# US 10,321,454 B2 · Method for monitoring downlink control channel in wireless communication system and device for same

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- Number: US 10,321,454 B2
- Document ID: US10321454B2
- Status: Granted
- Kind: B2
- Application number: 14/758,758
- Filed: 2014-01-02
- Published: 2015-12-10
- Granted: 2019-06-11
- Earliest claimed: 2013-01-01
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seungmin Lee; Inkwon Seo; Hanbyul Seo
- Web page: https://patentgrep.com/patent/US10321454B2

## CPC

- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/1469: {using time-sharing}
- H04L 12/18: for broadcast or conference {, e.g. multicast}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present invention relates to a method and a device by which a user equipment monitors a downlink control channel in a wireless communication system. More specifically, the method comprises a step of monitoring the downlink control channel on a flexible downlink subframe, wherein the flexible downlink subframe is obtained by reconfiguring, for downlink communication, an uplink subframe configured according to a reference UL-DL configuration, the reference UL-DL configuration is configured by the combination of a first UL-DL configuration set for a first cell and a second UL-DL configuration set for a second cell, and the first UL-DL configuration and the second UL-DL configuration are configured so as to change the usage of wireless resources.

## Claims

### Claim 1

A method of monitoring a downlink control channel of a user equipment (UE) in a wireless communication system, the method comprising:
receiving a configuration related to a channel state information (CSI) measurement; and
monitoring the downlink control channel on a specific subframe set of several subframe sets based on parameters for physical downlink shared channel (PDSCH) resource element mapping received via higher layer signaling,
wherein the parameters include one or more zero power channel state information reference signal (CSI-RS) configurations, when the received configuration indicates several subframe sets in which different CSI measurements are each to be performed for one serving cell.

### Claim 2 (depends on 1)

The method according to claim 1, wherein, when the received configuration indicates the several subframe sets, the several subframe sets are linked to different enhanced downlink control channel (EPDCCH) sets.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the specific subframe set is configured for the UE to monitor a specific EPDCCH set that is quasi co-located with an uplink-downlink (UL-DL) configuration configured for downlink communication at a time corresponding to the specific subframe set.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising:
receiving a reconfiguration message including information indicating the specific subframe set.

### Claim 5

A user equipment (UE) for monitoring a downlink control channel in a wireless communication system, the UE comprising:
a radio frequency unit; and
a processor,
wherein the processor is coupled to the radio frequency unit and configured to:
receive a configuration related to a channel state information (CSI) measurement, and
monitor the downlink control channel on a specific subframe set of the several subframe sets based on parameters for physical downlink shared channel (PDSCH) resource element mapping received via higher layer signaling, and
wherein the parameters include one or more zero power CSI-reference signal (CSI-RS) configurations, when the received configuration indicates several subframe sets in which different CSI measurements are each to be performed for one serving cell.

### Claim 6 (depends on 5)

The UE according to claim 5, wherein, when the received configuration indicates the several subframe sets, the several subframe sets are linked to different enhanced downlink control channel (EPDCCH) sets.

### Claim 7 (depends on 6)

The UE according to claim 6, wherein the specific subframe set is configured for the processor to monitor a specific EPDCCH set that is quasi co-located with an uplink-downlink (UL-DL) configuration configured for downlink communication at a time corresponding to the specific subframe set.

### Claim 8 (depends on 5)

The UE according to claim 5, wherein the processor is further configured to receive a reconfiguration message including information indicating the specific subframe set.