Transmission power control method, communication device and program

• US 9,661,587 B2
• Filed: 08/12/2015
• Issued: 05/23/2017
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sawai, Ryo
• Primary Examiner(s): Trinh, Tan H
• Application Number:
  US14/824,701
• Publication Number:
  US 20150351045A1
• Time in Patent Office: 650 Days
• Field of Search: 455501, 455517, 455522, 455 631, 455135, 4551142, 455 134, 455450, 455512, 455 69, 455447, 455446, 455 62, 4552781, 455 6711, 455449, 455423, 4555521, 455444, 4554521, 455509, 455 68, 370311, 370342
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

There is provided a method for controlling a transmission power in a second communication service making secondary usage of a spectrum assigned to a first communication service, with use of any node of one or more secondary usage node that transmits a radio signal of the second communication service, comprising the steps of: acquiring an acceptable interference power allocated to the second communication service; calculating a total sum of interference power levels on the first communication service based on transmission powers respectively required for the one or more secondary usage node; and excluding any secondary usage node of the one or more secondary usage node from allocation of the transmission power when the calculated total sum of interference power levels is larger than the acceptable interference power.

Claims

1. An electronic device, comprising:

one or more antenna units; and

processing circuitry configured to;

obtain a request for secondary usage of a spectrum assigned to a first communication service, the request comprising location information of at least one secondary usage node; and

notify an acceptable transmission power level for a second communication service to the at least one secondary usage node, wherein the acceptable transmission power level is determined based, at least in part, on the location information.

2. The electronic device of claim 1, wherein the request for secondary usage further includes location information of secondary usage nodes other than the at least one secondary usage node.

3. The electronic device of claim 1, wherein the location information including values of latitude and longitude or values with a point of origin at a given control point.

4. The electronic device of claim 1, wherein the location information is measured by using a GPS function or measured by applying a direction of arrival estimation algorithm.

5. The electronic device of claim 3, wherein the acceptable transmission power is calculated by using the values of latitude and longitude.

6. The electronic device of claim 1, wherein the processing circuitry is further configured to notify the acceptable transmission power level by transmitting beacons to the at least one secondary usage node.

7. The electronic device of claim 1, wherein the processing circuitry is further configured to:

acquire an acceptable interference power level on the second communication service; and

calculate a total sum of interference power levels on the first communication service based on transmission power required for the at least one secondary usage node, wherein the sum of interference power levels is used to calculate the acceptable transmission power level.

8. The electronic device of claim 7, wherein the processing circuitry is further configured to:

limit communicating by using the spectrum assigned to the first communication service of one or more secondary usage nodes of the at least one secondary usage node, when the calculated total sum of interference power levels is larger than the acceptable interference power level.

9. The electronic device of claim 8, wherein the processing circuitry is further configured to:

direct the one or more limited secondary usage nodes to communicate using a spectrum different from a spectrum assigned to the first communication service.

10. The electronic device of claim 9, wherein the processing circuitry is further configured to:

calculate a second total sum of interference power levels, based on transmission power required by secondary usage nodes configured to communicate by using the spectrum assigned to the first communication service.

11. The electronic device of claim 8, wherein the processing circuitry is further configured to:

increase a transmission power corresponding to a secondary usage node of the at least one secondary usage node, when the calculated total sum of interference power levels is smaller than the acceptable interference power and a total sum of transmission powers is smaller than a given threshold depending on an interference level occurring in each secondary usage node.

12. The electronic device of claim 8, wherein the processing circuitry is further configured to limit communicating by excluding:

a secondary usage node causing a relatively high interference level on other secondary usage nodes, or

a secondary usage node causing a relatively high interference level on a primary usage node that receives a radio signal of the first communication service, or

a secondary usage node of which path loss on a communication path from a primary usage node that receives a radio signal of the first communication service is relatively low, or

a secondary usage node of which priority assigned in advance to each secondary usage node is relatively low.

13. The electronic device of claim 8, wherein the processing circuitry is further configured to limit communicating by determining a secondary usage node to be excluded according to a condition which maximizes a capacity after excluding a secondary usage node among two or more of the following conditions selected from an interference level caused on other secondary usage nodes:

an interference level caused on a primary usage node that receives a radio signal of the first communication service,

a path loss on a communication path, and

a priority assigned in advance to each secondary usage node.

14. A secondary usage node, comprising:

one or more antenna units; and

processing circuitry configured to;

transmit a request for secondary usage of a spectrum assigned to a first communication service to a management node, the request for secondary usage comprising location information of the secondary usage node; and

receive an acceptable transmission power level for a second communication service from the management node, wherein the acceptable transmission power level is determined based, at least in part, on the location information.

15. The secondary usage node of claim 14, wherein the request for secondary usage further includes location information of secondary usage nodes other than the at least one secondary usage node.

16. The secondary usage node of claim 14, wherein the processing circuitry is configured to:

receive the acceptable transmission power level by receiving beacons from the management node.

17. The electronic device of claim 14, wherein the location information including values of latitude and longitude, or values with a point of origin at a given control point.

18. The electronic device of claim 14, wherein the location information is measured by using a GPS function or measured by applying a direction of arrival estimation algorithm.

19. The electronic device of claim 18, wherein the acceptable transmission power is calculated by using the values of latitude and longitude.