Adjustable carrier sense threshold for wireless broadcast

Patent metadata

Field	Value
Publication number	US-9288709-B2
Application number	US-201313763680-A
Country	US
Kind code	B2
Filing date	Feb 10, 2013
Priority date	Feb 10, 2013
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

A method of adjusting a carrier sense threshold to avoid hidden nodes during wireless broadcast. The method includes monitoring a load of the peer-to-peer network before broadcasting a message from a node. The method also includes adjusting a carrier sense threshold (CST) based on the load of the peer-to-peer network to avoid broadcast message collisions due to one or more hidden nodes.

First claim

What is claimed is:

1. A method of wireless communication in a peer-to-peer network, comprising:
monitoring a load of the peer-to-peer network before broadcasting a message from a node; and
adjusting a carrier sense threshold (CST) based on the load of the peer-to-peer network before broadcasting the message, to avoid broadcast message collisions due to one or more hidden nodes, wherein the adjusting comprises—
lowering the CST to increase a carrier sense range if the load of the peer-to-peer network increases, and
increasing the CST to decrease the carrier sense range if the load of the peer-to-peer network decreases.

2. The method of claim 1 , in which the load of the peer-to-peer network comprises an amount of broadcast activity from neighbor nodes.

3. The method of claim 2 , in which monitoring the load of the peer-to-peer network comprises counting successfully received messages from the neighbor nodes.

4. The method of claim 2 , in which monitoring the load of the peer-to-peer network comprises counting a percentage of time a channel is busy.

5. The method of claim 4 , in which the channel is determined to be busy when a noise level on the channel exceeds a current CST.

6. An apparatus for wireless communication in a peer-to-peer network, comprising:
means for monitoring a load of the peer-to-peer network before broadcasting a message from a node; and
means for adjusting a carrier sense threshold (CST) based on the load of the peer-to-peer network before broadcasting the message, to avoid broadcast message collisions due to one or more hidden nodes,
wherein the means for adjusting comprises:
means for lowering the CST to increase a carrier sense range when the load of the peer-to-peer network increases, and
means for increasing the CST to decrease the carrier sense range when the load of the peer-to-peer network decreases.

7. An apparatus for wireless communication in a peer-to-peer network, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
monitor a load of the peer-to-peer network before broadcasting a message from a node; and
adjust a carrier sense threshold (CST) based on the load of the peer-to-peer network before broadcasting the message, to avoid broadcast message collisions due to one or more hidden nodes,
wherein the at least one processor is configured to adjust the CST by being configured to:
lower the CST to increase a carrier sense range when the load of the peer-to-peer network increases, and
increase the CST to decrease the carrier sense range when the load of the peer-to-peer network decreases.

8. The apparatus of claim 7 , in which the load of the peer-to-peer network comprises an amount of broadcast activity from neighbor nodes.

9. The apparatus of claim 8 , in which the at least one processor is further configured to monitor the load of the peer-to-peer network by counting successfully received messages from the neighbor nodes.

10. The apparatus of claim 8 , in which the at least one processor is further configured to monitor the load of the peer-to-peer network by counting a percentage of time a channel is busy.

11. The apparatus of claim 10 , in which the at least one processor is further configured to determine that the channel is busy when a noise level on the channel exceeds a current CST.

12. A non-transitory computer-readable medium storing computer executable code for wireless communication, comprising code for:
monitoring a load of a peer-to-peer network before broadcasting a message from a node; and
adjusting a carrier sense threshold (CST) based on the load of the peer-to-peer network before broadcasting the message, to avoid broadcast message collisions due to one or more hidden nodes,
wherein the code for adjusting the CST comprises code for:
lowering the CST to increase a carrier sense range when the load of the peer-to-peer network increases, and
increasing the CST to decrease the carrier sense range when the load of the peer-to-peer network decreases.

Assignees

• Qualcomm Inc

Inventors

• Ding Gang
• Chikkappa Kiran S
• Lundqvist Patrik N
• Malik Rahul

Classifications

• H04W74/0808 Primary

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W28/0231 Primary

  based on communication conditions (dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54) · CPC title