WO2012016455A1 - 一种协作多点传输系统及选择主小区的方法 - Google Patents

一种协作多点传输系统及选择主小区的方法 Download PDF

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Publication number
WO2012016455A1
WO2012016455A1 PCT/CN2011/073197 CN2011073197W WO2012016455A1 WO 2012016455 A1 WO2012016455 A1 WO 2012016455A1 CN 2011073197 W CN2011073197 W CN 2011073197W WO 2012016455 A1 WO2012016455 A1 WO 2012016455A1
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cell
primary cell
enb
mode
primary
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PCT/CN2011/073197
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English (en)
French (fr)
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汪长娥
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中兴通讯股份有限公司
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Publication of WO2012016455A1 publication Critical patent/WO2012016455A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to a coordinated multipoint transmission technique in wireless communication, and more particularly to a coordinated multipoint transmission system and a method of selecting a primary cell. Background technique
  • Coordinated multi-point transmission (CoMP) technology is a technology generated to improve the throughput of edge users. Especially when the user equipment (UE, User Equipment) is at the cell edge, the UE will use multiple Carriers communicate to increase the throughput of edge users, increase operator revenue, and improve user experience.
  • a network node includes an evolved base station (eNB, Evolved Node B) and an access point (AP, Access point); each eNB manages one or more cells, and each cell may be dispersed or distributed in a centralized manner.
  • a UE may have multiple cells serving at the same time. These cells may belong to the same eNB or may belong to different eNBs. Since the UE is in communication with a plurality of cells, one of the plurality of cells serves as a master cell to perform main control on the radio link establishment and reconfiguration of the UE, where the cell is the primary cell and the remaining cells As a secondary cell.
  • the primary cell provides basic services and centralized services for the UE, while the secondary cell provides enhanced services and distributed services for the UE.
  • the main object of the present invention is to provide a CoMP system and a method for selecting a primary cell, which can solve the important problem that the CoMP system determines the primary cell in multiple cells, and can make the selection of the primary cell more reasonable and fully utilize. system resource.
  • a method for selecting a primary cell in a CoMP system provided by the present invention, the method includes:
  • the eNB determines the initially accessed cell as the primary cell
  • the eNB where the primary cell is located determines the new primary cell according to the primary cell selection mode in all cells that have a service connection with the UE.
  • the primary cell selection mode includes: a contention mode and an assignment mode;
  • the contention mode is: the eNB of the current primary cell collects real-time statistics of the satisfaction degree of all the cells connected to the UE to the decision rule, and selects The cell that best satisfies the decision rule is a new primary cell;
  • the assignment mode is: the eNB where the primary cell is located to assign the newly accessed cell as the primary cell, or the eNB where the current primary cell is located, and randomly assigns one cell to the new primary cell in all the cells that have service connection with the UE.
  • the determining the new primary cell according to the primary cell selection mode is: the eNB of the current primary cell acquires the UE through the measurement report of the UE.
  • the signal quality of the cell to which the service is connected selects the cell in which the signal quality is the best as the new primary cell.
  • the determining the new primary cell according to the primary cell selection mode is: the eNB where the primary cell is located acquires the UE through the S1 or X2 interface.
  • the load of the eNB of the cell with the service connection selects the cell with the lowest load value including itself as the new primary cell.
  • the determining the new primary cell according to the primary cell selection mode is: Obtaining a signal quality S(i) of a cell that has a service connection with the UE, and acquiring, by using an S1 or X2 interface, a load condition L(i) of an eNB of a cell that has a service connection with the UE;
  • the selection factor C(i) is the difference between S(i) and L(i); the eNB where the current primary cell is located selects C(i) The cell with the largest value is the primary cell.
  • the determining the new primary cell according to the primary cell selection mode is: before the eNB of the current primary cell releases the connection with the UE, The time of the service interaction between the eNB and the UE where the cell with the UE is connected to the UE is counted, and the cell with the longest service interaction time is selected as the new primary cell.
  • the primary cell selection mode is a mode for designating a newly accessed cell as a primary cell
  • the determining, by the primary cell selection mode, a new primary cell is: when the UE newly accesses a cell, the current primary cell
  • the eNB that the eNB specifies to newly access is the new primary cell.
  • the present invention provides a CoMP system, the system includes: a UE, an eNB;
  • the UE is configured to notify the eNB where the cell that is initially accessed needs to initiate a service in another cell; when the eNB is used to notify the eNB of the cell that is initially accessed by the UE, when the UE is notified that it needs to initiate a service in another cell,
  • the initially accessed cell is determined to be the primary cell; when the current primary cell is located in the eNB, the new primary cell is determined according to the primary cell selection mode in all cells that have service connectivity with the UE.
  • the primary cell selection mode is a contention mode
  • the decision rule is a signal quality.
  • the eNB is the eNB of the current primary cell
  • the eNB obtains a cell that has a service connection with the UE by using the measurement report of the UE.
  • Signal quality select the cell with the best signal quality as the new primary cell;
  • the UE is further configured to measure the signal quality of the cell with the service connection, and report the signal to the eNB where the current primary cell is located.
  • the primary cell selection mode is a contention mode
  • the decision rule is a cell load situation.
  • the eNB acquires a service connection with the UE through the S1 or X2 interface.
  • the cell with the lowest load value is selected as the new primary cell.
  • the primary cell selection mode is a contention mode
  • the decision rule is a signal quality and a cell load condition.
  • the signal quality S ( i ) of the connected cell acquires the load condition L ( i ) of the eNB of the cell having the service connection with the UE through the SI or X2 interface; selects each cell according to S ( i ) and L ( i )
  • the selection factor C ( i ) is the difference between S ( i ) and L ( i )
  • the eNB in which the current primary cell is located selects the cell with the largest C ( i ) value as the new primary cell.
  • the primary cell selection mode is a contention mode
  • the rule of the rule is a service interaction time.
  • the eNB is the eNB where the current primary cell is located
  • the eNB separately counts with the UE before releasing the connection with the UE.
  • the eNB in which the service is connected is in the service interaction with the UE, the cell with the longest service interaction time is the new primary cell.
  • the primary cell selection mode is an assignment mode in which the newly-connected cell is the primary cell, and when the eNB is the eNB of the current primary cell when the UE newly accesses a cell, the eNB specifies a new mode.
  • the accessed cell is a new primary cell.
  • the method of the present invention provides a CoMP system and a method for selecting a primary cell.
  • the UE notifies the eNB of the initially accessed cell that the other cell needs to initiate a service
  • the eNB determines the initially accessed cell as the primary cell;
  • the eNB where the cell is located determines a new primary cell according to the primary cell selection mode in all cells that have a service connection with the UE; thus, the important problem that the CoMP system decides the primary cell in multiple cells can be solved, and the selection of the primary cell can be further improved.
  • Reasonable charged By utilizing system resources, the satisfaction of users' feelings is improved, and the interests of operators are also guaranteed.
  • FIG. 1 is a schematic flowchart of a method for selecting a primary cell in a CoMP system according to the present invention
  • FIG. 2 is a schematic structural diagram of a CoMP system implemented by the present invention
  • FIG. 3 is a schematic structural diagram of a CoMP system according to Embodiments 1, 2, and 3 of the present invention
  • FIG. 4 is a schematic flowchart of a method for selecting a primary cell in a CoMP system according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart of a method for implementing a primary cell in a CoMP system according to Embodiment 2 of the present invention
  • FIG. 6 is a schematic flowchart of a method for implementing a primary cell in a CoMP system according to Embodiment 3 of the present invention.
  • FIG. 7 is a schematic structural diagram of a CoMP system according to Embodiments 4, 5, and 6 of the present invention
  • FIG. 8 is a schematic flowchart of a method for selecting a primary cell in a CoMP system according to Embodiment 4 of the present invention
  • FIG. 9 is a schematic flowchart of a method for implementing a primary cell in a CoMP system according to Embodiment 5 of the present invention.
  • FIG. 10 is a schematic flowchart of a method for implementing a primary cell in a CoMP system according to Embodiment 6 of the present invention. detailed description
  • the basic idea of the present invention is: when the UE notifies the eNB where the initially accessed cell needs to initiate a service in another cell, the eNB determines the initially accessed cell as a primary cell; The cell in which the UE has a service connection determines a new primary cell according to the primary cell selection mode.
  • the primary cell selection manner includes: a competition mode and a assignment mode;
  • the contention mode refers to:
  • the eNB of the current primary cell collects real-time statistics on the satisfaction degree of all the cells connected to the UE to the decision rule, and finally selects the cell that satisfies the decision rule as the new primary cell.
  • the primary cell may be caused to compete;
  • the decision rule may be the signal quality measured by the UE, or may be the cell load of each cell. Situation, etc.
  • the assignment mode means that the eNB in which the current primary cell is located assigns the newly accessed cell as the primary cell, or the eNB in which the current primary cell is located randomly assigns one cell to the new primary cell in all the cells that have service connection with the UE.
  • the present invention implements a method for selecting a primary cell in a CoMP system. As shown in FIG. 1, the method includes the following steps:
  • Step 101 The UE initially accesses a cell, and successfully initiates a service.
  • Step 102 When the UE needs to initiate a service in another cell, report the measurement result of the other cell to the eNB where the initially accessed cell is located;
  • the measurement result includes signal quality, load condition, and the like.
  • Step 103 After receiving the measurement result of the other cell reported by the UE, when the measurement result meets the access condition, the eNB determines the initially accessed cell as the primary cell, and notifies the UE. Accessing the other cells;
  • the eNB determines the initially accessed cell as the primary cell, that is, the eNB controls the process of establishing and reconfiguring the radio link of the UE, and provides basic services and centralized services for the UE.
  • Step 104 When the UE performs service communication with two or more cells, the eNB where the current primary cell is located determines a new primary cell according to the primary cell selection manner in all cells that have service connection with the UE;
  • the primary cell selection mode is a contention mode and a decision rule is a signal quality
  • the eNB of the former primary cell obtains the signal quality of the cell that has the service connection with the UE through the measurement of the UE, and selects the cell with the best signal quality as the new primary cell, that is, the eNB of the current primary cell to the UE and the UE
  • the eNB of the cell with the service connection sends the primary cell change information
  • the primary cell change information includes indication information indicating that the cell with the best signal quality is the primary cell, and the like;
  • the eNB of the cell with the best signal quality controls the process of establishing and reconfiguring the radio link of the UE according to the indication information therein, and provides basic services and centralized services for the UE;
  • the eNB of the UE and another cell that has a service connection with the UE obtains the changed primary cell according to the indication information therein, and returns an acknowledgement message; when the signal quality of the current primary cell is optimal, The change of the primary cell is not performed.
  • the eNB of the current primary cell acquires the load of the eNB of the cell that has the service connection with the UE through the S1 or X2 interface, and the selection includes itself.
  • the cell with the lowest load value is the new primary cell, that is, when the current primary cell load value is not the lowest, the eNB of the current primary cell sends the primary cell change information to the UE and the eNB of the cell that has the service connection with the UE.
  • the primary cell change information includes indication information indicating that the cell with the lowest load value is the primary cell, and the like;
  • the eNB of the cell with the lowest load value controls the process of establishing and reconfiguring the radio link of the UE according to the indication information therein, and provides basic services and centralized services for the UE;
  • the eNB of the UE and another cell that has a service connection with the UE obtains the changed primary cell according to the indication information therein, and returns an acknowledgement message; when the current primary cell load value is the lowest, The change of the primary cell is performed.
  • the eNB of the current primary cell obtains the signal quality of the cell that has the service connection with the UE through the measurement of the UE.
  • S ( i ) indicates that the larger the value, the better the signal quality, the positive factor, and the negative of the eNB of the cell having the service connection with the UE through the S1 or X2 interface.
  • the eNB in which the current primary cell is located selects the cell with the largest C (i) value as the new primary cell, that is, when the C (i) value of the current primary cell is not the maximum, the eNB of the current primary cell has a service to the UE and the UE.
  • the eNB of the connected cell transmits primary cell change information, and the primary cell change information includes indication information indicating that the cell having the largest C (i) value is the primary cell, and the like;
  • the eNB of the cell with the largest C (i) value controls the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services for the UE.
  • the centralized eNB receives the primary cell change information from the UE and the eNB of another cell that has a service connection with the UE, and obtains the changed primary cell according to the indication information therein, and returns a confirmation message.
  • the primary cell selection mode is a method for designating a newly accessed cell as a primary cell, and when the UE newly accesses a cell, the eNB of the current primary cell receives the measurement report of the newly accessed cell by the UE. After that, the cell that is newly accessed is the new primary cell, that is, the eNB of the current primary cell sends the primary cell change information to the UE and the eNB of the cell that has the service connection with the UE, and the primary cell change information includes the latest access indication.
  • the eNB of the newly accessed cell controls the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services and centralized services for the UE;
  • the eNB of the UE and another cell having a service connection with the UE obtains the changed primary cell according to the indication information therein, and returns a confirmation message.
  • the present invention further provides a CoMP system, as shown in FIG. 2, the system includes: a UE, an eNB;
  • the UE is configured to notify the eNB where the initially accessed cell needs to initiate a service in another cell, and then perform service connection with two or more cells at the same time;
  • the eNB is configured to determine, when the eNB of the cell that is initially accessed by the UE, needs to notify the other cell to initiate the service, and determine the initially accessed cell as the primary cell; Determining a new primary cell according to a primary cell selection manner in a cell having a service connection with the UE;
  • the primary cell selection mode is a contention mode
  • the decision rule is a signal quality
  • the eNB when the eNB is the eNB where the current primary cell is located, the eNB obtains a cell that has a service connection with the UE by using the measurement report of the UE.
  • Signal quality selecting a cell in which the signal quality is the best as a new primary cell, that is, the eNB sends primary cell change information to the UE and an eNB of a cell that has a service connection with the UE, where the primary cell change information includes the indication The indication information of the cell with the best signal quality as the primary cell;
  • the eNB of the cell with the best signal quality After receiving the primary cell change information, the eNB of the cell with the best signal quality performs main control on the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services and centralized services for the UE. After receiving the primary cell change information, the eNB of the UE and another cell that has a service connection with the UE obtains the changed primary cell according to the indication information therein, and returns a confirmation message;
  • the UE is further configured to measure the signal quality of the cell with the service connection, and report the signal to the eNB where the current primary cell is located.
  • the primary cell selection mode is the contention mode and the decision rule is the cell load condition
  • the eNB acquires the eNB of the cell that has the service connection with the UE through the S1 or X2 interface.
  • the cell with the lowest load value is selected as the new primary cell, that is, when the current primary cell load value is not the lowest
  • the eNB sends the primary cell change information to the UE and the eNB of the cell that has the service connection with the UE.
  • the primary cell change information includes indication information indicating that the cell with the lowest load value is the primary cell, and the like;
  • the eNB of the cell with the lowest load value After receiving the primary cell change information, the eNB of the cell with the lowest load value performs main control on the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides the UE with the main control.
  • the basic service and the centralized service after receiving the primary cell change information, the UE and the eNB of another cell that has a service connection with the UE, according to the indication information, learn the changed primary cell and return a confirmation message.
  • the primary cell selection mode is the contention mode
  • the decision rule is the signal quality and the cell load condition
  • the eNB acquires the cell that has the service connection with the UE by using the measurement report of the UE.
  • the signal quality, represented by S (i), the larger the value, the better the signal quality, the positive factor, and the load of the eNB of the cell that has service connection with the UE through the S1 or X2 interface, by L (i) It indicates that the larger the value is, the larger the load is, and the negative factor is, the selection factor is calculated for each cell, that is, the selection factor C (i) S (i) - L (i); the eNB of the current primary cell is selected
  • the cell with the largest value of C (i) is the new primary cell, that is, when the C (i) value of the current primary cell is not the maximum, the eNB of the current primary cell sends the primary cell to the eNB of the UE and the cell with the service connection with the UE.
  • Change information, the primary cell change information includes indication information indicating that the cell having the largest C (i) value is the primary cell, and the like;
  • the eNB of the cell with the largest C (i) value When the eNB of the cell with the largest C (i) value receives the primary cell change information, it performs primary control on the process of establishing and reconfiguring the radio link of the UE according to the indication information therein, and provides basic services for the UE. And the centralized service; after receiving the primary cell change information, the eNB of the UE and another cell that has a service connection with the UE obtains the changed primary cell according to the indication information therein, and returns a confirmation message;
  • the UE is further configured to measure the signal quality of the cell with the service connection, and report the signal to the eNB where the current primary cell is located.
  • the primary cell selection mode is the contention mode and the decision rule is the service interaction time
  • the eNB of the current primary cell before the connection with the UE is released, separately counts the eNB of the cell with the service connection between the UE and the UE to perform service interaction.
  • Time the cell with the longest service interaction time is selected as the new primary cell; the time of the service interaction is generally that the eNB that is accessed first performs service interaction with the UE longer than the eNB that accesses the UE performs service with the UE. The time of interaction.
  • the primary cell selection mode is the assignment mode of the cell to which the newly accessed cell is the primary cell
  • the UE accesses a cell
  • the eNB is the eNB where the current primary cell is located
  • the eNB receives the UE pair.
  • the newly-received cell is designated as the new primary cell, that is, the eNB of the current primary cell sends the primary cell change information to the UE and the eNB of the cell that has the service connection with the UE, and the primary cell
  • the change information includes indication information indicating that the newly accessed cell is the primary cell, and the like;
  • the eNB of the newly accessed cell controls the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services and centralized services for the UE;
  • the eNB of the UE and another cell having a service connection with the UE obtains the changed primary cell according to the indication information therein, and returns a confirmation message.
  • the primary cell selection mode is the contention mode
  • the decision rule is the signal quality.
  • FIG. 3 there is one cell on the eNB1 and the eNB2 respectively.
  • the present invention implements a method for selecting a primary cell in a CoMP system, as shown in FIG. As shown, the method includes the following steps:
  • Step 401 The UE initially accesses a cell on the eNB1 and successfully initiates a service.
  • Step 402 When the UE needs to initiate a service on the cell on the eNB2, the measurement result of the cell on the eNB2 is sent to the eNB1.
  • the measurement result includes signal quality, load condition, and the like.
  • Step 403 After receiving the measurement result of the cell on the eNB2 reported by the UE, when the measurement result satisfies the access condition, the eNB1 uses its own cell as the primary cell, and notifies the UE to access the cell on the eNB2;
  • the eNB1 uses its own cell as the primary cell, that is, the eNB1 controls the radio link establishment and reconfiguration of the UE, and provides basic services and centralized for the UE. Service.
  • Step 404 When the UE performs service communication with the cell on the eNB1 and the eNB2, the eNB1 obtains the signal quality of the cell on the eNB1 and the eNB2 by using the measurement report of the UE, and selects the cell with the best signal quality as the new primary cell;
  • the primary cell change information includes indication information indicating that the cell on the eNB 2 is the primary cell, and the eNB 2 receives the primary cell change information, and establishes, according to the indication information, the radio link establishment of the UE,
  • the process of reconfiguration is controlled to provide basic services and centralized services for the UE.
  • the UE learns that the changed primary cell is eNB2 and returns an acknowledgement message according to the indication information in the primary cell change information.
  • the eNB1 is changed to the secondary cell to provide the UE with the secondary cell.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the primary cell selection mode is a contention mode
  • the decision rule is a load condition.
  • each of the eNB1 and the eNB2 has a cell.
  • the present invention implements a method for selecting a primary cell in a CoMP system, as shown in FIG. 5. As shown, the method includes the following steps:
  • Step 501 The UE initially accesses a cell on the eNB1 and successfully initiates a service.
  • Step 502 When the UE needs to initiate a service on the cell on the eNB2, the measurement result of the cell on the eNB2 is sent to the eNB1.
  • the measurement result includes signal quality, load condition, and the like.
  • Step 503 After receiving the measurement result of the cell on the eNB2 reported by the UE, when the measurement result satisfies the access condition, the eNB1 uses its own cell as the primary cell, and notifies the UE to access the cell on the eNB2;
  • the eNB1 uses its own cell as the primary cell, that is, the eNB1 controls the radio link establishment and reconfiguration of the UE, and provides basic services and centralized for the UE. Service.
  • Step 504 When the UE performs service communication with the cell on the eNB1 and the eNB2, the eNB1 acquires the load condition of the cell on the eNB2 through the X2 interface, and selects a cell with a low load value as the new primary cell between the cell and the cell on the eNB2. ;
  • the cell on the eNB1 is still the primary cell; if the cell load value on the eNB2 is low, the primary cell is changed to the cell on the eNB2, that is, the eNB1 is to the UE and
  • the eNB2 transmits the primary cell change information, where the primary cell change information includes indication information indicating that the cell on the eNB2 is the primary cell, and the like; after receiving the primary cell change information, the eNB2 establishes a radio link to the UE according to the indication information therein.
  • the main control is performed to provide basic services and centralized services for the UE.
  • the UE learns that the changed primary cell is the cell on the eNB2 according to the received indication information in the primary cell change information, and returns an acknowledgement message.
  • eNB1 is changed to a secondary cell to provide enhanced services and distributed services for the UE.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the primary cell selection mode is the contention mode
  • the decision rule is the information quality and the load condition.
  • FIG. 3 there is one cell on the eNB1 and the eNB2 respectively.
  • the present invention implements a method for selecting a primary cell in the CoMP system. As shown in Figure 6, the method includes the following steps:
  • Step 601 The UE initially accesses a cell on the eNB1 and successfully initiates a service.
  • Step 602 When the UE needs to initiate a service on the cell on the eNB2, the measurement result of the cell on the eNB2 is sent to the eNB1.
  • the measurement result includes signal quality, load condition, and the like.
  • Step 603 After receiving the measurement result of the cell on the eNB2 reported by the UE, when the measurement result satisfies the access condition, the eNB1 uses its own cell as the primary cell, and notifies the UE to access the cell on the eNB2.
  • the eNB1 uses its own cell as the primary cell, that is, the eNB1 controls the radio link establishment and reconfiguration of the UE, and provides basic services and centralized for the UE. Service.
  • Step 604 When the UE performs service communication with the cell on the eNB1 and the eNB2, the eNB1 obtains the signal quality of the cell on the eNB1 and the eNB2 through the measurement report of the UE, and acquires the load condition of the cell on the eNB2 through the X2 interface, in the self. Selecting a cell with the largest weighting value of the signal quality and the load condition between the cells on the eNB2 as the new primary cell;
  • the eNB1 obtains the signal quality of the cells on the eNB1 and the eNB2 by using the measurement report of the UE, and is respectively represented by S(1) and S(2), and acquires the load condition of the cell on the eNB2 through the X2 interface, by L (2).
  • L (2) indicates that the load condition of the cell on itself is represented by L ( 1), and the selection factor is calculated, that is, the selection factor C(1) of the cell on the eNB1 is S (1 )-L(1);
  • the cell selection factor C (2) S (2) - L (2); Compare the values of C (1) and C (2). If the value of C (l) is high at this time, the cell on eNB1 is still dominant.
  • the primary cell is changed to the cell on the eNB2, that is, the eNB1 transmits the primary cell change information to the UE and the eNB2, and the primary cell change information includes an indication indicating that the cell on the eNB2 is the primary cell. Information, etc.
  • the eNB2 After receiving the primary cell change information, the eNB2 controls the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services and centralized services for the UE. The UE is based on the received primary cell.
  • the indication information in the change information is learned that the changed primary cell is a cell on the eNB2, and the acknowledgment message is returned; the eNB1 is changed to the secondary cell to provide enhanced services and distributed services for the UE.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the primary cell selection mode is the contention mode
  • the decision rule is the information quality and the load condition.
  • each of the eNB1, the eNB2, and the eNB3 has a cell, and the present invention implements the selection of the primary cell in the CoMP system.
  • Method as shown in FIG. 8, the method includes the following steps:
  • Step 801 The UE has a service connection on the eNB1 and the eNB2, and the eNB1 is the UE. Front main cell;
  • Step 802 When the UE needs to initiate a service on the cell on the eNB3, the measurement result of the cell on the eNB3 is sent to the eNB1;
  • the measurement result includes signal quality, load condition, and the like.
  • Step 803 After receiving the measurement result of the cell on the eNB2 reported by the UE, the eNB1 notifies the UE to access the cell on the eNB3 when the measurement result satisfies the access condition;
  • Step 804 The eNB1 obtains the signal quality of the cells on the eNB1, the eNB2, and the eNB3 by using the measurement report of the UE, and acquires the load condition of the cell on the eNB2 and the eNB3 through the X2 interface, and selects the signal quality between the cell on the eNB2 and the eNB3.
  • the cell with the largest weighting value of the load condition is used as the new primary cell;
  • the eNB 1 obtains the signal quality of the cells on the eNB 1, the eNB 2, and the eNB 3 by using the measurement of the UE, and is represented by S ( l), S ( 2 ), and S ( 3 ) respectively, and acquires the eNB 2 through the X2 interface.
  • the load condition of the cell on the eNB3 is represented by L (2) and L (3), respectively, and the load condition of the cell on the eNB3 is represented by L ( l ), and the selection factor is calculated, that is, the cell selection on the eNB1
  • the factor C(1) S(1) - L(1)
  • the selection factor C(2) S(2) - L(2) of the cell on eNB2
  • the selection factor C(3) of the cell on eNB3 S (3) - L (3); Compare the values of C ( 1), C (2), C (3).
  • C ( 1 ) If the value of C ( 1 ) is the highest at this time, the cell on eNB1 is still the primary cell; (2) If the value is the highest, the primary cell is changed to the cell on eNB2; if the C(3) value is the highest, the primary cell is changed to the cell on eNB3.
  • the method further includes: if the cell on the eNB1 is still the primary cell, when the service on the eNB1 needs to be released, the eNB1 reacquires S (2), S (3), and L (2) before releasing the connection with the UE.
  • the primary cell change information includes a finger indicating that the cell on the eNB2 is the primary cell.
  • the eNB2 controls the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services and centralized services for the UE;
  • the eNB3 learns that the changed primary cell is the cell on the eNB2 according to the received indication information in the primary cell change information, and returns an acknowledgement message;
  • the eNB 1 releases and leaves the cell list associated with the UE; if the C(3) value is the highest,
  • the primary cell is changed to the cell on the eNB3, that is, the eNB1 transmits the primary cell change information to the UE, the eNB2, and the eNB3, and the primary cell change information includes indication information indicating that the cell on the eNB3 is the primary cell, and the like, and the eNB3 receives the primary information.
  • the process of the radio link establishment and reconfiguration of the UE is controlled to provide basic services and centralized services for the UE; the UE and the eNB2 according to the received primary cell change information.
  • the indication information is that the changed primary cell is a cell on the eNB3, and returns an acknowledgement message; the eNB1 releases and leaves the cell list associated with the UE.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • the primary cell selection mode is a contention mode
  • the rule is a service interaction time.
  • eNB1, eNB2, and eNB3 respectively have one cell, and the present invention implements a method for selecting a primary cell in a CoMP system. As shown in Figure 9, the method includes the following steps:
  • Step 901 The UE has a service connection on the eNB1, the eNB2, and the eNB3, and the cell on the eNB1 is the current primary cell of the UE;
  • Step 902 When the service on the eNB1 needs to be released, the eNB1 separately counts the time for the eNB2 and the eNB3 to perform service interaction with the UE, and selects the cell with a longer service interaction time as the new primary cell.
  • the eNB1 separately counts the time for the eNB2 and the eNB3 to perform service interaction with the UE.
  • the UE reports the access sequence with the eNB2 and the eNB3 to the eNB1, and the eNB that accesses the first time performs service interaction with the UE for longer than the eNB1. For example, if the eNB that the UE accesses before is the eNB2, the eNB1 sends the primary cell change information to the UE, the eNB2, and the eNB3, where the primary cell change information includes the indication eNB2.
  • the eNB2 controls the radio link establishment and reconfiguration process of the UE according to the indication information therein, and provides basic services and centralized services for the UE; And the eNB3 learns that the changed primary cell is the cell on the eNB2 according to the received indication information in the primary cell change information, and returns an acknowledgement message; the eNB1 releases and leaves the cell list associated with the UE.
  • the primary cell selection mode is a method for designating a newly-accessed cell as a primary cell.
  • each of the eNB1, the eNB2, and the eNB3 has a cell, and the present invention implements the cell when the UE newly accesses the cell on the eNB3.
  • a method of selecting a primary cell in a CoMP system as shown in FIG. 10, the method includes the following steps:
  • Step S101 The UE has a service connection on the eNB1 and the eNB2, and the eNB1 is the current primary cell of the UE;
  • Step S102 When the UE needs to initiate a service on the eNB3, the measurement result of the cell on the eNB3 is reported to the eNB1;
  • Step SI 03 After receiving the measurement report of the new access cell by the UE, the eNB1 specifies that the cell on the newly accessed eNB3 is the new primary cell;
  • the eNB 1 after receiving the measurement report of the cell on the newly accessed eNB3, the eNB 1 notifies the UE to access the cell on the eNB3 when the measurement result satisfies the access condition; the eNB1 sends the main message to the UE, the eNB2, and the eNB3.
  • the cell change information, the primary cell change information includes indication information indicating that the cell on the eNB3 is the primary cell, and the like; after receiving the primary cell change information, the eNB3 establishes, according to the indication information, the radio link establishment of the UE, The re-matching process is performed to provide basic services and centralized services for the UE.
  • the UE and the eNB 2 learn that the changed primary cell is the eNB3 and return an acknowledgement message according to the indication information therein; Change to a secondary cell to provide enhanced services and distributed services for the UE.
  • the decision of the primary cell in multiple cells in the CoMP system is solved Important issues, through the competition method, the main cell can be selected more reasonably, and the resources of the system can be fully utilized, which improves the satisfaction of the user experience and ensures the interests of the operator.

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Abstract

本发明公开了一种协作多点传输（CoMP）系统中选择主小区的方法，当用户设备（UE）向初始接入的小区所在演进基站（eNB）通知需要在其他小区发起业务时，所述eNB将所述初始接入的小区确定为主小区；当前主小区所在eNB在所有与UE有业务连接的小区中按照主小区选择方式确定新的主小区；本发明同时公开了一种CoMP系统，通过本发明的方案，可以解决CoMP系统在多个小区中决策主小区的重要问题，并可以使主小区的选择更加合理，充分利用系统资源，提高了用户感受的满意度，也保证了运营商的利益。

Description

一种协作多点传输系统及选择主小区的方法 技术领域
本发明涉及无线通信中的协作多点传输技术， 尤其涉及一种协作多点 传输系统及选择主小区的方法。 背景技术
协作多点传输 ( CoMP, Coordinated multi-point transmission )技术是为 了提高边缘用户的吞吐量而产生的一种技术， 特别在用户设备（UE, User Equipment )处于小区边缘的时候， UE将使用多个载波进行通信， 从而提 高边缘用户的吞吐量， 提高运营商的收入， 改善用户体验。 在 CoMP 系统 中， 网络节点包括演进基站（ eNB, Evolved Node B )和接入点（ AP, Access point );每一个 eNB管理一个或者多个小区，每个小区中可能以集中或者分 布式分散着一个或者多个 AP; eNB通过 AP与 UE进行连接管理。
在 CoMP系统中， 一个 UE可能有多个小区同时为其服务， 这些小区 可能属于同一个 eNB, 也可能属于不同的 eNB。 由于 UE是与多个小区进 行通信， 在这多个小区中会有一个小区作为主控小区对 UE 的无线链路建 立、 重配等过程进行主要控制， 该小区即为主小区， 余下的小区为辅小区。 主小区为 UE提供基本服务和集中式服务，而辅小区为 UE提供增强业务和 分布式服务。
当 UE只在一个小区中发起业务时， CoMP系统的处理和现有通信系统 一致，但当服务于发起业务 UE的小区为两个或两个以上时，会出现无法确 定主小区的情况，可能导致 UE陷入混乱，影响用户感受。 目前，对于 CoMP 系统中如何确定主小区还没有提出明确的解决方案。 发明内容
有鉴于此， 本发明的主要目的在于提供一种 CoMP系统及选择主小区 的方法， 能解决 CoMP 系统在多个小区中决策主小区的重要问题， 并可以 使主小区的选择更加合理， 充分利用系统资源。
为达到上述目的， 本发明的技术方案是这样实现的：
本发明提供的一种 CoMP系统中选择主小区的方法， 该方法包括：
UE向初始接入的小区所在 eNB通知需要在其他小区发起业务时， 所 述 eNB将所述初始接入的小区确定为主小区；
当前主小区所在 eNB在所有与 UE有业务连接的小区中按照主小区选 择方式确定新的主小区。
上述方案中， 所述主小区选择方式包括： 竟争方式和指派方式； 所述竟争方式为： 由当前主小区所在 eNB实时统计所有和 UE有业务 连接的小区对判决规则的满足程度， 选择最满足判决规则的小区为新的主 小区；
所述指派方式为： 当前主小区所在 eNB指派新接入的小区为主小区、 或者当前主小区所在 eNB在所有和 UE有业务连接的小区中随机指派一个 小区为新的主小区。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为信号质量 时， 所述按照主小区选择方式确定新的主小区为： 当前主小区所在 eNB通 过 UE的测量上报获取与 UE有业务连接的小区的信号质量，选择其中信号 质量最佳的小区作为新的主小区。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为小区负载 情况时，所述按照主小区选择方式确定新的主小区为： 当前主小区所在 eNB 通过 S1或 X2接口获取与 UE有业务连接的小区的 eNB的负载情况， 选择 包括自身在内的负荷值最低的小区为新的主小区。 上述方案中， 所述主小区选择方式为竟争方式、 判决规则为信号质量 与小区负载情况时， 所述按照主小区选择方式确定新的主小区为： 当前主 小区所在 eNB通过 UE的测量上报获取与 UE有业务连接的小区的信号质 量 S ( i ), 并通过 S1或 X2接口获取与 UE有业务连接的小区的 eNB的负 载情况 L ( i );
根据 S ( i )和 L ( i )对各小区进行选择因子计算， 所述选择因子 C ( i ) 为 S ( i )与 L ( i )之差； 所述当前主小区所在 eNB选择 C ( i )值最大的小 区为主小区。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为业务交互 时间时，所述按照主小区选择方式确定新的主小区为： 当前主小区所在 eNB 在释放与 UE的连接前， 分别统计与 UE有业务连接的小区所在 eNB与 UE 进行业务交互的时间， 选择业务交互时间最长的小区为新的主小区。
上述方案中， 所述主小区选择方式为指定新接入的小区为主小区的指 派方式，所述按照主小区选择方式确定新的主小区为： 在 UE新接入一个小 区时， 当前主小区所在 eNB指定新接入的小区为新的主小区。
本发明提供的一种 CoMP系统， 该系统包括： UE、 eNB; 其中，
UE, 用于向初始接入的小区所在 eNB通知需要在其他小区发起业务； eNB ,用于为 UE初始接入的小区所在 eNB时，收到 UE通知需要在其 他小区发起业务时， 将所述初始接入的小区确定为主小区； 为当前主小区 所在 eNB时， 在所有与 UE有业务连接的小区中按照主小区选择方式确定 新的主小区。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为信号质量， 则所述 eNB为当前主小区所在 eNB时，所述 eNB通过 UE的测量上报获取 与 UE有业务连接的小区的信号质量，选择其中信号质量最佳的小区作为新 的主小区； 相应的， 所述 UE, 还用于测量有业务连接的小区的信号质量， 并向当 前主小区所在 eNB上报。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为小区负载 情况， 则所述 eNB为当前主小区所在 eNB时， 所述 eNB通过 S 1或 X2接 口获取与 UE有业务连接的小区的 eNB的负载情况， 选择其中负荷值最低 的小区为新的主小区。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为信号质量 与小区负载情况， 则所述 eNB为当前主小区所在 eNB时， 所述 eNB通过 UE的测量上报获取与 UE有业务连接的小区的信号质量 S ( i ), 并通过 SI 或 X2接口获取与 UE有业务连接的小区的 eNB的负载情况 L ( i ); 根据 S ( i )和 L ( i )对各小区进行选择因子计算， 所述选择因子 C ( i )为 S ( i ) 与 L ( i )之差， 所述当前主小区所在 eNB选择 C ( i )值最大的小区为新的 主小区。
上述方案中， 所述主小区选择方式为竟争方式、 判决规则为业务交互 时间， 则所述 eNB为当前主小区所在 eNB时， 所述 eNB在释放与 UE的连 接前， 分别统计与 UE有业务连接的小区所在 eNB与 UE进行业务交互的 时间， 选择业务交互时间最长的小区为新的主小区。
上述方案中， 所述主小区选择方式为指定新接入的小区为主小区的指 派方式，则在 UE新接入一个小区时，所述 eNB为当前主小区所在 eNB时， 所述 eNB指定新接入的小区为新的主小区。
本发明提供的 CoMP系统及选择主小区的方法， 当 UE向初始接入的 小区所在 eNB通知需要在其他小区发起业务时，所述 eNB将所述初始接入 的小区确定为主小区； 当前主小区所在 eNB在所有与 UE有业务连接的小 区中按照主小区选择方式确定新的主小区； 如此， 可以解决 CoMP系统在 多个小区中决策主小区的重要问题， 并可以使主小区的选择更加合理， 充 分利用系统资源， 提高了用户感受的满意度， 也保证了运营商的利益。 附图说明
图 1为本发明实现 CoMP系统中选择主小区的方法的流程示意图； 图 2为本发明实现的 CoMP系统的结构示意图；
图 3为本发明实施例一、 二、 三中 CoMP系统的结构示意图； 图 4为本发明实施例一实现 CoMP系统中选择主小区的方法的流程示 意图；
图 5为本发明实施例二实现 CoMP系统中选择主小区的方法的流程示 意图；
图 6为本发明实施例三实现 CoMP系统中选择主小区的方法的流程示 意图；
图 7为本发明实施例四、 五、 六中 CoMP系统的结构示意图； 图 8为本发明实施例四实现 CoMP系统中选择主小区的方法的流程示 意图；
图 9为本发明实施例五实现 CoMP系统中选择主小区的方法的流程示 意图；
图 10为本发明实施例六实现 CoMP系统中选择主小区的方法的流程示 意图。 具体实施方式
本发明的基本思想是： 当 UE向初始接入的小区所在 eNB通知需要在 其他小区发起业务时， 所述 eNB将所述初始接入的小区确定为主小区； 当 前主小区所在 eNB在所有与 UE有业务连接的小区中按照主小区选择方式 确定新的主小区。
所述主小区选择方式包括： 竟争方式和指派方式； 所述竟争方式是指： 由当前主小区所在 eNB实时统计所有和 UE有业 务连接的小区对判决规则的满足程度， 最终选择最满足判决规则的小区为 新的主小区。 其中， 当各小区满足判决规则的程度发生改变或出现小区数 增减时，都可能会引发主小区竟争； 所述判决规则可以是 UE测量到的信号 质量， 也可以是各小区的小区负载情况等；
所述指派方式是指：当前主小区所在 eNB指派新接入的小区为主小区、 或者当前主小区所在 eNB在所有和 UE有业务连接的小区中随机指派一个 小区为新的主小区。
下面通过附图及具体实施例对本发明做进一步的详细说明。
本发明实现 CoMP系统中选择主小区的方法， 如图 1所示， 该方法包 括以下几个步骤：
步骤 101 : UE初始接入一个小区， 并成功发起业务；
步骤 102: 当 UE需要在其他小区发起业务时， 将所述其他小区的测量 结果上报给初始接入的小区所在 eNB;
其中， 所述测量结果包括信号质量、 负载情况等。
步骤 103: 初始接入的小区所在 eNB接收到 UE上报的其他小区的测 量结果后， 在测量结果满足接入条件时， 所述 eNB将所述初始接入的小区 确定为主小区， 并通知 UE接入所述其他小区；
本步骤中， 所述 eNB将初始接入的小区确定为主小区， 即： 所述 eNB 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中 式服务。
步骤 104: 当 UE在与两个或两个以上的小区进行业务通信时， 当前主 小区所在 eNB在所有与 UE有业务连接的小区中按照主小区选择方式确定 新的主小区；
例如， 所述主小区选择方式为竟争方式、 判决规则为信号质量时， 当 前主小区所在 eNB通过 UE的测量上 ^艮获取与 UE有业务连接的小区的信 号质量， 选择其中信号质量最佳的小区作为新的主小区， 即： 当前主小区 所在 eNB向 UE及与 UE有业务连接的小区的 eNB发送主小区变更信息， 所述主小区变更信息包括指示所述信号质量最佳的小区为主小区的指示信 息等；
当所述信号质量最佳的小区的 eNB收到主小区变更信息后， 根据其中 的指示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基 本服务和集中式服务； 所述 UE及与 UE有业务连接的其他小区的 eNB收 到主小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返回 确认消息； 在当前主小区的信号质量最佳时， 不进行主小区的变更。
再如： 所述主小区选择方式为竟争方式、 判决规则为小区负载情况时， 当前主小区所在 eNB通过 S1或 X2接口获取与 UE有业务连接的小区的 eNB 的负载情况， 选择包括自身在内的负荷值最低的小区为新的主小区， 即： 在当前主小区的负荷值不是最低时， 当前主小区所在 eNB向 UE及与 UE有业务连接的小区的 eNB发送主小区变更信息， 所述主小区变更信息 包括指示所述负荷值最低的小区为主小区的指示信息等；
当所述负荷值最低的小区的 eNB收到主小区变更信息后， 根据其中的 指示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本 服务和集中式服务； 所述 UE及与 UE有业务连接的其他小区的 eNB收到 主小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返回确 认消息； 在当前主小区的负荷值是最低时， 不进行主小区的变更。
又如： 所述主小区选择方式为竟争方式、 判决规则为信号质量与小区 负载情况时， 当前主小区所在 eNB通过 UE的测量上才艮获取与 UE有业务 连接的小区的信号质量， 由 S ( i )表示， 其值越大表示信号质量越好， 为 积极因子， 并通过 S1或 X2接口获取与 UE有业务连接的小区的 eNB的负 载情况， 由 L (i)表示， 其值越大表示负荷越大， 为消极因子， 对各小区 进行选择因子计算， 即： 选择因子 C (i) =S (i) -L (i); 所述当前主小区 所在 eNB选择 C (i)值最大的小区为新的主小区， 即： 在当前主小区的 C (i)值不是最大时， 当前主小区所在 eNB向 UE及与 UE有业务连接的小 区的 eNB发送主小区变更信息， 所述主小区变更信息包括指示所述 C (i) 值最大的小区为主小区的指示信息等；
当所述 C (i)值最大的小区的 eNB收到主小区变更信息后， 才艮据其中 的指示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基 本服务和集中式服务； 所述 UE及与 UE有业务连接的其他小区的 eNB收 到主小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返回 确认消息。
还如， 所述主小区选择方式为指定新接入的小区为主小区的指派方式， 则在 UE新接入一个小区时， 当前主小区所在 eNB在收到 UE对新接入小 区的测量上报后， 指定新接入的小区为新的主小区， 即： 当前主小区所在 eNB向 UE及与 UE有业务连接的小区的 eNB发送主小区变更信息， 所述 主小区变更信息包括指示最新接入的小区为主小区的指示信息等；
当所述最新接入的小区的 eNB收到主小区变更信息后， 根据其中的指 示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服 务和集中式服务； 所述 UE及与 UE有业务连接的其他小区的 eNB收到主 小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返回确认 消息。
为实现上述方法， 本发明还提供了一种 CoMP系统， 如图 2所示， 该 系统包括： UE、 eNB; 其中，
UE, 用于向初始接入的小区所在 eNB通知需要在其他小区发起业务， 之后同时与两个及两个以上小区进行业务连接； eNB ,用于为 UE初始接入的小区所在 eNB时，收到 UE通知需要在其 他小区发起业务时， 将所述初始接入的小区确定为主小区； 为当前主小区 所在 eNB时， 在所有与 UE有业务连接的小区中按照主小区选择方式确定 新的主小区；
具体的， 若所述主小区选择方式为竟争方式、 判决规则为信号质量， 则所述 eNB为当前主小区所在 eNB时，所述 eNB通过 UE的测量上报获取 与 UE有业务连接的小区的信号质量，选择其中信号质量最佳的小区作为新 的主小区， 即： 所述 eNB向 UE及与 UE有业务连接的小区的 eNB发送主 小区变更信息， 所述主小区变更信息包括指示所述信号质量最佳的小区为 主小区的指示信息等；
当所述信号质量最佳的小区的 eNB收到主小区变更信息后， 根据其中 的指示信息， 对 UE的无线链路建立、 重配等过程进行主要控制， 为 UE提 供基本服务和集中式服务；所述 UE及与 UE有业务连接的其他小区的 eNB 收到主小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返 回确认消息；
相应的， 所述 UE, 还用于测量有业务连接的小区的信号质量， 并向当 前主小区所在 eNB上报。
若所述主小区选择方式为竟争方式、 判决规则为小区负载情况， 则所 述 eNB为当前主小区所在 eNB时，所述 eNB通过 S1或 X2接口获取与 UE 有业务连接的小区的 eNB的负载情况， 选择其中负荷值最低的小区为新的 主小区， 即： 在当前主小区的负荷值不是最低时， 所述 eNB向 UE及与 UE 有业务连接的小区的 eNB发送主小区变更信息， 所述主小区变更信息包括 指示所述负荷值最低的小区为主小区的指示信息等；
当所述负荷值最低的小区的 eNB收到主小区变更信息后， 根据其中的 指示信息， 对 UE的无线链路建立、 重配等过程进行主要控制， 为 UE提供 基本服务和集中式服务； 所述 UE及与 UE有业务连接的其他小区的 eNB 收到主小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返 回确认消息。
若所述主小区选择方式为竟争方式、 判决规则为信号质量与小区负载 情况， 则所述 eNB为当前主小区所在 eNB时， 所述 eNB通过 UE的测量上 报获取与 UE有业务连接的小区的信号质量， 由 S (i)表示， 其值越大表 示信号质量越好， 为积极因子， 并通过 S1或 X2接口获取与 UE有业务连 接的小区的 eNB的负载情况， 由 L (i)表示， 其值越大表示负荷越大， 为 消极因子， 对各小区进行选择因子计算， 即： 选择因子 C (i) = S (i) - L (i); 所述当前主小区所在 eNB选择 C (i)值最大的小区为新的主小区， 即： 在当前主小区的 C (i)值不是最大时， 当前主小区所在 eNB向 UE及 与 UE有业务连接的小区的 eNB发送主小区变更信息， 所述主小区变更信 息包括指示所述 C (i)值最大的小区为主小区的指示信息等；
当所述 C (i)值最大的小区的 eNB收到主小区变更信息后， 才艮据其中 的指示信息， 对 UE的无线链路建立、 重配等过程进行主要控制， 为 UE提 供基本服务和集中式服务；所述 UE及与 UE有业务连接的其他小区的 eNB 收到主小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返 回确认消息；
相应的， 所述 UE, 还用于测量有业务连接的小区的信号质量， 并向当 前主小区所在 eNB上报。
若所述主小区选择方式为竟争方式、 判决规则为业务交互时间时， 当 前主小区所在 eNB在释放与 UE的连接前， 分别统计与 UE有业务连接的 小区所在 eNB与 UE进行业务交互的时间， 选择业务交互时间最长的小区 为新的主小区； 所述业务交互的时间， 一般是， 在先接入的 eNB与 UE进 行业务交互的时间长于在后接入的 eNB与 UE进行业务交互的时间。 若所述主小区选择方式为指定新接入的小区为主小区的指派方式， 则 在 UE新接入一个小区时， 所述 eNB为当前主小区所在 eNB时， 所述 eNB 在收到 UE对新接入小区的测量上报后， 指定新接入的小区为新的主小区， 即： 当前主小区所在 eNB向 UE及与 UE有业务连接的小区的 eNB发送主 小区变更信息， 所述主小区变更信息包括指示最新接入的小区为主小区的 指示信息等；
当所述最新接入的小区的 eNB收到主小区变更信息后， 根据其中的指 示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服 务和集中式服务； 所述 UE及与 UE有业务连接的其他小区的 eNB收到主 小区变更信息后， 根据其中的指示信息， 获知变更后的主小区， 返回确认 消息。 实施例一：
本实施例中， 主小区选择方式为竟争方式、 判决规则为信号质量， 如 图 3所示， eNBl和 eNB2上分别有一个小区， 本发明实现 CoMP系统中选 择主小区的方法， 如图 4所示， 该方法包括以下几个步骤：
步骤 401 : UE初始接入 eNBl上的小区并成功发起业务；
步骤 402: 当 UE需要在 eNB2上的小区发起业务时， 将所述 eNB2上 的小区的测量结果上 ^艮给 eNBl ;
其中， 所述测量结果包括信号质量、 负载情况等。
步骤 403: eNBl接收到 UE上报的 eNB2上的小区的测量结果后， 在 测量结果满足接入条件时， 所述 eNBl 将自身的小区作为主小区， 并通知 UE接入 eNB2上的小区；
本步骤中， 所述 eNBl将自身的小区作为主小区， 即： 所述 eNBl对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中式 服务。
步骤 404: 当 UE在与 eNBl和 eNB2上的小区进行业务通信时， eNBl 通过 UE的测量上报获取 eNBl和 eNB2上的小区的信号质量， 选择其中信 号质量最佳的小区作为新的主小区；
本步骤中， 若此时 eNBl小区信号质量较好， 那么 eNBl小区仍为主小 区；若此时 eNB2小区信号质量较好，则主小区变更为 eNB2小区，即： eNBl 通过 X2口向 eNB2及 UE发送主小区变更信息， 所述主小区变更信息包括 指示 eNB2上的小区为主小区的指示信息等； 所述 eNB2收到主小区变更信 息后， 根据其中的指示信息对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中式服务; UE根据主小区变更信息中的指示信息， 获知变更后的主小区为 eNB2, 返回确认消息； eNBl变更为辅小区， 为 UE 提供增强业务和分布式服务。
实施例二：
本实施例中， 主小区选择方式为竟争方式、 判决规则为负载情况， 如 图 3所示， eNBl和 eNB2上分别有一个小区， 本发明实现 CoMP系统中选 择主小区的方法， 如图 5所示， 该方法包括以下几个步骤：
步骤 501 : UE初始接入 eNBl上的小区并成功发起业务；
步骤 502: 当 UE需要在 eNB2上的小区发起业务时， 将所述 eNB2上 的小区的测量结果上 ^艮给 eNBl ;
其中， 所述测量结果包括信号质量、 负载情况等。
步骤 503: eNBl接收到 UE上报的 eNB2上的小区的测量结果后， 在 测量结果满足接入条件时， 所述 eNBl 将自身的小区作为主小区， 并通知 UE接入 eNB2上的小区；
本步骤中， 所述 eNBl将自身的小区作为主小区， 即： 所述 eNBl对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中式 服务。
步骤 504: 当 UE在与 eNBl和 eNB2上的小区进行业务通信时， eNBl 通过 X2接口获取 eNB2上的小区的负载情况， 在自身与 eNB2上的小区间 选择负荷值低的小区作为新的主小区；
本步骤中， 若此时 eNBl上的小区负荷值低， 那么 eNBl上的小区仍为 主小区；若 eNB2上的小区负荷值低，则主小区变更为 eNB2上的小区， 即： eNBl向 UE及 eNB2发送主小区变更信息， 所述主小区变更信息包括指示 eNB2上的小区为主小区的指示信息等； 当 eNB2收到主小区变更信息后， 根据其中的指示信息， 对 UE的无线链路建立、 重配等过程进行主要控制， 为 UE提供基本服务和集中式服务；所述 UE根据收到的主小区变更信息中 的指示信息，获知变更后的主小区为 eNB2上的小区，返回确认消息； eNBl 变更为辅小区， 为 UE提供增强业务和分布式服务。
实施例三：
本实施例中， 主小区选择方式为竟争方式、 判决规则为信息质量和负 载情况，如图 3所示， eNBl和 eNB2上分别有一个小区，本发明实现 CoMP 系统中选择主小区的方法， 如图 6所示， 该方法包括以下几个步骤：
步骤 601 : UE初始接入 eNBl上的小区并成功发起业务；
步骤 602: 当 UE需要在 eNB2上的小区发起业务时， 将所述 eNB2上 的小区的测量结果上 ^艮给 eNBl ;
其中， 所述测量结果包括信号质量、 负载情况等。
步骤 603: eNBl接收到 UE上报的 eNB2上的小区的测量结果后， 在 测量结果满足接入条件时， 所述 eNBl 将自身的小区作为主小区， 并通知 UE接入 eNB2上的小区；
本步骤中， 所述 eNBl将自身的小区作为主小区， 即： 所述 eNBl对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中式 服务。
步骤 604: 当 UE在与 eNBl和 eNB2上的小区进行业务通信时， eNBl 通过 UE的测量上报获取 eNBl和 eNB2上的小区的信号质量， 并通过 X2 接口获取 eNB2上的小区的负载情况，在自身与 eNB2上的小区间选择信号 质量与负载情况的加权值最大的小区作为新的主小区；
具体的 , eNBl通过 UE的测量上报获取 eNBl和 eNB2上的小区的信 号质量， 分别由 S (l )、 S (2)表示， 并通过 X2接口获取 eNB2上的小区 的负载情况， 由 L (2)表示， 其自身上的小区的负载情况由 L ( 1)表示， 进行选择因子计算， 即： eNBl上的小区的选择因子 C(1) = S (1 )-L(1); eNB2上的小区的选择因子 C (2) =S (2) -L (2); 比较 C (1)与 C (2) 的值， 若此时 C (l)值高， 那么 eNBl上的小区仍为主小区； 若 C (2)值 高， 则主小区变更为 eNB2上的小区， 即： eNBl向 UE及 eNB2发送主小 区变更信息，所述主小区变更信息包括指示 eNB2上的小区为主小区的指示 信息等；
当 eNB2收到主小区变更信息后， 根据其中的指示信息， 对 UE的无线 链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中式服务； 所述 UE 根据收到的主小区变更信息中的指示信息， 获知变更后的主小区为 eNB2上的小区， 返回确认消息； eNBl变更为辅小区， 为 UE提供增强业 务和分布式服务。
实施例四：
本实施例中， 主小区选择方式为竟争方式、 判决规则为信息质量和负 载情况， 如图 7所示， eNBl、 eNB2和 eNB3上分别有一个小区， 本发明实 现 CoMP系统中选择主小区的方法， 如图 8所示， 该方法包括以下几个步 骤：
步骤 801: UE在 eNBl和 eNB2上均有业务连接， 且 eNBl为 UE的当 前主小区；
步骤 802: 当 UE需要在 eNB3上的小区发起业务时， 将所述 eNB3上 的小区的测量结果上 ^艮给 eNBl;
其中， 所述测量结果包括信号质量、 负载情况等。
步骤 803: eNBl接收到 UE上报的 eNB2上的小区的测量结果后， 在 测量结果满足接入条件时， 通知 UE接入 eNB3上的小区；
步骤 804: eNBl通过 UE的测量上报获取 eNBl、 eNB2和 eNB3上的 小区的信号质量， 并通过 X2接口获取 eNB2、 eNB3上的小区的负载情况， 在自身与 eNB2、 eNB3上的小区间选择信号质量与负载情况的加权值最大 的小区作为新的主小区；
具体的， eNB 1通过 UE的测量上 ^艮获取 eNB 1、 eNB2和 eNB3上的小 区的信号质量， 分别由 S ( l)、 S (2)、 S (3)表示， 并通过 X2接口获取 eNB2、 eNB3上的小区的负载情况， 分别由 L (2)、 L (3)表示， 其自身上 的小区的负载情况由 L ( l )表示， 进行选择因子计算， 即： eNBl 上的小 区的选择因子 C ( 1 ) =S ( 1 ) -L ( 1 ); eNB2上的小区的选择因子 C (2) = S ( 2 ) - L ( 2 ); eNB3上的小区的选择因子 C (3) = S (3) - L (3); 比 较 C ( 1)、 C (2)、 C (3) 的值， 若此时 C ( 1 )值最高， 那么 eNBl上的 小区仍为主小区； 若 C (2)值最高， 则主小区变更为 eNB2上的小区； 若 C (3)值最高， 则主小区变更为 eNB3上的小区。
本步骤中， 进一步包括： 若 eNBl上的小区仍为主小区， 当 eNBl上的 业务需要释放时， eNBl在释放与 UE的连接前重新获取 S (2)、 S ( 3 )、 L (2)、 L (3) 的值， 并计算出 C (2)、 C (3) 的值， 将本小区的选择因子 C ( 1 )置为最小值。 比较 C ( 1)、 C (2)、 C (3)的值， 若 C (2)值最高， 则主小区变更为 eNB2上的小区， 即： eNBl向 UE及 eNB2、 eNB3发送主 小区变更信息，所述主小区变更信息包括指示 eNB2上的小区为主小区的指 示信息等， 当 eNB2收到主小区变更信息后， 才艮据其中的指示信息， 对 UE 的无线链路建立、重配等过程进行控制，为 UE提供基本服务和集中式服务； 所述 UE和 eNB3根据收到的主小区变更信息中的指示信息，获知变更后的 主小区为 eNB2上的小区， 返回确认消息； eNB 1释放并离开 UE关联的小 区列表； 若 C ( 3 )值最高， 则主小区变更为 eNB3 上的小区， 即： eNBl 向 UE及 eNB2、 eNB3发送主小区变更信息， 所述主小区变更信息包括指 示 eNB3上的小区为主小区的指示信息等，当 eNB3收到主小区变更信息后， 根据其中的指示信息， 对 UE 的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中式服务； 所述 UE和 eNB2根据收到的主小区变更 信息中的指示信息，获知变更后的主小区为 eNB3上的小区，返回确认消息； eNBl释放并离开 UE关联的小区列表。
实施例五：
本实施例中， 主小区选择方式为竟争方式、 判决规则为业务交互时间， 如图 7所示， eNBl、 eNB2和 eNB3上分别有一个小区， 本发明实现 CoMP 系统中选择主小区的方法， 如图 9所示， 该方法包括以下几个步骤：
步骤 901 : UE在 eNBl、 eNB2和 eNB3上均有业务连接， 且 eNBl上 的小区为 UE的当前主小区；
步骤 902: 当 eNBl上的业务需要释放时， eNBl在释放与 UE的连接 前， 分别统计 eNB2和 eNB3与 UE进行业务交互的时间， 选择业务交互时 间较长的小区为新的主小区；
本步骤中， 所述 eNBl分别统计 eNB2和 eNB3与 UE进行业务交互的 时间， 一般是， UE 向 eNBl上报与 eNB2和 eNB3的接入顺序， 在先接入 的 eNB与 UE进行业务交互的时间长于在后接入的 eNB与 UE进行业务交 互的时间；如， UE在先接入的 eNB为 eNB2,则 eNBl向 UE及 eNB2、 eNB3 发送主小区变更信息，所述主小区变更信息包括指示 eNB2上的小区为主小 区的指示信息等； 当 eNB2收到主小区变更信息后， 根据其中的指示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE提供基本服务和集中 式服务； 所述 UE和 eNB3根据收到的主小区变更信息中的指示信息， 获知 变更后的主小区为 eNB2上的小区， 返回确认消息； eNBl释放并离开 UE 关联的小区列表。
实施例六：
主小区选择方式为指定新接入的小区为主小区的指派方式， 如图 7所 示， eNBl、 eNB2和 eNB3上分别有一个小区， 其中， UE新接入 eNB3上 的小区时， 本发明实现 CoMP系统中选择主小区的方法， 如图 10所示， 该 方法包括以下几个步骤：
步骤 S101 : UE在 eNBl和 eNB2上均有业务连接， 且 eNBl为 UE的 当前主小区；
步骤 S102: 当 UE需要在 eNB3上的小区发起业务时， 将所述 eNB3 上的小区的测量结果上报给 eNBl ;
步骤 SI 03: eNBl在收到 UE对新接入小区的测量上报后， 指定新接入 的 eNB3上的小区为新的主小区；
具体的， eNB 1在收到 UE对新接入的 eNB3上的小区的测量上报后， 在测量结果满足接入条件时， 通知 UE接入 eNB3上的小区； eNBl向 UE 及 eNB2、 eNB3发送主小区变更信息， 所述主小区变更信息包括指示 eNB3 上的小区为主小区的指示信息等； 当所述 eNB3收到主小区变更信息后，根 据其中的指示信息， 对 UE的无线链路建立、 重配等过程进行控制， 为 UE 提供基本服务和集中式服务； 所述 UE及 eNB2收到主小区变更信息后， 根 据其中的指示信息， 获知变更后的主小区为 eNB3 , 返回确认消息； eNBl 变更为辅小区， 为 UE提供增强业务和分布式服务。
通过本发明的方法， 解决了 CoMP系统中在多个小区中决策主小区的 重要问题， 通过竟争方式可以更加合理的选择主小区， 并能充分使用了系 统的资源， 提高了用户感受的满意度， 同时也保证了运营商的利益。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围， 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等， 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种协作多点传输（CoMP ) 系统中选择主小区的方法， 其特征在 于， 该方法包括：
当用户设备（UE ) 向初始接入的小区所在演进基站 （eNB )通知需要 在其他小区发起业务时， 所述 eNB将所述初始接入的小区确定为主小区； 当前主小区所在 eNB在所有与 UE有业务连接的小区中按照主小区选 择方式确定新的主小区。
2、 根据权利要求 1所述的方法， 其特征在于， 所述主小区选择方式包 括： 竟争方式和指派方式；
所述竟争方式为： 由当前主小区所在 eNB实时统计所有和 UE有业务 连接的小区对判决规则的满足程度， 选择最满足判决规则的小区为新的主 小区；
所述指派方式为： 当前主小区所在 eNB指派新接入的小区为主小区、 或者当前主小区所在 eNB在所有和 UE有业务连接的小区中随机指派一个 小区为新的主小区。
3、 根据权利要求 2所述的方法， 其特征在于， 所述主小区选择方式为 竟争方式、 判决规则为信号质量时， 所述按照主小区选择方式确定新的主 小区为： 当前主小区所在 eNB通过 UE的测量上 ^艮获取与 UE有业务连接 的小区的信号质量， 选择其中信号质量最佳的小区作为新的主小区。
4、 根据权利要求 2所述的方法， 其特征在于， 所述主小区选择方式为 竟争方式、 判决规则为小区负载情况时， 所述按照主小区选择方式确定新 的主小区为： 当前主小区所在 eNB通过 S1或 X2接口获取与 UE有业务连 接的小区的 eNB的负载情况， 选择包括自身在内的负荷值最低的小区为新 的主小区。
5、 根据权利要求 2所述的方法， 其特征在于， 所述主小区选择方式为 竟争方式、 判决规则为信号质量与小区负载情况时， 所述按照主小区选择 方式确定新的主小区为： 当前主小区所在 eNB通过 UE的测量上报获取与 UE有业务连接的小区的信号质量 S ( i ), 并通过 SI或 X2接口获取与 UE 有业务连接的小区的 eNB的负载情况 L ( i );
根据 S ( i )和 L ( i )对各小区进行选择因子计算， 所述选择因子 C ( i ) 为 S ( i )与 L ( i )之差； 所述当前主小区所在 eNB选择 C ( i )值最大的小 区为新的主小区。
6、 根据权利要求 2所述的方法， 其特征在于， 所述主小区选择方式为 竟争方式、 判决规则为业务交互时间时， 所述按照主小区选择方式确定新 的主小区为： 当前主小区所在 eNB在释放与 UE的连接前， 分别统计与 UE 有业务连接的小区所在 eNB与 UE进行业务交互的时间， 选择业务交互时 间最长的小区为新的主小区。
7、 根据权利要求 2所述的方法， 其特征在于， 所述主小区选择方式为 指定新接入的小区为主小区的指派方式， 所述按照主小区选择方式确定新 的主小区为： 在 UE新接入一个小区时， 当前主小区所在 eNB指定新接入 的小区为新的主小区。
8、 一种 CoMP系统， 其特征在于， 该系统包括： UE、 eNB； 其中， UE, 用于向初始接入的小区所在 eNB通知需要在其他小区发起业务； eNB ,用于为 UE初始接入的小区所在 eNB时，收到 UE通知需要在其 他小区发起业务时， 将所述初始接入的小区确定为主小区； 为当前主小区 所在 eNB时， 在所有与 UE有业务连接的小区中按照主小区选择方式确定 新的主小区。
9、 根据权利要求 8所述的系统， 其特征在于， 所述主小区选择方式为 竟争方式、 判决规则为信号质量， 则所述 eNB为当前主小区所在 eNB时， 所述 eNB通过 UE的测量上报获取与 UE有业务连接的小区的信号质量， 选择其中信号质量最佳的小区作为新的主小区；
相应的， 所述 UE, 还用于测量有业务连接的小区的信号质量， 并向当 前主小区所在 eNB上报。
10、 根据权利要求 8所述的系统， 其特征在于， 所述主小区选择方式 为竟争方式、判决规则为小区负载情况，则所述 eNB为当前主小区所在 eNB 时，所述 eNB通过 S1或 X2接口获取与 UE有业务连接的小区的 eNB的负 载情况， 选择其中负荷值最低的小区为新的主小区。
11、 根据权利要求 8 所述的系统， 其特征在于， 所述主小区选择方式 为竟争方式、 判决规则为信号质量与小区负载情况， 则所述 eNB为当前主 小区所在 eNB时， 所述 eNB通过 UE的测量上 获取与 UE有业务连接的 小区的信号质量 S ( i ), 并通过 SI或 X2接口获取与 UE有业务连接的小区 的 eNB的负载情况 L ( i ); 根据 S ( i )和 L ( i )对各小区进行选择因子计 算， 所述选择因子 C ( i )为 S ( i )与 L ( i )之差， 所述当前主小区所在 eNB 选择 C ( i )值最大的小区为新的主小区。
12、 根据权利要求 8所述的系统， 其特征在于， 所述主小区选择方式 为竟争方式、判决规则为业务交互时间，则所述 eNB为当前主小区所在 eNB 时， 所述 eNB在释放与 UE的连接前， 分别统计与 UE有业务连接的小区 所在 eNB与 UE进行业务交互的时间， 选择业务交互时间最长的小区为新 的主小区。
13、 根据权利要求 8所述的系统， 其特征在于， 所述主小区选择方式 为指定新接入的小区为主小区的指派方式，则在 UE新接入一个小区时，所 述 eNB为当前主小区所在 eNB时， 所述 eNB指定新接入的小区为新的主 小区。
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