# US 10,321,447 B2 · Determining a DRX configuration parameter based in part on an M-PDCCH parameter

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- Number: US 10,321,447 B2
- Document ID: US10321447B2
- Status: Granted
- Kind: B2
- Application number: 15/236,947
- Filed: 2016-08-15
- Published: 2017-04-27
- Granted: 2019-06-11
- Earliest claimed: 2015-10-26
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Alberto Rico Alvarino; Madhavan Srinivasan Vajapeyam; Wanshi Chen; Hao Xu
- Web page: https://patentgrep.com/patent/US10321447B2

## CPC

- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 52/0225: {using monitoring of external events, e.g. the presence of a signal}
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/189: {Transmission or retransmission of more than one copy of a message}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0057: {Physical resource allocation for CQI}
- Y02D 30/70: in wireless communication networks
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

In eMTC, channels may be bundled, using repetitions in multiple subframes. SPS and DRX for eMTC may not accommodate such repetitions, because repetitions for a bundled channel may fall only partially within a DRX ON duration. An apparatus addresses this problem by determining a DRX ON duration, determining a set of subframes carrying a bundled M-PDCCH candidate and determining that the DRX ON duration at least partially overlaps with the set of subframes of the bundled M-PDCCH. The apparatus then refrains from decoding the first bundled M-PDCCH candidate, decodes the first bundled M-PDCCH candidate, or extends the DRX ON duration to include the set of subframes entirely and decoding the first bundled M-PDCCH candidate carried in the set of subframes in the extended DRX ON duration. The apparatus may also determine DRX configuration parameters based on parameters of bundled channels, and handle invalid subframes for an SPS grant.

## Claims

### Claim 1

A method of wireless communication at a user equipment (UE), comprising:
determining a parameter of a machine-type-communication (MTC) physical downlink control channel (M-PDCCH) candidate monitored by the UE, wherein the parameter relates to a repetition of the M-PDCCH candidate;
receiving an indication associated with a discontinuous reception (DRX) configuration of the UE;
determining, at the UE, a DRX configuration parameter, the DRX configuration parameter being a function of the parameter of the M-PDCCH candidate and the indication; and
performing DRX based on the DRX configuration parameter determined by the UE.

### Claim 2 (depends on 1)

The method of claim 1, wherein the parameter of the M-PDCCH comprises a repetition level of the M-PDCCH.

### Claim 3 (depends on 1)

The method of claim 1, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH.

### Claim 4 (depends on 1)

The method of claim 1, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH, the method further comprising:
determining a repetition level for each of a plurality of M-PDCCH candidates monitored by the UE; and
determining, at the UE, a DRX ON duration as a function of the indication and a maximum repetition level for the plurality of M-PDCCH candidates.

### Claim 5

An apparatus for wireless communication at a user equipment (UE), comprising:
means for determining a parameter of a machine-type-communication (MTC) physical downlink control channel (M-PDCCH) candidate monitored by the UE, wherein the parameter relates to a repetition of the M-PDCCH candidate;
means for receiving an indication associated with a discontinuous reception (DRX) configuration of the UE;
means for determining, at the UE, a DRX configuration parameter, the DRX configuration parameter being a function of the parameter of the M-PDCCH candidate and the indication; and
means for performing DRX based on the DRX configuration parameter determined by the UE.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the parameter of the M-PDCCH comprises a repetition level of the M-PDCCH.

### Claim 7 (depends on 5)

The apparatus of claim 5, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH.

### Claim 8 (depends on 5)

The apparatus of claim 5, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH, wherein the means for determining the parameter determines a repetition level for each of a plurality of M-PDCCH candidates monitored by the UE, and wherein the means for determining the DRX configuration parameter determines a DRX ON duration as a function of the indication and a maximum repetition level for the plurality of M-PDCCH candidates.

### Claim 9

An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine a parameter of a machine-type-communication (MTC) physical downlink control channel (M-PDCCH) candidate monitored by the UE, wherein the parameter relates to a repetition of the M-PDCCH candidate;
receive an indication associated with a discontinuous reception (DRX) configuration of the UE;
determine, at the UE, a DRX configuration parameter, the DRX configuration parameter being a function of the parameter of the M-PDCCH candidate and the indication; and
perform DRX based on the DRX configuration parameter determined by the UE.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein the parameter of the M-PDCCH comprises a repetition level of the M-PDCCH.

### Claim 11 (depends on 9)

The apparatus of claim 9, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH.

### Claim 12 (depends on 9)

The apparatus of claim 9, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH, wherein the at least one processor determines the parameter by determining a repetition level for each of a plurality of M-PDCCH candidates monitored by the UE, and wherein the at least one processor determines a DRX ON duration as a function of the indication and a maximum repetition level for the plurality of M-PDCCH candidates.

### Claim 13

A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE), comprising code to:
determine a parameter of a machine-type-communication (MTC) physical downlink control channel (M-PDCCH) candidate monitored by the UE, wherein the parameter relates to a repetition of the M-PDCCH candidate;
receive an indication associated with a discontinuous reception (DRX) configuration of the UE;
determine, at the UE, a DRX configuration parameter, the DRX configuration parameter being a function of the parameter of the M-PDCCH candidate and the indication; and
performing DRX based on the DRX configuration parameter determined by the UE.

### Claim 14 (depends on 13)

The non-transitory computer-readable medium of claim 13, wherein the parameter of the M-PDCCH comprises a repetition level of the M-PDCCH.

### Claim 15 (depends on 13)

The non-transitory computer-readable medium of claim 13, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH.

### Claim 16 (depends on 13)

The non-transitory computer-readable medium of claim 13, wherein the indication comprises a number of subframes for which the UE should monitor PDCCH, and further comprising code to determine the parameter by determining a repetition level for each of a plurality of M-PDCCH candidates monitored by the UE, and code to determine a DRX ON duration as a function of the indication and a maximum repetition level for the plurality of M-PDCCH candidates.