# US 12,003,431 B2 · Downlink control channel in wireless systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,431 B2 - Document ID: US12003431B2 - Status: Granted - Kind: B2 - Application number: 17/484,946 - Filed: 2021-09-24 - Published: 2022-01-13 - Granted: 2024-06-04 - Earliest claimed: 2015-08-25 - Assignees: InterDigital Patent Holdings, Inc. - Applicants: InterDigital Patent Holdings, Inc. - Inventors: Moon-il Lee; Paul Marinier; Diana Pani; Benoit Pelletier; Ghyslain Pelletier; Marian Rudolf - Web page: https://patentgrep.com/patent/US12003431B2 ## CPC - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04J 11/0069: {Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0087: {when data requirements change} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Systems, methods, and instrumentalities may be disclosed for implementing a flexible radio access communication system. A flexible radio access communication system may be supported using spectrum of varying size, including aggregation of non-adjacent carriers in the same and/or in different frequency bands. A wireless transmit/receive unit (WTRU) may receive a first transmission via a common downlink control channel. The first transmission may include first control information. The first control information may include information regarding the configuration of a first dedicated downlink control channel of one or more dedicated control channels. The WTRU may receive a second transmission via the first dedicated downlink control channel of the dedicated control channels. The second transmission may include second control information. The second control information may be associated with a transmission of a first transmission type. The dedicated downlink control channels may be used for providing control information associated with different types of transmissions. ## Claims ### Claim 1 A network element associated with a base station, the network element configured to: transmit a first downlink control channel transmission within a first bandwidth region, wherein the first bandwidth region is 1) a subset of a system bandwidth and 2) was used by a wireless transmit/receive unit (WTRU) when initially accessing the network element; transmit configuration information related to: 1) a second downlink control channel transmission associated with a second bandwidth region of the system bandwidth and 2) a set of search spaces associated with the second bandwidth region; and transmit the second downlink control channel transmission within the second bandwidth region. ### Claim 2 (depends on 1) The network element of claim 1, wherein the configuration information related to the second downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type. ### Claim 3 (depends on 2) The network element of claim 2, wherein the numerology comprises any of: a subcarrier spacing, a time symbol length, or a cyclic prefix. ### Claim 4 (depends on 1) The network element of claim 1, wherein the network element is further configured to transmit an indication in the first downlink control channel transmission. ### Claim 5 (depends on 1) The network element of claim 1, wherein each of the first and second bandwidth regions is associated with a respective set of contiguous physical resource blocks. ### Claim 6 (depends on 1) The network element of claim 1, wherein the first downlink control channel transmission is a common control channel transmission, and the second downlink control channel transmission is a dedicated control channel transmission. ### Claim 7 (depends on 1) The network element of claim 1, wherein the configuration information indicates a time and frequency location of the second downlink control channel transmission associated with the second bandwidth region. ### Claim 8 (depends on 1) The network element of claim 1, wherein the first and second bandwidth regions are each associated with a different numerology. ### Claim 9 (depends on 1) The network element of claim 1, wherein the configuration information is transmitted using radio resource control signaling. ### Claim 10 (depends on 1) The network element of claim 1, wherein the configuration information indicates a first set of search spaces associated with the first bandwidth region is different from a second set of search spaces associated with the second bandwidth region. ### Claim 11 (depends on 1) The network element of claim 1, wherein the configuration information indicates any of: a first subcarrier spacing associated with the first bandwidth region is different from a second subcarrier spacing associated with the second bandwidth region, or a first cyclic prefix associated with the first bandwidth region is different from a second cyclic prefix associated with the second bandwidth region. ### Claim 12 A method implemented by a network element associated with a base station, the method comprising: transmitting a first downlink control channel transmission within a first bandwidth region, wherein the first bandwidth region is 1) a subset of a system bandwidth and 2) was used by a wireless transmit/receive unit (WTRU) when initially accessing the base network element; transmitting configuration information related to: 1) a second downlink control channel transmission associated with a second bandwidth region of the system bandwidth and 2) a set of search spaces associated with the second bandwidth region; and transmitting the second downlink control channel transmission within the second bandwidth region. ### Claim 13 (depends on 12) The method of claim 12, wherein the configuration information related to the second downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type. ### Claim 14 (depends on 13) The method of claim 13, wherein the numerology comprises any of: a subcarrier spacing, a time symbol length, or a cyclic prefix. ### Claim 15 (depends on 12) The method of claim 12, wherein each of the first and second bandwidth regions is associated with a respective set of contiguous physical resource blocks. ### Claim 16 (depends on 12) The method of claim 12, wherein the first downlink control channel transmission is a common control channel transmission, and the second downlink control channel transmission is a dedicated control channel transmission. ### Claim 17 (depends on 12) The method of claim 12, wherein the configuration information indicates a time and frequency location of the second downlink control channel transmission associated with the second bandwidth region. ### Claim 18 (depends on 12) The method of claim 12, wherein the first and second bandwidth regions are each associated with a different numerology. ### Claim 19 (depends on 12) The method of claim 12, wherein the configuration information is transmitted using radio resource control signaling. ### Claim 20 (depends on 12) The method of claim 12, wherein the configuration information indicates any of: a first set of search spaces associated with the first bandwidth region is different from a second set of search spaces associated with the second bandwidth region, a first subcarrier spacing associated with the first bandwidth region is different from a second subcarrier spacing associated with the second bandwidth region, or a first cyclic prefix associated with the first bandwidth region is different from a second cyclic prefix associated with the second bandwidth region.