Adaptive sleeping and awakening protocol for an energy-efficient adhoc network

• US 7,356,561 B2
• Filed: 05/01/2003
• Issued: 04/08/2008
• Est. Priority Date: 05/01/2003
• Status: Expired due to Fees

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Lau, Wing Cheong, Kang, Joseph H., Balachandran, Krishna
• Primary Examiner(s): DINH, KHANH Q
• Application Number:
  US10/426,691
• Publication Number:
  US 20040230638A1
• Time in Patent Office: 1,804 Days
• Field of Search: 709/224, 709/228, 709/207, 709/220, 709/203, 709/227, 370/338, 370/347, 370/310, 370/356, 375/134, 455/574
• US Class Current: 709/203
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 52/0277 according to available power supply, e.g. switching off when a low battery condition is detected
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a multiple node network, the method includes waking up at least one node from a sleep mode during at least one associated slot of a time-slotted frame, the sleep mode being a low power consumption mode. Also, in at least one node of a multiple node network, the period of time a node sleeps is based on the residual energy of the node, the residual energy of the nodes in the neighborhood, neighborhood node density, and combinations thereof.

Claims

1. In a multiple node network, a method comprising:

receiving, at least one node, residual energies from neighboring nodes;

waking up the least one node from a sleep mode after sleeping a period of time determined based on a residual energy of the at least one node and the received residual energies for the neighboring nodes and during one or more wake-up slots of a network time-slotted frame, the sleep mode being a low power consumption mode;

receiving data, at the awakened node, from one or more neighboring nodes that may have transmitted data during one or more of the wake-up slots of the awakened node;

determining, at the awakened node, if one or more neighboring nodes belonging to one or more sleeper classes will awaken using a wake-up determination process employed by the one or more neighboring nodes and the received data, the sleeper classes including at least a short sleeper class and a long sleeper class; and

transmitting, from the awakened node, in one or more wake-up slots of the neighboring nodes, if there is data to be sent to one or more of the neighboring nodes, based on the determination of when the neighboring nodes wake up from their respective sleep modes.

2. The method of claim 1, further comprising:

determining the associated slot(s) for the at least one node to awaken in using a predetermined process.

3. The method of claim 2, wherein the predetermined process is based on an address of the at least one node.

4. The method of claim 3, further comprising:

receiving addresses of neighboring nodes at the node such that the at least one

node knows when the neighboring nodes wake up from their respective sleep modes.

5. The method of claim 4, further comprising:

waking up the at least one node from the sleep mode during a neighborhood control interval; and

wherein

the receiving step receives the addresses during the neighborhood control interval.

6. The method of claim 4, further comprising:

determining a neighboring node based on signal strengths of signals received from other nodes in the network.

7. The method of claim 4, further comprising:

directing transmission from the awakened node towards a destination based on the knowledge of when the neighboring nodes wake up from their respective sleep modes.

8. The method of claim 3, further comprising:

waking up the at least one node from the sleep mode during a neighborhood control interval; and

transmitting the address of the node during the neighborhood control interval.

9. The method of claim 1, wherein waking wakes up the at least one node after sleeping a period of time determined based on a residual energy of the at least one node.

10. The method of claim 1, wherein waking wakes up the at least one node after sleeping a period of time determined based on the residual energy of the at least one node and a density of neighboring nodes.

11. The method of claim 10, wherein waking wakes up the at least one node after sleeping a period of time determined based on the residual energy of the at least one node, the received residual energies for neighboring nodes, and the density of the neighboring nodes.