Wake-up in class-based networking
A method for communicating to a recipient transceiver from a plurality of transceivers located within the broadcast range of the recipient transceiver includes: transmitting a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and subsequent thereto, transmitting a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers. Each of the plurality of transceivers is associated with a respective sensor for acquiring data and transmitting the data to the recipient transceiver.
1. A wireless reader tag (WRT) comprising:
a reader component for transmitting a wake-up message using a reader component to initiate communication in an ad hoc network with a gateway having a WT component for wake-up;
a low-power radio frequency (LPRF) communications component for transmitting data packets to the gateway having a LPRF communications component subsequent to initiating communications by transmitting the wake-up message; and
a digital processor in communication with the reader component and the LPRF communications component;
wherein the WRT includes a profile identifying a class of the WRT and is synchronized to allow scheduled communications at regular intervals based on a duty cycle for the identified class of the WRT, at which times the gateway will be accepting data communications from WRTs having such identified class, the WRT being configured for
determining a time at which the gateway will be accepting data communications from WRTs having the identified class based on the received profile information;
causing the reader component to power up and transmit the wake-up message to the gateway at the determined time;
causing the LPRF communications component to power up and transmit at least one data packet to the gateway subsequent to transmitting the wake-up message;
receiving, by the WRT, updated profile information including a new class of the WRT, the new class of the WRT corresponding to a different duty cycle, thereby resulting in a changed availability of the gateway for class-based communications with the WRT.
2. A method of transmitting data from a wireless reader tag (WRT) to a gateway in an ad hoc network comprising:
determining, by the WRT, a time at which the gateway of the ad hoc network will be accepting data packets based on a duty cycle for a class of the WRT, the class being a class included in profile information received by the WRT from the gateway;
powering up a reader component of the WRT at the determined time;
transmitting, by the WRT, a wake-up message to the gateway at the determined time using the powered-up reader component;
transmitting, by the WRT, after the transmission of the wake-up message, a data packet to the gateway using a low-power radio frequency (LPRF) communications component of the WRT; and
receiving, by the WRT, updated profile information including an updated class of the WRT, the new class of the WRT corresponding to a different duty cycle, thereby resulting in a changed availability of the gateway for class-based communications with the WRT.
3. A wireless reader tag (WRT) comprising:
a reader component for transmitting a wake-up message using a reader component to initiate communication in an ad hoc network with a gateway having a WT component for wake-up;
a low-power radio frequency (LPRF) communications component for transmitting data packets to the gateway having a LPRF communications component subsequent to initiating communications by transmitting the wake-up message; and
a digital processor in communication with the reader component and the LPRF communications component;
wherein the WRT includes a profile identifying a class of the WRT and is synchronized to allow scheduled communications for the identified class of the WRT, at which times the gateway will be accepting data communications from WRTs having such identified class, the WRT being configured for
determining a time at which the gateway will be accepting data communications from WRTs having the identified class based on the received profile information;
causing the reader component to power up and transmit the wake-up message to the gateway at the determined time;
causing the LPRF communications component to power up and transmit at least one data packet to the gateway subsequent to transmitting the wake-up message;
receiving, by the WRT, updated profile information including a new class of the WRT, thereby resulting in a changed availability of the gateway for class-based communications with the WRT.