CN106900013B - Method, device and system for resource management in BBU of CRAN system - Google Patents
Method, device and system for resource management in BBU of CRAN system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/48—Program initiating; Program switching, e.g. by interrupt
- G06F9/4806—Task transfer initiation or dispatching
- G06F9/4843—Task transfer initiation or dispatching by program, e.g. task dispatcher, supervisor, operating system
- G06F9/485—Task life-cycle, e.g. stopping, restarting, resuming execution
- G06F9/4856—Task life-cycle, e.g. stopping, restarting, resuming execution resumption being on a different machine, e.g. task migration, virtual machine migration
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5083—Techniques for rebalancing the load in a distributed system
- G06F9/5088—Techniques for rebalancing the load in a distributed system involving task migration
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- 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
Abstract
The invention provides a method for managing resources in BBU of CRAN system, wherein, a plurality of base stations on the BBU are divided into a cell specific part, a control plane entity and a user plane group, the method comprises: allocating fixed hardware resources for the cell-specific part and control plane entities; allocating a margin-adjustable user plane resource block to the user plane group, so that all user plane entities in the user plane group share hardware resources in the user plane resource block; wherein a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created in the BBU. According to the scheme of the invention, the utilization rate of hardware resources can be greatly improved, and the signaling overhead is greatly reduced.
Description
Technical Field
The present invention relates to a Cloud Radio Access Network (CRAN), and in particular, to a method, an apparatus, and a system for resource management in a BBU of a CRAN system.
Background
CRAN is considered a solution for future wireless cellular communication systems, which should enable the sharing of computing resources (e.g., general purpose processors, hardware accelerators, etc.), which can be used to help operators achieve higher hardware utilization, lower power consumption, and lower overall Cost of Ownership (TCO). CRAN is mainly characterized by a centralized Baseband Unit (BBU) and a distributed Remote Radio Unit (RRU), wherein the BBU and the RRU are connected through a high-bandwidth low-delay optical transmission network. While virtualization technology (virtualization technology) is applied to data centers, virtualization technology is introduced in the CRAN, so that functional entities of base stations in a baseband pool can be partially or wholly created as virtual machines, resulting in higher hardware utilization and reduced power consumption.
Currently, two leading architectures in the CRAN are shown in fig. 6 and fig. 7, respectively, and one dashed box in fig. 6 and fig. 7 represents one virtual machine. Wherein, in fig. 6, each base station on the BBU is created as a virtual machine; in fig. 7, for each base station on the BBU, the L2 layer and the L3 layer of the base station are created as one virtual machine, and the user-specific part of the L1 layer of the base station is created as one virtual machine, while the cell-specific part of each base station is implemented by hardware, respectively.
Based on the architecture shown in fig. 6, if there are N base stations on the BBU, N virtual machines are created on the BBU, and the local PRM of the BBU needs to allocate hardware resources with adjustable margins to the N virtual machines, respectively; based on the architecture shown in fig. 7, if there are N base stations on the BBU, 2 × N virtual machines are created on the BBU, and then the local PRM of the BBU needs to allocate fixed hardware resources to the cell specific portions of the N base stations, and allocate hardware resources with adjustable margins to the 2 × N virtual machines. It can be seen that, based on the existing CRAN architecture, virtual machines at least equal to the number of base stations need to be created on the BBU, and adjustable margin hardware resources need to be allocated for each virtual machine.
In addition, the introduction of virtualization technology also brings another problem to the CRAN, namely migration of virtual machines, which is also an important feature of the CRAN. For example, typically in the late midnight, the workload of a base station is very low, however, although the load of the base station processing is very low, it consumes almost the same energy as the busy period, in which case, if all base stations on the BBU with lower workload are migrated to another BBU with the same lower workload, the idle BBU can be shut down to reduce the power consumption of the baseband pool.
Based on the architecture shown in fig. 6, for N base stations on the BBU, N times of migration operations need to be performed; based on the architecture shown in fig. 7, 3 × N migration operations need to be performed for N base stations on the BBU. Therefore, based on the existing CRAN architecture, the base stations on the BBUs can be migrated only by multiple migration operations, and the excessive frequent migration operations bring more network load to the CRAN.
Disclosure of Invention
The invention aims to provide a method, a device and a system for resource management in BBU of CRAN system.
According to an aspect of the present invention, there is provided a method for resource management in a BBU of a CRAN system, wherein a plurality of base stations on the BBU are divided into a cell-specific part, a control plane entity, and a user plane group, the method comprising:
allocating fixed hardware resources for the cell-specific part and control plane entities;
allocating a margin-adjustable user plane resource block to the user plane group, so that all user plane entities in the user plane group share hardware resources in the user plane resource block;
wherein a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created in the BBU.
According to another aspect of the present invention, there is also provided an apparatus for resource management in a BBU of a CRAN system, wherein a plurality of base stations on the BBU are divided into a cell-specific part, a control plane entity, and a user plane group, the apparatus comprising:
a first allocating device, configured to allocate fixed hardware resources to the cell-specific part and the control plane entity;
second allocating means for allocating a margin-adjustable user plane resource block to the user plane group, so that all user plane entities in the user plane group share hardware resources in the user plane resource block;
wherein a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created in the BBU.
According to another aspect of the present invention, there is also provided a BBU in a CRAN system, wherein a plurality of base stations on the BBU are divided into a cell-specific part, a control plane entity, and a user plane group, and the BBU includes the apparatus of the present invention.
Compared with the prior art, the invention has the following advantages: by separating the user plane from the control plane, aiming at a plurality of base stations on the BBU, only one virtual machine needs to be created for a user plane group corresponding to the base stations, and one user plane resource block with adjustable allowance is allocated, so that all user plane entities in the user plane group can share hardware resources in the user plane resource block, thereby greatly saving signaling overhead for allocating resources and greatly improving the utilization rate of the hardware resources; in addition, the base station migration on the BBU can be quickly realized only by a few migration times, so that the signaling overhead and the network load in the migration process are greatly reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic diagram of the architecture of an exemplary CRAN system of the present invention;
FIG. 2 is a flowchart illustrating a method for resource management in BBUs of a CRAN system according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for migrating a plurality of base stations in a source BBU to a destination BBU in accordance with one embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an apparatus for resource management in BBUs of a CRAN system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a system for migrating a plurality of base stations in a source BBU to a destination BBU in accordance with one embodiment of the present invention;
FIG. 6 is an architectural diagram of an exemplary CRAN system of the prior art;
fig. 7 is a schematic diagram of the architecture of another exemplary CRAN system in the prior art.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Fig. 1 is a schematic diagram of the architecture of a CRAN system according to an example of the present invention. One BBU Pool of the CRAN system includes a plurality of BBUs, and a Global PRM (Pool Resources Management) for performing resource Management on the plurality of BBUs, also called Global PRM, where the BBUs are connected to the RRUs through Optical Front-half (Optical Front-half). As shown in fig. 1, a plurality of base stations on a BBU are divided into a Cell-specific Part (Cell-specific Part) (i.e., L1Cell-specific shown in fig. 1), a Control Plane entity (Control Plane entity), and a User Plane Group (User-Plane Group), where the BBU further includes a Local PRM, also called Local PRM, for performing Local resource management on the BBU; wherein the Cell-specific part corresponds to Cell-specific of L1 layer of the plurality of base stations, and the Control Plane entity corresponds to Control planes (Control planes) of L2 layer and L3 layer of the plurality of base stations; wherein, the User Plane group includes a plurality of User Plane entities (User Plane entries) (simply denoted as "UP entries" in fig. 1), one User Plane entity corresponds to a User-specific Part (UE-specific Part) of the L1 layer, a User Plane of the L2 layer, and a User Plane of the L3 layer of one of the plurality of base stations, that is, the User Plane group corresponding to the plurality of base stations is formed by grouping the User-specific Part (UE-specific Part) of the L1 layer, the User Plane of the L2 layer, and the User Plane of the L3 layer of each of the plurality of base stations into one User Plane entity. Wherein, a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created in the BBU. It should be noted that the specific part of the cell may be implemented directly by hardware, or may be implemented in the form of a virtual machine.
It should be noted that, although fig. 1 shows that all base stations on the BBU are divided into a cell-specific part, a control plane entity and a user plane group, and a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created on the BBU, those skilled in the art should understand that the processing capacity of the virtual machines may be limited, so all base stations on the BBU may be grouped, and the above-mentioned dividing operation and the operation of creating the virtual machine are performed for each group, for example, 100 base stations are shared on the BBU, the 100 base stations are divided into two groups, each group includes 50 base stations, and the above-mentioned dividing operation and the operation of creating the virtual machine are performed for the two groups of base stations, respectively.
Fig. 2 is a flowchart illustrating a method for resource management in BBUs of a CRAN system according to an embodiment of the present invention.
The method according to the present embodiment includes step S1 and step S2.
In step S1, the BBU allocates fixed hardware resources for the cell-specific part and the control plane entity.
Specifically, the BBU allocates fixed hardware resources for the cell-specific part through interaction between its local PRM and the cell-specific part; and allocates fixed hardware resources to the control plane entity through interactions between its local PRM and the control plane entity.
Wherein the local PRM allocates fixed hardware resources for the cell-specific part or the control plane entity by sending a resource allocation indication to the cell-specific part or the control plane entity (or the first virtual machine).
It should be noted that there is no strict sequence between the operation of the BBU allocating fixed hardware resources to the specific part of the cell and the operation of the BBU allocating fixed hardware resources to the control plane entity. For example, the BBU allocates fixed hardware resources to the cell specific portion and the control plane entity at the same time, or the BBU allocates fixed hardware resources to the cell specific portion first and then allocates fixed hardware resources to the control plane entity.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner of allocating fixed hardware resources for the cell-specific part and the control plane entity should be included in the scope of the present invention.
In step S2, the BBU allocates a margin-adjustable user plane resource block to the user plane group, so that all user plane entities in the user plane group share hardware resources in the user plane resource block.
Specifically, the BBU allocates a user plane resource block with an adjustable margin to the user plane group through the local PRM as needed, and any user plane entity of the user plane group can use hardware resources in the user plane resource block. Wherein the local PRM allocates the adjustable margin of user plane resource blocks for the user plane group by sending a resource allocation indication to the user plane group (or the second virtual machine).
As an example, the user plane group includes 4 user plane entities, the BBU measures that the hardware resource required by each user plane entity is about 15%, and the BBU allocates a user plane resource block including 70% of the hardware resource to the user plane group through the local PRM, and the remaining amount of the user plane resource block is 10% (i.e., 70% -4 × 15% ═ 10%).
It should be noted that the BBU may adjust the margin in the user plane resource block according to the requirement.
It should be noted that, in this embodiment, only one adjustable margin user plane resource block needs to be allocated for one user plane group, that is, only one allocation operation needs to be performed for all user plane entities in the user plane group, the margin in the allocated user plane resource block can be used for any user plane entity in the user plane group, and the margin in the user plane resource block is less than the sum of the margins required by each user plane entity.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner of allocating an adjustable margin user plane resource block to a user plane group, so that all user plane entities in the user plane group share the hardware resource in the user plane resource block, should be included in the scope of the present invention.
It should be noted that there is no strict sequence between step S1 and step S2, for example, the BBU may allocate a fixed hardware resource to a specific portion of a cell first, allocate a margin-adjustable user plane resource block to a user plane group, and allocate a fixed hardware resource to a control plane entity finally.
Note that, after step S1 and step S2, the BBU completes the initialization operation.
Then, as a preferable scheme, the method of this embodiment further includes the following steps: when one user plane entity in the user plane group needs to process a UE service request, creating a process corresponding to the user plane entity in the second virtual machine, wherein the process uses the shared hardware resource in the user plane resource block; and when the process is terminated, releasing the hardware resources occupied by the process into the user plane resource block.
As an example, after receiving a UE service request from a UE, a local PRM initiates an instruction for creating a user plane entity to a user plane group (or a second virtual machine) to indicate that one user plane entity in the user plane group needs to process the UE service request, and then a BBU creates a process corresponding to the user plane entity in the second virtual machine according to the instruction, where the process occupies hardware resources in a user plane resource block; then, when the process is terminated (e.g. when the service of the UE is terminated), the BBU releases the hardware resources occupied by the process back into the user plane resource block.
It should be noted that, the hardware resources occupied by the user plane entity in the process of processing the UE service request may be changed as needed, and the user plane group may periodically interact with the local PRM to report the change condition of the hardware resources occupied by the user plane entity.
As a preferable scheme, the method of this embodiment further includes the steps of: and when the occupied hardware resource in the user plane resource block reaches a first threshold value, forwarding the UE service request needing to be processed to the global PRM in the baseband pool, so that the global PRM provides the UE service request to other BBUs.
The occupied hardware resource in the user plane resource block reaches the first threshold, which may indicate that the unoccupied hardware resource in the user plane resource block is not sufficient to support processing of the UE service request (i.e., the user plane group is not currently suitable for processing the UE service request).
As an example, the first threshold is 90%, after receiving a UE service request from a UE, the local PRM determines that the occupied hardware resource in the current user plane resource block reaches 92%, and then the BBU forwards the UE service request to the global PRM in the baseband pool through the local PRM, so that the global PRM provides the UE service request to other BBUs, where the currently occupied hardware resource in the user plane resource blocks of the other BBUs is 40% (that is, the other BBUs are capable of processing the UE service request).
It should be noted that, the local PRM in the BBU may obtain the currently occupied hardware resource in the user plane resource block through the interaction with the user plane group (or the second virtual machine) in the BBU; the global PRM can acquire the resource use condition (including currently occupied hardware resources in user plane resource blocks in the BBUs) in each BBU through interaction with the local PRM in each BBU; thus, the local PRM of a BBU may be used to determine whether UE service requests need to be forwarded to other BBUs for processing, and the global PRM may be used to determine to which BBU in the baseband pool to forward the UE service request.
According to the operation of the embodiment, by separating the user plane and the control plane, for a plurality of base stations on the BBU, only one virtual machine needs to be created for a user plane group corresponding to the plurality of base stations, and one user plane resource block with adjustable margin is allocated, so that all user plane entities in the user plane group can share hardware resources in the user plane resource block, which greatly saves signaling overhead for allocating resources and can greatly improve the utilization rate of the hardware resources; furthermore, due to the separation (decoupling) of the control plane and the user plane, joint processing techniques in the CRAN, such as joint scheduling in the MAC, are made easier.
FIG. 3 is a flowchart illustrating a method for migrating a plurality of base stations in a source BBU to a destination BBU in accordance with one embodiment of the present invention. The method of the embodiment is mainly realized by the source BBU, the global PRM and the target BBU. The method according to the present embodiment includes step S201, step S202, step S203, step S204, step S205, and step S206.
In step S201, when the occupied hardware resource in the user plane resource block is lower than the second threshold, the source BBU sends a cell-specific migration request to the global PRM through its local PRM, so as to migrate the cell-specific portion in the source BBU to the destination BBU.
The cell-specific migration request is used for requesting to migrate a cell-specific part shared by the plurality of base stations in the source BBU, and the cell-specific migration request includes context data of the cell-specific part to be migrated. After receiving the cell specific migration request, the global PRM determines that the BBU needs to be migrated to the target BBU based on the resource use condition in each BBU; for example, the global PRM takes another BBU, which is occupied in the user plane resource block and is also lower than the second threshold, as the destination BBU.
As an example, the second threshold is 30%, when the hardware resource occupied by the process corresponding to one user plane entity in the user plane group is released or in the user plane resource block, the currently occupied hardware resource in the user plane resource block is 25%, the local PRM of the source BBU determines that the occupied hardware resource in the user plane resource block is lower than the second threshold through interaction with the user plane group, and then the local PRM sends a migration indication; after receiving the migration instruction, the specific part of the cell, which needs to be migrated, sends a cell specific migration request to the local PRM, so that the local PRM forwards the cell specific migration request to the global PRM, and the global PRM sends the cell specific migration request to the destination BBU, so as to migrate the specific part of the cell to the destination BBU.
Then, the global PRM receives a cell specific migration request from the source BBU, and after determining a destination BBU to which migration is required, forwards the cell specific migration request to the destination BBU.
In step S202, the destination BBU receives the cell specific part migration request from the source BBU, and combines the cell specific part corresponding to the cell specific part migration request into the cell specific part of the destination BBU according to the cell specific part migration request.
In step S203, the source BBU sends a user plane migration request to the global PRM through its local PRM to migrate the second virtual machine to the destination BBU.
The user plane migration request is used to request to migrate the user plane group corresponding to the plurality of base stations in the source BBU (i.e., migrate the second virtual machine corresponding to the user plane group), and the user plane migration request includes context data related to the user plane group.
For example, after receiving a migration instruction sent by the local PRM of the source BBU, the user plane group (second virtual machine) sends a user plane migration request to the local PRM, so that the local PRM forwards the user plane migration request to the global PRM, and the global PRM sends the user plane migration request to the destination BBU, so as to migrate the second virtual machine to the destination BBU.
Then, the global PRM receives a user plane migration request from the source BBU, and forwards the user plane migration request to the destination BBU.
In step S204, the destination BBU receives the user plane migration request from the source BBU, and creates a plurality of user plane entities corresponding to the user plane migration request in the user plane group of the destination BBU according to the user plane migration request.
As an example, the user plane group of the source BBU includes four user plane entities, the destination BBU receives the user plane migration request from the source BBU, and according to the user plane migration request, creates the four user plane entities in the user plane group of the destination BBU, and recovers context data in a second virtual machine corresponding to the user plane group in the source BBU.
In step S205, the source BBU sends a control plane migration request to the global PRM through its local PRM, so as to migrate a first virtual machine corresponding to the control plane entity in the source BBU to the destination BBU.
The control plane migration request is used to request to migrate a control plane entity (that is, migrate a first virtual machine corresponding to the control plane entity) shared by the plurality of base stations in the source BBU, where the control plane migration request includes context data related to the control plane entity.
For example, after receiving a migration instruction sent by the local PRM of the source BBU, the control plane entity (the first virtual machine) sends a control plane migration request to the local PRM, so that the local PRM forwards the control plane migration request to the global PRM, and then the global PRM sends the control plane migration request to the destination BBU, so as to migrate the first and second virtual machines to the destination BBU.
Then, the global PRM receives a control plane migration request from the source BBU and forwards the control plane migration request to the destination BBU.
In step S206, the destination BBU receives the control plane migration request from the source BBU, and combines the control plane entity corresponding to the control plane migration request in the source BBU with the control plane entity of the BBU according to the control plane migration request. To this end, a plurality of base stations of the source BBU are migrated into the destination BBU.
The execution order of the steps shown in fig. 3 is not necessarily the actual execution order. For example, after receiving a cell specific migration request, a user plane migration request, and a control plane migration request from a source BBU, a destination BBU may combine a cell specific part corresponding to the cell specific part migration request into the cell specific part of the BBU according to the cell specific part migration request, create a plurality of user plane entities corresponding to the user plane migration request in the user plane group of the BBU according to the user plane migration request, and combine a control plane entity corresponding to the control plane migration request into the control plane entity of the BBU according to the control plane migration request.
According to the scheme of the embodiment, the base station migration on the BBU can be quickly realized only by a few times of migration, so that the signaling overhead and the network load in the migration process are greatly reduced; for example, when all base stations on a BBU are divided into a cell-specific part, a control plane entity, and a user plane group, only three migration operations are required to complete the migration of all base stations on the BBU.
Fig. 4 is a schematic structural diagram of an apparatus for resource management in BBUs of a CRAN system according to an embodiment of the present invention. The apparatus for resource management (hereinafter, simply referred to as "resource management apparatus") includes a first allocation apparatus 1 and a second allocation apparatus 2.
The first allocation means 1 in the BBU allocate fixed hardware resources for the cell specific part and the control plane entity.
Specifically, the first allocating means 1 allocates fixed hardware resources for the cell-specific part through interaction between its local PRM and the cell-specific part; and allocates fixed hardware resources to the control plane entity through interactions between its local PRM and the control plane entity.
Wherein the local PRM allocates fixed hardware resources for the cell-specific part or the control plane entity by sending a resource allocation indication to the cell-specific part or the control plane entity (or the first virtual machine).
It should be noted that there is no strict sequence between the operation of the first allocating device 1 allocating fixed hardware resources to the specific part of the cell and the operation of the first allocating device 1 allocating fixed hardware resources to the control plane entity. For example, the first allocating apparatus 1 allocates fixed hardware resources to the cell specific portion and the control plane entity at the same time, or the first allocating apparatus 1 allocates fixed hardware resources to the cell specific portion first and then allocates fixed hardware resources to the control plane entity.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner of allocating fixed hardware resources for the cell-specific part and the control plane entity should be included in the scope of the present invention.
The second allocating means 2 of the BBU allocates a margin adjustable user plane resource block to a user plane group, so that all user plane entities in said user plane group share hardware resources in said user plane resource block.
Specifically, the second allocating device 2 allocates the adjustable margin user plane resource block to the user plane group through the local PRM as needed, and any user plane entity of the user plane group can use the hardware resource in the user plane resource block. Wherein the local PRM causes the second allocating means 2 to allocate the adjustable margin of user plane resource blocks for the user plane group by sending a resource allocation indication to the user plane group (or the second virtual machine).
As an example, the user plane group includes 4 user plane entities, and the second allocating apparatus 2 estimates that the hardware resource required by each user plane entity is about 15%, then the second allocating apparatus 2 allocates a user plane resource block including 70% of the hardware resource to the user plane group by the local PRM, and the remaining amount of the user plane resource block is 10% (i.e. 70% -4% × 15% ═ 10%).
It should be noted that the second allocating device 2 may adjust the margin in the user plane resource block according to the requirement.
It should be noted that, in this embodiment, only one adjustable margin user plane resource block needs to be allocated for one user plane group, that is, only one allocation operation needs to be performed for all user plane entities in the user plane group, the margin in the allocated user plane resource block can be used for any user plane entity in the user plane group, and the margin in the user plane resource block is less than the sum of the margins required by each user plane entity.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner of allocating an adjustable margin user plane resource block to a user plane group, so that all user plane entities in the user plane group share the hardware resource in the user plane resource block, should be included in the scope of the present invention.
It should be noted that there is no strict sequence between the operations performed by the first allocating device 1 and the second allocating device 2, for example, the first allocating device 1 performs the operation first to allocate fixed hardware resources to a specific cell, then the second allocating device 2 performs the operation to allocate user plane resource blocks with adjustable margins to a user plane group, and finally the first allocating device 1 performs the operation again to allocate fixed hardware resources to a control plane entity.
It should be noted that after the first allocation apparatus 1 and the second allocation apparatus 2 perform the operations, the BBU completes the initialization operation.
Then, as a preferable solution, the resource management apparatus of this embodiment further includes a process creation apparatus (not shown) and a release apparatus (not shown). When one user plane entity in the user plane group needs to process a UE service request, a process creating device creates a process corresponding to the user plane entity in the second virtual machine, wherein the process uses the shared hardware resource in the user plane resource block; and when the process is terminated, the releasing device releases the hardware resources occupied by the process to the user plane resource block. It should be noted that the process creating device and the releasing device are located in the second virtual machine.
As an example, after receiving a UE service request from a UE, a local PRM initiates an instruction for creating a user plane entity to a user plane group (or a second virtual machine) to indicate that one user plane entity in the user plane group needs to process the UE service request, and then a process creating device creates a process corresponding to the user plane entity in the second virtual machine according to the instruction, where the process occupies a hardware resource in a user plane resource block; then, when the process is terminated (e.g. when the service of the UE is terminated), the releasing means releases the hardware resources occupied by the process back into the user plane resource blocks.
It should be noted that, the hardware resources occupied by the user plane entity in the process of processing the UE service request may be changed as needed, and the user plane group may periodically interact with the local PRM to report the change condition of the hardware resources occupied by the user plane entity.
As a preferable solution, the resource management apparatus of this embodiment further includes a forwarding apparatus (not shown). When the occupied hardware resource in the user plane resource block reaches a first threshold value, the forwarding device forwards the UE service request to be processed to the global PRM in the baseband pool, so that the global PRM provides the UE service request to other BBUs. It should be noted that, preferably, the forwarding device is integrated into the local PRM.
The occupied hardware resource in the user plane resource block reaches the first threshold, which may indicate that the unoccupied hardware resource in the user plane resource block is not sufficient to support processing of the UE service request (i.e., the user plane group is not currently suitable for processing the UE service request).
As an example, the first threshold is 90%, after receiving a UE service request from a UE, the local PRM determines that an occupied hardware resource in a current user plane resource block reaches 92%, and then the forwarding device forwards the UE service request to the global PRM in the baseband pool through the local PRM, so that the global PRM provides the UE service request to other BBUs, where the currently occupied hardware resource in the user plane resource blocks of the other BBUs is 40% (that is, the other BBUs are capable of processing the UE service request).
It should be noted that, the local PRM in the BBU may obtain the currently occupied hardware resource in the user plane resource block through the interaction with the user plane group (or the second virtual machine) in the BBU; the global PRM can acquire the resource use condition (including currently occupied hardware resources in user plane resource blocks in the BBUs) in each BBU through interaction with the local PRM in each BBU; thus, the local PRM of a BBU may be used to determine whether UE service requests need to be forwarded to other BBUs for processing, and the global PRM may be used to determine to which BBU in the baseband pool to forward the UE service request.
According to the operation of the embodiment, by separating the user plane and the control plane, for a plurality of base stations on the BBU, only one virtual machine needs to be created for a user plane group corresponding to the plurality of base stations, and one user plane resource block with adjustable margin is allocated, so that all user plane entities in the user plane group can share hardware resources in the user plane resource block, which greatly saves signaling overhead for allocating resources and can greatly improve the utilization rate of the hardware resources; furthermore, due to the separation (decoupling) of the control plane and the user plane, joint processing techniques in the CRAN, such as joint scheduling in the MAC, are made easier.
FIG. 5 is a schematic structural diagram of a system for migrating a plurality of base stations in a source BBU to a destination BBU in accordance with one embodiment of the present invention. The system of the embodiment comprises a source BBU, a global PRM and a target BBU. Wherein said source BBU comprises first transmitting means 3, second transmitting means 4 and third transmitting means 5, and said destination BBU comprises first migrating means 6, second migrating means 7 and third migrating means 8. It should be noted that, as will be understood by those skilled in the art, fig. 5 only shows the apparatus actually performing the operation when the BBU is used as the source BBU or the destination BBU, and in fact, any BBU should include the above-mentioned first sending apparatus 3, second sending apparatus 4, third sending apparatus 5, first migration apparatus 6, second migration apparatus 7 and third migration apparatus 8.
When the occupied hardware resource in the user plane resource block is lower than the second threshold, the first transmitting device 3 of the source BBU transmits a cell specific migration request to the global PRM through the local PRM, so as to migrate the cell specific part in the source BBU to the destination BBU.
The cell-specific migration request is used for requesting to migrate a cell-specific part shared by the plurality of base stations in the source BBU, and the cell-specific migration request includes context data of the cell-specific part to be migrated. After receiving the cell specific migration request, the global PRM determines that the BBU needs to be migrated to the target BBU based on the resource use condition in each BBU; for example, the global PRM takes another BBU, which is occupied in the user plane resource block and is also lower than the second threshold, as the destination BBU.
As an example, the second threshold is 30%, when the hardware resource occupied by the process corresponding to one user plane entity in the user plane group is released or in the user plane resource block, the currently occupied hardware resource in the user plane resource block is 25%, the local PRM of the source BBU determines that the occupied hardware resource in the user plane resource block is lower than the second threshold through interaction with the user plane group, and then the local PRM sends a migration indication; after receiving the migration instruction, the specific portion of the cell that needs to be migrated triggers the first sending apparatus 3 to send a specific migration request to the local PRM, so that the local PRM forwards the specific migration request to the global PRM, and the global PRM sends the specific migration request to the destination BBU to migrate the specific portion of the cell to the destination BBU.
Then, the global PRM receives a cell specific migration request from the source BBU, and after determining a destination BBU to which migration is required, forwards the cell specific migration request to the destination BBU.
The first migration means 6 of the destination BBU receives the cell-specific part migration request from the source BBU and combines the cell-specific part corresponding to the cell-specific part migration request into the cell-specific part of the destination BBU according to the cell-specific part migration request.
The second sending means 4 of the source BBU sends a user plane migration request to the global PRM through its local PRM to migrate the second virtual machine to the destination BBU.
The user plane migration request is used to request to migrate the user plane group corresponding to the plurality of base stations in the source BBU (i.e., migrate the second virtual machine corresponding to the user plane group), and the user plane migration request includes context data related to the user plane group.
For example, after receiving the migration instruction sent by the local PRM of the source BBU, the user plane group (second virtual machine) triggers the second sending apparatus 4 to send a user plane migration request to the local PRM, so that the local PRM forwards the user plane migration request to the global PRM, and the global PRM sends the user plane migration request to the destination BBU, so as to migrate the second virtual machine to the destination BBU.
Then, the global PRM receives a user plane migration request from the source BBU, and forwards the user plane migration request to the destination BBU.
The second migration means 7 of the destination BBU comes from the user plane migration request of the source BBU and creates, according to said user plane migration request, a plurality of user plane entities corresponding to said user plane migration request in the user plane group of the destination BBU.
As an example, the user plane group of the source BBU includes four user plane entities, the second migration apparatus 7 of the destination BBU receives the user plane migration request from the source BBU, creates the four user plane entities in the user plane group of the destination BBU according to the user plane migration request, and restores the context data in the second virtual machine corresponding to the user plane group in the source BBU.
The third sending means 5 of the source BBU sends a control plane migration request to the global PRM through its local PRM to migrate the first virtual machine corresponding to the control plane entity in the source BBU to the destination BBU.
The control plane migration request is used to request to migrate a control plane entity (that is, migrate a first virtual machine corresponding to the control plane entity) shared by the plurality of base stations in the source BBU, where the control plane migration request includes context data related to the control plane entity.
For example, after receiving the migration instruction sent by the local PRM of the source BBU, the control plane entity (the first virtual machine) triggers the third sending device 5 to send a control plane migration request to the local PRM, so that the local PRM forwards the control plane migration request to the global PRM, and the global PRM sends the control plane migration request to the destination BBU, so as to migrate the first and second virtual machines to the destination BBU.
Then, the global PRM receives a control plane migration request from the source BBU and forwards the control plane migration request to the destination BBU.
The third migration apparatus 8 of the destination BBU receives the control plane migration request from the source BBU, and combines the control plane entity corresponding to the control plane migration request in the source BBU into the control plane entity of the BBU according to the control plane migration request. To this end, a plurality of base stations of the source BBU are migrated into the destination BBU.
According to the scheme of the embodiment, the base station migration on the BBU can be quickly realized only by a few times of migration, so that the signaling overhead and the network load in the migration process are greatly reduced; for example, when all base stations on a BBU are divided into a cell-specific part, a control plane entity, and a user plane group, only three migration operations are required to complete the migration of all base stations on the BBU.
It is noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, the various means of the invention may be implemented using Application Specific Integrated Circuits (ASICs) or any other similar hardware devices. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (11)
1. A method for resource management in a BBU of a CRAN system, wherein a plurality of base stations on the BBU are divided into a cell-specific part, a control plane entity and a user plane group, the method comprising:
allocating fixed hardware resources for the cell-specific part and control plane entities;
allocating a margin-adjustable user plane resource block to the user plane group, so that all user plane entities in the user plane group share hardware resources in the user plane resource block;
wherein a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created in the BBU.
2. The method of claim 1, wherein the method further comprises:
when one user plane entity in the user plane group needs to process a UE service request, creating a process corresponding to the user plane entity in the second virtual machine, wherein the process uses the shared hardware resource in the user plane resource block;
and when the process is terminated, releasing the hardware resources occupied by the process into the user plane resource block.
3. The method of claim 1, wherein the method further comprises:
and when the occupied hardware resource in the user plane resource block reaches a first threshold value, forwarding the UE service request needing to be processed to the global PRM in the baseband pool, so that the global PRM provides the UE service request to other BBUs.
4. The method of claim 1 or 2, wherein the method further comprises:
when the occupied hardware resource in the user plane resource block is lower than a second threshold value, sending a cell specific migration request to a global PRM through a local PRM in the BBU so as to migrate the cell specific part to other BBUs;
sending a user plane migration request to a global PRM through the local PRM so as to migrate the second virtual machine to other BBUs;
sending a control plane migration request to a global PRM through the local PRM so as to migrate the first virtual machine to other BBUs.
5. The method of claim 1 or 2, wherein the method further comprises:
receiving cell specific part migration requests from other BBUs, and combining a cell specific part corresponding to the cell specific part migration request into the cell specific part of the BBU according to the cell specific part migration requests;
receiving user plane migration requests from other BBUs, and creating a plurality of user plane entities corresponding to the user plane migration requests in the user plane group of the BBU according to the user plane migration requests;
receiving control plane migration requests from other BBUs, and combining a control plane entity corresponding to the control plane migration request into the control plane entity of the BBU according to the control plane migration requests.
6. An apparatus for resource management in a BBU of a CRAN system, wherein a plurality of base stations on the BBU are divided into a cell-specific part, a control plane entity, and a user plane group, the apparatus comprising:
a first allocating device, configured to allocate fixed hardware resources to the cell-specific part and the control plane entity;
second allocating means for allocating a margin-adjustable user plane resource block to the user plane group, so that all user plane entities in the user plane group share hardware resources in the user plane resource block;
wherein a first virtual machine corresponding to the control plane entity and a second virtual machine corresponding to the user plane group are created in the BBU.
7. The apparatus of claim 6, wherein the apparatus further comprises:
a process creating device, configured to create, when a user plane entity in the user plane group needs to process a UE service request, a process corresponding to the user plane entity in the second virtual machine, where the process uses a hardware resource shared in the user plane resource block;
and the releasing device is used for releasing the hardware resources occupied by the process to the user plane resource block when the process is terminated.
8. The apparatus of claim 6, wherein the apparatus further comprises:
and the forwarding device is used for forwarding the UE service request needing to be processed to the global PRM in the baseband pool when the occupied hardware resource in the user plane resource block reaches a first threshold value, so that the global PRM provides the UE service request to other BBUs.
9. The apparatus of claim 6 or 7, wherein the apparatus further comprises:
a first sending device, configured to send a cell-specific migration request to a global PRM through the BBU when an occupied hardware resource in the user plane resource block is lower than a second threshold, so as to migrate the cell-specific portion to a destination BBU;
a second sending device, configured to send a user plane migration request to a global PRM through a local PRM, so as to migrate the second virtual machine to the destination BBU;
a third sending device, configured to send a control plane migration request to a global PRM through the local PRM, so as to migrate the first virtual machine to the destination BBU.
10. The apparatus of claim 6 or 7, wherein the apparatus further comprises:
a first migration device, configured to receive a cell specific part migration request from another BBU, and combine a cell specific part corresponding to the cell specific part migration request into a cell specific part of the BBU according to the cell specific part migration request;
a second migration device, configured to receive a user plane migration request from the other BBUs, and create, according to the user plane migration request, a plurality of user plane entities corresponding to the user plane migration request in the user plane group of the BBU;
and a third migration device, configured to receive the control plane migration request from the other BBUs, and combine, according to the control plane migration request, the control plane entity corresponding to the control plane migration request into the control plane entity of the BBU.
11. A BBU in a CRAN system, wherein a plurality of base stations on the BBU are divided into a cell-specific part, a control plane entity and a user plane group, the BBU comprising the apparatus of any one of claims 6 to 10.
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| CN103916909A (en) * | 2013-01-04 | 2014-07-09 | 中国移动通信集团公司 | Base band pool system |
| CN104080136A (en) * | 2013-03-31 | 2014-10-01 | 上海贝尔股份有限公司 | Method and device for achieving dynamic migration of virtual base stations in BBU pool |
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| CN102801806A (en) * | 2012-08-10 | 2012-11-28 | 薛海强 | Cloud computing system and cloud computing resource management method |
| CN103916909A (en) * | 2013-01-04 | 2014-07-09 | 中国移动通信集团公司 | Base band pool system |
| CN104080136A (en) * | 2013-03-31 | 2014-10-01 | 上海贝尔股份有限公司 | Method and device for achieving dynamic migration of virtual base stations in BBU pool |
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