JP-7856843-B2 - Communication control method and relay device

JP7856843B2JP 7856843 B2JP7856843 B2JP 7856843B2JP-7856843-B2

Inventors

藤代真人

Assignees

京セラ株式会社

Dates

Publication Date: 20260511
Application Date: 20251126
Priority Date: 20190807

Claims (3)

A communication control method performed in a relay device, The relay device receives a BAP (Backhaul Adaptation Protocol) data unit from a lower-level relay device, If a failure occurs in the backhaul link between the first higher-level relay device and the relay device, the BAP data unit is transmitted via the backhaul link established between the relay device and the second higher-level relay device. The system includes receiving identification information relating to the first donor device from the first donor device, which is a donor device of the first higher-level relay device, The transmission includes a communication control method that transmits the BAP data unit based on the identification information.
It is a relay device, A receiving unit that receives BAP data units from a lower-level relay device of the relay device, The relay device has a transmission unit that transmits the BAP data unit via a backhaul link established between the relay device and the second higher-level relay device if a failure occurs in the backhaul link between the first higher-level relay device and the relay device. The receiving unit receives identification information relating to the first donor device from the first donor device, which is a donor device of the first higher-level relay device. The transmitting unit is a relay device that transmits the BAP data unit based on the identification information.
A processor that controls a relay device, The process of receiving a BAP (Backhaul Adaptation Protocol) data unit from a lower-level relay device of the relay device, If a failure occurs in the backhaul link between the first higher-level relay device and the relay device, the process of transmitting the BAP data unit via the backhaul link established between the relay device and the second higher-level relay device, The process of receiving identification information relating to the first donor device from the first donor device, which is a donor device of the first upper-level relay device, is performed. The aforementioned transmission process includes a processor that transmits the BAP data unit based on the identification information.

Description

This disclosure relates to a communication control method and relay device used in mobile communication systems. In the 3GPP (3rd Generation Partnership Project) (registered trademark; hereinafter the same), a standardization project for mobile communication systems, a new type of relay device called an IAB (Integrated Access and Backhaul) node is being considered. One or more relay devices intervene in communication between a base station (donor device) and user devices, performing relaying for this communication. Such relay devices possess both user device functionality and base station functionality. They use the user device functionality to perform wireless communication with higher-level devices (base stations or higher-level relay devices), and the base station functionality to perform wireless communication with lower-level devices (user devices or lower-level relay devices). The wireless section between user equipment and a relay device or base station is sometimes called an access link. The wireless section between a relay device and a base station or other relay device is sometimes called a backhaul link. Non-Patent Document 1 describes a method for dynamically switching data transfer paths by integrating and multiplexing data communication for access links and backhaul links at Layer 2, and dynamically allocating wireless resources to the backhaul link. 3GPP contribution “RP-182894” The first aspect of the communication control method is a method executed in a relay device included in a plurality of relay devices in a mobile communication system where an upstream path is formed between a user device and a first donor device using a plurality of relay devices. The communication control method includes: transferring data received from a lower-level device of the relay device in the upstream path to a first higher-level device of the relay device; buffering data not yet transmitted to the first higher-level device; re-establishing the backhaul link of the relay device with a second higher-level device if a failure occurs in the backhaul link established between the relay device and the first higher-level device; and determining whether or not to transfer the buffered data to the second higher-level device based on whether or not the second donor device managing the second higher-level device is the same as the first donor device. The relay device according to the second embodiment is a relay device included in a plurality of relay devices in a mobile communication system in which an upstream path is formed between a user device and a first donor device using a plurality of relay devices. The relay device includes a control unit that performs the following processes: transferring data received from a lower-level device of the relay device in the upstream path to a first higher-level device above the relay device; buffering data not yet transmitted to the first higher-level device; re-establishing the backhaul link of the relay device with a second higher-level device if a failure occurs in the backhaul link established between the relay device and the first higher-level device; and determining whether or not to transfer the buffered data to the second higher-level device based on whether or not the second donor device managing the second higher-level device is the same as the first donor device. This figure shows the configuration of a mobile communication system according to one embodiment.This figure shows the configuration of a base station according to one embodiment.This figure shows the configuration of a relay device according to one embodiment.This figure shows the configuration of a user device according to one embodiment.This figure shows an example of a protocol stack configuration according to one embodiment.This figure shows an operating scenario of a mobile communication system according to one embodiment.This flowchart shows an example of operation of a relay device according to one embodiment. In a situation where an upstream path is formed between the user device and the first donor device using multiple relay devices, if a failure occurs in the backhaul link established between a relay device and its higher-level device (first higher-level device), it may be necessary to re-establish the upstream path by re-establishing the relay device's backhaul link with the second higher-level device. Therefore, this disclosure aims to provide a communication control method and relay device capable of appropriately dealing with backhaul link failures. A mobile communication system according to one embodiment will be described with reference to the drawings. In the drawings, identical or similar parts are denoted by the same or similar reference numerals. (Configuration of mobile communication systems) First, the configuration of a mobile communication system according to one embodiment will be described. Figure 1 is a diagram showing the configuration of a mobile communication system 1 according