Method and apparatus for determining number of HARQ processes in wireless communication system

• US 10,567,120 B2
• Filed: 07/26/2018
• Issued: 02/18/2020
• Est. Priority Date: 12/18/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Dongyoun, Ahn, Joonkui, Yang, Suckchel, Yi, Yunjung, Hwang, Daesung
• Primary Examiner(s): Phillips, Hassan A
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US16/046,741
• Publication Number:
  US 20180331809A1
• Time in Patent Office: 572 Days
• Field of Search: None
• CPC Class Codes: H04B 7/15557 Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• 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: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 84/025 with acknowledge back capability

Abstract

Provided are a method for determining the number of hybrid automatic repeat request (HARQ) processes in a carrier aggregated system configured with a plurality of serving cells, and an apparatus using such a method. The method receives data from a downlink subframe of a second serving cell, and transmits an ACK/NACK signal for the data from an uplink subframe of a first serving cell, wherein the first serving cell uses a first-type frame, the second serving cell uses a second-type frame, and the number of HARQ processes in the second serving cell are determined with respect to each subframe comprised in the second-type frame and on the basis of the number of downlink subframes comprised in each section comprising a set number of subframes.

Claims

1. A method for performing hybrid automatic repeat request (HARQ) processes in a carrier aggregation system with which a plurality of serving cells including a primary cell and a secondary cell are configured, the method performed by a user equipment (UE) and comprising:

receiving a signal;

determining a number of HARQ processes of the secondary cell among the plurality of serving cells based on the signal; and

receiving physical downlink shared channels (PDSCHs) related to the HARQ processes on the secondary cell,

wherein based on the signal informing a specific number, the UE determines the number of HARQ processes of the secondary cell as same as the specific number,

wherein based on the signal not informing the specific number, the UE determines the number of HARQ processes of the secondary cell as a predetermined value, and

wherein a bit field size of the signal informing the number of HARQ processes of the secondary cell is 4 regardless of a type of the secondary cell.

2. The method of claim 1, further comprising:

transmitting acknowledgement/negative acknowledgement (ACK/NACK) information for data received in one of the PDSCHs.

3. The method of claim 1, further comprising:

wherein data is received through one of the PDSCHs in a downlink subframe of the secondary cell and acknowledgement/negative-acknowledgement (ACK/NACK) information for the data is transmitted in an uplink subframe of a primary cell.

4. The method of claim 1, wherein the uplink subframe is determined by ACK/NACK timing of the primary cell.

5. The method of claim 1, wherein the type of the secondary cell includes a frequency division duplex (FDD) cell and a time division duplex (TDD) cell.

6. A user equipment (UE), configured with a plurality of serving cells including a primary cell and a secondary cell, comprising:

a transceiver configured to transmit and receive a radio signal; and

a processor connected to the transceiver,

wherein the processor is configured to;

receive a signal,

determine a number of HARQ processes of the secondary cell among the plurality of serving cells based on the signals; and

receiving physical downlink shared channels (PDSCHs) related to the HARQ processes on the secondary cell,

wherein based on the signal informing a specific number, the UE determines the number of HARQ processes of the secondary cell as same as the specific number,

wherein based on the signal not informing the specific number, the UE determines the number of HARQ processes of the secondary cell as a predetermined value, and

wherein a bit field size of the signal informing the number of HARQ processes of the secondary cell is 4 regardless of a type of the secondary cell.

7. The UE of claim 6, the processor is further configured to:

transmit acknowledgement/negative acknowledgement (ACK/NACK) information for data received in one of the PDSCHs.

8. The UE of claim 6, wherein data is received through one of the PDSCHs in a downlink subframe of the secondary cell and acknowledgement/negative-acknowledgement (ACK/NACK) information for the data is transmitted in an uplink subframe of a primary cell.

9. The UE of claim 6, wherein the uplink subframe is determined by ACK/NACK timing of the primary cell.

10. The UE of claim 6, wherein the type of the secondary cell includes a frequency division duplex (FDD) cell and a time division duplex (TDD) cell.