WO2007138046A1 - Radio resource management method and central controller in mobile radio communication system - Google Patents
Radio resource management method and central controller in mobile radio communication system Download PDFInfo
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- WO2007138046A1 WO2007138046A1 PCT/EP2007/055182 EP2007055182W WO2007138046A1 WO 2007138046 A1 WO2007138046 A1 WO 2007138046A1 EP 2007055182 W EP2007055182 W EP 2007055182W WO 2007138046 A1 WO2007138046 A1 WO 2007138046A1
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- radio resources
- central controller
- cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/04—Traffic adaptive resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/12—Fixed resource partitioning
Definitions
- the present invention relates to mobile radio communication technology and, more specifically, to a radio resource management (RRM) method and a central controller (CC) in a mobile radio communication system.
- RRM radio resource management
- CC central controller
- Radio resource management is one core technique which determines the overall performance of a mobile radio communication system.
- a base station controller constitutes a radio resource management unit and conducts radio resource management in respect of system codes, time slots and transmission power, etc.
- a base station simply acts as a communication relay and serves to allow user equipment (UE) in its cell to communicate with an access network (AN).
- base stations are being provided with a certain degree of radio resource management functions, in order to support high- speed downlink packet access (HSDPA), but their radio resource management remains limited to management of high-speed downlink shared transmission channels (HS- DSCH), and other radio resource management functions are still fulfilled by base station controllers.
- HSDPA high-speed downlink packet access
- HS- DSCH high-speed downlink shared transmission channels
- radio resource management i.e. when a base station controller is the only or the principal radio resource management unit, there can be very serious delays in the process of scheduling of radio resources, with the result that the service quality of the mobile radio communication system deteriorates, since the radio communication system is unable to make timely responses to requests for the allocation of radio resources.
- 3GPPLTE 3rd-generation mobile radio communication system overall long-term evolution standards
- radio resource management is conducted jointly by a central controller and central units (CU), the central controller is used to conduct radio resource management between plural cells, and the central units are used to conduct radio resource management inside cells.
- a central controller replaces an existing base station controller, i.e. it replaces a radio network controller (RNC), and constitutes a unit for radio resource management between plural cells
- RNC radio network controller
- central units replace existing base stations, i.e. nodes B, and constitute units for radio resource management inside cells
- user plane functions in the radio network controller are fulfilled by gateway units (GW) in a core network (CN).
- GW gateway units
- radio resource management in the various cells is implemented by respective corresponding central units, and it is therefore possible to increase the speed of radio resource scheduling and increase the radio resource management efficiency.
- Many research results have already been obtained for methods directed to in-cell radio resource management. For example, there is a radio resource management based on maximum carrier interference ratios, and an equitable radio resources scheduling method, etc. However, one has yet to see any research findings regarding methods for managing radio resources between plural cells.
- the object of the present invention is to provide, on the basis of the above- described hierarchical radio resource management method, a method for managing radio resources in a mobile radio communication system and to make it possible to give consideration both to the effectiveness of the radio resource allocation method and the complexity of the implementation of the radio resource allocation procedure when the above-noted central controller is used to manage radio resources between plural cells.
- a further object of the invention is to provide a central controller which is used to manage radio resources between plural cells in a mobile radio communication system and which can match the complexity of implementation and at the same time ensure the effectiveness of radio resource allocation.
- the objects of the invention are realized through the following technical proposals.
- a method of managing radio resources in a mobile radio communication system in which a central controller is used for radio resource management between plural cells, and central units are used for radio resource management inside cells in a mobile radio communication system In the management of radio resources between cells, the central controller divides the radio resources in the system into two groups, effects static allocation of one group within the two groups of radio resources among plural cells, and effects dynamic allocation of the other group within the two groups of radio resources among plural cells in accordance with the loads of the various cells.
- the central controller when static allocation of one group within the two groups of radio resources is effected among plural cells by the above-noted central controller, the central controller uniformly divides the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re-use factor, and allocates these radio resource subgroups among plural cells.
- the central controller when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the central controller, the central controller effects respective allocation of different radio resources to cells in accordance with the loads of the various cells.
- the central controller when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the central controller, takes at least one group of cells which have basically the same load and re-use the same radio resources to constitute a cell cluster, takes the maximum cell load in a cell cluster to be the load of that cell cluster, and effects respective allocation of different radio resources to cell clusters in accordance with the loads of the various cell clusters.
- the dynamic allocation of the other group within the two groups of radio resources which is effected among plural cells by the central controller is effected in periodic mode.
- the central controller when dynamic allocation of the other group within the two groups of radio resources is effected in periodic mode by the central controller, the central controller adjusts the allocation period in accordance with cell performance measurement values.
- the loads of respective cells are measured and notified to the central controller by corresponding central units.
- the above-noted radio resources are subcarrier resources or code resources.
- a central controller which is used to implement radio resource management between plural cells in a mobile radio communication system and which comprises: a communication module which is used to conduct communications between plural central units in the system; and a control module which is used to divide radio resources in the system into two groups, and, acting via the communication module, to effect static allocation of one group within the above-noted two groups of radio resources among plural cells and effect dynamic allocation of the other group within the two groups of radio resources among plural cells in accordance with the loads of the various cells.
- the control module when static allocation of one group within the two groups of radio resources is effected among plural cells by the control module, the control module uniformly divides the radio resources in the group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re-use factor, and allocates these radio resource subgroups among plural cells.
- the control module when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module effects respective allocation of different radio resources to cells in accordance with the loads of the various cells.
- the control module when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module effects respective allocation of different radio resources to cells in accordance with the loads of the various cells.
- the control module when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module takes at least one group of cells which have basically the same load and re-use the same radio resources to constitute a cell cluster, takes the maximum cell load in a cell cluster to constitute the load of that cell cluster, and effects respective allocation of different radio resources to cell clusters in accordance with the loads of the various cell clusters.
- dynamic allocation of the other group within the two groups of radio resources which is effected among plural cells by the control module is effected in periodic mode.
- the control module when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells in periodic mode by the control module, the control module adjusts the allocation period in accordance with cell performance measurement values.
- Fig. 1 is a conceptual drawing of a mobile radio communication system in which a hierarchical radio resource management method is employed.
- Fig. 2 conceptually shows a flowchart of the method according to the invention.
- Fig. 3 is a conceptual drawing of the structure of a central controller according to the invention.
- the core concept of the present invention is based on a hierarchical radio resource management method, and a hybrid scheme of static allocation and dynamic allocation of radio resources is used in radio resource management between plural cells, thereby making it possible to give consideration both to the effectiveness of radio resource allocation and to the complexity of implementation at the time of allocation of radio resources between cells by a central controller.
- a central controller serves to implement radio resource management between plural cells in a mobile radio communication system, and central units serve to implement radio resource management within cells.
- the central controller first divides the radio resources in the system into two groups and then it takes one group within these two groups of radio resources and effects static allocation thereof among plural cells, and it takes the other group within the two groups of radio resources and effects dynamic allocation thereof among plural cells in accordance with the loads of the various cells, as indicated in Fig. 2.
- the central controller when static allocation of one group within the above-noted two groups of radio resources is effected between plural cells by the central controller, the central controller uniformly divides the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor, and allocates these radio resource subgroups among plural cells. For example, if the radio resource re -use factor is 3, the radio resources in the system are first uniformly divided into 3 radio resource subgroups, and then the central controller effects respective allocation of one radio resource subgroup to each cell within 3 neighboring cells constituting a group. This scheme makes the arrangement such that the 3 radio resource subgroups are re-used in 3 neighboring cells of different groups.
- the central controller allocates different radio resources to respective cells in accordance with the various cell loads.
- the central controller when static allocation of one group within the above-noted two groups of radio resources is effected between plural cells by the central controller, the central controller uniformly divides the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor, and allocates these radio resource subgroups among plural cells.
- the central controller since the central controller implements dynamic allocation of radio resources using cell clusters, not cells, as basic units, signalling load in the course of radio resource allocation can be reduced still more, and, at the same time, radio resource allocation delays can be reduced still more.
- multicarrier mobile radio communication systems especially orthogonal frequency division multiplex (OFDM) mobile radio communication systems are coming to represent a development trend for future mobile radio communication systems
- OFDM orthogonal frequency division multiplex
- a subcarrier resources management method will now be taken as an example to describe a further specific example of implementation of the method of the invention. It is supposed that an OFDM mobile radio communication system has 2048 subcarriers, that a central controller is used to manage subcarrier resources between plural cells, and that a central unit is used to manage subcarrier resources inside a cell.
- the central controller In the management of subcarrier resources between the cells, the central controller must divide the 2048 subcarriers into two groups, and, having reference to the relative proportions of a voice service and a data service, apportioning of 348 subcarriers in a statically allocated subcarrier group directed to voice service use is effected, this portion being designated as subcarrier group I, and the other subcarriers are apportioned as a dynamically allocated subcarrier group directed to data service use, and are designated as subcarrier group II.
- the central controller When static allocation of subcarriers in subcarrier group I is effected among plural cells by the central controller, first, the central controller further effects uniform division of subcarrier group I into subcarrier subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor. For example, if the radio resource re-use factor is 3, each group of 116 subcarriers in group I constitutes a subcarrier subgroup. After that, one subcarrier subgroup is respectively allocated by the central controller to each cell within 3 neighbouring cells constituting a group, and, in this scheme, re-use is effected using the 3 subcarrier subgroups in 3 neighbouring cells of different groups.
- the central controller can allocate different radio resources to respective cells or cell clusters in accordance with the loads of the various cells or cell clusters.
- the subcarrier resources management method in the specific example of implementation described above can be similarly applied to code or other radio resource management methods.
- the dynamic allocation of the other group in the two groups of radio resources among plural cells by the central controller may be effected in periodic mode, thereby further reducing the complexity of central controller implementation.
- a cell or cell cluster allocation period if it is found that the load of the cell or cell cluster does not change, dynamic radio resource allocation need only be effected once.
- the allocation periods of the various cells or cell clusters may be different, and be determined on the basis of statistical patterns of the load changes of respective cells or cell clusters.
- the allocation period of a cell or cell cluster can also be adjusted by the central controller on the basis of the performance measurement values of the cell or cell cluster. For example, if performance measurement values such as the call blockage ratio, the lost packet ratio and the service time delay, etc. of a cell in a succession of or a certain number of allocation periods all fail to satisfy preset performance values, the central controller shortens this cell's allocation period, whereas if performance measurement values such as the call blockage ratio, lost packet ratio and service time delay, etc. of a cell in a succession of or a certain number of allocation periods, all satisfy preset performance values, the central controller increases this cell's allocation period.
- the above-noted allocation period adjustment can be implemented in a stepwise manner, i.e. the amount of allocation period adjustment can be made a preset step length each time.
- the arrangement may also be that the amounts of the radio resources in the above-noted two sets are determined and adjusted by the central controller in accordance with the service requirements in the system. That is, although the term used is static allocation of one group within the two groups of radio resources, it is still possible for the amount of radio resources used in this static allocation to be adjusted in accordance with the circumstances of service requirements in the system, thereby making the radio resource management between plural cells more efficient and flexible. For example, if the demand for a realtime service such as a voice service, etc. in the system increases, the central controller can increase the amount of radio resources used in static allocation, and decrease the amount of radio resources for dynamic allocation.
- the central controller comprises a communication module, which is used for communications by plural central units in the system, and a control module, which serves to divide the radio resources in the system into two groups and, acting via the communication module, to effect static allocation of one of the two groups of radio resources among plural cells, and to effect dynamic allocation of the other of the two groups of radio resources among plural cells in accordance with the loads of the various cells.
- the control module when static allocation of one group within the above-noted two groups of radio resources is effected among plural cells by the control module, the control module may uniformly divide the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset re-use factor, and allocate these radio resource subgroups among plural cells.
- the control module may effect respective allocation of different radio resources to cells or cell clusters in accordance with the loads of the various cells or cell clusters.
- the dynamic allocation of the other group within the two groups of radio resources which is effected among plural cells by the control module may also be effected in periodic mode. If, in the allocation period of a cell or cell cluster, it is found that no change of the load of that cell or cell cluster occurs, radio resource dynamic allocation is effected only once, so making it possible to further reduce the complexity of central controller implementation. Further, the allocation period of a cell or cell cluster can be adjusted on the basis of performance measurement values of that cell or cell cluster, and, in this case, the performance measurement values of the cell or cell cluster are determined by the corresponding central unit and reported thereby to the control module.
Abstract
The present invention provides a method of managing radio resources in a mobile radio communication system in which, in the course of management of radio resources between cells on the basis of a currently proposed hierarchical radio resource management method, radio resources in the system are divided into two groups by a central controller, static allocation of one group within these two groups of radio resources is effected among plural cells, and dynamic allocation of the other group within the two groups of radio resources is effected among plural cells in accordance with the various cell loads. The invention also provides a suitable central controller, and thereby makes it possible to give consideration both to the effectiveness of radio resource allocation and to the complexity of implementation when the central controller allocates radio resources among plural cells.
Description
RADIO RESOURCE MANAGEMENT METHOD AND CENTRAL CONTROLLER IN MOBILE RADIO COMMUNICATION SYSTEM
The present invention relates to mobile radio communication technology and, more specifically, to a radio resource management (RRM) method and a central controller (CC) in a mobile radio communication system.
Radio resource management is one core technique which determines the overall performance of a mobile radio communication system. In existing mobile radio communication systems, e.g., 2nd- generation (2G) mobile communication systems which are now in commercial use and in 3rd- generation (3G) mobile radio communication systems which are about to come into commercial use, generally, a base station controller (BSC) constitutes a radio resource management unit and conducts radio resource management in respect of system codes, time slots and transmission power, etc., and a base station (BS) simply acts as a communication relay and serves to allow user equipment (UE) in its cell to communicate with an access network (AN). In the course of standardization of 3rd- generation mobile radio communication systems, base stations are being provided with a certain degree of radio resource management functions, in order to support high- speed downlink packet access (HSDPA), but their radio resource management remains limited to management of high-speed downlink shared transmission channels (HS- DSCH), and other radio resource management functions are still fulfilled by base station controllers.
In such a radio resource management scheme, i.e. when a base station controller is the only or the principal radio resource management unit, there can be very serious delays in the process of scheduling of radio resources, with the result that the service quality of the mobile radio communication system deteriorates, since the radio communication system is unable to make timely responses to requests for the allocation of radio resources. In order to resolve the problems associated with the above-described radio resource management method, a hierarchized radio resource management method has been proposed in 3rd-generation mobile radio communication system overall long-term evolution standards (3GPPLTE). In this method, radio resource management is
conducted jointly by a central controller and central units (CU), the central controller is used to conduct radio resource management between plural cells, and the central units are used to conduct radio resource management inside cells. In a 3rd-generation mobile radio communication system in which this hierarchical radio resource management method is adopted, as shown in Fig. 1, a central controller replaces an existing base station controller, i.e. it replaces a radio network controller (RNC), and constitutes a unit for radio resource management between plural cells, central units replace existing base stations, i.e. nodes B, and constitute units for radio resource management inside cells, and user plane functions in the radio network controller are fulfilled by gateway units (GW) in a core network (CN).
When the above-described hierarchical radio resource management method is used, radio resource management in the various cells is implemented by respective corresponding central units, and it is therefore possible to increase the speed of radio resource scheduling and increase the radio resource management efficiency. Many research results have already been obtained for methods directed to in-cell radio resource management. For example, there is a radio resource management based on maximum carrier interference ratios, and an equitable radio resources scheduling method, etc. However, one has yet to see any research findings regarding methods for managing radio resources between plural cells. The object of the present invention is to provide, on the basis of the above- described hierarchical radio resource management method, a method for managing radio resources in a mobile radio communication system and to make it possible to give consideration both to the effectiveness of the radio resource allocation method and the complexity of the implementation of the radio resource allocation procedure when the above-noted central controller is used to manage radio resources between plural cells.
A further object of the invention is to provide a central controller which is used to manage radio resources between plural cells in a mobile radio communication system and which can match the complexity of implementation and at the same time ensure the effectiveness of radio resource allocation. The objects of the invention are realized through the following technical proposals. A method of managing radio resources in a mobile radio communication system in which a central controller is used for radio resource management between plural cells, and central units are used for radio resource management inside cells in a
mobile radio communication system : In the management of radio resources between cells, the central controller divides the radio resources in the system into two groups, effects static allocation of one group within the two groups of radio resources among plural cells, and effects dynamic allocation of the other group within the two groups of radio resources among plural cells in accordance with the loads of the various cells.
According to one aspect of the method of the invention, when static allocation of one group within the two groups of radio resources is effected among plural cells by the above-noted central controller, the central controller uniformly divides the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re-use factor, and allocates these radio resource subgroups among plural cells.
According to one aspect of the method of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the central controller, the central controller effects respective allocation of different radio resources to cells in accordance with the loads of the various cells.
According to one aspect of the method of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the central controller, the central controller takes at least one group of cells which have basically the same load and re-use the same radio resources to constitute a cell cluster, takes the maximum cell load in a cell cluster to be the load of that cell cluster, and effects respective allocation of different radio resources to cell clusters in accordance with the loads of the various cell clusters.
According to one aspect of the method of the invention, the dynamic allocation of the other group within the two groups of radio resources which is effected among plural cells by the central controller is effected in periodic mode.
According to one aspect of the method of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected in periodic mode by the central controller, the central controller adjusts the allocation period in accordance with cell performance measurement values.
According to one aspect of the method of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among
plural cells by the central controller, the loads of respective cells are measured and notified to the central controller by corresponding central units.
According to one aspect of the method of the invention, the above-noted radio resources are subcarrier resources or code resources. A central controller which is used to implement radio resource management between plural cells in a mobile radio communication system and which comprises: a communication module which is used to conduct communications between plural central units in the system; and a control module which is used to divide radio resources in the system into two groups, and, acting via the communication module, to effect static allocation of one group within the above-noted two groups of radio resources among plural cells and effect dynamic allocation of the other group within the two groups of radio resources among plural cells in accordance with the loads of the various cells.
According to one aspect of the central controller of the invention, when static allocation of one group within the two groups of radio resources is effected among plural cells by the control module, the control module uniformly divides the radio resources in the group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re-use factor, and allocates these radio resource subgroups among plural cells. According to one aspect of the central controller of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module effects respective allocation of different radio resources to cells in accordance with the loads of the various cells. According to one aspect of the central controller of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module effects respective allocation of different radio resources to cells in accordance with the loads of the various cells. According to one aspect of the central controller of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module takes at least one group of cells which have basically the same load and re-use the same radio resources
to constitute a cell cluster, takes the maximum cell load in a cell cluster to constitute the load of that cell cluster, and effects respective allocation of different radio resources to cell clusters in accordance with the loads of the various cell clusters.
According to one aspect of the central controller of the invention, dynamic allocation of the other group within the two groups of radio resources which is effected among plural cells by the control module is effected in periodic mode.
According to one aspect of the central controller of the invention, when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells in periodic mode by the control module, the control module adjusts the allocation period in accordance with cell performance measurement values.
The objects and the special features of the present invention will now be described in detail by means of specific examples of implementation and the attached drawings. These specific examples of implementation are illustrative, and are non- limiting. Fig. 1 is a conceptual drawing of a mobile radio communication system in which a hierarchical radio resource management method is employed.
Fig. 2 conceptually shows a flowchart of the method according to the invention.
Fig. 3 is a conceptual drawing of the structure of a central controller according to the invention.
Since the radio resource re-use factor cannot be 1 in a practical system within currently proposed mobile radio communication systems, i.e. since the radio resources in a system cannot be re-used by each cell, and since a system needs to have a mechanism for radio resource management between cells, the core concept of the present invention is based on a hierarchical radio resource management method, and a hybrid scheme of static allocation and dynamic allocation of radio resources is used in radio resource management between plural cells, thereby making it possible to give consideration both to the effectiveness of radio resource allocation and to the complexity of implementation at the time of allocation of radio resources between cells by a central controller.
According to the method of the invention, a central controller serves to implement radio resource management between plural cells in a mobile radio
communication system, and central units serve to implement radio resource management within cells. In the radio resource management between the cells, the central controller first divides the radio resources in the system into two groups and then it takes one group within these two groups of radio resources and effects static allocation thereof among plural cells, and it takes the other group within the two groups of radio resources and effects dynamic allocation thereof among plural cells in accordance with the loads of the various cells, as indicated in Fig. 2.
According to one specific example of implementation of the method of the invention, when static allocation of one group within the above-noted two groups of radio resources is effected between plural cells by the central controller, the central controller uniformly divides the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor, and allocates these radio resource subgroups among plural cells. For example, if the radio resource re -use factor is 3, the radio resources in the system are first uniformly divided into 3 radio resource subgroups, and then the central controller effects respective allocation of one radio resource subgroup to each cell within 3 neighboring cells constituting a group. This scheme makes the arrangement such that the 3 radio resource subgroups are re-used in 3 neighboring cells of different groups. When dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the central controller, the central controller allocates different radio resources to respective cells in accordance with the various cell loads.
According to another specific example of implementation of the method of the invention, when static allocation of one group within the above-noted two groups of radio resources is effected between plural cells by the central controller, the central controller uniformly divides the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor, and allocates these radio resource subgroups among plural cells. However, what is done at the time when dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the central controller is that, first, at least one group of cells which have basically the same load and which re-use the same radio resources are taken by the central controller to constitute one cell cluster and the central controller takes the maximum cell load in a cell cluster to be that cell cluster's load, and then different radio resources are respectively allocated to cell clusters in
accordance with the various cell cluster loads. What is meant here by basically the same load is that the absolute value of the difference between the loads is less than a preset threshold value. In this example of implementation, since the central controller implements dynamic allocation of radio resources using cell clusters, not cells, as basic units, signalling load in the course of radio resource allocation can be reduced still more, and, at the same time, radio resource allocation delays can be reduced still more. Since multicarrier mobile radio communication systems, especially orthogonal frequency division multiplex (OFDM) mobile radio communication systems are coming to represent a development trend for future mobile radio communication systems, a subcarrier resources management method will now be taken as an example to describe a further specific example of implementation of the method of the invention. It is supposed that an OFDM mobile radio communication system has 2048 subcarriers, that a central controller is used to manage subcarrier resources between plural cells, and that a central unit is used to manage subcarrier resources inside a cell. In the management of subcarrier resources between the cells, the central controller must divide the 2048 subcarriers into two groups, and, having reference to the relative proportions of a voice service and a data service, apportioning of 348 subcarriers in a statically allocated subcarrier group directed to voice service use is effected, this portion being designated as subcarrier group I, and the other subcarriers are apportioned as a dynamically allocated subcarrier group directed to data service use, and are designated as subcarrier group II. When static allocation of subcarriers in subcarrier group I is effected among plural cells by the central controller, first, the central controller further effects uniform division of subcarrier group I into subcarrier subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor. For example, if the radio resource re-use factor is 3, each group of 116 subcarriers in group I constitutes a subcarrier subgroup. After that, one subcarrier subgroup is respectively allocated by the central controller to each cell within 3 neighbouring cells constituting a group, and, in this scheme, re-use is effected using the 3 subcarrier subgroups in 3 neighbouring cells of different groups. When dynamic allocation of the subcarriers in group II is effected among plural cells by the central controller, the central controller can allocate different radio resources to respective cells or cell clusters in accordance with the loads of the various cells or cell clusters.
Technical personnel in this field will easily see that the subcarrier resources management method in the specific example of implementation described above can be similarly applied to code or other radio resource management methods.
In each of the specific examples of implementation described above, the dynamic allocation of the other group in the two groups of radio resources among plural cells by the central controller may be effected in periodic mode, thereby further reducing the complexity of central controller implementation. In a cell or cell cluster allocation period, if it is found that the load of the cell or cell cluster does not change, dynamic radio resource allocation need only be effected once. The allocation periods of the various cells or cell clusters may be different, and be determined on the basis of statistical patterns of the load changes of respective cells or cell clusters.
The allocation period of a cell or cell cluster can also be adjusted by the central controller on the basis of the performance measurement values of the cell or cell cluster. For example, if performance measurement values such as the call blockage ratio, the lost packet ratio and the service time delay, etc. of a cell in a succession of or a certain number of allocation periods all fail to satisfy preset performance values, the central controller shortens this cell's allocation period, whereas if performance measurement values such as the call blockage ratio, lost packet ratio and service time delay, etc. of a cell in a succession of or a certain number of allocation periods, all satisfy preset performance values, the central controller increases this cell's allocation period. The above-noted allocation period adjustment can be implemented in a stepwise manner, i.e. the amount of allocation period adjustment can be made a preset step length each time.
In each of the examples of implementation described above, the arrangement may also be that the amounts of the radio resources in the above-noted two sets are determined and adjusted by the central controller in accordance with the service requirements in the system. That is, although the term used is static allocation of one group within the two groups of radio resources, it is still possible for the amount of radio resources used in this static allocation to be adjusted in accordance with the circumstances of service requirements in the system, thereby making the radio resource management between plural cells more efficient and flexible. For example, if the demand for a realtime service such as a voice service, etc. in the system increases, the
central controller can increase the amount of radio resources used in static allocation, and decrease the amount of radio resources for dynamic allocation.
When dynamic allocation of the other group within the two groups of radio resources is effected by the central controller in accordance with the loads of the various cells, the loads of respective cells are measured by corresponding central units and reported thereby to the central controller.
In order to implement the method according to the invention, as shown in Fig. 3, the central controller comprises a communication module, which is used for communications by plural central units in the system, and a control module, which serves to divide the radio resources in the system into two groups and, acting via the communication module, to effect static allocation of one of the two groups of radio resources among plural cells, and to effect dynamic allocation of the other of the two groups of radio resources among plural cells in accordance with the loads of the various cells. Similarly, in a specific example of implementation of the central controller according to the invention, when static allocation of one group within the above-noted two groups of radio resources is effected among plural cells by the control module, the control module may uniformly divide the radio resources in this group into radio resource subgroups of a suitable magnitude in accordance with a preset re-use factor, and allocate these radio resource subgroups among plural cells. When dynamic allocation of the other group within the two groups of radio resources is effected among plural cells by the control module, the control module may effect respective allocation of different radio resources to cells or cell clusters in accordance with the loads of the various cells or cell clusters. In the above-described specific example of implementation of the central controller according to the invention, the dynamic allocation of the other group within the two groups of radio resources which is effected among plural cells by the control module may also be effected in periodic mode. If, in the allocation period of a cell or cell cluster, it is found that no change of the load of that cell or cell cluster occurs, radio resource dynamic allocation is effected only once, so making it possible to further reduce the complexity of central controller implementation. Further, the allocation period of a cell or cell cluster can be adjusted on the basis of performance measurement values of that cell or cell cluster, and, in this case, the performance measurement values
of the cell or cell cluster are determined by the corresponding central unit and reported thereby to the control module.
Claims
1. A method of managing radio resources in a mobile radio communication system in which a central controller is used for radio resource management between plural cells, and central units are used for radio resource management inside cells in a mobile radio communication system and which is characterized in that, in said radio resource management between cells, said central controller divides the radio resources in said system into two groups, effects static allocation of one group within said two groups of radio resources among plural cells, and effects dynamic allocation of the other group within said two groups of radio resources among plural cells in accordance with the loads of the various cells.
2. The radio resource management method as claimed in claim 1 which is characterized in that, when static allocation of one group within said two groups of radio resources is effected among plural cells by said central controller, said central controller uniformly divides the radio resources in said group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re -use factor, and allocates said radio resource subgroups among plural cells.
3. The radio resource management method as claimed in claim 2 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected among plural cells by said central controller, said central controller effects respective allocation of different radio resources to cells in accordance with the loads of the various cells.
4. The radio resource management method as claimed in claim 2 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected among plural cells by said central controller, said central controller takes at least one group of cells which have basically the same load and re-use the same radio resources to constitute a cell cluster, takes the maximum cell load in a cell cluster to be the load of that cell cluster, and effects respective allocation of different radio resources to cell clusters in accordance with the loads of the various cell clusters.
5. The radio resource management method as claimed in any one of claims 1, 3 and 4, which is characterized in that the dynamic allocation of the other group within said two groups of radio resources which is effected among plural cells by said central controller is effected in periodic mode.
6. The radio resource management method as claimed in claim 5 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected in periodic mode by said central controller, said central controller adjusts said allocation period in accordance with cell performance measurement values.
7. The radio resource management method as claimed in any one of claims 1, 3 and 4 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected among plural cells by said central controller, the loads of respective cells are measured and notified to said central controller by corresponding central units.
8. The radio resource management method as claimed in any one of claims 1 through 4 which is characterized in that said radio resources are subcarrier resources or code resources.
9. The radio resource management method as claimed in any one of claims 1 through 4 which is characterized in that the quantities of said two sets of radio resources are determined and adjusted by said central controller in accordance with the service requirements in said system.
10. A central controller which is used to implement radio resource management between plural cells in a mobile radio communication system and which is characterized in that it comprises: a communication module which is used to conduct communications between plural central units in said system; and a control module which is used to divide radio resources in said system into two groups, and, acting via said communication module, to effect static allocation of one group within said two groups of radio resources among plural cells and effect dynamic allocation of the other group within said two groups of radio resources among plural cells in accordance with the loads of the various cells.
11. The central controller as claimed in claim 10 which is characterized in that, when static allocation of one group within said two groups of radio resources is effected among plural cells by said control module, said control module uniformly divides the radio resources in said group into radio resource subgroups of a suitable magnitude in accordance with a preset radio resource re-use factor, and allocates said radio resource subgroups among plural cells.
12. The central controller as claimed in claim 11 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected among plural cells by said control module, said control module effects respective allocation of different radio resources to cells in accordance with the loads of the various cells.
13. The central controller as claimed in claim 11 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected among plural cells by said control module, said control module takes at least one group of cells which have basically the same load and re-use the same radio resources to constitute a cell cluster, takes the maximum cell load in a cell cluster to constitute the load of that cell cluster, and effects respective allocation of different radio resources to cell clusters in accordance with the loads of the various cell clusters.
14. The central controller as claimed in any one of claims 10, 12 and 13 which is characterized in that dynamic allocation of the other group within said two groups of radio resources which is effected among plural cells by said control module is effected in periodic mode.
15. The central controller as claimed in claim 14 which is characterized in that, when dynamic allocation of the other group within said two groups of radio resources is effected among plural cells in periodic mode by said control module, said control module adjusts said allocation period in accordance with cell performance measurement values.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100842931A CN101083826A (en) | 2006-05-30 | 2006-05-30 | Wireless resource management method and central controller of wireless mobile communication system |
| CN200610084293.1 | 2006-05-30 | ||
| GB0617350.4 | 2006-09-05 | ||
| GB0617350A GB2441573B (en) | 2006-09-05 | 2006-09-05 | Radio resource management method and central controller in mobile radio communication system |
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| Publication Number | Publication Date |
|---|---|
| WO2007138046A1 true WO2007138046A1 (en) | 2007-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2007/055182 WO2007138046A1 (en) | 2006-05-30 | 2007-05-29 | Radio resource management method and central controller in mobile radio communication system |
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| Country | Link |
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| WO (1) | WO2007138046A1 (en) |
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