Method for communicating in a network comprising a batteryless ZigBee device, network and device therefor

A method for communicating in a network, wherein the network includes a parent-child relationship between a child-end device and its parent-end router device, the method comprising:

• the child-end device, which is power constrained, wherein the child-end device addresses all communication to its parent-end router, sending a data frame to be forwarded by an old parent-end router to a destination;
• the child-end device waiting for reception of an acknowledgment message during a predetermined time from the only parent-end router;
• sending, via the child-end device, a trigger to enable a proxy search procedure, when the acknowledgement message from the old parent-end router is not received, and wherein an identity of the parent-end router is unknown to the child-end device during said communication with the parent-end router;
• receiving, at a first parent-end router device, the trigger for the proxy search procedure;
• in response to the trigger, determining whether the first parent-end router device fulfills a condition for acting as a new parent-end router for the child-end device in place of the old parent-end router;
• and
• appointing the first parent-end router device as the new parent-end router for the child-end device when the first parent-end router device fulfills the condition.

A system for communicating in a network, wherein the network includes a parent-child relationship between a child-end device and its parent-end router device, the system comprising:

• the parent-end router device having,
• a wireless receiver configured to receive a data frame and a command frame from its child-end device, wherein the child-end device addresses all communication to its parent-end router for forwarding to a final destination, and wherein an identity of the parent-end router is unknown to the child-end device during said communication with the parent-end router, a wireless transmitter configured to transmit an acknowledgment message and a resolution message, in response to a proxy search request trigger, such that the parent-end router device replaces another parent-end router device;
• a transmitter configured to forward a child-end device message, in response to the proxy search request trigger;
• a comparator configured to compare an address of the parent-end router device with an address of at least one child-end device, in response to the proxy search request trigger;
• and
• a memory configured to store a neighbor table, wherein the table comprises a list of child-end devices and a status of a relationship between the parent-end router device and each child-end device;
• wherein the at least one child-end device has limited energy resources and includes a wireless transmitter configured to send the trigger for the proxy search procedure, a wireless receiver configured to receive at least an acknowledgement message and a processor configured to track the acknowledgement message and trigger the proxy search procedure.

A method for wireless communication in a network, wherein the network includes a parent-child relationship between a child-end device and its parent-end router device, the method comprising:

• sending, via the child-end device which is batteryless, all communication to the parent-end router for forwarding to a final destination, wherein the child-end device does not know the identity of the parent-end router during said communication;
• when an acknowledgement message from an old parent-end router configured to relay communication between the child-end device and the network is not received during said communication, sending a trigger to enable a proxy search procedure;
• receiving, at a first parent-end router device, the trigger for the proxy search procedure,
• in response to the trigger for the proxy search procedure, determining whether the first parent-end router device fulfills a condition for acting as a new proxy router for the child-end device in place of the old parent-end router;
• appointing the first router device as the new parent-end router for the child-end device when the first parent-end router device fulfills the condition.