# US 2021/0243586 A1 · User equipment and base station device

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- Number: US 2021/0243586 A1
- Document ID: US20210243586A1
- Status: Published application
- Kind: A1
- Application number: 17/265,702
- Filed: 2018-09-13
- Published: 2021-08-05
- Earliest claimed: 2018-09-13
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Ryosuke Osawa; Huan Wang; Xufei Zheng; Xiaolin Hou
- Web page: https://patentgrep.com/patent/US20210243586A1

## CPC

- H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)}
- H04W 8/005: {Discovery of network devices, e.g. terminals}
- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04W 12/009: {specially adapted for networks, e.g. wireless sensor networks, ad-hoc networks, RFID networks or cloud networks}
- H04W 28/021: {in wireless networks with changing topologies, e.g. ad-hoc networks (self-organizing networks H04W84/18)}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/12: Wireless traffic scheduling
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W 74/0816: with collision avoidance
- H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks
- H04B 17/382: for resource allocation, admission control or handover
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 47/76: using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 4/46: for vehicle-to-vehicle communication [V2V]
- H04W 92/18: between terminal devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

A user equipment includes a receiving unit that executes sensing for a part of candidate resources to be used for transmission of inter-terminal direct communication, a control unit that determines a resource to be used for transmission based on a result of the sensing, and a transmitting unit that transmits a message to another units of user equipment using the determined resource.

## Claims

### Claim 1

A user equipment, comprising:
a receiving unit that executes sensing for a part of candidate resources to be used for transmission of inter-terminal direct communication;
a control unit that determines a resource to be used for transmission based on a result of the sensing; and
a transmitting unit that transmits a message to another user equipment using the determined resource.

### Claim 2 (depends on 1)

The user equipment according to claim 1, wherein the part of the candidate resources to be used for the transmission is one symbol at a beginning in a time domain of the candidate resources to be used for the transmission or a plurality of symbols allocated from a second symbol from the beginning.

### Claim 3 (depends on 2)

The user equipment according to claim 2, wherein, upon detecting that a resource is used in the one symbol at the beginning in the time domain of the candidate resource to be used for the transmission, the plurality of symbols allocated from the second symbol from the beginning are not sensed.

### Claim 4 (depends on 2)

The user equipment according to claim 2, wherein, upon not detecting that a resource is used in the one symbol at the beginning in the time domain of the candidate resource to be used for the transmission, the plurality of symbols allocated from the second symbol from the beginning are sensed.

### Claim 5 (depends on 1)

The user equipment according to claim 1, wherein, upon detecting a notification indicating that the candidate resources to be used for the transmission are scheduled, the candidate resources to be used for the transmission are not sensed and are excluded from resource candidates used for transmission.

### Claim 6

A base station device, comprising:
a receiving unit that receives information indicating that a candidate resource used for transmission of inter-terminal direct communication is reserved by a first user equipment; and
a control unit that prevents scheduling the candidate resources to be used for the transmission to a user equipment based on the information indicating the reservation,
wherein, when the candidate resource to be used for the transmission is already scheduled to a second user equipment, scheduling a new resource to the first user equipment is executed.