# US 2018/0324686 A1 · Frequency scan in nr wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324686 A1 - Document ID: US20180324686A1 - Status: Published application - Kind: A1 - Application number: 15/967,073 - Filed: 2018-04-30 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Navid ABEDINI; Sundar SUBRAMANIAN; Muhammad Nazmul ISLAM; Tao LUO; Bilal SADIQ; Hung LY; Heechoon LEE; Haitong SUN - Web page: https://patentgrep.com/patent/US20180324686A1 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04W 56/001: {Synchronization between nodes} - G06Q 10/40: Business processes related to social networking or social networking services - H04L 51/212: using filtering or selective blocking - H04M 1/724: User interfaces specially adapted for cordless or mobile telephones - H04M 1/72403: with means for local support of applications that increase the functionality - H04W 4/12: Messaging; Mailboxes; Announcements - H04W 8/245: {from a network towards a terminal} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract In order to improve cell detection in NR, a user equipment apparatus performs a PSS search on a first frequency raster from a group of frequency rasters. When the UE detects a PSS on the first frequency raster corresponding to a PSS hypothesis, the UE searches for an SS on a second frequency raster based at least on part on the detected PSS hypothesis on the first frequency raster. The UE may search for a plurality of hypotheses of the SS corresponding to the detected PSS hypothesis on the first frequency raster and the second frequency raster. The second frequency raster may be selected from the group of frequency rasters based at least in part on the detected PSS hypothesis or the first frequency raster on which the PSS was detected. ## Claims ### Claim 1 A method of wireless communication at a user equipment, comprising: performing a primary synchronization signal (PSS) search on a first frequency raster from a group of frequency rasters; detecting a PSS on the first frequency raster corresponding to a PSS hypothesis; and searching for a synchronization signal on a second frequency raster based at least in part on the PSS hypothesis of the detected PSS on the first frequency raster. ### Claim 2 (depends on 1) The method of claim 1, wherein the PSS hypothesis is based on a corresponding time, frequency, and PSS identifier (ID). ### Claim 3 (depends on 1) The method of claim 1, wherein the second frequency raster is selected from the group of frequency rasters based at least in part on the PSS hypothesis of the detected PSS or the first frequency raster on which the PSS was detected. ### Claim 4 (depends on 1) The method of claim 1, further comprising: searching for a secondary synchronization signal (SSS) on the first frequency raster, based at least in part on the PSS hypothesis of the detected PSS; and searching for the synchronization signal on the second frequency raster when no SSS is detected on the first frequency raster corresponding to the detected PSS. ### Claim 5 (depends on 1) The method of claim 1, further comprising: searching for at least one of a secondary synchronization signal (SSS) or additional PSS hypothesis on the first frequency raster; and searching for the synchronization signal on the second frequency raster, when no SSS or no additional PSS hypothesis is detected on the first frequency raster within a time period. ### Claim 6 (depends on 1) The method of claim 1, wherein the synchronization signal is a secondary synchronization signal (SSS). ### Claim 7 (depends on 6) The method of claim 6, further comprising: searching for a plurality of hypotheses of the SSS corresponding to the PSS hypothesis of the detected PSS on the first frequency raster and the second frequency raster. ### Claim 8 (depends on 7) The method of claim 7, further comprising: determining a cell detection on a corresponding raster when the SSS corresponding to the detected PSS is detected on the corresponding raster; and continuing the PSS search when no SSS is detected corresponding to the detected PSS. ### Claim 9 (depends on 7) The method of claim 7, wherein the plurality of hypotheses of the SSS is determined based on the PSS hypothesis of the detected PSS. ### Claim 10 (depends on 1) The method of claim 1, wherein the synchronization signal comprises an additional PSS. ### Claim 11 (depends on 10) The method of claim 10, wherein the PSS search performed on the second frequency raster is limited to a limited set of PSS hypothesis based on the PSS hypothesis of the detected PSS on the first frequency raster. ### Claim 12 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled to the memory and configured to: perform a primary synchronization signal (PSS) search on a first frequency raster from a group of frequency rasters; detect a PSS on the first frequency raster corresponding to a PSS hypothesis; and search for a synchronization signal on a second frequency raster based at least in part on the PSS hypothesis on the first frequency raster. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the PSS hypothesis is based on a corresponding time, frequency, and PSS identifier (ID). ### Claim 14 (depends on 12) The apparatus of claim 12, wherein the second frequency raster is selected from the group of frequency rasters based at least in part on the PSS hypothesis of the detected PSS or the first frequency raster on which the PSS was detected. ### Claim 15 (depends on 12) The apparatus of claim 12, wherein the synchronization signal is a secondary synchronization signal (SSS). ### Claim 16 (depends on 14) The apparatus of claim 14, wherein the at least one processor is further configured to: search for a plurality of hypotheses of the SSS corresponding to the PSS hypothesis of the detected PSS on the first frequency raster and the second frequency raster. ### Claim 17 (depends on 12) The apparatus of claim 12, wherein the synchronization signal comprises an additional PSS. ### Claim 18 A computer-readable medium storing computer executable code, comprising code to: perform a primary synchronization signal (PSS) search on a first frequency raster from a group of frequency rasters; detect a PSS on the first frequency raster corresponding to a PSS hypothesis; and search for a synchronization signal on a second frequency raster based at least in part on the PSS hypothesis on the first frequency raster. ### Claim 19 (depends on 18) The computer-readable medium of claim 18, wherein the PSS hypothesis is based on a corresponding time, frequency, and PSS identifier (ID). ### Claim 20 (depends on 18) The computer-readable medium of claim 18, wherein the second frequency raster is selected from the group of frequency rasters based at least in part on the PSS hypothesis of the detected PSS or the first frequency raster on which the PSS was detected.