Optical transmission system and bandwidth allocation method

Patent metadata

Field	Value
Publication number	US-11296799-B2
Application number	US-201716330605-A
Country	US
Kind code	B2
Filing date	Sep 8, 2017
Priority date	Sep 9, 2016
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

An optical transmission system includes ground stations; optical-terminating devices; a traffic-monitoring unit that detects a traffic amount of the uplink signal transmitted in a time-division multiplexing manner for each of the optical-terminating devices; and a bandwidth allocation calculation unit that estimates one optical-terminating device of the optical-terminating devices connected to one ground station of the ground stations having a cell where the moving object is positioned on the basis of the traffic amount, and calculates a first allocation amount of a bandwidth allocated to the uplink signal of the one optical-terminating device connected to the one ground station having the cell where the moving object is positioned and a second allocation amount of a bandwidth allocated to the uplink signal of another optical-terminating device of the optical-terminating devices connected to another ground station of the ground stations having a cell adjacent to the cell where the moving object is positioned.

First claim

The invention claimed is:

1. An optical transmission system comprising:
a plurality of ground stations, each acquiring an uplink signal from a wireless base station of a moving object which is positioned in an own cell;
a plurality of optical-terminating devices that transmit the uplink signal acquired from the plurality of ground stations in a time-division multiplexing manner;
a traffic monitor that detects a traffic amount of the uplink signal transmitted in a time-division multiplexing manner for each of the plurality of optical-terminating devices; and
a bandwidth allocation calculator that estimates one optical-terminating device of the plurality of optical-terminating devices connected to one ground station of the plurality of ground stations having a cell where the moving object is positioned on a basis of the traffic amount, and calculates a first allocation amount of a bandwidth allocated to the uplink signal of the one optical-terminating device connected to the one ground station having the cell where the moving object is positioned and a second allocation amount of a bandwidth allocated to the uplink signal of another optical-terminating device of the plurality of optical-terminating devices connected to another ground station of the plurality of ground stations having a cell adjacent to the cell where the moving object is positioned.

2. The optical transmission system according to claim 1 , further comprising:
a connection number acquisition unit that acquires information indicating the number of the plurality of optical-terminating devices; and
an array information generation unit that generates information indicating an array of the plurality of optical-terminating devices according to an arrangement order of the plurality of ground stations,
wherein the bandwidth allocation calculator calculates the first and second allocation amounts on a basis of the number of the plurality of optical-terminating devices and the array of the plurality of optical-terminating devices.

3. The optical transmission system according to claim 1 , further comprising a traveling direction acquisition unit that acquires information indicating a moving direction of the moving object,
wherein the bandwidth allocation calculator calculates the second allocation amount of the bandwidth which is allocated to the uplink signal of the another optical-terminating device connected to the another ground station having a cell which is positioned in the moving direction from the cell where the moving object is positioned.

4. The optical transmission system according to claim 1 ,
wherein the bandwidth allocation calculator calculates an allocation amount of a bandwidth allocated to the uplink signal of the one optical-terminating device connected to the one ground station having the cell where the moving object is positioned and an allocation amount of a bandwidth allocated to the uplink signal of another optical-terminating device connected to another ground station of the plurality of ground stations having a cell overlapping a portion of the cell where the moving object is positioned, as the first allocation amount.

5. The optical transmission system according to claim 1 ,
wherein the bandwidth allocation calculator subtracts a result obtained by multiplying the number of ground stations positioned at an end among the plurality of ground stations by a bandwidth determined in advance from either or both of the first and second allocation amounts.

6. The optical transmission system according to claim 1 , further comprising a downlink frame-processing unit that transmits a signal for making an optical-terminating device of the plurality of optical-terminating devices sleep to the optical-terminating device in which traffic of the uplink signal is not generated.

7. A bandwidth allocation method which is executed by an optical transmission system, the method comprising:
a step of acquiring an uplink signal from a wireless base station of a moving object which is positioned in a cell of one of ground stations;
a step of transmitting the uplink signal acquired from the ground stations in a time-division multiplexing manner;
a step of detecting a traffic amount of the uplink signal transmitted in a time-division multiplexing manner for each of optical-terminating devices; and
a step of estimating one optical-terminating device of the optical-terminating devices connected to one ground station of the ground stations having a cell where the moving object is positioned on the basis of the traffic amount, and calculating a first allocation amount of a bandwidth allocated to the uplink signal of the one optical-terminating device connected to the one ground station having the cell where the moving object is positioned and a second allocation amount of a bandwidth allocated to the uplink signal of another optical-terminating device of the optical-terminating devices connected to another ground station of the ground stations having a cell adjacent to the cell where the moving object is positioned.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Hisano Daisuke
• Shimada Tatsuya
• Ou hiroshi
• Nomura Hiroko

Classifications

• H04Q2011/0064

  Arbitration, scheduling or medium access control aspects · CPC title

• H04L27/2602

  Signal structure · CPC title

• H04Q2011/0086

  Network resource allocation, dimensioning or optimisation · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title