US-12628196-B2 - Device, method, and computer readable storage medium for transmitting and receiving information for communication in licenced band

Abstract

According to various embodiments, a first user equipment (UE) includes a transceiver to transmit and receive a wireless signal; and a processor connected with the transceiver, wherein the processor is configured to identify a value related to quality of sidelink communication while the first UE performs sidelink communication in licensed band with a second UE, determine to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and perform the LBT procedure during performing the sidelink communication in the licensed band.

Inventors

• Jeoungkyu Kang
• Daewon Kim
• Taekyu Han

Assignees

• THINKWARE CORPORATION

Dates

Publication Date

20260512

Application Date

20220824

Priority Date

20210825

Claims (20)

1. 1 . A first user equipment (UE) comprising: a transceiver to transmit and receive a wireless signal; and a processor connected with the transceiver, wherein the processor is configured to: identify a value related to quality of sidelink communication while the first UE performs sidelink communication on licensed band with a second UE, determine to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and perform the LBT procedure during performing the sidelink communication on the licensed band.
2. 2 . The first UE according to claim 1 , wherein the processor is configured to: set, based on the LBT procedure, a backoff counter within a contention window, decrease the backoff counter within a plurality of slot intervals, determine, based on a value of the backoff counter being a first value, channel occupancy time, and transmit data to the second UE on the licensed band within the channel occupancy time.
3. 3 . The first UE according to claim 2 , wherein the processor is further configured to decrease the value of the backoff counter in a state in which a channel state is an idle state within the plurality of slot intervals.
4. 4 . The first UE according to claim 2 , wherein the processor is further configured to maintain the value of the backoff counter in a state in which the channel state is a busy state within the plurality of slot intervals.
5. 5 . The first UE according to claim 2 , wherein the processor is further configured to: identify that the data is not transmitted to the second UE, and increase size of the contention window.
6. 6 . The first UE according to claim 5 , wherein the size of the contention window is set less than maximum size of the contention window.
7. 7 . The first UE according to claim 1 , wherein a value related to quality of the sidelink communication is set based on sidelink-reference signal received quality (SL-RSRQ).
8. 8 . The first UE according to claim 1 , wherein the licensed band includes a band adjacent to unlicensed band, and wherein the value related to the quality of the sidelink communication is determined based on interference caused by communication in the unlicensed band.
9. 9 . The first UE according to claim 1 , wherein the sidelink communication is established based on another LBT procedure, before identifying the value related to the quality of the sidelink communication; and wherein the processor is configured to: transmit, based on the another LBT procedure, a first message including a random access preamble through a physical random access channel (PRACH) in order to perform the sidelink communication with the second UE, receive a second message from the second UE, wherein the second message includes information on resource scheduling, in response to the second message, transmit a scheduled third message based on the another LBT procedure, based on the third message, receive a fourth message including contention resolution information from the second UE, and based on the fourth message, establish a connection of the sidelink communication with the second UE on the licensed band.
10. 10 . The first UE according to claim 1 , wherein the sidelink communication is established based on another LBT procedure, before identifying the value related to the quality of the sidelink communication; and wherein the processor is configured to: transmit, based on the another LBT procedure, a message A including a random access preamble and information for performing a collision resolution procedure, to perform the sidelink communication with the second UE, receive, based on the message A, a message B including information on resource scheduling and collision resolution information from the second UE, and establish, based on the message B, a connection of sidelink communication with the second UE on the licensed band.
11. 11 . A method for operating a first user equipment (UE), the method comprising: identifying a value related to quality of sidelink communication while the first UE performs sidelink communication on licensed band with a second UE, determining to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and performing the LBT procedure during performing the sidelink communication on the licensed band.
12. 12 . The method according to claim 11 , comprising: identifying priority of the data, identifying whether the priority of the data is greater than the priority threshold value, and based on that the priority of the data is greater than the priority threshold value, transmitting the data through the sidelink on the unlicensed band with the second UE.
13. 13 . The method according to claim 12 , further comprising decreasing the value of the backoff counter in a state in which a channel state is an idle state within the plurality of slot intervals.
14. 14 . The method according to claim 12 , further comprising maintaining the value of the backoff counter in a state in which the channel state is a busy state within the plurality of slot intervals.
15. 15 . The method according to claim 12 , further comprising: identifying that the data is not transmitted to the second UE, and increasing size of the contention window.
16. 16 . The method according to claim 15 , wherein the size of the contention window is set less than maximum size of the contention window.
17. 17 . The method according to claim 11 , wherein a value related to quality of the sidelink communication is set based on sidelink-reference signal received quality (SL-RSRQ).
18. 18 . The method according to claim 11 , wherein the licensed band includes a band adjacent to unlicensed band, and wherein the value related to the quality of the sidelink communication is determined based on interference caused by communication in the unlicensed band.
19. 19 . The method according to claim 11 , wherein the sidelink communication is established based on another LBT procedure, before identifying the value related to the quality of the sidelink communication; and wherein the method further comprises: transmitting, based on the another LBT procedure, a first message including a random access preamble through a physical random access channel (PRACH) in order to perform the sidelink communication with the second UE, receiving a second message from the second UE, wherein the second message includes information on resource scheduling, in response to the second message, transmitting a scheduled third message based on the another LBT procedure, based on the third message, receiving a fourth message including contention resolution information from the second UE, and based on the fourth message, establishing a connection of the sidelink communication with the second UE on the licensed band.
20. 20 . A non-transitory computer readable medium storing one or more programs, the one or more programs including instructions, which, when being executed by at least one processor of a first user equipment (UE), cause the first UE to: identify a value related to quality of sidelink communication while the first UE performs sidelink communication on licensed band with a second UE, determine to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and perform the LBT procedure during performing the sidelink communication on the licensed band.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2021-0112670, filed on Aug. 25, 2021, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. BACKGROUND Technical Field The following descriptions relate to a device, a method, and a computer readable storage medium for performing communication in a licensed band. Description of Related Art After the first generation mobile communication, in which only voice signals are transmitted and received in the past, mobile communication has evolved to the present fifth generation (hereinafter referred to as 5G) mobile communication. The 5G mobile communication technology has been developed with the goal of enhanced mobile broadband (eMBB), ultra-reliable & low latency communication (URLLC), and machine-type communications (mMTC). Currently, development for system network improvement is in progress based on advanced small cell, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-point (CoMP) transmission and reception, interference mitigation and cancellation, and the like. 5G mobile communication technology is a new radio access technology (RAT) and is called NR (new radio). NR may support vehicle to everything (V2X) communication (i.e., C(Cellular)-V2X communication). V2X is a communication technology that exchanges information between pedestrians, objects, and vehicles through wired/wireless communication. V2X may be divided into various types. Specifically, V2X may be divided into types of vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to network (V2N), and vehicle to pedestrian (V2P). V2V refers to communication between a vehicle and a vehicle, V2I refers to communication between a vehicle and an infrastructure, V2N refers to communication between a vehicle and a network, and V2P refers to communication between a vehicle and a pedestrian. SUMMARY For C (Cellular)-V2X communication, discussion for the integrity (or URLLC) of the communication connection is currently in progress, but the procedure for securing the amount of transmitted data (or the amount of received data) is not defined. Accordingly, a method for securing the amount of data may be required. The spectrum for C-V2X communication (i.e., licensed band) and unlicensed band are set separately, and most of the signal exchange during C-V2X communication take place in the licensed band, but an error in communication and a sharp drop in reliability may occur due to an external obstacle or the like. C-V2X communication is basically communication between a vehicle and an object, and reliability and low latency of a signal may be essentially required. Since an unlicensed band and a licensed band are adjacent, interference caused by communication in the unlicensed band may occur even on the licensed band. Therefore, when continuous interference caused by the unlicensed band occurs, it may be required to perform a listen-before-talk (LBT) procedure even within the licensed band such as communication in the unlicensed band. The technical problems to be achieved in this document are not limited to those described above, and other technical problems not mentioned herein will be clearly understood by those having ordinary knowledge in the art to which the present disclosure belongs, from the following description. According to various embodiments, a first user equipment (UE) may comprise a transceiver to transmit and receive a wireless signal; and a processor connected with the transceiver, wherein the processor may be configured to identify a value related to quality of sidelink communication while the first UE performs sidelink communication in licensed band with a second UE, determine to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and perform the LBT procedure during performing the sidelink communication in the licensed band. According to various embodiments, a method for operating a first user equipment (UE) may comprise identifying a value related to quality of sidelink communication while the first UE performs sidelink communication in licensed band with a second UE, determining to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and performing the LBT procedure during performing the sidelink communication in the licensed band. According to various embodiments, a non-transitory computer readable medium may store one or more programs, wherein the one or more programs may include instructions which, when being executed by at least one processor of a first user equipme