CN-122029902-A - Terminal and communication method

Abstract

The terminal includes a control unit that determines an operation related to a synchronization process based on subscription information, notification from a higher layer, location information, previous connection information, and part or all of communication purposes, and a reception unit that receives a cell common signal transmitted from a base station in a power saving state and performs downlink synchronization.

Inventors

• SHICHIJO TAICHI
• YOSHIOKA SHOHEI
• SHIBAIKE NAOYA
• HARADA HIROYASU

Assignees

• 株式会社NTT都科摩

Dates

Publication Date

20260512

Application Date

20240119

Claims (6)

1. 1. A terminal, having: A control unit for determining an operation related to the synchronization process based on subscription information, notification from a higher layer, location information, previous connection information, and part or all of communication purposes, and And a receiving unit that receives a cell common signal transmitted from the base station in the power saving state and performs downlink synchronization.
2. 2. The terminal of claim 1, wherein, The control unit determines to search for a resource of the cell common signal based on the subscription information, the notification from a higher layer, the location information, the previous connection information, and part or all of the communication use.
3. 3. The terminal of claim 1, wherein, The control unit determines a resource of an uplink signal for triggering a cell common signal of the base station based on the subscription information, the notification from a higher layer, the location information, the previous connection information, and part or all of the communication use.
4. 4. The terminal of claim 1, wherein, The control unit determines a resource for searching for the cell common signal, the cell common signal being defined as a different group for each communication use.
5. 5. The terminal of claim 1, wherein, The control unit determines a frequency resource, a time resource, and a period of the cell common signal based on the public land mobile network, which is the PLMN.
6. 6. A communication method performed by a terminal, comprising: Determining an action related to a synchronization procedure based on subscription information, notification from a higher layer, location information, previous connection information, and part or all of communication purposes, and The downlink synchronization is performed by receiving a cell common signal transmitted from a base station in a power saving state.

Description

Terminal and communication method Technical Field The present invention relates to a terminal and a communication method in a wireless communication system. Background In NR (New Radio: new air interface) which is a subsequent system of LTE (Long Term Evolution: long term evolution) (also referred to as "5G"), a technology of satisfying a high capacity system, a high data transmission rate, a low delay, simultaneous connection of a plurality of terminals, a low cost, power saving, and the like which are requirements is being studied (for example, non-patent document 1). In release 18 of 3GPP (registered trademark), in order to achieve environmental sustainability, carbon neutralization, SDGs (Sustainable Development Goals: sustainable development goal), reduction in operation cost, and the like, a method of increasing importance of saving power in a Network (Network ENERGY SAVINGS: network energy saving) and performing power saving has been studied (for example, non-patent document 2). Prior art literature Non-patent literature Non-patent document 1:3GPP TS 38.300 V17.3.0 (2022-12) Non-patent document 2, "New WID: network ENERGY SAVINGS for NR", RP-223540, 3GPP TSG RAN Meeting #98-e, month 12 of 2022 Non-patent document 3:3GPP TS 38.331 V17.3.0 (2022-12) Non-patent document 4:3GPP TS 38.213 V17.4.0 (2022-12) Non-patent document 5:3GPP TS 38.211 V17.4.0 (2022-12) Disclosure of Invention Problems to be solved by the invention To achieve carbon neutrality and SDGs, the importance of saving power consumption of a base station is increasing, and intermittent transceiving introduced into the base station is being studied. Currently, for cell search of a terminal, a base station needs to transmit a synchronization signal every 20 ms. In order to achieve an efficient power saving state (power saving, ENERGY SAVING, ES) state of the base station, it is necessary to strengthen the transmission inactivity function of the synchronization signal and/or other common signals. The terminal is required to receive and synchronize signals transmitted from the base station in the power saving state. The present invention has been made in view of the above-described problems, and an object of the present invention is to synchronize a base station and a terminal that have transitioned to a power saving state. Means for solving the problems According to the disclosed technology, there is provided a terminal including a control unit that determines an operation related to a synchronization process based on subscription information, notification from a higher layer, location information, previous connection information, and part or all of communication purposes, and a reception unit that receives a cell common signal transmitted from a base station in a power saving state and performs downlink synchronization. ADVANTAGEOUS EFFECTS OF INVENTION According to the disclosed technology, a base station and a terminal that have migrated to a power saving state can be synchronized. Drawings Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. Fig. 2 is a diagram for explaining CDRX in NR version 15. Fig. 3 is a diagram for explaining WUS in NR version 16. Fig. 4 is a diagram for explaining intermittent reception of a base station according to example 1 of the embodiment of the present invention. Fig. 5 is a diagram for explaining parameters of example 1 according to the embodiment of the present invention. Fig. 6 is a diagram for explaining intermittent transmission of a base station according to example 5 of the embodiment of the present invention. Fig. 7 is a diagram for explaining parameters of example 5 according to the embodiment of the present invention. Fig. 8 is a timing chart for explaining signal transmission according to example 9 of the embodiment of the present invention. Fig. 9 is a flowchart for explaining example (1) of the operation related to cell search in example 9 according to the embodiment of the present invention. Fig. 10 is a flowchart for explaining example (2) of the operation related to cell search in example 9 according to the embodiment of the present invention. Fig. 11 is a flowchart for explaining example (3) of the operation related to cell search in example 9 according to the embodiment of the present invention. Fig. 12 is a diagram showing an example of a functional configuration of a base station according to an embodiment of the present invention. Fig. 13 is a diagram showing an example of a functional configuration of a terminal according to an embodiment of the present invention. Fig. 14 is a diagram showing an example of a hardware configuration of a base station or a terminal according to an embodiment of the present invention. Fig. 15 is a diagram showing an example of a structure of a vehicle according to an embodiment of the present invention. Detailed Description Hereinafter, embodiments of the present invention will be described