METHOD AND APPARATUS FOR PERFORMING HARQ PROCESSES IN CARRIER AGGREGATION SYSTEMS

• US 20160072612A1
• Filed: 02/08/2013
• Published: 03/10/2016
• Est. Priority Date: 02/09/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: Dongyoun Seo
• Inventors: SEO, Dongyoun
• Granted Patent: US 9,838,162 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

Abstract

The present invention relates to a method for managing a soft buffer for the hybrid automatic repeat request (HARQ) of a terminal to which a plurality of cells are set in a wireless communication system, and to an apparatus using the method. Through the method, information is received about the maximum number of cells capable of being simultaneously scheduled from among a plurality of cells, and the size of the soft buffer is determined for storing transmission blocks or code blocks of each cell on the basis of the information.

Claims

1. A method of managing a soft buffer for a hybrid automatic repeat request (HARQ) of a user equipment configured with a plurality of cells in a wireless communication system, the method comprising:

receiving information regarding the maximum number of cells that can be scheduled simultaneously among the plurality of cells; and

determining a size of the soft buffer for storing a transmission block or code block of each cell on the basis of the information.

2. The method of claim 1, wherein the size of the soft buffer for storing the transmission block or the code bock is determined on the basis of the maximum number of effective HARQ processes for each cell with respect to cells corresponding to the maximum number of cells that can be scheduled simultaneously.

3. The method of claim 1, wherein the plurality of cells include a primary cell group consisting of cells that can be scheduled simultaneously and a non-primary cell group consisting of the remaining other cells.

4. The method of claim 3, wherein the information regarding the maximum number of cells that can be scheduled simultaneously indicates the number of cells that can be scheduled simultaneously among cells included in the non-primary cell group.

5. The method of claim 3, wherein the size of the soft buffer for the cells included in the primary cell group uses a pre-determined value.

6. The method of claim 3, wherein the cell included in the primary cell group is a cell for which the user equipment performs an initial connection establishment process or a connection re-establishment process with respect to a base station.

7. The method of claim 3, wherein the non-primary cell group includes a plurality of subgroups, and only one of cells included in each subgroup can be scheduled simultaneously.

8. The method of claim 1, wherein the information is received through a radio resource control (RRC) message.

9. A user equipment comprising:

a radio frequency (RF) unit for transmitting or receiving a radio signal; and

a processor operatively coupled to the RF unit,

wherein the processor is configured for;

receiving information regarding the maximum number of cells that can be scheduled simultaneously among the plurality of cells; and

determining a size of the soft buffer for storing a transmission block or code block of each cell on the basis of the information.