# US 12,015,955 B2 · Device, system, and method for switching between a narrowband network and a broadband network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,955 B2 - Document ID: US12015955B2 - Status: Granted - Kind: B2 - Application number: 17/555,872 - Filed: 2021-12-20 - Published: 2023-06-22 - Granted: 2024-06-18 - Earliest claimed: 2021-12-20 - Assignees: Motorola Solutions, Inc. - Applicants: Motorola Solutions, Inc. - Inventors: Badarinath Patibandla; Daniel P. Zetzl; David J. Ley; Mohd Faisal Abdullah - Web page: https://patentgrep.com/patent/US12015955B2 ## CPC - H04W 36/0022: {for transferring data sessions between adjacent core network technologies} - H04W 36/22: for handling the traffic - H04W 36/14: Reselecting a network or an air interface - H04W 36/24: Reselection being triggered by specific parameters - H04W 36/1446: {wherein at least one of the networks is unlicensed} - H04W 48/06: based on traffic conditions - 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 device, system, and method for switching between a narrowband network and a broadband network is provided. A radio device determines conditions of a broadband network and receives, from a narrowband network site, access criteria indicating that a subset of a plurality of radio devices can register with the narrowband network site to communicate on a narrowband network. In response to the conditions meeting one or more given conditions and receiving the access criteria, when the radio device is communicating on the broadband network, the radio device may continue communicating on the broadband network; or when the radio device is communicating on the narrowband network, or attempting to register with the narrowband network site, the radio device switches, from communicating on the narrowband network, or attempting to register with the narrowband network site, to communicating on the broadband network. ## Claims ### Claim 1 A method comprising: determining, at a radio device, one or more conditions of a broadband network; receiving, at the radio device, from a narrowband network site of a narrowband network, access criteria indicating that a subset of a plurality of radio devices can register with the narrowband network site to communicate on the narrowband network; and in response to the one or more conditions of the broadband network meeting one or more given conditions and receiving the access criteria: when the radio device is communicating on the broadband network, continuing, at the radio device, communicating on the broadband network; and when the radio device is communicating on the narrowband network, or attempting to register with the narrowband network site, switching, at the radio device, from communicating on the narrowband network, or attempting to register with the narrowband network site, to communicating on the broadband network. ### Claim 2 (depends on 1) The method of claim 1, further comprising: switching, at the radio device, from communicating on the narrowband network, or attempting to register with the narrowband network site, to communicating on the broadband network, further in response to the one or more conditions of the broadband network meeting the one or more given conditions and one or more of: being denied registration at the narrowband network site; determining that the narrowband network site is busy; determining a talkgroup affiliation failure on the narrowband network; losing communication with a control channel on the narrowband network; determining that the control channel comprises a shared control channel; and determining that there is no active connection on the narrowband network. ### Claim 3 (depends on 1) The method of claim 1, further comprising: communicating, at the radio device, on the broadband network; determining, at the radio device, one or more respective conditions of the narrowband network; and switching, at the radio device, from communicating on the broadband network to communicating on the narrowband network in response to the one or more respective conditions of the narrowband network meeting one or more respective given conditions and one or more of: determining that the broadband network goes down; determining that there is no active connection with the broadband network; determining that there is no connection to the Internet on the broadband network; losing a connection with a call server on the broadband network, the call server to coordinate one or more of calls and messages between the broadband network and the narrowband network; determining that the call server is unavailable; determining that the radio device is logged out of the call server; and determining that a gateway between the broadband network and the narrowband network is unavailable. ### Claim 4 (depends on 1) The method of claim 1, wherein the narrowband network comprises one or more of a digital mobile radio network and a land mobile radio network. ### Claim 5 (depends on 1) The method of claim 1, wherein the broadband network comprises one or more of a cell phone network, an LTE (Long Term Evolution) network, a 5G network, and a WiFi network. ### Claim 6 (depends on 1) The method of claim 1, wherein: the one or more conditions of the broadband network comprising one or more of a signal strength of the broadband network, a signal quality of the broadband network, a Reference Signal Received Power (RSRP) of the broadband network, a Received Signal Strength Indicator (RSSI) of the broadband network, a Reference Signal Received Quality (RSRQ) of the broadband network, an identifier of one or more of the broadband network and a broadband network site, and the one or more given conditions respectively comprise one or more of: the signal strength of the broadband network being above a given signal strength threshold; the signal quality of the broadband network being above a given signal quality threshold; the RSRP of the broadband network being above a given RSRP threshold; the RSSI of the broadband network being above a given RSSI threshold; the RSRQ of the broadband network being above a given RSRQ threshold; the identifier being on an approved list; and the identifier not being on a denied list. ### Claim 7 (depends on 1) The method of claim 1, further comprising switching, at the radio device, from communicating on the narrowband network to communicating on the broadband network after a given dwell time during which the radio device was communicating on the narrowband network. ### Claim 8 (depends on 1) The method of claim 1, wherein the access criteria comprises an indication of identifiers of the subset of the plurality of radio devices can register with the narrowband network site to communicate on the narrowband network. ### Claim 9 (depends on 1) The method of claim 1, further comprising: communicating, at the radio device, on the broadband network; determining, at the radio device, that a signal strength of the narrowband network is above a given signal strength threshold; receiving, at the radio device, from the narrowband network site, the access criteria; and switching, at the radio device, from communicating on the broadband network to communicating on the narrowband network when further access criteria is received from the narrowband network site indicating that all the radio devices can register on the narrowband network, and not just the subset. ### Claim 10 (depends on 1) The method of claim 1, wherein the subset includes the radio device or the subset excludes the radio device. ### Claim 11 A radio device comprising: a communication unit configured to communicate over a narrowband network and a broadband network; and a controller configured to: determine one or more conditions of the broadband network; receive, via the communication unit, from a narrowband network site of the narrowband network, access criteria indicating that a subset of a plurality of radio devices can register with the narrowband network site to communicate on the narrowband network; and in response to the one or more conditions of the broadband network meeting one or more given conditions and receiving the access criteria: when the radio device is communicating on the broadband network, continue communicating on the broadband network via the communication unit; and when the radio device is communicating on the narrowband network, or attempting to register with the narrowband network site, switch from communicating on the narrowband network, or attempting to register with the narrowband network site, to communicating on the broadband network via the communication unit. ### Claim 12 (depends on 11) The radio device of claim 11, wherein the controller is further configured to: switch from communicating on the narrowband network, or attempting to register with the narrowband network site, to communicating on the broadband network, further in response to the one or more conditions of the broadband network meeting the one or more given conditions and one or more of: being denied registration at the narrowband network site; determining that the narrowband network site is busy; determining a talkgroup affiliation failure on the narrowband network; losing communication with a control channel on the narrowband network; determining that the control channel comprises a shared control channel; and determining that there is no active connection on the narrowband network. ### Claim 13 (depends on 11) The radio device of claim 11, wherein the controller is further configured to: communicate, at the radio device, on the broadband network; determine one or more respective conditions of the narrowband network; and switch from communicating on the broadband network to communicating on the narrowband network in response to the one or more respective conditions of the narrowband network meeting one or more respective given conditions and one or more of: determining that the broadband network goes down; determining that there is no active connection with the broadband network; determining that there is no connection to the Internet on the broadband network; losing a connection with a call server on the broadband network, the call server to coordinate one or more of calls and messages between the broadband network and the narrowband network; determining that the call server is unavailable; determining that the radio device is logged out of the call server; and determining that a gateway between the broadband network and the narrowband network is unavailable. ### Claim 14 (depends on 11) The radio device of claim 11, wherein the narrowband network comprises one or more of a digital mobile radio network and a land mobile radio network. ### Claim 15 (depends on 11) The radio device of claim 11, wherein the broadband network comprises one or more of a cell phone network, an LTE (Long Term Evolution) network, a 5G network, and a WiFi network. ### Claim 16 (depends on 11) The radio device of claim 11, wherein: the one or more conditions of the broadband network comprise one or more of a signal strength of the broadband network, a signal quality of the broadband network, a Reference Signal Received Power (RSRP) of the broadband network, a Received Signal Strength Indicator (RSSI) of the broadband network, a Reference Signal Received Quality (RSRQ) of the broadband network, an identifier of one or more of the broadband network and a broadband network site, and the one or more given conditions respectively comprise one or more of: the signal strength of the broadband network being above a given signal strength threshold; the signal quality of the broadband network being above a given signal quality threshold; the RSRP of the broadband network being above a given RSRP threshold; the RSSI of the broadband network being above a given RSSI threshold; the RSRQ of the broadband network being above a given RSRQ threshold; the identifier being on an approved list; and the identifier not being on a denied list. ### Claim 17 (depends on 11) The radio device of claim 11, wherein the controller is further configured to switch from communicating on the narrowband network to communicating on the broadband network after a given dwell time during which the radio device was communicating on the narrowband network. ### Claim 18 (depends on 11) The radio device of claim 11, wherein the access criteria comprises an indication of identifiers of the subset of the plurality of radio devices can register with the narrowband network site to communicate on the narrowband network. ### Claim 19 (depends on 11) The radio device of claim 11, wherein the controller is further configured to: communicate on the broadband network; determine that a signal strength of the narrowband network is above a given signal strength threshold; receive, from the narrowband network site, the access criteria; and switch from communicating on the broadband network to communicating on the narrowband network when further access criteria is received from the narrowband network site indicating that all the radio devices can register on the narrowband network, and not just the subset. ### Claim 20 (depends on 11) The radio device of claim 11, wherein the subset includes the radio device or the subset excludes the radio device.