# US 10,772,078 B2 · Techniques and apparatuses for synchronization signal resource selection for a wireless backhaul network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,078 B2 - Document ID: US10772078B2 - Status: Granted - Kind: B2 - Application number: 15/945,663 - Filed: 2018-04-04 - Published: 2018-12-13 - Granted: 2020-09-08 - Earliest claimed: 2017-06-08 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Navid Abedini; Muhammad Nazmul Islam; Sundar Subramanian; Karl Georg Hampel; Juergen Cezanne; Junyi Li - Web page: https://patentgrep.com/patent/US10772078B2 ## CPC - H04W 72/04: Wireless resource allocation - H04W 56/0005: {synchronizing of arrival of multiple uplinks} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Certain aspects of the present disclosure generally relate to wireless communication. A wireless node may determine a connectivity state of the wireless node with respect to a wireless network, may determine a set of resources available for one or more synchronization communications based at least in part on the connectivity state, may select one or more resources from the set of resources, and may transmit the one or more synchronization communications using the one or more resources. Numerous other aspects are provided. ## Claims ### Claim 1 A method of wireless communication, comprising: determining, by a wireless node, a connectivity state of the wireless node with respect to a wireless network, wherein the connectivity states indicates: that a threshold amount of time has not elapsed since the wireless node lost a connection with at least one other wireless node, and one or more of: that the wireless node is an anchor node that is connected to a core network, or a number of hops from the wireless node to the anchor node that is connected to the core network; determining, by the wireless node, a set of resources available for one or more synchronization communications based at least in part on the connectivity state; selecting, by the wireless node, one or more resources from the set of resources using a reference timing associated with a cluster of wireless nodes in communication with the wireless node; and transmitting, by the wireless node, the one or more synchronization communications using the one or more resources. ### Claim 2 (depends on 1) The method of claim 1, wherein the connectivity state further indicates that the wireless node is connected to at least one other wireless node via a wireless link of the wireless network. ### Claim 3 (depends on 1) The method of claim 1, wherein the set of resources is associated with a reference timing used by the wireless node and at least one other wireless node to which the wireless node is connected. ### Claim 4 (depends on 1) The method of claim 1, wherein the set of resources includes one or more second resources that are different from one or more first resources associated with a reference timing used by the wireless node and at least one other wireless node. ### Claim 5 (depends on 4) The method of claim 4, wherein the one or more second resources do not overlap with the one or more first resources. ### Claim 6 (depends on 4) The method of claim 4, wherein the one or more second resources have a fixed time offset or a fixed frequency offset from the one or more first resources. ### Claim 7 (depends on 1) The method of claim 1, wherein the connectivity state further indicates that the wireless node is not connected to another wireless node via a wireless link. ### Claim 8 (depends on 1) The method of claim 1, wherein the connectivity state further indicates that the wireless node has not been connected to another wireless node via a wireless link for a threshold amount of time. ### Claim 9 (depends on 1) The method of claim 1, wherein the set of resources is associated with a reference timing used by the wireless node. ### Claim 10 (depends on 1) The method of claim 1, wherein the connectivity state further indicates that the wireless node is connected to a core network. ### Claim 11 (depends on 1) The method of claim 1, wherein the set of resources is determined based on an indication by one or more devices of a core network. ### Claim 12 (depends on 1) The method of claim 1, wherein the one or more resources are selected based at least in part on one or more of: the number of hops from the wireless node to the anchor node that is connected to the core network, an index that indicates resources allocated to the wireless node, a random seed, one or more signals detected or measured on the set of resources, an indication from an upper layer, a communication received from at least one other wireless node, or some combination thereof. ### Claim 13 (depends on 1) The method of claim 1, wherein the connectivity state further indicates at least one of: that the wireless node is connected to at least one other wireless node via a wireless link, that the wireless node is not connected to another wireless node via the wireless link, whether the cluster of wireless nodes is connected to the core network or some combination thereof. ### Claim 14 (depends on 1) The method of claim 1, wherein the method further comprises indicating the connectivity state using one or more of: a synchronization signal, a physical broadcast channel, system information carried in any combination of a master information block (MIB), a system information block (SIB), minimum system information (SI), or other SI, a radio resource control signaling message, a medium access control message, an upper layer message, or some combination thereof. ### Claim 15 (depends on 1) The method of claim 1, wherein the one or more synchronization communications include at least one of: a primary synchronization signal, a secondary synchronization signal, a physical broadcast channel communication, or some combination thereof. ### Claim 16 (depends on 1) The method of claim 1, wherein the one or more synchronization communications are one or more synchronization signal (SS) blocks. ### Claim 17 (depends on 1) The method of claim 1, wherein the wireless node is a base station. ### Claim 18 (depends on 1) The method of claim 1, wherein the wireless node is a user equipment. ### Claim 19 (depends on 1) The method of claim 1, wherein the wireless node communicates via the wireless network using millimeter waves. ### Claim 20 A wireless node for wireless communication, comprising: memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine a connectivity state of the wireless node with respect to a wireless network, wherein the connectivity states indicates: that a threshold amount of time has not elapsed since the wireless node lost a connection with at least one other wireless node, and one or more of: that the wireless node is an anchor node that is connected to a core network, or a number of hops from the wireless node to the anchor node that is connected to the core network; determine a set of resources available for one or more synchronization communications based at least in part on the connectivity state; select one or more resources from the set of resources using a reference timing associated with a cluster of wireless nodes in communication with the wireless node; and transmit the one or more synchronization communications using the one or more resources. ### Claim 21 (depends on 20) The wireless node of claim 20, wherein the connectivity state further indicates that the wireless node is connected to at least one particular wireless node via a wireless link of the wireless network, and wherein the set of resources is associated with a reference timing used by the wireless node and the at least one particular wireless node. ### Claim 22 (depends on 20) The wireless node of claim 20, wherein the set of resources includes one or more second resources that are different from one or more first resources associated with a reference timing used by the wireless node and at least one other wireless node. ### Claim 23 (depends on 22) The wireless node of claim 22, wherein the one or more second resources: do not overlap with the one or more first resources, have a fixed time offset or a fixed frequency offset from the one or more first resources, or some combination thereof. ### Claim 24 (depends on 20) The wireless node of claim 20, wherein the connectivity state further indicates that the wireless node is not connected to another wireless node via a wireless link, and wherein the set of resources is associated with a reference timing used by the wireless node. ### Claim 25 (depends on 20) The wireless node of claim 20, wherein the connectivity state further indicates that the wireless node is connected to the core network, and wherein the set of resources is determined based on an indication by one or more devices of the core network. ### Claim 26 (depends on 20) The wireless node of claim 20, wherein the one or more resources are selected based at least in part on one or more of: the number of hops from the wireless node to the anchor node that is connected to the core network, an index that indicates resources allocated to the wireless node, a random seed, one or more signals detected or measured on the set of resources, an indication from an upper layer, a communication received from at least one other wireless node, or some combination thereof. ### Claim 27 (depends on 20) The wireless node of claim 20, wherein the connectivity state further indicates at least one of: that the wireless node is connected to at least one other wireless node via a wireless link, that the wireless node is not connected to another wireless node via the wireless link, whether the cluster of wireless nodes is connected to the core network, or some combination thereof. ### Claim 28 A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: one or more instructions that, when executed by one or more processors of a wireless node, cause the one or more processors to: determine a connectivity state of the wireless node with respect to a wireless network, wherein the connectivity states indicates: that a threshold amount of time has not elapsed since the wireless node lost a connection with at least one other wireless node, and one or more of: that the wireless node is an anchor node that is connected to a core network, or a number of hops from the wireless node to the anchor node that is connected to the core network; determine a set of resources available for one or more synchronization communications based at least in part on the connectivity state; select one or more resources from the set of resources using a reference timing associated with a cluster of wireless nodes in communication with the wireless node; and transmit the one or more synchronization communications using the one or more resources. ### Claim 29 An apparatus for wireless communication, comprising: means for determining a connectivity state of the apparatus with respect to a wireless network, wherein the connectivity states indicates: that a threshold amount of time has not elapsed since the apparatus lost a connection with at least one other apparatus, and one or more of: that the apparatus is an anchor node that is connected to a core network, or a number of hops from the apparatus to the anchor node that is connected to the core network; means for determining a set of resources available for one or more synchronization communications based at least in part on the connectivity state; means for selecting one or more resources from the set of resources using a reference timing associated with a cluster of apparatuses in communication with the apparatus; and means for transmitting the one or more synchronization communications using the one or more resources. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the set of resources includes one or more second resources that are different from one or more first resources associated with a reference timing used by the apparatus and at least one other apparatus.