Method for base station transmitting downlink control channel in wireless communication system and apparatus for same

• US 10,349,435 B2
• Filed: 11/15/2017
• Issued: 07/09/2019
• 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
• Primary Examiner(s): Aung, Sai
• Application Number:
  US15/813,716
• Publication Number:
  US 20180084571A1
• Time in Patent Office: 601 Days
• 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 receiving a downlink control channel from a base station (BS) at a user equipment (UE) in a wireless communication system, the method comprising;

determining a minimum number of resource units for aggregation by comparing a downlink bandwidth with a threshold value related to the downlink bandwidth; and

receiving, from the BS, the downlink control channel using an aggregation of one or more of the determined minimum number of resource units,

wherein, when the downlink bandwidth is equal to or larger than the threshold value, the minimum number of the resource units is determined to be 2,

wherein, when the downlink bandwidth is smaller than the threshold value, the minimum number of the resource units is determined to be 1.

2. The method of claim 1, wherein the downlink control channel is an enhanced physical downlink control channel (EPDCCH) and the resource unit is an enhanced control channel element (ECCE).

3. A user equipment (UE) in a wireless communication system, the UE comprising:

a Radio Frequency (RF) unit;

a processor connected with the RF unit and configured to

determine a minimum number of resource units for aggregation by comparing a downlink bandwidth with a threshold value related to the downlink bandwidth; and

receive, from a base station (BS), a downlink control channel using an aggregation of one or more of the determined minimum number of resource units,

wherein, when the downlink bandwidth is equal to or larger than the threshold value, the minimum number of the resource units is determined to be 2,

wherein, when the downlink bandwidth is smaller than the threshold value, the minimum number of the resource units is determined to be 1.

4. The UE of claim 3, wherein the downlink control channel is an enhanced physical downlink control channel (EPDCCH) and the resource unit is an enhanced control channel element (ECCE).

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

determining a minimum number of resource units for aggregation by comparing a downlink bandwidth with a threshold value related to the downlink bandwidth; and

transmitting the downlink control channel using an aggregation of one or more of the determined minimum number of resource units to the UE,

wherein, when the downlink bandwidth is equal to or larger than the threshold value, the minimum number of the resource units is determined to be 2,

wherein, when the downlink bandwidth is smaller than the threshold value, the minimum number of the resource units is determined to be 1.

6. The method of claim 5, wherein the downlink control channel is an enhanced physical downlink control channel (EPDCCH) and the resource unit is an enhanced control channel element (ECCE).

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

a Radio Frequency (RF) unit;

a processor connected with the RF unit and configured to;

determine a minimum number of resource units for aggregation by comparing a downlink bandwidth with a threshold value related to the downlink bandwidth;

transmit a downlink control channel using an aggregation of one or more of the determined minimum number of resource units from a user equipment (UE),

wherein, when the downlink bandwidth is equal to or larger than the threshold value, the minimum number of the resource units is determined to be 2,

wherein, when the downlink bandwidth is smaller than the threshold value, the minimum number of the resource units is determined to be 1.

8. The BS of claim 7, wherein the downlink control channel is an enhanced physical downlink control channel (EPDCCH) and the resource unit is an enhanced control channel element (ECCE).