# US 10,455,565 B2 · Method and MTC device for receiving downlink control channel

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- Number: US 10,455,565 B2
- Document ID: US10455565B2
- Status: Granted
- Kind: B2
- Application number: 15/509,162
- Filed: 2015-09-24
- Published: 2017-09-21
- Granted: 2019-10-22
- Earliest claimed: 2014-09-24
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyangsun You; Yunjung Yi; Kijun Kim; Suckchel Yang; Hanbyul Seo
- Web page: https://patentgrep.com/patent/US10455565B2

## CPC

- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 25/03: Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04W 72/12: Wireless traffic scheduling
- H04L 5/0023: {Time-frequency-space}
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- 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

Provided is a method for receiving a downlink control channel in a machine type communication (MTC) device configured to operate only in a part of a band among system bands of a cell. A method for receiving a downlink control channel can comprise the steps of: determining a precoding matrix index (PMI) applied to a downlink control channel receivable only in a part of a band; receiving from a cell the downlink control channel in the part of the band in a data area of a subframe; and decoding the downlink control channel, which has been received from the cell, on the basis of the determined PMI.

## Claims

### Claim 1

A method for receiving a downlink control channel, the method performed by a wireless device and comprising:
monitoring the downlink control channel,
wherein the downlink control channel is repeated on a plurality of subframes for a coverage enhancement,
wherein one or more resource elements (REs), on which cell-specific reference signals (CRSs) are transmitted, are not used for a transmission of the downlink control channel,
wherein one or more resource elements (REs), on which synchronization signals are transmitted, are not used for the transmission of the downlink control channel,
wherein the downlink control channel is monitored in a common search space (CSS) within a narrowband,
wherein the narrowband for receiving the downlink control channel includes six maximum physical resource blocks (PRBs),
wherein the downlink control channel is transmitted based on a localized transmission mode or a distributed transmission mode,
wherein, within the localized transmission mode, the one or more enhanced resource element groups (EREGs) are transmitted in one physical resource block (PRB) pair to form an enhanced control channel element (ECCE) for the downlink control channel,
wherein, within the distributed transmission mode, the one or more enhanced resource element groups (EREGs) are transmitted in a plurality of PRB pairs to form the ECCE for the downlink control channel,
wherein the downlink control channel is an MTC physical downlink control channel (MPDCCH), and
wherein the distributed transmission mode is used for the CSS.

### Claim 2 (depends on 1)

The method of claim 1, wherein the downlink control channel includes a scheduling of a physical downlink shared channel (PDSCH),
wherein the scheduling of the PDSCH corresponds to a cross subframe scheduling such that a subframe on which the PDSCH is received is later than the plurality of subframes on which the downlink control channel is received.

### Claim 3

A wireless device for receiving a downlink control channel, comprising:
a transceiver;
a processor configured to control the transceiver and configured to: monitor the downlink control channel,
wherein the downlink control channel is repeated on a plurality of subframes for a coverage enhancement,
wherein one or more resource elements (REs), on which cell-specific reference signals (CRSs) are transmitted, are not used for a transmission of the downlink control channel,
wherein one or more resource elements (REs), on which synchronization signals are transmitted, are not used for the transmission of the downlink control channel,
wherein the downlink control channel is monitored in a common search space (CSS) within a narrowband,
wherein the narrowband for receiving the downlink control channel includes six maximum physical resource blocks (PRBs),
wherein the downlink control channel is transmitted based on a localized transmission mode or a distributed transmission mode,
wherein, within the localized transmission mode, the one or more enhanced resource element groups (EREGs) are transmitted in one physical resource block (PRB) pair to form an enhanced control channel element (ECCE) for the downlink control channel,
wherein, within the distributed transmission mode, the one or more enhanced resource element groups (EREGs) are transmitted in a plurality of PRB pairs to form the ECCE for the downlink control channel,
wherein the downlink control channel is an MTC physical downlink control channel (MPDCCH), and
wherein the distributed transmission mode is used for the CSS.

### Claim 4 (depends on 3)

The wireless device of claim 3, wherein the downlink control channel includes a scheduling of a physical downlink shared channel (PDSCH),
wherein the scheduling of the PDSCH corresponds to a cross subframe scheduling such that a subframe on which the PDSCH is received is later than the plurality of subframes on which the downlink control channel is received.