# US 9,521,602 B2 · Method and apparatus for management of high frequency communications in a low frequency wireless network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,602 B2 - Document ID: US9521602B2 - Status: Granted - Kind: B2 - Application number: 14/454,467 - Filed: 2014-08-07 - Published: 2015-02-12 - Granted: 2016-12-13 - Earliest claimed: 2013-08-09 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Hao Xu; Yongbin Wei - Web page: https://patentgrep.com/patent/US9521602B2 ## CPC - H04W 36/0033: {with transfer of context information} - H04W 36/247: {by using coverage extension} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 76/15: Setup of multiple wireless link connections - H04W 16/32: Hierarchical cell structures - H04W 36/04: Reselecting a cell layer in multi-layered cells - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Wireless communication systems and methods are described where communication is established with a user device at a low frequency. Coarse channel information, such as pathloss, power delay profile, and multipath direction information, regarding the communication between a wireless network device and the user device at the low frequency may then be used to establish communication with the user device at a high frequency. ## Claims ### Claim 1 A method of wireless communication, comprising: establishing, by at least one wireless network device, communication with a user device at a low frequency; identifying, by the at least one wireless network device, coarse channel properties related to the communication between the at least one wireless network device and the user device at the low frequency; establishing, by the at least one wireless network device, communication with the user device at a high frequency by utilizing the coarse channel properties related to communication at the low frequency to steer a beam that conveys the communication at the high frequency toward the user device; and maintaining the communication at the high frequency by continuing the communication at the low frequency to obtain the related coarse channel properties to tune the communication at the high frequency in response to environmental changes. ### Claim 2 (depends on 1) The method of claim 1, wherein the low frequency includes at least one of licensed or unlicensed spectrum; wherein high frequency includes at least one of licensed spectrum or unlicensed spectrum; and wherein the coarse channel properties related to the licensed spectrum of the low frequency are used in the establishing communication at the high frequency. ### Claim 3 (depends on 1) The method of claim 1, wherein the coarse channel properties include at least one of path loss, power delay profile, multipath direction, angle of arrival, angle of departure information, or location information regarding a location of the user device with respect to the at least one wireless network device. ### Claim 4 (depends on 1) The method of claim 1, further including monitoring, by the at least one wireless network device in communication with the user device at the low frequency, whether the user device is in range of a second network device which is configured to communicate with the user device at the high frequency. ### Claim 5 (depends on 4) The method of claim 4, further including activating the second network device when the user device is in range of the second network device. ### Claim 6 (depends on 5) The method of claim 5, further including providing, by the at least one wireless network device, the coarse channel properties to the second network device for establishing high frequency communication with the user device. ### Claim 7 (depends on 1) The method of claim 1, further including transmitting information corresponding to one or more high frequency communication network devices to the user device. ### Claim 8 (depends on 1) The method of claim 1, further including directing a high frequency transmission beam based on the coarse channel properties identified with regard to the communication at the low frequency. ### Claim 9 (depends on 1) The method of claim 1, wherein the coarse channel properties are identified in accordance with one or more of: transmissions received from the user device, or an independent determination by the at least one wireless network. ### Claim 10 A method of wireless communication, comprising: communicating, by a user device, with at least one network device at a low frequency; and receiving, at the user device, a high frequency communication directed to the user device from the at least one network device based on coarse channel properties associated with the communicating at the low frequency, wherein the coarse channel properties associated with the communicating at the low frequency are utilized to steer a beam that conveys the high frequency communication toward the user device, wherein the high frequency communication is maintained based on the coarse channel properties associated with the communicating at the low frequency that are continually obtained from the communicating at the low frequency to tune the high frequency communication in response to environmental changes. ### Claim 11 (depends on 10) The method of claim 10, wherein the low frequency includes at least one of licensed spectrum or unsilenced spectrum; wherein high frequency includes at least one of licensed spectrum or unlicensed spectrum; and wherein the coarse channel properties associated with the licensed spectrum of the low frequency are used in a direction of the high frequency communication to the user device. ### Claim 12 (depends on 10) The method of claim 10, wherein the communicating by the user device with the at least one network device includes communicating the coarse channel properties to the at least one network device. ### Claim 13 (depends on 10) The method of claim 10, wherein the coarse channel properties include at least one of: path loss, power delay profile, multipath direction, angle of arrival, angle of departure information, or location information regarding a location of the user device with respect to the at least one network device. ### Claim 14 (depends on 10) The method of claim 10, further including receiving a second high frequency communication from a second network device different from the at least one network device. ### Claim 15 (depends on 14) The method of claim 14, further including: transmitting and receiving, by the user device, control information with the at least one network device at the low frequency; and transmitting and receiving, by the user device, data information with the second network device with the high frequency communication. ### Claim 16 An apparatus for wireless communication, comprising: at least one processor configured to: establish communication by at least one wireless network device with a user device at a low frequency; identify by the at least one wireless network device coarse channel properties related to the communication between the at least one wireless network device and the user device at the low frequency; establish by the at least one wireless network device communication with the user device at a high frequency by utilizing the coarse channel properties of the communication at the low frequency to steer a beam that conveys the communication at the high frequency toward the user device; and maintain the communication at the high frequency by continuing the communication at the low frequency to obtain the related coarse channel properties to tune the communication at the high frequency in response to environmental changes; a memory coupled to the at least one processor. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the low frequency includes at least one of licensed spectrum or unlicensed spectrum; wherein high frequency includes at least one of licensed spectrum or unlicensed spectrum; and wherein the coarse channel properties related to the licensed spectrum of the low frequency are used in the configuration of the at least one processor to establish communication at the high frequency. ### Claim 18 (depends on 16) The apparatus of claim 16, wherein the coarse channel properties include at least one of path loss, power delay profile, multipath direction, angle of arrival, angle of departure information, or location information regarding a location of the user device with respect to the at least one wireless network device. ### Claim 19 (depends on 16) The apparatus of claim 16, wherein the at least one processor is configured to monitor whether the user device is in range of a second network device which is configured to communicate with the user device at the high frequency. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the at least one processor is configured to activate the second network device when the user device is in range of the second network device. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the at least one processor is further configured to provide, by the at least one network device, the coarse channel properties to the second network device for establishing high frequency communication with the user device. ### Claim 22 (depends on 16) The apparatus of claim 16, further including configuration of the at least one processor to transmit information corresponding to one or more high frequency communication network devices to the user device. ### Claim 23 (depends on 16) The apparatus of claim 16, wherein at least one processor is configured to direct a high frequency transmission beam based on the coarse channel properties identified with regard to the communication at the low frequency. ### Claim 24 (depends on 16) The apparatus of claim 16, wherein the coarse channel properties are identified in accordance with one or more of: transmissions received from the user device, or an independent determination by the at least one wireless network. ### Claim 25 An apparatus for wireless communication, comprising: at least one processor configured to: communicate, by a user device, with at least one network device at a low frequency; and receive, at the user device, a high frequency communication directed to the user device from the at least one network device based on coarse channel properties associated with the configuration of the at least one processor to communicate at the low frequency, wherein the coarse channel properties associated with the configuration of the at least one processor to communicate at the low frequency are utilized to steer a beam that conveys the high frequency communication toward the user device, wherein the high frequency communication is maintained based on the coarse channel properties associated with the configuration of the at least one processor to communicate at the low frequency that are continually obtained from the communicating at the low frequency to tune the high frequency communication in response to environmental changes; and a memory coupled to the at least one processor. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the low frequency includes at least one of licensed spectrum or unlicensed spectrum; wherein high frequency includes at least one of licensed spectrum or unlicensed spectrum; and wherein the coarse channel properties associated with the licensed spectrum of the low frequency are used in a direction of the high frequency communication to the user device. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the configuration of the at least one processor to communicate by the user device with the at least one network device includes configuration of the at least one processor to communicate the coarse channel properties to the at least one network device. ### Claim 28 (depends on 25) The apparatus of claim 25, wherein the coarse channel properties include at least one of: path loss, power delay profile, multipath direction, angle of arrival, angle of departure information, or location information regarding a location of the user device with respect to the at least one wireless network device for the configuration of the at least one processor to communicate at the low frequency between the user device and the at least one network device. ### Claim 29 (depends on 25) The apparatus of claim 25, wherein the at least one processor is configured to receive a second high frequency communication from a second network device different from the at least one network device. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the at least one processor is configured: to transmit and receive control information with the at least one network device at the low frequency; and to transmit and receive data information with the second network device with the high frequency communication.