# US 9,438,406 B1 · Methods and systems for implementing an inter-frequency measurement procedure in the presence of a closed access node > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,406 B1 - Document ID: US9438406B1 - Status: Granted - Kind: B1 - Application number: 14/481,150 - Filed: 2014-09-09 - Granted: 2016-09-06 - Earliest claimed: 2014-09-09 - Assignees: Sprint Spectrum L.P. - Applicants: Sprint Spectrum LP - Inventors: Daniel Vivanco - Web page: https://patentgrep.com/patent/US9438406B1 ## CPC - H04L 5/0069: {Allocation based on distance or geographical location} - H04W 4/023: {using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 28/0236: {radio quality, e.g. interference, losses or delay} - H04W 40/12: based on transmission quality or channel quality - H04W 40/16: based on interference - H04L 25/03821: {Inter-carrier interference cancellation [ICI]} - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 72/542: using measured or perceived quality - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Systems and methods are described for implementing an inter-frequency measurement procedure in a wireless communication network. A group of wireless devices are selected based on a selection criteria. A first parameter value associated with a first access node is received from the selected group of wireless devices at the first access node. Proximity of a second access node to the first access node is estimated based on the received first parameter value. A second parameter value that is similar to the first parameter value and associated with the first access node is received from a non-selected wireless device. Quality indicators for the non-selected wireless device are monitored at the first access node. A relationship between the received first parameter value and the quality indicators for the non-selected wireless device is determined. An inter-frequency measurement procedure based on the determined relationship is initiated. ## Claims ### Claim 1 A method for implementing an inter-frequency measurement procedure, the method comprising: selecting a group of wireless devices based on a selection criteria and receiving from the selected group of wireless devices a first parameter value associated with a first access node; estimating proximity of a second access node to the first access node based on the received first parameter value; receiving from a non-selected wireless device a second parameter value associated with the first access node that is within a level of the first parameter value and monitoring quality indicators for the non-selected wireless device; determining a relationship between the received first parameter value and the quality indicators; and initiating an inter-frequency measurement procedure based on the determined relationship. ### Claim 2 (depends on 1) The method of claim 1, wherein the selection criteria is a valid subscription to the second access node. ### Claim 3 (depends on 1) The method of claim 1, wherein the first access node configures the selected group of wireless devices with closed access mode proximity detection as a measurement type. ### Claim 4 (depends on 1) The method of claim 1, wherein the first parameter value is measurement and reporting information of the first access node and the second access node. ### Claim 5 (depends on 4) The method of claim 4, wherein the measurement and reporting information includes whether the selected group of wireless devices are entering or leaving a corresponding frequency associated with the first access node and/or second access node. ### Claim 6 (depends on 1) The method of claim 1, wherein a cell global identity and a signal power level of the first access node is stored at the source access node. ### Claim 7 (depends on 6) The method of claim 6, wherein a cell global identity and a signal power level of the second access node is stored at the source access node. ### Claim 8 (depends on 7) The method of claim 7, the second parameter value is a signal power level of a current frequency of the non-selected wireless device. ### Claim 9 (depends on 8) The method of claim 8, wherein a fine-tuning factor is applied to determined relationship. ### Claim 10 (depends on 1) The method of claim 1, wherein the second access node is deployed within a coverage area of the first access node. ### Claim 11 A system for implementing an inter-frequency measurement procedure, the system comprising: a first access node and a controller, the controller configured to: select a group of wireless devices based on a selection criteria and received from the selected group of wireless devices a first parameter value associated with a first access node; estimate proximity of a second access node to the first access node based on the received first parameter value; receive from a non-selected wireless device a second parameter value associated with the first access node that is within a level of the first parameter value and monitor quality indicators for the non-selected wireless device; determine a relationship between the received first parameter value and the quality indicators; and initiate an inter-frequency measurement procedure based on the determined relationship. ### Claim 12 (depends on 11) The system of claim 11, wherein the selection criteria is a valid subscription to the second access node. ### Claim 13 (depends on 11) The system of claim 11, wherein the controller node is configured to provide the group of selected wireless devices with closed access mode proximity detection as a measurement type. ### Claim 14 (depends on 11) The system of claim 11, wherein the non-selected wireless device does not have a valid subscription to the second access node. ### Claim 15 (depends on 13) The system of claim 13, wherein the controller node is configured to detect a location of the non-selected wireless device based on a reference signal received power and cell global identity of the first access node and the second access node reported by the group of selected wireless devices and received at the first access node. ### Claim 16 (depends on 13) The system of claim 13, wherein the source access node is notified when the group of selected wireless devices enters or leaves a corresponding frequency associated with the first access node and/or the second access node. ### Claim 17 (depends on 11) The system of claim 11, wherein the first parameter value is a signal power level of the source access node and target access node reported by the group of selected wireless devices. ### Claim 18 (depends on 17) The system of claim 17, wherein the second parameter value is a signal power level of a current frequency of the non-selected wireless device.