# US 10,455,522 B2 · SON accounting for max supported geographical distance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,522 B2 - Document ID: US10455522B2 - Status: Granted - Kind: B2 - Application number: 15/905,820 - Filed: 2018-02-26 - Published: 2018-08-30 - Granted: 2019-10-22 - Earliest claimed: 2017-02-24 - Assignees: Parallel Wireless, Inc. - Applicants: Parellel Wireless, Inc. - Inventors: Eric Mrozinski - Web page: https://patentgrep.com/patent/US10455522B2 ## CPC - H04W 52/283: {Power depending on the position of the mobile} - H04W 24/02: Arrangements for optimising operational condition - H04W 48/10: using broadcasted information - H04W 52/322: {Power control of broadcast channels} - H04W 64/006: {with additional information processing, e.g. for direction or speed determination} - H04W 60/04: using triggered events - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks - 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 is disclosed for determining an appropriate transmit power of a cell based on a desired coverage distance, comprising: initializing, at a cell, a cell reference signal transmit power at a high power level; broadcasting a cell signal power measure to require a high signal power level for user devices attempting to connect to the cell; progressively lowering the cell signal power measure at the cell; broadcasting the lowered cell signal power measure; deriving a plurality of user equipment (UE) attach request distances based on a plurality of propagation delay statistics derived from UE attach requests received at the cell; comparing the plurality of UE attach request distances against a maximum distance to obtain a number of UE attach requests received from UEs physically located beyond the maximum distance; and setting the cell reference signal transmit power based on the number of UE attach requests received from beyond the maximum distance, thereby iteratively determining an appropriate cell reference signal transmit power based on the maximum distance and on UE attach requests received at the cell. ## Claims ### Claim 1 A method for determining an appropriate transmit power of a cell based on a desired coverage distance, comprising: initializing, at the cell, a cell reference signal transmit power at a high power level; broadcasting a cell signal power measure to require a high signal power level for user devices attempting to connect to the cell; progressively lowering the cell signal power measure at the cell; broadcasting lowered cell signal power measure; deriving a plurality of user equipment (UE) attach request distances based on a plurality of propagation delay statistics derived from UE attach requests received at the cell; comparing the plurality of the UE attach request distances against a maximum distance to obtain a number of the UE attach requests received from UEs physically located beyond the maximum distance; and setting the cell reference signal transmit power based on the number of the UE attach requests received from beyond the maximum distance, thereby iteratively determining an appropriate cell reference signal transmit power based on the maximum distance and on the UE attach requests received at the cell. ### Claim 2 (depends on 1) The method of claim 1, further comprising setting the cell reference signal transmit power when a statistically significant number of UE attach requests is received from distances less than the maximum distance but not from distances greater than the maximum distance. ### Claim 3 (depends on 1) The method of claim 1, further comprising further lowering the cell signal power measure at the cell when a statistically significant number of UE attach requests is received from distances equal to or greater than the maximum distance, and collecting a further plurality of UE attach request propagation delay statistics. ### Claim 4 (depends on 1) The method of claim 1, further comprising analyzing the plurality of propagation delay statistics to obtain a statistically significant number of propagation delay statistics. ### Claim 5 (depends on 1) The method of claim 1, further comprising deriving the maximum distance from a maximum propagation delay of a UE request message based on a known timing of the UE request message relative to a reference signal broadcast by the cell. ### Claim 6 (depends on 1) The method of claim 1, wherein the cell is a Universal Mobile Telecommunications Service (UMTS) nodeB, the cell reference signal transmit power is a Common Pilot Channel (CPICH) transmit power, and the cell signal power measure is Qrxlevmin. ### Claim 7 (depends on 1) The method of claim 1, wherein the cell is a Long Term Evolution eNodeB, the cell reference signal transmit power is an LTE Reference Signal (RS), and the cell signal power measure is received signal reference power (RSRP) or received signal reference quality (RSRQ). ### Claim 8 (depends on 1) The method of claim 1, further comprising performing fine adjustment by stepping the value of the cell reference signal transmit power through a range of values. ### Claim 9 A non-transitory computer-readable medium comprising instructions which, when executed on a self-organizing network coordinating gateway, cause the gateway to perform: send a configuration message to initialize, at a cell, a cell reference signal transmit power at a high power level; cause the cell to broadcast a cell signal power measure to require a high signal power level for user devices attempting to connect to the cell; deriving a plurality of UE attach request distances based on a plurality of propagation delay statistics derived from UE attach requests received at the cell; comparing the plurality of the UE attach request distances against a maximum distance to obtain a number of the UE attach requests received from UEs physically located beyond the maximum distance; and cause the cell to set the cell reference signal transmit power based on the number of the UE attach requests received from beyond the maximum distance, thereby iteratively determining an appropriate cell reference signal transmit power based on the maximum distance and on the UE attach requests received at the cell. ### Claim 10 (depends on 9) The non-transitory computer-readable medium of claim 9, the instructions further comprising causing the cell to set the cell reference signal transmit power when a statistically significant number of UE attach requests is received from distances less than the maximum distance but not from distances greater than the maximum distance. ### Claim 11 (depends on 9) The non-transitory computer-readable medium of claim 9, the instructions further comprising further lowering the cell signal power measure at the cell when a statistically significant number of UE attach requests is received from distances equal to or greater than the maximum distance, and collecting a further plurality of UE attach request propagation delay statistics. ### Claim 12 (depends on 9) The non-transitory computer-readable medium of claim 9, the instructions further comprising analyzing the plurality of propagation delay statistics to obtain a statistically significant number of propagation delay statistics. ### Claim 13 (depends on 9) The non-transitory computer-readable medium of claim 9, the instructions further comprising deriving the maximum distance from a maximum propagation delay of a UE request message based on a known timing of the UE request message relative to a reference signal broadcast by the cell. ### Claim 14 (depends on 9) The non-transitory computer-readable medium of claim 9, wherein the cell is a Universal Mobile Telecommunications Service (UMTS) nodeB, the cell reference signal transmit power is a Common Pilot Channel (CPICH) transmit power, the cell signal power measure is Qrxlevmin, and the self-organizing network coordinating gateway is located in a UMTS core network or between the UMTS core network and the cell. ### Claim 15 (depends on 9) The non-transitory computer-readable medium of claim 9, wherein the cell is a Long Term Evolution eNodeB, the cell reference signal transmit power is an LTE Reference Signal (RS), the cell signal power measure is received signal reference power (RSRP) or received signal reference quality (RSRQ), and the self-organizing network coordinating gateway is located between an LTE core network and the cell. ### Claim 16 (depends on 9) The non-transitory computer-readable medium of claim 9, the instructions further comprising performing fine adjustment by stepping the value of the cell reference signal transmit power through a range of values. ### Claim 17 A non-transitory computer-readable medium comprising instructions which, when executed on a processor in a cellular base station, cause the cellular base station to perform: initializing a cell reference signal transmit power at a high power level; broadcasting a cell signal power measure to require a high signal power level for user devices attempting to connect to the cellular base station; progressively lowering the cell signal power measure at the cellular base station; broadcasting the lowered cell signal power measure; deriving a plurality of user equipment (UE) attach request distances based on a plurality of propagation delay statistics derived from UE attach requests received at the cellular base station; comparing the plurality of the UE attach request distances against a maximum distance to obtain a number of the UE attach requests received from UEs physically located beyond the maximum distance; and setting the cell reference signal transmit power based on the number of the UE attach requests received from beyond the maximum distance, thereby iteratively determining an appropriate cell reference signal transmit power based on the maximum distance and on the UE attach requests received at the cellular base station.