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US-12628201-B2 - Transmission node and transmission method

US12628201B2US 12628201 B2US12628201 B2US 12628201B2US-12628201-B2

Abstract

A transmission node includes: a reception unit configured to receive a notification of a resource to be used for transmission; a control unit configured to execute an LBT (Listen before talk) to obtain a resource that is selected autonomously; and a transmission unit configured to transmit a desired signal with at least one of the resource of the notification and the resource obtained by the LBT.

Inventors

  • Masaya Okamura
  • Shinya Kumagai
  • Shohei Yoshioka
  • Yuki Takahashi
  • Mayuko Okano

Assignees

  • NTT DOCOMO, INC.

Dates

Publication Date
20260512
Application Date
20210414

Claims (4)

  1. 1 . A transmission node comprising: a receiver configured to receive a notification of a resource to be used for transmission; a processor configured to execute a Listen before talk (LBT) to obtain a resource that is selected autonomously; and a transmitter configured to transmit a desired signal with at least one of the resource of the notification and the resource obtained by the LBT, wherein the transmitter determines which one of the resource of the notification and the resource obtained by the LBT is to be used for transmission of the desired signal based on a gap between an LBT interval and the resource of the notification, and wherein in a case where the gap between the LBT interval and the resource of the notification is less than a threshold value, the transmitter uses the resource of the notification and the resource obtained by the LBT consecutively.
  2. 2 . The transmission node as claimed in claim 1 , wherein the transmitter determines which one of the resource of the notification and the resource obtained by the LBT is to be used for transmission of the desired signal, based on a type of a signal.
  3. 3 . The transmission node as claimed in claim 1 , wherein a signal transmitted with the resource of the notification and a signal transmitted with the resource obtained by the LBT are of different types.
  4. 4 . A transmission method executed by a transmission node, the method comprising: receiving a notification of a resource to be used for transmission; executing a Listen before talk (LBT) to obtain a resource that is selected autonomously; transmitting a desired signal with at least one of the resource of the notification and the resource obtained by the LBT; and determining which one of the resource of the notification and the resource obtained by the LBT is to be used for transmission of the desired signal based on a gap between an LBT interval and the resource of the notification, wherein in a case where the gap between the LBT interval and the resource of the notification is less than a threshold value, the transmission node uses the resource of the notification and the resource obtained by the LBT consecutively.

Description

TECHNICAL FIELD The present invention relates to a transmission node and a transmission method in a radio communication system. BACKGROUND ART In the 3rd Generation partnership Project (3GPP), in order to achieve further increased system capacity, further increased data transmission speed, and further reduced latency in radio sections, studies on a radio communication method (the radio communication method will be referred to as “NR”, below) called 5G or NR (New Radio) are progressing. In 5G, in order to satisfy the requirements of a latency of 1 ms or less in a radio section while achieving a throughput of 10 Gbps or greater, studies on various radio techniques and network architecture have been carried out (e.g., Non-Patent document 1). Further, studies on 6G have started as the next generation radio communication method succeeding 5G, and it is expected that radio quality beyond 5G will be achieved. For example, in 6G, studies are underway to achieve even higher capacity, use of new frequency bands, even lower latency, even higher reliability, and extended coverage in new territories (high altitude, sea, and space) (e.g., Non-patent literature 2). RELATED ART DOCUMENTS Non-Patent Document [Non-patent document 1] 3GPP TS 38.300 V16.4.0 (2020-12)[Non-patent document 2] NTT DOCOMO White Paper: 5G Evolution and 6G (2020-01) SUMMARY OF THE INVENTION Problem to be Solved by the Invention In 6G, it is assumed that higher frequencies will be used for further improvements in communication speed, capacity, reliability, latency performance, and the like. A system that uses the higher frequencies can use a wide bandwidth, and a radio wave has characteristics of high straightness and low frequency selectivity. In addition, it is characterized by a large Doppler shift and a large pass loss. Due to the characteristics of the frequency band that uses the higher frequencies, there is a likelihood that control rules different from conventional cell design or scheduling techniques by a base station are more desirable from the viewpoint of the network performance. For example, it is assumed that the probability of resource conflict decreases as compared with the conventional techniques; therefore, a system in which a terminal or a base station autonomously determines resources to be used for transmission may be considered. Here, in a system in which LBT (Listen before talk) is assumed, there may be a case where it is desirable to transmit a signal without executing an LBT depending on use of a signal, for example, a signal having a high priority or the like. The present invention has been made in view of the above, and has an object to avoid a conflict of resources in a radio communication system in which resources to be used are determined autonomously, by notifying a transmission timing to a node that executes an LBT (Listen before talk). Means for Solving Problem According to the disclosed techniques, a transmission node is provided that includes: a reception unit configured to receive a notification of a resource to be used for transmission; a control unit configured to execute an LBT (Listen before talk) to obtain a resource that is selected autonomously; and a transmission unit configured to transmit a desired signal with at least one of the resource of the notification and the resource obtained by the LBT. Advantageous Effects of the Invention According to the disclosed techniques, in a radio communication system in which resources to be used are determined autonomously, a conflict of resources can be avoided by notifying a transmission timing to a node that executes an LBT (Listen before talk). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example (1) of a radio communication system according to an embodiment of the present invention; FIG. 2 is a diagram illustrating an example (2) of a radio communication system according to an embodiment of the present invention; FIG. 3 is a diagram illustrating an example of scheduling; FIG. 4 is a diagram illustrating an example (1) of transmission and reception according to an embodiment of the present invention; FIG. 5 is a diagram illustrating an example (2) of transmission and reception according to an embodiment of the present invention; FIG. 6 is a diagram illustrating an example (3) of transmission and reception according to an embodiment of the present invention; FIG. 7 is a diagram illustrating an example (4) of transmission and reception according to an embodiment of the present invention; FIG. 8 is a diagram illustrating an example (1) of signal transmission according to an embodiment of the present invention; FIG. 9 is a diagram illustrating an example (2) of signal transmission according to an embodiment of the present invention; FIG. 10 is a diagram illustrating an example (3) of signal transmission according to an embodiment of the present invention; FIG. 11 is a diagram illustrating an example (4) of signal transmission according to an emb