Base station apparatus, terminal apparatus, and communication method

• US 10,341,874 B2
• Filed: 06/10/2015
• Issued: 07/02/2019
• Est. Priority Date: 06/13/2014
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tomeba, Hiromichi, Goto, Jungo, Nakamura, Osamu, Wakahara, Shiro, Hamaguchi, Yasuhiro
• Primary Examiner(s): Pasia, Redentor
• Application Number:
  US15/318,019
• Publication Number:
  US 20170105124A1
• Time in Patent Office: 1,483 Days
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

There are provided a base station apparatus, a terminal apparatus, and a communication method which are capable of realizing a LTE-A system with improved throughput by performing a CA technology including an unlicensed band while suppressing interference from an existing system. A base station apparatus according to the present invention, which is included in a communication system that applies a communication scheme applied to a first frequency band capable of being used as a dedicated frequency band to a second frequency band different from the first frequency band and is capable of communicating with a terminal apparatus by using the second frequency band and the second frequency band. The base station apparatus: adds at least signal null periods to a frame of a second signal transmitted using the second frequency band; and sets a frame length of a signal frame included in the frame of the second signal transmitted using the second frequency band to be less than a frame length of a signal frame included in the frame of the first signal transmitted using the first frequency band.

Claims

1. A base station apparatus that communicates with a terminal apparatus, the base station apparatus comprising:

a transmission unit that transmits a downlink signal to the terminal apparatus by performing carrier aggregation using one primary cell and one or a plurality of secondary cells,

wherein the primary cell is a component carrier of a licensed band, and at least one secondary cell is a component carrier of an unlicensed band,

a frame of the component carrier of the licensed band includes a signal transmission period,

a frame of the component carrier of the unlicensed band includes a plurality of signal transmission periods and a sensing period during which the base station apparatus does not transmit a signal,

the sensing period is configured to be present between the signal transmission periods in the component carrier of the unlicensed band,

a total of the plurality of signal transmission periods and the sensing period in the component carrier of the unlicensed band is equal to or less than the signal transmission period in the component carrier of the licensed band,

the component carrier of the unlicensed band includes a plurality of frame structures, and

priorities are configured for the plurality of frame structures.

2. The base station apparatus according to claim 1,

wherein the signal transmission period is 4 ms in the component carrier of the unlicensed band.

3. The base station apparatus according to claim 1,

wherein the frame of the component carrier of the unlicensed band includes a plurality of subframes, and

at least one subframe of the plurality of subframes includes the transmission period and the sensing period.

4. A terminal apparatus that communicates with a base station apparatus, the terminal apparatus comprising:

a reception unit that receives a downlink signal from the base station apparatus by performing carrier aggregation using one primary cell and one or a plurality of secondary cells,

wherein the primary cell is a component carrier of a licensed band, and at least one secondary cell is a component carrier of an unlicensed band,

a frame of the component carrier of the licensed band includes a signal transmission period,

a frame of the component carrier of the unlicensed band includes a plurality of signal transmission periods and a sensing period during which the base station apparatus does not transmit a signal,

the sensing period is configured to be present between the signal transmission periods in the component carrier of the unlicensed band,

a total of the plurality of signal transmission periods and the sensing period in the component carrier of the unlicensed band is equal to or less than the signal transmission period in the component carrier of the licensed band,

the component carrier of the unlicensed band includes a plurality of frame structures, and

priorities are configured for the plurality of frame structures.

5. A communication method used in a base station apparatus that communicates with a terminal apparatus, the communication method comprising:

a transmission step of transmitting a downlink signal to the terminal apparatus by performing carrier aggregation using one primary cell and one or a plurality of secondary cells,

wherein the primary cell is a component carrier of a licensed band, and at least one secondary cell is a component carrier of an unlicensed band,

a frame of the component carrier of the licensed band includes a signal transmission period,

a frame of the component carrier of the unlicensed band includes a plurality of signal transmission periods and a sensing period during which the base station apparatus does not transmit a signal,

the sensing period is configured to be present between the signal transmission periods in the component carrier of the unlicensed band,

a total of the plurality of signal transmission periods and the sensing period in the component carrier of the unlicensed band is equal to or less than the signal transmission period in the component carrier of the licensed band,

the component carrier of the unlicensed band includes a plurality of frame structures, and

priorities are configured for the plurality of frame structures.

6. A communication method used in a terminal apparatus that communicates with a base station apparatus, the communication method comprising:

a reception step of receiving a downlink signal from the base station apparatus by performing carrier aggregation using one primary cell and one or a plurality of secondary cells,

wherein the primary cell is a component carrier of a licensed band, and at least one secondary cell is a component carrier of an unlicensed band,

a frame of the component carrier of the licensed band includes a signal transmission period,

a frame of the component carrier of the unlicensed band includes a plurality of signal transmission periods and a sensing period during which the base station apparatus does not transmit a signal,

the sensing period is configured to be present between the signal transmission periods in the component carrier of the unlicensed band,

a total of the plurality of signal transmission periods and the sensing period in the component carrier of the unlicensed band is equal to or less than the signal transmission period in the component carrier of the licensed band,

the component carrier of the unlicensed band includes a plurality of frame structures, and

priorities are configured for the plurality of frame structures.