WO2016184102A1 - 基站选择方法及装置 - Google Patents

基站选择方法及装置 Download PDF

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Publication number
WO2016184102A1
WO2016184102A1 PCT/CN2015/098480 CN2015098480W WO2016184102A1 WO 2016184102 A1 WO2016184102 A1 WO 2016184102A1 CN 2015098480 W CN2015098480 W CN 2015098480W WO 2016184102 A1 WO2016184102 A1 WO 2016184102A1
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WO
WIPO (PCT)
Prior art keywords
base station
channel quality
user equipment
base stations
quality information
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PCT/CN2015/098480
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English (en)
French (fr)
Inventor
柯雅珠
程翔
窦建武
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中兴通讯股份有限公司
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Publication of WO2016184102A1 publication Critical patent/WO2016184102A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for selecting a base station.
  • the main means of improving network throughput include increasing the transmission rate of point-to-point links, spreading spectrum resources, and deploying heterogeneous networks with high density; among them, high-density deployment of heterogeneous networks will support 20 to 30 times of current traffic.
  • UDN Ultra Dense Network
  • the spatial multiplexing rate of spectrum resources is increased by reducing the coverage area of the cell.
  • the UDN station can provide good link quality, it is small. The coverage of the station is very small and cannot support the fast movement of users.
  • the virtual cell is composed of three base stations (BS), and one user equipment (Use Equipment, UE for short) is connected to the three base stations.
  • BS base stations
  • UE User Equipment
  • One of them is a primary serving base station (Master-BS).
  • Master-BS primary serving base station
  • Slave-BS slave service base stations
  • the existing technical control plane signaling is still sent to the user at the primary serving base station (Master-BS), that is, the network side only needs to select the primary serving base station to perform control plane signaling transmission.
  • Master-BS primary serving base station
  • the primary serving base station is also a small cell
  • Such frequent Master-BS changes not only involve frequent synchronization of control plane signaling and user plane data, but are not conducive to the L2 virtualization process. Therefore, the control plane signaling can also be transmitted in the manner shown in FIG.
  • control plane signaling can select one node for transmission in the set of base stations constructed in the virtual cell, and is not limited to only the primary service.
  • the base station or the primary serving node transmits.
  • the present invention provides a method and apparatus for selecting a base station to at least solve the problem of how to ensure that control plane signaling can be reliably received by the receiving end in the virtual cell in the related art.
  • a base station selection method including: acquiring, by a network element, channel quality information, where the channel quality information is a channel quality between a primary base station and one or more secondary base stations and user equipments Information, the one or more secondary base stations are secondary base stations corresponding to the primary base station; the network element acquires load information of the primary base station and the one or more secondary base stations; and the network element is configured according to the channel quality information and the load information. And selecting a designated base station from the foregoing primary base station and the one or more secondary base stations, wherein the designated base station is a base station that performs control signaling transmission with the user equipment.
  • the channel quality between the specified base station and the user equipment is greater than a first threshold, and the load of the designated base station is less than a second threshold.
  • the acquiring, by the network element, the channel quality information includes: when the network element is the primary base station, the primary base station acquiring the channel quality information from the user equipment, or the primary base station is from the one or more The secondary base station acquires the channel quality information; or, when the network element is the user equipment, the channel quality information is measured by the user equipment.
  • the channel quality information includes at least one of a signal strength or a signal to interference ratio of the reference signal, a signal strength of the pilot signal, or a signal to interference ratio.
  • the foregoing load information includes at least one of the following: a sum of used resources of the primary base station or the one or more secondary base stations, a sum of remaining available resources of the primary base station or the one or more secondary base stations, and the foregoing Interference information of the base station or one or more of the foregoing secondary base stations.
  • the acquiring, by the network element, the load information of the primary base station and the one or more secondary base stations includes: when the network element is the user equipment, the user equipment acquires the load information by using a system broadcast message.
  • a base station selection apparatus is further provided, where the apparatus is applied to a network element, where the apparatus includes: a first acquiring module, configured to acquire channel quality information, where the channel quality information is mainly The channel quality information between the base station and the one or more secondary base stations and the user equipment, the one or more secondary base stations are secondary base stations corresponding to the primary base station, and the second obtaining module is configured to acquire the primary base station and the one or the foregoing The load information of the plurality of secondary base stations; the selecting module is configured to select the designated base station from the primary base station and the one or more secondary base stations according to the channel quality information and the load information, where the designated base station is configured with the user equipment A base station that controls signaling transmission.
  • the channel quality between the specified base station and the user equipment is greater than a first threshold, and the load of the designated base station is less than a second threshold.
  • the first acquiring module is further configured to: when the network element is the primary base station, obtain the channel quality information from the user equipment, or obtain the channel quality information from the one or more secondary base stations. ; or When the network element is the user equipment, the channel quality information is measured by the user equipment.
  • the channel quality information includes at least one of a signal strength or a signal to interference ratio of the reference signal, a signal strength of the pilot signal, or a signal to interference ratio.
  • the foregoing load information includes at least one of the following: a sum of used resources of the primary base station or the one or more secondary base stations, a sum of remaining available resources of the primary base station or the one or more secondary base stations, and the foregoing Interference information of the base station or one or more of the foregoing secondary base stations.
  • the foregoing second obtaining module is further configured to: when the network element is the user equipment, acquire the load information by using a system broadcast message.
  • the network quality information is obtained by using the network element, where the channel quality information is the channel quality information between the primary base station and one or more secondary base stations and the user equipment, and the one or more secondary base stations are corresponding to the primary base station.
  • a secondary base station the network element acquires load information of the primary base station and the one or more secondary base stations; the network element selects a designated base station from the primary base station and one or more secondary base stations according to channel quality information and load information, where the designated base station is A base station that performs control signaling transmission with the user equipment.
  • FIG. 1 is a schematic diagram of virtual cell control signaling transmission when an ultra-dense cell is deployed
  • FIG. 2 is a schematic diagram of multi-node transmission of virtual cell control signaling when an ultra-dense cell is deployed;
  • FIG. 3 is a flowchart of a base station selection method according to an embodiment of the present invention.
  • FIG. 4 is a structural block diagram of a base station selection apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram 1 of a method for determining downlink signaling transmission by a network side according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram 2 of a method for determining downlink signaling transmission by a network side according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram 1 of a method for a user equipment to determine uplink signaling transmission according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram 2 of a method for a user equipment to determine uplink signaling transmission according to an embodiment of the present invention.
  • FIG. 3 is a flow of a base station selection method according to an embodiment of the present invention.
  • the process diagram, as shown in Figure 3, includes the following steps:
  • Step S302 the network element acquires channel quality information, where the channel quality information is channel quality information between the primary base station and one or more secondary base stations and the user equipment, and the one or more secondary base stations are secondary base stations corresponding to the primary base station;
  • Step S304 the network element acquires load information of the primary base station and one or more secondary base stations.
  • Step S306 the network element selects a designated base station from the primary base station and one or more secondary base stations according to the channel quality information and the load information, where the designated base station is a base station that performs control signaling transmission with the user equipment.
  • the network element may select a designated base station that performs control plane signaling transmission with the user equipment according to the channel quality information between the base stations and the device and the load information of each base station, and only selects the network side in the related art.
  • the primary base station performs control plane signaling, and the foregoing steps solve the problem of how to ensure that the control plane signaling can be reliably received by the receiving end in the virtual cell in the related art, thereby avoiding the problem caused by frequent replacement of the primary base station, and reducing the problem.
  • the specified base station is selected by the foregoing steps.
  • the following conditions are met, the channel quality between the designated base station and the user equipment is greater than the first threshold, and the load of the designated base station is less than the second threshold.
  • the most suitable base station and the user equipment are selected from the primary base station and one or more secondary base stations for transmission of control plane data.
  • the foregoing step S302 involves the network element acquiring the channel quality information, where the network element may be the primary base station or the user equipment.
  • the primary base station acquires the channel from the user equipment.
  • the quality information where the channel quality information is obtained by the user equipment, or the primary base station obtains channel quality information from one or more secondary base stations, where the channel quality information is obtained by monitoring one or more secondary base stations.
  • the network element is a user equipment, the channel quality information is measured by the user equipment.
  • the above channel quality information may contain a variety of information, which will be exemplified below.
  • the channel quality information may be the signal strength or the signal to interference ratio of the reference signal, or the signal strength or the signal to interference ratio of the pilot signal.
  • the above load information may also contain a variety of information, which will be exemplified below.
  • the load information may be the sum of used resources of the primary base station or one or more secondary base stations, or may be the sum of remaining available resources of the primary base station or one or more secondary base stations, or may be the primary Interference information of a base station or one or more secondary base stations.
  • the user equipment acquires the foregoing load information by using a system broadcast message.
  • a base station selection device is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and has not been described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • the apparatus is applied to a network element, as shown in FIG.
  • the device includes: a first obtaining module 42 configured to acquire channel quality information, where channel quality information is channel quality information between the primary base station and one or more secondary base stations and user equipment, and one or more secondary base stations are a secondary base station corresponding to the primary base station; the second obtaining module 44 is configured to acquire load information of the primary base station and one or more secondary base stations; and the selecting module 46 is configured to: from the primary base station and one or according to the channel quality information and the load information A designated base station is selected among a plurality of secondary base stations, wherein the designated base station is a base station that performs control signaling transmission with the user equipment.
  • the channel quality between the designated base station and the user equipment is greater than a first threshold, and the load of the designated base station is less than a second threshold.
  • the first obtaining module 42 is further configured to: obtain channel quality information from the user equipment, or obtain channel quality information from one or more secondary base stations, if the network element is the primary base station; or In the case where the network element is the user equipment, channel quality information is measured by the user equipment.
  • the channel quality information includes at least one of: a signal strength or a signal to interference ratio of the reference signal, a signal strength of the pilot signal, or a signal to interference ratio.
  • the load information includes at least one of: a sum of used resources of the primary base station or the one or more secondary base stations, a sum of remaining available resources of the primary base station or the one or more secondary base stations, a primary base station, or Interference information of one or more secondary base stations.
  • the second obtaining module 42 is further configured to obtain the load information by using a system broadcast message when the network element is a user equipment.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the first obtaining module 42, the second obtaining module 44, and the selecting module 46 are located. In the same processor; or, the first obtaining module 42, the second obtaining module 44, and the selecting module 46 are located in the first processor, the second processor, and the third processor, respectively.
  • the network side selects the downlink signaling transmission channel:
  • Step 1 The Master-BS determines the radio resource control based on the channel quality between the node and the user equipment in the base station set constituting the virtual cell and the load condition of the node in the base station set of the virtual cell (Radio Resource Control, referred to as Base station for signaling of the RRC) layer;
  • Radio Resource Control referred to as Base station for signaling of the RRC
  • Step 2 When the Master-BS sends an RRC signaling message, the base station selected by the Step Master-BS is used as a channel for sending to the user equipment.
  • the channel quality between the node and the user equipment in the set of base stations constituting the virtual cell may be measured by the user equipment, or may be monitored by the respective base station node and transmitted to the Master-BS;
  • the factor for measuring channel quality may be a signal strength or a signal to interference ratio of the reference signal, or a signal strength or a signal to interference ratio of the pilot signal;
  • the non-Master-BS base station in the set of base stations that construct the virtual cell needs to transmit the load information of the cell to the Master-BS, where the load information may include, but is not limited to, the sum of the used resources, or the sum of the remaining available resources, Or interfere with the size, or load status (such as high, medium, low);
  • the detailed method for the Master-BS to select the signaling delivery channel includes:
  • the node with the best signal strength between the user and the user equipment is selected, and the interference is minimal and the remaining resources may be sent to the node of the Protocol Data Unit (PDU). send;
  • PDU Protocol Data Unit
  • the signal strength between the user equipment and the user equipment is selected to be the best, and the remaining resources can send signaling PDUs, and the nodes with relatively acceptable interference (such as interference less than or less than the determined threshold 1) are sent;
  • the signal strength between the user and the user equipment can be selected by the user equipment (such as the signal strength is greater than or equal to the determined threshold 2), and the interference is minimal and the remaining resources can be sent.
  • the remaining resources may be selected to send signaling PDUs, and the signal strength between the user and the user equipment may be received by the user equipment (such as the signal strength is greater than or equal to the determined threshold 2), and A node with relatively acceptable interference (such as interference less than or less than the determined threshold 1) is transmitted.
  • the method for the Master-BS to select the signaling delivery channel may also be:
  • the node with the lowest signal strength between the user and the user equipment is selected, and the node with the lowest load is received;
  • the signal strength between the user and the user equipment is determined to reach a certain threshold, and the node with the lowest load receives;
  • the signal strength between the user and the user equipment is determined to reach a certain threshold, and the node with medium load receives;
  • the node whose signal strength between the user and the user equipment reaches a certain threshold is selected, and the node with a relatively high load receives.
  • the signaling PDU of an RRC message needs to be completely sent in one node
  • control plane of the master-BS needs to notify the user of a channel that the RRC message needs to be transmitted, such as a target base station identifier or a cell identifier.
  • Step 1 The channel quality between the node and the user equipment in the set of base stations constituting the virtual cell by the user equipment And determining, by the load condition of the node in the set of base stations of the virtual cell, a base station that receives signaling of the RRC layer;
  • Step 2 When the RRC signaling message is sent, the base station selected by the user equipment is used as a channel for receiving the RRC signaling message.
  • the channel quality between the node in the set of base stations constituting the virtual cell and the user equipment may be measured by the user equipment itself, and the latest measurement result is saved;
  • the factor for measuring channel quality may be a signal strength or a signal to interference ratio of the reference signal, or a signal strength or a signal to interference ratio of the pilot signal;
  • the threshold used by the user equipment to monitor the channel quality status also needs to be delivered to the user equipment, where the delivery manner may be notified to the user equipment by using a system broadcast message;
  • the non-Master-BS base station in the set of base stations that construct the virtual cell needs to transmit the load information of the cell to the user equipment, where the delivery mode may be notified to the user equipment by using a system broadcast message; wherein the load information may include: the current base station Or the load status of the cell, such as high, medium, and low indications;
  • the method for the user equipment to select the signaling delivery channel includes:
  • the node with the lowest signal strength between the user and the user equipment is selected, and the node with the lowest load is received;
  • the signal strength between the user and the user equipment is selected to reach a certain threshold, and the node with the lowest load receives;
  • the signal strength between the user and the user equipment is selected to be a certain threshold, and the nodes with medium load are received;
  • the node whose signal strength between the user and the user equipment reaches a certain threshold is selected, and the node with higher load receives.
  • the signaling PDU of an RRC message needs to be completely transmitted at one node.
  • FIG. 5 is a schematic diagram 1 of a method for determining downlink signaling transmission by a network side according to an embodiment of the present invention, which specifically includes the following steps:
  • the three base stations form a virtual cell for the user 1, wherein the base station 1 is a Master-BS, and the base stations 2 and 3 are Slave-BSs, which are respectively called: Slave-BS1 and Slave-BS2. And there is an RRC message to be sent in the downlink.
  • the base station 1 is a Master-BS
  • the base stations 2 and 3 are Slave-BSs, which are respectively called: Slave-BS1 and Slave-BS2.
  • RRC message to be sent in the downlink.
  • step S501 the user equipment reports the measured signal quality of the base station or the cell in the virtual cell to the Master-BS: the signal quality of the Slave-BS1 is better than that of the Master-BS and the Slave-BS2;
  • Step S502 Slave-BS1 and Slave-BS2 transmit their own load information to the Master-BS: the load of the Slave-BS1 is smaller than that of the Slave-BS2 and the Master-BS; [Note: Step S501 and step S502 have no relationship, and At the same time, you can also exchange the order]
  • Step S503 the Master-BS determines that the Slave-BS1 is the most suitable node for transmitting the signaling PDU based on the channel quality between the node and the user equipment in the base station set constituting the virtual cell and the load condition of the node in the base station set of the virtual cell. ;
  • Step S504 the Master-BS sends the signaling PDU to the Slave-BS1;
  • Step S505 the Slave-BS1 transmits the signaling data to the user equipment through the air interface.
  • FIG. 6 is a schematic diagram 2 of a method for determining downlink signaling transmission by a network side according to an embodiment of the present invention, which specifically includes the following steps:
  • the three base stations form a virtual cell for the user 1, wherein the base station 1 is a Master-BS, and the base stations 2 and 3 are Slave-BSs, which are respectively called: Slave-BS1 and Slave-BS2.
  • Step S601 The user equipment reports the measured signal quality of the base station or the cell in the virtual cell to the Master-BS: the signal quality of the Slave-BS1 is better than that of the Master-BS and the Slave-BS2, and the signal quality of the Slave-BS2 is also good. At Threshold 2, Master-BS has the worst signal quality;
  • Step S602 Slave-BS1 and Slave-BS2 transmit their own load information to the Master-BS: the interference of the Slave-BS1 is far greater than the threshold 1, and the interference of the Slave-BS2 and the Master-BS is less than the threshold 1; [Description: Step S601 There is no relationship with step S602, which can be performed simultaneously or in the order of exchange]
  • Step S603 the Master-BS determines that the Slave-BS2 is the most suitable node for transmitting the signaling PDU based on the channel quality between the node and the user equipment in the base station set constituting the virtual cell and the load condition of the node in the base station set of the virtual cell. ;
  • Step S604 the Master-BS sends the signaling PDU to the Slave-BS2;
  • step S605 the Slave-BS2 transmits the signaling data to the user equipment through the air interface.
  • FIG. 7 is a schematic diagram 1 of a method for determining, by a user equipment, an uplink signaling transmission according to an embodiment of the present invention, which specifically includes the following steps:
  • the three base stations form a virtual cell for the user 1, wherein the base station 1 is a Master-BS, and the base stations 2 and 3 are Slave-BSs, which are respectively called: Slave-BS1 and Slave-BS2.
  • Step S701 The user equipment reads the load information and/or the channel quality threshold from the system broadcast messages of the base stations or cells constituting the virtual cell, where the Master-BS load is medium, the Slave-BS1 load is low, and the Slave-BS2 is low.
  • the load is high;
  • Step S702 The user equipment measures the signal quality of the base station or the cell in the virtual cell, where: the signal quality of the master-BS is better than that of the Slave-BS1 and the Slave-BS2; [Description: Step S701 and step S702 have no relationship, and Carry out, you can also exchange the order]
  • Step S703 the user equipment selects the Master-BS as the most suitable node for receiving the signaling PDU;
  • Step S704 the user equipment transmits the signaling data to the Master-BS through the air interface.
  • FIG. 8 is a schematic diagram 2 of a method for a user equipment to determine uplink signaling transmission according to an embodiment of the present invention, which specifically includes the following steps:
  • the three base stations form a virtual cell for the user 1, wherein the base station 1 is a Master-BS, and the base stations 2 and 3 are Slave-BSs, which are respectively called: Slave-BS1 and Slave-BS2.
  • Step S801 the user equipment reads the load information and/or the channel quality threshold from the system broadcast messages of the base stations or cells constituting the virtual cell, where the Slave-BS1 load is low, the Master-BS load is high, and the Slave-BS2 is The load is high;
  • Step S802 the user equipment measures the signal quality of the base station or the cell in the virtual cell, wherein: the signal quality of the Slave-BS1 is not the best compared to the Master-BS and the Slave-BS2, but the signal quality thereof also satisfies the predetermined Channel quality threshold; [Description: Step S801 and step S802 have no relationship, which can be performed simultaneously or in the order of exchange]
  • Step S803 the user equipment selects Slave-BS1 as the most suitable node for receiving the signaling PDU;
  • Step S804 the user equipment transmits the signaling data to the Slave-BS1 through the air interface.
  • the method for selecting a signaling channel for a virtual cell enables the signaling of the control plane to be transmitted and received under the most suitable node in the set of base stations in the virtual cell.
  • the signaling of the control plane can also be reliably received by the base station where the primary serving base station is not the best channel quality of the user.
  • the invention avoids frequent replacement of the Master-BS, reduces control plane signaling data synchronization and service data synchronization between the source Master-BS and the target Master-BS caused by frequent Master-BS changes, and reduces the relationship between the base stations. Backhaul's transmission overhead.
  • an embodiment of the present invention also provides a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • channel quality information is channel quality information between the primary base station and one or more secondary base stations and user equipment, and one or more secondary base stations are secondary base stations corresponding to the primary base station;
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the various modules or steps of the present invention described above can be used with general calculations.
  • the devices are implemented, they may be centralized on a single computing device, or distributed over a network of multiple computing devices, optionally they may be implemented in program code executable by the computing device, such that they may be stored Executed by the computing device in a storage device, and in some cases, the steps shown or described may be performed in an order different than that herein, or separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the network quality information is obtained by using the network element, where the channel quality information is the channel quality information between the primary base station and one or more secondary base stations and the user equipment, and the one or more secondary base stations are corresponding to the primary base station.
  • a secondary base station the network element acquires load information of the primary base station and the one or more secondary base stations; the network element selects a designated base station from the primary base station and one or more secondary base stations according to channel quality information and load information, where the designated base station is A base station that performs control signaling transmission with the user equipment.

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Abstract

本发明提供了一种基站选择方法及装置，其中，该方法包括：网元获取信道质量信息（S302），其中，信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，一个或者多个辅基站是与主基站对应的辅基站；网元获取主基站和该一个或者多个辅基站的负载信息（S304）；网元根据信道质量信息和负载信息从主基站和一个或者多个辅基站中选择指定基站（S306），其中，指定基站为与用户设备进行控制信令传输的基站。通过本发明解决了相关技术虚拟小区中如何保证控制面信令能够可靠地被接收端所接收的问题，避免了频繁更换主基站导致的问题，减小了基站之间的回程传输开销。

Description

基站选择方法及装置 技术领域
本发明涉及通信领域，具体而言，涉及一种基站选择方法及装置。
背景技术
随着无线通信的用户群体越来越多，使得其应用场景变得越来越广泛，移动互联网、物联网、以及其他业务应用的迅猛发展已经成为推动第五代移动通信技术(5G)发展的主要驱动力。因此高速数据业务以及无处不在接入的需求正呈现出一种爆炸式的增长。根据预测到2020年，业务量将为目前业务量的1000倍，基于此，需要提升宽带无线接入网的能力，适应未来用户业务需求。
针对宽带无线接入的需求，目前欧盟、中国、日本、美国等均启动了第五代移动通信系统的需求与关键技术研究。提升网络吞吐量的主要手段包括，提升点到点链路的传输速率，扩展频谱资源，高密度部署的异构网络；其中高密度部署的异构网络将支撑目前业务量的20至30倍，在高密度部署的网络环境(Utra Dense Network，简称为UDN)中，通过缩小小区的覆盖面积，提升频谱资源的空间复用率，但是UDN小站虽然能够提供好的链路质量，但由于小站的覆盖很小，无法很好的支持用户的快速移动，因此现在也提出了新的解决技术，比如引入虚拟小区的概念，也即以用户为中心，为用户动态构建虚拟小区，如图1所示，虚拟小区由3个基站(Base Station，简称为BS)构成，一个用户设备(Use Equipment，简称为UE)和这3个基站都存在连接，其中：一个为主服务基站(Master-BS)，另外2个为从服务基站(Slave-BS)；以解决移动过程中用户因为服务基站的改变而引起业务频繁终端，影响用户体验的问题。
从图1可看出，已有的技术控制面信令还是在主服务基站(Master-BS)发送给用户，也即网络侧只需要选择主服务基站进行控制面信令的传递就可以。但由于主服务基站也是一个小小区，那么为了使得控制面的信令能够更加可靠地被用户所接收，通常需要频繁的更换Master-BS，来保证从用户的角度看到的Master-BS一直是和自己有最好的信道质量连接的BS。但这种频繁的Master-BS变更不仅会涉及到控制面信令和用户面数据的频繁同步，是不利于L2虚拟化过程。因此控制面信令也可以如图2所示的方式进行传递，也即控制面信令可以在构建成虚拟小区中的基站集合中选择一个节点进行传递，而不仅仅局限在只能是主服务基站或者主服务节点进行发送。当控制面信令可以在虚拟小区的集合中任一个节点发送时，那么就需要如何来保证控制面信令能够可靠地被接收端所接收。
针对相关技术中，虚拟小区中如何保证控制面信令能够可靠地被接收端所接收的问题，还未提出有效的解决方案。
发明内容
本发明提供了一种基站选择方法及装置，以至少解决相关技术中虚拟小区中如何保证控制面信令能够可靠地被接收端所接收的问题。
根据本发明实施例的一个方面，提供了一种基站选择方法，包括：网元获取信道质量信息，其中，上述信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，上述一个或者多个辅基站是与上述主基站对应的辅基站；上述网元获取上述主基站和上述一个或者多个辅基站的负载信息；上述网元根据上述信道质量信息和上述负载信息从上述主基站和上述一个或者多个辅基站中选择指定基站，其中，上述指定基站为与上述用户设备进行控制信令传输的基站。
可选地，上述指定基站与上述用户设备之间的信道质量大于第一阈值，并且上述指定基站的负载小于第二阈值。
可选地，上述网元获取上述信道质量信息包括：在上述网元为上述主基站的情况下，上述主基站从上述用户设备获取上述信道质量信息，或者，上述主基站从上述一个或者多个辅基站获取上述信道质量信息；或者，在上述网元为上述用户设备的情况下，上述信道质量信息由上述用户设备测量得到。
可选地，上述信道质量信息包括以下至少之一：参考信号的信号强度或者信干比、导频信号的信号强度或者信干比。
可选地，上述负载信息包括以下至少之一：上述主基站或者上述一个或者多个辅基站的已使用的资源总和、上述主基站或者上述一个或者多个辅基站的剩余可用资源总和、上述主基站或者上述一个或者多个辅基站的干扰信息。
可选地，上述网元获取上述主基站和上述一个或者多个辅基站的负载信息包括：在上述网元为上述用户设备时，上述用户设备通过系统广播消息获取上述负载信息。
根据本发明实施例的另一个方面，还提供了一种基站选择装置，该装置应用于网元，上述装置包括：第一获取模块，设置为获取信道质量信息，其中，上述信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，上述一个或者多个辅基站是与上述主基站对应的辅基站；第二获取模块，设置为获取上述主基站和上述一个或者多个辅基站的负载信息；选择模块，设置为根据上述信道质量信息和上述负载信息从上述主基站和上述一个或者多个辅基站中选择指定基站，其中，上述指定基站为与上述用户设备进行控制信令传输的基站。
可选地，上述指定基站与上述用户设备之间的信道质量大于第一阈值，并且上述指定基站的负载小于第二阈值。
可选地，上述第一获取模块还设置为，在上述网元为上述主基站的情况下，从上述用户设备获取上述信道质量信息，或者，从上述一个或者多个辅基站获取上述信道质量信息；或 者，在上述网元为上述用户设备的情况下，上述信道质量信息由上述用户设备测量得到。
可选地，上述信道质量信息包括以下至少之一：参考信号的信号强度或者信干比、导频信号的信号强度或者信干比。
可选地，上述负载信息包括以下至少之一：上述主基站或者上述一个或者多个辅基站的已使用的资源总和、上述主基站或者上述一个或者多个辅基站的剩余可用资源总和、上述主基站或者上述一个或者多个辅基站的干扰信息。
可选地，上述第二获取模块还设置为，在上述网元为上述用户设备时，通过系统广播消息获取上述负载信息。
通过本发明实施例，采用网元获取信道质量信息，其中，信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，一个或者多个辅基站是与主基站对应的辅基站；网元获取主基站和该一个或者多个辅基站的负载信息；网元根据信道质量信息和负载信息从主基站和一个或者多个辅基站中选择指定基站，其中，指定基站为与用户设备进行控制信令传输的基站。解决了相关技术中虚拟小区中如何保证控制面信令能够可靠地被接收端所接收的问题，避免了频繁更换主基站导致的问题，减小了基站之间的回程传输开销。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是超密集小区部署时的虚拟小区控制信令发送示意图；
图2是超密集小区部署时的虚拟小区控制信令多节点发送示意图；
图3是根据本发明实施例的基站选择方法的流程图；
图4是根据本发明实施例的基站选择装置的结构框图；
图5是根据本发明实施例的网络侧确定下行信令传递的方法示意图1；
图6是根据本发明实施例的网络侧确定下行信令传递的方法示意图2；
图7是根据本发明实施例的用户设备确定上行信令传递的方法示意图1；
图8是根据本发明实施例的用户设备确定上行信令传递的方法示意图2。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
在本实施例中提供了一种基站选择方法，图3是根据本发明实施例的基站选择方法的流 程图，如图3所示，该流程包括如下步骤：
步骤S302，网元获取信道质量信息，其中，信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，一个或者多个辅基站是与主基站对应的辅基站；
步骤S304，网元获取主基站和一个或者多个辅基站的负载信息；
步骤S306，网元根据信道质量信息和负载信息从主基站和一个或者多个辅基站中选择指定基站，其中，该指定基站为与用户设备进行控制信令传输的基站。
通过上述步骤，网元可以根据各个基站与用于设备之间的信道质量信息和各个基站的负载信息选择与用户设备进行控制面信令传输的指定基站，相比于相关技术中网络侧只选择主基站进行控制面信令的传递，上述步骤解决了相关技术中虚拟小区中如何保证控制面信令能够可靠地被接收端所接收的问题，避免了频繁更换主基站导致的问题，减小了基站之间的回程传输开销。
通过上述步骤选择出的指定基站，在一个可选实施例中，满足以下条件，指定基站与用户设备之间的信道质量大于第一阈值，并且指定基站的负载小于第二阈值。从而实现了从主基站和一个或者多个辅基站中选择出最合适的基站与用户设备进行控制面数据的传输。
上述步骤S302中涉及到网元获取信道质量信息，上述的网元可以是主基站或者用户设备，在一个可选实施例中，在网元为主基站的情况下，主基站从用户设备获取信道质量信息，其中信道质量信息是用户设备进行测量得到的，或者，主基站从一个或者多个辅基站获取信道质量信息，其中信道质量信息是一个或者多个辅基站进行监测得到的。在另一个可选实施例中，上述的网元为用户设备的情况下，信道质量信息由用户设备测量得到。
上述信道质量信息可以包含多种信息，下面对此进行举例说明。在一个可选实施例中，信道质量信息可以是参考信号的信号强度或者信干比，也可以是导频信号的信号强度或者信干比。
上述负载信息也可以包含多种信息，下面对此进行举例说明。在一个可选实施例中，负载信息可以是主基站或者一个或者多个辅基站的已使用的资源总和，或者可以是主基站或者一个或者多个辅基站的剩余可用资源总和，也可以是主基站或者一个或者多个辅基站的干扰信息。
在一个可选实施例中，在上述网元为用户设备时，用户设备通过系统广播消息获取上述的负载信息。
在本实施例中还提供了一种基站选择装置，该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图4是根据本发明实施例的基站选择装置的结构框图，该装置应用于网元，如图4所示， 该装置包括：第一获取模块42，设置为获取信道质量信息，其中，信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，一个或者多个辅基站是与该主基站对应的辅基站；第二获取模块44，设置为获取主基站和一个或者多个辅基站的负载信息；选择模块46，设置为根据信道质量信息和该负载信息从主基站和一个或者多个辅基站中选择指定基站，其中，指定基站为与用户设备进行控制信令传输的基站。
可选地，指定基站与用户设备之间的信道质量大于第一阈值，并且指定基站的负载小于第二阈值。
可选地，第一获取模块42还设置为，在该网元为该主基站的情况下，从用户设备获取信道质量信息，或者，从一个或者多个辅基站获取信道质量信息；或者，在网元为该用户设备的情况下，信道质量信息由该用户设备测量得到。
可选地，信道质量信息包括以下至少之一：参考信号的信号强度或者信干比、导频信号的信号强度或者信干比。
可选地，负载信息包括以下至少之一：该主基站或者该一个或者多个辅基站的已使用的资源总和、该主基站或者该一个或者多个辅基站的剩余可用资源总和、主基站或者一个或者多个辅基站的干扰信息。
可选地，第二获取模块42还设置为在该网元为用户设备时，通过系统广播消息获取该负载信息。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：第一获取模块42、第二获取模块44和选择模块46均位于同一处理器中；或者，第一获取模块42、第二获取模块44和选择模块46分别位于第一处理器、第二处理器和第三处理器中。
针对相关技术中存在的上述问题，下面结合具体的可选实施例进行说明。在下述的可选实施例中结合了上述可选实施例及其可选实施方式。
本可选实施例中提供的选择信令传递通道的方法：
一、网络侧选择下行信令传递通道的方法：
步骤一：由Master-BS基于构成虚拟小区的基站集合中的节点和用户设备之间的信道质量以及虚拟小区的基站集合中的节点的负荷情况来决定发送无线资源控制(Radio Resource Control，简称为RRC)层的信令的基站；
步骤二：当Master-BS有RRC信令消息发送时，则基于步骤Master-BS选择的基站作为发送给用户设备的通道。
可选地，构成虚拟小区的基站集合中的节点和用户设备之间的信道质量可以由用户设备测量上报，也可以由各自的基站节点来监测，并传递到Master-BS；
可选地，衡量信道质量的因素可以是参考信号的信号强度或者信干比，也可以是导频信号的信号强度或者信干比；
可选地，构建虚拟小区的基站集合中的非Master-BS基站需要传递小区的负荷信息给Master-BS，其中负荷信息可以包括但不局限：已使用的资源总和、或者剩余可用资源的总和、或者干扰大小、或者负荷状态(比如高、中、低)；
可选地，Master-BS选择信令传递通道的详细方法包括：
优先地，在构成虚拟小区集合中，选择其和用户设备之间的信号强度最好的，且干扰最小且可以有剩余资源发送信令协议数据单元(Protocol Data Unit，简称为PDU)的节点进行发送；
其次，选择其和用户设备之间的信号强度最好的，且有剩余资源可发送信令PDU，且干扰相对可接受的节点(比如干扰小于或者小于等于确定的门限1)进行发送；
再次，可在构成虚拟小区集合中，选择其和用户设备之间的信号强度可以被用户设备接收(比如信号强度大于或者大于等于确定的门限2)的，且干扰最小且可以有剩余资源发送信令数据PDU的节点进行发送；
最后，可在构成虚拟小区集合中，选择有剩余资源发送信令PDU，且其和用户设备之间的信号强度可以被用户设备接收的(比如信号强度大于或者大于等于确定的门限2)，且干扰相对可接受的节点(比如干扰小于或者小于等于确定的门限1)进行发送。
可选地，Master-BS选择信令传递通道的方法还可以为：
优先地，在构成虚拟小区集合中，选择其和用户设备之间的信号强度最好的，且负荷最低的节点进行接收；
其次，在构成虚拟小区集合中，选择其和用户设备之间的信号强度达到确定门限的，且负荷最低的节点进行接收；
再次，在构成虚拟小区集合中，选择其和用户设备之间的信号强度达到确定门限的，且负荷中等的节点进行接收；
最后，在构成虚拟小区集合中，选择其和用户设备之间的信号强度达到确定门限的，且负荷比较高的节点进行接收。
可选地，一条RRC消息的信令PDU需要在一个节点完整发送；
可选地，Master-BS的控制面需要通知用户面RRC消息需要进行传递的通道，比如目标基站标识或者小区标识。
二、用户设备选择上行信令传递通道的方法：
步骤一：由用户设备基于构成虚拟小区的基站集合中的节点和用户设备之间的信道质量 以及虚拟小区的基站集合中的节点的负荷情况来决定接收RRC层的信令的基站；
步骤二：当RRC信令消息发送时，则基于用户设备选择的基站作为接收RRC信令消息的通道。
可选地，构成虚拟小区的基站集合中的节点和用户设备之间的信道质量可以由用户设备自身测量得到，并保存最新测量结果；
可选地，衡量信道质量的因素可以是参考信号的信号强度或者信干比，也可以是导频信号的信号强度或者信干比；
可选地，用户设备用于监测信道质量状态的门限也需要传递给用户设备，其中传递方式可以是通过系统广播消息通知到到用户设备；
可选地，构建虚拟小区的基站集合中的非Master-BS基站需要传递小区的负荷信息给用户设备，其中传递方式可以是通过系统广播消息通知到到用户设备；其中负荷信息可以包括：当前基站或者小区的负荷状态，比如高、中、低指示；
可选地，用户设备选择信令传递通道的方法包括：
优先地，在构成虚拟小区集合中，选择其和用户设备之间的信号强度最好的，且负荷最低的节点进行接收；
其次，在构成虚拟小区集合中，选择其和用户设备之间的信号强度达到一定门限的，且负荷最低的节点进行接收；
再次，在构成虚拟小区集合中，选择其和用户设备之间的信号强度达到一定门限的，且负荷中等的节点进行接收；
最后，在构成虚拟小区集合中，选择其和用户设备之间的信号强度达到一定门限的，且负荷比较高的节点进行接收。
进一步地，一条RRC消息的信令PDU需要在一个节点完整发送。
下面针对本发明给出详细的虚拟小区信令传递方法的实施过程。
图5是根据本发明实施例的网络侧确定下行信令传递的方法示意图1，具体包括如下步骤：
首先：3个基站为用户1构成虚拟小区，其中基站1为Master-BS，基站2和3为Slave-BS，分别称为：Slave-BS1和Slave-BS2。且下行有RRC消息需要发送。
步骤S501，用户设备把测量得到的构成虚拟小区中的基站或小区的信号质量上报给Master-BS：Slave-BS1的信号质量好于Master-BS和Slave-BS2；
步骤S502，Slave-BS1和Slave-BS2把自身的负荷信息传递给Master-BS：Slave-BS1的负荷要小于Slave-BS2和Master-BS；【说明：步骤S501和步骤步骤S502没有先后关系，可以同时进行，也可以交换顺序】
步骤S503，Master-BS基于构成虚拟小区的基站集合中的节点和用户设备之间的信道质量以及虚拟小区的基站集合中的节点的负荷情况决定Slave-BS1是最合适的发送信令PDU的节点；
步骤S504，Master-BS把信令PDU发送给Slave-BS1；
步骤S505，Slave-BS1通过空口把信令数据传递给用户设备。
图6是根据本发明实施例的网络侧确定下行信令传递的方法示意图2，具体包括如下步骤：
首先：3个基站为用户1构成虚拟小区，其中基站1为Master-BS，基站2和3为Slave-BS，分别称为：Slave-BS1和Slave-BS2。
步骤S601，用户设备把测量得到的构成虚拟小区中的基站或小区的信号质量上报给Master-BS：Slave-BS1的信号质量好于Master-BS和Slave-BS2，Slave-BS2的信号质量也好于门限2，Master-BS的信号质量最差；
步骤S602，Slave-BS1和Slave-BS2把自身的负荷信息传递给Master-BS：Slave-BS1的干扰远大于门限1，Slave-BS2和Master-BS的干扰要小于门限1；【说明：步骤S601和步骤S602没有先后关系，可以同时进行，也可以交换顺序】
步骤S603，Master-BS基于构成虚拟小区的基站集合中的节点和用户设备之间的信道质量以及虚拟小区的基站集合中的节点的负荷情况决定Slave-BS2是最合适的发送信令PDU的节点；
步骤S604，Master-BS把信令PDU发送给Slave-BS2；
步骤S605，Slave-BS2通过空口把信令数据传递给用户设备。
图7是根据本发明实施例的用户设备确定上行信令传递的方法示意图1，具体包括如下步骤：
首先：3个基站为用户1构成虚拟小区，其中基站1为Master-BS，基站2和3为Slave-BS，分别称为：Slave-BS1和Slave-BS2。
步骤S701，用户设备从构成虚拟小区的各基站或小区的系统广播消息中读取到负荷信息和(或)信道质量门限，其中Master-BS负荷为中等，Slave-BS1负荷为低和Slave-BS2负荷为高；
步骤S702，用户设备测量构成虚拟小区中的基站或小区的信号质量，其中：Master-BS的信号质量好于Slave-BS1和Slave-BS2；【说明：步骤S701和步骤S702没有先后关系，可以同时进行，也可以交换顺序】
步骤S703，用户设备选择Master-BS作为最合适的接收信令PDU的节点；
步骤S704，用户设备通过空口把信令数据传递给Master-BS。
图8是根据本发明实施例的用户设备确定上行信令传递的方法示意图2，具体包括如下步骤：
首先：3个基站为用户1构成虚拟小区，其中基站1为Master-BS，基站2和3为Slave-BS，分别称为：Slave-BS1和Slave-BS2。
步骤S801，用户设备从构成虚拟小区的各基站或小区的系统广播消息中读取到负荷信息和(或)信道质量门限，其中Slave-BS1负荷为低，Master-BS负荷为高和Slave-BS2负荷为高；
步骤S802，用户设备测量构成虚拟小区中的基站或小区的信号质量，其中：Slave-BS1的信号质量相比Master-BS和Slave-BS2不是最好的，但是其信号质量也已满足预先确定的信道质量门限；【说明：步骤S801和步骤S802没有先后关系，可以同时进行，也可以交换顺序】
步骤S803，用户设备选择Slave-BS1作为最合适的接收信令PDU的节点；
步骤S804，用户设备通过空口把信令数据传递给Slave-BS1。
综上所述，通过本发明提供的一种虚拟小区选择信令传递通道的方法，可以使得控制面的信令可以在虚拟小区中的基站集合中的最适合发送的节点下进行发送和接收，使得在主服务基站不是用户的最好信道质量的基站，控制面的信令也能够被可靠接收。采用本发明避免了频繁更换Master-BS，减少了频繁Master-BS变更导致的源Master-BS和目标Master-BS之间的控制面信令数据同步和业务数据同步，减小了基站之间的backhaul的传输开销。
在另外一个实施例中，还提供了一种软件，该软件用于执行上述实施例及优选实施方式中描述的技术方案。
在另外一个实施例中，本发明的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，获取信道质量信息，其中，信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，一个或者多个辅基站是与主基站对应的辅基站；
S2，获取主基站和一个或者多个辅基站的负载信息；
S3，根据信道质量信息和负载信息从主基站和一个或者多个辅基站中选择指定基站，其中，指定基站为与用户设备进行控制信令传输的基站。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算 装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
通过本发明实施例，采用网元获取信道质量信息，其中，信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，一个或者多个辅基站是与主基站对应的辅基站；网元获取主基站和该一个或者多个辅基站的负载信息；网元根据信道质量信息和负载信息从主基站和一个或者多个辅基站中选择指定基站，其中，指定基站为与用户设备进行控制信令传输的基站。解决了相关技术中虚拟小区中如何保证控制面信令能够可靠地被接收端所接收的问题，避免了频繁更换主基站导致的问题，减小了基站之间的回程传输开销。

Claims (12)

  1. 一种基站选择方法，包括：
    网元获取信道质量信息，其中，所述信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，所述一个或者多个辅基站是与所述主基站对应的辅基站；
    所述网元获取所述主基站和所述一个或者多个辅基站的负载信息；
    所述网元根据所述信道质量信息和所述负载信息从所述主基站和所述一个或者多个辅基站中选择指定基站，其中，所述指定基站为与所述用户设备进行控制信令传输的基站。
  2. 根据权利要求1所述的方法，其中，所述指定基站与所述用户设备之间的信道质量大于第一阈值，并且所述指定基站的负载小于第二阈值。
  3. 根据权利要求1所述的方法，其中，所述网元获取所述信道质量信息包括：
    在所述网元为所述主基站的情况下，所述主基站从所述用户设备获取所述信道质量信息，或者，所述主基站从所述一个或者多个辅基站获取所述信道质量信息；或者，
    在所述网元为所述用户设备的情况下，所述信道质量信息由所述用户设备测量得到。
  4. 根据权利要求1至3中任一项所述的方法，其中，所述信道质量信息包括以下至少之一：
    参考信号的信号强度或者信干比、导频信号的信号强度或者信干比。
  5. 根据权利要求1至3中任一项所述的方法，其中，所述负载信息包括以下至少之一：
    所述主基站或者所述一个或者多个辅基站的已使用的资源总和、所述主基站或者所述一个或者多个辅基站的剩余可用资源总和、所述主基站或者所述一个或者多个辅基站的干扰信息。
  6. 根据权利要求1所述的方法，其中，所述网元获取所述主基站和所述一个或者多个辅基站的负载信息包括：
    在所述网元为所述用户设备时，所述用户设备通过系统广播消息获取所述负载信息。
  7. 一种基站选择装置，该装置应用于网元，所述装置包括：
    第一获取模块，设置为获取信道质量信息，其中，所述信道质量信息为主基站以及一个或者多个辅基站与用户设备之间的信道质量信息，所述一个或者多个辅基站是与所述主基站对应的辅基站；
    第二获取模块，设置为获取所述主基站和所述一个或者多个辅基站的负载信息；
    选择模块，设置为根据所述信道质量信息和所述负载信息从所述主基站和所述一个或者多个辅基站中选择指定基站，其中，所述指定基站为与所述用户设备进行控制信令 传输的基站。
  8. 根据权利要求7所述的装置，其中，所述指定基站与所述用户设备之间的信道质量大于第一阈值，并且所述指定基站的负载小于第二阈值。
  9. 根据权利要求7所述的装置，其中，所述第一获取模块还设置为，在所述网元为所述主基站的情况下，从所述用户设备获取所述信道质量信息，或者，从所述一个或者多个辅基站获取所述信道质量信息；或者，在所述网元为所述用户设备的情况下，所述信道质量信息由所述用户设备测量得到。
  10. 根据权利要求7至9中任一项所述的装置，其中，所述信道质量信息包括以下至少之一：
    参考信号的信号强度或者信干比、导频信号的信号强度或者信干比。
  11. 根据权利要求7至9中任一项所述的装置，其中，所述负载信息包括以下至少之一：
    所述主基站或者所述一个或者多个辅基站的已使用的资源总和、所述主基站或者所述一个或者多个辅基站的剩余可用资源总和、所述主基站或者所述一个或者多个辅基站的干扰信息。
  12. 根据权利要求7所述的装置，其中，所述第二获取模块还设置为，在所述网元为所述用户设备时，通过系统广播消息获取所述负载信息。
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