COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL SYSTEM

• US 20140219235A1
• Filed: 07/13/2012
• Published: 08/07/2014
• Est. Priority Date: 09/16/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kimura, Ryota, Sawai, Ryo
• Granted Patent: US 9,736,784 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/386 centralized, e.g. when the radio network controller or equivalent takes part in the power control

Abstract

There is provided a communication control device including a power distribution unit configured to distribute, to one or more secondary systems, a transmission power accepted for a secondary usage of a frequency channel which is protected for a primary system, and a notification unit configured to notify each secondary system of a value of a second transmission power which is decided depending on a value of a first transmission power distributed by the power distribution unit. Upon updating the transmission power, only in a case where a value of the second transmission power which is previously notified and a value of the first transmission power which is newly distributed by the power distribution unit satisfy a predetermined condition with respect to a certain secondary system, the notification unit notifies the secondary system of a new value of the second transmission power.

Claims

1. A communication control device comprising:

a power distribution unit configured to distribute, to one or more secondary systems, a transmission power accepted for a secondary usage of a frequency channel which is protected for a primary system; and

a notification unit configured to notify each secondary system of a value of a second transmission power which is decided depending on a value of a first transmission power distributed by the power distribution unit,

wherein, upon updating the transmission power, only in a case where a value of the second transmission power which is previously notified and a value of the first transmission power which is newly distributed by the power distribution unit satisfy a predetermined condition with respect to a certain secondary system, the notification unit notifies the secondary system of a new value of the second transmission power.

2. The communication control device according to claim 1, wherein the predetermined condition includes a condition that the value of the second transmission power which is previously notified is larger than the value of the first transmission power which is newly distributed by the power distribution unit.

3. The communication control device according to claim 1, wherein the predetermined condition includes a condition that a difference is larger than a predetermined threshold, the difference being obtained by subtracting the value of the second transmission power which is previously notified from the new value of the second transmission power decided depending on the value of the first transmission power which is newly distributed.

4. The communication control device according to claim 1, wherein the value of the second transmission power is decided by removing a predetermined margin from the value of the first transmission power.

5. The communication control device according to claim 1, wherein in a case where the new value of the second transmission power which distributed to an existing secondary system is larger than the maximum value of the transmission power capable of being output in the secondary system, the notification unit does not notify the secondary system of the new value of the second transmission power.

6. The communication control device according to claim 1, wherein the power distribution unit carries out distribution calculation of the first transmission power in response to events including change in the number of the secondary systems or move of the secondary system, or periodically.

7. The communication control device according to claim 1, wherein, upon updating the transmission power, the notification unit further compares a sum of interference amounts to the primary system on a basis of a value of an allocable transmission power across the one or more secondary systems with an acceptable interference amount of the primary system, and notifies the existing secondary system of the new value of the second transmission power only in a case where the sum of the interference amounts violates the acceptable interference amount.

8. The communication control device according to claim 1, wherein the notification unit notifies each secondary system of the new value of the second transmission power by signaling a difference value from the previous notification of the second transmission power.

9. The communication control device according to claim 8,

wherein the value of the second transmission power is discretely updated in terms of integral multiple of a predetermined unit of update, and

wherein the notification unit signals the difference value quantized by use of the predetermined unit of update.

10. The communication control device according to claim 1, wherein the power distribution unit distributes the transmission power to the one or more secondary systems by evaluating an interference between channels from each secondary system to the primary system using a simplified method which does not depend on a path loss of each secondary system.

11. The communication control device according to claim 10, wherein the power distribution unit evaluates the interference between channels from each secondary system to the primary system using the number of nominal secondary systems which does not completely follow the number of actual secondary systems for each channel.

12. A communication control method comprising:

distributing, to one or more secondary systems, a transmission power accepted for a secondary usage of a frequency channel which is protected for a primary system; and

notifying each secondary system of a value of a second transmission power which is decided depending on a value of a first transmission power distributed by the power distribution unit,

wherein, upon updating the transmission power, only in a case where a value of the second transmission power which is previously notified and a value of the first transmission power which is newly distributed satisfy a predetermined condition with respect to a certain secondary system, the secondary system is notified of a new value of the second transmission power.

13. A communication control system comprising:

a communication control device including

a power distribution unit configured to distribute, to one or more secondary systems, a transmission power accepted for a secondary usage of a frequency channel which is protected for a primary system, and

a notification unit configured to notify each secondary system of a value of a second transmission power which is decided depending on a value of a first transmission power distributed by the power distribution unit; and

a communication device configured to set a transmission power for operating the secondary system within a range of the value of the second transmission power notified from the communication control device,

wherein, upon updating the transmission power, only in a case where a value of the second transmission power which is previously notified to the communication device and a value of the first transmission power which is newly distributed to the communication device satisfy a predetermined condition, the notification unit of the communication control device notifies the communication device of the new value of the second transmission power.