# US 2017/0289818 A1 · Methods and apparatus for partial subframe transmission and broadcast channel on unlicensed spectrum > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0289818 A1 - Document ID: US20170289818A1 - Status: Published application - Kind: A1 - Application number: 15/146,859 - Filed: 2016-05-04 - Published: 2017-10-05 - Earliest claimed: 2015-05-08 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd - Inventors: Boon Loong Ng; Thomas David Novlan - Web page: https://patentgrep.com/patent/US20170289818A1 ## CPC - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0082: {at predetermined intervals} - H04L 5/0092: {Indication of how the channel is divided} - H04L 27/2662: {Symbol synchronisation} - H04W 48/12: using downlink control channel - 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 - H04L 5/0023: {Time-frequency-space} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - 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 An apparatus for user equipment (UE). The UE comprises a transceiver configured to receive an indication of a partial subframe configuration over an unlicensed spectrum in a licensed assisted access (LAA) cell. The UE further includes at least one processor configured to determine a resource element (RE) mapping rule based on the indication of the partial subframe configuration; and identify an RE position of at least one reference signal to be received from the eNB based on the RE mapping rule. ## Claims ### Claim 1 A user equipment (UE), the UE comprising: a transceiver configured to receive, from an eNodeB (eNB), an indication of a partial subframe configuration over an unlicensed spectrum in a licensed assisted access (LAA) cell; and at least one processor configured to: determine a resource element (RE) mapping rule based on the indication of the partial subframe configuration; and identify an RE position of at least one reference signal to be received from the eNB based on the RE mapping rule. ### Claim 2 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to identify a valid starting position of at least one orthogonal frequency division multiplexing (OFDM) symbol of a downlink transmission burst based on the indication of the partial subframe configuration. ### Claim 3 (depends on 2) The UE of claim 2, wherein the downlink transmission burst including the valid starting position of the at least one OFDM symbol that is configured by the indication of the partial subframe configuration comprises at least one of a physical downlink shared channel (PDSCH), an enhanced physical downlink control channel (EPDCCH), and a physical downlink control channel (PDCCH). ### Claim 4 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to determine a set of valid starting and ending positions of at least one OFDM symbol of a downlink transmission burst based on the indication of the partial subframe configuration. ### Claim 5 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to determine the RE position of the at least one reference signal based on a valid starting position of at least one OFDM symbol of a downlink transmission burst. ### Claim 6 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to: apply the RE mapping rule when the indication of the partial subframe configuration is received from the eNB; and apply a different RE rule when the indication of the partial subframe configuration is not received from the eNB. ### Claim 7 (depends on 6) The UE of claim 6, when the indication of the partial subframe configuration is received from the eNB, the RE rule comprises identifying the RE position of at least one reference signal based on a non-multicast broadcast single frequency network (non-MBSFN) subframe pattern for the partial subframe regardless of whether MBSFN subframe is configured for the partial subframe. ### Claim 8 (depends on 1) The UE of claim 1, wherein the at least one reference signal comprises a common reference signal (CRS) that is configured by the indication of the partial subframe configuration, the configured CRS mapping in a non-MBSFN subframe. ### Claim 9 An eNodeB (eNB), the eNB comprising: a transceiver configured to transmit, to a user equipment (UE), an indication of a partial subframe configuration over an unlicensed spectrum in a licensed assisted access (LAA) cell; and at least one processor configured to when a resource element (RE) mapping rule is used based on the indication of the partial subframe configuration, configure an RE position of at least one reference signal to be transmitted to the UE based on the RE mapping rule. ### Claim 10 (depends on 9) The eNB of claim 9, wherein the at least one processor is further configured to identify a valid starting position of at least one orthogonal frequency division multiplexing (OFDM) symbol of a downlink transmission burst based on the indication of the partial subframe configuration. ### Claim 11 (depends on 10) The eNB of claim 10, wherein the downlink transmission burst including the valid starting position of the at least one OFDM symbol that is configured by the indication of the partial subframe configuration comprises at least one of a physical downlink shared channel (PDSCH), an enhanced physical downlink control channel (EPDCCH), and a physical downlink control channel (PDCCH). ### Claim 12 (depends on 9) The eNB of claim 9, wherein the at least one processor is further configured to determine a set of valid starting and ending positions of at least one OFDM symbol of a downlink transmission burst based on the indication of the partial subframe configuration. ### Claim 13 (depends on 9) The eNB of claim 9, wherein the at least one processor is further configured to determine the RE position of the at least one reference signal based on a valid starting position of at least one OFDM symbol of a downlink transmission burst. ### Claim 14 (depends on 9) The eNB of claim 9, wherein the at least one processor is further configured to: apply the RE mapping rule when the indication of the partial subframe configuration is transmitted to the UE; and apply a different RE mapping rule when the indication of the partial subframe configuration is not transmitted to the UE. ### Claim 15 (depends on 14) The eNB of claim 14, when the indication of the partial subframe configuration is transmitted to the UE, the first rule comprises at least one RE positions indicated based on a non-multicast broadcast single frequency network (non-MBSFN) subframe pattern for the partial subframe regardless of whether MBSFN subframe is configured for the partial subframe. ### Claim 16 (depends on 9) The eNB of claim 9, wherein the at least one reference signal comprises a common reference signal (CRS) that is configured by the indication of the partial subframe configuration, the configured CRS mapping in a non-MBSFN subframe. ### Claim 17 A user equipment (UE), the UE comprising: a transceiver configured to receive, from an eNodeB (eNB), an indication of a bandwidth configuration of a licensed assisted access (LAA) cell over an unlicensed spectrum; and at least one processor configured to determine a frequency location of an unlicensed physical broadcasting channel (U-PBCH) to be received from the eNB based on the indication of the bandwidth configuration. ### Claim 18 (depends on 17) The UE of claim 17, wherein the at least one processor is further configured to determine the frequency location of the U-PBCH using a blind detection of the U-PBCH. ### Claim 19 (depends on 17) The UE of claim 17, wherein the at least one processor is further configured to determine the frequency location of the U-PBCH using a blind detection of at least one reference signal to be received from the eNB. ### Claim 20 (depends on 17) The UE of claim 17, wherein the at least one processor is further configured to determine the frequency location of the U-PBCH based on at least one reference signal including bandwidth configuration information of the LAA cell.