Abstract: A preamble detector for a Bluetooth Long Range includes a receiver for forming baseband samples from Bluetooth packets and a preamble detect controller for enabling and disabling power to the receiver. Where the preamble duration is Tcyc, the preamble detector turns on for a preamble detect time T1 and turns off for a duration T2, where T2=Tcyc?2*T1. A series of hierarchical decisions is made on sequentially increasing intervals of time based on an accumulated correlation result of correlating the baseband samples against a SYNC sequence to power the receiver back down before the end of the T1 period when the accumulated correlation result is below a threshold and continues to a subsequent correlation interval when the accumulated correlation result is above a threshold, where the threshold is established to have at least a 20% false alarm rate for preamble detection.

Abstract: The present invention relates to a method and system of secure wakeup in a communication system. The method comprises: transmitting a predetermined wakeup code by a wakeup transmitter of a first node to a wakeup receiver of a second node using a first communication link; establishing a protocol for future wakeup codes periodically between the first node and the second node using a second communication link; wherein the wakeup code is updated based on at least one of: the protocol for future wakeup codes, a first function of time defined by protocol for future wakeup codes, a second function of number of wakeups defined by protocol for future wakeup codes; comparing the wakeup code received by the second node with the wakeup code sent by the first node; and if the wakeup code received by the second node matches a template wakeup code derived from a protocol for future wakeup codes, then the receiver wakes up; otherwise the receiver does not wakeup.

Abstract: An IoT device has a public device identifier and a private device identifier, where the public device identifier is publicly available and the private device identifier is secret but kept in a secure device database as a tuple. A registration request containing encrypted credentials comprising at least a private identifier and optionally a public identifier is sent from the IoT device to an association server in communication with a device database having an association between IoT public identifier and a corresponding IoT private identifier. The association server which receives the registration request and encrypted credentials responds with a registration acknowledgement when the decrypted credentials match the tuple in the device database, or forwards the request to a registration server when it does not. The requesting IoT device receives an acknowledgement and is thereafter able to join the wireless network.

Abstract: A system for transmission of incident information includes maintaining a table of RSSI values for a plurality of stations. When an incident is detected, the system first sends a broadcast packet with incident information, and next sends a unicast packet to any station below a particular RSSI threshold until the unicast packet is acknowledged or a retransmission interval passes.

Abstract: A wireless receiver has a preamble detection apparatus and method which waits until the expected arrival of a beacon frame, after which power is cyclically applied during a preamble detection interval and a sleep interval until a preamble is detected. The preamble detector has a first mode with a longer preamble detection interval and a second mode with a shorter preamble detection interval. During the preamble detection interval, power is applied to receiver components, and during the sleep interval, power is not applied. The duration of the preamble detection interval is equal to a preamble sensing interval, and if a preamble is detected, power remains applied to a preamble processor for a preamble processing interval. The duration of the sleep interval is the duration of a long preamble less the sum of two times the preamble detection interval plus the preamble processing interval. Phase lock loop (PLL) power is applied a PLL settling time prior to and during the preamble detection interval.

Abstract: An IoT device has a public device identifier and a private device identifier, where the public device identifier is publicly available and the private device identifier is secret but kept in a secure device database as a correspondence. A registration request is sent from the IoT device to an association server in communication with the device database having an association between IoT public identifier and a corresponding IoT private identifier. The association server which receives the registration request responds with a registration acknowledgement containing, in encrypted form, the private device identifier of the original request and, optionally, the public device identifier associated with the registration request. The requesting IoT device receives the association acknowledgement, decrypts the private device identifier, compares it to its own device identifier, and if they match, sends one or more association requests.

Abstract: A preamble detector for Bluetooth Low Energy includes a receiver for receiving Bluetooth packets and an energy detect controller for enabling power to the receiver during T1 and disabling power to the receiver during T2 in a cyclical fashion until an packet energy increase is detected followed by detection of a preamble. During the T1 interval an AGC process is operative which is also searching for an increase in energy from sample to sample within the same T1 interval, or across adjacent T1 intervals. If an energy increase is detected, a preamble detector is operative to determine if a preamble is present, and if the preamble is not present, the process resumes cycling through T1 and T2.

Abstract: A wireless receiver powers up shortly before the expected arrival of a beacon frame, and upon detection of a beacon frame from an access point the station is associated with and determination of subsequent fields of interest, including at least a TIM field, the receiver powers down. At the previously identified fields of interest, the receiver powers up and uses previously stored values to continue packet demodulation, thereafter examining the TIM field to determine whether the AP has packets to transmit to the station.

Abstract: A preamble detector for a Bluetooth Long Range includes a receiver for forming baseband samples from Bluetooth packets and a preamble detect controller for enabling and disabling power to the receiver. Where the preamble duration is Tcyc, the preamble detector turns on for a preamble detect time T1 and turns off for a duration T2, where T2=Tcyc?2*T1. A series of hierarchical decisions is made on sequentially increasing intervals of time based on an accumulated correlation result of correlating the baseband samples against a SYNC sequence to power the receiver back down before the end of the T1 period when the accumulated correlation result is below a threshold and continues to a subsequent correlation interval when the accumulated correlation result is above a threshold, where the threshold is established to have at least a 20% false alarm rate for preamble detection.

Abstract: A mesh receiver has a wakeup receiver for reception of a wakeup sequence formed by keyed RF or a sequence of wireless packets and gaps, a transmitter forming low speed RF wakeup sequence to other mesh stations, a mesh receiver for reception of high speed WLAN packets, the transmitter sending a wireless ACK packet in response to a wakeup sequence, the mesh receiver thereafter receiving wireless packets from a remote station, the mesh transmitter sending an ACK, the mesh station thereafter identifying a next hop station, and sending a wakeup sequence to that station, after receipt of an ACK, sending the data, the mesh receiver and mesh transmitter thereafter going to sleep.

Abstract: A periodic output generator has a first clock source coupled to a first counter and a second clock source with a frequency greater than the first clock source, the second clock source coupled to a second counter, the first clock source operating continuously, the second clock source enabled when the first clock source reaches a count C1. The second clock source generates an output when a count C2 is reached, and the counters are reset and the process repeats. In another example, a timestamp generator has a high speed clock and a real time clock operative on a low speed clock. The timestamp generator receives an external event, turns on the high speed clock generator and counts high speed clock cycles C until the arrival of the next time stamp, and computes an event timestamp as the next timestamp less c/f, less the startup time of the high speed clock.

Abstract: A mesh receiver has a wakeup receiver for reception of a wakeup sequence formed by keyed RF or a sequence of wireless packets and gaps, a transmitter forming low speed RF wakeup sequence to other mesh stations, a mesh receiver for reception of high speed WLAN packets, the transmitter sending a wireless ACK packet in response to a wakeup sequence, the mesh receiver thereafter receiving wireless packets from a remote station, the mesh transmitter sending an ACK, the mesh station thereafter identifying a next hop station, and sending a wakeup sequence to that station, after receipt of an ACK, sending the data, the mesh receiver and mesh transmitter thereafter going to sleep.

Abstract: A wireless receiver has a preamble detection apparatus and method which waits until the expected arrival of a beacon frame, after which power is cyclically applied during a preamble detection interval and a sleep interval until a preamble is detected. The preamble detector has a first mode with a longer preamble detection interval and a second mode with a shorter preamble detection interval. During the preamble detection interval, power is applied to receiver components, and during the sleep interval, power is not applied. The duration of the preamble detection interval is equal to a preamble sensing interval, and if a preamble is detected, power remains applied to a preamble processor for a preamble processing interval. The duration of the sleep interval is the duration of a long preamble less the sum of two times the preamble detection interval plus the preamble processing interval. Phase lock loop (PLL) power is applied a PLL settling time prior to and during the preamble detection interval.

Abstract: A flash memory controller is operative to receive serial commands and command arguments. A flash permissions table identifies each segment of flash memory as READ_ONLY, PRIVATE_R/W or OPEN_R/W. A memory interface is coupled to a flash memory and also the flash permissions table. When a flash memory write operation is received with an associated command argument corresponding to an address indicated as READ_ONLY in the flash permissions table and a DISABLE_WR_REG is true, the write operation is ignored or converted into a non-write command and issued to the flash memory.

Abstract: An IoT device has a public device identifier and a private device identifier, where the public device identifier is publicly available and the private device identifier is secret but kept in a secure device database as a correspondence. A registration request is sent from the IoT device to an association server in communication with the device database having an association between IoT public identifier and a corresponding IoT private identifier. The association server which receives the registration request responds with a registration acknowledgement containing, in encrypted form, the private device identifier of the original request and, optionally, the public device identifier associated with the registration request. The requesting IoT device receives the association acknowledgement, decrypts the private device identifier, compares it to its own device identifier, and if they match, sends one or more association requests.

Abstract: A wireless receiver has a preamble detection apparatus and method which waits until the expected arrival of a beacon frame, after which power is cyclically applied during a preamble detection interval and a sleep interval until a preamble is detected. The preamble detector has a first mode with a longer preamble detection interval and a second mode with a shorter preamble detection interval. During the preamble detection interval, power is applied to receiver components, and during the sleep interval, power is not applied. The duration of the preamble detection interval is equal to a preamble sensing interval, and if a preamble is detected, power remains applied to a preamble processor for a preamble processing interval. The duration of the sleep interval is the duration of a long preamble less the sum of two times the preamble detection interval plus the preamble processing interval. Phase lock loop (PLL) power is applied a PLL settling time prior to and during the preamble detection interval.

Abstract: A printed circuit antenna has a feedline region and a radiating structure region. The feedline region is formed of conductors on an upper plane, the conductors including a feedline which is edge coupled to a left ground structure and a right ground structure, all of which are above a ground plane. Upper highband RF is coupled from the RF feedline to a first segment, a second segment, and a third segment. For lowband RF frequencies, RF is coupled from the feedline to the first segment and stub, across a gap to a fourth segment, a fifth segment LB radiating structure, a fifth segment common radiating structure, and to a sixth segment common radiating structure which is grounded. For lower highband RF frequencies, RF is coupled from the feedline to the first segment and stub to a sixth segment common radiating structure, fifth segment, bridge, seventh segment, and eighth segment.

Abstract: A system for transmission of incident information includes maintaining a table of RSSI values for a plurality of stations. When an incident is detected, the system first sends a broadcast packet with incident information, and next sends a unicast packet to any station below a particular RSSI threshold until the unicast packet is acknowledged or a retransmission interval passes.

Abstract: A wake-up processor for a communications processor has a receive signal amplifier for amplifying the signal level of received RF which has been transmitted as wireless local area network WLAN packets, an amplitude detector for indicating the envelope of the RF energy in the packets, a threshold detector which thresholds the detected RF envelope, and a correlator which compares the detected and thresholded RF envelope with a private pseudo-random number to determine the level of correlation between the received value and the private value. When the correlation exceeds a required threshold, a wake-up signal is asserted which is used to bring a WLAN processor into an active state for processing of subsequently sent packets.