KR20080095028A - Method of calculating reference value for managing crrm in multi-radio network and appratus thereof - Google Patents

Abstract

A CRRM(Common Radio Resource Manager)-led network selection method in a multi-wireless network and a device therefor are provided to enable a CRRM to determine traffic readjustment according to defined policies and to suggest the determined results to a mobile terminal, thereby efficiently providing radio resources between different networks. A CRRM collects each piece of network-related information in a multi-wireless network consisting of at least two different networks, and generates a reference value(S310,S320). The CRRM determines one network of the wireless network in order to change a network of the mobile terminal which is currently connected, based on the reference value(S330). The CRRM transmits information on the determination to the terminal, so that the terminal is connected to the determined network(S340,S350).

Description

Method and apparatus for selecting CRRM-driven network in multiple wireless networks {METHOD OF CALCULATING REFERENCE VALUE FOR MANAGING CRRM IN MULTI-RADIO NETWORK AND APPRATUS THEREOF}

1 illustrates an example of a multiple wireless network including a CRRM according to an embodiment of the present invention.

FIG. 2 is a schematic internal block diagram of the CRRM of FIG. 1.

3 is a flowchart illustrating a method of selecting an access to a predetermined network for CRRM operation according to an embodiment of the present invention.

4 and 5 illustrate cells in which CRRM is set as a traffic redistribution target according to an embodiment of the present invention.

The present invention relates to a mobile communication system, and more particularly to multi-radio networks including wireless access networks such as CDMA 1x, CDMA 1x EV-DO, WCDMA, HSDPA, 802.16e. The present invention relates to a CRRM-driven network selection method and apparatus in a multi-radio network that makes a decision on which network a mobile terminal enters under CRRM-driven.

In various wireless network environments, heterogeneous networks such as CDMA 1x EV-DO, HSDPA, 802.16e, and WLAN coexist or are integrated in a structure in which single networks such as CDMA 1x, WCDMA, and GSM independently provide services. It is changing in the form of a multi-radio environment. At present, there is a need to provide a service that seamlessly manages radio resources of heterogeneous networks to provide seamless services and various services to users.

In order to solve this demand, a model for managing radio network resources between heterogeneous networks by configuring signal interfaces between heterogeneous networks has been proposed. However, this lacks the global information, which reduces the optimality of the entire network, and results in a decrease in network performance due to a lot of overhead traffic required during the negotiation process. It also implies the possibility of import. In addition, such a network management model is difficult to modify the system according to the continuous introduction and upgrade of the system has a problem that the scalability is weak.

First, even in heterogeneous converged networks, solutions to traditional radio resource management (RRM) problems such as Call Admission Control (CAC), Load Control (LC), Handover Control (HC), and Power Control (PC) are obviously 1 It will be a primary concern. However, in the heterogeneous converged network environment instead of a single network, since there are networks composed of multiple protocols and systems, each of the above problems is difficult to solve, and the procedure for making a decision on each problem is also important. It's a problem.

The current method of CRRM suggests that if the CRRM obtains a common comparison parameter generated based on the measurement values received from each network, the common comparison parameters, i.e. based on the information already established in the CRRM and the policy set by the network operator, The virtual price is used to determine which networks require redistribution between networks, or to be used in access selection.

However, a study on decision making on the execution of radio resource management functions (RRM functions) in a multi-network network using the reference value, which is a common comparison parameter, has been realized by considering too many parameters for different resources of each network. There has been a problem of falling, and difficult to provide in real time.

In addition, there is a tendency to solve only a specific issue in the whole issue, which does not fully reflect all the conditions such as service category, traffic, and user priority of the network, and does not consider the optimization technique and policy / rule / profile, and thus inefficiency. Cause problems.

The present invention has been made in view of the above circumstances, and an object of the present invention is to collectively use a reference value generated based on information received from each network by a CRRM having a final decision on traffic redistribution in multiple wireless networks. In order to provide a method and apparatus for CRRM-driven network selection in a multi-radio network that efficiently provides radio resources between heterogeneous networks by providing a method for delivering traffic redistribution to mobile terminals after making a decision on traffic redistribution have.

The present invention has been made in view of the above circumstances, and another object of the present invention is to compare traffic amount between networks using a CRRM based on a reference value, determine the traffic rebalancing according to a policy set by CRRM, and determine the result. The present invention provides a method and apparatus for CRRM-driven network selection in a multi-radio network that efficiently provides radio resources between heterogeneous networks.

The present invention was created in view of the above circumstances, and another object of the present invention is to select a target network to participate in traffic rebalancing among networks belonging to multiple networks by CRRM using a reference value, and the result is determined by the mobile terminal or the local. The present invention provides a method and apparatus for CRRM-driven network selection in a multi-radio network that efficiently transmits radio resources between heterogeneous networks by transmitting through RRM to redistribute traffic.

CRRM-driven network selection method in a multiple wireless network according to the first aspect of the present invention for achieving the above object,

a) a common radio resource manager (CRRM) collecting reference information for each network in a multi-radio network composed of at least two different networks to generate a reference value; b) determining, by the CRRM, one of the multiple wireless networks to change the network of the mobile terminal that is currently connected based on the reference value; And c) the CRRM sending information on the determination to the mobile terminal to instruct the mobile terminal to connect to the determined network.

In order to achieve the above object, a CRRM-driven network selection method in a multi-radio network according to the second aspect of the present invention,

Iii) generating a reference value by collecting each network related information in a multiple radio network composed of at least two different networks by a common radio resource manager (CRRM); Ii) converting the amount of traffic in the network or cell to be redistributed based on the reference value; And iii) redistributing the traffic such that the amount of traffic in the network or cell is equal to Equation (1).

f _i (new_cell_load _i , cell_capacity) = f _j (new_cell_load _j , cell_capacity _j )

CRRM-driven network selection method in a multiple wireless network according to a third aspect of the present invention for achieving the above object,

I) generating a reference value by collecting each network-related information in a multiple radio network composed of at least two different networks by a common radio resource manager (CRRM); Converting the amount of traffic in the network or cell to be redistributed based on the reference value; III) calculating an amount of difference (μ) of traffic between the network or the cells; And IV) redistributing the traffic by comparing the difference amount μ of the traffic with the minimum amount of traffic lambda set in the network or cell.

In order to achieve the above object, a CRRM-driven network selection method in a multiple wireless network according to a fourth aspect of the present invention is provided.

A) generating, by a common radio resource manager (CRRM), a reference value by collecting information about each network in a multi-radio network composed of at least two different networks; B) the CRRM transmitting the reference value to a local Radio Resource Manager (RRM) that manages the network; C) determining, by the local RRM, one of the multiple wireless networks to change the network of the mobile terminal currently connected based on the reference value; And d) instructing the local RRM to transmit the information on the determination to the mobile terminal to connect the mobile terminal to one of the determined multiple wireless networks.

The common radio resource operating apparatus in a multiple radio network according to the fifth aspect of the present invention for achieving the above object,

An individual network information management module for collecting each network related information in a multi-radio network composed of at least two different networks; A control module generating a reference value based on the network related information and generating and managing policy information on traffic redistribution; And a decision module for determining a target network for traffic redistribution based on the reference value or the policy information and transmitting information on the determination to the mobile terminal to instruct the mobile terminal to access the determined network. do.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

As shown in FIG. 1, a common radio resource manager 100 (hereinafter referred to as CRRM) is a wireless access network (CDMA 1x, CDMA 1x EV-DO, WCDMA, HSDPA, and 802.16e). Wireless access networks are connected to multiple wireless networks composed of at least two different networks.

2 is a schematic internal block diagram of the CRRM 100 of FIG.

The CRRM 100 includes an individual network information management module 130 for collecting each network related information in a multi-radio network composed of at least two different networks; A control module 160 generating a reference value based on the network related information and generating and managing policy information on traffic redistribution; And a decision module 170 for determining a target network for traffic redistribution based on the reference value or the policy information and transmitting information on the determination to the mobile terminal to instruct the mobile terminal to access the determined network. It is configured to include).

In addition, the CRRM 100 further includes a local Radio Resource Manager (RMM) module 120 that manages information on the local RRM so that an indication of traffic redistribution determined by the decision module may be transmitted to the local RRM. It is configured by.

The control module 160 calculates the difference amount of traffic (μ) between the network or the cells and compares the difference amount (μ) of the traffic with the minimum amount of traffic (λ) set in the network or the cell. Determine whether to redistribute.

In one application, the control module 160 converts the amount of traffic in the network or cell to be redistributed based on the reference value, and redistributes the traffic such that the amount of traffic in the network or cell is equal to Equation (2). To decide.

f _i (new_cell_load _i , cell_capacity) = f _j (new_cell_load _j , cell_capacity _j )

An operating state of the present invention configured as described above will be described with reference to FIG.

The CRRM 100 collects each network related information in a multiple wireless network composed of the different networks (S310).

The CRRM 100 generates a reference value based on the network related information (S320).

In other words, the CRRM 100 generates a reference value by the CRRM 100 based on information such as load or capacity of the network or cell received from each network, and information on QoS settings and policies of the CRRM 100. do. The CRRM 100 expresses the basic determination of the total traffic redistribution of the current multiple network network through a reference value suggested by the present invention.

The CRRM 100, which has the final decision on the movement of traffic, enters or moves each mobile terminal to the determined network (or cell) with reference to the determination.

As in the embodiment of the present invention, when the CRRM 100 itself is the final decision maker of the traffic redistribution, the CRRM 100 does not transmit the reference value to another object, that is, the mobile terminal, in a batch in the CRRM 100. After making the final decision, only the mobile direction of the mobile terminal is transmitted to the mobile terminal belonging to the local RRM or the network targeted for traffic redistribution.

The mobile terminal, which has received the mobility guide, performs a handover or access operation to another network, and through this process, the resources of the entire multiple networks connected to the CRRM are maintained.

CRRM (100) proposed in the present invention is connected to each CN (Core Network) of CDMA 1x, CDMA 1x EV-DO, WCDMA, HSDPA, 802.16e, CRRM and each through an interface / interpreter inside the CRRM Communicate with the network.

That is, a target network setting condition for setting a first access to the CRRM 100 by the mobile terminal among the multiple wireless networks is set.

When the mobile terminal accesses the network according to the target network setting condition, the other network of the mobile terminal in the CRRM 100 according to at least one of the comparison result and the CRRM policy compared with the reference value. Whether to access the network, that is, to redistribute the traffic (S330)

The CRRM 100 determines whether to redistribute the traffic, and when the traffic redistribution target is determined, instructs the traffic redistribution to a mobile terminal belonging to the network that is the traffic redistribution target or a local radio resource manager (RRM) managing the network. (S340).

The local RRM received the instruction instructs the traffic redistribution to the mobile terminal belonging to the network managed by the local RRM so that the mobile terminal attempts to connect to another network and redistributes traffic from the CRMM 100 directly to the mobile terminal. Instructing the mobile terminal to try to connect to the other network (S350).

Hereinafter, an embodiment of redistributing traffic using a reference value will be described in more detail.

[First Embodiment]

The first embodiment describes a method of determining a target network or cell to participate in traffic redistribution in CRRM.

In a first application, the CRRM 100 sets all networks or all cells to be the target of all traffic redistribution and collects respective reference values from all the networks or all cells.

4 and 5 illustrate an example in which the CRRM 100 sets cells as traffic redistribution targets, and this case is described as an example, but the example is not limited thereto.

The CRRM 100 sets all cells as targets of traffic redistribution every unit time. Assuming that the number of cells is n and a reference value assigned to the i-th cell is vpi, the list of reference values is as follows.

VP = (vp1, vp2, ..., vpn).

The traffic movement amount determined in each cell is a sum of the result of subtracting the reference value of the cell from the reference value of adjacent or connected cells. Thus, if this value is not zero, it means that the cell must rebalance traffic with any other cell.

For example, as shown in FIG. 4, when five cells are connected to each other, at the present time point t = 0, the CRRM (100) is a reference value list VP (0) = (10, 3, 7, 5 , 4)

If so, the CRRM 100 transmits the traffic corresponding to the reference value (10-3) λ = 7λ from cell 1 to cell 2 and the reference value ((10-5) + (4-) from cell 1 to cell 4. 5)) λ = 4λ traffic from cell 1 to cell 5 as reference value ((10-4) + (5-4) + (7-4)) λ = 10λ Make a decision to move traffic. Λ is a reference value corresponding to traffic to be moved for a unit time.

The list of calculated reference values that the CRRM 100 receives from each of the networks is VP (1) = (10-21λ, 3 + 7λ, 7, 5 + 4λ, 4 + 10λ), as shown in FIG. Becomes

By using the above-described method, all neighboring cells participate in traffic redistribution at the same time for every unit time, so that load balancing among all cells can be corrected quickly.

In the second application example, the CRRM 100 compares the difference between the reference values between neighboring cells in order to set two specific cells as targets of traffic redistribution every unit time, and the largest difference between the reference values is ( max gradient) Two neighboring cells are selected and the traffic redistribution target is changed to change traffic between the two cells.

That is, based on the reference value assigned to each cell, the gradient of the reference value between two cells is calculated as follows.

i-th cell and j-th cell are adjacent: g _ij = vp _i -vp _j

Otherwise: g _ij = 0

The CRRM 100 makes a decision to move the traffic only for neighboring cells of i, j selected as above for the given unit time at the largest gradient of the difference between the reference values at g _ij .

In the second application example, a case in which the CRRM 100 calculates a difference of reference values between cells to redistribute traffic has been described, but it is also possible to redistribute traffic by calculating a difference of reference values between adjacent networks.

Second Embodiment

An application example of the second embodiment describes a method of determining the amount of traffic to perform traffic from a CRRM to a network or cell participating in traffic redistribution.

In one application example, the CRRM 100 determines the amount of traffic to be distributed in advance based on experimental data so that if the difference between the reference values of cells _i and _j exceeds a predetermined value, Redistribute.

In another application example of the second embodiment, the amount of traffic to be distributed is converted based on the calculated reference value.

That is, the traffic is distributed so that the reference value of the new cell load obtained by the calculation coincides with Equation 3 below. At this time, the reference values between neighboring cells are made equal so that the balance of the entire network can be naturally maintained.

f _i (new_cell_load _i , cell_capacity) = f _j (new_cell_load _j , cell_capacity _j )

In another application example of the second embodiment, the method of the two application examples described above is compromised to determine a predetermined minimum amount of traffic (= λ), and the smaller value of the amount of traffic (= μ) obtained by the reference value difference. Select to distribute the traffic.

That is, the amount of traffic to move = min (λ, μ)

After selecting a target network or target cell to conduct traffic between networks or between cells using the method as described above, and determining the amount of traffic, the CRRM directly transfers the determined items to the mobile terminal belonging to the target network or target cell. By transmitting the determined matters to the local RRM (Radio Resource Manager) that manages the target network or the target cell, the redistribution of traffic is performed by notifying the determined matters to the target mobile terminal in the local RRM.

It will be described in more detail below.

Referring to FIG. 1, since the CRRM 100 is located in a core network (CN) and has all interfaces for each network, the CRRM 100 transmits and receives data with all networks belonging to multiple networks. Accordingly, the CRRM 100 directly commands the mobile terminal belonging to the network or cell selected by the CRRM for traffic distribution based on the matters determined in the above-described first and second embodiments.

 That is, the CRRM directly manages the vertical handover and the horizontal handover of each mobile terminal, so that the resource utilization state of each cell can be maintained so as not to exceed a predetermined line (that is, not to become an overload situation).

Secondly, when the CRRM makes a decision to each local RRM, the local RRM of each network should select the corresponding mobile terminals and handover to another network or another cell. In this case, the CRRM load can be reduced by distributing the CRRM role to each log RRM.

Third, the CRRM 100 transmits a reference value of each network or cells calculated by the CRRM 100 to a local RRM included in each network. Then, the local RRM compares its reference value with the reference value of each network, selects cells that need traffic distribution, and gives a handover command to mobile terminals belonging to these cells.

As described in detail above, according to the CRRM-driven network selection method and apparatus in the multi-radio network of the present invention, traffic redistribution in an environment in which CRRM is managed to manage networks previously managed individually as one integrated network A radio resource management function such as (hand over) or access selection may be performed.

In addition, by comparing the common parameters between the network or the cell required in the process of performing a radio resource management function such as traffic redistribution (handover) or access selection, based on the result, the network side, that is, CRRM makes a decision There is an effect that can quickly solve the imbalance of the load.

In addition, when CRRM directly commands mobile terminals belonging to a network or cell selected for traffic distribution, mobile terminals are directly managed by CRRM, thereby bringing more flexibility in load balancing of the entire network. have.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

Claims (20)

a) generating a reference value by collecting each network-related information in a multi-radio network composed of at least two different networks by a common radio resource manager (CRRM); b) determining, by the CRRM, one of the multiple wireless networks to change the network of the mobile terminal that is currently connected based on the reference value; And c) the CRRM transmitting information on the determination to the mobile terminal to instruct the mobile terminal to connect to the determined network. The method of claim 1, wherein in step b), b-1) setting, by the CRRM, all networks to be redistributed to the traffic and assigning corresponding reference values to each network; And b-2) determining the movement amount of the traffic determined in the first network among all the networks as a sum of a difference between a reference value of networks adjacent to the first network and a difference with the reference value of the first network. CRRM-driven network selection method in a multiple wireless network, characterized in that. The method of claim 1, wherein in step b), Comparing, by the CRRM, a difference in reference values between neighboring networks in all the networks; Selecting two neighboring networks having the largest difference between the reference values and setting them as targets for redistribution of traffic; And CRRM-driven network selection method in a multi-radio network comprising the step of changing the traffic between the two networks. The method according to any one of claims 1 to 3, wherein in step c), And commanding a handover or an access connection to a predetermined network to a mobile terminal belonging to a network selected for redistribution of traffic by the CRRM. The method according to any one of claims 1 to 3, wherein step c) Transmitting, by the CRRM, a list of mobile terminals belonging to the traffic redistribution target to a local RRM of a network selected for traffic redistribution; And And instructing a handover or an access connection to a predetermined network from the local RRM to a mobile terminal belonging to the list. The method of claim 1, wherein in step b), b-iii) the CRRM sets all cells (cells) to be redistributed to the traffic and gives each cell a corresponding reference value; And b-ii) the movement amount of the traffic determined in the first cell of all the cells is determined by the sum of the difference between the reference value of the cells adjacent to the first cell and the reference value of the first cell. CRRM-Driven Network Selection Method in Multiple Wireless Networks The method of claim 1, wherein in step b), Comparing, by the CRRM, a difference in reference values between neighboring cells in all the cells; And And if the difference of the reference value exceeds a predetermined value, the CRRM changing the traffic by a predetermined amount. The method of claim 6 or 7, wherein the step c) And commanding a handover or an access connection to a predetermined network to a mobile terminal belonging to a network selected for redistribution of traffic by the CRRM. The method of claim 6 or 7, wherein the step c) Transmitting, by the CRRM, a list of mobile terminals belonging to the traffic redistribution target to a local RRM of a network selected for traffic redistribution; And And instructing a handover or an access connection to a predetermined network from the local RRM to a mobile terminal belonging to the list. Iii) generating a reference value by collecting each network related information in a multiple radio network composed of at least two different networks by a common radio resource manager (CRRM); Ii) converting the amount of traffic in the network or cell to be redistributed based on the reference value; And Iii) redistributing the traffic such that the traffic amount in the network or cell is equal to Equation (4). f _i (new_cell_load _i , cell_capacity) = f _j (new_cell_load _j , cell_capacity _j ) I) generating a reference value by collecting each network-related information in a multiple radio network composed of at least two different networks by a common radio resource manager (CRRM); Converting the amount of traffic in the network or cell to be redistributed based on the reference value; III) calculating an amount of difference (μ) of traffic between the network or the cells; And And iv) redistributing the traffic by comparing the difference amount (μ) of the traffic with the minimum amount of traffic (λ) set in the network or the cell. The method of claim 11, wherein in step IV), As a result of comparing the difference (μ) of the traffic and the minimum amount of traffic (λ) set in the network or the cell, a smaller value is selected to redistribute the traffic. How to choose. 13. The method of claim 11 or 12, wherein the network or cells of step III) are adjacent networks or adjacent cells. The method of claim 13, wherein in step IV), And redistributing the traffic by instructing a handover or an access connection to a predetermined network to a mobile terminal belonging to a network selected for redistribution of traffic. The method of claim 13, wherein step IV) Transmitting, by the CRRM, a list of mobile terminals belonging to the traffic redistribution target to a local RRM of a network selected for traffic redistribution; And And instructing a handover or an access connection to a predetermined network from the local RRM to a mobile terminal belonging to the list. A) generating, by a common radio resource manager (CRRM), a reference value by collecting information about each network in a multi-radio network composed of at least two different networks; B) the CRRM transmitting the reference value to a local Radio Resource Manager (RRM) that manages the network; C) determining, by the local RRM, one of the multiple wireless networks to change the network of the mobile terminal currently connected based on the reference value; And D) instructing the local RRM to transmit the information on the determination to the mobile terminal to instruct the mobile terminal to connect to one of the determined multiple wireless networks; How to choose your network. An individual network information management module for collecting each network related information in a multi-radio network composed of at least two different networks; A control module generating a reference value based on the network related information and generating and managing policy information on traffic redistribution; And And a decision module for determining a target network for traffic redistribution based on the reference value or the policy information, and transmitting information on the determination to the mobile terminal to instruct the mobile terminal to access the determined network. A common radio resource operating device in a multiple radio network, characterized in that. The method of claim 17, wherein the device, And a local radio resource manager (RMM) module for managing information on the local RRM so that an indication of traffic redistribution determined by the decision module can be transmitted to the local RRM. Resource operating device. The method of claim 17 or 18, wherein the control module, Compute the difference (μ) of traffic between the network or the cells, and compares the difference (μ) of the traffic and the minimum amount of traffic (λ) set in the network or cell to determine whether to redistribute the traffic Common radio resource operating apparatus in a multi-radio network. The method of claim 17 or 18, wherein the control module, Converting the amount of traffic in the network or cell to be redistributed based on the reference value, and determining to redistribute the traffic so that the amount of traffic in the network or cell is equal to the equation (5) Radio resource operating device. f _i (new_cell_load _i , cell_capacity) = f _j (new_cell_load _j , cell_capacity _j )

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