KR-20260067293-A - Apparatus and Method for Transmitting and Receiving Messages

KR20260067293AKR 20260067293 AKR20260067293 AKR 20260067293AKR-20260067293-A

Abstract

According to one embodiment of the present invention, in sidelink communication, a device for periodically transmitting and receiving messages with a counterpart device may include: a memory configured to store code for periodically transmitting and receiving messages with said counterpart device; and a processor configured to execute said code to perform an operation for periodically transmitting and receiving messages with said counterpart device.

Inventors

이호정
강승모
김효곤
허현구
국승호
박용태

Assignees

고려대학교 산학협력단
주식회사 에티포스

Dates

Publication Date: 20260512
Application Date: 20250609
Priority Date: 20241105

Claims (11)

As a device for periodically transmitting and receiving messages with a counterpart device in sidelink communication, A memory configured to store code for periodically transmitting and receiving messages with the aforementioned counterpart device; and It includes a processor configured to execute the code to perform an operation for periodically transmitting and receiving messages with the aforementioned counterpart device, and The above operation is Select a resource in the resource selection window for sending and receiving the above message, and It includes receiving a message from a counterpart device or transmitting a message to a counterpart device at the selected resource above, and A device in which a parameter indicating the end time of the above resource selection window is set to less than or equal to 1/2 of the resource reservation period (RRP).
In paragraph 1, A device in which a parameter indicating the end point of the resource selection window above ensures that the transmission period or interval of periodic request messages, or the transmission period or interval of periodic response messages, is equal to or smaller than the RRP even if resource re-selection is performed.
In paragraph 1, the above operation is Includes configuring to change the configured packet delay budget (PDB), The above modified PDB is set to be smaller than the value determined by the following formula, The above RRP + 2 * parameter indicating the start time of the above resource selection window - parameter indicating the end time of the above resource selection window , device.
In paragraph 3, the above operation is A device comprising performing resource reselection when the time length to the next resource capable of transmitting a response message generated in the upper layer is greater than the changed PDB.
In paragraph 4, the above operation is A device comprising transmitting the response message from the re-selected resource.
As a method for periodically transmitting and receiving messages with a counterpart device in sidelink communication, A step of selecting a resource in a resource selection window for sending and receiving the above message; and The method includes the step of receiving a message from the counterpart device or transmitting a message to the counterpart device at the selected resource. A method in which a parameter indicating the end time of the above resource selection window is set to less than or equal to 1/2 of the resource reservation period (RRP).
In paragraph 6, A method in which a parameter indicating the end point of the above resource selection window ensures that even if resource reselection is performed, the transmission period or interval of periodic request messages, or the transmission period or interval of periodic response messages, is equal to or smaller than the above RRP.
In paragraph 6, Includes a step of configuring to change the configured packet delay budget (PDB), and The above modified PDB is set to be smaller than the value determined by the following formula, The above RRP + 2 * parameter indicating the start time of the above resource selection window - parameter indicating the end time of the above resource selection window, method.
In paragraph 8, A method comprising the step of performing resource reselection when the time length to the next resource capable of transmitting a response message generated in the upper layer is greater than the changed PDB.
In Paragraph 9, A method comprising the step of transmitting the response message from the re-selected resource.
A computer-readable medium storing a computer program for performing a method according to any one of paragraphs 6 through 10.

Description

Apparatus and Method for Transmitting and Receiving Messages in Vehicle-to-Vehicle Communication The present invention relates to wireless communication technology, and more specifically, to an apparatus and method for transmitting and receiving messages via a side link. Sidelink refers to a communication method that establishes a direct link between terminals, allowing voice or data to be exchanged directly without passing through a base station. Sidelink is being considered as a solution to alleviate the burden on base stations caused by rapidly increasing data traffic. V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, and infrastructure-enabled objects through wired or wireless communication. V2X may include V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X technology is attracting attention as a key technology that improves traffic safety and efficiency by enabling real-time information exchange between vehicles, road infrastructure, pedestrians, and other vehicles. V2X communication is generally implemented through IEEE 802.11p-based vehicle ad-hoc networks (WAVE, Wireless Access in Vehicular Environments) or 3GPP-based cellular V2X (C-V2X). In these communication methods, effective channel sensing and time delay management are essential for reliable data transmission. In V2X communication, since multiple vehicles share a common channel, channel sensing is required to prevent packet collisions and ensure efficient communication. IEEE 802.11p-based WAVE systems use the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) method to sense channels and transmit data only when available. However, this method can suffer from reduced reliability due to rapid channel changes in high-speed moving environments, and transmission latency may increase due to contention, particularly in situations with high traffic. On the other hand, C-V2X utilizes Semi-Persistent Scheduling (SPS), a schedule-based resource allocation method that transmits and receives data at regular intervals without carrier sensing, but it may lack flexibility regarding dynamic traffic changes. Delays in the channel sensing process can degrade the performance of V2X application services. For example, safety-related services such as the Emergency Vehicle Warning System (EVWS) or Collision Avoidance System require low latency and high reliability. However, in the CSMA/CA method, packet delivery may be delayed due to random delays during the backoff process, and in the C-V2X method, communication delays may occur because retransmission is required when free resources are scarce. Therefore, for efficient V2X communication, new techniques are required to enhance channel sensing accuracy and minimize packet collisions and transmission delays. In particular, for vehicle safety services where real-time data exchange is critical, technical improvements are necessary to enable stable channel access even in dynamic network environments. The accompanying drawings, which are included as part of the detailed description to aid in understanding the present invention, provide embodiments of the present invention and explain the contents of the present invention together with the detailed description. Figure 1 illustrates a V2X communication environment. Figure 2 is a figure illustrating the effect of the size of a resource selection window according to the prior art on delay. Figure 3 is a diagram illustrating the problem of delay occurring due to resource selection according to conventional technology. Figure 4 illustrates the resource reordering problem caused by resource reselection. Figure 5 shows the difference between communication delay according to the prior art and communication delay when resource reselection according to the present invention is applied. Figures 6 and 7 show simulation results according to the present invention. FIG. 8 illustrates a flowchart of a method for selecting a resource and transmitting a message from a selected resource according to the present invention. Figure 9 shows a block diagram of a transmitting device and a receiving device. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be implemented in various other forms. The terms used in this specification are intended to aid in understanding the embodiments and are not intended to limit the scope of the present invention. Furthermore, singular forms used below include plural forms unless the phrases clearly indicate otherwise. FIG. 1 illustrates a communication environment to which the present invention is applied. V2X (Vehicle to Everything) refers to a communication system that includes wireless communication (V2V) between vehicles (2). V2V serves not only the ba