# US 9,883,451 B2 · Detection techniques for high gain mobile devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,451 B2 - Document ID: US9883451B2 - Status: Granted - Kind: B2 - Application number: 14/847,781 - Filed: 2015-09-08 - Published: 2016-11-17 - Granted: 2018-01-30 - Earliest claimed: 2015-05-14 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ray Francis Gonsalves; Madhusudan Kinthada Venkata; Sunanda Mukundan; Arvind Vardarajan Santhanam - Web page: https://patentgrep.com/patent/US9883451B2 ## CPC - H04W 48/18: Selecting a network or a communication service - H04L 43/16: Threshold monitoring - H04W 8/24: Transfer of terminal data - H04W 36/30: by measured or perceived connection quality data - H04W 48/20: Selecting an access point - H04W 60/00: Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - 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 In various aspects, the disclosure provides for cell selection including determining a gain of an antenna associated with a user equipment (UE), adding an offset to a threshold to yield a power threshold, wherein the offset is based on the gain of the antenna, selecting a wireless network, obtaining a power measurement associated with a cell within the selected wireless network, and comparing the power measurement with the power threshold to yield a comparison. ## Claims ### Claim 1 A method of cell selection comprising: determining a gain of an antenna associated with a user equipment (UE); adding an offset to a threshold to yield a power threshold, wherein the offset is based on the gain of the antenna; selecting a wireless network; obtaining a power measurement associated with a cell within the selected wireless network; comparing the power measurement with the power threshold to yield a comparison; checking a list in a database for a Visitor public land mobile network (VPLMN); and triggering a search for one or more roaming public land mobile networks (PLMNs), if the VPLMN is not found on the list. ### Claim 2 (depends on 1) The method of claim 1, further comprising selecting the cell as the suitable cell, wherein the comparison indicates that the power measurement is greater than the power threshold. ### Claim 3 (depends on 2) The method of claim 2, further comprising: obtaining a network identifier of the selected wireless network; and obtaining a cell identifier of the suitable cell. ### Claim 4 (depends on 2) The method of claim 2, wherein the UE stores a plurality of network identifiers associated with its Home public land mobile network (HPLMN) and stores a plurality of cell identifiers associated with cells in its HPLMN in one or more databases. ### Claim 5 (depends on 4) The method of claim 4 further comprising sharing one or more of the stored plurality of network identifiers and the stored plurality of cell identifiers with another UE. ### Claim 6 (depends on 1) The method of claim 1, further comprising: obtaining a power measurement associated with a different cell within the selected wireless network; comparing the power measurement associated with the different cell with the power threshold to yield a different comparison; and determining if the different comparison indicates that the power measurement associated with the different cell is greater than the power threshold. ### Claim 7 (depends on 1) The method of claim 1, wherein the wireless network is a public land mobile network (PLMN), being either a Home public land mobile network (HPLMN) or a Visitor public land mobile network (VPLMN). ### Claim 8 (depends on 7) The method of claim 7, wherein the UE is in a border area and approaching the VPLMN. ### Claim 9 (depends on 1) The method of claim 1, further comprising checking if a number of random access channel (RACH) failures equals or exceeds a threshold failure number. ### Claim 10 (depends on 1) The method of claim 1, wherein the search for the one or more roaming PLMNs is triggered after expiration of a VPLMN scan prohibit timer. ### Claim 11 (depends on 1) The method of claim 1, further comprising camping the UE on a Home public land mobile network (HPLMN) and removing the offset that was added to the threshold to yield the power threshold. ### Claim 12 (depends on 1) The method of claim 1, further comprising determining that the UE is in a weak coverage area with no available roaming PLMNs, and removing the offset that was added to the threshold to yield the power threshold. ### Claim 13 (depends on 1) The method of claim 1, further comprising checking if the VPLMN is an operator preferred PLMNs stored in a subscriber identity module (SIM) card of the UE, if the VPLMN is found on the list. ### Claim 14 (depends on 1) The method of claim 1, wherein the selecting the wireless network includes initiating a voice call or a data call using a Radio Resource Control (RRC) connection setup. ### Claim 15 (depends on 1) The method of claim 1, further comprising maintaining a border public land mobile network (PLMN) database with at least one network parameter, wherein the network parameter is one of: a Home public land mobile network (HPLMN) identifiers, a Home public land mobile network (HPLMN) cell identifiers, a Visitor public land mobile network (VPLMN) identifiers, or a Visitor public land mobile network (VPLMN) cell identifiers; and wherein the selecting the wireless network is based on the border PLMN database. ### Claim 16 An apparatus of cell selection comprising: a processor for determining a gain of an antenna associated with a user equipment (UE) and for selecting a wireless network; a receiver coupled to the processor for adding an offset to a threshold to yield a power threshold, wherein the offset is based on the gain of the antenna; and a power detector coupled to the receiver for obtaining a power measurement associated with a cell within the selected wireless network; and for comparing the power measurement with the power threshold to yield a comparison; and wherein the processor is further configured for checking a list in a database for a Visitor public land mobile network (VPLMN) and for triggering a search for one or more roaming public land mobile networks (PLMNs), if the VPLMN is not found on the list. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the processor is further configured for selecting the cell as the suitable cell, wherein the comparison indicates that the power measurement is greater than the power threshold. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the processor is further configured for obtaining a network identifier of the selected wireless network and for obtaining a cell identifier of the suitable cell. ### Claim 19 (depends on 17) The apparatus of claim 17, further comprising a memory coupled to the processor for storing a plurality of network identifiers associated with the UE's Home public land mobile network (HPLMN) and a plurality of cell identifiers associated with cells in the UE's HPLMN. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the search for the one or more roaming PLMNs is triggered after expiration of a VPLMN scan prohibit timer. ### Claim 21 An apparatus of cell selection comprising: means for determining a gain of an antenna associated with a user equipment (UE); means for adding an offset to a threshold to yield a power threshold, wherein the offset is based on the gain of the antenna; means for selecting a wireless network; means for obtaining a power measurement associated with a cell within the selected wireless network; means for comparing the power measurement with the power threshold to yield a comparison; means for checking a list in a database for a Visitor public land mobile network (VPLMN); and means for triggering a search for one or more roaming public land mobile networks (PLMNs), if the VPLMN is not found on the list. ### Claim 22 (depends on 21) The apparatus of claim 21, further comprising means for selecting the cell as the suitable cell, wherein the comparison indicates that the power measurement is greater than the power threshold. ### Claim 23 (depends on 22) The apparatus of claim 22, further comprising: means for obtaining a network identifier of the selected wireless network; and means for obtaining a cell identifier of the suitable cell. ### Claim 24 (depends on 22) The apparatus of claim 22, further comprising means for storing a plurality of network identifiers associated with the UE's Home public land mobile network (HPLMN) and a plurality of cell identifiers associated with cells in the UE's HPLMN. ### Claim 25 (depends on 21) The apparatus of claim 21, wherein the search for the one or more roaming PLMNs is triggered after expiration of a VPLMN scan prohibit timer. ### Claim 26 A non-transitory computer-readable storage medium storing computer executable code, operable on a device comprising at least one processor; a memory for storing one or more of a network identifier or a cell identifier, the memory coupled to the at least one processor; and the computer executable code comprising: instructions for causing the at least one processor to determine a gain of an antenna associated with a user equipment (UE); instructions for causing the at least one processor to add an offset to a threshold to yield a power threshold, wherein the offset is based on the gain of the antenna; instructions for causing the at least one processor to select a wireless network; instructions for causing the at least one processor to obtain a power measurement associated with a cell within the selected wireless network; instructions for causing the at least one processor to compare the power measurement with the power threshold to yield a comparison; and instructions for causing the at least one processor to check a list in a database for a Visitor public land mobile network (VPLMN); and instructions for causing the at least one processor to trigger a search for one or more roaming public land mobile networks (PLMNs), if the VPLMN is not found on the list. ### Claim 27 (depends on 26) The non-transitory computer-readable storage medium of claim 26, wherein the computer executable code further comprising: instructions for causing the at least one processor to select the cell as the suitable cell, wherein the comparison indicates that the power measurement is greater than the power threshold; and instructions for causing the at least one processor to obtain one or more of the network identifier or the cell identifier, wherein the network identifier is of the selected wireless network and the cell identifier is of the suitable cell. ### Claim 28 (depends on 26) The non-transitory computer-readable storage medium of claim 26, wherein the search for the one or more roaming PLMNs is triggered after expiration of a VPLMN scan prohibit timer.