# US 2021/0243611 A1 · Dynamic spectrum partitioning between a first radio access technology and a second radio access technology > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243611 A1 - Document ID: US20210243611A1 - Status: Published application - Kind: A1 - Application number: 17/235,662 - Filed: 2021-04-20 - Published: 2021-08-05 - Earliest claimed: 2016-03-06 - Assignees: AT&T Intellectual Property I, L.P. - Applicants: AT&T Intellectual Property I, L.P. - Inventors: Arunabha Ghosh; David R. Wolter - Web page: https://patentgrep.com/patent/US20210243611A1 ## CPC - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0062: {Avoidance of ingress interference, e.g. ham radio channels} - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04W 16/10: Dynamic resource partitioning - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - 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 An eNodeB uses a first portion of a frequency spectrum as a primary cell and uses a second portion of the frequency spectrum as a secondary cell that is dynamically shared with a 5G base station. The eNodeB and the 5G base station communicate to dynamically share the second portion of the frequency spectrum. ## Claims ### Claim 1 A system comprising: a first base station utilizing a first radio access technology to communicate with first user equipment, wherein the first base station uses a frequency spectrum during a first time period; and a second base station utilizing a second radio access technology to communicate with second user equipment, wherein the second base station uses a portion of the frequency spectrum during a second time period, wherein the second base station is configured to send to the first base station a request that the first base station make the portion of the frequency spectrum available for use during the first time period by the second base station, wherein the second user equipment is configured to determine that the portion of the frequency spectrum is unavailable during the first time period responsive to a detected absence of one or more pilot tones in the portion of the frequency spectrum in the first time period. ### Claim 2 (depends on 1) The system of claim 1, wherein the portion of the frequency spectrum comprises a second portion of the frequency spectrum, wherein the first base station uses a first portion of the frequency spectrum as a primary cell and uses the second portion of the frequency spectrum as a secondary cell aggregated with the primary cell during the first time period. ### Claim 3 (depends on 2) The system of claim 2, wherein the first base station and the second base station communicate regarding availability of the second portion of the frequency spectrum via an interface between the first base station and the second base station. ### Claim 4 (depends on 1) The system of claim 1, wherein the second user equipment does not perform measurement procedures on the portion of the frequency spectrum responsive to the detected absence of the one or more pilot tones in the portion of the frequency spectrum, wherein the absence of the one or more pilot tones is detected by the second user equipment after having detected a presence of pilot tones in the portion of the frequency spectrum. ### Claim 5 (depends on 4) The system of claim 4, wherein the second user equipment periodically performs checking for the presence of pilot tones after detecting the absence of the one or more pilot tones. ### Claim 6 (depends on 5) The system of claim 5, wherein the second user equipment resumes performing the measurement procedures on the portion of the frequency spectrum responsive to detecting the presence of pilot tones while performing the checking. ### Claim 7 (depends on 1) The system of claim 1, wherein the first base station performs deactivating of the portion of the frequency spectrum responsive to the request, and wherein the first base station signals the second base station regarding the deactivating. ### Claim 8 (depends on 1) The system of claim 1, wherein the second base station signals the first base station regarding an availability of the portion of the frequency spectrum for utilization by the first base station. ### Claim 9 (depends on 8) The system of claim 8, wherein the second base station deactivates subcarriers in a primary cell of the second base station in the portion of the frequency spectrum to make the portion of the frequency spectrum available for use by the first base station. ### Claim 10 A method comprising: dynamically sharing, by a processing system including a processor and utilizing a first radio access technology, a frequency spectrum with a second radio access technology, wherein a first base station utilizes the first radio access technology to communicate with first user equipment, the first base station using the frequency spectrum during a first time period; and wherein a second base station utilizes a second radio access technology to communicate with second user equipment, the second base station using a portion of the frequency spectrum during a second time period, wherein the second base station is configured to send to the first base station a request that the first base station make the portion of the frequency spectrum available for use during the first time period by the second base station, wherein the second user equipment is configured to determine that the portion of the frequency spectrum is unavailable during the first time period responsive to a detected absence of one or more pilot tones in the portion of the frequency spectrum in the first time period. ### Claim 11 (depends on 10) The method of claim 10, wherein the portion of the frequency spectrum comprises a second portion of the frequency spectrum, wherein the first base station uses a first portion of the frequency spectrum as a primary cell and uses the second portion of the frequency spectrum as a secondary cell aggregated with the primary cell during the first time period. ### Claim 12 (depends on 11) The method of claim 11, wherein the first base station and the second base station communicate regarding availability of the second portion of the frequency spectrum via an interface between the first base station and the second base station. ### Claim 13 (depends on 10) The method of claim 10, wherein the second user equipment does not perform measurement procedures on the portion of the frequency spectrum responsive to the detected absence of the one or more pilot tones in the portion of the frequency spectrum, wherein the absence of the one or more pilot tones is detected by the second user equipment after having detected a presence of pilot tones in the portion of the frequency spectrum. ### Claim 14 (depends on 10) The method of claim 10, wherein the first base station performs deactivating of the portion of the frequency spectrum responsive to the request, and wherein the first base station signals the second base station regarding the deactivating. ### Claim 15 (depends on 10) The method of claim 10, wherein the second base station signals the first base station regarding an availability of the portion of the frequency spectrum for utilization by the first base station. ### Claim 16 A device comprising: a processing system including a processor; and a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations comprising: dynamically sharing, by a first radio access technology, a frequency spectrum with a second radio access technology, wherein a first base station utilizes the first radio access technology to communicate with first user equipment, the first base station using the frequency spectrum during a first time period; and wherein a second base station utilizes the second radio access technology to communicate with second user equipment, the second base station using a portion of the frequency spectrum during a second time period, wherein the second base station is configured to send to the first base station a request that the first base station make the portion of the frequency spectrum available for use during the first time period by the second base station, wherein the second user equipment is configured to determine that the portion of the frequency spectrum is unavailable during the first time period responsive to a detected absence of one or more pilot tones in the portion of the frequency spectrum in the first time period. ### Claim 17 (depends on 16) The device of claim 16, wherein the portion of the frequency spectrum comprises a second portion of the frequency spectrum, wherein the first base station uses a first portion of the frequency spectrum as a primary cell and uses the second portion of the frequency spectrum as a secondary cell aggregated with the primary cell during the first time period. ### Claim 18 (depends on 17) The device of claim 17, wherein the first base station and the second base station communicate regarding availability of the second portion of the frequency spectrum via an interface between the first base station and the second base station. ### Claim 19 (depends on 16) The device of claim 16, wherein the second user equipment does not perform measurement procedures on the portion of the frequency spectrum responsive to the detected absence of the one or more pilot tones in the portion of the frequency spectrum, wherein the absence of the one or more pilot tones is detected by the second user equipment after having detected a presence of pilot tones in the portion of the frequency spectrum. ### Claim 20 (depends on 19) The device of claim 19, wherein the second user equipment periodically performs checking for the presence of pilot tones after detecting the absence of the one or more pilot tones, and wherein the second user equipment resumes performing the measurement procedures on the portion of the frequency spectrum responsive to detecting the presence of pilot tones while performing the checking.