# US 12,004,231 B1 · Non-blind scheduling of a physical downlink control channel (PDCCH) control channel element (CCE) aggregation level (AL) for common search space (CSS) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,231 B1 - Document ID: US12004231B1 - Status: Granted - Kind: B1 - Application number: 17/391,901 - Filed: 2021-08-02 - Granted: 2024-06-04 - Earliest claimed: 2021-08-02 - Assignees: T-Mobile Innovations LLC - Applicants: T-Mobile Innovations LLC - Inventors: Sanghoon Sung - Web page: https://patentgrep.com/patent/US12004231B1 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 74/0841: {with collision treatment} - H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows - H04W 72/542: using measured or perceived quality - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04B 7/0608: {Antenna selection according to transmission parameters} - H04W 74/0833: Random access procedures, e.g. with 4-step access - 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) - H04B: TRANSMISSION ## Abstract Methods, media, and systems are provided for supporting non-blind scheduling of a physical downlink control channel (PDCCH) control channel element (CCE) aggregation level (AL) for a common search space (CSS). In aspects, one or more signals corresponding to a device are received. Additionally, a request for a random-access channel response is received from the device. In addition, a radio frequency condition for the device is determined based on the one or more signals. Upon receiving the request and based on the radio frequency condition, an assigned physical random access channel (PRACH) preamble group is broadcast to the device via a broadcasting message, the PRACH preamble group corresponding to the CSS and also for scheduling the PDCCH CCE AL. ## Claims ### Claim 1 A system for supporting a non-blind scheduling of a physical downlink control channel (PDCCH) aggregation level (AL) for a search space, the system comprising: an antenna array comprising one or more antenna elements; and one or more processors configured to execute operations comprising: receiving one or more signals corresponding to a device; receiving a request for a random-access channel response from the device; determining a radio frequency condition for the device based on the one or more signals; and upon receiving the request and based on the radio frequency condition, broadcasting an assigned physical random access channel (PRACH) preamble group to the device for scheduling the PDCCH AL, the assigned PRACH preamble group corresponding to the search space. ### Claim 2 (depends on 1) The system of claim 1, wherein the search space is a common search space (CSS), wherein the AL is a PDCCH control channel element (CCE) AL, and wherein the system further comprises: determining the PDCCH CCE AL for the device based on the assigned PRACH preamble group; and scheduling the PDCCH CCE AL for the device. ### Claim 3 (depends on 1) The system of claim 1, wherein the search space is a common search space (CSS), wherein the AL is a PDCCH control channel element (CCE) AL, and wherein the system further comprises: assigning a first set of consecutive PRACH preambles to a first PRACH preamble group; assigning a second set of consecutive PRACH preambles to a second PRACH preamble group, the second set of consecutive PRACH preambles having higher preamble IDs than the first set; and scheduling the PDCCH CCE AL for the device based on the assigned PRACH preamble group being the first PRACH preamble group or the second PRACH preamble group. ### Claim 4 (depends on 3) The system of claim 3, wherein the one or more signals includes a downlink reference signal received power (RSRP), wherein the radio frequency condition corresponds to whether the downlink RSRP is above a threshold; and wherein the operations further comprise: determining the threshold for the radio frequency condition; broadcasting the threshold to the device; and based on broadcasting the threshold, receiving a response from the device. ### Claim 5 (depends on 4) The system of claim 4, wherein the operations further comprise: based on the response, determining that the downlink RSRP is above the threshold; assigning the device to the first PRACH preamble group; and determining the PDCCH CCE AL for the device based on the first PRACH preamble group. ### Claim 6 (depends on 5) The system of claim 5, wherein the PDCCH CCE AL is four. ### Claim 7 (depends on 4) The system of claim 4, wherein the operations further comprise: based on the response, determining that the downlink RSRP is below the threshold; assigning the device to the second PRACH preamble group; and determining the PDCCH CCE AL for the device based on the second PRACH preamble group. ### Claim 8 (depends on 7) The system of claim 7, wherein the PDCCH CCE AL is eight. ### Claim 9 (depends on 1) The system of claim 1, wherein broadcasting the assigned PRACH preamble group to the device includes transmitting a PRACH group number in a system information broadcasting message, and wherein a total number of PRACH preambles is 64. ### Claim 10 (depends on 1) The system of claim 1, wherein the antenna array has at least one node and the at least one node is a gNodeB. ### Claim 11 A method for non-blind scheduling of a physical downlink control channel (PDCCH) aggregation level (AL) for a search space, the method comprising: receiving one or more signals corresponding to a device; receiving a request for a random-access channel response from the device; determining a radio frequency condition for the device based on the one or more signals; based on the radio frequency condition, determining a physical random access channel (PRACH) preamble group for the device for scheduling the PDCCH AL, the PRACH preamble group corresponding to the search space; and upon receiving the request, broadcasting the PRACH preamble group to the device. ### Claim 12 (depends on 11) The method of claim 11, further comprising scheduling the PDCCH AL for the device based on the PRACH preamble group. ### Claim 13 (depends on 11) The method of claim 11, further comprising: assigning a first set of consecutive PRACH preambles to a first PRACH preamble group; assigning a second set of consecutive PRACH preambles to a second PRACH preamble group, the second set of consecutive PRACH preambles having higher preamble IDs than the first set; and scheduling the PDCCH AL for the device based on the PRACH preamble group being the first PRACH preamble group or the second PRACH preamble group. ### Claim 14 (depends on 13) The method of claim 13, wherein the search space is a common search space (CSS), wherein the AL is a PDCCH control channel element (CCE) AL, wherein the one or more signals includes a downlink signal-to-interference-plus-noise ratio (SINK), wherein the radio frequency condition corresponds to whether the downlink SINR is above a threshold, and wherein the method further comprises: determining the threshold for the radio frequency condition; broadcasting the threshold to the device; and based on broadcasting the threshold, receiving a response from the device. ### Claim 15 (depends on 14) The method of claim 14, the method further comprising: based on the response, determining that the downlink SINK is above the threshold; assigning the device to the first PRACH preamble group; and determining the PDCCH CCE AL for the device based on the first PRACH preamble group. ### Claim 16 (depends on 15) The method of claim 15, wherein the PDCCH CCE AL is four. ### Claim 17 (depends on 14) The method of claim 14, further comprising: based on the response, determining that the downlink SINR is below the threshold; assigning the device to the second PRACH preamble group; and determining the PDCCH AL for the device based on the second PRACH preamble group. ### Claim 18 (depends on 17) The method of claim 17, wherein the PDCCH CCE AL is eight. ### Claim 19 Non-transitory computer-readable storage media having computer-executable instructions embodied thereon that, when executed by one or more processors, cause the one or more processors to perform operations for non-blind scheduling of a physical downlink control channel (PDCCH) aggregation level (AL) for a search space, the operations comprising: receiving one or more downlink signals corresponding to a device; receiving a request for a random-access channel response from the device; determining a radio frequency condition for the device based on the one or more downlink signals, the radio frequency condition corresponding to whether the one or more downlink signals is above a threshold; based on the radio frequency condition, determining a physical random access channel (PRACH) preamble group for the device for scheduling the PDCCH AL, the PRACH preamble group corresponding to the search space; and upon receiving the request, broadcasting the PRACH preamble group to the device. ### Claim 20 (depends on 19) The non-transitory computer-readable storage media of claim 19, wherein the search space is a common search space, wherein the AL is a PDCCH control channel element AL, and wherein the one or more downlink signals correspond to a signal-to-interference-plus-noise ratio (SINR) or a reference signal received power (RSRP).