# US 2018/0324683 A1 · Apapratus and method for adaptive discovery signal measurement timing configuration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324683 A1 - Document ID: US20180324683A1 - Status: Published application - Kind: A1 - Application number: 15/769,827 - Filed: 2016-08-18 - Published: 2018-11-08 - Earliest claimed: 2015-10-23 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Emma Wittenmark; Peter Alriksson; David Sugirtharaj - Web page: https://patentgrep.com/patent/US20180324683A1 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04J 11/0093: {Neighbour cell search} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/00: Modulated-carrier systems - H04W 56/001: {Synchronization between nodes} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Disclosed herein is a method implemented in a network node configured to operate in a wireless network for adjusting the length of a search window, in which a wireless communication device is required to search for signals from other network nodes. The method comprises the steps of determining a degree of synchronization of the network, estimating an expected delay to acquire a channel within the network, determining a search window length and informing the wireless communication device of the determined search window length. Also disclosed herein is an arrangement of a network node and a computer program product. ## Claims ### Claim 1 A method implemented in a network node configured to operate in a wireless network for adjusting the length of a search window, in which a wireless communication device is required to search for signals from other network nodes, comprising the steps of: determining a degree of synchronization of the network; estimating an expected delay to acquire a channel within the network; determining a search window length; and informing the wireless communication device of the determined search window length. ### Claim 2 (depends on 1) The method according to claim 1, wherein determining the degree of synchronization of the network is based on which synchronization method the network uses. ### Claim 3 (depends on 1) The method according to claim 1, wherein determining the degree of synchronization of the network is based on measurements of the degree of synchronization using signals from other network nodes. ### Claim 4 (depends on 1) The method according to claim 1, wherein determining the degree of synchronization of the network is based on measurements performed by the wireless communication device of relative timing between nodes. ### Claim 5 (depends on 1) The method according to claim 1, wherein estimating the expected delay to acquire the channel is based on historical clear channel assessment success rate. ### Claim 6 (depends on 1) The method according to claim 1, wherein estimating the expected delay to acquire the channel is based on a measured interference level. ### Claim 7 (depends on 1) The method according to claim 1, wherein estimating the expected delay to acquire the channel is based on measured channel occupancy of other nodes. ### Claim 8 (depends on 1) The method according to claim 1, wherein determining the search window length is made taking the degree of synchronization into account. ### Claim 9 (depends on 1) The method according to claim 1, wherein determining the search window length is made taking the expected delay to acquire the channel into account. ### Claim 10 (depends on 1) The method according to claim 1, wherein determining the search window length is made taking a target success rate for transmission of control signals in the search window into account. ### Claim 11 (depends on 1) The method according to claim 1, wherein the wireless communication device is in RRC connected state and is notified about a change of the search window length, and wherein informing the wireless communication device of the search window length is done using dedicated signaling. ### Claim 12 (depends on 1) The method according to claim 1, the wireless communication device is in RRC IDLE state and is notified about a change of the search window length, wherein a system information is updated with the determined search window length and wherein informing the wireless device of the search window length is done using broadcast signaling to reread the system information. ### Claim 13 (depends on 1) The method according to claim 1, wherein the search window is a long term evolution (LTE) discovery signal measurement timing configuration (DMTC) window. ### Claim 14 (depends on 10) The method according to claim 10, wherein the control signals is a discovery reference signal (DRS). ### Claim 15 An arrangement of a network node configured to adjust the length of a search window, in which a wireless communication device is required to search for signals from other network nodes, wherein the arrangement comprises a controller configured to: determining a degree of synchronization of the network; estimating an expected delay to acquire a channel within the network; determining a search window length; and informing the wireless communication device of the determined search window length. ### Claim 16 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause determination of the degree of synchronization of the network based on which synchronization method the network uses. ### Claim 17 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause determination of the degree of synchronization of the network based on measurements of the degree of synchronization using signals from other network nodes. ### Claim 18 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause determination of the degree of synchronization of the network based on measurements performed by the wireless communication device of relative timing between nodes. ### Claim 19 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause estimation of the expected delay to acquire the channel based on historical clear channel assessment success rate. ### Claim 20 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause estimation of expected delay to acquire the channel based on a measured interference level. ### Claim 21 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause estimation of expected delay to acquire the channel based on measured channel occupancy of other nodes. ### Claim 22 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause determination of the search window length by taking the degree of synchronization into account. ### Claim 23 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause determination of the search window length by taking the expected delay to acquire the channel into account. ### Claim 24 (depends on 15) The arrangement according to claim 15, wherein the controller is further configured to cause determination of the search window length by taking a target success rate for transmission of control signals in the search window into account. ### Claim 25 (depends on 15) The arrangement according to claim 15, wherein the wireless communication device is in radio resource control—RRC-Connected state and is notified about a change of the search window length, and wherein the controller is further configured to cause the information of the wireless communication device of the search window length by using dedicated signaling. ### Claim 26 (depends on 15) The arrangement according to claim 15, wherein the wireless communication device is in radio resource control—RRC-IDLE state and is notified about a change of the search window length, wherein the controller is configured to update a system information with the determined search window length, and wherein the controller is further configured to cause the information of wireless communication device of the search window length by paging the wireless communication device using broadcast signaling to reread the system information. ### Claim 27 (depends on 15) The arrangement according to claim 15, wherein the search window is a long term evolution (LTE) discovery signal measurement timing configuration (DMTC) window. ### Claim 28 (depends on 24) The arrangement according to claim 24, wherein the control signal is a discovery reference signal (DRS). ### Claim 29 (depends on 15) A network node comprising the arrangement according to claim 15. ### Claim 30 A non-transitory computer readable medium having stored thereon a computer program comprising program instructions that, when run by a data-processing unit, cause the data-processing unit to execute a method in a network node configured to operate in a wireless network for adjusting the length of a search window, in which a wireless communication device is required to search for signals from other network nodes, the method comprising: determining a degree of synchronization of the network; estimating an expected delay to acquire a channel within the network; determining a search window length; and informing the wireless communication device of the determined search window length.