US-20260129536-A1 - TERMINAL, BASE STATION AND COMMUNICATION METHOD

Abstract

A terminal includes: a receiving unit configured to receive system information via downlink; and a control unit configured to assume that information that indicates whether or not a serving cell is a cell supporting a base station energy saving function is included in the system information.

Inventors

• Tianyang Min

Assignees

• NTT DOCOMO, INC.

Dates

Publication Date

20260507

Application Date

20230824

Priority Date

20221014

Claims (6)

1. 1 . A terminal comprising: a receiving unit configured to receive system information via downlink; and a control unit configured to assume that information that indicates whether or not a serving cell is a cell supporting a base station energy saving function is included in the system information.
2. 2 . The terminal according to claim 1 , wherein the control unit is configured to assume that information about an on period or an off period of a cell or cells that neighbor the serving cell is reported.
3. 3 . The terminal according to claim 1 , further comprising a transmitting unit configured to transmit, via uplink, a command that indicates whether or not the cell supporting the base station energy saving function is desired.
4. 4 . A base station comprising: a receiving unit configured to receive information that indicates a handover request from a terminal supporting a base station energy saving function; and a transmitting unit configured to transmit, to another base station that serves as a handover destination, a command that indicates that the terminal is a terminal supporting the base station energy saving function.
5. 5 . The base station according to claim 4 , wherein the transmitting unit is configured to transmit information about a cell that supports the base station energy saving function to a master node or a secondary node in dual connectivity, another RAN node, or another base station that functions as a CU or a DU.
6. 6 . A communication method to be executed by a terminal, comprising: a step of receiving system information via downlink; and a step of assuming that information that indicates whether or not a serving cell is a cell supporting a base station energy saving function is included in the system information.

Description

FIELD OF THE INVENTION The present invention relates to a terminal, a base station, and a communication method in wireless communication system. BACKGROUND OF THE INVENTION The requirements of “New Radio” (NR) (also referred to as “5G”), which is a successor system of long-term evolution (LTE), include large system capacity, high data transmission speed, low latency, simultaneous access from multiple terminals, low cost, power saving, and so forth, and a variety of technologies are under study to meet these requirements (see, for example, non-patent document 1). NR Release 18 discusses specifics about how to save base stations'energy. More details are planned to be discussed in the future. RELATED-ART DOCUMENTS Non-Patent Documents Non-Patent Document 1: 3GPP TS 38.300 V16.8.0 (2021-12) SUMMARY OF THE INVENTION Technical Problem One heretofore unaddressed issue is that there are no rules about how to transmit and receive information about base station energy saving functions. The present invention has been made in view of the above and therefore aims to enable transmission and reception of information about base station energy saving functions. Solution to Problem According to the present disclosure, a terminal is provided. This terminal includes: a receiving unit configured to receive system information via downlink; and a control unit configured to assume that information that indicates whether or not a serving cell is a cell supporting a base station energy saving function is included in the system information. Advantageous Effects of Invention The present disclosure provides a technique for enabling transmission and reception of information about base station energy saving functions. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention; FIG. 2 is a sequence diagram showing an example communication flow according to a fourth embodiment of the present invention; FIG. 3 is a first sequence diagram showing an example communication flow according to a fifth embodiment of the present invention; FIG. 4 is a second sequence diagram showing an example communication flow according to the fifth embodiment of the present invention; FIG. 5 is a first sequence diagram showing an example communication flow according to a sixth embodiment of the present invention; FIG. 6 is a second sequence diagram showing an example communication flow according to the sixth embodiment of the present invention; FIG. 7 is a third sequence diagram showing an example communication flow according to the sixth embodiment of the present invention; FIG. 8 is a diagram showing an example functional structure of a base station according to an embodiment of the present invention; FIG. 9 is a diagram showing an example functional structure of a terminal according to an embodiment of the present invention; FIG. 10 is a diagram showing an example hardware structure of base station or terminal according to an embodiment of the present invention; and FIG. 11 is a diagram showing an example structure of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Now, embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the embodiments described below are only examples, and the applicability of the present invention is by no means limited to the following embodiments. Existing techniques may be used as appropriate to operate the wireless communication system according to the embodiments of the present invention. Examples of these existing techniques include, but are not limited to, existing NR or LTE. Also, unless otherwise specified, the term “LTE” as used herein has a broad meaning, covering LTE-Advanced and systems that emerged after LTE-Advanced (for example, NR). Also, in the following description of embodiments of the present invention, terms that are used in existing LTE will be used, including “synchronization signal (SS),” “primary SS (PSS),” “secondary SS (SSS),” “physical broadcast channel (PBCH),” “physical random access channel (PRACH),” “physical downlink control channel (PDCCH),” “physical downlink shared channel (PDSCH),” “physical uplink control channel (PUCCH),” “physical uplink shared channel (PUSCH),” and so forth. This is for ease of description, and signals, functions, and so forth that are the same or substantially the same as these may be referred to by other names. Also, in NR, the above terms correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, and so forth. However, signals used in NR may not be always written with the prefix “NR-.” Also, according to the embodiments of the present invention, the duplex method may be time division duplex (TDD), frequency division duplex (FDD), or any other method (including, for example, flexible duplex). Also, according to the embodiments of the present invention, when a radi