# US 10,484,852 B2 · Method and NB-IoT device for receiving downlink physical channel on TDD special subframe > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,852 B2 - Document ID: US10484852B2 - Status: Granted - Kind: B2 - Application number: 16/383,103 - Filed: 2019-04-12 - Published: 2019-08-01 - Granted: 2019-11-19 - Earliest claimed: 2017-07-12 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seunggye Hwang; Changhwan Park; Seokmin Shin; Joonkui Ahn; Suckchel Yang - Web page: https://patentgrep.com/patent/US10484852B2 ## CPC - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04L 5/00: Arrangements affording multiple use of the transmission path - 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 5/0078: {Timing of allocation} - H04L 5/1469: {using time-sharing} - H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence) - H04W 72/04: Wireless resource allocation - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/12: Wireless traffic scheduling - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - 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 One disclosure of the present specification provides a method for receiving a downlink physical channel by a narrowband Internet of things (NB-IoT) device. The method may comprise the steps of: determining whether to receive a signal of a downlink physical channel from an NB-IoT cell, on a downlink pilot time slot (DwPTS) of a time division duplex (TDD) special subframe; and receiving the signal of the downlink physical channel on the TDD special subframe including the DwPTS, on the basis of the determination. ## Claims ### Claim 1 A method for receiving a downlink physical channel by a Narrowband Internet of Things (NB-IoT) device, the method comprising: determining whether to receive a signal of a downlink physical channel from an NB-IoT cell on a Downlink Pilot Time Slot (DwPTS) of a Time Division Duplex (TDD) special subframe; and based on the determination, receiving a signal of a downlink physical channel on the TDD special subframe including the DwPTS, wherein the determining is performed based on one or more of a size of the DwPTS and an operation mode of the NB-IoT cell, wherein the operation mode includes one or more of stand-alone, in-band, and guard-band modes, and wherein based on (i) a signal of the downlink physical channel is received repeatedly on a plurality of subframes including the TDD special subframe, and (ii) one or more REs within the TDD special subframe are available for a Narrowband reference signal (NRS): the signal of the downlink physical channel is punctured on the corresponding RE. ### Claim 2 (depends on 1) The method of claim 1, wherein the downlink physical channel includes one or more of Narrowband Physical Downlink Shared Channel (NPDSCH) and Narrowband Physical Downlink Control Channel (NPDCCH). ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving a signal of the downlink physical channel repeatedly on a plurality of subframes including the TDD special subframe and TDD downlink subframe. ### Claim 4 (depends on 3) The method of claim 3, wherein based on that a signal of the downlink physical channel is received repeatedly on the plurality of subframes, the signal of the downlink physical channel is mapped to resource elements (REs) within the TDD special subframe including the DwPTS, with reference to the TDD downlink subframe. ### Claim 5 (depends on 1) The method of claim 1, wherein a Narrowband reference signal (NRS) is mapped on third and fourth OFDM symbols within a first slot of the special subframe. ### Claim 6 A Narrowband internet of Things (NB-IoT) device configured to receive a downlink physical channel, the NB-IoT device comprising: a transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising: determining whether to receive a signal of a downlink physical channel from an NB-IoT cell on a Downlink Pilot Time Slot (DwPTS) of a Time Division Duplex (TDD) special subframe; and receiving a signal of a downlink physical channel on the TDD special subframe including the DwPTS, based on the determination, wherein the determination by the processor is performed, based on one or more of a size of the DwPTS and an operation mode of the NB-IoT cell, wherein the operation mode includes one or more of stand-alone, in-band, and guard-band modes, and wherein based on (i) a signal of the downlink physical channel is received repeatedly on a plurality of subframes including the TDD special subframe, and (ii) one or more REs within the TDD special subframe are available for a Narrowband reference signal (NRS): the signal of the downlink physical channel is punctured on the corresponding RE. ### Claim 7 (depends on 6) The NB-IoT device of claim 6, wherein the downlink physical channel includes one or more of Narrowband Physical Downlink Shared Channel (NPDSCH) and Narrowband Physical Downlink Control Channel (NPDCCH). ### Claim 8 (depends on 6) The NB-IoT device of claim 6, wherein the processor is configured to receive a signal of the downlink physical channel repeatedly on a plurality of subframes including the TDD special subframe and TDD downlink subframe. ### Claim 9 (depends on 8) The NB-IoT device of claim 8, wherein based on that a signal of the downlink physical channel is received repeatedly on the plurality of subframes, the signal of the downlink physical channel is mapped to resource elements (REs) within the TDD special subframe including the DwPTS with reference to the TDD downlink subframe. ### Claim 10 (depends on 6) The NB-IoT device of claim 6, wherein a Narrowband reference signal (NRS) is mapped on third and fourth OFDM symbols within a first slot of the special subframe.