# US 10,122,501 B2 · Method for receiving ACK/NACK signal and MTC device

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- Number: US 10,122,501 B2
- Document ID: US10122501B2
- Status: Granted
- Kind: B2
- Application number: 15/524,100
- Filed: 2015-11-03
- Published: 2017-11-23
- Granted: 2018-11-06
- Earliest claimed: 2014-11-05
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyangsun You; Yunjung Yi; Suckchel Yang
- Web page: https://patentgrep.com/patent/US10122501B2

## CPC

- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 1/1614: {using bitmaps}
- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04L 12/1868: {Measures taken after transmission, e.g. acknowledgments}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure provides a method for a machine type communication (MTC) device to receive a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/non-acknowledgement (NACK) signal. The method can include the steps of: the MTC device transmitting a physical uplink control channel (PUCCH) including uplink data; the MTC device determining a radio network temporary identifier (RNTI) for itself from among a plurality of new RNTIs; monitoring the reception of a downlink control channel in a search space; and receiving a HARQ ACK/NACK signal for the transmission of the uplink data by decoding a downlink control channel scrambled with the determined RNTI.

## Claims

### Claim 1

A method for receiving a hybrid automatic repeat request (HARQ) acknowledgment (ACK)/non-acknowledgment (NACK) signal, the method performed by a machine type communication (MTC) device and comprising:
transmitting, by the MTC device, a physical uplink control channel (PUSCH) including uplink data;
determining, by the MTC device, a radio network temporary identifier (RNTI) for the MTC device itself among a plurality of new RNTIs;
monitoring reception of a downlink control channel in a search space; and
receiving an HARQ ACK/NACK signal for transmission of the uplink data by decoding a downlink control channel scrambled with the determined RNTI.

### Claim 2 (depends on 1)

The method of claim 1, wherein the downlink control channel is repeatedly received on a plurality of subframes based on a predetermined repetition level.

### Claim 3 (depends on 1)

The method of claim 1, wherein an area where the MTC device monitors the downlink control channel in the search space is determined according to the repetition level.

### Claim 4 (depends on 1)

The method of claim 1, wherein the MTC device determines its RNTI among the plurality of new RNTIs based on an upper layer signal received from the base station.

### Claim 5 (depends on 1)

The method of claim 1, wherein the MTC device determines its RNTI among the plurality of new RNTIs based on its user equipment (UE) ID or C-RNTI.

### Claim 6 (depends on 1)

The method of claim 1, wherein the MTC device determines its RNTI among the plurality of new RNTIs based on a location where the downlink control channel is received in the search space.

### Claim 7 (depends on 1)

The method of claim 1, wherein the MTC device determines its RNTI among the plurality of new RNTIs based on a location of a resource that has received a downlink control channel including scheduling information for the PUSCH.

### Claim 8 (depends on 1)

The method of claim 1, wherein the MTC device determines its RNTI among the plurality of new RNTIs based on a location of a resource to which the PUSCH was transmitted.

### Claim 9 (depends on 1)

The method of claim 1, wherein the MTC device determines its RNTI among the plurality of new RNTIs based on its own coverage extension level, a repetition level of the downlink control channel, or a repetition level of the PUSCH.

### Claim 10

A machine type communication (MTC) device for receiving a hybrid automatic repeat request (HARQ) acknowledgment (ACK)/non-acknowledgment (NACK), the MTC device comprising:
a radio frequency (RF) unit for transmitting a physical uplink control channel (PUSCH) including uplink data; and
a processor,
wherein the processor performs:
determining a radio network temporary identifier (RNTI) for the MTC device itself among a plurality of new RNTIs;
monitoring reception of a downlink control channel in a search space through the RF unit; and
receiving a HARQ ACK/NACK signal for transmission of the uplink data by decoding a downlink control channel scrambled with the determined RNTI.

### Claim 11 (depends on 10)

The MTC device of claim 10, wherein the downlink control channel is repeatedly received on a plurality of subframes based on a predetermined repetition level.

### Claim 12 (depends on 10)

The MTC device of claim 10, wherein an area in which the MTC device monitors the downlink control channel in the search space is determined according to the repetition level.