METHOD AND APPARATUS FOR ACQUIRING DIVERSITY GAIN ACCORDING TO DISTRIBUTED RESOURCE ALLOCATION FOR DOWNLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM

• US 20150181569A1
• Filed: 01/14/2013
• Published: 06/25/2015
• Est. Priority Date: 07/23/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Myoungseob, Seo, Hanbyul, Chae, Hyukjin, Seo, Inkwon, Lee, Seungmin
• Granted Patent: US 9,854,571 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

In the present invention, disclosed is a method for a base station transmitting a downlink control channel to user equipment in a wireless communication system. More specifically, the method comprises the steps of configuring resource elements, which are included in each of a plurality of resource blocks, as a plurality of resource element groups comprising a predetermined number of resource elements; allocating antenna ports to the resource elements which are included in each of the plurality of resource element groups; allocating as a transmission resource for the downlink control channel, at least one resource element group from each of the plurality of resource blocks; and transmitting the downlink control channel to the user equipment by using the transmission resource.

Claims

1. A method for transmitting a downlink control channel to a user equipment (UE) by a base station (BS) in a wireless communication system, comprising:

allowing each of resource elements (REs) contained in each of resource blocks (RBs) to be composed of a plurality of resource element (RE) groups each having a predetermined number of resource elements (REs);

allocating antenna ports to resource elements (REs) contained in each resource element (RE) group;

allocating at least one resource element (RE) group in each of the plurality of resource blocks (RBs) to transmission (Tx) resources for the downlink control channel; and

transmitting the downlink control channel to the user equipment (UE) using the transmission (Tx) resources.

2. The method according to claim 1, wherein the antenna port indexes allocated to respective start resource elements contained in each resource element (RE) group are cyclically increased or reduced according to indexes of the resource element (RE) groups.

3. The method according to claim 1, wherein the allocating the antenna ports includes:

allocating antenna port indexes to the individual resource blocks (RBs) in such a manner that the antenna port indexes are cyclically increased or reduced with respect to all or some of resource elements (REs) contained in the plurality of resource blocks (RBs).

4. The method according to claim 1, wherein the indexes of resource element (RE) groups allocated to the transmission (Tx) resources are cyclically increased or reduced according to indexes of the resource blocks (RBs).

5. The method according to claim 1, wherein:

if the plurality of resource element (RE) groups allocated to the transmission (Tx) resources is constructed in the same resource block (RB), indexes of the plurality of resource element (RE) groups are contiguous to each other.

6. The method according to claim 1, wherein the number of resource elements (REs) contained in the respective resource element (RE) groups is a constant number.

7. The method according to claim 1, wherein the number of resource elements (REs) contained in the respective resource element (RE) groups is changed according to a reference signal contained in a subframe through which the downlink control channel is transmitted and categories of other downlink control channels.

8. A base station (BS) device for use in a wireless communication system, comprising:

a processor to allow each of resource elements (REs) contained in each of resource blocks (RBs) to be composed of a plurality of resource element (RE) groups each having a predetermined number of resource elements (REs), to allocate antenna ports to resource elements (REs) contained in each resource element (RE) group, and to allocate at least one resource element (RE) group in each of the plurality of resource blocks (RBs) to transmission (Tx) resources for a downlink control channel; and

a wireless communication module to transmit the downlink control channel to the user equipment (UE) using the transmission (Tx) resources.

9. The base station (BS) device according to claim 8, wherein the antenna port indexes allocated to respective start resource elements contained in each resource element (RE) group are cyclically increased or reduced according to indexes of the resource element (RE) groups.

10. The base station (BS) device according to claim 8, wherein the processor allocates antenna port indexes to the individual resource blocks (RBs) in such a manner that the antenna port indexes are cyclically increased or reduced with respect to all or some of resource elements (REs) contained in the plurality of resource blocks (RBs).

11. The base station (BS) device according to claim 8, wherein the indexes of resource element (RE) groups allocated to the transmission (Tx) resources are cyclically increased or reduced according to indexes of the resource blocks (RBs).

12. The base station (BS) device according to claim 8, wherein:

if the plurality of resource element (RE) groups allocated to the transmission (Tx) resources is constructed in the same resource block (RB), indexes of the plurality of resource element (RE) groups are contiguous to each other.

13. The base station (BS) device according to claim 8, wherein the number of resource elements (REs) contained in the respective resource element (RE) groups is a constant number.

14. The base station (BS) device according to claim 8, wherein the number of resource elements (REs) contained in the respective resource element (RE) groups is changed according to a reference signal contained in a subframe through which the downlink control channel is transmitted and categories of other downlink control channels.