Patent ID: 8811188
Filing Date: 2014-08-19
Classification: G06F,H04L,H04W,Y02D

Abstract:
1. A method of reprogramming for a wireless sensor network using a three-way handshake protocol for transfer of new code from an originator of new code to a plurality of sensor nodes in the network, said handshake protocol including advertising, request and data transfer messages, said method comprising: segmenting said new code into multiple pages each split into multiple packets; performing a three-way handshake in units of a page, transmitting each page of said new code in units of a packet; and enabling each node to receive pages of said new code out of order from multiple sources; propagating a warning message containing information about the nature of new code to be transmitted, said warning message including network topology information indicative of the routing of the warning message from the originator; at each node which receives the warning message, estimating the propagation time from the originator based on the network topology information contained in said warning message and, based on the propagation time length, conditionally disabling RF circuitry to reduce power consumption during a corresponding sleep period; each node updating the network topology information indicative of the routing of said warning message and forwarding the updated warning message to other nodes in the network; and each node waking up at the end of said sleep period and initiating a three-way handshake protocol for transfer of code, said node receiving advertising messages from other nodes relating to new code, sending request messages for needed code, receiving needed code, and sending advertising messages to other nodes in the network relating to received code.