KR100907998B1 - Method and apparatus for calculating reference value for Crm operation in multiple wireless networks - Google Patents

Abstract

Disclosed are a method and apparatus for calculating reference values for CRRM operation in multiple wireless networks. The present invention provides a method comprising: a) collecting, by a common radio resource manager (CRRM), network-related information in a multi-radio network composed of at least two different networks; b) generating a reference value based on the network related information in the CRRM; c) generating a network list by prioritizing the networks for the mobile terminal to access the heterogeneous network using the reference value; d) determining whether the mobile terminal has access to the heterogeneous network and the heterogeneous network to which the mobile terminal has access based on the reference value.

Multi-network, CRRM, radio resources, network selection, baseline, marginal coast

Description

METHODS AND APPARATUS OF CALCULATING REFERENCE VALUE FOR MANAGING CRRM IN MULTI-RADIO NETWORK}

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 generating a reference value for CRRM operation 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 method and apparatus for calculating a reference value for CRRM operation in a multi-radio network in which a mobile terminal determines which network to enter under the operation of a common radio resource manager (CRRM).

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 is a disadvantage that the overall network (optimality) is degraded because of lack of global information, and the performance of the network is degraded due to a lot of overhead traffic during the negotiation process It also implies the possibility of importing. 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 integrated network environment rather than a single network, each of the above problems is very difficult to solve.

 As a result of investigating the problems of the concepts presented by the integrated network CRRM (Common Radio Resource Manager), researches to find common parameters that can be represented as comparison parameters of each network have been conducted in various places. There is no situation. In addition, the problems of the existing studies do not fully reflect the conditions such as QoS category, traffic, and user priority, and do not fully reflect the difficulties of CRRM due to the application of optimization techniques and policy / rule / profile in a multi-network environment. Also, unlike the reality, since all variables and parameters are assumed to be static (static) with time, there has been a problem of being unrealistic.

The present invention has been made in view of the above circumstances, and an object of the present invention is to compare and analyze concepts currently proposed to operate multiple wireless networks, to find common parameters that can be represented as comparison parameters between heterogeneous networks, and The present invention provides a method and apparatus for calculating a reference value for CRRM operation in a multi-radio network that receives common parameters from heterogeneous networks, generates reference values, and efficiently provides radio resources between heterogeneous networks.

The present invention has been made in view of the above-described circumstances, and another object of the present invention is that the CRRM (Common Radio Resource Manager) obtains load information of each network from heterogeneous networks, and thus the log information and capacity of each network. The present invention provides a method and apparatus for calculating a reference value for CRRM operation in a multi-radio network that generates reference values based on information and efficiently provides radio resources between heterogeneous networks using the information.

The present invention has been made in view of the above circumstances, and another object of the present invention is to provide a radio resource between heterogeneous networks efficiently by using reference values generated in CRRM and information of respective networks received in real time. The present invention provides a method and apparatus for calculating a reference value for CRRM operation in a network.

Reference value calculation method for CRRM operation in a multiple radio network according to the first aspect of the present invention for achieving the above object,

a) a common radio resource manager (CRRM) collecting information related to each network in a multi-radio network composed of at least two different networks;

b) generating a reference value based on the network related information in the CRRM;

c) generating a network list by prioritizing the networks for the mobile terminal to access the heterogeneous network using the reference value; And

d) determining whether the mobile terminal has access to the heterogeneous network and the heterogeneous network to which the mobile terminal has access based on the reference value.

Reference value calculation method for CRRM operation in a multi-radio network according to a second aspect of the present invention for achieving the above object,

Iii) collecting each network related information in a multiple radio network composed of at least two different heterogeneous networks by a common radio resource manager (CRRM);

Ii) generating a reference value based on the network related information in the CRRM;

Iii) determine a priority for the mobile terminal currently connected to a predetermined network based on the reference value and the network-related information received in real time to perform access to one of the predetermined network and the heterogeneous networks, and generate a network list. Generating; And

Iii) determining whether to access one of the heterogeneous networks for the mobile terminal based on the reference value and the different networks and the heterogeneous network to which the mobile terminal will access.

The common radio resource management apparatus in the multiple radio network according to the third 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 configured to generate a reference value based on the network related information, and to prioritize the networks to be redistributed by using the reference value to generate a network list; And

And a decision module for determining whether to access the heterogeneous network to the mobile terminal based on the reference value, and the heterogeneous network to be accessed by the mobile terminal.

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 such as CDMA 1x, CDMA 1x EV-DO, WCDMA, HSDPA, and 802.16e. access networks) and are connected to multiple radio networks consisting of at least two different networks.

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

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) for generating a reference value based on the network-related information, and for generating a network list by prioritizing networks to be redistributed by using the reference value; And a decision module 170 that determines whether the mobile terminal accesses the heterogeneous network based on the reference value, and determines the heterogeneous network that the mobile terminal will access.

The control module 160 generates the network list based on the reference value and the network related information provided from the individual network information management module 130 in real time, and the decision module 170 determines the reference. The heterogeneous network is determined based on the value and the network related information.

In other words, the individual network information management module 130 receives a load value corresponding to each of an uplink and a downlink from the heterogeneous networks, or the heterogeneous networks are connected to the uplink and downlink. The load value of the downlink is converted into a percentage and then compared to receive a load value with the higher percentage.

In addition, the decision module 170 determines the access of the heterogeneous network when the load value is compared with the reference value and exceeds the reference value.

The operating state of the present invention configured as described above will be described.

The radio access networks as described above provide information required by the CRRM 100 at the CRRM and a reporting time determined between the networks. That is, the CRRM 100 collects each network related information in a multiple wireless network composed of different networks (S310).

The CRRM 100 generates a reference value (Virtual Price) that is a common comparison target for networks having different capacities and load states based on the network-related information (S320).

Each network diagram introduces the concept of a reference value as a common unit for comparing a network marginal cost (Marginal cost) generated for the additional load of various kinds of radio resources in each cell. However, since the introduction of the concept of a reference value is for a policy for utilizing a radio resource, a reference value concept considering the network preference information, QoS information, etc. of a network operator or a subscriber is introduced in order to compare each network or cell. Used as a parameter. The tool for calculating these reference values is called Marginal Cost Function.

In addition, the CRRM designs a Marginal Cost Function for each network (or cell) or each QoS based on information on resources or policies received from each network and calculates a reference value.

Instead of the Marginal cost concept proposed in the present invention, the Marginal utility concept can be used to calculate the reference value. This is because marginal cost and marginal utility are inversely related to each other, so one of them can be mapped to the other.

In order to explain an embodiment of the present invention, as shown in Table 1 below, loads in uplink and downlink and corresponding capacities for five wireless networks are set. As one of the CRRM policies, the network operator's preference for the network is taken as an example.

Network characteristics (one example) (GWU consult needed) CDMA 1x CDMA 1x EV-DO Rev. A WCDMA HSDPA 802.16e (Wibro) Uplink Max. Capacity (diverse formats) 1.0 dB (interference) 1.0 dB (interference) 1.0 dB (interference) 50 (num of users) 70 (num of users) Downlink Max. Capacity (total throughput) 256 Kbps 3.1 Mbps 384 Kbps 14.4 Mbps 46 Mbps

In addition, in the embodiment of the present invention, for the sake of clarity, it is assumed that five networks each include only one cell and are located at the same geographical location. In other words, it is assumed that the mobile terminal can perform vertical handover and no horizontal handover as long as it has hardware capability. Each Cell is composed as follows.

(GWU consult needed) Cell # One 2 3 4 5 Network CDMA 1x CDMA 1x EV-DO WCDMA HSDPA 802.16e (Wibro) Current status of uplink / downlink load 0.4 dB / 128 Kbps 0.2 dB / 0.93 Mbps 0.4 dB / 172.8 Kbps 20 / 7.2 Mbps 42 / 32.2 Mbps

An example of the policy definition and network preferences of the network operator defined in the CRRM is as follows. That is, the network preference for the data service follows the following order.

Network Preference: HSDPA> 802.16e> CDMA 1x EV-DO> WCDMA> CDMA 1x

In addition, the network preference for the voice service is as follows (CDMA 1x EV-DO, HSDPA, 802.16e uses VoIP).

Network Preference: CDMA 1x> WCDMA> HSDPA> 802.16e> CDMA 1x EV-DO

The CRRM obtains load information from each network as described above. In this case, since the loads of the uplink and the downlink of each network are treated differently, first, the load amount of the uplink and the downlink is converted into a percentage (%), respectively, and the larger value of the converted values is referred to as a reference value. In this case, the second uplink and downlink loads are averaged and the value is transmitted to the CRRM as a reference value. Finally, it is also possible to send both loads of uplink and downlink respectively to determine which one to use in the CRRM.

The reference value is calculated based on the information received from each network. In the embodiment of the present invention, for the sake of brevity of description, the Marginal Cost Function is defined in the form of a linear function of load / capacity. It is also possible to use other kinds of functions for load / capacity.

In practice, the reference value can be converted as follows based on the values presented as examples above. (Where a = 1, b = 0 and the higher of the uplink and downlink).

Cell # One 2 3 4 5 Current status of load% (up / down) 40/50 20/30 40/45 40/50 60/70 Reference value 0.5 0.3 0.45 0.5 0.7

In CRRM, the priority list for the handover is constructed using only the reference value (basically, the one with the lower reference value takes precedence over the higher one), or the network value is created by priority after sorting the reference values by additionally reflecting the CRRM policy. The network list corresponds to the result of decision-making in CRRM. An example of the network list is as follows.

That is, an example of the first network list generated using only the reference value is as follows.

1st rank: # 2, # 3

2nd rank: # 1, # 4

3rd rank: # 5

An example of the second network list generated by using both the reference value and the CRRM policy is as follows.

1st rank: # 2, # 4

2nd rank: # 1, # 3

3rd rank: # 5

Network List 1 is based only on reference values, and thus corresponds to the resource utilization (occupancy) ranking of each network. Meanwhile, the second network list additionally reflects the policy of CRRM. Since the network preference policy of the network operator reflects the policy of driving more traffic toward HSDPA, the order of ranking of the network list is changed.

When the policy is reflected as in the second network list, a method of indirectly changing the reference value by weighting the reference value may be applied, or may be directly applied to the network list as in the present embodiment. This method difference may be freely determined and used by network operators.

Based on the results of CRRM, CRRM decides what action to take for load balancing policy or CRRM policy for all connected networks, and decision-making result is passed through each local RRM or local RRM (bypass). And delivered to the mobile terminal so that the local RRM or mobile terminal performs the above operation in accordance with the determination.

In other words, according to the CRRM decision, redistribution of traffic occurs from low priority (high resource utilization) to high (low resource utilization), ultimately distributing the network load. It can be reliably managed.

Finally, depending on the outcome of the network selection, the network and the mobile terminal may use the CRRM unless there is a specific reason that the mobile terminal should handover to another network or attempt to enter a particular network, which is not physically possible. You should try to connect to the network according to the list of networks (participated in traffic redistribution) determined by.

If you fail in the first rank when selecting access to the network, go to the second and third ranks and try again.

By using the above-described method, a target network setting condition in which the mobile terminal attempts to connect to the CRRM 100 for the first time among the multiple wireless networks, and determining whether to access another network from the network to which the mobile terminal is connected The subject to be performed and the time point are set (S330).

When the mobile terminal accesses the network according to the target network setting condition, it is determined whether the mobile terminal accesses the other network according to at least one of the comparison result compared with the reference value and the policy of the CRRM. S340, S350).

As described above in detail, according to the method and apparatus for calculating a reference value for CRRM operation in a multi-radio network according to the present invention, a multi-network (based on the concept of managing the previously managed networks as one integrated network) By providing a reference value of network access selection in a multi-radio networks environment, an improved network management scheme and scalability of the network can be improved from a multi-network manager's point of view.

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 (14)

a) a common radio resource manager (CRRM) collecting information related to each network in a multi-radio network composed of at least two different networks; b) generating a reference value based on the network related information in the CRRM; c) generating a network list by prioritizing the networks for the mobile terminal to access the heterogeneous network using the reference value; And d) determining whether to access the heterogeneous network to the mobile terminal based on the reference value, and determining the heterogeneous network to be accessed by the mobile terminal, Step b), b-1) receiving, by the CRRM, a load value corresponding to each of an uplink and a downlink from the heterogeneous networks; And b-2) generating a reference value by comparing the load value with respective capacities of the heterogeneous networks. According to claim 1, wherein step b-2), A reference value calculation method for CRRM operation in a multiple wireless network, characterized in that for generating a reference value by dividing each load value of the heterogeneous networks by a capacity value. The method of claim 2, wherein in step b-1), The heterogeneous networks compare the load values of the uplink and the downlink by a percentage (%), and then transmit a load value having a higher percentage to the CRRM. Way. The method of claim 3, wherein in step b-1), The heterogeneous networks transmit a load value of the uplink and downlink to the CRRM, respectively. delete Iii) collecting each network related information in a multiple radio network composed of at least two different heterogeneous networks by a common radio resource manager (CRRM); Ii) generating a reference value based on the network related information in the CRRM; Iii) determine a priority for the mobile terminal currently connected to a predetermined network based on the reference value and the network-related information received in real time to perform access to one of the predetermined network and the heterogeneous networks, and generate a network list. Generating; And Iii) determining whether to access one of the heterogeneous networks for the mobile terminal based on the reference value and the different networks and the heterogeneous network to which the mobile terminal will access; In step iii) above, The method of calculating a reference value for operating a CRRM in a multiple wireless network, characterized in that access to the mobile terminal to one of the heterogeneous networks is determined by the CRRM or the mobile terminal. The method of claim 6, wherein step ii) Ii-1) receiving, by the CRRM, a load value corresponding to each of an uplink and a downlink from the heterogeneous networks; And Ii-2) comparing the load value with each capacity of the heterogeneous networks, and generating a reference value by dividing the capacity value by the load value; and calculating reference values for CRRM operation in multiple wireless networks. Way. The method of claim 7, wherein step iii) Iii-1) receiving, by the CRRM, a load value corresponding to each of an uplink and a downlink from the heterogeneous networks in real time; And Iii-2) if the load value is compared with the reference value and exceeds the reference value, determining the access of the heterogeneous network further comprising the step of calculating a reference value for CRRM operation in multiple radio networks. The method according to claim 8, wherein in step VII-1), The heterogeneous networks compare the load values of the uplink and the downlink by a percentage (%), and then transmit a load value having a higher percentage to the CRRM. Way. The method according to claim 9, wherein in step VII-1), The heterogeneous networks transmit a load value of the uplink and downlink to the CRRM, respectively. delete 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 configured to generate a reference value based on the network related information, and to prioritize the networks to be redistributed by using the reference value to generate a network list; And A decision module for determining whether to access the different network for the mobile terminal based on the reference value and the different network to which the mobile terminal will access; The control module, Generating the network list based on the reference value and the network related information provided in real time from the individual network information management module; The decision module, And determining the different network based on the reference value and the network related information. The method of claim 12, wherein the individual network information management module, Receive a load value corresponding to each of an uplink and a downlink from the different networks, or the different networks convert the load value of the uplink and downlink into a percentage (%) In comparison, the common radio resource operating apparatus in the multi-radio network, characterized in that for receiving the load value of the high percentage. The method of claim 13, wherein the decision module, And comparing the load value with a reference value and determining the access of the different network when the load value is exceeded.

Images