METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20150319777A1
• Filed: 12/18/2013
• Published: 11/05/2015
• 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
• Granted Patent: US 10,419,168 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 and an apparatus for transmitting downlink control information in a wireless communication system configured with a plurality of serving cells. The method generates downlink control information scheduling frequency division duplex (FDD) cells by means of FDD frames (DCI_FDD) and downlink control information scheduling time division duplex (TDD) cells by means of TDD frames (DCI_TDD), and transmits the DCI_FDD and the DCI_TDD, wherein parts of the fields of DCI_FDD and DCI_TDD are generated to have equal bit sizes, and if the FDD or TDD cell is used exclusively, then said parts of the fields in the FDD and TDD cells have mutually different bit sizes.

Claims

1. A method of transmitting downlink control information (DCI) in a wireless communication system in which a plurality of serving cells are configured, the method comprising:

generating DCI for scheduling frequency division duplex (FDD) cells using FDD frames (DCI_FDD) and DCI for scheduling time division duplex (TDD) cells using TDD frames (DCI_TDD), and

transmitting the DCI_FDD and the DCI_TDD,

wherein some fields of the DCI_FDD and DCI_TDD are generated to have the same bit size, and

if the FDD or TDD cell is used exclusively, the some fields are fields having different bit sizes in the FDD cell and the TDD cell.

2. The method of claim 1,

wherein the FDD cell is a primary cell in which a terminal performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station, and

wherein the TDD cell is a secondary cell which is additionally allocated to the terminal in addition to the primary cell.

3. The method of claim 2, wherein ACK/NACK for data received in the TDD cell is transmitted in the FDD cell, and transmission timing of the ACK/NACK complies with ACK/NACK transmission timing of the FDD cell.

4. The method of claim 3, wherein the DCI_TDD does not include a downlink assignment index (DAI).

5. The method of claim 3, wherein the DCI_TDD includes a 3-bit hybrid automatic repeat request (HARQ) process number field.

6. The method of claim 1,

wherein the TDD cell is a primary cell in which a terminal performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station, and

wherein the FDD cell is a secondary cell which is additionally allocated to the terminal in addition to the primary cell.

7. The method of claim 6, wherein ACK/NACK for data received in the FDD cell is transmitted in the TDD cell, and transmission timing of the ACK/NACK complies with ACK/NACK transmission timing of the TDD cell.

8. The method of claim 7, wherein the DCI_FDD includes a DAI.

9. The method of claim 8, wherein the DCI_FDD includes a 4-bit HARQ process number field.

10. The method of claim 1, wherein both of the DCI_FDD and the DCI_TDD include a DAI having the same number of bits.

11. The method of claim 4, wherein the DAI included in the DCI_FDD is used as a virtual cyclic redundancy check (CRC) for error detection.

12. The method of claim 1, wherein both of the DCI_TDD and the DCI_FDD do not include a DAI.

13. The method of claim 1, wherein the DCI_FDD includes an HARQ process number field having the same number of bits as the HARQ process number field included in the DCI_TDD.

14. The method of claim 1, wherein whether a sounding reference signal (SRS) request field is included is equally configured in the DCI_FDD and the DCI_TDD.

15. The method of claim 1, wherein the DCI_FDD and the DCI_TDD are transmitted in a common search space.

16. The method of claim 1, wherein the DCI_FDD and the DCI_TDD have the same bit size as to some DCI formats among a plurality of DCI formats.

17. An apparatus comprising:

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

a processor operatively coupled to the RF unit,

wherein the processor is configured for generating DCI for scheduling frequency division duplex (FDD) cells using FDD frames (DCI_FDD) and DCI for scheduling time division duplex (TDD) cells using TDD frames (DCI_TDD), and transmitting the DCI_FDD and the DCI_TDD, wherein some fields of the DCI_FDD and DCI_TDD are generated to have the same bit size, and if the FDD or TDD cell is used exclusively, the some fields are fields having different bit sizes in the FDD cell and the TDD cell.