CN102857973A - Method and system for reconfiguring resources of cognitive radio system - Google Patents
Method and system for reconfiguring resources of cognitive radio system Download PDFInfo
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Abstract
The invention provides a method and a system for reconfiguring resources of a cognitive radio system. The method includes that a reconfiguring module at a network side node adjusts indications according to a received frequency spectrum or monitors network conditions of wireless communication systems, and operates a reconfiguring algorithm to obtain reconfiguring orders; and reconfiguring orders are sent to the base station, and the base station executes the reconfiguring orders to reconfigure resources. According to the method and the system for reconfiguring resources of the cognitive radio system, the reconfiguring orders are obtained through the reconfiguring module at the network side node according to received information, and spectrum resources are coordinated and allocated, accordingly, resources of the cognitive radio system can be overall managed, mutual interference is avoided, and access fairness of subsystems or operators to a free spectrum of a main system are guaranteed.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a method and a system for reconfiguring resources of a cognitive radio system.
Background
With the increasing demand for wireless communication services, especially high-end services, more frequency spectrums are planned for personal wireless communication services, and the practical problem is that the utilization rate of frequency spectrum resources is not high in the conventional fixed frequency spectrum allocation mode, and as the system requirements are diversified, the coexistence of multiple Radio Access Technologies (RATs) is the current situation.
From the current situation and the development trend of the current network operation, operators hope to uniformly manage different systems coexisting in a short term or a geographical position so as to adapt to the optimization of network traffic characteristics and resource utilization; operators want to be able to dynamically manage hardware resources and radio resources of existing systems and next generation systems according to the change of cell traffic residing in a specific area, and here, the new technology used is Cognitive Radio (CR) technology.
Generally, frequency spectrums used by operable wireless communication technologies are planned and distributed to operators through various forms, such as auction, by governments, and the usage authority and the range of the frequency spectrums are fixed and unchanged within a certain period of time, even if one operator owns a plurality of systems, more specifically, frequency spectrums allocated to the systems, the proportion of occupied frequency spectrums among the systems cannot be adjusted to enable the performance of the systems to reach the optimal requirement, and therefore, the overall management of resources such as frequency spectrums of cognitive radio systems applying the cognitive radio technologies is a problem to be solved urgently.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and a system for reconfiguring resources of a cognitive radio system, which can achieve overall management of spectrum resources.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of cognitive radio system resource reallocation, the method comprising:
the reconfiguration module located at the network side node operates a reconfiguration algorithm according to the received frequency spectrum adjustment instruction or the monitoring of the reconfiguration module on the network condition of each wireless communication system to obtain a reconfiguration command;
and sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
Further, the method further comprises:
the strategy control center generates a spectrum adjustment instruction according to the network overall planning and time schedule of an operator or after obtaining available spectrum resources through information interaction with a database; wherein the indication of spectral modification comprises an indication of a readjustment of spectral resources, an addition of a RAT, or an enhancement of existing RAT functionality.
Wherein, the reconfiguration module at the network side node runs the reconfiguration algorithm to obtain a reconfiguration command as follows:
a reconfiguration module located at a network management side or core network side node acquires a frequency spectrum adjustment instruction, frequency spectrum use condition information and load state information by carrying out information interaction with a strategy control center or monitoring the network condition of each wireless communication system;
and the reconfiguration module analyzes the acquired information and runs a reconfiguration algorithm to obtain a reconfiguration command.
The frequency spectrum use condition information is information of the use condition of each wireless communication system to the self authorized frequency spectrum and the borrowed frequency spectrum and the use condition of the frequency spectrum of the main system; the method specifically comprises the following steps: one or more of frequency point, working bandwidth, duration of idle frequency spectrum and emission parameter requirements;
the reconfiguration algorithm comprises the following steps: one or more of spectrum resource re-tuning, upgrading an existing RAT or placing a new RAT, adding multi-standard addition mode, radio resource optimization, secondary system to primary system spectrum borrowing.
The reconfiguration command is sent to the base station, and the base station executes the reconfiguration command to realize resource reconfiguration as follows:
the reconfiguration module sends the reconfiguration command to a Radio Resource Manager (RRM);
and the RRM controls the base station to execute reconfiguration according to the received reconfiguration command.
Further, after the executing the reconfiguration command by the base station, the method further comprises:
after the reconfiguration is completed, the base station replies a reconfiguration completion message to the RRM;
the RRM forwards the received reconfiguration completion message to the reconfiguration module;
the reconfiguration module acquires the network side performance information of the base station after executing reconfiguration according to the reconfiguration command by monitoring the network condition of each wireless communication system, and performs reconfiguration adjustment according to the acquired information.
A system for cognitive radio system resource reallocation, comprising a base station, the system further comprising: a reconfiguration module located at a network side node; wherein,
the reconfiguration module is used for operating a reconfiguration algorithm according to the received frequency spectrum adjustment instruction or monitoring the network state of each wireless communication system to obtain a reconfiguration command; and sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
Further, the system further comprises: a database, a policy control center; wherein,
the database is used for providing the spectrum state information of the main system and the use information of the main system idle spectrum by the reconfiguration module;
the strategy control center is used for generating a spectrum adjustment instruction according to the network overall planning and time schedule of an operator or after obtaining available spectrum resources through information interaction with the database; wherein the indication of spectral modification comprises an indication of a readjustment of spectral resources, an addition of a radio access technology, RAT, or an enhancement of existing RAT functionality.
The reconfiguration module is located at a node at a network management side or a core network side, and is specifically configured to perform information interaction with the policy control center to obtain a spectrum adjustment instruction, or obtain spectrum use condition information and load state information by monitoring network conditions of each wireless communication system; running a reconfiguration algorithm according to the acquired information to obtain a reconfiguration command;
the frequency spectrum use condition information is information of the use condition of each wireless communication system to the self authorized frequency spectrum and the borrowed frequency spectrum and the use condition of the frequency spectrum of the main system; the method specifically comprises the following steps: one or more of frequency point, working bandwidth, duration of idle frequency spectrum and emission parameter requirements;
the reconfiguration algorithm comprises the following steps: one or more of spectrum resource re-tuning, upgrading an existing RAT or placing a new RAT, adding multi-standard addition mode, radio resource optimization, secondary system to primary system spectrum borrowing.
Preferably, the system further comprises: RRM; wherein,
the reconfiguration module is further configured to send the reconfiguration command to the RRM;
and the RRM is used for controlling the base station to execute reconfiguration according to the received reconfiguration command.
The base station is a reconfigurable base station RBS and is used for replying a reconfiguration completion message to the RRM after reconfiguration is completed;
the RRM is further configured to forward the received reconfiguration complete message to the reconfiguration module;
the reconfiguration module is further configured to acquire, through monitoring network conditions of each wireless communication system, network side performance information after the base station performs reconfiguration according to the reconfiguration command, and perform reconfiguration adjustment according to the acquired information.
According to the invention, the reconfiguration module located at the network side node operates the reconfiguration algorithm according to the received information to obtain the reconfiguration command and realize the coordination and allocation of the spectrum resources, so that the resources of the cognitive radio system can be managed comprehensively, mutual interference is avoided, and the fairness of each secondary system or operator accessing the idle spectrum of the main system is ensured.
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FIG. 1 is a flowchart illustrating a method for resource reallocation in a cognitive radio system according to the present invention;
FIG. 2 is a block diagram of a system for resource reallocation in a cognitive radio system according to the present invention;
FIG. 3 is a diagram of a LTE system architecture implementing the method for cognitive radio system resource reallocation of the present invention;
FIG. 4 is a diagram of a GSM/UMTS system architecture for implementing the method for resource reallocation of a cognitive radio system of the present invention;
FIG. 5 is another block diagram of a GSM/UMTS system implementing the method for resource reallocation of a cognitive radio system of the present invention;
FIG. 6 is a diagram of an LTE system architecture for implementing the borrowing of spectrum resources of a primary system according to the present invention;
FIG. 7 is a block diagram of a GSM/UMTS system for implementing the present invention borrowing spectrum resources of a primary system;
FIG. 8 is another block diagram of a GSM/UMTS system for implementing the borrowing of spectrum resource reallocation of a primary system according to the present invention;
FIG. 9 is a block diagram of a hybrid network of an LTE system and a GSM/UMTS system for implementing the present invention by borrowing spectrum resources of a primary system;
fig. 10 is another structural diagram of a hybrid network of an LTE system and a GSM/UMTS system for implementing the primary system spectrum resource borrowing reconfiguration of the present invention.
Detailed Description
The basic idea of the invention is as follows: the reconfiguration module located at the network side node operates a reconfiguration algorithm according to the received frequency spectrum adjustment instruction or the monitoring of the reconfiguration module on the network condition of each wireless communication system to obtain a reconfiguration command; and sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
Fig. 1 shows a flow of a method for resource reallocation of a cognitive radio system according to the present invention, as shown in fig. 1, the method includes the following steps:
specifically, the common reconfiguration module of different wireless communication systems may be located in a network node on a core network side or a network node on a network management side, where the wireless communication system at least includes: global System for Mobile communications (GSM), Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE), and the like;
the reconfiguration module acquires frequency spectrum adjustment indication, frequency spectrum use condition information and load state information by carrying out information interaction with a strategy control center or monitoring network conditions of each wireless communication system; the reconfiguration module analyzes the acquired information and runs a prestored reconfiguration algorithm to obtain a reconfiguration command;
here, the spectrum usage information is information of usage of licensed spectrum and borrowed spectrum of each wireless communication system, and usage of spectrum of the primary system; the method specifically comprises the following steps: one or more of frequency point, working bandwidth, duration of idle frequency spectrum and emission parameter requirements; the main system can be a broadcast television system and the like;
the pre-stored reconfiguration algorithm includes: one or more of spectrum resource re-tuning, upgrading an existing RAT or placing a new RAT, adding multi-standard addition mode, radio resource optimization, secondary system to primary system spectrum borrowing.
It should be understood that prior to this step, the method further comprises: the strategy control center generates a spectrum adjustment instruction according to the network overall planning and time schedule of an operator or after obtaining available spectrum resources through information interaction with a database; wherein the indication of spectral modification comprises an indication of a readjustment of spectral resources, an addition of a RAT, or an enhancement of existing RAT functionality; specifically, a certain spectrum of RAT1 is replaced by RAT2, an LTE system is deployed in GSM, UMTS is upgraded to High Speed Packet Access (HSPA) technology, and so on.
And 102, sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
Specifically, the reconfiguration module may send the reconfiguration command to a Radio Resource Manager (RRM), and the RRM controls the base station to perform reconfiguration after receiving the reconfiguration command; here, the Base Station is a Reconfigurable Base Station (RBS) that can reconfigure hardware resources and radio resources and support a plurality of standard modes;
in addition, after this step, the method further comprises: after the reconfiguration is completed, the base station replies a reconfiguration completion message to the RRM; the RRM forwards the received reconfiguration completion message to the reconfiguration module; in addition, the reconfiguration module may further acquire, through detecting the conditions of each wireless communication network, network side performance information (such as interference condition information) after the base station performs reconfiguration according to the reconfiguration command, and perform necessary reconfiguration adjustment according to the acquired information, that is, perform the reconfiguration algorithm again to obtain the reconfiguration command and perform the subsequent processing as described in step 102.
Fig. 2 shows the structure of the system for resource reallocation of a cognitive radio system of the present invention, which comprises: the base station and the reconfiguration module are positioned at a network side node; wherein the base stations are RBSs, FIG. 2 schematically illustrates RBS1 and RBS 2;
the reconfiguration module is used for operating a reconfiguration algorithm according to the received frequency spectrum adjustment instruction or monitoring the network state of each wireless communication system to obtain a reconfiguration command; and sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
Further, the system further comprises: a database, a policy control center; wherein,
the database can be provided by a main system operator or a third party, and comprises main system spectrum state information of a local area or a plurality of local areas, use information of idle spectrums of the main system by each reconfiguration module covering different ranges or planned by the operator, and load information, communication quality condition information and use statistical rule information in the coverage range of each reconfiguration module; the system also comprises frequency spectrum etiquette information, such as interference avoidance strategies, frequency spectrum leasing rules and the like; the primary system spectrum state information comprises: the spectrum state in use comprises information such as frequency points, bandwidth, possible duration, coverage, isolation zones and the like; unused spectrum states including frequency point, bandwidth, coverage, possible duration, allowed maximum transmit power, etc. information; the spectrum information that is not allowed to be used, which may be regulatory domain restricted spectrum or operator reserved spectrum, includes: frequency point, bandwidth and the like. The usage information of the primary system idle spectrum by the reconfiguration module comprises: the idle spectrum used by the user and the position of the reconfiguration module. The database is responsible for providing each secondary system with its available primary system white space resources.
The strategy control center is used for generating a spectrum adjustment instruction according to the network overall planning and time schedule of an operator or after obtaining available spectrum resources through information interaction with the database; wherein the indication of spectral modification comprises an indication of a readjustment of spectral resources, an addition of a RAT, or an enhancement of existing RAT functionality; here, the policy control center may be located at a network Element on a network Management side, such as a network Element on an Element Management System (EMS) side or a network Element on a Network Management System (NMS) side, and is a functional module related to adding or upgrading a policy on a new RAT layout and when a main System idle spectrum resource needs to be borrowed; in practical application, the method can be operated by a network operator, and is also used for acquiring the spectrum use condition information of the primary system in the database and the like.
Further, the reconfiguration module is a node located at a network management side or a core network side, and is specifically configured to perform information interaction with the policy control center or monitor network conditions of each wireless communication system, and acquire a spectrum adjustment instruction and spectrum use condition information; running a reconfiguration algorithm according to the acquired information to obtain a reconfiguration command; specifically, the reconfiguration module is responsible for receiving and analyzing a spectrum adjustment instruction sent by the policy control center, receiving other entrusted triggering processes of the network side, and running a new function, a self-optimization process activated by a new RAT and a reconfiguration algorithm; and is also used for monitoring the cell activity state of the supported RAT after running the reconfiguration algorithm, determining the RBS to be reconfigured by executing the reconfiguration algorithm and sending a proper reconfiguration instruction to control the reconfiguration; the requirements of network reconfiguration and RBS resource reconfiguration can be evaluated by the aid of results reported by Mobile Devices (MD);
here, the reconfiguration command may include function enhancement information for the existing RAT, software version information, spectrum information of the new RAT, an effective time of the new function or the new RAT, an enhancement range of the new function, and the like.
The frequency spectrum use condition information is information of the use condition of each wireless communication system to the self authorized frequency spectrum and the borrowed frequency spectrum and the use condition of the frequency spectrum of the main system; the method specifically comprises the following steps: one or more of frequency point, working bandwidth, duration of idle frequency spectrum and emission parameter requirements;
the reconfiguration algorithm comprises the following steps: one or more of spectrum resource re-tuning, upgrading an existing RAT or placing a new RAT, adding multi-standard addition mode, radio resource optimization, secondary system to primary system spectrum borrowing.
Here, the system further includes: RRM; in the GSM/UMTS system, the RRM may be located in a Base Station Controller (BSC)/Radio Network Controller (RNC), or in an RBS; in an LTE system, the RRM may be located in an RBS;
the reconfiguration module is further configured to send the reconfiguration command to the RRM;
the RRM is used for controlling the base station to execute reconfiguration after receiving the reconfiguration command; here, the RRM is further configured to receive a channel request from the RBS for RBS channel allocation evaluation; managing requests and assignments of radio channels for the MD; indicating the software version to download and upgrade; monitoring the load condition of a cell; the reallocation of the RBS is indicated and the impact of the reallocation, such as interference tolerance etc., is evaluated and the resource allocation is indicated to the reallocation module.
Here, the base station (RBS1 or RBS2) is configured to reply a reconfiguration complete message to the RRM after the reconfiguration is completed; in particular, the RBS may support inter-RAT handover, such as GSM → UMTS, UMTS → LTE, etc.; and also for managing the utilization of Radio Resources (RRs) activated in configuring each supported RAT, dynamically managing hardware resources of existing and next generation systems; configuring a utilization of RR allocating activation of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in one or more modes; dynamic capacity optimization, such as energy conservation, load balancing, and the like; downloading from the network side to upgrade new functions, such as UMTS → HSPA +; provide radio resource management and services to user terminals, and the like.
The RRM is further configured to forward the received reconfiguration complete message to the reconfiguration module;
the reconfiguration module is further configured to acquire, through monitoring network conditions of each wireless communication system, network side performance information after the base station performs reconfiguration according to the reconfiguration command, and perform reconfiguration adjustment according to the acquired information.
Fig. 3 shows an LTE system structure for implementing the method for resource reconfiguration of a cognitive radio system of the present invention, as shown in fig. 3, RRM is located in RBS, and a reconfiguration module is located in a network element at a network management side/core network side; the following describes in detail a process of implementing the above method in the LTE system with reference to fig. 3.
Step one, a reconfiguration module collects information reported by a network side and receives a frequency spectrum adjustment instruction issued by a strategy control center;
specifically, when the information reported by the network side indicates that the load of a certain current cell is severe, the reconfiguration module needs to determine whether to operate a reconfiguration algorithm according to the load condition, the spectrum utilization condition and the like of cells around the cell; and when the strategy control center adjusts a certain frequency band used by the current LTE to the frequency spectrum of a higher-level system according to the time schedule of the network planning, transmitting a frequency spectrum adjustment instruction to the reconfiguration module.
Here, the spectrum adjustment indication includes a reconfiguration adjustment indication of a frequency resource, a certain spectrum currently used by the LTE system, an effective time (e.g., a time period in which the certain spectrum can be used), an area range, and the like.
Step two, the reconfiguration module analyzes the acquired information, runs a reconfiguration algorithm and sends a reconfiguration command to the RRM in the RBS;
the reconfiguration command includes: spectral information to be reshaped, validation time, region range, interference tolerance to adjacent bands, handover commands, etc.
And step three, after receiving the reconfiguration command from the reconfiguration module, the RRM evaluates the influence of the reallocated resources on the network side and controls the RBS to execute the reconfiguration command.
And step four, after receiving the reconfiguration command, the RBS reconfigures the resources in the effective time period according to the indication of the RRM.
And step five, after the RBS completes the resource reconfiguration, the RRM in the RBS replies a reconfiguration completion message to the reconfiguration module.
Fig. 4 shows a GSM/UMTS system structure for implementing the method for resource reconfiguration of a cognitive radio system of the present invention, as shown in fig. 4, RRM is located in RBS, and reconfiguration module is located in a network element at a network management side/core network side; the following describes the GSM/UMTS system internal resource optimization and GSM reconfiguration to UMTS in detail with reference to fig. 4.
Step one, a reconfiguration module collects information reported by a network side and receives a frequency spectrum adjustment instruction issued by a strategy control center;
specifically, when the information reported by the network side indicates that the load of a certain current GSM/UMTS system cell is severe, the reconfiguration module needs to judge whether a reconfiguration algorithm needs to be operated according to the load condition and the spectrum utilization condition of surrounding cells; and when the strategy control center adjusts a certain frequency band used by the current GSM into a frequency spectrum of the UMTS according to the time schedule of the network planning, transmitting a frequency spectrum adjustment instruction to the reconfiguration module.
Here, the spectrum adjustment instruction includes: an indication of reconfiguration of frequency resources, a certain segment of spectrum currently used by GSM, an effective time (e.g., a time period during which the segment of spectrum can be used), a region range, etc.
Step two, the reconfiguration module analyzes the received information, runs a reconfiguration algorithm, sends a reconfiguration command to the BSC/RNC, and is transmitted to the RRM in the RBS by the BSC/RNC;
the reconfiguration command includes: spectral information to be reshaped, validation time, region range, interference tolerance to adjacent bands, handover commands, etc.
And step three, after receiving the reconfiguration command from the reconfiguration module, the RRM evaluates the influence of the reallocated resources on the network side and controls the RBS to execute the reconfiguration command.
And step four, after receiving the reconfiguration instruction, the RBS reconfigures the resources in the effective time period according to the instruction of the RRM.
And step five, after the RBS completes the resource reallocation, RRM in the RBS replies a reallocation completion message to the BSC/RNC, and the BSC/RNC transmits the reallocation completion message to the reallocation module so as to confirm the completion of the reallocation.
After the reconfiguration is completed, the BSC of the original GSM is used as the RNC of the UMTS.
Further, the procedure is also applicable to the reverse procedure, i.e. the UMTS is reconfigured to GSM due to network planning; at this time, after the reconfiguration is completed, the original RNC of the UMTS is used as the BSC of the GSM.
Fig. 5 shows another structure of the GSM/UMTS system for implementing the method for reconfiguring resources of the cognitive radio system of the present invention, as shown in fig. 5, the RRM is located in the BSC/RNC, and the reconfiguration module is located in the network element on the network management side/core network side; the following describes the GSM/UMTS system internal resource optimization and GSM reconfiguration to UMTS in detail with reference to fig. 5.
Step one, a reconfiguration module collects information reported by a network side and receives a frequency spectrum adjustment instruction issued by a strategy control center;
specifically, when the information reported by the network side indicates that the load of a certain current GSM/UMTS system cell is severe, the reconfiguration module needs to judge whether a reconfiguration algorithm needs to be operated according to the load condition and the spectrum utilization condition of surrounding cells; and when the strategy control center adjusts a certain frequency band used by the current GSM into a frequency spectrum of the UMTS according to the time schedule of the network planning, transmitting a frequency spectrum adjustment instruction to the reconfiguration module.
Here, the spectrum adjustment instruction includes: an indication of reconfiguration of frequency resources, a certain segment of spectrum currently used by GSM, an effective time (e.g., a time period during which the segment of spectrum can be used), a region range, etc.
Step two, the reconfiguration module analyzes the received information, runs a reconfiguration algorithm and sends a reconfiguration command to the RRM in the BSC/RNC;
the reconfiguration command includes: spectral information to be reshaped, validation time, region range, interference tolerance to adjacent bands, handover commands, etc.
And step three, after receiving the reconfiguration command from the reconfiguration module, the RRM evaluates the influence of the reallocated resources on the network side and controls the RBS to execute the reconfiguration command.
And step four, after receiving the reconfiguration command, the RBS reconfigures the resources in the effective time period according to the indication of the RRM.
And step five, after the RBS completes the resource reconfiguration, replying a reconfiguration completion message to the RRM in the BSC/RNC, and forwarding the RRM to the reconfiguration module to confirm the completion of the reconfiguration.
After the reconfiguration is completed, the BSC of the original GSM is used as the RNC of the UMTS.
Further, the procedure is also applicable to the reverse procedure, i.e. the UMTS is reconfigured to GSM due to network planning; at this time, after the reconfiguration is completed, the original RNC of the UMTS is used as the BSC of the GSM.
Fig. 6 shows an LTE system structure for implementing the spectrum resource reconfiguration by using a main system (e.g. a broadcast television system) according to the present invention, where, as shown in fig. 6, the RRM is located in the RBS, and the reconfiguration module is located in a network element at a network pipe side/core network side; the following describes a procedure of borrowing white space resources (TVWS) of a broadcast television system by the LTE system in detail with reference to fig. 6.
Step one, a reconfiguration module collects information reported by a network side and receives a frequency spectrum adjustment instruction issued by a strategy control center;
specifically, when the information reported by the network side indicates that the load of a certain current cell is serious, the reconfiguration module needs to judge whether the TVWS spectrum resource can be borrowed according to the TVWS usage information acquired at the policy control center; the method comprises the following steps that a strategy control center acquires the use condition information of a main system spectrum resource through information interaction with a database;
here, the TVWS usage information includes: unused spectrum states; specifically, the frequency point, the working bandwidth, the coverage, the possible duration, the allowed maximum transmission power, and the like may be used.
Step two, the reconfiguration module analyzes the received information, runs a reconfiguration algorithm and sends a reconfiguration command to the RRM in the RBS;
the reconfiguration command includes: TVWS frequency points, operating bandwidth, coverage, possible duration, maximum allowed transmit power, etc.
And step three, after receiving the reconfiguration command from the reconfiguration module, the RRM controls the RBS to execute the reconfiguration command, and switches the service on the part of LTE authorized spectrum to the TVWS.
And step four, after receiving the reconfiguration command, the RBS performs reconfiguration in a specified time period according to the instruction of the RRM.
Step five: after the RBS completes the resource reallocation, the RRM in the RBS replies a reallocation completion message to the reallocation module to confirm that the reallocation is completed, and the reallocation module feeds back a reallocation result to the strategy control center.
Fig. 7 shows a GSM/UMTS system architecture for implementing the reallocation of spectrum resources by a primary system (e.g. a broadcast television system) according to the present invention, where, as shown in fig. 7, the RRM is located in the RBS, and the reallocation module is located in a network element on the network pipe side/core network side; the specific process of borrowing TVWS by the GSM/UMTS system shown in fig. 7 is similar to the process of borrowing TVWS by the LTE system shown in fig. 6, and the difference is that there is an independent BSC/RNC on the network side of the GSM/UMTS system, so that the BSC/RNC is mainly used for transparently transmitting messages between the reconfiguration module and the RBS/RRM in the process of borrowing TVWS.
Fig. 8 shows another structure of GSM/UMTS system for implementing the reallocation of spectrum resources of the primary system according to the present invention, where as shown in fig. 8, the RRM is located in the BSC/RNC, and the reallocation module is located in the network element at the network management side/core network side; the following describes the procedure of borrowing TVWS by GSM/UMTS system in detail with reference to fig. 8, and it should be understood that this procedure is different from the procedure of borrowing TVWS by GSM/UMTS system shown in fig. 7 because RRM shown in fig. 8 is located in BSC/RNC, and in this case, BSC/RNC does not only function as transparent transmission message.
Step one, a reconfiguration module collects information reported by a network side and receives frequency spectrum adjustment indication information issued by a strategy control center;
specifically, when the information reported by the network side indicates that the load of a certain current cell is severe, the reconfiguration module needs to determine whether to borrow the TVWS according to the TVWS usage information acquired at the policy control center; the method comprises the following steps that a strategy control center acquires the use condition information of a main system spectrum resource through information interaction with a database;
here, the TVWS usage information includes: unused spectrum states; specifically, the frequency point, the working bandwidth, the coverage, the possible duration, the allowed maximum transmission power, and the like may be used.
Step two, the reconfiguration module analyzes the received information, runs a reconfiguration algorithm and sends a reconfiguration command to the RRM in the BSC/RNC;
the reconfiguration command includes: TVWS frequency points, operating bandwidth, coverage, possible duration, maximum allowed transmit power, etc.
Step three, after receiving the reconfiguration command from the reconfiguration module, the RRM controls the RBS to execute the reconfiguration command, and switches the services on the authorized spectrum of part of the GSM/UMTS system to the TVWS.
And step four, after receiving the reconfiguration instruction, the RBS performs reconfiguration in a specified time period according to the instruction of the RRM.
And step five, after the RBS completes the resource reallocation, replying a reallocation completion message to the RRM in the BSC/RNC, forwarding the reallocation completion message to the reallocation module by the RRM to confirm the reallocation completion, and feeding back a reallocation result to the strategy control center by the reallocation module.
Fig. 9 shows a structure of a hybrid network of an LTE system and a GSM/UMTS system, in which the method for resource reallocation of a cognitive radio system of the present invention is implemented, and as shown in fig. 9, RBSs include RBSs of the LTE system and the GSM/UMTS system; for the LTE system, RRM is located in RBS, and for the GSM/UMTS system, RRM is located in BSC/RNC; the reconfiguration module is uniformly positioned at a network element at a network management side/core network side; the following describes in detail the process of implementing resource reconfiguration in the hybrid network of the LTE system and the GSM/UMTS system in accordance with the present invention with reference to fig. 9.
Step one, RRMs of respective systems monitor the operation conditions of respective networks, and report to a reconfiguration module when the conditions of more current services, heavy load and the like are monitored;
step two, the reconfiguration module operates a reconfiguration algorithm according to the acquired system information to obtain a reconfiguration command;
here, the information acquired by the reconfiguration module includes: spectrum usage information, load condition information, reconfiguration request information from each RBS, and spectrum adjustment instructions, idle spectrum resource information, etc. from a policy control center.
Step three, the reconfiguration module sends a reconfiguration command to a subordinate network element;
in this embodiment, all reconfiguration commands related to the reconfiguration of the LTE system are sent to the RBS corresponding to the LTE, the RRM in the RBS controls the LTE system network element to perform resource reconfiguration, and the BSC/RNC only plays a role in transparent transmission of these messages; all reconfiguration commands related to the reconfiguration of the GSM/UMTS system are sent to the RRM in the corresponding BSC/RNC, and the RRM controls the network element of the GSM/UMTS system to perform reconfiguration.
Furthermore, for example, when the GSM/UMTS system is reconfigured to be the LTE system, the reconfiguration is controlled by the RRM in the BSC/RNC, after the reconfiguration is completed, the RRM in the RBS of the LTE system acts, and only relevant system messages are transmitted to the RBS for the BSC/RNC corresponding to the RBS reconfigured to be the LTE system by the GSM/UMTS. If the LTE system is reconfigured into the GSM/UMTS system, after the reconfiguration is completed, the corresponding RBS is controlled by the RRM in the BSC/RNC, and the RRM in the RBS (LTE) does not work any more.
Fig. 10 shows the structure of a hybrid network of an LTE system and a GSM/UMTS system, in which the method for resource reallocation of a cognitive radio system of the present invention is implemented, and as shown in fig. 10, RBSs include RBSs of the LTE system and the GSM/UMTS system; for the LTE/GSM/UMTS system, the RRM is located in the RBS; the reconfiguration module is uniformly positioned at a network element at a network management side/core network side; the following describes in detail the process of implementing resource reconfiguration in the hybrid network of the LTE system and the GSM/UMTS system in accordance with the present invention with reference to fig. 10.
Step one, RRMs of respective systems monitor the operation conditions of respective networks, and report to a reconfiguration module when the conditions of more current services, heavy load and the like are monitored;
step two, the reconfiguration module operates a reconfiguration algorithm according to the acquired system information to obtain a reconfiguration command;
here, the information acquired by the reconfiguration module includes: spectrum usage information, load condition information, reconfiguration request information from each RBS, and spectrum adjustment instructions, idle spectrum resource information, etc. from a policy control center.
Step three, the reconfiguration module sends a reconfiguration command to a subordinate network element;
in this embodiment, all reconfiguration decisions are sent to the RRM in each RBS, and the RRM controls a network element associated with the system to perform resource reconfiguration.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (11)
1. A method for cognitive radio system resource reallocation, the method comprising:
the reconfiguration module located at the network side node operates a reconfiguration algorithm according to the received frequency spectrum adjustment instruction or the monitoring of the reconfiguration module on the network condition of each wireless communication system to obtain a reconfiguration command;
and sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
2. The method of claim 1, further comprising:
the strategy control center generates a spectrum adjustment instruction according to the network overall planning and time schedule of an operator or after obtaining available spectrum resources through information interaction with a database; wherein the indication of spectral modification comprises an indication of a readjustment of spectral resources, an addition of a radio access technology, RAT, or an enhancement of existing RAT functionality.
3. The method according to claim 1, wherein the reconfiguration module at the network side node runs the reconfiguration algorithm to obtain the reconfiguration command as:
a reconfiguration module located at a network management side or core network side node acquires a frequency spectrum adjustment instruction, frequency spectrum use condition information and load state information by carrying out information interaction with a strategy control center or monitoring the network condition of each wireless communication system;
and the reconfiguration module analyzes the acquired information and runs a reconfiguration algorithm to obtain a reconfiguration command.
4. The method according to claim 3, wherein the spectrum usage information is information of usage of licensed spectrum and borrowed spectrum of each wireless communication system, and usage of spectrum of primary system; the method specifically comprises the following steps: one or more of frequency point, working bandwidth, duration of idle frequency spectrum and emission parameter requirements;
the reconfiguration algorithm comprises the following steps: one or more of spectrum resource re-tuning, upgrading an existing RAT or placing a new RAT, adding multi-standard addition mode, radio resource optimization, secondary system to primary system spectrum borrowing.
5. The method of claim 1, wherein the sending the reconfiguration command to the base station, and the executing the reconfiguration command by the base station, implement resource reconfiguration as:
the reconfiguration module sends the reconfiguration command to a radio resource manager RRM;
and the RRM controls the base station to execute reconfiguration according to the received reconfiguration command.
6. The method of claim 5, wherein after the performing the reconfiguration command by the base station, the method further comprises:
after the reconfiguration is completed, the base station replies a reconfiguration completion message to the RRM;
the RRM forwards the received reconfiguration completion message to the reconfiguration module;
the reconfiguration module acquires the network side performance information of the base station after executing reconfiguration according to the reconfiguration command by monitoring the network condition of each wireless communication system, and performs reconfiguration adjustment according to the acquired information.
7. A system for resource reconfiguration of a cognitive radio system, comprising a base station, wherein the system further comprises: a reconfiguration module located at a network side node; wherein,
the reconfiguration module is used for operating a reconfiguration algorithm according to the received frequency spectrum adjustment instruction or monitoring the network state of each wireless communication system to obtain a reconfiguration command; and sending the reconfiguration command to a base station, and executing the reconfiguration command through the base station to realize resource reconfiguration.
8. The system of claim 7, further comprising: a database, a policy control center; wherein,
the database is used for providing the spectrum state information of the main system and the use information of the main system idle spectrum by the reconfiguration module;
the strategy control center is used for generating a spectrum adjustment instruction according to the network overall planning and time schedule of an operator or after obtaining available spectrum resources through information interaction with the database; wherein the indication of spectral modification comprises an indication of a readjustment of spectral resources, an addition of a radio access technology, RAT, or an enhancement of existing RAT functionality.
9. The system according to claim 7, wherein the reconfiguration module is located at a node on a network management side or a core network side, and is specifically configured to perform information interaction with the policy control center to obtain a spectrum adjustment instruction, or obtain spectrum usage information and load status information by monitoring network conditions of each wireless communication system; running a reconfiguration algorithm according to the acquired information to obtain a reconfiguration command;
the frequency spectrum use condition information is information of the use condition of each wireless communication system to the self authorized frequency spectrum and the borrowed frequency spectrum and the use condition of the frequency spectrum of the main system; the method specifically comprises the following steps: one or more of frequency point, working bandwidth, duration of idle frequency spectrum and emission parameter requirements;
the reconfiguration algorithm comprises the following steps: one or more of spectrum resource re-tuning, upgrading an existing RAT or placing a new RAT, adding multi-standard addition mode, radio resource optimization, secondary system to primary system spectrum borrowing.
10. The system of claim 7, further comprising: RRM; wherein,
the reconfiguration module is further configured to send the reconfiguration command to the RRM;
and the RRM is used for controlling the base station to execute reconfiguration according to the received reconfiguration command.
11. The system according to claim 10, wherein said base station is a reconfigurable base station, RBS, for replying a reconfiguration complete message to said RRM after reconfiguration is complete;
the RRM is further configured to forward the received reconfiguration complete message to the reconfiguration module;
the reconfiguration module is further configured to acquire, through monitoring network conditions of each wireless communication system, network side performance information after the base station performs reconfiguration according to the reconfiguration command, and perform reconfiguration adjustment according to the acquired information.
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| CN2011101824202A CN102857973A (en) | 2011-06-30 | 2011-06-30 | Method and system for reconfiguring resources of cognitive radio system |
| PCT/CN2012/074202 WO2013000320A1 (en) | 2011-06-30 | 2012-04-17 | Method and system for reallocating cognitive radio system resource |
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