# US 12,114,257 B2 · Connection control device, communication system, and connection control method

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- Number: US 12,114,257 B2
- Document ID: US12114257B2
- Status: Granted
- Kind: B2
- Application number: 17/569,565
- Filed: 2022-01-06
- Published: 2022-09-29
- Granted: 2024-10-08
- Earliest claimed: 2021-03-25
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Teppei Oyama
- Web page: https://patentgrep.com/patent/US12114257B2

## CPC

- H04W 48/20: Selecting an access point
- H04W 28/086: among access entities
- H04W 24/02: Arrangements for optimising operational condition
- H04W 92/12: between access points and access point controllers
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A connection control device includes: a memory; and a processor coupled to the memory. The processor executes a process including: acquiring information on reception power in a plurality of terminal devices received from each of a plurality of radio units; aggregating an estimated communication load in each of the radio units by using the information on the reception power; determining a radio unit that belongs to each of a plurality of cells on a basis of an index indicating variance in a processing load for each cell associated with the estimated communication load in each of the radio units in the respective cells; and generating connection control information that allows a baseband processing device that manages a cell to be connected to the radio unit that belongs to the cell.

## Claims

### Claim 1

A connection control device comprising:
a memory; and
processor circuitry coupled to the memory, and configured to execute a process including:
acquiring information on reception power in a plurality of terminal devices received from each of a plurality of radio units;
aggregating an estimated communication load in each of the radio units by using the information on the reception power;
determining a radio unit that belongs to each of a plurality of cells on a basis of an index indicating variance in a processing load for each cell associated with the estimated communication load in each of the radio units in the respective cells; and
generating connection control information that allows a baseband processing device that manages a cell to be connected to the radio unit that belongs to the cell,
wherein
the determining includes
selecting a parent radio unit belonging to each of the cells on a basis of positional relationships between the radio units, and
determining a child radio unit by determining, on a basis of the index indicating the variance in the processing load for each cell to which the parent radio unit belongs, whether an adjacent radio unit that is adjacent to the cell to which the parent radio unit belongs is allowed to be the child radio unit that belongs to the same cell as the cell to which the parent radio unit belongs.

### Claim 2 (depends on 1)

The connection control device according to claim 1, wherein the aggregating includes aggregating the number of connected terminals to be connected to each of the radio units in a case where each of the terminal devices serves as a connected terminal that performs radio communication with a radio unit contributing the maximum reception power.

### Claim 3 (depends on 1)

The connection control device according to claim 1, wherein the aggregating includes aggregating a traffic volume of connected terminals to be connected to each of the radio units in a case where each of the terminal devices serves as a connected terminal that performs radio communication with a radio unit contributing the maximum reception power.

### Claim 4 (depends on 1)

The connection control device according to claim 1, wherein the selecting includes selecting a first radio unit to which a maximum estimated communication load is applied as a parent radio unit that belongs to a first cell, and selecting a second radio unit in which a sum of distances between the second radio unit and each of the selected parent radio units is the maximum as a parent radio unit that belongs to another cell.

### Claim 5 (depends on 1)

The connection control device according to claim 1, wherein the determining the child radio unit includes adding the adjacent radio unit as the child radio unit belonging to the cell such that the index indicating the variance in the processing load for each cell is minimized.

### Claim 6 (depends on 1)

The connection control device according to claim 1, wherein the process further includes calculating an interference score indicating a magnitude of interference between a pair of the radio units by using the information on the reception power, and
the selecting includes selecting the parent radio unit on a basis of the positional relationships between the radio units in accordance with the interference score.

### Claim 7 (depends on 1)

The connection control device according to claim 1, wherein the process further includes calculating an interference score indicating a magnitude of interference between a pair of the radio units by using the information on the reception power, and
the determining the child radio unit includes determining whether the adjacent radio unit specified by using the interference score is allowed to be the child radio unit.

### Claim 8

A communication system comprising a plurality of radio units that perform radio communication with a plurality of terminal devices, a plurality of baseband processing devices that are connected to the radio units, and a connection control device that controls a connection between the radio units and the baseband processing devices, wherein the connection control device includes
a memory, and
processor circuitry coupled to the memory, and configured to execute a process including:
acquiring information on reception power in the terminal devices received from each of the radio units;
aggregating an estimated communication load in each of the radio units by using the information on the reception power;
determining a radio unit that belongs to each of a plurality of cells on a basis of an index indicating variance in processing load for each cell associated with the estimated communication load in each of the radio units in the respective cells; and
generating connection control information that allows a baseband processing device that manages a cell to be connected to the radio unit that belongs to the cell, wherein
the determining includes
selecting a parent radio unit belonging to each of the cells on a basis of positional relationships between the radio units, and
determining a child radio unit by determining, on a basis of the index indicating the variance in the processing load for each cell to which the parent radio unit belongs, whether an adjacent radio unit that is adjacent to the cell to which the parent radio unit belongs is allowed to be the child radio unit that belongs to the same cell as the cell to which the parent radio unit belongs.

### Claim 9

A connection control method comprising:
acquiring information on reception power in a plurality of terminal devices received from each of a plurality of radio units;
aggregating, by processor circuitry, an estimated communication load in each of the radio units by using the information on the reception power;
determining, by the processor circuitry, a radio unit that belongs to each of a plurality of cells on a basis of an index indicating variance in processing load for each cell associated with the estimated communication load in each of the radio units in the respective cells; and
generating, by the processor circuitry, connection control information that allows a baseband processing device that manages a cell to be connected to the radio unit that belongs to the cell, wherein
the determining includes
selecting a parent radio unit belonging to each of the cells on a basis of positional relationships between the radio units, and
determining a child radio unit by determining, on a basis of the index indicating the variance in the processing load for each cell to which the parent radio unit belongs, whether an adjacent radio unit that is adjacent to the cell to which the parent radio unit belongs is allowed to be the child radio unit that belongs to the same cell as the cell to which the parent radio unit belongs.