Radio terminal and base station

• US 10,425,802 B2
• Filed: 10/09/2017
• Issued: 09/24/2019
• Est. Priority Date: 04/10/2015
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Fujishiro, Masato, Chang, Henry, Yamazaki, Chiharu
• Primary Examiner(s): Roberts, Brian S
• Application Number:
  US15/728,119
• Publication Number:
  US 20180035279A1
• Time in Patent Office: 715 Days
• Field of Search: None
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 8/00 Network data management
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 92/18 between terminal devices
• CPC Class Codes: H04W 92/20 between access points

Abstract

A radio terminal according to an embodiment includes a controller configured to perform inter-frequency sidelink discovery transmission of transmitting a sidelink discovery signal at a frequency different from a frequency of a serving cell. The controller is further configured to receive, from the serving cell, a message including resource allocation information and frequency information. The resource allocation information is information indicating radio resources to be used for the inter-frequency sidelink discovery transmission. The frequency information is information indicating the different frequency to which the resource allocation information is applied.

Claims

1. A radio terminal, comprising:

a transmitter configured to perform inter-frequency sidelink discovery transmission of transmitting a sidelink discovery signal at a frequency different from a frequency of a serving cell;

a receiver configured to receive a system information block including information indicating whether the inter-frequency sidelink discovery transmission is allowed for each frequency; and

a controller configured to determine, based on the system information block, a frequency for which the inter-frequency sidelink discovery transmission is allowed, wherein

based on result of the determination, the transmitter is further configured to transmit, to the serving cell, a message including information that requests allocation of radio resources used by the radio terminal to perform the inter-frequency sidelink discovery transmission.

2. The radio terminal according to claim 1, wherein

the receiver is further configured to receive, from the serving cell, resource information indicating the radio resources allocated to the radio terminal, and

the transmitter is configured to perform the inter-frequency sidelink discovery transmission based on the resource information.

3. A method performed at a radio terminal configured to perform inter-frequency sidelink discovery transmission of transmitting a sidelink discovery signal at a frequency different from a frequency of a serving cell, the method comprising:

receiving a system information block including information indicating whether the inter-frequency sidelink discovery transmission is allowed for each frequency; and

determining, based on the system information block, a frequency for which the inter-frequency sidelink discovery transmission is allowed; and

transmitting, based on result of the determination, to the serving cell, a message including information that requests allocation of radio resources used by the radio terminal to perform the inter-frequency sidelink discovery transmission.

4. A processor provided in a radio terminal configured to perform inter-frequency sidelink discovery transmission of transmitting a sidelink discovery signal at a frequency different from a frequency of a serving cell, the processor configured to execute processes of:

receiving a system information block including information indicating whether the inter-frequency sidelink discovery transmission is allowed for each frequency; and

determining, based on the system information block, a frequency for which the inter-frequency sidelink discovery transmission is allowed; and

transmitting, based on result of the determination, to the serving cell, a message including information that requests allocation of radio resources used by the radio terminal to perform the inter-frequency sidelink discovery transmission.