# US 2020/0288491 A1 · Multiplexing method for narrowband internet of things physical downlink channels, base station, and user equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288491 A1 - Document ID: US20200288491A1 - Status: Published application - Kind: A1 - Application number: 16/066,122 - Filed: 2016-12-26 - Published: 2020-09-10 - Earliest claimed: 2015-12-28 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: RENMAO LIU; MENG ZHANG - Web page: https://patentgrep.com/patent/US20200288491A1 ## CPC - H04W 72/04: Wireless resource allocation - H04W 72/1273: of downlink data flows - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2602: {Signal structure} - H04W 72/0446: Resources in time domain, e.g. slots or frames - 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 Embodiments of the present disclosure provide a multiplex transmission method for narrowband Internet of Things physical downlink channels, and a corresponding base station and user equipment for executing the method. The base station according to the embodiments of the present disclosure comprises a mapping unit, configured to multiplex more than one narrowband Internet of Things physical downlink channel in the same subframe, wherein the narrowband Internet of Things physical downlink channels comprise narrowband Internet of Things physical downlink control channels (NB-PDCCHs) and/or narrowband Internet of Things physical downlink shared channels (NB-PDSCHs), a minimum granularity for resource allocation of the narrowband Internet of Things physical downlink channels is in a unit of an enhanced resource element group (EREG), and the EREG is composed of multiple resource elements defined in two dimensions of time and frequency in the same subframe; and a transmitting unit, configured to transmit a downlink subframe. ## Claims ### Claim 1 A base station, comprising: a mapping unit, configured to multiplex more than one narrowband Internet of Things physical downlink channel in the same subframe, wherein the narrowband Internet of Things physical downlink channels comprise narrowband Internet of Things physical downlink control channels “NB-PDCCHs” and/or narrowband Internet of Things physical downlink shared channels “NB-PDSCHs”, a minimum granularity for resource allocation of the narrowband Internet of Things physical downlink channels is in a unit of an enhanced resource element group “EREG”, and the EREG is composed of multiple resource elements defined in two dimensions of time and frequency in the same subframe; and a transmitting unit, configured to transmit a downlink subframe. ### Claim 2 (depends on 1) The base station according to claim 1, wherein one NB-PDCCH is composed of one or more enhanced control channel elements “ECCEs”, and each ECCE is mapped to one or more EREGs; and/or one NB-PDSCH is composed of one or more enhanced shared channel elements “ESCEs”, and each ESCE is mapped to one or more EREGs. ### Claim 3 (canceled) ### Claim 4 (depends on 1) The base station according to claim 1, wherein both an NB-PDSCH and an NB-PDCCH are multiplexed in the same subframe; or more than one NB-PDSCH is multiplexed and no NB-PDCCH is multiplexed in the same subframe. ### Claim 5 (canceled) ### Claim 6 (depends on 1) The base station according to claim 1, wherein a demodulation reference signal antenna port for demodulating narrowband Internet of Things physical downlink channel is indicated by an index number of a first ECCE in all ECCEs occupied by a to-be-demodulated NB-PDCCH, or by an index number of a first ESCE in all ESCEs occupied by a to-be-demodulated NB-PDSCH; or by a C-RNTI of a user equipment corresponding to the to-be-demodulated NB-PDCCH or NB-PDSCH. ### Claim 7 (canceled) ### Claim 8 (canceled) ### Claim 9 A method executed in a base station, the method comprising: multiplexing more than one narrowband Internet of Things physical downlink channel in the same subframe, wherein the narrowband Internet of Things physical downlink channels comprise narrowband Internet of Things physical downlink control channels “NB-PDCCHs” and/or narrowband Internet of Things physical downlink shared channels “NB-PDSCHs”, a minimum granularity for resource allocation of the narrowband Internet of Things physical downlink channels is in a unit of an enhanced resource element group “EREG”, and the EREG is composed of multiple resource elements defined in two dimensions of time and frequency in the same subframe; and transmitting a downlink subframe. ### Claim 10 (depends on 9) The method according to claim 9, wherein one NB-PDCCH is composed of one or more enhanced control channel elements “ECCEs”, and each ECCE is mapped to one or more EREGs; and/or one NB-PDSCH is composed of one or more enhanced shared channel elements “ESCEs”, and each ESCE is mapped to one or more EREGs. ### Claim 11 (canceled) ### Claim 12 (depends on 9) The method according to claim 9, wherein both an NB-PDSCH and an NB-PDCCH are multiplexed in the same subframe; or more than one NB-PDSCH is multiplexed and no NB-PDCCH is multiplexed in the same subframe. ### Claim 13 (canceled) ### Claim 14 (depends on 9) The method according to claim 9, wherein a demodulation reference signal antenna port for demodulating narrowband Internet of Things physical downlink channel is indicated by an index number of a first ECCE in all ECCEs occupied by a to-be-demodulated NB-PDCCH, or by an index number of a first ESCE in all ESCEs occupied by a to-be-demodulated NB-PDSCH; or by a C-RNTI of a user equipment corresponding to the to-be-demodulated NB-PDCCH or NB-PDSCH. ### Claim 15 (canceled) ### Claim 16 (canceled) ### Claim 17 A user equipment, comprising: a receiving unit, configured to receive a downlink subframe, wherein more than one narrowband Internet of Things physical downlink channel is multiplexed in the subframe, the narrowband Internet of Things physical downlink channels comprise narrowband Internet of Things physical downlink control channels “NB-PDCCHs” and/or narrowband Internet of Things physical downlink shared channels “NB-PDSCHs”, a minimum granularity for resource allocation of the narrowband Internet of Things physical downlink channels is in a unit of an enhanced resource element group “EREG”, and the EREG is composed of multiple resource elements defined in two dimensions of time and frequency in the same subframe; and a demapping unit, configured to extract, from the received downlink subframe, a narrowband Internet of Things physical downlink channel for the user equipment. ### Claim 18 (depends on 17) The user equipment according to claim 17, wherein one NB-PDCCH is composed of one or more enhanced control channel elements “ECCEs”, and each ECCE is mapped to one or more EREGs; and/or one NB-PDSCH is composed of one or more enhanced shared channel elements “ESCEs”, and each ESCE is mapped to one or more EREGs. ### Claim 19 (canceled) ### Claim 20 (depends on 17) The user equipment according to claim 17, wherein both an NB-PDSCH and an NB-PDCCH are multiplexed in the subframe; or more than one NB-PDSCH is multiplexed and no NB-PDCCH is multiplexed in the subframe. ### Claim 21 (canceled) ### Claim 22 (depends on 17) The user equipment according to claim 17, wherein the demapping unit is further configured to acquire a demodulation reference signal antenna port for narrowband Internet of Things physical downlink channel demodulation through an index number of a first ECCE in all ECCEs occupied by a to-be-demodulated NB-PDCCH or through a index number of a first ESCE in all ESCEs occupied by a to-be-demodulated NB-PDSCH; or through a C-RNTI of a user equipment corresponding to the to-be-demodulated NB-PDCCH or NB-PDSCH. ### Claim 23 (canceled) ### Claim 24 (canceled) ### Claim 25 A method executed in a user equipment, the method comprising: receiving a downlink subframe, wherein more than one narrowband Internet of Things physical downlink channel is multiplexed in the subframe, the narrowband Internet of Things physical downlink channels comprise narrowband Internet of Things physical downlink control channels “NB-PDCCHs” and/or narrowband Internet of Things physical downlink shared channels “NB-PDSCHs”, a minimum granularity for resource allocation of the narrowband Internet of Things physical downlink channels is in a unit of an enhanced resource element group “EREG”, and the EREG is composed of multiple resource elements defined in two dimensions of time and frequency in the same subframe; and extracting, from the received downlink subframe, a narrowband Internet of Things physical downlink channel for the user equipment. ### Claim 26 (depends on 25) The method according to claim 25, wherein one NB-PDCCH is composed of one or more enhanced control channel elements “ECCEs”, and each ECCE is mapped to one or more EREGs; and/or one NB-PDSCH is composed of one or more enhanced shared channel elements “ESCEs”, and each ESCE is mapped to one or more EREGs. ### Claim 27 (canceled) ### Claim 28 (depends on 25) The method according to claim 25, wherein both an NB-PDSCH and an NB-PDCCH are multiplexed in the subframe; or more than one NB-PDSCH is multiplexed and no NB-PDCCH is multiplexed in the subframe. ### Claim 29 (canceled) ### Claim 30 (depends on 25) The method according to claim 25, wherein a demodulation reference signal antenna port for narrowband Internet of Things physical downlink channel demodulation is acquired through an index number of a first ECCE in all ECCEs occupied by a to-be-demodulated NB-PDCCH or through an index number of a first ESCE in all ESCEs occupied by a to-be-demodulated NB-PDSCH; or through a C-RNTI of a user equipment corresponding to the to-be-demodulated NB-PDCCH or NB-PDSCH. ### Claim 31 (canceled) ### Claim 32 (canceled)