TRANSMISSION/RECEPTION METHOD AND APPARATUS FOR UPLINK MIMO RETRANSMISSION IN LTE SYSTEM

• US 20120076078A1
• Filed: 09/29/2011
• Published: 03/29/2012
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: HAN, Jin-Kyu, Kim, Youn Sun
• Granted Patent: US 9,237,561 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A transmission/reception method and apparatus for a mobile communication system supporting uplink MIMO is provided. In the transmission method, a User Equipment (UE) transmits two transport blocks according to a predetermined number of layers and respective precoding indices, an evolve Node B (eNB) transmits, when one of the transport blocks is lost, a negative acknowledgement for the lost transport block, and the UE sets a precoding index for the lost transport block to a predetermined value to retransmit the lost transport block while maintaining the number of layers.

Claims

1. A transmission method of a terminal supporting Uplink Multiple Input Multiple Output (UL MIMO), the method comprising the steps of:

transmitting two transport blocks according to a predetermined number of layers; and

setting a precoding index for a lost transport block to a predetermined value, when one of the two transport blocks is lost.

2. The transmission method of claim 1, wherein setting the precoding index comprises maintaining the number of layers.

3. The transmission method of claim 1, further comprising:

when both of the two transport blocks are lost, maintaining precoding indices used for transmission of the two transport blocks; and

retransmitting the two transport blocks using the precoding indices.

4. The transmission method of claim 1, wherein the predetermined value is 0.

5. A reception method of a base station supporting Uplink Multiple Input Multiple Output (UL MIMO), the method comprising the steps of:

scheduling reception of two transport blocks according to a predetermined number of layers;

transmitting a negative acknowledgement for a lost transport block, when one of the two transport blocks is lost; and

setting a precoding index for receiving a retransmission of the lost transport block to a predetermined value.

6. The reception method of claim 5, wherein setting the precoding index comprises maintaining the number of layers.

7. The reception method of claim 5, further comprising:

when both of the two transport blocks are lost, maintaining precoding indices used for receiving the two transport blocks; and

receiving the retransmission of the two transport blocks using the precoding indices.

8. A transmitter of a terminal supporting Uplink Multiple Input Multiple Output (UL MIMO), comprising:

a Radio Frequency (RF) processor that transmits two transport blocks to a base station according to a predetermined number of layers; and

a controller that sets a precoding index for a lost transport block to a predetermined value, when one of the two transport blocks is lost.

9. The transmitter of claim 8, wherein the controller maintains the number of layers for retransmission of the lost transport block.

10. The transmitter of claim 8, wherein the controller maintains precoding indices used for transmission of the two transport blocks and retransmits the two transport blocks using the precoding indices, when both of the two transport blocks are lost.

11. The transmitter of claim 8, wherein the predetermined value is 0.

12. A receiver of a base station supporting Uplink Multiple Input Multiple Output (UL MIMO), comprising:

a controller that performs scheduling for reception of two transport blocks according to a predetermined number of layers; and

a Radio Frequency (RF) processor that transmits a negative acknowledgement for a lost transport block, when one of the two transport blocks is lost;

wherein the controller sets a precoding index for reception of a retransmission of the lost transport block to a predetermined value.

13. The receiver of claim 12, wherein the controller maintains the number of layers for reception of the retransmission of the lost transport block.

14. The receiver of claim 12, wherein the controller maintains precoding indices used for receiving the tow transport blocks and receives the retransmission of the two transport blocks using the precoding indices, when both of the two transport blocks are lost.