METHOD FOR BASE STATION TRANSMITTING DOWNLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR SAME

• US 20160198490A1
• Filed: 03/17/2016
• Published: 07/07/2016
• Est. Priority Date: 08/19/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SEO, Hanbyul, KIM, Byounghoon, KIM, Kijun, KIM, Hakseong
• Granted Patent: US 9,736,856 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 88/16 Gateway arrangements

Abstract

In the present invention, a method for a base station transmitting a downlink channel is disclosed. More particularly, the method comprises the steps of: dividing each of one or more resources blocks, which are allocated for the downlink control channel, into a predetermined number of subsets; deciding the number of subsets that comprise a resource allocation basic unit for the downlink control channel, based on a start symbol and/or an end symbol of the downlink control channel; mapping a transmission resource on the downlink control channel as the resource allocation basic unit comprising the predetermined number of subsets; and transmitting the downlink control channel by using the transmission resource that is mapped.

Claims

1. A method for transmitting an enhanced physical downlink control channel (EPDCCH) to a user equipment (UE) at a base station (BS) in a wireless communication system, the method comprising;

determining a number of enhanced control channel elements (ECCEs) that form an aggregation unit for the EPDCCH, based on whether a downlink bandwidth is equal to or larger than a first threshold value or whether a number of available resources for the EPDCCH is smaller than a second threshold value; and

transmitting the EPDCCH using one or more aggregation units to the UE.

2. The method of claim 1, wherein each of the one or more aggregation units is configured with the determined number of ECCEs.

3. The method of claim 1, wherein a number of aggregation units used for transmitting the EPDCCH is determined based on an aggregation level of the downlink control channel.

4. The method of claim 1, wherein:

if the downlink bandwidth is equal to or larger than the first threshold value or if the number of available resources for the EPDCCH is smaller than the second threshold value, the number of the ECCEs is determined to be a value larger than 1; and

otherwise, the number of the ECCEs is determined to be 1.

5. The method of claim 1, wherein the number of available resources for the EPDCCH is determined according to a number of resource elements for reference signals and an index of starting symbol of the EPDCCH.

6. A base station (BS) in a wireless communication system, the BS comprising:

a processor configured to determine a number of enhanced control channel elements (ECCEs) that form an aggregation unit for an enhanced physical downlink control channel (EPDCCH), based on whether a downlink bandwidth is equal to or larger than a first threshold value or whether a number of available resources for the EPDCCH is smaller than a second threshold value; and

a Radio Frequency module configured to transmit the EPDCCH using one or more aggregation units to a user equipment (UE).

7. The BS of claim 6, wherein each of the one or more aggregation units is configured with the determined number of ECCEs.

8. The BS of claim 6, wherein a number of aggregation units used for transmitting the EPDCCH is determined based on an aggregation level of the downlink control channel.

9. The BS of claim 6, wherein:

if the downlink bandwidth is equal to or larger than the first threshold value or if the number of available resources for the EPDCCH is smaller than the second threshold value, the processor determines the number of the ECCEs to be a value larger than 1; and

otherwise, the processor determines the number of the ECCEs to be 1.

10. The BS of claim 6, wherein the number of available resources for the EPDCCH is determined according to a number of resource elements for reference signals and an index of starting symbol of the EPDCCH.