CHANNEL ACCESS METHOD IN UNMANNED AERIAL VEHICLE (UAV) CONTROL AND NON-PAYLOAD COMMUNICATION (CNPC) SYSTEM

• US 20180136645A1
• Filed: 05/31/2017
• Published: 05/17/2018
• Est. Priority Date: 11/14/2016
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: HONG, Tae Chul, KIM, Hee Wook, LIM, Kwang Jae
• Granted Patent: US 10,429,836 B2
• Time in Patent Office: Days
• CPC Class Codes: B64U 10/00 Type of UAV
• CPC Class Codes: G05D 1/0022 characterised by the communication link data switching networks in general H04L12/00
• CPC Class Codes: G08C 17/00 Arrangements for transmitting signals characterised by the use of a wireless electrical link
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 2201/50 Receiving or transmitting feedback, e.g. replies, status updates, acknowledgements, from the controlled devices
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/00 Wireless channel access

Abstract

A channel access method in an unmanned aerial vehicle (UAV) control and non-payload communication (CNPC) system is provided. The channel access method may include setting an uplink frequency and a downlink frequency to each of a ground station and an airborne radio station, and performing, by the ground station and the airborne radio station, an initial access using the uplink frequency or the downlink frequency.

Claims

1. A channel access method in an unmanned aerial vehicle (UAV) control and non-payload communication (CNPC) system, the channel access method comprising:

setting an uplink frequency and a downlink frequency to each of a ground station and an airborne radio station; and

performing, by the ground station and the airborne radio station, an initial access using the uplink frequency or the downlink frequency.

2. The channel access method of claim 1, wherein the setting comprises:

acquiring, by a ground control station (GCS), the uplink frequency and the downlink frequency from a spectrum authority (SA); and

setting, by the GCS, the uplink frequency and the downlink frequency to each of the ground station and the airborne radio station.

3. The channel access method of claim 1, wherein the setting comprises:

transmitting, by the GCS, the uplink frequency and the downlink frequency to the ground station and the airborne radio station; and

setting, by the ground station and the airborne radio station, the uplink frequency and the downlink frequency.

4. The channel access method of claim 3, wherein

the transmitting comprises transmitting, by the GCS, an assigned frequency information message to the ground station and the airborne radio station, and

the assigned frequency information message comprises the uplink frequency, the downlink frequency, an uplink data class, a downlink data class, and a UAV identification (ID).

5. The channel access method of claim 4, wherein the UAV ID is acquired by performing scrambling on a cyclic redundancy check (CRC).

6. The channel access method of claim 1, wherein the setting comprises:

measuring, by the airborne radio station, signal energy for all assignable center frequencies;

selecting at least one center frequency corresponding to signal energy that is greater than or equal to a threshold; and

setting, by the airborne radio station, the uplink frequency and the downlink frequency based on the at least one center frequency.

7. The channel access method of claim 6, wherein the measuring comprises measuring, by the airborne radio station, the signal energy in a minimum bandwidth among assignable bandwidths for all the assignable center frequencies.

8. The channel access method of claim 6, wherein the setting of the uplink frequency and the downlink frequency based on the at least one center frequency comprises:

arranging the at least one center frequency in a descending order of signal energy;

verifying, by the airborne radio station, a UAV ID of an assigned frequency information message that is received for the at least one arranged center frequency; and

setting, by the airborne radio station, the uplink frequency and the downlink frequency based on the assigned frequency information message when the UAV ID matches an ID of an actual UAV.

9. The channel access method of claim 1, wherein the setting comprises:

notifying, by the SA, a CNPC network of the uplink frequency and the downlink frequency that are assigned to the airborne radio station; and

setting, by the CNPC network, the uplink frequency and the downlink frequency to the ground station.

10. A channel access method in an unmanned aerial vehicle (UAV) control and non-payload communication (CNPC) system, the channel access method comprising:

setting a time slot of an uplink and a downlink frequency to each of a ground station and an airborne radio station; and

performing, by the ground station and the airborne radio station, an initial access using the time slot of the uplink or the downlink frequency.

11. The channel access method of claim 10, wherein the setting comprises:

acquiring, by a ground control station (GCS), the time slot of the uplink and the downlink frequency from a spectrum authority (SA); and

setting, by the GCS, the time slot of the uplink and the downlink frequency to each of the ground station and the airborne radio station.

12. The channel access method of claim 10, wherein the setting comprises:

transmitting, by the GCS, the time slot of the uplink and the downlink frequency to the ground station and the airborne radio station; and

setting, by the ground station and the airborne radio station, the time slot of the uplink and the downlink frequency.

13. The channel access method of claim 12, wherein

the transmitting comprises transmitting, by the GCS, an assigned frequency information message to the ground station and the airborne radio station, and

the assigned frequency information message comprises an uplink frequency, an uplink bandwidth, an uplink data class, a position of the time slot of the uplink, the downlink frequency, a downlink data class, and a UAV identification (ID).

14. The channel access method of claim 13, wherein the UAV ID is acquired by performing scrambling on a cyclic redundancy check (CRC).

15. The channel access method of claim 10, wherein the setting comprises:

measuring, by the airborne radio station, signal energy for all assignable center frequencies;

selecting at least one center frequency corresponding to signal energy that is greater than or equal to a threshold; and

setting, by the airborne radio station, the time slot of the uplink and the downlink frequency based on the at least one center frequency.

16. The channel access method of claim 15, wherein the measuring comprises measuring, by the airborne radio station, the signal energy in a minimum bandwidth among assignable bandwidths for all the assignable center frequencies.

17. The channel access method of claim 15, wherein the setting of the time slot of the uplink and the downlink frequency based on the at least one center frequency comprises:

arranging the at least one center frequency in a descending order of signal energy;

verifying, by the airborne radio station, a UAV ID of an assigned frequency information message that is received for the at least one arranged center frequency; and

setting, by the airborne radio station, the time slot of the uplink and the downlink frequency based on the assigned frequency information message when the UAV ID matches an ID of an actual UAV.

18. The channel access method of claim 10, wherein the setting comprises:

notifying, by the SA, a CNPC network of the time slot of the uplink and the downlink frequency that are assigned to the airborne radio station; and

setting, by the CNPC network, the time slot of the uplink and the downlink frequency to the ground station.