# US 2014/0155115 A1 · Multi-tone wakeup mechanism for a wireless network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155115 A1 - Document ID: US20140155115A1 - Status: Published application - Kind: A1 - Application number: 13/692,758 - Filed: 2012-12-03 - Published: 2014-06-05 - Earliest claimed: 2012-12-03 - Assignees: Robert Bosch GmbH - Inventors: Abtin Keshavarzian - Web page: https://patentgrep.com/patent/US20140155115A1 ## CPC - H04W 52/0235: {where the received signal is a power saving command} - 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 of operating a wireless network includes sending a pattern of wakeup tones. Each of the wakeup tones has a different frequency. A sleep mode is periodically awoken from to listen for the wakeup tones. The pattern of wakeup tones is received during the listening. It is decided whether to listen for at least one second tone. The deciding is dependent upon the received pattern of wakeup tones. ## Claims ### Claim 1 A method of operating a wireless network, the method including: sending a pattern of wakeup tones, each of the wakeup tones having a different frequency; periodically waking up from a sleep mode to listen for the wakeup tones; receiving the pattern of wakeup tones during the listening; deciding whether to listen for at least one second tone, the deciding being dependent upon the received pattern of wakeup tones. ### Claim 2 (depends on 1) The method of claim 1, wherein the deciding is dependent upon whether the received pattern of wakeup tones matches an expected pattern of wakeup tones. ### Claim 3 (depends on 2) The method of claim 2, wherein the expected pattern of wakeup tones includes a first wakeup tone and at least one of a second wakeup tone and a third wakeup tone. ### Claim 4 (depends on 2) The method of claim 2, wherein the expected pattern of wakeup tones includes a first wakeup tone and/or a second wakeup tone. ### Claim 5 (depends on 2) The method of claim 2, wherein the expected pattern of wakeup tones includes each of a plurality of wakeup tones ### Claim 6 (depends on 1) The method of claim 1, wherein the at least one second tone is one of (i) a tone in a frequency different from the wakeup tones and (ii) a pattern of tones including at least one frequency different from the wakeup tones. ### Claim 7 (depends on 1) The method of claim 1, wherein the at least one second tone indicates a message type, the method comprising the further step, upon receiving the at least one second tone, of performing an action based on the at least one second tone, wherein the action includes at least one of receiving a first message, sending the wakeup tones to another node in the wireless network and transmitting a second message, the second message including a sensor reading. ### Claim 8 (depends on 1) The method of claim 1, wherein the wakeup tones are sent simultaneously by more than one node of the wireless network, and the at least one second tone includes a tone transmitted from each of at least two nodes of the wireless network. ### Claim 9 (depends on 8) The method of claim 8, wherein the at least one second tone includes a first tone and a second tone transmitted simultaneously, the first tone being transmitted by a first node and the second tone being transmitted by a second node. ### Claim 10 (depends on 8) The method of claim 8, wherein the at least one second tone includes a first pattern of tones and a second pattern of tones transmitted simultaneously, the first pattern being transmitted by a first node and the second pattern being transmitted by a second node, the first pattern being different from the second pattern. ### Claim 11 (depends on 1) The method of claim 1, wherein the listening for the wakeup tones includes detecting the presence of a high signal in at least one pre-specified frequency channel, and listening for at least one second tone includes detecting the presence of a high signal in another pre-specified frequency channel. ### Claim 12 (depends on 1) The method of claim 1, wherein the frequency of the at least one second tone indicates a message type from among a plurality of potential message types having different priority levels, the method further comprising: prioritizing the performing of the action according to the priority level of the message type of the at least one second tone. ### Claim 13 A wireless network, comprising: a receiver node that includes: an arrangement to receive a plurality of tones each at a predefined frequency; an energy storage arrangement; and a control arrangement to operate the receiver node in a sleep mode to conserve energy, wherein the receiver node is configured to periodically wake up from the sleep mode to listen for a plurality of wakeup tones, and upon receiving the wakeup tones, listening for at least one second tone. ### Claim 14 (depends on 13) The wireless network of claim 13, wherein the at least one second tone is one of (i) a tone in a frequency different from the wakeup tones and (ii) a pattern of tones in at least one frequency different from the wakeup tones, the receiver node further including an arrangement to perform an action based on the at least one second tone. ### Claim 15 (depends on 14) The wireless network of claim 14, wherein the receiver node includes at least one of a sensor and an actuator. ### Claim 16 (depends on 13) The wireless network of claim 13, further comprising at least one transmitter node to transmit the wakeup tones and the at least one second tone. ### Claim 17 A wireless node, comprising: a power storage arrangement; and an arrangement to receive a plurality of tones each at a predefined frequency, wherein the wireless node is configured to periodically listen for a pattern of wakeup tones, and upon receiving the wakeup tones, listen for at least one second tone, the at least one second tone being one of (i) a tone in a frequency different from the wakeup tones and (ii) a pattern of tones that includes at least one frequency different from the wakeup tones. ### Claim 18 (depends on 17) The wireless node of claim 17, further comprising: an arrangement to perform an action based on the at least one second tone. ### Claim 19 (depends on 18) The wireless node of claim 18, wherein the at least one second tone includes a first tone and a second tone transmitted simultaneously, the first tone being transmitted by a first node and the second tone being transmitted by a second node. ### Claim 20 (depends on 18) The wireless node of claim 18, wherein the at least one second tone includes a first pattern of tones and a second pattern of tones transmitted simultaneously, the first pattern being transmitted by a first node and the second pattern being transmitted by a second node.