CN101938783B - Method and system for realizing load balance - Google Patents

Abstract

The present invention discloses a method for achieving load balancing, comprising: a picocell base station, upon receiving an instruction from an instruction-sending device, converting its own type from a first type to a second type; further, a mobile station can access the converted picocell base station or its adjacent cell. The present invention also discloses another method for achieving load balancing and a system for achieving load balancing. The present invention can solve the load balancing problem of picocells in different scenarios, thereby improving system stability and service quality.

Description

A method and system for realizing load balancing

technical field

The present invention relates to load balancing technology, in particular to a method and system for realizing load balancing between a picocell base station and other base stations in a wireless communication network.

Background technique

Generally, a wireless communication system uses electromagnetic waves to communicate with a fixed or mobile wireless communication terminal, wherein the wireless communication terminal may be a mobile wireless phone, or a notebook computer with a wireless communication card attached, and may be referred to simply as a terminal. Generally speaking, the terminals are located within the wireless coverage area of the system, and the electromagnetic wave frequencies assigned to these terminals are divided into multiple carrier frequencies as wireless communication channels, and the wireless communication system uses the designated wireless communication channels through the base station to provide For wireless coverage, this geographical area is called a cell. Theoretically, the base station should generally be located in the center of the cell.

Since the development of wireless communication networks, in addition to public network macrocells that provide services to the public, femtocells have also emerged. Different femtocells, such as home-wide, office-wide or campus-wide networks, have their own application scenarios. . The purpose of the pico cell is to make up for the weakness of the public network base station, that is, the insufficient indoor coverage of the macro base station (Macro BS), and provide mobile users with ubiquitous high-quality wireless access. Users can purchase or install femtocell base stations (Femtocell BS) by themselves. Generally, the coverage area radius of femtocell base stations is about tens of meters. As shown in Figure 1, the dotted circle constitutes the macro cell covered by the macro base station, and the dotted hexagon constitutes the pico cell covered by the pico cell base station. A network, such as a cable, a digital subscriber line (DSL, Digital Subscriber Line), or Ethernet, is used as a backhaul (backhaul) to access the network, wherein the network includes an access service network and/or a connection service network.

In addition, as shown in Figure 2, the pico cell base station user groups can be divided into open subscriber group (OSG, open subscriber group) and closed subscriber group (CSG, closed subscriber group), wherein, the pico cell base station of the open subscriber group can access the service Any mobile terminal in the area; and for the pico cell base station of the closed user group, unless it is an emergency, generally only the terminal that has subscribed to the service can be accessed, that is, the member belonging to the closed user group, such as the user terminal installed with a private base station Or other terminals approved by the user, non-closed user group members generally cannot enjoy the service of the cell. Furthermore, closed subscriber groups can also be divided into partial closed subscriber groups (CSG-Open) and complete closed subscriber groups (CSG-Closed). Specifically, in addition to providing In addition to services, it can also provide low-priority services for non-closed user group users, but the premise is that the quality of service of closed user group users cannot be affected; and the picocell base station of a complete closed user group can only serve the users of this closed user group Provide services.

In the prior art, when many users access a certain macro base station at the same time, such as a macro base station in a hotspot area, the macro base station may be congested due to heavy load, resulting in low service quality. At this time, the pico cell base station under the macro base station needs to assist in bearing the load. It would be more efficient if the base station of the complete closed subscriber group can be converted to the base station of the partial closed subscriber group to bear the load. Or, the pico cell of OSG and/or CSG-Open may also be overloaded when the load of the macro base station is too heavy. Therefore, the pico cell of CSG needs to change the work type to assist the pico cell of OSG and/or CSG-Open Load balancing.

In addition, if a pico-cell base station of a CSG can be converted to a pico-cell base station of a partial CSG, then it needs to be converted back when the load of the adjacent macro base station is normal, but at this time, if multiple CSG If the pico cell base stations are switched back at the same time, a large number of terminals will be switched to the macro base station at the same time, which will also cause system instability and service quality degradation.

How to coordinate the load balancing problem under various load conditions has not yet proposed a suitable solution. In addition, load balancing coordination is often related to disturbance control. Therefore, solving the related problems of load balancing can further solve the control problem of disturbance response.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method and system for implementing load balancing, which can solve the load balancing problem of pico cells in different scenarios, and improve system stability and service quality.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a method for realizing load balance, which includes: the base station of a pico cell receives an instruction indicating a sending device, and converts its own type from the first type to the second type.

In the above solution, after the type conversion of the pico cell base station, the method further includes: the mobile station accessing the converted pico cell base station, or the mobile station accessing a neighboring base station of the converted pico cell base station.

In the above scheme, the access of the mobile station to the converted pico cell base station is: the mobile station switches to the converted pico cell base station; and/or the mobile station initially accesses the converted pico cell base station .

In the above solution, after the picocell base station switches the type, the method further includes: sending feedback information to the instruction sending device.

In the above solution, after the indication sending device receives the feedback information, the method further includes: notifying the network or other base stations of the feedback information.

In the above solution, before the pico cell base station receives the indication, the method further includes: the pico cell base station sends its own working status information to the indication sending device.

Wherein, the picocell base station sends its own working status information to the network, and the method further includes: the network notifies other base stations of the received working status information. The pico cell base station sending the working status information is: the pico cell base station sends actively; or sends the working status information in response to an instruction sending device.

In the above solution, the first type is a pico cell base station of a completely closed subscriber group, and the second type is a pico cell base station of a partial closed subscriber group; or the first type is a pico cell base station of a partial closed subscriber group, and the second type is a pico cell base station of a partial closed subscriber group. A picocell base station of the type Full Closed Subscriber Group. The conversion is to change the type identifier described in the picocell base station physical layer and/or medium access control layer signal.

The indication sending device is a macro base station, or an Open Subscriber Group pico cell base station, or a network. The instruction sending device is a macro base station or an Open Subscriber Group pico cell base station, and the instruction is sent by the base station on the air interface; and/or the instruction sending device is a network, and the instruction is sent on the backhaul network through the network. The indication is sent through the air interface in one or a combination of the following ways: broadcast, multicast, and unicast. The indication is carried in downlink control information. The indication is carried in the control information of the physical layer; and/or carried in the management message of the media access control layer.

The method further includes: the system allocates specific resources for message interaction between base stations; the specific resources are time resources, and/or frequency resources, and/or connection identification resources.

In the above solution, the feedback information includes information about whether the conversion is successful, and/or resource information of the pico cell base station, and/or load information of the pico cell; the resource information is already used resource information, and/or idle resource information .

The present invention also provides a load balancing method, including: the base station of the pico cell receives an instruction indicating the sending device, and adds the mobile station to be handed over to the category of mobile stations that can be accessed; the mobile station accesses the pico cell cell base station.

In the above solution, before the mobile station accesses the picocell base station, the method further includes: notifying the target picocell base station to the mobile station to be handed over, and the mobile station is handed over to the target picocell base station.

In the above solution, adding the mobile station to be handed over to the accessible mobile station category includes: adding the mobile station to a closed subscriber group, and/or setting a corresponding service level.

The present invention further provides a system for implementing load balancing, including an indication sending device, a picocell base station, and a mobile station; wherein,

The instruction sending device is used to indicate the switching type of the pico cell base station, or notify the pico cell base station of the mobile station information to be handed over;

The pico cell base station is used to receive the instruction and switch its own type, or add the mobile station to be handed over to the accessible mobile station category;

The mobile station is used for accessing the converted pico cell base station or its neighboring base stations, or switching the pico cell base station.

In the above solution, the pico cell base station is also used to feed back information to the instruction sending device; and is also used to instruct a subordinate UCG mobile station to switch to the macro base station.

In the method and system for implementing load balancing provided by the present invention, the picocell base station receives instructions from other base stations or networks, converts its own type from the first type to the second type, or switches the picocell base station to which the mobile station belongs, so that the CSG- Closed is converted to CSG-Open, or CSG-open is converted to CSG-closed, so that the pico cell base station can achieve load balancing in a variety of different scenarios, thereby improving system stability and service quality, such as the original large number of adjacent cell interference can be suppressed.

In specific implementation, the indication can be sent by other base stations and/or networks; other base stations can be macro base stations, or open user group pico cell base stations; other base stations or networks can also send the working status information of other base stations to pico cells For the base station, the working information may be carried through a medium access layer (MAC) message, or may be carried through physical layer control information. In a word, the implementation manner is flexible, diverse and easy to implement.

Description of drawings

Fig. 1 is a schematic diagram of network topology;

FIG. 2 is a schematic diagram of different types of user groups under a pico cell base station;

FIG. 3 is a schematic diagram of the operating state of a picocell base station;

Fig. 4 to Fig. 43 are schematic diagrams of the implementation flow of Embodiment 1 to Embodiment 40 of the present invention;

FIG. 44 to FIG. 46 are schematic diagrams of the realization flow of Embodiment 41 to Embodiment 43 of the present invention.

Detailed ways

The basic idea of the present invention is: the picocell base station receives instructions from other base stations and/or networks, converts its own type from the first type to the second type, or switches the picocell base station to which the mobile station belongs, so as to realize the load of the picocell base station. balanced.

Here, the first type is a pico-cell base station of a fully closed subscriber group, and the second type is a pico-cell base station of a partial closed subscriber group. Picocell base stations for closed subscriber groups. Or, the first type is a pico cell base station of a partial closed subscriber group, and the second type is a pico cell base station of a complete closed subscriber group, then the type conversion of the pico cell base station is: from a partial closed subscriber group pico cell base station to a complete Picocell base stations for closed subscriber groups. Alternatively, a fully closed subscriber group picocell base station allows mobile stations requiring handover to join the fully closed subscriber group.

For the above conversion scheme, the indication may be sent by other base stations and/or the network; the other base stations may be macro base stations or OSG pico cell base stations. Here, other base stations or networks may be collectively referred to as an indication sending device.

Further, the picocell base station can send its own working status information to other base stations or networks, directly to other base stations, to the network, or to other base stations via the network; other base stations or networks can also send other base stations The working status is sent to the pico cell base station. The working information of the picocell base station may be carried by a medium access layer (MAC) message, or by physical layer control information.

Further, the type conversion may be implemented by changing the type identifier described by the picocell base station physical layer signal and/or MAC layer signal. Wherein, the physical layer signal includes a synchronization sequence (sequence), the synchronization sequence may be included in a preamble (Preamble), and the preamble may be a secondary preamble (Secondary Preamble) or a primary preamble (Primary Preamble).

Here, when the type conversion is by changing the physical layer signal of the pico cell base station, the pico cell base station needs to notify the subordinate mobile station that the type conversion is about to take place in advance, and after receiving the notification, the subordinate mobile station, according to the notification information resynchronizing with the picocell base station after the type switch has occurred. The notification information includes a combination of one or more of the following parameters: type conversion indication, time parameter for type conversion; the notification may be a combination of one or more of the following methods: multicast, broadcast, unicast . The mobile station may or may not give feedback after receiving the notification.

The picocell base station can send the feedback information converted by itself to other base stations or the network, directly to other base stations, or directly to the network; when sending to the network, the network can choose to notify other base stations of the feedback information, or not notify other base stations . Wherein, the feedback information includes conversion success information, and/or resource information.

World Interoperability for Microwave Access (WiMAX, World Interoperability for Microwave Access) is a broadband wireless access Metropolitan Area Network technology (Broadband Wireless Access Metropolitan Area Network) based on the IEEE802.16 standard. The basic goal of WiMAX is to access Under the environment, to ensure the interconnection of wireless devices from different manufacturers, it is mainly used to provide the last mile high-speed broadband access for families, enterprises and mobile communication networks, as well as future personal mobile communication services. The IEEE802.16 standard formulates the specifications of the physical layer (PHY) and the MAC layer, and is a new air interface standard proposed for the microwave frequency band. Among them, IEEE802.16m including relay structure is the latest standard technology at present, and IEEE802.16m is established on the basis of two standards of IEEE802.16e and IEEE802.16j.

The present invention is implemented in the IEEE802.16m system, and when the pico cell base station of the IEEE802.16m system is in the active mode (active mode), as shown in Figure 2, the work type can be switched between a partial CSG and a complete CSG; As shown in Figure 3, both the active mode and the power saving mode are operable. The active mode includes CSG and OSG, and the CSG is divided into partial closed subscriber group and full closed subscriber group; the power saving mode includes available interval (Available Interval ) and UnavailableInterval.

Based on the above application environment and basic ideas, the present invention mainly involves five typical implementation solutions, which will be described in detail below.

In the first implementation scheme, the picocell base station is converted from CSG-closed to CSG-Open according to the instructions. In this scheme, load balancing includes the following steps:

Step 11: Other base stations and/or networks instruct the pico cell base station of the complete CSG to convert to the pico cell base station of the partial CSG;

Here, the indication is sent on the air interface by other base stations and/or sent on the backhaul network through the network; the indication is carried in the downlink control information, specifically, the indication is carried in the control information of the physical layer; and/or carried In the management message of the MAC layer.

It should be noted that: in general, there is only one controller, that is, other base stations or networks; but in special cases, there may be two controllers at the same time, that is, other base stations and networks. For this special case, if the mobile station receives Two identical indications, the second identical indication can be ignored.

The transmission mode of the other base stations on the air interface is one or a combination of the following modes: broadcast, multicast, and unicast. Preferably, when the load of other base stations is already too heavy, the sending method adopts broadcast; when the load of other base stations is about to be too heavy, the sending method adopts multicast or unicast.

When the transmission mode is broadcast, the indication may be included in the physical layer control information. For example, the indication may be the cell bar in the 802.16m system superframe header (SFH), or a specific sequence.

When the message is unicast or multicast, before receiving the message, other base stations can send system information that the load is about to be too heavy, and after receiving the system information, subordinate terminals of other base stations can report the closed user group information obtained by scanning. After receiving the scanning report of the terminal, the other base stations send the message to the pico cell base station by unicast or multicast. Here, the scanning may be triggered by the system information, that is, the system information includes an instruction to scan closed subscriber group pico cell base stations, and the terminal scans or blind scans according to the instruction after receiving the system information; The scanning may also be performed by the terminal according to other broadcast information of the macro base station.

The transmission mode is a combination of one or more of the following modes: broadcast, multicast, and unicast, the indication may be a management message of the medium access control (MAC) layer, and the message may be a message containing the indication Broadcast, multicast or unicast messages of information. At this time, the system should allocate specific resources for the message interaction between other base stations and the pico cell base station, such as: time resources, and/or frequency resources, and/or connection identification resources; the pico cell base station distinguishes whether the message should be demodulated through specific resources . For example, if the message is a broadcast message, the system allocates a specific time-frequency resource and a broadcast connection identifier to the message, and all pico cells receive the message using the broadcast connection identifier on the time-frequency resource, they should demodulation. For another example, if the message is a unicast message, and the system allocates a specific time-frequency resource and a unicast connection identifier to the message, only the picocell base station using the unicast connection identifier should receive it on the specific time-frequency resource and Demodulate the message.

When the indication is broadcast or multicast, the closed subscriber group pico cell base station that receives the indication may send an operation type conversion request to other base stations or networks, and other base stations or networks that receive the request message send an operation type conversion request. Feedback is requested to confirm that the picocell base station can switch the working type or cannot switch the working type.

Step 12: After receiving the instruction, the pico-cell base station of the complete CSG converts itself into a pico-cell base station of the partial CSG.

Here, after the pico cell base station of the complete CSG is converted into the pico cell base station of the partial CSG, the feedback notification is sent to other base stations and/or the network. The picocell base station notifies other base stations by feeding back through an air interface, and the notification may be physical layer information, or may be a MAC layer message including the feedback. When the feedback is a MAC layer message, the system may allocate specific resources to the messages of other base stations and pico cell base stations, and the specific resources are: time resources, and/or frequency resources, and/or connection identification resources.

The picocell base station feeds back to the network through the backhaul network, and the network may notify the other base stations of the feedback through the backhaul network. The feedback includes at least one of the following information: information about whether the pico cell base station has completed switching; resource information of the pico cell base station; load information of the pico cell. Wherein, the resource information includes one of the following information: used resource information and idle resource information.

The converting is: changing the type identifier described in the picocell base station physical layer and/or MAC layer signal; this converting action may be the same action as the broadcast sending.

Other base stations may instruct subordinate mobile stations to access the partial CSG pico cell base stations according to the feedback information; other base stations may also directly instruct subordinate mobile stations to access the partial CSG without the feedback information. Picocell base stations for closed subscriber groups. Wherein, the access may be handover/re-entry of the mobile station, or initial access of the mobile station. The access can be accomplished using the existing technology, wherein the handover can be initiated by the subordinate mobile station or by other base stations, and the handover guidance of other base stations includes recommending the picocell base station as the target base station for scanning and/or handover.

The partial CSG pico cell base stations receive network re-entry switched by users not in the CSG, and the users may come from macro base stations or from open user group pico cell base stations.

In the second implementation scheme, the pico cell base station is converted from CSG-closed to CSG-Open according to the instructions, and the pico cell base station sends its own working status to other base stations and/or networks. In this scheme, implementing load balancing includes the following steps:

Step 21: The base station of the pico cell of the completely closed subscriber group sends the working status information to other base stations and/or the network.

Wherein, the working status information includes at least one of the following information: resource information of the pico cell base station, load information of the pico cell, information on whether the pico cell can access new terminals; the resource information Including one of the following information: used resource information, free resource information.

The working status information is actively sent by the pico cell base station; or, the working status information is sent by the pico cell base station in response to other base station working status information sent by other base stations and/or networks. The working status information sent by the other base stations and/or the network includes at least one of the following information: the load of other base stations is too heavy, the load of other base stations is about to be too heavy, the load of the pico cells of the open user group is too heavy, the load of the pico cells of the open user group is about to too heavy.

The working state information sent by other base stations may be included in the physical layer control information, or included in the MAC layer message. An embodiment in which the overloaded information is included in the physical layer control information physical layer control information is that the cell bar setting in the super frame header (SFH) in the 802.16m system prohibits other users from accessing the cell; When the load-related information is included in the MAC layer message, the system should allocate specific resources, such as time resources, and/or frequency resources, and/or connection identification resources, for message interactions between other base stations and picocell base stations. The picocell base station judges whether the message should be demodulated through specific resources, and the sending mode of the MAC message including the load related information may be broadcast, multicast, or unicast.

The network sends the working status information of the other base stations through the backhaul network.

The picocell base station sends its own working status information to the other base stations through the air interface, and the information may be included in physical layer control information, or in a MAC layer message.

The pico cell base station notifies the network through a backhaul network feedback, and the network notifies the other base stations of the feedback through the backhaul network.

Step 22: According to the working state information, other base stations and/or networks instruct the pico-cell base stations of the complete CSG to switch to the pico-cell base stations of the partial CSG.

Here, the indication sent by other base stations through the air interface may be included in downlink control information, specifically, it may be included in physical layer control information, and may also be included in a MAC layer message. When the indication is broadcast, the pico cell with heavy load and/or resource shortage may ignore this indication. When the indication is unicast or multicast, the pico cells receiving unicast or multicast should be selected according to the feedback information, that is, pico cells with light load and/or sufficient resources should be selected preferentially.

The network sends the indication through the backhaul network, and pico cells with light load and/or sufficient resources should be preferentially selected to receive the indication.

When the indication is broadcast or multicast, the closed subscriber group pico cell base station that receives the indication may send an operation type conversion request to other base stations or networks, and other base stations or networks that receive the request message send an operation type conversion request. Feedback is requested to confirm that the picocell base station can switch the working type or cannot switch the working type.

Step 23: After receiving the instruction, the partial CSG pico cell base station switches to a complete CSG pico cell base station.

Here, the definition and description of the indication, feedback information, and conversion are exactly the same as those in step 12, and will not be repeated here.

In the third implementation scheme, the pico cell base station is converted from CSG-Open to CSG-closed according to the instructions. In this scheme, the load balancing includes the following steps:

Step 31: The other base station or the network instructs the partial CSG pico cell base station to convert to the complete CSG pico cell base station.

Wherein, the indication is sent by other base stations on the air interface and/or by the network on the backhaul network. The transmission mode of the other base stations on the air interface is multicast or unicast, and cannot be broadcast.

The indication is carried in the downlink control information, specifically, it may be carried in the control information of the physical layer; it may also be carried in the management message of the MAC layer, and the message may be a multicast or unicast message containing the indication information . At this time, the system should allocate specific resources, such as time resources, and/or frequency resources, and/or connection identification resources, for message interaction between other base stations and picocell base stations. The picocell base station distinguishes whether the message should be demodulated by means of specific resources. For example: if the message is a unicast message, and the system allocates a specific time-frequency resource and unicast connection ID to the message, only the picocell base station using the unicast connection ID should receive and demodulate on the specified time-frequency resource the message.

Step 32: After receiving the instruction, the partial CSG pico cell base station switches to a complete CSG pico cell base station.

This step further includes: the picocell base station instructs subordinate terminals not in the CSG to switch to other base stations, and the switching can be completed using existing technologies, wherein the switching can be initiated by subordinate terminals or private base stations.

Here, the pico-cell base station of the complete CSG is converted into the pico-cell base station of the partial CSG, and the conversion occurs after all subordinate terminals not in the CSG are handed over to other base stations. The conversion includes: changing the type identifier described by the picocell base station physical layer and/or MAC layer signal.

The pico cell base station of the CSG sends feedback to notify other base stations and/or the network. The picocell base station notifies other base stations through an air interface feedback. The notification may be physical layer information or a MAC layer message containing the feedback. This feedback step may be implemented in the same action as the conversion.

When the feedback is a MAC layer message, the system may allocate specific resources, such as time resources, and/or frequency resources, and/or connection identification resources, to messages of other base stations and picocell base stations.

The pico cell base station notifies the network through a backhaul network feedback, and the network notifies the other base stations of the feedback through the backhaul network. The feedback includes at least one of the following information: information on whether the pico cell base station has completed switching (for example, an identification of an operation type), resource information of the pico cell base station, and load information of the pico cell. The resource information includes one of the following information, used resource information and free resource information.

The fourth implementation scheme, the pico cell base station is converted from CSG-Open to CSG-closed according to the instruction, and the pico cell base station sends its own working status to other base stations and/or networks. In this scheme, load balancing includes the following steps:

Step 41: The base station of the pico cell of the completely closed subscriber group sends the working status information to other base stations and/or the network.

Wherein, the working state information includes at least one of the following information: resource information of the pico cell base station, load information of the pico cell, and information about whether the pico cell can access a new terminal. The resource information includes one of the following information: used resource information and idle resource information.

The working status information is actively sent by the pico cell base station; or, the working status information is sent by the pico cell base station in response to other base station working status information sent by other base stations and/or networks. The working status information sent by the other base stations and/or the network includes at least one of the following information: the load of other base stations is normal, and the other base stations can be accessed normally.

The working state information sent by other base stations may be included in the physical layer control information, or included in the MAC layer message. An embodiment of the overloaded information included in the physical layer control information is that the cell bar setting in the superframe header (SFH) in the 802.16m system allows other users to access the cell. When the physical layer control information is included in the MAC layer message, the system should allocate specific resources for the message interaction between other base stations and pico cell base stations, such as: time resources, and/or frequency resources, and/or connection identification resources; pico cell The base station distinguishes whether the message should be demodulated by means of specific resources. The sending manner of the MAC message containing the information may be broadcast, multicast or unicast.

The network sends the working status information of the other base stations through the backhaul network.

The picocell base station sends its working status information to the other base stations through the air interface, and the information may be included in physical layer control information or in MAC layer messages. The pico cell base station notifies the network through a backhaul network feedback, and the network notifies the other base stations of the feedback through the backhaul network.

In step 42, other base stations and/or networks instruct the pico-cell base stations of the complete CSG to switch to the pico-cell base stations of the partial CSG according to the working state information.

Here, the indication sent by other base stations through the air interface may be included in downlink control information, specifically, it may be included in physical layer control information, and may also be included in a MAC layer message. When the indication is broadcast, the pico cells with normal load and/or sufficient resources can ignore this indication; when the indication is unicast or multicast, the pico cells receiving unicast or multicast should choose priority according to the feedback information. Classes, that is, pico cells that are heavily loaded and/or resource-poor can be preferentially selected.

The network sends the indication through the backhaul network. Only pico cells with heavy load and/or resource shortage can be preferentially selected to receive this indication.

Step 43: After receiving the instruction, the partial CSG pico cell base station switches to a complete CSG pico cell base station.

Here, the definition and description of the indication, feedback information, and conversion are exactly the same as those in step 32, and will not be repeated here.

In the fifth implementation scheme, OSG and CSG do not need to be switched, and the mobile station that needs to be handed over is controlled by the picocell base station of the fully closed subscriber group to join the fully closed subscriber group. The load balancing in this scheme includes the following steps:

Step 51: Other base stations and/or networks send instructions to the picocell base station, and send the information of the mobile station to be handed over to the picocell base station of the complete closed subscriber group.

Step 52: The picocell base station of the fully closed subscriber group adds the mobile station information to the category of mobile stations that can be accessed, and feeds back the information to other base stations and/or networks. For example, adding the mobile station to a closed subscriber group, and/or setting a corresponding service level.

Further, the feedback information includes whether the mobile station is allowed to access and/or resource information of the picocell base station, where the resource information is used resource information and/or idle resource information.

Step 53: Other base stations and/or networks send the corresponding target picocell base station information to the mobile station according to the feedback; for example, the mobile station may add the target picocell base station to its list of accessible base stations.

Step 54: The mobile station accesses the target picocell base station.

Here, the accessing is handing over the mobile station to the target picocell base station.

The implementation of the method of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Here, in Embodiments 1 to 20, the macro base station or the network is used as the controller. At this time, the corresponding scenario is that the macro base station is overloaded, including already overloaded or about to be overloaded, and then the closed subscriber group pico cells are used for load balancing. Wherein, Embodiments 1 to 10 do not use the uplink air interface from the pico cell base station to the macro base station, and embodiments 11 to 20 use the uplink air interface from the pico cell base station to the macro base station.

Embodiment one:

In this embodiment, the pico cell base station of the complete closed subscriber group is converted into the pico cell base station of the partial closed subscriber group; the macro base station indicates; the feedback information is sent to the network.

As shown in Figure 4, implementing load balancing in this embodiment includes the following steps:

Step 4a: the macro base station instructs the pico cell base station of the complete closed subscriber group to convert to the pico cell base station of the partial closed subscriber group;

Further, the instruction is sent by the macro base station over the air interface. When the load of the macro base station is already heavy, the sending method is broadcast; when the load of the macro base station is about to be too heavy, the sending method is multicast or unicast.

When the transmission mode is broadcast, the indication can be included in the physical layer control information. One embodiment is that this indication can be the cell bar in the super frame header (SFH) in the 802.16m system, and another embodiment is synchronization specific sequence in the channel.

When the message is unicast or multicast, before receiving the message, the macro base station can send the system information that the load will be too heavy, and the subordinate terminal of the macro base station can report the closed user group information obtained by scanning after receiving the system information. The pico cell base station, the macro base station sends the message to the pico cell base station by unicast or multicast after receiving the scanning report of the terminal. Wherein, the scanning may be triggered by the system information, that is, the system information includes an instruction to scan closed subscriber group pico cell base stations, and the terminal scans or blind scans according to the information after receiving the system information; or , the scanning may be performed by the terminal according to other broadcast information of the macro base station, where the other broadcast information may be summary closed subscriber group pico cell base station information, such as closed subscriber group pico cell base station preamble range.

The transmission mode is a combination of one or more of the following modes: when broadcast, multicast, and unicast, the indication can be a management message of the MAC layer, and the message can be a broadcast or multicast message containing the indication information. or unicast messages. At this time, the system should allocate specific resources for the message interaction between the macro base station and the pico cell base station, such as: time resources, and/or frequency resources, and/or connection identification resources; the pico cell base station can distinguish whether to demodulate the message through specific resources . For example, if the message is a broadcast message, the system allocates a specific time-frequency resource and a broadcast connection identifier to the message, and all pico cells receive the message using the broadcast connection identifier on the time-frequency resource, they should demodulation. For another example, if the message is a unicast message, and the system allocates a specific time-frequency resource and unicast connection identifier to the message, only the picocell base station using the unicast connection identifier should receive and resolve the message on the designated time-frequency resource. call the message.

In addition, when the indication is broadcast or multicast, the closed subscriber group pico cell base station that receives the indication may send an operation type conversion request to the macro base station or the network, and the macro base station or the network that receives the request message sends an operation type conversion request. Feedback is requested to confirm that the picocell base station can switch the working type or cannot switch the working type.

Steps 4b-4e: After receiving the indication, the pico cell base station of the complete closed subscriber group is converted into a partial closed subscriber group pico cell base station; after that, it sends feedback information to the network; the network notifies the macro base station of the feedback; the macro base station instructs The mobile station accesses the newly switched partial closed subscriber group picocell base station.

Wherein, for the mobile station that has already accessed the picocell base station, the macro base station instructs the mobile station to access the picocell base station after switching to the converted type, or the mobile station switches to the converted type. The adjacent base station of the pico cell base station; for a mobile station that has not accessed the pico cell base station before, the macro base station instructs the mobile station to access the pico cell base station after the mobile station's initial access conversion type, or the mobile station's initial access Neighboring base stations of the converted picocell base station. That is to say, the mobile station may switch or initially access the picocell base station, collectively referred to as accessing the picocell base station, and the following embodiments take the mobile station as an example after switching to the picocell base station.

Embodiment two:

In this embodiment, the pico-cell base station of the complete closed subscriber group is converted into the pico-cell base station of the partial closed subscriber group; instructed by the network; and the feedback information is sent to the network.

As shown in Figure 5, implementing load balancing in this embodiment includes the following steps:

Step 5a: The network instructs the pico-cell base station of the complete CSG to convert to the pico-cell base station of the partial CSG.

Steps 5b-5e: After receiving the indication, the pico cell base station of the complete closed subscriber group is converted into a partial closed subscriber group pico cell base station; after that, it sends feedback information to the network; the network notifies the macro base station of the feedback; the macro base station instructs The mobile station is handed over to the newly switched partial closed subscriber group picocell base station.

Embodiment three:

In this embodiment, the pico cell base station of the complete closed subscriber group is converted to the pico cell base station of the partial closed subscriber group; the macro base station indicates; before sending the indication, the pico cell base station notifies the network of its own working status information; the feedback information is sent to the network.

As shown in Figure 6, implementing load balancing in this embodiment includes the following steps:

Steps 6a-6b: The pico cell base station of the completely closed user group sends its own working status information to the network, and the network notifies the macro base station of the working status information of the pico cell base station;

Here, the working status information may be fed back by the pico cell base station in response to sending the working status information of the macro base station, or may be actively sent by the pico cell base station.

Step 6c: After receiving the working state information forwarded by the network, the macro base station instructs the pico cell base station of the complete CSG to switch to the pico cell base station of the partial CSG.

Steps 6d-6g: the processing flow is exactly the same as that of steps 4b-4e in the first embodiment.

Embodiment four:

In this embodiment, the pico cell base station of the complete closed subscriber group is converted to the pico cell base station of the partial closed subscriber group; the macro base station indicates; before sending the indication, the pico cell base station notifies the network of its own working status information; the feedback information is sent to the network.

As shown in Figure 7, implementing load balancing in this embodiment includes the following steps:

Steps 7a-7b: The pico cell base station of the completely closed user group sends working status information to the network, and the network notifies the macro base station of the working status information of the pico cell base station;

Here, the working status information may be fed back by the pico cell base station in response to sending the working status information of the network, or may be actively sent by the pico cell base station.

Steps 7c-7g: the processing flow is exactly the same as that of steps 6c-6g in Embodiment 3.

Embodiment five:

In this embodiment, the pico cell base station of the complete closed subscriber group is converted to the pico cell base station of the partial closed subscriber group; the network indicates; before sending the indication, the pico cell base station notifies the network of its own working status information; the feedback information is sent to the network.

As shown in Figure 8(a), implementing load balancing in this embodiment includes the following steps:

Step 8a: The pico cell base station of the completely closed user group sends the working status information to the network;

Here, the working status information may be fed back by the pico cell base station in response to sending the working status information of the network, or may be actively sent by the pico cell base station.

In this step, the working status information may also be fed back by the pico cell base station in response to sending the working status information of the macro base station, as shown in FIG. 8( b ).

Steps 8b-8f: the same processing flow as Steps 6c-6g in Embodiment 3.

Embodiment six:

In this embodiment, the partial closed subscriber group pico cell base station is converted to the complete closed subscriber group pico cell base station; the macro base station indicates; the feedback information is sent to the network.

As shown in Figure 9, implementing load balancing in this embodiment includes the following steps:

Step 9a: the macro base station instructs the partial CSG pico cell base station to convert to the complete CSG pico cell base station;

Step 9b: The pico cell base station instructs its subordinate CSG terminals to switch to the macro base station;

Steps 9c-9e: After receiving the instruction, the partial CSG pico cell base station switches to a complete CSG pico cell base station; then, sends feedback information to the network; the network notifies the macro base station of the feedback.

Embodiment seven:

In this embodiment, the partial closed subscriber group pico cell base station is converted to the complete closed subscriber group pico cell base station; the network indicates; the feedback information is sent to the network.

As shown in Figure 10, implementing load balancing in this embodiment includes the following steps:

Step 10a: the network instructs the partial CSG pico cell base station to convert to the full CSG pico cell base station;

Steps 10b-10e: the processing flow is exactly the same as that of steps 9b-9e in Embodiment 6.

Embodiment eight:

In this embodiment, the partial closed subscriber group pico cell base station is converted to the complete closed subscriber group pico cell base station; the macro base station indicates; before sending the instruction, the pico cell base station notifies the macro base station of its own working status information or sends the network feedback information to the network.

As shown in Figure 11(a), implementing load balancing in this embodiment includes the following steps:

Step 11a: some CSG pico cell base stations send working status information to the macro base station;

Here, the working status information may be fed back by the pico cell base station in response to sending the working status information of the macro base station, or may be actively sent by the pico cell base station.

In this step, the working status information may also be fed back by the pico cell base station in response to the sending of the working status information of the network, and the network further notifies the macro base station of the working status information of the pico cell base station, as shown in Figure 11(b) .

Steps 11b-11f: are completely the same as the processing flow of steps 9a-9e in Embodiment 6.

Embodiment nine:

In this embodiment, the partial closed subscriber group pico cell base station is converted to the complete closed subscriber group pico cell base station; the macro base station indicates; before sending the indication, the pico cell base station notifies the network of its own working status information and sends the feedback information to the network.

As shown in Figure 12, implementing load balancing in this embodiment includes the following steps:

Steps 12a-12b: Partial CSG pico cell base stations send working status information to the network, and the network notifies the macro base station of the pico cell base station working status information;

Here, the working status information may be fed back by the pico cell base station in response to sending the working status information of the network, or may be actively sent by the pico cell base station.

Steps 12c-12g: are completely the same as the processing flow of steps 9a-9e in Embodiment 6.

Embodiment ten:

In this embodiment, the partial closed subscriber group pico cell base station is converted to the complete closed subscriber group pico cell base station; the network indicates; before sending the indication, the pico cell base station notifies the network of its own working status information and sends feedback information to the network.

As shown in Figure 13, implementing load balancing in this embodiment includes the following steps:

Step 13a: Partial CSG pico cell base stations send working status information to the network;

Here, the working status information may be fed back by the pico cell base station in response to sending the working status information of the network, or may be actively sent by the pico cell base station.

Steps 13b-13f: the processing flow is exactly the same as that of steps 9a-9e in Embodiment 6.

Embodiment eleven to embodiment nineteen:

Corresponding to Embodiment 1 to Embodiment 9 respectively, as shown in Figure 14 to Figure 22, the processing flow and realization conditions of Embodiment 11 to Embodiment 9 are basically the same as those of Embodiment 1 to Embodiment 9, and the only The difference is that the pico cell base station sends the feedback information to the macro base station, and uses the uplink air interface from the pico cell base station to the macro base station to speed up the feedback process. Among them, after the macro base station receives the feedback information, it can notify the network of the feedback information, or not notify the network; generally, if the switch is instructed by the network, the feedback information should notify the network; if the switch is instructed by the macro base station, the feedback information can choose whether to notify network.

Embodiment 20:

Corresponding to Embodiment 10, as shown in Figure 23, the processing flow and implementation conditions of Embodiment 20 and Embodiment 10 are basically the same. Notifying the network of the working status information of the pico cell base station.

Embodiment 21 to Embodiment 40:

Corresponding to Embodiment 1 to Embodiment 211 respectively, as shown in Figure 24 to Figure 43, the processing flow and realization conditions of Embodiment 21 to Embodiment 40 are completely consistent with Embodiment 1 to Embodiment 20 , the only difference is that the macro base station in each corresponding embodiment is replaced by the pico cell base station of the open subscriber group.

That is to say, Embodiment 21 to Embodiment 40 use the pico cell base station of the open user group and the network as the controller. At this time, the corresponding scenario is that the users of the pico cell base station of the open user group are overloaded and the macro base station is overloaded, so , only the pico cells of the closed subscriber group can be used for load balancing, and the specific description will not be repeated here.

Embodiment forty-one:

In this embodiment, the fifth implementation scheme is adopted, and the other base stations are macro base stations, that is to say, the controller immediately sends a switching instruction to be a macro base station, as shown in FIG. 44 , and the specific processing flow is basically the same as steps 51-54.

Embodiment forty-two:

In this embodiment, the fifth implementation scheme is adopted, and the other base stations are pico cell base stations of the open user group, that is to say: the control party immediately sends a switching instruction to the pico cell base station of the open user group, as shown in Figure 45, the specific processing The flow is basically the same as steps 51-54.

Embodiment forty-three:

In this embodiment, the fifth implementation scheme is adopted, and the network is the network, that is to say: the controller immediately sends the conversion instruction to be the network, as shown in Figure 46(a) and 46(b), the specific processing flow is the same as in steps 51- 54 is basically the same.

In order to realize the above method, the present invention also proposes a system for realizing load balancing, including an instruction sending device, a picocell base station, and a mobile station; wherein,

The instruction sending device is used to indicate the switching type of the pico cell base station, or notify the pico cell base station of the mobile station information to be handed over;

Here, the instruction sending device may be a macro base station, or a pico cell base station of an open subscriber group, or a network; the conversion type is a conversion from a complete closed subscriber group pico cell base station to a partial closed subscriber group pico cell base station, or Switching from a partial closed subscriber group picocell base station to a full closed subscriber group picocell base station.

The pico cell base station is used to receive the instruction and switch its own type according to the instruction, or add the mobile station to be handed over to the accessible mobile station category;

Further, the pico cell base station is also used to feed back information to the instruction sending device; it is also used to instruct the subordinate non-closed subscriber group mobile station to switch to the macro base station;

The mobile station is used for accessing the converted pico cell base station or its neighboring base stations, or switching the pico cell base station.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (16)

1. A method for implementing load balancing, the method comprising: the base station of the pico cell receives the indication of the indication sending equipment and converts the type of the base station from a first type to a second type;

the first type is a picocell base station of a completely closed user group, and the second type is a picocell base station of a partially closed user group; or the first type is a picocell base station of a partially closed user group, and the second type is a picocell base station of a completely closed user group.

2. The method of claim 1, wherein after the picocell base station type conversion, the method further comprises: and the mobile station accesses the converted picocell base station or accesses the adjacent base station of the converted picocell base station.

3. The method of claim 2, wherein the mobile station accessing the converted picocell base station is: the mobile station is switched to the converted type of the picocell base station; and/or the mobile station initially accesses the converted type of picocell base station.

4. The method of claim 2, wherein after the picocell base station switches types, the method further comprises: and sending feedback information to the indication sending equipment.

5. The method of claim 4, wherein after the instructing the sending device to receive the feedback information, the method further comprises: the network or other base station is informed of the feedback information.

6. The method of claim 2, wherein prior to receiving the indication at the picocell base station, the method further comprises: and the picocell base station sends the self working state information to the indication sending equipment.

7. The method of claim 6, wherein the picocell base station sends its operating state information to the network, the method further comprising: the network informs other base stations of the received working state information.

8. The method of claim 6, wherein the sending the operating status information by the picocell base station is: the picocell base station actively transmits; or in response to information indicating the operational status of the transmitting device.

9. The method according to any of claims 1 to 8, wherein said transition is to change the type identification of the picocell base station physical layer, and/or medium access control layer signal description.

10. The method according to any of claims 1 to 8, wherein the indication sending device is a macro base station, or an open user group picocell base station, or a network.

11. The method according to any one of claims 1 to 8, wherein the indication sending device is a macro base station or an open user group pico cell base station, and the indication is sent over the air interface through the base station;

and/or the indication sending equipment is a network, and the indication is sent in a backhaul network through the network.

12. The method according to any one of claims 1 to 8, wherein the indication is sent via an air interface in a manner selected from one or more of the following: broadcast, multicast, unicast;

the indication is carried in downlink control information, and the indication is carried in control information of a physical layer; and/or in management messages of the medium access control layer.

13. The method of claim 12, further comprising: the system distributes specific resources for message interaction between the base stations; the specific resource is a time resource, and/or a frequency resource, and/or a connection identification resource.

14. The method according to claim 4 or 5, wherein the feedback information comprises information on whether the handover is successful or not, and/or resource information of a picocell base station, and/or load information of a picocell; the resource information is used resource information and/or free resource information.

15. A system for realizing load balance is characterized in that the system comprises an indication transmitting device, a picocell base station and a mobile station; wherein,

the indication sending equipment is used for indicating the conversion type of the picocell base station;

the picocell base station is used for receiving the indication and converting the type of the picocell base station;

the self type of the conversion is converted from a picocell base station of a completely closed user group to a picocell base station of a partially closed user group, or from the picocell base station of the partially closed user group to the picocell base station of the completely closed user group;

and the mobile station is used for accessing the converted picocell base station or the adjacent base station thereof.

16. The system of claim 15, wherein the indication sending device is a macro base station, or a picocell base station of an open user group, or a network.

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