Method and system for scheduling transmit time slots for network-connected measurement units
地域：
Jerusalem
摘要
Provided herein a system and a method that may include the following steps: receiving data from one or more sensors configured to measure one or more predefined metrics of an infrastructure; establishing a wireless channel with a wireless network; obtaining time-varying characteristics of the wireless network; and determining a series of transmission time slots for transmitting the data received from the sensor, based on the time-varying characteristics, for reducing overall power consumption of the data transmission.
說(shuō)明書
This application is claims priority of Great Britain Patent Application No. GB 1519069.7, filed Oct. 28, 2015, which is hereby incorporated by reference.
The present invention relates generally to the field of sensor networks, and in particular, such networks that include sensors that transmit measurements via a wireless channel.
Many infrastructure systems such as water pipes and drainage systems require measurements of their operation on an ongoing basis. Sensors, of many kinds and types, are being deployed on site in order to measure various metrics and transmit the measurements, usually via a communication network, to a centralized control center, where the data is being analyzed. These sensors are usually energetically autonomous and are equipped with their own power source, which is usually in the form of a battery and therefore has a limited capacity.
Since, in most cases, the communication network is a wireless communication network (such as a cellular communication network), a strict usage of power is dictated. Specifically, as the amount of load or congestion over the communication network varies over time affecting the traffic, so does the power consumption that is required for transmitting a specific amount of data from the sensors.
權(quán)利要求
The invention claimed is:1. A method of reducing power consumption at a transmission node being a part of a wireless network, the method comprising:obtaining by at least one transmission node, physically connected to at least one sensor, data from the at least one sensor configured to measure at least one physical metric; establishing a wireless channel between said transmission node and a wireless network; obtaining, at said transmission node, time dependent parameters indicative of a power consumption of transmission of said obtained data by said at least one transmission node to said wireless channel; and determining a series of transmission time slots for transmitting said obtained data by said transmission node, based on said time-varying characteristics, for reducing the power consumption caused by the data transmission by said transmission node. 2. The method according to claim 1 , wherein said obtaining of time-varying characteristics of said wireless network is carried out over a training period. 3. The method according to claim 1 , wherein said obtaining of time-varying characteristics of said wireless network is carried out by associating cost, in power consumption terms, to each possible transmission time slot. 4. The method according to claim 3 , wherein said cost is directly measured while transmitting the data from the transmission node over the wireless channel. 5. The method according to claim 3 , wherein said cost is derived from a traffic level of the wireless network as reflected by the wireless channel. 6. A method of reducing power consumption at a transmission node being a part of a wireless network, the method comprising:obtaining by at least one transmission node, data from at least one sensor configured to measure at least one physical metric of an infrastructure system; establishing a wireless channel between said transmission node and a wireless network; obtaining, at said transmission node, time dependent parameters indicative of a power consumption of transmission of said obtained data by said at least one transmission node to said wireless channel; and determining a series of transmission time slots for transmitting said obtained data by said transmission node, based on said time-varying characteristics, for reducing the consumption caused by the data transmission by said transmission node, wherein the series of transmission time slots for transmitting are determined by finding a shortest path over a directed acyclic graph (DAG) whose nodes denote valid transmission time slots and edges are associated with a cost, in power consumption terms. 7. The method according to claim 6 , wherein the valid transmission time slots are defined as time slots that define a maximal interval therebetween, beyond which data from the sensors is insufficiently fresh. 8. The method according to claim 7 , wherein the valid transmission time slots are further defined as time slots that define a minimal interval therebetween, beyond which data from the sensors is redundant. 9. The method according to claim 1 , wherein the reducing of overall power consumption of the data transmission is carried out by optimizing the amount of data transmitted per level of power consumed. 10. The method according to claim 1 , further comprising analyzing in a central location, all series of transmission time slots of determined by a plurality of communication devices, for updating the time series based on the analysis. 11. A transmission node configured for reducing power consumption, comprising:an input circuitry for obtaining data from at least one sensor physically connected to said transmission node, wherein the at least one sensor is configured to measure at least one physical metric of an infrastructure system; a communication circuitry for establishing a wireless channel between said transmission node and a wireless network; a processor forobtaining, at said transmission node, time dependent parameters indicative of a power consumption of transmission of said obtained data by said least one transmission node to said wireless channel; and determining a series of transmission time slots for transmitting said obtained data by said transmission node, based on said time-varying characteristics, for reducing overall power consumption of the data transmission by said transmission node. 12. The transmission node according to claim 11 , wherein said obtaining of time-varying characteristics of said wireless network is carried out over a training period. 13. The transmission node according to claim 11 , wherein said obtaining of time-varying characteristics of said wireless network is carried out by associating cost, in power consumption terms, to each possible transmission time slot. 14. The transmission node according to claim 13 , wherein said cost is directly measured while transmitting the data from the sensor over the wireless channel. 15. The transmission node according to claim 13 , wherein said cost is derived from a traffic level of the wireless network as reflected by the wireless channel. 16. A transmission node configured for reducing power consumption, comprising:an input circuit for obtaining data from at least one sensor configured to measure at least one physical metric of an infrastructure system; a communication circuitry for establishing a wireless channel between said transmission node and a wireless network; a processor forobtaining, at said transmission node, time dependent parameters indicative of a power consumption of transmission of said obtained data by said least one transmission node to said wireless channel; and determining a series of transmission time slots for transmitting said obtained data by said transmission node, based on said time-varying characteristics, for reducing overall power consumption of the data transmission by said transmission node, wherein the series of transmission time slots for transmitting are determined by finding a shortest path over a directed acyclic graph (DAG) whose nodes denote valid transmission time slots and edges are associated with a cost, in power consumption terms. 17. The transmission node according to claim 16 , wherein the valid transmission time slots are defined as time slots that define a maximal interval therebetween, beyond which data from the sensors is insufficiently fresh. 18. The transmission node according to claim 17 , wherein the valid transmission time slots are further defined as time slots that define a minimal interval therebetween, beyond which data from the sensors is redundant. 19. The transmission node according to claim 11 , wherein the reducing of overall power consumption of the data transmission is carried out by optimizing the amount of data transmitted per level of power consumed. 20. The transmission node according to claim 11 , further comprising analyzing in a central location, all series of transmission time slots of determined by a plurality of communication devices, for updating the time series based on the analysis.
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