CN-122029898-A - Terminal and communication method

Abstract

The terminal has a control unit which determines a resource for transmitting a wake-up signal, a transmission unit which transmits the wake-up signal to a base station in a power saving state in the determined resource, and a reception unit which receives system information from the base station, and the control unit performs initial access based on the system information.

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 that determines a resource for transmitting a wake-up signal; A transmitting unit for transmitting the wake-up signal to the base station in the power saving state in the determined resource, and A receiving unit that receives system information from the base station, The control section performs initial access based on the system information.
2. 2. The terminal of claim 1, wherein, The control unit determines the resource for transmitting the wake-up signal based on at least one of subscription information, notification from a higher layer, location information, previous connection information, and communication.
3. 3. The terminal of claim 1, wherein, The receiving section receives PSS, i.e. a primary synchronization signal, The control unit determines a resource associated with the PSS as the resource for transmitting the wake-up signal.
4. 4. The terminal of claim 1, wherein, The receiving unit receives an SSS secondary synchronization signal and the system information after the transmitting unit transmits the wake-up signal.
5. 5. The terminal of claim 1, wherein, The receiving unit receives a PSS, namely a primary synchronization signal, and an SSS, namely a secondary synchronization signal, The control unit determines resources associated with the PSS and SSS as the resources for transmitting the wake-up signal.
6. 6. A communication method performed by a terminal, comprising: Determining a resource for transmitting a wake-up signal; Transmitting the wake-up signal to a base station in a power saving state in the determined resources; Receiving system information from the base station, and And performing initial access based on the system information.

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 enable a base station that has transitioned to a power saving state to start communication with a terminal. Means for solving the problems According to the disclosed technology, there is provided a terminal having a control section that decides a resource to transmit a wake-up signal, a transmission section that transmits the wake-up signal to a base station in a power saving state in the decided resource, and a reception section that receives system information from the base station, the control section performing initial access based on the system information. ADVANTAGEOUS EFFECTS OF INVENTION According to the disclosed technology, a base station and a terminal that have migrated to a power saving state can start communication. 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 on-demand transmission of example 9 according to the embodiment of the present invention. Fig. 10 is a flowchart for explaining example (2) of on-demand transmission of example 9 according to the embodiment of the present invention. Fig. 11 is a flowchart for explaining example (3) of on-demand transmission of example 9 according to the embodiment of the present invention. Fig. 12 is a flowchart for explaining example (4) of on-demand transmission of example 9 according to the embodiment of the present invention. Fig. 13 is a diagram for explaining an example of the on-demand transmission resources of example 9 according to the embodiment of the present invention. Fig. 14 is a diagram showing an example of a functional configuration of a base station according to an embodiment of the present invention. Fig. 15 is a diagram showing an example of a functional configuration of a terminal according to an embodiment of the present invention. Fig. 16 is a diagram showing an example of a hardware configuration of a base station or a terminal according to an embodiment of th