CN-122029915-A - Terminal, base station and communication method

Abstract

The terminal includes a control unit that determines a specific component carrier from among a plurality of component carriers in a frequency band in which resources of the plurality of component carriers are bundled, and a communication unit that performs communication during random access using the specific component carrier.

Inventors

• Genyoko Okano
• YOSHIOKA SHOHEI
• NAGATA AKIRA

Assignees

• 株式会社NTT都科摩

Dates

Publication Date

20260512

Application Date

20240119

Claims (6)

1. 1. A terminal is provided with: a control unit for determining a specific component carrier from a plurality of component carriers in a frequency band in which resources of the plurality of component carriers are bundled, and And a communication unit that performs communication during random access using the specific component carrier.
2. 2. The terminal of claim 1, wherein, The control unit determines the component carrier of the P (S) cell as the specific component carrier, or Deciding the specific component carrier based on notification from the base station, or Determining the specific component carrier based on the measurement result of the synchronization signal, or Deciding the specific component carrier based on the index, or The component carrier on which the transmission or reception of the specific signal or channel is performed is determined as the specific component carrier.
3. 3. The terminal of claim 1, wherein, The communication unit transmits or receives a specific channel or a specific signal in the random access procedure using one or more component carriers that do not constitute the frequency band.
4. 4. The terminal of claim 1, wherein, The communication unit receives a TA command for each component carrier constituting the frequency band, or A TA command for the specific component carrier and differential information about other component carriers constituting the frequency band are received.
5. 5. A base station, comprising: a control unit for determining a specific component carrier from a plurality of component carriers in a frequency band in which resources of the plurality of component carriers are bundled, and And a communication unit that performs communication during random access using the specific component carrier.
6. 6. A communication method performed by a terminal, the communication method comprising the steps of: Determining a specific component carrier from among a plurality of component carriers in a frequency band in which resources of the plurality of component carriers are bundled, and And carrying out communication in the random access process by using the specific component carrier.

Description

Terminal, base station and communication method Technical Field The present invention relates to a terminal, a base station, 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, low cost, power saving, and the like which are required conditions is being studied (for example, non-patent document 1). In addition, in NR, a carrier aggregation (CA: carrier Aggregation) function using a wide band in order to secure data resources is still studied following LTE. In the carrier aggregation function, by bundling a plurality of component carriers (CC: component Carrier), data resources of a wide band can be ensured. Prior art literature Non-patent literature Non-patent document 1:3GPP TS 38.300 V18.0.0 (2023-12) Disclosure of Invention Problems to be solved by the invention In future systems (e.g., NR version 18 and the successor to NR, i.e., 6G), more flexible and efficient resource allocation may be required. However, in the existing carrier aggregation function, data resources need to be scheduled for each of the multiple bundled component carriers, which has a problem of large overhead for resource allocation. In response to this problem, a technique of bundling resources using a plurality of component carriers has been proposed. However, in the technique of bundling resources using a plurality of component carriers, an action related to initial access is not clear. Therefore, in the related art, in the case of bundling resources using a plurality of component carriers, there is a possibility that an action related to initial access cannot be properly performed. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique capable of appropriately performing an operation related to initial access when bundling resources using a plurality of component carriers. Means for solving the problems According to the disclosed technology, a terminal is provided with a control unit that determines a specific component carrier from among a plurality of component carriers in a frequency band in which resources of the plurality of component carriers are bundled, and a communication unit that performs communication during random access using the specific component carrier. Effects of the invention According to the disclosed technology, a technology is provided that can perform an operation related to initial access appropriately when bundling resources that utilize a plurality of component carriers. 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 a wireless communication system according to an embodiment of the present invention. Fig. 3 is a first diagram illustrating an example of the configuration of a virtual CC according to an embodiment of the present invention. Fig. 4 is a second diagram illustrating an example of the configuration of a virtual CC according to an embodiment of the present invention. Fig. 5 is a diagram for explaining basic operations of the embodiment of the present invention. Fig. 6 is a diagram illustrating use examples of virtual CCs and actual CCs in initial access. Fig. 7 is a diagram showing use examples of virtual CCs and actual CCs in initial access. Fig. 8 is a diagram showing use examples of virtual CCs and actual CCs in initial access. Fig. 9 is a diagram showing use examples of virtual CCs and actual CCs in initial access. Fig. 10 is a diagram showing use examples of virtual CCs and actual CCs in initial access. Fig. 11 is a diagram showing use examples of virtual CCs and actual CCs with respect to a synchronization signal. Fig. 12 is a diagram showing use examples of virtual CCs and actual CCs with respect to a synchronization signal. Fig. 13 is a diagram showing an example of a functional configuration of a base station according to an embodiment of the present invention. Fig. 14 is a diagram showing an example of a functional configuration of a terminal according to an embodiment of the present invention. Fig. 15 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. 16 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 with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. In the operation of the wireless communi