HARQ operation method for retransmitted data

• US 8,670,377 B2
• Filed: 01/05/2009
• Issued: 03/11/2014
• Est. Priority Date: 01/04/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck
• Primary Examiner(s): MURPHY, RHONDA L
• Application Number:
  US12/811,613
• Publication Number:
  US 20110044243A1
• Time in Patent Office: 1,891 Days
• Field of Search: None
• US Class Current: 370/328
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]

Abstract

Disclosed is the radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, to a method of processing retransmitted data effectively so as to minimize a data loss during a HARQ (Hybrid Automatic Repeat reQuest) operation in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from the Universal Mobile Telecommunications System (UMTS) or a Long Term Evolution (LTE) system.

Claims

1. A method processing data for a Hybrid Automatic Repeat Request (HARQ) operation in a wireless communication system, the method comprising:

receiving a first data transmission indicator and a first data from a network;

decoding the first received data;

transmitting a positive response message to the network if the first received data is successfully decoded;

receiving a second data transmission indicator and a second data from the network after transmitting the positive response message; and

decoding the second received data if the first and second data transmission indicator have a same value and the first and second received data have a different data size to each other, or discarding the second received data if the first and second data transmission indicator have a same value and the first and second received data have a same data size.

2. The method of claim 1, wherein the first data transmission indicator and/or the second data transmission indicator is received by a New Data Indicator (NDI) field included in a Physical Downlink Control Channel (PDCCH).

3. The method of claim 2, wherein the NDI field has 1 bit field.

4. The method of claim 1, wherein the positive response message is an Acknowledgement (ACK) message.

5. The method of claim 1, further comprising:

delivering the second data to an upper layer if the second received data is successfully decoded, and transmitting the positive response message to the network.

6. The method of claim 5, wherein the successfully decoded second data is discarded if it is determined to be duplicated data by a duplicated detection function in the upper layer.

7. The method of claim 1, further comprising:

storing the second data into a soft buffer if the second received data is not successfully decoded, and transmitting a negative response message to the network.