# US 10,873,938 B2 · Rate matching for broadcast channels > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,938 B2 - Document ID: US10873938B2 - Status: Granted - Kind: B2 - Application number: 16/128,405 - Filed: 2018-09-11 - Published: 2019-04-11 - Granted: 2020-12-22 - Earliest claimed: 2017-10-09 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jing Sun; Wanshi Chen; Tao Luo; Juan Montojo; Peter Gaal; Heechoon Lee; Alexandros Manolakos - Web page: https://patentgrep.com/patent/US10873938B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - 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 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 27/2649: {Demodulators} - 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 Methods, systems, and devices for wireless communications are described. A method may include receiving, from a base station and while being outside of a radio resource control (RRC) connected state, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information, and decoding the PDSCH based on the indication. Another method may include receiving, from a base station, a PDSCH that carries broadcast information over a plurality of downlink symbols and while being outside of an RRC connected state, perform a first blind decoding of the PDSCH over a first set of the plurality of downlink symbols, and perform a second blind decoding of the PDSCH during a second set of the plurality of downlink symbols, the second set being different in length than the first set. ## Claims ### Claim 1 A method for wireless communication, comprising: receiving, from a base station and while being outside of a radio resource control (RRC) connected state, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information, the length being from a starting downlink symbol index to an ending downlink symbol index, wherein the indication of the length of downlink symbols used to transmit the PDSCH is received before a radio resource control (RRC) configuration procedure between the UE and the base station; and decoding the PDSCH based at least in part on the indication. ### Claim 2 (depends on 1) The method of claim 1, wherein the broadcast information comprises remaining minimum system information (RMSI) or other system information (OSI), or both. ### Claim 3 (depends on 1) The method of claim 1, wherein the length is a fixed length of downlink symbols. ### Claim 4 (depends on 1) The method of claim 1, further comprising: receiving a downlink control information (DCI) from the base station, wherein the indication of the length of downlink symbols used to transmit the PDSCH by the base station is received in the DCI. ### Claim 5 (depends on 4) The method of claim 4, further comprising: identifying the length of downlink symbols used to transmit the PDSCH based at least in part on a bit value in a DCI field received in the DCI, wherein a demodulation reference signal (DMRS) pattern is associated with the bit value in the DCI field. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving control information in a master information block (MIB) on a physical broadcast channel (PBCH) from the base station; determining the starting downlink symbol index of the PDSCH based at least in part on the control information in the MIB; and determining the ending downlink symbol index of the PDSCH based at least in part on receiving control information in a DCI on a physical downlink control channel (PDCCH) from the base station, wherein decoding the PDSCH is based at least in part on the starting downlink symbol index and the ending downlink symbol index. ### Claim 7 A method for wireless communication, comprising: identifying, at a base station, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information to a user equipment (UE) while the UE is outside of a radio resource control (RRC) connected state, the length being from a starting downlink symbol index to an ending downlink symbol index; and transmitting, before a radio resource control (RRC) configuration procedure between the UE and the base station, the indication to the UE. ### Claim 8 (depends on 7) The method of claim 7, wherein the broadcast information comprises remaining minimum system information (RMSI) or other system information (OSI), or both. ### Claim 9 (depends on 7) The method of claim 7, further comprising: providing, to the UE, an indication of the starting downlink symbol index based at least in part on transmitting control information in a master information block (MIB) on a physical broadcast channel (PBCH). ### Claim 10 (depends on 7) The method of claim 7, further comprising: assigning a set of downlink symbols for transmission of the PDSCH carrying the broadcast information based at least in part on a preconfigured rule; and scheduling the PDSCH based at least in part on the assigned set of downlink symbols. ### Claim 11 (depends on 10) The method of claim 10, wherein the assigned set of downlink symbols is variable based at least in part on the PDSCH carrying RMSI or OSI. ### Claim 12 (depends on 10) The method of claim 10, further comprising: identifying a plurality of downlink symbols associated with a slot of a frame; and determining that the identified plurality of downlink symbols satisfy the assigned set of downlink symbols, wherein scheduling the PDSCH is based at least in part on the identified plurality of downlink symbols satisfying the assigned set of downlink symbols used to transmit the PDSCH. ### Claim 13 (depends on 12) The method of claim 12, further comprising: determining that the identified plurality of downlink symbols is less than the assigned set of downlink symbols; and refraining from scheduling the PDSCH during the slot. ### Claim 14 (depends on 12) The method of claim 12, further comprising: determining that the identified plurality of downlink symbols is greater than the assigned set of downlink symbols; and truncating a set of unused downlink symbols associated with the slot, wherein scheduling the PDSCH is based at least in part on the truncating. ### Claim 15 (depends on 14) The method of claim 14, further comprising: puncturing the set of unused downlink symbols associated with the slot. ### Claim 16 (depends on 10) The method of claim 10, further comprising: determining a minimum set of downlink symbols for transmission of the PDSCH carrying the broadcast information; and determining a maximum set of downlink symbols for transmission of the PDSCH carrying the broadcast information. ### Claim 17 (depends on 7) The method of claim 7, further comprising: transmitting the indication of the length of downlink symbols in a downlink control information (DCI) on a physical downlink control channel (PDCCH). ### Claim 18 (depends on 7) The method of claim 7, further comprising: determining the length of downlink symbols used to transmit the PDSCH carrying broadcast information based at least in part on a preconfigured rule; and assigning a bit value associated with a DCI field of the DCI, the bit value indicating the length of downlink symbols. ### Claim 19 An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive, from a base station and while being outside of a radio resource control (RRC) connected state, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information, the length being from a starting downlink symbol index to an ending downlink symbol index, wherein the indication of the length of downlink symbols used to transmit the PDSCH is received before a radio resource control (RRC) configuration procedure between the UE and the base station; and decode the PDSCH based at least in part on the indication. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the broadcast information comprises remaining minimum system information (RMSI) or other system information (OSI), or both. ### Claim 21 (depends on 19) The apparatus of claim 19, wherein the length is a fixed length of downlink symbols. ### Claim 22 (depends on 19) The apparatus of claim 19, wherein the instructions are further executable by the processor to cause the apparatus to: receive a downlink control information (DCI) from the base station, wherein the indication of the length of downlink symbols used to transmit the PDSCH by the base station is received in the DCI. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to: identify the length of downlink symbols used to transmit the PDSCH based at least in part on a bit value in a DCI field received in the DCI, wherein a demodulation reference signal (DMRS) pattern is associated with the bit value in the DCI field. ### Claim 24 (depends on 19) The apparatus of claim 19, wherein the instructions are further executable by the processor to cause the apparatus to: receive control information in a master information block (MIB) on a physical broadcast channel (PBCH) from the base station; determine the starting downlink symbol index of the PDSCH based at least in part on the control information in the MIB; and determine the ending downlink symbol index of the PDSCH based at least in part on receiving control information in a DCI on a physical downlink control channel (PDCCH) from the base station, wherein decoding the PDSCH is based at least in part on the starting downlink symbol index and the ending downlink symbol index. ### Claim 25 An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: identify, at a base station, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information to a user equipment (UE) while the UE is outside of a radio resource control (RRC) connected state, the length being from a starting downlink symbol index to an ending downlink symbol index; and transmit, before a radio resource control (RRC) configuration procedure between the UE and the base station, the indication to the UE. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the broadcast information comprises remaining minimum system information (RMSI) or other system information (OSI), or both. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: provide, to the UE, an indication of the starting downlink symbol index based at least in part on transmitting control information in a master information block (MIB) on a physical broadcast channel (PBCH). ### Claim 28 (depends on 25) The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: assign a set of downlink symbols for transmission of the PDSCH carrying the broadcast information based at least in part on a preconfigured rule; and schedule the PDSCH based at least in part on the assigned set of downlink symbols. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein the assigned set of downlink symbols is variable based at least in part on the PDSCH carrying RMSI or OSI. ### Claim 30 (depends on 28) The apparatus of claim 28, wherein the instructions are further executable by the processor to cause the apparatus to: identify a plurality of downlink symbols associated with a slot of a frame; and determine that the identified plurality of downlink symbols satisfy the assigned set of downlink symbols, wherein scheduling the PDSCH is based at least in part on the identified plurality of downlink symbols satisfying the assigned set of downlink symbols used to transmit the PDSCH. ### Claim 31 (depends on 30) The apparatus of claim 30, wherein the instructions are further executable by the processor to cause the apparatus to: determine that the identified plurality of downlink symbols is less than the assigned set of downlink symbols; and refrain from scheduling the PDSCH during the slot. ### Claim 32 (depends on 30) The apparatus of claim 30, wherein the instructions are further executable by the processor to cause the apparatus to: determine that the identified plurality of downlink symbols is greater than the assigned set of downlink symbols; and truncate a set of unused downlink symbols associated with the slot, wherein scheduling the PDSCH is based at least in part on the truncating. ### Claim 33 (depends on 32) The apparatus of claim 32, wherein the instructions are further executable by the processor to cause the apparatus to: puncture the set of unused downlink symbols associated with the slot. ### Claim 34 (depends on 28) The apparatus of claim 28, wherein the instructions are further executable by the processor to cause the apparatus to: determine a minimum set of downlink symbols for transmission of the PDSCH carrying the broadcast information; and determine a maximum set of downlink symbols for transmission of the PDSCH carrying the broadcast information. ### Claim 35 (depends on 25) The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: transmit the indication of the length of downlink symbols in a downlink control information (DCI) on a physical downlink control channel (PDCCH). ### Claim 36 (depends on 25) The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: determine the length of downlink symbols used to transmit the PDSCH carrying broadcast information based at least in part on a preconfigured rule; and assign a bit value associated with a DCI field of the DCI, the bit value indicating the length of downlink symbols. ### Claim 37 An apparatus for wireless communication, comprising: means for receiving, from a base station and while being outside of a radio resource control (RRC) connected state, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information, the length being from a starting downlink symbol index to an ending downlink symbol index, wherein the indication of the length of downlink symbols used to transmit the PDSCH is received before a radio resource control (RRC) configuration procedure between the UE and the base station; and means for decoding the PDSCH based at least in part on the indication. ### Claim 38 (depends on 37) The apparatus of claim 37, further comprising: means for receiving a downlink control information (DCI) from the base station, wherein the indication of the length of downlink symbols used to transmit the PDSCH by the base station is received in the DCI. ### Claim 39 (depends on 38) The apparatus of claim 38, further comprising: means for identifying the length of downlink symbols used to transmit the PDSCH based at least in part on a bit value in a DCI field received in the DCI, wherein a demodulation reference signal (DMRS) pattern is associated with the bit value in the DCI field. ### Claim 40 An apparatus for wireless communication, comprising: means for identifying, at a base station, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information to a user equipment (UE) while the UE is outside of a radio resource control (RRC) connected state, the length being from a starting downlink symbol index to an ending downlink symbol index; and means for transmitting, before a radio resource control (RRC) configuration procedure between the UE and the base station, the indication to the UE. ### Claim 41 (depends on 40) The apparatus of claim 40, further comprising: means for transmitting the indication of the length of downlink symbols in a downlink control information (DCI) on a physical downlink control channel (PDCCH). ### Claim 42 (depends on 40) The apparatus of claim 40, further comprising: means for determining the length of downlink symbols used to transmit the PDSCH carrying broadcast information based at least in part on a preconfigured rule; and assigning a bit value associated with a DCI field of the DCI, the bit value indicating the length of downlink symbols. ### Claim 43 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: receive, from a base station and while being outside of a radio resource control (RRC) connected state, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information, the length being from a starting downlink symbol index to an ending downlink symbol index, wherein the indication of the length of downlink symbols used to transmit the PDSCH is received before a radio resource control (RRC) configuration procedure between the UE and the base station; and decode the PDSCH based at least in part on the indication. ### Claim 44 (depends on 43) The non-transitory computer-readable medium of claim 43, further comprising code executable to: receive a downlink control information (DCI) from the base station, wherein the indication of the length of downlink symbols used to transmit the PDSCH by the base station is received in the DCI. ### Claim 45 (depends on 44) The non-transitory computer-readable medium of claim 44, further comprising code executable to: identify the length of downlink symbols used to transmit the PDSCH based at least in part on a bit value in a DCI field received in the DCI, wherein a demodulation reference signal (DMRS) pattern is associated with the bit value in the DCI field. ### Claim 46 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: identify, at a base station, an indication of a length of downlink symbols used to transmit a physical downlink shared channel (PDSCH) that carries broadcast information to a user equipment (UE) while the UE is outside of a radio resource control (RRC) connected state, the length being from a starting downlink symbol index to an ending downlink symbol index; and transmit, before a radio resource control (RRC) configuration procedure between the UE and the base station, the indication to the UE. ### Claim 47 (depends on 46) The non-transitory computer-readable medium of claim 46, further comprising code executable to: transmit the indication of the length of downlink symbols in a downlink control information (DCI) on a physical downlink control channel (PDCCH). ### Claim 48 (depends on 46) The non-transitory computer-readable medium of claim 46, further comprising code executable to: determine the length of downlink symbols used to transmit the PDSCH carrying broadcast information based at least in part on a preconfigured rule; and assign a bit value associated with a DCI field of the DCI, the bit value indicating the length of downlink symbols.