# US 12,764,733 B2 · Cell monitoring in cross-carrier scheduling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,764,733 B2 - Document ID: US12764733B2 - Status: Granted - Kind: B2 - Application number: 18/018,980 - Filed: 2021-08-06 - Published: 2023-09-07 - Granted: 2026-10-13 - Earliest claimed: 2020-08-06 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Ravikiran Nory; Ajit Nimbalker; Zhenhua Zou - Web page: https://patentgrep.com/patent/US12764733B2 ## CPC - H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows - H04L 1/0061: {Error detection codes} - H04W 72/232: the control data signalling from the physical layer, e.g. DCI signalling - 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 A communication device can operate in a communications network and be configured to communicate with a network node operating in the communications network via a primary cell, PCell, and a secondary cell, SCell. The communication device can receive a configuration message from the network node indicating to monitor the SCell for first scheduling information associated with communications via the PCell. Responsive to receiving the configuration message, the communication device can monitor the SCell for the first scheduling information associated with communication via the PCell. Responsive to receiving the configuration message, the communication device can monitor the PCell for second scheduling information associated with communication via the PCell. Responsive to receiving the configuration message, the communication device can receive, via the SCell, the first scheduling information associated with communication via the PCell. ## Claims ### Claim 1 A method of operating a communication device operating in a communications network and configured to communicate with a network node operating in the communications network via a primary cell, PCell, and one or more secondary cells, SCells, the method comprising: receiving a configuration message from the network node to configure an SCell of the one or more SCells as a scheduling cell for cross carrier scheduling wherein when the configuration message configures the SCell as the scheduling cell the communication device is configured to: monitor the SCell for first scheduling information associated with communications via the PCell; only monitor the PCell for second scheduling information associated with second communications for the PCell and not monitor the PCell for any scheduling information associated with communications for any SCells of the one or more SCells; and only monitor for scheduling related to communications for the SCell configured for scheduling on the SCell. ### Claim 2 (depends on 1) The method of claim 1, further comprising: responsive to receiving the configuration message from the network node, monitoring the PCell only for scheduling information associated with communication via the PCell and monitor on the SCell for scheduling information for the PCell and scheduling information for at least one other SCell. ### Claim 3 (depends on 1) The method of claim 1, further comprising: monitoring, when the SCell configured for scheduling is deactivated, physical downlink control channel, PDCCH, candidates on the PCell for PDCCH downlink control information, DCI, formats that schedule the communications on the PCell and/or on at least one other SCell and ceasing to monitor for PDCCH candidates on the SCell for communication on the PCell. ### Claim 4 (depends on 1) The method of claim 1, wherein monitoring the SCell for the first scheduling information associated with communication via the PCell comprises monitoring a second set of physical downlink control channel, PDCCH, candidates that belong to a communication device-specific search space configured for the SCell, and wherein monitoring the PCell for the second scheduling information associated with communication via the PCell comprises monitoring a subset of a set of PDCCH candidates that belong to a common search space or a device-specific search space configured for the PCell. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving, via the PCell, the second scheduling information associated with communication via the PCell, wherein receiving the first scheduling information and receiving the second scheduling information comprises: responsive to monitoring the PCell for the second scheduling information, detecting a first PDCCH DCI format in the PCell with cyclic redundancy check, CRC, scrambled by specific cell radio network temporary identifier, C-RNTI, scheduling a first communication with the network node via the PCell, the first PDCCH DCI format ending in a first symbol of the PCell; and responsive to monitoring the SCell for the first scheduling information, detecting a second PDCCH DCI format in the SCell with cyclic redundancy check, CRC, scrambled by specific cell radio network temporary identifier, C-RNTI, scheduling a second communication with the network node via the PCell, the second PDCCH DCI format ending in a second symbol of the SCell, the end of the first symbol being earlier than the end of the second symbol. ### Claim 6 (depends on 5) The method of claim 5, wherein the second communication starts after the end of the first communication, the method further comprising: performing the first communication with the network node and the second communication with the network node. ### Claim 7 (depends on 4) The method of claim 4, wherein receiving the configuration message comprises: receiving a first search space set configuration with a first search space index; and receiving a second search space set configuration with a second search space index, the second search space set being linked to the first search space set and the second search space set configuration including a first number of physical downlink control channel, PDCCH, candidates, wherein monitoring the SCell comprises monitoring the second set of PDCCH candidates on the SCell, and wherein receiving the first scheduling information comprises detecting a first PDCCH downlink control information, DCI, format by monitoring the second set of PDCCH candidates on the SCell. ### Claim 8 (depends on 7) The method of claim 7, wherein the communication device is configured with a set of PDCCH candidates is determined based on at least one of: the first number of PDCCH candidates included in the second search space set configuration; and the first set of search space parameters included in the first search space set configuration, wherein the first set of search space parameters include one or more of: a first control resource set index; a first periodicity, first offset, and first duration for determining slots corresponding to the search space; and a first indication of PDCCH DCI formats to be monitored. ### Claim 9 (depends on 1) The method of claim 1, wherein the communication device is configured with a set of search space parameters including at least one of: a second control resource set index; a second periodicity, second offset, and second duration for determining slots corresponding to the search space; and a second indication of PDCCH DCI formats to be monitored, the method further comprising: detecting a second PDCCH DCI format by monitoring a third set of PDCCH candidates on the PCell; and communicating on the PCell that is scheduled by the detected second PDCCH DCI format. ### Claim 10 (depends on 7) The method of claim 7, further comprising: monitoring a third set of PDCCH candidates on the PCell in response to at least one of the following: the first search space set configuration is deactivated on the SCell; and an active bandwidth part, BWP, of the SCell is switched from a first BWP with the first search space set configuration to a second BWP without a search space set configuration linked to the second search space set configuration. ### Claim 11 A method of operating a network node operating in a communications network and configured to communicate with a communication device operating in the communications network via a primary cell, PCell, and one or more secondary cells, SCells, the method comprising transmitting a configuration message from the network node to configure an SCell of the one or more SCells as a scheduling cell for cross carrier scheduling wherein when the configuration message configures the SCell as the scheduling cell the communication device is configured to: monitor the SCell for first scheduling information associated with communications via the PCell; only monitor the PCell for second scheduling information associated with second communications with the PCell and not monitor the PCell for any scheduling information associated with communications for any SCells of the one of more SCells; and only monitor for scheduling related to communications for the SCell configured for scheduling on the SCell. ### Claim 12 (depends on 11) The method of claim 11, further comprising: transmitting the first scheduling information on the scheduling SCell and transmitting the second scheduling information on the PCell based on communication with the network node via the PCell based on the configuration message. ### Claim 13 (depends on 1) A communication device operating in a communications network and configured to communicate with a network node operating in the communications network via a primary cell, PCell, and a secondary cell, SCell, the communication device comprising: processing circuitry; and memory coupled to the processing circuitry and having instructions stored therein that are executable by the processing circuitry to cause the communication device to perform any of the operations of claim 1. ### Claim 14 (depends on 11) A network node operating in a communications network and configured to communicate with a communication device operating in the communications network via a primary cell, PCell, and a secondary cell, SCell, the network node comprising: processing circuitry; and memory coupled to the processing circuitry and having instructions stored therein that are executable by the processing circuitry to cause the network node to perform any of the operations of claim 11. ### Claim 15 A computer program comprising a non-transitory computer readable medium storing program code to be executed by processing circuitry whereby execution of the program code causes the processing circuitry to receive a configuration message from a network node to configure a secondary cell, SCell, of one or more SCells as a scheduling cell for cross carrier scheduling wherein when the configuration message configures the SCell as the scheduling cell a communication device is configured to: monitor the SCell for first scheduling information associated with communications via a primary cell, PCell; only monitor the PCell for second scheduling information associated with second communications for the PCell and not monitor the PCell for any scheduling information associated with communications for any SCells of the one or more SCells; and only monitor for scheduling related to communications for the SCell configured for scheduling on the SCell. ### Claim 16 (depends on 1) The method of claim 1, wherein monitoring the PCell for the second scheduling information associated with communication via the PCell comprises monitoring a subset of a set of PDCCH candidates that belong to a device-specific search space configured for the PCell. ### Claim 17 (depends on 1) The method of claim 1, further comprising: responsive to monitoring the PCell for the second scheduling information, detecting a first PDCCH DCI format in the PCell, the first PDCCH DCI format ending in a first symbol of the PCell; and responsive to monitoring the SCell for the first scheduling information, detecting a second PDCCH DCI format in the SCell, the second PDCCH DCI format ending in a second symbol of the SCell, the end of the first symbol being earlier than the end of the second symbol.