Control device and control method

1. A control device in a communication system that includes a plurality of base station devices and terminal devices connected via radio to the base station devices, comprising:

a memory; and

a processor coupled to the memory and configured to:

calculate a needed radio resource amount of each of a plurality of slices classified based on requested quality;

estimate, for each of the plurality of base station devices, an amount of interference between the base station devices, an amount of interference between the base station devices and the terminal devices, and an amount of interference between the terminal devices, in each of the plurality of slices;

allocate, in radio resources of a first base station device, a first resource for a first slice, a second resource for a second slice that has higher requested quality than requested quality of the first slice, and a restricted resource to which restrictions are imposed on use, based on a result of the estimation;

allocate a resource other than the second resource and the restricted resource as the first resource;

allocate a resource that is allocated in a second base station device and has influence on interference with the second slice, as the restricted resource;

build a slice such that the requested quality is met, based on probability distribution of radio quality between the base station devices and the terminal devices;

calculate each of packet sizes of pieces of traffic to be multiplexed on each of the slices; and

determine an amount of radio resources to be allocated to each of the slices, based on a minimum transmittable rate of each of the slices and the packet sizes.

2. The control device according to claim 1 , wherein in allocating a resource for the first slice in the first base station device, a resource different from the resource that is allocated in the second base station device and has influence on interference with the second slice is allocated.

3. The control device according to claim 1 , wherein the plurality of slices includes slices obtained by further classifying constituent slices configured by a core network, according to a radio environment.

4. The control device according to claim 1 , wherein in estimating the amount of interference, the processor estimates interference that occurs when each of the base station devices uses the same channel.

5. The control device according to claim 4 , wherein in estimating the amount of interference, the processor further estimates the interference that occurs when each of the base station devices uses adjacent channels.

6. The control device according to claim 1 , wherein in estimating the amount of interference, the processor estimates interference that occurs when any of the terminal devices is located near an end part of a cell configured by one of the base station devices.

7. The control device according to claim 1 , wherein in estimating the amount of interference, the estimation unit evaluates influence of the amount of interference, based on variations in a frame configuration for each of the base station devices or an amount of offset in frame timing.

8. The control device according to claim 1 , wherein the processor estimates a minimum transmittable rate that meets the requested quality for the slices from distribution of transmission rates of the slices.

9. The control device according to claim 1 , wherein the processor collects a measured value of radio quality from at least one of each of the base station devices and each of the terminal devices and, corrects the estimated probability distribution, according to a coefficient used for smoothing on the measured value.

10. A control method for a control device of a communication system that includes a plurality of base station devices, terminal devices connected via radio to the base station devices, and the control device that controls the base station devices, the control method comprising:

calculating a needed radio resource amount of each of a plurality of slices classified based on requested quality, and estimating, for each of the plurality of base station devices, an amount of interference between the base station devices, an amount of interference between the base station devices and the terminal devices, and an amount of interference between the terminal devices, in each of the plurality of slices;

allocating, in radio resources of a first base station device, a first resource for a first slice, a second resource for a second slice that has higher requested quality than requested quality of the first slice, and a restricted resource to which restrictions are imposed on use, based on a result of the estimation;

building a slice such that the requested quality is met, based on probability distribution of radio quality between the base station devices and the terminal devices;

calculating each of packet sizes of pieces of traffic to be multiplexed on each of the slices; and

determining an amount of radio resources to be allocated to each of the slices, based on a minimum transmittable rate of each of the slices and the packet sizes, and

in the allocating, a resource other than the second resource and the restricted resource is allocated as the first resource, and a resource that is allocated in a second base station device and has influence on interference with the second slice is allocated as the restricted resource.