Method for retransmitting data in the multi-carrier system

• US 7,873,007 B2
• Filed: 09/23/2009
• Issued: 01/18/2011
• Est. Priority Date: 10/02/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Eun Sun, Kim, Ki Jun, Yun, Young Woo, Ahn, Joon Kui, Yoon, Suk Hyon, Kim, Hak Seong, Lee, Dae Won
• Primary Examiner(s): NGUYEN, STEVEN H D
• Application Number:
  US12/565,599
• Publication Number:
  US 20100074211A1
• Time in Patent Office: 482 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 2001/125 Arrangements for preventing errors in the return channel
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems

Abstract

A method for modifying a synchronous non-adaptive retransmission scheme to solve the limitation of the synchronous non-adaptive retransmission scheme is disclosed. A method for indicating not only the new data transmission but also the retransmission using a data scheduling message is disclosed. A method for determining whether there is an error in the ACK signal transmitted from a data reception end using another message to -be received later is disclosed. The retransmission method for a multi-carrier system includes: receiving a grant message including scheduling information for transmitting uplink data wherein a retransmission scheme for the uplink data is predetermined by a first retransmission scheduling, transmitting the uplink data according to the scheduling information and retransmitting the uplink data according to second retransmission scheduling by receiving the second retransmission scheduling information associated with the uplink data with retransmission request.

Claims

1. A method of data retransmission in a multi carrier system, the method comprising:

(a) receiving, by a user equipment, a first grant message including a first New Data Indicator (NDI) and first resource allocation information for an uplink data transmission, wherein the first NDI indicates whether new data is transmitted or retransmitted;

(b) transmitting the uplink data according to the first resource allocation information;

(c) receiving an acknowledgement message representing whether the uplink data is successfully received;

(d-0) adaptively retransmitting the uplink data using second resource allocation information when a second grant message, including the second resource allocation information for the uplink data retransmission and a second NDI which is not toggled compared with the first NDI, is further received at the step of (c); and

(d-1) non-adaptively retransmitting the uplink data using the first resource allocation information when the second grant message is not received and the acknowledgment message is a negative acknowledgement (NACK) message.

2. The method according to claim 1, wherein:

the first resource allocation information includes a first transmission timing, a first transmission resource block, a number of the first transmission resource block, and first MCS (Modulation and Coding Scheme) information; and

the second resource allocation information includes a second transmission timing, a second transmission resource block, a number of the second transmission resource block, and a second MCS (Modulation and Coding Scheme) information.

3. The method according to claim 2, wherein the second grant message further includes redundancy version information for retransmission.

4. The method according to claim 1, wherein when the acknowledgement message is detected as a positive acknowledgement message at the step of (c),

the (d-0) step further comprising:

determining the positive acknowledgement message as the negative acknowledgement message when the second grant message, including the second NDI which is not toggled compared with the first NDI, is received.

5. The method according to claim 1, wherein a value of the second NDI is toggled compared to a value of the first NDI, when the second NDI indicates new data transmission.

6. The method according to claim 4, wherein the second NDI is initialized when the second NDI indicates a new data transmission, and the second NDI is changed according to predetermined rules when the second NDI indicates a retransmission.

7. A method of data retransmission in a multi carrier system, the method comprising:

(a) transmitting, to a User Equipment (UE), a first grant message including a first New Data Indicator (NDI) and first resource allocation information for an uplink data transmission, wherein the first NDI indicates whether new data is transmitted or retransmitted;

(b) receiving, from the UE, the uplink data according to the first resource allocation information;

(c) transmitting, to the UE, an acknowledgement message representing whether the uplink data is successfully received;

(d-0) receiving the uplink data which is adaptively retransmitted by the UE using second resource allocation information when a second grant message, including the second resource allocation information for the uplink data retransmission and a second NDI of which value is not toggled compared with a value of the first NDI, is further transmitted at the step of (c); and

(d-1) receiving the uplink data which is non-adaptively retransmitted by the UE using the first resource allocation information when the acknowledgement message is a negative acknowledgement message.

8. The method according to claim 7, wherein:

the first resource allocation information includes a first transmission timing, a first transmission resource block, a number of the first transmission resource block, and first MCS (Modulation and Coding Scheme) information; and

the second resource allocation information includes a second transmission timing, a second transmission resource block, a number of the second transmission resource block, and second MCS (Modulation and Coding Scheme) information.

9. The method according to claim 8, wherein the second grant message further includes redundancy version information for the data retransmission.