# US 10,375,711 B2 · Methods for LTE channel selection in unlicensed bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,711 B2 - Document ID: US10375711B2 - Status: Granted - Kind: B2 - Application number: 14/078,508 - Filed: 2013-11-12 - Published: 2015-05-14 - Granted: 2019-08-06 - Earliest claimed: 2013-11-12 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ahmed Kamel Sadek; Mehmet Yavuz; Tamer Adel Kadous - Web page: https://patentgrep.com/patent/US10375711B2 ## CPC - H04W 72/1215: {for collaboration of different radio technologies} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 24/02: Arrangements for optimising operational condition - H04W 72/542: using measured or perceived quality - H04W 84/045: {using private Base Stations, e.g. femto Base Stations, home Node B} - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Described herein are techniques for reducing interference to non-cellular communications on an unlicensed band by a network entity sending/receiving cellular communications on the unlicensed band. For example, the technique may involve operating in a first mode using a first radio access technology (RAT1), and collecting interference measurements for interference to or from at least one mobile device while in the first mode. The technique may also involve switching to a second mode and using a second radio access technology (RAT2), and using the interference measurements from the first mode to minimize interference caused or experienced by the network entity in the second mode. ## Claims ### Claim 1 A method operable by a network entity configured for wireless communication, the method comprising: operating in a first mode using a first radio access technology (RAT1), wherein operating in the first mode comprises communicating on an unlicensed band; collecting interference measurements for interference to or from at least one mobile device while in the first mode; building a database from the collected interference measurements, the database comprising information regarding interference levels experienced by the network entity for LTE communication on channels of the unlicensed band, wherein collecting the interference measurements comprises directly making the interference measurements; switching to a second mode and using a second radio access technology (RAT2); and using the interference measurements from the first mode to reduce interference caused or experienced by the network entity in the second mode by selecting a channel in the unlicensed band for communication from a prioritized list of channels, wherein each channel in the prioritized list of channels is checked in order of priority and a first channel from the prioritized list of channels that satisfies an interference criteria based on a received signal strength indicator (RSSI) metric and a duty cycle metric being less than a threshold is selected. ### Claim 2 (depends on 1) The method of claim 1, wherein collecting the interference measurements in the first mode comprises using Wi-Fi over 802.11k. ### Claim 3 (depends on 1) The method of claim 1, wherein collecting the interference measurements in the first mode comprises using Long Term Evolution (LTE) by modifying Reference Signal Received Power (RSRP)/Reference Signal Received Quality (RSRQ). ### Claim 4 (depends on 1) The method of claim 1, wherein: operating in the first mode comprises communicating via Wi-Fi on the unlicensed band; and operating in the second mode comprises communicating with one or more of the mobile devices on the unlicensed channel via LTE. ### Claim 5 (depends on 1) The method of claim 1, wherein collecting the interference measurements comprises receiving the interference measurements from one or more of the mobile devices. ### Claim 6 (depends on 1) The method of claim 1, wherein the interference measurements are based at least in part on the RSSI. ### Claim 7 (depends on 1) The method of claim 1, wherein the network entity comprises a small base station that includes a neighborhood small cell (NSC) co-located with a Wi-Fi access point. ### Claim 8 (depends on 1) The method of claim 1, wherein the network entity is configured to (a) operate in a standalone unlicensed band or (b) operate in both a licensed band and the unlicensed band in a carrier aggregation mode. ### Claim 9 An apparatus, comprising: means for operating in a first mode using a first radio access technology (RAT1), wherein operating in the first mode comprises communicating on an unlicensed band; means for collecting interference measurements for interference to or from at least one mobile device while in the first mode; means for building a database from the collected interference measurements, the database comprising information regarding interference levels experienced by the network entity for LTE communication on channels of the unlicensed band, wherein collecting the interference measurements comprises directly making the interference measurements; means for switching to a second mode and using a second radio access technology (RAT2); and means for using the interference measurements from the first mode to reduce interference caused or experienced by the network entity in the second mode by selecting a channel in the unlicensed band for communication from a prioritized list of channels, wherein each channel in the prioritized list of channels is checked in order of priority and a first channel from the prioritized list of channels that satisfies an interference criteria based on a received signal strength indicator (RSSI) metric and a duty cycle metric being less than a threshold is selected. ### Claim 10 (depends on 9) The apparatus of claim 9, further comprising means for modifying Reference Signal Received Power (RSRP)/Reference Signal Received Quality (RSRQ). ### Claim 11 An apparatus, comprising: at least one radio frequency (RF) transceiver; at least one processor coupled to the at least one RF transceiver and configured to: operate in a first mode using a first radio access technology (RAT1), wherein operating in the first mode comprises communicating on an unlicensed band; collect interference measurements for interference to or from at least one mobile device while in the first mode; build a database from the collected interference measurements, the database comprising information regarding interference levels experienced by the network entity for Wi-Fi communication on channels of the unlicensed band, wherein collecting the interference measurements comprises directly making the interference measurements; switch to a second mode and using a second radio access technology (RAT2); and use the interference measurements from the first mode to reduce interference caused or experienced by the network entity in the second mode by selecting a channel in the unlicensed band for communication from a prioritized list of channels, wherein each channel in the prioritized list of channels is checked in order of priority and a first channel from the prioritized list of channels that satisfies an interference criteria based on a received signal strength indicator (RSSI) metric and a duty cycle metric being less than a threshold is selected; and a memory coupled to the at least one processor for storing data. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the at least one processor is further configured to modify Reference Signal Received Power (RSRP)/Reference Signal Received Quality (RSRQ). ### Claim 13 A non-transitory computer-readable medium comprising code for causing a computer to: operate in a first mode using a first radio access technology (RAT1), wherein operating in the first mode comprises communicating on an unlicensed band; collect interference measurements for interference to or from at least one mobile device while in the first mode; build a database from the collected interference measurements, the database comprising information regarding interference levels experienced by the network entity for Wi-Fi communication on channels of the unlicensed band, wherein collecting the interference measurements comprises directly making the interference measurements; switch to a second mode and using a second radio access technology (RAT2); and use the interference measurements from the first mode to reduce interference caused or experienced by the network entity in the second mode by selecting a channel in the unlicensed band for communication from a prioritized list of channels, wherein each channel in the prioritized list of channels is checked in order of priority and a first channel from the prioritized list of channels that satisfies an interference criteria based on a received signal strength indicator (RSSI) metric and a duty cycle metric being less than a threshold is selected. ### Claim 14 (depends on 13) The non-transitory computer-readable medium of claim 13, further comprising code for causing the computer to modify Reference Signal Received Power (RSRP)/Reference Signal Received Quality (RSRQ).