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US-12621862-B2 - Multi-carrier signal transmission method, device, and system

US12621862B2US 12621862 B2US12621862 B2US 12621862B2US-12621862-B2

Abstract

Disclosed are a method, an apparatus, and a system for transmitting a signal using multiple carriers. In detail, provided are a wireless communication apparatus including a communication module; and a processor, wherein the processor obtains a common back-off counter for a carrier set on which data is to be transmitted, wherein the carrier set includes at least one component carrier, performs back-off of each of the component carriers using the obtained common back-off counter, and simultaneously transmits data through at least one component carrier in which the back-off is completed and a wireless communication method using the same.

Inventors

  • Minseok Noh
  • Jinsam Kwak
  • Juhyung Son
  • Geonjung KO

Assignees

  • WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.

Dates

Publication Date
20260505
Application Date
20240112
Priority Date
20150731

Claims (20)

  1. 1 . A wireless communication apparatus, comprising: a communication module; and a processor, wherein the processor is functionally connected with the communication module, the processor is configured to: receive data on a first component carrier in a carrier set, transmit a HARQ-ACK (hybrid automatic repeat request-acknowledgement) related to the data, wherein the first component carrier is a component carrier in which back-off using a common back-off counter is completed, wherein the common back-off counter is obtained based on a largest contention window value among contention window values of component carriers included in the carrier set, and wherein each of the contention window values of the component carriers is independently configured.
  2. 2 . The apparatus of claim 1 , wherein the data is transmitted when the first component carrier is idle during a defer period by performing a CCA (Clear Channel Assessment) on the first component carrier during the defer period.
  3. 3 . The apparatus of claim 2 , wherein the CCA is performed when any data is not transmitted on the first component carrier after the back-off is completed.
  4. 4 . The apparatus of claim 2 , wherein the defer period is composed of at least one slot.
  5. 5 . The apparatus of claim 1 , wherein an energy detection threshold value for the back-off is determined based on at least one of a value related to bandwidth of the data and a value related to transmission power of the data.
  6. 6 . The apparatus of claim 5 , wherein the energy detection threshold value is set to be higher as the value related to transmission power of the data with respect to the value related to bandwidth of the data is lower.
  7. 7 . The apparatus of claim 1 , wherein a self-deferral is applied to a specific component carrier among the carrier set, wherein the self-deferral is that a back-off counter is not decreased when back-off is applied to a carrier.
  8. 8 . The apparatus of claim 7 , wherein the self-deferral is applied when a remaining back-off counter value of the specific component carrier is greater than zero.
  9. 9 . A data communication method in a wireless communication system, the method comprising: receiving data on a first component carrier in a carrier set; and transmitting a HARQ-ACK (hybrid automatic repeat request-acknowledgement) related to the data, wherein the first component carrier is a component carrier in which back-off using a common back-off counter is completed, wherein the common back-off counter is obtained based on a largest contention window value among contention window values of component carriers included in the carrier set, and wherein each of the contention window values of the component carriers is independently configured.
  10. 10 . The method of claim 9 , wherein the data is transmitted when the first component carrier is idle during a defer period by performing a CCA (Clear Channel Assessment) on the first component carrier during the defer period.
  11. 11 . The method of claim 10 , wherein the CCA is performed when any data is not transmitted on the first component carrier after the back-off is completed.
  12. 12 . The method of claim 10 , wherein the defer period is composed of at least one slot.
  13. 13 . The method of claim 9 , wherein an energy detection threshold value for the back-off is determined based on at least one of a value related to bandwidth of the data and a value related to transmission power of the data.
  14. 14 . The method of claim 13 , wherein the energy detection threshold value is set to be higher as the value related to transmission power of the data with respect to the value related to bandwidth of the data is lower.
  15. 15 . The method of claim 9 , wherein a self-deferral is applied to a specific component carrier among the carrier set, wherein the self-deferral is that a back-off counter is not decreased when back-off is applied to a carrier.
  16. 16 . The method of claim 15 , wherein the self-deferral is applied when a remaining back-off counter value of the specific component carrier is greater than zero.
  17. 17 . A wireless communication apparatus, comprising: a communication module; and a processor, wherein the processor is functionally connected with the communication module, the processor is configured to: obtain a common back-off counter for a carrier set on which data is to be transmitted, wherein the common back-off counter is obtained based on a largest contention window value among contention window values of component carriers included in the carrier set, wherein each of the contention window values of the component carriers is independently configured, perform back-off for each of the component carriers using the common back-off counter, transmit the data on a first component carrier in the carrier set, wherein the first component carrier is a component carrier in which the back-off is completed, and receive a HARQ-ACK (hybrid automatic repeat request-acknowledgement) related to the data.
  18. 18 . The apparatus of claim 17 , wherein the processor is further configured to: perform a CCA (Clear Channel Assessment) for the first component carrier during a defer period, wherein the data is transmitted on the first component carrier when the first component carrier is idle during the defer period.
  19. 19 . The apparatus of claim 17 , wherein the processor is further configured to perform a self-deferral not decreasing a back-off counter while performing back-off for a specific component carrier among the carrier set.
  20. 20 . The apparatus of claim 19 , wherein the self-deferral is performed when a remaining back-off counter value of the specific component carrier is greater than zero.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 18/099,264 filed on Jan. 20, 2023, which is a continuation of U.S. patent application Ser. No. 17/238,199 filed on Apr. 22, 2021, now issued as U.S. Pat. No. 11,589,390 dated Feb. 21, 2023, which is a continuation of U.S. patent application Ser. No. 15/749,097 filed on Jul. 2, 2018, now issued as U.S. Pat. No. 11,019,663 dated May 25, 2021, which is the U.S. National Stage of International Patent Application No. PCT/KR2016/008467 filed on Aug. 1, 2016, which claims the priority to Korean Patent Application No. 10-2015-0108494 filed in the Korean Intellectual Property Office on Jul. 31, 2015, Korean Patent Application No. 10-2015-0112736 filed in the Korean Intellectual Property Office on Aug. 10, 2015, Korean Patent Application No. 10-2015-0121293 filed in the Korean Intellectual Property Office on Aug. 27, 2015, Korean Patent Application No. 10-2015-0123518 filed in the Korean Intellectual Property Office on Sep. 1, 2015, Korean Patent Application No. 10-2015-0123523 filed in the Korean Intellectual Property Office on Sep. 1, 2015, and Korean Patent Application No. 10-2015-0141876 filed in the Korean Intellectual Property Office on Oct. 8, 2015, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to a wireless communication system. Particularly, the present invention relates to a method, an apparatus, and a system for transmitting a signal using multiple carriers. BACKGROUND ART In recent years, with an explosive increase of mobile traffic due to the spread of smart devices, it has been difficult to cope with data usage which increases for providing a cellular communication service only by a conventional licensed frequency spectrum or LTE-licensed frequency band. In such a situation, a scheme that uses an unlicensed frequency spectrum or LTE-Unlicensed frequency band (e.g., 2.4 GHz band, 5 GHz band, or the like) for providing the cellular communication service has been devised as a solution for a spectrum shortage problem. However, unlike the licensed band in which a communication service provider secures an exclusive frequency use right through a procedure such as auction, or the like, in the unlicensed band, multiple communication facilities can be used simultaneously without limit when only a predetermined level of adjacent band protection regulation is observed. As a result, when the unlicensed band is used in the cellular communication service, it is difficult to guarantee communication quality at a level provided in the licensed band and an interference problem with a conventional wireless communication device (e.g., wireless LAN device) using the unlicensed band may occur. Therefore, a research into a coexistence scheme with the conventional unlicensed band device and a scheme for efficiently sharing a radio channel needs to be preferentially made in order to settle an LTE technology in the unlicensed band. That is, a robust coexistence mechanism (RCM) needs to be developed in order to prevent a device using the LTE technology in the unlicensed band from influencing the conventional unlicensed band device. DISCLOSURE Technical Problem The present invention has been made in an effort to provide a method for efficiently transmitting a signal in a wireless communication system, in particular, a cellular wireless communication system and an apparatus therefor. Further, the present invention has been made in an effort to provide a method for efficiently transmitting a signal in a specific frequency band (e.g., unlicensed band) and an apparatus therefor. Technical objects desired to be achieved in the present invention are not limited to the aforementioned objects, and other technical objects not described above will be apparently understood by those skilled in the art from the following disclosure. Technical Solution According to the exemplary embodiment of the present invention, the following wireless communication apparatus and wireless communication method are provided. First, an exemplary embodiment of the present invention provides a wireless communication apparatus, including: a communication module; and a processor, wherein the processor obtains a common back-off counter for a carrier set on which data is to be transmitted, wherein the carrier set includes at least one component carrier, performs back-off of each of the component carriers using the obtained common back-off counter, and simultaneously transmits data through at least one component carrier in which the back-off is completed. In addition, an exemplary embodiment of the present invention provides a data communication method using multiple carriers, the method including: obtaining a common back-off counter for a carrier set on which data is to be transmitted, wherein the carrier set includes at least one component carrier; performing back-off of each of the component