Communication method in wireless communication system on basis of carrier aggregation

Patent metadata

Field	Value
Publication number	US-9986557-B2
Application number	US-201414905407-A
Country	US
Kind code	B2
Filing date	Jul 15, 2014
Priority date	Jul 16, 2013
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

Disclosed is a communication method in a wireless communication system on the basis of a carrier aggregation. The communication method on the basis of a carrier aggregation comprises the steps of: receiving a PDSCH from a base station via a subframe n of a TDD cell; and transmitting, to the base station, a PUCCH including a response to the PDSCH via a subframe n+4 of an FDD cell. Accordingly, an HARQ process may be performed efficiently.

First claim

The invention claimed is:

1. A communication method in a system in which a Frequency Division Duplexing (FDD) cell and a Time Division Duplexing (TDD) cell are aggregated, the method comprising:
receiving a grant for uplink data channel transmission of the FDD cell through a (n−k−l)-th downlink subframe or special subframe of the TDD cell, wherein n is an integer number equal to or larger than 0 and k and l are natural numbers;
transmitting an uplink data channel based on the grant for uplink data channel transmission through a (n−k)-th uplink subframe of the FDD cell; and
receiving an ACK or NACK for the uplink data channel through a n-th subframe of the TDD cell,
wherein n is a subframe index value indicating a position of a subframe in a frame of the TDD cell, and is one of 0 to 9,
wherein l is 4 according to a timing scheme of the FDD cell, and k is 6 for uplink/downlink configurations of the TDD cell, in order to guarantee the n-th subframe indicated by n to be a downlink subframe or a special subframe of the TDD cell and to guarantee a same HARQ round-trip time, regardless of a uplink/downlink configuration of the TDD cell.

2. The communication method of claim 1 , wherein the FDD cell is cross-carrier-scheduled by the TDD cell.

3. A communication method in a system in which a Frequency Division Duplexing (FDD) cell and a Time Division Duplexing (TDD) cell are aggregated, the method comprising:
transmitting a grant for uplink data channel transmission of the FDD cell through a (n−k−l)-th downlink subframe or special subframe of the TDD cell, wherein n is an integer number equal to or larger than 0 and k and l are natural numbers;
receiving an uplink data channel based on the grant for uplink data channel transmission through a (n−k)-th uplink subframe of the FDD cell; and
transmitting an ACK or NACK for the uplink data channel through a n-th subframe of the TDD cell,
wherein n is a subframe index value indicating a position of a subframe in a frame of the TDD cell, and is one of 0 to 9,
wherein l is 4 according to a timing scheme of the FDD cell, and k is 6 for uplink/downlink configurations of the TDD cell, in order to guarantee the n-th subframe indicated by n to be a downlink subframe or a special subframe of the TDD cell and to guarantee a same HARQ round-trip time, regardless of a uplink/downlink configuration of the TDD cell.

4. A communication method in a system in which a Frequency Division Duplexing (FDD) cell and a Time Division Duplexing (TDD) cell are aggregated, the method comprising:
receiving a NACK for an uplink data channel transmission of the FDD cell through a (n−k−l)-th downlink subframe or special subframe of the TDD cell, wherein n is an integer number equal to or larger than 0 and k and l are natural numbers;
transmitting an uplink data channel based on the NACK through a (n−k)-th uplink subframe of the FDD cell; and
receiving an ACK or NACK for the uplink data channel through a n-th subframe of the TDD cell,
wherein n is a subframe index value indicating a position of a subframe in a frame of the TDD cell, and is one of 0 to 9,
wherein l is 4 according to a timing scheme of the FDD cell, and k is 6 for uplink/downlink configurations of the TDD cell, in order to guarantee the n-th subframe indicated by n to be a downlink subframe or a special subframe of the TDD cell and to guarantee a same HARQ round-trip time, regardless of a uplink/downlink configuration of the TDD cell.

5. The communication method of claim 4 , wherein the FDD cell is cross-carrier-scheduled by the TDD cell.

6. A communication method in a system in which a Frequency Division Duplexing (FDD) cell and a Time Division Duplexing (TDD) cell are aggregated, the method comprising:
transmitting a NACK for an uplink data channel transmission of the FDD cell through a (n−k−l)-th downlink subframe or special subframe of the TDD cell, wherein n is an integer number equal to or larger than 0 and k and l are natural numbers;
receiving an uplink data channel based on the NACK through a (n−k)-th uplink subframe of the FDD cell; and
transmitting an ACK or NACK for the uplink data channel through a n-th subframe of the TDD cell,
wherein n is a subframe index value indicating a position of a subframe in a frame of the TDD cell, and is one of 0 to 9,
wherein l is 4 according to a timing scheme of the FDD cell, and k is 6 for uplink/downlink configurations of the TDD cell, in order to guarantee the n-th subframe indicated by n to be a downlink subframe or a special subframe of the TDD cell and to guarantee a same HARQ round-trip time, regardless of a uplink/downlink configuration of the TDD cell.

7. A communication method in a system in which a Frequency Division Duplexing (FDD) cell and a Time Division Duplexing (TDD) cell are aggregated, the method comprising:
receiving a grant for uplink data channel transmission of the TDD cell through a n-th downlink subframe of the FDD cell, wherein n is an integer number equal to or larger than 0;
transmitting an uplink data channel based on the grant for uplink data channel transmission through a (n+k)-th uplink subframe of the TDD cell, wherein k is a natural number; and
receiving an ACK or NACK for the uplink data channel through a (n+k+l)-th downlink subframe of the FDD cell, wherein l is a natural number,
wherein n is a subframe index value indicating a position of a subframe in a frame of the TDD cell, and is one of 0 to 9,
wherein k is determined according to a subframe index value of the n-th subframe and an uplink-downlink configuration of the TDD cell based on a following table

UL-DL
Subframe index value of the n-th subframe

configuration
0
1
2
3
4
5
6
7
8
9

1

6

4

6

4

2

4

4

3
4

4
4

4

4
4

5

4

6
7
7

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Moon Sung Hyun
• Ko Young Jo
• Ahn Jae Young
• Kim Cheul Soon
• Shin Joon Woo

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04L1/1861

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title

• H04W72/0406

  Electricity · mapped topic

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title