Method for transreceiving signal and apparatus for same

• US 9,397,814 B2
• Filed: 02/12/2013
• Issued: 07/19/2016
• Est. Priority Date: 02/09/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suckchel, Seo, Dongyoun, Kim, Bonghoe, Ahn, Joonkui
• Primary Examiner(s): Huq, Obaidul
• Application Number:
  US14/376,332
• Publication Number:
  US 20150009872A1
• Time in Patent Office: 1,253 Days
• Field of Search: 370/229, 370/230, 370/231, 370/235, 370/276, 370/277, 370/278, 370/280, 370/282, 370/310, 370/328, 370/338, 370/351, 370/428, 455/403, 455/422.1
• US Class Current: 1/1
• CPC Class Codes: H04J 3/00 Time-division multiplex systems H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q
• 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 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Hybrid automatic repeat request (HARQ) for carrier aggregation, that involves setting a first cell having a first time division duplex (TDD) uplink-downlink (UL-DL) configuration and a second cell having a second TDD UL-DL configuration; receiving data through a DL subframe of the first cell; and saving at least a portion of the data to a HARQ soft buffer when decoding is unsuccessful. The size of the HARQ soft buffer is determined based on the number of HARQ processes of the first cell, which, in turn, is determined based on the number of subframes of which the first cell is the DL within a specific HARQ round trip time, wherein at least one subframe of which the first cell is the DL and the second cell is the UL is excluded when determining the number of the HARQ processes.

Claims

1. A method for carrying out hybrid automatic repeat request (HARQ) in a long-term evolution (LTE) wireless communication system supporting carrier aggregation, the method comprising:

setting a secondary cell having a first time division duplex (TDD) uplink-downlink (UL-DL) configuration and a primary cell having a second TDD UL-DL configuration different from the first TDD UL-DL configuration;

receiving data through a DL subframe of the secondary cell, wherein the data is scheduled by control information of the primary cell; and

storing at least a portion of the data in a HARQ soft buffer when decoding of the data fails,

wherein a size of soft channel bits in the HARQ soft buffer is determined by using the following expression;

2. The method according to claim 1, wherein subframe configurations according to TDD UL-DL configurations are defined as follows

3. A communication apparatus configured to carry out HARQ in a long-term evolution (LTE) wireless communication system supporting carrier aggregation, comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to set a secondary cell having a first TDD UL-DL configuration and a primary cell having a second TDD UL-DL configuration different from the first TDD UL-DL configuration, to receive data through a DL subframe of the secondary cell, wherein the data is scheduled by control information of the primary cell, and to store at least a portion of the data in a HARQ soft buffer when decoding of the data fails,

wherein a size of soft channel bits in the HARQ soft buffer is determined by using the following expression;

4. The communication apparatus according to claim 3, wherein subframe configurations according to TDD UL-DL configurations are defined as follows