measurement report are located in the same frequency band. As mentioned above, these neighbor cells may correspond to one or several candidate base stations.
  • the source base station calculates the priority of the candidate base station according to the performance of all neighbor cells belonging to the candidate base station (if only one neighbor cell corresponds to a candidate base station, according to The performance of the neighbor cell determines the priority of the candidate base station).
  • the source base station may sum the performance of all neighbor cells belonging to the candidate base station according to the measurement result in the performance measurement, or weight the performance of all neighbor cells belonging to the candidate base station, and then sum And determining the priority of the candidate base station based on the calculated value. The higher the calculated value, the higher the priority. It should be understood that the added value may be determined according to the function of each neighboring cell and the actual application scenario, which will not be described in detail herein.
  • step 903-3 the source base station according to the performance measurement report belongs to all neighbor cells belonging to the candidate base station.
  • different priority calculation methods are selected according to the difference between the continuous carrier aggregation scenario and the discontinuous carrier aggregation scenario, thereby obtaining the priority of each candidate base station.
  • the selected target base station may support carrier aggregation. Therefore, the terminal may access multiple cells after switching to the target base station. As an example, all cells of the target base station may be selected as the cell to be accessed of the terminal. As another example, all neighbor cells belonging to the target base station among the one or more neighbor nodes may be used as the terminal to be accessed, or one or more of all neighbor cells belonging to the target base station may be selected as The cell to be accessed of the terminal.
  • Figures 11-12 illustrate other specific examples of selecting a cell to be accessed in different ways depending on different carrier aggregation scenarios.
  • a method of selecting a cell to be accessed from a cell of a target base station may include steps 915-1, 915-2, and 915-3.
  • the source base station determines whether the carrier units corresponding to all the cells belonging to the target base station in the one or more neighbor cells involved in the performance measurement report are located in the same frequency band, that is, determining the carrier aggregation mode of the destination base station. Whether it is non-continuous.
  • the source base station selects one or more neighbor cells that are subordinate to the destination base station. All neighbor cells are used as cells to be accessed. If only one neighbor cell belongs to the target base station, the neighbor cell is selected as the cell to be accessed. [89] If it is determined that the carrier units corresponding to all neighbor cells belonging to the target base station are located in different frequency bands, then in step 915-3, the source base station selects one or more of all neighbor cells belonging to the target base station. , as the cell to be accessed.
  • the source base station may select multiple cells in the same frequency band as the cells to be accessed in all the neighboring cells that belong to the target base station, or the source base station may select the cells in different frequency bands according to actual needs of the terminal. Multiple cells are used as cells to be accessed.
  • the primary access cell refers to a cell that is first accessed when the terminal performs cell handover in the case where there are multiple cells to be accessed.
  • the terminal may first access the primary cell to be accessed.
  • the terminal may access other to-access nodes by means of adding and activating a carrier unit, for example, an RRC connection reconfiguration manner that does not include a mobility control message may be used.
  • the addition of carrier units corresponding to other cells to be accessed is performed, thereby implementing a carrier aggregation transmission mode with a small overhead.
  • FIG. 12 shows an example of selecting a primary to-be-accessed cell according to a carrier aggregation scenario.
  • a method of selecting one primary to-be-accessed cell from a plurality of cells to be accessed includes steps 916-1, 916-2, and 916-3.
  • the source base station determines that the performance measurement report determines whether there is such a cell in the selected one or more to-be-accessed cells: the carrier unit corresponding to the cell and the carrier unit corresponding to the current serving cell of the terminal Located in the same frequency band. If such a cell exists, the cell is selected as the primary to-be-accessed cell in step 916-2. If there is no such cell, the best performing one of all the cells to be accessed may be selected as the primary to-be-accessed cell according to the performance measurement report in step 916-3.
  • the primary to-be-accessed cell whose frequency is consistent with the frequency of the current serving cell of the terminal is selected as much as possible, so that the handover caused by the frequency inconsistency of the cells before and after the handover can be reduced. Overhead, thereby further reducing the time for communication interruption.
  • the access of other cells to be accessed may use a RRC (Radio Source Control) connection reconfiguration method that does not include mobile control information to add a carrier, thereby reducing the overhead.
  • a transmission mode that implements carrier aggregation.
  • RRC connection reconfiguration there are two ways of RRC connection reconfiguration, the first being reconfiguration including mobile control information, that is, handover. The second is reconfiguration that does not contain mobile control information.
  • the switching ie, the first) mode
  • the MAC Media Access Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • the source base station may further select the best performing one in all neighbor cells belonging to the target base station (or in the cell to be accessed selected by the source base station) according to the performance measurement report. The cell to be accessed.
  • FIG. 13 shows a cell handover method according to another embodiment of the present invention.
  • the source base station forms a handover command and sends a handover.
  • the process of the command may include steps 917, 919, 921, and 923.
  • step 917 the source base station determines whether the carrier units corresponding to the selected one or more cells to be accessed are located in the same frequency band. If yes, in step 919, the configuration information of all the cells to be accessed is encapsulated in the handover command for instructing the cell handover of the terminal, otherwise, in step 921, only the configuration information of the primary to-be-accessed cell is configured. Encapsulated in the switching command. Finally, in step 923, the source base station sends the handover command to the destination base station.
  • the source base station will all the cells to be accessed.
  • the information is included in the switch command.
  • the terminal can implement access to all cells to be accessed at one time. That is to say, after switching the cell, the terminal can directly enter the carrier aggregation mode. If the communication mode of the carrier aggregation is used before the terminal handover, the quality of service of the user can be guaranteed, and the difference of the service shield before and after the handover can be reduced.
  • the terminal may first access the primary cell to be accessed. After the access to the primary access cell is completed, the terminal may access other cells to be accessed by using a method of adding a carrier unit, for example, may perform RRC connection reconfiguration without using a mobile control message. Adding a carrier unit corresponding to the incoming cell, thereby implementing a carrier aggregation transmission mode with a small overhead. If the selected primary access cell and the serving cell before the terminal handover correspond to carrier units in the same frequency band, the overhead caused by the frequency inconsistency before and after the handover can be further reduced, thereby further shortening the communication interruption time.
  • the terminal may maintain communication with one of the plurality of cells currently accessed before the handover is completed.
  • a conventional single-carrier communication system (such as an LTE system) uses a hard handover mode when performing cell handover. That is to say, in the process of handover, the terminal first disconnects the communication with the old cell and then accesses the new cell, so that communication interruption will inevitably occur, thereby affecting the quality of service of the user.
  • the advantage of carrier aggregation communication is utilized to preserve communication with one or more old cells before the terminal accesses the new cell. When the terminal is completely connected to the new cell, the communication with the old cell is cut off, which can greatly reduce the communication interruption time, thereby improving the quality of service perceived by the user.
  • FIG. 15 shows a cell handover method in a communication system supporting carrier aggregation according to another embodiment of the present invention.
  • the method is implemented by a source base station in a communication system.
  • the method may include steps 1517, 1519, 1521, and 1523.
  • step 1517 after the source base station selects the target base station and one or more to-be-accessed cells for the terminal to be switched, the source base station determines whether the carrier component corresponding to the selected cell to be accessed is located. Within the same frequency band. If yes, in step 1519, the configuration information of all the cells to be accessed is encapsulated in a handover command for initiating cell handover of the terminal; otherwise, only some cells in the cell to be accessed are in step 1521 ( The configuration information such as one cell or several cells is encapsulated in the handover command. Finally in step 1523, the switching command is sent.
  • the access of all the cells to be accessed can be implemented at one time, so that the terminal can directly enter the carrier aggregation mode after switching the cell.
  • the communication mode of the carrier aggregation is used before the handover of the terminal, the quality of service of the user can be guaranteed, and the difference in quality of service before and after the handover can be reduced.
  • FIG. 20 shows a cell handover method in a communication system supporting carrier aggregation according to another embodiment of the present invention.
  • the method is similar to the embodiment shown in FIG. 15, except that the method shown in FIG. 20 may further include a primary to-be-accessed cell selection step 2016.
  • the method can include steps 2016, 2017, 2019, 2021, and 2023.
  • Steps 2017, 2019, 2021, and 2023 are similar to steps 1517, 1519, 1521, and 1523 shown in Fig. 15, respectively, and will not be described again.
  • the source base station may select one of the selected one or more to-be-accessed cells as the primary to-be-accessed cell.
  • the source base station may encapsulate only the configuration information of the primary to-be-accessed cell in the handover command in step 2021. It should be understood that the method of the various embodiments/examples above may be used to select the primary to-be-accessed cell, and is not repeated here.
  • the method shown in FIG. 15 or 20 may further include the step of the source base station selecting the target base station and the cell to be accessed, such as steps 2009 and 2015 shown in FIG.
  • the source base station selects the target base station among the candidate base stations corresponding to the neighbor cell of the terminal according to the performance measurement report sent by the terminal, and selects one or more to be selected in the cell of the target base station. Access to the cell.
  • the source base station can employ any suitable method.
  • the method in the embodiment/example described above with reference to FIGS. 9-13 may be used to select the target base station and the cell to be accessed, and the description is not repeated here.
  • Figures 14 and 16 illustrate an embodiment/example of a device for cell handover in a carrier aggregation scenario, respectively.
  • the device shown in Fig. 14 or 16 is placed in a base station in a communication system supporting carrier aggregation.
  • the device shown by the dashed box in the figure is optional.
  • the cell switching device 1400 may include a receiving device 1401, a priority determining device 1402, a destination base station selecting device 1403, and a cell selecting device 1404.
  • the receiving device 1400 is configured to receive a performance measurement report for one or more neighbor cells sent by the terminal served by the base station.
  • the priority determining means 1402 is configured to select a different algorithm to calculate the priority of each candidate base station based on the performance measurement report and based on a carrier aggregation mode of one or more candidate base stations corresponding to one or more neighbor cells.
  • the destination base station selecting means 1403 can be configured to select the highest priority one of the candidate base stations as the destination base station based on the priority calculated by the priority determining means 1402.
  • the cell selection means 1404 is for selecting one or more cells to be accessed of the terminal among the cells belonging to the target base station.
  • candidate base stations may support different carrier aggregation modes, their neighbor cells may exhibit different characteristics.
  • the device of the source base station adaptively selects different priority calculation algorithms according to the carrier aggregation manner of these neighbor cells. This enables the selection of the destination base station to be more adapted to the actual communication scenario.
  • the device first determines the target base station, and then selects the cell to be accessed from the cells of the target base station, thereby avoiding the situation that the selected cell to be accessed belongs to different base stations.
  • the priority determining means 1402 may first determine whether the candidate base station is in a continuous carrier aggregation mode, and then select an algorithm suitable for the continuous and non-continuous carrier aggregation modes, respectively. Specifically, the priority determining means 1402 can determine whether the carrier units corresponding to the neighbor cells belonging to the same candidate base station in one or more neighbor cells are located in the same frequency band.
  • the priority determining means 1402 may calculate the priority of the candidate base station according to the performance of all neighbor cells belonging to the candidate base station. Level (If only one neighbor cell corresponds to a candidate base station, the priority of the candidate base station is determined according to the performance of the neighbor cell). As an example, the performance of all neighbor cells belonging to the candidate base station may be summed according to the measurement result in the performance measurement report, or the performance of all neighbor cells that will belong to the candidate base station The weighting can be summed and then summed, and the priority of the candidate base station is determined based on the calculated value. The higher the calculated value, the higher the priority. Similar to the foregoing method embodiment/example, the weighting value may be determined according to the function of each neighboring cell and the actual application scenario, and is not repeated here.
  • the priority determining means 1402 may perform best according to all neighbor cells belonging to the candidate base station in the performance measurement report. The performance of one to determine the priority of the candidate base station. The better the performance of the best performing one neighbor cell, the higher the priority of the candidate base station.
  • the cell selection device 1404 may further select one or more of all neighbor cells belonging to the target base station among one or more neighbor cells involved in the performance measurement report as the to-be-accessed Community.
  • the cell selection means 1404 may use all of the neighbor cells belonging to the target base station among the one or more neighbor cells involved in the performance measurement report as the cell to be accessed of the terminal.
  • the cell selection device 1404 may also select one or more cells to be accessed as terminals of all cells of the target base station.
  • the cell selection apparatus may also adopt the method described above with reference to FIG. 11-12 to select a cell to be accessed in different manner according to different carrier aggregation scenarios, so that the selected to be accessed is selected. The cell is more adapted to the actual carrier aggregation scenario.
  • the cell selection device 1404 may first determine whether the carrier units corresponding to all neighbor cells belonging to the target base station in the one or more neighbor cells involved in the performance measurement report are located in the same frequency band, if And selecting all neighbor cells that belong to the target base station as the to-be-accessed cell; otherwise, selecting one or more of the neighboring cells subordinate to the target base station as the to-be-accessed cell. If only one neighbor cell belongs to the target base station, the neighbor cell is selected as the cell to be accessed.
  • the cell selection means 1404 may also select one of the selected cells to be accessed as the primary to-be-accessed cell. For example, the cell selection device 1404 may determine whether there is a cell in the selected one or more to-be-accessed cells in which the corresponding carrier unit is located in the same frequency band as the carrier unit corresponding to the current serving cell of the terminal, and if so, Then, the cell is selected as the primary to-be-accessed cell. Otherwise, the best performing one is selected as the primary to-be-accessed cell among all the neighboring cells that belong to the target base station according to the performance measurement report.
  • the cell selection device 1404 may select the one with the best performance as the primary to-be-accessed cell among all the neighbor cells belonging to the target base station.
  • the cell selection means 1404 can select the primary cell to be accessed using the method described in the method embodiment/example above, and will not be repeated here.
  • device 1400 can also include command forming device 1405 and transmitting device 1406.
  • the command forming means 1405 can form a switching command using the method shown in FIG.
  • the command forming apparatus 1405 may determine whether the selected carrier unit corresponding to the cell to be accessed is located in the same frequency band, and if yes, encapsulate configuration information of all to-be-accessed cells in the handover command; The configuration information of the primary to-be-accessed cell is encapsulated in a handover command.
  • the transmitting device 1406 is configured to send the handover command to the target base station.
  • the terminal in a case where the number of selected cells to be accessed is greater than 1 and the cells to be accessed are located in the same frequency band, the terminal can implement access to all cells to be accessed at one time. That is to say, after switching the cell, the terminal can directly enter the carrier aggregation mode.
  • the terminal may first access the primary cell to be accessed. After the access to the primary access cell is completed, the terminal may access other cells to be accessed by using a method of adding a carrier unit, for example, may perform RRC connection reconfiguration without using a mobile control message.
  • the addition of the carrier unit corresponding to the incoming cell enables the carrier aggregation transmission mode to be implemented with a small overhead.
  • the terminal maintains communication with one of the plurality of cells currently accessed before switching to the destination base station.
  • an active base station e.g., transmitting device 1406
  • this can greatly reduce the time for communication interruption, thereby improving the quality of service perceived by the user.
  • device 1600 can implement the method illustrated in FIG.
  • device 1600 can include command forming device 1605 and transmitting device 1606.
  • the command forming device 1605 is configured to determine whether a carrier unit corresponding to one or more cells to be accessed belonging to the target base station selected by the terminal for which the base station is to be served by the base station is located in the same frequency band If yes, the configuration information of all the cells to be accessed is encapsulated in a handover command for initiating cell handover of the terminal; otherwise, some cells (one or several cells) in the to-be-accessed cell are The configuration information is encapsulated in the switching command.
  • the transmitting device 1606 is configured to send the handover command to the target base station.
  • the terminal performing cell handover can simultaneously access all the cells to be accessed, so that the terminal can Directly enter carrier aggregation mode.
  • the communication mode of the carrier aggregation is used before the terminal handover, the quality of service of the user can be guaranteed, and the difference in quality of service before and after the handover can be reduced.
  • the cell switching device 1600 may further include a primary cell selection device 1607, And selecting one of the selected one or more to-be-accessed cells as the primary access cell.
  • the command forming means can encapsulate only the configuration information of the primary handover cell in the command when forming the handover command.
  • the terminal may first access the primary cell to be accessed. After the access to the primary to-be-accessed cell is completed, the terminal may access other cells to be accessed by adding and activating a carrier unit, for example, by using an RRC connection reconfiguration that does not include a mobile control message. The addition of the carrier unit corresponding to the access cell enables the carrier aggregation transmission mode to be implemented with a small overhead.
  • the primary cell selecting means 1607 may select the one with the best performance among the selected cells to be accessed as the primary to-be-accessed cell according to the performance measurement report.
  • the primary cell selection device 1607 may further select a primary to-be-accessed cell according to the selected carrier of the to-be-accessed cell. Specifically, the primary cell selection device 1607 may determine, in the selected cell to be accessed, whether a cell in which the corresponding carrier unit is located in the same frequency band as the carrier unit corresponding to the current serving cell of the terminal, and if so, select the The cell is used as the primary cell to be accessed. Otherwise, the best one of all neighbor cells belonging to the target base station is selected as the primary cell to be accessed. However, when the selected primary access cell and the current serving cell of the terminal are located in the same frequency band, the switching overhead caused by the cell frequency inconsistency before and after the handover may be reduced, thereby further reducing the communication interruption time.
  • the cell switching device 1600 may further include a receiving device 1601, a destination base station selecting device 1603, and a cell selecting device 1604.
  • the receiving device 1601 is configured to receive a performance measurement report for one or more neighbor cells transmitted by a terminal served by the base station.
  • the destination base station selecting means 1603 is configured to select one of the one or more candidate base stations corresponding to one or more neighbor cells as the target base station according to the performance measurement report.
  • the destination base station selection means 1603 can select the destination base station by using the method described in the above embodiment/example or other suitable method.
  • the destination base station selection means 1603 can be similar to the apparatus 1403 shown in Fig. 14, and will not be repeated here.
  • the cell selection means 1604 is for selecting one or more cells to be accessed of the terminal among all neighbor cells belonging to the target base station.
  • the cell selection means 1604 can select the cell to be accessed using the method shown in the above embodiment/example.
  • the cell selection device 1604 may determine that the carrier units corresponding to all the neighbor cells belonging to the target base station are located in the same frequency band, and if yes, select all neighbor cells that belong to the target base station as the to-be-accessed cell, 'J , one or more of all neighbor cells subordinate to the target base station are selected as cells to be accessed.
  • the device 1600 may further include a priority determining device 1402 in the embodiment as described with reference to FIG. 14, the function of which may be the same as the above-described embodiment/example, and is not repeated here.
  • some embodiments provide a procedure for performing cell handover cell handover in a carrier aggregation scenario. It is not repeated here.
  • a communication system including terminals and/or base stations in the above/below embodiments/examples is also provided.
  • FIG. 17, FIG. 18, and FIG. 19 respectively illustrate application scenarios in which the cell handover algorithm of the above embodiment can be applied.
  • A01-A03, B01-B03, and C01-A03 respectively indicate base stations.
  • the cell coverage corresponding to the carrier unit F A1 and the carrier F A2 in FIG. 17 substantially coincides, and a similar coverage area can be provided.
  • F A1 and F A2 are located in the same carrier frequency band and are a typical continuous carrier aggregation mode.
  • 18 and 19 correspond to a discontinuous carrier aggregation scenario, respectively? ⁇ And? ⁇ Located in different carrier frequency bands, F C1 and F C2 are also located in different carrier frequency bands.
  • the cell corresponding to F B1 or F C1 mainly guarantees coverage, and the cell corresponding to F B2 or F C2 is mainly used to improve throughput.
  • the difference between FIG. 18 and FIG. 19 is that the cell antenna corresponding to F C2 in FIG. 19 points to the edge region in the cell corresponding to F C1 , so that the application scenario of FIG. 19 can greatly improve the throughput of the F C1 cell edge region.
  • the process of performing a cell handover may include a preparation phase, an execution phase, and a completion phase.
  • the differences in the application scenarios result in different handover policies.
  • the following is an example of the process of performing cell handover in these three typical application scenarios.
  • the terminal When the terminal is located at the coverage edge of the current serving cell, all neighbor cells are required (one carrier frequency corresponds to one neighbor cell, and if neighbor cells belonging to the same base station are located in the same frequency band, only need to select one of them) A neighbor cell measurement can be taken to measure.
  • the measurement result of the terminal on the cell corresponding to F A1 is M fl
  • the measurement result on the cell corresponding to F A2 is M /2
  • the measurement result of one of the neighbor cells is M f . Then, the terminal transmits the measurement result to the base station as long as one of the following conditions is satisfied.
  • the terminal transmits the measurement result to the base station.
  • the neighbor cell can be used as a candidate access cell.
  • the base station or the terminal may randomly designate one of the cells accessed by the terminal as the object to be compared, and compare with the measurement result of the neighboring cell.
  • the destination base station and the access cell are to be determined. Since the carrier frequencies corresponding to the candidate cells belonging to the same base station are located in the same frequency band, the selection priority of the base station is determined by the weighting performance of the candidate cells. The base station with the highest priority is selected as the destination base station. Since the carrier frequencies corresponding to the candidate cells belonging to the target base station are located in the same frequency band, all candidate cells serve as access cells. It is assumed here that the cell corresponding to F A1 and F A2 in the base station A02 is regarded as the cell to be accessed.
  • the terminal accesses multiple cells at the same time before the handover, and the number of selected cells to be accessed is multiple, and the carrier units corresponding to the cells to be accessed are located in the same frequency band.
  • the source base station transmits information of all the cells to be accessed to the target base station.
  • the target base station After performing the access control evaluation according to the received information, the target base station sends an ACK message to the source base station if access is allowed.
  • the source base station After receiving the ACK message, the source base station sends an RRC connection reconfiguration message including mobility control information, thereby initiating RRC connection reconfiguration for all cells to be accessed.
  • the terminal chooses to disconnect the original one or more cells, but at least one original cell should keep the communication, and initiate a synchronization request to all the cells to be accessed of the target base station, and synchronize to the new one. Community.
  • Preparation phase When the terminal is located at the cell edge, it is necessary to measure all neighbor cells (one carrier frequency corresponds to one neighbor cell). At this time, ⁇ sets the terminal corresponding to F B The measurement result on the cell is that the measurement result of M /l 5 on the cell corresponding to F B2 is M /2 , and the measurement result for a neighbor cell is M f . The terminal sends a measurement result measuring the neighbor cell to the base station as long as one of the following conditions is met:
  • the terminal will send a measurement report to the base station as long as the measurement result of the neighbor cell is higher than a certain threshold ( ) or better than the measurement result of any cell in which the terminal is located.
  • the neighbor cell can serve as a handover candidate cell.
  • the base station or the terminal may randomly designate one cell in the cell accessed by the terminal as the object to be compared, and compare the measurement result with the neighbor cell.
  • the destination base station and the access cell are to be determined. Specifically, the selection priority of the candidate base station is determined according to whether the carrier frequency corresponding to the candidate cell belonging to the same base station is located in the same frequency band, and finally the base station having the highest priority is selected as the target base station.
  • the access cell is determined according to the relationship between the number of candidate cells belonging to the target base station and whether it is located in the same frequency band and the carrier frequency before handover. It is assumed here that the cell corresponding to F B1 and F B2 in the base station B03 is used as an access cell.
  • the destination base station After the destination base station performs the access control evaluation, if the access is allowed, the ACK message is sent to the source base station.
  • the source base station After receiving the ACK message, the source base station sends an RRC connection reconfiguration message including mobility control information, thereby initiating RRC connection reconfiguration of the primary to-be-accessed cell.
  • the terminal disconnects from the original cell, and initiates a synchronization request to the primary access cell of the target base station, and synchronizes to the new primary access cell.
  • the terminal initiates an RRC connection reconfiguration message that does not include the mobility control information, thereby adding the carrier unit F B2 and accessing the cell corresponding to the F B2 to implement carrier aggregation.
  • the terminal When the terminal is located at the cell edge, it is necessary to measure all neighbor cells (one carrier frequency corresponds to one neighbor cell). At this time, the measurement result of the ⁇ terminal on the cell corresponding to F C1 is M FL , the measurement result on the cell corresponding to F C2 is M /2 , and the measurement result of the neighbor cell is ⁇ / ⁇ as long as the following conditions are met In one case, the terminal will send a measurement report to the base station.
  • the terminal will send a measurement report to the base station as long as the measurement result of the neighbor cell is higher than a certain threshold ( ) or better than the measurement results of all the cells in which the terminal is located.
  • the neighbor cell is a handover candidate cell.
  • the base station or the terminal selects the cell with the best measurement result as the object to be compared, and compares it with the measurement result of the neighbor cell.
  • This phase determines the destination base station and the access cell. Specifically, the selection priority of the candidate base station is determined according to whether the carrier frequency corresponding to the candidate cell belonging to the same base station is located in the same frequency band, and finally the base station having the highest priority is selected as the target base station.
  • the access cell is determined according to the relationship between the number of candidate cells belonging to the target base station and whether it is located in the same frequency band and the carrier frequency before handover. It is assumed here that the cell corresponding to F C1 and F C2 in the base station C03 is regarded as the cell to be accessed.
  • the terminal accesses multiple cells simultaneously before the handover.
  • the number of selected cells to be accessed is multiple, and the carrier frequencies corresponding to the access cells are located in different frequency bands.
  • the source base station sends information of all the cells to be accessed to the destination base station.
  • the source base station After receiving the ACK message, the source base station sends an RRC connection including mobility control information. The message is reconfigured, thereby initiating RRC connection reconfiguration for all cells to be accessed.
  • the terminal chooses to disconnect the original one or more cells, but at least one original cell should keep the communication, and initiate a synchronization request to all the cells to be accessed of the target base station, and synchronize to the new one. Community.
  • each step of the above method and each component module and/or unit of the above device may be implemented as software, firmware, hardware or a combination thereof in a base station or terminal of a communication network, and as the base station or terminal Part of the device.
  • the specific means or manners that can be used in the configuration of the various components and units of the above-mentioned devices in the manner of software, firmware, hardware or a combination thereof are well known to those skilled in the art and will not be described herein.
  • the above method and/or apparatus according to the present invention may be implemented in a device of an existing base station or terminal, wherein certain modifications may be made to the components of the existing base station or terminal.
  • software constituting the above method may be installed from a storage medium or a network to a computer having a dedicated hardware structure (for example, the general-purpose computer 2100 shown in FIG. 21).
  • Program the computer can perform various functions and the like when various programs are installed.
  • the central processing unit (CPU) 2101 executes various processes in accordance with a program stored in the read only memory (ROM) 2102 or a program loaded from the storage portion 2108 to the random access memory (RAM) 2103.
  • ROM read only memory
  • RAM random access memory
  • data required when the CPU 2101 performs various processes and the like is also stored as needed.
  • the CPU 2101, the ROM 2102, and the RAM 2103 are connected to each other via a bus 2104.
  • Input/output interface 2105 is also coupled to bus 2104.
  • an input/output interface 2105 an input portion 2106 (including a keyboard, a mouse, etc.), an output portion 2107 (including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and A speaker, etc.), a storage portion 2108 (including a hard disk or the like), a communication portion 2109 (including a network interface card such as a LAN card, a modem, etc.).
  • the communication section 2109 performs communication processing via a network such as the Internet.
  • the driver 2110 can also be linked to the input/output interface 2105 as needed.
  • a removable medium 2111 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory or the like is mounted on the drive 2110 as needed, so that the computer program read therefrom The sequence is installed into the storage section 2108 as needed.
  • a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 2111.
  • such a storage medium is not limited to the removable medium 2111 shown in FIG. 21 in which a program is stored and distributed separately from the device to provide a program to the user.
  • the removable medium 2111 include a magnetic disk (including a floppy disk (registered trademark):), an optical disk (including a compact disk read only memory (CD-ROM) and a digital versatile disk (DVD)), and a magneto-optical disk (including a mini disk (MD) (registered) The trademark and the semiconductor memory.
  • the storage medium shield may be a ROM 2102, a hard disk included in the storage portion 2108, or the like, in which programs are stored, and distributed to the user together with the device containing them.
  • the present invention also proposes a program product for storing an instruction code readable by a machine.
  • the instruction code is read and executed by a machine, the above-described method according to an embodiment of the present invention can be performed.
  • a storage medium for carrying a program product storing the above-described storage machine readable instruction code is also included in the disclosure of the present invention.
  • the storage barrier includes, but is not limited to, a floppy disk, an optical disk, a magneto-optical disk, a memory card, a memory stick, and the like.
  • the method of the present invention is not limited to being performed in the chronological order described in the specification, and may be performed in other chronological order, in parallel, or independently. Therefore, the order of execution of the methods described in the present specification does not limit the technical scope of the present invention.

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Description

支持载波汇聚的通信系统中切换小区的方法、 设备和系统
技术领域
[01] 本发明涉及支持载波汇聚的通信领域,具体地, 涉及在支持载波汇聚 的通信系统中进行小区切换的方法和设备、以及使用这样的方法或包括这 样的设备的终端、 基站和通信系统。 背景技术
[02] 未来的 LTE-A ( Long Term Evolution -Advanced ) 系统将支持高达 100MHz的传输带宽,而在 LTE标准中可支持的最大传输带宽为 20MHz, 因此需要将多个载波进行汇聚以实现更高的传输带宽。载波汇聚(Carrier Aggregation )就是 3GPP为了支持未来的移动通信系统更高的传输带宽 需求而提出的将多个载波聚合进行联合传输的技术。载波汇聚技术的引入 为通信技术的发展带来了新的机遇和挑战。
发明内容
[03] 支持载波汇聚的通信系统(例如 LTE-A )可以支持各种载波汇聚场 景,例如连续性载波汇聚和非连续性载波汇聚。这导致了通信系统中的终 端在切换小区时场景的多样性。这种多样性使得单一的切换算法不可能适 应于所有的场景。本发明的一些实施例提出了基于小区切换时终端所处于 的不同载波汇聚场景来自适应选择小区切换算法的方案。具体地,本发明 的一些实施例提供了在支持载波汇聚的通信系统中进行小区切换的方法 和设备、 以及利用这些方法或包括这样的设备的终端、 基站和通信系统。
[04] 下文中给出关于本发明一些方面的简要概述,以便提供关于本发明的 基本理解。 应当理解, 这个概述并不是关于本发明的穷举性概述。 它并不 是意图确定本发明的关键或重要部分,也不是意图限定本发明的范围。其 目的仅仅是以简化的形式给出某些概念,以此作为稍后论述的更详细描述 的前序。
[05] 根据本发明的一个方面,提供了一种在支持载波汇聚的通信系统中切 换小区的方法, 该方法包括: 通信系统中的源基站判断为其所服务的、要 进行小区切换的终端选择的从属于目的基站的一个或更多个待接入小区 所对应的载波单元是否位于同一频带内,若是, 则将所述一个或更多个待 接入小区中的所有小区的配置信息封装于用于发起所述终端的小区切换 的切换命令中; 否则,将所述一个或更多个待接入小区中的一个或更多个 的配置信息封装于所述切换命令中; 以及发送所述切换命令。
[06] 根据本发明的另一方面,提供了一种小区切换设备,该设备设置于支 持载波汇聚的通信系统中的基站中, 并包括: 命令形成装置, 用于确定所 述基站为其所服务的、要进行小区切换的终端选择的、从属于目的基站的 一个或更多个待接入小区所对应的载波单元是否位于同一频带内, 若是, 则将所述一个或更多个待接入小区中的所有小区的配置信息封装于用于 发起所述终端的小区切换的切换命令中; 否则,将所述一个或更多个待接 入小区中的一个或更多个的配置信息封装于所述切换命令中;以及发送装 置, 用于发送所述切换命令。
[07] 根据本发明的又一方面,还提供了一种支持载波汇聚的通信系统中的 基站, 该基站包括上述小区切换设备。
[08] 根据本发明的又一个方面,还提供了一种在支持载波汇聚的通信系统 中切换小区的方法。该方法包括: 当通信系统中的终端移动至当前服务小 区的边缘时,才艮据一个或更多个邻居小区的载波汇聚方式,从所述一个或 更多个邻居小区中选择一个或更多个作为测量对象;所述终端测量所述测 量对象的性能,得到一个或更多个测量结果; 及将所述一个或更多个测量 结果作为所述一个或更多个邻居小区的性能测量才艮告发送给当前服务于 所述终端的源基站。
[09] 根据本发明的另一方面,提供了一种小区切换设备,该设备设置于支 持载波汇聚的通信系统中的终端中, 并包括: 测量对象选择装置, 当该终 端移动至当前服务小区的边缘时,该测量对象选择装置用于根据一个或更 多个邻居小区的载波汇聚方式,从所述一个或更多个邻居小区中选择一个 或更多个作为测量对象; 小区测量装置, 用于测量所述测量对象的性能, 得到一个或更多个测量结果; 以及发送装置, 用于将所述小区测量装置得 到的所述一个或更多个测量结果作为所述一个或更多个邻居小区的性能 测量报告发送给当前服务于所述终端的源基站。
[10] 根据本发明的又一方面,还提供了一种支持载波汇聚的通信系统中的 终端, 该终端包括上述小区切换设备。
[11] 根据本发明的另一方面,提供了一种在支持载波汇聚的通信系统中切 换小区的方法。该方法包括: 通信系统中的源基站在收到其所服务的终端 发送的对一个或更多个邻居小区的性能测量寺艮告后,根据所述性能测量才艮 告,并基于与所述一个或更多个邻居小区对应的一个或更多个候选基站的 载波汇聚方式,选择适应于所述载波汇聚方式的算法来计算所述一个或更 多个候选基站的优先级;从所述一个或更多个候选基站中选择优先级最高 的一个,作为目的基站; 及从所述一个或更多个邻居小区中的从属于所述 目的基站的所有小区中选择所述终端的一个或更多个待接入小区。
[12] 根据本发明的另一方面,提供了一种小区切换设备,该设备设置于支 持载波汇聚的通信系统中的基站中, 并包括: 接收装置, 用于接收所述基 站所服务的终端发送的对一个或更多个邻居小区的性能测量报告;优先级 确定装置, 用于才艮据所述性能测量 4艮告, 并基于与所述一个或更多个邻居 小区对应的一个或更多个候选基站的载波汇聚方式,选择适应于所述载波 汇聚方式的算法来计算所述一个或更多个候选基站的优先级; 目的基站选 择装置, 用于根据优先级确定装置计算的所述优先级,选择所述一个或更 多个候选基站中优先级最高的一个作为目的基站; 以及小区选择装置, 用 于在从属于所述目的基站的小区中选择所述终端的一个或更多个待接入 小区。
[13] 根据本发明的又一方面,还提供了一种支持载波汇聚的通信系统中的 基站, 该基站包括上述小区切换设备。
[14] 根据本发明的又一方面,提供了一种在支持载波汇聚的通信系统中切 换小区的方法,该方法包括: 当通信系统中的终端移动至当前服务小区的 边缘时,根据一个或更多个邻居小区的载波汇聚方式,从所述一个或更多 个邻居小区中选择一个或更多个作为测量对象;所述终端测量所述测量对 象的性能,得到一个或更多个测量结果; 将所述一个或更多个测量结果作 为所述一个或更多个邻居小区的性能测量 4艮告发送给当前服务于所述终 端的源基站; 所述源基站在收到所述终端发送的所述性能测量报告后,根 据所述性能测量 4艮告,并基于与所述一个或更多个邻居小区对应的一个或 更多个候选基站的载波汇聚方式,选择适应于所述载波汇聚方式的算法来 计算所述一个或更多个候选基站的优先级;从所述一个或更多个候选基站 中选择优先级最高的一个,作为目的基站; 从所述一个或更多个邻居小区 中从属于所述目的基站的所有小区中选择所述终端的一个或更多个待接 入小区; 以及向所述终端发送用于发起所述终端的小区切换的切换命令。
[15] 根据本发明的又一方面,提供了一种在支持载波汇聚的通信系统中切 换小区的方法,该方法包括: 当通信系统中的终端移动至当前服务小区的 边缘时,根据一个或更多个邻居小区的载波汇聚方式,从所述一个或更多 个邻居小区中选择一个或更多个作为测量对象;所述终端测量所述测量对 象的性能,得到一个或更多个测量结果; 将所述一个或更多个测量结果作 为所述一个或更多个邻居小区的性能测量 4艮告发送给当前服务于所述终 端的源基站; 所述源基站在收到所述终端发送的所述性能测量报告后,根 据所述性能测量 4艮告从与所述一个或更多个邻居小区对应的一个或更多 个候选基站中选择一个作为目的基站,并从所述一个或更多个邻居小区中 从属于所述目的基站的所有小区中选择所述终端的一个或更多个待接入 小区; 若所述一个或更多个待接入小区所对应的载波单元位于同一频带 内,则将所述一个或更多个待接入小区中的所有小区的配置信息封装于用 于发起所述终端的小区切换的切换命令中; 否则,将所述一个或更多个待 接入小区中的一个或更多个的配置信息封装于所述切换命令中;以及发送 所述切换命令。
[16] 根据本发明的又一方面,提供了一种支持载波汇聚的通信系统,该通 信系统包括上述的终端和 /或基站。
[17] 另外, 本发明的实施例还提供了用于实现上述方法的计算机程序。
[18] 此夕卜,本发明的实施例还提供了至少计算机可读介质形式的计算机程 序产品, 其上记录有用于实现上述方法的计算机程序代码。
附图说明
[19] 参照下面结合附图对本发明实施例的说明,会更加容易地理解本发明 的以上和其它目的、特点和优点。 附图中的部件只是为了示出本发明的原 理。在附图中,相同的或类似的技术特征或部件将釆用相同或类似的附图 标记来表示。
[20] 图 1是示出了根据本发明的一个实施例、通信系统中的终端切换小区 的方法的示意性流程图;
[21] 图 2是示出了根据本发明的一个实施例、终端选择测量对象的方法的 示意性流程图;
[22] 图 3是示出了根据本发明的一个实施例、终端在向源基站发送性能测 量报告之前筛选测量结果的方法的示意性流程图; [23] 图 4是示出了根据本发明的另一实施例、终端在向源基站发送性能测 量报告之前筛选测量结果的方法的示意性流程图;
[24] 图 5是示出了根据本发明的一个实施例、终端测量用于进行测量结果 筛选的比较对象的方法的示意性流程图;
[25] 图 6是示出了根据本发明的另一实施例、终端测量用于进行测量结果 的筛选的比较对象的方法的示意性流程图;
[26] 图 7是示出了根据本发明的一个实施例的小区切换设备的结构的示 意性框图;
[27] 图 8是示出了根据本发明的另一实施例的小区切换设备的结构的示 意性框图;
[28] 图 9是示出了根据本发明的一个实施例、通信系统中的源基站进行小 区切换的方法的示意性流程图;
[29] 图 10是示出了根据本发明的一个实施例、 源基站根据终端发送的性 能测量报告来计算候选基站的优先级的方法的示意性流程图;
[30] 图 11是示出了根据本发明的一个实施例、 源基站根据目的基站的载 波汇聚方式来选择待接入小区的方法的示意性流程图;
[31] 图 12是示出了根据本发明的一个实施例、 源基站根据目的基站的载 波汇聚方式来选择主待接入小区的方法的示意性流程图;
[32] 图 13是示出了根据本发明的一个实施例、 源基站根据所选待接入小 区的载波汇聚方式来形成切换命令的方法的示意性流程图;
[33] 图 14是示出了根据本发明的实施例的、 设置于支持载波汇聚的通信 系统的基站中的小区切换设备的结构的示意性框图;
[34] 图 15是示出了根据本发明的一个实施例、 通信系统中的源基站进行 小区切换的方法的示意性流程图;
[35] 图 16是示出了根据本发明的实施例的、 设置于支持载波汇聚的通信 系统的基站中的小区切换设备的结构的示意性框图;
[36] 图 17、 图 18、 图 19分别示出了上述实施例的小区切换算法的应用场 景;
[37] 图 20是示出了根据本发明的另一实施例、 通信系统中的源基站进行 小区切换的方法的示意性流程图; 以及 图 21是示出用于实现本发明的计算机的结构的示例性框图。
具体实施方式
[39] 下面参照附图来说明本发明的实施例。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。 应当注意, 为了清楚的目的, 附图和说明中省 略了与本发明无关的、本领域普通技术人员已知的部件和处理的表示和描 述。
[40] 根据本发明的实施例,提供了在支持载波汇聚的通信系统中根据终端 进行小区切换时所处于的不同场景来自适应选择切换算法的方案。在本说 明书中,将终端当前接入的当前服务小区所从属的基站称为源基站(即当 前服务于该终端的基站), 将终端的邻居小区所从属的基站称为候选目的 基站或候选基站, 而将终端最终切换至的小区所从属的基站称为目的基 站。这里所谓的邻居小区是指当终端移动至当前服务小区的覆盖边缘时检 测到的在覆盖范围上与该终端的当前服务小区相邻的小区。
[41] 图 1示出了才艮据本发明的一个实施例的、支持载波汇聚的通信系统中 的终端切换小区的方法。
[42] 当终端进行小区切换时,需要首先测量其各个邻居小区的性能。此时, 终端处于当前服务小区的覆盖边缘,可能会同时检测到一个或更多个邻居 小区。这些邻居小区可能会从属于不同的候选基站, 而这些候选基站可能 支持各种载波汇聚方式。在不同的载波汇聚方式下,这些邻居小区会呈现 出不同的特性。在图 1所示的实施例中,终端才艮据所检测到的不同载波汇 聚方式下的邻居小区的不同特性,选择其中的一部分或者全部作为测量对 象。
[43] 如图 1所示, 所述方法可以包括步骤 103、 步骤 109和步骤 115。
[44] 在步骤 103中,才艮据所检测到的一个或更多个邻居小区的载波汇聚方 式, 从中选择一个或更多个作为测量对象。 换言之, 可以根据这些邻居小 区的不同的载波汇聚方式下的不同特性来选择测量对象,而不是简单地对 所有邻居小区均进行测量。作为一个示例, 可以由终端的源基站来进行测 量对象的选择, 然后由源基站将选择结果通知给终端; 作为另一示例, 还 可以由终端来进行测量对象选择。 [45] 在步骤 109中,终端测量步骤 103中得到的一个或更多个测量对象的 性能, 得到一个或更多个测量结果。 在步骤 115中, 终端利用这些测量结 果形成对一个或更多个邻居小区的性能测量 4艮告,并将性能测量 4艮告发送 给源基站。
[46] 利用图 1所示的方法, 能够减少需要测量的小区的数量,从而降低终 端的测量负载, 提高处理速度。
[47] 应该理解,终端可以采用任何适当的方法来测量某个小区的性能(小 区的性能可以釆用一个或更多个适当的性能参数来表征), 作为该小区的 测量结果。本说明书中省略了对具体测量方法和性能参数的描述, 而将测 量得到的小区的性能参数, 统称为小区的性能。
[48] 图 2示出了根据本发明的另一实施例,其中,提供了一种用于从一个 或更多个邻居小区中选择测量对象的方法。 在连续性载波汇聚的场景下, 从属于某个候选基站的各个邻居 d、区所对应的载波单元位于相同的频带 内, 因此这些载波单元的传播特性相似。 利用这种特性, 在可以在从属于 该候选基站的邻居小区中选择一个作为测量对象,而对该测量对象的测量 结果可以作为从属于该候选基站的所有邻居小区的测量结果。
[49] 如图 2所示, 在步骤 103-1中, 确定一个或更多个邻居小区中的从属 于同一基站的邻居小区所对应的载波单元是否位于同一频带内。 也就是 说, 首先判断从属于同一基站的邻居小区是否为连续性的载波汇聚方式。 如果是, 则在步骤 103-2中, 在从属于同一基站的邻居小区中选择一个或 几个(优选地, 选择一个)作为测量对象。 如果不是, 则在步骤 103-3中, 将从属于同一基站的邻居小区中的所有小区作为测量对象。具体而言,如 果只有一个邻居小区对应于某个候选基站, 则该邻居小区作为测量对象。 如果有多个邻居小区对应于某个候选基站且这些邻居小区不在相同的频 带内, 则从属于该候选基站的邻居小区均作为测量对象。如果有多个邻居 小区对应于某个候选基站且这些邻居小区在同一频带内,则不需将从属于 该候选基站的所有邻居小区均作为测量对象。图 2所示的步骤可以由进行 小区切换的终端或者其源基站来完成。
[50] 图 2 的实施例利用连续性载波汇聚方式下的小区的频谱特征和传播 特性, 减少了需要测量的邻居小区的数量,从而大大降低了终端的测量负 载。在其他实施例或示例中,还可以利用其他载波汇聚场景下邻居小区的 其他适当特性来筛选用于测量的对象, 这里不——列举。 [51] 应理解,上述选择测量对象的方法可以应用到上文所描述的或下文将 要描述的小区切换方法的其他实施例中。
[52] 在一些实施例中,终端在向源基站发送测量结果之前,还可以根据一 些条件对这些测量结果进行筛选。只有符合条件的测量结果, 才会被发送 给源基站。这样能够减少通信系统需要处理的测量结果的数量,从而降低 通信线路的传输负载以及源基站的处理负载。 图 3-6分别示出了终端对测 量结果进行优化处理的方法的一些具体实施例。
[53] 在图 3的实施例中,终端设置测量结果的发送阈值, 以减少需要处理 的测量报告的数量, 从而降低通信线路的传输负载以及源基站的处理负 载。 如图 3所示, 在步骤 110中, 终端确定测量得到的一个或更多个测量 结果中的每个测量结果是否高于一阔值, 若是, 则在步骤 115中, 向源基 站发送该测量结果,即将该测量结果包括于发送给源基站的性能测量报告 中。如果某个测量结果低于上述阔值,则终端不向源基站发送该测量结果, 即不将该测量结果包括于发送给源基站的性能测量报告中。应理解, 上述 阔值可以是根据实际需要来设定的,例如根据所测量的性能参数或者实际 的通信场景来设定, 这里不详细描述。 作为一个示例, 上述阈值可以是由 系统(或基站)为终端设置的值或者是由终端根据实际应用场景来确定的 值。 作为另一示例, 上述阔值可以预先设置在终端中。
[54] 在图 4的实施例中,终端或者其源基站才艮据源基站载波汇聚方式来指 定用于与测量结果进行比较的待比较对象,从而使得测量结果的筛选方法 自适应于实际的通信场景, 并进一步优化测量报告的发送。 具体地, 处于 同一频带中的载波单元通常具有相似的传播特性, 因此, 当源基站为连续 性载波汇聚方式时,可以从其小区中任意选择一个作为待比较对象进行测 量, 从而降低终端的测量负载和处理负载, 提高处理速度。 而当源基站为 非连续性载波汇聚方式时, 由于各个小区的载波单元位于不同的频带内, 因此,各个小区的传播特性是不同的。这种情况下可以将源基站的所有小 区作为待比较对象进行测量。 如图 4所示, 在步骤 111中, 终端或者源基 站确定源基站的所有小区(或者终端当前接入到的所有小区)所对应的载 波单元是否位于不同的频带内。
[55] 如果步骤 111的判断结果为是, 则在步骤 112中, 终端将每个测量结 果与源基站的所有小区的性能进行比较,或者将每个测量结果与某个阈值 相比较(与图 3所示的实施例相似,该阈值也可以是由系统或基站或终端 预先确定或根据实际应用来确定的, 这里不再赘述)。 如果某个测量结果 优于源基站的所有小区的性能或者高于该阔值,则可以在步骤 115中向源 基站发送该测量结果, 否则, 不向源基站发送该测量结果。
[56] 如果步骤 111的判断结果为否,即源基站的所有小区所对应的载波单 元位于同一频带内, 则在步骤 112中, 终端将每个测量结果与源基站的所 有小区中的任一个的性能进行比较,或者将每个测量结果与某个阔值相比 较(与图 3所示的实施例相似,该阔值也可以是由系统或基站或终端预先 确定或根据实际应用来确定的, 这里不再赘述)。 如果某个测量结果优于 在源基站的所有小区中随机选择的任一小区的性能或者高于该阈值,则在 步骤 115中向源基站发送该测量结果, 否则, 则不向源基站发送该测量结 果。
[57] 作为一个示例,终端可以釆用图 5或图 6的方法来实现测量结果与源 基站的小区的性能的比较。
[58] 如图 5所示,将邻居小区的测量结果与源基站的所有小区的性能进行 比较的方法(如图 4的步骤 112 )可以包括步骤 112-1和 112-2。 在步骤
112- 1 中, 将源基站的所有小区 (终端当前接入的、 源基站的所有小区) 中性能最好的一个小区作为比较对象, 并终端测量该比较对象的性能。在 步骤 112-2中, 终端将每个测量结果与性能最好的一个小区的性能进行比 较。采用图 5的方法,终端不必将测量结果与源基站的每个小区的性能进 行比较, 从而降低了终端的处理负载, 加快了处理速度。 作为一个示例, 终端当前接入到的所有小区中性能最好的一个小区可以是由源基站(例如 根据其保存的性能数据)来指定并通知给终端的。 作为另一示例, 可以由 终端根据其保存的性能数据或历史测量结果、在当前接入到的所有小区中 选择性能最好的一个小区,或者,可以由终端对其当前接入的所有小区进 行测量, 并选择其中性能最好的一个作为比较对象。
[59] 如图 6所示,将邻居小区的测量结果与源基站的任一小区的性能进行 比较的方法(如图 4的步骤 113 )可以包括步骤 113-1和 113-2。 在步骤
113- 1 中, 将从源基站的所有小区 (终端当前接入的所有小区) 中随机选 择一个小区作为比较对象, 并测量该比较对象的性能。 在步骤 113-2中, 终端将每个测量结果与该所选小区的性能进行比较。采用图 6的方法, 终 端仅需测量源基站的一个小区的性能,这样能够降低终端的测量和处理负 载, 提高处理速度。 作为一个示例, 可以由源基站从终端当前接入到的所 有小区中随机指定一个作为比较对象, 并将该比较对象通知给终端。作为 另一示例,可以由终端在其当前接入的所有小区中任意选择一个作为比较 对象。
[60] 应理解, 图 3-6 所示实施例 /示例中的处理测量结果的方法可以应用 于本发明的小区切换方法的其他实施例中。
[61] 图 7和图 8分别示出了应用上述实施例 /示例中的方法的小区切换设 备。图 7或图 8所示的设备 700或 800可以设置于支持载波汇聚的通信系 统的终端 (图中未示出) 中。
[62] 如图 7所示, 小区切换设备 700包括: 测量对象选择装置 701、 小区 测量装置 702和发送装置 703。
[63] 当终端移动至当前服务小区的覆盖边缘时, 该测量对象选择装置 701 用于才艮据检测到的一个或更多个邻居小区的载波汇聚方式,从邻居小区中 选择一个或更多个作为测量对象。
[64] 小区测量装置 702用于测量所选择的一个或更多个测量对象的性能, 得到一个或更多个测量结果。 发送装置 703 用于根据小区测量装置 702 得到的测量结果,形成一个或更多个邻居小区的性能测量■ ^告, 并将性能 测量报告发送给当前服务于该终端的源基站。
[65] 与图 1的方法实施例相似,设备 700根据所检测到的邻居小区的不同 特性来选择测量对象, 而不是简单地对所有邻居小区均进行测量。 这样, 能够减少需要测量的小区的数量, 从而降低设备(终端)的测量负载, 提 高处理速度。
[66] 如图 8所示, 小区切换设备 800包括测量对象选择装置 801、 小区测 量装置 802和发送装置 803。 与图 7的不同之处再用, 小区切换设备 800 还包括判断装置 804。
[67] 测量对象选择装置 801、 小区测量装置 802和发送装置 803与图 7所 示的相应装置 701、 702、 703功能相似, 这里不再重复。 判断装置 804用 于判断小区测量装置 801得到的每个测量结果是否高于一阔值, 若是, 则 指示所述发送装置 803向源基站发送该测量结果, 否则, 则指示发送装置 803不向源基站发送该测量结果。
[68] 在图 8的实施例中, 小区切换设备 800设置测量结果的发送阔值, 以 减少需要处理的测量报告的数量,从而降低通信线路的传输负载以及源基 站的处理负载。
[69] 在另一实施例中,判断装置 804还可以根据源基站的载波汇聚方式来 选择用于与测量结果进行比较的待比较对象。具体地, 判断装置 804可以 首先确定源基站的所有小区所对应的载波单元是否位于不同的频带内。如 果源基站的所有 d、区所对应的载波单元位于不同的频带内, 则判断装置 804进一步判断小区测量装置 802得到的每个测量结果是否优于源基站的 所有小区的性能或者是否高于某个阔值, 若是, 则指示发送装置 803向源 基站发送该测量结果, 否则, 则不向源基站发送该测量结果。 如果确定源 基站的所有小区所对应的载波单元位于同一频带,则判断装置进一步判断 小区测量装置 802得到的每个测量结果是否优于在源基站的所有小区中 随机选择的任一小区的性能或者是否高于某个阈值, 若是, 则指示发送装 置 803向源基站发送该测量结果, 否则, 则不向源基站发送该测量结果。 这样,对测量结果的筛选能够自适应于实际的通信场景,从而进一步优化 测量报告的发送。在连续性载波汇聚方式,从源基站的小区中任意选择一 个作为待比较对象进行测量, 能够降低终端的测量负载和处理负载,提高 处理速度。
[70] 作为一个示例,设备 800可以釆用例如图 5或图 6的方法来实现测量 结果与源基站的小区的性能的比较。例如, 小区测量装置 802可以测量源 基站的所有小区的性能, 并反馈给判断装置 804。 判断装置 804根据小区 测量装置测量 802得到的源基站的所有小区的性能来选择其中性能最好 的一个小区,并将每个测量结果与所述性能最好的一个小区的性能进行比 较。这样,设备 800不必将测量结果与源基站的每个小区的性能进行比较, 从而降低了设备的处理负载, 加快了处理速度。 又如, 小区测量装置 802 可以测量在源基站的所有小区中随机选择的一个小区的性能;而判断装置 804可以邻居小区的测量结果与所选小区的性能进行比较。这样,设备 800 仅需测量源基站的一个小区的性能,从而降低测量和处理负载,提高处理 速度。
[71] 与上述方法实施例 /示例相似, 上述设备实施例 /示例中所述的阔值可 以由系统(或基站)或终端根据实际需要来设定, 这里不再重复。
[72] 与上述方法实施例相同,设备 700或 800可以采用任何适当的方法来 测量某个小区的性能, 小区的性能可以釆用任何适当的性能参数来表征, 这里不再赘述。
[73] 作为一个示例, 测量对象选择装置 701/801还可以判断一个或更多个 邻居小区中从属于同一基站的邻居小区所对应的载波单元是否位于同一 频带内; 若是, 则从中选择一个邻居小区作为测量对象, 否则, 则将从属 于同一基站的邻居小区中的所有小区作为测量对象。该示例利用连续性载 波汇聚方式下的小区的频 i普特征和传播特性,减少了需要测量的邻居小区 的数量, 从而大大降低了终端的测量负载。 在其他实施例或示例中, 测量 对象选择装置 701/801还可以利用其他载波汇聚场景下邻居小区的其他适 当特性来筛选用于测量的对象, 这里不——列举
[74] 根据本发明的一些实施例,还提供了支持载波汇聚的通信系统中的终 端。 所述终端可以包括上述设备实施例 /示例中的小区切换设备, 或者可 以利用上述方法实施例 /示例中的小区切换方法。 这里不再赘述。
[75] 另夕卜, 在参考图 7-8描述的设备实施例中, 测量对象的选择是在终端 侧进行的。 由终端(而不是源基站)来选择测量对象, 可以减少终端和基 站之间进行通信所需的开销,从而提高处理速度和效率。根据另一实施例, 还提供了一种包括小区切换设备的基站(图中未示出), 该基站的小区切 换设备可以包括测量对象确定装置。该测量对象确定装置用于根据基站所 服务的终端所检测到的一个或更多个邻居小区的载波汇聚方式,从中选择 一个或更多个作为测量对象。 相应地, 在该实施例中, 还提供了一种在基 站侧进行的小区切换方法,该方法包括: 由基站根据其所服务的终端所检 测到的一个或更多个邻居小区的载波汇聚方式,从中选择一个或更多个作 为测量对象; 并将所述测量对象通知给终端。 具体地, 基站(例如, 利用 测量对象确定装置)首先确定一个或更多个邻居小区中的从属于同一基站 的邻居小区所对应的载波单元是否位于同一频带内; 如果是, 则从属于同 一基站的邻居小区中选择一个或几个(优选地,选择一个)作为测量对象, 如果不是, 则将从属于同一基站的邻居小区中的所有小区作为测量对象。 然后, 由基站的发送装置将测量对象通知给终端。 作为一个示例, 所述测 量对象确定装置也可以合并于下文中将要描述的各个实施例 /示例中的配 置于基站侧的小区切换设备中。 另外, 由基站选择测量对象的方法也可以 合并于下文中将要描述的各个实施例 /示例中的由基站进行的小区切换方 法的流程中。
[76] 下文中将描述在支持载波汇聚的通信系统中在基站侧进行目的基站 和待接入小区选择的方法、 设备以及包括这样的设备的基站和通信系统。
[77] 在传统的单载波通信系统中,终端仅接入一个小区。 当进行小区切换 时,只要根据邻居小区的测量报告既可确定唯一的待接入小区,也即唯一 地确定了目的基站。在载波汇聚的场景下, 终端在切换小区之前可能同时 接入多个小区,而这些小区都只对应于一个源基站。而在进行小区切换后, 终端仍然可能同时接入多个小区。如果仅根据邻居小区的性能来选择待接 入小区, 则存在所选择的待接入小区从属于不同基站的可能性。本发明的 一些实施例提供了在载波汇聚场景下源基站选择目的基站及待接入小区 的策略或方案。
[78] 图 9示出了一个实施例,其中, 示出了支持载波汇聚的通信系统中的 基站(称为源基站 )根据其所服务的终端发送的有关该终端的邻居小区的 性能测量报告来选择目的基站和待接入小区的方法。
[79] 如图 9所示, 该方法包括步骤 903、 908和 915。 在步骤 903中, 源 基站接收其所服务的某个终端发送的对该终端的邻居小区的性能测量报 告。 该性能测量艮告可以包括终端对其一个或更多个邻居节点的测量结 果。这些邻居节点可以对应于一个或几个候选基站。 源基站基于不同候选 基站的不同载波汇聚方式来选择不同的算法,以便计算这些候选基站的优 先级。 然后, 在步骤 909中, 源基站根据所计算的优先级从这些候选基站 中选择优先级最高的一个作为目的基站。在步骤 915中, 源基站从一个或 更多个邻居小区中从属于该目的基站的所有小区中选择一个或更多个,作 为终端的待接入小区。
[80] 由于候选基站可能支持不同的载波汇聚方式,因此其邻居小区会呈现 出不同的特性。在图 9所示的实施例中, 源基站根据这些邻居小区的载波 汇聚方式来自适应选择优先级计算算法。这样能够使得对目的基站的选择 更适应于实际的通信场景。 另夕卜, 该方法首先确定目的基站, 然后再从目 的基站的小区中选择待接入小区,避免了所选择的待接入小区从属于不同 基站的情况。
[81] 图 10示出了一个根据各个候选基站的载波汇聚场景来选择不同的优 先级算法的具体实施例。
[82] 如图 10所示,才艮据载波汇聚场景来选择不同的优先级算法的方法(如 步骤 903 ) 可以包括步骤 903-1、 903-2和 903-3。 在步骤 903-1中, 源基 站首先判断性能测量报告中涉及的一个或更多个邻居小区中从属于同一 候选基站的邻居小区所对应的载波单元是否位于同一频带内。 如上所述, 这些邻居小区可能对应于一个或几个候选基站。
[83] 如果有超过一个的邻居小区对应于同一候选基站且这些邻居小区位 于同一频带内, 则在步骤 903-2中, 源基站根据从属于该候选基站的所有 邻居小区的性能来计算该候选基站的优先级(如果仅一个邻居小区对应于 某个候选基站, 则根据该邻居小区的性能来确定该候选基站的优先级)。 作为示例, 源基站可以根据性能测量 · ^告中的测量结果,将从属于该候选 基站的所有邻居小区的性能求和,或者将从属于该候选基站的所有邻居小 区的性能加权之后再求和, 并根据所计算的值来确定该候选基站的优先 级。 所计算的值越高, 则优先级越高。 应理解, 可以根据各邻居小区的功 能和实际的应用场景来确定加又值, 这里不作详述。
[84] 如果有超过一个的邻居小区对应于同一候选基站且这些邻居小区位 于不同的频带内, 则在步骤 903-3中, 源基站根据性能测量报告中从属于 该候选基站的所有邻居小区中性能最好的一个的性能来确定该候选基站 的优先级。该性能最好的一个邻居小区的性能越好, 则该候选基站的优先 级越高。
[85] 在图 10的实施例中, 才艮据连续性载波汇聚场景与非连续性载波汇聚 场景的不同,来选择不同的优先级计算方法,从而得到各个候选基站的优 先级。
[86] 在载波汇聚的场景下, 所选择的目的基站可能支持载波汇聚, 因此, 终端在切换到目的基站后可能接入多个小区。作为一个示例, 可以将目的 基站的所有小区选择为终端的待接入小区。作为另一示例,还可以将一个 或更多个邻居节点中从属于目的基站的所有邻居小区作为终端的待接入 小区,或者在从属于目的基站的所有邻居小区中选择一个或更多个作为终 端的待接入小区。 图 11-12分别示出了才艮据不同的载波汇聚场景而釆用不 同的方式来选择待接入小区的其他具体示例。
[87] 如图 11所示, 从目的基站的小区中选择待接入小区的方法(如步骤 915 )可以包括步骤 915-1、 915-2和 915-3。 在步骤 915-1中, 源基站确定 性能测量报告中涉及的一个或更多个邻居小区中从属于目的基站的所有 小区所对应的载波单元是否位于同一频带内,即确定目的基站的载波汇聚 方式是否为非连续性的。
[88] 如果确定了从属于目的基站的所有邻居小区所对应的载波单元位于 同一频带内, 则在步骤 915-2中, 源基站选择一个或更多个邻居小区中从 属于所述目的基站的所有邻居小区作为待接入小区。如果仅一个邻居小区 从属于目的基站, 则选择该邻居小区作为待接入小区。 [89] 如果确定了从属于目的基站的所有邻居小区所对应的载波单元位于 不同的频带内, 则在步骤 915-3中, 源基站选择从属于目的基站的所有邻 居小区中的一个或更多个, 作为待接入小区。 例如, 源基站可以在从属于 目的基站的所有邻居小区中选择位于同一频带内的多个小区,作为待接入 小区,或者, 源基站也可以根据终端的实际需求来选择其中位于不同频带 内的多个小区, 作为待接入小区。
[90] 作为一个示例, 源基站在选择了一个或更多个待接入小区之后(例如 在步骤 915之后), 还可以从所选择的待接入小区中选择一个作为主待接 入小区, 如图 11的虚线框 916所示。 所谓主待接入小区是指在存在多个 待接入小区的情况下终端进行小区切换时首先接入的小区。终端可以首先 接入主待接入小区。在完成对主待接入小区的接入之后, 终端可以釆用添 加并激活载波单元的方式接入其他待接入' j、区,例如可以使用不包括移动 控制消息的 RRC连接重配置的方式进行与其他待接入小区对应的载波单 元的添加, 从而以较小的开销实现载波汇聚的传输模式。
[91] 图 12示出了根据载波汇聚场景来选择主待接入小区的一个示例。 如 图 12所示, 从多个待接入小区中选择一个主待接入小区的方法(如步骤 916 )包括步骤 916-1、 916-2和 916-3。 在步骤 916-1中, 源基站判断性能 测量报告判断所选择的一个或多个待接入小区中是否有这样的小区:该小 区所对应的载波单元与终端的当前服务小区所对应的载波单元位于同一 频带内。 若存在这样的小区, 则在步骤 916-2中选择该小区作为主待接入 小区。 如果没有这样的小区, 则可以在步骤 916-3中根据性能测量报告来 选择所有待接入小区中性能最好的一个作为主待接入小区。
[92] 在图 12所示的示例中, 尽可能选择频率与终端的当前服务小区的频 率一致的主待接入小区,这样能够减少由于切换前后的小区所对应的频率 不一致所带来的切换开销, 从而进一步减少通信中断的时间。
[93] 作为一个示例,其他待接入小区的接入可以使用不包括移动控制信息 的 RRC ( Radio Source Control, 无线资源控制)连接重配置的方式来添 加载波的方法, 从而以较小的开销实现载波汇聚的传输模式。 应注意, 存 在两种 RRC连接重配置的方式, 第一种是包含移动控制信息的重配置, 也就是切换。第二种是不包含移动控制信息的重配置。在切换(即第一种) 方式下, MAC ( Media Access Control,媒体接入控制)层、 PDCP ( Packet Data Convergence Protocol, 分组数据汇聚协议)层、 RLC ( Radio Link Control, 无线链路控制)层均需要重置, 安全密钥也需要重新设置, 开 销很大。 而第二种方式则不需要重置上述功能, 因而开销较小。
[94] 在一个其他示例中, 源基站还可以根据性能测量报告,在从属于目的 基站的所有邻居小区中(或在源基站所选择的待接入小区中)选择性能最 好的一个作为主待接入小区。
[95] 图 13示出了才艮据本发明的另一实施例的小区切换方法。如图 13所示, 在确定了目的基站和待接入小区 (应理解, 可以应用上述实施例 /示例中 的方法来确定目的基站和待接入小区)之后, 源基站形成切换命令并发送 切换命令的过程可以包括步骤 917、 919、 921和 923。
[96] 在步骤 917中,源基站判断所选择的一个或更多个待接入小区所对应 的载波单元是否位于同一频带内。若是, 则在步骤 919中将所有待接入小 区的配置信息封装于用于指示发起所述终端的小区切换的切换命令中,否 则, 则在步骤 921 中仅将主待接入小区的配置信息封装于所述切换命令 中。 最后, 在步骤 923中, 源基站向目的基站发送所述切换命令。
[97] 在图 13所示的方法中, 若所选择的待接入小区个数大于 1且这些待 接入小区所对应的载波单元位于同一频带内,则源基站将所有待接入小区 的信息包括于切换命令中。这样, 终端能够一次性实现对所有待接入小区 的接入。 也就是说, 终端在切换小区后, 能够直接进入载波汇聚模式。 若 终端切换前使用的是载波汇聚的通信模式,则能够使得用户的服务质量得 到保证, 减少切换前后的服务盾量差异。若所选择的待接入小区个数大于 1且这些待接入小区所对应的载波单元位于不同频带内, 则终端可以首先 接入主待接入小区。在完成对主待接入小区的接入之后, 终端可以釆用添 加载波单元的方式接入其他待接入小区,例如可以使用不包括移动控制消 息的 RRC连接重配置的方式进行与其他待接入小区对应的载波单元的添 加,从而以较小的开销实现载波汇聚的传输模式。如果所选择的主待接入 小区与终端切换前的服务小区对应于同一频带内的载波单元,则还可以进 一步减少由于切换前后的频率不一致所带来的开销,从而进一步缩短通信 中断的时间。
[98] 作为一个示例,若终端当前接入到源基站的多个小区,则在切换完成 之前, 终端可以保持与当前接入到的多个小区中的一个的通信。传统的单 载波通信系统(如 LTE系统)在进行小区切换时, 使用的是硬切换的方 式。 也就是说, 在切换的过程中, 终端会先切断与旧小区的通信, 再接入 到新的小区,这样不可避免地会出现通信中断,从而影响用户的服务质量。 在该示例中, 利用了载波汇聚通信的优势, 在终端接入到新的小区前, 保 留与一个或多个旧小区的通信。 当终端完全接入到新的小区后,再切断与 旧小区的通信,这样能够极大地减少通信中断的时间,从而提高用户感受 到的服务质量。
[99] 图 15示出了根据本发明的另一实施例在支持载波汇聚的通信系统中 的小区切换方法。 该方法是由通信系统中的源基站来实施的。
[100] 如图 15所示, 该方法可以包括步骤 1517、 1519、 1521和 1523。 在 步骤 1517中, 源基站为其所服务的要进行切换的某个终端选择了目的基 站以及一个或更多个待接入小区之后,确定所选择的待接入小区所对应的 载波单元是否位于同一频带内。 若是, 则在步骤 1519中将所有待接入小 区的配置信息封装于用于发起所述终端的小区切换的切换命令中; 否则, 则在步骤 1521中仅将待接入小区中的部分小区(如一个小区或几个小区) 的配置信息封装于所述切换命令中。 最后在步骤 1523中, 发送所述切换 命令。 采用这种方法, 在待接入小区为连续性载波汇聚的情况下, 能够一 次性实现所有待接入小区的接入,使得终端在切换小区后能够直接进入载 波汇聚模式。在终端切换前使用的是载波汇聚的通信模式的情况下, 能够 使得用户的服务质量得到保证, 减少切换前后的服务质量差异。
[101] 图 20示出了根据本发明的另一实施例在支持载波汇聚的通信系统中 的小区切换方法。 该方法与图 15所示的实施例相似, 不同之处在于, 图 20所示的方法还可以包括一个主待接入小区选择步骤 2016。
[102] 如图 20所示,该方法可以包括步骤 2016、 2017、 2019、 2021和 2023。
步骤 2017、 2019、 2021和 2023分别与图 15所示的步骤 1517、 1519、 1521 和 1523相似, 这里不再赘述。 在步骤 2016中, 源基站可以从所选择的一 个或更多个待接入小区中, 选择一个作为主待接入小区。 在该示例中, 源 基站可以在步骤 2021 中仅将主待接入小区的配置信息封装于切换命令 中。 应理解, 可以采用上文中各个实施例 /示例所描述的方法来选择主待 接入小区, 这里也不再重复。
[103] 作为一个示例,图 15或 20所示的方法还可以包括源基站选择目的基 站和待接入小区的步骤, 例如图 20所示的步骤 2009和 2015。 例如, 在 步骤 2009和 2015中,源基站分别根据终端发送的性能测量报告而在该终 端的邻居小区所对应的候选基站中选择目的基站,并在目的基站的小区中 选择一个或更多个待接入小区。应理解, 源基站可以釆用任何适当的方法 来选择目的基站和待接入小区, 例如, 可以釆用上文中参考图 9-13而描 述的实施例 /示例中的方法来选择目的基站和待接入小区, 这里不再重复 说明。
[104] 图 14和图 16分别示出了在载波汇聚场景下用于小区切换的设备的实 施例 /示例。 图 14或 16所示的设备设置于支持载波汇聚的通信系统中的 基站中。 图中虚线框所示的装置为可选的。
[105] 在图 14的实施例中, 小区切换设备 1400可以包括接收装置 1401、 优先权确定装置 1402、 目的基站选择装置 1403和小区选择装置 1404。接 收装置 1400用于接收基站所服务的终端发送的对一个或更多个邻居小区 的性能测量报告。 优先级确定装置 1402用于根据所述性能测量报告并基 于与一个或更多个邻居小区对应的一个或更多个候选基站的载波汇聚方 式, 选择不同的算法来计算各个候选基站的优先级。 目的基站选择装置 1403可以用于根据优先级确定装置 1402计算的优先级, 选择各个候选基 站中优先级最高的一个作为目的基站。 小区选择装置 1404用于在从属于 目的基站的小区中选择终端的一个或更多个待接入小区。
[106] 由于候选基站可能支持不同的载波汇聚方式,因此其邻居小区会呈现 出不同的特性。在上述示例中, 源基站的设备根据这些邻居小区的载波汇 聚方式来自适应选择不同的优先级计算算法。这样能够使得对目的基站的 选择更适应于实际的通信场景。 另夕卜, 该设备首先确定目的基站, 然后再 从目的基站的小区中选择待接入小区,避免了所选择的待接入小区从属于 不同基站的情况。
[107] 作为上述实施例的一个具体示例, 优先级确定装置 1402可以首先判 断候选基站是否为连续性载波汇聚模式,然后选择分别适于连续性和非连 续性载波汇聚方式的算法。 具体地, 优先级确定装置 1402可以判断一个 或更多个邻居小区中从属于同一候选基站的邻居小区所对应的载波单元 是否位于同一频带内。
[108] 如果有超过一个的邻居小区对应于同一候选基站且这些邻居小区位 于同一频带内, 则优先级确定装置 1402可以根据从属于该候选基站的所 有邻居小区的性能来计算该候选基站的优先级(如果仅一个邻居小区对应 于某个候选基站,则根据该邻居小区的性能来确定该候选基站的优先级)。 作为示例,可以根据性能测量报告中的测量结果,将从属于该候选基站的 所有邻居小区的性能求和,或者将从属于该候选基站的所有邻居小区的性 能加权之后再求和, 并根据所计算的值来确定该候选基站的优先级。所计 算的值越高, 则优先级越高。 与上述方法实施例 /示例相似, 可以根据各 邻居小区的功能和实际的应用场景来确定加权值, 这里不再重复。
[109] 如果有超过一个的邻居小区对应于同一候选基站且这些邻居小区位 于不同的频带内, 则优先级确定装置 1402可以根据性能测量报告中从属 于该候选基站的所有邻居小区中性能最好的一个的性能来确定该候选基 站的优先级。该性能最好的一个邻居小区的性能越好, 则该候选基站的优 先级越高。
[110] 作为具体示例, 小区选择装置 1404还可以在性能测量报告中涉及的 一个或更多个邻居小区中的、从属于目的基站的所有邻居小区中选择一个 或更多个, 作为待接入小区。 例如, 小区选择装置 1404可以将性能测量 报告中涉及的一个或更多个邻居小区中的、从属于目的基站的所有邻居小 区作为终端的待接入小区。 作为另一示例, 小区选择装置 1404还可以在 目的基站的所有小区中选择一个或更多个作为终端的待接入小区。作为示 例, 小区选择装置还可以采用上文中参考图 11-12所描述的方法来才艮据不 同的载波汇聚场景而釆用不同的方式来选择待接入小区,从而使得所选择 的待接入小区更适应于实际的载波汇聚场景。
[111] 例如, 小区选择装置 1404可以首先确定性能测量报告中所涉及的一 个或更多个邻居小区中的、从属于所述目的基站的所有邻居小区所对应的 载波单元是否位于同一频带, 若是, 则选择从属于所述目的基站的所有邻 居小区作为待接入小区; 否则,在从属于所述目的基站的邻居小区中选择 一个或更多个, 作为待接入小区。 如果仅一个邻居小区从属于目的基站, 则选择该邻居小区作为待接入小区。
[112] 作为一个示例, 小区选择装置 1404还可以从所选择的待接入小区中 选择一个作为主待接入小区。 例如, 小区选择装置 1404可以判断所选择 的一个或更多个待接入小区中是否存在所对应的载波单元与所述终端的 当前服务小区所对应的载波单元位于同一频带内的小区, 若是, 则选择该 小区作为主待接入小区, 否则, 则根据所述性能测量报告在从属于所述目 的基站的所有邻居小区中选择性能最好的一个作为主待接入小区。 又如, 在小区选择装置 1404还可以在目的基站选择装置 1403选择了目的基站之 后,在从属于所述目的基站的所有邻居小区中选择性能最好的一个作为主 待接入小区。 小区选择装置 1404可以釆用上文中的方法实施例 /示例中所 描述的方法来选择主待接入小区, 这里不再重复。 [113] 在另一示例中,设备 1400还可以包括命令形成装置 1405和发送装置 1406。命令形成装置 1405可以釆用图 13所示的方法来形成切换命令。具 体地, 命令形成装置 1405可以确定所选的待接入小区所对应的载波单元 是否位于同一频带内,若是,将所有待接入小区的配置信息封装于切换命 令中; 否则, 仅将所述主待接入小区的配置信息封装于切换命令中。发送 装置 1406用于向目的基站发送所述切换命令。 利用该示例, 在所选择的 待接入小区个数大于 1且这些待接入小区位于同一频带的情况下,终端能 够一次性实现对所有待接入小区的接入。 也就是说, 终端在切换小区后, 能够直接进入载波汇聚模式。 若终端切换前使用的是载波汇聚的通信模 式,则能够使得用户的服务质量得到保证,减少切换前后的服务质量差异。 另外,而在所选择的待接入小区所对应的载波单元位于不同频带内的情况 下,终端可以首先接入主待接入小区。在完成对主待接入小区的接入之后, 终端可以釆用添加载波单元的方式接入其他待接入小区,例如可以使用不 包括移动控制消息的 RRC连接重配置的方式进行与其他待接入小区对应 的载波单元的添加, 从而以较小的开销实现载波汇聚的传输模式。
[114] 作为一个示例,若进行切换的终端当前接入到源基站的多个小区, 则 终端在切换到目的基站之前保持与当前接入到的多个小区中的一个的通 信。 例如, 可以有源基站(如发送装置 1406 )向所述终端发送命令, 用 于指示终端保持与某个原小区的通信。 与上述方法实施例 /示例相似, 这 样能够极大地减少通信中断的时间, 从而提高用户感受到的服务质量。
[115] 在图 16的实施例中,设备 1600可以实施图 15所示的方法。具体地, 设备 1600可以包括命令形成装置 1605和发送装置 1606。
[116] 命令形成装置 1605用于确定该基站为其所服务的、 要进行小区切换 的终端选择的从属于目的基站的一个或更多个待接入小区所对应的载波 单元是否位于同一频带内, 若是, 则将所有待接入小区的配置信息封装于 用于发起所述终端的小区切换的切换命令中; 否则,将所述待接入小区中 的部分小区(一个或几个小区)的配置信息封装于所述切换命令中。发送 装置 1606用于发送所述切换命令到目的基站。 利用该实施例的设备, 在 所选择的待接入小区所对应的载波单元位于同一频带内的情况下,进行小 区切换的终端可以同时接入所有待接入小区,使得终端在切换小区后能够 直接进入载波汇聚模式。在终端切换前使用的是载波汇聚的通信模式的情 况下,能够使得用户的服务质量得到保证,减少切换前后的服务质量差异。
[117] 作为一个示例,小区切换设备 1600还可以包括主小区选择装置 1607, 用于从所选择的一个或更多个待接入小区中选择一个作为主接入小区。这 样,命令形成装置可以在形成切换命令时仅将主切换小区的配置信息封装 在该命令中。 而这种情况下, 终端可以首先接入主待接入小区。 在完成对 主待接入小区的接入之后,终端可以采用添加并激活载波单元的方式接入 其他待接入小区, 例如可以使用不包括移动控制消息的 RRC连接重配置 的方式进行与其他待接入小区对应的载波单元的添加,从而以较小的开销 实现载波汇聚的传输模式。
[118] 具体地, 主小区选择装置 1607可以根据性能测量报告在所选择的待 接入小区中选择性能最好的一个, 作为主待接入小区。
[119] 或者, 主小区选择装置 1607还可以根据所选择的待接入小区的载波 来选择主待接入小区。 具体地, 主小区选择装置 1607可以判断所选择的 待接入小区中是否存在所对应的载波单元与所述终端的当前服务小区所 对应的载波单元位于同一频带内的小区,若是, 则选择该小区作为主待接 入小区, 否则, 则选择从属于所述目的基站的所有邻居小区中的性能最好 的一个作为主待接入小区。但所选择的主待接入小区与终端的当前服务小 区位于相同的频带内时,可以减小由于切换前后的小区频率不一致所带来 的切换开销, 从而进一步减少通信中断的时间。
[120] 作为一个示例, 小区切换设备 1600还可以包括接收装置 1601、 目的 基站选择装置 1603和小区选择装置 1604。与前述实施例 /示例相似,接收 装置 1601用于接收基站所服务的终端发送的对一个或更多个邻居小区的 性能测量报告。 目的基站选择装置 1603用于根据所述性能测量报告从与 一个或更多个邻居小区对应的一个或更多个候选基站中选择一个作为目 的基站。 目的基站选择装置 1603可以釆用上述实施例 /示例中描述的方法 或其他适当的方法来选择目的基站, 例如, 目的基站选择装置 1603可以 与图 14所示的装置 1403相似, 这里不再重复。 小区选择装置 1604用于 在从属于目的基站的所有邻居小区中选择所述终端的一个或更多个待接 入小区。
[121] 作为一个具体示例, 小区选择装置 1604可以釆用上述实施例 /示例中 示出的方法来选择待接入小区。 例如, 小区选择装置 1604可以确定从属 于所述目的基站的所有邻居小区所对应的载波单元位于同一频带内, 若 是, 则选择从属于所述目的基站的所有邻居小区作为待接入小区, 否贝 'J , 在从属于所述目的基站的所有邻居小区中选择一个或更多个,作为待接入 小区。 [122] 在另一具体示例中,设备 1600还可以包括如参考图 14所描述的实施 例中的优先级确定装置 1402, 其功能可以与上述实施例 /示例相同, 这里 不再重复。
[123] 根据本发,,一些实施例,提供了在载波汇聚场景下进行小区切换 小区切换的流程。 这里不再重复。
[124] 根据本发明的一些实施例, 还提供了包括上文和下文的实施例 /示例 中的终端和 /或基站的通信系统。
[125] 图 17、 图 18、 图 19分别示出了可以应用上述实施例的小区切换算法 的应用场景。 图中, A01-A03、 B01-B03、 C01-A03分别表示基站。 图 17 中的载波单元 FA1和载波 FA2对应的小区覆盖范围基本上重合, 能够提供 相似的覆盖区域。 FA1和 FA2位于相同的载波频带内, 是典型的连续性载 波汇聚方式。 图 18和图 19分别对应于非连续性载波汇聚场景,?^和?^ 位于不同的载波频带, FC1和FC2也位于不同的载波频带。 FB1或FC1对应 的小区主要保证覆盖性, FB2或 FC2对应的小区主要用于提高吞吐量。 图 18和图 19的区别在于, 图 19中 FC2对应的小区天线指向 FC1对应的小区 中的边缘地区, 这样图 19的应用场景可以极大地提高 FC1小区边缘地区 的吞吐量。
[126] 根据一些示例,进行小区切换的过程可以包括准备阶段、执行阶段和 完成阶段。应用场景的不同导致切换策略的不同, 下面将分别描述这三个 典型的应用场景下进行小区切换的流程示例。
[127] 图 17的场景:
[128] 准备阶段:
[129] 当终端位于当前服务小区的覆盖边缘时, 需要对所有的邻居小区(一 个载波频率对应于一个邻居小区,若从属于同一基站的邻居小区位于相同 的频带内, 则只需选择其中的一个邻居小区测量即可)进行测量。 此时, 殳终端在 FA1所对应的小区上的测量结果为 Mfl, 在 FA2所对应的小区 上的测量结果为 M/2, 对其某个邻居小区的测量结果为 Mf。 那么, 只要满 足下列条件之一, 终端即向基站发送该测量结果。
M/≥7¾ 或者 Mf ≥Mfl + Th2 或者 Mf ≥Mf2 + Th2
[130] 也就是说, 只要该邻居小区的测量结果高于一定的门限( )或者 优于终端所接入的任一个小区的测量结果, 终端即向基站发送该测量结 果。 该邻居小区即可作为候选接入小区。
[131] 在实际的执行过程中,基站或者终端可以随机指定终端所接入的小区 中的一个小区作为待比较的对象, 与邻居小区的测量结果进行比较。
[132] 执行阶段:
[133] 该阶段要确定目的基站及接入小区。由于从属于同一个基站的候选小 区所对应的载波频率位于同一个频带内,因此该基站的选择优先级由这些 候选小区的加权性能决定。选择具有最高优先级的基站作为目的基站。 由 于从属于目的基站的候选小区所对应的载波频率位于同一个频带内,因此 所有候选小区均作为接入小区。这里假设将基站 A02中 FA1和 FA2所对应 的小区作为待接入小区。
[134] 完成阶段:
[135] 终端切换前同时接入到多个小区, 所选择的待接入小区的数目为多 个, 并且这些待接入小区所对应的载波单元位于相同的频带内。在发送切 换请求时, 源基站将所有待接入小区的信息发送给目的基站。
[136] 目的基站根据接收到的信息进行接入控制评估后,若允许接入,则发 送 ACK消息给源基站。
[137] 源基站收到该 ACK消息后, 发送包含移动性控制信息的 RRC连接 重配置消息, 由此发起对所有待接入小区的 RRC连接重配置。
[138] 重配置完成后,终端选择断开原有的一个或多个小区,但至少应保留 一个原有的小区保持通信, 并向目的基站的所有待接入小区发起同步请 求, 同步到新的小区。
[139] 当终端完成与目的基站中的所有待接入小区的同步及相应的接入流 程并可以进行数据传输时, 断开与原有小区的连接, 完全由新的基站和小 区为其提供服务。
[140] 图 18的场景:
[141] 准备阶段: 当终端位于小区边缘时, 需要对所有的邻居小区(一个载 波频率对应于一个邻居小区)进行测量。 此时, ^^设终端在 FB 对应的 小区上的测量结果为 M/l 5在 FB2所对应的小区上的测量结果为 M/2,对某 个邻居小区的测量结果为 Mf。 只要满足下列条件之一, 终端即向基站发 送测量该邻居小区的测量结果:
Mf ≥T 或者
Mf ≥Mfl + Th2 Mf ≥Mf 2 + Th2
[142] 也就是说, 只要对邻居小区的测量结果高于一定的门限( )或者 优于终端所处的任一个小区的测量结果,终端将向基站发送测量报告。该 邻居小区可以作为切换候选小区。
[143] 在实际的执行过程中,基站或者终端可以随机指定终端所接入的小区 中的一个小区作为待比较的对象, 与邻居小区的测量结果进行比较。
[144] 执行阶段:
[145] 该阶段要确定目的基站及接入小区。具体地,根据从属于同一个基站 的候选小区所对应的载波频率是否位于同一个频带内,决定候选基站的选 择优先级, 最后选择具有最高优先级的基站作为目的基站。根据从属于目 的基站候选小区的个数,是否位于同一个频带内以及与切换前的载波频率 的关系决定接入小区。 这里假设将基站 B03中 FB1和 FB2所对应的小区作 为接入小区。
[146] 完成阶段:
[147] 假设终端切换前仅接入到一个小区。所确定的待接入小区的数目为多 个, 并且这些待接入小区所对应的载波单元位于不同的频带。这里还假设 FB1为进行切换前的小区的频率。 此时将 FB1所对应的待接入小区选为主 待接入小区,在发送切换请求时, 源基站将主待接入小区的信息发送给目 的基站。
[148] 目的基站进行接入控制评估后, 若允许接入, 则发送 ACK消息给源 基站。
[149] 源基站收到该 ACK消息后, 发送包含移动性控制信息的 RRC连接 重配置消息, 由此发起对主待接入小区的 RRC连接重配置。
[150] 重配置完成后,终端断开与原有小区的连接,并向目的基站的主接入 小区发起同步请求, 同步到新的主接入小区。
[151] 当终端和目的基站中的主接入小区完成同步及相应的接入流程,就可 以进行数据传输了, 此时完全由新的基站和小区为其提供服务。
[152] 终端发起不包含移动控制信息的 RRC连接重配置消息, 由此添加载 波单元 FB2, 并接入到 FB2所对应的小区中, 实现载波汇聚。
[153] 图 19的场景:
[154] 准备阶段:
[155] 当终端位于小区边缘时, 需要对所有的邻居小区(一个载波频率对应 于一个邻居小区)进行测量。 此时, 殳终端在 FC1所对应的小区上的测 量结果为 MFL,在 FC2所对应的小区上的测量结果为 M/2,其邻居小区的测 量结果为 Μ/ Β 只要满足下列条件之一, 终端将向基站发送测量报告。
Mf ≥Th^ , 或者
Mf > Mfl + 7¾2且 MF≥ M/2 + Th2
[156] 也就是说。 只要邻居小区的测量结果高于一定的门限( )或者优 于终端所处的所有小区的测量结果, 终端将向基站发送测量报告。该邻居 小区为切换候选小区。
[157] 在实际的执行过程中,基站或者终端将选择测量结果最好的一个小区 作为待比较的对象, 与邻居小区的测量结果进行比较。
[158] 执行阶段:
[159] 该阶段确定目的基站及接入小区。具体地,根据从属于同一个基站的 候选小区所对应的载波频率是否位于同一个频带内,决定候选基站的选择 优先级, 最后选择具有最高优先级的基站作为目的基站。根据从属于目的 基站候选小区的个数,是否位于同一个频带内以及与切换前的载波频率的 关系决定接入小区。这里假设将基站 C03中 FC1和 FC2所对应的小区作为 待接入小区。
[160] 完成阶段:
[161] 假设终端切换前同时接入到多个小区。所选的待接入小区的数目为多 个, 并且这些接入小区所对应的载波频率位于不同的频带。在发送切换请 求时, 源基站将所有待接入小区的信息发送给目的基站。
[162] 目的基站进行接入控制评估后, 若允许接入, 则发送 ACK消息给源 基站。
[163] 源基站收到该 ACK消息后, 发送包含移动性控制信息的 RRC连接 重配置消息, 由此发起对所有待接入小区的 RRC连接重配置。
[164] 重配置完成后,终端选择断开原有的一个或多个小区,但至少应保留 一个原有的小区保持通信, 并向目的基站的所有待接入小区发起同步请 求, 同步到新的小区。
[165] 当终端和目的基站中的所有待接入小区完成同步及相应的接入流程, 可以进行数据传输时, 断开和原有小区的连接, 完全由新的基站和小区为 其提供服务。
[166] 应理解, 上述实施例和示例是示例性的, 而不是穷举性的, 本发明不 应被视为局限于任何具体的实施例或示例。
[167] 作为一个示例,上述方法的各个步骤以及上述设备的各个组成模块和 /或单元可以实施为通信网络的基站或终端中的软件、 固件、 硬件或其组 合, 并作为该基站或终端的设备中的一部分。 上述设备中各个组成模块、 单元通过软件、 固件、硬件或其组合的方式进行配置时可使用的具体手段 或方式为本领域技术人员所熟知, 在此不再赘述。 作为一个示例, 可以在 已有基站或终端的设备中实施根据本发明上述方法和 /或设备, 其中对已 有基站或终端的各组成部分作一定修改即可。
[168] 作为一个示例,在通过软件或固件实现的情况下,可以从存储介质或 网络向具有专用硬件结构的计算机(例如图 21所示的通用计算机 2100 ) 安装构成用于实施上述方法的软件的程序, 该计算机在安装有各种程序 时, 能够执行各种功能等。
[169] 在图 21中, 中央处理单元 (CPU)2101根据只读存储器 (ROM)2102中 存储的程序或从存储部分 2108加载到随机存取存储器 (RAM)2103的程序 执行各种处理。在 RAM 2103中, 也根据需要存储当 CPU 2101执行各种 处理等等时所需的数据。 CPU 2101、 ROM 2102和 RAM 2103经由总线 2104彼此连接。 输入 /输出接口 2105也连接到总线 2104。
[170] 下述部件链路到输入 /输出接口 2105: 输入部分 2106 (包括键盘、 鼠 标等等)、 输出部分 2107 (包括显示器, 比如阴极射线管 (CRT)、 液晶显 示器 (LCD)等, 和扬声器等)、 存储部分 2108 (包括硬盘等)、 通信部分 2109 (包括网络接口卡比如 LAN卡、 调制解调器等) 。 通信部分 2109 经由网络比如因特网执行通信处理。 根据需要, 驱动器 2110也可链路到 输入 /输出接口 2105。 可拆卸介质 2111比如磁盘、 光盘、 磁光盘、 半导体 存储器等等根据需要被安装在驱动器 2110上, 使得从中读出的计算机程 序根据需要被安装到存储部分 2108中。
[171] 在通过软件实现上述系列处理的情况下,从网络比如因特网或存储介 质比如可拆卸介质 2111安装构成软件的程序。
[172] 本领域的技术人员应当理解, 这种存储介盾不局限于图 21所示的其 中存储有程序、 与设备相分离地分发以向用户提供程序的可拆卸介质 2111。 可拆卸介质 2111 的例子包含磁盘(包含软盘 (注册商标):)、 光盘(包 含光盘只读存储器 (CD-ROM)和数字通用盘 (DVD))、磁光盘(包含迷你盘 (MD)(注册商标》和半导体存储器。 或者, 存储介盾可以是 ROM 2102、 存储部分 2108中包含的硬盘等等, 其中存有程序, 并且与包含它们的设 备一起被分发给用户。
[173] 本发明还提出一种存储有机器可读取的指令代码的程序产品。所述指 令代码由机器读取并执行时, 可执行上述根据本发明实施例的方法。
[174] 相应地,用于承载上述存储有机器可读取的指令代码的程序产品的存 储介质也包括在本发明的公开中。所述存储介盾包括但不限于软盘、光盘、 磁光盘、 存储卡、 存储棒等等。
[175] 在上面对本发明具体实施例的描述中, 针对一种实施方式描述和 /或 示出的特征可以用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。
[176] 应该强调, 术语 "包括 /包含" 在本文使用时指特征、 要素、 步骤或 组件的存在, 但并不排除一个或更多个其它特征、要素、 步骤或组件的存 在或附加。
[177] 此外,本发明的方法不限于按照说明书中描述的时间顺序来执行,也 可以按照其他的时间顺序地、 并行地或独立地执行。 因此, 本说明书中描 述的方法的执行顺序不对本发明的技术范围构成限制。
[178] 尽管上面已经通过对本发明的具体实施例的描述对本发明进行了披 露, 但是, 应该理解, 上述的所有实施例和示例均是示例性的, 而非限制 性的。本领域的技术人员可在所附权利要求的精神和范围内设计对本发明 的各种修改、 改进或者等同物。 这些修改、 改进或者等同物也应当被认为 包括在本发明的保护范围内。

Claims

权利 要求 书
1. 一种在通信系统中切换小区的方法, 其中所述通信系统支持载波 汇聚, 所述在通信系统中切换小区的方法包括:
所述通信系统中的源基站判断为其所服务的、要进行小区切换的终端 选择的从属于目的基站的一个或更多个待接入小区所对应的载波单元是 否位于同一频带内, 若是, 则将所述一个或更多个待接入小区中的所有小 区的配置信息封装于用于发起小区切换的切换命令中; 否则,将所述一个 或更多个待接入小区中的一个或更多个的配置信息封装于所述切换命令 中; 以及
向所述目的基站发送所述切换命令。
2. 如权利要求 1所述的在通信系统中切换小区的方法, 还包括: 从所述一个或更多个待接入小区中选择一个作为主待接入小区,并且 其中,将所述一个或更多个待接入小区中的一个或更多个的配置信息 封装于所述切换命令中包括:将所述主待接入小区的配置信息封装于所述 切换命令中。
3. 如权利要求 2所述的在通信系统中切换小区的方法, 其中, 从所 述一个或更多个待接入小区中选择一个作为主待接入小区包括:
判断所述一个或更多个待接入小区中是否存在所对应的载波单元与 所述终端的当前服务小区所对应的载波单元位于同一频带内的小区, 若 是, 则选择该小区作为主待接入小区, 否则, 则选择所述一个或更多个待 接入小区中性能最好的一个作为主待接入小区。
4. 如权利要求 2所述的在通信系统中切换小区的方法, 其中, 从所 述一个或更多个待接入小区中选择一个作为主待接入小区包括:
选择所述一个或更多个待接入小区中性能最好的一个,作为主待接入 小区。
5. 如权利要求 1 所述的在通信系统中切换小区的方法, 其中, 若所 述终端当前接入到所述源基站的多个小区, 则在切换到所述目的基站之 前, 所述终端保持与当前接入到的多个小区中的一个的通信。
6. 如权利要求 1所述的在通信系统中切换小区的方法, 还包括: 所述源基站根据从所述终端发送的对一个或更多个邻居小区的性能 测量 4艮告,从与所述一个或更多个邻居小区对应的一个或更多个候选基站 中选择一个作为目的基站, 以及
从所述一个或更多个邻居小区中的从属于所述目的基站的所有小区 中选择所述终端的一个或更多个待接入小区。
7. 如权利要求 6所述的在通信系统中切换小区的方法, 其中, 从所 述一个或更多个候选基站中选择一个作为目的基站包括:
基于所述一个或更多个候选基站的载波汇聚方式,并根据所述性能测 量报告,来选择适应于所述载波汇聚方式的算法来计算所述一个或更多个 候选基站的优先级; 及
从所述一个或更多个候选基站中选择优先级最高的一个,作为目的基 站。
8. 如权利要求 7所述的在通信系统中切换小区的方法, 其中, 计算 所述一个或更多个候选基站的优先级包括:
判断所述一个或更多个邻居小区中从属于同一候选基站的所有邻居 小区所对应的载波单元是否位于同一频带内; 若是, 则根据从属于该候选 基站的所有邻居小区的性能来计算该候选基站的优先级; 若否, 则根据从 属于该候选基站的所有邻居小区中性能最好的一个的性能来确定该候选 基站的优先级。
9. 如权利要求 8所述的在通信系统中切换小区的方法, 其中, 根据 从属于该候选基站的所有邻居小区的性能来计算该候选基站的优先级包 括: 根据所述性能测量报告,计算从属于该候选基站的所有邻居小区的性 之和或者加权性能之和, 作为该候选基站的优先级。
10.—种小区切换设备,设置于支持载波汇聚的通信系统中的基站中, 包括:
命令形成装置,用于确定所述基站为其所服务的、要进行小区切换的 终端选择的从属于目的基站的一个或更多个待接入小区所对应的载波单 元是否位于同一频带内, 若是, 则将所述一个或更多个待接入小区中的所 有小区的配置信息封装于用于发起小区切换的切换命令中; 否则, 将所述 以或更多个待接入小区中的一个或更多个的配置信息封装于所述切换命 令中; 以及
发送装置, 用于向所述目的基站发送所述切换命令。
11. 如权利要求 10所述的小区切换设备, 还包括主小区选择装置, 用从所述一个或更多个待接入小区中选择一个作为主待接入小区,并输出 给所述命令形成装置。
12. 如权利要求 11 所述的小区切换设备, 其中, 所述主小区选择装 置还被配置用于通过以下来选择所述主待接入小区:
判断所述一个或更多个待接入小区中是否存在所对应的载波单元与 所述终端的当前服务小区所对应的载波单元位于同一频带内的小区, 若 是, 则选择该小区作为主待接入小区, 否则, 则选择所述一个或更多个待 接入小区中的性能最好的一个作为主待接入小区。
13. 如权利要求 11 所述的小区切换设备, 其中, 所述主小区选择装 置还被配置用于通过以下来选择所述主待接入小区:
选择所述一个或更多个待接入小区中性能最好的一个作为主待接入 小区。
14. 如权利要求 10所述的小区切换设备, 其中, 若所述终端当前接 入到所述基站的多个小区,则所述基站还被配置用于指示所述终端在切换 到所述目的基站之前保持与当前接入到的多个小区中的一个的通信。
15. 如权利要求 10所述的小区切换设备, 还包括:
接收装置,用于接收所述终端发送的对一个或更多个邻居小区的性能 测量 4艮告;
目的基站选择装置,用于根据所述性能测量报告从与所述一个或更多 个邻居小区对应的一个或更多个候选基站中选择一个作为所述目的基站; 以及
小区选择装置,用于从所述一个或更多个邻居小区中从属于所述目的 基站的所有小区中选择所述终端的一个或更多个待接入小区。
16. 如权利要求 15所述的小区切换设备, 还包括优先级确定装置, 其中:
优先级确定装置用于根据所述一个或更多个候选基站的载波汇聚方 式,选择适应于所述载波汇聚方式的算法来计算所述一个或更多个候选基 站的优先级;
所述目的基站选择装置被配置用于根据所述优先级从所述一个或更 多个候选基站中选择优先级最高的一个, 作为所述目的基站。
17. 如权利要求 16所述的小区切换设备, 其中, 所述优先级确定装 置被配置用于通过以下来计算所述一个或更多个候选基站的优先级:
判断所述一个或更多个邻居小区中从属于同一候选基站的邻居小区 所对应的载波单元是否位于同一频带内; 若是, 则根据所述一个或更多个 邻居小区中从属于该候选基站的所有邻居小区的性能来计算该候选基站 的优先级; 若否, 则根据从属于该候选基站的所有邻居小区中性能最好的 一个的性能来确定该候选基站的优先级。
18. 如权利要求 17所述的小区切换设备, 其中, 所述优先级确定装 置被配置用于: 根据所述性能测量报告,计算从属于候选基站的所有邻居 小区的性能之和或者加权性能之和, 作为该候选基站的优先级。
19. 一种通信系统中的基站, 其中所述通信系统支持载波汇聚, 所述 基站包括如权利要求 10-18中的任一项所述的小区切换设备。
20. 一种通信系统, 所述通信系统支持载波汇聚, 包括如权利要求 19 所述的基站。
PCT/CN2011/075073 2010-07-27 2011-06-01 支持载波汇聚的通信系统中切换小区的方法、设备和系统 WO2012013090A1 (zh)

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