METHOD FOR TRANSMITTING SIGNAL ON BASIS OF CLEAR CHANNEL ASSESSMENT IN UNLICENSED BAND CHANNEL, AND MOBILE COMMUNICATION SYSTEM

• US 20180220459A1
• Filed: 07/29/2016
• Published: 08/02/2018
• Est. Priority Date: 07/31/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PARK, Seung-Hoon, RYOO, Sun-Heui, MOON, Jung-Min
• Granted Patent: US 10,257,856 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

Disclosed is a 5G or pre-5G communication system for supporting a data transmission rate higher than that of a 4G communication system such as LTE. Disclosed are: a method for transmitting a signal in an unlicensed band channel on the basis of a counter reduction in the unlicensed band channel of a mobile communication system and a clear channel assessment (CCA) of the channel; and a mobile communication system, and according to an embodiment of the present disclosure, the method for transmitting a signal in an unlicensed band channel on the basis of a counter reduction in the unlicensed band channel of a mobile communication system and a clear channel assessment (CCA) of the channel comprises the steps of: reducing the counter and performing a CCA for the channel, during a first period of transmitting a discovery signal and data; storing the reduced counter when a second period of transmitting only the discovery signal without the data is started; reducing the counter by using the stored counter and performing the CCA for the channel when a third period of transmitting the discovery signal and the data is started; and transmitting the discovery signal or the data on the channel on the basis of the counter value.

Claims

1. A method for transmitting a signal on a channel of a wireless communication system, the method comprising:

maintaining a counter for a second duration in which a discovery signal is transmitted but data is not transmitted;

decreasing the counter and sensing the channel for a third duration in which data is transmitted; and

transmitting data on the channel.

2. The method of claim 1, further comprising decreasing the counter and sensing the channel for a first duration in which data is transmitted before maintaining the counter for the second duration.

3. The method of claim 1, wherein the counter is randomly set between 1 and Q.

4. The method of claim 2, wherein thresholds in listen before talk (LBT) parameters are differently set for the first duration and the second duration.

5. The method of claim 3, wherein Q is set between a minimum value and a maximum value for a contention window (CW).

6. The method of claim 5, wherein the minimum value or the maximum value for the CW are differently set for the first duration and the second duration.

7. The method of claim 1, wherein if the channel for the third duration is sensed to be idle, the counter is decreased by one.

8. The method of claim 1, wherein the transmitting of the data on the channel comprises transmitting the data on the channel if the channel for the third duration is sensed to be idle.

19. The method of claim 1, wherein the transmitting of the data on the channel comprises transmitting the data on the channel if a value of the counter is zero.

20. The method of claim 2, wherein the first duration is less than 1 ms.

9. A wireless communication system for transmitting a signal on a channel, the wireless communication system comprising:

a counter which is maintained for a second duration in which a discovery signal is transmitted but data is not transmitted,

wherein the counter is reduced and the channel is sensed for a third period in which data is transmitted, and

wherein data is transmitted on the channel.

10. The wireless communication system of claim 9, wherein the counter is decreased and the channel is sensed for a first duration in which data is transmitted before maintaining the counter for the second duration.

11. The wireless communication system of claim 9, wherein the counter is randomly set between 1 and Q.

12. The wireless communication system of claim 10, wherein thresholds in listen before talk (LBT) parameters are differently set for the first duration and the second duration.

13. The mobile wireless communication system of claim 11, wherein Q is set between a minimum value and a maximum value for a contention window (CW).

14. The wireless communication system of claim 13, wherein the minimum value or the maximum value for the CW are differently set for the first duration and the second duration.

15. The wireless communication system of claim 9, wherein if the channel for the third duration is sensed to be idle, the counter is decreased by one.

16. The wireless communication system of claim 9, wherein the transmitting of the data on the channel comprises transmitting the data on the channel if the channel for the third duration is sensed to be idle.

17. The wireless communication system of claim 9, wherein the transmitting of the data on the channel comprises transmitting the data on the channel if a value of the counter is zero.

18. The wireless communication system of claim 10, wherein the first duration is less than 1 ms.