BASE STATION, TERMINAL, AND WIRELESS COMMUNICATION SYSTEM

• US 20180007710A1
• Filed: 09/13/2017
• Published: 01/04/2018
• Est. Priority Date: 04/06/2015
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: TANAKA, YOSHINORI
• Granted Patent: US 10,681,718 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

According to one embodiment, a base station includes a licensed band transmitting unit, a determining unit, and an unlicensed band transmitting unit. The licensed band transmitting unit transmits, to a terminal, a control signal for specifying a resource in a shared band to be used for data transmission by the terminal. The determining unit determines whether the resource in the shared band is idle or busy. The unlicensed band transmitting unit transmits a permission signal for permitting transmission in the shared band when the determining unit determines that the resource in the shared band is idle. The control signal or the permission signal includes an offset indicating a time from the permission signal to a start of transmission of data from the terminal to the base station with reference to the permission signal transmitted from the unlicensed band transmitting unit.

Claims

1. A base station that performs wireless communication with a terminal by using a dedicated band dedicated to a wireless communication system including the base station and the terminal and a shared band shared with other systems, the base station comprising:

a control signal transmitting unit that transmits, to the terminal, a control signal for specifying a resource in the shared band to be used for data transmission by the terminal;

a determining unit that determines whether the resource in the shared band is idle or busy; and

a permission signal transmitting unit that transmits a permission signal for permitting transmission in the shared band when the determining unit determines that the resource in the shared band is idle, wherein

the control signal or the permission signal includes an offset indicating a time from the permission signal to a start of transmission of data from the terminal to the base station with reference to the permission signal transmitted from the permission signal transmitting unit.

2. The base station according to claim 1, wherein the permission signal transmitting unit includes identification information for identifying each of permission signals in the permission signals, and

the control signal transmitting unit includes, in the control signal, same identification information as the identification information included in the permission signal that is used as a reference of the offset by the terminal serving as a destination of the control signal.

3. The base station according to claim 2, wherein the identification information includes base station identification information for identifying the base station.

4. The base station according to claim 1, wherein the control signal transmitting unit further includes, in the control signal, time limit information indicating a time limit for the terminal to wait for the permission signal.

5. The base station according to claim 1, wherein the offset is specified in units of a subframe in Long Term Evolution (LTE).

6. A terminal that performs wireless communication with a base station by using a dedicated band dedicated to a wireless communication system including the base station and the terminal and a shared band shared with other systems, the terminal comprising:

a receiving unit that receives a permission signal transmitted from the base station when a resource in the shared band is idle and control signal for specifying a resource in the shared band to be used for data transmission to the base station; and

a transmitting unit that transmits data to the base station by using the resource in the shared band specified by the control signal, wherein

the control signal or the permission signal includes an offset indicating a time from the permission signal to a start of transmission of data to the base station with reference to the permission signal transmitted from the base station, and

the transmitting unit transmits data to the base station by using the resource in the shared band specified by the control signal after a lapse of the time indicated by the offset since reception of the permission signal by the receiving unit.

7. The terminal according to claim 6, wherein

each of the permission signal and the control signal includes identification information, and

the transmitting unit transmits data to the base station after a lapse of the time indicated by the offset since reception of the permission signal including same identification information as identification information included in the control signal transmitted to the terminal.

8. The terminal according to claim 7, wherein the identification information includes base station identification information for identifying the base station.

9. The terminal according to claim 6, wherein

the control signal further includes time limit information indicating a time limit for the terminal to wait for the permission signal, and

the transmitting unit cancels transmission of data to the base station when the permission signal is not received until the time limit indicated by the time limit information included in the control signal transmitted to the terminal.

10. The terminal according to claim 6, wherein the offset is specified in units of a subframe in LTE.

11. A wireless communication system comprising:

a base station; and

a terminal, wherein

the base station and the terminal perform wireless communication with each other by using a dedicated band dedicated to the wireless communication system and a shared band shared with other systems,

the base station includes;

a control signal transmitting unit that transmits, to the terminal, a control signal for specifying a resource in the shared band to be used for data transmission by the terminal;

a determining unit that determines whether the resource in the shared band is idle or busy; and

a permission signal transmitting unit that transmits a permission signal for permitting transmission in the shared band when the determining unit determines that the resource in the shared band is idle, wherein

the control signal or the permission signal includes an offset indicating a time from the permission signal to a start of transmission of data from the terminal to the base station with reference to the permission signal transmitted from the permission signal transmitting unit,

the terminal includes;

a receiving unit that receives the control signal and the permission signal;

a transmitting unit that transmits data to the base station by using the resource in the shared band specified by the control signal after a lapse of the time indicated by the offset since reception of the permission signal by the receiving unit.