# US 2021/0243742 A1 · Determining an energy per resource element for a symbol including a cell-specific reference signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243742 A1 - Document ID: US20210243742A1 - Status: Published application - Kind: A1 - Application number: 17/248,359 - Filed: 2021-01-21 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ayan SENGUPTA; Alberto RICO ALVARINO; Le LIU - Web page: https://patentgrep.com/patent/US20210243742A1 ## CPC - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 27/2601: {Multicarrier modulation systems} - H04L 27/261: {Details of reference signals} - 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 Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical downlink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between a narrowband reference signal (NRS) EPRE and a CRS EPRE. The UE may demodulate the OFDM symbol based at least in part on the NPDSCH EPRE. Numerous other aspects are provided. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: determining, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical downlink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between a narrowband reference signal (NRS) EPRE and a CRS EPRE; and demodulating the OFDM symbol based at least in part on the NPDSCH EPRE. ### Claim 2 (depends on 1) The method of claim 1, wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on at least one of: a quantity of CRS ports configured by the B S, a quantity of NRS ports configured by the BS, or whether a narrowband cell is an in-band deployment and associated with a same primary cell identifier (PCI) as a full-bandwidth cell associated with a CRS transmitted in the one or more CRS resource elements. ### Claim 3 (depends on 2) The method of claim 2, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on the EPRE differential and at least one of: the quantity of CRS ports configured by the BS, the quantity of NRS ports configured by the BS, or whether the narrowband cell is an in-band deployment and is associated with the same PCI as the full-bandwidth cell associated with the CRS transmitted in the one or more CRS resource elements. ### Claim 4 (depends on 3) The method of claim 3, wherein the narrowband cell is associated with the same PCI as the full-bandwidth cell associated with the CRS transmitted in the one or more CRS resource elements. ### Claim 5 (depends on 3) The method of claim 3, wherein the quantity of CRS ports and the quantity of NRS ports are a same quantity. ### Claim 6 (depends on 5) The method of claim 5, wherein the quantity of CRS ports is two CRS ports and the quantity of NRS ports is two NRS ports; and wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining a first NPDSCH EPRE for a first CRS port of the two CRS ports; and determining a second NPDSCH EPRE for a second CRS port of the two CRS ports. ### Claim 7 (depends on 3) The method of claim 3, wherein the narrowband cell is not associated with the same PCI as the full-bandwidth cell associated with the CRS transmitted in the one or more CRS resource elements; and wherein the method further comprises: receiving an indication of the EPRE differential. ### Claim 8 (depends on 7) The method of claim 7, wherein the quantity of CRS ports is greater relative to the quantity of NRS ports; wherein two or more CRS ports configured by the BS are virtualized into one or more NRS ports configured by the BS; and wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on the two or more CRS ports configured by the BS being virtualized into the one or more NRS ports configured by the BS. ### Claim 9 (depends on 3) The method of claim 3, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on a formula, indicated in a table or a specification, for determining a ratio between the NPDSCH EPRE for the OFDM symbol and the NRS EPRE. ### Claim 10 (depends on 9) The method of claim 9, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: identifying the formula in the table or the specification based at least in part on the quantity of CRS ports configured by the BS and the quantity of NRS ports configured by the BS. ### Claim 11 (depends on 3) The method of claim 3, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on a formula, indicated in a table or a specification, for determining a ratio between the NPDSCH EPRE for the OFDM symbol and another NPDSCH EPRE for another OFDM symbol that includes only NPDSCH resource elements. ### Claim 12 (depends on 11) The method of claim 11, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: identifying the formula in the table or the specification based at least in part on the quantity of CRS ports configured by the BS and the quantity of NRS ports configured by the BS. ### Claim 13 (depends on 3) The method of claim 3, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on the OFDM symbol being modulated using 16 quadrature amplitude modulation (16QAM) or quadrature phase-shift keying (QPSK) modulation. ### Claim 14 (depends on 3) The method of claim 3, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on receiving an indication of whether to determine the NPDSCH EPRE based at least in part on the EPRE differential or to be a same NPDSCH EPRE as another OFDM symbol that includes one or more other NPDSCH resource elements and one or more NRS resource elements. ### Claim 15 (depends on 2) The method of claim 2, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on an indication of the NPDSCH EPRE for the OFDM symbol received from a base station. ### Claim 16 (depends on 15) The method of claim 15, wherein the narrowband cell is not associated with the same PCI as the full-bandwidth cell associated with the CRS transmitted in the one or more CRS resource elements. ### Claim 17 (depends on 1) The method of claim 1, wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements; and wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 18 (depends on 17) The method of claim 17, wherein a ratio between the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements and the NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements is based at least in part on a power boost value applied to the NRS and indicated in a table or a specification. ### Claim 19 (depends on 18) The method of claim 18, wherein the OFDM symbol is modulated using 16 quadrature amplitude modulation (16QAM). ### Claim 20 (depends on 19) The method of claim 19, wherein the OFDM symbol is transmitted in a non-anchor narrowband Internet of things (NB-IoT) carrier. ### Claim 21 (depends on 18) The method of claim 18, wherein a base station indicates one or more non-anchor narrowband Internet of things (NB-IoT) carriers for 16 quadrature amplitude modulation (16QAM) transmission on which the table or the specification may be used. ### Claim 22 A method of wireless communication performed by a base station (BS), comprising: determining, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical uplink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between a narrowband reference signal (NRS) EPRE and a CRS EPRE; and transmitting an indication of the NPDSCH EPRE to a user equipment (UE). ### Claim 23 (depends on 22) The method of claim 22, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on at least one of: a quantity of CRS ports configured by the B S, a quantity of NRS ports configured by the BS, or whether a narrowband cell is an in-band deployment and is associated with a same primary cell identifier (PCI) as a full-bandwidth cell associated with a CRS transmitted in the one or more CRS resource elements. ### Claim 24 (depends on 23) The method of claim 23, wherein the narrowband cell is associated with the same PCI as the full-bandwidth cell associated with the CRS transmitted in the one or more CRS resource elements. ### Claim 25 (depends on 24) The method of claim 24, wherein the quantity of CRS ports and the quantity of NRS ports are a same quantity. ### Claim 26 (depends on 25) The method of claim 25, wherein the quantity of CRS ports is two CRS ports and the quantity of NRS ports is two NRS ports; and wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining a first NPDSCH EPRE for a first CRS port of the two CRS ports; and determining a second NPDSCH EPRE for a second CRS port of the two CRS ports. ### Claim 27 (depends on 23) The method of claim 23, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on a formula, indicated in a table or a specification, for determining a ratio between the NPDSCH EPRE for the OFDM symbol and the NRS EPRE. ### Claim 28 (depends on 27) The method of claim 27, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: identifying the formula in the table or the specification based at least in part on the quantity of CRS ports configured by the BS and the quantity of NRS ports configured by the BS. ### Claim 29 (depends on 23) The method of claim 23, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on a formula, indicated in a table or a specification, for determining a ratio between the NPDSCH EPRE for the OFDM symbol and another NPDSCH EPRE for another OFDM symbol that includes only NPDSCH resource elements. ### Claim 30 (depends on 29) The method of claim 29, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: identifying the formula in the table or the specification based at least in part on the quantity of CRS ports configured by the BS and the quantity of NRS ports configured by the BS. ### Claim 31 (depends on 22) The method of claim 22, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on the OFDM symbol being modulated using 16 quadrature amplitude modulation (16QAM) or quadrature phase-shift keying (QPSK) modulation. ### Claim 32 (depends on 22) The method of claim 22, wherein determining the NPDSCH EPRE for the OFDM symbol comprises: determining the NPDSCH EPRE for the OFDM symbol based at least in part on the OFDM symbol being modulated using 16 quadrature amplitude modulation (16QAM); and wherein the method further comprises: determining a second NPDSCH EPRE for a second OFDM symbol that includes one or more second CRS resource elements and one or more second NPDSCH resource elements to be a same NPDSCH EPRE as a third OFDM symbol that includes one or more third NPDSCH resource elements and one or more NRS resource elements. ### Claim 33 A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical downlink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between a narrowband reference signal (NRS) EPRE and a CRS EPRE; and demodulate the OFDM symbol based at least in part on the NPDSCH EPRE. ### Claim 34 (depends on 33) The UE of claim 33, wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements, and wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 35 A base station (BS) for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical uplink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between a narrowband reference signal (NRS) EPRE and a CRS EPRE; and transmit an indication of the NPDSCH EPRE to a user equipment (UE). ### Claim 36 (depends on 35) The BS of claim 35, wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements, and wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 37 A method of wireless communication performed by a user equipment (UE), comprising: determining, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical downlink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and narrowband reference signal (NRS) resource elements; and demodulating the OFDM symbol based at least in part on the NPDSCH EPRE ### Claim 38 (depends on 37) The method of claim 37, wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 39 (depends on 37) The method of claim 37, wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between an NRS EPRE and a CRS EPRE. ### Claim 40 A method of wireless communication performed by a base station (BS), comprising: determining, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical uplink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and narrowband reference signal (NRS) resource elements; and transmitting an indication of the NPDSCH EPRE to a user equipment (UE). ### Claim 41 (depends on 40) The method of claim 40, wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 42 (depends on 40) The method of claim 40, wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between an NRS EPRE and a CRS EPRE. ### Claim 43 A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical downlink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and narrowband reference signal (NRS) resource elements; and demodulate the OFDM symbol based at least in part on the NPDSCH EPRE. ### Claim 44 The UE of 43, wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 45 (depends on 43) The UE of claim 43, wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between an NRS EPRE and a CRS EPRE. ### Claim 46 A base station (BS) for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine, for an orthogonal frequency division (OFDM) symbol that includes one or more cell-specific reference signal (CRS) resource elements and one or more narrowband physical uplink shared channel (NPDSCH) resource elements, an NPDSCH energy per resource element (EPRE), wherein the NPDSCH EPRE is different from an NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and narrowband reference signal (NRS) resource elements; and transmit an indication of the NPDSCH EPRE to a user equipment (UE). ### Claim 47 (depends on 46) The BS of claim 46, wherein the NPDSCH EPRE for OFDM symbols that include NPDSCH resource elements and NRS resource elements is different from an NPDSCH EPRE for OFDM symbols that include only NPDSCH resource elements. ### Claim 48 (depends on 46) The BS of claim 46, wherein the NPDSCH EPRE for the OFDM symbol is based at least in part on an EPRE differential between an NRS EPRE and a CRS EPRE.