WO2022239321A1 - Control device, resource allocation control method, and computer program - Google Patents

Abstract

According to the present invention, a control device that controls allocation of the resources of a wireless access network comprises a resource usage rate acquisition unit that acquires a resource usage rate for every service, a packet count information acquisition unit that acquires information about a packet count for every service via an interface with a base station, the packet count being totaled on the basis of delay amounts for packets, a communication quality degradation level calculation unit that calculates a communication quality degradation level for every service, the communication quality degradation level indicating a degradation level for delay of the service that is based on the information about the packet count, and a control unit that controls a margin for a requested resource amount for every service on the basis of past resource usage rates and communication quality degradation levels.

Description

CONTROL DEVICE, RESOURCE ALLOCATION CONTROL METHOD, AND COMPUTER PROGRAM

The present invention relates to a control device, resource allocation control method, and computer program.
This application claims priority based on Japanese Patent Application No. 2021-80541 filed in Japan on May 11, 2021, the content of which is incorporated herein.

When various services are accommodated in a radio access network (RAN) such as a fifth generation (5G) mobile communication system (hereinafter referred to as a 5G system), the same resources (radio resources, computer resources, transmission paths resources) cannot be used simultaneously by multiple services. Therefore, in order to guarantee the communication quality of services, it is necessary to secure the resources required by each service. Here, services are bundled in units such as 5QI (5G QoS Indicator) and S-NSSAI (SubNetwork Slice Selection Assist Information, RAN slice identifier).

　In each service, resources allocated to the service are allocated to each UE (User Equipment, user terminal). At this time, if the resources allocated to the service are sufficient, the communication quality requirements of the service can be met for each UE, but if the resources are insufficient, the communication quality requirements of the service cannot be met. The amount of resources required by each service varies according to the radio quality and traffic of UEs using each service. Therefore, in order to guarantee the communication quality of services, the amount of resources required by each service is estimated periodically, and control is performed to change the allocation of resources to each service.

For example, the technology described in Non-Patent Document 1 is known as a technology for guaranteeing the communication quality of services. The technology described in Non-Patent Document 1 controls allocation of radio resources to services using radio quality information and requested traffic information when allocating resources to each service.

In addition, Non-Patent Document 2 defines parameters that can be collected in the 5G system.

However, with the technology described in Non-Patent Document 1, an error occurs between the amount of resources allocated to a service and the amount of resources actually requested by the service, making efficient resource allocation impossible. . For example, a momentary shortage of resources in one service may cause deterioration in communication quality, while other services may have a surplus because the allocated resources are not all used.

The present invention has been made in consideration of such circumstances, and its object is to prevent deterioration of communication quality when controlling the resource allocation of the radio access network for each service accommodated in the radio access network. To achieve efficient resource allocation while suppressing

According to one aspect of the present invention, a control device that controls allocation of resources in the radio access network for each service accommodated in the radio access network acquires a resource usage rate that indicates the usage rate of the resource for each service. a packet number information acquiring unit for acquiring, via an interface between a base station and a base station, information on the number of packets aggregated based on the amount of packet delay for each service; and for each service a communication quality deterioration degree calculation unit that calculates a communication quality deterioration degree indicating a degree of delay deterioration of the service based on the information on the number of packets; and a past resource usage rate and the communication quality deterioration for each service. and a control unit for controlling the margin for the requested resource amount based on the degree.
According to one aspect of the present invention, in the above control device, the communication quality deterioration degree calculation unit includes, for each of the services, the number of packets transmitted to the terminal within the requested delay and the number of packets transmitted to the terminal exceeding the requested delay. The communication quality deterioration degree is calculated based on the number of transmitted packets.
According to one aspect of the present invention, in the above control device, the communication quality deterioration degree calculation unit calculates the communication quality based on the number of packets transmitted to the terminal within the required delay and the total number of packets for each service. Calculate the degree of quality deterioration.
According to one aspect of the present invention, in the control device described above, the communication quality deterioration degree calculator calculates, for each service, based on the number of packets transmitted to the terminal exceeding the required delay and the total number of packets, The degree of communication quality deterioration is calculated.
According to one aspect of the present invention, in the above control device, the communication quality deterioration degree calculation unit calculates the communication quality deterioration degree based on the packet delay frequency distribution information for each of the services.
According to one aspect of the present invention, in the control device described above, the control unit reduces the margin associated with past services with low resource usage rates and increases the margin associated with past services with high communication quality degradation. , the margin for the requested resource amount is controlled for each service.

According to one aspect of the present invention, a resource allocation control method executed by a control device for controlling allocation of resources of the radio access network for each service accommodated in the radio access network, wherein the control device performs a resource usage rate acquisition step of acquiring a resource usage rate indicating the resource usage rate; a step of obtaining information on the number of packets obtained through an interface of the communication quality in which the control device calculates, for each service, a degree of communication quality deterioration indicating a degree of deterioration in the delay of the service based on the information on the number of packets; a deterioration degree calculation step; and a control step in which the control device controls a margin for a requested resource amount based on the past resource usage rate and the communication quality deterioration degree for each service.

According to one aspect of the present invention, a computer program stores a resource utilization rate for each service in a computer of a control device that controls allocation of resources in the radio access network for each service accommodated in the radio access network. a resource usage rate acquisition step of acquiring the resource usage rate indicated; and a packet number information acquisition step of acquiring information on the number of packets aggregated based on the packet delay amount for each service via an interface with the base station. a communication quality deterioration degree calculation step of calculating, for each service, a communication quality deterioration degree indicating a deterioration degree of delay of the service based on the information on the number of packets; and a step of calculating the past resource usage for each service. and a control step of controlling a margin for the requested resource amount based on the rate and the degree of communication quality deterioration.

Advantageous Effects of Invention According to the present invention, it is possible to efficiently allocate resources while suppressing degradation of communication quality when controlling allocation of resources in a radio access network for each service accommodated in the radio access network. is obtained.

1 is a block diagram showing a configuration example of a radio access network according to an embodiment; FIG. 4 is a block diagram showing a configuration example of a control node according to one embodiment; FIG. FIG. 4 is a flow diagram showing the overall procedure of a resource allocation control method according to one embodiment; It is a figure which shows the example of a parameter definition which concerns on one Embodiment. It is a figure which shows the example of a parameter definition which concerns on one Embodiment. 5 is a table showing an example of packet delay frequency distribution information according to one embodiment; FIG. 4 is an explanatory diagram of a specific example of resource allocation control according to one embodiment; FIG. 4 is an explanatory diagram of a specific example of resource allocation control according to one embodiment; FIG. 4 is an explanatory diagram of a specific example of resource allocation control according to one embodiment; 5 is a graph showing an example of temporal change of a margin correction coefficient according to one embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration example of a radio access network according to one embodiment. In FIG. 1 a radio access network (RAN) 1 comprises a radio unit RU, a base station BS and a control node 2 . The base station BS accommodates one or a plurality of services (service #1, service #2, and service #3 in the example of FIG. 1) among a plurality of services accommodated in RAN1. Services include, for example, a 4K video distribution service and a connected car communication service. A control node 2 controls one or more base stations BS.

The control node 2 controls resource allocation of RAN1 for each service accommodated in RAN1. The control node 2 acquires various information 110 from the base station BS via the interface 100 with the base station BS. The control node 2 performs resource allocation control for each service (service #1, service #2, service #3) accommodated in the base station BS based on the information 110 acquired from the base station BS. The resources allocated to the service are radio resources, computer resources, transmission path resources, etc. of RAN1.

The control node 2 notifies the base station BS via the interface 100 of resource allocation result information 120 indicating the resource allocation results for each service (service #1, service #2, service #3). As a result, in the base station BS, for each service (service #1, service #2, service #3), each resource (resource RS #1 for service #1, resource RS # for service #2) 2. Allocation of resource RS#3) is performed for service #3.

The base station BS communicates with UEs (UE#1, UE#2, UE#3: user terminals) using each service (service #1, service #2, service #3) via the radio equipment RU. . UE #1 is a UE that uses service #1. UE#2 is a UE that uses service #2. UE#3 is a UE that uses service #3.

Each resource (resource RS#1, resource RS#2, resource RS#3) allocated to each service (service #1, service #2, service #3) is allocated to each UE (UE#1, UE#2, UE#3). Resource RS#1 is a resource allocated to service #1. Resource RS#2 is a resource allocated to service #2. Resource RS#3 is a resource allocated to service #3.

Each UE (UE#1, UE#2, UE#3) uses each service (service #1, service #2, service #3) with resources allocated to itself.

Note that RAN1 may be a RAN to which RAN slicing technology is applied. For example, RAN1 may be a 5G system. Also, the services according to this embodiment may be bundled in units such as 5QI and S-NSSAI.

FIG. 2 is a block diagram showing a configuration example of a control node according to this embodiment. In FIG. 2 , the control node 2 (control device) includes a resource usage rate acquisition unit 21 , a packet count information acquisition unit 26 , a communication quality deterioration degree calculation unit 24 and a control unit 25 . In this embodiment, the control node 2 corresponds to a control device.

Each part of the control node 2 realizes its function by having a CPU (Central Processing Unit) execute a computer program for realizing the function of each part.

The resource usage rate acquisition unit 21 acquires the resource usage rate for each service. The resource usage rate acquisition unit 21 acquires the resource usage rate of each service (service #1, service #2, service #3) from the base station BS via the interface 100. FIG. For example, the resource utilization rate for service #1 is the ratio of resources used by service #1 to resources allocated to service #1. As the resource usage rate, for example, a PRB (Physical Resource Block) usage rate for each DU (Distributed Unit) may be used. The PRB usage rate for each DU is specified in Non-Patent Document 2 regarding the interface 100 with the base station BS.

The packet number information acquisition unit 26 acquires information on the number of packets aggregated based on the delay amount of packets for each service (aggregated packet number information) via the interface 100 with the base station BS. The packet number information acquisition unit 26 acquires total packet number information of each service (service #1, service #2, service #3) from the base station BS via the interface 100. FIG. For example, the total number of packets information of service #1 is information of the number of packets totaled based on the amount of delay of packets of service #1 for all UE#1 using service #1. For example, the total number of packets information of service #1 is the number of packets transmitted from the base station BS to UE #1 within the delay time (requested delay) requested by service #1, or the number of packets transmitted from the base station BS exceeding the requested delay. It is the number of packets transmitted from the BS to UE#1. For example, the total number of packets information of service #1 is information (packet delay frequency distribution information) indicating frequency distribution of delay of packets of service #1 in the base station BS.

The communication quality deterioration degree calculation unit 24 calculates the communication quality deterioration degree for each service. In this embodiment, the degree of communication quality deterioration is information indicating the degree of deterioration of service delay. The communication quality deterioration degree calculation unit 24 calculates, for each service, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on the total number of packets information. The communication quality deterioration degree calculation unit 24 calculates each service (service #1, service # 2. Calculate the degree of communication quality deterioration indicating the degree of delay deterioration of service #3).

Here, several examples of methods for calculating the degree of communication quality deterioration will be explained.

(Example 1 of communication quality deterioration degree calculation method)
The communication quality deterioration degree calculation unit 24 calculates, for each service, the communication quality indicating the deterioration degree of the service delay based on the number of packets transmitted to the UE within the required delay and the number of packets transmitted to the UE exceeding the required delay. Calculate the degree of deterioration. For example, for service #1, the communication quality deterioration degree calculation unit 24 determines the number of packets transmitted from the base station BS to UE #1 within the requested delay of service #1, and the number of packets transmitted from the base station BS exceeding the requested delay. A communication quality deterioration degree indicating the degree of delay deterioration of service #1 is calculated based on the number of packets transmitted to UE #1. The degree of delay deterioration of service #1 is, for example, the number of packets transmitted from the base station BS to UE #1 within the requested delay of service #1 and the number of packets transmitted from the base station BS to UE #1 exceeding the requested delay. A value based on the ratio to the number of packets sent.

(Example 2 of communication quality deterioration degree calculation method)
The communication quality deterioration degree calculation unit 24 calculates, for each service, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on the number of packets transmitted to the UE within the requested delay and the total number of packets. For example, for service #1, the communication quality deterioration degree calculation unit 24 determines the number of packets transmitted from the base station BS to UE #1 within the requested delay of service #1, and the number of packets transmitted from the base station BS to all UE #1. The communication quality deterioration degree indicating the delay deterioration degree of service #1 is calculated based on the total number of packets obtained. The total number of packets for service #1 is the number of packets transmitted from the base station BS to UE #1 within the required delay of service #1 and the number of packets transmitted from the base station BS to UE #1 exceeding the required delay. It is the total number with the number of packets. The degree of delay degradation of service #1 is, for example, a value based on the ratio of the number of packets transmitted from the base station BS to UE #1 within the required delay of service #1 to the total number of packets of service #1.

(Example 3 of communication quality deterioration degree calculation method)
The communication quality deterioration degree calculation unit 24 calculates, for each service, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on the number of packets transmitted to the UE with a delay exceeding the required delay and the total number of packets. For example, for service #1, the communication quality deterioration degree calculation unit 24 calculates the number of packets transmitted from the base station BS to UE #1 exceeding the required delay of service #1, and the number of packets transmitted from the base station BS to all UE #1. A communication quality deterioration degree indicating the degree of delay deterioration of service #1 is calculated based on the total number of transmitted packets. The total number of packets for service #1 is the number of packets transmitted from the base station BS to UE #1 within the required delay of service #1 and the number of packets transmitted from the base station BS to UE #1 exceeding the required delay. It is the total number with the number of packets. The degree of delay degradation of service #1 is, for example, a value based on the ratio of the number of packets transmitted from the base station BS to UE #1 exceeding the required delay of service #1 with respect to the total number of packets of service #1. be.

(Example 4 of communication quality deterioration degree calculation method)
The communication quality deterioration degree calculation unit 24 calculates, for each service, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on packet delay frequency distribution information (packet delay frequency distribution information). For example, the communication quality deterioration degree calculation unit 24 calculates the communication quality deterioration degree indicating the degree of delay deterioration of service #1 based on the packet delay frequency distribution information of service #1.

Any one of Examples 1, 2, 3, and 4 of the communication quality deterioration degree calculation method described above may be used.

Returning to FIG.
The control unit 25 controls resource allocation of the RAN1 for each service. When controlling the resource allocation of RAN1 for each service, the control unit 25 controls the margin for the requested resource amount based on the past resource usage rate and communication quality deterioration degree for each service.

Next, the resource allocation control method according to this embodiment will be described.

The overall procedure of the resource allocation control method according to this embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the overall procedure of the resource allocation control method according to this embodiment.

The parameters related to the resource allocation control method of this embodiment are shown in the following equation (1). In the following, subscripts and superscripts such as "a" may be written as "_a".

k is a time step number that identifies a time step at which resource allocation control is executed.
s is a service number that identifies a service.
Ω_^_k,s is the resource budget of service s at timestep k.
ω_k,s is the requested resource amount of service s at timestep k. The requested resource amount ω_k,s is a value estimated from the radio quality C_k−1,s and the traffic amount V_k−1,s of the service s at the time step (k−1).
ε_k,s is a margin correction factor for the requested resource amount ω_k,s of service s at time step k.

d_k,s is the communication quality deterioration degree of service s at time step k.
u_k,s is the resource utilization of service s at timestep k.
u_^_k is the average value of resource utilization rates u_k,s of all services at timestep k.
d_^_k is the average value of the communication quality deterioration degrees d_k,s of all services at time step k.

In FIG. 3, the resource allocation Ω_̂_k,s of service s at time step k is calculated using the margin correction factor ε_k,s of service s at time step k. The margin correction coefficient ε_k,s of the service s at the time step k is the degree of communication quality deterioration (“d_k- 1,s","d_k-2,s",...) and resource utilization ("u_k-1,s","u_k-2,s",...). As a result, the resource allocation amount Ω_̂_k,s of service s is feedback-controlled based on the degree of communication quality deterioration and resource usage rate of service s based on past resource allocation results of service s.

(Step S1) Using the resource allocation model of each service s, the control unit 25 calculates the resource allocation amount Ω_^_k,s at each time step k for each service s. A resource allocation model for service s is shown in the following equation (2).

The resource allocation amount Ω_^_k,s of service s at time step k is calculated by multiplying the requested resource amount ω_k,s of service s at time step k by the margin correction coefficient ε_k,s of service s at time step k. be.

(Step S2) The resource allocation amount Ω_^_k,s of each service s calculated in step S1 is notified from the control node 2 to the base station BS by the resource allocation result information 120, and the resource allocation of each service s is updated. . As a result, the communication quality deterioration degree d_k,s and the resource usage rate u_k,s of each service s observed are acquired. Here, for convenience of explanation, as shown in FIG. 3, the observed values are the degree of communication quality degradation d_k−1,s observed as a result of resource allocation update at time step (k−1) and the resource usage rate Let u_k-1,s.

(Step S3) Using the communication quality deterioration degree d_k-1,s and the resource usage rate u_k-1,s at time step (k-1), the control unit 25 calculates the margin of service s at the next time step k A correction coefficient ε_k,s is calculated. The margin correction coefficient ε_k,s is represented by the following equation (3).

The margin correction coefficient ε_k,s of the service s at the time step k calculated in step S3 is used to calculate the resource allocation amount Ω__k,s of the service s at the time step k (step S1, above (2) formula).

The above steps S1-S3 are repeatedly executed.

The resource allocation control method according to the present embodiment focuses on the trade-off between the amount of available resources and the deterioration of communication quality, and uses both information to determine resources including an appropriate margin for each service. Perform feedback control for allocation. In addition, considering that the required delay is different for each service and the appropriate margin is also different, a margin adapted to each service is provided.

(Calculation method of margin correction coefficient)
A method of calculating the margin correction coefficient ε_k,s will be described. The margin correction coefficient ε_k,s is represented by the following equations (4), (5), (6) and (7).

In equations (4), (5), and (6), E_k,s is the past n time steps "(k−n) to (k−1 )” is the moving average value of the margin correction coefficients ε_k,s. n is preset.

Expression (4) is for the case where the degree of communication quality deterioration d_k-1,s is smaller than the threshold d_th,s for all services s. In this case, the margin correction coefficient ε_k,s is adjusted according to the difference between the resource usage rate u_k−1,s and the resource usage average value u_̂_k−1 using equation (4). This reduces the difference in resource usage between services.

Expression (5) is for a case where the degree of communication quality deterioration d_k−1,s is smaller than the threshold d_th,s for some services s. In this case, the margin correction coefficients ε_k, s are adjusted for each case (5a, 5b, 5c) according to equation (5).
When “the resource usage rate u_k−1,s is higher than the threshold u_th,s and the communication quality deterioration degree d_k−1,s is smaller than the threshold d_th,s”, the previous margin correction coefficient ε_k −1,s is used as the margin correction coefficient ε_k,s. This is because it can be determined that an appropriate margin is secured for the requested resource amount ω_k−1,s.
When "the resource usage rate u_k-1,s is higher than the threshold u_th,s and the communication quality deterioration degree d_k-1,s is higher than the threshold d_th,s", the communication quality deterioration degree d_k- 1, s, the margin correction coefficient ε_k, s is adjusted. As a result, the margin for the requested resource amount ω_k,s is increased for the service s with a large communication quality deterioration degree d_k−1,s.
When "the resource usage rate u_k-1,s is lower than the threshold value u_th,s", the margin correction coefficient ε_k,s is adjusted according to the resource usage rate u_k-1,s by equation (5c). As a result, the margin for the requested resource amount ω_k,s is reduced for service s with a low resource usage rate u_k−1,s.

Expression (6) is for the case where the degree of communication quality deterioration d_k-1,s is greater than the threshold d_th,s for all services s. In this case, the margin correction coefficient ε_k,s is adjusted according to the difference between the degree of deterioration of communication quality d_k−1,s and the average value d_̂_k−1 of the degree of deterioration of communication quality using equation (6). This reduces the difference in the degree of communication quality deterioration between services.

According to the resource allocation control method according to the present embodiment, the margin for the requested resource amount is reduced for services with low past resource usage rates, and for services with large past communication quality deterioration, It can be controlled so that the margin for the requested resource amount is large. As a result, it is possible to effectively use resources left over from a certain service in another service, and to suppress deterioration in communication quality.

(Calculation method of communication quality deterioration degree)
In this embodiment, the degree of service delay deterioration is calculated as the communication quality deterioration degree. As shown in Examples 1, 2, 3, and 4 of the communication quality deterioration degree calculation method described above, the service delay deterioration degree is calculated as a value based on the total number of packets information. Therefore, the total number of packets information of each service is used to calculate the degree of service delay deterioration. In examples 1, 2, and 3 of the communication quality deterioration degree calculation method, the number of packets transmitted to the UE within the required delay and the number of packets transmitted to the UE with the excess of the required delay for each service are used as total packet number information. and are used. In example 4 of the communication quality deterioration degree calculation method, information on the frequency distribution of packet delays (packet delay frequency distribution information) is used for each service as the total number of packets information.

For this reason, regarding the interface 100 between the base station BS and the existing interface defined in Non-Patent Document 2, the number of packets counted based on the amount of packet delay for each service is added. For example, a provision for the number of packets counted based on the amount of packet delay for each service identifier (5QI, QCI, S-NSSAI) is added. As a result, the number of packets transmitted to the UE within the required delay, the number of packets transmitted to the UE exceeding the required delay, and the frequency distribution of packet delays for each service as the total packet number information according to the present embodiment. (packet delay frequency distribution information), etc., can be acquired via the interface 100 with the base station BS.

4 and 5 are diagrams showing examples of defining parameters according to this embodiment. FIG. 4 shows additional portions (underlined portions in FIG. 4) 211 and 212 with respect to the provisions of Non-Patent Document 2. As shown in FIG. FIG. 5 shows additional portions (underlined portions in FIG. 5) 221 and 222 with respect to the provisions of Non-Patent Document 2. As shown in FIG. Specifically, packet delay frequency distribution information for each service identifier (5QI, QCI, S-NSSAI) in a specified time window is added. By adding this provision, the control node 2 can acquire the packet delay frequency distribution information of each service via the interface 100 .

The communication quality deterioration degree d_k-1,s indicating the degree of delay deterioration of the service at time step (k-1) is the service s for which the communication quality deterioration degree is to be calculated (target service) at time step (k-1). It is calculated by the following equation (8), for example, using the total number of packets information. Formula (8) is a calculation formula corresponding to example 2 of the communication quality deterioration degree calculation method described above.

FIG. 6 shows an example of packet delay frequency distribution information according to this embodiment. In example 4 of the communication quality deterioration degree calculation method described above, using the packet delay frequency distribution information at the time step (k-1) illustrated in FIG. In some cases, the communication quality deterioration degree d_k−1,s indicating the deterioration degree of service delay at time step (k−1) is calculated from the frequency ratio of 50 ms or less by the following equation (9).

Next, a specific example of resource allocation control according to this embodiment will be described with reference to FIGS. 7, 8, and 9 are explanatory diagrams of specific examples of resource allocation control according to this embodiment. Here, for convenience of explanation, the threshold d_th,s for the degree of communication quality deterioration and the threshold u_th,s for the resource usage rate are the same for all services s. Moving average values E_k,s of margin correction coefficients ε_k,s for each service s (s=1, 2, 3) are all set to "1.0".

(Specific example 1 of resource allocation control)
FIG. 7 shows a specific example 1 of resource allocation control when the communication quality deterioration degree d_k−1,s is smaller than the threshold value d_th,s for all services s. In the explanatory diagram 301 of FIG. 7, the degree of communication quality deterioration d_k−1,s for all three services s (s=1, 2, 3) is smaller than the threshold d_th,s. For this reason, the margin correction coefficient ε_k,s is adjusted according to the difference between the resource usage rate u_k−1,s and the resource usage average value u_̂_k−1 by the above equation (4). Specifically, according to Equation (4) above, the margin correction coefficients ε_k,s for each service s (s=1, 2, 3) are "ε_k,1=1.015", "ε_k,2=0. 98" and "ε_k, 3=1.005".

As a result, as shown in FIG. 7, for two services s (s=1, 3), the resource usage rate u_k, s is higher than the average resource usage rate u_^_k−1 ( (See explanatory diagram 302), by increasing the margin correction coefficient ε_k,s, control is performed so as to increase the margin for the required resource amount ω_k,s, and as a result of this control, the resource utilization rate u_k , s decrease (see explanatory diagram 303). On the other hand, for one service s (s=2), since the resource usage rate u_k,s is lower than the average resource usage rate u_^_k−1 (see explanatory diagram 302), the margin correction coefficient ε_k, By lowering s, control is performed so as to reduce the margin for the required resource amount ω_k,s, and as a result of this control, the resource usage rate u_k,s at time step k one time step later increases (see explanatory diagram 303).

By these controls, as shown in explanatory diagrams 302 and 303 of FIG. 7, at time step k after one time step, the difference in resource usage rate between services becomes smaller. In addition, since resource margins are given to all services s (s=1, 2, 3), deterioration of communication quality can be suppressed for all services s (s=1, 2, 3). .

(Specific example 2 of resource allocation control)
FIG. 8 shows a specific example 2 of resource allocation control when the communication quality deterioration degree d_k−1,s is smaller than the threshold d_th,s for some services s.

In explanatory diagrams 311 and 312 of FIG. 8, one service s (s=1) has a resource usage rate u_k−1,s higher than a threshold u_th,s and a communication quality deterioration degree d_k−1,s exceeding a threshold d_th,s. smaller than s. Therefore, for the service s (s=1), an appropriate margin is secured for the required resource amount ω_k−1,s. −1,1=1.0” is used as the margin correction coefficient ε_k,1.

In explanatory diagrams 311 and 312 of FIG. 8, one service s (s=2) has a resource usage rate u_k-1,s higher than a threshold u_th,s and a communication quality deterioration degree d_k-1,s higher than a threshold d_th,s. greater than s. Therefore, since the margin for the requested resource amount is insufficient for the service s (s=2), the margin correction coefficient ε_k , s (“ε_k, 2=1.02”).

In explanatory diagrams 311 and 312 of FIG. 8, one service s (s=3) has a resource usage rate u_k-1,s lower than the threshold u_th,s. Therefore, since an extra margin is secured for the service s (s=3), the margin correction coefficient ε_k,s (“ε_k, 3=0.85”).

With these controls, as shown in explanatory diagrams 313 and 314 in FIG. Free resources for service s (s=3) with a low resource usage rate u_k−1,s are accommodated, and deterioration in communication quality can be suppressed.

(Specific example 3 of resource allocation control)
FIG. 9 shows a specific example 3 of resource allocation control when the communication quality deterioration degree d_k−1,s is larger than the threshold d_th,s for all services s. In the explanatory diagram 321 of FIG. 9, all three services s (s=1, 2, 3) have a communication quality deterioration degree d_k−1,s larger than the threshold d_th,s. Therefore, the margin correction coefficient ε_k,s is adjusted according to the difference between the communication quality deterioration degree d_k−1,s and the communication quality deterioration degree average value d_̂_k−1 using the above equation (6). Specifically, according to the equation (6), the margin correction coefficients ε_k,s of each service s (s=1, 2, 3) are "ε_k,1=0.988", "ε_k,2=1. 026" and "ε_k, 3=0.986".

As a result, as shown in FIG. 9, for one service s (s=2), the degree of communication quality deterioration d_k−1,s is greater than the average value d_̂_k−1 of the degree of communication quality deterioration. Therefore, by increasing the margin correction coefficient ε_k,s, the margin for the required resource amount ω_k,s is increased. As a result of this control, the communication quality at time step k after one time step is The degree of deterioration d_k,s decreases (see explanatory diagram 323). On the other hand, for two services s (s=1, 3), since the communication quality deterioration degree d_k-1,s is smaller than the communication quality deterioration degree average value d_^_k-1 (see explanatory diagram 321) , the margin correction coefficient ε_k,s is lowered to control the margin for the required resource amount ω_k,s. (See explanatory diagram 323).

With these controls, as shown in explanatory diagrams 321, 322, 323, and 324 in FIG. , resources are accommodated from the service s (s=1, 3) with the lowest communication quality deterioration degree d_k−1,s, and the service s (s= 2) deterioration of communication quality can be suppressed.

FIG. 10 is a graph showing an example of temporal changes in margin correction coefficients according to the present embodiment. By continuously executing the feedback control according to the present embodiment, as illustrated in FIG. The margin correction factor ε_k,s is automatically adjusted so that the approaches the threshold u_th,s.

In general, each service s has a different required delay, so the susceptibility to deterioration in communication quality due to a momentary resource shortage differs from service to service. Therefore, the appropriate margin for each service s is also different, but according to this embodiment, the margin correction coefficients ε_k, s of each service s are automatically adjusted so that an appropriate margin is secured for each service s. be done. As a result, deterioration of communication quality can be suppressed regardless of the communication quality required by each service s.

As described above, according to the present embodiment, when controlling resource allocation of the radio access network (RAN1) for each service accommodated in the radio access network, efficient resource allocation can be achieved. is obtained.

As a result, it will be possible to improve overall service quality in radio access networks, for example. It will be possible to contribute to the promotion of industrialization and the expansion of innovation.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like are included within the scope of the present invention.

Alternatively, a computer program for realizing the functions of the devices described above may be recorded in a computer-readable recording medium, and the program recorded in the recording medium may be read and executed by the computer system. Note that the “computer system” referred to here may include hardware such as an OS and peripheral devices.
In addition, "computer-readable recording medium" includes writable nonvolatile memories such as flexible discs, magneto-optical discs, ROMs and flash memories, portable media such as DVDs (Digital Versatile Discs), and computer system built-in media. A storage device such as a hard disk that

Furthermore, "computer-readable recording medium" means a volatile memory (e.g., DRAM (Dynamic Random Access Memory)), which holds the program for a certain period of time, is also included. Further, the above program may be transmitted from a computer system storing this program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in a transmission medium. Here, the "transmission medium" for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the program may be for realizing part of the functions described above. Further, it may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

1 Radio Access Network (RAN)
2 control node (control device)
BS base station RU radio device UE user terminal 21 resource usage rate acquisition unit 26 packet number information acquisition unit 24 communication quality deterioration degree calculation unit 25 control unit 100 interface

Claims (8)

1. In a control device that controls resource allocation of the radio access network for each service accommodated in the radio access network,
   a resource usage rate acquisition unit that acquires a resource usage rate indicating the usage rate of the resource for each of the services;
   a packet number information acquisition unit that acquires information on the number of packets aggregated based on the packet delay amount for each service via an interface with a base station;
   a communication quality deterioration degree calculation unit that calculates, for each service, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on the information on the number of packets;
   a control unit that controls a margin for a requested resource amount based on the past resource usage rate and the degree of communication quality deterioration for each service;
   A control device comprising:
2. The communication quality deterioration degree calculation unit calculates the communication quality deterioration degree based on the number of packets transmitted to the terminal within a required delay and the number of packets transmitted to the terminal exceeding the required delay for each service. 2. The control device according to claim 1, which calculates
3. The control device according to claim 1, wherein the communication quality deterioration degree calculation unit calculates the communication quality deterioration degree based on the number of packets transmitted to the terminal within the requested delay and the total number of packets for each service.
4. 2. The control according to claim 1, wherein the communication quality deterioration degree calculation unit calculates the communication quality deterioration degree based on the total number of packets and the number of packets transmitted to the terminal exceeding the required delay for each of the services. Device.
5. The control device according to claim 1, wherein the communication quality deterioration degree calculation unit calculates the communication quality deterioration degree based on information on the frequency distribution of the delay of the packet for each of the services.
6. The control unit controls the margin for the requested resource amount for each service so as to reduce the margin for services with low resource usage in the past and increase the margin for services with high communication quality deterioration in the past. The control device according to any one of claims 1 to 5.
7. A resource allocation control method executed by a control device that controls allocation of resources in the radio access network for each service accommodated in the radio access network,
   a resource usage rate acquisition step in which the control device acquires a resource usage rate indicating the resource usage rate for each of the services;
   a packet number information acquisition step in which the control device acquires information on the number of packets aggregated based on the delay amount of packets for each service via an interface with a base station;
   a communication quality deterioration degree calculation step in which the control device calculates, for each service, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on the information on the number of packets;
   a control step in which the control device controls a margin for a requested resource amount based on the past resource usage rate and the communication quality deterioration degree for each service;
   resource allocation control method, including
8. A computer of a control device that controls resource allocation of the radio access network for each service accommodated in the radio access network,
   a resource usage rate acquisition step of acquiring a resource usage rate indicating the usage rate of the resource for each of the services;
   a packet number information obtaining step of obtaining, through an interface with a base station, information on the number of packets aggregated based on the packet delay amount for each service;
   a communication quality deterioration degree calculating step of calculating, for each of the services, a communication quality deterioration degree indicating the degree of delay deterioration of the service based on the information on the number of packets;
   a control step of controlling a margin for a requested resource amount based on the past resource usage rate and the degree of communication quality deterioration for each of the services;
   A computer program for executing

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