WO2016165585A1 - 一种负载均衡方法及设备 - Google Patents

一种负载均衡方法及设备 Download PDF

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Publication number
WO2016165585A1
WO2016165585A1 PCT/CN2016/078827 CN2016078827W WO2016165585A1 WO 2016165585 A1 WO2016165585 A1 WO 2016165585A1 CN 2016078827 W CN2016078827 W CN 2016078827W WO 2016165585 A1 WO2016165585 A1 WO 2016165585A1
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base station
target
load
light
overloaded
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English (en)
French (fr)
Inventor
齐丙花
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/086—Load balancing or load distribution among access entities
    • H04W28/0861—Load balancing or load distribution among access entities between base stations
    • H04W28/0865—Load balancing or load distribution among access entities between base stations of different Radio Access Technologies [RATs], e.g. LTE® or Wi-Fi®

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a load balancing method and device.
  • CRRM Common Radio Resource Management
  • the centralized control node centrally manages multiple radio access technologies (Radio Access Technology, RAT for short).
  • the CRRM acquires the load information of each base station of each RAT, and detects the overload base station and the light load base station according to the load information, and selects the target base station among the light load base stations.
  • the CRRM sends a target equalization user handover indication message to the overloaded base station, and requests the target base station to perform resource reservation.
  • the light-weight base station with the same overload base station system as the target base station is preferentially selected, and the light-weight base station closest to the overloaded base station is selected as the target base station.
  • the light-weight base station closest to the overloaded base station is selected as the target base station among the plurality of light-load base stations; if there is no lighter method than the overloaded base station system Carrying the base station, selecting the light-weight base station closest to the overloaded base station; if there is only one light-weight base station closest to the overloaded base station, determining that the base station is the target base station; otherwise, in the light-weight base station closest to the overloaded base station The lightest load base station with the lightest load is selected as the target base station.
  • the overload base station and the target base station are load balanced by handover and spectrum sharing.
  • the inventors have found that it is preferred to select a target base station according to the adopted system, and secondly, select a target base station according to the distance from the overloaded base station and the load of the light-load base station, and the selected target base station may have less overlapping overlay multiplexing with the overloaded base station, and can be equalized. There are very few users and it is difficult to achieve optimal load balancing.
  • the embodiment of the present application provides a load balancing method and device, which are used to improve load balancing effects between multi-standard networks.
  • a load balancing method including:
  • the light-weight base station having the largest coverage area of the overloaded base station as the target base station corresponding to the overloaded base station
  • the coverage relationship is any one of the following:
  • the overloaded base station is included in the corresponding light-load base station
  • the overloaded base station includes a corresponding one of the light load base stations
  • overload base station co-station and cross coverage with the corresponding light load base station
  • the overloaded base station and the corresponding light-weight base station are not co-located and edge-crossed.
  • determining, according to the coverage relationship between the overloaded base station and each of the corresponding light-loading base stations, the light-weight base station that has the largest overlapping coverage area with the overloaded base station is the target base station corresponding to the overloaded base station include:
  • the method further includes:
  • one of the light-load base stations including the relationship is selected as the target base station corresponding to the overloaded base station.
  • the method further includes:
  • one of the light-load base stations of the common-station cross-coverage relationship is selected as the overload base station Corresponding target base station.
  • the method further includes:
  • selecting one of the light-loaded base stations as the target base station corresponding to the overloaded base station includes:
  • one of the light-loading base stations that is the same as the RAT system of the overloaded base station is selected as the target base station corresponding to the overloaded base station.
  • the selecting one of the light-weight base stations that are the same as the RAT of the overloaded base station as the target base station includes:
  • the method further includes:
  • the light-weight base station that has the largest number of multi-mode multi-connection UEs that use the overload base station as a serving base station and supports the RAT system of the light-load base station.
  • the partial load balancing of the overloaded base station to the target base station corresponding to the overloaded base station includes:
  • the sum of the loads of the at least one target UE is not less than the target load. the amount;
  • determining the at least one target UE according to the target load quantity, the type of the UE served by the overloaded base station, and the service type of the UE served by the overloaded base station including:
  • the target UE is selected from the determined multi-mode multi-connection UE according to the target load, including:
  • the method further includes:
  • the equalizing the load of the at least one target UE from the overloaded base station to the target base station corresponding to the overloaded base station includes:
  • a load balancing device including:
  • An acquiring module configured to acquire load information of each base station in each radio access technology RAT
  • a first determining module configured to determine, according to load information of each of the base stations, an overload base station and a light load base station corresponding to each overload base station;
  • a second determining module configured to determine, according to the coverage relationship between the overloaded base station and each of the corresponding light-load base stations, the light-weight base station that has the largest overlap coverage area with the overload base station as the overload base station Corresponding target base station;
  • a load balancing module configured to balance a partial load of the overloaded base station to the target base station corresponding to the overloaded base station.
  • the coverage relationship is any one of the following:
  • the overloaded base station is included in the corresponding light-load base station
  • the overloaded base station includes a corresponding one of the light load base stations
  • overload base station co-station and cross coverage with the corresponding light load base station
  • the overloaded base station and the corresponding light-weight base station are not co-located and edge-crossed.
  • the second determining module is specifically configured to:
  • the second determining module is further configured to:
  • the light-loaded base station whose coverage relationship is the included relationship does not exist, and at least one of the light-load base stations whose coverage relationship is the inclusion relationship, the light load from the inclusion relationship One of the base stations is selected as the target base station corresponding to the overloaded base station.
  • the second determining module is further configured to:
  • the light-load base station of the co-station cross-coverage relationship selects one of the light-load base stations of the common-station cross-coverage relationship as the target base station corresponding to the overload base station.
  • the second determining module is further configured to:
  • the light-loading base station whose coverage relationship is the common-station cross-coverage relationship does not exist, obtain the light-load base station corresponding to each of the overloaded base stations, and use the overloaded base station as the serving base station and support the light
  • the number of the multi-mode multi-connection user equipment UEs of the RAT system of the base station determining the maximum value of the number of the multi-mode multi-connection UEs obtained, and using the light-weight base station corresponding to the maximum value as the The target base station corresponding to the overloaded base station.
  • the second determining module is specifically configured to:
  • one of the light-loading base stations that is the same as the RAT system of the overloaded base station is selected as the target base station corresponding to the overloaded base station.
  • the second determining module is specifically configured to:
  • the second determining module is further configured to:
  • the most multi-mode multi-connection UE that uses the overload base station as the serving base station and supports the RAT system of the light-load base station.
  • the light load base station is used as the target base station corresponding to the overload base station.
  • the load balancing module is specifically configured to:
  • the load balancing module is specifically configured to:
  • Determining the multi-mode multi-connection UE served by the overloaded base station selecting a target UE from the determined multi-mode multi-connection UE according to the target load quantity, wherein a sum of loads of the selected target UE is not less than the target load quantity.
  • the load balancing module is specifically configured to:
  • the load balancing module is further configured to:
  • the UE that does not establish a wireless connection with the target base station in the multi-mode multi-connection UE obtains the second set according to the determined UE;
  • the load balancing module is specifically configured to:
  • another load balancing device mainly comprising a processor and a memory, wherein the memory stores a preset program, the processor reads the program in the memory, and executes the following process according to the program:
  • the light-weight base station having the largest coverage area of the overloaded base station as the target base station corresponding to the overloaded base station
  • the coverage relationship is any one of the following:
  • the overloaded base station is included in the corresponding light-load base station
  • the overloaded base station includes a corresponding one of the light load base stations
  • overload base station co-station and cross coverage with the corresponding light load base station
  • the overloaded base station and the corresponding light-weight base station are not co-located and edge-crossed.
  • the processor according to the coverage relationship between the overloaded base station and each of the corresponding light-load base stations, if it is determined that at least one of the coverage relationships is the light-loaded base station of the included relationship, One of the light-load base stations included in the relationship is selected as the target base station corresponding to the overload base station.
  • the processor determines that the light-loading base station whose coverage relationship is the included relationship is not present, if there is at least one of the light-load base stations whose coverage relationship is the inclusion relationship, the inclusion relationship One of the light-load base stations is selected as the target base station corresponding to the overload base station.
  • the processor determines that the light load base station whose coverage relationship is the included relationship does not exist, and the light load base station whose coverage relationship is the inclusion relationship does not exist, if it is determined that at least one The light-loading base station whose coverage relationship is the common-station cross-coverage relationship selects one of the light-load base stations of the common-station cross-coverage relationship as the target base station corresponding to the overloaded base station.
  • the processor determines that the light-loading base station with the coverage relationship is the shared-station cross-coverage relationship, the processor obtains the light-load base station corresponding to each of the overloaded base stations, and uses the overloaded base station as the serving base station. And the number of the multi-mode multi-connection user equipment UEs of the RAT system of the light-weight base station; the maximum value of the number of the multi-mode multi-connection UEs that are obtained, and the light corresponding to the maximum value The base station is used as a target base station corresponding to the overload base station.
  • the processor determines that there is at least one light-loading base station that is the same as the RAT system of the overloaded base station, one of the light-loading base stations that is the same as the RAT system of the overloaded base station is selected as the overloaded base station.
  • Target base station If the processor determines that there is at least one light-loading base station that is the same as the RAT system of the overloaded base station, one of the light-loading base stations that is the same as the RAT system of the overloaded base station is selected as the overloaded base station.
  • the processor acquires a minimum value of the load information of the light load base station that is the same as the RAT system of the overloaded base station, and determines the light load base station corresponding to the minimum value as a target corresponding to the overload base station. Base station.
  • the processor determines that there is no the light-load base station that is the same as the RAT system of the overload base station, the multi-mode multi-connection UE that selects the RAT system that uses the overload base station as the serving base station and supports the light-load base station is selected.
  • the light-weight base station having the largest number is the target base station corresponding to the overload base station.
  • the processor equalizes a part of the load of the overloaded base station to a target base station corresponding to the overloaded base station, as follows:
  • the processor determines the multi-mode multi-connected UE served by the overloaded base station
  • the processor determines, according to the target load quantity, a UE that has established a wireless connection with the target base station in the multi-mode multi-connection UE, and obtains a first set according to the determined UE;
  • the processor determines that the selected load of the target UE is smaller than the target load, determining that the UE that does not establish a wireless connection with the target base station in the multi-mode multi-connection UE is obtained according to the determined UE. a second set; selecting the target UE from the second set according to the target load amount and selecting a load amount of the target UE from the first set, wherein, from the first set and the The sum of the load amounts of the target UEs selected by the second set is not less than the target load amount.
  • the processor offloads data of the RAT system supported by the target base station in the load of the target UE to the corresponding target base station.
  • the light-weight base station with the largest overlapping coverage area of the overloaded base station is determined as the target base station corresponding to the overloaded base station, and
  • the partial load balancing of the overloaded base station to the target base station corresponding to the overloaded base station enables a large number of user equipment UEs capable of load balancing, and improves the load balancing effect between the multi-standard networks.
  • FIG. 1 is a schematic flowchart of a detailed method for load balancing in an embodiment of the present application
  • FIG. 2a is a schematic diagram of an included relationship in an embodiment of the present application.
  • FIG. 2b is a schematic diagram of an inclusion relationship in an embodiment of the present application.
  • 2c is a schematic diagram of a cross-over relationship of a common station in an embodiment of the present application.
  • 2d is a schematic diagram of a cross-over relationship of a non-co-site in the embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a load balancing device according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another load balancing device according to an embodiment of the present application.
  • Step 101 Acquire load information of each base station in each RAT.
  • Step 102 Determine, according to load information of each base station, an overload base station and a light load base station corresponding to each overload base station.
  • determining whether the base station is an overload base station or a light load base station according to load information of the base station is not the focus of the present application. All implementations that determine whether the base station is overloaded based on the load information can be applied to the present application.
  • the load information of the base station is compared with a first preset threshold. If the first preset threshold is exceeded, the base station is determined to be an overload base station; and/or the base station is loaded. The information is compared with a second preset threshold. If the second preset threshold is not exceeded, the base station is determined to be a light-load base station. This is for illustrative purposes only and is not intended to be limiting in practice.
  • Step 103 Determine, according to the coverage relationship of the overloaded base station and each of the corresponding light-load base stations, the light-weight base station with the largest overlapping coverage area of the overloaded base station as the target base station corresponding to the overloaded base station.
  • the coverage relationship is any of the following:
  • the overloaded base station S is included in the corresponding light-load base station CN;
  • the overloaded base station S includes a corresponding light-load base station CN;
  • the overloaded base station S and the corresponding light-weight base station CN are not co-located and the edges cross-cover.
  • the target base station when the target base station is determined according to the coverage relationship between the overloaded base station and each of the corresponding light-weight base stations, the light-weight base station whose coverage relationship is the included relationship is preferentially selected, and the coverage relationship is selected as the light-load base station including the relationship. Secondly, the light-weight base station with the coverage relationship of the co-site cross-coverage relationship is selected, and finally the light-weight base station with the coverage relationship of the non-communication cross-overlay relationship is selected.
  • the process of selecting the target base station corresponding to the overloaded base station is as follows:
  • a light-weight base station is selected from the light-load base stations that are included in the relationship as the target base station corresponding to the overload base station;
  • a light-weight base station is selected from the light-load base stations including the relationship as the target corresponding to the overload base station.
  • the user equipment served according to the overloaded base station The (User Equipment, UE) type and the RAT system supported by the light-weight base station select one of the light-load base stations corresponding to the overload base station as the target base station corresponding to the overload base station.
  • the (User Equipment, UE) type and the RAT system supported by the light-weight base station select one of the light-load base stations corresponding to the overload base station as the target base station corresponding to the overload base station.
  • Target base station if there is no light-load base station whose coverage relationship is an included relationship, and there is no light-load base station whose coverage relationship is an inclusion relationship, and there is no light-load base station whose coverage relationship is a common-station cross-coverage relationship, the following process is selected.
  • Target base station
  • the maximum value of the number of acquired multi-mode multi-connection UEs is determined, and the light-weight base station corresponding to the maximum value is used as the target base station corresponding to the overload base station.
  • one of the light-weight base stations is randomly selected as the target base station, or the light-load station with the smallest load among the light-weight base stations corresponding to the maximum value is selected as the target base station.
  • the light-load base station is used as the target base station of the overload base station.
  • the light-weight base station is used as a target base station of the overload base station.
  • the light-load base station serves as a target base station of the overload base station.
  • one of the multiple light-load base stations that meet the specific coverage relationship can be selected as the target base station according to the following procedure:
  • one of the light-weight base stations that are the same as the RAT system of the overloaded base station is selected as the target base station corresponding to the overloaded base station;
  • the light-weight base station with the largest number of multi-mode multi-connection UEs that use the overload base station as the serving base station and supports the RAT system of the light-weight base station is selected as the target corresponding to the overload base station. Base station.
  • a method of randomly selecting one of a plurality of light-load base stations that meet a specific coverage relationship as a target base station is not excluded.
  • the light-load base station is used as the The target base station of the overloaded base station.
  • the target base station is selected according to the load information of the light-load base station that is the same as the RAT system of the overload base station, as follows:
  • the minimum value in the load information of the light-load base station is the same as that of the overloaded base station, and the light-weight base station corresponding to the minimum value is determined as the target base station corresponding to the overloaded base station.
  • Step 104 The partial load of the overloaded base station is equalized to the target base station corresponding to the overloaded base station.
  • the target load quantity to be equalized is determined according to the load information of the overloaded base station; and the at least one target UE is determined according to the target load quantity, the type of the UE served by the overloaded base station, and the service type of the UE served by the overloaded base station, where the at least one target UE The sum of the loads is not less than the target load; the load of the at least one target UE is equalized from the overloaded base station to the target base station corresponding to the overloaded base station.
  • the at least one target UE is determined according to the target load, the type of the UE served by the overloaded base station, and the service type of the UE served by the overloaded base station, as follows:
  • Determining the multi-mode multi-connection UE served by the overloaded base station selecting the target UE from the determined multi-mode multi-connection UE according to the target load quantity, wherein the sum of the loads of the selected target UE is not less than the target load quantity.
  • the multi-mode multi-connection UE is preferentially selected as the target UE, and the service type supported by the multi-mode multi-connection UE includes both the service type supported by the target base station system and the service type not supported by the target base station system.
  • the service type supported by the target base station system all or part of the service data is directly offloaded to the target base station for transmission, and the load of the service type that is not supported by the target base station system is still transmitted in the overloaded base station.
  • the non-multi-mode multi-connection UE is selected as the target UE, the inter-RAT handover is required to implement the load transfer, which has a great impact on the user experience and network performance, and needs to adopt the handover mode to implement load balancing.
  • All services of the UE need to be overloaded.
  • the base station switches to the target base station, which requires that all services of the UE are the service types supported by the network standard of the target base station.
  • the method of preferentially selecting the multi-mode multi-connection UE as the target UE avoids the handover failure and the user experience reduction caused by the inter-RAT handover, and achieves load balancing between the base stations across the RAT with minimum cost.
  • the target UE is selected from the determined multi-mode multi-connection UE according to the target load, as follows:
  • determining that the UEs that do not establish a wireless connection with the target base station in the multi-mode multi-connection UE obtain the second set according to the determined UE, according to Determining a target UE from the second set by selecting a target load amount and selecting a load amount of the target UE from the first set, wherein a sum of load amounts of the target UEs selected from the first set and the second set is not less than a target load the amount.
  • the UE that has not accessed the standard network supported by the target base station needs to access the system supported by the target base station, all or part of the load of the target UE can be directly offloaded to the target base by the overloaded base station. Transfer in the station.
  • the multi-mode multi-connection UE that has established a wireless connection with the target base station is preferentially selected as the target UE.
  • the data of the RAT system supported by the target base station in the load of the target UE is offloaded to the corresponding target base station.
  • the light-weight base station with the largest overlapping coverage area of the overloaded base station is determined as the target base station corresponding to the overloaded base station, and the partial load of the overloaded base station is used. Equilibrium to the target base station, compared to the method of selecting the same base station or the nearest base station or the lightest load base station as the target base station, the number of UEs that can be equalized is large, and the equalization effect is better without affecting the network performance. .
  • the handover mode is not adopted, but the UE having the multi-mode multi-connection capability is preferentially configured to establish a connection with the cross-standard target base station while maintaining the wireless connection with the overloaded base station, without affecting the network. At the same time, the balance will be better.
  • the light-weight base station with the included relationship is preferentially selected as the target base station, that is, the overloaded base station is included in the coverage of the light-load base station, so that the overloaded base station can support the target base station.
  • the load of the UE can be equalized to the target base station, and the probability of successful balance is high, and the impact on the network performance index is also small.
  • the light-weight base station with the included relationship is preferentially selected as the target base station, that is, the coverage of the overloaded base station includes the coverage of the light-weight base station, so that the overloaded base station supports the target base station.
  • the load of the central UE can be equalized to the target base station, the probability of successful balance is high, and the impact on the network performance index is also small.
  • the light-weight base station that preferentially selects the cross-over coverage relationship of the common station is used as the target base station, so that the overloaded base station supports the target base station.
  • the load of the edge UE can be equalized to the target base station, the probability of successful balance is high, and the impact on the network performance index is also small.
  • the overloaded base station is included in the corresponding light-loaded base station, and is overloaded.
  • the base station is different from the system of the light-load base station that is included in the relationship.
  • Step 1 The CRRM acquires load information of each base station in each RAT, and determines an overload base station according to load information of each base station, and assumes that the overloaded base station is represented as S, and the overloaded base station is expressed as RAT1;
  • Step 2 In the neighboring area of the overloaded base station S, select a base station whose load is less than a set threshold as a candidate light-load base station. It is assumed that the number of candidate light-weight base stations is N, and the candidate light-weight base stations are respectively denoted as C1, C2, ..., CN, and the coverage relationship and system relationship of the candidate light-load base station and the overload base station are as shown in Table 1:
  • Overload base station Candidate light load base station Coverage relationship System relationship S C1 Inclusion relationship the same S C2 Inclusion relationship different S C3,...,CN-1 Non-communication cross-over coverage different S CN Total station cross coverage relationship different
  • Step 3 In the N candidate light-weight base stations, the candidate light-weight base station that satisfies the included relationship with the overloaded base station is preferentially selected as the target base station, that is, C2 is selected as the target base station, and the system supported by C2 is assumed to be RNT2.
  • Step 4 Determine a selection set of priorities of the target UE according to the type of the UE served by the overloaded base station and the format of the target base station.
  • determining a set of UEs that use the overloaded base station as the serving base station and supporting the RNT2 system is recorded as the set A;
  • the UE that has the multi-mode multi-connection UE in the set A and the wireless connection with the target base station is preferentially selected as the target UE, that is, the first priority selection set A1 is the multi-mode multi-connection UE in the set A that has established a wireless connection with the target base station.
  • the UE that selects the multi-mode multi-connection UE in the set A and does not establish a radio connection with the target base station is used as the target UE, that is, the second priority selection set A2 is the multi-mode multi-connection UE in the set A that does not establish a radio connection with the target base station.
  • the non-multi-mode multi-connection UE in the set A is selected, and all the services are the UEs of the service type supported by the RAT2 system supported by the target base station, that is, the third priority selection set A3 is the non-multi-mode in the set A.
  • Multi-connection to the UE, and all services are the types of services that the RAT2 standard supported by the target base station can support ⁇ .
  • step 5 according to the target load amount that the overload base station needs to be balanced, it is recorded as LOAD_T, and the target UE is selected according to the priority order of the selection set of each priority.
  • the UEs in the first priority selection set A1 are preferentially selected, and the UEs in the set A1 are arranged in descending order according to the magnitude of the load amount, and the UEs in the set A1 are sequentially selected according to the arrangement order, and the LOAD_T is updated to be the LOAD_T minus the selected UE.
  • Each UE is arranged in descending order according to the magnitude of the load;
  • step 6 all or part of the target UE is load balanced to the target base station.
  • load balancing may be performed by using one or more of the following equalization strategies:
  • the service data of the multi-mode multi-connection UE that has established a wireless connection with the target base station is offloaded to the target base station for transmission;
  • the multi-mode multi-connection UE that does not establish a wireless connection with the target base station, after establishing a wireless connection by the target base station, offloads the service data to the target base station for transmission;
  • the third type after the target base station reserves the handover resource successfully for the target UE, indicates that the overloaded base station sends a handover command to the target UE of the service type supported by the RAT2 system supported by the target base station to the non-multi-mode multi-connection UE, and all the services are passed.
  • the different system switching process is switched to the target base station.
  • step 1 and step 2 For the specific process of step 1 and step 2, refer to step 1 and step 2 in the first embodiment.
  • the coverage relationship and system relationship of the candidate light-load base station and the overload base station obtained in step 2 are as shown in Table 2:
  • Overload base station Candidate light load base station Coverage relationship System relationship S Inclusion relationship S C1 Inclusion relationship different S C2 Inclusion relationship different S C3,...,CN-1
  • S Inclusion relationship S C1 Inclusion relationship different S C2 Inclusion relationship different S C3,...,CN-1 Non-communication cross-over coverage different S CN Total station cross coverage relationship different
  • the light-loading base station that has the coverage relationship with the overloaded base station is selected as the light-loaded base station that is included in the relationship, and after determining that there is no light-loaded base station in the included relationship, the coverage relationship with the overloaded base station is selected as the light-loaded base station with the relationship, and it is determined that there are two One of the light-load base stations C1 and C2 including the relationship selects one of the two light-load base stations including the relationship as the target base station.
  • the base stations of the two light-load base stations having the same relationship as the overload base station are preferentially selected, and it is determined that there is no base station with the same system as the overload base station, and each of the light-load base stations having the inclusion relationship is separately counted as the overload base station.
  • the number of multi-mode multi-connection UEs that support the base station and support the system of the light-loaded base station including the relationship it is assumed that the number of statistics corresponding to C1 is MC1, and the data obtained by C2 is MC2, and MC1 and MC2 are compared.
  • MC1>MC2, select C1 as the target base station; if MC1 ⁇ MC2, select C2 as the target base station; if MC1 MC2, select the lightest base station in C1 and C2 as the target base station, assuming that the target base station supports the standard RAT2, overload
  • the system supported by the base station is RAT1.
  • Step 4 Determine a selection set of priorities of the target UE according to the type of the UE served by the overloaded base station and the format of the target base station.
  • determining a set of UEs that use the overloaded base station as the serving base station and supporting the RNT2 system is recorded as the set A;
  • the UE that has the multi-mode multi-connection UE in the set A and the wireless connection with the target base station is preferentially selected as the target UE, that is, the first priority selection set A1 is the multi-mode multi-connection UE in the set A that has established a wireless connection with the target base station.
  • the UE that selects the multi-mode multi-connection UE in the set A and does not establish a radio connection with the target base station is used as the target UE, that is, the second priority selection set A2 is the multi-mode multi-connection UE in the set A that does not establish a radio connection with the target base station.
  • the UE in the central coverage area of the overloaded base station is preferentially selected. For example, when the received power of the UE is greater than the set threshold, the UE is located in the central coverage area of the base station, because the UE in the central coverage area of the overloaded base station is at the target base station.
  • the first priority subset A21 in the set A2 is ⁇ the set A does not establish a wireless connection with the target base station, and is in the center coverage area of the overloaded base station.
  • Multimode multi-connection UE ⁇ the second priority sub-set A22 in the set A2 is ⁇ a multi-mode multi-connected UE in the set A that does not establish a radio connection with the target base station and is in the non-central coverage area of the overloaded base station ⁇ ;
  • the non-multi-mode multi-connection UE in the set A is selected, and all the services are the UEs of the service type supported by the RAT2 system supported by the target base station, that is, the third priority selection set A3 is the non-multi-mode in the set A.
  • Multiple UEs are connected, and all services are supported by the RAT2 system supported by the target base station.
  • the UEs in the central coverage area of the overloaded base station are preferentially selected. For example, when the received power of the UE is greater than the set threshold, the base station is determined to be located.
  • the central coverage area because the UE in the central coverage area of the overloaded base station has a high probability of being in the coverage of the target base station, and the probability that the signal power or signal quality of the target base station satisfies the set handover condition is high, that is, in the set A3.
  • the first priority sub-set A31 is ⁇ non-multi-mode multi-connection UE in the set A, and all services are the service types supported by the RAT2 system supported by the target base station, and are in the central coverage area of the overloaded base station ⁇ , in the set A3
  • the second priority sub-set A32 is a non-multi-mode multi-connection UE in the set A, and all services are service types supported by the RAT2 system supported by the target base station, and In the non-central coverage area of the overloaded base station ⁇ .
  • Steps 5 to 6 can be referred to the implementation process of step 5 and step 6 in the first embodiment. Said.
  • the overloaded base station is a light-load base station with a co-station cross-coverage relationship, and the system of two light-load base stations that have a cross-overlapping relationship of the common station is different from the system of the overload base station.
  • step 1 and step 2 For the specific process of step 1 and step 2, refer to step 1 and step 2 in the first embodiment.
  • the coverage relationship and system relationship of the candidate light-load base station and the overload base station obtained in step 2 are as shown in Table 3:
  • Overload base station Candidate light load base station Coverage relationship System relationship S Inclusion relationship S Inclusion relationship S C1 Total station cross coverage relationship different S C2..., CN-1 Total station cross coverage relationship different S CN Total station cross coverage relationship different
  • the light-loading base station with the included relationship is preferentially selected as the light-weight base station with the included relationship, and the light-weight base station with the included relationship is determined.
  • the sub-optimal selection and the overloaded base station coverage relationship are the light-load base stations of the co-station cross-coverage relationship, and it is determined that there are two light-load base stations C1 and CN that are the cross-overlapping relationship of the common station, from the light One of the base stations C1 and CN is selected as the target base station.
  • the base station of the light-weight base station with the same two-station cross-coverage relationship is the same as the base station of the overloaded base station, and it is determined that there is no base station with the same system as the overloaded base station, and each of the light-load base stations having the inclusion relationship is separately counted.
  • the number of multi-mode multi-connection UEs in which the overloaded base station serves as the serving base station and supports the light-loaded base station including the relationship it is assumed that the number of statistics corresponding to C1 is MC1, and the data corresponding to the CN corresponding to the data is MCN, and the MC1 and the comparison are compared.
  • Step 4 Determine a selection set of priorities of the target UE according to the type of the UE served by the overloaded base station and the format of the target base station.
  • determining a set of UEs that use the overloaded base station as the serving base station and supporting the RNT2 system is recorded as the set A;
  • the UE that has the multi-mode multi-connection UE in the set A and the wireless connection with the target base station is preferentially selected as the target UE, that is, the first priority selection set A1 is the multi-mode multi-connection UE in the set A that has established a wireless connection with the target base station.
  • the UE that selects the multi-mode multi-connection UE in the set A and does not establish a radio connection with the target base station is used as the target UE, that is, the second priority selection set A2 is the multi-mode multi-connection UE in the set A that does not establish a radio connection with the target base station.
  • the non-multi-mode multi-connection UE in the set A is selected, and all the services are the UEs of the service type supported by the RAT2 system supported by the target base station, that is, the third priority selection set A3 is the non-multi-mode in the set A.
  • Multi-connection to the UE, and all services are the types of services that the RAT2 standard supported by the target base station can support ⁇ .
  • Steps 5 to 6 can be referred to the steps 5 and 6 in the first embodiment, and are not described in detail herein.
  • the overloaded base station is a light-load base station with a co-station cross-coverage relationship, and there are two light-load base stations that do not have a cross-overlapping relationship with the overloaded base station, and two light-weight base stations that do not have a common cross-overlay relationship and an overloaded base station The system is different.
  • step 1 and step 2 For the specific process of step 1 and step 2, refer to step 1 and step 2 in the first embodiment.
  • the coverage relationship and system relationship of the candidate light-load base station and the overload base station obtained in step 2 are as shown in Table 4:
  • Overload base station Candidate light load base station Coverage relationship System relationship S Inclusion relationship S Inclusion relationship S Total station cross coverage relationship S C1 Non-communication cross-over coverage different S C2 Non-communication cross-over coverage different
  • the light-loading base station with the included relationship is preferentially selected as the light-weight base station with the included relationship, and the light-weight base station with the included relationship is determined.
  • the sub-optimal selection and the overloaded base station coverage relationship are the light-weight base stations of the co-station cross-coverage relationship, determine the light-load base station without the cross-over coverage of the co-site, and finally select the coverage with the overloaded base station.
  • the light-load base station whose relationship is not the co-station cross-coverage relationship determines that there are two light-load base stations C1 and C2 which are non-co-located cross-coverage relations, and one of the light-load base stations C1 and C2 is selected as the target base station.
  • step 3 For a specific manner of selecting one of the light-load base stations C1 and C2 as the target base station, refer to the description of step 3 in the first embodiment.
  • Step 4 Determine a selection set of priorities of the target UE according to the type of the UE served by the overloaded base station and the format of the target base station.
  • determining a set of UEs that use the overloaded base station as the serving base station and supporting the RNT2 system is recorded as the set A;
  • the UE that has the multi-mode multi-connection UE in the set A and the wireless connection with the target base station is preferentially selected as the target UE, that is, the first priority selection set A1 is the multi-mode multi-connection UE in the set A that has established a wireless connection with the target base station.
  • the UE that selects the multi-mode multi-connection UE in the set A and does not establish a radio connection with the target base station is used as the target UE, that is, the second priority selection set A2 is the multi-mode multi-connection UE in the set A that does not establish a radio connection with the target base station.
  • the UE in the non-central coverage area of the overloaded base station in the set A2 is preferentially selected, because the probability that the UE of the non-central coverage area of the overloaded base station is located in the coverage of the target base station is large, and the probability of successfully accessing the target base station is higher.
  • the first priority subset A21 in the set A2 is ⁇ the multi-mode multi-connected UE in the set A that does not establish a wireless connection with the target base station and is in the non-central coverage area of the overloaded base station ⁇
  • the second priority in the set A2 is ⁇ a multi-mode multi-connected UE in the set A that does not establish a wireless connection with the target base station and is in the central coverage area of the overloaded base station ⁇ ;
  • the non-multi-mode multi-connection UE in the set A is selected, and all the services are the UEs of the service type supported by the RAT2 system supported by the target base station, that is, the third priority selection set A3 is the non-multi-mode in the set A.
  • Multiple UEs are connected, and all services are service types supported by the RAT2 system supported by the target base station ⁇ .
  • the UEs in the non-central coverage area of the overloaded base station in the set A3 are preferentially selected because the UEs of the non-central coverage area of the overloaded base station are located.
  • the probability of coverage of the target base station is large, and the probability that the signal power or signal quality of the target base station satisfies the handover setting condition is high, that is, the first priority subset A31 in the set A3 is ⁇ non-multi-mode in the set A.
  • the first priority subset A31 in the set A3 is ⁇ non-multi-mode in the set A.
  • Connected to the UE and all services are supported by the RAT2 system supported by the target base station, and are in the non-central coverage area of the overloaded base station ⁇ , and the second priority subset A32 in the set A3 is ⁇ non-multi-mode in the set A
  • the UE is connected, and all services are the types of services that the RAT2 system supported by the target base station can support, and are in the central coverage area of the overloaded base station ⁇ .
  • Steps 5 to 6 can be referred to the steps 5 and 6 in the first embodiment, and are not described in detail herein.
  • the coverage relationship between the overloaded base station and the corresponding light-weight base station is used as a priority factor to determine the target base station, and the number of UEs that can be equalized is more, and the equalization effect is better.
  • the base station with the largest number of multi-mode multi-connection UEs supporting the light-weight base station system as the serving base station is preferentially selected as the target base station, and the multi-mode is combined with priority.
  • the multi-connection capability UE establishes a connection with the cross-standard target base station based on the wireless connection with the overloaded base station, and then offloads its service data to implement load balancing, thereby avoiding handover failure and user experience caused by inter-RAT handover. Reduction, at a minimum cost Load balancing between RATs.
  • a load balancing device is also provided in the embodiment of the present application.
  • the equipment mainly includes:
  • the obtaining module 301 is configured to acquire load information of each base station in each radio access technology RAT;
  • the first determining module 302 is configured to determine, according to load information of each of the base stations, an overload base station and a light load base station corresponding to each overload base station;
  • the second determining module 303 is configured to determine, according to the coverage relationship of the overloaded base station and each of the corresponding light-load base stations, the light-load base station that has the largest overlap coverage area with the overload base station as the overload a target base station corresponding to the base station;
  • the load balancing module 304 is configured to balance part of the overloaded base station to the target base station corresponding to the overloaded base station.
  • the determining, by the first determining module, whether the base station is an overloaded base station or a light-loaded base station according to load information of the base station is not the focus of the present application. All implementations that determine whether the base station is overloaded based on the load information can be applied to the first determining module.
  • the first determining module compares the load information of the base station with a first preset threshold, and if the first preset threshold is exceeded, determining that the base station is an overloaded base station; and/or, the base station is The load information is compared with a second preset threshold. If the second preset threshold is not exceeded, the base station is determined to be a light-load base station. This is for illustrative purposes only and is not intended to be limiting in practice.
  • the coverage relationship is any one of the following:
  • the overloaded base station is included in the corresponding light-load base station
  • the overloaded base station includes a corresponding one of the light load base stations
  • overload base station co-station and cross coverage with the corresponding light load base station
  • the overloaded base station and the corresponding light-weight base station are not co-located and edge-crossed.
  • the second determining module determines the target base station, and preferentially selects the light-weight base station whose coverage relationship is the included relationship, and secondly selects the coverage relationship as The light-load base station including the relationship is selected, and then the light-load base station with the coverage relationship of the common station cross-coverage relationship is selected, and finally the light-weight base station with the coverage relationship of the non-communication cross-coverage relationship is selected.
  • the second determining module is specifically configured to:
  • the second determining module is further configured to:
  • the coverage relationship is the light-loaded base station of the included relationship, and there is at least one of the coverage And selecting, by the light-load base station that is the inclusion relationship, one of the light-load base stations including the relationship as the target base station corresponding to the overload base station.
  • the second determining module is further configured to:
  • the light-load base station of the co-station cross-coverage relationship selects one of the light-load base stations of the common-station cross-coverage relationship as the target base station corresponding to the overload base station.
  • the second determining module is further configured to:
  • the light-loading base station whose coverage relationship is the common-station cross-coverage relationship does not exist, obtain the light-load base station corresponding to each of the overloaded base stations, and use the overloaded base station as the serving base station and support the light
  • the number of the multi-mode multi-connection user equipment UEs of the RAT system of the base station determining the maximum value of the number of the multi-mode multi-connection UEs obtained, and using the light-weight base station corresponding to the maximum value as the The target base station corresponding to the overloaded base station.
  • the second determining module is specifically used to:
  • one of the light-loading base stations that is the same as the RAT system of the overloaded base station is selected as the target base station corresponding to the overloaded base station.
  • the second determining module is specifically configured to:
  • the second determining module is further configured to:
  • the most multi-mode multi-connection UE that uses the overload base station as the serving base station and supports the RAT system of the light-load base station.
  • the light load base station is used as the target base station corresponding to the overload base station.
  • the second determining module does not exclude a manner of randomly selecting one of the plurality of light-duty base stations that meet the specific coverage relationship as the target base station.
  • the load balancing module is specifically configured to:
  • the load balancing module is specifically configured to:
  • Determining the multi-mode multi-connection UE served by the overloaded base station selecting a target UE from the determined multi-mode multi-connection UE according to the target load quantity, wherein a sum of loads of the selected target UE is not less than the target load quantity.
  • the load balancing module is specifically configured to:
  • the load balancing module is further configured to:
  • the selected load of the target UE is smaller than the target load, determining that the UE that does not establish a wireless connection with the target base station in the multi-mode multi-connection UE obtains the second set according to the determined UE; Selecting the target UE from the second set by selecting the target load amount and selecting a load amount of the target UE from the first set, wherein selecting from the first set and the second set The sum of the load amounts of the target UEs is not less than the target load amount.
  • the load balancing module is specifically configured to: offload data of a RAT system supported by the target base station corresponding to a load of the target UE to a corresponding target base station.
  • the load balancing device provided by the embodiment is a CRRM entity, or the load balancing device integrates a functional module that implements a CRRM entity function.
  • the device mainly includes The processor 401 and the memory 402, wherein the memory 402 holds a preset program, the processor 401 reads the program in the memory 402, and executes the following process according to the program:
  • the light-weight base station having the largest coverage area of the overloaded base station as the target base station corresponding to the overloaded base station
  • the determining whether the base station is an overload base station or a light load base station according to load information of the base station is not the focus of the present application. All implementations that determine whether the base station is overloaded based on the load information can be applied to the present application.
  • the processor compares the load information of the base station with a first preset threshold, and if the first preset threshold is exceeded, determining that the base station is an overloaded base station; and/or, loading the base station The information is compared with a second preset threshold. If the second preset threshold is not exceeded, the base station is determined to be a light-load base station. This is for illustrative purposes only and is not intended to be limiting in practice.
  • the coverage relationship is any one of the following:
  • the overloaded base station is included in the corresponding light-load base station
  • the overloaded base station includes a corresponding one of the light load base stations
  • overload base station co-station and cross coverage with the corresponding light load base station
  • the overloaded base station and the corresponding light-weight base station are not co-located and edge-crossed.
  • the processor selects the light-weight base station whose coverage relationship is the included relationship preferentially according to the coverage relationship between the overloaded base station and the corresponding light-load base station, and then selects the coverage relationship as the light-load base station including the relationship. Secondly, the light-weight base station with the coverage relationship of the co-site cross-coverage relationship is selected, and finally the light-weight base station with the coverage relationship of the non-communication cross-coverage relationship is selected.
  • the processor 401 according to the coverage relationship between the overloaded base station and each of the corresponding light-load base stations, if it is determined that at least one of the coverage relationships is the light-loaded base station of the included relationship, One of the light-load base stations including the included relationship is selected as the target base station corresponding to the overload base station.
  • the processor 401 determines that the light-loading base station whose coverage relationship is the included relationship is not present, if there is at least one of the light-loaded base stations whose coverage relationship is the inclusion relationship, the inclusion One of the light-load base stations of the relationship selects the light-weight base station as a target base station corresponding to the overload base station.
  • the processor 401 determines that the light load base station whose coverage relationship is the included relationship does not exist, and the light load base station whose coverage relationship is the inclusion relationship does not exist, if it is determined that at least one The light-loading base station with the coverage relationship being the shared-station cross-coverage relationship, selecting one of the light-load base stations from the light-weight base station of the common-station cross-coverage relationship as a target base station corresponding to the overloaded base station .
  • the processor 401 determines that the light-loading base station with the coverage relationship is the common-station cross-coverage relationship, the processor 401 obtains the light-loaded base station corresponding to each of the overloaded base stations, and serves the overloaded base station. And a number of multi-mode multi-connection user equipment UEs supporting the RAT system of the light-weight base station; determining a maximum value of the number of the multi-mode multi-connection UEs that are obtained, and the maximum value corresponding to the The light load base station serves as a target base station corresponding to the overload base station.
  • the processor 401 determines that there is at least one of the light-load base stations that are the same as the RAT system of the overloaded base station, one of the light-load base stations that is the same as the RAT system of the overloaded base station is selected as the overload base station. Corresponding target base station.
  • the processor 401 acquires a minimum value of the load information of the light-load base station that is the same as the RAT system of the overloaded base station, and determines the light-load base station corresponding to the minimum value as the corresponding Target base station.
  • the processor 401 determines that there is no the light-load base station that is the same as the RAT system of the overload base station, the processor 401 selects the multi-mode multi-connection that uses the overload base station as the serving base station and supports the RAT system of the light-load base station.
  • the light-weight base station with the largest number of UEs serves as a target base station corresponding to the overload base station.
  • the processor 401 balances a part of the overloaded base station to a target base station corresponding to the overloaded base station, as follows:
  • the processor 401 determines the multi-mode multi-connection UE served by the overloaded base station
  • the processor 401 determines, according to the target load quantity, a UE that has established a wireless connection with the target base station in the multi-mode multi-connection UE, and obtains a first set according to the determined UE;
  • the processor 401 determines that the selected load of the target UE is smaller than the target load, determining, by the UE, that the multi-mode multi-connection UE does not establish a radio connection with the target base station, according to the determined UE. Obtaining a second set; selecting the target UE from the second set according to the target load amount and selecting a load quantity of the target UE from the first set, wherein, from the first set and The sum of the load amounts of the target UEs selected by the second set is not less than the target load amount.
  • the processor 401 offloads data of the RAT system supported by the target base station in the load of the target UE to the corresponding target base station.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 401 and various circuits of memory represented by memory 402.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the processor 401 is responsible for managing the bus architecture and general processing, and the memory 402 can store data used by the processor 401 in performing operations.
  • the light-weight base station with the largest overlapping coverage area of the overloaded base station is determined as the target base station corresponding to the overloaded base station, and
  • the partial load balancing of the overloaded base station to the target base station corresponding to the overloaded base station enables a large number of user equipment UEs capable of load balancing, and improves the load balancing effect between the multi-standard networks.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本申请公开了一种负载均衡方法及设备，用以提高多制式网络间的负载均衡效果。该方法为：获取各无线接入技术RAT下各基站的负载信息；根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。

Description

一种负载均衡方法及设备
本申请要求在2015年4月15日提交中国专利局、申请号为201510179112.2、发明名称为“一种负载均衡方法及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种负载均衡方法及设备。
背景技术
随着移动通信网络的发展，很多运营商同时拥有多种制式的网络，针对多种制式网络的管理，3GPP提出了通用无线资源管理(Common Radio Resource Management，简称CRRM)实体，即由CRRM实体作为集中控制节点对多种无线接入技术(Radio Access Technology，简称RAT)集中管理。
专利申请号为201210019107.1的专利中，CRRM获取各RAT各基站的负载信息，并根据负载信息检测出过载基站和轻载基站，在轻载基站中选择目标基站。CRRM向过载基站发送目标均衡用户切换指示消息，并请求目标基站进行资源预留。
其中，优先选择与过载基站制式相同的轻载基站作为目标基站，其次选择与过载基站距离最近的轻载基站作为目标基站。
具体地，若与过载基站制式相同的轻载基站有多个，则在该多个轻载基站中选择与过载基站距离最近的轻载基站作为目标基站；若不存在与过载基站制式相同的轻载基站，选择与过载基站距离最近的轻载基站；若与过载基站距离最近的轻载基站只有一个，则确定该基站为目标基站，否则，在多个与过载基站距离最近的轻载基站中选择负载最轻的轻载基站作为目标基站。
在选择目标基站之后，通过切换和频谱共享对过载基站与目标基站进行负载均衡。
发明人发现，优选根据采用的制式选择目标基站，其次根据与过载基站距离以及轻载基站的负荷选择目标基站，所选择目标基站可能与过载基站的交叠覆盖复用较小，能够被均衡的用户很少，难以达到最优的负载均衡效果。
基于此，需要寻求一种新的负载均衡方法，以提高多制式网络间的负载均衡效果。
发明内容
本申请实施例提供一种负载均衡方法及设备，用以提高多制式网络间的负载均衡效果。
本申请实施例提供的具体技术方案如下：
第一方面，提供了一种负载均衡方法，包括：
获取各无线接入技术RAT下各基站的负载信息；
根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
其中，所述覆盖关系为以下任意一种：
被包含关系，所述过载基站被包含在对应的所述轻载基站内；
包含关系，所述过载基站包含对应的所述轻载基站；
共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
实施中，根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域最大的所述轻载基站为所述过载基站对应的目标基站，包括：
若存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
具体地，若不存在所述覆盖关系为所述被包含关系的所述轻载基站，所述方法还包括：
若存在至少一个所述覆盖关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
具体地，若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，所述方法还包括：
若存在至少一个所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
具体地，若不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，所述方法还包括：
分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；
确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
具体地，选择一个所述轻载基站作为所述过载基站对应的目标基站，包括：
若存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
其中，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述目标基站，包括：
获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
实施中，若不存在与所述过载基站的RAT制式相同的所述轻载基站，所述方法还包括：
选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
实施中，将所述过载基站的部分负载均衡至所述过载基站对应的目标基站，包括：
根据所述过载基站的负载信息确定待均衡的目标负载量；
根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；
将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
具体地，根据所述目标负载量、所述过载基站服务的UE类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，包括：
确定所述过载基站服务的多模式多连接UE；
根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
其中，根据所述目标负载量从确定的多模式多连接UE中选择目标UE，包括：
确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；
根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE的负载的和不小于所述目标负载量。
具体地，若确定选择的所述目标UE的负载的和小于所述目标负载量，所述方法还包括：
确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；
根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
其中，将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的所述目标基站，包括：
将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
第二方面，提供了一种负载均衡设备，包括：
获取模块，用于获取各无线接入技术RAT下各基站的负载信息；
第一确定模块，用于根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
第二确定模块，用于根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
负载均衡模块，用于将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
其中，所述覆盖关系为以下任意一种：
被包含关系，所述过载基站被包含在对应的所述轻载基站内；
包含关系，所述过载基站包含对应的所述轻载基站；
共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
实施中，所述第二确定模块具体用于：
若存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
实施中，所述第二确定模块还用于：
若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且存在至少一个所述覆盖关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
实施中，所述第二确定模块还用于：
若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，且存在至少一个所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
实施中，所述第二确定模块还用于：
若不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
实施中，所述第二确定模块具体用于：
若存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
实施中，所述第二确定模块具体用于：
获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
具体地，所述第二确定模块还用于：
若不存在与所述过载基站的RAT制式相同的所述轻载基站，选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
实施中，所述负载均衡模块具体用于：
根据所述过载基站的负载信息确定待均衡的目标负载量；根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
其中，所述负载均衡模块具体用于：
确定所述过载基站服务的多模式多连接UE；根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
其中，所述负载均衡模块具体用于：
确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE的负载的和不小于所述目标负载量。
实施中，所述负载均衡模块还用于：
若确定选择的所述目标UE的负载的和小于所述目标负载量，确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；
根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
具体地，所述负载均衡模块具体用于：
将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
第三方面，提供了另一种负载均衡设备，该设备主要包括处理器和存储器，其中存储器保存有预设的程序，处理器读取存储器中的程序，按照该程序执行以下过程：
获取各无线接入技术RAT下各基站的负载信息；
根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
其中，所述覆盖关系为以下任意一种：
被包含关系，所述过载基站被包含在对应的所述轻载基站内；
包含关系，所述过载基站包含对应的所述轻载基站；
共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
具体地，处理器根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，若确定存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器若确定不存在所述覆盖关系为所述被包含关系的所述轻载基站，若存在至少一个所述覆盖关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器若确定不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，若确定存在至少一个所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器若确定不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器若确定存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
具体地，处理器获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
具体地，处理器若确定不存在与所述过载基站的RAT制式相同的所述轻载基站，选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
实施中，处理器将所述过载基站的部分负载均衡至所述过载基站对应的目标基站，具体如下：
根据所述过载基站的负载信息确定待均衡的目标负载量；根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
其中，处理器确定所述过载基站服务的多模式多连接UE；
根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
具体地，处理器根据所述目标负载量确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；
根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE的负载的和不小于所述目标负载量。
具体地，处理器若确定选择的所述目标UE的负载的和小于所述目标负载量，确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
具体地，处理器将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
基于上述技术方案，本申请实施例中，根据过载基站分别与对应的每个轻载基站的覆盖关系，确定与过载基站交叠覆盖区域范围最大的轻载基站为过载基站对应的目标基站，将过载基站的部分负载均衡至过载基站对应的目标基站，使得能够进行负载均衡的用户设备UE的数目较多，提高了多制式网络间的负载均衡效果。
附图说明
图1为本申请实施例中负载均衡的详细方法流程示意图；
图2a为本申请实施例中被包含关系示意图；
图2b为本申请实施例中包含关系示意图；
图2c为本申请实施例中共站交叉覆盖关系示意图；
图2d为本申请实施例中不共站交叉覆盖关系示意图；
图3为本申请实施例中负载均衡设备结构示意图；
图4为本申请实施例中另一负载均衡设备结构示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
本申请实施例中，如图1所示，CRRM进行负载均衡的详细方法流程如下：
步骤101：获取各RAT下各基站的负载信息。
步骤102：根据每个基站的负载信息确定过载基站和每个过载基站对应的轻载基站。
其中，根据基站的负载信息确定该基站是过载基站还是轻载基站不是本申请所关注的重点。所有根据负载信息确定基站是否过载的实现方式均可应用于本申请。
一个具体实现中，可以是将基站的负载信息与第一预设门限值进行比较，若超过该第一预设门限值，则确定该基站为过载基站；和/或，将基站的负载信息与第二预设门限值进行比较，若不超过该第二预设门限值，则确定该基站为轻载基站。此处仅为举例说明，实际应用中并不以此为限制。
步骤103：根据过载基站分别与对应的每个轻载基站的覆盖关系，确定与过载基站交叠覆盖区域范围最大的轻载基站为过载基站对应的目标基站。
其中，覆盖关系为以下任意一种：
被包含关系，如图2a所示，过载基站S被包含在对应的轻载基站CN内；
包含关系，如图2b所示，过载基站S包含对应的轻载基站CN；
共站交叉覆盖关系，如图2c所示，过载基站S与对应的轻载基站CN共站且交叉覆盖；
不共站交叉覆盖关系，如图2d所示，过载基站S与对应的轻载基站CN不共站且边缘交叉覆盖。
具体实施例中，根据过载基站分别与对应的每个轻载基站的覆盖关系，确定目标基站时，优先选择覆盖关系为被包含关系的轻载基站，其次选择覆盖关系为包含关系的轻载基站，再其次选择覆盖关系为共站交叉覆盖关系的轻载基站，最后选择覆盖关系为不共站交叉覆盖关系的轻载基站。
具体地，选择过载基站对应的目标基站的过程如下：
若存在至少一个覆盖关系为被包含关系的轻载基站，从被包含关系的轻载基站中选择一个轻载基站作为过载基站对应的目标基站；
若不存在覆盖关系为被包含关系的所述轻载基站，且存在至少一个覆盖关系为包含关系的轻载基站，从该包含关系的轻载基站中选择一个轻载基站作为过载基站对应的目标基站；
若不存在覆盖关系为被包含关系的轻载基站，且不存在覆盖关系为包含关系的轻载基 站，且存在至少一个覆盖关系为共站交叉覆盖关系的轻载基站，从共站交叉覆盖关系的轻载基站中选择一个轻载基站作为过载基站对应的目标基站；
若不存在覆盖关系为被包含关系的轻载基站，且不存在覆盖关系为包含关系的轻载基站，且不存在覆盖关系为共站交叉覆盖关系的轻载基站，根据过载基站服务的用户设备(User Equipment，UE)类型以及轻载基站所支持的RAT制式，从过载基站对应的轻载基站中选择一个作为过载基站对应的目标基站。
优选地，若不存在覆盖关系为被包含关系的轻载基站，且不存在覆盖关系为包含关系的轻载基站，且不存在覆盖关系为共站交叉覆盖关系的轻载基站，按照以下过程选择目标基站：
分别获取每个过载基站对应的轻载基站中，以过载基站为服务基站且支持轻载基站的RAT制式的多模式多连接UE的个数；
确定获取的多模式多连接UE的个数中的最大值，将该最大值对应的轻载基站作为过载基站对应的目标基站。
其中，若最大值对应的轻载基站的个数有多个，则随机选择一个作为目标基站，或者，选择最大值对应的轻载基站中负载最小的轻载站作为目标基站。
其中，若与过载基站为被包含关系的轻载基站有且仅有一个，则将该轻载基站作为过载基站的目标基站。
其中，若不存在覆盖关系为被包含关系的轻载基站，且覆盖关系为包含关系的轻载基站有且仅有一个，则将该轻载基站作为过载基站的目标基站。
其中，若不存在覆盖关系为被包含关系的轻载基站，且不存在覆盖关系为包含关系的轻载基站，且覆盖关系为共站交叉覆盖关系的轻载基站有且仅有一个，则将该轻载基站作为过载基站的目标基站。
优选地，若与过载基站为被包含关系的轻载基站有多个，或者，与过载基站为包含关系的轻载基站有多个，或者，与过载基站为共站交叉覆盖关系的轻载基站有多个，这三种情况下均可按照以下过程从符合特定覆盖关系的多个轻载基站中选择一个作为目标基站：
若存在至少一个与过载基站的RAT制式相同的轻载基站，从与过载基站的RAT制式相同的轻载基站中选择一个作为过载基站对应的目标基站；
若不存在与过载基站的RAT制式相同的轻载基站，选择以过载基站为服务基站且支持轻载基站的RAT制式的多模式多连接UE的个数最多的轻载基站作为过载基站对应的目标基站。
具体实现中，也不排除从符合特定覆盖关系的多个轻载基站中随机选择一个作为目标基站的方式。
其中，若与过载基站的RAT制式相同的轻载基站有且仅有一个，将该轻载基站作为该 过载基站的目标基站。
进一步地，若与过载基站的RAT制式相同的轻载基站有多个，根据与过载基站的RAT制式相同的轻载基站的负载信息选择目标基站，具体如下：
获取与过载基站的RAT制式相同的轻载基站的负载信息中的最小值，将该最小值对应的轻载基站确定为过载基站对应的目标基站。
步骤104：将过载基站的部分负载均衡至该过载基站对应的目标基站。
优选地，根据过载基站的负载信息确定待均衡的目标负载量；根据目标负载量、过载基站服务的UE类型以及过载基站服务的UE的业务类型，确定至少一个目标UE，该至少一个目标UE的负载的和不小于目标负载量；将该至少一个目标UE的负载从过载基站均衡至过载基站对应的目标基站。
具体地，根据目标负载量、过载基站服务的UE类型以及过载基站服务的UE的业务类型，确定至少一个目标UE，具体如下：
确定过载基站服务的多模式多连接UE，根据目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于目标负载量。
该实施例中，优先选择多模式多连接UE为目标UE，多模式多连接UE正在进行的业务类型中，既有目标基站制式支持的业务类型，也有目标基站制式不支持的业务类型。对于目标基站制式支持的业务类型，将其全部或部分业务数据直接分流到目标基站中进行传输即可实现负荷的转移，而对于目标基站制式不支持的业务类型的数据仍然在过载基站中进行传输。而选择非多模多连接UE作为目标UE时需要进行RAT间切换才能实现负载的转移，对用户感受和网络性能影响较大，且需要采用切换方式实现负载均衡，UE的所有业务均需要从过载基站切换到目标基站，这就要求UE的所有业务均为目标基站的网络制式支持的业务类型。优先选择多模式多连接UE为目标UE的方式，避免了RAT间切换带来的切换失败和用户感受的降低，以最小的代价实现了跨RAT的基站间的负荷均衡。
其中，根据目标负载量从确定的多模式多连接UE中选择目标UE，具体如下：
确定多模式多连接UE中已与目标基站建立无线连接的UE，根据确定的UE获得第一集合，根据目标负载量从第一集合中选择目标UE，其中，选择的目标UE的负载的和不小于目标负载量。
进一步地，若确定从第一集合中选择的目标UE的负载的和小于目标负载量，确定多模式多连接UE中未与目标基站建立无线连接的UE，根据确定的UE获得第二集合，根据目标负载量以及从第一集合中选择所述目标UE的负载量，从第二集合中选择目标UE，其中，从第一集合和第二集合选择的目标UE的负载量的和不小于目标负载量。
该实施例中，由于尚未接入目标基站所支持制式网络的UE，需要先接入到目标基站所支持制式网络中，然后才能将目标UE的全部或部分负载由过载基站直接分流到目标基 站中进行传输。相比已在目标基站所支持制式网络中处于连接态的UE(即UE已与目标基站支持制式网络建立连接)，需要增加接入目标基站支持制式网络的信令和流程，且存在接入不成功的风险。因此，优先选择已与目标基站建立无线连接的多模式多连接UE作为目标UE。
具体地，选择目标UE后，将目标UE的负载中对应的目标基站支持的RAT制式的数据分流至对应的目标基站。
本申请实施例中，根据过载基站分别与对应的每个轻载基站的覆盖关系，确定与过载基站交叠覆盖区域范围最大的轻载基站为过载基站对应的目标基站，将过载基站的部分负载均衡至目标基站，相比较于选择相同制式的基站或距离最近的基站或负载最轻的基站为目标基站的方式，可以均衡的UE数较多，在不影响网络性能的同时，均衡效果更好。
并且，在均衡时，不采用切换的方式，而是优先使得具有多模多连接能力的UE，在维持与过载基站无线连接的基础上再与跨制式目标基站建立连接的方式，在不影响网络性能的同时，均衡效果会更好。
本申请实施例中，在选择目标基站时，优先选择被包含关系的轻载基站为目标基站，即过载基站被包含在轻载基站的覆盖范围内，使得过载基站中只要是能够支持目标基站的制式的UE的负载均可被均衡至目标基站，均衡成功的概率较高，且对网络性能指标的影响也较小。
在不存在包含关系的轻载基站的情况下，优先选择被包含关系的轻载基站为目标基站，即过载基站的覆盖范围包含轻载基站的覆盖范围，使得过载基站的支持目标基站的制式的中心UE的负载均可被均衡至目标基站，均衡成功的概率较高，且对网络性能指标的影响也较小。
在不存在包含关系的轻载基站，且不存在被包含关系的轻载基站的情况下，优先选择共站交叉覆盖关系的轻载基站作为目标基站，使得过载基站的支持目标基站的制式的非边缘UE的负载均可被均衡至目标基站，均衡成功的概率较高，且对网络性能指标的影响也较小。
以下通过几个具体实施例对本申请实施例中负载均衡过程进行举例说明。
第一具体实施例：
假设多RAT场景下，过载基站对应的轻载基站有多个，且过载基站仅与其中一个轻载基站的覆盖关系为被包含关系，即过载基站被包含在对应的轻载基站中，且过载基站与被包含关系的轻载基站的制式不相同。
步骤一，CRRM获取各RAT下各基站的负载信息，根据每个基站的负载信息确定过载基站，假设过载基站表示为S，过载基站的制式表示为RAT1；
步骤二，在过载基站S的邻区中，选择负载小于设定门限值的基站作为候选轻载基站， 假设候选轻载基站的个数为N，候选轻载基站分别表示为C1、C2、...、CN，候选轻载基站与过载基站的覆盖关系、制式关系如表1所示：
表1
过载基站 候选轻载基站 覆盖关系 制式关系
S C1 包含关系 相同
S C2 被包含关系 不同
S C3，…,CN-1 不共站交叉覆盖关系 不同
S CN 共站交叉覆盖关系 不同
步骤三，在N个候选轻载基站中，优先选择与过载基站满足被包含关系的候选轻载基站作为目标基站，即选择C2作为目标基站，假设C2所支持的制式为RNT2。
步骤四，根据过载基站所服务的UE的类型以及目标基站的制式确定目标UE的各优先级的选择集合。
具体地，确定以过载基站作为服务基站，且支持RNT2制式的UE的集合，记为集合A；
优先选择集合A中多模式多连接UE且已与目标基站建立无线连接的UE作为目标UE，即第一优先级选择集合A1为{集合A中已与目标基站建立无线连接的多模式多连接UE}；
其次选择集合A中多模式多连接UE且未与目标基站建立无线连接的UE作为目标UE，即第二优先级选择集合A2为{集合A中未与目标基站建立无线连接的多模式多连接UE}；
最后选择集合A中非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型的UE作为目标UE，即第三优先级选择集合A3为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型}。
步骤五，根据过载基站需要均衡的目标负载量，记为LOAD_T，按照各优先级的选择集合的优先级顺序选择目标UE。
具体地，优先选择第一优先级选择集合A1中的UE，集合A1中的各UE按照负载量的大小降序排列，按照排列顺序依次选择集合A1中UE，并更新LOAD_T为LOAD_T减去选择的UE的负载量，直至LOAD_T小于零，结束目标UE选择过程，如果集合A1中已没有可选择的UE，且LOAD_T仍大于零，则继续从第二优先级选择集合A2选择目标UE，集合A2中的各UE按照负载量的大小降序排列；
继续按照排列顺序依次从集合A2中选择UE，并更新LOAD_T为LOAD_T减去选择 的UE的负载量，直至LOAD_T小于零，结束目标UE选择过程；如果集合A2中已没有可选择的UE，且LOAD_T仍大于零，则继续从第三优先级选择集合A3中选择目标UE，集合A3中的各UE按照负载量的大小降序排列；
继续按照排列顺序依次从集合A3中选择UE，并更新LOAD_T为LOAD_T减去选择的UE的负载量，直至LOAD_T小于零，结束目标UE选择过程；如果集合A3中已没有可选择的UE，结束目标UE选择过程。
步骤六，将目标UE的全部或部分负载均衡至目标基站。
具体地，可以采用以下均衡策略中的一种或多种进行负载均衡：
第一种，将已与目标基站建立无线连接的多模式多连接UE的业务数据分流到目标基站中传输；
第二种，将未与目标基站建立无线连接的多模式多连接UE，在目标基站建立无线连接之后，将业务数据分流到目标基站中进行传输；
第三种，在目标基站为目标UE预留切换资源成功后，指示过载基站向非多模式多连接UE且所有业务为目标基站支持的RAT2制式可支持的业务类型的目标UE发送切换命令，通过异系统切换过程切换至目标基站。
第二具体实施例：
假设多RAT场景下，过载基站对应的轻载基站有多个，不存在与过载基站的覆盖关系为被包含关系的轻载基站，且存在两个与过载基站的覆盖关系为包含关系的轻载基站，该两个为包含关系的轻载基站的制式与过载基站的制式不同。
步骤一、步骤二的具体过程参见第一具体实施例中步骤一和步骤二，步骤二获取的候选轻载基站与过载基站的覆盖关系、制式关系如表2所示：
表2
过载基站 候选轻载基站 覆盖关系 制式关系
S   被包含关系  
S C1 包含关系 不同
S C2 包含关系 不同
S C3，…,CN-1 不共站交叉覆盖关系 不同
S CN 共站交叉覆盖关系 不同
步骤三，优先选择与过载基站的覆盖关系为被包含关系的轻载基站，确定不存在被包含关系的轻载基站后，选择与过载基站的覆盖关系为包含关系的轻载基站，确定存在两个为包含关系的轻载基站C1和C2，从两个包含关系的轻载基站中选择一个作为目标基站。
具体地，优先选择两个包含关系的轻载基站中制式与过载基站的制式相同的基站，确定不存在与过载基站的制式相同基站，分别统计每个包含关系的轻载基站中、以过载基站为服务基站且支持该包含关系的轻载基站的制式的多模式多连接UE的数量，假设C1对应的统计获得的数量为MC1，C2对应的统计获得的数据为MC2，比较MC1和MC2，如果MC1>MC2，选择C1作为目标基站；如果MC1<MC2，选择C2作为目标基站；如果MC1＝MC2，选择C1和C2中负载最轻的基站作为目标基站，假设目标基站支持的制式为RAT2，过载基站支持的制式为RAT1。
步骤四，根据过载基站所服务的UE的类型以及目标基站的制式确定目标UE的各优先级的选择集合。
具体地，确定以过载基站作为服务基站，且支持RNT2制式的UE的集合，记为集合A；
优先选择集合A中多模式多连接UE且已与目标基站建立无线连接的UE作为目标UE，即第一优先级选择集合A1为{集合A中已与目标基站建立无线连接的多模式多连接UE}；
其次选择集合A中多模式多连接UE且未与目标基站建立无线连接的UE作为目标UE，即第二优先级选择集合A2为{集合A中未与目标基站建立无线连接的多模式多连接UE}，具体地，优先选择处于过载基站中心覆盖区位置的UE，比如UE接收功率大于设定门限值时确定位于基站中心覆盖区，因为处于过载基站的中心覆盖区的UE，处于目标基站的覆盖范围的概率较大，成功接入到目标基站的概率较高，即集合A2中第一优先级子集合A21为{集合A中未与目标基站建立无线连接、且处于过载基站中心覆盖区的多模多连接UE}，集合A2中的第二优先级子集合A22为{集合A中未与目标基站建立无线连接、且处于过载基站非中心覆盖区的多模多连接UE}；
最后选择集合A中非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型的UE作为目标UE，即第三优先级选择集合A3为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型}，具体地，优先选择处于过载基站中心覆盖区位置的UE，比如UE接收功率大于设定门限值时确定位于基站中心覆盖区，因为处于过载基站的中心覆盖区的UE，处于目标基站的覆盖范围的概率较大，在目标基站的信号功率或信号质量满足设定的切换条件的概率较高，即集合A3中第一优先级子集合A31为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型，且处于过载基站的中心覆盖区}，集合A3中第二优先级子集合A32为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型，且处于过载基站的非中心覆盖区}。
步骤五～步骤六可参见第一具体实施例中的步骤五和步骤六的执行过程，此处不再详 述。
第三具体实施例：
假设多RAT场景下，过载基站对应的轻载基站有多个，且不存在与过载基站为被包含关系的轻载基站，且不存在与过载基站为包含关系的轻载基站，存在两个与过载基站为共站交叉覆盖关系的轻载基站，且两个为共站交叉覆盖关系的轻载基站的制式与过载基站的制式不同。
步骤一、步骤二的具体过程参见第一具体实施例中步骤一和步骤二，步骤二获取的候选轻载基站与过载基站的覆盖关系、制式关系如表3所示：
表3
过载基站 候选轻载基站 覆盖关系 制式关系
S   被包含关系  
S   包含关系  
S C1 共站交叉覆盖关系 不同
S C2…,CN-1 共站交叉覆盖关系 不同
S CN 共站交叉覆盖关系 不同
步骤三，优先选择与过载基站的覆盖关系为被包含关系的轻载基站，确定不存在被包含关系的轻载基站后，次优选择与过载基站的覆盖关系为包含关系的轻载基站，确定不存在包含关系的轻载基站后，次优选择与过载基站的覆盖关系为共站交叉覆盖关系的轻载基站，确定存在两个为共站交叉覆盖关系的轻载基站C1和CN，从轻载基站C1和CN中选择一个作为目标基站。
具体地，优先选择两个共站交叉覆盖关系的轻载基站中制式与过载基站的制式相同的基站，确定不存在与过载基站的制式相同基站，分别统计每个包含关系的轻载基站中、以过载基站为服务基站且支持该包含关系的轻载基站的制式的多模式多连接UE的数量，假设C1对应的统计获得的数量为MC1，CN对应的统计获得的数据为MCN，比较MC1和MCN，如果MC1>MCN，选择C1作为目标基站；如果MC1<MCN，选择CN作为目标基站；如果MC1＝MCN，选择C1和CN中负载最轻的基站作为目标基站，假设目标基站支持的制式为RAT2，过载基站支持的制式为RAT1。
步骤四，根据过载基站所服务的UE的类型以及目标基站的制式确定目标UE的各优先级的选择集合。
具体地，确定以过载基站作为服务基站，且支持RNT2制式的UE的集合，记为集合A；
优先选择集合A中多模式多连接UE且已与目标基站建立无线连接的UE作为目标UE，即第一优先级选择集合A1为{集合A中已与目标基站建立无线连接的多模式多连接UE}；
其次选择集合A中多模式多连接UE且未与目标基站建立无线连接的UE作为目标UE，即第二优先级选择集合A2为{集合A中未与目标基站建立无线连接的多模式多连接UE}；
最后选择集合A中非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型的UE作为目标UE，即第三优先级选择集合A3为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型}。
步骤五～步骤六可参见第一具体实施例中的步骤五和步骤六的执行过程，此处不再详述。
第四具体实施例：
假设多RAT场景下，过载基站对应的轻载基站有多个，且不存在与过载基站为被包含关系的轻载基站，且不存在与过载基站为包含关系的轻载基站，且不存在与过载基站为共站交叉覆盖关系的轻载基站，且存在两个与过载基站为不共站交叉覆盖关系的轻载基站，且两个不共站交叉覆盖关系的轻载基站的制式与过载基站的制式不同。
步骤一、步骤二的具体过程参见第一具体实施例中步骤一和步骤二，步骤二获取的候选轻载基站与过载基站的覆盖关系、制式关系如表4所示：
表4
过载基站 候选轻载基站 覆盖关系 制式关系
S   被包含关系  
S   包含关系  
S   共站交叉覆盖关系  
S C1 不共站交叉覆盖关系 不同
S C2 不共站交叉覆盖关系 不同
步骤三，优先选择与过载基站的覆盖关系为被包含关系的轻载基站，确定不存在被包含关系的轻载基站后，次优选择与过载基站的覆盖关系为包含关系的轻载基站，确定不存在包含关系的轻载基站后，次优选择与过载基站的覆盖关系为共站交叉覆盖关系的轻载基站，确定不存在共站交叉覆盖关系的轻载基站，最后选择与过载基站的覆盖关系为不共站交叉覆盖关系的轻载基站，确定存在两个为不共站交叉覆盖关系的轻载基站C1和C2，从轻载基站C1和C2中选择一个作为目标基站。
从轻载基站C1和C2中选择一个作为目标基站的具体方式参见第一实施例中步骤三的描述。
步骤四，根据过载基站所服务的UE的类型以及目标基站的制式确定目标UE的各优先级的选择集合。
具体地，确定以过载基站作为服务基站，且支持RNT2制式的UE的集合，记为集合A；
优先选择集合A中多模式多连接UE且已与目标基站建立无线连接的UE作为目标UE，即第一优先级选择集合A1为{集合A中已与目标基站建立无线连接的多模式多连接UE}；
其次选择集合A中多模式多连接UE且未与目标基站建立无线连接的UE作为目标UE，即第二优先级选择集合A2为{集合A中未与目标基站建立无线连接的多模式多连接UE}，具体地，优先选择集合A2中处于过载基站非中心覆盖区域的UE，因为过载基站的非中心覆盖区域的UE位于目标基站的覆盖范围的概率较大，成功接入到目标基站的概率较高，即集合A2中的第一优先级子集合A21为{集合A中未与目标基站建立无线连接、且处于过载基站非中心覆盖区域的多模多连接UE}，集合A2中的第二优先级子集合A22为{集合A中未与目标基站建立无线连接、且处于过载基站中心覆盖区的多模多连接UE}；
最后选择集合A中非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型的UE作为目标UE，即第三优先级选择集合A3为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型}，具体地，优先选择集合A3中处于过载基站非中心覆盖区域的UE，因为过载基站的非中心覆盖区域的UE位于目标基站的覆盖范围的概率较大，在目标基站的信号功率或信号质量满足切换设定条件的概率较高，即集合A3中第一优先级子集合A31为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型，且处于过载基站的非中心覆盖区}，集合A3中第二优先级子集合A32为{集合A中的非多模式多连接UE，且所有业务为目标基站支持的RAT2制式可支持的业务类型，且处于过载基站的中心覆盖区}。
步骤五～步骤六可参见第一具体实施例中的步骤五和步骤六的执行过程，此处不再详述。
本申请实施例中，将过载基站与对应的轻载基站间的覆盖关系作为优先考虑因素确定目标基站，可以均衡的UE数较多，均衡效果更好。另外在相同覆盖关系且与过载基站不同制式的轻载基站中，优先选择将过载基站作为服务基站支持轻载基站制式的多模多连接UE数量最大的基站作为目标基站，结合优先让具有多模多连接能力的UE在维持与过载基站无线连接的基础上再与跨制式目标基站建立连接，之后将其业务数据进行分流实现负荷均衡的方式，可以避免RAT间切换带来的切换失败和用户感受的降低，以最小的代价实现 了RAT间的负载均衡。
基于同一发明构思，本申请实施例中还提供了一种负载均衡设备，该负载均衡设备的具体实施可参见上述方法部分的描述，重复之处不再赘述，如图3所示，该负载均衡设备主要包括：
获取模块301，用于获取各无线接入技术RAT下各基站的负载信息；
第一确定模块302，用于根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
第二确定模块303，用于根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
负载均衡模块304，用于将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
其中，第一确定模块根据基站的负载信息确定该基站是过载基站还是轻载基站不是本申请所关注的重点。所有根据负载信息确定基站是否过载的实现方式均可应用于第一确定模块。
一个具体实现中，第一确定模块将基站的负载信息与第一预设门限值进行比较，若超过该第一预设门限值，则确定该基站为过载基站；和/或，将基站的负载信息与第二预设门限值进行比较，若不超过该第二预设门限值，则确定该基站为轻载基站。此处仅为举例说明，实际应用中并不以此为限制。
其中，所述覆盖关系为以下任意一种：
被包含关系，所述过载基站被包含在对应的所述轻载基站内；
包含关系，所述过载基站包含对应的所述轻载基站；
共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
具体实施例中，所述第二确定模块根据过载基站分别与对应的每个轻载基站的覆盖关系，确定目标基站时，优先选择覆盖关系为被包含关系的轻载基站，其次选择覆盖关系为包含关系的轻载基站，再其次选择覆盖关系为共站交叉覆盖关系的轻载基站，最后选择覆盖关系为不共站交叉覆盖关系的轻载基站。
具体地，所述第二确定模块具体用于：
若存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
所述第二确定模块还用于：
若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且存在至少一个所述覆盖 关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
所述第二确定模块还用于：
若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，且存在至少一个所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
所述第二确定模块还用于：
若不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
优选地，若与过载基站为被包含关系的轻载基站有多个，或者，与过载基站为包含关系的轻载基站有多个，或者，与过载基站为共站交叉覆盖关系的轻载基站有多个，这三种情况下所述第二确定模块具体用于：
若存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
其中，所述第二确定模块具体用于：
获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
所述第二确定模块还用于：
若不存在与所述过载基站的RAT制式相同的所述轻载基站，选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
实施中，若与过载基站为被包含关系的轻载基站有多个，或者，与过载基站为包含关系的轻载基站有多个，或者，与过载基站为共站交叉覆盖关系的轻载基站有多个，第二确定模块也不排除从符合特定覆盖关系的多个轻载基站中随机选择一个作为目标基站的方式。
实施中，所述负载均衡模块具体用于：
根据所述过载基站的负载信息确定待均衡的目标负载量；根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
其中，所述负载均衡模块具体用于：
确定所述过载基站服务的多模式多连接UE；根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
其中，所述负载均衡模块具体用于：
确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE的负载的和不小于所述目标负载量。
其中，所述负载均衡模块还用于：
若确定选择的所述目标UE的负载的和小于所述目标负载量，确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
其中，所述负载均衡模块具体用于：将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
实施中，该实施例所提供的负载均衡设备为CRRM实体，或者，该负载均衡设备集成有实现CRRM实体功能的功能模块。
基于同一发明构思，本申请实施例中还提供了另一种负载均衡设备，该设备的具体实施可参见上述方法部分的描述，重复之处不再赘述，如图4所示，该设备主要包括处理器401和存储器402，其中存储器402中保存有预设的程序，处理器401读取存储器402中的程序，按照该程序执行以下过程：
获取各无线接入技术RAT下各基站的负载信息；
根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
其中，处理器根据基站的负载信息确定该基站是过载基站还是轻载基站不是本申请所关注的重点。所有根据负载信息确定基站是否过载的实现方式均可应用于本申请。
一个具体实现中，处理器将基站的负载信息与第一预设门限值进行比较，若超过该第一预设门限值，则确定该基站为过载基站；和/或，将基站的负载信息与第二预设门限值进行比较，若不超过该第二预设门限值，则确定该基站为轻载基站。此处仅为举例说明，实际应用中并不以此为限制。
其中，所述覆盖关系为以下任意一种：
被包含关系，所述过载基站被包含在对应的所述轻载基站内；
包含关系，所述过载基站包含对应的所述轻载基站；
共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
其中，处理器根据过载基站分别与对应的每个轻载基站的覆盖关系，确定目标基站时，优先选择覆盖关系为被包含关系的轻载基站，其次选择覆盖关系为包含关系的轻载基站，再其次选择覆盖关系为共站交叉覆盖关系的轻载基站，最后选择覆盖关系为不共站交叉覆盖关系的轻载基站。
具体地，处理器401根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，若确定存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器401若确定不存在所述覆盖关系为所述被包含关系的所述轻载基站，若存在至少一个所述覆盖关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器401若确定不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，若确定存在至少一个所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器401若确定不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
其中，处理器401若确定存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
具体地，处理器401获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
具体地，处理器401若确定不存在与所述过载基站的RAT制式相同的所述轻载基站，选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
实施中，处理器401将所述过载基站的部分负载均衡至所述过载基站对应的目标基站，具体如下：
根据所述过载基站的负载信息确定待均衡的目标负载量；根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
其中，处理器401确定所述过载基站服务的多模式多连接UE；
根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
具体地，处理器401根据所述目标负载量确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；
根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE的负载的和不小于所述目标负载量。
具体地，处理器401若确定选择的所述目标UE的负载的和小于所述目标负载量，确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
具体地，处理器401将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
其中，在图4中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器401代表的一个或多个处理器和存储器402代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。
处理器401负责管理总线架构和通常的处理，存储器402可以存储处理器401在执行操作时所使用的数据。
基于上述技术方案，本申请实施例中，根据过载基站分别与对应的每个轻载基站的覆盖关系，确定与过载基站交叠覆盖区域范围最大的轻载基站为过载基站对应的目标基站，将过载基站的部分负载均衡至过载基站对应的目标基站，使得能够进行负载均衡的用户设备UE的数目较多，提高了多制式网络间的负载均衡效果。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (28)

  1. 一种负载均衡方法，其特征在于，包括：
    获取各无线接入技术RAT下各基站的负载信息；
    根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
    根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
    将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
  2. 如权利要求1所述的方法，其特征在于，所述覆盖关系为以下任意一种：
    被包含关系，所述过载基站被包含在对应的所述轻载基站内；
    包含关系，所述过载基站包含对应的所述轻载基站；
    共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
    不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
  3. 如权利要求2所述的方法，其特征在于，根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域最大的所述轻载基站为所述过载基站对应的目标基站，包括：
    若存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
  4. 如权利要求3所述的方法，其特征在于，若不存在所述覆盖关系为所述被包含关系的所述轻载基站，所述方法还包括：
    若存在至少一个所述覆盖关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
  5. 如权利要求4所述的方法，其特征在于，若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，所述方法还包括：
    若存在至少一个所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
  6. 如权利要求5所述的方法，其特征在于，若不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，所述方法还包括：
    分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；
    确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
  7. 如权利要求3-5任一项所述的方法，其特征在于，选择一个所述轻载基站作为所述过载基站对应的目标基站，包括：
    若存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
  8. 如权利要求7所述的方法，其特征在于，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述目标基站，包括：
    获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
  9. 如权利要求7所述的方法，其特征在于，若不存在与所述过载基站的RAT制式相同的所述轻载基站，所述方法还包括：
    选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
  10. 如权利要求1-6任一项所述的方法，其特征在于，将所述过载基站的部分负载均衡至所述过载基站对应的目标基站，包括：
    根据所述过载基站的负载信息确定待均衡的目标负载量；
    根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；
    将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
  11. 如权利要求10所述的方法，其特征在于，根据所述目标负载量、所述过载基站服务的UE类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，包括：
    确定所述过载基站服务的多模式多连接UE；
    根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
  12. 如权利要求11所述的方法，其特征在于，根据所述目标负载量从确定的多模式多连接UE中选择目标UE，包括：
    确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；
    根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE的负载的和不小于所述目标负载量。
  13. 如权利要求12所述的方法，其特征在于，若确定选择的所述目标UE的负载的和小于所述目标负载量，所述方法还包括：
    确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；
    根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
  14. 如权利要求11、12或13所述的方法，其特征在于，将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的所述目标基站，包括：
    将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
  15. 一种负载均衡设备，其特征在于，包括：
    获取模块，用于获取各无线接入技术RAT下各基站的负载信息；
    第一确定模块，用于根据每个所述基站的负载信息确定过载基站和每个过载基站对应的轻载基站；
    第二确定模块，用于根据所述过载基站分别与对应的每个所述轻载基站的覆盖关系，确定与所述过载基站交叠覆盖区域范围最大的所述轻载基站为所述过载基站对应的目标基站；
    负载均衡模块，用于将所述过载基站的部分负载均衡至所述过载基站对应的所述目标基站。
  16. 如权利要求15所述的设备，其特征在于，所述覆盖关系为以下任意一种：
    被包含关系，所述过载基站被包含在对应的所述轻载基站内；
    包含关系，所述过载基站包含对应的所述轻载基站；
    共站交叉覆盖关系，所述过载基站与对应的所述轻载基站共站且交叉覆盖；
    不共站交叉覆盖关系，所述过载基站与对应的所述轻载基站不共站且边缘交叉覆盖。
  17. 如权利要求16所述的设备，其特征在于，所述第二确定模块具体用于：
    若存在至少一个所述覆盖关系为所述被包含关系的所述轻载基站，从所述被包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
  18. 如权利要求17所述的设备，其特征在于，所述第二确定模块还用于：
    若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且存在至少一个所述覆盖关系为所述包含关系的所述轻载基站，从所述包含关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
  19. 如权利要求18所述的设备，其特征在于，所述第二确定模块还用于：
    若不存在所述覆盖关系为所述被包含关系的所述轻载基站，且不存在所述覆盖关系为所述包含关系的所述轻载基站，且存在至少一个所述覆盖关系为所述共站交叉覆盖关系的 所述轻载基站，从所述共站交叉覆盖关系的所述轻载基站中选择一个所述轻载基站作为所述过载基站对应的目标基站。
  20. 如权利要求19所述的设备，其特征在于，所述第二确定模块还用于：
    若不存在所述覆盖关系为所述共站交叉覆盖关系的所述轻载基站，分别获取每个所述过载基站对应的轻载基站中，以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接用户设备UE的个数；
    确定获取的所述多模式多连接UE的个数中的最大值，将所述最大值对应的所述轻载基站作为所述过载基站对应的目标基站。
  21. 如权利要求17-19任一项所述的设备，其特征在于，所述第二确定模块具体用于：
    若存在至少一个与所述过载基站的RAT制式相同的所述轻载基站，从与所述过载基站的RAT制式相同的所述轻载基站中选择一个作为所述过载基站对应的目标基站。
  22. 如权利要求21所述的设备，其特征在于，所述第二确定模块具体用于：
    获取与所述过载基站的RAT制式相同的所述轻载基站的负载信息中的最小值，将所述最小值对应的所述轻载基站确定为所述过载基站对应的目标基站。
  23. 如权利要求21所述的设备，其特征在于，所述第二确定模块还用于：
    若不存在与所述过载基站的RAT制式相同的所述轻载基站，选择以所述过载基站为服务基站且支持所述轻载基站的RAT制式的多模式多连接UE的个数最多的所述轻载基站作为所述过载基站对应的目标基站。
  24. 如权利要求15-20任一项所述的设备，其特征在于，所述负载均衡模块具体用于：
    根据所述过载基站的负载信息确定待均衡的目标负载量；
    根据所述目标负载量、所述过载基站服务的用户设备类型以及所述过载基站服务的UE的业务类型，确定至少一个目标UE，所述至少一个目标UE的负载的和不小于所述目标负载量；
    将所述至少一个目标UE的负载从所述过载基站均衡至所述过载基站对应的目标基站。
  25. 如权利要求24所述的设备，其特征在于，所述负载均衡模块具体用于：
    确定所述过载基站服务的多模式多连接UE；
    根据所述目标负载量从确定的多模式多连接UE中选择目标UE，其中，选择的目标UE的负载的和不小于所述目标负载量。
  26. 如权利要求25所述的设备，其特征在于，所述负载均衡模块具体用于：
    确定所述多模式多连接UE中已与所述目标基站建立无线连接的UE，根据确定的UE获得第一集合；
    根据所述目标负载量从所述第一集合中选择所述目标UE，其中，选择的所述目标UE 的负载的和不小于所述目标负载量。
  27. 如权利要求26所述的设备，其特征在于，所述负载均衡模块还用于：
    若确定选择的所述目标UE的负载的和小于所述目标负载量，确定所述多模式多连接UE中未与所述目标基站建立无线连接的UE，根据确定的UE获得第二集合；
    根据所述目标负载量以及从所述第一集合中选择所述目标UE的负载量，从所述第二集合中选择所述目标UE，其中，从所述第一集合和所述第二集合选择的所述目标UE的负载量的和不小于所述目标负载量。
  28. 如权利要求25、26或27所述的设备，其特征在于，所述负载均衡模块具体用于：
    将所述目标UE的负载中对应的所述目标基站支持的RAT制式的数据分流至对应的所述目标基站。
PCT/CN2016/078827 2015-04-15 2016-04-08 一种负载均衡方法及设备 Ceased WO2016165585A1 (zh)

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