# US 8,751,848 B2 · System and method for handling a power outage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,751,848 B2 - Document ID: US8751848B2 - Status: Granted - Kind: B2 - Application number: 13/411,118 - Filed: 2012-03-02 - Published: 2012-09-06 - Granted: 2014-06-10 - Earliest claimed: 2011-03-04 - Assignees: Futurewei Technologies, Inc. - Applicants: Erik Colban; George Calcev; Bin Chen; George Cummings - Inventors: Erik Colban; George Calcev; Bin Chen; George Cummings - Web page: https://patentgrep.com/patent/US8751848B2 ## CPC - H04W 72/563: of the wireless resources - H04W 52/54: Signalisation aspects of the TPC commands, e.g. frame structure - H04W 52/225: {Calculation of statistics, e.g. average or variance} - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for reporting a power outage to a communications controller includes detecting the power outage, and selecting a transmission slot from a plurality of transmission slots in order to report the power outage to the communications controller, the transmission slot selected according to a non-uniform probability distribution function, the non-uniform probability distribution function is monotonic with time after the power outage. The method also includes transmitting a first power outage indicator to the communications controller in the transmission slot selected. ## Claims ### Claim 1 A method in a wireless device for reporting a power outage to a communications controller, the method comprising: detecting with the wireless device the power outage; selecting with the wireless device a transmission slot from a plurality of transmission slots in order to report the power outage to the communications controller, the transmission slot selected according to a non-uniform probability distribution function, the non-uniform probability distribution function is monotonic with time after the power outage, wherein the transmission slot is selected according to a time to live for the wireless device; transmitting an initial power outage indicator to the communications controller in the transmission slot selected; receiving an allocation of a network resource from the communications controller; and transmitting a subsequent power outage indicator to the communications controller using the network resource. ### Claim 2 (depends on 1) The method of claim 1, wherein selecting the transmission slot comprises selecting a virtual transmission slot from a plurality of virtual transmission slots according to the non-uniform probability distribution function; and mapping the virtual transmission slot to the transmission slot. ### Claim 3 (depends on 1) The method of claim 1, wherein the transmission slot comprises a ranging slot or a random access channel. ### Claim 4 (depends on 1) The method of claim 1, wherein the initial power outage indicator comprises a ranging code. ### Claim 5 (depends on 4) The method of claim 4, wherein the ranging code comprises a modulated binary sequence. ### Claim 6 (depends on 4) The method of claim 4, wherein the ranging code is one of a prespecified value and a configurable parameter. ### Claim 7 (depends on 1) The method of claim 1, wherein the non-uniform probability distribution function comprises an exponential distribution function, a monotonically increasing distribution function, or a monotonically decreasing distribution function. ### Claim 8 (depends on 1) The method of claim 1, wherein the non-uniform probability distribution function has a cumulative distribution function expressible as F ⁡ ( t ) = N t / b - 1 N - 1 , where b is a backoff window size, t is a transmission slot number according to the initial ordering of the plurality of transmission slots, and N is a value of a configurable system parameter. ### Claim 9 (depends on 8) The method of claim 8, wherein the configurable system parameter is an Abnormal Power Down Ranging Opportunity Selection Parameter. ### Claim 10 (depends on 1) The method of claim 1, wherein the subsequent power outage indicator comprises identification information of a device impacted by the power outage, outage information associated with the power outage, extent information associated with an extent of the power outage, or a combination thereof. ### Claim 11 A method in a wireless communication controller for responding to a power outage, the method comprising: receiving, at the wireless communication controller, in a transmission slot an initial power outage indicator from a served device out of several devices being served, use of the transmission slot having been selected by the served device according to a non-uniform probability distribution function, the transmission slot having been selected by the served device according to a time to live of the served device; allocating a network resource to the served device; transmitting an allocation of the network resource to the served device; and receiving a subsequent power outage indicator via the allocated network resource. ### Claim 12 (depends on 11) The method of claim 11, wherein the allocating and the transmitting are expedited. ### Claim 13 (depends on 11) The method of claim 11, further comprising transmitting initial related information about the initial power outage indicator to a potential entity possibly associated with the served device. ### Claim 14 (depends on 11) The method of claim 11, wherein the subsequent power outage indicator comprises identification information of the served device, outage information associated with the power outage, extent information associated with an extent of the power outage, or a combination thereof. ### Claim 15 (depends on 11) The method of claim 11, further comprising transmitting subsequent related information about the subsequent power outage indicator to a responsible entity associated with the served device, wherein the responsible entity is identified according to the subsequent power outage indicator. ### Claim 16 A device comprising: a processor configured to detect a power outage, and to select a transmission slot from a plurality of transmission slots in order to report the power outage to a communications controller, the transmission slot selected according to a non-uniform probability distribution function, the non-uniform probability distribution function is monotonic with time after the power outage, wherein the transmission slot is selected according to a time to live for the device; and a transmitter operatively coupled to the processor, the transmitter configured to transmit an initial power outage indicator to the communications controller in the transmission slot selected; and a receiver operatively coupled to the processor, the receiver configured to receive an allocation of a network resource from the communications controller, and wherein the transmitter is configured to transmit a subsequent power outage indicator to the communications controller using the network resource. ### Claim 17 (depends on 16) The device of claim 16, wherein the processor is configured to select a virtual transmission slot from a plurality of virtual transmission slots according to the non-uniform probability distribution function, and to map the virtual transmission slot to the transmission slot. ### Claim 18 (depends on 16) The device of claim 16, wherein the transmission slot comprises a ranging slot or a random access channel. ### Claim 19 (depends on 16) The device of claim 16, wherein the initial power outage indicator comprises a ranging code. ### Claim 20 (depends on 19) The device of claim 19, wherein the ranging code comprises a modulated binary sequence. ### Claim 21 (depends on 19) The device of claim 19, wherein the ranging code is one of a prespecified value and a configurable parameter. ### Claim 22 (depends on 16) The device of claim 16, wherein the non-uniform probability distribution function has a cumulative distribution function expressible as F ⁡ ( t ) = N t / b - 1 N - 1 , where b is a backoff window size, t is a transmission slot number according to the initial ordering of the plurality of transmission slots, and N is a value of a configurable system parameter. ### Claim 23 A communications controller comprising: a receiver configured to receive in a transmission slot an initial power outage indicator from a served device out of several devices being served, use of the transmission slot having been selected by the served device according to a non-uniform probability distribution function, the transmission slot having been selected according to a time to live for the served device, wherein the receiver is configured to receive a subsequent power outage indicator, via an allocation of a network resource; a processor operatively coupled to the receiver, the processor configured to allocate the network resource to the served device; and a transmitter operatively coupled to the processor, the transmitter configured to transmit the allocation of the network resource to the served device. ### Claim 24 (depends on 23) The communications controller of claim 23, wherein the transmitter is configured to transmit initial related information about the initial power outage indicator to a potential entity possibly associated with the served device. ### Claim 25 (depends on 23) The communications controller of claim 23, wherein the transmitter is configured to transmit subsequent related information about the subsequent power outage indicator to a responsible entity associated with the served device, wherein the responsible entity is identified according to the subsequent power outage indicator.