# US 11,910,247 B2 · Method and device for switching between different radio access technologies > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,247 B2 - Document ID: US11910247B2 - Status: Granted - Kind: B2 - Application number: 17/466,076 - Filed: 2021-09-03 - Published: 2022-04-07 - Granted: 2024-02-20 - Earliest claimed: 2020-10-06 - Assignees: Mediatek Inc. - Applicants: Mediatek Inc. - Inventors: Chih-Yuan Tsai; Tsung-Ming Lee; Ho-Wen Pu - Web page: https://patentgrep.com/patent/US11910247B2 ## CPC - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - H04W 48/18: Selecting a network or a communication service - H04W 36/00222: {between different packet switched [PS] network technologies, e.g. transferring data sessions between LTE and WLAN or LTE and 5G} - H04W 36/00837: {Determination of triggering parameters for hand-off} - H04W 36/302: {due to low signal strength} - H04W 76/30: Connection release - H04W 36/1443: {between licensed networks} - H04W 36/36: by user or terminal equipment - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for switching between different RATs is provided. The method is executed by a mobile communications device camping on a first cell using a first Radio Access Technology (RAT). The method includes: determining, by a controller of the mobile communications device, a data transmission rate of the mobile communications device in the first cell; sending, by the controller, a first measurement report according to the determined data transmission rate, wherein the first measurement report is intended to trigger a handover procedure initiated by the first cell or to release a radio resource control (RRC) connection; and switching, by the controller, to camp on a second cell using a second RAT via the handover procedure or a local releasing procedure after the sending of the first measurement report. ## Claims ### Claim 1 A method, executed by a mobile communications device camping on a first cell using a first Radio Access Technology (RAT), the method comprising: determining, by a controller of the mobile communications device, a data transmission rate of the mobile communications device in the first cell; sending, by the controller, a first measurement report according to the determined data transmission rate, wherein the first measurement report is intended to trigger a handover procedure initiated by the first cell or to release a radio resource control (RRC) connection; and switching, by the controller, to camp on a second cell using a second RAT via the handover procedure or a local releasing procedure after the sending of the first measurement report; wherein when the first RAT is fifth generation (5G) New Radio (NR) and the second RAT is fourth generation (4G) Long Term Evolution (LTE), the sending of the first measurement report comprises sending the first measurement report in response to the determined data transmission rate being lower than a first threshold; wherein when the first RAT is 4G LTE and the second RAT is 5G NR, the sending of the first measurement report comprises sending the first measurement report in response to the determined data transmission rate being higher than a second threshold; and wherein the first threshold and the second threshold are not related to each other. ### Claim 2 (depends on 1) The method of claim 1, wherein the first measurement report comprises a parameter indicating that a signal quality between the mobile communications device and the first cell is too poor to maintain a connection between the mobile communications device and the first cell. ### Claim 3 (depends on 2) The method of claim 2, wherein the signal quality comprises a reference signal received power (RSRP) and a reference signal received quality (RSRQ). ### Claim 4 (depends on 1) The method of claim 1, wherein the first measurement report is sent when a measurement of the second cell is configured by the first cell. ### Claim 5 (depends on 4) The method of claim 4, further comprising: sending a second measurement report intended to trigger a measurement control procedure to measure the second cell when the measurement is not configured by the first cell. ### Claim 6 (depends on 4) The method of claim 4, further comprising: receiving a radio resource control (RRC) connection release message sent by the first cell when releasing the RRC connection. ### Claim 7 (depends on 1) The method of claim 1, wherein the local releasing procedure comprises releasing a connection between the mobile communications device and the first cell in response to the handover procedure not being triggered for a period of time after the sending of the first measurement report. ### Claim 8 (depends on 7) The method of claim 7, wherein the local releasing procedure further comprises obtaining information related to the second cell according to a public land mobile network (PLMN) list from the first cell. ### Claim 9 A mobile communications device, comprising: a wireless transceiver, configured to perform wireless transmission and reception utilizing a first Radio Access Technology (RAT); and a controller, coupled to the wireless transceiver, and configured to: determine a data transmission rate of the mobile communications device camping on a first cell; send a first measurement report according to the determined data transmission rate, wherein the first measurement report is intended to trigger a handover procedure initiated by the first cell or to release a radio resource control (RRC) connection; and switch to camp on a second cell using a second RAT via the handover procedure or a local releasing procedure after sending the first measurement report; wherein when the first RAT is fifth generation (5G) New Radio (NR) and the second RAT is fourth generation (4G) Long Term Evolution (LTE), the sending of the first measurement report comprises sending the first measurement report in response to the determined data transmission rate being lower than a first threshold; wherein when the first RAT is 4G LTE and the second RAT is 5G NR, the sending of the first measurement report comprises sending the first measurement report in response to the determined data transmission rate being higher than a second threshold; and wherein the first threshold and the second threshold are not related to each other. ### Claim 10 (depends on 9) The mobile communications device of claim 9, wherein the first measurement report comprises a parameter indicating that a signal quality between the mobile communications device and the first cell is too poor to maintain a connection between the mobile communications device and the first cell. ### Claim 11 (depends on 10) The mobile communications device of claim 10, wherein the signal quality comprises a reference signal received power (RSRP) and a reference signal received quality (RSRQ). ### Claim 12 (depends on 9) The mobile communications device of claim 9, wherein the first measurement report is sent when a measurement of the second cell is configured by the first cell. ### Claim 13 (depends on 12) The mobile communications device of claim 12, wherein the controller is further configured to: send a second measurement report intended to trigger a measurement control procedure to measure the second cell when the measurement is not configured by the first cell. ### Claim 14 (depends on 9) The mobile communications device of claim 9, wherein the controller is further configured to: receive a radio resource control (RRC) connection release message sent by the first cell when releasing the RRC connection. ### Claim 15 (depends on 9) The mobile communications device of claim 9, wherein the local releasing procedure comprises releasing a connection between the mobile communications device and the first cell in response to the handover procedure not being triggered for a period of time after the sending of the first measurement report. ### Claim 16 (depends on 15) The mobile communications device of claim 15, wherein the local releasing procedure further comprises obtaining information related to the second cell according to a public land mobile network (PLMN) list from the first cell.