# US 8,543,111 B2 · Control of cell search procedure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,111 B2 - Document ID: US8543111B2 - Status: Granted - Kind: B2 - Application number: 13/083,905 - Filed: 2011-04-11 - Published: 2012-10-11 - Granted: 2013-09-24 - Earliest claimed: 2011-04-11 - Assignees: Renesas Mobile Corporation - Applicants: Lauri Ilmari Harju; Kaj Tapio Jansen - Inventors: Lauri Ilmari Harju; Kaj Tapio Jansen - Web page: https://patentgrep.com/patent/US8543111B2 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04W 4/027: {using movement velocity, acceleration information} - H04W 36/0088: {Scheduling hand-off measurements} - H04W 52/0274: {by switching on or off the equipment or parts thereof} - H04W 36/326: {by proximity to another entity} - Y02D 30/70: in wireless communication networks - 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 A method, an apparatus and a computer program product for controlling cell search procedure, including a user equipment determining a change of position in relation to a serving cell; determining the quality of signal received from the serving cell; and stopping the cell search procedure if the change of position is smaller than a first value and the loss of signal quality is lower than a second value. ## Claims ### Claim 1 A method for controlling cell search procedure by an apparatus for wireless communication, the method comprising: determining a change of position in relation to a serving cell; determining quality of a signal received from the serving cell; and causing the cell search procedure to stop if the change of position is smaller than a first value and the determined quality is lower than a second value. ### Claim 2 (depends on 1) The method according to claim 1, wherein the change of position is determined from a value change of serving cell received signal code power (RSCP). ### Claim 3 (depends on 2) The method according to claim 2, wherein the value change in serving cell RSCP is determined by comparing a RSCP value measured during a current cell search procedure to a RSCP value measured during a latest cell search procedure. ### Claim 4 (depends on 1) The method according to claim 1, wherein determining the quality comprises determining pilot chip energy to interference power spectral density (Ec/Io) of a signal received a common pilot channel (CPICH). ### Claim 5 (depends on 1) The method according to claim 1, wherein the cell search procedure is caused to stop when new cells have not been found in a predefined number of consecutive searches. ### Claim 6 (depends on 1) The method according to claim 1, the method further comprising completing the cell search procedure after a predefined number of stopped cell search procedures. ### Claim 7 (depends on 1) The method according to claim 1, wherein the apparatus for wireless communication is configured to operate as part of a user equipment. ### Claim 8 An apparatus for wireless communication, comprising at least one processor and a memory storing computer instructions executable by the at least one processor, wherein the memory with the computer instructions and the processor are configured to cause the apparatus to at least: determine a change of position in relation to a serving cell; determine quality of a signal received from the serving cell; and cause a cell search procedure to stop if the change of position is smaller than a first value and the determined quality is lower than a second value. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the memory with the computer instructions and the processor are configured to cause the apparatus to determine the change of position from a value change of serving cell received signal code power (RSCP). ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein the value change in serving cell RSCP is determined by comparing a RSCP value measured during a current cell search procedure to a RSCP value measured during a latest cell search procedure. ### Claim 11 (depends on 8) The apparatus according to claim 8, wherein the determined quality of the signal comprises pilot chip energy to interference power spectral density (Ec/Io) of the signal received from a common pilot channel (CPICH). ### Claim 12 (depends on 8) The apparatus according to claim 8, wherein the cell search procedure is caused to stop when new cells have not been found in a predefined number of consecutive searches. ### Claim 13 (depends on 8) The apparatus according to claim 8, wherein the memory with the computer instructions and the processor are configured to cause the apparatus to complete the cell search procedure after a predefined number of stopped cell search procedures. ### Claim 14 (depends on 8) The apparatus according to claim 8, wherein the apparatus is configured to operate as part of a user equipment. ### Claim 15 A computer-readable memory tangibly storing computer program code embodied therein which is executable by a computer, the computer program code comprising: code for determining a change of position in relation to a serving cell; code for determining quality of a signal received from the serving cell; and code for causing a cell search procedure to stop if the change of position is smaller than a first value and the determined quality is lower than a second value. ### Claim 16 (depends on 15) The computer-readable memory according to claim 15, wherein the change of position is determined from a change in value of serving cell received signal code power (RSCP).RSCP value change. ### Claim 17 (depends on 16) The computer-readable memory according to claim 16, wherein the change in value of serving cell RSCP is determined by comparing a RSCP value measured during a current cell search procedure to a RSCP value measured during a latest cell search procedure. ### Claim 18 (depends on 15) The computer-readable memory according to claim 15, wherein determining the quality comprises determining pilot chip energy to interference power spectral density (Ec/Io) of a signal received from a common pilot channel (CPICH). ### Claim 19 (depends on 15) The computer-readable memory according to claim 15, wherein the cell search procedure is caused to stop when new cells have not been found in a predefined number of consecutive searches. ### Claim 20 (depends on 15) The computer-readable memory according to claim 15, further comprising code for completing the cell search procedure after a predefined number of stopped cell search procedures.